drivers/regulator/arizona-ldo1.c

   1 /*
   2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
   3  *
   4  * Copyright 2012 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/of.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #include <linux/gpio.h>
  26 #include <linux/slab.h>
  27
  28 #include <linux/regulator/arizona-ldo1.h>
  29
  30 #include <linux/mfd/arizona/core.h>
  31 #include <linux/mfd/arizona/pdata.h>
  32 #include <linux/mfd/arizona/registers.h>
  33
  34 struct arizona_ldo1 {
  35         struct regulator_dev *regulator;
  36         struct regmap *regmap;
  37
  38         struct regulator_consumer_supply supply;
  39         struct regulator_init_data init_data;
  40 };
  41
  42 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  43                                         unsigned int selector)
  44 {
  45         if (selector >= rdev->desc->n_voltages)
  46                 return -EINVAL;
  47
  48         if (selector == rdev->desc->n_voltages - 1)
  49                 return 1800000;
  50         else
  51                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  52 }
  53
  54 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  55                                        int min_uV, int max_uV)
  56 {
  57         int sel;
  58
  59         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  60         if (sel >= rdev->desc->n_voltages)
  61                 sel = rdev->desc->n_voltages - 1;
  62
  63         return sel;
  64 }
  65
  66 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  67                                            unsigned sel)
  68 {
  69         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  70         struct regmap *regmap = ldo->regmap;
  71         unsigned int val;
  72         int ret;
  73
  74         if (sel == rdev->desc->n_voltages - 1)
  75                 val = ARIZONA_LDO1_HI_PWR;
  76         else
  77                 val = 0;
  78
  79         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  80                                  ARIZONA_LDO1_HI_PWR, val);
  81         if (ret != 0)
  82                 return ret;
  83
  84         if (val)
  85                 return 0;
  86
  87         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  88
  89         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  90                                   ARIZONA_LDO1_VSEL_MASK, val);
  91 }
  92
  93 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  94 {
  95         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  96         struct regmap *regmap = ldo->regmap;
  97         unsigned int val;
  98         int ret;
  99
 100         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
 101         if (ret != 0)
 102                 return ret;
 103
 104         if (val & ARIZONA_LDO1_HI_PWR)
 105                 return rdev->desc->n_voltages - 1;
 106
 107         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 108         if (ret != 0)
 109                 return ret;
 110
 111         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 112 }
 113
 114 static const struct regulator_ops arizona_ldo1_hc_ops = {
 115         .list_voltage = arizona_ldo1_hc_list_voltage,
 116         .map_voltage = arizona_ldo1_hc_map_voltage,
 117         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 118         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 119         .get_bypass = regulator_get_bypass_regmap,
 120         .set_bypass = regulator_set_bypass_regmap,
 121 };
 122
 123 static const struct regulator_desc arizona_ldo1_hc = {
 124         .name = "LDO1",
 125         .supply_name = "LDOVDD",
 126         .type = REGULATOR_VOLTAGE,
 127         .ops = &arizona_ldo1_hc_ops,
 128
 129         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 130         .bypass_mask = ARIZONA_LDO1_BYPASS,
 131         .min_uV = 900000,
 132         .uV_step = 50000,
 133         .n_voltages = 8,
 134         .enable_time = 1500,
 135         .ramp_delay = 24000,
 136
 137         .owner = THIS_MODULE,
 138 };
 139
 140 static const struct regulator_ops arizona_ldo1_ops = {
 141         .list_voltage = regulator_list_voltage_linear,
 142         .map_voltage = regulator_map_voltage_linear,
 143         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 144         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 145 };
 146
 147 static const struct regulator_desc arizona_ldo1 = {
 148         .name = "LDO1",
 149         .supply_name = "LDOVDD",
 150         .type = REGULATOR_VOLTAGE,
 151         .ops = &arizona_ldo1_ops,
 152
 153         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 154         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 155         .min_uV = 900000,
 156         .uV_step = 25000,
 157         .n_voltages = 13,
 158         .enable_time = 500,
 159         .ramp_delay = 24000,
 160
 161         .owner = THIS_MODULE,
 162 };
 163
 164 static const struct regulator_init_data arizona_ldo1_dvfs = {
 165         .constraints = {
 166                 .min_uV = 1200000,
 167                 .max_uV = 1800000,
 168                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 169                                   REGULATOR_CHANGE_VOLTAGE,
 170         },
 171         .num_consumer_supplies = 1,
 172 };
 173
 174 static const struct regulator_init_data arizona_ldo1_default = {
 175         .constraints = {
 176                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 177         },
 178         .num_consumer_supplies = 1,
 179 };
 180
 181 static const struct regulator_init_data arizona_ldo1_wm5110 = {
 182         .constraints = {
 183                 .min_uV = 1175000,
 184                 .max_uV = 1200000,
 185                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 186                                   REGULATOR_CHANGE_VOLTAGE,
 187         },
 188         .num_consumer_supplies = 1,
 189 };
 190
 191 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
 192                                      struct regulator_config *config,
