drivers/power/supply/ab8500_charger.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Charger driver for AB8500
   5  *
   6  * License Terms: GNU General Public License v2
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/notifier.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/completion.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/err.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/kobject.h>
  27 #include <linux/of.h>
  28 #include <linux/mfd/core.h>
  29 #include <linux/mfd/abx500/ab8500.h>
  30 #include <linux/mfd/abx500.h>
  31 #include <linux/mfd/abx500/ab8500-bm.h>
  32 #include <linux/mfd/abx500/ab8500-gpadc.h>
  33 #include <linux/mfd/abx500/ux500_chargalg.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/mutex.h>
  36
  37 /* Charger constants */
  38 #define NO_PW_CONN                      0
  39 #define AC_PW_CONN                      1
  40 #define USB_PW_CONN                     2
  41
  42 #define MAIN_WDOG_ENA                   0x01
  43 #define MAIN_WDOG_KICK                  0x02
  44 #define MAIN_WDOG_DIS                   0x00
  45 #define CHARG_WD_KICK                   0x01
  46 #define MAIN_CH_ENA                     0x01
  47 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  48 #define USB_CH_ENA                      0x01
  49 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  50 #define MAIN_CH_DET                     0x01
  51 #define MAIN_CH_CV_ON                   0x04
  52 #define USB_CH_CV_ON                    0x08
  53 #define VBUS_DET_DBNC100                0x02
  54 #define VBUS_DET_DBNC1                  0x01
  55 #define OTP_ENABLE_WD                   0x01
  56 #define DROP_COUNT_RESET                0x01
  57 #define USB_CH_DET                      0x01
  58
  59 #define MAIN_CH_INPUT_CURR_SHIFT        4
  60 #define VBUS_IN_CURR_LIM_SHIFT          4
  61 #define AB8540_VBUS_IN_CURR_LIM_SHIFT   2
  62 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
  63 #define AB8540_AUTO_VBUS_IN_CURR_MASK   0x3F
  64 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
  65
  66 #define LED_INDICATOR_PWM_ENA           0x01
  67 #define LED_INDICATOR_PWM_DIS           0x00
  68 #define LED_IND_CUR_5MA                 0x04
  69 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  70
  71 /* HW failure constants */
  72 #define MAIN_CH_TH_PROT                 0x02
  73 #define VBUS_CH_NOK                     0x08
  74 #define USB_CH_TH_PROT                  0x02
  75 #define VBUS_OVV_TH                     0x01
  76 #define MAIN_CH_NOK                     0x01
  77 #define VBUS_DET                        0x80
  78
  79 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
  80 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
  81 #define USB_CH_VBUSDROP                         0x40
  82 #define USB_CH_VBUSDETDBNC                      0x01
  83
  84 /* UsbLineStatus register bit masks */
  85 #define AB8500_USB_LINK_STATUS          0x78
  86 #define AB8505_USB_LINK_STATUS          0xF8
  87 #define AB8500_STD_HOST_SUSP            0x18
  88 #define USB_LINK_STATUS_SHIFT           3
  89
  90 /* Watchdog timeout constant */
  91 #define WD_TIMER                        0x30 /* 4min */
  92 #define WD_KICK_INTERVAL                (60 * HZ)
  93
  94 /* Lowest charger voltage is 3.39V -> 0x4E */
  95 #define LOW_VOLT_REG                    0x4E
  96
  97 /* Step up/down delay in us */
  98 #define STEP_UDELAY                     1000
  99
 100 #define CHARGER_STATUS_POLL 10 /* in ms */
 101
 102 #define CHG_WD_INTERVAL                 (60 * HZ)
 103
 104 #define AB8500_SW_CONTROL_FALLBACK      0x03
 105 /* Wait for enumeration before charing in us */
 106 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
 107 /*External charger control*/
 108 #define AB8500_SYS_CHARGER_CONTROL_REG          0x52
 109 #define EXTERNAL_CHARGER_DISABLE_REG_VAL        0x03
 110 #define EXTERNAL_CHARGER_ENABLE_REG_VAL         0x07
 111
 112 /* UsbLineStatus register - usb types */
 113 enum ab8500_charger_link_status {
 114         USB_STAT_NOT_CONFIGURED,
 115         USB_STAT_STD_HOST_NC,
 116         USB_STAT_STD_HOST_C_NS,
 117         USB_STAT_STD_HOST_C_S,
 118         USB_STAT_HOST_CHG_NM,
 119         USB_STAT_HOST_CHG_HS,
 120         USB_STAT_HOST_CHG_HS_CHIRP,
 121         USB_STAT_DEDICATED_CHG,
 122         USB_STAT_ACA_RID_A,
 123         USB_STAT_ACA_RID_B,
 124         USB_STAT_ACA_RID_C_NM,
 125         USB_STAT_ACA_RID_C_HS,
 126         USB_STAT_ACA_RID_C_HS_CHIRP,
 127         USB_STAT_HM_IDGND,
 128         USB_STAT_RESERVED,
 129         USB_STAT_NOT_VALID_LINK,
 130         USB_STAT_PHY_EN,
 131         USB_STAT_SUP_NO_IDGND_VBUS,
 132         USB_STAT_SUP_IDGND_VBUS,
 133         USB_STAT_CHARGER_LINE_1,
 134         USB_STAT_CARKIT_1,
 135         USB_STAT_CARKIT_2,
 136         USB_STAT_ACA_DOCK_CHARGER,
 137 };
 138
 139 enum ab8500_usb_state {
 140         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 141         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 142         AB8500_BM_USB_STATE_CONFIGURED,
 143         AB8500_BM_USB_STATE_SUSPEND,
 144         AB8500_BM_USB_STATE_RESUME,
 145         AB8500_BM_USB_STATE_MAX,
 146 };
 147
 148 /* VBUS input current limits supported in AB8500 in mA */
 149 #define USB_CH_IP_CUR_LVL_0P05          50
 150 #define USB_CH_IP_CUR_LVL_0P09          98
 151 #define USB_CH_IP_CUR_LVL_0P19          193
 152 #define USB_CH_IP_CUR_LVL_0P29          290
 153 #define USB_CH_IP_CUR_LVL_0P38          380
 154 #define USB_CH_IP_CUR_LVL_0P45          450
 155 #define USB_CH_IP_CUR_LVL_0P5           500
 156 #define USB_CH_IP_CUR_LVL_0P6           600
 157 #define USB_CH_IP_CUR_LVL_0P7           700
 158 #define USB_CH_IP_CUR_LVL_0P8           800
 159 #define USB_CH_IP_CUR_LVL_0P9           900
 160 #define USB_CH_IP_CUR_LVL_1P0           1000
 161 #define USB_CH_IP_CUR_LVL_1P1           1100
 162 #define USB_CH_IP_CUR_LVL_1P3           1300
 163 #define USB_CH_IP_CUR_LVL_1P4           1400
 164 #define USB_CH_IP_CUR_LVL_1P5           1500
 165
 166 #define VBAT_TRESH_IP_CUR_RED           3800
 167
 168 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 169         struct ab8500_charger, usb_chg)
 170 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 171         struct ab8500_charger, ac_chg)
 172
 173 /**
 174  * struct ab8500_charger_interrupts - ab8500 interupts
 175  * @name:       name of the interrupt
 176  * @isr         function pointer to the isr
 177  */
 178 struct ab8500_charger_interrupts {
 179         char *name;
 180         irqreturn_t (*isr)(int irq, void *data);
 181 };
 182
 183 struct ab8500_charger_info {
 184         int charger_connected;
 185         int charger_online;
 186         int charger_voltage;
 187         int cv_active;
 188         bool wd_expired;
 189         int charger_current;
 190 };
 191
 192 struct ab8500_charger_event_flags {
 193         bool mainextchnotok;
 194         bool main_thermal_prot;
 195         bool usb_thermal_prot;
 196         bool vbus_ovv;
 197         bool usbchargernotok;
 198         bool chgwdexp;
 199         bool vbus_collapse;
 200         bool vbus_drop_end;
 201 };
 202
 203 struct ab8500_charger_usb_state {
 204         int usb_current;
 205         int usb_current_tmp;
 206         enum ab8500_usb_state state;
 207         enum ab8500_usb_state state_tmp;
 208         spinlock_t usb_lock;
 209 };
 210
 211 struct ab8500_charger_max_usb_in_curr {
 212         int usb_type_max;
 213         int set_max;
 214         int calculated_max;
 215 };
 216
 217 /**
 218  * struct ab8500_charger - ab8500 Charger device information
 219  * @dev:                Pointer to the structure device
 220  * @vbus_detected:      VBUS detected
 221  * @vbus_detected_start:
 222  *                      VBUS detected during startup
 223  * @ac_conn:            This will be true when the AC charger has been plugged
 224  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 225  *                      charger is enabled
 226  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 227  *                      charger is enabled
 228  * @vbat                Battery voltage
 229  * @old_vbat            Previously measured battery voltage
 230  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
 231  * @autopower           Indicate if we should have automatic pwron after pwrloss
 232  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 233  * @invalid_charger_detect_state State when forcing AB to use invalid charger
 234  * @is_aca_rid:         Incicate if accessory is ACA type
 235  * @current_stepping_sessions:
 236  *                      Counter for current stepping sessions
 237  * @parent:             Pointer to the struct ab8500
 238  * @gpadc:              Pointer to the struct gpadc
 239  * @bm:                 Platform specific battery management information
 240  * @flags:              Structure for information about events triggered
 241  * @usb_state:          Structure for usb stack information
 242  * @max_usb_in_curr:    Max USB charger input current
 243  * @ac_chg:             AC charger power supply
 244  * @usb_chg:            USB charger power supply
 245  * @ac:                 Structure that holds the AC charger properties
 246  * @usb:                Structure that holds the USB charger properties
 247  * @regu:               Pointer to the struct regulator
 248  * @charger_wq:         Work queue for the IRQs and checking HW state
 249  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
 250  * @pm_lock:            Lock to prevent system to suspend
 251  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 252  * @check_hw_failure_work:      Work for checking HW state
 253  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 254  * @kick_wd_work:               Work for kicking the charger watchdog in case
 255  *                              of ABB rev 1.* due to the watchog logic bug
 256  * @ac_charger_attached_work:   Work for checking if AC charger is still
 257  *                              connected
 258  * @usb_charger_attached_work:  Work for checking if USB charger is still
 259  *                              connected
 260  * @ac_work:                    Work for checking AC charger connection
 261  * @detect_usb_type_work:       Work for detecting the USB type connected
 262  * @usb_link_status_work:       Work for checking the new USB link status
 263  * @usb_state_changed_work:     Work for checking USB state
 264  * @attach_work:                Work for detecting USB type
 265  * @vbus_drop_end_work:         Work for detecting VBUS drop end
 266  * @check_main_thermal_prot_work:
 267  *                              Work for checking Main thermal status
 268  * @check_usb_thermal_prot_work:
 269  *                              Work for checking USB thermal status
 270  * @charger_attached_mutex:     For controlling the wakelock
 271  */
 272 struct ab8500_charger {
 273         struct device *dev;
 274         bool vbus_detected;
 275         bool vbus_detected_start;
 276         bool ac_conn;
 277         bool vddadc_en_ac;
 278         bool vddadc_en_usb;
 279         int vbat;
 280         int old_vbat;
 281         bool usb_device_is_unrecognised;
 282         bool autopower;
 283         bool autopower_cfg;
 284         int invalid_charger_detect_state;
 285         int is_aca_rid;
 286         atomic_t current_stepping_sessions;
 287         struct ab8500 *parent;
 288         struct ab8500_gpadc *gpadc;
 289         struct abx500_bm_data *bm;
 290         struct ab8500_charger_event_flags flags;
 291         struct ab8500_charger_usb_state usb_state;
 292         struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
 293         struct ux500_charger ac_chg;
 294         struct ux500_charger usb_chg;
 295         struct ab8500_charger_info ac;
 296         struct ab8500_charger_info usb;
 297         struct regulator *regu;
 298         struct workqueue_struct *charger_wq;
 299         struct mutex usb_ipt_crnt_lock;
 300         struct delayed_work check_vbat_work;
 301         struct delayed_work check_hw_failure_work;
 302         struct delayed_work check_usbchgnotok_work;
 303         struct delayed_work kick_wd_work;
 304         struct delayed_work usb_state_changed_work;
 305         struct delayed_work attach_work;
 306         struct delayed_work ac_charger_attached_work;
 307         struct delayed_work usb_charger_attached_work;
 308         struct delayed_work vbus_drop_end_work;
 309         struct work_struct ac_work;
 310         struct work_struct detect_usb_type_work;
 311         struct work_struct usb_link_status_work;
 312         struct work_struct check_main_thermal_prot_work;
 313         struct work_struct check_usb_thermal_prot_work;
 314         struct usb_phy *usb_phy;
 315         struct notifier_block nb;
 316         struct mutex charger_attached_mutex;
 317 };
 318
 319 /* AC properties */
 320 static enum power_supply_property ab8500_charger_ac_props[] = {
 321         POWER_SUPPLY_PROP_HEALTH,
 322         POWER_SUPPLY_PROP_PRESENT,
 323         POWER_SUPPLY_PROP_ONLINE,
 324         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 325         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 326         POWER_SUPPLY_PROP_CURRENT_NOW,
 327 };
 328
 329 /* USB properties */
 330 static enum power_supply_property ab8500_charger_usb_props[] = {
 331         POWER_SUPPLY_PROP_HEALTH,
 332         POWER_SUPPLY_PROP_CURRENT_AVG,
 333         POWER_SUPPLY_PROP_PRESENT,
 334         POWER_SUPPLY_PROP_ONLINE,
 335         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 336         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 337         POWER_SUPPLY_PROP_CURRENT_NOW,
 338 };
 339
 340 /*
 341  * Function for enabling and disabling sw fallback mode
 342  * should always be disabled when no charger is connected.
 343  */
 344 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 345                 bool fallback)
 346 {
 347         u8 val;
 348         u8 reg;
 349         u8 bank;
 350         u8 bit;
 351         int ret;
 352
 353         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 354
 355         if (is_ab8500(di->parent)) {
 356                 bank = 0x15;
 357                 reg = 0x0;
 358                 bit = 3;
 359         } else {
 360                 bank = AB8500_SYS_CTRL1_BLOCK;
 361                 reg = AB8500_SW_CONTROL_FALLBACK;
 362                 bit = 0;
 363         }
 364
 365         /* read the register containing fallback bit */
 366         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
 367         if (ret < 0) {
 368                 dev_err(di->dev, "%d read failed\n", __LINE__);
 369                 return;
 370         }
 371
 372         if (is_ab8500(di->parent)) {
 373                 /* enable the OPT emulation registers */
 374                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 375                 if (ret) {
 376                         dev_err(di->dev, "%d write failed\n", __LINE__);
 377                         goto disable_otp;
 378                 }
 379         }
 380
 381         if (fallback)
 382                 val |= (1 << bit);
 383         else
 384                 val &= ~(1 << bit);
 385
 386         /* write back the changed fallback bit value to register */
 387         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
 388         if (ret) {
 389                 dev_err(di->dev, "%d write failed\n", __LINE__);
 390         }
 391
 392 disable_otp:
 393         if (is_ab8500(di->parent)) {
 394                 /* disable the set OTP registers again */
 395                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 396                 if (ret) {
 397                         dev_err(di->dev, "%d write failed\n", __LINE__);
 398                 }
 399         }
 400 }
 401
 402 /**
 403  * ab8500_power_supply_changed - a wrapper with local extentions for
 404  * power_supply_changed
 405  * @di:   pointer to the ab8500_charger structure
 406  * @psy:  pointer to power_supply_that have changed.
