2 * Main USB camera driver
4 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #define MODULE_NAME "gspca"
23 #include <linux/init.h>
25 #include <linux/vmalloc.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
29 #include <linux/string.h>
30 #include <linux/pagemap.h>
32 #include <linux/kref.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
41 #define DEF_NURBS 2 /* default number of URBs */
43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
45 MODULE_LICENSE("GPL");
47 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 3, 0)
49 static int video_nr = -1;
52 int gspca_debug = D_ERR | D_PROBE;
53 EXPORT_SYMBOL(gspca_debug);
55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
58 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
62 (pixfmt >> 16) & 0xff,
66 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
73 #define PDEBUG_MODE(txt, pixfmt, w, h)
76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
77 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
78 #define GSPCA_MEMORY_READ 7
80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
85 static void gspca_vm_open(struct vm_area_struct *vma)
87 struct gspca_frame *frame = vma->vm_private_data;
89 frame->vma_use_count++;
90 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
93 static void gspca_vm_close(struct vm_area_struct *vma)
95 struct gspca_frame *frame = vma->vm_private_data;
97 if (--frame->vma_use_count <= 0)
98 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
101 static struct vm_operations_struct gspca_vm_ops = {
102 .open = gspca_vm_open,
103 .close = gspca_vm_close,
106 /* get the current input frame buffer */
107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 struct gspca_frame *frame;
113 i = gspca_dev->fr_queue[i];
114 frame = &gspca_dev->frame[i];
115 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
116 != V4L2_BUF_FLAG_QUEUED)
120 EXPORT_SYMBOL(gspca_get_i_frame);
123 * fill a video frame from an URB and resubmit
125 static void fill_frame(struct gspca_dev *gspca_dev,
128 struct gspca_frame *frame;
129 __u8 *data; /* address of data in the iso message */
133 if (urb->status != 0) {
135 if (!gspca_dev->frozen)
137 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
138 return; /* disconnection ? */
140 pkt_scan = gspca_dev->sd_desc->pkt_scan;
141 for (i = 0; i < urb->number_of_packets; i++) {
143 /* check the availability of the frame buffer */
144 frame = gspca_get_i_frame(gspca_dev);
146 gspca_dev->last_packet_type = DISCARD_PACKET;
150 /* check the packet status and length */
151 len = urb->iso_frame_desc[i].actual_length;
154 st = urb->iso_frame_desc[i].status;
157 "ISOC data error: [%d] len=%d, status=%d",
159 gspca_dev->last_packet_type = DISCARD_PACKET;
163 /* let the packet be analyzed by the subdriver */
164 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
165 i, urb->iso_frame_desc[i].offset, len);
166 data = (__u8 *) urb->transfer_buffer
167 + urb->iso_frame_desc[i].offset;
168 pkt_scan(gspca_dev, frame, data, len);
171 /* resubmit the URB */
173 st = usb_submit_urb(urb, GFP_ATOMIC);
175 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
179 * ISOC message interrupt from the USB device
181 * Analyse each packet and call the subdriver for copy to the frame buffer.
183 static void isoc_irq(struct urb *urb
186 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
188 PDEBUG(D_PACK, "isoc irq");
189 if (!gspca_dev->streaming)
191 fill_frame(gspca_dev, urb);
195 * bulk message interrupt from the USB device
197 static void bulk_irq(struct urb *urb
200 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
201 struct gspca_frame *frame;
203 PDEBUG(D_PACK, "bulk irq");
204 if (!gspca_dev->streaming)
206 if (urb->status != 0 && urb->status != -ECONNRESET) {
208 if (!gspca_dev->frozen)
210 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
211 return; /* disconnection ? */
214 /* check the availability of the frame buffer */
215 frame = gspca_get_i_frame(gspca_dev);
217 gspca_dev->last_packet_type = DISCARD_PACKET;
219 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
220 gspca_dev->sd_desc->pkt_scan(gspca_dev,
222 urb->transfer_buffer,
228 * add data to the current frame
230 * This function is called by the subdrivers at interrupt level.
232 * To build a frame, these ones must add
234 * - 0 or many INTER_PACKETs
236 * DISCARD_PACKET invalidates the whole frame.
237 * On LAST_PACKET, a new frame is returned.
