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

   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// Regulator support for WM8400
   4//
   5// Copyright 2008 Wolfson Microelectronics PLC.
   6//
   7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9#include <linux/bug.h>
  10#include <linux/err.h>
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/regulator/driver.h>
  14#include <linux/mfd/wm8400-private.h>
  15
  16static const struct linear_range wm8400_ldo_ranges[] = {
  17        REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
  18        REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
  19};
  20
  21static const struct regulator_ops wm8400_ldo_ops = {
  22        .is_enabled = regulator_is_enabled_regmap,
  23        .enable = regulator_enable_regmap,
  24        .disable = regulator_disable_regmap,
  25        .list_voltage = regulator_list_voltage_linear_range,
  26        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  27        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  28        .map_voltage = regulator_map_voltage_linear_range,
  29};
  30
  31static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
  32{
  33        struct regmap *rmap = rdev_get_regmap(dev);
  34        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  35        u16 data[2];
  36        int ret;
  37
  38        ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
  39        if (ret != 0)
  40                return 0;
  41
  42        /* Datasheet: hibernate */
  43        if (data[0] & WM8400_DC1_SLEEP)
  44                return REGULATOR_MODE_STANDBY;
  45
  46        /* Datasheet: standby */
  47        if (!(data[0] & WM8400_DC1_ACTIVE))
  48                return REGULATOR_MODE_IDLE;
  49
  50        /* Datasheet: active with or without force PWM */
  51        if (data[1] & WM8400_DC1_FRC_PWM)
  52                return REGULATOR_MODE_FAST;
  53        else
  54                return REGULATOR_MODE_NORMAL;
  55}
  56
  57static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
  58{
  59        struct regmap *rmap = rdev_get_regmap(dev);
  60        int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
  61        int ret;
  62
  63        switch (mode) {
  64        case REGULATOR_MODE_FAST:
  65                /* Datasheet: active with force PWM */
  66                ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
  67                                      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
  68                if (ret != 0)
  69                        return ret;
  70
  71                return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
  72                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  73                                       WM8400_DC1_ACTIVE);
  74
  75        case REGULATOR_MODE_NORMAL:
  76                /* Datasheet: active */
  77                ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
  78                                      WM8400_DC1_FRC_PWM, 0);
  79                if (ret != 0)
  80                        return ret;
  81
  82                return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
  83                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
  84                                       WM8400_DC1_ACTIVE);
  85
  86        case REGULATOR_MODE_IDLE:
  87                /* Datasheet: standby */
  88                return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
  89                                       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
  90        default:
  91                return -EINVAL;
  92        }
  93}
  94
  95static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
  96                                                 int input_uV, int output_uV,
  97                                                 int load_uA)
  98{
  99        return REGULATOR_MODE_NORMAL;
 100}
 101
 102static const struct regulator_ops wm8400_dcdc_ops = {
 103        .is_enabled = regulator_is_enabled_regmap,
 104        .enable = regulator_enable_regmap,
 105        .disable = regulator_disable_regmap,
 106        .list_voltage = regulator_list_voltage_linear,
 107        .map_voltage = regulator_map_voltage_linear,
 108        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 109        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 110        .get_mode = wm8400_dcdc_get_mode,
 111        .set_mode = wm8400_dcdc_set_mode,
 112        .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 113};
 114
 115static struct regulator_desc regulators[] = {
 116        {
 117                .name = "LDO1",
 118                .id = WM8400_LDO1,
 119                .ops = &wm8400_ldo_ops,
 120                .enable_reg = WM8400_LDO1_CONTROL,
 121                .enable_mask = WM8400_LDO1_ENA,
 122                .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 123                .linear_ranges = wm8400_ldo_ranges,
 124                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 125                .vsel_reg = WM8400_LDO1_CONTROL,
 126                .vsel_mask = WM8400_LDO1_VSEL_MASK,
 127                .type = REGULATOR_VOLTAGE,
 128                .owner = THIS_MODULE,
 129        },
 130        {
 131                .name = "LDO2",
 132                .id = WM8400_LDO2,
 133                .ops = &wm8400_ldo_ops,
 134                .enable_reg = WM8400_LDO2_CONTROL,
 135                .enable_mask = WM8400_LDO2_ENA,
