drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/ktime.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 13, 0)
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         err("Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         err("Input device registration failed with error %i",
 181                                 err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, buffer_len,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PDEBUG(D_ERR, "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                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321                 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                         err("ISOC data error: [%d] len=%d, status=%d",
 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                 err("usb_submit_urb() ret %d", st);
 350 }
 351
 352 /*
 353  * ISOC message interrupt from the USB device
 354  *
 355  * Analyse each packet and call the subdriver for copy to the frame buffer.
 356  */
 357 static void isoc_irq(struct urb *urb)
 358 {
 359         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 360
 361         PDEBUG(D_PACK, "isoc irq");
 362         if (!gspca_dev->streaming)
 363                 return;
 364         fill_frame(gspca_dev, urb);
 365 }
 366
 367 /*
 368  * bulk message interrupt from the USB device
 369  */
 370 static void bulk_irq(struct urb *urb)
 371 {
 372         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 373         int st;
 374
 375         PDEBUG(D_PACK, "bulk irq");
 376         if (!gspca_dev->streaming)
 377                 return;
 378         switch (urb->status) {
 379         case 0:
 380                 break;
 381         case -ESHUTDOWN:
 382                 return;         /* disconnection */
 383         default:
 384 #ifdef CONFIG_PM
 385                 if (gspca_dev->frozen)
 386                         return;
 387 #endif
 388                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 389                 urb->status = 0;
 390                 goto resubmit;
 391         }
 392
 393         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 394         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 395                                 urb->transfer_buffer,
 396                                 urb->actual_length);
 397
 398 resubmit:
 399         /* resubmit the URB */
 400         if (gspca_dev->cam.bulk_nurbs != 0) {
 401                 st = usb_submit_urb(urb, GFP_ATOMIC);
 402                 if (st < 0)
 403                         err("usb_submit_urb() ret %d", st);
 404         }
 405 }
 406
 407 /*
 408  * add data to the current frame
 409  *
 410  * This function is called by the subdrivers at interrupt level.
 411  *
 412  * To build a frame, these ones must add
 413  *      - one FIRST_PACKET
 414  *      - 0 or many INTER_PACKETs
 415  *      - one LAST_PACKET
 416  * DISCARD_PACKET invalidates the whole frame.
 417  */
 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                         return;
 449                 case LAST_PACKET:
 450                         return;
 451                 }
 452         }
 453
 454         /* append the packet to the frame buffer */
 455         if (len > 0) {
 456                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 457                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 458                                 gspca_dev->image_len + len,
 459                                 gspca_dev->frsz);
 460                         packet_type = DISCARD_PACKET;
 461                 } else {
 462 /* !! image is NULL only when last pkt is LAST or DISCARD
 463                         if (gspca_dev->image == NULL) {
 464                                 err("gspca_frame_add() image == NULL");
 465                                 return;
 466                         }
 467  */
 468                         memcpy(gspca_dev->image + gspca_dev->image_len,
 469                                 data, len);
 470                         gspca_dev->image_len += len;
 471                 }
 472         }
 473         gspca_dev->last_packet_type = packet_type;
 474
 475         /* if last packet, invalidate packet concatenation until
 476          * next first packet, wake up the application and advance
 477          * in the queue */
 478         if (packet_type == LAST_PACKET) {
 479                 i = atomic_read(&gspca_dev->fr_i);
 480                 j = gspca_dev->fr_queue[i];
 481                 frame = &gspca_dev->frame[j];
 482                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 483                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 484                                          | V4L2_BUF_FLAG_DONE)
 485                                         & ~V4L2_BUF_FLAG_QUEUED;
 486                 i = (i + 1) % GSPCA_MAX_FRAMES;
 487                 atomic_set(&gspca_dev->fr_i, i);
 488                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 489                 PDEBUG(D_FRAM, "frame complete len:%d",
 490                         frame->v4l2_buf.bytesused);
 491                 gspca_dev->image = NULL;
 492                 gspca_dev->image_len = 0;
 493         }
 494 }
 495 EXPORT_SYMBOL(gspca_frame_add);
 496
 497 static int gspca_is_compressed(__u32 format)
 498 {
 499         switch (format) {
 500         case V4L2_PIX_FMT_MJPEG:
 501         case V4L2_PIX_FMT_JPEG:
 502         case V4L2_PIX_FMT_SPCA561:
 503         case V4L2_PIX_FMT_PAC207:
 504         case V4L2_PIX_FMT_MR97310A:
 505                 return 1;
 506         }
 507         return 0;
 508 }
 509
 510 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 511                         enum v4l2_memory memory, unsigned int count)
 512 {
 513         struct gspca_frame *frame;
 514         unsigned int frsz;
 515         int i;
 516
 517         i = gspca_dev->curr_mode;
 518         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 519         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 520         frsz = PAGE_ALIGN(frsz);
 521         if (count >= GSPCA_MAX_FRAMES)
 522                 count = GSPCA_MAX_FRAMES - 1;
 523         gspca_dev->frbuf = vmalloc_32(frsz * count);
 524         if (!gspca_dev->frbuf) {
 525                 err("frame alloc failed");
 526                 return -ENOMEM;
 527         }
 528         gspca_dev->capt_file = file;
 529         gspca_dev->memory = memory;
 530         gspca_dev->frsz = frsz;
 531         gspca_dev->nframes = count;
 532         for (i = 0; i < count; i++) {
 533                 frame = &gspca_dev->frame[i];
 534                 frame->v4l2_buf.index = i;
 535                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 536                 frame->v4l2_buf.flags = 0;
 537                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 538                 frame->v4l2_buf.length = frsz;
 539                 frame->v4l2_buf.memory = memory;
 540                 frame->v4l2_buf.sequence = 0;
 541                 frame->data = gspca_dev->frbuf + i * frsz;
 542                 frame->v4l2_buf.m.offset = i * frsz;
 543         }
 544         atomic_set(&gspca_dev->fr_q, 0);
 545         atomic_set(&gspca_dev->fr_i, 0);
 546         gspca_dev->fr_o = 0;
 547         return 0;
 548 }
 549
 550 static void frame_free(struct gspca_dev *gspca_dev)
 551 {
 552         int i;
 553
 554         PDEBUG(D_STREAM, "frame free");
 555         if (gspca_dev->frbuf != NULL) {
 556                 vfree(gspca_dev->frbuf);
 557                 gspca_dev->frbuf = NULL;
 558                 for (i = 0; i < gspca_dev->nframes; i++)
 559                         gspca_dev->frame[i].data = NULL;
 560         }
 561         gspca_dev->nframes = 0;
 562         gspca_dev->frsz = 0;
 563         gspca_dev->capt_file = NULL;
 564         gspca_dev->memory = GSPCA_MEMORY_NO;
 565 }
 566
 567 static void destroy_urbs(struct gspca_dev *gspca_dev)
 568 {
 569         struct urb *urb;
 570         unsigned int i;
 571
 572         PDEBUG(D_STREAM, "kill transfer");
 573         for (i = 0; i < MAX_NURBS; i++) {
 574                 urb = gspca_dev->urb[i];
 575                 if (urb == NULL)
 576                         break;
 577
 578                 gspca_dev->urb[i] = NULL;
 579                 usb_kill_urb(urb);
 580                 if (urb->transfer_buffer != NULL)
 581                         usb_free_coherent(gspca_dev->dev,
 582                                           urb->transfer_buffer_length,
 583                                           urb->transfer_buffer,
 584                                           urb->transfer_dma);
 585                 usb_free_urb(urb);
 586         }
 587 }
 588
 589 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 590 {
 591         int ret;
 592
 593         if (gspca_dev->alt == 0)
 594                 return 0;
 595         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 596         if (ret < 0)
 597                 err("set alt 0 err %d", ret);
 598         return ret;
 599 }
 600
 601 /* Note: both the queue and the usb locks should be held when calling this */
 602 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 603 {
 604         gspca_dev->streaming = 0;
 605         if (gspca_dev->present) {
 606                 if (gspca_dev->sd_desc->stopN)
 607                         gspca_dev->sd_desc->stopN(gspca_dev);
 608                 destroy_urbs(gspca_dev);
 609                 gspca_input_destroy_urb(gspca_dev);
 610                 gspca_set_alt0(gspca_dev);
 611                 gspca_input_create_urb(gspca_dev);
 612         }
 613
 614         /* always call stop0 to free the subdriver's resources */
 615         if (gspca_dev->sd_desc->stop0)
 616                 gspca_dev->sd_desc->stop0(gspca_dev);
 617         PDEBUG(D_STREAM, "stream off OK");
 618 }
 619
 620 /*
 621  * look for an input transfer endpoint in an alternate setting
 622  */
 623 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 624                                           int xfer)
 625 {
 626         struct usb_host_endpoint *ep;
 627         int i, attr;
 628
 629         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 630                 ep = &alt->endpoint[i];
 631                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 632                 if (attr == xfer
 633                     && ep->desc.wMaxPacketSize != 0
 634                     && usb_endpoint_dir_in(&ep->desc))
 635                         return ep;
 636         }
 637         return NULL;
 638 }
 639
 640 /*
 641  * look for an input (isoc or bulk) endpoint
 642  *
 643  * The endpoint is defined by the subdriver.
