drivers/media/usb/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 IS_ENABLED(CONFIG_INPUT)
  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 int gspca_debug;
  64 EXPORT_SYMBOL(gspca_debug);
  65
  66 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
  67                         __u32 pixfmt, int w, int h)
  68 {
  69         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  70                 PDEBUG(debug, "%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(debug, "%s 0x%08x %dx%d",
  79                         txt,
  80                         pixfmt,
  81                         w, h);
  82         }
  83 }
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if IS_ENABLED(CONFIG_INPUT)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PERR("Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PERR("URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         pr_err("Resubmit URB failed with error %i\n", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         pr_err("Input device registration failed with error %i\n",
 181                                err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, buffer_len,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PERR("submit int URB failed with error %i", ret);
 230                 goto error_submit;
 231         }
 232         gspca_dev->int_urb = urb;
 233         return ret;
 234
 235 error_submit:
 236         usb_free_coherent(dev,
 237                           urb->transfer_buffer_length,
 238                           urb->transfer_buffer,
 239                           urb->transfer_dma);
 240 error_buffer:
 241         usb_free_urb(urb);
 242 error:
 243         return ret;
 244 }
 245
 246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 247 {
 248         struct usb_interface *intf;
 249         struct usb_host_interface *intf_desc;
 250         struct usb_endpoint_descriptor *ep;
 251         int i;
 252
 253         if (gspca_dev->sd_desc->int_pkt_scan)  {
 254                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 255                 intf_desc = intf->cur_altsetting;
 256                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 257                         ep = &intf_desc->endpoint[i].desc;
 258                         if (usb_endpoint_dir_in(ep) &&
 259                             usb_endpoint_xfer_int(ep)) {
 260
 261                                 alloc_and_submit_int_urb(gspca_dev, ep);
 262                                 break;
 263                         }
 264                 }
 265         }
 266 }
 267
 268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 269 {
 270         struct urb *urb;
 271
 272         urb = gspca_dev->int_urb;
 273         if (urb) {
 274                 gspca_dev->int_urb = NULL;
 275                 usb_kill_urb(urb);
 276                 usb_free_coherent(gspca_dev->dev,
 277                                   urb->transfer_buffer_length,
 278                                   urb->transfer_buffer,
 279                                   urb->transfer_dma);
 280                 usb_free_urb(urb);
 281         }
 282 }
 283 #else
 284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 285 {
 286 }
 287
 288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 289 {
 290 }
 291
 292 static inline int gspca_input_connect(struct gspca_dev *dev)
 293 {
 294         return 0;
 295 }
 296 #endif
 297
 298 /*
 299  * fill a video frame from an URB and resubmit
 300  */
 301 static void fill_frame(struct gspca_dev *gspca_dev,
 302                         struct urb *urb)
 303 {
 304         u8 *data;               /* address of data in the iso message */
 305         int i, len, st;
 306         cam_pkt_op pkt_scan;
 307
 308         if (urb->status != 0) {
 309                 if (urb->status == -ESHUTDOWN)
 310                         return;         /* disconnection */
 311 #ifdef CONFIG_PM
 312                 if (gspca_dev->frozen)
 313                         return;
 314 #endif
 315                 PERR("urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321                 len = urb->iso_frame_desc[i].actual_length;
 322
 323                 /* check the packet status and length */
 324                 st = urb->iso_frame_desc[i].status;
 325                 if (st) {
 326                         pr_err("ISOC data error: [%d] len=%d, status=%d\n",
 327                                i, len, st);
 328                         gspca_dev->last_packet_type = DISCARD_PACKET;
 329                         continue;
 330                 }
 331                 if (len == 0) {
 332                         if (gspca_dev->empty_packet == 0)
 333                                 gspca_dev->empty_packet = 1;
 334                         continue;
 335                 }
 336
 337                 /* let the packet be analyzed by the subdriver */
 338                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 339                         i, urb->iso_frame_desc[i].offset, len);
 340                 data = (u8 *) urb->transfer_buffer
 341                                         + urb->iso_frame_desc[i].offset;
 342                 pkt_scan(gspca_dev, data, len);
 343         }
 344
 345 resubmit:
 346         /* resubmit the URB */
 347         st = usb_submit_urb(urb, GFP_ATOMIC);
 348         if (st < 0)
 349                 pr_err("usb_submit_urb() ret %d\n", st);
 350 }
 351
 352 /*
 353  * ISOC message interrupt from the USB device
 354  *
 355  * Analyse each packet and call the subdriver for copy to the frame buffer.
 356  */
 357 static void isoc_irq(struct urb *urb)
 358 {
 359         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 360
 361         PDEBUG(D_PACK, "isoc irq");
 362         if (!gspca_dev->streaming)
 363                 return;
 364         fill_frame(gspca_dev, urb);
 365 }
 366
 367 /*
 368  * bulk message interrupt from the USB device
 369  */
 370 static void bulk_irq(struct urb *urb)
 371 {
 372         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 373         int st;
 374
 375         PDEBUG(D_PACK, "bulk irq");
 376         if (!gspca_dev->streaming)
 377                 return;
 378         switch (urb->status) {
 379         case 0:
 380                 break;
 381         case -ESHUTDOWN:
 382                 return;         /* disconnection */
 383         default:
 384 #ifdef CONFIG_PM
 385                 if (gspca_dev->frozen)
 386                         return;
 387 #endif
 388                 PERR("urb status: %d", urb->status);
 389                 urb->status = 0;
 390                 goto resubmit;
 391         }
 392
 393         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 394         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 395                                 urb->transfer_buffer,
 396                                 urb->actual_length);
 397
 398 resubmit:
 399         /* resubmit the URB */
 400         if (gspca_dev->cam.bulk_nurbs != 0) {
 401                 st = usb_submit_urb(urb, GFP_ATOMIC);
 402                 if (st < 0)
 403                         pr_err("usb_submit_urb() ret %d\n", st);
 404         }
 405 }
 406
 407 /*
 408  * add data to the current frame
 409  *
 410  * This function is called by the subdrivers at interrupt level.
 411  *
 412  * To build a frame, these ones must add
 413  *      - one FIRST_PACKET
 414  *      - 0 or many INTER_PACKETs
 415  *      - one LAST_PACKET
 416  * DISCARD_PACKET invalidates the whole frame.
