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, 9, 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                         PDEBUG(D_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                         PDEBUG(D_ERR, "Input device registration failed "
 181                                 "with error %i", 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         gspca_dev->int_urb = urb;
 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         return ret;
 233
 234 error_submit:
 235         usb_free_coherent(dev,
 236                           urb->transfer_buffer_length,
 237                           urb->transfer_buffer,
 238                           urb->transfer_dma);
 239 error_buffer:
 240         usb_free_urb(urb);
 241 error:
 242         return ret;
 243 }
 244
 245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 246 {
 247         struct usb_interface *intf;
 248         struct usb_host_interface *intf_desc;
 249         struct usb_endpoint_descriptor *ep;
 250         int i;
 251
 252         if (gspca_dev->sd_desc->int_pkt_scan)  {
 253                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 254                 intf_desc = intf->cur_altsetting;
 255                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 256                         ep = &intf_desc->endpoint[i].desc;
 257                         if (usb_endpoint_dir_in(ep) &&
 258                             usb_endpoint_xfer_int(ep)) {
 259
 260                                 alloc_and_submit_int_urb(gspca_dev, ep);
 261                                 break;
 262                         }
 263                 }
 264         }
 265 }
 266
 267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 268 {
 269         struct urb *urb;
 270
 271         urb = gspca_dev->int_urb;
 272         if (urb) {
 273                 gspca_dev->int_urb = NULL;
 274                 usb_kill_urb(urb);
 275                 usb_free_coherent(gspca_dev->dev,
 276                                   urb->transfer_buffer_length,
 277                                   urb->transfer_buffer,
 278                                   urb->transfer_dma);
 279                 usb_free_urb(urb);
 280         }
 281 }
 282 #else
 283 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 284 {
 285 }
 286
 287 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 288 {
 289 }
 290
 291 static inline int gspca_input_connect(struct gspca_dev *dev)
 292 {
 293         return 0;
 294 }
 295 #endif
 296
 297 /*
 298  * fill a video frame from an URB and resubmit
 299  */
 300 static void fill_frame(struct gspca_dev *gspca_dev,
 301                         struct urb *urb)
 302 {
 303         u8 *data;               /* address of data in the iso message */
 304         int i, len, st;
 305         cam_pkt_op pkt_scan;
 306
 307         if (urb->status != 0) {
 308                 if (urb->status == -ESHUTDOWN)
 309                         return;         /* disconnection */
 310 #ifdef CONFIG_PM
 311                 if (gspca_dev->frozen)
 312                         return;
 313 #endif
 314                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 315                 urb->status = 0;
 316                 goto resubmit;
 317         }
 318         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 319         for (i = 0; i < urb->number_of_packets; i++) {
 320
 321                 /* check the packet status and length */
 322                 len = urb->iso_frame_desc[i].actual_length;
 323                 if (len == 0) {
 324                         if (gspca_dev->empty_packet == 0)
 325                                 gspca_dev->empty_packet = 1;
 326                         continue;
 327                 }
 328                 st = urb->iso_frame_desc[i].status;
 329                 if (st) {
 330                         PDEBUG(D_ERR,
 331                                 "ISOC data error: [%d] len=%d, status=%d",
 332                                 i, len, st);
 333                         gspca_dev->last_packet_type = DISCARD_PACKET;
 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                 PDEBUG(D_ERR|D_PACK, "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                         PDEBUG(D_ERR|D_PACK, "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                         return;
 436                 }
 437                 j = gspca_dev->fr_queue[i];
 438                 frame = &gspca_dev->frame[j];
 439                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 440                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 441                 gspca_dev->image = frame->data;
 442                 gspca_dev->image_len = 0;
 443         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 444                 if (packet_type == LAST_PACKET)
 445                         gspca_dev->last_packet_type = packet_type;
 446                 return;
 447         }
 448
 449         /* append the packet to the frame buffer */
 450         if (len > 0) {
 451                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 452                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 453                                 gspca_dev->image_len + len,
 454                                 gspca_dev->frsz);
 455                         packet_type = DISCARD_PACKET;
 456                 } else {
 457                         memcpy(gspca_dev->image + gspca_dev->image_len,
 458                                 data, len);
 459                         gspca_dev->image_len += len;
 460                 }
 461         }
 462         gspca_dev->last_packet_type = packet_type;
 463
 464         /* if last packet, invalidate packet concatenation until
 465          * next first packet, wake up the application and advance
 466          * in the queue */
 467         if (packet_type == LAST_PACKET) {
 468                 i = atomic_read(&gspca_dev->fr_i);
 469                 j = gspca_dev->fr_queue[i];
 470                 frame = &gspca_dev->frame[j];
 471                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 472                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 473                                          | V4L2_BUF_FLAG_DONE)
 474                                         & ~V4L2_BUF_FLAG_QUEUED;
 475                 i = (i + 1) % GSPCA_MAX_FRAMES;
 476                 atomic_set(&gspca_dev->fr_i, i);
 477                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 478                 PDEBUG(D_FRAM, "frame complete len:%d",
 479                         frame->v4l2_buf.bytesused);
 480                 gspca_dev->image = NULL;
 481                 gspca_dev->image_len = 0;
 482         }
 483 }
 484 EXPORT_SYMBOL(gspca_frame_add);
 485
 486 static int gspca_is_compressed(__u32 format)
 487 {
 488         switch (format) {
 489         case V4L2_PIX_FMT_MJPEG:
 490         case V4L2_PIX_FMT_JPEG:
 491         case V4L2_PIX_FMT_SPCA561:
 492         case V4L2_PIX_FMT_PAC207:
 493         case V4L2_PIX_FMT_MR97310A:
 494                 return 1;
 495         }
 496         return 0;
 497 }
 498
 499 static int frame_alloc(struct gspca_dev *gspca_dev,
 500                         unsigned int count)
 501 {
 502         struct gspca_frame *frame;
 503         unsigned int frsz;
 504         int i;
 505
 506         i = gspca_dev->curr_mode;
 507         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 508         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 509         frsz = PAGE_ALIGN(frsz);
 510         gspca_dev->frsz = frsz;
 511         if (count >= GSPCA_MAX_FRAMES)
 512                 count = GSPCA_MAX_FRAMES - 1;
 513         gspca_dev->frbuf = vmalloc_32(frsz * count);
 514         if (!gspca_dev->frbuf) {
 515                 err("frame alloc failed");
 516                 return -ENOMEM;
 517         }
 518         gspca_dev->nframes = count;
 519         for (i = 0; i < count; i++) {
 520                 frame = &gspca_dev->frame[i];
 521                 frame->v4l2_buf.index = i;
 522                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 523                 frame->v4l2_buf.flags = 0;
 524                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 525                 frame->v4l2_buf.length = frsz;
 526                 frame->v4l2_buf.memory = gspca_dev->memory;
 527                 frame->v4l2_buf.sequence = 0;
 528                 frame->data = gspca_dev->frbuf + i * frsz;
 529                 frame->v4l2_buf.m.offset = i * frsz;
 530         }
 531         atomic_set(&gspca_dev->fr_q, 0);
 532         atomic_set(&gspca_dev->fr_i, 0);
 533         gspca_dev->fr_o = 0;
 534         return 0;
 535 }
 536
 537 static void frame_free(struct gspca_dev *gspca_dev)
 538 {
 539         int i;
 540
 541         PDEBUG(D_STREAM, "frame free");
 542         if (gspca_dev->frbuf != NULL) {
 543                 vfree(gspca_dev->frbuf);
 544                 gspca_dev->frbuf = NULL;
 545                 for (i = 0; i < gspca_dev->nframes; i++)
 546                         gspca_dev->frame[i].data = NULL;
 547         }
 548         gspca_dev->nframes = 0;
 549 }
 550
 551 static void destroy_urbs(struct gspca_dev *gspca_dev)
 552 {
 553         struct urb *urb;
 554         unsigned int i;
 555
 556         PDEBUG(D_STREAM, "kill transfer");
 557         for (i = 0; i < MAX_NURBS; i++) {
 558                 urb = gspca_dev->urb[i];
 559                 if (urb == NULL)
 560                         break;
 561
 562                 gspca_dev->urb[i] = NULL;
 563                 usb_kill_urb(urb);
 564                 if (urb->transfer_buffer != NULL)
 565                         usb_free_coherent(gspca_dev->dev,
 566                                           urb->transfer_buffer_length,
 567                                           urb->transfer_buffer,
 568                                           urb->transfer_dma);
 569                 usb_free_urb(urb);
 570         }
 571 }
 572
 573 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 574 {
 575         int ret;
 576
 577         if (gspca_dev->alt == 0)
 578                 return 0;
 579         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 580         if (ret < 0)
 581                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 582         return ret;
 583 }
 584
 585 /* Note: both the queue and the usb locks should be held when calling this */
 586 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 587 {
 588         gspca_dev->streaming = 0;
 589         if (gspca_dev->present) {
 590                 if (gspca_dev->sd_desc->stopN)
 591                         gspca_dev->sd_desc->stopN(gspca_dev);
 592                 destroy_urbs(gspca_dev);
 593                 gspca_input_destroy_urb(gspca_dev);
 594                 gspca_set_alt0(gspca_dev);
 595                 gspca_input_create_urb(gspca_dev);
 596         }
 597
 598         /* always call stop0 to free the subdriver's resources */
 599         if (gspca_dev->sd_desc->stop0)
 600                 gspca_dev->sd_desc->stop0(gspca_dev);
 601         PDEBUG(D_STREAM, "stream off OK");
 602 }
 603
 604 /*
 605  * look for an input transfer endpoint in an alternate setting
 606  */
 607 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 608                                           int xfer)
 609 {
 610         struct usb_host_endpoint *ep;
 611         int i, attr;
 612
 613         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 614                 ep = &alt->endpoint[i];
 615                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 616                 if (attr == xfer
 617                     && ep->desc.wMaxPacketSize != 0)
 618                         return ep;
 619         }
 620         return NULL;
 621 }
 622
 623 /*
 624  * look for an input (isoc or bulk) endpoint
 625  *
 626  * The endpoint is defined by the subdriver.