 407  *
 408  */
 409 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 410                                         struct power_supply *psy)
 411 {
 412         /*
 413          * This happens if we get notifications or interrupts and
 414          * the platform has been configured not to support one or
 415          * other type of charging.
 416          */
 417         if (!psy)
 418                 return;
 419
 420         if (di->autopower_cfg) {
 421                 if (!di->usb.charger_connected &&
 422                     !di->ac.charger_connected &&
 423                     di->autopower) {
 424                         di->autopower = false;
 425                         ab8500_enable_disable_sw_fallback(di, false);
 426                 } else if (!di->autopower &&
 427                            (di->ac.charger_connected ||
 428                             di->usb.charger_connected)) {
 429                         di->autopower = true;
 430                         ab8500_enable_disable_sw_fallback(di, true);
 431                 }
 432         }
 433         power_supply_changed(psy);
 434 }
 435
 436 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 437         bool connected)
 438 {
 439         if (connected != di->usb.charger_connected) {
 440                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 441                 di->usb.charger_connected = connected;
 442
 443                 if (!connected)
 444                         di->flags.vbus_drop_end = false;
 445
 446                 /*
 447                  * Sometimes the platform is configured not to support
 448                  * USB charging and no psy has been created, but we still
 449                  * will get these notifications.
 450                  */
 451                 if (di->usb_chg.psy) {
 452                         sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL,
 453                                      "present");
 454                 }
 455
 456                 if (connected) {
 457                         mutex_lock(&di->charger_attached_mutex);
 458                         mutex_unlock(&di->charger_attached_mutex);
 459
 460                         if (is_ab8500(di->parent))
 461                                 queue_delayed_work(di->charger_wq,
 462                                            &di->usb_charger_attached_work,
 463                                            HZ);
 464                 } else {
 465                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
 466                         mutex_lock(&di->charger_attached_mutex);
 467                         mutex_unlock(&di->charger_attached_mutex);
 468                 }
 469         }
 470 }
 471
 472 /**
 473  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 474  * @di:         pointer to the ab8500_charger structure
 475  *
 476  * Returns ac charger voltage (on success)
 477  */
 478 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 479 {
 480         int vch;
 481
 482         /* Only measure voltage if the charger is connected */
 483         if (di->ac.charger_connected) {
 484                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 485                 if (vch < 0)
 486                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 487         } else {
 488                 vch = 0;
 489         }
 490         return vch;
 491 }
 492
 493 /**
 494  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 495  * @di:         pointer to the ab8500_charger structure
 496  *
 497  * Returns ac charger CV mode (on success) else error code
 498  */
 499 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 500 {
 501         u8 val;
 502         int ret = 0;
 503
 504         /* Only check CV mode if the charger is online */
 505         if (di->ac.charger_online) {
 506                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 507                         AB8500_CH_STATUS1_REG, &val);
 508                 if (ret < 0) {
 509                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 510                         return 0;
 511                 }
 512
 513                 if (val & MAIN_CH_CV_ON)
 514                         ret = 1;
 515                 else
 516                         ret = 0;
 517         }
 518
 519         return ret;
 520 }
 521
 522 /**
 523  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 524  * @di:         pointer to the ab8500_charger structure
 525  *
 526  * This function returns the vbus voltage.
 527  * Returns vbus voltage (on success)
 528  */
 529 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 530 {
 531         int vch;
 532
 533         /* Only measure voltage if the charger is connected */
 534         if (di->usb.charger_connected) {
 535                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 536                 if (vch < 0)
 537                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 538         } else {
 539                 vch = 0;
 540         }
 541         return vch;
 542 }
 543
 544 /**
 545  * ab8500_charger_get_usb_current() - get usb charger current
 546  * @di:         pointer to the ab8500_charger structure
 547  *
 548  * This function returns the usb charger current.
 549  * Returns usb current (on success) and error code on failure
 550  */
 551 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 552 {
 553         int ich;
 554
 555         /* Only measure current if the charger is online */
 556         if (di->usb.charger_online) {
 557                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 558                 if (ich < 0)
 559                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 560         } else {
 561                 ich = 0;
 562         }
 563         return ich;
 564 }
 565
 566 /**
 567  * ab8500_charger_get_ac_current() - get ac charger current
 568  * @di:         pointer to the ab8500_charger structure
 569  *
 570  * This function returns the ac charger current.
 571  * Returns ac current (on success) and error code on failure.
 572  */
 573 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 574 {
 575         int ich;
 576
 577         /* Only measure current if the charger is online */
 578         if (di->ac.charger_online) {
 579                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 580                 if (ich < 0)
 581                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 582         } else {
 583                 ich = 0;
 584         }
 585         return ich;
 586 }
 587
 588 /**
 589  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 590  * @di:         pointer to the ab8500_charger structure
 591  *
 592  * Returns ac charger CV mode (on success) else error code
 593  */
 594 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 595 {
 596         int ret;
 597         u8 val;
 598
 599         /* Only check CV mode if the charger is online */
 600         if (di->usb.charger_online) {
 601                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 602                         AB8500_CH_USBCH_STAT1_REG, &val);
 603                 if (ret < 0) {
 604                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 605                         return 0;
 606                 }
 607
 608                 if (val & USB_CH_CV_ON)
 609                         ret = 1;
 610                 else
 611                         ret = 0;
 612         } else {
 613                 ret = 0;
 614         }
 615
 616         return ret;
 617 }
 618
 619 /**
 620  * ab8500_charger_detect_chargers() - Detect the connected chargers
 621  * @di:         pointer to the ab8500_charger structure
 622  * @probe:      if probe, don't delay and wait for HW
 623  *
 624  * Returns the type of charger connected.
 625  * For USB it will not mean we can actually charge from it
 626  * but that there is a USB cable connected that we have to
 627  * identify. This is used during startup when we don't get
 628  * interrupts of the charger detection
 629  *
 630  * Returns an integer value, that means,
 631  * NO_PW_CONN  no power supply is connected
 632  * AC_PW_CONN  if the AC power supply is connected
 633  * USB_PW_CONN  if the USB power supply is connected
 634  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 635  */
 636 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
 637 {
 638         int result = NO_PW_CONN;
 639         int ret;
 640         u8 val;
 641
 642         /* Check for AC charger */
 643         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 644                 AB8500_CH_STATUS1_REG, &val);
 645         if (ret < 0) {
 646                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 647                 return ret;
 648         }
 649
 650         if (val & MAIN_CH_DET)
 651                 result = AC_PW_CONN;
 652
 653         /* Check for USB charger */
 654
 655         if (!probe) {
 656                 /*
 657                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
 658                  * when disconnecting ACA even though no
 659                  * charger was connected. Try waiting a little
 660                  * longer than the 100 ms of VBUS_DET_DBNC100...
 661                  */
 662                 msleep(110);
 663         }
 664         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 665                 AB8500_CH_USBCH_STAT1_REG, &val);
 666         if (ret < 0) {
 667                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 668                 return ret;
 669         }
 670         dev_dbg(di->dev,
 671                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
 672                 val);
 673         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 674                 result |= USB_PW_CONN;
 675
 676         return result;
 677 }
 678
 679 /**
 680  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 681  * @di:                 pointer to the ab8500_charger structure
 682  * @link_status:        the identified USB type
 683  *
 684  * Get the maximum current that is allowed to be drawn from the host
 685  * based on the USB type.
 686  * Returns error code in case of failure else 0 on success
 687  */
 688 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 689                 enum ab8500_charger_link_status link_status)
 690 {
 691         int ret = 0;
 692
 693         di->usb_device_is_unrecognised = false;
 694
 695         /*
 696          * Platform only supports USB 2.0.
 697          * This means that charging current from USB source
 698          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
 699          * should set USB_CH_IP_CUR_LVL_0P5.
 700          */
 701
 702         switch (link_status) {
 703         case USB_STAT_STD_HOST_NC:
 704         case USB_STAT_STD_HOST_C_NS:
 705         case USB_STAT_STD_HOST_C_S:
 706                 dev_dbg(di->dev, "USB Type - Standard host is "
 707                         "detected through USB driver\n");
 708                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 709                 di->is_aca_rid = 0;
 710                 break;
 711         case USB_STAT_HOST_CHG_HS_CHIRP:
 712                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 713                 di->is_aca_rid = 0;
 714                 break;
 715         case USB_STAT_HOST_CHG_HS:
 716                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 717                 di->is_aca_rid = 0;
 718                 break;
 719         case USB_STAT_ACA_RID_C_HS:
 720                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
 721                 di->is_aca_rid = 0;
 722                 break;
 723         case USB_STAT_ACA_RID_A:
 724                 /*
 725                  * Dedicated charger level minus maximum current accessory
 726                  * can consume (900mA). Closest level is 500mA
 727                  */
 728                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
 729                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 730                 di->is_aca_rid = 1;
 731                 break;
 732         case USB_STAT_ACA_RID_B:
 733                 /*
 734                  * Dedicated charger level minus 120mA (20mA for ACA and
 735                  * 100mA for potential accessory). Closest level is 1300mA
 736                  */
 737                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
 738                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 739                                 di->max_usb_in_curr.usb_type_max);
 740                 di->is_aca_rid = 1;
 741                 break;
 742         case USB_STAT_HOST_CHG_NM:
 743                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 744                 di->is_aca_rid = 0;
 745                 break;
 746         case USB_STAT_DEDICATED_CHG:
 747                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 748                 di->is_aca_rid = 0;
 749                 break;
 750         case USB_STAT_ACA_RID_C_HS_CHIRP:
 751         case USB_STAT_ACA_RID_C_NM:
 752                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 753                 di->is_aca_rid = 1;
 754                 break;
 755         case USB_STAT_NOT_CONFIGURED:
 756                 if (di->vbus_detected) {
 757                         di->usb_device_is_unrecognised = true;
 758                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
 759                         di->max_usb_in_curr.usb_type_max =
 760                                                 USB_CH_IP_CUR_LVL_1P5;
 761                         break;
 762                 }
 763         case USB_STAT_HM_IDGND:
 764                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 765                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 766                 ret = -ENXIO;
 767                 break;
 768         case USB_STAT_RESERVED:
 769                 if (is_ab8500(di->parent)) {
 770                         di->flags.vbus_collapse = true;
 771                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
 772                                                 "VBUS has collapsed\n");
 773                         ret = -ENXIO;
 774                         break;
 775                 } else {
 776                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
 777                         di->max_usb_in_curr.usb_type_max =
 778                                                 USB_CH_IP_CUR_LVL_0P05;
 779                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 780                                 link_status,
 781                                 di->max_usb_in_curr.usb_type_max);
 782                         ret = -ENXIO;
 783                         break;
 784                 }
 785         case USB_STAT_CARKIT_1:
 786         case USB_STAT_CARKIT_2:
 787         case USB_STAT_ACA_DOCK_CHARGER:
 788         case USB_STAT_CHARGER_LINE_1:
 789                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 790                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 791                                 di->max_usb_in_curr.usb_type_max);
 792                 break;
 793         case USB_STAT_NOT_VALID_LINK:
 794                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
 795                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 796                 break;
 797
 798         default:
 799                 dev_err(di->dev, "USB Type - Unknown\n");
 800                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 801                 ret = -ENXIO;
 802                 break;
 803         };
 804
 805         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
 806         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 807                 link_status, di->max_usb_in_curr.set_max);
 808
 809         return ret;
 810 }
 811
 812 /**
 813  * ab8500_charger_read_usb_type() - read the type of usb connected
 814  * @di:         pointer to the ab8500_charger structure
 815  *
 816  * Detect the type of the plugged USB
 817  * Returns error code in case of failure else 0 on success
 818  */
 819 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 820 {
 821         int ret;
 822         u8 val;
 823
 824         ret = abx500_get_register_interruptible(di->dev,
 825                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 826         if (ret < 0) {
 827                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 828                 return ret;
 829         }
 830         if (is_ab8500(di->parent))
 831                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 832                         AB8500_USB_LINE_STAT_REG, &val);
 833         else
 834                 ret = abx500_get_register_interruptible(di->dev,
 835                         AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 836         if (ret < 0) {
 837                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 838                 return ret;
 839         }
 840
 841         /* get the USB type */
 842         if (is_ab8500(di->parent))
 843                 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 844         else
 845                 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 846         ret = ab8500_charger_max_usb_curr(di,
 847                 (enum ab8500_charger_link_status) val);
 848
 849         return ret;
 850 }
 851
 852 /**
 853  * ab8500_charger_detect_usb_type() - get the type of usb connected
 854  * @di:         pointer to the ab8500_charger structure
 855  *
 856  * Detect the type of the plugged USB
 857  * Returns error code in case of failure else 0 on success
 858  */
 859 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 860 {
 861         int i, ret;
 862         u8 val;
 863
 864         /*
 865          * On getting the VBUS rising edge detect interrupt there
 866          * is a 250ms delay after which the register UsbLineStatus
 867          * is filled with valid data.
