[linux-2.6-block.git] / drivers / media / video / tda9840.c

 /*
    tda9840 - i2c-driver for the tda9840 by SGS Thomson

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

    The tda9840 is a stereo/dual sound processor with digital
    identification. It can be found at address 0x84 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/i2c.h>
#include <media/v4l2-common.h>
#include <media/v4l2-i2c-drv-legacy.h>
#include "tda9840.h"

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tda9840 driver");
MODULE_LICENSE("GPL");

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

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

#define	SWITCH		0x00
#define	LEVEL_ADJUST	0x02
#define	STEREO_ADJUST	0x03
#define	TEST		0x04

/* addresses to scan, found only at 0x42 (7-Bit) */
static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };

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

static void tda9840_write(struct i2c_client *client, u8 reg, u8 val)
{
	if (i2c_smbus_write_byte_data(client, reg, val))
		v4l_dbg(1, debug, client, "error writing %02x to %02x\n",
				val, reg);
}

static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	int result;
	int byte = *(int *)arg;

	switch (cmd) {
	case TDA9840_SWITCH:
		v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);

		if (byte != TDA9840_SET_MONO
		    && byte != TDA9840_SET_MUTE
		    && byte != TDA9840_SET_STEREO
		    && byte != TDA9840_SET_LANG1
		    && byte != TDA9840_SET_LANG2
		    && byte != TDA9840_SET_BOTH
		    && byte != TDA9840_SET_BOTH_R
		    && byte != TDA9840_SET_EXTERNAL) {
			return -EINVAL;
		}

		tda9840_write(client, SWITCH, byte);
		break;

	case TDA9840_LEVEL_ADJUST:
		v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);

		/* check for correct range */
		if (byte > 25 || byte < -20)
			return -EINVAL;

		/* calculate actual value to set, see specs, page 18 */
		byte /= 5;
		if (0 < byte)
			byte += 0x8;
		else
			byte = -byte;
		tda9840_write(client, LEVEL_ADJUST, byte);
		break;

	case TDA9840_STEREO_ADJUST:
		v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);

		/* check for correct range */
		if (byte > 25 || byte < -24)
			return -EINVAL;

		/* calculate actual value to set */
		byte /= 5;
		if (0 < byte)
			byte += 0x20;
		else
			byte = -byte;

		tda9840_write(client, STEREO_ADJUST, byte);
		break;

	case TDA9840_DETECT: {
		int *ret = (int *)arg;

		byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
		if (byte == -1) {
			v4l_dbg(1, debug, client,
				"i2c_smbus_read_byte_data() failed\n");
			return -EIO;
		}

		if (byte & 0x80) {
			v4l_dbg(1, debug, client,
				"TDA9840_DETECT: register contents invalid\n");
			return -EINVAL;
		}

		v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
		*ret = (byte & 0x60) >> 5;
		result = 0;
		break;
	}
	case TDA9840_TEST:
		v4l_dbg(1, debug, client, "TDA9840_TEST: 0x%02x\n", byte);

		/* mask out irrelevant bits */
		byte &= 0x3;

		tda9840_write(client, TEST, byte);
		break;
	default:
		return -ENOIOCTLCMD;
	}

	if (result)
		return -EIO;

	return 0;
}

static int tda9840_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	int result;
	int byte;

	/* let's see whether this adapter can support what we need */
	if (!i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_READ_BYTE_DATA |
			I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
		return 0;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);