 627  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 628  * This routine may be called many times when the bandwidth is too small
 629  * (the bandwidth is checked on urb submit).
 630  */
 631 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 632 {
 633         struct usb_interface *intf;
 634         struct usb_host_endpoint *ep;
 635         int xfer, i, ret;
 636
 637         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 638         ep = NULL;
 639         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 640                                    : USB_ENDPOINT_XFER_ISOC;
 641         i = gspca_dev->alt;                     /* previous alt setting */
 642         if (gspca_dev->cam.reverse_alts) {
 643                 if (gspca_dev->audio)
 644                         i++;
 645                 while (++i < gspca_dev->nbalt) {
 646                         ep = alt_xfer(&intf->altsetting[i], xfer);
 647                         if (ep)
 648                                 break;
 649                 }
 650         } else {
 651                 if (gspca_dev->audio)
 652                         i--;
 653                 while (--i >= 0) {
 654                         ep = alt_xfer(&intf->altsetting[i], xfer);
 655                         if (ep)
 656                                 break;
 657                 }
 658         }
 659         if (ep == NULL) {
 660                 err("no transfer endpoint found");
 661                 return NULL;
 662         }
 663         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 664                         i, ep->desc.bEndpointAddress);
 665         gspca_dev->alt = i;             /* memorize the current alt setting */
 666         if (gspca_dev->nbalt > 1) {
 667                 gspca_input_destroy_urb(gspca_dev);
 668                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 669                 if (ret < 0) {
 670                         err("set alt %d err %d", i, ret);
 671                         ep = NULL;
 672                 }
 673                 gspca_input_create_urb(gspca_dev);
 674         }
 675         return ep;
 676 }
 677
 678 /*
 679  * create the URBs for image transfer
 680  */
 681 static int create_urbs(struct gspca_dev *gspca_dev,
 682                         struct usb_host_endpoint *ep)
 683 {
 684         struct urb *urb;
 685         int n, nurbs, i, psize, npkt, bsize;
 686
 687         /* calculate the packet size and the number of packets */
 688         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 689
 690         if (!gspca_dev->cam.bulk) {             /* isoc */
 691
 692                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 693                 if (gspca_dev->pkt_size == 0)
 694                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 695                 else
 696                         psize = gspca_dev->pkt_size;
 697                 npkt = gspca_dev->cam.npkt;
 698                 if (npkt == 0)
 699                         npkt = 32;              /* default value */
 700                 bsize = psize * npkt;
 701                 PDEBUG(D_STREAM,
 702                         "isoc %d pkts size %d = bsize:%d",
 703                         npkt, psize, bsize);
 704                 nurbs = DEF_NURBS;
 705         } else {                                /* bulk */
 706                 npkt = 0;
 707                 bsize = gspca_dev->cam.bulk_size;
 708                 if (bsize == 0)
 709                         bsize = psize;
 710                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 711                 if (gspca_dev->cam.bulk_nurbs != 0)
 712                         nurbs = gspca_dev->cam.bulk_nurbs;
 713                 else
 714                         nurbs = 1;
 715         }
 716
 717         for (n = 0; n < nurbs; n++) {
 718                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 719                 if (!urb) {
 720                         err("usb_alloc_urb failed");
 721                         return -ENOMEM;
 722                 }
 723                 gspca_dev->urb[n] = urb;
 724                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 725                                                 bsize,
 726                                                 GFP_KERNEL,
 727                                                 &urb->transfer_dma);
 728
 729                 if (urb->transfer_buffer == NULL) {
 730                         err("usb_alloc_coherent failed");
 731                         return -ENOMEM;
 732                 }
 733                 urb->dev = gspca_dev->dev;
 734                 urb->context = gspca_dev;
 735                 urb->transfer_buffer_length = bsize;
 736                 if (npkt != 0) {                /* ISOC */
 737                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 738                                                     ep->desc.bEndpointAddress);
 739                         urb->transfer_flags = URB_ISO_ASAP
 740                                         | URB_NO_TRANSFER_DMA_MAP;
 741                         urb->interval = ep->desc.bInterval;
 742                         urb->complete = isoc_irq;
 743                         urb->number_of_packets = npkt;
 744                         for (i = 0; i < npkt; i++) {
 745                                 urb->iso_frame_desc[i].length = psize;
 746                                 urb->iso_frame_desc[i].offset = psize * i;
 747                         }
 748                 } else {                /* bulk */
 749                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 750                                                 ep->desc.bEndpointAddress),
 751                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 752                         urb->complete = bulk_irq;
 753                 }
 754         }
 755         return 0;
 756 }
 757
 758 /*
 759  * start the USB transfer
 760  */
 761 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 762 {
 763         struct usb_host_endpoint *ep;
 764         struct urb *urb;
 765         int n, ret;
 766
 767         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 768                 return -ERESTARTSYS;
 769
 770         if (!gspca_dev->present) {
 771                 ret = -ENODEV;
 772                 goto out;
 773         }
 774
 775         /* reset the streaming variables */
 776         gspca_dev->image = NULL;
 777         gspca_dev->image_len = 0;
 778         gspca_dev->last_packet_type = DISCARD_PACKET;
 779         gspca_dev->sequence = 0;
 780
 781         gspca_dev->usb_err = 0;
 782
 783         /* set the higher alternate setting and
 784          * loop until urb submit succeeds */
 785         if (gspca_dev->cam.reverse_alts)
 786                 gspca_dev->alt = 0;
 787         else
 788                 gspca_dev->alt = gspca_dev->nbalt;
 789
 790         if (gspca_dev->sd_desc->isoc_init) {
 791                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 792                 if (ret < 0)
 793                         goto out;
 794         }
 795         ep = get_ep(gspca_dev);
 796         if (ep == NULL) {
 797                 ret = -EIO;
 798                 goto out;
 799         }
 800         for (;;) {
 801                 if (!gspca_dev->cam.no_urb_create) {
 802                         PDEBUG(D_STREAM, "init transfer alt %d",
 803                                 gspca_dev->alt);
 804                         ret = create_urbs(gspca_dev, ep);
 805                         if (ret < 0) {
 806                                 destroy_urbs(gspca_dev);
 807                                 goto out;
 808                         }
 809                 }
 810
 811                 /* clear the bulk endpoint */
 812                 if (gspca_dev->cam.bulk)
 813                         usb_clear_halt(gspca_dev->dev,
 814                                         gspca_dev->urb[0]->pipe);
 815
 816                 /* start the cam */
 817                 ret = gspca_dev->sd_desc->start(gspca_dev);
 818                 if (ret < 0) {
 819                         destroy_urbs(gspca_dev);
 820                         goto out;
 821                 }
 822                 gspca_dev->streaming = 1;
 823
 824                 /* some bulk transfers are started by the subdriver */
 825                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 826                         break;
 827
 828                 /* submit the URBs */
 829                 for (n = 0; n < MAX_NURBS; n++) {
 830                         urb = gspca_dev->urb[n];
 831                         if (urb == NULL)
 832                                 break;
 833                         ret = usb_submit_urb(urb, GFP_KERNEL);
 834                         if (ret < 0)
 835                                 break;
 836                 }
 837                 if (ret >= 0)
 838                         break;
 839                 gspca_stream_off(gspca_dev);
 840                 if (ret != -ENOSPC) {
 841                         PDEBUG(D_ERR|D_STREAM,
