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/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/gpio.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/mfd/arizona/core.h>
  28 #include <linux/mfd/arizona/pdata.h>
  29 #include <linux/mfd/arizona/registers.h>
  30
  31 struct arizona_ldo1 {
  32         struct regulator_dev *regulator;
  33         struct arizona *arizona;
  34
  35         struct regulator_consumer_supply supply;
  36         struct regulator_init_data init_data;
  37 };
  38
  39 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  40                                         unsigned int selector)
  41 {
  42         if (selector >= rdev->desc->n_voltages)
  43                 return -EINVAL;
  44
  45         if (selector == rdev->desc->n_voltages - 1)
  46                 return 1800000;
  47         else
  48                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  49 }
  50
  51 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  52                                        int min_uV, int max_uV)
  53 {
  54         int sel;
  55
  56         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  57         if (sel >= rdev->desc->n_voltages)
  58                 sel = rdev->desc->n_voltages - 1;
  59
  60         return sel;
  61 }
  62
  63 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  64                                            unsigned sel)
  65 {
  66         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  67         struct regmap *regmap = ldo->arizona->regmap;
  68         unsigned int val;
  69         int ret;
  70
  71         if (sel == rdev->desc->n_voltages - 1)
  72                 val = ARIZONA_LDO1_HI_PWR;
  73         else
  74                 val = 0;
  75
  76         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  77                                  ARIZONA_LDO1_HI_PWR, val);
  78         if (ret != 0)
  79                 return ret;
  80
  81         if (val)
  82                 return 0;
  83
  84         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  85
  86         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  87                                   ARIZONA_LDO1_VSEL_MASK, val);
  88 }
  89
  90 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  91 {
  92         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  93         struct regmap *regmap = ldo->arizona->regmap;
  94         unsigned int val;
  95         int ret;
  96
  97         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
  98         if (ret != 0)
  99                 return ret;
 100
 101         if (val & ARIZONA_LDO1_HI_PWR)
 102                 return rdev->desc->n_voltages - 1;
 103
 104         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 105         if (ret != 0)
 106                 return ret;
 107
 108         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 109 }
 110
 111 static struct regulator_ops arizona_ldo1_hc_ops = {
 112         .list_voltage = arizona_ldo1_hc_list_voltage,
 113         .map_voltage = arizona_ldo1_hc_map_voltage,
 114         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 115         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 116         .get_bypass = regulator_get_bypass_regmap,
 117         .set_bypass = regulator_set_bypass_regmap,
 118 };
 119
 120 static const struct regulator_desc arizona_ldo1_hc = {
 121         .name = "LDO1",
 122         .supply_name = "LDOVDD",
 123         .type = REGULATOR_VOLTAGE,
 124         .ops = &arizona_ldo1_hc_ops,
 125
 126         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 127         .bypass_mask = ARIZONA_LDO1_BYPASS,
 128         .min_uV = 900000,
 129         .uV_step = 50000,
 130         .n_voltages = 8,
 131         .enable_time = 1500,
 132
 133         .owner = THIS_MODULE,
 134 };
 135
 136 static struct regulator_ops arizona_ldo1_ops = {
 137         .list_voltage = regulator_list_voltage_linear,
 138         .map_voltage = regulator_map_voltage_linear,
 139         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 140         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 141 };
 142
 143 static const struct regulator_desc arizona_ldo1 = {
 144         .name = "LDO1",
 145         .supply_name = "LDOVDD",
 146         .type = REGULATOR_VOLTAGE,
 147         .ops = &arizona_ldo1_ops,
 148
 149         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 150         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 151         .min_uV = 900000,
 152         .uV_step = 25000,
 153         .n_voltages = 13,
 154         .enable_time = 500,
 155
 156         .owner = THIS_MODULE,
 157 };
 158
 159 static const struct regulator_init_data arizona_ldo1_dvfs = {
 160         .constraints = {
 161                 .min_uV = 1200000,
 162                 .max_uV = 1800000,
 163                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 164                                   REGULATOR_CHANGE_VOLTAGE,
 165         },
