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/delay.h>
  28 #include <linux/err.h>
  29 #include <linux/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 #define MAX77686_OPMODE_SHIFT   6
  50 #define MAX77686_OPMODE_BUCK234_SHIFT   4
  51 #define MAX77686_OPMODE_MASK    0x3
  52
  53 #define MAX77686_VSEL_MASK      0x3F
  54 #define MAX77686_DVS_VSEL_MASK  0xFF
  55
  56 #define MAX77686_RAMP_RATE_MASK 0xC0
  57
  58 #define MAX77686_REGULATORS     MAX77686_REG_MAX
  59 #define MAX77686_LDOS           26
  60
  61 enum max77686_ramp_rate {
  62         RAMP_RATE_13P75MV,
  63         RAMP_RATE_27P5MV,
  64         RAMP_RATE_55MV,
  65         RAMP_RATE_NO_CTRL,      /* 100mV/us */
  66 };
  67
  68 struct max77686_data {
  69         struct regulator_dev *rdev[MAX77686_REGULATORS];
  70         unsigned int opmode[MAX77686_REGULATORS];
  71 };
  72
  73 /* Some BUCKS supports Normal[ON/OFF] mode during suspend */
  74 static int max77686_buck_set_suspend_disable(struct regulator_dev *rdev)
  75 {
  76         unsigned int val;
  77         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  78
  79         if (rdev->desc->id == MAX77686_BUCK1)
  80                 val = 0x1;
  81         else
  82                 val = 0x1 << MAX77686_OPMODE_BUCK234_SHIFT;
  83
  84         max77686->opmode[rdev->desc->id] = val;
  85         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  86                                   rdev->desc->enable_mask,
  87                                   val);
  88 }
  89
  90 /* Some LDOs supports [LPM/Normal]ON mode during suspend state */
  91 static int max77686_set_suspend_mode(struct regulator_dev *rdev,
  92                                      unsigned int mode)
  93 {
  94         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
  95         unsigned int val;
  96
  97         /* BUCK[5-9] doesn't support this feature */
  98         if (rdev->desc->id >= MAX77686_BUCK5)
  99                 return 0;
 100
 101         switch (mode) {
 102         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 103                 val = 0x2 << MAX77686_OPMODE_SHIFT;
 104                 break;
 105         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 106                 val = 0x3 << MAX77686_OPMODE_SHIFT;
 107                 break;
 108         default:
 109                 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 110                         rdev->desc->name, mode);
 111                 return -EINVAL;
 112         }
 113
 114         max77686->opmode[rdev->desc->id] = val;
 115         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 116                                   rdev->desc->enable_mask,
 117                                   val);
 118 }
 119
 120 /* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
 121 static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
 122                                      unsigned int mode)
 123 {
 124         unsigned int val;
 125         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 126
 127         switch (mode) {
 128         case REGULATOR_MODE_STANDBY:                    /* switch off */
 129                 val = 0x1 << MAX77686_OPMODE_SHIFT;
 130                 break;
 131         case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
 132                 val = 0x2 << MAX77686_OPMODE_SHIFT;
 133                 break;
 134         case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
 135                 val = 0x3 << MAX77686_OPMODE_SHIFT;
 136                 break;
 137         default:
 138                 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
 139                         rdev->desc->name, mode);
 140                 return -EINVAL;
 141         }
 142
 143         max77686->opmode[rdev->desc->id] = val;
 144         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 145                                   rdev->desc->enable_mask,
 146                                   val);
 147 }
 148
 149 static int max77686_enable(struct regulator_dev *rdev)
 150 {
 151         struct max77686_data *max77686 = rdev_get_drvdata(rdev);
 152
 153         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 154                                   rdev->desc->enable_mask,
 155                                   max77686->opmode[rdev->desc->id]);
 156 }
 157
 158 static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 159 {
 160         unsigned int ramp_value = RAMP_RATE_NO_CTRL;
 161
 162         switch (ramp_delay) {
 163         case 1 ... 13750:
 164                 ramp_value = RAMP_RATE_13P75MV;
 165                 break;
 166         case 13751 ... 27500:
 167                 ramp_value = RAMP_RATE_27P5MV;
 168                 break;
 169         case 27501 ... 55000:
 170                 ramp_value = RAMP_RATE_55MV;
 171                 break;
 172         case 55001 ... 100000:
 173                 break;
 174         default:
 175                 pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
 176                         rdev->desc->name, ramp_delay);
 177         }
 178
 179         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 180                                   MAX77686_RAMP_RATE_MASK, ramp_value << 6);
 181 }
 182
 183 static struct regulator_ops max77686_ops = {
 184         .list_voltage           = regulator_list_voltage_linear,
 185         .map_voltage            = regulator_map_voltage_linear,
 186         .is_enabled             = regulator_is_enabled_regmap,
 187         .enable                 = max77686_enable,
 188         .disable                = regulator_disable_regmap,