239 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
241 struct gspca_frame *frame,
247 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
249 /* when start of a new frame, if the current frame buffer
250 * is not queued, discard the whole frame */
251 if (packet_type == FIRST_PACKET) {
252 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
253 != V4L2_BUF_FLAG_QUEUED) {
254 gspca_dev->last_packet_type = DISCARD_PACKET;
257 frame->data_end = frame->data;
258 jiffies_to_timeval(get_jiffies_64(),
259 &frame->v4l2_buf.timestamp);
260 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
261 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
262 if (packet_type == LAST_PACKET)
263 gspca_dev->last_packet_type = packet_type;
267 /* append the packet to the frame buffer */
269 if (frame->data_end - frame->data + len
270 > frame->v4l2_buf.length) {
271 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
272 frame->data_end - frame->data + len,
273 frame->v4l2_buf.length);
274 packet_type = DISCARD_PACKET;
276 memcpy(frame->data_end, data, len);
277 frame->data_end += len;
280 gspca_dev->last_packet_type = packet_type;
282 /* if last packet, wake up the application and advance in the queue */
283 if (packet_type == LAST_PACKET) {
284 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
285 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
286 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
287 atomic_inc(&gspca_dev->nevent);
288 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
289 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
291 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
292 frame->v4l2_buf.bytesused,
296 j = gspca_dev->fr_queue[i];
297 frame = &gspca_dev->frame[j];
301 EXPORT_SYMBOL(gspca_frame_add);
303 static int gspca_is_compressed(__u32 format)
306 case V4L2_PIX_FMT_MJPEG:
307 case V4L2_PIX_FMT_JPEG:
308 case V4L2_PIX_FMT_SPCA561:
309 case V4L2_PIX_FMT_PAC207:
315 static void *rvmalloc(unsigned long size)
320 /* size = PAGE_ALIGN(size); (already done) */
321 mem = vmalloc_32(size);
323 adr = (unsigned long) mem;
324 while ((long) size > 0) {
325 SetPageReserved(vmalloc_to_page((void *) adr));
333 static void rvfree(void *mem, long size)
337 adr = (unsigned long) mem;
339 ClearPageReserved(vmalloc_to_page((void *) adr));
346 static int frame_alloc(struct gspca_dev *gspca_dev,
349 struct gspca_frame *frame;
353 i = gspca_dev->curr_mode;
354 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
355 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
356 frsz = PAGE_ALIGN(frsz);
357 gspca_dev->frsz = frsz;
358 if (count > GSPCA_MAX_FRAMES)
359 count = GSPCA_MAX_FRAMES;
360 gspca_dev->frbuf = rvmalloc(frsz * count);
361 if (!gspca_dev->frbuf) {
362 err("frame alloc failed");
365 gspca_dev->nframes = count;
366 for (i = 0; i < count; i++) {
367 frame = &gspca_dev->frame[i];
368 frame->v4l2_buf.index = i;
369 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
370 frame->v4l2_buf.flags = 0;
371 frame->v4l2_buf.field = V4L2_FIELD_NONE;
372 frame->v4l2_buf.length = frsz;
373 frame->v4l2_buf.memory = gspca_dev->memory;
374 frame->v4l2_buf.sequence = 0;
375 frame->data = frame->data_end =
376 gspca_dev->frbuf + i * frsz;
377 frame->v4l2_buf.m.offset = i * frsz;
379 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
380 gspca_dev->last_packet_type = DISCARD_PACKET;
381 gspca_dev->sequence = 0;
382 atomic_set(&gspca_dev->nevent, 0);
386 static void frame_free(struct gspca_dev *gspca_dev)
390 PDEBUG(D_STREAM, "frame free");
391 if (gspca_dev->frbuf != NULL) {
392 rvfree(gspca_dev->frbuf,
393 gspca_dev->nframes * gspca_dev->frsz);
394 gspca_dev->frbuf = NULL;
395 for (i = 0; i < gspca_dev->nframes; i++)
396 gspca_dev->frame[i].data = NULL;
398 gspca_dev->nframes = 0;
401 static void destroy_urbs(struct gspca_dev *gspca_dev)
406 PDEBUG(D_STREAM, "kill transfer");
407 for (i = 0; i < MAX_NURBS; ++i) {
408 urb = gspca_dev->urb[i];
412 gspca_dev->urb[i] = NULL;
414 if (urb->transfer_buffer != NULL)
415 usb_buffer_free(gspca_dev->dev,
416 urb->transfer_buffer_length,
417 urb->transfer_buffer,
424 * look for an input transfer endpoint in an alternate setting
426 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
430 struct usb_host_endpoint *ep;
433 epaddr |= USB_DIR_IN;
434 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
435 ep = &alt->endpoint[i];
436 if (ep->desc.bEndpointAddress == epaddr) {
437 attr = ep->desc.bmAttributes
438 & USB_ENDPOINT_XFERTYPE_MASK;
448 * look for an input (isoc or bulk) endpoint
450 * The endpoint is defined by the subdriver.
451 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
452 * This routine may be called many times when the bandwidth is too small
453 * (the bandwidth is checked on urb submit).
455 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
457 struct usb_interface *intf;
458 struct usb_host_endpoint *ep;
461 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
463 i = gspca_dev->alt; /* previous alt setting */
466 while (--i > 0) { /* alt 0 is unusable */
467 ep = alt_xfer(&intf->altsetting[i],
468 gspca_dev->cam.epaddr,
469 USB_ENDPOINT_XFER_ISOC);
474 /* if no isoc, try bulk */
476 ep = alt_xfer(&intf->altsetting[0],
477 gspca_dev->cam.epaddr,
478 USB_ENDPOINT_XFER_BULK);
480 err("no transfer endpoint found");
484 PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
485 i, ep->desc.bEndpointAddress);
487 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
489 err("set interface err %d", ret);
493 gspca_dev->alt = i; /* memorize the current alt setting */
498 * create the URBs for image transfer
500 static int create_urbs(struct gspca_dev *gspca_dev,
501 struct usb_host_endpoint *ep)
504 int n, nurbs, i, psize, npkt, bsize;
506 /* calculate the packet size and the number of packets */
507 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
509 if (gspca_dev->alt != 0) { /* isoc */
511 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
512 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
513 npkt = ISO_MAX_SIZE / psize;
514 if (npkt > ISO_MAX_PKT)
516 bsize = psize * npkt;
518 "isoc %d pkts size %d = bsize:%d",
523 bsize = gspca_dev->cam. bulk_size;
