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>
33 #include <linux/uaccess.h>
34 #include <linux/jiffies.h>
35 #include <media/v4l2-ioctl.h>
40 #define DEF_NURBS 2 /* default number of URBs */
42 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
43 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
44 MODULE_LICENSE("GPL");
46 #define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 2, 0)
48 static int video_nr = -1;
51 int gspca_debug = D_ERR | D_PROBE;
52 EXPORT_SYMBOL(gspca_debug);
54 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
56 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
57 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
61 (pixfmt >> 16) & 0xff,
65 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
72 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
76 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
77 #define GSPCA_MEMORY_READ 7
79 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
84 static void gspca_vm_open(struct vm_area_struct *vma)
86 struct gspca_frame *frame = vma->vm_private_data;
88 frame->vma_use_count++;
89 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 static void gspca_vm_close(struct vm_area_struct *vma)
94 struct gspca_frame *frame = vma->vm_private_data;
96 if (--frame->vma_use_count <= 0)
97 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 static struct vm_operations_struct gspca_vm_ops = {
101 .open = gspca_vm_open,
102 .close = gspca_vm_close,
106 * fill a video frame from an URB and resubmit
108 static void fill_frame(struct gspca_dev *gspca_dev,
111 struct gspca_frame *frame;
112 __u8 *data; /* address of data in the iso message */
116 if (urb->status != 0) {
118 if (!gspca_dev->frozen)
120 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
121 return; /* disconnection ? */
123 pkt_scan = gspca_dev->sd_desc->pkt_scan;
124 for (i = 0; i < urb->number_of_packets; i++) {
126 /* check the availability of the frame buffer */
128 j = gspca_dev->fr_queue[j];
129 frame = &gspca_dev->frame[j];
130 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
131 != V4L2_BUF_FLAG_QUEUED) {
132 gspca_dev->last_packet_type = DISCARD_PACKET;
136 /* check the packet status and length */
137 len = urb->iso_frame_desc[i].actual_length;
140 st = urb->iso_frame_desc[i].status;
143 "ISOC data error: [%d] len=%d, status=%d",
145 gspca_dev->last_packet_type = DISCARD_PACKET;
149 /* let the packet be analyzed by the subdriver */
150 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
151 i, urb->iso_frame_desc[i].offset, len);
152 data = (__u8 *) urb->transfer_buffer
153 + urb->iso_frame_desc[i].offset;
154 pkt_scan(gspca_dev, frame, data, len);
157 /* resubmit the URB */
159 st = usb_submit_urb(urb, GFP_ATOMIC);
161 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
165 * ISOC message interrupt from the USB device
167 * Analyse each packet and call the subdriver for copy to the frame buffer.
169 static void isoc_irq(struct urb *urb
172 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
174 PDEBUG(D_PACK, "isoc irq");
175 if (!gspca_dev->streaming)
177 fill_frame(gspca_dev, urb);
181 * add data to the current frame
183 * This function is called by the subdrivers at interrupt level.
185 * To build a frame, these ones must add
187 * - 0 or many INTER_PACKETs
189 * DISCARD_PACKET invalidates the whole frame.
190 * On LAST_PACKET, a new frame is returned.
192 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
194 struct gspca_frame *frame,
200 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
202 /* when start of a new frame, if the current frame buffer
203 * is not queued, discard the whole frame */
204 if (packet_type == FIRST_PACKET) {
205 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
206 != V4L2_BUF_FLAG_QUEUED) {
207 gspca_dev->last_packet_type = DISCARD_PACKET;
210 frame->data_end = frame->data;
211 jiffies_to_timeval(get_jiffies_64(),
212 &frame->v4l2_buf.timestamp);
213 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
214 } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
215 if (packet_type == LAST_PACKET)
216 gspca_dev->last_packet_type = packet_type;
220 /* append the packet to the frame buffer */
222 if (frame->data_end - frame->data + len
223 > frame->v4l2_buf.length) {
224 PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
225 frame->data_end - frame->data + len,
226 frame->v4l2_buf.length);
227 packet_type = DISCARD_PACKET;
229 memcpy(frame->data_end, data, len);
230 frame->data_end += len;
233 gspca_dev->last_packet_type = packet_type;
235 /* if last packet, wake the application and advance in the queue */
236 if (packet_type == LAST_PACKET) {
237 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
238 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
239 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
240 atomic_inc(&gspca_dev->nevent);
241 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
242 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
244 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
245 frame->v4l2_buf.bytesused,
249 j = gspca_dev->fr_queue[i];
250 frame = &gspca_dev->frame[j];
254 EXPORT_SYMBOL(gspca_frame_add);
256 static int gspca_is_compressed(__u32 format)
259 case V4L2_PIX_FMT_MJPEG:
260 case V4L2_PIX_FMT_JPEG:
261 case V4L2_PIX_FMT_SPCA561:
262 case V4L2_PIX_FMT_PAC207:
268 static void *rvmalloc(unsigned long size)
