drivers/regulator/max8998.c

   1 /*
   2  * max8998.c - Voltage regulator driver for the Maxim 8998
   3  *
   4  *  Copyright (C) 2009-2010 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *  Marek Szyprowski <m.szyprowski@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
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/i2c.h>
  26 #include <linux/err.h>
  27 #include <linux/gpio.h>
  28 #include <linux/slab.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/mutex.h>
  31 #include <linux/of.h>
  32 #include <linux/of_gpio.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/regulator/driver.h>
  35 #include <linux/regulator/of_regulator.h>
  36 #include <linux/mfd/max8998.h>
  37 #include <linux/mfd/max8998-private.h>
  38
  39 struct max8998_data {
  40         struct device           *dev;
  41         struct max8998_dev      *iodev;
  42         int                     num_regulators;
  43         u8                      buck1_vol[4]; /* voltages for selection */
  44         u8                      buck2_vol[2];
  45         unsigned int            buck1_idx; /* index to last changed voltage */
  46                                            /* value in a set */
  47         unsigned int            buck2_idx;
  48 };
  49
  50 struct voltage_map_desc {
  51         int min;
  52         int max;
  53         int step;
  54 };
  55
  56 /* Voltage maps in uV*/
  57 static const struct voltage_map_desc ldo23_voltage_map_desc = {
  58         .min = 800000,  .step = 50000,  .max = 1300000,
  59 };
  60 static const struct voltage_map_desc ldo456711_voltage_map_desc = {
  61         .min = 1600000, .step = 100000, .max = 3600000,
  62 };
  63 static const struct voltage_map_desc ldo8_voltage_map_desc = {
  64         .min = 3000000, .step = 100000, .max = 3600000,
  65 };
  66 static const struct voltage_map_desc ldo9_voltage_map_desc = {
  67         .min = 2800000, .step = 100000, .max = 3100000,
  68 };
  69 static const struct voltage_map_desc ldo10_voltage_map_desc = {
  70         .min = 950000,  .step = 50000,  .max = 1300000,
  71 };
  72 static const struct voltage_map_desc ldo1213_voltage_map_desc = {
  73         .min = 800000,  .step = 100000, .max = 3300000,
  74 };
  75 static const struct voltage_map_desc ldo1415_voltage_map_desc = {
  76         .min = 1200000, .step = 100000, .max = 3300000,
  77 };
  78 static const struct voltage_map_desc ldo1617_voltage_map_desc = {
  79         .min = 1600000, .step = 100000, .max = 3600000,
  80 };
  81 static const struct voltage_map_desc buck12_voltage_map_desc = {
  82         .min = 750000,  .step = 25000,  .max = 1525000,
  83 };
  84 static const struct voltage_map_desc buck3_voltage_map_desc = {
  85         .min = 1600000, .step = 100000, .max = 3600000,
  86 };
  87 static const struct voltage_map_desc buck4_voltage_map_desc = {
  88         .min = 800000,  .step = 100000, .max = 2300000,
  89 };
  90
  91 static const struct voltage_map_desc *ldo_voltage_map[] = {
  92         NULL,
  93         NULL,
  94         &ldo23_voltage_map_desc,        /* LDO2 */
  95         &ldo23_voltage_map_desc,        /* LDO3 */
  96         &ldo456711_voltage_map_desc,    /* LDO4 */
  97         &ldo456711_voltage_map_desc,    /* LDO5 */
  98         &ldo456711_voltage_map_desc,    /* LDO6 */
  99         &ldo456711_voltage_map_desc,    /* LDO7 */
 100         &ldo8_voltage_map_desc,         /* LDO8 */
 101         &ldo9_voltage_map_desc,         /* LDO9 */
 102         &ldo10_voltage_map_desc,        /* LDO10 */
 103         &ldo456711_voltage_map_desc,    /* LDO11 */
 104         &ldo1213_voltage_map_desc,      /* LDO12 */
 105         &ldo1213_voltage_map_desc,      /* LDO13 */
 106         &ldo1415_voltage_map_desc,      /* LDO14 */
 107         &ldo1415_voltage_map_desc,      /* LDO15 */
 108         &ldo1617_voltage_map_desc,      /* LDO16 */
 109         &ldo1617_voltage_map_desc,      /* LDO17 */
 110         &buck12_voltage_map_desc,       /* BUCK1 */
 111         &buck12_voltage_map_desc,       /* BUCK2 */
 112         &buck3_voltage_map_desc,        /* BUCK3 */
 113         &buck4_voltage_map_desc,        /* BUCK4 */
 114 };
 115
 116 static int max8998_get_enable_register(struct regulator_dev *rdev,
 117                                         int *reg, int *shift)
 118 {
 119         int ldo = rdev_get_id(rdev);
 120
 121         switch (ldo) {
 122         case MAX8998_LDO2 ... MAX8998_LDO5:
 123                 *reg = MAX8998_REG_ONOFF1;
 124                 *shift = 3 - (ldo - MAX8998_LDO2);
 125                 break;
 126         case MAX8998_LDO6 ... MAX8998_LDO13:
 127                 *reg = MAX8998_REG_ONOFF2;
 128                 *shift = 7 - (ldo - MAX8998_LDO6);
 129                 break;
 130         case MAX8998_LDO14 ... MAX8998_LDO17:
