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 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
  34 static 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
  55 static 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
  65 static 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
  92 static 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
 130 static 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
 137 static 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
 150 static 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
 229 static int 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
 249 static int 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
 259 static struct platform_driver wm8400_regulator_driver = {
 260         .driver = {
 261                 .name = "wm8400-regulator",
 262         },
 263         .probe = wm8400_regulator_probe,
 264         .remove = 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  */
 278 int 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 }
 295 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 296
 297 static int __init wm8400_regulator_init(void)
 298 {
 299         return platform_driver_register(&wm8400_regulator_driver);
 300 }
 301 subsys_initcall(wm8400_regulator_init);
 302
 303 static void __exit wm8400_regulator_exit(void)
 304 {
 305         platform_driver_unregister(&wm8400_regulator_driver);
 306 }
 307 module_exit(wm8400_regulator_exit);
 308
 309 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 310 MODULE_DESCRIPTION("WM8400 regulator driver");
 311 MODULE_LICENSE("GPL");
 312 MODULE_ALIAS("platform:wm8400-regulator");