drivers/power/supply/max14577

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This source file includes following definitions.
maxim_get_charger_type
max14577_get_charger_state
max14577_get_charge_type
max14577_get_online
max14577_get_battery_health
max14577_get_present
max14577_set_fast_charge_timer
max14577_init_constant_voltage
max14577_init_eoc
max14577_init_fast_charge
max14577_charger_reg_init
max14577_charger_get_property
max14577_charger_dt_init
max14577_charger_dt_init
show_fast_charge_timer
store_fast_charge_timer
max14577_charger_probe
max14577_charger_remove
   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max14577_charger.c - Battery charger driver for the Maxim 14577/77836
   4 //
   5 // Copyright (C) 2013,2014 Samsung Electronics
   6 // Krzysztof Kozlowski <krzk@kernel.org>
   7 
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/power_supply.h>
  11 #include <linux/mfd/max14577-private.h>
  12 #include <linux/mfd/max14577.h>
  13 
  14 struct max14577_charger {
  15         struct device           *dev;
  16         struct max14577         *max14577;
  17         struct power_supply     *charger;
  18 
  19         struct max14577_charger_platform_data   *pdata;
  20 };
  21 
  22 /*
  23  * Helper function for mapping values of STATUS2/CHGTYP register on max14577
  24  * and max77836 chipsets to enum maxim_muic_charger_type.
  25  */
  26 static enum max14577_muic_charger_type maxim_get_charger_type(
  27                 enum maxim_device_type dev_type, u8 val) {
  28         switch (val) {
  29         case MAX14577_CHARGER_TYPE_NONE:
  30         case MAX14577_CHARGER_TYPE_USB:
  31         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
  32         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
  33         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
  34         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
  35                 return val;
  36         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
  37         case MAX14577_CHARGER_TYPE_RESERVED:
  38                 if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
  39                         val |= 0x8;
  40                 return val;
  41         default:
  42                 WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
  43                 return val;
  44         }
  45 }
  46 
  47 static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
  48 {
  49         struct regmap *rmap = chg->max14577->regmap;
  50         int ret;
  51         u8 reg_data;
  52 
  53         /*
  54          * Charging occurs only if:
  55          *  - CHGCTRL2/MBCHOSTEN == 1
  56          *  - STATUS2/CGMBC == 1
  57          *
  58          * TODO:
  59          *  - handle FULL after Top-off timer (EOC register may be off
  60          *    and the charger won't be charging although MBCHOSTEN is on)
  61          *  - handle properly dead-battery charging (respect timer)
  62          *  - handle timers (fast-charge and prequal) /MBCCHGERR/
  63          */
  64         ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
  65         if (ret < 0)
  66                 goto out;
  67 
  68         if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
  69                 *val = POWER_SUPPLY_STATUS_DISCHARGING;
  70                 goto out;
  71         }
  72 
  73         ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
  74         if (ret < 0)
  75                 goto out;
  76 
  77         if (reg_data & STATUS3_CGMBC_MASK) {
  78                 /* Charger or USB-cable is connected */
  79                 if (reg_data & STATUS3_EOC_MASK)
  80                         *val = POWER_SUPPLY_STATUS_FULL;
  81                 else
  82                         *val = POWER_SUPPLY_STATUS_CHARGING;
  83                 goto out;
  84         }
  85 
  86         *val = POWER_SUPPLY_STATUS_DISCHARGING;
  87 
  88 out:
  89         return ret;
  90 }
  91 
  92 /*
  93  * Supported charge types:
  94  *  - POWER_SUPPLY_CHARGE_TYPE_NONE
  95  *  - POWER_SUPPLY_CHARGE_TYPE_FAST
  96  */
  97 static int max14577_get_charge_type(struct max14577_charger *chg, int *val)
  98 {
  99         int ret, charging;
 100 
 101         /*
 102          * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
 103          * As spec says:
 104          * [after reaching EOC interrupt]
 105          * "When the battery is fully charged, the 30-minute (typ)
 106          *  top-off timer starts. The device continues to trickle
 107          *  charge the battery until the top-off timer runs out."
