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/smp_lock.h>
24 #include <linux/vmalloc.h>
25 #include <linux/init.h>
26 #include <linux/spinlock.h>
33 #define virt_to_page(v) MAP_NR(v) /* Kernels 2.2.x */
36 static int video_nr = -1;
37 module_param(video_nr, int, 0);
42 static void usbvideo_Disconnect(struct usb_interface *intf);
43 static void usbvideo_CameraRelease(struct uvd *uvd);
45 static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
46 unsigned int cmd, unsigned long arg);
47 static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma);
48 static int usbvideo_v4l_open(struct inode *inode, struct file *file);
49 static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
50 size_t count, loff_t *ppos);
51 static int usbvideo_v4l_close(struct inode *inode, struct file *file);
53 static int usbvideo_StartDataPump(struct uvd *uvd);
54 static void usbvideo_StopDataPump(struct uvd *uvd);
55 static int usbvideo_GetFrame(struct uvd *uvd, int frameNum);
56 static int usbvideo_NewFrame(struct uvd *uvd, int framenum);
57 static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
58 struct usbvideo_frame *frame);
60 /*******************************/
61 /* Memory management functions */
62 /*******************************/
63 static void *usbvideo_rvmalloc(unsigned long size)
68 size = PAGE_ALIGN(size);
69 mem = vmalloc_32(size);
73 memset(mem, 0, size); /* Clear the ram out, no junk to the user */
74 adr = (unsigned long) mem;
76 SetPageReserved(vmalloc_to_page((void *)adr));
84 static void usbvideo_rvfree(void *mem, unsigned long size)
91 adr = (unsigned long) mem;
92 while ((long) size > 0) {
93 ClearPageReserved(vmalloc_to_page((void *)adr));
100 static void RingQueue_Initialize(struct RingQueue *rq)
103 init_waitqueue_head(&rq->wqh);
106 static void RingQueue_Allocate(struct RingQueue *rq, int rqLen)
108 /* Make sure the requested size is a power of 2 and
109 round up if necessary. This allows index wrapping
110 using masks rather than modulo */
118 if(rqLen != 1 << (i-1))
123 rq->queue = usbvideo_rvmalloc(rq->length);
124 assert(rq->queue != NULL);
127 static int RingQueue_IsAllocated(const struct RingQueue *rq)
131 return (rq->queue != NULL) && (rq->length > 0);
134 static void RingQueue_Free(struct RingQueue *rq)
137 if (RingQueue_IsAllocated(rq)) {
138 usbvideo_rvfree(rq->queue, rq->length);
144 int RingQueue_Dequeue(struct RingQueue *rq, unsigned char *dst, int len)
151 rql = RingQueue_GetLength(rq);
155 /* Clip requested length to available data */
160 if(rq->ri > rq->wi) {
161 /* Read data from tail */
162 int read = (toread < (rq->length - rq->ri)) ? toread : rq->length - rq->ri;
163 memcpy(dst, rq->queue + rq->ri, read);
166 rq->ri = (rq->ri + read) & (rq->length-1);
169 /* Read data from head */
170 memcpy(dst, rq->queue + rq->ri, toread);
171 rq->ri = (rq->ri + toread) & (rq->length-1);
176 EXPORT_SYMBOL(RingQueue_Dequeue);
178 int RingQueue_Enqueue(struct RingQueue *rq, const unsigned char *cdata, int n)
183 assert(cdata != NULL);
184 assert(rq->length > 0);
188 /* Calculate the largest chunk that fits the tail of the ring */
189 q_avail = rq->length - rq->wi;
192 q_avail = rq->length;
199 memcpy(rq->queue + rq->wi, cdata, m);
200 RING_QUEUE_ADVANCE_INDEX(rq, wi, m);
208 EXPORT_SYMBOL(RingQueue_Enqueue);
210 static void RingQueue_InterruptibleSleepOn(struct RingQueue *rq)
213 interruptible_sleep_on(&rq->wqh);
216 void RingQueue_WakeUpInterruptible(struct RingQueue *rq)
219 if (waitqueue_active(&rq->wqh))
220 wake_up_interruptible(&rq->wqh);
223 EXPORT_SYMBOL(RingQueue_WakeUpInterruptible);
225 void RingQueue_Flush(struct RingQueue *rq)
232 EXPORT_SYMBOL(RingQueue_Flush);
236 * usbvideo_VideosizeToString()
238 * This procedure converts given videosize value to readable string.
241 * 07-Aug-2000 Created.
242 * 19-Oct-2000 Reworked for usbvideo module.
244 static void usbvideo_VideosizeToString(char *buf, int bufLen, videosize_t vs)
249 n = 1 + sprintf(tmp, "%ldx%ld", VIDEOSIZE_X(vs), VIDEOSIZE_Y(vs));
250 assert(n < sizeof(tmp));
251 if ((buf == NULL) || (bufLen < n))
252 err("usbvideo_VideosizeToString: buffer is too small.");
254 memmove(buf, tmp, n);
258 * usbvideo_OverlayChar()
261 * 01-Feb-2000 Created.
263 static void usbvideo_OverlayChar(struct uvd *uvd, struct usbvideo_frame *frame,
264 int x, int y, int ch)
266 static const unsigned short digits[16] = {
284 unsigned short digit;
287 if ((uvd == NULL) || (frame == NULL))
290 if (ch >= '0' && ch <= '9')
292 else if (ch >= 'A' && ch <= 'F')
293 ch = 10 + (ch - 'A');
294 else if (ch >= 'a' && ch <= 'f')
295 ch = 10 + (ch - 'a');
300 for (iy=0; iy < 5; iy++) {
301 for (ix=0; ix < 3; ix++) {
302 if (digit & 0x8000) {
303 if (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24)) {
304 /* TODO */ RGB24_PUTPIXEL(frame, x+ix, y+iy, 0xFF, 0xFF, 0xFF);
313 * usbvideo_OverlayString()
316 * 01-Feb-2000 Created.
318 static void usbvideo_OverlayString(struct uvd *uvd, struct usbvideo_frame *frame,
319 int x, int y, const char *str)
322 usbvideo_OverlayChar(uvd, frame, x, y, *str);
324 x += 4; /* 3 pixels character + 1 space */
329 * usbvideo_OverlayStats()
331 * Overlays important debugging information.
334 * 01-Feb-2000 Created.
336 static void usbvideo_OverlayStats(struct uvd *uvd, struct usbvideo_frame *frame)
338 const int y_diff = 8;
341 long i, j, barLength;
342 const int qi_x1 = 60, qi_y1 = 10;
343 const int qi_x2 = VIDEOSIZE_X(frame->request) - 10, qi_h = 10;
345 /* Call the user callback, see if we may proceed after that */
346 if (VALID_CALLBACK(uvd, overlayHook)) {
347 if (GET_CALLBACK(uvd, overlayHook)(uvd, frame) < 0)
352 * We draw a (mostly) hollow rectangle with qi_xxx coordinates.
353 * Left edge symbolizes the queue index 0; right edge symbolizes
354 * the full capacity of the queue.
356 barLength = qi_x2 - qi_x1 - 2;
357 if ((barLength > 10) && (uvd->paletteBits & (1L << VIDEO_PALETTE_RGB24))) {
358 /* TODO */ long u_lo, u_hi, q_used;
359 long m_ri, m_wi, m_lo, m_hi;
362 * Determine fill zones (used areas of the queue):
363 * 0 xxxxxxx u_lo ...... uvd->dp.ri xxxxxxxx u_hi ..... uvd->dp.length
365 * if u_lo < 0 then there is no first filler.
