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
wm8350_i2c_read_device(struct wm8350 * wm8350,char reg,int bytes,void * dest)24 static 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, ®, 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
wm8350_i2c_write_device(struct wm8350 * wm8350,char reg,int bytes,void * src)40 static 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
wm8350_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)60 static 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
82 err:
83 return ret;
84 }
85
wm8350_i2c_remove(struct i2c_client * i2c)86 static 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
95 static const struct i2c_device_id wm8350_i2c_id[] = {
96 { "wm8350", 0 },
97 { "wm8351", 0 },
98 { "wm8352", 0 },
99 { }
100 };
101 MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
102
103
104 static 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
wm8350_i2c_init(void)114 static 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 */
119 subsys_initcall(wm8350_i2c_init);
120
wm8350_i2c_exit(void)121 static void __exit wm8350_i2c_exit(void)
122 {
123 i2c_del_driver(&wm8350_i2c_driver);
124 }
125 module_exit(wm8350_i2c_exit);
126
127 MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
128 MODULE_LICENSE("GPL");
129