Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / drivers / media / video / gspca / gspca.c
1 /*
2  * Main USB camera driver
3  *
4  * Copyright (C) 2008-2009 Jean-Francois Moine (http://moinejf.free.fr)
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; either version 2 of the License, or (at your
9  * option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19  */
20
21 #define MODULE_NAME "gspca"
22
23 #include <linux/init.h>
24 #include <linux/version.h>
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/mm.h>
30 #include <linux/string.h>
31 #include <linux/pagemap.h>
32 #include <linux/io.h>
33 #include <asm/page.h>
34 #include <linux/uaccess.h>
35 #include <linux/jiffies.h>
36 #include <media/v4l2-ioctl.h>
37
38 #include "gspca.h"
39
40 /* global values */
41 #define DEF_NURBS 3             /* default number of URBs */
42 #if DEF_NURBS > MAX_NURBS
43 #error "DEF_NURBS too big"
44 #endif
45
46 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
47 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
48 MODULE_LICENSE("GPL");
49
50 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 7, 0)
51
52 #ifdef GSPCA_DEBUG
53 int gspca_debug = D_ERR | D_PROBE;
54 EXPORT_SYMBOL(gspca_debug);
55
56 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
57 {
58         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
59                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
60                         txt,
61                         pixfmt & 0xff,
62                         (pixfmt >> 8) & 0xff,
63                         (pixfmt >> 16) & 0xff,
64                         pixfmt >> 24,
65                         w, h);
66         } else {
67                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
68                         txt,
69                         pixfmt,
70                         w, h);
71         }
72 }
73 #else
74 #define PDEBUG_MODE(txt, pixfmt, w, h)
75 #endif
76
77 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
78 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
79 #define GSPCA_MEMORY_READ 7
80
81 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
82
83 /*
84  * VMA operations.
85  */
86 static void gspca_vm_open(struct vm_area_struct *vma)
87 {
88         struct gspca_frame *frame = vma->vm_private_data;
89
90         frame->vma_use_count++;
91         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
92 }
93
94 static void gspca_vm_close(struct vm_area_struct *vma)
95 {
96         struct gspca_frame *frame = vma->vm_private_data;
97
98         if (--frame->vma_use_count <= 0)
99                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
100 }
101
102 static struct vm_operations_struct gspca_vm_ops = {
103         .open           = gspca_vm_open,
104         .close          = gspca_vm_close,
105 };
106
107 /* get the current input frame buffer */
108 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
109 {
110         struct gspca_frame *frame;
111         int i;
112
113         i = gspca_dev->fr_i;
114         i = gspca_dev->fr_queue[i];
115         frame = &gspca_dev->frame[i];
116         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
117                                 != V4L2_BUF_FLAG_QUEUED)
118                 return NULL;
119         return frame;
120 }
121 EXPORT_SYMBOL(gspca_get_i_frame);
122
123 /*
124  * fill a video frame from an URB and resubmit
125  */
126 static void fill_frame(struct gspca_dev *gspca_dev,
127                         struct urb *urb)
128 {
129         struct gspca_frame *frame;
130         u8 *data;               /* address of data in the iso message */
131         int i, len, st;
132         cam_pkt_op pkt_scan;
133
134         if (urb->status != 0) {
135                 if (urb->status == -ESHUTDOWN)
136                         return;         /* disconnection */
137 #ifdef CONFIG_PM
138                 if (!gspca_dev->frozen)
139 #endif
140                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
141                 return;
142         }
143         pkt_scan = gspca_dev->sd_desc->pkt_scan;
144         for (i = 0; i < urb->number_of_packets; i++) {
145
146                 /* check the availability of the frame buffer */
147                 frame = gspca_get_i_frame(gspca_dev);
148                 if (!frame) {
149                         gspca_dev->last_packet_type = DISCARD_PACKET;
150                         break;
151                 }
152
153                 /* check the packet status and length */
154                 len = urb->iso_frame_desc[i].actual_length;
155                 if (len == 0) {
156                         if (gspca_dev->empty_packet == 0)
157                                 gspca_dev->empty_packet = 1;
158                         continue;
159                 }
160                 st = urb->iso_frame_desc[i].status;
161                 if (st) {
162                         PDEBUG(D_ERR,
163                                 "ISOC data error: [%d] len=%d, status=%d",
164                                 i, len, st);
165                         gspca_dev->last_packet_type = DISCARD_PACKET;
166                         continue;
167                 }
168
169                 /* let the packet be analyzed by the subdriver */
170                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
171                         i, urb->iso_frame_desc[i].offset, len);
172                 data = (u8 *) urb->transfer_buffer
173                                         + urb->iso_frame_desc[i].offset;
174                 pkt_scan(gspca_dev, frame, data, len);
175         }
176
177         /* resubmit the URB */
178         st = usb_submit_urb(urb, GFP_ATOMIC);
179         if (st < 0)
180                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
181 }
182
183 /*
184  * ISOC message interrupt from the USB device
185  *
186  * Analyse each packet and call the subdriver for copy to the frame buffer.
187  */
188 static void isoc_irq(struct urb *urb)
189 {
190         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
191
192         PDEBUG(D_PACK, "isoc irq");
193         if (!gspca_dev->streaming)
194                 return;
195         fill_frame(gspca_dev, urb);
196 }
197
198 /*
199  * bulk message interrupt from the USB device
200  */
201 static void bulk_irq(struct urb *urb)
202 {
203         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
204         struct gspca_frame *frame;
205         int st;
206
207         PDEBUG(D_PACK, "bulk irq");
208         if (!gspca_dev->streaming)
209                 return;
210         switch (urb->status) {
211         case 0:
212                 break;
213         case -ESHUTDOWN:
214                 return;         /* disconnection */
215         case -ECONNRESET:
216                 urb->status = 0;
217                 break;
218         default:
219 #ifdef CONFIG_PM
220                 if (!gspca_dev->frozen)
221 #endif
222                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
223                 return;
224         }
225
226         /* check the availability of the frame buffer */
227         frame = gspca_get_i_frame(gspca_dev);
228         if (!frame) {
229                 gspca_dev->last_packet_type = DISCARD_PACKET;
230         } else {
231                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
232                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
233                                         frame,
234                                         urb->transfer_buffer,
235                                         urb->actual_length);
236         }
237
238         /* resubmit the URB */
239         if (gspca_dev->cam.bulk_nurbs != 0) {
240                 st = usb_submit_urb(urb, GFP_ATOMIC);
241                 if (st < 0)
242                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
243         }
244 }
245
246 /*
247  * add data to the current frame
248  *
249  * This function is called by the subdrivers at interrupt level.
250  *
251  * To build a frame, these ones must add
252  *      - one FIRST_PACKET
253  *      - 0 or many INTER_PACKETs
254  *      - one LAST_PACKET
255  * DISCARD_PACKET invalidates the whole frame.
256  * On LAST_PACKET, a new frame is returned.
