Staging: rspiusb: clean rspiusb code

This first patch makes checkpatch happier
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rspiusb/rspiusb.c

@@ -39,7 +39,11 @@ static int debug;
 #endif
 /* Use our own dbg macro */
 #undef dbg
-#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg); } while (0)
+#define dbg(format, arg...) \
+	do { \
+		if (debug) \
+			printk(KERN_DEBUG __FILE__ ": " format "\n" , ##arg); \
+	} while (0)
 
 /* Version Information */
 #define DRIVER_VERSION "V1.0.1"
@@ -63,52 +67,58 @@ static DECLARE_MUTEX(disconnect_sem);
 
 /* Structure to hold all of our device specific stuff */
 struct device_extension {
-	struct usb_device *udev;	/* save off the usb device pointer */
-	struct usb_interface *interface;	/* the interface for this device */
-	unsigned char minor;	/* the starting minor number for this device */
+	struct usb_device *udev;	 /* save off the usb device pointer */
+	struct usb_interface *interface; /* the interface for this device */
+	unsigned char minor;		 /* the starting minor number
+					  * for this device
+					  */
 	size_t bulk_in_size_returned;
 	int bulk_in_byte_trk;
 	struct urb ***PixelUrb;
 	int frameIdx;
 	int urbIdx;
 	unsigned int *maplist_numPagesMapped;
-	int open;		/* if the port is open or not */
-	int present;		/* if the device is not disconnected */
-	int userBufMapped;	/* has the user buffer been mapped? */
-	struct scatterlist **sgl;	/* scatter-gather list for user buffer */
+	int open;		  /* if the port is open or not */
+	int present;		  /* if the device is not disconnected */
+	int userBufMapped;	  /* has the user buffer been mapped ? */
+	struct scatterlist **sgl; /* scatter-gather list for user buffer */
 	unsigned int *sgEntries;
 	struct kref kref;
 	int gotPixelData;
 	int pendingWrite;
 	char **pendedPixelUrbs;
-	int iama;		/*PIXIS or ST133 */
-	int num_frames;		/* the number of frames that will fit in the user buffer */
+	int iama;		 /* PIXIS or ST133 */
+	int num_frames;		 /* the number of frames that will fit
+				  * in the user buffer
+				  */
 	int active_frame;
 	unsigned long frameSize;
 	struct semaphore sem;
-	//FX2 specific endpoints
-	unsigned int hEP[8];
+	unsigned int hEP[8];	 /* FX2 specific endpoints */
 };
-#define to_pi_dev(d) container_of( d, struct device_extension, kref )
 
+#define to_pi_dev(d) container_of(d, struct device_extension, kref)
+
+/* Prototypes */
 static int MapUserBuffer(struct ioctl_struct *, struct device_extension *);
 static int UnMapUserBuffer(struct device_extension *);
 static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 		       unsigned long arg);
-static int piusb_output(struct ioctl_struct *, unsigned char *, int, struct device_extension *);
+static int piusb_output(struct ioctl_struct *, unsigned char *, int,
+		struct device_extension *);
 static struct usb_driver piusb_driver;
 
 /* table of devices that work with this driver */
 static struct usb_device_id pi_device_table[] = {
 	{USB_DEVICE(VENDOR_ID, ST133_PID)},
 	{USB_DEVICE(VENDOR_ID, PIXIS_PID)},
-	{0, }			/* Terminating entry */
+	{0, } /* Terminating entry */
 };
 
 MODULE_DEVICE_TABLE(usb, pi_device_table);
 
-static int lastErr = 0;
-static int errCnt = 0;
+static int lastErr;
+static int errCnt;
 
 static void piusb_delete(struct kref *kref)
 {
@@ -143,25 +153,29 @@ static int piusb_open(struct inode *inode, struct file *file)
 	}
 	dbg("Alternate Setting = %d", interface->num_altsetting);
 
