drivers/media/video/saa7191.c - kernel/msm-4.19 - 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/slab.h>

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

 #include "saa7191.h"

 #define SAA7191_MODULE_VERSION	"0.0.5"

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

 // #define SAA7191_DEBUG

 #ifdef SAA7191_DEBUG
 #define dprintk(x...) printk("SAA7191: " x);
 #else
 #define dprintk(x...)
 #endif

 #define SAA7191_SYNC_COUNT	30
 #define SAA7191_SYNC_DELAY	100	/* milliseconds */

 struct saa7191 {
 	struct i2c_client *client;

 	/* the register values are stored here as the actual
 	 * I2C-registers are write-only */
 	u8 reg[25];

 	int input;
 	int norm;
 };

 static struct i2c_driver i2c_driver_saa7191;

 static const u8 initseq[] = {
 	0,	/* Subaddress */

 	0x50,	/* (0x50) SAA7191_REG_IDEL */

 	/* 50 Hz signal timing */
 	0x30,	/* (0x30) SAA7191_REG_HSYB */
 	0x00,	/* (0x00) SAA7191_REG_HSYS */
 	0xe8,	/* (0xe8) SAA7191_REG_HCLB */
 	0xb6,	/* (0xb6) SAA7191_REG_HCLS */
 	0xf4,	/* (0xf4) SAA7191_REG_HPHI */

 	/* control */
 	SAA7191_LUMA_APER_1,	/* (0x01) SAA7191_REG_LUMA - CVBS mode */
 	0x00,	/* (0x00) SAA7191_REG_HUEC */
 	0xf8,	/* (0xf8) SAA7191_REG_CKTQ */
 	0xf8,	/* (0xf8) SAA7191_REG_CKTS */
 	0x90,	/* (0x90) SAA7191_REG_PLSE */
 	0x90,	/* (0x90) SAA7191_REG_SESE */
 	0x00,	/* (0x00) SAA7191_REG_GAIN */
 	SAA7191_STDC_NFEN | SAA7191_STDC_HRMV,	/* (0x0c) SAA7191_REG_STDC
 						 * - not SECAM,
 						 * slow time constant */
 	SAA7191_IOCK_OEDC | SAA7191_IOCK_OEHS | SAA7191_IOCK_OEVS
 	| SAA7191_IOCK_OEDY,	/* (0x78) SAA7191_REG_IOCK
 				 * - chroma from CVBS, GPSW1 & 2 off */
 	SAA7191_CTL3_AUFD | SAA7191_CTL3_SCEN | SAA7191_CTL3_OFTS
 	| SAA7191_CTL3_YDEL0,	/* (0x99) SAA7191_REG_CTL3
 				 * - automatic field detection */
 	0x00,	/* (0x00) SAA7191_REG_CTL4 */
 	0x2c,	/* (0x2c) SAA7191_REG_CHCV - PAL nominal value */
 	0x00,	/* unused */
 	0x00,	/* unused */

 	/* 60 Hz signal timing */
 	0x34,	/* (0x34) SAA7191_REG_HS6B */
 	0x0a,	/* (0x0a) SAA7191_REG_HS6S */
 	0xf4,	/* (0xf4) SAA7191_REG_HC6B */
 	0xce,	/* (0xce) SAA7191_REG_HC6S */
 	0xf4,	/* (0xf4) SAA7191_REG_HP6I */
 };

 /* SAA7191 register handling */

 static u8 saa7191_read_reg(struct i2c_client *client,
 			   u8 reg)
 {
 	return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
 }

 static int saa7191_read_status(struct i2c_client *client,
 			       u8 *value)
 {
 	int ret;