 108          */
 109         ret = max14577_get_charger_state(chg, &charging);
 110         if (ret < 0)
 111                 return ret;
 112 
 113         if (charging == POWER_SUPPLY_STATUS_CHARGING)
 114                 *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
 115         else
 116                 *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
 117 
 118         return 0;
 119 }
 120 
 121 static int max14577_get_online(struct max14577_charger *chg, int *val)
 122 {
 123         struct regmap *rmap = chg->max14577->regmap;
 124         u8 reg_data;
 125         int ret;
 126         enum max14577_muic_charger_type chg_type;
 127 
 128         ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 129         if (ret < 0)
 130                 return ret;
 131 
 132         reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 133         chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 134         switch (chg_type) {
 135         case MAX14577_CHARGER_TYPE_USB:
 136         case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
 137         case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
 138         case MAX14577_CHARGER_TYPE_SPECIAL_1A:
 139         case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
 140         case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
 141                 *val = 1;
 142                 break;
 143         case MAX14577_CHARGER_TYPE_NONE:
 144         case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
 145         case MAX14577_CHARGER_TYPE_RESERVED:
 146         case MAX77836_CHARGER_TYPE_RESERVED:
 147         default:
 148                 *val = 0;
 149         }
 150 
 151         return 0;
 152 }
 153 
 154 /*
 155  * Supported health statuses:
 156  *  - POWER_SUPPLY_HEALTH_DEAD
 157  *  - POWER_SUPPLY_HEALTH_OVERVOLTAGE
 158  *  - POWER_SUPPLY_HEALTH_GOOD
 159  */
 160 static int max14577_get_battery_health(struct max14577_charger *chg, int *val)
 161 {
 162         struct regmap *rmap = chg->max14577->regmap;
 163         int ret;
 164         u8 reg_data;
 165         enum max14577_muic_charger_type chg_type;
 166 
 167         ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
 168         if (ret < 0)
 169                 goto out;
 170 
 171         reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
 172         chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
 173         if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
 174                 *val = POWER_SUPPLY_HEALTH_DEAD;
 175                 goto out;
 176         }
 177 
 178         ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 179         if (ret < 0)
 180                 goto out;
 181 
 182         if (reg_data & STATUS3_OVP_MASK) {
 183                 *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 184                 goto out;
 185         }
 186 
 187         /* Not dead, not overvoltage */
 188         *val = POWER_SUPPLY_HEALTH_GOOD;
 189 
 190 out:
 191         return ret;
 192 }
 193 
 194 /*
 195  * Always returns 1.
 196  * The max14577 chip doesn't report any status of battery presence.
 197  * Lets assume that it will always be used with some battery.
 198  */
 199 static int max14577_get_present(struct max14577_charger *chg, int *val)
 200 {
 201         *val = 1;
 202 
 203         return 0;
 204 }
 205 
 206 static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
 207                 unsigned long hours)
 208 {
 209         u8 reg_data;
 210 
 211         switch (hours) {
 212         case 5 ... 7:
 213                 reg_data = hours - 3;
 214                 break;
 215         case 0:
 216                 /* Disable */
 217                 reg_data = 0x7;
 218                 break;
 219         default:
 220                 dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
 221                                 hours);
 222                 return -EINVAL;
 223         }
 224         reg_data <<= CHGCTRL1_TCHW_SHIFT;
 225 
 226         return max14577_update_reg(chg->max14577->regmap,
 227                         MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
 228 }
 229 
 230 static int max14577_init_constant_voltage(struct max14577_charger *chg,
 231                 unsigned int uvolt)
 232 {
 233         u8 reg_data;
 234 
 235         if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
 236                         uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 237                 return -EINVAL;
 238 
 239         if (uvolt == 4200000)
 240                 reg_data = 0x0;
 241         else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
 242                 reg_data = 0x1f;
 243         else if (uvolt <= 4280000) {
 244                 unsigned int val = uvolt;
 245 
 246                 val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
 247                 val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
