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 0x2f;
  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         /* AUTOOUT: 00000000 to 00101110 are reserved.
  91          * Return 0 for bits in reserved range, which means this selector code
  92          * can't be used on this system */
  93         if (bits < 0x2f)
  94                 return 0;
  95
  96         return 625 + (bits * 25);
  97 }
  98
  99
 100 static unsigned int down_voltage_value(u8 bits)
 101 {
 102         return 625 + (bits * 25);
 103 }
 104
 105
 106 static unsigned int ldo_voltage_value(u8 bits)
 107 {
 108         bits &= 0x1f;
 109
 110         return 900 + (bits * 100);
 111 }
 112
 113 static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 114                                           int min_uV, int max_uV,
 115                                           unsigned *selector)
 116 {
 117         struct pcf50633 *pcf;
 118         int regulator_id, millivolts;
 119         u8 volt_bits, regnr;
 120
 121         pcf = rdev_get_drvdata(rdev);
 122
 123         regulator_id = rdev_get_id(rdev);
 124         if (regulator_id >= PCF50633_NUM_REGULATORS)
 125                 return -EINVAL;
 126
 127         millivolts = min_uV / 1000;
 128
 129         regnr = pcf50633_regulator_registers[regulator_id];
 130
 131         switch (regulator_id) {
 132         case PCF50633_REGULATOR_AUTO:
 133                 volt_bits = auto_voltage_bits(millivolts);
 134                 break;
 135         case PCF50633_REGULATOR_DOWN1:
 136                 volt_bits = down_voltage_bits(millivolts);
 137                 break;
 138         case PCF50633_REGULATOR_DOWN2:
 139                 volt_bits = down_voltage_bits(millivolts);
 140                 break;
 141         case PCF50633_REGULATOR_LDO1:
 142         case PCF50633_REGULATOR_LDO2:
 143         case PCF50633_REGULATOR_LDO3:
 144         case PCF50633_REGULATOR_LDO4:
 145         case PCF50633_REGULATOR_LDO5:
 146         case PCF50633_REGULATOR_LDO6:
 147         case PCF50633_REGULATOR_HCLDO:
 148         case PCF50633_REGULATOR_MEMLDO:
 149                 volt_bits = ldo_voltage_bits(millivolts);
 150                 break;
 151         default:
 152                 return -EINVAL;
 153         }
 154
 155         *selector = volt_bits;
 156
 157         return pcf50633_reg_write(pcf, regnr, volt_bits);
 158 }
 159
 160 static int pcf50633_regulator_get_voltage_sel(struct regulator_dev *rdev)
 161 {
 162         struct pcf50633 *pcf;
 163         int regulator_id;
 164         u8 regnr;
 165
 166         pcf = rdev_get_drvdata(rdev);
 167
 168         regulator_id = rdev_get_id(rdev);
 169         if (regulator_id >= PCF50633_NUM_REGULATORS)
 170                 return -EINVAL;
 171
 172         regnr = pcf50633_regulator_registers[regulator_id];
 173
 174         return pcf50633_reg_read(pcf, regnr);
 175 }
 176
 177 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 178                                                 unsigned int index)
 179 {
 180         int regulator_id = rdev_get_id(rdev);
 181
 182         int millivolts;
 183
 184         switch (regulator_id) {
 185         case PCF50633_REGULATOR_AUTO:
 186                 millivolts = auto_voltage_value(index);
 187                 break;
 188         case PCF50633_REGULATOR_DOWN1:
 189                 millivolts = down_voltage_value(index);
 190                 break;
 191         case PCF50633_REGULATOR_DOWN2:
 192                 millivolts = down_voltage_value(index);
 193                 break;
 194         case PCF50633_REGULATOR_LDO1:
 195         case PCF50633_REGULATOR_LDO2:
 196         case PCF50633_REGULATOR_LDO3:
 197         case PCF50633_REGULATOR_LDO4:
 198         case PCF50633_REGULATOR_LDO5:
 199         case PCF50633_REGULATOR_LDO6:
 200         case PCF50633_REGULATOR_HCLDO:
 201         case PCF50633_REGULATOR_MEMLDO:
 202                 millivolts = ldo_voltage_value(index);
 203                 break;
 204         default:
 205                 return -EINVAL;
 206         }
 207
 208         return millivolts * 1000;
 209 }
 210
 211 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 212 {
 213         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 214         int regulator_id;
 215         u8 regnr;
 216
 217         regulator_id = rdev_get_id(rdev);
 218         if (regulator_id >= PCF50633_NUM_REGULATORS)
 219                 return -EINVAL;
 220
 221         /* The *ENA register is always one after the *OUT register */
 222         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 223
 224         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 225                                                        PCF50633_REGULATOR_ON);
 226 }
 227
 228 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 229 {