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

 	return 0;
 }


 static int saa7191_write_reg(struct i2c_client *client, u8 reg,
 			     u8 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,
 			       u8 length, const u8 *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\n");
 		return ret;
 	}

 	return 0;
 }

 /* Helper functions */

 static int saa7191_set_input(struct i2c_client *client, int input)
 {
 	struct saa7191 *decoder = i2c_get_clientdata(client);
 	u8 luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
 	u8 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;

 	decoder->input = input;

 	return 0;
 }

 static int saa7191_set_norm(struct i2c_client *client, int norm)
 {
 	struct saa7191 *decoder = i2c_get_clientdata(client);
 	u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
 	u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
 	u8 chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
 	int err;

 	switch(norm) {
 	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;

 	dprintk("ctl3: %02x stdc: %02x chcv: %02x\n", ctl3,
 		stdc, chcv);
 	dprintk("norm: %d\n", norm);

 	return 0;
 }

 static int saa7191_wait_for_signal(struct i2c_client *client, u8 *status)
 {
 	int i = 0;

 	dprintk("Checking for signal...\n");

 	for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
 		if (saa7191_read_status(client, status))
 			return -EIO;

 		if (((*status) & SAA7191_STATUS_HLCK) == 0) {
 			dprintk("Signal found\n");
 			return 0;
 		}

 		msleep(SAA7191_SYNC_DELAY);
 	}

 	dprintk("No signal\n");

 	return -EBUSY;
 }

 static int saa7191_autodetect_norm_extended(struct i2c_client *client)
 {
 	u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
 	u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
 	u8 status;
 	int err = 0;

 	dprintk("SAA7191 extended signal auto-detection...\n");

 	stdc &= ~SAA7191_STDC_SECS;
 	ctl3 &= ~(SAA7191_CTL3_FSEL);

 	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
 	if (err) {
 		err = -EIO;
 		goto out;
 	}
 	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
 	if (err) {
 		err = -EIO;
 		goto out;
 	}

 	ctl3 |= SAA7191_CTL3_AUFD;
 	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
 	if (err) {
 		err = -EIO;
 		goto out;
 	}

 	msleep(SAA7191_SYNC_DELAY);

 	err = saa7191_wait_for_signal(client, &status);
 	if (err)
 		goto out;

 	if (status & SAA7191_STATUS_FIDT) {
 		/* 60Hz signal -> NTSC */
 		dprintk("60Hz signal: NTSC\n");
 		return saa7191_set_norm(client, SAA7191_NORM_NTSC);
 	}

 	/* 50Hz signal */
 	dprintk("50Hz signal: Trying PAL...\n");

 	/* try PAL first */
 	err = saa7191_set_norm(client, SAA7191_NORM_PAL);
 	if (err)
 		goto out;

 	msleep(SAA7191_SYNC_DELAY);

 	err = saa7191_wait_for_signal(client, &status);
 	if (err)
 		goto out;

 	/* not 50Hz ? */
 	if (status & SAA7191_STATUS_FIDT) {
 		dprintk("No 50Hz signal\n");
 		err = -EAGAIN;
 		goto out;
 	}

 	if (status & SAA7191_STATUS_CODE) {
 		dprintk("PAL\n");
 		return 0;
 	}

 	dprintk("No color detected with PAL - Trying SECAM...\n");

 	/* no color detected ? -> try SECAM */
 	err = saa7191_set_norm(client,
 			       SAA7191_NORM_SECAM);
 	if (err)
 		goto out;

 	msleep(SAA7191_SYNC_DELAY);

 	err = saa7191_wait_for_signal(client, &status);
 	if (err)
 		goto out;

 	/* not 50Hz ? */
 	if (status & SAA7191_STATUS_FIDT) {
 		dprintk("No 50Hz signal\n");
 		err = -EAGAIN;
 		goto out;
 	}

 	if (status & SAA7191_STATUS_CODE) {
 		/* Color detected -> SECAM */
 		dprintk("SECAM\n");
 		return 0;
 	}

 	dprintk("No color detected with SECAM - Going back to PAL.\n");

 	/* still no color detected ?
 	 * -> set norm back to PAL */
 	err = saa7191_set_norm(client,
 			       SAA7191_NORM_PAL);
 	if (err)
 		goto out;

 out:
 	ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
 	if (ctl3 & SAA7191_CTL3_AUFD) {
 		ctl3 &= ~(SAA7191_CTL3_AUFD);
 		err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
 		if (err) {
 			err = -EIO;
 		}
 	}

 	return err;
 }

 static int saa7191_autodetect_norm(struct i2c_client *client)
 {
 	u8 status;

 	dprintk("SAA7191 signal auto-detection...\n");

 	dprintk("Reading status...\n");

 	if (saa7191_read_status(client, &status))
 		return -EIO;

 	dprintk("Checking for signal...\n");