 842                                 "usb_submit_urb alt %d err %d",
 843                                 gspca_dev->alt, ret);
 844                         goto out;
 845                 }
 846
 847                 /* the bandwidth is not wide enough
 848                  * negociate or try a lower alternate setting */
 849                 PDEBUG(D_ERR|D_STREAM,
 850                         "bandwidth not wide enough - trying again");
 851                 msleep(20);     /* wait for kill complete */
 852                 if (gspca_dev->sd_desc->isoc_nego) {
 853                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 854                         if (ret < 0)
 855                                 goto out;
 856                 } else {
 857                         ep = get_ep(gspca_dev);
 858                         if (ep == NULL) {
 859                                 ret = -EIO;
 860                                 goto out;
 861                         }
 862                 }
 863         }
 864 out:
 865         mutex_unlock(&gspca_dev->usb_lock);
 866         return ret;
 867 }
 868
 869 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 870 {
 871         int i;
 872
 873         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 874         gspca_dev->curr_mode = i;
 875         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 876         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 877         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 878 }
 879
 880 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 881                         int width, int height)
 882 {
 883         int i;
 884
 885         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 886                 if (width >= gspca_dev->cam.cam_mode[i].width
 887                     && height >= gspca_dev->cam.cam_mode[i].height)
 888                         break;
 889         }
 890         return i;
 891 }
 892
 893 /*
 894  * search a mode with the right pixel format
 895  */
 896 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 897                         int mode,
 898                         int pixfmt)
 899 {
 900         int modeU, modeD;
 901
 902         modeU = modeD = mode;
 903         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 904                 if (--modeD >= 0) {
 905                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 906                                                                 == pixfmt)
 907                                 return modeD;
 908                 }
 909                 if (++modeU < gspca_dev->cam.nmodes) {
 910                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 911                                                                 == pixfmt)
 912                                 return modeU;
 913                 }
 914         }
 915         return -EINVAL;
 916 }
 917
 918 #ifdef CONFIG_VIDEO_ADV_DEBUG
 919 static int vidioc_g_register(struct file *file, void *priv,
 920                         struct v4l2_dbg_register *reg)
 921 {
 922         int ret;
 923         struct gspca_dev *gspca_dev = priv;
 924
 925         if (!gspca_dev->sd_desc->get_chip_ident)
 926                 return -EINVAL;
 927
 928         if (!gspca_dev->sd_desc->get_register)
 929                 return -EINVAL;
 930
 931         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 932                 return -ERESTARTSYS;
 933         gspca_dev->usb_err = 0;
 934         if (gspca_dev->present)
 935                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 936         else
 937                 ret = -ENODEV;
 938         mutex_unlock(&gspca_dev->usb_lock);
 939
 940         return ret;
 941 }
 942
 943 static int vidioc_s_register(struct file *file, void *priv,
 944                         struct v4l2_dbg_register *reg)
 945 {
 946         int ret;
 947         struct gspca_dev *gspca_dev = priv;
 948
 949         if (!gspca_dev->sd_desc->get_chip_ident)
 950                 return -EINVAL;
 951
 952         if (!gspca_dev->sd_desc->set_register)
 953                 return -EINVAL;
 954
 955         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 956                 return -ERESTARTSYS;
 957         gspca_dev->usb_err = 0;
 958         if (gspca_dev->present)
 959                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 960         else
 961                 ret = -ENODEV;
 962         mutex_unlock(&gspca_dev->usb_lock);
 963
 964         return ret;
 965 }
 966 #endif
 967
 968 static int vidioc_g_chip_ident(struct file *file, void *priv,
 969                         struct v4l2_dbg_chip_ident *chip)
 970 {
 971         int ret;
 972         struct gspca_dev *gspca_dev = priv;
 973
 974         if (!gspca_dev->sd_desc->get_chip_ident)
 975                 return -EINVAL;
 976
 977         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 978                 return -ERESTARTSYS;
 979         gspca_dev->usb_err = 0;
 980         if (gspca_dev->present)
 981                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 982         else
 983                 ret = -ENODEV;
 984         mutex_unlock(&gspca_dev->usb_lock);
 985
 986         return ret;
 987 }
 988
 989 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 990                                 struct v4l2_fmtdesc *fmtdesc)
 991 {
 992         struct gspca_dev *gspca_dev = priv;
 993         int i, j, index;
 994         __u32 fmt_tb[8];
 995
 996         /* give an index to each format */
 997         index = 0;
 998         j = 0;
 999         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1000                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1001                 j = 0;
1002                 for (;;) {
1003                         if (fmt_tb[j] == fmt_tb[index])
1004                                 break;
1005                         j++;
1006                 }
1007                 if (j == index) {
1008                         if (fmtdesc->index == index)
1009                                 break;          /* new format */
1010                         index++;
1011                         if (index >= ARRAY_SIZE(fmt_tb))
1012                                 return -EINVAL;
1013                 }
1014         }
1015         if (i < 0)
1016                 return -EINVAL;         /* no more format */
1017
1018         fmtdesc->pixelformat = fmt_tb[index];
1019         if (gspca_is_compressed(fmt_tb[index]))
1020                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1021         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1022         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1023         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1024         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1025         fmtdesc->description[4] = '\0';
1026         return 0;
1027 }
1028
1029 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1030                             struct v4l2_format *fmt)
1031 {
1032         struct gspca_dev *gspca_dev = priv;
1033         int mode;
1034
1035         mode = gspca_dev->curr_mode;
1036         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1037                 sizeof fmt->fmt.pix);
1038         return 0;
1039 }
1040
1041 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1042                         struct v4l2_format *fmt)
1043 {
1044         int w, h, mode, mode2;
1045
1046         w = fmt->fmt.pix.width;
1047         h = fmt->fmt.pix.height;
1048
1049 #ifdef GSPCA_DEBUG
1050         if (gspca_debug & D_CONF)
1051                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1052 #endif
1053         /* search the closest mode for width and height */
1054         mode = wxh_to_mode(gspca_dev, w, h);
1055
1056         /* OK if right palette */
1057         if (gspca_dev->cam.cam_mode[mode].pixelformat
1058                                                 != fmt->fmt.pix.pixelformat) {
1059
1060                 /* else, search the closest mode with the same pixel format */
1061                 mode2 = gspca_get_mode(gspca_dev, mode,
1062                                         fmt->fmt.pix.pixelformat);
1063                 if (mode2 >= 0)
1064                         mode = mode2;
1065 /*              else
1066                         ;                * no chance, return this mode */
1067         }
1068         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1069                 sizeof fmt->fmt.pix);
1070         return mode;                    /* used when s_fmt */
1071 }
1072
1073 static int vidioc_try_fmt_vid_cap(struct file *file,
1074                               void *priv,
1075                               struct v4l2_format *fmt)
1076 {
1077         struct gspca_dev *gspca_dev = priv;
1078         int ret;
1079
1080         ret = try_fmt_vid_cap(gspca_dev, fmt);
1081         if (ret < 0)
1082                 return ret;
1083         return 0;
1084 }
1085
1086 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1087                             struct v4l2_format *fmt)
1088 {
1089         struct gspca_dev *gspca_dev = priv;