 193                                      const struct regulator_desc *desc,
 194                                      bool *external_dcvdd)
 195 {
 196         struct arizona_ldo1 *ldo1 = config->driver_data;
 197         struct device_node *np = config->dev->of_node;
 198         struct device_node *init_node, *dcvdd_node;
 199         struct regulator_init_data *init_data;
 200
 201         pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
 202         if (pdata->ldoena < 0) {
 203                 dev_warn(config->dev,
 204                          "LDOENA GPIO property missing/malformed: %d\n",
 205                          pdata->ldoena);
 206                 pdata->ldoena = 0;
 207         } else {
 208                 config->ena_gpio_initialized = true;
 209         }
 210
 211         init_node = of_get_child_by_name(np, "ldo1");
 212         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 213
 214         if (init_node) {
 215                 config->of_node = init_node;
 216
 217                 init_data = of_get_regulator_init_data(config->dev, init_node,
 218                                                        desc);
 219                 if (init_data) {
 220                         init_data->consumer_supplies = &ldo1->supply;
 221                         init_data->num_consumer_supplies = 1;
 222
 223                         if (dcvdd_node && dcvdd_node != init_node)
 224                                 *external_dcvdd = true;
 225
 226                         pdata->init_data = init_data;
 227                 }
 228         } else if (dcvdd_node) {
 229                 *external_dcvdd = true;
 230         }
 231
 232         of_node_put(dcvdd_node);
 233
 234         return 0;
 235 }
 236
 237 static int arizona_ldo1_common_init(struct platform_device *pdev,
 238                                     struct arizona_ldo1 *ldo1,
 239                                     const struct regulator_desc *desc,
 240                                     struct arizona_ldo1_pdata *pdata,
 241                                     bool *external_dcvdd)
 242 {
 243         struct device *parent_dev = pdev->dev.parent;
 244         struct regulator_config config = { };
 245         int ret;
 246
 247         *external_dcvdd = false;
 248
 249         ldo1->supply.supply = "DCVDD";
 250         ldo1->init_data.consumer_supplies = &ldo1->supply;
 251         ldo1->supply.dev_name = dev_name(parent_dev);
 252
 253         config.dev = parent_dev;
 254         config.driver_data = ldo1;
 255         config.regmap = ldo1->regmap;
 256
 257         if (IS_ENABLED(CONFIG_OF)) {
 258                 if (!dev_get_platdata(parent_dev)) {
 259                         ret = arizona_ldo1_of_get_pdata(pdata,
 260                                                         &config, desc,
 261                                                         external_dcvdd);
 262                         if (ret < 0)
 263                                 return ret;
 264                 }
 265         }
 266
 267         config.ena_gpio = pdata->ldoena;
 268
 269         if (pdata->init_data)
 270                 config.init_data = pdata->init_data;
 271         else
 272                 config.init_data = &ldo1->init_data;
 273
 274         /*
 275          * LDO1 can only be used to supply DCVDD so if it has no
 276          * consumers then DCVDD is supplied externally.
 277          */
 278         if (config.init_data->num_consumer_supplies == 0)
 279                 *external_dcvdd = true;
 280
 281         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 282
 283         of_node_put(config.of_node);
 284
 285         if (IS_ERR(ldo1->regulator)) {
 286                 ret = PTR_ERR(ldo1->regulator);
 287                 dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
 288                         ret);
 289                 return ret;
 290         }
 291
 292         platform_set_drvdata(pdev, ldo1);
 293
 294         return 0;
 295 }
 296
 297 static int arizona_ldo1_probe(struct platform_device *pdev)
 298 {
 299         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 300         struct arizona_ldo1 *ldo1;
 301         const struct regulator_desc *desc;
 302         bool external_dcvdd;
 303         int ret;
 304
 305         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 306         if (!ldo1)
 307                 return -ENOMEM;
 308
 309         ldo1->regmap = arizona->regmap;
 310
 311         /*
 312          * Since the chip usually supplies itself we provide some
 313          * default init_data for it.  This will be overridden with
 314          * platform data if provided.
 315          */
 316         switch (arizona->type) {
 317         case WM5102:
 318         case WM8997:
 319         case WM8998:
 320         case WM1814:
 321                 desc = &arizona_ldo1_hc;
 322                 ldo1->init_data = arizona_ldo1_dvfs;
 323                 break;
 324         case WM5110:
 325         case WM8280:
 326                 desc = &arizona_ldo1;
 327                 ldo1->init_data = arizona_ldo1_wm5110;
 328                 break;
 329         default:
 330                 desc = &arizona_ldo1;
 331                 ldo1->init_data = arizona_ldo1_default;
 332                 break;
 333         }
 334
 335         ret = arizona_ldo1_common_init(pdev, ldo1, desc,
 336                                        &arizona->pdata.ldo1,
 337                                        &external_dcvdd);
 338         if (ret == 0)
 339                 arizona->external_dcvdd = external_dcvdd;
 340
 341         return ret;
 342 }
 343
 344 static struct platform_driver arizona_ldo1_driver = {
 345         .probe = arizona_ldo1_probe,
 346         .driver         = {
 347                 .name   = "arizona-ldo1",
 348         },
 349 };
 350
 351 module_platform_driver(arizona_ldo1_driver);
 352
 353 /* Module information */
 354 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 355 MODULE_DESCRIPTION("Arizona LDO1 driver");
 356 MODULE_LICENSE("GPL");
 357 MODULE_ALIAS("platform:arizona-ldo1");