C++ US_DEBUGP函数代码示例

static void debug_swoc(struct swoc_info *swocInfo)
{
	US_DEBUGP("SWIMS: SWoC Rev: %02d \n", swocInfo->rev);
	US_DEBUGP("SWIMS: Linux SKU: %04X \n", swocInfo->LinuxSKU);
	US_DEBUGP("SWIMS: Linux Version: %04X \n", swocInfo->LinuxVer);
}

static int usb_stor_control_thread(void * __us)
{

	struct us_data *us = (struct us_data *)__us;
	struct Scsi_Host *host = us_to_host(us);
//---------------------------
pr_info("7 usb stor control thread\n");

	for(;;) {
		//若有u盘拔插或者有命令才会awake，否则一直就在这睡觉觉
		if (wait_for_completion_interruptible(&us->cmnd_ready))
			break;
//从此处wake

		/*  */
		mutex_lock(&(us->dev_mutex));

		/*每当需要写us->srb时候就需要锁之 */
		scsi_lock(host);

	
		if (us->srb == NULL) {
			scsi_unlock(host);
			mutex_unlock(&us->dev_mutex);
			US_DEBUGP("-- exiting\n");
			break;
		}

	
		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
			us->srb->result = DID_ABORT << 16;
			goto SkipForAbort;
		}

		scsi_unlock(host);

		
		 
		if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
			US_DEBUGP("UNKNOWN data direction\n");
			us->srb->result = DID_ERROR << 16;
		}

		
		else if (us->srb->device->id && 
				!(us->fflags & US_FL_SCM_MULT_TARG)) {
			US_DEBUGP("Bad target number (%d:%d)\n",
				  us->srb->device->id, us->srb->device->lun);
			us->srb->result = DID_BAD_TARGET << 16;
		}

		else if (us->srb->device->lun > us->max_lun) {
			US_DEBUGP("Bad LUN (%d:%d)\n",
				  us->srb->device->id, us->srb->device->lun);
			us->srb->result = DID_BAD_TARGET << 16;
		}

		else if ((us->srb->cmnd[0] == INQUIRY) &&
			    (us->fflags & US_FL_FIX_INQUIRY)) {
			unsigned char data_ptr[36] = {
			    0x00, 0x80, 0x02, 0x02,
			    0x1F, 0x00, 0x00, 0x00};

			US_DEBUGP("Faking INQUIRY command\n");
			fill_inquiry_response(us, data_ptr, 36);
			us->srb->result = SAM_STAT_GOOD;
		}

		
		else {
			US_DEBUG(usb_stor_show_command(us->srb));
			us->proto_handler(us->srb, us);
			usb_mark_last_busy(us->pusb_dev);
		}

		
		scsi_lock(host);

		
		if (us->srb->result != DID_ABORT << 16) {
			US_DEBUGP("scsi cmd done, result=0x%x\n", 
				   us->srb->result);
			us->srb->scsi_done(us->srb);
		} else {
			SkipForAbort:
			US_DEBUGP("scsi command aborted\n");
		}

		/* */
		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
			complete(&(us->notify));

			
			clear_bit(US_FLIDX_ABORTING, &us->dflags);
			clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
		}

		
		us->srb = NULL;
		scsi_unlock(host);
//.........这里部分代码省略.........

/*
 * Transport for the Freecom USB/IDE adaptor.
 *
 */
static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct freecom_cb_wrap *fcb;
	struct freecom_status  *fst;
	unsigned int ipipe, opipe;		/* We need both pipes. */
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	/* Get handles for both transports. */
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	/* The ATAPI Command always goes out first. */
	fcb->Type = FCM_PACKET_ATAPI | 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	/* Send it out. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
			FCM_PACKET_LENGTH, NULL);

	/* The Freecom device will only fail if there is something wrong in
	 * USB land.  It returns the status in its own registers, which
	 * come back in the bulk pipe. */
	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("freecom transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* There are times we can optimize out this status read, but it
	 * doesn't hurt us to always do it now. */
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
			FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	/* The firmware will time-out commands after 20 seconds. Some commands
	 * can legitimately take longer than this, so we use a different
	 * command that only waits for the interrupt and then sends status,
	 * without having to send a new ATAPI command to the device.
	 *
	 * NOTE: There is some indication that a data transfer after a timeout
	 * may not work, but that is a condition that should never happen.
	 */
	while (fst->Status & FCM_STATUS_BUSY) {
		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
		US_DEBUGP("fst->Status is %x\n", fst->Status);