 417  */
 418 void gspca_frame_add(struct gspca_dev *gspca_dev,
 419                         enum gspca_packet_type packet_type,
 420                         const u8 *data,
 421                         int len)
 422 {
 423         struct gspca_frame *frame;
 424         int i, j;
 425
 426         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 427
 428         if (packet_type == FIRST_PACKET) {
 429                 i = atomic_read(&gspca_dev->fr_i);
 430
 431                 /* if there are no queued buffer, discard the whole frame */
 432                 if (i == atomic_read(&gspca_dev->fr_q)) {
 433                         gspca_dev->last_packet_type = DISCARD_PACKET;
 434                         gspca_dev->sequence++;
 435                         return;
 436                 }
 437                 j = gspca_dev->fr_queue[i];
 438                 frame = &gspca_dev->frame[j];
 439                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 440                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 441                 gspca_dev->image = frame->data;
 442                 gspca_dev->image_len = 0;
 443         } else {
 444                 switch (gspca_dev->last_packet_type) {
 445                 case DISCARD_PACKET:
 446                         if (packet_type == LAST_PACKET) {
 447                                 gspca_dev->last_packet_type = packet_type;
 448                                 gspca_dev->image = NULL;
 449                                 gspca_dev->image_len = 0;
 450                         }
 451                         return;
 452                 case LAST_PACKET:
 453                         return;
 454                 }
 455         }
 456
 457         /* append the packet to the frame buffer */
 458         if (len > 0) {
 459                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 460                         PERR("frame overflow %d > %d",
 461                                 gspca_dev->image_len + len,
 462                                 gspca_dev->frsz);
 463                         packet_type = DISCARD_PACKET;
 464                 } else {
 465 /* !! image is NULL only when last pkt is LAST or DISCARD
 466                         if (gspca_dev->image == NULL) {
 467                                 pr_err("gspca_frame_add() image == NULL\n");
 468                                 return;
 469                         }
 470  */
 471                         memcpy(gspca_dev->image + gspca_dev->image_len,
 472                                 data, len);
 473                         gspca_dev->image_len += len;
 474                 }
 475         }
 476         gspca_dev->last_packet_type = packet_type;
 477
 478         /* if last packet, invalidate packet concatenation until
 479          * next first packet, wake up the application and advance
 480          * in the queue */
 481         if (packet_type == LAST_PACKET) {
 482                 i = atomic_read(&gspca_dev->fr_i);
 483                 j = gspca_dev->fr_queue[i];
 484                 frame = &gspca_dev->frame[j];
 485                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 486                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 487                                          | V4L2_BUF_FLAG_DONE)
 488                                         & ~V4L2_BUF_FLAG_QUEUED;
 489                 i = (i + 1) % GSPCA_MAX_FRAMES;
 490                 atomic_set(&gspca_dev->fr_i, i);
 491                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 492                 PDEBUG(D_FRAM, "frame complete len:%d",
 493                         frame->v4l2_buf.bytesused);
 494                 gspca_dev->image = NULL;
 495                 gspca_dev->image_len = 0;
 496         }
 497 }
 498 EXPORT_SYMBOL(gspca_frame_add);
 499
 500 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 501                         enum v4l2_memory memory, unsigned int count)
 502 {
 503         struct gspca_frame *frame;
 504         unsigned int frsz;
 505         int i;
 506
 507         frsz = gspca_dev->pixfmt.sizeimage;
 508         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 509         frsz = PAGE_ALIGN(frsz);
 510         if (count >= GSPCA_MAX_FRAMES)
 511                 count = GSPCA_MAX_FRAMES - 1;
 512         gspca_dev->frbuf = vmalloc_32(frsz * count);
 513         if (!gspca_dev->frbuf) {
 514                 pr_err("frame alloc failed\n");
 515                 return -ENOMEM;
 516         }
 517         gspca_dev->capt_file = file;
 518         gspca_dev->memory = memory;
 519         gspca_dev->frsz = frsz;
 520         gspca_dev->nframes = count;
 521         for (i = 0; i < count; i++) {
 522                 frame = &gspca_dev->frame[i];
 523                 frame->v4l2_buf.index = i;
 524                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 525                 frame->v4l2_buf.flags = 0;
 526                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 527                 frame->v4l2_buf.length = frsz;
 528                 frame->v4l2_buf.memory = memory;
 529                 frame->v4l2_buf.sequence = 0;
 530                 frame->data = gspca_dev->frbuf + i * frsz;
 531                 frame->v4l2_buf.m.offset = i * frsz;
 532         }
 533         atomic_set(&gspca_dev->fr_q, 0);
 534         atomic_set(&gspca_dev->fr_i, 0);
 535         gspca_dev->fr_o = 0;
 536         return 0;
 537 }
 538
 539 static void frame_free(struct gspca_dev *gspca_dev)
 540 {
 541         int i;
 542
 543         PDEBUG(D_STREAM, "frame free");
 544         if (gspca_dev->frbuf != NULL) {
 545                 vfree(gspca_dev->frbuf);
 546                 gspca_dev->frbuf = NULL;
 547                 for (i = 0; i < gspca_dev->nframes; i++)
 548                         gspca_dev->frame[i].data = NULL;
 549         }
 550         gspca_dev->nframes = 0;
 551         gspca_dev->frsz = 0;
 552         gspca_dev->capt_file = NULL;
 553         gspca_dev->memory = GSPCA_MEMORY_NO;
 554 }
 555
 556 static void destroy_urbs(struct gspca_dev *gspca_dev)
 557 {
 558         struct urb *urb;
 559         unsigned int i;
 560
 561         PDEBUG(D_STREAM, "kill transfer");
 562         for (i = 0; i < MAX_NURBS; i++) {
 563                 urb = gspca_dev->urb[i];
 564                 if (urb == NULL)
 565                         break;
 566
 567                 gspca_dev->urb[i] = NULL;
 568                 usb_kill_urb(urb);
 569                 usb_free_coherent(gspca_dev->dev,
 570                                   urb->transfer_buffer_length,
 571                                   urb->transfer_buffer,
 572                                   urb->transfer_dma);
 573                 usb_free_urb(urb);
 574         }
 575 }
 576
 577 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 578 {
 579         int ret;
 580
 581         if (gspca_dev->alt == 0)
 582                 return 0;
 583         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 584         if (ret < 0)
 585                 pr_err("set alt 0 err %d\n", ret);
 586         return ret;
 587 }
 588
 589 /* Note: both the queue and the usb locks should be held when calling this */
 590 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 591 {
 592         gspca_dev->streaming = 0;
 593         gspca_dev->usb_err = 0;
 594         if (gspca_dev->sd_desc->stopN)
 595                 gspca_dev->sd_desc->stopN(gspca_dev);
 596         destroy_urbs(gspca_dev);
 597         gspca_input_destroy_urb(gspca_dev);
 598         gspca_set_alt0(gspca_dev);
 599         gspca_input_create_urb(gspca_dev);
 600         if (gspca_dev->sd_desc->stop0)
 601                 gspca_dev->sd_desc->stop0(gspca_dev);
 602         PDEBUG(D_STREAM, "stream off OK");
 603 }
 604
 605 /*
 606  * look for an input transfer endpoint in an alternate setting
 607  */
 608 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 609                                           int xfer)
 610 {
 611         struct usb_host_endpoint *ep;
 612         int i, attr;
 613
 614         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 615                 ep = &alt->endpoint[i];
 616                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 617                 if (attr == xfer
 618                     && ep->desc.wMaxPacketSize != 0
 619                     && usb_endpoint_dir_in(&ep->desc))
 620                         return ep;
 621         }
 622         return NULL;
 623 }
 624
 625 /* compute the minimum bandwidth for the current transfer */
 626 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 627 {
 628         u32 bandwidth;
 629
 630         /* get the (max) image size */
 631         bandwidth = gspca_dev->pixfmt.sizeimage;
 632
 633         /* if the image is compressed, estimate its mean size */
 634         if (!gspca_dev->cam.needs_full_bandwidth &&
 635             bandwidth < gspca_dev->pixfmt.width *
 636                                 gspca_dev->pixfmt.height)
 637                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 638
 639         /* estimate the frame rate */
 640         if (gspca_dev->sd_desc->get_streamparm) {
 641                 struct v4l2_streamparm parm;
 642
 643                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 644                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 645                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 646         } else {
 647
 648                 /* don't hope more than 15 fps with USB 1.1 and
 649                  * image resolution >= 640x480 */
 650                 if (gspca_dev->pixfmt.width >= 640
 651                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 652                         bandwidth *= 15;                /* 15 fps */
 653                 else
 654                         bandwidth *= 30;                /* 30 fps */
 655         }
 656
 657         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 658         return bandwidth;
 659 }
 660
 661 /* endpoint table */
 662 #define MAX_ALT 16
 663 struct ep_tb_s {
 664         u32 alt;
 665         u32 bandwidth;
 666 };
 667
 668 /*
 669  * build the table of the endpoints
 670  * and compute the minimum bandwidth for the image transfer
 671  */
 672 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 673                         struct usb_interface *intf,
 674                         struct ep_tb_s *ep_tb)
 675 {
