drivers/media/video/saa7134/saa7134-i2c.c - kernel/skids - Git at Google

 /*
  *
  * device driver for philips saa7134 based TV cards
  * i2c interface support
  *
  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  *
  *  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/init.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>

 #include "saa7134-reg.h"
 #include "saa7134.h"
 #include <media/v4l2-common.h>

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

 static unsigned int i2c_debug;
 module_param(i2c_debug, int, 0644);
 MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");

 static unsigned int i2c_scan;
 module_param(i2c_scan, int, 0444);
 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");

 #define d1printk if (1 == i2c_debug) printk
 #define d2printk if (2 == i2c_debug) printk

 #define I2C_WAIT_DELAY  32
 #define I2C_WAIT_RETRY  16

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

 static char *str_i2c_status[] = {
 	"IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
 	"DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
 	"NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
 };

 enum i2c_status {
 	IDLE          = 0,  // no I2C command pending
 	DONE_STOP     = 1,  // I2C command done and STOP executed
 	BUSY          = 2,  // executing I2C command
 	TO_SCL        = 3,  // executing I2C command, time out on clock stretching
 	TO_ARB        = 4,  // time out on arbitration trial, still trying
 	DONE_WRITE    = 5,  // I2C command done and awaiting next write command
 	DONE_READ     = 6,  // I2C command done and awaiting next read command
 	DONE_WRITE_TO = 7,  // see 5, and time out on status echo
 	DONE_READ_TO  = 8,  // see 6, and time out on status echo
 	NO_DEVICE     = 9,  // no acknowledge on device slave address
 	NO_ACKN       = 10, // no acknowledge after data byte transfer
 	BUS_ERR       = 11, // bus error
 	ARB_LOST      = 12, // arbitration lost during transfer
 	SEQ_ERR       = 13, // erroneous programming sequence
 	ST_ERR        = 14, // wrong status echoing
 	SW_ERR        = 15  // software error
 };

 static char *str_i2c_attr[] = {
 	"NOP", "STOP", "CONTINUE", "START"
 };

 enum i2c_attr {
 	NOP           = 0,  // no operation on I2C bus
 	STOP          = 1,  // stop condition, no associated byte transfer
 	CONTINUE      = 2,  // continue with byte transfer
 	START         = 3   // start condition with byte transfer
 };

 static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
 {
 	enum i2c_status status;

 	status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
 	d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
 		 str_i2c_status[status]);
 	return status;
 }

 static inline void i2c_set_status(struct saa7134_dev *dev,
 				  enum i2c_status status)
 {
 	d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
 		 str_i2c_status[status]);
 	saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
 }

 static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
 {
 	d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
 		 str_i2c_attr[attr]);
 	saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
 }

 static inline int i2c_is_error(enum i2c_status status)
 {
 	switch (status) {
 	case NO_DEVICE:
 	case NO_ACKN:
 	case BUS_ERR:
 	case ARB_LOST:
 	case SEQ_ERR:
 	case ST_ERR:
 		return true;
 	default:
 		return false;
 	}
 }

 static inline int i2c_is_idle(enum i2c_status status)
 {
 	switch (status) {
 	case IDLE:
 	case DONE_STOP:
 		return true;
 	default:
 		return false;
 	}
 }

 static inline int i2c_is_busy(enum i2c_status status)
 {
 	switch (status) {
 	case BUSY:
 	case TO_SCL:
 	case TO_ARB:
 		return true;
 	default:
 		return false;
 	}
 }

 static int i2c_is_busy_wait(struct saa7134_dev *dev)
 {
 	enum i2c_status status;
 	int count;

 	for (count = 0; count < I2C_WAIT_RETRY; count++) {
 		status = i2c_get_status(dev);
 		if (!i2c_is_busy(status))
 			break;
 		saa_wait(I2C_WAIT_DELAY);
 	}
 	if (I2C_WAIT_RETRY == count)
 		return false;
 	return true;
 }

 static int i2c_reset(struct saa7134_dev *dev)
 {
 	enum i2c_status status;
 	int count;

 	d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
 	status = i2c_get_status(dev);
 	if (!i2c_is_error(status))
 		return true;
 	i2c_set_status(dev,status);

 	for (count = 0; count < I2C_WAIT_RETRY; count++) {
 		status = i2c_get_status(dev);
 		if (!i2c_is_error(status))
 			break;
 		udelay(I2C_WAIT_DELAY);
 	}
 	if (I2C_WAIT_RETRY == count)
 		return false;

 	if (!i2c_is_idle(status))
 		return false;

 	i2c_set_attr(dev,NOP);
 	return true;
 }

 static inline int i2c_send_byte(struct saa7134_dev *dev,
 				enum i2c_attr attr,
 				unsigned char data)
 {
 	enum i2c_status status;
 	__u32 dword;