 	/* no signal ? */
 	if (status & SAA7191_STATUS_HLCK) {
 		dprintk("No signal\n");
 		return -EBUSY;
 	}

 	dprintk("Signal found\n");

 	if (status & SAA7191_STATUS_FIDT) {
 		/* 60hz signal -> NTSC */
 		dprintk("NTSC\n");
 		return saa7191_set_norm(client, SAA7191_NORM_NTSC);
 	} else {
 		/* 50hz signal -> PAL */
 		dprintk("PAL\n");
 		return saa7191_set_norm(client, SAA7191_NORM_PAL);
 	}
 }

 static int saa7191_get_control(struct i2c_client *client,
 			       struct saa7191_control *ctrl)
 {
 	u8 reg;
 	int ret = 0;

 	switch (ctrl->type) {
 	case SAA7191_CONTROL_BANDPASS:
 	case SAA7191_CONTROL_BANDPASS_WEIGHT:
 	case SAA7191_CONTROL_CORING:
 		reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
 		switch (ctrl->type) {
 		case SAA7191_CONTROL_BANDPASS:
 			ctrl->value = ((s32)reg & SAA7191_LUMA_BPSS_MASK)
 				>> SAA7191_LUMA_BPSS_SHIFT;
 			break;
 		case SAA7191_CONTROL_BANDPASS_WEIGHT:
 			ctrl->value = ((s32)reg & SAA7191_LUMA_APER_MASK)
 				>> SAA7191_LUMA_APER_SHIFT;
 			break;
 		case SAA7191_CONTROL_CORING:
 			ctrl->value = ((s32)reg & SAA7191_LUMA_CORI_MASK)
 				>> SAA7191_LUMA_CORI_SHIFT;
 			break;
 		}
 		break;
 	case SAA7191_CONTROL_FORCE_COLOUR:
 	case SAA7191_CONTROL_CHROMA_GAIN:
 		reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
 		if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR)
 			ctrl->value = ((s32)reg & SAA7191_GAIN_COLO) ? 1 : 0;
 		else
 			ctrl->value = ((s32)reg & SAA7191_GAIN_LFIS_MASK)
 				>> SAA7191_GAIN_LFIS_SHIFT;
 		break;
 	case SAA7191_CONTROL_HUE:
 		reg = saa7191_read_reg(client, SAA7191_REG_HUEC);
 		if (reg < 0x80)
 			reg += 0x80;
 		else
 			reg -= 0x80;
 		ctrl->value = (s32)reg;
 		break;
 	case SAA7191_CONTROL_VTRC:
 		reg = saa7191_read_reg(client, SAA7191_REG_STDC);
 		ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
 		break;
 	case SAA7191_CONTROL_LUMA_DELAY:
 		reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
 		ctrl->value = ((s32)reg & SAA7191_CTL3_YDEL_MASK)
 			>> SAA7191_CTL3_YDEL_SHIFT;
 		if (ctrl->value >= 4)
 			ctrl->value -= 8;
 		break;
 	case SAA7191_CONTROL_VNR:
 		reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
 		ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
 			>> SAA7191_CTL4_VNOI_SHIFT;
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static int saa7191_set_control(struct i2c_client *client,
 			       struct saa7191_control *ctrl)
 {
 	u8 reg;
 	int ret = 0;