-	pdx->frameIdx = pdx->urbIdx = 0;
+	pdx->bulk_in_size_returned = 0;
+	pdx->bulk_in_byte_trk = 0;
+	pdx->PixelUrb = NULL;
+	pdx->frameIdx = 0;
+	pdx->urbIdx = 0;
+	pdx->maplist_numPagesMapped = NULL;
+	pdx->userBufMapped = 0;
+	pdx->sgl = NULL;
+	pdx->sgEntries = NULL;
 	pdx->gotPixelData = 0;
 	pdx->pendingWrite = 0;
-	pdx->frameSize = 0;
+	pdx->pendedPixelUrbs = NULL;
 	pdx->num_frames = 0;
 	pdx->active_frame = 0;
-	pdx->bulk_in_byte_trk = 0;
-	pdx->userBufMapped = 0;
-	pdx->pendedPixelUrbs = NULL;
-	pdx->sgEntries = NULL;
-	pdx->sgl = NULL;
-	pdx->maplist_numPagesMapped = NULL;
-	pdx->PixelUrb = NULL;
-	pdx->bulk_in_size_returned = 0;
+	pdx->frameSize = 0;
+
 	/* increment our usage count for the device */
 	kref_get(&pdx->kref);
+
 	/* save our object in the file's private structure */
 	file->private_data = pdx;
-      exit_no_device:
+
+exit_no_device:
 	return retval;
 }
 
@@ -174,10 +188,13 @@ static int piusb_release(struct inode *inode, struct file *file)
 	pdx = (struct device_extension *)file->private_data;
 	if (pdx == NULL) {
 		dbg("%s - object is NULL", __func__);
-		return -ENODEV;
+		retval = -ENODEV;
+		goto object_null;
 	}
 	/* decrement the count on our device */
 	kref_put(&pdx->kref, piusb_delete);
+
+object_null:
 	return retval;
 }
 
