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/regulator/driver.h>
  19 #include <linux/mfd/wm8400-private.h>
  20
  21 static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
  22 {
  23         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  24         u16 val;
  25
  26         val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
  27         return (val & WM8400_LDO1_ENA) != 0;
  28 }
  29
  30 static int wm8400_ldo_enable(struct regulator_dev *dev)
  31 {
  32         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  33
  34         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
  35                                WM8400_LDO1_ENA, WM8400_LDO1_ENA);
  36 }
  37
  38 static int wm8400_ldo_disable(struct regulator_dev *dev)
  39 {
  40         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  41
  42         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
  43                                WM8400_LDO1_ENA, 0);
  44 }
  45
  46 static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
  47 {
  48         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  49         u16 val;
  50
  51         val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
  52         val &= WM8400_LDO1_VSEL_MASK;
  53
  54         if (val < 15)
  55                 return 900000 + (val * 50000);
  56         else
  57                 return 1600000 + ((val - 14) * 100000);
  58 }
  59
  60 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
  61                                   int min_uV, int max_uV)
  62 {
  63         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  64         u16 val;
  65
  66         if (min_uV < 900000 || min_uV > 3300000)
  67                 return -EINVAL;
  68
  69         if (min_uV < 1700000) {
  70                 /* Steps of 50mV from 900mV;  */
  71                 val = (min_uV - 850001) / 50000;
  72
  73                 if ((val * 50000) + 900000 > max_uV)
  74                         return -EINVAL;
  75                 BUG_ON((val * 50000) + 900000 < min_uV);
  76         } else {
  77                 /* Steps of 100mV from 1700mV */
  78                 val = ((min_uV - 1600001) / 100000);
  79
  80                 if ((val * 100000) + 1700000 > max_uV)
  81                         return -EINVAL;
  82                 BUG_ON((val * 100000) + 1700000 < min_uV);
  83
  84                 val += 0xf;
  85         }
  86
  87         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
  88                                WM8400_LDO1_VSEL_MASK, val);
  89 }
  90
  91 static struct regulator_ops wm8400_ldo_ops = {
  92         .is_enabled = wm8400_ldo_is_enabled,
  93         .enable = wm8400_ldo_enable,
  94         .disable = wm8400_ldo_disable,
  95         .get_voltage = wm8400_ldo_get_voltage,
  96         .set_voltage = wm8400_ldo_set_voltage,
  97 };
  98
  99 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
 100 {
 101         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 102         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 103         u16 val;
 104
 105         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 106         return (val & WM8400_DC1_ENA) != 0;
 107 }
 108
 109 static int wm8400_dcdc_enable(struct regulator_dev *dev)
 110 {
 111         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 112         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 113
 114         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 115                                WM8400_DC1_ENA, WM8400_DC1_ENA);
 116 }
 117
 118 static int wm8400_dcdc_disable(struct regulator_dev *dev)
 119 {
 120         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 121         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 122
 123         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 124                                WM8400_DC1_ENA, 0);
 125 }
 126
 127 static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
 128 {
 129         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 130         u16 val;
 131         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 132
 133         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 134         val &= WM8400_DC1_VSEL_MASK;
 135
 136         return 850000 + (25000 * val);
 137 }
 138
 139 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
 140                                   int min_uV, int max_uV)
 141 {
 142         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 143         u16 val;
 144         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 145
 146         if (min_uV < 850000)
 147                 return -EINVAL;
 148
 149         val = (min_uV - 825001) / 25000;
 150
 151         if (850000 + (25000 * val) > max_uV)
 152                 return -EINVAL;
 153         BUG_ON(850000 + (25000 * val) < min_uV);
 154
 155         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 156                                WM8400_DC1_VSEL_MASK, val);
 157 }
 158
 159 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
 160 {
 161         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 162         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 163         u16 data[2];
 164         int ret;
 165
 166         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
 167                                 data);
 168         if (ret != 0)
 169                 return 0;
 170
 171         /* Datasheet: hibernate */
 172         if (data[0] & WM8400_DC1_SLEEP)
 173                 return REGULATOR_MODE_STANDBY;
 174
 175         /* Datasheet: standby */
 176         if (!(data[0] & WM8400_DC1_ACTIVE))
 177                 return REGULATOR_MODE_IDLE;
 178
 179         /* Datasheet: active with or without force PWM */
 180         if (data[1] & WM8400_DC1_FRC_PWM)
 181                 return REGULATOR_MODE_FAST;
 182         else
 183                 return REGULATOR_MODE_NORMAL;
 184 }
 185
 186 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
 187 {
 188         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 189         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 190         int ret;
 191
 192         switch (mode) {
 193         case REGULATOR_MODE_FAST:
 194                 /* Datasheet: active with force PWM */
