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  */
  43 static 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
  70 static 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
  90 static const unsigned int max77693_safeout_table[] = {
  91         4850000,
  92         4900000,
  93         4950000,
  94         3300000,
  95 };
  96
  97 static 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
 106 static 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
 130 static 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
 148 static 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
 172 static const struct platform_device_id max77693_pmic_id[] = {
 173         {"max77693-pmic", 0},
 174         {},
 175 };
 176
 177 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 178
 179 static 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
 187 module_platform_driver(max77693_pmic_driver);
 188
 189 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 190 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 191 MODULE_LICENSE("GPL");