drivers/media/video/saa7191.c - LeafOS-Devices/android_kernel_samsung_universal7904 - Gitiles

 /*
  *  saa7191.c - Philips SAA7191 video decoder driver
  *
  *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
  *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  */

 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/slab.h>

 #include <linux/videodev.h>
 #include <linux/video_decoder.h>
 #include <linux/i2c.h>

 #include "saa7191.h"

 #define SAA7191_MODULE_VERSION "0.0.3"

 MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
 MODULE_VERSION(SAA7191_MODULE_VERSION);
 MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
 MODULE_LICENSE("GPL");

 struct saa7191 {
 	struct i2c_client *client;

 	/* the register values are stored here as the actual
 	 * I2C-registers are write-only */
 	unsigned char reg[25];

 	unsigned char norm;
 	unsigned char input;
 };

 static struct i2c_driver i2c_driver_saa7191;

 static const unsigned char initseq[] = {
 	0,	/* Subaddress */
 	0x50,	/* SAA7191_REG_IDEL */
 	0x30,	/* SAA7191_REG_HSYB */
 	0x00,	/* SAA7191_REG_HSYS */
 	0xe8,	/* SAA7191_REG_HCLB */
 	0xb6,	/* SAA7191_REG_HCLS */
 	0xf4,	/* SAA7191_REG_HPHI */
 	0x01,	/* SAA7191_REG_LUMA - chrominance trap active (CVBS) */
 	0x00,	/* SAA7191_REG_HUEC */
 	0xf8,	/* SAA7191_REG_CKTQ */
 	0xf8,	/* SAA7191_REG_CKTS */
 	0x90,	/* SAA7191_REG_PLSE */
 	0x90,	/* SAA7191_REG_SESE */
 	0x00,	/* SAA7191_REG_GAIN */
 	0x0c,	/* SAA7191_REG_STDC - not SECAM, slow time constant */
 	0x78,	/* SAA7191_REG_IOCK - chrominance from CVBS, GPSW1 & 2 off */
 	0x99,	/* SAA7191_REG_CTL3 - automatic field detection */
 	0x00,	/* SAA7191_REG_CTL4 */
 	0x2c,	/* SAA7191_REG_CHCV */
 	0x00,	/* unused */
 	0x00,	/* unused */
 	0x34,	/* SAA7191_REG_HS6B */
 	0x0a,	/* SAA7191_REG_HS6S */
 	0xf4,	/* SAA7191_REG_HC6B */
 	0xce,	/* SAA7191_REG_HC6S */
 	0xf4,	/* SAA7191_REG_HP6I */
 };

 /* SAA7191 register handling */

 static unsigned char saa7191_read_reg(struct i2c_client *client,
 				      unsigned char reg)
 {
 	return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
 }

 static int saa7191_read_status(struct i2c_client *client,
 			       unsigned char *value)
 {
 	int ret;

 	ret = i2c_master_recv(client, value, 1);
 	if (ret < 0) {
 		printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed");
 		return ret;
 	}

 	return 0;
 }


 static int saa7191_write_reg(struct i2c_client *client, unsigned char reg,
 			     unsigned char value)
 {

 	((struct saa7191 *)i2c_get_clientdata(client))->reg[reg] = value;
 	return i2c_smbus_write_byte_data(client, reg, value);
 }

 /* the first byte of data must be the first subaddress number (register) */
 static int saa7191_write_block(struct i2c_client *client,
 			       unsigned char length, unsigned char *data)
 {
 	int i;
 	int ret;

 	struct saa7191 *decoder = (struct saa7191 *)i2c_get_clientdata(client);
 	for (i = 0; i < (length - 1); i++) {
 		decoder->reg[data[0] + i] = data[i + 1];
 	}

 	ret = i2c_master_send(client, data, length);
 	if (ret < 0) {
 		printk(KERN_ERR "SAA7191: saa7191_write_block(): "
 		       "write failed");
 		return ret;
 	}

 	return 0;
 }

 /* Helper functions */

 static int saa7191_set_input(struct i2c_client *client, int input)
 {
 	unsigned char luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
 	unsigned char iock = saa7191_read_reg(client, SAA7191_REG_IOCK);
 	int err;

