drivers/power/supply/axp288_fuel_gauge.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
   4  *
   5  * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
   6  * Copyright (C) 2014 Intel Corporation
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  */
  10
  11 #include <linux/dmi.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/mfd/axp20x.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/iio/consumer.h>
  22 #include <linux/debugfs.h>
  23 #include <linux/seq_file.h>
  24 #include <asm/unaligned.h>
  25
  26 #define PS_STAT_VBUS_TRIGGER            (1 << 0)
  27 #define PS_STAT_BAT_CHRG_DIR            (1 << 2)
  28 #define PS_STAT_VBAT_ABOVE_VHOLD        (1 << 3)
  29 #define PS_STAT_VBUS_VALID              (1 << 4)
  30 #define PS_STAT_VBUS_PRESENT            (1 << 5)
  31
  32 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  33 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  34 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  35 #define CHRG_STAT_CHARGING                      (1 << 6)
  36 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  37
  38 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  39 #define CHRG_CCCV_CC_BIT_POS            0
  40 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  41 #define CHRG_CCCV_CC_LSB_RES            200     /* 200mA */
  42 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  43 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  44 #define CHRG_CCCV_CV_BIT_POS            5
  45 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  46 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  47 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  48 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  49 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  50
  51 #define FG_CNTL_OCV_ADJ_STAT            (1 << 2)
  52 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  53 #define FG_CNTL_CAP_ADJ_STAT            (1 << 4)
  54 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  55 #define FG_CNTL_CC_EN                           (1 << 6)
  56 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  57
  58 #define FG_15BIT_WORD_VALID                     (1 << 15)
  59 #define FG_15BIT_VAL_MASK                       0x7fff
  60
  61 #define FG_REP_CAP_VALID                        (1 << 7)
  62 #define FG_REP_CAP_VAL_MASK                     0x7F
  63
  64 #define FG_DES_CAP1_VALID                       (1 << 7)
  65 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  66
  67 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  68
  69 #define FG_OCV_CAP_VALID                        (1 << 7)
  70 #define FG_OCV_CAP_VAL_MASK                     0x7F
  71 #define FG_CC_CAP_VALID                         (1 << 7)
  72 #define FG_CC_CAP_VAL_MASK                      0x7F
  73
  74 #define FG_LOW_CAP_THR1_MASK            0xf0    /* 5% tp 20% */
  75 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  76 #define FG_LOW_CAP_THR2_MASK            0x0f    /* 0% to 15% */
  77 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  78 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  79 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  80
  81 #define NR_RETRY_CNT    3
  82 #define DEV_NAME        "axp288_fuel_gauge"
  83
  84 /* 1.1mV per LSB expressed in uV */
  85 #define VOLTAGE_FROM_ADC(a)                     ((a * 11) / 10)
  86 /* properties converted to uV, uA */
  87 #define PROP_VOLT(a)            ((a) * 1000)
  88 #define PROP_CURR(a)            ((a) * 1000)
  89
  90 #define AXP288_FG_INTR_NUM      6
  91 enum {
  92         QWBTU_IRQ = 0,
  93         WBTU_IRQ,
  94         QWBTO_IRQ,
  95         WBTO_IRQ,
  96         WL2_IRQ,
  97         WL1_IRQ,
  98 };
  99
 100 enum {
 101         BAT_TEMP = 0,
 102         PMIC_TEMP,
 103         SYSTEM_TEMP,
 104         BAT_CHRG_CURR,
 105         BAT_D_CURR,
 106         BAT_VOLT,
 107         IIO_CHANNEL_NUM
 108 };
 109
 110 struct axp288_fg_info {
 111         struct platform_device *pdev;
 112         struct regmap *regmap;
 113         struct regmap_irq_chip_data *regmap_irqc;
 114         int irq[AXP288_FG_INTR_NUM];
 115         struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
 116         struct power_supply *bat;
 117         struct mutex lock;
 118         int status;
 119         int max_volt;
 120         struct dentry *debug_file;
 121 };
 122
 123 static enum power_supply_property fuel_gauge_props[] = {
 124         POWER_SUPPLY_PROP_STATUS,
 125         POWER_SUPPLY_PROP_PRESENT,
 126         POWER_SUPPLY_PROP_HEALTH,
 127         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 128         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 129         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 130         POWER_SUPPLY_PROP_CURRENT_NOW,
 131         POWER_SUPPLY_PROP_CAPACITY,
 132         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 133         POWER_SUPPLY_PROP_TECHNOLOGY,
 134         POWER_SUPPLY_PROP_CHARGE_FULL,
 135         POWER_SUPPLY_PROP_CHARGE_NOW,
 136 };
 137
 138 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 139 {
 140         int ret, i;
 141         unsigned int val;
 142
 143         for (i = 0; i < NR_RETRY_CNT; i++) {
 144                 ret = regmap_read(info->regmap, reg, &val);
 145                 if (ret == -EBUSY)
 146                         continue;
 147                 else
 148                         break;
 149         }
 150
 151         if (ret < 0) {
 152                 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
 153                 return ret;
 154         }
 155
 156         return val;
 157 }
 158
 159 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 160 {
 161         int ret;
 162
 163         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 164
 165         if (ret < 0)
 166                 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
 167
 168         return ret;
 169 }
 170
 171 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 172 {
 173         unsigned char buf[2];
 174         int ret;
 175
 176         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 177         if (ret < 0) {
 178                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 179                         reg, ret);
 180                 return ret;
 181         }
 182
 183         ret = get_unaligned_be16(buf);
 184         if (!(ret & FG_15BIT_WORD_VALID)) {
 185                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
 186                         reg);
 187                 return -ENXIO;
 188         }
 189
 190         return ret & FG_15BIT_VAL_MASK;
 191 }
 192
 193 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 194 {
 195         unsigned char buf[2];
 196         int ret;
 197
 198         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 199         if (ret < 0) {
 200                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 201                         reg, ret);
