drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/ktime.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 10, 0)
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         err("Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         err("Input device registration failed with error %i",
 181                                 err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, buffer_len,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 227         gspca_dev->int_urb = urb;
 228         ret = usb_submit_urb(urb, GFP_KERNEL);
 229         if (ret < 0) {
 230                 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
 231                 goto error_submit;
 232         }
 233         return ret;
 234
 235 error_submit:
 236         usb_free_coherent(dev,
 237                           urb->transfer_buffer_length,
 238                           urb->transfer_buffer,
 239                           urb->transfer_dma);
 240 error_buffer:
 241         usb_free_urb(urb);
 242 error:
 243         return ret;
 244 }
 245
 246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 247 {
 248         struct usb_interface *intf;
 249         struct usb_host_interface *intf_desc;
 250         struct usb_endpoint_descriptor *ep;
 251         int i;
 252
 253         if (gspca_dev->sd_desc->int_pkt_scan)  {
 254                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 255                 intf_desc = intf->cur_altsetting;
 256                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 257                         ep = &intf_desc->endpoint[i].desc;
 258                         if (usb_endpoint_dir_in(ep) &&
 259                             usb_endpoint_xfer_int(ep)) {
 260
 261                                 alloc_and_submit_int_urb(gspca_dev, ep);
 262                                 break;
 263                         }
 264                 }
 265         }
 266 }
 267
 268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 269 {
 270         struct urb *urb;
 271
 272         urb = gspca_dev->int_urb;
 273         if (urb) {
 274                 gspca_dev->int_urb = NULL;
 275                 usb_kill_urb(urb);
 276                 usb_free_coherent(gspca_dev->dev,
 277                                   urb->transfer_buffer_length,
 278                                   urb->transfer_buffer,
 279                                   urb->transfer_dma);
 280                 usb_free_urb(urb);
 281         }
 282 }
 283 #else
 284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 285 {
 286 }
 287
 288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 289 {
 290 }
 291
 292 static inline int gspca_input_connect(struct gspca_dev *dev)
 293 {
 294         return 0;
 295 }
 296 #endif
 297
 298 /*
 299  * fill a video frame from an URB and resubmit
 300  */
 301 static void fill_frame(struct gspca_dev *gspca_dev,
 302                         struct urb *urb)
 303 {
 304         u8 *data;               /* address of data in the iso message */
 305         int i, len, st;
 306         cam_pkt_op pkt_scan;
 307
 308         if (urb->status != 0) {
 309                 if (urb->status == -ESHUTDOWN)
 310                         return;         /* disconnection */
 311 #ifdef CONFIG_PM
 312                 if (gspca_dev->frozen)
 313                         return;
 314 #endif
 315                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321
 322                 /* check the packet status and length */
 323                 len = urb->iso_frame_desc[i].actual_length;
 324                 if (len == 0) {
 325                         if (gspca_dev->empty_packet == 0)
 326                                 gspca_dev->empty_packet = 1;
 327                         continue;
 328                 }
 329                 st = urb->iso_frame_desc[i].status;
 330                 if (st) {
 331                         err("ISOC data error: [%d] len=%d, status=%d",
 332                                 i, len, st);
 333                         gspca_dev->last_packet_type = DISCARD_PACKET;
 334                         continue;
 335                 }
 336
 337                 /* let the packet be analyzed by the subdriver */
 338                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 339                         i, urb->iso_frame_desc[i].offset, len);
 340                 data = (u8 *) urb->transfer_buffer
 341                                         + urb->iso_frame_desc[i].offset;
 342                 pkt_scan(gspca_dev, data, len);
 343         }
 344
 345 resubmit:
 346         /* resubmit the URB */
 347         st = usb_submit_urb(urb, GFP_ATOMIC);
 348         if (st < 0)
 349                 err("usb_submit_urb() ret %d", st);
 350 }
 351
 352 /*
 353  * ISOC message interrupt from the USB device
 354  *
 355  * Analyse each packet and call the subdriver for copy to the frame buffer.
 356  */
 357 static void isoc_irq(struct urb *urb)
 358 {
 359         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 360
 361         PDEBUG(D_PACK, "isoc irq");
 362         if (!gspca_dev->streaming)
 363                 return;
 364         fill_frame(gspca_dev, urb);
 365 }
 366
 367 /*
 368  * bulk message interrupt from the USB device
 369  */
 370 static void bulk_irq(struct urb *urb)
 371 {
 372         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 373         int st;
 374
 375         PDEBUG(D_PACK, "bulk irq");
 376         if (!gspca_dev->streaming)
 377                 return;
 378         switch (urb->status) {
 379         case 0:
 380                 break;
 381         case -ESHUTDOWN:
 382                 return;         /* disconnection */
 383         default:
 384 #ifdef CONFIG_PM
 385                 if (gspca_dev->frozen)
 386                         return;
 387 #endif
 388                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 389                 urb->status = 0;
 390                 goto resubmit;
 391         }
 392
 393         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 394         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 395                                 urb->transfer_buffer,
 396                                 urb->actual_length);
 397
 398 resubmit:
 399         /* resubmit the URB */
 400         if (gspca_dev->cam.bulk_nurbs != 0) {
 401                 st = usb_submit_urb(urb, GFP_ATOMIC);
 402                 if (st < 0)
 403                         err("usb_submit_urb() ret %d", st);
 404         }
 405 }
 406
 407 /*
 408  * add data to the current frame
 409  *
 410  * This function is called by the subdrivers at interrupt level.
 411  *
 412  * To build a frame, these ones must add
 413  *      - one FIRST_PACKET
 414  *      - 0 or many INTER_PACKETs
 415  *      - one LAST_PACKET
 416  * DISCARD_PACKET invalidates the whole frame.
 417  * On LAST_PACKET, a new frame is returned.
 418  */
 419 void gspca_frame_add(struct gspca_dev *gspca_dev,
 420                         enum gspca_packet_type packet_type,
 421                         const u8 *data,
 422                         int len)
 423 {
 424         struct gspca_frame *frame;
 425         int i, j;
 426
 427         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 428
 429         if (packet_type == FIRST_PACKET) {
 430                 i = atomic_read(&gspca_dev->fr_i);
 431
 432                 /* if there are no queued buffer, discard the whole frame */
 433                 if (i == atomic_read(&gspca_dev->fr_q)) {
 434                         gspca_dev->last_packet_type = DISCARD_PACKET;
 435                         gspca_dev->sequence++;
 436                         return;
 437                 }
 438                 j = gspca_dev->fr_queue[i];
 439                 frame = &gspca_dev->frame[j];
 440                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 441                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 442                 gspca_dev->image = frame->data;
 443                 gspca_dev->image_len = 0;
 444         } else {
 445                 switch (gspca_dev->last_packet_type) {
 446                 case DISCARD_PACKET:
 447                         if (packet_type == LAST_PACKET)
 448                                 gspca_dev->last_packet_type = packet_type;
 449                         return;
 450                 case LAST_PACKET:
 451                         return;
 452                 }
 453         }
 454
 455         /* append the packet to the frame buffer */
 456         if (len > 0) {
 457                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 458                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 459                                 gspca_dev->image_len + len,
 460                                 gspca_dev->frsz);
 461                         packet_type = DISCARD_PACKET;
 462                 } else {
 463 /* !! image is NULL only when last pkt is LAST or DISCARD
 464                         if (gspca_dev->image == NULL) {
 465                                 err("gspca_frame_add() image == NULL");
 466                                 return;
 467                         }
 468  */
 469                         memcpy(gspca_dev->image + gspca_dev->image_len,
 470                                 data, len);
 471                         gspca_dev->image_len += len;
 472                 }
 473         }
 474         gspca_dev->last_packet_type = packet_type;
 475
 476         /* if last packet, invalidate packet concatenation until
 477          * next first packet, wake up the application and advance
 478          * in the queue */
 479         if (packet_type == LAST_PACKET) {
 480                 i = atomic_read(&gspca_dev->fr_i);
 481                 j = gspca_dev->fr_queue[i];
 482                 frame = &gspca_dev->frame[j];
 483                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 484                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 485                                          | V4L2_BUF_FLAG_DONE)
 486                                         & ~V4L2_BUF_FLAG_QUEUED;
 487                 i = (i + 1) % GSPCA_MAX_FRAMES;
 488                 atomic_set(&gspca_dev->fr_i, i);
 489                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 490                 PDEBUG(D_FRAM, "frame complete len:%d",
 491                         frame->v4l2_buf.bytesused);
 492                 gspca_dev->image = NULL;
 493                 gspca_dev->image_len = 0;
 494         }
 495 }
 496 EXPORT_SYMBOL(gspca_frame_add);
 497
 498 static int gspca_is_compressed(__u32 format)
 499 {
 500         switch (format) {
 501         case V4L2_PIX_FMT_MJPEG:
 502         case V4L2_PIX_FMT_JPEG:
 503         case V4L2_PIX_FMT_SPCA561:
 504         case V4L2_PIX_FMT_PAC207:
 505         case V4L2_PIX_FMT_MR97310A:
 506                 return 1;
 507         }
 508         return 0;
 509 }
 510
 511 static int frame_alloc(struct gspca_dev *gspca_dev,
 512                         unsigned int count)
 513 {
 514         struct gspca_frame *frame;
 515         unsigned int frsz;
 516         int i;
 517
 518         i = gspca_dev->curr_mode;
 519         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 520         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 521         frsz = PAGE_ALIGN(frsz);
 522         gspca_dev->frsz = frsz;
 523         if (count >= GSPCA_MAX_FRAMES)
 524                 count = GSPCA_MAX_FRAMES - 1;
 525         gspca_dev->frbuf = vmalloc_32(frsz * count);
 526         if (!gspca_dev->frbuf) {
 527                 err("frame alloc failed");
 528                 return -ENOMEM;
 529         }
 530         gspca_dev->nframes = count;
 531         for (i = 0; i < count; i++) {
 532                 frame = &gspca_dev->frame[i];
 533                 frame->v4l2_buf.index = i;
 534                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 535                 frame->v4l2_buf.flags = 0;
 536                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 537                 frame->v4l2_buf.length = frsz;
 538                 frame->v4l2_buf.memory = gspca_dev->memory;
 539                 frame->v4l2_buf.sequence = 0;
 540                 frame->data = gspca_dev->frbuf + i * frsz;
 541                 frame->v4l2_buf.m.offset = i * frsz;
 542         }
 543         atomic_set(&gspca_dev->fr_q, 0);
 544         atomic_set(&gspca_dev->fr_i, 0);
 545         gspca_dev->fr_o = 0;
 546         return 0;
 547 }
 548
 549 static void frame_free(struct gspca_dev *gspca_dev)
 550 {
 551         int i;
 552
 553         PDEBUG(D_STREAM, "frame free");
 554         if (gspca_dev->frbuf != NULL) {
 555                 vfree(gspca_dev->frbuf);
 556                 gspca_dev->frbuf = NULL;
 557                 for (i = 0; i < gspca_dev->nframes; i++)
 558                         gspca_dev->frame[i].data = NULL;
 559         }
 560         gspca_dev->nframes = 0;
 561 }
 562
 563 static void destroy_urbs(struct gspca_dev *gspca_dev)
 564 {
 565         struct urb *urb;
 566         unsigned int i;
 567
 568         PDEBUG(D_STREAM, "kill transfer");
 569         for (i = 0; i < MAX_NURBS; i++) {
 570                 urb = gspca_dev->urb[i];
 571                 if (urb == NULL)
 572                         break;
 573
 574                 gspca_dev->urb[i] = NULL;
 575                 usb_kill_urb(urb);
 576                 if (urb->transfer_buffer != NULL)
 577                         usb_free_coherent(gspca_dev->dev,
 578                                           urb->transfer_buffer_length,
 579                                           urb->transfer_buffer,
 580                                           urb->transfer_dma);
 581                 usb_free_urb(urb);
 582         }
 583 }
 584
 585 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 586 {
 587         int ret;
 588
 589         if (gspca_dev->alt == 0)
 590                 return 0;
 591         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 592         if (ret < 0)
 593                 err("set alt 0 err %d", ret);
 594         return ret;
 595 }
 596
 597 /* Note: both the queue and the usb locks should be held when calling this */
 598 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 599 {
 600         gspca_dev->streaming = 0;
 601         if (gspca_dev->present) {
 602                 if (gspca_dev->sd_desc->stopN)
 603                         gspca_dev->sd_desc->stopN(gspca_dev);
 604                 destroy_urbs(gspca_dev);
 605                 gspca_input_destroy_urb(gspca_dev);
 606                 gspca_set_alt0(gspca_dev);
 607                 gspca_input_create_urb(gspca_dev);
 608         }
 609
 610         /* always call stop0 to free the subdriver's resources */
 611         if (gspca_dev->sd_desc->stop0)
 612                 gspca_dev->sd_desc->stop0(gspca_dev);
 613         PDEBUG(D_STREAM, "stream off OK");
 614 }
 615
 616 /*
 617  * look for an input transfer endpoint in an alternate setting
 618  */
 619 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 620                                           int xfer)
 621 {
 622         struct usb_host_endpoint *ep;
 623         int i, attr;
 624
 625         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 626                 ep = &alt->endpoint[i];
 627                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 628                 if (attr == xfer
 629                     && ep->desc.wMaxPacketSize != 0)
 630                         return ep;
 631         }
 632         return NULL;
 633 }
 634
 635 /*
 636  * look for an input (isoc or bulk) endpoint
 637  *
 638  * The endpoint is defined by the subdriver.
 639  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 640  * This routine may be called many times when the bandwidth is too small
 641  * (the bandwidth is checked on urb submit).
 642  */
 643 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 644 {
 645         struct usb_interface *intf;
 646         struct usb_host_endpoint *ep;
 647         int xfer, i, ret;
 648
 649         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 650         ep = NULL;
 651         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 652                                    : USB_ENDPOINT_XFER_ISOC;
 653         i = gspca_dev->alt;                     /* previous alt setting */
 654         if (gspca_dev->cam.reverse_alts) {
 655                 if (gspca_dev->audio && i < gspca_dev->nbalt - 2)
 656                         i++;
 657                 while (++i < gspca_dev->nbalt) {
 658                         ep = alt_xfer(&intf->altsetting[i], xfer);
 659                         if (ep)
 660                                 break;
 661                 }
 662         } else {
 663                 if (gspca_dev->audio && i > 1)
 664                         i--;
 665                 while (--i >= 0) {
 666                         ep = alt_xfer(&intf->altsetting[i], xfer);
 667                         if (ep)
 668                                 break;
 669                 }
 670         }
 671         if (ep == NULL) {
 672                 err("no transfer endpoint found");
 673                 return NULL;
 674         }
 675         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 676                         i, ep->desc.bEndpointAddress);
 677         gspca_dev->alt = i;             /* memorize the current alt setting */
 678         if (gspca_dev->nbalt > 1) {
 679                 gspca_input_destroy_urb(gspca_dev);
 680                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 681                 if (ret < 0) {
 682                         err("set alt %d err %d", i, ret);
 683                         ep = NULL;
 684                 }
 685                 gspca_input_create_urb(gspca_dev);
 686         }
 687         return ep;
 688 }
 689
 690 /*
 691  * create the URBs for image transfer
 692  */
 693 static int create_urbs(struct gspca_dev *gspca_dev,
 694                         struct usb_host_endpoint *ep)
 695 {
 696         struct urb *urb;
 697         int n, nurbs, i, psize, npkt, bsize;
 698
 699         /* calculate the packet size and the number of packets */
 700         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 701
 702         if (!gspca_dev->cam.bulk) {             /* isoc */
 703
 704                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 705                 if (gspca_dev->pkt_size == 0)
 706                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 707                 else
 708                         psize = gspca_dev->pkt_size;
 709                 npkt = gspca_dev->cam.npkt;
 710                 if (npkt == 0)
 711                         npkt = 32;              /* default value */
 712                 bsize = psize * npkt;
 713                 PDEBUG(D_STREAM,
 714                         "isoc %d pkts size %d = bsize:%d",
 715                         npkt, psize, bsize);
 716                 nurbs = DEF_NURBS;
 717         } else {                                /* bulk */
 718                 npkt = 0;
 719                 bsize = gspca_dev->cam.bulk_size;
 720                 if (bsize == 0)
 721                         bsize = psize;
 722                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 723                 if (gspca_dev->cam.bulk_nurbs != 0)
 724                         nurbs = gspca_dev->cam.bulk_nurbs;
 725                 else
 726                         nurbs = 1;
 727         }
 728
 729         for (n = 0; n < nurbs; n++) {
 730                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 731                 if (!urb) {
 732                         err("usb_alloc_urb failed");
 733                         return -ENOMEM;
 734                 }
 735                 gspca_dev->urb[n] = urb;
 736                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 737                                                 bsize,
 738                                                 GFP_KERNEL,
 739                                                 &urb->transfer_dma);
 740
 741                 if (urb->transfer_buffer == NULL) {
 742                         err("usb_alloc_coherent failed");
 743                         return -ENOMEM;
 744                 }
 745                 urb->dev = gspca_dev->dev;
 746                 urb->context = gspca_dev;
 747                 urb->transfer_buffer_length = bsize;
 748                 if (npkt != 0) {                /* ISOC */
 749                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 750                                                     ep->desc.bEndpointAddress);
 751                         urb->transfer_flags = URB_ISO_ASAP
 752                                         | URB_NO_TRANSFER_DMA_MAP;
 753                         urb->interval = ep->desc.bInterval;
 754                         urb->complete = isoc_irq;
 755                         urb->number_of_packets = npkt;
 756                         for (i = 0; i < npkt; i++) {
 757                                 urb->iso_frame_desc[i].length = psize;
 758                                 urb->iso_frame_desc[i].offset = psize * i;
 759                         }
 760                 } else {                /* bulk */
 761                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 762                                                 ep->desc.bEndpointAddress),