 644  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 645  * This routine may be called many times when the bandwidth is too small
 646  * (the bandwidth is checked on urb submit).
 647  */
 648 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 649 {
 650         struct usb_interface *intf;
 651         struct usb_host_endpoint *ep;
 652         int xfer, i, ret;
 653
 654         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 655         ep = NULL;
 656         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 657                                    : USB_ENDPOINT_XFER_ISOC;
 658         i = gspca_dev->alt;                     /* previous alt setting */
 659         if (gspca_dev->cam.reverse_alts) {
 660                 while (++i < gspca_dev->nbalt) {
 661                         ep = alt_xfer(&intf->altsetting[i], xfer);
 662                         if (ep)
 663                                 break;
 664                 }
 665         } else {
 666                 while (--i >= 0) {
 667                         ep = alt_xfer(&intf->altsetting[i], xfer);
 668                         if (ep)
 669                                 break;
 670                 }
 671         }
 672         if (ep == NULL) {
 673                 err("no transfer endpoint found");
 674                 return NULL;
 675         }
 676         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 677                         i, ep->desc.bEndpointAddress);
 678         gspca_dev->alt = i;             /* memorize the current alt setting */
 679         if (gspca_dev->nbalt > 1) {
 680                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 681                 if (ret < 0) {
 682                         err("set alt %d err %d", i, ret);
 683                         ep = NULL;
 684                 }
 685         }
 686         return ep;
 687 }
 688
 689 /*
 690  * create the URBs for image transfer
 691  */
 692 static int create_urbs(struct gspca_dev *gspca_dev,
 693                         struct usb_host_endpoint *ep)
 694 {
 695         struct urb *urb;
 696         int n, nurbs, i, psize, npkt, bsize;
 697
 698         /* calculate the packet size and the number of packets */
 699         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 700
 701         if (!gspca_dev->cam.bulk) {             /* isoc */
 702
 703                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 704                 if (gspca_dev->pkt_size == 0)
 705                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 706                 else
 707                         psize = gspca_dev->pkt_size;
 708                 npkt = gspca_dev->cam.npkt;
 709                 if (npkt == 0)
 710                         npkt = 32;              /* default value */
 711                 bsize = psize * npkt;
 712                 PDEBUG(D_STREAM,
 713                         "isoc %d pkts size %d = bsize:%d",
 714                         npkt, psize, bsize);
 715                 nurbs = DEF_NURBS;
 716         } else {                                /* bulk */
 717                 npkt = 0;
 718                 bsize = gspca_dev->cam.bulk_size;
 719                 if (bsize == 0)
 720                         bsize = psize;
 721                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 722                 if (gspca_dev->cam.bulk_nurbs != 0)
 723                         nurbs = gspca_dev->cam.bulk_nurbs;
 724                 else
 725                         nurbs = 1;
 726         }
 727
 728         for (n = 0; n < nurbs; n++) {
 729                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 730                 if (!urb) {
 731                         err("usb_alloc_urb failed");
 732                         return -ENOMEM;
 733                 }
 734                 gspca_dev->urb[n] = urb;
 735                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 736                                                 bsize,
 737                                                 GFP_KERNEL,
 738                                                 &urb->transfer_dma);
 739
 740                 if (urb->transfer_buffer == NULL) {
 741                         err("usb_alloc_coherent failed");
 742                         return -ENOMEM;
 743                 }
 744                 urb->dev = gspca_dev->dev;
 745                 urb->context = gspca_dev;
 746                 urb->transfer_buffer_length = bsize;
 747                 if (npkt != 0) {                /* ISOC */
 748                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 749                                                     ep->desc.bEndpointAddress);
 750                         urb->transfer_flags = URB_ISO_ASAP
 751                                         | URB_NO_TRANSFER_DMA_MAP;
 752                         urb->interval = ep->desc.bInterval;
 753                         urb->complete = isoc_irq;
 754                         urb->number_of_packets = npkt;
 755                         for (i = 0; i < npkt; i++) {
 756                                 urb->iso_frame_desc[i].length = psize;
 757                                 urb->iso_frame_desc[i].offset = psize * i;
 758                         }
 759                 } else {                /* bulk */
 760                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 761                                                 ep->desc.bEndpointAddress);
 762                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 763                         urb->complete = bulk_irq;
 764                 }
 765         }
 766         return 0;
 767 }
 768
 769 /*
 770  * start the USB transfer
 771  */
 772 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 773 {
 774         struct usb_host_endpoint *ep;
 775         struct urb *urb;
 776         int n, ret;
 777
 778         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 779                 return -ERESTARTSYS;
 780
 781         if (!gspca_dev->present) {
 782                 ret = -ENODEV;
 783                 goto unlock;
 784         }
 785
 786         /* reset the streaming variables */
 787         gspca_dev->image = NULL;
 788         gspca_dev->image_len = 0;
 789         gspca_dev->last_packet_type = DISCARD_PACKET;
 790         gspca_dev->sequence = 0;
 791
 792         gspca_dev->usb_err = 0;
 793
 794         /* set the higher alternate setting and
 795          * loop until urb submit succeeds */
 796         if (gspca_dev->cam.reverse_alts)
 797                 gspca_dev->alt = 0;
 798         else
 799                 gspca_dev->alt = gspca_dev->nbalt;
 800
 801         if (gspca_dev->sd_desc->isoc_init) {
 802                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 803                 if (ret < 0)
 804                         goto unlock;
 805         }
 806
 807         gspca_input_destroy_urb(gspca_dev);
 808         ep = get_ep(gspca_dev);
 809         if (ep == NULL) {
 810                 ret = -EIO;
 811                 goto out;
 812         }
 813         for (;;) {
 814                 if (!gspca_dev->cam.no_urb_create) {
 815                         PDEBUG(D_STREAM, "init transfer alt %d",
 816                                 gspca_dev->alt);
 817                         ret = create_urbs(gspca_dev, ep);
 818                         if (ret < 0) {
 819                                 destroy_urbs(gspca_dev);
 820                                 goto out;
 821                         }
 822                 }
 823
 824                 /* clear the bulk endpoint */
 825                 if (gspca_dev->cam.bulk)
 826                         usb_clear_halt(gspca_dev->dev,
 827                                         gspca_dev->urb[0]->pipe);
 828
 829                 /* start the cam */
 830                 ret = gspca_dev->sd_desc->start(gspca_dev);
 831                 if (ret < 0) {
 832                         destroy_urbs(gspca_dev);
 833                         goto out;
 834                 }
 835                 gspca_dev->streaming = 1;
 836
 837                 /* some bulk transfers are started by the subdriver */
 838                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 839                         break;
 840
 841                 /* submit the URBs */
 842                 for (n = 0; n < MAX_NURBS; n++) {
 843                         urb = gspca_dev->urb[n];
 844                         if (urb == NULL)
 845                                 break;
 846                         ret = usb_submit_urb(urb, GFP_KERNEL);
 847                         if (ret < 0)
 848                                 break;
 849                 }
 850                 if (ret >= 0)
 851                         break;
 852                 gspca_stream_off(gspca_dev);
 853                 if (ret != -ENOSPC) {
 854                         err("usb_submit_urb alt %d err %d",
 855                                 gspca_dev->alt, ret);
 856                         goto out;
 857                 }
 858
 859                 /* the bandwidth is not wide enough
 860                  * negotiate or try a lower alternate setting */
 861                 PDEBUG(D_ERR|D_STREAM,
 862                         "bandwidth not wide enough - trying again");
 863                 msleep(20);     /* wait for kill complete */
 864                 if (gspca_dev->sd_desc->isoc_nego) {
 865                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 866                         if (ret < 0)
 867                                 goto out;
 868                 } else {
