2 * Main USB camera driver
4 * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
6 * Camera button input handling by Márton Németh
7 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
26 #define GSPCA_VERSION "2.14.0"
28 #include <linux/init.h>
30 #include <linux/vmalloc.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
34 #include <linux/string.h>
35 #include <linux/pagemap.h>
38 #include <linux/uaccess.h>
39 #include <linux/ktime.h>
40 #include <media/v4l2-ioctl.h>
41 #include <media/v4l2-ctrls.h>
42 #include <media/v4l2-fh.h>
43 #include <media/v4l2-event.h>
47 #if IS_ENABLED(CONFIG_INPUT)
48 #include <linux/input.h>
49 #include <linux/usb/input.h>
53 #define DEF_NURBS 3 /* default number of URBs */
54 #if DEF_NURBS > MAX_NURBS
55 #error "DEF_NURBS too big"
58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
59 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
60 MODULE_LICENSE("GPL");
61 MODULE_VERSION(GSPCA_VERSION);
64 int gspca_debug = D_ERR | D_PROBE;
65 EXPORT_SYMBOL(gspca_debug);
67 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
69 if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
70 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
74 (pixfmt >> 16) & 0xff,
78 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
85 #define PDEBUG_MODE(txt, pixfmt, w, h)
88 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
89 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
90 #define GSPCA_MEMORY_READ 7
92 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
97 static void gspca_vm_open(struct vm_area_struct *vma)
99 struct gspca_frame *frame = vma->vm_private_data;
101 frame->vma_use_count++;
102 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
105 static void gspca_vm_close(struct vm_area_struct *vma)
107 struct gspca_frame *frame = vma->vm_private_data;
109 if (--frame->vma_use_count <= 0)
110 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
113 static const struct vm_operations_struct gspca_vm_ops = {
114 .open = gspca_vm_open,
115 .close = gspca_vm_close,
119 * Input and interrupt endpoint handling functions
121 #if IS_ENABLED(CONFIG_INPUT)
122 static void int_irq(struct urb *urb)
124 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
130 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
131 urb->transfer_buffer, urb->actual_length) < 0) {
132 PDEBUG(D_ERR, "Unknown packet received");
140 /* Stop is requested either by software or hardware is gone,
141 * keep the ret value non-zero and don't resubmit later.
146 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
152 ret = usb_submit_urb(urb, GFP_ATOMIC);
154 pr_err("Resubmit URB failed with error %i\n", ret);
158 static int gspca_input_connect(struct gspca_dev *dev)
160 struct input_dev *input_dev;
163 dev->input_dev = NULL;
164 if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input) {
165 input_dev = input_allocate_device();
169 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
170 strlcat(dev->phys, "/input0", sizeof(dev->phys));
172 input_dev->name = dev->sd_desc->name;
173 input_dev->phys = dev->phys;
175 usb_to_input_id(dev->dev, &input_dev->id);
177 input_dev->evbit[0] = BIT_MASK(EV_KEY);
178 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
179 input_dev->dev.parent = &dev->dev->dev;
181 err = input_register_device(input_dev);
183 pr_err("Input device registration failed with error %i\n",
185 input_dev->dev.parent = NULL;
186 input_free_device(input_dev);
188 dev->input_dev = input_dev;
195 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
196 struct usb_endpoint_descriptor *ep)
198 unsigned int buffer_len;
201 struct usb_device *dev;
205 buffer_len = le16_to_cpu(ep->wMaxPacketSize);
206 interval = ep->bInterval;
207 PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
208 "buffer_len=%u, interval=%u",
209 ep->bEndpointAddress, buffer_len, interval);
211 dev = gspca_dev->dev;
213 urb = usb_alloc_urb(0, GFP_KERNEL);
219 buffer = usb_alloc_coherent(dev, buffer_len,
220 GFP_KERNEL, &urb->transfer_dma);
225 usb_fill_int_urb(urb, dev,
226 usb_rcvintpipe(dev, ep->bEndpointAddress),
228 int_irq, (void *)gspca_dev, interval);
229 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
230 ret = usb_submit_urb(urb, GFP_KERNEL);
232 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
235 gspca_dev->int_urb = urb;
239 usb_free_coherent(dev,
240 urb->transfer_buffer_length,
241 urb->transfer_buffer,
249 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
251 struct usb_interface *intf;
252 struct usb_host_interface *intf_desc;
253 struct usb_endpoint_descriptor *ep;
256 if (gspca_dev->sd_desc->int_pkt_scan) {
257 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
258 intf_desc = intf->cur_altsetting;
259 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
260 ep = &intf_desc->endpoint[i].desc;
261 if (usb_endpoint_dir_in(ep) &&
262 usb_endpoint_xfer_int(ep)) {
264 alloc_and_submit_int_urb(gspca_dev, ep);
271 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
275 urb = gspca_dev->int_urb;
277 gspca_dev->int_urb = NULL;
279 usb_free_coherent(gspca_dev->dev,
280 urb->transfer_buffer_length,
281 urb->transfer_buffer,
287 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
291 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
295 static inline int gspca_input_connect(struct gspca_dev *dev)
302 * fill a video frame from an URB and resubmit
304 static void fill_frame(struct gspca_dev *gspca_dev,
307 u8 *data; /* address of data in the iso message */
311 if (urb->status != 0) {
312 if (urb->status == -ESHUTDOWN)
313 return; /* disconnection */
315 if (gspca_dev->frozen)
318 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
322 pkt_scan = gspca_dev->sd_desc->pkt_scan;
323 for (i = 0; i < urb->number_of_packets; i++) {
324 len = urb->iso_frame_desc[i].actual_length;
326 /* check the packet status and length */
327 st = urb->iso_frame_desc[i].status;
329 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
331 gspca_dev->last_packet_type = DISCARD_PACKET;
335 if (gspca_dev->empty_packet == 0)
336 gspca_dev->empty_packet = 1;
340 /* let the packet be analyzed by the subdriver */
341 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
342 i, urb->iso_frame_desc[i].offset, len);
343 data = (u8 *) urb->transfer_buffer
344 + urb->iso_frame_desc[i].offset;
345 pkt_scan(gspca_dev, data, len);
349 /* resubmit the URB */
350 st = usb_submit_urb(urb, GFP_ATOMIC);
352 pr_err("usb_submit_urb() ret %d\n", st);
356 * ISOC message interrupt from the USB device
358 * Analyse each packet and call the subdriver for copy to the frame buffer.
360 static void isoc_irq(struct urb *urb)
362 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
364 PDEBUG(D_PACK, "isoc irq");
365 if (!gspca_dev->streaming)
367 fill_frame(gspca_dev, urb);
371 * bulk message interrupt from the USB device
373 static void bulk_irq(struct urb *urb)
375 struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
378 PDEBUG(D_PACK, "bulk irq");
379 if (!gspca_dev->streaming)
381 switch (urb->status) {
385 return; /* disconnection */
388 if (gspca_dev->frozen)
391 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
396 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
397 gspca_dev->sd_desc->pkt_scan(gspca_dev,
398 urb->transfer_buffer,
402 /* resubmit the URB */
403 if (gspca_dev->cam.bulk_nurbs != 0) {
404 st = usb_submit_urb(urb, GFP_ATOMIC);
406 pr_err("usb_submit_urb() ret %d\n", st);
411 * add data to the current frame
413 * This function is called by the subdrivers at interrupt level.
