drivers/media/video/adv7175.c - kernel/msm-4.9 - Gitiles

 /*
  *  adv7175 - adv7175a video encoder driver version 0.0.3
  *
  * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
  * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
  * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
  *    - some corrections for Pinnacle Systems Inc. DC10plus card.
  *
  * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
  *    - moved over to linux>=2.4.x i2c protocol (9/9/2002)
  *
  * 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/types.h>
 #include <linux/ioctl.h>
 #include <asm/uaccess.h>
 #include <linux/i2c.h>
 #include <linux/i2c-id.h>
 #include <linux/videodev.h>
 #include <linux/video_encoder.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-i2c-drv-legacy.h>

 MODULE_DESCRIPTION("Analog Devices ADV7175 video encoder driver");
 MODULE_AUTHOR("Dave Perks");
 MODULE_LICENSE("GPL");

 static int debug;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0-1)");

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

 struct adv7175 {
 	int norm;
 	int input;
 	int enable;
 	int bright;
 	int contrast;
 	int hue;
 	int sat;
 };

 #define   I2C_ADV7175        0xd4
 #define   I2C_ADV7176        0x54

 static char *inputs[] = { "pass_through", "play_back", "color_bar" };
 static char *norms[] = { "PAL", "NTSC", "SECAM->PAL (may not work!)" };

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

 static inline int adv7175_write(struct i2c_client *client, u8 reg, u8 value)
 {
 	return i2c_smbus_write_byte_data(client, reg, value);
 }

 static inline int adv7175_read(struct i2c_client *client, u8 reg)
 {
 	return i2c_smbus_read_byte_data(client, reg);
 }

 static int adv7175_write_block(struct i2c_client *client,
 		     const u8 *data, unsigned int len)
 {
 	int ret = -1;
 	u8 reg;

 	/* the adv7175 has an autoincrement function, use it if
 	 * the adapter understands raw I2C */
 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		/* do raw I2C, not smbus compatible */
 		u8 block_data[32];
 		int block_len;

 		while (len >= 2) {
 			block_len = 0;
 			block_data[block_len++] = reg = data[0];
 			do {
 				block_data[block_len++] = data[1];
 				reg++;
 				len -= 2;
 				data += 2;
 			} while (len >= 2 && data[0] == reg && block_len < 32);
 			ret = i2c_master_send(client, block_data, block_len);
 			if (ret < 0)
 				break;
 		}
 	} else {
 		/* do some slow I2C emulation kind of thing */
 		while (len >= 2) {
 			reg = *data++;
 			ret = adv7175_write(client, reg, *data++);
 			if (ret < 0)
 				break;
 			len -= 2;
 		}
 	}

 	return ret;
 }

 static void set_subcarrier_freq(struct i2c_client *client, int pass_through)
 {
 	/* for some reason pass_through NTSC needs
 	 * a different sub-carrier freq to remain stable. */
 	if (pass_through)
 		adv7175_write(client, 0x02, 0x00);
 	else
 		adv7175_write(client, 0x02, 0x55);

 	adv7175_write(client, 0x03, 0x55);
 	adv7175_write(client, 0x04, 0x55);
 	adv7175_write(client, 0x05, 0x25);
 }

 /* ----------------------------------------------------------------------- */
 /* Output filter:  S-Video  Composite */

 #define MR050       0x11	/* 0x09 */
 #define MR060       0x14	/* 0x0c */

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

 #define TR0MODE     0x46
 #define TR0RST	    0x80

 #define TR1CAPT	    0x80
 #define TR1PLAY	    0x00

 static const unsigned char init_common[] = {

 	0x00, MR050,		/* MR0, PAL enabled */
 	0x01, 0x00,		/* MR1 */
 	0x02, 0x0c,		/* subc. freq. */
 	0x03, 0x8c,		/* subc. freq. */
 	0x04, 0x79,		/* subc. freq. */
 	0x05, 0x26,		/* subc. freq. */
 	0x06, 0x40,		/* subc. phase */

