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
  33 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  34 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  35 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  36 #define CHRG_STAT_CHARGING                      (1 << 6)
  37 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  38
  39 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  40 #define CHRG_CCCV_CC_BIT_POS            0
  41 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  42 #define CHRG_CCCV_CC_LSB_RES            200     /* 200mA */
  43 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  44 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  45 #define CHRG_CCCV_CV_BIT_POS            5
  46 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  47 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  48 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  49 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  50 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  51
  52 #define CV_4100                                         4100    /* 4100mV */
  53 #define CV_4150                                         4150    /* 4150mV */
  54 #define CV_4200                                         4200    /* 4200mV */
  55 #define CV_4350                                         4350    /* 4350mV */
  56
  57 #define TEMP_IRQ_CFG_QWBTU                      (1 << 0)
  58 #define TEMP_IRQ_CFG_WBTU                       (1 << 1)
  59 #define TEMP_IRQ_CFG_QWBTO                      (1 << 2)
  60 #define TEMP_IRQ_CFG_WBTO                       (1 << 3)
  61 #define TEMP_IRQ_CFG_MASK                       0xf
  62
  63 #define FG_IRQ_CFG_LOWBATT_WL2          (1 << 0)
  64 #define FG_IRQ_CFG_LOWBATT_WL1          (1 << 1)
  65 #define FG_IRQ_CFG_LOWBATT_MASK         0x3
  66 #define LOWBAT_IRQ_STAT_LOWBATT_WL2     (1 << 0)
  67 #define LOWBAT_IRQ_STAT_LOWBATT_WL1     (1 << 1)
  68
  69 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  70 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  71 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  72 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  73 #define FG_CNTL_CC_EN                           (1 << 6)
  74 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  75
  76 #define FG_REP_CAP_VALID                        (1 << 7)
  77 #define FG_REP_CAP_VAL_MASK                     0x7F
  78
  79 #define FG_DES_CAP1_VALID                       (1 << 7)
  80 #define FG_DES_CAP1_VAL_MASK            0x7F
  81 #define FG_DES_CAP0_VAL_MASK            0xFF
  82 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  83
  84 #define FG_CC_MTR1_VALID                        (1 << 7)
  85 #define FG_CC_MTR1_VAL_MASK                     0x7F
  86 #define FG_CC_MTR0_VAL_MASK                     0xFF
  87 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  88
  89 #define FG_OCV_CAP_VALID                        (1 << 7)
  90 #define FG_OCV_CAP_VAL_MASK                     0x7F
  91 #define FG_CC_CAP_VALID                         (1 << 7)
  92 #define FG_CC_CAP_VAL_MASK                      0x7F
  93
  94 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  95 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  96 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  97 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  98 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  99 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
 100
 101 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
 102 #define NR_RETRY_CNT    3
 103 #define DEV_NAME        "axp288_fuel_gauge"
 104
 105 /* 1.1mV per LSB expressed in uV */
 106 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
 107 /* properties converted to tenths of degrees, uV, uA, uW */
 108 #define PROP_TEMP(a)            ((a) * 10)
 109 #define UNPROP_TEMP(a)          ((a) / 10)
 110 #define PROP_VOLT(a)            ((a) * 1000)
 111 #define PROP_CURR(a)            ((a) * 1000)
 112
 113 #define AXP288_FG_INTR_NUM      6
 114 enum {
 115         QWBTU_IRQ = 0,
 116         WBTU_IRQ,
 117         QWBTO_IRQ,
 118         WBTO_IRQ,
 119         WL2_IRQ,
 120         WL1_IRQ,
 121 };
 122
 123 struct axp288_fg_info {
 124         struct platform_device *pdev;
 125         struct axp20x_fg_pdata *pdata;
 126         struct regmap *regmap;
 127         struct regmap_irq_chip_data *regmap_irqc;
 128         int irq[AXP288_FG_INTR_NUM];
 129         struct power_supply *bat;
 130         struct mutex lock;
 131         int status;
 132         struct delayed_work status_monitor;
 133         struct dentry *debug_file;
 134 };
 135
 136 static enum power_supply_property fuel_gauge_props[] = {
 137         POWER_SUPPLY_PROP_STATUS,
 138         POWER_SUPPLY_PROP_PRESENT,
 139         POWER_SUPPLY_PROP_HEALTH,
 140         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 141         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 142         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 143         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 144         POWER_SUPPLY_PROP_CURRENT_NOW,
 145         POWER_SUPPLY_PROP_CAPACITY,
 146         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 147         POWER_SUPPLY_PROP_TEMP,
 148         POWER_SUPPLY_PROP_TEMP_MAX,
 149         POWER_SUPPLY_PROP_TEMP_MIN,
 150         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
 151         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
