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1 | /* |
2 | * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC | |
3 | * | |
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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 | ||
23 | static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg, | |
24 | int bytes, void *dest) | |
25 | { | |
26 | int ret; | |
27 | ||
28 | ret = i2c_master_send(wm8350->i2c_client, ®, 1); | |
29 | if (ret < 0) | |
30 | return ret; | |
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31 | ret = i2c_master_recv(wm8350->i2c_client, dest, bytes); |
32 | if (ret < 0) | |
33 | return ret; | |
34 | if (ret != bytes) | |
35 | return -EIO; | |
36 | return 0; | |
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37 | } |
38 | ||
39 | static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg, | |
40 | int bytes, void *src) | |
41 | { | |
42 | /* we add 1 byte for device register */ | |
43 | u8 msg[(WM8350_MAX_REGISTER << 1) + 1]; | |
898d8054 | 44 | int ret; |
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45 | |
46 | if (bytes > ((WM8350_MAX_REGISTER << 1) + 1)) | |
47 | return -EINVAL; | |
48 | ||
49 | msg[0] = reg; | |
50 | memcpy(&msg[1], src, bytes); | |
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51 | ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1); |
52 | if (ret < 0) | |
53 | return ret; | |
54 | if (ret != bytes + 1) | |
55 | return -EIO; | |
56 | return 0; | |
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57 | } |
58 | ||
59 | static int wm8350_i2c_probe(struct i2c_client *i2c, | |
60 | const struct i2c_device_id *id) | |
61 | { | |
62 | struct wm8350 *wm8350; | |
63 | int ret = 0; | |
64 | ||
65 | wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL); | |
66 | if (wm8350 == NULL) { | |
67 | kfree(i2c); | |
68 | return -ENOMEM; | |
69 | } | |
70 | ||
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; | |
76 | ||
ebccec0f | 77 | ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data); |
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78 | if (ret < 0) |
79 | goto err; | |
80 | ||
81 | return ret; | |
82 | ||
83 | err: | |
84 | kfree(wm8350); | |
85 | return ret; | |
86 | } | |
87 | ||
88 | static int wm8350_i2c_remove(struct i2c_client *i2c) | |
89 | { | |
90 | struct wm8350 *wm8350 = i2c_get_clientdata(i2c); | |
91 | ||
92 | wm8350_device_exit(wm8350); | |
93 | kfree(wm8350); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static const struct i2c_device_id wm8350_i2c_id[] = { | |
99 | { "wm8350", 0 }, | |
ca23f8c1 | 100 | { "wm8351", 0 }, |
96920630 | 101 | { "wm8352", 0 }, |
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102 | { } |
103 | }; | |
104 | MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id); | |
105 | ||
106 | ||
107 | static struct i2c_driver wm8350_i2c_driver = { | |
108 | .driver = { | |
109 | .name = "wm8350", | |
110 | .owner = THIS_MODULE, | |
111 | }, | |
112 | .probe = wm8350_i2c_probe, | |
113 | .remove = wm8350_i2c_remove, | |
114 | .id_table = wm8350_i2c_id, | |
115 | }; | |
116 | ||
117 | static int __init wm8350_i2c_init(void) | |
118 | { | |
119 | return i2c_add_driver(&wm8350_i2c_driver); | |
120 | } | |
121 | /* init early so consumer devices can complete system boot */ | |
122 | subsys_initcall(wm8350_i2c_init); | |
123 | ||
124 | static void __exit wm8350_i2c_exit(void) | |
125 | { | |
126 | i2c_del_driver(&wm8350_i2c_driver); | |
127 | } | |
128 | module_exit(wm8350_i2c_exit); | |
129 | ||
130 | MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC"); | |
131 | MODULE_LICENSE("GPL"); |