 166         .num_consumer_supplies = 1,
 167 };
 168
 169 static const struct regulator_init_data arizona_ldo1_default = {
 170         .constraints = {
 171                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 172         },
 173         .num_consumer_supplies = 1,
 174 };
 175
 176 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
 177                                      struct regulator_config *config,
 178                                      const struct regulator_desc *desc)
 179 {
 180         struct arizona_pdata *pdata = &arizona->pdata;
 181         struct arizona_ldo1 *ldo1 = config->driver_data;
 182         struct device_node *init_node, *dcvdd_node;
 183         struct regulator_init_data *init_data;
 184
 185         pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
 186
 187         init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
 188         dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
 189
 190         if (init_node) {
 191                 config->of_node = init_node;
 192
 193                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
 194                                                        desc);
 195
 196                 if (init_data) {
 197                         init_data->consumer_supplies = &ldo1->supply;
 198                         init_data->num_consumer_supplies = 1;
 199
 200                         if (dcvdd_node && dcvdd_node != init_node)
 201                                 arizona->external_dcvdd = true;
 202
 203                         pdata->ldo1 = init_data;
 204                 }
 205         } else if (dcvdd_node) {
 206                 arizona->external_dcvdd = true;
 207         }
 208
 209         of_node_put(dcvdd_node);
 210
 211         return 0;
 212 }
 213
 214 static int arizona_ldo1_probe(struct platform_device *pdev)
 215 {
 216         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 217         const struct regulator_desc *desc;
 218         struct regulator_config config = { };
 219         struct arizona_ldo1 *ldo1;
 220         int ret;
 221
 222         arizona->external_dcvdd = false;
 223
 224         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 225         if (!ldo1)
 226                 return -ENOMEM;
 227
 228         ldo1->arizona = arizona;
 229
 230         /*
 231          * Since the chip usually supplies itself we provide some
 232          * default init_data for it.  This will be overridden with
 233          * platform data if provided.
 234          */
 235         switch (arizona->type) {
 236         case WM5102:
 237         case WM8997:
 238                 desc = &arizona_ldo1_hc;
 239                 ldo1->init_data = arizona_ldo1_dvfs;
 240                 break;
 241         default:
 242                 desc = &arizona_ldo1;
 243                 ldo1->init_data = arizona_ldo1_default;
 244                 break;
 245         }
 246
 247         ldo1->init_data.consumer_supplies = &ldo1->supply;
 248         ldo1->supply.supply = "DCVDD";
 249         ldo1->supply.dev_name = dev_name(arizona->dev);
 250
 251         config.dev = arizona->dev;
 252         config.driver_data = ldo1;
 253         config.regmap = arizona->regmap;
 254
 255         if (IS_ENABLED(CONFIG_OF)) {
 256                 if (!dev_get_platdata(arizona->dev)) {
 257                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
 258                         if (ret < 0)
 259                                 return ret;
 260
 261                         config.ena_gpio_initialized = true;
 262                 }
 263         }
 264
 265         config.ena_gpio = arizona->pdata.ldoena;
 266
 267         if (arizona->pdata.ldo1)
 268                 config.init_data = arizona->pdata.ldo1;
 269         else
 270                 config.init_data = &ldo1->init_data;
 271
 272         /*
 273          * LDO1 can only be used to supply DCVDD so if it has no
 274          * consumers then DCVDD is supplied externally.
 275          */
 276         if (config.init_data->num_consumer_supplies == 0)
 277                 arizona->external_dcvdd = true;
 278
 279         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 280
 281         of_node_put(config.of_node);
 282
 283         if (IS_ERR(ldo1->regulator)) {
 284                 ret = PTR_ERR(ldo1->regulator);
 285                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 286                         ret);
 287                 return ret;
 288         }
 289
 290         platform_set_drvdata(pdev, ldo1);
 291
 292         return 0;
 293 }
 294
 295 static struct platform_driver arizona_ldo1_driver = {
 296         .probe = arizona_ldo1_probe,
 297         .driver         = {
 298                 .name   = "arizona-ldo1",
 299         },
 300 };
 301
 302 module_platform_driver(arizona_ldo1_driver);
 303
 304 /* Module information */
 305 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 306 MODULE_DESCRIPTION("Arizona LDO1 driver");
 307 MODULE_LICENSE("GPL");
 308 MODULE_ALIAS("platform:arizona-ldo1");