 	switch (input) {
 	case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
 		iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
 			  | SAA7191_IOCK_GPSW2);
 		/* Chrominance trap active */
 		luma &= ~SAA7191_LUMA_BYPS;
 		break;
 	case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
 		iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
 		/* Chrominance trap bypassed */
 		luma |= SAA7191_LUMA_BYPS;
 		break;
 	default:
 		return -EINVAL;
 	}

 	err = saa7191_write_reg(client, SAA7191_REG_LUMA, luma);
 	if (err)
 		return -EIO;
 	err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
 	if (err)
 		return -EIO;

 	return 0;
 }

 static int saa7191_set_norm(struct i2c_client *client, int norm)
 {
 	struct saa7191 *decoder = i2c_get_clientdata(client);
 	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
 	unsigned char ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
 	unsigned char chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
 	int err;

 	switch(norm) {
 	case SAA7191_NORM_AUTO: {
 		unsigned char status;

 		// does status depend on current norm ?
 		if (saa7191_read_status(client, &status))
 			return -EIO;

 		stdc &= ~SAA7191_STDC_SECS;
 		ctl3 &= ~SAA7191_CTL3_FSEL;
 		ctl3 |= SAA7191_CTL3_AUFD;
 		chcv = (status & SAA7191_STATUS_FIDT)
 			       ? SAA7191_CHCV_NTSC : SAA7191_CHCV_PAL;
 		break;
 	}
 	case SAA7191_NORM_PAL:
 		stdc &= ~SAA7191_STDC_SECS;
 		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 		chcv = SAA7191_CHCV_PAL;
 		break;
 	case SAA7191_NORM_NTSC:
 		stdc &= ~SAA7191_STDC_SECS;
 		ctl3 &= ~SAA7191_CTL3_AUFD;
 		ctl3 |= SAA7191_CTL3_FSEL;
 		chcv = SAA7191_CHCV_NTSC;
 		break;
 	case SAA7191_NORM_SECAM:
 		stdc |= SAA7191_STDC_SECS;
 		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
 		chcv = SAA7191_CHCV_PAL;
 		break;
 	default:
 		return -EINVAL;
 	}

 	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
 	if (err)
 		return -EIO;
 	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
 	if (err)
 		return -EIO;
 	err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
 	if (err)
 		return -EIO;

 	decoder->norm = norm;

 	return 0;
 }

 static int saa7191_get_controls(struct i2c_client *client,
 				struct saa7191_control *ctrl)
 {
 	unsigned char hue = saa7191_read_reg(client, SAA7191_REG_HUEC);
 	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);

 	if (hue < 0x80) {
 		hue += 0x80;
 	} else {
 		hue -= 0x80;
 	}
 	ctrl->hue = hue;

 	ctrl->vtrc = (stdc & SAA7191_STDC_VTRC)
 		? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

 	return 0;
 }

 static int saa7191_set_controls(struct i2c_client *client,
 				struct saa7191_control *ctrl)
 {
 	int err;

 	if (ctrl->hue >= 0) {
 		unsigned char hue = ctrl->hue & 0xff;
 		if (hue < 0x80) {
 			hue += 0x80;
 		} else {
 			hue -= 0x80;
 		}
 		err = saa7191_write_reg(client, SAA7191_REG_HUEC, hue);
 		if (err)
 			return -EIO;
 	}
 	if (ctrl->vtrc >= 0) {
 		unsigned char stdc =
 			saa7191_read_reg(client, SAA7191_REG_STDC);

 		if (ctrl->vtrc) {
 			stdc |= SAA7191_STDC_VTRC;
 		} else {
 			stdc &= ~SAA7191_STDC_VTRC;
 		}

 		err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
 		if (err)
 			return -EIO;
 	}

 	return 0;
 }

 /* I2C-interface */

 static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
 {
 	int err = 0;
 	struct saa7191 *decoder;
 	struct i2c_client *client;

 	printk(KERN_INFO "Philips SAA7191 driver version %s\n",
 	       SAA7191_MODULE_VERSION);

 	client = kmalloc(sizeof(*client), GFP_KERNEL);
 	if (!client)
 		return -ENOMEM;
 	decoder = kmalloc(sizeof(*decoder), GFP_KERNEL);
 	if (!decoder) {
 		err = -ENOMEM;
 		goto out_free_client;
 	}