368 q_used = RingQueue_GetLength(&uvd->dp);
369 if ((uvd->dp.ri + q_used) >= uvd->dp.length) {
370 u_hi = uvd->dp.length;
371 u_lo = (q_used + uvd->dp.ri) & (uvd->dp.length-1);
373 u_hi = (q_used + uvd->dp.ri);
377 /* Convert byte indices into screen units */
378 m_ri = qi_x1 + ((barLength * uvd->dp.ri) / uvd->dp.length);
379 m_wi = qi_x1 + ((barLength * uvd->dp.wi) / uvd->dp.length);
380 m_lo = (u_lo > 0) ? (qi_x1 + ((barLength * u_lo) / uvd->dp.length)) : -1;
381 m_hi = qi_x1 + ((barLength * u_hi) / uvd->dp.length);
383 for (j=qi_y1; j < (qi_y1 + qi_h); j++) {
384 for (i=qi_x1; i < qi_x2; i++) {
385 /* Draw border lines */
386 if ((j == qi_y1) || (j == (qi_y1 + qi_h - 1)) ||
387 (i == qi_x1) || (i == (qi_x2 - 1))) {
388 RGB24_PUTPIXEL(frame, i, j, 0xFF, 0xFF, 0xFF);
391 /* For all other points the Y coordinate does not matter */
392 if ((i >= m_ri) && (i <= (m_ri + 3))) {
393 RGB24_PUTPIXEL(frame, i, j, 0x00, 0xFF, 0x00);
394 } else if ((i >= m_wi) && (i <= (m_wi + 3))) {
395 RGB24_PUTPIXEL(frame, i, j, 0xFF, 0x00, 0x00);
396 } else if ((i < m_lo) || ((i > m_ri) && (i < m_hi)))
397 RGB24_PUTPIXEL(frame, i, j, 0x00, 0x00, 0xFF);
402 sprintf(tmp, "%8lx", uvd->stats.frame_num);
403 usbvideo_OverlayString(uvd, frame, x, y, tmp);
406 sprintf(tmp, "%8lx", uvd->stats.urb_count);
407 usbvideo_OverlayString(uvd, frame, x, y, tmp);
410 sprintf(tmp, "%8lx", uvd->stats.urb_length);
411 usbvideo_OverlayString(uvd, frame, x, y, tmp);
414 sprintf(tmp, "%8lx", uvd->stats.data_count);
415 usbvideo_OverlayString(uvd, frame, x, y, tmp);
418 sprintf(tmp, "%8lx", uvd->stats.header_count);
419 usbvideo_OverlayString(uvd, frame, x, y, tmp);
422 sprintf(tmp, "%8lx", uvd->stats.iso_skip_count);
423 usbvideo_OverlayString(uvd, frame, x, y, tmp);
426 sprintf(tmp, "%8lx", uvd->stats.iso_err_count);
427 usbvideo_OverlayString(uvd, frame, x, y, tmp);
430 sprintf(tmp, "%8x", uvd->vpic.colour);
431 usbvideo_OverlayString(uvd, frame, x, y, tmp);
434 sprintf(tmp, "%8x", uvd->vpic.hue);
435 usbvideo_OverlayString(uvd, frame, x, y, tmp);
438 sprintf(tmp, "%8x", uvd->vpic.brightness >> 8);
439 usbvideo_OverlayString(uvd, frame, x, y, tmp);
442 sprintf(tmp, "%8x", uvd->vpic.contrast >> 12);
443 usbvideo_OverlayString(uvd, frame, x, y, tmp);
446 sprintf(tmp, "%8d", uvd->vpic.whiteness >> 8);
447 usbvideo_OverlayString(uvd, frame, x, y, tmp);
452 * usbvideo_ReportStatistics()
454 * This procedure prints packet and transfer statistics.
457 * 14-Jan-2000 Corrected default multiplier.
459 static void usbvideo_ReportStatistics(const struct uvd *uvd)
461 if ((uvd != NULL) && (uvd->stats.urb_count > 0)) {
462 unsigned long allPackets, badPackets, goodPackets, percent;
463 allPackets = uvd->stats.urb_count * CAMERA_URB_FRAMES;
464 badPackets = uvd->stats.iso_skip_count + uvd->stats.iso_err_count;
465 goodPackets = allPackets - badPackets;
466 /* Calculate percentage wisely, remember integer limits */
467 assert(allPackets != 0);
468 if (goodPackets < (((unsigned long)-1)/100))
469 percent = (100 * goodPackets) / allPackets;
471 percent = goodPackets / (allPackets / 100);
472 info("Packet Statistics: Total=%lu. Empty=%lu. Usage=%lu%%",
473 allPackets, badPackets, percent);
474 if (uvd->iso_packet_len > 0) {
475 unsigned long allBytes, xferBytes;
476 char multiplier = ' ';
477 allBytes = allPackets * uvd->iso_packet_len;
478 xferBytes = uvd->stats.data_count;
479 assert(allBytes != 0);
480 if (xferBytes < (((unsigned long)-1)/100))
481 percent = (100 * xferBytes) / allBytes;
483 percent = xferBytes / (allBytes / 100);
484 /* Scale xferBytes for easy reading */
485 if (xferBytes > 10*1024) {
488 if (xferBytes > 10*1024) {
491 if (xferBytes > 10*1024) {
494 if (xferBytes > 10*1024) {
501 info("Transfer Statistics: Transferred=%lu%cB Usage=%lu%%",
502 xferBytes, multiplier, percent);
508 * usbvideo_TestPattern()
510 * Procedure forms a test pattern (yellow grid on blue background).
513 * fullframe: if TRUE then entire frame is filled, otherwise the procedure
514 * continues from the current scanline.
515 * pmode 0: fill the frame with solid blue color (like on VCR or TV)
516 * 1: Draw a colored grid
519 * 01-Feb-2000 Created.
521 void usbvideo_TestPattern(struct uvd *uvd, int fullframe, int pmode)
523 struct usbvideo_frame *frame;
526 static int num_pass = 0;
529 err("%s: uvd == NULL", __FUNCTION__);
532 if ((uvd->curframe < 0) || (uvd->curframe >= USBVIDEO_NUMFRAMES)) {
533 err("%s: uvd->curframe=%d.", __FUNCTION__, uvd->curframe);
537 /* Grab the current frame */
538 frame = &uvd->frame[uvd->curframe];
540 /* Optionally start at the beginning */
543 frame->seqRead_Length = 0;
546 { /* For debugging purposes only */
548 usbvideo_VideosizeToString(tmp, sizeof(tmp), frame->request);
549 info("testpattern: frame=%s", tmp);
552 /* Form every scan line */
553 for (; frame->curline < VIDEOSIZE_Y(frame->request); frame->curline++) {
555 unsigned char *f = frame->data +
556 (VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL * frame->curline);
557 for (i=0; i < VIDEOSIZE_X(frame->request); i++) {
558 unsigned char cb=0x80;
559 unsigned char cg = 0;
560 unsigned char cr = 0;
563 if (frame->curline % 32 == 0)
564 cb = 0, cg = cr = 0xFF;
565 else if (i % 32 == 0) {
566 if (frame->curline % 32 == 1)
568 cb = 0, cg = cr = 0xFF;
570 cb = ((num_cell*7) + num_pass) & 0xFF;
571 cg = ((num_cell*5) + num_pass*2) & 0xFF;
572 cr = ((num_cell*3) + num_pass*3) & 0xFF;
575 /* Just the blue screen */
585 frame->frameState = FrameState_Done;
586 frame->seqRead_Length += scan_length;
589 /* We do this unconditionally, regardless of FLAGS_OVERLAY_STATS */
590 usbvideo_OverlayStats(uvd, frame);
593 EXPORT_SYMBOL(usbvideo_TestPattern);
600 * A debugging tool. Prints hex dumps.
603 * 29-Jul-2000 Added printing of offsets.