 131                 *reg = MAX8998_REG_ONOFF3;
 132                 *shift = 7 - (ldo - MAX8998_LDO14);
 133                 break;
 134         case MAX8998_BUCK1 ... MAX8998_BUCK4:
 135                 *reg = MAX8998_REG_ONOFF1;
 136                 *shift = 7 - (ldo - MAX8998_BUCK1);
 137                 break;
 138         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
 139                 *reg = MAX8998_REG_ONOFF4;
 140                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
 141                 break;
 142         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
 143                 *reg = MAX8998_REG_CHGR2;
 144                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
 145                 break;
 146         default:
 147                 return -EINVAL;
 148         }
 149
 150         return 0;
 151 }
 152
 153 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
 154 {
 155         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 156         struct i2c_client *i2c = max8998->iodev->i2c;
 157         int ret, reg, shift = 8;
 158         u8 val;
 159
 160         ret = max8998_get_enable_register(rdev, &reg, &shift);
 161         if (ret)
 162                 return ret;
 163
 164         ret = max8998_read_reg(i2c, reg, &val);
 165         if (ret)
 166                 return ret;
 167
 168         return val & (1 << shift);
 169 }
 170
 171 static int max8998_ldo_enable(struct regulator_dev *rdev)
 172 {
 173         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 174         struct i2c_client *i2c = max8998->iodev->i2c;
 175         int reg, shift = 8, ret;
 176
 177         ret = max8998_get_enable_register(rdev, &reg, &shift);
 178         if (ret)
 179                 return ret;
 180
 181         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
 182 }
 183
 184 static int max8998_ldo_disable(struct regulator_dev *rdev)
 185 {
 186         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 187         struct i2c_client *i2c = max8998->iodev->i2c;
 188         int reg, shift = 8, ret;
 189
 190         ret = max8998_get_enable_register(rdev, &reg, &shift);
 191         if (ret)
 192                 return ret;
 193
 194         return max8998_update_reg(i2c, reg, 0, 1<<shift);
 195 }
 196
 197 static int max8998_get_voltage_register(struct regulator_dev *rdev,
 198                                 int *_reg, int *_shift, int *_mask)
 199 {
 200         int ldo = rdev_get_id(rdev);
 201         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 202         int reg, shift = 0, mask = 0xff;
 203
 204         switch (ldo) {
 205         case MAX8998_LDO2 ... MAX8998_LDO3:
 206                 reg = MAX8998_REG_LDO2_LDO3;
 207                 mask = 0xf;
 208                 if (ldo == MAX8998_LDO2)
 209                         shift = 4;
 210                 else
 211                         shift = 0;
 212                 break;
 213         case MAX8998_LDO4 ... MAX8998_LDO7:
 214                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
 215                 break;
 216         case MAX8998_LDO8 ... MAX8998_LDO9:
 217                 reg = MAX8998_REG_LDO8_LDO9;
 218                 mask = 0xf;
 219                 if (ldo == MAX8998_LDO8)
 220                         shift = 4;
 221                 else
 222                         shift = 0;
 223                 break;
 224         case MAX8998_LDO10 ... MAX8998_LDO11:
 225                 reg = MAX8998_REG_LDO10_LDO11;
 226                 if (ldo == MAX8998_LDO10) {
 227                         shift = 5;
 228                         mask = 0x7;
 229                 } else {
 230                         shift = 0;
 231                         mask = 0x1f;
 232                 }
 233                 break;
 234         case MAX8998_LDO12 ... MAX8998_LDO17:
 235                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
 236                 break;
 237         case MAX8998_BUCK1:
 238                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
 239                 break;
 240         case MAX8998_BUCK2:
 241                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
 242                 break;
 243         case MAX8998_BUCK3:
 244                 reg = MAX8998_REG_BUCK3;
 245                 break;
 246         case MAX8998_BUCK4:
 247                 reg = MAX8998_REG_BUCK4;
 248                 break;
 249         default:
 250                 return -EINVAL;
 251         }
 252
 253         *_reg = reg;
 254         *_shift = shift;
 255         *_mask = mask;
 256
 257         return 0;
 258 }
 259
 260 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
 261 {
 262         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 263         struct i2c_client *i2c = max8998->iodev->i2c;
