drivers/power/supply/axp288_fuel_gauge.c

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