415 * To build a frame, these ones must add
417 * - 0 or many INTER_PACKETs
419 * DISCARD_PACKET invalidates the whole frame.
421 void gspca_frame_add(struct gspca_dev *gspca_dev,
422 enum gspca_packet_type packet_type,
426 struct gspca_frame *frame;
429 PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
431 if (packet_type == FIRST_PACKET) {
432 i = atomic_read(&gspca_dev->fr_i);
434 /* if there are no queued buffer, discard the whole frame */
435 if (i == atomic_read(&gspca_dev->fr_q)) {
436 gspca_dev->last_packet_type = DISCARD_PACKET;
437 gspca_dev->sequence++;
440 j = gspca_dev->fr_queue[i];
441 frame = &gspca_dev->frame[j];
442 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
443 frame->v4l2_buf.sequence = gspca_dev->sequence++;
444 gspca_dev->image = frame->data;
445 gspca_dev->image_len = 0;
447 switch (gspca_dev->last_packet_type) {
449 if (packet_type == LAST_PACKET) {
450 gspca_dev->last_packet_type = packet_type;
451 gspca_dev->image = NULL;
452 gspca_dev->image_len = 0;
460 /* append the packet to the frame buffer */
462 if (gspca_dev->image_len + len > gspca_dev->frsz) {
463 PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
464 gspca_dev->image_len + len,
466 packet_type = DISCARD_PACKET;
468 /* !! image is NULL only when last pkt is LAST or DISCARD
469 if (gspca_dev->image == NULL) {
470 pr_err("gspca_frame_add() image == NULL\n");
474 memcpy(gspca_dev->image + gspca_dev->image_len,
476 gspca_dev->image_len += len;
479 gspca_dev->last_packet_type = packet_type;
481 /* if last packet, invalidate packet concatenation until
482 * next first packet, wake up the application and advance
484 if (packet_type == LAST_PACKET) {
485 i = atomic_read(&gspca_dev->fr_i);
486 j = gspca_dev->fr_queue[i];
487 frame = &gspca_dev->frame[j];
488 frame->v4l2_buf.bytesused = gspca_dev->image_len;
489 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
490 | V4L2_BUF_FLAG_DONE)
491 & ~V4L2_BUF_FLAG_QUEUED;
492 i = (i + 1) % GSPCA_MAX_FRAMES;
493 atomic_set(&gspca_dev->fr_i, i);
494 wake_up_interruptible(&gspca_dev->wq); /* event = new frame */
495 PDEBUG(D_FRAM, "frame complete len:%d",
496 frame->v4l2_buf.bytesused);
497 gspca_dev->image = NULL;
498 gspca_dev->image_len = 0;
501 EXPORT_SYMBOL(gspca_frame_add);
503 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
504 enum v4l2_memory memory, unsigned int count)
506 struct gspca_frame *frame;
510 i = gspca_dev->curr_mode;
511 frsz = gspca_dev->cam.cam_mode[i].sizeimage;
512 PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
513 frsz = PAGE_ALIGN(frsz);
514 if (count >= GSPCA_MAX_FRAMES)
515 count = GSPCA_MAX_FRAMES - 1;
516 gspca_dev->frbuf = vmalloc_32(frsz * count);
517 if (!gspca_dev->frbuf) {
518 pr_err("frame alloc failed\n");
521 gspca_dev->capt_file = file;
522 gspca_dev->memory = memory;
523 gspca_dev->frsz = frsz;
524 gspca_dev->nframes = count;
525 for (i = 0; i < count; i++) {
526 frame = &gspca_dev->frame[i];
527 frame->v4l2_buf.index = i;
528 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
529 frame->v4l2_buf.flags = 0;
530 frame->v4l2_buf.field = V4L2_FIELD_NONE;
531 frame->v4l2_buf.length = frsz;
532 frame->v4l2_buf.memory = memory;
533 frame->v4l2_buf.sequence = 0;
534 frame->data = gspca_dev->frbuf + i * frsz;
535 frame->v4l2_buf.m.offset = i * frsz;
537 atomic_set(&gspca_dev->fr_q, 0);
538 atomic_set(&gspca_dev->fr_i, 0);
543 static void frame_free(struct gspca_dev *gspca_dev)
547 PDEBUG(D_STREAM, "frame free");
548 if (gspca_dev->frbuf != NULL) {
549 vfree(gspca_dev->frbuf);
550 gspca_dev->frbuf = NULL;
551 for (i = 0; i < gspca_dev->nframes; i++)
552 gspca_dev->frame[i].data = NULL;
554 gspca_dev->nframes = 0;
556 gspca_dev->capt_file = NULL;
557 gspca_dev->memory = GSPCA_MEMORY_NO;
560 static void destroy_urbs(struct gspca_dev *gspca_dev)
565 PDEBUG(D_STREAM, "kill transfer");
566 for (i = 0; i < MAX_NURBS; i++) {
567 urb = gspca_dev->urb[i];
571 gspca_dev->urb[i] = NULL;
573 if (urb->transfer_buffer != NULL)
574 usb_free_coherent(gspca_dev->dev,
575 urb->transfer_buffer_length,
576 urb->transfer_buffer,
582 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
586 if (gspca_dev->alt == 0)
588 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
590 pr_err("set alt 0 err %d\n", ret);
594 /* Note: both the queue and the usb locks should be held when calling this */
595 static void gspca_stream_off(struct gspca_dev *gspca_dev)
597 gspca_dev->streaming = 0;
598 gspca_dev->usb_err = 0;
599 if (gspca_dev->sd_desc->stopN)
600 gspca_dev->sd_desc->stopN(gspca_dev);
601 destroy_urbs(gspca_dev);
602 gspca_input_destroy_urb(gspca_dev);
603 gspca_set_alt0(gspca_dev);
604 gspca_input_create_urb(gspca_dev);
605 if (gspca_dev->sd_desc->stop0)
606 gspca_dev->sd_desc->stop0(gspca_dev);
607 PDEBUG(D_STREAM, "stream off OK");
611 * look for an input transfer endpoint in an alternate setting
613 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
616 struct usb_host_endpoint *ep;
619 for (i = 0; i < alt->desc.bNumEndpoints; i++) {
620 ep = &alt->endpoint[i];
621 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
623 && ep->desc.wMaxPacketSize != 0
624 && usb_endpoint_dir_in(&ep->desc))
630 /* compute the minimum bandwidth for the current transfer */
631 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
636 /* get the (max) image size */
637 i = gspca_dev->curr_mode;
638 bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
640 /* if the image is compressed, estimate its mean size */
641 if (!gspca_dev->cam.needs_full_bandwidth &&
642 bandwidth < gspca_dev->cam.cam_mode[i].width *
643 gspca_dev->cam.cam_mode[i].height)
644 bandwidth = bandwidth * 3 / 8; /* 0.375 */
646 /* estimate the frame rate */
647 if (gspca_dev->sd_desc->get_streamparm) {
648 struct v4l2_streamparm parm;
650 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
651 bandwidth *= parm.parm.capture.timeperframe.denominator;
652 bandwidth /= parm.parm.capture.timeperframe.numerator;
655 /* don't hope more than 15 fps with USB 1.1 and
656 * image resolution >= 640x480 */
657 if (gspca_dev->width >= 640
658 && gspca_dev->dev->speed == USB_SPEED_FULL)
659 bandwidth *= 15; /* 15 fps */
661 bandwidth *= 30; /* 30 fps */
664 PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
676 * build the table of the endpoints
677 * and compute the minimum bandwidth for the image transfer
679 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
680 struct usb_interface *intf,
681 struct ep_tb_s *ep_tb)
683 struct usb_host_endpoint *ep;
684 int i, j, nbalt, psize, found;
685 u32 bandwidth, last_bw;
687 nbalt = intf->num_altsetting;
689 nbalt = MAX_ALT; /* fixme: should warn */
691 /* build the endpoint table */
