drivers/power/supply/axp288_fuel_gauge.c

   1 /*
   2  * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
   3  *
   4  * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
   5  * Copyright (C) 2014 Intel Corporation
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; version 2 of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/dmi.h>
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/device.h>
  24 #include <linux/regmap.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/mfd/axp20x.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/power_supply.h>
  30 #include <linux/iio/consumer.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/seq_file.h>
  33 #include <asm/unaligned.h>
  34
  35 #define PS_STAT_VBUS_TRIGGER            (1 << 0)
  36 #define PS_STAT_BAT_CHRG_DIR            (1 << 2)
  37 #define PS_STAT_VBAT_ABOVE_VHOLD        (1 << 3)
  38 #define PS_STAT_VBUS_VALID              (1 << 4)
  39 #define PS_STAT_VBUS_PRESENT            (1 << 5)
  40
  41 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  42 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  43 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  44 #define CHRG_STAT_CHARGING                      (1 << 6)
  45 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  46
  47 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  48 #define CHRG_CCCV_CC_BIT_POS            0
  49 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  50 #define CHRG_CCCV_CC_LSB_RES            200     /* 200mA */
  51 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  52 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  53 #define CHRG_CCCV_CV_BIT_POS            5
  54 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  55 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  56 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  57 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  58 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  59
  60 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  61 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  62 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  63 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  64 #define FG_CNTL_CC_EN                           (1 << 6)
  65 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  66
  67 #define FG_15BIT_WORD_VALID                     (1 << 15)
  68 #define FG_15BIT_VAL_MASK                       0x7fff
  69
  70 #define FG_REP_CAP_VALID                        (1 << 7)
  71 #define FG_REP_CAP_VAL_MASK                     0x7F
  72
  73 #define FG_DES_CAP1_VALID                       (1 << 7)
  74 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  75
  76 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  77
  78 #define FG_OCV_CAP_VALID                        (1 << 7)
  79 #define FG_OCV_CAP_VAL_MASK                     0x7F
  80 #define FG_CC_CAP_VALID                         (1 << 7)
  81 #define FG_CC_CAP_VAL_MASK                      0x7F
  82
  83 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  84 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  85 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  86 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  87 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  88 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  89
  90 #define NR_RETRY_CNT    3
  91 #define DEV_NAME        "axp288_fuel_gauge"
  92
  93 /* 1.1mV per LSB expressed in uV */
  94 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
  95 /* properties converted to uV, uA */
  96 #define PROP_VOLT(a)            ((a) * 1000)
  97 #define PROP_CURR(a)            ((a) * 1000)
  98
  99 #define AXP288_FG_INTR_NUM      6
 100 enum {
 101         QWBTU_IRQ = 0,
 102         WBTU_IRQ,
 103         QWBTO_IRQ,
 104         WBTO_IRQ,
 105         WL2_IRQ,
 106         WL1_IRQ,
 107 };
 108
 109 enum {
 110         BAT_TEMP = 0,
 111         PMIC_TEMP,
 112         SYSTEM_TEMP,
 113         BAT_CHRG_CURR,
 114         BAT_D_CURR,
 115         BAT_VOLT,
 116         IIO_CHANNEL_NUM
 117 };
 118
 119 struct axp288_fg_info {
 120         struct platform_device *pdev;
 121         struct regmap *regmap;
 122         struct regmap_irq_chip_data *regmap_irqc;
 123         int irq[AXP288_FG_INTR_NUM];
 124         struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
 125         struct power_supply *bat;
 126         struct mutex lock;
 127         int status;
 128         int max_volt;
 129         struct dentry *debug_file;
 130 };
 131
 132 static enum power_supply_property fuel_gauge_props[] = {
 133         POWER_SUPPLY_PROP_STATUS,
 134         POWER_SUPPLY_PROP_PRESENT,
 135         POWER_SUPPLY_PROP_HEALTH,
 136         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 137         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 138         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 139         POWER_SUPPLY_PROP_CURRENT_NOW,
 140         POWER_SUPPLY_PROP_CAPACITY,
 141         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 142         POWER_SUPPLY_PROP_TECHNOLOGY,
 143         POWER_SUPPLY_PROP_CHARGE_FULL,
 144         POWER_SUPPLY_PROP_CHARGE_NOW,
 145 };
 146
 147 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 148 {
 149         int ret, i;
 150         unsigned int val;
 151
 152         for (i = 0; i < NR_RETRY_CNT; i++) {
 153                 ret = regmap_read(info->regmap, reg, &val);
 154                 if (ret == -EBUSY)
 155                         continue;
 156                 else
 157                         break;
 158         }
 159
 160         if (ret < 0) {
 161                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
 162                 return ret;
 163         }
 164
 165         return val;
 166 }
 167
 168 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 169 {
 170         int ret;
 171
 172         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 173
 174         if (ret < 0)
 175                 dev_err(&info->pdev->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
 176
 177         return ret;
 178 }
 179
 180 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 181 {