 264         int reg, shift = 0, mask, ret;
 265         u8 val;
 266
 267         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 268         if (ret)
 269                 return ret;
 270
 271         ret = max8998_read_reg(i2c, reg, &val);
 272         if (ret)
 273                 return ret;
 274
 275         val >>= shift;
 276         val &= mask;
 277
 278         return val;
 279 }
 280
 281 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
 282                                        unsigned selector)
 283 {
 284         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 285         struct i2c_client *i2c = max8998->iodev->i2c;
 286         int reg, shift = 0, mask, ret;
 287
 288         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 289         if (ret)
 290                 return ret;
 291
 292         ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
 293
 294         return ret;
 295 }
 296
 297 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
 298 {
 299         gpio_set_value(gpio1, v & 0x1);
 300         gpio_set_value(gpio2, (v >> 1) & 0x1);
 301 }
 302
 303 static inline void buck2_gpio_set(int gpio, int v)
 304 {
 305         gpio_set_value(gpio, v & 0x1);
 306 }
 307
 308 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
 309                                         unsigned selector)
 310 {
 311         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 312         struct max8998_platform_data *pdata =
 313                 dev_get_platdata(max8998->iodev->dev);
 314         struct i2c_client *i2c = max8998->iodev->i2c;
 315         int buck = rdev_get_id(rdev);
 316         int reg, shift = 0, mask, ret, j;
 317         static u8 buck1_last_val;
 318
 319         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
 320         if (ret)
 321                 return ret;
 322
 323         switch (buck) {
 324         case MAX8998_BUCK1:
 325                 dev_dbg(max8998->dev,
 326                         "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
 327                         "buck1_vol3:%d, buck1_vol4:%d\n",
 328                         selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
 329                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
 330
 331                 if (gpio_is_valid(pdata->buck1_set1) &&
 332                     gpio_is_valid(pdata->buck1_set2)) {
 333
 334                         /* check if requested voltage */
 335                         /* value is already defined */
 336                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
 337                                 if (max8998->buck1_vol[j] == selector) {
 338                                         max8998->buck1_idx = j;
 339                                         buck1_gpio_set(pdata->buck1_set1,
 340                                                        pdata->buck1_set2, j);
 341                                         goto buck1_exit;
 342                                 }
 343                         }
 344
 345                         if (pdata->buck_voltage_lock)
 346                                 return -EINVAL;
 347
 348                         /* no predefine regulator found */
 349                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
 350                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
 351                                 max8998->buck1_idx);
 352                         max8998->buck1_vol[max8998->buck1_idx] = selector;
 353                         ret = max8998_get_voltage_register(rdev, &reg,
 354                                                            &shift,
 355                                                            &mask);
 356                         ret = max8998_write_reg(i2c, reg, selector);
 357                         buck1_gpio_set(pdata->buck1_set1,
 358                                        pdata->buck1_set2, max8998->buck1_idx);
 359                         buck1_last_val++;
 360 buck1_exit:
 361                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
 362                                 i2c->name, gpio_get_value(pdata->buck1_set1),
 363                                 gpio_get_value(pdata->buck1_set2));
 364                         break;
 365                 } else {
 366                         ret = max8998_write_reg(i2c, reg, selector);
 367                 }
 368                 break;
 369
 370         case MAX8998_BUCK2:
 371                 dev_dbg(max8998->dev,
 372                         "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
 373                         selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
 374                 if (gpio_is_valid(pdata->buck2_set3)) {
