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 #include <linux/of.h>
  21 #include <linux/regulator/of_regulator.h>
  22
  23 #define SD1_DVM_VMIN            850000
  24 #define SD1_DVM_VMAX            1000000
  25 #define SD1_DVM_STEP            50000
  26 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
  27 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
  28
  29 /* bit definitions in LDO control registers */
  30 #define LDO_SEQ_I2C             0x7             /* Power U/D by i2c */
  31 #define LDO_SEQ_MASK            0x7             /* Power U/D sequence mask */
  32 #define LDO_SEQ_SHIFT           2               /* Power U/D sequence offset */
  33 #define LDO_I2C_EN              0x1             /* Enable by i2c */
  34 #define LDO_I2C_EN_MASK         0x1             /* Enable mask by i2c */
  35 #define LDO_I2C_EN_SHIFT        0               /* Enable offset by i2c */
  36
  37 struct max8925_regulator_info {
  38         struct regulator_desc   desc;
  39         struct i2c_client       *i2c;
  40
  41         int     vol_reg;
  42         int     enable_reg;
  43 };
  44
  45 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
  46                                    unsigned int selector)
  47 {
  48         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  49         unsigned char mask = rdev->desc->n_voltages - 1;
  50
  51         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
  52 }
  53
  54 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
  55 {
  56         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  57         unsigned char data, mask;
  58         int ret;
  59
  60         ret = max8925_reg_read(info->i2c, info->vol_reg);
  61         if (ret < 0)
  62                 return ret;
  63         mask = rdev->desc->n_voltages - 1;
  64         data = ret & mask;
  65
  66         return data;
  67 }
  68
  69 static int max8925_enable(struct regulator_dev *rdev)
  70 {
  71         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  72
  73         return max8925_set_bits(info->i2c, info->enable_reg,
  74                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  75                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  76                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
  77                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
  78 }
  79
  80 static int max8925_disable(struct regulator_dev *rdev)
  81 {
  82         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  83
  84         return max8925_set_bits(info->i2c, info->enable_reg,
  85                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  86                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  87                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
  88 }
  89
  90 static int max8925_is_enabled(struct regulator_dev *rdev)
  91 {
  92         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  93         int ldo_seq, ret;
  94
  95         ret = max8925_reg_read(info->i2c, info->enable_reg);
  96         if (ret < 0)
  97                 return ret;
  98         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
  99         if (ldo_seq != LDO_SEQ_I2C)
 100                 return 1;
 101         else
 102                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
 103 }
 104
 105 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 106 {
 107         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 108         unsigned char data, mask;
 109
 110         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 111                 return -EINVAL;
 112
 113         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
 114         data <<= SD1_DVM_SHIFT;
 115         mask = 3 << SD1_DVM_SHIFT;
 116
 117         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 118 }
 119
 120 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 121 {
 122         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 123
 124         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 125                                 1 << SD1_DVM_EN);
 126 }
 127
 128 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 129 {
 130         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 131
 132         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 133 }
 134
 135 static const struct regulator_ops max8925_regulator_sdv_ops = {
 136         .map_voltage            = regulator_map_voltage_linear,
 137         .list_voltage           = regulator_list_voltage_linear,
 138         .set_voltage_sel        = max8925_set_voltage_sel,
 139         .get_voltage_sel        = max8925_get_voltage_sel,
 140         .enable                 = max8925_enable,
 141         .disable                = max8925_disable,
 142         .is_enabled             = max8925_is_enabled,
 143         .set_suspend_voltage    = max8925_set_dvm_voltage,
 144         .set_suspend_enable     = max8925_set_dvm_enable,
 145         .set_suspend_disable    = max8925_set_dvm_disable,
 146 };
 147
 148 static const struct regulator_ops max8925_regulator_ldo_ops = {
 149         .map_voltage            = regulator_map_voltage_linear,
 150         .list_voltage           = regulator_list_voltage_linear,
 151         .set_voltage_sel        = max8925_set_voltage_sel,
 152         .get_voltage_sel        = max8925_get_voltage_sel,
 153         .enable                 = max8925_enable,
 154         .disable                = max8925_disable,
 155         .is_enabled             = max8925_is_enabled,
 156 };
 157
 158 #define MAX8925_SDV(_id, min, max, step)                        \
 159 {                                                               \
