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 #define ACT8846_GLB_OFF_CTRL    0xc3
  65 #define ACT8846_OFF_SYSMASK     0x18
  66
  67 /*
  68  * ACT8865 Global Register Map.
  69  */
  70 #define ACT8865_SYS_MODE        0x00
  71 #define ACT8865_SYS_CTRL        0x01
  72 #define ACT8865_DCDC1_VSET1     0x20
  73 #define ACT8865_DCDC1_VSET2     0x21
  74 #define ACT8865_DCDC1_CTRL      0x22
  75 #define ACT8865_DCDC2_VSET1     0x30
  76 #define ACT8865_DCDC2_VSET2     0x31
  77 #define ACT8865_DCDC2_CTRL      0x32
  78 #define ACT8865_DCDC3_VSET1     0x40
  79 #define ACT8865_DCDC3_VSET2     0x41
  80 #define ACT8865_DCDC3_CTRL      0x42
  81 #define ACT8865_LDO1_VSET       0x50
  82 #define ACT8865_LDO1_CTRL       0x51
  83 #define ACT8865_LDO2_VSET       0x54
  84 #define ACT8865_LDO2_CTRL       0x55
  85 #define ACT8865_LDO3_VSET       0x60
  86 #define ACT8865_LDO3_CTRL       0x61
  87 #define ACT8865_LDO4_VSET       0x64
  88 #define ACT8865_LDO4_CTRL       0x65
  89 #define ACT8865_MSTROFF         0x20
  90
  91 /*
  92  * Field Definitions.
  93  */
  94 #define ACT8865_ENA             0x80    /* ON - [7] */
  95 #define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
  96
  97 /*
  98  * ACT8865 voltage number
  99  */
 100 #define ACT8865_VOLTAGE_NUM     64
 101
 102 struct act8865 {
 103         struct regmap *regmap;
 104         int off_reg;
 105         int off_mask;
 106 };
 107
 108 static const struct regmap_config act8865_regmap_config = {
 109         .reg_bits = 8,
 110         .val_bits = 8,
 111 };
 112
 113 static const struct regulator_linear_range act8865_voltage_ranges[] = {
 114         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
 115         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
 116         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
 117 };
 118
 119 static struct regulator_ops act8865_ops = {
 120         .list_voltage           = regulator_list_voltage_linear_range,
 121         .map_voltage            = regulator_map_voltage_linear_range,
 122         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 123         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 124         .enable                 = regulator_enable_regmap,
 125         .disable                = regulator_disable_regmap,
 126         .is_enabled             = regulator_is_enabled_regmap,
 127 };
 128
 129 #define ACT88xx_REG(_name, _family, _id, _vsel_reg)                     \
 130         [_family##_ID_##_id] = {                                        \
 131                 .name                   = _name,                        \
 132                 .id                     = _family##_ID_##_id,           \
 133                 .type                   = REGULATOR_VOLTAGE,            \
 134                 .ops                    = &act8865_ops,                 \
 135                 .n_voltages             = ACT8865_VOLTAGE_NUM,          \
 136                 .linear_ranges          = act8865_voltage_ranges,       \
 137                 .n_linear_ranges        = ARRAY_SIZE(act8865_voltage_ranges), \
 138                 .vsel_reg               = _family##_##_id##_##_vsel_reg, \
 139                 .vsel_mask              = ACT8865_VSEL_MASK,            \
 140                 .enable_reg             = _family##_##_id##_CTRL,       \
 141                 .enable_mask            = ACT8865_ENA,                  \
 142                 .owner                  = THIS_MODULE,                  \
 143         }
 144
 145 static const struct regulator_desc act8846_regulators[] = {
 146         ACT88xx_REG("REG1", ACT8846, REG1, VSET),
 147         ACT88xx_REG("REG2", ACT8846, REG2, VSET0),
 148         ACT88xx_REG("REG3", ACT8846, REG3, VSET0),
 149         ACT88xx_REG("REG4", ACT8846, REG4, VSET0),
 150         ACT88xx_REG("REG5", ACT8846, REG5, VSET),
 151         ACT88xx_REG("REG6", ACT8846, REG6, VSET),
 152         ACT88xx_REG("REG7", ACT8846, REG7, VSET),
 153         ACT88xx_REG("REG8", ACT8846, REG8, VSET),
 154         ACT88xx_REG("REG9", ACT8846, REG9, VSET),
 155         ACT88xx_REG("REG10", ACT8846, REG10, VSET),
 156         ACT88xx_REG("REG11", ACT8846, REG11, VSET),
 157         ACT88xx_REG("REG12", ACT8846, REG12, VSET),
 158 };
 159
 160 static const struct regulator_desc act8865_regulators[] = {
 161         ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
 162         ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
 163         ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
 164         ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
 165         ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
 166         ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
 167         ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
 168 };
 169
 170 #ifdef CONFIG_OF
 171 static const struct of_device_id act8865_dt_ids[] = {
