drivers/regulator/pcf50633-regulator.c

   1 /* NXP PCF50633 PMIC Driver
   2  *
   3  * (C) 2006-2008 by Openmoko, Inc.
   4  * Author: Balaji Rao <balajirrao@openmoko.org>
   5  * All rights reserved.
   6  *
   7  * Broken down from monstrous PCF50633 driver mainly by
   8  * Harald Welte and Andy Green and Werner Almesberger
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/device.h>
  21 #include <linux/err.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/mfd/pcf50633/core.h>
  25 #include <linux/mfd/pcf50633/pmic.h>
  26
  27 #define PCF50633_REGULATOR(_name, _id, _n)              \
  28         {                                       \
  29                 .name = _name,                  \
  30                 .id = _id,                      \
  31                 .ops = &pcf50633_regulator_ops, \
  32                 .n_voltages = _n, \
  33                 .type = REGULATOR_VOLTAGE,      \
  34                 .owner = THIS_MODULE,           \
  35         }
  36
  37 static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
  38         [PCF50633_REGULATOR_AUTO]       = PCF50633_REG_AUTOOUT,
  39         [PCF50633_REGULATOR_DOWN1]      = PCF50633_REG_DOWN1OUT,
  40         [PCF50633_REGULATOR_DOWN2]      = PCF50633_REG_DOWN2OUT,
  41         [PCF50633_REGULATOR_MEMLDO]     = PCF50633_REG_MEMLDOOUT,
  42         [PCF50633_REGULATOR_LDO1]       = PCF50633_REG_LDO1OUT,
  43         [PCF50633_REGULATOR_LDO2]       = PCF50633_REG_LDO2OUT,
  44         [PCF50633_REGULATOR_LDO3]       = PCF50633_REG_LDO3OUT,
  45         [PCF50633_REGULATOR_LDO4]       = PCF50633_REG_LDO4OUT,
  46         [PCF50633_REGULATOR_LDO5]       = PCF50633_REG_LDO5OUT,
  47         [PCF50633_REGULATOR_LDO6]       = PCF50633_REG_LDO6OUT,
  48         [PCF50633_REGULATOR_HCLDO]      = PCF50633_REG_HCLDOOUT,
  49 };
  50
  51 /* Bits from voltage value */
  52 static u8 auto_voltage_bits(unsigned int millivolts)
  53 {
  54         if (millivolts < 1800)
  55                 return 0;
  56         if (millivolts > 3800)
  57                 return 0xff;
  58
  59         millivolts -= 625;
  60
  61         return millivolts / 25;
  62 }
  63
  64 static u8 down_voltage_bits(unsigned int millivolts)
  65 {
  66         if (millivolts < 625)
  67                 return 0;
  68         else if (millivolts > 3000)
  69                 return 0xff;
  70
  71         millivolts -= 625;
  72
  73         return millivolts / 25;
  74 }
  75
  76 static u8 ldo_voltage_bits(unsigned int millivolts)
  77 {
  78         if (millivolts < 900)
  79                 return 0;
  80         else if (millivolts > 3600)
  81                 return 0x1f;
  82
  83         millivolts -= 900;
  84         return millivolts / 100;
  85 }
  86
  87 /* Obtain voltage value from bits */
  88 static unsigned int auto_voltage_value(u8 bits)
  89 {
  90         if (bits < 0x2f)
  91                 return 0;
  92
  93         return 625 + (bits * 25);
  94 }
  95
  96
  97 static unsigned int down_voltage_value(u8 bits)
  98 {
  99         return 625 + (bits * 25);
 100 }
 101
 102
 103 static unsigned int ldo_voltage_value(u8 bits)
 104 {
 105         bits &= 0x1f;
 106
 107         return 900 + (bits * 100);
 108 }
 109
 110 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 111                                           int min_uV, int max_uV,
 112                                           unsigned *selector)
 113 {
 114         struct pcf50633 *pcf;
 115         int regulator_id, millivolts;
 116         u8 volt_bits, regnr;
 117
 118         pcf = rdev_get_drvdata(rdev);
 119
 120         regulator_id = rdev_get_id(rdev);
 121         if (regulator_id >= PCF50633_NUM_REGULATORS)
 122                 return -EINVAL;
 123
 124         millivolts = min_uV / 1000;
 125
 126         regnr = pcf50633_regulator_registers[regulator_id];
 127
 128         switch (regulator_id) {
 129         case PCF50633_REGULATOR_AUTO:
 130                 volt_bits = auto_voltage_bits(millivolts);
 131                 break;
 132         case PCF50633_REGULATOR_DOWN1:
 133                 volt_bits = down_voltage_bits(millivolts);
 134                 break;
 135         case PCF50633_REGULATOR_DOWN2:
 136                 volt_bits = down_voltage_bits(millivolts);
 137                 break;
 138         case PCF50633_REGULATOR_LDO1:
 139         case PCF50633_REGULATOR_LDO2:
 140         case PCF50633_REGULATOR_LDO3:
 141         case PCF50633_REGULATOR_LDO4:
 142         case PCF50633_REGULATOR_LDO5:
 143         case PCF50633_REGULATOR_LDO6:
 144         case PCF50633_REGULATOR_HCLDO:
 145         case PCF50633_REGULATOR_MEMLDO:
 146                 volt_bits = ldo_voltage_bits(millivolts);
 147                 break;
 148         default:
 149                 return -EINVAL;
 150         }
 151
 152         *selector = volt_bits;
 153
 154         return pcf50633_reg_write(pcf, regnr, volt_bits);
 155 }
 156
 157 static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
 158                                                 u8 bits)
 159 {
 160         int millivolts;
 161
 162         switch (id) {
 163         case PCF50633_REGULATOR_AUTO:
 164                 millivolts = auto_voltage_value(bits);
 165                 break;
 166         case PCF50633_REGULATOR_DOWN1:
 167                 millivolts = down_voltage_value(bits);
 168                 break;
 169         case PCF50633_REGULATOR_DOWN2:
 170                 millivolts = down_voltage_value(bits);
 171                 break;
 172         case PCF50633_REGULATOR_LDO1:
 173         case PCF50633_REGULATOR_LDO2:
 174         case PCF50633_REGULATOR_LDO3:
 175         case PCF50633_REGULATOR_LDO4:
 176         case PCF50633_REGULATOR_LDO5:
 177         case PCF50633_REGULATOR_LDO6:
 178         case PCF50633_REGULATOR_HCLDO:
 179         case PCF50633_REGULATOR_MEMLDO:
 180                 millivolts = ldo_voltage_value(bits);
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         return millivolts * 1000;
 187 }
 188
 189 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 190 {
 191         struct pcf50633 *pcf;
 192         int regulator_id;
 193         u8 volt_bits, regnr;
 194
 195         pcf = rdev_get_drvdata(rdev);
 196
 197         regulator_id = rdev_get_id(rdev);
 198         if (regulator_id >= PCF50633_NUM_REGULATORS)
 199                 return -EINVAL;
 200
 201         regnr = pcf50633_regulator_registers[regulator_id];
 202
 203         volt_bits = pcf50633_reg_read(pcf, regnr);
 204
 205         return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
 206 }
 207
 208 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 209                                                 unsigned int index)
 210 {
 211         struct pcf50633 *pcf;
 212         int regulator_id;
 213
 214         pcf = rdev_get_drvdata(rdev);
 215
 216         regulator_id = rdev_get_id(rdev);
 217
 218         switch (regulator_id) {
 219         case PCF50633_REGULATOR_AUTO:
 220                 index += 0x2f;
 221                 break;
 222         default:
 223                 break;
 224         }
 225
 226         return pcf50633_regulator_voltage_value(regulator_id, index);
 227 }
 228
 229 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 230 {
 231         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 232         int regulator_id;
 233         u8 regnr;
 234
 235         regulator_id = rdev_get_id(rdev);
 236         if (regulator_id >= PCF50633_NUM_REGULATORS)
 237                 return -EINVAL;
 238
 239         /* The *ENA register is always one after the *OUT register */
 240         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 241
 242         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 243                                                        PCF50633_REGULATOR_ON);
 244 }
 245
 246 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 247 {
 248         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 249         int regulator_id;
 250         u8 regnr;
 251
 252         regulator_id = rdev_get_id(rdev);
 253         if (regulator_id >= PCF50633_NUM_REGULATORS)
 254                 return -EINVAL;
 255
 256         /* the *ENA register is always one after the *OUT register */
 257         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 258
 259         return pcf50633_reg_set_bit_mask(pcf, regnr,
