ov7640.c
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/*
* Copyright (C) 2005-2006 Micronas USA Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <linux/slab.h>
MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
MODULE_LICENSE("GPL v2");
static const u8 initial_registers[] = {
0x12, 0x80,
0x12, 0x54,
0x14, 0x24,
0x15, 0x01,
0x28, 0x20,
0x75, 0x82,
0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
};
static int write_regs(struct i2c_client *client, const u8 *regs)
{
int i;
for (i = 0; regs[i] != 0xFF; i += 2)
if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
return -1;
return 0;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_subdev_ops ov7640_ops;
static int ov7640_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = client->adapter;
struct v4l2_subdev *sd;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
client->flags = I2C_CLIENT_SCCB;
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
if (write_regs(client, initial_registers) < 0) {
v4l_err(client, "error initializing OV7640\n");
return -ENODEV;
}
return 0;
}
static int ov7640_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
return 0;
}
static const struct i2c_device_id ov7640_id[] = {
{ "ov7640", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ov7640_id);
static struct i2c_driver ov7640_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ov7640",
},
.probe = ov7640_probe,
.remove = ov7640_remove,
.id_table = ov7640_id,
};
module_i2c_driver(ov7640_driver);