drivers/regulator/max77686.c

   1 /*
   2  * max77686.c - Regulator driver for the Maxim 77686
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * Chiwoong Byun <woong.byun@smasung.com>
   6  * Jonghwa Lee <jonghwa3.lee@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  * This driver is based on max8997.c
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/bug.h>
  27 #include <linux/err.h>
  28 #include <linux/gpio.h>
  29 #include <linux/of_gpio.h>
  30 #include <linux/slab.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/regulator/driver.h>
  33 #include <linux/regulator/machine.h>
  34 #include <linux/regulator/of_regulator.h>
  35 #include <linux/mfd/max77686.h>
  36 #include <linux/mfd/max77686-private.h>
  37
  38 #define MAX77686_LDO_MINUV      800000
  39 #define MAX77686_LDO_UVSTEP     50000
  40 #define MAX77686_LDO_LOW_MINUV  800000
  41 #define MAX77686_LDO_LOW_UVSTEP 25000
  42 #define MAX77686_BUCK_MINUV     750000
  43 #define MAX77686_BUCK_UVSTEP    50000
  44 #define MAX77686_RAMP_DELAY     100000                  /* uV/us */
  45 #define MAX77686_DVS_RAMP_DELAY 27500                   /* uV/us */
  46 #define MAX77686_DVS_MINUV      600000
  47 #define MAX77686_DVS_UVSTEP     12500
  48
  49 /*
  50  * Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
  51  * It is the same as 'off' for other regulators.
  52  */
  53 #define MAX77686_GPIO_CONTROL           0x0
  54 /*
  55  * Values used for configuring LDOs and bucks.
  56  * Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
  57  */
  58 #define MAX77686_LDO_LOWPOWER           0x1
  59 /*
  60  * On/off controlled by PWRREQ:
  61  *  - LDO2, 6-8, 10-12, 14-16
  62  *  - buck[1234]
  63  */
  64 #define MAX77686_OFF_PWRREQ             0x1
  65 /* Low power mode controlled by PWRREQ: All LDOs */
  66 #define MAX77686_LDO_LOWPOWER_PWRREQ    0x2
  67 /* Forcing low power mode: buck[234] */
  68 #define MAX77686_BUCK_LOWPOWER          0x2
  69 #define MAX77686_NORMAL                 0x3
  70
  71 #define MAX77686_OPMODE_SHIFT   6
  72 #define MAX77686_OPMODE_BUCK234_SHIFT   4
  73 #define MAX77686_OPMODE_MASK    0x3
  74
  75 #define MAX77686_VSEL_MASK      0x3F
  76 #define MAX77686_DVS_VSEL_MASK  0xFF
  77
  78 #define MAX77686_RAMP_RATE_MASK 0xC0
  79
  80 #define MAX77686_REGULATORS     MAX77686_REG_MAX
  81 #define MAX77686_LDOS           26
  82
  83 enum max77686_ramp_rate {
  84         RAMP_RATE_13P75MV,
  85         RAMP_RATE_27P5MV,
  86         RAMP_RATE_55MV,
  87         RAMP_RATE_NO_CTRL,      /* 100mV/us */
  88 };
  89
  90 struct max77686_data {
  91         u64 gpio_enabled:MAX77686_REGULATORS;
  92
  93         /* Array indexed by regulator id */
  94         unsigned int opmode[MAX77686_REGULATORS];
  95 };
  96
  97 static unsigned int max77686_get_opmode_shift(int id)
  98 {
  99         switch (id) {
 100         case MAX77686_BUCK1:
 101         case MAX77686_BUCK5 ... MAX77686_BUCK9:
 102                 return 0;
 103         case MAX77686_BUCK2 ... MAX77686_BUCK4:
 104                 return MAX77686_OPMODE_BUCK234_SHIFT;
 105         default:
 106                 /* all LDOs */
 107                 return MAX77686_OPMODE_SHIFT;
 108         }
 109 }
 110
 111 /*
 112  * When regulator is configured for GPIO control then it
 113  * replaces "normal" mode. Any change from low power mode to normal
 114  * should actually change to GPIO control.
