drivers/power/supply/axp288_fuel_gauge.c

   1 /*
   2  * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/mfd/axp20x.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/power_supply.h>
  29 #include <linux/iio/consumer.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/seq_file.h>
  32 #include <asm/unaligned.h>
  33
  34 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  35 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  36 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  37 #define CHRG_STAT_CHARGING                      (1 << 6)
  38 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  39
  40 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  41 #define CHRG_CCCV_CC_BIT_POS            0
  42 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  43 #define CHRG_CCCV_CC_LSB_RES            200     /* 200mA */
  44 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  45 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  46 #define CHRG_CCCV_CV_BIT_POS            5
  47 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  48 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  49 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  50 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  51 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  52
  53 #define CV_4100                                         4100    /* 4100mV */
  54 #define CV_4150                                         4150    /* 4150mV */
  55 #define CV_4200                                         4200    /* 4200mV */
  56 #define CV_4350                                         4350    /* 4350mV */
  57
  58 #define TEMP_IRQ_CFG_QWBTU                      (1 << 0)
  59 #define TEMP_IRQ_CFG_WBTU                       (1 << 1)
  60 #define TEMP_IRQ_CFG_QWBTO                      (1 << 2)
  61 #define TEMP_IRQ_CFG_WBTO                       (1 << 3)
  62 #define TEMP_IRQ_CFG_MASK                       0xf
  63
  64 #define FG_IRQ_CFG_LOWBATT_WL2          (1 << 0)
  65 #define FG_IRQ_CFG_LOWBATT_WL1          (1 << 1)
  66 #define FG_IRQ_CFG_LOWBATT_MASK         0x3
  67 #define LOWBAT_IRQ_STAT_LOWBATT_WL2     (1 << 0)
  68 #define LOWBAT_IRQ_STAT_LOWBATT_WL1     (1 << 1)
  69
  70 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  71 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  72 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  73 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  74 #define FG_CNTL_CC_EN                           (1 << 6)
  75 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  76
  77 #define FG_15BIT_WORD_VALID                     (1 << 15)
  78 #define FG_15BIT_VAL_MASK                       0x7fff
  79
  80 #define FG_REP_CAP_VALID                        (1 << 7)
  81 #define FG_REP_CAP_VAL_MASK                     0x7F
  82
  83 #define FG_DES_CAP1_VALID                       (1 << 7)
  84 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  85
  86 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  87
  88 #define FG_OCV_CAP_VALID                        (1 << 7)
  89 #define FG_OCV_CAP_VAL_MASK                     0x7F
  90 #define FG_CC_CAP_VALID                         (1 << 7)
  91 #define FG_CC_CAP_VAL_MASK                      0x7F
  92
  93 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  94 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  95 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  96 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  97 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  98 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  99
 100 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
 101 #define NR_RETRY_CNT    3
 102 #define DEV_NAME        "axp288_fuel_gauge"
 103
 104 /* 1.1mV per LSB expressed in uV */
 105 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
 106 /* properties converted to tenths of degrees, uV, uA, uW */
 107 #define PROP_TEMP(a)            ((a) * 10)
 108 #define UNPROP_TEMP(a)          ((a) / 10)
 109 #define PROP_VOLT(a)            ((a) * 1000)
 110 #define PROP_CURR(a)            ((a) * 1000)
 111
 112 #define AXP288_FG_INTR_NUM      6
 113 enum {
 114         QWBTU_IRQ = 0,
 115         WBTU_IRQ,
 116         QWBTO_IRQ,
 117         WBTO_IRQ,
 118         WL2_IRQ,
 119         WL1_IRQ,
 120 };
 121
 122 struct axp288_fg_info {
 123         struct platform_device *pdev;
 124         struct axp20x_fg_pdata *pdata;
 125         struct regmap *regmap;
 126         struct regmap_irq_chip_data *regmap_irqc;
 127         int irq[AXP288_FG_INTR_NUM];
 128         struct power_supply *bat;
 129         struct mutex lock;
 130         int status;
 131         struct delayed_work status_monitor;
 132         struct dentry *debug_file;
 133 };
 134
 135 static enum power_supply_property fuel_gauge_props[] = {
 136         POWER_SUPPLY_PROP_STATUS,
 137         POWER_SUPPLY_PROP_PRESENT,
 138         POWER_SUPPLY_PROP_HEALTH,
 139         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 140         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 141         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 142         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 143         POWER_SUPPLY_PROP_CURRENT_NOW,
 144         POWER_SUPPLY_PROP_CAPACITY,
 145         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 146         POWER_SUPPLY_PROP_TEMP,
 147         POWER_SUPPLY_PROP_TEMP_MAX,
