[deliverable/linux.git] / drivers / media / video / usbvision / usbvision-i2c.c

/*
 * usbvision_i2c.c
 *  i2c algorithm for USB-I2C Bridges
 *
 * Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de>
 *                         Dwaine Garden <dwainegarden@rogers.com>
 *
 * This module is part of usbvision driver project.
 * Updates to driver completed by Dwaine P. Garden
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include "usbvision.h"

#define DBG_I2C		1<<0

static int i2c_debug = 0;

module_param (i2c_debug, int, 0644);			// debug_i2c_usb mode of the device driver
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

#define PDEBUG(level, fmt, args...) \
		if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)

static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			    short len);
static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			   short len);

static inline int try_write_address(struct i2c_adapter *i2c_adap,
				    unsigned char addr, int retries)
{
	struct usb_usbvision *usbvision;
	int i, ret = -1;
	char buf[4];

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
	buf[0] = 0x00;
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_I2C,"Maybe there's no device at this address");
	}
	return ret;
}

static inline int try_read_address(struct i2c_adapter *i2c_adap,
				   unsigned char addr, int retries)
{
	struct usb_usbvision *usbvision;
	int i, ret = -1;
	char buf[4];

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_I2C,"Maybe there's no device at this address");
	}
	return ret;
}

static inline int usb_find_address(struct i2c_adapter *i2c_adap,
				   struct i2c_msg *msg, int retries,
				   unsigned char *add)
{
	unsigned short flags = msg->flags;

	unsigned char addr;
	int ret;
	if ((flags & I2C_M_TEN)) {
		/* a ten bit address */
		addr = 0xf0 | ((msg->addr >> 7) & 0x03);
		/* try extended address code... */
		ret = try_write_address(i2c_adap, addr, retries);
		if (ret != 1) {
			err("died at extended address code, while writing");
			return -EREMOTEIO;
		}
		add[0] = addr;
		if (flags & I2C_M_RD) {
			/* okay, now switch into reading mode */
			addr |= 0x01;
			ret = try_read_address(i2c_adap, addr, retries);
			if (ret != 1) {
				err("died at extended address code, while reading");
				return -EREMOTEIO;
			}
		}

	} else {		/* normal 7bit address  */
		addr = (msg->addr << 1);
		if (flags & I2C_M_RD)
			addr |= 1;
		if (flags & I2C_M_REV_DIR_ADDR)
			addr ^= 1;

		add[0] = addr;
		if (flags & I2C_M_RD)
			ret = try_read_address(i2c_adap, addr, retries);
		else
			ret = try_write_address(i2c_adap, addr, retries);

		if (ret != 1) {
			return -EREMOTEIO;
		}
	}
	return 0;
}

static int
usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
{
	struct i2c_msg *pmsg;
	struct usb_usbvision *usbvision;
	int i, ret;
	unsigned char addr;

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);

	for (i = 0; i < num; i++) {
		pmsg = &msgs[i];
		ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
		if (ret != 0) {
			PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
			return (ret < 0) ? ret : -EREMOTEIO;
		}

		if (pmsg->flags & I2C_M_RD) {
			/* read bytes into buffer */
			ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		} else {
			/* write bytes from buffer */
			ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		}
	}
	return num;
}

static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
{
	return 0;
}

static u32 functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
}


/* -----exported algorithm data: -------------------------------------	*/

static struct i2c_algorithm usbvision_algo = {
	.master_xfer   = usbvision_i2c_xfer,
	.smbus_xfer    = NULL,
	.algo_control  = algo_control,
	.functionality = functionality,
};


/*
 * registering functions to load algorithms at runtime
 */
static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
{
	PDEBUG(DBG_I2C, "I2C   debugging is enabled [i2c]");
	PDEBUG(DBG_I2C, "ALGO   debugging is enabled [i2c]");

	/* register new adapter to i2c module... */

	adap->algo = &usbvision_algo;

	adap->timeout = 100;	/* default values, should       */
	adap->retries = 3;	/* be replaced by defines       */

	i2c_add_adapter(adap);

	PDEBUG(DBG_I2C,"i2c bus for %s registered", adap->name);

	return 0;
}

/* ----------------------------------------------------------------------- */
/* usbvision specific I2C functions                                        */
/* ----------------------------------------------------------------------- */
static struct i2c_adapter i2c_adap_template;
static struct i2c_client i2c_client_template;

int usbvision_i2c_register(struct usb_usbvision *usbvision)
{
	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	       sizeof(struct i2c_adapter));
	memcpy(&usbvision->i2c_client, &i2c_client_template,
	       sizeof(struct i2c_client));