 869                         ep = get_ep(gspca_dev);
 870                         if (ep == NULL) {
 871                                 ret = -EIO;
 872                                 goto out;
 873                         }
 874                 }
 875         }
 876 out:
 877         gspca_input_create_urb(gspca_dev);
 878 unlock:
 879         mutex_unlock(&gspca_dev->usb_lock);
 880         return ret;
 881 }
 882
 883 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 884 {
 885         struct gspca_ctrl *ctrl;
 886         int i;
 887
 888         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 889         gspca_dev->curr_mode = i;
 890         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 891         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 892         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 893
 894         /* set the current control values to their default values
 895          * which may have changed in sd_init() */
 896         ctrl = gspca_dev->cam.ctrls;
 897         if (ctrl != NULL) {
 898                 for (i = 0;
 899                      i < gspca_dev->sd_desc->nctrls;
 900                      i++, ctrl++)
 901                         ctrl->val = ctrl->def;
 902         }
 903 }
 904
 905 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 906                         int width, int height)
 907 {
 908         int i;
 909
 910         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 911                 if (width >= gspca_dev->cam.cam_mode[i].width
 912                     && height >= gspca_dev->cam.cam_mode[i].height)
 913                         break;
 914         }
 915         return i;
 916 }
 917
 918 /*
 919  * search a mode with the right pixel format
 920  */
 921 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 922                         int mode,
 923                         int pixfmt)
 924 {
 925         int modeU, modeD;
 926
 927         modeU = modeD = mode;
 928         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 929                 if (--modeD >= 0) {
 930                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 931                                                                 == pixfmt)
 932                                 return modeD;
 933                 }
 934                 if (++modeU < gspca_dev->cam.nmodes) {
 935                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 936                                                                 == pixfmt)
 937                                 return modeU;
 938                 }
 939         }
 940         return -EINVAL;
 941 }
 942
 943 #ifdef CONFIG_VIDEO_ADV_DEBUG
 944 static int vidioc_g_register(struct file *file, void *priv,
 945                         struct v4l2_dbg_register *reg)
 946 {
 947         int ret;
 948         struct gspca_dev *gspca_dev = priv;
 949
 950         if (!gspca_dev->sd_desc->get_chip_ident)
 951                 return -EINVAL;
 952
 953         if (!gspca_dev->sd_desc->get_register)
 954                 return -EINVAL;
 955
 956         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 957                 return -ERESTARTSYS;
 958         gspca_dev->usb_err = 0;
 959         if (gspca_dev->present)
 960                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 961         else
 962                 ret = -ENODEV;
 963         mutex_unlock(&gspca_dev->usb_lock);
 964
 965         return ret;
 966 }
 967
 968 static int vidioc_s_register(struct file *file, void *priv,
 969                         struct v4l2_dbg_register *reg)
 970 {
 971         int ret;
 972         struct gspca_dev *gspca_dev = priv;
 973
 974         if (!gspca_dev->sd_desc->get_chip_ident)
 975                 return -EINVAL;
 976
 977         if (!gspca_dev->sd_desc->set_register)
 978                 return -EINVAL;
 979
 980         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 981                 return -ERESTARTSYS;
 982         gspca_dev->usb_err = 0;
 983         if (gspca_dev->present)
 984                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 985         else
 986                 ret = -ENODEV;
 987         mutex_unlock(&gspca_dev->usb_lock);
 988
 989         return ret;
 990 }
 991 #endif
 992
 993 static int vidioc_g_chip_ident(struct file *file, void *priv,
 994                         struct v4l2_dbg_chip_ident *chip)
 995 {
 996         int ret;
 997         struct gspca_dev *gspca_dev = priv;
 998
 999         if (!gspca_dev->sd_desc->get_chip_ident)
1000                 return -EINVAL;
1001
1002         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1003                 return -ERESTARTSYS;
1004         gspca_dev->usb_err = 0;
1005         if (gspca_dev->present)
1006                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1007         else
1008                 ret = -ENODEV;
1009         mutex_unlock(&gspca_dev->usb_lock);
1010
1011         return ret;
1012 }
1013
1014 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1015                                 struct v4l2_fmtdesc *fmtdesc)
1016 {
1017         struct gspca_dev *gspca_dev = priv;
1018         int i, j, index;
1019         __u32 fmt_tb[8];
1020
1021         /* give an index to each format */
1022         index = 0;
1023         j = 0;
1024         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1025                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1026                 j = 0;
1027                 for (;;) {
1028                         if (fmt_tb[j] == fmt_tb[index])
1029                                 break;
1030                         j++;
1031                 }
1032                 if (j == index) {
1033                         if (fmtdesc->index == index)
1034                                 break;          /* new format */
1035                         index++;
1036                         if (index >= ARRAY_SIZE(fmt_tb))
1037                                 return -EINVAL;
1038                 }
1039         }
1040         if (i < 0)
1041                 return -EINVAL;         /* no more format */
1042
1043         fmtdesc->pixelformat = fmt_tb[index];
1044         if (gspca_is_compressed(fmt_tb[index]))
1045                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1046         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1047         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1048         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1049         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1050         fmtdesc->description[4] = '\0';
1051         return 0;
1052 }
1053
1054 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1055                             struct v4l2_format *fmt)
1056 {
1057         struct gspca_dev *gspca_dev = priv;
1058         int mode;
1059
1060         mode = gspca_dev->curr_mode;
1061         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1062                 sizeof fmt->fmt.pix);
1063         return 0;
1064 }
1065
1066 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1067                         struct v4l2_format *fmt)
1068 {
1069         int w, h, mode, mode2;
1070
1071         w = fmt->fmt.pix.width;
1072         h = fmt->fmt.pix.height;
1073
1074 #ifdef GSPCA_DEBUG
1075         if (gspca_debug & D_CONF)
1076                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1077 #endif
1078         /* search the closest mode for width and height */
1079         mode = wxh_to_mode(gspca_dev, w, h);
1080
1081         /* OK if right palette */
1082         if (gspca_dev->cam.cam_mode[mode].pixelformat
1083                                                 != fmt->fmt.pix.pixelformat) {
1084
1085                 /* else, search the closest mode with the same pixel format */
1086                 mode2 = gspca_get_mode(gspca_dev, mode,
1087                                         fmt->fmt.pix.pixelformat);
1088                 if (mode2 >= 0)
1089                         mode = mode2;
1090 /*              else
1091                         ;                * no chance, return this mode */
1092         }
1093         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1094                 sizeof fmt->fmt.pix);
1095         return mode;                    /* used when s_fmt */
1096 }
1097
1098 static int vidioc_try_fmt_vid_cap(struct file *file,
1099                               void *priv,
1100                               struct v4l2_format *fmt)
1101 {
1102         struct gspca_dev *gspca_dev = priv;
1103         int ret;
1104
1105         ret = try_fmt_vid_cap(gspca_dev, fmt);
1106         if (ret < 0)
1107                 return ret;
1108         return 0;
1109 }
1110
1111 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1112                             struct v4l2_format *fmt)
1113 {
1114         struct gspca_dev *gspca_dev = priv;
1115         int ret;
1116
1117         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1118                 return -ERESTARTSYS;
1119
1120         ret = try_fmt_vid_cap(gspca_dev, fmt);
1121         if (ret < 0)
1122                 goto out;
1123
1124         if (gspca_dev->nframes != 0
1125             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1126                 ret = -EINVAL;
1127                 goto out;
1128         }
1129
1130         if (ret == gspca_dev->curr_mode) {
1131                 ret = 0;
1132                 goto out;                       /* same mode */
1133         }
1134
1135         if (gspca_dev->streaming) {
1136                 ret = -EBUSY;
1137                 goto out;
1138         }
