LXR linux/drivers/regulator/max77693.c

   1/*
   2 * max77693.c - Regulator driver for the Maxim 77693
   3 *
   4 * Copyright (C) 2013 Samsung Electronics
   5 * Jonghwa Lee <jonghwa3.lee@samsung.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 as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 *
  21 * This driver is based on max77686.c
  22 */
  23
  24#include <linux/err.h>
  25#include <linux/slab.h>
  26#include <linux/platform_device.h>
  27#include <linux/module.h>
  28#include <linux/export.h>
  29#include <linux/regulator/driver.h>
  30#include <linux/regulator/machine.h>
  31#include <linux/mfd/max77693.h>
  32#include <linux/mfd/max77693-private.h>
  33#include <linux/regulator/of_regulator.h>
  34#include <linux/regmap.h>
  35
  36#define CHGIN_ILIM_STEP_20mA                    20000
  37
  38/*
  39 * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  40 * 0x00, 0x01, 0x2, 0x03        = 60 mA
  41 * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  42 */
  43static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  44{
  45        unsigned int chg_min_uA = rdev->constraints->min_uA;
  46        unsigned int chg_max_uA = rdev->constraints->max_uA;
  47        unsigned int reg, sel;
  48        unsigned int val;
  49        int ret;
  50
  51        ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, &reg);
  52        if (ret < 0)
  53                return ret;
  54
  55        sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
  56
  57        /* the first four codes for charger current are all 60mA */
  58        if (sel <= 3)
  59                sel = 0;
  60        else
  61                sel -= 3;
  62
  63        val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
  64        if (val > chg_max_uA)
  65                return -EINVAL;
  66
  67        return val;
  68}
  69
  70static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  71                                                int min_uA, int max_uA)
  72{
  73        unsigned int chg_min_uA = rdev->constraints->min_uA;
  74        int sel = 0;
  75
  76        while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
  77                sel++;
  78
  79        if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
  80                return -EINVAL;
  81
  82        /* the first four codes for charger current are all 60mA */
  83        sel += 3;
  84
  85        return regmap_write(rdev->regmap,
  86                                MAX77693_CHG_REG_CHG_CNFG_09, sel);
  87}
  88/* end of CHARGER regulator ops */
  89
  90static const unsigned int max77693_safeout_table[] = {
  91        4850000,
  92        4900000,
  93        4950000,
  94        3300000,
  95};
  96
  97static struct regulator_ops max77693_safeout_ops = {
  98        .list_voltage           = regulator_list_voltage_table,
  99        .is_enabled             = regulator_is_enabled_regmap,
 100        .enable                 = regulator_enable_regmap,
 101        .disable                = regulator_disable_regmap,
 102        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 103        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 104};
 105
 106static struct regulator_ops max77693_charger_ops = {
 107        .is_enabled             = regulator_is_enabled_regmap,
 108        .enable                 = regulator_enable_regmap,
 109        .disable                = regulator_disable_regmap,
 110        .get_current_limit      = max77693_chg_get_current_limit,
 111        .set_current_limit      = max77693_chg_set_current_limit,
 112};
 113
 114#define regulator_desc_esafeout(_num)   {                       \
 115        .name           = "ESAFEOUT"#_num,                      \
 116        .id             = MAX77693_ESAFEOUT##_num,              \
 117        .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
 118        .regulators_node        = of_match_ptr("regulators"),   \
 119        .n_voltages     = 4,                                    \
 120        .ops            = &max77693_safeout_ops,                \
 121        .type           = REGULATOR_VOLTAGE,                    \
 122        .owner          = THIS_MODULE,                          \
 123        .volt_table     = max77693_safeout_table,               \
 124        .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 125        .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 126        .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 127        .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 128}
 129
 130static const struct regulator_desc regulators[] = {
 131        regulator_desc_esafeout(1),
 132        regulator_desc_esafeout(2),
 133        {
 134                .name = "CHARGER",
 135                .id = MAX77693_CHARGER,
 136                .of_match = of_match_ptr("CHARGER"),
 137                .regulators_node = of_match_ptr("regulators"),
 138                .ops = &max77693_charger_ops,
 139                .type = REGULATOR_CURRENT,
 140                .owner = THIS_MODULE,
 141                .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 142                .enable_mask = CHG_CNFG_00_CHG_MASK |
 143                                CHG_CNFG_00_BUCK_MASK,
 144                .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
 145        },
 146};
 147
 148static int max77693_pmic_probe(struct platform_device *pdev)
 149{
 150        struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 151        int i;
 152        struct regulator_config config = { };
 153
 154        config.dev = iodev->dev;
 155        config.regmap = iodev->regmap;
 156
 157        for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 158                struct regulator_dev *rdev;
 159
 160                rdev = devm_regulator_register(&pdev->dev,
 161                                                &regulators[i], &config);
 162                if (IS_ERR(rdev)) {
 163                        dev_err(&pdev->dev,
 164                                "Failed to initialize regulator-%d\n", i);
 165                        return PTR_ERR(rdev);
 166                }
 167        }
 168
 169        return 0;
 170}
 171
 172static const struct platform_device_id max77693_pmic_id[] = {
 173        {"max77693-pmic", 0},
 174        {},
 175};
 176
 177MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 178
 179static struct platform_driver max77693_pmic_driver = {
 180        .driver = {
 181                   .name = "max77693-pmic",
 182                   },
 183        .probe = max77693_pmic_probe,
 184        .id_table = max77693_pmic_id,
 185};
 186
 187module_platform_driver(max77693_pmic_driver);
 188
 189MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 190MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 191MODULE_LICENSE("GPL");
 192