 868          */
 869         for (i = 0; i < 10; i++) {
 870                 msleep(250);
 871                 ret = abx500_get_register_interruptible(di->dev,
 872                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 873                         &val);
 874                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
 875                         __func__, val);
 876                 if (ret < 0) {
 877                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 878                         return ret;
 879                 }
 880
 881                 if (is_ab8500(di->parent))
 882                         ret = abx500_get_register_interruptible(di->dev,
 883                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
 884                 else
 885                         ret = abx500_get_register_interruptible(di->dev,
 886                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 887                 if (ret < 0) {
 888                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 889                         return ret;
 890                 }
 891                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
 892                         val);
 893                 /*
 894                  * Until the IT source register is read the UsbLineStatus
 895                  * register is not updated, hence doing the same
 896                  * Revisit this:
 897                  */
 898
 899                 /* get the USB type */
 900                 if (is_ab8500(di->parent))
 901                         val = (val & AB8500_USB_LINK_STATUS) >>
 902                                                         USB_LINK_STATUS_SHIFT;
 903                 else
 904                         val = (val & AB8505_USB_LINK_STATUS) >>
 905                                                         USB_LINK_STATUS_SHIFT;
 906                 if (val)
 907                         break;
 908         }
 909         ret = ab8500_charger_max_usb_curr(di,
 910                 (enum ab8500_charger_link_status) val);
 911
 912         return ret;
 913 }
 914
 915 /*
 916  * This array maps the raw hex value to charger voltage used by the AB8500
 917  * Values taken from the UM0836
 918  */
 919 static int ab8500_charger_voltage_map[] = {
 920         3500 ,
 921         3525 ,
 922         3550 ,
 923         3575 ,
 924         3600 ,
 925         3625 ,
 926         3650 ,
 927         3675 ,
 928         3700 ,
 929         3725 ,
 930         3750 ,
 931         3775 ,
 932         3800 ,
 933         3825 ,
 934         3850 ,
 935         3875 ,
 936         3900 ,
 937         3925 ,
 938         3950 ,
 939         3975 ,
 940         4000 ,
 941         4025 ,
 942         4050 ,
 943         4060 ,
 944         4070 ,
 945         4080 ,
 946         4090 ,
 947         4100 ,
 948         4110 ,
 949         4120 ,
 950         4130 ,
 951         4140 ,
 952         4150 ,
 953         4160 ,
 954         4170 ,
 955         4180 ,
 956         4190 ,
 957         4200 ,
 958         4210 ,
 959         4220 ,
 960         4230 ,
 961         4240 ,
 962         4250 ,
 963         4260 ,
 964         4270 ,
 965         4280 ,
 966         4290 ,
 967         4300 ,
 968         4310 ,
 969         4320 ,
 970         4330 ,
 971         4340 ,
 972         4350 ,
 973         4360 ,
 974         4370 ,
 975         4380 ,
 976         4390 ,
 977         4400 ,
 978         4410 ,
 979         4420 ,
 980         4430 ,
 981         4440 ,
 982         4450 ,
 983         4460 ,
 984         4470 ,
 985         4480 ,
 986         4490 ,
 987         4500 ,
 988         4510 ,
 989         4520 ,
 990         4530 ,
 991         4540 ,
 992         4550 ,
 993         4560 ,
 994         4570 ,
 995         4580 ,
 996         4590 ,
 997         4600 ,
 998 };
 999
1000 static int ab8500_voltage_to_regval(int voltage)
1001 {
1002         int i;
1003
1004         /* Special case for voltage below 3.5V */
1005         if (voltage < ab8500_charger_voltage_map[0])
1006                 return LOW_VOLT_REG;
1007
1008         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
1009                 if (voltage < ab8500_charger_voltage_map[i])
1010                         return i - 1;
1011         }
1012
1013         /* If not last element, return error */
1014         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
1015         if (voltage == ab8500_charger_voltage_map[i])
1016                 return i;
1017         else
1018                 return -1;
1019 }
1020
1021 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1022 {
1023         int i;
1024
1025         if (curr < di->bm->chg_output_curr[0])
1026                 return 0;
1027
1028         for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1029                 if (curr < di->bm->chg_output_curr[i])
1030                         return i - 1;
1031         }
1032
1033         /* If not last element, return error */
1034         i = di->bm->n_chg_out_curr - 1;
1035         if (curr == di->bm->chg_output_curr[i])
1036                 return i;
1037         else
1038                 return -1;
1039 }
1040
1041 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1042 {
1043         int i;
1044
1045         if (curr < di->bm->chg_input_curr[0])
1046                 return 0;
1047
1048         for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1049                 if (curr < di->bm->chg_input_curr[i])
1050                         return i - 1;
1051         }
1052
1053         /* If not last element, return error */
1054         i = di->bm->n_chg_in_curr - 1;
1055         if (curr == di->bm->chg_input_curr[i])
1056                 return i;
1057         else
1058                 return -1;
1059 }
1060
1061 /**
1062  * ab8500_charger_get_usb_cur() - get usb current
1063  * @di:         pointer to the ab8500_charger structre
1064  *
1065  * The usb stack provides the maximum current that can be drawn from
1066  * the standard usb host. This will be in mA.
1067  * This function converts current in mA to a value that can be written
1068  * to the register. Returns -1 if charging is not allowed
1069  */
1070 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1071 {
1072         int ret = 0;
1073         switch (di->usb_state.usb_current) {
1074         case 100:
1075                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1076                 break;
1077         case 200:
1078                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1079                 break;
1080         case 300:
1081                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1082                 break;
1083         case 400:
1084                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1085                 break;
1086         case 500:
1087                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1088                 break;
1089         default:
1090                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1091                 ret = -EPERM;
1092                 break;
1093         };
1094         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1095         return ret;
1096 }
1097
1098 /**
1099  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1100  * @di:         pointer to the ab8500_charger structure
1101  * @reg:        select what charger register to check
1102  *
1103  * Check if current stepping should be allowed to continue.
1104  * Checks if charger source has not collapsed. If it has, further stepping
1105  * is not allowed.
1106  */
1107 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1108                                                    int reg)
1109 {
1110         if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1111                 return !di->flags.vbus_drop_end;
1112         else
1113                 return true;
1114 }
1115
1116 /**
1117  * ab8500_charger_set_current() - set charger current
1118  * @di:         pointer to the ab8500_charger structure
1119  * @ich:        charger current, in mA
1120  * @reg:        select what charger register to set
1121  *
1122  * Set charger current.
1123  * There is no state machine in the AB to step up/down the charger
1124  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1125  * charging is started. Instead we need to implement
1126  * this charger current step-up/down here.
1127  * Returns error code in case of failure else 0(on success)
1128  */
1129 static int ab8500_charger_set_current(struct ab8500_charger *di,
1130         int ich, int reg)
1131 {
1132         int ret = 0;
1133         int curr_index, prev_curr_index, shift_value, i;
1134         u8 reg_value;
1135         u32 step_udelay;
1136         bool no_stepping = false;
1137
1138         atomic_inc(&di->current_stepping_sessions);
1139
1140         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1141                 reg, &reg_value);
1142         if (ret < 0) {
1143                 dev_err(di->dev, "%s read failed\n", __func__);
1144                 goto exit_set_current;
1145         }
1146
1147         switch (reg) {
1148         case AB8500_MCH_IPT_CURLVL_REG:
1149                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1150                 prev_curr_index = (reg_value >> shift_value);
1151                 curr_index = ab8500_current_to_regval(di, ich);
1152                 step_udelay = STEP_UDELAY;
1153                 if (!di->ac.charger_connected)
1154                         no_stepping = true;
1155                 break;
1156         case AB8500_USBCH_IPT_CRNTLVL_REG:
1157                 if (is_ab8540(di->parent))
1158                         shift_value = AB8540_VBUS_IN_CURR_LIM_SHIFT;
1159                 else
1160                         shift_value = VBUS_IN_CURR_LIM_SHIFT;
1161                 prev_curr_index = (reg_value >> shift_value);
1162                 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1163                 step_udelay = STEP_UDELAY * 100;
1164
1165                 if (!di->usb.charger_connected)
1166                         no_stepping = true;
1167                 break;
1168         case AB8500_CH_OPT_CRNTLVL_REG:
1169                 shift_value = 0;
1170                 prev_curr_index = (reg_value >> shift_value);
1171                 curr_index = ab8500_current_to_regval(di, ich);
1172                 step_udelay = STEP_UDELAY;
1173                 if (curr_index && (curr_index - prev_curr_index) > 1)
1174                         step_udelay *= 100;
1175
1176                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1177                         no_stepping = true;
1178
1179                 break;
1180         default:
1181                 dev_err(di->dev, "%s current register not valid\n", __func__);
1182                 ret = -ENXIO;
1183                 goto exit_set_current;
1184         }
1185
1186         if (curr_index < 0) {
1187                 dev_err(di->dev, "requested current limit out-of-range\n");
1188                 ret = -ENXIO;
1189                 goto exit_set_current;
1190         }
1191
1192         /* only update current if it's been changed */
1193         if (prev_curr_index == curr_index) {
1194                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1195                         __func__, reg);
1196                 ret = 0;
1197                 goto exit_set_current;
1198         }
1199
1200         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1201                 __func__, ich, reg);
1202
1203         if (no_stepping) {
1204                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1205                                         reg, (u8)curr_index << shift_value);
1206                 if (ret)
1207                         dev_err(di->dev, "%s write failed\n", __func__);
1208         } else if (prev_curr_index > curr_index) {
1209                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1210                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1211                                 (u8) i << shift_value, reg);
1212                         ret = abx500_set_register_interruptible(di->dev,
1213                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1214                         if (ret) {
1215                                 dev_err(di->dev, "%s write failed\n", __func__);
1216                                 goto exit_set_current;
1217                         }
1218                         if (i != curr_index)
1219                                 usleep_range(step_udelay, step_udelay * 2);
1220                 }
1221         } else {
1222                 bool allow = true;
1223                 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1224                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1225                                 (u8)i << shift_value, reg);
1226                         ret = abx500_set_register_interruptible(di->dev,
1227                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1228                         if (ret) {
1229                                 dev_err(di->dev, "%s write failed\n", __func__);
1230                                 goto exit_set_current;
1231                         }
1232                         if (i != curr_index)
1233                                 usleep_range(step_udelay, step_udelay * 2);
1234
1235                         allow = ab8500_charger_check_continue_stepping(di, reg);
1236                 }
1237         }
1238
1239 exit_set_current:
1240         atomic_dec(&di->current_stepping_sessions);
1241
1242         return ret;
1243 }
1244
1245 /**
1246  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1247  * @di:         pointer to the ab8500_charger structure
1248  * @ich_in:     charger input current limit
1249  *
1250  * Sets the current that can be drawn from the USB host
1251  * Returns error code in case of failure else 0(on success)
1252  */
1253 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1254                 int ich_in)
1255 {
1256         int min_value;
1257         int ret;
1258
1259         /* We should always use to lowest current limit */
1260         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1261         if (di->max_usb_in_curr.set_max > 0)
1262                 min_value = min(di->max_usb_in_curr.set_max, min_value);
1263
1264         if (di->usb_state.usb_current >= 0)
1265                 min_value = min(di->usb_state.usb_current, min_value);
1266
1267         switch (min_value) {
1268         case 100:
1269                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1270                         min_value = USB_CH_IP_CUR_LVL_0P05;
1271                 break;
1272         case 500:
1273                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1274                         min_value = USB_CH_IP_CUR_LVL_0P45;
1275                 break;
1276         default:
1277                 break;
1278         }
1279
1280         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1281
1282         mutex_lock(&di->usb_ipt_crnt_lock);
1283         ret = ab8500_charger_set_current(di, min_value,
1284                 AB8500_USBCH_IPT_CRNTLVL_REG);
1285         mutex_unlock(&di->usb_ipt_crnt_lock);
1286
1287         return ret;
1288 }
1289
1290 /**
1291  * ab8500_charger_set_main_in_curr() - set main charger input current
1292  * @di:         pointer to the ab8500_charger structure
1293  * @ich_in:     input charger current, in mA
1294  *
1295  * Set main charger input current.
1296  * Returns error code in case of failure else 0(on success)
1297  */
1298 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1299         int ich_in)
1300 {
1301         return ab8500_charger_set_current(di, ich_in,
1302                 AB8500_MCH_IPT_CURLVL_REG);
1303 }
1304
1305 /**
1306  * ab8500_charger_set_output_curr() - set charger output current
1307  * @di:         pointer to the ab8500_charger structure
1308  * @ich_out:    output charger current, in mA
1309  *
1310  * Set charger output current.
1311  * Returns error code in case of failure else 0(on success)
1312  */
1313 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1314         int ich_out)
1315 {
1316         return ab8500_charger_set_current(di, ich_out,
1317                 AB8500_CH_OPT_CRNTLVL_REG);
1318 }
1319
1320 /**
1321  * ab8500_charger_led_en() - turn on/off chargign led
1322  * @di:         pointer to the ab8500_charger structure
1323  * @on:         flag to turn on/off the chargign led
1324  *
1325  * Power ON/OFF charging LED indication
1326  * Returns error code in case of failure else 0(on success)
1327  */
1328 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1329 {
1330         int ret;
1331
1332         if (on) {
1333                 /* Power ON charging LED indicator, set LED current to 5mA */
1334                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1335                         AB8500_LED_INDICATOR_PWM_CTRL,
1336                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1337                 if (ret) {
1338                         dev_err(di->dev, "Power ON LED failed\n");
1339                         return ret;
1340                 }
1341                 /* LED indicator PWM duty cycle 252/256 */
1342                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1343                         AB8500_LED_INDICATOR_PWM_DUTY,
1344                         LED_INDICATOR_PWM_DUTY_252_256);
1345                 if (ret) {
1346                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1347                         return ret;
1348                 }
1349         } else {
1350                 /* Power off charging LED indicator */
1351                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1352                         AB8500_LED_INDICATOR_PWM_CTRL,
1353                         LED_INDICATOR_PWM_DIS);
1354                 if (ret) {
1355                         dev_err(di->dev, "Power-off LED failed\n");
1356                         return ret;
1357                 }
1358         }
1359
1360         return ret;
1361 }
1362
1363 /**
1364  * ab8500_charger_ac_en() - enable or disable ac charging
1365  * @di:         pointer to the ab8500_charger structure
1366  * @enable:     enable/disable flag
1367  * @vset:       charging voltage
1368  * @iset:       charging current
1369  *
1370  * Enable/Disable AC/Mains charging and turns on/off the charging led
1371  * respectively.
1372  **/
1373 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1374         int enable, int vset, int iset)
1375 {
1376         int ret;
1377         int volt_index;
1378         int curr_index;
1379         int input_curr_index;
1380         u8 overshoot = 0;
1381
1382         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1383
1384         if (enable) {
1385                 /* Check if AC is connected */
1386                 if (!di->ac.charger_connected) {
1387                         dev_err(di->dev, "AC charger not connected\n");
1388                         return -ENXIO;
1389                 }
1390
1391                 /* Enable AC charging */
1392                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1393
1394                 /*
1395                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1396                  * will be triggered everytime we enable the VDD ADC supply.
1397                  * This will turn off charging for a short while.
