2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2, or (at your option)
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/list.h>
20 #include <linux/slab.h>
21 #include <linux/module.h>
23 #include <linux/vmalloc.h>
24 #include <linux/init.h>
25 #include <linux/spinlock.h>
32 #define virt_to_page(v) MAP_NR(v) /* Kernels 2.2.x */
35 static int video_nr = -1;
36 module_param(video_nr, int, 0);
41 static void usbvideo_Disconnect(struct usb_interface *intf);
42 static void usbvideo_CameraRelease(struct uvd *uvd);
44 static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
45 unsigned int cmd, unsigned long arg);
46 static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma);
47 static int usbvideo_v4l_open(struct inode *inode, struct file *file);
48 static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
49 size_t count, loff_t *ppos);
50 static int usbvideo_v4l_close(struct inode *inode, struct file *file);
52 static int usbvideo_StartDataPump(struct uvd *uvd);
53 static void usbvideo_StopDataPump(struct uvd *uvd);
54 static int usbvideo_GetFrame(struct uvd *uvd, int frameNum);
55 static int usbvideo_NewFrame(struct uvd *uvd, int framenum);
56 static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
57 struct usbvideo_frame *frame);
59 /*******************************/
60 /* Memory management functions */
61 /*******************************/
62 static void *usbvideo_rvmalloc(unsigned long size)
67 size = PAGE_ALIGN(size);
68 mem = vmalloc_32(size);
72 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
73 adr = (unsigned long) mem;
75 SetPageReserved(vmalloc_to_page((void *)adr));
83 static void usbvideo_rvfree(void *mem, unsigned long size)
90 adr = (unsigned long) mem;
91 while ((long) size > 0) {
92 ClearPageReserved(vmalloc_to_page((void *)adr));
99 static void RingQueue_Initialize(struct RingQueue *rq)
102 init_waitqueue_head(&rq->wqh);
105 static void RingQueue_Allocate(struct RingQueue *rq, int rqLen)
107 /* Make sure the requested size is a power of 2 and
108 round up if necessary. This allows index wrapping
109 using masks rather than modulo */
117 if(rqLen != 1 << (i-1))
122 rq->queue = usbvideo_rvmalloc(rq->length);
123 assert(rq->queue != NULL);
126 static int RingQueue_IsAllocated(const struct RingQueue *rq)
130 return (rq->queue != NULL) && (rq->length > 0);
133 static void RingQueue_Free(struct RingQueue *rq)
136 if (RingQueue_IsAllocated(rq)) {
137 usbvideo_rvfree(rq->queue, rq->length);
143 int RingQueue_Dequeue(struct RingQueue *rq, unsigned char *dst, int len)
150 rql = RingQueue_GetLength(rq);
154 /* Clip requested length to available data */
159 if(rq->ri > rq->wi) {
160 /* Read data from tail */
161 int read = (toread < (rq->length - rq->ri)) ? toread : rq->length - rq->ri;
162 memcpy(dst, rq->queue + rq->ri, read);
165 rq->ri = (rq->ri + read) & (rq->length-1);
168 /* Read data from head */
169 memcpy(dst, rq->queue + rq->ri, toread);
170 rq->ri = (rq->ri + toread) & (rq->length-1);
175 EXPORT_SYMBOL(RingQueue_Dequeue);
177 int RingQueue_Enqueue(struct RingQueue *rq, const unsigned char *cdata, int n)
182 assert(cdata != NULL);
183 assert(rq->length > 0);
187 /* Calculate the largest chunk that fits the tail of the ring */
188 q_avail = rq->length - rq->wi;
191 q_avail = rq->length;
198 memcpy(rq->queue + rq->wi, cdata, m);
199 RING_QUEUE_ADVANCE_INDEX(rq, wi, m);
207 EXPORT_SYMBOL(RingQueue_Enqueue);
209 static void RingQueue_InterruptibleSleepOn(struct RingQueue *rq)
212 interruptible_sleep_on(&rq->wqh);
215 void RingQueue_WakeUpInterruptible(struct RingQueue *rq)
218 if (waitqueue_active(&rq->wqh))
219 wake_up_interruptible(&rq->wqh);
222 EXPORT_SYMBOL(RingQueue_WakeUpInterruptible);
224 void RingQueue_Flush(struct RingQueue *rq)
231 EXPORT_SYMBOL(RingQueue_Flush);
235 * usbvideo_VideosizeToString()
237 * This procedure converts given videosize value to readable string.
240 * 07-Aug-2000 Created.
241 * 19-Oct-2000 Reworked for usbvideo module.
243 static void usbvideo_VideosizeToString(char *buf, int bufLen, videosize_t vs)
248 n = 1 + sprintf(tmp, "%ldx%ld", VIDEOSIZE_X(vs), VIDEOSIZE_Y(vs));
249 assert(n < sizeof(tmp));
250 if ((buf == NULL) || (bufLen < n))
251 err("usbvideo_VideosizeToString: buffer is too small.");
253 memmove(buf, tmp, n);
257 * usbvideo_OverlayChar()
260 * 01-Feb-2000 Created.
262 static void usbvideo_OverlayChar(struct uvd *uvd, struct usbvideo_frame *frame,
263 int x, int y, int ch)
265 static const unsigned short digits[16] = {
283 unsigned short digit;
286 if ((uvd == NULL) || (frame == NULL))
289 if (ch >= '0' && ch <= '9')
291 else if (ch >= 'A' && ch <= 'F')
292 ch = 10 + (ch - 'A');
293 else if (ch >= 'a' && ch <= 'f')
294 ch = 10 + (ch - 'a');
299 for (iy=0; iy < 5; iy++) {
300 for (ix=0; ix < 3; ix++) {
301 if (digit & 0x8000) {
302 if (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24)) {
303 /* TODO */ RGB24_PUTPIXEL(frame, x+ix, y+iy, 0xFF, 0xFF, 0xFF);
312 * usbvideo_OverlayString()
315 * 01-Feb-2000 Created.
317 static void usbvideo_OverlayString(struct uvd *uvd, struct usbvideo_frame *frame,
318 int x, int y, const char *str)
321 usbvideo_OverlayChar(uvd, frame, x, y, *str);
323 x += 4; /* 3 pixels character + 1 space */
328 * usbvideo_OverlayStats()
330 * Overlays important debugging information.
333 * 01-Feb-2000 Created.
335 static void usbvideo_OverlayStats(struct uvd *uvd, struct usbvideo_frame *frame)
337 const int y_diff = 8;
340 long i, j, barLength;
341 const int qi_x1 = 60, qi_y1 = 10;
342 const int qi_x2 = VIDEOSIZE_X(frame->request) - 10, qi_h = 10;
344 /* Call the user callback, see if we may proceed after that */
345 if (VALID_CALLBACK(uvd, overlayHook)) {
346 if (GET_CALLBACK(uvd, overlayHook)(uvd, frame) < 0)
351 * We draw a (mostly) hollow rectangle with qi_xxx coordinates.
352 * Left edge symbolizes the queue index 0; right edge symbolizes
353 * the full capacity of the queue.
355 barLength = qi_x2 - qi_x1 - 2;
356 if ((barLength > 10) && (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24))) {
357 /* TODO */ long u_lo, u_hi, q_used;
358 long m_ri, m_wi, m_lo, m_hi;
361 * Determine fill zones (used areas of the queue):
362 * 0 xxxxxxx u_lo ...... uvd->dp.ri xxxxxxxx u_hi ..... uvd->dp.length
364 * if u_lo < 0 then there is no first filler.