526 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
530 gspca_dev->nurbs = nurbs;
531 for (n = 0; n < nurbs; n++) {
532 urb = usb_alloc_urb(npkt, GFP_KERNEL);
534 err("usb_alloc_urb failed");
535 destroy_urbs(gspca_dev);
538 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
543 if (urb->transfer_buffer == NULL) {
545 err("usb_buffer_urb failed");
546 destroy_urbs(gspca_dev);
549 gspca_dev->urb[n] = urb;
550 urb->dev = gspca_dev->dev;
551 urb->context = gspca_dev;
552 urb->transfer_buffer_length = bsize;
553 if (npkt != 0) { /* ISOC */
554 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
555 ep->desc.bEndpointAddress);
556 urb->transfer_flags = URB_ISO_ASAP
557 | URB_NO_TRANSFER_DMA_MAP;
558 urb->interval = ep->desc.bInterval;
559 urb->complete = isoc_irq;
560 urb->number_of_packets = npkt;
561 for (i = 0; i < npkt; i++) {
562 urb->iso_frame_desc[i].length = psize;
563 urb->iso_frame_desc[i].offset = psize * i;
566 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
567 ep->desc.bEndpointAddress),
568 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
569 urb->complete = bulk_irq;
576 * start the USB transfer
578 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
580 struct usb_host_endpoint *ep;
583 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
586 /* set the higher alternate setting and
587 * loop until urb submit succeeds */
588 gspca_dev->alt = gspca_dev->nbalt;
590 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
591 ep = get_ep(gspca_dev);
596 ret = create_urbs(gspca_dev, ep);
601 ret = gspca_dev->sd_desc->start(gspca_dev);
603 destroy_urbs(gspca_dev);
606 gspca_dev->streaming = 1;
607 atomic_set(&gspca_dev->nevent, 0);
609 /* bulk transfers are started by the subdriver */
610 if (gspca_dev->alt == 0)
613 /* submit the URBs */
614 for (n = 0; n < gspca_dev->nurbs; n++) {
615 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
617 PDEBUG(D_ERR|D_STREAM,
618 "usb_submit_urb [%d] err %d", n, ret);
619 gspca_dev->streaming = 0;
620 destroy_urbs(gspca_dev);
622 break; /* try the previous alt */
630 mutex_unlock(&gspca_dev->usb_lock);
634 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
638 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
640 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
644 /* Note: both the queue and the usb locks should be held when calling this */
645 static void gspca_stream_off(struct gspca_dev *gspca_dev)
647 gspca_dev->streaming = 0;
648 atomic_set(&gspca_dev->nevent, 0);
649 if (gspca_dev->present) {
650 if (gspca_dev->sd_desc->stopN)
651 gspca_dev->sd_desc->stopN(gspca_dev);
652 destroy_urbs(gspca_dev);
653 gspca_set_alt0(gspca_dev);
654 if (gspca_dev->sd_desc->stop0)
655 gspca_dev->sd_desc->stop0(gspca_dev);
656 PDEBUG(D_STREAM, "stream off OK");
660 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
664 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
665 gspca_dev->curr_mode = i;
666 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
667 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
668 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
671 static int wxh_to_mode(struct gspca_dev *gspca_dev,
672 int width, int height)
676 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
677 if (width >= gspca_dev->cam.cam_mode[i].width
678 && height >= gspca_dev->cam.cam_mode[i].height)
685 * search a mode with the right pixel format
687 static int gspca_get_mode(struct gspca_dev *gspca_dev,
693 modeU = modeD = mode;
694 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
696 if (gspca_dev->cam.cam_mode[modeD].pixelformat
700 if (++modeU < gspca_dev->cam.nmodes) {
701 if (gspca_dev->cam.cam_mode[modeU].pixelformat
709 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
710 struct v4l2_fmtdesc *fmtdesc)
712 struct gspca_dev *gspca_dev = priv;
716 /* give an index to each format */
719 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
720 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
723 if (fmt_tb[j] == fmt_tb[index])
728 if (fmtdesc->index == index)
729 break; /* new format */
731 if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
736 return -EINVAL; /* no more format */
738 fmtdesc->pixelformat = fmt_tb[index];
739 if (gspca_is_compressed(fmt_tb[index]))
740 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
741 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
742 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
743 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
744 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
745 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
746 fmtdesc->description[4] = '\0';
750 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
751 struct v4l2_format *fmt)
753 struct gspca_dev *gspca_dev = priv;
756 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
758 mode = gspca_dev->curr_mode;
759 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
760 sizeof fmt->fmt.pix);
764 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
765 struct v4l2_format *fmt)
767 int w, h, mode, mode2;
769 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
771 w = fmt->fmt.pix.width;
772 h = fmt->fmt.pix.height;
775 if (gspca_debug & D_CONF)
776 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
778 /* search the closest mode for width and height */
779 mode = wxh_to_mode(gspca_dev, w, h);
781 /* OK if right palette */
782 if (gspca_dev->cam.cam_mode[mode].pixelformat
783 != fmt->fmt.pix.pixelformat) {
785 /* else, search the closest mode with the same pixel format */
786 mode2 = gspca_get_mode(gspca_dev, mode,
787 fmt->fmt.pix.pixelformat);
791 ; * no chance, return this mode */
793 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
794 sizeof fmt->fmt.pix);
795 return mode; /* used when s_fmt */
798 static int vidioc_try_fmt_vid_cap(struct file *file,
800 struct v4l2_format *fmt)
802 struct gspca_dev *gspca_dev = priv;
805 ret = try_fmt_vid_cap(gspca_dev, fmt);
811 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
812 struct v4l2_format *fmt)
814 struct gspca_dev *gspca_dev = priv;
817 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
820 ret = try_fmt_vid_cap(gspca_dev, fmt);
