drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2011 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #define GSPCA_VERSION   "2.14.0"
  27
  28 #include <linux/init.h>
  29 #include <linux/fs.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/string.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/io.h>
  37 #include <asm/page.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/ktime.h>
  40 #include <media/v4l2-ioctl.h>
  41 #include <media/v4l2-ctrls.h>
  42 #include <media/v4l2-fh.h>
  43 #include <media/v4l2-event.h>
  44
  45 #include "gspca.h"
  46
  47 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  48 #include <linux/input.h>
  49 #include <linux/usb/input.h>
  50 #endif
  51
  52 /* global values */
  53 #define DEF_NURBS 3             /* default number of URBs */
  54 #if DEF_NURBS > MAX_NURBS
  55 #error "DEF_NURBS too big"
  56 #endif
  57
  58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  59 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  60 MODULE_LICENSE("GPL");
  61 MODULE_VERSION(GSPCA_VERSION);
  62
  63 #ifdef GSPCA_DEBUG
  64 int gspca_debug = D_ERR | D_PROBE;
  65 EXPORT_SYMBOL(gspca_debug);
  66
  67 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  68 {
  69         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  70                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  71                         txt,
  72                         pixfmt & 0xff,
  73                         (pixfmt >> 8) & 0xff,
  74                         (pixfmt >> 16) & 0xff,
  75                         pixfmt >> 24,
  76                         w, h);
  77         } else {
  78                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  79                         txt,
  80                         pixfmt,
  81                         w, h);
  82         }
  83 }
  84 #else
  85 #define PDEBUG_MODE(txt, pixfmt, w, h)
  86 #endif
  87
  88 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  89 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  90 #define GSPCA_MEMORY_READ 7
  91
  92 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  93
  94 /*
  95  * VMA operations.
  96  */
  97 static void gspca_vm_open(struct vm_area_struct *vma)
  98 {
  99         struct gspca_frame *frame = vma->vm_private_data;
 100
 101         frame->vma_use_count++;
 102         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 103 }
 104
 105 static void gspca_vm_close(struct vm_area_struct *vma)
 106 {
 107         struct gspca_frame *frame = vma->vm_private_data;
 108
 109         if (--frame->vma_use_count <= 0)
 110                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 111 }
 112
 113 static const struct vm_operations_struct gspca_vm_ops = {
 114         .open           = gspca_vm_open,
 115         .close          = gspca_vm_close,
 116 };
 117
 118 /*
 119  * Input and interrupt endpoint handling functions
 120  */
 121 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 122 static void int_irq(struct urb *urb)
 123 {
 124         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 125         int ret;
 126
 127         ret = urb->status;
 128         switch (ret) {
 129         case 0:
 130                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 131                     urb->transfer_buffer, urb->actual_length) < 0) {
 132                         PDEBUG(D_ERR, "Unknown packet received");
 133                 }
 134                 break;
 135
 136         case -ENOENT:
 137         case -ECONNRESET:
 138         case -ENODEV:
 139         case -ESHUTDOWN:
 140                 /* Stop is requested either by software or hardware is gone,
 141                  * keep the ret value non-zero and don't resubmit later.
 142                  */
 143                 break;
 144
 145         default:
 146                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 147                 urb->status = 0;
 148                 ret = 0;
 149         }
 150
 151         if (ret == 0) {
 152                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 153                 if (ret < 0)
 154                         pr_err("Resubmit URB failed with error %i\n", ret);
 155         }
 156 }
 157
 158 static int gspca_input_connect(struct gspca_dev *dev)
 159 {
 160         struct input_dev *input_dev;
 161         int err = 0;
 162
 163         dev->input_dev = NULL;
 164         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 165                 input_dev = input_allocate_device();
 166                 if (!input_dev)
 167                         return -ENOMEM;
 168
 169                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 170                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 171
 172                 input_dev->name = dev->sd_desc->name;
 173                 input_dev->phys = dev->phys;
 174
 175                 usb_to_input_id(dev->dev, &input_dev->id);
 176
 177                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 178                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 179                 input_dev->dev.parent = &dev->dev->dev;
 180
 181                 err = input_register_device(input_dev);
 182                 if (err) {
 183                         pr_err("Input device registration failed with error %i\n",
 184                                err);
 185                         input_dev->dev.parent = NULL;
 186                         input_free_device(input_dev);
 187                 } else {
 188                         dev->input_dev = input_dev;
 189                 }
 190         }
 191
 192         return err;
 193 }
 194
 195 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 196                           struct usb_endpoint_descriptor *ep)
 197 {
 198         unsigned int buffer_len;
 199         int interval;
 200         struct urb *urb;
 201         struct usb_device *dev;
 202         void *buffer = NULL;
 203         int ret = -EINVAL;
 204
 205         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 206         interval = ep->bInterval;
 207         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 208                 "buffer_len=%u, interval=%u",
 209                 ep->bEndpointAddress, buffer_len, interval);
 210
 211         dev = gspca_dev->dev;
 212
 213         urb = usb_alloc_urb(0, GFP_KERNEL);
 214         if (!urb) {
 215                 ret = -ENOMEM;
 216                 goto error;
 217         }
 218
 219         buffer = usb_alloc_coherent(dev, buffer_len,
 220                                 GFP_KERNEL, &urb->transfer_dma);
 221         if (!buffer) {
 222                 ret = -ENOMEM;
 223                 goto error_buffer;
 224         }
 225         usb_fill_int_urb(urb, dev,
 226                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 227                 buffer, buffer_len,
 228                 int_irq, (void *)gspca_dev, interval);
 229         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 230         ret = usb_submit_urb(urb, GFP_KERNEL);
 231         if (ret < 0) {
 232                 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
 233                 goto error_submit;
 234         }
 235         gspca_dev->int_urb = urb;
 236         return ret;
 237
 238 error_submit:
 239         usb_free_coherent(dev,
 240                           urb->transfer_buffer_length,
 241                           urb->transfer_buffer,
 242                           urb->transfer_dma);
 243 error_buffer:
 244         usb_free_urb(urb);
 245 error:
 246         return ret;
 247 }
 248
 249 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 250 {
 251         struct usb_interface *intf;
 252         struct usb_host_interface *intf_desc;
 253         struct usb_endpoint_descriptor *ep;
 254         int i;
 255
 256         if (gspca_dev->sd_desc->int_pkt_scan)  {
 257                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 258                 intf_desc = intf->cur_altsetting;
 259                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 260                         ep = &intf_desc->endpoint[i].desc;
 261                         if (usb_endpoint_dir_in(ep) &&
 262                             usb_endpoint_xfer_int(ep)) {
 263
 264                                 alloc_and_submit_int_urb(gspca_dev, ep);
 265                                 break;
 266                         }
 267                 }
 268         }
 269 }
 270
 271 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 272 {
 273         struct urb *urb;
 274
 275         urb = gspca_dev->int_urb;
 276         if (urb) {
 277                 gspca_dev->int_urb = NULL;
 278                 usb_kill_urb(urb);
 279                 usb_free_coherent(gspca_dev->dev,
 280                                   urb->transfer_buffer_length,
 281                                   urb->transfer_buffer,
 282                                   urb->transfer_dma);
 283                 usb_free_urb(urb);
 284         }
 285 }
 286 #else
 287 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 288 {
 289 }
 290
 291 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 292 {
 293 }
 294
 295 static inline int gspca_input_connect(struct gspca_dev *dev)
 296 {
 297         return 0;
 298 }
 299 #endif
 300
 301 /*
 302  * fill a video frame from an URB and resubmit
 303  */
 304 static void fill_frame(struct gspca_dev *gspca_dev,
 305                         struct urb *urb)
 306 {
 307         u8 *data;               /* address of data in the iso message */
 308         int i, len, st;
 309         cam_pkt_op pkt_scan;
 310
 311         if (urb->status != 0) {
 312                 if (urb->status == -ESHUTDOWN)
 313                         return;         /* disconnection */
 314 #ifdef CONFIG_PM
 315                 if (gspca_dev->frozen)
 316                         return;
 317 #endif
 318                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 319                 urb->status = 0;
 320                 goto resubmit;
 321         }
 322         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 323         for (i = 0; i < urb->number_of_packets; i++) {
 324                 len = urb->iso_frame_desc[i].actual_length;
 325
 326                 /* check the packet status and length */
 327                 st = urb->iso_frame_desc[i].status;
 328                 if (st) {
 329                         pr_err("ISOC data error: [%d] len=%d, status=%d\n",
 330                                i, len, st);
 331                         gspca_dev->last_packet_type = DISCARD_PACKET;
 332                         continue;
 333                 }
 334                 if (len == 0) {
 335                         if (gspca_dev->empty_packet == 0)
 336                                 gspca_dev->empty_packet = 1;
 337                         continue;
 338                 }
 339
 340                 /* let the packet be analyzed by the subdriver */
 341                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 342                         i, urb->iso_frame_desc[i].offset, len);
 343                 data = (u8 *) urb->transfer_buffer
 344                                         + urb->iso_frame_desc[i].offset;
 345                 pkt_scan(gspca_dev, data, len);
 346         }
 347
 348 resubmit:
 349         /* resubmit the URB */
 350         st = usb_submit_urb(urb, GFP_ATOMIC);
 351         if (st < 0)
 352                 pr_err("usb_submit_urb() ret %d\n", st);
 353 }
 354
 355 /*
 356  * ISOC message interrupt from the USB device
 357  *
 358  * Analyse each packet and call the subdriver for copy to the frame buffer.
