[GitHub/mt8127/android_kernel_alcatel_ttab.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 <media/v4l2-i2c-drv.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 v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "tea6415c",
	.probe = tea6415c_probe,
	.remove = tea6415c_remove,
	.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>
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 HV	36	#include <media/v4l2-chip-ident.h>
1b8dac15 HV	37	#include <media/v4l2-i2c-drv.h>
1da177e4 LT	38	#include "tea6415c.h"
1da177e4 LT	39
a832781c HV	40	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	41	MODULE_DESCRIPTION("tea6415c driver");
	42	MODULE_LICENSE("GPL");
f87086e3	43
a832781c HV	44	static int debug;
a832781c HV	45	module_param(debug, int, 0644);
1da177e4	46
a832781c	47	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4	48
1da177e4	49
1b8dac15	50	/* makes a connection between the input-pin 'i' and the output-pin 'o' */
5325b427 HV	51	static int tea6415c_s_routing(struct v4l2_subdev *sd,
5325b427 HV	52	u32 i, u32 o, u32 config)
1da177e4	53	{
1b8dac15	54	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4 LT	55	u8 byte = 0;
1da177e4 LT	56	int ret;
a8733ca5	57
1b8dac15	58	v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
1da177e4 LT	59
	60	/* check if the pins are valid */
	61	if (0 == ((1 == i \|\| 3 == i \|\| 5 == i \|\| 6 == i \|\| 8 == i \|\| 10 == i \|\| 20 == i \|\| 11 == i)
	62	&& (18 == o \|\| 17 == o \|\| 16 == o \|\| 15 == o \|\| 14 == o \|\| 13 == o)))
1b8dac15	63	return -EINVAL;
1da177e4 LT	64
	65	/* to understand this, have a look at the tea6415c-specs (p.5) */
	66	switch (o) {
	67	case 18:
	68	byte = 0x00;
	69	break;
	70	case 14:
	71	byte = 0x20;
	72	break;
	73	case 16:
	74	byte = 0x10;
	75	break;
	76	case 17:
	77	byte = 0x08;
	78	break;
	79	case 15:
	80	byte = 0x18;
	81	break;
	82	case 13:
	83	byte = 0x28;
	84	break;
	85	};
	86
	87	switch (i) {
	88	case 5:
	89	byte \|= 0x00;
	90	break;
	91	case 8:
	92	byte \|= 0x04;
	93	break;
	94	case 3:
	95	byte \|= 0x02;
	96	break;
	97	case 20:
	98	byte \|= 0x06;
	99	break;
	100	case 6:
	101	byte \|= 0x01;
	102	break;
	103	case 10:
	104	byte \|= 0x05;
	105	break;
	106	case 1:
	107	byte \|= 0x03;
	108	break;
	109	case 11:
	110	byte \|= 0x07;
	111	break;
	112	};
	113
	114	ret = i2c_smbus_write_byte(client, byte);
	115	if (ret) {
1b8dac15	116	v4l2_dbg(1, debug, sd,
a832781c	117	"i2c_smbus_write_byte() failed, ret:%d\n", ret);
1da177e4 LT	118	return -EIO;
1da177e4 LT	119	}
1da177e4 LT	120	return ret;
	121	}
	122
1b8dac15	123	static int tea6415c_g_chip_ident(struct v4l2_subdev sd, struct v4l2_dbg_chip_ident chip)
1da177e4	124	{
1b8dac15	125	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4	126
1b8dac15	127	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
85d826b0 HV	128	}
	129
	130	/* ----------------------------------------------------------------------- */
	131
	132	static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
1b8dac15 HV	133	.g_chip_ident = tea6415c_g_chip_ident,
	134	};
	135
	136	static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
	137	.s_routing = tea6415c_s_routing,
85d826b0 HV	138	};
	139
	140	static const struct v4l2_subdev_ops tea6415c_ops = {
	141	.core = &tea6415c_core_ops,
1b8dac15	142	.video = &tea6415c_video_ops,
85d826b0 HV	143	};
85d826b0 HV	144
a832781c HV	145	static int tea6415c_probe(struct i2c_client *client,
a832781c HV	146	const struct i2c_device_id *id)
1da177e4	147	{
85d826b0 HV	148	struct v4l2_subdev *sd;
85d826b0 HV	149
a832781c HV	150	/* let's see whether this adapter can support what we need */
	151	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
	152	return 0;
	153
	154	v4l_info(client, "chip found @ 0x%x (%s)\n",
	155	client->addr << 1, client->adapter->name);
85d826b0 HV	156	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	157	if (sd == NULL)
	158	return -ENOMEM;
	159	v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
	160	return 0;
	161	}
	162
	163	static int tea6415c_remove(struct i2c_client *client)
	164	{
	165	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	166
	167	v4l2_device_unregister_subdev(sd);
	168	kfree(sd);
a832781c	169	return 0;
1da177e4 LT	170	}
1da177e4 LT	171
a832781c HV	172	static const struct i2c_device_id tea6415c_id[] = {
	173	{ "tea6415c", 0 },
	174	{ }
	175	};
	176	MODULE_DEVICE_TABLE(i2c, tea6415c_id);
1da177e4	177
a832781c HV	178	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
a832781c HV	179	.name = "tea6415c",
a832781c	180	.probe = tea6415c_probe,
85d826b0	181	.remove = tea6415c_remove,
a832781c HV	182	.id_table = tea6415c_id,
a832781c HV	183	};