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
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 #define GSPCA_VERSION "2.14.0"
24 #include <linux/init.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
34 #include <linux/uaccess.h>
35 #include <linux/ktime.h>
36 #include <media/v4l2-ioctl.h>
37 #include <media/v4l2-ctrls.h>
38 #include <media/v4l2-fh.h>
39 #include <media/v4l2-event.h>
43 #if IS_ENABLED(CONFIG_INPUT)
44 #include <linux/input.h>
45 #include <linux/usb/input.h>
49 #define DEF_NURBS 3 /* default number of URBs */
50 #if DEF_NURBS > MAX_NURBS
51 #error "DEF_NURBS too big"
54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
56 MODULE_LICENSE("GPL");
57 MODULE_VERSION(GSPCA_VERSION
);
60 EXPORT_SYMBOL(gspca_debug
);
62 static void PDEBUG_MODE(struct gspca_dev
*gspca_dev
, int debug
, char *txt
,
63 __u32 pixfmt
, int w
, int h
)
65 if ((pixfmt
>> 24) >= '0' && (pixfmt
>> 24) <= 'z') {
66 PDEBUG(debug
, "%s %c%c%c%c %dx%d",
70 (pixfmt
>> 16) & 0xff,
74 PDEBUG(debug
, "%s 0x%08x %dx%d",
81 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
82 #define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */
83 #define GSPCA_MEMORY_READ 7
85 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
90 static void gspca_vm_open(struct vm_area_struct
*vma
)
92 struct gspca_frame
*frame
= vma
->vm_private_data
;
94 frame
->vma_use_count
++;
95 frame
->v4l2_buf
.flags
|= V4L2_BUF_FLAG_MAPPED
;
98 static void gspca_vm_close(struct vm_area_struct
*vma
)
100 struct gspca_frame
*frame
= vma
->vm_private_data
;
102 if (--frame
->vma_use_count
<= 0)
103 frame
->v4l2_buf
.flags
&= ~V4L2_BUF_FLAG_MAPPED
;
106 static const struct vm_operations_struct gspca_vm_ops
= {
107 .open
= gspca_vm_open
,
108 .close
= gspca_vm_close
,
112 * Input and interrupt endpoint handling functions
114 #if IS_ENABLED(CONFIG_INPUT)
115 static void int_irq(struct urb
*urb
)
117 struct gspca_dev
*gspca_dev
= (struct gspca_dev
*) urb
->context
;
123 if (gspca_dev
->sd_desc
->int_pkt_scan(gspca_dev
,
124 urb
->transfer_buffer
, urb
->actual_length
) < 0) {
125 PERR("Unknown packet received");
133 /* Stop is requested either by software or hardware is gone,
134 * keep the ret value non-zero and don't resubmit later.
139 PERR("URB error %i, resubmitting", urb
->status
);
145 ret
= usb_submit_urb(urb
, GFP_ATOMIC
);
147 pr_err("Resubmit URB failed with error %i\n", ret
);
151 static int gspca_input_connect(struct gspca_dev
*dev
)
153 struct input_dev
*input_dev
;
156 dev
->input_dev
= NULL
;
157 if (dev
->sd_desc
->int_pkt_scan
|| dev
->sd_desc
->other_input
) {
158 input_dev
= input_allocate_device();
162 usb_make_path(dev
->dev
, dev
->phys
, sizeof(dev
->phys
));
163 strlcat(dev
->phys
, "/input0", sizeof(dev
->phys
));
165 input_dev
->name
= dev
->sd_desc
->name
;
166 input_dev
->phys
= dev
->phys
;
168 usb_to_input_id(dev
->dev
, &input_dev
->id
);
170 input_dev
->evbit
[0] = BIT_MASK(EV_KEY
);
171 input_dev
->keybit
[BIT_WORD(KEY_CAMERA
)] = BIT_MASK(KEY_CAMERA
);
172 input_dev
->dev
.parent
= &dev
->dev
->dev
;
174 err
= input_register_device(input_dev
);
176 pr_err("Input device registration failed with error %i\n",
178 input_dev
->dev
.parent
= NULL
;
179 input_free_device(input_dev
);
181 dev
->input_dev
= input_dev
;
188 static int alloc_and_submit_int_urb(struct gspca_dev
*gspca_dev
,
189 struct usb_endpoint_descriptor
*ep
)
191 unsigned int buffer_len
;
194 struct usb_device
*dev
;
198 buffer_len
= le16_to_cpu(ep
->wMaxPacketSize
);
199 interval
= ep
->bInterval
;
200 PDEBUG(D_CONF
, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u",
201 ep
->bEndpointAddress
, buffer_len
, interval
);
203 dev
= gspca_dev
->dev
;
205 urb
= usb_alloc_urb(0, GFP_KERNEL
);
211 buffer
= usb_alloc_coherent(dev
, buffer_len
,
212 GFP_KERNEL
, &urb
->transfer_dma
);
217 usb_fill_int_urb(urb
, dev
,
218 usb_rcvintpipe(dev
, ep
->bEndpointAddress
),
220 int_irq
, (void *)gspca_dev
, interval
);
221 urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
222 ret
= usb_submit_urb(urb
, GFP_KERNEL
);
224 PERR("submit int URB failed with error %i", ret
);
227 gspca_dev
->int_urb
= urb
;
231 usb_free_coherent(dev
,
232 urb
->transfer_buffer_length
,
233 urb
->transfer_buffer
,
241 static void gspca_input_create_urb(struct gspca_dev
*gspca_dev
)
243 struct usb_interface
*intf
;
244 struct usb_host_interface
*intf_desc
;
245 struct usb_endpoint_descriptor
*ep
;
248 if (gspca_dev
->sd_desc
->int_pkt_scan
) {
249 intf
= usb_ifnum_to_if(gspca_dev
->dev
, gspca_dev
->iface
);
250 intf_desc
= intf
->cur_altsetting
;
251 for (i
= 0; i
< intf_desc
->desc
.bNumEndpoints
; i
++) {
252 ep
= &intf_desc
->endpoint
[i
].desc
;
253 if (usb_endpoint_dir_in(ep
) &&
254 usb_endpoint_xfer_int(ep
)) {
256 alloc_and_submit_int_urb(gspca_dev
, ep
);
263 static void gspca_input_destroy_urb(struct gspca_dev
*gspca_dev
)
267 urb
= gspca_dev
->int_urb
;
269 gspca_dev
->int_urb
= NULL
;
271 usb_free_coherent(gspca_dev
->dev
,
272 urb
->transfer_buffer_length
,
273 urb
->transfer_buffer
,
279 static inline void gspca_input_destroy_urb(struct gspca_dev
*gspca_dev
)
283 static inline void gspca_input_create_urb(struct gspca_dev
*gspca_dev
)
287 static inline int gspca_input_connect(struct gspca_dev
*dev
)
294 * fill a video frame from an URB and resubmit
296 static void fill_frame(struct gspca_dev
*gspca_dev
,
299 u8
*data
; /* address of data in the iso message */
303 if (urb
->status
!= 0) {
304 if (urb
->status
== -ESHUTDOWN
)
305 return; /* disconnection */
307 if (gspca_dev
->frozen
)
310 PERR("urb status: %d", urb
->status
);
314 pkt_scan
= gspca_dev
->sd_desc
->pkt_scan
;
315 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
316 len
= urb
->iso_frame_desc
[i
].actual_length
;
318 /* check the packet status and length */
319 st
= urb
->iso_frame_desc
[i
].status
;
321 pr_err("ISOC data error: [%d] len=%d, status=%d\n",
323 gspca_dev
->last_packet_type
= DISCARD_PACKET
;
327 if (gspca_dev
->empty_packet
== 0)
328 gspca_dev
->empty_packet
= 1;
332 /* let the packet be analyzed by the subdriver */
333 PDEBUG(D_PACK
, "packet [%d] o:%d l:%d",
334 i
, urb
->iso_frame_desc
[i
].offset
, len
);
335 data
= (u8
*) urb
->transfer_buffer
336 + urb
->iso_frame_desc
[i
].offset
;
337 pkt_scan(gspca_dev
, data
, len
);
341 /* resubmit the URB */
342 st
= usb_submit_urb(urb
, GFP_ATOMIC
);
344 pr_err("usb_submit_urb() ret %d\n", st
);
348 * ISOC message interrupt from the USB device
350 * Analyse each packet and call the subdriver for copy to the frame buffer.
352 static void isoc_irq(struct urb
*urb
)
354 struct gspca_dev
*gspca_dev
= (struct gspca_dev
*) urb
->context
;
356 PDEBUG(D_PACK
, "isoc irq");
357 if (!gspca_dev
->streaming
)
359 fill_frame(gspca_dev
, urb
);
363 * bulk message interrupt from the USB device
365 static void bulk_irq(struct urb
*urb
)
367 struct gspca_dev
*gspca_dev
= (struct gspca_dev
*) urb
->context
;
370 PDEBUG(D_PACK
, "bulk irq");
371 if (!gspca_dev
->streaming
)
373 switch (urb
->status
) {
377 return; /* disconnection */
380 if (gspca_dev
->frozen
)
383 PERR("urb status: %d", urb
->status
);
388 PDEBUG(D_PACK
, "packet l:%d", urb
->actual_length
);
389 gspca_dev
->sd_desc
->pkt_scan(gspca_dev
,
390 urb
->transfer_buffer
,
394 /* resubmit the URB */
395 if (gspca_dev
->cam
.bulk_nurbs
!= 0) {
396 st
= usb_submit_urb(urb
, GFP_ATOMIC
);
398 pr_err("usb_submit_urb() ret %d\n", st
);
403 * add data to the current frame
405 * This function is called by the subdrivers at interrupt level.
