drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/ktime.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 11, 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  * On LAST_PACKET, a new frame is returned.
 418  */
 419 void gspca_frame_add(struct gspca_dev *gspca_dev,
 420                         enum gspca_packet_type packet_type,
 421                         const u8 *data,
 422                         int len)
 423 {
 424         struct gspca_frame *frame;
 425         int i, j;
 426
 427         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 428
 429         if (packet_type == FIRST_PACKET) {
 430                 i = atomic_read(&gspca_dev->fr_i);
 431
 432                 /* if there are no queued buffer, discard the whole frame */
 433                 if (i == atomic_read(&gspca_dev->fr_q)) {
 434                         gspca_dev->last_packet_type = DISCARD_PACKET;
 435                         gspca_dev->sequence++;
 436                         return;
 437                 }
 438                 j = gspca_dev->fr_queue[i];
 439                 frame = &gspca_dev->frame[j];
 440                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 441                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 442                 gspca_dev->image = frame->data;
 443                 gspca_dev->image_len = 0;
 444         } else {
 445                 switch (gspca_dev->last_packet_type) {
 446                 case DISCARD_PACKET:
 447                         if (packet_type == LAST_PACKET)
 448                                 gspca_dev->last_packet_type = packet_type;
 449                         return;
 450                 case LAST_PACKET:
 451                         return;
 452                 }
 453         }
 454
 455         /* append the packet to the frame buffer */
 456         if (len > 0) {
 457                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 458                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 459                                 gspca_dev->image_len + len,
 460                                 gspca_dev->frsz);
 461                         packet_type = DISCARD_PACKET;
 462                 } else {
 463 /* !! image is NULL only when last pkt is LAST or DISCARD
 464                         if (gspca_dev->image == NULL) {
 465                                 err("gspca_frame_add() image == NULL");
 466                                 return;
 467                         }
 468  */
 469                         memcpy(gspca_dev->image + gspca_dev->image_len,
 470                                 data, len);
 471                         gspca_dev->image_len += len;
 472                 }
 473         }
 474         gspca_dev->last_packet_type = packet_type;
 475
 476         /* if last packet, invalidate packet concatenation until
 477          * next first packet, wake up the application and advance
 478          * in the queue */
 479         if (packet_type == LAST_PACKET) {
 480                 i = atomic_read(&gspca_dev->fr_i);
 481                 j = gspca_dev->fr_queue[i];
 482                 frame = &gspca_dev->frame[j];
 483                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 484                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 485                                          | V4L2_BUF_FLAG_DONE)
 486                                         & ~V4L2_BUF_FLAG_QUEUED;
 487                 i = (i + 1) % GSPCA_MAX_FRAMES;
 488                 atomic_set(&gspca_dev->fr_i, i);
 489                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 490                 PDEBUG(D_FRAM, "frame complete len:%d",
 491                         frame->v4l2_buf.bytesused);
 492                 gspca_dev->image = NULL;
 493                 gspca_dev->image_len = 0;
 494         }
 495 }
 496 EXPORT_SYMBOL(gspca_frame_add);
 497
 498 static int gspca_is_compressed(__u32 format)
 499 {
 500         switch (format) {
 501         case V4L2_PIX_FMT_MJPEG:
 502         case V4L2_PIX_FMT_JPEG:
 503         case V4L2_PIX_FMT_SPCA561:
 504         case V4L2_PIX_FMT_PAC207:
 505         case V4L2_PIX_FMT_MR97310A:
 506                 return 1;
 507         }
 508         return 0;
 509 }
 510
 511 static int frame_alloc(struct gspca_dev *gspca_dev,
 512                         unsigned int count)
 513 {
 514         struct gspca_frame *frame;
 515         unsigned int frsz;
 516         int i;
 517
 518         i = gspca_dev->curr_mode;
 519         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 520         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 521         frsz = PAGE_ALIGN(frsz);
 522         gspca_dev->frsz = frsz;
 523         if (count >= GSPCA_MAX_FRAMES)
 524                 count = GSPCA_MAX_FRAMES - 1;
 525         gspca_dev->frbuf = vmalloc_32(frsz * count);
 526         if (!gspca_dev->frbuf) {
 527                 err("frame alloc failed");
 528                 return -ENOMEM;
 529         }
 530         gspca_dev->nframes = count;
 531         for (i = 0; i < count; i++) {
 532                 frame = &gspca_dev->frame[i];
 533                 frame->v4l2_buf.index = i;
 534                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 535                 frame->v4l2_buf.flags = 0;
 536                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 537                 frame->v4l2_buf.length = frsz;
 538                 frame->v4l2_buf.memory = gspca_dev->memory;
 539                 frame->v4l2_buf.sequence = 0;
 540                 frame->data = gspca_dev->frbuf + i * frsz;
 541                 frame->v4l2_buf.m.offset = i * frsz;
 542         }
 543         atomic_set(&gspca_dev->fr_q, 0);
 544         atomic_set(&gspca_dev->fr_i, 0);
 545         gspca_dev->fr_o = 0;
 546         return 0;
 547 }
 548
 549 static void frame_free(struct gspca_dev *gspca_dev)
 550 {
 551         int i;
 552
 553         PDEBUG(D_STREAM, "frame free");
 554         if (gspca_dev->frbuf != NULL) {
 555                 vfree(gspca_dev->frbuf);
 556                 gspca_dev->frbuf = NULL;
 557                 for (i = 0; i < gspca_dev->nframes; i++)
 558                         gspca_dev->frame[i].data = NULL;
 559         }
 560         gspca_dev->nframes = 0;
 561 }
 562
 563 static void destroy_urbs(struct gspca_dev *gspca_dev)
 564 {
 565         struct urb *urb;
 566         unsigned int i;
 567
 568         PDEBUG(D_STREAM, "kill transfer");
 569         for (i = 0; i < MAX_NURBS; i++) {
 570                 urb = gspca_dev->urb[i];
 571                 if (urb == NULL)
 572                         break;
 573
 574                 gspca_dev->urb[i] = NULL;
 575                 usb_kill_urb(urb);
 576                 if (urb->transfer_buffer != NULL)
 577                         usb_free_coherent(gspca_dev->dev,
 578                                           urb->transfer_buffer_length,
 579                                           urb->transfer_buffer,
 580                                           urb->transfer_dma);
 581                 usb_free_urb(urb);
 582         }
 583 }
 584
 585 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 586 {
 587         int ret;
 588
 589         if (gspca_dev->alt == 0)
 590                 return 0;
 591         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 592         if (ret < 0)
 593                 err("set alt 0 err %d", ret);
 594         return ret;
 595 }
 596
 597 /* Note: both the queue and the usb locks should be held when calling this */
 598 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 599 {
 600         gspca_dev->streaming = 0;
 601         if (gspca_dev->present) {
 602                 if (gspca_dev->sd_desc->stopN)
 603                         gspca_dev->sd_desc->stopN(gspca_dev);
 604                 destroy_urbs(gspca_dev);
 605                 gspca_input_destroy_urb(gspca_dev);
 606                 gspca_set_alt0(gspca_dev);
 607                 gspca_input_create_urb(gspca_dev);
 608         }
 609
 610         /* always call stop0 to free the subdriver's resources */
 611         if (gspca_dev->sd_desc->stop0)
 612                 gspca_dev->sd_desc->stop0(gspca_dev);
 613         PDEBUG(D_STREAM, "stream off OK");
 614 }
 615
 616 /*
 617  * look for an input transfer endpoint in an alternate setting
 618  */
 619 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 620                                           int xfer)
 621 {
 622         struct usb_host_endpoint *ep;
 623         int i, attr;
 624
 625         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 626                 ep = &alt->endpoint[i];
 627                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 628                 if (attr == xfer
 629                     && ep->desc.wMaxPacketSize != 0)
 630                         return ep;
 631         }
 632         return NULL;
 633 }
 634
 635 /*
 636  * look for an input (isoc or bulk) endpoint
 637  *
 638  * The endpoint is defined by the subdriver.
 639  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 640  * This routine may be called many times when the bandwidth is too small
 641  * (the bandwidth is checked on urb submit).