367 q_used = RingQueue_GetLength(&uvd->dp);
368 if ((uvd->dp.ri + q_used) >= uvd->dp.length) {
369 u_hi = uvd->dp.length;
370 u_lo = (q_used + uvd->dp.ri) & (uvd->dp.length-1);
372 u_hi = (q_used + uvd->dp.ri);
376 /* Convert byte indices into screen units */
377 m_ri = qi_x1 + ((barLength * uvd->dp.ri) / uvd->dp.length);
378 m_wi = qi_x1 + ((barLength * uvd->dp.wi) / uvd->dp.length);
379 m_lo = (u_lo > 0) ? (qi_x1 + ((barLength * u_lo) / uvd->dp.length)) : -1;
380 m_hi = qi_x1 + ((barLength * u_hi) / uvd->dp.length);
382 for (j=qi_y1; j < (qi_y1 + qi_h); j++) {
383 for (i=qi_x1; i < qi_x2; i++) {
384 /* Draw border lines */
385 if ((j == qi_y1) || (j == (qi_y1 + qi_h - 1)) ||
386 (i == qi_x1) || (i == (qi_x2 - 1))) {
387 RGB24_PUTPIXEL(frame, i, j, 0xFF, 0xFF, 0xFF);
390 /* For all other points the Y coordinate does not matter */
391 if ((i >= m_ri) && (i <= (m_ri + 3))) {
392 RGB24_PUTPIXEL(frame, i, j, 0x00, 0xFF, 0x00);
393 } else if ((i >= m_wi) && (i <= (m_wi + 3))) {
394 RGB24_PUTPIXEL(frame, i, j, 0xFF, 0x00, 0x00);
395 } else if ((i < m_lo) || ((i > m_ri) && (i < m_hi)))
396 RGB24_PUTPIXEL(frame, i, j, 0x00, 0x00, 0xFF);
401 sprintf(tmp, "%8lx", uvd->stats.frame_num);
402 usbvideo_OverlayString(uvd, frame, x, y, tmp);
405 sprintf(tmp, "%8lx", uvd->stats.urb_count);
406 usbvideo_OverlayString(uvd, frame, x, y, tmp);
409 sprintf(tmp, "%8lx", uvd->stats.urb_length);
410 usbvideo_OverlayString(uvd, frame, x, y, tmp);
413 sprintf(tmp, "%8lx", uvd->stats.data_count);
414 usbvideo_OverlayString(uvd, frame, x, y, tmp);
417 sprintf(tmp, "%8lx", uvd->stats.header_count);
418 usbvideo_OverlayString(uvd, frame, x, y, tmp);
421 sprintf(tmp, "%8lx", uvd->stats.iso_skip_count);
422 usbvideo_OverlayString(uvd, frame, x, y, tmp);
425 sprintf(tmp, "%8lx", uvd->stats.iso_err_count);
426 usbvideo_OverlayString(uvd, frame, x, y, tmp);
429 sprintf(tmp, "%8x", uvd->vpic.colour);
430 usbvideo_OverlayString(uvd, frame, x, y, tmp);
433 sprintf(tmp, "%8x", uvd->vpic.hue);
434 usbvideo_OverlayString(uvd, frame, x, y, tmp);
437 sprintf(tmp, "%8x", uvd->vpic.brightness >> 8);
438 usbvideo_OverlayString(uvd, frame, x, y, tmp);
441 sprintf(tmp, "%8x", uvd->vpic.contrast >> 12);
442 usbvideo_OverlayString(uvd, frame, x, y, tmp);
445 sprintf(tmp, "%8d", uvd->vpic.whiteness >> 8);
446 usbvideo_OverlayString(uvd, frame, x, y, tmp);
451 * usbvideo_ReportStatistics()
453 * This procedure prints packet and transfer statistics.
456 * 14-Jan-2000 Corrected default multiplier.
458 static void usbvideo_ReportStatistics(const struct uvd *uvd)
460 if ((uvd != NULL) && (uvd->stats.urb_count > 0)) {
461 unsigned long allPackets, badPackets, goodPackets, percent;
462 allPackets = uvd->stats.urb_count * CAMERA_URB_FRAMES;
463 badPackets = uvd->stats.iso_skip_count + uvd->stats.iso_err_count;
464 goodPackets = allPackets - badPackets;
465 /* Calculate percentage wisely, remember integer limits */
466 assert(allPackets != 0);
467 if (goodPackets < (((unsigned long)-1)/100))
468 percent = (100 * goodPackets) / allPackets;
470 percent = goodPackets / (allPackets / 100);
471 info("Packet Statistics: Total=%lu. Empty=%lu. Usage=%lu%%",
472 allPackets, badPackets, percent);
473 if (uvd->iso_packet_len > 0) {
474 unsigned long allBytes, xferBytes;
475 char multiplier = ' ';
476 allBytes = allPackets * uvd->iso_packet_len;
477 xferBytes = uvd->stats.data_count;
478 assert(allBytes != 0);
479 if (xferBytes < (((unsigned long)-1)/100))
480 percent = (100 * xferBytes) / allBytes;
482 percent = xferBytes / (allBytes / 100);
483 /* Scale xferBytes for easy reading */
484 if (xferBytes > 10*1024) {
487 if (xferBytes > 10*1024) {
490 if (xferBytes > 10*1024) {
493 if (xferBytes > 10*1024) {
500 info("Transfer Statistics: Transferred=%lu%cB Usage=%lu%%",
501 xferBytes, multiplier, percent);
507 * usbvideo_TestPattern()
509 * Procedure forms a test pattern (yellow grid on blue background).
512 * fullframe: if TRUE then entire frame is filled, otherwise the procedure
513 * continues from the current scanline.
514 * pmode 0: fill the frame with solid blue color (like on VCR or TV)
515 * 1: Draw a colored grid
518 * 01-Feb-2000 Created.
520 void usbvideo_TestPattern(struct uvd *uvd, int fullframe, int pmode)
522 struct usbvideo_frame *frame;
525 static int num_pass = 0;
528 err("%s: uvd == NULL", __FUNCTION__);
531 if ((uvd->curframe < 0) || (uvd->curframe >= USBVIDEO_NUMFRAMES)) {
532 err("%s: uvd->curframe=%d.", __FUNCTION__, uvd->curframe);
536 /* Grab the current frame */
537 frame = &uvd->frame[uvd->curframe];
539 /* Optionally start at the beginning */
542 frame->seqRead_Length = 0;
545 { /* For debugging purposes only */
547 usbvideo_VideosizeToString(tmp, sizeof(tmp), frame->request);
548 info("testpattern: frame=%s", tmp);
551 /* Form every scan line */
552 for (; frame->curline < VIDEOSIZE_Y(frame->request); frame->curline++) {
554 unsigned char *f = frame->data +
555 (VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL * frame->curline);
556 for (i=0; i < VIDEOSIZE_X(frame->request); i++) {
557 unsigned char cb=0x80;
558 unsigned char cg = 0;
559 unsigned char cr = 0;
562 if (frame->curline % 32 == 0)
563 cb = 0, cg = cr = 0xFF;
564 else if (i % 32 == 0) {
565 if (frame->curline % 32 == 1)
567 cb = 0, cg = cr = 0xFF;
569 cb = ((num_cell*7) + num_pass) & 0xFF;
570 cg = ((num_cell*5) + num_pass*2) & 0xFF;
571 cr = ((num_cell*3) + num_pass*3) & 0xFF;
574 /* Just the blue screen */
584 frame->frameState = FrameState_Done;
585 frame->seqRead_Length += scan_length;
588 /* We do this unconditionally, regardless of FLAGS_OVERLAY_STATS */
589 usbvideo_OverlayStats(uvd, frame);
592 EXPORT_SYMBOL(usbvideo_TestPattern);
599 * A debugging tool. Prints hex dumps.
602 * 29-Jul-2000 Added printing of offsets.