 115  * Map normal mode to proper value for such regulators.
 116  */
 117 static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
 118                                              int id)
 119 {
 120         switch (id) {
 121         case MAX77686_BUCK8:
 122         case MAX77686_BUCK9:
 123         case MAX77686_LDO20 ... MAX77686_LDO22:
 124                 if (max77686->gpio_enabled & (1 << id))
 125                         return MAX77686_GPIO_CONTROL;
 126         }
 127
 128         return MAX77686_NORMAL;
 129 }
 130
 131 /* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
 132 static int max77686_set_suspend_disable(struct regulator_dev *rdev)
 133 {
 134         unsigned int val, shift;
 135         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 136         int ret, id = rdev_get_id(rdev);
 137
 138         shift = max77686_get_opmode_shift(id);
 139         val = MAX77686_OFF_PWRREQ;
 140
 141         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 142                                  rdev->desc->enable_mask, val << shift);
 143         if (ret)
 144                 return ret;
 145
 146         max77686->opmode[id] = val;
 147         return 0;
 148 }
 149
 150 /* Some LDOs supports [LPM/Normal]ON mode during suspend state */
 151 static int max77686_set_suspend_mode(struct regulator_dev *rdev,
 152                                      unsigned int mode)
 153 {
 154         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 155         unsigned int val;
 156         int ret, id = rdev_get_id(rdev);
 157
 158         /* BUCK[5-9] doesn't support this feature */
 159         if (id >= MAX77686_BUCK5)
 160                 return 0;
 161
 162         switch (mode) {
 163         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 164                 val = MAX77686_LDO_LOWPOWER_PWRREQ;
 165                 break;
 166         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 167                 val = max77686_map_normal_mode(max77686, id);
 168                 break;
 169         default:
 170                 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 171                         rdev->desc->name, mode);
 172                 return -EINVAL;
 173         }
 174
 175         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 176                                   rdev->desc->enable_mask,
 177                                   val << MAX77686_OPMODE_SHIFT);
 178         if (ret)
 179                 return ret;
 180
 181         max77686->opmode[id] = val;
 182         return 0;
 183 }
 184
 185 /* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 186 static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 187                                      unsigned int mode)
 188 {
 189         unsigned int val;
 190         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 191         int ret, id = rdev_get_id(rdev);
 192
 193         switch (mode) {
 194         case REGULATOR_MODE_STANDBY:                    /* switch off */
 195                 val = MAX77686_OFF_PWRREQ;
 196                 break;
 197         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 198                 val = MAX77686_LDO_LOWPOWER_PWRREQ;
 199                 break;
 200         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 201                 val = max77686_map_normal_mode(max77686, id);
 202                 break;
 203         default:
 204                 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 205                         rdev->desc->name, mode);
 206                 return -EINVAL;
 207         }
 208
 209         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 210                                  rdev->desc->enable_mask,
 211                                  val << MAX77686_OPMODE_SHIFT);
 212         if (ret)
 213                 return ret;
 214
 215         max77686->opmode[id] = val;
 216         return 0;
 217 }
 218
 219 static int max77686_enable(struct regulator_dev *rdev)
 220 {
 221         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 222         unsigned int shift;
 223         int id = rdev_get_id(rdev);
 224
 225         shift = max77686_get_opmode_shift(id);
 226
 227         if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
 228                 max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
 229
 230         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 231                                   rdev->desc->enable_mask,
 232                                   max77686->opmode[id] << shift);
 233 }
 234
 235 static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 236 {
 237         unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 238
 239         switch (ramp_delay) {
 240         case 1 ... 13750:
 241                 ramp_value = RAMP_RATE_13P75MV;
 242                 break;
 243         case 13751 ... 27500:
 244                 ramp_value = RAMP_RATE_27P5MV;
 245                 break;
 246         case 27501 ... 55000:
 247                 ramp_value = RAMP_RATE_55MV;
 248                 break;
 249         case 55001 ... 100000:
 250                 break;
 251         default:
 252                 pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 253                         rdev->desc->name, ramp_delay);
 254         }
 255
 256         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 257                                   MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 258 }