407 * To build a frame, these ones must add
409 * - 0 or many INTER_PACKETs
411 * DISCARD_PACKET invalidates the whole frame.
413 void gspca_frame_add(struct gspca_dev
*gspca_dev
,
414 enum gspca_packet_type packet_type
,
418 struct gspca_frame
*frame
;
421 PDEBUG(D_PACK
, "add t:%d l:%d", packet_type
, len
);
423 if (packet_type
== FIRST_PACKET
) {
424 i
= atomic_read(&gspca_dev
->fr_i
);
426 /* if there are no queued buffer, discard the whole frame */
427 if (i
== atomic_read(&gspca_dev
->fr_q
)) {
428 gspca_dev
->last_packet_type
= DISCARD_PACKET
;
429 gspca_dev
->sequence
++;
432 j
= gspca_dev
->fr_queue
[i
];
433 frame
= &gspca_dev
->frame
[j
];
434 v4l2_get_timestamp(&frame
->v4l2_buf
.timestamp
);
435 frame
->v4l2_buf
.sequence
= gspca_dev
->sequence
++;
436 gspca_dev
->image
= frame
->data
;
437 gspca_dev
->image_len
= 0;
439 switch (gspca_dev
->last_packet_type
) {
441 if (packet_type
== LAST_PACKET
) {
442 gspca_dev
->last_packet_type
= packet_type
;
443 gspca_dev
->image
= NULL
;
444 gspca_dev
->image_len
= 0;
452 /* append the packet to the frame buffer */
454 if (gspca_dev
->image_len
+ len
> gspca_dev
->frsz
) {
455 PERR("frame overflow %d > %d",
456 gspca_dev
->image_len
+ len
,
458 packet_type
= DISCARD_PACKET
;
460 /* !! image is NULL only when last pkt is LAST or DISCARD
461 if (gspca_dev->image == NULL) {
462 pr_err("gspca_frame_add() image == NULL\n");
466 memcpy(gspca_dev
->image
+ gspca_dev
->image_len
,
468 gspca_dev
->image_len
+= len
;
471 gspca_dev
->last_packet_type
= packet_type
;
473 /* if last packet, invalidate packet concatenation until
474 * next first packet, wake up the application and advance
476 if (packet_type
== LAST_PACKET
) {
477 i
= atomic_read(&gspca_dev
->fr_i
);
478 j
= gspca_dev
->fr_queue
[i
];
479 frame
= &gspca_dev
->frame
[j
];
480 frame
->v4l2_buf
.bytesused
= gspca_dev
->image_len
;
481 frame
->v4l2_buf
.flags
= (frame
->v4l2_buf
.flags
482 | V4L2_BUF_FLAG_DONE
)
483 & ~V4L2_BUF_FLAG_QUEUED
;
484 i
= (i
+ 1) % GSPCA_MAX_FRAMES
;
485 atomic_set(&gspca_dev
->fr_i
, i
);
486 wake_up_interruptible(&gspca_dev
->wq
); /* event = new frame */
487 PDEBUG(D_FRAM
, "frame complete len:%d",
488 frame
->v4l2_buf
.bytesused
);
489 gspca_dev
->image
= NULL
;
490 gspca_dev
->image_len
= 0;
493 EXPORT_SYMBOL(gspca_frame_add
);
495 static int frame_alloc(struct gspca_dev
*gspca_dev
, struct file
*file
,
496 enum v4l2_memory memory
, unsigned int count
)
498 struct gspca_frame
*frame
;
502 frsz
= gspca_dev
->pixfmt
.sizeimage
;
503 PDEBUG(D_STREAM
, "frame alloc frsz: %d", frsz
);
504 frsz
= PAGE_ALIGN(frsz
);
505 if (count
>= GSPCA_MAX_FRAMES
)
506 count
= GSPCA_MAX_FRAMES
- 1;
507 gspca_dev
->frbuf
= vmalloc_32(frsz
* count
);
508 if (!gspca_dev
->frbuf
) {
509 pr_err("frame alloc failed\n");
512 gspca_dev
->capt_file
= file
;
513 gspca_dev
->memory
= memory
;
514 gspca_dev
->frsz
= frsz
;
515 gspca_dev
->nframes
= count
;
516 for (i
= 0; i
< count
; i
++) {
517 frame
= &gspca_dev
->frame
[i
];
518 frame
->v4l2_buf
.index
= i
;
519 frame
->v4l2_buf
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
520 frame
->v4l2_buf
.flags
= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
;
521 frame
->v4l2_buf
.field
= V4L2_FIELD_NONE
;
522 frame
->v4l2_buf
.length
= frsz
;
523 frame
->v4l2_buf
.memory
= memory
;
524 frame
->v4l2_buf
.sequence
= 0;
525 frame
->data
= gspca_dev
->frbuf
+ i
* frsz
;
526 frame
->v4l2_buf
.m
.offset
= i
* frsz
;
528 atomic_set(&gspca_dev
->fr_q
, 0);
529 atomic_set(&gspca_dev
->fr_i
, 0);
534 static void frame_free(struct gspca_dev
*gspca_dev
)
538 PDEBUG(D_STREAM
, "frame free");
539 if (gspca_dev
->frbuf
!= NULL
) {
540 vfree(gspca_dev
->frbuf
);
541 gspca_dev
->frbuf
= NULL
;
542 for (i
= 0; i
< gspca_dev
->nframes
; i
++)
543 gspca_dev
->frame
[i
].data
= NULL
;
545 gspca_dev
->nframes
= 0;
547 gspca_dev
->capt_file
= NULL
;
548 gspca_dev
->memory
= GSPCA_MEMORY_NO
;
551 static void destroy_urbs(struct gspca_dev
*gspca_dev
)
556 PDEBUG(D_STREAM
, "kill transfer");
557 for (i
= 0; i
< MAX_NURBS
; i
++) {
558 urb
= gspca_dev
->urb
[i
];
562 gspca_dev
->urb
[i
] = NULL
;
564 usb_free_coherent(gspca_dev
->dev
,
565 urb
->transfer_buffer_length
,
566 urb
->transfer_buffer
,
572 static int gspca_set_alt0(struct gspca_dev
*gspca_dev
)
576 if (gspca_dev
->alt
== 0)
578 ret
= usb_set_interface(gspca_dev
->dev
, gspca_dev
->iface
, 0);
580 pr_err("set alt 0 err %d\n", ret
);
584 /* Note: both the queue and the usb locks should be held when calling this */
585 static void gspca_stream_off(struct gspca_dev
*gspca_dev
)
587 gspca_dev
->streaming
= 0;
588 gspca_dev
->usb_err
= 0;
589 if (gspca_dev
->sd_desc
->stopN
)
590 gspca_dev
->sd_desc
->stopN(gspca_dev
);
591 destroy_urbs(gspca_dev
);
592 gspca_input_destroy_urb(gspca_dev
);
593 gspca_set_alt0(gspca_dev
);
594 gspca_input_create_urb(gspca_dev
);
595 if (gspca_dev
->sd_desc
->stop0
)
596 gspca_dev
->sd_desc
->stop0(gspca_dev
);
597 PDEBUG(D_STREAM
, "stream off OK");
601 * look for an input transfer endpoint in an alternate setting.
603 * If xfer_ep is invalid, return the first valid ep found, otherwise
604 * look for exactly the ep with address equal to xfer_ep.