	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
		" #%d", usbvision->vdev->minor & 0x1f);
	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;

	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	i2c_set_clientdata(&usbvision->i2c_client, usbvision);

	usbvision->i2c_client.adapter = &usbvision->i2c_adap;

	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
		printk(KERN_ERR "usbvision_register: can't write reg\n");
		return -EBUSY;
	}

#ifdef CONFIG_MODULES
	/* Request the load of the i2c modules we need */
	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	case CODEC_SAA7113:
		request_module("saa7115");
		break;
	case CODEC_SAA7111:
		request_module("saa7115");
		break;
	}
	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
		request_module("tuner");
	}
#endif

	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
}

int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
{

	i2c_del_adapter(&(usbvision->i2c_adap));

	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);

	return 0;
}

void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
		      void *arg)
{
	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
}

static int attach_inform(struct i2c_client *client)
{
	struct usb_usbvision *usbvision;

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);

	switch (client->addr << 1) {
		case 0x42 << 1:
		case 0x43 << 1:
		case 0x4a << 1:
		case 0x4b << 1:
			PDEBUG(DBG_I2C,"attach_inform: tda9887 detected.");
			break;
		case 0x42:
			PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
			break;
		case 0x4a:
			PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
			break;
		case 0x48:
			PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
			break;
		case 0xa0:
			PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
			break;

		default:
			{
				struct tuner_setup tun_setup;

				PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
				usbvision->tuner_addr = client->addr;

				if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
					tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
					tun_setup.type = usbvision->tuner_type;
					tun_setup.addr = usbvision->tuner_addr;
					call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
				}
			}
			break;
	}
	return 0;
}

static int detach_inform(struct i2c_client *client)
{
	struct usb_usbvision *usbvision;

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);

	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
	return 0;
}

static int
usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
		     char *buf, short len)
{
	int rc, retries;

	for (retries = 5;;) {
		rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
		if (rc < 0)
			return rc;

		/* Initiate byte read cycle                    */
		/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
		/*                    d3 0=Wr 1=Rd             */
		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
				      (len & 0x07) | 0x18);
		if (rc < 0)
			return rc;

		/* Test for Busy and ACK */
		do {
			/* USBVISION_SER_CONT -> d4 == 0 busy */
			rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
		} while (rc > 0 && ((rc & 0x10) != 0));	/* Retry while busy */
		if (rc < 0)
			return rc;

		/* USBVISION_SER_CONT -> d5 == 1 Not ack */
		if ((rc & 0x20) == 0)	/* Ack? */
			break;

		/* I2C abort */
		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
		if (rc < 0)
			return rc;

		if (--retries < 0)
			return -1;
	}

	switch (len) {
	case 4:
		buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	case 3:
		buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	case 2:
		buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	case 1:
		buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
		break;
	default:
		printk(KERN_ERR
		       "usbvision_i2c_read_max4: buffer length > 4\n");
	}

	if (i2c_debug & DBG_I2C) {
		int idx;
		for (idx = 0; idx < len; idx++) {
			PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
		}
	}
	return len;
}


static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
				 unsigned char addr, const char *buf,
				 short len)
{
	int rc, retries;
	int i;
	unsigned char value[6];
	unsigned char ser_cont;

	ser_cont = (len & 0x07) | 0x10;

	value[0] = addr;
	value[1] = ser_cont;
	for (i = 0; i < len; i++)
		value[i + 2] = buf[i];

	for (retries = 5;;) {
		rc = usb_control_msg(usbvision->dev,
				     usb_sndctrlpipe(usbvision->dev, 1),
				     USBVISION_OP_CODE,
				     USB_DIR_OUT | USB_TYPE_VENDOR |
				     USB_RECIP_ENDPOINT, 0,
				     (__u16) USBVISION_SER_ADRS, value,
				     len + 2, HZ);

		if (rc < 0)
			return rc;

		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
				      (len & 0x07) | 0x10);
		if (rc < 0)
			return rc;

		/* Test for Busy and ACK */
		do {
			rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
		} while (rc > 0 && ((rc & 0x10) != 0));	/* Retry while busy */
		if (rc < 0)
			return rc;

		if ((rc & 0x20) == 0)	/* Ack? */
			break;

		/* I2C abort */
		usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);

		if (--retries < 0)
			return -1;