 642  */
 643 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 644 {
 645         struct usb_interface *intf;
 646         struct usb_host_endpoint *ep;
 647         int xfer, i, ret;
 648
 649         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 650         ep = NULL;
 651         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 652                                    : USB_ENDPOINT_XFER_ISOC;
 653         i = gspca_dev->alt;                     /* previous alt setting */
 654         if (gspca_dev->cam.reverse_alts) {
 655                 while (++i < gspca_dev->nbalt) {
 656                         ep = alt_xfer(&intf->altsetting[i], xfer);
 657                         if (ep)
 658                                 break;
 659                 }
 660         } else {
 661                 while (--i >= 0) {
 662                         ep = alt_xfer(&intf->altsetting[i], xfer);
 663                         if (ep)
 664                                 break;
 665                 }
 666         }
 667         if (ep == NULL) {
 668                 err("no transfer endpoint found");
 669                 return NULL;
 670         }
 671         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 672                         i, ep->desc.bEndpointAddress);
 673         gspca_dev->alt = i;             /* memorize the current alt setting */
 674         if (gspca_dev->nbalt > 1) {
 675                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 676                 if (ret < 0) {
 677                         err("set alt %d err %d", i, ret);
 678                         ep = NULL;
 679                 }
 680         }
 681         return ep;
 682 }
 683
 684 /*
 685  * create the URBs for image transfer
 686  */
 687 static int create_urbs(struct gspca_dev *gspca_dev,
 688                         struct usb_host_endpoint *ep)
 689 {
 690         struct urb *urb;
 691         int n, nurbs, i, psize, npkt, bsize;
 692
 693         /* calculate the packet size and the number of packets */
 694         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 695
 696         if (!gspca_dev->cam.bulk) {             /* isoc */
 697
 698                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 699                 if (gspca_dev->pkt_size == 0)
 700                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 701                 else
 702                         psize = gspca_dev->pkt_size;
 703                 npkt = gspca_dev->cam.npkt;
 704                 if (npkt == 0)
 705                         npkt = 32;              /* default value */
 706                 bsize = psize * npkt;
 707                 PDEBUG(D_STREAM,
 708                         "isoc %d pkts size %d = bsize:%d",
 709                         npkt, psize, bsize);
 710                 nurbs = DEF_NURBS;
 711         } else {                                /* bulk */
 712                 npkt = 0;
 713                 bsize = gspca_dev->cam.bulk_size;
 714                 if (bsize == 0)
 715                         bsize = psize;
 716                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 717                 if (gspca_dev->cam.bulk_nurbs != 0)
 718                         nurbs = gspca_dev->cam.bulk_nurbs;
 719                 else
 720                         nurbs = 1;
 721         }
 722
 723         for (n = 0; n < nurbs; n++) {
 724                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 725                 if (!urb) {
 726                         err("usb_alloc_urb failed");
 727                         return -ENOMEM;
 728                 }
 729                 gspca_dev->urb[n] = urb;
 730                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 731                                                 bsize,
 732                                                 GFP_KERNEL,
 733                                                 &urb->transfer_dma);
 734
 735                 if (urb->transfer_buffer == NULL) {
 736                         err("usb_alloc_coherent failed");
 737                         return -ENOMEM;
 738                 }
 739                 urb->dev = gspca_dev->dev;
 740                 urb->context = gspca_dev;
 741                 urb->transfer_buffer_length = bsize;
 742                 if (npkt != 0) {                /* ISOC */
 743                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 744                                                     ep->desc.bEndpointAddress);
 745                         urb->transfer_flags = URB_ISO_ASAP
 746                                         | URB_NO_TRANSFER_DMA_MAP;
 747                         urb->interval = ep->desc.bInterval;
 748                         urb->complete = isoc_irq;
 749                         urb->number_of_packets = npkt;
 750                         for (i = 0; i < npkt; i++) {
 751                                 urb->iso_frame_desc[i].length = psize;
 752                                 urb->iso_frame_desc[i].offset = psize * i;
 753                         }
 754                 } else {                /* bulk */
 755                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 756                                                 ep->desc.bEndpointAddress);
 757                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 758                         urb->complete = bulk_irq;
 759                 }
 760         }
 761         return 0;
 762 }
 763
 764 /*
 765  * start the USB transfer
 766  */
 767 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 768 {
 769         struct usb_host_endpoint *ep;
 770         struct urb *urb;
 771         int n, ret;
 772
 773         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 774                 return -ERESTARTSYS;
 775
 776         if (!gspca_dev->present) {
 777                 ret = -ENODEV;
 778                 goto unlock;
 779         }
 780
 781         /* reset the streaming variables */
 782         gspca_dev->image = NULL;
 783         gspca_dev->image_len = 0;
 784         gspca_dev->last_packet_type = DISCARD_PACKET;
 785         gspca_dev->sequence = 0;
 786
 787         gspca_dev->usb_err = 0;
 788
 789         /* set the higher alternate setting and
 790          * loop until urb submit succeeds */
 791         if (gspca_dev->cam.reverse_alts)
 792                 gspca_dev->alt = 0;
 793         else
 794                 gspca_dev->alt = gspca_dev->nbalt;
 795
 796         if (gspca_dev->sd_desc->isoc_init) {
 797                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 798                 if (ret < 0)
 799                         goto unlock;
 800         }
 801
 802         gspca_input_destroy_urb(gspca_dev);
 803         ep = get_ep(gspca_dev);
 804         if (ep == NULL) {
 805                 ret = -EIO;
 806                 goto out;
 807         }
 808         for (;;) {
 809                 if (!gspca_dev->cam.no_urb_create) {
 810                         PDEBUG(D_STREAM, "init transfer alt %d",
 811                                 gspca_dev->alt);
 812                         ret = create_urbs(gspca_dev, ep);
 813                         if (ret < 0) {
 814                                 destroy_urbs(gspca_dev);
 815                                 goto out;
 816                         }
 817                 }
 818
 819                 /* clear the bulk endpoint */
 820                 if (gspca_dev->cam.bulk)
 821                         usb_clear_halt(gspca_dev->dev,
 822                                         gspca_dev->urb[0]->pipe);
 823
 824                 /* start the cam */
 825                 ret = gspca_dev->sd_desc->start(gspca_dev);
 826                 if (ret < 0) {
 827                         destroy_urbs(gspca_dev);
 828                         goto out;
 829                 }
 830                 gspca_dev->streaming = 1;
 831
 832                 /* some bulk transfers are started by the subdriver */
 833                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 834                         break;
 835
 836                 /* submit the URBs */
 837                 for (n = 0; n < MAX_NURBS; n++) {
 838                         urb = gspca_dev->urb[n];
 839                         if (urb == NULL)
 840                                 break;
 841                         ret = usb_submit_urb(urb, GFP_KERNEL);
 842                         if (ret < 0)
 843                                 break;
 844                 }
 845                 if (ret >= 0)
 846                         break;
 847                 gspca_stream_off(gspca_dev);
 848                 if (ret != -ENOSPC) {
 849                         err("usb_submit_urb alt %d err %d",
 850                                 gspca_dev->alt, ret);
 851                         goto out;
 852                 }
 853
 854                 /* the bandwidth is not wide enough
 855                  * negociate or try a lower alternate setting */
 856                 PDEBUG(D_ERR|D_STREAM,
 857                         "bandwidth not wide enough - trying again");
 858                 msleep(20);     /* wait for kill complete */
 859                 if (gspca_dev->sd_desc->isoc_nego) {
 860                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 861                         if (ret < 0)
 862                                 goto out;
 863                 } else {
 864                         ep = get_ep(gspca_dev);
 865                         if (ep == NULL) {
 866                                 ret = -EIO;