 	switch (ctrl->type) {
 	case SAA7191_CONTROL_BANDPASS:
 	case SAA7191_CONTROL_BANDPASS_WEIGHT:
 	case SAA7191_CONTROL_CORING:
 		reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
 		switch (ctrl->type) {
 		case SAA7191_CONTROL_BANDPASS:
 			reg &= ~SAA7191_LUMA_BPSS_MASK;
 			reg |= (ctrl->value << SAA7191_LUMA_BPSS_SHIFT)
 				& SAA7191_LUMA_BPSS_MASK;
 			break;
 		case SAA7191_CONTROL_BANDPASS_WEIGHT:
 			reg &= ~SAA7191_LUMA_APER_MASK;
 			reg |= (ctrl->value << SAA7191_LUMA_APER_SHIFT)
 				& SAA7191_LUMA_APER_MASK;
 			break;
 		case SAA7191_CONTROL_CORING:
 			reg &= ~SAA7191_LUMA_CORI_MASK;
 			reg |= (ctrl->value << SAA7191_LUMA_CORI_SHIFT)
 				& SAA7191_LUMA_CORI_MASK;
 			break;
 		}
 		ret = saa7191_write_reg(client, SAA7191_REG_LUMA, reg);
 		break;
 	case SAA7191_CONTROL_FORCE_COLOUR:
 	case SAA7191_CONTROL_CHROMA_GAIN:
 		reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
 		if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR) {
 			if (ctrl->value)
 				reg |= SAA7191_GAIN_COLO;
 			else
 				reg &= ~SAA7191_GAIN_COLO;
 		} else {
 			reg &= ~SAA7191_GAIN_LFIS_MASK;
 			reg |= (ctrl->value << SAA7191_GAIN_LFIS_SHIFT)
 				& SAA7191_GAIN_LFIS_MASK;
 		}
 		ret = saa7191_write_reg(client, SAA7191_REG_GAIN, reg);
 		break;
 	case SAA7191_CONTROL_HUE:
 		reg = ctrl->value & 0xff;
 		if (reg < 0x80)
 			reg += 0x80;
 		else
 			reg -= 0x80;
 		ret = saa7191_write_reg(client, SAA7191_REG_HUEC, reg);
 		break;
 	case SAA7191_CONTROL_VTRC:
 		reg = saa7191_read_reg(client, SAA7191_REG_STDC);
 		if (ctrl->value)
 			reg |= SAA7191_STDC_VTRC;
 		else
 			reg &= ~SAA7191_STDC_VTRC;
 		ret = saa7191_write_reg(client, SAA7191_REG_STDC, reg);
 		break;
 	case SAA7191_CONTROL_LUMA_DELAY: {
 		s32 value = ctrl->value;
 		if (value < 0)
 			value += 8;
 		reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
 		reg &= ~SAA7191_CTL3_YDEL_MASK;
 		reg |= (value << SAA7191_CTL3_YDEL_SHIFT)
 			& SAA7191_CTL3_YDEL_MASK;
 		ret = saa7191_write_reg(client, SAA7191_REG_CTL3, reg);
 		break;
 	}
 	case SAA7191_CONTROL_VNR:
 		reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
 		reg &= ~SAA7191_CTL4_VNOI_MASK;
 		reg |= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
 			& SAA7191_CTL4_VNOI_MASK;
 		ret = saa7191_write_reg(client, SAA7191_REG_CTL4, reg);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

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

 	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;

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

 	printk(KERN_INFO "SAA7191 initialized\n");

 	decoder->input = SAA7191_INPUT_COMPOSITE;
 	decoder->norm = SAA7191_NORM_PAL;

 	err = saa7191_autodetect_norm(client);
 	if (err && (err != -EBUSY)) {
 		printk(KERN_ERR "SAA7191: Signal auto-detection failed\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;
 		u8 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_autodetect_norm(client);
 		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;
 		u8 status_reg;

 		if (saa7191_read_status(client, &status_reg))
 			return -EIO;

 		status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
 			? 1 : 0;
 		status->signal_60hz = (status_reg & SAA7191_STATUS_FIDT)
 			? 1 : 0;
 		status->color = (status_reg & SAA7191_STATUS_CODE) ? 1 : 0;

 		status->input = decoder->input;
 		status->norm = decoder->norm;

 		break;
 	}
 	case DECODER_SAA7191_SET_NORM: {
 		int *norm = arg;

 		switch (*norm) {
 		case SAA7191_NORM_AUTO:
 			return saa7191_autodetect_norm(client);
 		case SAA7191_NORM_AUTO_EXT:
 			return saa7191_autodetect_norm_extended(client);
 		default:
 			return saa7191_set_norm(client, *norm);
 		}
 	}
 	case DECODER_SAA7191_GET_CONTROL: {
 		return saa7191_get_control(client, arg);
 	}
 	case DECODER_SAA7191_SET_CONTROL: {
 		return saa7191_set_control(client, arg);
 	}
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static struct i2c_driver i2c_driver_saa7191 = {
 	.driver = {
 		.name 	= "saa7191",
 	},
 	.id		= I2C_DRIVERID_SAA7191,
 	.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/slab.h>

