linux/drivers/regulator/arizona-ldo1.c
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   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/platform_device.h>
  20#include <linux/regulator/driver.h>
  21#include <linux/regulator/machine.h>
  22#include <linux/gpio.h>
  23#include <linux/slab.h>
  24
  25#include <linux/mfd/arizona/core.h>
  26#include <linux/mfd/arizona/pdata.h>
  27#include <linux/mfd/arizona/registers.h>
  28
  29struct arizona_ldo1 {
  30        struct regulator_dev *regulator;
  31        struct arizona *arizona;
  32
  33        struct regulator_consumer_supply supply;
  34        struct regulator_init_data init_data;
  35};
  36
  37static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  38                                        unsigned int selector)
  39{
  40        if (selector >= rdev->desc->n_voltages)
  41                return -EINVAL;
  42
  43        if (selector == rdev->desc->n_voltages - 1)
  44                return 1800000;
  45        else
  46                return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  47}
  48
  49static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  50                                       int min_uV, int max_uV)
  51{
  52        int sel;
  53
  54        sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  55        if (sel >= rdev->desc->n_voltages)
  56                sel = rdev->desc->n_voltages - 1;
  57
  58        return sel;
  59}
  60
  61static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  62                                           unsigned sel)
  63{
  64        struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  65        struct regmap *regmap = ldo->arizona->regmap;
  66        unsigned int val;
  67        int ret;
  68
  69        if (sel == rdev->desc->n_voltages - 1)
  70                val = ARIZONA_LDO1_HI_PWR;
  71        else
  72                val = 0;
  73
  74        ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  75                                 ARIZONA_LDO1_HI_PWR, val);
  76        if (ret != 0)
  77                return ret;
  78
  79        ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
  80                                 ARIZONA_SUBSYS_MAX_FREQ, 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
  93static 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->arizona->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
 114static 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
 123static 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
 136        .owner = THIS_MODULE,
 137};
 138
 139static struct regulator_ops arizona_ldo1_ops = {
 140        .list_voltage = regulator_list_voltage_linear,
 141        .map_voltage = regulator_map_voltage_linear,
 142        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 143        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 144        .get_bypass = regulator_get_bypass_regmap,
 145        .set_bypass = regulator_set_bypass_regmap,
 146};
 147
 148static const struct regulator_desc arizona_ldo1 = {
 149        .name = "LDO1",
 150        .supply_name = "LDOVDD",
 151        .type = REGULATOR_VOLTAGE,
 152        .ops = &arizona_ldo1_ops,
 153
 154        .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 155        .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 156        .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 157        .bypass_mask = ARIZONA_LDO1_BYPASS,
 158        .min_uV = 900000,
 159        .uV_step = 50000,
 160        .n_voltages = 7,
 161        .enable_time = 500,
 162
 163        .owner = THIS_MODULE,
 164};
 165
 166static const struct regulator_init_data arizona_ldo1_dvfs = {
 167        .constraints = {
 168                .min_uV = 1200000,
 169                .max_uV = 1800000,
 170                .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 171                                  REGULATOR_CHANGE_VOLTAGE,
 172        },
 173        .num_consumer_supplies = 1,
 174};
 175
 176static const struct regulator_init_data arizona_ldo1_default = {
 177        .constraints = {
 178                .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 179        },
 180        .num_consumer_supplies = 1,
 181};
 182
 183static int arizona_ldo1_probe(struct platform_device *pdev)
 184{
 185        struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 186        const struct regulator_desc *desc;
 187        struct regulator_config config = { };
 188        struct arizona_ldo1 *ldo1;
 189        int ret;
 190
 191        ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 192        if (ldo1 == NULL) {
 193                dev_err(&pdev->dev, "Unable to allocate private data\n");
 194                return -ENOMEM;
 195        }
 196
 197        ldo1->arizona = arizona;
 198
 199        /*
 200         * Since the chip usually supplies itself we provide some
 201         * default init_data for it.  This will be overridden with
 202         * platform data if provided.
 203         */
 204        switch (arizona->type) {
 205        case WM5102:
 206                desc = &arizona_ldo1_hc;
 207                ldo1->init_data = arizona_ldo1_dvfs;
 208                break;
 209        default:
 210                desc = &arizona_ldo1;
 211                ldo1->init_data = arizona_ldo1_default;
 212                break;
 213        }
 214
 215        ldo1->init_data.consumer_supplies = &ldo1->supply;
 216        ldo1->supply.supply = "DCVDD";
 217        ldo1->supply.dev_name = dev_name(arizona->dev);
 218
 219        config.dev = arizona->dev;
 220        config.driver_data = ldo1;
 221        config.regmap = arizona->regmap;
 222        config.ena_gpio = arizona->pdata.ldoena;
 223
 224        if (arizona->pdata.ldo1)
 225                config.init_data = arizona->pdata.ldo1;
 226        else
 227                config.init_data = &ldo1->init_data;
 228
 229        ldo1->regulator = regulator_register(desc, &config);
 230        if (IS_ERR(ldo1->regulator)) {
 231                ret = PTR_ERR(ldo1->regulator);
 232                dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 233                        ret);
 234                return ret;
 235        }
 236
 237        platform_set_drvdata(pdev, ldo1);
 238
 239        return 0;
 240}
 241
 242static int arizona_ldo1_remove(struct platform_device *pdev)
 243{
 244        struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
 245
 246        regulator_unregister(ldo1->regulator);
 247
 248        return 0;
 249}
 250
 251static struct platform_driver arizona_ldo1_driver = {
 252        .probe = arizona_ldo1_probe,
 253        .remove = arizona_ldo1_remove,
 254        .driver         = {
 255                .name   = "arizona-ldo1",
 256                .owner  = THIS_MODULE,
 257        },
 258};
 259
 260module_platform_driver(arizona_ldo1_driver);
 261
 262/* Module information */
 263MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 264MODULE_DESCRIPTION("Arizona LDO1 driver");
 265MODULE_LICENSE("GPL");
 266MODULE_ALIAS("platform:arizona-ldo1");
 267
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