drivers/regulator/max8907-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * max8907-regulator.c -- support regulators in max8907
   4  *
   5  * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
   6  * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
   7  *
   8  * Portions based on drivers/regulator/tps65910-regulator.c,
   9  *     Copyright 2010 Texas Instruments Inc.
  10  *     Author: Graeme Gregory <gg@slimlogic.co.uk>
  11  *     Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
  12  */
  13
  14 #include <linux/err.h>
  15 #include <linux/init.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/mfd/max8907.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/regulator/of_regulator.h>
  24 #include <linux/regmap.h>
  25 #include <linux/slab.h>
  26
  27 #define MAX8907_II2RR_VERSION_MASK      0xF0
  28 #define MAX8907_II2RR_VERSION_REV_A     0x00
  29 #define MAX8907_II2RR_VERSION_REV_B     0x10
  30 #define MAX8907_II2RR_VERSION_REV_C     0x30
  31
  32 struct max8907_regulator {
  33         struct regulator_desc desc[MAX8907_NUM_REGULATORS];
  34 };
  35
  36 #define REG_MBATT() \
  37         [MAX8907_MBATT] = { \
  38                 .name = "MBATT", \
  39                 .supply_name = "mbatt", \
  40                 .id = MAX8907_MBATT, \
  41                 .ops = &max8907_mbatt_ops, \
  42                 .type = REGULATOR_VOLTAGE, \
  43                 .owner = THIS_MODULE, \
  44         }
  45
  46 #define REG_LDO(ids, supply, base, min, max, step) \
  47         [MAX8907_##ids] = { \
  48                 .name = #ids, \
  49                 .supply_name = supply, \
  50                 .id = MAX8907_##ids, \
  51                 .n_voltages = ((max) - (min)) / (step) + 1, \
  52                 .ops = &max8907_ldo_ops, \
  53                 .type = REGULATOR_VOLTAGE, \
  54                 .owner = THIS_MODULE, \
  55                 .min_uV = (min), \
  56                 .uV_step = (step), \
  57                 .vsel_reg = (base) + MAX8907_VOUT, \
  58                 .vsel_mask = 0x3f, \
  59                 .enable_reg = (base) + MAX8907_CTL, \
  60                 .enable_mask = MAX8907_MASK_LDO_EN, \
  61         }
  62
  63 #define REG_FIXED(ids, supply, voltage) \
  64         [MAX8907_##ids] = { \
  65                 .name = #ids, \
  66                 .supply_name = supply, \
  67                 .id = MAX8907_##ids, \
  68                 .n_voltages = 1, \
  69                 .ops = &max8907_fixed_ops, \
  70                 .type = REGULATOR_VOLTAGE, \
  71                 .owner = THIS_MODULE, \
  72                 .min_uV = (voltage), \
  73         }
  74
  75 #define REG_OUT5V(ids, supply, base, voltage) \
  76         [MAX8907_##ids] = { \
  77                 .name = #ids, \
  78                 .supply_name = supply, \
  79                 .id = MAX8907_##ids, \
  80                 .n_voltages = 1, \
  81                 .ops = &max8907_out5v_ops, \
  82                 .type = REGULATOR_VOLTAGE, \
  83                 .owner = THIS_MODULE, \
  84                 .min_uV = (voltage), \
  85                 .enable_reg = (base), \
  86                 .enable_mask = MAX8907_MASK_OUT5V_EN, \
  87         }
  88
  89 #define REG_BBAT(ids, supply, base, min, max, step) \
  90         [MAX8907_##ids] = { \
  91                 .name = #ids, \
  92                 .supply_name = supply, \
  93                 .id = MAX8907_##ids, \
  94                 .n_voltages = ((max) - (min)) / (step) + 1, \
  95                 .ops = &max8907_bbat_ops, \
  96                 .type = REGULATOR_VOLTAGE, \
  97                 .owner = THIS_MODULE, \
  98                 .min_uV = (min), \
  99                 .uV_step = (step), \
 100                 .vsel_reg = (base), \
 101                 .vsel_mask = MAX8907_MASK_VBBATTCV, \
 102         }
 103
 104 #define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \
 105                         750000, 3900000, 50000)
 106 #define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \
 107                         650000, 2225000, 25000)
 108
 109 static const struct regulator_ops max8907_mbatt_ops = {
 110 };
 111
 112 static struct regulator_ops max8907_ldo_ops = {
 113         .list_voltage = regulator_list_voltage_linear,
 114         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 115         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 116         .enable = regulator_enable_regmap,
 117         .disable = regulator_disable_regmap,
 118         .is_enabled = regulator_is_enabled_regmap,
 119 };
 120
 121 static const struct regulator_ops max8907_ldo_hwctl_ops = {
 122         .list_voltage = regulator_list_voltage_linear,
 123         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 124         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 125 };
 126
 127 static const struct regulator_ops max8907_fixed_ops = {
 128         .list_voltage = regulator_list_voltage_linear,
 129 };
 130
 131 static struct regulator_ops max8907_out5v_ops = {
 132         .list_voltage = regulator_list_voltage_linear,