604 void usbvideo_HexDump(const unsigned char *data, int len)
606 const int bytes_per_line = 32;
607 char tmp[128]; /* 32*3 + 5 */
610 for (i=k=0; len > 0; i++, len--) {
611 if (i > 0 && ((i % bytes_per_line) == 0)) {
615 if ((i % bytes_per_line) == 0)
616 k += sprintf(&tmp[k], "%04x: ", i);
617 k += sprintf(&tmp[k], "%02x ", data[i]);
623 EXPORT_SYMBOL(usbvideo_HexDump);
627 /* ******************************************************************** */
629 /* XXX: this piece of crap really wants some error handling.. */
630 static int usbvideo_ClientIncModCount(struct uvd *uvd)
633 err("%s: uvd == NULL", __FUNCTION__);
636 if (uvd->handle == NULL) {
637 err("%s: uvd->handle == NULL", __FUNCTION__);
640 if (!try_module_get(uvd->handle->md_module)) {
641 err("%s: try_module_get() == 0", __FUNCTION__);
647 static void usbvideo_ClientDecModCount(struct uvd *uvd)
650 err("%s: uvd == NULL", __FUNCTION__);
653 if (uvd->handle == NULL) {
654 err("%s: uvd->handle == NULL", __FUNCTION__);
657 if (uvd->handle->md_module == NULL) {
658 err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
661 module_put(uvd->handle->md_module);
664 int usbvideo_register(
665 struct usbvideo **pCams,
668 const char *driverName,
669 const struct usbvideo_cb *cbTbl,
671 const struct usb_device_id *id_table)
673 struct usbvideo *cams;
674 int i, base_size, result;
676 /* Check parameters for sanity */
677 if ((num_cams <= 0) || (pCams == NULL) || (cbTbl == NULL)) {
678 err("%s: Illegal call", __FUNCTION__);
682 /* Check registration callback - must be set! */
683 if (cbTbl->probe == NULL) {
684 err("%s: probe() is required!", __FUNCTION__);
688 base_size = num_cams * sizeof(struct uvd) + sizeof(struct usbvideo);
689 cams = kzalloc(base_size, GFP_KERNEL);
691 err("Failed to allocate %d. bytes for usbvideo struct", base_size);
694 dbg("%s: Allocated $%p (%d. bytes) for %d. cameras",
695 __FUNCTION__, cams, base_size, num_cams);
697 /* Copy callbacks, apply defaults for those that are not set */
698 memmove(&cams->cb, cbTbl, sizeof(cams->cb));
699 if (cams->cb.getFrame == NULL)
700 cams->cb.getFrame = usbvideo_GetFrame;
701 if (cams->cb.disconnect == NULL)
702 cams->cb.disconnect = usbvideo_Disconnect;
703 if (cams->cb.startDataPump == NULL)
704 cams->cb.startDataPump = usbvideo_StartDataPump;
705 if (cams->cb.stopDataPump == NULL)
706 cams->cb.stopDataPump = usbvideo_StopDataPump;
708 cams->num_cameras = num_cams;
709 cams->cam = (struct uvd *) &cams[1];
710 cams->md_module = md;
711 mutex_init(&cams->lock); /* to 1 == available */
713 for (i = 0; i < num_cams; i++) {
714 struct uvd *up = &cams->cam[i];
718 /* Allocate user_data separately because of kmalloc's limits */
720 up->user_size = num_cams * num_extra;
721 up->user_data = kmalloc(up->user_size, GFP_KERNEL);
722 if (up->user_data == NULL) {
723 err("%s: Failed to allocate user_data (%d. bytes)",
724 __FUNCTION__, up->user_size);
726 up = &cams->cam[--i];
727 kfree(up->user_data);
732 dbg("%s: Allocated cams[%d].user_data=$%p (%d. bytes)",
733 __FUNCTION__, i, up->user_data, up->user_size);
738 * Register ourselves with USB stack.
740 strcpy(cams->drvName, (driverName != NULL) ? driverName : "Unknown");
741 cams->usbdrv.name = cams->drvName;
742 cams->usbdrv.probe = cams->cb.probe;
743 cams->usbdrv.disconnect = cams->cb.disconnect;
744 cams->usbdrv.id_table = id_table;
747 * Update global handle to usbvideo. This is very important
748 * because probe() can be called before usb_register() returns.
749 * If the handle is not yet updated then the probe() will fail.
752 result = usb_register(&cams->usbdrv);
754 for (i = 0; i < num_cams; i++) {
755 struct uvd *up = &cams->cam[i];
756 kfree(up->user_data);
764 EXPORT_SYMBOL(usbvideo_register);
767 * usbvideo_Deregister()
769 * Procedure frees all usbvideo and user data structures. Be warned that
770 * if you had some dynamically allocated components in ->user field then
771 * you should free them before calling here.
773 void usbvideo_Deregister(struct usbvideo **pCams)
775 struct usbvideo *cams;
779 err("%s: pCams == NULL", __FUNCTION__);
784 err("%s: cams == NULL", __FUNCTION__);
788 dbg("%s: Deregistering %s driver.", __FUNCTION__, cams->drvName);
789 usb_deregister(&cams->usbdrv);
791 dbg("%s: Deallocating cams=$%p (%d. cameras)", __FUNCTION__, cams, cams->num_cameras);
792 for (i=0; i < cams->num_cameras; i++) {
793 struct uvd *up = &cams->cam[i];
796 if (up->user_data != NULL) {
797 if (up->user_size <= 0)
800 if (up->user_size > 0)
804 err("%s: Warning: user_data=$%p user_size=%d.",
805 __FUNCTION__, up->user_data, up->user_size);
807 dbg("%s: Freeing %d. $%p->user_data=$%p",
808 __FUNCTION__, i, up, up->user_data);
809 kfree(up->user_data);
812 /* Whole array was allocated in one chunk */
813 dbg("%s: Freed %d uvd structures",
814 __FUNCTION__, cams->num_cameras);
819 EXPORT_SYMBOL(usbvideo_Deregister);
822 * usbvideo_Disconnect()
824 * This procedure stops all driver activity. Deallocation of
825 * the interface-private structure (pointed by 'ptr') is done now
826 * (if we don't have any open files) or later, when those files
827 * are closed. After that driver should be removable.
829 * This code handles surprise removal. The uvd->user is a counter which
830 * increments on open() and decrements on close(). If we see here that
831 * this counter is not 0 then we have a client who still has us opened.
832 * We set uvd->remove_pending flag as early as possible, and after that
833 * all access to the camera will gracefully fail. These failures should
834 * prompt client to (eventually) close the video device, and then - in
835 * usbvideo_v4l_close() - we decrement uvd->uvd_used and usage counter.
838 * 22-Jan-2000 Added polling of MOD_IN_USE to delay removal until all users gone.
839 * 27-Jan-2000 Reworked to allow pending disconnects; see xxx_close()
840 * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
841 * 19-Oct-2000 Moved to usbvideo module.
843 static void usbvideo_Disconnect(struct usb_interface *intf)
845 struct uvd *uvd = usb_get_intfdata (intf);
849 err("%s($%p): Illegal call.", __FUNCTION__, intf);
853 usb_set_intfdata (intf, NULL);
855 usbvideo_ClientIncModCount(uvd);
857 info("%s(%p.)", __FUNCTION__, intf);
859 mutex_lock(&uvd->lock);
860 uvd->remove_pending = 1; /* Now all ISO data will be ignored */
862 /* At this time we ask to cancel outstanding URBs */
863 GET_CALLBACK(uvd, stopDataPump)(uvd);
865 for (i=0; i < USBVIDEO_NUMSBUF; i++)
866 usb_free_urb(uvd->sbuf[i].urb);
868 usb_put_dev(uvd->dev);
869 uvd->dev = NULL; /* USB device is no more */
871 video_unregister_device(&uvd->vdev);
873 info("%s: Video unregistered.", __FUNCTION__);
876 info("%s: In use, disconnect pending.", __FUNCTION__);
878 usbvideo_CameraRelease(uvd);
879 mutex_unlock(&uvd->lock);
880 info("USB camera disconnected.");
882 usbvideo_ClientDecModCount(uvd);
886 * usbvideo_CameraRelease()
888 * This code does final release of uvd. This happens
889 * after the device is disconnected -and- all clients
890 * closed their files.
893 * 27-Jan-2000 Created.