257  */
258 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
259                                     enum gspca_packet_type packet_type,
260                                     struct gspca_frame *frame,
261                                     const __u8 *data,
262                                     int len)
263 {
264         int i, j;
265
266         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
267
268         /* when start of a new frame, if the current frame buffer
269          * is not queued, discard the whole frame */
270         if (packet_type == FIRST_PACKET) {
271                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
272                                                 != V4L2_BUF_FLAG_QUEUED) {
273                         gspca_dev->last_packet_type = DISCARD_PACKET;
274                         return frame;
275                 }
276                 frame->data_end = frame->data;
277                 jiffies_to_timeval(get_jiffies_64(),
278                                    &frame->v4l2_buf.timestamp);
279                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
280         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
281                 if (packet_type == LAST_PACKET)
282                         gspca_dev->last_packet_type = packet_type;
283                 return frame;
284         }
285
286         /* append the packet to the frame buffer */
287         if (len > 0) {
288                 if (frame->data_end - frame->data + len
289                                                  > frame->v4l2_buf.length) {
290                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
291                                 frame->data_end - frame->data + len,
292                                 frame->v4l2_buf.length);
293                         packet_type = DISCARD_PACKET;
294                 } else {
295                         memcpy(frame->data_end, data, len);
296                         frame->data_end += len;
297                 }
298         }
299         gspca_dev->last_packet_type = packet_type;
300
301         /* if last packet, wake up the application and advance in the queue */
302         if (packet_type == LAST_PACKET) {
303                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
304                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
305                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
306                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
307                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
308                 gspca_dev->fr_i = i;
309                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
310                         frame->v4l2_buf.bytesused,
311                         gspca_dev->fr_q,
312                         i,
313                         gspca_dev->fr_o);
314                 j = gspca_dev->fr_queue[i];
315                 frame = &gspca_dev->frame[j];
316         }
317         return frame;
318 }
319 EXPORT_SYMBOL(gspca_frame_add);
320
321 static int gspca_is_compressed(__u32 format)
322 {
323         switch (format) {
324         case V4L2_PIX_FMT_MJPEG:
325         case V4L2_PIX_FMT_JPEG:
326         case V4L2_PIX_FMT_SPCA561:
327         case V4L2_PIX_FMT_PAC207:
328         case V4L2_PIX_FMT_MR97310A:
329                 return 1;
330         }
331         return 0;
332 }
333
334 static void *rvmalloc(unsigned long size)
335 {
336         void *mem;
337         unsigned long adr;
338
339         mem = vmalloc_32(size);
340         if (mem != NULL) {
341                 adr = (unsigned long) mem;
342                 while ((long) size > 0) {
343                         SetPageReserved(vmalloc_to_page((void *) adr));
344                         adr += PAGE_SIZE;
345                         size -= PAGE_SIZE;
346                 }
347         }
348         return mem;
349 }
350
351 static void rvfree(void *mem, long size)
352 {
353         unsigned long adr;
354
355         adr = (unsigned long) mem;
356         while (size > 0) {
357                 ClearPageReserved(vmalloc_to_page((void *) adr));
358                 adr += PAGE_SIZE;
359                 size -= PAGE_SIZE;
360         }
361         vfree(mem);
362 }
363
364 static int frame_alloc(struct gspca_dev *gspca_dev,
365                         unsigned int count)
366 {
367         struct gspca_frame *frame;
368         unsigned int frsz;
369         int i;
370
371         i = gspca_dev->curr_mode;
372         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
373         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
374         frsz = PAGE_ALIGN(frsz);
375         gspca_dev->frsz = frsz;
376         if (count > GSPCA_MAX_FRAMES)
377                 count = GSPCA_MAX_FRAMES;
378         gspca_dev->frbuf = rvmalloc(frsz * count);
379         if (!gspca_dev->frbuf) {
380                 err("frame alloc failed");
381                 return -ENOMEM;
382         }
383         gspca_dev->nframes = count;
384         for (i = 0; i < count; i++) {
385                 frame = &gspca_dev->frame[i];
386                 frame->v4l2_buf.index = i;
387                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
388                 frame->v4l2_buf.flags = 0;
389                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
390                 frame->v4l2_buf.length = frsz;
391                 frame->v4l2_buf.memory = gspca_dev->memory;
392                 frame->v4l2_buf.sequence = 0;
393                 frame->data = frame->data_end =
394                                         gspca_dev->frbuf + i * frsz;
395                 frame->v4l2_buf.m.offset = i * frsz;
396         }
397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
398         gspca_dev->last_packet_type = DISCARD_PACKET;
399         gspca_dev->sequence = 0;
400         return 0;
401 }
402
403 static void frame_free(struct gspca_dev *gspca_dev)
404 {
405         int i;
406
407         PDEBUG(D_STREAM, "frame free");
408         if (gspca_dev->frbuf != NULL) {
409                 rvfree(gspca_dev->frbuf,
410                         gspca_dev->nframes * gspca_dev->frsz);
411                 gspca_dev->frbuf = NULL;
412                 for (i = 0; i < gspca_dev->nframes; i++)
413                         gspca_dev->frame[i].data = NULL;
414         }
415         gspca_dev->nframes = 0;
416 }
417
418 static void destroy_urbs(struct gspca_dev *gspca_dev)
419 {
420         struct urb *urb;
421         unsigned int i;
422
423         PDEBUG(D_STREAM, "kill transfer");
424         for (i = 0; i < MAX_NURBS; i++) {
425                 urb = gspca_dev->urb[i];
426                 if (urb == NULL)
427                         break;
428
429                 gspca_dev->urb[i] = NULL;
430                 usb_kill_urb(urb);
431                 if (urb->transfer_buffer != NULL)
432                         usb_buffer_free(gspca_dev->dev,
433                                         urb->transfer_buffer_length,
434                                         urb->transfer_buffer,
435                                         urb->transfer_dma);
436                 usb_free_urb(urb);
437         }
438 }
439
440 /*
441  * look for an input transfer endpoint in an alternate setting
442  */
443 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
444                                           int xfer)
445 {
446         struct usb_host_endpoint *ep;
447         int i, attr;
448
449         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
450                 ep = &alt->endpoint[i];
451                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
452                 if (attr == xfer
453                     && ep->desc.wMaxPacketSize != 0)
454                         return ep;
455         }
456         return NULL;
457 }
458
459 /*
460  * look for an input (isoc or bulk) endpoint
461  *
462  * The endpoint is defined by the subdriver.
463  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
464  * This routine may be called many times when the bandwidth is too small
465  * (the bandwidth is checked on urb submit).
466  */
467 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
468 {
469         struct usb_interface *intf;
470         struct usb_host_endpoint *ep;
471         int xfer, i, ret;
472
473         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
474         ep = NULL;
475         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
476                                    : USB_ENDPOINT_XFER_ISOC;
477         i = gspca_dev->alt;                     /* previous alt setting */
478         while (--i >= 0) {
479                 ep = alt_xfer(&intf->altsetting[i], xfer);
480                 if (ep)
481                         break;
482         }
483         if (ep == NULL) {
484                 err("no transfer endpoint found");
485                 return NULL;
486         }
487         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
488                         i, ep->desc.bEndpointAddress);
489         gspca_dev->alt = i;             /* memorize the current alt setting */
490         if (gspca_dev->nbalt > 1) {
491                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
492                 if (ret < 0) {
493                         err("set alt %d err %d", i, ret);
494                         return NULL;
495                 }
496         }
497         return ep;
498 }
499
500 /*
501  * create the URBs for image transfer
502  */
503 static int create_urbs(struct gspca_dev *gspca_dev,
504                         struct usb_host_endpoint *ep)
505 {
506         struct urb *urb;
507         int n, nurbs, i, psize, npkt, bsize;
508
509         /* calculate the packet size and the number of packets */
510         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
511
512         if (!gspca_dev->cam.bulk) {             /* isoc */
513
514                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
515                 if (gspca_dev->pkt_size == 0)
516                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
517                 else
518                         psize = gspca_dev->pkt_size;
519                 npkt = gspca_dev->cam.npkt;
520                 if (npkt == 0)
521                         npkt = 32;              /* default value */
522                 bsize = psize * npkt;
523                 PDEBUG(D_STREAM,
524                         "isoc %d pkts size %d = bsize:%d",
525                         npkt, psize, bsize);
526                 nurbs = DEF_NURBS;
527         } else {                                /* bulk */
528                 npkt = 0;
529                 bsize = gspca_dev->cam.bulk_size;
530                 if (bsize == 0)
531                         bsize = psize;
532                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
