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
write_regs(struct i2c_client * client,u8 * regs)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
wis_ov7640_probe(struct i2c_client * client,const struct i2c_device_id * id)53 static int wis_ov7640_probe(struct i2c_client *client,
54 const struct i2c_device_id *id)
55 {
56 struct i2c_adapter *adapter = client->adapter;
57
58 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
59 return -ENODEV;
60
61 client->flags = I2C_CLIENT_SCCB;
62
63 printk(KERN_DEBUG
64 "wis-ov7640: initializing OV7640 at address %d on %s\n",
65 client->addr, adapter->name);
66
67 if (write_regs(client, initial_registers) < 0) {
68 printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
69 return -ENODEV;
70 }
71
72 return 0;
73 }
74
wis_ov7640_remove(struct i2c_client * client)75 static int wis_ov7640_remove(struct i2c_client *client)
76 {
77 return 0;
78 }
79
80 static const struct i2c_device_id wis_ov7640_id[] = {
81 { "wis_ov7640", 0 },
82 { }
83 };
84 MODULE_DEVICE_TABLE(i2c, wis_ov7640_id);
85
86 static struct i2c_driver wis_ov7640_driver = {
87 .driver = {
88 .name = "WIS OV7640 I2C driver",
89 },
90 .probe = wis_ov7640_probe,
91 .remove = wis_ov7640_remove,
92 .id_table = wis_ov7640_id,
93 };
94
wis_ov7640_init(void)95 static int __init wis_ov7640_init(void)
96 {
97 return i2c_add_driver(&wis_ov7640_driver);
98 }
99
wis_ov7640_cleanup(void)100 static void __exit wis_ov7640_cleanup(void)
101 {
102 i2c_del_driver(&wis_ov7640_driver);
103 }
104
105 module_init(wis_ov7640_init);
106 module_exit(wis_ov7640_cleanup);
107
108 MODULE_LICENSE("GPL v2");
109