 359  */
 360 static void isoc_irq(struct urb *urb)
 361 {
 362         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 363
 364         PDEBUG(D_PACK, "isoc irq");
 365         if (!gspca_dev->streaming)
 366                 return;
 367         fill_frame(gspca_dev, urb);
 368 }
 369
 370 /*
 371  * bulk message interrupt from the USB device
 372  */
 373 static void bulk_irq(struct urb *urb)
 374 {
 375         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 376         int st;
 377
 378         PDEBUG(D_PACK, "bulk irq");
 379         if (!gspca_dev->streaming)
 380                 return;
 381         switch (urb->status) {
 382         case 0:
 383                 break;
 384         case -ESHUTDOWN:
 385                 return;         /* disconnection */
 386         default:
 387 #ifdef CONFIG_PM
 388                 if (gspca_dev->frozen)
 389                         return;
 390 #endif
 391                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 392                 urb->status = 0;
 393                 goto resubmit;
 394         }
 395
 396         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 397         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 398                                 urb->transfer_buffer,
 399                                 urb->actual_length);
 400
 401 resubmit:
 402         /* resubmit the URB */
 403         if (gspca_dev->cam.bulk_nurbs != 0) {
 404                 st = usb_submit_urb(urb, GFP_ATOMIC);
 405                 if (st < 0)
 406                         pr_err("usb_submit_urb() ret %d\n", st);
 407         }
 408 }
 409
 410 /*
 411  * add data to the current frame
 412  *
 413  * This function is called by the subdrivers at interrupt level.
 414  *
 415  * To build a frame, these ones must add
 416  *      - one FIRST_PACKET
 417  *      - 0 or many INTER_PACKETs
 418  *      - one LAST_PACKET
 419  * DISCARD_PACKET invalidates the whole frame.
 420  */
 421 void gspca_frame_add(struct gspca_dev *gspca_dev,
 422                         enum gspca_packet_type packet_type,
 423                         const u8 *data,
 424                         int len)
 425 {
 426         struct gspca_frame *frame;
 427         int i, j;
 428
 429         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 430
 431         if (packet_type == FIRST_PACKET) {
 432                 i = atomic_read(&gspca_dev->fr_i);
 433
 434                 /* if there are no queued buffer, discard the whole frame */
 435                 if (i == atomic_read(&gspca_dev->fr_q)) {
 436                         gspca_dev->last_packet_type = DISCARD_PACKET;
 437                         gspca_dev->sequence++;
 438                         return;
 439                 }
 440                 j = gspca_dev->fr_queue[i];
 441                 frame = &gspca_dev->frame[j];
 442                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 443                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 444                 gspca_dev->image = frame->data;
 445                 gspca_dev->image_len = 0;
 446         } else {
 447                 switch (gspca_dev->last_packet_type) {
 448                 case DISCARD_PACKET:
 449                         if (packet_type == LAST_PACKET) {
 450                                 gspca_dev->last_packet_type = packet_type;
 451                                 gspca_dev->image = NULL;
 452                                 gspca_dev->image_len = 0;
 453                         }
 454                         return;
 455                 case LAST_PACKET:
 456                         return;
 457                 }
 458         }
 459
 460         /* append the packet to the frame buffer */
 461         if (len > 0) {
 462                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 463                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 464                                 gspca_dev->image_len + len,
 465                                 gspca_dev->frsz);
 466                         packet_type = DISCARD_PACKET;
 467                 } else {
 468 /* !! image is NULL only when last pkt is LAST or DISCARD
 469                         if (gspca_dev->image == NULL) {
 470                                 pr_err("gspca_frame_add() image == NULL\n");
 471                                 return;
 472                         }
 473  */
 474                         memcpy(gspca_dev->image + gspca_dev->image_len,
 475                                 data, len);
 476                         gspca_dev->image_len += len;
 477                 }
 478         }
 479         gspca_dev->last_packet_type = packet_type;
 480
 481         /* if last packet, invalidate packet concatenation until
 482          * next first packet, wake up the application and advance
 483          * in the queue */
 484         if (packet_type == LAST_PACKET) {
 485                 i = atomic_read(&gspca_dev->fr_i);
 486                 j = gspca_dev->fr_queue[i];
 487                 frame = &gspca_dev->frame[j];
 488                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 489                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 490                                          | V4L2_BUF_FLAG_DONE)
 491                                         & ~V4L2_BUF_FLAG_QUEUED;
 492                 i = (i + 1) % GSPCA_MAX_FRAMES;
 493                 atomic_set(&gspca_dev->fr_i, i);
 494                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 495                 PDEBUG(D_FRAM, "frame complete len:%d",
 496                         frame->v4l2_buf.bytesused);
 497                 gspca_dev->image = NULL;
 498                 gspca_dev->image_len = 0;
 499         }
 500 }
 501 EXPORT_SYMBOL(gspca_frame_add);
 502
 503 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 504                         enum v4l2_memory memory, unsigned int count)
 505 {
 506         struct gspca_frame *frame;
 507         unsigned int frsz;
 508         int i;
 509
 510         i = gspca_dev->curr_mode;
 511         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 512         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 513         frsz = PAGE_ALIGN(frsz);
 514         if (count >= GSPCA_MAX_FRAMES)
 515                 count = GSPCA_MAX_FRAMES - 1;
 516         gspca_dev->frbuf = vmalloc_32(frsz * count);
 517         if (!gspca_dev->frbuf) {
 518                 pr_err("frame alloc failed\n");
 519                 return -ENOMEM;
 520         }
 521         gspca_dev->capt_file = file;
 522         gspca_dev->memory = memory;
 523         gspca_dev->frsz = frsz;
 524         gspca_dev->nframes = count;
 525         for (i = 0; i < count; i++) {
 526                 frame = &gspca_dev->frame[i];
 527                 frame->v4l2_buf.index = i;
 528                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 529                 frame->v4l2_buf.flags = 0;
 530                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 531                 frame->v4l2_buf.length = frsz;
 532                 frame->v4l2_buf.memory = memory;
 533                 frame->v4l2_buf.sequence = 0;
 534                 frame->data = gspca_dev->frbuf + i * frsz;
 535                 frame->v4l2_buf.m.offset = i * frsz;
 536         }
 537         atomic_set(&gspca_dev->fr_q, 0);
 538         atomic_set(&gspca_dev->fr_i, 0);
 539         gspca_dev->fr_o = 0;
 540         return 0;
 541 }
 542
 543 static void frame_free(struct gspca_dev *gspca_dev)
 544 {
 545         int i;
 546
 547         PDEBUG(D_STREAM, "frame free");
 548         if (gspca_dev->frbuf != NULL) {
 549                 vfree(gspca_dev->frbuf);
 550                 gspca_dev->frbuf = NULL;
 551                 for (i = 0; i < gspca_dev->nframes; i++)
 552                         gspca_dev->frame[i].data = NULL;
 553         }
 554         gspca_dev->nframes = 0;
 555         gspca_dev->frsz = 0;
 556         gspca_dev->capt_file = NULL;
 557         gspca_dev->memory = GSPCA_MEMORY_NO;
 558 }
 559
 560 static void destroy_urbs(struct gspca_dev *gspca_dev)
 561 {
 562         struct urb *urb;
 563         unsigned int i;
 564
 565         PDEBUG(D_STREAM, "kill transfer");
 566         for (i = 0; i < MAX_NURBS; i++) {
 567                 urb = gspca_dev->urb[i];
 568                 if (urb == NULL)
 569                         break;
 570
 571                 gspca_dev->urb[i] = NULL;
 572                 usb_kill_urb(urb);
 573                 if (urb->transfer_buffer != NULL)
 574                         usb_free_coherent(gspca_dev->dev,
 575                                           urb->transfer_buffer_length,
 576                                           urb->transfer_buffer,
 577                                           urb->transfer_dma);
 578                 usb_free_urb(urb);
 579         }
 580 }
 581
 582 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 583 {
 584         int ret;
 585
 586         if (gspca_dev->alt == 0)
 587                 return 0;
 588         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 589         if (ret < 0)
 590                 pr_err("set alt 0 err %d\n", ret);
 591         return ret;
 592 }
 593
 594 /* Note: both the queue and the usb locks should be held when calling this */
 595 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 596 {
 597         gspca_dev->streaming = 0;
 598         gspca_dev->usb_err = 0;
 599         if (gspca_dev->sd_desc->stopN)
 600                 gspca_dev->sd_desc->stopN(gspca_dev);
 601         destroy_urbs(gspca_dev);
 602         gspca_input_destroy_urb(gspca_dev);
 603         gspca_set_alt0(gspca_dev);
 604         gspca_input_create_urb(gspca_dev);
 605         if (gspca_dev->sd_desc->stop0)
 606                 gspca_dev->sd_desc->stop0(gspca_dev);
 607         PDEBUG(D_STREAM, "stream off OK");
 608 }
 609
 610 /*
 611  * look for an input transfer endpoint in an alternate setting
 612  */
 613 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 614                                           int xfer)
 615 {
 616         struct usb_host_endpoint *ep;
 617         int i, attr;
 618
 619         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 620                 ep = &alt->endpoint[i];
 621                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 622                 if (attr == xfer
 623                     && ep->desc.wMaxPacketSize != 0
 624                     && usb_endpoint_dir_in(&ep->desc))
 625                         return ep;
 626         }
 627         return NULL;
 628 }
 629
 630 /* compute the minimum bandwidth for the current transfer */
 631 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 632 {
 633         u32 bandwidth;
 634         int i;
 635
 636         /* get the (max) image size */
 637         i = gspca_dev->curr_mode;
 638         bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
 639
 640         /* if the image is compressed, estimate its mean size */
 641         if (!gspca_dev->cam.needs_full_bandwidth &&
 642             bandwidth < gspca_dev->cam.cam_mode[i].width *
 643                                 gspca_dev->cam.cam_mode[i].height)
 644                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 645
 646         /* estimate the frame rate */
