printk: fixup declaration of kmsg_reasons
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / wm8350-i2c.c
blob5fe5de166adb39bdafb2e7714ce046f58b6ccb3b
1 /*
2 * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood
7 * linux@wolfsonmicro.com
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.
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 #include <linux/slab.h>
24 static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
25 int bytes, void *dest)
27 int ret;
29 ret = i2c_master_send(wm8350->i2c_client, &reg, 1);
30 if (ret < 0)
31 return ret;
32 ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
33 if (ret < 0)
34 return ret;
35 if (ret != bytes)
36 return -EIO;
37 return 0;
40 static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
41 int bytes, void *src)
43 /* we add 1 byte for device register */
44 u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
45 int ret;
47 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
48 return -EINVAL;
50 msg[0] = reg;
51 memcpy(&msg[1], src, bytes);
52 ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
53 if (ret < 0)
54 return ret;
55 if (ret != bytes + 1)
56 return -EIO;
57 return 0;
60 static int wm8350_i2c_probe(struct i2c_client *i2c,
61 const struct i2c_device_id *id)
63 struct wm8350 *wm8350;
64 int ret = 0;
66 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
67 if (wm8350 == NULL)
68 return -ENOMEM;
70 i2c_set_clientdata(i2c, wm8350);
71 wm8350->dev = &i2c->dev;
72 wm8350->i2c_client = i2c;
73 wm8350->read_dev = wm8350_i2c_read_device;
74 wm8350->write_dev = wm8350_i2c_write_device;
76 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
77 if (ret < 0)
78 goto err;
80 return ret;
82 err:
83 kfree(wm8350);
84 return ret;
87 static int wm8350_i2c_remove(struct i2c_client *i2c)
89 struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
91 wm8350_device_exit(wm8350);
92 kfree(wm8350);
94 return 0;
97 static const struct i2c_device_id wm8350_i2c_id[] = {
98 { "wm8350", 0 },
99 { "wm8351", 0 },
100 { "wm8352", 0 },
103 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
106 static struct i2c_driver wm8350_i2c_driver = {
107 .driver = {
108 .name = "wm8350",
109 .owner = THIS_MODULE,
111 .probe = wm8350_i2c_probe,
112 .remove = wm8350_i2c_remove,
113 .id_table = wm8350_i2c_id,
116 static int __init wm8350_i2c_init(void)
118 return i2c_add_driver(&wm8350_i2c_driver);
120 /* init early so consumer devices can complete system boot */
121 subsys_initcall(wm8350_i2c_init);
123 static void __exit wm8350_i2c_exit(void)
125 i2c_del_driver(&wm8350_i2c_driver);
127 module_exit(wm8350_i2c_exit);
129 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
130 MODULE_LICENSE("GPL");