Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6] / drivers / media / video / gspca / gspca.c
1 /*
2  * Main USB camera driver
3  *
4  * V4L2 by 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 2             /* default number of URBs */
42
43 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
44 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
45 MODULE_LICENSE("GPL");
46
47 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 4, 0)
48
49 static int video_nr = -1;
50
51 #ifdef GSPCA_DEBUG
52 int gspca_debug = D_ERR | D_PROBE;
53 EXPORT_SYMBOL(gspca_debug);
54
55 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
56 {
57         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
58                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
59                         txt,
60                         pixfmt & 0xff,
61                         (pixfmt >> 8) & 0xff,
62                         (pixfmt >> 16) & 0xff,
63                         pixfmt >> 24,
64                         w, h);
65         } else {
66                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
67                         txt,
68                         pixfmt,
69                         w, h);
70         }
71 }
72 #else
73 #define PDEBUG_MODE(txt, pixfmt, w, h)
74 #endif
75
76 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
77 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
78 #define GSPCA_MEMORY_READ 7
79
80 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
81
82 /*
83  * VMA operations.
84  */
85 static void gspca_vm_open(struct vm_area_struct *vma)
86 {
87         struct gspca_frame *frame = vma->vm_private_data;
88
89         frame->vma_use_count++;
90         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
91 }
92
93 static void gspca_vm_close(struct vm_area_struct *vma)
94 {
95         struct gspca_frame *frame = vma->vm_private_data;
96
97         if (--frame->vma_use_count <= 0)
98                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
99 }
100
101 static struct vm_operations_struct gspca_vm_ops = {
102         .open           = gspca_vm_open,
103         .close          = gspca_vm_close,
104 };
105
106 /* get the current input frame buffer */
107 struct gspca_frame *gspca_get_i_frame(struct gspca_dev *gspca_dev)
108 {
109         struct gspca_frame *frame;
110         int i;
111
112         i = gspca_dev->fr_i;
113         i = gspca_dev->fr_queue[i];
114         frame = &gspca_dev->frame[i];
115         if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
116                                 != V4L2_BUF_FLAG_QUEUED)
117                 return NULL;
118         return frame;
119 }
120 EXPORT_SYMBOL(gspca_get_i_frame);
121
122 /*
123  * fill a video frame from an URB and resubmit
124  */
125 static void fill_frame(struct gspca_dev *gspca_dev,
126                         struct urb *urb)
127 {
128         struct gspca_frame *frame;
129         __u8 *data;             /* address of data in the iso message */
130         int i, len, st;
131         cam_pkt_op pkt_scan;
132
133         if (urb->status != 0) {
134 #ifdef CONFIG_PM
135                 if (!gspca_dev->frozen)
136 #endif
137                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
138                 return;         /* disconnection ? */
139         }
140         pkt_scan = gspca_dev->sd_desc->pkt_scan;
141         for (i = 0; i < urb->number_of_packets; i++) {
142
143                 /* check the availability of the frame buffer */
144                 frame = gspca_get_i_frame(gspca_dev);
145                 if (!frame) {
146                         gspca_dev->last_packet_type = DISCARD_PACKET;
147                         break;
148                 }
149
150                 /* check the packet status and length */
151                 len = urb->iso_frame_desc[i].actual_length;
152                 if (len == 0) {
153                         if (gspca_dev->empty_packet == 0)
154                                 gspca_dev->empty_packet = 1;
155                         continue;
156                 }
157                 st = urb->iso_frame_desc[i].status;
158                 if (st) {
159                         PDEBUG(D_ERR,
160                                 "ISOC data error: [%d] len=%d, status=%d",
161                                 i, len, st);
162                         gspca_dev->last_packet_type = DISCARD_PACKET;
163                         continue;
164                 }
165
166                 /* let the packet be analyzed by the subdriver */
167                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
168                         i, urb->iso_frame_desc[i].offset, len);
169                 data = (__u8 *) urb->transfer_buffer
170                                         + urb->iso_frame_desc[i].offset;
171                 pkt_scan(gspca_dev, frame, data, len);
172         }
173
174         /* resubmit the URB */
175         st = usb_submit_urb(urb, GFP_ATOMIC);
176         if (st < 0)
177                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
178 }
179
180 /*
181  * ISOC message interrupt from the USB device
182  *
183  * Analyse each packet and call the subdriver for copy to the frame buffer.
184  */
185 static void isoc_irq(struct urb *urb
186 )
187 {
188         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
189
190         PDEBUG(D_PACK, "isoc irq");
191         if (!gspca_dev->streaming)
192                 return;
193         fill_frame(gspca_dev, urb);
194 }
195
196 /*
197  * bulk message interrupt from the USB device
198  */
199 static void bulk_irq(struct urb *urb
200 )
201 {
202         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
203         struct gspca_frame *frame;
204         int st;
205
206         PDEBUG(D_PACK, "bulk irq");
207         if (!gspca_dev->streaming)
208                 return;
209         switch (urb->status) {
210         case 0:
211                 break;
212         case -ECONNRESET:
213                 urb->status = 0;
214                 break;
215         default:
216 #ifdef CONFIG_PM
217                 if (!gspca_dev->frozen)
218 #endif
219                         PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
220                 return;         /* disconnection ? */
221         }
222
223         /* check the availability of the frame buffer */
224         frame = gspca_get_i_frame(gspca_dev);
225         if (!frame) {
226                 gspca_dev->last_packet_type = DISCARD_PACKET;
227         } else {
228                 PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
229                 gspca_dev->sd_desc->pkt_scan(gspca_dev,
230                                         frame,
231                                         urb->transfer_buffer,
232                                         urb->actual_length);
233         }
234
235         /* resubmit the URB */
236         if (gspca_dev->cam.bulk_nurbs != 0) {
237                 st = usb_submit_urb(urb, GFP_ATOMIC);
238                 if (st < 0)
239                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
240         }
241 }
242
243 /*
244  * add data to the current frame
245  *
246  * This function is called by the subdrivers at interrupt level.
247  *
248  * To build a frame, these ones must add
249  *      - one FIRST_PACKET
250  *      - 0 or many INTER_PACKETs
251  *      - one LAST_PACKET
252  * DISCARD_PACKET invalidates the whole frame.
253  * On LAST_PACKET, a new frame is returned.
