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
  22 static 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
  27 static 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
  37 static 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
  64 static 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
 102 static 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
 109 static 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
 122 static 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
 209 static 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
 230 static 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  */
 248 int 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 }
 265 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 266
 267 static int __init wm8400_regulator_init(void)
 268 {
 269         return platform_driver_register(&wm8400_regulator_driver);
 270 }
 271 subsys_initcall(wm8400_regulator_init);
 272
 273 static void __exit wm8400_regulator_exit(void)
 274 {
 275         platform_driver_unregister(&wm8400_regulator_driver);
 276 }
 277 module_exit(wm8400_regulator_exit);
 278
 279 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 280 MODULE_DESCRIPTION("WM8400 regulator driver");
 281 MODULE_LICENSE("GPL");
 282 MODULE_ALIAS("platform:wm8400-regulator");