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(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 wm8400_ldo_list_voltage(dev, val);
  67 }
  68
  69 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
  70                                   int min_uV, int max_uV)
  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         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
  97                                WM8400_LDO1_VSEL_MASK, val);
  98 }
  99
 100 static struct regulator_ops wm8400_ldo_ops = {
 101         .is_enabled = wm8400_ldo_is_enabled,
 102         .enable = wm8400_ldo_enable,
 103         .disable = wm8400_ldo_disable,
 104         .list_voltage = wm8400_ldo_list_voltage,
 105         .get_voltage = wm8400_ldo_get_voltage,
 106         .set_voltage = wm8400_ldo_set_voltage,
 107 };
 108
 109 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
 110 {
 111         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 112         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 113         u16 val;
 114
 115         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 116         return (val & WM8400_DC1_ENA) != 0;
 117 }
 118
 119 static int wm8400_dcdc_enable(struct regulator_dev *dev)
 120 {
 121         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 122         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 123
 124         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 125                                WM8400_DC1_ENA, WM8400_DC1_ENA);
 126 }
 127
 128 static int wm8400_dcdc_disable(struct regulator_dev *dev)
 129 {
 130         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 131         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 132
 133         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 134                                WM8400_DC1_ENA, 0);
 135 }
 136
 137 static int wm8400_dcdc_list_voltage(struct regulator_dev *dev,
 138                                     unsigned selector)
 139 {
 140         if (selector > WM8400_DC1_VSEL_MASK)
 141                 return -EINVAL;
 142
 143         return 850000 + (selector * 25000);
 144 }
 145
 146 static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
 147 {
 148         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 149         u16 val;
 150         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 151
 152         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
 153         val &= WM8400_DC1_VSEL_MASK;
 154
 155         return 850000 + (25000 * val);
 156 }
 157
 158 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
 159                                   int min_uV, int max_uV)
 160 {
 161         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 162         u16 val;
 163         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 164
 165         if (min_uV < 850000)
 166                 return -EINVAL;
 167
 168         val = (min_uV - 825001) / 25000;
 169
 170         if (850000 + (25000 * val) > max_uV)
 171                 return -EINVAL;
 172         BUG_ON(850000 + (25000 * val) < min_uV);
 173
 174         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 175                                WM8400_DC1_VSEL_MASK, val);
 176 }
 177
 178 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
 179 {
 180         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 181         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 182         u16 data[2];
 183         int ret;
 184
 185         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
 186                                 data);
 187         if (ret != 0)
 188                 return 0;
 189
 190         /* Datasheet: hibernate */
 191         if (data[0] & WM8400_DC1_SLEEP)
 192                 return REGULATOR_MODE_STANDBY;
 193
 194         /* Datasheet: standby */
 195         if (!(data[0] & WM8400_DC1_ACTIVE))
 196                 return REGULATOR_MODE_IDLE;
 197
 198         /* Datasheet: active with or without force PWM */
 199         if (data[1] & WM8400_DC1_FRC_PWM)
 200                 return REGULATOR_MODE_FAST;
 201         else
 202                 return REGULATOR_MODE_NORMAL;
 203 }
 204
 205 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
 206 {
 207         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 208         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 209         int ret;
 210
 211         switch (mode) {
 212         case REGULATOR_MODE_FAST:
 213                 /* Datasheet: active with force PWM */
 214                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 215                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 216                 if (ret != 0)
 217                         return ret;
 218
 219                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 220                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 221                                        WM8400_DC1_ACTIVE);
 222
 223         case REGULATOR_MODE_NORMAL:
 224                 /* Datasheet: active */
 225                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 226                                       WM8400_DC1_FRC_PWM, 0);
 227                 if (ret != 0)
 228                         return ret;
 229
 230                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 231                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 232                                        WM8400_DC1_ACTIVE);
 233
 234         case REGULATOR_MODE_IDLE:
 235                 /* Datasheet: standby */
 236                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 237                                       WM8400_DC1_ACTIVE, 0);
