drivers/regulator/wm8994-regulator.c

   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
  28 struct 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
  36 static 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
  43 static 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
  69 static 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
  75 static 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
 102 static 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
 141 err:
 142         return ret;
 143 }
 144
 145 static 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
 156 static 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
 165 static 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 }
 175 subsys_initcall(wm8994_ldo_init);
 176
 177 static void __exit wm8994_ldo_exit(void)
 178 {
 179         platform_driver_unregister(&wm8994_ldo_driver);
 180 }
 181 module_exit(wm8994_ldo_exit);
 182
 183 /* Module information */
 184 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 185 MODULE_DESCRIPTION("WM8994 LDO driver");
 186 MODULE_LICENSE("GPL");
 187 MODULE_ALIAS("platform:wm8994-ldo");