533                 if (gspca_dev->cam.bulk_nurbs != 0)
534                         nurbs = gspca_dev->cam.bulk_nurbs;
535                 else
536                         nurbs = 1;
537         }
538
539         gspca_dev->nurbs = nurbs;
540         for (n = 0; n < nurbs; n++) {
541                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
542                 if (!urb) {
543                         err("usb_alloc_urb failed");
544                         destroy_urbs(gspca_dev);
545                         return -ENOMEM;
546                 }
547                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
548                                                 bsize,
549                                                 GFP_KERNEL,
550                                                 &urb->transfer_dma);
551
552                 if (urb->transfer_buffer == NULL) {
553                         usb_free_urb(urb);
554                         err("usb_buffer_urb failed");
555                         destroy_urbs(gspca_dev);
556                         return -ENOMEM;
557                 }
558                 gspca_dev->urb[n] = urb;
559                 urb->dev = gspca_dev->dev;
560                 urb->context = gspca_dev;
561                 urb->transfer_buffer_length = bsize;
562                 if (npkt != 0) {                /* ISOC */
563                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
564                                                     ep->desc.bEndpointAddress);
565                         urb->transfer_flags = URB_ISO_ASAP
566                                         | URB_NO_TRANSFER_DMA_MAP;
567                         urb->interval = ep->desc.bInterval;
568                         urb->complete = isoc_irq;
569                         urb->number_of_packets = npkt;
570                         for (i = 0; i < npkt; i++) {
571                                 urb->iso_frame_desc[i].length = psize;
572                                 urb->iso_frame_desc[i].offset = psize * i;
573                         }
574                 } else {                /* bulk */
575                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
576                                                 ep->desc.bEndpointAddress),
577                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
578                         urb->complete = bulk_irq;
579                 }
580         }
581         return 0;
582 }
583
584 /*
585  * start the USB transfer
586  */
587 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
588 {
589         struct usb_host_endpoint *ep;
590         int n, ret;
591
592         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
593                 return -ERESTARTSYS;
594
595         if (!gspca_dev->present) {
596                 ret = -ENODEV;
597                 goto out;
598         }
599
600         /* set the higher alternate setting and
601          * loop until urb submit succeeds */
602         gspca_dev->alt = gspca_dev->nbalt;
603         if (gspca_dev->sd_desc->isoc_init) {
604                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
605                 if (ret < 0)
606                         goto out;
607         }
608         ep = get_ep(gspca_dev);
609         if (ep == NULL) {
610                 ret = -EIO;
611                 goto out;
612         }
613         for (;;) {
614                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
615                 ret = create_urbs(gspca_dev, ep);
616                 if (ret < 0)
617                         goto out;
618
619                 /* clear the bulk endpoint */
620                 if (gspca_dev->cam.bulk)
621                         usb_clear_halt(gspca_dev->dev,
622                                         gspca_dev->urb[0]->pipe);
623
624                 /* start the cam */
625                 ret = gspca_dev->sd_desc->start(gspca_dev);
626                 if (ret < 0) {
627                         destroy_urbs(gspca_dev);
628                         goto out;
629                 }
630                 gspca_dev->streaming = 1;
631
632                 /* some bulk transfers are started by the subdriver */
633                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
634                         break;
635
636                 /* submit the URBs */
637                 for (n = 0; n < gspca_dev->nurbs; n++) {
638                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
639                         if (ret < 0)
640                                 break;
641                 }
642                 if (ret >= 0)
643                         break;
644                 PDEBUG(D_ERR|D_STREAM,
645                         "usb_submit_urb alt %d err %d", gspca_dev->alt, ret);
646                 gspca_dev->streaming = 0;
647                 destroy_urbs(gspca_dev);
648                 if (ret != -ENOSPC)
649                         goto out;
650
651                 /* the bandwidth is not wide enough
652                  * negociate or try a lower alternate setting */
653                 msleep(20);     /* wait for kill complete */
654                 if (gspca_dev->sd_desc->isoc_nego) {
655                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
656                         if (ret < 0)
657                                 goto out;
658                 } else {
659                         ep = get_ep(gspca_dev);
660                         if (ep == NULL) {
661                                 ret = -EIO;
662                                 goto out;
663                         }
664                 }
665         }
666 out:
667         mutex_unlock(&gspca_dev->usb_lock);
668         return ret;
669 }
670
671 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
672 {
673         int ret;
674
675         if (gspca_dev->alt == 0)
676                 return 0;
677         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
678         if (ret < 0)
679                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
680         return ret;
681 }
682
683 /* Note: both the queue and the usb locks should be held when calling this */
684 static void gspca_stream_off(struct gspca_dev *gspca_dev)
685 {
686         gspca_dev->streaming = 0;
687         if (gspca_dev->present) {
688                 if (gspca_dev->sd_desc->stopN)
689                         gspca_dev->sd_desc->stopN(gspca_dev);
690                 destroy_urbs(gspca_dev);
691                 gspca_set_alt0(gspca_dev);
692         }
693
694         /* always call stop0 to free the subdriver's resources */
695         if (gspca_dev->sd_desc->stop0)
696                 gspca_dev->sd_desc->stop0(gspca_dev);
697         PDEBUG(D_STREAM, "stream off OK");
698 }
699
700 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
701 {
702         int i;
703
704         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
705         gspca_dev->curr_mode = i;
706         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
707         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
708         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
709 }
710
711 static int wxh_to_mode(struct gspca_dev *gspca_dev,
712                         int width, int height)
713 {
714         int i;
715
716         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
717                 if (width >= gspca_dev->cam.cam_mode[i].width
718                     && height >= gspca_dev->cam.cam_mode[i].height)
719                         break;
720         }
721         return i;
722 }
723
724 /*
725  * search a mode with the right pixel format
726  */
727 static int gspca_get_mode(struct gspca_dev *gspca_dev,
728                         int mode,
729                         int pixfmt)
730 {
731         int modeU, modeD;
732
733         modeU = modeD = mode;
734         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
735                 if (--modeD >= 0) {
736                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
737                                                                 == pixfmt)
738                                 return modeD;
739                 }
740                 if (++modeU < gspca_dev->cam.nmodes) {
741                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
742                                                                 == pixfmt)
743                                 return modeU;
744                 }
745         }
746         return -EINVAL;
747 }
748
749 #ifdef CONFIG_VIDEO_ADV_DEBUG
750 static int vidioc_g_register(struct file *file, void *priv,
751                         struct v4l2_dbg_register *reg)
752 {
753         int ret;
754         struct gspca_dev *gspca_dev = priv;
755
756         if (!gspca_dev->sd_desc->get_chip_ident)
757                 return -EINVAL;
758
759         if (!gspca_dev->sd_desc->get_register)
760                 return -EINVAL;
761
762         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
763                 return -ERESTARTSYS;
764         if (gspca_dev->present)
765                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
766         else
767                 ret = -ENODEV;
768         mutex_unlock(&gspca_dev->usb_lock);
769
770         return ret;
771 }
772
773 static int vidioc_s_register(struct file *file, void *priv,
774                         struct v4l2_dbg_register *reg)
775 {
776         int ret;
777         struct gspca_dev *gspca_dev = priv;
778
779         if (!gspca_dev->sd_desc->get_chip_ident)
780                 return -EINVAL;
781
782         if (!gspca_dev->sd_desc->set_register)
783                 return -EINVAL;
784
785         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
786                 return -ERESTARTSYS;
787         if (gspca_dev->present)
788                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
789         else
790                 ret = -ENODEV;
791         mutex_unlock(&gspca_dev->usb_lock);
792
793         return ret;
794 }
795 #endif
796
797 static int vidioc_g_chip_ident(struct file *file, void *priv,
798                         struct v4l2_dbg_chip_ident *chip)
799 {
800         int ret;
801         struct gspca_dev *gspca_dev = priv;
802
803         if (!gspca_dev->sd_desc->get_chip_ident)
804                 return -EINVAL;
805
806         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
807                 return -ERESTARTSYS;
808         if (gspca_dev->present)
809                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
810         else
811                 ret = -ENODEV;
812         mutex_unlock(&gspca_dev->usb_lock);
813
814         return ret;
815 }
816
817 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
818                                 struct v4l2_fmtdesc *fmtdesc)
819 {
820         struct gspca_dev *gspca_dev = priv;
821         int i, j, index;