 763                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 764                         urb->complete = bulk_irq;
 765                 }
 766         }
 767         return 0;
 768 }
 769
 770 /*
 771  * start the USB transfer
 772  */
 773 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 774 {
 775         struct usb_host_endpoint *ep;
 776         struct urb *urb;
 777         int n, ret;
 778
 779         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 780                 return -ERESTARTSYS;
 781
 782         if (!gspca_dev->present) {
 783                 ret = -ENODEV;
 784                 goto out;
 785         }
 786
 787         /* reset the streaming variables */
 788         gspca_dev->image = NULL;
 789         gspca_dev->image_len = 0;
 790         gspca_dev->last_packet_type = DISCARD_PACKET;
 791         gspca_dev->sequence = 0;
 792
 793         gspca_dev->usb_err = 0;
 794
 795         /* set the higher alternate setting and
 796          * loop until urb submit succeeds */
 797         if (gspca_dev->cam.reverse_alts)
 798                 gspca_dev->alt = 0;
 799         else
 800                 gspca_dev->alt = gspca_dev->nbalt;
 801
 802         if (gspca_dev->sd_desc->isoc_init) {
 803                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 804                 if (ret < 0)
 805                         goto out;
 806         }
 807         ep = get_ep(gspca_dev);
 808         if (ep == NULL) {
 809                 ret = -EIO;
 810                 goto out;
 811         }
 812         for (;;) {
 813                 if (!gspca_dev->cam.no_urb_create) {
 814                         PDEBUG(D_STREAM, "init transfer alt %d",
 815                                 gspca_dev->alt);
 816                         ret = create_urbs(gspca_dev, ep);
 817                         if (ret < 0) {
 818                                 destroy_urbs(gspca_dev);
 819                                 goto out;
 820                         }
 821                 }
 822
 823                 /* clear the bulk endpoint */
 824                 if (gspca_dev->cam.bulk)
 825                         usb_clear_halt(gspca_dev->dev,
 826                                         gspca_dev->urb[0]->pipe);
 827
 828                 /* start the cam */
 829                 ret = gspca_dev->sd_desc->start(gspca_dev);
 830                 if (ret < 0) {
 831                         destroy_urbs(gspca_dev);
 832                         goto out;
 833                 }
 834                 gspca_dev->streaming = 1;
 835
 836                 /* some bulk transfers are started by the subdriver */
 837                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 838                         break;
 839
 840                 /* submit the URBs */
 841                 for (n = 0; n < MAX_NURBS; n++) {
 842                         urb = gspca_dev->urb[n];
 843                         if (urb == NULL)
 844                                 break;
 845                         ret = usb_submit_urb(urb, GFP_KERNEL);
 846                         if (ret < 0)
 847                                 break;
 848                 }
 849                 if (ret >= 0)
 850                         break;
 851                 gspca_stream_off(gspca_dev);
 852                 if (ret != -ENOSPC) {
 853                         err("usb_submit_urb alt %d err %d",
 854                                 gspca_dev->alt, ret);
 855                         goto out;
 856                 }
 857
 858                 /* the bandwidth is not wide enough
 859                  * negociate or try a lower alternate setting */
 860                 PDEBUG(D_ERR|D_STREAM,
 861                         "bandwidth not wide enough - trying again");
 862                 msleep(20);     /* wait for kill complete */
 863                 if (gspca_dev->sd_desc->isoc_nego) {
 864                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 865                         if (ret < 0)
 866                                 goto out;
 867                 } else {
 868                         ep = get_ep(gspca_dev);
 869                         if (ep == NULL) {
 870                                 ret = -EIO;
 871                                 goto out;
 872                         }
 873                 }
 874         }
 875 out:
 876         mutex_unlock(&gspca_dev->usb_lock);
 877         return ret;
 878 }
 879
 880 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 881 {
 882         struct gspca_ctrl *ctrl;
 883         int i;
 884
 885         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 886         gspca_dev->curr_mode = i;
 887         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 888         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 889         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 890
 891         /* set the current control values to their default values
 892          * which may have changed in sd_init() */
 893         ctrl = gspca_dev->cam.ctrls;
 894         if (ctrl != NULL) {
 895                 for (i = 0;
 896                      i < gspca_dev->sd_desc->nctrls;
 897                      i++, ctrl++)
 898                         ctrl->val = ctrl->def;
 899         }
 900 }
 901
 902 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 903                         int width, int height)
 904 {
 905         int i;
 906
 907         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 908                 if (width >= gspca_dev->cam.cam_mode[i].width
 909                     && height >= gspca_dev->cam.cam_mode[i].height)
 910                         break;
 911         }
 912         return i;
 913 }
 914
 915 /*
 916  * search a mode with the right pixel format
 917  */
 918 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 919                         int mode,
 920                         int pixfmt)
 921 {
 922         int modeU, modeD;
 923
 924         modeU = modeD = mode;
 925         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 926                 if (--modeD >= 0) {
 927                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 928                                                                 == pixfmt)
 929                                 return modeD;
 930                 }
 931                 if (++modeU < gspca_dev->cam.nmodes) {
 932                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 933                                                                 == pixfmt)
 934                                 return modeU;
 935                 }
 936         }
 937         return -EINVAL;
 938 }
 939
 940 #ifdef CONFIG_VIDEO_ADV_DEBUG
 941 static int vidioc_g_register(struct file *file, void *priv,
 942                         struct v4l2_dbg_register *reg)
 943 {
 944         int ret;
 945         struct gspca_dev *gspca_dev = priv;
 946
 947         if (!gspca_dev->sd_desc->get_chip_ident)
 948                 return -EINVAL;
 949
 950         if (!gspca_dev->sd_desc->get_register)
 951                 return -EINVAL;
 952
 953         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 954                 return -ERESTARTSYS;
 955         gspca_dev->usb_err = 0;
 956         if (gspca_dev->present)
 957                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 958         else
 959                 ret = -ENODEV;
 960         mutex_unlock(&gspca_dev->usb_lock);
 961
 962         return ret;
 963 }
 964
 965 static int vidioc_s_register(struct file *file, void *priv,
 966                         struct v4l2_dbg_register *reg)
 967 {
 968         int ret;
 969         struct gspca_dev *gspca_dev = priv;
 970
 971         if (!gspca_dev->sd_desc->get_chip_ident)
 972                 return -EINVAL;
 973
 974         if (!gspca_dev->sd_desc->set_register)
 975                 return -EINVAL;
 976
 977         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 978                 return -ERESTARTSYS;
 979         gspca_dev->usb_err = 0;
 980         if (gspca_dev->present)
 981                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 982         else
 983                 ret = -ENODEV;
 984         mutex_unlock(&gspca_dev->usb_lock);
 985
 986         return ret;
 987 }
 988 #endif
 989
 990 static int vidioc_g_chip_ident(struct file *file, void *priv,
 991                         struct v4l2_dbg_chip_ident *chip)
 992 {
 993         int ret;
 994         struct gspca_dev *gspca_dev = priv;
 995
 996         if (!gspca_dev->sd_desc->get_chip_ident)
 997                 return -EINVAL;
 998
 999         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1000                 return -ERESTARTSYS;
1001         gspca_dev->usb_err = 0;
1002         if (gspca_dev->present)
1003                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1004         else
1005                 ret = -ENODEV;
1006         mutex_unlock(&gspca_dev->usb_lock);
1007
1008         return ret;
1009 }
1010
1011 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1012                                 struct v4l2_fmtdesc *fmtdesc)
1013 {
1014         struct gspca_dev *gspca_dev = priv;
1015         int i, j, index;
1016         __u32 fmt_tb[8];
1017
1018         /* give an index to each format */
1019         index = 0;
1020         j = 0;
1021         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1022                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1023                 j = 0;
1024                 for (;;) {
1025                         if (fmt_tb[j] == fmt_tb[index])
1026                                 break;
1027                         j++;
1028                 }
1029                 if (j == index) {
1030                         if (fmtdesc->index == index)
1031                                 break;          /* new format */
1032                         index++;
1033                         if (index >= ARRAY_SIZE(fmt_tb))
1034                                 return -EINVAL;
1035                 }
1036         }
1037         if (i < 0)
1038                 return -EINVAL;         /* no more format */
1039
1040         fmtdesc->pixelformat = fmt_tb[index];
1041         if (gspca_is_compressed(fmt_tb[index]))
1042                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1043         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1044         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1045         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1046         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1047         fmtdesc->description[4] = '\0';