 202                 return ret;
 203         }
 204
 205         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 206         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 207 }
 208
 209 #ifdef CONFIG_DEBUG_FS
 210 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 211 {
 212         struct axp288_fg_info *info = s->private;
 213         int raw_val, ret;
 214
 215         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 216                 AXP20X_PWR_INPUT_STATUS,
 217                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 218         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 219                 AXP20X_PWR_OP_MODE,
 220                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 221         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 222                 AXP20X_CHRG_CTRL1,
 223                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 224         seq_printf(s, "       VLTF[%02x] : %02x\n",
 225                 AXP20X_V_LTF_DISCHRG,
 226                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 227         seq_printf(s, "       VHTF[%02x] : %02x\n",
 228                 AXP20X_V_HTF_DISCHRG,
 229                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 230         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 231                 AXP20X_CC_CTRL,
 232                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 233         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 234                 AXP20X_FG_RES,
 235                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 236         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 237                 AXP288_FG_RDC1_REG,
 238                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 239         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 240                 AXP288_FG_RDC0_REG,
 241                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 242         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
 243                 AXP288_FG_OCVH_REG,
 244                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
 245         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
 246                 AXP288_FG_DES_CAP1_REG,
 247                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
 248         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
 249                 AXP288_FG_CC_MTR1_REG,
 250                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
 251         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 252                 AXP288_FG_OCV_CAP_REG,
 253                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 254         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 255                 AXP288_FG_CC_CAP_REG,
 256                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 257         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 258                 AXP288_FG_LOW_CAP_REG,
 259                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 260         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 261                 AXP288_FG_TUNE0,
 262                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 263         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 264                 AXP288_FG_TUNE1,
 265                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 266         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 267                 AXP288_FG_TUNE2,
 268                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 269         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 270                 AXP288_FG_TUNE3,
 271                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 272         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 273                 AXP288_FG_TUNE4,
 274                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 275         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 276                 AXP288_FG_TUNE5,
 277                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 278
 279         ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val);
 280         if (ret >= 0)
 281                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 282         ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val);
 283         if (ret >= 0)
 284                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 285         ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val);
 286         if (ret >= 0)
 287                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 288         ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val);
 289         if (ret >= 0)
 290                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 291         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val);
 292         if (ret >= 0)
 293                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 294         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 295         if (ret >= 0)
 296                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 297
 298         return 0;
 299 }
 300
 301 DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug);
 302
 303 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 304 {
 305         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 306                 info, &fuel_gauge_debug_fops);
 307 }
 308
 309 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 310 {
 311         debugfs_remove(info->debug_file);
 312 }
 313 #else
 314 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 315 {
 316 }
 317 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 318 {
 319 }
 320 #endif
 321
 322 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 323 {
 324         int pwr_stat, fg_res, curr, ret;
 325
 326         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 327         if (pwr_stat < 0) {
 328                 dev_err(&info->pdev->dev,
 329                         "PWR STAT read failed:%d\n", pwr_stat);
 330                 return;
 331         }
 332
 333         /* Report full if Vbus is valid and the reported capacity is 100% */
 334         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 335                 goto not_full;
 336
 337         fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 338         if (fg_res < 0) {
 339                 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res);
 340                 return;
 341         }
 342         if (!(fg_res & FG_REP_CAP_VALID))
 343                 goto not_full;
 344
 345         fg_res &= ~FG_REP_CAP_VALID;
 346         if (fg_res == 100) {
 347                 info->status = POWER_SUPPLY_STATUS_FULL;
 348                 return;
 349         }
 350
 351         /*
 352          * Sometimes the charger turns itself off before fg-res reaches 100%.
