drivers/regulator/act8865-regulator.c

   1 /*
   2  * act8865-regulator.c - Voltage regulation for active-semi ACT88xx PMUs
   3  *
   4  * http://www.active-semi.com/products/power-management-units/act88xx/
   5  *
   6  * Copyright (C) 2013 Atmel Corporation
   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
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/i2c.h>
  22 #include <linux/err.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/regulator/driver.h>
  25 #include <linux/regulator/act8865.h>
  26 #include <linux/of.h>
  27 #include <linux/of_device.h>
  28 #include <linux/regulator/of_regulator.h>
  29 #include <linux/regmap.h>
  30
  31 /*
  32  * ACT8846 Global Register Map.
  33  */
  34 #define ACT8846_SYS0            0x00
  35 #define ACT8846_SYS1            0x01
  36 #define ACT8846_REG1_VSET       0x10
  37 #define ACT8846_REG1_CTRL       0x12
  38 #define ACT8846_REG2_VSET0      0x20
  39 #define ACT8846_REG2_VSET1      0x21
  40 #define ACT8846_REG2_CTRL       0x22
  41 #define ACT8846_REG3_VSET0      0x30
  42 #define ACT8846_REG3_VSET1      0x31
  43 #define ACT8846_REG3_CTRL       0x32
  44 #define ACT8846_REG4_VSET0      0x40
  45 #define ACT8846_REG4_VSET1      0x41
  46 #define ACT8846_REG4_CTRL       0x42
  47 #define ACT8846_REG5_VSET       0x50
  48 #define ACT8846_REG5_CTRL       0x51
  49 #define ACT8846_REG6_VSET       0x58
  50 #define ACT8846_REG6_CTRL       0x59
  51 #define ACT8846_REG7_VSET       0x60
  52 #define ACT8846_REG7_CTRL       0x61
  53 #define ACT8846_REG8_VSET       0x68
  54 #define ACT8846_REG8_CTRL       0x69
  55 #define ACT8846_REG9_VSET       0x70
  56 #define ACT8846_REG9_CTRL       0x71
  57 #define ACT8846_REG10_VSET      0x80
  58 #define ACT8846_REG10_CTRL      0x81
  59 #define ACT8846_REG11_VSET      0x90
  60 #define ACT8846_REG11_CTRL      0x91
  61 #define ACT8846_REG12_VSET      0xa0
  62 #define ACT8846_REG12_CTRL      0xa1
  63 #define ACT8846_REG13_CTRL      0xb1
  64
  65 /*
  66  * ACT8865 Global Register Map.
  67  */
  68 #define ACT8865_SYS_MODE        0x00
  69 #define ACT8865_SYS_CTRL        0x01
  70 #define ACT8865_DCDC1_VSET1     0x20
  71 #define ACT8865_DCDC1_VSET2     0x21
  72 #define ACT8865_DCDC1_CTRL      0x22
  73 #define ACT8865_DCDC2_VSET1     0x30
  74 #define ACT8865_DCDC2_VSET2     0x31
  75 #define ACT8865_DCDC2_CTRL      0x32
  76 #define ACT8865_DCDC3_VSET1     0x40
  77 #define ACT8865_DCDC3_VSET2     0x41
  78 #define ACT8865_DCDC3_CTRL      0x42
  79 #define ACT8865_LDO1_VSET       0x50
  80 #define ACT8865_LDO1_CTRL       0x51
  81 #define ACT8865_LDO2_VSET       0x54
  82 #define ACT8865_LDO2_CTRL       0x55
  83 #define ACT8865_LDO3_VSET       0x60
  84 #define ACT8865_LDO3_CTRL       0x61
  85 #define ACT8865_LDO4_VSET       0x64
  86 #define ACT8865_LDO4_CTRL       0x65
  87
  88 /*
  89  * Field Definitions.