 	/* have to write both attr + data in one 32bit word */
 	dword  = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
 	dword &= 0x0f;
 	dword |= (attr << 6);
 	dword |= ((__u32)data << 8);
 	dword |= 0x00 << 16;  /* 100 kHz */
 //	dword |= 0x40 << 16;  /* 400 kHz */
 	dword |= 0xf0 << 24;
 	saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
 	d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);

 	if (!i2c_is_busy_wait(dev))
 		return -EIO;
 	status = i2c_get_status(dev);
 	if (i2c_is_error(status))
 		return -EIO;
 	return 0;
 }

 static inline int i2c_recv_byte(struct saa7134_dev *dev)
 {
 	enum i2c_status status;
 	unsigned char data;

 	i2c_set_attr(dev,CONTINUE);
 	if (!i2c_is_busy_wait(dev))
 		return -EIO;
 	status = i2c_get_status(dev);
 	if (i2c_is_error(status))
 		return -EIO;
 	data = saa_readb(SAA7134_I2C_DATA);
 	d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
 	return data;
 }

 static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
 			    struct i2c_msg *msgs, int num)
 {
 	struct saa7134_dev *dev = i2c_adap->algo_data;
 	enum i2c_status status;
 	unsigned char data;
 	int addr,rc,i,byte;

 	status = i2c_get_status(dev);
 	if (!i2c_is_idle(status))
 		if (!i2c_reset(dev))
 			return -EIO;

 	d2printk("start xfer\n");
 	d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
 	for (i = 0; i < num; i++) {
 		if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
 			/* send address */
 			d2printk("send address\n");
 			addr  = msgs[i].addr << 1;
 			if (msgs[i].flags & I2C_M_RD)
 				addr |= 1;
 			if (i > 0 && msgs[i].flags & I2C_M_RD && msgs[i].addr != 0x40) {
 				/* workaround for a saa7134 i2c bug
 				 * needed to talk to the mt352 demux
 				 * thanks to pinnacle for the hint */
 				int quirk = 0xfe;
 				d1printk(" [%02x quirk]",quirk);
 				i2c_send_byte(dev,START,quirk);
 				i2c_recv_byte(dev);
 			}
 			d1printk(" < %02x", addr);
 			rc = i2c_send_byte(dev,START,addr);
 			if (rc < 0)
 				 goto err;
 		}
 		if (msgs[i].flags & I2C_M_RD) {
 			/* read bytes */
 			d2printk("read bytes\n");
 			for (byte = 0; byte < msgs[i].len; byte++) {
 				d1printk(" =");
 				rc = i2c_recv_byte(dev);
 				if (rc < 0)
 					goto err;
 				d1printk("%02x", rc);
 				msgs[i].buf[byte] = rc;
 			}
 		} else {
 			/* write bytes */
 			d2printk("write bytes\n");
 			for (byte = 0; byte < msgs[i].len; byte++) {
 				data = msgs[i].buf[byte];
 				d1printk(" %02x", data);
 				rc = i2c_send_byte(dev,CONTINUE,data);
 				if (rc < 0)
 					goto err;
 			}
 		}
 	}
 	d2printk("xfer done\n");
 	d1printk(" >");
 	i2c_set_attr(dev,STOP);
 	rc = -EIO;
 	if (!i2c_is_busy_wait(dev))
 		goto err;
 	status = i2c_get_status(dev);
 	if (i2c_is_error(status))
 		goto err;
 	/* ensure that the bus is idle for at least one bit slot */
 	msleep(1);

 	d1printk("\n");
 	return num;
  err:
 	if (1 == i2c_debug) {
 		status = i2c_get_status(dev);
 		printk(" ERROR: %s\n",str_i2c_status[status]);
 	}
 	return rc;
 }

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

 static u32 functionality(struct i2c_adapter *adap)
 {
 	return I2C_FUNC_SMBUS_EMUL;
 }

 static struct i2c_algorithm saa7134_algo = {
 	.master_xfer   = saa7134_i2c_xfer,
 	.functionality = functionality,
 };

 static struct i2c_adapter saa7134_adap_template = {
 	.owner         = THIS_MODULE,
 	.name          = "saa7134",
 	.id            = I2C_HW_SAA7134,
 	.algo          = &saa7134_algo,
 };

 static struct i2c_client saa7134_client_template = {
 	.name	= "saa7134 internal",
 };