 136                .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 137                .linear_ranges = wm8400_ldo_ranges,
 138                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 139                .type = REGULATOR_VOLTAGE,
 140                .vsel_reg = WM8400_LDO2_CONTROL,
 141                .vsel_mask = WM8400_LDO2_VSEL_MASK,
 142                .owner = THIS_MODULE,
 143        },
 144        {
 145                .name = "LDO3",
 146                .id = WM8400_LDO3,
 147                .ops = &wm8400_ldo_ops,
 148                .enable_reg = WM8400_LDO3_CONTROL,
 149                .enable_mask = WM8400_LDO3_ENA,
 150                .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 151                .linear_ranges = wm8400_ldo_ranges,
 152                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 153                .vsel_reg = WM8400_LDO3_CONTROL,
 154                .vsel_mask = WM8400_LDO3_VSEL_MASK,
 155                .type = REGULATOR_VOLTAGE,
 156                .owner = THIS_MODULE,
 157        },
 158        {
 159                .name = "LDO4",
 160                .id = WM8400_LDO4,
 161                .ops = &wm8400_ldo_ops,
 162                .enable_reg = WM8400_LDO4_CONTROL,
 163                .enable_mask = WM8400_LDO4_ENA,
 164                .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 165                .linear_ranges = wm8400_ldo_ranges,
 166                .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
 167                .vsel_reg = WM8400_LDO4_CONTROL,
 168                .vsel_mask = WM8400_LDO4_VSEL_MASK,
 169                .type = REGULATOR_VOLTAGE,
 170                .owner = THIS_MODULE,
 171        },
 172        {
 173                .name = "DCDC1",
 174                .id = WM8400_DCDC1,
 175                .ops = &wm8400_dcdc_ops,
 176                .enable_reg = WM8400_DCDC1_CONTROL_1,
 177                .enable_mask = WM8400_DC1_ENA_MASK,
 178                .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 179                .vsel_reg = WM8400_DCDC1_CONTROL_1,
 180                .vsel_mask = WM8400_DC1_VSEL_MASK,
 181                .min_uV = 850000,
 182                .uV_step = 25000,
 183                .type = REGULATOR_VOLTAGE,
 184                .owner = THIS_MODULE,
 185        },
 186        {
 187                .name = "DCDC2",
 188                .id = WM8400_DCDC2,
 189                .ops = &wm8400_dcdc_ops,
 190                .enable_reg = WM8400_DCDC2_CONTROL_1,
 191                .enable_mask = WM8400_DC2_ENA_MASK,
 192                .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 193                .vsel_reg = WM8400_DCDC2_CONTROL_1,
 194                .vsel_mask = WM8400_DC2_VSEL_MASK,
 195                .min_uV = 850000,
 196                .uV_step = 25000,
 197                .type = REGULATOR_VOLTAGE,
 198                .owner = THIS_MODULE,
 199        },
 200};
 201
 202static int wm8400_regulator_probe(struct platform_device *pdev)
 203{
 204        struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 205        struct regulator_config config = { };
 206        struct regulator_dev *rdev;
 207
 208        config.dev = &pdev->dev;
 209        config.init_data = dev_get_platdata(&pdev->dev);
 210        config.driver_data = wm8400;
 211        config.regmap = wm8400->regmap;
 212
 213        rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
 214                                       &config);
 215        if (IS_ERR(rdev))
 216                return PTR_ERR(rdev);
 217
 218        platform_set_drvdata(pdev, rdev);
 219
 220        return 0;
 221}
 222
 223static struct platform_driver wm8400_regulator_driver = {
 224        .driver = {
 225                .name = "wm8400-regulator",
 226        },
 227        .probe = wm8400_regulator_probe,
 228};
 229
 230/**
 231 * wm8400_register_regulator - enable software control of a WM8400 regulator
 232 *
 233 * This function enables software control of a WM8400 regulator via
 234 * the regulator API.  It is intended to be called from the
 235 * platform_init() callback of the WM8400 MFD driver.
 236 *
 237 * @dev:      The WM8400 device to operate on.
 238 * @reg:      The regulator to control.
 239 * @initdata: Regulator initdata for the regulator.
 240 */
 241int wm8400_register_regulator(struct device *dev, int reg,
 242                              struct regulator_init_data *initdata)
 243{
 244        struct wm8400 *wm8400 = dev_get_drvdata(dev);
 245
 246        if (wm8400->regulators[reg].name)
 247                return -EBUSY;
 248
 249        initdata->driver_data = wm8400;
 250
 251        wm8400->regulators[reg].name = "wm8400-regulator";
 252        wm8400->regulators[reg].id = reg;
 253        wm8400->regulators[reg].dev.parent = dev;
 254        wm8400->regulators[reg].dev.platform_data = initdata;
 255
 256        return platform_device_register(&wm8400->regulators[reg]);
 257}
 258EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 259
 260static int __init wm8400_regulator_init(void)
 261{
 262        return platform_driver_register(&wm8400_regulator_driver);
 263}
 264subsys_initcall(wm8400_regulator_init);
 265
 266static void __exit wm8400_regulator_exit(void)
 267{
 268        platform_driver_unregister(&wm8400_regulator_driver);
 269}
 270module_exit(wm8400_regulator_exit);
 271
 272MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 273MODULE_DESCRIPTION("WM8400 regulator driver");
 274MODULE_LICENSE("GPL");
 275MODULE_ALIAS("platform:wm8400-regulator");
 276