linux/drivers/power/supply/axp288_fuel_gauge.c
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   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
  91enum {
  92        QWBTU_IRQ = 0,
  93        WBTU_IRQ,
  94        QWBTO_IRQ,
  95        WBTO_IRQ,
  96        WL2_IRQ,
  97        WL1_IRQ,
  98};
  99
 100enum {
 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
 110struct 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
 123static 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
 138static 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
 159static 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
 171static 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
 193static 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
 210static 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
 301DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug);
 302
 303static 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
 309static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 310{
 311        debugfs_remove(info->debug_file);
 312}
 313#else
 314static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
 315{
 316}
 317static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
 318{
 319}
 320#endif
 321
 322static 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
 369not_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
 376static 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);
 385vbatt_read_fail:
 386        return ret;
 387}
 388
 389static 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
 406static 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
 417static 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
 430health_read_fail:
 431        return health;
 432}
 433
 434static 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
 522fuel_gauge_read_err:
 523        mutex_unlock(&info->lock);
 524        return ret;
 525}
 526
 527static 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
 557static 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
 573static 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
 619static 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
 626static 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
 637static 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
 667intr_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 */
 679static 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 Corporation"),
 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 Corporation"),
 717                        DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
 718                },
 719        },
 720        {
 721                /* Meegopad T08 */
 722                .matches = {
 723                        DMI_MATCH(DMI_SYS_VENDOR, "Default string"),
 724                        DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."),
 725                        DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 726                        DMI_MATCH(DMI_BOARD_VERSION, "V1.1"),
 727                },
 728        },
 729        {
 730                /* Minix Neo Z83-4 mini PC */
 731                .matches = {
 732                        DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
 733                        DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
 734                }
 735        },
 736        {}
 737};
 738
 739static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 740{
 741        int i, ret = 0;
 742        struct axp288_fg_info *info;
 743        struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 744        struct power_supply_config psy_cfg = {};
 745        static const char * const iio_chan_name[] = {
 746                [BAT_TEMP] = "axp288-batt-temp",
 747                [PMIC_TEMP] = "axp288-pmic-temp",
 748                [SYSTEM_TEMP] = "axp288-system-temp",
 749                [BAT_CHRG_CURR] = "axp288-chrg-curr",
 750                [BAT_D_CURR] = "axp288-chrg-d-curr",
 751                [BAT_VOLT] = "axp288-batt-volt",
 752        };
 753        unsigned int val;
 754
 755        if (dmi_check_system(axp288_fuel_gauge_blacklist))
 756                return -ENODEV;
 757
 758        /*
 759         * On some devices the fuelgauge and charger parts of the axp288 are
 760         * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
 761         */
 762        ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
 763        if (ret < 0)
 764                return ret;
 765        if (val == 0)
 766                return -ENODEV;
 767
 768        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 769        if (!info)
 770                return -ENOMEM;
 771
 772        info->pdev = pdev;
 773        info->regmap = axp20x->regmap;
 774        info->regmap_irqc = axp20x->regmap_irqc;
 775        info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 776
 777        platform_set_drvdata(pdev, info);
 778
 779        mutex_init(&info->lock);
 780
 781        for (i = 0; i < IIO_CHANNEL_NUM; i++) {
 782                /*
 783                 * Note cannot use devm_iio_channel_get because x86 systems
 784                 * lack the device<->channel maps which iio_channel_get will
 785                 * try to use when passed a non NULL device pointer.
 786                 */
 787                info->iio_channel[i] =
 788                        iio_channel_get(NULL, iio_chan_name[i]);
 789                if (IS_ERR(info->iio_channel[i])) {
 790                        ret = PTR_ERR(info->iio_channel[i]);
 791                        dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
 792                                iio_chan_name[i], ret);
 793                        /* Wait for axp288_adc to load */
 794                        if (ret == -ENODEV)
 795                                ret = -EPROBE_DEFER;
 796
 797                        goto out_free_iio_chan;
 798                }
 799        }
 800
 801        ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 802        if (ret < 0)
 803                goto out_free_iio_chan;
 804
 805        if (!(ret & FG_DES_CAP1_VALID)) {
 806                dev_err(&pdev->dev, "axp288 not configured by firmware\n");
 807                ret = -ENODEV;
 808                goto out_free_iio_chan;
 809        }
 810
 811        ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 812        if (ret < 0)
 813                goto out_free_iio_chan;
 814        switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 815        case CHRG_CCCV_CV_4100MV:
 816                info->max_volt = 4100;
 817                break;
 818        case CHRG_CCCV_CV_4150MV:
 819                info->max_volt = 4150;
 820                break;
 821        case CHRG_CCCV_CV_4200MV:
 822                info->max_volt = 4200;
 823                break;
 824        case CHRG_CCCV_CV_4350MV:
 825                info->max_volt = 4350;
 826                break;
 827        }
 828
 829        psy_cfg.drv_data = info;
 830        info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
 831        if (IS_ERR(info->bat)) {
 832                ret = PTR_ERR(info->bat);
 833                dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
 834                goto out_free_iio_chan;
 835        }
 836
 837        fuel_gauge_create_debugfs(info);
 838        fuel_gauge_init_irq(info);
 839
 840        return 0;
 841
 842out_free_iio_chan:
 843        for (i = 0; i < IIO_CHANNEL_NUM; i++)
 844                if (!IS_ERR_OR_NULL(info->iio_channel[i]))
 845                        iio_channel_release(info->iio_channel[i]);
 846
 847        return ret;
 848}
 849
 850static const struct platform_device_id axp288_fg_id_table[] = {
 851        { .name = DEV_NAME },
 852        {},
 853};
 854MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 855
 856static int axp288_fuel_gauge_remove(struct platform_device *pdev)
 857{
 858        struct axp288_fg_info *info = platform_get_drvdata(pdev);
 859        int i;
 860
 861        power_supply_unregister(info->bat);
 862        fuel_gauge_remove_debugfs(info);
 863
 864        for (i = 0; i < AXP288_FG_INTR_NUM; i++)
 865                if (info->irq[i] >= 0)
 866                        free_irq(info->irq[i], info);
 867
 868        for (i = 0; i < IIO_CHANNEL_NUM; i++)
 869                iio_channel_release(info->iio_channel[i]);
 870
 871        return 0;
 872}
 873
 874static struct platform_driver axp288_fuel_gauge_driver = {
 875        .probe = axp288_fuel_gauge_probe,
 876        .remove = axp288_fuel_gauge_remove,
 877        .id_table = axp288_fg_id_table,
 878        .driver = {
 879                .name = DEV_NAME,
 880        },
 881};
 882
 883module_platform_driver(axp288_fuel_gauge_driver);
 884
 885MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 886MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 887MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 888MODULE_LICENSE("GPL");
 889