 259
 260 static int max77686_of_parse_cb(struct device_node *np,
 261                 const struct regulator_desc *desc,
 262                 struct regulator_config *config)
 263 {
 264         struct max77686_data *max77686 = config->driver_data;
 265
 266         switch (desc->id) {
 267         case MAX77686_BUCK8:
 268         case MAX77686_BUCK9:
 269         case MAX77686_LDO20 ... MAX77686_LDO22:
 270                 config->ena_gpio = of_get_named_gpio(np,
 271                                         "maxim,ena-gpios", 0);
 272                 config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 273                 config->ena_gpio_initialized = true;
 274                 break;
 275         default:
 276                 return 0;
 277         }
 278
 279         if (gpio_is_valid(config->ena_gpio)) {
 280                 max77686->gpio_enabled |= (1 << desc->id);
 281
 282                 return regmap_update_bits(config->regmap, desc->enable_reg,
 283                                           desc->enable_mask,
 284                                           MAX77686_GPIO_CONTROL);
 285         }
 286
 287         return 0;
 288 }
 289
 290 static struct regulator_ops max77686_ops = {
 291         .list_voltage           = regulator_list_voltage_linear,
 292         .map_voltage            = regulator_map_voltage_linear,
 293         .is_enabled             = regulator_is_enabled_regmap,
 294         .enable                 = max77686_enable,
 295         .disable                = regulator_disable_regmap,
 296         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 297         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 298         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 299         .set_suspend_mode       = max77686_set_suspend_mode,
 300 };
 301
 302 static struct regulator_ops max77686_ldo_ops = {
 303         .list_voltage           = regulator_list_voltage_linear,
 304         .map_voltage            = regulator_map_voltage_linear,
 305         .is_enabled             = regulator_is_enabled_regmap,
 306         .enable                 = max77686_enable,
 307         .disable                = regulator_disable_regmap,
 308         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 309         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 310         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 311         .set_suspend_mode       = max77686_ldo_set_suspend_mode,
 312         .set_suspend_disable    = max77686_set_suspend_disable,
 313 };
 314
 315 static struct regulator_ops max77686_buck1_ops = {
 316         .list_voltage           = regulator_list_voltage_linear,
 317         .map_voltage            = regulator_map_voltage_linear,
 318         .is_enabled             = regulator_is_enabled_regmap,
 319         .enable                 = max77686_enable,
 320         .disable                = regulator_disable_regmap,
 321         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 322         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 323         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 324         .set_suspend_disable    = max77686_set_suspend_disable,
 325 };
 326
 327 static struct regulator_ops max77686_buck_dvs_ops = {
 328         .list_voltage           = regulator_list_voltage_linear,
 329         .map_voltage            = regulator_map_voltage_linear,
 330         .is_enabled             = regulator_is_enabled_regmap,
 331         .enable                 = max77686_enable,
 332         .disable                = regulator_disable_regmap,
 333         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 334         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 335         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 336         .set_ramp_delay         = max77686_set_ramp_delay,
 337         .set_suspend_disable    = max77686_set_suspend_disable,
 338 };
 339
 340 #define regulator_desc_ldo(num)         {                               \
 341         .name           = "LDO"#num,                                    \
 342         .of_match       = of_match_ptr("LDO"#num),                      \
 343         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 344         .of_parse_cb    = max77686_of_parse_cb,                         \
 345         .id             = MAX77686_LDO##num,                            \
 346         .ops            = &max77686_ops,                                \
 347         .type           = REGULATOR_VOLTAGE,                            \
 348         .owner          = THIS_MODULE,                                  \
 349         .min_uV         = MAX77686_LDO_MINUV,                           \
 350         .uV_step        = MAX77686_LDO_UVSTEP,                          \
 351         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 352         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 353         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 354         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 355         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 356         .enable_mask    = MAX77686_OPMODE_MASK                          \
 357                         << MAX77686_OPMODE_SHIFT,                       \
 358 }
 359 #define regulator_desc_lpm_ldo(num)     {                               \
 360         .name           = "LDO"#num,                                    \
 361         .of_match       = of_match_ptr("LDO"#num),                      \