		/* Get the status again */
		fcb->Type = FCM_PACKET_STATUS;
		fcb->Timeout = 0;
		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
		memset (fcb->Filler, 0, sizeof (fcb->Filler));

		/* Send it out. */
		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
				FCM_PACKET_LENGTH, NULL);

		/* The Freecom device will only fail if there is something
		 * wrong in USB land.  It returns the status in its own
		 * registers, which come back in the bulk pipe.
		 */
		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP ("freecom transport error\n");
			return USB_STOR_TRANSPORT_ERROR;
		}

		/* get the data */
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_STATUS_PACKET_LENGTH, &partial);

		US_DEBUGP("bar Status result %d %u\n", result, partial);
		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
		return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & 1) != 0) {
		US_DEBUGP("operation failed\n");
		return USB_STOR_TRANSPORT_FAILED;
	}
//.........这里部分代码省略.........

static int sddr55_write_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors,
		unsigned char *content,
		int use_sg) {

	int result;
	unsigned char command[8] = {
		0, 0, 0, 0, 0, 0xb0, 0, 0x86
	};
	unsigned char status[8];
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	unsigned int pba;
	unsigned int new_pba;
	unsigned long address;

	unsigned short pages;
	unsigned char *buffer = NULL;
	unsigned char *ptr;
	struct scatterlist *sg = NULL;
	int i;
	int len;
	int transferred;

	/* check if we are allowed to write */
	if (info->read_only || info->force_read_only) {
		set_sense_info (7, 0x27, 0);	/* read only */
		return USB_STOR_TRANSPORT_FAILED;
	}

	// If we're using scatter-gather, we have to create a new
	// buffer to write all of the data in first, since a
	// scatter-gather buffer could in theory start in the middle
	// of a page, which would be bad. A developer who wants a
	// challenge might want to write a limited-buffer
	// version of this code.

	len = sectors * PAGESIZE;

	if (use_sg) {
		sg = (struct scatterlist *)content;
		buffer = kmalloc(len, GFP_NOIO);
		if (buffer == NULL)
			return USB_STOR_TRANSPORT_ERROR;

		transferred = 0;
		for (i=0; i<use_sg && transferred<len; i++) {
			memcpy(buffer+transferred, sg[i].address,
				len-transferred > sg[i].length ?
					sg[i].length : len-transferred);
			transferred += sg[i].length;
		}

		ptr = buffer;
	} else
		ptr = content;

	while (sectors > 0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Write as many sectors as possible in this block

		pages = info->blocksize - page;
		if (pages > (sectors << info->smallpageshift))
			pages = (sectors << info->smallpageshift);

		US_DEBUGP("Write %02X pages, to PBA %04X"
			" (LBA %04X) page %02X\n",
			pages, pba, lba, page);
			
		command[4] = 0;

		if (pba == NOT_ALLOCATED) {
			/* no pba allocated for this lba, find a free pba to use */

			int max_pba = (info->max_log_blks / 250 ) * 256;
			int found_count = 0;
			int found_pba = -1;

			/* set pba to first block in zone lba is in */
			pba = (lba / 1000) * 1024;

			US_DEBUGP("No PBA for LBA %04X\n",lba);

			if (max_pba > 1024)
				max_pba = 1024;

			/* scan through the map lookiong for an unused block
			 * leave 16 unused blocks at start (or as many as possible)
			 * since the sddr55 seems to reuse a used block when it shouldn't
			 * if we don't leave space */
			for (i = 0; i < max_pba; i++, pba++) {
				if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
//.........这里部分代码省略.........

static int sddr55_raw_bulk(struct us_data *us, 
		int direction,
		unsigned char *data,
		unsigned int len) {

	int result;
	int act_len;
	int pipe;

	if (direction == SCSI_DATA_READ)
		pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
	else
		pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);

	result = usb_stor_bulk_msg(us, data, pipe, len, &act_len);

	/* if we stall, we need to clear it before we go on */
	if (result == -EPIPE) {
		US_DEBUGP("EPIPE: clearing endpoint halt for"
			" pipe 0x%x, stalled at %d bytes\n",
			pipe, act_len);
		usb_clear_halt(us->pusb_dev, pipe);
	}

	if (result) {

		/* NAK - that means we've retried a few times already */
		if (result == -ETIMEDOUT) {
			US_DEBUGP("usbat_raw_bulk():"
				" device NAKed\n");

			return US_BULK_TRANSFER_FAILED;
		}

		/* -ENOENT -- we canceled this transfer */
		if (result == -ENOENT) {
			US_DEBUGP("usbat_raw_bulk():"
				" transfer aborted\n");
			return US_BULK_TRANSFER_ABORTED;
		}

		if (result == -EPIPE) {
			US_DEBUGP("usbat_raw_bulk():"
				" output pipe stalled\n");
			return US_BULK_TRANSFER_FAILED;
		}