 148         POWER_SUPPLY_PROP_TEMP_MIN,
 149         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 150         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 151         POWER_SUPPLY_PROP_TECHNOLOGY,
 152         POWER_SUPPLY_PROP_CHARGE_FULL,
 153         POWER_SUPPLY_PROP_CHARGE_NOW,
 154         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 155         POWER_SUPPLY_PROP_MODEL_NAME,
 156 };
 157
 158 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 159 {
 160         int ret, i;
 161         unsigned int val;
 162
 163         for (i = 0; i < NR_RETRY_CNT; i++) {
 164                 ret = regmap_read(info->regmap, reg, &val);
 165                 if (ret == -EBUSY)
 166                         continue;
 167                 else
 168                         break;
 169         }
 170
 171         if (ret < 0) {
 172                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
 173                 return ret;
 174         }
 175
 176         return val;
 177 }
 178
 179 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 180 {
 181         int ret;
 182
 183         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 184
 185         if (ret < 0)
 186                 dev_err(&info->pdev->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
 187
 188         return ret;
 189 }
 190
 191 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 192 {
 193         unsigned char buf[2];
 194         int ret;
 195
 196         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 197         if (ret < 0) {
 198                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 199                         reg, ret);
 200                 return ret;
 201         }
 202
 203         ret = get_unaligned_be16(buf);
 204         if (!(ret & FG_15BIT_WORD_VALID)) {
 205                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
 206                         reg);
 207                 return -ENXIO;
 208         }
 209
 210         return ret & FG_15BIT_VAL_MASK;
 211 }
 212
 213 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 214 {
 215         unsigned char buf[2];
 216         int ret;
 217
 218         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 219         if (ret < 0) {
 220                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 221                         reg, ret);
 222                 return ret;
 223         }
 224
 225         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 226         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 227 }
 228
 229 static int pmic_read_adc_val(const char *name, int *raw_val,
 230                 struct axp288_fg_info *info)
 231 {
 232         int ret, val = 0;
 233         struct iio_channel *indio_chan;
 234
 235         indio_chan = iio_channel_get(NULL, name);
 236         if (IS_ERR_OR_NULL(indio_chan)) {
 237                 ret = PTR_ERR(indio_chan);
 238                 goto exit;
 239         }
 240         ret = iio_read_channel_raw(indio_chan, &val);
 241         if (ret < 0) {
 242                 dev_err(&info->pdev->dev,
 243                         "IIO channel read error: %x, %x\n", ret, val);
 244                 goto err_exit;
 245         }
 246
 247         dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
 248         *raw_val = val;
 249
 250 err_exit:
 251         iio_channel_release(indio_chan);
 252 exit:
 253         return ret;
 254 }
 255
 256 #ifdef CONFIG_DEBUG_FS
 257 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 258 {
 259         struct axp288_fg_info *info = s->private;
 260         int raw_val, ret;
 261
 262         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 263                 AXP20X_PWR_INPUT_STATUS,
 264                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 265         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 266                 AXP20X_PWR_OP_MODE,
 267                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 268         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 269                 AXP20X_CHRG_CTRL1,
 270                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 271         seq_printf(s, "       VLTF[%02x] : %02x\n",
 272                 AXP20X_V_LTF_DISCHRG,
 273                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 274         seq_printf(s, "       VHTF[%02x] : %02x\n",
 275                 AXP20X_V_HTF_DISCHRG,
 276                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 277         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 278                 AXP20X_CC_CTRL,
 279                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 280         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 281                 AXP20X_FG_RES,
 282                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 283         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 284                 AXP288_FG_RDC1_REG,
 285                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 286         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 287                 AXP288_FG_RDC0_REG,
 288                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 289         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
 290                 AXP288_FG_OCVH_REG,
 291                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
 292         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
