linux/drivers/regulator/wm8400-regulator.c
<<
>>
Prefs
   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        { .min_uV =  900000, .max_uV = 1600000, .min_sel = 0, .max_sel = 14,
  24          .uV_step =  50000 },
  25        { .min_uV = 1700000, .max_uV = 3300000, .min_sel = 15, .max_sel = 31,
  26          .uV_step = 100000 },
  27};
  28
  29static struct regulator_ops wm8400_ldo_ops = {
  30        .is_enabled = regulator_is_enabled_regmap,
  31        .enable = regulator_enable_regmap,
  32        .disable = regulator_disable_regmap,
  33        .list_voltage = regulator_list_voltage_linear_range,
  34        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  35        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  36        .map_voltage = regulator_map_voltage_linear_range,
  37};
  38
  39static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
  40{
  41        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  42        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  43        u16 data[2];
  44        int ret;
  45
  46        ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
  47                                data);
  48        if (ret != 0)
  49                return 0;
  50
  51        /* Datasheet: hibernate */
  52        if (data[0] & WM8400_DC1_SLEEP)
  53                return REGULATOR_MODE_STANDBY;
  54
  55        /* Datasheet: standby */
  56        if (!(data[0] & WM8400_DC1_ACTIVE))
  57                return REGULATOR_MODE_IDLE;
  58
  59        /* Datasheet: active with or without force PWM */
  60        if (data[1] & WM8400_DC1_FRC_PWM)
  61                return REGULATOR_MODE_FAST;
  62        else
  63                return REGULATOR_MODE_NORMAL;
  64}
  65
  66static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
  67{
  68        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  69        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  70        int ret;
  71
  72        switch (mode) {
  73        case REGULATOR_MODE_FAST:
  74                /* Datasheet: active with force PWM */
  75                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
  76                                      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
  77                if (ret != 0)
  78                        return ret;
  79
  80                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  81                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  82                                       WM8400_DC1_ACTIVE);
  83
  84        case REGULATOR_MODE_NORMAL:
  85                /* Datasheet: active */
  86                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
  87                                      WM8400_DC1_FRC_PWM, 0);
  88                if (ret != 0)
  89                        return ret;
  90
  91                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  92                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  93                                       WM8400_DC1_ACTIVE);
  94
  95        case REGULATOR_MODE_IDLE:
  96                /* Datasheet: standby */
  97                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
  98                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
  99        default:
 100                return -EINVAL;
 101        }
 102}
 103
 104static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 105                                                 int input_uV, int output_uV,
 106                                                 int load_uA)
 107{
 108        return REGULATOR_MODE_NORMAL;
 109}
 110
 111static struct regulator_ops wm8400_dcdc_ops = {
 112        .is_enabled = regulator_is_enabled_regmap,
 113        .enable = regulator_enable_regmap,
 114        .disable = regulator_disable_regmap,
 115        .list_voltage = regulator_list_voltage_linear,
 116        .map_voltage = regulator_map_voltage_linear,
 117        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 118        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 119        .get_mode = wm8400_dcdc_get_mode,
 120        .set_mode = wm8400_dcdc_set_mode,
 121        .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 122};
 123
 124static struct regulator_desc regulators[] = {
 125        {
 126                .name = "LDO1",
 127                .id = WM8400_LDO1,
 128                .ops = &wm8400_ldo_ops,
 129                .enable_reg = WM8400_LDO1_CONTROL,
 130                .enable_mask = WM8400_LDO1_ENA,
 131                .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 132                .linear_ranges = wm8400_ldo_ranges,
 133                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 134                .vsel_reg = WM8400_LDO1_CONTROL,
 135                .vsel_mask = WM8400_LDO1_VSEL_MASK,
 136                .type = REGULATOR_VOLTAGE,
 137                .owner = THIS_MODULE,
 138        },
 139        {
 140                .name = "LDO2",
 141                .id = WM8400_LDO2,
 142                .ops = &wm8400_ldo_ops,
 143                .enable_reg = WM8400_LDO2_CONTROL,
 144                .enable_mask = WM8400_LDO2_ENA,
 145                .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 146                .linear_ranges = wm8400_ldo_ranges,
 147                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 148                .type = REGULATOR_VOLTAGE,
 149                .vsel_reg = WM8400_LDO2_CONTROL,