@@ -206,9 +223,11 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	}
 	/* fill in your device specific stuff here */
 	if (_IOC_DIR(cmd) & _IOC_READ)
-		err = !access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd));
+		err = !access_ok(VERIFY_WRITE, (void __user *)arg,
+				_IOC_SIZE(cmd));
 	else if (_IOC_DIR(cmd) & _IOC_WRITE)
-		err = !access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
+		err = !access_ok(VERIFY_READ, (void __user *)arg,
+			       _IOC_SIZE(cmd));
 	if (err) {
 		dev_err(&pdx->udev->dev, "return with error = %d\n", err);
 		return -EFAULT;
@@ -227,50 +246,57 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 			dbg("FW Version returned from HW = %ld.%ld",
 			    (devRB >> 8), (devRB & 0xFF));
 		}
-		return devRB;
+		if (retval >= 0)
+			retval = (int)devRB;
+		return retval;
+
 	case PIUSB_SETVNDCMD:
 		if (copy_from_user
 		    (&ctrl, (void __user *)arg, sizeof(struct ioctl_struct)))
 			dev_err(&pdx->udev->dev, "copy_from_user failed\n");
-//            dbg( "%s %x", "Set Vendor Command = ",ctrl.cmd );
+		/* dbg( "%s %x", "Set Vendor Command = ",ctrl.cmd ); */
 		controlData = ctrl.pData[0];
 		controlData |= (ctrl.pData[1] << 8);
-//            dbg( "%s %d", "Vendor Data =",controlData );
-		retval = usb_control_msg(pdx->udev, usb_sndctrlpipe(pdx->udev, 0), ctrl.cmd, (USB_DIR_OUT | USB_TYPE_VENDOR),	/* | USB_RECIP_ENDPOINT), */
-					 controlData,
-					 0,
-					 &dummyCtlBuf, ctrl.numbytes, HZ * 10);
+		/* dbg( "%s %d", "Vendor Data =",controlData ); */
+		retval = usb_control_msg(pdx->udev,
+				usb_sndctrlpipe(pdx->udev, 0),
+				ctrl.cmd,
+				(USB_DIR_OUT | USB_TYPE_VENDOR
+				 /* | USB_RECIP_ENDPOINT */),
+				controlData, 0,
+				&dummyCtlBuf, ctrl.numbytes, HZ * 10);
 		return retval;
-		break;
+
 	case PIUSB_ISHIGHSPEED:
 		return ((pdx->udev->speed == USB_SPEED_HIGH) ? 1 : 0);
-		break;
+
 	case PIUSB_WRITEPIPE:
 		if (copy_from_user(&ctrl, (void __user *)arg, _IOC_SIZE(cmd)))
-			dev_err(&pdx->udev->dev, "copy_from_user WRITE_DUMMY failed\n");
+			dev_err(&pdx->udev->dev,
+					"copy_from_user WRITE_DUMMY failed\n");
 		if (!access_ok(VERIFY_READ, ctrl.pData, ctrl.numbytes)) {
 			dbg("can't access pData");
 			return 0;
 		}
-		piusb_output(&ctrl, ctrl.pData /*uBuf */ , ctrl.numbytes, pdx);
+		piusb_output(&ctrl, ctrl.pData /* uBuf */, ctrl.numbytes, pdx);
 		return ctrl.numbytes;
-		break;
+
 	case PIUSB_USERBUFFER:
 		if (copy_from_user
 		    (&ctrl, (void __user *)arg, sizeof(struct ioctl_struct)))
 			dev_err(&pdx->udev->dev, "copy_from_user failed\n");
-		return MapUserBuffer((struct ioctl_struct *) & ctrl, pdx);
-		break;
+		return MapUserBuffer((struct ioctl_struct *) &ctrl, pdx);
+
 	case PIUSB_UNMAP_USERBUFFER:
-		UnMapUserBuffer(pdx);
-		return 0;
-		break;
+		retval = UnMapUserBuffer(pdx);
+		return retval;
+
 	case PIUSB_READPIPE:
 		if (copy_from_user
 		    (&ctrl, (void __user *)arg, sizeof(struct ioctl_struct)))
 			dev_err(&pdx->udev->dev, "copy_from_user failed\n");
 		switch (ctrl.endpoint) {
-		case 0:	//ST133 Pixel Data or PIXIS IO
+		case 0:	/* ST133 Pixel Data or PIXIS IO */
 			if (pdx->iama == PIXIS_PID) {
 				unsigned int numToRead = 0;
 				unsigned int totalRead = 0;
@@ -286,21 +312,19 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 				if (copy_from_user(uBuf, ctrl.pData, numbytes))
 					dbg("copying ctrl.pData to dummyBuf failed");
 				do {
-					i = usb_bulk_msg(pdx->udev, pdx->hEP[ctrl.endpoint], (uBuf + totalRead), (numToRead > 64) ? 64 : numToRead, &numbytes, HZ * 10);	//EP0 can only handle 64 bytes at a time
+					i = usb_bulk_msg(pdx->udev, pdx->hEP[ctrl.endpoint], (uBuf + totalRead), (numToRead > 64) ? 64 : numToRead, &numbytes, HZ * 10);	/* EP0 can only handle 64 bytes at a time */
 					if (i) {
 						dbg("CMD = %s, Address = 0x%02X", ((uBuf[3] == 0x02) ? "WRITE" : "READ"), uBuf[1]);
 						dbg("Number of bytes Attempted to read = %d", (int)ctrl.numbytes);
 						dbg("Blocking ReadI/O Failed with status %d", i);
 						kfree(uBuf);
 						return -1;
-					} else {
-						dbg("Pixis EP0 Read %d bytes",
-						    numbytes);
-						totalRead += numbytes;
