linux/drivers/regulator/max8925-regulator.c
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   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
  37struct 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
  47static 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
  56static 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
  71static 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
  82static 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
  92static 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
 107static 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
 122static 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
 130static 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
 137static 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
 150static 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
 193static 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
 220static 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
 248static int max8925_regulator_dt_init(struct platform_device *pdev,
 249                                    struct max8925_regulator_info *info,
 250                                    struct regulator_config *config,
 251                                    int ridx)
 252{
 253        struct device_node *nproot, *np;
 254        int rcount;
 255        nproot = pdev->dev.parent->of_node;
 256        if (!nproot)
 257                return -ENODEV;
 258        np = of_find_node_by_name(nproot, "regulators");
 259        if (!np) {
 260                dev_err(&pdev->dev, "failed to find regulators node\n");
 261                return -ENODEV;
 262        }
 263
 264        rcount = of_regulator_match(&pdev->dev, np,
 265                                &max8925_regulator_matches[ridx], 1);
 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(w, x, y, z)   (-1)
 275#endif
 276
 277static 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 = pdev->dev.platform_data;
 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, ri, &config, regulator_idx))
 312                if (pdata)
 313                        config.init_data = pdata;
 314
 315        rdev = regulator_register(&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
 326static int max8925_regulator_remove(struct platform_device *pdev)
 327{
 328        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 329
 330        platform_set_drvdata(pdev, NULL);
 331        regulator_unregister(rdev);
 332
 333        return 0;
 334}
 335
 336static struct platform_driver max8925_regulator_driver = {
 337        .driver         = {
 338                .name   = "max8925-regulator",
 339                .owner  = THIS_MODULE,
 340        },
 341        .probe          = max8925_regulator_probe,
 342        .remove         = max8925_regulator_remove,
 343};
 344
 345static int __init max8925_regulator_init(void)
 346{
 347        return platform_driver_register(&max8925_regulator_driver);
 348}
 349subsys_initcall(max8925_regulator_init);
 350
 351static void __exit max8925_regulator_exit(void)
 352{
 353        platform_driver_unregister(&max8925_regulator_driver);
 354}
 355module_exit(max8925_regulator_exit);
 356
 357MODULE_LICENSE("GPL");
 358MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 359MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 360MODULE_ALIAS("platform:max8925-regulator");
 361
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