606 static struct usb_host_endpoint
*alt_xfer(struct usb_host_interface
*alt
,
607 int xfer
, int xfer_ep
)
609 struct usb_host_endpoint
*ep
;
612 for (i
= 0; i
< alt
->desc
.bNumEndpoints
; i
++) {
613 ep
= &alt
->endpoint
[i
];
614 attr
= ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
;
616 && ep
->desc
.wMaxPacketSize
!= 0
617 && usb_endpoint_dir_in(&ep
->desc
)
618 && (xfer_ep
< 0 || ep
->desc
.bEndpointAddress
== xfer_ep
))
624 /* compute the minimum bandwidth for the current transfer */
625 static u32
which_bandwidth(struct gspca_dev
*gspca_dev
)
629 /* get the (max) image size */
630 bandwidth
= gspca_dev
->pixfmt
.sizeimage
;
632 /* if the image is compressed, estimate its mean size */
633 if (!gspca_dev
->cam
.needs_full_bandwidth
&&
634 bandwidth
< gspca_dev
->pixfmt
.width
*
635 gspca_dev
->pixfmt
.height
)
636 bandwidth
= bandwidth
* 3 / 8; /* 0.375 */
638 /* estimate the frame rate */
639 if (gspca_dev
->sd_desc
->get_streamparm
) {
640 struct v4l2_streamparm parm
;
642 gspca_dev
->sd_desc
->get_streamparm(gspca_dev
, &parm
);
643 bandwidth
*= parm
.parm
.capture
.timeperframe
.denominator
;
644 bandwidth
/= parm
.parm
.capture
.timeperframe
.numerator
;
647 /* don't hope more than 15 fps with USB 1.1 and
648 * image resolution >= 640x480 */
649 if (gspca_dev
->pixfmt
.width
>= 640
650 && gspca_dev
->dev
->speed
== USB_SPEED_FULL
)
651 bandwidth
*= 15; /* 15 fps */
653 bandwidth
*= 30; /* 30 fps */
656 PDEBUG(D_STREAM
, "min bandwidth: %d", bandwidth
);
668 * build the table of the endpoints
669 * and compute the minimum bandwidth for the image transfer
671 static int build_isoc_ep_tb(struct gspca_dev
*gspca_dev
,
672 struct usb_interface
*intf
,
673 struct ep_tb_s
*ep_tb
)
675 struct usb_host_endpoint
*ep
;
676 int i
, j
, nbalt
, psize
, found
;
677 u32 bandwidth
, last_bw
;
679 nbalt
= intf
->num_altsetting
;
681 nbalt
= MAX_ALT
; /* fixme: should warn */
683 /* build the endpoint table */
687 ep_tb
->bandwidth
= 2000 * 2000 * 120;
689 for (j
= 0; j
< nbalt
; j
++) {
690 ep
= alt_xfer(&intf
->altsetting
[j
],
691 USB_ENDPOINT_XFER_ISOC
,
695 if (ep
->desc
.bInterval
== 0) {
696 pr_err("alt %d iso endp with 0 interval\n", j
);
699 psize
= le16_to_cpu(ep
->desc
.wMaxPacketSize
);
700 psize
= (psize
& 0x07ff) * (1 + ((psize
>> 11) & 3));
701 bandwidth
= psize
* 1000;
702 if (gspca_dev
->dev
->speed
== USB_SPEED_HIGH
703 || gspca_dev
->dev
->speed
>= USB_SPEED_SUPER
)
705 bandwidth
/= 1 << (ep
->desc
.bInterval
- 1);
706 if (bandwidth
<= last_bw
)
708 if (bandwidth
< ep_tb
->bandwidth
) {
709 ep_tb
->bandwidth
= bandwidth
;
716 PDEBUG(D_STREAM
, "alt %d bandwidth %d",
717 ep_tb
->alt
, ep_tb
->bandwidth
);
718 last_bw
= ep_tb
->bandwidth
;
725 * has a usb audio class interface (a built in usb mic); and
726 * is a usb 1 full speed device; and
727 * uses the max full speed iso bandwidth; and
728 * and has more than 1 alt setting
729 * then skip the highest alt setting to spare bandwidth for the mic
731 if (gspca_dev
->audio
&&
732 gspca_dev
->dev
->speed
== USB_SPEED_FULL
&&
733 last_bw
>= 1000000 &&
735 PDEBUG(D_STREAM
, "dev has usb audio, skipping highest alt");
740 /* get the requested bandwidth and start at the highest atlsetting */
741 bandwidth
= which_bandwidth(gspca_dev
);
745 if (ep_tb
->bandwidth
< bandwidth
)
753 * create the URBs for image transfer
755 static int create_urbs(struct gspca_dev
*gspca_dev
,
756 struct usb_host_endpoint
*ep
)
759 int n
, nurbs
, i
, psize
, npkt
, bsize
;
761 /* calculate the packet size and the number of packets */
762 psize
= le16_to_cpu(ep
->desc
.wMaxPacketSize
);
764 if (!gspca_dev
->cam
.bulk
) { /* isoc */
766 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
767 if (gspca_dev
->pkt_size
== 0)
768 psize
= (psize
& 0x07ff) * (1 + ((psize
>> 11) & 3));
770 psize
= gspca_dev
->pkt_size
;
771 npkt
= gspca_dev
->cam
.npkt
;
773 npkt
= 32; /* default value */
774 bsize
= psize
* npkt
;
776 "isoc %d pkts size %d = bsize:%d",
781 bsize
= gspca_dev
->cam
.bulk_size
;
784 PDEBUG(D_STREAM
, "bulk bsize:%d", bsize
);
785 if (gspca_dev
->cam
.bulk_nurbs
!= 0)
786 nurbs
= gspca_dev
->cam
.bulk_nurbs
;
791 for (n
= 0; n
< nurbs
; n
++) {
792 urb
= usb_alloc_urb(npkt
, GFP_KERNEL
);
795 gspca_dev
->urb
[n
] = urb
;
796 urb
->transfer_buffer
= usb_alloc_coherent(gspca_dev
->dev
,
801 if (urb
->transfer_buffer
== NULL
) {
802 pr_err("usb_alloc_coherent failed\n");
805 urb
->dev
= gspca_dev
->dev
;
806 urb
->context
= gspca_dev
;
807 urb
->transfer_buffer_length
= bsize
;
808 if (npkt
!= 0) { /* ISOC */
809 urb
->pipe
= usb_rcvisocpipe(gspca_dev
->dev
,
810 ep
->desc
.bEndpointAddress
);
811 urb
->transfer_flags
= URB_ISO_ASAP
812 | URB_NO_TRANSFER_DMA_MAP
;
813 urb
->interval
= 1 << (ep
->desc
.bInterval
- 1);
814 urb
->complete
= isoc_irq
;
815 urb
->number_of_packets
= npkt
;
816 for (i
= 0; i
< npkt
; i
++) {
817 urb
->iso_frame_desc
[i
].length
= psize
;
818 urb
->iso_frame_desc
[i
].offset
= psize
* i
;
821 urb
->pipe
= usb_rcvbulkpipe(gspca_dev
->dev
,
822 ep
->desc
.bEndpointAddress
);
823 urb
->transfer_flags
= URB_NO_TRANSFER_DMA_MAP
;
824 urb
->complete
= bulk_irq
;
831 * start the USB transfer
833 static int gspca_init_transfer(struct gspca_dev
*gspca_dev
)
835 struct usb_interface
*intf
;
836 struct usb_host_endpoint
*ep
;
838 struct ep_tb_s ep_tb
[MAX_ALT
];
839 int n
, ret
, xfer
, alt
, alt_idx
;
841 /* reset the streaming variables */
842 gspca_dev
->image
= NULL
;
843 gspca_dev
->image_len
= 0;
844 gspca_dev
->last_packet_type
= DISCARD_PACKET
;
845 gspca_dev
->sequence
= 0;
847 gspca_dev
->usb_err
= 0;
849 /* do the specific subdriver stuff before endpoint selection */
850 intf
= usb_ifnum_to_if(gspca_dev
->dev
, gspca_dev
->iface
);
851 gspca_dev
->alt
= gspca_dev
->cam
.bulk
? intf
->num_altsetting
: 0;
852 if (gspca_dev
->sd_desc
->isoc_init
) {
853 ret
= gspca_dev
->sd_desc
->isoc_init(gspca_dev
);
857 xfer
= gspca_dev
->cam
.bulk
? USB_ENDPOINT_XFER_BULK
858 : USB_ENDPOINT_XFER_ISOC
;
860 /* if bulk or the subdriver forced an altsetting, get the endpoint */
861 if (gspca_dev
->alt
!= 0) {
862 gspca_dev
->alt
--; /* (previous version compatibility) */
863 ep
= alt_xfer(&intf
->altsetting
[gspca_dev
->alt
], xfer
,
866 pr_err("bad altsetting %d\n", gspca_dev
->alt
);
869 ep_tb
[0].alt
= gspca_dev
->alt
;
872 /* else, compute the minimum bandwidth
873 * and build the endpoint table */
874 alt_idx
= build_isoc_ep_tb(gspca_dev
, intf
, ep_tb
);
876 pr_err("no transfer endpoint found\n");
881 /* set the highest alternate setting and
882 * loop until urb submit succeeds */
883 gspca_input_destroy_urb(gspca_dev
);
885 gspca_dev
->alt
= ep_tb
[--alt_idx
].alt
;
888 if (alt
!= gspca_dev
->alt
) {
889 alt
= gspca_dev
->alt
