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, rv->reg, 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(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
51		return -ENODEV;
52
53	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
54	if (sd == NULL)
55		return -ENOMEM;
56	v4l2_i2c_subdev_init(sd, client, &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, 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