 189         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 190         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 191         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 192         .set_suspend_mode       = max77686_set_suspend_mode,
 193 };
 194
 195 static struct regulator_ops max77686_ldo_ops = {
 196         .list_voltage           = regulator_list_voltage_linear,
 197         .map_voltage            = regulator_map_voltage_linear,
 198         .is_enabled             = regulator_is_enabled_regmap,
 199         .enable                 = max77686_enable,
 200         .disable                = regulator_disable_regmap,
 201         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 202         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 203         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 204         .set_suspend_mode       = max77686_ldo_set_suspend_mode,
 205 };
 206
 207 static struct regulator_ops max77686_buck1_ops = {
 208         .list_voltage           = regulator_list_voltage_linear,
 209         .map_voltage            = regulator_map_voltage_linear,
 210         .is_enabled             = regulator_is_enabled_regmap,
 211         .enable                 = max77686_enable,
 212         .disable                = regulator_disable_regmap,
 213         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 214         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 215         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 216         .set_suspend_disable    = max77686_buck_set_suspend_disable,
 217 };
 218
 219 static struct regulator_ops max77686_buck_dvs_ops = {
 220         .list_voltage           = regulator_list_voltage_linear,
 221         .map_voltage            = regulator_map_voltage_linear,
 222         .is_enabled             = regulator_is_enabled_regmap,
 223         .enable                 = max77686_enable,
 224         .disable                = regulator_disable_regmap,
 225         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 226         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 227         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 228         .set_ramp_delay         = max77686_set_ramp_delay,
 229         .set_suspend_disable    = max77686_buck_set_suspend_disable,
 230 };
 231
 232 #define regulator_desc_ldo(num)         {                               \
 233         .name           = "LDO"#num,                                    \
 234         .id             = MAX77686_LDO##num,                            \
 235         .ops            = &max77686_ops,                                \
 236         .type           = REGULATOR_VOLTAGE,                            \
 237         .owner          = THIS_MODULE,                                  \
 238         .min_uV         = MAX77686_LDO_MINUV,                           \
 239         .uV_step        = MAX77686_LDO_UVSTEP,                          \
 240         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 241         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 242         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 243         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 244         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 245         .enable_mask    = MAX77686_OPMODE_MASK                          \
 246                         << MAX77686_OPMODE_SHIFT,                       \
 247 }
 248 #define regulator_desc_lpm_ldo(num)     {                               \
 249         .name           = "LDO"#num,                                    \
 250         .id             = MAX77686_LDO##num,                            \
 251         .ops            = &max77686_ldo_ops,                            \
 252         .type           = REGULATOR_VOLTAGE,                            \
 253         .owner          = THIS_MODULE,                                  \
 254         .min_uV         = MAX77686_LDO_MINUV,                           \
 255         .uV_step        = MAX77686_LDO_UVSTEP,                          \
 256         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 257         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 258         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 259         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 260         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 261         .enable_mask    = MAX77686_OPMODE_MASK                          \
 262                         << MAX77686_OPMODE_SHIFT,                       \
 263 }
 264 #define regulator_desc_ldo_low(num)             {                       \
 265         .name           = "LDO"#num,                                    \
 266         .id             = MAX77686_LDO##num,                            \
 267         .ops            = &max77686_ldo_ops,                            \
 268         .type           = REGULATOR_VOLTAGE,                            \
 269         .owner          = THIS_MODULE,                                  \
 270         .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 271         .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 272         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 273         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 274         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 275         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 276         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 277         .enable_mask    = MAX77686_OPMODE_MASK                          \
 278                         << MAX77686_OPMODE_SHIFT,                       \
 279 }