 	memset(client, 0, sizeof(struct i2c_client));
 	memset(decoder, 0, sizeof(struct saa7191));

 	client->addr = addr;
 	client->adapter = adap;
 	client->driver = &i2c_driver_saa7191;
 	client->flags = 0;
 	strcpy(client->name, "saa7191 client");
 	i2c_set_clientdata(client, decoder);

 	decoder->client = client;

 	err = i2c_attach_client(client);
 	if (err)
 		goto out_free_decoder;

 	decoder->input = SAA7191_INPUT_COMPOSITE;
 	decoder->norm = SAA7191_NORM_AUTO;

 	err = saa7191_write_block(client, sizeof(initseq),
 				  (unsigned char *)initseq);
 	if (err) {
 		printk(KERN_ERR "SAA7191 initialization failed\n");
 		goto out_detach_client;
 	}

 	printk(KERN_INFO "SAA7191 initialized\n");

 	return 0;

 out_detach_client:
 	i2c_detach_client(client);
 out_free_decoder:
 	kfree(decoder);
 out_free_client:
 	kfree(client);
 	return err;
 }

 static int saa7191_probe(struct i2c_adapter *adap)
 {
 	/* Always connected to VINO */
 	if (adap->id == I2C_HW_SGI_VINO)
 		return saa7191_attach(adap, SAA7191_ADDR, 0);
 	/* Feel free to add probe here :-) */
 	return -ENODEV;
 }

 static int saa7191_detach(struct i2c_client *client)
 {
 	struct saa7191 *decoder = i2c_get_clientdata(client);

 	i2c_detach_client(client);
 	kfree(decoder);
 	kfree(client);
 	return 0;
 }

 static int saa7191_command(struct i2c_client *client, unsigned int cmd,
 			   void *arg)
 {
 	struct saa7191 *decoder = i2c_get_clientdata(client);

 	switch (cmd) {
 	case DECODER_GET_CAPABILITIES: {
 		struct video_decoder_capability *cap = arg;

 		cap->flags  = VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
 			      VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
 		cap->inputs = (client->adapter->id == I2C_HW_SGI_VINO) ? 2 : 1;
 		cap->outputs = 1;
 		break;
 	}
 	case DECODER_GET_STATUS: {
 		int *iarg = arg;
 		unsigned char status;
 		int res = 0;

 		if (saa7191_read_status(client, &status)) {
 			return -EIO;
 		}
 		if ((status & SAA7191_STATUS_HLCK) == 0)
 			res |= DECODER_STATUS_GOOD;
 		if (status & SAA7191_STATUS_CODE)
 			res |= DECODER_STATUS_COLOR;
 		switch (decoder->norm) {
 		case SAA7191_NORM_NTSC:
 			res |= DECODER_STATUS_NTSC;
 			break;
 		case SAA7191_NORM_PAL:
 			res |= DECODER_STATUS_PAL;
 			break;
 		case SAA7191_NORM_SECAM:
 			res |= DECODER_STATUS_SECAM;
 			break;
 		case SAA7191_NORM_AUTO:
 		default:
 			if (status & SAA7191_STATUS_FIDT)
 				res |= DECODER_STATUS_NTSC;
 			else
 				res |= DECODER_STATUS_PAL;
 			break;
 		}
 		*iarg = res;
 		break;
 	}
 	case DECODER_SET_NORM: {
 		int *iarg = arg;

 		switch (*iarg) {
 		case VIDEO_MODE_AUTO:
 			return saa7191_set_norm(client, SAA7191_NORM_AUTO);
 		case VIDEO_MODE_PAL:
 			return saa7191_set_norm(client, SAA7191_NORM_PAL);
 		case VIDEO_MODE_NTSC:
 			return saa7191_set_norm(client, SAA7191_NORM_NTSC);
 		case VIDEO_MODE_SECAM:
 			return saa7191_set_norm(client, SAA7191_NORM_SECAM);
 		default:
 			return -EINVAL;
 		}
 		break;
 	}
 	case DECODER_SET_INPUT:	{
 		int *iarg = arg;

 		switch (client->adapter->id) {
 		case I2C_HW_SGI_VINO:
 			return saa7191_set_input(client, *iarg);
 		default:
 			if (*iarg != 0)
 				return -EINVAL;
 		}
 		break;
 	}
 	case DECODER_SET_OUTPUT: {
 		int *iarg = arg;