-						numToRead -= numbytes;
 					}
-				}
-				while (numToRead);
+					dbg("Pixis EP0 Read %d bytes",
+							numbytes);
+					totalRead += numbytes;
+					numToRead -= numbytes;
+				} while (numToRead);
 				memcpy(ctrl.pData, uBuf, totalRead);
 				dbg("Total Bytes Read from PIXIS EP0 = %d",
 				    totalRead);
@@ -311,34 +335,29 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 					dbg("copy_to_user failed in IORB");
 				kfree(uBuf);
 				return ctrl.numbytes;
-			} else	//ST133 Pixel Data
-			{
-				if (!pdx->gotPixelData)
-					return 0;
-				else {
-					pdx->gotPixelData = 0;
-					ctrl.numbytes =
-					    pdx->bulk_in_size_returned;
-					pdx->bulk_in_size_returned -=
-					    pdx->frameSize;
-					for (i = 0; i < pdx->maplist_numPagesMapped[pdx->active_frame]; i++)
-						SetPageDirty(pdx->sgl[pdx->active_frame][i].page_link);
-					pdx->active_frame =
-					    ((pdx->active_frame +
-					      1) % pdx->num_frames);
-					return ctrl.numbytes;
-				}
 			}
-			break;
-		case 1:	//ST133IO
-		case 4:	//PIXIS IO
+			/* ST133 Pixel Data */
+			if (!pdx->gotPixelData)
+				return 0;
+			pdx->gotPixelData = 0;
+			ctrl.numbytes = pdx->bulk_in_size_returned;
+			pdx->bulk_in_size_returned -= pdx->frameSize;
+			for (i = 0; i < pdx->maplist_numPagesMapped[pdx->active_frame]; i++)
+				SetPageDirty(pdx->sgl[pdx->active_frame][i].page_link);
+			pdx->active_frame = ((pdx->active_frame + 1)
+					% pdx->num_frames);
+			return ctrl.numbytes;
+
+		case 1:	/* ST133IO */
+			/* fall through */
+		case 4:	/* PIXIS IO */
 			uBuf = kmalloc(ctrl.numbytes, GFP_KERNEL);
 			if (!uBuf) {
 				dbg("Alloc for uBuf failed");
 				return 0;
 			}
 			numbytes = ctrl.numbytes;
-//                                      dbg( "numbytes to read = %d", numbytes );
+			/* dbg( "numbytes to read = %d", numbytes ); */
 			if (copy_from_user(uBuf, ctrl.pData, numbytes))
 				dbg("copying ctrl.pData to dummyBuf failed");
 			i = usb_bulk_msg(pdx->udev, pdx->hEP[ctrl.endpoint],
@@ -348,41 +367,37 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 				    i);
 				kfree(uBuf);
 				return -1;
-			} else {
-				ctrl.numbytes = numbytes;
-				memcpy(ctrl.pData, uBuf, numbytes);
-				if (copy_to_user
-				    ((struct ioctl_struct *) arg, &ctrl,
-				     sizeof(struct ioctl_struct)))
-					dbg("copy_to_user failed in IORB");
-				kfree(uBuf);
-				return ctrl.numbytes;
 			}
-			break;
-
-		case 2:	//PIXIS Ping
-		case 3:	//PIXIS Pong
+			ctrl.numbytes = numbytes;
+			memcpy(ctrl.pData, uBuf, numbytes);
+			if (copy_to_user((struct ioctl_struct *) arg, &ctrl,
+						sizeof(struct ioctl_struct)))
+				dbg("copy_to_user failed in IORB");
+			kfree(uBuf);
+			return ctrl.numbytes;
+
+		case 2:	/* PIXIS Ping */
+			/* fall through */
+		case 3:	/* PIXIS Pong */
 			if (!pdx->gotPixelData)
 				return 0;
-			else {
-				pdx->gotPixelData = 0;
-				ctrl.numbytes = pdx->bulk_in_size_returned;
-				pdx->bulk_in_size_returned -= pdx->frameSize;
-				for (i = 0;
-				     i <
-				     pdx->maplist_numPagesMapped[pdx->
-								 active_frame];
-				     i++)
-					SetPageDirty(pdx->sgl[pdx->active_frame][i].page_link);
-				pdx->active_frame =
-				    ((pdx->active_frame + 1) % pdx->num_frames);
-				return ctrl.numbytes;
-			}
+			pdx->gotPixelData = 0;
+			ctrl.numbytes = pdx->bulk_in_size_returned;
+			pdx->bulk_in_size_returned -= pdx->frameSize;
+			for (i = 0; i < pdx->maplist_numPagesMapped[pdx->active_frame]; i++)
+				SetPageDirty(pdx->sgl[pdx->active_frame][i].page_link);
+			pdx->active_frame =
+				((pdx->active_frame + 1) % pdx->num_frames);
+			return ctrl.numbytes;
+
+		default:
 			break;
 		}
 		break;
+
 	case PIUSB_WHATCAMERA:
 		return pdx->iama;
+
 	case PIUSB_SETFRAMESIZE:
 		dbg("PIUSB_SETFRAMESIZE");
 		if (copy_from_user
@@ -410,6 +425,7 @@ static int piusb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 			    kmalloc(sizeof(char *) * pdx->num_frames,
 				    GFP_KERNEL);
 		return 0;
+
 	default:
 		dbg("%s\n", "No IOCTL found");
 		break;
@@ -436,7 +452,7 @@ static void piusb_write_bulk_callback(struct urb *urb)
 			urb->transfer_buffer, urb->transfer_dma);
 }
 
