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