[deliverable/linux.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

#define TDA9840_SET_MUTE                0x00
#define TDA9840_SET_MONO                0x10
#define TDA9840_SET_STEREO              0x2a
#define TDA9840_SET_LANG1               0x12
#define TDA9840_SET_LANG2               0x1e
#define TDA9840_SET_BOTH                0x1a
#define TDA9840_SET_BOTH_R              0x16
#define TDA9840_SET_EXTERNAL            0x7a

/* 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 = 0;
	int byte = *(int *)arg;

	switch (cmd) {
	case VIDIOC_S_TUNER: {
		struct v4l2_tuner *t = arg;
		int byte;

		if (t->index)
			return -EINVAL;

		switch (t->audmode) {
		case V4L2_TUNER_MODE_STEREO:
			byte = TDA9840_SET_STEREO;
			break;
		case V4L2_TUNER_MODE_LANG1_LANG2:
			byte = TDA9840_SET_BOTH;
			break;
		case V4L2_TUNER_MODE_LANG1:
			byte = TDA9840_SET_LANG1;
			break;
		case V4L2_TUNER_MODE_LANG2:
			byte = TDA9840_SET_LANG2;
			break;
		default:
			byte = TDA9840_SET_MONO;
			break;
		}
		v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
		tda9840_write(client, SWITCH, byte);
		break;
	}

	case VIDIOC_G_TUNER: {
		struct v4l2_tuner *t = arg;
		u8 byte;

		t->rxsubchans = V4L2_TUNER_SUB_MONO;
		if (1 != i2c_master_recv(client, &byte, 1)) {
			v4l_dbg(1, debug, client,
				"i2c_master_recv() 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);

