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 regulator_dev    *regulator;
  40         struct i2c_client       *i2c;
  41         struct max8925_chip     *chip;
  42
  43         int     vol_reg;
  44         int     enable_reg;
  45 };
  46
  47 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
  48                                    unsigned int selector)
  49 {
  50         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  51         unsigned char mask = rdev->desc->n_voltages - 1;
  52
  53         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
  54 }
  55
  56 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
  57 {
  58         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  59         unsigned char data, mask;
  60         int ret;
  61
  62         ret = max8925_reg_read(info->i2c, info->vol_reg);
  63         if (ret < 0)
  64                 return ret;
  65         mask = rdev->desc->n_voltages - 1;
  66         data = ret & mask;
  67
  68         return data;
  69 }
  70
  71 static int max8925_enable(struct regulator_dev *rdev)
  72 {
  73         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  74
  75         return max8925_set_bits(info->i2c, info->enable_reg,
  76                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  77                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  78                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
  79                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
  80 }
  81
  82 static int max8925_disable(struct regulator_dev *rdev)
  83 {
  84         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  85
  86         return max8925_set_bits(info->i2c, info->enable_reg,
  87                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  88                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  89                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
  90 }
  91
  92 static int max8925_is_enabled(struct regulator_dev *rdev)
  93 {
  94         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  95         int ldo_seq, ret;
  96
  97         ret = max8925_reg_read(info->i2c, info->enable_reg);
  98         if (ret < 0)
  99                 return ret;
 100         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
 101         if (ldo_seq != LDO_SEQ_I2C)
 102                 return 1;
 103         else
 104                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
 105 }
 106
 107 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 108 {
 109         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 110         unsigned char data, mask;
 111
 112         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 113                 return -EINVAL;
 114
 115         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
 116         data <<= SD1_DVM_SHIFT;
 117         mask = 3 << SD1_DVM_SHIFT;
 118
 119         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 120 }
 121
 122 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 123 {
 124         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 125
 126         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 127                                 1 << SD1_DVM_EN);
 128 }
 129
 130 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 131 {
 132         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 133
 134         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 135 }
 136
 137 static struct regulator_ops max8925_regulator_sdv_ops = {
 138         .map_voltage            = regulator_map_voltage_linear,
 139         .list_voltage           = regulator_list_voltage_linear,
 140         .set_voltage_sel        = max8925_set_voltage_sel,
 141         .get_voltage_sel        = max8925_get_voltage_sel,
 142         .enable                 = max8925_enable,
 143         .disable                = max8925_disable,
 144         .is_enabled             = max8925_is_enabled,
 145         .set_suspend_voltage    = max8925_set_dvm_voltage,
 146         .set_suspend_enable     = max8925_set_dvm_enable,
 147         .set_suspend_disable    = max8925_set_dvm_disable,
 148 };
 149
 150 static struct regulator_ops max8925_regulator_ldo_ops = {
 151         .map_voltage            = regulator_map_voltage_linear,
 152         .list_voltage           = regulator_list_voltage_linear,
 153         .set_voltage_sel        = max8925_set_voltage_sel,
 154         .get_voltage_sel        = max8925_get_voltage_sel,
 155         .enable                 = max8925_enable,
 156         .disable                = max8925_disable,
 157         .is_enabled             = max8925_is_enabled,
 158 };
 159
 160 #define MAX8925_SDV(_id, min, max, step)                        \
 161 {                                                               \
 162         .desc   = {                                             \
 163                 .name   = "SDV" #_id,                           \
 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                 .ops    = &max8925_regulator_ldo_ops,           \
 181                 .type   = REGULATOR_VOLTAGE,                    \
 182                 .id     = MAX8925_ID_LDO##_id,                  \
 183                 .owner  = THIS_MODULE,                          \
 184                 .n_voltages = 64,                               \
 185                 .min_uV = min * 1000,                           \
 186                 .uV_step = step * 1000,                         \
 187         },                                                      \
 188         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 189         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 190 }
 191
 192 #ifdef CONFIG_OF
