[deliverable/linux.git] / drivers / media / video / tea6415c.c

 /*
    tea6415c - i2c-driver for the tea6415c by SGS Thomson

    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>

    The tea6415c is a bus controlled video-matrix-switch
    with 8 inputs and 6 outputs.
    It is cascadable, i.e. it can be found at the addresses
    0x86 and 0x06 on the i2c-bus.

    For detailed informations download the specifications directly
    from SGS Thomson at http://www.st.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License vs 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 Mvss Ave, Cambridge, MA 02139, USA.
  */


#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-i2c-drv-legacy.h>
#include "tea6415c.h"

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6415c driver");
MODULE_LICENSE("GPL");

static int debug;
module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "Debug level (0-1)");

/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };

/* magic definition of all other variables and things */
I2C_CLIENT_INSMOD;

/* makes a connection between the input-pin 'i' and the output-pin 'o'
   for the tea6415c-client 'client' */
static int switch_matrix(struct i2c_client *client, int i, int o)
{
	u8 byte = 0;
	int ret;

	v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o);

	/* check if the pins are valid */
	if (0 == ((1 == i ||  3 == i ||  5 == i ||  6 == i ||  8 == i || 10 == i || 20 == i || 11 == i)
	      && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
		return -1;

	/* to understand this, have a look at the tea6415c-specs (p.5) */
	switch (o) {
	case 18:
		byte = 0x00;
		break;
	case 14:
		byte = 0x20;
		break;
	case 16:
		byte = 0x10;
		break;
	case 17:
		byte = 0x08;
		break;
	case 15:
		byte = 0x18;
		break;
	case 13:
		byte = 0x28;
		break;
	};

	switch (i) {
	case 5:
		byte |= 0x00;
		break;
	case 8:
		byte |= 0x04;
		break;
	case 3:
		byte |= 0x02;
		break;
	case 20:
		byte |= 0x06;
		break;
	case 6:
		byte |= 0x01;
		break;
	case 10:
		byte |= 0x05;
		break;
	case 1:
		byte |= 0x03;
		break;
	case 11:
		byte |= 0x07;
		break;
	};

	ret = i2c_smbus_write_byte(client, byte);
	if (ret) {
		v4l_dbg(1, debug, client,
			"i2c_smbus_write_byte() failed, ret:%d\n", ret);
		return -EIO;
	}
	return ret;
}

static long tea6415c_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg)
{
	if (cmd == TEA6415C_SWITCH) {
		struct i2c_client *client = v4l2_get_subdevdata(sd);
		struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;

		return switch_matrix(client, v->in, v->out);
	}
	return -ENOIOCTLCMD;
}

static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
}

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

static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
	.ioctl = tea6415c_ioctl,
};

static const struct v4l2_subdev_ops tea6415c_ops = {
	.core = &tea6415c_core_ops,
};

/* this function is called by i2c_probe */
static int tea6415c_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct v4l2_subdev *sd;

	/* let's see whether this adapter can support what we need */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
		return 0;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);
	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	if (sd == NULL)
		return -ENOMEM;
	v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
	return 0;
}

static int tea6415c_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(sd);
	return 0;
}

static int tea6415c_legacy_probe(struct i2c_adapter *adapter)
{
	/* Let's see whether this is a known adapter we can attach to.
	   Prevents conflicts with tvaudio.c. */
	return adapter->id == I2C_HW_SAA7146;
}

