drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #define MODULE_NAME "gspca"
  22
  23 #include <linux/init.h>
  24 #include <linux/fs.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/mm.h>
  29 #include <linux/string.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/io.h>
  32 #include <asm/page.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/jiffies.h>
  35
  36 #include "gspca.h"
  37
  38 /* global values */
  39 #define DEF_NURBS 2             /* default number of URBs */
  40
  41 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  42 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  43 MODULE_LICENSE("GPL");
  44
  45 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 1, 6)
  46 static const char version[] = "2.1.6";
  47
  48 static int video_nr = -1;
  49
  50 #ifdef CONFIG_VIDEO_ADV_DEBUG
  51 int gspca_debug = D_ERR | D_PROBE;
  52 EXPORT_SYMBOL(gspca_debug);
  53
  54 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  55 {
  56         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  57                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  58                         txt,
  59                         pixfmt & 0xff,
  60                         (pixfmt >> 8) & 0xff,
  61                         (pixfmt >> 16) & 0xff,
  62                         pixfmt >> 24,
  63                         w, h);
  64         } else {
  65                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  66                         txt,
  67                         pixfmt,
  68                         w, h);
  69         }
  70 }
  71 #else
  72 #define PDEBUG_MODE(txt, pixfmt, w, h)
  73 #endif
  74
  75 /* specific memory types - !! should different from V4L2_MEMORY_xxx */
  76 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  77 #define GSPCA_MEMORY_READ 7
  78
  79 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  80
  81 /*
  82  * VMA operations.
  83  */
  84 static void gspca_vm_open(struct vm_area_struct *vma)
  85 {
  86         struct gspca_frame *frame = vma->vm_private_data;
  87
  88         frame->vma_use_count++;
  89         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
  90 }
  91
  92 static void gspca_vm_close(struct vm_area_struct *vma)
  93 {
  94         struct gspca_frame *frame = vma->vm_private_data;
  95
  96         if (--frame->vma_use_count <= 0)
  97                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
  98 }
  99
 100 static struct vm_operations_struct gspca_vm_ops = {
 101         .open           = gspca_vm_open,
 102         .close          = gspca_vm_close,
 103 };
 104
 105 /*
 106  * fill a video frame from an URB and resubmit
 107  */
 108 static void fill_frame(struct gspca_dev *gspca_dev,
 109                         struct urb *urb)
 110 {
 111         struct gspca_frame *frame;
 112         __u8 *data;             /* address of data in the iso message */
 113         int i, j, len, st;
 114         cam_pkt_op pkt_scan;
 115
 116         if (urb->status != 0) {
 117                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 118                 return;         /* disconnection ? */
 119         }
 120         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 121         for (i = 0; i < urb->number_of_packets; i++) {
 122
 123                 /* check the availability of the frame buffer */
 124                 j = gspca_dev->fr_i;
 125                 j = gspca_dev->fr_queue[j];
 126                 frame = &gspca_dev->frame[j];
 127                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 128                                         != V4L2_BUF_FLAG_QUEUED) {
 129                         gspca_dev->last_packet_type = DISCARD_PACKET;
 130                         break;
 131                 }
 132
 133                 /* check the packet status and length */
 134                 len = urb->iso_frame_desc[i].actual_length;
 135                 if (len == 0)
 136                         continue;
 137                 st = urb->iso_frame_desc[i].status;
 138                 if (st) {
 139                         PDEBUG(D_ERR,
 140                                 "ISOC data error: [%d] len=%d, status=%d",
 141                                 i, len, st);
 142                         gspca_dev->last_packet_type = DISCARD_PACKET;
 143                         continue;
 144                 }
 145
 146                 /* let the packet be analyzed by the subdriver */
 147                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 148                         i, urb->iso_frame_desc[i].offset, len);
 149                 data = (__u8 *) urb->transfer_buffer
 150                                         + urb->iso_frame_desc[i].offset;
 151                 pkt_scan(gspca_dev, frame, data, len);
 152         }
 153
 154         /* resubmit the URB */
 155         urb->status = 0;
 156         st = usb_submit_urb(urb, GFP_ATOMIC);
 157         if (st < 0)
 158                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 159 }
 160
 161 /*
 162  * ISOC message interrupt from the USB device
 163  *
 164  * Analyse each packet and call the subdriver for copy to the frame buffer.
 165  */
 166 static void isoc_irq(struct urb *urb
 167 )
 168 {
 169         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 170
 171         PDEBUG(D_PACK, "isoc irq mmap");
 172         if (!gspca_dev->streaming)
 173                 return;
 174         fill_frame(gspca_dev, urb);
 175 }
 176
 177 /*
 178  * add data to the current frame
 179  *
 180  * This function is called by the subdrivers at interrupt level.
 181  *
 182  * To build a frame, these ones must add
 183  *      - one FIRST_PACKET
 184  *      - 0 or many INTER_PACKETs
 185  *      - one LAST_PACKET
 186  * DISCARD_PACKET invalidates the whole frame.
 187  * On LAST_PACKET, a new frame is returned.
