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         i = gspca_dev->curr_mode;
 508         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 509         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 510         frsz = PAGE_ALIGN(frsz);
 511         if (count >= GSPCA_MAX_FRAMES)
 512                 count = GSPCA_MAX_FRAMES - 1;
 513         gspca_dev->frbuf = vmalloc_32(frsz * count);
 514         if (!gspca_dev->frbuf) {
 515                 pr_err("frame alloc failed\n");
 516                 return -ENOMEM;
 517         }
 518         gspca_dev->capt_file = file;
 519         gspca_dev->memory = memory;
 520         gspca_dev->frsz = frsz;
 521         gspca_dev->nframes = count;
 522         for (i = 0; i < count; i++) {
 523                 frame = &gspca_dev->frame[i];
 524                 frame->v4l2_buf.index = i;
 525                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 526                 frame->v4l2_buf.flags = 0;
 527                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 528                 frame->v4l2_buf.length = frsz;
 529                 frame->v4l2_buf.memory = memory;
 530                 frame->v4l2_buf.sequence = 0;
 531                 frame->data = gspca_dev->frbuf + i * frsz;
 532                 frame->v4l2_buf.m.offset = i * frsz;
 533         }
 534         atomic_set(&gspca_dev->fr_q, 0);
 535         atomic_set(&gspca_dev->fr_i, 0);
 536         gspca_dev->fr_o = 0;
 537         return 0;
 538 }
 539
 540 static void frame_free(struct gspca_dev *gspca_dev)
 541 {
 542         int i;
 543
 544         PDEBUG(D_STREAM, "frame free");
 545         if (gspca_dev->frbuf != NULL) {
 546                 vfree(gspca_dev->frbuf);
 547                 gspca_dev->frbuf = NULL;
 548                 for (i = 0; i < gspca_dev->nframes; i++)
 549                         gspca_dev->frame[i].data = NULL;
 550         }
 551         gspca_dev->nframes = 0;
 552         gspca_dev->frsz = 0;
 553         gspca_dev->capt_file = NULL;
 554         gspca_dev->memory = GSPCA_MEMORY_NO;
 555 }
 556
 557 static void destroy_urbs(struct gspca_dev *gspca_dev)
 558 {
 559         struct urb *urb;
 560         unsigned int i;
 561
 562         PDEBUG(D_STREAM, "kill transfer");
 563         for (i = 0; i < MAX_NURBS; i++) {
 564                 urb = gspca_dev->urb[i];
 565                 if (urb == NULL)
 566                         break;
 567
 568                 gspca_dev->urb[i] = NULL;
 569                 usb_kill_urb(urb);
 570                 usb_free_coherent(gspca_dev->dev,
 571                                   urb->transfer_buffer_length,
 572                                   urb->transfer_buffer,
 573                                   urb->transfer_dma);
 574                 usb_free_urb(urb);
 575         }
 576 }
 577
 578 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 579 {
 580         int ret;
 581
 582         if (gspca_dev->alt == 0)
 583                 return 0;
 584         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 585         if (ret < 0)
 586                 pr_err("set alt 0 err %d\n", ret);
 587         return ret;
 588 }
 589
 590 /* Note: both the queue and the usb locks should be held when calling this */
 591 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 592 {
 593         gspca_dev->streaming = 0;
 594         gspca_dev->usb_err = 0;
 595         if (gspca_dev->sd_desc->stopN)
 596                 gspca_dev->sd_desc->stopN(gspca_dev);
 597         destroy_urbs(gspca_dev);
 598         gspca_input_destroy_urb(gspca_dev);
 599         gspca_set_alt0(gspca_dev);
 600         gspca_input_create_urb(gspca_dev);
 601         if (gspca_dev->sd_desc->stop0)
 602                 gspca_dev->sd_desc->stop0(gspca_dev);
 603         PDEBUG(D_STREAM, "stream off OK");
 604 }
 605
 606 /*
 607  * look for an input transfer endpoint in an alternate setting
 608  */
 609 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 610                                           int xfer)
 611 {
 612         struct usb_host_endpoint *ep;
 613         int i, attr;
 614
 615         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 616                 ep = &alt->endpoint[i];
 617                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 618                 if (attr == xfer
 619                     && ep->desc.wMaxPacketSize != 0
 620                     && usb_endpoint_dir_in(&ep->desc))
 621                         return ep;
 622         }
 623         return NULL;
 624 }
 625
 626 /* compute the minimum bandwidth for the current transfer */
 627 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 628 {
 629         u32 bandwidth;
 630         int i;
 631
 632         /* get the (max) image size */
 633         i = gspca_dev->curr_mode;
 634         bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
 635
 636         /* if the image is compressed, estimate its mean size */
 637         if (!gspca_dev->cam.needs_full_bandwidth &&
 638             bandwidth < gspca_dev->cam.cam_mode[i].width *
 639                                 gspca_dev->cam.cam_mode[i].height)
 640                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 641
 642         /* estimate the frame rate */
 643         if (gspca_dev->sd_desc->get_streamparm) {
 644                 struct v4l2_streamparm parm;
 645
 646                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 647                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 648                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 649         } else {
 650
 651                 /* don't hope more than 15 fps with USB 1.1 and
 652                  * image resolution >= 640x480 */
 653                 if (gspca_dev->width >= 640
 654                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 655                         bandwidth *= 15;                /* 15 fps */
 656                 else
 657                         bandwidth *= 30;                /* 30 fps */
 658         }
 659
 660         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 661         return bandwidth;
 662 }
 663
 664 /* endpoint table */
 665 #define MAX_ALT 16
 666 struct ep_tb_s {
 667         u32 alt;
 668         u32 bandwidth;
 669 };
 670
 671 /*
 672  * build the table of the endpoints
 673  * and compute the minimum bandwidth for the image transfer
 674  */
 675 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 676                         struct usb_interface *intf,
 677                         struct ep_tb_s *ep_tb)
 678 {
 679         struct usb_host_endpoint *ep;
 680         int i, j, nbalt, psize, found;
 681         u32 bandwidth, last_bw;
 682
 683         nbalt = intf->num_altsetting;
 684         if (nbalt > MAX_ALT)
 685                 nbalt = MAX_ALT;        /* fixme: should warn */
 686
 687         /* build the endpoint table */
 688         i = 0;
 689         last_bw = 0;
 690         for (;;) {
 691                 ep_tb->bandwidth = 2000 * 2000 * 120;
 692                 found = 0;
 693                 for (j = 0; j < nbalt; j++) {
 694                         ep = alt_xfer(&intf->altsetting[j],
 695                                       USB_ENDPOINT_XFER_ISOC);
 696                         if (ep == NULL)
 697                                 continue;
 698                         if (ep->desc.bInterval == 0) {
 699                                 pr_err("alt %d iso endp with 0 interval\n", j);
 700                                 continue;
 701                         }
 702                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 703                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 704                         bandwidth = psize * 1000;
 705                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 706                          || gspca_dev->dev->speed == USB_SPEED_SUPER)
 707                                 bandwidth *= 8;
 708                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 709                         if (bandwidth <= last_bw)
 710                                 continue;
 711                         if (bandwidth < ep_tb->bandwidth) {
 712                                 ep_tb->bandwidth = bandwidth;
 713                                 ep_tb->alt = j;
 714                                 found = 1;
 715                         }
 716                 }
 717                 if (!found)
 718                         break;
 719                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 720                                 ep_tb->alt, ep_tb->bandwidth);
 721                 last_bw = ep_tb->bandwidth;
 722                 i++;