 		/* not much choice of outputs */
 		if (*iarg != 0)
 			return -EINVAL;
 		break;
 	}
 	case DECODER_ENABLE_OUTPUT: {
 		/* Always enabled */
 		break;
 	}
 	case DECODER_SET_PICTURE: {
 		struct video_picture *pic = arg;
 		unsigned val;
 		int err;

 		val = (pic->hue >> 8) - 0x80;
 		err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
 		if (err)
 			return -EIO;
 		break;
 	}
 	case DECODER_SAA7191_GET_STATUS: {
 		struct saa7191_status *status = arg;
 		unsigned char status_reg;

 		if (saa7191_read_status(client, &status_reg))
 			return -EIO;
 		status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
 			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 		status->ntsc = (status_reg & SAA7191_STATUS_FIDT)
 			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
 		status->color = (status_reg & SAA7191_STATUS_CODE)
 			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

 		status->input = decoder->input;
 		status->norm = decoder->norm;
 	}
 	case DECODER_SAA7191_SET_NORM: {
 		int *norm = arg;
 		return saa7191_set_norm(client, *norm);
 	}
 	case DECODER_SAA7191_GET_CONTROLS: {
 		struct saa7191_control *ctrl = arg;
 		return saa7191_get_controls(client, ctrl);
 	}
 	case DECODER_SAA7191_SET_CONTROLS: {
 		struct saa7191_control *ctrl = arg;
 		return saa7191_set_controls(client, ctrl);
 	}
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static struct i2c_driver i2c_driver_saa7191 = {
 	.owner		= THIS_MODULE,
 	.name 		= "saa7191",
 	.id 		= I2C_DRIVERID_SAA7191,
 	.flags 		= I2C_DF_NOTIFY,
 	.attach_adapter = saa7191_probe,
 	.detach_client 	= saa7191_detach,
 	.command 	= saa7191_command
 };

 static int saa7191_init(void)
 {
 	return i2c_add_driver(&i2c_driver_saa7191);
 }

 static void saa7191_exit(void)
 {
 	i2c_del_driver(&i2c_driver_saa7191);
 }

 module_init(saa7191_init);
 module_exit(saa7191_exit);
	/*
	* saa7191.c - Philips SAA7191 video decoder driver
	*
	* Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
	* Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/major.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/sched.h>
	#include <linux/slab.h>

	#include <linux/videodev.h>
	#include <linux/video_decoder.h>
	#include <linux/i2c.h>

	#include "saa7191.h"

	#define SAA7191_MODULE_VERSION "0.0.3"

	MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
	MODULE_VERSION(SAA7191_MODULE_VERSION);
	MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
	MODULE_LICENSE("GPL");

	struct saa7191 {
	struct i2c_client *client;

	/* the register values are stored here as the actual
	* I2C-registers are write-only */
	unsigned char reg[25];

	unsigned char norm;
	unsigned char input;
	};

	static struct i2c_driver i2c_driver_saa7191;

	static const unsigned char initseq[] = {
	0, /* Subaddress */
	0x50, /* SAA7191_REG_IDEL */
	0x30, /* SAA7191_REG_HSYB */
	0x00, /* SAA7191_REG_HSYS */
	0xe8, /* SAA7191_REG_HCLB */
	0xb6, /* SAA7191_REG_HCLS */
	0xf4, /* SAA7191_REG_HPHI */
	0x01, /* SAA7191_REG_LUMA - chrominance trap active (CVBS) */
	0x00, /* SAA7191_REG_HUEC */
	0xf8, /* SAA7191_REG_CKTQ */
	0xf8, /* SAA7191_REG_CKTS */
	0x90, /* SAA7191_REG_PLSE */
	0x90, /* SAA7191_REG_SESE */
	0x00, /* SAA7191_REG_GAIN */
	0x0c, /* SAA7191_REG_STDC - not SECAM, slow time constant */
	0x78, /* SAA7191_REG_IOCK - chrominance from CVBS, GPSW1 & 2 off */
	0x99, /* SAA7191_REG_CTL3 - automatic field detection */
	0x00, /* SAA7191_REG_CTL4 */
	0x2c, /* SAA7191_REG_CHCV */
	0x00, /* unused */
	0x00, /* unused */
	0x34, /* SAA7191_REG_HS6B */
	0x0a, /* SAA7191_REG_HS6S */
	0xf4, /* SAA7191_REG_HC6B */
	0xce, /* SAA7191_REG_HC6S */
	0xf4, /* SAA7191_REG_HP6I */
	};

