linux/drivers/regulator/wm8400-regulator.c
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   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 int wm8400_ldo_list_voltage(struct regulator_dev *dev,
  23                                   unsigned selector)
  24{
  25        if (selector > WM8400_LDO1_VSEL_MASK)
  26                return -EINVAL;
  27
  28        if (selector < 15)
  29                return 900000 + (selector * 50000);
  30        else
  31                return 1700000 + ((selector - 15) * 100000);
  32}
  33
  34static int wm8400_ldo_map_voltage(struct regulator_dev *dev,
  35                                  int min_uV, int max_uV)
  36{
  37        u16 val;
  38        int volt;
  39
  40        if (min_uV < 900000 || min_uV > 3300000)
  41                return -EINVAL;
  42
  43        if (min_uV < 1700000) /* Steps of 50mV from 900mV;  */
  44                val = DIV_ROUND_UP(min_uV - 900000, 50000);
  45        else /* Steps of 100mV from 1700mV */
  46                val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15;
  47
  48        volt = wm8400_ldo_list_voltage(dev, val);
  49        if (volt < min_uV || volt > max_uV)
  50                return -EINVAL;
  51
  52        return val;
  53}
  54
  55static struct regulator_ops wm8400_ldo_ops = {
  56        .is_enabled = regulator_is_enabled_regmap,
  57        .enable = regulator_enable_regmap,
  58        .disable = regulator_disable_regmap,
  59        .list_voltage = wm8400_ldo_list_voltage,
  60        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  61        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  62        .map_voltage = wm8400_ldo_map_voltage,
  63};
  64
  65static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
  66{
  67        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  68        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  69        u16 data[2];
  70        int ret;
  71
  72        ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
  73                                data);
  74        if (ret != 0)
  75                return 0;
  76
  77        /* Datasheet: hibernate */
  78        if (data[0] & WM8400_DC1_SLEEP)
  79                return REGULATOR_MODE_STANDBY;
  80
  81        /* Datasheet: standby */
  82        if (!(data[0] & WM8400_DC1_ACTIVE))
  83                return REGULATOR_MODE_IDLE;
  84
  85        /* Datasheet: active with or without force PWM */
  86        if (data[1] & WM8400_DC1_FRC_PWM)
  87                return REGULATOR_MODE_FAST;
  88        else
  89                return REGULATOR_MODE_NORMAL;
  90}
  91
  92static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
  93{
  94        struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  95        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  96        int ret;
  97
  98        switch (mode) {
  99        case REGULATOR_MODE_FAST:
 100                /* Datasheet: active with force PWM */
 101                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 102                                      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 103                if (ret != 0)
 104                        return ret;
 105
 106                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 107                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 108                                       WM8400_DC1_ACTIVE);
 109
 110        case REGULATOR_MODE_NORMAL:
 111                /* Datasheet: active */
 112                ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 113                                      WM8400_DC1_FRC_PWM, 0);
 114                if (ret != 0)
 115                        return ret;
 116
 117                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 118                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 119                                       WM8400_DC1_ACTIVE);
 120
 121        case REGULATOR_MODE_IDLE:
 122                /* Datasheet: standby */
 123                return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 124                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
 125        default:
 126                return -EINVAL;
 127        }
 128}
 129
 130static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 131                                                 int input_uV, int output_uV,
 132                                                 int load_uA)
 133{
 134        return REGULATOR_MODE_NORMAL;
 135}
 136
 137static struct regulator_ops wm8400_dcdc_ops = {
 138        .is_enabled = regulator_is_enabled_regmap,
 139        .enable = regulator_enable_regmap,
 140        .disable = regulator_disable_regmap,
 141        .list_voltage = regulator_list_voltage_linear,
 142        .map_voltage = regulator_map_voltage_linear,
 143        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 144        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 145        .get_mode = wm8400_dcdc_get_mode,
 146        .set_mode = wm8400_dcdc_set_mode,
 147        .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 148};
 149
 150static struct regulator_desc regulators[] = {
 151        {
 152                .name = "LDO1",
 153                .id = WM8400_LDO1,
 154                .ops = &wm8400_ldo_ops,
 155                .enable_reg = WM8400_LDO1_CONTROL,
 156                .enable_mask = WM8400_LDO1_ENA,
 157                .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 158                .vsel_reg = WM8400_LDO1_CONTROL,
 159                .vsel_mask = WM8400_LDO1_VSEL_MASK,
 160                .type = REGULATOR_VOLTAGE,
 161                .owner = THIS_MODULE,
 162        },
 163        {
