4 * Support for Intersil ISL6271A voltage regulator
6 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13 * whether express or implied; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/err.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/i2c.h>
25 #include <linux/slab.h>
27 #define ISL6271A_VOLTAGE_MIN 850000
28 #define ISL6271A_VOLTAGE_MAX 1600000
29 #define ISL6271A_VOLTAGE_STEP 50000
33 struct i2c_client *client;
34 struct regulator_dev *rdev[3];
38 static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
40 struct isl_pmic *pmic = rdev_get_drvdata(dev);
43 mutex_lock(&pmic->mtx);
45 idx = i2c_smbus_read_byte(pmic->client);
47 dev_err(&pmic->client->dev, "Error getting voltage\n");
49 mutex_unlock(&pmic->mtx);
53 static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
56 struct isl_pmic *pmic = rdev_get_drvdata(dev);
59 mutex_lock(&pmic->mtx);
61 err = i2c_smbus_write_byte(pmic->client, selector);
63 dev_err(&pmic->client->dev, "Error setting voltage\n");
65 mutex_unlock(&pmic->mtx);
69 static struct regulator_ops isl_core_ops = {
70 .get_voltage_sel = isl6271a_get_voltage_sel,
71 .set_voltage_sel = isl6271a_set_voltage_sel,
72 .list_voltage = regulator_list_voltage_linear,
73 .map_voltage = regulator_map_voltage_linear,
76 static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
78 int id = rdev_get_id(dev);
79 return (id == 1) ? 1100000 : 1300000;
82 static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
84 int id = rdev_get_id(dev);
85 return (id == 1) ? 1100000 : 1300000;
88 static struct regulator_ops isl_fixed_ops = {
89 .get_voltage = isl6271a_get_fixed_voltage,
90 .list_voltage = isl6271a_list_fixed_voltage,
93 static const struct regulator_desc isl_rd[] = {
99 .type = REGULATOR_VOLTAGE,
100 .owner = THIS_MODULE,
101 .min_uV = ISL6271A_VOLTAGE_MIN,
102 .uV_step = ISL6271A_VOLTAGE_STEP,
107 .ops = &isl_fixed_ops,
108 .type = REGULATOR_VOLTAGE,
109 .owner = THIS_MODULE,
114 .ops = &isl_fixed_ops,
115 .type = REGULATOR_VOLTAGE,
116 .owner = THIS_MODULE,
120 static int __devinit isl6271a_probe(struct i2c_client *i2c,
121 const struct i2c_device_id *id)
123 struct regulator_config config = { };
124 struct regulator_init_data *init_data = i2c->dev.platform_data;
125 struct isl_pmic *pmic;
128 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
131 pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
137 mutex_init(&pmic->mtx);
139 for (i = 0; i < 3; i++) {
140 config.dev = &i2c->dev;
142 config.init_data = init_data;
144 config.init_data = 0;
145 config.driver_data = pmic;
147 pmic->rdev[i] = regulator_register(&isl_rd[i], &config);
148 if (IS_ERR(pmic->rdev[i])) {
149 dev_err(&i2c->dev, "failed to register %s\n", id->name);
150 err = PTR_ERR(pmic->rdev[i]);
155 i2c_set_clientdata(i2c, pmic);
161 regulator_unregister(pmic->rdev[i]);
165 static int __devexit isl6271a_remove(struct i2c_client *i2c)
167 struct isl_pmic *pmic = i2c_get_clientdata(i2c);
170 for (i = 0; i < 3; i++)
171 regulator_unregister(pmic->rdev[i]);
175 static const struct i2c_device_id isl6271a_id[] = {
176 {.name = "isl6271a", 0 },
180 MODULE_DEVICE_TABLE(i2c, isl6271a_id);
182 static struct i2c_driver isl6271a_i2c_driver = {
185 .owner = THIS_MODULE,
187 .probe = isl6271a_probe,
188 .remove = __devexit_p(isl6271a_remove),
189 .id_table = isl6271a_id,
192 static int __init isl6271a_init(void)
194 return i2c_add_driver(&isl6271a_i2c_driver);
197 static void __exit isl6271a_cleanup(void)
199 i2c_del_driver(&isl6271a_i2c_driver);
202 subsys_initcall(isl6271a_init);
203 module_exit(isl6271a_cleanup);
205 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
206 MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
207 MODULE_LICENSE("GPL v2");