	/* SAA7191 register handling */

	static unsigned char saa7191_read_reg(struct i2c_client *client,
	unsigned char reg)
	{
	return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
	}

	static int saa7191_read_status(struct i2c_client *client,
	unsigned char *value)
	{
	int ret;

	ret = i2c_master_recv(client, value, 1);
	if (ret < 0) {
	printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed");
	return ret;
	}

	return 0;
	}


	static int saa7191_write_reg(struct i2c_client *client, unsigned char reg,
	unsigned char value)
	{

	((struct saa7191 *)i2c_get_clientdata(client))->reg[reg] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
	}

	/* the first byte of data must be the first subaddress number (register) */
	static int saa7191_write_block(struct i2c_client *client,
	unsigned char length, unsigned char *data)
	{
	int i;
	int ret;

	struct saa7191 decoder = (struct saa7191 )i2c_get_clientdata(client);
	for (i = 0; i < (length - 1); i++) {
	decoder->reg[data[0] + i] = data[i + 1];
	}

	ret = i2c_master_send(client, data, length);
	if (ret < 0) {
	printk(KERN_ERR "SAA7191: saa7191_write_block(): "
	"write failed");
	return ret;
	}

	return 0;
	}

	/* Helper functions */

	static int saa7191_set_input(struct i2c_client *client, int input)
	{
	unsigned char luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
	unsigned char iock = saa7191_read_reg(client, SAA7191_REG_IOCK);
	int err;

	switch (input) {
	case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
	iock &= ~(SAA7191_IOCK_CHRS \| SAA7191_IOCK_GPSW1
	\| SAA7191_IOCK_GPSW2);
	/* Chrominance trap active */
	luma &= ~SAA7191_LUMA_BYPS;
	break;
	case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
	iock \|= SAA7191_IOCK_CHRS \| SAA7191_IOCK_GPSW2;
	/* Chrominance trap bypassed */
	luma \|= SAA7191_LUMA_BYPS;
	break;
	default:
	return -EINVAL;
	}

	err = saa7191_write_reg(client, SAA7191_REG_LUMA, luma);
	if (err)
	return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
	if (err)
	return -EIO;

	return 0;
	}

	static int saa7191_set_norm(struct i2c_client *client, int norm)
	{
	struct saa7191 *decoder = i2c_get_clientdata(client);
	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
	unsigned char ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
	unsigned char chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
	int err;

	switch(norm) {
	case SAA7191_NORM_AUTO: {
	unsigned char status;

	// does status depend on current norm ?
	if (saa7191_read_status(client, &status))
	return -EIO;

	stdc &= ~SAA7191_STDC_SECS;
	ctl3 &= ~SAA7191_CTL3_FSEL;
	ctl3 \|= SAA7191_CTL3_AUFD;
	chcv = (status & SAA7191_STATUS_FIDT)
	? SAA7191_CHCV_NTSC : SAA7191_CHCV_PAL;
	break;
	}
	case SAA7191_NORM_PAL:
	stdc &= ~SAA7191_STDC_SECS;
	ctl3 &= ~(SAA7191_CTL3_AUFD \| SAA7191_CTL3_FSEL);
	chcv = SAA7191_CHCV_PAL;
	break;
	case SAA7191_NORM_NTSC:
	stdc &= ~SAA7191_STDC_SECS;
	ctl3 &= ~SAA7191_CTL3_AUFD;
	ctl3 \|= SAA7191_CTL3_FSEL;
	chcv = SAA7191_CHCV_NTSC;
	break;
	case SAA7191_NORM_SECAM:
	stdc \|= SAA7191_STDC_SECS;
	ctl3 &= ~(SAA7191_CTL3_AUFD \| SAA7191_CTL3_FSEL);
	chcv = SAA7191_CHCV_PAL;
	break;
	default:
	return -EINVAL;
	}