1090         int ret;
1091
1092         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1093                 return -ERESTARTSYS;
1094
1095         ret = try_fmt_vid_cap(gspca_dev, fmt);
1096         if (ret < 0)
1097                 goto out;
1098
1099         if (gspca_dev->nframes != 0
1100             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1101                 ret = -EINVAL;
1102                 goto out;
1103         }
1104
1105         if (ret == gspca_dev->curr_mode) {
1106                 ret = 0;
1107                 goto out;                       /* same mode */
1108         }
1109
1110         if (gspca_dev->streaming) {
1111                 ret = -EBUSY;
1112                 goto out;
1113         }
1114         gspca_dev->width = fmt->fmt.pix.width;
1115         gspca_dev->height = fmt->fmt.pix.height;
1116         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1117         gspca_dev->curr_mode = ret;
1118
1119         ret = 0;
1120 out:
1121         mutex_unlock(&gspca_dev->queue_lock);
1122         return ret;
1123 }
1124
1125 static int vidioc_enum_framesizes(struct file *file, void *priv,
1126                                   struct v4l2_frmsizeenum *fsize)
1127 {
1128         struct gspca_dev *gspca_dev = priv;
1129         int i;
1130         __u32 index = 0;
1131
1132         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1133                 if (fsize->pixel_format !=
1134                                 gspca_dev->cam.cam_mode[i].pixelformat)
1135                         continue;
1136
1137                 if (fsize->index == index) {
1138                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1139                         fsize->discrete.width =
1140                                 gspca_dev->cam.cam_mode[i].width;
1141                         fsize->discrete.height =
1142                                 gspca_dev->cam.cam_mode[i].height;
1143                         return 0;
1144                 }
1145                 index++;
1146         }
1147
1148         return -EINVAL;
1149 }
1150
1151 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1152                                       struct v4l2_frmivalenum *fival)
1153 {
1154         struct gspca_dev *gspca_dev = priv;
1155         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1156         __u32 i;
1157
1158         if (gspca_dev->cam.mode_framerates == NULL ||
1159                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1160                 return -EINVAL;
1161
1162         if (fival->pixel_format !=
1163                         gspca_dev->cam.cam_mode[mode].pixelformat)
1164                 return -EINVAL;
1165
1166         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1167                 if (fival->index == i) {
1168                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1169                         fival->discrete.numerator = 1;
1170                         fival->discrete.denominator =
1171                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1172                         return 0;
1173                 }
1174         }
1175
1176         return -EINVAL;
1177 }
1178
1179 static void gspca_release(struct video_device *vfd)
1180 {
1181         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1182
1183         PDEBUG(D_PROBE, "%s released",
1184                 video_device_node_name(&gspca_dev->vdev));
1185
1186         kfree(gspca_dev->usb_buf);
1187         kfree(gspca_dev);
1188 }
1189
1190 static int dev_open(struct file *file)
1191 {
1192         struct gspca_dev *gspca_dev;
1193         int ret;
1194
1195         PDEBUG(D_STREAM, "[%s] open", current->comm);
1196         gspca_dev = (struct gspca_dev *) video_devdata(file);
1197         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1198                 return -ERESTARTSYS;
1199         if (!gspca_dev->present) {
1200                 ret = -ENODEV;
1201                 goto out;
1202         }
1203
1204         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1205                 ret = -EBUSY;
1206                 goto out;
1207         }
1208
1209         /* protect the subdriver against rmmod */
1210         if (!try_module_get(gspca_dev->module)) {
1211                 ret = -ENODEV;
1212                 goto out;
1213         }
1214
1215         gspca_dev->users++;
1216
1217         file->private_data = gspca_dev;
1218 #ifdef GSPCA_DEBUG
1219         /* activate the v4l2 debug */
1220         if (gspca_debug & D_V4L2)
1221                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1222                                         | V4L2_DEBUG_IOCTL_ARG;
1223         else
1224                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1225                                         | V4L2_DEBUG_IOCTL_ARG);
1226 #endif
1227         ret = 0;
1228 out:
1229         mutex_unlock(&gspca_dev->queue_lock);
1230         if (ret != 0)
1231                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1232         else
1233                 PDEBUG(D_STREAM, "open done");
1234         return ret;
1235 }
1236
1237 static int dev_close(struct file *file)
1238 {
1239         struct gspca_dev *gspca_dev = file->private_data;
1240
1241         PDEBUG(D_STREAM, "[%s] close", current->comm);
1242         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1243                 return -ERESTARTSYS;
1244         gspca_dev->users--;
1245
1246         /* if the file did the capture, free the streaming resources */
1247         if (gspca_dev->capt_file == file) {
1248                 if (gspca_dev->streaming) {
1249                         mutex_lock(&gspca_dev->usb_lock);
1250                         gspca_dev->usb_err = 0;
1251                         gspca_stream_off(gspca_dev);
1252                         mutex_unlock(&gspca_dev->usb_lock);
1253                 }
1254                 frame_free(gspca_dev);
1255                 gspca_dev->capt_file = NULL;
1256                 gspca_dev->memory = GSPCA_MEMORY_NO;
1257         }
1258         file->private_data = NULL;
1259         module_put(gspca_dev->module);
1260         mutex_unlock(&gspca_dev->queue_lock);
1261
1262         PDEBUG(D_STREAM, "close done");
1263
1264         return 0;
1265 }
1266
1267 static int vidioc_querycap(struct file *file, void  *priv,
1268                            struct v4l2_capability *cap)
1269 {
1270         struct gspca_dev *gspca_dev = priv;
1271         int ret;
1272
1273         /* protect the access to the usb device */
1274         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1275                 return -ERESTARTSYS;
1276         if (!gspca_dev->present) {
1277                 ret = -ENODEV;
1278                 goto out;
1279         }
1280         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1281         if (gspca_dev->dev->product != NULL) {
1282                 strncpy(cap->card, gspca_dev->dev->product,
1283                         sizeof cap->card);
1284         } else {
1285                 snprintf(cap->card, sizeof cap->card,
1286                         "USB Camera (%04x:%04x)",
1287                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1288                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1289         }
1290         usb_make_path(gspca_dev->dev, cap->bus_info, 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 const struct ctrl *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 ctrls;
1314         }
1315         return NULL;
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         int i;
1324         u32 id;
1325
1326         ctrls = NULL;
1327         id = q_ctrl->id;
1328         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1329                 id &= V4L2_CTRL_ID_MASK;
1330                 id++;
1331                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1332                         if (gspca_dev->ctrl_dis & (1 << i))
1333                                 continue;
1334                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1335                                 continue;
1336                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1337                                             > ctrls->qctrl.id)
1338                                 continue;
1339                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1340                 }
1341                 if (ctrls == NULL)
1342                         return -EINVAL;
1343         } else {
1344                 ctrls = get_ctrl(gspca_dev, id);
1345                 if (ctrls == NULL)
1346                         return -EINVAL;
1347                 i = ctrls - gspca_dev->sd_desc->ctrls;
1348         }
1349         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1350         if (gspca_dev->ctrl_inac & (1 << i))
1351                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1352         return 0;
1353 }
1354
1355 static int vidioc_s_ctrl(struct file *file, void *priv,
1356                          struct v4l2_control *ctrl)
1357 {
1358         struct gspca_dev *gspca_dev = priv;