 164                .name = "LDO2",
 165                .id = WM8400_LDO2,
 166                .ops = &wm8400_ldo_ops,
 167                .enable_reg = WM8400_LDO2_CONTROL,
 168                .enable_mask = WM8400_LDO2_ENA,
 169                .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 170                .type = REGULATOR_VOLTAGE,
 171                .vsel_reg = WM8400_LDO2_CONTROL,
 172                .vsel_mask = WM8400_LDO2_VSEL_MASK,
 173                .owner = THIS_MODULE,
 174        },
 175        {
 176                .name = "LDO3",
 177                .id = WM8400_LDO3,
 178                .ops = &wm8400_ldo_ops,
 179                .enable_reg = WM8400_LDO3_CONTROL,
 180                .enable_mask = WM8400_LDO3_ENA,
 181                .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 182                .vsel_reg = WM8400_LDO3_CONTROL,
 183                .vsel_mask = WM8400_LDO3_VSEL_MASK,
 184                .type = REGULATOR_VOLTAGE,
 185                .owner = THIS_MODULE,
 186        },
 187        {
 188                .name = "LDO4",
 189                .id = WM8400_LDO4,
 190                .ops = &wm8400_ldo_ops,
 191                .enable_reg = WM8400_LDO4_CONTROL,
 192                .enable_mask = WM8400_LDO4_ENA,
 193                .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 194                .vsel_reg = WM8400_LDO4_CONTROL,
 195                .vsel_mask = WM8400_LDO4_VSEL_MASK,
 196                .type = REGULATOR_VOLTAGE,
 197                .owner = THIS_MODULE,
 198        },
 199        {
 200                .name = "DCDC1",
 201                .id = WM8400_DCDC1,
 202                .ops = &wm8400_dcdc_ops,
 203                .enable_reg = WM8400_DCDC1_CONTROL_1,
 204                .enable_mask = WM8400_DC1_ENA_MASK,
 205                .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 206                .vsel_reg = WM8400_DCDC1_CONTROL_1,
 207                .vsel_mask = WM8400_DC1_VSEL_MASK,
 208                .min_uV = 850000,
 209                .uV_step = 25000,
 210                .type = REGULATOR_VOLTAGE,
 211                .owner = THIS_MODULE,
 212        },
 213        {
 214                .name = "DCDC2",
 215                .id = WM8400_DCDC2,
 216                .ops = &wm8400_dcdc_ops,
 217                .enable_reg = WM8400_DCDC2_CONTROL_1,
 218                .enable_mask = WM8400_DC1_ENA_MASK,
 219                .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 220                .vsel_reg = WM8400_DCDC2_CONTROL_1,
 221                .vsel_mask = WM8400_DC2_VSEL_MASK,
 222                .min_uV = 850000,
 223                .uV_step = 25000,
 224                .type = REGULATOR_VOLTAGE,
 225                .owner = THIS_MODULE,
 226        },
 227};
 228
 229static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
 230{
 231        struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 232        struct regulator_config config = { };
 233        struct regulator_dev *rdev;
 234
 235        config.dev = &pdev->dev;
 236        config.init_data = pdev->dev.platform_data;
 237        config.driver_data = wm8400;
 238        config.regmap = wm8400->regmap;
 239
 240        rdev = regulator_register(&regulators[pdev->id], &config);
 241        if (IS_ERR(rdev))
 242                return PTR_ERR(rdev);
 243
 244        platform_set_drvdata(pdev, rdev);
 245
 246        return 0;
 247}
 248
 249static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
 250{
 251        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 252
 253        platform_set_drvdata(pdev, NULL);
 254        regulator_unregister(rdev);
 255
 256        return 0;
 257}
 258
 259static struct platform_driver wm8400_regulator_driver = {
 260        .driver = {
 261                .name = "wm8400-regulator",
 262        },
 263        .probe = wm8400_regulator_probe,
 264        .remove = __devexit_p(wm8400_regulator_remove),
 265};
 266
 267/**
 268 * wm8400_register_regulator - enable software control of a WM8400 regulator
 269 *
 270 * This function enables software control of a WM8400 regulator via
 271 * the regulator API.  It is intended to be called from the
 272 * platform_init() callback of the WM8400 MFD driver.
 273 *
 274 * @param dev      The WM8400 device to operate on.
 275 * @param reg      The regulator to control.
 276 * @param initdata Regulator initdata for the regulator.
 277 */
 278int wm8400_register_regulator(struct device *dev, int reg,
 279                              struct regulator_init_data *initdata)
 280{
 281        struct wm8400 *wm8400 = dev_get_drvdata(dev);
 282
 283        if (wm8400->regulators[reg].name)
 284                return -EBUSY;
 285
 286        initdata->driver_data = wm8400;
 287
 288        wm8400->regulators[reg].name = "wm8400-regulator";
 289        wm8400->regulators[reg].id = reg;
 290        wm8400->regulators[reg].dev.parent = dev;
 291        wm8400->regulators[reg].dev.platform_data = initdata;
 292
 293        return platform_device_register(&wm8400->regulators[reg]);
 294}
 295EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 296
 297static int __init wm8400_regulator_init(void)
 298{
 299        return platform_driver_register(&wm8400_regulator_driver);
 300}
 301subsys_initcall(wm8400_regulator_init);
 302
 303static void __exit wm8400_regulator_exit(void)
 304{
 305        platform_driver_unregister(&wm8400_regulator_driver);
 306}
 307module_exit(wm8400_regulator_exit);
 308
 309MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 310MODULE_DESCRIPTION("WM8400 regulator driver");
 311MODULE_LICENSE("GPL");
 312MODULE_ALIAS("platform:wm8400-regulator");
 313
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