822         __u32 fmt_tb[8];
823
824         /* give an index to each format */
825         index = 0;
826         j = 0;
827         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
828                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
829                 j = 0;
830                 for (;;) {
831                         if (fmt_tb[j] == fmt_tb[index])
832                                 break;
833                         j++;
834                 }
835                 if (j == index) {
836                         if (fmtdesc->index == index)
837                                 break;          /* new format */
838                         index++;
839                         if (index >= ARRAY_SIZE(fmt_tb))
840                                 return -EINVAL;
841                 }
842         }
843         if (i < 0)
844                 return -EINVAL;         /* no more format */
845
846         fmtdesc->pixelformat = fmt_tb[index];
847         if (gspca_is_compressed(fmt_tb[index]))
848                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
849         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
850         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
851         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
852         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
853         fmtdesc->description[4] = '\0';
854         return 0;
855 }
856
857 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
858                             struct v4l2_format *fmt)
859 {
860         struct gspca_dev *gspca_dev = priv;
861         int mode;
862
863         mode = gspca_dev->curr_mode;
864         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
865                 sizeof fmt->fmt.pix);
866         return 0;
867 }
868
869 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
870                         struct v4l2_format *fmt)
871 {
872         int w, h, mode, mode2;
873
874         w = fmt->fmt.pix.width;
875         h = fmt->fmt.pix.height;
876
877 #ifdef GSPCA_DEBUG
878         if (gspca_debug & D_CONF)
879                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
880 #endif
881         /* search the closest mode for width and height */
882         mode = wxh_to_mode(gspca_dev, w, h);
883
884         /* OK if right palette */
885         if (gspca_dev->cam.cam_mode[mode].pixelformat
886                                                 != fmt->fmt.pix.pixelformat) {
887
888                 /* else, search the closest mode with the same pixel format */
889                 mode2 = gspca_get_mode(gspca_dev, mode,
890                                         fmt->fmt.pix.pixelformat);
891                 if (mode2 >= 0)
892                         mode = mode2;
893 /*              else
894                         ;                * no chance, return this mode */
895         }
896         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
897                 sizeof fmt->fmt.pix);
898         return mode;                    /* used when s_fmt */
899 }
900
901 static int vidioc_try_fmt_vid_cap(struct file *file,
902                               void *priv,
903                               struct v4l2_format *fmt)
904 {
905         struct gspca_dev *gspca_dev = priv;
906         int ret;
907
908         ret = try_fmt_vid_cap(gspca_dev, fmt);
909         if (ret < 0)
910                 return ret;
911         return 0;
912 }
913
914 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
915                             struct v4l2_format *fmt)
916 {
917         struct gspca_dev *gspca_dev = priv;
918         int ret;
919
920         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
921                 return -ERESTARTSYS;
922
923         ret = try_fmt_vid_cap(gspca_dev, fmt);
924         if (ret < 0)
925                 goto out;
926
927         if (gspca_dev->nframes != 0
928             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
929                 ret = -EINVAL;
930                 goto out;
931         }
932
933         if (ret == gspca_dev->curr_mode) {
934                 ret = 0;
935                 goto out;                       /* same mode */
936         }
937
938         if (gspca_dev->streaming) {
939                 ret = -EBUSY;
940                 goto out;
941         }
942         gspca_dev->width = fmt->fmt.pix.width;
943         gspca_dev->height = fmt->fmt.pix.height;
944         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
945         gspca_dev->curr_mode = ret;
946
947         ret = 0;
948 out:
949         mutex_unlock(&gspca_dev->queue_lock);
950         return ret;
951 }
952
953 static int vidioc_enum_framesizes(struct file *file, void *priv,
954                                   struct v4l2_frmsizeenum *fsize)
955 {
956         struct gspca_dev *gspca_dev = priv;
957         int i;
958         __u32 index = 0;
959
960         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
961                 if (fsize->pixel_format !=
962                                 gspca_dev->cam.cam_mode[i].pixelformat)
963                         continue;
964
965                 if (fsize->index == index) {
966                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
967                         fsize->discrete.width =
968                                 gspca_dev->cam.cam_mode[i].width;
969                         fsize->discrete.height =
970                                 gspca_dev->cam.cam_mode[i].height;
971                         return 0;
972                 }
973                 index++;
974         }
975
976         return -EINVAL;
977 }
978
979 static void gspca_release(struct video_device *vfd)
980 {
981         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
982
983         PDEBUG(D_STREAM, "device released");
984
985         kfree(gspca_dev->usb_buf);
986         kfree(gspca_dev);
987 }
988
989 static int dev_open(struct file *file)
990 {
991         struct gspca_dev *gspca_dev;
992         int ret;
993
994         PDEBUG(D_STREAM, "%s open", current->comm);
995         gspca_dev = (struct gspca_dev *) video_devdata(file);
996         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
997                 return -ERESTARTSYS;
998         if (!gspca_dev->present) {
999                 ret = -ENODEV;
1000                 goto out;
1001         }
1002
1003         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1004                 ret = -EBUSY;
1005                 goto out;
1006         }
1007
1008         /* protect the subdriver against rmmod */
1009         if (!try_module_get(gspca_dev->module)) {
1010                 ret = -ENODEV;
1011                 goto out;
1012         }
1013
1014         gspca_dev->users++;
1015
1016         file->private_data = gspca_dev;
1017 #ifdef GSPCA_DEBUG
1018         /* activate the v4l2 debug */
1019         if (gspca_debug & D_V4L2)
1020                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1021                                         | V4L2_DEBUG_IOCTL_ARG;
1022         else
1023                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1024                                         | V4L2_DEBUG_IOCTL_ARG);
1025 #endif
1026         ret = 0;
1027 out:
1028         mutex_unlock(&gspca_dev->queue_lock);
1029         if (ret != 0)
1030                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1031         else
1032                 PDEBUG(D_STREAM, "open done");
1033         return ret;
1034 }
1035
1036 static int dev_close(struct file *file)
1037 {
1038         struct gspca_dev *gspca_dev = file->private_data;
1039
1040         PDEBUG(D_STREAM, "%s close", current->comm);
1041         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1042                 return -ERESTARTSYS;
1043         gspca_dev->users--;
1044
1045         /* if the file did the capture, free the streaming resources */
1046         if (gspca_dev->capt_file == file) {
1047                 if (gspca_dev->streaming) {
1048                         mutex_lock(&gspca_dev->usb_lock);
1049                         gspca_stream_off(gspca_dev);
1050                         mutex_unlock(&gspca_dev->usb_lock);
1051                 }
1052                 frame_free(gspca_dev);
1053                 gspca_dev->capt_file = NULL;
1054                 gspca_dev->memory = GSPCA_MEMORY_NO;
1055         }
1056         file->private_data = NULL;
1057         module_put(gspca_dev->module);
1058         mutex_unlock(&gspca_dev->queue_lock);
1059
1060         PDEBUG(D_STREAM, "close done");
1061
1062         return 0;
1063 }
1064
1065 static int vidioc_querycap(struct file *file, void  *priv,
1066                            struct v4l2_capability *cap)
1067 {
1068         struct gspca_dev *gspca_dev = priv;
1069         int ret;
1070
1071         /* protect the access to the usb device */
1072         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1073                 return -ERESTARTSYS;
1074         if (!gspca_dev->present) {
1075                 ret = -ENODEV;
1076                 goto out;
1077         }
1078         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1079         if (gspca_dev->dev->product != NULL) {
1080                 strncpy(cap->card, gspca_dev->dev->product,
1081                         sizeof cap->card);
1082         } else {
1083                 snprintf(cap->card, sizeof cap->card,
1084                         "USB Camera (%04x:%04x)",
1085                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1086                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1087         }
1088         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1089         cap->version = DRIVER_VERSION_NUMBER;
1090         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1091                           | V4L2_CAP_STREAMING
1092                           | V4L2_CAP_READWRITE;
1093         ret = 0;
1094 out:
1095         mutex_unlock(&gspca_dev->usb_lock);
1096         return ret;
1097 }
1098
1099 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1100                                    int id)
1101 {
1102         const struct ctrl *ctrls;
1103         int i;
1104
1105         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1106              i < gspca_dev->sd_desc->nctrls;
1107              i++, ctrls++) {
1108                 if (gspca_dev->ctrl_dis & (1 << i))
1109                         continue;
1110                 if (id == ctrls->qctrl.id)
1111                         return ctrls;
1112         }
1113         return NULL;
1114 }
1115
1116 static int vidioc_queryctrl(struct file *file, void *priv,
1117                            struct v4l2_queryctrl *q_ctrl)
1118 {
1119         struct gspca_dev *gspca_dev = priv;
1120         const struct ctrl *ctrls;
1121         int i;
1122         u32 id;
1123
1124         ctrls = NULL;
1125         id = q_ctrl->id;
