drivers/regulator/max8907-regulator.c

   1 /*
   2  * max8907-regulator.c -- support regulators in max8907
   3  *
   4  * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
   5  * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
   6  *
   7  * Portions based on drivers/regulator/tps65910-regulator.c,
   8  *     Copyright 2010 Texas Instruments Inc.
   9  *     Author: Graeme Gregory <gg@slimlogic.co.uk>
  10  *     Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/mfd/core.h>
  20 #include <linux/mfd/max8907.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/regulator/driver.h>
  25 #include <linux/regulator/machine.h>
  26 #include <linux/regulator/of_regulator.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29
  30 #define MAX8907_II2RR_VERSION_MASK      0xF0
  31 #define MAX8907_II2RR_VERSION_REV_A     0x00
  32 #define MAX8907_II2RR_VERSION_REV_B     0x10
  33 #define MAX8907_II2RR_VERSION_REV_C     0x30
  34
  35 struct max8907_regulator {
  36         struct regulator_desc desc[MAX8907_NUM_REGULATORS];
  37         struct regulator_dev *rdev[MAX8907_NUM_REGULATORS];
  38 };
  39
  40 #define REG_MBATT() \
  41         [MAX8907_MBATT] = { \
  42                 .name = "MBATT", \
  43                 .supply_name = "mbatt", \
  44                 .id = MAX8907_MBATT, \
  45                 .ops = &max8907_mbatt_ops, \
  46                 .type = REGULATOR_VOLTAGE, \
  47                 .owner = THIS_MODULE, \
  48         }
  49
  50 #define REG_LDO(ids, supply, base, min, max, step) \
  51         [MAX8907_##ids] = { \
  52                 .name = #ids, \
  53                 .supply_name = supply, \
  54                 .id = MAX8907_##ids, \
  55                 .n_voltages = ((max) - (min)) / (step) + 1, \
  56                 .ops = &max8907_ldo_ops, \
  57                 .type = REGULATOR_VOLTAGE, \
  58                 .owner = THIS_MODULE, \
  59                 .min_uV = (min), \
  60                 .uV_step = (step), \
  61                 .vsel_reg = (base) + MAX8907_VOUT, \
  62                 .vsel_mask = 0x3f, \
  63                 .enable_reg = (base) + MAX8907_CTL, \
  64                 .enable_mask = MAX8907_MASK_LDO_EN, \
  65         }
  66
  67 #define REG_FIXED(ids, supply, voltage) \
  68         [MAX8907_##ids] = { \
  69                 .name = #ids, \
  70                 .supply_name = supply, \
  71                 .id = MAX8907_##ids, \
  72                 .n_voltages = 1, \
  73                 .ops = &max8907_fixed_ops, \
  74                 .type = REGULATOR_VOLTAGE, \
  75                 .owner = THIS_MODULE, \
  76                 .min_uV = (voltage), \
  77         }
  78
  79 #define REG_OUT5V(ids, supply, base, voltage) \
  80         [MAX8907_##ids] = { \
  81                 .name = #ids, \
  82                 .supply_name = supply, \
  83                 .id = MAX8907_##ids, \
  84                 .n_voltages = 1, \
  85                 .ops = &max8907_out5v_ops, \
  86                 .type = REGULATOR_VOLTAGE, \
  87                 .owner = THIS_MODULE, \
  88                 .min_uV = (voltage), \
  89                 .enable_reg = (base), \
  90                 .enable_mask = MAX8907_MASK_OUT5V_EN, \
  91         }
  92
  93 #define REG_BBAT(ids, supply, base, min, max, step) \
  94         [MAX8907_##ids] = { \
  95                 .name = #ids, \
  96                 .supply_name = supply, \
  97                 .id = MAX8907_##ids, \
  98                 .n_voltages = ((max) - (min)) / (step) + 1, \
  99                 .ops = &max8907_bbat_ops, \
 100                 .type = REGULATOR_VOLTAGE, \
 101                 .owner = THIS_MODULE, \
 102                 .min_uV = (min), \
 103                 .uV_step = (step), \
 104                 .vsel_reg = (base), \
 105                 .vsel_mask = MAX8907_MASK_VBBATTCV, \
 106         }
 107
 108 #define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
 109                         750000, 3900000, 50000)
 110 #define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
 111                         650000, 2225000, 25000)
 112
 113 static struct regulator_ops max8907_mbatt_ops = {
 114 };
 115
 116 static struct regulator_ops max8907_ldo_ops = {
 117         .list_voltage = regulator_list_voltage_linear,
 118         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 119         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 120         .enable = regulator_enable_regmap,
 121         .disable = regulator_disable_regmap,
 122         .is_enabled = regulator_is_enabled_regmap,
 123 };
 124
 125 static struct regulator_ops max8907_ldo_hwctl_ops = {
 126         .list_voltage = regulator_list_voltage_linear,
 127         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 128         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 129 };
 130
 131 static struct regulator_ops max8907_fixed_ops = {
 132         .list_voltage = regulator_list_voltage_linear,
 133 };
 134
 135 static struct regulator_ops max8907_out5v_ops = {
 136         .list_voltage = regulator_list_voltage_linear,
 137         .enable = regulator_enable_regmap,
 138         .disable = regulator_disable_regmap,
 139         .is_enabled = regulator_is_enabled_regmap,
 140 };
 141
