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 {
 113         struct pcf50633 *pcf;
 114         int regulator_id, millivolts;
 115         u8 volt_bits, regnr;
 116
 117         pcf = rdev_get_drvdata(rdev);
 118
 119         regulator_id = rdev_get_id(rdev);
 120         if (regulator_id >= PCF50633_NUM_REGULATORS)
 121                 return -EINVAL;
 122
 123         millivolts = min_uV / 1000;
 124
 125         regnr = pcf50633_regulator_registers[regulator_id];
 126
 127         switch (regulator_id) {
 128         case PCF50633_REGULATOR_AUTO:
 129                 volt_bits = auto_voltage_bits(millivolts);
 130                 break;
 131         case PCF50633_REGULATOR_DOWN1:
 132                 volt_bits = down_voltage_bits(millivolts);
 133                 break;
 134         case PCF50633_REGULATOR_DOWN2:
 135                 volt_bits = down_voltage_bits(millivolts);
 136                 break;
 137         case PCF50633_REGULATOR_LDO1:
 138         case PCF50633_REGULATOR_LDO2:
 139         case PCF50633_REGULATOR_LDO3:
 140         case PCF50633_REGULATOR_LDO4:
 141         case PCF50633_REGULATOR_LDO5:
 142         case PCF50633_REGULATOR_LDO6:
 143         case PCF50633_REGULATOR_HCLDO:
 144                 volt_bits = ldo_voltage_bits(millivolts);
 145                 break;
 146         default:
 147                 return -EINVAL;
 148         }
 149
 150         return pcf50633_reg_write(pcf, regnr, volt_bits);
 151 }
 152
 153 static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
 154                                                 u8 bits)
 155 {
 156         int millivolts;
 157
 158         switch (id) {
 159         case PCF50633_REGULATOR_AUTO:
 160                 millivolts = auto_voltage_value(bits);
 161                 break;
 162         case PCF50633_REGULATOR_DOWN1:
 163                 millivolts = down_voltage_value(bits);
 164                 break;
 165         case PCF50633_REGULATOR_DOWN2:
 166                 millivolts = down_voltage_value(bits);
 167                 break;
 168         case PCF50633_REGULATOR_LDO1:
 169         case PCF50633_REGULATOR_LDO2:
 170         case PCF50633_REGULATOR_LDO3:
 171         case PCF50633_REGULATOR_LDO4:
 172         case PCF50633_REGULATOR_LDO5:
 173         case PCF50633_REGULATOR_LDO6:
 174         case PCF50633_REGULATOR_HCLDO:
 175                 millivolts = ldo_voltage_value(bits);
 176                 break;
 177         default:
 178                 return -EINVAL;
 179         }
 180
 181         return millivolts * 1000;
 182 }
 183
 184 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 185 {
 186         struct pcf50633 *pcf;
 187         int regulator_id;
 188         u8 volt_bits, regnr;
 189
 190         pcf = rdev_get_drvdata(rdev);
 191
 192         regulator_id = rdev_get_id(rdev);
 193         if (regulator_id >= PCF50633_NUM_REGULATORS)
 194                 return -EINVAL;
 195
 196         regnr = pcf50633_regulator_registers[regulator_id];
 197
 198         volt_bits = pcf50633_reg_read(pcf, regnr);
 199
 200         return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
 201 }
 202
 203 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 204                                                 unsigned int index)
 205 {
 206         struct pcf50633 *pcf;
 207         int regulator_id;
 208
 209         pcf = rdev_get_drvdata(rdev);
 210
 211         regulator_id = rdev_get_id(rdev);
 212
 213         switch (regulator_id) {
 214         case PCF50633_REGULATOR_AUTO:
 215                 index += 0x2f;
 216                 break;
 217         case PCF50633_REGULATOR_HCLDO:
 218                 index += 0x01;
 219                 break;
 220         default:
 221                 break;
 222         }
 223
 224         return pcf50633_regulator_voltage_value(regulator_id, index);
 225 }
 226
 227 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 228 {
 229         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 230         int regulator_id;
 231         u8 regnr;
 232
 233         regulator_id = rdev_get_id(rdev);
 234         if (regulator_id >= PCF50633_NUM_REGULATORS)
 235                 return -EINVAL;
 236
 237         /* The *ENA register is always one after the *OUT register */
 238         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 239
 240         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 241                                                        PCF50633_REGULATOR_ON);
 242 }
 243
 244 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 245 {
 246         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 247         int regulator_id;