 867                                 goto out;
 868                         }
 869                 }
 870         }
 871 out:
 872         gspca_input_create_urb(gspca_dev);
 873 unlock:
 874         mutex_unlock(&gspca_dev->usb_lock);
 875         return ret;
 876 }
 877
 878 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 879 {
 880         struct gspca_ctrl *ctrl;
 881         int i;
 882
 883         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 884         gspca_dev->curr_mode = i;
 885         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 886         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 887         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 888
 889         /* set the current control values to their default values
 890          * which may have changed in sd_init() */
 891         ctrl = gspca_dev->cam.ctrls;
 892         if (ctrl != NULL) {
 893                 for (i = 0;
 894                      i < gspca_dev->sd_desc->nctrls;
 895                      i++, ctrl++)
 896                         ctrl->val = ctrl->def;
 897         }
 898 }
 899
 900 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 901                         int width, int height)
 902 {
 903         int i;
 904
 905         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 906                 if (width >= gspca_dev->cam.cam_mode[i].width
 907                     && height >= gspca_dev->cam.cam_mode[i].height)
 908                         break;
 909         }
 910         return i;
 911 }
 912
 913 /*
 914  * search a mode with the right pixel format
 915  */
 916 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 917                         int mode,
 918                         int pixfmt)
 919 {
 920         int modeU, modeD;
 921
 922         modeU = modeD = mode;
 923         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 924                 if (--modeD >= 0) {
 925                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 926                                                                 == pixfmt)
 927                                 return modeD;
 928                 }
 929                 if (++modeU < gspca_dev->cam.nmodes) {
 930                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 931                                                                 == pixfmt)
 932                                 return modeU;
 933                 }
 934         }
 935         return -EINVAL;
 936 }
 937
 938 #ifdef CONFIG_VIDEO_ADV_DEBUG
 939 static int vidioc_g_register(struct file *file, void *priv,
 940                         struct v4l2_dbg_register *reg)
 941 {
 942         int ret;
 943         struct gspca_dev *gspca_dev = priv;
 944
 945         if (!gspca_dev->sd_desc->get_chip_ident)
 946                 return -EINVAL;
 947
 948         if (!gspca_dev->sd_desc->get_register)
 949                 return -EINVAL;
 950
 951         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 952                 return -ERESTARTSYS;
 953         gspca_dev->usb_err = 0;
 954         if (gspca_dev->present)
 955                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 956         else
 957                 ret = -ENODEV;
 958         mutex_unlock(&gspca_dev->usb_lock);
 959
 960         return ret;
 961 }
 962
 963 static int vidioc_s_register(struct file *file, void *priv,
 964                         struct v4l2_dbg_register *reg)
 965 {
 966         int ret;
 967         struct gspca_dev *gspca_dev = priv;
 968
 969         if (!gspca_dev->sd_desc->get_chip_ident)
 970                 return -EINVAL;
 971
 972         if (!gspca_dev->sd_desc->set_register)
 973                 return -EINVAL;
 974
 975         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 976                 return -ERESTARTSYS;
 977         gspca_dev->usb_err = 0;
 978         if (gspca_dev->present)
 979                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 980         else
 981                 ret = -ENODEV;
 982         mutex_unlock(&gspca_dev->usb_lock);
 983
 984         return ret;
 985 }
 986 #endif
 987
 988 static int vidioc_g_chip_ident(struct file *file, void *priv,
 989                         struct v4l2_dbg_chip_ident *chip)
 990 {
 991         int ret;
 992         struct gspca_dev *gspca_dev = priv;
 993
 994         if (!gspca_dev->sd_desc->get_chip_ident)
 995                 return -EINVAL;
 996
 997         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 998                 return -ERESTARTSYS;
 999         gspca_dev->usb_err = 0;
1000         if (gspca_dev->present)
1001                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1002         else
1003                 ret = -ENODEV;
1004         mutex_unlock(&gspca_dev->usb_lock);
1005
1006         return ret;
1007 }
1008
1009 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1010                                 struct v4l2_fmtdesc *fmtdesc)
1011 {
1012         struct gspca_dev *gspca_dev = priv;
1013         int i, j, index;
1014         __u32 fmt_tb[8];
1015
1016         /* give an index to each format */
1017         index = 0;
1018         j = 0;
1019         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1020                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1021                 j = 0;
1022                 for (;;) {
1023                         if (fmt_tb[j] == fmt_tb[index])
1024                                 break;
1025                         j++;
1026                 }
1027                 if (j == index) {
1028                         if (fmtdesc->index == index)
1029                                 break;          /* new format */
1030                         index++;
1031                         if (index >= ARRAY_SIZE(fmt_tb))
1032                                 return -EINVAL;
1033                 }
1034         }
1035         if (i < 0)
1036                 return -EINVAL;         /* no more format */
1037
1038         fmtdesc->pixelformat = fmt_tb[index];
1039         if (gspca_is_compressed(fmt_tb[index]))
1040                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1041         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1042         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1043         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1044         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1045         fmtdesc->description[4] = '\0';
1046         return 0;
1047 }
1048
1049 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1050                             struct v4l2_format *fmt)
1051 {
1052         struct gspca_dev *gspca_dev = priv;
1053         int mode;
1054
1055         mode = gspca_dev->curr_mode;
1056         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1057                 sizeof fmt->fmt.pix);
1058         return 0;
1059 }
1060
1061 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1062                         struct v4l2_format *fmt)
1063 {
1064         int w, h, mode, mode2;
1065
1066         w = fmt->fmt.pix.width;
1067         h = fmt->fmt.pix.height;
1068
1069 #ifdef GSPCA_DEBUG
1070         if (gspca_debug & D_CONF)
1071                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1072 #endif
1073         /* search the closest mode for width and height */
1074         mode = wxh_to_mode(gspca_dev, w, h);
1075
1076         /* OK if right palette */
1077         if (gspca_dev->cam.cam_mode[mode].pixelformat
1078                                                 != fmt->fmt.pix.pixelformat) {
1079
1080                 /* else, search the closest mode with the same pixel format */
1081                 mode2 = gspca_get_mode(gspca_dev, mode,
1082                                         fmt->fmt.pix.pixelformat);
1083                 if (mode2 >= 0)
1084                         mode = mode2;
1085 /*              else
1086                         ;                * no chance, return this mode */
1087         }
1088         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1089                 sizeof fmt->fmt.pix);
1090         return mode;                    /* used when s_fmt */
1091 }
1092
1093 static int vidioc_try_fmt_vid_cap(struct file *file,
1094                               void *priv,
1095                               struct v4l2_format *fmt)
1096 {
1097         struct gspca_dev *gspca_dev = priv;
1098         int ret;
1099
1100         ret = try_fmt_vid_cap(gspca_dev, fmt);
1101         if (ret < 0)
1102                 return ret;
1103         return 0;
1104 }
1105
1106 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1107                             struct v4l2_format *fmt)
1108 {
1109         struct gspca_dev *gspca_dev = priv;
1110         int ret;
1111
1112         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1113                 return -ERESTARTSYS;
1114
1115         ret = try_fmt_vid_cap(gspca_dev, fmt);
1116         if (ret < 0)
1117                 goto out;
1118
1119         if (gspca_dev->nframes != 0
1120             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1121                 ret = -EINVAL;
1122                 goto out;
1123         }
1124
1125         if (ret == gspca_dev->curr_mode) {
1126                 ret = 0;
1127                 goto out;                       /* same mode */
1128         }
1129
1130         if (gspca_dev->streaming) {
1131                 ret = -EBUSY;
1132                 goto out;
1133         }
1134         gspca_dev->width = fmt->fmt.pix.width;
