Root/drivers/regulator/isl6271a-regulator.c

1/*
2 * isl6271a-regulator.c
3 *
4 * Support for Intersil ISL6271A voltage regulator
5 *
6 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
7 *
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.
11 *
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.
16 */
17
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>
26
27#define ISL6271A_VOLTAGE_MIN 850000
28#define ISL6271A_VOLTAGE_MAX 1600000
29#define ISL6271A_VOLTAGE_STEP 50000
30
31/* PMIC details */
32struct isl_pmic {
33    struct i2c_client *client;
34    struct regulator_dev *rdev[3];
35    struct mutex mtx;
36};
37
38static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
39{
40    struct isl_pmic *pmic = rdev_get_drvdata(dev);
41    int idx;
42
43    mutex_lock(&pmic->mtx);
44
45    idx = i2c_smbus_read_byte(pmic->client);
46    if (idx < 0)
47        dev_err(&pmic->client->dev, "Error getting voltage\n");
48
49    mutex_unlock(&pmic->mtx);
50    return idx;
51}
52
53static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
54                    unsigned selector)
55{
56    struct isl_pmic *pmic = rdev_get_drvdata(dev);
57    int err;
58
59    mutex_lock(&pmic->mtx);
60
61    err = i2c_smbus_write_byte(pmic->client, selector);
62    if (err < 0)
63        dev_err(&pmic->client->dev, "Error setting voltage\n");
64
65    mutex_unlock(&pmic->mtx);
66    return err;
67}
68
69static 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,
74};
75
76static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
77{
78    return dev->desc->min_uV;
79}
80
81static struct regulator_ops isl_fixed_ops = {
82    .get_voltage = isl6271a_get_fixed_voltage,
83    .list_voltage = regulator_list_voltage_linear,
84};
85
86static const struct regulator_desc isl_rd[] = {
87    {
88        .name = "Core Buck",
89        .id = 0,
90        .n_voltages = 16,
91        .ops = &isl_core_ops,
92        .type = REGULATOR_VOLTAGE,
93        .owner = THIS_MODULE,
94        .min_uV = ISL6271A_VOLTAGE_MIN,
95        .uV_step = ISL6271A_VOLTAGE_STEP,
96    }, {
97        .name = "LDO1",
98        .id = 1,
99        .n_voltages = 1,
100        .ops = &isl_fixed_ops,
101        .type = REGULATOR_VOLTAGE,
102        .owner = THIS_MODULE,
103        .min_uV = 1100000,
104    }, {
105        .name = "LDO2",
106        .id = 2,
107        .n_voltages = 1,
108        .ops = &isl_fixed_ops,
109        .type = REGULATOR_VOLTAGE,
110        .owner = THIS_MODULE,
111        .min_uV = 1300000,
112    },
113};
114
115static int __devinit isl6271a_probe(struct i2c_client *i2c,
116                     const struct i2c_device_id *id)
117{
118    struct regulator_config config = { };
119    struct regulator_init_data *init_data = i2c->dev.platform_data;
120    struct isl_pmic *pmic;
121    int err, i;
122
123    if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
124        return -EIO;
125
126    pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
127    if (!pmic)
128        return -ENOMEM;
129
130    pmic->client = i2c;
131
132    mutex_init(&pmic->mtx);
133
134    for (i = 0; i < 3; i++) {
135        config.dev = &i2c->dev;
136        if (i == 0)
137            config.init_data = init_data;
138        else
139            config.init_data = 0;
140        config.driver_data = pmic;
141
142        pmic->rdev[i] = regulator_register(&isl_rd[i], &config);
143        if (IS_ERR(pmic->rdev[i])) {
144            dev_err(&i2c->dev, "failed to register %s\n", id->name);
145            err = PTR_ERR(pmic->rdev[i]);
146            goto error;
147        }
148    }
149
150    i2c_set_clientdata(i2c, pmic);
151
152    return 0;
153
154error:
155    while (--i >= 0)
156        regulator_unregister(pmic->rdev[i]);
157    return err;
158}
159
160static int __devexit isl6271a_remove(struct i2c_client *i2c)
161{
162    struct isl_pmic *pmic = i2c_get_clientdata(i2c);
163    int i;
164
165    for (i = 0; i < 3; i++)
166        regulator_unregister(pmic->rdev[i]);
167    return 0;
168}
169
170static const struct i2c_device_id isl6271a_id[] = {
171    {.name = "isl6271a", 0 },
172    { },
173};
174
175MODULE_DEVICE_TABLE(i2c, isl6271a_id);
176
177static struct i2c_driver isl6271a_i2c_driver = {
178    .driver = {
179        .name = "isl6271a",
180        .owner = THIS_MODULE,
181    },
182    .probe = isl6271a_probe,
183    .remove = __devexit_p(isl6271a_remove),
184    .id_table = isl6271a_id,
185};
186
187static int __init isl6271a_init(void)
188{
189    return i2c_add_driver(&isl6271a_i2c_driver);
190}
191
192static void __exit isl6271a_cleanup(void)
193{
194    i2c_del_driver(&isl6271a_i2c_driver);
195}
196
197subsys_initcall(isl6271a_init);
198module_exit(isl6271a_cleanup);
199
200MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
201MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
202MODULE_LICENSE("GPL v2");
203

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