[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-device.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 v4l2_subdev *sd, u8 reg, u8 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (i2c_smbus_write_byte_data(client, reg, val))
		v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
				val, reg);
}

static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
{
	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;
	}
	v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
	tda9840_write(sd, SWITCH, byte);
	return 0;
}

static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	u8 byte;

	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	if (1 != i2c_master_recv(client, &byte, 1)) {
		v4l2_dbg(1, debug, sd,
			"i2c_master_recv() failed\n");
		return -EIO;
	}

	if (byte & 0x80) {
		v4l2_dbg(1, debug, sd,
			"TDA9840_DETECT: register contents invalid\n");
		return -EINVAL;
	}

	v4l2_dbg(1, debug, sd, "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;
	}
	return 0;
}

static long tda9840_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg)
{
	int byte;

	switch (cmd) {
	case TDA9840_LEVEL_ADJUST:
		byte = *(int *)arg;
		v4l2_dbg(1, debug, sd, "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(sd, LEVEL_ADJUST, byte);
		break;

	case TDA9840_STEREO_ADJUST:
		byte = *(int *)arg;
		v4l2_dbg(1, debug, sd, "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(sd, STEREO_ADJUST, byte);
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
}

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

static const struct v4l2_subdev_core_ops tda9840_core_ops = {
	.ioctl = tda9840_ioctl,
};

static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
	.s_tuner = tda9840_s_tuner,
	.g_tuner = tda9840_g_tuner,
};

static const struct v4l2_subdev_ops tda9840_ops = {
	.core = &tda9840_core_ops,
	.tuner = &tda9840_tuner_ops,
};

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

static int tda9840_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct v4l2_subdev *sd;
	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 -EIO;

	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, &tda9840_ops);

	/* set initial values for level & stereo - adjustment, mode */
	byte = 0;
	result = tda9840_ioctl(sd, TDA9840_LEVEL_ADJUST, &byte);
	result |= tda9840_ioctl(sd, TDA9840_STEREO_ADJUST, &byte);
	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
	if (result) {
		v4l2_dbg(1, debug, sd, "could not initialize tda9840\n");
		kfree(sd);
		return -ENODEV;
	}
	return 0;
}

