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                         break;
 147         }
 148
 149         if (ret < 0) {
 150                 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
 151                 return ret;
 152         }
 153
 154         return val;
 155 }
 156
 157 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 158 {
 159         int ret;
 160
 161         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 162
 163         if (ret < 0)
 164                 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
 165
 166         return ret;
 167 }
 168
 169 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 170 {
 171         unsigned char buf[2];
 172         int ret;
 173
 174         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 175         if (ret < 0) {
 176                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 177                         reg, ret);
 178                 return ret;
 179         }
 180
 181         ret = get_unaligned_be16(buf);
 182         if (!(ret & FG_15BIT_WORD_VALID)) {
 183                 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
 184                         reg);
 185                 return -ENXIO;
 186         }
 187
 188         return ret & FG_15BIT_VAL_MASK;
 189 }
 190
 191 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 192 {
 193         unsigned char buf[2];
 194         int ret;
 195
 196         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 197         if (ret < 0) {
 198                 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
 199                         reg, ret);
 200                 return ret;
 201         }
 202
 203         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 204         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 205 }
 206
 207 #ifdef CONFIG_DEBUG_FS
 208 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
 209 {
 210         struct axp288_fg_info *info = s->private;
 211         int raw_val, ret;
 212
 213         seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
 214                 AXP20X_PWR_INPUT_STATUS,
 215                 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
 216         seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
 217                 AXP20X_PWR_OP_MODE,
 218                 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
 219         seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
 220                 AXP20X_CHRG_CTRL1,
 221                 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
 222         seq_printf(s, "       VLTF[%02x] : %02x\n",
 223                 AXP20X_V_LTF_DISCHRG,
 224                 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
 225         seq_printf(s, "       VHTF[%02x] : %02x\n",
 226                 AXP20X_V_HTF_DISCHRG,
 227                 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
 228         seq_printf(s, "    CC_CTRL[%02x] : %02x\n",
 229                 AXP20X_CC_CTRL,
 230                 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
 231         seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
 232                 AXP20X_FG_RES,
 233                 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
 234         seq_printf(s, "    FG_RDC1[%02x] : %02x\n",
 235                 AXP288_FG_RDC1_REG,
 236                 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
 237         seq_printf(s, "    FG_RDC0[%02x] : %02x\n",
 238                 AXP288_FG_RDC0_REG,
 239                 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
 240         seq_printf(s, "     FG_OCV[%02x] : %04x\n",
 241                 AXP288_FG_OCVH_REG,
 242                 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
 243         seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
 244                 AXP288_FG_DES_CAP1_REG,
 245                 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
 246         seq_printf(s, "  FG_CC_MTR[%02x] : %04x\n",
 247                 AXP288_FG_CC_MTR1_REG,
 248                 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
 249         seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
 250                 AXP288_FG_OCV_CAP_REG,
 251                 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
 252         seq_printf(s, "  FG_CC_CAP[%02x] : %02x\n",
 253                 AXP288_FG_CC_CAP_REG,
 254                 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
 255         seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
 256                 AXP288_FG_LOW_CAP_REG,
 257                 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
 258         seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
 259                 AXP288_FG_TUNE0,
 260                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
 261         seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
 262                 AXP288_FG_TUNE1,
 263                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
 264         seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
 265                 AXP288_FG_TUNE2,
 266                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
 267         seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
 268                 AXP288_FG_TUNE3,
 269                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
 270         seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
 271                 AXP288_FG_TUNE4,
 272                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
 273         seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
 274                 AXP288_FG_TUNE5,
 275                 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
 276
 277         ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val);
 278         if (ret >= 0)
 279                 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
 280         ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val);
 281         if (ret >= 0)
 282                 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
 283         ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val);
 284         if (ret >= 0)
 285                 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
 286         ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val);
 287         if (ret >= 0)
 288                 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
 289         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val);
 290         if (ret >= 0)
 291                 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
 292         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 293         if (ret >= 0)
 294                 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
 295
 296         return 0;
 297 }
 298
 299 DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug);
 300
 301 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 302 {
 303         info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
 304                 info, &fuel_gauge_debug_fops);
 305 }
 306
 307 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 308 {
 309         debugfs_remove(info->debug_file);
 310 }
 311 #else
 312 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 313 {
 314 }
 315 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 316 {
 317 }
 318 #endif
 319
 320 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 321 {
 322         int pwr_stat, fg_res, curr, ret;
 323
 324         pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 325         if (pwr_stat < 0) {
 326                 dev_err(&info->pdev->dev,
 327                         "PWR STAT read failed:%d\n", pwr_stat);
 328                 return;
 329         }
 330
 331         /* Report full if Vbus is valid and the reported capacity is 100% */
 332         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 333                 goto not_full;
 334
 335         fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 336         if (fg_res < 0) {
 337                 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res);
 338                 return;
 339         }
 340         if (!(fg_res & FG_REP_CAP_VALID))
 341                 goto not_full;
 342
 343         fg_res &= ~FG_REP_CAP_VALID;
 344         if (fg_res == 100) {
 345                 info->status = POWER_SUPPLY_STATUS_FULL;
 346                 return;
 347         }
 348
 349         /*
 350          * Sometimes the charger turns itself off before fg-res reaches 100%.
