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 /* bit definitions in SD & LDO control registers */
  27 #define OUT_ENABLE              0x1f            /* Power U/D sequence as I2C */
  28 #define OUT_DISABLE             0x1e            /* Power U/D sequence as I2C */
  29
  30 struct max8925_regulator_info {
  31         struct regulator_desc   desc;
  32         struct regulator_dev    *regulator;
  33         struct i2c_client       *i2c;
  34         struct max8925_chip     *chip;
  35
  36         int     min_uV;
  37         int     max_uV;
  38         int     step_uV;
  39         int     vol_reg;
  40         int     vol_shift;
  41         int     vol_nbits;
  42         int     enable_bit;
  43         int     enable_reg;
  44 };
  45
  46 static inline int check_range(struct max8925_regulator_info *info,
  47                               int min_uV, int max_uV)
  48 {
  49         if (min_uV < info->min_uV || min_uV > info->max_uV)
  50                 return -EINVAL;
  51
  52         return 0;
  53 }
  54
  55 static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index)
  56 {
  57         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  58         return info->min_uV + index * info->step_uV;
  59 }
  60
  61 static int max8925_set_voltage(struct regulator_dev *rdev,
  62                                int min_uV, int max_uV, unsigned int *selector)
  63 {
  64         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  65         unsigned char data, mask;
  66
  67         if (check_range(info, min_uV, max_uV)) {
  68                 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
  69                         min_uV, max_uV);
  70                 return -EINVAL;
  71         }
  72         data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV;
  73         *selector = data;
  74         data <<= info->vol_shift;
  75         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  76
  77         return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
  78 }
  79
  80 static int max8925_get_voltage(struct regulator_dev *rdev)
  81 {
  82         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  83         unsigned char data, mask;
  84         int ret;
  85
  86         ret = max8925_reg_read(info->i2c, info->vol_reg);
  87         if (ret < 0)
  88                 return ret;
  89         mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
  90         data = (ret & mask) >> info->vol_shift;
  91
  92         return max8925_list_voltage(rdev, data);
  93 }
  94
  95 static int max8925_enable(struct regulator_dev *rdev)
  96 {
  97         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  98
  99         return max8925_set_bits(info->i2c, info->enable_reg,
 100                                 OUT_ENABLE << info->enable_bit,
 101                                 OUT_ENABLE << info->enable_bit);
 102 }
 103
 104 static int max8925_disable(struct regulator_dev *rdev)
 105 {
 106         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 107
 108         return max8925_set_bits(info->i2c, info->enable_reg,
 109                                 OUT_ENABLE << info->enable_bit,
 110                                 OUT_DISABLE << info->enable_bit);
 111 }
 112
 113 static int max8925_is_enabled(struct regulator_dev *rdev)
 114 {
 115         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 116         int ret;
 117
 118         ret = max8925_reg_read(info->i2c, info->enable_reg);
 119         if (ret < 0)
 120                 return ret;
 121
 122         return ret & (1 << info->enable_bit);
 123 }
 124
 125 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 126 {
 127         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 128         unsigned char data, mask;
 129
 130         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 131                 return -EINVAL;
 132
 133         data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP;
 134         data <<= SD1_DVM_SHIFT;
 135         mask = 3 << SD1_DVM_SHIFT;
 136
 137         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 138 }
 139
 140 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 141 {
 142         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 143
 144         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 145                                 1 << SD1_DVM_EN);
 146 }
 147
 148 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 149 {
 150         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 151
 152         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 153 }
 154
 155 static struct regulator_ops max8925_regulator_sdv_ops = {
 156         .set_voltage            = max8925_set_voltage,
 157         .get_voltage            = max8925_get_voltage,
 158         .enable                 = max8925_enable,
 159         .disable                = max8925_disable,
 160         .is_enabled             = max8925_is_enabled,
 161         .set_suspend_voltage    = max8925_set_dvm_voltage,
 162         .set_suspend_enable     = max8925_set_dvm_enable,
 163         .set_suspend_disable    = max8925_set_dvm_disable,
 164 };
 165
 166 static struct regulator_ops max8925_regulator_ldo_ops = {
 167         .set_voltage            = max8925_set_voltage,
 168         .get_voltage            = max8925_get_voltage,
 169         .enable                 = max8925_enable,
 170         .disable                = max8925_disable,
 171         .is_enabled             = max8925_is_enabled,
 172 };
 173
 174 #define MAX8925_SDV(_id, min, max, step)                        \
 175 {                                                               \
 176         .desc   = {                                             \
 177                 .name   = "SDV" #_id,                           \
 178                 .ops    = &max8925_regulator_sdv_ops,           \