1126         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1127                 id &= V4L2_CTRL_ID_MASK;
1128                 id++;
1129                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1130                         if (gspca_dev->ctrl_dis & (1 << i))
1131                                 continue;
1132                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1133                                 continue;
1134                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1135                                             > ctrls->qctrl.id)
1136                                 continue;
1137                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1138                 }
1139         } else {
1140                 ctrls = get_ctrl(gspca_dev, id);
1141         }
1142         if (ctrls == NULL)
1143                 return -EINVAL;
1144         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1145         return 0;
1146 }
1147
1148 static int vidioc_s_ctrl(struct file *file, void *priv,
1149                          struct v4l2_control *ctrl)
1150 {
1151         struct gspca_dev *gspca_dev = priv;
1152         const struct ctrl *ctrls;
1153         int ret;
1154
1155         ctrls = get_ctrl(gspca_dev, ctrl->id);
1156         if (ctrls == NULL)
1157                 return -EINVAL;
1158
1159         if (ctrl->value < ctrls->qctrl.minimum
1160             || ctrl->value > ctrls->qctrl.maximum)
1161                 return -ERANGE;
1162         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1163         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1164                 return -ERESTARTSYS;
1165         if (gspca_dev->present)
1166                 ret = ctrls->set(gspca_dev, ctrl->value);
1167         else
1168                 ret = -ENODEV;
1169         mutex_unlock(&gspca_dev->usb_lock);
1170         return ret;
1171 }
1172
1173 static int vidioc_g_ctrl(struct file *file, void *priv,
1174                          struct v4l2_control *ctrl)
1175 {
1176         struct gspca_dev *gspca_dev = priv;
1177         const struct ctrl *ctrls;
1178         int ret;
1179
1180         ctrls = get_ctrl(gspca_dev, ctrl->id);
1181         if (ctrls == NULL)
1182                 return -EINVAL;
1183
1184         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1185                 return -ERESTARTSYS;
1186         if (gspca_dev->present)
1187                 ret = ctrls->get(gspca_dev, &ctrl->value);
1188         else
1189                 ret = -ENODEV;
1190         mutex_unlock(&gspca_dev->usb_lock);
1191         return ret;
1192 }
1193
1194 /*fixme: have an audio flag in gspca_dev?*/
1195 static int vidioc_s_audio(struct file *file, void *priv,
1196                          struct v4l2_audio *audio)
1197 {
1198         if (audio->index != 0)
1199                 return -EINVAL;
1200         return 0;
1201 }
1202
1203 static int vidioc_g_audio(struct file *file, void *priv,
1204                          struct v4l2_audio *audio)
1205 {
1206         strcpy(audio->name, "Microphone");
1207         return 0;
1208 }
1209
1210 static int vidioc_enumaudio(struct file *file, void *priv,
1211                          struct v4l2_audio *audio)
1212 {
1213         if (audio->index != 0)
1214                 return -EINVAL;
1215
1216         strcpy(audio->name, "Microphone");
1217         audio->capability = 0;
1218         audio->mode = 0;
1219         return 0;
1220 }
1221
1222 static int vidioc_querymenu(struct file *file, void *priv,
1223                             struct v4l2_querymenu *qmenu)
1224 {
1225         struct gspca_dev *gspca_dev = priv;
1226
1227         if (!gspca_dev->sd_desc->querymenu)
1228                 return -EINVAL;
1229         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1230 }
1231
1232 static int vidioc_enum_input(struct file *file, void *priv,
1233                                 struct v4l2_input *input)
1234 {
1235         struct gspca_dev *gspca_dev = priv;
1236
1237         if (input->index != 0)
1238                 return -EINVAL;
1239         input->type = V4L2_INPUT_TYPE_CAMERA;
1240         input->status = gspca_dev->cam.input_flags;
1241         strncpy(input->name, gspca_dev->sd_desc->name,
1242                 sizeof input->name);
1243         return 0;
1244 }
1245
1246 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1247 {
1248         *i = 0;
1249         return 0;
1250 }
1251
1252 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1253 {
1254         if (i > 0)
1255                 return -EINVAL;
1256         return (0);
1257 }
1258
1259 static int vidioc_reqbufs(struct file *file, void *priv,
1260                           struct v4l2_requestbuffers *rb)
1261 {
1262         struct gspca_dev *gspca_dev = priv;
1263         int i, ret = 0;
1264
1265         switch (rb->memory) {
1266         case GSPCA_MEMORY_READ:                 /* (internal call) */
1267         case V4L2_MEMORY_MMAP:
1268         case V4L2_MEMORY_USERPTR:
1269                 break;
1270         default:
1271                 return -EINVAL;
1272         }
1273         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1274                 return -ERESTARTSYS;
1275
1276         if (gspca_dev->memory != GSPCA_MEMORY_NO
1277             && gspca_dev->memory != rb->memory) {
1278                 ret = -EBUSY;
1279                 goto out;
1280         }
1281
1282         /* only one file may do the capture */
1283         if (gspca_dev->capt_file != NULL
1284             && gspca_dev->capt_file != file) {
1285                 ret = -EBUSY;
1286                 goto out;
1287         }
1288
1289         /* if allocated, the buffers must not be mapped */
1290         for (i = 0; i < gspca_dev->nframes; i++) {
1291                 if (gspca_dev->frame[i].vma_use_count) {
1292                         ret = -EBUSY;
1293                         goto out;
1294                 }
1295         }
1296
1297         /* stop streaming */
1298         if (gspca_dev->streaming) {
1299                 mutex_lock(&gspca_dev->usb_lock);
1300                 gspca_stream_off(gspca_dev);
1301                 mutex_unlock(&gspca_dev->usb_lock);
1302         }
1303
1304         /* free the previous allocated buffers, if any */
1305         if (gspca_dev->nframes != 0) {
1306                 frame_free(gspca_dev);
1307                 gspca_dev->capt_file = NULL;
1308         }
1309         if (rb->count == 0)                     /* unrequest */
1310                 goto out;
1311         gspca_dev->memory = rb->memory;
1312         ret = frame_alloc(gspca_dev, rb->count);
1313         if (ret == 0) {
1314                 rb->count = gspca_dev->nframes;
1315                 gspca_dev->capt_file = file;
1316         }
1317 out:
1318         mutex_unlock(&gspca_dev->queue_lock);
1319         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1320         return ret;
1321 }
1322
1323 static int vidioc_querybuf(struct file *file, void *priv,
1324                            struct v4l2_buffer *v4l2_buf)
1325 {
1326         struct gspca_dev *gspca_dev = priv;
1327         struct gspca_frame *frame;
1328
1329         if (v4l2_buf->index < 0
1330             || v4l2_buf->index >= gspca_dev->nframes)
1331                 return -EINVAL;
1332
1333         frame = &gspca_dev->frame[v4l2_buf->index];
1334         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1335         return 0;
1336 }
1337
1338 static int vidioc_streamon(struct file *file, void *priv,
1339                            enum v4l2_buf_type buf_type)
1340 {
1341         struct gspca_dev *gspca_dev = priv;
1342         int ret;
1343
1344         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1345                 return -EINVAL;
1346         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1347                 return -ERESTARTSYS;
1348
1349         if (gspca_dev->nframes == 0
1350             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1351                 ret = -EINVAL;
1352                 goto out;
1353         }
1354         if (!gspca_dev->streaming) {
1355                 ret = gspca_init_transfer(gspca_dev);
1356                 if (ret < 0)
1357                         goto out;
1358         }
1359 #ifdef GSPCA_DEBUG
1360         if (gspca_debug & D_STREAM) {
1361                 PDEBUG_MODE("stream on OK",
1362                         gspca_dev->pixfmt,
1363                         gspca_dev->width,
1364                         gspca_dev->height);
1365         }
1366 #endif
1367         ret = 0;
1368 out:
1369         mutex_unlock(&gspca_dev->queue_lock);
1370         return ret;
1371 }
1372
1373 static int vidioc_streamoff(struct file *file, void *priv,
1374                                 enum v4l2_buf_type buf_type)
1375 {
1376         struct gspca_dev *gspca_dev = priv;
1377         int i, ret;
1378
1379         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1380                 return -EINVAL;
1381         if (!gspca_dev->streaming)
1382                 return 0;
1383         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1384                 return -ERESTARTSYS;
1385
1386         /* stop streaming */
1387         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1388                 ret = -ERESTARTSYS;
1389                 goto out;
1390         }
1391         gspca_stream_off(gspca_dev);
1392         mutex_unlock(&gspca_dev->usb_lock);
1393
1394         /* empty the application queues */
1395         for (i = 0; i < gspca_dev->nframes; i++)
1396                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1397         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1398         gspca_dev->last_packet_type = DISCARD_PACKET;
1399         gspca_dev->sequence = 0;
1400         ret = 0;
1401 out:
1402         mutex_unlock(&gspca_dev->queue_lock);
1403         return ret;
1404 }
1405
1406 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1407                         struct v4l2_jpegcompression *jpegcomp)
1408 {
1409         struct gspca_dev *gspca_dev = priv;
1410         int ret;
1411
1412         if (!gspca_dev->sd_desc->get_jcomp)
1413                 return -EINVAL;
1414         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1415                 return -ERESTARTSYS;
1416         if (gspca_dev->present)
1417                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1418         else
1419                 ret = -ENODEV;
1420         mutex_unlock(&gspca_dev->usb_lock);
1421         return ret;
1422 }
1423
1424 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1425                         struct v4l2_jpegcompression *jpegcomp)
1426 {
1427         struct gspca_dev *gspca_dev = priv;
1428         int ret;
1429
1430         if (!gspca_dev->sd_desc->set_jcomp)
1431                 return -EINVAL;
