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