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)          \
  28         {                                       \
  29                 .name = _name,                  \
  30                 .id = _id,                      \
  31                 .ops = &pcf50633_regulator_ops, \
  32                 .type = REGULATOR_VOLTAGE,      \
  33                 .owner = THIS_MODULE,           \
  34         }
  35
  36 static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
  37         [PCF50633_REGULATOR_AUTO]       = PCF50633_REG_AUTOOUT,
  38         [PCF50633_REGULATOR_DOWN1]      = PCF50633_REG_DOWN1OUT,
  39         [PCF50633_REGULATOR_DOWN2]      = PCF50633_REG_DOWN2OUT,
  40         [PCF50633_REGULATOR_MEMLDO]     = PCF50633_REG_MEMLDOOUT,
  41         [PCF50633_REGULATOR_LDO1]       = PCF50633_REG_LDO1OUT,
  42         [PCF50633_REGULATOR_LDO2]       = PCF50633_REG_LDO2OUT,
  43         [PCF50633_REGULATOR_LDO3]       = PCF50633_REG_LDO3OUT,
  44         [PCF50633_REGULATOR_LDO4]       = PCF50633_REG_LDO4OUT,
  45         [PCF50633_REGULATOR_LDO5]       = PCF50633_REG_LDO5OUT,
  46         [PCF50633_REGULATOR_LDO6]       = PCF50633_REG_LDO6OUT,
  47         [PCF50633_REGULATOR_HCLDO]      = PCF50633_REG_HCLDOOUT,
  48 };
  49
  50 /* Bits from voltage value */
  51 static u8 auto_voltage_bits(unsigned int millivolts)
  52 {
  53         if (millivolts < 1800)
  54                 return 0;
  55         if (millivolts > 3800)
  56                 return 0xff;
  57
  58         millivolts -= 625;
  59
  60         return millivolts / 25;
  61 }
  62
  63 static u8 down_voltage_bits(unsigned int millivolts)
  64 {
  65         if (millivolts < 625)
  66                 return 0;
  67         else if (millivolts > 3000)
  68                 return 0xff;
  69
  70         millivolts -= 625;
  71
  72         return millivolts / 25;
  73 }
  74
  75 static u8 ldo_voltage_bits(unsigned int millivolts)
  76 {
  77         if (millivolts < 900)
  78                 return 0;
  79         else if (millivolts > 3600)
  80                 return 0x1f;
  81
  82         millivolts -= 900;
  83         return millivolts / 100;
  84 }
  85
  86 /* Obtain voltage value from bits */
  87 static unsigned int auto_voltage_value(u8 bits)
  88 {
  89         if (bits < 0x2f)
  90                 return 0;
  91
  92         return 625 + (bits * 25);
  93 }
  94
  95
  96 static unsigned int down_voltage_value(u8 bits)
  97 {
  98         return 625 + (bits * 25);
  99 }
 100
 101
 102 static unsigned int ldo_voltage_value(u8 bits)
 103 {
 104         bits &= 0x1f;
 105
 106         return 900 + (bits * 100);
 107 }
 108
 109 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 110                                                 int min_uV, int max_uV)
 111 {
 112         struct pcf50633 *pcf;
 113         int regulator_id, millivolts;
 114         u8 volt_bits, regnr;
 115
 116         pcf = rdev_get_drvdata(rdev);
 117
 118         regulator_id = rdev_get_id(rdev);
 119         if (regulator_id >= PCF50633_NUM_REGULATORS)
 120                 return -EINVAL;
 121
 122         millivolts = min_uV / 1000;
 123
 124         regnr = pcf50633_regulator_registers[regulator_id];
 125
 126         switch (regulator_id) {
 127         case PCF50633_REGULATOR_AUTO:
 128                 volt_bits = auto_voltage_bits(millivolts);
 129                 break;
 130         case PCF50633_REGULATOR_DOWN1:
 131                 volt_bits = down_voltage_bits(millivolts);
 132                 break;
 133         case PCF50633_REGULATOR_DOWN2:
 134                 volt_bits = down_voltage_bits(millivolts);
 135                 break;
 136         case PCF50633_REGULATOR_LDO1:
 137         case PCF50633_REGULATOR_LDO2:
 138         case PCF50633_REGULATOR_LDO3:
 139         case PCF50633_REGULATOR_LDO4:
 140         case PCF50633_REGULATOR_LDO5:
 141         case PCF50633_REGULATOR_LDO6:
 142         case PCF50633_REGULATOR_HCLDO:
 143                 volt_bits = ldo_voltage_bits(millivolts);
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         return pcf50633_reg_write(pcf, regnr, volt_bits);
 150 }
 151
 152 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 153 {
 154         struct pcf50633 *pcf;
 155         int regulator_id, millivolts, volt_bits;
 156         u8 regnr;
 157
 158         pcf = rdev_get_drvdata(rdev);;
 159
 160         regulator_id = rdev_get_id(rdev);
 161         if (regulator_id >= PCF50633_NUM_REGULATORS)
 162                 return -EINVAL;
 163
 164         regnr = pcf50633_regulator_registers[regulator_id];
 165
 166         volt_bits = pcf50633_reg_read(pcf, regnr);
 167         if (volt_bits < 0)
 168                 return -1;
 169
 170         switch (regulator_id) {
 171         case PCF50633_REGULATOR_AUTO:
 172                 millivolts = auto_voltage_value(volt_bits);
 173                 break;
 174         case PCF50633_REGULATOR_DOWN1:
 175                 millivolts = down_voltage_value(volt_bits);
 176                 break;
 177         case PCF50633_REGULATOR_DOWN2:
 178                 millivolts = down_voltage_value(volt_bits);
 179                 break;
 180         case PCF50633_REGULATOR_LDO1:
 181         case PCF50633_REGULATOR_LDO2:
 182         case PCF50633_REGULATOR_LDO3:
 183         case PCF50633_REGULATOR_LDO4:
 184         case PCF50633_REGULATOR_LDO5:
 185         case PCF50633_REGULATOR_LDO6:
 186         case PCF50633_REGULATOR_HCLDO:
 187                 millivolts = ldo_voltage_value(volt_bits);
 188                 break;
 189         default:
 190                 return -EINVAL;
 191         }
 192
 193         return millivolts * 1000;
 194 }
 195
 196 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 197 {
 198         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 199         int regulator_id;
 200         u8 regnr;
 201
 202         regulator_id = rdev_get_id(rdev);
 203         if (regulator_id >= PCF50633_NUM_REGULATORS)
 204                 return -EINVAL;
 205
 206         /* The *ENA register is always one after the *OUT register */
 207         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 208
 209         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 210                                                        PCF50633_REGULATOR_ON);
 211 }
 212
 213 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 214 {
 215         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 216         int regulator_id;
 217         u8 regnr;
 218
 219         regulator_id = rdev_get_id(rdev);
 220         if (regulator_id >= PCF50633_NUM_REGULATORS)
 221                 return -EINVAL;
 222
 223         /* the *ENA register is always one after the *OUT register */
 224         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 225
 226         return pcf50633_reg_set_bit_mask(pcf, regnr,
 227                                         PCF50633_REGULATOR_ON, 0);
 228 }
 229
 230 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 231 {
 232         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 233         int regulator_id = rdev_get_id(rdev);
 234         u8 regnr;
 235
 236         regulator_id = rdev_get_id(rdev);
 237         if (regulator_id >= PCF50633_NUM_REGULATORS)
 238                 return -EINVAL;
 239
 240         /* the *ENA register is always one after the *OUT register */
 241         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 242
 243         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 244 }
 245
 246 static struct regulator_ops pcf50633_regulator_ops = {
 247         .set_voltage = pcf50633_regulator_set_voltage,
 248         .get_voltage = pcf50633_regulator_get_voltage,
 249         .enable = pcf50633_regulator_enable,
 250         .disable = pcf50633_regulator_disable,
 251         .is_enabled = pcf50633_regulator_is_enabled,
 252 };
 253
 254 static struct regulator_desc regulators[] = {
 255         [PCF50633_REGULATOR_AUTO] =
 256                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
 257         [PCF50633_REGULATOR_DOWN1] =
 258                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
 259         [PCF50633_REGULATOR_DOWN2] =
 260                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
 261         [PCF50633_REGULATOR_LDO1] =
 262                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
 263         [PCF50633_REGULATOR_LDO2] =
 264                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
 265         [PCF50633_REGULATOR_LDO3] =
 266                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
 267         [PCF50633_REGULATOR_LDO4] =
 268                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
 269         [PCF50633_REGULATOR_LDO5] =
 270                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
 271         [PCF50633_REGULATOR_LDO6] =
 272                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
 273         [PCF50633_REGULATOR_HCLDO] =
 274                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
 275         [PCF50633_REGULATOR_MEMLDO] =
 276                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
 277 };
 278
 279 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 280 {
 281         struct regulator_dev *rdev;
 282         struct pcf50633 *pcf;
 283
 284         /* Already set by core driver */
 285         pcf = platform_get_drvdata(pdev);
 286
 287         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 288                                   pdev->dev.platform_data, pcf);
 289         if (IS_ERR(rdev))
 290                 return PTR_ERR(rdev);
 291
 292         if (pcf->pdata->regulator_registered)
 293                 pcf->pdata->regulator_registered(pcf, pdev->id);
 294
 295         return 0;
 296 }
 297
 298 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 299 {
 300         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 301
 302         regulator_unregister(rdev);
 303
 304         return 0;
 305 }
 306
 307 static struct platform_driver pcf50633_regulator_driver = {
 308         .driver = {
 309                 .name = "pcf50633-regltr",
 310         },
 311         .probe = pcf50633_regulator_probe,
 312         .remove = __devexit_p(pcf50633_regulator_remove),
 313 };
 314
 315 static int __init pcf50633_regulator_init(void)
 316 {
 317         return platform_driver_register(&pcf50633_regulator_driver);
 318 }
 319 subsys_initcall(pcf50633_regulator_init);
 320
 321 static void __exit pcf50633_regulator_exit(void)
 322 {
 323         platform_driver_unregister(&pcf50633_regulator_driver);
 324 }
 325 module_exit(pcf50633_regulator_exit);
 326
 327 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 328 MODULE_DESCRIPTION("PCF50633 regulator driver");
 329 MODULE_LICENSE("GPL");
 330 MODULE_ALIAS("platform:pcf50633-regulator");