regulator: palma: Disable smps10 boost during suspend
[linux-2.6.git] / 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/delay.h>
26 #include <linux/slab.h>
27
28 #define ISL6271A_VOLTAGE_MIN    850000
29 #define ISL6271A_VOLTAGE_MAX    1600000
30 #define ISL6271A_VOLTAGE_STEP   50000
31
32 /* PMIC details */
33 struct isl_pmic {
34         struct i2c_client       *client;
35         struct regulator_dev    *rdev[3];
36         struct mutex            mtx;
37 };
38
39 static int isl6271a_get_voltage(struct regulator_dev *dev)
40 {
41         struct isl_pmic *pmic = rdev_get_drvdata(dev);
42         int idx, data;
43
44         mutex_lock(&pmic->mtx);
45
46         idx = i2c_smbus_read_byte(pmic->client);
47         if (idx < 0) {
48                 dev_err(&pmic->client->dev, "Error getting voltage\n");
49                 data = idx;
50                 goto out;
51         }
52
53         /* Convert the data from chip to microvolts */
54         data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));
55
56 out:
57         mutex_unlock(&pmic->mtx);
58         return data;
59 }
60
61 static int isl6271a_set_voltage(struct regulator_dev *dev,
62                                 int minuV, int maxuV,
63                                 unsigned *selector)
64 {
65         struct isl_pmic *pmic = rdev_get_drvdata(dev);
66         int err, data;
67
68         if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)
69                 return -EINVAL;
70         if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)
71                 return -EINVAL;
72
73         data = DIV_ROUND_UP(minuV - ISL6271A_VOLTAGE_MIN,
74                             ISL6271A_VOLTAGE_STEP);
75         *selector = data;
76
77         mutex_lock(&pmic->mtx);
78
79         err = i2c_smbus_write_byte(pmic->client, data);
80         if (err < 0)
81                 dev_err(&pmic->client->dev, "Error setting voltage\n");
82
83         mutex_unlock(&pmic->mtx);
84         return err;
85 }
86
87 static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
88 {
89         return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
90 }
91
92 static struct regulator_ops isl_core_ops = {
93         .get_voltage    = isl6271a_get_voltage,
94         .set_voltage    = isl6271a_set_voltage,
95         .list_voltage   = isl6271a_list_voltage,
96 };
97
98 static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
99 {
100         int id = rdev_get_id(dev);
101         return (id == 1) ? 1100000 : 1300000;
102 }
103
104 static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
105 {
106         int id = rdev_get_id(dev);
107         return (id == 1) ? 1100000 : 1300000;
108 }
109
110 static struct regulator_ops isl_fixed_ops = {
111         .get_voltage    = isl6271a_get_fixed_voltage,
112         .list_voltage   = isl6271a_list_fixed_voltage,
113 };
114
115 static struct regulator_desc isl_rd[] = {
116         {
117                 .name           = "Core Buck",
118                 .id             = 0,
119                 .n_voltages     = 16,
120                 .ops            = &isl_core_ops,
121                 .type           = REGULATOR_VOLTAGE,
122                 .owner          = THIS_MODULE,
123         }, {
124                 .name           = "LDO1",
125                 .id             = 1,
126                 .n_voltages     = 1,
127                 .ops            = &isl_fixed_ops,
128                 .type           = REGULATOR_VOLTAGE,
129                 .owner          = THIS_MODULE,
130         }, {
131                 .name           = "LDO2",
132                 .id             = 2,
133                 .n_voltages     = 1,
134                 .ops            = &isl_fixed_ops,
135                 .type           = REGULATOR_VOLTAGE,
136                 .owner          = THIS_MODULE,
137         },
138 };
139
140 static int __devinit isl6271a_probe(struct i2c_client *i2c,
141                                      const struct i2c_device_id *id)
142 {
143         struct regulator_init_data *init_data   = i2c->dev.platform_data;
144         struct isl_pmic *pmic;
145         int err, i;
146
147         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
148                 return -EIO;
149
150         if (!init_data) {
151                 dev_err(&i2c->dev, "no platform data supplied\n");
152                 return -EIO;
153         }
154
155         pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
156         if (!pmic)
157                 return -ENOMEM;
158
159         pmic->client = i2c;
160
161         mutex_init(&pmic->mtx);
162
163         for (i = 0; i < 3; i++) {
164                 pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev,
165                                                 init_data, pmic, NULL);
166                 if (IS_ERR(pmic->rdev[i])) {
167                         dev_err(&i2c->dev, "failed to register %s\n", id->name);
168                         err = PTR_ERR(pmic->rdev[i]);
169                         goto error;
170                 }
171         }
172
173         i2c_set_clientdata(i2c, pmic);
174
175         return 0;
176
177 error:
178         while (--i >= 0)
179                 regulator_unregister(pmic->rdev[i]);
180
181         kfree(pmic);
182         return err;
183 }
184
185 static int __devexit isl6271a_remove(struct i2c_client *i2c)
186 {
187         struct isl_pmic *pmic = i2c_get_clientdata(i2c);
188         int i;
189
190         for (i = 0; i < 3; i++)
191                 regulator_unregister(pmic->rdev[i]);
192
193         kfree(pmic);
194
195         return 0;
196 }
197
198 static const struct i2c_device_id isl6271a_id[] = {
199         {.name = "isl6271a", 0 },
200         { },
201 };
202
203 MODULE_DEVICE_TABLE(i2c, isl6271a_id);
204
205 static struct i2c_driver isl6271a_i2c_driver = {
206         .driver = {
207                 .name = "isl6271a",
208                 .owner = THIS_MODULE,
209         },
210         .probe = isl6271a_probe,
211         .remove = __devexit_p(isl6271a_remove),
212         .id_table = isl6271a_id,
213 };
214
215 static int __init isl6271a_init(void)
216 {
217         return i2c_add_driver(&isl6271a_i2c_driver);
218 }
219
220 static void __exit isl6271a_cleanup(void)
221 {
222         i2c_del_driver(&isl6271a_i2c_driver);
223 }
224
225 subsys_initcall(isl6271a_init);
226 module_exit(isl6271a_cleanup);
227
228 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
229 MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
230 MODULE_LICENSE("GPL v2");