1048         return 0;
1049 }
1050
1051 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1052                             struct v4l2_format *fmt)
1053 {
1054         struct gspca_dev *gspca_dev = priv;
1055         int mode;
1056
1057         mode = gspca_dev->curr_mode;
1058         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1059                 sizeof fmt->fmt.pix);
1060         return 0;
1061 }
1062
1063 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1064                         struct v4l2_format *fmt)
1065 {
1066         int w, h, mode, mode2;
1067
1068         w = fmt->fmt.pix.width;
1069         h = fmt->fmt.pix.height;
1070
1071 #ifdef GSPCA_DEBUG
1072         if (gspca_debug & D_CONF)
1073                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1074 #endif
1075         /* search the closest mode for width and height */
1076         mode = wxh_to_mode(gspca_dev, w, h);
1077
1078         /* OK if right palette */
1079         if (gspca_dev->cam.cam_mode[mode].pixelformat
1080                                                 != fmt->fmt.pix.pixelformat) {
1081
1082                 /* else, search the closest mode with the same pixel format */
1083                 mode2 = gspca_get_mode(gspca_dev, mode,
1084                                         fmt->fmt.pix.pixelformat);
1085                 if (mode2 >= 0)
1086                         mode = mode2;
1087 /*              else
1088                         ;                * no chance, return this mode */
1089         }
1090         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1091                 sizeof fmt->fmt.pix);
1092         return mode;                    /* used when s_fmt */
1093 }
1094
1095 static int vidioc_try_fmt_vid_cap(struct file *file,
1096                               void *priv,
1097                               struct v4l2_format *fmt)
1098 {
1099         struct gspca_dev *gspca_dev = priv;
1100         int ret;
1101
1102         ret = try_fmt_vid_cap(gspca_dev, fmt);
1103         if (ret < 0)
1104                 return ret;
1105         return 0;
1106 }
1107
1108 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1109                             struct v4l2_format *fmt)
1110 {
1111         struct gspca_dev *gspca_dev = priv;
1112         int ret;
1113
1114         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1115                 return -ERESTARTSYS;
1116
1117         ret = try_fmt_vid_cap(gspca_dev, fmt);
1118         if (ret < 0)
1119                 goto out;
1120
1121         if (gspca_dev->nframes != 0
1122             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1123                 ret = -EINVAL;
1124                 goto out;
1125         }
1126
1127         if (ret == gspca_dev->curr_mode) {
1128                 ret = 0;
1129                 goto out;                       /* same mode */
1130         }
1131
1132         if (gspca_dev->streaming) {
1133                 ret = -EBUSY;
1134                 goto out;
1135         }
1136         gspca_dev->width = fmt->fmt.pix.width;
1137         gspca_dev->height = fmt->fmt.pix.height;
1138         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1139         gspca_dev->curr_mode = ret;
1140
1141         ret = 0;
1142 out:
1143         mutex_unlock(&gspca_dev->queue_lock);
1144         return ret;
1145 }
1146
1147 static int vidioc_enum_framesizes(struct file *file, void *priv,
1148                                   struct v4l2_frmsizeenum *fsize)
1149 {
1150         struct gspca_dev *gspca_dev = priv;
1151         int i;
1152         __u32 index = 0;
1153
1154         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1155                 if (fsize->pixel_format !=
1156                                 gspca_dev->cam.cam_mode[i].pixelformat)
1157                         continue;
1158
1159                 if (fsize->index == index) {
1160                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1161                         fsize->discrete.width =
1162                                 gspca_dev->cam.cam_mode[i].width;
1163                         fsize->discrete.height =
1164                                 gspca_dev->cam.cam_mode[i].height;
1165                         return 0;
1166                 }
1167                 index++;
1168         }
1169
1170         return -EINVAL;
1171 }
1172
1173 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1174                                       struct v4l2_frmivalenum *fival)
1175 {
1176         struct gspca_dev *gspca_dev = priv;
1177         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1178         __u32 i;
1179
1180         if (gspca_dev->cam.mode_framerates == NULL ||
1181                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1182                 return -EINVAL;
1183
1184         if (fival->pixel_format !=
1185                         gspca_dev->cam.cam_mode[mode].pixelformat)
1186                 return -EINVAL;
1187
1188         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1189                 if (fival->index == i) {
1190                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1191                         fival->discrete.numerator = 1;
1192                         fival->discrete.denominator =
1193                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1194                         return 0;
1195                 }
1196         }
1197
1198         return -EINVAL;
1199 }
1200
1201 static void gspca_release(struct video_device *vfd)
1202 {
1203         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1204
1205         PDEBUG(D_PROBE, "%s released",
1206                 video_device_node_name(&gspca_dev->vdev));
1207
1208         kfree(gspca_dev->usb_buf);
1209         kfree(gspca_dev);
1210 }
1211
1212 static int dev_open(struct file *file)
1213 {
1214         struct gspca_dev *gspca_dev;
1215         int ret;
1216
1217         PDEBUG(D_STREAM, "[%s] open", current->comm);
1218         gspca_dev = (struct gspca_dev *) video_devdata(file);
1219         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1220                 return -ERESTARTSYS;
1221         if (!gspca_dev->present) {
1222                 ret = -ENODEV;
1223                 goto out;
1224         }
1225
1226         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1227                 ret = -EBUSY;
1228                 goto out;
1229         }
1230
1231         /* protect the subdriver against rmmod */
1232         if (!try_module_get(gspca_dev->module)) {
1233                 ret = -ENODEV;
1234                 goto out;
1235         }
1236
1237         gspca_dev->users++;
1238
1239         file->private_data = gspca_dev;
1240 #ifdef GSPCA_DEBUG
1241         /* activate the v4l2 debug */
1242         if (gspca_debug & D_V4L2)
1243                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1244                                         | V4L2_DEBUG_IOCTL_ARG;
1245         else
1246                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1247                                         | V4L2_DEBUG_IOCTL_ARG);
1248 #endif
1249         ret = 0;
1250 out:
1251         mutex_unlock(&gspca_dev->queue_lock);
1252         if (ret != 0)
1253                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1254         else
1255                 PDEBUG(D_STREAM, "open done");
1256         return ret;
1257 }
1258
1259 static int dev_close(struct file *file)
1260 {
1261         struct gspca_dev *gspca_dev = file->private_data;
1262
1263         PDEBUG(D_STREAM, "[%s] close", current->comm);
1264         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1265                 return -ERESTARTSYS;
1266         gspca_dev->users--;
1267
1268         /* if the file did the capture, free the streaming resources */
1269         if (gspca_dev->capt_file == file) {
1270                 if (gspca_dev->streaming) {
1271                         mutex_lock(&gspca_dev->usb_lock);
1272                         gspca_dev->usb_err = 0;
1273                         gspca_stream_off(gspca_dev);
1274                         mutex_unlock(&gspca_dev->usb_lock);
1275                 }
1276                 frame_free(gspca_dev);
1277                 gspca_dev->capt_file = NULL;
1278                 gspca_dev->memory = GSPCA_MEMORY_NO;
1279         }
1280         file->private_data = NULL;
1281         module_put(gspca_dev->module);
1282         mutex_unlock(&gspca_dev->queue_lock);
1283
1284         PDEBUG(D_STREAM, "close done");
1285
1286         return 0;
1287 }
1288
1289 static int vidioc_querycap(struct file *file, void  *priv,
1290                            struct v4l2_capability *cap)
1291 {
1292         struct gspca_dev *gspca_dev = priv;
1293         int ret;
1294
1295         /* protect the access to the usb device */
1296         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1297                 return -ERESTARTSYS;
1298         if (!gspca_dev->present) {
1299                 ret = -ENODEV;
1300                 goto out;
1301         }
1302         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1303         if (gspca_dev->dev->product != NULL) {
1304                 strncpy(cap->card, gspca_dev->dev->product,
1305                         sizeof cap->card);
1306         } else {
1307                 snprintf(cap->card, sizeof cap->card,
1308                         "USB Camera (%04x:%04x)",
1309                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1310                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1311         }
1312         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1313         cap->version = DRIVER_VERSION_NUMBER;
1314         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1315                           | V4L2_CAP_STREAMING
1316                           | V4L2_CAP_READWRITE;
1317         ret = 0;
1318 out:
1319         mutex_unlock(&gspca_dev->usb_lock);
1320         return ret;
1321 }
1322
1323 static int get_ctrl(struct gspca_dev *gspca_dev,
1324                                    int id)
1325 {
1326         const struct ctrl *ctrls;
1327         int i;
1328
1329         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1330              i < gspca_dev->sd_desc->nctrls;
1331              i++, ctrls++) {
1332                 if (gspca_dev->ctrl_dis & (1 << i))
1333                         continue;
1334                 if (id == ctrls->qctrl.id)
1335                         return i;
1336         }
1337         return -1;
1338 }
1339
1340 static int vidioc_queryctrl(struct file *file, void *priv,
1341                            struct v4l2_queryctrl *q_ctrl)
1342 {
1343         struct gspca_dev *gspca_dev = priv;