 647         if (gspca_dev->sd_desc->get_streamparm) {
 648                 struct v4l2_streamparm parm;
 649
 650                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 651                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 652                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 653         } else {
 654
 655                 /* don't hope more than 15 fps with USB 1.1 and
 656                  * image resolution >= 640x480 */
 657                 if (gspca_dev->width >= 640
 658                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 659                         bandwidth *= 15;                /* 15 fps */
 660                 else
 661                         bandwidth *= 30;                /* 30 fps */
 662         }
 663
 664         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 665         return bandwidth;
 666 }
 667
 668 /* endpoint table */
 669 #define MAX_ALT 16
 670 struct ep_tb_s {
 671         u32 alt;
 672         u32 bandwidth;
 673 };
 674
 675 /*
 676  * build the table of the endpoints
 677  * and compute the minimum bandwidth for the image transfer
 678  */
 679 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 680                         struct usb_interface *intf,
 681                         struct ep_tb_s *ep_tb)
 682 {
 683         struct usb_host_endpoint *ep;
 684         int i, j, nbalt, psize, found;
 685         u32 bandwidth, last_bw;
 686
 687         nbalt = intf->num_altsetting;
 688         if (nbalt > MAX_ALT)
 689                 nbalt = MAX_ALT;        /* fixme: should warn */
 690
 691         /* build the endpoint table */
 692         i = 0;
 693         last_bw = 0;
 694         for (;;) {
 695                 ep_tb->bandwidth = 2000 * 2000 * 120;
 696                 found = 0;
 697                 for (j = 0; j < nbalt; j++) {
 698                         ep = alt_xfer(&intf->altsetting[j],
 699                                       USB_ENDPOINT_XFER_ISOC);
 700                         if (ep == NULL)
 701                                 continue;
 702                         if (ep->desc.bInterval == 0) {
 703                                 pr_err("alt %d iso endp with 0 interval\n", j);
 704                                 continue;
 705                         }
 706                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 707                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 708                         bandwidth = psize * 1000;
 709                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 710                          || gspca_dev->dev->speed == USB_SPEED_SUPER)
 711                                 bandwidth *= 8;
 712                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 713                         if (bandwidth <= last_bw)
 714                                 continue;
 715                         if (bandwidth < ep_tb->bandwidth) {
 716                                 ep_tb->bandwidth = bandwidth;
 717                                 ep_tb->alt = j;
 718                                 found = 1;
 719                         }
 720                 }
 721                 if (!found)
 722                         break;
 723                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 724                                 ep_tb->alt, ep_tb->bandwidth);
 725                 last_bw = ep_tb->bandwidth;
 726                 i++;
 727                 ep_tb++;
 728         }
 729
 730         /*
 731          * If the camera:
 732          * has a usb audio class interface (a built in usb mic); and
 733          * is a usb 1 full speed device; and
 734          * uses the max full speed iso bandwidth; and
 735          * and has more than 1 alt setting
 736          * then skip the highest alt setting to spare bandwidth for the mic
 737          */
 738         if (gspca_dev->audio &&
 739                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 740                         last_bw >= 1000000 &&
 741                         i > 1) {
 742                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 743                 i--;
 744                 ep_tb--;
 745         }
 746
 747         /* get the requested bandwidth and start at the highest atlsetting */
 748         bandwidth = which_bandwidth(gspca_dev);
 749         ep_tb--;
 750         while (i > 1) {
 751                 ep_tb--;
 752                 if (ep_tb->bandwidth < bandwidth)
 753                         break;
 754                 i--;
 755         }
 756         return i;
 757 }
 758
 759 /*
 760  * create the URBs for image transfer
 761  */
 762 static int create_urbs(struct gspca_dev *gspca_dev,
 763                         struct usb_host_endpoint *ep)
 764 {
 765         struct urb *urb;
 766         int n, nurbs, i, psize, npkt, bsize;
 767
 768         /* calculate the packet size and the number of packets */
 769         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 770
 771         if (!gspca_dev->cam.bulk) {             /* isoc */
 772
 773                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 774                 if (gspca_dev->pkt_size == 0)
 775                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 776                 else
 777                         psize = gspca_dev->pkt_size;
 778                 npkt = gspca_dev->cam.npkt;
 779                 if (npkt == 0)
 780                         npkt = 32;              /* default value */
 781                 bsize = psize * npkt;
 782                 PDEBUG(D_STREAM,
 783                         "isoc %d pkts size %d = bsize:%d",
 784                         npkt, psize, bsize);
 785                 nurbs = DEF_NURBS;
 786         } else {                                /* bulk */
 787                 npkt = 0;
 788                 bsize = gspca_dev->cam.bulk_size;
 789                 if (bsize == 0)
 790                         bsize = psize;
 791                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 792                 if (gspca_dev->cam.bulk_nurbs != 0)
 793                         nurbs = gspca_dev->cam.bulk_nurbs;
 794                 else
 795                         nurbs = 1;
 796         }
 797
 798         for (n = 0; n < nurbs; n++) {
 799                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 800                 if (!urb) {
 801                         pr_err("usb_alloc_urb failed\n");
 802                         return -ENOMEM;
 803                 }
 804                 gspca_dev->urb[n] = urb;
 805                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 806                                                 bsize,
 807                                                 GFP_KERNEL,
 808                                                 &urb->transfer_dma);
 809
 810                 if (urb->transfer_buffer == NULL) {
 811                         pr_err("usb_alloc_coherent failed\n");
 812                         return -ENOMEM;
 813                 }
 814                 urb->dev = gspca_dev->dev;
 815                 urb->context = gspca_dev;
 816                 urb->transfer_buffer_length = bsize;
 817                 if (npkt != 0) {                /* ISOC */
 818                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 819                                                     ep->desc.bEndpointAddress);
 820                         urb->transfer_flags = URB_ISO_ASAP
 821                                         | URB_NO_TRANSFER_DMA_MAP;
 822                         urb->interval = 1 << (ep->desc.bInterval - 1);
 823                         urb->complete = isoc_irq;
 824                         urb->number_of_packets = npkt;
 825                         for (i = 0; i < npkt; i++) {
 826                                 urb->iso_frame_desc[i].length = psize;
 827                                 urb->iso_frame_desc[i].offset = psize * i;
 828                         }
 829                 } else {                /* bulk */
 830                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 831                                                 ep->desc.bEndpointAddress);
 832                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 833                         urb->complete = bulk_irq;
 834                 }
 835         }
 836         return 0;
 837 }
 838
 839 /*
 840  * start the USB transfer
 841  */
 842 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 843 {
 844         struct usb_interface *intf;
 845         struct usb_host_endpoint *ep;
 846         struct urb *urb;
 847         struct ep_tb_s ep_tb[MAX_ALT];
 848         int n, ret, xfer, alt, alt_idx;
 849
 850         /* reset the streaming variables */
 851         gspca_dev->image = NULL;
 852         gspca_dev->image_len = 0;
 853         gspca_dev->last_packet_type = DISCARD_PACKET;
 854         gspca_dev->sequence = 0;
 855
 856         gspca_dev->usb_err = 0;
 857
 858         /* do the specific subdriver stuff before endpoint selection */
 859         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 860         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 861         if (gspca_dev->sd_desc->isoc_init) {
 862                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 863                 if (ret < 0)
 864                         return ret;
 865         }
 866         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 867                                    : USB_ENDPOINT_XFER_ISOC;
 868
 869         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 870         if (gspca_dev->alt != 0) {
 871                 gspca_dev->alt--;       /* (previous version compatibility) */
 872                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
 873                 if (ep == NULL) {
 874                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 875                         return -EIO;
 876                 }
 877                 ep_tb[0].alt = gspca_dev->alt;
 878                 alt_idx = 1;
 879         } else {
 880
 881         /* else, compute the minimum bandwidth
 882          * and build the endpoint table */
 883                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 884                 if (alt_idx <= 0) {
 885                         pr_err("no transfer endpoint found\n");
 886                         return -EIO;
 887                 }
 888         }
 889
 890         /* set the highest alternate setting and
 891          * loop until urb submit succeeds */
 892         gspca_input_destroy_urb(gspca_dev);
 893
 894         gspca_dev->alt = ep_tb[--alt_idx].alt;
 895         alt = -1;
 896         for (;;) {
 897                 if (alt != gspca_dev->alt) {
 898                         alt = gspca_dev->alt;
 899                         if (intf->num_altsetting > 1) {
 900                                 ret = usb_set_interface(gspca_dev->dev,
 901                                                         gspca_dev->iface,
 902                                                         alt);
 903                                 if (ret < 0) {
 904                                         if (ret == -ENOSPC)
 905                                                 goto retry; /*fixme: ugly*/
