drivers/media/video/tda9840.c - maze/linux - Git at Google

  /*
     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 int 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",
 	.driverid = I2C_DRIVERID_TDA9840,
 	.command = tda9840_command,
 	.probe = tda9840_probe,
 	.remove = tda9840_remove,
 	.legacy_probe = tda9840_legacy_probe,
 	.id_table = tda9840_id,
 };
	/*
	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 int 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",
	.driverid = I2C_DRIVERID_TDA9840,
	.command = tda9840_command,
	.probe = tda9840_probe,
	.remove = tda9840_remove,
	.legacy_probe = tda9840_legacy_probe,
	.id_table = tda9840_id,
	};