drivers/power/supply/axp288_fuel_gauge.c

   1 /*
   2  * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/mfd/axp20x.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/power_supply.h>
  29 #include <linux/iio/consumer.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/seq_file.h>
  32
  33 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  34 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  35 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  36 #define CHRG_STAT_CHARGING                      (1 << 6)
  37 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  38
  39 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  40 #define CHRG_CCCV_CC_BIT_POS            0
  41 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  42 #define CHRG_CCCV_CC_LSB_RES            200     /* 200mA */
  43 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  44 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  45 #define CHRG_CCCV_CV_BIT_POS            5
  46 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  47 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  48 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  49 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  50 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  51
  52 #define TEMP_IRQ_CFG_QWBTU                      (1 << 0)
  53 #define TEMP_IRQ_CFG_WBTU                       (1 << 1)
  54 #define TEMP_IRQ_CFG_QWBTO                      (1 << 2)
  55 #define TEMP_IRQ_CFG_WBTO                       (1 << 3)
  56 #define TEMP_IRQ_CFG_MASK                       0xf
  57
  58 #define FG_IRQ_CFG_LOWBATT_WL2          (1 << 0)
  59 #define FG_IRQ_CFG_LOWBATT_WL1          (1 << 1)
  60 #define FG_IRQ_CFG_LOWBATT_MASK         0x3
  61 #define LOWBAT_IRQ_STAT_LOWBATT_WL2     (1 << 0)
  62 #define LOWBAT_IRQ_STAT_LOWBATT_WL1     (1 << 1)
  63
  64 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  65 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  66 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  67 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  68 #define FG_CNTL_CC_EN                           (1 << 6)
  69 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  70
  71 #define FG_REP_CAP_VALID                        (1 << 7)
  72 #define FG_REP_CAP_VAL_MASK                     0x7F
  73
  74 #define FG_DES_CAP1_VALID                       (1 << 7)
  75 #define FG_DES_CAP1_VAL_MASK            0x7F
  76 #define FG_DES_CAP0_VAL_MASK            0xFF
  77 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  78
  79 #define FG_CC_MTR1_VALID                        (1 << 7)
  80 #define FG_CC_MTR1_VAL_MASK                     0x7F
  81 #define FG_CC_MTR0_VAL_MASK                     0xFF
  82 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  83
  84 #define FG_OCV_CAP_VALID                        (1 << 7)
  85 #define FG_OCV_CAP_VAL_MASK                     0x7F
  86 #define FG_CC_CAP_VALID                         (1 << 7)
  87 #define FG_CC_CAP_VAL_MASK                      0x7F
  88
  89 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  90 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  91 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  92 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  93 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  94 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  95
  96 #define STATUS_MON_DELAY_JIFFIES    (HZ * 60)   /*60 sec */
  97 #define NR_RETRY_CNT    3
  98 #define DEV_NAME        "axp288_fuel_gauge"
  99
 100 /* 1.1mV per LSB expressed in uV */
 101 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
 102 /* properties converted to uV, uA */
 103 #define PROP_VOLT(a)            ((a) * 1000)
 104 #define PROP_CURR(a)            ((a) * 1000)
 105
 106 #define AXP288_FG_INTR_NUM      6
 107 enum {
 108         QWBTU_IRQ = 0,
 109         WBTU_IRQ,
 110         QWBTO_IRQ,
 111         WBTO_IRQ,
 112         WL2_IRQ,
 113         WL1_IRQ,
 114 };
 115
 116 struct axp288_fg_info {
 117         struct platform_device *pdev;
 118         struct regmap *regmap;
 119         struct regmap_irq_chip_data *regmap_irqc;
 120         int irq[AXP288_FG_INTR_NUM];
 121         struct power_supply *bat;
 122         struct mutex lock;
 123         int status;
 124         int max_volt;
 125         struct delayed_work status_monitor;
 126         struct dentry *debug_file;
 127 };
 128
 129 static enum power_supply_property fuel_gauge_props[] = {
 130         POWER_SUPPLY_PROP_STATUS,
 131         POWER_SUPPLY_PROP_PRESENT,
 132         POWER_SUPPLY_PROP_HEALTH,
 133         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 134         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 135         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 136         POWER_SUPPLY_PROP_CURRENT_NOW,
 137         POWER_SUPPLY_PROP_CAPACITY,
 138         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 139         POWER_SUPPLY_PROP_TECHNOLOGY,
 140         POWER_SUPPLY_PROP_CHARGE_FULL,
 141         POWER_SUPPLY_PROP_CHARGE_NOW,
 142 };
 143
 144 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 145 {
 146         int ret, i;
 147         unsigned int val;
 148
