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#include <linux/slab.h>
23
24static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
25				  int bytes, void *dest)
26{
27	int ret;
28
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;
38}
39
40static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
41				   int bytes, void *src)
42{
43	/* we add 1 byte for device register */
44	u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
45	int ret;
46
47	if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
48		return -EINVAL;
49
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;
58}
59
60static int wm8350_i2c_probe(struct i2c_client *i2c,
61			    const struct i2c_device_id *id)
62{
63	struct wm8350 *wm8350;
64	int ret = 0;
65
66	wm8350 = devm_kzalloc(&i2c->dev, sizeof(struct wm8350), GFP_KERNEL);
67	if (wm8350 == NULL)
68		return -ENOMEM;
69
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;
75
76	ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
77	if (ret < 0)
78		goto err;
79
80	return ret;
81
82err:
83	return ret;
84}
85
86static int wm8350_i2c_remove(struct i2c_client *i2c)
87{
88	struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
89
90	wm8350_device_exit(wm8350);
91
92	return 0;
93}
94
95static const struct i2c_device_id wm8350_i2c_id[] = {
96       { "wm8350", 0 },
97       { "wm8351", 0 },
98       { "wm8352", 0 },
99       { }
100};
101MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
102
103
104static struct i2c_driver wm8350_i2c_driver = {
105	.driver = {
106		   .name = "wm8350",
107		   .owner = THIS_MODULE,
108	},
109	.probe = wm8350_i2c_probe,
110	.remove = wm8350_i2c_remove,
111	.id_table = wm8350_i2c_id,
112};
113
114static int __init wm8350_i2c_init(void)
115{
116	return i2c_add_driver(&wm8350_i2c_driver);
117}
118/* init early so consumer devices can complete system boot */
119subsys_initcall(wm8350_i2c_init);
120
121static void __exit wm8350_i2c_exit(void)
122{
123	i2c_del_driver(&wm8350_i2c_driver);
124}
125module_exit(wm8350_i2c_exit);
126
127MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
128MODULE_LICENSE("GPL");
129