 353          * When this happens the AXP288 reports a not-charging status and
 354          * 0 mA discharge current.
 355          */
 356         if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR))
 357                 goto not_full;
 358
 359         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr);
 360         if (ret < 0) {
 361                 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret);
 362                 return;
 363         }
 364         if (curr == 0) {
 365                 info->status = POWER_SUPPLY_STATUS_FULL;
 366                 return;
 367         }
 368
 369 not_full:
 370         if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
 371                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 372         else
 373                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 374 }
 375
 376 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 377 {
 378         int ret = 0, raw_val;
 379
 380         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 381         if (ret < 0)
 382                 goto vbatt_read_fail;
 383
 384         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 385 vbatt_read_fail:
 386         return ret;
 387 }
 388
 389 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 390 {
 391         int ret, discharge;
 392
 393         /* First check discharge current, so that we do only 1 read on bat. */
 394         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
 395         if (ret < 0)
 396                 return ret;
 397
 398         if (discharge > 0) {
 399                 *cur = -1 * discharge;
 400                 return 0;
 401         }
 402
 403         return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
 404 }
 405
 406 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 407 {
 408         int ret;
 409
 410         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 411         if (ret >= 0)
 412                 *vocv = VOLTAGE_FROM_ADC(ret);
 413
 414         return ret;
 415 }
 416
 417 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 418 {
 419         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 420
 421         ret = fuel_gauge_get_vocv(info, &vocv);
 422         if (ret < 0)
 423                 goto health_read_fail;
 424
 425         if (vocv > info->max_volt)
 426                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 427         else
 428                 health = POWER_SUPPLY_HEALTH_GOOD;
 429
 430 health_read_fail:
 431         return health;
 432 }
 433
 434 static int fuel_gauge_get_property(struct power_supply *ps,
 435                 enum power_supply_property prop,
 436                 union power_supply_propval *val)
 437 {
 438         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 439         int ret = 0, value;
 440
 441         mutex_lock(&info->lock);
 442         switch (prop) {
 443         case POWER_SUPPLY_PROP_STATUS:
 444                 fuel_gauge_get_status(info);
 445                 val->intval = info->status;
 446                 break;
 447         case POWER_SUPPLY_PROP_HEALTH:
 448                 val->intval = fuel_gauge_battery_health(info);
 449                 break;
 450         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 451                 ret = fuel_gauge_get_vbatt(info, &value);
 452                 if (ret < 0)
 453                         goto fuel_gauge_read_err;
 454                 val->intval = PROP_VOLT(value);
 455                 break;
 456         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 457                 ret = fuel_gauge_get_vocv(info, &value);
 458                 if (ret < 0)
 459                         goto fuel_gauge_read_err;
 460                 val->intval = PROP_VOLT(value);
 461                 break;
 462         case POWER_SUPPLY_PROP_CURRENT_NOW:
 463                 ret = fuel_gauge_get_current(info, &value);
 464                 if (ret < 0)
 465                         goto fuel_gauge_read_err;
 466                 val->intval = PROP_CURR(value);
 467                 break;
 468         case POWER_SUPPLY_PROP_PRESENT:
 469                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 470                 if (ret < 0)
 471                         goto fuel_gauge_read_err;
 472
 473                 if (ret & CHRG_STAT_BAT_PRESENT)
 474                         val->intval = 1;
 475                 else
 476                         val->intval = 0;
 477                 break;
 478         case POWER_SUPPLY_PROP_CAPACITY:
 479                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 480                 if (ret < 0)
 481                         goto fuel_gauge_read_err;
 482
 483                 if (!(ret & FG_REP_CAP_VALID))
 484                         dev_err(&info->pdev->dev,
 485                                 "capacity measurement not valid\n");
 486                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 487                 break;
 488         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 489                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 490                 if (ret < 0)
 491                         goto fuel_gauge_read_err;
 492                 val->intval = (ret & 0x0f);
 493                 break;
 494         case POWER_SUPPLY_PROP_TECHNOLOGY:
 495                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 496                 break;
 497         case POWER_SUPPLY_PROP_CHARGE_NOW:
 498                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 499                 if (ret < 0)
 500                         goto fuel_gauge_read_err;
 501
 502                 val->intval = ret * FG_DES_CAP_RES_LSB;