 182         unsigned char buf[2];
 183         int ret;
 184
 185         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 186         if (ret < 0) {
 187                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 188                         reg, ret);
 189                 return ret;
 190         }
 191
 192         ret = get_unaligned_be16(buf);
 193         if (!(ret & FG_15BIT_WORD_VALID)) {
 194                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
 195                         reg);
 196                 return -ENXIO;
 197         }
 198
 199         return ret & FG_15BIT_VAL_MASK;
 200 }
 201
 202 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 203 {
 204         unsigned char buf[2];
 205         int ret;
 206
 207         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 208         if (ret < 0) {
 209                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 210                         reg, ret);
 211                 return ret;
 212         }
 213
 214         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 215         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 216 }
 217
 218 #ifdef CONFIG_DEBUG_FS
 219 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 220 {
 221         struct axp288_fg_info *info = s->private;
 222         int raw_val, ret;
 223
 224         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 225                 AXP20X_PWR_INPUT_STATUS,
 226                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 227         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 228                 AXP20X_PWR_OP_MODE,
 229                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 230         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 231                 AXP20X_CHRG_CTRL1,
 232                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 233         seq_printf(s, "       VLTF[%02x] : %02x\n",
 234                 AXP20X_V_LTF_DISCHRG,
 235                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 236         seq_printf(s, "       VHTF[%02x] : %02x\n",
 237                 AXP20X_V_HTF_DISCHRG,
 238                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 239         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 240                 AXP20X_CC_CTRL,
 241                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 242         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 243                 AXP20X_FG_RES,
 244                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 245         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 246                 AXP288_FG_RDC1_REG,
 247                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 248         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 249                 AXP288_FG_RDC0_REG,
 250                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 251         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
 252                 AXP288_FG_OCVH_REG,
 253                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
 254         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
 255                 AXP288_FG_DES_CAP1_REG,
 256                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
 257         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
 258                 AXP288_FG_CC_MTR1_REG,
 259                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
 260         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 261                 AXP288_FG_OCV_CAP_REG,
 262                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 263         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 264                 AXP288_FG_CC_CAP_REG,
 265                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 266         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 267                 AXP288_FG_LOW_CAP_REG,
 268                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 269         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 270                 AXP288_FG_TUNE0,
 271                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 272         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 273                 AXP288_FG_TUNE1,
 274                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 275         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 276                 AXP288_FG_TUNE2,
 277                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 278         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 279                 AXP288_FG_TUNE3,
 280                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 281         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 282                 AXP288_FG_TUNE4,
 283                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 284         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 285                 AXP288_FG_TUNE5,
 286                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 287
 288         ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val);
 289         if (ret >= 0)
 290                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 291         ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val);
 292         if (ret >= 0)
 293                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 294         ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val);
 295         if (ret >= 0)
 296                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 297         ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val);
 298         if (ret >= 0)
 299                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 300         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val);
 301         if (ret >= 0)
 302                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 303         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 304         if (ret >= 0)
 305                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 306
 307         return 0;
 308 }
 309
