linux/drivers/regulator/arizona-micsupp.c
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   1/*
   2 * arizona-micsupp.c  --  Microphone 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#include <linux/workqueue.h>
  25#include <sound/soc.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#define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
  32
  33struct arizona_micsupp {
  34        struct regulator_dev *regulator;
  35        struct arizona *arizona;
  36
  37        struct regulator_consumer_supply supply;
  38        struct regulator_init_data init_data;
  39
  40        struct work_struct check_cp_work;
  41};
  42
  43static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
  44                                        unsigned int selector)
  45{
  46        if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
  47                return -EINVAL;
  48
  49        if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
  50                return 3300000;
  51        else
  52                return (selector * 50000) + 1700000;
  53}
  54
  55static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
  56                                       int min_uV, int max_uV)
  57{
  58        unsigned int voltage;
  59        int selector;
  60
  61        if (min_uV < 1700000)
  62                min_uV = 1700000;
  63
  64        if (min_uV > 3200000)
  65                selector = ARIZONA_MICSUPP_MAX_SELECTOR;
  66        else
  67                selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
  68
  69        if (selector < 0)
  70                return -EINVAL;
  71
  72        voltage = arizona_micsupp_list_voltage(rdev, selector);
  73        if (voltage < min_uV || voltage > max_uV)
  74                return -EINVAL;
  75
  76        return selector;
  77}
  78
  79static void arizona_micsupp_check_cp(struct work_struct *work)
  80{
  81        struct arizona_micsupp *micsupp =
  82                container_of(work, struct arizona_micsupp, check_cp_work);
  83        struct snd_soc_dapm_context *dapm = micsupp->arizona->dapm;
  84        struct arizona *arizona = micsupp->arizona;
  85        struct regmap *regmap = arizona->regmap;
  86        unsigned int reg;
  87        int ret;
  88
  89        ret = regmap_read(regmap, ARIZONA_MIC_CHARGE_PUMP_1, &reg);
  90        if (ret != 0) {
  91                dev_err(arizona->dev, "Failed to read CP state: %d\n", ret);
  92                return;
  93        }
  94
  95        if (dapm) {
  96                if ((reg & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
  97                    ARIZONA_CPMIC_ENA)
  98                        snd_soc_dapm_force_enable_pin(dapm, "MICSUPP");
  99                else
 100                        snd_soc_dapm_disable_pin(dapm, "MICSUPP");
 101
 102                snd_soc_dapm_sync(dapm);
 103        }
 104}
 105
 106static int arizona_micsupp_enable(struct regulator_dev *rdev)
 107{
 108        struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 109        int ret;
 110
 111        ret = regulator_enable_regmap(rdev);
 112
 113        if (ret == 0)
 114                schedule_work(&micsupp->check_cp_work);
 115
 116        return ret;
 117}
 118
 119static int arizona_micsupp_disable(struct regulator_dev *rdev)
 120{
 121        struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 122        int ret;
 123
 124        ret = regulator_disable_regmap(rdev);
 125        if (ret == 0)
 126                schedule_work(&micsupp->check_cp_work);
 127
 128        return ret;
 129}
 130
 131static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
 132{
 133        struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 134        int ret;
 135
 136        ret = regulator_set_bypass_regmap(rdev, ena);
 137        if (ret == 0)
 138                schedule_work(&micsupp->check_cp_work);
 139
 140        return ret;
 141}
 142
 143static struct regulator_ops arizona_micsupp_ops = {
 144        .enable = arizona_micsupp_enable,
 145        .disable = arizona_micsupp_disable,
 146        .is_enabled = regulator_is_enabled_regmap,
 147
 148        .list_voltage = arizona_micsupp_list_voltage,
 149        .map_voltage = arizona_micsupp_map_voltage,
 150
 151        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 152        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 153
 154        .get_bypass = regulator_get_bypass_regmap,
 155        .set_bypass = arizona_micsupp_set_bypass,
 156};
 157
 158static const struct regulator_desc arizona_micsupp = {
 159        .name = "MICVDD",
 160        .supply_name = "CPVDD",
 161        .type = REGULATOR_VOLTAGE,
 162        .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
 163        .ops = &arizona_micsupp_ops,
 164
 165        .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 166        .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 167        .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 168        .enable_mask = ARIZONA_CPMIC_ENA,
 169        .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 170        .bypass_mask = ARIZONA_CPMIC_BYPASS,
 171
 172        .enable_time = 3000,
 173
 174        .owner = THIS_MODULE,
 175};
 176
 177static const struct regulator_init_data arizona_micsupp_default = {
 178        .constraints = {
 179                .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 180                                REGULATOR_CHANGE_VOLTAGE |
 181                                REGULATOR_CHANGE_BYPASS,
 182                .min_uV = 1700000,
 183                .max_uV = 3300000,
 184        },
 185
 186        .num_consumer_supplies = 1,
 187};
 188
 189static int arizona_micsupp_probe(struct platform_device *pdev)
 190{
 191        struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 192        struct regulator_config config = { };
 193        struct arizona_micsupp *micsupp;
 194        int ret;
 195
 196        micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 197        if (micsupp == NULL) {
 198                dev_err(&pdev->dev, "Unable to allocate private data\n");
 199                return -ENOMEM;
 200        }
 201
 202        micsupp->arizona = arizona;
 203        INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
 204
 205        /*
 206         * Since the chip usually supplies itself we provide some
 207         * default init_data for it.  This will be overridden with
 208         * platform data if provided.
 209         */
 210        micsupp->init_data = arizona_micsupp_default;
 211        micsupp->init_data.consumer_supplies = &micsupp->supply;
 212        micsupp->supply.supply = "MICVDD";
 213        micsupp->supply.dev_name = dev_name(arizona->dev);
 214
 215        config.dev = arizona->dev;
 216        config.driver_data = micsupp;
 217        config.regmap = arizona->regmap;
 218
 219        if (arizona->pdata.micvdd)
 220                config.init_data = arizona->pdata.micvdd;
 221        else
 222                config.init_data = &micsupp->init_data;
 223
 224        /* Default to regulated mode until the API supports bypass */
 225        regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 226                           ARIZONA_CPMIC_BYPASS, 0);
 227
 228        micsupp->regulator = regulator_register(&arizona_micsupp, &config);
 229        if (IS_ERR(micsupp->regulator)) {
 230                ret = PTR_ERR(micsupp->regulator);
 231                dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 232                        ret);
 233                return ret;
 234        }
 235
 236        platform_set_drvdata(pdev, micsupp);
 237
 238        return 0;
 239}
 240
 241static int arizona_micsupp_remove(struct platform_device *pdev)
 242{
 243        struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
 244
 245        regulator_unregister(micsupp->regulator);
 246
 247        return 0;
 248}
 249
 250static struct platform_driver arizona_micsupp_driver = {
 251        .probe = arizona_micsupp_probe,
 252        .remove = arizona_micsupp_remove,
 253        .driver         = {
 254                .name   = "arizona-micsupp",
 255                .owner  = THIS_MODULE,
 256        },
 257};
 258
 259module_platform_driver(arizona_micsupp_driver);
 260
 261/* Module information */
 262MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 263MODULE_DESCRIPTION("Arizona microphone supply driver");
 264MODULE_LICENSE("GPL");
 265MODULE_ALIAS("platform:arizona-micsupp");
 266
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