 351          * When this happens the AXP288 reports a not-charging status and
 352          * 0 mA discharge current.
 353          */
 354         if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR))
 355                 goto not_full;
 356
 357         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr);
 358         if (ret < 0) {
 359                 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret);
 360                 return;
 361         }
 362         if (curr == 0) {
 363                 info->status = POWER_SUPPLY_STATUS_FULL;
 364                 return;
 365         }
 366
 367 not_full:
 368         if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
 369                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 370         else
 371                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 372 }
 373
 374 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
 375 {
 376         int ret = 0, raw_val;
 377
 378         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
 379         if (ret < 0)
 380                 goto vbatt_read_fail;
 381
 382         *vbatt = VOLTAGE_FROM_ADC(raw_val);
 383 vbatt_read_fail:
 384         return ret;
 385 }
 386
 387 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
 388 {
 389         int ret, discharge;
 390
 391         /* First check discharge current, so that we do only 1 read on bat. */
 392         ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
 393         if (ret < 0)
 394                 return ret;
 395
 396         if (discharge > 0) {
 397                 *cur = -1 * discharge;
 398                 return 0;
 399         }
 400
 401         return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
 402 }
 403
 404 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
 405 {
 406         int ret;
 407
 408         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 409         if (ret >= 0)
 410                 *vocv = VOLTAGE_FROM_ADC(ret);
 411
 412         return ret;
 413 }
 414
 415 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 416 {
 417         int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
 418
 419         ret = fuel_gauge_get_vocv(info, &vocv);
 420         if (ret < 0)
 421                 goto health_read_fail;
 422
 423         if (vocv > info->max_volt)
 424                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 425         else
 426                 health = POWER_SUPPLY_HEALTH_GOOD;
 427
 428 health_read_fail:
 429         return health;
 430 }
 431
 432 static int fuel_gauge_get_property(struct power_supply *ps,
 433                 enum power_supply_property prop,
 434                 union power_supply_propval *val)
 435 {
 436         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 437         int ret = 0, value;
 438
 439         mutex_lock(&info->lock);
 440         switch (prop) {
 441         case POWER_SUPPLY_PROP_STATUS:
 442                 fuel_gauge_get_status(info);
 443                 val->intval = info->status;
 444                 break;
 445         case POWER_SUPPLY_PROP_HEALTH:
 446                 val->intval = fuel_gauge_battery_health(info);
 447                 break;
 448         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 449                 ret = fuel_gauge_get_vbatt(info, &value);
 450                 if (ret < 0)
 451                         goto fuel_gauge_read_err;
 452                 val->intval = PROP_VOLT(value);
 453                 break;
 454         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 455                 ret = fuel_gauge_get_vocv(info, &value);
 456                 if (ret < 0)
 457                         goto fuel_gauge_read_err;
 458                 val->intval = PROP_VOLT(value);
 459                 break;
 460         case POWER_SUPPLY_PROP_CURRENT_NOW:
 461                 ret = fuel_gauge_get_current(info, &value);
 462                 if (ret < 0)
 463                         goto fuel_gauge_read_err;
 464                 val->intval = PROP_CURR(value);
 465                 break;
 466         case POWER_SUPPLY_PROP_PRESENT:
 467                 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 468                 if (ret < 0)
 469                         goto fuel_gauge_read_err;
 470
 471                 if (ret & CHRG_STAT_BAT_PRESENT)
 472                         val->intval = 1;
 473                 else
 474                         val->intval = 0;
 475                 break;
 476         case POWER_SUPPLY_PROP_CAPACITY:
 477                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 478                 if (ret < 0)
 479                         goto fuel_gauge_read_err;
 480
 481                 if (!(ret & FG_REP_CAP_VALID))
 482                         dev_err(&info->pdev->dev,
 483                                 "capacity measurement not valid\n");
 484                 val->intval = (ret & FG_REP_CAP_VAL_MASK);
 485                 break;
 486         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 487                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 488                 if (ret < 0)
 489                         goto fuel_gauge_read_err;
 490                 val->intval = (ret & 0x0f);
 491                 break;
 492         case POWER_SUPPLY_PROP_TECHNOLOGY:
 493                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 494                 break;
 495         case POWER_SUPPLY_PROP_CHARGE_NOW:
 496                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 497                 if (ret < 0)
 498                         goto fuel_gauge_read_err;
 499
 500                 val->intval = ret * FG_DES_CAP_RES_LSB;
 501                 break;
 502         case POWER_SUPPLY_PROP_CHARGE_FULL:
 503                 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 504                 if (ret < 0)
 505                         goto fuel_gauge_read_err;
 506
 507                 val->intval = ret * FG_DES_CAP_RES_LSB;
 508                 break;
 509         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 510                 val->intval = PROP_VOLT(info->max_volt);
 511                 break;
 512         default:
 513                 mutex_unlock(&info->lock);
 514                 return -EINVAL;
 515         }
 516
 517         mutex_unlock(&info->lock);
 518         return 0;
 519
 520 fuel_gauge_read_err:
 521         mutex_unlock(&info->lock);
 522         return ret;
 523 }
 524
 525 static int fuel_gauge_set_property(struct power_supply *ps,
 526                 enum power_supply_property prop,
 527                 const union power_supply_propval *val)
 528 {
 529         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 530         int ret = 0;
 531
 532         mutex_lock(&info->lock);
 533         switch (prop) {
 534         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 535                 if ((val->intval < 0) || (val->intval > 15)) {
 536                         ret = -EINVAL;
 537                         break;
 538                 }
 539                 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 540                 if (ret < 0)
 541                         break;
 542                 ret &= 0xf0;
 543                 ret |= (val->intval & 0xf);
 544                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
 545                 break;
 546         default:
 547                 ret = -EINVAL;
 548                 break;
 549         }
 550
 551         mutex_unlock(&info->lock);
 552         return ret;
 553 }
 554
 555 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 556         enum power_supply_property psp)
 557 {
 558         int ret;
 559
 560         switch (psp) {
 561         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 562                 ret = 1;
 563                 break;
 564         default:
 565                 ret = 0;
 566         }
 567
 568         return ret;
 569 }
 570
 571 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 572 {
 573         struct axp288_fg_info *info = dev;
 574         int i;
 575
 576         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 577                 if (info->irq[i] == irq)
 578                         break;
 579         }
 580
 581         if (i >= AXP288_FG_INTR_NUM) {
 582                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 583                 return IRQ_NONE;
 584         }
 585
 586         switch (i) {
 587         case QWBTU_IRQ:
 588                 dev_info(&info->pdev->dev,
 589                         "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 590                 break;
 591         case WBTU_IRQ:
 592                 dev_info(&info->pdev->dev,
 593                         "Battery under temperature in work mode IRQ (WBTU)\n");
 594                 break;
 595         case QWBTO_IRQ:
 596                 dev_info(&info->pdev->dev,
 597                         "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 598                 break;
 599         case WBTO_IRQ:
 600                 dev_info(&info->pdev->dev,
 601                         "Battery over temperature in work mode IRQ (WBTO)\n");
 602                 break;
 603         case WL2_IRQ:
 604                 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
 605                 break;
 606         case WL1_IRQ:
 607                 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
 608                 break;
 609         default:
 610                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 611         }
 612
 613         power_supply_changed(info->bat);
 614         return IRQ_HANDLED;
 615 }
 616
 617 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 618 {
 619         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 620
 621         power_supply_changed(info->bat);
 622 }
 623
 624 static const struct power_supply_desc fuel_gauge_desc = {
 625         .name                   = DEV_NAME,
 626         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 627         .properties             = fuel_gauge_props,
 628         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 629         .get_property           = fuel_gauge_get_property,
 630         .set_property           = fuel_gauge_set_property,
 631         .property_is_writeable  = fuel_gauge_property_is_writeable,
 632         .external_power_changed = fuel_gauge_external_power_changed,
 633 };
 634
 635 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
 636 {
 637         int ret, i, pirq;
 638
 639         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 640                 pirq = platform_get_irq(info->pdev, i);
 641                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 642                 if (info->irq[i] < 0) {
 643                         dev_warn(&info->pdev->dev,
 644                                 "regmap_irq get virq failed for IRQ %d: %d\n",
 645                                 pirq, info->irq[i]);
 646                         info->irq[i] = -1;
 647                         goto intr_failed;
 648                 }
 649                 ret = request_threaded_irq(info->irq[i],
 650                                 NULL, fuel_gauge_thread_handler,
 651                                 IRQF_ONESHOT, DEV_NAME, info);
 652                 if (ret) {
 653                         dev_warn(&info->pdev->dev,
 654                                 "request irq failed for IRQ %d: %d\n",
 655                                 pirq, info->irq[i]);
 656                         info->irq[i] = -1;