273 /* size = PAGE_ALIGN(size); (already done) */
274 mem = vmalloc_32(size);
276 adr = (unsigned long) mem;
277 while ((long) size > 0) {
278 SetPageReserved(vmalloc_to_page((void *) adr));
286 static void rvfree(void *mem, long size)
290 adr = (unsigned long) mem;
292 ClearPageReserved(vmalloc_to_page((void *) adr));
299 static int frame_alloc(struct gspca_dev *gspca_dev,
302 struct gspca_frame *frame;
306 i = gspca_dev->curr_mode;
307 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
308 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
309 frsz = PAGE_ALIGN(frsz);
310 gspca_dev->frsz = frsz;
311 if (count > GSPCA_MAX_FRAMES)
312 count = GSPCA_MAX_FRAMES;
313 gspca_dev->frbuf = rvmalloc(frsz * count);
314 if (!gspca_dev->frbuf) {
315 err("frame alloc failed");
318 gspca_dev->nframes = count;
319 for (i = 0; i < count; i++) {
320 frame = &gspca_dev->frame[i];
321 frame->v4l2_buf.index = i;
322 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
323 frame->v4l2_buf.flags = 0;
324 frame->v4l2_buf.field = V4L2_FIELD_NONE;
325 frame->v4l2_buf.length = frsz;
326 frame->v4l2_buf.memory = gspca_dev->memory;
327 frame->v4l2_buf.sequence = 0;
328 frame->data = frame->data_end =
329 gspca_dev->frbuf + i * frsz;
330 frame->v4l2_buf.m.offset = i * frsz;
332 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
333 gspca_dev->last_packet_type = DISCARD_PACKET;
334 gspca_dev->sequence = 0;
335 atomic_set(&gspca_dev->nevent, 0);
339 static void frame_free(struct gspca_dev *gspca_dev)
343 PDEBUG(D_STREAM, "frame free");
344 if (gspca_dev->frbuf != NULL) {
345 rvfree(gspca_dev->frbuf,
346 gspca_dev->nframes * gspca_dev->frsz);
347 gspca_dev->frbuf = NULL;
348 for (i = 0; i < gspca_dev->nframes; i++)
349 gspca_dev->frame[i].data = NULL;
351 gspca_dev->nframes = 0;
354 static void destroy_urbs(struct gspca_dev *gspca_dev)
359 PDEBUG(D_STREAM, "kill transfer");
360 for (i = 0; i < MAX_NURBS; ++i) {
361 urb = gspca_dev->urb[i];
365 gspca_dev->urb[i] = NULL;
367 if (urb->transfer_buffer != NULL)
368 usb_buffer_free(gspca_dev->dev,
369 urb->transfer_buffer_length,
370 urb->transfer_buffer,
377 * search an input isochronous endpoint in an alternate setting
379 static struct usb_host_endpoint *alt_isoc(struct usb_host_interface *alt,
382 struct usb_host_endpoint *ep;
385 epaddr |= USB_DIR_IN;
386 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
387 ep = &alt->endpoint[i];
388 if (ep->desc.bEndpointAddress == epaddr) {
389 attr = ep->desc.bmAttributes
390 & USB_ENDPOINT_XFERTYPE_MASK;
391 if (attr == USB_ENDPOINT_XFER_ISOC)
400 * search an input isochronous endpoint
402 * The endpoint is defined by the subdriver.
403 * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
404 * This routine may be called many times when the bandwidth is too small
405 * (the bandwidth is checked on urb submit).
407 static struct usb_host_endpoint *get_isoc_ep(struct gspca_dev *gspca_dev)
409 struct usb_interface *intf;
410 struct usb_host_endpoint *ep;
413 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
415 i = gspca_dev->alt; /* previous alt setting */
416 while (--i > 0) { /* alt 0 is unusable */
417 ep = alt_isoc(&intf->altsetting[i], gspca_dev->cam.epaddr);
422 err("no ISOC endpoint found");
425 PDEBUG(D_STREAM, "use ISOC alt %d ep 0x%02x",
426 i, ep->desc.bEndpointAddress);
427 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
429 err("set interface err %d", ret);
432 gspca_dev->alt = i; /* memorize the current alt setting */
437 * create the isochronous URBs
439 static int create_urbs(struct gspca_dev *gspca_dev,
440 struct usb_host_endpoint *ep)
443 int n, nurbs, i, psize, npkt, bsize;
445 /* calculate the packet size and the number of packets */
446 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
448 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
449 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
450 npkt = ISO_MAX_SIZE / psize;
451 if (npkt > ISO_MAX_PKT)
453 bsize = psize * npkt;
455 "isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize);
457 gspca_dev->nurbs = nurbs;
458 for (n = 0; n < nurbs; n++) {
459 urb = usb_alloc_urb(npkt, GFP_KERNEL);
461 err("usb_alloc_urb failed");
462 for (i = 0; i < n; i++)
463 usb_free_urb(gspca_dev->urb[i]);
466 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
471 if (urb->transfer_buffer == NULL) {
473 destroy_urbs(gspca_dev);
474 err("usb_buffer_urb failed");
477 gspca_dev->urb[n] = urb;
478 urb->dev = gspca_dev->dev;
479 urb->context = gspca_dev;
480 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
481 ep->desc.bEndpointAddress);
482 urb->transfer_flags = URB_ISO_ASAP
483 | URB_NO_TRANSFER_DMA_MAP;
484 urb->interval = ep->desc.bInterval;
485 urb->complete = isoc_irq;
486 urb->number_of_packets = npkt;
487 urb->transfer_buffer_length = bsize;
488 for (i = 0; i < npkt; i++) {
489 urb->iso_frame_desc[i].length = psize;
490 urb->iso_frame_desc[i].offset = psize * i;
497 * start the USB transfer
499 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
501 struct usb_host_endpoint *ep;
504 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
507 /* set the higher alternate setting and
508 * loop until urb submit succeeds */
509 gspca_dev->alt = gspca_dev->nbalt;
511 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
512 ep = get_isoc_ep(gspca_dev);
517 ret = create_urbs(gspca_dev, ep);
522 gspca_dev->sd_desc->start(gspca_dev);
523 gspca_dev->streaming = 1;
