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         { .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
  29 static 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
  39 static 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
  66 static 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
 104 static 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
 111 static 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
 124 static 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
 211 static 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 = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
 223                                        &config);
 224         if (IS_ERR(rdev))
 225                 return PTR_ERR(rdev);
 226
 227         platform_set_drvdata(pdev, rdev);
 228
 229         return 0;
 230 }
 231
 232 static struct platform_driver wm8400_regulator_driver = {
 233         .driver = {
 234                 .name = "wm8400-regulator",
 235         },
 236         .probe = wm8400_regulator_probe,
 237 };
 238
 239 /**
 240  * wm8400_register_regulator - enable software control of a WM8400 regulator
 241  *
 242  * This function enables software control of a WM8400 regulator via
 243  * the regulator API.  It is intended to be called from the
 244  * platform_init() callback of the WM8400 MFD driver.
 245  *
 246  * @param dev      The WM8400 device to operate on.
 247  * @param reg      The regulator to control.
 248  * @param initdata Regulator initdata for the regulator.
 249  */
 250 int wm8400_register_regulator(struct device *dev, int reg,
 251                               struct regulator_init_data *initdata)
 252 {
 253         struct wm8400 *wm8400 = dev_get_drvdata(dev);
 254
 255         if (wm8400->regulators[reg].name)
 256                 return -EBUSY;
 257
 258         initdata->driver_data = wm8400;
 259
 260         wm8400->regulators[reg].name = "wm8400-regulator";
 261         wm8400->regulators[reg].id = reg;
 262         wm8400->regulators[reg].dev.parent = dev;
 263         wm8400->regulators[reg].dev.platform_data = initdata;
 264
 265         return platform_device_register(&wm8400->regulators[reg]);
 266 }
 267 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 268
 269 static int __init wm8400_regulator_init(void)
 270 {
 271         return platform_driver_register(&wm8400_regulator_driver);
 272 }
 273 subsys_initcall(wm8400_regulator_init);
 274
 275 static void __exit wm8400_regulator_exit(void)
 276 {
 277         platform_driver_unregister(&wm8400_regulator_driver);
 278 }
 279 module_exit(wm8400_regulator_exit);
 280
 281 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 282 MODULE_DESCRIPTION("WM8400 regulator driver");
 283 MODULE_LICENSE("GPL");
 284 MODULE_ALIAS("platform:wm8400-regulator");