;
890 if (intf
->num_altsetting
> 1) {
891 ret
= usb_set_interface(gspca_dev
->dev
,
896 goto retry
; /*fixme: ugly*/
897 pr_err("set alt %d err %d\n", alt
, ret
);
902 if (!gspca_dev
->cam
.no_urb_create
) {
903 PDEBUG(D_STREAM
, "init transfer alt %d", alt
);
904 ret
= create_urbs(gspca_dev
,
905 alt_xfer(&intf
->altsetting
[alt
], xfer
,
906 gspca_dev
->xfer_ep
));
908 destroy_urbs(gspca_dev
);
913 /* clear the bulk endpoint */
914 if (gspca_dev
->cam
.bulk
)
915 usb_clear_halt(gspca_dev
->dev
,
916 gspca_dev
->urb
[0]->pipe
);
919 ret
= gspca_dev
->sd_desc
->start(gspca_dev
);
921 destroy_urbs(gspca_dev
);
924 gspca_dev
->streaming
= 1;
925 v4l2_ctrl_handler_setup(gspca_dev
->vdev
.ctrl_handler
);
927 /* some bulk transfers are started by the subdriver */
928 if (gspca_dev
->cam
.bulk
&& gspca_dev
->cam
.bulk_nurbs
== 0)
931 /* submit the URBs */
932 for (n
= 0; n
< MAX_NURBS
; n
++) {
933 urb
= gspca_dev
->urb
[n
];
936 ret
= usb_submit_urb(urb
, GFP_KERNEL
);
941 break; /* transfer is started */
943 /* something when wrong
944 * stop the webcam and free the transfer resources */
945 gspca_stream_off(gspca_dev
);
946 if (ret
!= -ENOSPC
) {
947 pr_err("usb_submit_urb alt %d err %d\n",
948 gspca_dev
->alt
, ret
);
952 /* the bandwidth is not wide enough
953 * negotiate or try a lower alternate setting */
955 PERR("alt %d - bandwidth not wide enough, trying again", alt
);
956 msleep(20); /* wait for kill complete */
957 if (gspca_dev
->sd_desc
->isoc_nego
) {
958 ret
= gspca_dev
->sd_desc
->isoc_nego(gspca_dev
);
963 pr_err("no transfer endpoint found\n");
967 gspca_dev
->alt
= ep_tb
[--alt_idx
].alt
;
971 gspca_input_create_urb(gspca_dev
);
975 static void gspca_set_default_mode(struct gspca_dev
*gspca_dev
)
979 i
= gspca_dev
->cam
.nmodes
- 1; /* take the highest mode */
980 gspca_dev
->curr_mode
= i
;
981 gspca_dev
->pixfmt
= gspca_dev
->cam
.cam_mode
[i
];
983 /* does nothing if ctrl_handler == NULL */
984 v4l2_ctrl_handler_setup(gspca_dev
->vdev
.ctrl_handler
);
987 static int wxh_to_mode(struct gspca_dev
*gspca_dev
,
988 int width
, int height
)
992 for (i
= 0; i
< gspca_dev
->cam
.nmodes
; i
++) {
993 if (width
== gspca_dev
->cam
.cam_mode
[i
].width
994 && height
== gspca_dev
->cam
.cam_mode
[i
].height
)
1000 static int wxh_to_nearest_mode(struct gspca_dev
*gspca_dev
,
1001 int width
, int height
)
1005 for (i
= gspca_dev
->cam
.nmodes
; --i
> 0; ) {
1006 if (width
>= gspca_dev
->cam
.cam_mode
[i
].width
1007 && height
>= gspca_dev
->cam
.cam_mode
[i
].height
)
1014 * search a mode with the right pixel format
1016 static int gspca_get_mode(struct gspca_dev
*gspca_dev
,
1022 modeU
= modeD
= mode
;
1023 while ((modeU
< gspca_dev
->cam
.nmodes
) || modeD
>= 0) {
1025 if (gspca_dev
->cam
.cam_mode
[modeD
].pixelformat
1029 if (++modeU
< gspca_dev
->cam
.nmodes
) {
1030 if (gspca_dev
->cam
.cam_mode
[modeU
].pixelformat
1038 #ifdef CONFIG_VIDEO_ADV_DEBUG
1039 static int vidioc_g_chip_info(struct file
*file
, void *priv
,
1040 struct v4l2_dbg_chip_info
*chip
)
1042 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1044 gspca_dev
->usb_err
= 0;
1045 if (gspca_dev
->sd_desc
->get_chip_info
)
1046 return gspca_dev
->sd_desc
->get_chip_info(gspca_dev
, chip
);
1047 return chip
->match
.addr
? -EINVAL
: 0;
1050 static int vidioc_g_register(struct file
*file
, void *priv
,
1051 struct v4l2_dbg_register
*reg
)
1053 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1055 gspca_dev
->usb_err
= 0;
1056 return gspca_dev
->sd_desc
->get_register(gspca_dev
, reg
);
1059 static int vidioc_s_register(struct file
*file
, void *priv
,
1060 const struct v4l2_dbg_register
*reg
)
1062 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1064 gspca_dev
->usb_err
= 0;
1065 return gspca_dev
->sd_desc
->set_register(gspca_dev
, reg
);
1069 static int vidioc_enum_fmt_vid_cap(struct file
*file
, void *priv
,
1070 struct v4l2_fmtdesc
*fmtdesc
)
1072 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1076 /* give an index to each format */
1078 for (i
= gspca_dev
->cam
.nmodes
; --i
>= 0; ) {
1079 fmt_tb
[index
] = gspca_dev
->cam
.cam_mode
[i
].pixelformat
;
1082 if (fmt_tb
[j
] == fmt_tb
[index
])
1087 if (fmtdesc
->index
== index
)
1088 break; /* new format */
1090 if (index
>= ARRAY_SIZE(fmt_tb
))
1095 return -EINVAL
; /* no more format */
1097 fmtdesc
->pixelformat
= fmt_tb
[index
];
1098 if (gspca_dev
->cam
.cam_mode
[i
].sizeimage
<
1099 gspca_dev
->cam
.cam_mode
[i
].width
*
1100 gspca_dev
->cam
.cam_mode
[i
].height
)
1101 fmtdesc
->flags
= V4L2_FMT_FLAG_COMPRESSED
;
1102 fmtdesc
->description
[0] = fmtdesc
->pixelformat
& 0xff;
1103 fmtdesc
->description
[1] = (fmtdesc
->pixelformat
>> 8) & 0xff;
1104 fmtdesc
->description
[2] = (fmtdesc
->pixelformat
>> 16) & 0xff;
1105 fmtdesc
->description
[3] = fmtdesc
->pixelformat
>> 24;
1106 fmtdesc
->description
[4] = '\0';
1110 static int vidioc_g_fmt_vid_cap(struct file
*file
, void *priv
,
1111 struct v4l2_format
*fmt
)
1113 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1115 fmt
->fmt
.pix
= gspca_dev
->pixfmt
;
1116 /* some drivers use priv internally, zero it before giving it back to
1118 fmt
->fmt
.pix
.priv
= 0;
1122 static int try_fmt_vid_cap(struct gspca_dev
*gspca_dev
,
1123 struct v4l2_format
*fmt
)
1125 int w
, h
, mode
, mode2
;
1127 w
= fmt
->fmt
.pix
.width
;
1128 h
= fmt
->fmt
.pix
.height
;
1130 PDEBUG_MODE(gspca_dev
, D_CONF
, "try fmt cap",
1131 fmt
->fmt
.pix
.pixelformat
, w
, h
);
1133 /* search the nearest mode for width and height */
1134 mode
= wxh_to_nearest_mode(gspca_dev
, w
, h
);
1136 /* OK if right palette */
1137 if (gspca_dev
->cam
.cam_mode
[mode
].pixelformat
1138 != fmt
->fmt
.pix
.pixelformat
) {
1140 /* else, search the closest mode with the same pixel format */
1141 mode2
= gspca_get_mode(gspca_dev
, mode
,
1142 fmt
->fmt
.pix
.pixelformat
);
1146 fmt
->fmt
.pix
= gspca_dev
->cam
.cam_mode
[mode
];
1147 if (gspca_dev
->sd_desc
->try_fmt
) {
1148 /* pass original resolution to subdriver try_fmt */
1149 fmt
->fmt
.pix
.width
= w
;
1150 fmt
->fmt
.pix
.height
= h
;
1151 gspca_dev
->sd_desc
->try_fmt(gspca_dev
, fmt
);
1153 /* some drivers use priv internally, zero it before giving it back to
1155 fmt
->fmt
.pix
.priv
= 0;
1156 return mode
; /* used when s_fmt */
1159 static int vidioc_try_fmt_vid_cap(struct file
*file
,
1161 struct v4l2_format
*fmt
)
1163 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1166 ret
= try_fmt_vid_cap(gspca_dev
, fmt
);
1172 static int vidioc_s_fmt_vid_cap(struct file
*file
, void *priv
,
1173 struct v4l2_format
*fmt
)
1175 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1178 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1179 return -ERESTARTSYS
;
1181 ret