 280 #define regulator_desc_ldo1_low(num)            {                       \
 281         .name           = "LDO"#num,                                    \
 282         .id             = MAX77686_LDO##num,                            \
 283         .ops            = &max77686_ops,                                \
 284         .type           = REGULATOR_VOLTAGE,                            \
 285         .owner          = THIS_MODULE,                                  \
 286         .min_uV         = MAX77686_LDO_LOW_MINUV,                       \
 287         .uV_step        = MAX77686_LDO_LOW_UVSTEP,                      \
 288         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 289         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 290         .vsel_reg       = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 291         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 292         .enable_reg     = MAX77686_REG_LDO1CTRL1 + num - 1,             \
 293         .enable_mask    = MAX77686_OPMODE_MASK                          \
 294                         << MAX77686_OPMODE_SHIFT,                       \
 295 }
 296 #define regulator_desc_buck(num)                {                       \
 297         .name           = "BUCK"#num,                                   \
 298         .id             = MAX77686_BUCK##num,                           \
 299         .ops            = &max77686_ops,                                \
 300         .type           = REGULATOR_VOLTAGE,                            \
 301         .owner          = THIS_MODULE,                                  \
 302         .min_uV         = MAX77686_BUCK_MINUV,                          \
 303         .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 304         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 305         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 306         .vsel_reg       = MAX77686_REG_BUCK5OUT + (num - 5) * 2,        \
 307         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 308         .enable_reg     = MAX77686_REG_BUCK5CTRL + (num - 5) * 2,       \
 309         .enable_mask    = MAX77686_OPMODE_MASK,                         \
 310 }
 311 #define regulator_desc_buck1(num)               {                       \
 312         .name           = "BUCK"#num,                                   \
 313         .id             = MAX77686_BUCK##num,                           \
 314         .ops            = &max77686_buck1_ops,                          \
 315         .type           = REGULATOR_VOLTAGE,                            \
 316         .owner          = THIS_MODULE,                                  \
 317         .min_uV         = MAX77686_BUCK_MINUV,                          \
 318         .uV_step        = MAX77686_BUCK_UVSTEP,                         \
 319         .ramp_delay     = MAX77686_RAMP_DELAY,                          \
 320         .n_voltages     = MAX77686_VSEL_MASK + 1,                       \
 321         .vsel_reg       = MAX77686_REG_BUCK1OUT,                        \
 322         .vsel_mask      = MAX77686_VSEL_MASK,                           \
 323         .enable_reg     = MAX77686_REG_BUCK1CTRL,                       \
 324         .enable_mask    = MAX77686_OPMODE_MASK,                         \
 325 }
 326 #define regulator_desc_buck_dvs(num)            {                       \
 327         .name           = "BUCK"#num,                                   \
 328         .id             = MAX77686_BUCK##num,                           \
 329         .ops            = &max77686_buck_dvs_ops,                       \
 330         .type           = REGULATOR_VOLTAGE,                            \
 331         .owner          = THIS_MODULE,                                  \
 332         .min_uV         = MAX77686_DVS_MINUV,                           \
 333         .uV_step        = MAX77686_DVS_UVSTEP,                          \
 334         .ramp_delay     = MAX77686_DVS_RAMP_DELAY,                      \
 335         .n_voltages     = MAX77686_DVS_VSEL_MASK + 1,                   \
 336         .vsel_reg       = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10,      \
 337         .vsel_mask      = MAX77686_DVS_VSEL_MASK,                       \
 338         .enable_reg     = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10,     \
 339         .enable_mask    = MAX77686_OPMODE_MASK                          \
 340                         << MAX77686_OPMODE_BUCK234_SHIFT,               \
 341 }
 342
 343 static struct regulator_desc regulators[] = {
 344         regulator_desc_ldo1_low(1),
 345         regulator_desc_ldo_low(2),
 346         regulator_desc_ldo(3),
 347         regulator_desc_ldo(4),
 348         regulator_desc_ldo(5),
 349         regulator_desc_ldo_low(6),
 350         regulator_desc_ldo_low(7),
 351         regulator_desc_ldo_low(8),
 352         regulator_desc_ldo(9),
 353         regulator_desc_lpm_ldo(10),
 354         regulator_desc_lpm_ldo(11),
 355         regulator_desc_lpm_ldo(12),
 356         regulator_desc_ldo(13),
 357         regulator_desc_lpm_ldo(14),
 358         regulator_desc_ldo_low(15),
 359         regulator_desc_lpm_ldo(16),
 360         regulator_desc_ldo(17),
 361         regulator_desc_ldo(18),
 362         regulator_desc_ldo(19),
 363         regulator_desc_ldo(20),
 364         regulator_desc_ldo(21),
 365         regulator_desc_ldo(22),
 366         regulator_desc_ldo(23),
 367         regulator_desc_ldo(24),
 368         regulator_desc_ldo(25),
 369         regulator_desc_ldo(26),
 370         regulator_desc_buck1(1),
 371         regulator_desc_buck_dvs(2),
 372         regulator_desc_buck_dvs(3),