1432         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1433                 return -ERESTARTSYS;
1434         if (gspca_dev->present)
1435                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1436         else
1437                 ret = -ENODEV;
1438         mutex_unlock(&gspca_dev->usb_lock);
1439         return ret;
1440 }
1441
1442 static int vidioc_g_parm(struct file *filp, void *priv,
1443                         struct v4l2_streamparm *parm)
1444 {
1445         struct gspca_dev *gspca_dev = priv;
1446
1447         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1448
1449         if (gspca_dev->sd_desc->get_streamparm) {
1450                 int ret;
1451
1452                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1453                         return -ERESTARTSYS;
1454                 if (gspca_dev->present)
1455                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1456                                                                  parm);
1457                 else
1458                         ret = -ENODEV;
1459                 mutex_unlock(&gspca_dev->usb_lock);
1460                 return ret;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int vidioc_s_parm(struct file *filp, void *priv,
1467                         struct v4l2_streamparm *parm)
1468 {
1469         struct gspca_dev *gspca_dev = priv;
1470         int n;
1471
1472         n = parm->parm.capture.readbuffers;
1473         if (n == 0 || n > GSPCA_MAX_FRAMES)
1474                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1475         else
1476                 gspca_dev->nbufread = n;
1477
1478         if (gspca_dev->sd_desc->set_streamparm) {
1479                 int ret;
1480
1481                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1482                         return -ERESTARTSYS;
1483                 if (gspca_dev->present)
1484                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1485                                                                  parm);
1486                 else
1487                         ret = -ENODEV;
1488                 mutex_unlock(&gspca_dev->usb_lock);
1489                 return ret;
1490         }
1491
1492         return 0;
1493 }
1494
1495 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1496 static int vidiocgmbuf(struct file *file, void *priv,
1497                         struct video_mbuf *mbuf)
1498 {
1499         struct gspca_dev *gspca_dev = file->private_data;
1500         int i;
1501
1502         PDEBUG(D_STREAM, "cgmbuf");
1503         if (gspca_dev->nframes == 0) {
1504                 int ret;
1505
1506                 {
1507                         struct v4l2_format fmt;
1508
1509                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1510                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1511                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1512                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1513                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1514                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1515                         if (ret != 0)
1516                                 return ret;
1517                 }
1518                 {
1519                         struct v4l2_requestbuffers rb;
1520
1521                         memset(&rb, 0, sizeof rb);
1522                         rb.count = 4;
1523                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1524                         rb.memory = V4L2_MEMORY_MMAP;
1525                         ret = vidioc_reqbufs(file, priv, &rb);
1526                         if (ret != 0)
1527                                 return ret;
1528                 }
1529         }
1530         mbuf->frames = gspca_dev->nframes;
1531         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1532         for (i = 0; i < mbuf->frames; i++)
1533                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1534         return 0;
1535 }
1536 #endif
1537
1538 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1539 {
1540         struct gspca_dev *gspca_dev = file->private_data;
1541         struct gspca_frame *frame;
1542         struct page *page;
1543         unsigned long addr, start, size;
1544         int i, ret;
1545
1546         start = vma->vm_start;
1547         size = vma->vm_end - vma->vm_start;
1548         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1549
1550         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1551                 return -ERESTARTSYS;
1552         if (!gspca_dev->present) {
1553                 ret = -ENODEV;
1554                 goto out;
1555         }
1556         if (gspca_dev->capt_file != file) {
1557                 ret = -EINVAL;
1558                 goto out;
1559         }
1560
1561         frame = NULL;
1562         for (i = 0; i < gspca_dev->nframes; ++i) {
1563                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1564                         PDEBUG(D_STREAM, "mmap bad memory type");
1565                         break;
1566                 }
1567                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1568                                                 == vma->vm_pgoff) {
1569                         frame = &gspca_dev->frame[i];
1570                         break;
1571                 }
1572         }
1573         if (frame == NULL) {
1574                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1575                 ret = -EINVAL;
1576                 goto out;
1577         }
1578 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1579         /* v4l1 maps all the buffers */
1580         if (i != 0
1581             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1582 #endif
1583             if (size != frame->v4l2_buf.length) {
1584                 PDEBUG(D_STREAM, "mmap bad size");
1585                 ret = -EINVAL;
1586                 goto out;
1587         }
1588
1589         /*
1590          * - VM_IO marks the area as being a mmaped region for I/O to a
1591          *   device. It also prevents the region from being core dumped.
1592          */
1593         vma->vm_flags |= VM_IO;
1594
1595         addr = (unsigned long) frame->data;
1596         while (size > 0) {
1597                 page = vmalloc_to_page((void *) addr);
1598                 ret = vm_insert_page(vma, start, page);
1599                 if (ret < 0)
1600                         goto out;
1601                 start += PAGE_SIZE;
1602                 addr += PAGE_SIZE;
1603                 size -= PAGE_SIZE;
1604         }
1605
1606         vma->vm_ops = &gspca_vm_ops;
1607         vma->vm_private_data = frame;
1608         gspca_vm_open(vma);
1609         ret = 0;
1610 out:
1611         mutex_unlock(&gspca_dev->queue_lock);
1612         return ret;
1613 }
1614
1615 /*
1616  * wait for a video frame
1617  *
1618  * If a frame is ready, its index is returned.
1619  */
1620 static int frame_wait(struct gspca_dev *gspca_dev,
1621                         int nonblock_ing)
1622 {
1623         struct gspca_frame *frame;
1624         int i, j, ret;
1625
1626         /* check if a frame is ready */
1627         i = gspca_dev->fr_o;
1628         j = gspca_dev->fr_queue[i];
1629         frame = &gspca_dev->frame[j];
1630
1631         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1632                 if (nonblock_ing)
1633                         return -EAGAIN;
1634
1635                 /* wait till a frame is ready */
1636                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1637                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1638                         !gspca_dev->streaming || !gspca_dev->present,
1639                         msecs_to_jiffies(3000));
1640                 if (ret < 0)
1641                         return ret;
1642                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1643                         return -EIO;
1644         }
1645
1646         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1647         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1648                 gspca_dev->fr_q,
1649                 gspca_dev->fr_i,
1650                 gspca_dev->fr_o);
1651
1652         if (gspca_dev->sd_desc->dq_callback) {
1653                 mutex_lock(&gspca_dev->usb_lock);
1654                 if (gspca_dev->present)
1655                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1656                 mutex_unlock(&gspca_dev->usb_lock);
1657         }
1658         return j;
1659 }
1660
1661 /*
1662  * dequeue a video buffer
1663  *
1664  * If nonblock_ing is false, block until a buffer is available.
1665  */
1666 static int vidioc_dqbuf(struct file *file, void *priv,
1667                         struct v4l2_buffer *v4l2_buf)
1668 {
1669         struct gspca_dev *gspca_dev = priv;
1670         struct gspca_frame *frame;
1671         int i, ret;
1672
1673         PDEBUG(D_FRAM, "dqbuf");
1674         if (v4l2_buf->memory != gspca_dev->memory)
1675                 return -EINVAL;
1676
1677         if (!gspca_dev->present)
1678                 return -ENODEV;
1679
1680         /* if not streaming, be sure the application will not loop forever */
1681         if (!(file->f_flags & O_NONBLOCK)
1682             && !gspca_dev->streaming && gspca_dev->users == 1)
1683                 return -EINVAL;
1684
1685         /* only the capturing file may dequeue */
1686         if (gspca_dev->capt_file != file)
1687                 return -EINVAL;
1688
1689         /* only one dequeue / read at a time */
1690         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1691                 return -ERESTARTSYS;
1692
1693         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1694         if (ret < 0)
1695                 goto out;
1696         i = ret;                                /* frame index */
1697         frame = &gspca_dev->frame[i];
1698         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1699                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1700                                  frame->data,
1701                                  frame->v4l2_buf.bytesused)) {
1702                         PDEBUG(D_ERR|D_STREAM,
1703                                 "dqbuf cp to user failed");
1704                         ret = -EFAULT;
1705                         goto out;
1706                 }
1707         }
1708         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1709         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1710         PDEBUG(D_FRAM, "dqbuf %d", i);
1711         ret = 0;
1712 out:
1713         mutex_unlock(&gspca_dev->read_lock);
1714         return ret;
1715 }
1716
1717 /*
1718  * queue a video buffer
1719  *
1720  * Attempting to queue a buffer that has already been
1721  * queued will return -EINVAL.
