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/platform_device.h>
  17#include <linux/regmap.h>
  18#include <linux/regulator/driver.h>
  19#include <linux/slab.h>
  20
  21struct as3711_regulator_info {
  22        struct regulator_desc   desc;
  23        unsigned int            max_uV;
  24};
  25
  26struct as3711_regulator {
  27        struct as3711_regulator_info *reg_info;
  28        struct regulator_dev *rdev;
  29};
  30
  31static int as3711_list_voltage_sd(struct regulator_dev *rdev,
  32                                  unsigned int selector)
  33{
  34        if (selector >= rdev->desc->n_voltages)
  35                return -EINVAL;
  36
  37        if (!selector)
  38                return 0;
  39        if (selector < 0x41)
  40                return 600000 + selector * 12500;
  41        if (selector < 0x71)
  42                return 1400000 + (selector - 0x40) * 25000;
  43        return 2600000 + (selector - 0x70) * 50000;
  44}
  45
  46static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
  47                                    unsigned int selector)
  48{
  49        if (selector >= rdev->desc->n_voltages)
  50                return -EINVAL;
  51
  52        if (selector < 0x10)
  53                return 1200000 + selector * 50000;
  54        return 1800000 + (selector - 0x10) * 100000;
  55}
  56
  57static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
  58                                    unsigned int selector)
  59{
  60        if (selector >= rdev->desc->n_voltages ||
  61            (selector > 0x10 && selector < 0x20))
  62                return -EINVAL;
  63
  64        if (selector < 0x11)
  65                return 900000 + selector * 50000;
  66        return 1750000 + (selector - 0x20) * 50000;
  67}
  68
  69static int as3711_bound_check(struct regulator_dev *rdev,
  70                              int *min_uV, int *max_uV)
  71{
  72        struct as3711_regulator *reg = rdev_get_drvdata(rdev);
  73        struct as3711_regulator_info *info = reg->reg_info;
  74
  75        dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
  76                *min_uV, rdev->desc->min_uV, info->max_uV);
  77
  78        if (*max_uV < *min_uV ||
  79            *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV)
  80                return -EINVAL;
  81
  82        if (rdev->desc->n_voltages == 1)
  83                return 0;
  84
  85        if (*max_uV > info->max_uV)
  86                *max_uV = info->max_uV;
  87
  88        if (*min_uV < rdev->desc->min_uV)
  89                *min_uV = rdev->desc->min_uV;
  90
  91        return *min_uV;
  92}
  93
  94static int as3711_sel_check(int min, int max, int bottom, int step)
  95{
  96        int sel, voltage;
  97
  98        /* Round up min, when dividing: keeps us within the range */
  99        sel = DIV_ROUND_UP(min - bottom, step);
 100        voltage = sel * step + bottom;
 101        pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
 102               min, max, bottom, step, sel);
 103        if (voltage > max)
 104                return -EINVAL;
 105
 106        return sel;
 107}
 108
 109static int as3711_map_voltage_sd(struct regulator_dev *rdev,
 110                                 int min_uV, int max_uV)
 111{
 112        int ret;
 113
 114        ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 115        if (ret <= 0)
 116                return ret;
 117
 118        if (min_uV <= 1400000)
 119                return as3711_sel_check(min_uV, max_uV, 600000, 12500);
 120
 121        if (min_uV <= 2600000)
 122                return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;
 123
 124        return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
 125}
 126
 127/*
 128 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 129 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 130 * FAST:        sdX_fast=1
 131 * NORMAL:      low_noise=1
 132 * IDLE:        low_noise=0
 133 */
 134
 135static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
 136{
 137        unsigned int fast_bit = rdev->desc->enable_mask,
 138                low_noise_bit = fast_bit << 4;
 139        u8 val;
 140
 141        switch (mode) {
 142        case REGULATOR_MODE_FAST:
 143                val = fast_bit | low_noise_bit;
 144                break;
 145        case REGULATOR_MODE_NORMAL:
 146                val = low_noise_bit;
 147                break;
 148        case REGULATOR_MODE_IDLE:
 149                val = 0;
 150                break;
 151        default:
 152                return -EINVAL;
 153        }
 154
 155        return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
 156                                  low_noise_bit | fast_bit, val);
 157}
 158
 159static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
 160{
 161        unsigned int fast_bit = rdev->desc->enable_mask,
 162                low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
 163        unsigned int val;
 164        int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
 165
 166        if (ret < 0)
 167                return ret;
 168
 169        if ((val & mask) == mask)
 170                return REGULATOR_MODE_FAST;
 171
 172        if ((val & mask) == low_noise_bit)
 173                return REGULATOR_MODE_NORMAL;
 174
 175        if (!(val & mask))
 176                return REGULATOR_MODE_IDLE;
 177
 178        return -EINVAL;
 179}
 180
 181static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
 182                                  int min_uV, int max_uV)
 183{
 184        int ret;
 185
 186        ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 187        if (ret <= 0)
 188                return ret;
 189
 190        if (min_uV <= 1800000)
 191                return as3711_sel_check(min_uV, max_uV, 1200000, 50000);
 192
 193        return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
 194}
 195
 196static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
 197                                  int min_uV, int max_uV)
 198{
 199        int ret;
 200
 201        ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 202        if (ret <= 0)
 203                return ret;
 204
 205        if (min_uV <= 1700000)
 206                return as3711_sel_check(min_uV, max_uV, 900000, 50000);
 207
 208        return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
 209}
 210
 211static struct regulator_ops as3711_sd_ops = {
 212        .is_enabled             = regulator_is_enabled_regmap,
 213        .enable                 = regulator_enable_regmap,
 214        .disable                = regulator_disable_regmap,
 215        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 216        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 217        .list_voltage           = as3711_list_voltage_sd,
 218        .map_voltage            = as3711_map_voltage_sd,
 219        .get_mode               = as3711_get_mode_sd,