 723                 ep_tb++;
 724         }
 725
 726         /*
 727          * If the camera:
 728          * has a usb audio class interface (a built in usb mic); and
 729          * is a usb 1 full speed device; and
 730          * uses the max full speed iso bandwidth; and
 731          * and has more than 1 alt setting
 732          * then skip the highest alt setting to spare bandwidth for the mic
 733          */
 734         if (gspca_dev->audio &&
 735                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 736                         last_bw >= 1000000 &&
 737                         i > 1) {
 738                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 739                 i--;
 740                 ep_tb--;
 741         }
 742
 743         /* get the requested bandwidth and start at the highest atlsetting */
 744         bandwidth = which_bandwidth(gspca_dev);
 745         ep_tb--;
 746         while (i > 1) {
 747                 ep_tb--;
 748                 if (ep_tb->bandwidth < bandwidth)
 749                         break;
 750                 i--;
 751         }
 752         return i;
 753 }
 754
 755 /*
 756  * create the URBs for image transfer
 757  */
 758 static int create_urbs(struct gspca_dev *gspca_dev,
 759                         struct usb_host_endpoint *ep)
 760 {
 761         struct urb *urb;
 762         int n, nurbs, i, psize, npkt, bsize;
 763
 764         /* calculate the packet size and the number of packets */
 765         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 766
 767         if (!gspca_dev->cam.bulk) {             /* isoc */
 768
 769                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 770                 if (gspca_dev->pkt_size == 0)
 771                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 772                 else
 773                         psize = gspca_dev->pkt_size;
 774                 npkt = gspca_dev->cam.npkt;
 775                 if (npkt == 0)
 776                         npkt = 32;              /* default value */
 777                 bsize = psize * npkt;
 778                 PDEBUG(D_STREAM,
 779                         "isoc %d pkts size %d = bsize:%d",
 780                         npkt, psize, bsize);
 781                 nurbs = DEF_NURBS;
 782         } else {                                /* bulk */
 783                 npkt = 0;
 784                 bsize = gspca_dev->cam.bulk_size;
 785                 if (bsize == 0)
 786                         bsize = psize;
 787                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 788                 if (gspca_dev->cam.bulk_nurbs != 0)
 789                         nurbs = gspca_dev->cam.bulk_nurbs;
 790                 else
 791                         nurbs = 1;
 792         }
 793
 794         for (n = 0; n < nurbs; n++) {
 795                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 796                 if (!urb) {
 797                         pr_err("usb_alloc_urb failed\n");
 798                         return -ENOMEM;
 799                 }
 800                 gspca_dev->urb[n] = urb;
 801                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 802                                                 bsize,
 803                                                 GFP_KERNEL,
 804                                                 &urb->transfer_dma);
 805
 806                 if (urb->transfer_buffer == NULL) {
 807                         pr_err("usb_alloc_coherent failed\n");
 808                         return -ENOMEM;
 809                 }
 810                 urb->dev = gspca_dev->dev;
 811                 urb->context = gspca_dev;
 812                 urb->transfer_buffer_length = bsize;
 813                 if (npkt != 0) {                /* ISOC */
 814                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 815                                                     ep->desc.bEndpointAddress);
 816                         urb->transfer_flags = URB_ISO_ASAP
 817                                         | URB_NO_TRANSFER_DMA_MAP;
 818                         urb->interval = 1 << (ep->desc.bInterval - 1);
 819                         urb->complete = isoc_irq;
 820                         urb->number_of_packets = npkt;
 821                         for (i = 0; i < npkt; i++) {
 822                                 urb->iso_frame_desc[i].length = psize;
 823                                 urb->iso_frame_desc[i].offset = psize * i;
 824                         }
 825                 } else {                /* bulk */
 826                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 827                                                 ep->desc.bEndpointAddress);
 828                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 829                         urb->complete = bulk_irq;
 830                 }
 831         }
 832         return 0;
 833 }
 834
 835 /*
 836  * start the USB transfer
 837  */
 838 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 839 {
 840         struct usb_interface *intf;
 841         struct usb_host_endpoint *ep;
 842         struct urb *urb;
 843         struct ep_tb_s ep_tb[MAX_ALT];
 844         int n, ret, xfer, alt, alt_idx;
 845
 846         /* reset the streaming variables */
 847         gspca_dev->image = NULL;
 848         gspca_dev->image_len = 0;
 849         gspca_dev->last_packet_type = DISCARD_PACKET;
 850         gspca_dev->sequence = 0;
 851
 852         gspca_dev->usb_err = 0;
 853
 854         /* do the specific subdriver stuff before endpoint selection */
 855         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 856         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 857         if (gspca_dev->sd_desc->isoc_init) {
 858                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 859                 if (ret < 0)
 860                         return ret;
 861         }
 862         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 863                                    : USB_ENDPOINT_XFER_ISOC;
 864
 865         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 866         if (gspca_dev->alt != 0) {
 867                 gspca_dev->alt--;       /* (previous version compatibility) */
 868                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
 869                 if (ep == NULL) {
 870                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 871                         return -EIO;
 872                 }
 873                 ep_tb[0].alt = gspca_dev->alt;
 874                 alt_idx = 1;
 875         } else {
 876
 877         /* else, compute the minimum bandwidth
 878          * and build the endpoint table */
 879                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 880                 if (alt_idx <= 0) {
 881                         pr_err("no transfer endpoint found\n");
 882                         return -EIO;
 883                 }
 884         }
 885
 886         /* set the highest alternate setting and
 887          * loop until urb submit succeeds */
 888         gspca_input_destroy_urb(gspca_dev);
 889
 890         gspca_dev->alt = ep_tb[--alt_idx].alt;
 891         alt = -1;
 892         for (;;) {
 893                 if (alt != gspca_dev->alt) {
 894                         alt = gspca_dev->alt;
 895                         if (intf->num_altsetting > 1) {
 896                                 ret = usb_set_interface(gspca_dev->dev,
 897                                                         gspca_dev->iface,
 898                                                         alt);
 899                                 if (ret < 0) {
 900                                         if (ret == -ENOSPC)
 901                                                 goto retry; /*fixme: ugly*/
 902                                         pr_err("set alt %d err %d\n", alt, ret);
 903                                         goto out;
 904                                 }
 905                         }
 906                 }
 907                 if (!gspca_dev->cam.no_urb_create) {
 908                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 909                         ret = create_urbs(gspca_dev,
 910                                 alt_xfer(&intf->altsetting[alt], xfer));
 911                         if (ret < 0) {
 912                                 destroy_urbs(gspca_dev);
 913                                 goto out;
 914                         }
 915                 }
 916
 917                 /* clear the bulk endpoint */
 918                 if (gspca_dev->cam.bulk)
 919                         usb_clear_halt(gspca_dev->dev,
