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) 2020-2021 Andrejus Basovas <xxx@yyy.tld>
   6  * Copyright (C) 2016-2021 Hans de Goede <hdegoede@redhat.com>
   7  * Copyright (C) 2014 Intel Corporation
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  */
  11
  12 #include <linux/acpi.h>
  13 #include <linux/dmi.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mfd/axp20x.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/iio/consumer.h>
  24 #include <asm/unaligned.h>
  25 #include <asm/iosf_mbi.h>
  26
  27 #define PS_STAT_VBUS_TRIGGER                    (1 << 0)
  28 #define PS_STAT_BAT_CHRG_DIR                    (1 << 2)
  29 #define PS_STAT_VBAT_ABOVE_VHOLD                (1 << 3)
  30 #define PS_STAT_VBUS_VALID                      (1 << 4)
  31 #define PS_STAT_VBUS_PRESENT                    (1 << 5)
  32
  33 #define CHRG_STAT_BAT_SAFE_MODE                 (1 << 3)
  34 #define CHRG_STAT_BAT_VALID                     (1 << 4)
  35 #define CHRG_STAT_BAT_PRESENT                   (1 << 5)
  36 #define CHRG_STAT_CHARGING                      (1 << 6)
  37 #define CHRG_STAT_PMIC_OTP                      (1 << 7)
  38
  39 #define CHRG_CCCV_CC_MASK                       0xf     /* 4 bits */
  40 #define CHRG_CCCV_CC_BIT_POS                    0
  41 #define CHRG_CCCV_CC_OFFSET                     200     /* 200mA */
  42 #define CHRG_CCCV_CC_LSB_RES                    200     /* 200mA */
  43 #define CHRG_CCCV_ITERM_20P                     (1 << 4)    /* 20% of CC */
  44 #define CHRG_CCCV_CV_MASK                       0x60        /* 2 bits */
  45 #define CHRG_CCCV_CV_BIT_POS                    5
  46 #define CHRG_CCCV_CV_4100MV                     0x0     /* 4.10V */
  47 #define CHRG_CCCV_CV_4150MV                     0x1     /* 4.15V */
  48 #define CHRG_CCCV_CV_4200MV                     0x2     /* 4.20V */
  49 #define CHRG_CCCV_CV_4350MV                     0x3     /* 4.35V */
  50 #define CHRG_CCCV_CHG_EN                        (1 << 7)
  51
  52 #define FG_CNTL_OCV_ADJ_STAT                    (1 << 2)
  53 #define FG_CNTL_OCV_ADJ_EN                      (1 << 3)
  54 #define FG_CNTL_CAP_ADJ_STAT                    (1 << 4)
  55 #define FG_CNTL_CAP_ADJ_EN                      (1 << 5)
  56 #define FG_CNTL_CC_EN                           (1 << 6)
  57 #define FG_CNTL_GAUGE_EN                        (1 << 7)
  58
  59 #define FG_15BIT_WORD_VALID                     (1 << 15)
  60 #define FG_15BIT_VAL_MASK                       0x7fff
  61
  62 #define FG_REP_CAP_VALID                        (1 << 7)
  63 #define FG_REP_CAP_VAL_MASK                     0x7F
  64
  65 #define FG_DES_CAP1_VALID                       (1 << 7)
  66 #define FG_DES_CAP_RES_LSB                      1456    /* 1.456mAhr */
  67
  68 #define FG_DES_CC_RES_LSB                       1456    /* 1.456mAhr */
  69
  70 #define FG_OCV_CAP_VALID                        (1 << 7)
  71 #define FG_OCV_CAP_VAL_MASK                     0x7F
  72 #define FG_CC_CAP_VALID                         (1 << 7)
  73 #define FG_CC_CAP_VAL_MASK                      0x7F
  74
  75 #define FG_LOW_CAP_THR1_MASK                    0xf0    /* 5% tp 20% */
  76 #define FG_LOW_CAP_THR1_VAL                     0xa0    /* 15 perc */
  77 #define FG_LOW_CAP_THR2_MASK                    0x0f    /* 0% to 15% */
  78 #define FG_LOW_CAP_WARN_THR                     14  /* 14 perc */
  79 #define FG_LOW_CAP_CRIT_THR                     4   /* 4 perc */
  80 #define FG_LOW_CAP_SHDN_THR                     0   /* 0 perc */
  81
  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_REG_UPDATE_INTERVAL              (60 * HZ)
