[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/slab.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.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


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 int tda9840_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_TDA9840, 0);
}

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

static const struct v4l2_subdev_core_ops tda9840_core_ops = {
	.g_chip_ident = tda9840_g_chip_ident,
};

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;

	/* 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 */
	tda9840_write(sd, LEVEL_ADJUST, 0);
	tda9840_write(sd, STEREO_ADJUST, 0);
	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
	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 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",
	.probe = tda9840_probe,
	.remove = tda9840_remove,
	.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>
1da177e4 LT	30	#include <linux/ioctl.h>
5a0e3ad6	31	#include <linux/slab.h>
1da177e4	32	#include <linux/i2c.h>
973909e8	33	#include <media/v4l2-device.h>
1b8dac15 HV	34	#include <media/v4l2-chip-ident.h>
1b8dac15 HV	35	#include <media/v4l2-i2c-drv.h>
1da177e4	36
a832781c HV	37	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	38	MODULE_DESCRIPTION("tda9840 driver");
	39	MODULE_LICENSE("GPL");
	40
	41	static int debug;
1da177e4	42	module_param(debug, int, 0644);
f87086e3	43
a832781c	44	MODULE_PARM_DESC(debug, "Debug level (0-1)");
1da177e4 LT	45
	46	#define SWITCH 0x00
	47	#define LEVEL_ADJUST 0x02
	48	#define STEREO_ADJUST 0x03
	49	#define TEST 0x04
	50
707ecf46 HV	51	#define TDA9840_SET_MUTE 0x00
	52	#define TDA9840_SET_MONO 0x10
	53	#define TDA9840_SET_STEREO 0x2a
	54	#define TDA9840_SET_LANG1 0x12
	55	#define TDA9840_SET_LANG2 0x1e
	56	#define TDA9840_SET_BOTH 0x1a
	57	#define TDA9840_SET_BOTH_R 0x16
	58	#define TDA9840_SET_EXTERNAL 0x7a
	59
1da177e4	60
973909e8	61	static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
a832781c	62	{
973909e8 HV	63	struct i2c_client *client = v4l2_get_subdevdata(sd);
973909e8 HV	64
a832781c	65	if (i2c_smbus_write_byte_data(client, reg, val))
973909e8	66	v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
a832781c HV	67	val, reg);
a832781c HV	68	}
1da177e4	69
973909e8	70	static int tda9840_s_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
1da177e4	71	{
973909e8	72	int byte;
707ecf46	73
973909e8 HV	74	if (t->index)
973909e8 HV	75	return -EINVAL;
707ecf46	76
973909e8 HV	77	switch (t->audmode) {
	78	case V4L2_TUNER_MODE_STEREO:
	79	byte = TDA9840_SET_STEREO;
707ecf46	80	break;
973909e8 HV	81	case V4L2_TUNER_MODE_LANG1_LANG2:
	82	byte = TDA9840_SET_BOTH;
	83	break;
	84	case V4L2_TUNER_MODE_LANG1:
	85	byte = TDA9840_SET_LANG1;
	86	break;
	87	case V4L2_TUNER_MODE_LANG2:
	88	byte = TDA9840_SET_LANG2;
	89	break;
	90	default:
	91	byte = TDA9840_SET_MONO;
	92	break;
	93	}
	94	v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
	95	tda9840_write(sd, SWITCH, byte);
	96	return 0;
	97	}
	98
	99	static int tda9840_g_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
	100	{
	101	struct i2c_client *client = v4l2_get_subdevdata(sd);
	102	u8 byte;
	103
	104	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	105	if (1 != i2c_master_recv(client, &byte, 1)) {
	106	v4l2_dbg(1, debug, sd,
	107	"i2c_master_recv() failed\n");
	108	return -EIO;
	109	}
	110
	111	if (byte & 0x80) {
	112	v4l2_dbg(1, debug, sd,
	113	"TDA9840_DETECT: register contents invalid\n");
	114	return -EINVAL;
707ecf46 HV	115	}
707ecf46 HV	116
973909e8	117	v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
1da177e4	118
973909e8 HV	119	switch (byte & 0x60) {
973909e8 HV	120	case 0x00:
707ecf46	121	t->rxsubchans = V4L2_TUNER_SUB_MONO;
973909e8 HV	122	break;
	123	case 0x20:
	124	t->rxsubchans = V4L2_TUNER_SUB_LANG1 \| V4L2_TUNER_SUB_LANG2;
	125	break;
	126	case 0x40:
	127	t->rxsubchans = V4L2_TUNER_SUB_STEREO \| V4L2_TUNER_SUB_MONO;
	128	break;
	129	default: /* Incorrect detect */
	130	t->rxsubchans = V4L2_TUNER_MODE_MONO;
1da177e4	131	break;
707ecf46	132	}
973909e8 HV	133	return 0;
973909e8 HV	134	}
1da177e4	135
1b8dac15	136	static int tda9840_g_chip_ident(struct v4l2_subdev sd, struct v4l2_dbg_chip_ident chip)
973909e8	137	{
1b8dac15	138	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4	139
1b8dac15	140	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
973909e8 HV	141	}
	142
	143	/* ----------------------------------------------------------------------- */
	144
	145	static const struct v4l2_subdev_core_ops tda9840_core_ops = {
1b8dac15	146	.g_chip_ident = tda9840_g_chip_ident,
973909e8 HV	147	};
	148
	149	static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
	150	.s_tuner = tda9840_s_tuner,
	151	.g_tuner = tda9840_g_tuner,
	152	};
	153
	154	static const struct v4l2_subdev_ops tda9840_ops = {
	155	.core = &tda9840_core_ops,
	156	.tuner = &tda9840_tuner_ops,
	157	};
	158
	159	/* ----------------------------------------------------------------------- */
	160
a832781c HV	161	static int tda9840_probe(struct i2c_client *client,
a832781c HV	162	const struct i2c_device_id *id)
1da177e4	163	{
973909e8	164	struct v4l2_subdev *sd;
1da177e4 LT	165
1da177e4 LT	166	/* let's see whether this adapter can support what we need */
a832781c HV	167	if (!i2c_check_functionality(client->adapter,
	168	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	169	I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
973909e8	170	return -EIO;
1da177e4	171
a832781c HV	172	v4l_info(client, "chip found @ 0x%x (%s)\n",
a832781c HV	173	client->addr << 1, client->adapter->name);
1da177e4	174
973909e8 HV	175	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	176	if (sd == NULL)
	177	return -ENOMEM;
	178	v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
	179
1da177e4	180	/* set initial values for level & stereo - adjustment, mode */
1b8dac15 HV	181	tda9840_write(sd, LEVEL_ADJUST, 0);
1b8dac15 HV	182	tda9840_write(sd, STEREO_ADJUST, 0);
973909e8	183	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
1da177e4 LT	184	return 0;
	185	}
	186
973909e8 HV	187	static int tda9840_remove(struct i2c_client *client)
	188	{
	189	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	190
	191	v4l2_device_unregister_subdev(sd);
	192	kfree(sd);
	193	return 0;
	194	}
	195
a832781c HV	196	static const struct i2c_device_id tda9840_id[] = {
	197	{ "tda9840", 0 },
	198	{ }
1da177e4	199	};
a832781c	200	MODULE_DEVICE_TABLE(i2c, tda9840_id);
1da177e4	201
a832781c	202	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
fae91e72	203	.name = "tda9840",
a832781c	204	.probe = tda9840_probe,
973909e8	205	.remove = tda9840_remove,
a832781c	206	.id_table = tda9840_id,
1da177e4	207	};