 676         struct usb_host_endpoint *ep;
 677         int i, j, nbalt, psize, found;
 678         u32 bandwidth, last_bw;
 679
 680         nbalt = intf->num_altsetting;
 681         if (nbalt > MAX_ALT)
 682                 nbalt = MAX_ALT;        /* fixme: should warn */
 683
 684         /* build the endpoint table */
 685         i = 0;
 686         last_bw = 0;
 687         for (;;) {
 688                 ep_tb->bandwidth = 2000 * 2000 * 120;
 689                 found = 0;
 690                 for (j = 0; j < nbalt; j++) {
 691                         ep = alt_xfer(&intf->altsetting[j],
 692                                       USB_ENDPOINT_XFER_ISOC);
 693                         if (ep == NULL)
 694                                 continue;
 695                         if (ep->desc.bInterval == 0) {
 696                                 pr_err("alt %d iso endp with 0 interval\n", j);
 697                                 continue;
 698                         }
 699                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 700                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 701                         bandwidth = psize * 1000;
 702                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 703                          || gspca_dev->dev->speed == USB_SPEED_SUPER)
 704                                 bandwidth *= 8;
 705                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 706                         if (bandwidth <= last_bw)
 707                                 continue;
 708                         if (bandwidth < ep_tb->bandwidth) {
 709                                 ep_tb->bandwidth = bandwidth;
 710                                 ep_tb->alt = j;
 711                                 found = 1;
 712                         }
 713                 }
 714                 if (!found)
 715                         break;
 716                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 717                                 ep_tb->alt, ep_tb->bandwidth);
 718                 last_bw = ep_tb->bandwidth;
 719                 i++;
 720                 ep_tb++;
 721         }
 722
 723         /*
 724          * If the camera:
 725          * has a usb audio class interface (a built in usb mic); and
 726          * is a usb 1 full speed device; and
 727          * uses the max full speed iso bandwidth; and
 728          * and has more than 1 alt setting
 729          * then skip the highest alt setting to spare bandwidth for the mic
 730          */
 731         if (gspca_dev->audio &&
 732                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 733                         last_bw >= 1000000 &&
 734                         i > 1) {
 735                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 736                 i--;
 737                 ep_tb--;
 738         }
 739
 740         /* get the requested bandwidth and start at the highest atlsetting */
 741         bandwidth = which_bandwidth(gspca_dev);
 742         ep_tb--;
 743         while (i > 1) {
 744                 ep_tb--;
 745                 if (ep_tb->bandwidth < bandwidth)
 746                         break;
 747                 i--;
 748         }
 749         return i;
 750 }
 751
 752 /*
 753  * create the URBs for image transfer
 754  */
 755 static int create_urbs(struct gspca_dev *gspca_dev,
 756                         struct usb_host_endpoint *ep)
 757 {
 758         struct urb *urb;
 759         int n, nurbs, i, psize, npkt, bsize;
 760
 761         /* calculate the packet size and the number of packets */
 762         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 763
 764         if (!gspca_dev->cam.bulk) {             /* isoc */
 765
 766                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 767                 if (gspca_dev->pkt_size == 0)
 768                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 769                 else
 770                         psize = gspca_dev->pkt_size;
 771                 npkt = gspca_dev->cam.npkt;
 772                 if (npkt == 0)
 773                         npkt = 32;              /* default value */
 774                 bsize = psize * npkt;
 775                 PDEBUG(D_STREAM,
 776                         "isoc %d pkts size %d = bsize:%d",
 777                         npkt, psize, bsize);
 778                 nurbs = DEF_NURBS;
 779         } else {                                /* bulk */
 780                 npkt = 0;
 781                 bsize = gspca_dev->cam.bulk_size;
 782                 if (bsize == 0)
 783                         bsize = psize;
 784                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 785                 if (gspca_dev->cam.bulk_nurbs != 0)
 786                         nurbs = gspca_dev->cam.bulk_nurbs;
 787                 else
 788                         nurbs = 1;
 789         }
 790
 791         for (n = 0; n < nurbs; n++) {
 792                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 793                 if (!urb) {
 794                         pr_err("usb_alloc_urb failed\n");
 795                         return -ENOMEM;
 796                 }
 797                 gspca_dev->urb[n] = urb;
 798                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 799                                                 bsize,
 800                                                 GFP_KERNEL,
 801                                                 &urb->transfer_dma);
 802
 803                 if (urb->transfer_buffer == NULL) {
 804                         pr_err("usb_alloc_coherent failed\n");
 805                         return -ENOMEM;
 806                 }
 807                 urb->dev = gspca_dev->dev;
 808                 urb->context = gspca_dev;
 809                 urb->transfer_buffer_length = bsize;
 810                 if (npkt != 0) {                /* ISOC */
 811                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 812                                                     ep->desc.bEndpointAddress);
 813                         urb->transfer_flags = URB_ISO_ASAP
 814                                         | URB_NO_TRANSFER_DMA_MAP;
 815                         urb->interval = 1 << (ep->desc.bInterval - 1);
 816                         urb->complete = isoc_irq;
 817                         urb->number_of_packets = npkt;
 818                         for (i = 0; i < npkt; i++) {
 819                                 urb->iso_frame_desc[i].length = psize;
 820                                 urb->iso_frame_desc[i].offset = psize * i;
 821                         }
 822                 } else {                /* bulk */
 823                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 824                                                 ep->desc.bEndpointAddress);
 825                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 826                         urb->complete = bulk_irq;
 827                 }
 828         }
 829         return 0;
 830 }
 831
 832 /*
 833  * start the USB transfer
 834  */
 835 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 836 {
 837         struct usb_interface *intf;
 838         struct usb_host_endpoint *ep;
 839         struct urb *urb;
 840         struct ep_tb_s ep_tb[MAX_ALT];
 841         int n, ret, xfer, alt, alt_idx;
 842
 843         /* reset the streaming variables */
 844         gspca_dev->image = NULL;
 845         gspca_dev->image_len = 0;
 846         gspca_dev->last_packet_type = DISCARD_PACKET;
 847         gspca_dev->sequence = 0;
 848
 849         gspca_dev->usb_err = 0;
 850
 851         /* do the specific subdriver stuff before endpoint selection */
 852         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 853         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 854         if (gspca_dev->sd_desc->isoc_init) {
 855                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 856                 if (ret < 0)
 857                         return ret;
 858         }
 859         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 860                                    : USB_ENDPOINT_XFER_ISOC;
 861
 862         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 863         if (gspca_dev->alt != 0) {
 864                 gspca_dev->alt--;       /* (previous version compatibility) */
 865                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
 866                 if (ep == NULL) {
 867                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 868                         return -EIO;
 869                 }
 870                 ep_tb[0].alt = gspca_dev->alt;
 871                 alt_idx = 1;
 872         } else {
 873
 874         /* else, compute the minimum bandwidth
 875          * and build the endpoint table */
 876                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 877                 if (alt_idx <= 0) {
 878                         pr_err("no transfer endpoint found\n");
 879                         return -EIO;
 880                 }
 881         }
 882
 883         /* set the highest alternate setting and
 884          * loop until urb submit succeeds */
 885         gspca_input_destroy_urb(gspca_dev);
 886
 887         gspca_dev->alt = ep_tb[--alt_idx].alt;
 888         alt = -1;
 889         for (;;) {
 890                 if (alt != gspca_dev->alt) {
 891                         alt = gspca_dev->alt;
 892                         if (intf->num_altsetting > 1) {
 893                                 ret = usb_set_interface(gspca_dev->dev,
 894                                                         gspca_dev->iface,
 895                                                         alt);
 896                                 if (ret < 0) {
 897                                         if (ret == -ENOSPC)
 898                                                 goto retry; /*fixme: ugly*/
 899                                         pr_err("set alt %d err %d\n", alt, ret);
 900                                         goto out;
 901                                 }
 902                         }
 903                 }
 904                 if (!gspca_dev->cam.no_urb_create) {
 905                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 906                         ret = create_urbs(gspca_dev,
 907                                 alt_xfer(&intf->altsetting[alt], xfer));
 908                         if (ret < 0) {