1139         gspca_dev->width = fmt->fmt.pix.width;
1140         gspca_dev->height = fmt->fmt.pix.height;
1141         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1142         gspca_dev->curr_mode = ret;
1143
1144         ret = 0;
1145 out:
1146         mutex_unlock(&gspca_dev->queue_lock);
1147         return ret;
1148 }
1149
1150 static int vidioc_enum_framesizes(struct file *file, void *priv,
1151                                   struct v4l2_frmsizeenum *fsize)
1152 {
1153         struct gspca_dev *gspca_dev = priv;
1154         int i;
1155         __u32 index = 0;
1156
1157         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1158                 if (fsize->pixel_format !=
1159                                 gspca_dev->cam.cam_mode[i].pixelformat)
1160                         continue;
1161
1162                 if (fsize->index == index) {
1163                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1164                         fsize->discrete.width =
1165                                 gspca_dev->cam.cam_mode[i].width;
1166                         fsize->discrete.height =
1167                                 gspca_dev->cam.cam_mode[i].height;
1168                         return 0;
1169                 }
1170                 index++;
1171         }
1172
1173         return -EINVAL;
1174 }
1175
1176 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1177                                       struct v4l2_frmivalenum *fival)
1178 {
1179         struct gspca_dev *gspca_dev = priv;
1180         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1181         __u32 i;
1182
1183         if (gspca_dev->cam.mode_framerates == NULL ||
1184                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1185                 return -EINVAL;
1186
1187         if (fival->pixel_format !=
1188                         gspca_dev->cam.cam_mode[mode].pixelformat)
1189                 return -EINVAL;
1190
1191         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1192                 if (fival->index == i) {
1193                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1194                         fival->discrete.numerator = 1;
1195                         fival->discrete.denominator =
1196                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1197                         return 0;
1198                 }
1199         }
1200
1201         return -EINVAL;
1202 }
1203
1204 static void gspca_release(struct video_device *vfd)
1205 {
1206         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1207
1208         PDEBUG(D_PROBE, "%s released",
1209                 video_device_node_name(&gspca_dev->vdev));
1210
1211         kfree(gspca_dev->usb_buf);
1212         kfree(gspca_dev);
1213 }
1214
1215 static int dev_open(struct file *file)
1216 {
1217         struct gspca_dev *gspca_dev;
1218
1219         PDEBUG(D_STREAM, "[%s] open", current->comm);
1220         gspca_dev = (struct gspca_dev *) video_devdata(file);
1221         if (!gspca_dev->present)
1222                 return -ENODEV;
1223
1224         /* protect the subdriver against rmmod */
1225         if (!try_module_get(gspca_dev->module))
1226                 return -ENODEV;
1227
1228         file->private_data = gspca_dev;
1229 #ifdef GSPCA_DEBUG
1230         /* activate the v4l2 debug */
1231         if (gspca_debug & D_V4L2)
1232                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1233                                         | V4L2_DEBUG_IOCTL_ARG;
1234         else
1235                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1236                                         | V4L2_DEBUG_IOCTL_ARG);
1237 #endif
1238         return 0;
1239 }
1240
1241 static int dev_close(struct file *file)
1242 {
1243         struct gspca_dev *gspca_dev = file->private_data;
1244
1245         PDEBUG(D_STREAM, "[%s] close", current->comm);
1246         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1247                 return -ERESTARTSYS;
1248
1249         /* if the file did the capture, free the streaming resources */
1250         if (gspca_dev->capt_file == file) {
1251                 if (gspca_dev->streaming) {
1252                         mutex_lock(&gspca_dev->usb_lock);
1253                         gspca_dev->usb_err = 0;
1254                         gspca_stream_off(gspca_dev);
1255                         mutex_unlock(&gspca_dev->usb_lock);
1256                 }
1257                 frame_free(gspca_dev);
1258         }
1259         file->private_data = NULL;
1260         module_put(gspca_dev->module);
1261         mutex_unlock(&gspca_dev->queue_lock);
1262
1263         PDEBUG(D_STREAM, "close done");
1264
1265         return 0;
1266 }
1267
1268 static int vidioc_querycap(struct file *file, void  *priv,
1269                            struct v4l2_capability *cap)
1270 {
1271         struct gspca_dev *gspca_dev = priv;
1272         int ret;
1273
1274         /* protect the access to the usb device */
1275         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1276                 return -ERESTARTSYS;
1277         if (!gspca_dev->present) {
1278                 ret = -ENODEV;
1279                 goto out;
1280         }
1281         strncpy((char *) cap->driver, gspca_dev->sd_desc->name,
1282                         sizeof cap->driver);
1283         if (gspca_dev->dev->product != NULL) {
1284                 strncpy((char *) cap->card, gspca_dev->dev->product,
1285                         sizeof cap->card);
1286         } else {
1287                 snprintf((char *) cap->card, sizeof cap->card,
1288                         "USB Camera (%04x:%04x)",
1289                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1290                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1291         }
1292         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1293                         sizeof(cap->bus_info));
1294         cap->version = DRIVER_VERSION_NUMBER;
1295         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1296                           | V4L2_CAP_STREAMING
1297                           | V4L2_CAP_READWRITE;
1298         ret = 0;
1299 out:
1300         mutex_unlock(&gspca_dev->usb_lock);
1301         return ret;
1302 }
1303
1304 static int get_ctrl(struct gspca_dev *gspca_dev,
1305                                    int id)
1306 {
1307         const struct ctrl *ctrls;
1308         int i;
1309
1310         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1311              i < gspca_dev->sd_desc->nctrls;
1312              i++, ctrls++) {
1313                 if (gspca_dev->ctrl_dis & (1 << i))
1314                         continue;
1315                 if (id == ctrls->qctrl.id)
1316                         return i;
1317         }
1318         return -1;
1319 }
1320
1321 static int vidioc_queryctrl(struct file *file, void *priv,
1322                            struct v4l2_queryctrl *q_ctrl)
1323 {
1324         struct gspca_dev *gspca_dev = priv;
1325         const struct ctrl *ctrls;
1326         struct gspca_ctrl *gspca_ctrl;
1327         int i, idx;
1328         u32 id;
1329
1330         id = q_ctrl->id;
1331         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1332                 id &= V4L2_CTRL_ID_MASK;
1333                 id++;
1334                 idx = -1;
1335                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1336                         if (gspca_dev->ctrl_dis & (1 << i))
1337                                 continue;
1338                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1339                                 continue;
1340                         if (idx >= 0
1341                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1342                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1343                                 continue;
1344                         idx = i;
1345                 }
1346         } else {
1347                 idx = get_ctrl(gspca_dev, id);
1348         }
1349         if (idx < 0)
1350                 return -EINVAL;
1351         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1352         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1353         if (gspca_dev->cam.ctrls != NULL) {
1354                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1355                 q_ctrl->default_value = gspca_ctrl->def;
1356                 q_ctrl->minimum = gspca_ctrl->min;
1357                 q_ctrl->maximum = gspca_ctrl->max;
1358         }
1359         if (gspca_dev->ctrl_inac & (1 << idx))
1360                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1361         return 0;
1362 }
1363
1364 static int vidioc_s_ctrl(struct file *file, void *priv,
1365                          struct v4l2_control *ctrl)
1366 {
1367         struct gspca_dev *gspca_dev = priv;
1368         const struct ctrl *ctrls;
1369         struct gspca_ctrl *gspca_ctrl;
1370         int idx, ret;
1371
1372         idx = get_ctrl(gspca_dev, ctrl->id);
1373         if (idx < 0)
1374                 return -EINVAL;
1375         if (gspca_dev->ctrl_inac & (1 << idx))
1376                 return -EINVAL;
1377         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1378         if (gspca_dev->cam.ctrls != NULL) {
1379                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1380                 if (ctrl->value < gspca_ctrl->min
1381                     || ctrl->value > gspca_ctrl->max)
1382                         return -ERANGE;
1383         } else {
1384                 gspca_ctrl = NULL;
