LXR linux/drivers/regulator/wm8400-regulator.c

   1/*
   2 * Regulator support for WM8400
   3 *
   4 * Copyright 2008 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
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of the
  11 * License, or (at your option) any later version.
  12 *
  13 */
  14
  15#include <linux/bug.h>
  16#include <linux/err.h>
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/regulator/driver.h>
  20#include <linux/mfd/wm8400-private.h>
  21
  22static const struct regulator_linear_range wm8400_ldo_ranges[] = {
  23        REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
  24        REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
  25};
  26
  27static const struct regulator_ops wm8400_ldo_ops = {
  28        .is_enabled = regulator_is_enabled_regmap,
  29        .enable = regulator_enable_regmap,
  30        .disable = regulator_disable_regmap,
  31        .list_voltage = regulator_list_voltage_linear_range,
  32        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  33        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  34        .map_voltage = regulator_map_voltage_linear_range,
  35};
  36
  37static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
  38{
  39        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  40        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  41        u16 data[2];
  42        int ret;
  43
  44        ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
  45                                data);
  46        if (ret != 0)
  47                return 0;
  48
  49        /* Datasheet: hibernate */
  50        if (data[0] & WM8400_DC1_SLEEP)
  51                return REGULATOR_MODE_STANDBY;
  52
  53        /* Datasheet: standby */
  54        if (!(data[0] & WM8400_DC1_ACTIVE))
  55                return REGULATOR_MODE_IDLE;
  56
  57        /* Datasheet: active with or without force PWM */
  58        if (data[1] & WM8400_DC1_FRC_PWM)
  59                return REGULATOR_MODE_FAST;
  60        else
  61                return REGULATOR_MODE_NORMAL;
  62}
  63
  64static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
  65{
  66        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  67        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  68        int ret;
  69
  70        switch (mode) {
  71        case REGULATOR_MODE_FAST:
  72                /* Datasheet: active with force PWM */
  73                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
  74                                      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
  75                if (ret != 0)
  76                        return ret;
  77
  78                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  79                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  80                                       WM8400_DC1_ACTIVE);
  81
  82        case REGULATOR_MODE_NORMAL:
  83                /* Datasheet: active */
  84                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
  85                                      WM8400_DC1_FRC_PWM, 0);
  86                if (ret != 0)
  87                        return ret;
  88
  89                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  90                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  91                                       WM8400_DC1_ACTIVE);
  92
  93        case REGULATOR_MODE_IDLE:
  94                /* Datasheet: standby */
  95                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  96                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
  97        default:
  98                return -EINVAL;
  99        }
 100}
 101
 102static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 103                                                 int input_uV, int output_uV,
 104                                                 int load_uA)
 105{
 106        return REGULATOR_MODE_NORMAL;
 107}
 108
 109static const struct regulator_ops wm8400_dcdc_ops = {
 110        .is_enabled = regulator_is_enabled_regmap,
 111        .enable = regulator_enable_regmap,
 112        .disable = regulator_disable_regmap,
 113        .list_voltage = regulator_list_voltage_linear,
 114        .map_voltage = regulator_map_voltage_linear,
 115        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 116        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 117        .get_mode = wm8400_dcdc_get_mode,
 118        .set_mode = wm8400_dcdc_set_mode,
 119        .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 120};
 121
 122static struct regulator_desc regulators[] = {
 123        {
 124                .name = "LDO1",
 125                .id = WM8400_LDO1,
 126                .ops = &wm8400_ldo_ops,
 127                .enable_reg = WM8400_LDO1_CONTROL,
 128                .enable_mask = WM8400_LDO1_ENA,
 129                .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 130                .linear_ranges = wm8400_ldo_ranges,
 131                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 132                .vsel_reg = WM8400_LDO1_CONTROL,
 133                .vsel_mask = WM8400_LDO1_VSEL_MASK,
 134                .type = REGULATOR_VOLTAGE,
 135                .owner = THIS_MODULE,
 136        },
 137        {
 138                .name = "LDO2",
 139                .id = WM8400_LDO2,
 140                .ops = &wm8400_ldo_ops,
 141                .enable_reg = WM8400_LDO2_CONTROL,
 142                .enable_mask = WM8400_LDO2_ENA,