254  */
255 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
256                                     enum gspca_packet_type packet_type,
257                                     struct gspca_frame *frame,
258                                     const __u8 *data,
259                                     int len)
260 {
261         int i, j;
262
263         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
264
265         /* when start of a new frame, if the current frame buffer
266          * is not queued, discard the whole frame */
267         if (packet_type == FIRST_PACKET) {
268                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
269                                                 != V4L2_BUF_FLAG_QUEUED) {
270                         gspca_dev->last_packet_type = DISCARD_PACKET;
271                         return frame;
272                 }
273                 frame->data_end = frame->data;
274                 jiffies_to_timeval(get_jiffies_64(),
275                                    &frame->v4l2_buf.timestamp);
276                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
277         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
278                 if (packet_type == LAST_PACKET)
279                         gspca_dev->last_packet_type = packet_type;
280                 return frame;
281         }
282
283         /* append the packet to the frame buffer */
284         if (len > 0) {
285                 if (frame->data_end - frame->data + len
286                                                  > frame->v4l2_buf.length) {
287                         PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d",
288                                 frame->data_end - frame->data + len,
289                                 frame->v4l2_buf.length);
290                         packet_type = DISCARD_PACKET;
291                 } else {
292                         memcpy(frame->data_end, data, len);
293                         frame->data_end += len;
294                 }
295         }
296         gspca_dev->last_packet_type = packet_type;
297
298         /* if last packet, wake up the application and advance in the queue */
299         if (packet_type == LAST_PACKET) {
300                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
301                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
302                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
303                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
304                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
305                 gspca_dev->fr_i = i;
306                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
307                         frame->v4l2_buf.bytesused,
308                         gspca_dev->fr_q,
309                         i,
310                         gspca_dev->fr_o);
311                 j = gspca_dev->fr_queue[i];
312                 frame = &gspca_dev->frame[j];
313         }
314         return frame;
315 }
316 EXPORT_SYMBOL(gspca_frame_add);
317
318 static int gspca_is_compressed(__u32 format)
319 {
320         switch (format) {
321         case V4L2_PIX_FMT_MJPEG:
322         case V4L2_PIX_FMT_JPEG:
323         case V4L2_PIX_FMT_SPCA561:
324         case V4L2_PIX_FMT_PAC207:
325                 return 1;
326         }
327         return 0;
328 }
329
330 static void *rvmalloc(unsigned long size)
331 {
332         void *mem;
333         unsigned long adr;
334
335         mem = vmalloc_32(size);
336         if (mem != NULL) {
337                 adr = (unsigned long) mem;
338                 while ((long) size > 0) {
339                         SetPageReserved(vmalloc_to_page((void *) adr));
340                         adr += PAGE_SIZE;
341                         size -= PAGE_SIZE;
342                 }
343         }
344         return mem;
345 }
346
347 static void rvfree(void *mem, long size)
348 {
349         unsigned long adr;
350
351         adr = (unsigned long) mem;
352         while (size > 0) {
353                 ClearPageReserved(vmalloc_to_page((void *) adr));
354                 adr += PAGE_SIZE;
355                 size -= PAGE_SIZE;
356         }
357         vfree(mem);
358 }
359
360 static int frame_alloc(struct gspca_dev *gspca_dev,
361                         unsigned int count)
362 {
363         struct gspca_frame *frame;
364         unsigned int frsz;
365         int i;
366
367         i = gspca_dev->curr_mode;
368         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
369         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
370         frsz = PAGE_ALIGN(frsz);
371         gspca_dev->frsz = frsz;
372         if (count > GSPCA_MAX_FRAMES)
373                 count = GSPCA_MAX_FRAMES;
374         gspca_dev->frbuf = rvmalloc(frsz * count);
375         if (!gspca_dev->frbuf) {
376                 err("frame alloc failed");
377                 return -ENOMEM;
378         }
379         gspca_dev->nframes = count;
380         for (i = 0; i < count; i++) {
381                 frame = &gspca_dev->frame[i];
382                 frame->v4l2_buf.index = i;
383                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
384                 frame->v4l2_buf.flags = 0;
385                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
386                 frame->v4l2_buf.length = frsz;
387                 frame->v4l2_buf.memory = gspca_dev->memory;
388                 frame->v4l2_buf.sequence = 0;
389                 frame->data = frame->data_end =
390                                         gspca_dev->frbuf + i * frsz;
391                 frame->v4l2_buf.m.offset = i * frsz;
392         }
393         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
394         gspca_dev->last_packet_type = DISCARD_PACKET;
395         gspca_dev->sequence = 0;
396         return 0;
397 }
398
399 static void frame_free(struct gspca_dev *gspca_dev)
400 {
401         int i;
402
403         PDEBUG(D_STREAM, "frame free");
404         if (gspca_dev->frbuf != NULL) {
405                 rvfree(gspca_dev->frbuf,
406                         gspca_dev->nframes * gspca_dev->frsz);
407                 gspca_dev->frbuf = NULL;
408                 for (i = 0; i < gspca_dev->nframes; i++)
409                         gspca_dev->frame[i].data = NULL;
410         }
411         gspca_dev->nframes = 0;
412 }
413
414 static void destroy_urbs(struct gspca_dev *gspca_dev)
415 {
416         struct urb *urb;
417         unsigned int i;
418
419         PDEBUG(D_STREAM, "kill transfer");
420         for (i = 0; i < MAX_NURBS; i++) {
421                 urb = gspca_dev->urb[i];
422                 if (urb == NULL)
423                         break;
424
425                 gspca_dev->urb[i] = NULL;
426                 if (!gspca_dev->present)
427                         usb_kill_urb(urb);
428                 if (urb->transfer_buffer != NULL)
429                         usb_buffer_free(gspca_dev->dev,
430                                         urb->transfer_buffer_length,
431                                         urb->transfer_buffer,
432                                         urb->transfer_dma);
433                 usb_free_urb(urb);
434         }
435 }
436
437 /*
438  * look for an input transfer endpoint in an alternate setting
439  */
440 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
441                                           __u8 epaddr,
442                                           __u8 xfer)
443 {
444         struct usb_host_endpoint *ep;
445         int i, attr;
446
447         epaddr |= USB_DIR_IN;
448         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
449                 ep = &alt->endpoint[i];
450                 if (ep->desc.bEndpointAddress == epaddr) {
451                         attr = ep->desc.bmAttributes
452                                                 & USB_ENDPOINT_XFERTYPE_MASK;
453                         if (attr == xfer)
454                                 return ep;
455                         break;
456                 }
457         }
458         return NULL;
459 }
460
461 /*
462  * look for an input (isoc or bulk) endpoint
463  *
464  * The endpoint is defined by the subdriver.
465  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
466  * This routine may be called many times when the bandwidth is too small
467  * (the bandwidth is checked on urb submit).
468  */
469 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
470 {
471         struct usb_interface *intf;
472         struct usb_host_endpoint *ep;
473         int i, ret;
474
475         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
476         ep = NULL;
477         i = gspca_dev->alt;                     /* previous alt setting */
478
479         /* try isoc */
480         while (--i > 0) {                       /* alt 0 is unusable */
481                 ep = alt_xfer(&intf->altsetting[i],
482                                 gspca_dev->cam.epaddr,
483                                 USB_ENDPOINT_XFER_ISOC);
484                 if (ep)
485                         break;
486         }
487
488         /* if no isoc, try bulk */
489         if (ep == NULL) {
490                 ep = alt_xfer(&intf->altsetting[0],
491                                 gspca_dev->cam.epaddr,
492                                 USB_ENDPOINT_XFER_BULK);
493                 if (ep == NULL) {
494                         err("no transfer endpoint found");
495                         return NULL;
496                 }
497         }
498         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
499                         i, ep->desc.bEndpointAddress);
500         if (i > 0) {
501                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
502                 if (ret < 0) {
503                         err("set interface err %d", ret);
504                         return NULL;
505                 }
506         }
507         gspca_dev->alt = i;             /* memorize the current alt setting */
508         return ep;
509 }
510
511 /*
512  * create the URBs for image transfer
513  */
514 static int create_urbs(struct gspca_dev *gspca_dev,