1359         const struct ctrl *ctrls;
1360         int ret;
1361
1362         ctrls = get_ctrl(gspca_dev, ctrl->id);
1363         if (ctrls == NULL)
1364                 return -EINVAL;
1365
1366         if (ctrl->value < ctrls->qctrl.minimum
1367             || ctrl->value > ctrls->qctrl.maximum)
1368                 return -ERANGE;
1369         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1370         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1371                 return -ERESTARTSYS;
1372         gspca_dev->usb_err = 0;
1373         if (gspca_dev->present)
1374                 ret = ctrls->set(gspca_dev, ctrl->value);
1375         else
1376                 ret = -ENODEV;
1377         mutex_unlock(&gspca_dev->usb_lock);
1378         return ret;
1379 }
1380
1381 static int vidioc_g_ctrl(struct file *file, void *priv,
1382                          struct v4l2_control *ctrl)
1383 {
1384         struct gspca_dev *gspca_dev = priv;
1385         const struct ctrl *ctrls;
1386         int ret;
1387
1388         ctrls = get_ctrl(gspca_dev, ctrl->id);
1389         if (ctrls == NULL)
1390                 return -EINVAL;
1391
1392         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1393                 return -ERESTARTSYS;
1394         gspca_dev->usb_err = 0;
1395         if (gspca_dev->present)
1396                 ret = ctrls->get(gspca_dev, &ctrl->value);
1397         else
1398                 ret = -ENODEV;
1399         mutex_unlock(&gspca_dev->usb_lock);
1400         return ret;
1401 }
1402
1403 static int vidioc_querymenu(struct file *file, void *priv,
1404                             struct v4l2_querymenu *qmenu)
1405 {
1406         struct gspca_dev *gspca_dev = priv;
1407
1408         if (!gspca_dev->sd_desc->querymenu)
1409                 return -EINVAL;
1410         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1411 }
1412
1413 static int vidioc_enum_input(struct file *file, void *priv,
1414                                 struct v4l2_input *input)
1415 {
1416         struct gspca_dev *gspca_dev = priv;
1417
1418         if (input->index != 0)
1419                 return -EINVAL;
1420         input->type = V4L2_INPUT_TYPE_CAMERA;
1421         input->status = gspca_dev->cam.input_flags;
1422         strncpy(input->name, gspca_dev->sd_desc->name,
1423                 sizeof input->name);
1424         return 0;
1425 }
1426
1427 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1428 {
1429         *i = 0;
1430         return 0;
1431 }
1432
1433 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1434 {
1435         if (i > 0)
1436                 return -EINVAL;
1437         return (0);
1438 }
1439
1440 static int vidioc_reqbufs(struct file *file, void *priv,
1441                           struct v4l2_requestbuffers *rb)
1442 {
1443         struct gspca_dev *gspca_dev = priv;
1444         int i, ret = 0, streaming;
1445
1446         i = rb->memory;                 /* (avoid compilation warning) */
1447         switch (i) {
1448         case GSPCA_MEMORY_READ:                 /* (internal call) */
1449         case V4L2_MEMORY_MMAP:
1450         case V4L2_MEMORY_USERPTR:
1451                 break;
1452         default:
1453                 return -EINVAL;
1454         }
1455         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1456                 return -ERESTARTSYS;
1457
1458         if (gspca_dev->memory != GSPCA_MEMORY_NO
1459             && gspca_dev->memory != rb->memory) {
1460                 ret = -EBUSY;
1461                 goto out;
1462         }
1463
1464         /* only one file may do the capture */
1465         if (gspca_dev->capt_file != NULL
1466             && gspca_dev->capt_file != file) {
1467                 ret = -EBUSY;
1468                 goto out;
1469         }
1470
1471         /* if allocated, the buffers must not be mapped */
1472         for (i = 0; i < gspca_dev->nframes; i++) {
1473                 if (gspca_dev->frame[i].vma_use_count) {
1474                         ret = -EBUSY;
1475                         goto out;
1476                 }
1477         }
1478
1479         /* stop streaming */
1480         streaming = gspca_dev->streaming;
1481         if (streaming) {
1482                 mutex_lock(&gspca_dev->usb_lock);
1483                 gspca_dev->usb_err = 0;
1484                 gspca_stream_off(gspca_dev);
1485                 mutex_unlock(&gspca_dev->usb_lock);
1486         }
1487
1488         /* free the previous allocated buffers, if any */
1489         if (gspca_dev->nframes != 0) {
1490                 frame_free(gspca_dev);
1491                 gspca_dev->capt_file = NULL;
1492         }
1493         if (rb->count == 0)                     /* unrequest */
1494                 goto out;
1495         gspca_dev->memory = rb->memory;
1496         ret = frame_alloc(gspca_dev, rb->count);
1497         if (ret == 0) {
1498                 rb->count = gspca_dev->nframes;
1499                 gspca_dev->capt_file = file;
1500                 if (streaming)
1501                         ret = gspca_init_transfer(gspca_dev);
1502         }
1503 out:
1504         mutex_unlock(&gspca_dev->queue_lock);
1505         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1506         return ret;
1507 }
1508
1509 static int vidioc_querybuf(struct file *file, void *priv,
1510                            struct v4l2_buffer *v4l2_buf)
1511 {
1512         struct gspca_dev *gspca_dev = priv;
1513         struct gspca_frame *frame;
1514
1515         if (v4l2_buf->index < 0
1516             || v4l2_buf->index >= gspca_dev->nframes)
1517                 return -EINVAL;
1518
1519         frame = &gspca_dev->frame[v4l2_buf->index];
1520         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1521         return 0;
1522 }
1523
1524 static int vidioc_streamon(struct file *file, void *priv,
1525                            enum v4l2_buf_type buf_type)
1526 {
1527         struct gspca_dev *gspca_dev = priv;
1528         int ret;
1529
1530         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1531                 return -EINVAL;
1532         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1533                 return -ERESTARTSYS;
1534
1535         /* check the capture file */
1536         if (gspca_dev->capt_file != file) {
1537                 ret = -EBUSY;
1538                 goto out;
1539         }
1540
1541         if (gspca_dev->nframes == 0
1542             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1543                 ret = -EINVAL;
1544                 goto out;
1545         }
1546         if (!gspca_dev->streaming) {
1547                 ret = gspca_init_transfer(gspca_dev);
1548                 if (ret < 0)
1549                         goto out;
1550         }
1551 #ifdef GSPCA_DEBUG
1552         if (gspca_debug & D_STREAM) {
1553                 PDEBUG_MODE("stream on OK",
1554                         gspca_dev->pixfmt,
1555                         gspca_dev->width,
1556                         gspca_dev->height);
1557         }
1558 #endif
1559         ret = 0;
1560 out:
1561         mutex_unlock(&gspca_dev->queue_lock);
1562         return ret;
1563 }
1564
1565 static int vidioc_streamoff(struct file *file, void *priv,
1566                                 enum v4l2_buf_type buf_type)
1567 {
1568         struct gspca_dev *gspca_dev = priv;
1569         int ret;
1570
1571         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1572                 return -EINVAL;
1573         if (!gspca_dev->streaming)
1574                 return 0;
1575         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1576                 return -ERESTARTSYS;
1577
1578         /* check the capture file */
1579         if (gspca_dev->capt_file != file) {
1580                 ret = -EBUSY;
1581                 goto out;
1582         }
1583
1584         /* stop streaming */
1585         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1586                 ret = -ERESTARTSYS;
1587                 goto out;
1588         }
1589         gspca_dev->usb_err = 0;
1590         gspca_stream_off(gspca_dev);
1591         mutex_unlock(&gspca_dev->usb_lock);
1592
1593         /* empty the transfer queues */
1594         atomic_set(&gspca_dev->fr_q, 0);
1595         atomic_set(&gspca_dev->fr_i, 0);
1596         gspca_dev->fr_o = 0;
1597         ret = 0;
1598 out:
1599         mutex_unlock(&gspca_dev->queue_lock);
1600         return ret;
1601 }
1602
1603 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1604                         struct v4l2_jpegcompression *jpegcomp)
1605 {
1606         struct gspca_dev *gspca_dev = priv;
1607         int ret;
1608
1609         if (!gspca_dev->sd_desc->get_jcomp)
1610                 return -EINVAL;
1611         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1612                 return -ERESTARTSYS;
1613         gspca_dev->usb_err = 0;
1614         if (gspca_dev->present)
1615                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1616         else
1617                 ret = -ENODEV;
1618         mutex_unlock(&gspca_dev->usb_lock);
1619         return ret;