 142 static struct regulator_ops max8907_out5v_hwctl_ops = {
 143         .list_voltage = regulator_list_voltage_linear,
 144 };
 145
 146 static struct regulator_ops max8907_bbat_ops = {
 147         .list_voltage = regulator_list_voltage_linear,
 148         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 149         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 150 };
 151
 152 static struct regulator_desc max8907_regulators[] = {
 153         REG_MBATT(),
 154         REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
 155         REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
 156         REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
 157         LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
 158         LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
 159         LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
 160         LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
 161         LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
 162         LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
 163         LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
 164         LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
 165         LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
 166         LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
 167         LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
 168         LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
 169         LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
 170         LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
 171         LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
 172         LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
 173         LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
 174         LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
 175         LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
 176         LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
 177         REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
 178         REG_OUT5V(OUT33V, "mbatt",  MAX8907_REG_OUT33VEN, 3300000),
 179         REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
 180                                                 2400000, 3000000, 200000),
 181         REG_FIXED(SDBY, "MBATT", 1200000),
 182         REG_FIXED(VRTC, "MBATT", 3300000),
 183 };
 184
 185 #ifdef CONFIG_OF
 186
 187 #define MATCH(_name, _id) \
 188         [MAX8907_##_id] = { \
 189                 .name = #_name, \
 190                 .driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
 191         }
 192
 193 static struct of_regulator_match max8907_matches[] = {
 194         MATCH(mbatt, MBATT),
 195         MATCH(sd1, SD1),
 196         MATCH(sd2, SD2),
 197         MATCH(sd3, SD3),
 198         MATCH(ldo1, LDO1),
 199         MATCH(ldo2, LDO2),
 200         MATCH(ldo3, LDO3),
 201         MATCH(ldo4, LDO4),
 202         MATCH(ldo5, LDO5),
 203         MATCH(ldo6, LDO6),
 204         MATCH(ldo7, LDO7),
 205         MATCH(ldo8, LDO8),
 206         MATCH(ldo9, LDO9),
 207         MATCH(ldo10, LDO10),
 208         MATCH(ldo11, LDO11),
 209         MATCH(ldo12, LDO12),
 210         MATCH(ldo13, LDO13),
 211         MATCH(ldo14, LDO14),
 212         MATCH(ldo15, LDO15),
 213         MATCH(ldo16, LDO16),
 214         MATCH(ldo17, LDO17),
 215         MATCH(ldo18, LDO18),
 216         MATCH(ldo19, LDO19),
 217         MATCH(ldo20, LDO20),
 218         MATCH(out5v, OUT5V),
 219         MATCH(out33v, OUT33V),
 220         MATCH(bbat, BBAT),
 221         MATCH(sdby, SDBY),
 222         MATCH(vrtc, VRTC),
 223 };
 224
 225 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 226 {
 227         struct device_node *np = pdev->dev.parent->of_node;
 228         struct device_node *regulators;
 229         int ret;
 230
 231         if (!pdev->dev.parent->of_node)
 232                 return 0;
 233
 234         regulators = of_find_node_by_name(np, "regulators");
 235         if (!regulators) {
 236                 dev_err(&pdev->dev, "regulators node not found\n");
 237                 return -EINVAL;
 238         }
 239
 240         ret = of_regulator_match(&pdev->dev, regulators, max8907_matches,
 241                                  ARRAY_SIZE(max8907_matches));
 242         if (ret < 0) {
 243                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 244                         ret);
 245                 return ret;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static inline struct regulator_init_data *match_init_data(int index)
 252 {
 253         return max8907_matches[index].init_data;
 254 }
 255
 256 static inline struct device_node *match_of_node(int index)
 257 {
 258         return max8907_matches[index].of_node;
 259 }
 260 #else
 261 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 262 {
 263         return 0;
 264 }
 265
 266 static inline struct regulator_init_data *match_init_data(int index)
 267 {
 268         return NULL;
 269 }
 270
 271 static inline struct device_node *match_of_node(int index)
 272 {
 273         return NULL;
 274 }
 275 #endif
 276
 277 static int max8907_regulator_probe(struct platform_device *pdev)
 278 {
 279         struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
