diff options
author | Richard Genoud <richard.genoud@gmail.com> | 2009-05-17 13:06:30 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-19 11:00:54 -0700 |
commit | f2d46e248a8a825506c21f972fff11e423ff1eea (patch) | |
tree | cf706c91c48d8431346771c0b5a36ef9bb621fa0 /drivers/staging/rspiusb/rspiusb.c | |
parent | 6546f08d21921ee13b6265493bebcff750090791 (diff) |
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>
Diffstat (limited to 'drivers/staging/rspiusb/rspiusb.c')
-rw-r--r-- | drivers/staging/rspiusb/rspiusb.c | 406 |
1 files changed, 224 insertions, 182 deletions
diff --git a/drivers/staging/rspiusb/rspiusb.c b/drivers/staging/rspiusb/rspiusb.c index b2339724a31..72241f28bde 100644 --- a/drivers/staging/rspiusb/rspiusb.c +++ b/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(¤t->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(¤t->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; } /** |