824 if (gspca_dev->nframes != 0
825 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
830 if (ret == gspca_dev->curr_mode) {
832 goto out; /* same mode */
835 if (gspca_dev->streaming) {
839 gspca_dev->width = fmt->fmt.pix.width;
840 gspca_dev->height = fmt->fmt.pix.height;
841 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
842 gspca_dev->curr_mode = ret;
846 mutex_unlock(&gspca_dev->queue_lock);
850 static void gspca_delete(struct kref *kref)
852 struct gspca_dev *gspca_dev = container_of(kref, struct gspca_dev, kref);
854 PDEBUG(D_STREAM, "device deleted");
856 kfree(gspca_dev->usb_buf);
860 static int dev_open(struct inode *inode, struct file *file)
862 struct gspca_dev *gspca_dev;
865 PDEBUG(D_STREAM, "%s open", current->comm);
866 gspca_dev = (struct gspca_dev *) video_devdata(file);
867 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
869 if (!gspca_dev->present) {
874 if (gspca_dev->users > 4) { /* (arbitrary value) */
881 kref_get(&gspca_dev->kref);
883 file->private_data = gspca_dev;
885 /* activate the v4l2 debug */
886 if (gspca_debug & D_V4L2)
887 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
888 | V4L2_DEBUG_IOCTL_ARG;
890 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
891 | V4L2_DEBUG_IOCTL_ARG);
895 mutex_unlock(&gspca_dev->queue_lock);
897 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
899 PDEBUG(D_STREAM, "open done");
903 static int dev_close(struct inode *inode, struct file *file)
905 struct gspca_dev *gspca_dev = file->private_data;
907 PDEBUG(D_STREAM, "%s close", current->comm);
908 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
912 /* if the file did the capture, free the streaming resources */
913 if (gspca_dev->capt_file == file) {
914 if (gspca_dev->streaming) {
915 mutex_lock(&gspca_dev->usb_lock);
916 gspca_stream_off(gspca_dev);
917 mutex_unlock(&gspca_dev->usb_lock);
919 frame_free(gspca_dev);
920 gspca_dev->capt_file = NULL;
921 gspca_dev->memory = GSPCA_MEMORY_NO;
923 file->private_data = NULL;
924 mutex_unlock(&gspca_dev->queue_lock);
926 PDEBUG(D_STREAM, "close done");
928 kref_put(&gspca_dev->kref, gspca_delete);
933 static int vidioc_querycap(struct file *file, void *priv,
934 struct v4l2_capability *cap)
936 struct gspca_dev *gspca_dev = priv;
938 memset(cap, 0, sizeof *cap);
939 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
940 /* strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
941 if (gspca_dev->dev->product != NULL) {
942 strncpy(cap->card, gspca_dev->dev->product,
945 snprintf(cap->card, sizeof cap->card,
946 "USB Camera (%04x:%04x)",
947 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
948 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
950 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
951 sizeof cap->bus_info);
952 cap->version = DRIVER_VERSION_NUMBER;
953 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
955 | V4L2_CAP_READWRITE;
959 static int vidioc_queryctrl(struct file *file, void *priv,
960 struct v4l2_queryctrl *q_ctrl)
962 struct gspca_dev *gspca_dev = priv;
968 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
969 id &= V4L2_CTRL_ID_MASK;
971 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
972 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
978 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
979 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
984 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
985 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
992 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
994 if (gspca_dev->ctrl_dis & (1 << ix))
995 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
999 static int vidioc_s_ctrl(struct file *file, void *priv,
1000 struct v4l2_control *ctrl)
1002 struct gspca_dev *gspca_dev = priv;
1003 const struct ctrl *ctrls;
1006 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1007 i < gspca_dev->sd_desc->nctrls;
1009 if (ctrl->id != ctrls->qctrl.id)
1011 if (gspca_dev->ctrl_dis & (1 << i))
1013 if (ctrl->value < ctrls->qctrl.minimum
1014 || ctrl->value > ctrls->qctrl.maximum)
1016 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1017 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1018 return -ERESTARTSYS;
1019 ret = ctrls->set(gspca_dev, ctrl->value);
1020 mutex_unlock(&gspca_dev->usb_lock);
1026 static int vidioc_g_ctrl(struct file *file, void *priv,
1027 struct v4l2_control *ctrl)
1029 struct gspca_dev *gspca_dev = priv;
1031 const struct ctrl *ctrls;
1034 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1035 i < gspca_dev->sd_desc->nctrls;
1037 if (ctrl->id != ctrls->qctrl.id)
1039 if (gspca_dev->ctrl_dis & (1 << i))
1041 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1042 return -ERESTARTSYS;
1043 ret = ctrls->get(gspca_dev, &ctrl->value);
1044 mutex_unlock(&gspca_dev->usb_lock);
1050 static int vidioc_querymenu(struct file *file, void *priv,
1051 struct v4l2_querymenu *qmenu)
1053 struct gspca_dev *gspca_dev = priv;
1055 if (!gspca_dev->sd_desc->querymenu)
1057 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1060 static int vidioc_enum_input(struct file *file, void *priv,
1061 struct v4l2_input *input)
1063 struct gspca_dev *gspca_dev = priv;
1065 if (input->index != 0)
1067 memset(input, 0, sizeof *input);
1068 input->type = V4L2_INPUT_TYPE_CAMERA;
1069 strncpy(input->name, gspca_dev->sd_desc->name,
1070 sizeof input->name);
1074 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1080 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1087 static int vidioc_reqbufs(struct file *file, void *priv,
1088 struct v4l2_requestbuffers *rb)
1090 struct gspca_dev *gspca_dev = priv;
1093 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1095 switch (rb->memory) {
1096 case GSPCA_MEMORY_READ: /* (internal call) */
1097 case V4L2_MEMORY_MMAP:
1098 case V4L2_MEMORY_USERPTR:
1103 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1104 return -ERESTARTSYS;
1106 if (gspca_dev->memory != GSPCA_MEMORY_NO
1107 && gspca_dev->memory != rb->memory) {
1112 /* only one file may do the capture */
1113 if (gspca_dev->capt_file != NULL
1114 && gspca_dev->capt_file != file) {
1119 /* if allocated, the buffers must not be mapped */