 373         regulator_desc_buck_dvs(4),
 374         regulator_desc_buck(5),
 375         regulator_desc_buck(6),
 376         regulator_desc_buck(7),
 377         regulator_desc_buck(8),
 378         regulator_desc_buck(9),
 379 };
 380
 381 #ifdef CONFIG_OF
 382 static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 383                                         struct max77686_platform_data *pdata)
 384 {
 385         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 386         struct device_node *pmic_np, *regulators_np;
 387         struct max77686_regulator_data *rdata;
 388         struct of_regulator_match rmatch;
 389         unsigned int i;
 390
 391         pmic_np = iodev->dev->of_node;
 392         regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
 393         if (!regulators_np) {
 394                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
 395                 return -EINVAL;
 396         }
 397
 398         pdata->num_regulators = ARRAY_SIZE(regulators);
 399         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
 400                              pdata->num_regulators, GFP_KERNEL);
 401         if (!rdata) {
 402                 dev_err(&pdev->dev,
 403                         "could not allocate memory for regulator data\n");
 404                 return -ENOMEM;
 405         }
 406
 407         for (i = 0; i < pdata->num_regulators; i++) {
 408                 rmatch.name = regulators[i].name;
 409                 rmatch.init_data = NULL;
 410                 rmatch.of_node = NULL;
 411                 of_regulator_match(&pdev->dev, regulators_np, &rmatch, 1);
 412                 rdata[i].initdata = rmatch.init_data;
 413                 rdata[i].of_node = rmatch.of_node;
 414         }
 415
 416         pdata->regulators = rdata;
 417
 418         return 0;
 419 }
 420 #else
 421 static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
 422                                         struct max77686_platform_data *pdata)
 423 {
 424         return 0;
 425 }
 426 #endif /* CONFIG_OF */
 427
 428 static int max77686_pmic_probe(struct platform_device *pdev)
 429 {
 430         struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 431         struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
 432         struct max77686_data *max77686;
 433         int i, ret = 0;
 434         struct regulator_config config = { };
 435
 436         dev_dbg(&pdev->dev, "%s\n", __func__);
 437
 438         if (!pdata) {
 439                 dev_err(&pdev->dev, "no platform data found for regulator\n");
 440                 return -ENODEV;
 441         }
 442
 443         if (iodev->dev->of_node) {
 444                 ret = max77686_pmic_dt_parse_pdata(pdev, pdata);
 445                 if (ret)
 446                         return ret;
 447         }
 448
 449         if (pdata->num_regulators != MAX77686_REGULATORS) {
 450                 dev_err(&pdev->dev,
 451                         "Invalid initial data for regulator's initialiation\n");
 452                 return -EINVAL;
 453         }
 454
 455         max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
 456                                 GFP_KERNEL);
 457         if (!max77686)
 458                 return -ENOMEM;
 459
 460         config.dev = &pdev->dev;
 461         config.regmap = iodev->regmap;
 462         config.driver_data = max77686;
 463         platform_set_drvdata(pdev, max77686);
 464
 465         for (i = 0; i < MAX77686_REGULATORS; i++) {
 466                 config.init_data = pdata->regulators[i].initdata;
 467                 config.of_node = pdata->regulators[i].of_node;
 468
 469                 max77686->opmode[i] = regulators[i].enable_mask;
 470                 max77686->rdev[i] = regulator_register(&regulators[i], &config);
 471                 if (IS_ERR(max77686->rdev[i])) {
 472                         ret = PTR_ERR(max77686->rdev[i]);
 473                         dev_err(&pdev->dev,
 474                                 "regulator init failed for %d\n", i);
 475                         max77686->rdev[i] = NULL;
 476                         goto err;
 477                 }
 478         }
 479
 480         return 0;
 481 err:
 482         while (--i >= 0)
 483                 regulator_unregister(max77686->rdev[i]);
 484         return ret;
 485 }
 486
 487 static int max77686_pmic_remove(struct platform_device *pdev)
 488 {
 489         struct max77686_data *max77686 = platform_get_drvdata(pdev);
 490         int i;
 491
 492         for (i = 0; i < MAX77686_REGULATORS; i++)
 493                 regulator_unregister(max77686->rdev[i]);
 494
 495         return 0;
 496 }
 497
 498 static const struct platform_device_id max77686_pmic_id[] = {
 499         {"max77686-pmic", 0},
 500         { },
 501 };
 502 MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
 503
 504 static struct platform_driver max77686_pmic_driver = {
 505         .driver = {
 506                 .name = "max77686-pmic",
 507                 .owner = THIS_MODULE,
 508         },
 509         .probe = max77686_pmic_probe,
 510         .remove = max77686_pmic_remove,
 511         .id_table = max77686_pmic_id,
 512 };
 513
 514 static int __init max77686_pmic_init(void)
 515 {
 516         return platform_driver_register(&max77686_pmic_driver);
 517 }
 518 subsys_initcall(max77686_pmic_init);
 519
 520 static void __exit max77686_pmic_cleanup(void)
 521 {
 522         platform_driver_unregister(&max77686_pmic_driver);
 523 }
 524 module_exit(max77686_pmic_cleanup);
 525
 526 MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
 527 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 528 MODULE_LICENSE("GPL");