695 ep_tb->bandwidth = 2000 * 2000 * 120;
697 for (j = 0; j < nbalt; j++) {
698 ep = alt_xfer(&intf->altsetting[j],
699 USB_ENDPOINT_XFER_ISOC);
702 if (ep->desc.bInterval == 0) {
703 pr_err("alt %d iso endp with 0 interval\n", j);
706 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
707 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
708 bandwidth = psize * 1000;
709 if (gspca_dev->dev->speed == USB_SPEED_HIGH
710 || gspca_dev->dev->speed == USB_SPEED_SUPER)
712 bandwidth /= 1 << (ep->desc.bInterval - 1);
713 if (bandwidth <= last_bw)
715 if (bandwidth < ep_tb->bandwidth) {
716 ep_tb->bandwidth = bandwidth;
723 PDEBUG(D_STREAM, "alt %d bandwidth %d",
724 ep_tb->alt, ep_tb->bandwidth);
725 last_bw = ep_tb->bandwidth;
732 * has a usb audio class interface (a built in usb mic); and
733 * is a usb 1 full speed device; and
734 * uses the max full speed iso bandwidth; and
735 * and has more than 1 alt setting
736 * then skip the highest alt setting to spare bandwidth for the mic
738 if (gspca_dev->audio &&
739 gspca_dev->dev->speed == USB_SPEED_FULL &&
740 last_bw >= 1000000 &&
742 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
747 /* get the requested bandwidth and start at the highest atlsetting */
748 bandwidth = which_bandwidth(gspca_dev);
752 if (ep_tb->bandwidth < bandwidth)
760 * create the URBs for image transfer
762 static int create_urbs(struct gspca_dev *gspca_dev,
763 struct usb_host_endpoint *ep)
766 int n, nurbs, i, psize, npkt, bsize;
768 /* calculate the packet size and the number of packets */
769 psize = le16_to_cpu(ep->desc.wMaxPacketSize);
771 if (!gspca_dev->cam.bulk) { /* isoc */
773 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
774 if (gspca_dev->pkt_size == 0)
775 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
777 psize = gspca_dev->pkt_size;
778 npkt = gspca_dev->cam.npkt;
780 npkt = 32; /* default value */
781 bsize = psize * npkt;
783 "isoc %d pkts size %d = bsize:%d",
788 bsize = gspca_dev->cam.bulk_size;
791 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
792 if (gspca_dev->cam.bulk_nurbs != 0)
793 nurbs = gspca_dev->cam.bulk_nurbs;
798 for (n = 0; n < nurbs; n++) {
799 urb = usb_alloc_urb(npkt, GFP_KERNEL);
801 pr_err("usb_alloc_urb failed\n");
804 gspca_dev->urb[n] = urb;
805 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
810 if (urb->transfer_buffer == NULL) {
811 pr_err("usb_alloc_coherent failed\n");
814 urb->dev = gspca_dev->dev;
815 urb->context = gspca_dev;
816 urb->transfer_buffer_length = bsize;
817 if (npkt != 0) { /* ISOC */
818 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
819 ep->desc.bEndpointAddress);
820 urb->transfer_flags = URB_ISO_ASAP
821 | URB_NO_TRANSFER_DMA_MAP;
822 urb->interval = 1 << (ep->desc.bInterval - 1);
823 urb->complete = isoc_irq;
824 urb->number_of_packets = npkt;
825 for (i = 0; i < npkt; i++) {
826 urb->iso_frame_desc[i].length = psize;
827 urb->iso_frame_desc[i].offset = psize * i;
830 urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
831 ep->desc.bEndpointAddress);
832 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
833 urb->complete = bulk_irq;
840 * start the USB transfer
842 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
844 struct usb_interface *intf;
845 struct usb_host_endpoint *ep;
847 struct ep_tb_s ep_tb[MAX_ALT];
848 int n, ret, xfer, alt, alt_idx;
850 /* reset the streaming variables */
851 gspca_dev->image = NULL;
852 gspca_dev->image_len = 0;
853 gspca_dev->last_packet_type = DISCARD_PACKET;
854 gspca_dev->sequence = 0;
856 gspca_dev->usb_err = 0;
858 /* do the specific subdriver stuff before endpoint selection */
859 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
860 gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
861 if (gspca_dev->sd_desc->isoc_init) {
862 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
866 xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
867 : USB_ENDPOINT_XFER_ISOC;
869 /* if bulk or the subdriver forced an altsetting, get the endpoint */
870 if (gspca_dev->alt != 0) {
871 gspca_dev->alt--; /* (previous version compatibility) */
872 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
874 pr_err("bad altsetting %d\n", gspca_dev->alt);
877 ep_tb[0].alt = gspca_dev->alt;
881 /* else, compute the minimum bandwidth
882 * and build the endpoint table */
883 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
885 pr_err("no transfer endpoint found\n");
890 /* set the highest alternate setting and
891 * loop until urb submit succeeds */
892 gspca_input_destroy_urb(gspca_dev);
894 gspca_dev->alt = ep_tb[--alt_idx].alt;
897 if (alt != gspca_dev->alt) {
898 alt = gspca_dev->alt;
899 if (intf->num_altsetting > 1) {
900 ret = usb_set_interface(gspca_dev->dev,
905 goto retry; /*fixme: ugly*/
906 pr_err("set alt %d err %d\n", alt, ret);
911 if (!gspca_dev->cam.no_urb_create) {
912 PDEBUG(D_STREAM, "init transfer alt %d", alt);
913 ret = create_urbs(gspca_dev,
914 alt_xfer(&intf->altsetting[alt], xfer));
916 destroy_urbs(gspca_dev);
921 /* clear the bulk endpoint */
922 if (gspca_dev->cam.bulk)
923 usb_clear_halt(gspca_dev->dev,
924 gspca_dev->urb[0]->pipe);
927 ret = gspca_dev->sd_desc->start(gspca_dev);
929 destroy_urbs(gspca_dev);
932 gspca_dev->streaming = 1;
933 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
935 /* some bulk transfers are started by the subdriver */
936 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
939 /* submit the URBs */
940 for (n = 0; n < MAX_NURBS; n++) {
941 urb = gspca_dev->urb[n];
944 ret = usb_submit_urb(urb, GFP_KERNEL);
949 break; /* transfer is started */
951 /* something when wrong
952 * stop the webcam and free the transfer resources */
953 gspca_stream_off(gspca_dev);
954 if (ret != -ENOSPC) {
955 pr_err("usb_submit_urb alt %d err %d\n",
956 gspca_dev->alt, ret);
960 /* the bandwidth is not wide enough
961 * negotiate or try a lower alternate setting */
963 PDEBUG(D_ERR|D_STREAM,
964 "alt %d - bandwidth not wide enough - trying again",
966 msleep(20); /* wait for kill complete */
967 if (gspca_dev->sd_desc->isoc_nego) {
968 ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
973 pr_err("no transfer endpoint found\n");
977 gspca_dev->alt = ep_tb[--alt_idx].alt;
981 gspca_input_create_urb(gspca_dev);
985 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
987 struct gspca_ctrl *ctrl;
990 i = gspca_dev->cam.nmodes - 1; /* take the highest mode */
991 gspca_dev->curr_mode = i;
992 gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
993 gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
994 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
996 /* set the current control values to their default values
997 * which may have changed in sd_init() */