1120 for (i = 0; i < gspca_dev->nframes; i++) {
1121 if (gspca_dev->frame[i].vma_use_count) {
1127 /* stop streaming */
1128 if (gspca_dev->streaming) {
1129 mutex_lock(&gspca_dev->usb_lock);
1130 gspca_stream_off(gspca_dev);
1131 mutex_unlock(&gspca_dev->usb_lock);
1134 /* free the previous allocated buffers, if any */
1135 if (gspca_dev->nframes != 0) {
1136 frame_free(gspca_dev);
1137 gspca_dev->capt_file = NULL;
1139 if (rb->count == 0) /* unrequest */
1141 gspca_dev->memory = rb->memory;
1142 ret = frame_alloc(gspca_dev, rb->count);
1144 rb->count = gspca_dev->nframes;
1145 gspca_dev->capt_file = file;
1148 mutex_unlock(&gspca_dev->queue_lock);
1149 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1153 static int vidioc_querybuf(struct file *file, void *priv,
1154 struct v4l2_buffer *v4l2_buf)
1156 struct gspca_dev *gspca_dev = priv;
1157 struct gspca_frame *frame;
1159 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1160 || v4l2_buf->index < 0
1161 || v4l2_buf->index >= gspca_dev->nframes)
1164 frame = &gspca_dev->frame[v4l2_buf->index];
1165 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1169 static int vidioc_streamon(struct file *file, void *priv,
1170 enum v4l2_buf_type buf_type)
1172 struct gspca_dev *gspca_dev = priv;
1175 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1177 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1178 return -ERESTARTSYS;
1179 if (!gspca_dev->present) {
1183 if (gspca_dev->nframes == 0) {
1187 if (!gspca_dev->streaming) {
1188 ret = gspca_init_transfer(gspca_dev);
1193 if (gspca_debug & D_STREAM) {
1194 PDEBUG_MODE("stream on OK",
1202 mutex_unlock(&gspca_dev->queue_lock);
1206 static int vidioc_streamoff(struct file *file, void *priv,
1207 enum v4l2_buf_type buf_type)
1209 struct gspca_dev *gspca_dev = priv;
1212 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1214 if (!gspca_dev->streaming)
1216 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1217 return -ERESTARTSYS;
1219 /* stop streaming */
1220 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1224 gspca_stream_off(gspca_dev);
1225 mutex_unlock(&gspca_dev->usb_lock);
1227 /* empty the application queues */
1228 for (i = 0; i < gspca_dev->nframes; i++)
1229 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1230 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1231 gspca_dev->last_packet_type = DISCARD_PACKET;
1232 gspca_dev->sequence = 0;
1233 atomic_set(&gspca_dev->nevent, 0);
1236 mutex_unlock(&gspca_dev->queue_lock);
1240 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1241 struct v4l2_jpegcompression *jpegcomp)
1243 struct gspca_dev *gspca_dev = priv;
1246 if (!gspca_dev->sd_desc->get_jcomp)
1248 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1249 return -ERESTARTSYS;
1250 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1251 mutex_unlock(&gspca_dev->usb_lock);
1255 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1256 struct v4l2_jpegcompression *jpegcomp)
1258 struct gspca_dev *gspca_dev = priv;
1261 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1262 return -ERESTARTSYS;
1263 if (!gspca_dev->sd_desc->set_jcomp)
1265 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1266 mutex_unlock(&gspca_dev->usb_lock);
1270 static int vidioc_g_parm(struct file *filp, void *priv,
1271 struct v4l2_streamparm *parm)
1273 struct gspca_dev *gspca_dev = priv;
1275 memset(parm, 0, sizeof *parm);
1276 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1277 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1281 static int vidioc_s_parm(struct file *filp, void *priv,
1282 struct v4l2_streamparm *parm)
1284 struct gspca_dev *gspca_dev = priv;
1287 n = parm->parm.capture.readbuffers;
1288 if (n == 0 || n > GSPCA_MAX_FRAMES)
1289 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1291 gspca_dev->nbufread = n;
1295 static int vidioc_s_std(struct file *filp, void *priv,
1301 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1302 static int vidiocgmbuf(struct file *file, void *priv,
1303 struct video_mbuf *mbuf)
1305 struct gspca_dev *gspca_dev = file->private_data;
1308 PDEBUG(D_STREAM, "cgmbuf");
1309 if (gspca_dev->nframes == 0) {
1313 struct v4l2_format fmt;
1315 memset(&fmt, 0, sizeof fmt);
1316 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1317 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1318 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1319 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1320 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1321 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1326 struct v4l2_requestbuffers rb;
1328 memset(&rb, 0, sizeof rb);
1330 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1331 rb.memory = V4L2_MEMORY_MMAP;
1332 ret = vidioc_reqbufs(file, priv, &rb);
1337 mbuf->frames = gspca_dev->nframes;
1338 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1339 for (i = 0; i < mbuf->frames; i++)
1340 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1345 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1347 struct gspca_dev *gspca_dev = file->private_data;
1348 struct gspca_frame *frame;
1350 unsigned long addr, start, size;
1353 start = vma->vm_start;
1354 size = vma->vm_end - vma->vm_start;
1355 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1357 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1358 return -ERESTARTSYS;
1359 if (!gspca_dev->present) {
1363 if (gspca_dev->capt_file != file) {
1369 for (i = 0; i < gspca_dev->nframes; ++i) {
1370 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1371 PDEBUG(D_STREAM, "mmap bad memory type");
1374 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1376 frame = &gspca_dev->frame[i];
1380 if (frame == NULL) {
1381 PDEBUG(D_STREAM, "mmap no frame buffer found");
1385 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1386 /* v4l1 maps all the buffers */
1388 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1390 if (size != frame->v4l2_buf.length) {
1391 PDEBUG(D_STREAM, "mmap bad size");
1397 * - VM_IO marks the area as being a mmaped region for I/O to a
1398 * device. It also prevents the region from being core dumped.