1398                  * It can be avoided by having the supply on when
1399                  * there is a charger enabled. Normally the VDD ADC supply
1400                  * is enabled everytime a GPADC conversion is triggered. We will
1401                  * force it to be enabled from this driver to have
1402                  * the GPADC module independant of the AB8500 chargers
1403                  */
1404                 if (!di->vddadc_en_ac) {
1405                         ret = regulator_enable(di->regu);
1406                         if (ret)
1407                                 dev_warn(di->dev,
1408                                         "Failed to enable regulator\n");
1409                         else
1410                                 di->vddadc_en_ac = true;
1411                 }
1412
1413                 /* Check if the requested voltage or current is valid */
1414                 volt_index = ab8500_voltage_to_regval(vset);
1415                 curr_index = ab8500_current_to_regval(di, iset);
1416                 input_curr_index = ab8500_current_to_regval(di,
1417                         di->bm->chg_params->ac_curr_max);
1418                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1419                         dev_err(di->dev,
1420                                 "Charger voltage or current too high, "
1421                                 "charging not started\n");
1422                         return -ENXIO;
1423                 }
1424
1425                 /* ChVoltLevel: maximum battery charging voltage */
1426                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1427                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1428                 if (ret) {
1429                         dev_err(di->dev, "%s write failed\n", __func__);
1430                         return ret;
1431                 }
1432                 /* MainChInputCurr: current that can be drawn from the charger*/
1433                 ret = ab8500_charger_set_main_in_curr(di,
1434                         di->bm->chg_params->ac_curr_max);
1435                 if (ret) {
1436                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1437                                 __func__);
1438                         return ret;
1439                 }
1440                 /* ChOutputCurentLevel: protected output current */
1441                 ret = ab8500_charger_set_output_curr(di, iset);
1442                 if (ret) {
1443                         dev_err(di->dev, "%s "
1444                                 "Failed to set ChOutputCurentLevel\n",
1445                                 __func__);
1446                         return ret;
1447                 }
1448
1449                 /* Check if VBAT overshoot control should be enabled */
1450                 if (!di->bm->enable_overshoot)
1451                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1452
1453                 /* Enable Main Charger */
1454                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1455                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1456                 if (ret) {
1457                         dev_err(di->dev, "%s write failed\n", __func__);
1458                         return ret;
1459                 }
1460
1461                 /* Power on charging LED indication */
1462                 ret = ab8500_charger_led_en(di, true);
1463                 if (ret < 0)
1464                         dev_err(di->dev, "failed to enable LED\n");
1465
1466                 di->ac.charger_online = 1;
1467         } else {
1468                 /* Disable AC charging */
1469                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1470                         /*
1471                          * For ABB revision 1.0 and 1.1 there is a bug in the
1472                          * watchdog logic. That means we have to continously
1473                          * kick the charger watchdog even when no charger is
1474                          * connected. This is only valid once the AC charger
1475                          * has been enabled. This is a bug that is not handled
1476                          * by the algorithm and the watchdog have to be kicked
1477                          * by the charger driver when the AC charger
1478                          * is disabled
1479                          */
1480                         if (di->ac_conn) {
1481                                 queue_delayed_work(di->charger_wq,
1482                                         &di->kick_wd_work,
1483                                         round_jiffies(WD_KICK_INTERVAL));
1484                         }
1485
1486                         /*
1487                          * We can't turn off charging completely
1488                          * due to a bug in AB8500 cut1.
1489                          * If we do, charging will not start again.
1490                          * That is why we set the lowest voltage
1491                          * and current possible
1492                          */
1493                         ret = abx500_set_register_interruptible(di->dev,
1494                                 AB8500_CHARGER,
1495                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1496                         if (ret) {
1497                                 dev_err(di->dev,
1498                                         "%s write failed\n", __func__);
1499                                 return ret;
1500                         }
1501
1502                         ret = ab8500_charger_set_output_curr(di, 0);
1503                         if (ret) {
1504                                 dev_err(di->dev, "%s "
1505                                         "Failed to set ChOutputCurentLevel\n",
1506                                         __func__);
1507                                 return ret;
1508                         }
1509                 } else {
1510                         ret = abx500_set_register_interruptible(di->dev,
1511                                 AB8500_CHARGER,
1512                                 AB8500_MCH_CTRL1, 0);
1513                         if (ret) {
1514                                 dev_err(di->dev,
1515                                         "%s write failed\n", __func__);
1516                                 return ret;
1517                         }
1518                 }
1519
1520                 ret = ab8500_charger_led_en(di, false);
1521                 if (ret < 0)
1522                         dev_err(di->dev, "failed to disable LED\n");
1523
1524                 di->ac.charger_online = 0;
1525                 di->ac.wd_expired = false;
1526
1527                 /* Disable regulator if enabled */
1528                 if (di->vddadc_en_ac) {
1529                         regulator_disable(di->regu);
1530                         di->vddadc_en_ac = false;
1531                 }
1532
1533                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1534         }
1535         ab8500_power_supply_changed(di, di->ac_chg.psy);
1536
1537         return ret;
1538 }
1539
1540 /**
1541  * ab8500_charger_usb_en() - enable usb charging
1542  * @di:         pointer to the ab8500_charger structure
1543  * @enable:     enable/disable flag
1544  * @vset:       charging voltage
1545  * @ich_out:    charger output current
1546  *
1547  * Enable/Disable USB charging and turns on/off the charging led respectively.
1548  * Returns error code in case of failure else 0(on success)
1549  */
1550 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1551         int enable, int vset, int ich_out)
1552 {
1553         int ret;
1554         int volt_index;
1555         int curr_index;
1556         u8 overshoot = 0;
1557
1558         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1559
1560         if (enable) {
1561                 /* Check if USB is connected */
1562                 if (!di->usb.charger_connected) {
1563                         dev_err(di->dev, "USB charger not connected\n");
1564                         return -ENXIO;
1565                 }
1566
1567                 /*
1568                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1569                  * will be triggered everytime we enable the VDD ADC supply.
1570                  * This will turn off charging for a short while.
1571                  * It can be avoided by having the supply on when
1572                  * there is a charger enabled. Normally the VDD ADC supply
1573                  * is enabled everytime a GPADC conversion is triggered. We will
1574                  * force it to be enabled from this driver to have
1575                  * the GPADC module independant of the AB8500 chargers
1576                  */
1577                 if (!di->vddadc_en_usb) {
1578                         ret = regulator_enable(di->regu);
1579                         if (ret)
1580                                 dev_warn(di->dev,
1581                                         "Failed to enable regulator\n");
1582                         else
1583                                 di->vddadc_en_usb = true;
1584                 }
1585
1586                 /* Enable USB charging */
1587                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1588
1589                 /* Check if the requested voltage or current is valid */
1590                 volt_index = ab8500_voltage_to_regval(vset);
1591                 curr_index = ab8500_current_to_regval(di, ich_out);
1592                 if (volt_index < 0 || curr_index < 0) {
1593                         dev_err(di->dev,
1594                                 "Charger voltage or current too high, "
1595                                 "charging not started\n");
1596                         return -ENXIO;
1597                 }
1598
1599                 /* ChVoltLevel: max voltage upto which battery can be charged */
1600                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1601                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1602                 if (ret) {
1603                         dev_err(di->dev, "%s write failed\n", __func__);
1604                         return ret;
1605                 }
1606                 /* Check if VBAT overshoot control should be enabled */
1607                 if (!di->bm->enable_overshoot)
1608                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1609
1610                 /* Enable USB Charger */
1611                 dev_dbg(di->dev,
1612                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1613                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1614                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1615                 if (ret) {
1616                         dev_err(di->dev, "%s write failed\n", __func__);
1617                         return ret;
1618                 }
1619
1620                 /* If success power on charging LED indication */
1621                 ret = ab8500_charger_led_en(di, true);
1622                 if (ret < 0)
1623                         dev_err(di->dev, "failed to enable LED\n");
1624
1625                 di->usb.charger_online = 1;
1626
1627                 /* USBChInputCurr: current that can be drawn from the usb */
1628                 ret = ab8500_charger_set_vbus_in_curr(di,
1629                                         di->max_usb_in_curr.usb_type_max);
1630                 if (ret) {
1631                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1632                         return ret;
1633                 }
1634
1635                 /* ChOutputCurentLevel: protected output current */
1636                 ret = ab8500_charger_set_output_curr(di, ich_out);
1637                 if (ret) {
1638                         dev_err(di->dev, "%s "
1639                                 "Failed to set ChOutputCurentLevel\n",
1640                                 __func__);
1641                         return ret;
1642                 }
1643
1644                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1645
1646         } else {
1647                 /* Disable USB charging */
1648                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1649                 ret = abx500_set_register_interruptible(di->dev,
1650                         AB8500_CHARGER,
1651                         AB8500_USBCH_CTRL1_REG, 0);
1652                 if (ret) {
1653                         dev_err(di->dev,
1654                                 "%s write failed\n", __func__);
1655                         return ret;
1656                 }
1657
1658                 ret = ab8500_charger_led_en(di, false);
1659                 if (ret < 0)
1660                         dev_err(di->dev, "failed to disable LED\n");
1661                 /* USBChInputCurr: current that can be drawn from the usb */
1662                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1663                 if (ret) {
1664                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1665                         return ret;
1666                 }
1667
1668                 /* ChOutputCurentLevel: protected output current */
1669                 ret = ab8500_charger_set_output_curr(di, 0);
1670                 if (ret) {
1671                         dev_err(di->dev, "%s "
1672                                 "Failed to reset ChOutputCurentLevel\n",
1673                                 __func__);
1674                         return ret;
1675                 }
1676                 di->usb.charger_online = 0;
1677                 di->usb.wd_expired = false;
1678
1679                 /* Disable regulator if enabled */
1680                 if (di->vddadc_en_usb) {
1681                         regulator_disable(di->regu);
1682                         di->vddadc_en_usb = false;
1683                 }
1684
1685                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1686
1687                 /* Cancel any pending Vbat check work */
1688                 cancel_delayed_work(&di->check_vbat_work);
1689
1690         }
1691         ab8500_power_supply_changed(di, di->usb_chg.psy);
1692
1693         return ret;
1694 }
1695
1696 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1697                                 unsigned long event, void *data)
1698 {
1699         int ret;
1700         struct device *dev = data;
1701         /*Toggle External charger control pin*/
1702         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1703                                   AB8500_SYS_CHARGER_CONTROL_REG,
1704                                   EXTERNAL_CHARGER_DISABLE_REG_VAL);
1705         if (ret < 0) {
1706                 dev_err(dev, "write reg failed %d\n", ret);
1707                 goto out;
1708         }
1709         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1710                                   AB8500_SYS_CHARGER_CONTROL_REG,
1711                                   EXTERNAL_CHARGER_ENABLE_REG_VAL);
1712         if (ret < 0)
1713                 dev_err(dev, "Write reg failed %d\n", ret);
1714
1715 out:
1716         return ret;
1717 }
1718
1719 /**
1720  * ab8500_charger_usb_check_enable() - enable usb charging
1721  * @charger:    pointer to the ux500_charger structure
1722  * @vset:       charging voltage
1723  * @iset:       charger output current
1724  *
1725  * Check if the VBUS charger has been disconnected and reconnected without
1726  * AB8500 rising an interrupt. Returns 0 on success.
1727  */
1728 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1729         int vset, int iset)
1730 {
1731         u8 usbch_ctrl1 = 0;
1732         int ret = 0;
1733
1734         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1735
1736         if (!di->usb.charger_connected)
1737                 return ret;
1738
1739         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1740                                 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1741         if (ret < 0) {
1742                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1743                 return ret;
1744         }
1745         dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1746
1747         if (!(usbch_ctrl1 & USB_CH_ENA)) {
1748                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1749
1750                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1751                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1752                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1753                 if (ret < 0) {
1754                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1755                         return ret;
1756                 }
1757
1758                 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1759                 if (ret < 0) {
1760                         dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1761                                         __LINE__);
1762                         return ret;
1763                 }
1764         }
1765         return ret;
1766 }
1767
1768 /**
1769  * ab8500_charger_ac_check_enable() - enable usb charging
1770  * @charger:    pointer to the ux500_charger structure
1771  * @vset:       charging voltage
1772  * @iset:       charger output current
1773  *
1774  * Check if the AC charger has been disconnected and reconnected without
1775  * AB8500 rising an interrupt. Returns 0 on success.
1776  */
1777 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1778         int vset, int iset)
1779 {
1780         u8 mainch_ctrl1 = 0;
1781         int ret = 0;
1782
1783         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1784
1785         if (!di->ac.charger_connected)
1786                 return ret;
1787
1788         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1789                                 AB8500_MCH_CTRL1, &mainch_ctrl1);
1790         if (ret < 0) {
1791                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1792                 return ret;
1793         }
1794         dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1795
1796         if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1797                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1798
1799                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1800                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1801                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1802
1803                 if (ret < 0) {
1804                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1805                         return ret;
1806                 }
1807
1808                 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1809                 if (ret < 0) {
1810                         dev_err(di->dev, "failed to enable AC charger %d\n",
1811                                 __LINE__);
1812                         return ret;
1813                 }
1814         }
1815         return ret;
1816 }
1817
1818 /**
1819  * ab8500_charger_watchdog_kick() - kick charger watchdog
1820  * @di:         pointer to the ab8500_charger structure
1821  *
1822  * Kick charger watchdog
1823  * Returns error code in case of failure else 0(on success)
1824  */
1825 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1826 {
1827         int ret;
1828         struct ab8500_charger *di;
1829
1830         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1831                 di = to_ab8500_charger_ac_device_info(charger);
1832         else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1833                 di = to_ab8500_charger_usb_device_info(charger);
1834         else
1835                 return -ENXIO;
1836
1837         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1838                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1839         if (ret)
1840                 dev_err(di->dev, "Failed to kick WD!\n");
1841
1842         return ret;
1843 }
1844
1845 /**
1846  * ab8500_charger_update_charger_current() - update charger current
1847  * @di:         pointer to the ab8500_charger structure
1848  *
1849  * Update the charger output current for the specified charger
1850  * Returns error code in case of failure else 0(on success)
1851  */
1852 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1853                 int ich_out)
1854 {
1855         int ret;
1856         struct ab8500_charger *di;
1857
1858         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1859                 di = to_ab8500_charger_ac_device_info(charger);
1860         else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1861                 di = to_ab8500_charger_usb_device_info(charger);
1862         else
1863                 return -ENXIO;
1864
1865         ret = ab8500_charger_set_output_curr(di, ich_out);
1866         if (ret) {
1867                 dev_err(di->dev, "%s "
1868                         "Failed to set ChOutputCurentLevel\n",
1869                         __func__);
1870                 return ret;
1871         }
1872
1873         /* Reset the main and usb drop input current measurement counter */
1874         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1875                                 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1876         if (ret) {
1877                 dev_err(di->dev, "%s write failed\n", __func__);
1878                 return ret;
1879         }
1880
1881         return ret;
1882 }
1883
1884 /**
1885  * ab8540_charger_power_path_enable() - enable usb power path mode
1886  * @charger:    pointer to the ux500_charger structure
1887  * @enable:     enable/disable flag
1888  *
1889  * Enable or disable the power path for usb mode
1890  * Returns error code in case of failure else 0(on success)
1891  */
1892 static int ab8540_charger_power_path_enable(struct ux500_charger *charger,
1893                 bool enable)
1894 {
1895         int ret;
1896         struct ab8500_charger *di;
1897
1898         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1899                 di = to_ab8500_charger_usb_device_info(charger);
1900         else
1901                 return -ENXIO;
1902
1903         ret = abx500_mask_and_set_register_interruptible(di->dev,
1904                                 AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
1905                                 BUS_POWER_PATH_MODE_ENA, enable);
1906         if (ret) {
1907                 dev_err(di->dev, "%s write failed\n", __func__);
1908                 return ret;
1909         }
1910
1911         return ret;
1912 }
1913
1914
1915 /**
1916  * ab8540_charger_usb_pre_chg_enable() - enable usb pre change
1917  * @charger:    pointer to the ux500_charger structure
1918  * @enable:     enable/disable flag
1919  *
1920  * Enable or disable the pre-chage for usb mode
1921  * Returns error code in case of failure else 0(on success)
1922  */
1923 static int ab8540_charger_usb_pre_chg_enable(struct ux500_charger *charger,
1924                 bool enable)
1925 {
1926         int ret;
1927         struct ab8500_charger *di;
1928
1929         if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1930                 di = to_ab8500_charger_usb_device_info(charger);
1931         else
1932                 return -ENXIO;
1933
1934         ret = abx500_mask_and_set_register_interruptible(di->dev,
1935                                 AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
1936                                 BUS_POWER_PATH_PRECHG_ENA, enable);
1937         if (ret) {
1938                 dev_err(di->dev, "%s write failed\n", __func__);
1939                 return ret;
1940         }
1941
1942         return ret;
1943 }
1944
1945 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1946 {
1947         struct power_supply *psy;
1948         struct power_supply *ext = dev_get_drvdata(dev);
1949         const char **supplicants = (const char **)ext->supplied_to;
1950         struct ab8500_charger *di;
1951         union power_supply_propval ret;
1952         int j;
1953         struct ux500_charger *usb_chg;
1954
1955         usb_chg = (struct ux500_charger *)data;
1956         psy = usb_chg->psy;
1957
1958         di = to_ab8500_charger_usb_device_info(usb_chg);
1959
1960         /* For all psy where the driver name appears in any supplied_to */
1961         j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
1962         if (j < 0)
1963                 return 0;
1964
1965         /* Go through all properties for the psy */
1966         for (j = 0; j < ext->desc->num_properties; j++) {
1967                 enum power_supply_property prop;
1968                 prop = ext->desc->properties[j];
1969
1970                 if (power_supply_get_property(ext, prop, &ret))
1971                         continue;
1972
1973                 switch (prop) {
1974                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1975                         switch (ext->desc->type) {
1976                         case POWER_SUPPLY_TYPE_BATTERY:
1977                                 di->vbat = ret.intval / 1000;
1978                                 break;
1979                         default:
1980                                 break;
1981                         }
1982                         break;
1983                 default:
1984                         break;
1985                 }
1986         }
1987         return 0;
1988 }
1989
1990 /**
1991  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1992  * @work        pointer to the work_struct structure
1993  *
1994  * Due to a asic bug it is necessary to lower the input current to the vbus
1995  * charger when charging with at some specific levels. This issue is only valid
1996  * for below a certain battery voltage. This function makes sure that the
1997  * the allowed current limit isn't exceeded.