 152         POWER_SUPPLY_PROP_TECHNOLOGY,
 153         POWER_SUPPLY_PROP_CHARGE_FULL,
 154         POWER_SUPPLY_PROP_CHARGE_NOW,
 155         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 156         POWER_SUPPLY_PROP_MODEL_NAME,
 157 };
 158
 159 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 160 {
 161         int ret, i;
 162         unsigned int val;
 163
 164         for (i = 0; i < NR_RETRY_CNT; i++) {
 165                 ret = regmap_read(info->regmap, reg, &val);
 166                 if (ret == -EBUSY)
 167                         continue;
 168                 else
 169                         break;
 170         }
 171
 172         if (ret < 0) {
 173                 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
 174                 return ret;
 175         }
 176
 177         return val;
 178 }
 179
 180 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 181 {
 182         int ret;
 183
 184         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 185
 186         if (ret < 0)
 187                 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
 188
 189         return ret;
 190 }
 191
 192 static int pmic_read_adc_val(const char *name, int *raw_val,
 193                 struct axp288_fg_info *info)
 194 {
 195         int ret, val = 0;
 196         struct iio_channel *indio_chan;
 197
 198         indio_chan = iio_channel_get(NULL, name);
 199         if (IS_ERR_OR_NULL(indio_chan)) {
 200                 ret = PTR_ERR(indio_chan);
 201                 goto exit;
 202         }
 203         ret = iio_read_channel_raw(indio_chan, &val);
 204         if (ret < 0) {
 205                 dev_err(&info->pdev->dev,
 206                         "IIO channel read error: %x, %x\n", ret, val);
 207                 goto err_exit;
 208         }
 209
 210         dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
 211         *raw_val = val;
 212
 213 err_exit:
 214         iio_channel_release(indio_chan);
 215 exit:
 216         return ret;
 217 }
 218
 219 #ifdef CONFIG_DEBUG_FS
 220 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 221 {
 222         struct axp288_fg_info *info = s->private;
 223         int raw_val, ret;
 224
 225         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 226                 AXP20X_PWR_INPUT_STATUS,
 227                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 228         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 229                 AXP20X_PWR_OP_MODE,
 230                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 231         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 232                 AXP20X_CHRG_CTRL1,
 233                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 234         seq_printf(s, "       VLTF[%02x] : %02x\n",
 235                 AXP20X_V_LTF_DISCHRG,
 236                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 237         seq_printf(s, "       VHTF[%02x] : %02x\n",
 238                 AXP20X_V_HTF_DISCHRG,
 239                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 240         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 241                 AXP20X_CC_CTRL,
 242                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 243         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 244                 AXP20X_FG_RES,
 245                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 246         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 247                 AXP288_FG_RDC1_REG,
 248                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 249         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 250                 AXP288_FG_RDC0_REG,
 251                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 252         seq_printf(s, "    FG_OCVH[%02x] : %02x\n",
 253                 AXP288_FG_OCVH_REG,
 254                 fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
 255         seq_printf(s, "    FG_OCVL[%02x] : %02x\n",
 256                 AXP288_FG_OCVL_REG,
 257                 fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
 258         seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
 259                 AXP288_FG_DES_CAP1_REG,
 260                 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
 261         seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
 262                 AXP288_FG_DES_CAP0_REG,
 263                 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
 264         seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
 265                 AXP288_FG_CC_MTR1_REG,
 266                 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
 267         seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
 268                 AXP288_FG_CC_MTR0_REG,
 269                 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
 270         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 271                 AXP288_FG_OCV_CAP_REG,
 272                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 273         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 274                 AXP288_FG_CC_CAP_REG,
 275                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 276         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 277                 AXP288_FG_LOW_CAP_REG,