 920                                         gspca_dev->urb[0]->pipe);
 921
 922                 /* start the cam */
 923                 ret = gspca_dev->sd_desc->start(gspca_dev);
 924                 if (ret < 0) {
 925                         destroy_urbs(gspca_dev);
 926                         goto out;
 927                 }
 928                 gspca_dev->streaming = 1;
 929                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 930
 931                 /* some bulk transfers are started by the subdriver */
 932                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 933                         break;
 934
 935                 /* submit the URBs */
 936                 for (n = 0; n < MAX_NURBS; n++) {
 937                         urb = gspca_dev->urb[n];
 938                         if (urb == NULL)
 939                                 break;
 940                         ret = usb_submit_urb(urb, GFP_KERNEL);
 941                         if (ret < 0)
 942                                 break;
 943                 }
 944                 if (ret >= 0)
 945                         break;                  /* transfer is started */
 946
 947                 /* something when wrong
 948                  * stop the webcam and free the transfer resources */
 949                 gspca_stream_off(gspca_dev);
 950                 if (ret != -ENOSPC) {
 951                         pr_err("usb_submit_urb alt %d err %d\n",
 952                                gspca_dev->alt, ret);
 953                         goto out;
 954                 }
 955
 956                 /* the bandwidth is not wide enough
 957                  * negotiate or try a lower alternate setting */
 958 retry:
 959                 PERR("alt %d - bandwidth not wide enough, trying again", alt);
 960                 msleep(20);     /* wait for kill complete */
 961                 if (gspca_dev->sd_desc->isoc_nego) {
 962                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 963                         if (ret < 0)
 964                                 goto out;
 965                 } else {
 966                         if (alt_idx <= 0) {
 967                                 pr_err("no transfer endpoint found\n");
 968                                 ret = -EIO;
 969                                 goto out;
 970                         }
 971                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 972                 }
 973         }
 974 out:
 975         gspca_input_create_urb(gspca_dev);
 976         return ret;
 977 }
 978
 979 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 980 {
 981         int i;
 982
 983         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 984         gspca_dev->curr_mode = i;
 985         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 986         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 987         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 988
 989         /* does nothing if ctrl_handler == NULL */
 990         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 991 }
 992
 993 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 994                         int width, int height)
 995 {
 996         int i;
 997
 998         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 999                 if (width >= gspca_dev->cam.cam_mode[i].width
1000                     && height >= gspca_dev->cam.cam_mode[i].height)
1001                         break;
1002         }
1003         return i;
1004 }
1005
1006 /*
1007  * search a mode with the right pixel format
1008  */
1009 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1010                         int mode,
1011                         int pixfmt)
1012 {
1013         int modeU, modeD;
1014
1015         modeU = modeD = mode;
1016         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1017                 if (--modeD >= 0) {
1018                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1019                                                                 == pixfmt)
1020                                 return modeD;
1021                 }
1022                 if (++modeU < gspca_dev->cam.nmodes) {
1023                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1024                                                                 == pixfmt)
1025                                 return modeU;
1026                 }
1027         }
1028         return -EINVAL;
1029 }
1030
1031 #ifdef CONFIG_VIDEO_ADV_DEBUG
1032 static int vidioc_g_register(struct file *file, void *priv,
1033                         struct v4l2_dbg_register *reg)
1034 {
1035         struct gspca_dev *gspca_dev = video_drvdata(file);
1036
1037         gspca_dev->usb_err = 0;
1038         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1039 }
1040
1041 static int vidioc_s_register(struct file *file, void *priv,
1042                         const struct v4l2_dbg_register *reg)
1043 {
1044         struct gspca_dev *gspca_dev = video_drvdata(file);
1045
1046         gspca_dev->usb_err = 0;
1047         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1048 }
1049 #endif
1050
1051 static int vidioc_g_chip_ident(struct file *file, void *priv,
1052                         struct v4l2_dbg_chip_ident *chip)
1053 {
1054         struct gspca_dev *gspca_dev = video_drvdata(file);
1055
1056         gspca_dev->usb_err = 0;
1057         return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1058 }
1059
1060 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1061                                 struct v4l2_fmtdesc *fmtdesc)
1062 {
1063         struct gspca_dev *gspca_dev = video_drvdata(file);
1064         int i, j, index;
1065         __u32 fmt_tb[8];
1066
1067         /* give an index to each format */
1068         index = 0;
1069         j = 0;
1070         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1071                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1072                 j = 0;
1073                 for (;;) {
1074                         if (fmt_tb[j] == fmt_tb[index])
1075                                 break;
1076                         j++;
1077                 }
1078                 if (j == index) {
1079                         if (fmtdesc->index == index)
1080                                 break;          /* new format */
1081                         index++;
1082                         if (index >= ARRAY_SIZE(fmt_tb))
1083                                 return -EINVAL;
1084                 }
1085         }
1086         if (i < 0)
1087                 return -EINVAL;         /* no more format */
1088
1089         fmtdesc->pixelformat = fmt_tb[index];
1090         if (gspca_dev->cam.cam_mode[i].sizeimage <
1091                         gspca_dev->cam.cam_mode[i].width *
1092                                 gspca_dev->cam.cam_mode[i].height)
1093                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1094         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1095         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1096         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1097         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1098         fmtdesc->description[4] = '\0';
1099         return 0;
1100 }
1101
1102 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1103                             struct v4l2_format *fmt)
1104 {
1105         struct gspca_dev *gspca_dev = video_drvdata(file);
1106         int mode;
1107
1108         mode = gspca_dev->curr_mode;
1109         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1110         /* some drivers use priv internally, zero it before giving it to
1111            userspace */
1112         fmt->fmt.pix.priv = 0;
1113         return 0;
1114 }
1115
1116 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1117                         struct v4l2_format *fmt)
1118 {
1119         int w, h, mode, mode2;
1120
1121         w = fmt->fmt.pix.width;
1122         h = fmt->fmt.pix.height;
1123
1124         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1125                     fmt->fmt.pix.pixelformat, w, h);
1126
1127         /* search the closest mode for width and height */
1128         mode = wxh_to_mode(gspca_dev, w, h);
1129
1130         /* OK if right palette */
1131         if (gspca_dev->cam.cam_mode[mode].pixelformat
1132                                                 != fmt->fmt.pix.pixelformat) {
1133
1134                 /* else, search the closest mode with the same pixel format */
1135                 mode2 = gspca_get_mode(gspca_dev, mode,
1136                                         fmt->fmt.pix.pixelformat);
1137                 if (mode2 >= 0)