= try_fmt_vid_cap(gspca_dev
, fmt
);
1185 if (gspca_dev
->nframes
!= 0
1186 && fmt
->fmt
.pix
.sizeimage
> gspca_dev
->frsz
) {
1191 if (gspca_dev
->streaming
) {
1195 gspca_dev
->curr_mode
= ret
;
1196 if (gspca_dev
->sd_desc
->try_fmt
)
1197 /* subdriver try_fmt can modify format parameters */
1198 gspca_dev
->pixfmt
= fmt
->fmt
.pix
;
1200 gspca_dev
->pixfmt
= gspca_dev
->cam
.cam_mode
[ret
];
1204 mutex_unlock(&gspca_dev
->queue_lock
);
1208 static int vidioc_enum_framesizes(struct file
*file
, void *priv
,
1209 struct v4l2_frmsizeenum
*fsize
)
1211 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1215 if (gspca_dev
->sd_desc
->enum_framesizes
)
1216 return gspca_dev
->sd_desc
->enum_framesizes(gspca_dev
, fsize
);
1218 for (i
= 0; i
< gspca_dev
->cam
.nmodes
; i
++) {
1219 if (fsize
->pixel_format
!=
1220 gspca_dev
->cam
.cam_mode
[i
].pixelformat
)
1223 if (fsize
->index
== index
) {
1224 fsize
->type
= V4L2_FRMSIZE_TYPE_DISCRETE
;
1225 fsize
->discrete
.width
=
1226 gspca_dev
->cam
.cam_mode
[i
].width
;
1227 fsize
->discrete
.height
=
1228 gspca_dev
->cam
.cam_mode
[i
].height
;
1237 static int vidioc_enum_frameintervals(struct file
*filp
, void *priv
,
1238 struct v4l2_frmivalenum
*fival
)
1240 struct gspca_dev
*gspca_dev
= video_drvdata(filp
);
1244 mode
= wxh_to_mode(gspca_dev
, fival
->width
, fival
->height
);
1248 if (gspca_dev
->cam
.mode_framerates
== NULL
||
1249 gspca_dev
->cam
.mode_framerates
[mode
].nrates
== 0)
1252 if (fival
->pixel_format
!=
1253 gspca_dev
->cam
.cam_mode
[mode
].pixelformat
)
1256 for (i
= 0; i
< gspca_dev
->cam
.mode_framerates
[mode
].nrates
; i
++) {
1257 if (fival
->index
== i
) {
1258 fival
->type
= V4L2_FRMIVAL_TYPE_DISCRETE
;
1259 fival
->discrete
.numerator
= 1;
1260 fival
->discrete
.denominator
=
1261 gspca_dev
->cam
.mode_framerates
[mode
].rates
[i
];
1269 static void gspca_release(struct v4l2_device
*v4l2_device
)
1271 struct gspca_dev
*gspca_dev
=
1272 container_of(v4l2_device
, struct gspca_dev
, v4l2_dev
);
1274 v4l2_ctrl_handler_free(gspca_dev
->vdev
.ctrl_handler
);
1275 v4l2_device_unregister(&gspca_dev
->v4l2_dev
);
1276 kfree(gspca_dev
->usb_buf
);
1280 static int dev_open(struct file
*file
)
1282 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1285 PDEBUG(D_STREAM
, "[%s] open", current
->comm
);
1287 /* protect the subdriver against rmmod */
1288 if (!try_module_get(gspca_dev
->module
))
1291 ret
= v4l2_fh_open(file
);
1293 module_put(gspca_dev
->module
);
1297 static int dev_close(struct file
*file
)
1299 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1301 PDEBUG(D_STREAM
, "[%s] close", current
->comm
);
1303 /* Needed for gspca_stream_off, always lock before queue_lock! */
1304 if (mutex_lock_interruptible(&gspca_dev
->usb_lock
))
1305 return -ERESTARTSYS
;
1307 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
)) {
1308 mutex_unlock(&gspca_dev
->usb_lock
);
1309 return -ERESTARTSYS
;
1312 /* if the file did the capture, free the streaming resources */
1313 if (gspca_dev
->capt_file
== file
) {
1314 if (gspca_dev
->streaming
)
1315 gspca_stream_off(gspca_dev
);
1316 frame_free(gspca_dev
);
1318 module_put(gspca_dev
->module
);
1319 mutex_unlock(&gspca_dev
->queue_lock
);
1320 mutex_unlock(&gspca_dev
->usb_lock
);
1322 PDEBUG(D_STREAM
, "close done");
1324 return v4l2_fh_release(file
);
1327 static int vidioc_querycap(struct file
*file
, void *priv
,
1328 struct v4l2_capability
*cap
)
1330 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1332 strlcpy((char *) cap
->driver
, gspca_dev
->sd_desc
->name
,
1333 sizeof cap
->driver
);
1334 if (gspca_dev
->dev
->product
!= NULL
) {
1335 strlcpy((char *) cap
->card
, gspca_dev
->dev
->product
,
1338 snprintf((char *) cap
->card
, sizeof cap
->card
,
1339 "USB Camera (%04x:%04x)",
1340 le16_to_cpu(gspca_dev
->dev
->descriptor
.idVendor
),
1341 le16_to_cpu(gspca_dev
->dev
->descriptor
.idProduct
));
1343 usb_make_path(gspca_dev
->dev
, (char *) cap
->bus_info
,
1344 sizeof(cap
->bus_info
));
1345 cap
->device_caps
= V4L2_CAP_VIDEO_CAPTURE
1346 | V4L2_CAP_STREAMING
1347 | V4L2_CAP_READWRITE
;
1348 cap
->capabilities
= cap
->device_caps
| V4L2_CAP_DEVICE_CAPS
;
1352 static int vidioc_enum_input(struct file
*file
, void *priv
,
1353 struct v4l2_input
*input
)
1355 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1357 if (input
->index
!= 0)
1359 input
->type
= V4L2_INPUT_TYPE_CAMERA
;
1360 input
->status
= gspca_dev
->cam
.input_flags
;
1361 strlcpy(input
->name
, gspca_dev
->sd_desc
->name
,
1362 sizeof input
->name
);
1366 static int vidioc_g_input(struct file
*file
, void *priv
, unsigned int *i
)
1372 static int vidioc_s_input(struct file
*file
, void *priv
, unsigned int i
)
1379 static int vidioc_reqbufs(struct file
*file
, void *priv
,
1380 struct v4l2_requestbuffers
*rb
)
1382 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1383 int i
, ret
= 0, streaming
;
1385 i
= rb
->memory
; /* (avoid compilation warning) */
1387 case GSPCA_MEMORY_READ
: /* (internal call) */
1388 case V4L2_MEMORY_MMAP
:
1389 case V4L2_MEMORY_USERPTR
:
1394 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1395 return -ERESTARTSYS
;
1397 if (gspca_dev
->memory
!= GSPCA_MEMORY_NO
1398 && gspca_dev
->memory
!= GSPCA_MEMORY_READ
1399 && gspca_dev
->memory
!= rb
->memory
) {
1404 /* only one file may do the capture */
1405 if (gspca_dev
->capt_file
!= NULL
1406 && gspca_dev
->capt_file
!= file
) {
1411 /* if allocated, the buffers must not be mapped */
1412 for (i
= 0; i
< gspca_dev
->nframes
; i
++) {
1413 if (gspca_dev
->frame
[i
].vma_use_count
) {
1419 /* stop streaming */
1420 streaming
= gspca_dev
->streaming
;
1422 gspca_stream_off(gspca_dev
);
1424 /* Don't restart the stream when switching from read
1426 if (gspca_dev
->memory
== GSPCA_MEMORY_READ
)
1430 /* free the previous allocated buffers, if any */
1431 if (gspca_dev
->nframes
!= 0)
1432 frame_free(gspca_dev
);
1433 if (rb
->count
== 0) /* unrequest */
1435 ret
= frame_alloc(gspca_dev
, file
, rb
->memory
, rb
->count
);
1437 rb
->count
= gspca_dev
->nframes
;
1439 ret
= gspca_init_transfer(gspca_dev
);
1442 mutex_unlock(&gspca_dev
->queue_lock
);
1443 PDEBUG(D_STREAM
, "reqbufs st:%d c:%d", ret
, rb
->count
);
1447 static int vidioc_querybuf(struct file
*file
, void *priv
,
1448 struct v4l2_buffer
*v4l2_buf
)
1450 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1451 struct gspca_frame
*frame
;
1453 if (v4l2_buf
->index
>= gspca_dev
->nframes
)
1456 frame
= &gspca_dev
->frame
[v4l2_buf
->index
];
1457 memcpy(v4l2_buf
, &frame
->v4l2_buf
, sizeof *v4l2_buf
);
1461 static int vidioc_streamon(struct file
*file
, void *priv
,
1462 enum v4l2_buf_type buf_type
)