1998  */
1999 static void ab8500_charger_check_vbat_work(struct work_struct *work)
2000 {
2001         int t = 10;
2002         struct ab8500_charger *di = container_of(work,
2003                 struct ab8500_charger, check_vbat_work.work);
2004
2005         class_for_each_device(power_supply_class, NULL,
2006                 di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
2007
2008         /* First run old_vbat is 0. */
2009         if (di->old_vbat == 0)
2010                 di->old_vbat = di->vbat;
2011
2012         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
2013                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
2014                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
2015                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
2016
2017                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
2018                         " old: %d\n", di->max_usb_in_curr.usb_type_max,
2019                         di->vbat, di->old_vbat);
2020                 ab8500_charger_set_vbus_in_curr(di,
2021                                         di->max_usb_in_curr.usb_type_max);
2022                 power_supply_changed(di->usb_chg.psy);
2023         }
2024
2025         di->old_vbat = di->vbat;
2026
2027         /*
2028          * No need to check the battery voltage every second when not close to
2029          * the threshold.
2030          */
2031         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
2032                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
2033                         t = 1;
2034
2035         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
2036 }
2037
2038 /**
2039  * ab8500_charger_check_hw_failure_work() - check main charger failure
2040  * @work:       pointer to the work_struct structure
2041  *
2042  * Work queue function for checking the main charger status
2043  */
2044 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
2045 {
2046         int ret;
2047         u8 reg_value;
2048
2049         struct ab8500_charger *di = container_of(work,
2050                 struct ab8500_charger, check_hw_failure_work.work);
2051
2052         /* Check if the status bits for HW failure is still active */
2053         if (di->flags.mainextchnotok) {
2054                 ret = abx500_get_register_interruptible(di->dev,
2055                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2056                 if (ret < 0) {
2057                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2058                         return;
2059                 }
2060                 if (!(reg_value & MAIN_CH_NOK)) {
2061                         di->flags.mainextchnotok = false;
2062                         ab8500_power_supply_changed(di, di->ac_chg.psy);
2063                 }
2064         }
2065         if (di->flags.vbus_ovv) {
2066                 ret = abx500_get_register_interruptible(di->dev,
2067                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
2068                         &reg_value);
2069                 if (ret < 0) {
2070                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2071                         return;
2072                 }
2073                 if (!(reg_value & VBUS_OVV_TH)) {
2074                         di->flags.vbus_ovv = false;
2075                         ab8500_power_supply_changed(di, di->usb_chg.psy);
2076                 }
2077         }
2078         /* If we still have a failure, schedule a new check */
2079         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
2080                 queue_delayed_work(di->charger_wq,
2081                         &di->check_hw_failure_work, round_jiffies(HZ));
2082         }
2083 }
2084
2085 /**
2086  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2087  * @work:       pointer to the work_struct structure
2088  *
2089  * Work queue function for kicking the charger watchdog.
2090  *
2091  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2092  * logic. That means we have to continously kick the charger
2093  * watchdog even when no charger is connected. This is only
2094  * valid once the AC charger has been enabled. This is
2095  * a bug that is not handled by the algorithm and the
2096  * watchdog have to be kicked by the charger driver
2097  * when the AC charger is disabled
2098  */
2099 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2100 {
2101         int ret;
2102
2103         struct ab8500_charger *di = container_of(work,
2104                 struct ab8500_charger, kick_wd_work.work);
2105
2106         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2107                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2108         if (ret)
2109                 dev_err(di->dev, "Failed to kick WD!\n");
2110
2111         /* Schedule a new watchdog kick */
2112         queue_delayed_work(di->charger_wq,
2113                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2114 }
2115
2116 /**
2117  * ab8500_charger_ac_work() - work to get and set main charger status
2118  * @work:       pointer to the work_struct structure
2119  *
2120  * Work queue function for checking the main charger status
2121  */
2122 static void ab8500_charger_ac_work(struct work_struct *work)
2123 {
2124         int ret;
2125
2126         struct ab8500_charger *di = container_of(work,
2127                 struct ab8500_charger, ac_work);
2128
2129         /*
2130          * Since we can't be sure that the events are received
2131          * synchronously, we have the check if the main charger is
2132          * connected by reading the status register
2133          */
2134         ret = ab8500_charger_detect_chargers(di, false);
2135         if (ret < 0)
2136                 return;
2137
2138         if (ret & AC_PW_CONN) {
2139                 di->ac.charger_connected = 1;
2140                 di->ac_conn = true;
2141         } else {
2142                 di->ac.charger_connected = 0;
2143         }
2144
2145         ab8500_power_supply_changed(di, di->ac_chg.psy);
2146         sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
2147 }
2148
2149 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2150 {
2151         struct ab8500_charger *di = container_of(work,
2152                                                  struct ab8500_charger,
2153                                                  usb_charger_attached_work.work);
2154         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2155         int ret, i;
2156         u8 statval;
2157
2158         for (i = 0; i < 10; i++) {
2159                 ret = abx500_get_register_interruptible(di->dev,
2160                                                         AB8500_CHARGER,
2161                                                         AB8500_CH_USBCH_STAT1_REG,
2162                                                         &statval);
2163                 if (ret < 0) {
2164                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2165                         goto reschedule;
2166                 }
2167                 if ((statval & usbch) != usbch)
2168                         goto reschedule;
2169
2170                 msleep(CHARGER_STATUS_POLL);
2171         }
2172
2173         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2174
2175         mutex_lock(&di->charger_attached_mutex);
2176         mutex_unlock(&di->charger_attached_mutex);
2177
2178         return;
2179
2180 reschedule:
2181         queue_delayed_work(di->charger_wq,
2182                            &di->usb_charger_attached_work,
2183                            HZ);
2184 }
2185
2186 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2187 {
2188
2189         struct ab8500_charger *di = container_of(work,
2190                                                  struct ab8500_charger,
2191                                                  ac_charger_attached_work.work);
2192         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2193                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2194         int ret, i;
2195         u8 statval;
2196
2197         for (i = 0; i < 10; i++) {
2198                 ret = abx500_get_register_interruptible(di->dev,
2199                                                         AB8500_CHARGER,
2200                                                         AB8500_CH_STATUS2_REG,
2201                                                         &statval);
2202                 if (ret < 0) {
2203                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2204                         goto reschedule;
2205                 }
2206
2207                 if ((statval & mainch) != mainch)
2208                         goto reschedule;
2209
2210                 msleep(CHARGER_STATUS_POLL);
2211         }
2212
2213         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2214         queue_work(di->charger_wq, &di->ac_work);
2215
2216         mutex_lock(&di->charger_attached_mutex);
2217         mutex_unlock(&di->charger_attached_mutex);
2218
2219         return;
2220
2221 reschedule:
2222         queue_delayed_work(di->charger_wq,
2223                            &di->ac_charger_attached_work,
2224                            HZ);
2225 }
2226
2227 /**
2228  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2229  * @work:       Pointer to the work_struct structure
2230  *
2231  * Detect the type of USB plugged
2232  */
2233 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2234 {
2235         int ret;
2236
2237         struct ab8500_charger *di = container_of(work,
2238                 struct ab8500_charger, detect_usb_type_work);
2239
2240         /*
2241          * Since we can't be sure that the events are received
2242          * synchronously, we have the check if is
2243          * connected by reading the status register
2244          */
2245         ret = ab8500_charger_detect_chargers(di, false);
2246         if (ret < 0)
2247                 return;
2248
2249         if (!(ret & USB_PW_CONN)) {
2250                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2251                 di->vbus_detected = false;
2252                 ab8500_charger_set_usb_connected(di, false);
2253                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2254         } else {
2255                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2256                 di->vbus_detected = true;
2257
2258                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2259                         ret = ab8500_charger_detect_usb_type(di);
2260                         if (!ret) {
2261                                 ab8500_charger_set_usb_connected(di, true);
2262                                 ab8500_power_supply_changed(di,
2263                                                             di->usb_chg.psy);
2264                         }
2265                 } else {
2266                         /*
2267                          * For ABB cut2.0 and onwards we have an IRQ,
2268                          * USB_LINK_STATUS that will be triggered when the USB
2269                          * link status changes. The exception is USB connected
2270                          * during startup. Then we don't get a
2271                          * USB_LINK_STATUS IRQ
2272                          */
2273                         if (di->vbus_detected_start) {
2274                                 di->vbus_detected_start = false;
2275                                 ret = ab8500_charger_detect_usb_type(di);
2276                                 if (!ret) {
2277                                         ab8500_charger_set_usb_connected(di,
2278                                                 true);
2279                                         ab8500_power_supply_changed(di,
2280                                                 di->usb_chg.psy);
2281                                 }
2282                         }
2283                 }
2284         }
2285 }
2286
2287 /**
2288  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2289  * @work:       pointer to the work_struct structure
2290  *
2291  * Detect the type of USB plugged
2292  */
2293 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2294 {
2295         struct ab8500_charger *di =
2296                 container_of(work, struct ab8500_charger, attach_work.work);
2297         int ret;
2298
2299         /* Update maximum input current if USB enumeration is not detected */
2300         if (!di->usb.charger_online) {
2301                 ret = ab8500_charger_set_vbus_in_curr(di,
2302                                         di->max_usb_in_curr.usb_type_max);
2303                 if (ret)
2304                         return;
2305         }
2306
2307         ab8500_charger_set_usb_connected(di, true);
2308         ab8500_power_supply_changed(di, di->usb_chg.psy);
2309 }
2310
2311 /**
2312  * ab8500_charger_usb_link_status_work() - work to detect USB type
2313  * @work:       pointer to the work_struct structure
2314  *
2315  * Detect the type of USB plugged
2316  */
2317 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2318 {
2319         int detected_chargers;
2320         int ret;
2321         u8 val;
2322         u8 link_status;
2323
2324         struct ab8500_charger *di = container_of(work,
2325                 struct ab8500_charger, usb_link_status_work);
2326
2327         /*
2328          * Since we can't be sure that the events are received
2329          * synchronously, we have the check if  is
2330          * connected by reading the status register
2331          */
2332         detected_chargers = ab8500_charger_detect_chargers(di, false);
2333         if (detected_chargers < 0)
2334                 return;
2335
2336         /*
2337          * Some chargers that breaks the USB spec is
2338          * identified as invalid by AB8500 and it refuse
2339          * to start the charging process. but by jumping
2340          * thru a few hoops it can be forced to start.