1135         gspca_dev->height = fmt->fmt.pix.height;
1136         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1137         gspca_dev->curr_mode = ret;
1138
1139         ret = 0;
1140 out:
1141         mutex_unlock(&gspca_dev->queue_lock);
1142         return ret;
1143 }
1144
1145 static int vidioc_enum_framesizes(struct file *file, void *priv,
1146                                   struct v4l2_frmsizeenum *fsize)
1147 {
1148         struct gspca_dev *gspca_dev = priv;
1149         int i;
1150         __u32 index = 0;
1151
1152         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1153                 if (fsize->pixel_format !=
1154                                 gspca_dev->cam.cam_mode[i].pixelformat)
1155                         continue;
1156
1157                 if (fsize->index == index) {
1158                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1159                         fsize->discrete.width =
1160                                 gspca_dev->cam.cam_mode[i].width;
1161                         fsize->discrete.height =
1162                                 gspca_dev->cam.cam_mode[i].height;
1163                         return 0;
1164                 }
1165                 index++;
1166         }
1167
1168         return -EINVAL;
1169 }
1170
1171 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1172                                       struct v4l2_frmivalenum *fival)
1173 {
1174         struct gspca_dev *gspca_dev = priv;
1175         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1176         __u32 i;
1177
1178         if (gspca_dev->cam.mode_framerates == NULL ||
1179                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1180                 return -EINVAL;
1181
1182         if (fival->pixel_format !=
1183                         gspca_dev->cam.cam_mode[mode].pixelformat)
1184                 return -EINVAL;
1185
1186         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1187                 if (fival->index == i) {
1188                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1189                         fival->discrete.numerator = 1;
1190                         fival->discrete.denominator =
1191                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1192                         return 0;
1193                 }
1194         }
1195
1196         return -EINVAL;
1197 }
1198
1199 static void gspca_release(struct video_device *vfd)
1200 {
1201         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1202
1203         PDEBUG(D_PROBE, "%s released",
1204                 video_device_node_name(&gspca_dev->vdev));
1205
1206         kfree(gspca_dev->usb_buf);
1207         kfree(gspca_dev);
1208 }
1209
1210 static int dev_open(struct file *file)
1211 {
1212         struct gspca_dev *gspca_dev;
1213
1214         PDEBUG(D_STREAM, "[%s] open", current->comm);
1215         gspca_dev = (struct gspca_dev *) video_devdata(file);
1216         if (!gspca_dev->present)
1217                 return -ENODEV;
1218
1219         /* protect the subdriver against rmmod */
1220         if (!try_module_get(gspca_dev->module))
1221                 return -ENODEV;
1222
1223         file->private_data = gspca_dev;
1224 #ifdef GSPCA_DEBUG
1225         /* activate the v4l2 debug */
1226         if (gspca_debug & D_V4L2)
1227                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1228                                         | V4L2_DEBUG_IOCTL_ARG;
1229         else
1230                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1231                                         | V4L2_DEBUG_IOCTL_ARG);
1232 #endif
1233         return 0;
1234 }
1235
1236 static int dev_close(struct file *file)
1237 {
1238         struct gspca_dev *gspca_dev = file->private_data;
1239
1240         PDEBUG(D_STREAM, "[%s] close", current->comm);
1241         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1242                 return -ERESTARTSYS;
1243
1244         /* if the file did the capture, free the streaming resources */
1245         if (gspca_dev->capt_file == file) {
1246                 if (gspca_dev->streaming) {
1247                         mutex_lock(&gspca_dev->usb_lock);
1248                         gspca_dev->usb_err = 0;
1249                         gspca_stream_off(gspca_dev);
1250                         mutex_unlock(&gspca_dev->usb_lock);
1251                 }
1252                 frame_free(gspca_dev);
1253                 gspca_dev->capt_file = NULL;
1254                 gspca_dev->memory = GSPCA_MEMORY_NO;
1255         }
1256         file->private_data = NULL;
1257         module_put(gspca_dev->module);
1258         mutex_unlock(&gspca_dev->queue_lock);
1259
1260         PDEBUG(D_STREAM, "close done");
1261
1262         return 0;
1263 }
1264
1265 static int vidioc_querycap(struct file *file, void  *priv,
1266                            struct v4l2_capability *cap)
1267 {
1268         struct gspca_dev *gspca_dev = priv;
1269         int ret;
1270
1271         /* protect the access to the usb device */
1272         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1273                 return -ERESTARTSYS;
1274         if (!gspca_dev->present) {
1275                 ret = -ENODEV;
1276                 goto out;
1277         }
1278         strncpy((char *) cap->driver, gspca_dev->sd_desc->name,
1279                         sizeof cap->driver);
1280         if (gspca_dev->dev->product != NULL) {
1281                 strncpy((char *) cap->card, gspca_dev->dev->product,
1282                         sizeof cap->card);
1283         } else {
1284                 snprintf((char *) cap->card, sizeof cap->card,
1285                         "USB Camera (%04x:%04x)",
1286                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1287                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1288         }
1289         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1290                         sizeof(cap->bus_info));
1291         cap->version = DRIVER_VERSION_NUMBER;
1292         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1293                           | V4L2_CAP_STREAMING
1294                           | V4L2_CAP_READWRITE;
1295         ret = 0;
1296 out:
1297         mutex_unlock(&gspca_dev->usb_lock);
1298         return ret;
1299 }
1300
1301 static int get_ctrl(struct gspca_dev *gspca_dev,
1302                                    int id)
1303 {
1304         const struct ctrl *ctrls;
1305         int i;
1306
1307         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1308              i < gspca_dev->sd_desc->nctrls;
1309              i++, ctrls++) {
1310                 if (gspca_dev->ctrl_dis & (1 << i))
1311                         continue;
1312                 if (id == ctrls->qctrl.id)
1313                         return i;
1314         }
1315         return -1;
1316 }
1317
1318 static int vidioc_queryctrl(struct file *file, void *priv,
1319                            struct v4l2_queryctrl *q_ctrl)
1320 {
1321         struct gspca_dev *gspca_dev = priv;
1322         const struct ctrl *ctrls;
1323         struct gspca_ctrl *gspca_ctrl;
1324         int i, idx;
1325         u32 id;
1326
1327         id = q_ctrl->id;
1328         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1329                 id &= V4L2_CTRL_ID_MASK;
1330                 id++;
1331                 idx = -1;
1332                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1333                         if (gspca_dev->ctrl_dis & (1 << i))
1334                                 continue;
1335                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1336                                 continue;
1337                         if (idx >= 0
1338                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1339                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1340                                 continue;
1341                         idx = i;
1342                 }
1343         } else {
1344                 idx = get_ctrl(gspca_dev, id);
1345         }
1346         if (idx < 0)
1347                 return -EINVAL;
1348         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1349         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1350         if (gspca_dev->cam.ctrls != NULL) {
1351                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1352                 q_ctrl->default_value = gspca_ctrl->def;
1353                 q_ctrl->minimum = gspca_ctrl->min;
1354                 q_ctrl->maximum = gspca_ctrl->max;
1355         }
1356         if (gspca_dev->ctrl_inac & (1 << idx))
1357                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1358         return 0;
1359 }
1360
1361 static int vidioc_s_ctrl(struct file *file, void *priv,
1362                          struct v4l2_control *ctrl)
1363 {
1364         struct gspca_dev *gspca_dev = priv;
1365         const struct ctrl *ctrls;
1366         struct gspca_ctrl *gspca_ctrl;
1367         int idx, ret;
1368
1369         idx = get_ctrl(gspca_dev, ctrl->id);
1370         if (idx < 0)
1371                 return -EINVAL;
1372         if (gspca_dev->ctrl_inac & (1 << idx))
1373                 return -EINVAL;
1374         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1375         if (gspca_dev->cam.ctrls != NULL) {
1376                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1377                 if (ctrl->value < gspca_ctrl->min
1378                     || ctrl->value > gspca_ctrl->max)