 278                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 279         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 280                 AXP288_FG_TUNE0,
 281                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 282         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 283                 AXP288_FG_TUNE1,
 284                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 285         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 286                 AXP288_FG_TUNE2,
 287                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 288         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 289                 AXP288_FG_TUNE3,
 290                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 291         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 292                 AXP288_FG_TUNE4,
 293                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 294         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 295                 AXP288_FG_TUNE5,
 296                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 297
 298         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 299         if (ret >= 0)
 300                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 301         ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
 302         if (ret >= 0)
 303                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 304         ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
 305         if (ret >= 0)
 306                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 307         ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
 308         if (ret >= 0)
 309                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 310         ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
 311         if (ret >= 0)
 312                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 313         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 314         if (ret >= 0)
 315                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 316
 317         return 0;
 318 }
 319
 320 static int debug_open(struct inode *inode, struct file *file)
 321 {
 322         return single_open(file, fuel_gauge_debug_show, inode->i_private);
 323 }
 324
 325 static const struct file_operations fg_debug_fops = {
 326         .open       = debug_open,
 327         .read       = seq_read,
 328         .llseek     = seq_lseek,
 329         .release    = single_release,
 330 };
 331
 332 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 333 {
 334         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 335                 info, &fg_debug_fops);
 336 }
 337
 338 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 339 {
 340         debugfs_remove(info->debug_file);
 341 }
 342 #else
 343 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 344 {
 345 }
 346 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 347 {
 348 }
 349 #endif
 350
 351 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 352 {
 353         int pwr_stat, ret;
 354         int charge, discharge;
 355
 356         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 357         if (pwr_stat < 0) {
 358                 dev_err(&info->pdev->dev,
 359                         "PWR STAT read failed:%d\n", pwr_stat);
 360                 return;
 361         }
 362         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 363         if (ret < 0) {
 364                 dev_err(&info->pdev->dev,
 365                         "ADC charge current read failed:%d\n", ret);
 366                 return;
 367         }
 368         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 369         if (ret < 0) {
 370                 dev_err(&info->pdev->dev,
 371                         "ADC discharge current read failed:%d\n", ret);
 372                 return;
 373         }
 374
 375         if (charge > 0)
 376                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 377         else if (discharge > 0)
 378                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 379         else {
 380                 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
 381                         info->status = POWER_SUPPLY_STATUS_FULL;
 382                 else
 383                         info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 384         }
 385 }
 386
 387 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 388 {
 389         int ret = 0, raw_val;
 390
 391         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 392         if (ret < 0)
 393                 goto vbatt_read_fail;
 394
 395         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 396 vbatt_read_fail:
 397         return ret;
 398 }
 399
 400 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 401 {
 402         int ret, value = 0;
 403         int charge, discharge;
 404
 405         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 406         if (ret < 0)
 407                 goto current_read_fail;
 408         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 409         if (ret < 0)
 410                 goto current_read_fail;
 411
 412         if (charge > 0)
 413                 value = charge;
 414         else if (discharge > 0)
 415                 value = -1 * discharge;
 416
 417         *cur = value;
 418 current_read_fail:
 419         return ret;
 420 }
 421