1138                         mode = mode2;
1139         }
1140         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1141         /* some drivers use priv internally, zero it before giving it to
1142            userspace */
1143         fmt->fmt.pix.priv = 0;
1144         return mode;                    /* used when s_fmt */
1145 }
1146
1147 static int vidioc_try_fmt_vid_cap(struct file *file,
1148                               void *priv,
1149                               struct v4l2_format *fmt)
1150 {
1151         struct gspca_dev *gspca_dev = video_drvdata(file);
1152         int ret;
1153
1154         ret = try_fmt_vid_cap(gspca_dev, fmt);
1155         if (ret < 0)
1156                 return ret;
1157         return 0;
1158 }
1159
1160 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1161                             struct v4l2_format *fmt)
1162 {
1163         struct gspca_dev *gspca_dev = video_drvdata(file);
1164         int ret;
1165
1166         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1167                 return -ERESTARTSYS;
1168
1169         ret = try_fmt_vid_cap(gspca_dev, fmt);
1170         if (ret < 0)
1171                 goto out;
1172
1173         if (gspca_dev->nframes != 0
1174             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1175                 ret = -EINVAL;
1176                 goto out;
1177         }
1178
1179         if (ret == gspca_dev->curr_mode) {
1180                 ret = 0;
1181                 goto out;                       /* same mode */
1182         }
1183
1184         if (gspca_dev->streaming) {
1185                 ret = -EBUSY;
1186                 goto out;
1187         }
1188         gspca_dev->width = fmt->fmt.pix.width;
1189         gspca_dev->height = fmt->fmt.pix.height;
1190         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1191         gspca_dev->curr_mode = ret;
1192
1193         ret = 0;
1194 out:
1195         mutex_unlock(&gspca_dev->queue_lock);
1196         return ret;
1197 }
1198
1199 static int vidioc_enum_framesizes(struct file *file, void *priv,
1200                                   struct v4l2_frmsizeenum *fsize)
1201 {
1202         struct gspca_dev *gspca_dev = video_drvdata(file);
1203         int i;
1204         __u32 index = 0;
1205
1206         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1207                 if (fsize->pixel_format !=
1208                                 gspca_dev->cam.cam_mode[i].pixelformat)
1209                         continue;
1210
1211                 if (fsize->index == index) {
1212                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1213                         fsize->discrete.width =
1214                                 gspca_dev->cam.cam_mode[i].width;
1215                         fsize->discrete.height =
1216                                 gspca_dev->cam.cam_mode[i].height;
1217                         return 0;
1218                 }
1219                 index++;
1220         }
1221
1222         return -EINVAL;
1223 }
1224
1225 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1226                                       struct v4l2_frmivalenum *fival)
1227 {
1228         struct gspca_dev *gspca_dev = video_drvdata(filp);
1229         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1230         __u32 i;
1231
1232         if (gspca_dev->cam.mode_framerates == NULL ||
1233                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1234                 return -EINVAL;
1235
1236         if (fival->pixel_format !=
1237                         gspca_dev->cam.cam_mode[mode].pixelformat)
1238                 return -EINVAL;
1239
1240         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1241                 if (fival->index == i) {
1242                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1243                         fival->discrete.numerator = 1;
1244                         fival->discrete.denominator =
1245                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1246                         return 0;
1247                 }
1248         }
1249
1250         return -EINVAL;
1251 }
1252
1253 static void gspca_release(struct v4l2_device *v4l2_device)
1254 {
1255         struct gspca_dev *gspca_dev =
1256                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1257
1258         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1259         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1260         kfree(gspca_dev->usb_buf);
1261         kfree(gspca_dev);
1262 }
1263
1264 static int dev_open(struct file *file)
1265 {
1266         struct gspca_dev *gspca_dev = video_drvdata(file);
1267
1268         PDEBUG(D_STREAM, "[%s] open", current->comm);
1269
1270         /* protect the subdriver against rmmod */
1271         if (!try_module_get(gspca_dev->module))
1272                 return -ENODEV;
1273
1274         return v4l2_fh_open(file);
1275 }
1276
1277 static int dev_close(struct file *file)
1278 {
1279         struct gspca_dev *gspca_dev = video_drvdata(file);
1280
1281         PDEBUG(D_STREAM, "[%s] close", current->comm);
1282
1283         /* Needed for gspca_stream_off, always lock before queue_lock! */
1284         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1285                 return -ERESTARTSYS;
1286
1287         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1288                 mutex_unlock(&gspca_dev->usb_lock);
1289                 return -ERESTARTSYS;
1290         }
1291
1292         /* if the file did the capture, free the streaming resources */
1293         if (gspca_dev->capt_file == file) {
1294                 if (gspca_dev->streaming)
1295                         gspca_stream_off(gspca_dev);
1296                 frame_free(gspca_dev);
1297         }
1298         module_put(gspca_dev->module);
1299         mutex_unlock(&gspca_dev->queue_lock);
1300         mutex_unlock(&gspca_dev->usb_lock);
1301
1302         PDEBUG(D_STREAM, "close done");
1303
1304         return v4l2_fh_release(file);
1305 }
1306
1307 static int vidioc_querycap(struct file *file, void  *priv,
1308                            struct v4l2_capability *cap)
1309 {
1310         struct gspca_dev *gspca_dev = video_drvdata(file);
1311
1312         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1313                         sizeof cap->driver);
1314         if (gspca_dev->dev->product != NULL) {
1315                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1316                         sizeof cap->card);
1317         } else {
1318                 snprintf((char *) cap->card, sizeof cap->card,
1319                         "USB Camera (%04x:%04x)",
1320                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1321                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1322         }
1323         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1324                         sizeof(cap->bus_info));
1325         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1326                           | V4L2_CAP_STREAMING
1327                           | V4L2_CAP_READWRITE;
1328         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1329         return 0;
1330 }
1331
1332 static int vidioc_enum_input(struct file *file, void *priv,
1333                                 struct v4l2_input *input)
1334 {
1335         struct gspca_dev *gspca_dev = video_drvdata(file);
1336
1337         if (input->index != 0)
1338                 return -EINVAL;
1339         input->type = V4L2_INPUT_TYPE_CAMERA;
1340         input->status = gspca_dev->cam.input_flags;
1341         strlcpy(input->name, gspca_dev->sd_desc->name,
1342                 sizeof input->name);
1343         return 0;
1344 }
1345
1346 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1347 {
1348         *i = 0;
1349         return 0;
1350 }
1351
1352 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1353 {
1354         if (i > 0)
1355                 return -EINVAL;
1356         return (0);
1357 }
1358
1359 static int vidioc_reqbufs(struct file *file, void *priv,
1360                           struct v4l2_requestbuffers *rb)
1361 {
1362         struct gspca_dev *gspca_dev = video_drvdata(file);
1363         int i, ret = 0, streaming;
1364
1365         i = rb->memory;                 /* (avoid compilation warning) */
1366         switch (i) {
1367         case GSPCA_MEMORY_READ:                 /* (internal call) */
1368         case V4L2_MEMORY_MMAP:
1369         case V4L2_MEMORY_USERPTR:
1370                 break;
1371         default:
1372                 return -EINVAL;
1373         }
1374         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1375                 return -ERESTARTSYS;