605 void usbvideo_HexDump(const unsigned char *data, int len)
607 const int bytes_per_line = 32;
608 char tmp[128]; /* 32*3 + 5 */
611 for (i=k=0; len > 0; i++, len--) {
612 if (i > 0 && ((i % bytes_per_line) == 0)) {
616 if ((i % bytes_per_line) == 0)
617 k += sprintf(&tmp[k], "%04x: ", i);
618 k += sprintf(&tmp[k], "%02x ", data[i]);
624 EXPORT_SYMBOL(usbvideo_HexDump);
628 /* ******************************************************************** */
630 /* XXX: this piece of crap really wants some error handling.. */
631 static void usbvideo_ClientIncModCount(struct uvd *uvd)
634 err("%s: uvd == NULL", __FUNCTION__);
637 if (uvd->handle == NULL) {
638 err("%s: uvd->handle == NULL", __FUNCTION__);
641 if (uvd->handle->md_module == NULL) {
642 err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
645 if (!try_module_get(uvd->handle->md_module)) {
646 err("%s: try_module_get() == 0", __FUNCTION__);
651 static void usbvideo_ClientDecModCount(struct uvd *uvd)
654 err("%s: uvd == NULL", __FUNCTION__);
657 if (uvd->handle == NULL) {
658 err("%s: uvd->handle == NULL", __FUNCTION__);
661 if (uvd->handle->md_module == NULL) {
662 err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
665 module_put(uvd->handle->md_module);
668 int usbvideo_register(
669 struct usbvideo **pCams,
672 const char *driverName,
673 const struct usbvideo_cb *cbTbl,
675 const struct usb_device_id *id_table)
677 struct usbvideo *cams;
678 int i, base_size, result;
680 /* Check parameters for sanity */
681 if ((num_cams <= 0) || (pCams == NULL) || (cbTbl == NULL)) {
682 err("%s: Illegal call", __FUNCTION__);
686 /* Check registration callback - must be set! */
687 if (cbTbl->probe == NULL) {
688 err("%s: probe() is required!", __FUNCTION__);
692 base_size = num_cams * sizeof(struct uvd) + sizeof(struct usbvideo);
693 cams = (struct usbvideo *) kzalloc(base_size, GFP_KERNEL);
695 err("Failed to allocate %d. bytes for usbvideo struct", base_size);
698 dbg("%s: Allocated $%p (%d. bytes) for %d. cameras",
699 __FUNCTION__, cams, base_size, num_cams);
701 /* Copy callbacks, apply defaults for those that are not set */
702 memmove(&cams->cb, cbTbl, sizeof(cams->cb));
703 if (cams->cb.getFrame == NULL)
704 cams->cb.getFrame = usbvideo_GetFrame;
705 if (cams->cb.disconnect == NULL)
706 cams->cb.disconnect = usbvideo_Disconnect;
707 if (cams->cb.startDataPump == NULL)
708 cams->cb.startDataPump = usbvideo_StartDataPump;
709 if (cams->cb.stopDataPump == NULL)
710 cams->cb.stopDataPump = usbvideo_StopDataPump;
712 cams->num_cameras = num_cams;
713 cams->cam = (struct uvd *) &cams[1];
714 cams->md_module = md;
715 if (cams->md_module == NULL)
716 warn("%s: module == NULL!", __FUNCTION__);
717 mutex_init(&cams->lock); /* to 1 == available */
719 for (i = 0; i < num_cams; i++) {
720 struct uvd *up = &cams->cam[i];
724 /* Allocate user_data separately because of kmalloc's limits */
726 up->user_size = num_cams * num_extra;
727 up->user_data = kmalloc(up->user_size, GFP_KERNEL);
728 if (up->user_data == NULL) {
729 err("%s: Failed to allocate user_data (%d. bytes)",
730 __FUNCTION__, up->user_size);
732 up = &cams->cam[--i];
733 kfree(up->user_data);
738 dbg("%s: Allocated cams[%d].user_data=$%p (%d. bytes)",
739 __FUNCTION__, i, up->user_data, up->user_size);
744 * Register ourselves with USB stack.
746 strcpy(cams->drvName, (driverName != NULL) ? driverName : "Unknown");
747 cams->usbdrv.name = cams->drvName;
748 cams->usbdrv.probe = cams->cb.probe;
749 cams->usbdrv.disconnect = cams->cb.disconnect;
750 cams->usbdrv.id_table = id_table;
753 * Update global handle to usbvideo. This is very important
754 * because probe() can be called before usb_register() returns.
755 * If the handle is not yet updated then the probe() will fail.
758 result = usb_register(&cams->usbdrv);
760 for (i = 0; i < num_cams; i++) {
761 struct uvd *up = &cams->cam[i];
762 kfree(up->user_data);
770 EXPORT_SYMBOL(usbvideo_register);
773 * usbvideo_Deregister()
775 * Procedure frees all usbvideo and user data structures. Be warned that
776 * if you had some dynamically allocated components in ->user field then
777 * you should free them before calling here.
779 void usbvideo_Deregister(struct usbvideo **pCams)
781 struct usbvideo *cams;
785 err("%s: pCams == NULL", __FUNCTION__);
790 err("%s: cams == NULL", __FUNCTION__);
794 dbg("%s: Deregistering %s driver.", __FUNCTION__, cams->drvName);
795 usb_deregister(&cams->usbdrv);
797 dbg("%s: Deallocating cams=$%p (%d. cameras)", __FUNCTION__, cams, cams->num_cameras);
798 for (i=0; i < cams->num_cameras; i++) {
799 struct uvd *up = &cams->cam[i];
802 if (up->user_data != NULL) {
803 if (up->user_size <= 0)
806 if (up->user_size > 0)
810 err("%s: Warning: user_data=$%p user_size=%d.",
811 __FUNCTION__, up->user_data, up->user_size);
813 dbg("%s: Freeing %d. $%p->user_data=$%p",
814 __FUNCTION__, i, up, up->user_data);
815 kfree(up->user_data);
818 /* Whole array was allocated in one chunk */
819 dbg("%s: Freed %d uvd structures",
820 __FUNCTION__, cams->num_cameras);
825 EXPORT_SYMBOL(usbvideo_Deregister);
828 * usbvideo_Disconnect()
830 * This procedure stops all driver activity. Deallocation of
831 * the interface-private structure (pointed by 'ptr') is done now
832 * (if we don't have any open files) or later, when those files
833 * are closed. After that driver should be removable.
835 * This code handles surprise removal. The uvd->user is a counter which
836 * increments on open() and decrements on close(). If we see here that
837 * this counter is not 0 then we have a client who still has us opened.
838 * We set uvd->remove_pending flag as early as possible, and after that
839 * all access to the camera will gracefully fail. These failures should
840 * prompt client to (eventually) close the video device, and then - in
841 * usbvideo_v4l_close() - we decrement uvd->uvd_used and usage counter.
844 * 22-Jan-2000 Added polling of MOD_IN_USE to delay removal until all users gone.
845 * 27-Jan-2000 Reworked to allow pending disconnects; see xxx_close()
846 * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
847 * 19-Oct-2000 Moved to usbvideo module.
849 static void usbvideo_Disconnect(struct usb_interface *intf)
851 struct uvd *uvd = usb_get_intfdata (intf);
855 err("%s($%p): Illegal call.", __FUNCTION__, intf);
859 usb_set_intfdata (intf, NULL);
861 usbvideo_ClientIncModCount(uvd);
863 info("%s(%p.)", __FUNCTION__, intf);
865 mutex_lock(&uvd->lock);
866 uvd->remove_pending = 1; /* Now all ISO data will be ignored */
868 /* At this time we ask to cancel outstanding URBs */
869 GET_CALLBACK(uvd, stopDataPump)(uvd);
871 for (i=0; i < USBVIDEO_NUMSBUF; i++)
872 usb_free_urb(uvd->sbuf[i].urb);
874 usb_put_dev(uvd->dev);
875 uvd->dev = NULL; /* USB device is no more */
877 video_unregister_device(&uvd->vdev);
879 info("%s: Video unregistered.", __FUNCTION__);
882 info("%s: In use, disconnect pending.", __FUNCTION__);
884 usbvideo_CameraRelease(uvd);
885 mutex_unlock(&uvd->lock);
886 info("USB camera disconnected.");
888 usbvideo_ClientDecModCount(uvd);
892 * usbvideo_CameraRelease()
894 * This code does final release of uvd. This happens
895 * after the device is disconnected -and- all clients
896 * closed their files.
899 * 27-Jan-2000 Created.
901 static void usbvideo_CameraRelease(struct uvd *uvd)
904 err("%s: Illegal call", __FUNCTION__);
908 RingQueue_Free(&uvd->dp);
909 if (VALID_CALLBACK(uvd, userFree))
910 GET_CALLBACK(uvd, userFree)(uvd);
911 uvd->uvd_used = 0; /* This is atomic, no need to take mutex */
915 * usbvideo_find_struct()
917 * This code searches the array of preallocated (static) structures
918 * and returns index of the first one that isn't in use. Returns -1
919 * if there are no free structures.