 906                                         pr_err("set alt %d err %d\n", alt, ret);
 907                                         goto out;
 908                                 }
 909                         }
 910                 }
 911                 if (!gspca_dev->cam.no_urb_create) {
 912                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 913                         ret = create_urbs(gspca_dev,
 914                                 alt_xfer(&intf->altsetting[alt], xfer));
 915                         if (ret < 0) {
 916                                 destroy_urbs(gspca_dev);
 917                                 goto out;
 918                         }
 919                 }
 920
 921                 /* clear the bulk endpoint */
 922                 if (gspca_dev->cam.bulk)
 923                         usb_clear_halt(gspca_dev->dev,
 924                                         gspca_dev->urb[0]->pipe);
 925
 926                 /* start the cam */
 927                 ret = gspca_dev->sd_desc->start(gspca_dev);
 928                 if (ret < 0) {
 929                         destroy_urbs(gspca_dev);
 930                         goto out;
 931                 }
 932                 gspca_dev->streaming = 1;
 933
 934                 /* some bulk transfers are started by the subdriver */
 935                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 936                         break;
 937
 938                 /* submit the URBs */
 939                 for (n = 0; n < MAX_NURBS; n++) {
 940                         urb = gspca_dev->urb[n];
 941                         if (urb == NULL)
 942                                 break;
 943                         ret = usb_submit_urb(urb, GFP_KERNEL);
 944                         if (ret < 0)
 945                                 break;
 946                 }
 947                 if (ret >= 0)
 948                         break;                  /* transfer is started */
 949
 950                 /* something when wrong
 951                  * stop the webcam and free the transfer resources */
 952                 gspca_stream_off(gspca_dev);
 953                 if (ret != -ENOSPC) {
 954                         pr_err("usb_submit_urb alt %d err %d\n",
 955                                gspca_dev->alt, ret);
 956                         goto out;
 957                 }
 958
 959                 /* the bandwidth is not wide enough
 960                  * negotiate or try a lower alternate setting */
 961 retry:
 962                 PDEBUG(D_ERR|D_STREAM,
 963                         "alt %d - bandwidth not wide enough - trying again",
 964                         alt);
 965                 msleep(20);     /* wait for kill complete */
 966                 if (gspca_dev->sd_desc->isoc_nego) {
 967                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 968                         if (ret < 0)
 969                                 goto out;
 970                 } else {
 971                         if (alt_idx <= 0) {
 972                                 pr_err("no transfer endpoint found\n");
 973                                 ret = -EIO;
 974                                 goto out;
 975                         }
 976                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 977                 }
 978         }
 979 out:
 980         gspca_input_create_urb(gspca_dev);
 981         return ret;
 982 }
 983
 984 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 985 {
 986         struct gspca_ctrl *ctrl;
 987         int i;
 988
 989         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 990         gspca_dev->curr_mode = i;
 991         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 992         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 993         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 994
 995         /* set the current control values to their default values
 996          * which may have changed in sd_init() */
 997         /* does nothing if ctrl_handler == NULL */
 998         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 999         ctrl = gspca_dev->cam.ctrls;
1000         if (ctrl != NULL) {
1001                 for (i = 0;
1002                      i < gspca_dev->sd_desc->nctrls;
1003                      i++, ctrl++)
1004                         ctrl->val = ctrl->def;
1005         }
1006 }
1007
1008 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1009                         int width, int height)
1010 {
1011         int i;
1012
1013         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1014                 if (width >= gspca_dev->cam.cam_mode[i].width
1015                     && height >= gspca_dev->cam.cam_mode[i].height)
1016                         break;
1017         }
1018         return i;
1019 }
1020
1021 /*
1022  * search a mode with the right pixel format
1023  */
1024 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1025                         int mode,
1026                         int pixfmt)
1027 {
1028         int modeU, modeD;
1029
1030         modeU = modeD = mode;
1031         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1032                 if (--modeD >= 0) {
1033                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1034                                                                 == pixfmt)
1035                                 return modeD;
1036                 }
1037                 if (++modeU < gspca_dev->cam.nmodes) {
1038                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1039                                                                 == pixfmt)
1040                                 return modeU;
1041                 }
1042         }
1043         return -EINVAL;
1044 }
1045
1046 #ifdef CONFIG_VIDEO_ADV_DEBUG
1047 static int vidioc_g_register(struct file *file, void *priv,
1048                         struct v4l2_dbg_register *reg)
1049 {
1050         struct gspca_dev *gspca_dev = video_drvdata(file);
1051
1052         if (!gspca_dev->sd_desc->get_chip_ident)
1053                 return -ENOTTY;
1054
1055         if (!gspca_dev->sd_desc->get_register)
1056                 return -ENOTTY;
1057
1058         gspca_dev->usb_err = 0;
1059         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1060 }
1061
1062 static int vidioc_s_register(struct file *file, void *priv,
1063                         struct v4l2_dbg_register *reg)
1064 {
1065         struct gspca_dev *gspca_dev = video_drvdata(file);
1066
1067         if (!gspca_dev->sd_desc->get_chip_ident)
1068                 return -ENOTTY;
1069
1070         if (!gspca_dev->sd_desc->set_register)
1071                 return -ENOTTY;
1072
1073         gspca_dev->usb_err = 0;
1074         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1075 }
1076 #endif
1077
1078 static int vidioc_g_chip_ident(struct file *file, void *priv,
1079                         struct v4l2_dbg_chip_ident *chip)
1080 {
1081         struct gspca_dev *gspca_dev = video_drvdata(file);
1082
1083         if (!gspca_dev->sd_desc->get_chip_ident)
1084                 return -ENOTTY;
1085
1086         gspca_dev->usb_err = 0;
1087         return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1088 }
1089
1090 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1091                                 struct v4l2_fmtdesc *fmtdesc)
1092 {
1093         struct gspca_dev *gspca_dev = video_drvdata(file);
1094         int i, j, index;
1095         __u32 fmt_tb[8];
1096
1097         /* give an index to each format */
1098         index = 0;
1099         j = 0;
1100         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1101                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1102                 j = 0;
1103                 for (;;) {
1104                         if (fmt_tb[j] == fmt_tb[index])
1105                                 break;
1106                         j++;
1107                 }
1108                 if (j == index) {
1109                         if (fmtdesc->index == index)
1110                                 break;          /* new format */
1111                         index++;
1112                         if (index >= ARRAY_SIZE(fmt_tb))
1113                                 return -EINVAL;
1114                 }
1115         }
1116         if (i < 0)
1117                 return -EINVAL;         /* no more format */
1118
1119         fmtdesc->pixelformat = fmt_tb[index];
1120         if (gspca_dev->cam.cam_mode[i].sizeimage <
1121                         gspca_dev->cam.cam_mode[i].width *
1122                                 gspca_dev->cam.cam_mode[i].height)
1123                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1124         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1125         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1126         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1127         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1128         fmtdesc->description[4] = '\0';
1129         return 0;
1130 }
1131
1132 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1133                             struct v4l2_format *fmt)
1134 {
1135         struct gspca_dev *gspca_dev = video_drvdata(file);
1136         int mode;
1137
1138         mode = gspca_dev->curr_mode;
1139         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1140                 sizeof fmt->fmt.pix);
1141         return 0;
1142 }
1143
1144 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1145                         struct v4l2_format *fmt)
1146 {
1147         int w, h, mode, mode2;
1148
1149         w = fmt->fmt.pix.width;
1150         h = fmt->fmt.pix.height;
1151
1152 #ifdef GSPCA_DEBUG
1153         if (gspca_debug & D_CONF)
1154                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1155 #endif
1156         /* search the closest mode for width and height */
1157         mode = wxh_to_mode(gspca_dev, w, h);
1158
1159         /* OK if right palette */
1160         if (gspca_dev->cam.cam_mode[mode].pixelformat
1161                                                 != fmt->fmt.pix.pixelformat) {
1162
1163                 /* else, search the closest mode with the same pixel format */
1164                 mode2 = gspca_get_mode(gspca_dev, mode,
1165                                         fmt->fmt.pix.pixelformat);
1166                 if (mode2 >= 0)
1167                         mode = mode2;
1168 /*              else
1169                         ;                * no chance, return this mode */
1170         }
1171         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1172                 sizeof fmt->fmt.pix);
1173         return mode;                    /* used when s_fmt */
1174 }
1175
1176 static int vidioc_try_fmt_vid_cap(struct file *file,
1177                               void *priv,
1178                               struct v4l2_format *fmt)
1179 {
1180         struct gspca_dev *gspca_dev = video_drvdata(file);
1181         int ret;
1182
1183         ret = try_fmt_vid_cap(gspca_dev, fmt);
1184         if (ret < 0)
1185                 return ret;
1186         return 0;
1187 }
1188
1189 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1190                             struct v4l2_format *fmt)