895 static void usbvideo_CameraRelease(struct uvd *uvd)
898 err("%s: Illegal call", __FUNCTION__);
902 RingQueue_Free(&uvd->dp);
903 if (VALID_CALLBACK(uvd, userFree))
904 GET_CALLBACK(uvd, userFree)(uvd);
905 uvd->uvd_used = 0; /* This is atomic, no need to take mutex */
909 * usbvideo_find_struct()
911 * This code searches the array of preallocated (static) structures
912 * and returns index of the first one that isn't in use. Returns -1
913 * if there are no free structures.
916 * 27-Jan-2000 Created.
918 static int usbvideo_find_struct(struct usbvideo *cams)
923 err("No usbvideo handle?");
926 mutex_lock(&cams->lock);
927 for (u = 0; u < cams->num_cameras; u++) {
928 struct uvd *uvd = &cams->cam[u];
929 if (!uvd->uvd_used) /* This one is free */
931 uvd->uvd_used = 1; /* In use now */
932 mutex_init(&uvd->lock); /* to 1 == available */
938 mutex_unlock(&cams->lock);
942 static const struct file_operations usbvideo_fops = {
943 .owner = THIS_MODULE,
944 .open = usbvideo_v4l_open,
945 .release =usbvideo_v4l_close,
946 .read = usbvideo_v4l_read,
947 .mmap = usbvideo_v4l_mmap,
948 .ioctl = usbvideo_v4l_ioctl,
949 .compat_ioctl = v4l_compat_ioctl32,
952 static const struct video_device usbvideo_template = {
953 .owner = THIS_MODULE,
954 .type = VID_TYPE_CAPTURE,
955 .fops = &usbvideo_fops,
958 struct uvd *usbvideo_AllocateDevice(struct usbvideo *cams)
961 struct uvd *uvd = NULL;
964 err("No usbvideo handle?");
968 devnum = usbvideo_find_struct(cams);
970 err("IBM USB camera driver: Too many devices!");
973 uvd = &cams->cam[devnum];
974 dbg("Device entry #%d. at $%p", devnum, uvd);
976 /* Not relying upon caller we increase module counter ourselves */
977 usbvideo_ClientIncModCount(uvd);
979 mutex_lock(&uvd->lock);
980 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
981 uvd->sbuf[i].urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
982 if (uvd->sbuf[i].urb == NULL) {
983 err("usb_alloc_urb(%d.) failed.", FRAMES_PER_DESC);
990 uvd->remove_pending = 0;
992 RingQueue_Initialize(&uvd->dp);
994 /* Initialize video device structure */
995 uvd->vdev = usbvideo_template;
996 sprintf(uvd->vdev.name, "%.20s USB Camera", cams->drvName);
998 * The client is free to overwrite those because we
999 * return control to the client's probe function right now.
1002 mutex_unlock(&uvd->lock);
1003 usbvideo_ClientDecModCount(uvd);
1007 EXPORT_SYMBOL(usbvideo_AllocateDevice);
1009 int usbvideo_RegisterVideoDevice(struct uvd *uvd)
1011 char tmp1[20], tmp2[20]; /* Buffers for printing */
1014 err("%s: Illegal call.", __FUNCTION__);
1017 if (uvd->video_endp == 0) {
1018 info("%s: No video endpoint specified; data pump disabled.", __FUNCTION__);
1020 if (uvd->paletteBits == 0) {
1021 err("%s: No palettes specified!", __FUNCTION__);
1024 if (uvd->defaultPalette == 0) {
1025 info("%s: No default palette!", __FUNCTION__);
1028 uvd->max_frame_size = VIDEOSIZE_X(uvd->canvas) *
1029 VIDEOSIZE_Y(uvd->canvas) * V4L_BYTES_PER_PIXEL;
1030 usbvideo_VideosizeToString(tmp1, sizeof(tmp1), uvd->videosize);
1031 usbvideo_VideosizeToString(tmp2, sizeof(tmp2), uvd->canvas);
1033 if (uvd->debug > 0) {
1034 info("%s: iface=%d. endpoint=$%02x paletteBits=$%08lx",
1035 __FUNCTION__, uvd->iface, uvd->video_endp, uvd->paletteBits);
1037 if (video_register_device(&uvd->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
1038 err("%s: video_register_device failed", __FUNCTION__);
1041 if (uvd->debug > 1) {
1042 info("%s: video_register_device() successful", __FUNCTION__);
1044 if (uvd->dev == NULL) {
1045 err("%s: uvd->dev == NULL", __FUNCTION__);
1049 info("%s on /dev/video%d: canvas=%s videosize=%s",
1050 (uvd->handle != NULL) ? uvd->handle->drvName : "???",
1051 uvd->vdev.minor, tmp2, tmp1);
1053 usb_get_dev(uvd->dev);
1057 EXPORT_SYMBOL(usbvideo_RegisterVideoDevice);
1059 /* ******************************************************************** */
1061 static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma)
1063 struct uvd *uvd = file->private_data;
1064 unsigned long start = vma->vm_start;
1065 unsigned long size = vma->vm_end-vma->vm_start;
1066 unsigned long page, pos;
1068 if (!CAMERA_IS_OPERATIONAL(uvd))
1071 if (size > (((USBVIDEO_NUMFRAMES * uvd->max_frame_size) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)))
1074 pos = (unsigned long) uvd->fbuf;
1076 page = vmalloc_to_pfn((void *)pos);
1077 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
1082 if (size > PAGE_SIZE)
1092 * usbvideo_v4l_open()
1094 * This is part of Video 4 Linux API. The driver can be opened by one
1095 * client only (checks internal counter 'uvdser'). The procedure
1096 * then allocates buffers needed for video processing.
1099 * 22-Jan-2000 Rewrote, moved scratch buffer allocation here. Now the
1100 * camera is also initialized here (once per connect), at
1101 * expense of V4L client (it waits on open() call).
1102 * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
1103 * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
1105 static int usbvideo_v4l_open(struct inode *inode, struct file *file)
1107 struct video_device *dev = video_devdata(file);
1108 struct uvd *uvd = (struct uvd *) dev;
1109 const int sb_size = FRAMES_PER_DESC * uvd->iso_packet_len;
1113 info("%s($%p)", __FUNCTION__, dev);
1115 if (0 < usbvideo_ClientIncModCount(uvd))
1117 mutex_lock(&uvd->lock);
1120 err("%s: Someone tried to open an already opened device!", __FUNCTION__);
1123 /* Clear statistics */
1124 memset(&uvd->stats, 0, sizeof(uvd->stats));
1126 /* Clean pointers so we know if we allocated something */
1127 for (i=0; i < USBVIDEO_NUMSBUF; i++)
1128 uvd->sbuf[i].data = NULL;
1130 /* Allocate memory for the frame buffers */
1131 uvd->fbuf_size = USBVIDEO_NUMFRAMES * uvd->max_frame_size;
1132 uvd->fbuf = usbvideo_rvmalloc(uvd->fbuf_size);
1133 RingQueue_Allocate(&uvd->dp, RING_QUEUE_SIZE);
1134 if ((uvd->fbuf == NULL) ||
1135 (!RingQueue_IsAllocated(&uvd->dp))) {
1136 err("%s: Failed to allocate fbuf or dp", __FUNCTION__);
1139 /* Allocate all buffers */
1140 for (i=0; i < USBVIDEO_NUMFRAMES; i++) {
1141 uvd->frame[i].frameState = FrameState_Unused;
1142 uvd->frame[i].data = uvd->fbuf + i*(uvd->max_frame_size);
1144 * Set default sizes in case IOCTL (VIDIOCMCAPTURE)
1145 * is not used (using read() instead).
