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/module.h>
  13 #include <linux/init.h>
  14 #include <linux/err.h>
  15 #include <linux/i2c.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/mfd/max8925.h>
  20
  21 #define SD1_DVM_VMIN            850000
  22 #define SD1_DVM_VMAX            1000000
  23 #define SD1_DVM_STEP            50000
  24 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
  25 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
  26
  27 /* bit definitions in LDO control registers */
  28 #define LDO_SEQ_I2C             0x7             /* Power U/D by i2c */
  29 #define LDO_SEQ_MASK            0x7             /* Power U/D sequence mask */
  30 #define LDO_SEQ_SHIFT           2               /* Power U/D sequence offset */
  31 #define LDO_I2C_EN              0x1             /* Enable by i2c */
  32 #define LDO_I2C_EN_MASK         0x1             /* Enable mask by i2c */
  33 #define LDO_I2C_EN_SHIFT        0               /* Enable offset by i2c */
  34
  35 struct max8925_regulator_info {
  36         struct regulator_desc   desc;
  37         struct regulator_dev    *regulator;
  38         struct i2c_client       *i2c;
  39         struct max8925_chip     *chip;
  40
  41         int     max_uV;
  42         int     vol_reg;
  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->desc.min_uV || min_uV > info->max_uV)
  50                 return -EINVAL;
  51
  52         return 0;
  53 }
  54
  55 static int max8925_set_voltage(struct regulator_dev *rdev,
  56                                int min_uV, int max_uV, unsigned int *selector)
  57 {
  58         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  59         unsigned char data, mask;
  60
  61         if (check_range(info, min_uV, max_uV)) {
  62                 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
  63                         min_uV, max_uV);
  64                 return -EINVAL;
  65         }
  66         data = DIV_ROUND_UP(min_uV - info->desc.min_uV, info->desc.uV_step);
  67         *selector = data;
  68         mask = rdev->desc->n_voltages - 1;
  69
  70         return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
  71 }
  72
  73 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
  74 {
  75         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  76         unsigned char data, mask;
  77         int ret;
  78
  79         ret = max8925_reg_read(info->i2c, info->vol_reg);
  80         if (ret < 0)
  81                 return ret;
  82         mask = rdev->desc->n_voltages - 1;
  83         data = ret & mask;
  84
  85         return data;
  86 }
  87
  88 static int max8925_enable(struct regulator_dev *rdev)
  89 {
  90         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  91
  92         return max8925_set_bits(info->i2c, info->enable_reg,
  93                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  94                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  95                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
  96                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
  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                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 105                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 106                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
 107 }
 108
 109 static int max8925_is_enabled(struct regulator_dev *rdev)
 110 {
 111         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 112         int ldo_seq, ret;
 113
 114         ret = max8925_reg_read(info->i2c, info->enable_reg);
 115         if (ret < 0)
 116                 return ret;
 117         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
 118         if (ldo_seq != LDO_SEQ_I2C)
 119                 return 1;
 120         else
 121                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
 122 }
 123
 124 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 125 {
 126         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 127         unsigned char data, mask;
 128
 129         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 130                 return -EINVAL;
 131
 132         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
 133         data <<= SD1_DVM_SHIFT;
 134         mask = 3 << SD1_DVM_SHIFT;
 135
 136         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 137 }
 138
 139 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 140 {
 141         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 142
 143         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 144                                 1 << SD1_DVM_EN);
 145 }
 146
 147 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 148 {
 149         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 150
 151         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 152 }
 153
 154 static struct regulator_ops max8925_regulator_sdv_ops = {
 155         .list_voltage           = regulator_list_voltage_linear,
 156         .set_voltage            = max8925_set_voltage,
 157         .get_voltage_sel        = max8925_get_voltage_sel,
 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         .list_voltage           = regulator_list_voltage_linear,
 168         .set_voltage            = max8925_set_voltage,
 169         .get_voltage_sel        = max8925_get_voltage_sel,
 170         .enable                 = max8925_enable,
 171         .disable                = max8925_disable,
 172         .is_enabled             = max8925_is_enabled,
 173 };
 174
 175 #define MAX8925_SDV(_id, min, max, step)                        \
 176 {                                                               \
 177         .desc   = {                                             \