524 atomic_set(&gspca_dev->nevent, 0);
526 /* submit the URBs */
527 for (n = 0; n < gspca_dev->nurbs; n++) {
528 ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
530 PDEBUG(D_ERR|D_STREAM,
531 "usb_submit_urb [%d] err %d", n, ret);
532 gspca_dev->streaming = 0;
533 destroy_urbs(gspca_dev);
535 break; /* try the previous alt */
543 mutex_unlock(&gspca_dev->usb_lock);
547 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
551 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
553 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
557 /* Note both the queue and the usb lock should be hold when calling this */
558 static void gspca_stream_off(struct gspca_dev *gspca_dev)
560 gspca_dev->streaming = 0;
561 atomic_set(&gspca_dev->nevent, 0);
562 if (gspca_dev->present) {
563 if (gspca_dev->sd_desc->stopN)
564 gspca_dev->sd_desc->stopN(gspca_dev);
565 destroy_urbs(gspca_dev);
566 gspca_set_alt0(gspca_dev);
567 if (gspca_dev->sd_desc->stop0)
568 gspca_dev->sd_desc->stop0(gspca_dev);
569 PDEBUG(D_STREAM, "stream off OK");
573 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
577 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
578 gspca_dev->curr_mode = i;
579 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
580 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
581 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
584 static int wxh_to_mode(struct gspca_dev *gspca_dev,
585 int width, int height)
589 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
590 if (width >= gspca_dev->cam.cam_mode[i].width
591 && height >= gspca_dev->cam.cam_mode[i].height)
598 * search a mode with the right pixel format
600 static int gspca_get_mode(struct gspca_dev *gspca_dev,
606 modeU = modeD = mode;
607 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
609 if (gspca_dev->cam.cam_mode[modeD].pixelformat
613 if (++modeU < gspca_dev->cam.nmodes) {
614 if (gspca_dev->cam.cam_mode[modeU].pixelformat
622 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
623 struct v4l2_fmtdesc *fmtdesc)
625 struct gspca_dev *gspca_dev = priv;
629 /* give an index to each format */
632 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
633 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
636 if (fmt_tb[j] == fmt_tb[index])
641 if (fmtdesc->index == index)
642 break; /* new format */
644 if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
649 return -EINVAL; /* no more format */
651 fmtdesc->pixelformat = fmt_tb[index];
652 if (gspca_is_compressed(fmt_tb[index]))
653 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
654 fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
655 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
656 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
657 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
658 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
659 fmtdesc->description[4] = '\0';
663 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
664 struct v4l2_format *fmt)
666 struct gspca_dev *gspca_dev = priv;
669 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
671 mode = gspca_dev->curr_mode;
672 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
673 sizeof fmt->fmt.pix);
677 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
678 struct v4l2_format *fmt)
680 int w, h, mode, mode2;
682 if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
684 w = fmt->fmt.pix.width;
685 h = fmt->fmt.pix.height;
688 if (gspca_debug & D_CONF)
689 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
691 /* search the closest mode for width and height */
692 mode = wxh_to_mode(gspca_dev, w, h);
694 /* OK if right palette */
695 if (gspca_dev->cam.cam_mode[mode].pixelformat
696 != fmt->fmt.pix.pixelformat) {
698 /* else, search the closest mode with the same pixel format */
699 mode2 = gspca_get_mode(gspca_dev, mode,
700 fmt->fmt.pix.pixelformat);
704 ; * no chance, return this mode */
706 memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
707 sizeof fmt->fmt.pix);
708 return mode; /* used when s_fmt */
711 static int vidioc_try_fmt_vid_cap(struct file *file,
713 struct v4l2_format *fmt)
715 struct gspca_dev *gspca_dev = priv;
718 ret = try_fmt_vid_cap(gspca_dev, fmt);
724 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
725 struct v4l2_format *fmt)
727 struct gspca_dev *gspca_dev = priv;
730 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
733 ret = try_fmt_vid_cap(gspca_dev, fmt);
737 if (gspca_dev->nframes != 0
738 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
743 if (ret == gspca_dev->curr_mode) {
745 goto out; /* same mode */
748 if (gspca_dev->streaming) {
752 gspca_dev->width = fmt->fmt.pix.width;
753 gspca_dev->height = fmt->fmt.pix.height;
754 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
755 gspca_dev->curr_mode = ret;
759 mutex_unlock(&gspca_dev->queue_lock);
763 static int dev_open(struct inode *inode, struct file *file)
765 struct gspca_dev *gspca_dev;
768 PDEBUG(D_STREAM, "%s open", current->comm);
769 gspca_dev = (struct gspca_dev *) video_devdata(file);
770 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
772 if (!gspca_dev->present) {
777 if (gspca_dev->users > 4) { /* (arbitrary value) */
782 file->private_data = gspca_dev;
784 /* activate the v4l2 debug */
785 if (gspca_debug & D_V4L2)
786 gspca_dev->vdev.debug |= 3;
788 gspca_dev->vdev.debug &= ~3;
792 mutex_unlock(&gspca_dev->queue_lock);