 375
 376                         /* check if requested voltage */
 377                         /* value is already defined */
 378                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
 379                                 if (max8998->buck2_vol[j] == selector) {
 380                                         max8998->buck2_idx = j;
 381                                         buck2_gpio_set(pdata->buck2_set3, j);
 382                                         goto buck2_exit;
 383                                 }
 384                         }
 385
 386                         if (pdata->buck_voltage_lock)
 387                                 return -EINVAL;
 388
 389                         max8998_get_voltage_register(rdev,
 390                                         &reg, &shift, &mask);
 391                         ret = max8998_write_reg(i2c, reg, selector);
 392                         max8998->buck2_vol[max8998->buck2_idx] = selector;
 393                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
 394 buck2_exit:
 395                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
 396                                 gpio_get_value(pdata->buck2_set3));
 397                 } else {
 398                         ret = max8998_write_reg(i2c, reg, selector);
 399                 }
 400                 break;
 401
 402         case MAX8998_BUCK3:
 403         case MAX8998_BUCK4:
 404                 ret = max8998_update_reg(i2c, reg, selector<<shift,
 405                                          mask<<shift);
 406                 break;
 407         }
 408
 409         return ret;
 410 }
 411
 412 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
 413                                              unsigned int old_selector,
 414                                              unsigned int new_selector)
 415 {
 416         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
 417         struct i2c_client *i2c = max8998->iodev->i2c;
 418         const struct voltage_map_desc *desc;
 419         int buck = rdev_get_id(rdev);
 420         u8 val = 0;
 421         int difference, ret;
 422
 423         if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
 424                 return -EINVAL;
 425
 426         desc = ldo_voltage_map[buck];
 427
 428         /* Voltage stabilization */
 429         ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
 430         if (ret)
 431                 return ret;
 432
 433         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
 434         /* MAX8998 has ENRAMP bit implemented, so test it*/
 435         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
 436                 return 0;
 437
 438         difference = (new_selector - old_selector) * desc->step / 1000;
 439         if (difference > 0)
 440                 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
 441
 442         return 0;
 443 }
 444
 445 static struct regulator_ops max8998_ldo_ops = {
 446         .list_voltage           = regulator_list_voltage_linear,
 447         .map_voltage            = regulator_map_voltage_linear,
 448         .is_enabled             = max8998_ldo_is_enabled,
 449         .enable                 = max8998_ldo_enable,
 450         .disable                = max8998_ldo_disable,
 451         .get_voltage_sel        = max8998_get_voltage_sel,
 452         .set_voltage_sel        = max8998_set_voltage_ldo_sel,
 453 };
 454
 455 static struct regulator_ops max8998_buck_ops = {
 456         .list_voltage           = regulator_list_voltage_linear,
 457         .map_voltage            = regulator_map_voltage_linear,
 458         .is_enabled             = max8998_ldo_is_enabled,
 459         .enable                 = max8998_ldo_enable,
 460         .disable                = max8998_ldo_disable,
 461         .get_voltage_sel        = max8998_get_voltage_sel,
 462         .set_voltage_sel        = max8998_set_voltage_buck_sel,
 463         .set_voltage_time_sel   = max8998_set_voltage_buck_time_sel,
 464 };
 465
 466 static struct regulator_ops max8998_others_ops = {
 467         .is_enabled             = max8998_ldo_is_enabled,
 468         .enable                 = max8998_ldo_enable,
 469         .disable                = max8998_ldo_disable,
 470 };
 471
 472 static struct regulator_desc regulators[] = {
 473         {
 474                 .name           = "LDO2",
 475                 .id             = MAX8998_LDO2,
 476                 .ops            = &max8998_ldo_ops,
 477                 .type           = REGULATOR_VOLTAGE,
 478                 .owner          = THIS_MODULE,
 479         }, {
 480                 .name           = "LDO3",
 481                 .id             = MAX8998_LDO3,
 482                 .ops            = &max8998_ldo_ops,
