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 TEMP_IRQ_CFG_QWBTU                      (1 << 0)
  54 #define TEMP_IRQ_CFG_WBTU                       (1 << 1)
  55 #define TEMP_IRQ_CFG_QWBTO                      (1 << 2)
  56 #define TEMP_IRQ_CFG_WBTO                       (1 << 3)
  57 #define TEMP_IRQ_CFG_MASK                       0xf
  58
  59 #define FG_IRQ_CFG_LOWBATT_WL2          (1 << 0)
  60 #define FG_IRQ_CFG_LOWBATT_WL1          (1 << 1)
  61 #define FG_IRQ_CFG_LOWBATT_MASK         0x3
  62 #define LOWBAT_IRQ_STAT_LOWBATT_WL2     (1 << 0)
  63 #define LOWBAT_IRQ_STAT_LOWBATT_WL1     (1 << 1)
  64
  65 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  66 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  67 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  68 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  69 #define FG_CNTL_CC_EN                           (1 << 6)
  70 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  71
  72 #define FG_15BIT_WORD_VALID                     (1 << 15)
  73 #define FG_15BIT_VAL_MASK                       0x7fff
  74
  75 #define FG_REP_CAP_VALID                        (1 << 7)
  76 #define FG_REP_CAP_VAL_MASK                     0x7F
  77
  78 #define FG_DES_CAP1_VALID                       (1 << 7)
  79 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  80
  81 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  82
  83 #define FG_OCV_CAP_VALID                        (1 << 7)
  84 #define FG_OCV_CAP_VAL_MASK                     0x7F
  85 #define FG_CC_CAP_VALID                         (1 << 7)
  86 #define FG_CC_CAP_VAL_MASK                      0x7F
  87
  88 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  89 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  90 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  91 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  92 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  93 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  94
  95 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
  96 #define NR_RETRY_CNT    3
  97 #define DEV_NAME        "axp288_fuel_gauge"
  98
  99 /* 1.1mV per LSB expressed in uV */
 100 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
 101 /* properties converted to uV, uA */
 102 #define PROP_VOLT(a)            ((a) * 1000)
 103 #define PROP_CURR(a)            ((a) * 1000)
 104
 105 #define AXP288_FG_INTR_NUM      6
 106 enum {
 107         QWBTU_IRQ = 0,
 108         WBTU_IRQ,
 109         QWBTO_IRQ,
 110         WBTO_IRQ,
 111         WL2_IRQ,
 112         WL1_IRQ,
 113 };
 114
 115 struct axp288_fg_info {
 116         struct platform_device *pdev;
 117         struct regmap *regmap;
 118         struct regmap_irq_chip_data *regmap_irqc;
 119         int irq[AXP288_FG_INTR_NUM];
 120         struct power_supply *bat;
 121         struct mutex lock;
 122         int status;
 123         int max_volt;
 124         struct delayed_work status_monitor;
 125         struct dentry *debug_file;
 126 };
 127
 128 static enum power_supply_property fuel_gauge_props[] = {
 129         POWER_SUPPLY_PROP_STATUS,
 130         POWER_SUPPLY_PROP_PRESENT,
 131         POWER_SUPPLY_PROP_HEALTH,
 132         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 133         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 134         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 135         POWER_SUPPLY_PROP_CURRENT_NOW,
 136         POWER_SUPPLY_PROP_CAPACITY,
 137         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 138         POWER_SUPPLY_PROP_TECHNOLOGY,
 139         POWER_SUPPLY_PROP_CHARGE_FULL,
 140         POWER_SUPPLY_PROP_CHARGE_NOW,
 141 };
 142
 143 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 144 {
 145         int ret, i;
 146         unsigned int val;
 147
 148         for (i = 0; i < NR_RETRY_CNT; i++) {
 149                 ret = regmap_read(info->regmap, reg, &val);
 150                 if (ret == -EBUSY)
 151                         continue;
 152                 else
 153                         break;
 154         }
 155
 156         if (ret < 0) {
 157                 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
 158                 return ret;
 159         }
 160
 161         return val;
 162 }
 163
 164 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 165 {
 166         int ret;
 167
 168         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 169
 170         if (ret < 0)
 171                 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
 172
 173         return ret;
 174 }
 175
 176 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 177 {
 178         unsigned char buf[2];
 179         int ret;
 180
 181         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 182         if (ret < 0) {
 183                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 184                         reg, ret);
 185                 return ret;
 186         }
 187
 188         ret = get_unaligned_be16(buf);
 189         if (!(ret & FG_15BIT_WORD_VALID)) {
 190                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
 191                         reg);
 192                 return -ENXIO;
 193         }
 194
 195         return ret & FG_15BIT_VAL_MASK;
 196 }
 197
 198 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 199 {
 200         unsigned char buf[2];
 201         int ret;
 202
 203         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 204         if (ret < 0) {
 205                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 206                         reg, ret);
 207                 return ret;
 208         }
 209
 210         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 211         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 212 }
 213
 214 static int pmic_read_adc_val(const char *name, int *raw_val,
 215                 struct axp288_fg_info *info)