	}

	if (i2c_debug & DBG_I2C) {
		int idx;
		for (idx = 0; idx < len; idx++) {
			PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
		}
	}
	return len;
}

static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			    short len)
{
	char *bufPtr = buf;
	int retval;
	int wrcount = 0;
	int count;
	int maxLen = 4;

	while (len > 0) {
		count = (len > maxLen) ? maxLen : len;
		retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
		if (retval > 0) {
			len -= count;
			bufPtr += count;
			wrcount += count;
		} else
			return (retval < 0) ? retval : -EFAULT;
	}
	return wrcount;
}

static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			   short len)
{
	char temp[4];
	int retval, i;
	int rdcount = 0;
	int count;

	while (len > 0) {
		count = (len > 3) ? 4 : len;
		retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
		if (retval > 0) {
			for (i = 0; i < len; i++)
				buf[rdcount + i] = temp[i];
			len -= count;
			rdcount += count;
		} else
			return (retval < 0) ? retval : -EFAULT;
	}
	return rdcount;
}

static struct i2c_adapter i2c_adap_template = {
	.owner = THIS_MODULE,
	.name              = "usbvision",
	.id                = I2C_HW_B_BT848, /* FIXME */
	.client_register   = attach_inform,
	.client_unregister = detach_inform,
#ifdef I2C_ADAP_CLASS_TV_ANALOG
	.class             = I2C_ADAP_CLASS_TV_ANALOG,
#else
	.class		   = I2C_CLASS_TV_ANALOG,
#endif
};

static struct i2c_client i2c_client_template = {
	.name		= "usbvision internal",
};