 230         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 231         int regulator_id;
 232         u8 regnr;
 233
 234         regulator_id = rdev_get_id(rdev);
 235         if (regulator_id >= PCF50633_NUM_REGULATORS)
 236                 return -EINVAL;
 237
 238         /* the *ENA register is always one after the *OUT register */
 239         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 240
 241         return pcf50633_reg_set_bit_mask(pcf, regnr,
 242                                         PCF50633_REGULATOR_ON, 0);
 243 }
 244
 245 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 246 {
 247         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 248         int regulator_id = rdev_get_id(rdev);
 249         u8 regnr;
 250
 251         regulator_id = rdev_get_id(rdev);
 252         if (regulator_id >= PCF50633_NUM_REGULATORS)
 253                 return -EINVAL;
 254
 255         /* the *ENA register is always one after the *OUT register */
 256         regnr = pcf50633_regulator_registers[regulator_id] + 1;
 257
 258         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 259 }
 260
 261 static struct regulator_ops pcf50633_regulator_ops = {
 262         .set_voltage = pcf50633_regulator_set_voltage,
 263         .get_voltage_sel = pcf50633_regulator_get_voltage_sel,
 264         .list_voltage = pcf50633_regulator_list_voltage,
 265         .enable = pcf50633_regulator_enable,
 266         .disable = pcf50633_regulator_disable,
 267         .is_enabled = pcf50633_regulator_is_enabled,
 268 };
 269
 270 static const struct regulator_desc regulators[] = {
 271         [PCF50633_REGULATOR_AUTO] =
 272                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 128),
 273         [PCF50633_REGULATOR_DOWN1] =
 274                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 96),
 275         [PCF50633_REGULATOR_DOWN2] =
 276                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 96),
 277         [PCF50633_REGULATOR_LDO1] =
 278                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 28),
 279         [PCF50633_REGULATOR_LDO2] =
 280                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 28),
 281         [PCF50633_REGULATOR_LDO3] =
 282                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 28),
 283         [PCF50633_REGULATOR_LDO4] =
 284                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 28),
 285         [PCF50633_REGULATOR_LDO5] =
 286                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 28),
 287         [PCF50633_REGULATOR_LDO6] =
 288                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 28),
 289         [PCF50633_REGULATOR_HCLDO] =
 290                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 28),
 291         [PCF50633_REGULATOR_MEMLDO] =
 292                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 28),
 293 };
 294
 295 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 296 {
 297         struct regulator_dev *rdev;
 298         struct pcf50633 *pcf;
 299         struct regulator_config config = { };
 300
 301         /* Already set by core driver */
 302         pcf = dev_to_pcf50633(pdev->dev.parent);
 303
 304         config.dev = &pdev->dev;
 305         config.init_data = pdev->dev.platform_data;
 306         config.driver_data = pcf;
 307
 308         rdev = regulator_register(&regulators[pdev->id], &config);
 309         if (IS_ERR(rdev))
 310                 return PTR_ERR(rdev);
 311
 312         platform_set_drvdata(pdev, rdev);
 313
 314         if (pcf->pdata->regulator_registered)
 315                 pcf->pdata->regulator_registered(pcf, pdev->id);
 316
 317         return 0;
 318 }
 319
 320 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 321 {
 322         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 323
 324         platform_set_drvdata(pdev, NULL);
 325         regulator_unregister(rdev);
 326
 327         return 0;
 328 }
 329
 330 static struct platform_driver pcf50633_regulator_driver = {
 331         .driver = {
 332                 .name = "pcf50633-regltr",
 333         },
 334         .probe = pcf50633_regulator_probe,
 335         .remove = __devexit_p(pcf50633_regulator_remove),
 336 };
 337
 338 static int __init pcf50633_regulator_init(void)
 339 {
 340         return platform_driver_register(&pcf50633_regulator_driver);
 341 }
 342 subsys_initcall(pcf50633_regulator_init);
 343
 344 static void __exit pcf50633_regulator_exit(void)
 345 {
 346         platform_driver_unregister(&pcf50633_regulator_driver);
 347 }
 348 module_exit(pcf50633_regulator_exit);
 349
 350 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 351 MODULE_DESCRIPTION("PCF50633 regulator driver");
 352 MODULE_LICENSE("GPL");
 353 MODULE_ALIAS("platform:pcf50633-regulator");