794 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
796 PDEBUG(D_STREAM, "open done");
800 static int dev_close(struct inode *inode, struct file *file)
802 struct gspca_dev *gspca_dev = file->private_data;
804 PDEBUG(D_STREAM, "%s close", current->comm);
805 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
809 /* if the file did the capture, free the streaming resources */
810 if (gspca_dev->capt_file == file) {
811 if (gspca_dev->streaming) {
812 mutex_lock(&gspca_dev->usb_lock);
813 gspca_stream_off(gspca_dev);
814 mutex_unlock(&gspca_dev->usb_lock);
816 frame_free(gspca_dev);
817 gspca_dev->capt_file = NULL;
818 gspca_dev->memory = GSPCA_MEMORY_NO;
820 file->private_data = NULL;
821 mutex_unlock(&gspca_dev->queue_lock);
822 PDEBUG(D_STREAM, "close done");
826 static int vidioc_querycap(struct file *file, void *priv,
827 struct v4l2_capability *cap)
829 struct gspca_dev *gspca_dev = priv;
831 memset(cap, 0, sizeof *cap);
832 strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
833 /* strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); */
834 if (gspca_dev->dev->product != NULL) {
835 strncpy(cap->card, gspca_dev->dev->product,
838 snprintf(cap->card, sizeof cap->card,
839 "USB Camera (%04x:%04x)",
840 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
841 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
843 strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
844 sizeof cap->bus_info);
845 cap->version = DRIVER_VERSION_NUMBER;
846 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
848 | V4L2_CAP_READWRITE;
852 static int vidioc_queryctrl(struct file *file, void *priv,
853 struct v4l2_queryctrl *q_ctrl)
855 struct gspca_dev *gspca_dev = priv;
861 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
862 id &= V4L2_CTRL_ID_MASK;
864 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
865 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
871 if (gspca_dev->sd_desc->ctrls[i].qctrl.id
872 > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
877 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
878 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
885 memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
887 if (gspca_dev->ctrl_dis & (1 << ix))
888 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
892 static int vidioc_s_ctrl(struct file *file, void *priv,
893 struct v4l2_control *ctrl)
895 struct gspca_dev *gspca_dev = priv;
896 const struct ctrl *ctrls;
899 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
900 i < gspca_dev->sd_desc->nctrls;
902 if (ctrl->id != ctrls->qctrl.id)
904 if (gspca_dev->ctrl_dis & (1 << i))
906 if (ctrl->value < ctrls->qctrl.minimum
907 || ctrl->value > ctrls->qctrl.maximum)
909 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
910 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
912 ret = ctrls->set(gspca_dev, ctrl->value);
913 mutex_unlock(&gspca_dev->usb_lock);
919 static int vidioc_g_ctrl(struct file *file, void *priv,
920 struct v4l2_control *ctrl)
922 struct gspca_dev *gspca_dev = priv;
924 const struct ctrl *ctrls;
927 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
928 i < gspca_dev->sd_desc->nctrls;
930 if (ctrl->id != ctrls->qctrl.id)
932 if (gspca_dev->ctrl_dis & (1 << i))
934 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
936 ret = ctrls->get(gspca_dev, &ctrl->value);
937 mutex_unlock(&gspca_dev->usb_lock);
943 static int vidioc_querymenu(struct file *file, void *priv,
944 struct v4l2_querymenu *qmenu)
946 struct gspca_dev *gspca_dev = priv;
948 if (!gspca_dev->sd_desc->querymenu)
950 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
953 static int vidioc_enum_input(struct file *file, void *priv,
954 struct v4l2_input *input)
956 struct gspca_dev *gspca_dev = priv;
958 if (input->index != 0)
960 memset(input, 0, sizeof *input);
961 input->type = V4L2_INPUT_TYPE_CAMERA;
962 strncpy(input->name, gspca_dev->sd_desc->name,
967 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
973 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
980 static int vidioc_reqbufs(struct file *file, void *priv,
981 struct v4l2_requestbuffers *rb)
983 struct gspca_dev *gspca_dev = priv;
986 if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
988 switch (rb->memory) {
989 case GSPCA_MEMORY_READ: /* (internal call) */
990 case V4L2_MEMORY_MMAP:
991 case V4L2_MEMORY_USERPTR:
996 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
999 if (gspca_dev->memory != GSPCA_MEMORY_NO
1000 && gspca_dev->memory != rb->memory) {
1005 /* only one file may do the capture */
1006 if (gspca_dev->capt_file != NULL
1007 && gspca_dev->capt_file != file) {
1012 /* if allocated, the buffers must not be mapped */
1013 for (i = 0; i < gspca_dev->nframes; i++) {
1014 if (gspca_dev->frame[i].vma_use_count) {
1020 /* stop streaming */
1021 if (gspca_dev->streaming) {
1022 mutex_lock(&gspca_dev->usb_lock);
1023 gspca_stream_off(gspca_dev);
1024 mutex_unlock(&gspca_dev->usb_lock);
1027 /* free the previous allocated buffers, if any */
1028 if (gspca_dev->nframes != 0) {
1029 frame_free(gspca_dev);
1030 gspca_dev->capt_file = NULL;
1032 if (rb->count == 0) /* unrequest */
1034 gspca_dev->memory = rb->memory;
1035 ret = frame_alloc(gspca_dev, rb->count);
1037 rb->count = gspca_dev->nframes;
1038 gspca_dev->capt_file = file;
1041 mutex_unlock(&gspca_dev->queue_lock);
1042 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1046 static int vidioc_querybuf(struct file *file, void *priv,
