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 struct regulator_ops arizona_ldo1_ops = {
  38        .list_voltage = regulator_list_voltage_linear,
  39        .map_voltage = regulator_map_voltage_linear,
  40        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  41        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  42};
  43
  44static const struct regulator_desc arizona_ldo1 = {
  45        .name = "LDO1",
  46        .supply_name = "LDOVDD",
  47        .type = REGULATOR_VOLTAGE,
  48        .ops = &arizona_ldo1_ops,
  49
  50        .vsel_reg = ARIZONA_LDO1_CONTROL_1,
  51        .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
  52        .min_uV = 900000,
  53        .uV_step = 50000,
  54        .n_voltages = 7,
  55
  56        .owner = THIS_MODULE,
  57};
  58
  59static const struct regulator_init_data arizona_ldo1_default = {
  60        .constraints = {
  61                .valid_ops_mask = REGULATOR_CHANGE_STATUS,
  62        },
  63        .num_consumer_supplies = 1,
  64};
  65
  66static __devinit int arizona_ldo1_probe(struct platform_device *pdev)
  67{
  68        struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
  69        struct regulator_config config = { };
  70        struct arizona_ldo1 *ldo1;
  71        int ret;
  72
  73        ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
  74        if (ldo1 == NULL) {
  75                dev_err(&pdev->dev, "Unable to allocate private data\n");
  76                return -ENOMEM;
  77        }
  78
  79        ldo1->arizona = arizona;
  80
  81        /*
  82         * Since the chip usually supplies itself we provide some
  83         * default init_data for it.  This will be overridden with
  84         * platform data if provided.
  85         */
  86        ldo1->init_data = arizona_ldo1_default;
  87        ldo1->init_data.consumer_supplies = &ldo1->supply;
  88        ldo1->supply.supply = "DCVDD";
  89        ldo1->supply.dev_name = dev_name(arizona->dev);
  90
  91        config.dev = arizona->dev;
  92        config.driver_data = ldo1;
  93        config.regmap = arizona->regmap;
  94        config.ena_gpio = arizona->pdata.ldoena;
  95
  96        if (arizona->pdata.ldo1)
  97                config.init_data = arizona->pdata.ldo1;
  98        else
  99                config.init_data = &ldo1->init_data;
 100
 101        ldo1->regulator = regulator_register(&arizona_ldo1, &config);
 102        if (IS_ERR(ldo1->regulator)) {
 103                ret = PTR_ERR(ldo1->regulator);
 104                dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 105                        ret);
 106                return ret;
 107        }
 108
 109        platform_set_drvdata(pdev, ldo1);
 110
 111        return 0;
 112}
 113
 114static __devexit int arizona_ldo1_remove(struct platform_device *pdev)
 115{
 116        struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
 117
 118        regulator_unregister(ldo1->regulator);
 119
 120        return 0;
 121}
 122
 123static struct platform_driver arizona_ldo1_driver = {
 124        .probe = arizona_ldo1_probe,
 125        .remove = __devexit_p(arizona_ldo1_remove),
 126        .driver         = {
 127                .name   = "arizona-ldo1",
 128                .owner  = THIS_MODULE,
 129        },
 130};
 131
 132module_platform_driver(arizona_ldo1_driver);
 133
 134/* Module information */
 135MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 136MODULE_DESCRIPTION("Arizona LDO1 driver");
 137MODULE_LICENSE("GPL");
 138MODULE_ALIAS("platform:arizona-ldo1");
 139
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