922 * 27-Jan-2000 Created.
924 static int usbvideo_find_struct(struct usbvideo *cams)
929 err("No usbvideo handle?");
932 mutex_lock(&cams->lock);
933 for (u = 0; u < cams->num_cameras; u++) {
934 struct uvd *uvd = &cams->cam[u];
935 if (!uvd->uvd_used) /* This one is free */
937 uvd->uvd_used = 1; /* In use now */
938 mutex_init(&uvd->lock); /* to 1 == available */
944 mutex_unlock(&cams->lock);
948 static struct file_operations usbvideo_fops = {
949 .owner = THIS_MODULE,
950 .open = usbvideo_v4l_open,
951 .release =usbvideo_v4l_close,
952 .read = usbvideo_v4l_read,
953 .mmap = usbvideo_v4l_mmap,
954 .ioctl = usbvideo_v4l_ioctl,
955 .compat_ioctl = v4l_compat_ioctl32,
958 static const struct video_device usbvideo_template = {
959 .owner = THIS_MODULE,
960 .type = VID_TYPE_CAPTURE,
961 .hardware = VID_HARDWARE_CPIA,
962 .fops = &usbvideo_fops,
965 struct uvd *usbvideo_AllocateDevice(struct usbvideo *cams)
968 struct uvd *uvd = NULL;
971 err("No usbvideo handle?");
975 devnum = usbvideo_find_struct(cams);
977 err("IBM USB camera driver: Too many devices!");
980 uvd = &cams->cam[devnum];
981 dbg("Device entry #%d. at $%p", devnum, uvd);
983 /* Not relying upon caller we increase module counter ourselves */
984 usbvideo_ClientIncModCount(uvd);
986 mutex_lock(&uvd->lock);
987 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
988 uvd->sbuf[i].urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
989 if (uvd->sbuf[i].urb == NULL) {
990 err("usb_alloc_urb(%d.) failed.", FRAMES_PER_DESC);
997 uvd->remove_pending = 0;
999 RingQueue_Initialize(&uvd->dp);
1001 /* Initialize video device structure */
1002 uvd->vdev = usbvideo_template;
1003 sprintf(uvd->vdev.name, "%.20s USB Camera", cams->drvName);
1005 * The client is free to overwrite those because we
1006 * return control to the client's probe function right now.
1009 mutex_unlock(&uvd->lock);
1010 usbvideo_ClientDecModCount(uvd);
1014 EXPORT_SYMBOL(usbvideo_AllocateDevice);
1016 int usbvideo_RegisterVideoDevice(struct uvd *uvd)
1018 char tmp1[20], tmp2[20]; /* Buffers for printing */
1021 err("%s: Illegal call.", __FUNCTION__);
1024 if (uvd->video_endp == 0) {
1025 info("%s: No video endpoint specified; data pump disabled.", __FUNCTION__);
1027 if (uvd->paletteBits == 0) {
1028 err("%s: No palettes specified!", __FUNCTION__);
1031 if (uvd->defaultPalette == 0) {
1032 info("%s: No default palette!", __FUNCTION__);
1035 uvd->max_frame_size = VIDEOSIZE_X(uvd->canvas) *
1036 VIDEOSIZE_Y(uvd->canvas) * V4L_BYTES_PER_PIXEL;
1037 usbvideo_VideosizeToString(tmp1, sizeof(tmp1), uvd->videosize);
1038 usbvideo_VideosizeToString(tmp2, sizeof(tmp2), uvd->canvas);
1040 if (uvd->debug > 0) {
1041 info("%s: iface=%d. endpoint=$%02x paletteBits=$%08lx",
1042 __FUNCTION__, uvd->iface, uvd->video_endp, uvd->paletteBits);
1044 if (video_register_device(&uvd->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
1045 err("%s: video_register_device failed", __FUNCTION__);
1048 if (uvd->debug > 1) {
1049 info("%s: video_register_device() successful", __FUNCTION__);
1051 if (uvd->dev == NULL) {
1052 err("%s: uvd->dev == NULL", __FUNCTION__);
1056 info("%s on /dev/video%d: canvas=%s videosize=%s",
1057 (uvd->handle != NULL) ? uvd->handle->drvName : "???",
1058 uvd->vdev.minor, tmp2, tmp1);
1060 usb_get_dev(uvd->dev);
1064 EXPORT_SYMBOL(usbvideo_RegisterVideoDevice);
1066 /* ******************************************************************** */
1068 static int usbvideo_v4l_mmap(struct file *file, struct vm_area_struct *vma)
1070 struct uvd *uvd = file->private_data;
1071 unsigned long start = vma->vm_start;
1072 unsigned long size = vma->vm_end-vma->vm_start;
1073 unsigned long page, pos;
1075 if (!CAMERA_IS_OPERATIONAL(uvd))
1078 if (size > (((USBVIDEO_NUMFRAMES * uvd->max_frame_size) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)))
1081 pos = (unsigned long) uvd->fbuf;
1083 page = vmalloc_to_pfn((void *)pos);
1084 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
1089 if (size > PAGE_SIZE)
1099 * usbvideo_v4l_open()
1101 * This is part of Video 4 Linux API. The driver can be opened by one
1102 * client only (checks internal counter 'uvdser'). The procedure
1103 * then allocates buffers needed for video processing.
1106 * 22-Jan-2000 Rewrote, moved scratch buffer allocation here. Now the
1107 * camera is also initialized here (once per connect), at
1108 * expense of V4L client (it waits on open() call).
1109 * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
1110 * 24-May-2000 Corrected to prevent race condition (MOD_xxx_USE_COUNT).
1112 static int usbvideo_v4l_open(struct inode *inode, struct file *file)
1114 struct video_device *dev = video_devdata(file);
1115 struct uvd *uvd = (struct uvd *) dev;
1116 const int sb_size = FRAMES_PER_DESC * uvd->iso_packet_len;
1120 info("%s($%p)", __FUNCTION__, dev);
1122 usbvideo_ClientIncModCount(uvd);
1123 mutex_lock(&uvd->lock);
1126 err("%s: Someone tried to open an already opened device!", __FUNCTION__);
1129 /* Clear statistics */
1130 memset(&uvd->stats, 0, sizeof(uvd->stats));
1132 /* Clean pointers so we know if we allocated something */
1133 for (i=0; i < USBVIDEO_NUMSBUF; i++)
1134 uvd->sbuf[i].data = NULL;
1136 /* Allocate memory for the frame buffers */
1137 uvd->fbuf_size = USBVIDEO_NUMFRAMES * uvd->max_frame_size;
1138 uvd->fbuf = usbvideo_rvmalloc(uvd->fbuf_size);
1139 RingQueue_Allocate(&uvd->dp, RING_QUEUE_SIZE);
1140 if ((uvd->fbuf == NULL) ||
1141 (!RingQueue_IsAllocated(&uvd->dp))) {
1142 err("%s: Failed to allocate fbuf or dp", __FUNCTION__);
1145 /* Allocate all buffers */
1146 for (i=0; i < USBVIDEO_NUMFRAMES; i++) {
1147 uvd->frame[i].frameState = FrameState_Unused;
1148 uvd->frame[i].data = uvd->fbuf + i*(uvd->max_frame_size);
1150 * Set default sizes in case IOCTL (VIDIOCMCAPTURE)
1151 * is not used (using read() instead).