1722  */
1723 static int vidioc_qbuf(struct file *file, void *priv,
1724                         struct v4l2_buffer *v4l2_buf)
1725 {
1726         struct gspca_dev *gspca_dev = priv;
1727         struct gspca_frame *frame;
1728         int i, index, ret;
1729
1730         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1731
1732         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1733                 return -ERESTARTSYS;
1734
1735         index = v4l2_buf->index;
1736         if ((unsigned) index >= gspca_dev->nframes) {
1737                 PDEBUG(D_FRAM,
1738                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1739                 ret = -EINVAL;
1740                 goto out;
1741         }
1742         if (v4l2_buf->memory != gspca_dev->memory) {
1743                 PDEBUG(D_FRAM, "qbuf bad memory type");
1744                 ret = -EINVAL;
1745                 goto out;
1746         }
1747
1748         frame = &gspca_dev->frame[index];
1749         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1750                 PDEBUG(D_FRAM, "qbuf bad state");
1751                 ret = -EINVAL;
1752                 goto out;
1753         }
1754
1755         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1756
1757         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1758                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1759                 frame->v4l2_buf.length = v4l2_buf->length;
1760         }
1761
1762         /* put the buffer in the 'queued' queue */
1763         i = gspca_dev->fr_q;
1764         gspca_dev->fr_queue[i] = index;
1765         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1766         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1767                 gspca_dev->fr_q,
1768                 gspca_dev->fr_i,
1769                 gspca_dev->fr_o);
1770
1771         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1772         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1773         ret = 0;
1774 out:
1775         mutex_unlock(&gspca_dev->queue_lock);
1776         return ret;
1777 }
1778
1779 /*
1780  * allocate the resources for read()
1781  */
1782 static int read_alloc(struct gspca_dev *gspca_dev,
1783                         struct file *file)
1784 {
1785         struct v4l2_buffer v4l2_buf;
1786         int i, ret;
1787
1788         PDEBUG(D_STREAM, "read alloc");
1789         if (gspca_dev->nframes == 0) {
1790                 struct v4l2_requestbuffers rb;
1791
1792                 memset(&rb, 0, sizeof rb);
1793                 rb.count = gspca_dev->nbufread;
1794                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1795                 rb.memory = GSPCA_MEMORY_READ;
1796                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1797                 if (ret != 0) {
1798                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1799                         return ret;
1800                 }
1801                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1802                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1803                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1804                 for (i = 0; i < gspca_dev->nbufread; i++) {
1805                         v4l2_buf.index = i;
1806                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1807                         if (ret != 0) {
1808                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1809                                 return ret;
1810                         }
1811                 }
1812                 gspca_dev->memory = GSPCA_MEMORY_READ;
1813         }
1814
1815         /* start streaming */
1816         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1817         if (ret != 0)
1818                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1819         return ret;
1820 }
1821
1822 static unsigned int dev_poll(struct file *file, poll_table *wait)
1823 {
1824         struct gspca_dev *gspca_dev = file->private_data;
1825         int i, ret;
1826
1827         PDEBUG(D_FRAM, "poll");
1828
1829         poll_wait(file, &gspca_dev->wq, wait);
1830
1831         /* if reqbufs is not done, the user would use read() */
1832         if (gspca_dev->nframes == 0) {
1833                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1834                         return POLLERR;         /* not the 1st time */
1835                 ret = read_alloc(gspca_dev, file);
1836                 if (ret != 0)
1837                         return POLLERR;
1838         }
1839
1840         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1841                 return POLLERR;
1842
1843         /* check the next incoming buffer */
1844         i = gspca_dev->fr_o;
1845         i = gspca_dev->fr_queue[i];
1846         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1847                 ret = POLLIN | POLLRDNORM;      /* something to read */
1848         else
1849                 ret = 0;
1850         mutex_unlock(&gspca_dev->queue_lock);
1851         if (!gspca_dev->present)
1852                 return POLLHUP;
1853         return ret;
1854 }
1855
1856 static ssize_t dev_read(struct file *file, char __user *data,
1857                     size_t count, loff_t *ppos)
1858 {
1859         struct gspca_dev *gspca_dev = file->private_data;
1860         struct gspca_frame *frame;
1861         struct v4l2_buffer v4l2_buf;
1862         struct timeval timestamp;
1863         int n, ret, ret2;
1864
1865         PDEBUG(D_FRAM, "read (%zd)", count);
1866         if (!gspca_dev->present)
1867                 return -ENODEV;
1868         switch (gspca_dev->memory) {
1869         case GSPCA_MEMORY_NO:                   /* first time */
1870                 ret = read_alloc(gspca_dev, file);
1871                 if (ret != 0)
1872                         return ret;
1873                 break;
1874         case GSPCA_MEMORY_READ:
1875                 if (gspca_dev->capt_file == file)
1876                         break;
1877                 /* fall thru */
1878         default:
1879                 return -EINVAL;
1880         }
1881
1882         /* get a frame */
1883         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1884         timestamp.tv_sec--;
1885         n = 2;
1886         for (;;) {
1887                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1888                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1889                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1890                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1891                 if (ret != 0) {
1892                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1893                         return ret;
1894                 }
1895
1896                 /* if the process slept for more than 1 second,
1897                  * get a newer frame */
1898                 frame = &gspca_dev->frame[v4l2_buf.index];
1899                 if (--n < 0)
1900                         break;                  /* avoid infinite loop */
1901                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1902                         break;
1903                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1904                 if (ret != 0) {
1905                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1906                         return ret;
1907                 }
1908         }
1909
1910         /* copy the frame */
1911         if (count > frame->v4l2_buf.bytesused)
1912                 count = frame->v4l2_buf.bytesused;
1913         ret = copy_to_user(data, frame->data, count);
1914         if (ret != 0) {
1915                 PDEBUG(D_ERR|D_STREAM,
1916                         "read cp to user lack %d / %zd", ret, count);
1917                 ret = -EFAULT;
1918                 goto out;
1919         }
1920         ret = count;
1921 out:
1922         /* in each case, requeue the buffer */
1923         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1924         if (ret2 != 0)
1925                 return ret2;
1926         return ret;
1927 }
1928
1929 static struct v4l2_file_operations dev_fops = {
1930         .owner = THIS_MODULE,
1931         .open = dev_open,
1932         .release = dev_close,
1933         .read = dev_read,
1934         .mmap = dev_mmap,
1935         .unlocked_ioctl = video_ioctl2,
1936         .poll   = dev_poll,
1937 };
1938
1939 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1940         .vidioc_querycap        = vidioc_querycap,
1941         .vidioc_dqbuf           = vidioc_dqbuf,
1942         .vidioc_qbuf            = vidioc_qbuf,
1943         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1944         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1945         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1946         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1947         .vidioc_streamon        = vidioc_streamon,
1948         .vidioc_queryctrl       = vidioc_queryctrl,
1949         .vidioc_g_ctrl          = vidioc_g_ctrl,
1950         .vidioc_s_ctrl          = vidioc_s_ctrl,
1951         .vidioc_g_audio         = vidioc_g_audio,
1952         .vidioc_s_audio         = vidioc_s_audio,
1953         .vidioc_enumaudio       = vidioc_enumaudio,
1954         .vidioc_querymenu       = vidioc_querymenu,
1955         .vidioc_enum_input      = vidioc_enum_input,
1956         .vidioc_g_input         = vidioc_g_input,
1957         .vidioc_s_input         = vidioc_s_input,
1958         .vidioc_reqbufs         = vidioc_reqbufs,
1959         .vidioc_querybuf        = vidioc_querybuf,
1960         .vidioc_streamoff       = vidioc_streamoff,
1961         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1962         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1963         .vidioc_g_parm          = vidioc_g_parm,
1964         .vidioc_s_parm          = vidioc_s_parm,
1965         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1966 #ifdef CONFIG_VIDEO_ADV_DEBUG
1967         .vidioc_g_register      = vidioc_g_register,
1968         .vidioc_s_register      = vidioc_s_register,
1969 #endif
1970         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1971 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1972         .vidiocgmbuf          = vidiocgmbuf,
1973 #endif
1974 };
1975
1976 static struct video_device gspca_template = {
1977         .name = "gspca main driver",
1978         .fops = &dev_fops,
1979         .ioctl_ops = &dev_ioctl_ops,
1980         .release = gspca_release,
1981         .minor = -1,
1982 };
1983
1984 /*
1985  * probe and create a new gspca device
1986  *
1987  * This function must be called by the sub-driver when it is
1988  * called for probing a new device.