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
f2242ee5	1	/*
1ff16c20	2	* usbvision_i2c.c
781aa1d1 MCC	3	* i2c algorithm for USB-I2C Bridges
781aa1d1 MCC	4	*
1ff16c20	5	* Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de>
781aa1d1 MCC	6	* Dwaine Garden <dwainegarden@rogers.com>
	7	*
	8	* This module is part of usbvision driver project.
	9	* Updates to driver completed by Dwaine P. Garden
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/delay.h>
	30	#include <linux/slab.h>
	31	#include <linux/version.h>
a1ed551c	32	#include <linux/utsname.h>
781aa1d1 MCC	33	#include <linux/init.h>
	34	#include <asm/uaccess.h>
	35	#include <linux/ioport.h>
	36	#include <linux/errno.h>
781aa1d1 MCC	37	#include <linux/usb.h>
781aa1d1 MCC	38	#include <linux/i2c.h>
483dfdb6	39	#include "usbvision.h"
781aa1d1	40
483dfdb6	41	#define DBG_I2C 1<<0
781aa1d1	42
483dfdb6 TM	43	static int i2c_debug = 0;
	44
	45	module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
	46	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
781aa1d1	47
483dfdb6 TM	48	#define PDEBUG(level, fmt, args...) \
483dfdb6 TM	49	if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)
781aa1d1	50
1ff16c20	51	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26	52	short len);
1ff16c20	53	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26 MCC	54	short len);
2a7e9a26 MCC	55
781aa1d1 MCC	56	static inline int try_write_address(struct i2c_adapter *i2c_adap,
	57	unsigned char addr, int retries)
	58	{
1ff16c20	59	struct usb_usbvision *usbvision;
781aa1d1 MCC	60	int i, ret = -1;
	61	char buf[4];
	62
bf8b20e1	63	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1 MCC	64	buf[0] = 0x00;
781aa1d1 MCC	65	for (i = 0; i <= retries; i++) {
1ff16c20	66	ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
781aa1d1 MCC	67	if (ret == 1)
781aa1d1 MCC	68	break; /* success! */
c6268461	69	udelay(5);
781aa1d1 MCC	70	if (i == retries) /* no success */
781aa1d1 MCC	71	break;
c6268461	72	udelay(10);
781aa1d1	73	}
483dfdb6	74	if (i) {
1ff16c20 TM	75	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	76	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	77	}
	78	return ret;
	79	}
	80
	81	static inline int try_read_address(struct i2c_adapter *i2c_adap,
	82	unsigned char addr, int retries)
	83	{
1ff16c20	84	struct usb_usbvision *usbvision;
781aa1d1 MCC	85	int i, ret = -1;
	86	char buf[4];
	87
bf8b20e1	88	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1	89	for (i = 0; i <= retries; i++) {
1ff16c20	90	ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
781aa1d1 MCC	91	if (ret == 1)
781aa1d1 MCC	92	break; /* success! */
c6268461	93	udelay(5);
781aa1d1 MCC	94	if (i == retries) /* no success */
781aa1d1 MCC	95	break;
c6268461	96	udelay(10);
781aa1d1	97	}
483dfdb6	98	if (i) {
1ff16c20 TM	99	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	100	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	101	}
	102	return ret;
	103	}
	104
	105	static inline int usb_find_address(struct i2c_adapter *i2c_adap,
	106	struct i2c_msg *msg, int retries,
	107	unsigned char *add)
	108	{
	109	unsigned short flags = msg->flags;
f2242ee5	110
781aa1d1 MCC	111	unsigned char addr;
	112	int ret;
	113	if ((flags & I2C_M_TEN)) {
	114	/* a ten bit address */
	115	addr = 0xf0 \| ((msg->addr >> 7) & 0x03);
	116	/* try extended address code... */
	117	ret = try_write_address(i2c_adap, addr, retries);
	118	if (ret != 1) {
	119	err("died at extended address code, while writing");
	120	return -EREMOTEIO;
	121	}
	122	add[0] = addr;
	123	if (flags & I2C_M_RD) {
	124	/* okay, now switch into reading mode */
	125	addr \|= 0x01;
	126	ret = try_read_address(i2c_adap, addr, retries);
	127	if (ret != 1) {
	128	err("died at extended address code, while reading");
	129	return -EREMOTEIO;
	130	}
	131	}
	132
	133	} else { /* normal 7bit address */
	134	addr = (msg->addr << 1);
	135	if (flags & I2C_M_RD)
	136	addr \|= 1;
	137	if (flags & I2C_M_REV_DIR_ADDR)
	138	addr ^= 1;
	139
	140	add[0] = addr;
	141	if (flags & I2C_M_RD)
	142	ret = try_read_address(i2c_adap, addr, retries);
	143	else
	144	ret = try_write_address(i2c_adap, addr, retries);
	145
	146	if (ret != 1) {
	147	return -EREMOTEIO;
	148	}
	149	}
	150	return 0;
	151	}
	152
	153	static int
1ff16c20	154	usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
781aa1d1 MCC	155	{
781aa1d1 MCC	156	struct i2c_msg *pmsg;
1ff16c20	157	struct usb_usbvision *usbvision;
781aa1d1 MCC	158	int i, ret;
	159	unsigned char addr;
	160
bf8b20e1 TM	161	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
bf8b20e1 TM	162
781aa1d1 MCC	163	for (i = 0; i < num; i++) {
	164	pmsg = &msgs[i];
	165	ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
	166	if (ret != 0) {
1ff16c20	167	PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
781aa1d1 MCC	168	return (ret < 0) ? ret : -EREMOTEIO;
	169	}
	170
	171	if (pmsg->flags & I2C_M_RD) {
	172	/* read bytes into buffer */
1ff16c20	173	ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	174	if (ret < pmsg->len) {
	175	return (ret < 0) ? ret : -EREMOTEIO;
	176	}
	177	} else {