1376
1377         if (gspca_dev->memory != GSPCA_MEMORY_NO
1378             && gspca_dev->memory != GSPCA_MEMORY_READ
1379             && gspca_dev->memory != rb->memory) {
1380                 ret = -EBUSY;
1381                 goto out;
1382         }
1383
1384         /* only one file may do the capture */
1385         if (gspca_dev->capt_file != NULL
1386             && gspca_dev->capt_file != file) {
1387                 ret = -EBUSY;
1388                 goto out;
1389         }
1390
1391         /* if allocated, the buffers must not be mapped */
1392         for (i = 0; i < gspca_dev->nframes; i++) {
1393                 if (gspca_dev->frame[i].vma_use_count) {
1394                         ret = -EBUSY;
1395                         goto out;
1396                 }
1397         }
1398
1399         /* stop streaming */
1400         streaming = gspca_dev->streaming;
1401         if (streaming) {
1402                 gspca_stream_off(gspca_dev);
1403
1404                 /* Don't restart the stream when switching from read
1405                  * to mmap mode */
1406                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1407                         streaming = 0;
1408         }
1409
1410         /* free the previous allocated buffers, if any */
1411         if (gspca_dev->nframes != 0)
1412                 frame_free(gspca_dev);
1413         if (rb->count == 0)                     /* unrequest */
1414                 goto out;
1415         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1416         if (ret == 0) {
1417                 rb->count = gspca_dev->nframes;
1418                 if (streaming)
1419                         ret = gspca_init_transfer(gspca_dev);
1420         }
1421 out:
1422         mutex_unlock(&gspca_dev->queue_lock);
1423         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1424         return ret;
1425 }
1426
1427 static int vidioc_querybuf(struct file *file, void *priv,
1428                            struct v4l2_buffer *v4l2_buf)
1429 {
1430         struct gspca_dev *gspca_dev = video_drvdata(file);
1431         struct gspca_frame *frame;
1432
1433         if (v4l2_buf->index >= gspca_dev->nframes)
1434                 return -EINVAL;
1435
1436         frame = &gspca_dev->frame[v4l2_buf->index];
1437         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1438         return 0;
1439 }
1440
1441 static int vidioc_streamon(struct file *file, void *priv,
1442                            enum v4l2_buf_type buf_type)
1443 {
1444         struct gspca_dev *gspca_dev = video_drvdata(file);
1445         int ret;
1446
1447         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1448                 return -EINVAL;
1449         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1450                 return -ERESTARTSYS;
1451
1452         /* check the capture file */
1453         if (gspca_dev->capt_file != file) {
1454                 ret = -EBUSY;
1455                 goto out;
1456         }
1457
1458         if (gspca_dev->nframes == 0
1459             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1460                 ret = -EINVAL;
1461                 goto out;
1462         }
1463         if (!gspca_dev->streaming) {
1464                 ret = gspca_init_transfer(gspca_dev);
1465                 if (ret < 0)
1466                         goto out;
1467         }
1468         PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK", gspca_dev->pixfmt,
1469                     gspca_dev->width, gspca_dev->height);
1470         ret = 0;
1471 out:
1472         mutex_unlock(&gspca_dev->queue_lock);
1473         return ret;
1474 }
1475
1476 static int vidioc_streamoff(struct file *file, void *priv,
1477                                 enum v4l2_buf_type buf_type)
1478 {
1479         struct gspca_dev *gspca_dev = video_drvdata(file);
1480         int i, ret;
1481
1482         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1483                 return -EINVAL;
1484
1485         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1486                 return -ERESTARTSYS;
1487
1488         if (!gspca_dev->streaming) {
1489                 ret = 0;
1490                 goto out;
1491         }
1492
1493         /* check the capture file */
1494         if (gspca_dev->capt_file != file) {
1495                 ret = -EBUSY;
1496                 goto out;
1497         }
1498
1499         /* stop streaming */
1500         gspca_stream_off(gspca_dev);
1501         /* In case another thread is waiting in dqbuf */
1502         wake_up_interruptible(&gspca_dev->wq);
1503
1504         /* empty the transfer queues */
1505         for (i = 0; i < gspca_dev->nframes; i++)
1506                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1507         atomic_set(&gspca_dev->fr_q, 0);
1508         atomic_set(&gspca_dev->fr_i, 0);
1509         gspca_dev->fr_o = 0;
1510         ret = 0;
1511 out:
1512         mutex_unlock(&gspca_dev->queue_lock);
1513         return ret;
1514 }
1515
1516 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1517                         struct v4l2_jpegcompression *jpegcomp)
1518 {
1519         struct gspca_dev *gspca_dev = video_drvdata(file);
1520
1521         gspca_dev->usb_err = 0;
1522         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1523 }
1524
1525 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1526                         const struct v4l2_jpegcompression *jpegcomp)
1527 {
1528         struct gspca_dev *gspca_dev = video_drvdata(file);
1529
1530         gspca_dev->usb_err = 0;
1531         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1532 }
1533
1534 static int vidioc_g_parm(struct file *filp, void *priv,
1535                         struct v4l2_streamparm *parm)
1536 {
1537         struct gspca_dev *gspca_dev = video_drvdata(filp);
1538
1539         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1540
1541         if (gspca_dev->sd_desc->get_streamparm) {
1542                 gspca_dev->usb_err = 0;
1543                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1544                 return gspca_dev->usb_err;
1545         }
1546         return 0;
1547 }
1548
1549 static int vidioc_s_parm(struct file *filp, void *priv,
1550                         struct v4l2_streamparm *parm)
1551 {
1552         struct gspca_dev *gspca_dev = video_drvdata(filp);
1553         int n;
1554
1555         n = parm->parm.capture.readbuffers;
1556         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1557                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1558         else
1559                 gspca_dev->nbufread = n;
1560
1561         if (gspca_dev->sd_desc->set_streamparm) {
1562                 gspca_dev->usb_err = 0;
1563                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1564                 return gspca_dev->usb_err;
1565         }
1566
1567         return 0;
1568 }
1569
1570 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1571 {
1572         struct gspca_dev *gspca_dev = video_drvdata(file);
1573         struct gspca_frame *frame;
1574         struct page *page;
1575         unsigned long addr, start, size;
1576         int i, ret;
1577
1578         start = vma->vm_start;
1579         size = vma->vm_end - vma->vm_start;
1580         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1581
1582         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1583                 return -ERESTARTSYS;
1584         if (gspca_dev->capt_file != file) {
1585                 ret = -EINVAL;
1586                 goto out;
1587         }
1588
1589         frame = NULL;
1590         for (i = 0; i < gspca_dev->nframes; ++i) {
1591                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1592                         PDEBUG(D_STREAM, "mmap bad memory type");
1593                         break;
1594                 }
1595                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1596                                                 == vma->vm_pgoff) {
1597                         frame = &gspca_dev->frame[i];
1598                         break;
1599                 }
1600         }
1601         if (frame == NULL) {
1602                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1603                 ret = -EINVAL;
1604                 goto out;
1605         }
1606         if (size != frame->v4l2_buf.length) {
1607                 PDEBUG(D_STREAM, "mmap bad size");
1608                 ret = -EINVAL;
1609                 goto out;
1610         }
1611
1612         /*
1613          * - VM_IO marks the area as being a mmaped region for I/O to a
1614          *   device. It also prevents the region from being core dumped.