1147 uvd->frame[i].canvas = uvd->canvas;
1148 uvd->frame[i].seqRead_Index = 0;
1150 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1151 uvd->sbuf[i].data = kmalloc(sb_size, GFP_KERNEL);
1152 if (uvd->sbuf[i].data == NULL) {
1159 /* Have to free all that memory */
1160 if (uvd->fbuf != NULL) {
1161 usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
1164 RingQueue_Free(&uvd->dp);
1165 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1166 kfree(uvd->sbuf[i].data);
1167 uvd->sbuf[i].data = NULL;
1172 /* If so far no errors then we shall start the camera */
1174 /* Start data pump if we have valid endpoint */
1175 if (uvd->video_endp != 0)
1176 errCode = GET_CALLBACK(uvd, startDataPump)(uvd);
1178 if (VALID_CALLBACK(uvd, setupOnOpen)) {
1180 info("%s: setupOnOpen callback", __FUNCTION__);
1181 errCode = GET_CALLBACK(uvd, setupOnOpen)(uvd);
1183 err("%s: setupOnOpen callback failed (%d.).",
1184 __FUNCTION__, errCode);
1185 } else if (uvd->debug > 1) {
1186 info("%s: setupOnOpen callback successful", __FUNCTION__);
1190 uvd->settingsAdjusted = 0;
1192 info("%s: Open succeeded.", __FUNCTION__);
1194 file->private_data = uvd;
1198 mutex_unlock(&uvd->lock);
1200 usbvideo_ClientDecModCount(uvd);
1202 info("%s: Returning %d.", __FUNCTION__, errCode);
1207 * usbvideo_v4l_close()
1209 * This is part of Video 4 Linux API. The procedure
1210 * stops streaming and deallocates all buffers that were earlier
1211 * allocated in usbvideo_v4l_open().
1214 * 22-Jan-2000 Moved scratch buffer deallocation here.
1215 * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
1216 * 24-May-2000 Moved MOD_DEC_USE_COUNT outside of code that can sleep.
1218 static int usbvideo_v4l_close(struct inode *inode, struct file *file)
1220 struct video_device *dev = file->private_data;
1221 struct uvd *uvd = (struct uvd *) dev;
1225 info("%s($%p)", __FUNCTION__, dev);
1227 mutex_lock(&uvd->lock);
1228 GET_CALLBACK(uvd, stopDataPump)(uvd);
1229 usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
1231 RingQueue_Free(&uvd->dp);
1233 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1234 kfree(uvd->sbuf[i].data);
1235 uvd->sbuf[i].data = NULL;
1238 #if USBVIDEO_REPORT_STATS
1239 usbvideo_ReportStatistics(uvd);
1243 if (uvd->remove_pending) {
1245 info("usbvideo_v4l_close: Final disconnect.");
1246 usbvideo_CameraRelease(uvd);
1248 mutex_unlock(&uvd->lock);
1249 usbvideo_ClientDecModCount(uvd);
1252 info("%s: Completed.", __FUNCTION__);
1253 file->private_data = NULL;
1258 * usbvideo_v4l_ioctl()
1260 * This is part of Video 4 Linux API. The procedure handles ioctl() calls.
1263 * 22-Jan-2000 Corrected VIDIOCSPICT to reject unsupported settings.
1265 static int usbvideo_v4l_do_ioctl(struct inode *inode, struct file *file,
1266 unsigned int cmd, void *arg)
1268 struct uvd *uvd = file->private_data;
1270 if (!CAMERA_IS_OPERATIONAL(uvd))
1276 struct video_capability *b = arg;
1282 struct video_channel *v = arg;
1288 struct video_channel *v = arg;
1289 if (v->channel != 0)
1295 struct video_picture *pic = arg;
1301 struct video_picture *pic = arg;
1303 * Use temporary 'video_picture' structure to preserve our
1304 * own settings (such as color depth, palette) that we
1305 * aren't allowing everyone (V4L client) to change.
1307 uvd->vpic.brightness = pic->brightness;
1308 uvd->vpic.hue = pic->hue;
1309 uvd->vpic.colour = pic->colour;
1310 uvd->vpic.contrast = pic->contrast;
1311 uvd->settingsAdjusted = 0; /* Will force new settings */
1316 struct video_window *vw = arg;
1318 if(VALID_CALLBACK(uvd, setVideoMode)) {
1319 return GET_CALLBACK(uvd, setVideoMode)(uvd, vw);
1326 if (vw->width != VIDEOSIZE_X(uvd->canvas))
1328 if (vw->height != VIDEOSIZE_Y(uvd->canvas))
1335 struct video_window *vw = arg;
1339 vw->width = VIDEOSIZE_X(uvd->videosize);
1340 vw->height = VIDEOSIZE_Y(uvd->videosize);
1342 if (VALID_CALLBACK(uvd, getFPS))
1343 vw->flags = GET_CALLBACK(uvd, getFPS)(uvd);
1345 vw->flags = 10; /* FIXME: do better! */
1350 struct video_mbuf *vm = arg;
1353 memset(vm, 0, sizeof(*vm));
1354 vm->size = uvd->max_frame_size * USBVIDEO_NUMFRAMES;
1355 vm->frames = USBVIDEO_NUMFRAMES;
1356 for(i = 0; i < USBVIDEO_NUMFRAMES; i++)
1357 vm->offsets[i] = i * uvd->max_frame_size;
1361 case VIDIOCMCAPTURE:
1363 struct video_mmap *vm = arg;
1365 if (uvd->debug >= 1) {
1366 info("VIDIOCMCAPTURE: frame=%d. size=%dx%d, format=%d.",
1367 vm->frame, vm->width, vm->height, vm->format);
1370 * Check if the requested size is supported. If the requestor
1371 * requests too big a frame then we may be tricked into accessing
1372 * outside of own preallocated frame buffer (in uvd->frame).
1373 * This will cause oops or a security hole. Theoretically, we
1374 * could only clamp the size down to acceptable bounds, but then
1375 * we'd need to figure out how to insert our smaller buffer into
1376 * larger caller's buffer... this is not an easy question. So we
1377 * here just flatly reject too large requests, assuming that the
1378 * caller will resubmit with smaller size. Callers should know
1379 * what size we support (returned by VIDIOCGCAP). However vidcat,
1380 * for one, does not care and allows to ask for any size.
1382 if ((vm->width > VIDEOSIZE_X(uvd->canvas)) ||
1383 (vm->height > VIDEOSIZE_Y(uvd->canvas))) {
1384 if (uvd->debug > 0) {
1385 info("VIDIOCMCAPTURE: Size=%dx%d too large; "
1386 "allowed only up to %ldx%ld", vm->width, vm->height,
1387 VIDEOSIZE_X(uvd->canvas), VIDEOSIZE_Y(uvd->canvas));
1391 /* Check if the palette is supported */
1392 if (((1L << vm->format) & uvd->paletteBits) == 0) {
1393 if (uvd->debug > 0) {
1394 info("VIDIOCMCAPTURE: format=%d. not supported"
1395 " (paletteBits=$%08lx)",
1396 vm->format, uvd->paletteBits);
1400 if ((vm->frame < 0) || (vm->frame >= USBVIDEO_NUMFRAMES)) {
1401 err("VIDIOCMCAPTURE: vm.frame=%d. !E [0-%d]", vm->frame, USBVIDEO_NUMFRAMES-1);
1404 if (uvd->frame[vm->frame].frameState == FrameState_Grabbing) {
1405 /* Not an error - can happen */
1407 uvd->frame[vm->frame].request = VIDEOSIZE(vm->width, vm->height);
1408 uvd->frame[vm->frame].palette = vm->format;
1410 /* Mark it as ready */
1411 uvd->frame[vm->frame].frameState = FrameState_Ready;
1413 return usbvideo_NewFrame(uvd, vm->frame);
1417 int *frameNum = arg;
1420 if (*frameNum < 0 || *frameNum >= USBVIDEO_NUMFRAMES)
1423 if (uvd->debug >= 1)
1424 info("VIDIOCSYNC: syncing to frame %d.", *frameNum);
1425 if (uvd->flags & FLAGS_NO_DECODING)
1426 ret = usbvideo_GetFrame(uvd, *frameNum);
1427 else if (VALID_CALLBACK(uvd, getFrame)) {
1428 ret = GET_CALLBACK(uvd, getFrame)(uvd, *frameNum);
1429 if ((ret < 0) && (uvd->debug >= 1)) {
1430 err("VIDIOCSYNC: getFrame() returned %d.", ret);
1433 err("VIDIOCSYNC: getFrame is not set");
1438 * The frame is in FrameState_Done_Hold state. Release it
1439 * right now because its data is already mapped into
1440 * the user space and it's up to the application to
1441 * make use of it until it asks for another frame.