 179                 .type   = REGULATOR_VOLTAGE,                    \
 180                 .id     = MAX8925_ID_SD##_id,                   \
 181                 .owner  = THIS_MODULE,                          \
 182         },                                                      \
 183         .min_uV         = min * 1000,                           \
 184         .max_uV         = max * 1000,                           \
 185         .step_uV        = step * 1000,                          \
 186         .vol_reg        = MAX8925_SDV##_id,                     \
 187         .vol_shift      = 0,                                    \
 188         .vol_nbits      = 6,                                    \
 189         .enable_reg     = MAX8925_SDCTL##_id,                   \
 190         .enable_bit     = 0,                                    \
 191 }
 192
 193 #define MAX8925_LDO(_id, min, max, step)                        \
 194 {                                                               \
 195         .desc   = {                                             \
 196                 .name   = "LDO" #_id,                           \
 197                 .ops    = &max8925_regulator_ldo_ops,           \
 198                 .type   = REGULATOR_VOLTAGE,                    \
 199                 .id     = MAX8925_ID_LDO##_id,                  \
 200                 .owner  = THIS_MODULE,                          \
 201         },                                                      \
 202         .min_uV         = min * 1000,                           \
 203         .max_uV         = max * 1000,                           \
 204         .step_uV        = step * 1000,                          \
 205         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 206         .vol_shift      = 0,                                    \
 207         .vol_nbits      = 6,                                    \
 208         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 209         .enable_bit     = 0,                                    \
 210 }
 211
 212 static struct max8925_regulator_info max8925_regulator_info[] = {
 213         MAX8925_SDV(1, 637.5, 1425, 12.5),
 214         MAX8925_SDV(2,   650, 2225,   25),
 215         MAX8925_SDV(3,   750, 3900,   50),
 216
 217         MAX8925_LDO(1,  750, 3900, 50),
 218         MAX8925_LDO(2,  650, 2250, 25),
 219         MAX8925_LDO(3,  650, 2250, 25),
 220         MAX8925_LDO(4,  750, 3900, 50),
 221         MAX8925_LDO(5,  750, 3900, 50),
 222         MAX8925_LDO(6,  750, 3900, 50),
 223         MAX8925_LDO(7,  750, 3900, 50),
 224         MAX8925_LDO(8,  750, 3900, 50),
 225         MAX8925_LDO(9,  750, 3900, 50),
 226         MAX8925_LDO(10, 750, 3900, 50),
 227         MAX8925_LDO(11, 750, 3900, 50),
 228         MAX8925_LDO(12, 750, 3900, 50),
 229         MAX8925_LDO(13, 750, 3900, 50),
 230         MAX8925_LDO(14, 750, 3900, 50),
 231         MAX8925_LDO(15, 750, 3900, 50),
 232         MAX8925_LDO(16, 750, 3900, 50),
 233         MAX8925_LDO(17, 650, 2250, 25),
 234         MAX8925_LDO(18, 650, 2250, 25),
 235         MAX8925_LDO(19, 750, 3900, 50),
 236         MAX8925_LDO(20, 750, 3900, 50),
 237 };
 238
 239 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
 240 {
 241         struct max8925_regulator_info *ri;
 242         int i;
 243
 244         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 245                 ri = &max8925_regulator_info[i];
 246                 if (ri->desc.id == id)
 247                         return ri;
 248         }
 249         return NULL;
 250 }
 251
 252 static int __devinit max8925_regulator_probe(struct platform_device *pdev)
 253 {
 254         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 255         struct max8925_platform_data *pdata = chip->dev->platform_data;
 256         struct max8925_regulator_info *ri;
 257         struct regulator_dev *rdev;
 258
 259         ri = find_regulator_info(pdev->id);
 260         if (ri == NULL) {
 261                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 262                 return -EINVAL;
 263         }
 264         ri->i2c = chip->i2c;
 265         ri->chip = chip;
 266
 267         rdev = regulator_register(&ri->desc, &pdev->dev,
 268                                   pdata->regulator[pdev->id], ri);
 269         if (IS_ERR(rdev)) {
 270                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 271                                 ri->desc.name);
 272                 return PTR_ERR(rdev);
 273         }
 274
 275         platform_set_drvdata(pdev, rdev);
 276         return 0;
 277 }
 278
 279 static int __devexit max8925_regulator_remove(struct platform_device *pdev)
 280 {
 281         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 282
 283         platform_set_drvdata(pdev, NULL);
 284         regulator_unregister(rdev);
 285
 286         return 0;
 287 }
 288
 289 static struct platform_driver max8925_regulator_driver = {
 290         .driver         = {
 291                 .name   = "max8925-regulator",
 292                 .owner  = THIS_MODULE,
 293         },
 294         .probe          = max8925_regulator_probe,
 295         .remove         = __devexit_p(max8925_regulator_remove),
 296 };
 297
 298 static int __init max8925_regulator_init(void)
 299 {
 300         return platform_driver_register(&max8925_regulator_driver);
 301 }
 302 subsys_initcall(max8925_regulator_init);
 303
 304 static void __exit max8925_regulator_exit(void)
 305 {
 306         platform_driver_unregister(&max8925_regulator_driver);
 307 }
 308 module_exit(max8925_regulator_exit);
 309
 310 MODULE_LICENSE("GPL");
 311 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 312 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 313 MODULE_ALIAS("platform:max8925-regulator");
 314