 293                 AXP288_FG_DES_CAP1_REG,
 294                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
 295         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
 296                 AXP288_FG_CC_MTR1_REG,
 297                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
 298         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 299                 AXP288_FG_OCV_CAP_REG,
 300                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 301         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 302                 AXP288_FG_CC_CAP_REG,
 303                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 304         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 305                 AXP288_FG_LOW_CAP_REG,
 306                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 307         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 308                 AXP288_FG_TUNE0,
 309                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 310         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 311                 AXP288_FG_TUNE1,
 312                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 313         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 314                 AXP288_FG_TUNE2,
 315                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 316         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 317                 AXP288_FG_TUNE3,
 318                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 319         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 320                 AXP288_FG_TUNE4,
 321                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 322         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 323                 AXP288_FG_TUNE5,
 324                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 325
 326         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 327         if (ret >= 0)
 328                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 329         ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
 330         if (ret >= 0)
 331                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 332         ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
 333         if (ret >= 0)
 334                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 335         ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
 336         if (ret >= 0)
 337                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 338         ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
 339         if (ret >= 0)
 340                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 341         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 342         if (ret >= 0)
 343                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 344
 345         return 0;
 346 }
 347
 348 static int debug_open(struct inode *inode, struct file *file)
 349 {
 350         return single_open(file, fuel_gauge_debug_show, inode->i_private);
 351 }
 352
 353 static const struct file_operations fg_debug_fops = {
 354         .open       = debug_open,
 355         .read       = seq_read,
 356         .llseek     = seq_lseek,
 357         .release    = single_release,
 358 };
 359
 360 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 361 {
 362         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 363                 info, &fg_debug_fops);
 364 }
 365
 366 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 367 {
 368         debugfs_remove(info->debug_file);
 369 }
 370 #else
 371 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 372 {
 373 }
 374 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 375 {
 376 }
 377 #endif
 378
 379 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 380 {
 381         int pwr_stat, ret;
 382         int charge, discharge;
 383
 384         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 385         if (pwr_stat < 0) {
 386                 dev_err(&info->pdev->dev,
 387                         "PWR STAT read failed:%d\n", pwr_stat);
 388                 return;
 389         }
 390         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 391         if (ret < 0) {
 392                 dev_err(&info->pdev->dev,
 393                         "ADC charge current read failed:%d\n", ret);
 394                 return;
 395         }
 396         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 397         if (ret < 0) {
 398                 dev_err(&info->pdev->dev,
 399                         "ADC discharge current read failed:%d\n", ret);
 400                 return;
 401         }
 402
 403         if (charge > 0)
 404                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 405         else if (discharge > 0)
 406                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 407         else {
 408                 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
 409                         info->status = POWER_SUPPLY_STATUS_FULL;
 410                 else
 411                         info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 412         }
 413 }
 414
 415 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 416 {
 417         int ret = 0, raw_val;
 418
 419         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 420         if (ret < 0)