 216 {
 217         int ret, val = 0;
 218         struct iio_channel *indio_chan;
 219
 220         indio_chan = iio_channel_get(NULL, name);
 221         if (IS_ERR_OR_NULL(indio_chan)) {
 222                 ret = PTR_ERR(indio_chan);
 223                 goto exit;
 224         }
 225         ret = iio_read_channel_raw(indio_chan, &val);
 226         if (ret < 0) {
 227                 dev_err(&info->pdev->dev,
 228                         "IIO channel read error: %x, %x\n", ret, val);
 229                 goto err_exit;
 230         }
 231
 232         dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
 233         *raw_val = val;
 234
 235 err_exit:
 236         iio_channel_release(indio_chan);
 237 exit:
 238         return ret;
 239 }
 240
 241 #ifdef CONFIG_DEBUG_FS
 242 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 243 {
 244         struct axp288_fg_info *info = s->private;
 245         int raw_val, ret;
 246
 247         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 248                 AXP20X_PWR_INPUT_STATUS,
 249                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 250         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 251                 AXP20X_PWR_OP_MODE,
 252                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 253         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 254                 AXP20X_CHRG_CTRL1,
 255                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 256         seq_printf(s, "       VLTF[%02x] : %02x\n",
 257                 AXP20X_V_LTF_DISCHRG,
 258                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 259         seq_printf(s, "       VHTF[%02x] : %02x\n",
 260                 AXP20X_V_HTF_DISCHRG,
 261                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 262         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 263                 AXP20X_CC_CTRL,
 264                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 265         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 266                 AXP20X_FG_RES,
 267                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 268         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 269                 AXP288_FG_RDC1_REG,
 270                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 271         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 272                 AXP288_FG_RDC0_REG,
 273                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 274         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
 275                 AXP288_FG_OCVH_REG,
 276                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
 277         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
 278                 AXP288_FG_DES_CAP1_REG,
 279                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
 280         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
 281                 AXP288_FG_CC_MTR1_REG,
 282                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
 283         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 284                 AXP288_FG_OCV_CAP_REG,
 285                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 286         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 287                 AXP288_FG_CC_CAP_REG,
 288                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 289         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 290                 AXP288_FG_LOW_CAP_REG,
 291                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 292         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 293                 AXP288_FG_TUNE0,
 294                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 295         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 296                 AXP288_FG_TUNE1,
 297                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 298         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 299                 AXP288_FG_TUNE2,
 300                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 301         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 302                 AXP288_FG_TUNE3,
 303                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 304         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 305                 AXP288_FG_TUNE4,
 306                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 307         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 308                 AXP288_FG_TUNE5,
 309                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 310
 311         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 312         if (ret >= 0)
 313                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 314         ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
 315         if (ret >= 0)
 316                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 317         ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
 318         if (ret >= 0)
 319                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 320         ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
 321         if (ret >= 0)
 322                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 323         ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
 324         if (ret >= 0)
 325                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 326         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 327         if (ret >= 0)
 328                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 329
 330         return 0;
 331 }
 332
 333 static int debug_open(struct inode *inode, struct file *file)
 334 {
 335         return single_open(file, fuel_gauge_debug_show, inode->i_private);
 336 }
 337
 338 static const struct file_operations fg_debug_fops = {