515                         struct usb_host_endpoint *ep)
516 {
517         struct urb *urb;
518         int n, nurbs, i, psize, npkt, bsize;
519
520         /* calculate the packet size and the number of packets */
521         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
522
523         if (gspca_dev->alt != 0) {              /* isoc */
524
525                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
526                 psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
527                 npkt = ISO_MAX_SIZE / psize;
528                 if (npkt > ISO_MAX_PKT)
529                         npkt = ISO_MAX_PKT;
530                 bsize = psize * npkt;
531                 PDEBUG(D_STREAM,
532                         "isoc %d pkts size %d = bsize:%d",
533                         npkt, psize, bsize);
534                 nurbs = DEF_NURBS;
535         } else {                                /* bulk */
536                 npkt = 0;
537                 bsize = gspca_dev->cam.bulk_size;
538                 if (bsize == 0)
539                         bsize = psize;
540                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
541                 if (gspca_dev->cam.bulk_nurbs != 0)
542                         nurbs = gspca_dev->cam.bulk_nurbs;
543                 else
544                         nurbs = 1;
545         }
546
547         gspca_dev->nurbs = nurbs;
548         for (n = 0; n < nurbs; n++) {
549                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
550                 if (!urb) {
551                         err("usb_alloc_urb failed");
552                         destroy_urbs(gspca_dev);
553                         return -ENOMEM;
554                 }
555                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
556                                                 bsize,
557                                                 GFP_KERNEL,
558                                                 &urb->transfer_dma);
559
560                 if (urb->transfer_buffer == NULL) {
561                         usb_free_urb(urb);
562                         err("usb_buffer_urb failed");
563                         destroy_urbs(gspca_dev);
564                         return -ENOMEM;
565                 }
566                 gspca_dev->urb[n] = urb;
567                 urb->dev = gspca_dev->dev;
568                 urb->context = gspca_dev;
569                 urb->transfer_buffer_length = bsize;
570                 if (npkt != 0) {                /* ISOC */
571                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
572                                                     ep->desc.bEndpointAddress);
573                         urb->transfer_flags = URB_ISO_ASAP
574                                         | URB_NO_TRANSFER_DMA_MAP;
575                         urb->interval = ep->desc.bInterval;
576                         urb->complete = isoc_irq;
577                         urb->number_of_packets = npkt;
578                         for (i = 0; i < npkt; i++) {
579                                 urb->iso_frame_desc[i].length = psize;
580                                 urb->iso_frame_desc[i].offset = psize * i;
581                         }
582                 } else {                /* bulk */
583                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
584                                                 ep->desc.bEndpointAddress),
585                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
586                         urb->complete = bulk_irq;
587                 }
588         }
589         return 0;
590 }
591
592 /*
593  * start the USB transfer
594  */
595 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
596 {
597         struct usb_host_endpoint *ep;
598         int n, ret;
599
600         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
601                 return -ERESTARTSYS;
602
603         /* set the higher alternate setting and
604          * loop until urb submit succeeds */
605         gspca_dev->alt = gspca_dev->nbalt;
606         for (;;) {
607                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
608                 ep = get_ep(gspca_dev);
609                 if (ep == NULL) {
610                         ret = -EIO;
611                         goto out;
612                 }
613                 ret = create_urbs(gspca_dev, ep);
614                 if (ret < 0)
615                         goto out;
616
617                 /* clear the bulk endpoint */
618                 if (gspca_dev->alt == 0)        /* if bulk transfer */
619                         usb_clear_halt(gspca_dev->dev,
620                                         usb_rcvintpipe(gspca_dev->dev,
621                                                  gspca_dev->cam.epaddr));
622
623                 /* start the cam */
624                 ret = gspca_dev->sd_desc->start(gspca_dev);
625                 if (ret < 0) {
626                         destroy_urbs(gspca_dev);
627                         goto out;
628                 }
629                 gspca_dev->streaming = 1;
630
631                 /* some bulk transfers are started by the subdriver */
632                 if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
633                         break;
634
635                 /* submit the URBs */
636                 for (n = 0; n < gspca_dev->nurbs; n++) {
637                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
638                         if (ret < 0) {
639                                 PDEBUG(D_ERR|D_STREAM,
640                                         "usb_submit_urb [%d] err %d", n, ret);
641                                 gspca_dev->streaming = 0;
642                                 destroy_urbs(gspca_dev);
643                                 if (ret == -ENOSPC) {
644                                         msleep(20);     /* wait for kill
645                                                          * complete */
646                                         break;  /* try the previous alt */
647                                 }
648                                 goto out;
649                         }
650                 }
651                 if (ret >= 0)
652                         break;
653         }
654 out:
655         mutex_unlock(&gspca_dev->usb_lock);
656         return ret;
657 }
658
659 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
660 {
661         int ret;
662
663         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
664         if (ret < 0)
665                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
666         return ret;
667 }
668
669 /* Note: both the queue and the usb locks should be held when calling this */
670 static void gspca_stream_off(struct gspca_dev *gspca_dev)
671 {
672         gspca_dev->streaming = 0;
673         if (gspca_dev->present
674             && gspca_dev->sd_desc->stopN)
675                 gspca_dev->sd_desc->stopN(gspca_dev);
676         destroy_urbs(gspca_dev);
677         gspca_set_alt0(gspca_dev);
678         if (gspca_dev->sd_desc->stop0)
679                 gspca_dev->sd_desc->stop0(gspca_dev);
680         PDEBUG(D_STREAM, "stream off OK");
681 }
682
683 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
684 {
685         int i;
686
687         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
688         gspca_dev->curr_mode = i;
689         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
690         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
691         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
692 }
693
694 static int wxh_to_mode(struct gspca_dev *gspca_dev,
695                         int width, int height)
696 {
697         int i;
698
699         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
700                 if (width >= gspca_dev->cam.cam_mode[i].width
701                     && height >= gspca_dev->cam.cam_mode[i].height)
702                         break;
703         }
704         return i;
705 }
706
707 /*
708  * search a mode with the right pixel format
709  */
710 static int gspca_get_mode(struct gspca_dev *gspca_dev,
711                         int mode,
712                         int pixfmt)
713 {
714         int modeU, modeD;
715
716         modeU = modeD = mode;
717         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
718                 if (--modeD >= 0) {
719                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
720                                                                 == pixfmt)
721                                 return modeD;
722                 }
723                 if (++modeU < gspca_dev->cam.nmodes) {
724                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
725                                                                 == pixfmt)
726                                 return modeU;
727                 }
728         }
729         return -EINVAL;
730 }
731
732 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
733                                 struct v4l2_fmtdesc *fmtdesc)
734 {
735         struct gspca_dev *gspca_dev = priv;
736         int i, j, index;
737         __u32 fmt_tb[8];
738
739         /* give an index to each format */
740         index = 0;
741         j = 0;
742         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
743                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
744                 j = 0;
745                 for (;;) {
746                         if (fmt_tb[j] == fmt_tb[index])
747                                 break;
748                         j++;
749                 }
750                 if (j == index) {
751                         if (fmtdesc->index == index)
752                                 break;          /* new format */
753                         index++;
754                         if (index >= ARRAY_SIZE(fmt_tb))
755                                 return -EINVAL;
756                 }
757         }
758         if (i < 0)
759                 return -EINVAL;         /* no more format */
760