 248                 if (uvolt <= 4180000)
 249                         reg_data = 0x1 + val;
 250                 else
 251                         reg_data = val; /* Fix for gap between 4.18V and 4.22V */
 252         } else
 253                 return -EINVAL;
 254 
 255         reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
 256 
 257         return max14577_write_reg(chg->max14577->regmap,
 258                         MAX14577_CHG_REG_CHG_CTRL3, reg_data);
 259 }
 260 
 261 static int max14577_init_eoc(struct max14577_charger *chg,
 262                 unsigned int uamp)
 263 {
 264         unsigned int current_bits = 0xf;
 265         u8 reg_data;
 266 
 267         switch (chg->max14577->dev_type) {
 268         case MAXIM_DEVICE_TYPE_MAX77836:
 269                 if (uamp < 5000)
 270                         return -EINVAL; /* Requested current is too low */
 271 
 272                 if (uamp >= 7500 && uamp < 10000)
 273                         current_bits = 0x0;
 274                 else if (uamp <= 50000) {
 275                         /* <5000, 7499> and <10000, 50000> */
 276                         current_bits = uamp / 5000;
 277                 } else {
 278                         uamp = min(uamp, 100000U) - 50000U;
 279                         current_bits = 0xa + uamp / 10000;
 280                 }
 281                 break;
 282 
 283         case MAXIM_DEVICE_TYPE_MAX14577:
 284         default:
 285                 if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
 286                         return -EINVAL; /* Requested current is too low */
 287 
 288                 uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 289                 uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
 290                 current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
 291                 break;
 292         }
 293 
 294         reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
 295 
 296         return max14577_update_reg(chg->max14577->regmap,
 297                         MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
 298                         reg_data);
 299 }
 300 
 301 static int max14577_init_fast_charge(struct max14577_charger *chg,
 302                 unsigned int uamp)
 303 {
 304         u8 reg_data;
 305         int ret;
 306         const struct maxim_charger_current *limits =
 307                 &maxim_charger_currents[chg->max14577->dev_type];
 308 
 309         ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
 310         if (ret) {
 311                 dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
 312                 return ret;
 313         }
 314 
 315         return max14577_update_reg(chg->max14577->regmap,
 316                         MAX14577_CHG_REG_CHG_CTRL4,
 317                         CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 318                         reg_data);
 319 }
 320 
 321 /*
 322  * Sets charger registers to proper and safe default values.
 323  * Some of these values are equal to defaults in MAX14577E
 324  * data sheet but there are minor differences.
 325  */
 326 static int max14577_charger_reg_init(struct max14577_charger *chg)
 327 {
 328         struct regmap *rmap = chg->max14577->regmap;
 329         u8 reg_data;
 330         int ret;
 331 
 332         /*
 333          * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
 334          * Charger-Detection Enable, default on (set CHGDETEN to 1)
 335          * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
 336          */
 337         reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
 338         max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
 339                         CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
 340                         reg_data);
 341 
 342         /*
 343          * Wall-Adapter Rapid Charge, default on
 344          * Battery-Charger, default on
 345          */
 346         reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
 347         reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
 348         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
 349 
 350         /* Auto Charging Stop, default off */
 351         reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
 352         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
 353 
 354         ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
 355         if (ret)
 356                 return ret;
 357 
 358         ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
 359         if (ret)
 360                 return ret;
 361 
 362         ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
 363         if (ret)
 364                 return ret;
 365 
 366         ret = max14577_set_fast_charge_timer(chg,
 367                         MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
 368         if (ret)
 369                 return ret;
 370 
