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>
23 static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
24 int bytes, void *dest)
28 ret = i2c_master_send(wm8350->i2c_client, ®, 1);
31 ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
39 static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
42 /* we add 1 byte for device register */
43 u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
46 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
50 memcpy(&msg[1], src, bytes);
51 ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
59 static int wm8350_i2c_probe(struct i2c_client *i2c,
60 const struct i2c_device_id *id)
62 struct wm8350 *wm8350;
65 wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
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;
77 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
88 static int wm8350_i2c_remove(struct i2c_client *i2c)
90 struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
92 wm8350_device_exit(wm8350);
98 static const struct i2c_device_id wm8350_i2c_id[] = {
104 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
107 static struct i2c_driver wm8350_i2c_driver = {
110 .owner = THIS_MODULE,
112 .probe = wm8350_i2c_probe,
113 .remove = wm8350_i2c_remove,
114 .id_table = wm8350_i2c_id,
117 static int __init wm8350_i2c_init(void)
119 return i2c_add_driver(&wm8350_i2c_driver);
121 /* init early so consumer devices can complete system boot */
122 subsys_initcall(wm8350_i2c_init);
124 static void __exit wm8350_i2c_exit(void)
126 i2c_del_driver(&wm8350_i2c_driver);
128 module_exit(wm8350_i2c_exit);
130 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
131 MODULE_LICENSE("GPL");