 143                .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 144                .linear_ranges = wm8400_ldo_ranges,
 145                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 146                .type = REGULATOR_VOLTAGE,
 147                .vsel_reg = WM8400_LDO2_CONTROL,
 148                .vsel_mask = WM8400_LDO2_VSEL_MASK,
 149                .owner = THIS_MODULE,
 150        },
 151        {
 152                .name = "LDO3",
 153                .id = WM8400_LDO3,
 154                .ops = &wm8400_ldo_ops,
 155                .enable_reg = WM8400_LDO3_CONTROL,
 156                .enable_mask = WM8400_LDO3_ENA,
 157                .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 158                .linear_ranges = wm8400_ldo_ranges,
 159                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 160                .vsel_reg = WM8400_LDO3_CONTROL,
 161                .vsel_mask = WM8400_LDO3_VSEL_MASK,
 162                .type = REGULATOR_VOLTAGE,
 163                .owner = THIS_MODULE,
 164        },
 165        {
 166                .name = "LDO4",
 167                .id = WM8400_LDO4,
 168                .ops = &wm8400_ldo_ops,
 169                .enable_reg = WM8400_LDO4_CONTROL,
 170                .enable_mask = WM8400_LDO4_ENA,
 171                .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 172                .linear_ranges = wm8400_ldo_ranges,
 173                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 174                .vsel_reg = WM8400_LDO4_CONTROL,
 175                .vsel_mask = WM8400_LDO4_VSEL_MASK,
 176                .type = REGULATOR_VOLTAGE,
 177                .owner = THIS_MODULE,
 178        },
 179        {
 180                .name = "DCDC1",
 181                .id = WM8400_DCDC1,
 182                .ops = &wm8400_dcdc_ops,
 183                .enable_reg = WM8400_DCDC1_CONTROL_1,
 184                .enable_mask = WM8400_DC1_ENA_MASK,
 185                .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 186                .vsel_reg = WM8400_DCDC1_CONTROL_1,
 187                .vsel_mask = WM8400_DC1_VSEL_MASK,
 188                .min_uV = 850000,
 189                .uV_step = 25000,
 190                .type = REGULATOR_VOLTAGE,
 191                .owner = THIS_MODULE,
 192        },
 193        {
 194                .name = "DCDC2",
 195                .id = WM8400_DCDC2,
 196                .ops = &wm8400_dcdc_ops,
 197                .enable_reg = WM8400_DCDC2_CONTROL_1,
 198                .enable_mask = WM8400_DC1_ENA_MASK,
 199                .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 200                .vsel_reg = WM8400_DCDC2_CONTROL_1,
 201                .vsel_mask = WM8400_DC2_VSEL_MASK,
 202                .min_uV = 850000,
 203                .uV_step = 25000,
 204                .type = REGULATOR_VOLTAGE,
 205                .owner = THIS_MODULE,
 206        },
 207};
 208
 209static int wm8400_regulator_probe(struct platform_device *pdev)
 210{
 211        struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 212        struct regulator_config config = { };
 213        struct regulator_dev *rdev;
 214
 215        config.dev = &pdev->dev;
 216        config.init_data = dev_get_platdata(&pdev->dev);
 217        config.driver_data = wm8400;
 218        config.regmap = wm8400->regmap;
 219
 220        rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
 221                                       &config);
 222        if (IS_ERR(rdev))
 223                return PTR_ERR(rdev);
 224
 225        platform_set_drvdata(pdev, rdev);
 226
 227        return 0;
 228}
 229
 230static struct platform_driver wm8400_regulator_driver = {
 231        .driver = {
 232                .name = "wm8400-regulator",
 233        },
 234        .probe = wm8400_regulator_probe,
 235};
 236
 237/**
 238 * wm8400_register_regulator - enable software control of a WM8400 regulator
 239 *
 240 * This function enables software control of a WM8400 regulator via
 241 * the regulator API.  It is intended to be called from the
 242 * platform_init() callback of the WM8400 MFD driver.
 243 *
 244 * @param dev      The WM8400 device to operate on.
 245 * @param reg      The regulator to control.
 246 * @param initdata Regulator initdata for the regulator.
 247 */
 248int wm8400_register_regulator(struct device *dev, int reg,
 249                              struct regulator_init_data *initdata)
 250{
 251        struct wm8400 *wm8400 = dev_get_drvdata(dev);
 252
 253        if (wm8400->regulators[reg].name)
 254                return -EBUSY;
 255
 256        initdata->driver_data = wm8400;
 257
 258        wm8400->regulators[reg].name = "wm8400-regulator";
 259        wm8400->regulators[reg].id = reg;
 260        wm8400->regulators[reg].dev.parent = dev;
 261        wm8400->regulators[reg].dev.platform_data = initdata;
 262
 263        return platform_device_register(&wm8400->regulators[reg]);
 264}
 265EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 266
 267static int __init wm8400_regulator_init(void)
 268{
 269        return platform_driver_register(&wm8400_regulator_driver);
 270}
 271subsys_initcall(wm8400_regulator_init);
 272
 273static void __exit wm8400_regulator_exit(void)
 274{
 275        platform_driver_unregister(&wm8400_regulator_driver);
 276}
 277module_exit(wm8400_regulator_exit);
 278
 279MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 280MODULE_DESCRIPTION("WM8400 regulator driver");
 281MODULE_LICENSE("GPL");
 282MODULE_ALIAS("platform:wm8400-regulator");
 283