1464 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1467 if (buf_type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
1469 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1470 return -ERESTARTSYS
;
1472 /* check the capture file */
1473 if (gspca_dev
->capt_file
!= file
) {
1478 if (gspca_dev
->nframes
== 0
1479 || !(gspca_dev
->frame
[0].v4l2_buf
.flags
& V4L2_BUF_FLAG_QUEUED
)) {
1483 if (!gspca_dev
->streaming
) {
1484 ret
= gspca_init_transfer(gspca_dev
);
1488 PDEBUG_MODE(gspca_dev
, D_STREAM
, "stream on OK",
1489 gspca_dev
->pixfmt
.pixelformat
,
1490 gspca_dev
->pixfmt
.width
, gspca_dev
->pixfmt
.height
);
1493 mutex_unlock(&gspca_dev
->queue_lock
);
1497 static int vidioc_streamoff(struct file
*file
, void *priv
,
1498 enum v4l2_buf_type buf_type
)
1500 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1503 if (buf_type
!= V4L2_BUF_TYPE_VIDEO_CAPTURE
)
1506 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1507 return -ERESTARTSYS
;
1509 if (!gspca_dev
->streaming
) {
1514 /* check the capture file */
1515 if (gspca_dev
->capt_file
!= file
) {
1520 /* stop streaming */
1521 gspca_stream_off(gspca_dev
);
1522 /* In case another thread is waiting in dqbuf */
1523 wake_up_interruptible(&gspca_dev
->wq
);
1525 /* empty the transfer queues */
1526 for (i
= 0; i
< gspca_dev
->nframes
; i
++)
1527 gspca_dev
->frame
[i
].v4l2_buf
.flags
&= ~BUF_ALL_FLAGS
;
1528 atomic_set(&gspca_dev
->fr_q
, 0);
1529 atomic_set(&gspca_dev
->fr_i
, 0);
1530 gspca_dev
->fr_o
= 0;
1533 mutex_unlock(&gspca_dev
->queue_lock
);
1537 static int vidioc_g_jpegcomp(struct file
*file
, void *priv
,
1538 struct v4l2_jpegcompression
*jpegcomp
)
1540 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1542 gspca_dev
->usb_err
= 0;
1543 return gspca_dev
->sd_desc
->get_jcomp(gspca_dev
, jpegcomp
);
1546 static int vidioc_s_jpegcomp(struct file
*file
, void *priv
,
1547 const struct v4l2_jpegcompression
*jpegcomp
)
1549 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1551 gspca_dev
->usb_err
= 0;
1552 return gspca_dev
->sd_desc
->set_jcomp(gspca_dev
, jpegcomp
);
1555 static int vidioc_g_parm(struct file
*filp
, void *priv
,
1556 struct v4l2_streamparm
*parm
)
1558 struct gspca_dev
*gspca_dev
= video_drvdata(filp
);
1560 parm
->parm
.capture
.readbuffers
= gspca_dev
->nbufread
;
1562 if (gspca_dev
->sd_desc
->get_streamparm
) {
1563 gspca_dev
->usb_err
= 0;
1564 gspca_dev
->sd_desc
->get_streamparm(gspca_dev
, parm
);
1565 return gspca_dev
->usb_err
;
1570 static int vidioc_s_parm(struct file
*filp
, void *priv
,
1571 struct v4l2_streamparm
*parm
)
1573 struct gspca_dev
*gspca_dev
= video_drvdata(filp
);
1576 n
= parm
->parm
.capture
.readbuffers
;
1577 if (n
== 0 || n
>= GSPCA_MAX_FRAMES
)
1578 parm
->parm
.capture
.readbuffers
= gspca_dev
->nbufread
;
1580 gspca_dev
->nbufread
= n
;
1582 if (gspca_dev
->sd_desc
->set_streamparm
) {
1583 gspca_dev
->usb_err
= 0;
1584 gspca_dev
->sd_desc
->set_streamparm(gspca_dev
, parm
);
1585 return gspca_dev
->usb_err
;
1591 static int dev_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1593 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1594 struct gspca_frame
*frame
;
1596 unsigned long addr
, start
, size
;
1599 start
= vma
->vm_start
;
1600 size
= vma
->vm_end
- vma
->vm_start
;
1601 PDEBUG(D_STREAM
, "mmap start:%08x size:%d", (int) start
, (int) size
);
1603 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1604 return -ERESTARTSYS
;
1605 if (gspca_dev
->capt_file
!= file
) {
1611 for (i
= 0; i
< gspca_dev
->nframes
; ++i
) {
1612 if (gspca_dev
->frame
[i
].v4l2_buf
.memory
!= V4L2_MEMORY_MMAP
) {
1613 PDEBUG(D_STREAM
, "mmap bad memory type");
1616 if ((gspca_dev
->frame
[i
].v4l2_buf
.m
.offset
>> PAGE_SHIFT
)
1618 frame
= &gspca_dev
->frame
[i
];
1622 if (frame
== NULL
) {
1623 PDEBUG(D_STREAM
, "mmap no frame buffer found");
1627 if (size
!= frame
->v4l2_buf
.length
) {
1628 PDEBUG(D_STREAM
, "mmap bad size");
1634 * - VM_IO marks the area as being a mmaped region for I/O to a
1635 * device. It also prevents the region from being core dumped.
1637 vma
->vm_flags
|= VM_IO
;
1639 addr
= (unsigned long) frame
->data
;
1641 page
= vmalloc_to_page((void *) addr
);
1642 ret
= vm_insert_page(vma
, start
, page
);
1650 vma
->vm_ops
= &gspca_vm_ops
;
1651 vma
->vm_private_data
= frame
;
1655 mutex_unlock(&gspca_dev
->queue_lock
);
1659 static int frame_ready_nolock(struct gspca_dev
*gspca_dev
, struct file
*file
,
1660 enum v4l2_memory memory
)
1662 if (!gspca_dev
->present
)
1664 if (gspca_dev
->capt_file
!= file
|| gspca_dev
->memory
!= memory
||
1665 !gspca_dev
->streaming
)
1668 /* check if a frame is ready */
1669 return gspca_dev
->fr_o
!= atomic_read(&gspca_dev
->fr_i
);
1672 static int frame_ready(struct gspca_dev
*gspca_dev
, struct file
*file
,
1673 enum v4l2_memory memory
)
1677 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1678 return -ERESTARTSYS
;
1679 ret
= frame_ready_nolock(gspca_dev
, file
, memory
);
1680 mutex_unlock(&gspca_dev
->queue_lock
);
1685 * dequeue a video buffer
1687 * If nonblock_ing is false, block until a buffer is available.
1689 static int vidioc_dqbuf(struct file
*file
, void *priv
,
1690 struct v4l2_buffer
*v4l2_buf
)
1692 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1693 struct gspca_frame
*frame
;
1696 PDEBUG(D_FRAM
, "dqbuf");
1698 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1699 return -ERESTARTSYS
;
1702 ret
= frame_ready_nolock(gspca_dev
, file
, v4l2_buf
->memory
);
1708 mutex_unlock(&gspca_dev
->queue_lock
);
1710 if (file
->f_flags
& O_NONBLOCK
)
1713 /* wait till a frame is ready */
1714 ret
= wait_event_interruptible_timeout(gspca_dev
->wq
,
1715 frame_ready(gspca_dev
, file
, v4l2_buf
->memory
),
1716 msecs_to_jiffies(3000));
1722 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1723 return -ERESTARTSYS
;
1726 i
= gspca_dev
->fr_o
;
1727 j
= gspca_dev
->fr_queue
[i
];
1728 frame
= &gspca_dev
->frame
[j
];
1730 gspca_dev
->fr_o
= (i
+ 1) % GSPCA_MAX_FRAMES
;
1732 frame
->v4l2_buf
.flags
&= ~V4L2_BUF_FLAG_DONE
;
1733 memcpy(v4l2_buf
, &frame
->v4l2_buf
, sizeof *v4l2_buf
);
1734 PDEBUG(D_FRAM
, "dqbuf %d", j
);
1737 if (gspca_dev
->memory
== V4L2_MEMORY_USERPTR
) {
1738 if (copy_to_user((__u8 __user
*) frame
->v4l2_buf
.m
.userptr
,
1740 frame
->v4l2_buf
.bytesused
)) {
1741 PERR("dqbuf cp to user failed");
1746 mutex_unlock(&gspca_dev
->queue_lock
);
1748 if (ret
== 0 && gspca_dev
->sd_desc
->dq_callback
) {
1749 mutex_lock(&gspca_dev
->usb_lock
);
1750 gspca_dev
->usb_err
= 0;
1751 if (gspca_dev
->present
)
1752 gspca_dev
->sd_desc
->dq_callback(gspca_dev
);
1753 mutex_unlock(&gspca_dev
->usb_lock
);
1760 * queue a video buffer
1762 * Attempting to queue a buffer that has already been
1763 * queued will return -EINVAL.