  90  */
  91 #define ACT8865_ENA             0x80    /* ON - [7] */
  92 #define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
  93
  94 /*
  95  * ACT8865 voltage number
  96  */
  97 #define ACT8865_VOLTAGE_NUM     64
  98
  99 struct act8865 {
 100         struct regmap *regmap;
 101 };
 102
 103 static const struct regmap_config act8865_regmap_config = {
 104         .reg_bits = 8,
 105         .val_bits = 8,
 106 };
 107
 108 static const struct regulator_linear_range act8865_voltage_ranges[] = {
 109         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
 110         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
 111         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
 112 };
 113
 114 static struct regulator_ops act8865_ops = {
 115         .list_voltage           = regulator_list_voltage_linear_range,
 116         .map_voltage            = regulator_map_voltage_linear_range,
 117         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 118         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 119         .enable                 = regulator_enable_regmap,
 120         .disable                = regulator_disable_regmap,
 121         .is_enabled             = regulator_is_enabled_regmap,
 122 };
 123
 124 #define ACT88xx_REG(_name, _family, _id, _vsel_reg)                     \
 125         [_family##_ID_##_id] = {                                        \
 126                 .name                   = _name,                        \
 127                 .id                     = _family##_ID_##_id,           \
 128                 .type                   = REGULATOR_VOLTAGE,            \
 129                 .ops                    = &act8865_ops,                 \
 130                 .n_voltages             = ACT8865_VOLTAGE_NUM,          \
 131                 .linear_ranges          = act8865_voltage_ranges,       \
 132                 .n_linear_ranges        = ARRAY_SIZE(act8865_voltage_ranges), \
 133                 .vsel_reg               = _family##_##_id##_##_vsel_reg, \
 134                 .vsel_mask              = ACT8865_VSEL_MASK,            \
 135                 .enable_reg             = _family##_##_id##_CTRL,       \
 136                 .enable_mask            = ACT8865_ENA,                  \
 137                 .owner                  = THIS_MODULE,                  \
 138         }
 139
 140 static const struct regulator_desc act8846_regulators[] = {
 141         ACT88xx_REG("REG1", ACT8846, REG1, VSET),
 142         ACT88xx_REG("REG2", ACT8846, REG2, VSET0),
 143         ACT88xx_REG("REG3", ACT8846, REG3, VSET0),
 144         ACT88xx_REG("REG4", ACT8846, REG4, VSET0),
 145         ACT88xx_REG("REG5", ACT8846, REG5, VSET),
 146         ACT88xx_REG("REG6", ACT8846, REG6, VSET),
 147         ACT88xx_REG("REG7", ACT8846, REG7, VSET),
 148         ACT88xx_REG("REG8", ACT8846, REG8, VSET),
 149         ACT88xx_REG("REG9", ACT8846, REG9, VSET),
 150         ACT88xx_REG("REG10", ACT8846, REG10, VSET),
 151         ACT88xx_REG("REG11", ACT8846, REG11, VSET),
 152         ACT88xx_REG("REG12", ACT8846, REG12, VSET),
 153 };
 154
 155 static const struct regulator_desc act8865_regulators[] = {
 156         ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
 157         ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
 158         ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
 159         ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
 160         ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
 161         ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
 162         ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
 163 };
 164
 165 #ifdef CONFIG_OF
 166 static const struct of_device_id act8865_dt_ids[] = {
 167         { .compatible = "active-semi,act8846", .data = (void *)ACT8846 },
 168         { .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
 169         { }
 170 };
 171 MODULE_DEVICE_TABLE(of, act8865_dt_ids);
 172
 173 static struct of_regulator_match act8846_matches[] = {
 174         [ACT8846_ID_REG1]       = { .name = "REG1" },
 175         [ACT8846_ID_REG2]       = { .name = "REG2" },
 176         [ACT8846_ID_REG3]       = { .name = "REG3" },
 177         [ACT8846_ID_REG4]       = { .name = "REG4" },
 178         [ACT8846_ID_REG5]       = { .name = "REG5" },
 179         [ACT8846_ID_REG6]       = { .name = "REG6" },
 180         [ACT8846_ID_REG7]       = { .name = "REG7" },
 181         [ACT8846_ID_REG8]       = { .name = "REG8" },
 182         [ACT8846_ID_REG9]       = { .name = "REG9" },
 183         [ACT8846_ID_REG10]      = { .name = "REG10" },
 184         [ACT8846_ID_REG11]      = { .name = "REG11" },
 185         [ACT8846_ID_REG12]      = { .name = "REG12" },
 186 };
 187
 188 static struct of_regulator_match act8865_matches[] = {
 189         [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
 190         [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
 191         [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
 192         [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
 193         [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
 194         [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
 195         [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
 196 };
 197
 198 static int act8865_pdata_from_dt(struct device *dev,
 199                                  struct device_node **of_node,
 200                                  struct act8865_platform_data *pdata,
 201                                  unsigned long type)
 202 {
 203         int matched, i, num_matches;
 204         struct device_node *np;
 205         struct act8865_regulator_data *regulator;
 206         struct of_regulator_match *matches;
 207
 208         np = of_get_child_by_name(dev->of_node, "regulators");
 209         if (!np) {
 210                 dev_err(dev, "missing 'regulators' subnode in DT\n");
 211                 return -EINVAL;
 212         }
 213
 214         switch (type) {
 215         case ACT8846:
 216                 matches = act8846_matches;
 217                 num_matches = ARRAY_SIZE(act8846_matches);
 218                 break;
 219         case ACT8865:
 220                 matches = act8865_matches;