 310 static int debug_open(struct inode *inode, struct file *file)
 311 {
 312         return single_open(file, fuel_gauge_debug_show, inode->i_private);
 313 }
 314
 315 static const struct file_operations fg_debug_fops = {
 316         .open       = debug_open,
 317         .read       = seq_read,
 318         .llseek     = seq_lseek,
 319         .release    = single_release,
 320 };
 321
 322 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 323 {
 324         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 325                 info, &fg_debug_fops);
 326 }
 327
 328 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 329 {
 330         debugfs_remove(info->debug_file);
 331 }
 332 #else
 333 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 334 {
 335 }
 336 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 337 {
 338 }
 339 #endif
 340
 341 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 342 {
 343         int pwr_stat, fg_res, curr, ret;
 344
 345         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 346         if (pwr_stat < 0) {
 347                 dev_err(&info->pdev->dev,
 348                         "PWR STAT read failed:%d\n", pwr_stat);
 349                 return;
 350         }
 351
 352         /* Report full if Vbus is valid and the reported capacity is 100% */
 353         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 354                 goto not_full;
 355
 356         fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 357         if (fg_res < 0) {
 358                 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res);
 359                 return;
 360         }
 361         if (!(fg_res & FG_REP_CAP_VALID))
 362                 goto not_full;
 363
 364         fg_res &= ~FG_REP_CAP_VALID;
 365         if (fg_res == 100) {
 366                 info->status = POWER_SUPPLY_STATUS_FULL;
 367                 return;
 368         }
 369
 370         /*
 371          * Sometimes the charger turns itself off before fg-res reaches 100%.
 372          * When this happens the AXP288 reports a not-charging status and
 373          * 0 mA discharge current.
 374          */
 375         if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR))
 376                 goto not_full;
 377
 378         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr);
 379         if (ret < 0) {
 380                 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret);
 381                 return;
 382         }
 383         if (curr == 0) {
 384                 info->status = POWER_SUPPLY_STATUS_FULL;
 385                 return;
 386         }
 387
 388 not_full:
 389         if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
 390                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 391         else
 392                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 393 }
 394
 395 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 396 {
 397         int ret = 0, raw_val;
 398
 399         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 400         if (ret < 0)
 401                 goto vbatt_read_fail;
 402
 403         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 404 vbatt_read_fail:
 405         return ret;
 406 }
 407
 408 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 409 {
 410         int ret, discharge;
 411
 412         /* First check discharge current, so that we do only 1 read on bat. */
 413         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
 414         if (ret < 0)
 415                 return ret;
 416
 417         if (discharge > 0) {
 418                 *cur = -1 * discharge;
 419                 return 0;
 420         }
 421
 422         return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
 423 }
 424
 425 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 426 {
 427         int ret;
 428
 429         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 430         if (ret >= 0)
 431                 *vocv = VOLTAGE_FROM_ADC(ret);
 432
 433         return ret;
 434 }
 435
 436 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 437 {
 438         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 439
 440         ret = fuel_gauge_get_vocv(info, &vocv);
 441         if (ret < 0)
 442                 goto health_read_fail;
 443
 444         if (vocv > info->max_volt)
 445                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 446         else
 447                 health = POWER_SUPPLY_HEALTH_GOOD;
 448
 449 health_read_fail:
 450         return health;
 451 }
 452
 453 static int fuel_gauge_get_property(struct power_supply *ps,
 454                 enum power_supply_property prop,
 455                 union power_supply_propval *val)
 456 {
 457         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 458         int ret = 0, value;
 459
 460         mutex_lock(&info->lock);
 461         switch (prop) {
 462         case POWER_SUPPLY_PROP_STATUS:
 463                 fuel_gauge_get_status(info);
 464                 val->intval = info->status;
 465                 break;
 466         case POWER_SUPPLY_PROP_HEALTH:
 467                 val->intval = fuel_gauge_battery_health(info);
 468                 break;
 469         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 470                 ret = fuel_gauge_get_vbatt(info, &value);
 471                 if (ret < 0)
 472                         goto fuel_gauge_read_err;
 473                 val->intval = PROP_VOLT(value);
 474                 break;
 475         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 476                 ret = fuel_gauge_get_vocv(info, &value);
 477                 if (ret < 0)
 478                         goto fuel_gauge_read_err;
 479                 val->intval = PROP_VOLT(value);
 480                 break;
 481         case POWER_SUPPLY_PROP_CURRENT_NOW:
 482                 ret = fuel_gauge_get_current(info, &value);
 483                 if (ret < 0)
 484                         goto fuel_gauge_read_err;
 485                 val->intval = PROP_CURR(value);
 486                 break;
 487         case POWER_SUPPLY_PROP_PRESENT:
 488                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 489                 if (ret < 0)
 490                         goto fuel_gauge_read_err;
 491
 492                 if (ret & CHRG_STAT_BAT_PRESENT)
 493                         val->intval = 1;
 494                 else
 495                         val->intval = 0;
 496                 break;
 497         case POWER_SUPPLY_PROP_CAPACITY:
 498                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 499                 if (ret < 0)
 500                         goto fuel_gauge_read_err;
 501
 502                 if (!(ret & FG_REP_CAP_VALID))
 503                         dev_err(&info->pdev->dev,
 504                                 "capacity measurement not valid\n");
 505                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 506                 break;
 507         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 508                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 509                 if (ret < 0)
 510                         goto fuel_gauge_read_err;
 511                 val->intval = (ret & 0x0f);
 512                 break;
 513         case POWER_SUPPLY_PROP_TECHNOLOGY:
 514                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 515                 break;
 516         case POWER_SUPPLY_PROP_CHARGE_NOW:
 517                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 518                 if (ret < 0)
 519                         goto fuel_gauge_read_err;
 520
 521                 val->intval = ret * FG_DES_CAP_RES_LSB;
 522                 break;
 523         case POWER_SUPPLY_PROP_CHARGE_FULL:
 524                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 525                 if (ret < 0)
 526                         goto fuel_gauge_read_err;
 527
 528                 val->intval = ret * FG_DES_CAP_RES_LSB;
 529                 break;
 530         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 531                 val->intval = PROP_VOLT(info->max_volt);
 532                 break;
 533         default:
 534                 mutex_unlock(&info->lock);
 535                 return -EINVAL;
 536         }
 537
 538         mutex_unlock(&info->lock);
 539         return 0;
 540
 541 fuel_gauge_read_err:
 542         mutex_unlock(&info->lock);
 543         return ret;
 544 }
 545
 546 static int fuel_gauge_set_property(struct power_supply *ps,
 547                 enum power_supply_property prop,
 548                 const union power_supply_propval *val)
 549 {
 550         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 551         int ret = 0;
 552
 553         mutex_lock(&info->lock);
 554         switch (prop) {
 555         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 556                 if ((val->intval < 0) || (val->intval > 15)) {
 557                         ret = -EINVAL;
 558                         break;
 559                 }
 560                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 561                 if (ret < 0)
 562                         break;
 563                 ret &= 0xf0;
 564                 ret |= (val->intval & 0xf);
 565                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 566                 break;
 567         default:
 568                 ret = -EINVAL;
 569                 break;
 570         }
 571
 572         mutex_unlock(&info->lock);
 573         return ret;
 574 }
 575
 576 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 577         enum power_supply_property psp)
 578 {
 579         int ret;
 580
 581         switch (psp) {
 582         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 583                 ret = 1;
 584                 break;
 585         default:
 586                 ret = 0;
 587         }
 588
 589         return ret;
 590 }
 591
 592 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 593 {
 594         struct axp288_fg_info *info = dev;
 595         int i;
 596
 597         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 598                 if (info->irq[i] == irq)
 599                         break;
 600         }
 601
 602         if (i >= AXP288_FG_INTR_NUM) {
 603                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 604                 return IRQ_NONE;
 605         }
 606
 607         switch (i) {
 608         case QWBTU_IRQ:
 609                 dev_info(&info->pdev->dev,
 610                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 611                 break;
 612         case WBTU_IRQ:
 613                 dev_info(&info->pdev->dev,
 614                         "Battery under temperature in work mode IRQ (WBTU)\n");
 615                 break;
 616         case QWBTO_IRQ:
 617                 dev_info(&info->pdev->dev,
 618                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 619                 break;
 620         case WBTO_IRQ:
 621                 dev_info(&info->pdev->dev,
 622                         "Battery over temperature in work mode IRQ (WBTO)\n");
 623                 break;
 624         case WL2_IRQ:
 625                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 626                 break;
 627         case WL1_IRQ:
 628                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 629                 break;
 630         default:
 631                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 632         }
 633
 634         power_supply_changed(info->bat);
 635         return IRQ_HANDLED;
 636 }
 637
 638 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 639 {
 640         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 641
 642         power_supply_changed(info->bat);
 643 }
 644
 645 static const struct power_supply_desc fuel_gauge_desc = {
 646         .name                   = DEV_NAME,
 647         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 648         .properties             = fuel_gauge_props,
 649         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 650         .get_property           = fuel_gauge_get_property,
 651         .set_property           = fuel_gauge_set_property,