1620 }
1621
1622 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1623                         struct v4l2_jpegcompression *jpegcomp)
1624 {
1625         struct gspca_dev *gspca_dev = priv;
1626         int ret;
1627
1628         if (!gspca_dev->sd_desc->set_jcomp)
1629                 return -EINVAL;
1630         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1631                 return -ERESTARTSYS;
1632         gspca_dev->usb_err = 0;
1633         if (gspca_dev->present)
1634                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1635         else
1636                 ret = -ENODEV;
1637         mutex_unlock(&gspca_dev->usb_lock);
1638         return ret;
1639 }
1640
1641 static int vidioc_g_parm(struct file *filp, void *priv,
1642                         struct v4l2_streamparm *parm)
1643 {
1644         struct gspca_dev *gspca_dev = priv;
1645
1646         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1647
1648         if (gspca_dev->sd_desc->get_streamparm) {
1649                 int ret;
1650
1651                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1652                         return -ERESTARTSYS;
1653                 gspca_dev->usb_err = 0;
1654                 if (gspca_dev->present)
1655                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1656                                                                  parm);
1657                 else
1658                         ret = -ENODEV;
1659                 mutex_unlock(&gspca_dev->usb_lock);
1660                 return ret;
1661         }
1662
1663         return 0;
1664 }
1665
1666 static int vidioc_s_parm(struct file *filp, void *priv,
1667                         struct v4l2_streamparm *parm)
1668 {
1669         struct gspca_dev *gspca_dev = priv;
1670         int n;
1671
1672         n = parm->parm.capture.readbuffers;
1673         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1674                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1675         else
1676                 gspca_dev->nbufread = n;
1677
1678         if (gspca_dev->sd_desc->set_streamparm) {
1679                 int ret;
1680
1681                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1682                         return -ERESTARTSYS;
1683                 gspca_dev->usb_err = 0;
1684                 if (gspca_dev->present)
1685                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1686                                                                  parm);
1687                 else
1688                         ret = -ENODEV;
1689                 mutex_unlock(&gspca_dev->usb_lock);
1690                 return ret;
1691         }
1692
1693         return 0;
1694 }
1695
1696 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1697 {
1698         struct gspca_dev *gspca_dev = file->private_data;
1699         struct gspca_frame *frame;
1700         struct page *page;
1701         unsigned long addr, start, size;
1702         int i, ret;
1703
1704         start = vma->vm_start;
1705         size = vma->vm_end - vma->vm_start;
1706         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1707
1708         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1709                 return -ERESTARTSYS;
1710         if (!gspca_dev->present) {
1711                 ret = -ENODEV;
1712                 goto out;
1713         }
1714         if (gspca_dev->capt_file != file) {
1715                 ret = -EINVAL;
1716                 goto out;
1717         }
1718
1719         frame = NULL;
1720         for (i = 0; i < gspca_dev->nframes; ++i) {
1721                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1722                         PDEBUG(D_STREAM, "mmap bad memory type");
1723                         break;
1724                 }
1725                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1726                                                 == vma->vm_pgoff) {
1727                         frame = &gspca_dev->frame[i];
1728                         break;
1729                 }
1730         }
1731         if (frame == NULL) {
1732                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1733                 ret = -EINVAL;
1734                 goto out;
1735         }
1736         if (size != frame->v4l2_buf.length) {
1737                 PDEBUG(D_STREAM, "mmap bad size");
1738                 ret = -EINVAL;
1739                 goto out;
1740         }
1741
1742         /*
1743          * - VM_IO marks the area as being a mmaped region for I/O to a
1744          *   device. It also prevents the region from being core dumped.
1745          */
1746         vma->vm_flags |= VM_IO;
1747
1748         addr = (unsigned long) frame->data;
1749         while (size > 0) {
1750                 page = vmalloc_to_page((void *) addr);
1751                 ret = vm_insert_page(vma, start, page);
1752                 if (ret < 0)
1753                         goto out;
1754                 start += PAGE_SIZE;
1755                 addr += PAGE_SIZE;
1756                 size -= PAGE_SIZE;
1757         }
1758
1759         vma->vm_ops = &gspca_vm_ops;
1760         vma->vm_private_data = frame;
1761         gspca_vm_open(vma);
1762         ret = 0;
1763 out:
1764         mutex_unlock(&gspca_dev->queue_lock);
1765         return ret;
1766 }
1767
1768 /*
1769  * wait for a video frame
1770  *
1771  * If a frame is ready, its index is returned.
1772  */
1773 static int frame_wait(struct gspca_dev *gspca_dev,
1774                         int nonblock_ing)
1775 {
1776         int i, ret;
1777
1778         /* check if a frame is ready */
1779         i = gspca_dev->fr_o;
1780         if (i == atomic_read(&gspca_dev->fr_i)) {
1781                 if (nonblock_ing)
1782                         return -EAGAIN;
1783
1784                 /* wait till a frame is ready */
1785                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1786                         i != atomic_read(&gspca_dev->fr_i) ||
1787                         !gspca_dev->streaming || !gspca_dev->present,
1788                         msecs_to_jiffies(3000));
1789                 if (ret < 0)
1790                         return ret;
1791                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1792                         return -EIO;
1793         }
1794
1795         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1796
1797         if (gspca_dev->sd_desc->dq_callback) {
1798                 mutex_lock(&gspca_dev->usb_lock);
1799                 gspca_dev->usb_err = 0;
1800                 if (gspca_dev->present)
1801                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1802                 mutex_unlock(&gspca_dev->usb_lock);
1803         }
1804         return gspca_dev->fr_queue[i];
1805 }
1806
1807 /*
1808  * dequeue a video buffer
1809  *
1810  * If nonblock_ing is false, block until a buffer is available.
1811  */
1812 static int vidioc_dqbuf(struct file *file, void *priv,
1813                         struct v4l2_buffer *v4l2_buf)
1814 {
1815         struct gspca_dev *gspca_dev = priv;
1816         struct gspca_frame *frame;
1817         int i, ret;
1818
1819         PDEBUG(D_FRAM, "dqbuf");
1820         if (v4l2_buf->memory != gspca_dev->memory)
1821                 return -EINVAL;
1822
1823         if (!gspca_dev->present)
1824                 return -ENODEV;
1825
1826         /* if not streaming, be sure the application will not loop forever */
1827         if (!(file->f_flags & O_NONBLOCK)
1828             && !gspca_dev->streaming && gspca_dev->users == 1)
1829                 return -EINVAL;
1830
1831         /* only the capturing file may dequeue */
1832         if (gspca_dev->capt_file != file)
1833                 return -EINVAL;
1834
1835         /* only one dequeue / read at a time */
1836         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1837                 return -ERESTARTSYS;
1838
1839         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1840         if (ret < 0)
1841                 goto out;
1842         i = ret;                                /* frame index */
1843         frame = &gspca_dev->frame[i];
1844         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1845                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1846                                  frame->data,
1847                                  frame->v4l2_buf.bytesused)) {
1848                         PDEBUG(D_ERR|D_STREAM,
1849                                 "dqbuf cp to user failed");
1850                         ret = -EFAULT;
1851                         goto out;
1852                 }
1853         }
1854         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1855         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1856         PDEBUG(D_FRAM, "dqbuf %d", i);
1857         ret = 0;
1858 out:
1859         mutex_unlock(&gspca_dev->read_lock);
1860         return ret;
1861 }
1862
1863 /*
1864  * queue a video buffer
1865  *
1866  * Attempting to queue a buffer that has already been
1867  * queued will return -EINVAL.