1153 uvd->frame[i].canvas = uvd->canvas;
1154 uvd->frame[i].seqRead_Index = 0;
1156 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1157 uvd->sbuf[i].data = kmalloc(sb_size, GFP_KERNEL);
1158 if (uvd->sbuf[i].data == NULL) {
1165 /* Have to free all that memory */
1166 if (uvd->fbuf != NULL) {
1167 usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
1170 RingQueue_Free(&uvd->dp);
1171 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1172 kfree(uvd->sbuf[i].data);
1173 uvd->sbuf[i].data = NULL;
1178 /* If so far no errors then we shall start the camera */
1180 /* Start data pump if we have valid endpoint */
1181 if (uvd->video_endp != 0)
1182 errCode = GET_CALLBACK(uvd, startDataPump)(uvd);
1184 if (VALID_CALLBACK(uvd, setupOnOpen)) {
1186 info("%s: setupOnOpen callback", __FUNCTION__);
1187 errCode = GET_CALLBACK(uvd, setupOnOpen)(uvd);
1189 err("%s: setupOnOpen callback failed (%d.).",
1190 __FUNCTION__, errCode);
1191 } else if (uvd->debug > 1) {
1192 info("%s: setupOnOpen callback successful", __FUNCTION__);
1196 uvd->settingsAdjusted = 0;
1198 info("%s: Open succeeded.", __FUNCTION__);
1200 file->private_data = uvd;
1204 mutex_unlock(&uvd->lock);
1206 usbvideo_ClientDecModCount(uvd);
1208 info("%s: Returning %d.", __FUNCTION__, errCode);
1213 * usbvideo_v4l_close()
1215 * This is part of Video 4 Linux API. The procedure
1216 * stops streaming and deallocates all buffers that were earlier
1217 * allocated in usbvideo_v4l_open().
1220 * 22-Jan-2000 Moved scratch buffer deallocation here.
1221 * 27-Jan-2000 Used USBVIDEO_NUMSBUF as number of URB buffers.
1222 * 24-May-2000 Moved MOD_DEC_USE_COUNT outside of code that can sleep.
1224 static int usbvideo_v4l_close(struct inode *inode, struct file *file)
1226 struct video_device *dev = file->private_data;
1227 struct uvd *uvd = (struct uvd *) dev;
1231 info("%s($%p)", __FUNCTION__, dev);
1233 mutex_lock(&uvd->lock);
1234 GET_CALLBACK(uvd, stopDataPump)(uvd);
1235 usbvideo_rvfree(uvd->fbuf, uvd->fbuf_size);
1237 RingQueue_Free(&uvd->dp);
1239 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1240 kfree(uvd->sbuf[i].data);
1241 uvd->sbuf[i].data = NULL;
1244 #if USBVIDEO_REPORT_STATS
1245 usbvideo_ReportStatistics(uvd);
1249 if (uvd->remove_pending) {
1251 info("usbvideo_v4l_close: Final disconnect.");
1252 usbvideo_CameraRelease(uvd);
1254 mutex_unlock(&uvd->lock);
1255 usbvideo_ClientDecModCount(uvd);
1258 info("%s: Completed.", __FUNCTION__);
1259 file->private_data = NULL;
1264 * usbvideo_v4l_ioctl()
1266 * This is part of Video 4 Linux API. The procedure handles ioctl() calls.
1269 * 22-Jan-2000 Corrected VIDIOCSPICT to reject unsupported settings.
1271 static int usbvideo_v4l_do_ioctl(struct inode *inode, struct file *file,
1272 unsigned int cmd, void *arg)
1274 struct uvd *uvd = file->private_data;
1276 if (!CAMERA_IS_OPERATIONAL(uvd))
1282 struct video_capability *b = arg;
1288 struct video_channel *v = arg;
1294 struct video_channel *v = arg;
1295 if (v->channel != 0)
1301 struct video_picture *pic = arg;
1307 struct video_picture *pic = arg;
1309 * Use temporary 'video_picture' structure to preserve our
1310 * own settings (such as color depth, palette) that we
1311 * aren't allowing everyone (V4L client) to change.
1313 uvd->vpic.brightness = pic->brightness;
1314 uvd->vpic.hue = pic->hue;
1315 uvd->vpic.colour = pic->colour;
1316 uvd->vpic.contrast = pic->contrast;
1317 uvd->settingsAdjusted = 0; /* Will force new settings */
1322 struct video_window *vw = arg;
1324 if(VALID_CALLBACK(uvd, setVideoMode)) {
1325 return GET_CALLBACK(uvd, setVideoMode)(uvd, vw);
1332 if (vw->width != VIDEOSIZE_X(uvd->canvas))
1334 if (vw->height != VIDEOSIZE_Y(uvd->canvas))
1341 struct video_window *vw = arg;
1345 vw->width = VIDEOSIZE_X(uvd->videosize);
1346 vw->height = VIDEOSIZE_Y(uvd->videosize);
1348 if (VALID_CALLBACK(uvd, getFPS))
1349 vw->flags = GET_CALLBACK(uvd, getFPS)(uvd);
1351 vw->flags = 10; /* FIXME: do better! */
1356 struct video_mbuf *vm = arg;
1359 memset(vm, 0, sizeof(*vm));
1360 vm->size = uvd->max_frame_size * USBVIDEO_NUMFRAMES;
1361 vm->frames = USBVIDEO_NUMFRAMES;
1362 for(i = 0; i < USBVIDEO_NUMFRAMES; i++)
1363 vm->offsets[i] = i * uvd->max_frame_size;
1367 case VIDIOCMCAPTURE:
1369 struct video_mmap *vm = arg;
1371 if (uvd->debug >= 1) {
1372 info("VIDIOCMCAPTURE: frame=%d. size=%dx%d, format=%d.",
1373 vm->frame, vm->width, vm->height, vm->format);
1376 * Check if the requested size is supported. If the requestor
1377 * requests too big a frame then we may be tricked into accessing
1378 * outside of own preallocated frame buffer (in uvd->frame).
1379 * This will cause oops or a security hole. Theoretically, we
1380 * could only clamp the size down to acceptable bounds, but then
1381 * we'd need to figure out how to insert our smaller buffer into
1382 * larger caller's buffer... this is not an easy question. So we
1383 * here just flatly reject too large requests, assuming that the
1384 * caller will resubmit with smaller size. Callers should know
1385 * what size we support (returned by VIDIOCGCAP). However vidcat,
1386 * for one, does not care and allows to ask for any size.
1388 if ((vm->width > VIDEOSIZE_X(uvd->canvas)) ||
1389 (vm->height > VIDEOSIZE_Y(uvd->canvas))) {
1390 if (uvd->debug > 0) {
1391 info("VIDIOCMCAPTURE: Size=%dx%d too large; "
1392 "allowed only up to %ldx%ld", vm->width, vm->height,
1393 VIDEOSIZE_X(uvd->canvas), VIDEOSIZE_Y(uvd->canvas));
1397 /* Check if the palette is supported */
1398 if (((1L << vm->format) & uvd->paletteBits) == 0) {
1399 if (uvd->debug > 0) {
1400 info("VIDIOCMCAPTURE: format=%d. not supported"
1401 " (paletteBits=$%08lx)",
1402 vm->format, uvd->paletteBits);
1406 if ((vm->frame < 0) || (vm->frame >= USBVIDEO_NUMFRAMES)) {
1407 err("VIDIOCMCAPTURE: vm.frame=%d. !E [0-%d]", vm->frame, USBVIDEO_NUMFRAMES-1);
1410 if (uvd->frame[vm->frame].frameState == FrameState_Grabbing) {
1411 /* Not an error - can happen */
1413 uvd->frame[vm->frame].request = VIDEOSIZE(vm->width, vm->height);
1414 uvd->frame[vm->frame].palette = vm->format;
1416 /* Mark it as ready */
1417 uvd->frame[vm->frame].frameState = FrameState_Ready;
1419 return usbvideo_NewFrame(uvd, vm->frame);
1423 int *frameNum = arg;
1426 if (*frameNum < 0 || *frameNum >= USBVIDEO_NUMFRAMES)
1429 if (uvd->debug >= 1)
1430 info("VIDIOCSYNC: syncing to frame %d.", *frameNum);
1431 if (uvd->flags & FLAGS_NO_DECODING)
1432 ret = usbvideo_GetFrame(uvd, *frameNum);
1433 else if (VALID_CALLBACK(uvd, getFrame)) {
1434 ret = GET_CALLBACK(uvd, getFrame)(uvd, *frameNum);
1435 if ((ret < 0) && (uvd->debug >= 1)) {
1436 err("VIDIOCSYNC: getFrame() returned %d.", ret);
1439 err("VIDIOCSYNC: getFrame is not set");
1444 * The frame is in FrameState_Done_Hold state. Release it
1445 * right now because its data is already mapped into
1446 * the user space and it's up to the application to
1447 * make use of it until it asks for another frame.