1344         const struct ctrl *ctrls;
1345         struct gspca_ctrl *gspca_ctrl;
1346         int i, idx;
1347         u32 id;
1348
1349         id = q_ctrl->id;
1350         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1351                 id &= V4L2_CTRL_ID_MASK;
1352                 id++;
1353                 idx = -1;
1354                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1355                         if (gspca_dev->ctrl_dis & (1 << i))
1356                                 continue;
1357                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1358                                 continue;
1359                         if (idx >= 0
1360                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1361                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1362                                 continue;
1363                         idx = i;
1364                 }
1365         } else {
1366                 idx = get_ctrl(gspca_dev, id);
1367         }
1368         if (idx < 0)
1369                 return -EINVAL;
1370         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1371         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1372         if (gspca_dev->cam.ctrls != NULL) {
1373                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1374                 q_ctrl->default_value = gspca_ctrl->def;
1375                 q_ctrl->minimum = gspca_ctrl->min;
1376                 q_ctrl->maximum = gspca_ctrl->max;
1377         }
1378         if (gspca_dev->ctrl_inac & (1 << idx))
1379                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1380         return 0;
1381 }
1382
1383 static int vidioc_s_ctrl(struct file *file, void *priv,
1384                          struct v4l2_control *ctrl)
1385 {
1386         struct gspca_dev *gspca_dev = priv;
1387         const struct ctrl *ctrls;
1388         struct gspca_ctrl *gspca_ctrl;
1389         int idx, ret;
1390
1391         idx = get_ctrl(gspca_dev, ctrl->id);
1392         if (idx < 0)
1393                 return -EINVAL;
1394         if (gspca_dev->ctrl_inac & (1 << idx))
1395                 return -EINVAL;
1396         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1397         if (gspca_dev->cam.ctrls != NULL) {
1398                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1399                 if (ctrl->value < gspca_ctrl->min
1400                     || ctrl->value > gspca_ctrl->max)
1401                         return -ERANGE;
1402         } else {
1403                 gspca_ctrl = NULL;
1404                 if (ctrl->value < ctrls->qctrl.minimum
1405                     || ctrl->value > ctrls->qctrl.maximum)
1406                         return -ERANGE;
1407         }
1408         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1409         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1410                 return -ERESTARTSYS;
1411         if (!gspca_dev->present) {
1412                 ret = -ENODEV;
1413                 goto out;
1414         }
1415         gspca_dev->usb_err = 0;
1416         if (ctrls->set != NULL) {
1417                 ret = ctrls->set(gspca_dev, ctrl->value);
1418                 goto out;
1419         }
1420         if (gspca_ctrl != NULL) {
1421                 gspca_ctrl->val = ctrl->value;
1422                 if (ctrls->set_control != NULL
1423                  && gspca_dev->streaming)
1424                         ctrls->set_control(gspca_dev);
1425         }
1426         ret = gspca_dev->usb_err;
1427 out:
1428         mutex_unlock(&gspca_dev->usb_lock);
1429         return ret;
1430 }
1431
1432 static int vidioc_g_ctrl(struct file *file, void *priv,
1433                          struct v4l2_control *ctrl)
1434 {
1435         struct gspca_dev *gspca_dev = priv;
1436         const struct ctrl *ctrls;
1437         int idx, ret;
1438
1439         idx = get_ctrl(gspca_dev, ctrl->id);
1440         if (idx < 0)
1441                 return -EINVAL;
1442         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1443
1444         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1445                 return -ERESTARTSYS;
1446         if (!gspca_dev->present) {
1447                 ret = -ENODEV;
1448                 goto out;
1449         }
1450         gspca_dev->usb_err = 0;
1451         if (ctrls->get != NULL) {
1452                 ret = ctrls->get(gspca_dev, &ctrl->value);
1453                 goto out;
1454         }
1455         if (gspca_dev->cam.ctrls != NULL)
1456                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1457         ret = 0;
1458 out:
1459         mutex_unlock(&gspca_dev->usb_lock);
1460         return ret;
1461 }
1462
1463 static int vidioc_querymenu(struct file *file, void *priv,
1464                             struct v4l2_querymenu *qmenu)
1465 {
1466         struct gspca_dev *gspca_dev = priv;
1467
1468         if (!gspca_dev->sd_desc->querymenu)
1469                 return -EINVAL;
1470         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1471 }
1472
1473 static int vidioc_enum_input(struct file *file, void *priv,
1474                                 struct v4l2_input *input)
1475 {
1476         struct gspca_dev *gspca_dev = priv;
1477
1478         if (input->index != 0)
1479                 return -EINVAL;
1480         input->type = V4L2_INPUT_TYPE_CAMERA;
1481         input->status = gspca_dev->cam.input_flags;
1482         strncpy(input->name, gspca_dev->sd_desc->name,
1483                 sizeof input->name);
1484         return 0;
1485 }
1486
1487 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1488 {
1489         *i = 0;
1490         return 0;
1491 }
1492
1493 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1494 {
1495         if (i > 0)
1496                 return -EINVAL;
1497         return (0);
1498 }
1499
1500 static int vidioc_reqbufs(struct file *file, void *priv,
1501                           struct v4l2_requestbuffers *rb)
1502 {
1503         struct gspca_dev *gspca_dev = priv;
1504         int i, ret = 0, streaming;
1505
1506         i = rb->memory;                 /* (avoid compilation warning) */
1507         switch (i) {
1508         case GSPCA_MEMORY_READ:                 /* (internal call) */
1509         case V4L2_MEMORY_MMAP:
1510         case V4L2_MEMORY_USERPTR:
1511                 break;
1512         default:
1513                 return -EINVAL;
1514         }
1515         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1516                 return -ERESTARTSYS;
1517
1518         if (gspca_dev->memory != GSPCA_MEMORY_NO
1519             && gspca_dev->memory != rb->memory) {
1520                 ret = -EBUSY;
1521                 goto out;
1522         }
1523
1524         /* only one file may do the capture */
1525         if (gspca_dev->capt_file != NULL
1526             && gspca_dev->capt_file != file) {
1527                 ret = -EBUSY;
1528                 goto out;
1529         }
1530
1531         /* if allocated, the buffers must not be mapped */
1532         for (i = 0; i < gspca_dev->nframes; i++) {
1533                 if (gspca_dev->frame[i].vma_use_count) {
1534                         ret = -EBUSY;
1535                         goto out;
1536                 }
1537         }
1538
1539         /* stop streaming */
1540         streaming = gspca_dev->streaming;
1541         if (streaming) {
1542                 mutex_lock(&gspca_dev->usb_lock);
1543                 gspca_dev->usb_err = 0;
1544                 gspca_stream_off(gspca_dev);
1545                 mutex_unlock(&gspca_dev->usb_lock);
1546         }
1547
1548         /* free the previous allocated buffers, if any */
1549         if (gspca_dev->nframes != 0) {
1550                 frame_free(gspca_dev);
1551                 gspca_dev->capt_file = NULL;
1552         }
1553         if (rb->count == 0)                     /* unrequest */
1554                 goto out;
1555         gspca_dev->memory = rb->memory;
1556         ret = frame_alloc(gspca_dev, rb->count);
1557         if (ret == 0) {
1558                 rb->count = gspca_dev->nframes;
1559                 gspca_dev->capt_file = file;
1560                 if (streaming)
1561                         ret = gspca_init_transfer(gspca_dev);
1562         }
1563 out:
1564         mutex_unlock(&gspca_dev->queue_lock);
1565         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1566         return ret;
1567 }
1568
1569 static int vidioc_querybuf(struct file *file, void *priv,
1570                            struct v4l2_buffer *v4l2_buf)
1571 {
1572         struct gspca_dev *gspca_dev = priv;
1573         struct gspca_frame *frame;
1574
1575         if (v4l2_buf->index < 0
1576             || v4l2_buf->index >= gspca_dev->nframes)
1577                 return -EINVAL;
1578
1579         frame = &gspca_dev->frame[v4l2_buf->index];
1580         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1581         return 0;
1582 }
1583
1584 static int vidioc_streamon(struct file *file, void *priv,
1585                            enum v4l2_buf_type buf_type)
1586 {
1587         struct gspca_dev *gspca_dev = priv;
1588         int ret;
1589
1590         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1591                 return -EINVAL;
1592         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1593                 return -ERESTARTSYS;
1594
1595         /* check the capture file */
1596         if (gspca_dev->capt_file != file) {
1597                 ret = -EBUSY;
1598                 goto out;
1599         }
1600
1601         if (gspca_dev->nframes == 0
1602             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1603                 ret = -EINVAL;
1604                 goto out;
1605         }
1606         if (!gspca_dev->streaming) {
1607                 ret = gspca_init_transfer(gspca_dev);
1608                 if (ret < 0)
1609                         goto out;
1610         }
1611 #ifdef GSPCA_DEBUG
1612         if (gspca_debug & D_STREAM) {
1613                 PDEBUG_MODE("stream on OK",
1614                         gspca_dev->pixfmt,
1615                         gspca_dev->width,
1616                         gspca_dev->height);
1617         }
1618 #endif
1619         ret = 0;
1620 out:
1621         mutex_unlock(&gspca_dev->queue_lock);
1622         return ret;
1623 }
1624
1625 static int vidioc_streamoff(struct file *file, void *priv,
1626                                 enum v4l2_buf_type buf_type)
1627 {
1628         struct gspca_dev *gspca_dev = priv;
1629         int ret;
1630
1631         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1632                 return -EINVAL;
1633         if (!gspca_dev->streaming)
