1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2005-2006 Micronas USA Inc.
4 */
5
6#include <linux/init.h>
7#include <linux/module.h>
8#include <linux/i2c.h>
9#include <linux/videodev2.h>
10#include <media/v4l2-device.h>
11#include <linux/slab.h>
12
13MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
14MODULE_LICENSE("GPL v2");
15
16struct reg_val {
17 u8 reg;
18 u8 val;
19};
20
21static const struct reg_val regval_init[] = {
22 {0x12, 0x80},
23 {0x12, 0x54},
24 {0x14, 0x24},
25 {0x15, 0x01},
26 {0x28, 0x20},
27 {0x75, 0x82},
28};
29
30static int write_regs(struct i2c_client *client,
31 const struct reg_val *rv, int len)
32{
33 while (--len >= 0) {
34 if (i2c_smbus_write_byte_data(client, command: rv->reg, value: rv->val) < 0)
35 return -1;
36 rv++;
37 }
38 return 0;
39}
40
41/* ----------------------------------------------------------------------- */
42
43static const struct v4l2_subdev_ops ov7640_ops;
44
45static int ov7640_probe(struct i2c_client *client)
46{
47 struct i2c_adapter *adapter = client->adapter;
48 struct v4l2_subdev *sd;
49
50 if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA))
51 return -ENODEV;
52
53 sd = devm_kzalloc(dev: &client->dev, size: sizeof(*sd), GFP_KERNEL);
54 if (sd == NULL)
55 return -ENOMEM;
56 v4l2_i2c_subdev_init(sd, client, ops: &ov7640_ops);
57
58 client->flags = I2C_CLIENT_SCCB;
59
60 v4l_info(client, "chip found @ 0x%02x (%s)\n",
61 client->addr << 1, client->adapter->name);
62
63 if (write_regs(client, rv: regval_init, ARRAY_SIZE(regval_init)) < 0) {
64 v4l_err(client, "error initializing OV7640\n");
65 return -ENODEV;
66 }
67
68 return 0;
69}
70
71
72static void ov7640_remove(struct i2c_client *client)
73{
74 struct v4l2_subdev *sd = i2c_get_clientdata(client);
75
76 v4l2_device_unregister_subdev(sd);
77}
78
79static const struct i2c_device_id ov7640_id[] = {
80 { "ov7640", 0 },
81 { }
82};
83MODULE_DEVICE_TABLE(i2c, ov7640_id);
84
85static struct i2c_driver ov7640_driver = {
86 .driver = {
87 .name = "ov7640",
88 },
89 .probe = ov7640_probe,
90 .remove = ov7640_remove,
91 .id_table = ov7640_id,
92};
93module_i2c_driver(ov7640_driver);
94

source code of linux/drivers/media/i2c/ov7640.c