1379                         return -ERANGE;
1380         } else {
1381                 gspca_ctrl = NULL;
1382                 if (ctrl->value < ctrls->qctrl.minimum
1383                     || ctrl->value > ctrls->qctrl.maximum)
1384                         return -ERANGE;
1385         }
1386         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1387         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1388                 return -ERESTARTSYS;
1389         if (!gspca_dev->present) {
1390                 ret = -ENODEV;
1391                 goto out;
1392         }
1393         gspca_dev->usb_err = 0;
1394         if (ctrls->set != NULL) {
1395                 ret = ctrls->set(gspca_dev, ctrl->value);
1396                 goto out;
1397         }
1398         if (gspca_ctrl != NULL) {
1399                 gspca_ctrl->val = ctrl->value;
1400                 if (ctrls->set_control != NULL
1401                  && gspca_dev->streaming)
1402                         ctrls->set_control(gspca_dev);
1403         }
1404         ret = gspca_dev->usb_err;
1405 out:
1406         mutex_unlock(&gspca_dev->usb_lock);
1407         return ret;
1408 }
1409
1410 static int vidioc_g_ctrl(struct file *file, void *priv,
1411                          struct v4l2_control *ctrl)
1412 {
1413         struct gspca_dev *gspca_dev = priv;
1414         const struct ctrl *ctrls;
1415         int idx, ret;
1416
1417         idx = get_ctrl(gspca_dev, ctrl->id);
1418         if (idx < 0)
1419                 return -EINVAL;
1420         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1421
1422         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1423                 return -ERESTARTSYS;
1424         if (!gspca_dev->present) {
1425                 ret = -ENODEV;
1426                 goto out;
1427         }
1428         gspca_dev->usb_err = 0;
1429         if (ctrls->get != NULL) {
1430                 ret = ctrls->get(gspca_dev, &ctrl->value);
1431                 goto out;
1432         }
1433         if (gspca_dev->cam.ctrls != NULL)
1434                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1435         ret = 0;
1436 out:
1437         mutex_unlock(&gspca_dev->usb_lock);
1438         return ret;
1439 }
1440
1441 static int vidioc_querymenu(struct file *file, void *priv,
1442                             struct v4l2_querymenu *qmenu)
1443 {
1444         struct gspca_dev *gspca_dev = priv;
1445
1446         if (!gspca_dev->sd_desc->querymenu)
1447                 return -EINVAL;
1448         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1449 }
1450
1451 static int vidioc_enum_input(struct file *file, void *priv,
1452                                 struct v4l2_input *input)
1453 {
1454         struct gspca_dev *gspca_dev = priv;
1455
1456         if (input->index != 0)
1457                 return -EINVAL;
1458         input->type = V4L2_INPUT_TYPE_CAMERA;
1459         input->status = gspca_dev->cam.input_flags;
1460         strncpy(input->name, gspca_dev->sd_desc->name,
1461                 sizeof input->name);
1462         return 0;
1463 }
1464
1465 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1466 {
1467         *i = 0;
1468         return 0;
1469 }
1470
1471 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1472 {
1473         if (i > 0)
1474                 return -EINVAL;
1475         return (0);
1476 }
1477
1478 static int vidioc_reqbufs(struct file *file, void *priv,
1479                           struct v4l2_requestbuffers *rb)
1480 {
1481         struct gspca_dev *gspca_dev = priv;
1482         int i, ret = 0, streaming;
1483
1484         i = rb->memory;                 /* (avoid compilation warning) */
1485         switch (i) {
1486         case GSPCA_MEMORY_READ:                 /* (internal call) */
1487         case V4L2_MEMORY_MMAP:
1488         case V4L2_MEMORY_USERPTR:
1489                 break;
1490         default:
1491                 return -EINVAL;
1492         }
1493         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1494                 return -ERESTARTSYS;
1495
1496         if (gspca_dev->memory != GSPCA_MEMORY_NO
1497             && gspca_dev->memory != rb->memory) {
1498                 ret = -EBUSY;
1499                 goto out;
1500         }
1501
1502         /* only one file may do the capture */
1503         if (gspca_dev->capt_file != NULL
1504             && gspca_dev->capt_file != file) {
1505                 ret = -EBUSY;
1506                 goto out;
1507         }
1508
1509         /* if allocated, the buffers must not be mapped */
1510         for (i = 0; i < gspca_dev->nframes; i++) {
1511                 if (gspca_dev->frame[i].vma_use_count) {
1512                         ret = -EBUSY;
1513                         goto out;
1514                 }
1515         }
1516
1517         /* stop streaming */
1518         streaming = gspca_dev->streaming;
1519         if (streaming) {
1520                 mutex_lock(&gspca_dev->usb_lock);
1521                 gspca_dev->usb_err = 0;
1522                 gspca_stream_off(gspca_dev);
1523                 mutex_unlock(&gspca_dev->usb_lock);
1524         }
1525
1526         /* free the previous allocated buffers, if any */
1527         if (gspca_dev->nframes != 0) {
1528                 frame_free(gspca_dev);
1529                 gspca_dev->capt_file = NULL;
1530         }
1531         if (rb->count == 0)                     /* unrequest */
1532                 goto out;
1533         gspca_dev->memory = rb->memory;
1534         ret = frame_alloc(gspca_dev, rb->count);
1535         if (ret == 0) {
1536                 rb->count = gspca_dev->nframes;
1537                 gspca_dev->capt_file = file;
1538                 if (streaming)
1539                         ret = gspca_init_transfer(gspca_dev);
1540         }
1541 out:
1542         mutex_unlock(&gspca_dev->queue_lock);
1543         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1544         return ret;
1545 }
1546
1547 static int vidioc_querybuf(struct file *file, void *priv,
1548                            struct v4l2_buffer *v4l2_buf)
1549 {
1550         struct gspca_dev *gspca_dev = priv;
1551         struct gspca_frame *frame;
1552
1553         if (v4l2_buf->index < 0
1554             || v4l2_buf->index >= gspca_dev->nframes)
1555                 return -EINVAL;
1556
1557         frame = &gspca_dev->frame[v4l2_buf->index];
1558         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1559         return 0;
1560 }
1561
1562 static int vidioc_streamon(struct file *file, void *priv,
1563                            enum v4l2_buf_type buf_type)
1564 {
1565         struct gspca_dev *gspca_dev = priv;
1566         int ret;
1567
1568         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1569                 return -EINVAL;
1570         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1571                 return -ERESTARTSYS;
1572
1573         /* check the capture file */
1574         if (gspca_dev->capt_file != file) {
1575                 ret = -EBUSY;
1576                 goto out;
1577         }
1578
1579         if (gspca_dev->nframes == 0
1580             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1581                 ret = -EINVAL;
1582                 goto out;
1583         }
1584         if (!gspca_dev->streaming) {
1585                 ret = gspca_init_transfer(gspca_dev);
1586                 if (ret < 0)
1587                         goto out;
1588         }
1589 #ifdef GSPCA_DEBUG
1590         if (gspca_debug & D_STREAM) {
1591                 PDEBUG_MODE("stream on OK",
1592                         gspca_dev->pixfmt,
1593                         gspca_dev->width,
1594                         gspca_dev->height);
1595         }
1596 #endif
1597         ret = 0;
1598 out:
1599         mutex_unlock(&gspca_dev->queue_lock);
1600         return ret;
1601 }
1602
1603 static int vidioc_streamoff(struct file *file, void *priv,
1604                                 enum v4l2_buf_type buf_type)
1605 {
1606         struct gspca_dev *gspca_dev = priv;
1607         int ret;
1608
1609         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1610                 return -EINVAL;
1611
1612         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1613                 return -ERESTARTSYS;
1614
1615         if (!gspca_dev->streaming) {
1616                 ret = 0;
1617                 goto out;
1618         }
1619
1620         /* check the capture file */
1621         if (gspca_dev->capt_file != file) {
1622                 ret = -EBUSY;
1623                 goto out;
1624         }
1625
1626         /* stop streaming */
1627         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1628                 ret = -ERESTARTSYS;
1629                 goto out;
1630         }
1631         gspca_dev->usb_err = 0;
1632         gspca_stream_off(gspca_dev);
1633         mutex_unlock(&gspca_dev->usb_lock);
1634
1635         /* empty the transfer queues */
1636         atomic_set(&gspca_dev->fr_q, 0);
1637         atomic_set(&gspca_dev->fr_i, 0);
1638         gspca_dev->fr_o = 0;
1639         ret = 0;
1640 out:
1641         mutex_unlock(&gspca_dev->queue_lock);
1642         return ret;
1643 }
1644
1645 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1646                         struct v4l2_jpegcompression *jpegcomp)
1647 {
1648         struct gspca_dev *gspca_dev = priv;
1649         int ret;
1650
1651         if (!gspca_dev->sd_desc->get_jcomp)
1652                 return -EINVAL;
