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/regulator/machine.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/slab.h>
  24
  25 #include <linux/mfd/wm8994/core.h>
  26 #include <linux/mfd/wm8994/registers.h>
  27 #include <linux/mfd/wm8994/pdata.h>
  28
  29 struct wm8994_ldo {
  30         struct regulator_dev *regulator;
  31         struct wm8994 *wm8994;
  32         struct regulator_consumer_supply supply;
  33         struct regulator_init_data init_data;
  34 };
  35
  36 #define WM8994_LDO1_MAX_SELECTOR 0x7
  37 #define WM8994_LDO2_MAX_SELECTOR 0x3
  38
  39 static const struct regulator_ops wm8994_ldo1_ops = {
  40         .list_voltage = regulator_list_voltage_linear,
  41         .map_voltage = regulator_map_voltage_linear,
  42         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  43         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  44 };
  45
  46 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
  47                                     unsigned int selector)
  48 {
  49         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
  50
  51         if (selector > WM8994_LDO2_MAX_SELECTOR)
  52                 return -EINVAL;
  53
  54         switch (ldo->wm8994->type) {
  55         case WM8994:
  56                 return (selector * 100000) + 900000;
  57         case WM8958:
  58                 return (selector * 100000) + 1000000;
  59         case WM1811:
  60                 switch (selector) {
  61                 case 0:
  62                         return -EINVAL;
  63                 default:
  64                         return (selector * 100000) + 950000;
  65                 }
  66                 break;
  67         default:
  68                 return -EINVAL;
  69         }
  70 }
  71
  72 static const struct regulator_ops wm8994_ldo2_ops = {
  73         .list_voltage = wm8994_ldo2_list_voltage,
  74         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  75         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  76 };
  77
  78 static const struct regulator_desc wm8994_ldo_desc[] = {
  79         {
  80                 .name = "LDO1",
  81                 .id = 1,
  82                 .type = REGULATOR_VOLTAGE,
  83                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
  84                 .vsel_reg = WM8994_LDO_1,
  85                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
  86                 .ops = &wm8994_ldo1_ops,
  87                 .min_uV = 2400000,
  88                 .uV_step = 100000,
  89                 .enable_time = 3000,
  90                 .owner = THIS_MODULE,
  91         },
  92         {
  93                 .name = "LDO2",
  94                 .id = 2,
  95                 .type = REGULATOR_VOLTAGE,
  96                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
  97                 .vsel_reg = WM8994_LDO_2,
  98                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
  99                 .ops = &wm8994_ldo2_ops,
 100                 .enable_time = 3000,
 101                 .owner = THIS_MODULE,
 102         },
 103 };
 104
 105 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
 106         { .supply = "AVDD1" },
 107         { .supply = "DCVDD" },
 108 };
 109
 110 static const struct regulator_init_data wm8994_ldo_default[] = {
 111         {
 112                 .constraints = {
 113                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 114                 },
 115                 .num_consumer_supplies = 1,
 116         },
 117         {
 118                 .constraints = {
 119                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 120                 },
 121                 .num_consumer_supplies = 1,
 122         },
 123 };
 124
 125 static int wm8994_ldo_probe(struct platform_device *pdev)
 126 {
 127         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 128         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
 129         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 130         struct regulator_config config = { };
 131         struct wm8994_ldo *ldo;
 132         struct gpio_desc *gpiod;
 133         int ret;
 134
 135         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 136
 137         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
 138         if (!ldo)
 139                 return -ENOMEM;
 140
 141         ldo->wm8994 = wm8994;
 142         ldo->supply = wm8994_ldo_consumer[id];
 143         ldo->supply.dev_name = dev_name(wm8994->dev);
 144
 145         config.dev = wm8994->dev;
 146         config.driver_data = ldo;
 147         config.regmap = wm8994->regmap;
 148         config.init_data = &ldo->init_data;
 149
 150         /*
 151          * Look up LDO enable GPIO from the parent device node, we don't
 152          * use devm because the regulator core will free the GPIO
 153          */
 154         gpiod = gpiod_get_optional(pdev->dev.parent,
 155                                    id ? "wlf,ldo2ena" : "wlf,ldo1ena",
 156                                    GPIOD_OUT_LOW |
 157                                    GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 158         if (IS_ERR(gpiod))
 159                 return PTR_ERR(gpiod);
 160         config.ena_gpiod = gpiod;
 161
 162         /* Use default constraints if none set up */
 163         if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
 164                 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
 165                         ldo->supply.dev_name, ldo->supply.supply);
 166
 167                 ldo->init_data = wm8994_ldo_default[id];
 168                 ldo->init_data.consumer_supplies = &ldo->supply;
 169                 if (!gpiod)
 170                         ldo->init_data.constraints.valid_ops_mask = 0;
 171         } else {
 172                 ldo->init_data = *pdata->ldo[id].init_data;
 173         }
 174
 175         /*
 176          * At this point the GPIO descriptor is handled over to the
 177          * regulator core and we need not worry about it on the
 178          * error path.
 179          */
 180         ldo->regulator = devm_regulator_register(&pdev->dev,
 181                                                  &wm8994_ldo_desc[id],
 182                                                  &config);
 183         if (IS_ERR(ldo->regulator)) {
 184                 ret = PTR_ERR(ldo->regulator);
 185                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
 186                         id + 1, ret);
 187                 return ret;
 188         }
 189
 190         platform_set_drvdata(pdev, ldo);
 191
 192         return 0;
 193 }
 194
 195 static struct platform_driver wm8994_ldo_driver = {
 196         .probe = wm8994_ldo_probe,
 197         .driver         = {
 198                 .name   = "wm8994-ldo",
 199         },
 200 };
 201
 202 module_platform_driver(wm8994_ldo_driver);
 203
 204 /* Module information */
 205 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 206 MODULE_DESCRIPTION("WM8994 LDO driver");
 207 MODULE_LICENSE("GPL");
 208 MODULE_ALIAS("platform:wm8994-ldo");