1449 uvd->frame[*frameNum].frameState = FrameState_Unused;
1454 struct video_buffer *vb = arg;
1456 memset(vb, 0, sizeof(*vb));
1478 return -ENOIOCTLCMD;
1483 static int usbvideo_v4l_ioctl(struct inode *inode, struct file *file,
1484 unsigned int cmd, unsigned long arg)
1486 return video_usercopy(inode, file, cmd, arg, usbvideo_v4l_do_ioctl);
1490 * usbvideo_v4l_read()
1492 * This is mostly boring stuff. We simply ask for a frame and when it
1493 * arrives copy all the video data from it into user space. There is
1494 * no obvious need to override this method.
1497 * 20-Oct-2000 Created.
1498 * 01-Nov-2000 Added mutex (uvd->lock).
1500 static ssize_t usbvideo_v4l_read(struct file *file, char __user *buf,
1501 size_t count, loff_t *ppos)
1503 struct uvd *uvd = file->private_data;
1504 int noblock = file->f_flags & O_NONBLOCK;
1506 struct usbvideo_frame *frame;
1508 if (!CAMERA_IS_OPERATIONAL(uvd) || (buf == NULL))
1511 if (uvd->debug >= 1)
1512 info("%s: %Zd. bytes, noblock=%d.", __FUNCTION__, count, noblock);
1514 mutex_lock(&uvd->lock);
1516 /* See if a frame is completed, then use it. */
1517 for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
1518 if ((uvd->frame[i].frameState == FrameState_Done) ||
1519 (uvd->frame[i].frameState == FrameState_Done_Hold) ||
1520 (uvd->frame[i].frameState == FrameState_Error)) {
1526 /* FIXME: If we don't start a frame here then who ever does? */
1527 if (noblock && (frmx == -1)) {
1533 * If no FrameState_Done, look for a FrameState_Grabbing state.
1534 * See if a frame is in process (grabbing), then use it.
1535 * We will need to wait until it becomes cooked, of course.
1538 for(i = 0; i < USBVIDEO_NUMFRAMES; i++) {
1539 if (uvd->frame[i].frameState == FrameState_Grabbing) {
1547 * If no frame is active, start one. We don't care which one
1548 * it will be, so #0 is as good as any.
1549 * In read access mode we don't have convenience of VIDIOCMCAPTURE
1550 * to specify the requested palette (video format) on per-frame
1551 * basis. This means that we have to return data in -some- format
1552 * and just hope that the client knows what to do with it.
1553 * The default format is configured in uvd->defaultPalette field
1554 * as one of VIDEO_PALETTE_xxx values. We stuff it into the new
1555 * frame and initiate the frame filling process.
1558 if (uvd->defaultPalette == 0) {
1559 err("%s: No default palette; don't know what to do!", __FUNCTION__);
1565 * We have no per-frame control over video size.
1566 * Therefore we only can use whatever size was
1567 * specified as default.
1569 uvd->frame[frmx].request = uvd->videosize;
1570 uvd->frame[frmx].palette = uvd->defaultPalette;
1571 uvd->frame[frmx].frameState = FrameState_Ready;
1572 usbvideo_NewFrame(uvd, frmx);
1573 /* Now frame 0 is supposed to start filling... */
1577 * Get a pointer to the active frame. It is either previously
1578 * completed frame or frame in progress but not completed yet.
1580 frame = &uvd->frame[frmx];
1583 * Sit back & wait until the frame gets filled and postprocessed.
1584 * If we fail to get the picture [in time] then return the error.
1585 * In this call we specify that we want the frame to be waited for,
1586 * postprocessed and switched into FrameState_Done_Hold state. This
1587 * state is used to hold the frame as "fully completed" between
1588 * subsequent partial reads of the same frame.
1590 if (frame->frameState != FrameState_Done_Hold) {
1592 if (uvd->flags & FLAGS_NO_DECODING)
1593 rv = usbvideo_GetFrame(uvd, frmx);
1594 else if (VALID_CALLBACK(uvd, getFrame))
1595 rv = GET_CALLBACK(uvd, getFrame)(uvd, frmx);
1597 err("getFrame is not set");
1598 if ((rv != 0) || (frame->frameState != FrameState_Done_Hold)) {
1605 * Copy bytes to user space. We allow for partial reads, which
1606 * means that the user application can request read less than
1607 * the full frame size. It is up to the application to issue
1608 * subsequent calls until entire frame is read.
1610 * First things first, make sure we don't copy more than we
1611 * have - even if the application wants more. That would be
1612 * a big security embarassment!
1614 if ((count + frame->seqRead_Index) > frame->seqRead_Length)
1615 count = frame->seqRead_Length - frame->seqRead_Index;
1618 * Copy requested amount of data to user space. We start
1619 * copying from the position where we last left it, which
1620 * will be zero for a new frame (not read before).
1622 if (copy_to_user(buf, frame->data + frame->seqRead_Index, count)) {
1627 /* Update last read position */
1628 frame->seqRead_Index += count;
1629 if (uvd->debug >= 1) {
1630 err("%s: {copy} count used=%Zd, new seqRead_Index=%ld",
1631 __FUNCTION__, count, frame->seqRead_Index);
1634 /* Finally check if the frame is done with and "release" it */
1635 if (frame->seqRead_Index >= frame->seqRead_Length) {
1636 /* All data has been read */
1637 frame->seqRead_Index = 0;
1639 /* Mark it as available to be used again. */
1640 uvd->frame[frmx].frameState = FrameState_Unused;
1641 if (usbvideo_NewFrame(uvd, (frmx + 1) % USBVIDEO_NUMFRAMES)) {
1642 err("%s: usbvideo_NewFrame failed.", __FUNCTION__);
1646 mutex_unlock(&uvd->lock);
1651 * Make all of the blocks of data contiguous
1653 static int usbvideo_CompressIsochronous(struct uvd *uvd, struct urb *urb)
1658 for (i = 0; i < urb->number_of_packets; i++) {
1659 int n = urb->iso_frame_desc[i].actual_length;
1660 int st = urb->iso_frame_desc[i].status;
1662 cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1664 /* Detect and ignore errored packets */
1666 if (uvd->debug >= 1)
1667 err("Data error: packet=%d. len=%d. status=%d.", i, n, st);
1668 uvd->stats.iso_err_count++;
1672 /* Detect and ignore empty packets */
1674 uvd->stats.iso_skip_count++;
1677 totlen += n; /* Little local accounting */
1678 RingQueue_Enqueue(&uvd->dp, cdata, n);
1683 static void usbvideo_IsocIrq(struct urb *urb, struct pt_regs *regs)
1686 struct uvd *uvd = urb->context;
1688 /* We don't want to do anything if we are about to be removed! */
1689 if (!CAMERA_IS_OPERATIONAL(uvd))
1692 if (urb->actual_length > 0) {
1693 info("urb=$%p status=%d. errcount=%d. length=%d.",
1694 urb, urb->status, urb->error_count, urb->actual_length);
1698 info("No Isoc data");
1702 if (!uvd->streaming) {
1703 if (uvd->debug >= 1)
1704 info("Not streaming, but interrupt!");
1708 uvd->stats.urb_count++;
1709 if (urb->actual_length <= 0)
1712 /* Copy the data received into ring queue */
1713 len = usbvideo_CompressIsochronous(uvd, urb);
1714 uvd->stats.urb_length = len;
1718 /* Here we got some data */
1719 uvd->stats.data_count += len;
1720 RingQueue_WakeUpInterruptible(&uvd->dp);
1723 for (i = 0; i < FRAMES_PER_DESC; i++) {
1724 urb->iso_frame_desc[i].status = 0;
1725 urb->iso_frame_desc[i].actual_length = 0;
1728 urb->dev = uvd->dev;
1729 ret = usb_submit_urb (urb, GFP_KERNEL);
1731 err("usb_submit_urb error (%d)", ret);
1736 * usbvideo_StartDataPump()
1739 * 27-Jan-2000 Used ibmcam->iface, ibmcam->ifaceAltActive instead
1740 * of hardcoded values. Simplified by using for loop,
1741 * allowed any number of URBs.