1191 {
1192         struct gspca_dev *gspca_dev = video_drvdata(file);
1193         int ret;
1194
1195         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1196                 return -ERESTARTSYS;
1197
1198         ret = try_fmt_vid_cap(gspca_dev, fmt);
1199         if (ret < 0)
1200                 goto out;
1201
1202         if (gspca_dev->nframes != 0
1203             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1204                 ret = -EINVAL;
1205                 goto out;
1206         }
1207
1208         if (ret == gspca_dev->curr_mode) {
1209                 ret = 0;
1210                 goto out;                       /* same mode */
1211         }
1212
1213         if (gspca_dev->streaming) {
1214                 ret = -EBUSY;
1215                 goto out;
1216         }
1217         gspca_dev->width = fmt->fmt.pix.width;
1218         gspca_dev->height = fmt->fmt.pix.height;
1219         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1220         gspca_dev->curr_mode = ret;
1221
1222         ret = 0;
1223 out:
1224         mutex_unlock(&gspca_dev->queue_lock);
1225         return ret;
1226 }
1227
1228 static int vidioc_enum_framesizes(struct file *file, void *priv,
1229                                   struct v4l2_frmsizeenum *fsize)
1230 {
1231         struct gspca_dev *gspca_dev = video_drvdata(file);
1232         int i;
1233         __u32 index = 0;
1234
1235         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1236                 if (fsize->pixel_format !=
1237                                 gspca_dev->cam.cam_mode[i].pixelformat)
1238                         continue;
1239
1240                 if (fsize->index == index) {
1241                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1242                         fsize->discrete.width =
1243                                 gspca_dev->cam.cam_mode[i].width;
1244                         fsize->discrete.height =
1245                                 gspca_dev->cam.cam_mode[i].height;
1246                         return 0;
1247                 }
1248                 index++;
1249         }
1250
1251         return -EINVAL;
1252 }
1253
1254 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1255                                       struct v4l2_frmivalenum *fival)
1256 {
1257         struct gspca_dev *gspca_dev = video_drvdata(filp);
1258         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1259         __u32 i;
1260
1261         if (gspca_dev->cam.mode_framerates == NULL ||
1262                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1263                 return -EINVAL;
1264
1265         if (fival->pixel_format !=
1266                         gspca_dev->cam.cam_mode[mode].pixelformat)
1267                 return -EINVAL;
1268
1269         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1270                 if (fival->index == i) {
1271                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1272                         fival->discrete.numerator = 1;
1273                         fival->discrete.denominator =
1274                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1275                         return 0;
1276                 }
1277         }
1278
1279         return -EINVAL;
1280 }
1281
1282 static void gspca_release(struct v4l2_device *v4l2_device)
1283 {
1284         struct gspca_dev *gspca_dev =
1285                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1286
1287         PDEBUG(D_PROBE, "%s released",
1288                 video_device_node_name(&gspca_dev->vdev));
1289
1290         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1291         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1292         kfree(gspca_dev->usb_buf);
1293         kfree(gspca_dev);
1294 }
1295
1296 static int dev_open(struct file *file)
1297 {
1298         struct gspca_dev *gspca_dev = video_drvdata(file);
1299
1300         PDEBUG(D_STREAM, "[%s] open", current->comm);
1301
1302         /* protect the subdriver against rmmod */
1303         if (!try_module_get(gspca_dev->module))
1304                 return -ENODEV;
1305
1306 #ifdef GSPCA_DEBUG
1307         /* activate the v4l2 debug */
1308         if (gspca_debug & D_V4L2)
1309                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1310                                         | V4L2_DEBUG_IOCTL_ARG;
1311         else
1312                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1313                                         | V4L2_DEBUG_IOCTL_ARG);
1314 #endif
1315         return v4l2_fh_open(file);
1316 }
1317
1318 static int dev_close(struct file *file)
1319 {
1320         struct gspca_dev *gspca_dev = video_drvdata(file);
1321
1322         PDEBUG(D_STREAM, "[%s] close", current->comm);
1323
1324         /* Needed for gspca_stream_off, always lock before queue_lock! */
1325         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1326                 return -ERESTARTSYS;
1327
1328         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1329                 mutex_unlock(&gspca_dev->usb_lock);
1330                 return -ERESTARTSYS;
1331         }
1332
1333         /* if the file did the capture, free the streaming resources */
1334         if (gspca_dev->capt_file == file) {
1335                 if (gspca_dev->streaming)
1336                         gspca_stream_off(gspca_dev);
1337                 frame_free(gspca_dev);
1338         }
1339         module_put(gspca_dev->module);
1340         mutex_unlock(&gspca_dev->queue_lock);
1341         mutex_unlock(&gspca_dev->usb_lock);
1342
1343         PDEBUG(D_STREAM, "close done");
1344
1345         return v4l2_fh_release(file);
1346 }
1347
1348 static int vidioc_querycap(struct file *file, void  *priv,
1349                            struct v4l2_capability *cap)
1350 {
1351         struct gspca_dev *gspca_dev = video_drvdata(file);
1352
1353         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1354                         sizeof cap->driver);
1355         if (gspca_dev->dev->product != NULL) {
1356                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1357                         sizeof cap->card);
1358         } else {
1359                 snprintf((char *) cap->card, sizeof cap->card,
1360                         "USB Camera (%04x:%04x)",
1361                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1362                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1363         }
1364         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1365                         sizeof(cap->bus_info));
1366         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1367                           | V4L2_CAP_STREAMING
1368                           | V4L2_CAP_READWRITE;
1369         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1370         return 0;
1371 }
1372
1373 static int get_ctrl(struct gspca_dev *gspca_dev,
1374                                    int id)
1375 {
1376         const struct ctrl *ctrls;
1377         int i;
1378
1379         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1380              i < gspca_dev->sd_desc->nctrls;
1381              i++, ctrls++) {
1382                 if (gspca_dev->ctrl_dis & (1 << i))
1383                         continue;
1384                 if (id == ctrls->qctrl.id)
1385                         return i;
1386         }
1387         return -1;
1388 }
1389
1390 static int vidioc_queryctrl(struct file *file, void *priv,
1391                            struct v4l2_queryctrl *q_ctrl)
1392 {
1393         struct gspca_dev *gspca_dev = video_drvdata(file);
1394         const struct ctrl *ctrls;
1395         struct gspca_ctrl *gspca_ctrl;
1396         int i, idx;
1397         u32 id;
1398
1399         id = q_ctrl->id;
1400         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1401                 id &= V4L2_CTRL_ID_MASK;
1402                 id++;
1403                 idx = -1;
1404                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1405                         if (gspca_dev->ctrl_dis & (1 << i))
1406                                 continue;
1407                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1408                                 continue;
1409                         if (idx >= 0
1410                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1411                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1412                                 continue;
1413                         idx = i;
1414                 }
1415         } else {
1416                 idx = get_ctrl(gspca_dev, id);
1417         }
1418         if (idx < 0)
1419                 return -EINVAL;
1420         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1421         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1422         if (gspca_dev->cam.ctrls != NULL) {
1423                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1424                 q_ctrl->default_value = gspca_ctrl->def;
1425                 q_ctrl->minimum = gspca_ctrl->min;
1426                 q_ctrl->maximum = gspca_ctrl->max;
1427         }
1428         if (gspca_dev->ctrl_inac & (1 << idx))
1429                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1430         return 0;
1431 }
1432
1433 static int vidioc_s_ctrl(struct file *file, void *priv,
1434                          struct v4l2_control *ctrl)
1435 {
1436         struct gspca_dev *gspca_dev = video_drvdata(file);
1437         const struct ctrl *ctrls;
1438         struct gspca_ctrl *gspca_ctrl;
1439         int idx;
1440
1441         idx = get_ctrl(gspca_dev, ctrl->id);
1442         if (idx < 0)
1443                 return -EINVAL;
1444         if (gspca_dev->ctrl_inac & (1 << idx))
1445                 return -EINVAL;
1446         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1447         if (gspca_dev->cam.ctrls != NULL) {
1448                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1449                 if (ctrl->value < gspca_ctrl->min
1450                     || ctrl->value > gspca_ctrl->max)
1451                         return -ERANGE;
1452         } else {
1453                 gspca_ctrl = NULL;
1454                 if (ctrl->value < ctrls->qctrl.minimum
1455                     || ctrl->value > ctrls->qctrl.maximum)
1456                         return -ERANGE;
1457         }
1458         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1459         gspca_dev->usb_err = 0;
1460         if (ctrls->set != NULL)
1461                 return ctrls->set(gspca_dev, ctrl->value);
1462         if (gspca_ctrl != NULL) {
1463                 gspca_ctrl->val = ctrl->value;
1464                 if (ctrls->set_control != NULL
1465                  && gspca_dev->streaming)
1466                         ctrls->set_control(gspca_dev);
1467         }
1468         return gspca_dev->usb_err;
1469 }
1470
1471 static int vidioc_g_ctrl(struct file *file, void *priv,
1472                          struct v4l2_control *ctrl)
1473 {
1474         struct gspca_dev *gspca_dev = video_drvdata(file);
1475         const struct ctrl *ctrls;
1476         int idx;
1477
1478         idx = get_ctrl(gspca_dev, ctrl->id);
1479         if (idx < 0)