 221                 num_matches = ARRAY_SIZE(act8865_matches);
 222                 break;
 223         default:
 224                 dev_err(dev, "invalid device id %lu\n", type);
 225                 return -EINVAL;
 226         }
 227
 228         matched = of_regulator_match(dev, np, matches, num_matches);
 229         of_node_put(np);
 230         if (matched <= 0)
 231                 return matched;
 232
 233         pdata->regulators = devm_kzalloc(dev,
 234                                          sizeof(struct act8865_regulator_data) *
 235                                          num_matches, GFP_KERNEL);
 236         if (!pdata->regulators)
 237                 return -ENOMEM;
 238
 239         pdata->num_regulators = num_matches;
 240         regulator = pdata->regulators;
 241
 242         for (i = 0; i < num_matches; i++) {
 243                 regulator->id = i;
 244                 regulator->name = matches[i].name;
 245                 regulator->platform_data = matches[i].init_data;
 246                 of_node[i] = matches[i].of_node;
 247                 regulator++;
 248         }
 249
 250         return 0;
 251 }
 252 #else
 253 static inline int act8865_pdata_from_dt(struct device *dev,
 254                                         struct device_node **of_node,
 255                                         struct act8865_platform_data *pdata,
 256                                         unsigned long type)
 257 {
 258         return 0;
 259 }
 260 #endif
 261
 262 static struct regulator_init_data
 263 *act8865_get_init_data(int id, struct act8865_platform_data *pdata)
 264 {
 265         int i;
 266
 267         if (!pdata)
 268                 return NULL;
 269
 270         for (i = 0; i < pdata->num_regulators; i++) {
 271                 if (pdata->regulators[i].id == id)
 272                         return pdata->regulators[i].platform_data;
 273         }
 274
 275         return NULL;
 276 }
 277
 278 static int act8865_pmic_probe(struct i2c_client *client,
 279                               const struct i2c_device_id *i2c_id)
 280 {
 281         static const struct regulator_desc *regulators;
 282         struct act8865_platform_data pdata_of, *pdata;
 283         struct device *dev = &client->dev;
 284         struct device_node **of_node;
 285         int i, ret, num_regulators;
 286         struct act8865 *act8865;
 287         unsigned long type;
 288
 289         pdata = dev_get_platdata(dev);
 290
 291         if (dev->of_node && !pdata) {
 292                 const struct of_device_id *id;
 293
 294                 id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
 295                 if (!id)
 296                         return -ENODEV;
 297
 298                 type = (unsigned long) id->data;
 299         } else {
 300                 type = i2c_id->driver_data;
 301         }
 302
 303         switch (type) {
 304         case ACT8846:
 305                 regulators = act8846_regulators;
 306                 num_regulators = ARRAY_SIZE(act8846_regulators);
 307                 break;
 308         case ACT8865:
 309                 regulators = act8865_regulators;
 310                 num_regulators = ARRAY_SIZE(act8865_regulators);
 311                 break;
 312         default:
 313                 dev_err(dev, "invalid device id %lu\n", type);
 314                 return -EINVAL;
 315         }
 316
 317         of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
 318                                num_regulators, GFP_KERNEL);
 319         if (!of_node)
 320                 return -ENOMEM;
 321
 322         if (dev->of_node && !pdata) {
 323                 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, type);
 324                 if (ret < 0)
 325                         return ret;
 326
 327                 pdata = &pdata_of;
 328         }
 329
 330         if (pdata->num_regulators > num_regulators) {
 331                 dev_err(dev, "too many regulators: %d\n",
 332                         pdata->num_regulators);
 333                 return -EINVAL;
 334         }
 335
 336         act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
 337         if (!act8865)
 338                 return -ENOMEM;
 339
 340         act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
 341         if (IS_ERR(act8865->regmap)) {
 342                 ret = PTR_ERR(act8865->regmap);
 343                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
 344                         ret);
 345                 return ret;
 346         }
 347
 348         /* Finally register devices */
 349         for (i = 0; i < num_regulators; i++) {
 350                 const struct regulator_desc *desc = &regulators[i];
 351                 struct regulator_config config = { };
 352                 struct regulator_dev *rdev;
 353
 354                 config.dev = dev;
 355                 config.init_data = act8865_get_init_data(desc->id, pdata);
 356                 config.of_node = of_node[i];
 357                 config.driver_data = act8865;
 358                 config.regmap = act8865->regmap;
 359
 360                 rdev = devm_regulator_register(&client->dev, desc, &config);
 361                 if (IS_ERR(rdev)) {
 362                         dev_err(dev, "failed to register %s\n", desc->name);
 363                         return PTR_ERR(rdev);
 364                 }
 365         }
 366
 367         i2c_set_clientdata(client, act8865);
 368         devm_kfree(dev, of_node);
 369
 370         return 0;
 371 }
 372
 373 static const struct i2c_device_id act8865_ids[] = {
 374         { .name = "act8846", .driver_data = ACT8846 },
 375         { .name = "act8865", .driver_data = ACT8865 },
 376         { },
 377 };
 378 MODULE_DEVICE_TABLE(i2c, act8865_ids);
 379
 380 static struct i2c_driver act8865_pmic_driver = {
 381         .driver = {
 382                 .name   = "act8865",
 383                 .owner  = THIS_MODULE,
 384         },
 385         .probe          = act8865_pmic_probe,
 386         .id_table       = act8865_ids,
 387 };
 388
 389 module_i2c_driver(act8865_pmic_driver);
 390
 391 MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
 392 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 393 MODULE_LICENSE("GPL v2");