1400 vma->vm_flags |= VM_IO;
1402 addr = (unsigned long) frame->data;
1404 page = vmalloc_to_page((void *) addr);
1405 ret = vm_insert_page(vma, start, page);
1413 vma->vm_ops = &gspca_vm_ops;
1414 vma->vm_private_data = frame;
1418 mutex_unlock(&gspca_dev->queue_lock);
1423 * wait for a video frame
1425 * If a frame is ready, its index is returned.
1427 static int frame_wait(struct gspca_dev *gspca_dev,
1430 struct gspca_frame *frame;
1433 /* check if a frame is ready */
1434 i = gspca_dev->fr_o;
1435 j = gspca_dev->fr_queue[i];
1436 frame = &gspca_dev->frame[j];
1437 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1438 atomic_dec(&gspca_dev->nevent);
1441 if (nonblock_ing) /* no frame yet */
1444 /* wait till a frame is ready */
1446 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1447 atomic_read(&gspca_dev->nevent) > 0,
1448 msecs_to_jiffies(3000));
1451 return ret; /* interrupt */
1452 return -EIO; /* timeout */
1454 atomic_dec(&gspca_dev->nevent);
1455 if (!gspca_dev->streaming || !gspca_dev->present)
1457 i = gspca_dev->fr_o;
1458 j = gspca_dev->fr_queue[i];
1459 frame = &gspca_dev->frame[j];
1460 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1464 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1465 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1470 if (gspca_dev->sd_desc->dq_callback) {
1471 mutex_lock(&gspca_dev->usb_lock);
1472 gspca_dev->sd_desc->dq_callback(gspca_dev);
1473 mutex_unlock(&gspca_dev->usb_lock);
1479 * dequeue a video buffer
1481 * If nonblock_ing is false, block until a buffer is available.
1483 static int vidioc_dqbuf(struct file *file, void *priv,
1484 struct v4l2_buffer *v4l2_buf)
1486 struct gspca_dev *gspca_dev = priv;
1487 struct gspca_frame *frame;
1490 PDEBUG(D_FRAM, "dqbuf");
1491 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1493 if (v4l2_buf->memory != gspca_dev->memory)
1496 /* if not streaming, be sure the application will not loop forever */
1497 if (!(file->f_flags & O_NONBLOCK)
1498 && !gspca_dev->streaming && gspca_dev->users == 1)
1501 /* only the capturing file may dequeue */
1502 if (gspca_dev->capt_file != file)
1505 /* only one dequeue / read at a time */
1506 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1507 return -ERESTARTSYS;
1509 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1512 i = ret; /* frame index */
1513 frame = &gspca_dev->frame[i];
1514 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1515 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1517 frame->v4l2_buf.bytesused)) {
1518 PDEBUG(D_ERR|D_STREAM,
1519 "dqbuf cp to user failed");
1524 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1525 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1526 PDEBUG(D_FRAM, "dqbuf %d", i);
1529 mutex_unlock(&gspca_dev->read_lock);
1534 * queue a video buffer
1536 * Attempting to queue a buffer that has already been
1537 * queued will return -EINVAL.
1539 static int vidioc_qbuf(struct file *file, void *priv,
1540 struct v4l2_buffer *v4l2_buf)
1542 struct gspca_dev *gspca_dev = priv;
1543 struct gspca_frame *frame;
1546 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1547 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1550 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1551 return -ERESTARTSYS;
1553 index = v4l2_buf->index;
1554 if ((unsigned) index >= gspca_dev->nframes) {
1556 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1560 if (v4l2_buf->memory != gspca_dev->memory) {
1561 PDEBUG(D_FRAM, "qbuf bad memory type");
1566 frame = &gspca_dev->frame[index];
1567 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1568 PDEBUG(D_FRAM, "qbuf bad state");
1573 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1574 /* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1576 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1577 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1578 frame->v4l2_buf.length = v4l2_buf->length;
1581 /* put the buffer in the 'queued' queue */
1582 i = gspca_dev->fr_q;
1583 gspca_dev->fr_queue[i] = index;
1584 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1585 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1590 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1591 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1594 mutex_unlock(&gspca_dev->queue_lock);
1599 * allocate the resources for read()
1601 static int read_alloc(struct gspca_dev *gspca_dev,
1604 struct v4l2_buffer v4l2_buf;
1607 PDEBUG(D_STREAM, "read alloc");
1608 if (gspca_dev->nframes == 0) {
1609 struct v4l2_requestbuffers rb;
1611 memset(&rb, 0, sizeof rb);
1612 rb.count = gspca_dev->nbufread;
1613 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1614 rb.memory = GSPCA_MEMORY_READ;