 503                 break;
 504         case POWER_SUPPLY_PROP_CHARGE_FULL:
 505                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 506                 if (ret < 0)
 507                         goto fuel_gauge_read_err;
 508
 509                 val->intval = ret * FG_DES_CAP_RES_LSB;
 510                 break;
 511         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 512                 val->intval = PROP_VOLT(info->max_volt);
 513                 break;
 514         default:
 515                 mutex_unlock(&info->lock);
 516                 return -EINVAL;
 517         }
 518
 519         mutex_unlock(&info->lock);
 520         return 0;
 521
 522 fuel_gauge_read_err:
 523         mutex_unlock(&info->lock);
 524         return ret;
 525 }
 526
 527 static int fuel_gauge_set_property(struct power_supply *ps,
 528                 enum power_supply_property prop,
 529                 const union power_supply_propval *val)
 530 {
 531         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 532         int ret = 0;
 533
 534         mutex_lock(&info->lock);
 535         switch (prop) {
 536         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 537                 if ((val->intval < 0) || (val->intval > 15)) {
 538                         ret = -EINVAL;
 539                         break;
 540                 }
 541                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 542                 if (ret < 0)
 543                         break;
 544                 ret &= 0xf0;
 545                 ret |= (val->intval & 0xf);
 546                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 547                 break;
 548         default:
 549                 ret = -EINVAL;
 550                 break;
 551         }
 552
 553         mutex_unlock(&info->lock);
 554         return ret;
 555 }
 556
 557 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 558         enum power_supply_property psp)
 559 {
 560         int ret;
 561
 562         switch (psp) {
 563         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 564                 ret = 1;
 565                 break;
 566         default:
 567                 ret = 0;
 568         }
 569
 570         return ret;
 571 }
 572
 573 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 574 {
 575         struct axp288_fg_info *info = dev;
 576         int i;
 577
 578         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 579                 if (info->irq[i] == irq)
 580                         break;
 581         }
 582
 583         if (i >= AXP288_FG_INTR_NUM) {
 584                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 585                 return IRQ_NONE;
 586         }
 587
 588         switch (i) {
 589         case QWBTU_IRQ:
 590                 dev_info(&info->pdev->dev,
 591                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 592                 break;
 593         case WBTU_IRQ:
 594                 dev_info(&info->pdev->dev,
 595                         "Battery under temperature in work mode IRQ (WBTU)\n");
 596                 break;
 597         case QWBTO_IRQ:
 598                 dev_info(&info->pdev->dev,
 599                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 600                 break;
 601         case WBTO_IRQ:
 602                 dev_info(&info->pdev->dev,
 603                         "Battery over temperature in work mode IRQ (WBTO)\n");
 604                 break;
 605         case WL2_IRQ:
 606                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 607                 break;
 608         case WL1_IRQ:
 609                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 610                 break;
 611         default:
 612                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 613         }
 614
 615         power_supply_changed(info->bat);
 616         return IRQ_HANDLED;
 617 }
 618
 619 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 620 {
 621         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 622
 623         power_supply_changed(info->bat);
 624 }
 625
 626 static const struct power_supply_desc fuel_gauge_desc = {
 627         .name                   = DEV_NAME,
 628         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 629         .properties             = fuel_gauge_props,
 630         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 631         .get_property           = fuel_gauge_get_property,
 632         .set_property           = fuel_gauge_set_property,
 633         .property_is_writeable  = fuel_gauge_property_is_writeable,
 634         .external_power_changed = fuel_gauge_external_power_changed,
 635 };
 636
 637 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
 638 {
 639         int ret, i, pirq;
 640
 641         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 642                 pirq = platform_get_irq(info->pdev, i);
 643                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 644                 if (info->irq[i] < 0) {
 645                         dev_warn(&info->pdev->dev,
 646                                 "regmap_irq get virq failed for IRQ %d: %d\n",
 647                                 pirq, info->irq[i]);
 648                         info->irq[i] = -1;
 649                         goto intr_failed;
 650                 }
 651                 ret = request_threaded_irq(info->irq[i],
 652                                 NULL, fuel_gauge_thread_handler,
 653                                 IRQF_ONESHOT, DEV_NAME, info);
 654                 if (ret) {
 655                         dev_warn(&info->pdev->dev,