1868  */
1869 static int vidioc_qbuf(struct file *file, void *priv,
1870                         struct v4l2_buffer *v4l2_buf)
1871 {
1872         struct gspca_dev *gspca_dev = priv;
1873         struct gspca_frame *frame;
1874         int i, index, ret;
1875
1876         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1877
1878         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1879                 return -ERESTARTSYS;
1880
1881         index = v4l2_buf->index;
1882         if ((unsigned) index >= gspca_dev->nframes) {
1883                 PDEBUG(D_FRAM,
1884                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1885                 ret = -EINVAL;
1886                 goto out;
1887         }
1888         if (v4l2_buf->memory != gspca_dev->memory) {
1889                 PDEBUG(D_FRAM, "qbuf bad memory type");
1890                 ret = -EINVAL;
1891                 goto out;
1892         }
1893
1894         frame = &gspca_dev->frame[index];
1895         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1896                 PDEBUG(D_FRAM, "qbuf bad state");
1897                 ret = -EINVAL;
1898                 goto out;
1899         }
1900
1901         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1902
1903         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1904                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1905                 frame->v4l2_buf.length = v4l2_buf->length;
1906         }
1907
1908         /* put the buffer in the 'queued' queue */
1909         i = atomic_read(&gspca_dev->fr_q);
1910         gspca_dev->fr_queue[i] = index;
1911         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1912
1913         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1914         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1915         ret = 0;
1916 out:
1917         mutex_unlock(&gspca_dev->queue_lock);
1918         return ret;
1919 }
1920
1921 /*
1922  * allocate the resources for read()
1923  */
1924 static int read_alloc(struct gspca_dev *gspca_dev,
1925                         struct file *file)
1926 {
1927         struct v4l2_buffer v4l2_buf;
1928         int i, ret;
1929
1930         PDEBUG(D_STREAM, "read alloc");
1931         if (gspca_dev->nframes == 0) {
1932                 struct v4l2_requestbuffers rb;
1933
1934                 memset(&rb, 0, sizeof rb);
1935                 rb.count = gspca_dev->nbufread;
1936                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1937                 rb.memory = GSPCA_MEMORY_READ;
1938                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1939                 if (ret != 0) {
1940                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1941                         return ret;
1942                 }
1943                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1944                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1945                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1946                 for (i = 0; i < gspca_dev->nbufread; i++) {
1947                         v4l2_buf.index = i;
1948                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1949                         if (ret != 0) {
1950                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1951                                 return ret;
1952                         }
1953                 }
1954                 gspca_dev->memory = GSPCA_MEMORY_READ;
1955         }
1956
1957         /* start streaming */
1958         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1959         if (ret != 0)
1960                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1961         return ret;
1962 }
1963
1964 static unsigned int dev_poll(struct file *file, poll_table *wait)
1965 {
1966         struct gspca_dev *gspca_dev = file->private_data;
1967         int ret;
1968
1969         PDEBUG(D_FRAM, "poll");
1970
1971         poll_wait(file, &gspca_dev->wq, wait);
1972
1973         /* if reqbufs is not done, the user would use read() */
1974         if (gspca_dev->nframes == 0) {
1975                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1976                         return POLLERR;         /* not the 1st time */
1977                 ret = read_alloc(gspca_dev, file);
1978                 if (ret != 0)
1979                         return POLLERR;
1980         }
1981
1982         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1983                 return POLLERR;
1984
1985         /* check if an image has been received */
1986         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1987                 ret = POLLIN | POLLRDNORM;      /* yes */
1988         else
1989                 ret = 0;
1990         mutex_unlock(&gspca_dev->queue_lock);
1991         if (!gspca_dev->present)
1992                 return POLLHUP;
1993         return ret;
1994 }
1995
1996 static ssize_t dev_read(struct file *file, char __user *data,
1997                     size_t count, loff_t *ppos)
1998 {
1999         struct gspca_dev *gspca_dev = file->private_data;
2000         struct gspca_frame *frame;
2001         struct v4l2_buffer v4l2_buf;
2002         struct timeval timestamp;
2003         int n, ret, ret2;
2004
2005         PDEBUG(D_FRAM, "read (%zd)", count);
2006         if (!gspca_dev->present)
2007                 return -ENODEV;
2008         switch (gspca_dev->memory) {
2009         case GSPCA_MEMORY_NO:                   /* first time */
2010                 ret = read_alloc(gspca_dev, file);
2011                 if (ret != 0)
2012                         return ret;
2013                 break;
2014         case GSPCA_MEMORY_READ:
2015                 if (gspca_dev->capt_file == file)
2016                         break;
2017                 /* fall thru */
2018         default:
2019                 return -EINVAL;
2020         }
2021
2022         /* get a frame */
2023         timestamp = ktime_to_timeval(ktime_get());
2024         timestamp.tv_sec--;
2025         n = 2;
2026         for (;;) {
2027                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2028                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2029                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2030                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2031                 if (ret != 0) {
2032                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2033                         return ret;
2034                 }
2035
2036                 /* if the process slept for more than 1 second,
2037                  * get a newer frame */
2038                 frame = &gspca_dev->frame[v4l2_buf.index];
2039                 if (--n < 0)
2040                         break;                  /* avoid infinite loop */
2041                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2042                         break;
2043                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2044                 if (ret != 0) {
2045                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2046                         return ret;
2047                 }
2048         }
2049
2050         /* copy the frame */
2051         if (count > frame->v4l2_buf.bytesused)
2052                 count = frame->v4l2_buf.bytesused;
2053         ret = copy_to_user(data, frame->data, count);
2054         if (ret != 0) {
2055                 PDEBUG(D_ERR|D_STREAM,
2056                         "read cp to user lack %d / %zd", ret, count);
2057                 ret = -EFAULT;
2058                 goto out;
2059         }
2060         ret = count;
2061 out:
2062         /* in each case, requeue the buffer */
2063         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2064         if (ret2 != 0)
2065                 return ret2;
2066         return ret;
2067 }
2068
2069 static struct v4l2_file_operations dev_fops = {
2070         .owner = THIS_MODULE,
2071         .open = dev_open,
2072         .release = dev_close,
2073         .read = dev_read,
2074         .mmap = dev_mmap,
2075         .unlocked_ioctl = video_ioctl2,
2076         .poll   = dev_poll,
2077 };
2078
2079 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2080         .vidioc_querycap        = vidioc_querycap,
2081         .vidioc_dqbuf           = vidioc_dqbuf,
2082         .vidioc_qbuf            = vidioc_qbuf,
2083         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2084         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2085         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2086         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2087         .vidioc_streamon        = vidioc_streamon,
2088         .vidioc_queryctrl       = vidioc_queryctrl,
2089         .vidioc_g_ctrl          = vidioc_g_ctrl,
2090         .vidioc_s_ctrl          = vidioc_s_ctrl,
2091         .vidioc_querymenu       = vidioc_querymenu,
2092         .vidioc_enum_input      = vidioc_enum_input,
2093         .vidioc_g_input         = vidioc_g_input,
2094         .vidioc_s_input         = vidioc_s_input,
2095         .vidioc_reqbufs         = vidioc_reqbufs,
2096         .vidioc_querybuf        = vidioc_querybuf,
2097         .vidioc_streamoff       = vidioc_streamoff,
2098         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2099         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2100         .vidioc_g_parm          = vidioc_g_parm,
2101         .vidioc_s_parm          = vidioc_s_parm,
2102         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2103         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2104 #ifdef CONFIG_VIDEO_ADV_DEBUG
2105         .vidioc_g_register      = vidioc_g_register,
2106         .vidioc_s_register      = vidioc_s_register,
2107 #endif
2108         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2109 };
2110
2111 static struct video_device gspca_template = {
2112         .name = "gspca main driver",
2113         .fops = &dev_fops,
2114         .ioctl_ops = &dev_ioctl_ops,
2115         .release = gspca_release,
2116 };
2117
2118 /*
2119  * probe and create a new gspca device
2120  *
2121  * This function must be called by the sub-driver when it is
2122  * called for probing a new device.