 422 static int temp_to_adc(struct axp288_fg_info *info, int tval)
 423 {
 424         int rntc = 0, i, ret, adc_val;
 425         int rmin, rmax, tmin, tmax;
 426         int tcsz = info->pdata->tcsz;
 427
 428         /* get the Rntc resitance value for this temp */
 429         if (tval > info->pdata->thermistor_curve[0][1]) {
 430                 rntc = info->pdata->thermistor_curve[0][0];
 431         } else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
 432                 rntc = info->pdata->thermistor_curve[tcsz-1][0];
 433         } else {
 434                 for (i = 1; i < tcsz; i++) {
 435                         if (tval > info->pdata->thermistor_curve[i][1]) {
 436                                 rmin = info->pdata->thermistor_curve[i-1][0];
 437                                 rmax = info->pdata->thermistor_curve[i][0];
 438                                 tmin = info->pdata->thermistor_curve[i-1][1];
 439                                 tmax = info->pdata->thermistor_curve[i][1];
 440                                 rntc = rmin + ((rmax - rmin) *
 441                                         (tval - tmin) / (tmax - tmin));
 442                                 break;
 443                         }
 444                 }
 445         }
 446
 447         /* we need the current to calculate the proper adc voltage */
 448         ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
 449         if (ret < 0) {
 450                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 451                 ret = 0x30;
 452         }
 453
 454         /*
 455          * temperature is proportional to NTS thermistor resistance
 456          * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
 457          * [12-bit ADC VAL] = R_NTC(Ω) * current / 800
 458          */
 459         adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
 460
 461         return adc_val;
 462 }
 463
 464 static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
 465 {
 466         int ret, r, i, tval = 0;
 467         int rmin, rmax, tmin, tmax;
 468         int tcsz = info->pdata->tcsz;
 469
 470         ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
 471         if (ret < 0) {
 472                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 473                 ret = 0x30;
 474         }
 475
 476         /*
 477          * temperature is proportional to NTS thermistor resistance
 478          * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
 479          * R_NTC(Ω) = [12-bit ADC VAL] * 800 / current
 480          */
 481         r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
 482
 483         if (r < info->pdata->thermistor_curve[0][0]) {
 484                 tval = info->pdata->thermistor_curve[0][1];
 485         } else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
 486                 tval = info->pdata->thermistor_curve[tcsz-1][1];
 487         } else {
 488                 for (i = 1; i < tcsz; i++) {
 489                         if (r < info->pdata->thermistor_curve[i][0]) {
 490                                 rmin = info->pdata->thermistor_curve[i-1][0];
 491                                 rmax = info->pdata->thermistor_curve[i][0];
 492                                 tmin = info->pdata->thermistor_curve[i-1][1];
 493                                 tmax = info->pdata->thermistor_curve[i][1];
 494                                 tval = tmin + ((tmax - tmin) *
 495                                         (r - rmin) / (rmax - rmin));
 496                                 break;
 497                         }
 498                 }
 499         }
 500
 501         return tval;
 502 }
 503
 504 static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
 505 {
 506         int ret, raw_val = 0;
 507
 508         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 509         if (ret < 0)
 510                 goto temp_read_fail;
 511
 512         *btemp = adc_to_temp(info, raw_val);
 513
 514 temp_read_fail:
 515         return ret;
 516 }
 517
 518 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 519 {
 520         int ret, value;
 521
 522         /* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
 523         ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
 524         if (ret < 0)
 525                 goto vocv_read_fail;
 526         value = ret << 4;
 527
 528         ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
 529         if (ret < 0)
 530                 goto vocv_read_fail;
 531         value |= (ret & 0xf);
 532
 533         *vocv = VOLTAGE_FROM_ADC(value);
 534 vocv_read_fail:
 535         return ret;
 536 }
 537
 538 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 539 {
 540         int temp, vocv;
 541         int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 542
 543         ret = fuel_gauge_get_btemp(info, &temp);
 544         if (ret < 0)
 545                 goto health_read_fail;
 546
 547         ret = fuel_gauge_get_vocv(info, &vocv);
 548         if (ret < 0)
 549                 goto health_read_fail;
 550
 551         if (vocv > info->pdata->max_volt)
 552                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 553         else if (temp > info->pdata->max_temp)
 554                 health = POWER_SUPPLY_HEALTH_OVERHEAT;
 555         else if (temp < info->pdata->min_temp)
 556                 health = POWER_SUPPLY_HEALTH_COLD;
 557         else if (vocv < info->pdata->min_volt)
