linux/drivers/regulator/wm8994-regulator.c
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   1/*
   2 * wm8994-regulator.c  --  Regulator driver for the WM8994
   3 *
   4 * Copyright 2009 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/gpio.h>
  22#include <linux/slab.h>
  23
  24#include <linux/mfd/wm8994/core.h>
  25#include <linux/mfd/wm8994/registers.h>
  26#include <linux/mfd/wm8994/pdata.h>
  27
  28struct wm8994_ldo {
  29        struct regulator_dev *regulator;
  30        struct wm8994 *wm8994;
  31};
  32
  33#define WM8994_LDO1_MAX_SELECTOR 0x7
  34#define WM8994_LDO2_MAX_SELECTOR 0x3
  35
  36static struct regulator_ops wm8994_ldo1_ops = {
  37        .list_voltage = regulator_list_voltage_linear,
  38        .map_voltage = regulator_map_voltage_linear,
  39        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  40        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  41};
  42
  43static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
  44                                    unsigned int selector)
  45{
  46        struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
  47
  48        if (selector > WM8994_LDO2_MAX_SELECTOR)
  49                return -EINVAL;
  50
  51        switch (ldo->wm8994->type) {
  52        case WM8994:
  53                return (selector * 100000) + 900000;
  54        case WM8958:
  55                return (selector * 100000) + 1000000;
  56        case WM1811:
  57                switch (selector) {
  58                case 0:
  59                        return -EINVAL;
  60                default:
  61                        return (selector * 100000) + 950000;
  62                }
  63                break;
  64        default:
  65                return -EINVAL;
  66        }
  67}
  68
  69static struct regulator_ops wm8994_ldo2_ops = {
  70        .list_voltage = wm8994_ldo2_list_voltage,
  71        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  72        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  73};
  74
  75static const struct regulator_desc wm8994_ldo_desc[] = {
  76        {
  77                .name = "LDO1",
  78                .id = 1,
  79                .type = REGULATOR_VOLTAGE,
  80                .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
  81                .vsel_reg = WM8994_LDO_1,
  82                .vsel_mask = WM8994_LDO1_VSEL_MASK,
  83                .ops = &wm8994_ldo1_ops,
  84                .min_uV = 2400000,
  85                .uV_step = 100000,
  86                .enable_time = 3000,
  87                .owner = THIS_MODULE,
  88        },
  89        {
  90                .name = "LDO2",
  91                .id = 2,
  92                .type = REGULATOR_VOLTAGE,
  93                .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
  94                .vsel_reg = WM8994_LDO_2,
  95                .vsel_mask = WM8994_LDO2_VSEL_MASK,
  96                .ops = &wm8994_ldo2_ops,
  97                .enable_time = 3000,
  98                .owner = THIS_MODULE,
  99        },
 100};
 101
 102static int wm8994_ldo_probe(struct platform_device *pdev)
 103{
 104        struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 105        struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 106        int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 107        struct regulator_config config = { };
 108        struct wm8994_ldo *ldo;
 109        int ret;
 110
 111        dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 112
 113        ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
 114        if (ldo == NULL) {
 115                dev_err(&pdev->dev, "Unable to allocate private data\n");
 116                return -ENOMEM;
 117        }
 118
 119        ldo->wm8994 = wm8994;
 120
 121        config.dev = wm8994->dev;
 122        config.driver_data = ldo;
 123        config.regmap = wm8994->regmap;
 124        if (pdata) {
 125                config.init_data = pdata->ldo[id].init_data;
 126                config.ena_gpio = pdata->ldo[id].enable;
 127        }
 128
 129        ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
 130        if (IS_ERR(ldo->regulator)) {
 131                ret = PTR_ERR(ldo->regulator);
 132                dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
 133                        id + 1, ret);
 134                goto err;
 135        }
 136
 137        platform_set_drvdata(pdev, ldo);
 138
 139        return 0;
 140
 141err:
 142        return ret;
 143}
 144
 145static int wm8994_ldo_remove(struct platform_device *pdev)
 146{
 147        struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
 148
 149        platform_set_drvdata(pdev, NULL);
 150
 151        regulator_unregister(ldo->regulator);
 152
 153        return 0;
 154}
 155
 156static struct platform_driver wm8994_ldo_driver = {
 157        .probe = wm8994_ldo_probe,
 158        .remove = wm8994_ldo_remove,
 159        .driver         = {
 160                .name   = "wm8994-ldo",
 161                .owner  = THIS_MODULE,
 162        },
 163};
 164
 165static int __init wm8994_ldo_init(void)
 166{
 167        int ret;
 168
 169        ret = platform_driver_register(&wm8994_ldo_driver);
 170        if (ret != 0)
 171                pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
 172
 173        return ret;
 174}
 175subsys_initcall(wm8994_ldo_init);
 176
 177static void __exit wm8994_ldo_exit(void)
 178{
 179        platform_driver_unregister(&wm8994_ldo_driver);
 180}
 181module_exit(wm8994_ldo_exit);
 182
 183/* Module information */
 184MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 185MODULE_DESCRIPTION("WM8994 LDO driver");
 186MODULE_LICENSE("GPL");
 187MODULE_ALIAS("platform:wm8994-ldo");
 188
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