 248         u8 regnr;
 249
 250         regulator_id = rdev_get_id(rdev);
 251         if (regulator_id >= PCF50633_NUM_REGULATORS)
 252                 return -EINVAL;
 253
 254         /* the *ENA register is always one after the *OUT register */
 255         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 256
 257         return pcf50633_reg_set_bit_mask(pcf, regnr,
 258                                         PCF50633_REGULATOR_ON, 0);
 259 }
 260
 261 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 262 {
 263         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 264         int regulator_id = rdev_get_id(rdev);
 265         u8 regnr;
 266
 267         regulator_id = rdev_get_id(rdev);
 268         if (regulator_id >= PCF50633_NUM_REGULATORS)
 269                 return -EINVAL;
 270
 271         /* the *ENA register is always one after the *OUT register */
 272         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 273
 274         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 275 }
 276
 277 static struct regulator_ops pcf50633_regulator_ops = {
 278         .set_voltage = pcf50633_regulator_set_voltage,
 279         .get_voltage = pcf50633_regulator_get_voltage,
 280         .list_voltage = pcf50633_regulator_list_voltage,
 281         .enable = pcf50633_regulator_enable,
 282         .disable = pcf50633_regulator_disable,
 283         .is_enabled = pcf50633_regulator_is_enabled,
 284 };
 285
 286 static struct regulator_desc regulators[] = {
 287         [PCF50633_REGULATOR_AUTO] =
 288                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 80),
 289         [PCF50633_REGULATOR_DOWN1] =
 290                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 95),
 291         [PCF50633_REGULATOR_DOWN2] =
 292                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 95),
 293         [PCF50633_REGULATOR_LDO1] =
 294                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 27),
 295         [PCF50633_REGULATOR_LDO2] =
 296                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 27),
 297         [PCF50633_REGULATOR_LDO3] =
 298                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 27),
 299         [PCF50633_REGULATOR_LDO4] =
 300                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 27),
 301         [PCF50633_REGULATOR_LDO5] =
 302                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 27),
 303         [PCF50633_REGULATOR_LDO6] =
 304                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 27),
 305         [PCF50633_REGULATOR_HCLDO] =
 306                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 26),
 307         [PCF50633_REGULATOR_MEMLDO] =
 308                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 0),
 309 };
 310
 311 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 312 {
 313         struct regulator_dev *rdev;
 314         struct pcf50633 *pcf;
 315
 316         /* Already set by core driver */
 317         pcf = dev_to_pcf50633(pdev->dev.parent);
 318
 319         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 320                                   pdev->dev.platform_data, pcf);
 321         if (IS_ERR(rdev))
 322                 return PTR_ERR(rdev);
 323
 324         platform_set_drvdata(pdev, rdev);
 325
 326         if (pcf->pdata->regulator_registered)
 327                 pcf->pdata->regulator_registered(pcf, pdev->id);
 328
 329         return 0;
 330 }
 331
 332 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 333 {
 334         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 335
 336         platform_set_drvdata(pdev, NULL);
 337         regulator_unregister(rdev);
 338
 339         return 0;
 340 }
 341
 342 static struct platform_driver pcf50633_regulator_driver = {
 343         .driver = {
 344                 .name = "pcf50633-regltr",
 345         },
 346         .probe = pcf50633_regulator_probe,
 347         .remove = __devexit_p(pcf50633_regulator_remove),
 348 };
 349
 350 static int __init pcf50633_regulator_init(void)
 351 {
 352         return platform_driver_register(&pcf50633_regulator_driver);
 353 }
 354 subsys_initcall(pcf50633_regulator_init);
 355
 356 static void __exit pcf50633_regulator_exit(void)
 357 {
 358         platform_driver_unregister(&pcf50633_regulator_driver);
 359 }
 360 module_exit(pcf50633_regulator_exit);
 361
 362 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 363 MODULE_DESCRIPTION("PCF50633 regulator driver");
 364 MODULE_LICENSE("GPL");
 365 MODULE_ALIAS("platform:pcf50633-regulator");