 558                 health = POWER_SUPPLY_HEALTH_DEAD;
 559         else
 560                 health = POWER_SUPPLY_HEALTH_GOOD;
 561
 562 health_read_fail:
 563         return health;
 564 }
 565
 566 static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
 567 {
 568         int ret, adc_val;
 569
 570         /* program temperature threshold as 1/16 ADC value */
 571         adc_val = temp_to_adc(info, info->pdata->max_temp);
 572         ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
 573
 574         return ret;
 575 }
 576
 577 static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
 578 {
 579         int ret, adc_val;
 580
 581         /* program temperature threshold as 1/16 ADC value */
 582         adc_val = temp_to_adc(info, info->pdata->min_temp);
 583         ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
 584
 585         return ret;
 586 }
 587
 588 static int fuel_gauge_get_property(struct power_supply *ps,
 589                 enum power_supply_property prop,
 590                 union power_supply_propval *val)
 591 {
 592         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 593         int ret = 0, value;
 594
 595         mutex_lock(&info->lock);
 596         switch (prop) {
 597         case POWER_SUPPLY_PROP_STATUS:
 598                 fuel_gauge_get_status(info);
 599                 val->intval = info->status;
 600                 break;
 601         case POWER_SUPPLY_PROP_HEALTH:
 602                 val->intval = fuel_gauge_battery_health(info);
 603                 break;
 604         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 605                 ret = fuel_gauge_get_vbatt(info, &value);
 606                 if (ret < 0)
 607                         goto fuel_gauge_read_err;
 608                 val->intval = PROP_VOLT(value);
 609                 break;
 610         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 611                 ret = fuel_gauge_get_vocv(info, &value);
 612                 if (ret < 0)
 613                         goto fuel_gauge_read_err;
 614                 val->intval = PROP_VOLT(value);
 615                 break;
 616         case POWER_SUPPLY_PROP_CURRENT_NOW:
 617                 ret = fuel_gauge_get_current(info, &value);
 618                 if (ret < 0)
 619                         goto fuel_gauge_read_err;
 620                 val->intval = PROP_CURR(value);
 621                 break;
 622         case POWER_SUPPLY_PROP_PRESENT:
 623                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 624                 if (ret < 0)
 625                         goto fuel_gauge_read_err;
 626
 627                 if (ret & CHRG_STAT_BAT_PRESENT)
 628                         val->intval = 1;
 629                 else
 630                         val->intval = 0;
 631                 break;
 632         case POWER_SUPPLY_PROP_CAPACITY:
 633                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 634                 if (ret < 0)
 635                         goto fuel_gauge_read_err;
 636
 637                 if (!(ret & FG_REP_CAP_VALID))
 638                         dev_err(&info->pdev->dev,
 639                                 "capacity measurement not valid\n");
 640                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 641                 break;
 642         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 643                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 644                 if (ret < 0)
 645                         goto fuel_gauge_read_err;
 646                 val->intval = (ret & 0x0f);
 647                 break;
 648         case POWER_SUPPLY_PROP_TEMP:
 649                 ret = fuel_gauge_get_btemp(info, &value);
 650                 if (ret < 0)
 651                         goto fuel_gauge_read_err;
 652                 val->intval = PROP_TEMP(value);
 653                 break;
 654         case POWER_SUPPLY_PROP_TEMP_MAX:
 655         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 656                 val->intval = PROP_TEMP(info->pdata->max_temp);
 657                 break;
 658         case POWER_SUPPLY_PROP_TEMP_MIN:
 659         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 660                 val->intval = PROP_TEMP(info->pdata->min_temp);
 661                 break;
 662         case POWER_SUPPLY_PROP_TECHNOLOGY:
 663                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 664                 break;
 665         case POWER_SUPPLY_PROP_CHARGE_NOW:
 666                 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
 667                 if (ret < 0)
 668                         goto fuel_gauge_read_err;
 669
 670                 value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
 671                 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
 672                 if (ret < 0)
 673                         goto fuel_gauge_read_err;
 674                 value |= (ret & FG_CC_MTR0_VAL_MASK);
 675                 val->intval = value * FG_DES_CAP_RES_LSB;
 676                 break;
 677         case POWER_SUPPLY_PROP_CHARGE_FULL:
 678                 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 679                 if (ret < 0)
 680                         goto fuel_gauge_read_err;
 681
 682                 value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
 683                 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