 149         for (i = 0; i < NR_RETRY_CNT; i++) {
 150                 ret = regmap_read(info->regmap, reg, &val);
 151                 if (ret == -EBUSY)
 152                         continue;
 153                 else
 154                         break;
 155         }
 156
 157         if (ret < 0)
 158                 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
 159
 160         return val;
 161 }
 162
 163 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 164 {
 165         int ret;
 166
 167         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 168
 169         if (ret < 0)
 170                 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
 171
 172         return ret;
 173 }
 174
 175 static int pmic_read_adc_val(const char *name, int *raw_val,
 176                 struct axp288_fg_info *info)
 177 {
 178         int ret, val = 0;
 179         struct iio_channel *indio_chan;
 180
 181         indio_chan = iio_channel_get(NULL, name);
 182         if (IS_ERR_OR_NULL(indio_chan)) {
 183                 ret = PTR_ERR(indio_chan);
 184                 goto exit;
 185         }
 186         ret = iio_read_channel_raw(indio_chan, &val);
 187         if (ret < 0) {
 188                 dev_err(&info->pdev->dev,
 189                         "IIO channel read error: %x, %x\n", ret, val);
 190                 goto err_exit;
 191         }
 192
 193         dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
 194         *raw_val = val;
 195
 196 err_exit:
 197         iio_channel_release(indio_chan);
 198 exit:
 199         return ret;
 200 }
 201
 202 #ifdef CONFIG_DEBUG_FS
 203 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 204 {
 205         struct axp288_fg_info *info = s->private;
 206         int raw_val, ret;
 207
 208         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 209                 AXP20X_PWR_INPUT_STATUS,
 210                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 211         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 212                 AXP20X_PWR_OP_MODE,
 213                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 214         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 215                 AXP20X_CHRG_CTRL1,
 216                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 217         seq_printf(s, "       VLTF[%02x] : %02x\n",
 218                 AXP20X_V_LTF_DISCHRG,
 219                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 220         seq_printf(s, "       VHTF[%02x] : %02x\n",
 221                 AXP20X_V_HTF_DISCHRG,
 222                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 223         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 224                 AXP20X_CC_CTRL,
 225                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 226         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 227                 AXP20X_FG_RES,
 228                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 229         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 230                 AXP288_FG_RDC1_REG,
 231                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 232         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 233                 AXP288_FG_RDC0_REG,
 234                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 235         seq_printf(s, "    FG_OCVH[%02x] : %02x\n",
 236                 AXP288_FG_OCVH_REG,
 237                 fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
 238         seq_printf(s, "    FG_OCVL[%02x] : %02x\n",
 239                 AXP288_FG_OCVL_REG,
 240                 fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
 241         seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
 242                 AXP288_FG_DES_CAP1_REG,
 243                 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
 244         seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
 245                 AXP288_FG_DES_CAP0_REG,
 246                 fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
 247         seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
 248                 AXP288_FG_CC_MTR1_REG,
 249                 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
 250         seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
 251                 AXP288_FG_CC_MTR0_REG,
 252                 fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
 253         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 254                 AXP288_FG_OCV_CAP_REG,
 255                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 256         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 257                 AXP288_FG_CC_CAP_REG,
 258                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 259         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 260                 AXP288_FG_LOW_CAP_REG,
 261                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 262         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 263                 AXP288_FG_TUNE0,
 264                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 265         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 266                 AXP288_FG_TUNE1,