		/* the catch-all case */
		US_DEBUGP("us_transfer_partial(): unknown error\n");
		return US_BULK_TRANSFER_FAILED;
	}

	if (act_len != len) {
		US_DEBUGP("Warning: Transferred only %d bytes\n",
			act_len);
		return US_BULK_TRANSFER_SHORT;
	}

	US_DEBUGP("Transferred %d of %d bytes\n", act_len, len);

	return US_BULK_TRANSFER_GOOD;
}

static int sddr55_bulk_transport(struct us_data *us,
			  int direction,
			  unsigned char *data,
			  unsigned int len) {

	int result = USB_STOR_TRANSPORT_GOOD;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	if (len==0)
		return USB_STOR_TRANSPORT_GOOD;

	info->last_access = jiffies;

#ifdef CONFIG_USB_STORAGE_DEBUG
	if (direction == SCSI_DATA_WRITE) {
		int i;
		char string[64];

		/* Debug-print the first 48 bytes of the write transfer */

		strcpy(string, "wr: ");
		for (i=0; i<len && i<48; i++) {
			sprintf(string+strlen(string), "%02X ",
			  data[i]);
			if ((i%16)==15) {
				US_DEBUGP("%s\n", string);
				strcpy(string, "wr: ");
			}
		}
		if ((i%16)!=0)
			US_DEBUGP("%s\n", string);
	}
#endif

	/* transfer the data */

	US_DEBUGP("SCM data %s transfer %d\n",
		  ( direction==SCSI_DATA_READ ? "in" : "out"),
		  len);

	result = sddr55_raw_bulk(us, direction, data, len);

#ifdef CONFIG_USB_STORAGE_DEBUG
	if (direction == SCSI_DATA_READ) {
		int i;
		char string[64];

		/* Debug-print the first 48 bytes of the read transfer */

		strcpy(string, "rd: ");
		for (i=0; i<len && i<48; i++) {
			sprintf(string+strlen(string), "%02X ",
			  data[i]);
			if ((i%16)==15) {
				US_DEBUGP("%s\n", string);
				strcpy(string, "rd: ");
			}
		}
		if ((i%16)!=0)
			US_DEBUGP("%s\n", string);
	}
#endif

	return result;
}

static int sddr55_read_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors,
		unsigned char *content,
		int use_sg) {

	int result;
	unsigned char command[8] = {
		0, 0, 0, 0, 0, 0xb0, 0, 0x85
	};
	unsigned char status[8];
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	unsigned int pba;
	unsigned long address;

	unsigned short pages;
	unsigned char *buffer = NULL;
	unsigned char *ptr;
	struct scatterlist *sg = NULL;
	int i;
	int len;
	int transferred;

	// If we're using scatter-gather, we have to create a new
	// buffer to read all of the data in first, since a
	// scatter-gather buffer could in theory start in the middle
	// of a page, which would be bad. A developer who wants a
	// challenge might want to write a limited-buffer
	// version of this code.

	len = sectors * PAGESIZE;

	if (use_sg) {
		sg = (struct scatterlist *)content;
		buffer = kmalloc(len, GFP_NOIO);
		if (buffer == NULL)
			return USB_STOR_TRANSPORT_ERROR;
		ptr = buffer;
	} else
		ptr = content;

	// This could be made much more efficient by checking for
	// contiguous LBA's. Another exercise left to the student.

	while (sectors>0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Read as many sectors as possible in this block

		pages = info->blocksize - page;
		if (pages > (sectors << info->smallpageshift))
			pages = (sectors << info->smallpageshift);

		US_DEBUGP("Read %02X pages, from PBA %04X"
			" (LBA %04X) page %02X\n",
			pages, pba, lba, page);

		if (pba == NOT_ALLOCATED) {
			/* no pba for this lba, fill with zeroes */
			memset (ptr, 0, pages << info->pageshift);
		} else {

			address = (pba << info->blockshift) + page;

			command[1] = LSB_of(address>>16);
			command[2] = LSB_of(address>>8);
			command[3] = LSB_of(address);

			command[6] = LSB_of(pages << (1 - info->smallpageshift));

			/* send command */
			result = sddr55_bulk_transport(us,
				SCSI_DATA_WRITE, command, 8);

			US_DEBUGP("Result for send_command in read_data %d\n",
				result);

			if (result != US_BULK_TRANSFER_GOOD) {
				if (use_sg)
					kfree(buffer);
				return result;
			}

			/* read data */
			result = sddr55_bulk_transport(us,
				SCSI_DATA_READ, ptr,
				pages<<info->pageshift);

			if (result != US_BULK_TRANSFER_GOOD) {
				if (use_sg)
					kfree(buffer);
				return result;
			}
//.........这里部分代码省略.........