1385                 if (ctrl->value < ctrls->qctrl.minimum
1386                     || ctrl->value > ctrls->qctrl.maximum)
1387                         return -ERANGE;
1388         }
1389         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1390         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1391                 return -ERESTARTSYS;
1392         if (!gspca_dev->present) {
1393                 ret = -ENODEV;
1394                 goto out;
1395         }
1396         gspca_dev->usb_err = 0;
1397         if (ctrls->set != NULL) {
1398                 ret = ctrls->set(gspca_dev, ctrl->value);
1399                 goto out;
1400         }
1401         if (gspca_ctrl != NULL) {
1402                 gspca_ctrl->val = ctrl->value;
1403                 if (ctrls->set_control != NULL
1404                  && gspca_dev->streaming)
1405                         ctrls->set_control(gspca_dev);
1406         }
1407         ret = gspca_dev->usb_err;
1408 out:
1409         mutex_unlock(&gspca_dev->usb_lock);
1410         return ret;
1411 }
1412
1413 static int vidioc_g_ctrl(struct file *file, void *priv,
1414                          struct v4l2_control *ctrl)
1415 {
1416         struct gspca_dev *gspca_dev = priv;
1417         const struct ctrl *ctrls;
1418         int idx, ret;
1419
1420         idx = get_ctrl(gspca_dev, ctrl->id);
1421         if (idx < 0)
1422                 return -EINVAL;
1423         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1424
1425         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1426                 return -ERESTARTSYS;
1427         if (!gspca_dev->present) {
1428                 ret = -ENODEV;
1429                 goto out;
1430         }
1431         gspca_dev->usb_err = 0;
1432         if (ctrls->get != NULL) {
1433                 ret = ctrls->get(gspca_dev, &ctrl->value);
1434                 goto out;
1435         }
1436         if (gspca_dev->cam.ctrls != NULL)
1437                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1438         ret = 0;
1439 out:
1440         mutex_unlock(&gspca_dev->usb_lock);
1441         return ret;
1442 }
1443
1444 static int vidioc_querymenu(struct file *file, void *priv,
1445                             struct v4l2_querymenu *qmenu)
1446 {
1447         struct gspca_dev *gspca_dev = priv;
1448
1449         if (!gspca_dev->sd_desc->querymenu)
1450                 return -EINVAL;
1451         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1452 }
1453
1454 static int vidioc_enum_input(struct file *file, void *priv,
1455                                 struct v4l2_input *input)
1456 {
1457         struct gspca_dev *gspca_dev = priv;
1458
1459         if (input->index != 0)
1460                 return -EINVAL;
1461         input->type = V4L2_INPUT_TYPE_CAMERA;
1462         input->status = gspca_dev->cam.input_flags;
1463         strncpy(input->name, gspca_dev->sd_desc->name,
1464                 sizeof input->name);
1465         return 0;
1466 }
1467
1468 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1469 {
1470         *i = 0;
1471         return 0;
1472 }
1473
1474 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1475 {
1476         if (i > 0)
1477                 return -EINVAL;
1478         return (0);
1479 }
1480
1481 static int vidioc_reqbufs(struct file *file, void *priv,
1482                           struct v4l2_requestbuffers *rb)
1483 {
1484         struct gspca_dev *gspca_dev = priv;
1485         int i, ret = 0, streaming;
1486
1487         i = rb->memory;                 /* (avoid compilation warning) */
1488         switch (i) {
1489         case GSPCA_MEMORY_READ:                 /* (internal call) */
1490         case V4L2_MEMORY_MMAP:
1491         case V4L2_MEMORY_USERPTR:
1492                 break;
1493         default:
1494                 return -EINVAL;
1495         }
1496         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1497                 return -ERESTARTSYS;
1498
1499         if (gspca_dev->memory != GSPCA_MEMORY_NO
1500             && gspca_dev->memory != GSPCA_MEMORY_READ
1501             && gspca_dev->memory != rb->memory) {
1502                 ret = -EBUSY;
1503                 goto out;
1504         }
1505
1506         /* only one file may do the capture */
1507         if (gspca_dev->capt_file != NULL
1508             && gspca_dev->capt_file != file) {
1509                 ret = -EBUSY;
1510                 goto out;
1511         }
1512
1513         /* if allocated, the buffers must not be mapped */
1514         for (i = 0; i < gspca_dev->nframes; i++) {
1515                 if (gspca_dev->frame[i].vma_use_count) {
1516                         ret = -EBUSY;
1517                         goto out;
1518                 }
1519         }
1520
1521         /* stop streaming */
1522         streaming = gspca_dev->streaming;
1523         if (streaming) {
1524                 mutex_lock(&gspca_dev->usb_lock);
1525                 gspca_dev->usb_err = 0;
1526                 gspca_stream_off(gspca_dev);
1527                 mutex_unlock(&gspca_dev->usb_lock);
1528
1529                 /* Don't restart the stream when switching from read
1530                  * to mmap mode */
1531                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1532                         streaming = 0;
1533         }
1534
1535         /* free the previous allocated buffers, if any */
1536         if (gspca_dev->nframes != 0)
1537                 frame_free(gspca_dev);
1538         if (rb->count == 0)                     /* unrequest */
1539                 goto out;
1540         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1541         if (ret == 0) {
1542                 rb->count = gspca_dev->nframes;
1543                 if (streaming)
1544                         ret = gspca_init_transfer(gspca_dev);
1545         }
1546 out:
1547         mutex_unlock(&gspca_dev->queue_lock);
1548         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1549         return ret;
1550 }
1551
1552 static int vidioc_querybuf(struct file *file, void *priv,
1553                            struct v4l2_buffer *v4l2_buf)
1554 {
1555         struct gspca_dev *gspca_dev = priv;
1556         struct gspca_frame *frame;
1557
1558         if (v4l2_buf->index < 0
1559             || v4l2_buf->index >= gspca_dev->nframes)
1560                 return -EINVAL;
1561
1562         frame = &gspca_dev->frame[v4l2_buf->index];
1563         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1564         return 0;
1565 }
1566
1567 static int vidioc_streamon(struct file *file, void *priv,
1568                            enum v4l2_buf_type buf_type)
1569 {
1570         struct gspca_dev *gspca_dev = priv;
1571         int ret;
1572
1573         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1574                 return -EINVAL;
1575         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1576                 return -ERESTARTSYS;
1577
1578         /* check the capture file */
1579         if (gspca_dev->capt_file != file) {
1580                 ret = -EBUSY;
1581                 goto out;
1582         }
1583
1584         if (gspca_dev->nframes == 0
1585             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1586                 ret = -EINVAL;
1587                 goto out;
1588         }
1589         if (!gspca_dev->streaming) {
1590                 ret = gspca_init_transfer(gspca_dev);
1591                 if (ret < 0)
1592                         goto out;
1593         }
1594 #ifdef GSPCA_DEBUG
1595         if (gspca_debug & D_STREAM) {
1596                 PDEBUG_MODE("stream on OK",
1597                         gspca_dev->pixfmt,
1598                         gspca_dev->width,
1599                         gspca_dev->height);
1600         }
1601 #endif
1602         ret = 0;
1603 out:
1604         mutex_unlock(&gspca_dev->queue_lock);
1605         return ret;
1606 }
1607
1608 static int vidioc_streamoff(struct file *file, void *priv,
1609                                 enum v4l2_buf_type buf_type)
1610 {
1611         struct gspca_dev *gspca_dev = priv;
1612         int ret;
1613
1614         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1615                 return -EINVAL;
1616
1617         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1618                 return -ERESTARTSYS;
1619
1620         if (!gspca_dev->streaming) {
1621                 ret = 0;
1622                 goto out;
1623         }
1624
1625         /* check the capture file */
1626         if (gspca_dev->capt_file != file) {
1627                 ret = -EBUSY;
1628                 goto out;
1629         }
1630
1631         /* stop streaming */
1632         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1633                 ret = -ERESTARTSYS;
1634                 goto out;
1635         }
1636         gspca_dev->usb_err = 0;
1637         gspca_stream_off(gspca_dev);
1638         mutex_unlock(&gspca_dev->usb_lock);
1639         /* In case another thread is waiting in dqbuf */
1640         wake_up_interruptible(&gspca_dev->wq);
1641
1642         /* empty the transfer queues */
1643         atomic_set(&gspca_dev->fr_q, 0);
1644         atomic_set(&gspca_dev->fr_i, 0);
1645         gspca_dev->fr_o = 0;
1646         ret = 0;
1647 out:
1648         mutex_unlock(&gspca_dev->queue_lock);
1649         return ret;
1650 }
1651
1652 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1653                         struct v4l2_jpegcompression *jpegcomp)
1654 {
1655         struct gspca_dev *gspca_dev = priv;
1656         int ret;
1657
1658         if (!gspca_dev->sd_desc->get_jcomp)