998 /* does nothing if ctrl_handler == NULL */
999 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
1000 ctrl = gspca_dev->cam.ctrls;
1003 i < gspca_dev->sd_desc->nctrls;
1005 ctrl->val = ctrl->def;
1009 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1010 int width, int height)
1014 for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1015 if (width >= gspca_dev->cam.cam_mode[i].width
1016 && height >= gspca_dev->cam.cam_mode[i].height)
1023 * search a mode with the right pixel format
1025 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1031 modeU = modeD = mode;
1032 while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1034 if (gspca_dev->cam.cam_mode[modeD].pixelformat
1038 if (++modeU < gspca_dev->cam.nmodes) {
1039 if (gspca_dev->cam.cam_mode[modeU].pixelformat
1047 #ifdef CONFIG_VIDEO_ADV_DEBUG
1048 static int vidioc_g_register(struct file *file, void *priv,
1049 struct v4l2_dbg_register *reg)
1051 struct gspca_dev *gspca_dev = video_drvdata(file);
1053 gspca_dev->usb_err = 0;
1054 return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1057 static int vidioc_s_register(struct file *file, void *priv,
1058 struct v4l2_dbg_register *reg)
1060 struct gspca_dev *gspca_dev = video_drvdata(file);
1062 gspca_dev->usb_err = 0;
1063 return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1067 static int vidioc_g_chip_ident(struct file *file, void *priv,
1068 struct v4l2_dbg_chip_ident *chip)
1070 struct gspca_dev *gspca_dev = video_drvdata(file);
1072 gspca_dev->usb_err = 0;
1073 return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1076 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
1077 struct v4l2_fmtdesc *fmtdesc)
1079 struct gspca_dev *gspca_dev = video_drvdata(file);
1083 /* give an index to each format */
1086 for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1087 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1090 if (fmt_tb[j] == fmt_tb[index])
1095 if (fmtdesc->index == index)
1096 break; /* new format */
1098 if (index >= ARRAY_SIZE(fmt_tb))
1103 return -EINVAL; /* no more format */
1105 fmtdesc->pixelformat = fmt_tb[index];
1106 if (gspca_dev->cam.cam_mode[i].sizeimage <
1107 gspca_dev->cam.cam_mode[i].width *
1108 gspca_dev->cam.cam_mode[i].height)
1109 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1110 fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1111 fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1112 fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1113 fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1114 fmtdesc->description[4] = '\0';
1118 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1119 struct v4l2_format *fmt)
1121 struct gspca_dev *gspca_dev = video_drvdata(file);
1124 mode = gspca_dev->curr_mode;
1125 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1126 /* some drivers use priv internally, zero it before giving it to
1128 fmt->fmt.pix.priv = 0;
1132 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1133 struct v4l2_format *fmt)
1135 int w, h, mode, mode2;
1137 w = fmt->fmt.pix.width;
1138 h = fmt->fmt.pix.height;
1141 if (gspca_debug & D_CONF)
1142 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1144 /* search the closest mode for width and height */
1145 mode = wxh_to_mode(gspca_dev, w, h);
1147 /* OK if right palette */
1148 if (gspca_dev->cam.cam_mode[mode].pixelformat
1149 != fmt->fmt.pix.pixelformat) {
1151 /* else, search the closest mode with the same pixel format */
1152 mode2 = gspca_get_mode(gspca_dev, mode,
1153 fmt->fmt.pix.pixelformat);
1157 ; * no chance, return this mode */
1159 fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1160 /* some drivers use priv internally, zero it before giving it to
1162 fmt->fmt.pix.priv = 0;
1163 return mode; /* used when s_fmt */
1166 static int vidioc_try_fmt_vid_cap(struct file *file,
1168 struct v4l2_format *fmt)
1170 struct gspca_dev *gspca_dev = video_drvdata(file);
1173 ret = try_fmt_vid_cap(gspca_dev, fmt);
1179 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1180 struct v4l2_format *fmt)
1182 struct gspca_dev *gspca_dev = video_drvdata(file);
1185 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1186 return -ERESTARTSYS;
1188 ret = try_fmt_vid_cap(gspca_dev, fmt);
1192 if (gspca_dev->nframes != 0
1193 && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1198 if (ret == gspca_dev->curr_mode) {
1200 goto out; /* same mode */
1203 if (gspca_dev->streaming) {
1207 gspca_dev->width = fmt->fmt.pix.width;
1208 gspca_dev->height = fmt->fmt.pix.height;
1209 gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1210 gspca_dev->curr_mode = ret;
1214 mutex_unlock(&gspca_dev->queue_lock);
1218 static int vidioc_enum_framesizes(struct file *file, void *priv,
1219 struct v4l2_frmsizeenum *fsize)
1221 struct gspca_dev *gspca_dev = video_drvdata(file);
1225 for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1226 if (fsize->pixel_format !=
1227 gspca_dev->cam.cam_mode[i].pixelformat)
1230 if (fsize->index == index) {
1231 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1232 fsize->discrete.width =
1233 gspca_dev->cam.cam_mode[i].width;
1234 fsize->discrete.height =
1235 gspca_dev->cam.cam_mode[i].height;
1244 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1245 struct v4l2_frmivalenum *fival)
1247 struct gspca_dev *gspca_dev = video_drvdata(filp);
1248 int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1251 if (gspca_dev->cam.mode_framerates == NULL ||
1252 gspca_dev->cam.mode_framerates[mode].nrates == 0)
1255 if (fival->pixel_format !=
1256 gspca_dev->cam.cam_mode[mode].pixelformat)
1259 for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1260 if (fival->index == i) {
1261 fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1262 fival->discrete.numerator = 1;
1263 fival->discrete.denominator =
1264 gspca_dev->cam.mode_framerates[mode].rates[i];
1272 static void gspca_release(struct v4l2_device *v4l2_device)
1274 struct gspca_dev *gspca_dev =
1275 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1277 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1278 v4l2_device_unregister(&gspca_dev->v4l2_dev);
1279 kfree(gspca_dev->usb_buf);
1283 static int dev_open(struct file *file)
1285 struct gspca_dev *gspca_dev = video_drvdata(file);
1287 PDEBUG(D_STREAM, "[%s] open", current->comm);
1289 /* protect the subdriver against rmmod */
1290 if (!try_module_get(gspca_dev->module))
1294 /* activate the v4l2 debug */
1295 if (gspca_debug & D_V4L2)
1296 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1297 | V4L2_DEBUG_IOCTL_ARG;
1299 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1300 | V4L2_DEBUG_IOCTL_ARG);
1302 return v4l2_fh_open(file);