2123  */
2124 int gspca_dev_probe2(struct usb_interface *intf,
2125                 const struct usb_device_id *id,
2126                 const struct sd_desc *sd_desc,
2127                 int dev_size,
2128                 struct module *module)
2129 {
2130         struct gspca_dev *gspca_dev;
2131         struct usb_device *dev = interface_to_usbdev(intf);
2132         int ret;
2133
2134         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2135
2136         /* create the device */
2137         if (dev_size < sizeof *gspca_dev)
2138                 dev_size = sizeof *gspca_dev;
2139         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2140         if (!gspca_dev) {
2141                 err("couldn't kzalloc gspca struct");
2142                 return -ENOMEM;
2143         }
2144         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2145         if (!gspca_dev->usb_buf) {
2146                 err("out of memory");
2147                 ret = -ENOMEM;
2148                 goto out;
2149         }
2150         gspca_dev->dev = dev;
2151         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2152         gspca_dev->nbalt = intf->num_altsetting;
2153
2154         /* check if any audio device */
2155         if (dev->config->desc.bNumInterfaces != 1) {
2156                 int i;
2157                 struct usb_interface *intf2;
2158
2159                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2160                         intf2 = dev->config->interface[i];
2161                         if (intf2 != NULL
2162                          && intf2->altsetting != NULL
2163                          && intf2->altsetting->desc.bInterfaceClass ==
2164                                          USB_CLASS_AUDIO) {
2165                                 gspca_dev->audio = 1;
2166                                 break;
2167                         }
2168                 }
2169         }
2170
2171         gspca_dev->sd_desc = sd_desc;
2172         gspca_dev->nbufread = 2;
2173         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2174
2175         /* configure the subdriver and initialize the USB device */
2176         ret = sd_desc->config(gspca_dev, id);
2177         if (ret < 0)
2178                 goto out;
2179         ret = sd_desc->init(gspca_dev);
2180         if (ret < 0)
2181                 goto out;
2182         gspca_set_default_mode(gspca_dev);
2183
2184         ret = gspca_input_connect(gspca_dev);
2185         if (ret)
2186                 goto out;
2187
2188         mutex_init(&gspca_dev->usb_lock);
2189         mutex_init(&gspca_dev->read_lock);
2190         mutex_init(&gspca_dev->queue_lock);
2191         init_waitqueue_head(&gspca_dev->wq);
2192
2193         /* init video stuff */
2194         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2195         gspca_dev->vdev.parent = &intf->dev;
2196         gspca_dev->module = module;
2197         gspca_dev->present = 1;
2198         ret = video_register_device(&gspca_dev->vdev,
2199                                   VFL_TYPE_GRABBER,
2200                                   -1);
2201         if (ret < 0) {
2202                 err("video_register_device err %d", ret);
2203                 goto out;
2204         }
2205
2206         usb_set_intfdata(intf, gspca_dev);
2207         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2208
2209         gspca_input_create_urb(gspca_dev);
2210
2211         return 0;
2212 out:
2213 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2214         if (gspca_dev->input_dev)
2215                 input_unregister_device(gspca_dev->input_dev);
2216 #endif
2217         kfree(gspca_dev->usb_buf);
2218         kfree(gspca_dev);
2219         return ret;
2220 }
2221 EXPORT_SYMBOL(gspca_dev_probe2);
2222
2223 /* same function as the previous one, but check the interface */
2224 int gspca_dev_probe(struct usb_interface *intf,
2225                 const struct usb_device_id *id,
2226                 const struct sd_desc *sd_desc,
2227                 int dev_size,
2228                 struct module *module)
2229 {
2230         struct usb_device *dev = interface_to_usbdev(intf);
2231
2232         /* we don't handle multi-config cameras */
2233         if (dev->descriptor.bNumConfigurations != 1) {
2234                 PDEBUG(D_ERR, "%04x:%04x too many config",
2235                                 id->idVendor, id->idProduct);
2236                 return -ENODEV;
2237         }
2238
2239         /* the USB video interface must be the first one */
2240         if (dev->config->desc.bNumInterfaces != 1
2241          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2242                 return -ENODEV;
2243
2244         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2245 }
2246 EXPORT_SYMBOL(gspca_dev_probe);
2247
2248 /*
2249  * USB disconnection
2250  *
2251  * This function must be called by the sub-driver
2252  * when the device disconnects, after the specific resources are freed.
2253  */
2254 void gspca_disconnect(struct usb_interface *intf)
2255 {
2256         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2257 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2258         struct input_dev *input_dev;
2259 #endif
2260
2261         PDEBUG(D_PROBE, "%s disconnect",
2262                 video_device_node_name(&gspca_dev->vdev));
2263         mutex_lock(&gspca_dev->usb_lock);
2264         gspca_dev->present = 0;
2265
2266         if (gspca_dev->streaming) {
2267                 destroy_urbs(gspca_dev);
2268                 wake_up_interruptible(&gspca_dev->wq);
2269         }
2270
2271 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2272         gspca_input_destroy_urb(gspca_dev);
2273         input_dev = gspca_dev->input_dev;
2274         if (input_dev) {
2275                 gspca_dev->input_dev = NULL;
2276                 input_unregister_device(input_dev);
2277         }
2278 #endif
2279
2280         /* the device is freed at exit of this function */
2281         gspca_dev->dev = NULL;
2282         mutex_unlock(&gspca_dev->usb_lock);
2283
2284         usb_set_intfdata(intf, NULL);
2285
2286         /* release the device */
2287         /* (this will call gspca_release() immediatly or on last close) */
2288         video_unregister_device(&gspca_dev->vdev);
2289
2290 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2291 }
2292 EXPORT_SYMBOL(gspca_disconnect);
2293
2294 #ifdef CONFIG_PM
2295 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2296 {
2297         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2298
2299         if (!gspca_dev->streaming)
2300                 return 0;
2301         gspca_dev->frozen = 1;          /* avoid urb error messages */
2302         if (gspca_dev->sd_desc->stopN)
2303                 gspca_dev->sd_desc->stopN(gspca_dev);
2304         destroy_urbs(gspca_dev);
2305         gspca_input_destroy_urb(gspca_dev);
2306         gspca_set_alt0(gspca_dev);
2307         if (gspca_dev->sd_desc->stop0)
2308                 gspca_dev->sd_desc->stop0(gspca_dev);
2309         return 0;
2310 }
2311 EXPORT_SYMBOL(gspca_suspend);
2312
2313 int gspca_resume(struct usb_interface *intf)
2314 {
2315         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2316
2317         gspca_dev->frozen = 0;
2318         gspca_dev->sd_desc->init(gspca_dev);
2319         gspca_input_create_urb(gspca_dev);
2320         if (gspca_dev->streaming)
2321                 return gspca_init_transfer(gspca_dev);
2322         return 0;
2323 }
2324 EXPORT_SYMBOL(gspca_resume);
2325 #endif
2326 /* -- cam driver utility functions -- */
2327
2328 /* auto gain and exposure algorithm based on the knee algorithm described here:
2329    http://ytse.tricolour.net/docs/LowLightOptimization.html
2330
2331    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2332    where changed. */
2333 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2334         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2335 {
2336         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2337         const struct ctrl *gain_ctrl = NULL;
2338         const struct ctrl *exposure_ctrl = NULL;
2339         const struct ctrl *autogain_ctrl = NULL;
2340         int retval = 0;
2341
2342         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2343                 if (gspca_dev->ctrl_dis & (1 << i))
2344                         continue;
2345                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2346                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2347                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2348                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2349                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2350                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2351         }
2352         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2353                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2354                         "on cam without (auto)gain/exposure");
2355                 return 0;
2356         }
2357
2358         if (gain_ctrl->get(gspca_dev, &gain) ||
2359                         exposure_ctrl->get(gspca_dev, &exposure) ||
2360                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2361                 return 0;
2362
2363         orig_gain = gain;
2364         orig_exposure = exposure;
2365
2366         /* If we are of a multiple of deadzone, do multiple steps to reach the
2367            desired lumination fast (with the risc of a slight overshoot) */
2368         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2369
2370         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2371                 avg_lum, desired_avg_lum, steps);
2372
2373         for (i = 0; i < steps; i++) {
2374                 if (avg_lum > desired_avg_lum) {
2375                         if (gain > gain_knee)
2376                                 gain--;
2377                         else if (exposure > exposure_knee)
2378                                 exposure--;
2379                         else if (gain > gain_ctrl->qctrl.default_value)
2380                                 gain--;
2381                         else if (exposure > exposure_ctrl->qctrl.minimum)
2382                                 exposure--;
2383                         else if (gain > gain_ctrl->qctrl.minimum)
2384                                 gain--;
2385                         else
2386                                 break;
2387                 } else {
2388                         if (gain < gain_ctrl->qctrl.default_value)
2389                                 gain++;
2390                         else if (exposure < exposure_knee)
2391                                 exposure++;
2392                         else if (gain < gain_knee)
2393                                 gain++;
2394                         else if (exposure < exposure_ctrl->qctrl.maximum)
2395                                 exposure++;
2396                         else if (gain < gain_ctrl->qctrl.maximum)
2397                                 gain++;
2398                         else
2399                                 break;
2400                 }
2401         }
2402
2403         if (gain != orig_gain) {
2404                 gain_ctrl->set(gspca_dev, gain);
2405                 retval = 1;
2406         }
2407         if (exposure != orig_exposure) {
2408                 exposure_ctrl->set(gspca_dev, exposure);
2409                 retval = 1;
2410         }
2411
2412         return retval;
2413 }
2414 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2415
2416 /* -- module insert / remove -- */
2417 static int __init gspca_init(void)
2418 {
2419         info("main v%d.%d.%d registered",
2420                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2421                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2422                 DRIVER_VERSION_NUMBER & 0xff);
2423         return 0;
2424 }
2425 static void __exit gspca_exit(void)
2426 {
2427         info("main deregistered");
2428 }
2429
2430 module_init(gspca_init);
2431 module_exit(gspca_exit);
2432
2433 #ifdef GSPCA_DEBUG
2434 module_param_named(debug, gspca_debug, int, 0644);
2435 MODULE_PARM_DESC(debug,
2436                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2437                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2438                 " 0x0100: v4l2");
2439 #endif