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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  */
 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");
192 

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