1305 static int dev_close(struct file *file)
1307 struct gspca_dev *gspca_dev = video_drvdata(file);
1309 PDEBUG(D_STREAM, "[%s] close", current->comm);
1311 /* Needed for gspca_stream_off, always lock before queue_lock! */
1312 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1313 return -ERESTARTSYS;
1315 if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1316 mutex_unlock(&gspca_dev->usb_lock);
1317 return -ERESTARTSYS;
1320 /* if the file did the capture, free the streaming resources */
1321 if (gspca_dev->capt_file == file) {
1322 if (gspca_dev->streaming)
1323 gspca_stream_off(gspca_dev);
1324 frame_free(gspca_dev);
1326 module_put(gspca_dev->module);
1327 mutex_unlock(&gspca_dev->queue_lock);
1328 mutex_unlock(&gspca_dev->usb_lock);
1330 PDEBUG(D_STREAM, "close done");
1332 return v4l2_fh_release(file);
1335 static int vidioc_querycap(struct file *file, void *priv,
1336 struct v4l2_capability *cap)
1338 struct gspca_dev *gspca_dev = video_drvdata(file);
1340 strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1341 sizeof cap->driver);
1342 if (gspca_dev->dev->product != NULL) {
1343 strlcpy((char *) cap->card, gspca_dev->dev->product,
1346 snprintf((char *) cap->card, sizeof cap->card,
1347 "USB Camera (%04x:%04x)",
1348 le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1349 le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1351 usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1352 sizeof(cap->bus_info));
1353 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1354 | V4L2_CAP_STREAMING
1355 | V4L2_CAP_READWRITE;
1356 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1360 static int get_ctrl(struct gspca_dev *gspca_dev,
1363 const struct ctrl *ctrls;
1366 for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1367 i < gspca_dev->sd_desc->nctrls;
1369 if (gspca_dev->ctrl_dis & (1 << i))
1371 if (id == ctrls->qctrl.id)
1377 static int vidioc_queryctrl(struct file *file, void *priv,
1378 struct v4l2_queryctrl *q_ctrl)
1380 struct gspca_dev *gspca_dev = video_drvdata(file);
1381 const struct ctrl *ctrls;
1382 struct gspca_ctrl *gspca_ctrl;
1387 if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1388 id &= V4L2_CTRL_ID_MASK;
1391 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1392 if (gspca_dev->ctrl_dis & (1 << i))
1394 if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1397 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1398 > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1403 idx = get_ctrl(gspca_dev, id);
1407 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1408 memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1409 if (gspca_dev->cam.ctrls != NULL) {
1410 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1411 q_ctrl->default_value = gspca_ctrl->def;
1412 q_ctrl->minimum = gspca_ctrl->min;
1413 q_ctrl->maximum = gspca_ctrl->max;
1415 if (gspca_dev->ctrl_inac & (1 << idx))
1416 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1420 static int vidioc_s_ctrl(struct file *file, void *priv,
1421 struct v4l2_control *ctrl)
1423 struct gspca_dev *gspca_dev = video_drvdata(file);
1424 const struct ctrl *ctrls;
1425 struct gspca_ctrl *gspca_ctrl;
1428 idx = get_ctrl(gspca_dev, ctrl->id);
1431 if (gspca_dev->ctrl_inac & (1 << idx))
1433 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1434 if (gspca_dev->cam.ctrls != NULL) {
1435 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1436 if (ctrl->value < gspca_ctrl->min
1437 || ctrl->value > gspca_ctrl->max)
1441 if (ctrl->value < ctrls->qctrl.minimum
1442 || ctrl->value > ctrls->qctrl.maximum)
1445 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1446 gspca_dev->usb_err = 0;
1447 if (ctrls->set != NULL)
1448 return ctrls->set(gspca_dev, ctrl->value);
1449 if (gspca_ctrl != NULL) {
1450 gspca_ctrl->val = ctrl->value;
1451 if (ctrls->set_control != NULL
1452 && gspca_dev->streaming)
1453 ctrls->set_control(gspca_dev);
1455 return gspca_dev->usb_err;
1458 static int vidioc_g_ctrl(struct file *file, void *priv,
1459 struct v4l2_control *ctrl)
1461 struct gspca_dev *gspca_dev = video_drvdata(file);
1462 const struct ctrl *ctrls;
1465 idx = get_ctrl(gspca_dev, ctrl->id);
1468 ctrls = &gspca_dev->sd_desc->ctrls[idx];
1470 gspca_dev->usb_err = 0;
1471 if (ctrls->get != NULL)
1472 return ctrls->get(gspca_dev, &ctrl->value);
1473 if (gspca_dev->cam.ctrls != NULL)
1474 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1478 static int vidioc_querymenu(struct file *file, void *priv,
1479 struct v4l2_querymenu *qmenu)
1481 struct gspca_dev *gspca_dev = video_drvdata(file);
1483 if (!gspca_dev->sd_desc->querymenu)
1485 return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1488 static int vidioc_enum_input(struct file *file, void *priv,
1489 struct v4l2_input *input)
1491 struct gspca_dev *gspca_dev = video_drvdata(file);
1493 if (input->index != 0)
1495 input->type = V4L2_INPUT_TYPE_CAMERA;
1496 input->status = gspca_dev->cam.input_flags;
1497 strlcpy(input->name, gspca_dev->sd_desc->name,
1498 sizeof input->name);
1502 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1508 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1515 static int vidioc_reqbufs(struct file *file, void *priv,
1516 struct v4l2_requestbuffers *rb)
1518 struct gspca_dev *gspca_dev = video_drvdata(file);
1519 int i, ret = 0, streaming;
1521 i = rb->memory; /* (avoid compilation warning) */
1523 case GSPCA_MEMORY_READ: /* (internal call) */
1524 case V4L2_MEMORY_MMAP:
1525 case V4L2_MEMORY_USERPTR:
1530 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1531 return -ERESTARTSYS;
1533 if (gspca_dev->memory != GSPCA_MEMORY_NO
1534 && gspca_dev->memory != GSPCA_MEMORY_READ
1535 && gspca_dev->memory != rb->memory) {
1540 /* only one file may do the capture */
1541 if (gspca_dev->capt_file != NULL
1542 && gspca_dev->capt_file != file) {
1547 /* if allocated, the buffers must not be mapped */
1548 for (i = 0; i < gspca_dev->nframes; i++) {
1549 if (gspca_dev->frame[i].vma_use_count) {
1555 /* stop streaming */
1556 streaming = gspca_dev->streaming;
1558 gspca_stream_off(gspca_dev);
1560 /* Don't restart the stream when switching from read
1562 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1566 /* free the previous allocated buffers, if any */
1567 if (gspca_dev->nframes != 0)
1568 frame_free(gspca_dev);
1569 if (rb->count == 0) /* unrequest */
1571 ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1573 rb->count = gspca_dev->nframes;
1575 ret = gspca_init_transfer(gspca_dev);
1578 mutex_unlock(&gspca_dev->queue_lock);
1579 PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1583 static int vidioc_querybuf(struct file *file, void *priv,
1584 struct v4l2_buffer *v4l2_buf)