static const struct i2c_device_id tea6415c_id[] = {
	{ "tea6415c", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tea6415c_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "tea6415c",
	.driverid = I2C_DRIVERID_TEA6415C,
	.command = tea6415c_command,
	.probe = tea6415c_probe,
	.remove = tea6415c_remove,
	.legacy_probe = tea6415c_legacy_probe,
	.id_table = tea6415c_id,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	tea6415c - i2c-driver for the tea6415c by SGS Thomson
	3
	4	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
a832781c	5	Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
1da177e4 LT	6
	7	The tea6415c is a bus controlled video-matrix-switch
	8	with 8 inputs and 6 outputs.
	9	It is cascadable, i.e. it can be found at the addresses
	10	0x86 and 0x06 on the i2c-bus.
	11
	12	For detailed informations download the specifications directly
	13	from SGS Thomson at http://www.st.com
	14
	15	This program is free software; you can redistribute it and/or modify
	16	it under the terms of the GNU General Public License vs published by
	17	the Free Software Foundation; either version 2 of the License, or
	18	(at your option) any later version.
	19
	20	This program is distributed in the hope that it will be useful,
	21	but WITHOUT ANY WARRANTY; without even the implied warranty of
	22	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	23	GNU General Public License for more details.
	24
	25	You should have received a copy of the GNU General Public License
	26	along with this program; if not, write to the Free Software
	27	Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
	28	*/
	29
a8733ca5	30
1da177e4 LT	31	#include <linux/module.h>
	32	#include <linux/ioctl.h>
	33	#include <linux/i2c.h>
85d826b0	34	#include <media/v4l2-device.h>
a832781c	35	#include <media/v4l2-i2c-drv-legacy.h>
1da177e4 LT	36	#include "tea6415c.h"
1da177e4 LT	37
a832781c HV	38	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	39	MODULE_DESCRIPTION("tea6415c driver");
	40	MODULE_LICENSE("GPL");
f87086e3	41
a832781c HV	42	static int debug;
a832781c HV	43	module_param(debug, int, 0644);
1da177e4	44
a832781c	45	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4 LT	46
	47	/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
	48	static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };
1da177e4 LT	49
	50	/* magic definition of all other variables and things */
	51	I2C_CLIENT_INSMOD;
	52
1da177e4 LT	53	/* makes a connection between the input-pin 'i' and the output-pin 'o'
	54	for the tea6415c-client 'client' */
	55	static int switch_matrix(struct i2c_client *client, int i, int o)
	56	{
	57	u8 byte = 0;
	58	int ret;
a8733ca5	59
a832781c	60	v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o);
1da177e4 LT	61
	62	/* check if the pins are valid */
	63	if (0 == ((1 == i \|\| 3 == i \|\| 5 == i \|\| 6 == i \|\| 8 == i \|\| 10 == i \|\| 20 == i \|\| 11 == i)
	64	&& (18 == o \|\| 17 == o \|\| 16 == o \|\| 15 == o \|\| 14 == o \|\| 13 == o)))
	65	return -1;
	66
	67	/* to understand this, have a look at the tea6415c-specs (p.5) */
	68	switch (o) {
	69	case 18:
	70	byte = 0x00;
	71	break;
	72	case 14:
	73	byte = 0x20;
	74	break;
	75	case 16:
	76	byte = 0x10;
	77	break;
	78	case 17:
	79	byte = 0x08;
	80	break;
	81	case 15:
	82	byte = 0x18;
	83	break;
	84	case 13:
	85	byte = 0x28;
	86	break;
	87	};
	88
	89	switch (i) {
	90	case 5:
	91	byte \|= 0x00;
	92	break;
	93	case 8:
	94	byte \|= 0x04;
	95	break;
	96	case 3:
	97	byte \|= 0x02;
	98	break;
	99	case 20:
	100	byte \|= 0x06;
	101	break;
	102	case 6:
	103	byte \|= 0x01;
	104	break;
	105	case 10:
	106	byte \|= 0x05;
	107	break;
	108	case 1:
	109	byte \|= 0x03;
	110	break;
	111	case 11:
	112	byte \|= 0x07;
	113	break;
	114	};
	115
	116	ret = i2c_smbus_write_byte(client, byte);
	117	if (ret) {
a832781c HV	118	v4l_dbg(1, debug, client,
a832781c HV	119	"i2c_smbus_write_byte() failed, ret:%d\n", ret);
1da177e4 LT	120	return -EIO;
1da177e4 LT	121	}
1da177e4 LT	122	return ret;
	123	}
	124
069b7479	125	static long tea6415c_ioctl(struct v4l2_subdev sd, unsigned cmd, void arg)
1da177e4	126	{
85d826b0 HV	127	if (cmd == TEA6415C_SWITCH) {
	128	struct i2c_client *client = v4l2_get_subdevdata(sd);
	129	struct tea6415c_multiplex v = (struct tea6415c_multiplex )arg;
1da177e4	130
85d826b0	131	return switch_matrix(client, v->in, v->out);
1da177e4	132	}
85d826b0	133	return -ENOIOCTLCMD;
1da177e4 LT	134	}
1da177e4 LT	135
85d826b0 HV	136	static int tea6415c_command(struct i2c_client client, unsigned cmd, void arg)
	137	{
	138	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
	139	}
	140
	141	/* ----------------------------------------------------------------------- */
	142
	143	static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
	144	.ioctl = tea6415c_ioctl,
	145	};
	146
	147	static const struct v4l2_subdev_ops tea6415c_ops = {
	148	.core = &tea6415c_core_ops,
	149	};
	150
a832781c HV	151	/* this function is called by i2c_probe */
	152	static int tea6415c_probe(struct i2c_client *client,
	153	const struct i2c_device_id *id)
1da177e4	154	{
85d826b0 HV	155	struct v4l2_subdev *sd;
85d826b0 HV	156
a832781c HV	157	/* let's see whether this adapter can support what we need */
	158	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
	159	return 0;
	160
	161	v4l_info(client, "chip found @ 0x%x (%s)\n",
	162	client->addr << 1, client->adapter->name);
85d826b0 HV	163	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	164	if (sd == NULL)
	165	return -ENOMEM;
	166	v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
	167	return 0;
	168	}
	169
	170	static int tea6415c_remove(struct i2c_client *client)
	171	{
	172	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	173
	174	v4l2_device_unregister_subdev(sd);
	175	kfree(sd);
a832781c	176	return 0;
1da177e4 LT	177	}
1da177e4 LT	178
a832781c	179	static int tea6415c_legacy_probe(struct i2c_adapter *adapter)
1da177e4	180	{
a832781c HV	181	/* Let's see whether this is a known adapter we can attach to.
	182	Prevents conflicts with tvaudio.c. */
	183	return adapter->id == I2C_HW_SAA7146;
1da177e4 LT	184	}
1da177e4 LT	185
a832781c HV	186	static const struct i2c_device_id tea6415c_id[] = {
	187	{ "tea6415c", 0 },
	188	{ }
	189	};
	190	MODULE_DEVICE_TABLE(i2c, tea6415c_id);
1da177e4	191
a832781c HV	192	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	193	.name = "tea6415c",
	194	.driverid = I2C_DRIVERID_TEA6415C,
	195	.command = tea6415c_command,
	196	.probe = tea6415c_probe,
85d826b0	197	.remove = tea6415c_remove,
a832781c HV	198	.legacy_probe = tea6415c_legacy_probe,
	199	.id_table = tea6415c_id,
	200	};