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

	#include "saa7191.h"

	#define SAA7191_MODULE_VERSION "0.0.5"

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

	// #define SAA7191_DEBUG

	#ifdef SAA7191_DEBUG
	#define dprintk(x...) printk("SAA7191: " x);
	#else
	#define dprintk(x...)
	#endif

	#define SAA7191_SYNC_COUNT 30
	#define SAA7191_SYNC_DELAY 100 /* milliseconds */

	struct saa7191 {
	struct i2c_client *client;

	/* the register values are stored here as the actual
	* I2C-registers are write-only */
	u8 reg[25];

	int input;
	int norm;
	};

	static struct i2c_driver i2c_driver_saa7191;

	static const u8 initseq[] = {
	0, /* Subaddress */

	0x50, /* (0x50) SAA7191_REG_IDEL */

	/* 50 Hz signal timing */
	0x30, /* (0x30) SAA7191_REG_HSYB */
	0x00, /* (0x00) SAA7191_REG_HSYS */
	0xe8, /* (0xe8) SAA7191_REG_HCLB */
	0xb6, /* (0xb6) SAA7191_REG_HCLS */
	0xf4, /* (0xf4) SAA7191_REG_HPHI */

	/* control */
	SAA7191_LUMA_APER_1, /* (0x01) SAA7191_REG_LUMA - CVBS mode */
	0x00, /* (0x00) SAA7191_REG_HUEC */
	0xf8, /* (0xf8) SAA7191_REG_CKTQ */
	0xf8, /* (0xf8) SAA7191_REG_CKTS */
	0x90, /* (0x90) SAA7191_REG_PLSE */
	0x90, /* (0x90) SAA7191_REG_SESE */
	0x00, /* (0x00) SAA7191_REG_GAIN */
	SAA7191_STDC_NFEN \| SAA7191_STDC_HRMV, /* (0x0c) SAA7191_REG_STDC
	* - not SECAM,
	* slow time constant */
	SAA7191_IOCK_OEDC \| SAA7191_IOCK_OEHS \| SAA7191_IOCK_OEVS
	\| SAA7191_IOCK_OEDY, /* (0x78) SAA7191_REG_IOCK
	* - chroma from CVBS, GPSW1 & 2 off */
	SAA7191_CTL3_AUFD \| SAA7191_CTL3_SCEN \| SAA7191_CTL3_OFTS
	\| SAA7191_CTL3_YDEL0, /* (0x99) SAA7191_REG_CTL3
	* - automatic field detection */
	0x00, /* (0x00) SAA7191_REG_CTL4 */
	0x2c, /* (0x2c) SAA7191_REG_CHCV - PAL nominal value */
	0x00, /* unused */
	0x00, /* unused */

	/* 60 Hz signal timing */
	0x34, /* (0x34) SAA7191_REG_HS6B */
	0x0a, /* (0x0a) SAA7191_REG_HS6S */
	0xf4, /* (0xf4) SAA7191_REG_HC6B */
	0xce, /* (0xce) SAA7191_REG_HC6S */
	0xf4, /* (0xf4) SAA7191_REG_HP6I */
	};

	/* SAA7191 register handling */

	static u8 saa7191_read_reg(struct i2c_client *client,
	u8 reg)
	{
	return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
	}

	static int saa7191_read_status(struct i2c_client *client,
	u8 *value)
	{
	int ret;

