drivers/regulator/max8925-regulator.c

   1 /*
   2  * Regulators driver for Maxim max8925
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/mfd/max8925.h>
  19
  20 #define SD1_DVM_VMIN            850000
  21 #define SD1_DVM_VMAX            1000000
  22 #define SD1_DVM_STEP            50000
  23 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
  24 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
  25
  26 struct max8925_regulator_info {
  27         struct regulator_desc   desc;
  28         struct regulator_dev    *regulator;
  29         struct i2c_client       *i2c;
  30         struct max8925_chip     *chip;
  31
  32         int     min_uV;
  33         int     max_uV;
  34         int     step_uV;
  35         int     vol_reg;
  36         int     vol_shift;
  37         int     vol_nbits;
  38         int     enable_bit;
  39         int     enable_reg;
  40 };
  41
  42 static inline int check_range(struct max8925_regulator_info *info,
  43                               int min_uV, int max_uV)
  44 {
  45         if (min_uV < info->min_uV || min_uV > info->max_uV)
  46                 return -EINVAL;
  47
  48         return 0;
  49 }
  50
  51 static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
  52 {
  53         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  54         return info->min_uV + index * info->step_uV;
  55 }
  56
  57 static int max8925_set_voltage(struct regulator_dev *rdev,
  58                                int min_uV, int max_uV)
  59 {
  60         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  61         unsigned char data, mask;
  62
  63         if (check_range(info, min_uV, max_uV)) {
  64                 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
  65                         min_uV, max_uV);
  66                 return -EINVAL;
  67         }
  68         data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
  69         data <<= info->vol_shift;
  70         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  71
  72         return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
  73 }
  74
  75 static int max8925_get_voltage(struct regulator_dev *rdev)
  76 {
  77         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  78         unsigned char data, mask;
  79         int ret;
  80
  81         ret = max8925_reg_read(info->i2c, info->vol_reg);
  82         if (ret < 0)
  83                 return ret;
  84         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  85         data = (ret & mask) >> info->vol_shift;
  86
  87         return max8925_list_voltage(rdev, data);
  88 }
  89
  90 static int max8925_enable(struct regulator_dev *rdev)
  91 {
  92         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  93
  94         return max8925_set_bits(info->i2c, info->enable_reg,
  95                                 1 << info->enable_bit,
  96                                 1 << info->enable_bit);
  97 }
  98
  99 static int max8925_disable(struct regulator_dev *rdev)
 100 {
 101         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 102
 103         return max8925_set_bits(info->i2c, info->enable_reg,
 104                                 1 << info->enable_bit, 0);
 105 }
 106
 107 static int max8925_is_enabled(struct regulator_dev *rdev)
 108 {
 109         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 110         int ret;
 111
 112         ret = max8925_reg_read(info->i2c, info->vol_reg);
 113         if (ret < 0)
 114                 return ret;
 115
 116         return ret & (1 << info->enable_bit);
 117 }
 118
 119 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 120 {
 121         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 122         unsigned char data, mask;
 123
 124         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 125                 return -EINVAL;
 126
 127         data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
 128         data <<= SD1_DVM_SHIFT;
 129         mask = 3 << SD1_DVM_SHIFT;
 130
 131         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 132 }
 133
 134 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 135 {
 136         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 137
 138         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 139                                 1 << SD1_DVM_EN);
 140 }
 141
 142 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 143 {
 144         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 145
 146         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 147 }
 148
 149 static struct regulator_ops max8925_regulator_sdv_ops = {
 150         .set_voltage            = max8925_set_voltage,
 151         .get_voltage            = max8925_get_voltage,
 152         .enable                 = max8925_enable,
 153         .disable                = max8925_disable,
 154         .is_enabled             = max8925_is_enabled,
 155         .set_suspend_voltage    = max8925_set_dvm_voltage,
 156         .set_suspend_enable     = max8925_set_dvm_enable,
 157         .set_suspend_disable    = max8925_set_dvm_disable,
 158 };
 159
 160 static struct regulator_ops max8925_regulator_ldo_ops = {
 161         .set_voltage            = max8925_set_voltage,
 162         .get_voltage            = max8925_get_voltage,
 163         .enable                 = max8925_enable,
 164         .disable                = max8925_disable,
 165         .is_enabled             = max8925_is_enabled,
 166 };
 167
 168 #define MAX8925_SDV(_id, min, max, step)                        \
 169 {                                                               \
 170         .desc   = {                                             \
 171                 .name   = "SDV" #_id,                           \
 172                 .ops    = &max8925_regulator_sdv_ops,           \