 909                                 destroy_urbs(gspca_dev);
 910                                 goto out;
 911                         }
 912                 }
 913
 914                 /* clear the bulk endpoint */
 915                 if (gspca_dev->cam.bulk)
 916                         usb_clear_halt(gspca_dev->dev,
 917                                         gspca_dev->urb[0]->pipe);
 918
 919                 /* start the cam */
 920                 ret = gspca_dev->sd_desc->start(gspca_dev);
 921                 if (ret < 0) {
 922                         destroy_urbs(gspca_dev);
 923                         goto out;
 924                 }
 925                 gspca_dev->streaming = 1;
 926                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 927
 928                 /* some bulk transfers are started by the subdriver */
 929                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 930                         break;
 931
 932                 /* submit the URBs */
 933                 for (n = 0; n < MAX_NURBS; n++) {
 934                         urb = gspca_dev->urb[n];
 935                         if (urb == NULL)
 936                                 break;
 937                         ret = usb_submit_urb(urb, GFP_KERNEL);
 938                         if (ret < 0)
 939                                 break;
 940                 }
 941                 if (ret >= 0)
 942                         break;                  /* transfer is started */
 943
 944                 /* something when wrong
 945                  * stop the webcam and free the transfer resources */
 946                 gspca_stream_off(gspca_dev);
 947                 if (ret != -ENOSPC) {
 948                         pr_err("usb_submit_urb alt %d err %d\n",
 949                                gspca_dev->alt, ret);
 950                         goto out;
 951                 }
 952
 953                 /* the bandwidth is not wide enough
 954                  * negotiate or try a lower alternate setting */
 955 retry:
 956                 PERR("alt %d - bandwidth not wide enough, trying again", alt);
 957                 msleep(20);     /* wait for kill complete */
 958                 if (gspca_dev->sd_desc->isoc_nego) {
 959                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 960                         if (ret < 0)
 961                                 goto out;
 962                 } else {
 963                         if (alt_idx <= 0) {
 964                                 pr_err("no transfer endpoint found\n");
 965                                 ret = -EIO;
 966                                 goto out;
 967                         }
 968                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 969                 }
 970         }
 971 out:
 972         gspca_input_create_urb(gspca_dev);
 973         return ret;
 974 }
 975
 976 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 977 {
 978         int i;
 979
 980         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 981         gspca_dev->curr_mode = i;
 982         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 983
 984         /* does nothing if ctrl_handler == NULL */
 985         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 986 }
 987
 988 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 989                         int width, int height)
 990 {
 991         int i;
 992
 993         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 994                 if (width >= gspca_dev->cam.cam_mode[i].width
 995                     && height >= gspca_dev->cam.cam_mode[i].height)
 996                         break;
 997         }
 998         return i;
 999 }
1000
1001 /*
1002  * search a mode with the right pixel format
1003  */
1004 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1005                         int mode,
1006                         int pixfmt)
1007 {
1008         int modeU, modeD;
1009
1010         modeU = modeD = mode;
1011         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1012                 if (--modeD >= 0) {
1013                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1014                                                                 == pixfmt)
1015                                 return modeD;
1016                 }
1017                 if (++modeU < gspca_dev->cam.nmodes) {
1018                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1019                                                                 == pixfmt)
1020                                 return modeU;
1021                 }
1022         }
1023         return -EINVAL;
1024 }
1025
1026 #ifdef CONFIG_VIDEO_ADV_DEBUG
1027 static int vidioc_g_chip_info(struct file *file, void *priv,
1028                                 struct v4l2_dbg_chip_info *chip)
1029 {
1030         struct gspca_dev *gspca_dev = video_drvdata(file);
1031
1032         gspca_dev->usb_err = 0;
1033         if (gspca_dev->sd_desc->get_chip_info)
1034                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1035         return chip->match.addr ? -EINVAL : 0;
1036 }
1037
1038 static int vidioc_g_register(struct file *file, void *priv,
1039                 struct v4l2_dbg_register *reg)
1040 {
1041         struct gspca_dev *gspca_dev = video_drvdata(file);
1042
1043         gspca_dev->usb_err = 0;
1044         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1045 }
1046
1047 static int vidioc_s_register(struct file *file, void *priv,
1048                 const struct v4l2_dbg_register *reg)
1049 {
1050         struct gspca_dev *gspca_dev = video_drvdata(file);
1051
1052         gspca_dev->usb_err = 0;
1053         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1054 }
1055 #endif
1056
1057 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1058                                 struct v4l2_fmtdesc *fmtdesc)
1059 {
1060         struct gspca_dev *gspca_dev = video_drvdata(file);
1061         int i, j, index;
1062         __u32 fmt_tb[8];
1063
1064         /* give an index to each format */
1065         index = 0;
1066         j = 0;
1067         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1068                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1069                 j = 0;
1070                 for (;;) {
1071                         if (fmt_tb[j] == fmt_tb[index])
1072                                 break;
1073                         j++;
1074                 }
1075                 if (j == index) {
1076                         if (fmtdesc->index == index)
1077                                 break;          /* new format */
1078                         index++;
1079                         if (index >= ARRAY_SIZE(fmt_tb))
1080                                 return -EINVAL;
1081                 }
1082         }
1083         if (i < 0)
1084                 return -EINVAL;         /* no more format */
1085
1086         fmtdesc->pixelformat = fmt_tb[index];
1087         if (gspca_dev->cam.cam_mode[i].sizeimage <
1088                         gspca_dev->cam.cam_mode[i].width *
1089                                 gspca_dev->cam.cam_mode[i].height)
1090                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1091         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1092         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1093         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1094         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1095         fmtdesc->description[4] = '\0';
1096         return 0;
1097 }
1098
1099 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1100                             struct v4l2_format *fmt)
1101 {
1102         struct gspca_dev *gspca_dev = video_drvdata(file);
1103
1104         fmt->fmt.pix = gspca_dev->pixfmt;
1105         /* some drivers use priv internally, zero it before giving it to
1106            userspace */
1107         fmt->fmt.pix.priv = 0;
1108         return 0;
1109 }
1110
1111 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1112                         struct v4l2_format *fmt)
1113 {
1114         int w, h, mode, mode2;
1115
1116         w = fmt->fmt.pix.width;
1117         h = fmt->fmt.pix.height;
1118
1119         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1120                     fmt->fmt.pix.pixelformat, w, h);
1121
1122         /* search the closest mode for width and height */
1123         mode = wxh_to_mode(gspca_dev, w, h);
1124
1125         /* OK if right palette */
1126         if (gspca_dev->cam.cam_mode[mode].pixelformat
1127                                                 != fmt->fmt.pix.pixelformat) {
1128
1129                 /* else, search the closest mode with the same pixel format */
1130                 mode2 = gspca_get_mode(gspca_dev, mode,
1131                                         fmt->fmt.pix.pixelformat);
1132                 if (mode2 >= 0)
1133                         mode = mode2;
1134         }
1135         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1136         if (gspca_dev->sd_desc->try_fmt) {
1137                 /* pass original resolution to subdriver try_fmt */
1138                 fmt->fmt.pix.width = w;
1139                 fmt->fmt.pix.height = h;
1140                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1141         }
1142         /* some drivers use priv internally, zero it before giving it to
1143            userspace */
1144         fmt->fmt.pix.priv = 0;
1145         return mode;                    /* used when s_fmt */
1146 }
1147
1148 static int vidioc_try_fmt_vid_cap(struct file *file,
1149                               void *priv,
1150                               struct v4l2_format *fmt)
1151 {
1152         struct gspca_dev *gspca_dev = video_drvdata(file);
1153         int ret;
1154
1155         ret = try_fmt_vid_cap(gspca_dev, fmt);
1156         if (ret < 0)
1157                 return ret;
1158         return 0;
1159 }
1160
1161 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1162                             struct v4l2_format *fmt)
1163 {
1164         struct gspca_dev *gspca_dev = video_drvdata(file);
1165         int ret;
1166
1167         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1168                 return -ERESTARTSYS;
1169
1170         ret = try_fmt_vid_cap(gspca_dev, fmt);
1171         if (ret < 0)
1172                 goto out;
1173