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

 static int
 saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
 {
 	unsigned char buf;
 	int i,err;

 	dev->i2c_client.addr = 0xa0 >> 1;
 	buf = 0;
 	if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
 		printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 		       dev->name,err);
 		return -1;
 	}
 	if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
 		printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
 		       dev->name,err);
 		return -1;
 	}
 	for (i = 0; i < len; i++) {
 		if (0 == (i % 16))
 			printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
 		printk(" %02x",eedata[i]);
 		if (15 == (i % 16))
 			printk("\n");
 	}
 	return 0;
 }

 static char *i2c_devs[128] = {
 	[ 0x20      ] = "mpeg encoder (saa6752hs)",
 	[ 0xa0 >> 1 ] = "eeprom",
 	[ 0xc0 >> 1 ] = "tuner (analog)",
 	[ 0x86 >> 1 ] = "tda9887",
 	[ 0x5a >> 1 ] = "remote control",
 };

 static void do_i2c_scan(char *name, struct i2c_client *c)
 {
 	unsigned char buf;
 	int i,rc;

 	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 		c->addr = i;
 		rc = i2c_master_recv(c,&buf,0);
 		if (rc < 0)
 			continue;
 		printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
 		       name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 	}
 }

 int saa7134_i2c_register(struct saa7134_dev *dev)
 {
 	dev->i2c_adap = saa7134_adap_template;
 	dev->i2c_adap.dev.parent = &dev->pci->dev;
 	strcpy(dev->i2c_adap.name,dev->name);
 	dev->i2c_adap.algo_data = dev;
 	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
 	i2c_add_adapter(&dev->i2c_adap);

 	dev->i2c_client = saa7134_client_template;
 	dev->i2c_client.adapter = &dev->i2c_adap;

 	saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
 	if (i2c_scan)
 		do_i2c_scan(dev->name,&dev->i2c_client);

 	/* Instantiate the IR receiver device, if present */
 	saa7134_probe_i2c_ir(dev);
 	return 0;
 }

 int saa7134_i2c_unregister(struct saa7134_dev *dev)
 {
 	i2c_del_adapter(&dev->i2c_adap);
 	return 0;
 }

 /* ----------------------------------------------------------- */
 /*
  * Local variables:
  * c-basic-offset: 8
  * End:
  */
	/*
	*
	* device driver for philips saa7134 based TV cards
	* i2c interface support
	*
	* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
	*
	* 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/init.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/delay.h>

	#include "saa7134-reg.h"
	#include "saa7134.h"
	#include <media/v4l2-common.h>

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

	static unsigned int i2c_debug;
	module_param(i2c_debug, int, 0644);
	MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");

	static unsigned int i2c_scan;
	module_param(i2c_scan, int, 0444);
	MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");

	#define d1printk if (1 == i2c_debug) printk
	#define d2printk if (2 == i2c_debug) printk

	#define I2C_WAIT_DELAY 32
	#define I2C_WAIT_RETRY 16

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

	static char *str_i2c_status[] = {
	"IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
	"DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
	"NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
	};

	enum i2c_status {
	IDLE = 0, // no I2C command pending
	DONE_STOP = 1, // I2C command done and STOP executed
	BUSY = 2, // executing I2C command
	TO_SCL = 3, // executing I2C command, time out on clock stretching
	TO_ARB = 4, // time out on arbitration trial, still trying
	DONE_WRITE = 5, // I2C command done and awaiting next write command
	DONE_READ = 6, // I2C command done and awaiting next read command
	DONE_WRITE_TO = 7, // see 5, and time out on status echo
	DONE_READ_TO = 8, // see 6, and time out on status echo
	NO_DEVICE = 9, // no acknowledge on device slave address
	NO_ACKN = 10, // no acknowledge after data byte transfer
	BUS_ERR = 11, // bus error
	ARB_LOST = 12, // arbitration lost during transfer
	SEQ_ERR = 13, // erroneous programming sequence
	ST_ERR = 14, // wrong status echoing
	SW_ERR = 15 // software error
	};

	static char *str_i2c_attr[] = {
	"NOP", "STOP", "CONTINUE", "START"
	};