1615          */
1616         vma->vm_flags |= VM_IO;
1617
1618         addr = (unsigned long) frame->data;
1619         while (size > 0) {
1620                 page = vmalloc_to_page((void *) addr);
1621                 ret = vm_insert_page(vma, start, page);
1622                 if (ret < 0)
1623                         goto out;
1624                 start += PAGE_SIZE;
1625                 addr += PAGE_SIZE;
1626                 size -= PAGE_SIZE;
1627         }
1628
1629         vma->vm_ops = &gspca_vm_ops;
1630         vma->vm_private_data = frame;
1631         gspca_vm_open(vma);
1632         ret = 0;
1633 out:
1634         mutex_unlock(&gspca_dev->queue_lock);
1635         return ret;
1636 }
1637
1638 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1639                                 enum v4l2_memory memory)
1640 {
1641         if (!gspca_dev->present)
1642                 return -ENODEV;
1643         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1644                         !gspca_dev->streaming)
1645                 return -EINVAL;
1646
1647         /* check if a frame is ready */
1648         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1649 }
1650
1651 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1652                         enum v4l2_memory memory)
1653 {
1654         int ret;
1655
1656         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1657                 return -ERESTARTSYS;
1658         ret = frame_ready_nolock(gspca_dev, file, memory);
1659         mutex_unlock(&gspca_dev->queue_lock);
1660         return ret;
1661 }
1662
1663 /*
1664  * dequeue a video buffer
1665  *
1666  * If nonblock_ing is false, block until a buffer is available.
1667  */
1668 static int vidioc_dqbuf(struct file *file, void *priv,
1669                         struct v4l2_buffer *v4l2_buf)
1670 {
1671         struct gspca_dev *gspca_dev = video_drvdata(file);
1672         struct gspca_frame *frame;
1673         int i, j, ret;
1674
1675         PDEBUG(D_FRAM, "dqbuf");
1676
1677         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1678                 return -ERESTARTSYS;
1679
1680         for (;;) {
1681                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1682                 if (ret < 0)
1683                         goto out;
1684                 if (ret > 0)
1685                         break;
1686
1687                 mutex_unlock(&gspca_dev->queue_lock);
1688
1689                 if (file->f_flags & O_NONBLOCK)
1690                         return -EAGAIN;
1691
1692                 /* wait till a frame is ready */
1693                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1694                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1695                         msecs_to_jiffies(3000));
1696                 if (ret < 0)
1697                         return ret;
1698                 if (ret == 0)
1699                         return -EIO;
1700
1701                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1702                         return -ERESTARTSYS;
1703         }
1704
1705         i = gspca_dev->fr_o;
1706         j = gspca_dev->fr_queue[i];
1707         frame = &gspca_dev->frame[j];
1708
1709         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1710
1711         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1712         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1713         PDEBUG(D_FRAM, "dqbuf %d", j);
1714         ret = 0;
1715
1716         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1717                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1718                                  frame->data,
1719                                  frame->v4l2_buf.bytesused)) {
1720                         PERR("dqbuf cp to user failed");
1721                         ret = -EFAULT;
1722                 }
1723         }
1724 out:
1725         mutex_unlock(&gspca_dev->queue_lock);
1726
1727         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1728                 mutex_lock(&gspca_dev->usb_lock);
1729                 gspca_dev->usb_err = 0;
1730                 if (gspca_dev->present)
1731                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1732                 mutex_unlock(&gspca_dev->usb_lock);
1733         }
1734
1735         return ret;
1736 }
1737
1738 /*
1739  * queue a video buffer
1740  *
1741  * Attempting to queue a buffer that has already been
1742  * queued will return -EINVAL.
1743  */
1744 static int vidioc_qbuf(struct file *file, void *priv,
1745                         struct v4l2_buffer *v4l2_buf)
1746 {
1747         struct gspca_dev *gspca_dev = video_drvdata(file);
1748         struct gspca_frame *frame;
1749         int i, index, ret;
1750
1751         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1752
1753         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1754                 return -ERESTARTSYS;
1755
1756         index = v4l2_buf->index;
1757         if ((unsigned) index >= gspca_dev->nframes) {
1758                 PDEBUG(D_FRAM,
1759                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1760                 ret = -EINVAL;
1761                 goto out;
1762         }
1763         if (v4l2_buf->memory != gspca_dev->memory) {
1764                 PDEBUG(D_FRAM, "qbuf bad memory type");
1765                 ret = -EINVAL;
1766                 goto out;
1767         }
1768
1769         frame = &gspca_dev->frame[index];
1770         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1771                 PDEBUG(D_FRAM, "qbuf bad state");
1772                 ret = -EINVAL;
1773                 goto out;
1774         }
1775
1776         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1777
1778         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1779                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1780                 frame->v4l2_buf.length = v4l2_buf->length;
1781         }
1782
1783         /* put the buffer in the 'queued' queue */
1784         i = atomic_read(&gspca_dev->fr_q);
1785         gspca_dev->fr_queue[i] = index;
1786         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1787
1788         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1789         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1790         ret = 0;
1791 out:
1792         mutex_unlock(&gspca_dev->queue_lock);
1793         return ret;
1794 }
1795
1796 /*
1797  * allocate the resources for read()
1798  */
1799 static int read_alloc(struct gspca_dev *gspca_dev,
1800                         struct file *file)
1801 {
1802         struct v4l2_buffer v4l2_buf;
1803         int i, ret;
1804
1805         PDEBUG(D_STREAM, "read alloc");
1806
1807         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1808                 return -ERESTARTSYS;
1809
1810         if (gspca_dev->nframes == 0) {
1811                 struct v4l2_requestbuffers rb;
1812
1813                 memset(&rb, 0, sizeof rb);
1814                 rb.count = gspca_dev->nbufread;
1815                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1816                 rb.memory = GSPCA_MEMORY_READ;
1817                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1818                 if (ret != 0) {
1819                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1820                         goto out;
1821                 }
1822                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1823                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1824                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1825                 for (i = 0; i < gspca_dev->nbufread; i++) {
1826                         v4l2_buf.index = i;
1827                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1828                         if (ret != 0) {
1829                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1830                                 goto out;
1831                         }
1832                 }
1833         }
1834
1835         /* start streaming */
1836         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1837         if (ret != 0)
1838                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1839 out:
1840         mutex_unlock(&gspca_dev->usb_lock);
1841         return ret;
1842 }
1843
1844 static unsigned int dev_poll(struct file *file, poll_table *wait)
1845 {
1846         struct gspca_dev *gspca_dev = video_drvdata(file);
1847         unsigned long req_events = poll_requested_events(wait);
1848         int ret = 0;
1849
1850         PDEBUG(D_FRAM, "poll");
1851
1852         if (req_events & POLLPRI)
1853                 ret |= v4l2_ctrl_poll(file, wait);
1854
1855         if (req_events & (POLLIN | POLLRDNORM)) {
1856                 /* if reqbufs is not done, the user would use read() */
1857                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1858                         if (read_alloc(gspca_dev, file) != 0) {
1859                                 ret |= POLLERR;
1860                                 goto out;
1861                         }
1862                 }
1863