 133         .enable = regulator_enable_regmap,
 134         .disable = regulator_disable_regmap,
 135         .is_enabled = regulator_is_enabled_regmap,
 136 };
 137
 138 static const struct regulator_ops max8907_out5v_hwctl_ops = {
 139         .list_voltage = regulator_list_voltage_linear,
 140 };
 141
 142 static const struct regulator_ops max8907_bbat_ops = {
 143         .list_voltage = regulator_list_voltage_linear,
 144         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 145         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 146 };
 147
 148 static struct regulator_desc max8907_regulators[] = {
 149         REG_MBATT(),
 150         REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
 151         REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
 152         REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
 153         LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
 154         LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
 155         LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
 156         LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
 157         LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
 158         LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
 159         LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
 160         LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
 161         LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
 162         LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
 163         LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
 164         LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
 165         LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
 166         LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
 167         LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
 168         LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
 169         LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
 170         LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
 171         LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
 172         LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
 173         REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
 174         REG_OUT5V(OUT33V, "mbatt",  MAX8907_REG_OUT33VEN, 3300000),
 175         REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG,
 176                                                 2400000, 3000000, 200000),
 177         REG_FIXED(SDBY, "MBATT", 1200000),
 178         REG_FIXED(VRTC, "MBATT", 3300000),
 179 };
 180
 181 #ifdef CONFIG_OF
 182
 183 #define MATCH(_name, _id) \
 184         [MAX8907_##_id] = { \
 185                 .name = #_name, \
 186                 .driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
 187         }
 188
 189 static struct of_regulator_match max8907_matches[] = {
 190         MATCH(mbatt, MBATT),
 191         MATCH(sd1, SD1),
 192         MATCH(sd2, SD2),
 193         MATCH(sd3, SD3),
 194         MATCH(ldo1, LDO1),
 195         MATCH(ldo2, LDO2),
 196         MATCH(ldo3, LDO3),
 197         MATCH(ldo4, LDO4),
 198         MATCH(ldo5, LDO5),
 199         MATCH(ldo6, LDO6),
 200         MATCH(ldo7, LDO7),
 201         MATCH(ldo8, LDO8),
 202         MATCH(ldo9, LDO9),
 203         MATCH(ldo10, LDO10),
 204         MATCH(ldo11, LDO11),
 205         MATCH(ldo12, LDO12),
 206         MATCH(ldo13, LDO13),
 207         MATCH(ldo14, LDO14),
 208         MATCH(ldo15, LDO15),
 209         MATCH(ldo16, LDO16),
 210         MATCH(ldo17, LDO17),
 211         MATCH(ldo18, LDO18),
 212         MATCH(ldo19, LDO19),
 213         MATCH(ldo20, LDO20),
 214         MATCH(out5v, OUT5V),
 215         MATCH(out33v, OUT33V),
 216         MATCH(bbat, BBAT),
 217         MATCH(sdby, SDBY),
 218         MATCH(vrtc, VRTC),
 219 };
 220
 221 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 222 {
 223         struct device_node *np, *regulators;
 224         int ret;
 225
 226         np = pdev->dev.parent->of_node;
 227         if (!np)
 228                 return 0;
 229
 230         regulators = of_get_child_by_name(np, "regulators");
 231         if (!regulators) {
 232                 dev_err(&pdev->dev, "regulators node not found\n");
 233                 return -EINVAL;
 234         }
 235
 236         ret = of_regulator_match(&pdev->dev, regulators, max8907_matches,
 237                                  ARRAY_SIZE(max8907_matches));
 238         of_node_put(regulators);
 239         if (ret < 0) {
 240                 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
 241                         ret);
 242                 return ret;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static inline struct regulator_init_data *match_init_data(int index)
 249 {
 250         return max8907_matches[index].init_data;
 251 }
 252
 253 static inline struct device_node *match_of_node(int index)
 254 {
 255         return max8907_matches[index].of_node;
 256 }
 257 #else
 258 static int max8907_regulator_parse_dt(struct platform_device *pdev)