1174         if (gspca_dev->nframes != 0
1175             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1176                 ret = -EINVAL;
1177                 goto out;
1178         }
1179
1180         if (gspca_dev->streaming) {
1181                 ret = -EBUSY;
1182                 goto out;
1183         }
1184         gspca_dev->curr_mode = ret;
1185         if (gspca_dev->sd_desc->try_fmt)
1186                 /* subdriver try_fmt can modify format parameters */
1187                 gspca_dev->pixfmt = fmt->fmt.pix;
1188         else
1189                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1190
1191         ret = 0;
1192 out:
1193         mutex_unlock(&gspca_dev->queue_lock);
1194         return ret;
1195 }
1196
1197 static int vidioc_enum_framesizes(struct file *file, void *priv,
1198                                   struct v4l2_frmsizeenum *fsize)
1199 {
1200         struct gspca_dev *gspca_dev = video_drvdata(file);
1201         int i;
1202         __u32 index = 0;
1203
1204         if (gspca_dev->sd_desc->enum_framesizes)
1205                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1206
1207         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1208                 if (fsize->pixel_format !=
1209                                 gspca_dev->cam.cam_mode[i].pixelformat)
1210                         continue;
1211
1212                 if (fsize->index == index) {
1213                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1214                         fsize->discrete.width =
1215                                 gspca_dev->cam.cam_mode[i].width;
1216                         fsize->discrete.height =
1217                                 gspca_dev->cam.cam_mode[i].height;
1218                         return 0;
1219                 }
1220                 index++;
1221         }
1222
1223         return -EINVAL;
1224 }
1225
1226 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1227                                       struct v4l2_frmivalenum *fival)
1228 {
1229         struct gspca_dev *gspca_dev = video_drvdata(filp);
1230         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1231         __u32 i;
1232
1233         if (gspca_dev->cam.mode_framerates == NULL ||
1234                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1235                 return -EINVAL;
1236
1237         if (fival->pixel_format !=
1238                         gspca_dev->cam.cam_mode[mode].pixelformat)
1239                 return -EINVAL;
1240
1241         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1242                 if (fival->index == i) {
1243                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1244                         fival->discrete.numerator = 1;
1245                         fival->discrete.denominator =
1246                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1247                         return 0;
1248                 }
1249         }
1250
1251         return -EINVAL;
1252 }
1253
1254 static void gspca_release(struct v4l2_device *v4l2_device)
1255 {
1256         struct gspca_dev *gspca_dev =
1257                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1258
1259         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1260         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1261         kfree(gspca_dev->usb_buf);
1262         kfree(gspca_dev);
1263 }
1264
1265 static int dev_open(struct file *file)
1266 {
1267         struct gspca_dev *gspca_dev = video_drvdata(file);
1268         int ret;
1269
1270         PDEBUG(D_STREAM, "[%s] open", current->comm);
1271
1272         /* protect the subdriver against rmmod */
1273         if (!try_module_get(gspca_dev->module))
1274                 return -ENODEV;
1275
1276         ret = v4l2_fh_open(file);
1277         if (ret)
1278                 module_put(gspca_dev->module);
1279         return ret;
1280 }
1281
1282 static int dev_close(struct file *file)
1283 {
1284         struct gspca_dev *gspca_dev = video_drvdata(file);
1285
1286         PDEBUG(D_STREAM, "[%s] close", current->comm);
1287
1288         /* Needed for gspca_stream_off, always lock before queue_lock! */
1289         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1290                 return -ERESTARTSYS;
1291
1292         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1293                 mutex_unlock(&gspca_dev->usb_lock);
1294                 return -ERESTARTSYS;
1295         }
1296
1297         /* if the file did the capture, free the streaming resources */
1298         if (gspca_dev->capt_file == file) {
1299                 if (gspca_dev->streaming)
1300                         gspca_stream_off(gspca_dev);
1301                 frame_free(gspca_dev);
1302         }
1303         module_put(gspca_dev->module);
1304         mutex_unlock(&gspca_dev->queue_lock);
1305         mutex_unlock(&gspca_dev->usb_lock);
1306
1307         PDEBUG(D_STREAM, "close done");
1308
1309         return v4l2_fh_release(file);
1310 }
1311
1312 static int vidioc_querycap(struct file *file, void  *priv,
1313                            struct v4l2_capability *cap)
1314 {
1315         struct gspca_dev *gspca_dev = video_drvdata(file);
1316
1317         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1318                         sizeof cap->driver);
1319         if (gspca_dev->dev->product != NULL) {
1320                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1321                         sizeof cap->card);
1322         } else {
1323                 snprintf((char *) cap->card, sizeof cap->card,
1324                         "USB Camera (%04x:%04x)",
1325                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1326                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1327         }
1328         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1329                         sizeof(cap->bus_info));
1330         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1331                           | V4L2_CAP_STREAMING
1332                           | V4L2_CAP_READWRITE;
1333         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1334         return 0;
1335 }
1336
1337 static int vidioc_enum_input(struct file *file, void *priv,
1338                                 struct v4l2_input *input)
1339 {
1340         struct gspca_dev *gspca_dev = video_drvdata(file);
1341
1342         if (input->index != 0)
1343                 return -EINVAL;
1344         input->type = V4L2_INPUT_TYPE_CAMERA;
1345         input->status = gspca_dev->cam.input_flags;
1346         strlcpy(input->name, gspca_dev->sd_desc->name,
1347                 sizeof input->name);
1348         return 0;
1349 }
1350
1351 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1352 {
1353         *i = 0;
1354         return 0;
1355 }
1356
1357 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1358 {
1359         if (i > 0)
1360                 return -EINVAL;
1361         return (0);
1362 }
1363
1364 static int vidioc_reqbufs(struct file *file, void *priv,
1365                           struct v4l2_requestbuffers *rb)
1366 {
1367         struct gspca_dev *gspca_dev = video_drvdata(file);
1368         int i, ret = 0, streaming;
1369
1370         i = rb->memory;                 /* (avoid compilation warning) */
1371         switch (i) {
1372         case GSPCA_MEMORY_READ:                 /* (internal call) */
1373         case V4L2_MEMORY_MMAP:
1374         case V4L2_MEMORY_USERPTR:
1375                 break;
1376         default:
1377                 return -EINVAL;
1378         }
1379         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1380                 return -ERESTARTSYS;
1381
1382         if (gspca_dev->memory != GSPCA_MEMORY_NO
1383             && gspca_dev->memory != GSPCA_MEMORY_READ
1384             && gspca_dev->memory != rb->memory) {
1385                 ret = -EBUSY;
1386                 goto out;
1387         }
1388
1389         /* only one file may do the capture */
1390         if (gspca_dev->capt_file != NULL
1391             && gspca_dev->capt_file != file) {
1392                 ret = -EBUSY;
1393                 goto out;
1394         }
1395
1396         /* if allocated, the buffers must not be mapped */
1397         for (i = 0; i < gspca_dev->nframes; i++) {
1398                 if (gspca_dev->frame[i].vma_use_count) {
1399                         ret = -EBUSY;
1400                         goto out;
1401                 }
1402         }
1403
1404         /* stop streaming */
1405         streaming = gspca_dev->streaming;
1406         if (streaming) {
1407                 gspca_stream_off(gspca_dev);
1408
1409                 /* Don't restart the stream when switching from read
1410                  * to mmap mode */
1411                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1412                         streaming = 0;
1413         }
1414
1415         /* free the previous allocated buffers, if any */
1416         if (gspca_dev->nframes != 0)
1417                 frame_free(gspca_dev);
1418         if (rb->count == 0)                     /* unrequest */
1419                 goto out;
1420         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1421         if (ret == 0) {
1422                 rb->count = gspca_dev->nframes;
1423                 if (streaming)
1424                         ret = gspca_init_transfer(gspca_dev);
1425         }
1426 out:
1427         mutex_unlock(&gspca_dev->queue_lock);
1428         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1429         return ret;
1430 }
1431
1432 static int vidioc_querybuf(struct file *file, void *priv,
1433                            struct v4l2_buffer *v4l2_buf)
1434 {
1435         struct gspca_dev *gspca_dev = video_drvdata(file);
1436         struct gspca_frame *frame;
1437
1438         if (v4l2_buf->index >= gspca_dev->nframes)
1439                 return -EINVAL;
1440
1441         frame = &gspca_dev->frame[v4l2_buf->index];
1442         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1443         return 0;
1444 }
1445
1446 static int vidioc_streamon(struct file *file, void *priv,
1447                            enum v4l2_buf_type buf_type)
1448 {
1449         struct gspca_dev *gspca_dev = video_drvdata(file);
1450         int ret;
1451
1452         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1453                 return -EINVAL;
1454         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1455                 return -ERESTARTSYS;