1765 static int vidioc_qbuf(struct file
*file
, void *priv
,
1766 struct v4l2_buffer
*v4l2_buf
)
1768 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1769 struct gspca_frame
*frame
;
1772 PDEBUG(D_FRAM
, "qbuf %d", v4l2_buf
->index
);
1774 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
))
1775 return -ERESTARTSYS
;
1777 index
= v4l2_buf
->index
;
1778 if ((unsigned) index
>= gspca_dev
->nframes
) {
1780 "qbuf idx %d >= %d", index
, gspca_dev
->nframes
);
1784 if (v4l2_buf
->memory
!= gspca_dev
->memory
) {
1785 PDEBUG(D_FRAM
, "qbuf bad memory type");
1790 frame
= &gspca_dev
->frame
[index
];
1791 if (frame
->v4l2_buf
.flags
& BUF_ALL_FLAGS
) {
1792 PDEBUG(D_FRAM
, "qbuf bad state");
1797 frame
->v4l2_buf
.flags
|= V4L2_BUF_FLAG_QUEUED
;
1799 if (frame
->v4l2_buf
.memory
== V4L2_MEMORY_USERPTR
) {
1800 frame
->v4l2_buf
.m
.userptr
= v4l2_buf
->m
.userptr
;
1801 frame
->v4l2_buf
.length
= v4l2_buf
->length
;
1804 /* put the buffer in the 'queued' queue */
1805 i
= atomic_read(&gspca_dev
->fr_q
);
1806 gspca_dev
->fr_queue
[i
] = index
;
1807 atomic_set(&gspca_dev
->fr_q
, (i
+ 1) % GSPCA_MAX_FRAMES
);
1809 v4l2_buf
->flags
|= V4L2_BUF_FLAG_QUEUED
;
1810 v4l2_buf
->flags
&= ~V4L2_BUF_FLAG_DONE
;
1813 mutex_unlock(&gspca_dev
->queue_lock
);
1818 * allocate the resources for read()
1820 static int read_alloc(struct gspca_dev
*gspca_dev
,
1823 struct v4l2_buffer v4l2_buf
;
1826 PDEBUG(D_STREAM
, "read alloc");
1828 if (mutex_lock_interruptible(&gspca_dev
->usb_lock
))
1829 return -ERESTARTSYS
;
1831 if (gspca_dev
->nframes
== 0) {
1832 struct v4l2_requestbuffers rb
;
1834 memset(&rb
, 0, sizeof rb
);
1835 rb
.count
= gspca_dev
->nbufread
;
1836 rb
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
1837 rb
.memory
= GSPCA_MEMORY_READ
;
1838 ret
= vidioc_reqbufs(file
, gspca_dev
, &rb
);
1840 PDEBUG(D_STREAM
, "read reqbuf err %d", ret
);
1843 memset(&v4l2_buf
, 0, sizeof v4l2_buf
);
1844 v4l2_buf
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
1845 v4l2_buf
.memory
= GSPCA_MEMORY_READ
;
1846 for (i
= 0; i
< gspca_dev
->nbufread
; i
++) {
1848 ret
= vidioc_qbuf(file
, gspca_dev
, &v4l2_buf
);
1850 PDEBUG(D_STREAM
, "read qbuf err: %d", ret
);
1856 /* start streaming */
1857 ret
= vidioc_streamon(file
, gspca_dev
, V4L2_BUF_TYPE_VIDEO_CAPTURE
);
1859 PDEBUG(D_STREAM
, "read streamon err %d", ret
);
1861 mutex_unlock(&gspca_dev
->usb_lock
);
1865 static __poll_t
dev_poll(struct file
*file
, poll_table
*wait
)
1867 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1868 __poll_t req_events
= poll_requested_events(wait
);
1871 PDEBUG(D_FRAM
, "poll");
1873 if (req_events
& POLLPRI
)
1874 ret
|= v4l2_ctrl_poll(file
, wait
);
1876 if (req_events
& (POLLIN
| POLLRDNORM
)) {
1877 /* if reqbufs is not done, the user would use read() */
1878 if (gspca_dev
->memory
== GSPCA_MEMORY_NO
) {
1879 if (read_alloc(gspca_dev
, file
) != 0) {
1885 poll_wait(file
, &gspca_dev
->wq
, wait
);
1887 /* check if an image has been received */
1888 if (mutex_lock_interruptible(&gspca_dev
->queue_lock
) != 0) {
1892 if (gspca_dev
->fr_o
!= atomic_read(&gspca_dev
->fr_i
))
1893 ret
|= POLLIN
| POLLRDNORM
;
1894 mutex_unlock(&gspca_dev
->queue_lock
);
1898 if (!gspca_dev
->present
)
1904 static ssize_t
dev_read(struct file
*file
, char __user
*data
,
1905 size_t count
, loff_t
*ppos
)
1907 struct gspca_dev
*gspca_dev
= video_drvdata(file
);
1908 struct gspca_frame
*frame
;
1909 struct v4l2_buffer v4l2_buf
;
1910 struct timeval timestamp
;
1913 PDEBUG(D_FRAM
, "read (%zd)", count
);
1914 if (gspca_dev
->memory
== GSPCA_MEMORY_NO
) { /* first time ? */
1915 ret
= read_alloc(gspca_dev
, file
);
1921 v4l2_get_timestamp(×tamp
);
1925 memset(&v4l2_buf
, 0, sizeof v4l2_buf
);
1926 v4l2_buf
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
1927 v4l2_buf
.memory
= GSPCA_MEMORY_READ
;
1928 ret
= vidioc_dqbuf(file
, gspca_dev
, &v4l2_buf
);
1930 PDEBUG(D_STREAM
, "read dqbuf err %d", ret
);
1934 /* if the process slept for more than 1 second,
1935 * get a newer frame */
1936 frame
= &gspca_dev
->frame
[v4l2_buf
.index
];
1938 break; /* avoid infinite loop */
1939 if (frame
->v4l2_buf
.timestamp
.tv_sec
>= timestamp
.tv_sec
)
1941 ret
= vidioc_qbuf(file
, gspca_dev
, &v4l2_buf
);
1943 PDEBUG(D_STREAM
, "read qbuf err %d", ret
);
1948 /* copy the frame */
1949 if (count
> frame
->v4l2_buf
.bytesused
)
1950 count
= frame
->v4l2_buf
.bytesused
;
1951 ret
= copy_to_user(data
, frame
->data
, count
);
1953 PERR("read cp to user lack %d / %zd", ret
, count
);
1959 /* in each case, requeue the buffer */
1960 ret2
= vidioc_qbuf(file
, gspca_dev
, &v4l2_buf
);
1966 static const struct v4l2_file_operations dev_fops
= {
1967 .owner
= THIS_MODULE
,
1969 .release
= dev_close
,
1972 .unlocked_ioctl
= video_ioctl2
,
1976 static const struct v4l2_ioctl_ops dev_ioctl_ops
= {
1977 .vidioc_querycap
= vidioc_querycap
,
1978 .vidioc_dqbuf
= vidioc_dqbuf
,
1979 .vidioc_qbuf
= vidioc_qbuf
,
1980 .vidioc_enum_fmt_vid_cap
= vidioc_enum_fmt_vid_cap
,
1981 .vidioc_try_fmt_vid_cap
= vidioc_try_fmt_vid_cap
,
1982 .vidioc_g_fmt_vid_cap
= vidioc_g_fmt_vid_cap
,
1983 .vidioc_s_fmt_vid_cap
= vidioc_s_fmt_vid_cap
,
1984 .vidioc_streamon
= vidioc_streamon
,
1985 .vidioc_enum_input
= vidioc_enum_input
,
1986 .vidioc_g_input
= vidioc_g_input
,
1987 .vidioc_s_input
= vidioc_s_input
,
1988 .vidioc_reqbufs
= vidioc_reqbufs
,
1989 .vidioc_querybuf
= vidioc_querybuf
,
1990 .vidioc_streamoff
= vidioc_streamoff
,
1991 .vidioc_g_jpegcomp
= vidioc_g_jpegcomp
,
1992 .vidioc_s_jpegcomp
= vidioc_s_jpegcomp
,
1993 .vidioc_g_parm
= vidioc_g_parm
,
1994 .vidioc_s_parm
= vidioc_s_parm
,
1995 .vidioc_enum_framesizes
= vidioc_enum_framesizes
,
1996 .vidioc_enum_frameintervals
= vidioc_enum_frameintervals
,
1997 #ifdef CONFIG_VIDEO_ADV_DEBUG
1998 .vidioc_g_chip_info
= vidioc_g_chip_info
,
1999 .vidioc_g_register
= vidioc_g_register
,
2000 .vidioc_s_register
= vidioc_s_register
,
2002 .vidioc_subscribe_event
= v4l2_ctrl_subscribe_event
,
2003 .vidioc_unsubscribe_event
= v4l2_event_unsubscribe
,
2006 static const struct video_device gspca_template
= {
2007 .name
= "gspca main driver",
2009 .ioctl_ops
= &dev_ioctl_ops
,
2010 .release
= video_device_release_empty
, /* We use v4l2_dev.release */
2014 * probe and create a new gspca device
2016 * This function must be called by the sub-driver when it is
2017 * called for probing a new device.