1615 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1617 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1620 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1621 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1622 v4l2_buf.memory = GSPCA_MEMORY_READ;
1623 for (i = 0; i < gspca_dev->nbufread; i++) {
1625 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1627 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1631 gspca_dev->memory = GSPCA_MEMORY_READ;
1634 /* start streaming */
1635 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1637 PDEBUG(D_STREAM, "read streamon err %d", ret);
1641 static unsigned int dev_poll(struct file *file, poll_table *wait)
1643 struct gspca_dev *gspca_dev = file->private_data;
1646 PDEBUG(D_FRAM, "poll");
1648 poll_wait(file, &gspca_dev->wq, wait);
1649 if (!gspca_dev->present)
1652 /* if reqbufs is not done, the user would use read() */
1653 if (gspca_dev->nframes == 0) {
1654 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1655 return POLLERR; /* not the 1st time */
1656 ret = read_alloc(gspca_dev, file);
1661 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1663 if (!gspca_dev->present) {
1668 /* check the next incoming buffer */
1669 i = gspca_dev->fr_o;
1670 i = gspca_dev->fr_queue[i];
1671 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1672 ret = POLLIN | POLLRDNORM; /* something to read */
1676 mutex_unlock(&gspca_dev->queue_lock);
1680 static ssize_t dev_read(struct file *file, char __user *data,
1681 size_t count, loff_t *ppos)
1683 struct gspca_dev *gspca_dev = file->private_data;
1684 struct gspca_frame *frame;
1685 struct v4l2_buffer v4l2_buf;
1686 struct timeval timestamp;
1689 PDEBUG(D_FRAM, "read (%zd)", count);
1690 if (!gspca_dev->present)
1692 switch (gspca_dev->memory) {
1693 case GSPCA_MEMORY_NO: /* first time */
1694 ret = read_alloc(gspca_dev, file);
1698 case GSPCA_MEMORY_READ:
1699 if (gspca_dev->capt_file == file)
1707 jiffies_to_timeval(get_jiffies_64(), ×tamp);
1711 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1712 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1713 v4l2_buf.memory = GSPCA_MEMORY_READ;
1714 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1716 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1720 /* if the process slept for more than 1 second,
1721 * get a newer frame */
1722 frame = &gspca_dev->frame[v4l2_buf.index];
1724 break; /* avoid infinite loop */
1725 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1727 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1729 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1734 /* copy the frame */
1735 if (count > frame->v4l2_buf.bytesused)
1736 count = frame->v4l2_buf.bytesused;
1737 ret = copy_to_user(data, frame->data, count);
1739 PDEBUG(D_ERR|D_STREAM,
1740 "read cp to user lack %d / %zd", ret, count);
1746 /* in each case, requeue the buffer */
1747 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1753 static void dev_release(struct video_device *vfd)
1758 static struct file_operations dev_fops = {
1759 .owner = THIS_MODULE,
1761 .release = dev_close,
1764 .ioctl = video_ioctl2,
1765 #ifdef CONFIG_COMPAT
1766 .compat_ioctl = v4l_compat_ioctl32,
1768 .llseek = no_llseek,
1772 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1773 .vidioc_querycap = vidioc_querycap,
1774 .vidioc_dqbuf = vidioc_dqbuf,
1775 .vidioc_qbuf = vidioc_qbuf,
1776 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1777 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1778 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1779 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1780 .vidioc_streamon = vidioc_streamon,
1781 .vidioc_queryctrl = vidioc_queryctrl,
1782 .vidioc_g_ctrl = vidioc_g_ctrl,
1783 .vidioc_s_ctrl = vidioc_s_ctrl,
1784 .vidioc_querymenu = vidioc_querymenu,
1785 .vidioc_enum_input = vidioc_enum_input,
1786 .vidioc_g_input = vidioc_g_input,
1787 .vidioc_s_input = vidioc_s_input,
1788 .vidioc_reqbufs = vidioc_reqbufs,
1789 .vidioc_querybuf = vidioc_querybuf,
1790 .vidioc_streamoff = vidioc_streamoff,
1791 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1792 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1793 .vidioc_g_parm = vidioc_g_parm,
1794 .vidioc_s_parm = vidioc_s_parm,
1795 .vidioc_s_std = vidioc_s_std,
1796 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1797 .vidiocgmbuf = vidiocgmbuf,
1801 static struct video_device gspca_template = {
1802 .name = "gspca main driver",
1804 .ioctl_ops = &dev_ioctl_ops,
1805 .release = dev_release, /* mandatory */
1810 * probe and create a new gspca device
1812 * This function must be called by the sub-driver when it is
1813 * called for probing a new device.