/*
 * Interpret the results of a URB transfer
 *
 * This function prints appropriate debugging messages, clears halts on
 * non-control endpoints, and translates the status to the corresponding
 * USB_STOR_XFER_xxx return code.
 */
static int interpret_urb_result(struct us_data *us, unsigned int pipe,
		unsigned int length, int result, unsigned int partial)
{
	US_DEBUGP("Status code %d; transferred %u/%u\n",
			result, partial, length);
	switch (result) {

	/* no error code; did we send all the data? */
	case 0:
		if (partial != length) {
			US_DEBUGP("-- short transfer\n");
			return USB_STOR_XFER_SHORT;
		}

		US_DEBUGP("-- transfer complete\n");
		return USB_STOR_XFER_GOOD;

	/* stalled */
	case -EPIPE:
		/* for control endpoints, (used by CB[I]) a stall indicates
		 * a failed command */
		if (usb_pipecontrol(pipe)) {
			US_DEBUGP("-- stall on control pipe\n");
#ifdef CONFIG_USB_STORAGE_DETECT
			printk(KERN_INFO "usb storage -- stall on control pipe\n");
#endif
			return USB_STOR_XFER_STALLED;
		}

		/* for other sorts of endpoint, clear the stall */
		US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
		if (usb_stor_clear_halt(us, pipe) < 0)
			return USB_STOR_XFER_ERROR;
		return USB_STOR_XFER_STALLED;

	/* babble - the device tried to send more than we wanted to read */
	case -EOVERFLOW:
		US_DEBUGP("-- babble\n");
#ifdef CONFIG_USB_STORAGE_DETECT
		printk(KERN_INFO "usb storage -- babble\n");
#endif
		return USB_STOR_XFER_LONG;

	/* the transfer was cancelled by abort, disconnect, or timeout */
	case -ECONNRESET:
		US_DEBUGP("-- transfer cancelled\n");
#ifdef CONFIG_USB_STORAGE_DETECT
		printk(KERN_INFO "usb storage -- transfer cancelled\n");
#endif
		return USB_STOR_XFER_ERROR;

	/* short scatter-gather read transfer */
	case -EREMOTEIO:
		US_DEBUGP("-- short read transfer\n");
		return USB_STOR_XFER_SHORT;

	/* abort or disconnect in progress */
	case -EIO:
		US_DEBUGP("-- abort or disconnect in progress\n");
#ifdef CONFIG_USB_STORAGE_DETECT
		printk(KERN_INFO "usb storage -- abort or disconnect in progress\n");
#endif
		return USB_STOR_XFER_ERROR;

	/* the catch-all error case */
	default:
		US_DEBUGP("-- unknown error\n");
#ifdef CONFIG_USB_STORAGE_DETECT
		printk(KERN_INFO "usb storage -- unknown error %d\n", result);
#endif
		return USB_STOR_XFER_ERROR;
	}
}

/* Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int need_auto_sense;
	int result;

	/* send the command to the transport layer */
	srb->resid = 0;
	result = us->transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
		US_DEBUGP("-- command was aborted\n");
		goto Handle_Abort;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR) {
		US_DEBUGP("-- transport indicates error, resetting\n");
		us->transport_reset(us);
		srb->result = DID_ERROR << 16;
		return;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense
	 *
	 * I normally don't use a flag like this, but it's almost impossible
	 * to understand what's going on here if I don't.
	 */
	need_auto_sense = 0;

	/*
	 * If we're running the CB transport, which is incapable
	 * of determining status on its own, we will auto-sense
	 * unless the operation involved a data-in transfer.  Devices
	 * can signal most data-in errors by stalling the bulk-in pipe.
	 */
	if ((us->protocol == US_PR_CB || us->protocol == US_PR_DPCM_USB) &&
			srb->sc_data_direction != DMA_FROM_DEVICE) {
		US_DEBUGP("-- CB transport device requiring auto-sense\n");
		need_auto_sense = 1;
	}

