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