 421                 goto vbatt_read_fail;
 422
 423         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 424 vbatt_read_fail:
 425         return ret;
 426 }
 427
 428 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 429 {
 430         int ret, value = 0;
 431         int charge, discharge;
 432
 433         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 434         if (ret < 0)
 435                 goto current_read_fail;
 436         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 437         if (ret < 0)
 438                 goto current_read_fail;
 439
 440         if (charge > 0)
 441                 value = charge;
 442         else if (discharge > 0)
 443                 value = -1 * discharge;
 444
 445         *cur = value;
 446 current_read_fail:
 447         return ret;
 448 }
 449
 450 static int temp_to_adc(struct axp288_fg_info *info, int tval)
 451 {
 452         int rntc = 0, i, ret, adc_val;
 453         int rmin, rmax, tmin, tmax;
 454         int tcsz = info->pdata->tcsz;
 455
 456         /* get the Rntc resitance value for this temp */
 457         if (tval > info->pdata->thermistor_curve[0][1]) {
 458                 rntc = info->pdata->thermistor_curve[0][0];
 459         } else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
 460                 rntc = info->pdata->thermistor_curve[tcsz-1][0];
 461         } else {
 462                 for (i = 1; i < tcsz; i++) {
 463                         if (tval > info->pdata->thermistor_curve[i][1]) {
 464                                 rmin = info->pdata->thermistor_curve[i-1][0];
 465                                 rmax = info->pdata->thermistor_curve[i][0];
 466                                 tmin = info->pdata->thermistor_curve[i-1][1];
 467                                 tmax = info->pdata->thermistor_curve[i][1];
 468                                 rntc = rmin + ((rmax - rmin) *
 469                                         (tval - tmin) / (tmax - tmin));
 470                                 break;
 471                         }
 472                 }
 473         }
 474
 475         /* we need the current to calculate the proper adc voltage */
 476         ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
 477         if (ret < 0) {
 478                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 479                 ret = 0x30;
 480         }
 481
 482         /*
 483          * temperature is proportional to NTS thermistor resistance
 484          * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
 485          * [12-bit ADC VAL] = R_NTC(Ω) * current / 800
 486          */
 487         adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
 488
 489         return adc_val;
 490 }
 491
 492 static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
 493 {
 494         int ret, r, i, tval = 0;
 495         int rmin, rmax, tmin, tmax;
 496         int tcsz = info->pdata->tcsz;
 497
 498         ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
 499         if (ret < 0) {
 500                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 501                 ret = 0x30;
 502         }
 503
 504         /*
 505          * temperature is proportional to NTS thermistor resistance
 506          * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
 507          * R_NTC(Ω) = [12-bit ADC VAL] * 800 / current
 508          */
 509         r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
 510
 511         if (r < info->pdata->thermistor_curve[0][0]) {
 512                 tval = info->pdata->thermistor_curve[0][1];
 513         } else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
 514                 tval = info->pdata->thermistor_curve[tcsz-1][1];
 515         } else {
 516                 for (i = 1; i < tcsz; i++) {
 517                         if (r < info->pdata->thermistor_curve[i][0]) {
 518                                 rmin = info->pdata->thermistor_curve[i-1][0];
 519                                 rmax = info->pdata->thermistor_curve[i][0];
 520                                 tmin = info->pdata->thermistor_curve[i-1][1];
 521                                 tmax = info->pdata->thermistor_curve[i][1];
 522                                 tval = tmin + ((tmax - tmin) *
 523                                         (r - rmin) / (rmax - rmin));
 524                                 break;
 525                         }
 526                 }
 527         }
 528
 529         return tval;
 530 }
 531
 532 static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
 533 {
 534         int ret, raw_val = 0;
 535
 536         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 537         if (ret < 0)
 538                 goto temp_read_fail;
 539
 540         *btemp = adc_to_temp(info, raw_val);
 541
 542 temp_read_fail:
 543         return ret;
 544 }
 545
 546 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 547 {
 548         int ret;
 549
 550         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 551         if (ret >= 0)
 552                 *vocv = VOLTAGE_FROM_ADC(ret);
 553
 554         return ret;
 555 }
 556
 557 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 558 {
 559         int temp, vocv;
 560         int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 561
 562         ret = fuel_gauge_get_btemp(info, &temp);
 563         if (ret < 0)