	/*
	 * If we have a failure, we're going to do a REQUEST_SENSE 
	 * automatically.  Note that we differentiate between a command
	 * "failure" and an "error" in the transport mechanism.
	 */
	if (result == USB_STOR_TRANSPORT_FAILED) {
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
	}

	/*
	 * A short transfer on a command where we don't expect it
	 * is unusual, but it doesn't mean we need to auto-sense.
	 */
	if ((srb->resid > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense) {
		int temp_result;
		void* old_request_buffer;
		unsigned short old_sg;
		unsigned old_request_bufflen;
		unsigned char old_sc_data_direction;
		unsigned char old_cmd_len;
		unsigned char old_cmnd[MAX_COMMAND_SIZE];
		unsigned long old_serial_number;
		int old_resid;

		US_DEBUGP("Issuing auto-REQUEST_SENSE\n");

		/* save the old command */
		memcpy(old_cmnd, srb->cmnd, MAX_COMMAND_SIZE);
		old_cmd_len = srb->cmd_len;

		/* set the command and the LUN */
		memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
//.........这里部分代码省略.........

/* This is the common part of the URB message submission code
 *
 * All URBs from the usb-storage driver involved in handling a queued scsi
 * command _must_ pass through this function (or something like it) for the
 * abort mechanisms to work properly.
 */
static int usb_stor_msg_common(struct us_data *us, int timeout)
{
	struct completion urb_done;
	struct timer_list to_timer;
	int status;

	/* don't submit URBs during abort/disconnect processing */
	if (us->flags & ABORTING_OR_DISCONNECTING)
		return -EIO;

	/* set up data structures for the wakeup system */
	init_completion(&urb_done);

	/* fill the common fields in the URB */
	us->current_urb->context = &urb_done;
	us->current_urb->actual_length = 0;
	us->current_urb->error_count = 0;
	us->current_urb->status = 0;

	/* we assume that if transfer_buffer isn't us->iobuf then it
	 * hasn't been mapped for DMA.  Yes, this is clunky, but it's
	 * easier than always having the caller tell us whether the
	 * transfer buffer has already been mapped. */
	us->current_urb->transfer_flags =
			URB_ASYNC_UNLINK | URB_NO_SETUP_DMA_MAP;
	if (us->current_urb->transfer_buffer == us->iobuf)
		us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	us->current_urb->transfer_dma = us->iobuf_dma;
	us->current_urb->setup_dma = us->cr_dma;

	/* submit the URB */
	status = usb_submit_urb(us->current_urb, GFP_NOIO);
	if (status) {
		/* something went wrong */
		return status;
	}

	/* since the URB has been submitted successfully, it's now okay
	 * to cancel it */
	set_bit(US_FLIDX_URB_ACTIVE, &us->flags);

	/* did an abort/disconnect occur during the submission? */
	if (us->flags & ABORTING_OR_DISCONNECTING) {

		/* cancel the URB, if it hasn't been cancelled already */
		if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->flags)) {
			US_DEBUGP("-- cancelling URB\n");
			usb_unlink_urb(us->current_urb);
		}
	}
 
	/* submit the timeout timer, if a timeout was requested */
	if (timeout > 0) {
		init_timer(&to_timer);
		to_timer.expires = jiffies + timeout;
		to_timer.function = timeout_handler;
		to_timer.data = (unsigned long) us;
		add_timer(&to_timer);
	}

	/* wait for the completion of the URB */
	wait_for_completion(&urb_done);
	clear_bit(US_FLIDX_URB_ACTIVE, &us->flags);
 
	/* clean up the timeout timer */
	if (timeout > 0)
		del_timer_sync(&to_timer);

	/* return the URB status */
	return us->current_urb->status;
}

static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct freecom_cb_wrap *fcb;
	struct freecom_status  *fst;
	unsigned int ipipe, opipe;		
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	
	fcb->Type = FCM_PACKET_ATAPI | 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
			FCM_PACKET_LENGTH, NULL);

	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("freecom transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
			FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	while (fst->Status & FCM_STATUS_BUSY) {
		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
		US_DEBUGP("fst->Status is %x\n", fst->Status);

		
		fcb->Type = FCM_PACKET_STATUS;
		fcb->Timeout = 0;
		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
		memset (fcb->Filler, 0, sizeof (fcb->Filler));

		
		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
				FCM_PACKET_LENGTH, NULL);

		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP ("freecom transport error\n");
			return USB_STOR_TRANSPORT_ERROR;
		}