1864                 poll_wait(file, &gspca_dev->wq, wait);
1865
1866                 /* check if an image has been received */
1867                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1868                         ret |= POLLERR;
1869                         goto out;
1870                 }
1871                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1872                         ret |= POLLIN | POLLRDNORM;
1873                 mutex_unlock(&gspca_dev->queue_lock);
1874         }
1875
1876 out:
1877         if (!gspca_dev->present)
1878                 ret |= POLLHUP;
1879
1880         return ret;
1881 }
1882
1883 static ssize_t dev_read(struct file *file, char __user *data,
1884                     size_t count, loff_t *ppos)
1885 {
1886         struct gspca_dev *gspca_dev = video_drvdata(file);
1887         struct gspca_frame *frame;
1888         struct v4l2_buffer v4l2_buf;
1889         struct timeval timestamp;
1890         int n, ret, ret2;
1891
1892         PDEBUG(D_FRAM, "read (%zd)", count);
1893         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1894                 ret = read_alloc(gspca_dev, file);
1895                 if (ret != 0)
1896                         return ret;
1897         }
1898
1899         /* get a frame */
1900         timestamp = ktime_to_timeval(ktime_get());
1901         timestamp.tv_sec--;
1902         n = 2;
1903         for (;;) {
1904                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1905                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1906                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1907                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1908                 if (ret != 0) {
1909                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1910                         return ret;
1911                 }
1912
1913                 /* if the process slept for more than 1 second,
1914                  * get a newer frame */
1915                 frame = &gspca_dev->frame[v4l2_buf.index];
1916                 if (--n < 0)
1917                         break;                  /* avoid infinite loop */
1918                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1919                         break;
1920                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1921                 if (ret != 0) {
1922                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1923                         return ret;
1924                 }
1925         }
1926
1927         /* copy the frame */
1928         if (count > frame->v4l2_buf.bytesused)
1929                 count = frame->v4l2_buf.bytesused;
1930         ret = copy_to_user(data, frame->data, count);
1931         if (ret != 0) {
1932                 PERR("read cp to user lack %d / %zd", ret, count);
1933                 ret = -EFAULT;
1934                 goto out;
1935         }
1936         ret = count;
1937 out:
1938         /* in each case, requeue the buffer */
1939         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1940         if (ret2 != 0)
1941                 return ret2;
1942         return ret;
1943 }
1944
1945 static struct v4l2_file_operations dev_fops = {
1946         .owner = THIS_MODULE,
1947         .open = dev_open,
1948         .release = dev_close,
1949         .read = dev_read,
1950         .mmap = dev_mmap,
1951         .unlocked_ioctl = video_ioctl2,
1952         .poll   = dev_poll,
1953 };
1954
1955 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1956         .vidioc_querycap        = vidioc_querycap,
1957         .vidioc_dqbuf           = vidioc_dqbuf,
1958         .vidioc_qbuf            = vidioc_qbuf,
1959         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1960         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1961         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1962         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1963         .vidioc_streamon        = vidioc_streamon,
1964         .vidioc_enum_input      = vidioc_enum_input,
1965         .vidioc_g_input         = vidioc_g_input,
1966         .vidioc_s_input         = vidioc_s_input,
1967         .vidioc_reqbufs         = vidioc_reqbufs,
1968         .vidioc_querybuf        = vidioc_querybuf,
1969         .vidioc_streamoff       = vidioc_streamoff,
1970         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1971         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1972         .vidioc_g_parm          = vidioc_g_parm,
1973         .vidioc_s_parm          = vidioc_s_parm,
1974         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1975         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1976 #ifdef CONFIG_VIDEO_ADV_DEBUG
1977         .vidioc_g_register      = vidioc_g_register,
1978         .vidioc_s_register      = vidioc_s_register,
1979 #endif
1980         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
1981         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1982         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1983 };
1984
1985 static const struct video_device gspca_template = {
1986         .name = "gspca main driver",
1987         .fops = &dev_fops,
1988         .ioctl_ops = &dev_ioctl_ops,
1989         .release = video_device_release_empty, /* We use v4l2_dev.release */
1990 };
1991
1992 /*
1993  * probe and create a new gspca device
1994  *
1995  * This function must be called by the sub-driver when it is
1996  * called for probing a new device.
1997  */
1998 int gspca_dev_probe2(struct usb_interface *intf,
1999                 const struct usb_device_id *id,
2000                 const struct sd_desc *sd_desc,
2001                 int dev_size,
2002                 struct module *module)
2003 {
2004         struct gspca_dev *gspca_dev;
2005         struct usb_device *dev = interface_to_usbdev(intf);
2006         int ret;
2007
2008         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2009                 sd_desc->name, id->idVendor, id->idProduct);
2010
2011         /* create the device */
2012         if (dev_size < sizeof *gspca_dev)
2013                 dev_size = sizeof *gspca_dev;
2014         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2015         if (!gspca_dev) {
2016                 pr_err("couldn't kzalloc gspca struct\n");
2017                 return -ENOMEM;
2018         }
2019         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2020         if (!gspca_dev->usb_buf) {
2021                 pr_err("out of memory\n");
2022                 ret = -ENOMEM;
2023                 goto out;
2024         }
2025         gspca_dev->dev = dev;
2026         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2027
2028         /* check if any audio device */
2029         if (dev->actconfig->desc.bNumInterfaces != 1) {
2030                 int i;
2031                 struct usb_interface *intf2;
2032
2033                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2034                         intf2 = dev->actconfig->interface[i];
2035                         if (intf2 != NULL
2036                          && intf2->altsetting != NULL
2037                          && intf2->altsetting->desc.bInterfaceClass ==
2038                                          USB_CLASS_AUDIO) {
2039                                 gspca_dev->audio = 1;
2040                                 break;
2041                         }
2042                 }
2043         }
2044
2045         gspca_dev->v4l2_dev.release = gspca_release;
2046         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2047         if (ret)
2048                 goto out;
2049         gspca_dev->sd_desc = sd_desc;
2050         gspca_dev->nbufread = 2;
2051         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2052         gspca_dev->vdev = gspca_template;
2053         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2054         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2055         set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2056         gspca_dev->module = module;
2057         gspca_dev->present = 1;
2058
2059         mutex_init(&gspca_dev->usb_lock);
2060         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2061         mutex_init(&gspca_dev->queue_lock);
2062         init_waitqueue_head(&gspca_dev->wq);
2063
2064         /* configure the subdriver and initialize the USB device */
2065         ret = sd_desc->config(gspca_dev, id);
2066         if (ret < 0)
2067                 goto out;
2068         ret = sd_desc->init(gspca_dev);
2069         if (ret < 0)
2070                 goto out;
2071         if (sd_desc->init_controls)
2072                 ret = sd_desc->init_controls(gspca_dev);
2073         if (ret < 0)
2074                 goto out;
2075         gspca_set_default_mode(gspca_dev);
2076
2077         ret = gspca_input_connect(gspca_dev);
2078         if (ret)
2079                 goto out;
2080
2081         /*
2082          * Don't take usb_lock for these ioctls. This improves latency if
2083          * usb_lock is taken for a long time, e.g. when changing a control
2084          * value, and a new frame is ready to be dequeued.