-int piusb_output(struct ioctl_struct * io, unsigned char *uBuf, int len,
+int piusb_output(struct ioctl_struct *io, unsigned char *uBuf, int len,
 		 struct device_extension *pdx)
 {
 	struct urb *urb = NULL;
@@ -472,6 +488,7 @@ static int UnMapUserBuffer(struct device_extension *pdx)
 	int i = 0;
 	int k = 0;
 	unsigned int epAddr;
+
 	for (k = 0; k < pdx->num_frames; k++) {
 		dbg("Killing Urbs for Frame %d", k);
 		for (i = 0; i < pdx->sgEntries[k]; i++) {
@@ -485,23 +502,19 @@ static int UnMapUserBuffer(struct device_extension *pdx)
 	}
 
 	for (k = 0; k < pdx->num_frames; k++) {
-		if (pdx->iama == PIXIS_PID)	//if so, which EP should we map this frame to
-		{
-			if (k % 2)	//check to see if this should use EP4(PONG)
-			{
-				epAddr = pdx->hEP[3];	//PONG, odd frames
-			} else {
-				epAddr = pdx->hEP[2];	//PING, even frames and zero
-			}
-		} else		//ST133 only has 1 endpoint for Pixel data transfer
-		{
+		if (pdx->iama == PIXIS_PID)
+			/* which EP should we map this frame to ? */
+			/* PONG, odd frames: hEP[3] */
+			/* PING, even frames and zero hEP[2] */
+			epAddr = (k % 2) ? pdx->hEP[3] : pdx->hEP[2];
+		else
+			/* ST133 only has 1 endpoint for Pixel data transfer */
 			epAddr = pdx->hEP[0];
-		}
+
 		usb_buffer_unmap_sg(pdx->udev, epAddr, pdx->sgl[k],
 				    pdx->maplist_numPagesMapped[k]);
-		for (i = 0; i < pdx->maplist_numPagesMapped[k]; i++) {
+		for (i = 0; i < pdx->maplist_numPagesMapped[k]; i++)
 			page_cache_release(pdx->sgl[k][i].page_link);
-		}
 		kfree(pdx->sgl[k]);
 		kfree(pdx->PixelUrb[k]);
 		kfree(pdx->pendedPixelUrbs[k]);
@@ -509,6 +522,7 @@ static int UnMapUserBuffer(struct device_extension *pdx)
 		pdx->PixelUrb[k] = NULL;
 		pdx->pendedPixelUrbs[k] = NULL;
 	}
+
 	kfree(pdx->sgEntries);
 	vfree(pdx->maplist_numPagesMapped);
 	pdx->sgEntries = NULL;
@@ -519,6 +533,7 @@ static int UnMapUserBuffer(struct device_extension *pdx)
 	pdx->sgl = NULL;
 	pdx->pendedPixelUrbs = NULL;
 	pdx->PixelUrb = NULL;
+
 	return 0;
 }
 
@@ -539,26 +554,25 @@ static void piusb_readPIXEL_callback(struct urb *urb)
 		pdx->pendedPixelUrbs[pdx->frameIdx][pdx->urbIdx] = 0;
 	} else {
 		pdx->bulk_in_byte_trk += urb->actual_length;
-		{
-			i = usb_submit_urb(urb, GFP_ATOMIC);	//resubmit the URB
-			if (i) {
-				errCnt++;
-				if (i != lastErr) {
-					dbg("submit urb in callback failed with error code %d", i);
-					lastErr = i;
-				}
-			} else {
-				pdx->urbIdx++;	//point to next URB when we callback
-				if (pdx->bulk_in_byte_trk >= pdx->frameSize) {
-					pdx->bulk_in_size_returned =
-					    pdx->bulk_in_byte_trk;
-					pdx->bulk_in_byte_trk = 0;
-					pdx->gotPixelData = 1;
-					pdx->frameIdx =
-					    ((pdx->frameIdx +
-					      1) % pdx->num_frames);
-					pdx->urbIdx = 0;
-				}
+		i = usb_submit_urb(urb, GFP_ATOMIC);	/* resubmit the URB */
+		if (i) {
+			errCnt++;
+			if (i != lastErr) {
+				dbg("submit urb in callback failed "
+						"with error code %d", i);
+				lastErr = i;
+			}
+		} else {
+			pdx->urbIdx++; /* point to next URB when we callback */
+			if (pdx->bulk_in_byte_trk >= pdx->frameSize) {
+				pdx->bulk_in_size_returned =
+					pdx->bulk_in_byte_trk;
+				pdx->bulk_in_byte_trk = 0;
+				pdx->gotPixelData = 1;
+				pdx->frameIdx =
+					((pdx->frameIdx +
+					  1) % pdx->num_frames);
+				pdx->urbIdx = 0;
 			}
 		}
 	}
@@ -566,24 +580,37 @@ static void piusb_readPIXEL_callback(struct urb *urb)
 