  91 #define AXP288_FG_INTR_NUM                      6
  92
  93 #define AXP288_QUIRK_NO_BATTERY                 BIT(0)
  94
  95 static bool no_current_sense_res;
  96 module_param(no_current_sense_res, bool, 0444);
  97 MODULE_PARM_DESC(no_current_sense_res, "No (or broken) current sense resistor");
  98
  99 enum {
 100         QWBTU_IRQ = 0,
 101         WBTU_IRQ,
 102         QWBTO_IRQ,
 103         WBTO_IRQ,
 104         WL2_IRQ,
 105         WL1_IRQ,
 106 };
 107
 108 enum {
 109         BAT_CHRG_CURR,
 110         BAT_D_CURR,
 111         BAT_VOLT,
 112         IIO_CHANNEL_NUM
 113 };
 114
 115 struct axp288_fg_info {
 116         struct device *dev;
 117         struct regmap *regmap;
 118         int irq[AXP288_FG_INTR_NUM];
 119         struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
 120         struct power_supply *bat;
 121         struct mutex lock;
 122         int status;
 123         int max_volt;
 124         int pwr_op;
 125         int low_cap;
 126         struct dentry *debug_file;
 127
 128         char valid;                 /* zero until following fields are valid */
 129         unsigned long last_updated; /* in jiffies */
 130
 131         int pwr_stat;
 132         int fg_res;
 133         int bat_volt;
 134         int d_curr;
 135         int c_curr;
 136         int ocv;
 137         int fg_cc_mtr1;
 138         int fg_des_cap1;
 139 };
 140
 141 static enum power_supply_property fuel_gauge_props[] = {
 142         POWER_SUPPLY_PROP_STATUS,
 143         POWER_SUPPLY_PROP_PRESENT,
 144         POWER_SUPPLY_PROP_HEALTH,
 145         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 146         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 147         POWER_SUPPLY_PROP_VOLTAGE_OCV,
 148         POWER_SUPPLY_PROP_CAPACITY,
 149         POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
 150         POWER_SUPPLY_PROP_TECHNOLOGY,
 151         /* The 3 props below are not used when no_current_sense_res is set */
 152         POWER_SUPPLY_PROP_CHARGE_FULL,
 153         POWER_SUPPLY_PROP_CHARGE_NOW,
 154         POWER_SUPPLY_PROP_CURRENT_NOW,
 155 };
 156
 157 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
 158 {
 159         unsigned int val;
 160         int ret;
 161
 162         ret = regmap_read(info->regmap, reg, &val);
 163         if (ret < 0) {
 164                 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
 165                 return ret;
 166         }
 167
 168         return val;
 169 }
 170
 171 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
 172 {
 173         int ret;
 174
 175         ret = regmap_write(info->regmap, reg, (unsigned int)val);
 176
 177         if (ret < 0)
 178                 dev_err(info->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
 179
 180         return ret;
 181 }
 182
 183 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
 184 {
 185         unsigned char buf[2];
 186         int ret;
 187
 188         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 189         if (ret < 0) {
 190                 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
 191                 return ret;
 192         }
 193
 194         ret = get_unaligned_be16(buf);
 195         if (!(ret & FG_15BIT_WORD_VALID)) {
 196                 dev_err(info->dev, "Error reg 0x%02x contents not valid\n", reg);
 197                 return -ENXIO;
 198         }
 199
 200         return ret & FG_15BIT_VAL_MASK;
 201 }
 202
 203 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
 204 {
 205         unsigned char buf[2];
 206         int ret;
 207