 	0x07, TR0MODE,		/* TR0, 16bit */
 	0x08, 0x21,		/*  */
 	0x09, 0x00,		/*  */
 	0x0a, 0x00,		/*  */
 	0x0b, 0x00,		/*  */
 	0x0c, TR1CAPT,		/* TR1 */
 	0x0d, 0x4f,		/* MR2 */
 	0x0e, 0x00,		/*  */
 	0x0f, 0x00,		/*  */
 	0x10, 0x00,		/*  */
 	0x11, 0x00,		/*  */
 };

 static const unsigned char init_pal[] = {
 	0x00, MR050,		/* MR0, PAL enabled */
 	0x01, 0x00,		/* MR1 */
 	0x02, 0x0c,		/* subc. freq. */
 	0x03, 0x8c,		/* subc. freq. */
 	0x04, 0x79,		/* subc. freq. */
 	0x05, 0x26,		/* subc. freq. */
 	0x06, 0x40,		/* subc. phase */
 };

 static const unsigned char init_ntsc[] = {
 	0x00, MR060,		/* MR0, NTSC enabled */
 	0x01, 0x00,		/* MR1 */
 	0x02, 0x55,		/* subc. freq. */
 	0x03, 0x55,		/* subc. freq. */
 	0x04, 0x55,		/* subc. freq. */
 	0x05, 0x25,		/* subc. freq. */
 	0x06, 0x1a,		/* subc. phase */
 };

 static int adv7175_command(struct i2c_client *client, unsigned cmd, void *arg)
 {
 	struct adv7175 *encoder = i2c_get_clientdata(client);

 	switch (cmd) {
 	case 0:
 		/* This is just for testing!!! */
 		adv7175_write_block(client, init_common,
 				    sizeof(init_common));
 		adv7175_write(client, 0x07, TR0MODE | TR0RST);
 		adv7175_write(client, 0x07, TR0MODE);
 		break;

 	case ENCODER_GET_CAPABILITIES:
 	{
 		struct video_encoder_capability *cap = arg;

 		cap->flags = VIDEO_ENCODER_PAL |
 			     VIDEO_ENCODER_NTSC |
 			     VIDEO_ENCODER_SECAM; /* well, hacky */
 		cap->inputs = 2;
 		cap->outputs = 1;
 		break;
 	}

 	case ENCODER_SET_NORM:
 	{
 		int iarg = *(int *) arg;

 		switch (iarg) {
 		case VIDEO_MODE_NTSC:
 			adv7175_write_block(client, init_ntsc,
 					    sizeof(init_ntsc));
 			if (encoder->input == 0)
 				adv7175_write(client, 0x0d, 0x4f);	// Enable genlock
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			break;

 		case VIDEO_MODE_PAL:
 			adv7175_write_block(client, init_pal,
 					    sizeof(init_pal));
 			if (encoder->input == 0)
 				adv7175_write(client, 0x0d, 0x4f);	// Enable genlock
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			break;

 		case VIDEO_MODE_SECAM:	// WARNING! ADV7176 does not support SECAM.
 			/* This is an attempt to convert
 			 * SECAM->PAL (typically it does not work
 			 * due to genlock: when decoder is in SECAM
 			 * and encoder in in PAL the subcarrier can
 			 * not be syncronized with horizontal
 			 * quency) */
 			adv7175_write_block(client, init_pal,
 					    sizeof(init_pal));
 			if (encoder->input == 0)
 				adv7175_write(client, 0x0d, 0x49);	// Disable genlock
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			break;
 		default:
 			v4l_dbg(1, debug, client, "illegal norm: %d\n", iarg);
 			return -EINVAL;
 		}
 		v4l_dbg(1, debug, client, "switched to %s\n", norms[iarg]);
 		encoder->norm = iarg;
 		break;
 	}

 	case ENCODER_SET_INPUT:
 	{
 		int iarg = *(int *) arg;