1480                 return -EINVAL;
1481         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1482
1483         gspca_dev->usb_err = 0;
1484         if (ctrls->get != NULL)
1485                 return ctrls->get(gspca_dev, &ctrl->value);
1486         if (gspca_dev->cam.ctrls != NULL)
1487                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1488         return 0;
1489 }
1490
1491 static int vidioc_querymenu(struct file *file, void *priv,
1492                             struct v4l2_querymenu *qmenu)
1493 {
1494         struct gspca_dev *gspca_dev = video_drvdata(file);
1495
1496         if (!gspca_dev->sd_desc->querymenu)
1497                 return -ENOTTY;
1498         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1499 }
1500
1501 static int vidioc_enum_input(struct file *file, void *priv,
1502                                 struct v4l2_input *input)
1503 {
1504         struct gspca_dev *gspca_dev = video_drvdata(file);
1505
1506         if (input->index != 0)
1507                 return -EINVAL;
1508         input->type = V4L2_INPUT_TYPE_CAMERA;
1509         input->status = gspca_dev->cam.input_flags;
1510         strlcpy(input->name, gspca_dev->sd_desc->name,
1511                 sizeof input->name);
1512         return 0;
1513 }
1514
1515 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1516 {
1517         *i = 0;
1518         return 0;
1519 }
1520
1521 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1522 {
1523         if (i > 0)
1524                 return -EINVAL;
1525         return (0);
1526 }
1527
1528 static int vidioc_reqbufs(struct file *file, void *priv,
1529                           struct v4l2_requestbuffers *rb)
1530 {
1531         struct gspca_dev *gspca_dev = video_drvdata(file);
1532         int i, ret = 0, streaming;
1533
1534         i = rb->memory;                 /* (avoid compilation warning) */
1535         switch (i) {
1536         case GSPCA_MEMORY_READ:                 /* (internal call) */
1537         case V4L2_MEMORY_MMAP:
1538         case V4L2_MEMORY_USERPTR:
1539                 break;
1540         default:
1541                 return -EINVAL;
1542         }
1543         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1544                 return -ERESTARTSYS;
1545
1546         if (gspca_dev->memory != GSPCA_MEMORY_NO
1547             && gspca_dev->memory != GSPCA_MEMORY_READ
1548             && gspca_dev->memory != rb->memory) {
1549                 ret = -EBUSY;
1550                 goto out;
1551         }
1552
1553         /* only one file may do the capture */
1554         if (gspca_dev->capt_file != NULL
1555             && gspca_dev->capt_file != file) {
1556                 ret = -EBUSY;
1557                 goto out;
1558         }
1559
1560         /* if allocated, the buffers must not be mapped */
1561         for (i = 0; i < gspca_dev->nframes; i++) {
1562                 if (gspca_dev->frame[i].vma_use_count) {
1563                         ret = -EBUSY;
1564                         goto out;
1565                 }
1566         }
1567
1568         /* stop streaming */
1569         streaming = gspca_dev->streaming;
1570         if (streaming) {
1571                 gspca_stream_off(gspca_dev);
1572
1573                 /* Don't restart the stream when switching from read
1574                  * to mmap mode */
1575                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1576                         streaming = 0;
1577         }
1578
1579         /* free the previous allocated buffers, if any */
1580         if (gspca_dev->nframes != 0)
1581                 frame_free(gspca_dev);
1582         if (rb->count == 0)                     /* unrequest */
1583                 goto out;
1584         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1585         if (ret == 0) {
1586                 rb->count = gspca_dev->nframes;
1587                 if (streaming)
1588                         ret = gspca_init_transfer(gspca_dev);
1589         }
1590 out:
1591         mutex_unlock(&gspca_dev->queue_lock);
1592         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1593         return ret;
1594 }
1595
1596 static int vidioc_querybuf(struct file *file, void *priv,
1597                            struct v4l2_buffer *v4l2_buf)
1598 {
1599         struct gspca_dev *gspca_dev = video_drvdata(file);
1600         struct gspca_frame *frame;
1601
1602         if (v4l2_buf->index < 0
1603             || v4l2_buf->index >= gspca_dev->nframes)
1604                 return -EINVAL;
1605
1606         frame = &gspca_dev->frame[v4l2_buf->index];
1607         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1608         return 0;
1609 }
1610
1611 static int vidioc_streamon(struct file *file, void *priv,
1612                            enum v4l2_buf_type buf_type)
1613 {
1614         struct gspca_dev *gspca_dev = video_drvdata(file);
1615         int ret;
1616
1617         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1618                 return -EINVAL;
1619         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1620                 return -ERESTARTSYS;
1621
1622         /* check the capture file */
1623         if (gspca_dev->capt_file != file) {
1624                 ret = -EBUSY;
1625                 goto out;
1626         }
1627
1628         if (gspca_dev->nframes == 0
1629             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1630                 ret = -EINVAL;
1631                 goto out;
1632         }
1633         if (!gspca_dev->streaming) {
1634                 ret = gspca_init_transfer(gspca_dev);
1635                 if (ret < 0)
1636                         goto out;
1637         }
1638 #ifdef GSPCA_DEBUG
1639         if (gspca_debug & D_STREAM) {
1640                 PDEBUG_MODE("stream on OK",
1641                         gspca_dev->pixfmt,
1642                         gspca_dev->width,
1643                         gspca_dev->height);
1644         }
1645 #endif
1646         ret = 0;
1647 out:
1648         mutex_unlock(&gspca_dev->queue_lock);
1649         return ret;
1650 }
1651
1652 static int vidioc_streamoff(struct file *file, void *priv,
1653                                 enum v4l2_buf_type buf_type)
1654 {
1655         struct gspca_dev *gspca_dev = video_drvdata(file);
1656         int i, ret;
1657
1658         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1659                 return -EINVAL;
1660
1661         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1662                 return -ERESTARTSYS;
1663
1664         if (!gspca_dev->streaming) {
1665                 ret = 0;
1666                 goto out;
1667         }
1668
1669         /* check the capture file */
1670         if (gspca_dev->capt_file != file) {
1671                 ret = -EBUSY;
1672                 goto out;
1673         }
1674
1675         /* stop streaming */
1676         gspca_stream_off(gspca_dev);
1677         /* In case another thread is waiting in dqbuf */
1678         wake_up_interruptible(&gspca_dev->wq);
1679
1680         /* empty the transfer queues */
1681         for (i = 0; i < gspca_dev->nframes; i++)
1682                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1683         atomic_set(&gspca_dev->fr_q, 0);
1684         atomic_set(&gspca_dev->fr_i, 0);
1685         gspca_dev->fr_o = 0;
1686         ret = 0;
1687 out:
1688         mutex_unlock(&gspca_dev->queue_lock);
1689         return ret;
1690 }
1691
1692 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1693                         struct v4l2_jpegcompression *jpegcomp)
1694 {
1695         struct gspca_dev *gspca_dev = video_drvdata(file);
1696
1697         if (!gspca_dev->sd_desc->get_jcomp)
1698                 return -ENOTTY;
1699         gspca_dev->usb_err = 0;
1700         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1701 }
1702
1703 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1704                         struct v4l2_jpegcompression *jpegcomp)
1705 {
1706         struct gspca_dev *gspca_dev = video_drvdata(file);
1707
1708         if (!gspca_dev->sd_desc->set_jcomp)
1709                 return -ENOTTY;
1710         gspca_dev->usb_err = 0;
1711         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1712 }
1713
1714 static int vidioc_g_parm(struct file *filp, void *priv,
1715                         struct v4l2_streamparm *parm)
1716 {
1717         struct gspca_dev *gspca_dev = video_drvdata(filp);
1718
1719         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1720
1721         if (gspca_dev->sd_desc->get_streamparm) {
1722                 gspca_dev->usb_err = 0;
1723                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1724                 return gspca_dev->usb_err;
1725         }
1726         return 0;
1727 }
1728
1729 static int vidioc_s_parm(struct file *filp, void *priv,
1730                         struct v4l2_streamparm *parm)
1731 {
1732         struct gspca_dev *gspca_dev = video_drvdata(filp);
1733         int n;
1734
1735         n = parm->parm.capture.readbuffers;
1736         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1737                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1738         else
1739                 gspca_dev->nbufread = n;
1740
1741         if (gspca_dev->sd_desc->set_streamparm) {
1742                 gspca_dev->usb_err = 0;
1743                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1744                 return gspca_dev->usb_err;
1745         }
1746
1747         return 0;
1748 }
1749
1750 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1751 {
1752         struct gspca_dev *gspca_dev = video_drvdata(file);
1753         struct gspca_frame *frame;
1754         struct page *page;
1755         unsigned long addr, start, size;
1756         int i, ret;
1757
1758         start = vma->vm_start;
1759         size = vma->vm_end - vma->vm_start;
1760         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1761
1762         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1763                 return -ERESTARTSYS;
1764         if (gspca_dev->capt_file != file) {
1765                 ret = -EINVAL;
1766                 goto out;
1767         }
1768
1769         frame = NULL;
1770         for (i = 0; i < gspca_dev->nframes; ++i) {
1771                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1772                         PDEBUG(D_STREAM, "mmap bad memory type");
1773                         break;
1774                 }
1775                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1776                                                 == vma->vm_pgoff) {
1777                         frame = &gspca_dev->frame[i];
1778                         break;
1779                 }
1780         }
1781         if (frame == NULL) {
1782                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1783                 ret = -EINVAL;
1784                 goto out;
1785         }
1786         if (size != frame->v4l2_buf.length) {
1787                 PDEBUG(D_STREAM, "mmap bad size");
1788                 ret = -EINVAL;
1789                 goto out;
1790         }
1791
1792         /*
1793          * - VM_IO marks the area as being a mmaped region for I/O to a
1794          *   device. It also prevents the region from being core dumped.