 193 static struct of_regulator_match max8925_regulator_matches[] = {
 194         { .name = "SDV1",},
 195         { .name = "SDV2",},
 196         { .name = "SDV3",},
 197         { .name = "LDO1",},
 198         { .name = "LDO2",},
 199         { .name = "LDO3",},
 200         { .name = "LDO4",},
 201         { .name = "LDO5",},
 202         { .name = "LDO6",},
 203         { .name = "LDO7",},
 204         { .name = "LDO8",},
 205         { .name = "LDO9",},
 206         { .name = "LDO10",},
 207         { .name = "LDO11",},
 208         { .name = "LDO12",},
 209         { .name = "LDO13",},
 210         { .name = "LDO14",},
 211         { .name = "LDO15",},
 212         { .name = "LDO16",},
 213         { .name = "LDO17",},
 214         { .name = "LDO18",},
 215         { .name = "LDO19",},
 216         { .name = "LDO20",},
 217 };
 218 #endif
 219
 220 static struct max8925_regulator_info max8925_regulator_info[] = {
 221         MAX8925_SDV(1, 637.5, 1425, 12.5),
 222         MAX8925_SDV(2,   650, 2225,   25),
 223         MAX8925_SDV(3,   750, 3900,   50),
 224
 225         MAX8925_LDO(1,  750, 3900, 50),
 226         MAX8925_LDO(2,  650, 2250, 25),
 227         MAX8925_LDO(3,  650, 2250, 25),
 228         MAX8925_LDO(4,  750, 3900, 50),
 229         MAX8925_LDO(5,  750, 3900, 50),
 230         MAX8925_LDO(6,  750, 3900, 50),
 231         MAX8925_LDO(7,  750, 3900, 50),
 232         MAX8925_LDO(8,  750, 3900, 50),
 233         MAX8925_LDO(9,  750, 3900, 50),
 234         MAX8925_LDO(10, 750, 3900, 50),
 235         MAX8925_LDO(11, 750, 3900, 50),
 236         MAX8925_LDO(12, 750, 3900, 50),
 237         MAX8925_LDO(13, 750, 3900, 50),
 238         MAX8925_LDO(14, 750, 3900, 50),
 239         MAX8925_LDO(15, 750, 3900, 50),
 240         MAX8925_LDO(16, 750, 3900, 50),
 241         MAX8925_LDO(17, 650, 2250, 25),
 242         MAX8925_LDO(18, 650, 2250, 25),
 243         MAX8925_LDO(19, 750, 3900, 50),
 244         MAX8925_LDO(20, 750, 3900, 50),
 245 };
 246
 247 #ifdef CONFIG_OF
 248 static int max8925_regulator_dt_init(struct platform_device *pdev,
 249                                     struct regulator_config *config,
 250                                     int ridx)
 251 {
 252         struct device_node *nproot, *np;
 253         int rcount;
 254         nproot = of_node_get(pdev->dev.parent->of_node);
 255         if (!nproot)
 256                 return -ENODEV;
 257         np = of_find_node_by_name(nproot, "regulators");
 258         if (!np) {
 259                 dev_err(&pdev->dev, "failed to find regulators node\n");
 260                 return -ENODEV;
 261         }
 262
 263         rcount = of_regulator_match(&pdev->dev, np,
 264                                 &max8925_regulator_matches[ridx], 1);
 265         of_node_put(np);
 266         if (rcount < 0)
 267                 return -ENODEV;
 268         config->init_data =     max8925_regulator_matches[ridx].init_data;
 269         config->of_node = max8925_regulator_matches[ridx].of_node;
 270
 271         return 0;
 272 }
 273 #else
 274 #define max8925_regulator_dt_init(x, y, z)      (-1)
 275 #endif
 276
 277 static int max8925_regulator_probe(struct platform_device *pdev)
 278 {
 279         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 280         struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
 281         struct regulator_config config = { };
 282         struct max8925_regulator_info *ri;
 283         struct resource *res;
 284         struct regulator_dev *rdev;
 285         int i, regulator_idx;
 286
 287         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 288         if (!res) {
 289                 dev_err(&pdev->dev, "No REG resource!\n");
 290                 return -EINVAL;
 291         }
 292         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 293                 ri = &max8925_regulator_info[i];
 294                 if (ri->vol_reg == res->start) {
 295                         regulator_idx = i;
 296                         break;
 297                 }
 298         }
 299
 300         if (i == ARRAY_SIZE(max8925_regulator_info)) {
 301                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
 302                         (unsigned long long)res->start);
 303                 return -EINVAL;
 304         }
 305         ri->i2c = chip->i2c;
 306         ri->chip = chip;
 307
 308         config.dev = &pdev->dev;
 309         config.driver_data = ri;
 310
 311         if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
 312                 if (pdata)
 313                         config.init_data = pdata;
 314
 315         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 316         if (IS_ERR(rdev)) {
 317                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 318                                 ri->desc.name);
 319                 return PTR_ERR(rdev);
 320         }
 321
 322         platform_set_drvdata(pdev, rdev);
 323         return 0;
 324 }
 325
 326 static struct platform_driver max8925_regulator_driver = {
 327         .driver         = {
 328                 .name   = "max8925-regulator",
 329                 .owner  = THIS_MODULE,
 330         },
 331         .probe          = max8925_regulator_probe,
 332 };
 333
 334 static int __init max8925_regulator_init(void)
 335 {
 336         return platform_driver_register(&max8925_regulator_driver);
 337 }
 338 subsys_initcall(max8925_regulator_init);
 339
 340 static void __exit max8925_regulator_exit(void)
 341 {
 342         platform_driver_unregister(&max8925_regulator_driver);
 343 }
 344 module_exit(max8925_regulator_exit);
 345
 346 MODULE_LICENSE("GPL");
 347 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 348 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 349 MODULE_ALIAS("platform:max8925-regulator");