1989  */
1990 int gspca_dev_probe(struct usb_interface *intf,
1991                 const struct usb_device_id *id,
1992                 const struct sd_desc *sd_desc,
1993                 int dev_size,
1994                 struct module *module)
1995 {
1996         struct usb_interface_descriptor *interface;
1997         struct gspca_dev *gspca_dev;
1998         struct usb_device *dev = interface_to_usbdev(intf);
1999         int ret;
2000
2001         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2002
2003         /* we don't handle multi-config cameras */
2004         if (dev->descriptor.bNumConfigurations != 1)
2005                 return -ENODEV;
2006         interface = &intf->cur_altsetting->desc;
2007         if (interface->bInterfaceNumber > 0)
2008                 return -ENODEV;
2009
2010         /* create the device */
2011         if (dev_size < sizeof *gspca_dev)
2012                 dev_size = sizeof *gspca_dev;
2013         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2014         if (!gspca_dev) {
2015                 err("couldn't kzalloc gspca struct");
2016                 return -ENOMEM;
2017         }
2018         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2019         if (!gspca_dev->usb_buf) {
2020                 err("out of memory");
2021                 ret = -ENOMEM;
2022                 goto out;
2023         }
2024         gspca_dev->dev = dev;
2025         gspca_dev->iface = interface->bInterfaceNumber;
2026         gspca_dev->nbalt = intf->num_altsetting;
2027         gspca_dev->sd_desc = sd_desc;
2028         gspca_dev->nbufread = 2;
2029         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2030
2031         /* configure the subdriver and initialize the USB device */
2032         ret = sd_desc->config(gspca_dev, id);
2033         if (ret < 0)
2034                 goto out;
2035         ret = sd_desc->init(gspca_dev);
2036         if (ret < 0)
2037                 goto out;
2038         ret = gspca_set_alt0(gspca_dev);
2039         if (ret < 0)
2040                 goto out;
2041         gspca_set_default_mode(gspca_dev);
2042
2043         mutex_init(&gspca_dev->usb_lock);
2044         mutex_init(&gspca_dev->read_lock);
2045         mutex_init(&gspca_dev->queue_lock);
2046         init_waitqueue_head(&gspca_dev->wq);
2047
2048         /* init video stuff */
2049         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2050         gspca_dev->vdev.parent = &intf->dev;
2051         gspca_dev->module = module;
2052         gspca_dev->present = 1;
2053         ret = video_register_device(&gspca_dev->vdev,
2054                                   VFL_TYPE_GRABBER,
2055                                   -1);
2056         if (ret < 0) {
2057                 err("video_register_device err %d", ret);
2058                 goto out;
2059         }
2060
2061         usb_set_intfdata(intf, gspca_dev);
2062         PDEBUG(D_PROBE, "probe ok");
2063         return 0;
2064 out:
2065         kfree(gspca_dev->usb_buf);
2066         kfree(gspca_dev);
2067         return ret;
2068 }
2069 EXPORT_SYMBOL(gspca_dev_probe);
2070
2071 /*
2072  * USB disconnection
2073  *
2074  * This function must be called by the sub-driver
2075  * when the device disconnects, after the specific resources are freed.
2076  */
2077 void gspca_disconnect(struct usb_interface *intf)
2078 {
2079         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2080
2081         mutex_lock(&gspca_dev->usb_lock);
2082         gspca_dev->present = 0;
2083
2084         if (gspca_dev->streaming) {
2085                 destroy_urbs(gspca_dev);
2086                 wake_up_interruptible(&gspca_dev->wq);
2087         }
2088
2089         /* the device is freed at exit of this function */
2090         gspca_dev->dev = NULL;
2091         mutex_unlock(&gspca_dev->usb_lock);
2092
2093         usb_set_intfdata(intf, NULL);
2094
2095         /* release the device */
2096         /* (this will call gspca_release() immediatly or on last close) */
2097         video_unregister_device(&gspca_dev->vdev);
2098
2099         PDEBUG(D_PROBE, "disconnect complete");
2100 }
2101 EXPORT_SYMBOL(gspca_disconnect);
2102
2103 #ifdef CONFIG_PM
2104 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2105 {
2106         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2107
2108         if (!gspca_dev->streaming)
2109                 return 0;
2110         gspca_dev->frozen = 1;          /* avoid urb error messages */
2111         if (gspca_dev->sd_desc->stopN)
2112                 gspca_dev->sd_desc->stopN(gspca_dev);
2113         destroy_urbs(gspca_dev);
2114         gspca_set_alt0(gspca_dev);
2115         if (gspca_dev->sd_desc->stop0)
2116                 gspca_dev->sd_desc->stop0(gspca_dev);
2117         return 0;
2118 }
2119 EXPORT_SYMBOL(gspca_suspend);
2120
2121 int gspca_resume(struct usb_interface *intf)
2122 {
2123         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2124
2125         gspca_dev->frozen = 0;
2126         gspca_dev->sd_desc->init(gspca_dev);
2127         if (gspca_dev->streaming)
2128                 return gspca_init_transfer(gspca_dev);
2129         return 0;
2130 }
2131 EXPORT_SYMBOL(gspca_resume);
2132 #endif
2133 /* -- cam driver utility functions -- */
2134
2135 /* auto gain and exposure algorithm based on the knee algorithm described here:
2136    http://ytse.tricolour.net/docs/LowLightOptimization.html
2137
2138    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2139    where changed. */
2140 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2141         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2142 {
2143         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2144         const struct ctrl *gain_ctrl = NULL;
2145         const struct ctrl *exposure_ctrl = NULL;
2146         const struct ctrl *autogain_ctrl = NULL;
2147         int retval = 0;
2148
2149         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2150                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2151                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2152                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2153                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2154                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2155                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2156         }
2157         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2158                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2159                         "on cam without (auto)gain/exposure");
2160                 return 0;
2161         }
2162
2163         if (gain_ctrl->get(gspca_dev, &gain) ||
2164                         exposure_ctrl->get(gspca_dev, &exposure) ||
2165                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2166                 return 0;
2167
2168         orig_gain = gain;
2169         orig_exposure = exposure;
2170
2171         /* If we are of a multiple of deadzone, do multiple steps to reach the
2172            desired lumination fast (with the risc of a slight overshoot) */
2173         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2174
2175         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2176                 avg_lum, desired_avg_lum, steps);
2177
2178         for (i = 0; i < steps; i++) {
2179                 if (avg_lum > desired_avg_lum) {
2180                         if (gain > gain_knee)
2181                                 gain--;
2182                         else if (exposure > exposure_knee)
2183                                 exposure--;
2184                         else if (gain > gain_ctrl->qctrl.default_value)
2185                                 gain--;
2186                         else if (exposure > exposure_ctrl->qctrl.minimum)
2187                                 exposure--;
2188                         else if (gain > gain_ctrl->qctrl.minimum)
2189                                 gain--;
2190                         else
2191                                 break;
2192                 } else {
2193                         if (gain < gain_ctrl->qctrl.default_value)
2194                                 gain++;
2195                         else if (exposure < exposure_knee)
2196                                 exposure++;
2197                         else if (gain < gain_knee)
2198                                 gain++;
2199                         else if (exposure < exposure_ctrl->qctrl.maximum)
2200                                 exposure++;
2201                         else if (gain < gain_ctrl->qctrl.maximum)
2202                                 gain++;
2203                         else
2204                                 break;
2205                 }
2206         }
2207
2208         if (gain != orig_gain) {
2209                 gain_ctrl->set(gspca_dev, gain);
2210                 retval = 1;
2211         }
2212         if (exposure != orig_exposure) {
2213                 exposure_ctrl->set(gspca_dev, exposure);
2214                 retval = 1;
2215         }
2216
2217         return retval;
2218 }
2219 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2220
2221 /* -- module insert / remove -- */
2222 static int __init gspca_init(void)
2223 {
2224         info("main v%d.%d.%d registered",
2225                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2226                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2227                 DRIVER_VERSION_NUMBER & 0xff);
2228         return 0;
2229 }
2230 static void __exit gspca_exit(void)
2231 {
2232         info("main deregistered");
2233 }
2234
2235 module_init(gspca_init);
2236 module_exit(gspca_exit);
2237
2238 #ifdef GSPCA_DEBUG
2239 module_param_named(debug, gspca_debug, int, 0644);
2240 MODULE_PARM_DESC(debug,
2241                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2242                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2243                 " 0x0100: v4l2");
2244 #endif