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Margarita Olaya36e52872011-06-09 14:50:00 -05001/*
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
25static 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
52static 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
Axel Lin63c8a582011-06-24 15:34:16 +080060 if (bytes > TPS6591X_MAX_REGISTER)
Margarita Olaya36e52872011-06-09 14:50:00 -050061 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
75static int tps65912_i2c_probe(struct i2c_client *i2c,
76 const struct i2c_device_id *id)
77{
78 struct tps65912 *tps65912;
79
Lee Jonesb3fff172013-05-23 16:25:02 +010080 tps65912 = devm_kzalloc(&i2c->dev,
81 sizeof(struct tps65912), GFP_KERNEL);
Margarita Olaya36e52872011-06-09 14:50:00 -050082 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
94static 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
103static const struct i2c_device_id tps65912_i2c_id[] = {
104 {"tps65912", 0 },
105 { }
106};
107MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id);
108
109static 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
119static 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 */
130subsys_initcall(tps65912_i2c_init);
131
132static void __exit tps65912_i2c_exit(void)
133{
134 i2c_del_driver(&tps65912_i2c_driver);
135}
136module_exit(tps65912_i2c_exit);
137
138MODULE_AUTHOR("Margarita Olaya <magi@slimlogic.co.uk>");
139MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
140MODULE_LICENSE("GPL");