1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2005-2006 Micronas USA Inc.
6 #include <linux/init.h>
7 #include <linux/module.h>
9 #include <linux/videodev2.h>
10 #include <media/v4l2-device.h>
11 #include <linux/slab.h>
13 MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
14 MODULE_LICENSE("GPL v2");
16 static const u8 initial_registers[] = {
23 0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
26 static int write_regs(struct i2c_client *client, const u8 *regs)
30 for (i = 0; regs[i] != 0xFF; i += 2)
31 if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
36 /* ----------------------------------------------------------------------- */
38 static const struct v4l2_subdev_ops ov7640_ops;
40 static int ov7640_probe(struct i2c_client *client,
41 const struct i2c_device_id *id)
43 struct i2c_adapter *adapter = client->adapter;
44 struct v4l2_subdev *sd;
46 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
49 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
52 v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
54 client->flags = I2C_CLIENT_SCCB;
56 v4l_info(client, "chip found @ 0x%02x (%s)\n",
57 client->addr << 1, client->adapter->name);
59 if (write_regs(client, initial_registers) < 0) {
60 v4l_err(client, "error initializing OV7640\n");
68 static int ov7640_remove(struct i2c_client *client)
70 struct v4l2_subdev *sd = i2c_get_clientdata(client);
72 v4l2_device_unregister_subdev(sd);
77 static const struct i2c_device_id ov7640_id[] = {
81 MODULE_DEVICE_TABLE(i2c, ov7640_id);
83 static struct i2c_driver ov7640_driver = {
87 .probe = ov7640_probe,
88 .remove = ov7640_remove,
89 .id_table = ov7640_id,
91 module_i2c_driver(ov7640_driver);