1653         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1654                 return -ERESTARTSYS;
1655         gspca_dev->usb_err = 0;
1656         if (gspca_dev->present)
1657                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1658         else
1659                 ret = -ENODEV;
1660         mutex_unlock(&gspca_dev->usb_lock);
1661         return ret;
1662 }
1663
1664 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1665                         struct v4l2_jpegcompression *jpegcomp)
1666 {
1667         struct gspca_dev *gspca_dev = priv;
1668         int ret;
1669
1670         if (!gspca_dev->sd_desc->set_jcomp)
1671                 return -EINVAL;
1672         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1673                 return -ERESTARTSYS;
1674         gspca_dev->usb_err = 0;
1675         if (gspca_dev->present)
1676                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1677         else
1678                 ret = -ENODEV;
1679         mutex_unlock(&gspca_dev->usb_lock);
1680         return ret;
1681 }
1682
1683 static int vidioc_g_parm(struct file *filp, void *priv,
1684                         struct v4l2_streamparm *parm)
1685 {
1686         struct gspca_dev *gspca_dev = priv;
1687
1688         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1689
1690         if (gspca_dev->sd_desc->get_streamparm) {
1691                 int ret;
1692
1693                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1694                         return -ERESTARTSYS;
1695                 if (gspca_dev->present) {
1696                         gspca_dev->usb_err = 0;
1697                         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1698                         ret = gspca_dev->usb_err;
1699                 } else {
1700                         ret = -ENODEV;
1701                 }
1702                 mutex_unlock(&gspca_dev->usb_lock);
1703                 return ret;
1704         }
1705
1706         return 0;
1707 }
1708
1709 static int vidioc_s_parm(struct file *filp, void *priv,
1710                         struct v4l2_streamparm *parm)
1711 {
1712         struct gspca_dev *gspca_dev = priv;
1713         int n;
1714
1715         n = parm->parm.capture.readbuffers;
1716         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1717                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1718         else
1719                 gspca_dev->nbufread = n;
1720
1721         if (gspca_dev->sd_desc->set_streamparm) {
1722                 int ret;
1723
1724                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1725                         return -ERESTARTSYS;
1726                 if (gspca_dev->present) {
1727                         gspca_dev->usb_err = 0;
1728                         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1729                         ret = gspca_dev->usb_err;
1730                 } else {
1731                         ret = -ENODEV;
1732                 }
1733                 mutex_unlock(&gspca_dev->usb_lock);
1734                 return ret;
1735         }
1736
1737         return 0;
1738 }
1739
1740 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1741 {
1742         struct gspca_dev *gspca_dev = file->private_data;
1743         struct gspca_frame *frame;
1744         struct page *page;
1745         unsigned long addr, start, size;
1746         int i, ret;
1747
1748         start = vma->vm_start;
1749         size = vma->vm_end - vma->vm_start;
1750         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1751
1752         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1753                 return -ERESTARTSYS;
1754         if (!gspca_dev->present) {
1755                 ret = -ENODEV;
1756                 goto out;
1757         }
1758         if (gspca_dev->capt_file != file) {
1759                 ret = -EINVAL;
1760                 goto out;
1761         }
1762
1763         frame = NULL;
1764         for (i = 0; i < gspca_dev->nframes; ++i) {
1765                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1766                         PDEBUG(D_STREAM, "mmap bad memory type");
1767                         break;
1768                 }
1769                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1770                                                 == vma->vm_pgoff) {
1771                         frame = &gspca_dev->frame[i];
1772                         break;
1773                 }
1774         }
1775         if (frame == NULL) {
1776                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1777                 ret = -EINVAL;
1778                 goto out;
1779         }
1780         if (size != frame->v4l2_buf.length) {
1781                 PDEBUG(D_STREAM, "mmap bad size");
1782                 ret = -EINVAL;
1783                 goto out;
1784         }
1785
1786         /*
1787          * - VM_IO marks the area as being a mmaped region for I/O to a
1788          *   device. It also prevents the region from being core dumped.
1789          */
1790         vma->vm_flags |= VM_IO;
1791
1792         addr = (unsigned long) frame->data;
1793         while (size > 0) {
1794                 page = vmalloc_to_page((void *) addr);
1795                 ret = vm_insert_page(vma, start, page);
1796                 if (ret < 0)
1797                         goto out;
1798                 start += PAGE_SIZE;
1799                 addr += PAGE_SIZE;
1800                 size -= PAGE_SIZE;
1801         }
1802
1803         vma->vm_ops = &gspca_vm_ops;
1804         vma->vm_private_data = frame;
1805         gspca_vm_open(vma);
1806         ret = 0;
1807 out:
1808         mutex_unlock(&gspca_dev->queue_lock);
1809         return ret;
1810 }
1811
1812 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1813                                 enum v4l2_memory memory)
1814 {
1815         if (!gspca_dev->present)
1816                 return -ENODEV;
1817         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1818                         !gspca_dev->streaming)
1819                 return -EINVAL;
1820
1821         /* check if a frame is ready */
1822         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1823 }
1824
1825 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1826                         enum v4l2_memory memory)
1827 {
1828         int ret;
1829
1830         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1831                 return -ERESTARTSYS;
1832         ret = frame_ready_nolock(gspca_dev, file, memory);
1833         mutex_unlock(&gspca_dev->queue_lock);
1834         return ret;
1835 }
1836
1837 /*
1838  * dequeue a video buffer
1839  *
1840  * If nonblock_ing is false, block until a buffer is available.
1841  */
1842 static int vidioc_dqbuf(struct file *file, void *priv,
1843                         struct v4l2_buffer *v4l2_buf)
1844 {
1845         struct gspca_dev *gspca_dev = priv;
1846         struct gspca_frame *frame;
1847         int i, j, ret;
1848
1849         PDEBUG(D_FRAM, "dqbuf");
1850
1851         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1852                 return -ERESTARTSYS;
1853
1854         for (;;) {
1855                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1856                 if (ret < 0)
1857                         goto out;
1858                 if (ret > 0)
1859                         break;
1860
1861                 mutex_unlock(&gspca_dev->queue_lock);
1862
1863                 if (file->f_flags & O_NONBLOCK)
1864                         return -EAGAIN;
1865
1866                 /* wait till a frame is ready */
1867                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1868                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1869                         msecs_to_jiffies(3000));
1870                 if (ret < 0)
1871                         return ret;
1872                 if (ret == 0)
1873                         return -EIO;
1874
1875                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1876                         return -ERESTARTSYS;
1877         }
1878
1879         i = gspca_dev->fr_o;
1880         j = gspca_dev->fr_queue[i];
1881         frame = &gspca_dev->frame[j];
1882
1883         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1884
1885         if (gspca_dev->sd_desc->dq_callback) {
1886                 mutex_lock(&gspca_dev->usb_lock);
1887                 gspca_dev->usb_err = 0;
1888                 if (gspca_dev->present)
1889                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1890                 mutex_unlock(&gspca_dev->usb_lock);
1891         }
1892
1893         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1894         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1895         PDEBUG(D_FRAM, "dqbuf %d", j);
1896         ret = 0;
1897
1898         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1899                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1900                                  frame->data,
1901                                  frame->v4l2_buf.bytesused)) {
1902                         PDEBUG(D_ERR|D_STREAM,
1903                                 "dqbuf cp to user failed");
1904                         ret = -EFAULT;
1905                 }
1906         }
1907 out:
1908         mutex_unlock(&gspca_dev->queue_lock);
1909         return ret;
1910 }
1911
1912 /*
1913  * queue a video buffer
1914  *
1915  * Attempting to queue a buffer that has already been
1916  * queued will return -EINVAL.