 280         struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
 281         int ret;
 282         struct max8907_regulator *pmic;
 283         unsigned int val;
 284         int i;
 285         struct regulator_config config = {};
 286         struct regulator_init_data *idata;
 287         const char *mbatt_rail_name = NULL;
 288
 289         ret = max8907_regulator_parse_dt(pdev);
 290         if (ret)
 291                 return ret;
 292
 293         pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 294         if (!pmic) {
 295                 dev_err(&pdev->dev, "Failed to alloc pmic\n");
 296                 return -ENOMEM;
 297         }
 298         platform_set_drvdata(pdev, pmic);
 299
 300         memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));
 301
 302         /* Backwards compatibility with MAX8907B; SD1 uses different voltages */
 303         regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
 304         if ((val & MAX8907_II2RR_VERSION_MASK) ==
 305             MAX8907_II2RR_VERSION_REV_B) {
 306                 pmic->desc[MAX8907_SD1].min_uV = 637500;
 307                 pmic->desc[MAX8907_SD1].uV_step = 12500;
 308                 pmic->desc[MAX8907_SD1].n_voltages =
 309                                                 (1425000 - 637500) / 12500 + 1;
 310         }
 311
 312         for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
 313                 config.dev = pdev->dev.parent;
 314                 if (pdata)
 315                         idata = pdata->init_data[i];
 316                 else
 317                         idata = match_init_data(i);
 318                 config.init_data = idata;
 319                 config.driver_data = pmic;
 320                 config.regmap = max8907->regmap_gen;
 321                 config.of_node = match_of_node(i);
 322
 323                 switch (pmic->desc[i].id) {
 324                 case MAX8907_MBATT:
 325                         if (idata && idata->constraints.name)
 326                                 mbatt_rail_name = idata->constraints.name;
 327                         else
 328                                 mbatt_rail_name = pmic->desc[i].name;
 329                         break;
 330                 case MAX8907_BBAT:
 331                 case MAX8907_SDBY:
 332                 case MAX8907_VRTC:
 333                         idata->supply_regulator = mbatt_rail_name;
 334                         break;
 335                 }
 336
 337                 if (pmic->desc[i].ops == &max8907_ldo_ops) {
 338                         regmap_read(config.regmap, pmic->desc[i].enable_reg,
 339                                     &val);
 340                         if ((val & MAX8907_MASK_LDO_SEQ) !=
 341                             MAX8907_MASK_LDO_SEQ)
 342                                 pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
 343                 } else if (pmic->desc[i].ops == &max8907_out5v_ops) {
 344                         regmap_read(config.regmap, pmic->desc[i].enable_reg,
 345                                     &val);
 346                         if ((val & (MAX8907_MASK_OUT5V_VINEN |
 347                                                 MAX8907_MASK_OUT5V_ENSRC)) !=
 348                             MAX8907_MASK_OUT5V_ENSRC)
 349                                 pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
 350                 }
 351
 352                 pmic->rdev[i] = regulator_register(&pmic->desc[i], &config);
 353                 if (IS_ERR(pmic->rdev[i])) {
 354                         dev_err(&pdev->dev,
 355                                 "failed to register %s regulator\n",
 356                                 pmic->desc[i].name);
 357                         ret = PTR_ERR(pmic->rdev[i]);
 358                         goto err_unregister_regulator;
 359                 }
 360         }
 361
 362         return 0;
 363
 364 err_unregister_regulator:
 365         while (--i >= 0)
 366                 regulator_unregister(pmic->rdev[i]);
 367         return ret;
 368 }
 369
 370 static int max8907_regulator_remove(struct platform_device *pdev)
 371 {
 372         struct max8907_regulator *pmic = platform_get_drvdata(pdev);
 373         int i;
 374
 375         for (i = 0; i < MAX8907_NUM_REGULATORS; i++)
 376                 regulator_unregister(pmic->rdev[i]);
 377
 378         return 0;
 379 }
 380
 381 static struct platform_driver max8907_regulator_driver = {
 382         .driver = {
 383                    .name = "max8907-regulator",
 384                    .owner = THIS_MODULE,
 385                    },
 386         .probe = max8907_regulator_probe,
 387         .remove = max8907_regulator_remove,
 388 };
 389
 390 static int __init max8907_regulator_init(void)
 391 {
 392         return platform_driver_register(&max8907_regulator_driver);
 393 }
 394
 395 subsys_initcall(max8907_regulator_init);
 396
 397 static void __exit max8907_reg_exit(void)
 398 {
 399         platform_driver_unregister(&max8907_regulator_driver);
 400 }
 401
 402 module_exit(max8907_reg_exit);
 403
 404 MODULE_DESCRIPTION("MAX8907 regulator driver");
 405 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 406 MODULE_LICENSE("GPL v2");
 407 MODULE_ALIAS("platform:max8907-regulator");