 238                 if (ret != 0)
 239                         return ret;
 240                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 241                                        WM8400_DC1_SLEEP, 0);
 242
 243         default:
 244                 return -EINVAL;
 245         }
 246 }
 247
 248 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
 249                                                  int input_uV, int output_uV,
 250                                                  int load_uA)
 251 {
 252         return REGULATOR_MODE_NORMAL;
 253 }
 254
 255 static struct regulator_ops wm8400_dcdc_ops = {
 256         .is_enabled = wm8400_dcdc_is_enabled,
 257         .enable = wm8400_dcdc_enable,
 258         .disable = wm8400_dcdc_disable,
 259         .list_voltage = wm8400_dcdc_list_voltage,
 260         .get_voltage = wm8400_dcdc_get_voltage,
 261         .set_voltage = wm8400_dcdc_set_voltage,
 262         .get_mode = wm8400_dcdc_get_mode,
 263         .set_mode = wm8400_dcdc_set_mode,
 264         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
 265 };
 266
 267 static struct regulator_desc regulators[] = {
 268         {
 269                 .name = "LDO1",
 270                 .id = WM8400_LDO1,
 271                 .ops = &wm8400_ldo_ops,
 272                 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
 273                 .type = REGULATOR_VOLTAGE,
 274                 .owner = THIS_MODULE,
 275         },
 276         {
 277                 .name = "LDO2",
 278                 .id = WM8400_LDO2,
 279                 .ops = &wm8400_ldo_ops,
 280                 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
 281                 .type = REGULATOR_VOLTAGE,
 282                 .owner = THIS_MODULE,
 283         },
 284         {
 285                 .name = "LDO3",
 286                 .id = WM8400_LDO3,
 287                 .ops = &wm8400_ldo_ops,
 288                 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
 289                 .type = REGULATOR_VOLTAGE,
 290                 .owner = THIS_MODULE,
 291         },
 292         {
 293                 .name = "LDO4",
 294                 .id = WM8400_LDO4,
 295                 .ops = &wm8400_ldo_ops,
 296                 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
 297                 .type = REGULATOR_VOLTAGE,
 298                 .owner = THIS_MODULE,
 299         },
 300         {
 301                 .name = "DCDC1",
 302                 .id = WM8400_DCDC1,
 303                 .ops = &wm8400_dcdc_ops,
 304                 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
 305                 .type = REGULATOR_VOLTAGE,
 306                 .owner = THIS_MODULE,
 307         },
 308         {
 309                 .name = "DCDC2",
 310                 .id = WM8400_DCDC2,
 311                 .ops = &wm8400_dcdc_ops,
 312                 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
 313                 .type = REGULATOR_VOLTAGE,
 314                 .owner = THIS_MODULE,
 315         },
 316 };
 317
 318 static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
 319 {
 320         struct regulator_dev *rdev;
 321
 322         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 323                 pdev->dev.platform_data, pdev->dev.driver_data);
 324
 325         if (IS_ERR(rdev))
 326                 return PTR_ERR(rdev);
 327
 328         return 0;
 329 }
 330
 331 static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
 332 {
 333         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 334
 335         regulator_unregister(rdev);
 336
 337         return 0;
 338 }
 339
 340 static struct platform_driver wm8400_regulator_driver = {
 341         .driver = {
 342                 .name = "wm8400-regulator",
 343         },
 344         .probe = wm8400_regulator_probe,
 345         .remove = __devexit_p(wm8400_regulator_remove),
 346 };
 347
 348 /**
 349  * wm8400_register_regulator - enable software control of a WM8400 regulator
 350  *
 351  * This function enables software control of a WM8400 regulator via
 352  * the regulator API.  It is intended to be called from the
 353  * platform_init() callback of the WM8400 MFD driver.
 354  *
 355  * @param dev      The WM8400 device to operate on.
 356  * @param reg      The regulator to control.
 357  * @param initdata Regulator initdata for the regulator.
 358  */
 359 int wm8400_register_regulator(struct device *dev, int reg,
 360                               struct regulator_init_data *initdata)
 361 {
 362         struct wm8400 *wm8400 = dev->driver_data;
 363
 364         if (wm8400->regulators[reg].name)
 365                 return -EBUSY;
 366
 367         initdata->driver_data = wm8400;
 368
 369         wm8400->regulators[reg].name = "wm8400-regulator";
 370         wm8400->regulators[reg].id = reg;
 371         wm8400->regulators[reg].dev.parent = dev;
 372         wm8400->regulators[reg].dev.driver_data = wm8400;
 373         wm8400->regulators[reg].dev.platform_data = initdata;
 374
 375         return platform_device_register(&wm8400->regulators[reg]);
 376 }
 377 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
 378
 379 static int __init wm8400_regulator_init(void)
 380 {
 381         return platform_driver_register(&wm8400_regulator_driver);
 382 }
 383 module_init(wm8400_regulator_init);
 384
 385 static void __exit wm8400_regulator_exit(void)
 386 {
 387         platform_driver_unregister(&wm8400_regulator_driver);
 388 }
 389 module_exit(wm8400_regulator_exit);
 390
 391 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 392 MODULE_DESCRIPTION("WM8400 regulator driver");
 393 MODULE_LICENSE("GPL");
 394 MODULE_ALIAS("platform:wm8400-regulator");