1659                 return -EINVAL;
1660         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1661                 return -ERESTARTSYS;
1662         gspca_dev->usb_err = 0;
1663         if (gspca_dev->present)
1664                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1665         else
1666                 ret = -ENODEV;
1667         mutex_unlock(&gspca_dev->usb_lock);
1668         return ret;
1669 }
1670
1671 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1672                         struct v4l2_jpegcompression *jpegcomp)
1673 {
1674         struct gspca_dev *gspca_dev = priv;
1675         int ret;
1676
1677         if (!gspca_dev->sd_desc->set_jcomp)
1678                 return -EINVAL;
1679         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1680                 return -ERESTARTSYS;
1681         gspca_dev->usb_err = 0;
1682         if (gspca_dev->present)
1683                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1684         else
1685                 ret = -ENODEV;
1686         mutex_unlock(&gspca_dev->usb_lock);
1687         return ret;
1688 }
1689
1690 static int vidioc_g_parm(struct file *filp, void *priv,
1691                         struct v4l2_streamparm *parm)
1692 {
1693         struct gspca_dev *gspca_dev = priv;
1694
1695         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1696
1697         if (gspca_dev->sd_desc->get_streamparm) {
1698                 int ret;
1699
1700                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1701                         return -ERESTARTSYS;
1702                 if (gspca_dev->present) {
1703                         gspca_dev->usb_err = 0;
1704                         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1705                         ret = gspca_dev->usb_err;
1706                 } else {
1707                         ret = -ENODEV;
1708                 }
1709                 mutex_unlock(&gspca_dev->usb_lock);
1710                 return ret;
1711         }
1712
1713         return 0;
1714 }
1715
1716 static int vidioc_s_parm(struct file *filp, void *priv,
1717                         struct v4l2_streamparm *parm)
1718 {
1719         struct gspca_dev *gspca_dev = priv;
1720         int n;
1721
1722         n = parm->parm.capture.readbuffers;
1723         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1724                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1725         else
1726                 gspca_dev->nbufread = n;
1727
1728         if (gspca_dev->sd_desc->set_streamparm) {
1729                 int ret;
1730
1731                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1732                         return -ERESTARTSYS;
1733                 if (gspca_dev->present) {
1734                         gspca_dev->usb_err = 0;
1735                         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1736                         ret = gspca_dev->usb_err;
1737                 } else {
1738                         ret = -ENODEV;
1739                 }
1740                 mutex_unlock(&gspca_dev->usb_lock);
1741                 return ret;
1742         }
1743
1744         return 0;
1745 }
1746
1747 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1748 {
1749         struct gspca_dev *gspca_dev = file->private_data;
1750         struct gspca_frame *frame;
1751         struct page *page;
1752         unsigned long addr, start, size;
1753         int i, ret;
1754
1755         start = vma->vm_start;
1756         size = vma->vm_end - vma->vm_start;
1757         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1758
1759         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1760                 return -ERESTARTSYS;
1761         if (!gspca_dev->present) {
1762                 ret = -ENODEV;
1763                 goto out;
1764         }
1765         if (gspca_dev->capt_file != file) {
1766                 ret = -EINVAL;
1767                 goto out;
1768         }
1769
1770         frame = NULL;
1771         for (i = 0; i < gspca_dev->nframes; ++i) {
1772                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1773                         PDEBUG(D_STREAM, "mmap bad memory type");
1774                         break;
1775                 }
1776                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1777                                                 == vma->vm_pgoff) {
1778                         frame = &gspca_dev->frame[i];
1779                         break;
1780                 }
1781         }
1782         if (frame == NULL) {
1783                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1784                 ret = -EINVAL;
1785                 goto out;
1786         }
1787         if (size != frame->v4l2_buf.length) {
1788                 PDEBUG(D_STREAM, "mmap bad size");
1789                 ret = -EINVAL;
1790                 goto out;
1791         }
1792
1793         /*
1794          * - VM_IO marks the area as being a mmaped region for I/O to a
1795          *   device. It also prevents the region from being core dumped.
1796          */
1797         vma->vm_flags |= VM_IO;
1798
1799         addr = (unsigned long) frame->data;
1800         while (size > 0) {
1801                 page = vmalloc_to_page((void *) addr);
1802                 ret = vm_insert_page(vma, start, page);
1803                 if (ret < 0)
1804                         goto out;
1805                 start += PAGE_SIZE;
1806                 addr += PAGE_SIZE;
1807                 size -= PAGE_SIZE;
1808         }
1809
1810         vma->vm_ops = &gspca_vm_ops;
1811         vma->vm_private_data = frame;
1812         gspca_vm_open(vma);
1813         ret = 0;
1814 out:
1815         mutex_unlock(&gspca_dev->queue_lock);
1816         return ret;
1817 }
1818
1819 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1820                                 enum v4l2_memory memory)
1821 {
1822         if (!gspca_dev->present)
1823                 return -ENODEV;
1824         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1825                         !gspca_dev->streaming)
1826                 return -EINVAL;
1827
1828         /* check if a frame is ready */
1829         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1830 }
1831
1832 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1833                         enum v4l2_memory memory)
1834 {
1835         int ret;
1836
1837         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1838                 return -ERESTARTSYS;
1839         ret = frame_ready_nolock(gspca_dev, file, memory);
1840         mutex_unlock(&gspca_dev->queue_lock);
1841         return ret;
1842 }
1843
1844 /*
1845  * dequeue a video buffer
1846  *
1847  * If nonblock_ing is false, block until a buffer is available.
1848  */
1849 static int vidioc_dqbuf(struct file *file, void *priv,
1850                         struct v4l2_buffer *v4l2_buf)
1851 {
1852         struct gspca_dev *gspca_dev = priv;
1853         struct gspca_frame *frame;
1854         int i, j, ret;
1855
1856         PDEBUG(D_FRAM, "dqbuf");
1857
1858         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1859                 return -ERESTARTSYS;
1860
1861         for (;;) {
1862                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1863                 if (ret < 0)
1864                         goto out;
1865                 if (ret > 0)
1866                         break;
1867
1868                 mutex_unlock(&gspca_dev->queue_lock);
1869
1870                 if (file->f_flags & O_NONBLOCK)
1871                         return -EAGAIN;
1872
1873                 /* wait till a frame is ready */
1874                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1875                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1876                         msecs_to_jiffies(3000));
1877                 if (ret < 0)
1878                         return ret;
1879                 if (ret == 0)
1880                         return -EIO;
1881
1882                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1883                         return -ERESTARTSYS;
1884         }
1885
1886         i = gspca_dev->fr_o;
1887         j = gspca_dev->fr_queue[i];
1888         frame = &gspca_dev->frame[j];
1889
1890         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1891
1892         if (gspca_dev->sd_desc->dq_callback) {
1893                 mutex_lock(&gspca_dev->usb_lock);
1894                 gspca_dev->usb_err = 0;
1895                 if (gspca_dev->present)
1896                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1897                 mutex_unlock(&gspca_dev->usb_lock);
1898         }
1899
1900         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1901         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1902         PDEBUG(D_FRAM, "dqbuf %d", j);
1903         ret = 0;
1904
1905         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1906                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1907                                  frame->data,
1908                                  frame->v4l2_buf.bytesused)) {
1909                         PDEBUG(D_ERR|D_STREAM,
1910                                 "dqbuf cp to user failed");
1911                         ret = -EFAULT;
1912                 }
1913         }
1914 out:
1915         mutex_unlock(&gspca_dev->queue_lock);
1916         return ret;
1917 }
1918
1919 /*
1920  * queue a video buffer
1921  *
1922  * Attempting to queue a buffer that has already been
1923  * queued will return -EINVAL.