2019 int gspca_dev_probe2(struct usb_interface
*intf
,
2020 const struct usb_device_id
*id
,
2021 const struct sd_desc
*sd_desc
,
2023 struct module
*module
)
2025 struct gspca_dev
*gspca_dev
;
2026 struct usb_device
*dev
= interface_to_usbdev(intf
);
2029 pr_info("%s-" GSPCA_VERSION
" probing %04x:%04x\n",
2030 sd_desc
->name
, id
->idVendor
, id
->idProduct
);
2032 /* create the device */
2033 if (dev_size
< sizeof *gspca_dev
)
2034 dev_size
= sizeof *gspca_dev
;
2035 gspca_dev
= kzalloc(dev_size
, GFP_KERNEL
);
2037 pr_err("couldn't kzalloc gspca struct\n");
2040 gspca_dev
->usb_buf
= kmalloc(USB_BUF_SZ
, GFP_KERNEL
);
2041 if (!gspca_dev
->usb_buf
) {
2042 pr_err("out of memory\n");
2046 gspca_dev
->dev
= dev
;
2047 gspca_dev
->iface
= intf
->cur_altsetting
->desc
.bInterfaceNumber
;
2048 gspca_dev
->xfer_ep
= -1;
2050 /* check if any audio device */
2051 if (dev
->actconfig
->desc
.bNumInterfaces
!= 1) {
2053 struct usb_interface
*intf2
;
2055 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
2056 intf2
= dev
->actconfig
->interface
[i
];
2058 && intf2
->altsetting
!= NULL
2059 && intf2
->altsetting
->desc
.bInterfaceClass
==
2061 gspca_dev
->audio
= 1;
2067 gspca_dev
->v4l2_dev
.release
= gspca_release
;
2068 ret
= v4l2_device_register(&intf
->dev
, &gspca_dev
->v4l2_dev
);
2071 gspca_dev
->sd_desc
= sd_desc
;
2072 gspca_dev
->nbufread
= 2;
2073 gspca_dev
->empty_packet
= -1; /* don't check the empty packets */
2074 gspca_dev
->vdev
= gspca_template
;
2075 gspca_dev
->vdev
.v4l2_dev
= &gspca_dev
->v4l2_dev
;
2076 video_set_drvdata(&gspca_dev
->vdev
, gspca_dev
);
2077 gspca_dev
->module
= module
;
2078 gspca_dev
->present
= 1;
2080 mutex_init(&gspca_dev
->usb_lock
);
2081 gspca_dev
->vdev
.lock
= &gspca_dev
->usb_lock
;
2082 mutex_init(&gspca_dev
->queue_lock
);
2083 init_waitqueue_head(&gspca_dev
->wq
);
2085 /* configure the subdriver and initialize the USB device */
2086 ret
= sd_desc
->config(gspca_dev
, id
);
2089 ret
= sd_desc
->init(gspca_dev
);
2092 if (sd_desc
->init_controls
)
2093 ret
= sd_desc
->init_controls(gspca_dev
);
2096 gspca_set_default_mode(gspca_dev
);
2098 ret
= gspca_input_connect(gspca_dev
);
2103 * Don't take usb_lock for these ioctls. This improves latency if
2104 * usb_lock is taken for a long time, e.g. when changing a control
2105 * value, and a new frame is ready to be dequeued.
2107 v4l2_disable_ioctl_locking(&gspca_dev
->vdev
, VIDIOC_DQBUF
);
2108 v4l2_disable_ioctl_locking(&gspca_dev
->vdev
, VIDIOC_QBUF
);
2109 v4l2_disable_ioctl_locking(&gspca_dev
->vdev
, VIDIOC_QUERYBUF
);
2110 #ifdef CONFIG_VIDEO_ADV_DEBUG
2111 if (!gspca_dev
->sd_desc
->get_register
)
2112 v4l2_disable_ioctl(&gspca_dev
->vdev
, VIDIOC_DBG_G_REGISTER
);
2113 if (!gspca_dev
->sd_desc
->set_register
)
2114 v4l2_disable_ioctl(&gspca_dev
->vdev
, VIDIOC_DBG_S_REGISTER
);
2116 if (!gspca_dev
->sd_desc
->get_jcomp
)
2117 v4l2_disable_ioctl(&gspca_dev
->vdev
, VIDIOC_G_JPEGCOMP
);
2118 if (!gspca_dev
->sd_desc
->set_jcomp
)
2119 v4l2_disable_ioctl(&gspca_dev
->vdev
, VIDIOC_S_JPEGCOMP
);
2121 /* init video stuff */
2122 ret
= video_register_device(&gspca_dev
->vdev
,
2126 pr_err("video_register_device err %d\n", ret
);
2130 usb_set_intfdata(intf
, gspca_dev
);
2131 PDEBUG(D_PROBE
, "%s created", video_device_node_name(&gspca_dev
->vdev
));
2133 gspca_input_create_urb(gspca_dev
);
2137 #if IS_ENABLED(CONFIG_INPUT)
2138 if (gspca_dev
->input_dev
)
2139 input_unregister_device(gspca_dev
->input_dev
);
2141 v4l2_ctrl_handler_free(gspca_dev
->vdev
.ctrl_handler
);
2142 kfree(gspca_dev
->usb_buf
);
2146 EXPORT_SYMBOL(gspca_dev_probe2
);
2148 /* same function as the previous one, but check the interface */
2149 int gspca_dev_probe(struct usb_interface
*intf
,
2150 const struct usb_device_id
*id
,
2151 const struct sd_desc
*sd_desc
,
2153 struct module
*module
)
2155 struct usb_device
*dev
= interface_to_usbdev(intf
);
2157 /* we don't handle multi-config cameras */
2158 if (dev
->descriptor
.bNumConfigurations
!= 1) {
2159 pr_err("%04x:%04x too many config\n",
2160 id
->idVendor
, id
->idProduct
);
2164 /* the USB video interface must be the first one */
2165 if (dev
->actconfig
->desc
.bNumInterfaces
!= 1
2166 && intf
->cur_altsetting
->desc
.bInterfaceNumber
!= 0)
2169 return gspca_dev_probe2(intf
, id
, sd_desc
, dev_size
, module
);
2171 EXPORT_SYMBOL(gspca_dev_probe
);
2176 * This function must be called by the sub-driver
2177 * when the device disconnects, after the specific resources are freed.
2179 void gspca_disconnect(struct usb_interface
*intf
)
2181 struct gspca_dev
*gspca_dev
= usb_get_intfdata(intf
);
2182 #if IS_ENABLED(CONFIG_INPUT)
2183 struct input_dev
*input_dev
;
2186 PDEBUG(D_PROBE
, "%s disconnect",
2187 video_device_node_name(&gspca_dev
->vdev
));
2189 mutex_lock(&gspca_dev
->usb_lock
);
2191 gspca_dev
->present
= 0;
2192 destroy_urbs(gspca_dev
);
2194 #if IS_ENABLED(CONFIG_INPUT)
2195 gspca_input_destroy_urb(gspca_dev
);
2196 input_dev
= gspca_dev
->input_dev
;
2198 gspca_dev
->input_dev
= NULL
;
2199 input_unregister_device(input_dev
);
2202 /* Free subdriver's streaming resources / stop sd workqueue(s) */
2203 if (gspca_dev
->sd_desc
->stop0
&& gspca_dev
->streaming
)
2204 gspca_dev
->sd_desc
->stop0(gspca_dev
);
2205 gspca_dev
->streaming
= 0;
2206 gspca_dev
->dev
= NULL
;
2207 wake_up_interruptible(&gspca_dev
->wq
);
2209 v4l2_device_disconnect(&gspca_dev
->v4l2_dev
);
2210 video_unregister_device(&gspca_dev
->vdev
);
2212 mutex_unlock(&gspca_dev
->usb_lock
);
2214 /* (this will call gspca_release() immediately or on last close) */
2215 v4l2_device_put(&gspca_dev
->v4l2_dev
);
2217 EXPORT_SYMBOL(gspca_disconnect
);
2220 int gspca_suspend(struct usb_interface
*intf
, pm_message_t message
)
2222 struct gspca_dev
*gspca_dev
= usb_get_intfdata(intf
);
2224 gspca_input_destroy_urb(gspca_dev
);
2226 if (!gspca_dev
->streaming
)
2229 mutex_lock(&gspca_dev
->usb_lock
);
2230 gspca_dev
->frozen
= 1; /* avoid urb error messages */
2231 gspca_dev
->usb_err
= 0;
2232 if (gspca_dev
->sd_desc
->stopN
)
2233 gspca_dev
->sd_desc
->stopN(gspca_dev
);
2234 destroy_urbs(gspca_dev
);
2235 gspca_set_alt0(gspca_dev
);
2236 if (gspca_dev
->sd_desc
->stop0
)
2237 gspca_dev
->sd_desc
->stop0(gspca_dev
);
2238 mutex_unlock(&gspca_dev
->usb_lock
);
2242 EXPORT_SYMBOL(gspca_suspend
);
2244 int gspca_resume(struct usb_interface
*intf
)
2246 struct gspca_dev
*gspca_dev
= usb_get_intfdata(intf
);
2247 int streaming
, ret
= 0;
2249 mutex_lock(&gspca_dev
->usb_lock
);
2250 gspca_dev
->frozen
= 0;
2251 gspca_dev
->usb_err
= 0;
2252 gspca_dev
->sd_desc
->init(gspca_dev
);
2254 * Most subdrivers send all ctrl values on sd_start and thus
2255 * only write to the device registers on s_ctrl when streaming ->
2256 * Clear streaming to avoid setting all ctrls twice.
2258 streaming
= gspca_dev
->streaming
;
2259 gspca_dev
->streaming
= 0;
2261 ret
= gspca_init_transfer(gspca_dev
);
2263 gspca_input_create_urb(gspca_dev
);
2264 mutex_unlock(&gspca_dev
->usb_lock
);
2268 EXPORT_SYMBOL(gspca_resume
);
2271 /* -- module insert / remove -- */
2272 static int __init
gspca_init(void)
2274 pr_info("v" GSPCA_VERSION
" registered\n");
2277 static void __exit
gspca_exit(void)
2281 module_init(gspca_init
);
2282 module_exit(gspca_exit
);
2284 module_param_named(debug
, gspca_debug
, int, 0644);
2285 MODULE_PARM_DESC(debug
,
2286 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");