 564                 goto health_read_fail;
 565
 566         ret = fuel_gauge_get_vocv(info, &vocv);
 567         if (ret < 0)
 568                 goto health_read_fail;
 569
 570         if (vocv > info->pdata->max_volt)
 571                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 572         else if (temp > info->pdata->max_temp)
 573                 health = POWER_SUPPLY_HEALTH_OVERHEAT;
 574         else if (temp < info->pdata->min_temp)
 575                 health = POWER_SUPPLY_HEALTH_COLD;
 576         else if (vocv < info->pdata->min_volt)
 577                 health = POWER_SUPPLY_HEALTH_DEAD;
 578         else
 579                 health = POWER_SUPPLY_HEALTH_GOOD;
 580
 581 health_read_fail:
 582         return health;
 583 }
 584
 585 static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
 586 {
 587         int ret, adc_val;
 588
 589         /* program temperature threshold as 1/16 ADC value */
 590         adc_val = temp_to_adc(info, info->pdata->max_temp);
 591         ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
 592
 593         return ret;
 594 }
 595
 596 static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
 597 {
 598         int ret, adc_val;
 599
 600         /* program temperature threshold as 1/16 ADC value */
 601         adc_val = temp_to_adc(info, info->pdata->min_temp);
 602         ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
 603
 604         return ret;
 605 }
 606
 607 static int fuel_gauge_get_property(struct power_supply *ps,
 608                 enum power_supply_property prop,
 609                 union power_supply_propval *val)
 610 {
 611         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 612         int ret = 0, value;
 613
 614         mutex_lock(&info->lock);
 615         switch (prop) {
 616         case POWER_SUPPLY_PROP_STATUS:
 617                 fuel_gauge_get_status(info);
 618                 val->intval = info->status;
 619                 break;
 620         case POWER_SUPPLY_PROP_HEALTH:
 621                 val->intval = fuel_gauge_battery_health(info);
 622                 break;
 623         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 624                 ret = fuel_gauge_get_vbatt(info, &value);
 625                 if (ret < 0)
 626                         goto fuel_gauge_read_err;
 627                 val->intval = PROP_VOLT(value);
 628                 break;
 629         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 630                 ret = fuel_gauge_get_vocv(info, &value);
 631                 if (ret < 0)
 632                         goto fuel_gauge_read_err;
 633                 val->intval = PROP_VOLT(value);
 634                 break;
 635         case POWER_SUPPLY_PROP_CURRENT_NOW:
 636                 ret = fuel_gauge_get_current(info, &value);
 637                 if (ret < 0)
 638                         goto fuel_gauge_read_err;
 639                 val->intval = PROP_CURR(value);
 640                 break;
 641         case POWER_SUPPLY_PROP_PRESENT:
 642                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 643                 if (ret < 0)
 644                         goto fuel_gauge_read_err;
 645
 646                 if (ret & CHRG_STAT_BAT_PRESENT)
 647                         val->intval = 1;
 648                 else
 649                         val->intval = 0;
 650                 break;
 651         case POWER_SUPPLY_PROP_CAPACITY:
 652                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 653                 if (ret < 0)
 654                         goto fuel_gauge_read_err;
 655
 656                 if (!(ret & FG_REP_CAP_VALID))
 657                         dev_err(&info->pdev->dev,
 658                                 "capacity measurement not valid\n");
 659                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 660                 break;
 661         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 662                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 663                 if (ret < 0)
 664                         goto fuel_gauge_read_err;
 665                 val->intval = (ret & 0x0f);
 666                 break;
 667         case POWER_SUPPLY_PROP_TEMP:
 668                 ret = fuel_gauge_get_btemp(info, &value);
 669                 if (ret < 0)
 670                         goto fuel_gauge_read_err;
 671                 val->intval = PROP_TEMP(value);
 672                 break;
 673         case POWER_SUPPLY_PROP_TEMP_MAX:
 674         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 675                 val->intval = PROP_TEMP(info->pdata->max_temp);
 676                 break;
 677         case POWER_SUPPLY_PROP_TEMP_MIN:
 678         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 679                 val->intval = PROP_TEMP(info->pdata->min_temp);
 680                 break;
 681         case POWER_SUPPLY_PROP_TECHNOLOGY:
 682                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 683                 break;
 684         case POWER_SUPPLY_PROP_CHARGE_NOW:
 685                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 686                 if (ret < 0)
 687                         goto fuel_gauge_read_err;
 688
 689                 val->intval = ret * FG_DES_CAP_RES_LSB;
 690                 break;
 691         case POWER_SUPPLY_PROP_CHARGE_FULL:
 692                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 693                 if (ret < 0)