		
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_STATUS_PACKET_LENGTH, &partial);

		US_DEBUGP("bar Status result %d %u\n", result, partial);
		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
		return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & 1) != 0) {
		US_DEBUGP("operation failed\n");
		return USB_STOR_TRANSPORT_FAILED;
	}

	US_DEBUGP("Device indicates that it has %d bytes available\n",
			le16_to_cpu (fst->Count));
	US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));

	
	switch (srb->cmnd[0]) {
	case INQUIRY:
	case REQUEST_SENSE:	
	case MODE_SENSE:
	case MODE_SENSE_10:
		length = le16_to_cpu(fst->Count);
		break;
	default:
		length = scsi_bufflen(srb);
	}

	
	if (length > scsi_bufflen(srb)) {
		length = scsi_bufflen(srb);
		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
//.........这里部分代码省略.........

static int sddr55_status(struct us_data *us)
{
	int result;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;

	/* send command */
	memset(command, 0, 8);
	command[5] = 0xB0;
	command[7] = 0x80;
	result = sddr55_bulk_transport(us,
		SCSI_DATA_WRITE, command, 8);

	US_DEBUGP("Result for send_command in status %d\n",
		result);

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
		return USB_STOR_TRANSPORT_ERROR;
	}

	result = sddr55_bulk_transport(us,
		SCSI_DATA_READ, status,	4);

	/* expect to get short transfer if no card fitted */
	if (result == USB_STOR_XFER_SHORT || result == USB_STOR_XFER_STALLED) {
		/* had a short transfer, no card inserted, free map memory */
		if (info->lba_to_pba)
			kfree(info->lba_to_pba);
		if (info->pba_to_lba)
			kfree(info->pba_to_lba);
		info->lba_to_pba = NULL;
		info->pba_to_lba = NULL;

		info->fatal_error = 0;
		info->force_read_only = 0;

		set_sense_info (2, 0x3a, 0);	/* not ready, medium not present */
		return USB_STOR_TRANSPORT_FAILED;
	}

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
		return USB_STOR_TRANSPORT_FAILED;
	}
	
	/* check write protect status */
	info->read_only = (status[0] & 0x20);

	/* now read status */
	result = sddr55_bulk_transport(us,
		SCSI_DATA_READ, status,	2);

	if (result != USB_STOR_XFER_GOOD) {
		set_sense_info (4, 0, 0);	/* hardware error */
	}

	return (result == USB_STOR_XFER_GOOD ?
			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_FAILED);
}

/*
 * Transport for the Freecom USB/IDE adaptor.
 *
 */
static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct freecom_cb_wrap *fcb;
	struct freecom_status  *fst;
	unsigned int ipipe, opipe;		/* We need both pipes. */
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	/* Get handles for both transports. */
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	/* The ATAPI Command always goes out first. */
	fcb->Type = FCM_PACKET_ATAPI | 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	/* Send it out. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
			FCM_PACKET_LENGTH, NULL);

	/* The Freecom device will only fail if there is something wrong in
	 * USB land.  It returns the status in its own registers, which
	 * come back in the bulk pipe. */
	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("freecom transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* There are times we can optimize out this status read, but it
	 * doesn't hurt us to always do it now. */
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
			FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	/* The firmware will time-out commands after 20 seconds. Some commands
	 * can legitimately take longer than this, so we use a different
	 * command that only waits for the interrupt and then sends status,
<<<<<<< HEAD
	 * without having to send a new ATAPI command to the device.
=======
	 * without having to send a new ATAPI command to the device. 
>>>>>>> 296c66da8a02d52243f45b80521febece5ed498a
	 *
	 * NOTE: There is some indication that a data transfer after a timeout
	 * may not work, but that is a condition that should never happen.
	 */
	while (fst->Status & FCM_STATUS_BUSY) {
		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
		US_DEBUGP("fst->Status is %x\n", fst->Status);

		/* Get the status again */
		fcb->Type = FCM_PACKET_STATUS;
		fcb->Timeout = 0;
		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
		memset (fcb->Filler, 0, sizeof (fcb->Filler));

		/* Send it out. */
		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
				FCM_PACKET_LENGTH, NULL);

		/* The Freecom device will only fail if there is something
		 * wrong in USB land.  It returns the status in its own
		 * registers, which come back in the bulk pipe.
		 */
		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP ("freecom transport error\n");
			return USB_STOR_TRANSPORT_ERROR;
		}

		/* get the data */
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_STATUS_PACKET_LENGTH, &partial);

		US_DEBUGP("bar Status result %d %u\n", result, partial);
		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
		return USB_STOR_TRANSPORT_ERROR;
//.........这里部分代码省略.........