1047 struct v4l2_buffer *v4l2_buf)
1049 struct gspca_dev *gspca_dev = priv;
1050 struct gspca_frame *frame;
1052 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1053 || v4l2_buf->index < 0
1054 || v4l2_buf->index >= gspca_dev->nframes)
1057 frame = &gspca_dev->frame[v4l2_buf->index];
1058 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1062 static int vidioc_streamon(struct file *file, void *priv,
1063 enum v4l2_buf_type buf_type)
1065 struct gspca_dev *gspca_dev = priv;
1068 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1070 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1071 return -ERESTARTSYS;
1072 if (!gspca_dev->present) {
1076 if (gspca_dev->nframes == 0) {
1080 if (!gspca_dev->streaming) {
1081 ret = gspca_init_transfer(gspca_dev);
1086 if (gspca_debug & D_STREAM) {
1087 PDEBUG_MODE("stream on OK",
1095 mutex_unlock(&gspca_dev->queue_lock);
1099 static int vidioc_streamoff(struct file *file, void *priv,
1100 enum v4l2_buf_type buf_type)
1102 struct gspca_dev *gspca_dev = priv;
1105 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1107 if (!gspca_dev->streaming)
1109 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1110 return -ERESTARTSYS;
1112 /* stop streaming */
1113 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1117 gspca_stream_off(gspca_dev);
1118 mutex_unlock(&gspca_dev->usb_lock);
1120 /* empty the application queues */
1121 for (i = 0; i < gspca_dev->nframes; i++)
1122 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1123 gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1124 gspca_dev->last_packet_type = DISCARD_PACKET;
1125 gspca_dev->sequence = 0;
1126 atomic_set(&gspca_dev->nevent, 0);
1129 mutex_unlock(&gspca_dev->queue_lock);
1133 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1134 struct v4l2_jpegcompression *jpegcomp)
1136 struct gspca_dev *gspca_dev = priv;
1139 if (!gspca_dev->sd_desc->get_jcomp)
1141 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1142 return -ERESTARTSYS;
1143 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1144 mutex_unlock(&gspca_dev->usb_lock);
1148 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1149 struct v4l2_jpegcompression *jpegcomp)
1151 struct gspca_dev *gspca_dev = priv;
1154 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1155 return -ERESTARTSYS;
1156 if (!gspca_dev->sd_desc->set_jcomp)
1158 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1159 mutex_unlock(&gspca_dev->usb_lock);
1163 static int vidioc_g_parm(struct file *filp, void *priv,
1164 struct v4l2_streamparm *parm)
1166 struct gspca_dev *gspca_dev = priv;
1168 memset(parm, 0, sizeof *parm);
1169 parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1170 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1174 static int vidioc_s_parm(struct file *filp, void *priv,
1175 struct v4l2_streamparm *parm)
1177 struct gspca_dev *gspca_dev = priv;
1180 n = parm->parm.capture.readbuffers;
1181 if (n == 0 || n > GSPCA_MAX_FRAMES)
1182 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1184 gspca_dev->nbufread = n;
1188 static int vidioc_s_std(struct file *filp, void *priv,
1194 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1195 static int vidiocgmbuf(struct file *file, void *priv,
1196 struct video_mbuf *mbuf)
1198 struct gspca_dev *gspca_dev = file->private_data;
1201 PDEBUG(D_STREAM, "cgmbuf");
1202 if (gspca_dev->nframes == 0) {
1206 struct v4l2_format fmt;
1208 memset(&fmt, 0, sizeof fmt);
1209 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1210 i = gspca_dev->cam.nmodes - 1; /* highest mode */
1211 fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1212 fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1213 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1214 ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1219 struct v4l2_requestbuffers rb;
1221 memset(&rb, 0, sizeof rb);
1223 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1224 rb.memory = V4L2_MEMORY_MMAP;
1225 ret = vidioc_reqbufs(file, priv, &rb);
1230 mbuf->frames = gspca_dev->nframes;
1231 mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1232 for (i = 0; i < mbuf->frames; i++)
1233 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1238 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1240 struct gspca_dev *gspca_dev = file->private_data;
1241 struct gspca_frame *frame;
1243 unsigned long addr, start, size;
1246 start = vma->vm_start;
1247 size = vma->vm_end - vma->vm_start;
1248 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1250 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1251 return -ERESTARTSYS;
1252 if (!gspca_dev->present) {
1256 if (gspca_dev->capt_file != file) {
1262 for (i = 0; i < gspca_dev->nframes; ++i) {
1263 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1264 PDEBUG(D_STREAM, "mmap bad memory type");
1267 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1269 frame = &gspca_dev->frame[i];
1273 if (frame == NULL) {
1274 PDEBUG(D_STREAM, "mmap no frame buffer found");
1278 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1279 /* v4l1 maps all the buffers */
1281 || size != frame->v4l2_buf.length * gspca_dev->nframes)
1283 if (size != frame->v4l2_buf.length) {
1284 PDEBUG(D_STREAM, "mmap bad size");
1290 * - VM_IO marks the area as being a mmaped region for I/O to a
1291 * device. It also prevents the region from being core dumped.