 195                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 196                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 197                 if (ret != 0)
 198                         return ret;
 199
 200                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 201                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 202                                        WM8400_DC1_ACTIVE);
 203
 204         case REGULATOR_MODE_NORMAL:
 205                 /* Datasheet: active */
 206                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 207                                       WM8400_DC1_FRC_PWM, 0);
 208                 if (ret != 0)
 209                         return ret;
 210
 211                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 212                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 213                                        WM8400_DC1_ACTIVE);
 214
 215         case REGULATOR_MODE_IDLE:
 216                 /* Datasheet: standby */
 217                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 218                                       WM8400_DC1_ACTIVE, 0);
 219                 if (ret != 0)
 220                         return ret;
 221                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 222                                        WM8400_DC1_SLEEP, 0);
 223
 224         default:
 225                 return -EINVAL;
 226         }
 227 }
 228
 229 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 230                                                  int input_uV, int output_uV,
 231                                                  int load_uA)
 232 {
 233         return REGULATOR_MODE_NORMAL;
 234 }
 235
 236 static struct regulator_ops wm8400_dcdc_ops = {
 237         .is_enabled = wm8400_dcdc_is_enabled,
 238         .enable = wm8400_dcdc_enable,
 239         .disable = wm8400_dcdc_disable,
 240         .get_voltage = wm8400_dcdc_get_voltage,
 241         .set_voltage = wm8400_dcdc_set_voltage,
 242         .get_mode = wm8400_dcdc_get_mode,
 243         .set_mode = wm8400_dcdc_set_mode,
 244         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 245 };
 246
 247 static struct regulator_desc regulators[] = {
 248         {
 249                 .name = "LDO1",
 250                 .id = WM8400_LDO1,
 251                 .ops = &wm8400_ldo_ops,
 252                 .type = REGULATOR_VOLTAGE,
 253                 .owner = THIS_MODULE,
 254         },
 255         {
 256                 .name = "LDO2",
 257                 .id = WM8400_LDO2,
 258                 .ops = &wm8400_ldo_ops,
 259                 .type = REGULATOR_VOLTAGE,
 260                 .owner = THIS_MODULE,
 261         },
 262         {
 263                 .name = "LDO3",
 264                 .id = WM8400_LDO3,
 265                 .ops = &wm8400_ldo_ops,
 266                 .type = REGULATOR_VOLTAGE,
 267                 .owner = THIS_MODULE,
 268         },
 269         {
 270                 .name = "LDO4",
 271                 .id = WM8400_LDO4,
 272                 .ops = &wm8400_ldo_ops,
 273                 .type = REGULATOR_VOLTAGE,
 274                 .owner = THIS_MODULE,
 275         },
 276         {
 277                 .name = "DCDC1",
 278                 .id = WM8400_DCDC1,
 279                 .ops = &wm8400_dcdc_ops,
 280                 .type = REGULATOR_VOLTAGE,
 281                 .owner = THIS_MODULE,
 282         },
 283         {
 284                 .name = "DCDC2",
 285                 .id = WM8400_DCDC2,
 286                 .ops = &wm8400_dcdc_ops,
 287                 .type = REGULATOR_VOLTAGE,
 288                 .owner = THIS_MODULE,
 289         },
 290 };
 291
 292 static int __init wm8400_regulator_probe(struct platform_device *pdev)
 293 {
 294         struct regulator_dev *rdev;
 295
 296         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 297                 pdev->dev.driver_data);
 298
 299         if (IS_ERR(rdev))
 300                 return PTR_ERR(rdev);
 301
 302         return 0;
 303 }
 304
 305 static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
 306 {
 307         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 308
 309         regulator_unregister(rdev);
 310
 311         return 0;
 312 }
 313
 314 static struct platform_driver wm8400_regulator_driver = {
 315         .driver = {
 316                 .name = "wm8400-regulator",
 317         },
 318         .probe = wm8400_regulator_probe,
 319         .remove = __devexit_p(wm8400_regulator_remove),
 320 };
 321
 322 /**
 323  * wm8400_register_regulator - enable software control of a WM8400 regulator
 324  *
 325  * This function enables software control of a WM8400 regulator via
 326  * the regulator API.  It is intended to be called from the
 327  * platform_init() callback of the WM8400 MFD driver.
 328  *
 329  * @param dev      The WM8400 device to operate on.
 330  * @param reg      The regulator to control.
 331  * @param initdata Regulator initdata for the regulator.
 332  */
 333 int wm8400_register_regulator(struct device *dev, int reg,
 334                               struct regulator_init_data *initdata)
 335 {
 336         struct wm8400 *wm8400 = dev->driver_data;
 337
 338         if (wm8400->regulators[reg].name)
 339                 return -EBUSY;
 340
 341         initdata->driver_data = wm8400;
 342
 343         wm8400->regulators[reg].name = "wm8400-regulator";
 344         wm8400->regulators[reg].id = reg;
 345         wm8400->regulators[reg].dev.parent = dev;
 346         wm8400->regulators[reg].dev.driver_data = wm8400;
 347         wm8400->regulators[reg].dev.platform_data = initdata;
 348
 349         return platform_device_register(&wm8400->regulators[reg]);
 350 }
 351 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 352
 353 static int __init wm8400_regulator_init(void)
 354 {
 355         return platform_driver_register(&wm8400_regulator_driver);
 356 }
 357 module_init(wm8400_regulator_init);
 358
 359 static void __exit wm8400_regulator_exit(void)
 360 {
 361         platform_driver_unregister(&wm8400_regulator_driver);
 362 }
 363 module_exit(wm8400_regulator_exit);
 364
 365 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 366 MODULE_DESCRIPTION("WM8400 regulator driver");
 367 MODULE_LICENSE("GPL");
 368 MODULE_ALIAS("platform:wm8400-regulator");