 483                 .type           = REGULATOR_VOLTAGE,
 484                 .owner          = THIS_MODULE,
 485         }, {
 486                 .name           = "LDO4",
 487                 .id             = MAX8998_LDO4,
 488                 .ops            = &max8998_ldo_ops,
 489                 .type           = REGULATOR_VOLTAGE,
 490                 .owner          = THIS_MODULE,
 491         }, {
 492                 .name           = "LDO5",
 493                 .id             = MAX8998_LDO5,
 494                 .ops            = &max8998_ldo_ops,
 495                 .type           = REGULATOR_VOLTAGE,
 496                 .owner          = THIS_MODULE,
 497         }, {
 498                 .name           = "LDO6",
 499                 .id             = MAX8998_LDO6,
 500                 .ops            = &max8998_ldo_ops,
 501                 .type           = REGULATOR_VOLTAGE,
 502                 .owner          = THIS_MODULE,
 503         }, {
 504                 .name           = "LDO7",
 505                 .id             = MAX8998_LDO7,
 506                 .ops            = &max8998_ldo_ops,
 507                 .type           = REGULATOR_VOLTAGE,
 508                 .owner          = THIS_MODULE,
 509         }, {
 510                 .name           = "LDO8",
 511                 .id             = MAX8998_LDO8,
 512                 .ops            = &max8998_ldo_ops,
 513                 .type           = REGULATOR_VOLTAGE,
 514                 .owner          = THIS_MODULE,
 515         }, {
 516                 .name           = "LDO9",
 517                 .id             = MAX8998_LDO9,
 518                 .ops            = &max8998_ldo_ops,
 519                 .type           = REGULATOR_VOLTAGE,
 520                 .owner          = THIS_MODULE,
 521         }, {
 522                 .name           = "LDO10",
 523                 .id             = MAX8998_LDO10,
 524                 .ops            = &max8998_ldo_ops,
 525                 .type           = REGULATOR_VOLTAGE,
 526                 .owner          = THIS_MODULE,
 527         }, {
 528                 .name           = "LDO11",
 529                 .id             = MAX8998_LDO11,
 530                 .ops            = &max8998_ldo_ops,
 531                 .type           = REGULATOR_VOLTAGE,
 532                 .owner          = THIS_MODULE,
 533         }, {
 534                 .name           = "LDO12",
 535                 .id             = MAX8998_LDO12,
 536                 .ops            = &max8998_ldo_ops,
 537                 .type           = REGULATOR_VOLTAGE,
 538                 .owner          = THIS_MODULE,
 539         }, {
 540                 .name           = "LDO13",
 541                 .id             = MAX8998_LDO13,
 542                 .ops            = &max8998_ldo_ops,
 543                 .type           = REGULATOR_VOLTAGE,
 544                 .owner          = THIS_MODULE,
 545         }, {
 546                 .name           = "LDO14",
 547                 .id             = MAX8998_LDO14,
 548                 .ops            = &max8998_ldo_ops,
 549                 .type           = REGULATOR_VOLTAGE,
 550                 .owner          = THIS_MODULE,
 551         }, {
 552                 .name           = "LDO15",
 553                 .id             = MAX8998_LDO15,
 554                 .ops            = &max8998_ldo_ops,
 555                 .type           = REGULATOR_VOLTAGE,
 556                 .owner          = THIS_MODULE,
 557         }, {
 558                 .name           = "LDO16",
 559                 .id             = MAX8998_LDO16,
 560                 .ops            = &max8998_ldo_ops,
 561                 .type           = REGULATOR_VOLTAGE,
 562                 .owner          = THIS_MODULE,
 563         }, {
 564                 .name           = "LDO17",
 565                 .id             = MAX8998_LDO17,
 566                 .ops            = &max8998_ldo_ops,
 567                 .type           = REGULATOR_VOLTAGE,
 568                 .owner          = THIS_MODULE,
 569         }, {
 570                 .name           = "BUCK1",
 571                 .id             = MAX8998_BUCK1,
 572                 .ops            = &max8998_buck_ops,
 573                 .type           = REGULATOR_VOLTAGE,
 574                 .owner          = THIS_MODULE,
 575         }, {
 576                 .name           = "BUCK2",
 577                 .id             = MAX8998_BUCK2,
 578                 .ops            = &max8998_buck_ops,
 579                 .type           = REGULATOR_VOLTAGE,
 580                 .owner          = THIS_MODULE,
 581         }, {
 582                 .name           = "BUCK3",
 583                 .id             = MAX8998_BUCK3,
