linux/drivers/regulator/as3711-regulator.c
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   1/*
   2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
   3 *
   4 * Copyright (C) 2012 Renesas Electronics Corporation
   5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the version 2 of the GNU General Public License as
   9 * published by the Free Software Foundation
  10 */
  11
  12#include <linux/err.h>
  13#include <linux/init.h>
  14#include <linux/mfd/as3711.h>
  15#include <linux/module.h>
  16#include <linux/of.h>
  17#include <linux/platform_device.h>
  18#include <linux/regmap.h>
  19#include <linux/regulator/driver.h>
  20#include <linux/regulator/of_regulator.h>
  21#include <linux/slab.h>
  22
  23struct as3711_regulator_info {
  24        struct regulator_desc   desc;
  25        unsigned int            max_uV;
  26};
  27
  28struct as3711_regulator {
  29        struct as3711_regulator_info *reg_info;
  30        struct regulator_dev *rdev;
  31};
  32
  33/*
  34 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
  35 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
  36 * FAST:        sdX_fast=1
  37 * NORMAL:      low_noise=1
  38 * IDLE:        low_noise=0
  39 */
  40
  41static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
  42{
  43        unsigned int fast_bit = rdev->desc->enable_mask,
  44                low_noise_bit = fast_bit << 4;
  45        u8 val;
  46
  47        switch (mode) {
  48        case REGULATOR_MODE_FAST:
  49                val = fast_bit | low_noise_bit;
  50                break;
  51        case REGULATOR_MODE_NORMAL:
  52                val = low_noise_bit;
  53                break;
  54        case REGULATOR_MODE_IDLE:
  55                val = 0;
  56                break;
  57        default:
  58                return -EINVAL;
  59        }
  60
  61        return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
  62                                  low_noise_bit | fast_bit, val);
  63}
  64
  65static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
  66{
  67        unsigned int fast_bit = rdev->desc->enable_mask,
  68                low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
  69        unsigned int val;
  70        int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
  71
  72        if (ret < 0)
  73                return ret;
  74
  75        if ((val & mask) == mask)
  76                return REGULATOR_MODE_FAST;
  77
  78        if ((val & mask) == low_noise_bit)
  79                return REGULATOR_MODE_NORMAL;
  80
  81        if (!(val & mask))
  82                return REGULATOR_MODE_IDLE;
  83
  84        return -EINVAL;
  85}
  86
  87static struct regulator_ops as3711_sd_ops = {
  88        .is_enabled             = regulator_is_enabled_regmap,
  89        .enable                 = regulator_enable_regmap,
  90        .disable                = regulator_disable_regmap,
  91        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  92        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  93        .list_voltage           = regulator_list_voltage_linear_range,
  94        .map_voltage            = regulator_map_voltage_linear_range,
  95        .get_mode               = as3711_get_mode_sd,
  96        .set_mode               = as3711_set_mode_sd,
  97};
  98
  99static struct regulator_ops as3711_aldo_ops = {
 100        .is_enabled             = regulator_is_enabled_regmap,
 101        .enable                 = regulator_enable_regmap,
 102        .disable                = regulator_disable_regmap,
 103        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 104        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 105        .list_voltage           = regulator_list_voltage_linear_range,
 106        .map_voltage            = regulator_map_voltage_linear_range,
 107};
 108
 109static struct regulator_ops as3711_dldo_ops = {
 110        .is_enabled             = regulator_is_enabled_regmap,
 111        .enable                 = regulator_enable_regmap,
 112        .disable                = regulator_disable_regmap,
 113        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 114        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 115        .list_voltage           = regulator_list_voltage_linear_range,
 116        .map_voltage            = regulator_map_voltage_linear_range,
 117};
 118
 119static const struct regulator_linear_range as3711_sd_ranges[] = {
 120        { .min_uV = 612500, .max_uV = 1400000,
 121          .min_sel = 0x1, .max_sel = 0x40, .uV_step = 12500 },
 122        { .min_uV = 1425000, .max_uV = 2600000,
 123          .min_sel = 0x41, .max_sel = 0x70, .uV_step = 25000 },
 124        { .min_uV = 2650000, .max_uV = 3350000,
 125          .min_sel = 0x71, .max_sel = 0x7f, .uV_step = 50000 },
 126};
 127
 128static const struct regulator_linear_range as3711_aldo_ranges[] = {
 129        { .min_uV = 1200000, .max_uV = 1950000,
 130          .min_sel = 0, .max_sel = 0xf, .uV_step = 50000 },
 131        { .min_uV = 1800000, .max_uV = 3300000,
 132          .min_sel = 0x10, .max_sel = 0x1f, .uV_step = 100000 },
 133};
 134
 135static const struct regulator_linear_range as3711_dldo_ranges[] = {
 136        { .min_uV = 900000, .max_uV = 1700000,
 137          .min_sel = 0, .max_sel = 0x10, .uV_step = 50000 },
 138        { .min_uV = 1750000, .max_uV = 3300000,
 139          .min_sel = 0x20, .max_sel = 0x3f, .uV_step = 50000 },
 140};
 141
 142#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)      \
 143        [AS3711_REGULATOR_ ## _id] = {                                                  \
 144        .desc = {                                                                       \
 145                .name = "as3711-regulator-" # _id,                                      \
 146                .id = AS3711_REGULATOR_ ## _id,                                         \
 147                .n_voltages = (_vmask + 1),                                             \
 148                .ops = &as3711_ ## _sfx ## _ops,                                        \
 149                .type = REGULATOR_VOLTAGE,                                              \
 150                .owner = THIS_MODULE,                                                   \
 151                .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                                 \
 152                .vsel_mask = _vmask << _vshift,                                         \
 153                .enable_reg = AS3711_ ## _en_reg,                                       \
 154                .enable_mask = BIT(_en_bit),                                            \
 155                .min_uV = _min_uV,                                                      \
 156                .linear_ranges = as3711_ ## _sfx ## _ranges,                            \
 157                .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges),              \