 267                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 268         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 269                 AXP288_FG_TUNE2,
 270                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 271         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 272                 AXP288_FG_TUNE3,
 273                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 274         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 275                 AXP288_FG_TUNE4,
 276                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 277         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 278                 AXP288_FG_TUNE5,
 279                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 280
 281         ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
 282         if (ret >= 0)
 283                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 284         ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
 285         if (ret >= 0)
 286                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 287         ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
 288         if (ret >= 0)
 289                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 290         ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
 291         if (ret >= 0)
 292                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 293         ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
 294         if (ret >= 0)
 295                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 296         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 297         if (ret >= 0)
 298                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 299
 300         return 0;
 301 }
 302
 303 static int debug_open(struct inode *inode, struct file *file)
 304 {
 305         return single_open(file, fuel_gauge_debug_show, inode->i_private);
 306 }
 307
 308 static const struct file_operations fg_debug_fops = {
 309         .open       = debug_open,
 310         .read       = seq_read,
 311         .llseek     = seq_lseek,
 312         .release    = single_release,
 313 };
 314
 315 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 316 {
 317         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 318                 info, &fg_debug_fops);
 319 }
 320
 321 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 322 {
 323         debugfs_remove(info->debug_file);
 324 }
 325 #else
 326 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 327 {
 328 }
 329 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 330 {
 331 }
 332 #endif
 333
 334 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 335 {
 336         int pwr_stat, ret;
 337         int charge, discharge;
 338
 339         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 340         if (pwr_stat < 0) {
 341                 dev_err(&info->pdev->dev,
 342                         "PWR STAT read failed:%d\n", pwr_stat);
 343                 return;
 344         }
 345         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 346         if (ret < 0) {
 347                 dev_err(&info->pdev->dev,
 348                         "ADC charge current read failed:%d\n", ret);
 349                 return;
 350         }
 351         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 352         if (ret < 0) {
 353                 dev_err(&info->pdev->dev,
 354                         "ADC discharge current read failed:%d\n", ret);
 355                 return;
 356         }
 357
 358         if (charge > 0)
 359                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 360         else if (discharge > 0)
 361                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 362         else {
 363                 if (pwr_stat & CHRG_STAT_BAT_PRESENT)
 364                         info->status = POWER_SUPPLY_STATUS_FULL;
 365                 else
 366                         info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 367         }
 368 }
 369
 370 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 371 {
 372         int ret = 0, raw_val;
 373
 374         ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
 375         if (ret < 0)
 376                 goto vbatt_read_fail;
 377
 378         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 379 vbatt_read_fail:
 380         return ret;
 381 }
 382
 383 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 384 {
 385         int ret, value = 0;
 386         int charge, discharge;
 387
 388         ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
 389         if (ret < 0)
 390                 goto current_read_fail;
 391         ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
 392         if (ret < 0)
 393                 goto current_read_fail;
 394
 395         if (charge > 0)
 396                 value = charge;
 397         else if (discharge > 0)
 398                 value = -1 * discharge;
 399
 400         *cur = value;
 401 current_read_fail:
 402         return ret;
 403 }
 404