 584                 .ops            = &max8998_buck_ops,
 585                 .type           = REGULATOR_VOLTAGE,
 586                 .owner          = THIS_MODULE,
 587         }, {
 588                 .name           = "BUCK4",
 589                 .id             = MAX8998_BUCK4,
 590                 .ops            = &max8998_buck_ops,
 591                 .type           = REGULATOR_VOLTAGE,
 592                 .owner          = THIS_MODULE,
 593         }, {
 594                 .name           = "EN32KHz-AP",
 595                 .id             = MAX8998_EN32KHZ_AP,
 596                 .ops            = &max8998_others_ops,
 597                 .type           = REGULATOR_VOLTAGE,
 598                 .owner          = THIS_MODULE,
 599         }, {
 600                 .name           = "EN32KHz-CP",
 601                 .id             = MAX8998_EN32KHZ_CP,
 602                 .ops            = &max8998_others_ops,
 603                 .type           = REGULATOR_VOLTAGE,
 604                 .owner          = THIS_MODULE,
 605         }, {
 606                 .name           = "ENVICHG",
 607                 .id             = MAX8998_ENVICHG,
 608                 .ops            = &max8998_others_ops,
 609                 .type           = REGULATOR_VOLTAGE,
 610                 .owner          = THIS_MODULE,
 611         }, {
 612                 .name           = "ESAFEOUT1",
 613                 .id             = MAX8998_ESAFEOUT1,
 614                 .ops            = &max8998_others_ops,
 615                 .type           = REGULATOR_VOLTAGE,
 616                 .owner          = THIS_MODULE,
 617         }, {
 618                 .name           = "ESAFEOUT2",
 619                 .id             = MAX8998_ESAFEOUT2,
 620                 .ops            = &max8998_others_ops,
 621                 .type           = REGULATOR_VOLTAGE,
 622                 .owner          = THIS_MODULE,
 623         }
 624 };
 625
 626 static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
 627                         struct max8998_platform_data *pdata,
 628                         struct device_node *pmic_np)
 629 {
 630         int gpio;
 631
 632         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
 633         if (!gpio_is_valid(gpio)) {
 634                 dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
 635                 return -EINVAL;
 636         }
 637         pdata->buck1_set1 = gpio;
 638
 639         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
 640         if (!gpio_is_valid(gpio)) {
 641                 dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
 642                 return -EINVAL;
 643         }
 644         pdata->buck1_set2 = gpio;
 645
 646         gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
 647         if (!gpio_is_valid(gpio)) {
 648                 dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
 649                 return -EINVAL;
 650         }
 651         pdata->buck2_set3 = gpio;
 652
 653         return 0;
 654 }
 655
 656 static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
 657                                         struct max8998_platform_data *pdata)
 658 {
 659         struct device_node *pmic_np = iodev->dev->of_node;
 660         struct device_node *regulators_np, *reg_np;
 661         struct max8998_regulator_data *rdata;
 662         unsigned int i;
 663         int ret;
 664
 665         regulators_np = of_get_child_by_name(pmic_np, "regulators");
 666         if (!regulators_np) {
 667                 dev_err(iodev->dev, "could not find regulators sub-node\n");
 668                 return -EINVAL;
 669         }
 670
 671         /* count the number of regulators to be supported in pmic */
 672         pdata->num_regulators = of_get_child_count(regulators_np);
 673
 674         rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
 675                                 pdata->num_regulators, GFP_KERNEL);
 676         if (!rdata) {
 677                 of_node_put(regulators_np);
 678                 return -ENOMEM;
 679         }
 680
 681         pdata->regulators = rdata;
 682         for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
 683                 reg_np = of_get_child_by_name(regulators_np,
 684                                                         regulators[i].name);
 685                 if (!reg_np)
 686                         continue;
 687
 688                 rdata->id = regulators[i].id;
 689                 rdata->initdata = of_get_regulator_init_data(iodev->dev,
 690                                                              reg_np,
 691                                                              &regulators[i]);
 692                 rdata->reg_node = reg_np;