 208         ret = regmap_bulk_read(info->regmap, reg, buf, 2);
 209         if (ret < 0) {
 210                 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
 211                 return ret;
 212         }
 213
 214         /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
 215         return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
 216 }
 217
 218 static int fuel_gauge_update_registers(struct axp288_fg_info *info)
 219 {
 220         int ret;
 221
 222         if (info->valid && time_before(jiffies, info->last_updated + AXP288_REG_UPDATE_INTERVAL))
 223                 return 0;
 224
 225         dev_dbg(info->dev, "Fuel Gauge updating register values...\n");
 226
 227         ret = iosf_mbi_block_punit_i2c_access();
 228         if (ret < 0)
 229                 return ret;
 230
 231         ret = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
 232         if (ret < 0)
 233                 goto out;
 234         info->pwr_stat = ret;
 235
 236         if (no_current_sense_res)
 237                 ret = fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG);
 238         else
 239                 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
 240         if (ret < 0)
 241                 goto out;
 242         info->fg_res = ret;
 243
 244         ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &info->bat_volt);
 245         if (ret < 0)
 246                 goto out;
 247
 248         ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
 249         if (ret < 0)
 250                 goto out;
 251         info->ocv = ret;
 252
 253         if (no_current_sense_res)
 254                 goto out_no_current_sense_res;
 255
 256         if (info->pwr_stat & PS_STAT_BAT_CHRG_DIR) {
 257                 info->d_curr = 0;
 258                 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &info->c_curr);
 259                 if (ret < 0)
 260                         goto out;
 261         } else {
 262                 info->c_curr = 0;
 263                 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &info->d_curr);
 264                 if (ret < 0)
 265                         goto out;
 266         }
 267
 268         ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
 269         if (ret < 0)
 270                 goto out;
 271         info->fg_cc_mtr1 = ret;
 272
 273         ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
 274         if (ret < 0)
 275                 goto out;
 276         info->fg_des_cap1 = ret;
 277
 278 out_no_current_sense_res:
 279         info->last_updated = jiffies;
 280         info->valid = 1;
 281         ret = 0;
 282 out:
 283         iosf_mbi_unblock_punit_i2c_access();
 284         return ret;
 285 }
 286
 287 static void fuel_gauge_get_status(struct axp288_fg_info *info)
 288 {
 289         int pwr_stat = info->pwr_stat;
 290         int fg_res = info->fg_res;
 291         int curr = info->d_curr;
 292
 293         /* Report full if Vbus is valid and the reported capacity is 100% */
 294         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 295                 goto not_full;
 296
 297         if (!(fg_res & FG_REP_CAP_VALID))
 298                 goto not_full;
 299
 300         fg_res &= ~FG_REP_CAP_VALID;
 301         if (fg_res == 100) {
 302                 info->status = POWER_SUPPLY_STATUS_FULL;
 303                 return;
 304         }
 305
 306         /*
 307          * Sometimes the charger turns itself off before fg-res reaches 100%.
 308          * When this happens the AXP288 reports a not-charging status and
 309          * 0 mA discharge current.
