[mirror_ubuntu-zesty-kernel.git] / drivers / media / i2c / ov7640.c

/*
 * 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 = {
		.name	= "ov7640",
	},
	.probe = ov7640_probe,
	.remove = ov7640_remove,
	.id_table = ov7640_id,
};
module_i2c_driver(ov7640_driver);
Commit	Line	Data
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.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software Foundation,
	15	* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	16	*/
	17
	18	#include <linux/init.h>
	19	#include <linux/module.h>
	20	#include <linux/i2c.h>
	21	#include <linux/videodev2.h>
	22	#include <media/v4l2-device.h>
ec367c3c HV	23	#include <linux/slab.h>
	24
	25	MODULE_DESCRIPTION("OmniVision ov7640 sensor driver");
	26	MODULE_LICENSE("GPL v2");
	27
	28	static const u8 initial_registers[] = {
	29	0x12, 0x80,
	30	0x12, 0x54,
	31	0x14, 0x24,
	32	0x15, 0x01,
	33	0x28, 0x20,
	34	0x75, 0x82,
	35	0xFF, 0xFF, /* Terminator (reg 0xFF is unused) */
	36	};
	37
	38	static int write_regs(struct i2c_client client, const u8 regs)
	39	{
	40	int i;
	41
	42	for (i = 0; regs[i] != 0xFF; i += 2)
	43	if (i2c_smbus_write_byte_data(client, regs[i], regs[i + 1]) < 0)
	44	return -1;
	45	return 0;
	46	}
	47
	48	/* ----------------------------------------------------------------------- */
	49
	50	static const struct v4l2_subdev_ops ov7640_ops;
	51
	52	static int ov7640_probe(struct i2c_client *client,
	53	const struct i2c_device_id *id)
	54	{
	55	struct i2c_adapter *adapter = client->adapter;
	56	struct v4l2_subdev *sd;
	57
	58	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	59	return -ENODEV;
	60
c02b211d	61	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
ec367c3c HV	62	if (sd == NULL)
	63	return -ENOMEM;
	64	v4l2_i2c_subdev_init(sd, client, &ov7640_ops);
	65
	66	client->flags = I2C_CLIENT_SCCB;
	67
	68	v4l_info(client, "chip found @ 0x%02x (%s)\n",
	69	client->addr << 1, client->adapter->name);
	70
	71	if (write_regs(client, initial_registers) < 0) {
	72	v4l_err(client, "error initializing OV7640\n");
ec367c3c HV	73	return -ENODEV;
	74	}
	75
	76	return 0;
	77	}
	78
	79
	80	static int ov7640_remove(struct i2c_client *client)
	81	{
	82	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	83
	84	v4l2_device_unregister_subdev(sd);
c02b211d	85
ec367c3c HV	86	return 0;
	87	}
	88
	89	static const struct i2c_device_id ov7640_id[] = {
	90	{ "ov7640", 0 },
	91	{ }
	92	};
	93	MODULE_DEVICE_TABLE(i2c, ov7640_id);
	94
	95	static struct i2c_driver ov7640_driver = {
	96	.driver = {
ec367c3c HV	97	.name = "ov7640",
	98	},
	99	.probe = ov7640_probe,
	100	.remove = ov7640_remove,
	101	.id_table = ov7640_id,
	102	};
	103	module_i2c_driver(ov7640_driver);