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/init.h>
19#include <linux/module.h>
20#include <linux/i2c.h>
21#include <linux/videodev2.h>
22#include <media/v4l2-device.h>
23#include <linux/slab.h>
24
25MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
26MODULE_LICENSE("GPL v2");
27
28static const u8 initial_registers[] = {
29	0x12, 0x80,
30	0x12, 0x54,
31	0x14, 0x24,
32	0x15, 0x01,
33	0x28, 0x20,
34	0x75, 0x82,
35	0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
36};
37
38static int write_regs(struct i2c_client *client, const u8 *regs)
39{
40	int i;
41
42	for (i = 0; regs[i] != 0xFF; i += 2)
43		if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
44			return -1;
45	return 0;
46}
47
48/* ----------------------------------------------------------------------- */
49
50static const struct v4l2_subdev_ops ov7640_ops;
51
52static int ov7640_probe(struct i2c_client *client,
53			const struct i2c_device_id *id)
54{
55	struct i2c_adapter *adapter = client->adapter;
56	struct v4l2_subdev *sd;
57
58	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
59		return -ENODEV;
60
61	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
62	if (sd == NULL)
63		return -ENOMEM;
64	v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
65
66	client->flags = I2C_CLIENT_SCCB;
67
68	v4l_info(client, "chip found @ 0x%02x (%s)\n",
69			client->addr << 1, client->adapter->name);
70
71	if (write_regs(client, initial_registers) < 0) {
72		v4l_err(client, "error initializing OV7640\n");
73		return -ENODEV;
74	}
75
76	return 0;
77}
78
79
80static int ov7640_remove(struct i2c_client *client)
81{
82	struct v4l2_subdev *sd = i2c_get_clientdata(client);
83
84	v4l2_device_unregister_subdev(sd);
85
86	return 0;
87}
88
89static const struct i2c_device_id ov7640_id[] = {
90	{ "ov7640", 0 },
91	{ }
92};
93MODULE_DEVICE_TABLE(i2c, ov7640_id);
94
95static struct i2c_driver ov7640_driver = {
96	.driver = {
97		.owner	= THIS_MODULE,
98		.name	= "ov7640",
99	},
100	.probe = ov7640_probe,
101	.remove = ov7640_remove,
102	.id_table = ov7640_id,
103};
104module_i2c_driver(ov7640_driver);
105