1634                 return 0;
1635         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1636                 return -ERESTARTSYS;
1637
1638         /* check the capture file */
1639         if (gspca_dev->capt_file != file) {
1640                 ret = -EBUSY;
1641                 goto out;
1642         }
1643
1644         /* stop streaming */
1645         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1646                 ret = -ERESTARTSYS;
1647                 goto out;
1648         }
1649         gspca_dev->usb_err = 0;
1650         gspca_stream_off(gspca_dev);
1651         mutex_unlock(&gspca_dev->usb_lock);
1652
1653         /* empty the transfer queues */
1654         atomic_set(&gspca_dev->fr_q, 0);
1655         atomic_set(&gspca_dev->fr_i, 0);
1656         gspca_dev->fr_o = 0;
1657         ret = 0;
1658 out:
1659         mutex_unlock(&gspca_dev->queue_lock);
1660         return ret;
1661 }
1662
1663 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1664                         struct v4l2_jpegcompression *jpegcomp)
1665 {
1666         struct gspca_dev *gspca_dev = priv;
1667         int ret;
1668
1669         if (!gspca_dev->sd_desc->get_jcomp)
1670                 return -EINVAL;
1671         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1672                 return -ERESTARTSYS;
1673         gspca_dev->usb_err = 0;
1674         if (gspca_dev->present)
1675                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1676         else
1677                 ret = -ENODEV;
1678         mutex_unlock(&gspca_dev->usb_lock);
1679         return ret;
1680 }
1681
1682 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1683                         struct v4l2_jpegcompression *jpegcomp)
1684 {
1685         struct gspca_dev *gspca_dev = priv;
1686         int ret;
1687
1688         if (!gspca_dev->sd_desc->set_jcomp)
1689                 return -EINVAL;
1690         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1691                 return -ERESTARTSYS;
1692         gspca_dev->usb_err = 0;
1693         if (gspca_dev->present)
1694                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1695         else
1696                 ret = -ENODEV;
1697         mutex_unlock(&gspca_dev->usb_lock);
1698         return ret;
1699 }
1700
1701 static int vidioc_g_parm(struct file *filp, void *priv,
1702                         struct v4l2_streamparm *parm)
1703 {
1704         struct gspca_dev *gspca_dev = priv;
1705
1706         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1707
1708         if (gspca_dev->sd_desc->get_streamparm) {
1709                 int ret;
1710
1711                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1712                         return -ERESTARTSYS;
1713                 gspca_dev->usb_err = 0;
1714                 if (gspca_dev->present)
1715                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1716                                                                  parm);
1717                 else
1718                         ret = -ENODEV;
1719                 mutex_unlock(&gspca_dev->usb_lock);
1720                 return ret;
1721         }
1722
1723         return 0;
1724 }
1725
1726 static int vidioc_s_parm(struct file *filp, void *priv,
1727                         struct v4l2_streamparm *parm)
1728 {
1729         struct gspca_dev *gspca_dev = priv;
1730         int n;
1731
1732         n = parm->parm.capture.readbuffers;
1733         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1734                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1735         else
1736                 gspca_dev->nbufread = n;
1737
1738         if (gspca_dev->sd_desc->set_streamparm) {
1739                 int ret;
1740
1741                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1742                         return -ERESTARTSYS;
1743                 gspca_dev->usb_err = 0;
1744                 if (gspca_dev->present)
1745                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1746                                                                  parm);
1747                 else
1748                         ret = -ENODEV;
1749                 mutex_unlock(&gspca_dev->usb_lock);
1750                 return ret;
1751         }
1752
1753         return 0;
1754 }
1755
1756 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1757 {
1758         struct gspca_dev *gspca_dev = file->private_data;
1759         struct gspca_frame *frame;
1760         struct page *page;
1761         unsigned long addr, start, size;
1762         int i, ret;
1763
1764         start = vma->vm_start;
1765         size = vma->vm_end - vma->vm_start;
1766         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1767
1768         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1769                 return -ERESTARTSYS;
1770         if (!gspca_dev->present) {
1771                 ret = -ENODEV;
1772                 goto out;
1773         }
1774         if (gspca_dev->capt_file != file) {
1775                 ret = -EINVAL;
1776                 goto out;
1777         }
1778
1779         frame = NULL;
1780         for (i = 0; i < gspca_dev->nframes; ++i) {
1781                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1782                         PDEBUG(D_STREAM, "mmap bad memory type");
1783                         break;
1784                 }
1785                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1786                                                 == vma->vm_pgoff) {
1787                         frame = &gspca_dev->frame[i];
1788                         break;
1789                 }
1790         }
1791         if (frame == NULL) {
1792                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1793                 ret = -EINVAL;
1794                 goto out;
1795         }
1796         if (size != frame->v4l2_buf.length) {
1797                 PDEBUG(D_STREAM, "mmap bad size");
1798                 ret = -EINVAL;
1799                 goto out;
1800         }
1801
1802         /*
1803          * - VM_IO marks the area as being a mmaped region for I/O to a
1804          *   device. It also prevents the region from being core dumped.
1805          */
1806         vma->vm_flags |= VM_IO;
1807
1808         addr = (unsigned long) frame->data;
1809         while (size > 0) {
1810                 page = vmalloc_to_page((void *) addr);
1811                 ret = vm_insert_page(vma, start, page);
1812                 if (ret < 0)
1813                         goto out;
1814                 start += PAGE_SIZE;
1815                 addr += PAGE_SIZE;
1816                 size -= PAGE_SIZE;
1817         }
1818
1819         vma->vm_ops = &gspca_vm_ops;
1820         vma->vm_private_data = frame;
1821         gspca_vm_open(vma);
1822         ret = 0;
1823 out:
1824         mutex_unlock(&gspca_dev->queue_lock);
1825         return ret;
1826 }
1827
1828 /*
1829  * wait for a video frame
1830  *
1831  * If a frame is ready, its index is returned.
1832  */
1833 static int frame_wait(struct gspca_dev *gspca_dev,
1834                         int nonblock_ing)
1835 {
1836         int i, ret;
1837
1838         /* check if a frame is ready */
1839         i = gspca_dev->fr_o;
1840         if (i == atomic_read(&gspca_dev->fr_i)) {
1841                 if (nonblock_ing)
1842                         return -EAGAIN;
1843
1844                 /* wait till a frame is ready */
1845                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1846                         i != atomic_read(&gspca_dev->fr_i) ||
1847                         !gspca_dev->streaming || !gspca_dev->present,
1848                         msecs_to_jiffies(3000));
1849                 if (ret < 0)
1850                         return ret;
1851                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1852                         return -EIO;
1853         }
1854
1855         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1856
1857         if (gspca_dev->sd_desc->dq_callback) {
1858                 mutex_lock(&gspca_dev->usb_lock);
1859                 gspca_dev->usb_err = 0;
1860                 if (gspca_dev->present)
1861                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1862                 mutex_unlock(&gspca_dev->usb_lock);
1863         }
1864         return gspca_dev->fr_queue[i];
1865 }
1866
1867 /*
1868  * dequeue a video buffer
1869  *
1870  * If nonblock_ing is false, block until a buffer is available.
1871  */
1872 static int vidioc_dqbuf(struct file *file, void *priv,
1873                         struct v4l2_buffer *v4l2_buf)
1874 {
1875         struct gspca_dev *gspca_dev = priv;
1876         struct gspca_frame *frame;
1877         int i, ret;
1878
1879         PDEBUG(D_FRAM, "dqbuf");
1880         if (v4l2_buf->memory != gspca_dev->memory)
1881                 return -EINVAL;
1882
1883         if (!gspca_dev->present)
1884                 return -ENODEV;
1885
1886         /* if not streaming, be sure the application will not loop forever */
1887         if (!(file->f_flags & O_NONBLOCK)
1888             && !gspca_dev->streaming && gspca_dev->users == 1)
1889                 return -EINVAL;
1890
1891         /* only the capturing file may dequeue */
1892         if (gspca_dev->capt_file != file)
1893                 return -EINVAL;
1894
1895         /* only one dequeue / read at a time */
1896         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1897                 return -ERESTARTSYS;
1898
1899         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1900         if (ret < 0)
1901                 goto out;
1902         i = ret;                                /* frame index */
1903         frame = &gspca_dev->frame[i];
1904         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1905                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1906                                  frame->data,
1907                                  frame->v4l2_buf.bytesused)) {
1908                         PDEBUG(D_ERR|D_STREAM,
1909                                 "dqbuf cp to user failed");
1910                         ret = -EFAULT;
1911                         goto out;
1912                 }
1913         }
1914         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1915         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1916         PDEBUG(D_FRAM, "dqbuf %d", i);
1917         ret = 0;
1918 out:
1919         mutex_unlock(&gspca_dev->read_lock);
1920         return ret;
1921 }
1922
1923 /*
1924  * queue a video buffer
1925  *
1926  * Attempting to queue a buffer that has already been
1927  * queued will return -EINVAL.