1743 static int usbvideo_StartDataPump(struct uvd *uvd)
1745 struct usb_device *dev = uvd->dev;
1749 info("%s($%p)", __FUNCTION__, uvd);
1751 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1752 err("%s: Camera is not operational", __FUNCTION__);
1757 /* Alternate interface 1 is is the biggest frame size */
1758 i = usb_set_interface(dev, uvd->iface, uvd->ifaceAltActive);
1760 err("%s: usb_set_interface error", __FUNCTION__);
1761 uvd->last_error = i;
1764 if (VALID_CALLBACK(uvd, videoStart))
1765 GET_CALLBACK(uvd, videoStart)(uvd);
1767 err("%s: videoStart not set", __FUNCTION__);
1769 /* We double buffer the Iso lists */
1770 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1772 struct urb *urb = uvd->sbuf[i].urb;
1775 urb->pipe = usb_rcvisocpipe(dev, uvd->video_endp);
1777 urb->transfer_flags = URB_ISO_ASAP;
1778 urb->transfer_buffer = uvd->sbuf[i].data;
1779 urb->complete = usbvideo_IsocIrq;
1780 urb->number_of_packets = FRAMES_PER_DESC;
1781 urb->transfer_buffer_length = uvd->iso_packet_len * FRAMES_PER_DESC;
1782 for (j=k=0; j < FRAMES_PER_DESC; j++, k += uvd->iso_packet_len) {
1783 urb->iso_frame_desc[j].offset = k;
1784 urb->iso_frame_desc[j].length = uvd->iso_packet_len;
1788 /* Submit all URBs */
1789 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1790 errFlag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
1792 err("%s: usb_submit_isoc(%d) ret %d", __FUNCTION__, i, errFlag);
1797 info("%s: streaming=1 video_endp=$%02x", __FUNCTION__, uvd->video_endp);
1802 * usbvideo_StopDataPump()
1804 * This procedure stops streaming and deallocates URBs. Then it
1805 * activates zero-bandwidth alt. setting of the video interface.
1808 * 22-Jan-2000 Corrected order of actions to work after surprise removal.
1809 * 27-Jan-2000 Used uvd->iface, uvd->ifaceAltInactive instead of hardcoded values.
1811 static void usbvideo_StopDataPump(struct uvd *uvd)
1815 if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
1819 info("%s($%p)", __FUNCTION__, uvd);
1821 /* Unschedule all of the iso td's */
1822 for (i=0; i < USBVIDEO_NUMSBUF; i++) {
1823 usb_kill_urb(uvd->sbuf[i].urb);
1826 info("%s: streaming=0", __FUNCTION__);
1829 if (!uvd->remove_pending) {
1830 /* Invoke minidriver's magic to stop the camera */
1831 if (VALID_CALLBACK(uvd, videoStop))
1832 GET_CALLBACK(uvd, videoStop)(uvd);
1834 err("%s: videoStop not set", __FUNCTION__);
1836 /* Set packet size to 0 */
1837 j = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltInactive);
1839 err("%s: usb_set_interface() error %d.", __FUNCTION__, j);
1840 uvd->last_error = j;
1846 * usbvideo_NewFrame()
1849 * 29-Mar-00 Added copying of previous frame into the current one.
1850 * 6-Aug-00 Added model 3 video sizes, removed redundant width, height.
1852 static int usbvideo_NewFrame(struct uvd *uvd, int framenum)
1854 struct usbvideo_frame *frame;
1858 info("usbvideo_NewFrame($%p,%d.)", uvd, framenum);
1860 /* If we're not grabbing a frame right now and the other frame is */
1861 /* ready to be grabbed into, then use it instead */
1862 if (uvd->curframe != -1)
1865 /* If necessary we adjust picture settings between frames */
1866 if (!uvd->settingsAdjusted) {
1867 if (VALID_CALLBACK(uvd, adjustPicture))
1868 GET_CALLBACK(uvd, adjustPicture)(uvd);
1869 uvd->settingsAdjusted = 1;
1872 n = (framenum + 1) % USBVIDEO_NUMFRAMES;
1873 if (uvd->frame[n].frameState == FrameState_Ready)
1876 frame = &uvd->frame[framenum];
1878 frame->frameState = FrameState_Grabbing;
1879 frame->scanstate = ScanState_Scanning;
1880 frame->seqRead_Length = 0; /* Accumulated in xxx_parse_data() */
1881 frame->deinterlace = Deinterlace_None;
1882 frame->flags = 0; /* No flags yet, up to minidriver (or us) to set them */
1883 uvd->curframe = framenum;
1886 * Normally we would want to copy previous frame into the current one
1887 * before we even start filling it with data; this allows us to stop
1888 * filling at any moment; top portion of the frame will be new and
1889 * bottom portion will stay as it was in previous frame. If we don't
1890 * do that then missing chunks of video stream will result in flickering
1891 * portions of old data whatever it was before.
1893 * If we choose not to copy previous frame (to, for example, save few
1894 * bus cycles - the frame can be pretty large!) then we have an option
1895 * to clear the frame before using. If we experience losses in this
1896 * mode then missing picture will be black (no flickering).
1898 * Finally, if user chooses not to clean the current frame before
1899 * filling it with data then the old data will be visible if we fail
1900 * to refill entire frame with new data.
1902 if (!(uvd->flags & FLAGS_SEPARATE_FRAMES)) {
1903 /* This copies previous frame into this one to mask losses */
1904 int prev = (framenum - 1 + USBVIDEO_NUMFRAMES) % USBVIDEO_NUMFRAMES;
1905 memmove(frame->data, uvd->frame[prev].data, uvd->max_frame_size);
1907 if (uvd->flags & FLAGS_CLEAN_FRAMES) {
1908 /* This provides a "clean" frame but slows things down */
1909 memset(frame->data, 0, uvd->max_frame_size);
1916 * usbvideo_CollectRawData()
1918 * This procedure can be used instead of 'processData' callback if you
1919 * only want to dump the raw data from the camera into the output
1920 * device (frame buffer). You can look at it with V4L client, but the
1921 * image will be unwatchable. The main purpose of this code and of the
1922 * mode FLAGS_NO_DECODING is debugging and capturing of datastreams from
1923 * new, unknown cameras. This procedure will be automatically invoked
1924 * instead of the specified callback handler when uvd->flags has bit
1925 * FLAGS_NO_DECODING set. Therefore, any regular build of any driver
1926 * based on usbvideo can use this feature at any time.