1924  */
1925 static int vidioc_qbuf(struct file *file, void *priv,
1926                         struct v4l2_buffer *v4l2_buf)
1927 {
1928         struct gspca_dev *gspca_dev = priv;
1929         struct gspca_frame *frame;
1930         int i, index, ret;
1931
1932         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1933
1934         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1935                 return -ERESTARTSYS;
1936
1937         index = v4l2_buf->index;
1938         if ((unsigned) index >= gspca_dev->nframes) {
1939                 PDEBUG(D_FRAM,
1940                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1941                 ret = -EINVAL;
1942                 goto out;
1943         }
1944         if (v4l2_buf->memory != gspca_dev->memory) {
1945                 PDEBUG(D_FRAM, "qbuf bad memory type");
1946                 ret = -EINVAL;
1947                 goto out;
1948         }
1949
1950         frame = &gspca_dev->frame[index];
1951         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1952                 PDEBUG(D_FRAM, "qbuf bad state");
1953                 ret = -EINVAL;
1954                 goto out;
1955         }
1956
1957         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1958
1959         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1960                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1961                 frame->v4l2_buf.length = v4l2_buf->length;
1962         }
1963
1964         /* put the buffer in the 'queued' queue */
1965         i = atomic_read(&gspca_dev->fr_q);
1966         gspca_dev->fr_queue[i] = index;
1967         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1968
1969         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1970         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1971         ret = 0;
1972 out:
1973         mutex_unlock(&gspca_dev->queue_lock);
1974         return ret;
1975 }
1976
1977 /*
1978  * allocate the resources for read()
1979  */
1980 static int read_alloc(struct gspca_dev *gspca_dev,
1981                         struct file *file)
1982 {
1983         struct v4l2_buffer v4l2_buf;
1984         int i, ret;
1985
1986         PDEBUG(D_STREAM, "read alloc");
1987         if (gspca_dev->nframes == 0) {
1988                 struct v4l2_requestbuffers rb;
1989
1990                 memset(&rb, 0, sizeof rb);
1991                 rb.count = gspca_dev->nbufread;
1992                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1993                 rb.memory = GSPCA_MEMORY_READ;
1994                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1995                 if (ret != 0) {
1996                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1997                         return ret;
1998                 }
1999                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2000                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2001                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2002                 for (i = 0; i < gspca_dev->nbufread; i++) {
2003                         v4l2_buf.index = i;
2004                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2005                         if (ret != 0) {
2006                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2007                                 return ret;
2008                         }
2009                 }
2010                 gspca_dev->memory = GSPCA_MEMORY_READ;
2011         }
2012
2013         /* start streaming */
2014         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2015         if (ret != 0)
2016                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2017         return ret;
2018 }
2019
2020 static unsigned int dev_poll(struct file *file, poll_table *wait)
2021 {
2022         struct gspca_dev *gspca_dev = file->private_data;
2023         int ret;
2024
2025         PDEBUG(D_FRAM, "poll");
2026
2027         poll_wait(file, &gspca_dev->wq, wait);
2028
2029         /* if reqbufs is not done, the user would use read() */
2030         if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2031                 ret = read_alloc(gspca_dev, file);
2032                 if (ret != 0)
2033                         return POLLERR;
2034         }
2035
2036         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2037                 return POLLERR;
2038
2039         /* check if an image has been received */
2040         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2041                 ret = POLLIN | POLLRDNORM;      /* yes */
2042         else
2043                 ret = 0;
2044         mutex_unlock(&gspca_dev->queue_lock);
2045         if (!gspca_dev->present)
2046                 return POLLHUP;
2047         return ret;
2048 }
2049
2050 static ssize_t dev_read(struct file *file, char __user *data,
2051                     size_t count, loff_t *ppos)
2052 {
2053         struct gspca_dev *gspca_dev = file->private_data;
2054         struct gspca_frame *frame;
2055         struct v4l2_buffer v4l2_buf;
2056         struct timeval timestamp;
2057         int n, ret, ret2;
2058
2059         PDEBUG(D_FRAM, "read (%zd)", count);
2060         if (!gspca_dev->present)
2061                 return -ENODEV;
2062         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2063                 ret = read_alloc(gspca_dev, file);
2064                 if (ret != 0)
2065                         return ret;
2066         }
2067
2068         /* get a frame */
2069         timestamp = ktime_to_timeval(ktime_get());
2070         timestamp.tv_sec--;
2071         n = 2;
2072         for (;;) {
2073                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2074                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2075                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2076                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2077                 if (ret != 0) {
2078                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2079                         return ret;
2080                 }
2081
2082                 /* if the process slept for more than 1 second,
2083                  * get a newer frame */
2084                 frame = &gspca_dev->frame[v4l2_buf.index];
2085                 if (--n < 0)
2086                         break;                  /* avoid infinite loop */
2087                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2088                         break;
2089                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2090                 if (ret != 0) {
2091                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2092                         return ret;
2093                 }
2094         }
2095
2096         /* copy the frame */
2097         if (count > frame->v4l2_buf.bytesused)
2098                 count = frame->v4l2_buf.bytesused;
2099         ret = copy_to_user(data, frame->data, count);
2100         if (ret != 0) {
2101                 PDEBUG(D_ERR|D_STREAM,
2102                         "read cp to user lack %d / %zd", ret, count);
2103                 ret = -EFAULT;
2104                 goto out;
2105         }
2106         ret = count;
2107 out:
2108         /* in each case, requeue the buffer */
2109         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2110         if (ret2 != 0)
2111                 return ret2;
2112         return ret;
2113 }
2114
2115 static struct v4l2_file_operations dev_fops = {
2116         .owner = THIS_MODULE,
2117         .open = dev_open,
2118         .release = dev_close,
2119         .read = dev_read,
2120         .mmap = dev_mmap,
2121         .unlocked_ioctl = video_ioctl2,
2122         .poll   = dev_poll,
2123 };
2124
2125 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2126         .vidioc_querycap        = vidioc_querycap,
2127         .vidioc_dqbuf           = vidioc_dqbuf,
2128         .vidioc_qbuf            = vidioc_qbuf,
2129         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2130         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2131         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2132         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2133         .vidioc_streamon        = vidioc_streamon,
2134         .vidioc_queryctrl       = vidioc_queryctrl,
2135         .vidioc_g_ctrl          = vidioc_g_ctrl,
2136         .vidioc_s_ctrl          = vidioc_s_ctrl,
2137         .vidioc_querymenu       = vidioc_querymenu,
2138         .vidioc_enum_input      = vidioc_enum_input,
2139         .vidioc_g_input         = vidioc_g_input,
2140         .vidioc_s_input         = vidioc_s_input,
2141         .vidioc_reqbufs         = vidioc_reqbufs,
2142         .vidioc_querybuf        = vidioc_querybuf,
2143         .vidioc_streamoff       = vidioc_streamoff,
2144         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2145         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2146         .vidioc_g_parm          = vidioc_g_parm,
2147         .vidioc_s_parm          = vidioc_s_parm,
2148         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2149         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2150 #ifdef CONFIG_VIDEO_ADV_DEBUG
2151         .vidioc_g_register      = vidioc_g_register,
2152         .vidioc_s_register      = vidioc_s_register,
2153 #endif
2154         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2155 };
2156
2157 static const struct video_device gspca_template = {
2158         .name = "gspca main driver",
2159         .fops = &dev_fops,
2160         .ioctl_ops = &dev_ioctl_ops,
2161         .release = gspca_release,
2162 };
2163
2164 /* initialize the controls */
2165 static void ctrls_init(struct gspca_dev *gspca_dev)
2166 {
2167         struct gspca_ctrl *ctrl;
2168         int i;
2169
2170         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2171              i < gspca_dev->sd_desc->nctrls;
2172              i++, ctrl++) {
2173                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2174                 ctrl->val = ctrl->def;
2175                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2176                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2177         }
2178 }
2179
2180 /*
2181  * probe and create a new gspca device
2182  *
2183  * This function must be called by the sub-driver when it is
2184  * called for probing a new device.