1928  */
1929 static int vidioc_qbuf(struct file *file, void *priv,
1930                         struct v4l2_buffer *v4l2_buf)
1931 {
1932         struct gspca_dev *gspca_dev = priv;
1933         struct gspca_frame *frame;
1934         int i, index, ret;
1935
1936         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1937
1938         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1939                 return -ERESTARTSYS;
1940
1941         index = v4l2_buf->index;
1942         if ((unsigned) index >= gspca_dev->nframes) {
1943                 PDEBUG(D_FRAM,
1944                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1945                 ret = -EINVAL;
1946                 goto out;
1947         }
1948         if (v4l2_buf->memory != gspca_dev->memory) {
1949                 PDEBUG(D_FRAM, "qbuf bad memory type");
1950                 ret = -EINVAL;
1951                 goto out;
1952         }
1953
1954         frame = &gspca_dev->frame[index];
1955         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1956                 PDEBUG(D_FRAM, "qbuf bad state");
1957                 ret = -EINVAL;
1958                 goto out;
1959         }
1960
1961         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1962
1963         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1964                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1965                 frame->v4l2_buf.length = v4l2_buf->length;
1966         }
1967
1968         /* put the buffer in the 'queued' queue */
1969         i = atomic_read(&gspca_dev->fr_q);
1970         gspca_dev->fr_queue[i] = index;
1971         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1972
1973         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1974         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1975         ret = 0;
1976 out:
1977         mutex_unlock(&gspca_dev->queue_lock);
1978         return ret;
1979 }
1980
1981 /*
1982  * allocate the resources for read()
1983  */
1984 static int read_alloc(struct gspca_dev *gspca_dev,
1985                         struct file *file)
1986 {
1987         struct v4l2_buffer v4l2_buf;
1988         int i, ret;
1989
1990         PDEBUG(D_STREAM, "read alloc");
1991         if (gspca_dev->nframes == 0) {
1992                 struct v4l2_requestbuffers rb;
1993
1994                 memset(&rb, 0, sizeof rb);
1995                 rb.count = gspca_dev->nbufread;
1996                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1997                 rb.memory = GSPCA_MEMORY_READ;
1998                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1999                 if (ret != 0) {
2000                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2001                         return ret;
2002                 }
2003                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2004                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2005                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2006                 for (i = 0; i < gspca_dev->nbufread; i++) {
2007                         v4l2_buf.index = i;
2008                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2009                         if (ret != 0) {
2010                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2011                                 return ret;
2012                         }
2013                 }
2014                 gspca_dev->memory = GSPCA_MEMORY_READ;
2015         }
2016
2017         /* start streaming */
2018         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2019         if (ret != 0)
2020                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2021         return ret;
2022 }
2023
2024 static unsigned int dev_poll(struct file *file, poll_table *wait)
2025 {
2026         struct gspca_dev *gspca_dev = file->private_data;
2027         int ret;
2028
2029         PDEBUG(D_FRAM, "poll");
2030
2031         poll_wait(file, &gspca_dev->wq, wait);
2032
2033         /* if reqbufs is not done, the user would use read() */
2034         if (gspca_dev->nframes == 0) {
2035                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2036                         return POLLERR;         /* not the 1st time */
2037                 ret = read_alloc(gspca_dev, file);
2038                 if (ret != 0)
2039                         return POLLERR;
2040         }
2041
2042         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2043                 return POLLERR;
2044
2045         /* check if an image has been received */
2046         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2047                 ret = POLLIN | POLLRDNORM;      /* yes */
2048         else
2049                 ret = 0;
2050         mutex_unlock(&gspca_dev->queue_lock);
2051         if (!gspca_dev->present)
2052                 return POLLHUP;
2053         return ret;
2054 }
2055
2056 static ssize_t dev_read(struct file *file, char __user *data,
2057                     size_t count, loff_t *ppos)
2058 {
2059         struct gspca_dev *gspca_dev = file->private_data;
2060         struct gspca_frame *frame;
2061         struct v4l2_buffer v4l2_buf;
2062         struct timeval timestamp;
2063         int n, ret, ret2;
2064
2065         PDEBUG(D_FRAM, "read (%zd)", count);
2066         if (!gspca_dev->present)
2067                 return -ENODEV;
2068         switch (gspca_dev->memory) {
2069         case GSPCA_MEMORY_NO:                   /* first time */
2070                 ret = read_alloc(gspca_dev, file);
2071                 if (ret != 0)
2072                         return ret;
2073                 break;
2074         case GSPCA_MEMORY_READ:
2075                 if (gspca_dev->capt_file == file)
2076                         break;
2077                 /* fall thru */
2078         default:
2079                 return -EINVAL;
2080         }
2081
2082         /* get a frame */
2083         timestamp = ktime_to_timeval(ktime_get());
2084         timestamp.tv_sec--;
2085         n = 2;
2086         for (;;) {
2087                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2088                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2089                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2090                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2091                 if (ret != 0) {
2092                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2093                         return ret;
2094                 }
2095
2096                 /* if the process slept for more than 1 second,
2097                  * get a newer frame */
2098                 frame = &gspca_dev->frame[v4l2_buf.index];
2099                 if (--n < 0)
2100                         break;                  /* avoid infinite loop */
2101                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2102                         break;
2103                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2104                 if (ret != 0) {
2105                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2106                         return ret;
2107                 }
2108         }
2109
2110         /* copy the frame */
2111         if (count > frame->v4l2_buf.bytesused)
2112                 count = frame->v4l2_buf.bytesused;
2113         ret = copy_to_user(data, frame->data, count);
2114         if (ret != 0) {
2115                 PDEBUG(D_ERR|D_STREAM,
2116                         "read cp to user lack %d / %zd", ret, count);
2117                 ret = -EFAULT;
2118                 goto out;
2119         }
2120         ret = count;
2121 out:
2122         /* in each case, requeue the buffer */
2123         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2124         if (ret2 != 0)
2125                 return ret2;
2126         return ret;
2127 }
2128
2129 static struct v4l2_file_operations dev_fops = {
2130         .owner = THIS_MODULE,
2131         .open = dev_open,
2132         .release = dev_close,
2133         .read = dev_read,
2134         .mmap = dev_mmap,
2135         .unlocked_ioctl = video_ioctl2,
2136         .poll   = dev_poll,
2137 };
2138
2139 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2140         .vidioc_querycap        = vidioc_querycap,
2141         .vidioc_dqbuf           = vidioc_dqbuf,
2142         .vidioc_qbuf            = vidioc_qbuf,
2143         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2144         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2145         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2146         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2147         .vidioc_streamon        = vidioc_streamon,
2148         .vidioc_queryctrl       = vidioc_queryctrl,
2149         .vidioc_g_ctrl          = vidioc_g_ctrl,
2150         .vidioc_s_ctrl          = vidioc_s_ctrl,
2151         .vidioc_querymenu       = vidioc_querymenu,
2152         .vidioc_enum_input      = vidioc_enum_input,
2153         .vidioc_g_input         = vidioc_g_input,
2154         .vidioc_s_input         = vidioc_s_input,
2155         .vidioc_reqbufs         = vidioc_reqbufs,
2156         .vidioc_querybuf        = vidioc_querybuf,
2157         .vidioc_streamoff       = vidioc_streamoff,
2158         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2159         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2160         .vidioc_g_parm          = vidioc_g_parm,
2161         .vidioc_s_parm          = vidioc_s_parm,
2162         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2163         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2164 #ifdef CONFIG_VIDEO_ADV_DEBUG
2165         .vidioc_g_register      = vidioc_g_register,
2166         .vidioc_s_register      = vidioc_s_register,
2167 #endif
2168         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2169 };
2170
2171 static struct video_device gspca_template = {
2172         .name = "gspca main driver",
2173         .fops = &dev_fops,
2174         .ioctl_ops = &dev_ioctl_ops,
2175         .release = gspca_release,
2176 };
2177
2178 /* initialize the controls */
2179 static void ctrls_init(struct gspca_dev *gspca_dev)
2180 {
2181         struct gspca_ctrl *ctrl;
2182         int i;
2183
2184         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2185              i < gspca_dev->sd_desc->nctrls;
2186              i++, ctrl++) {
2187                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2188                 ctrl->val = ctrl->def;
2189                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2190                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2191         }
2192 }
2193
2194 /*
2195  * probe and create a new gspca device
2196  *
2197  * This function must be called by the sub-driver when it is
2198  * called for probing a new device.