 657                         goto intr_failed;
 658                 } else {
 659                         dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
 660                                 pirq, info->irq[i]);
 661                 }
 662         }
 663         return;
 664
 665 intr_failed:
 666         for (; i > 0; i--) {
 667                 free_irq(info->irq[i - 1], info);
 668                 info->irq[i - 1] = -1;
 669         }
 670 }
 671
 672 /*
 673  * Some devices have no battery (HDMI sticks) and the axp288 battery's
 674  * detection reports one despite it not being there.
 675  * Please keep this listed sorted alphabetically.
 676  */
 677 static const struct dmi_system_id axp288_no_battery_list[] = {
 678         {
 679                 /* ACEPC T8 Cherry Trail Z8350 mini PC */
 680                 .matches = {
 681                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 682                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 683                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
 684                         /* also match on somewhat unique bios-version */
 685                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 686                 },
 687         },
 688         {
 689                 /* ACEPC T11 Cherry Trail Z8350 mini PC */
 690                 .matches = {
 691                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 692                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 693                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
 694                         /* also match on somewhat unique bios-version */
 695                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 696                 },
 697         },
 698         {
 699                 /* ECS EF20EA */
 700                 .matches = {
 701                         DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
 702                 },
 703         },
 704         {
 705                 /* Intel Cherry Trail Compute Stick, Windows version */
 706                 .matches = {
 707                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 708                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
 709                 },
 710         },
 711         {
 712                 /* Intel Cherry Trail Compute Stick, version without an OS */
 713                 .matches = {
 714                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 715                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
 716                 },
 717         },
 718         {
 719                 /* Meegopad T02 */
 720                 .matches = {
 721                         DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"),
 722                 },
 723         },
 724         {       /* Mele PCG03 Mini PC */
 725                 .matches = {
 726                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Mini PC"),
 727                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Mini PC"),
 728                 },
 729         },
 730         {
 731                 /* Minix Neo Z83-4 mini PC */
 732                 .matches = {
 733                         DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
 734                         DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
 735                 }
 736         },
 737         {
 738                 /* Various Ace PC/Meegopad/MinisForum/Wintel Mini-PCs/HDMI-sticks */
 739                 .matches = {
 740                         DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 741                         DMI_MATCH(DMI_CHASSIS_TYPE, "3"),
 742                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 743                         DMI_MATCH(DMI_BIOS_VERSION, "5.11"),
 744                 },
 745         },
 746         {}
 747 };
 748
 749 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 750 {
 751         int i, ret = 0;
 752         struct axp288_fg_info *info;
 753         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 754         struct power_supply_config psy_cfg = {};
 755         static const char * const iio_chan_name[] = {
 756                 [BAT_TEMP] = "axp288-batt-temp",
 757                 [PMIC_TEMP] = "axp288-pmic-temp",
 758                 [SYSTEM_TEMP] = "axp288-system-temp",
 759                 [BAT_CHRG_CURR] = "axp288-chrg-curr",
 760                 [BAT_D_CURR] = "axp288-chrg-d-curr",
 761                 [BAT_VOLT] = "axp288-batt-volt",
 762         };
 763         unsigned int val;
 764
 765         if (dmi_check_system(axp288_no_battery_list))
 766                 return -ENODEV;
 767
 768         /*
 769          * On some devices the fuelgauge and charger parts of the axp288 are
 770          * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
 771          */
 772         ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
 773         if (ret < 0)
 774                 return ret;
 775         if (val == 0)
 776                 return -ENODEV;
 777
 778         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 779         if (!info)
 780                 return -ENOMEM;
 781
 782         info->pdev = pdev;
 783         info->regmap = axp20x->regmap;
 784         info->regmap_irqc = axp20x->regmap_irqc;
 785         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 786
 787         platform_set_drvdata(pdev, info);
 788
 789         mutex_init(&info->lock);
 790
 791         for (i = 0; i < IIO_CHANNEL_NUM; i++) {
 792                 /*
 793                  * Note cannot use devm_iio_channel_get because x86 systems
 794                  * lack the device<->channel maps which iio_channel_get will
 795                  * try to use when passed a non NULL device pointer.