 684                 if (ret < 0)
 685                         goto fuel_gauge_read_err;
 686                 value |= (ret & FG_DES_CAP0_VAL_MASK);
 687                 val->intval = value * FG_DES_CAP_RES_LSB;
 688                 break;
 689         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 690                 val->intval = PROP_CURR(info->pdata->design_cap);
 691                 break;
 692         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 693                 val->intval = PROP_VOLT(info->pdata->max_volt);
 694                 break;
 695         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 696                 val->intval = PROP_VOLT(info->pdata->min_volt);
 697                 break;
 698         case POWER_SUPPLY_PROP_MODEL_NAME:
 699                 val->strval = info->pdata->battid;
 700                 break;
 701         default:
 702                 mutex_unlock(&info->lock);
 703                 return -EINVAL;
 704         }
 705
 706         mutex_unlock(&info->lock);
 707         return 0;
 708
 709 fuel_gauge_read_err:
 710         mutex_unlock(&info->lock);
 711         return ret;
 712 }
 713
 714 static int fuel_gauge_set_property(struct power_supply *ps,
 715                 enum power_supply_property prop,
 716                 const union power_supply_propval *val)
 717 {
 718         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 719         int ret = 0;
 720
 721         mutex_lock(&info->lock);
 722         switch (prop) {
 723         case POWER_SUPPLY_PROP_STATUS:
 724                 info->status = val->intval;
 725                 break;
 726         case POWER_SUPPLY_PROP_TEMP_MIN:
 727         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 728                 if ((val->intval < PD_DEF_MIN_TEMP) ||
 729                         (val->intval > PD_DEF_MAX_TEMP)) {
 730                         ret = -EINVAL;
 731                         break;
 732                 }
 733                 info->pdata->min_temp = UNPROP_TEMP(val->intval);
 734                 ret = fuel_gauge_set_low_btemp_alert(info);
 735                 if (ret < 0)
 736                         dev_err(&info->pdev->dev,
 737                                 "temp alert min set fail:%d\n", ret);
 738                 break;
 739         case POWER_SUPPLY_PROP_TEMP_MAX:
 740         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 741                 if ((val->intval < PD_DEF_MIN_TEMP) ||
 742                         (val->intval > PD_DEF_MAX_TEMP)) {
 743                         ret = -EINVAL;
 744                         break;
 745                 }
 746                 info->pdata->max_temp = UNPROP_TEMP(val->intval);
 747                 ret = fuel_gauge_set_high_btemp_alert(info);
 748                 if (ret < 0)
 749                         dev_err(&info->pdev->dev,
 750                                 "temp alert max set fail:%d\n", ret);
 751                 break;
 752         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 753                 if ((val->intval < 0) || (val->intval > 15)) {
 754                         ret = -EINVAL;
 755                         break;
 756                 }
 757                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 758                 if (ret < 0)
 759                         break;
 760                 ret &= 0xf0;
 761                 ret |= (val->intval & 0xf);
 762                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 763                 break;
 764         default:
 765                 ret = -EINVAL;
 766                 break;
 767         }
 768
 769         mutex_unlock(&info->lock);
 770         return ret;
 771 }
 772
 773 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 774         enum power_supply_property psp)
 775 {
 776         int ret;
 777
 778         switch (psp) {
 779         case POWER_SUPPLY_PROP_STATUS:
 780         case POWER_SUPPLY_PROP_TEMP_MIN:
 781         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 782         case POWER_SUPPLY_PROP_TEMP_MAX:
 783         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 784         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 785                 ret = 1;
 786                 break;
 787         default:
 788                 ret = 0;
 789         }
 790
 791         return ret;
 792 }
 793
 794 static void fuel_gauge_status_monitor(struct work_struct *work)
 795 {
 796         struct axp288_fg_info *info = container_of(work,
 797                 struct axp288_fg_info, status_monitor.work);
 798
 799         fuel_gauge_get_status(info);
 800         power_supply_changed(info->bat);
 801         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 802 }
 803
 804 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 805 {
 806         struct axp288_fg_info *info = dev;
 807         int i;
 808
 809         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 810                 if (info->irq[i] == irq)
 811                         break;
 812         }
 813
 814         if (i >= AXP288_FG_INTR_NUM) {
 815                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 816                 return IRQ_NONE;
 817         }
 818
 819         switch (i) {
 820         case QWBTU_IRQ:
 821                 dev_info(&info->pdev->dev,
 822                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 823                 break;
 824         case WBTU_IRQ:
 825                 dev_info(&info->pdev->dev,
 826                         "Battery under temperature in work mode IRQ (WBTU)\n");
 827                 break;
 828         case QWBTO_IRQ:
 829                 dev_info(&info->pdev->dev,
 830                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 831                 break;
 832         case WBTO_IRQ:
 833                 dev_info(&info->pdev->dev,
 834                         "Battery over temperature in work mode IRQ (WBTO)\n");
 835                 break;
 836         case WL2_IRQ:
 837                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 838                 break;
 839         case WL1_IRQ:
 840                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 841                 break;
 842         default:
 843                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 844         }
 845
 846         power_supply_changed(info->bat);
 847         return IRQ_HANDLED;
 848 }
 849
 850 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 851 {
 852         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 853
 854         power_supply_changed(info->bat);
 855 }
 856
 857 static const struct power_supply_desc fuel_gauge_desc = {
 858         .name                   = DEV_NAME,
 859         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 860         .properties             = fuel_gauge_props,
 861         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 862         .get_property           = fuel_gauge_get_property,
 863         .set_property           = fuel_gauge_set_property,
 864         .property_is_writeable  = fuel_gauge_property_is_writeable,
 865         .external_power_changed = fuel_gauge_external_power_changed,
 866 };
 867
 868 static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
 869 {
 870         int ret;
 871         u8 reg_val;
 872
 873         ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 874         if (ret < 0) {
 875                 dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
 876                 return ret;
 877         }
 878         ret = (ret & FG_REP_CAP_VAL_MASK);
 879
 880         if (ret > FG_LOW_CAP_WARN_THR)
 881                 reg_val = FG_LOW_CAP_WARN_THR;
 882         else if (ret > FG_LOW_CAP_CRIT_THR)
 883                 reg_val = FG_LOW_CAP_CRIT_THR;
 884         else
 885                 reg_val = FG_LOW_CAP_SHDN_THR;
 886
 887         reg_val |= FG_LOW_CAP_THR1_VAL;
 888         ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
 889         if (ret < 0)
 890                 dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
 891
 892         return ret;
 893 }
 894
 895 static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
 896 {
 897         int ret;
 898         u8 val;
 899
 900         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 901         if (ret < 0)
 902                 goto fg_prog_ocv_fail;
 903         else
 904                 val = (ret & ~CHRG_CCCV_CV_MASK);
 905
 906         switch (info->pdata->max_volt) {
 907         case CV_4100:
 908                 val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
 909                 break;
 910         case CV_4150:
 911                 val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
 912                 break;
 913         case CV_4200:
 914                 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
 915                 break;
 916         case CV_4350:
 917                 val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
 918                 break;
 919         default:
 920                 val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
 921                 break;
 922         }
 923
 924         ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
 925 fg_prog_ocv_fail:
 926         return ret;
 927 }
 928
 929 static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
 930 {
 931         int ret;
 932
 933         ret = fuel_gauge_reg_writeb(info,
 934                 AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
 935         if (ret < 0)
 936                 goto fg_prog_descap_fail;
 937
 938         ret = fuel_gauge_reg_writeb(info,
 939                 AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
 940
 941 fg_prog_descap_fail:
 942         return ret;
 943 }
 944
 945 static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
 946 {
 947         int ret = 0, i;
 948
 949         for (i = 0; i < OCV_CURVE_SIZE; i++) {
 950                 ret = fuel_gauge_reg_writeb(info,
 951                         AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
 952                 if (ret < 0)
 953                         goto fg_prog_ocv_fail;
 954         }
 955
 956 fg_prog_ocv_fail:
 957         return ret;
 958 }
 959
 960 static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
 961 {
 962         int ret;
 963
 964         ret = fuel_gauge_reg_writeb(info,
 965                 AXP288_FG_RDC1_REG, info->pdata->rdc1);
 966         if (ret < 0)
 967                 goto fg_prog_ocv_fail;
 968
 969         ret = fuel_gauge_reg_writeb(info,
 970                 AXP288_FG_RDC0_REG, info->pdata->rdc0);
 971
 972 fg_prog_ocv_fail:
 973         return ret;
 974 }
 975
 976 static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
 977 {
 978         int ret;
 979
 980         /*
 981          * check if the config data is already
 982          * programmed and if so just return.
