Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
[linux-2.6] / drivers / staging / go7007 / wis-ov7640.c
1 /*
2  * Copyright (C) 2005-2006 Micronas USA Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License (Version 2) as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software Foundation,
15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16  */
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/videodev2.h>
22
23 #include "wis-i2c.h"
24
25 struct wis_ov7640 {
26         int brightness;
27         int contrast;
28         int saturation;
29         int hue;
30 };
31
32 static u8 initial_registers[] =
33 {
34         0x12, 0x80,
35         0x12, 0x54,
36         0x14, 0x24,
37         0x15, 0x01,
38         0x28, 0x20,
39         0x75, 0x82,
40         0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
41 };
42
43 static int write_regs(struct i2c_client *client, u8 *regs)
44 {
45         int i;
46
47         for (i = 0; regs[i] != 0xFF; i += 2)
48                 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
49                         return -1;
50         return 0;
51 }
52
53 static struct i2c_driver wis_ov7640_driver;
54
55 static struct i2c_client wis_ov7640_client_templ = {
56         .name           = "OV7640 (WIS)",
57         .driver         = &wis_ov7640_driver,
58 };
59
60 static int wis_ov7640_detect(struct i2c_adapter *adapter, int addr, int kind)
61 {
62         struct i2c_client *client;
63
64         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
65                 return 0;
66
67         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
68         if (client == NULL)
69                 return -ENOMEM;
70         memcpy(client, &wis_ov7640_client_templ,
71                         sizeof(wis_ov7640_client_templ));
72         client->adapter = adapter;
73         client->addr = addr;
74         client->flags = I2C_CLIENT_SCCB;
75
76         printk(KERN_DEBUG
77                 "wis-ov7640: initializing OV7640 at address %d on %s\n",
78                 addr, adapter->name);
79
80         if (write_regs(client, initial_registers) < 0) {
81                 printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
82                 kfree(client);
83                 return 0;
84         }
85
86         i2c_attach_client(client);
87         return 0;
88 }
89
90 static int wis_ov7640_detach(struct i2c_client *client)
91 {
92         int r;
93
94         r = i2c_detach_client(client);
95         if (r < 0)
96                 return r;
97
98         kfree(client);
99         return 0;
100 }
101
102 static struct i2c_driver wis_ov7640_driver = {
103         .driver = {
104                 .name   = "WIS OV7640 I2C driver",
105         },
106         .id             = I2C_DRIVERID_WIS_OV7640,
107         .detach_client  = wis_ov7640_detach,
108 };
109
110 static int __init wis_ov7640_init(void)
111 {
112         int r;
113
114         r = i2c_add_driver(&wis_ov7640_driver);
115         if (r < 0)
116                 return r;
117         return wis_i2c_add_driver(wis_ov7640_driver.id, wis_ov7640_detect);
118 }
119
120 static void __exit wis_ov7640_cleanup(void)
121 {
122         wis_i2c_del_driver(wis_ov7640_detect);
123         i2c_del_driver(&wis_ov7640_driver);
124 }
125
126 module_init(wis_ov7640_init);
127 module_exit(wis_ov7640_cleanup);
128
129 MODULE_LICENSE("GPL v2");