 150                .vsel_mask = WM8400_LDO2_VSEL_MASK,
 151                .owner = THIS_MODULE,
 152        },
 153        {
 154                .name = "LDO3",
 155                .id = WM8400_LDO3,
 156                .ops = &wm8400_ldo_ops,
 157                .enable_reg = WM8400_LDO3_CONTROL,
 158                .enable_mask = WM8400_LDO3_ENA,
 159                .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 160                .linear_ranges = wm8400_ldo_ranges,
 161                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 162                .vsel_reg = WM8400_LDO3_CONTROL,
 163                .vsel_mask = WM8400_LDO3_VSEL_MASK,
 164                .type = REGULATOR_VOLTAGE,
 165                .owner = THIS_MODULE,
 166        },
 167        {
 168                .name = "LDO4",
 169                .id = WM8400_LDO4,
 170                .ops = &wm8400_ldo_ops,
 171                .enable_reg = WM8400_LDO4_CONTROL,
 172                .enable_mask = WM8400_LDO4_ENA,
 173                .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 174                .linear_ranges = wm8400_ldo_ranges,
 175                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 176                .vsel_reg = WM8400_LDO4_CONTROL,
 177                .vsel_mask = WM8400_LDO4_VSEL_MASK,
 178                .type = REGULATOR_VOLTAGE,
 179                .owner = THIS_MODULE,
 180        },
 181        {
 182                .name = "DCDC1",
 183                .id = WM8400_DCDC1,
 184                .ops = &wm8400_dcdc_ops,
 185                .enable_reg = WM8400_DCDC1_CONTROL_1,
 186                .enable_mask = WM8400_DC1_ENA_MASK,
 187                .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 188                .vsel_reg = WM8400_DCDC1_CONTROL_1,
 189                .vsel_mask = WM8400_DC1_VSEL_MASK,
 190                .min_uV = 850000,
 191                .uV_step = 25000,
 192                .type = REGULATOR_VOLTAGE,
 193                .owner = THIS_MODULE,
 194        },
 195        {
 196                .name = "DCDC2",
 197                .id = WM8400_DCDC2,
 198                .ops = &wm8400_dcdc_ops,
 199                .enable_reg = WM8400_DCDC2_CONTROL_1,
 200                .enable_mask = WM8400_DC1_ENA_MASK,
 201                .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 202                .vsel_reg = WM8400_DCDC2_CONTROL_1,
 203                .vsel_mask = WM8400_DC2_VSEL_MASK,
 204                .min_uV = 850000,
 205                .uV_step = 25000,
 206                .type = REGULATOR_VOLTAGE,
 207                .owner = THIS_MODULE,
 208        },
 209};
 210
 211static int wm8400_regulator_probe(struct platform_device *pdev)
 212{
 213        struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 214        struct regulator_config config = { };
 215        struct regulator_dev *rdev;
 216
 217        config.dev = &pdev->dev;
 218        config.init_data = dev_get_platdata(&pdev->dev);
 219        config.driver_data = wm8400;
 220        config.regmap = wm8400->regmap;
 221
 222        rdev = regulator_register(&regulators[pdev->id], &config);
 223        if (IS_ERR(rdev))
 224                return PTR_ERR(rdev);
 225
 226        platform_set_drvdata(pdev, rdev);
 227
 228        return 0;
 229}
 230
 231static int wm8400_regulator_remove(struct platform_device *pdev)
 232{
 233        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 234
 235        regulator_unregister(rdev);
 236
 237        return 0;
 238}
 239
 240static struct platform_driver wm8400_regulator_driver = {
 241        .driver = {
 242                .name = "wm8400-regulator",
 243        },
 244        .probe = wm8400_regulator_probe,
 245        .remove = wm8400_regulator_remove,
 246};
 247
 248/**
 249 * wm8400_register_regulator - enable software control of a WM8400 regulator
 250 *
 251 * This function enables software control of a WM8400 regulator via
 252 * the regulator API.  It is intended to be called from the
 253 * platform_init() callback of the WM8400 MFD driver.
 254 *
 255 * @param dev      The WM8400 device to operate on.
 256 * @param reg      The regulator to control.
 257 * @param initdata Regulator initdata for the regulator.
 258 */
 259int wm8400_register_regulator(struct device *dev, int reg,
 260                              struct regulator_init_data *initdata)
 261{
 262        struct wm8400 *wm8400 = dev_get_drvdata(dev);
 263
 264        if (wm8400->regulators[reg].name)
 265                return -EBUSY;
 266
 267        initdata->driver_data = wm8400;
 268
 269        wm8400->regulators[reg].name = "wm8400-regulator";
 270        wm8400->regulators[reg].id = reg;
 271        wm8400->regulators[reg].dev.parent = dev;
 272        wm8400->regulators[reg].dev.platform_data = initdata;
 273
 274        return platform_device_register(&wm8400->regulators[reg]);
 275}
 276EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 277
 278static int __init wm8400_regulator_init(void)
 279{
 280        return platform_driver_register(&wm8400_regulator_driver);
 281}
 282subsys_initcall(wm8400_regulator_init);
 283
 284static void __exit wm8400_regulator_exit(void)
 285{
 286        platform_driver_unregister(&wm8400_regulator_driver);
 287}
 288module_exit(wm8400_regulator_exit);
 289
 290MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 291MODULE_DESCRIPTION("WM8400 regulator driver");
 292MODULE_LICENSE("GPL");
 293MODULE_ALIAS("platform:wm8400-regulator");
 294
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.