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

	return 0;
	}


	static int saa7191_write_reg(struct i2c_client *client, u8 reg,
	u8 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,
	u8 length, const u8 *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\n");
	return ret;
	}

	return 0;
	}

	/* Helper functions */

	static int saa7191_set_input(struct i2c_client *client, int input)
	{
	struct saa7191 *decoder = i2c_get_clientdata(client);
	u8 luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
	u8 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;

	decoder->input = input;

	return 0;
	}

	static int saa7191_set_norm(struct i2c_client *client, int norm)
	{
	struct saa7191 *decoder = i2c_get_clientdata(client);
	u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
	u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
	u8 chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
	int err;

	switch(norm) {
	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;

	dprintk("ctl3: %02x stdc: %02x chcv: %02x\n", ctl3,
	stdc, chcv);
	dprintk("norm: %d\n", norm);

	return 0;
	}

	static int saa7191_wait_for_signal(struct i2c_client client, u8 status)
	{
	int i = 0;

	dprintk("Checking for signal...\n");

	for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
	if (saa7191_read_status(client, status))
	return -EIO;

	if (((*status) & SAA7191_STATUS_HLCK) == 0) {
	dprintk("Signal found\n");
	return 0;
	}

	msleep(SAA7191_SYNC_DELAY);
	}

	dprintk("No signal\n");

	return -EBUSY;
	}

	static int saa7191_autodetect_norm_extended(struct i2c_client *client)
	{
	u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
	u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
	u8 status;
	int err = 0;

	dprintk("SAA7191 extended signal auto-detection...\n");

	stdc &= ~SAA7191_STDC_SECS;
	ctl3 &= ~(SAA7191_CTL3_FSEL);

	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
	if (err) {
	err = -EIO;
	goto out;
	}
	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
	if (err) {
	err = -EIO;
	goto out;
	}

	ctl3 \|= SAA7191_CTL3_AUFD;
	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
	if (err) {
	err = -EIO;
	goto out;
	}

	msleep(SAA7191_SYNC_DELAY);

	err = saa7191_wait_for_signal(client, &status);
	if (err)
	goto out;

	if (status & SAA7191_STATUS_FIDT) {
	/* 60Hz signal -> NTSC */
	dprintk("60Hz signal: NTSC\n");
	return saa7191_set_norm(client, SAA7191_NORM_NTSC);
	}

	/* 50Hz signal */
	dprintk("50Hz signal: Trying PAL...\n");

	/* try PAL first */
	err = saa7191_set_norm(client, SAA7191_NORM_PAL);
	if (err)
	goto out;

	msleep(SAA7191_SYNC_DELAY);

	err = saa7191_wait_for_signal(client, &status);
	if (err)
	goto out;

	/* not 50Hz ? */
	if (status & SAA7191_STATUS_FIDT) {
	dprintk("No 50Hz signal\n");
	err = -EAGAIN;
	goto out;
	}

	if (status & SAA7191_STATUS_CODE) {
	dprintk("PAL\n");
	return 0;
	}

	dprintk("No color detected with PAL - Trying SECAM...\n");

	/* no color detected ? -> try SECAM */
	err = saa7191_set_norm(client,
	SAA7191_NORM_SECAM);
	if (err)
	goto out;

	msleep(SAA7191_SYNC_DELAY);

	err = saa7191_wait_for_signal(client, &status);
	if (err)
	goto out;

	/* not 50Hz ? */
	if (status & SAA7191_STATUS_FIDT) {
	dprintk("No 50Hz signal\n");
	err = -EAGAIN;
	goto out;
	}

	if (status & SAA7191_STATUS_CODE) {
	/* Color detected -> SECAM */
	dprintk("SECAM\n");
	return 0;
	}

	dprintk("No color detected with SECAM - Going back to PAL.\n");

	/* still no color detected ?
	* -> set norm back to PAL */
	err = saa7191_set_norm(client,
	SAA7191_NORM_PAL);
	if (err)
	goto out;

	out:
	ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
	if (ctl3 & SAA7191_CTL3_AUFD) {
	ctl3 &= ~(SAA7191_CTL3_AUFD);
	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
	if (err) {
	err = -EIO;
	}
	}

	return err;
	}

	static int saa7191_autodetect_norm(struct i2c_client *client)
	{
	u8 status;

	dprintk("SAA7191 signal auto-detection...\n");

	dprintk("Reading status...\n");

	if (saa7191_read_status(client, &status))
	return -EIO;

	dprintk("Checking for signal...\n");