761         fmtdesc->pixelformat = fmt_tb[index];
762         if (gspca_is_compressed(fmt_tb[index]))
763                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
764         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
765         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
766         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
767         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
768         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
769         fmtdesc->description[4] = '\0';
770         return 0;
771 }
772
773 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
774                             struct v4l2_format *fmt)
775 {
776         struct gspca_dev *gspca_dev = priv;
777         int mode;
778
779         mode = gspca_dev->curr_mode;
780         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
781                 sizeof fmt->fmt.pix);
782         return 0;
783 }
784
785 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
786                         struct v4l2_format *fmt)
787 {
788         int w, h, mode, mode2;
789
790         w = fmt->fmt.pix.width;
791         h = fmt->fmt.pix.height;
792
793 #ifdef GSPCA_DEBUG
794         if (gspca_debug & D_CONF)
795                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
796 #endif
797         /* search the closest mode for width and height */
798         mode = wxh_to_mode(gspca_dev, w, h);
799
800         /* OK if right palette */
801         if (gspca_dev->cam.cam_mode[mode].pixelformat
802                                                 != fmt->fmt.pix.pixelformat) {
803
804                 /* else, search the closest mode with the same pixel format */
805                 mode2 = gspca_get_mode(gspca_dev, mode,
806                                         fmt->fmt.pix.pixelformat);
807                 if (mode2 >= 0)
808                         mode = mode2;
809 /*              else
810                         ;                * no chance, return this mode */
811         }
812         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
813                 sizeof fmt->fmt.pix);
814         return mode;                    /* used when s_fmt */
815 }
816
817 static int vidioc_try_fmt_vid_cap(struct file *file,
818                               void *priv,
819                               struct v4l2_format *fmt)
820 {
821         struct gspca_dev *gspca_dev = priv;
822         int ret;
823
824         ret = try_fmt_vid_cap(gspca_dev, fmt);
825         if (ret < 0)
826                 return ret;
827         return 0;
828 }
829
830 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
831                             struct v4l2_format *fmt)
832 {
833         struct gspca_dev *gspca_dev = priv;
834         int ret;
835
836         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
837                 return -ERESTARTSYS;
838
839         ret = try_fmt_vid_cap(gspca_dev, fmt);
840         if (ret < 0)
841                 goto out;
842
843         if (gspca_dev->nframes != 0
844             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
845                 ret = -EINVAL;
846                 goto out;
847         }
848
849         if (ret == gspca_dev->curr_mode) {
850                 ret = 0;
851                 goto out;                       /* same mode */
852         }
853
854         if (gspca_dev->streaming) {
855                 ret = -EBUSY;
856                 goto out;
857         }
858         gspca_dev->width = fmt->fmt.pix.width;
859         gspca_dev->height = fmt->fmt.pix.height;
860         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
861         gspca_dev->curr_mode = ret;
862
863         ret = 0;
864 out:
865         mutex_unlock(&gspca_dev->queue_lock);
866         return ret;
867 }
868
869 static void gspca_release(struct video_device *vfd)
870 {
871         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
872
873         PDEBUG(D_STREAM, "device released");
874
875         kfree(gspca_dev->usb_buf);
876         kfree(gspca_dev);
877 }
878
879 static int dev_open(struct file *file)
880 {
881         struct gspca_dev *gspca_dev;
882         int ret;
883
884         PDEBUG(D_STREAM, "%s open", current->comm);
885         gspca_dev = (struct gspca_dev *) video_devdata(file);
886         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
887                 return -ERESTARTSYS;
888         if (!gspca_dev->present) {
889                 ret = -ENODEV;
890                 goto out;
891         }
892
893         if (gspca_dev->users > 4) {     /* (arbitrary value) */
894                 ret = -EBUSY;
895                 goto out;
896         }
897
898         /* protect the subdriver against rmmod */
899         if (!try_module_get(gspca_dev->module)) {
900                 ret = -ENODEV;
901                 goto out;
902         }
903
904         gspca_dev->users++;
905
906         file->private_data = gspca_dev;
907 #ifdef GSPCA_DEBUG
908         /* activate the v4l2 debug */
909         if (gspca_debug & D_V4L2)
910                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
911                                         | V4L2_DEBUG_IOCTL_ARG;
912         else
913                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
914                                         | V4L2_DEBUG_IOCTL_ARG);
915 #endif
916         ret = 0;
917 out:
918         mutex_unlock(&gspca_dev->queue_lock);
919         if (ret != 0)
920                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
921         else
922                 PDEBUG(D_STREAM, "open done");
923         return ret;
924 }
925
926 static int dev_close(struct file *file)
927 {
928         struct gspca_dev *gspca_dev = file->private_data;
929
930         PDEBUG(D_STREAM, "%s close", current->comm);
931         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
932                 return -ERESTARTSYS;
933         gspca_dev->users--;
934
935         /* if the file did the capture, free the streaming resources */
936         if (gspca_dev->capt_file == file) {
937                 if (gspca_dev->streaming) {
938                         mutex_lock(&gspca_dev->usb_lock);
939                         gspca_stream_off(gspca_dev);
940                         mutex_unlock(&gspca_dev->usb_lock);
941                 }
942                 frame_free(gspca_dev);
943                 gspca_dev->capt_file = NULL;
944                 gspca_dev->memory = GSPCA_MEMORY_NO;
945         }
946         file->private_data = NULL;
947         module_put(gspca_dev->module);
948         mutex_unlock(&gspca_dev->queue_lock);
949
950         PDEBUG(D_STREAM, "close done");
951
952         return 0;
953 }
954
955 static int vidioc_querycap(struct file *file, void  *priv,
956                            struct v4l2_capability *cap)
957 {
958         struct gspca_dev *gspca_dev = priv;
959
960         memset(cap, 0, sizeof *cap);
961         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
962         if (gspca_dev->dev->product != NULL) {
963                 strncpy(cap->card, gspca_dev->dev->product,
964                         sizeof cap->card);
965         } else {
966                 snprintf(cap->card, sizeof cap->card,
967                         "USB Camera (%04x:%04x)",
968                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
969                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
970         }
971         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
972                 sizeof cap->bus_info);
973         cap->version = DRIVER_VERSION_NUMBER;
974         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
975                           | V4L2_CAP_STREAMING
976                           | V4L2_CAP_READWRITE;
977         return 0;
978 }
979
980 static int vidioc_queryctrl(struct file *file, void *priv,
981                            struct v4l2_queryctrl *q_ctrl)
982 {
983         struct gspca_dev *gspca_dev = priv;
984         int i, ix;
985         u32 id;
986
987         ix = -1;
988         id = q_ctrl->id;
989         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
990                 id &= V4L2_CTRL_ID_MASK;
991                 id++;
992                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
993                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
994                                 continue;
995                         if (ix < 0) {
996                                 ix = i;
997                                 continue;
998                         }
999                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id
1000                                     > gspca_dev->sd_desc->ctrls[ix].qctrl.id)
1001                                 continue;
1002                         ix = i;
1003                 }
1004         }
1005         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1006                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
1007                         ix = i;
1008                         break;
1009                 }
1010         }
1011         if (ix < 0)
1012                 return -EINVAL;
1013         memcpy(q_ctrl, &gspca_dev->sd_desc->ctrls[ix].qctrl,
1014                 sizeof *q_ctrl);
1015         if (gspca_dev->ctrl_dis & (1 << ix))
1016                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
1017         return 0;
1018 }
1019
1020 static int vidioc_s_ctrl(struct file *file, void *priv,
1021                          struct v4l2_control *ctrl)
1022 {
1023         struct gspca_dev *gspca_dev = priv;
1024         const struct ctrl *ctrls;
1025         int i, ret;
1026
1027         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1028              i < gspca_dev->sd_desc->nctrls;
1029              i++, ctrls++) {
1030                 if (ctrl->id != ctrls->qctrl.id)
1031                         continue;
1032                 if (gspca_dev->ctrl_dis & (1 << i))
1033                         return -EINVAL;
1034                 if (ctrl->value < ctrls->qctrl.minimum
1035                     || ctrl->value > ctrls->qctrl.maximum)