1293 vma->vm_flags |= VM_IO;
1295 addr = (unsigned long) frame->data;
1297 page = vmalloc_to_page((void *) addr);
1298 ret = vm_insert_page(vma, start, page);
1306 vma->vm_ops = &gspca_vm_ops;
1307 vma->vm_private_data = frame;
1311 mutex_unlock(&gspca_dev->queue_lock);
1316 * wait for a video frame
1318 * If a frame is ready, its index is returned.
1320 static int frame_wait(struct gspca_dev *gspca_dev,
1323 struct gspca_frame *frame;
1326 /* check if a frame is ready */
1327 i = gspca_dev->fr_o;
1328 j = gspca_dev->fr_queue[i];
1329 frame = &gspca_dev->frame[j];
1330 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1331 atomic_dec(&gspca_dev->nevent);
1334 if (nonblock_ing) /* no frame yet */
1337 /* wait till a frame is ready */
1339 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1340 atomic_read(&gspca_dev->nevent) > 0,
1341 msecs_to_jiffies(3000));
1344 return ret; /* interrupt */
1345 return -EIO; /* timeout */
1347 atomic_dec(&gspca_dev->nevent);
1348 if (!gspca_dev->streaming || !gspca_dev->present)
1350 i = gspca_dev->fr_o;
1351 j = gspca_dev->fr_queue[i];
1352 frame = &gspca_dev->frame[j];
1353 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1357 gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1358 PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1363 if (gspca_dev->sd_desc->dq_callback) {
1364 mutex_lock(&gspca_dev->usb_lock);
1365 gspca_dev->sd_desc->dq_callback(gspca_dev);
1366 mutex_unlock(&gspca_dev->usb_lock);
1372 * dequeue a video buffer
1374 * If nonblock_ing is false, block until a buffer is available.
1376 static int vidioc_dqbuf(struct file *file, void *priv,
1377 struct v4l2_buffer *v4l2_buf)
1379 struct gspca_dev *gspca_dev = priv;
1380 struct gspca_frame *frame;
1383 PDEBUG(D_FRAM, "dqbuf");
1384 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1386 if (v4l2_buf->memory != gspca_dev->memory)
1389 /* if not streaming, be sure the application will not loop forever */
1390 if (!(file->f_flags & O_NONBLOCK)
1391 && !gspca_dev->streaming && gspca_dev->users == 1)
1394 /* only the capturing file may dequeue */
1395 if (gspca_dev->capt_file != file)
1398 /* only one dequeue / read at a time */
1399 if (mutex_lock_interruptible(&gspca_dev->read_lock))
1400 return -ERESTARTSYS;
1402 ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1405 i = ret; /* frame index */
1406 frame = &gspca_dev->frame[i];
1407 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1408 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1410 frame->v4l2_buf.bytesused)) {
1411 PDEBUG(D_ERR|D_STREAM,
1412 "dqbuf cp to user failed");
1417 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1418 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1419 PDEBUG(D_FRAM, "dqbuf %d", i);
1422 mutex_unlock(&gspca_dev->read_lock);
1427 * queue a video buffer
1429 * Attempting to queue a buffer that has already been
1430 * queued will return -EINVAL.
1432 static int vidioc_qbuf(struct file *file, void *priv,
1433 struct v4l2_buffer *v4l2_buf)
1435 struct gspca_dev *gspca_dev = priv;
1436 struct gspca_frame *frame;
1439 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1440 if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1443 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1444 return -ERESTARTSYS;
1446 index = v4l2_buf->index;
1447 if ((unsigned) index >= gspca_dev->nframes) {
1449 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1453 if (v4l2_buf->memory != gspca_dev->memory) {
1454 PDEBUG(D_FRAM, "qbuf bad memory type");
1459 frame = &gspca_dev->frame[index];
1460 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1461 PDEBUG(D_FRAM, "qbuf bad state");
1466 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1467 /* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1469 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1470 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1471 frame->v4l2_buf.length = v4l2_buf->length;
1474 /* put the buffer in the 'queued' queue */
1475 i = gspca_dev->fr_q;
1476 gspca_dev->fr_queue[i] = index;
1477 gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1478 PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1483 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1484 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1487 mutex_unlock(&gspca_dev->queue_lock);
1492 * allocate the resources for read()
1494 static int read_alloc(struct gspca_dev *gspca_dev,
1497 struct v4l2_buffer v4l2_buf;
1500 PDEBUG(D_STREAM, "read alloc");
1501 if (gspca_dev->nframes == 0) {
1502 struct v4l2_requestbuffers rb;
1504 memset(&rb, 0, sizeof rb);
1505 rb.count = gspca_dev->nbufread;
1506 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1507 rb.memory = GSPCA_MEMORY_READ;
1508 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1510 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1513 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1514 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1515 v4l2_buf.memory = GSPCA_MEMORY_READ;
1516 for (i = 0; i < gspca_dev->nbufread; i++) {
1518 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1520 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1524 gspca_dev->memory = GSPCA_MEMORY_READ;
1527 /* start streaming */
1528 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1530 PDEBUG(D_STREAM, "read streamon err %d", ret);
1534 static unsigned int dev_poll(struct file *file, poll_table *wait)
1536 struct gspca_dev *gspca_dev = file->private_data;
1539 PDEBUG(D_FRAM, "poll");
1541 poll_wait(file, &gspca_dev->wq, wait);
1542 if (!gspca_dev->present)
1545 /* if reqbufs is not done, the user would use read() */
1546 if (gspca_dev->nframes == 0) {
1547 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1548 return POLLERR; /* not the 1st time */
1549 ret = read_alloc(gspca_dev, file);