 694                         goto fuel_gauge_read_err;
 695
 696                 val->intval = ret * FG_DES_CAP_RES_LSB;
 697                 break;
 698         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 699                 val->intval = PROP_CURR(info->pdata->design_cap);
 700                 break;
 701         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 702                 val->intval = PROP_VOLT(info->pdata->max_volt);
 703                 break;
 704         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 705                 val->intval = PROP_VOLT(info->pdata->min_volt);
 706                 break;
 707         case POWER_SUPPLY_PROP_MODEL_NAME:
 708                 val->strval = info->pdata->battid;
 709                 break;
 710         default:
 711                 mutex_unlock(&info->lock);
 712                 return -EINVAL;
 713         }
 714
 715         mutex_unlock(&info->lock);
 716         return 0;
 717
 718 fuel_gauge_read_err:
 719         mutex_unlock(&info->lock);
 720         return ret;
 721 }
 722
 723 static int fuel_gauge_set_property(struct power_supply *ps,
 724                 enum power_supply_property prop,
 725                 const union power_supply_propval *val)
 726 {
 727         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 728         int ret = 0;
 729
 730         mutex_lock(&info->lock);
 731         switch (prop) {
 732         case POWER_SUPPLY_PROP_STATUS:
 733                 info->status = val->intval;
 734                 break;
 735         case POWER_SUPPLY_PROP_TEMP_MIN:
 736         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 737                 if ((val->intval < PD_DEF_MIN_TEMP) ||
 738                         (val->intval > PD_DEF_MAX_TEMP)) {
 739                         ret = -EINVAL;
 740                         break;
 741                 }
 742                 info->pdata->min_temp = UNPROP_TEMP(val->intval);
 743                 ret = fuel_gauge_set_low_btemp_alert(info);
 744                 if (ret < 0)
 745                         dev_err(&info->pdev->dev,
 746                                 "temp alert min set fail:%d\n", ret);
 747                 break;
 748         case POWER_SUPPLY_PROP_TEMP_MAX:
 749         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 750                 if ((val->intval < PD_DEF_MIN_TEMP) ||
 751                         (val->intval > PD_DEF_MAX_TEMP)) {
 752                         ret = -EINVAL;
 753                         break;
 754                 }
 755                 info->pdata->max_temp = UNPROP_TEMP(val->intval);
 756                 ret = fuel_gauge_set_high_btemp_alert(info);
 757                 if (ret < 0)
 758                         dev_err(&info->pdev->dev,
 759                                 "temp alert max set fail:%d\n", ret);
 760                 break;
 761         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 762                 if ((val->intval < 0) || (val->intval > 15)) {
 763                         ret = -EINVAL;
 764                         break;
 765                 }
 766                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 767                 if (ret < 0)
 768                         break;
 769                 ret &= 0xf0;
 770                 ret |= (val->intval & 0xf);
 771                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 772                 break;
 773         default:
 774                 ret = -EINVAL;
 775                 break;
 776         }
 777
 778         mutex_unlock(&info->lock);
 779         return ret;
 780 }
 781
 782 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 783         enum power_supply_property psp)
 784 {
 785         int ret;
 786
 787         switch (psp) {
 788         case POWER_SUPPLY_PROP_STATUS:
 789         case POWER_SUPPLY_PROP_TEMP_MIN:
 790         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 791         case POWER_SUPPLY_PROP_TEMP_MAX:
 792         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 793         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 794                 ret = 1;
 795                 break;
 796         default:
 797                 ret = 0;
 798         }
 799
 800         return ret;
 801 }
 802
 803 static void fuel_gauge_status_monitor(struct work_struct *work)
 804 {
 805         struct axp288_fg_info *info = container_of(work,
 806                 struct axp288_fg_info, status_monitor.work);
 807
 808         fuel_gauge_get_status(info);
 809         power_supply_changed(info->bat);
 810         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 811 }
 812
 813 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 814 {
 815         struct axp288_fg_info *info = dev;
 816         int i;
 817
 818         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 819                 if (info->irq[i] == irq)
 820                         break;
 821         }
 822
 823         if (i >= AXP288_FG_INTR_NUM) {
 824                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 825                 return IRQ_NONE;
 826         }
 827
 828         switch (i) {
 829         case QWBTU_IRQ:
 830                 dev_info(&info->pdev->dev,
 831                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 832                 break;
 833         case WBTU_IRQ:
 834                 dev_info(&info->pdev->dev,