 656                                 "request irq failed for IRQ %d: %d\n",
 657                                 pirq, info->irq[i]);
 658                         info->irq[i] = -1;
 659                         goto intr_failed;
 660                 } else {
 661                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
 662                                 pirq, info->irq[i]);
 663                 }
 664         }
 665         return;
 666
 667 intr_failed:
 668         for (; i > 0; i--) {
 669                 free_irq(info->irq[i - 1], info);
 670                 info->irq[i - 1] = -1;
 671         }
 672 }
 673
 674 /*
 675  * Some devices have no battery (HDMI sticks) and the axp288 battery's
 676  * detection reports one despite it not being there.
 677  * Please keep this listed sorted alphabetically.
 678  */
 679 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
 680         {
 681                 /* ACEPC T8 Cherry Trail Z8350 mini PC */
 682                 .matches = {
 683                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 684                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 685                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
 686                         /* also match on somewhat unique bios-version */
 687                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 688                 },
 689         },
 690         {
 691                 /* ACEPC T11 Cherry Trail Z8350 mini PC */
 692                 .matches = {
 693                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 694                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 695                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
 696                         /* also match on somewhat unique bios-version */
 697                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 698                 },
 699         },
 700         {
 701                 /* ECS EF20EA */
 702                 .matches = {
 703                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 704                 },
 705         },
 706         {
 707                 /* Intel Cherry Trail Compute Stick, Windows version */
 708                 .matches = {
 709                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 710                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
 711                 },
 712         },
 713         {
 714                 /* Intel Cherry Trail Compute Stick, version without an OS */
 715                 .matches = {
 716                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 717                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
 718                 },
 719         },
 720         {
 721                 /* Meegopad T02 */
 722                 .matches = {
 723                         DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"),
 724                 },
 725         },
 726         {
 727                 /* Meegopad T08 */
 728                 .matches = {
 729                         DMI_MATCH(DMI_SYS_VENDOR, "Default string"),
 730                         DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."),
 731                         DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 732                         DMI_MATCH(DMI_BOARD_VERSION, "V1.1"),
 733                 },
 734         },
 735         {
 736                 /* Minix Neo Z83-4 mini PC */
 737                 .matches = {
 738                         DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
 739                         DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
 740                 }
 741         },
 742         {}
 743 };
 744
 745 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 746 {
 747         int i, ret = 0;
 748         struct axp288_fg_info *info;
 749         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 750         struct power_supply_config psy_cfg = {};
 751         static const char * const iio_chan_name[] = {
 752                 [BAT_TEMP] = "axp288-batt-temp",
 753                 [PMIC_TEMP] = "axp288-pmic-temp",
 754                 [SYSTEM_TEMP] = "axp288-system-temp",
 755                 [BAT_CHRG_CURR] = "axp288-chrg-curr",
 756                 [BAT_D_CURR] = "axp288-chrg-d-curr",
 757                 [BAT_VOLT] = "axp288-batt-volt",
 758         };
 759         unsigned int val;
 760
 761         if (dmi_check_system(axp288_fuel_gauge_blacklist))
 762                 return -ENODEV;
 763
 764         /*
 765          * On some devices the fuelgauge and charger parts of the axp288 are
 766          * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
 767          */
 768         ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
 769         if (ret < 0)
 770                 return ret;
 771         if (val == 0)
 772                 return -ENODEV;
 773
 774         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 775         if (!info)
 776                 return -ENOMEM;
 777
 778         info->pdev = pdev;
 779         info->regmap = axp20x->regmap;
 780         info->regmap_irqc = axp20x->regmap_irqc;
 781         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 782
 783         platform_set_drvdata(pdev, info);
 784
 785         mutex_init(&info->lock);
 786
 787         for (i = 0; i < IIO_CHANNEL_NUM; i++) {
 788                 /*
 789                  * Note cannot use devm_iio_channel_get because x86 systems
 790                  * lack the device<->channel maps which iio_channel_get will
 791                  * try to use when passed a non NULL device pointer.