1456
1457         /* check the capture file */
1458         if (gspca_dev->capt_file != file) {
1459                 ret = -EBUSY;
1460                 goto out;
1461         }
1462
1463         if (gspca_dev->nframes == 0
1464             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1465                 ret = -EINVAL;
1466                 goto out;
1467         }
1468         if (!gspca_dev->streaming) {
1469                 ret = gspca_init_transfer(gspca_dev);
1470                 if (ret < 0)
1471                         goto out;
1472         }
1473         PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1474                     gspca_dev->pixfmt.pixelformat,
1475                     gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1476         ret = 0;
1477 out:
1478         mutex_unlock(&gspca_dev->queue_lock);
1479         return ret;
1480 }
1481
1482 static int vidioc_streamoff(struct file *file, void *priv,
1483                                 enum v4l2_buf_type buf_type)
1484 {
1485         struct gspca_dev *gspca_dev = video_drvdata(file);
1486         int i, ret;
1487
1488         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1489                 return -EINVAL;
1490
1491         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1492                 return -ERESTARTSYS;
1493
1494         if (!gspca_dev->streaming) {
1495                 ret = 0;
1496                 goto out;
1497         }
1498
1499         /* check the capture file */
1500         if (gspca_dev->capt_file != file) {
1501                 ret = -EBUSY;
1502                 goto out;
1503         }
1504
1505         /* stop streaming */
1506         gspca_stream_off(gspca_dev);
1507         /* In case another thread is waiting in dqbuf */
1508         wake_up_interruptible(&gspca_dev->wq);
1509
1510         /* empty the transfer queues */
1511         for (i = 0; i < gspca_dev->nframes; i++)
1512                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1513         atomic_set(&gspca_dev->fr_q, 0);
1514         atomic_set(&gspca_dev->fr_i, 0);
1515         gspca_dev->fr_o = 0;
1516         ret = 0;
1517 out:
1518         mutex_unlock(&gspca_dev->queue_lock);
1519         return ret;
1520 }
1521
1522 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1523                         struct v4l2_jpegcompression *jpegcomp)
1524 {
1525         struct gspca_dev *gspca_dev = video_drvdata(file);
1526
1527         gspca_dev->usb_err = 0;
1528         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1529 }
1530
1531 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1532                         const struct v4l2_jpegcompression *jpegcomp)
1533 {
1534         struct gspca_dev *gspca_dev = video_drvdata(file);
1535
1536         gspca_dev->usb_err = 0;
1537         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1538 }
1539
1540 static int vidioc_g_parm(struct file *filp, void *priv,
1541                         struct v4l2_streamparm *parm)
1542 {
1543         struct gspca_dev *gspca_dev = video_drvdata(filp);
1544
1545         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1546
1547         if (gspca_dev->sd_desc->get_streamparm) {
1548                 gspca_dev->usb_err = 0;
1549                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1550                 return gspca_dev->usb_err;
1551         }
1552         return 0;
1553 }
1554
1555 static int vidioc_s_parm(struct file *filp, void *priv,
1556                         struct v4l2_streamparm *parm)
1557 {
1558         struct gspca_dev *gspca_dev = video_drvdata(filp);
1559         int n;
1560
1561         n = parm->parm.capture.readbuffers;
1562         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1563                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1564         else
1565                 gspca_dev->nbufread = n;
1566
1567         if (gspca_dev->sd_desc->set_streamparm) {
1568                 gspca_dev->usb_err = 0;
1569                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1570                 return gspca_dev->usb_err;
1571         }
1572
1573         return 0;
1574 }
1575
1576 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1577 {
1578         struct gspca_dev *gspca_dev = video_drvdata(file);
1579         struct gspca_frame *frame;
1580         struct page *page;
1581         unsigned long addr, start, size;
1582         int i, ret;
1583
1584         start = vma->vm_start;
1585         size = vma->vm_end - vma->vm_start;
1586         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1587
1588         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1589                 return -ERESTARTSYS;
1590         if (gspca_dev->capt_file != file) {
1591                 ret = -EINVAL;
1592                 goto out;
1593         }
1594
1595         frame = NULL;
1596         for (i = 0; i < gspca_dev->nframes; ++i) {
1597                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1598                         PDEBUG(D_STREAM, "mmap bad memory type");
1599                         break;
1600                 }
1601                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1602                                                 == vma->vm_pgoff) {
1603                         frame = &gspca_dev->frame[i];
1604                         break;
1605                 }
1606         }
1607         if (frame == NULL) {
1608                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1609                 ret = -EINVAL;
1610                 goto out;
1611         }
1612         if (size != frame->v4l2_buf.length) {
1613                 PDEBUG(D_STREAM, "mmap bad size");
1614                 ret = -EINVAL;
1615                 goto out;
1616         }
1617
1618         /*
1619          * - VM_IO marks the area as being a mmaped region for I/O to a
1620          *   device. It also prevents the region from being core dumped.
1621          */
1622         vma->vm_flags |= VM_IO;
1623
1624         addr = (unsigned long) frame->data;
1625         while (size > 0) {
1626                 page = vmalloc_to_page((void *) addr);
1627                 ret = vm_insert_page(vma, start, page);
1628                 if (ret < 0)
1629                         goto out;
1630                 start += PAGE_SIZE;
1631                 addr += PAGE_SIZE;
1632                 size -= PAGE_SIZE;
1633         }
1634
1635         vma->vm_ops = &gspca_vm_ops;
1636         vma->vm_private_data = frame;
1637         gspca_vm_open(vma);
1638         ret = 0;
1639 out:
1640         mutex_unlock(&gspca_dev->queue_lock);
1641         return ret;
1642 }
1643
1644 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1645                                 enum v4l2_memory memory)
1646 {
1647         if (!gspca_dev->present)
1648                 return -ENODEV;
1649         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1650                         !gspca_dev->streaming)
1651                 return -EINVAL;
1652
1653         /* check if a frame is ready */
1654         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1655 }
1656
1657 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1658                         enum v4l2_memory memory)
1659 {
1660         int ret;
1661
1662         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1663                 return -ERESTARTSYS;
1664         ret = frame_ready_nolock(gspca_dev, file, memory);
1665         mutex_unlock(&gspca_dev->queue_lock);
1666         return ret;
1667 }
1668
1669 /*
1670  * dequeue a video buffer
1671  *
1672  * If nonblock_ing is false, block until a buffer is available.
1673  */
1674 static int vidioc_dqbuf(struct file *file, void *priv,
1675                         struct v4l2_buffer *v4l2_buf)
1676 {
1677         struct gspca_dev *gspca_dev = video_drvdata(file);
1678         struct gspca_frame *frame;
1679         int i, j, ret;
1680
1681         PDEBUG(D_FRAM, "dqbuf");
1682
1683         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1684                 return -ERESTARTSYS;
1685
1686         for (;;) {
1687                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1688                 if (ret < 0)
1689                         goto out;
1690                 if (ret > 0)
1691                         break;
1692
1693                 mutex_unlock(&gspca_dev->queue_lock);
1694
1695                 if (file->f_flags & O_NONBLOCK)
1696                         return -EAGAIN;
1697
1698                 /* wait till a frame is ready */
1699                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1700                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1701                         msecs_to_jiffies(3000));
1702                 if (ret < 0)
1703                         return ret;
1704                 if (ret == 0)
1705                         return -EIO;
1706
1707                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1708                         return -ERESTARTSYS;
1709         }
1710
1711         i = gspca_dev->fr_o;
1712         j = gspca_dev->fr_queue[i];
1713         frame = &gspca_dev->frame[j];
1714
1715         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1716
1717         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1718         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1719         PDEBUG(D_FRAM, "dqbuf %d", j);
1720         ret = 0;
1721
1722         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1723                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1724                                  frame->data,
1725                                  frame->v4l2_buf.bytesused)) {
1726                         PERR("dqbuf cp to user failed");
1727                         ret = -EFAULT;
1728                 }
1729         }
1730 out:
1731         mutex_unlock(&gspca_dev->queue_lock);
1732
1733         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1734                 mutex_lock(&gspca_dev->usb_lock);
1735                 gspca_dev->usb_err = 0;
1736                 if (gspca_dev->present)
1737                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1738                 mutex_unlock(&gspca_dev->usb_lock);
1739         }
1740
1741         return ret;
1742 }
1743
1744 /*
1745  * queue a video buffer
1746  *
1747  * Attempting to queue a buffer that has already been
1748  * queued will return -EINVAL.