1443 uvd->frame[*frameNum].frameState = FrameState_Unused;
1448 struct video_buffer *vb = arg;
1450 memset(vb, 0, sizeof(*vb));
1472 return -ENOIOCTLCMD;
1477 static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
1478 unsigned int cmd, unsigned long arg)
1480 return video_usercopy(inode, file, cmd, arg, usbvideo_v4l_do_ioctl);
1484 * usbvideo_v4l_read()
1486 * This is mostly boring stuff. We simply ask for a frame and when it
1487 * arrives copy all the video data from it into user space. There is
1488 * no obvious need to override this method.
1491 * 20-Oct-2000 Created.
1492 * 01-Nov-2000 Added mutex (uvd->lock).
1494 static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
1495 size_t count, loff_t *ppos)
1497 struct uvd *uvd = file->private_data;
1498 int noblock = file->f_flags & O_NONBLOCK;
1500 struct usbvideo_frame *frame;
1502 if (!CAMERA_IS_OPERATIONAL(uvd) || (buf == NULL))
1505 if (uvd->debug >= 1)
1506 info("%s: %Zd. bytes, noblock=%d.", __FUNCTION__, count, noblock);
1508 mutex_lock(&uvd->lock);
1510 /* See if a frame is completed, then use it. */
1511 for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
1512 if ((uvd->frame[i].frameState == FrameState_Done) ||
1513 (uvd->frame[i].frameState == FrameState_Done_Hold) ||
1514 (uvd->frame[i].frameState == FrameState_Error)) {
1520 /* FIXME: If we don't start a frame here then who ever does? */
1521 if (noblock && (frmx == -1)) {
1527 * If no FrameState_Done, look for a FrameState_Grabbing state.
1528 * See if a frame is in process (grabbing), then use it.
1529 * We will need to wait until it becomes cooked, of course.
1532 for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
1533 if (uvd->frame[i].frameState == FrameState_Grabbing) {
1541 * If no frame is active, start one. We don't care which one
1542 * it will be, so #0 is as good as any.
1543 * In read access mode we don't have convenience of VIDIOCMCAPTURE
1544 * to specify the requested palette (video format) on per-frame
1545 * basis. This means that we have to return data in -some- format
1546 * and just hope that the client knows what to do with it.
1547 * The default format is configured in uvd->defaultPalette field
1548 * as one of VIDEO_PALETTE_xxx values. We stuff it into the new
1549 * frame and initiate the frame filling process.
1552 if (uvd->defaultPalette == 0) {
1553 err("%s: No default palette; don't know what to do!", __FUNCTION__);
1559 * We have no per-frame control over video size.
1560 * Therefore we only can use whatever size was
1561 * specified as default.
1563 uvd->frame[frmx].request = uvd->videosize;
1564 uvd->frame[frmx].palette = uvd->defaultPalette;
1565 uvd->frame[frmx].frameState = FrameState_Ready;
1566 usbvideo_NewFrame(uvd, frmx);
1567 /* Now frame 0 is supposed to start filling... */
1571 * Get a pointer to the active frame. It is either previously
1572 * completed frame or frame in progress but not completed yet.
1574 frame = &uvd->frame[frmx];
1577 * Sit back & wait until the frame gets filled and postprocessed.
1578 * If we fail to get the picture [in time] then return the error.
1579 * In this call we specify that we want the frame to be waited for,
1580 * postprocessed and switched into FrameState_Done_Hold state. This
1581 * state is used to hold the frame as "fully completed" between
1582 * subsequent partial reads of the same frame.
1584 if (frame->frameState != FrameState_Done_Hold) {
1586 if (uvd->flags & FLAGS_NO_DECODING)
1587 rv = usbvideo_GetFrame(uvd, frmx);
1588 else if (VALID_CALLBACK(uvd, getFrame))
1589 rv = GET_CALLBACK(uvd, getFrame)(uvd, frmx);
1591 err("getFrame is not set");
1592 if ((rv != 0) || (frame->frameState != FrameState_Done_Hold)) {
1599 * Copy bytes to user space. We allow for partial reads, which
1600 * means that the user application can request read less than
1601 * the full frame size. It is up to the application to issue
1602 * subsequent calls until entire frame is read.
1604 * First things first, make sure we don't copy more than we
1605 * have - even if the application wants more. That would be
1606 * a big security embarassment!
1608 if ((count + frame->seqRead_Index) > frame->seqRead_Length)
1609 count = frame->seqRead_Length - frame->seqRead_Index;
1612 * Copy requested amount of data to user space. We start
1613 * copying from the position where we last left it, which
1614 * will be zero for a new frame (not read before).
1616 if (copy_to_user(buf, frame->data + frame->seqRead_Index, count)) {
1621 /* Update last read position */
1622 frame->seqRead_Index += count;
1623 if (uvd->debug >= 1) {
1624 err("%s: {copy} count used=%Zd, new seqRead_Index=%ld",
1625 __FUNCTION__, count, frame->seqRead_Index);
1628 /* Finally check if the frame is done with and "release" it */
1629 if (frame->seqRead_Index >= frame->seqRead_Length) {
1630 /* All data has been read */
1631 frame->seqRead_Index = 0;
1633 /* Mark it as available to be used again. */
1634 uvd->frame[frmx].frameState = FrameState_Unused;
1635 if (usbvideo_NewFrame(uvd, (frmx + 1) % USBVIDEO_NUMFRAMES)) {
1636 err("%s: usbvideo_NewFrame failed.", __FUNCTION__);
1640 mutex_unlock(&uvd->lock);
1645 * Make all of the blocks of data contiguous
1647 static int usbvideo_CompressIsochronous(struct uvd *uvd, struct urb *urb)
1652 for (i = 0; i < urb->number_of_packets; i++) {
1653 int n = urb->iso_frame_desc[i].actual_length;
1654 int st = urb->iso_frame_desc[i].status;
1656 cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1658 /* Detect and ignore errored packets */
1660 if (uvd->debug >= 1)
1661 err("Data error: packet=%d. len=%d. status=%d.", i, n, st);
1662 uvd->stats.iso_err_count++;
1666 /* Detect and ignore empty packets */
1668 uvd->stats.iso_skip_count++;
1671 totlen += n; /* Little local accounting */
1672 RingQueue_Enqueue(&uvd->dp, cdata, n);
1677 static void usbvideo_IsocIrq(struct urb *urb)
1680 struct uvd *uvd = urb->context;
1682 /* We don't want to do anything if we are about to be removed! */
1683 if (!CAMERA_IS_OPERATIONAL(uvd))
1686 if (urb->actual_length > 0) {
1687 info("urb=$%p status=%d. errcount=%d. length=%d.",
1688 urb, urb->status, urb->error_count, urb->actual_length);
1692 info("No Isoc data");
1696 if (!uvd->streaming) {
1697 if (uvd->debug >= 1)
1698 info("Not streaming, but interrupt!");
1702 uvd->stats.urb_count++;
1703 if (urb->actual_length <= 0)
1706 /* Copy the data received into ring queue */
1707 len = usbvideo_CompressIsochronous(uvd, urb);
1708 uvd->stats.urb_length = len;
1712 /* Here we got some data */
1713 uvd->stats.data_count += len;
1714 RingQueue_WakeUpInterruptible(&uvd->dp);
1717 for (i = 0; i < FRAMES_PER_DESC; i++) {
1718 urb->iso_frame_desc[i].status = 0;
1719 urb->iso_frame_desc[i].actual_length = 0;
1722 urb->dev = uvd->dev;
1723 ret = usb_submit_urb (urb, GFP_KERNEL);
1725 err("usb_submit_urb error (%d)", ret);
1730 * usbvideo_StartDataPump()
1733 * 27-Jan-2000 Used ibmcam->iface, ibmcam->ifaceAltActive instead
1734 * of hardcoded values. Simplified by using for loop,
1735 * allowed any number of URBs.