1795          */
1796         vma->vm_flags |= VM_IO;
1797
1798         addr = (unsigned long) frame->data;
1799         while (size > 0) {
1800                 page = vmalloc_to_page((void *) addr);
1801                 ret = vm_insert_page(vma, start, page);
1802                 if (ret < 0)
1803                         goto out;
1804                 start += PAGE_SIZE;
1805                 addr += PAGE_SIZE;
1806                 size -= PAGE_SIZE;
1807         }
1808
1809         vma->vm_ops = &gspca_vm_ops;
1810         vma->vm_private_data = frame;
1811         gspca_vm_open(vma);
1812         ret = 0;
1813 out:
1814         mutex_unlock(&gspca_dev->queue_lock);
1815         return ret;
1816 }
1817
1818 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1819                                 enum v4l2_memory memory)
1820 {
1821         if (!gspca_dev->present)
1822                 return -ENODEV;
1823         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1824                         !gspca_dev->streaming)
1825                 return -EINVAL;
1826
1827         /* check if a frame is ready */
1828         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1829 }
1830
1831 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1832                         enum v4l2_memory memory)
1833 {
1834         int ret;
1835
1836         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1837                 return -ERESTARTSYS;
1838         ret = frame_ready_nolock(gspca_dev, file, memory);
1839         mutex_unlock(&gspca_dev->queue_lock);
1840         return ret;
1841 }
1842
1843 /*
1844  * dequeue a video buffer
1845  *
1846  * If nonblock_ing is false, block until a buffer is available.
1847  */
1848 static int vidioc_dqbuf(struct file *file, void *priv,
1849                         struct v4l2_buffer *v4l2_buf)
1850 {
1851         struct gspca_dev *gspca_dev = video_drvdata(file);
1852         struct gspca_frame *frame;
1853         int i, j, ret;
1854
1855         PDEBUG(D_FRAM, "dqbuf");
1856
1857         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1858                 return -ERESTARTSYS;
1859
1860         for (;;) {
1861                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1862                 if (ret < 0)
1863                         goto out;
1864                 if (ret > 0)
1865                         break;
1866
1867                 mutex_unlock(&gspca_dev->queue_lock);
1868
1869                 if (file->f_flags & O_NONBLOCK)
1870                         return -EAGAIN;
1871
1872                 /* wait till a frame is ready */
1873                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1874                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1875                         msecs_to_jiffies(3000));
1876                 if (ret < 0)
1877                         return ret;
1878                 if (ret == 0)
1879                         return -EIO;
1880
1881                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1882                         return -ERESTARTSYS;
1883         }
1884
1885         i = gspca_dev->fr_o;
1886         j = gspca_dev->fr_queue[i];
1887         frame = &gspca_dev->frame[j];
1888
1889         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1890
1891         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1892         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1893         PDEBUG(D_FRAM, "dqbuf %d", j);
1894         ret = 0;
1895
1896         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1897                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1898                                  frame->data,
1899                                  frame->v4l2_buf.bytesused)) {
1900                         PDEBUG(D_ERR|D_STREAM,
1901                                 "dqbuf cp to user failed");
1902                         ret = -EFAULT;
1903                 }
1904         }
1905 out:
1906         mutex_unlock(&gspca_dev->queue_lock);
1907
1908         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1909                 mutex_lock(&gspca_dev->usb_lock);
1910                 gspca_dev->usb_err = 0;
1911                 if (gspca_dev->present)
1912                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1913                 mutex_unlock(&gspca_dev->usb_lock);
1914         }
1915
1916         return ret;
1917 }
1918
1919 /*
1920  * queue a video buffer
1921  *
1922  * Attempting to queue a buffer that has already been
1923  * queued will return -EINVAL.
1924  */
1925 static int vidioc_qbuf(struct file *file, void *priv,
1926                         struct v4l2_buffer *v4l2_buf)
1927 {
1928         struct gspca_dev *gspca_dev = video_drvdata(file);
1929         struct gspca_frame *frame;
1930         int i, index, ret;
1931
1932         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1933
1934         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1935                 return -ERESTARTSYS;
1936
1937         index = v4l2_buf->index;
1938         if ((unsigned) index >= gspca_dev->nframes) {
1939                 PDEBUG(D_FRAM,
1940                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1941                 ret = -EINVAL;
1942                 goto out;
1943         }
1944         if (v4l2_buf->memory != gspca_dev->memory) {
1945                 PDEBUG(D_FRAM, "qbuf bad memory type");
1946                 ret = -EINVAL;
1947                 goto out;
1948         }
1949
1950         frame = &gspca_dev->frame[index];
1951         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1952                 PDEBUG(D_FRAM, "qbuf bad state");
1953                 ret = -EINVAL;
1954                 goto out;
1955         }
1956
1957         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1958
1959         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1960                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1961                 frame->v4l2_buf.length = v4l2_buf->length;
1962         }
1963
1964         /* put the buffer in the 'queued' queue */
1965         i = atomic_read(&gspca_dev->fr_q);
1966         gspca_dev->fr_queue[i] = index;
1967         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1968
1969         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1970         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1971         ret = 0;
1972 out:
1973         mutex_unlock(&gspca_dev->queue_lock);
1974         return ret;
1975 }
1976
1977 /*
1978  * allocate the resources for read()
1979  */
1980 static int read_alloc(struct gspca_dev *gspca_dev,
1981                         struct file *file)
1982 {
1983         struct v4l2_buffer v4l2_buf;
1984         int i, ret;
1985
1986         PDEBUG(D_STREAM, "read alloc");
1987
1988         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1989                 return -ERESTARTSYS;
1990
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                         goto out;
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                                 goto out;
2012                         }
2013                 }
2014         }
2015
2016         /* start streaming */
2017         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2018         if (ret != 0)
2019                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2020 out:
2021         mutex_unlock(&gspca_dev->usb_lock);
2022         return ret;
2023 }
2024
2025 static unsigned int dev_poll(struct file *file, poll_table *wait)
2026 {
2027         struct gspca_dev *gspca_dev = video_drvdata(file);
2028         unsigned long req_events = poll_requested_events(wait);
2029         int ret = 0;
2030
2031         PDEBUG(D_FRAM, "poll");
2032
2033         if (req_events & POLLPRI)
2034                 ret |= v4l2_ctrl_poll(file, wait);
2035
2036         if (req_events & (POLLIN | POLLRDNORM)) {
2037                 /* if reqbufs is not done, the user would use read() */
2038                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2039                         if (read_alloc(gspca_dev, file) != 0) {
2040                                 ret |= POLLERR;
2041                                 goto out;
2042                         }
2043                 }
2044
2045                 poll_wait(file, &gspca_dev->wq, wait);
2046
2047                 /* check if an image has been received */
2048                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
2049                         ret |= POLLERR;
2050                         goto out;
2051                 }
2052                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2053                         ret |= POLLIN | POLLRDNORM;
2054                 mutex_unlock(&gspca_dev->queue_lock);
2055         }
2056
2057 out:
2058         if (!gspca_dev->present)
2059                 ret |= POLLHUP;
2060
2061         return ret;
2062 }
2063
2064 static ssize_t dev_read(struct file *file, char __user *data,
2065                     size_t count, loff_t *ppos)
2066 {
2067         struct gspca_dev *gspca_dev = video_drvdata(file);
2068         struct gspca_frame *frame;
2069         struct v4l2_buffer v4l2_buf;
2070         struct timeval timestamp;
2071         int n, ret, ret2;
2072
2073         PDEBUG(D_FRAM, "read (%zd)", count);
2074         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2075                 ret = read_alloc(gspca_dev, file);
2076                 if (ret != 0)
2077                         return ret;
2078         }
2079
2080         /* get a frame */
2081         timestamp = ktime_to_timeval(ktime_get());
2082         timestamp.tv_sec--;
2083         n = 2;
2084         for (;;) {
2085                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2086                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2087                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2088                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2089                 if (ret != 0) {
2090                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2091                         return ret;
2092                 }
2093
2094                 /* if the process slept for more than 1 second,
2095                  * get a newer frame */
2096                 frame = &gspca_dev->frame[v4l2_buf.index];
2097                 if (--n < 0)
2098                         break;                  /* avoid infinite loop */
2099                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2100                         break;
2101                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2102                 if (ret != 0) {
2103                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2104                         return ret;
2105                 }
2106         }
2107
2108         /* copy the frame */
2109         if (count > frame->v4l2_buf.bytesused)
2110                 count = frame->v4l2_buf.bytesused;
2111         ret = copy_to_user(data, frame->data, count);
2112         if (ret != 0) {
2113                 PDEBUG(D_ERR|D_STREAM,
2114                         "read cp to user lack %d / %zd", ret, count);
2115                 ret = -EFAULT;
2116                 goto out;
2117         }
2118         ret = count;
2119 out:
2120         /* in each case, requeue the buffer */
2121         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2122         if (ret2 != 0)
2123                 return ret2;
2124         return ret;
2125 }
2126
2127 static struct v4l2_file_operations dev_fops = {
2128         .owner = THIS_MODULE,