2085          */
2086         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2087         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2088         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2089         if (!gspca_dev->sd_desc->get_chip_ident)
2090                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_CHIP_IDENT);
2091 #ifdef CONFIG_VIDEO_ADV_DEBUG
2092         if (!gspca_dev->sd_desc->get_chip_ident ||
2093             !gspca_dev->sd_desc->get_register)
2094                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2095         if (!gspca_dev->sd_desc->get_chip_ident ||
2096             !gspca_dev->sd_desc->set_register)
2097                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2098 #endif
2099         if (!gspca_dev->sd_desc->get_jcomp)
2100                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2101         if (!gspca_dev->sd_desc->set_jcomp)
2102                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2103
2104         /* init video stuff */
2105         ret = video_register_device(&gspca_dev->vdev,
2106                                   VFL_TYPE_GRABBER,
2107                                   -1);
2108         if (ret < 0) {
2109                 pr_err("video_register_device err %d\n", ret);
2110                 goto out;
2111         }
2112
2113         usb_set_intfdata(intf, gspca_dev);
2114         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2115
2116         gspca_input_create_urb(gspca_dev);
2117
2118         return 0;
2119 out:
2120 #if IS_ENABLED(CONFIG_INPUT)
2121         if (gspca_dev->input_dev)
2122                 input_unregister_device(gspca_dev->input_dev);
2123 #endif
2124         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2125         kfree(gspca_dev->usb_buf);
2126         kfree(gspca_dev);
2127         return ret;
2128 }
2129 EXPORT_SYMBOL(gspca_dev_probe2);
2130
2131 /* same function as the previous one, but check the interface */
2132 int gspca_dev_probe(struct usb_interface *intf,
2133                 const struct usb_device_id *id,
2134                 const struct sd_desc *sd_desc,
2135                 int dev_size,
2136                 struct module *module)
2137 {
2138         struct usb_device *dev = interface_to_usbdev(intf);
2139
2140         /* we don't handle multi-config cameras */
2141         if (dev->descriptor.bNumConfigurations != 1) {
2142                 pr_err("%04x:%04x too many config\n",
2143                        id->idVendor, id->idProduct);
2144                 return -ENODEV;
2145         }
2146
2147         /* the USB video interface must be the first one */
2148         if (dev->actconfig->desc.bNumInterfaces != 1
2149          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2150                 return -ENODEV;
2151
2152         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2153 }
2154 EXPORT_SYMBOL(gspca_dev_probe);
2155
2156 /*
2157  * USB disconnection
2158  *
2159  * This function must be called by the sub-driver
2160  * when the device disconnects, after the specific resources are freed.
2161  */
2162 void gspca_disconnect(struct usb_interface *intf)
2163 {
2164         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2165 #if IS_ENABLED(CONFIG_INPUT)
2166         struct input_dev *input_dev;
2167 #endif
2168
2169         PDEBUG(D_PROBE, "%s disconnect",
2170                 video_device_node_name(&gspca_dev->vdev));
2171
2172         mutex_lock(&gspca_dev->usb_lock);
2173
2174         gspca_dev->present = 0;
2175         destroy_urbs(gspca_dev);
2176
2177 #if IS_ENABLED(CONFIG_INPUT)
2178         gspca_input_destroy_urb(gspca_dev);
2179         input_dev = gspca_dev->input_dev;
2180         if (input_dev) {
2181                 gspca_dev->input_dev = NULL;
2182                 input_unregister_device(input_dev);
2183         }
2184 #endif
2185         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2186         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2187                 gspca_dev->sd_desc->stop0(gspca_dev);
2188         gspca_dev->streaming = 0;
2189         gspca_dev->dev = NULL;
2190         wake_up_interruptible(&gspca_dev->wq);
2191
2192         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2193         video_unregister_device(&gspca_dev->vdev);
2194
2195         mutex_unlock(&gspca_dev->usb_lock);
2196
2197         /* (this will call gspca_release() immediately or on last close) */
2198         v4l2_device_put(&gspca_dev->v4l2_dev);
2199 }
2200 EXPORT_SYMBOL(gspca_disconnect);
2201
2202 #ifdef CONFIG_PM
2203 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2204 {
2205         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2206
2207         gspca_input_destroy_urb(gspca_dev);
2208
2209         if (!gspca_dev->streaming)
2210                 return 0;
2211
2212         mutex_lock(&gspca_dev->usb_lock);
2213         gspca_dev->frozen = 1;          /* avoid urb error messages */
2214         gspca_dev->usb_err = 0;
2215         if (gspca_dev->sd_desc->stopN)
2216                 gspca_dev->sd_desc->stopN(gspca_dev);
2217         destroy_urbs(gspca_dev);
2218         gspca_set_alt0(gspca_dev);
2219         if (gspca_dev->sd_desc->stop0)
2220                 gspca_dev->sd_desc->stop0(gspca_dev);
2221         mutex_unlock(&gspca_dev->usb_lock);
2222
2223         return 0;
2224 }
2225 EXPORT_SYMBOL(gspca_suspend);
2226
2227 int gspca_resume(struct usb_interface *intf)
2228 {
2229         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2230         int streaming, ret = 0;
2231
2232         mutex_lock(&gspca_dev->usb_lock);
2233         gspca_dev->frozen = 0;
2234         gspca_dev->usb_err = 0;
2235         gspca_dev->sd_desc->init(gspca_dev);
2236         /*
2237          * Most subdrivers send all ctrl values on sd_start and thus
2238          * only write to the device registers on s_ctrl when streaming ->
2239          * Clear streaming to avoid setting all ctrls twice.
2240          */
2241         streaming = gspca_dev->streaming;
2242         gspca_dev->streaming = 0;
2243         if (streaming)
2244                 ret = gspca_init_transfer(gspca_dev);
2245         else
2246                 gspca_input_create_urb(gspca_dev);
2247         mutex_unlock(&gspca_dev->usb_lock);
2248
2249         return ret;
2250 }
2251 EXPORT_SYMBOL(gspca_resume);
2252 #endif
2253
2254 /* -- module insert / remove -- */
2255 static int __init gspca_init(void)
2256 {
2257         pr_info("v" GSPCA_VERSION " registered\n");
2258         return 0;
2259 }
2260 static void __exit gspca_exit(void)
2261 {
2262 }
2263
2264 module_init(gspca_init);
2265 module_exit(gspca_exit);
2266
2267 module_param_named(debug, gspca_debug, int, 0644);
2268 MODULE_PARM_DESC(debug,
2269                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");