 172         { .compatible = "active-semi,act8846", .data = (void *)ACT8846 },
 173         { .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
 174         { }
 175 };
 176 MODULE_DEVICE_TABLE(of, act8865_dt_ids);
 177
 178 static struct of_regulator_match act8846_matches[] = {
 179         [ACT8846_ID_REG1]       = { .name = "REG1" },
 180         [ACT8846_ID_REG2]       = { .name = "REG2" },
 181         [ACT8846_ID_REG3]       = { .name = "REG3" },
 182         [ACT8846_ID_REG4]       = { .name = "REG4" },
 183         [ACT8846_ID_REG5]       = { .name = "REG5" },
 184         [ACT8846_ID_REG6]       = { .name = "REG6" },
 185         [ACT8846_ID_REG7]       = { .name = "REG7" },
 186         [ACT8846_ID_REG8]       = { .name = "REG8" },
 187         [ACT8846_ID_REG9]       = { .name = "REG9" },
 188         [ACT8846_ID_REG10]      = { .name = "REG10" },
 189         [ACT8846_ID_REG11]      = { .name = "REG11" },
 190         [ACT8846_ID_REG12]      = { .name = "REG12" },
 191 };
 192
 193 static struct of_regulator_match act8865_matches[] = {
 194         [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
 195         [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
 196         [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
 197         [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
 198         [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
 199         [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
 200         [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
 201 };
 202
 203 static int act8865_pdata_from_dt(struct device *dev,
 204                                  struct device_node **of_node,
 205                                  struct act8865_platform_data *pdata,
 206                                  unsigned long type)
 207 {
 208         int matched, i, num_matches;
 209         struct device_node *np;
 210         struct act8865_regulator_data *regulator;
 211         struct of_regulator_match *matches;
 212
 213         np = of_get_child_by_name(dev->of_node, "regulators");
 214         if (!np) {
 215                 dev_err(dev, "missing 'regulators' subnode in DT\n");
 216                 return -EINVAL;
 217         }
 218
 219         switch (type) {
 220         case ACT8846:
 221                 matches = act8846_matches;
 222                 num_matches = ARRAY_SIZE(act8846_matches);
 223                 break;
 224         case ACT8865:
 225                 matches = act8865_matches;
 226                 num_matches = ARRAY_SIZE(act8865_matches);
 227                 break;
 228         default:
 229                 dev_err(dev, "invalid device id %lu\n", type);
 230                 return -EINVAL;
 231         }
 232
 233         matched = of_regulator_match(dev, np, matches, num_matches);
 234         of_node_put(np);
 235         if (matched <= 0)
 236                 return matched;
 237
 238         pdata->regulators = devm_kzalloc(dev,
 239                                          sizeof(struct act8865_regulator_data) *
 240                                          num_matches, GFP_KERNEL);
 241         if (!pdata->regulators)
 242                 return -ENOMEM;
 243
 244         pdata->num_regulators = num_matches;
 245         regulator = pdata->regulators;
 246
 247         for (i = 0; i < num_matches; i++) {
 248                 regulator->id = i;
 249                 regulator->name = matches[i].name;
 250                 regulator->platform_data = matches[i].init_data;
 251                 of_node[i] = matches[i].of_node;
 252                 regulator++;
 253         }
 254
 255         return 0;
 256 }
 257 #else
 258 static inline int act8865_pdata_from_dt(struct device *dev,
 259                                         struct device_node **of_node,
 260                                         struct act8865_platform_data *pdata,
 261                                         unsigned long type)
 262 {
 263         return 0;
 264 }
 265 #endif
 266
 267 static struct regulator_init_data
 268 *act8865_get_init_data(int id, struct act8865_platform_data *pdata)
 269 {
 270         int i;
 271
 272         if (!pdata)
 273                 return NULL;
 274
 275         for (i = 0; i < pdata->num_regulators; i++) {
 276                 if (pdata->regulators[i].id == id)
 277                         return pdata->regulators[i].platform_data;
 278         }
 279
 280         return NULL;
 281 }
 282
 283 static struct i2c_client *act8865_i2c_client;
 284 static void act8865_power_off(void)
 285 {
 286         struct act8865 *act8865;
 287
 288         act8865 = i2c_get_clientdata(act8865_i2c_client);
 289         regmap_write(act8865->regmap, act8865->off_reg, act8865->off_mask);
 290         while (1);
 291 }
 292
 293 static int act8865_pmic_probe(struct i2c_client *client,
 294                               const struct i2c_device_id *i2c_id)
 295 {
 296         static const struct regulator_desc *regulators;