1749  */
1750 static int vidioc_qbuf(struct file *file, void *priv,
1751                         struct v4l2_buffer *v4l2_buf)
1752 {
1753         struct gspca_dev *gspca_dev = video_drvdata(file);
1754         struct gspca_frame *frame;
1755         int i, index, ret;
1756
1757         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1758
1759         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1760                 return -ERESTARTSYS;
1761
1762         index = v4l2_buf->index;
1763         if ((unsigned) index >= gspca_dev->nframes) {
1764                 PDEBUG(D_FRAM,
1765                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1766                 ret = -EINVAL;
1767                 goto out;
1768         }
1769         if (v4l2_buf->memory != gspca_dev->memory) {
1770                 PDEBUG(D_FRAM, "qbuf bad memory type");
1771                 ret = -EINVAL;
1772                 goto out;
1773         }
1774
1775         frame = &gspca_dev->frame[index];
1776         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1777                 PDEBUG(D_FRAM, "qbuf bad state");
1778                 ret = -EINVAL;
1779                 goto out;
1780         }
1781
1782         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1783
1784         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1785                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1786                 frame->v4l2_buf.length = v4l2_buf->length;
1787         }
1788
1789         /* put the buffer in the 'queued' queue */
1790         i = atomic_read(&gspca_dev->fr_q);
1791         gspca_dev->fr_queue[i] = index;
1792         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1793
1794         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1795         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1796         ret = 0;
1797 out:
1798         mutex_unlock(&gspca_dev->queue_lock);
1799         return ret;
1800 }
1801
1802 /*
1803  * allocate the resources for read()
1804  */
1805 static int read_alloc(struct gspca_dev *gspca_dev,
1806                         struct file *file)
1807 {
1808         struct v4l2_buffer v4l2_buf;
1809         int i, ret;
1810
1811         PDEBUG(D_STREAM, "read alloc");
1812
1813         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1814                 return -ERESTARTSYS;
1815
1816         if (gspca_dev->nframes == 0) {
1817                 struct v4l2_requestbuffers rb;
1818
1819                 memset(&rb, 0, sizeof rb);
1820                 rb.count = gspca_dev->nbufread;
1821                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1822                 rb.memory = GSPCA_MEMORY_READ;
1823                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1824                 if (ret != 0) {
1825                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1826                         goto out;
1827                 }
1828                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1829                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1830                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1831                 for (i = 0; i < gspca_dev->nbufread; i++) {
1832                         v4l2_buf.index = i;
1833                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1834                         if (ret != 0) {
1835                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1836                                 goto out;
1837                         }
1838                 }
1839         }
1840
1841         /* start streaming */
1842         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1843         if (ret != 0)
1844                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1845 out:
1846         mutex_unlock(&gspca_dev->usb_lock);
1847         return ret;
1848 }
1849
1850 static unsigned int dev_poll(struct file *file, poll_table *wait)
1851 {
1852         struct gspca_dev *gspca_dev = video_drvdata(file);
1853         unsigned long req_events = poll_requested_events(wait);
1854         int ret = 0;
1855
1856         PDEBUG(D_FRAM, "poll");
1857
1858         if (req_events & POLLPRI)
1859                 ret |= v4l2_ctrl_poll(file, wait);
1860
1861         if (req_events & (POLLIN | POLLRDNORM)) {
1862                 /* if reqbufs is not done, the user would use read() */
1863                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1864                         if (read_alloc(gspca_dev, file) != 0) {
1865                                 ret |= POLLERR;
1866                                 goto out;
1867                         }
1868                 }
1869
1870                 poll_wait(file, &gspca_dev->wq, wait);
1871
1872                 /* check if an image has been received */
1873                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1874                         ret |= POLLERR;
1875                         goto out;
1876                 }
1877                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1878                         ret |= POLLIN | POLLRDNORM;
1879                 mutex_unlock(&gspca_dev->queue_lock);
1880         }
1881
1882 out:
1883         if (!gspca_dev->present)
1884                 ret |= POLLHUP;
1885
1886         return ret;
1887 }
1888
1889 static ssize_t dev_read(struct file *file, char __user *data,
1890                     size_t count, loff_t *ppos)
1891 {
1892         struct gspca_dev *gspca_dev = video_drvdata(file);
1893         struct gspca_frame *frame;
1894         struct v4l2_buffer v4l2_buf;
1895         struct timeval timestamp;
1896         int n, ret, ret2;
1897
1898         PDEBUG(D_FRAM, "read (%zd)", count);
1899         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1900                 ret = read_alloc(gspca_dev, file);
1901                 if (ret != 0)
1902                         return ret;
1903         }
1904
1905         /* get a frame */
1906         timestamp = ktime_to_timeval(ktime_get());
1907         timestamp.tv_sec--;
1908         n = 2;
1909         for (;;) {
1910                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1911                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1912                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1913                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1914                 if (ret != 0) {
1915                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1916                         return ret;
1917                 }
1918
1919                 /* if the process slept for more than 1 second,
1920                  * get a newer frame */
1921                 frame = &gspca_dev->frame[v4l2_buf.index];
1922                 if (--n < 0)
1923                         break;                  /* avoid infinite loop */
1924                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1925                         break;
1926                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1927                 if (ret != 0) {
1928                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1929                         return ret;
1930                 }
1931         }
1932
1933         /* copy the frame */
1934         if (count > frame->v4l2_buf.bytesused)
1935                 count = frame->v4l2_buf.bytesused;
1936         ret = copy_to_user(data, frame->data, count);
1937         if (ret != 0) {
1938                 PERR("read cp to user lack %d / %zd", ret, count);
1939                 ret = -EFAULT;
1940                 goto out;
1941         }
1942         ret = count;
1943 out:
1944         /* in each case, requeue the buffer */
1945         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1946         if (ret2 != 0)
1947                 return ret2;
1948         return ret;
1949 }
1950
1951 static struct v4l2_file_operations dev_fops = {
1952         .owner = THIS_MODULE,
1953         .open = dev_open,
1954         .release = dev_close,
1955         .read = dev_read,
1956         .mmap = dev_mmap,
1957         .unlocked_ioctl = video_ioctl2,
1958         .poll   = dev_poll,
1959 };
1960
1961 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1962         .vidioc_querycap        = vidioc_querycap,
1963         .vidioc_dqbuf           = vidioc_dqbuf,
1964         .vidioc_qbuf            = vidioc_qbuf,
1965         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1966         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1967         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1968         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1969         .vidioc_streamon        = vidioc_streamon,
1970         .vidioc_enum_input      = vidioc_enum_input,
1971         .vidioc_g_input         = vidioc_g_input,
1972         .vidioc_s_input         = vidioc_s_input,
1973         .vidioc_reqbufs         = vidioc_reqbufs,
1974         .vidioc_querybuf        = vidioc_querybuf,
1975         .vidioc_streamoff       = vidioc_streamoff,
1976         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1977         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1978         .vidioc_g_parm          = vidioc_g_parm,
1979         .vidioc_s_parm          = vidioc_s_parm,
1980         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1981         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1982 #ifdef CONFIG_VIDEO_ADV_DEBUG
1983         .vidioc_g_chip_info     = vidioc_g_chip_info,
1984         .vidioc_g_register      = vidioc_g_register,
1985         .vidioc_s_register      = vidioc_s_register,
1986 #endif
1987         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1988         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1989 };
1990
1991 static const struct video_device gspca_template = {
1992         .name = "gspca main driver",
1993         .fops = &dev_fops,
1994         .ioctl_ops = &dev_ioctl_ops,
1995         .release = video_device_release_empty, /* We use v4l2_dev.release */
1996 };
1997
1998 /*
1999  * probe and create a new gspca device
2000  *
2001  * This function must be called by the sub-driver when it is
2002  * called for probing a new device.