2185  */
2186 int gspca_dev_probe2(struct usb_interface *intf,
2187                 const struct usb_device_id *id,
2188                 const struct sd_desc *sd_desc,
2189                 int dev_size,
2190                 struct module *module)
2191 {
2192         struct gspca_dev *gspca_dev;
2193         struct usb_device *dev = interface_to_usbdev(intf);
2194         int ret;
2195
2196         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2197
2198         /* create the device */
2199         if (dev_size < sizeof *gspca_dev)
2200                 dev_size = sizeof *gspca_dev;
2201         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2202         if (!gspca_dev) {
2203                 err("couldn't kzalloc gspca struct");
2204                 return -ENOMEM;
2205         }
2206         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2207         if (!gspca_dev->usb_buf) {
2208                 err("out of memory");
2209                 ret = -ENOMEM;
2210                 goto out;
2211         }
2212         gspca_dev->dev = dev;
2213         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2214         gspca_dev->nbalt = intf->num_altsetting;
2215
2216         /* check if any audio device */
2217         if (dev->config->desc.bNumInterfaces != 1) {
2218                 int i;
2219                 struct usb_interface *intf2;
2220
2221                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2222                         intf2 = dev->config->interface[i];
2223                         if (intf2 != NULL
2224                          && intf2->altsetting != NULL
2225                          && intf2->altsetting->desc.bInterfaceClass ==
2226                                          USB_CLASS_AUDIO) {
2227                                 gspca_dev->audio = 1;
2228                                 break;
2229                         }
2230                 }
2231         }
2232
2233         gspca_dev->sd_desc = sd_desc;
2234         gspca_dev->nbufread = 2;
2235         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2236
2237         /* configure the subdriver and initialize the USB device */
2238         ret = sd_desc->config(gspca_dev, id);
2239         if (ret < 0)
2240                 goto out;
2241         if (gspca_dev->cam.ctrls != NULL)
2242                 ctrls_init(gspca_dev);
2243         ret = sd_desc->init(gspca_dev);
2244         if (ret < 0)
2245                 goto out;
2246         gspca_set_default_mode(gspca_dev);
2247
2248         ret = gspca_input_connect(gspca_dev);
2249         if (ret)
2250                 goto out;
2251
2252         mutex_init(&gspca_dev->usb_lock);
2253         mutex_init(&gspca_dev->queue_lock);
2254         init_waitqueue_head(&gspca_dev->wq);
2255
2256         /* init video stuff */
2257         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2258         gspca_dev->vdev.parent = &intf->dev;
2259         gspca_dev->module = module;
2260         gspca_dev->present = 1;
2261         ret = video_register_device(&gspca_dev->vdev,
2262                                   VFL_TYPE_GRABBER,
2263                                   -1);
2264         if (ret < 0) {
2265                 err("video_register_device err %d", ret);
2266                 goto out;
2267         }
2268
2269         usb_set_intfdata(intf, gspca_dev);
2270         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2271
2272         gspca_input_create_urb(gspca_dev);
2273
2274         return 0;
2275 out:
2276 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2277         if (gspca_dev->input_dev)
2278                 input_unregister_device(gspca_dev->input_dev);
2279 #endif
2280         kfree(gspca_dev->usb_buf);
2281         kfree(gspca_dev);
2282         return ret;
2283 }
2284 EXPORT_SYMBOL(gspca_dev_probe2);
2285
2286 /* same function as the previous one, but check the interface */
2287 int gspca_dev_probe(struct usb_interface *intf,
2288                 const struct usb_device_id *id,
2289                 const struct sd_desc *sd_desc,
2290                 int dev_size,
2291                 struct module *module)
2292 {
2293         struct usb_device *dev = interface_to_usbdev(intf);
2294
2295         /* we don't handle multi-config cameras */
2296         if (dev->descriptor.bNumConfigurations != 1) {
2297                 err("%04x:%04x too many config",
2298                                 id->idVendor, id->idProduct);
2299                 return -ENODEV;
2300         }
2301
2302         /* the USB video interface must be the first one */
2303         if (dev->config->desc.bNumInterfaces != 1
2304          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2305                 return -ENODEV;
2306
2307         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2308 }
2309 EXPORT_SYMBOL(gspca_dev_probe);
2310
2311 /*
2312  * USB disconnection
2313  *
2314  * This function must be called by the sub-driver
2315  * when the device disconnects, after the specific resources are freed.
2316  */
2317 void gspca_disconnect(struct usb_interface *intf)
2318 {
2319         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2320 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2321         struct input_dev *input_dev;
2322 #endif
2323
2324         PDEBUG(D_PROBE, "%s disconnect",
2325                 video_device_node_name(&gspca_dev->vdev));
2326         mutex_lock(&gspca_dev->usb_lock);
2327
2328         gspca_dev->present = 0;
2329         wake_up_interruptible(&gspca_dev->wq);
2330
2331         destroy_urbs(gspca_dev);
2332
2333 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2334         gspca_input_destroy_urb(gspca_dev);
2335         input_dev = gspca_dev->input_dev;
2336         if (input_dev) {
2337                 gspca_dev->input_dev = NULL;
2338                 input_unregister_device(input_dev);
2339         }
2340 #endif
2341
2342         /* the device is freed at exit of this function */
2343         gspca_dev->dev = NULL;
2344         mutex_unlock(&gspca_dev->usb_lock);
2345
2346         usb_set_intfdata(intf, NULL);
2347
2348         /* release the device */
2349         /* (this will call gspca_release() immediately or on last close) */
2350         video_unregister_device(&gspca_dev->vdev);
2351
2352 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2353 }
2354 EXPORT_SYMBOL(gspca_disconnect);
2355
2356 #ifdef CONFIG_PM
2357 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2358 {
2359         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2360
2361         if (!gspca_dev->streaming)
2362                 return 0;
2363         gspca_dev->frozen = 1;          /* avoid urb error messages */
2364         if (gspca_dev->sd_desc->stopN)
2365                 gspca_dev->sd_desc->stopN(gspca_dev);
2366         destroy_urbs(gspca_dev);
2367         gspca_input_destroy_urb(gspca_dev);
2368         gspca_set_alt0(gspca_dev);
2369         if (gspca_dev->sd_desc->stop0)
2370                 gspca_dev->sd_desc->stop0(gspca_dev);
2371         return 0;
2372 }
2373 EXPORT_SYMBOL(gspca_suspend);
2374
2375 int gspca_resume(struct usb_interface *intf)
2376 {
2377         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2378
2379         gspca_dev->frozen = 0;
2380         gspca_dev->sd_desc->init(gspca_dev);
2381         gspca_input_create_urb(gspca_dev);
2382         if (gspca_dev->streaming)
2383                 return gspca_init_transfer(gspca_dev);
2384         return 0;
2385 }
2386 EXPORT_SYMBOL(gspca_resume);
2387 #endif
2388 /* -- cam driver utility functions -- */
2389
2390 /* auto gain and exposure algorithm based on the knee algorithm described here:
2391    http://ytse.tricolour.net/docs/LowLightOptimization.html
2392
2393    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2394    where changed. */
2395 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2396         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2397 {
2398         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2399         const struct ctrl *gain_ctrl = NULL;
2400         const struct ctrl *exposure_ctrl = NULL;
2401         const struct ctrl *autogain_ctrl = NULL;
2402         int retval = 0;
2403
2404         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2405                 if (gspca_dev->ctrl_dis & (1 << i))
2406                         continue;
2407                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2408                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2409                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2410                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2411                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2412                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2413         }
2414         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2415                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2416                         "on cam without (auto)gain/exposure");
2417                 return 0;
2418         }
2419
2420         if (gain_ctrl->get(gspca_dev, &gain) ||
2421                         exposure_ctrl->get(gspca_dev, &exposure) ||
2422                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2423                 return 0;
2424
2425         orig_gain = gain;
2426         orig_exposure = exposure;
2427
2428         /* If we are of a multiple of deadzone, do multiple steps to reach the
2429            desired lumination fast (with the risc of a slight overshoot) */
2430         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2431
2432         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2433                 avg_lum, desired_avg_lum, steps);
2434
2435         for (i = 0; i < steps; i++) {
2436                 if (avg_lum > desired_avg_lum) {
2437                         if (gain > gain_knee)
2438                                 gain--;
2439                         else if (exposure > exposure_knee)
2440                                 exposure--;
2441                         else if (gain > gain_ctrl->qctrl.default_value)
2442                                 gain--;
2443                         else if (exposure > exposure_ctrl->qctrl.minimum)
2444                                 exposure--;
2445                         else if (gain > gain_ctrl->qctrl.minimum)
2446                                 gain--;
2447                         else
2448                                 break;
2449                 } else {
2450                         if (gain < gain_ctrl->qctrl.default_value)
2451                                 gain++;
2452                         else if (exposure < exposure_knee)
2453                                 exposure++;
2454                         else if (gain < gain_knee)
2455                                 gain++;
2456                         else if (exposure < exposure_ctrl->qctrl.maximum)
2457                                 exposure++;
2458                         else if (gain < gain_ctrl->qctrl.maximum)
2459                                 gain++;
2460                         else
2461                                 break;
2462                 }
2463         }
2464
2465         if (gain != orig_gain) {
2466                 gain_ctrl->set(gspca_dev, gain);
2467                 retval = 1;
2468         }
2469         if (exposure != orig_exposure) {
2470                 exposure_ctrl->set(gspca_dev, exposure);
2471                 retval = 1;
2472         }
2473
2474         return retval;
2475 }
2476 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2477
2478 /* -- module insert / remove -- */
2479 static int __init gspca_init(void)
2480 {
2481         info("v%d.%d.%d registered",
2482                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2483                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2484                 DRIVER_VERSION_NUMBER & 0xff);
2485         return 0;
2486 }
2487 static void __exit gspca_exit(void)
2488 {
2489 }
2490
2491 module_init(gspca_init);
2492 module_exit(gspca_exit);
2493
2494 #ifdef GSPCA_DEBUG
2495 module_param_named(debug, gspca_debug, int, 0644);
2496 MODULE_PARM_DESC(debug,
2497                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2498                 " 0x08:stream 0x10:frame 0x20:packet"
2499                 " 0x0100: v4l2");
2500 #endif