 339         .open       = debug_open,
 340         .read       = seq_read,
 341         .llseek     = seq_lseek,
 342         .release    = single_release,
 343 };
 344
 345 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 346 {
 347         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 348                 info, &fg_debug_fops);
 349 }
 350
 351 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 352 {
 353         debugfs_remove(info->debug_file);
 354 }
 355 #else
 356 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 357 {
 358 }
 359 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 360 {
 361 }
 362 #endif
 363
 364 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 365 {
 366         int pwr_stat, ret;
 367         int charge, discharge;
 368
 369         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 370         if (pwr_stat < 0) {
 371                 dev_err(&info->pdev->dev,
 372                         "PWR STAT read failed:%d\n", pwr_stat);
 373                 return;
 374         }
 375         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 376         if (ret < 0) {
 377                 dev_err(&info->pdev->dev,
 378                         "ADC charge current read failed:%d\n", ret);
 379                 return;
 380         }
 381         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 382         if (ret < 0) {
 383                 dev_err(&info->pdev->dev,
 384                         "ADC discharge current read failed:%d\n", ret);
 385                 return;
 386         }
 387
 388         if (charge > 0)
 389                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 390         else if (discharge > 0)
 391                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 392         else {
 393                 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
 394                         info->status = POWER_SUPPLY_STATUS_FULL;
 395                 else
 396                         info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 397         }
 398 }
 399
 400 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 401 {
 402         int ret = 0, raw_val;
 403
 404         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 405         if (ret < 0)
 406                 goto vbatt_read_fail;
 407
 408         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 409 vbatt_read_fail:
 410         return ret;
 411 }
 412
 413 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 414 {
 415         int ret, value = 0;
 416         int charge, discharge;
 417
 418         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 419         if (ret < 0)
 420                 goto current_read_fail;
 421         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 422         if (ret < 0)
 423                 goto current_read_fail;
 424
 425         if (charge > 0)
 426                 value = charge;
 427         else if (discharge > 0)
 428                 value = -1 * discharge;
 429
 430         *cur = value;
 431 current_read_fail:
 432         return ret;
 433 }
 434
 435 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 436 {
 437         int ret;
 438
 439         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 440         if (ret >= 0)
 441                 *vocv = VOLTAGE_FROM_ADC(ret);
 442
 443         return ret;
 444 }
 445
 446 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 447 {
 448         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 449
 450         ret = fuel_gauge_get_vocv(info, &vocv);
 451         if (ret < 0)
 452                 goto health_read_fail;
 453
 454         if (vocv > info->max_volt)
 455                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 456         else
 457                 health = POWER_SUPPLY_HEALTH_GOOD;
 458
 459 health_read_fail:
 460         return health;
 461 }
 462
 463 static int fuel_gauge_get_property(struct power_supply *ps,
 464                 enum power_supply_property prop,
 465                 union power_supply_propval *val)
 466 {
 467         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 468         int ret = 0, value;
 469
 470         mutex_lock(&info->lock);
 471         switch (prop) {
 472         case POWER_SUPPLY_PROP_STATUS:
 473                 fuel_gauge_get_status(info);
 474                 val->intval = info->status;
 475                 break;
 476         case POWER_SUPPLY_PROP_HEALTH:
 477                 val->intval = fuel_gauge_battery_health(info);
 478                 break;
 479         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 480                 ret = fuel_gauge_get_vbatt(info, &value);
 481                 if (ret < 0)
 482                         goto fuel_gauge_read_err;
 483                 val->intval = PROP_VOLT(value);
 484                 break;
 485         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 486                 ret = fuel_gauge_get_vocv(info, &value);
 487                 if (ret < 0)
 488                         goto fuel_gauge_read_err;
 489                 val->intval = PROP_VOLT(value);
 490                 break;
 491         case POWER_SUPPLY_PROP_CURRENT_NOW:
 492                 ret = fuel_gauge_get_current(info, &value);
 493                 if (ret < 0)
 494                         goto fuel_gauge_read_err;
 495                 val->intval = PROP_CURR(value);
 496                 break;
 497         case POWER_SUPPLY_PROP_PRESENT:
 498                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 499                 if (ret < 0)
 500                         goto fuel_gauge_read_err;
 501
 502                 if (ret & CHRG_STAT_BAT_PRESENT)
 503                         val->intval = 1;
 504                 else
 505                         val->intval = 0;
 506                 break;
 507         case POWER_SUPPLY_PROP_CAPACITY:
 508                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 509                 if (ret < 0)
 510                         goto fuel_gauge_read_err;
 511
 512                 if (!(ret & FG_REP_CAP_VALID))
 513                         dev_err(&info->pdev->dev,
 514                                 "capacity measurement not valid\n");
 515                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 516                 break;
 517         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 518                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 519                 if (ret < 0)
 520                         goto fuel_gauge_read_err;
 521                 val->intval = (ret & 0x0f);
 522                 break;
 523         case POWER_SUPPLY_PROP_TECHNOLOGY:
 524                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 525                 break;
 526         case POWER_SUPPLY_PROP_CHARGE_NOW:
 527                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 528                 if (ret < 0)
 529                         goto fuel_gauge_read_err;
 530
 531                 val->intval = ret * FG_DES_CAP_RES_LSB;
 532                 break;
 533         case POWER_SUPPLY_PROP_CHARGE_FULL:
 534                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 535                 if (ret < 0)
 536                         goto fuel_gauge_read_err;
 537
 538                 val->intval = ret * FG_DES_CAP_RES_LSB;
 539                 break;
 540         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 541                 val->intval = PROP_VOLT(info->max_volt);
 542                 break;
 543         default:
 544                 mutex_unlock(&info->lock);
 545                 return -EINVAL;
 546         }
 547
 548         mutex_unlock(&info->lock);
 549         return 0;
 550
 551 fuel_gauge_read_err:
 552         mutex_unlock(&info->lock);
 553         return ret;
 554 }
 555
 556 static int fuel_gauge_set_property(struct power_supply *ps,
 557                 enum power_supply_property prop,
 558                 const union power_supply_propval *val)
 559 {
 560         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 561         int ret = 0;
 562
 563         mutex_lock(&info->lock);
 564         switch (prop) {
 565         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 566                 if ((val->intval < 0) || (val->intval > 15)) {
 567                         ret = -EINVAL;
 568                         break;
 569                 }
 570                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 571                 if (ret < 0)
 572                         break;
 573                 ret &= 0xf0;
 574                 ret |= (val->intval & 0xf);
 575                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 576                 break;
 577         default:
 578                 ret = -EINVAL;
 579                 break;
 580         }
 581
 582         mutex_unlock(&info->lock);
 583         return ret;
 584 }
 585
 586 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 587         enum power_supply_property psp)
 588 {
 589         int ret;
 590
 591         switch (psp) {
 592         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 593                 ret = 1;
 594                 break;
 595         default:
 596                 ret = 0;
 597         }
 598
 599         return ret;
 600 }
 601
 602 static void fuel_gauge_status_monitor(struct work_struct *work)
 603 {
 604         struct axp288_fg_info *info = container_of(work,
 605                 struct axp288_fg_info, status_monitor.work);
 606
 607         fuel_gauge_get_status(info);
 608         power_supply_changed(info->bat);
 609         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 610 }
 611
 612 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 613 {
 614         struct axp288_fg_info *info = dev;
 615         int i;
 616
 617         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 618                 if (info->irq[i] == irq)
 619                         break;
 620         }
 621
 622         if (i >= AXP288_FG_INTR_NUM) {
 623                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 624                 return IRQ_NONE;
 625         }
 626
 627         switch (i) {
 628         case QWBTU_IRQ:
 629                 dev_info(&info->pdev->dev,
 630                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 631                 break;
 632         case WBTU_IRQ:
 633                 dev_info(&info->pdev->dev,
 634                         "Battery under temperature in work mode IRQ (WBTU)\n");
 635                 break;
 636         case QWBTO_IRQ:
 637                 dev_info(&info->pdev->dev,
 638                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 639                 break;
 640         case WBTO_IRQ:
 641                 dev_info(&info->pdev->dev,
 642                         "Battery over temperature in work mode IRQ (WBTO)\n");
 643                 break;
 644         case WL2_IRQ:
 645                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 646                 break;
 647         case WL1_IRQ:
 648                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 649                 break;
 650         default:
 651                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 652         }
 653
 654         power_supply_changed(info->bat);
 655         return IRQ_HANDLED;
 656 }
 657
 658 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 659 {
 660         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 661
 662         power_supply_changed(info->bat);
 663 }
 664
 665 static const struct power_supply_desc fuel_gauge_desc = {
 666         .name                   = DEV_NAME,
 667         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 668         .properties             = fuel_gauge_props,
