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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 /* 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");
205 

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