	178	/* write bytes from buffer */
1ff16c20	179	ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	180	if (ret < pmsg->len) {
	181	return (ret < 0) ? ret : -EREMOTEIO;
	182	}
	183	}
	184	}
	185	return num;
	186	}
	187
	188	static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
	189	{
	190	return 0;
	191	}
	192
1ff16c20	193	static u32 functionality(struct i2c_adapter *adap)
781aa1d1 MCC	194	{
	195	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_10BIT_ADDR \| I2C_FUNC_PROTOCOL_MANGLING;
	196	}
	197
	198
	199	/* -----exported algorithm data: ------------------------------------- */
	200
1ff16c20 TM	201	static struct i2c_algorithm usbvision_algo = {
1ff16c20 TM	202	.master_xfer = usbvision_i2c_xfer,
781aa1d1	203	.smbus_xfer = NULL,
781aa1d1	204	.algo_control = algo_control,
1ff16c20	205	.functionality = functionality,
781aa1d1 MCC	206	};
	207
	208
bf8b20e1 TM	209	/*
	210	* registering functions to load algorithms at runtime
	211	*/
	212	static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
	213	{
	214	PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
	215	PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
	216
	217	/* register new adapter to i2c module... */
	218
	219	adap->algo = &usbvision_algo;
	220
	221	adap->timeout = 100; /* default values, should */
	222	adap->retries = 3; /* be replaced by defines */
	223
	224	i2c_add_adapter(adap);
	225
	226	PDEBUG(DBG_I2C,"i2c bus for %s registered", adap->name);
	227
	228	return 0;
	229	}
	230
483dfdb6 TM	231	/* ----------------------------------------------------------------------- */
	232	/* usbvision specific I2C functions */
	233	/* ----------------------------------------------------------------------- */
	234	static struct i2c_adapter i2c_adap_template;
483dfdb6 TM	235	static struct i2c_client i2c_client_template;
483dfdb6 TM	236
1ff16c20	237	int usbvision_i2c_register(struct usb_usbvision *usbvision)
483dfdb6	238	{
bf8b20e1 TM	239	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	240	sizeof(struct i2c_adapter));
	241	memcpy(&usbvision->i2c_client, &i2c_client_template,
	242	sizeof(struct i2c_client));
483dfdb6	243
1ff16c20 TM	244	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
1ff16c20 TM	245	" #%d", usbvision->vdev->minor & 0x1f);
bf8b20e1 TM	246	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	247	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
	248
	249	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	250	i2c_set_clientdata(&usbvision->i2c_client, usbvision);
1ff16c20	251
483dfdb6 TM	252	usbvision->i2c_client.adapter = &usbvision->i2c_adap;
	253
	254	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
bf8b20e1	255	printk(KERN_ERR "usbvision_register: can't write reg\n");
483dfdb6 TM	256	return -EBUSY;
	257	}
	258
	259	#ifdef CONFIG_MODULES
	260	/* Request the load of the i2c modules we need */
	261	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	262	case CODEC_SAA7113:
	263	request_module("saa7115");
	264	break;
	265	case CODEC_SAA7111:
	266	request_module("saa7115");
	267	break;
	268	}
	269	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
	270	request_module("tuner");
781aa1d1	271	}
781aa1d1 MCC	272	#endif
781aa1d1 MCC	273
bf8b20e1	274	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
1ff16c20 TM	275	}
	276
	277	int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
	278	{
	279
	280	i2c_del_adapter(&(usbvision->i2c_adap));
	281
	282	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
	283
	284	return 0;
483dfdb6 TM	285	}
	286
	287	void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
	288	void *arg)
	289	{
483dfdb6 TM	290	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
	291	}
	292
	293	static int attach_inform(struct i2c_client *client)
	294	{
	295	struct usb_usbvision *usbvision;
	296
bf8b20e1 TM	297	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
bf8b20e1 TM	298
483dfdb6	299	switch (client->addr << 1) {
3153bd91 TP	300	case 0x42 << 1:
	301	case 0x43 << 1:
	302	case 0x4a << 1:
	303	case 0x4b << 1:
6284feaf	304	PDEBUG(DBG_I2C,"attach_inform: tda9887 detected.");
483dfdb6	305	break;
483dfdb6 TM	306	case 0x42:
	307	PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
	308	break;
	309	case 0x4a:
	310	PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
	311	break;
38284ba3 TM	312	case 0x48:
	313	PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
	314	break;
483dfdb6 TM	315	case 0xa0:
	316	PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
	317	break;
	318
	319	default:
	320	{
	321	struct tuner_setup tun_setup;
	322
	323	PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
	324	usbvision->tuner_addr = client->addr;
	325
	326	if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
	327	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	328	tun_setup.type = usbvision->tuner_type;
	329	tun_setup.addr = usbvision->tuner_addr;
	330	call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
	331	}
	332	}
	333	break;
	334	}
781aa1d1 MCC	335	return 0;
	336	}
	337
483dfdb6 TM	338	static int detach_inform(struct i2c_client *client)