 /* MapUserBuffer(
 	inputs:
-	struct ioctl_struct *io - structure containing user address, frame #, and size
+	struct ioctl_struct *io - structure containing user address,
+				frame #, and size
 	struct device_extension *pdx - the PIUSB device extension
+
 	returns:
 	int - status of the task
+
 	Notes:
-	MapUserBuffer maps a buffer passed down through an ioctl.  The user buffer is Page Aligned by the app
-	and then passed down.  The function get_free_pages(...) does the actual mapping of the buffer from user space to
-	kernel space.  From there a scatterlist is created from all the pages.  The next function called is to usb_buffer_map_sg
-	which allocated DMA addresses for each page, even coalescing them if possible.  The DMA address is placed in the scatterlist
-	structure.  The function returns the number of DMA addresses.  This may or may not be equal to the number of pages that
-	the user buffer uses.  We then build an URB for each DMA address and then submit them.
+	MapUserBuffer maps a buffer passed down through an ioctl.
+	The user buffer is Page Aligned by the app and then passed down.
+	The function get_free_pages(...) does the actual mapping of the buffer
+	from user space to kernel space.
+	From there a scatterlist is created from all the pages.
+	The next function called is to usb_buffer_map_sg which allocated
+	DMA addresses for each page, even coalescing them if possible.
+	The DMA address is placed in the scatterlist structure.
+	The function returns the number of DMA addresses.
+	This may or may not be equal to the number of pages that
+	the user buffer uses.
+	We then build an URB for each DMA address and then submit them.
+*/
+
+/*
+int MapUserBuffer(unsigned long uaddr, unsigned long numbytes,
+		unsigned long frameInfo, struct device_extension *pdx)
 */
-//int MapUserBuffer( unsigned long uaddr, unsigned long numbytes, unsigned long frameInfo, struct device_extension *pdx )
 static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 {
 	unsigned long uaddr;
 	unsigned long numbytes;
-	int frameInfo;		//which frame we're mapping
+	int frameInfo;	/* which frame we're mapping */
 	unsigned int epAddr = 0;
 	unsigned long count = 0;
 	int i = 0;
@@ -591,45 +618,45 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 	int err = 0;
 	struct page **maplist_p;
 	int numPagesRequired;
+
 	frameInfo = io->numFrames;
 	uaddr = (unsigned long)io->pData;
 	numbytes = io->numbytes;
 