1737 static int usbvideo_StartDataPump(struct uvd *uvd)
1739 struct usb_device *dev = uvd->dev;
1743 info("%s($%p)", __FUNCTION__, uvd);
1745 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1746 err("%s: Camera is not operational", __FUNCTION__);
1751 /* Alternate interface 1 is is the biggest frame size */
1752 i = usb_set_interface(dev, uvd->iface, uvd->ifaceAltActive);
1754 err("%s: usb_set_interface error", __FUNCTION__);
1755 uvd->last_error = i;
1758 if (VALID_CALLBACK(uvd, videoStart))
1759 GET_CALLBACK(uvd, videoStart)(uvd);
1761 err("%s: videoStart not set", __FUNCTION__);
1763 /* We double buffer the Iso lists */
1764 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1766 struct urb *urb = uvd->sbuf[i].urb;
1769 urb->pipe = usb_rcvisocpipe(dev, uvd->video_endp);
1771 urb->transfer_flags = URB_ISO_ASAP;
1772 urb->transfer_buffer = uvd->sbuf[i].data;
1773 urb->complete = usbvideo_IsocIrq;
1774 urb->number_of_packets = FRAMES_PER_DESC;
1775 urb->transfer_buffer_length = uvd->iso_packet_len * FRAMES_PER_DESC;
1776 for (j=k=0; j < FRAMES_PER_DESC; j++, k += uvd->iso_packet_len) {
1777 urb->iso_frame_desc[j].offset = k;
1778 urb->iso_frame_desc[j].length = uvd->iso_packet_len;
1782 /* Submit all URBs */
1783 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1784 errFlag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
1786 err("%s: usb_submit_isoc(%d) ret %d", __FUNCTION__, i, errFlag);
1791 info("%s: streaming=1 video_endp=$%02x", __FUNCTION__, uvd->video_endp);
1796 * usbvideo_StopDataPump()
1798 * This procedure stops streaming and deallocates URBs. Then it
1799 * activates zero-bandwidth alt. setting of the video interface.
1802 * 22-Jan-2000 Corrected order of actions to work after surprise removal.
1803 * 27-Jan-2000 Used uvd->iface, uvd->ifaceAltInactive instead of hardcoded values.
1805 static void usbvideo_StopDataPump(struct uvd *uvd)
1809 if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
1813 info("%s($%p)", __FUNCTION__, uvd);
1815 /* Unschedule all of the iso td's */
1816 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1817 usb_kill_urb(uvd->sbuf[i].urb);
1820 info("%s: streaming=0", __FUNCTION__);
1823 if (!uvd->remove_pending) {
1824 /* Invoke minidriver's magic to stop the camera */
1825 if (VALID_CALLBACK(uvd, videoStop))
1826 GET_CALLBACK(uvd, videoStop)(uvd);
1828 err("%s: videoStop not set", __FUNCTION__);
1830 /* Set packet size to 0 */
1831 j = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltInactive);
1833 err("%s: usb_set_interface() error %d.", __FUNCTION__, j);
1834 uvd->last_error = j;
1840 * usbvideo_NewFrame()
1843 * 29-Mar-00 Added copying of previous frame into the current one.
1844 * 6-Aug-00 Added model 3 video sizes, removed redundant width, height.
1846 static int usbvideo_NewFrame(struct uvd *uvd, int framenum)
1848 struct usbvideo_frame *frame;
1852 info("usbvideo_NewFrame($%p,%d.)", uvd, framenum);
1854 /* If we're not grabbing a frame right now and the other frame is */
1855 /* ready to be grabbed into, then use it instead */
1856 if (uvd->curframe != -1)
1859 /* If necessary we adjust picture settings between frames */
1860 if (!uvd->settingsAdjusted) {
1861 if (VALID_CALLBACK(uvd, adjustPicture))
1862 GET_CALLBACK(uvd, adjustPicture)(uvd);
1863 uvd->settingsAdjusted = 1;
1866 n = (framenum + 1) % USBVIDEO_NUMFRAMES;
1867 if (uvd->frame[n].frameState == FrameState_Ready)
1870 frame = &uvd->frame[framenum];
1872 frame->frameState = FrameState_Grabbing;
1873 frame->scanstate = ScanState_Scanning;
1874 frame->seqRead_Length = 0; /* Accumulated in xxx_parse_data() */
1875 frame->deinterlace = Deinterlace_None;
1876 frame->flags = 0; /* No flags yet, up to minidriver (or us) to set them */
1877 uvd->curframe = framenum;
1880 * Normally we would want to copy previous frame into the current one
1881 * before we even start filling it with data; this allows us to stop
1882 * filling at any moment; top portion of the frame will be new and
1883 * bottom portion will stay as it was in previous frame. If we don't
1884 * do that then missing chunks of video stream will result in flickering
1885 * portions of old data whatever it was before.
1887 * If we choose not to copy previous frame (to, for example, save few
1888 * bus cycles - the frame can be pretty large!) then we have an option
1889 * to clear the frame before using. If we experience losses in this
1890 * mode then missing picture will be black (no flickering).
1892 * Finally, if user chooses not to clean the current frame before
1893 * filling it with data then the old data will be visible if we fail
1894 * to refill entire frame with new data.
1896 if (!(uvd->flags & FLAGS_SEPARATE_FRAMES)) {
1897 /* This copies previous frame into this one to mask losses */
1898 int prev = (framenum - 1 + USBVIDEO_NUMFRAMES) % USBVIDEO_NUMFRAMES;
1899 memmove(frame->data, uvd->frame[prev].data, uvd->max_frame_size);
1901 if (uvd->flags & FLAGS_CLEAN_FRAMES) {
1902 /* This provides a "clean" frame but slows things down */
1903 memset(frame->data, 0, uvd->max_frame_size);
1910 * usbvideo_CollectRawData()
1912 * This procedure can be used instead of 'processData' callback if you
1913 * only want to dump the raw data from the camera into the output
1914 * device (frame buffer). You can look at it with V4L client, but the
1915 * image will be unwatchable. The main purpose of this code and of the
1916 * mode FLAGS_NO_DECODING is debugging and capturing of datastreams from
1917 * new, unknown cameras. This procedure will be automatically invoked
1918 * instead of the specified callback handler when uvd->flags has bit
1919 * FLAGS_NO_DECODING set. Therefore, any regular build of any driver
1920 * based on usbvideo can use this feature at any time.