	339	{
	340	struct usb_usbvision *usbvision;
	341
bf8b20e1	342	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
483dfdb6	343
a1ed551c	344	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
483dfdb6 TM	345	return 0;
	346	}
	347
	348	static int
	349	usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
	350	char *buf, short len)
	351	{
	352	int rc, retries;
	353
	354	for (retries = 5;;) {
	355	rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
	356	if (rc < 0)
	357	return rc;
	358
	359	/* Initiate byte read cycle */
	360	/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
	361	/* d3 0=Wr 1=Rd */
	362	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
	363	(len & 0x07) \| 0x18);
	364	if (rc < 0)
	365	return rc;
	366
	367	/* Test for Busy and ACK */
	368	do {
	369	/* USBVISION_SER_CONT -> d4 == 0 busy */
	370	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
	371	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
	372	if (rc < 0)
	373	return rc;
	374
	375	/* USBVISION_SER_CONT -> d5 == 1 Not ack */
	376	if ((rc & 0x20) == 0) /* Ack? */
	377	break;
	378
	379	/* I2C abort */
	380	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
	381	if (rc < 0)
	382	return rc;
	383
	384	if (--retries < 0)
	385	return -1;
	386	}
	387
	388	switch (len) {
	389	case 4:
	390	buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	391	case 3:
	392	buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	393	case 2:
	394	buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	395	case 1:
	396	buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
	397	break;
	398	default:
	399	printk(KERN_ERR
	400	"usbvision_i2c_read_max4: buffer length > 4\n");
	401	}
	402
	403	if (i2c_debug & DBG_I2C) {
	404	int idx;
	405	for (idx = 0; idx < len; idx++) {
	406	PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
	407	}
	408	}
409	return len;
410	}
411
412
413	static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
414	unsigned char addr, const char *buf,
415	short len)
416	{
417	int rc, retries;
418	int i;
419	unsigned char value[6];
420	unsigned char ser_cont;
421
422	ser_cont = (len & 0x07) \| 0x10;
423
424	value[0] = addr;
425	value[1] = ser_cont;
426	for (i = 0; i < len; i++)
427	value[i + 2] = buf[i];
428
429	for (retries = 5;;) {
430	rc = usb_control_msg(usbvision->dev,
431	usb_sndctrlpipe(usbvision->dev, 1),
432	USBVISION_OP_CODE,
433	USB_DIR_OUT \| USB_TYPE_VENDOR \|
434	USB_RECIP_ENDPOINT, 0,
435	(__u16) USBVISION_SER_ADRS, value,
436	len + 2, HZ);
437
438	if (rc < 0)
439	return rc;
440
441	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
442	(len & 0x07) \| 0x10);
443	if (rc < 0)
444	return rc;
445
446	/* Test for Busy and ACK */
447	do {
448	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
449	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
450	if (rc < 0)
451	return rc;
452
453	if ((rc & 0x20) == 0) /* Ack? */
454	break;
455
456	/* I2C abort */
457	usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
458
459	if (--retries < 0)
460	return -1;
461
462	}
463
464	if (i2c_debug & DBG_I2C) {
465	int idx;
466	for (idx = 0; idx < len; idx++) {
467	PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
468	}
469	}
470	return len;
471	}
472
1ff16c20	473	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	474	short len)
	475	{
	476	char *bufPtr = buf;
	477	int retval;
	478	int wrcount = 0;
	479	int count;
	480	int maxLen = 4;
483dfdb6 TM	481
	482	while (len > 0) {
	483	count = (len > maxLen) ? maxLen : len;
	484	retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
	485	if (retval > 0) {
	486	len -= count;
	487	bufPtr += count;
	488	wrcount += count;
	489	} else
	490	return (retval < 0) ? retval : -EFAULT;
	491	}
	492	return wrcount;
	493	}
	494
1ff16c20	495	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	496	short len)
	497	{
	498	char temp[4];
	499	int retval, i;
	500	int rdcount = 0;
	501	int count;
483dfdb6 TM	502
	503	while (len > 0) {
	504	count = (len > 3) ? 4 : len;
	505	retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
	506	if (retval > 0) {
	507	for (i = 0; i < len; i++)
	508	buf[rdcount + i] = temp[i];
	509	len -= count;
	510	rdcount += count;
	511	} else
	512	return (retval < 0) ? retval : -EFAULT;
	513	}
	514	return rdcount;
	515	}
	516
483dfdb6 TM	517	static struct i2c_adapter i2c_adap_template = {
	518	.owner = THIS_MODULE,
	519	.name = "usbvision",
	520	.id = I2C_HW_B_BT848, /* FIXME */
483dfdb6 TM	521	.client_register = attach_inform,
483dfdb6 TM	522	.client_unregister = detach_inform,
a1ed551c	523	#ifdef I2C_ADAP_CLASS_TV_ANALOG
483dfdb6	524	.class = I2C_ADAP_CLASS_TV_ANALOG,
a1ed551c	525	#else
483dfdb6 TM	526	.class = I2C_CLASS_TV_ANALOG,
	527	#endif
	528	};
	529
	530	static struct i2c_client i2c_client_template = {
	531	.name = "usbvision internal",
	532	};
	533
483dfdb6 TM	534	/*
	535	* Overrides for Emacs so that we follow Linus's tabbing style.
	536	* ---------------------------------------------------------------------------
	537	* Local variables:
	538	* c-basic-offset: 8
	539	* End:
	540	*/