	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
	if (err)
	return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
	if (err)
	return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
	if (err)
	return -EIO;

	decoder->norm = norm;

	return 0;
	}

	static int saa7191_get_controls(struct i2c_client *client,
	struct saa7191_control *ctrl)
	{
	unsigned char hue = saa7191_read_reg(client, SAA7191_REG_HUEC);
	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);

	if (hue < 0x80) {
	hue += 0x80;
	} else {
	hue -= 0x80;
	}
	ctrl->hue = hue;

	ctrl->vtrc = (stdc & SAA7191_STDC_VTRC)
	? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

	return 0;
	}

	static int saa7191_set_controls(struct i2c_client *client,
	struct saa7191_control *ctrl)
	{
	int err;

	if (ctrl->hue >= 0) {
	unsigned char hue = ctrl->hue & 0xff;
	if (hue < 0x80) {
	hue += 0x80;
	} else {
	hue -= 0x80;
	}
	err = saa7191_write_reg(client, SAA7191_REG_HUEC, hue);
	if (err)
	return -EIO;
	}
	if (ctrl->vtrc >= 0) {
	unsigned char stdc =
	saa7191_read_reg(client, SAA7191_REG_STDC);

	if (ctrl->vtrc) {
	stdc \|= SAA7191_STDC_VTRC;
	} else {
	stdc &= ~SAA7191_STDC_VTRC;
	}

	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
	if (err)
	return -EIO;
	}

	return 0;
	}

	/* I2C-interface */

	static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
	{
	int err = 0;
	struct saa7191 *decoder;
	struct i2c_client *client;

	printk(KERN_INFO "Philips SAA7191 driver version %s\n",
	SAA7191_MODULE_VERSION);

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client)
	return -ENOMEM;
	decoder = kmalloc(sizeof(*decoder), GFP_KERNEL);
	if (!decoder) {
	err = -ENOMEM;
	goto out_free_client;
	}

	memset(client, 0, sizeof(struct i2c_client));
	memset(decoder, 0, sizeof(struct saa7191));

	client->addr = addr;
	client->adapter = adap;
	client->driver = &i2c_driver_saa7191;
	client->flags = 0;
	strcpy(client->name, "saa7191 client");
	i2c_set_clientdata(client, decoder);

	decoder->client = client;

	err = i2c_attach_client(client);
	if (err)
	goto out_free_decoder;

	decoder->input = SAA7191_INPUT_COMPOSITE;
	decoder->norm = SAA7191_NORM_AUTO;

	err = saa7191_write_block(client, sizeof(initseq),
	(unsigned char *)initseq);
	if (err) {
	printk(KERN_ERR "SAA7191 initialization failed\n");
	goto out_detach_client;
	}

	printk(KERN_INFO "SAA7191 initialized\n");

	return 0;

	out_detach_client:
	i2c_detach_client(client);
	out_free_decoder:
	kfree(decoder);
	out_free_client:
	kfree(client);
	return err;
	}

	static int saa7191_probe(struct i2c_adapter *adap)
	{
	/* Always connected to VINO */
	if (adap->id == I2C_HW_SGI_VINO)
	return saa7191_attach(adap, SAA7191_ADDR, 0);
	/* Feel free to add probe here :-) */
	return -ENODEV;
	}

	static int saa7191_detach(struct i2c_client *client)
	{
	struct saa7191 *decoder = i2c_get_clientdata(client);

	i2c_detach_client(client);
	kfree(decoder);
	kfree(client);
	return 0;
	}

	static int saa7191_command(struct i2c_client *client, unsigned int cmd,
	void *arg)
	{
	struct saa7191 *decoder = i2c_get_clientdata(client);

	switch (cmd) {
	case DECODER_GET_CAPABILITIES: {
	struct video_decoder_capability *cap = arg;

	cap->flags = VIDEO_DECODER_PAL \| VIDEO_DECODER_NTSC \|
	VIDEO_DECODER_SECAM \| VIDEO_DECODER_AUTO;
	cap->inputs = (client->adapter->id == I2C_HW_SGI_VINO) ? 2 : 1;
	cap->outputs = 1;
	break;
	}
	case DECODER_GET_STATUS: {
	int *iarg = arg;
	unsigned char status;
	int res = 0;