 362         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 363         .id             = MAX77686_LDO##num,                            \
 364         .ops            = &max77686_ldo_ops,                            \
 365         .type           = REGULATOR_VOLTAGE,                            \
 366         .owner          = THIS_MODULE,                                  \
 367         .min_uV         = MAX77686_LDO_MINUV,                           \
 368         .uV_step        = MAX77686_LDO_UVSTEP,                          \
 369         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 370         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 371         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 372         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 373         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 374         .enable_mask    = MAX77686_OPMODE_MASK                          \
 375                         << MAX77686_OPMODE_SHIFT,                       \
 376 }
 377 #define regulator_desc_ldo_low(num)             {                       \
 378         .name           = "LDO"#num,                                    \
 379         .of_match       = of_match_ptr("LDO"#num),                      \
 380         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 381         .id             = MAX77686_LDO##num,                            \
 382         .ops            = &max77686_ldo_ops,                            \
 383         .type           = REGULATOR_VOLTAGE,                            \
 384         .owner          = THIS_MODULE,                                  \
 385         .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 386         .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 387         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 388         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 389         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 390         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 391         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 392         .enable_mask    = MAX77686_OPMODE_MASK                          \
 393                         << MAX77686_OPMODE_SHIFT,                       \
 394 }
 395 #define regulator_desc_ldo1_low(num)            {                       \
 396         .name           = "LDO"#num,                                    \
 397         .of_match       = of_match_ptr("LDO"#num),                      \
 398         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 399         .id             = MAX77686_LDO##num,                            \
 400         .ops            = &max77686_ops,                                \
 401         .type           = REGULATOR_VOLTAGE,                            \
 402         .owner          = THIS_MODULE,                                  \
 403         .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 404         .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 405         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 406         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 407         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 408         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 409         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 410         .enable_mask    = MAX77686_OPMODE_MASK                          \
 411                         << MAX77686_OPMODE_SHIFT,                       \
 412 }
 413 #define regulator_desc_buck(num)                {                       \
 414         .name           = "BUCK"#num,                                   \
 415         .of_match       = of_match_ptr("BUCK"#num),                     \
 416         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 417         .of_parse_cb    = max77686_of_parse_cb,                         \
 418         .id             = MAX77686_BUCK##num,                           \
 419         .ops            = &max77686_ops,                                \
 420         .type           = REGULATOR_VOLTAGE,                            \
 421         .owner          = THIS_MODULE,                                  \
 422         .min_uV         = MAX77686_BUCK_MINUV,                          \
 423         .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 424         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 425         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 426         .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 427         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 428         .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 429         .enable_mask    = MAX77686_OPMODE_MASK,                         \
 430 }
 431 #define regulator_desc_buck1(num)               {                       \
 432         .name           = "BUCK"#num,                                   \
 433         .of_match       = of_match_ptr("BUCK"#num),                     \
 434         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 435         .id             = MAX77686_BUCK##num,                           \
 436         .ops            = &max77686_buck1_ops,                          \
 437         .type           = REGULATOR_VOLTAGE,                            \
 438         .owner          = THIS_MODULE,                                  \
 439         .min_uV         = MAX77686_BUCK_MINUV,                          \