	/* set initial values for level & stereo - adjustment, mode */
	byte = 0;
	result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
	result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
	byte = TDA9840_SET_MONO;
	result = tda9840_command(client, TDA9840_SWITCH, &byte);
	if (result) {
		v4l_dbg(1, debug, client, "could not initialize tda9840\n");
		return -ENODEV;
	}
	return 0;
}

static int tda9840_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 tda9840_id[] = {
	{ "tda9840", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tda9840_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "tda9840",
	.driverid = I2C_DRIVERID_TDA9840,
	.command = tda9840_command,
	.probe = tda9840_probe,
	.legacy_probe = tda9840_legacy_probe,
	.id_table = tda9840_id,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	tda9840 - i2c-driver for the tda9840 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 tda9840 is a stereo/dual sound processor with digital
	8	identification. It can be found at address 0x84 on the i2c-bus.
	9
	10	For detailed informations download the specifications directly
	11	from SGS Thomson at http://www.st.com
	12
	13	This program is free software; you can redistribute it and/or modify
	14	it under the terms of the GNU General Public License as published by
	15	the Free Software Foundation; either version 2 of the License, or
	16	(at your option) any later version.
	17
	18	This program is distributed in the hope that it will be useful,
	19	but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	GNU General Public License for more details.
	22
	23	You should have received a copy of the GNU General Public License
	24	along with this program; if not, write to the Free Software
	25	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	26	*/
	27
a8733ca5	28
1da177e4 LT	29	#include <linux/module.h>
	30	#include <linux/ioctl.h>
	31	#include <linux/i2c.h>
a832781c HV	32	#include <media/v4l2-common.h>
a832781c HV	33	#include <media/v4l2-i2c-drv-legacy.h>
1da177e4 LT	34	#include "tda9840.h"
1da177e4 LT	35
a832781c HV	36	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	37	MODULE_DESCRIPTION("tda9840 driver");
	38	MODULE_LICENSE("GPL");
	39
	40	static int debug;
1da177e4	41	module_param(debug, int, 0644);
f87086e3	42
a832781c	43	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4 LT	44
	45	#define SWITCH 0x00
	46	#define LEVEL_ADJUST 0x02
	47	#define STEREO_ADJUST 0x03
	48	#define TEST 0x04
	49
	50	/* addresses to scan, found only at 0x42 (7-Bit) */
09df1c16	51	static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
1da177e4 LT	52
	53	/* magic definition of all other variables and things */
	54	I2C_CLIENT_INSMOD;
	55
a832781c HV	56	static void tda9840_write(struct i2c_client *client, u8 reg, u8 val)
	57	{
	58	if (i2c_smbus_write_byte_data(client, reg, val))
	59	v4l_dbg(1, debug, client, "error writing %02x to %02x\n",
	60	val, reg);
	61	}
1da177e4	62
a832781c	63	static int tda9840_command(struct i2c_client client, unsigned cmd, void arg)
1da177e4 LT	64	{
	65	int result;
	66	int byte = (int )arg;
	67
	68	switch (cmd) {
	69	case TDA9840_SWITCH:
a832781c	70	v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
1da177e4 LT	71
	72	if (byte != TDA9840_SET_MONO
	73	&& byte != TDA9840_SET_MUTE
	74	&& byte != TDA9840_SET_STEREO
	75	&& byte != TDA9840_SET_LANG1
	76	&& byte != TDA9840_SET_LANG2
	77	&& byte != TDA9840_SET_BOTH
	78	&& byte != TDA9840_SET_BOTH_R
	79	&& byte != TDA9840_SET_EXTERNAL) {
	80	return -EINVAL;
	81	}
	82
a832781c	83	tda9840_write(client, SWITCH, byte);
1da177e4 LT	84	break;
	85
	86	case TDA9840_LEVEL_ADJUST:
a832781c	87	v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