 310          */
 311         if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR) || no_current_sense_res)
 312                 goto not_full;
 313
 314         if (curr == 0) {
 315                 info->status = POWER_SUPPLY_STATUS_FULL;
 316                 return;
 317         }
 318
 319 not_full:
 320         if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
 321                 info->status = POWER_SUPPLY_STATUS_CHARGING;
 322         else
 323                 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
 324 }
 325
 326 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
 327 {
 328         int vocv = VOLTAGE_FROM_ADC(info->ocv);
 329         int health = POWER_SUPPLY_HEALTH_UNKNOWN;
 330
 331         if (vocv > info->max_volt)
 332                 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 333         else
 334                 health = POWER_SUPPLY_HEALTH_GOOD;
 335
 336         return health;
 337 }
 338
 339 static int fuel_gauge_get_property(struct power_supply *ps,
 340                 enum power_supply_property prop,
 341                 union power_supply_propval *val)
 342 {
 343         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 344         int ret, value;
 345
 346         mutex_lock(&info->lock);
 347
 348         ret = fuel_gauge_update_registers(info);
 349         if (ret < 0)
 350                 goto out;
 351
 352         switch (prop) {
 353         case POWER_SUPPLY_PROP_STATUS:
 354                 fuel_gauge_get_status(info);
 355                 val->intval = info->status;
 356                 break;
 357         case POWER_SUPPLY_PROP_HEALTH:
 358                 val->intval = fuel_gauge_battery_health(info);
 359                 break;
 360         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 361                 value = VOLTAGE_FROM_ADC(info->bat_volt);
 362                 val->intval = PROP_VOLT(value);
 363                 break;
 364         case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 365                 value = VOLTAGE_FROM_ADC(info->ocv);
 366                 val->intval = PROP_VOLT(value);
 367                 break;
 368         case POWER_SUPPLY_PROP_CURRENT_NOW:
 369                 if (info->d_curr > 0)
 370                         value = -1 * info->d_curr;
 371                 else
 372                         value = info->c_curr;
 373
 374                 val->intval = PROP_CURR(value);
 375                 break;
 376         case POWER_SUPPLY_PROP_PRESENT:
 377                 if (info->pwr_op & CHRG_STAT_BAT_PRESENT)
 378                         val->intval = 1;
 379                 else
 380                         val->intval = 0;
 381                 break;
 382         case POWER_SUPPLY_PROP_CAPACITY:
 383                 if (!(info->fg_res & FG_REP_CAP_VALID))
 384                         dev_err(info->dev, "capacity measurement not valid\n");
 385                 val->intval = (info->fg_res & FG_REP_CAP_VAL_MASK);
 386                 break;
 387         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 388                 val->intval = (info->low_cap & 0x0f);
 389                 break;
 390         case POWER_SUPPLY_PROP_TECHNOLOGY:
 391                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 392                 break;
 393         case POWER_SUPPLY_PROP_CHARGE_NOW:
 394                 val->intval = info->fg_cc_mtr1 * FG_DES_CAP_RES_LSB;
 395                 break;
 396         case POWER_SUPPLY_PROP_CHARGE_FULL:
 397                 val->intval = info->fg_des_cap1 * FG_DES_CAP_RES_LSB;
 398                 break;
 399         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 400                 val->intval = PROP_VOLT(info->max_volt);
 401                 break;
 402         default:
 403                 ret = -EINVAL;
 404         }
 405
 406 out:
 407         mutex_unlock(&info->lock);
 408         return ret;
 409 }
 410
 411 static int fuel_gauge_set_property(struct power_supply *ps,
 412                 enum power_supply_property prop,
 413                 const union power_supply_propval *val)
 414 {
 415         struct axp288_fg_info *info = power_supply_get_drvdata(ps);
 416         int new_low_cap, ret = 0;
 417
 418         mutex_lock(&info->lock);
 419         switch (prop) {
 420         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 421                 if ((val->intval < 0) || (val->intval > 15)) {
 422                         ret = -EINVAL;
 423                         break;
 424                 }
 425                 new_low_cap = info->low_cap;
 426                 new_low_cap &= 0xf0;
 427                 new_low_cap |= (val->intval & 0xf);
 428                 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, new_low_cap);
 429                 if (ret == 0)
 430                         info->low_cap = new_low_cap;
 431                 break;
 432         default:
 433                 ret = -EINVAL;
 434                 break;
 435         }
 436
 437         mutex_unlock(&info->lock);
 438         return ret;
 439 }
 440
 441 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
 442         enum power_supply_property psp)
 443 {
 444         int ret;
 445
 446         switch (psp) {
 447         case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
 448                 ret = 1;
 449                 break;
 450         default:
 451                 ret = 0;
 452         }
 453
 454         return ret;
 455 }
 456
 457 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
 458 {
 459         struct axp288_fg_info *info = dev;
 460         int i;
 461
 462         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 463                 if (info->irq[i] == irq)
 464                         break;
 465         }
 466
 467         if (i >= AXP288_FG_INTR_NUM) {
 468                 dev_warn(info->dev, "spurious interrupt!!\n");