2341          */
2342         if (is_ab8500(di->parent))
2343                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2344                                         AB8500_USB_LINE_STAT_REG, &val);
2345         else
2346                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2347                                         AB8500_USB_LINK1_STAT_REG, &val);
2348
2349         if (ret >= 0)
2350                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2351         else
2352                 dev_dbg(di->dev, "Error reading USB link status\n");
2353
2354         if (is_ab8500(di->parent))
2355                 link_status = AB8500_USB_LINK_STATUS;
2356         else
2357                 link_status = AB8505_USB_LINK_STATUS;
2358
2359         if (detected_chargers & USB_PW_CONN) {
2360                 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2361                                 USB_STAT_NOT_VALID_LINK &&
2362                                 di->invalid_charger_detect_state == 0) {
2363                         dev_dbg(di->dev,
2364                                         "Invalid charger detected, state= 0\n");
2365                         /*Enable charger*/
2366                         abx500_mask_and_set_register_interruptible(di->dev,
2367                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2368                                         USB_CH_ENA, USB_CH_ENA);
2369                         /*Enable charger detection*/
2370                         abx500_mask_and_set_register_interruptible(di->dev,
2371                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2372                                         USB_CH_DET, USB_CH_DET);
2373                         di->invalid_charger_detect_state = 1;
2374                         /*exit and wait for new link status interrupt.*/
2375                         return;
2376
2377                 }
2378                 if (di->invalid_charger_detect_state == 1) {
2379                         dev_dbg(di->dev,
2380                                         "Invalid charger detected, state= 1\n");
2381                         /*Stop charger detection*/
2382                         abx500_mask_and_set_register_interruptible(di->dev,
2383                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2384                                         USB_CH_DET, 0x00);
2385                         /*Check link status*/
2386                         if (is_ab8500(di->parent))
2387                                 ret = abx500_get_register_interruptible(di->dev,
2388                                         AB8500_USB, AB8500_USB_LINE_STAT_REG,
2389                                         &val);
2390                         else
2391                                 ret = abx500_get_register_interruptible(di->dev,
2392                                         AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2393                                         &val);
2394
2395                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2396                                 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2397                         di->invalid_charger_detect_state = 2;
2398                 }
2399         } else {
2400                 di->invalid_charger_detect_state = 0;
2401         }
2402
2403         if (!(detected_chargers & USB_PW_CONN)) {
2404                 di->vbus_detected = false;
2405                 ab8500_charger_set_usb_connected(di, false);
2406                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2407                 return;
2408         }
2409
2410         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2411         di->vbus_detected = true;
2412         ret = ab8500_charger_read_usb_type(di);
2413         if (ret) {
2414                 if (ret == -ENXIO) {
2415                         /* No valid charger type detected */
2416                         ab8500_charger_set_usb_connected(di, false);
2417                         ab8500_power_supply_changed(di, di->usb_chg.psy);
2418                 }
2419                 return;
2420         }
2421
2422         if (di->usb_device_is_unrecognised) {
2423                 dev_dbg(di->dev,
2424                         "Potential Legacy Charger device. "
2425                         "Delay work for %d msec for USB enum "
2426                         "to finish",
2427                         WAIT_ACA_RID_ENUMERATION);
2428                 queue_delayed_work(di->charger_wq,
2429                                    &di->attach_work,
2430                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2431         } else if (di->is_aca_rid == 1) {
2432                 /* Only wait once */
2433                 di->is_aca_rid++;
2434                 dev_dbg(di->dev,
2435                         "%s Wait %d msec for USB enum to finish",
2436                         __func__, WAIT_ACA_RID_ENUMERATION);
2437                 queue_delayed_work(di->charger_wq,
2438                                    &di->attach_work,
2439                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2440         } else {
2441                 queue_delayed_work(di->charger_wq,
2442                                    &di->attach_work,
2443                                    0);
2444         }
2445 }
2446
2447 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2448 {
2449         int ret;
2450         unsigned long flags;
2451
2452         struct ab8500_charger *di = container_of(work,
2453                 struct ab8500_charger, usb_state_changed_work.work);
2454
2455         if (!di->vbus_detected) {
2456                 dev_dbg(di->dev,
2457                         "%s !di->vbus_detected\n",
2458                         __func__);
2459                 return;
2460         }
2461
2462         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2463         di->usb_state.state = di->usb_state.state_tmp;
2464         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2465         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2466
2467         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2468                 __func__, di->usb_state.state, di->usb_state.usb_current);
2469
2470         switch (di->usb_state.state) {
2471         case AB8500_BM_USB_STATE_RESET_HS:
2472         case AB8500_BM_USB_STATE_RESET_FS:
2473         case AB8500_BM_USB_STATE_SUSPEND:
2474         case AB8500_BM_USB_STATE_MAX:
2475                 ab8500_charger_set_usb_connected(di, false);
2476                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2477                 break;
2478
2479         case AB8500_BM_USB_STATE_RESUME:
2480                 /*
2481                  * when suspend->resume there should be delay
2482                  * of 1sec for enabling charging
2483                  */
2484                 msleep(1000);
2485                 /* Intentional fall through */
2486         case AB8500_BM_USB_STATE_CONFIGURED:
2487                 /*
2488                  * USB is configured, enable charging with the charging
2489                  * input current obtained from USB driver
2490                  */
2491                 if (!ab8500_charger_get_usb_cur(di)) {
2492                         /* Update maximum input current */
2493                         ret = ab8500_charger_set_vbus_in_curr(di,
2494                                         di->max_usb_in_curr.usb_type_max);
2495                         if (ret)
2496                                 return;
2497
2498                         ab8500_charger_set_usb_connected(di, true);
2499                         ab8500_power_supply_changed(di, di->usb_chg.psy);
2500                 }
2501                 break;
2502
2503         default:
2504                 break;
2505         };
2506 }
2507
2508 /**
2509  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2510  * @work:       pointer to the work_struct structure
2511  *
2512  * Work queue function for checking the USB charger Not OK status
2513  */
2514 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2515 {
2516         int ret;
2517         u8 reg_value;
2518         bool prev_status;
2519
2520         struct ab8500_charger *di = container_of(work,
2521                 struct ab8500_charger, check_usbchgnotok_work.work);
2522
2523         /* Check if the status bit for usbchargernotok is still active */
2524         ret = abx500_get_register_interruptible(di->dev,
2525                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2526         if (ret < 0) {
2527                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2528                 return;
2529         }
2530         prev_status = di->flags.usbchargernotok;
2531
2532         if (reg_value & VBUS_CH_NOK) {
2533                 di->flags.usbchargernotok = true;
2534                 /* Check again in 1sec */
2535                 queue_delayed_work(di->charger_wq,
2536                         &di->check_usbchgnotok_work, HZ);
2537         } else {
2538                 di->flags.usbchargernotok = false;
2539                 di->flags.vbus_collapse = false;
2540         }
2541
2542         if (prev_status != di->flags.usbchargernotok)
2543                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2544 }
2545
2546 /**
2547  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2548  * @work:       pointer to the work_struct structure
2549  *
2550  * Work queue function for checking the Main thermal prot status
2551  */
2552 static void ab8500_charger_check_main_thermal_prot_work(
2553         struct work_struct *work)
2554 {
2555         int ret;
2556         u8 reg_value;
2557
2558         struct ab8500_charger *di = container_of(work,
2559                 struct ab8500_charger, check_main_thermal_prot_work);
2560
2561         /* Check if the status bit for main_thermal_prot is still active */
2562         ret = abx500_get_register_interruptible(di->dev,
2563                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2564         if (ret < 0) {
2565                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2566                 return;
2567         }
2568         if (reg_value & MAIN_CH_TH_PROT)
2569                 di->flags.main_thermal_prot = true;
2570         else
2571                 di->flags.main_thermal_prot = false;
2572
2573         ab8500_power_supply_changed(di, di->ac_chg.psy);
2574 }
2575
2576 /**
2577  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2578  * @work:       pointer to the work_struct structure
2579  *
2580  * Work queue function for checking the USB thermal prot status
2581  */
2582 static void ab8500_charger_check_usb_thermal_prot_work(
2583         struct work_struct *work)
2584 {
2585         int ret;
2586         u8 reg_value;
2587
2588         struct ab8500_charger *di = container_of(work,
2589                 struct ab8500_charger, check_usb_thermal_prot_work);
2590
2591         /* Check if the status bit for usb_thermal_prot is still active */
2592         ret = abx500_get_register_interruptible(di->dev,
2593                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2594         if (ret < 0) {
2595                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2596                 return;
2597         }
2598         if (reg_value & USB_CH_TH_PROT)
2599                 di->flags.usb_thermal_prot = true;
2600         else
2601                 di->flags.usb_thermal_prot = false;
2602
2603         ab8500_power_supply_changed(di, di->usb_chg.psy);
2604 }
2605
2606 /**
2607  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2608  * @irq:       interrupt number
2609  * @_di:       pointer to the ab8500_charger structure
2610  *
2611  * Returns IRQ status(IRQ_HANDLED)
2612  */
2613 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2614 {
2615         struct ab8500_charger *di = _di;
2616
2617         dev_dbg(di->dev, "Main charger unplugged\n");
2618         queue_work(di->charger_wq, &di->ac_work);
2619
2620         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2621         mutex_lock(&di->charger_attached_mutex);
2622         mutex_unlock(&di->charger_attached_mutex);
2623
2624         return IRQ_HANDLED;
2625 }
2626
2627 /**
2628  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2629  * @irq:       interrupt number
2630  * @_di:       pointer to the ab8500_charger structure
2631  *
2632  * Returns IRQ status(IRQ_HANDLED)
2633  */
2634 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2635 {
2636         struct ab8500_charger *di = _di;
2637
2638         dev_dbg(di->dev, "Main charger plugged\n");
2639         queue_work(di->charger_wq, &di->ac_work);
2640
2641         mutex_lock(&di->charger_attached_mutex);
2642         mutex_unlock(&di->charger_attached_mutex);
2643
2644         if (is_ab8500(di->parent))
2645                 queue_delayed_work(di->charger_wq,
2646                            &di->ac_charger_attached_work,
2647                            HZ);
2648         return IRQ_HANDLED;
2649 }
2650
2651 /**
2652  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2653  * @irq:       interrupt number
2654  * @_di:       pointer to the ab8500_charger structure
2655  *
2656  * Returns IRQ status(IRQ_HANDLED)
2657  */
2658 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2659 {
2660         struct ab8500_charger *di = _di;
2661
2662         dev_dbg(di->dev, "Main charger not ok\n");
2663         di->flags.mainextchnotok = true;
2664         ab8500_power_supply_changed(di, di->ac_chg.psy);
2665
2666         /* Schedule a new HW failure check */
2667         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2668
2669         return IRQ_HANDLED;
2670 }
2671
2672 /**
2673  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2674  * thermal protection threshold
2675  * @irq:       interrupt number
2676  * @_di:       pointer to the ab8500_charger structure
2677  *
2678  * Returns IRQ status(IRQ_HANDLED)
2679  */
2680 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2681 {
2682         struct ab8500_charger *di = _di;
2683
2684         dev_dbg(di->dev,
2685                 "Die temp above Main charger thermal protection threshold\n");
2686         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2687
2688         return IRQ_HANDLED;
2689 }
2690
2691 /**
2692  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2693  * thermal protection threshold
2694  * @irq:       interrupt number
2695  * @_di:       pointer to the ab8500_charger structure
2696  *
2697  * Returns IRQ status(IRQ_HANDLED)
2698  */
2699 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2700 {
2701         struct ab8500_charger *di = _di;
2702
2703         dev_dbg(di->dev,
2704                 "Die temp ok for Main charger thermal protection threshold\n");
2705         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2706
2707         return IRQ_HANDLED;
2708 }
2709
2710 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2711 {
2712         struct ab8500_charger *di = container_of(work,
2713                 struct ab8500_charger, vbus_drop_end_work.work);
2714         int ret, curr;
2715         u8 reg_value;
2716
2717         di->flags.vbus_drop_end = false;
2718
2719         /* Reset the drop counter */
2720         abx500_set_register_interruptible(di->dev,
2721                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2722
2723         if (is_ab8540(di->parent))
2724                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2725                                 AB8540_CH_USBCH_STAT3_REG, &reg_value);
2726         else
2727                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2728                                 AB8500_CH_USBCH_STAT2_REG, &reg_value);
2729         if (ret < 0) {
2730                 dev_err(di->dev, "%s read failed\n", __func__);
2731                 return;
2732         }
2733
2734         if (is_ab8540(di->parent))
2735                 curr = di->bm->chg_input_curr[
2736                         reg_value & AB8540_AUTO_VBUS_IN_CURR_MASK];
2737         else
2738                 curr = di->bm->chg_input_curr[
2739                         reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2740
2741         if (di->max_usb_in_curr.calculated_max != curr) {
2742                 /* USB source is collapsing */
2743                 di->max_usb_in_curr.calculated_max = curr;
2744                 dev_dbg(di->dev,
2745                          "VBUS input current limiting to %d mA\n",
2746                          di->max_usb_in_curr.calculated_max);
2747         } else {
2748                 /*
2749                  * USB source can not give more than this amount.
2750                  * Taking more will collapse the source.
2751                  */
2752                 di->max_usb_in_curr.set_max =
2753                         di->max_usb_in_curr.calculated_max;
2754                 dev_dbg(di->dev,
2755                          "VBUS input current limited to %d mA\n",
2756                          di->max_usb_in_curr.set_max);
2757         }
2758
2759         if (di->usb.charger_connected)
2760                 ab8500_charger_set_vbus_in_curr(di,
2761                                         di->max_usb_in_curr.usb_type_max);
2762 }
2763
2764 /**
2765  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2766  * @irq:       interrupt number
2767  * @_di:       pointer to the ab8500_charger structure
2768  *
2769  * Returns IRQ status(IRQ_HANDLED)
2770  */
2771 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2772 {
2773         struct ab8500_charger *di = _di;
2774
2775         di->vbus_detected = false;
2776         dev_dbg(di->dev, "VBUS falling detected\n");
2777         queue_work(di->charger_wq, &di->detect_usb_type_work);
2778
2779         return IRQ_HANDLED;
2780 }
2781
2782 /**
2783  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2784  * @irq:       interrupt number
2785  * @_di:       pointer to the ab8500_charger structure
2786  *
2787  * Returns IRQ status(IRQ_HANDLED)
2788  */
2789 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2790 {
2791         struct ab8500_charger *di = _di;
2792
2793         di->vbus_detected = true;
2794         dev_dbg(di->dev, "VBUS rising detected\n");
2795
2796         queue_work(di->charger_wq, &di->detect_usb_type_work);
2797
2798         return IRQ_HANDLED;
2799 }
2800
2801 /**
2802  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2803  * @irq:       interrupt number
2804  * @_di:       pointer to the ab8500_charger structure
2805  *
2806  * Returns IRQ status(IRQ_HANDLED)
2807  */
2808 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2809 {
2810         struct ab8500_charger *di = _di;
2811
2812         dev_dbg(di->dev, "USB link status changed\n");
2813
2814         queue_work(di->charger_wq, &di->usb_link_status_work);
2815
2816         return IRQ_HANDLED;
2817 }
2818
2819 /**
2820  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2821  * thermal protection threshold
2822  * @irq:       interrupt number
2823  * @_di:       pointer to the ab8500_charger structure
2824  *
2825  * Returns IRQ status(IRQ_HANDLED)
2826  */
2827 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2828 {
2829         struct ab8500_charger *di = _di;
2830
2831         dev_dbg(di->dev,
2832                 "Die temp above USB charger thermal protection threshold\n");
2833         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2834
2835         return IRQ_HANDLED;
2836 }
2837
2838 /**
2839  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2840  * thermal protection threshold
2841  * @irq:       interrupt number
2842  * @_di:       pointer to the ab8500_charger structure
2843  *
2844  * Returns IRQ status(IRQ_HANDLED)
2845  */
2846 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2847 {
2848         struct ab8500_charger *di = _di;
2849
2850         dev_dbg(di->dev,
2851                 "Die temp ok for USB charger thermal protection threshold\n");
2852         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2853
2854         return IRQ_HANDLED;
2855 }
2856
2857 /**
2858  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2859  * @irq:       interrupt number
2860  * @_di:       pointer to the ab8500_charger structure
2861  *
2862  * Returns IRQ status(IRQ_HANDLED)
2863  */
2864 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2865 {
2866         struct ab8500_charger *di = _di;
2867
2868         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2869         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2870
2871         return IRQ_HANDLED;
2872 }
2873
2874 /**
2875  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2876  * @irq:       interrupt number
2877  * @_di:       pointer to the ab8500_charger structure
2878  *
2879  * Returns IRQ status(IRQ_HANDLED)
2880  */
2881 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2882 {
2883         struct ab8500_charger *di = _di;
2884
2885         dev_dbg(di->dev, "Charger watchdog expired\n");
2886
2887         /*
2888          * The charger that was online when the watchdog expired
2889          * needs to be restarted for charging to start again
2890          */
2891         if (di->ac.charger_online) {
2892                 di->ac.wd_expired = true;
2893                 ab8500_power_supply_changed(di, di->ac_chg.psy);
2894         }
2895         if (di->usb.charger_online) {
2896                 di->usb.wd_expired = true;
2897                 ab8500_power_supply_changed(di, di->usb_chg.psy);
2898         }
2899
2900         return IRQ_HANDLED;
2901 }
2902
2903 /**
2904  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2905  * @irq:       interrupt number
2906  * @_di:       pointer to the ab8500_charger structure
2907  *
2908  * Returns IRQ status(IRQ_HANDLED)
2909  */
2910 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2911 {
2912         struct ab8500_charger *di = _di;
2913
2914         dev_dbg(di->dev, "VBUS charger drop ended\n");
2915         di->flags.vbus_drop_end = true;
2916
2917         /*
2918          * VBUS might have dropped due to bad connection.