 405 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 406 {
 407         int ret, value;
 408
 409         /* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
 410         ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
 411         if (ret < 0)
 412                 goto vocv_read_fail;
 413         value = ret << 4;
 414
 415         ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
 416         if (ret < 0)
 417                 goto vocv_read_fail;
 418         value |= (ret & 0xf);
 419
 420         *vocv = VOLTAGE_FROM_ADC(value);
 421 vocv_read_fail:
 422         return ret;
 423 }
 424
 425 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 426 {
 427         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 428
 429         ret = fuel_gauge_get_vocv(info, &vocv);
 430         if (ret < 0)
 431                 goto health_read_fail;
 432
 433         if (vocv > info->max_volt)
 434                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 435         else
 436                 health = POWER_SUPPLY_HEALTH_GOOD;
 437
 438 health_read_fail:
 439         return health;
 440 }
 441
 442 static int fuel_gauge_get_property(struct power_supply *ps,
 443                 enum power_supply_property prop,
 444                 union power_supply_propval *val)
 445 {
 446         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 447         int ret = 0, value;
 448
 449         mutex_lock(&info->lock);
 450         switch (prop) {
 451         case POWER_SUPPLY_PROP_STATUS:
 452                 fuel_gauge_get_status(info);
 453                 val->intval = info->status;
 454                 break;
 455         case POWER_SUPPLY_PROP_HEALTH:
 456                 val->intval = fuel_gauge_battery_health(info);
 457                 break;
 458         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 459                 ret = fuel_gauge_get_vbatt(info, &value);
 460                 if (ret < 0)
 461                         goto fuel_gauge_read_err;
 462                 val->intval = PROP_VOLT(value);
 463                 break;
 464         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 465                 ret = fuel_gauge_get_vocv(info, &value);
 466                 if (ret < 0)
 467                         goto fuel_gauge_read_err;
 468                 val->intval = PROP_VOLT(value);
 469                 break;
 470         case POWER_SUPPLY_PROP_CURRENT_NOW:
 471                 ret = fuel_gauge_get_current(info, &value);
 472                 if (ret < 0)
 473                         goto fuel_gauge_read_err;
 474                 val->intval = PROP_CURR(value);
 475                 break;
 476         case POWER_SUPPLY_PROP_PRESENT:
 477                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 478                 if (ret < 0)
 479                         goto fuel_gauge_read_err;
 480
 481                 if (ret & CHRG_STAT_BAT_PRESENT)
 482                         val->intval = 1;
 483                 else
 484                         val->intval = 0;
 485                 break;
 486         case POWER_SUPPLY_PROP_CAPACITY:
 487                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 488                 if (ret < 0)
 489                         goto fuel_gauge_read_err;
 490
 491                 if (!(ret & FG_REP_CAP_VALID))
 492                         dev_err(&info->pdev->dev,
 493                                 "capacity measurement not valid\n");
 494                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 495                 break;
 496         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 497                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 498                 if (ret < 0)
 499                         goto fuel_gauge_read_err;
 500                 val->intval = (ret & 0x0f);
 501                 break;
 502         case POWER_SUPPLY_PROP_TECHNOLOGY:
 503                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 504                 break;
 505         case POWER_SUPPLY_PROP_CHARGE_NOW:
 506                 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
 507                 if (ret < 0)
 508                         goto fuel_gauge_read_err;
 509
 510                 value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
 511                 ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
 512                 if (ret < 0)
 513                         goto fuel_gauge_read_err;
 514                 value |= (ret & FG_CC_MTR0_VAL_MASK);
 515                 val->intval = value * FG_DES_CAP_RES_LSB;
 516                 break;
 517         case POWER_SUPPLY_PROP_CHARGE_FULL:
 518                 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 519                 if (ret < 0)
 520                         goto fuel_gauge_read_err;
 521
 522                 value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
 523                 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
 524                 if (ret < 0)
 525                         goto fuel_gauge_read_err;
 526                 value |= (ret & FG_DES_CAP0_VAL_MASK);
 527                 val->intval = value * FG_DES_CAP_RES_LSB;
 528                 break;
