[net-next-2.6.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>

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 i2c_driver tda9840_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "tda9840",
	},
	.probe		= tda9840_probe,
	.remove		= tda9840_remove,
	.id_table	= tda9840_id,
};

static __init int init_tda9840(void)
{
	return i2c_add_driver(&tda9840_driver);
}

static __exit void exit_tda9840(void)
{
	i2c_del_driver(&tda9840_driver);
}

module_init(init_tda9840);
module_exit(exit_tda9840);
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	34	#include <media/v4l2-chip-ident.h>
1da177e4	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
973909e8	60	static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
a832781c	61	{
973909e8 HV	62	struct i2c_client *client = v4l2_get_subdevdata(sd);
973909e8 HV	63
a832781c	64	if (i2c_smbus_write_byte_data(client, reg, val))
973909e8	65	v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
a832781c HV	66	val, reg);
a832781c HV	67	}
1da177e4	68
973909e8	69	static int tda9840_s_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
1da177e4	70	{
973909e8	71	int byte;
707ecf46	72
973909e8 HV	73	if (t->index)
973909e8 HV	74	return -EINVAL;
707ecf46	75
973909e8 HV	76	switch (t->audmode) {
	77	case V4L2_TUNER_MODE_STEREO:
	78	byte = TDA9840_SET_STEREO;
707ecf46	79	break;
973909e8 HV	80	case V4L2_TUNER_MODE_LANG1_LANG2:
	81	byte = TDA9840_SET_BOTH;
	82	break;
	83	case V4L2_TUNER_MODE_LANG1:
	84	byte = TDA9840_SET_LANG1;
	85	break;
	86	case V4L2_TUNER_MODE_LANG2:
	87	byte = TDA9840_SET_LANG2;
	88	break;
	89	default:
	90	byte = TDA9840_SET_MONO;
	91	break;
	92	}
	93	v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
	94	tda9840_write(sd, SWITCH, byte);
	95	return 0;
	96	}
	97
	98	static int tda9840_g_tuner(struct v4l2_subdev sd, struct v4l2_tuner t)
	99	{
	100	struct i2c_client *client = v4l2_get_subdevdata(sd);
	101	u8 byte;
	102
	103	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	104	if (1 != i2c_master_recv(client, &byte, 1)) {
	105	v4l2_dbg(1, debug, sd,
	106	"i2c_master_recv() failed\n");
	107	return -EIO;
	108	}
	109
	110	if (byte & 0x80) {
	111	v4l2_dbg(1, debug, sd,
	112	"TDA9840_DETECT: register contents invalid\n");
	113	return -EINVAL;
707ecf46 HV	114	}
707ecf46 HV	115
973909e8	116	v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
1da177e4	117
973909e8 HV	118	switch (byte & 0x60) {
973909e8 HV	119	case 0x00:
707ecf46	120	t->rxsubchans = V4L2_TUNER_SUB_MONO;
973909e8 HV	121	break;
	122	case 0x20:
	123	t->rxsubchans = V4L2_TUNER_SUB_LANG1 \| V4L2_TUNER_SUB_LANG2;
	124	break;
	125	case 0x40:
	126	t->rxsubchans = V4L2_TUNER_SUB_STEREO \| V4L2_TUNER_SUB_MONO;
	127	break;
	128	default: /* Incorrect detect */
	129	t->rxsubchans = V4L2_TUNER_MODE_MONO;
1da177e4	130	break;
707ecf46	131	}
973909e8 HV	132	return 0;
973909e8 HV	133	}
1da177e4	134
1b8dac15	135	static int tda9840_g_chip_ident(struct v4l2_subdev sd, struct v4l2_dbg_chip_ident chip)
973909e8	136	{
1b8dac15	137	struct i2c_client *client = v4l2_get_subdevdata(sd);
1da177e4	138
1b8dac15	139	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
973909e8 HV	140	}
	141
	142	/* ----------------------------------------------------------------------- */
	143
	144	static const struct v4l2_subdev_core_ops tda9840_core_ops = {
1b8dac15	145	.g_chip_ident = tda9840_g_chip_ident,
973909e8 HV	146	};
	147
	148	static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
	149	.s_tuner = tda9840_s_tuner,
	150	.g_tuner = tda9840_g_tuner,
	151	};
	152
	153	static const struct v4l2_subdev_ops tda9840_ops = {
	154	.core = &tda9840_core_ops,
	155	.tuner = &tda9840_tuner_ops,
	156	};
	157
	158	/* ----------------------------------------------------------------------- */
	159
a832781c HV	160	static int tda9840_probe(struct i2c_client *client,
a832781c HV	161	const struct i2c_device_id *id)
1da177e4	162	{
973909e8	163	struct v4l2_subdev *sd;
1da177e4 LT	164
1da177e4 LT	165	/* let's see whether this adapter can support what we need */
a832781c HV	166	if (!i2c_check_functionality(client->adapter,
	167	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	168	I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
973909e8	169	return -EIO;
1da177e4	170
a832781c HV	171	v4l_info(client, "chip found @ 0x%x (%s)\n",
a832781c HV	172	client->addr << 1, client->adapter->name);
1da177e4	173
973909e8 HV	174	sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
	175	if (sd == NULL)
	176	return -ENOMEM;
	177	v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
	178
1da177e4	179	/* set initial values for level & stereo - adjustment, mode */
1b8dac15 HV	180	tda9840_write(sd, LEVEL_ADJUST, 0);
1b8dac15 HV	181	tda9840_write(sd, STEREO_ADJUST, 0);
973909e8	182	tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
1da177e4 LT	183	return 0;
	184	}
	185
973909e8 HV	186	static int tda9840_remove(struct i2c_client *client)
	187	{
	188	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	189
	190	v4l2_device_unregister_subdev(sd);
	191	kfree(sd);
	192	return 0;
	193	}
	194
a832781c HV	195	static const struct i2c_device_id tda9840_id[] = {
	196	{ "tda9840", 0 },
	197	{ }
1da177e4	198	};
a832781c	199	MODULE_DEVICE_TABLE(i2c, tda9840_id);
1da177e4	200
cb595b51 HV	201	static struct i2c_driver tda9840_driver = {
	202	.driver = {
	203	.owner = THIS_MODULE,
	204	.name = "tda9840",
	205	},
	206	.probe = tda9840_probe,
	207	.remove = tda9840_remove,
	208	.id_table = tda9840_id,
1da177e4	209	};
cb595b51 HV	210
	211	static __init int init_tda9840(void)
	212	{
	213	return i2c_add_driver(&tda9840_driver);
	214	}
	215
	216	static __exit void exit_tda9840(void)
	217	{
	218	i2c_del_driver(&tda9840_driver);
	219	}
	220
	221	module_init(init_tda9840);
	222	module_exit(exit_tda9840);