[deliverable/linux.git] / include / media / v4l2-i2c-drv-legacy.h

/*
 * v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical
 *		    for all V4L2 I2C drivers. Use this header if the
 *		    I2C driver is used by both legacy drivers and
 *		    drivers converted to the bus-based I2C API.
 *
 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

struct v4l2_i2c_driver_data {
	const char * const name;
	int driverid;
	int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
	int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
	int (*remove)(struct i2c_client *client);
	int (*suspend)(struct i2c_client *client, pm_message_t state);
	int (*resume)(struct i2c_client *client);
	int (*legacy_probe)(struct i2c_adapter *adapter);
	int legacy_class;
	const struct i2c_device_id *id_table;
};

static struct v4l2_i2c_driver_data v4l2_i2c_data;
static const struct i2c_client_address_data addr_data;
static struct i2c_driver v4l2_i2c_driver_legacy;
static char v4l2_i2c_drv_name_legacy[32];

static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind)
{
	return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy,
			v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe);
}

static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter)
{
	if (v4l2_i2c_data.legacy_probe) {
		if (v4l2_i2c_data.legacy_probe(adapter))
			return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
		return 0;
	}
	if (adapter->class & v4l2_i2c_data.legacy_class)
		return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
	return 0;
}

static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client)
{
	int err;

	if (v4l2_i2c_data.remove)
		v4l2_i2c_data.remove(client);

	err = i2c_detach_client(client);
	if (err)
		return err;
	kfree(client);

	return 0;
}

static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state)
{
	return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0;
}

static int v4l2_i2c_drv_resume_helper(struct i2c_client *client)
{
	return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0;
}

/* ----------------------------------------------------------------------- */

/* i2c implementation */
static struct i2c_driver v4l2_i2c_driver_legacy = {
	.driver = {
		.owner = THIS_MODULE,
	},
	.attach_adapter = v4l2_i2c_drv_probe_legacy,
	.detach_client = v4l2_i2c_drv_detach_legacy,
	.suspend = v4l2_i2c_drv_suspend_helper,
	.resume  = v4l2_i2c_drv_resume_helper,
};

/* ----------------------------------------------------------------------- */

/* i2c implementation */
static struct i2c_driver v4l2_i2c_driver = {
	.suspend 	= v4l2_i2c_drv_suspend_helper,
	.resume  	= v4l2_i2c_drv_resume_helper,
};

static int __init v4l2_i2c_drv_init(void)
{
	int err;

	strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy));
	strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy));

	if (v4l2_i2c_data.legacy_class == 0)
		v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG;

	v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy;
	v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid;
	v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command;
	err = i2c_add_driver(&v4l2_i2c_driver_legacy);

	if (err)
		return err;
	v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
	v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
	v4l2_i2c_driver.command = v4l2_i2c_data.command;
	v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
	v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
	v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table;
	err = i2c_add_driver(&v4l2_i2c_driver);
	if (err)
		i2c_del_driver(&v4l2_i2c_driver_legacy);
	return err;
}

static void __exit v4l2_i2c_drv_cleanup(void)
{
	i2c_del_driver(&v4l2_i2c_driver_legacy);
	i2c_del_driver(&v4l2_i2c_driver);
}