/* Invoke the transport and basic error-handling/recovery methods
 *
 * This is used by the protocol layers to actually send the message to
 * the device and receive the response.
 */
void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	int need_auto_sense;
	int result;

	/* send the command to the transport layer */
	scsi_set_resid(srb, 0);
	result = us->transport(srb, us);

	/* if the command gets aborted by the higher layers, we need to
	 * short-circuit all other processing
	 */
	if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
		US_DEBUGP("-- command was aborted\n");
		srb->result = DID_ABORT << 16;
		goto Handle_Errors;
	}

	/* if there is a transport error, reset and don't auto-sense */
	if (result == USB_STOR_TRANSPORT_ERROR) {
		US_DEBUGP("-- transport indicates error, resetting\n");
		srb->result = DID_ERROR << 16;
		goto Handle_Errors;
	}

	/* if the transport provided its own sense data, don't auto-sense */
	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
		srb->result = SAM_STAT_CHECK_CONDITION;
		return;
	}

	srb->result = SAM_STAT_GOOD;

	/* Determine if we need to auto-sense
	 *
	 * I normally don't use a flag like this, but it's almost impossible
	 * to understand what's going on here if I don't.
	 */
	need_auto_sense = 0;

	/*
	 * If we're running the CB transport, which is incapable
	 * of determining status on its own, we will auto-sense
	 * unless the operation involved a data-in transfer.  Devices
	 * can signal most data-in errors by stalling the bulk-in pipe.
	 */
	if ((us->protocol == US_PR_CB || us->protocol == US_PR_DPCM_USB) &&
			srb->sc_data_direction != DMA_FROM_DEVICE) {
		US_DEBUGP("-- CB transport device requiring auto-sense\n");
		need_auto_sense = 1;
	}

	/*
	 * If we have a failure, we're going to do a REQUEST_SENSE 
	 * automatically.  Note that we differentiate between a command
	 * "failure" and an "error" in the transport mechanism.
	 */
	if (result == USB_STOR_TRANSPORT_FAILED) {
		US_DEBUGP("-- transport indicates command failure\n");
		need_auto_sense = 1;
	}

	/*
	 * A short transfer on a command where we don't expect it
	 * is unusual, but it doesn't mean we need to auto-sense.
	 */
	if ((scsi_get_resid(srb) > 0) &&
	    !((srb->cmnd[0] == REQUEST_SENSE) ||
	      (srb->cmnd[0] == INQUIRY) ||
	      (srb->cmnd[0] == MODE_SENSE) ||
	      (srb->cmnd[0] == LOG_SENSE) ||
	      (srb->cmnd[0] == MODE_SENSE_10))) {
		US_DEBUGP("-- unexpectedly short transfer\n");
	}

	/* Now, if we need to do the auto-sense, let's do it */
	if (need_auto_sense) {
		int temp_result;
		struct scsi_eh_save ses;

		US_DEBUGP("Issuing auto-REQUEST_SENSE\n");

		scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);

		/* FIXME: we must do the protocol translation here */
		if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI ||
				us->subclass == US_SC_CYP_ATACB)
			srb->cmd_len = 6;
		else
			srb->cmd_len = 12;

		/* issue the auto-sense command */
		scsi_set_resid(srb, 0);
		temp_result = us->transport(us->srb, us);

//.........这里部分代码省略.........