 371         /* Initialize Overvoltage-Protection Threshold */
 372         switch (chg->pdata->ovp_uvolt) {
 373         case 7500000:
 374                 reg_data = 0x0;
 375                 break;
 376         case 6000000:
 377         case 6500000:
 378         case 7000000:
 379                 reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
 380                 break;
 381         default:
 382                 dev_err(chg->dev, "Wrong value for OVP: %u\n",
 383                                 chg->pdata->ovp_uvolt);
 384                 return -EINVAL;
 385         }
 386         reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
 387         max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
 388 
 389         return 0;
 390 }
 391 
 392 /* Support property from charger */
 393 static enum power_supply_property max14577_charger_props[] = {
 394         POWER_SUPPLY_PROP_STATUS,
 395         POWER_SUPPLY_PROP_CHARGE_TYPE,
 396         POWER_SUPPLY_PROP_HEALTH,
 397         POWER_SUPPLY_PROP_PRESENT,
 398         POWER_SUPPLY_PROP_ONLINE,
 399         POWER_SUPPLY_PROP_MODEL_NAME,
 400         POWER_SUPPLY_PROP_MANUFACTURER,
 401 };
 402 
 403 static const char * const model_names[] = {
 404         [MAXIM_DEVICE_TYPE_UNKNOWN]     = "MAX14577-like",
 405         [MAXIM_DEVICE_TYPE_MAX14577]    = "MAX14577",
 406         [MAXIM_DEVICE_TYPE_MAX77836]    = "MAX77836",
 407 };
 408 static const char *manufacturer = "Maxim Integrated";
 409 
 410 static int max14577_charger_get_property(struct power_supply *psy,
 411                             enum power_supply_property psp,
 412                             union power_supply_propval *val)
 413 {
 414         struct max14577_charger *chg = power_supply_get_drvdata(psy);
 415         int ret = 0;
 416 
 417         switch (psp) {
 418         case POWER_SUPPLY_PROP_STATUS:
 419                 ret = max14577_get_charger_state(chg, &val->intval);
 420                 break;
 421         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 422                 ret = max14577_get_charge_type(chg, &val->intval);
 423                 break;
 424         case POWER_SUPPLY_PROP_HEALTH:
 425                 ret = max14577_get_battery_health(chg, &val->intval);
 426                 break;
 427         case POWER_SUPPLY_PROP_PRESENT:
 428                 ret = max14577_get_present(chg, &val->intval);
 429                 break;
 430         case POWER_SUPPLY_PROP_ONLINE:
 431                 ret = max14577_get_online(chg, &val->intval);
 432                 break;
 433         case POWER_SUPPLY_PROP_MODEL_NAME:
 434                 BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
 435                 val->strval = model_names[chg->max14577->dev_type];
 436                 break;
 437         case POWER_SUPPLY_PROP_MANUFACTURER:
 438                 val->strval = manufacturer;
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443 
 444         return ret;
 445 }
 446 
 447 static const struct power_supply_desc max14577_charger_desc = {
 448         .name = "max14577-charger",
 449         .type = POWER_SUPPLY_TYPE_BATTERY,
 450         .properties = max14577_charger_props,
 451         .num_properties = ARRAY_SIZE(max14577_charger_props),
 452         .get_property = max14577_charger_get_property,
 453 };
 454 
 455 #ifdef CONFIG_OF
 456 static struct max14577_charger_platform_data *max14577_charger_dt_init(
 457                 struct platform_device *pdev)
 458 {
 459         struct max14577_charger_platform_data *pdata;
 460         struct device_node *np = pdev->dev.of_node;
 461         int ret;
 462 
 463         if (!np) {
 464                 dev_err(&pdev->dev, "No charger OF node\n");
 465                 return ERR_PTR(-EINVAL);
 466         }
 467 
 468         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 469         if (!pdata)
 470                 return ERR_PTR(-ENOMEM);
 471 
 472         ret = of_property_read_u32(np, "maxim,constant-uvolt",
 473                         &pdata->constant_uvolt);
 474         if (ret) {
 475                 dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
 476                 return ERR_PTR(ret);
 477         }
 478 
 479         ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
 480                         &pdata->fast_charge_uamp);
 481         if (ret) {
 482                 dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
 483                 return ERR_PTR(ret);
 484         }
 485 
 486         ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
 487         if (ret) {
 488                 dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
 489                 return ERR_PTR(ret);
 490         }
 491 
 492         ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
 493         if (ret) {
 494                 dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
 495                 return ERR_PTR(ret);
 496         }
 497 
 498         return pdata;