 173                 .type   = REGULATOR_VOLTAGE,                    \
 174                 .id     = MAX8925_ID_SD##_id,                   \
 175                 .owner  = THIS_MODULE,                          \
 176         },                                                      \
 177         .min_uV         = min * 1000,                           \
 178         .max_uV         = max * 1000,                           \
 179         .step_uV        = step * 1000,                          \
 180         .vol_reg        = MAX8925_SDV##_id,                     \
 181         .vol_shift      = 0,                                    \
 182         .vol_nbits      = 6,                                    \
 183         .enable_reg     = MAX8925_SDCTL##_id,                   \
 184         .enable_bit     = 0,                                    \
 185 }
 186
 187 #define MAX8925_LDO(_id, min, max, step)                        \
 188 {                                                               \
 189         .desc   = {                                             \
 190                 .name   = "LDO" #_id,                           \
 191                 .ops    = &max8925_regulator_ldo_ops,           \
 192                 .type   = REGULATOR_VOLTAGE,                    \
 193                 .id     = MAX8925_ID_LDO##_id,                  \
 194                 .owner  = THIS_MODULE,                          \
 195         },                                                      \
 196         .min_uV         = min * 1000,                           \
 197         .max_uV         = max * 1000,                           \
 198         .step_uV        = step * 1000,                          \
 199         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 200         .vol_shift      = 0,                                    \
 201         .vol_nbits      = 6,                                    \
 202         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 203         .enable_bit     = 0,                                    \
 204 }
 205
 206 static struct max8925_regulator_info max8925_regulator_info[] = {
 207         MAX8925_SDV(1, 637.5, 1425, 12.5),
 208         MAX8925_SDV(2,   650, 2225,   25),
 209         MAX8925_SDV(3,   750, 3900,   50),
 210
 211         MAX8925_LDO(1,  750, 3900, 50),
 212         MAX8925_LDO(2,  650, 2250, 25),
 213         MAX8925_LDO(3,  650, 2250, 25),
 214         MAX8925_LDO(4,  750, 3900, 50),
 215         MAX8925_LDO(5,  750, 3900, 50),
 216         MAX8925_LDO(6,  750, 3900, 50),
 217         MAX8925_LDO(7,  750, 3900, 50),
 218         MAX8925_LDO(8,  750, 3900, 50),
 219         MAX8925_LDO(9,  750, 3900, 50),
 220         MAX8925_LDO(10, 750, 3900, 50),
 221         MAX8925_LDO(11, 750, 3900, 50),
 222         MAX8925_LDO(12, 750, 3900, 50),
 223         MAX8925_LDO(13, 750, 3900, 50),
 224         MAX8925_LDO(14, 750, 3900, 50),
 225         MAX8925_LDO(15, 750, 3900, 50),
 226         MAX8925_LDO(16, 750, 3900, 50),
 227         MAX8925_LDO(17, 650, 2250, 25),
 228         MAX8925_LDO(18, 650, 2250, 25),
 229         MAX8925_LDO(19, 750, 3900, 50),
 230         MAX8925_LDO(20, 750, 3900, 50),
 231 };
 232
 233 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
 234 {
 235         struct max8925_regulator_info *ri;
 236         int i;
 237
 238         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 239                 ri = &max8925_regulator_info[i];
 240                 if (ri->desc.id == id)
 241                         return ri;
 242         }
 243         return NULL;
 244 }
 245
 246 static int __devinit max8925_regulator_probe(struct platform_device *pdev)
 247 {
 248         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 249         struct max8925_platform_data *pdata = chip->dev->platform_data;
 250         struct max8925_regulator_info *ri;
 251         struct regulator_dev *rdev;
 252
 253         ri = find_regulator_info(pdev->id);
 254         if (ri == NULL) {
 255                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 256                 return -EINVAL;
 257         }
 258         ri->i2c = chip->i2c;
 259         ri->chip = chip;
 260
 261         rdev = regulator_register(&ri->desc, &pdev->dev,
 262                                   pdata->regulator[pdev->id], ri);
 263         if (IS_ERR(rdev)) {
 264                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 265                                 ri->desc.name);
 266                 return PTR_ERR(rdev);
 267         }
 268
 269         platform_set_drvdata(pdev, rdev);
 270         return 0;
 271 }
 272
 273 static int __devexit max8925_regulator_remove(struct platform_device *pdev)
 274 {
 275         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 276
 277         platform_set_drvdata(pdev, NULL);
 278         regulator_unregister(rdev);
 279
 280         return 0;
 281 }
 282
 283 static struct platform_driver max8925_regulator_driver = {
 284         .driver         = {
 285                 .name   = "max8925-regulator",
 286                 .owner  = THIS_MODULE,
 287         },
 288         .probe          = max8925_regulator_probe,
 289         .remove         = __devexit_p(max8925_regulator_remove),
 290 };
 291
 292 static int __init max8925_regulator_init(void)
 293 {
 294         return platform_driver_register(&max8925_regulator_driver);
 295 }
 296 subsys_initcall(max8925_regulator_init);
 297
 298 static void __exit max8925_regulator_exit(void)
 299 {
 300         platform_driver_unregister(&max8925_regulator_driver);
 301 }
 302 module_exit(max8925_regulator_exit);
 303
 304 MODULE_LICENSE("GPL");
 305 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 306 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 307 MODULE_ALIAS("platform:max8925-regulator");
 308