 160         .desc   = {                                             \
 161                 .name   = "SDV" #_id,                           \
 162                 .of_match = of_match_ptr("SDV" #_id),           \
 163                 .regulators_node = of_match_ptr("regulators"),  \
 164                 .ops    = &max8925_regulator_sdv_ops,           \
 165                 .type   = REGULATOR_VOLTAGE,                    \
 166                 .id     = MAX8925_ID_SD##_id,                   \
 167                 .owner  = THIS_MODULE,                          \
 168                 .n_voltages = 64,                               \
 169                 .min_uV = min * 1000,                           \
 170                 .uV_step = step * 1000,                         \
 171         },                                                      \
 172         .vol_reg        = MAX8925_SDV##_id,                     \
 173         .enable_reg     = MAX8925_SDCTL##_id,                   \
 174 }
 175
 176 #define MAX8925_LDO(_id, min, max, step)                        \
 177 {                                                               \
 178         .desc   = {                                             \
 179                 .name   = "LDO" #_id,                           \
 180                 .of_match = of_match_ptr("LDO" #_id),           \
 181                 .regulators_node = of_match_ptr("regulators"),  \
 182                 .ops    = &max8925_regulator_ldo_ops,           \
 183                 .type   = REGULATOR_VOLTAGE,                    \
 184                 .id     = MAX8925_ID_LDO##_id,                  \
 185                 .owner  = THIS_MODULE,                          \
 186                 .n_voltages = 64,                               \
 187                 .min_uV = min * 1000,                           \
 188                 .uV_step = step * 1000,                         \
 189         },                                                      \
 190         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 191         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 192 }
 193
 194 static struct max8925_regulator_info max8925_regulator_info[] = {
 195         MAX8925_SDV(1, 637.5, 1425, 12.5),
 196         MAX8925_SDV(2,   650, 2225,   25),
 197         MAX8925_SDV(3,   750, 3900,   50),
 198
 199         MAX8925_LDO(1,  750, 3900, 50),
 200         MAX8925_LDO(2,  650, 2250, 25),
 201         MAX8925_LDO(3,  650, 2250, 25),
 202         MAX8925_LDO(4,  750, 3900, 50),
 203         MAX8925_LDO(5,  750, 3900, 50),
 204         MAX8925_LDO(6,  750, 3900, 50),
 205         MAX8925_LDO(7,  750, 3900, 50),
 206         MAX8925_LDO(8,  750, 3900, 50),
 207         MAX8925_LDO(9,  750, 3900, 50),
 208         MAX8925_LDO(10, 750, 3900, 50),
 209         MAX8925_LDO(11, 750, 3900, 50),
 210         MAX8925_LDO(12, 750, 3900, 50),
 211         MAX8925_LDO(13, 750, 3900, 50),
 212         MAX8925_LDO(14, 750, 3900, 50),
 213         MAX8925_LDO(15, 750, 3900, 50),
 214         MAX8925_LDO(16, 750, 3900, 50),
 215         MAX8925_LDO(17, 650, 2250, 25),
 216         MAX8925_LDO(18, 650, 2250, 25),
 217         MAX8925_LDO(19, 750, 3900, 50),
 218         MAX8925_LDO(20, 750, 3900, 50),
 219 };
 220
 221 static int max8925_regulator_probe(struct platform_device *pdev)
 222 {
 223         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 224         struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
 225         struct regulator_config config = { };
 226         struct max8925_regulator_info *ri;
 227         struct resource *res;
 228         struct regulator_dev *rdev;
 229         int i;
 230
 231         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 232         if (!res) {
 233                 dev_err(&pdev->dev, "No REG resource!\n");
 234                 return -EINVAL;
 235         }
 236         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 237                 ri = &max8925_regulator_info[i];
 238                 if (ri->vol_reg == res->start)
 239                         break;
 240         }
 241
 242         if (i == ARRAY_SIZE(max8925_regulator_info)) {
 243                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
 244                         (unsigned long long)res->start);
 245                 return -EINVAL;
 246         }
 247         ri->i2c = chip->i2c;
 248
 249         config.dev = chip->dev;
 250         config.driver_data = ri;
 251
 252         if (pdata)
 253                 config.init_data = pdata;
 254
 255         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 256         if (IS_ERR(rdev)) {
 257                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 258                                 ri->desc.name);
 259                 return PTR_ERR(rdev);
 260         }
 261
 262         platform_set_drvdata(pdev, rdev);
 263         return 0;
 264 }
 265
 266 static struct platform_driver max8925_regulator_driver = {
 267         .driver         = {
 268                 .name   = "max8925-regulator",
 269         },
 270         .probe          = max8925_regulator_probe,
 271 };
 272
 273 static int __init max8925_regulator_init(void)
 274 {
 275         return platform_driver_register(&max8925_regulator_driver);
 276 }
 277 subsys_initcall(max8925_regulator_init);
 278
 279 static void __exit max8925_regulator_exit(void)
 280 {
 281         platform_driver_unregister(&max8925_regulator_driver);
 282 }
 283 module_exit(max8925_regulator_exit);
 284
 285 MODULE_LICENSE("GPL");
 286 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 287 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 288 MODULE_ALIAS("platform:max8925-regulator");