 220        .set_mode               = as3711_set_mode_sd,
 221};
 222
 223static struct regulator_ops as3711_aldo_ops = {
 224        .is_enabled             = regulator_is_enabled_regmap,
 225        .enable                 = regulator_enable_regmap,
 226        .disable                = regulator_disable_regmap,
 227        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 228        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 229        .list_voltage           = as3711_list_voltage_aldo,
 230        .map_voltage            = as3711_map_voltage_aldo,
 231};
 232
 233static struct regulator_ops as3711_dldo_ops = {
 234        .is_enabled             = regulator_is_enabled_regmap,
 235        .enable                 = regulator_enable_regmap,
 236        .disable                = regulator_disable_regmap,
 237        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 238        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 239        .list_voltage           = as3711_list_voltage_dldo,
 240        .map_voltage            = as3711_map_voltage_dldo,
 241};
 242
 243#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)      \
 244        [AS3711_REGULATOR_ ## _id] = {                                                  \
 245        .desc = {                                                                       \
 246                .name = "as3711-regulator-" # _id,                                      \
 247                .id = AS3711_REGULATOR_ ## _id,                                         \
 248                .n_voltages = (_vmask + 1),                                             \
 249                .ops = &as3711_ ## _sfx ## _ops,                                        \
 250                .type = REGULATOR_VOLTAGE,                                              \
 251                .owner = THIS_MODULE,                                                   \
 252                .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                                 \
 253                .vsel_mask = _vmask << _vshift,                                         \
 254                .enable_reg = AS3711_ ## _en_reg,                                       \
 255                .enable_mask = BIT(_en_bit),                                            \
 256                .min_uV = _min_uV,                                                      \
 257        },                                                                              \
 258        .max_uV = _max_uV,                                                              \
 259}
 260
 261static struct as3711_regulator_info as3711_reg_info[] = {
 262        AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
 263        AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
 264        AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
 265        AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
 266        AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 267        AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 268        AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 269        AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 270        AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 271        AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 272        AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 273        AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 274        /* StepUp output voltage depends on supplying regulator */
 275};
 276
 277#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 278
 279static int as3711_regulator_probe(struct platform_device *pdev)
 280{
 281        struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 282        struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 283        struct regulator_init_data *reg_data;
 284        struct regulator_config config = {.dev = &pdev->dev,};
 285        struct as3711_regulator *reg = NULL;
 286        struct as3711_regulator *regs;
 287        struct regulator_dev *rdev;
 288        struct as3711_regulator_info *ri;
 289        int ret;
 290        int id;
 291
 292        if (!pdata)
 293                dev_dbg(&pdev->dev, "No platform data...\n");
 294
 295        regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
 296                        sizeof(struct as3711_regulator), GFP_KERNEL);
 297        if (!regs) {
 298                dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 299                return -ENOMEM;
 300        }
 301
 302        for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 303                reg_data = pdata ? pdata->init_data[id] : NULL;
 304
 305                /* No need to register if there is no regulator data */
 306                if (!ri->desc.name)
 307                        continue;
 308
 309                reg = &regs[id];
 310                reg->reg_info = ri;
 311
 312                config.init_data = reg_data;
 313                config.driver_data = reg;
 314                config.regmap = as3711->regmap;
 315
 316                rdev = regulator_register(&ri->desc, &config);
 317                if (IS_ERR(rdev)) {
 318                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
 319                                ri->desc.name);
 320                        ret = PTR_ERR(rdev);
 321                        goto eregreg;
 322                }
 323                reg->rdev = rdev;
 324        }
 325        platform_set_drvdata(pdev, regs);
 326        return 0;
 327
 328eregreg:
 329        while (--id >= 0)
 330                regulator_unregister(regs[id].rdev);
 331
 332        return ret;
 333}
 334
 335static int as3711_regulator_remove(struct platform_device *pdev)
 336{
 337        struct as3711_regulator *regs = platform_get_drvdata(pdev);
 338        int id;
 339
 340        for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
 341                regulator_unregister(regs[id].rdev);
 342        return 0;
 343}
 344
 345static struct platform_driver as3711_regulator_driver = {
 346        .driver = {
 347                .name   = "as3711-regulator",
 348                .owner  = THIS_MODULE,
 349        },
 350        .probe          = as3711_regulator_probe,
 351        .remove         = as3711_regulator_remove,
 352};
 353
 354static int __init as3711_regulator_init(void)
 355{
 356        return platform_driver_register(&as3711_regulator_driver);
 357}
 358subsys_initcall(as3711_regulator_init);
 359
 360static void __exit as3711_regulator_exit(void)
 361{
 362        platform_driver_unregister(&as3711_regulator_driver);
 363}
 364module_exit(as3711_regulator_exit);
 365
 366MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 367MODULE_DESCRIPTION("AS3711 regulator driver");
 368MODULE_ALIAS("platform:as3711-regulator");
 369MODULE_LICENSE("GPL v2");
 370
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