	/* no signal ? */
	if (status & SAA7191_STATUS_HLCK) {
	dprintk("No signal\n");
	return -EBUSY;
	}

	dprintk("Signal found\n");

	if (status & SAA7191_STATUS_FIDT) {
	/* 60hz signal -> NTSC */
	dprintk("NTSC\n");
	return saa7191_set_norm(client, SAA7191_NORM_NTSC);
	} else {
	/* 50hz signal -> PAL */
	dprintk("PAL\n");
	return saa7191_set_norm(client, SAA7191_NORM_PAL);
	}
	}

	static int saa7191_get_control(struct i2c_client *client,
	struct saa7191_control *ctrl)
	{
	u8 reg;
	int ret = 0;

	switch (ctrl->type) {
	case SAA7191_CONTROL_BANDPASS:
	case SAA7191_CONTROL_BANDPASS_WEIGHT:
	case SAA7191_CONTROL_CORING:
	reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
	switch (ctrl->type) {
	case SAA7191_CONTROL_BANDPASS:
	ctrl->value = ((s32)reg & SAA7191_LUMA_BPSS_MASK)
	>> SAA7191_LUMA_BPSS_SHIFT;
	break;
	case SAA7191_CONTROL_BANDPASS_WEIGHT:
	ctrl->value = ((s32)reg & SAA7191_LUMA_APER_MASK)
	>> SAA7191_LUMA_APER_SHIFT;
	break;
	case SAA7191_CONTROL_CORING:
	ctrl->value = ((s32)reg & SAA7191_LUMA_CORI_MASK)
	>> SAA7191_LUMA_CORI_SHIFT;
	break;
	}
	break;
	case SAA7191_CONTROL_FORCE_COLOUR:
	case SAA7191_CONTROL_CHROMA_GAIN:
	reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
	if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR)
	ctrl->value = ((s32)reg & SAA7191_GAIN_COLO) ? 1 : 0;
	else
	ctrl->value = ((s32)reg & SAA7191_GAIN_LFIS_MASK)
	>> SAA7191_GAIN_LFIS_SHIFT;
	break;
	case SAA7191_CONTROL_HUE:
	reg = saa7191_read_reg(client, SAA7191_REG_HUEC);
	if (reg < 0x80)
	reg += 0x80;
	else
	reg -= 0x80;
	ctrl->value = (s32)reg;
	break;
	case SAA7191_CONTROL_VTRC:
	reg = saa7191_read_reg(client, SAA7191_REG_STDC);
	ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
	break;
	case SAA7191_CONTROL_LUMA_DELAY:
	reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
	ctrl->value = ((s32)reg & SAA7191_CTL3_YDEL_MASK)
	>> SAA7191_CTL3_YDEL_SHIFT;
	if (ctrl->value >= 4)
	ctrl->value -= 8;
	break;
	case SAA7191_CONTROL_VNR:
	reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
	ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
	>> SAA7191_CTL4_VNOI_SHIFT;
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static int saa7191_set_control(struct i2c_client *client,
	struct saa7191_control *ctrl)
	{
	u8 reg;
	int ret = 0;