2919          * Schedule a new input limit set to the value SW requests.
2920          */
2921         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2922                            round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2923
2924         return IRQ_HANDLED;
2925 }
2926
2927 /**
2928  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2929  * @irq:       interrupt number
2930  * @_di:       pointer to the ab8500_charger structure
2931  *
2932  * Returns IRQ status(IRQ_HANDLED)
2933  */
2934 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2935 {
2936         struct ab8500_charger *di = _di;
2937
2938         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2939         di->flags.vbus_ovv = true;
2940         ab8500_power_supply_changed(di, di->usb_chg.psy);
2941
2942         /* Schedule a new HW failure check */
2943         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2944
2945         return IRQ_HANDLED;
2946 }
2947
2948 /**
2949  * ab8500_charger_ac_get_property() - get the ac/mains properties
2950  * @psy:       pointer to the power_supply structure
2951  * @psp:       pointer to the power_supply_property structure
2952  * @val:       pointer to the power_supply_propval union
2953  *
2954  * This function gets called when an application tries to get the ac/mains
2955  * properties by reading the sysfs files.
2956  * AC/Mains properties are online, present and voltage.
2957  * online:     ac/mains charging is in progress or not
2958  * present:    presence of the ac/mains
2959  * voltage:    AC/Mains voltage
2960  * Returns error code in case of failure else 0(on success)
2961  */
2962 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2963         enum power_supply_property psp,
2964         union power_supply_propval *val)
2965 {
2966         struct ab8500_charger *di;
2967         int ret;
2968
2969         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2970
2971         switch (psp) {
2972         case POWER_SUPPLY_PROP_HEALTH:
2973                 if (di->flags.mainextchnotok)
2974                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2975                 else if (di->ac.wd_expired || di->usb.wd_expired)
2976                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2977                 else if (di->flags.main_thermal_prot)
2978                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2979                 else
2980                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2981                 break;
2982         case POWER_SUPPLY_PROP_ONLINE:
2983                 val->intval = di->ac.charger_online;
2984                 break;
2985         case POWER_SUPPLY_PROP_PRESENT:
2986                 val->intval = di->ac.charger_connected;
2987                 break;
2988         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2989                 ret = ab8500_charger_get_ac_voltage(di);
2990                 if (ret >= 0)
2991                         di->ac.charger_voltage = ret;
2992                 /* On error, use previous value */
2993                 val->intval = di->ac.charger_voltage * 1000;
2994                 break;
2995         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2996                 /*
2997                  * This property is used to indicate when CV mode is entered
2998                  * for the AC charger
2999                  */
3000                 di->ac.cv_active = ab8500_charger_ac_cv(di);
3001                 val->intval = di->ac.cv_active;
3002                 break;
3003         case POWER_SUPPLY_PROP_CURRENT_NOW:
3004                 ret = ab8500_charger_get_ac_current(di);
3005                 if (ret >= 0)
3006                         di->ac.charger_current = ret;
3007                 val->intval = di->ac.charger_current * 1000;
3008                 break;
3009         default:
3010                 return -EINVAL;
3011         }
3012         return 0;
3013 }
3014
3015 /**
3016  * ab8500_charger_usb_get_property() - get the usb properties
3017  * @psy:        pointer to the power_supply structure
3018  * @psp:        pointer to the power_supply_property structure
3019  * @val:        pointer to the power_supply_propval union
3020  *
3021  * This function gets called when an application tries to get the usb
3022  * properties by reading the sysfs files.
3023  * USB properties are online, present and voltage.
3024  * online:     usb charging is in progress or not
3025  * present:    presence of the usb
3026  * voltage:    vbus voltage
3027  * Returns error code in case of failure else 0(on success)
3028  */
3029 static int ab8500_charger_usb_get_property(struct power_supply *psy,
3030         enum power_supply_property psp,
3031         union power_supply_propval *val)
3032 {
3033         struct ab8500_charger *di;
3034         int ret;
3035
3036         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
3037
3038         switch (psp) {
3039         case POWER_SUPPLY_PROP_HEALTH:
3040                 if (di->flags.usbchargernotok)
3041                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
3042                 else if (di->ac.wd_expired || di->usb.wd_expired)
3043                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
3044                 else if (di->flags.usb_thermal_prot)
3045                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
3046                 else if (di->flags.vbus_ovv)
3047                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
3048                 else
3049                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
3050                 break;
3051         case POWER_SUPPLY_PROP_ONLINE:
3052                 val->intval = di->usb.charger_online;
3053                 break;
3054         case POWER_SUPPLY_PROP_PRESENT:
3055                 val->intval = di->usb.charger_connected;
3056                 break;
3057         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
3058                 ret = ab8500_charger_get_vbus_voltage(di);
3059                 if (ret >= 0)
3060                         di->usb.charger_voltage = ret;
3061                 val->intval = di->usb.charger_voltage * 1000;
3062                 break;
3063         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
3064                 /*
3065                  * This property is used to indicate when CV mode is entered
3066                  * for the USB charger
3067                  */
3068                 di->usb.cv_active = ab8500_charger_usb_cv(di);
3069                 val->intval = di->usb.cv_active;
3070                 break;
3071         case POWER_SUPPLY_PROP_CURRENT_NOW:
3072                 ret = ab8500_charger_get_usb_current(di);
3073                 if (ret >= 0)
3074                         di->usb.charger_current = ret;
3075                 val->intval = di->usb.charger_current * 1000;
3076                 break;
3077         case POWER_SUPPLY_PROP_CURRENT_AVG:
3078                 /*
3079                  * This property is used to indicate when VBUS has collapsed
3080                  * due to too high output current from the USB charger
3081                  */
3082                 if (di->flags.vbus_collapse)
3083                         val->intval = 1;
3084                 else
3085                         val->intval = 0;
3086                 break;
3087         default:
3088                 return -EINVAL;
3089         }
3090         return 0;
3091 }
3092
3093 /**
3094  * ab8500_charger_init_hw_registers() - Set up charger related registers
3095  * @di:         pointer to the ab8500_charger structure
3096  *
3097  * Set up charger OVV, watchdog and maximum voltage registers as well as
3098  * charging of the backup battery
3099  */
3100 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3101 {
3102         int ret = 0;
3103         u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3104
3105         /* Setup maximum charger current and voltage for ABB cut2.0 */
3106         if (!is_ab8500_1p1_or_earlier(di->parent)) {
3107                 ret = abx500_set_register_interruptible(di->dev,
3108                         AB8500_CHARGER,
3109                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3110                 if (ret) {
3111                         dev_err(di->dev,
3112                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
3113                         goto out;
3114                 }
3115
3116                 if (is_ab8540(di->parent))
3117                         ret = abx500_set_register_interruptible(di->dev,
3118                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3119                                 CH_OP_CUR_LVL_2P);
3120                 else
3121                         ret = abx500_set_register_interruptible(di->dev,
3122                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3123                                 CH_OP_CUR_LVL_1P6);
3124                 if (ret) {
3125                         dev_err(di->dev,
3126                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3127                         goto out;
3128                 }
3129         }
3130
3131         if (is_ab9540_2p0(di->parent) || is_ab9540_3p0(di->parent)
3132          || is_ab8505_2p0(di->parent) || is_ab8540(di->parent))
3133                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3134                         AB8500_CHARGER,
3135                         AB8500_USBCH_CTRL2_REG,
3136                         VBUS_AUTO_IN_CURR_LIM_ENA,
3137                         VBUS_AUTO_IN_CURR_LIM_ENA);
3138         else
3139                 /*
3140                  * VBUS OVV set to 6.3V and enable automatic current limitation
3141                  */
3142                 ret = abx500_set_register_interruptible(di->dev,
3143                         AB8500_CHARGER,
3144                         AB8500_USBCH_CTRL2_REG,
3145                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3146         if (ret) {
3147                 dev_err(di->dev,
3148                         "failed to set automatic current limitation\n");
3149                 goto out;
3150         }
3151
3152         /* Enable main watchdog in OTP */
3153         ret = abx500_set_register_interruptible(di->dev,
3154                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3155         if (ret) {
3156                 dev_err(di->dev, "failed to enable main WD in OTP\n");
3157                 goto out;
3158         }
3159
3160         /* Enable main watchdog */
3161         ret = abx500_set_register_interruptible(di->dev,
3162                 AB8500_SYS_CTRL2_BLOCK,
3163                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3164         if (ret) {
3165                 dev_err(di->dev, "faile to enable main watchdog\n");
3166                 goto out;
3167         }
3168
3169         /*
3170          * Due to internal synchronisation, Enable and Kick watchdog bits
3171          * cannot be enabled in a single write.
3172          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3173          * between writing Enable then Kick bits.
3174          */
3175         udelay(63);
3176
3177         /* Kick main watchdog */
3178         ret = abx500_set_register_interruptible(di->dev,
3179                 AB8500_SYS_CTRL2_BLOCK,
3180                 AB8500_MAIN_WDOG_CTRL_REG,
3181                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3182         if (ret) {
3183                 dev_err(di->dev, "failed to kick main watchdog\n");
3184                 goto out;
3185         }
3186
3187         /* Disable main watchdog */
3188         ret = abx500_set_register_interruptible(di->dev,
3189                 AB8500_SYS_CTRL2_BLOCK,
3190                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3191         if (ret) {
3192                 dev_err(di->dev, "failed to disable main watchdog\n");
3193                 goto out;
3194         }
3195
3196         /* Set watchdog timeout */
3197         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3198                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3199         if (ret) {
3200                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3201                 goto out;
3202         }
3203
3204         ret = ab8500_charger_led_en(di, false);
3205         if (ret < 0) {
3206                 dev_err(di->dev, "failed to disable LED\n");
3207                 goto out;
3208         }
3209
3210         /* Backup battery voltage and current */
3211         if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3212                 bup_vch_range = BUP_VCH_RANGE;
3213         if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3214                 vbup33_vrtcn = VBUP33_VRTCN;
3215
3216         ret = abx500_set_register_interruptible(di->dev,
3217                 AB8500_RTC,
3218                 AB8500_RTC_BACKUP_CHG_REG,
3219                 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3220         if (ret) {
3221                 dev_err(di->dev, "failed to setup backup battery charging\n");
3222                 goto out;
3223         }
3224         if (is_ab8540(di->parent)) {
3225                 ret = abx500_set_register_interruptible(di->dev,
3226                         AB8500_RTC,
3227                         AB8500_RTC_CTRL1_REG,
3228                         bup_vch_range | vbup33_vrtcn);
3229                 if (ret) {
3230                         dev_err(di->dev,
3231                                 "failed to setup backup battery charging\n");
3232                         goto out;
3233                 }
3234         }
3235
3236         /* Enable backup battery charging */
3237         ret = abx500_mask_and_set_register_interruptible(di->dev,
3238                 AB8500_RTC, AB8500_RTC_CTRL_REG,
3239                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3240         if (ret < 0) {
3241                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3242                 goto out;
3243         }
3244
3245         if (is_ab8540(di->parent)) {
3246                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3247                         AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
3248                         BUS_VSYS_VOL_SELECT_MASK, BUS_VSYS_VOL_SELECT_3P6V);
3249                 if (ret) {
3250                         dev_err(di->dev,
3251                                 "failed to setup usb power path vsys voltage\n");
3252                         goto out;
3253                 }
3254                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3255                         AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
3256                         BUS_PP_PRECHG_CURRENT_MASK, 0);
3257                 if (ret) {
3258                         dev_err(di->dev,
3259                                 "failed to setup usb power path prechage current\n");
3260                         goto out;
3261                 }
3262         }
3263
3264 out:
3265         return ret;
3266 }
3267
3268 /*
3269  * ab8500 charger driver interrupts and their respective isr
3270  */
3271 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3272         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3273         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3274         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3275         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3276         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3277         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3278         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3279         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3280         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3281         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3282         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3283         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3284         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3285         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3286 };
3287
3288 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3289                 unsigned long event, void *power)
3290 {
3291         struct ab8500_charger *di =
3292                 container_of(nb, struct ab8500_charger, nb);
3293         enum ab8500_usb_state bm_usb_state;
3294         unsigned mA = *((unsigned *)power);
3295
3296         if (!di)
3297                 return NOTIFY_DONE;
3298
3299         if (event != USB_EVENT_VBUS) {
3300                 dev_dbg(di->dev, "not a standard host, returning\n");
3301                 return NOTIFY_DONE;
3302         }
3303
3304         /* TODO: State is fabricate  here. See if charger really needs USB
3305          * state or if mA is enough
3306          */
3307         if ((di->usb_state.usb_current == 2) && (mA > 2))
3308                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3309         else if (mA == 0)
3310                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3311         else if (mA == 2)
3312                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3313         else if (mA >= 8) /* 8, 100, 500 */
3314                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3315         else /* Should never occur */
3316                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3317
3318         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3319                 __func__, bm_usb_state, mA);
3320
3321         spin_lock(&di->usb_state.usb_lock);
3322         di->usb_state.state_tmp = bm_usb_state;
3323         di->usb_state.usb_current_tmp = mA;
3324         spin_unlock(&di->usb_state.usb_lock);
3325
3326         /*
3327          * wait for some time until you get updates from the usb stack
3328          * and negotiations are completed
3329          */
3330         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3331
3332         return NOTIFY_OK;
3333 }
3334
3335 #if defined(CONFIG_PM)
3336 static int ab8500_charger_resume(struct platform_device *pdev)
3337 {
3338         int ret;
3339         struct ab8500_charger *di = platform_get_drvdata(pdev);
3340
3341         /*
3342          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3343          * logic. That means we have to continously kick the charger
3344          * watchdog even when no charger is connected. This is only
3345          * valid once the AC charger has been enabled. This is