 652         .property_is_writeable  = fuel_gauge_property_is_writeable,
 653         .external_power_changed = fuel_gauge_external_power_changed,
 654 };
 655
 656 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
 657 {
 658         int ret, i, pirq;
 659
 660         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 661                 pirq = platform_get_irq(info->pdev, i);
 662                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 663                 if (info->irq[i] < 0) {
 664                         dev_warn(&info->pdev->dev,
 665                                 "regmap_irq get virq failed for IRQ %d: %d\n",
 666                                 pirq, info->irq[i]);
 667                         info->irq[i] = -1;
 668                         goto intr_failed;
 669                 }
 670                 ret = request_threaded_irq(info->irq[i],
 671                                 NULL, fuel_gauge_thread_handler,
 672                                 IRQF_ONESHOT, DEV_NAME, info);
 673                 if (ret) {
 674                         dev_warn(&info->pdev->dev,
 675                                 "request irq failed for IRQ %d: %d\n",
 676                                 pirq, info->irq[i]);
 677                         info->irq[i] = -1;
 678                         goto intr_failed;
 679                 } else {
 680                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
 681                                 pirq, info->irq[i]);
 682                 }
 683         }
 684         return;
 685
 686 intr_failed:
 687         for (; i > 0; i--) {
 688                 free_irq(info->irq[i - 1], info);
 689                 info->irq[i - 1] = -1;
 690         }
 691 }
 692
 693 /*
 694  * Some devices have no battery (HDMI sticks) and the axp288 battery's
 695  * detection reports one despite it not being there.
 696  */
 697 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
 698         {
 699                 /* ACEPC T8 Cherry Trail Z8350 mini PC */
 700                 .matches = {
 701                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 702                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 703                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
 704                         /* also match on somewhat unique bios-version */
 705                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 706                 },
 707         },
 708         {
 709                 /* ACEPC T11 Cherry Trail Z8350 mini PC */
 710                 .matches = {
 711                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 712                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 713                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
 714                         /* also match on somewhat unique bios-version */
 715                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 716                 },
 717         },
 718         {
 719                 /* Intel Cherry Trail Compute Stick, Windows version */
 720                 .matches = {
 721                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 722                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
 723                 },
 724         },
 725         {
 726                 /* Intel Cherry Trail Compute Stick, version without an OS */
 727                 .matches = {
 728                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 729                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
 730                 },
 731         },
 732         {
 733                 /* Meegopad T08 */
 734                 .matches = {
 735                         DMI_MATCH(DMI_SYS_VENDOR, "Default string"),
 736                         DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."),
 737                         DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 738                         DMI_MATCH(DMI_BOARD_VERSION, "V1.1"),
 739                 },
 740         },
 741         {
 742                 /* ECS EF20EA */
 743                 .matches = {
 744                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 745                 },
 746         },
 747         {}
 748 };
 749
 750 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 751 {
 752         int i, ret = 0;
 753         struct axp288_fg_info *info;
 754         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 755         struct power_supply_config psy_cfg = {};
 756         static const char * const iio_chan_name[] = {
 757                 [BAT_TEMP] = "axp288-batt-temp",
 758                 [PMIC_TEMP] = "axp288-pmic-temp",
 759                 [SYSTEM_TEMP] = "axp288-system-temp",
 760                 [BAT_CHRG_CURR] = "axp288-chrg-curr",
 761                 [BAT_D_CURR] = "axp288-chrg-d-curr",
 762                 [BAT_VOLT] = "axp288-batt-volt",
 763         };
 764         unsigned int val;
 765
 766         if (dmi_check_system(axp288_fuel_gauge_blacklist))
 767                 return -ENODEV;
 768
 769         /*
 770          * On some devices the fuelgauge and charger parts of the axp288 are
 771          * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
 772          */
 773         ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
 774         if (ret < 0)
 775                 return ret;
 776         if (val == 0)
 777                 return -ENODEV;
 778
 779         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 780         if (!info)
 781                 return -ENOMEM;
 782
 783         info->pdev = pdev;
 784         info->regmap = axp20x->regmap;
 785         info->regmap_irqc = axp20x->regmap_irqc;
 786         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 787
 788         platform_set_drvdata(pdev, info);
 789
 790         mutex_init(&info->lock);
 791
 792         for (i = 0; i < IIO_CHANNEL_NUM; i++) {
 793                 /*
 794                  * Note cannot use devm_iio_channel_get because x86 systems
 795                  * lack the device<->channel maps which iio_channel_get will
 796                  * try to use when passed a non NULL device pointer.