	switch (ctrl->type) {
	case SAA7191_CONTROL_BANDPASS:
	case SAA7191_CONTROL_BANDPASS_WEIGHT:
	case SAA7191_CONTROL_CORING:
	reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
	switch (ctrl->type) {
	case SAA7191_CONTROL_BANDPASS:
	reg &= ~SAA7191_LUMA_BPSS_MASK;
	reg \|= (ctrl->value << SAA7191_LUMA_BPSS_SHIFT)
	& SAA7191_LUMA_BPSS_MASK;
	break;
	case SAA7191_CONTROL_BANDPASS_WEIGHT:
	reg &= ~SAA7191_LUMA_APER_MASK;
	reg \|= (ctrl->value << SAA7191_LUMA_APER_SHIFT)
	& SAA7191_LUMA_APER_MASK;
	break;
	case SAA7191_CONTROL_CORING:
	reg &= ~SAA7191_LUMA_CORI_MASK;
	reg \|= (ctrl->value << SAA7191_LUMA_CORI_SHIFT)
	& SAA7191_LUMA_CORI_MASK;
	break;
	}
	ret = saa7191_write_reg(client, SAA7191_REG_LUMA, reg);
	break;
	case SAA7191_CONTROL_FORCE_COLOUR:
	case SAA7191_CONTROL_CHROMA_GAIN:
	reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
	if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR) {
	if (ctrl->value)
	reg \|= SAA7191_GAIN_COLO;
	else
	reg &= ~SAA7191_GAIN_COLO;
	} else {
	reg &= ~SAA7191_GAIN_LFIS_MASK;
	reg \|= (ctrl->value << SAA7191_GAIN_LFIS_SHIFT)
	& SAA7191_GAIN_LFIS_MASK;
	}
	ret = saa7191_write_reg(client, SAA7191_REG_GAIN, reg);
	break;
	case SAA7191_CONTROL_HUE:
	reg = ctrl->value & 0xff;
	if (reg < 0x80)
	reg += 0x80;
	else
	reg -= 0x80;
	ret = saa7191_write_reg(client, SAA7191_REG_HUEC, reg);
	break;
	case SAA7191_CONTROL_VTRC:
	reg = saa7191_read_reg(client, SAA7191_REG_STDC);
	if (ctrl->value)
	reg \|= SAA7191_STDC_VTRC;
	else
	reg &= ~SAA7191_STDC_VTRC;
	ret = saa7191_write_reg(client, SAA7191_REG_STDC, reg);
	break;
	case SAA7191_CONTROL_LUMA_DELAY: {
	s32 value = ctrl->value;
	if (value < 0)
	value += 8;
	reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
	reg &= ~SAA7191_CTL3_YDEL_MASK;
	reg \|= (value << SAA7191_CTL3_YDEL_SHIFT)
	& SAA7191_CTL3_YDEL_MASK;
	ret = saa7191_write_reg(client, SAA7191_REG_CTL3, reg);
	break;
	}
	case SAA7191_CONTROL_VNR:
	reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
	reg &= ~SAA7191_CTL4_VNOI_MASK;
	reg \|= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
	& SAA7191_CTL4_VNOI_MASK;
	ret = saa7191_write_reg(client, SAA7191_REG_CTL4, reg);
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

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

	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;

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

	printk(KERN_INFO "SAA7191 initialized\n");

	decoder->input = SAA7191_INPUT_COMPOSITE;
	decoder->norm = SAA7191_NORM_PAL;

	err = saa7191_autodetect_norm(client);
	if (err && (err != -EBUSY)) {
	printk(KERN_ERR "SAA7191: Signal auto-detection failed\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;
	u8 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_autodetect_norm(client);
	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;
	u8 status_reg;

	if (saa7191_read_status(client, &status_reg))
	return -EIO;

	status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
	? 1 : 0;
	status->signal_60hz = (status_reg & SAA7191_STATUS_FIDT)
	? 1 : 0;
	status->color = (status_reg & SAA7191_STATUS_CODE) ? 1 : 0;

	status->input = decoder->input;
	status->norm = decoder->norm;

	break;
	}
	case DECODER_SAA7191_SET_NORM: {
	int *norm = arg;

	switch (*norm) {
	case SAA7191_NORM_AUTO:
	return saa7191_autodetect_norm(client);
	case SAA7191_NORM_AUTO_EXT:
	return saa7191_autodetect_norm_extended(client);
	default:
	return saa7191_set_norm(client, *norm);
	}
	}
	case DECODER_SAA7191_GET_CONTROL: {
	return saa7191_get_control(client, arg);
	}
	case DECODER_SAA7191_SET_CONTROL: {
	return saa7191_set_control(client, arg);
	}
	default:
	return -EINVAL;
	}

	return 0;
	}

	static struct i2c_driver i2c_driver_saa7191 = {
	.driver = {
	.name = "saa7191",
	},
	.id = I2C_DRIVERID_SAA7191,
	.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);