 529         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 530                 val->intval = PROP_VOLT(info->max_volt);
 531                 break;
 532         default:
 533                 mutex_unlock(&info->lock);
 534                 return -EINVAL;
 535         }
 536
 537         mutex_unlock(&info->lock);
 538         return 0;
 539
 540 fuel_gauge_read_err:
 541         mutex_unlock(&info->lock);
 542         return ret;
 543 }
 544
 545 static int fuel_gauge_set_property(struct power_supply *ps,
 546                 enum power_supply_property prop,
 547                 const union power_supply_propval *val)
 548 {
 549         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 550         int ret = 0;
 551
 552         mutex_lock(&info->lock);
 553         switch (prop) {
 554         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 555                 if ((val->intval < 0) || (val->intval > 15)) {
 556                         ret = -EINVAL;
 557                         break;
 558                 }
 559                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 560                 if (ret < 0)
 561                         break;
 562                 ret &= 0xf0;
 563                 ret |= (val->intval & 0xf);
 564                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 565                 break;
 566         default:
 567                 ret = -EINVAL;
 568                 break;
 569         }
 570
 571         mutex_unlock(&info->lock);
 572         return ret;
 573 }
 574
 575 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 576         enum power_supply_property psp)
 577 {
 578         int ret;
 579
 580         switch (psp) {
 581         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 582                 ret = 1;
 583                 break;
 584         default:
 585                 ret = 0;
 586         }
 587
 588         return ret;
 589 }
 590
 591 static void fuel_gauge_status_monitor(struct work_struct *work)
 592 {
 593         struct axp288_fg_info *info = container_of(work,
 594                 struct axp288_fg_info, status_monitor.work);
 595
 596         fuel_gauge_get_status(info);
 597         power_supply_changed(info->bat);
 598         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 599 }
 600
 601 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 602 {
 603         struct axp288_fg_info *info = dev;
 604         int i;
 605
 606         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 607                 if (info->irq[i] == irq)
 608                         break;
 609         }
 610
 611         if (i >= AXP288_FG_INTR_NUM) {
 612                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 613                 return IRQ_NONE;
 614         }
 615
 616         switch (i) {
 617         case QWBTU_IRQ:
 618                 dev_info(&info->pdev->dev,
 619                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 620                 break;
 621         case WBTU_IRQ:
 622                 dev_info(&info->pdev->dev,
 623                         "Battery under temperature in work mode IRQ (WBTU)\n");
 624                 break;
 625         case QWBTO_IRQ:
 626                 dev_info(&info->pdev->dev,
 627                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 628                 break;
 629         case WBTO_IRQ:
 630                 dev_info(&info->pdev->dev,
 631                         "Battery over temperature in work mode IRQ (WBTO)\n");
 632                 break;
 633         case WL2_IRQ:
 634                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 635                 break;
 636         case WL1_IRQ:
 637                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 638                 break;
 639         default:
 640                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 641         }
 642
 643         power_supply_changed(info->bat);
 644         return IRQ_HANDLED;
 645 }
 646
 647 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 648 {
 649         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 650
 651         power_supply_changed(info->bat);
 652 }
 653
 654 static const struct power_supply_desc fuel_gauge_desc = {
 655         .name                   = DEV_NAME,
 656         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 657         .properties             = fuel_gauge_props,
 658         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 659         .get_property           = fuel_gauge_get_property,
 660         .set_property           = fuel_gauge_set_property,
 661         .property_is_writeable  = fuel_gauge_property_is_writeable,
 662         .external_power_changed = fuel_gauge_external_power_changed,
 663 };
 664
 665 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
 666 {
 667         int ret, i, pirq;
 668
 669         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 670                 pirq = platform_get_irq(info->pdev, i);
 671                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 672                 if (info->irq[i] < 0) {
 673                         dev_warn(&info->pdev->dev,
