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ec367c3c HV |
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. | |
ec367c3c HV |
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> | |
ec367c3c HV |
19 | #include <linux/slab.h> |
20 | ||
21 | MODULE_DESCRIPTION("OmniVision ov7640 sensor driver"); | |
22 | MODULE_LICENSE("GPL v2"); | |
23 | ||
24 | static 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 | ||
34 | static 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 | ||
46 | static const struct v4l2_subdev_ops ov7640_ops; | |
47 | ||
48 | static 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 | ||
c02b211d | 57 | sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
ec367c3c HV |
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"); | |
ec367c3c HV |
69 | return -ENODEV; |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | ||
76 | static int ov7640_remove(struct i2c_client *client) | |
77 | { | |
78 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
79 | ||
80 | v4l2_device_unregister_subdev(sd); | |
c02b211d | 81 | |
ec367c3c HV |
82 | return 0; |
83 | } | |
84 | ||
85 | static const struct i2c_device_id ov7640_id[] = { | |
86 | { "ov7640", 0 }, | |
87 | { } | |
88 | }; | |
89 | MODULE_DEVICE_TABLE(i2c, ov7640_id); | |
90 | ||
91 | static struct i2c_driver ov7640_driver = { | |
92 | .driver = { | |
ec367c3c HV |
93 | .name = "ov7640", |
94 | }, | |
95 | .probe = ov7640_probe, | |
96 | .remove = ov7640_remove, | |
97 | .id_table = ov7640_id, | |
98 | }; | |
99 | module_i2c_driver(ov7640_driver); |