 178                 .name   = "SDV" #_id,                           \
 179                 .ops    = &max8925_regulator_sdv_ops,           \
 180                 .type   = REGULATOR_VOLTAGE,                    \
 181                 .id     = MAX8925_ID_SD##_id,                   \
 182                 .owner  = THIS_MODULE,                          \
 183                 .n_voltages = 64,                               \
 184                 .min_uV = min * 1000,                           \
 185                 .uV_step = step * 1000,                         \
 186         },                                                      \
 187         .max_uV         = max * 1000,                           \
 188         .vol_reg        = MAX8925_SDV##_id,                     \
 189         .enable_reg     = MAX8925_SDCTL##_id,                   \
 190 }
 191
 192 #define MAX8925_LDO(_id, min, max, step)                        \
 193 {                                                               \
 194         .desc   = {                                             \
 195                 .name   = "LDO" #_id,                           \
 196                 .ops    = &max8925_regulator_ldo_ops,           \
 197                 .type   = REGULATOR_VOLTAGE,                    \
 198                 .id     = MAX8925_ID_LDO##_id,                  \
 199                 .owner  = THIS_MODULE,                          \
 200                 .n_voltages = 64,                               \
 201                 .min_uV = min * 1000,                           \
 202                 .uV_step = step * 1000,                         \
 203         },                                                      \
 204         .max_uV         = max * 1000,                           \
 205         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 206         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 207 }
 208
 209 static struct max8925_regulator_info max8925_regulator_info[] = {
 210         MAX8925_SDV(1, 637.5, 1425, 12.5),
 211         MAX8925_SDV(2,   650, 2225,   25),
 212         MAX8925_SDV(3,   750, 3900,   50),
 213
 214         MAX8925_LDO(1,  750, 3900, 50),
 215         MAX8925_LDO(2,  650, 2250, 25),
 216         MAX8925_LDO(3,  650, 2250, 25),
 217         MAX8925_LDO(4,  750, 3900, 50),
 218         MAX8925_LDO(5,  750, 3900, 50),
 219         MAX8925_LDO(6,  750, 3900, 50),
 220         MAX8925_LDO(7,  750, 3900, 50),
 221         MAX8925_LDO(8,  750, 3900, 50),
 222         MAX8925_LDO(9,  750, 3900, 50),
 223         MAX8925_LDO(10, 750, 3900, 50),
 224         MAX8925_LDO(11, 750, 3900, 50),
 225         MAX8925_LDO(12, 750, 3900, 50),
 226         MAX8925_LDO(13, 750, 3900, 50),
 227         MAX8925_LDO(14, 750, 3900, 50),
 228         MAX8925_LDO(15, 750, 3900, 50),
 229         MAX8925_LDO(16, 750, 3900, 50),
 230         MAX8925_LDO(17, 650, 2250, 25),
 231         MAX8925_LDO(18, 650, 2250, 25),
 232         MAX8925_LDO(19, 750, 3900, 50),
 233         MAX8925_LDO(20, 750, 3900, 50),
 234 };
 235
 236 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
 237 {
 238         struct max8925_regulator_info *ri;
 239         int i;
 240
 241         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 242                 ri = &max8925_regulator_info[i];
 243                 if (ri->desc.id == id)
 244                         return ri;
 245         }
 246         return NULL;
 247 }
 248
 249 static int __devinit max8925_regulator_probe(struct platform_device *pdev)
 250 {
 251         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 252         struct max8925_platform_data *pdata = chip->dev->platform_data;
 253         struct regulator_config config = { };
 254         struct max8925_regulator_info *ri;
 255         struct regulator_dev *rdev;
 256
 257         ri = find_regulator_info(pdev->id);
 258         if (ri == NULL) {
 259                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 260                 return -EINVAL;
 261         }
 262         ri->i2c = chip->i2c;
 263         ri->chip = chip;
 264
 265         config.dev = &pdev->dev;
 266         config.init_data = pdata->regulator[pdev->id];
 267         config.driver_data = ri;
 268
 269         rdev = regulator_register(&ri->desc, &config);
 270         if (IS_ERR(rdev)) {
 271                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 272                                 ri->desc.name);
 273                 return PTR_ERR(rdev);
 274         }
 275
 276         platform_set_drvdata(pdev, rdev);
 277         return 0;
 278 }
 279
 280 static int __devexit max8925_regulator_remove(struct platform_device *pdev)
 281 {
 282         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 283
 284         platform_set_drvdata(pdev, NULL);
 285         regulator_unregister(rdev);
 286
 287         return 0;
 288 }
 289
 290 static struct platform_driver max8925_regulator_driver = {
 291         .driver         = {
 292                 .name   = "max8925-regulator",
 293                 .owner  = THIS_MODULE,
 294         },
 295         .probe          = max8925_regulator_probe,
 296         .remove         = __devexit_p(max8925_regulator_remove),
 297 };
 298
 299 static int __init max8925_regulator_init(void)
 300 {
 301         return platform_driver_register(&max8925_regulator_driver);
 302 }
 303 subsys_initcall(max8925_regulator_init);
 304
 305 static void __exit max8925_regulator_exit(void)
 306 {
 307         platform_driver_unregister(&max8925_regulator_driver);
 308 }
 309 module_exit(max8925_regulator_exit);
 310
 311 MODULE_LICENSE("GPL");
 312 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 313 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 314 MODULE_ALIAS("platform:max8925-regulator");