1815 int gspca_dev_probe(struct usb_interface *intf,
1816 const struct usb_device_id *id,
1817 const struct sd_desc *sd_desc,
1819 struct module *module)
1821 struct usb_interface_descriptor *interface;
1822 struct gspca_dev *gspca_dev;
1823 struct usb_device *dev = interface_to_usbdev(intf);
1826 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1828 /* we don't handle multi-config cameras */
1829 if (dev->descriptor.bNumConfigurations != 1)
1831 interface = &intf->cur_altsetting->desc;
1832 if (interface->bInterfaceNumber > 0)
1835 /* create the device */
1836 if (dev_size < sizeof *gspca_dev)
1837 dev_size = sizeof *gspca_dev;
1838 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1839 if (gspca_dev == NULL) {
1840 err("couldn't kzalloc gspca struct");
1843 kref_init(&gspca_dev->kref);
1844 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1845 if (!gspca_dev->usb_buf) {
1846 err("out of memory");
1850 gspca_dev->dev = dev;
1851 gspca_dev->iface = interface->bInterfaceNumber;
1852 gspca_dev->nbalt = intf->num_altsetting;
1853 gspca_dev->sd_desc = sd_desc;
1854 /* gspca_dev->users = 0; (done by kzalloc) */
1855 gspca_dev->nbufread = 2;
1857 /* configure the subdriver and initialize the USB device */
1858 ret = gspca_dev->sd_desc->config(gspca_dev, id);
1861 ret = gspca_dev->sd_desc->init(gspca_dev);
1864 ret = gspca_set_alt0(gspca_dev);
1867 gspca_set_default_mode(gspca_dev);
1869 mutex_init(&gspca_dev->usb_lock);
1870 mutex_init(&gspca_dev->read_lock);
1871 mutex_init(&gspca_dev->queue_lock);
1872 init_waitqueue_head(&gspca_dev->wq);
1874 /* init video stuff */
1875 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1876 gspca_dev->vdev.parent = &dev->dev;
1877 memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1878 gspca_dev->vdev.fops = &gspca_dev->fops;
1879 gspca_dev->fops.owner = module; /* module protection */
1880 gspca_dev->present = 1;
1881 ret = video_register_device(&gspca_dev->vdev,
1885 err("video_register_device err %d", ret);
1889 usb_set_intfdata(intf, gspca_dev);
1890 PDEBUG(D_PROBE, "probe ok");
1893 kref_put(&gspca_dev->kref, gspca_delete);
1896 EXPORT_SYMBOL(gspca_dev_probe);
1901 * This function must be called by the sub-driver
1902 * when the device disconnects, after the specific resources are freed.
1904 void gspca_disconnect(struct usb_interface *intf)
1906 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1908 usb_set_intfdata(intf, NULL);
1910 gspca_dev->present = 0;
1911 mutex_lock(&gspca_dev->queue_lock);
1912 mutex_lock(&gspca_dev->usb_lock);
1913 gspca_dev->streaming = 0;
1914 destroy_urbs(gspca_dev);
1915 mutex_unlock(&gspca_dev->usb_lock);
1916 mutex_unlock(&gspca_dev->queue_lock);
1918 /* We don't want people trying to open up the device */
1919 video_unregister_device(&gspca_dev->vdev);
1921 kref_put(&gspca_dev->kref, gspca_delete);
1923 PDEBUG(D_PROBE, "disconnect complete");
1925 EXPORT_SYMBOL(gspca_disconnect);
1928 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1930 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1932 if (!gspca_dev->streaming)
1934 gspca_dev->frozen = 1; /* avoid urb error messages */
1935 if (gspca_dev->sd_desc->stopN)
1936 gspca_dev->sd_desc->stopN(gspca_dev);
1937 destroy_urbs(gspca_dev);
1938 gspca_set_alt0(gspca_dev);
1939 if (gspca_dev->sd_desc->stop0)
1940 gspca_dev->sd_desc->stop0(gspca_dev);
1943 EXPORT_SYMBOL(gspca_suspend);
1945 int gspca_resume(struct usb_interface *intf)
1947 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1949 gspca_dev->frozen = 0;
1950 gspca_dev->sd_desc->init(gspca_dev);
1951 if (gspca_dev->streaming)
1952 return gspca_init_transfer(gspca_dev);
1955 EXPORT_SYMBOL(gspca_resume);
1957 /* -- cam driver utility functions -- */
1959 /* auto gain and exposure algorithm based on the knee algorithm described here:
1960 http://ytse.tricolour.net/docs/LowLightOptimization.html
1962 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1964 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1965 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1967 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1968 const struct ctrl *gain_ctrl = NULL;
1969 const struct ctrl *exposure_ctrl = NULL;
1970 const struct ctrl *autogain_ctrl = NULL;
1973 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1974 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1975 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1976 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1977 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1978 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1979 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1981 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1982 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1983 "on cam without (auto)gain/exposure");
1987 if (gain_ctrl->get(gspca_dev, &gain) ||
1988 exposure_ctrl->get(gspca_dev, &exposure) ||
1989 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1993 orig_exposure = exposure;
1995 /* If we are of a multiple of deadzone, do multiple steps to reach the
1996 desired lumination fast (with the risc of a slight overshoot) */
1997 steps = abs(desired_avg_lum - avg_lum) / deadzone;
1999 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
2000 avg_lum, desired_avg_lum, steps);
2002 for (i = 0; i < steps; i++) {
2003 if (avg_lum > desired_avg_lum) {
2004 if (gain > gain_knee)
2006 else if (exposure > exposure_knee)
2008 else if (gain > gain_ctrl->qctrl.default_value)
2010 else if (exposure > exposure_ctrl->qctrl.minimum)
2012 else if (gain > gain_ctrl->qctrl.minimum)
2017 if (gain < gain_ctrl->qctrl.default_value)
2019 else if (exposure < exposure_knee)
2021 else if (gain < gain_knee)
2023 else if (exposure < exposure_ctrl->qctrl.maximum)
2025 else if (gain < gain_ctrl->qctrl.maximum)
2032 if (gain != orig_gain) {
2033 gain_ctrl->set(gspca_dev, gain);
2036 if (exposure != orig_exposure) {
2037 exposure_ctrl->set(gspca_dev, exposure);
2043 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2045 /* -- module insert / remove -- */
2046 static int __init gspca_init(void)
2048 info("main v%d.%d.%d registered",
2049 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2050 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2051 DRIVER_VERSION_NUMBER & 0xff);
2054 static void __exit gspca_exit(void)
2056 info("main deregistered");
2059 module_init(gspca_init);
2060 module_exit(gspca_exit);
2063 module_param_named(debug, gspca_debug, int, 0644);
2064 MODULE_PARM_DESC(debug,
2065 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2066 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"