1586 struct gspca_dev *gspca_dev = video_drvdata(file);
1587 struct gspca_frame *frame;
1589 if (v4l2_buf->index >= gspca_dev->nframes)
1592 frame = &gspca_dev->frame[v4l2_buf->index];
1593 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1597 static int vidioc_streamon(struct file *file, void *priv,
1598 enum v4l2_buf_type buf_type)
1600 struct gspca_dev *gspca_dev = video_drvdata(file);
1603 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1605 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1606 return -ERESTARTSYS;
1608 /* check the capture file */
1609 if (gspca_dev->capt_file != file) {
1614 if (gspca_dev->nframes == 0
1615 || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1619 if (!gspca_dev->streaming) {
1620 ret = gspca_init_transfer(gspca_dev);
1625 if (gspca_debug & D_STREAM) {
1626 PDEBUG_MODE("stream on OK",
1634 mutex_unlock(&gspca_dev->queue_lock);
1638 static int vidioc_streamoff(struct file *file, void *priv,
1639 enum v4l2_buf_type buf_type)
1641 struct gspca_dev *gspca_dev = video_drvdata(file);
1644 if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1647 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1648 return -ERESTARTSYS;
1650 if (!gspca_dev->streaming) {
1655 /* check the capture file */
1656 if (gspca_dev->capt_file != file) {
1661 /* stop streaming */
1662 gspca_stream_off(gspca_dev);
1663 /* In case another thread is waiting in dqbuf */
1664 wake_up_interruptible(&gspca_dev->wq);
1666 /* empty the transfer queues */
1667 for (i = 0; i < gspca_dev->nframes; i++)
1668 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1669 atomic_set(&gspca_dev->fr_q, 0);
1670 atomic_set(&gspca_dev->fr_i, 0);
1671 gspca_dev->fr_o = 0;
1674 mutex_unlock(&gspca_dev->queue_lock);
1678 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1679 struct v4l2_jpegcompression *jpegcomp)
1681 struct gspca_dev *gspca_dev = video_drvdata(file);
1683 gspca_dev->usb_err = 0;
1684 return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1687 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1688 const struct v4l2_jpegcompression *jpegcomp)
1690 struct gspca_dev *gspca_dev = video_drvdata(file);
1692 gspca_dev->usb_err = 0;
1693 return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1696 static int vidioc_g_parm(struct file *filp, void *priv,
1697 struct v4l2_streamparm *parm)
1699 struct gspca_dev *gspca_dev = video_drvdata(filp);
1701 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1703 if (gspca_dev->sd_desc->get_streamparm) {
1704 gspca_dev->usb_err = 0;
1705 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1706 return gspca_dev->usb_err;
1711 static int vidioc_s_parm(struct file *filp, void *priv,
1712 struct v4l2_streamparm *parm)
1714 struct gspca_dev *gspca_dev = video_drvdata(filp);
1717 n = parm->parm.capture.readbuffers;
1718 if (n == 0 || n >= GSPCA_MAX_FRAMES)
1719 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1721 gspca_dev->nbufread = n;
1723 if (gspca_dev->sd_desc->set_streamparm) {
1724 gspca_dev->usb_err = 0;
1725 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1726 return gspca_dev->usb_err;
1732 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1734 struct gspca_dev *gspca_dev = video_drvdata(file);
1735 struct gspca_frame *frame;
1737 unsigned long addr, start, size;
1740 start = vma->vm_start;
1741 size = vma->vm_end - vma->vm_start;
1742 PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1744 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1745 return -ERESTARTSYS;
1746 if (gspca_dev->capt_file != file) {
1752 for (i = 0; i < gspca_dev->nframes; ++i) {
1753 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1754 PDEBUG(D_STREAM, "mmap bad memory type");
1757 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1759 frame = &gspca_dev->frame[i];
1763 if (frame == NULL) {
1764 PDEBUG(D_STREAM, "mmap no frame buffer found");
1768 if (size != frame->v4l2_buf.length) {
1769 PDEBUG(D_STREAM, "mmap bad size");
1775 * - VM_IO marks the area as being a mmaped region for I/O to a
1776 * device. It also prevents the region from being core dumped.
1778 vma->vm_flags |= VM_IO;
1780 addr = (unsigned long) frame->data;
1782 page = vmalloc_to_page((void *) addr);
1783 ret = vm_insert_page(vma, start, page);
1791 vma->vm_ops = &gspca_vm_ops;
1792 vma->vm_private_data = frame;
1796 mutex_unlock(&gspca_dev->queue_lock);
1800 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1801 enum v4l2_memory memory)
1803 if (!gspca_dev->present)
1805 if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1806 !gspca_dev->streaming)
1809 /* check if a frame is ready */
1810 return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1813 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1814 enum v4l2_memory memory)
1818 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1819 return -ERESTARTSYS;
1820 ret = frame_ready_nolock(gspca_dev, file, memory);
1821 mutex_unlock(&gspca_dev->queue_lock);
1826 * dequeue a video buffer
1828 * If nonblock_ing is false, block until a buffer is available.
1830 static int vidioc_dqbuf(struct file *file, void *priv,
1831 struct v4l2_buffer *v4l2_buf)
1833 struct gspca_dev *gspca_dev = video_drvdata(file);
1834 struct gspca_frame *frame;
1837 PDEBUG(D_FRAM, "dqbuf");
1839 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1840 return -ERESTARTSYS;
1843 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1849 mutex_unlock(&gspca_dev->queue_lock);
1851 if (file->f_flags & O_NONBLOCK)
1854 /* wait till a frame is ready */
1855 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1856 frame_ready(gspca_dev, file, v4l2_buf->memory),
1857 msecs_to_jiffies(3000));
1863 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1864 return -ERESTARTSYS;
1867 i = gspca_dev->fr_o;
1868 j = gspca_dev->fr_queue[i];
1869 frame = &gspca_dev->frame[j];
1871 gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1873 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1874 memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1875 PDEBUG(D_FRAM, "dqbuf %d", j);
1878 if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1879 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1881 frame->v4l2_buf.bytesused)) {
1882 PDEBUG(D_ERR|D_STREAM,
1883 "dqbuf cp to user failed");
1888 mutex_unlock(&gspca_dev->queue_lock);
1890 if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1891 mutex_lock(&gspca_dev->usb_lock);
1892 gspca_dev->usb_err = 0;
1893 if (gspca_dev->present)
1894 gspca_dev->sd_desc->dq_callback(gspca_dev);
1895 mutex_unlock(&gspca_dev->usb_lock);
1902 * queue a video buffer
1904 * Attempting to queue a buffer that has already been
1905 * queued will return -EINVAL.
