[mirror_ubuntu-artful-kernel.git] / drivers / media / i2c / 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 "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 const struct v4l2_subdev_video_ops tea6415c_video_ops = {
	.s_routing = tea6415c_s_routing,
};

static const struct v4l2_subdev_ops tea6415c_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 -EIO;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);
	sd = devm_kzalloc(&client->dev, sizeof(*sd), 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);
	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 = {
		.name	= "tea6415c",
	},
	.probe		= tea6415c_probe,
	.remove		= tea6415c_remove,
	.id_table	= tea6415c_id,
};

module_i2c_driver(tea6415c_driver);
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>
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	46
1da177e4	47
1b8dac15	48	/* makes a connection between the input-pin 'i' and the output-pin 'o' */
5325b427 HV	49	static int tea6415c_s_routing(struct v4l2_subdev *sd,
5325b427 HV	50	u32 i, u32 o, u32 config)
1da177e4	51	{
1b8dac15	52	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4 LT	53	u8 byte = 0;
1da177e4 LT	54	int ret;
a8733ca5	55
1b8dac15	56	v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
1da177e4 LT	57
	58	/* check if the pins are valid */
	59	if (0 == ((1 == i \|\| 3 == i \|\| 5 == i \|\| 6 == i \|\| 8 == i \|\| 10 == i \|\| 20 == i \|\| 11 == i)
	60	&& (18 == o \|\| 17 == o \|\| 16 == o \|\| 15 == o \|\| 14 == o \|\| 13 == o)))
1b8dac15	61	return -EINVAL;
1da177e4 LT	62
	63	/* to understand this, have a look at the tea6415c-specs (p.5) */
	64	switch (o) {
	65	case 18:
	66	byte = 0x00;
	67	break;
	68	case 14:
	69	byte = 0x20;
	70	break;
	71	case 16:
	72	byte = 0x10;
	73	break;
	74	case 17:
	75	byte = 0x08;
	76	break;
	77	case 15:
	78	byte = 0x18;
	79	break;
	80	case 13:
	81	byte = 0x28;
	82	break;
3ea0a1d1	83	}
1da177e4 LT	84
	85	switch (i) {
	86	case 5:
	87	byte \|= 0x00;
	88	break;
	89	case 8:
	90	byte \|= 0x04;
	91	break;
	92	case 3:
	93	byte \|= 0x02;
	94	break;
	95	case 20:
	96	byte \|= 0x06;
	97	break;
	98	case 6:
	99	byte \|= 0x01;
	100	break;
	101	case 10:
	102	byte \|= 0x05;
	103	break;
	104	case 1:
	105	byte \|= 0x03;
	106	break;
	107	case 11:
	108	byte \|= 0x07;
	109	break;
3ea0a1d1	110	}
1da177e4 LT	111
	112	ret = i2c_smbus_write_byte(client, byte);
	113	if (ret) {
1b8dac15	114	v4l2_dbg(1, debug, sd,
a832781c	115	"i2c_smbus_write_byte() failed, ret:%d\n", ret);
1da177e4 LT	116	return -EIO;
1da177e4 LT	117	}
1da177e4 LT	118	return ret;
	119	}
	120
85d826b0 HV	121	/* ----------------------------------------------------------------------- */
85d826b0 HV	122
1b8dac15 HV	123	static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
1b8dac15 HV	124	.s_routing = tea6415c_s_routing,
85d826b0 HV	125	};
	126
	127	static const struct v4l2_subdev_ops tea6415c_ops = {
1b8dac15	128	.video = &tea6415c_video_ops,
85d826b0 HV	129	};
85d826b0 HV	130
a832781c HV	131	static int tea6415c_probe(struct i2c_client *client,
a832781c HV	132	const struct i2c_device_id *id)
1da177e4	133	{
85d826b0 HV	134	struct v4l2_subdev *sd;
85d826b0 HV	135
a832781c HV	136	/* let's see whether this adapter can support what we need */
a832781c HV	137	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
76e4a9a7	138	return -EIO;
a832781c HV	139
	140	v4l_info(client, "chip found @ 0x%x (%s)\n",
	141	client->addr << 1, client->adapter->name);
c02b211d	142	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
85d826b0 HV	143	if (sd == NULL)
	144	return -ENOMEM;
	145	v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
	146	return 0;
	147	}
	148
	149	static int tea6415c_remove(struct i2c_client *client)
	150	{
	151	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	152
	153	v4l2_device_unregister_subdev(sd);
a832781c	154	return 0;
1da177e4 LT	155	}
1da177e4 LT	156
a832781c HV	157	static const struct i2c_device_id tea6415c_id[] = {
	158	{ "tea6415c", 0 },
	159	{ }
	160	};
	161	MODULE_DEVICE_TABLE(i2c, tea6415c_id);
1da177e4	162
0c748826 HV	163	static struct i2c_driver tea6415c_driver = {
0c748826 HV	164	.driver = {
0c748826 HV	165	.name = "tea6415c",
	166	},
	167	.probe = tea6415c_probe,
	168	.remove = tea6415c_remove,
	169	.id_table = tea6415c_id,
a832781c	170	};
0c748826	171
c6e8d86f	172	module_i2c_driver(tea6415c_driver);