 		/* RJ: *iarg = 0: input is from SAA7110
 		 *iarg = 1: input is from ZR36060
 		 *iarg = 2: color bar */

 		switch (iarg) {
 		case 0:
 			adv7175_write(client, 0x01, 0x00);

 			if (encoder->norm == VIDEO_MODE_NTSC)
 				set_subcarrier_freq(client, 1);

 			adv7175_write(client, 0x0c, TR1CAPT);	/* TR1 */
 			if (encoder->norm == VIDEO_MODE_SECAM)
 				adv7175_write(client, 0x0d, 0x49);	// Disable genlock
 			else
 				adv7175_write(client, 0x0d, 0x4f);	// Enable genlock
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			//udelay(10);
 			break;

 		case 1:
 			adv7175_write(client, 0x01, 0x00);

 			if (encoder->norm == VIDEO_MODE_NTSC)
 				set_subcarrier_freq(client, 0);

 			adv7175_write(client, 0x0c, TR1PLAY);	/* TR1 */
 			adv7175_write(client, 0x0d, 0x49);
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			/* udelay(10); */
 			break;

 		case 2:
 			adv7175_write(client, 0x01, 0x80);

 			if (encoder->norm == VIDEO_MODE_NTSC)
 				set_subcarrier_freq(client, 0);

 			adv7175_write(client, 0x0d, 0x49);
 			adv7175_write(client, 0x07, TR0MODE | TR0RST);
 			adv7175_write(client, 0x07, TR0MODE);
 			/* udelay(10); */
 			break;

 		default:
 			v4l_dbg(1, debug, client, "illegal input: %d\n", iarg);
 			return -EINVAL;
 		}
 		v4l_dbg(1, debug, client, "switched to %s\n", inputs[iarg]);
 		encoder->input = iarg;
 		break;
 	}

 	case ENCODER_SET_OUTPUT:
 	{
 		int *iarg = arg;

 		/* not much choice of outputs */
 		if (*iarg != 0)
 			return -EINVAL;
 		break;
 	}

 	case ENCODER_ENABLE_OUTPUT:
 	{
 		int *iarg = arg;

 		encoder->enable = !!*iarg;
 		break;
 	}

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

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

 /*
  * Generic i2c probe
  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
  */
 static unsigned short normal_i2c[] = {
 	I2C_ADV7175 >> 1, (I2C_ADV7175 >> 1) + 1,
 	I2C_ADV7176 >> 1, (I2C_ADV7176 >> 1) + 1,
 	I2C_CLIENT_END
 };

 I2C_CLIENT_INSMOD;

 static int adv7175_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int i;
 	struct adv7175 *encoder;

 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;

 	v4l_info(client, "chip found @ 0x%x (%s)\n",
 			client->addr << 1, client->adapter->name);

 	encoder = kzalloc(sizeof(struct adv7175), GFP_KERNEL);
 	if (encoder == NULL)
 		return -ENOMEM;
 	encoder->norm = VIDEO_MODE_PAL;
 	encoder->input = 0;
 	encoder->enable = 1;
 	i2c_set_clientdata(client, encoder);

 	i = adv7175_write_block(client, init_common, sizeof(init_common));
 	if (i >= 0) {
 		i = adv7175_write(client, 0x07, TR0MODE | TR0RST);
 		i = adv7175_write(client, 0x07, TR0MODE);
 		i = adv7175_read(client, 0x12);
 		v4l_dbg(1, debug, client, "revision %d\n", i & 1);
 	}
 	if (i < 0)
 		v4l_dbg(1, debug, client, "init error 0x%x\n", i);
 	return 0;
 }

 static int adv7175_remove(struct i2c_client *client)
 {
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

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

 static const struct i2c_device_id adv7175_id[] = {
 	{ "adv7175", 0 },
 	{ "adv7176", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adv7175_id);

