tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Liam Girdwood
7 * linux@wolfsonmicro.com
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/init.h>
19#include <linux/i2c.h>
20#include <linux/platform_device.h>
21#include <linux/mfd/wm8350/core.h>
22
23static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
24 int bytes, void *dest)
25{
26 int ret;
27
28 ret = i2c_master_send(wm8350->i2c_client, ®, 1);
29 if (ret < 0)
30 return ret;
31 ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
32 if (ret < 0)
33 return ret;
34 if (ret != bytes)
35 return -EIO;
36 return 0;
37}
38
39static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
40 int bytes, void *src)
41{
42 /* we add 1 byte for device register */
43 u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
44 int ret;
45
46 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
47 return -EINVAL;
48
49 msg[0] = reg;
50 memcpy(&msg[1], src, bytes);
51 ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
52 if (ret < 0)
53 return ret;
54 if (ret != bytes + 1)
55 return -EIO;
56 return 0;
57}
58
59static int wm8350_i2c_probe(struct i2c_client *i2c,
60 const struct i2c_device_id *id)
61{
62 struct wm8350 *wm8350;
63 int ret = 0;
64
65 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
66 if (wm8350 == NULL) {
67 kfree(i2c);
68 return -ENOMEM;
69 }
70
71 i2c_set_clientdata(i2c, wm8350);
72 wm8350->dev = &i2c->dev;
73 wm8350->i2c_client = i2c;
74 wm8350->read_dev = wm8350_i2c_read_device;
75 wm8350->write_dev = wm8350_i2c_write_device;
76
77 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
78 if (ret < 0)
79 goto err;
80
81 return ret;
82
83err:
84 kfree(wm8350);
85 return ret;
86}
87
88static int wm8350_i2c_remove(struct i2c_client *i2c)
89{
90 struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
91
92 wm8350_device_exit(wm8350);
93 kfree(wm8350);
94
95 return 0;
96}
97
98static const struct i2c_device_id wm8350_i2c_id[] = {
99 { "wm8350", 0 },
100 { "wm8351", 0 },
101 { "wm8352", 0 },
102 { }
103};
104MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
105
106
107static struct i2c_driver wm8350_i2c_driver = {
108 .driver = {
109 .name = "wm8350",
110 .owner = THIS_MODULE,
111 },
112 .probe = wm8350_i2c_probe,
113 .remove = wm8350_i2c_remove,
114 .id_table = wm8350_i2c_id,
115};
116
117static int __init wm8350_i2c_init(void)
118{
119 return i2c_add_driver(&wm8350_i2c_driver);
120}
121/* init early so consumer devices can complete system boot */
122subsys_initcall(wm8350_i2c_init);
123
124static void __exit wm8350_i2c_exit(void)
125{
126 i2c_del_driver(&wm8350_i2c_driver);
127}
128module_exit(wm8350_i2c_exit);
129
130MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
131MODULE_LICENSE("GPL");