[mirror_ubuntu-artful-kernel.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);
	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;
};

static struct v4l2_i2c_driver_data v4l2_i2c_data;
static 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;
	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);
	28	int (probe)(struct i2c_client client);
	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 HV	33	int legacy_class;
	34	};
	35
	36	static struct v4l2_i2c_driver_data v4l2_i2c_data;
	37	static struct i2c_client_address_data addr_data;
	38	static struct i2c_driver v4l2_i2c_driver_legacy;
	39	static char v4l2_i2c_drv_name_legacy[32];
	40
	41	static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind)
	42	{
	43	return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy,
	44	v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe);
	45	}
	46
	47	static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter)
	48	{
88307eb3 HV	49	if (v4l2_i2c_data.legacy_probe) {
	50	if (v4l2_i2c_data.legacy_probe(adapter))
	51	return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
	52	return 0;
	53	}
8ffbc655 HV	54	if (adapter->class & v4l2_i2c_data.legacy_class)
	55	return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy);
	56	return 0;
	57	}
	58
	59	static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client)
	60	{
a2e521e8	61	int err;
8ffbc655	62
8ffbc655 HV	63	if (v4l2_i2c_data.remove)
8ffbc655 HV	64	v4l2_i2c_data.remove(client);
a2e521e8 HV	65
	66	err = i2c_detach_client(client);
	67	if (err)
	68	return err;
8ffbc655 HV	69	kfree(client);
	70
	71	return 0;
	72	}
	73
	74	static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state)
	75	{
	76	return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0;
	77	}
	78
	79	static int v4l2_i2c_drv_resume_helper(struct i2c_client *client)
	80	{
	81	return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0;
	82	}
	83
	84	/* ----------------------------------------------------------------------- */
	85
	86	/* i2c implementation */
	87	static struct i2c_driver v4l2_i2c_driver_legacy = {
	88	.driver = {
	89	.owner = THIS_MODULE,
	90	},
	91	.attach_adapter = v4l2_i2c_drv_probe_legacy,
	92	.detach_client = v4l2_i2c_drv_detach_legacy,
	93	.suspend = v4l2_i2c_drv_suspend_helper,
	94	.resume = v4l2_i2c_drv_resume_helper,
	95	};
	96
	97	/* ----------------------------------------------------------------------- */
	98
	99	/* i2c implementation */
	100	static struct i2c_driver v4l2_i2c_driver = {
	101	.suspend = v4l2_i2c_drv_suspend_helper,
	102	.resume = v4l2_i2c_drv_resume_helper,
	103	};
	104
	105	static int __init v4l2_i2c_drv_init(void)
	106	{
	107	int err;
	108
	109	strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy));
	110	strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy));
	111
	112	if (v4l2_i2c_data.legacy_class == 0)
	113	v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG;
	114
	115	v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy;
	116	v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid;
	117	v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command;
	118	err = i2c_add_driver(&v4l2_i2c_driver_legacy);
	119
	120	if (err)
	121	return err;
	122	v4l2_i2c_driver.driver.name = v4l2_i2c_data.name;
	123	v4l2_i2c_driver.id = v4l2_i2c_data.driverid;
	124	v4l2_i2c_driver.command = v4l2_i2c_data.command;
	125	v4l2_i2c_driver.probe = v4l2_i2c_data.probe;
	126	v4l2_i2c_driver.remove = v4l2_i2c_data.remove;
	127	err = i2c_add_driver(&v4l2_i2c_driver);
	128	if (err)
	129	i2c_del_driver(&v4l2_i2c_driver_legacy);
	130	return err;
	131	}
	132
133	static void __exit v4l2_i2c_drv_cleanup(void)
134	{
135	i2c_del_driver(&v4l2_i2c_driver_legacy);
136	i2c_del_driver(&v4l2_i2c_driver);
137	}
138
139	module_init(v4l2_i2c_drv_init);
140	module_exit(v4l2_i2c_drv_cleanup);