 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 	.name = "adv7175",
 	.driverid = I2C_DRIVERID_ADV7175,
 	.command = adv7175_command,
 	.probe = adv7175_probe,
 	.remove = adv7175_remove,
 	.id_table = adv7175_id,
 };
	/*
	* adv7175 - adv7175a video encoder driver version 0.0.3
	*
	* Copyright (C) 1998 Dave Perks <dperks@ibm.net>
	* Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
	* Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
	* - some corrections for Pinnacle Systems Inc. DC10plus card.
	*
	* Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
	* - moved over to linux>=2.4.x i2c protocol (9/9/2002)
	*
	* 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/types.h>
	#include <linux/ioctl.h>
	#include <asm/uaccess.h>
	#include <linux/i2c.h>
	#include <linux/i2c-id.h>
	#include <linux/videodev.h>
	#include <linux/video_encoder.h>
	#include <media/v4l2-common.h>
	#include <media/v4l2-i2c-drv-legacy.h>

	MODULE_DESCRIPTION("Analog Devices ADV7175 video encoder driver");
	MODULE_AUTHOR("Dave Perks");
	MODULE_LICENSE("GPL");

	static int debug;
	module_param(debug, int, 0);
	MODULE_PARM_DESC(debug, "Debug level (0-1)");

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

	struct adv7175 {
	int norm;
	int input;
	int enable;
	int bright;
	int contrast;
	int hue;
	int sat;
	};

	#define I2C_ADV7175 0xd4
	#define I2C_ADV7176 0x54

	static char *inputs[] = { "pass_through", "play_back", "color_bar" };
	static char *norms[] = { "PAL", "NTSC", "SECAM->PAL (may not work!)" };

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

	static inline int adv7175_write(struct i2c_client *client, u8 reg, u8 value)
	{
	return i2c_smbus_write_byte_data(client, reg, value);
	}

	static inline int adv7175_read(struct i2c_client *client, u8 reg)
	{
	return i2c_smbus_read_byte_data(client, reg);
	}

	static int adv7175_write_block(struct i2c_client *client,
	const u8 *data, unsigned int len)
	{
	int ret = -1;
	u8 reg;

	/* the adv7175 has an autoincrement function, use it if
	* the adapter understands raw I2C */
	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	/* do raw I2C, not smbus compatible */
	u8 block_data[32];
	int block_len;

	while (len >= 2) {
	block_len = 0;
	block_data[block_len++] = reg = data[0];
	do {
	block_data[block_len++] = data[1];
	reg++;
	len -= 2;
	data += 2;
	} while (len >= 2 && data[0] == reg && block_len < 32);
	ret = i2c_master_send(client, block_data, block_len);
	if (ret < 0)
	break;
	}
	} else {
	/* do some slow I2C emulation kind of thing */
	while (len >= 2) {
	reg = *data++;
	ret = adv7175_write(client, reg, *data++);
	if (ret < 0)
	break;
	len -= 2;
	}
	}

	return ret;
	}

	static void set_subcarrier_freq(struct i2c_client *client, int pass_through)
	{
	/* for some reason pass_through NTSC needs
	* a different sub-carrier freq to remain stable. */
	if (pass_through)
	adv7175_write(client, 0x02, 0x00);
	else
	adv7175_write(client, 0x02, 0x55);

	adv7175_write(client, 0x03, 0x55);
	adv7175_write(client, 0x04, 0x55);
	adv7175_write(client, 0x05, 0x25);
	}

	/* ----------------------------------------------------------------------- */
	/* Output filter: S-Video Composite */