 669         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 670         .get_property           = fuel_gauge_get_property,
 671         .set_property           = fuel_gauge_set_property,
 672         .property_is_writeable  = fuel_gauge_property_is_writeable,
 673         .external_power_changed = fuel_gauge_external_power_changed,
 674 };
 675
 676 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
 677 {
 678         int ret, i, pirq;
 679
 680         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 681                 pirq = platform_get_irq(info->pdev, i);
 682                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 683                 if (info->irq[i] < 0) {
 684                         dev_warn(&info->pdev->dev,
 685                                 "regmap_irq get virq failed for IRQ %d: %d\n",
 686                                 pirq, info->irq[i]);
 687                         info->irq[i] = -1;
 688                         goto intr_failed;
 689                 }
 690                 ret = request_threaded_irq(info->irq[i],
 691                                 NULL, fuel_gauge_thread_handler,
 692                                 IRQF_ONESHOT, DEV_NAME, info);
 693                 if (ret) {
 694                         dev_warn(&info->pdev->dev,
 695                                 "request irq failed for IRQ %d: %d\n",
 696                                 pirq, info->irq[i]);
 697                         info->irq[i] = -1;
 698                         goto intr_failed;
 699                 } else {
 700                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
 701                                 pirq, info->irq[i]);
 702                 }
 703         }
 704         return;
 705
 706 intr_failed:
 707         for (; i > 0; i--) {
 708                 free_irq(info->irq[i - 1], info);
 709                 info->irq[i - 1] = -1;
 710         }
 711 }
 712
 713 static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
 714 {
 715         unsigned int val;
 716
 717         /* enable interrupts */
 718         val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
 719         val |= TEMP_IRQ_CFG_MASK;
 720         fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
 721
 722         val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
 723         val |= FG_IRQ_CFG_LOWBATT_MASK;
 724         val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
 725 }
 726
 727 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 728 {
 729         int ret = 0;
 730         struct axp288_fg_info *info;
 731         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 732         struct power_supply_config psy_cfg = {};
 733
 734         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 735         if (!info)
 736                 return -ENOMEM;
 737
 738         info->pdev = pdev;
 739         info->regmap = axp20x->regmap;
 740         info->regmap_irqc = axp20x->regmap_irqc;
 741         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 742
 743         platform_set_drvdata(pdev, info);
 744
 745         mutex_init(&info->lock);
 746         INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
 747
 748         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 749         if (ret < 0)
 750                 return ret;
 751
 752         if (!(ret & FG_DES_CAP1_VALID)) {
 753                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 754                 return -ENODEV;
 755         }
 756
 757         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 758         if (ret < 0)
 759                 return ret;
 760         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 761         case CHRG_CCCV_CV_4100MV:
 762                 info->max_volt = 4100;
 763                 break;
 764         case CHRG_CCCV_CV_4150MV:
 765                 info->max_volt = 4150;
 766                 break;
 767         case CHRG_CCCV_CV_4200MV:
 768                 info->max_volt = 4200;
 769                 break;
 770         case CHRG_CCCV_CV_4350MV:
 771                 info->max_volt = 4350;
 772                 break;
 773         }
 774
 775         psy_cfg.drv_data = info;
 776         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 777         if (IS_ERR(info->bat)) {
 778                 ret = PTR_ERR(info->bat);
 779                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 780                 return ret;
 781         }
 782
 783         fuel_gauge_create_debugfs(info);
 784         fuel_gauge_init_irq(info);
 785         fuel_gauge_init_hw_regs(info);
 786         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 787
 788         return 0;
 789 }
 790
 791 static const struct platform_device_id axp288_fg_id_table[] = {
 792         { .name = DEV_NAME },
 793         {},
 794 };
 795 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 796
 797 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 798 {
 799         struct axp288_fg_info *info = platform_get_drvdata(pdev);
 800         int i;
 801
 802         cancel_delayed_work_sync(&info->status_monitor);
 803         power_supply_unregister(info->bat);
 804         fuel_gauge_remove_debugfs(info);
 805
 806         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 807                 if (info->irq[i] >= 0)
 808                         free_irq(info->irq[i], info);
 809
 810         return 0;
 811 }
 812
 813 static struct platform_driver axp288_fuel_gauge_driver = {
 814         .probe = axp288_fuel_gauge_probe,
 815         .remove = axp288_fuel_gauge_remove,
 816         .id_table = axp288_fg_id_table,
 817         .driver = {
 818                 .name = DEV_NAME,
 819         },
 820 };
 821
 822 module_platform_driver(axp288_fuel_gauge_driver);
 823
 824 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 825 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 826 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 827 MODULE_LICENSE("GPL");