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_list_voltage(struct regulator_dev *dev,
  47                                    unsigned selector)
  48 {
  49         if (selector > WM8400_LDO1_VSEL_MASK)
  50                 return -EINVAL;
  51
  52         if (selector < 15)
  53                 return 900000 + (selector * 50000);
  54         else
  55                 return 1600000 + ((selector - 14) * 100000);
  56 }
  57
  58 static int wm8400_ldo_get_voltage_sel(struct regulator_dev *dev)
  59 {
  60         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  61         u16 val;
  62
  63         val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
  64         val &= WM8400_LDO1_VSEL_MASK;
  65
  66         return val;
  67 }
  68
  69 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
  70                                   int min_uV, int max_uV, unsigned *selector)
  71 {
  72         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
  73         u16 val;
  74
  75         if (min_uV < 900000 || min_uV > 3300000)
  76                 return -EINVAL;
  77
  78         if (min_uV < 1700000) {
  79                 /* Steps of 50mV from 900mV;  */
  80                 val = (min_uV - 850001) / 50000;
  81
  82                 if ((val * 50000) + 900000 > max_uV)
  83                         return -EINVAL;
  84                 BUG_ON((val * 50000) + 900000 < min_uV);
  85         } else {
  86                 /* Steps of 100mV from 1700mV */
  87                 val = ((min_uV - 1600001) / 100000);
  88
  89                 if ((val * 100000) + 1700000 > max_uV)
  90                         return -EINVAL;
  91                 BUG_ON((val * 100000) + 1700000 < min_uV);
  92
  93                 val += 0xf;
  94         }
  95
  96         *selector = val;
  97
  98         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
  99                                WM8400_LDO1_VSEL_MASK, val);
 100 }
 101
 102 static struct regulator_ops wm8400_ldo_ops = {
 103         .is_enabled = wm8400_ldo_is_enabled,
 104         .enable = wm8400_ldo_enable,
 105         .disable = wm8400_ldo_disable,
 106         .list_voltage = wm8400_ldo_list_voltage,
 107         .get_voltage_sel = wm8400_ldo_get_voltage_sel,
 108         .set_voltage = wm8400_ldo_set_voltage,
 109 };
 110
 111 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
 112 {
 113         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 114         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 115         u16 val;
 116
 117         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 118         return (val & WM8400_DC1_ENA) != 0;
 119 }
 120
 121 static int wm8400_dcdc_enable(struct regulator_dev *dev)
 122 {
 123         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 124         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 125
 126         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 127                                WM8400_DC1_ENA, WM8400_DC1_ENA);
 128 }
 129
 130 static int wm8400_dcdc_disable(struct regulator_dev *dev)
 131 {
 132         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 133         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 134
 135         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 136                                WM8400_DC1_ENA, 0);
 137 }
 138
 139 static int wm8400_dcdc_list_voltage(struct regulator_dev *dev,
 140                                     unsigned selector)
 141 {
 142         if (selector > WM8400_DC1_VSEL_MASK)
 143                 return -EINVAL;
 144
 145         return 850000 + (selector * 25000);
 146 }
 147
 148 static int wm8400_dcdc_get_voltage_sel(struct regulator_dev *dev)
 149 {
 150         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 151         u16 val;
 152         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 153
 154         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 155         val &= WM8400_DC1_VSEL_MASK;
 156
 157         return val;
 158 }
 159
 160 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
 161                                    int min_uV, int max_uV, unsigned *selector)
 162 {
 163         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 164         u16 val;
 165         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 166
 167         if (min_uV < 850000)
 168                 return -EINVAL;
 169
 170         val = (min_uV - 825001) / 25000;
 171
 172         if (850000 + (25000 * val) > max_uV)
 173                 return -EINVAL;
 174         BUG_ON(850000 + (25000 * val) < min_uV);
 175
 176         *selector = val;
 177
 178         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 179                                WM8400_DC1_VSEL_MASK, val);
 180 }
 181
 182 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
 183 {
 184         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 185         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 186         u16 data[2];
 187         int ret;
 188
 189         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
 190                                 data);
 191         if (ret != 0)
 192                 return 0;
 193
 194         /* Datasheet: hibernate */
 195         if (data[0] & WM8400_DC1_SLEEP)
 196                 return REGULATOR_MODE_STANDBY;
 197
 198         /* Datasheet: standby */
 199         if (!(data[0] & WM8400_DC1_ACTIVE))
 200                 return REGULATOR_MODE_IDLE;
 201
 202         /* Datasheet: active with or without force PWM */
 203         if (data[1] & WM8400_DC1_FRC_PWM)
 204                 return REGULATOR_MODE_FAST;
 205         else
 206                 return REGULATOR_MODE_NORMAL;
 207 }
 208
 209 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
 210 {
 211         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 212         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 213         int ret;
 214
 215         switch (mode) {
 216         case REGULATOR_MODE_FAST:
 217                 /* Datasheet: active with force PWM */
 218                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 219                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 220                 if (ret != 0)
 221                         return ret;
 222
 223                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 224                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 225                                        WM8400_DC1_ACTIVE);
 226
 227         case REGULATOR_MODE_NORMAL:
 228                 /* Datasheet: active */
 229                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 230                                       WM8400_DC1_FRC_PWM, 0);
 231                 if (ret != 0)
 232                         return ret;
 233
 234                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 235                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 236                                        WM8400_DC1_ACTIVE);
 237
 238         case REGULATOR_MODE_IDLE:
 239                 /* Datasheet: standby */
 240                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 241                                       WM8400_DC1_ACTIVE, 0);
 242                 if (ret != 0)
 243                         return ret;
 244                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 245                                        WM8400_DC1_SLEEP, 0);
 246
 247         default:
 248                 return -EINVAL;
 249         }
 250 }
 251
 252 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 253                                                  int input_uV, int output_uV,
 254                                                  int load_uA)
 255 {
 256         return REGULATOR_MODE_NORMAL;
 257 }
 258
 259 static struct regulator_ops wm8400_dcdc_ops = {
 260         .is_enabled = wm8400_dcdc_is_enabled,
 261         .enable = wm8400_dcdc_enable,
 262         .disable = wm8400_dcdc_disable,
 263         .list_voltage = wm8400_dcdc_list_voltage,
 264         .get_voltage_sel = wm8400_dcdc_get_voltage_sel,
 265         .set_voltage = wm8400_dcdc_set_voltage,
 266         .get_mode = wm8400_dcdc_get_mode,
 267         .set_mode = wm8400_dcdc_set_mode,
 268         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 269 };
 270
 271 static struct regulator_desc regulators[] = {
 272         {
 273                 .name = "LDO1",
 274                 .id = WM8400_LDO1,
 275                 .ops = &wm8400_ldo_ops,
 276                 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 277                 .type = REGULATOR_VOLTAGE,
 278                 .owner = THIS_MODULE,
 279         },
 280         {
 281                 .name = "LDO2",
 282                 .id = WM8400_LDO2,
 283                 .ops = &wm8400_ldo_ops,
 284                 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 285                 .type = REGULATOR_VOLTAGE,
 286                 .owner = THIS_MODULE,
 287         },
 288         {
 289                 .name = "LDO3",
 290                 .id = WM8400_LDO3,
 291                 .ops = &wm8400_ldo_ops,
 292                 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 293                 .type = REGULATOR_VOLTAGE,
 294                 .owner = THIS_MODULE,
 295         },
 296         {
 297                 .name = "LDO4",
 298                 .id = WM8400_LDO4,
 299                 .ops = &wm8400_ldo_ops,
 300                 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 301                 .type = REGULATOR_VOLTAGE,
 302                 .owner = THIS_MODULE,
 303         },
 304         {
 305                 .name = "DCDC1",
 306                 .id = WM8400_DCDC1,
 307                 .ops = &wm8400_dcdc_ops,
 308                 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 309                 .type = REGULATOR_VOLTAGE,
 310                 .owner = THIS_MODULE,
 311         },
 312         {
 313                 .name = "DCDC2",
 314                 .id = WM8400_DCDC2,
 315                 .ops = &wm8400_dcdc_ops,
 316                 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 317                 .type = REGULATOR_VOLTAGE,
 318                 .owner = THIS_MODULE,
 319         },
 320 };
 321
 322 static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
 323 {
 324         struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 325         struct regulator_dev *rdev;
 326
 327         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 328                                   pdev->dev.platform_data, wm8400);
 329
 330         if (IS_ERR(rdev))
 331                 return PTR_ERR(rdev);
 332
 333         platform_set_drvdata(pdev, rdev);
 334
 335         return 0;
 336 }
 337
 338 static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
 339 {
 340         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 341
 342         platform_set_drvdata(pdev, NULL);
 343         regulator_unregister(rdev);
 344
 345         return 0;
 346 }
 347
 348 static struct platform_driver wm8400_regulator_driver = {
 349         .driver = {
 350                 .name = "wm8400-regulator",
 351         },
 352         .probe = wm8400_regulator_probe,
 353         .remove = __devexit_p(wm8400_regulator_remove),
 354 };
 355
 356 /**
 357  * wm8400_register_regulator - enable software control of a WM8400 regulator
 358  *
 359  * This function enables software control of a WM8400 regulator via
 360  * the regulator API.  It is intended to be called from the
 361  * platform_init() callback of the WM8400 MFD driver.
 362  *
 363  * @param dev      The WM8400 device to operate on.
 364  * @param reg      The regulator to control.
 365  * @param initdata Regulator initdata for the regulator.
 366  */
 367 int wm8400_register_regulator(struct device *dev, int reg,
 368                               struct regulator_init_data *initdata)
 369 {
 370         struct wm8400 *wm8400 = dev_get_drvdata(dev);
 371
 372         if (wm8400->regulators[reg].name)
 373                 return -EBUSY;
 374
 375         initdata->driver_data = wm8400;
 376
 377         wm8400->regulators[reg].name = "wm8400-regulator";
 378         wm8400->regulators[reg].id = reg;
 379         wm8400->regulators[reg].dev.parent = dev;
 380         wm8400->regulators[reg].dev.platform_data = initdata;
 381
 382         return platform_device_register(&wm8400->regulators[reg]);
 383 }
 384 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 385
 386 static int __init wm8400_regulator_init(void)
 387 {
 388         return platform_driver_register(&wm8400_regulator_driver);
 389 }
 390 subsys_initcall(wm8400_regulator_init);
 391
 392 static void __exit wm8400_regulator_exit(void)
 393 {
 394         platform_driver_unregister(&wm8400_regulator_driver);
 395 }
 396 module_exit(wm8400_regulator_exit);
 397
 398 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 399 MODULE_DESCRIPTION("WM8400 regulator driver");
 400 MODULE_LICENSE("GPL");
 401 MODULE_ALIAS("platform:wm8400-regulator");