	#define MR050 0x11 /* 0x09 */
	#define MR060 0x14 /* 0x0c */

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

	#define TR0MODE 0x46
	#define TR0RST 0x80

	#define TR1CAPT 0x80
	#define TR1PLAY 0x00

	static const unsigned char init_common[] = {

	0x00, MR050, /* MR0, PAL enabled */
	0x01, 0x00, /* MR1 */
	0x02, 0x0c, /* subc. freq. */
	0x03, 0x8c, /* subc. freq. */
	0x04, 0x79, /* subc. freq. */
	0x05, 0x26, /* subc. freq. */
	0x06, 0x40, /* subc. phase */

	0x07, TR0MODE, /* TR0, 16bit */
	0x08, 0x21, /* */
	0x09, 0x00, /* */
	0x0a, 0x00, /* */
	0x0b, 0x00, /* */
	0x0c, TR1CAPT, /* TR1 */
	0x0d, 0x4f, /* MR2 */
	0x0e, 0x00, /* */
	0x0f, 0x00, /* */
	0x10, 0x00, /* */
	0x11, 0x00, /* */
	};

	static const unsigned char init_pal[] = {
	0x00, MR050, /* MR0, PAL enabled */
	0x01, 0x00, /* MR1 */
	0x02, 0x0c, /* subc. freq. */
	0x03, 0x8c, /* subc. freq. */
	0x04, 0x79, /* subc. freq. */
	0x05, 0x26, /* subc. freq. */
	0x06, 0x40, /* subc. phase */
	};

	static const unsigned char init_ntsc[] = {
	0x00, MR060, /* MR0, NTSC enabled */
	0x01, 0x00, /* MR1 */
	0x02, 0x55, /* subc. freq. */
	0x03, 0x55, /* subc. freq. */
	0x04, 0x55, /* subc. freq. */
	0x05, 0x25, /* subc. freq. */
	0x06, 0x1a, /* subc. phase */
	};

	static int adv7175_command(struct i2c_client client, unsigned cmd, void arg)
	{
	struct adv7175 *encoder = i2c_get_clientdata(client);

	switch (cmd) {
	case 0:
	/* This is just for testing!!! */
	adv7175_write_block(client, init_common,
	sizeof(init_common));
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	break;

	case ENCODER_GET_CAPABILITIES:
	{
	struct video_encoder_capability *cap = arg;

	cap->flags = VIDEO_ENCODER_PAL \|
	VIDEO_ENCODER_NTSC \|
	VIDEO_ENCODER_SECAM; /* well, hacky */
	cap->inputs = 2;
	cap->outputs = 1;
	break;
	}

	case ENCODER_SET_NORM:
	{
	int iarg = (int ) arg;

	switch (iarg) {
	case VIDEO_MODE_NTSC:
	adv7175_write_block(client, init_ntsc,
	sizeof(init_ntsc));
	if (encoder->input == 0)
	adv7175_write(client, 0x0d, 0x4f); // Enable genlock
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	break;

	case VIDEO_MODE_PAL:
	adv7175_write_block(client, init_pal,
	sizeof(init_pal));
	if (encoder->input == 0)
	adv7175_write(client, 0x0d, 0x4f); // Enable genlock
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	break;

	case VIDEO_MODE_SECAM: // WARNING! ADV7176 does not support SECAM.
	/* This is an attempt to convert
	* SECAM->PAL (typically it does not work
	* due to genlock: when decoder is in SECAM
	* and encoder in in PAL the subcarrier can
	* not be syncronized with horizontal
	* quency) */
	adv7175_write_block(client, init_pal,
	sizeof(init_pal));
	if (encoder->input == 0)
	adv7175_write(client, 0x0d, 0x49); // Disable genlock
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	break;
	default:
	v4l_dbg(1, debug, client, "illegal norm: %d\n", iarg);
	return -EINVAL;
	}
	v4l_dbg(1, debug, client, "switched to %s\n", norms[iarg]);
	encoder->norm = iarg;
	break;
	}

	case ENCODER_SET_INPUT:
	{
	int iarg = (int ) arg;