 469                 return IRQ_NONE;
 470         }
 471
 472         switch (i) {
 473         case QWBTU_IRQ:
 474                 dev_info(info->dev, "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
 475                 break;
 476         case WBTU_IRQ:
 477                 dev_info(info->dev, "Battery under temperature in work mode IRQ (WBTU)\n");
 478                 break;
 479         case QWBTO_IRQ:
 480                 dev_info(info->dev, "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
 481                 break;
 482         case WBTO_IRQ:
 483                 dev_info(info->dev, "Battery over temperature in work mode IRQ (WBTO)\n");
 484                 break;
 485         case WL2_IRQ:
 486                 dev_info(info->dev, "Low Batt Warning(2) INTR\n");
 487                 break;
 488         case WL1_IRQ:
 489                 dev_info(info->dev, "Low Batt Warning(1) INTR\n");
 490                 break;
 491         default:
 492                 dev_warn(info->dev, "Spurious Interrupt!!!\n");
 493         }
 494
 495         mutex_lock(&info->lock);
 496         info->valid = 0; /* Force updating of the cached registers */
 497         mutex_unlock(&info->lock);
 498
 499         power_supply_changed(info->bat);
 500         return IRQ_HANDLED;
 501 }
 502
 503 static void fuel_gauge_external_power_changed(struct power_supply *psy)
 504 {
 505         struct axp288_fg_info *info = power_supply_get_drvdata(psy);
 506
 507         mutex_lock(&info->lock);
 508         info->valid = 0; /* Force updating of the cached registers */
 509         mutex_unlock(&info->lock);
 510         power_supply_changed(psy);
 511 }
 512
 513 static struct power_supply_desc fuel_gauge_desc = {
 514         .name                   = DEV_NAME,
 515         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 516         .properties             = fuel_gauge_props,
 517         .num_properties         = ARRAY_SIZE(fuel_gauge_props),
 518         .get_property           = fuel_gauge_get_property,
 519         .set_property           = fuel_gauge_set_property,
 520         .property_is_writeable  = fuel_gauge_property_is_writeable,
 521         .external_power_changed = fuel_gauge_external_power_changed,
 522 };
 523
 524 /*
 525  * Some devices have no battery (HDMI sticks) and the axp288 battery's
 526  * detection reports one despite it not being there.
 527  * Please keep this listed sorted alphabetically.
 528  */
 529 static const struct dmi_system_id axp288_quirks[] = {
 530         {
 531                 /* ACEPC T8 Cherry Trail Z8350 mini PC */
 532                 .matches = {
 533                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 534                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 535                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
 536                         /* also match on somewhat unique bios-version */
 537                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 538                 },
 539                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 540         },
 541         {
 542                 /* ACEPC T11 Cherry Trail Z8350 mini PC */
 543                 .matches = {
 544                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
 545                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
 546                         DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
 547                         /* also match on somewhat unique bios-version */
 548                         DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
 549                 },
 550                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 551         },
 552         {
 553                 /* Intel Bay Trail Compute Stick */
 554                 .matches = {
 555                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 556                         /* Partial match for STCK1A32WFC STCK1A32FC, STCK1A8LFC variants */
 557                         DMI_MATCH(DMI_PRODUCT_NAME, "STCK1A"),
 558                 },
 559                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 560         },
 561         {
 562                 /* Intel Cherry Trail Compute Stick */
 563                 .matches = {
 564                         DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
 565                         /* Partial match for STK1AW32SC and STK1A32SC variants */
 566                         DMI_MATCH(DMI_PRODUCT_NAME, "STK1A"),
 567                 },
 568                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 569         },
 570         {
 571                 /* Meegopad T02 */
 572                 .matches = {
 573                         DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"),
 574                 },
 575                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 576         },
 577         {       /* Mele PCG03 Mini PC */
 578                 .matches = {
 579                         DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Mini PC"),
 580                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Mini PC"),
 581                 },
 582                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 583         },
 584         {
 585                 /* Minix Neo Z83-4 mini PC */
 586                 .matches = {
 587                         DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
 588                         DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
 589                 },
 590                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 591         },
 592         {
 593                 /*
 594                  * One Mix 1, this uses the "T3 MRD" boardname used by
 595                  * generic mini PCs, but it is a mini laptop so it does
 596                  * actually have a battery!
