aboutsummaryrefslogtreecommitdiff
path: root/drivers/staging/go7007/wis-ov7640.c
blob: f5f11e927af3b3bf9be168c1b50daa1bcd37b9cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright (C) 2005-2006 Micronas USA Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (Version 2) as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>

#include "wis-i2c.h"

struct wis_ov7640 {
	int brightness;
	int contrast;
	int saturation;
	int hue;
};

static u8 initial_registers[] =
{
	0x12, 0x80,
	0x12, 0x54,
	0x14, 0x24,
	0x15, 0x01,
	0x28, 0x20,
	0x75, 0x82,
	0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
};

static int write_regs(struct i2c_client *client, u8 *regs)
{
	int i;

	for (i = 0; regs[i] != 0xFF; i += 2)
		if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
			return -1;
	return 0;
}

static struct i2c_driver wis_ov7640_driver;

static struct i2c_client wis_ov7640_client_templ = {
	.name		= "OV7640 (WIS)",
	.driver		= &wis_ov7640_driver,
};

static int wis_ov7640_detect(struct i2c_adapter *adapter, int addr, int kind)
{
	struct i2c_client *client;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return 0;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (client == NULL)
		return -ENOMEM;
	memcpy(client, &wis_ov7640_client_templ,
			sizeof(wis_ov7640_client_templ));
	client->adapter = adapter;
	client->addr = addr;
	client->flags = I2C_CLIENT_SCCB;

	printk(KERN_DEBUG
		"wis-ov7640: initializing OV7640 at address %d on %s\n",
		addr, adapter->name);

	if (write_regs(client, initial_registers) < 0) {
		printk(KERN_ERR "wis-ov7640: error initializing OV7640\n");
		kfree(client);
		return 0;
	}

	i2c_attach_client(client);
	return 0;
}

static int wis_ov7640_detach(struct i2c_client *client)
{
	int r;

	r = i2c_detach_client(client);
	if (r < 0)
		return r;

	kfree(client);
	return 0;
}

static struct i2c_driver wis_ov7640_driver = {
	.driver = {
		.name	= "WIS OV7640 I2C driver",
	},
	.id		= I2C_DRIVERID_WIS_OV7640,
	.detach_client	= wis_ov7640_detach,
};

static int __init wis_ov7640_init(void)
{
	int r;

	r = i2c_add_driver(&wis_ov7640_driver);
	if (r < 0)
		return r;
	return wis_i2c_add_driver(wis_ov7640_driver.id, wis_ov7640_detect);
}

static void __exit wis_ov7640_cleanup(void)
{
	wis_i2c_del_driver(wis_ov7640_detect);
	i2c_del_driver(&wis_ov7640_driver);
}

module_init(wis_ov7640_init);
module_exit(wis_ov7640_cleanup);

MODULE_LICENSE("GPL v2");