1554 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1556 if (!gspca_dev->present) {
1561 /* check the next incoming buffer */
1562 i = gspca_dev->fr_o;
1563 i = gspca_dev->fr_queue[i];
1564 if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1565 ret = POLLIN | POLLRDNORM; /* something to read */
1569 mutex_unlock(&gspca_dev->queue_lock);
1573 static ssize_t dev_read(struct file *file, char __user *data,
1574 size_t count, loff_t *ppos)
1576 struct gspca_dev *gspca_dev = file->private_data;
1577 struct gspca_frame *frame;
1578 struct v4l2_buffer v4l2_buf;
1579 struct timeval timestamp;
1582 PDEBUG(D_FRAM, "read (%zd)", count);
1583 if (!gspca_dev->present)
1585 switch (gspca_dev->memory) {
1586 case GSPCA_MEMORY_NO: /* first time */
1587 ret = read_alloc(gspca_dev, file);
1591 case GSPCA_MEMORY_READ:
1592 if (gspca_dev->capt_file == file)
1600 jiffies_to_timeval(get_jiffies_64(), ×tamp);
1604 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1605 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1606 v4l2_buf.memory = GSPCA_MEMORY_READ;
1607 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1609 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1613 /* if the process slept for more than 1 second,
1614 * get anewer frame */
1615 frame = &gspca_dev->frame[v4l2_buf.index];
1617 break; /* avoid infinite loop */
1618 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1620 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1622 PDEBUG(D_STREAM, "read qbuf err %d", ret);
1627 /* copy the frame */
1628 if (count > frame->v4l2_buf.bytesused)
1629 count = frame->v4l2_buf.bytesused;
1630 ret = copy_to_user(data, frame->data, count);
1632 PDEBUG(D_ERR|D_STREAM,
1633 "read cp to user lack %d / %zd", ret, count);
1639 /* in each case, requeue the buffer */
1640 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1646 static void dev_release(struct video_device *vfd)
1651 static struct file_operations dev_fops = {
1652 .owner = THIS_MODULE,
1654 .release = dev_close,
1657 .ioctl = video_ioctl2,
1658 #ifdef CONFIG_COMPAT
1659 .compat_ioctl = v4l_compat_ioctl32,
1661 .llseek = no_llseek,
1665 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1666 .vidioc_querycap = vidioc_querycap,
1667 .vidioc_dqbuf = vidioc_dqbuf,
1668 .vidioc_qbuf = vidioc_qbuf,
1669 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1670 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1671 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1672 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1673 .vidioc_streamon = vidioc_streamon,
1674 .vidioc_queryctrl = vidioc_queryctrl,
1675 .vidioc_g_ctrl = vidioc_g_ctrl,
1676 .vidioc_s_ctrl = vidioc_s_ctrl,
1677 .vidioc_querymenu = vidioc_querymenu,
1678 .vidioc_enum_input = vidioc_enum_input,
1679 .vidioc_g_input = vidioc_g_input,
1680 .vidioc_s_input = vidioc_s_input,
1681 .vidioc_reqbufs = vidioc_reqbufs,
1682 .vidioc_querybuf = vidioc_querybuf,
1683 .vidioc_streamoff = vidioc_streamoff,
1684 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
1685 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
1686 .vidioc_g_parm = vidioc_g_parm,
1687 .vidioc_s_parm = vidioc_s_parm,
1688 .vidioc_s_std = vidioc_s_std,
1689 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1690 .vidiocgmbuf = vidiocgmbuf,
1694 static struct video_device gspca_template = {
1695 .name = "gspca main driver",
1697 .ioctl_ops = &dev_ioctl_ops,
1698 .release = dev_release, /* mandatory */
1703 * probe and create a new gspca device
1705 * This function must be called by the sub-driver when it is
1706 * called for probing a new device.
1708 int gspca_dev_probe(struct usb_interface *intf,
1709 const struct usb_device_id *id,
1710 const struct sd_desc *sd_desc,
1712 struct module *module)
1714 struct usb_interface_descriptor *interface;
1715 struct gspca_dev *gspca_dev;
1716 struct usb_device *dev = interface_to_usbdev(intf);
1719 PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1721 /* we don't handle multi-config cameras */
1722 if (dev->descriptor.bNumConfigurations != 1)
1724 interface = &intf->cur_altsetting->desc;
1725 if (interface->bInterfaceNumber > 0)
1728 /* create the device */
1729 if (dev_size < sizeof *gspca_dev)
1730 dev_size = sizeof *gspca_dev;
1731 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1732 if (gspca_dev == NULL) {
1733 err("couldn't kzalloc gspca struct");
1736 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1737 if (!gspca_dev->usb_buf) {
1738 err("out of memory");
1742 gspca_dev->dev = dev;
1743 gspca_dev->iface = interface->bInterfaceNumber;
1744 gspca_dev->nbalt = intf->num_altsetting;
1745 gspca_dev->sd_desc = sd_desc;
1746 /* gspca_dev->users = 0; (done by kzalloc) */
1747 gspca_dev->nbufread = 2;
1749 /* configure the subdriver and initialize the USB device */
1750 ret = gspca_dev->sd_desc->config(gspca_dev, id);
1753 ret = gspca_dev->sd_desc->init(gspca_dev);
1756 ret = gspca_set_alt0(gspca_dev);
1759 gspca_set_default_mode(gspca_dev);
1761 mutex_init(&gspca_dev->usb_lock);
1762 mutex_init(&gspca_dev->read_lock);
1763 mutex_init(&gspca_dev->queue_lock);
1764 init_waitqueue_head(&gspca_dev->wq);
1766 /* init video stuff */
1767 memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1768 gspca_dev->vdev.parent = &dev->dev;
1769 memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1770 gspca_dev->vdev.fops = &gspca_dev->fops;
1771 gspca_dev->fops.owner = module; /* module protection */
1772 gspca_dev->present = 1;
1773 ret = video_register_device(&gspca_dev->vdev,
1777 err("video_register_device err %d", ret);
1781 usb_set_intfdata(intf, gspca_dev);
1782 PDEBUG(D_PROBE, "probe ok");
1785 kfree(gspca_dev->usb_buf);
1789 EXPORT_SYMBOL(gspca_dev_probe);
1794 * This function must be called by the sub-driver
1795 * when the device disconnects, after the specific resources are freed.