	/* RJ: *iarg = 0: input is from SAA7110
	*iarg = 1: input is from ZR36060
	iarg = 2: color bar /

	switch (iarg) {
	case 0:
	adv7175_write(client, 0x01, 0x00);

	if (encoder->norm == VIDEO_MODE_NTSC)
	set_subcarrier_freq(client, 1);

	adv7175_write(client, 0x0c, TR1CAPT); /* TR1 */
	if (encoder->norm == VIDEO_MODE_SECAM)
	adv7175_write(client, 0x0d, 0x49); // Disable genlock
	else
	adv7175_write(client, 0x0d, 0x4f); // Enable genlock
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	//udelay(10);
	break;

	case 1:
	adv7175_write(client, 0x01, 0x00);

	if (encoder->norm == VIDEO_MODE_NTSC)
	set_subcarrier_freq(client, 0);

	adv7175_write(client, 0x0c, TR1PLAY); /* TR1 */
	adv7175_write(client, 0x0d, 0x49);
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	/* udelay(10); */
	break;

	case 2:
	adv7175_write(client, 0x01, 0x80);

	if (encoder->norm == VIDEO_MODE_NTSC)
	set_subcarrier_freq(client, 0);

	adv7175_write(client, 0x0d, 0x49);
	adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	adv7175_write(client, 0x07, TR0MODE);
	/* udelay(10); */
	break;

	default:
	v4l_dbg(1, debug, client, "illegal input: %d\n", iarg);
	return -EINVAL;
	}
	v4l_dbg(1, debug, client, "switched to %s\n", inputs[iarg]);
	encoder->input = iarg;
	break;
	}

	case ENCODER_SET_OUTPUT:
	{
	int *iarg = arg;

	/* not much choice of outputs */
	if (*iarg != 0)
	return -EINVAL;
	break;
	}

	case ENCODER_ENABLE_OUTPUT:
	{
	int *iarg = arg;

	encoder->enable = !!*iarg;
	break;
	}

	default:
	return -EINVAL;
	}

	return 0;
	}

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

	/*
	* Generic i2c probe
	* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
	*/
	static unsigned short normal_i2c[] = {
	I2C_ADV7175 >> 1, (I2C_ADV7175 >> 1) + 1,
	I2C_ADV7176 >> 1, (I2C_ADV7176 >> 1) + 1,
	I2C_CLIENT_END
	};

	I2C_CLIENT_INSMOD;

	static int adv7175_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int i;
	struct adv7175 *encoder;

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	return -ENODEV;

	v4l_info(client, "chip found @ 0x%x (%s)\n",
	client->addr << 1, client->adapter->name);

	encoder = kzalloc(sizeof(struct adv7175), GFP_KERNEL);
	if (encoder == NULL)
	return -ENOMEM;
	encoder->norm = VIDEO_MODE_PAL;
	encoder->input = 0;
	encoder->enable = 1;
	i2c_set_clientdata(client, encoder);

	i = adv7175_write_block(client, init_common, sizeof(init_common));
	if (i >= 0) {
	i = adv7175_write(client, 0x07, TR0MODE \| TR0RST);
	i = adv7175_write(client, 0x07, TR0MODE);
	i = adv7175_read(client, 0x12);
	v4l_dbg(1, debug, client, "revision %d\n", i & 1);
	}
	if (i < 0)
	v4l_dbg(1, debug, client, "init error 0x%x\n", i);
	return 0;
	}

	static int adv7175_remove(struct i2c_client *client)
	{
	kfree(i2c_get_clientdata(client));
	return 0;
	}

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

	static const struct i2c_device_id adv7175_id[] = {
	{ "adv7175", 0 },
	{ "adv7176", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adv7175_id);

	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "adv7175",
	.driverid = I2C_DRIVERID_ADV7175,
	.command = adv7175_command,
	.probe = adv7175_probe,
	.remove = adv7175_remove,
	.id_table = adv7175_id,
	};