 835                         "Battery under temperature in work mode IRQ (WBTU)\n");
 836                 break;
 837         case QWBTO_IRQ:
 838                 dev_info(&info->pdev->dev,
 839                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 840                 break;
 841         case WBTO_IRQ:
 842                 dev_info(&info->pdev->dev,
 843                         "Battery over temperature in work mode IRQ (WBTO)\n");
 844                 break;
 845         case WL2_IRQ:
 846                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 847                 break;
 848         case WL1_IRQ:
 849                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 850                 break;
 851         default:
 852                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 853         }
 854
 855         power_supply_changed(info->bat);
 856         return IRQ_HANDLED;
 857 }
 858
 859 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 860 {
 861         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 862
 863         power_supply_changed(info->bat);
 864 }
 865
 866 static const struct power_supply_desc fuel_gauge_desc = {
 867         .name                   = DEV_NAME,
 868         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 869         .properties             = fuel_gauge_props,
 870         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 871         .get_property           = fuel_gauge_get_property,
 872         .set_property           = fuel_gauge_set_property,
 873         .property_is_writeable  = fuel_gauge_property_is_writeable,
 874         .external_power_changed = fuel_gauge_external_power_changed,
 875 };
 876
 877 static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
 878 {
 879         int ret;
 880         u8 reg_val;
 881
 882         ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 883         if (ret < 0) {
 884                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 885                 return ret;
 886         }
 887         ret = (ret & FG_REP_CAP_VAL_MASK);
 888
 889         if (ret > FG_LOW_CAP_WARN_THR)
 890                 reg_val = FG_LOW_CAP_WARN_THR;
 891         else if (ret > FG_LOW_CAP_CRIT_THR)
 892                 reg_val = FG_LOW_CAP_CRIT_THR;
 893         else
 894                 reg_val = FG_LOW_CAP_SHDN_THR;
 895
 896         reg_val |= FG_LOW_CAP_THR1_VAL;
 897         ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
 898         if (ret < 0)
 899                 dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
 900
 901         return ret;
 902 }
 903
 904 static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
 905 {
 906         int ret;
 907         u8 val;
 908
 909         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 910         if (ret < 0)
 911                 goto fg_prog_ocv_fail;
 912         else
 913                 val = (ret & ~CHRG_CCCV_CV_MASK);
 914
 915         switch (info->pdata->max_volt) {
 916         case CV_4100:
 917                 val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
 918                 break;
 919         case CV_4150:
 920                 val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
 921                 break;
 922         case CV_4200:
 923                 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
 924                 break;
 925         case CV_4350:
 926                 val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
 927                 break;
 928         default:
 929                 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
 930                 break;
 931         }
 932
 933         ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
 934 fg_prog_ocv_fail:
 935         return ret;
 936 }
 937
 938 static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
 939 {
 940         int ret;
 941
 942         ret = fuel_gauge_reg_writeb(info,
 943                 AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
 944         if (ret < 0)
 945                 goto fg_prog_descap_fail;
 946
 947         ret = fuel_gauge_reg_writeb(info,
 948                 AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
 949
 950 fg_prog_descap_fail:
 951         return ret;
 952 }
 953
 954 static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
 955 {
 956         int ret = 0, i;
 957
 958         for (i = 0; i < OCV_CURVE_SIZE; i++) {
 959                 ret = fuel_gauge_reg_writeb(info,
 960                         AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
 961                 if (ret < 0)
 962                         goto fg_prog_ocv_fail;
 963         }
 964
 965 fg_prog_ocv_fail:
 966         return ret;
 967 }
 968
 969 static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
 970 {
 971         int ret;
 972
 973         ret = fuel_gauge_reg_writeb(info,
 974                 AXP288_FG_RDC1_REG, info->pdata->rdc1);
 975         if (ret < 0)
 976                 goto fg_prog_ocv_fail;
 977
 978         ret = fuel_gauge_reg_writeb(info,
 979                 AXP288_FG_RDC0_REG, info->pdata->rdc0);
 980
 981 fg_prog_ocv_fail:
 982         return ret;
 983 }
 984
 985 static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
 986 {
 987         int ret;
 988
 989         /*
 990          * check if the config data is already
 991          * programmed and if so just return.