2003  */
2004 int gspca_dev_probe2(struct usb_interface *intf,
2005                 const struct usb_device_id *id,
2006                 const struct sd_desc *sd_desc,
2007                 int dev_size,
2008                 struct module *module)
2009 {
2010         struct gspca_dev *gspca_dev;
2011         struct usb_device *dev = interface_to_usbdev(intf);
2012         int ret;
2013
2014         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2015                 sd_desc->name, id->idVendor, id->idProduct);
2016
2017         /* create the device */
2018         if (dev_size < sizeof *gspca_dev)
2019                 dev_size = sizeof *gspca_dev;
2020         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2021         if (!gspca_dev) {
2022                 pr_err("couldn't kzalloc gspca struct\n");
2023                 return -ENOMEM;
2024         }
2025         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2026         if (!gspca_dev->usb_buf) {
2027                 pr_err("out of memory\n");
2028                 ret = -ENOMEM;
2029                 goto out;
2030         }
2031         gspca_dev->dev = dev;
2032         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2033
2034         /* check if any audio device */
2035         if (dev->actconfig->desc.bNumInterfaces != 1) {
2036                 int i;
2037                 struct usb_interface *intf2;
2038
2039                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2040                         intf2 = dev->actconfig->interface[i];
2041                         if (intf2 != NULL
2042                          && intf2->altsetting != NULL
2043                          && intf2->altsetting->desc.bInterfaceClass ==
2044                                          USB_CLASS_AUDIO) {
2045                                 gspca_dev->audio = 1;
2046                                 break;
2047                         }
2048                 }
2049         }
2050
2051         gspca_dev->v4l2_dev.release = gspca_release;
2052         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2053         if (ret)
2054                 goto out;
2055         gspca_dev->sd_desc = sd_desc;
2056         gspca_dev->nbufread = 2;
2057         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2058         gspca_dev->vdev = gspca_template;
2059         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2060         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2061         set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2062         gspca_dev->module = module;
2063         gspca_dev->present = 1;
2064
2065         mutex_init(&gspca_dev->usb_lock);
2066         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2067         mutex_init(&gspca_dev->queue_lock);
2068         init_waitqueue_head(&gspca_dev->wq);
2069
2070         /* configure the subdriver and initialize the USB device */
2071         ret = sd_desc->config(gspca_dev, id);
2072         if (ret < 0)
2073                 goto out;
2074         ret = sd_desc->init(gspca_dev);
2075         if (ret < 0)
2076                 goto out;
2077         if (sd_desc->init_controls)
2078                 ret = sd_desc->init_controls(gspca_dev);
2079         if (ret < 0)
2080                 goto out;
2081         gspca_set_default_mode(gspca_dev);
2082
2083         ret = gspca_input_connect(gspca_dev);
2084         if (ret)
2085                 goto out;
2086
2087         /*
2088          * Don't take usb_lock for these ioctls. This improves latency if
2089          * usb_lock is taken for a long time, e.g. when changing a control
2090          * value, and a new frame is ready to be dequeued.
2091          */
2092         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2093         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2094         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2095 #ifdef CONFIG_VIDEO_ADV_DEBUG
2096         if (!gspca_dev->sd_desc->get_register)
2097                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2098         if (!gspca_dev->sd_desc->set_register)
2099                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2100 #endif
2101         if (!gspca_dev->sd_desc->get_jcomp)
2102                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2103         if (!gspca_dev->sd_desc->set_jcomp)
2104                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2105
2106         /* init video stuff */
2107         ret = video_register_device(&gspca_dev->vdev,
2108                                   VFL_TYPE_GRABBER,
2109                                   -1);
2110         if (ret < 0) {
2111                 pr_err("video_register_device err %d\n", ret);
2112                 goto out;
2113         }
2114
2115         usb_set_intfdata(intf, gspca_dev);
2116         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2117
2118         gspca_input_create_urb(gspca_dev);
2119
2120         return 0;
2121 out:
2122 #if IS_ENABLED(CONFIG_INPUT)
2123         if (gspca_dev->input_dev)
2124                 input_unregister_device(gspca_dev->input_dev);
2125 #endif
2126         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2127         kfree(gspca_dev->usb_buf);
2128         kfree(gspca_dev);
2129         return ret;
2130 }
2131 EXPORT_SYMBOL(gspca_dev_probe2);
2132
2133 /* same function as the previous one, but check the interface */
2134 int gspca_dev_probe(struct usb_interface *intf,
2135                 const struct usb_device_id *id,
2136                 const struct sd_desc *sd_desc,
2137                 int dev_size,
2138                 struct module *module)
2139 {
2140         struct usb_device *dev = interface_to_usbdev(intf);
2141
2142         /* we don't handle multi-config cameras */
2143         if (dev->descriptor.bNumConfigurations != 1) {
2144                 pr_err("%04x:%04x too many config\n",
2145                        id->idVendor, id->idProduct);
2146                 return -ENODEV;
2147         }
2148
2149         /* the USB video interface must be the first one */
2150         if (dev->actconfig->desc.bNumInterfaces != 1
2151          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2152                 return -ENODEV;
2153
2154         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2155 }
2156 EXPORT_SYMBOL(gspca_dev_probe);
2157
2158 /*
2159  * USB disconnection
2160  *
2161  * This function must be called by the sub-driver
2162  * when the device disconnects, after the specific resources are freed.
2163  */
2164 void gspca_disconnect(struct usb_interface *intf)
2165 {
2166         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2167 #if IS_ENABLED(CONFIG_INPUT)
2168         struct input_dev *input_dev;
2169 #endif
2170
2171         PDEBUG(D_PROBE, "%s disconnect",
2172                 video_device_node_name(&gspca_dev->vdev));
2173
2174         mutex_lock(&gspca_dev->usb_lock);
2175
2176         gspca_dev->present = 0;
2177         destroy_urbs(gspca_dev);
2178
2179 #if IS_ENABLED(CONFIG_INPUT)
2180         gspca_input_destroy_urb(gspca_dev);
2181         input_dev = gspca_dev->input_dev;
2182         if (input_dev) {
2183                 gspca_dev->input_dev = NULL;
2184                 input_unregister_device(input_dev);
2185         }
2186 #endif
2187         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2188         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2189                 gspca_dev->sd_desc->stop0(gspca_dev);
2190         gspca_dev->streaming = 0;
2191         gspca_dev->dev = NULL;
2192         wake_up_interruptible(&gspca_dev->wq);
2193
2194         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2195         video_unregister_device(&gspca_dev->vdev);
2196
2197         mutex_unlock(&gspca_dev->usb_lock);
2198
2199         /* (this will call gspca_release() immediately or on last close) */
2200         v4l2_device_put(&gspca_dev->v4l2_dev);
2201 }
2202 EXPORT_SYMBOL(gspca_disconnect);
2203
2204 #ifdef CONFIG_PM
2205 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2206 {
2207         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2208
2209         gspca_input_destroy_urb(gspca_dev);
2210
2211         if (!gspca_dev->streaming)
2212                 return 0;
2213
2214         mutex_lock(&gspca_dev->usb_lock);
2215         gspca_dev->frozen = 1;          /* avoid urb error messages */
2216         gspca_dev->usb_err = 0;
2217         if (gspca_dev->sd_desc->stopN)
2218                 gspca_dev->sd_desc->stopN(gspca_dev);
2219         destroy_urbs(gspca_dev);
2220         gspca_set_alt0(gspca_dev);
2221         if (gspca_dev->sd_desc->stop0)
2222                 gspca_dev->sd_desc->stop0(gspca_dev);
2223         mutex_unlock(&gspca_dev->usb_lock);
2224
2225         return 0;
2226 }
2227 EXPORT_SYMBOL(gspca_suspend);
2228
2229 int gspca_resume(struct usb_interface *intf)
2230 {
2231         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2232         int streaming, ret = 0;
2233
2234         mutex_lock(&gspca_dev->usb_lock);
2235         gspca_dev->frozen = 0;
2236         gspca_dev->usb_err = 0;
2237         gspca_dev->sd_desc->init(gspca_dev);
2238         /*
2239          * Most subdrivers send all ctrl values on sd_start and thus
2240          * only write to the device registers on s_ctrl when streaming ->
2241          * Clear streaming to avoid setting all ctrls twice.
2242          */
2243         streaming = gspca_dev->streaming;
2244         gspca_dev->streaming = 0;
2245         if (streaming)
2246                 ret = gspca_init_transfer(gspca_dev);
2247         else
2248                 gspca_input_create_urb(gspca_dev);
2249         mutex_unlock(&gspca_dev->usb_lock);
2250
2251         return ret;
2252 }
2253 EXPORT_SYMBOL(gspca_resume);
2254 #endif
2255
2256 /* -- module insert / remove -- */
2257 static int __init gspca_init(void)
2258 {
2259         pr_info("v" GSPCA_VERSION " registered\n");
2260         return 0;
2261 }
2262 static void __exit gspca_exit(void)
2263 {
2264 }
2265
2266 module_init(gspca_init);
2267 module_exit(gspca_exit);
2268
2269 module_param_named(debug, gspca_debug, int, 0644);
2270 MODULE_PARM_DESC(debug,
2271                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");