 674                                 "regmap_irq get virq failed for IRQ %d: %d\n",
 675                                 pirq, info->irq[i]);
 676                         info->irq[i] = -1;
 677                         goto intr_failed;
 678                 }
 679                 ret = request_threaded_irq(info->irq[i],
 680                                 NULL, fuel_gauge_thread_handler,
 681                                 IRQF_ONESHOT, DEV_NAME, info);
 682                 if (ret) {
 683                         dev_warn(&info->pdev->dev,
 684                                 "request irq failed for IRQ %d: %d\n",
 685                                 pirq, info->irq[i]);
 686                         info->irq[i] = -1;
 687                         goto intr_failed;
 688                 } else {
 689                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
 690                                 pirq, info->irq[i]);
 691                 }
 692         }
 693         return;
 694
 695 intr_failed:
 696         for (; i > 0; i--) {
 697                 free_irq(info->irq[i - 1], info);
 698                 info->irq[i - 1] = -1;
 699         }
 700 }
 701
 702 static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
 703 {
 704         unsigned int val;
 705
 706         /* enable interrupts */
 707         val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
 708         val |= TEMP_IRQ_CFG_MASK;
 709         fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
 710
 711         val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
 712         val |= FG_IRQ_CFG_LOWBATT_MASK;
 713         val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
 714 }
 715
 716 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 717 {
 718         int ret = 0;
 719         struct axp288_fg_info *info;
 720         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 721         struct power_supply_config psy_cfg = {};
 722
 723         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 724         if (!info)
 725                 return -ENOMEM;
 726
 727         info->pdev = pdev;
 728         info->regmap = axp20x->regmap;
 729         info->regmap_irqc = axp20x->regmap_irqc;
 730         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 731
 732         platform_set_drvdata(pdev, info);
 733
 734         mutex_init(&info->lock);
 735         INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
 736
 737         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 738         if (ret < 0)
 739                 return ret;
 740
 741         if (!(ret & FG_DES_CAP1_VALID)) {
 742                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 743                 return -ENODEV;
 744         }
 745
 746         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 747         if (ret < 0)
 748                 return ret;
 749         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 750         case CHRG_CCCV_CV_4100MV:
 751                 info->max_volt = 4100;
 752                 break;
 753         case CHRG_CCCV_CV_4150MV:
 754                 info->max_volt = 4150;
 755                 break;
 756         case CHRG_CCCV_CV_4200MV:
 757                 info->max_volt = 4200;
 758                 break;
 759         case CHRG_CCCV_CV_4350MV:
 760                 info->max_volt = 4350;
 761                 break;
 762         }
 763
 764         psy_cfg.drv_data = info;
 765         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 766         if (IS_ERR(info->bat)) {
 767                 ret = PTR_ERR(info->bat);
 768                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 769                 return ret;
 770         }
 771
 772         fuel_gauge_create_debugfs(info);
 773         fuel_gauge_init_irq(info);
 774         fuel_gauge_init_hw_regs(info);
 775         schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
 776
 777         return 0;
 778 }
 779
 780 static const struct platform_device_id axp288_fg_id_table[] = {
 781         { .name = DEV_NAME },
 782         {},
 783 };
 784 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 785
 786 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 787 {
 788         struct axp288_fg_info *info = platform_get_drvdata(pdev);
 789         int i;
 790
 791         cancel_delayed_work_sync(&info->status_monitor);
 792         power_supply_unregister(info->bat);
 793         fuel_gauge_remove_debugfs(info);
 794
 795         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 796                 if (info->irq[i] >= 0)
 797                         free_irq(info->irq[i], info);
 798
 799         return 0;
 800 }
 801
 802 static struct platform_driver axp288_fuel_gauge_driver = {
 803         .probe = axp288_fuel_gauge_probe,
 804         .remove = axp288_fuel_gauge_remove,
 805         .id_table = axp288_fg_id_table,
 806         .driver = {
 807                 .name = DEV_NAME,
 808         },
 809 };
 810
 811 module_platform_driver(axp288_fuel_gauge_driver);
 812
 813 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 814 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 815 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 816 MODULE_LICENSE("GPL");