 597                  */
 598                 .matches = {
 599                         DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 600                         DMI_MATCH(DMI_BIOS_DATE, "06/14/2018"),
 601                 },
 602                 .driver_data = NULL,
 603         },
 604         {
 605                 /* Radxa ROCK Pi X Single Board Computer */
 606                 .matches = {
 607                         DMI_MATCH(DMI_BOARD_NAME, "ROCK Pi X"),
 608                         DMI_MATCH(DMI_BOARD_VENDOR, "Radxa"),
 609                 },
 610                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 611         },
 612         {
 613                 /*
 614                  * Various Ace PC/Meegopad/MinisForum/Wintel Mini-PCs/HDMI-sticks
 615                  * This entry must be last because it is generic, this allows
 616                  * adding more specifuc quirks overriding this generic entry.
 617                  */
 618                 .matches = {
 619                         DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
 620                         DMI_MATCH(DMI_CHASSIS_TYPE, "3"),
 621                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 622                 },
 623                 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
 624         },
 625         {}
 626 };
 627
 628 static int axp288_fuel_gauge_read_initial_regs(struct axp288_fg_info *info)
 629 {
 630         unsigned int val;
 631         int ret;
 632
 633         /*
 634          * On some devices the fuelgauge and charger parts of the axp288 are
 635          * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
 636          */
 637         ret = regmap_read(info->regmap, AXP20X_CC_CTRL, &val);
 638         if (ret < 0)
 639                 return ret;
 640         if (val == 0)
 641                 return -ENODEV;
 642
 643         ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
 644         if (ret < 0)
 645                 return ret;
 646
 647         if (!(ret & FG_DES_CAP1_VALID)) {
 648                 dev_err(info->dev, "axp288 not configured by firmware\n");
 649                 return -ENODEV;
 650         }
 651
 652         ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
 653         if (ret < 0)
 654                 return ret;
 655         switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
 656         case CHRG_CCCV_CV_4100MV:
 657                 info->max_volt = 4100;
 658                 break;
 659         case CHRG_CCCV_CV_4150MV:
 660                 info->max_volt = 4150;
 661                 break;
 662         case CHRG_CCCV_CV_4200MV:
 663                 info->max_volt = 4200;
 664                 break;
 665         case CHRG_CCCV_CV_4350MV:
 666                 info->max_volt = 4350;
 667                 break;
 668         }
 669
 670         ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
 671         if (ret < 0)
 672                 return ret;
 673         info->pwr_op = ret;
 674
 675         ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
 676         if (ret < 0)
 677                 return ret;
 678         info->low_cap = ret;
 679
 680         return 0;
 681 }
 682
 683 static void axp288_fuel_gauge_release_iio_chans(void *data)
 684 {
 685         struct axp288_fg_info *info = data;
 686         int i;
 687
 688         for (i = 0; i < IIO_CHANNEL_NUM; i++)
 689                 if (!IS_ERR_OR_NULL(info->iio_channel[i]))
 690                         iio_channel_release(info->iio_channel[i]);
 691 }
 692
 693 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
 694 {
 695         struct axp288_fg_info *info;
 696         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 697         struct power_supply_config psy_cfg = {};
 698         static const char * const iio_chan_name[] = {
 699                 [BAT_CHRG_CURR] = "axp288-chrg-curr",
 700                 [BAT_D_CURR] = "axp288-chrg-d-curr",
 701                 [BAT_VOLT] = "axp288-batt-volt",
 702         };
 703         const struct dmi_system_id *dmi_id;
 704         struct device *dev = &pdev->dev;
 705         unsigned long quirks = 0;
 706         int i, pirq, ret;
 707
 708         /*
 709          * Normally the native AXP288 fg/charger drivers are preferred but
 710          * on some devices the ACPI drivers should be used instead.
