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 = PCF50633_REGULATOR_##_id,                 \
  31                 .ops = &pcf50633_regulator_ops,                 \
  32                 .n_voltages = _n,                               \
  33                 .type = REGULATOR_VOLTAGE,                      \
  34                 .owner = THIS_MODULE,                           \
  35                 .vsel_reg = PCF50633_REG_##_id##OUT,            \
  36                 .vsel_mask = 0xff,                              \
  37                 .enable_reg = PCF50633_REG_##_id##OUT + 1,      \
  38                 .enable_mask = PCF50633_REGULATOR_ON,           \
  39         }
  40
  41 /* Bits from voltage value */
  42 static u8 auto_voltage_bits(unsigned int millivolts)
  43 {
  44         if (millivolts < 1800)
  45                 return 0x2f;
  46         if (millivolts > 3800)
  47                 return 0xff;
  48
  49         millivolts -= 625;
  50
  51         return millivolts / 25;
  52 }
  53
  54 static u8 down_voltage_bits(unsigned int millivolts)
  55 {
  56         if (millivolts < 625)
  57                 return 0;
  58         else if (millivolts > 3000)
  59                 return 0xff;
  60
  61         millivolts -= 625;
  62
  63         return millivolts / 25;
  64 }
  65
  66 static u8 ldo_voltage_bits(unsigned int millivolts)
  67 {
  68         if (millivolts < 900)
  69                 return 0;
  70         else if (millivolts > 3600)
  71                 return 0x1f;
  72
  73         millivolts -= 900;
  74         return millivolts / 100;
  75 }
  76
  77 /* Obtain voltage value from bits */
  78 static unsigned int auto_voltage_value(u8 bits)
  79 {
  80         /* AUTOOUT: 00000000 to 00101110 are reserved.
  81          * Return 0 for bits in reserved range, which means this selector code
  82          * can't be used on this system */
  83         if (bits < 0x2f)
  84                 return 0;
  85
  86         return 625 + (bits * 25);
  87 }
  88
  89
  90 static unsigned int down_voltage_value(u8 bits)
  91 {
  92         return 625 + (bits * 25);
  93 }
  94
  95
  96 static unsigned int ldo_voltage_value(u8 bits)
  97 {
  98         bits &= 0x1f;
  99
 100         return 900 + (bits * 100);
 101 }
 102
 103 static int pcf50633_regulator_map_voltage(struct regulator_dev *rdev,
 104                                           int min_uV, int max_uV)
 105 {
 106         struct pcf50633 *pcf;
 107         int regulator_id, millivolts;
 108         u8 volt_bits;
 109
 110         pcf = rdev_get_drvdata(rdev);
 111
 112         regulator_id = rdev_get_id(rdev);
 113         if (regulator_id >= PCF50633_NUM_REGULATORS)
 114                 return -EINVAL;
 115
 116         millivolts = min_uV / 1000;
 117
 118         switch (regulator_id) {
 119         case PCF50633_REGULATOR_AUTO:
 120                 volt_bits = auto_voltage_bits(millivolts);
 121                 break;
 122         case PCF50633_REGULATOR_DOWN1:
 123         case PCF50633_REGULATOR_DOWN2:
 124                 volt_bits = down_voltage_bits(millivolts);
 125                 break;
 126         case PCF50633_REGULATOR_LDO1:
 127         case PCF50633_REGULATOR_LDO2:
 128         case PCF50633_REGULATOR_LDO3:
 129         case PCF50633_REGULATOR_LDO4:
 130         case PCF50633_REGULATOR_LDO5:
 131         case PCF50633_REGULATOR_LDO6:
 132         case PCF50633_REGULATOR_HCLDO:
 133         case PCF50633_REGULATOR_MEMLDO:
 134                 volt_bits = ldo_voltage_bits(millivolts);
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         return volt_bits;
 141 }
 142
 143 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 144                                                 unsigned int index)
 145 {
 146         int regulator_id = rdev_get_id(rdev);
 147
 148         int millivolts;
 149
 150         switch (regulator_id) {
 151         case PCF50633_REGULATOR_AUTO:
 152                 millivolts = auto_voltage_value(index);
 153                 break;
 154         case PCF50633_REGULATOR_DOWN1:
 155         case PCF50633_REGULATOR_DOWN2:
 156                 millivolts = down_voltage_value(index);
 157                 break;
 158         case PCF50633_REGULATOR_LDO1:
 159         case PCF50633_REGULATOR_LDO2:
 160         case PCF50633_REGULATOR_LDO3:
 161         case PCF50633_REGULATOR_LDO4:
 162         case PCF50633_REGULATOR_LDO5:
 163         case PCF50633_REGULATOR_LDO6:
 164         case PCF50633_REGULATOR_HCLDO:
 165         case PCF50633_REGULATOR_MEMLDO:
 166                 millivolts = ldo_voltage_value(index);
 167                 break;
 168         default:
 169                 return -EINVAL;
 170         }
 171
 172         return millivolts * 1000;
 173 }
 174
 175 static struct regulator_ops pcf50633_regulator_ops = {
 176         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 177         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 178         .list_voltage = pcf50633_regulator_list_voltage,
 179         .map_voltage = pcf50633_regulator_map_voltage,
 180         .enable = regulator_enable_regmap,
 181         .disable = regulator_disable_regmap,
 182         .is_enabled = regulator_is_enabled_regmap,
 183 };
 184
 185 static const struct regulator_desc regulators[] = {
 186         [PCF50633_REGULATOR_AUTO] = PCF50633_REGULATOR("auto", AUTO, 128),
 187         [PCF50633_REGULATOR_DOWN1] = PCF50633_REGULATOR("down1", DOWN1, 96),
 188         [PCF50633_REGULATOR_DOWN2] = PCF50633_REGULATOR("down2", DOWN2, 96),
 189         [PCF50633_REGULATOR_LDO1] = PCF50633_REGULATOR("ldo1", LDO1, 28),
 190         [PCF50633_REGULATOR_LDO2] = PCF50633_REGULATOR("ldo2", LDO2, 28),
 191         [PCF50633_REGULATOR_LDO3] = PCF50633_REGULATOR("ldo3", LDO3, 28),
 192         [PCF50633_REGULATOR_LDO4] = PCF50633_REGULATOR("ldo4", LDO4, 28),
 193         [PCF50633_REGULATOR_LDO5] = PCF50633_REGULATOR("ldo5", LDO5, 28),
 194         [PCF50633_REGULATOR_LDO6] = PCF50633_REGULATOR("ldo6", LDO6, 28),
 195         [PCF50633_REGULATOR_HCLDO] = PCF50633_REGULATOR("hcldo", HCLDO, 28),
 196         [PCF50633_REGULATOR_MEMLDO] = PCF50633_REGULATOR("memldo", MEMLDO, 28),
 197 };
 198
 199 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 200 {
 201         struct regulator_dev *rdev;
 202         struct pcf50633 *pcf;
 203         struct regulator_config config = { };
 204
 205         /* Already set by core driver */
 206         pcf = dev_to_pcf50633(pdev->dev.parent);
 207
 208         config.dev = &pdev->dev;
 209         config.init_data = pdev->dev.platform_data;
 210         config.driver_data = pcf;
 211         config.regmap = pcf->regmap;
 212
 213         rdev = regulator_register(&regulators[pdev->id], &config);
 214         if (IS_ERR(rdev))
 215                 return PTR_ERR(rdev);
 216
 217         platform_set_drvdata(pdev, rdev);
 218
 219         if (pcf->pdata->regulator_registered)
 220                 pcf->pdata->regulator_registered(pcf, pdev->id);
 221
 222         return 0;
 223 }
 224
 225 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 226 {
 227         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 228
 229         platform_set_drvdata(pdev, NULL);
 230         regulator_unregister(rdev);
 231
 232         return 0;
 233 }
 234
 235 static struct platform_driver pcf50633_regulator_driver = {
 236         .driver = {
 237                 .name = "pcf50633-regltr",
 238         },
 239         .probe = pcf50633_regulator_probe,
 240         .remove = pcf50633_regulator_remove,
 241 };
 242
 243 static int __init pcf50633_regulator_init(void)
 244 {
 245         return platform_driver_register(&pcf50633_regulator_driver);
 246 }
 247 subsys_initcall(pcf50633_regulator_init);
 248
 249 static void __exit pcf50633_regulator_exit(void)
 250 {
 251         platform_driver_unregister(&pcf50633_regulator_driver);
 252 }
 253 module_exit(pcf50633_regulator_exit);
 254
 255 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 256 MODULE_DESCRIPTION("PCF50633 regulator driver");
 257 MODULE_LICENSE("GPL");
 258 MODULE_ALIAS("platform:pcf50633-regulator");