	enum i2c_attr {
	NOP = 0, // no operation on I2C bus
	STOP = 1, // stop condition, no associated byte transfer
	CONTINUE = 2, // continue with byte transfer
	START = 3 // start condition with byte transfer
	};

	static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
	{
	enum i2c_status status;

	status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
	d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
	str_i2c_status[status]);
	return status;
	}

	static inline void i2c_set_status(struct saa7134_dev *dev,
	enum i2c_status status)
	{
	d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
	str_i2c_status[status]);
	saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
	}

	static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
	{
	d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
	str_i2c_attr[attr]);
	saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
	}

	static inline int i2c_is_error(enum i2c_status status)
	{
	switch (status) {
	case NO_DEVICE:
	case NO_ACKN:
	case BUS_ERR:
	case ARB_LOST:
	case SEQ_ERR:
	case ST_ERR:
	return true;
	default:
	return false;
	}
	}

	static inline int i2c_is_idle(enum i2c_status status)
	{
	switch (status) {
	case IDLE:
	case DONE_STOP:
	return true;
	default:
	return false;
	}
	}

	static inline int i2c_is_busy(enum i2c_status status)
	{
	switch (status) {
	case BUSY:
	case TO_SCL:
	case TO_ARB:
	return true;
	default:
	return false;
	}
	}

	static int i2c_is_busy_wait(struct saa7134_dev *dev)
	{
	enum i2c_status status;
	int count;

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	status = i2c_get_status(dev);
	if (!i2c_is_busy(status))
	break;
	saa_wait(I2C_WAIT_DELAY);
	}
	if (I2C_WAIT_RETRY == count)
	return false;
	return true;
	}

	static int i2c_reset(struct saa7134_dev *dev)
	{
	enum i2c_status status;
	int count;

	d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
	status = i2c_get_status(dev);
	if (!i2c_is_error(status))
	return true;
	i2c_set_status(dev,status);

	for (count = 0; count < I2C_WAIT_RETRY; count++) {
	status = i2c_get_status(dev);
	if (!i2c_is_error(status))
	break;
	udelay(I2C_WAIT_DELAY);
	}
	if (I2C_WAIT_RETRY == count)
	return false;

	if (!i2c_is_idle(status))
	return false;

	i2c_set_attr(dev,NOP);
	return true;
	}

	static inline int i2c_send_byte(struct saa7134_dev *dev,
	enum i2c_attr attr,
	unsigned char data)
	{
	enum i2c_status status;
	__u32 dword;

	/* have to write both attr + data in one 32bit word */
	dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
	dword &= 0x0f;
	dword \|= (attr << 6);
	dword \|= ((__u32)data << 8);
	dword \|= 0x00 << 16; /* 100 kHz */
	// dword \|= 0x40 << 16; /* 400 kHz */
	dword \|= 0xf0 << 24;
	saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
	d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);

	if (!i2c_is_busy_wait(dev))
	return -EIO;
	status = i2c_get_status(dev);
	if (i2c_is_error(status))
	return -EIO;
	return 0;
	}

	static inline int i2c_recv_byte(struct saa7134_dev *dev)
	{
	enum i2c_status status;
	unsigned char data;

	i2c_set_attr(dev,CONTINUE);
	if (!i2c_is_busy_wait(dev))
	return -EIO;
	status = i2c_get_status(dev);
	if (i2c_is_error(status))
	return -EIO;
	data = saa_readb(SAA7134_I2C_DATA);
	d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
	return data;
	}

	static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
	struct i2c_msg *msgs, int num)
	{
	struct saa7134_dev *dev = i2c_adap->algo_data;
	enum i2c_status status;
	unsigned char data;
	int addr,rc,i,byte;

	status = i2c_get_status(dev);
	if (!i2c_is_idle(status))
	if (!i2c_reset(dev))
	return -EIO;