1928 static void usbvideo_CollectRawData(struct uvd *uvd, struct usbvideo_frame *frame)
1932 assert(uvd != NULL);
1933 assert(frame != NULL);
1935 /* Try to move data from queue into frame buffer */
1936 n = RingQueue_GetLength(&uvd->dp);
1939 /* See how much space we have left */
1940 m = uvd->max_frame_size - frame->seqRead_Length;
1943 /* Now move that much data into frame buffer */
1946 frame->data + frame->seqRead_Length,
1948 frame->seqRead_Length += m;
1950 /* See if we filled the frame */
1951 if (frame->seqRead_Length >= uvd->max_frame_size) {
1952 frame->frameState = FrameState_Done;
1954 uvd->stats.frame_num++;
1958 static int usbvideo_GetFrame(struct uvd *uvd, int frameNum)
1960 struct usbvideo_frame *frame = &uvd->frame[frameNum];
1962 if (uvd->debug >= 2)
1963 info("%s($%p,%d.)", __FUNCTION__, uvd, frameNum);
1965 switch (frame->frameState) {
1966 case FrameState_Unused:
1967 if (uvd->debug >= 2)
1968 info("%s: FrameState_Unused", __FUNCTION__);
1970 case FrameState_Ready:
1971 case FrameState_Grabbing:
1972 case FrameState_Error:
1974 int ntries, signalPending;
1976 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1977 if (uvd->debug >= 2)
1978 info("%s: Camera is not operational (1)", __FUNCTION__);
1983 RingQueue_InterruptibleSleepOn(&uvd->dp);
1984 signalPending = signal_pending(current);
1985 if (!CAMERA_IS_OPERATIONAL(uvd)) {
1986 if (uvd->debug >= 2)
1987 info("%s: Camera is not operational (2)", __FUNCTION__);
1990 assert(uvd->fbuf != NULL);
1991 if (signalPending) {
1992 if (uvd->debug >= 2)
1993 info("%s: Signal=$%08x", __FUNCTION__, signalPending);
1994 if (uvd->flags & FLAGS_RETRY_VIDIOCSYNC) {
1995 usbvideo_TestPattern(uvd, 1, 0);
1997 uvd->stats.frame_num++;
1998 if (uvd->debug >= 2)
1999 info("%s: Forced test pattern screen", __FUNCTION__);
2002 /* Standard answer: Interrupted! */
2003 if (uvd->debug >= 2)
2004 info("%s: Interrupted!", __FUNCTION__);
2008 /* No signals - we just got new data in dp queue */
2009 if (uvd->flags & FLAGS_NO_DECODING)
2010 usbvideo_CollectRawData(uvd, frame);
2011 else if (VALID_CALLBACK(uvd, processData))
2012 GET_CALLBACK(uvd, processData)(uvd, frame);
2014 err("%s: processData not set", __FUNCTION__);
2016 } while (frame->frameState == FrameState_Grabbing);
2017 if (uvd->debug >= 2) {
2018 info("%s: Grabbing done; state=%d. (%lu. bytes)",
2019 __FUNCTION__, frame->frameState, frame->seqRead_Length);
2021 if (frame->frameState == FrameState_Error) {
2022 int ret = usbvideo_NewFrame(uvd, frameNum);
2024 err("%s: usbvideo_NewFrame() failed (%d.)", __FUNCTION__, ret);
2029 /* Note that we fall through to meet our destiny below */
2031 case FrameState_Done:
2033 * Do all necessary postprocessing of data prepared in
2034 * "interrupt" code and the collecting code above. The
2035 * frame gets marked as FrameState_Done by queue parsing code.
2036 * This status means that we collected enough data and
2037 * most likely processed it as we went through. However
2038 * the data may need postprocessing, such as deinterlacing
2039 * or picture adjustments implemented in software (horror!)
2041 * As soon as the frame becomes "final" it gets promoted to
2042 * FrameState_Done_Hold status where it will remain until the
2043 * caller consumed all the video data from the frame. Then
2044 * the empty shell of ex-frame is thrown out for dogs to eat.
2045 * But we, worried about pets, will recycle the frame!
2047 uvd->stats.frame_num++;
2048 if ((uvd->flags & FLAGS_NO_DECODING) == 0) {
2049 if (VALID_CALLBACK(uvd, postProcess))
2050 GET_CALLBACK(uvd, postProcess)(uvd, frame);
2051 if (frame->flags & USBVIDEO_FRAME_FLAG_SOFTWARE_CONTRAST)
2052 usbvideo_SoftwareContrastAdjustment(uvd, frame);
2054 frame->frameState = FrameState_Done_Hold;
2055 if (uvd->debug >= 2)
2056 info("%s: Entered FrameState_Done_Hold state.", __FUNCTION__);
2059 case FrameState_Done_Hold:
2061 * We stay in this state indefinitely until someone external,
2062 * like ioctl() or read() call finishes digesting the frame
2063 * data. Then it will mark the frame as FrameState_Unused and
2064 * it will be released back into the wild to roam freely.
2066 if (uvd->debug >= 2)
2067 info("%s: FrameState_Done_Hold state.", __FUNCTION__);
2071 /* Catch-all for other cases. We shall not be here. */
2072 err("%s: Invalid state %d.", __FUNCTION__, frame->frameState);
2073 frame->frameState = FrameState_Unused;
2078 * usbvideo_DeinterlaceFrame()
2080 * This procedure deinterlaces the given frame. Some cameras produce
2081 * only half of scanlines - sometimes only even lines, sometimes only
2082 * odd lines. The deinterlacing method is stored in frame->deinterlace
2085 * Here we scan the frame vertically and replace missing scanlines with
2086 * average between surrounding ones - before and after. If we have no
2087 * line above then we just copy next line. Similarly, if we need to
2088 * create a last line then preceding line is used.
2090 void usbvideo_DeinterlaceFrame(struct uvd *uvd, struct usbvideo_frame *frame)
2092 if ((uvd == NULL) || (frame == NULL))
2095 if ((frame->deinterlace == Deinterlace_FillEvenLines) ||
2096 (frame->deinterlace == Deinterlace_FillOddLines))
2098 const int v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
2099 int i = (frame->deinterlace == Deinterlace_FillEvenLines) ? 0 : 1;
2101 for (; i < VIDEOSIZE_Y(frame->request); i += 2) {
2102 const unsigned char *fs1, *fs2;
2104 int ip, in, j; /* Previous and next lines */
2107 * Need to average lines before and after 'i'.
2108 * If we go out of bounds seeking those lines then
2109 * we point back to existing line.
2111 ip = i - 1; /* First, get rough numbers */
2117 if (in >= VIDEOSIZE_Y(frame->request))
2121 if ((ip < 0) || (in < 0) ||
2122 (ip >= VIDEOSIZE_Y(frame->request)) ||
2123 (in >= VIDEOSIZE_Y(frame->request)))
2125 err("Error: ip=%d. in=%d. req.height=%ld.",
2126 ip, in, VIDEOSIZE_Y(frame->request));
2130 /* Now we need to average lines 'ip' and 'in' to produce line 'i' */
2131 fs1 = frame->data + (v4l_linesize * ip);
2132 fs2 = frame->data + (v4l_linesize * in);
2133 fd = frame->data + (v4l_linesize * i);
2135 /* Average lines around destination */
2136 for (j=0; j < v4l_linesize; j++) {
2137 fd[j] = (unsigned char)((((unsigned) fs1[j]) +
2138 ((unsigned)fs2[j])) >> 1);
2143 /* Optionally display statistics on the screen */
2144 if (uvd->flags & FLAGS_OVERLAY_STATS)
2145 usbvideo_OverlayStats(uvd, frame);
2148 EXPORT_SYMBOL(usbvideo_DeinterlaceFrame);
2151 * usbvideo_SoftwareContrastAdjustment()
2153 * This code adjusts the contrast of the frame, assuming RGB24 format.
2154 * As most software image processing, this job is CPU-intensive.
2155 * Get a camera that supports hardware adjustment!
2158 * 09-Feb-2001 Created.
2160 static void usbvideo_SoftwareContrastAdjustment(struct uvd *uvd,
2161 struct usbvideo_frame *frame)
2163 int i, j, v4l_linesize;
2165 const int ccm = 128; /* Color correction median - see below */
2167 if ((uvd == NULL) || (frame == NULL)) {
2168 err("%s: Illegal call.", __FUNCTION__);
2171 adj = (uvd->vpic.contrast - 0x8000) >> 8; /* -128..+127 = -ccm..+(ccm-1)*/
2172 RESTRICT_TO_RANGE(adj, -ccm, ccm+1);
2174 /* In rare case of no adjustment */
2177 v4l_linesize = VIDEOSIZE_X(frame->request) * V4L_BYTES_PER_PIXEL;
2178 for (i=0; i < VIDEOSIZE_Y(frame->request); i++) {
2179 unsigned char *fd = frame->data + (v4l_linesize * i);
2180 for (j=0; j < v4l_linesize; j++) {
2181 signed long v = (signed long) fd[j];
2182 /* Magnify up to 2 times, reduce down to zero */
2183 v = 128 + ((ccm + adj) * (v - 128)) / ccm;
2184 RESTRICT_TO_RANGE(v, 0, 0xFF); /* Must flatten tails */
2185 fd[j] = (unsigned char) v;
2190 MODULE_LICENSE("GPL");