1036                         return -ERANGE;
1037                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1038                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1039                         return -ERESTARTSYS;
1040                 ret = ctrls->set(gspca_dev, ctrl->value);
1041                 mutex_unlock(&gspca_dev->usb_lock);
1042                 return ret;
1043         }
1044         return -EINVAL;
1045 }
1046
1047 static int vidioc_g_ctrl(struct file *file, void *priv,
1048                          struct v4l2_control *ctrl)
1049 {
1050         struct gspca_dev *gspca_dev = priv;
1051
1052         const struct ctrl *ctrls;
1053         int i, ret;
1054
1055         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1056              i < gspca_dev->sd_desc->nctrls;
1057              i++, ctrls++) {
1058                 if (ctrl->id != ctrls->qctrl.id)
1059                         continue;
1060                 if (gspca_dev->ctrl_dis & (1 << i))
1061                         return -EINVAL;
1062                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1063                         return -ERESTARTSYS;
1064                 ret = ctrls->get(gspca_dev, &ctrl->value);
1065                 mutex_unlock(&gspca_dev->usb_lock);
1066                 return ret;
1067         }
1068         return -EINVAL;
1069 }
1070
1071 /*fixme: have an audio flag in gspca_dev?*/
1072 static int vidioc_s_audio(struct file *file, void *priv,
1073                          struct v4l2_audio *audio)
1074 {
1075         if (audio->index != 0)
1076                 return -EINVAL;
1077         return 0;
1078 }
1079
1080 static int vidioc_g_audio(struct file *file, void *priv,
1081                          struct v4l2_audio *audio)
1082 {
1083         memset(audio, 0, sizeof *audio);
1084         strcpy(audio->name, "Microphone");
1085         return 0;
1086 }
1087
1088 static int vidioc_enumaudio(struct file *file, void *priv,
1089                          struct v4l2_audio *audio)
1090 {
1091         if (audio->index != 0)
1092                 return -EINVAL;
1093
1094         strcpy(audio->name, "Microphone");
1095         audio->capability = 0;
1096         audio->mode = 0;
1097         return 0;
1098 }
1099
1100 static int vidioc_querymenu(struct file *file, void *priv,
1101                             struct v4l2_querymenu *qmenu)
1102 {
1103         struct gspca_dev *gspca_dev = priv;
1104
1105         if (!gspca_dev->sd_desc->querymenu)
1106                 return -EINVAL;
1107         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1108 }
1109
1110 static int vidioc_enum_input(struct file *file, void *priv,
1111                                 struct v4l2_input *input)
1112 {
1113         struct gspca_dev *gspca_dev = priv;
1114
1115         if (input->index != 0)
1116                 return -EINVAL;
1117         memset(input, 0, sizeof *input);
1118         input->type = V4L2_INPUT_TYPE_CAMERA;
1119         strncpy(input->name, gspca_dev->sd_desc->name,
1120                 sizeof input->name);
1121         return 0;
1122 }
1123
1124 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1125 {
1126         *i = 0;
1127         return 0;
1128 }
1129
1130 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1131 {
1132         if (i > 0)
1133                 return -EINVAL;
1134         return (0);
1135 }
1136
1137 static int vidioc_reqbufs(struct file *file, void *priv,
1138                           struct v4l2_requestbuffers *rb)
1139 {
1140         struct gspca_dev *gspca_dev = priv;
1141         int i, ret = 0;
1142
1143         switch (rb->memory) {
1144         case GSPCA_MEMORY_READ:                 /* (internal call) */
1145         case V4L2_MEMORY_MMAP:
1146         case V4L2_MEMORY_USERPTR:
1147                 break;
1148         default:
1149                 return -EINVAL;
1150         }
1151         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1152                 return -ERESTARTSYS;
1153
1154         if (gspca_dev->memory != GSPCA_MEMORY_NO
1155             && gspca_dev->memory != rb->memory) {
1156                 ret = -EBUSY;
1157                 goto out;
1158         }
1159
1160         /* only one file may do the capture */
1161         if (gspca_dev->capt_file != NULL
1162             && gspca_dev->capt_file != file) {
1163                 ret = -EBUSY;
1164                 goto out;
1165         }
1166
1167         /* if allocated, the buffers must not be mapped */
1168         for (i = 0; i < gspca_dev->nframes; i++) {
1169                 if (gspca_dev->frame[i].vma_use_count) {
1170                         ret = -EBUSY;
1171                         goto out;
1172                 }
1173         }
1174
1175         /* stop streaming */
1176         if (gspca_dev->streaming) {
1177                 mutex_lock(&gspca_dev->usb_lock);
1178                 gspca_stream_off(gspca_dev);
1179                 mutex_unlock(&gspca_dev->usb_lock);
1180         }
1181
1182         /* free the previous allocated buffers, if any */
1183         if (gspca_dev->nframes != 0) {
1184                 frame_free(gspca_dev);
1185                 gspca_dev->capt_file = NULL;
1186         }
1187         if (rb->count == 0)                     /* unrequest */
1188                 goto out;
1189         gspca_dev->memory = rb->memory;
1190         ret = frame_alloc(gspca_dev, rb->count);
1191         if (ret == 0) {
1192                 rb->count = gspca_dev->nframes;
1193                 gspca_dev->capt_file = file;
1194         }
1195 out:
1196         mutex_unlock(&gspca_dev->queue_lock);
1197         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1198         return ret;
1199 }
1200
1201 static int vidioc_querybuf(struct file *file, void *priv,
1202                            struct v4l2_buffer *v4l2_buf)
1203 {
1204         struct gspca_dev *gspca_dev = priv;
1205         struct gspca_frame *frame;
1206
1207         if (v4l2_buf->index < 0
1208             || v4l2_buf->index >= gspca_dev->nframes)
1209                 return -EINVAL;
1210
1211         frame = &gspca_dev->frame[v4l2_buf->index];
1212         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1213         return 0;
1214 }
1215
1216 static int vidioc_streamon(struct file *file, void *priv,
1217                            enum v4l2_buf_type buf_type)
1218 {
1219         struct gspca_dev *gspca_dev = priv;
1220         int ret;
1221
1222         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1223                 return -EINVAL;
1224         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1225                 return -ERESTARTSYS;
1226         if (!gspca_dev->present) {
1227                 ret = -ENODEV;
1228                 goto out;
1229         }
1230         if (gspca_dev->nframes == 0
1231             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1232                 ret = -EINVAL;
1233                 goto out;
1234         }
1235         if (!gspca_dev->streaming) {
1236                 ret = gspca_init_transfer(gspca_dev);
1237                 if (ret < 0)
1238                         goto out;
1239         }
1240 #ifdef GSPCA_DEBUG
1241         if (gspca_debug & D_STREAM) {
1242                 PDEBUG_MODE("stream on OK",
1243                         gspca_dev->pixfmt,
1244                         gspca_dev->width,
1245                         gspca_dev->height);
1246         }
1247 #endif
1248         ret = 0;
1249 out:
1250         mutex_unlock(&gspca_dev->queue_lock);
1251         return ret;
1252 }
1253
1254 static int vidioc_streamoff(struct file *file, void *priv,
1255                                 enum v4l2_buf_type buf_type)
1256 {
1257         struct gspca_dev *gspca_dev = priv;
1258         int i, ret;
1259
1260         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1261                 return -EINVAL;
1262         if (!gspca_dev->streaming)
1263                 return 0;
1264         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1265                 return -ERESTARTSYS;
1266
1267         /* stop streaming */
1268         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1269                 ret = -ERESTARTSYS;
1270                 goto out;
1271         }
1272         gspca_stream_off(gspca_dev);
1273         mutex_unlock(&gspca_dev->usb_lock);
1274
1275         /* empty the application queues */
1276         for (i = 0; i < gspca_dev->nframes; i++)
1277                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1278         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1279         gspca_dev->last_packet_type = DISCARD_PACKET;
1280         gspca_dev->sequence = 0;
1281         ret = 0;
1282 out:
1283         mutex_unlock(&gspca_dev->queue_lock);
1284         return ret;
1285 }
1286
1287 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1288                         struct v4l2_jpegcompression *jpegcomp)
1289 {
1290         struct gspca_dev *gspca_dev = priv;
1291         int ret;
1292
1293         if (!gspca_dev->sd_desc->get_jcomp)
1294                 return -EINVAL;
1295         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1296                 return -ERESTARTSYS;
1297         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1298         mutex_unlock(&gspca_dev->usb_lock);
1299         return ret;
1300 }
1301
1302 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1303                         struct v4l2_jpegcompression *jpegcomp)
1304 {
1305         struct gspca_dev *gspca_dev = priv;
1306         int ret;
1307
1308         if (!gspca_dev->sd_desc->set_jcomp)
1309                 return -EINVAL;
1310         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1311                 return -ERESTARTSYS;
1312         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1313         mutex_unlock(&gspca_dev->usb_lock);
1314         return ret;
1315 }
1316
1317 static int vidioc_g_parm(struct file *filp, void *priv,
1318                         struct v4l2_streamparm *parm)
1319 {
1320         struct gspca_dev *gspca_dev = priv;
1321
1322         memset(parm, 0, sizeof *parm);