 499 }
 500 #else /* CONFIG_OF */
 501 static struct max14577_charger_platform_data *max14577_charger_dt_init(
 502                 struct platform_device *pdev)
 503 {
 504         return NULL;
 505 }
 506 #endif /* CONFIG_OF */
 507 
 508 static ssize_t show_fast_charge_timer(struct device *dev,
 509                 struct device_attribute *attr, char *buf)
 510 {
 511         struct max14577_charger *chg = dev_get_drvdata(dev);
 512         u8 reg_data;
 513         int ret;
 514         unsigned int val;
 515 
 516         ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
 517                         &reg_data);
 518         if (ret)
 519                 return ret;
 520 
 521         reg_data &= CHGCTRL1_TCHW_MASK;
 522         reg_data >>= CHGCTRL1_TCHW_SHIFT;
 523         switch (reg_data) {
 524         case 0x2 ... 0x4:
 525                 val = reg_data + 3;
 526                 break;
 527         case 0x7:
 528                 val = 0;
 529                 break;
 530         default:
 531                 val = 5;
 532                 break;
 533         }
 534 
 535         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 536 }
 537 
 538 static ssize_t store_fast_charge_timer(struct device *dev,
 539                 struct device_attribute *attr, const char *buf, size_t count)
 540 {
 541         struct max14577_charger *chg = dev_get_drvdata(dev);
 542         unsigned long val;
 543         int ret;
 544 
 545         ret = kstrtoul(buf, 10, &val);
 546         if (ret)
 547                 return ret;
 548 
 549         ret = max14577_set_fast_charge_timer(chg, val);
 550         if (ret)
 551                 return ret;
 552 
 553         return count;
 554 }
 555 
 556 static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
 557                 show_fast_charge_timer, store_fast_charge_timer);
 558 
 559 static int max14577_charger_probe(struct platform_device *pdev)
 560 {
 561         struct max14577_charger *chg;
 562         struct power_supply_config psy_cfg = {};
 563         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 564         int ret;
 565 
 566         chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
 567         if (!chg)
 568                 return -ENOMEM;
 569 
 570         platform_set_drvdata(pdev, chg);
 571         chg->dev = &pdev->dev;
 572         chg->max14577 = max14577;
 573 
 574         chg->pdata = max14577_charger_dt_init(pdev);
 575         if (IS_ERR_OR_NULL(chg->pdata))
 576                 return PTR_ERR(chg->pdata);
 577 
 578         ret = max14577_charger_reg_init(chg);
 579         if (ret)
 580                 return ret;
 581 
 582         ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
 583         if (ret) {
 584                 dev_err(&pdev->dev, "failed: create sysfs entry\n");
 585                 return ret;
 586         }
 587 
 588         psy_cfg.drv_data = chg;
 589         chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
 590                                                 &psy_cfg);
 591         if (IS_ERR(chg->charger)) {
 592                 dev_err(&pdev->dev, "failed: power supply register\n");
 593                 ret = PTR_ERR(chg->charger);
 594                 goto err;
 595         }
 596 
 597         /* Check for valid values for charger */
 598         BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
 599                         MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
 600                         MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
 601         return 0;
 602 
 603 err:
 604         device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 605 
 606         return ret;
 607 }
 608 
 609 static int max14577_charger_remove(struct platform_device *pdev)
 610 {
 611         struct max14577_charger *chg = platform_get_drvdata(pdev);
 612 
 613         device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
 614         power_supply_unregister(chg->charger);
 615 
 616         return 0;
 617 }
 618 
 619 static const struct platform_device_id max14577_charger_id[] = {
 620         { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
 621         { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
 622         { }
 623 };
 624 MODULE_DEVICE_TABLE(platform, max14577_charger_id);
 625 
 626 static struct platform_driver max14577_charger_driver = {
 627         .driver = {
 628                 .name   = "max14577-charger",
 629         },
 630         .probe          = max14577_charger_probe,
 631         .remove         = max14577_charger_remove,
 632         .id_table       = max14577_charger_id,
 633 };
 634 module_platform_driver(max14577_charger_driver);
 635 
 636 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 637 MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
 638 MODULE_LICENSE("GPL");
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root/drivers/power/supply/max14577_charger.c

DEFINITIONS