module_init(v4l2_i2c_drv_init);
module_exit(v4l2_i2c_drv_cleanup);
Commit	Line	Data
8ffbc655 HV	1	/*
	2	* v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical
	3	* for all V4L2 I2C drivers. Use this header if the
	4	* I2C driver is used by both legacy drivers and
	5	* drivers converted to the bus-based I2C API.
	6	*
	7	* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	struct v4l2_i2c_driver_data {
	25	const char * const name;
	26	int driverid;
	27	int (command)(struct i2c_client client, unsigned int cmd, void *arg);
d2653e92	28	int (probe)(struct i2c_client client, const struct i2c_device_id *id);
8ffbc655 HV	29	int (remove)(struct i2c_client client);
	30	int (suspend)(struct i2c_client client, pm_message_t state);
	31	int (resume)(struct i2c_client client);
88307eb3	32	int (legacy_probe)(struct i2c_adapter adapter);
8ffbc655	33	int legacy_class;
ae429083	34	const struct i2c_device_id *id_table;
8ffbc655 HV	35	};
	36
	37	static struct v4l2_i2c_driver_data v4l2_i2c_data;
bfb6df24	38	static const struct i2c_client_address_data addr_data;
8ffbc655 HV	39	static struct i2c_driver v4l2_i2c_driver_legacy;
	40	static char v4l2_i2c_drv_name_legacy[32];
	41
	42	static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind)
	43	{
	44	return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy,
	45	v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe);
	46	}
	47
	48	static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter)
	49	{
88307eb3 HV	50	if (v4l2_i2c_data.legacy_probe) {
	51	if (v4l2_i2c_data.legacy_probe(adapter))
	52	return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
	53	return 0;
	54	}
8ffbc655 HV	55	if (adapter->class & v4l2_i2c_data.legacy_class)
	56	return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
	57	return 0;
	58	}
	59
	60	static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client)
	61	{
a2e521e8	62	int err;
8ffbc655	63
8ffbc655 HV	64	if (v4l2_i2c_data.remove)
8ffbc655 HV	65	v4l2_i2c_data.remove(client);
a2e521e8 HV	66
	67	err = i2c_detach_client(client);
	68	if (err)
	69	return err;
8ffbc655 HV	70	kfree(client);
	71
	72	return 0;
	73	}
	74
	75	static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state)
	76	{
	77	return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0;
	78	}
	79
	80	static int v4l2_i2c_drv_resume_helper(struct i2c_client *client)
	81	{
	82	return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0;
	83	}
	84
	85	/* ----------------------------------------------------------------------- */
	86
	87	/* i2c implementation */
	88	static struct i2c_driver v4l2_i2c_driver_legacy = {
	89	.driver = {
	90	.owner = THIS_MODULE,
	91	},
	92	.attach_adapter = v4l2_i2c_drv_probe_legacy,
	93	.detach_client = v4l2_i2c_drv_detach_legacy,
	94	.suspend = v4l2_i2c_drv_suspend_helper,
	95	.resume = v4l2_i2c_drv_resume_helper,
	96	};
	97
	98	/* ----------------------------------------------------------------------- */
	99
	100	/* i2c implementation */
	101	static struct i2c_driver v4l2_i2c_driver = {
	102	.suspend = v4l2_i2c_drv_suspend_helper,
	103	.resume = v4l2_i2c_drv_resume_helper,
	104	};
	105
	106	static int __init v4l2_i2c_drv_init(void)
	107	{
	108	int err;
	109
	110	strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy));
	111	strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy));
	112
	113	if (v4l2_i2c_data.legacy_class == 0)
	114	v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG;
	115
	116	v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy;
	117	v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid;
	118	v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command;
	119	err = i2c_add_driver(&v4l2_i2c_driver_legacy);
	120
	121	if (err)
	122	return err;
	123	v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
	124	v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
	125	v4l2_i2c_driver.command = v4l2_i2c_data.command;
	126	v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
	127	v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
ae429083	128	v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table;
8ffbc655 HV	129	err = i2c_add_driver(&v4l2_i2c_driver);
	130	if (err)
	131	i2c_del_driver(&v4l2_i2c_driver_legacy);
	132	return err;
	133	}
	134
	135	static void __exit v4l2_i2c_drv_cleanup(void)
	136	{
	137	i2c_del_driver(&v4l2_i2c_driver_legacy);
	138	i2c_del_driver(&v4l2_i2c_driver);
	139	}
	140
	141	module_init(v4l2_i2c_drv_init);
	142	module_exit(v4l2_i2c_drv_cleanup);