1323         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1324         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1325
1326         if (gspca_dev->sd_desc->get_streamparm) {
1327                 int ret;
1328
1329                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1330                         return -ERESTARTSYS;
1331                 ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1332                 mutex_unlock(&gspca_dev->usb_lock);
1333                 return ret;
1334         }
1335
1336         return 0;
1337 }
1338
1339 static int vidioc_s_parm(struct file *filp, void *priv,
1340                         struct v4l2_streamparm *parm)
1341 {
1342         struct gspca_dev *gspca_dev = priv;
1343         int n;
1344
1345         n = parm->parm.capture.readbuffers;
1346         if (n == 0 || n > GSPCA_MAX_FRAMES)
1347                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1348         else
1349                 gspca_dev->nbufread = n;
1350
1351         if (gspca_dev->sd_desc->set_streamparm) {
1352                 int ret;
1353
1354                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1355                         return -ERESTARTSYS;
1356                 ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1357                 mutex_unlock(&gspca_dev->usb_lock);
1358                 return ret;
1359         }
1360
1361         return 0;
1362 }
1363
1364 static int vidioc_s_std(struct file *filp, void *priv,
1365                         v4l2_std_id *parm)
1366 {
1367         return 0;
1368 }
1369
1370 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1371 static int vidiocgmbuf(struct file *file, void *priv,
1372                         struct video_mbuf *mbuf)
1373 {
1374         struct gspca_dev *gspca_dev = file->private_data;
1375         int i;
1376
1377         PDEBUG(D_STREAM, "cgmbuf");
1378         if (gspca_dev->nframes == 0) {
1379                 int ret;
1380
1381                 {
1382                         struct v4l2_format fmt;
1383
1384                         memset(&fmt, 0, sizeof fmt);
1385                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1386                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1387                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1388                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1389                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1390                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1391                         if (ret != 0)
1392                                 return ret;
1393                 }
1394                 {
1395                         struct v4l2_requestbuffers rb;
1396
1397                         memset(&rb, 0, sizeof rb);
1398                         rb.count = 4;
1399                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1400                         rb.memory = V4L2_MEMORY_MMAP;
1401                         ret = vidioc_reqbufs(file, priv, &rb);
1402                         if (ret != 0)
1403                                 return ret;
1404                 }
1405         }
1406         mbuf->frames = gspca_dev->nframes;
1407         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1408         for (i = 0; i < mbuf->frames; i++)
1409                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1410         return 0;
1411 }
1412 #endif
1413
1414 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1415 {
1416         struct gspca_dev *gspca_dev = file->private_data;
1417         struct gspca_frame *frame;
1418         struct page *page;
1419         unsigned long addr, start, size;
1420         int i, ret;
1421
1422         start = vma->vm_start;
1423         size = vma->vm_end - vma->vm_start;
1424         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1425
1426         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1427                 return -ERESTARTSYS;
1428         if (!gspca_dev->present) {
1429                 ret = -ENODEV;
1430                 goto out;
1431         }
1432         if (gspca_dev->capt_file != file) {
1433                 ret = -EINVAL;
1434                 goto out;
1435         }
1436
1437         frame = NULL;
1438         for (i = 0; i < gspca_dev->nframes; ++i) {
1439                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1440                         PDEBUG(D_STREAM, "mmap bad memory type");
1441                         break;
1442                 }
1443                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1444                                                 == vma->vm_pgoff) {
1445                         frame = &gspca_dev->frame[i];
1446                         break;
1447                 }
1448         }
1449         if (frame == NULL) {
1450                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1451                 ret = -EINVAL;
1452                 goto out;
1453         }
1454 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1455         /* v4l1 maps all the buffers */
1456         if (i != 0
1457             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1458 #endif
1459             if (size != frame->v4l2_buf.length) {
1460                 PDEBUG(D_STREAM, "mmap bad size");
1461                 ret = -EINVAL;
1462                 goto out;
1463         }
1464
1465         /*
1466          * - VM_IO marks the area as being a mmaped region for I/O to a
1467          *   device. It also prevents the region from being core dumped.
1468          */
1469         vma->vm_flags |= VM_IO;
1470
1471         addr = (unsigned long) frame->data;
1472         while (size > 0) {
1473                 page = vmalloc_to_page((void *) addr);
1474                 ret = vm_insert_page(vma, start, page);
1475                 if (ret < 0)
1476                         goto out;
1477                 start += PAGE_SIZE;
1478                 addr += PAGE_SIZE;
1479                 size -= PAGE_SIZE;
1480         }
1481
1482         vma->vm_ops = &gspca_vm_ops;
1483         vma->vm_private_data = frame;
1484         gspca_vm_open(vma);
1485         ret = 0;
1486 out:
1487         mutex_unlock(&gspca_dev->queue_lock);
1488         return ret;
1489 }
1490
1491 /*
1492  * wait for a video frame
1493  *
1494  * If a frame is ready, its index is returned.
1495  */
1496 static int frame_wait(struct gspca_dev *gspca_dev,
1497                         int nonblock_ing)
1498 {
1499         struct gspca_frame *frame;
1500         int i, j, ret;
1501
1502         /* check if a frame is ready */
1503         i = gspca_dev->fr_o;
1504         j = gspca_dev->fr_queue[i];
1505         frame = &gspca_dev->frame[j];
1506
1507         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1508                 if (nonblock_ing)
1509                         return -EAGAIN;
1510
1511                 /* wait till a frame is ready */
1512                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1513                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1514                         !gspca_dev->streaming || !gspca_dev->present,
1515                         msecs_to_jiffies(3000));
1516                 if (ret < 0)
1517                         return ret;
1518                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1519                         return -EIO;
1520         }
1521
1522         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1523         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1524                 gspca_dev->fr_q,
1525                 gspca_dev->fr_i,
1526                 gspca_dev->fr_o);
1527
1528         if (gspca_dev->sd_desc->dq_callback) {
1529                 mutex_lock(&gspca_dev->usb_lock);
1530                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1531                 mutex_unlock(&gspca_dev->usb_lock);
1532         }
1533         return j;
1534 }
1535
1536 /*
1537  * dequeue a video buffer
1538  *
1539  * If nonblock_ing is false, block until a buffer is available.
1540  */
1541 static int vidioc_dqbuf(struct file *file, void *priv,
1542                         struct v4l2_buffer *v4l2_buf)
1543 {
1544         struct gspca_dev *gspca_dev = priv;
1545         struct gspca_frame *frame;
1546         int i, ret;
1547
1548         PDEBUG(D_FRAM, "dqbuf");
1549         if (v4l2_buf->memory != gspca_dev->memory)
1550                 return -EINVAL;
1551
1552         /* if not streaming, be sure the application will not loop forever */
1553         if (!(file->f_flags & O_NONBLOCK)
1554             && !gspca_dev->streaming && gspca_dev->users == 1)
1555                 return -EINVAL;
1556
1557         /* only the capturing file may dequeue */
1558         if (gspca_dev->capt_file != file)
1559                 return -EINVAL;
1560
1561         /* only one dequeue / read at a time */
1562         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1563                 return -ERESTARTSYS;
1564
1565         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1566         if (ret < 0)
1567                 goto out;
1568         i = ret;                                /* frame index */
1569         frame = &gspca_dev->frame[i];
1570         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1571                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1572                                  frame->data,
1573                                  frame->v4l2_buf.bytesused)) {
1574                         PDEBUG(D_ERR|D_STREAM,
1575                                 "dqbuf cp to user failed");
1576                         ret = -EFAULT;
1577                         goto out;
1578                 }
1579         }
1580         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1581         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1582         PDEBUG(D_FRAM, "dqbuf %d", i);
1583         ret = 0;
1584 out:
1585         mutex_unlock(&gspca_dev->read_lock);
1586         return ret;
1587 }
1588
1589 /*
1590  * queue a video buffer
1591  *
1592  * Attempting to queue a buffer that has already been
1593  * queued will return -EINVAL.