2199  */
2200 int gspca_dev_probe2(struct usb_interface *intf,
2201                 const struct usb_device_id *id,
2202                 const struct sd_desc *sd_desc,
2203                 int dev_size,
2204                 struct module *module)
2205 {
2206         struct gspca_dev *gspca_dev;
2207         struct usb_device *dev = interface_to_usbdev(intf);
2208         int ret;
2209
2210         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2211
2212         /* create the device */
2213         if (dev_size < sizeof *gspca_dev)
2214                 dev_size = sizeof *gspca_dev;
2215         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2216         if (!gspca_dev) {
2217                 err("couldn't kzalloc gspca struct");
2218                 return -ENOMEM;
2219         }
2220         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2221         if (!gspca_dev->usb_buf) {
2222                 err("out of memory");
2223                 ret = -ENOMEM;
2224                 goto out;
2225         }
2226         gspca_dev->dev = dev;
2227         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2228         gspca_dev->nbalt = intf->num_altsetting;
2229
2230         /* check if any audio device */
2231         if (dev->config->desc.bNumInterfaces != 1) {
2232                 int i;
2233                 struct usb_interface *intf2;
2234
2235                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2236                         intf2 = dev->config->interface[i];
2237                         if (intf2 != NULL
2238                          && intf2->altsetting != NULL
2239                          && intf2->altsetting->desc.bInterfaceClass ==
2240                                          USB_CLASS_AUDIO) {
2241                                 gspca_dev->audio = 1;
2242                                 break;
2243                         }
2244                 }
2245         }
2246
2247         gspca_dev->sd_desc = sd_desc;
2248         gspca_dev->nbufread = 2;
2249         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2250
2251         /* configure the subdriver and initialize the USB device */
2252         ret = sd_desc->config(gspca_dev, id);
2253         if (ret < 0)
2254                 goto out;
2255         if (gspca_dev->cam.ctrls != NULL)
2256                 ctrls_init(gspca_dev);
2257         ret = sd_desc->init(gspca_dev);
2258         if (ret < 0)
2259                 goto out;
2260         gspca_set_default_mode(gspca_dev);
2261
2262         ret = gspca_input_connect(gspca_dev);
2263         if (ret)
2264                 goto out;
2265
2266         mutex_init(&gspca_dev->usb_lock);
2267         mutex_init(&gspca_dev->read_lock);
2268         mutex_init(&gspca_dev->queue_lock);
2269         init_waitqueue_head(&gspca_dev->wq);
2270
2271         /* init video stuff */
2272         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2273         gspca_dev->vdev.parent = &intf->dev;
2274         gspca_dev->module = module;
2275         gspca_dev->present = 1;
2276         ret = video_register_device(&gspca_dev->vdev,
2277                                   VFL_TYPE_GRABBER,
2278                                   -1);
2279         if (ret < 0) {
2280                 err("video_register_device err %d", ret);
2281                 goto out;
2282         }
2283
2284         usb_set_intfdata(intf, gspca_dev);
2285         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2286
2287         gspca_input_create_urb(gspca_dev);
2288
2289         return 0;
2290 out:
2291 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2292         if (gspca_dev->input_dev)
2293                 input_unregister_device(gspca_dev->input_dev);
2294 #endif
2295         kfree(gspca_dev->usb_buf);
2296         kfree(gspca_dev);
2297         return ret;
2298 }
2299 EXPORT_SYMBOL(gspca_dev_probe2);
2300
2301 /* same function as the previous one, but check the interface */
2302 int gspca_dev_probe(struct usb_interface *intf,
2303                 const struct usb_device_id *id,
2304                 const struct sd_desc *sd_desc,
2305                 int dev_size,
2306                 struct module *module)
2307 {
2308         struct usb_device *dev = interface_to_usbdev(intf);
2309
2310         /* we don't handle multi-config cameras */
2311         if (dev->descriptor.bNumConfigurations != 1) {
2312                 err("%04x:%04x too many config",
2313                                 id->idVendor, id->idProduct);
2314                 return -ENODEV;
2315         }
2316
2317         /* the USB video interface must be the first one */
2318         if (dev->config->desc.bNumInterfaces != 1
2319          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2320                 return -ENODEV;
2321
2322         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2323 }
2324 EXPORT_SYMBOL(gspca_dev_probe);
2325
2326 /*
2327  * USB disconnection
2328  *
2329  * This function must be called by the sub-driver
2330  * when the device disconnects, after the specific resources are freed.
2331  */
2332 void gspca_disconnect(struct usb_interface *intf)
2333 {
2334         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2335 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2336         struct input_dev *input_dev;
2337 #endif
2338
2339         PDEBUG(D_PROBE, "%s disconnect",
2340                 video_device_node_name(&gspca_dev->vdev));
2341         mutex_lock(&gspca_dev->usb_lock);
2342         gspca_dev->present = 0;
2343
2344         if (gspca_dev->streaming) {
2345                 destroy_urbs(gspca_dev);
2346                 wake_up_interruptible(&gspca_dev->wq);
2347         }
2348
2349 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2350         gspca_input_destroy_urb(gspca_dev);
2351         input_dev = gspca_dev->input_dev;
2352         if (input_dev) {
2353                 gspca_dev->input_dev = NULL;
2354                 input_unregister_device(input_dev);
2355         }
2356 #endif
2357
2358         /* the device is freed at exit of this function */
2359         gspca_dev->dev = NULL;
2360         mutex_unlock(&gspca_dev->usb_lock);
2361
2362         usb_set_intfdata(intf, NULL);
2363
2364         /* release the device */
2365         /* (this will call gspca_release() immediatly or on last close) */
2366         video_unregister_device(&gspca_dev->vdev);
2367
2368 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2369 }
2370 EXPORT_SYMBOL(gspca_disconnect);
2371
2372 #ifdef CONFIG_PM
2373 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2374 {
2375         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2376
2377         if (!gspca_dev->streaming)
2378                 return 0;
2379         gspca_dev->frozen = 1;          /* avoid urb error messages */
2380         if (gspca_dev->sd_desc->stopN)
2381                 gspca_dev->sd_desc->stopN(gspca_dev);
2382         destroy_urbs(gspca_dev);
2383         gspca_input_destroy_urb(gspca_dev);
2384         gspca_set_alt0(gspca_dev);
2385         if (gspca_dev->sd_desc->stop0)
2386                 gspca_dev->sd_desc->stop0(gspca_dev);
2387         return 0;
2388 }
2389 EXPORT_SYMBOL(gspca_suspend);
2390
2391 int gspca_resume(struct usb_interface *intf)
2392 {
2393         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2394
2395         gspca_dev->frozen = 0;
2396         gspca_dev->sd_desc->init(gspca_dev);
2397         gspca_input_create_urb(gspca_dev);
2398         if (gspca_dev->streaming)
2399                 return gspca_init_transfer(gspca_dev);
2400         return 0;
2401 }
2402 EXPORT_SYMBOL(gspca_resume);
2403 #endif
2404 /* -- cam driver utility functions -- */
2405
2406 /* auto gain and exposure algorithm based on the knee algorithm described here:
2407    http://ytse.tricolour.net/docs/LowLightOptimization.html
2408
2409    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2410    where changed. */
2411 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2412         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2413 {
2414         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2415         const struct ctrl *gain_ctrl = NULL;
2416         const struct ctrl *exposure_ctrl = NULL;
2417         const struct ctrl *autogain_ctrl = NULL;
2418         int retval = 0;
2419
2420         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2421                 if (gspca_dev->ctrl_dis & (1 << i))
2422                         continue;
2423                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2424                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2425                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2426                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2427                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2428                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2429         }
2430         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2431                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2432                         "on cam without (auto)gain/exposure");
2433                 return 0;
2434         }
2435
2436         if (gain_ctrl->get(gspca_dev, &gain) ||
2437                         exposure_ctrl->get(gspca_dev, &exposure) ||
2438                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2439                 return 0;
2440
2441         orig_gain = gain;
2442         orig_exposure = exposure;
2443
2444         /* If we are of a multiple of deadzone, do multiple steps to reach the
2445            desired lumination fast (with the risc of a slight overshoot) */
2446         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2447
2448         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2449                 avg_lum, desired_avg_lum, steps);
2450
2451         for (i = 0; i < steps; i++) {
2452                 if (avg_lum > desired_avg_lum) {
2453                         if (gain > gain_knee)
2454                                 gain--;
2455                         else if (exposure > exposure_knee)
2456                                 exposure--;
2457                         else if (gain > gain_ctrl->qctrl.default_value)
2458                                 gain--;
2459                         else if (exposure > exposure_ctrl->qctrl.minimum)
2460                                 exposure--;
2461                         else if (gain > gain_ctrl->qctrl.minimum)
2462                                 gain--;
2463                         else
2464                                 break;
2465                 } else {
2466                         if (gain < gain_ctrl->qctrl.default_value)
2467                                 gain++;
2468                         else if (exposure < exposure_knee)
2469                                 exposure++;
2470                         else if (gain < gain_knee)
2471                                 gain++;
2472                         else if (exposure < exposure_ctrl->qctrl.maximum)
2473                                 exposure++;
2474                         else if (gain < gain_ctrl->qctrl.maximum)
2475                                 gain++;
2476                         else
2477                                 break;
2478                 }
2479         }
2480
2481         if (gain != orig_gain) {
2482                 gain_ctrl->set(gspca_dev, gain);
2483                 retval = 1;
2484         }
2485         if (exposure != orig_exposure) {
2486                 exposure_ctrl->set(gspca_dev, exposure);
2487                 retval = 1;
2488         }
2489
2490         return retval;
2491 }
2492 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2493
2494 /* -- module insert / remove -- */
2495 static int __init gspca_init(void)
2496 {
2497         info("v%d.%d.%d registered",
2498                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2499                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2500                 DRIVER_VERSION_NUMBER & 0xff);
2501         return 0;
2502 }
2503 static void __exit gspca_exit(void)
2504 {
2505 }
2506
2507 module_init(gspca_init);
2508 module_exit(gspca_exit);
2509
2510 #ifdef GSPCA_DEBUG
2511 module_param_named(debug, gspca_debug, int, 0644);
2512 MODULE_PARM_DESC(debug,
2513                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2514                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2515                 " 0x0100: v4l2");
2516 #endif