 796                  */
 797                 info->iio_channel[i] =
 798                         iio_channel_get(NULL, iio_chan_name[i]);
 799                 if (IS_ERR(info->iio_channel[i])) {
 800                         ret = PTR_ERR(info->iio_channel[i]);
 801                         dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
 802                                 iio_chan_name[i], ret);
 803                         /* Wait for axp288_adc to load */
 804                         if (ret == -ENODEV)
 805                                 ret = -EPROBE_DEFER;
 806
 807                         goto out_free_iio_chan;
 808                 }
 809         }
 810
 811         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 812         if (ret < 0)
 813                 goto out_free_iio_chan;
 814
 815         if (!(ret & FG_DES_CAP1_VALID)) {
 816                 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 817                 ret = -ENODEV;
 818                 goto out_free_iio_chan;
 819         }
 820
 821         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 822         if (ret < 0)
 823                 goto out_free_iio_chan;
 824         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 825         case CHRG_CCCV_CV_4100MV:
 826                 info->max_volt = 4100;
 827                 break;
 828         case CHRG_CCCV_CV_4150MV:
 829                 info->max_volt = 4150;
 830                 break;
 831         case CHRG_CCCV_CV_4200MV:
 832                 info->max_volt = 4200;
 833                 break;
 834         case CHRG_CCCV_CV_4350MV:
 835                 info->max_volt = 4350;
 836                 break;
 837         }
 838
 839         psy_cfg.drv_data = info;
 840         info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 841         if (IS_ERR(info->bat)) {
 842                 ret = PTR_ERR(info->bat);
 843                 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 844                 goto out_free_iio_chan;
 845         }
 846
 847         fuel_gauge_create_debugfs(info);
 848         fuel_gauge_init_irq(info);
 849
 850         return 0;
 851
 852 out_free_iio_chan:
 853         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 854                 if (!IS_ERR_OR_NULL(info->iio_channel[i]))
 855                         iio_channel_release(info->iio_channel[i]);
 856
 857         return ret;
 858 }
 859
 860 static const struct platform_device_id axp288_fg_id_table[] = {
 861         { .name = DEV_NAME },
 862         {},
 863 };
 864 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 865
 866 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 867 {
 868         struct axp288_fg_info *info = platform_get_drvdata(pdev);
 869         int i;
 870
 871         power_supply_unregister(info->bat);
 872         fuel_gauge_remove_debugfs(info);
 873
 874         for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 875                 if (info->irq[i] >= 0)
 876                         free_irq(info->irq[i], info);
 877
 878         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 879                 iio_channel_release(info->iio_channel[i]);
 880
 881         return 0;
 882 }
 883
 884 static struct platform_driver axp288_fuel_gauge_driver = {
 885         .probe = axp288_fuel_gauge_probe,
 886         .remove = axp288_fuel_gauge_remove,
 887         .id_table = axp288_fg_id_table,
 888         .driver = {
 889                 .name = DEV_NAME,
 890         },
 891 };
 892
 893 module_platform_driver(axp288_fuel_gauge_driver);
 894
 895 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 896 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 897 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 898 MODULE_LICENSE("GPL");