 992          */
 993
 994         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 995         if (ret < 0) {
 996                 dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
 997         } else if (!(ret & FG_DES_CAP1_VALID)) {
 998                 dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
 999         } else {
1000                 dev_info(&info->pdev->dev, "FG data is already initialized\n");
1001                 return;
1002         }
1003
1004         ret = fuel_gauge_program_vbatt_full(info);
1005         if (ret < 0)
1006                 dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
1007
1008         ret = fuel_gauge_program_design_cap(info);
1009         if (ret < 0)
1010                 dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
1011
1012         ret = fuel_gauge_program_rdc_vals(info);
1013         if (ret < 0)
1014                 dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
1015
1016         ret = fuel_gauge_program_ocv_curve(info);
1017         if (ret < 0)
1018                 dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
1019
1020         ret = fuel_gauge_set_lowbatt_thresholds(info);
1021         if (ret < 0)
1022                 dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
1023
1024         ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
1025         if (ret < 0)
1026                 dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
1027 }
1028
1029 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
1030 {
1031         int ret, i, pirq;
1032
1033         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
1034                 pirq = platform_get_irq(info->pdev, i);
1035                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
1036                 if (info->irq[i] < 0) {
1037                         dev_warn(&info->pdev->dev,
1038                                 "regmap_irq get virq failed for IRQ %d: %d\n",
1039                                 pirq, info->irq[i]);
1040                         info->irq[i] = -1;
1041                         goto intr_failed;
1042                 }
1043                 ret = request_threaded_irq(info->irq[i],
1044                                 NULL, fuel_gauge_thread_handler,
1045                                 IRQF_ONESHOT, DEV_NAME, info);
1046                 if (ret) {
1047                         dev_warn(&info->pdev->dev,
1048                                 "request irq failed for IRQ %d: %d\n",
1049                                 pirq, info->irq[i]);
1050                         info->irq[i] = -1;
1051                         goto intr_failed;
1052                 } else {
1053                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
1054                                 pirq, info->irq[i]);
1055                 }
1056         }
1057         return;
1058
1059 intr_failed:
1060         for (; i > 0; i--) {
1061                 free_irq(info->irq[i - 1], info);
1062                 info->irq[i - 1] = -1;
1063         }
1064 }
1065
1066 static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
1067 {
1068         int ret;
1069         unsigned int val;
1070
1071         ret = fuel_gauge_set_high_btemp_alert(info);
1072         if (ret < 0)
1073                 dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
1074
1075         ret = fuel_gauge_set_low_btemp_alert(info);
1076         if (ret < 0)
1077                 dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
1078
1079         /* enable interrupts */
1080         val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
1081         val |= TEMP_IRQ_CFG_MASK;
1082         fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
1083
1084         val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
1085         val |= FG_IRQ_CFG_LOWBATT_MASK;
1086         val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
1087 }
1088
1089 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
1090 {
1091         int ret = 0;
1092         struct axp288_fg_info *info;
1093         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
1094         struct power_supply_config psy_cfg = {};
1095
1096         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1097         if (!info)
1098                 return -ENOMEM;
1099
1100         info->pdev = pdev;
1101         info->regmap = axp20x->regmap;
1102         info->regmap_irqc = axp20x->regmap_irqc;
1103         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
1104         info->pdata = pdev->dev.platform_data;
1105         if (!info->pdata)
1106                 return -ENODEV;
1107
1108         platform_set_drvdata(pdev, info);
1109
1110         mutex_init(&info->lock);
1111         INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
1112
1113         psy_cfg.drv_data = info;
1114         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
1115         if (IS_ERR(info->bat)) {
1116                 ret = PTR_ERR(info->bat);
1117                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
1118                 return ret;
1119         }
1120
1121         fuel_gauge_create_debugfs(info);
1122         fuel_gauge_init_config_regs(info);
1123         fuel_gauge_init_irq(info);
1124         fuel_gauge_init_hw_regs(info);
1125         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
1126
1127         return ret;
1128 }
1129
1130 static const struct platform_device_id axp288_fg_id_table[] = {
1131         { .name = DEV_NAME },
1132         {},
1133 };
1134
1135 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
1136 {
1137         struct axp288_fg_info *info = platform_get_drvdata(pdev);
1138         int i;
1139
1140         cancel_delayed_work_sync(&info->status_monitor);
1141         power_supply_unregister(info->bat);
1142         fuel_gauge_remove_debugfs(info);
1143
1144         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
1145                 if (info->irq[i] >= 0)
1146                         free_irq(info->irq[i], info);
1147
1148         return 0;
1149 }
1150
1151 static struct platform_driver axp288_fuel_gauge_driver = {
1152         .probe = axp288_fuel_gauge_probe,
1153         .remove = axp288_fuel_gauge_remove,
1154         .id_table = axp288_fg_id_table,
1155         .driver = {
1156                 .name = DEV_NAME,
1157         },
1158 };
1159
1160 module_platform_driver(axp288_fuel_gauge_driver);
1161
1162 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
1163 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1164 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1165 MODULE_LICENSE("GPL");