[mirror_ubuntu-artful-kernel.git] / drivers / media / i2c / tea6420.c

 /*
    tea6420 - i2c-driver for the tea6420 by SGS Thomson

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

    The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
    4 stereo outputs and gain control for each output.
    It is cascadable, i.e. it can be found at the addresses 0x98
    and 0x9a 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 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.
  */


#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include "tea6420.h"

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6420 driver");
MODULE_LICENSE("GPL");

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

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


/* make a connection between the input 'i' and the output 'o'
   with gain 'g' (note: i = 6 means 'mute') */
static int tea6420_s_routing(struct v4l2_subdev *sd,
			     u32 i, u32 o, u32 config)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int g = (o >> 4) & 0xf;
	u8 byte;
	int ret;

	o &= 0xf;
	v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);

	/* check if the parameters are valid */
	if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
		return -EINVAL;

	byte = ((o - 1) << 5);
	byte |= (i - 1);

	/* to understand this, have a look at the tea6420-specs (p.5) */
	switch (g) {
	case 0:
		byte |= (3 << 3);
		break;
	case 2:
		byte |= (2 << 3);
		break;
	case 4:
		byte |= (1 << 3);
		break;
	case 6:
		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 0;
}

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

static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
	.s_routing = tea6420_s_routing,
};

static const struct v4l2_subdev_ops tea6420_ops = {
	.audio = &tea6420_audio_ops,
};

static int tea6420_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct v4l2_subdev *sd;
	int err, i;

	/* 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, &tea6420_ops);

	/* set initial values: set "mute"-input to all outputs at gain 0 */
	err = 0;
	for (i = 1; i < 5; i++)
		err += tea6420_s_routing(sd, 6, i, 0);
	if (err) {
		v4l_dbg(1, debug, client, "could not initialize tea6420\n");
		return -ENODEV;
	}
	return 0;
}

static int tea6420_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 tea6420_id[] = {
	{ "tea6420", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tea6420_id);

static struct i2c_driver tea6420_driver = {
	.driver = {
		.name	= "tea6420",
	},
	.probe		= tea6420_probe,
	.remove		= tea6420_remove,
	.id_table	= tea6420_id,
};

module_i2c_driver(tea6420_driver);
Commit	Line	Data
1da177e4 LT	1	/*
	2	tea6420 - i2c-driver for the tea6420 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 tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
	8	4 stereo outputs and gain control for each output.
3ad2f3fb	9	It is cascadable, i.e. it can be found at the addresses 0x98
1da177e4 LT	10	and 0x9a 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 as 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 Mass 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>
2a5b828d	35	#include <media/v4l2-device.h>
1da177e4 LT	36	#include "tea6420.h"
1da177e4 LT	37
a832781c HV	38	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	39	MODULE_DESCRIPTION("tea6420 driver");
	40	MODULE_LICENSE("GPL");
	41
	42	static int debug;
1da177e4	43	module_param(debug, int, 0644);
f87086e3	44
a832781c	45	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4	46
1da177e4	47
1da177e4	48	/* make a connection between the input 'i' and the output 'o'
1b8dac15	49	with gain 'g' (note: i = 6 means 'mute') */
5325b427 HV	50	static int tea6420_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);
5325b427	54	int g = (o >> 4) & 0xf;
a832781c	55	u8 byte;
1da177e4 LT	56	int ret;
1da177e4 LT	57
5325b427	58	o &= 0xf;
1b8dac15	59	v4l2_dbg(1, debug, sd, "i=%d, o=%d, g=%d\n", i, o, g);
1da177e4	60
c84e6036	61	/* check if the parameters are valid */
1da177e4	62	if (i < 1 \|\| i > 6 \|\| o < 1 \|\| o > 4 \|\| g < 0 \|\| g > 6 \|\| g % 2 != 0)
1b8dac15	63	return -EINVAL;
1da177e4	64
a832781c	65	byte = ((o - 1) << 5);
1da177e4 LT	66	byte \|= (i - 1);
	67
	68	/* to understand this, have a look at the tea6420-specs (p.5) */
	69	switch (g) {
	70	case 0:
	71	byte \|= (3 << 3);
	72	break;
	73	case 2:
	74	byte \|= (2 << 3);
	75	break;
	76	case 4:
	77	byte \|= (1 << 3);
	78	break;
	79	case 6:
	80	break;
	81	}
	82
	83	ret = i2c_smbus_write_byte(client, byte);
	84	if (ret) {
1b8dac15	85	v4l2_dbg(1, debug, sd,
a832781c	86	"i2c_smbus_write_byte() failed, ret:%d\n", ret);
1da177e4 LT	87	return -EIO;
1da177e4 LT	88	}
1da177e4 LT	89	return 0;
	90	}
	91
2a5b828d HV	92	/* ----------------------------------------------------------------------- */
2a5b828d HV	93
1b8dac15 HV	94	static const struct v4l2_subdev_audio_ops tea6420_audio_ops = {
1b8dac15 HV	95	.s_routing = tea6420_s_routing,
2a5b828d HV	96	};
	97
	98	static const struct v4l2_subdev_ops tea6420_ops = {
1b8dac15	99	.audio = &tea6420_audio_ops,
2a5b828d HV	100	};
2a5b828d HV	101
a832781c HV	102	static int tea6420_probe(struct i2c_client *client,
	103	const struct i2c_device_id *id)
	104	{
2a5b828d	105	struct v4l2_subdev *sd;
a832781c	106	int err, i;
1da177e4	107
a832781c HV	108	/* let's see whether this adapter can support what we need */
	109	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
	110	return -EIO;
	111
	112	v4l_info(client, "chip found @ 0x%x (%s)\n",
	113	client->addr << 1, client->adapter->name);
1da177e4	114
c02b211d	115	sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
1b8dac15 HV	116	if (sd == NULL)
	117	return -ENOMEM;
	118	v4l2_i2c_subdev_init(sd, client, &tea6420_ops);
	119
1da177e4 LT	120	/* set initial values: set "mute"-input to all outputs at gain 0 */
1da177e4 LT	121	err = 0;
5325b427 HV	122	for (i = 1; i < 5; i++)
5325b427 HV	123	err += tea6420_s_routing(sd, 6, i, 0);
1da177e4	124	if (err) {
a832781c	125	v4l_dbg(1, debug, client, "could not initialize tea6420\n");
1da177e4 LT	126	return -ENODEV;
1da177e4 LT	127	}
2a5b828d HV	128	return 0;
	129	}
	130
	131	static int tea6420_remove(struct i2c_client *client)
	132	{
	133	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	134
	135	v4l2_device_unregister_subdev(sd);
1da177e4 LT	136	return 0;
	137	}
	138
a832781c HV	139	static const struct i2c_device_id tea6420_id[] = {
	140	{ "tea6420", 0 },
	141	{ }
1da177e4	142	};
a832781c	143	MODULE_DEVICE_TABLE(i2c, tea6420_id);
1da177e4	144
e2c52ba6 HV	145	static struct i2c_driver tea6420_driver = {
e2c52ba6 HV	146	.driver = {
e2c52ba6 HV	147	.name = "tea6420",
	148	},
	149	.probe = tea6420_probe,
	150	.remove = tea6420_remove,
	151	.id_table = tea6420_id,
1da177e4	152	};
e2c52ba6	153
c6e8d86f	154	module_i2c_driver(tea6420_driver);