Merge remote-tracking branch 'asoc/fix/wm8978' into asoc-linus
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mfd / tps65912-i2c.c
1 /*
2  * tps65912-i2c.c  --  I2C access for TI TPS65912x PMIC
3  *
4  * Copyright 2011 Texas Instruments Inc.
5  *
6  * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
7  *
8  *  This program is free software; you can redistribute it and/or modify it
9  *  under  the terms of the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the License, or (at your
11  *  option) any later version.
12  *
13  *  This driver is based on wm8350 implementation.
14  */
15
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/gpio.h>
21 #include <linux/i2c.h>
22 #include <linux/mfd/core.h>
23 #include <linux/mfd/tps65912.h>
24
25 static int tps65912_i2c_read(struct tps65912 *tps65912, u8 reg,
26                                   int bytes, void *dest)
27 {
28         struct i2c_client *i2c = tps65912->control_data;
29         struct i2c_msg xfer[2];
30         int ret;
31
32         /* Write register */
33         xfer[0].addr = i2c->addr;
34         xfer[0].flags = 0;
35         xfer[0].len = 1;
36         xfer[0].buf = &reg;
37
38         /* Read data */
39         xfer[1].addr = i2c->addr;
40         xfer[1].flags = I2C_M_RD;
41         xfer[1].len = bytes;
42         xfer[1].buf = dest;
43
44         ret = i2c_transfer(i2c->adapter, xfer, 2);
45         if (ret == 2)
46                 ret = 0;
47         else if (ret >= 0)
48                 ret = -EIO;
49         return ret;
50 }
51
52 static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg,
53                                    int bytes, void *src)
54 {
55         struct i2c_client *i2c = tps65912->control_data;
56         /* we add 1 byte for device register */
57         u8 msg[TPS6591X_MAX_REGISTER + 1];
58         int ret;
59
60         if (bytes > TPS6591X_MAX_REGISTER)
61                 return -EINVAL;
62
63         msg[0] = reg;
64         memcpy(&msg[1], src, bytes);
65
66         ret = i2c_master_send(i2c, msg, bytes + 1);
67         if (ret < 0)
68                 return ret;
69         if (ret != bytes + 1)
70                 return -EIO;
71
72         return 0;
73 }
74
75 static int tps65912_i2c_probe(struct i2c_client *i2c,
76                             const struct i2c_device_id *id)
77 {
78         struct tps65912 *tps65912;
79
80         tps65912 = devm_kzalloc(&i2c->dev,
81                                 sizeof(struct tps65912), GFP_KERNEL);
82         if (tps65912 == NULL)
83                 return -ENOMEM;
84
85         i2c_set_clientdata(i2c, tps65912);
86         tps65912->dev = &i2c->dev;
87         tps65912->control_data = i2c;
88         tps65912->read = tps65912_i2c_read;
89         tps65912->write = tps65912_i2c_write;
90
91         return tps65912_device_init(tps65912);
92 }
93
94 static int tps65912_i2c_remove(struct i2c_client *i2c)
95 {
96         struct tps65912 *tps65912 = i2c_get_clientdata(i2c);
97
98         tps65912_device_exit(tps65912);
99
100         return 0;
101 }
102
103 static const struct i2c_device_id tps65912_i2c_id[] = {
104         {"tps65912", 0 },
105         { }
106 };
107 MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id);
108
109 static struct i2c_driver tps65912_i2c_driver = {
110         .driver = {
111                    .name = "tps65912",
112                    .owner = THIS_MODULE,
113         },
114         .probe = tps65912_i2c_probe,
115         .remove = tps65912_i2c_remove,
116         .id_table = tps65912_i2c_id,
117 };
118
119 static int __init tps65912_i2c_init(void)
120 {
121         int ret;
122
123         ret = i2c_add_driver(&tps65912_i2c_driver);
124         if (ret != 0)
125                 pr_err("Failed to register TPS65912 I2C driver: %d\n", ret);
126
127         return ret;
128 }
129 /* init early so consumer devices can complete system boot */
130 subsys_initcall(tps65912_i2c_init);
131
132 static void __exit tps65912_i2c_exit(void)
133 {
134         i2c_del_driver(&tps65912_i2c_driver);
135 }
136 module_exit(tps65912_i2c_exit);
137
138 MODULE_AUTHOR("Margarita Olaya  <magi@slimlogic.co.uk>");
139 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
140 MODULE_LICENSE("GPL");