	d2printk("start xfer\n");
	d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
	for (i = 0; i < num; i++) {
	if (!(msgs[i].flags & I2C_M_NOSTART) \|\| 0 == i) {
	/* send address */
	d2printk("send address\n");
	addr = msgs[i].addr << 1;
	if (msgs[i].flags & I2C_M_RD)
	addr \|= 1;
	if (i > 0 && msgs[i].flags & I2C_M_RD && msgs[i].addr != 0x40) {
	/* workaround for a saa7134 i2c bug
	* needed to talk to the mt352 demux
	* thanks to pinnacle for the hint */
	int quirk = 0xfe;
	d1printk(" [%02x quirk]",quirk);
	i2c_send_byte(dev,START,quirk);
	i2c_recv_byte(dev);
	}
	d1printk(" < %02x", addr);
	rc = i2c_send_byte(dev,START,addr);
	if (rc < 0)
	goto err;
	}
	if (msgs[i].flags & I2C_M_RD) {
	/* read bytes */
	d2printk("read bytes\n");
	for (byte = 0; byte < msgs[i].len; byte++) {
	d1printk(" =");
	rc = i2c_recv_byte(dev);
	if (rc < 0)
	goto err;
	d1printk("%02x", rc);
	msgs[i].buf[byte] = rc;
	}
	} else {
	/* write bytes */
	d2printk("write bytes\n");
	for (byte = 0; byte < msgs[i].len; byte++) {
	data = msgs[i].buf[byte];
	d1printk(" %02x", data);
	rc = i2c_send_byte(dev,CONTINUE,data);
	if (rc < 0)
	goto err;
	}
	}
	}
	d2printk("xfer done\n");
	d1printk(" >");
	i2c_set_attr(dev,STOP);
	rc = -EIO;
	if (!i2c_is_busy_wait(dev))
	goto err;
	status = i2c_get_status(dev);
	if (i2c_is_error(status))
	goto err;
	/* ensure that the bus is idle for at least one bit slot */
	msleep(1);

	d1printk("\n");
	return num;
	err:
	if (1 == i2c_debug) {
	status = i2c_get_status(dev);
	printk(" ERROR: %s\n",str_i2c_status[status]);
	}
	return rc;
	}

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

	static u32 functionality(struct i2c_adapter *adap)
	{
	return I2C_FUNC_SMBUS_EMUL;
	}

	static struct i2c_algorithm saa7134_algo = {
	.master_xfer = saa7134_i2c_xfer,
	.functionality = functionality,
	};

	static struct i2c_adapter saa7134_adap_template = {
	.owner = THIS_MODULE,
	.name = "saa7134",
	.id = I2C_HW_SAA7134,
	.algo = &saa7134_algo,
	};

	static struct i2c_client saa7134_client_template = {
	.name = "saa7134 internal",
	};

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

	static int
	saa7134_i2c_eeprom(struct saa7134_dev dev, unsigned char eedata, int len)
	{
	unsigned char buf;
	int i,err;

	dev->i2c_client.addr = 0xa0 >> 1;
	buf = 0;
	if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
	printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
	dev->name,err);
	return -1;
	}
	if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
	printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
	dev->name,err);
	return -1;
	}
	for (i = 0; i < len; i++) {
	if (0 == (i % 16))
	printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
	printk(" %02x",eedata[i]);
	if (15 == (i % 16))
	printk("\n");
	}
	return 0;
	}

	static char *i2c_devs[128] = {
	[ 0x20 ] = "mpeg encoder (saa6752hs)",
	[ 0xa0 >> 1 ] = "eeprom",
	[ 0xc0 >> 1 ] = "tuner (analog)",
	[ 0x86 >> 1 ] = "tda9887",
	[ 0x5a >> 1 ] = "remote control",
	};

	static void do_i2c_scan(char name, struct i2c_client c)
	{
	unsigned char buf;
	int i,rc;

	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
	c->addr = i;
	rc = i2c_master_recv(c,&buf,0);
	if (rc < 0)
	continue;
	printk("%s: i2c scan: found device @ 0x%x [%s]\n",
	name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	}
	}

	int saa7134_i2c_register(struct saa7134_dev *dev)
	{
	dev->i2c_adap = saa7134_adap_template;
	dev->i2c_adap.dev.parent = &dev->pci->dev;
	strcpy(dev->i2c_adap.name,dev->name);
	dev->i2c_adap.algo_data = dev;
	i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
	i2c_add_adapter(&dev->i2c_adap);

	dev->i2c_client = saa7134_client_template;
	dev->i2c_client.adapter = &dev->i2c_adap;

	saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
	if (i2c_scan)
	do_i2c_scan(dev->name,&dev->i2c_client);

	/* Instantiate the IR receiver device, if present */
	saa7134_probe_i2c_ir(dev);
	return 0;
	}

	int saa7134_i2c_unregister(struct saa7134_dev *dev)
	{
	i2c_del_adapter(&dev->i2c_adap);
	return 0;
	}

	/* ----------------------------------------------------------- */
	/*
	* Local variables:
	* c-basic-offset: 8
	* End:
	*/