//.........这里部分代码省略.........
	case 0x0302: what="excessive write errors"; break;
	case 0x0400: what="LUN not ready, cause not reportable"; break;
	case 0x0401: what="LUN in process of becoming ready"; break;
	case 0x0402: what="LUN not ready, initializing cmd. required"; break;
	case 0x0403: what="LUN not ready, manual intervention required"; break;
	case 0x0404: what="LUN not ready, format in progress"; break;
	case 0x0405: what="LUN not ready, rebuild in progress"; break;
	case 0x0406: what="LUN not ready, recalculation in progress"; break;
	case 0x0407: what="LUN not ready, operation in progress"; break;
	case 0x0408: what="LUN not ready, long write in progress"; break;
	case 0x0500: what="LUN doesn't respond to selection"; break;
	case 0x0A00: what="error log overflow"; break;
	case 0x0C04: what="compression check miscompare error"; break;
	case 0x0C05: what="data expansion occurred during compression"; break;
	case 0x0C06: what="block not compressible"; break;
	case 0x1102: what="error too long to correct"; break;
	case 0x1106: what="CIRC unrecovered error"; break;
	case 0x1107: what="data resynchronization error"; break;
	case 0x110D: what="decompression CRC error"; break;
	case 0x110E: what="can't decompress using declared algorithm"; break;
	case 0x110F: what="error reading UPC/EAN number"; break;
	case 0x1110: what="error reading ISRC number"; break;
	case 0x1200: what="address mark not found for ID field"; break;
	case 0x1300: what="address mark not found for data field"; break;
	case 0x1403: what="end of data not found"; break;
	case 0x1404: what="block sequence error"; break;
	case 0x1600: what="data sync mark error"; break;
	case 0x1601: what="data sync error: data rewritten"; break;
	case 0x1602: what="data sync error: recommend rewrite"; break;
	case 0x1603: what="data sync error: data auto-reallocated"; break;
	case 0x1604: what="data sync error: recommend reassignment"; break;
	case 0x1900: what="defect list error"; break;
	case 0x1901: what="defect list not available"; break;
	case 0x1902: what="defect list error in primary list"; break;
	case 0x1903: what="defect list error in grown list"; break;
	case 0x1C00: what="defect list not found"; break;
	case 0x2400: what="invalid field in CDB"; break;
	case 0x2703: what="associated write protect"; break;
	case 0x2800: what="not ready to ready transition"; break;
	case 0x2903: what="bus device reset function occurred"; break;
	case 0x2904: what="device internal reset"; break;
	case 0x2B00: what="copy can't execute / host can't disconnect"; break;
	case 0x2C00: what="command sequence error"; break;
	case 0x2C03: what="current program area is not empty"; break;
	case 0x2C04: what="current program area is empty"; break;
	case 0x2F00: what="commands cleared by another initiator"; break;
	case 0x3001: what="can't read medium: unknown format"; break;
	case 0x3002: what="can't read medium: incompatible format"; break;
	case 0x3003: what="cleaning cartridge installed"; break;
	case 0x3004: what="can't write medium: unknown format"; break;
	case 0x3005: what="can't write medium: incompatible format"; break;
	case 0x3006: what="can't format medium: incompatible medium"; break;
	case 0x3007: what="cleaning failure"; break;
	case 0x3008: what="can't write: application code mismatch"; break;
	case 0x3009: what="current session not fixated for append"; break;
	case 0x3201: what="defect list update failure"; break;
	case 0x3400: what="enclosure failure"; break;
	case 0x3500: what="enclosure services failure"; break;
	case 0x3502: what="enclosure services unavailable"; break;
	case 0x3503: what="enclosure services transfer failure"; break;
	case 0x3504: what="enclosure services transfer refused"; break;
	case 0x3B0F: what="end of medium reached"; break;
	case 0x3F02: what="changed operating definition"; break;
	case 0x4100: what="data path failure (should use 40 NN)"; break;
	case 0x4A00: what="command phase error"; break;
	case 0x4B00: what="data phase error"; break;
	case 0x5100: what="erase failure"; break;
	case 0x5200: what="cartridge fault"; break;
	case 0x6300: what="end of user area encountered on this track"; break;
	case 0x6600: what="automatic document feeder cover up"; break;
	case 0x6601: what="automatic document feeder lift up"; break;
	case 0x6602: what="document jam in auto doc feeder"; break;
	case 0x6603: what="document miss feed auto in doc feeder"; break;
	case 0x6700: what="configuration failure"; break;
	case 0x6701: what="configuration of incapable LUN's failed"; break;
	case 0x6702: what="add logical unit failed"; break;
	case 0x6706: what="attachment of logical unit failed"; break;
	case 0x6707: what="creation of logical unit failed"; break;
	case 0x6900: what="data loss on logical unit"; break;
	case 0x6E00: what="command to logical unit failed"; break;
	case 0x7100: what="decompression exception long algorithm ID"; break;
	case 0x7204: what="empty or partially written reserved track"; break;
	case 0x7300: what="CD control error"; break;

	default:
		if (asc==0x40) {
			US_DEBUGP("%s: diagnostic failure on component"
			  " %02X\n", keystr, ascq);
			return;
		}
		if (asc==0x70) {
			US_DEBUGP("%s: decompression exception short"
			  " algorithm ID of %02X\n", keystr, ascq);
			return;
		}
		what = "(unknown ASC/ASCQ)";
	}

	US_DEBUGP("%s: %s\n", keystr, what);
}