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Mark Brownc661a0b2008-10-10 15:58:11 +01001/*
2 * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
3 *
Mark Brownc661a0b2008-10-10 15:58:11 +01004 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Mark Brownc661a0b2008-10-10 15:58:11 +010023
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;
Mark Brown898d8052008-11-12 17:34:02 +010032 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;
Mark Brownc661a0b2008-10-10 15:58:11 +010038}
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];
Mark Brown898d8052008-11-12 17:34:02 +010045 int ret;
Mark Brownc661a0b2008-10-10 15:58:11 +010046
47 if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
48 return -EINVAL;
49
50 msg[0] = reg;
51 memcpy(&msg[1], src, bytes);
Mark Brown898d8052008-11-12 17:34:02 +010052 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;
Mark Brownc661a0b2008-10-10 15:58:11 +010058}
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 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
Rabin Vincente47a3bb2010-04-21 21:06:05 +053067 if (wm8350 == NULL)
Mark Brownc661a0b2008-10-10 15:58:11 +010068 return -ENOMEM;
Mark Brownc661a0b2008-10-10 15:58:11 +010069
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
Mark Brownebccec02008-10-10 15:58:14 +010076 ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
Mark Brownc661a0b2008-10-10 15:58:11 +010077 if (ret < 0)
78 goto err;
79
80 return ret;
81
82err:
83 kfree(wm8350);
84 return ret;
85}
86
87static int wm8350_i2c_remove(struct i2c_client *i2c)
88{
89 struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
90
91 wm8350_device_exit(wm8350);
92 kfree(wm8350);
93
94 return 0;
95}
96
97static const struct i2c_device_id wm8350_i2c_id[] = {
98 { "wm8350", 0 },
Mark Brownca23f8c2008-12-18 23:12:28 +010099 { "wm8351", 0 },
Mark Brown96920632008-12-18 23:09:50 +0100100 { "wm8352", 0 },
Mark Brownc661a0b2008-10-10 15:58:11 +0100101 { }
102};
103MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
104
105
106static struct i2c_driver wm8350_i2c_driver = {
107 .driver = {
108 .name = "wm8350",
109 .owner = THIS_MODULE,
110 },
111 .probe = wm8350_i2c_probe,
112 .remove = wm8350_i2c_remove,
113 .id_table = wm8350_i2c_id,
114};
115
116static int __init wm8350_i2c_init(void)
117{
118 return i2c_add_driver(&wm8350_i2c_driver);
119}
120/* init early so consumer devices can complete system boot */
121subsys_initcall(wm8350_i2c_init);
122
123static void __exit wm8350_i2c_exit(void)
124{
125 i2c_del_driver(&wm8350_i2c_driver);
126}
127module_exit(wm8350_i2c_exit);
128
129MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
130MODULE_LICENSE("GPL");