	if (saa7191_read_status(client, &status)) {
	return -EIO;
	}
	if ((status & SAA7191_STATUS_HLCK) == 0)
	res \|= DECODER_STATUS_GOOD;
	if (status & SAA7191_STATUS_CODE)
	res \|= DECODER_STATUS_COLOR;
	switch (decoder->norm) {
	case SAA7191_NORM_NTSC:
	res \|= DECODER_STATUS_NTSC;
	break;
	case SAA7191_NORM_PAL:
	res \|= DECODER_STATUS_PAL;
	break;
	case SAA7191_NORM_SECAM:
	res \|= DECODER_STATUS_SECAM;
	break;
	case SAA7191_NORM_AUTO:
	default:
	if (status & SAA7191_STATUS_FIDT)
	res \|= DECODER_STATUS_NTSC;
	else
	res \|= DECODER_STATUS_PAL;
	break;
	}
	*iarg = res;
	break;
	}
	case DECODER_SET_NORM: {
	int *iarg = arg;

	switch (*iarg) {
	case VIDEO_MODE_AUTO:
	return saa7191_set_norm(client, SAA7191_NORM_AUTO);
	case VIDEO_MODE_PAL:
	return saa7191_set_norm(client, SAA7191_NORM_PAL);
	case VIDEO_MODE_NTSC:
	return saa7191_set_norm(client, SAA7191_NORM_NTSC);
	case VIDEO_MODE_SECAM:
	return saa7191_set_norm(client, SAA7191_NORM_SECAM);
	default:
	return -EINVAL;
	}
	break;
	}
	case DECODER_SET_INPUT: {
	int *iarg = arg;

	switch (client->adapter->id) {
	case I2C_HW_SGI_VINO:
	return saa7191_set_input(client, *iarg);
	default:
	if (*iarg != 0)
	return -EINVAL;
	}
	break;
	}
	case DECODER_SET_OUTPUT: {
	int *iarg = arg;

	/* not much choice of outputs */
	if (*iarg != 0)
	return -EINVAL;
	break;
	}
	case DECODER_ENABLE_OUTPUT: {
	/* Always enabled */
	break;
	}
	case DECODER_SET_PICTURE: {
	struct video_picture *pic = arg;
	unsigned val;
	int err;

	val = (pic->hue >> 8) - 0x80;
	err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
	if (err)
	return -EIO;
	break;
	}
	case DECODER_SAA7191_GET_STATUS: {
	struct saa7191_status *status = arg;
	unsigned char status_reg;

	if (saa7191_read_status(client, &status_reg))
	return -EIO;
	status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
	? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
	status->ntsc = (status_reg & SAA7191_STATUS_FIDT)
	? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
	status->color = (status_reg & SAA7191_STATUS_CODE)
	? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

	status->input = decoder->input;
	status->norm = decoder->norm;
	}
	case DECODER_SAA7191_SET_NORM: {
	int *norm = arg;
	return saa7191_set_norm(client, *norm);
	}
	case DECODER_SAA7191_GET_CONTROLS: {
	struct saa7191_control *ctrl = arg;
	return saa7191_get_controls(client, ctrl);
	}
	case DECODER_SAA7191_SET_CONTROLS: {
	struct saa7191_control *ctrl = arg;
	return saa7191_set_controls(client, ctrl);
	}
	default:
	return -EINVAL;
	}

	return 0;
	}

	static struct i2c_driver i2c_driver_saa7191 = {
	.owner = THIS_MODULE,
	.name = "saa7191",
	.id = I2C_DRIVERID_SAA7191,
	.flags = I2C_DF_NOTIFY,
	.attach_adapter = saa7191_probe,
	.detach_client = saa7191_detach,
	.command = saa7191_command
	};

	static int saa7191_init(void)
	{
	return i2c_add_driver(&i2c_driver_saa7191);
	}

	static void saa7191_exit(void)
	{
	i2c_del_driver(&i2c_driver_saa7191);
	}

	module_init(saa7191_init);
	module_exit(saa7191_exit);