3346          * a bug that is not handled by the algorithm and the
3347          * watchdog have to be kicked by the charger driver
3348          * when the AC charger is disabled
3349          */
3350         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3351                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3352                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3353                 if (ret)
3354                         dev_err(di->dev, "Failed to kick WD!\n");
3355
3356                 /* If not already pending start a new timer */
3357                 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3358                                    round_jiffies(WD_KICK_INTERVAL));
3359         }
3360
3361         /* If we still have a HW failure, schedule a new check */
3362         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3363                 queue_delayed_work(di->charger_wq,
3364                         &di->check_hw_failure_work, 0);
3365         }
3366
3367         if (di->flags.vbus_drop_end)
3368                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3369
3370         return 0;
3371 }
3372
3373 static int ab8500_charger_suspend(struct platform_device *pdev,
3374         pm_message_t state)
3375 {
3376         struct ab8500_charger *di = platform_get_drvdata(pdev);
3377
3378         /* Cancel any pending jobs */
3379         cancel_delayed_work(&di->check_hw_failure_work);
3380         cancel_delayed_work(&di->vbus_drop_end_work);
3381
3382         flush_delayed_work(&di->attach_work);
3383         flush_delayed_work(&di->usb_charger_attached_work);
3384         flush_delayed_work(&di->ac_charger_attached_work);
3385         flush_delayed_work(&di->check_usbchgnotok_work);
3386         flush_delayed_work(&di->check_vbat_work);
3387         flush_delayed_work(&di->kick_wd_work);
3388
3389         flush_work(&di->usb_link_status_work);
3390         flush_work(&di->ac_work);
3391         flush_work(&di->detect_usb_type_work);
3392
3393         if (atomic_read(&di->current_stepping_sessions))
3394                 return -EAGAIN;
3395
3396         return 0;
3397 }
3398 #else
3399 #define ab8500_charger_suspend      NULL
3400 #define ab8500_charger_resume       NULL
3401 #endif
3402
3403 static struct notifier_block charger_nb = {
3404         .notifier_call = ab8500_external_charger_prepare,
3405 };
3406
3407 static int ab8500_charger_remove(struct platform_device *pdev)
3408 {
3409         struct ab8500_charger *di = platform_get_drvdata(pdev);
3410         int i, irq, ret;
3411
3412         /* Disable AC charging */
3413         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3414
3415         /* Disable USB charging */
3416         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3417
3418         /* Disable interrupts */
3419         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3420                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3421                 free_irq(irq, di);
3422         }
3423
3424         /* Backup battery voltage and current disable */
3425         ret = abx500_mask_and_set_register_interruptible(di->dev,
3426                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3427         if (ret < 0)
3428                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3429
3430         usb_unregister_notifier(di->usb_phy, &di->nb);
3431         usb_put_phy(di->usb_phy);
3432
3433         /* Delete the work queue */
3434         destroy_workqueue(di->charger_wq);
3435
3436         /* Unregister external charger enable notifier */
3437         if (!di->ac_chg.enabled)
3438                 blocking_notifier_chain_unregister(
3439                         &charger_notifier_list, &charger_nb);
3440
3441         flush_scheduled_work();
3442         if (di->usb_chg.enabled)
3443                 power_supply_unregister(di->usb_chg.psy);
3444
3445         if (di->ac_chg.enabled && !di->ac_chg.external)
3446                 power_supply_unregister(di->ac_chg.psy);
3447
3448         return 0;
3449 }
3450
3451 static char *supply_interface[] = {
3452         "ab8500_chargalg",
3453         "ab8500_fg",
3454         "ab8500_btemp",
3455 };
3456
3457 static const struct power_supply_desc ab8500_ac_chg_desc = {
3458         .name           = "ab8500_ac",
3459         .type           = POWER_SUPPLY_TYPE_MAINS,
3460         .properties     = ab8500_charger_ac_props,
3461         .num_properties = ARRAY_SIZE(ab8500_charger_ac_props),
3462         .get_property   = ab8500_charger_ac_get_property,
3463 };
3464
3465 static const struct power_supply_desc ab8500_usb_chg_desc = {
3466         .name           = "ab8500_usb",
3467         .type           = POWER_SUPPLY_TYPE_USB,
3468         .properties     = ab8500_charger_usb_props,
3469         .num_properties = ARRAY_SIZE(ab8500_charger_usb_props),
3470         .get_property   = ab8500_charger_usb_get_property,
3471 };
3472
3473 static int ab8500_charger_probe(struct platform_device *pdev)
3474 {
3475         struct device_node *np = pdev->dev.of_node;
3476         struct abx500_bm_data *plat = pdev->dev.platform_data;
3477         struct power_supply_config ac_psy_cfg = {}, usb_psy_cfg = {};
3478         struct ab8500_charger *di;
3479         int irq, i, charger_status, ret = 0, ch_stat;
3480
3481         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3482         if (!di) {
3483                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3484                 return -ENOMEM;
3485         }
3486
3487         if (!plat) {
3488                 dev_err(&pdev->dev, "no battery management data supplied\n");
3489                 return -EINVAL;
3490         }
3491         di->bm = plat;
3492
3493         if (np) {
3494                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3495                 if (ret) {
3496                         dev_err(&pdev->dev, "failed to get battery information\n");
3497                         return ret;
3498                 }
3499                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3500         } else
3501                 di->autopower_cfg = false;
3502
3503         /* get parent data */
3504         di->dev = &pdev->dev;
3505         di->parent = dev_get_drvdata(pdev->dev.parent);
3506         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3507
3508         /* initialize lock */
3509         spin_lock_init(&di->usb_state.usb_lock);
3510         mutex_init(&di->usb_ipt_crnt_lock);
3511
3512         di->autopower = false;
3513         di->invalid_charger_detect_state = 0;
3514
3515         /* AC and USB supply config */
3516         ac_psy_cfg.supplied_to = supply_interface;
3517         ac_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3518         ac_psy_cfg.drv_data = &di->ac_chg;
3519         usb_psy_cfg.supplied_to = supply_interface;
3520         usb_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3521         usb_psy_cfg.drv_data = &di->usb_chg;
3522
3523         /* AC supply */
3524         /* ux500_charger sub-class */
3525         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3526         di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3527         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3528         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3529         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3530                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3531         di->ac_chg.max_out_curr =
3532                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3533         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3534         di->ac_chg.enabled = di->bm->ac_enabled;
3535         di->ac_chg.external = false;
3536
3537         /*notifier for external charger enabling*/
3538         if (!di->ac_chg.enabled)
3539                 blocking_notifier_chain_register(
3540                         &charger_notifier_list, &charger_nb);
3541
3542         /* USB supply */
3543         /* ux500_charger sub-class */
3544         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3545         di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3546         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3547         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3548         di->usb_chg.ops.pp_enable = &ab8540_charger_power_path_enable;
3549         di->usb_chg.ops.pre_chg_enable = &ab8540_charger_usb_pre_chg_enable;
3550         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3551                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3552         di->usb_chg.max_out_curr =
3553                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3554         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3555         di->usb_chg.enabled = di->bm->usb_enabled;
3556         di->usb_chg.external = false;
3557         di->usb_chg.power_path = di->bm->usb_power_path;
3558         di->usb_state.usb_current = -1;
3559
3560         /* Create a work queue for the charger */
3561         di->charger_wq = alloc_ordered_workqueue("ab8500_charger_wq",
3562                                                  WQ_MEM_RECLAIM);
3563         if (di->charger_wq == NULL) {
3564                 dev_err(di->dev, "failed to create work queue\n");
3565                 return -ENOMEM;
3566         }
3567
3568         mutex_init(&di->charger_attached_mutex);
3569
3570         /* Init work for HW failure check */
3571         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3572                 ab8500_charger_check_hw_failure_work);
3573         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3574                 ab8500_charger_check_usbchargernotok_work);
3575
3576         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3577                           ab8500_charger_ac_attached_work);
3578         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3579                           ab8500_charger_usb_attached_work);
3580
3581         /*
3582          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3583          * logic. That means we have to continously kick the charger
3584          * watchdog even when no charger is connected. This is only
3585          * valid once the AC charger has been enabled. This is
3586          * a bug that is not handled by the algorithm and the
3587          * watchdog have to be kicked by the charger driver
3588          * when the AC charger is disabled
3589          */
3590         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3591                 ab8500_charger_kick_watchdog_work);
3592
3593         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3594                 ab8500_charger_check_vbat_work);
3595
3596         INIT_DELAYED_WORK(&di->attach_work,
3597                 ab8500_charger_usb_link_attach_work);
3598
3599         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3600                 ab8500_charger_usb_state_changed_work);
3601
3602         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3603                 ab8500_charger_vbus_drop_end_work);
3604
3605         /* Init work for charger detection */
3606         INIT_WORK(&di->usb_link_status_work,
3607                 ab8500_charger_usb_link_status_work);
3608         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3609         INIT_WORK(&di->detect_usb_type_work,
3610                 ab8500_charger_detect_usb_type_work);
3611
3612         /* Init work for checking HW status */
3613         INIT_WORK(&di->check_main_thermal_prot_work,
3614                 ab8500_charger_check_main_thermal_prot_work);
3615         INIT_WORK(&di->check_usb_thermal_prot_work,
3616                 ab8500_charger_check_usb_thermal_prot_work);
3617
3618         /*
3619          * VDD ADC supply needs to be enabled from this driver when there
3620          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3621          * interrupts during charging
3622          */
3623         di->regu = devm_regulator_get(di->dev, "vddadc");
3624         if (IS_ERR(di->regu)) {
3625                 ret = PTR_ERR(di->regu);
3626                 dev_err(di->dev, "failed to get vddadc regulator\n");
3627                 goto free_charger_wq;
3628         }
3629
3630
3631         /* Initialize OVV, and other registers */
3632         ret = ab8500_charger_init_hw_registers(di);
3633         if (ret) {
3634                 dev_err(di->dev, "failed to initialize ABB registers\n");
3635                 goto free_charger_wq;
3636         }
3637
3638         /* Register AC charger class */
3639         if (di->ac_chg.enabled) {
3640                 di->ac_chg.psy = power_supply_register(di->dev,
3641                                                        &ab8500_ac_chg_desc,
3642                                                        &ac_psy_cfg);
3643                 if (IS_ERR(di->ac_chg.psy)) {
3644                         dev_err(di->dev, "failed to register AC charger\n");
3645                         ret = PTR_ERR(di->ac_chg.psy);
3646                         goto free_charger_wq;
3647                 }
3648         }
3649
3650         /* Register USB charger class */
3651         if (di->usb_chg.enabled) {
3652                 di->usb_chg.psy = power_supply_register(di->dev,
3653                                                         &ab8500_usb_chg_desc,
3654                                                         &usb_psy_cfg);
3655                 if (IS_ERR(di->usb_chg.psy)) {
3656                         dev_err(di->dev, "failed to register USB charger\n");
3657                         ret = PTR_ERR(di->usb_chg.psy);
3658                         goto free_ac;
3659                 }
3660         }
3661
3662         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3663         if (IS_ERR_OR_NULL(di->usb_phy)) {
3664                 dev_err(di->dev, "failed to get usb transceiver\n");
3665                 ret = -EINVAL;
3666                 goto free_usb;
3667         }
3668         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3669         ret = usb_register_notifier(di->usb_phy, &di->nb);
3670         if (ret) {
3671                 dev_err(di->dev, "failed to register usb notifier\n");
3672                 goto put_usb_phy;
3673         }
3674
3675         /* Identify the connected charger types during startup */
3676         charger_status = ab8500_charger_detect_chargers(di, true);
3677         if (charger_status & AC_PW_CONN) {
3678                 di->ac.charger_connected = 1;
3679                 di->ac_conn = true;
3680                 ab8500_power_supply_changed(di, di->ac_chg.psy);
3681                 sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
3682         }
3683
3684         if (charger_status & USB_PW_CONN) {
3685                 di->vbus_detected = true;
3686                 di->vbus_detected_start = true;
3687                 queue_work(di->charger_wq,
3688                         &di->detect_usb_type_work);
3689         }
3690
3691         /* Register interrupts */
3692         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3693                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3694                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3695                         IRQF_SHARED | IRQF_NO_SUSPEND,
3696                         ab8500_charger_irq[i].name, di);
3697
3698                 if (ret != 0) {
3699                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3700                                 , ab8500_charger_irq[i].name, irq, ret);
3701                         goto free_irq;
3702                 }
3703                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3704                         ab8500_charger_irq[i].name, irq, ret);
3705         }
3706
3707         platform_set_drvdata(pdev, di);
3708
3709         mutex_lock(&di->charger_attached_mutex);
3710
3711         ch_stat = ab8500_charger_detect_chargers(di, false);
3712
3713         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3714                 if (is_ab8500(di->parent))
3715                         queue_delayed_work(di->charger_wq,
3716                                            &di->ac_charger_attached_work,
3717                                            HZ);
3718         }
3719         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3720                 if (is_ab8500(di->parent))
3721                         queue_delayed_work(di->charger_wq,
3722                                            &di->usb_charger_attached_work,
3723                                            HZ);
3724         }
3725
3726         mutex_unlock(&di->charger_attached_mutex);
3727
3728         return ret;
3729
3730 free_irq:
3731         usb_unregister_notifier(di->usb_phy, &di->nb);
3732
3733         /* We also have to free all successfully registered irqs */
3734         for (i = i - 1; i >= 0; i--) {
3735                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3736                 free_irq(irq, di);
3737         }
3738 put_usb_phy:
3739         usb_put_phy(di->usb_phy);
3740 free_usb:
3741         if (di->usb_chg.enabled)
3742                 power_supply_unregister(di->usb_chg.psy);
3743 free_ac:
3744         if (di->ac_chg.enabled)
3745                 power_supply_unregister(di->ac_chg.psy);
3746 free_charger_wq:
3747         destroy_workqueue(di->charger_wq);
3748         return ret;
3749 }
3750
3751 static const struct of_device_id ab8500_charger_match[] = {
3752         { .compatible = "stericsson,ab8500-charger", },
3753         { },
3754 };
3755 MODULE_DEVICE_TABLE(of, ab8500_charger_match);
3756
3757 static struct platform_driver ab8500_charger_driver = {
3758         .probe = ab8500_charger_probe,
3759         .remove = ab8500_charger_remove,
3760         .suspend = ab8500_charger_suspend,
3761         .resume = ab8500_charger_resume,
3762         .driver = {
3763                 .name = "ab8500-charger",
3764                 .of_match_table = ab8500_charger_match,
3765         },
3766 };
3767
3768 static int __init ab8500_charger_init(void)
3769 {
3770         return platform_driver_register(&ab8500_charger_driver);
3771 }
3772
3773 static void __exit ab8500_charger_exit(void)
3774 {
3775         platform_driver_unregister(&ab8500_charger_driver);
3776 }
3777
3778 subsys_initcall_sync(ab8500_charger_init);
3779 module_exit(ab8500_charger_exit);
3780
3781 MODULE_LICENSE("GPL v2");
3782 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3783 MODULE_ALIAS("platform:ab8500-charger");
3784 MODULE_DESCRIPTION("AB8500 charger management driver");