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 /* Charger regulator differences between MAX77693 and MAX77843 */
  37 struct chg_reg_data {
  38         unsigned int linear_reg;
  39         unsigned int linear_mask;
  40         unsigned int uA_step;
  41         unsigned int min_sel;
  42 };
  43
  44 /*
  45  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  46  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  47  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  48  */
  49 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  50 {
  51         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
  52         unsigned int chg_min_uA = rdev->constraints->min_uA;
  53         unsigned int chg_max_uA = rdev->constraints->max_uA;
  54         unsigned int reg, sel;
  55         unsigned int val;
  56         int ret;
  57
  58         ret = regmap_read(rdev->regmap, reg_data->linear_reg, &reg);
  59         if (ret < 0)
  60                 return ret;
  61
  62         sel = reg & reg_data->linear_mask;
  63
  64         /* the first four codes for charger current are all 60mA */
  65         if (sel <= reg_data->min_sel)
  66                 sel = 0;
  67         else
  68                 sel -= reg_data->min_sel;
  69
  70         val = chg_min_uA + reg_data->uA_step * sel;
  71         if (val > chg_max_uA)
  72                 return -EINVAL;
  73
  74         return val;
  75 }
  76
  77 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  78                                                 int min_uA, int max_uA)
  79 {
  80         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
  81         unsigned int chg_min_uA = rdev->constraints->min_uA;
  82         int sel = 0;
  83
  84         while (chg_min_uA + reg_data->uA_step * sel < min_uA)
  85                 sel++;
  86
  87         if (chg_min_uA + reg_data->uA_step * sel > max_uA)
  88                 return -EINVAL;
  89
  90         /* the first four codes for charger current are all 60mA */
  91         sel += reg_data->min_sel;
  92
  93         return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
  94 }
  95 /* end of CHARGER regulator ops */
  96
  97 static const unsigned int max77693_safeout_table[] = {
  98         4850000,
  99         4900000,
 100         4950000,
 101         3300000,
 102 };
 103
 104 static struct regulator_ops max77693_safeout_ops = {
 105         .list_voltage           = regulator_list_voltage_table,
 106         .is_enabled             = regulator_is_enabled_regmap,
 107         .enable                 = regulator_enable_regmap,
 108         .disable                = regulator_disable_regmap,
 109         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 110         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 111 };
 112
 113 static struct regulator_ops max77693_charger_ops = {
 114         .is_enabled             = regulator_is_enabled_regmap,
 115         .enable                 = regulator_enable_regmap,
 116         .disable                = regulator_disable_regmap,
 117         .get_current_limit      = max77693_chg_get_current_limit,
 118         .set_current_limit      = max77693_chg_set_current_limit,
 119 };
 120
 121 #define regulator_desc_esafeout(_num)   {                       \
 122         .name           = "ESAFEOUT"#_num,                      \
 123         .id             = MAX77693_ESAFEOUT##_num,              \
 124         .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
 125         .regulators_node        = of_match_ptr("regulators"),   \
 126         .n_voltages     = 4,                                    \
 127         .ops            = &max77693_safeout_ops,                \
 128         .type           = REGULATOR_VOLTAGE,                    \
 129         .owner          = THIS_MODULE,                          \
 130         .volt_table     = max77693_safeout_table,               \
 131         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 132         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 133         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 134         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 135 }
 136
 137 static const struct regulator_desc regulators[] = {
 138         regulator_desc_esafeout(1),
 139         regulator_desc_esafeout(2),
 140         {
 141                 .name = "CHARGER",
 142                 .id = MAX77693_CHARGER,
 143                 .of_match = of_match_ptr("CHARGER"),
 144                 .regulators_node = of_match_ptr("regulators"),
 145                 .ops = &max77693_charger_ops,
 146                 .type = REGULATOR_CURRENT,
 147                 .owner = THIS_MODULE,
 148                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 149                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 150                                 CHG_CNFG_00_BUCK_MASK,
 151                 .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
 152         },
 153 };
 154
 155 static const struct chg_reg_data max77693_chg_reg_data = {
 156         .linear_reg     = MAX77693_CHG_REG_CHG_CNFG_09,
 157         .linear_mask    = CHG_CNFG_09_CHGIN_ILIM_MASK,
 158         .uA_step        = 20000,
 159         .min_sel        = 3,
 160 };
 161
 162 static int max77693_pmic_probe(struct platform_device *pdev)
 163 {
 164         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 165         int i;
 166         struct regulator_config config = { };
 167
 168         config.dev = iodev->dev;
 169         config.regmap = iodev->regmap;
 170         config.driver_data = (void *)&max77693_chg_reg_data;
 171
 172         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 173                 struct regulator_dev *rdev;
 174
 175                 rdev = devm_regulator_register(&pdev->dev,
 176                                                 &regulators[i], &config);
 177                 if (IS_ERR(rdev)) {
 178                         dev_err(&pdev->dev,
 179                                 "Failed to initialize regulator-%d\n", i);
 180                         return PTR_ERR(rdev);
 181                 }
 182         }
 183
 184         return 0;
 185 }
 186
 187 static const struct platform_device_id max77693_pmic_id[] = {
 188         { "max77693-pmic", TYPE_MAX77693 },
 189         {},
 190 };
 191
 192 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 193
 194 static struct platform_driver max77693_pmic_driver = {
 195         .driver = {
 196                    .name = "max77693-pmic",
 197                    },
 198         .probe = max77693_pmic_probe,
 199         .id_table = max77693_pmic_id,
 200 };
 201
 202 module_platform_driver(max77693_pmic_driver);
 203
 204 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 205 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 206 MODULE_LICENSE("GPL");