 158        },                                                                              \
 159        .max_uV = _max_uV,                                                              \
 160}
 161
 162static struct as3711_regulator_info as3711_reg_info[] = {
 163        AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
 164        AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
 165        AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
 166        AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
 167        AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 168        AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 169        AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 170        AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 171        AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 172        AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 173        AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 174        AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 175        /* StepUp output voltage depends on supplying regulator */
 176};
 177
 178#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 179
 180static struct of_regulator_match
 181as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 182        [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 183        [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 184        [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 185        [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 186        [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 187        [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 188        [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 189        [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 190        [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 191        [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 192        [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 193        [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 194};
 195
 196static int as3711_regulator_parse_dt(struct device *dev,
 197                                struct device_node **of_node, const int count)
 198{
 199        struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 200        struct device_node *regulators =
 201                of_find_node_by_name(dev->parent->of_node, "regulators");
 202        struct of_regulator_match *match;
 203        int ret, i;
 204
 205        if (!regulators) {
 206                dev_err(dev, "regulator node not found\n");
 207                return -ENODEV;
 208        }
 209
 210        ret = of_regulator_match(dev->parent, regulators,
 211                                 as3711_regulator_matches, count);
 212        of_node_put(regulators);
 213        if (ret < 0) {
 214                dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 215                return ret;
 216        }
 217
 218        for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 219                if (match->of_node) {
 220                        pdata->init_data[i] = match->init_data;
 221                        of_node[i] = match->of_node;
 222                }
 223
 224        return 0;
 225}
 226
 227static int as3711_regulator_probe(struct platform_device *pdev)
 228{
 229        struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 230        struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 231        struct regulator_init_data *reg_data;
 232        struct regulator_config config = {.dev = &pdev->dev,};
 233        struct as3711_regulator *reg = NULL;
 234        struct as3711_regulator *regs;
 235        struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 236        struct regulator_dev *rdev;
 237        struct as3711_regulator_info *ri;
 238        int ret;
 239        int id;
 240
 241        if (!pdata) {
 242                dev_err(&pdev->dev, "No platform data...\n");
 243                return -ENODEV;
 244        }
 245
 246        if (pdev->dev.parent->of_node) {
 247                ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 248                if (ret < 0) {
 249                        dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 250                        return ret;
 251                }
 252        }
 253
 254        regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
 255                        sizeof(struct as3711_regulator), GFP_KERNEL);
 256        if (!regs) {
 257                dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 258                return -ENOMEM;
 259        }
 260
 261        for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 262                reg_data = pdata->init_data[id];
 263
 264                /* No need to register if there is no regulator data */
 265                if (!reg_data)
 266                        continue;
 267
 268                reg = &regs[id];
 269                reg->reg_info = ri;
 270
 271                config.init_data = reg_data;
 272                config.driver_data = reg;
 273                config.regmap = as3711->regmap;
 274                config.of_node = of_node[id];
 275
 276                rdev = regulator_register(&ri->desc, &config);
 277                if (IS_ERR(rdev)) {
 278                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
 279                                ri->desc.name);
 280                        ret = PTR_ERR(rdev);
 281                        goto eregreg;
 282                }
 283                reg->rdev = rdev;
 284        }
 285        platform_set_drvdata(pdev, regs);
 286        return 0;
 287
 288eregreg:
 289        while (--id >= 0)
 290                regulator_unregister(regs[id].rdev);
 291
 292        return ret;
 293}
 294
 295static int as3711_regulator_remove(struct platform_device *pdev)
 296{
 297        struct as3711_regulator *regs = platform_get_drvdata(pdev);
 298        int id;
 299
 300        for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
 301                regulator_unregister(regs[id].rdev);
 302        return 0;
 303}
 304
 305static struct platform_driver as3711_regulator_driver = {
 306        .driver = {
 307                .name   = "as3711-regulator",
 308                .owner  = THIS_MODULE,
 309        },
 310        .probe          = as3711_regulator_probe,
 311        .remove         = as3711_regulator_remove,
 312};
 313
 314static int __init as3711_regulator_init(void)
 315{
 316        return platform_driver_register(&as3711_regulator_driver);
 317}
 318subsys_initcall(as3711_regulator_init);
 319
 320static void __exit as3711_regulator_exit(void)
 321{
 322        platform_driver_unregister(&as3711_regulator_driver);
 323}
 324module_exit(as3711_regulator_exit);
 325
 326MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 327MODULE_DESCRIPTION("AS3711 regulator driver");
 328MODULE_ALIAS("platform:as3711-regulator");
 329MODULE_LICENSE("GPL v2");
 330
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