1907 static int vidioc_qbuf(struct file *file, void *priv,
1908 struct v4l2_buffer *v4l2_buf)
1910 struct gspca_dev *gspca_dev = video_drvdata(file);
1911 struct gspca_frame *frame;
1914 PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1916 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1917 return -ERESTARTSYS;
1919 index = v4l2_buf->index;
1920 if ((unsigned) index >= gspca_dev->nframes) {
1922 "qbuf idx %d >= %d", index, gspca_dev->nframes);
1926 if (v4l2_buf->memory != gspca_dev->memory) {
1927 PDEBUG(D_FRAM, "qbuf bad memory type");
1932 frame = &gspca_dev->frame[index];
1933 if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1934 PDEBUG(D_FRAM, "qbuf bad state");
1939 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1941 if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1942 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1943 frame->v4l2_buf.length = v4l2_buf->length;
1946 /* put the buffer in the 'queued' queue */
1947 i = atomic_read(&gspca_dev->fr_q);
1948 gspca_dev->fr_queue[i] = index;
1949 atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1951 v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1952 v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1955 mutex_unlock(&gspca_dev->queue_lock);
1960 * allocate the resources for read()
1962 static int read_alloc(struct gspca_dev *gspca_dev,
1965 struct v4l2_buffer v4l2_buf;
1968 PDEBUG(D_STREAM, "read alloc");
1970 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1971 return -ERESTARTSYS;
1973 if (gspca_dev->nframes == 0) {
1974 struct v4l2_requestbuffers rb;
1976 memset(&rb, 0, sizeof rb);
1977 rb.count = gspca_dev->nbufread;
1978 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1979 rb.memory = GSPCA_MEMORY_READ;
1980 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1982 PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1985 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1986 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1987 v4l2_buf.memory = GSPCA_MEMORY_READ;
1988 for (i = 0; i < gspca_dev->nbufread; i++) {
1990 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1992 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1998 /* start streaming */
1999 ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2001 PDEBUG(D_STREAM, "read streamon err %d", ret);
2003 mutex_unlock(&gspca_dev->usb_lock);
2007 static unsigned int dev_poll(struct file *file, poll_table *wait)
2009 struct gspca_dev *gspca_dev = video_drvdata(file);
2010 unsigned long req_events = poll_requested_events(wait);
2013 PDEBUG(D_FRAM, "poll");
2015 if (req_events & POLLPRI)
2016 ret |= v4l2_ctrl_poll(file, wait);
2018 if (req_events & (POLLIN | POLLRDNORM)) {
2019 /* if reqbufs is not done, the user would use read() */
2020 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2021 if (read_alloc(gspca_dev, file) != 0) {
2027 poll_wait(file, &gspca_dev->wq, wait);
2029 /* check if an image has been received */
2030 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
2034 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2035 ret |= POLLIN | POLLRDNORM;
2036 mutex_unlock(&gspca_dev->queue_lock);
2040 if (!gspca_dev->present)
2046 static ssize_t dev_read(struct file *file, char __user *data,
2047 size_t count, loff_t *ppos)
2049 struct gspca_dev *gspca_dev = video_drvdata(file);
2050 struct gspca_frame *frame;
2051 struct v4l2_buffer v4l2_buf;
2052 struct timeval timestamp;
2055 PDEBUG(D_FRAM, "read (%zd)", count);
2056 if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2057 ret = read_alloc(gspca_dev, file);
2063 timestamp = ktime_to_timeval(ktime_get());
2067 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2068 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2069 v4l2_buf.memory = GSPCA_MEMORY_READ;
2070 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2072 PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2076 /* if the process slept for more than 1 second,
2077 * get a newer frame */
2078 frame = &gspca_dev->frame[v4l2_buf.index];
2080 break; /* avoid infinite loop */
2081 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2083 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2085 PDEBUG(D_STREAM, "read qbuf err %d", ret);
2090 /* copy the frame */
2091 if (count > frame->v4l2_buf.bytesused)
2092 count = frame->v4l2_buf.bytesused;
2093 ret = copy_to_user(data, frame->data, count);
2095 PDEBUG(D_ERR|D_STREAM,
2096 "read cp to user lack %d / %zd", ret, count);
2102 /* in each case, requeue the buffer */
2103 ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2109 static struct v4l2_file_operations dev_fops = {
2110 .owner = THIS_MODULE,
2112 .release = dev_close,
2115 .unlocked_ioctl = video_ioctl2,
2119 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2120 .vidioc_querycap = vidioc_querycap,
2121 .vidioc_dqbuf = vidioc_dqbuf,
2122 .vidioc_qbuf = vidioc_qbuf,
2123 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2124 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2125 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
2126 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
2127 .vidioc_streamon = vidioc_streamon,
2128 .vidioc_queryctrl = vidioc_queryctrl,
2129 .vidioc_g_ctrl = vidioc_g_ctrl,
2130 .vidioc_s_ctrl = vidioc_s_ctrl,
2131 .vidioc_querymenu = vidioc_querymenu,
2132 .vidioc_enum_input = vidioc_enum_input,
2133 .vidioc_g_input = vidioc_g_input,
2134 .vidioc_s_input = vidioc_s_input,
2135 .vidioc_reqbufs = vidioc_reqbufs,
2136 .vidioc_querybuf = vidioc_querybuf,
2137 .vidioc_streamoff = vidioc_streamoff,
2138 .vidioc_g_jpegcomp = vidioc_g_jpegcomp,
2139 .vidioc_s_jpegcomp = vidioc_s_jpegcomp,
2140 .vidioc_g_parm = vidioc_g_parm,
2141 .vidioc_s_parm = vidioc_s_parm,
2142 .vidioc_enum_framesizes = vidioc_enum_framesizes,
2143 .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2144 #ifdef CONFIG_VIDEO_ADV_DEBUG
2145 .vidioc_g_register = vidioc_g_register,
2146 .vidioc_s_register = vidioc_s_register,
2148 .vidioc_g_chip_ident = vidioc_g_chip_ident,
2149 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2150 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2153 static const struct video_device gspca_template = {
2154 .name = "gspca main driver",
2156 .ioctl_ops = &dev_ioctl_ops,
2157 .release = video_device_release_empty, /* We use v4l2_dev.release */
2160 /* initialize the controls */
2161 static void ctrls_init(struct gspca_dev *gspca_dev)
2163 struct gspca_ctrl *ctrl;
2166 for (i = 0, ctrl = gspca_dev->cam.ctrls;
2167 i < gspca_dev->sd_desc->nctrls;
2169 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2170 ctrl->val = ctrl->def;
2171 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2172 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2177 * probe and create a new gspca device
2179 * This function must be called by the sub-driver when it is
2180 * called for probing a new device.