 440         .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 441         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 442         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 443         .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 444         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 445         .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 446         .enable_mask    = MAX77686_OPMODE_MASK,                         \
 447 }
 448 #define regulator_desc_buck_dvs(num)            {                       \
 449         .name           = "BUCK"#num,                                   \
 450         .of_match       = of_match_ptr("BUCK"#num),                     \
 451         .regulators_node        = of_match_ptr("voltage-regulators"),   \
 452         .id             = MAX77686_BUCK##num,                           \
 453         .ops            = &max77686_buck_dvs_ops,                       \
 454         .type           = REGULATOR_VOLTAGE,                            \
 455         .owner          = THIS_MODULE,                                  \
 456         .min_uV         = MAX77686_DVS_MINUV,                           \
 457         .uV_step        = MAX77686_DVS_UVSTEP,                          \
 458         .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 459         .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 460         .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 461         .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 462         .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 463         .enable_mask    = MAX77686_OPMODE_MASK                          \
 464                         << MAX77686_OPMODE_BUCK234_SHIFT,               \
 465 }
 466
 467 static const struct regulator_desc regulators[] = {
 468         regulator_desc_ldo1_low(1),
 469         regulator_desc_ldo_low(2),
 470         regulator_desc_ldo(3),
 471         regulator_desc_ldo(4),
 472         regulator_desc_ldo(5),
 473         regulator_desc_ldo_low(6),
 474         regulator_desc_ldo_low(7),
 475         regulator_desc_ldo_low(8),
 476         regulator_desc_ldo(9),
 477         regulator_desc_lpm_ldo(10),
 478         regulator_desc_lpm_ldo(11),
 479         regulator_desc_lpm_ldo(12),
 480         regulator_desc_ldo(13),
 481         regulator_desc_lpm_ldo(14),
 482         regulator_desc_ldo_low(15),
 483         regulator_desc_lpm_ldo(16),
 484         regulator_desc_ldo(17),
 485         regulator_desc_ldo(18),
 486         regulator_desc_ldo(19),
 487         regulator_desc_ldo(20),
 488         regulator_desc_ldo(21),
 489         regulator_desc_ldo(22),
 490         regulator_desc_ldo(23),
 491         regulator_desc_ldo(24),
 492         regulator_desc_ldo(25),
 493         regulator_desc_ldo(26),
 494         regulator_desc_buck1(1),
 495         regulator_desc_buck_dvs(2),
 496         regulator_desc_buck_dvs(3),
 497         regulator_desc_buck_dvs(4),
 498         regulator_desc_buck(5),
 499         regulator_desc_buck(6),
 500         regulator_desc_buck(7),
 501         regulator_desc_buck(8),
 502         regulator_desc_buck(9),
 503 };
 504
 505 static int max77686_pmic_probe(struct platform_device *pdev)
 506 {
 507         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 508         struct max77686_data *max77686;
 509         int i;
 510         struct regulator_config config = { };
 511
 512         dev_dbg(&pdev->dev, "%s\n", __func__);
 513
 514         max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 515                                 GFP_KERNEL);
 516         if (!max77686)
 517                 return -ENOMEM;
 518
 519         config.dev = iodev->dev;
 520         config.regmap = iodev->regmap;
 521         config.driver_data = max77686;
 522         platform_set_drvdata(pdev, max77686);
 523
 524         for (i = 0; i < MAX77686_REGULATORS; i++) {
 525                 struct regulator_dev *rdev;
 526                 int id = regulators[i].id;
 527
 528                 max77686->opmode[id] = MAX77686_NORMAL;
 529                 rdev = devm_regulator_register(&pdev->dev,
 530                                                 &regulators[i], &config);
 531                 if (IS_ERR(rdev)) {
 532                         int ret = PTR_ERR(rdev);
 533                         dev_err(&pdev->dev,
 534                                 "regulator init failed for %d: %d\n", i, ret);
 535                         return ret;
 536                 }
 537         }
 538
 539         return 0;
 540 }
 541
 542 static const struct platform_device_id max77686_pmic_id[] = {
 543         {"max77686-pmic", 0},
 544         { },
 545 };
 546 MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 547
 548 static struct platform_driver max77686_pmic_driver = {
 549         .driver = {
 550                 .name = "max77686-pmic",
 551         },
 552         .probe = max77686_pmic_probe,
 553         .id_table = max77686_pmic_id,
 554 };
 555
 556 static int __init max77686_pmic_init(void)
 557 {
 558         return platform_driver_register(&max77686_pmic_driver);
 559 }
 560 subsys_initcall(max77686_pmic_init);
 561
 562 static void __exit max77686_pmic_cleanup(void)
 563 {
 564         platform_driver_unregister(&max77686_pmic_driver);
 565 }
 566 module_exit(max77686_pmic_cleanup);
 567
 568 MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 569 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 570 MODULE_LICENSE("GPL");