 259 {
 260         return 0;
 261 }
 262
 263 static inline struct regulator_init_data *match_init_data(int index)
 264 {
 265         return NULL;
 266 }
 267
 268 static inline struct device_node *match_of_node(int index)
 269 {
 270         return NULL;
 271 }
 272 #endif
 273
 274 static int max8907_regulator_probe(struct platform_device *pdev)
 275 {
 276         struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
 277         struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
 278         int ret;
 279         struct max8907_regulator *pmic;
 280         unsigned int val;
 281         int i;
 282         struct regulator_config config = {};
 283         struct regulator_init_data *idata;
 284         const char *mbatt_rail_name = NULL;
 285
 286         ret = max8907_regulator_parse_dt(pdev);
 287         if (ret)
 288                 return ret;
 289
 290         pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 291         if (!pmic)
 292                 return -ENOMEM;
 293
 294         platform_set_drvdata(pdev, pmic);
 295
 296         memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc));
 297
 298         /* Backwards compatibility with MAX8907B; SD1 uses different voltages */
 299         regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val);
 300         if ((val & MAX8907_II2RR_VERSION_MASK) ==
 301             MAX8907_II2RR_VERSION_REV_B) {
 302                 pmic->desc[MAX8907_SD1].min_uV = 637500;
 303                 pmic->desc[MAX8907_SD1].uV_step = 12500;
 304                 pmic->desc[MAX8907_SD1].n_voltages =
 305                                                 (1425000 - 637500) / 12500 + 1;
 306         }
 307
 308         for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
 309                 struct regulator_dev *rdev;
 310
 311                 config.dev = pdev->dev.parent;
 312                 if (pdata)
 313                         idata = pdata->init_data[i];
 314                 else
 315                         idata = match_init_data(i);
 316                 config.init_data = idata;
 317                 config.driver_data = pmic;
 318                 config.regmap = max8907->regmap_gen;
 319                 config.of_node = match_of_node(i);
 320
 321                 switch (pmic->desc[i].id) {
 322                 case MAX8907_MBATT:
 323                         if (idata && idata->constraints.name)
 324                                 mbatt_rail_name = idata->constraints.name;
 325                         else
 326                                 mbatt_rail_name = pmic->desc[i].name;
 327                         break;
 328                 case MAX8907_BBAT:
 329                 case MAX8907_SDBY:
 330                 case MAX8907_VRTC:
 331                         idata->supply_regulator = mbatt_rail_name;
 332                         break;
 333                 }
 334
 335                 if (pmic->desc[i].ops == &max8907_ldo_ops) {
 336                         regmap_read(config.regmap, pmic->desc[i].enable_reg,
 337                                     &val);
 338                         if ((val & MAX8907_MASK_LDO_SEQ) !=
 339                             MAX8907_MASK_LDO_SEQ)
 340                                 pmic->desc[i].ops = &max8907_ldo_hwctl_ops;
 341                 } else if (pmic->desc[i].ops == &max8907_out5v_ops) {
 342                         regmap_read(config.regmap, pmic->desc[i].enable_reg,
 343                                     &val);
 344                         if ((val & (MAX8907_MASK_OUT5V_VINEN |
 345                                                 MAX8907_MASK_OUT5V_ENSRC)) !=
 346                             MAX8907_MASK_OUT5V_ENSRC)
 347                                 pmic->desc[i].ops = &max8907_out5v_hwctl_ops;
 348                 }
 349
 350                 rdev = devm_regulator_register(&pdev->dev,
 351                                                 &pmic->desc[i], &config);
 352                 if (IS_ERR(rdev)) {
 353                         dev_err(&pdev->dev,
 354                                 "failed to register %s regulator\n",
 355                                 pmic->desc[i].name);
 356                         return PTR_ERR(rdev);
 357                 }
 358         }
 359
 360         return 0;
 361 }
 362
 363 static struct platform_driver max8907_regulator_driver = {
 364         .driver = {
 365                    .name = "max8907-regulator",
 366                    },
 367         .probe = max8907_regulator_probe,
 368 };
 369
 370 static int __init max8907_regulator_init(void)
 371 {
 372         return platform_driver_register(&max8907_regulator_driver);
 373 }
 374
 375 subsys_initcall(max8907_regulator_init);
 376
 377 static void __exit max8907_reg_exit(void)
 378 {
 379         platform_driver_unregister(&max8907_regulator_driver);
 380 }
 381
 382 module_exit(max8907_reg_exit);
 383
 384 MODULE_DESCRIPTION("MAX8907 regulator driver");
 385 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
 386 MODULE_LICENSE("GPL v2");
 387 MODULE_ALIAS("platform:max8907-regulator");