 797                  */
 798                 info->iio_channel[i] =
 799                         iio_channel_get(NULL, iio_chan_name[i]);
 800                 if (IS_ERR(info->iio_channel[i])) {
 801                         ret = PTR_ERR(info->iio_channel[i]);
 802                         dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
 803                                 iio_chan_name[i], ret);
 804                         /* Wait for axp288_adc to load */
 805                         if (ret == -ENODEV)
 806                                 ret = -EPROBE_DEFER;
 807
 808                         goto out_free_iio_chan;
 809                 }
 810         }
 811
 812         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 813         if (ret < 0)
 814                 goto out_free_iio_chan;
 815
 816         if (!(ret & FG_DES_CAP1_VALID)) {
 817                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 818                 ret = -ENODEV;
 819                 goto out_free_iio_chan;
 820         }
 821
 822         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 823         if (ret < 0)
 824                 goto out_free_iio_chan;
 825         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 826         case CHRG_CCCV_CV_4100MV:
 827                 info->max_volt = 4100;
 828                 break;
 829         case CHRG_CCCV_CV_4150MV:
 830                 info->max_volt = 4150;
 831                 break;
 832         case CHRG_CCCV_CV_4200MV:
 833                 info->max_volt = 4200;
 834                 break;
 835         case CHRG_CCCV_CV_4350MV:
 836                 info->max_volt = 4350;
 837                 break;
 838         }
 839
 840         psy_cfg.drv_data = info;
 841         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 842         if (IS_ERR(info->bat)) {
 843                 ret = PTR_ERR(info->bat);
 844                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 845                 goto out_free_iio_chan;
 846         }
 847
 848         fuel_gauge_create_debugfs(info);
 849         fuel_gauge_init_irq(info);
 850
 851         return 0;
 852
 853 out_free_iio_chan:
 854         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 855                 if (!IS_ERR_OR_NULL(info->iio_channel[i]))
 856                         iio_channel_release(info->iio_channel[i]);
 857
 858         return ret;
 859 }
 860
 861 static const struct platform_device_id axp288_fg_id_table[] = {
 862         { .name = DEV_NAME },
 863         {},
 864 };
 865 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 866
 867 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 868 {
 869         struct axp288_fg_info *info = platform_get_drvdata(pdev);
 870         int i;
 871
 872         power_supply_unregister(info->bat);
 873         fuel_gauge_remove_debugfs(info);
 874
 875         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 876                 if (info->irq[i] >= 0)
 877                         free_irq(info->irq[i], info);
 878
 879         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 880                 iio_channel_release(info->iio_channel[i]);
 881
 882         return 0;
 883 }
 884
 885 static struct platform_driver axp288_fuel_gauge_driver = {
 886         .probe = axp288_fuel_gauge_probe,
 887         .remove = axp288_fuel_gauge_remove,
 888         .id_table = axp288_fg_id_table,
 889         .driver = {
 890                 .name = DEV_NAME,
 891         },
 892 };
 893
 894 module_platform_driver(axp288_fuel_gauge_driver);
 895
 896 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 897 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 898 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 899 MODULE_LICENSE("GPL");