1da177e4 LT	88
	89	/* check for correct range */
	90	if (byte > 25 \|\| byte < -20)
	91	return -EINVAL;
	92
	93	/* calculate actual value to set, see specs, page 18 */
	94	byte /= 5;
	95	if (0 < byte)
	96	byte += 0x8;
	97	else
	98	byte = -byte;
a832781c	99	tda9840_write(client, LEVEL_ADJUST, byte);
1da177e4 LT	100	break;
	101
	102	case TDA9840_STEREO_ADJUST:
a832781c	103	v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
1da177e4 LT	104
	105	/* check for correct range */
	106	if (byte > 25 \|\| byte < -24)
	107	return -EINVAL;
	108
	109	/* calculate actual value to set */
	110	byte /= 5;
	111	if (0 < byte)
	112	byte += 0x20;
	113	else
	114	byte = -byte;
	115
a832781c	116	tda9840_write(client, STEREO_ADJUST, byte);
1da177e4 LT	117	break;
	118
	119	case TDA9840_DETECT: {
	120	int ret = (int )arg;
	121
	122	byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
	123	if (byte == -1) {
a832781c HV	124	v4l_dbg(1, debug, client,
a832781c HV	125	"i2c_smbus_read_byte_data() failed\n");
1da177e4 LT	126	return -EIO;
	127	}
	128
a832781c HV	129	if (byte & 0x80) {
	130	v4l_dbg(1, debug, client,
	131	"TDA9840_DETECT: register contents invalid\n");
1da177e4 LT	132	return -EINVAL;
	133	}
	134
a832781c HV	135	v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
a832781c HV	136	*ret = (byte & 0x60) >> 5;
1da177e4 LT	137	result = 0;
	138	break;
	139	}
	140	case TDA9840_TEST:
a832781c	141	v4l_dbg(1, debug, client, "TDA9840_TEST: 0x%02x\n", byte);
1da177e4 LT	142
	143	/* mask out irrelevant bits */
	144	byte &= 0x3;
	145
a832781c	146	tda9840_write(client, TEST, byte);
1da177e4 LT	147	break;
	148	default:
	149	return -ENOIOCTLCMD;
	150	}
	151
	152	if (result)
	153	return -EIO;
	154
	155	return 0;
	156	}
	157
a832781c HV	158	static int tda9840_probe(struct i2c_client *client,
a832781c HV	159	const struct i2c_device_id *id)
1da177e4	160	{
a832781c HV	161	int result;
a832781c HV	162	int byte;
1da177e4 LT	163
1da177e4 LT	164	/* let's see whether this adapter can support what we need */
a832781c HV	165	if (!i2c_check_functionality(client->adapter,
	166	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	167	I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
1da177e4	168	return 0;
1da177e4	169
a832781c HV	170	v4l_info(client, "chip found @ 0x%x (%s)\n",
a832781c HV	171	client->addr << 1, client->adapter->name);
1da177e4 LT	172
	173	/* set initial values for level & stereo - adjustment, mode */
	174	byte = 0;
a832781c HV	175	result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
a832781c HV	176	result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
1da177e4	177	byte = TDA9840_SET_MONO;
a832781c	178	result = tda9840_command(client, TDA9840_SWITCH, &byte);
1da177e4	179	if (result) {
a832781c	180	v4l_dbg(1, debug, client, "could not initialize tda9840\n");
1da177e4 LT	181	return -ENODEV;
1da177e4 LT	182	}
1da177e4 LT	183	return 0;
	184	}
	185
a832781c	186	static int tda9840_legacy_probe(struct i2c_adapter *adapter)
1da177e4	187	{
a832781c HV	188	/* Let's see whether this is a known adapter we can attach to.
	189	Prevents conflicts with tvaudio.c. */
	190	return adapter->id == I2C_HW_SAA7146;
1da177e4	191	}
a832781c HV	192	static const struct i2c_device_id tda9840_id[] = {
	193	{ "tda9840", 0 },
	194	{ }
1da177e4	195	};
a832781c	196	MODULE_DEVICE_TABLE(i2c, tda9840_id);
1da177e4	197
a832781c	198	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
fae91e72	199	.name = "tda9840",
a832781c HV	200	.driverid = I2C_DRIVERID_TDA9840,
	201	.command = tda9840_command,
	202	.probe = tda9840_probe,
	203	.legacy_probe = tda9840_legacy_probe,
	204	.id_table = tda9840_id,
1da177e4	205	};