1917  */
1918 static int vidioc_qbuf(struct file *file, void *priv,
1919                         struct v4l2_buffer *v4l2_buf)
1920 {
1921         struct gspca_dev *gspca_dev = priv;
1922         struct gspca_frame *frame;
1923         int i, index, ret;
1924
1925         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1926
1927         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1928                 return -ERESTARTSYS;
1929
1930         index = v4l2_buf->index;
1931         if ((unsigned) index >= gspca_dev->nframes) {
1932                 PDEBUG(D_FRAM,
1933                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1934                 ret = -EINVAL;
1935                 goto out;
1936         }
1937         if (v4l2_buf->memory != gspca_dev->memory) {
1938                 PDEBUG(D_FRAM, "qbuf bad memory type");
1939                 ret = -EINVAL;
1940                 goto out;
1941         }
1942
1943         frame = &gspca_dev->frame[index];
1944         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1945                 PDEBUG(D_FRAM, "qbuf bad state");
1946                 ret = -EINVAL;
1947                 goto out;
1948         }
1949
1950         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1951
1952         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1953                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1954                 frame->v4l2_buf.length = v4l2_buf->length;
1955         }
1956
1957         /* put the buffer in the 'queued' queue */
1958         i = atomic_read(&gspca_dev->fr_q);
1959         gspca_dev->fr_queue[i] = index;
1960         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1961
1962         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1963         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1964         ret = 0;
1965 out:
1966         mutex_unlock(&gspca_dev->queue_lock);
1967         return ret;
1968 }
1969
1970 /*
1971  * allocate the resources for read()
1972  */
1973 static int read_alloc(struct gspca_dev *gspca_dev,
1974                         struct file *file)
1975 {
1976         struct v4l2_buffer v4l2_buf;
1977         int i, ret;
1978
1979         PDEBUG(D_STREAM, "read alloc");
1980         if (gspca_dev->nframes == 0) {
1981                 struct v4l2_requestbuffers rb;
1982
1983                 memset(&rb, 0, sizeof rb);
1984                 rb.count = gspca_dev->nbufread;
1985                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1986                 rb.memory = GSPCA_MEMORY_READ;
1987                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1988                 if (ret != 0) {
1989                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1990                         return ret;
1991                 }
1992                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1993                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1994                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1995                 for (i = 0; i < gspca_dev->nbufread; i++) {
1996                         v4l2_buf.index = i;
1997                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1998                         if (ret != 0) {
1999                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2000                                 return ret;
2001                         }
2002                 }
2003                 gspca_dev->memory = GSPCA_MEMORY_READ;
2004         }
2005
2006         /* start streaming */
2007         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2008         if (ret != 0)
2009                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2010         return ret;
2011 }
2012
2013 static unsigned int dev_poll(struct file *file, poll_table *wait)
2014 {
2015         struct gspca_dev *gspca_dev = file->private_data;
2016         int ret;
2017
2018         PDEBUG(D_FRAM, "poll");
2019
2020         poll_wait(file, &gspca_dev->wq, wait);
2021
2022         /* if reqbufs is not done, the user would use read() */
2023         if (gspca_dev->nframes == 0) {
2024                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2025                         return POLLERR;         /* not the 1st time */
2026                 ret = read_alloc(gspca_dev, file);
2027                 if (ret != 0)
2028                         return POLLERR;
2029         }
2030
2031         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2032                 return POLLERR;
2033
2034         /* check if an image has been received */
2035         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2036                 ret = POLLIN | POLLRDNORM;      /* yes */
2037         else
2038                 ret = 0;
2039         mutex_unlock(&gspca_dev->queue_lock);
2040         if (!gspca_dev->present)
2041                 return POLLHUP;
2042         return ret;
2043 }
2044
2045 static ssize_t dev_read(struct file *file, char __user *data,
2046                     size_t count, loff_t *ppos)
2047 {
2048         struct gspca_dev *gspca_dev = file->private_data;
2049         struct gspca_frame *frame;
2050         struct v4l2_buffer v4l2_buf;
2051         struct timeval timestamp;
2052         int n, ret, ret2;
2053
2054         PDEBUG(D_FRAM, "read (%zd)", count);
2055         if (!gspca_dev->present)
2056                 return -ENODEV;
2057         switch (gspca_dev->memory) {
2058         case GSPCA_MEMORY_NO:                   /* first time */
2059                 ret = read_alloc(gspca_dev, file);
2060                 if (ret != 0)
2061                         return ret;
2062                 break;
2063         case GSPCA_MEMORY_READ:
2064                 if (gspca_dev->capt_file == file)
2065                         break;
2066                 /* fall thru */
2067         default:
2068                 return -EINVAL;
2069         }
2070
2071         /* get a frame */
2072         timestamp = ktime_to_timeval(ktime_get());
2073         timestamp.tv_sec--;
2074         n = 2;
2075         for (;;) {
2076                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2077                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2078                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2079                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2080                 if (ret != 0) {
2081                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2082                         return ret;
2083                 }
2084
2085                 /* if the process slept for more than 1 second,
2086                  * get a newer frame */
2087                 frame = &gspca_dev->frame[v4l2_buf.index];
2088                 if (--n < 0)
2089                         break;                  /* avoid infinite loop */
2090                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2091                         break;
2092                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2093                 if (ret != 0) {
2094                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2095                         return ret;
2096                 }
2097         }
2098
2099         /* copy the frame */
2100         if (count > frame->v4l2_buf.bytesused)
2101                 count = frame->v4l2_buf.bytesused;
2102         ret = copy_to_user(data, frame->data, count);
2103         if (ret != 0) {
2104                 PDEBUG(D_ERR|D_STREAM,
2105                         "read cp to user lack %d / %zd", ret, count);
2106                 ret = -EFAULT;
2107                 goto out;
2108         }
2109         ret = count;
2110 out:
2111         /* in each case, requeue the buffer */
2112         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2113         if (ret2 != 0)
2114                 return ret2;
2115         return ret;
2116 }
2117
2118 static struct v4l2_file_operations dev_fops = {
2119         .owner = THIS_MODULE,
2120         .open = dev_open,
2121         .release = dev_close,
2122         .read = dev_read,
2123         .mmap = dev_mmap,
2124         .unlocked_ioctl = video_ioctl2,
2125         .poll   = dev_poll,
2126 };
2127
2128 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2129         .vidioc_querycap        = vidioc_querycap,
2130         .vidioc_dqbuf           = vidioc_dqbuf,
2131         .vidioc_qbuf            = vidioc_qbuf,
2132         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2133         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2134         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2135         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2136         .vidioc_streamon        = vidioc_streamon,
2137         .vidioc_queryctrl       = vidioc_queryctrl,
2138         .vidioc_g_ctrl          = vidioc_g_ctrl,
2139         .vidioc_s_ctrl          = vidioc_s_ctrl,
2140         .vidioc_querymenu       = vidioc_querymenu,
2141         .vidioc_enum_input      = vidioc_enum_input,
2142         .vidioc_g_input         = vidioc_g_input,
2143         .vidioc_s_input         = vidioc_s_input,
2144         .vidioc_reqbufs         = vidioc_reqbufs,
2145         .vidioc_querybuf        = vidioc_querybuf,
2146         .vidioc_streamoff       = vidioc_streamoff,
2147         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2148         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2149         .vidioc_g_parm          = vidioc_g_parm,
2150         .vidioc_s_parm          = vidioc_s_parm,
2151         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2152         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2153 #ifdef CONFIG_VIDEO_ADV_DEBUG
2154         .vidioc_g_register      = vidioc_g_register,
2155         .vidioc_s_register      = vidioc_s_register,
2156 #endif
2157         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2158 };
2159
2160 static struct video_device gspca_template = {
2161         .name = "gspca main driver",
2162         .fops = &dev_fops,
2163         .ioctl_ops = &dev_ioctl_ops,
2164         .release = gspca_release,
2165 };
2166
2167 /* initialize the controls */
2168 static void ctrls_init(struct gspca_dev *gspca_dev)
2169 {
2170         struct gspca_ctrl *ctrl;
2171         int i;
2172
2173         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2174              i < gspca_dev->sd_desc->nctrls;
2175              i++, ctrl++) {
2176                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2177                 ctrl->val = ctrl->def;
2178                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2179                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2180         }
2181 }
2182
2183 /*
2184  * probe and create a new gspca device
2185  *
2186  * This function must be called by the sub-driver when it is
2187  * called for probing a new device.