1922 static void usbvideo_CollectRawData(struct uvd *uvd, struct usbvideo_frame *frame)
1926 assert(uvd != NULL);
1927 assert(frame != NULL);
1929 /* Try to move data from queue into frame buffer */
1930 n = RingQueue_GetLength(&uvd->dp);
1933 /* See how much space we have left */
1934 m = uvd->max_frame_size - frame->seqRead_Length;
1937 /* Now move that much data into frame buffer */
1940 frame->data + frame->seqRead_Length,
1942 frame->seqRead_Length += m;
1944 /* See if we filled the frame */
1945 if (frame->seqRead_Length >= uvd->max_frame_size) {
1946 frame->frameState = FrameState_Done;
1948 uvd->stats.frame_num++;
1952 static int usbvideo_GetFrame(struct uvd *uvd, int frameNum)
1954 struct usbvideo_frame *frame = &uvd->frame[frameNum];
1956 if (uvd->debug >= 2)
1957 info("%s($%p,%d.)", __FUNCTION__, uvd, frameNum);
1959 switch (frame->frameState) {
1960 case FrameState_Unused:
1961 if (uvd->debug >= 2)
1962 info("%s: FrameState_Unused", __FUNCTION__);
1964 case FrameState_Ready:
1965 case FrameState_Grabbing:
1966 case FrameState_Error:
1968 int ntries, signalPending;
1970 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1971 if (uvd->debug >= 2)
1972 info("%s: Camera is not operational (1)", __FUNCTION__);
1977 RingQueue_InterruptibleSleepOn(&uvd->dp);
1978 signalPending = signal_pending(current);
1979 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1980 if (uvd->debug >= 2)
1981 info("%s: Camera is not operational (2)", __FUNCTION__);
1984 assert(uvd->fbuf != NULL);
1985 if (signalPending) {
1986 if (uvd->debug >= 2)
1987 info("%s: Signal=$%08x", __FUNCTION__, signalPending);
1988 if (uvd->flags & FLAGS_RETRY_VIDIOCSYNC) {
1989 usbvideo_TestPattern(uvd, 1, 0);
1991 uvd->stats.frame_num++;
1992 if (uvd->debug >= 2)
1993 info("%s: Forced test pattern screen", __FUNCTION__);
1996 /* Standard answer: Interrupted! */
1997 if (uvd->debug >= 2)
1998 info("%s: Interrupted!", __FUNCTION__);
2002 /* No signals - we just got new data in dp queue */
2003 if (uvd->flags & FLAGS_NO_DECODING)
2004 usbvideo_CollectRawData(uvd, frame);
2005 else if (VALID_CALLBACK(uvd, processData))
2006 GET_CALLBACK(uvd, processData)(uvd, frame);
2008 err("%s: processData not set", __FUNCTION__);
2010 } while (frame->frameState == FrameState_Grabbing);
2011 if (uvd->debug >= 2) {
2012 info("%s: Grabbing done; state=%d. (%lu. bytes)",
2013 __FUNCTION__, frame->frameState, frame->seqRead_Length);
2015 if (frame->frameState == FrameState_Error) {
2016 int ret = usbvideo_NewFrame(uvd, frameNum);
2018 err("%s: usbvideo_NewFrame() failed (%d.)", __FUNCTION__, ret);
2023 /* Note that we fall through to meet our destiny below */
2025 case FrameState_Done:
2027 * Do all necessary postprocessing of data prepared in
2028 * "interrupt" code and the collecting code above. The
2029 * frame gets marked as FrameState_Done by queue parsing code.
2030 * This status means that we collected enough data and
2031 * most likely processed it as we went through. However
2032 * the data may need postprocessing, such as deinterlacing
2033 * or picture adjustments implemented in software (horror!)
2035 * As soon as the frame becomes "final" it gets promoted to
2036 * FrameState_Done_Hold status where it will remain until the
2037 * caller consumed all the video data from the frame. Then
2038 * the empty shell of ex-frame is thrown out for dogs to eat.
2039 * But we, worried about pets, will recycle the frame!
2041 uvd->stats.frame_num++;
2042 if ((uvd->flags & FLAGS_NO_DECODING) == 0) {
2043 if (VALID_CALLBACK(uvd, postProcess))
2044 GET_CALLBACK(uvd, postProcess)(uvd, frame);
2045 if (frame->flags & USBVIDEO_FRAME_FLAG_SOFTWARE_CONTRAST)
2046 usbvideo_SoftwareContrastAdjustment(uvd, frame);
2048 frame->frameState = FrameState_Done_Hold;
2049 if (uvd->debug >= 2)
2050 info("%s: Entered FrameState_Done_Hold state.", __FUNCTION__);
2053 case FrameState_Done_Hold:
2055 * We stay in this state indefinitely until someone external,
2056 * like ioctl() or read() call finishes digesting the frame
2057 * data. Then it will mark the frame as FrameState_Unused and
2058 * it will be released back into the wild to roam freely.
2060 if (uvd->debug >= 2)
2061 info("%s: FrameState_Done_Hold state.", __FUNCTION__);
2065 /* Catch-all for other cases. We shall not be here. */
2066 err("%s: Invalid state %d.", __FUNCTION__, frame->frameState);
2067 frame->frameState = FrameState_Unused;
2072 * usbvideo_DeinterlaceFrame()
2074 * This procedure deinterlaces the given frame. Some cameras produce
2075 * only half of scanlines - sometimes only even lines, sometimes only
2076 * odd lines. The deinterlacing method is stored in frame->deinterlace
2079 * Here we scan the frame vertically and replace missing scanlines with
2080 * average between surrounding ones - before and after. If we have no
2081 * line above then we just copy next line. Similarly, if we need to
2082 * create a last line then preceding line is used.
2084 void usbvideo_DeinterlaceFrame(struct uvd *uvd, struct usbvideo_frame *frame)
2086 if ((uvd == NULL) || (frame == NULL))
2089 if ((frame->deinterlace == Deinterlace_FillEvenLines) ||
2090 (frame->deinterlace == Deinterlace_FillOddLines))
2092 const int v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
2093 int i = (frame->deinterlace == Deinterlace_FillEvenLines) ? 0 : 1;
2095 for (; i < VIDEOSIZE_Y(frame->request); i += 2) {
2096 const unsigned char *fs1, *fs2;
2098 int ip, in, j; /* Previous and next lines */
2101 * Need to average lines before and after 'i'.
2102 * If we go out of bounds seeking those lines then
2103 * we point back to existing line.
2105 ip = i - 1; /* First, get rough numbers */
2111 if (in >= VIDEOSIZE_Y(frame->request))
2115 if ((ip < 0) || (in < 0) ||
2116 (ip >= VIDEOSIZE_Y(frame->request)) ||
2117 (in >= VIDEOSIZE_Y(frame->request)))
2119 err("Error: ip=%d. in=%d. req.height=%ld.",
2120 ip, in, VIDEOSIZE_Y(frame->request));
2124 /* Now we need to average lines 'ip' and 'in' to produce line 'i' */
2125 fs1 = frame->data + (v4l_linesize * ip);
2126 fs2 = frame->data + (v4l_linesize * in);
2127 fd = frame->data + (v4l_linesize * i);
2129 /* Average lines around destination */
2130 for (j=0; j < v4l_linesize; j++) {
2131 fd[j] = (unsigned char)((((unsigned) fs1[j]) +
2132 ((unsigned)fs2[j])) >> 1);
2137 /* Optionally display statistics on the screen */
2138 if (uvd->flags & FLAGS_OVERLAY_STATS)
2139 usbvideo_OverlayStats(uvd, frame);
2142 EXPORT_SYMBOL(usbvideo_DeinterlaceFrame);
2145 * usbvideo_SoftwareContrastAdjustment()
2147 * This code adjusts the contrast of the frame, assuming RGB24 format.
2148 * As most software image processing, this job is CPU-intensive.
2149 * Get a camera that supports hardware adjustment!
2152 * 09-Feb-2001 Created.
2154 static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
2155 struct usbvideo_frame *frame)
2157 int i, j, v4l_linesize;
2159 const int ccm = 128; /* Color correction median - see below */
2161 if ((uvd == NULL) || (frame == NULL)) {
2162 err("%s: Illegal call.", __FUNCTION__);
2165 adj = (uvd->vpic.contrast - 0x8000) >> 8; /* -128..+127 = -ccm..+(ccm-1)*/
2166 RESTRICT_TO_RANGE(adj, -ccm, ccm+1);
2168 /* In rare case of no adjustment */
2171 v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
2172 for (i=0; i < VIDEOSIZE_Y(frame->request); i++) {
2173 unsigned char *fd = frame->data + (v4l_linesize * i);
2174 for (j=0; j < v4l_linesize; j++) {
2175 signed long v = (signed long) fd[j];
2176 /* Magnify up to 2 times, reduce down to zero */
2177 v = 128 + ((ccm + adj) * (v - 128)) / ccm;
2178 RESTRICT_TO_RANGE(v, 0, 0xFF); /* Must flatten tails */
2179 fd[j] = (unsigned char) v;
2184 MODULE_LICENSE("GPL");