		switch (byte & 0x60) {
		case 0x00:
			t->rxsubchans = V4L2_TUNER_SUB_MONO;
			break;
		case 0x20:
			t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
			break;
		case 0x40:
			t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
			break;
		default: /* Incorrect detect */
			t->rxsubchans = V4L2_TUNER_MODE_MONO;
			break;
		}
		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;
	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);
	tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
	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
707ecf46 HV	50	#define TDA9840_SET_MUTE 0x00
	51	#define TDA9840_SET_MONO 0x10
	52	#define TDA9840_SET_STEREO 0x2a
	53	#define TDA9840_SET_LANG1 0x12
	54	#define TDA9840_SET_LANG2 0x1e
	55	#define TDA9840_SET_BOTH 0x1a
	56	#define TDA9840_SET_BOTH_R 0x16
	57	#define TDA9840_SET_EXTERNAL 0x7a
	58
1da177e4	59	/* addresses to scan, found only at 0x42 (7-Bit) */
09df1c16	60	static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
1da177e4 LT	61
	62	/* magic definition of all other variables and things */
	63	I2C_CLIENT_INSMOD;
	64
a832781c HV	65	static void tda9840_write(struct i2c_client *client, u8 reg, u8 val)
	66	{
	67	if (i2c_smbus_write_byte_data(client, reg, val))
	68	v4l_dbg(1, debug, client, "error writing %02x to %02x\n",
	69	val, reg);
	70	}
1da177e4	71
a832781c	72	static int tda9840_command(struct i2c_client client, unsigned cmd, void arg)
1da177e4	73	{
707ecf46	74	int result = 0;
1da177e4 LT	75	int byte = (int )arg;
	76
	77	switch (cmd) {
707ecf46 HV	78	case VIDIOC_S_TUNER: {
	79	struct v4l2_tuner *t = arg;
	80	int byte;
	81
	82	if (t->index)
	83	return -EINVAL;
	84
	85	switch (t->audmode) {
	86	case V4L2_TUNER_MODE_STEREO:
	87	byte = TDA9840_SET_STEREO;
	88	break;
	89	case V4L2_TUNER_MODE_LANG1_LANG2:
	90	byte = TDA9840_SET_BOTH;
	91	break;
	92	case V4L2_TUNER_MODE_LANG1:
	93	byte = TDA9840_SET_LANG1;
	94	break;
	95	case V4L2_TUNER_MODE_LANG2:
	96	byte = TDA9840_SET_LANG2;
	97	break;
	98	default:
	99	byte = TDA9840_SET_MONO;
	100	break;
	101	}
a832781c	102	v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
707ecf46 HV	103	tda9840_write(client, SWITCH, byte);
	104	break;
	105	}
	106
	107	case VIDIOC_G_TUNER: {
	108	struct v4l2_tuner *t = arg;
	109	u8 byte;
1da177e4	110
707ecf46 HV	111	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	112	if (1 != i2c_master_recv(client, &byte, 1)) {
	113	v4l_dbg(1, debug, client,
	114	"i2c_master_recv() failed\n");
	115	return -EIO;
	116	}
	117
	118	if (byte & 0x80) {
	119	v4l_dbg(1, debug, client,
	120	"TDA9840_DETECT: register contents invalid\n");
1da177e4 LT	121	return -EINVAL;
	122	}
	123
707ecf46 HV	124	v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
	125
	126	switch (byte & 0x60) {
	127	case 0x00:
	128	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	129	break;
	130	case 0x20:
	131	t->rxsubchans = V4L2_TUNER_SUB_LANG1 \| V4L2_TUNER_SUB_LANG2;
	132	break;
	133	case 0x40:
	134	t->rxsubchans = V4L2_TUNER_SUB_STEREO \| V4L2_TUNER_SUB_MONO;
	135	break;
	136	default: /* Incorrect detect */
	137	t->rxsubchans = V4L2_TUNER_MODE_MONO;
	138	break;
	139	}
1da177e4	140	break;
707ecf46	141	}
1da177e4 LT	142
1da177e4 LT	143	case TDA9840_LEVEL_ADJUST:
a832781c	144	v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
1da177e4 LT	145
	146	/* check for correct range */
	147	if (byte > 25 \|\| byte < -20)
	148	return -EINVAL;
	149
	150	/* calculate actual value to set, see specs, page 18 */
	151	byte /= 5;
	152	if (0 < byte)
	153	byte += 0x8;
	154	else
	155	byte = -byte;
a832781c	156	tda9840_write(client, LEVEL_ADJUST, byte);
1da177e4 LT	157	break;
	158
	159	case TDA9840_STEREO_ADJUST:
a832781c	160	v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
1da177e4 LT	161
	162	/* check for correct range */
	163	if (byte > 25 \|\| byte < -24)
	164	return -EINVAL;
	165
	166	/* calculate actual value to set */
	167	byte /= 5;
	168	if (0 < byte)
	169	byte += 0x20;
	170	else
	171	byte = -byte;
	172
a832781c	173	tda9840_write(client, STEREO_ADJUST, byte);
1da177e4	174	break;
1da177e4 LT	175	default:
	176	return -ENOIOCTLCMD;
	177	}
	178
	179	if (result)
	180	return -EIO;
	181
	182	return 0;
	183	}
	184
a832781c HV	185	static int tda9840_probe(struct i2c_client *client,
a832781c HV	186	const struct i2c_device_id *id)
1da177e4	187	{
a832781c HV	188	int result;
a832781c HV	189	int byte;
1da177e4 LT	190
1da177e4 LT	191	/* let's see whether this adapter can support what we need */
a832781c HV	192	if (!i2c_check_functionality(client->adapter,
	193	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	194	I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
1da177e4	195	return 0;
1da177e4	196
a832781c HV	197	v4l_info(client, "chip found @ 0x%x (%s)\n",
a832781c HV	198	client->addr << 1, client->adapter->name);
1da177e4 LT	199
	200	/* set initial values for level & stereo - adjustment, mode */
	201	byte = 0;
a832781c HV	202	result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
a832781c HV	203	result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
707ecf46	204	tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
1da177e4	205	if (result) {
a832781c	206	v4l_dbg(1, debug, client, "could not initialize tda9840\n");
1da177e4 LT	207	return -ENODEV;
1da177e4 LT	208	}
1da177e4 LT	209	return 0;
	210	}
	211
a832781c	212	static int tda9840_legacy_probe(struct i2c_adapter *adapter)
1da177e4	213	{
a832781c HV	214	/* Let's see whether this is a known adapter we can attach to.
	215	Prevents conflicts with tvaudio.c. */
	216	return adapter->id == I2C_HW_SAA7146;
1da177e4	217	}
a832781c HV	218	static const struct i2c_device_id tda9840_id[] = {
	219	{ "tda9840", 0 },
	220	{ }
1da177e4	221	};
a832781c	222	MODULE_DEVICE_TABLE(i2c, tda9840_id);
1da177e4	223
a832781c	224	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
fae91e72	225	.name = "tda9840",
a832781c HV	226	.driverid = I2C_DRIVERID_TDA9840,
	227	.command = tda9840_command,
	228	.probe = tda9840_probe,
	229	.legacy_probe = tda9840_legacy_probe,
	230	.id_table = tda9840_id,
1da177e4	231	};