 792                  */
 793                 info->iio_channel[i] =
 794                         iio_channel_get(NULL, iio_chan_name[i]);
 795                 if (IS_ERR(info->iio_channel[i])) {
 796                         ret = PTR_ERR(info->iio_channel[i]);
 797                         dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
 798                                 iio_chan_name[i], ret);
 799                         /* Wait for axp288_adc to load */
 800                         if (ret == -ENODEV)
 801                                 ret = -EPROBE_DEFER;
 802
 803                         goto out_free_iio_chan;
 804                 }
 805         }
 806
 807         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 808         if (ret < 0)
 809                 goto out_free_iio_chan;
 810
 811         if (!(ret & FG_DES_CAP1_VALID)) {
 812                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 813                 ret = -ENODEV;
 814                 goto out_free_iio_chan;
 815         }
 816
 817         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 818         if (ret < 0)
 819                 goto out_free_iio_chan;
 820         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 821         case CHRG_CCCV_CV_4100MV:
 822                 info->max_volt = 4100;
 823                 break;
 824         case CHRG_CCCV_CV_4150MV:
 825                 info->max_volt = 4150;
 826                 break;
 827         case CHRG_CCCV_CV_4200MV:
 828                 info->max_volt = 4200;
 829                 break;
 830         case CHRG_CCCV_CV_4350MV:
 831                 info->max_volt = 4350;
 832                 break;
 833         }
 834
 835         psy_cfg.drv_data = info;
 836         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 837         if (IS_ERR(info->bat)) {
 838                 ret = PTR_ERR(info->bat);
 839                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 840                 goto out_free_iio_chan;
 841         }
 842
 843         fuel_gauge_create_debugfs(info);
 844         fuel_gauge_init_irq(info);
 845
 846         return 0;
 847
 848 out_free_iio_chan:
 849         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 850                 if (!IS_ERR_OR_NULL(info->iio_channel[i]))
 851                         iio_channel_release(info->iio_channel[i]);
 852
 853         return ret;
 854 }
 855
 856 static const struct platform_device_id axp288_fg_id_table[] = {
 857         { .name = DEV_NAME },
 858         {},
 859 };
 860 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 861
 862 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 863 {
 864         struct axp288_fg_info *info = platform_get_drvdata(pdev);
 865         int i;
 866
 867         power_supply_unregister(info->bat);
 868         fuel_gauge_remove_debugfs(info);
 869
 870         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 871                 if (info->irq[i] >= 0)
 872                         free_irq(info->irq[i], info);
 873
 874         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 875                 iio_channel_release(info->iio_channel[i]);
 876
 877         return 0;
 878 }
 879
 880 static struct platform_driver axp288_fuel_gauge_driver = {
 881         .probe = axp288_fuel_gauge_probe,
 882         .remove = axp288_fuel_gauge_remove,
 883         .id_table = axp288_fg_id_table,
 884         .driver = {
 885                 .name = DEV_NAME,
 886         },
 887 };
 888
 889 module_platform_driver(axp288_fuel_gauge_driver);
 890
 891 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 892 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 893 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 894 MODULE_LICENSE("GPL");