 260                                         PCF50633_REGULATOR_ON, 0);
 261 }
 262
 263 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 264 {
 265         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 266         int regulator_id = rdev_get_id(rdev);
 267         u8 regnr;
 268
 269         regulator_id = rdev_get_id(rdev);
 270         if (regulator_id >= PCF50633_NUM_REGULATORS)
 271                 return -EINVAL;
 272
 273         /* the *ENA register is always one after the *OUT register */
 274         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 275
 276         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 277 }
 278
 279 static struct regulator_ops pcf50633_regulator_ops = {
 280         .set_voltage = pcf50633_regulator_set_voltage,
 281         .get_voltage = pcf50633_regulator_get_voltage,
 282         .list_voltage = pcf50633_regulator_list_voltage,
 283         .enable = pcf50633_regulator_enable,
 284         .disable = pcf50633_regulator_disable,
 285         .is_enabled = pcf50633_regulator_is_enabled,
 286 };
 287
 288 static struct regulator_desc regulators[] = {
 289         [PCF50633_REGULATOR_AUTO] =
 290                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 81),
 291         [PCF50633_REGULATOR_DOWN1] =
 292                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 96),
 293         [PCF50633_REGULATOR_DOWN2] =
 294                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 96),
 295         [PCF50633_REGULATOR_LDO1] =
 296                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 28),
 297         [PCF50633_REGULATOR_LDO2] =
 298                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 28),
 299         [PCF50633_REGULATOR_LDO3] =
 300                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 28),
 301         [PCF50633_REGULATOR_LDO4] =
 302                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 28),
 303         [PCF50633_REGULATOR_LDO5] =
 304                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 28),
 305         [PCF50633_REGULATOR_LDO6] =
 306                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 28),
 307         [PCF50633_REGULATOR_HCLDO] =
 308                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 28),
 309         [PCF50633_REGULATOR_MEMLDO] =
 310                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 28),
 311 };
 312
 313 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 314 {
 315         struct regulator_dev *rdev;
 316         struct pcf50633 *pcf;
 317
 318         /* Already set by core driver */
 319         pcf = dev_to_pcf50633(pdev->dev.parent);
 320
 321         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 322                                   pdev->dev.platform_data, pcf, NULL);
 323         if (IS_ERR(rdev))
 324                 return PTR_ERR(rdev);
 325
 326         platform_set_drvdata(pdev, rdev);
 327
 328         if (pcf->pdata->regulator_registered)
 329                 pcf->pdata->regulator_registered(pcf, pdev->id);
 330
 331         return 0;
 332 }
 333
 334 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 335 {
 336         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 337
 338         platform_set_drvdata(pdev, NULL);
 339         regulator_unregister(rdev);
 340
 341         return 0;
 342 }
 343
 344 static struct platform_driver pcf50633_regulator_driver = {
 345         .driver = {
 346                 .name = "pcf50633-regltr",
 347         },
 348         .probe = pcf50633_regulator_probe,
 349         .remove = __devexit_p(pcf50633_regulator_remove),
 350 };
 351
 352 static int __init pcf50633_regulator_init(void)
 353 {
 354         return platform_driver_register(&pcf50633_regulator_driver);
 355 }
 356 subsys_initcall(pcf50633_regulator_init);
 357
 358 static void __exit pcf50633_regulator_exit(void)
 359 {
 360         platform_driver_unregister(&pcf50633_regulator_driver);
 361 }
 362 module_exit(pcf50633_regulator_exit);
 363
 364 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 365 MODULE_DESCRIPTION("PCF50633 regulator driver");
 366 MODULE_LICENSE("GPL");
 367 MODULE_ALIAS("platform:pcf50633-regulator");