1594  */
1595 static int vidioc_qbuf(struct file *file, void *priv,
1596                         struct v4l2_buffer *v4l2_buf)
1597 {
1598         struct gspca_dev *gspca_dev = priv;
1599         struct gspca_frame *frame;
1600         int i, index, ret;
1601
1602         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1603
1604         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1605                 return -ERESTARTSYS;
1606
1607         index = v4l2_buf->index;
1608         if ((unsigned) index >= gspca_dev->nframes) {
1609                 PDEBUG(D_FRAM,
1610                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1611                 ret = -EINVAL;
1612                 goto out;
1613         }
1614         if (v4l2_buf->memory != gspca_dev->memory) {
1615                 PDEBUG(D_FRAM, "qbuf bad memory type");
1616                 ret = -EINVAL;
1617                 goto out;
1618         }
1619
1620         frame = &gspca_dev->frame[index];
1621         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1622                 PDEBUG(D_FRAM, "qbuf bad state");
1623                 ret = -EINVAL;
1624                 goto out;
1625         }
1626
1627         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1628
1629         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1630                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1631                 frame->v4l2_buf.length = v4l2_buf->length;
1632         }
1633
1634         /* put the buffer in the 'queued' queue */
1635         i = gspca_dev->fr_q;
1636         gspca_dev->fr_queue[i] = index;
1637         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1638         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1639                 gspca_dev->fr_q,
1640                 gspca_dev->fr_i,
1641                 gspca_dev->fr_o);
1642
1643         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1644         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1645         ret = 0;
1646 out:
1647         mutex_unlock(&gspca_dev->queue_lock);
1648         return ret;
1649 }
1650
1651 /*
1652  * allocate the resources for read()
1653  */
1654 static int read_alloc(struct gspca_dev *gspca_dev,
1655                         struct file *file)
1656 {
1657         struct v4l2_buffer v4l2_buf;
1658         int i, ret;
1659
1660         PDEBUG(D_STREAM, "read alloc");
1661         if (gspca_dev->nframes == 0) {
1662                 struct v4l2_requestbuffers rb;
1663
1664                 memset(&rb, 0, sizeof rb);
1665                 rb.count = gspca_dev->nbufread;
1666                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1667                 rb.memory = GSPCA_MEMORY_READ;
1668                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1669                 if (ret != 0) {
1670                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1671                         return ret;
1672                 }
1673                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1674                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1675                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1676                 for (i = 0; i < gspca_dev->nbufread; i++) {
1677                         v4l2_buf.index = i;
1678                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1679                         if (ret != 0) {
1680                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1681                                 return ret;
1682                         }
1683                 }
1684                 gspca_dev->memory = GSPCA_MEMORY_READ;
1685         }
1686
1687         /* start streaming */
1688         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1689         if (ret != 0)
1690                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1691         return ret;
1692 }
1693
1694 static unsigned int dev_poll(struct file *file, poll_table *wait)
1695 {
1696         struct gspca_dev *gspca_dev = file->private_data;
1697         int i, ret;
1698
1699         PDEBUG(D_FRAM, "poll");
1700
1701         poll_wait(file, &gspca_dev->wq, wait);
1702         if (!gspca_dev->present)
1703                 return POLLERR;
1704
1705         /* if reqbufs is not done, the user would use read() */
1706         if (gspca_dev->nframes == 0) {
1707                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1708                         return POLLERR;         /* not the 1st time */
1709                 ret = read_alloc(gspca_dev, file);
1710                 if (ret != 0)
1711                         return POLLERR;
1712         }
1713
1714         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1715                 return POLLERR;
1716         if (!gspca_dev->present) {
1717                 ret = POLLERR;
1718                 goto out;
1719         }
1720
1721         /* check the next incoming buffer */
1722         i = gspca_dev->fr_o;
1723         i = gspca_dev->fr_queue[i];
1724         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1725                 ret = POLLIN | POLLRDNORM;      /* something to read */
1726         else
1727                 ret = 0;
1728 out:
1729         mutex_unlock(&gspca_dev->queue_lock);
1730         return ret;
1731 }
1732
1733 static ssize_t dev_read(struct file *file, char __user *data,
1734                     size_t count, loff_t *ppos)
1735 {
1736         struct gspca_dev *gspca_dev = file->private_data;
1737         struct gspca_frame *frame;
1738         struct v4l2_buffer v4l2_buf;
1739         struct timeval timestamp;
1740         int n, ret, ret2;
1741
1742         PDEBUG(D_FRAM, "read (%zd)", count);
1743         if (!gspca_dev->present)
1744                 return -ENODEV;
1745         switch (gspca_dev->memory) {
1746         case GSPCA_MEMORY_NO:                   /* first time */
1747                 ret = read_alloc(gspca_dev, file);
1748                 if (ret != 0)
1749                         return ret;
1750                 break;
1751         case GSPCA_MEMORY_READ:
1752                 if (gspca_dev->capt_file == file)
1753                         break;
1754                 /* fall thru */
1755         default:
1756                 return -EINVAL;
1757         }
1758
1759         /* get a frame */
1760         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1761         timestamp.tv_sec--;
1762         n = 2;
1763         for (;;) {
1764                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1765                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1766                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1767                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1768                 if (ret != 0) {
1769                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1770                         return ret;
1771                 }
1772
1773                 /* if the process slept for more than 1 second,
1774                  * get a newer frame */
1775                 frame = &gspca_dev->frame[v4l2_buf.index];
1776                 if (--n < 0)
1777                         break;                  /* avoid infinite loop */
1778                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1779                         break;
1780                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1781                 if (ret != 0) {
1782                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1783                         return ret;
1784                 }
1785         }
1786
1787         /* copy the frame */
1788         if (count > frame->v4l2_buf.bytesused)
1789                 count = frame->v4l2_buf.bytesused;
1790         ret = copy_to_user(data, frame->data, count);
1791         if (ret != 0) {
1792                 PDEBUG(D_ERR|D_STREAM,
1793                         "read cp to user lack %d / %zd", ret, count);
1794                 ret = -EFAULT;
1795                 goto out;
1796         }
1797         ret = count;
1798 out:
1799         /* in each case, requeue the buffer */
1800         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1801         if (ret2 != 0)
1802                 return ret2;
1803         return ret;
1804 }
1805
1806 static struct v4l2_file_operations dev_fops = {
1807         .owner = THIS_MODULE,
1808         .open = dev_open,
1809         .release = dev_close,
1810         .read = dev_read,
1811         .mmap = dev_mmap,
1812         .unlocked_ioctl = video_ioctl2,
1813         .poll   = dev_poll,
1814 };
1815
1816 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1817         .vidioc_querycap        = vidioc_querycap,
1818         .vidioc_dqbuf           = vidioc_dqbuf,
1819         .vidioc_qbuf            = vidioc_qbuf,
1820         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1821         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1822         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1823         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1824         .vidioc_streamon        = vidioc_streamon,
1825         .vidioc_queryctrl       = vidioc_queryctrl,
1826         .vidioc_g_ctrl          = vidioc_g_ctrl,
1827         .vidioc_s_ctrl          = vidioc_s_ctrl,
1828         .vidioc_g_audio         = vidioc_g_audio,
1829         .vidioc_s_audio         = vidioc_s_audio,
1830         .vidioc_enumaudio       = vidioc_enumaudio,
1831         .vidioc_querymenu       = vidioc_querymenu,
1832         .vidioc_enum_input      = vidioc_enum_input,
1833         .vidioc_g_input         = vidioc_g_input,
1834         .vidioc_s_input         = vidioc_s_input,
1835         .vidioc_reqbufs         = vidioc_reqbufs,
1836         .vidioc_querybuf        = vidioc_querybuf,
1837         .vidioc_streamoff       = vidioc_streamoff,
1838         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1839         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1840         .vidioc_g_parm          = vidioc_g_parm,
1841         .vidioc_s_parm          = vidioc_s_parm,
1842         .vidioc_s_std           = vidioc_s_std,
1843 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1844         .vidiocgmbuf          = vidiocgmbuf,
1845 #endif
1846 };
1847
1848 static struct video_device gspca_template = {
1849         .name = "gspca main driver",
1850         .fops = &dev_fops,
1851         .ioctl_ops = &dev_ioctl_ops,
1852         .release = gspca_release,
1853         .minor = -1,
1854 };
1855
1856 /*
1857  * probe and create a new gspca device
1858  *
1859  * This function must be called by the sub-driver when it is
1860  * called for probing a new device.
