kernel/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 /* CHARGER regulator ops */
  39 /* CHARGER regulator uses two bits for enabling */
  40 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
  41 {
  42         int ret;
  43         unsigned int val;
  44
  45         ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
  46         if (ret)
  47                 return ret;
  48
  49         return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
  50 }
  51
  52 /*
  53  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  54  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  55  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  56  */
  57 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  58 {
  59         unsigned int chg_min_uA = rdev->constraints->min_uA;
  60         unsigned int chg_max_uA = rdev->constraints->max_uA;
  61         unsigned int reg, sel;
  62         unsigned int val;
  63         int ret;
  64
  65         ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, &reg);
  66         if (ret < 0)
  67                 return ret;
  68
  69         sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
  70
  71         /* the first four codes for charger current are all 60mA */
  72         if (sel <= 3)
  73                 sel = 0;
  74         else
  75                 sel -= 3;
  76
  77         val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
  78         if (val > chg_max_uA)
  79                 return -EINVAL;
  80
  81         return val;
  82 }
  83
  84 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  85                                                 int min_uA, int max_uA)
  86 {
  87         unsigned int chg_min_uA = rdev->constraints->min_uA;
  88         int sel = 0;
  89
  90         while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
  91                 sel++;
  92
  93         if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
  94                 return -EINVAL;
  95
  96         /* the first four codes for charger current are all 60mA */
  97         sel += 3;
  98
  99         return regmap_write(rdev->regmap,
 100                                 MAX77693_CHG_REG_CHG_CNFG_09, sel);
 101 }
 102 /* end of CHARGER regulator ops */
 103
 104 static const unsigned int max77693_safeout_table[] = {
 105         4850000,
 106         4900000,
 107         4950000,
 108         3300000,
 109 };
 110
 111 static struct regulator_ops max77693_safeout_ops = {
 112         .list_voltage           = regulator_list_voltage_table,
 113         .is_enabled             = regulator_is_enabled_regmap,
 114         .enable                 = regulator_enable_regmap,
 115         .disable                = regulator_disable_regmap,
 116         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 117         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 118 };
 119
 120 static struct regulator_ops max77693_charger_ops = {
 121         .is_enabled             = max77693_chg_is_enabled,
 122         .enable                 = regulator_enable_regmap,
 123         .disable                = regulator_disable_regmap,
 124         .get_current_limit      = max77693_chg_get_current_limit,
 125         .set_current_limit      = max77693_chg_set_current_limit,
 126 };
 127
 128 #define regulator_desc_esafeout(_num)   {                       \
 129         .name           = "ESAFEOUT"#_num,                      \
 130         .id             = MAX77693_ESAFEOUT##_num,              \
 131         .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
 132         .regulators_node        = of_match_ptr("regulators"),   \
 133         .n_voltages     = 4,                                    \
 134         .ops            = &max77693_safeout_ops,                \
 135         .type           = REGULATOR_VOLTAGE,                    \
 136         .owner          = THIS_MODULE,                          \
 137         .volt_table     = max77693_safeout_table,               \
 138         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 139         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 140         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 141         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 142 }
 143
 144 static const struct regulator_desc regulators[] = {
 145         regulator_desc_esafeout(1),
 146         regulator_desc_esafeout(2),
 147         {
 148                 .name = "CHARGER",
 149                 .id = MAX77693_CHARGER,
 150                 .of_match = of_match_ptr("CHARGER"),
 151                 .regulators_node = of_match_ptr("regulators"),
 152                 .ops = &max77693_charger_ops,
 153                 .type = REGULATOR_CURRENT,
 154                 .owner = THIS_MODULE,
 155                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 156                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 157                                 CHG_CNFG_00_BUCK_MASK,
 158         },
 159 };
 160
 161 static int max77693_pmic_probe(struct platform_device *pdev)
 162 {
 163         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 164         int i;
 165         struct regulator_config config = { };
 166
 167         config.dev = iodev->dev;
 168         config.regmap = iodev->regmap;
 169
 170         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 171                 struct regulator_dev *rdev;
 172
 173                 rdev = devm_regulator_register(&pdev->dev,
 174                                                 &regulators[i], &config);
 175                 if (IS_ERR(rdev)) {
 176                         dev_err(&pdev->dev,
 177                                 "Failed to initialize regulator-%d\n", i);
 178                         return PTR_ERR(rdev);
 179                 }
 180         }
 181
 182         return 0;
 183 }
 184
 185 static const struct platform_device_id max77693_pmic_id[] = {
 186         {"max77693-pmic", 0},
 187         {},
 188 };
 189
 190 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 191
 192 static struct platform_driver max77693_pmic_driver = {
 193         .driver = {
 194                    .name = "max77693-pmic",
 195                    },
 196         .probe = max77693_pmic_probe,
 197         .id_table = max77693_pmic_id,
 198 };
 199
 200 module_platform_driver(max77693_pmic_driver);
 201
 202 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 203 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 204 MODULE_LICENSE("GPL");