 297         struct act8865_platform_data pdata_of, *pdata;
 298         struct device *dev = &client->dev;
 299         struct device_node **of_node;
 300         int i, ret, num_regulators;
 301         struct act8865 *act8865;
 302         unsigned long type;
 303         int off_reg, off_mask;
 304
 305         pdata = dev_get_platdata(dev);
 306
 307         if (dev->of_node && !pdata) {
 308                 const struct of_device_id *id;
 309
 310                 id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
 311                 if (!id)
 312                         return -ENODEV;
 313
 314                 type = (unsigned long) id->data;
 315         } else {
 316                 type = i2c_id->driver_data;
 317         }
 318
 319         switch (type) {
 320         case ACT8846:
 321                 regulators = act8846_regulators;
 322                 num_regulators = ARRAY_SIZE(act8846_regulators);
 323                 off_reg = ACT8846_GLB_OFF_CTRL;
 324                 off_mask = ACT8846_OFF_SYSMASK;
 325                 break;
 326         case ACT8865:
 327                 regulators = act8865_regulators;
 328                 num_regulators = ARRAY_SIZE(act8865_regulators);
 329                 off_reg = ACT8865_SYS_CTRL;
 330                 off_mask = ACT8865_MSTROFF;
 331                 break;
 332         default:
 333                 dev_err(dev, "invalid device id %lu\n", type);
 334                 return -EINVAL;
 335         }
 336
 337         of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
 338                                num_regulators, GFP_KERNEL);
 339         if (!of_node)
 340                 return -ENOMEM;
 341
 342         if (dev->of_node && !pdata) {
 343                 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, type);
 344                 if (ret < 0)
 345                         return ret;
 346
 347                 pdata = &pdata_of;
 348         }
 349
 350         if (pdata->num_regulators > num_regulators) {
 351                 dev_err(dev, "too many regulators: %d\n",
 352                         pdata->num_regulators);
 353                 return -EINVAL;
 354         }
 355
 356         act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
 357         if (!act8865)
 358                 return -ENOMEM;
 359
 360         act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
 361         if (IS_ERR(act8865->regmap)) {
 362                 ret = PTR_ERR(act8865->regmap);
 363                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
 364                         ret);
 365                 return ret;
 366         }
 367
 368         if (of_device_is_system_power_controller(dev->of_node)) {
 369                 if (!pm_power_off) {
 370                         act8865_i2c_client = client;
 371                         act8865->off_reg = off_reg;
 372                         act8865->off_mask = off_mask;
 373                         pm_power_off = act8865_power_off;
 374                 } else {
 375                         dev_err(dev, "Failed to set poweroff capability, already defined\n");
 376                 }
 377         }
 378
 379         /* Finally register devices */
 380         for (i = 0; i < num_regulators; i++) {
 381                 const struct regulator_desc *desc = &regulators[i];
 382                 struct regulator_config config = { };
 383                 struct regulator_dev *rdev;
 384
 385                 config.dev = dev;
 386                 config.init_data = act8865_get_init_data(desc->id, pdata);
 387                 config.of_node = of_node[i];
 388                 config.driver_data = act8865;
 389                 config.regmap = act8865->regmap;
 390
 391                 rdev = devm_regulator_register(&client->dev, desc, &config);
 392                 if (IS_ERR(rdev)) {
 393                         dev_err(dev, "failed to register %s\n", desc->name);
 394                         return PTR_ERR(rdev);
 395                 }
 396         }
 397
 398         i2c_set_clientdata(client, act8865);
 399         devm_kfree(dev, of_node);
 400
 401         return 0;
 402 }
 403
 404 static const struct i2c_device_id act8865_ids[] = {
 405         { .name = "act8846", .driver_data = ACT8846 },
 406         { .name = "act8865", .driver_data = ACT8865 },
 407         { },
 408 };
 409 MODULE_DEVICE_TABLE(i2c, act8865_ids);
 410
 411 static struct i2c_driver act8865_pmic_driver = {
 412         .driver = {
 413                 .name   = "act8865",
 414                 .owner  = THIS_MODULE,
 415         },
 416         .probe          = act8865_pmic_probe,
 417         .id_table       = act8865_ids,
 418 };
 419
 420 module_i2c_driver(act8865_pmic_driver);
 421
 422 MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
 423 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 424 MODULE_LICENSE("GPL v2");