linux/drivers/regulator/arizona-micsupp.c
<<
>>
Prefs
   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
  25#include <linux/mfd/arizona/core.h>
  26#include <linux/mfd/arizona/pdata.h>
  27#include <linux/mfd/arizona/registers.h>
  28
  29#define ARIZONA_MICSUPP_MAX_SELECTOR 0x1f
  30
  31struct arizona_micsupp {
  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
  39static int arizona_micsupp_list_voltage(struct regulator_dev *rdev,
  40                                        unsigned int selector)
  41{
  42        if (selector > ARIZONA_MICSUPP_MAX_SELECTOR)
  43                return -EINVAL;
  44
  45        if (selector == ARIZONA_MICSUPP_MAX_SELECTOR)
  46                return 3300000;
  47        else
  48                return (selector * 50000) + 1700000;
  49}
  50
  51static int arizona_micsupp_map_voltage(struct regulator_dev *rdev,
  52                                       int min_uV, int max_uV)
  53{
  54        unsigned int voltage;
  55        int selector;
  56
  57        if (min_uV < 1700000)
  58                min_uV = 1700000;
  59
  60        if (min_uV > 3200000)
  61                selector = ARIZONA_MICSUPP_MAX_SELECTOR;
  62        else
  63                selector = DIV_ROUND_UP(min_uV - 1700000, 50000);
  64
  65        if (selector < 0)
  66                return -EINVAL;
  67
  68        voltage = arizona_micsupp_list_voltage(rdev, selector);
  69        if (voltage < min_uV || voltage > max_uV)
  70                return -EINVAL;
  71
  72        return selector;
  73}
  74
  75static struct regulator_ops arizona_micsupp_ops = {
  76        .enable = regulator_enable_regmap,
  77        .disable = regulator_disable_regmap,
  78        .is_enabled = regulator_is_enabled_regmap,
  79
  80        .list_voltage = arizona_micsupp_list_voltage,
  81        .map_voltage = arizona_micsupp_map_voltage,
  82
  83        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  84        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  85};
  86
  87static const struct regulator_desc arizona_micsupp = {
  88        .name = "MICVDD",
  89        .supply_name = "CPVDD",
  90        .type = REGULATOR_VOLTAGE,
  91        .n_voltages = ARIZONA_MICSUPP_MAX_SELECTOR + 1,
  92        .ops = &arizona_micsupp_ops,
  93
  94        .vsel_reg = ARIZONA_LDO2_CONTROL_1,
  95        .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
  96        .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
  97        .enable_mask = ARIZONA_CPMIC_ENA,
  98
  99        .owner = THIS_MODULE,
 100};
 101
 102static const struct regulator_init_data arizona_micsupp_default = {
 103        .constraints = {
 104                .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 105                                REGULATOR_CHANGE_VOLTAGE,
 106                .min_uV = 1700000,
 107                .max_uV = 3300000,
 108        },
 109
 110        .num_consumer_supplies = 1,
 111};
 112
 113static __devinit int arizona_micsupp_probe(struct platform_device *pdev)
 114{
 115        struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 116        struct regulator_config config = { };
 117        struct arizona_micsupp *micsupp;
 118        int ret;
 119
 120        micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 121        if (micsupp == NULL) {
 122                dev_err(&pdev->dev, "Unable to allocate private data\n");
 123                return -ENOMEM;
 124        }
 125
 126        micsupp->arizona = arizona;
 127
 128        /*
 129         * Since the chip usually supplies itself we provide some
 130         * default init_data for it.  This will be overridden with
 131         * platform data if provided.
 132         */
 133        micsupp->init_data = arizona_micsupp_default;
 134        micsupp->init_data.consumer_supplies = &micsupp->supply;
 135        micsupp->supply.supply = "MICVDD";
 136        micsupp->supply.dev_name = dev_name(arizona->dev);
 137
 138        config.dev = arizona->dev;
 139        config.driver_data = micsupp;
 140        config.regmap = arizona->regmap;
 141
 142        if (arizona->pdata.micvdd)
 143                config.init_data = arizona->pdata.micvdd;
 144        else
 145                config.init_data = &micsupp->init_data;
 146
 147        /* Default to regulated mode until the API supports bypass */
 148        regmap_update_bits(arizona->regmap, ARIZONA_MIC_CHARGE_PUMP_1,
 149                           ARIZONA_CPMIC_BYPASS, 0);
 150
 151        micsupp->regulator = regulator_register(&arizona_micsupp, &config);
 152        if (IS_ERR(micsupp->regulator)) {
 153                ret = PTR_ERR(micsupp->regulator);
 154                dev_err(arizona->dev, "Failed to register mic supply: %d\n",
 155                        ret);
 156                return ret;
 157        }
 158
 159        platform_set_drvdata(pdev, micsupp);
 160
 161        return 0;
 162}
 163
 164static __devexit int arizona_micsupp_remove(struct platform_device *pdev)
 165{
 166        struct arizona_micsupp *micsupp = platform_get_drvdata(pdev);
 167
 168        regulator_unregister(micsupp->regulator);
 169
 170        return 0;
 171}
 172
 173static struct platform_driver arizona_micsupp_driver = {
 174        .probe = arizona_micsupp_probe,
 175        .remove = __devexit_p(arizona_micsupp_remove),
 176        .driver         = {
 177                .name   = "arizona-micsupp",
 178                .owner  = THIS_MODULE,
 179        },
 180};
 181
 182module_platform_driver(arizona_micsupp_driver);
 183
 184/* Module information */
 185MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 186MODULE_DESCRIPTION("Arizona microphone supply driver");
 187MODULE_LICENSE("GPL");
 188MODULE_ALIAS("platform:arizona-micsupp");
 189
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.