 693                 ++rdata;
 694         }
 695         pdata->num_regulators = rdata - pdata->regulators;
 696
 697         of_node_put(reg_np);
 698         of_node_put(regulators_np);
 699
 700         ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
 701         if (ret)
 702                 return -EINVAL;
 703
 704         if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
 705                 pdata->buck_voltage_lock = true;
 706
 707         ret = of_property_read_u32(pmic_np,
 708                                         "max8998,pmic-buck1-default-dvs-idx",
 709                                         &pdata->buck1_default_idx);
 710         if (!ret && pdata->buck1_default_idx >= 4) {
 711                 pdata->buck1_default_idx = 0;
 712                 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 713         }
 714
 715         ret = of_property_read_u32(pmic_np,
 716                                         "max8998,pmic-buck2-default-dvs-idx",
 717                                         &pdata->buck2_default_idx);
 718         if (!ret && pdata->buck2_default_idx >= 2) {
 719                 pdata->buck2_default_idx = 0;
 720                 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
 721         }
 722
 723         ret = of_property_read_u32_array(pmic_np,
 724                                         "max8998,pmic-buck1-dvs-voltage",
 725                                         pdata->buck1_voltage,
 726                                         ARRAY_SIZE(pdata->buck1_voltage));
 727         if (ret) {
 728                 dev_err(iodev->dev, "buck1 voltages not specified\n");
 729                 return -EINVAL;
 730         }
 731
 732         ret = of_property_read_u32_array(pmic_np,
 733                                         "max8998,pmic-buck2-dvs-voltage",
 734                                         pdata->buck2_voltage,
 735                                         ARRAY_SIZE(pdata->buck2_voltage));
 736         if (ret) {
 737                 dev_err(iodev->dev, "buck2 voltages not specified\n");
 738                 return -EINVAL;
 739         }
 740
 741         return 0;
 742 }
 743
 744 static int max8998_pmic_probe(struct platform_device *pdev)
 745 {
 746         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 747         struct max8998_platform_data *pdata = iodev->pdata;
 748         struct regulator_config config = { };
 749         struct regulator_dev *rdev;
 750         struct max8998_data *max8998;
 751         struct i2c_client *i2c;
 752         int i, ret;
 753         unsigned int v;
 754
 755         if (!pdata) {
 756                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
 757                 return -ENODEV;
 758         }
 759
 760         if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
 761                 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
 762                 if (ret)
 763                         return ret;
 764         }
 765
 766         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
 767                                GFP_KERNEL);
 768         if (!max8998)
 769                 return -ENOMEM;
 770
 771         max8998->dev = &pdev->dev;
 772         max8998->iodev = iodev;
 773         max8998->num_regulators = pdata->num_regulators;
 774         platform_set_drvdata(pdev, max8998);
 775         i2c = max8998->iodev->i2c;
 776
 777         max8998->buck1_idx = pdata->buck1_default_idx;
 778         max8998->buck2_idx = pdata->buck2_default_idx;
 779
 780         /* NOTE: */
 781         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
 782         /* will be displayed */
 783
 784         /* Check if MAX8998 voltage selection GPIOs are defined */
 785         if (gpio_is_valid(pdata->buck1_set1) &&
 786             gpio_is_valid(pdata->buck1_set2)) {
 787                 /* Check if SET1 is not equal to 0 */
 788                 if (!pdata->buck1_set1) {
 789                         dev_err(&pdev->dev,
 790                                 "MAX8998 SET1 GPIO defined as 0 !\n");
 791                         WARN_ON(!pdata->buck1_set1);
 792                         return -EIO;
 793                 }
 794                 /* Check if SET2 is not equal to 0 */
 795                 if (!pdata->buck1_set2) {
 796                         dev_err(&pdev->dev,
 797                                 "MAX8998 SET2 GPIO defined as 0 !\n");
 798                         WARN_ON(!pdata->buck1_set2);
 799                         return -EIO;
 800                 }
 801
 802                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
 803                 gpio_direction_output(pdata->buck1_set1,
 804                                       max8998->buck1_idx & 0x1);
 805
 806