2182 int gspca_dev_probe2(struct usb_interface *intf,
2183 const struct usb_device_id *id,
2184 const struct sd_desc *sd_desc,
2186 struct module *module)
2188 struct gspca_dev *gspca_dev;
2189 struct usb_device *dev = interface_to_usbdev(intf);
2192 pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2193 sd_desc->name, id->idVendor, id->idProduct);
2195 /* create the device */
2196 if (dev_size < sizeof *gspca_dev)
2197 dev_size = sizeof *gspca_dev;
2198 gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2200 pr_err("couldn't kzalloc gspca struct\n");
2203 gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2204 if (!gspca_dev->usb_buf) {
2205 pr_err("out of memory\n");
2209 gspca_dev->dev = dev;
2210 gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2212 /* check if any audio device */
2213 if (dev->actconfig->desc.bNumInterfaces != 1) {
2215 struct usb_interface *intf2;
2217 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2218 intf2 = dev->actconfig->interface[i];
2220 && intf2->altsetting != NULL
2221 && intf2->altsetting->desc.bInterfaceClass ==
2223 gspca_dev->audio = 1;
2229 gspca_dev->v4l2_dev.release = gspca_release;
2230 ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2233 gspca_dev->sd_desc = sd_desc;
2234 gspca_dev->nbufread = 2;
2235 gspca_dev->empty_packet = -1; /* don't check the empty packets */
2236 gspca_dev->vdev = gspca_template;
2237 gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2238 video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2239 set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2240 gspca_dev->module = module;
2241 gspca_dev->present = 1;
2243 mutex_init(&gspca_dev->usb_lock);
2244 gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2245 mutex_init(&gspca_dev->queue_lock);
2246 init_waitqueue_head(&gspca_dev->wq);
2248 /* configure the subdriver and initialize the USB device */
2249 ret = sd_desc->config(gspca_dev, id);
2252 if (gspca_dev->cam.ctrls != NULL)
2253 ctrls_init(gspca_dev);
2254 ret = sd_desc->init(gspca_dev);
2257 if (sd_desc->init_controls)
2258 ret = sd_desc->init_controls(gspca_dev);
2261 gspca_set_default_mode(gspca_dev);
2263 ret = gspca_input_connect(gspca_dev);
2268 * Don't take usb_lock for these ioctls. This improves latency if
2269 * usb_lock is taken for a long time, e.g. when changing a control
2270 * value, and a new frame is ready to be dequeued.
2272 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2273 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2274 v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2275 if (!gspca_dev->sd_desc->get_chip_ident)
2276 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_CHIP_IDENT);
2277 #ifdef CONFIG_VIDEO_ADV_DEBUG
2278 if (!gspca_dev->sd_desc->get_chip_ident ||
2279 !gspca_dev->sd_desc->get_register)
2280 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2281 if (!gspca_dev->sd_desc->get_chip_ident ||
2282 !gspca_dev->sd_desc->set_register)
2283 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2285 if (!gspca_dev->sd_desc->get_jcomp)
2286 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2287 if (!gspca_dev->sd_desc->set_jcomp)
2288 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2290 /* init video stuff */
2291 ret = video_register_device(&gspca_dev->vdev,
2295 pr_err("video_register_device err %d\n", ret);
2299 usb_set_intfdata(intf, gspca_dev);
2300 PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2302 gspca_input_create_urb(gspca_dev);
2306 #if IS_ENABLED(CONFIG_INPUT)
2307 if (gspca_dev->input_dev)
2308 input_unregister_device(gspca_dev->input_dev);
2310 v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2311 kfree(gspca_dev->usb_buf);
2315 EXPORT_SYMBOL(gspca_dev_probe2);
2317 /* same function as the previous one, but check the interface */
2318 int gspca_dev_probe(struct usb_interface *intf,
2319 const struct usb_device_id *id,
2320 const struct sd_desc *sd_desc,
2322 struct module *module)
2324 struct usb_device *dev = interface_to_usbdev(intf);
2326 /* we don't handle multi-config cameras */
2327 if (dev->descriptor.bNumConfigurations != 1) {
2328 pr_err("%04x:%04x too many config\n",
2329 id->idVendor, id->idProduct);
2333 /* the USB video interface must be the first one */
2334 if (dev->actconfig->desc.bNumInterfaces != 1
2335 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2338 return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2340 EXPORT_SYMBOL(gspca_dev_probe);
2345 * This function must be called by the sub-driver
2346 * when the device disconnects, after the specific resources are freed.
2348 void gspca_disconnect(struct usb_interface *intf)
2350 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2351 #if IS_ENABLED(CONFIG_INPUT)
2352 struct input_dev *input_dev;
2355 PDEBUG(D_PROBE, "%s disconnect",
2356 video_device_node_name(&gspca_dev->vdev));
2358 mutex_lock(&gspca_dev->usb_lock);
2360 gspca_dev->present = 0;
2361 destroy_urbs(gspca_dev);
2363 #if IS_ENABLED(CONFIG_INPUT)
2364 gspca_input_destroy_urb(gspca_dev);
2365 input_dev = gspca_dev->input_dev;
2367 gspca_dev->input_dev = NULL;
2368 input_unregister_device(input_dev);
2371 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2372 if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2373 gspca_dev->sd_desc->stop0(gspca_dev);
2374 gspca_dev->streaming = 0;
2375 gspca_dev->dev = NULL;
2376 wake_up_interruptible(&gspca_dev->wq);
2378 v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2379 video_unregister_device(&gspca_dev->vdev);
2381 mutex_unlock(&gspca_dev->usb_lock);
2383 /* (this will call gspca_release() immediately or on last close) */
2384 v4l2_device_put(&gspca_dev->v4l2_dev);
2386 EXPORT_SYMBOL(gspca_disconnect);
2389 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2391 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2393 gspca_input_destroy_urb(gspca_dev);
2395 if (!gspca_dev->streaming)
2398 mutex_lock(&gspca_dev->usb_lock);
2399 gspca_dev->frozen = 1; /* avoid urb error messages */
2400 gspca_dev->usb_err = 0;
2401 if (gspca_dev->sd_desc->stopN)
2402 gspca_dev->sd_desc->stopN(gspca_dev);
2403 destroy_urbs(gspca_dev);
2404 gspca_set_alt0(gspca_dev);
2405 if (gspca_dev->sd_desc->stop0)
2406 gspca_dev->sd_desc->stop0(gspca_dev);
2407 mutex_unlock(&gspca_dev->usb_lock);
2411 EXPORT_SYMBOL(gspca_suspend);
2413 int gspca_resume(struct usb_interface *intf)
2415 struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2416 int streaming, ret = 0;
2418 mutex_lock(&gspca_dev->usb_lock);
2419 gspca_dev->frozen = 0;
2420 gspca_dev->usb_err = 0;
2421 gspca_dev->sd_desc->init(gspca_dev);
2423 * Most subdrivers send all ctrl values on sd_start and thus
2424 * only write to the device registers on s_ctrl when streaming ->
2425 * Clear streaming to avoid setting all ctrls twice.
2427 streaming = gspca_dev->streaming;
2428 gspca_dev->streaming = 0;
2430 ret = gspca_init_transfer(gspca_dev);
2432 gspca_input_create_urb(gspca_dev);
2433 mutex_unlock(&gspca_dev->usb_lock);
2437 EXPORT_SYMBOL(gspca_resume);
2440 /* -- module insert / remove -- */
2441 static int __init gspca_init(void)
2443 pr_info("v" GSPCA_VERSION " registered\n");
2446 static void __exit gspca_exit(void)
2450 module_init(gspca_init);
2451 module_exit(gspca_exit);
2454 module_param_named(debug, gspca_debug, int, 0644);
2455 MODULE_PARM_DESC(debug,
2456 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2457 " 0x08:stream 0x10:frame 0x20:packet"