1861  */
1862 int gspca_dev_probe(struct usb_interface *intf,
1863                 const struct usb_device_id *id,
1864                 const struct sd_desc *sd_desc,
1865                 int dev_size,
1866                 struct module *module)
1867 {
1868         struct usb_interface_descriptor *interface;
1869         struct gspca_dev *gspca_dev;
1870         struct usb_device *dev = interface_to_usbdev(intf);
1871         int ret;
1872
1873         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1874
1875         /* we don't handle multi-config cameras */
1876         if (dev->descriptor.bNumConfigurations != 1)
1877                 return -ENODEV;
1878         interface = &intf->cur_altsetting->desc;
1879         if (interface->bInterfaceNumber > 0)
1880                 return -ENODEV;
1881
1882         /* create the device */
1883         if (dev_size < sizeof *gspca_dev)
1884                 dev_size = sizeof *gspca_dev;
1885         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1886         if (!gspca_dev) {
1887                 err("couldn't kzalloc gspca struct");
1888                 return -ENOMEM;
1889         }
1890         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
1891         if (!gspca_dev->usb_buf) {
1892                 err("out of memory");
1893                 ret = -ENOMEM;
1894                 goto out;
1895         }
1896         gspca_dev->dev = dev;
1897         gspca_dev->iface = interface->bInterfaceNumber;
1898         gspca_dev->nbalt = intf->num_altsetting;
1899         gspca_dev->sd_desc = sd_desc;
1900         gspca_dev->nbufread = 2;
1901         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
1902
1903         /* configure the subdriver and initialize the USB device */
1904         ret = sd_desc->config(gspca_dev, id);
1905         if (ret < 0)
1906                 goto out;
1907         ret = sd_desc->init(gspca_dev);
1908         if (ret < 0)
1909                 goto out;
1910         ret = gspca_set_alt0(gspca_dev);
1911         if (ret < 0)
1912                 goto out;
1913         gspca_set_default_mode(gspca_dev);
1914
1915         mutex_init(&gspca_dev->usb_lock);
1916         mutex_init(&gspca_dev->read_lock);
1917         mutex_init(&gspca_dev->queue_lock);
1918         init_waitqueue_head(&gspca_dev->wq);
1919
1920         /* init video stuff */
1921         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1922         gspca_dev->vdev.parent = &dev->dev;
1923         gspca_dev->module = module;
1924         gspca_dev->present = 1;
1925         ret = video_register_device(&gspca_dev->vdev,
1926                                   VFL_TYPE_GRABBER,
1927                                   video_nr);
1928         if (ret < 0) {
1929                 err("video_register_device err %d", ret);
1930                 goto out;
1931         }
1932
1933         usb_set_intfdata(intf, gspca_dev);
1934         PDEBUG(D_PROBE, "probe ok");
1935         return 0;
1936 out:
1937         kfree(gspca_dev->usb_buf);
1938         kfree(gspca_dev);
1939         return ret;
1940 }
1941 EXPORT_SYMBOL(gspca_dev_probe);
1942
1943 /*
1944  * USB disconnection
1945  *
1946  * This function must be called by the sub-driver
1947  * when the device disconnects, after the specific resources are freed.
1948  */
1949 void gspca_disconnect(struct usb_interface *intf)
1950 {
1951         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1952
1953         gspca_dev->present = 0;
1954
1955         usb_set_intfdata(intf, NULL);
1956
1957         /* release the device */
1958         /* (this will call gspca_release() immediatly or on last close) */
1959         video_unregister_device(&gspca_dev->vdev);
1960
1961         PDEBUG(D_PROBE, "disconnect complete");
1962 }
1963 EXPORT_SYMBOL(gspca_disconnect);
1964
1965 #ifdef CONFIG_PM
1966 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1967 {
1968         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1969
1970         if (!gspca_dev->streaming)
1971                 return 0;
1972         gspca_dev->frozen = 1;          /* avoid urb error messages */
1973         if (gspca_dev->sd_desc->stopN)
1974                 gspca_dev->sd_desc->stopN(gspca_dev);
1975         destroy_urbs(gspca_dev);
1976         gspca_set_alt0(gspca_dev);
1977         if (gspca_dev->sd_desc->stop0)
1978                 gspca_dev->sd_desc->stop0(gspca_dev);
1979         return 0;
1980 }
1981 EXPORT_SYMBOL(gspca_suspend);
1982
1983 int gspca_resume(struct usb_interface *intf)
1984 {
1985         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1986
1987         gspca_dev->frozen = 0;
1988         gspca_dev->sd_desc->init(gspca_dev);
1989         if (gspca_dev->streaming)
1990                 return gspca_init_transfer(gspca_dev);
1991         return 0;
1992 }
1993 EXPORT_SYMBOL(gspca_resume);
1994 #endif
1995 /* -- cam driver utility functions -- */
1996
1997 /* auto gain and exposure algorithm based on the knee algorithm described here:
1998    http://ytse.tricolour.net/docs/LowLightOptimization.html
1999
2000    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2001    where changed. */
2002 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2003         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2004 {
2005         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2006         const struct ctrl *gain_ctrl = NULL;
2007         const struct ctrl *exposure_ctrl = NULL;
2008         const struct ctrl *autogain_ctrl = NULL;
2009         int retval = 0;
2010
2011         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2012                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2013                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2014                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2015                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2016                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2017                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2018         }
2019         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2020                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2021                         "on cam without (auto)gain/exposure");
2022                 return 0;
2023         }
2024
2025         if (gain_ctrl->get(gspca_dev, &gain) ||
2026                         exposure_ctrl->get(gspca_dev, &exposure) ||
2027                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2028                 return 0;
2029
2030         orig_gain = gain;
2031         orig_exposure = exposure;
2032
2033         /* If we are of a multiple of deadzone, do multiple steps to reach the
2034            desired lumination fast (with the risc of a slight overshoot) */
2035         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2036
2037         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2038                 avg_lum, desired_avg_lum, steps);
2039
2040         for (i = 0; i < steps; i++) {
2041                 if (avg_lum > desired_avg_lum) {
2042                         if (gain > gain_knee)
2043                                 gain--;
2044                         else if (exposure > exposure_knee)
2045                                 exposure--;
2046                         else if (gain > gain_ctrl->qctrl.default_value)
2047                                 gain--;
2048                         else if (exposure > exposure_ctrl->qctrl.minimum)
2049                                 exposure--;
2050                         else if (gain > gain_ctrl->qctrl.minimum)
2051                                 gain--;
2052                         else
2053                                 break;
2054                 } else {
2055                         if (gain < gain_ctrl->qctrl.default_value)
2056                                 gain++;
2057                         else if (exposure < exposure_knee)
2058                                 exposure++;
2059                         else if (gain < gain_knee)
2060                                 gain++;
2061                         else if (exposure < exposure_ctrl->qctrl.maximum)
2062                                 exposure++;
2063                         else if (gain < gain_ctrl->qctrl.maximum)
2064                                 gain++;
2065                         else
2066                                 break;
2067                 }
2068         }
2069
2070         if (gain != orig_gain) {
2071                 gain_ctrl->set(gspca_dev, gain);
2072                 retval = 1;
2073         }
2074         if (exposure != orig_exposure) {
2075                 exposure_ctrl->set(gspca_dev, exposure);
2076                 retval = 1;
2077         }
2078
2079         return retval;
2080 }
2081 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2082
2083 /* -- module insert / remove -- */
2084 static int __init gspca_init(void)
2085 {
2086         info("main v%d.%d.%d registered",
2087                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2088                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2089                 DRIVER_VERSION_NUMBER & 0xff);
2090         return 0;
2091 }
2092 static void __exit gspca_exit(void)
2093 {
2094         info("main deregistered");
2095 }
2096
2097 module_init(gspca_init);
2098 module_exit(gspca_exit);
2099
2100 #ifdef GSPCA_DEBUG
2101 module_param_named(debug, gspca_debug, int, 0644);
2102 MODULE_PARM_DESC(debug,
2103                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2104                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2105                 " 0x0100: v4l2");
2106 #endif