[net-next-2.6.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/slab.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.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)");


/* makes a connection between the input-pin 'i' and the output-pin 'o' */
static int tea6415c_s_routing(struct v4l2_subdev *sd,
			      u32 i, u32 o, u32 config)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	u8 byte = 0;
	int ret;

	v4l2_dbg(1, debug, sd, "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 -EINVAL;

	/* 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) {
		v4l2_dbg(1, debug, sd,
			"i2c_smbus_write_byte() failed, ret:%d\n", ret);
		return -EIO;
	}
	return ret;
}

static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
}

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

static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
	.g_chip_ident = tea6415c_g_chip_ident,
};

static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
	.s_routing = tea6415c_s_routing,
};

static const struct v4l2_subdev_ops tea6415c_ops = {
	.core = &tea6415c_core_ops,
	.video = &tea6415c_video_ops,
};

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

static struct i2c_driver tea6415c_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "tea6415c",
	},
	.probe		= tea6415c_probe,
	.remove		= tea6415c_remove,
	.id_table	= tea6415c_id,
};

static __init int init_tea6415c(void)
{
	return i2c_add_driver(&tea6415c_driver);
}

static __exit void exit_tea6415c(void)
{
	i2c_del_driver(&tea6415c_driver);
}

module_init(init_tea6415c);
module_exit(exit_tea6415c);
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>
1da177e4 LT	32	#include <linux/ioctl.h>
5a0e3ad6	33	#include <linux/slab.h>
1da177e4	34	#include <linux/i2c.h>
85d826b0	35	#include <media/v4l2-device.h>
1b8dac15	36	#include <media/v4l2-chip-ident.h>
1da177e4 LT	37	#include "tea6415c.h"
1da177e4 LT	38
a832781c HV	39	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	40	MODULE_DESCRIPTION("tea6415c driver");
	41	MODULE_LICENSE("GPL");
f87086e3	42
a832781c HV	43	static int debug;
a832781c HV	44	module_param(debug, int, 0644);
1da177e4	45
a832781c	46	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4	47
1da177e4	48
1b8dac15	49	/* makes a connection between the input-pin 'i' and the output-pin 'o' */
5325b427 HV	50	static int tea6415c_s_routing(struct v4l2_subdev *sd,
5325b427 HV	51	u32 i, u32 o, u32 config)
1da177e4	52	{
1b8dac15	53	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4 LT	54	u8 byte = 0;
1da177e4 LT	55	int ret;
a8733ca5	56
1b8dac15	57	v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
1da177e4 LT	58
	59	/* check if the pins are valid */
	60	if (0 == ((1 == i \|\| 3 == i \|\| 5 == i \|\| 6 == i \|\| 8 == i \|\| 10 == i \|\| 20 == i \|\| 11 == i)
	61	&& (18 == o \|\| 17 == o \|\| 16 == o \|\| 15 == o \|\| 14 == o \|\| 13 == o)))
1b8dac15	62	return -EINVAL;
1da177e4 LT	63
	64	/* to understand this, have a look at the tea6415c-specs (p.5) */
	65	switch (o) {
	66	case 18:
	67	byte = 0x00;
	68	break;
	69	case 14:
	70	byte = 0x20;
	71	break;
	72	case 16:
	73	byte = 0x10;
	74	break;
	75	case 17:
	76	byte = 0x08;
	77	break;
	78	case 15:
	79	byte = 0x18;
	80	break;
	81	case 13:
	82	byte = 0x28;
	83	break;
	84	};
	85
	86	switch (i) {
	87	case 5:
	88	byte \|= 0x00;
	89	break;
	90	case 8:
	91	byte \|= 0x04;
	92	break;
	93	case 3:
	94	byte \|= 0x02;
	95	break;
	96	case 20:
	97	byte \|= 0x06;
	98	break;
	99	case 6:
	100	byte \|= 0x01;
	101	break;
	102	case 10:
	103	byte \|= 0x05;
	104	break;
	105	case 1:
	106	byte \|= 0x03;
	107	break;
	108	case 11:
	109	byte \|= 0x07;
	110	break;
	111	};
	112
	113	ret = i2c_smbus_write_byte(client, byte);
	114	if (ret) {
1b8dac15	115	v4l2_dbg(1, debug, sd,
a832781c	116	"i2c_smbus_write_byte() failed, ret:%d\n", ret);
1da177e4 LT	117	return -EIO;
1da177e4 LT	118	}
1da177e4 LT	119	return ret;
	120	}
	121
1b8dac15	122	static int tea6415c_g_chip_ident(struct v4l2_subdev sd, struct v4l2_dbg_chip_ident chip)
1da177e4	123	{
1b8dac15	124	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4	125
1b8dac15	126	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
85d826b0 HV	127	}
	128
	129	/* ----------------------------------------------------------------------- */
	130
	131	static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
1b8dac15 HV	132	.g_chip_ident = tea6415c_g_chip_ident,
	133	};
	134
	135	static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
	136	.s_routing = tea6415c_s_routing,
85d826b0 HV	137	};
	138
	139	static const struct v4l2_subdev_ops tea6415c_ops = {
	140	.core = &tea6415c_core_ops,
1b8dac15	141	.video = &tea6415c_video_ops,
85d826b0 HV	142	};
85d826b0 HV	143
a832781c HV	144	static int tea6415c_probe(struct i2c_client *client,
a832781c HV	145	const struct i2c_device_id *id)
1da177e4	146	{
85d826b0 HV	147	struct v4l2_subdev *sd;
85d826b0 HV	148
a832781c HV	149	/* let's see whether this adapter can support what we need */
	150	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
	151	return 0;
	152
	153	v4l_info(client, "chip found @ 0x%x (%s)\n",
	154	client->addr << 1, client->adapter->name);
85d826b0 HV	155	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	156	if (sd == NULL)
	157	return -ENOMEM;
	158	v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
	159	return 0;
	160	}
	161
	162	static int tea6415c_remove(struct i2c_client *client)
	163	{
	164	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	165
	166	v4l2_device_unregister_subdev(sd);
	167	kfree(sd);
a832781c	168	return 0;
1da177e4 LT	169	}
1da177e4 LT	170
a832781c HV	171	static const struct i2c_device_id tea6415c_id[] = {
	172	{ "tea6415c", 0 },
	173	{ }
	174	};
	175	MODULE_DEVICE_TABLE(i2c, tea6415c_id);
1da177e4	176
0c748826 HV	177	static struct i2c_driver tea6415c_driver = {
	178	.driver = {
	179	.owner = THIS_MODULE,
	180	.name = "tea6415c",
	181	},
	182	.probe = tea6415c_probe,
	183	.remove = tea6415c_remove,
	184	.id_table = tea6415c_id,
a832781c	185	};
0c748826 HV	186
	187	static __init int init_tea6415c(void)
	188	{
	189	return i2c_add_driver(&tea6415c_driver);
	190	}
	191
	192	static __exit void exit_tea6415c(void)
	193	{
	194	i2c_del_driver(&tea6415c_driver);
	195	}
	196
	197	module_init(init_tea6415c);
	198	module_exit(exit_tea6415c);