2188  */
2189 int gspca_dev_probe2(struct usb_interface *intf,
2190                 const struct usb_device_id *id,
2191                 const struct sd_desc *sd_desc,
2192                 int dev_size,
2193                 struct module *module)
2194 {
2195         struct gspca_dev *gspca_dev;
2196         struct usb_device *dev = interface_to_usbdev(intf);
2197         int ret;
2198
2199         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2200
2201         /* create the device */
2202         if (dev_size < sizeof *gspca_dev)
2203                 dev_size = sizeof *gspca_dev;
2204         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2205         if (!gspca_dev) {
2206                 err("couldn't kzalloc gspca struct");
2207                 return -ENOMEM;
2208         }
2209         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2210         if (!gspca_dev->usb_buf) {
2211                 err("out of memory");
2212                 ret = -ENOMEM;
2213                 goto out;
2214         }
2215         gspca_dev->dev = dev;
2216         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2217         gspca_dev->nbalt = intf->num_altsetting;
2218
2219         /* check if any audio device */
2220         if (dev->config->desc.bNumInterfaces != 1) {
2221                 int i;
2222                 struct usb_interface *intf2;
2223
2224                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2225                         intf2 = dev->config->interface[i];
2226                         if (intf2 != NULL
2227                          && intf2->altsetting != NULL
2228                          && intf2->altsetting->desc.bInterfaceClass ==
2229                                          USB_CLASS_AUDIO) {
2230                                 gspca_dev->audio = 1;
2231                                 break;
2232                         }
2233                 }
2234         }
2235
2236         gspca_dev->sd_desc = sd_desc;
2237         gspca_dev->nbufread = 2;
2238         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2239
2240         /* configure the subdriver and initialize the USB device */
2241         ret = sd_desc->config(gspca_dev, id);
2242         if (ret < 0)
2243                 goto out;
2244         if (gspca_dev->cam.ctrls != NULL)
2245                 ctrls_init(gspca_dev);
2246         ret = sd_desc->init(gspca_dev);
2247         if (ret < 0)
2248                 goto out;
2249         gspca_set_default_mode(gspca_dev);
2250
2251         ret = gspca_input_connect(gspca_dev);
2252         if (ret)
2253                 goto out;
2254
2255         mutex_init(&gspca_dev->usb_lock);
2256         mutex_init(&gspca_dev->queue_lock);
2257         init_waitqueue_head(&gspca_dev->wq);
2258
2259         /* init video stuff */
2260         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2261         gspca_dev->vdev.parent = &intf->dev;
2262         gspca_dev->module = module;
2263         gspca_dev->present = 1;
2264         ret = video_register_device(&gspca_dev->vdev,
2265                                   VFL_TYPE_GRABBER,
2266                                   -1);
2267         if (ret < 0) {
2268                 err("video_register_device err %d", ret);
2269                 goto out;
2270         }
2271
2272         usb_set_intfdata(intf, gspca_dev);
2273         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2274
2275         gspca_input_create_urb(gspca_dev);
2276
2277         return 0;
2278 out:
2279 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2280         if (gspca_dev->input_dev)
2281                 input_unregister_device(gspca_dev->input_dev);
2282 #endif
2283         kfree(gspca_dev->usb_buf);
2284         kfree(gspca_dev);
2285         return ret;
2286 }
2287 EXPORT_SYMBOL(gspca_dev_probe2);
2288
2289 /* same function as the previous one, but check the interface */
2290 int gspca_dev_probe(struct usb_interface *intf,
2291                 const struct usb_device_id *id,
2292                 const struct sd_desc *sd_desc,
2293                 int dev_size,
2294                 struct module *module)
2295 {
2296         struct usb_device *dev = interface_to_usbdev(intf);
2297
2298         /* we don't handle multi-config cameras */
2299         if (dev->descriptor.bNumConfigurations != 1) {
2300                 err("%04x:%04x too many config",
2301                                 id->idVendor, id->idProduct);
2302                 return -ENODEV;
2303         }
2304
2305         /* the USB video interface must be the first one */
2306         if (dev->config->desc.bNumInterfaces != 1
2307          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2308                 return -ENODEV;
2309
2310         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2311 }
2312 EXPORT_SYMBOL(gspca_dev_probe);
2313
2314 /*
2315  * USB disconnection
2316  *
2317  * This function must be called by the sub-driver
2318  * when the device disconnects, after the specific resources are freed.
2319  */
2320 void gspca_disconnect(struct usb_interface *intf)
2321 {
2322         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2323 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2324         struct input_dev *input_dev;
2325 #endif
2326
2327         PDEBUG(D_PROBE, "%s disconnect",
2328                 video_device_node_name(&gspca_dev->vdev));
2329         mutex_lock(&gspca_dev->usb_lock);
2330
2331         gspca_dev->present = 0;
2332         wake_up_interruptible(&gspca_dev->wq);
2333
2334         destroy_urbs(gspca_dev);
2335
2336 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2337         gspca_input_destroy_urb(gspca_dev);
2338         input_dev = gspca_dev->input_dev;
2339         if (input_dev) {
2340                 gspca_dev->input_dev = NULL;
2341                 input_unregister_device(input_dev);
2342         }
2343 #endif
2344
2345         /* the device is freed at exit of this function */
2346         gspca_dev->dev = NULL;
2347         mutex_unlock(&gspca_dev->usb_lock);
2348
2349         usb_set_intfdata(intf, NULL);
2350
2351         /* release the device */
2352         /* (this will call gspca_release() immediatly or on last close) */
2353         video_unregister_device(&gspca_dev->vdev);
2354
2355 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2356 }
2357 EXPORT_SYMBOL(gspca_disconnect);
2358
2359 #ifdef CONFIG_PM
2360 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2361 {
2362         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2363
2364         if (!gspca_dev->streaming)
2365                 return 0;
2366         gspca_dev->frozen = 1;          /* avoid urb error messages */
2367         if (gspca_dev->sd_desc->stopN)
2368                 gspca_dev->sd_desc->stopN(gspca_dev);
2369         destroy_urbs(gspca_dev);
2370         gspca_input_destroy_urb(gspca_dev);
2371         gspca_set_alt0(gspca_dev);
2372         if (gspca_dev->sd_desc->stop0)
2373                 gspca_dev->sd_desc->stop0(gspca_dev);
2374         return 0;
2375 }
2376 EXPORT_SYMBOL(gspca_suspend);
2377
2378 int gspca_resume(struct usb_interface *intf)
2379 {
2380         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2381
2382         gspca_dev->frozen = 0;
2383         gspca_dev->sd_desc->init(gspca_dev);
2384         gspca_input_create_urb(gspca_dev);
2385         if (gspca_dev->streaming)
2386                 return gspca_init_transfer(gspca_dev);
2387         return 0;
2388 }
2389 EXPORT_SYMBOL(gspca_resume);
2390 #endif
2391 /* -- cam driver utility functions -- */
2392
2393 /* auto gain and exposure algorithm based on the knee algorithm described here:
2394    http://ytse.tricolour.net/docs/LowLightOptimization.html
2395
2396    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2397    where changed. */
2398 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2399         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2400 {
2401         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2402         const struct ctrl *gain_ctrl = NULL;
2403         const struct ctrl *exposure_ctrl = NULL;
2404         const struct ctrl *autogain_ctrl = NULL;
2405         int retval = 0;
2406
2407         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2408                 if (gspca_dev->ctrl_dis & (1 << i))
2409                         continue;
2410                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2411                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2412                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2413                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2414                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2415                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2416         }
2417         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2418                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2419                         "on cam without (auto)gain/exposure");
2420                 return 0;
2421         }
2422
2423         if (gain_ctrl->get(gspca_dev, &gain) ||
2424                         exposure_ctrl->get(gspca_dev, &exposure) ||
2425                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2426                 return 0;
2427
2428         orig_gain = gain;
2429         orig_exposure = exposure;
2430
2431         /* If we are of a multiple of deadzone, do multiple steps to reach the
2432            desired lumination fast (with the risc of a slight overshoot) */
2433         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2434
2435         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2436                 avg_lum, desired_avg_lum, steps);
2437
2438         for (i = 0; i < steps; i++) {
2439                 if (avg_lum > desired_avg_lum) {
2440                         if (gain > gain_knee)
2441                                 gain--;
2442                         else if (exposure > exposure_knee)
2443                                 exposure--;
2444                         else if (gain > gain_ctrl->qctrl.default_value)
2445                                 gain--;
2446                         else if (exposure > exposure_ctrl->qctrl.minimum)
2447                                 exposure--;
2448                         else if (gain > gain_ctrl->qctrl.minimum)
2449                                 gain--;
2450                         else
2451                                 break;
2452                 } else {
2453                         if (gain < gain_ctrl->qctrl.default_value)
2454                                 gain++;
2455                         else if (exposure < exposure_knee)
2456                                 exposure++;
2457                         else if (gain < gain_knee)
2458                                 gain++;
2459                         else if (exposure < exposure_ctrl->qctrl.maximum)
2460                                 exposure++;
2461                         else if (gain < gain_ctrl->qctrl.maximum)
2462                                 gain++;
2463                         else
2464                                 break;
2465                 }
2466         }
2467
2468         if (gain != orig_gain) {
2469                 gain_ctrl->set(gspca_dev, gain);
2470                 retval = 1;
2471         }
2472         if (exposure != orig_exposure) {
2473                 exposure_ctrl->set(gspca_dev, exposure);
2474                 retval = 1;
2475         }
2476
2477         return retval;
2478 }
2479 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2480
2481 /* -- module insert / remove -- */
2482 static int __init gspca_init(void)
2483 {
2484         info("v%d.%d.%d registered",
2485                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2486                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2487                 DRIVER_VERSION_NUMBER & 0xff);
2488         return 0;
2489 }
2490 static void __exit gspca_exit(void)
2491 {
2492 }
2493
2494 module_init(gspca_init);
2495 module_exit(gspca_exit);
2496
2497 #ifdef GSPCA_DEBUG
2498 module_param_named(debug, gspca_debug, int, 0644);
2499 MODULE_PARM_DESC(debug,
2500                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2501                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2502                 " 0x0100: v4l2");
2503 #endif