 807                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
 808                 gpio_direction_output(pdata->buck1_set2,
 809                                       (max8998->buck1_idx >> 1) & 0x1);
 810
 811                 /* Set predefined values for BUCK1 registers */
 812                 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
 813                         i = 0;
 814                         while (buck12_voltage_map_desc.min +
 815                                buck12_voltage_map_desc.step*i
 816                                < pdata->buck1_voltage[v])
 817                                 i++;
 818
 819                         max8998->buck1_vol[v] = i;
 820                         ret = max8998_write_reg(i2c,
 821                                         MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
 822                         if (ret)
 823                                 return ret;
 824                 }
 825         }
 826
 827         if (gpio_is_valid(pdata->buck2_set3)) {
 828                 /* Check if SET3 is not equal to 0 */
 829                 if (!pdata->buck2_set3) {
 830                         dev_err(&pdev->dev,
 831                                 "MAX8998 SET3 GPIO defined as 0 !\n");
 832                         WARN_ON(!pdata->buck2_set3);
 833                         return -EIO;
 834                 }
 835                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
 836                 gpio_direction_output(pdata->buck2_set3,
 837                                       max8998->buck2_idx & 0x1);
 838
 839                 /* Set predefined values for BUCK2 registers */
 840                 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
 841                         i = 0;
 842                         while (buck12_voltage_map_desc.min +
 843                                buck12_voltage_map_desc.step*i
 844                                < pdata->buck2_voltage[v])
 845                                 i++;
 846
 847                         max8998->buck2_vol[v] = i;
 848                         ret = max8998_write_reg(i2c,
 849                                         MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
 850                         if (ret)
 851                                 return ret;
 852                 }
 853         }
 854
 855         for (i = 0; i < pdata->num_regulators; i++) {
 856                 const struct voltage_map_desc *desc;
 857                 int id = pdata->regulators[i].id;
 858                 int index = id - MAX8998_LDO2;
 859
 860                 desc = ldo_voltage_map[id];
 861                 if (desc && regulators[index].ops != &max8998_others_ops) {
 862                         int count = (desc->max - desc->min) / desc->step + 1;
 863
 864                         regulators[index].n_voltages = count;
 865                         regulators[index].min_uV = desc->min;
 866                         regulators[index].uV_step = desc->step;
 867                 }
 868
 869                 config.dev = max8998->dev;
 870                 config.of_node = pdata->regulators[i].reg_node;
 871                 config.init_data = pdata->regulators[i].initdata;
 872                 config.driver_data = max8998;
 873
 874                 rdev = devm_regulator_register(&pdev->dev, &regulators[index],
 875                                                &config);
 876                 if (IS_ERR(rdev)) {
 877                         ret = PTR_ERR(rdev);
 878                         dev_err(max8998->dev, "regulator %s init failed (%d)\n",
 879                                                 regulators[index].name, ret);
 880                         return ret;
 881                 }
 882         }
 883
 884
 885         return 0;
 886 }
 887
 888 static const struct platform_device_id max8998_pmic_id[] = {
 889         { "max8998-pmic", TYPE_MAX8998 },
 890         { "lp3974-pmic", TYPE_LP3974 },
 891         { }
 892 };
 893 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
 894
 895 static struct platform_driver max8998_pmic_driver = {
 896         .driver = {
 897                 .name = "max8998-pmic",
 898         },
 899         .probe = max8998_pmic_probe,
 900         .id_table = max8998_pmic_id,
 901 };
 902
 903 static int __init max8998_pmic_init(void)
 904 {
 905         return platform_driver_register(&max8998_pmic_driver);
 906 }
 907 subsys_initcall(max8998_pmic_init);
 908
 909 static void __exit max8998_pmic_cleanup(void)
 910 {
 911         platform_driver_unregister(&max8998_pmic_driver);
 912 }
 913 module_exit(max8998_pmic_cleanup);
 914
 915 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
 916 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 917 MODULE_LICENSE("GPL");