 711          */
 712         if (!acpi_quirk_skip_acpi_ac_and_battery())
 713                 return -ENODEV;
 714
 715         dmi_id = dmi_first_match(axp288_quirks);
 716         if (dmi_id)
 717                 quirks = (unsigned long)dmi_id->driver_data;
 718
 719         if (quirks & AXP288_QUIRK_NO_BATTERY)
 720                 return -ENODEV;
 721
 722         info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 723         if (!info)
 724                 return -ENOMEM;
 725
 726         info->dev = dev;
 727         info->regmap = axp20x->regmap;
 728         info->status = POWER_SUPPLY_STATUS_UNKNOWN;
 729         info->valid = 0;
 730
 731         platform_set_drvdata(pdev, info);
 732
 733         mutex_init(&info->lock);
 734
 735         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 736                 pirq = platform_get_irq(pdev, i);
 737                 if (pirq < 0)
 738                         continue;
 739                 ret = regmap_irq_get_virq(axp20x->regmap_irqc, pirq);
 740                 if (ret < 0)
 741                         return dev_err_probe(dev, ret, "getting vIRQ %d\n", pirq);
 742
 743                 info->irq[i] = ret;
 744         }
 745
 746         for (i = 0; i < IIO_CHANNEL_NUM; i++) {
 747                 /*
 748                  * Note cannot use devm_iio_channel_get because x86 systems
 749                  * lack the device<->channel maps which iio_channel_get will
 750                  * try to use when passed a non NULL device pointer.
 751                  */
 752                 info->iio_channel[i] =
 753                         iio_channel_get(NULL, iio_chan_name[i]);
 754                 if (IS_ERR(info->iio_channel[i])) {
 755                         ret = PTR_ERR(info->iio_channel[i]);
 756                         dev_dbg(dev, "error getting iiochan %s: %d\n", iio_chan_name[i], ret);
 757                         /* Wait for axp288_adc to load */
 758                         if (ret == -ENODEV)
 759                                 ret = -EPROBE_DEFER;
 760
 761                         axp288_fuel_gauge_release_iio_chans(info);
 762                         return ret;
 763                 }
 764         }
 765
 766         ret = devm_add_action_or_reset(dev, axp288_fuel_gauge_release_iio_chans, info);
 767         if (ret)
 768                 return ret;
 769
 770         ret = iosf_mbi_block_punit_i2c_access();
 771         if (ret < 0)
 772                 return ret;
 773
 774         ret = axp288_fuel_gauge_read_initial_regs(info);
 775         iosf_mbi_unblock_punit_i2c_access();
 776         if (ret < 0)
 777                 return ret;
 778
 779         psy_cfg.drv_data = info;
 780         if (no_current_sense_res)
 781                 fuel_gauge_desc.num_properties = ARRAY_SIZE(fuel_gauge_props) - 3;
 782         info->bat = devm_power_supply_register(dev, &fuel_gauge_desc, &psy_cfg);
 783         if (IS_ERR(info->bat)) {
 784                 ret = PTR_ERR(info->bat);
 785                 dev_err(dev, "failed to register battery: %d\n", ret);
 786                 return ret;
 787         }
 788
 789         for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
 790                 ret = devm_request_threaded_irq(dev, info->irq[i], NULL,
 791                                                 fuel_gauge_thread_handler,
 792                                                 IRQF_ONESHOT, DEV_NAME, info);
 793                 if (ret)
 794                         return dev_err_probe(dev, ret, "requesting IRQ %d\n", info->irq[i]);
 795         }
 796
 797         return 0;
 798 }
 799
 800 static const struct platform_device_id axp288_fg_id_table[] = {
 801         { .name = DEV_NAME },
 802         {},
 803 };
 804 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
 805
 806 static struct platform_driver axp288_fuel_gauge_driver = {
 807         .probe = axp288_fuel_gauge_probe,
 808         .id_table = axp288_fg_id_table,
 809         .driver = {
 810                 .name = DEV_NAME,
 811         },
 812 };
 813
 814 module_platform_driver(axp288_fuel_gauge_driver);
 815
 816 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 817 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
 818 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
 819 MODULE_LICENSE("GPL");