1797 void gspca_disconnect(struct usb_interface *intf)
1799 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1803 gspca_dev->present = 0;
1804 mutex_lock(&gspca_dev->queue_lock);
1805 mutex_lock(&gspca_dev->usb_lock);
1806 gspca_dev->streaming = 0;
1807 destroy_urbs(gspca_dev);
1808 mutex_unlock(&gspca_dev->usb_lock);
1809 mutex_unlock(&gspca_dev->queue_lock);
1810 while (gspca_dev->users != 0) { /* wait until fully closed */
1811 atomic_inc(&gspca_dev->nevent);
1812 wake_up_interruptible(&gspca_dev->wq); /* wake processes */
1815 /* We don't want people trying to open up the device */
1816 video_unregister_device(&gspca_dev->vdev);
1817 /* Free the memory */
1818 kfree(gspca_dev->usb_buf);
1820 PDEBUG(D_PROBE, "disconnect complete");
1822 EXPORT_SYMBOL(gspca_disconnect);
1825 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1827 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1829 if (!gspca_dev->streaming)
1831 gspca_dev->frozen = 1; /* avoid urb error messages */
1832 if (gspca_dev->sd_desc->stopN)
1833 gspca_dev->sd_desc->stopN(gspca_dev);
1834 destroy_urbs(gspca_dev);
1835 gspca_set_alt0(gspca_dev);
1836 if (gspca_dev->sd_desc->stop0)
1837 gspca_dev->sd_desc->stop0(gspca_dev);
1840 EXPORT_SYMBOL(gspca_suspend);
1842 int gspca_resume(struct usb_interface *intf)
1844 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1846 gspca_dev->frozen = 0;
1847 gspca_dev->sd_desc->init(gspca_dev);
1848 if (gspca_dev->streaming)
1849 return gspca_init_transfer(gspca_dev);
1852 EXPORT_SYMBOL(gspca_resume);
1854 /* -- cam driver utility functions -- */
1856 /* auto gain and exposure algorithm based on the knee algorithm described here:
1857 http://ytse.tricolour.net/docs/LowLightOptimization.html
1859 Returns 0 if no changes were made, 1 if the gain and or exposure settings
1861 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
1862 int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
1864 int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
1865 const struct ctrl *gain_ctrl = NULL;
1866 const struct ctrl *exposure_ctrl = NULL;
1867 const struct ctrl *autogain_ctrl = NULL;
1870 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1871 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
1872 gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1873 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
1874 exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
1875 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
1876 autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
1878 if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
1879 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
1880 "on cam without (auto)gain/exposure");
1884 if (gain_ctrl->get(gspca_dev, &gain) ||
1885 exposure_ctrl->get(gspca_dev, &exposure) ||
1886 autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
1890 orig_exposure = exposure;
1892 /* If we are of a multiple of deadzone, do multiple steps to reach the
1893 desired lumination fast (with the risc of a slight overshoot) */
1894 steps = abs(desired_avg_lum - avg_lum) / deadzone;
1896 PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n",
1897 avg_lum, desired_avg_lum, steps);
1899 for (i = 0; i < steps; i++) {
1900 if (avg_lum > desired_avg_lum) {
1901 if (gain > gain_knee)
1903 else if (exposure > exposure_knee)
1905 else if (gain > gain_ctrl->qctrl.default_value)
1907 else if (exposure > exposure_ctrl->qctrl.minimum)
1909 else if (gain > gain_ctrl->qctrl.minimum)
1914 if (gain < gain_ctrl->qctrl.default_value)
1916 else if (exposure < exposure_knee)
1918 else if (gain < gain_knee)
1920 else if (exposure < exposure_ctrl->qctrl.maximum)
1922 else if (gain < gain_ctrl->qctrl.maximum)
1929 if (gain != orig_gain) {
1930 gain_ctrl->set(gspca_dev, gain);
1933 if (exposure != orig_exposure) {
1934 exposure_ctrl->set(gspca_dev, exposure);
1940 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
1942 /* -- module insert / remove -- */
1943 static int __init gspca_init(void)
1945 info("main v%d.%d.%d registered",
1946 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
1947 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
1948 DRIVER_VERSION_NUMBER & 0xff);
1951 static void __exit gspca_exit(void)
1953 info("main deregistered");
1956 module_init(gspca_init);
1957 module_exit(gspca_exit);
1960 module_param_named(debug, gspca_debug, int, 0644);
1961 MODULE_PARM_DESC(debug,
1962 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
1963 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"