 983          */
 984
 985         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 986         if (ret < 0) {
 987                 dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
 988         } else if (!(ret & FG_DES_CAP1_VALID)) {
 989                 dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
 990         } else {
 991                 dev_info(&info->pdev->dev, "FG data is already initialized\n");
 992                 return;
 993         }
 994
 995         ret = fuel_gauge_program_vbatt_full(info);
 996         if (ret < 0)
 997                 dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
 998
 999         ret = fuel_gauge_program_design_cap(info);
1000         if (ret < 0)
1001                 dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
1002
1003         ret = fuel_gauge_program_rdc_vals(info);
1004         if (ret < 0)
1005                 dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
1006
1007         ret = fuel_gauge_program_ocv_curve(info);
1008         if (ret < 0)
1009                 dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
1010
1011         ret = fuel_gauge_set_lowbatt_thresholds(info);
1012         if (ret < 0)
1013                 dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
1014
1015         ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
1016         if (ret < 0)
1017                 dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
1018 }
1019
1020 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
1021 {
1022         int ret, i, pirq;
1023
1024         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
1025                 pirq = platform_get_irq(info->pdev, i);
1026                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
1027                 if (info->irq[i] < 0) {
1028                         dev_warn(&info->pdev->dev,
1029                                 "regmap_irq get virq failed for IRQ %d: %d\n",
1030                                 pirq, info->irq[i]);
1031                         info->irq[i] = -1;
1032                         goto intr_failed;
1033                 }
1034                 ret = request_threaded_irq(info->irq[i],
1035                                 NULL, fuel_gauge_thread_handler,
1036                                 IRQF_ONESHOT, DEV_NAME, info);
1037                 if (ret) {
1038                         dev_warn(&info->pdev->dev,
1039                                 "request irq failed for IRQ %d: %d\n",
1040                                 pirq, info->irq[i]);
1041                         info->irq[i] = -1;
1042                         goto intr_failed;
1043                 } else {
1044                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
1045                                 pirq, info->irq[i]);
1046                 }
1047         }
1048         return;
1049
1050 intr_failed:
1051         for (; i > 0; i--) {
1052                 free_irq(info->irq[i - 1], info);
1053                 info->irq[i - 1] = -1;
1054         }
1055 }
1056
1057 static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
1058 {
1059         int ret;
1060         unsigned int val;
1061
1062         ret = fuel_gauge_set_high_btemp_alert(info);
1063         if (ret < 0)
1064                 dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
1065
1066         ret = fuel_gauge_set_low_btemp_alert(info);
1067         if (ret < 0)
1068                 dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
1069
1070         /* enable interrupts */
1071         val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
1072         val |= TEMP_IRQ_CFG_MASK;
1073         fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
1074
1075         val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
1076         val |= FG_IRQ_CFG_LOWBATT_MASK;
1077         val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
1078 }
1079
1080 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
1081 {
1082         int ret = 0;
1083         struct axp288_fg_info *info;
1084         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
1085         struct power_supply_config psy_cfg = {};
1086
1087         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1088         if (!info)
1089                 return -ENOMEM;
1090
1091         info->pdev = pdev;
1092         info->regmap = axp20x->regmap;
1093         info->regmap_irqc = axp20x->regmap_irqc;
1094         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
1095         info->pdata = pdev->dev.platform_data;
1096         if (!info->pdata)
1097                 return -ENODEV;
1098
1099         platform_set_drvdata(pdev, info);
1100
1101         mutex_init(&info->lock);
1102         INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
1103
1104         psy_cfg.drv_data = info;
1105         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
1106         if (IS_ERR(info->bat)) {
1107                 ret = PTR_ERR(info->bat);
1108                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
1109                 return ret;
1110         }
1111
1112         fuel_gauge_create_debugfs(info);
1113         fuel_gauge_init_config_regs(info);
1114         fuel_gauge_init_irq(info);
1115         fuel_gauge_init_hw_regs(info);
1116         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
1117
1118         return ret;
1119 }
1120
1121 static const struct platform_device_id axp288_fg_id_table[] = {
1122         { .name = DEV_NAME },
1123         {},
1124 };
1125 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
1126
1127 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
1128 {
1129         struct axp288_fg_info *info = platform_get_drvdata(pdev);
1130         int i;
1131
1132         cancel_delayed_work_sync(&info->status_monitor);
1133         power_supply_unregister(info->bat);
1134         fuel_gauge_remove_debugfs(info);
1135
1136         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
1137                 if (info->irq[i] >= 0)
1138                         free_irq(info->irq[i], info);
1139
1140         return 0;
1141 }
1142
1143 static struct platform_driver axp288_fuel_gauge_driver = {
1144         .probe = axp288_fuel_gauge_probe,
1145         .remove = axp288_fuel_gauge_remove,
1146         .id_table = axp288_fg_id_table,
1147         .driver = {
1148                 .name = DEV_NAME,
1149         },
1150 };
1151
1152 module_platform_driver(axp288_fuel_gauge_driver);
1153
1154 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
1155 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
1156 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
1157 MODULE_LICENSE("GPL");