static int tda9840_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(sd);
	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",
	.command = tda9840_command,
	.probe = tda9840_probe,
	.remove = tda9840_remove,
	.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>
973909e8	32	#include <media/v4l2-device.h>
a832781c	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
973909e8	65	static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
a832781c	66	{
973909e8 HV	67	struct i2c_client *client = v4l2_get_subdevdata(sd);
973909e8 HV	68
a832781c	69	if (i2c_smbus_write_byte_data(client, reg, val))
973909e8	70	v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
a832781c HV	71	val, reg);
a832781c HV	72	}
1da177e4	73
973909e8	74	static int tda9840_s_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
1da177e4	75	{
973909e8	76	int byte;
707ecf46	77
973909e8 HV	78	if (t->index)
973909e8 HV	79	return -EINVAL;
707ecf46	80
973909e8 HV	81	switch (t->audmode) {
	82	case V4L2_TUNER_MODE_STEREO:
	83	byte = TDA9840_SET_STEREO;
707ecf46	84	break;
973909e8 HV	85	case V4L2_TUNER_MODE_LANG1_LANG2:
	86	byte = TDA9840_SET_BOTH;
	87	break;
	88	case V4L2_TUNER_MODE_LANG1:
	89	byte = TDA9840_SET_LANG1;
	90	break;
	91	case V4L2_TUNER_MODE_LANG2:
	92	byte = TDA9840_SET_LANG2;
	93	break;
	94	default:
	95	byte = TDA9840_SET_MONO;
	96	break;
	97	}
	98	v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
	99	tda9840_write(sd, SWITCH, byte);
	100	return 0;
	101	}
	102
	103	static int tda9840_g_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
	104	{
	105	struct i2c_client *client = v4l2_get_subdevdata(sd);
	106	u8 byte;
	107
	108	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	109	if (1 != i2c_master_recv(client, &byte, 1)) {
	110	v4l2_dbg(1, debug, sd,
	111	"i2c_master_recv() failed\n");
	112	return -EIO;
	113	}
	114
	115	if (byte & 0x80) {
	116	v4l2_dbg(1, debug, sd,
	117	"TDA9840_DETECT: register contents invalid\n");
	118	return -EINVAL;
707ecf46 HV	119	}
707ecf46 HV	120
973909e8	121	v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
1da177e4	122
973909e8 HV	123	switch (byte & 0x60) {
973909e8 HV	124	case 0x00:
707ecf46	125	t->rxsubchans = V4L2_TUNER_SUB_MONO;
973909e8 HV	126	break;
	127	case 0x20:
	128	t->rxsubchans = V4L2_TUNER_SUB_LANG1 \| V4L2_TUNER_SUB_LANG2;
	129	break;
	130	case 0x40:
	131	t->rxsubchans = V4L2_TUNER_SUB_STEREO \| V4L2_TUNER_SUB_MONO;
	132	break;
	133	default: /* Incorrect detect */
	134	t->rxsubchans = V4L2_TUNER_MODE_MONO;
1da177e4	135	break;
707ecf46	136	}
973909e8 HV	137	return 0;
973909e8 HV	138	}
1da177e4	139
069b7479	140	static long tda9840_ioctl(struct v4l2_subdev sd, unsigned cmd, void arg)
973909e8 HV	141	{
	142	int byte;
	143
	144	switch (cmd) {
1da177e4	145	case TDA9840_LEVEL_ADJUST:
973909e8 HV	146	byte = (int )arg;
973909e8 HV	147	v4l2_dbg(1, debug, sd, "TDA9840_LEVEL_ADJUST: %d\n", byte);
1da177e4 LT	148
	149	/* check for correct range */
	150	if (byte > 25 \|\| byte < -20)
	151	return -EINVAL;
	152
	153	/* calculate actual value to set, see specs, page 18 */
	154	byte /= 5;
	155	if (0 < byte)
	156	byte += 0x8;
	157	else
	158	byte = -byte;
973909e8	159	tda9840_write(sd, LEVEL_ADJUST, byte);
1da177e4 LT	160	break;
	161
	162	case TDA9840_STEREO_ADJUST:
973909e8 HV	163	byte = (int )arg;
973909e8 HV	164	v4l2_dbg(1, debug, sd, "TDA9840_STEREO_ADJUST: %d\n", byte);
1da177e4 LT	165
	166	/* check for correct range */
	167	if (byte > 25 \|\| byte < -24)
	168	return -EINVAL;
	169
	170	/* calculate actual value to set */
	171	byte /= 5;
	172	if (0 < byte)
	173	byte += 0x20;
	174	else
	175	byte = -byte;
	176
973909e8	177	tda9840_write(sd, STEREO_ADJUST, byte);
1da177e4	178	break;
1da177e4 LT	179	default:
	180	return -ENOIOCTLCMD;
	181	}
1da177e4 LT	182	return 0;
	183	}
	184
973909e8 HV	185	static int tda9840_command(struct i2c_client client, unsigned cmd, void arg)
	186	{
	187	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
	188	}
	189
	190	/* ----------------------------------------------------------------------- */
	191
	192	static const struct v4l2_subdev_core_ops tda9840_core_ops = {
	193	.ioctl = tda9840_ioctl,
	194	};
	195
	196	static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
	197	.s_tuner = tda9840_s_tuner,
	198	.g_tuner = tda9840_g_tuner,
	199	};
	200
	201	static const struct v4l2_subdev_ops tda9840_ops = {
	202	.core = &tda9840_core_ops,
	203	.tuner = &tda9840_tuner_ops,
	204	};
	205
	206	/* ----------------------------------------------------------------------- */
	207
a832781c HV	208	static int tda9840_probe(struct i2c_client *client,
a832781c HV	209	const struct i2c_device_id *id)
1da177e4	210	{
973909e8	211	struct v4l2_subdev *sd;
a832781c HV	212	int result;
a832781c HV	213	int byte;
1da177e4 LT	214
1da177e4 LT	215	/* let's see whether this adapter can support what we need */
a832781c HV	216	if (!i2c_check_functionality(client->adapter,
	217	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	218	I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
973909e8	219	return -EIO;
1da177e4	220
a832781c HV	221	v4l_info(client, "chip found @ 0x%x (%s)\n",
a832781c HV	222	client->addr << 1, client->adapter->name);
1da177e4	223
973909e8 HV	224	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	225	if (sd == NULL)
	226	return -ENOMEM;
	227	v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
	228
1da177e4 LT	229	/* set initial values for level & stereo - adjustment, mode */
1da177e4 LT	230	byte = 0;
973909e8 HV	231	result = tda9840_ioctl(sd, TDA9840_LEVEL_ADJUST, &byte);
	232	result \|= tda9840_ioctl(sd, TDA9840_STEREO_ADJUST, &byte);
	233	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
1da177e4	234	if (result) {
973909e8 HV	235	v4l2_dbg(1, debug, sd, "could not initialize tda9840\n");
973909e8 HV	236	kfree(sd);
1da177e4 LT	237	return -ENODEV;
1da177e4 LT	238	}
1da177e4 LT	239	return 0;
	240	}
	241
973909e8 HV	242	static int tda9840_remove(struct i2c_client *client)
	243	{
	244	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	245
	246	v4l2_device_unregister_subdev(sd);
	247	kfree(sd);
	248	return 0;
	249	}
	250
a832781c	251	static int tda9840_legacy_probe(struct i2c_adapter *adapter)
1da177e4	252	{
a832781c HV	253	/* Let's see whether this is a known adapter we can attach to.
	254	Prevents conflicts with tvaudio.c. */
	255	return adapter->id == I2C_HW_SAA7146;
1da177e4	256	}
a832781c HV	257	static const struct i2c_device_id tda9840_id[] = {
	258	{ "tda9840", 0 },
	259	{ }
1da177e4	260	};
a832781c	261	MODULE_DEVICE_TABLE(i2c, tda9840_id);
1da177e4	262
a832781c	263	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
fae91e72	264	.name = "tda9840",
a832781c HV	265	.command = tda9840_command,
a832781c HV	266	.probe = tda9840_probe,
973909e8	267	.remove = tda9840_remove,
a832781c HV	268	.legacy_probe = tda9840_legacy_probe,
a832781c HV	269	.id_table = tda9840_id,
1da177e4	270	};