-	if (pdx->iama == PIXIS_PID)	//if so, which EP should we map this frame to
-	{
-		if (frameInfo % 2)	//check to see if this should use EP4(PONG)
-		{
-			epAddr = pdx->hEP[3];	//PONG, odd frames
-		} else {
-			epAddr = pdx->hEP[2];	//PING, even frames and zero
-		}
+	if (pdx->iama == PIXIS_PID) {
+		/* which EP should we map this frame to ? */
+		/* PONG, odd frames: hEP[3] */
+		/* PING, even frames and zero hEP[2] */
+		epAddr = (frameInfo % 2) ? pdx->hEP[3] : pdx->hEP[2];
 		dbg("Pixis Frame #%d: EP=%d", frameInfo,
 		    (epAddr == pdx->hEP[2]) ? 2 : 4);
-	} else			//ST133 only has 1 endpoint for Pixel data transfer
-	{
+	} else { /* ST133 only has 1 endpoint for Pixel data transfer */
 		epAddr = pdx->hEP[0];
 		dbg("ST133 Frame #%d: EP=2", frameInfo);
 	}
 	count = numbytes;
 	dbg("UserAddress = 0x%08lX", uaddr);
 	dbg("numbytes = %d", (int)numbytes);
-	//number of pages to map the entire user space DMA buffer
+
+	/* number of pages to map the entire user space DMA buffer */
 	numPagesRequired =
 	    ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
 	dbg("Number of pages needed = %d", numPagesRequired);
-	maplist_p = vmalloc(numPagesRequired * sizeof(struct page));	//, GFP_ATOMIC);
+	maplist_p = vmalloc(numPagesRequired * sizeof(struct page));
 	if (!maplist_p) {
 		dbg("Can't Allocate Memory for maplist_p");
 		return -ENOMEM;
 	}
-	//map the user buffer to kernel memory
+
+	/* map the user buffer to kernel memory */
 	down_write(&current->mm->mmap_sem);
-	pdx->maplist_numPagesMapped[frameInfo] = get_user_pages(current, current->mm, (uaddr & PAGE_MASK), numPagesRequired, WRITE, 0,	//Don't Force
-								maplist_p,
-								NULL);
+	pdx->maplist_numPagesMapped[frameInfo] = get_user_pages(current,
+			current->mm, (uaddr & PAGE_MASK), numPagesRequired,
+			WRITE, 0 /* Don't Force*/, maplist_p, NULL);
 	up_write(&current->mm->mmap_sem);
 	dbg("Number of pages mapped = %d",
 	    pdx->maplist_numPagesMapped[frameInfo]);
+
 	for (i = 0; i < pdx->maplist_numPagesMapped[frameInfo]; i++)
 		flush_dcache_page(maplist_p[i]);
 	if (!pdx->maplist_numPagesMapped[frameInfo]) {
@@ -637,7 +664,10 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 		vfree(maplist_p);
 		return -ENOMEM;
 	}
-	//need to create a scatterlist that spans each frame that can fit into the mapped buffer
+
+	/* need to create a scatterlist that spans each frame
+	 * that can fit into the mapped buffer
+	 */
 	pdx->sgl[frameInfo] =
 	    kmalloc((pdx->maplist_numPagesMapped[frameInfo] *
 		     sizeof(struct scatterlist)), GFP_ATOMIC);
@@ -657,7 +687,7 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 			pdx->sgl[frameInfo][k].page_link = maplist_p[k];
 			pdx->sgl[frameInfo][k].length =
 			    (count < PAGE_SIZE) ? count : PAGE_SIZE;
-			count -= PAGE_SIZE;	//example had PAGE_SIZE here;
+			count -= PAGE_SIZE; /* example had PAGE_SIZE here */
 		}
 	} else {
 		pdx->sgl[frameInfo][0].length = count;
@@ -668,7 +698,8 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 	dbg("number of sgEntries = %d", pdx->sgEntries[frameInfo]);
 	pdx->userBufMapped = 1;
 	vfree(maplist_p);
-	//Create and Send the URB's for each s/g entry
+
+	/* Create and Send the URB's for each s/g entry */
 	pdx->PixelUrb[frameInfo] =
 	    kmalloc(pdx->sgEntries[frameInfo] * sizeof(struct urb *),
 		    GFP_KERNEL);
@@ -677,7 +708,8 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 		return -ENOMEM;
 	}
 	for (i = 0; i < pdx->sgEntries[frameInfo]; i++) {
-		pdx->PixelUrb[frameInfo][i] = usb_alloc_urb(0, GFP_KERNEL);	//0 because we're using BULK transfers
+		/* 0 iso packets because we're using BULK transfers */
+		pdx->PixelUrb[frameInfo][i] = usb_alloc_urb(0, GFP_KERNEL);
 		usb_fill_bulk_urb(pdx->PixelUrb[frameInfo][i],
 				  pdx->udev,
 				  epAddr,
@@ -691,7 +723,8 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 		pdx->PixelUrb[frameInfo][i]->transfer_flags =
 		    URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT;
 	}
-	pdx->PixelUrb[frameInfo][--i]->transfer_flags &= ~URB_NO_INTERRUPT;	//only interrupt when last URB completes
+	/* only interrupt when last URB completes */
+	pdx->PixelUrb[frameInfo][--i]->transfer_flags &= ~URB_NO_INTERRUPT;
 	pdx->pendedPixelUrbs[frameInfo] =
 	    kmalloc((pdx->sgEntries[frameInfo] * sizeof(char)), GFP_KERNEL);
 	if (!pdx->pendedPixelUrbs[frameInfo])
@@ -702,13 +735,13 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx)
 			dbg("%s %d\n", "submit urb error =", err);
 			pdx->pendedPixelUrbs[frameInfo][i] = 0;
 			return err;
-		} else
-			pdx->pendedPixelUrbs[frameInfo][i] = 1;;
+		}
+		pdx->pendedPixelUrbs[frameInfo][i] = 1;
 	}
 	return 0;
 }
 
-static struct file_operations piusb_fops = {
+static const struct file_operations piusb_fops = {
 	.owner = THIS_MODULE,
 	.ioctl = piusb_ioctl,
 	.open = piusb_open,
@@ -751,9 +784,9 @@ static int piusb_probe(struct usb_interface *interface,
 	/* See if the device offered us matches what we can accept */
 	if ((pdx->udev->descriptor.idVendor != VENDOR_ID)
 	    || ((pdx->udev->descriptor.idProduct != PIXIS_PID)
-		&& (pdx->udev->descriptor.idProduct != ST133_PID))) {
+		&& (pdx->udev->descriptor.idProduct != ST133_PID)))
 		return -ENODEV;
-	}
+
 	pdx->iama = pdx->udev->descriptor.idProduct;
 
 	if (debug) {
@@ -807,7 +840,7 @@ static int piusb_probe(struct usb_interface *interface,
 	dbg("PI USB2.0 device now attached to piusb-%d", pdx->minor);
 	return 0;
 
