GNU Linux-libre 5.10.219-gnu1
[releases.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/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 */
32 struct isl_pmic {
33         struct i2c_client       *client;
34         struct mutex            mtx;
35 };
36
37 static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
38 {
39         struct isl_pmic *pmic = rdev_get_drvdata(dev);
40         int idx;
41
42         mutex_lock(&pmic->mtx);
43
44         idx = i2c_smbus_read_byte(pmic->client);
45         if (idx < 0)
46                 dev_err(&pmic->client->dev, "Error getting voltage\n");
47
48         mutex_unlock(&pmic->mtx);
49         return idx;
50 }
51
52 static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
53                                     unsigned selector)
54 {
55         struct isl_pmic *pmic = rdev_get_drvdata(dev);
56         int err;
57
58         mutex_lock(&pmic->mtx);
59
60         err = i2c_smbus_write_byte(pmic->client, selector);
61         if (err < 0)
62                 dev_err(&pmic->client->dev, "Error setting voltage\n");
63
64         mutex_unlock(&pmic->mtx);
65         return err;
66 }
67
68 static const struct regulator_ops isl_core_ops = {
69         .get_voltage_sel = isl6271a_get_voltage_sel,
70         .set_voltage_sel = isl6271a_set_voltage_sel,
71         .list_voltage   = regulator_list_voltage_linear,
72         .map_voltage    = regulator_map_voltage_linear,
73 };
74
75 static const struct regulator_ops isl_fixed_ops = {
76         .list_voltage   = regulator_list_voltage_linear,
77 };
78
79 static const struct regulator_desc isl_rd[] = {
80         {
81                 .name           = "Core Buck",
82                 .id             = 0,
83                 .n_voltages     = 16,
84                 .ops            = &isl_core_ops,
85                 .type           = REGULATOR_VOLTAGE,
86                 .owner          = THIS_MODULE,
87                 .min_uV         = ISL6271A_VOLTAGE_MIN,
88                 .uV_step        = ISL6271A_VOLTAGE_STEP,
89         }, {
90                 .name           = "LDO1",
91                 .id             = 1,
92                 .n_voltages     = 1,
93                 .ops            = &isl_fixed_ops,
94                 .type           = REGULATOR_VOLTAGE,
95                 .owner          = THIS_MODULE,
96                 .min_uV         = 1100000,
97         }, {
98                 .name           = "LDO2",
99                 .id             = 2,
100                 .n_voltages     = 1,
101                 .ops            = &isl_fixed_ops,
102                 .type           = REGULATOR_VOLTAGE,
103                 .owner          = THIS_MODULE,
104                 .min_uV         = 1300000,
105         },
106 };
107
108 static int isl6271a_probe(struct i2c_client *i2c,
109                                      const struct i2c_device_id *id)
110 {
111         struct regulator_dev *rdev;
112         struct regulator_config config = { };
113         struct regulator_init_data *init_data   = dev_get_platdata(&i2c->dev);
114         struct isl_pmic *pmic;
115         int i;
116
117         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
118                 return -EIO;
119
120         pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
121         if (!pmic)
122                 return -ENOMEM;
123
124         pmic->client = i2c;
125
126         mutex_init(&pmic->mtx);
127
128         for (i = 0; i < 3; i++) {
129                 config.dev = &i2c->dev;
130                 if (i == 0)
131                         config.init_data = init_data;
132                 else
133                         config.init_data = NULL;
134                 config.driver_data = pmic;
135
136                 rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
137                 if (IS_ERR(rdev)) {
138                         dev_err(&i2c->dev, "failed to register %s\n", id->name);
139                         return PTR_ERR(rdev);
140                 }
141         }
142
143         i2c_set_clientdata(i2c, pmic);
144
145         return 0;
146 }
147
148 static const struct i2c_device_id isl6271a_id[] = {
149         {.name = "isl6271a", 0 },
150         { },
151 };
152
153 MODULE_DEVICE_TABLE(i2c, isl6271a_id);
154
155 static struct i2c_driver isl6271a_i2c_driver = {
156         .driver = {
157                 .name = "isl6271a",
158         },
159         .probe = isl6271a_probe,
160         .id_table = isl6271a_id,
161 };
162
163 static int __init isl6271a_init(void)
164 {
165         return i2c_add_driver(&isl6271a_i2c_driver);
166 }
167
168 static void __exit isl6271a_cleanup(void)
169 {
170         i2c_del_driver(&isl6271a_i2c_driver);
171 }
172
173 subsys_initcall(isl6271a_init);
174 module_exit(isl6271a_cleanup);
175
176 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
177 MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
178 MODULE_LICENSE("GPL v2");