2129         .open = dev_open,
2130         .release = dev_close,
2131         .read = dev_read,
2132         .mmap = dev_mmap,
2133         .unlocked_ioctl = video_ioctl2,
2134         .poll   = dev_poll,
2135 };
2136
2137 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2138         .vidioc_querycap        = vidioc_querycap,
2139         .vidioc_dqbuf           = vidioc_dqbuf,
2140         .vidioc_qbuf            = vidioc_qbuf,
2141         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2142         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2143         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2144         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2145         .vidioc_streamon        = vidioc_streamon,
2146         .vidioc_queryctrl       = vidioc_queryctrl,
2147         .vidioc_g_ctrl          = vidioc_g_ctrl,
2148         .vidioc_s_ctrl          = vidioc_s_ctrl,
2149         .vidioc_querymenu       = vidioc_querymenu,
2150         .vidioc_enum_input      = vidioc_enum_input,
2151         .vidioc_g_input         = vidioc_g_input,
2152         .vidioc_s_input         = vidioc_s_input,
2153         .vidioc_reqbufs         = vidioc_reqbufs,
2154         .vidioc_querybuf        = vidioc_querybuf,
2155         .vidioc_streamoff       = vidioc_streamoff,
2156         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2157         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2158         .vidioc_g_parm          = vidioc_g_parm,
2159         .vidioc_s_parm          = vidioc_s_parm,
2160         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2161         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2162 #ifdef CONFIG_VIDEO_ADV_DEBUG
2163         .vidioc_g_register      = vidioc_g_register,
2164         .vidioc_s_register      = vidioc_s_register,
2165 #endif
2166         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2167         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2168         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2169 };
2170
2171 static const struct video_device gspca_template = {
2172         .name = "gspca main driver",
2173         .fops = &dev_fops,
2174         .ioctl_ops = &dev_ioctl_ops,
2175         .release = video_device_release_empty, /* We use v4l2_dev.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         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2211                 sd_desc->name, id->idVendor, id->idProduct);
2212
2213         /* create the device */
2214         if (dev_size < sizeof *gspca_dev)
2215                 dev_size = sizeof *gspca_dev;
2216         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2217         if (!gspca_dev) {
2218                 pr_err("couldn't kzalloc gspca struct\n");
2219                 return -ENOMEM;
2220         }
2221         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2222         if (!gspca_dev->usb_buf) {
2223                 pr_err("out of memory\n");
2224                 ret = -ENOMEM;
2225                 goto out;
2226         }
2227         gspca_dev->dev = dev;
2228         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2229
2230         /* check if any audio device */
2231         if (dev->actconfig->desc.bNumInterfaces != 1) {
2232                 int i;
2233                 struct usb_interface *intf2;
2234
2235                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2236                         intf2 = dev->actconfig->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->v4l2_dev.release = gspca_release;
2248         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2249         if (ret)
2250                 goto out;
2251         gspca_dev->sd_desc = sd_desc;
2252         gspca_dev->nbufread = 2;
2253         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2254         gspca_dev->vdev = gspca_template;
2255         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2256         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2257         set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2258         gspca_dev->module = module;
2259         gspca_dev->present = 1;
2260
2261         mutex_init(&gspca_dev->usb_lock);
2262         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2263         mutex_init(&gspca_dev->queue_lock);
2264         init_waitqueue_head(&gspca_dev->wq);
2265
2266         /* configure the subdriver and initialize the USB device */
2267         ret = sd_desc->config(gspca_dev, id);
2268         if (ret < 0)
2269                 goto out;
2270         if (gspca_dev->cam.ctrls != NULL)
2271                 ctrls_init(gspca_dev);
2272         ret = sd_desc->init(gspca_dev);
2273         if (ret < 0)
2274                 goto out;
2275         if (sd_desc->init_controls)
2276                 ret = sd_desc->init_controls(gspca_dev);
2277         if (ret < 0)
2278                 goto out;
2279         gspca_set_default_mode(gspca_dev);
2280
2281         ret = gspca_input_connect(gspca_dev);
2282         if (ret)
2283                 goto out;
2284
2285         /*
2286          * Don't take usb_lock for these ioctls. This improves latency if
2287          * usb_lock is taken for a long time, e.g. when changing a control
2288          * value, and a new frame is ready to be dequeued.
2289          */
2290         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2291         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2292         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2293
2294         /* init video stuff */
2295         ret = video_register_device(&gspca_dev->vdev,
2296                                   VFL_TYPE_GRABBER,
2297                                   -1);
2298         if (ret < 0) {
2299                 pr_err("video_register_device err %d\n", ret);
2300                 goto out;
2301         }
2302
2303         usb_set_intfdata(intf, gspca_dev);
2304         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2305
2306         gspca_input_create_urb(gspca_dev);
2307
2308         return 0;
2309 out:
2310 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2311         if (gspca_dev->input_dev)
2312                 input_unregister_device(gspca_dev->input_dev);
2313 #endif
2314         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2315         kfree(gspca_dev->usb_buf);
2316         kfree(gspca_dev);
2317         return ret;
2318 }
2319 EXPORT_SYMBOL(gspca_dev_probe2);
2320
2321 /* same function as the previous one, but check the interface */
2322 int gspca_dev_probe(struct usb_interface *intf,
2323                 const struct usb_device_id *id,
2324                 const struct sd_desc *sd_desc,
2325                 int dev_size,
2326                 struct module *module)
2327 {
2328         struct usb_device *dev = interface_to_usbdev(intf);
2329
2330         /* we don't handle multi-config cameras */
2331         if (dev->descriptor.bNumConfigurations != 1) {
2332                 pr_err("%04x:%04x too many config\n",
2333                        id->idVendor, id->idProduct);
2334                 return -ENODEV;
2335         }
2336
2337         /* the USB video interface must be the first one */
2338         if (dev->actconfig->desc.bNumInterfaces != 1
2339          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2340                 return -ENODEV;
2341
2342         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2343 }
2344 EXPORT_SYMBOL(gspca_dev_probe);
2345
2346 /*
2347  * USB disconnection
2348  *
2349  * This function must be called by the sub-driver
2350  * when the device disconnects, after the specific resources are freed.
2351  */
2352 void gspca_disconnect(struct usb_interface *intf)
2353 {
2354         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2355 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2356         struct input_dev *input_dev;
2357 #endif
2358
2359         PDEBUG(D_PROBE, "%s disconnect",
2360                 video_device_node_name(&gspca_dev->vdev));
2361
2362         mutex_lock(&gspca_dev->usb_lock);
2363
2364         usb_set_intfdata(intf, NULL);
2365         gspca_dev->dev = NULL;
2366         gspca_dev->present = 0;
2367         destroy_urbs(gspca_dev);
2368
2369 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2370         gspca_input_destroy_urb(gspca_dev);
2371         input_dev = gspca_dev->input_dev;
2372         if (input_dev) {
2373                 gspca_dev->input_dev = NULL;
2374                 input_unregister_device(input_dev);
2375         }
2376 #endif
2377         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2378         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2379                 gspca_dev->sd_desc->stop0(gspca_dev);
2380         gspca_dev->streaming = 0;
2381         wake_up_interruptible(&gspca_dev->wq);
2382
2383         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2384         video_unregister_device(&gspca_dev->vdev);
2385
2386         mutex_unlock(&gspca_dev->usb_lock);
2387
2388         /* (this will call gspca_release() immediately or on last close) */
2389         v4l2_device_put(&gspca_dev->v4l2_dev);
2390 }
2391 EXPORT_SYMBOL(gspca_disconnect);
2392
2393 #ifdef CONFIG_PM
2394 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2395 {
2396         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2397
2398         if (!gspca_dev->streaming)
2399                 return 0;
2400         mutex_lock(&gspca_dev->usb_lock);
2401         gspca_dev->frozen = 1;          /* avoid urb error messages */
2402         gspca_dev->usb_err = 0;
2403         if (gspca_dev->sd_desc->stopN)
2404                 gspca_dev->sd_desc->stopN(gspca_dev);
2405         destroy_urbs(gspca_dev);
2406         gspca_input_destroy_urb(gspca_dev);
2407         gspca_set_alt0(gspca_dev);
2408         if (gspca_dev->sd_desc->stop0)
2409                 gspca_dev->sd_desc->stop0(gspca_dev);
2410         mutex_unlock(&gspca_dev->usb_lock);
2411         return 0;
2412 }
2413 EXPORT_SYMBOL(gspca_suspend);
2414
2415 int gspca_resume(struct usb_interface *intf)
2416 {
2417         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2418         int streaming, ret = 0;
2419
2420         mutex_lock(&gspca_dev->usb_lock);
2421         gspca_dev->frozen = 0;
2422         gspca_dev->usb_err = 0;
2423         gspca_dev->sd_desc->init(gspca_dev);
2424         gspca_input_create_urb(gspca_dev);
2425         /*
2426          * Most subdrivers send all ctrl values on sd_start and thus
2427          * only write to the device registers on s_ctrl when streaming ->
2428          * Clear streaming to avoid setting all ctrls twice.
2429          */
2430         streaming = gspca_dev->streaming;
2431         gspca_dev->streaming = 0;
2432         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
2433         if (streaming)
2434                 ret = gspca_init_transfer(gspca_dev);
2435         mutex_unlock(&gspca_dev->usb_lock);
2436         return ret;
2437 }
2438 EXPORT_SYMBOL(gspca_resume);
2439 #endif
2440
2441 /* -- module insert / remove -- */
2442 static int __init gspca_init(void)
2443 {
2444         pr_info("v" GSPCA_VERSION " registered\n");
2445         return 0;
2446 }
2447 static void __exit gspca_exit(void)
2448 {
2449 }
2450
2451 module_init(gspca_init);
2452 module_exit(gspca_exit);
2453
2454 #ifdef GSPCA_DEBUG
2455 module_param_named(debug, gspca_debug, int, 0644);
2456 MODULE_PARM_DESC(debug,
2457                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2458                 " 0x08:stream 0x10:frame 0x20:packet"
2459                 " 0x0100: v4l2");
2460 #endif