-      error:
+error:
 	if (pdx)
 		kref_put(&pdx->kref, piusb_delete);
 	return retval;
@@ -828,12 +861,17 @@ static void piusb_disconnect(struct usb_interface *interface)
 {
 	struct device_extension *pdx;
 	int minor = interface->minor;
+
 	lock_kernel();
+
 	pdx = usb_get_intfdata(interface);
 	usb_set_intfdata(interface, NULL);
+
 	/* give back our minor */
 	usb_deregister_dev(interface, &piusb_class);
+
 	unlock_kernel();
+
 	/* prevent device read, write and ioctl */
 	pdx->present = 0;
 	kref_put(&pdx->kref, piusb_delete);
@@ -853,16 +891,20 @@ static struct usb_driver piusb_driver = {
 static int __init piusb_init(void)
 {
 	int result;
+
+	lastErr = 0;
+	errCnt = 0;
+
 	/* register this driver with the USB subsystem */
 	result = usb_register(&piusb_driver);
-	if (result) {
+	if (result)
 		printk(KERN_ERR KBUILD_MODNAME
-		       ": usb_register failed. Error number %d\n", result);
-		return result;
-	}
-	printk(KERN_INFO KBUILD_MODNAME ":%s: %s\n", DRIVER_DESC,
-	       DRIVER_VERSION);
-	return 0;
+				": usb_register failed. Error number %d\n",
+				result);
+	else
+		printk(KERN_INFO KBUILD_MODNAME ":%s: %s\n", DRIVER_DESC,
+				DRIVER_VERSION);
+	return result;
 }
 
 /**

drivers/staging/rspiusb/rspiusb.h

@@ -3,20 +3,28 @@
 
 #define PIUSB_MAGIC		'm'
 #define PIUSB_IOCTL_BASE	192
-#define PIUSB_GETVNDCMD		_IOR(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 1, struct ioctl_struct)
-#define PIUSB_SETVNDCMD		_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 2, struct ioctl_struct)
-#define PIUSB_WRITEPIPE		_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 3, struct ioctl_struct)
-#define PIUSB_READPIPE		_IOR(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 4, struct ioctl_struct)
-#define PIUSB_SETFRAMESIZE	_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 5, struct ioctl_struct)
-#define PIUSB_WHATCAMERA	_IO(PIUSB_MAGIC,  PIUSB_IOCTL_BASE + 6)
-#define PIUSB_USERBUFFER	_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 7, struct ioctl_struct)
-#define PIUSB_ISHIGHSPEED	_IO(PIUSB_MAGIC,  PIUSB_IOCTL_BASE + 8)
-#define PIUSB_UNMAP_USERBUFFER	_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + 9, struct ioctl_struct)
+
+#define PIUSB_IOR(offset) \
+	_IOR(PIUSB_MAGIC, PIUSB_IOCTL_BASE + offset, struct ioctl_struct)
+#define PIUSB_IOW(offset) \
+	_IOW(PIUSB_MAGIC, PIUSB_IOCTL_BASE + offset, struct ioctl_struct)
+#define PIUSB_IO(offset) \
+	_IO(PIUSB_MAGIC, PIUSB_IOCTL_BASE + offset)
+
+#define PIUSB_GETVNDCMD		PIUSB_IOR(1)
+#define PIUSB_SETVNDCMD		PIUSB_IOW(2)
+#define PIUSB_WRITEPIPE		PIUSB_IOW(3)
+#define PIUSB_READPIPE		PIUSB_IOR(4)
+#define PIUSB_SETFRAMESIZE	PIUSB_IOW(5)
+#define PIUSB_WHATCAMERA	PIUSB_IO(6)
+#define PIUSB_USERBUFFER	PIUSB_IOW(7)
+#define PIUSB_ISHIGHSPEED	PIUSB_IO(8)
+#define PIUSB_UNMAP_USERBUFFER	PIUSB_IOW(9)
 
 struct ioctl_struct {
 	unsigned char cmd;
 	unsigned long numbytes;
-	unsigned char dir;	//1=out;0=in
+	unsigned char dir;	/* 1=out; 0=in */
 	int endpoint;
 	int numFrames;
 	unsigned char *pData;