 188  */
 189 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 190                                     int packet_type,
 191                                     struct gspca_frame *frame,
 192                                     const __u8 *data,
 193                                     int len)
 194 {
 195         int i, j;
 196
 197         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 198
 199         /* when start of a new frame, if the current frame buffer
 200          * is not queued, discard the whole frame */
 201         if (packet_type == FIRST_PACKET) {
 202                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 203                                                 != V4L2_BUF_FLAG_QUEUED) {
 204                         gspca_dev->last_packet_type = DISCARD_PACKET;
 205                         return frame;
 206                 }
 207                 frame->data_end = frame->data;
 208                 jiffies_to_timeval(get_jiffies_64(),
 209                                    &frame->v4l2_buf.timestamp);
 210                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 211         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 212                 return frame;
 213         }
 214
 215         /* append the packet to the frame buffer */
 216         if (len > 0) {
 217                 if (frame->data_end - frame->data + len
 218                                                  > frame->v4l2_buf.length) {
 219                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 220                                 frame->data_end - frame->data + len,
 221                                 frame->v4l2_buf.length);
 222                         packet_type = DISCARD_PACKET;
 223                 } else {
 224                         memcpy(frame->data_end, data, len);
 225                         frame->data_end += len;
 226                 }
 227         }
 228         gspca_dev->last_packet_type = packet_type;
 229
 230         /* if last packet, wake the application and advance in the queue */
 231         if (packet_type == LAST_PACKET) {
 232                 frame->v4l2_buf.bytesused = frame->data_end - frame->data;
 233                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 234                 frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE;
 235                 atomic_inc(&gspca_dev->nevent);
 236                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 237                 i = (gspca_dev->fr_i + 1) % gspca_dev->nframes;
 238                 gspca_dev->fr_i = i;
 239                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 240                         frame->v4l2_buf.bytesused,
 241                         gspca_dev->fr_q,
 242                         i,
 243                         gspca_dev->fr_o);
 244                 j = gspca_dev->fr_queue[i];
 245                 frame = &gspca_dev->frame[j];
 246         }
 247         return frame;
 248 }
 249 EXPORT_SYMBOL(gspca_frame_add);
 250
 251 static int gspca_is_compressed(__u32 format)
 252 {
 253         switch (format) {
 254         case V4L2_PIX_FMT_MJPEG:
 255         case V4L2_PIX_FMT_JPEG:
 256         case V4L2_PIX_FMT_SPCA561:
 257         case V4L2_PIX_FMT_PAC207:
 258                 return 1;
 259         }
 260         return 0;
 261 }
 262
 263 static void *rvmalloc(unsigned long size)
 264 {
 265         void *mem;
 266         unsigned long adr;
 267
 268 /*      size = PAGE_ALIGN(size);        (already done) */
 269         mem = vmalloc_32(size);
 270         if (mem != NULL) {
 271                 adr = (unsigned long) mem;
 272                 while ((long) size > 0) {
 273                         SetPageReserved(vmalloc_to_page((void *) adr));
 274                         adr += PAGE_SIZE;
 275                         size -= PAGE_SIZE;
 276                 }
 277         }
 278         return mem;
 279 }
 280
 281 static void rvfree(void *mem, long size)
 282 {
 283         unsigned long adr;
 284
 285         adr = (unsigned long) mem;
 286         while (size > 0) {
 287                 ClearPageReserved(vmalloc_to_page((void *) adr));
 288                 adr += PAGE_SIZE;
 289                 size -= PAGE_SIZE;
 290         }
 291         vfree(mem);
 292 }
 293
 294 static int frame_alloc(struct gspca_dev *gspca_dev,
 295                         unsigned int count)
 296 {
 297         struct gspca_frame *frame;
 298         unsigned int frsz;
 299         int i;
 300
 301         i = gspca_dev->curr_mode;
 302         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 303         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 304         frsz = PAGE_ALIGN(frsz);
 305         gspca_dev->frsz = frsz;
 306         if (count > GSPCA_MAX_FRAMES)
 307                 count = GSPCA_MAX_FRAMES;
 308         gspca_dev->frbuf = rvmalloc(frsz * count);
 309         if (!gspca_dev->frbuf) {
 310                 err("frame alloc failed");
 311                 return -ENOMEM;
 312         }
 313         gspca_dev->nframes = count;
 314         for (i = 0; i < count; i++) {
 315                 frame = &gspca_dev->frame[i];
 316                 frame->v4l2_buf.index = i;
 317                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 318                 frame->v4l2_buf.flags = 0;
 319                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 320                 frame->v4l2_buf.length = frsz;
 321                 frame->v4l2_buf.memory = gspca_dev->memory;
 322                 frame->v4l2_buf.sequence = 0;
 323                 frame->data = frame->data_end =
 324                                         gspca_dev->frbuf + i * frsz;
 325                 frame->v4l2_buf.m.offset = i * frsz;
 326         }
 327         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 328         gspca_dev->last_packet_type = DISCARD_PACKET;
 329         gspca_dev->sequence = 0;
 330         atomic_set(&gspca_dev->nevent, 0);
 331         return 0;
 332 }
 333
 334 static void frame_free(struct gspca_dev *gspca_dev)
 335 {
 336         int i;
 337
 338         PDEBUG(D_STREAM, "frame free");
 339         if (gspca_dev->frbuf != NULL) {
 340                 rvfree(gspca_dev->frbuf,
 341                         gspca_dev->nframes * gspca_dev->frsz);
 342                 gspca_dev->frbuf = NULL;
 343                 for (i = 0; i < gspca_dev->nframes; i++)
 344                         gspca_dev->frame[i].data = NULL;
 345         }
 346         gspca_dev->nframes = 0;
 347 }
 348
 349 static void destroy_urbs(struct gspca_dev *gspca_dev)
 350 {
 351         struct urb *urb;
 352         unsigned int i;
 353
 354         PDEBUG(D_STREAM, "kill transfer");
 355         for (i = 0; i < MAX_NURBS; ++i) {
 356                 urb = gspca_dev->urb[i];
 357                 if (urb == NULL)
 358                         break;
 359
 360                 gspca_dev->urb[i] = NULL;
 361                 usb_kill_urb(urb);
 362                 if (urb->transfer_buffer != NULL)
 363                         usb_buffer_free(gspca_dev->dev,
 364                                         urb->transfer_buffer_length,
 365                                         urb->transfer_buffer,
 366                                         urb->transfer_dma);
 367                 usb_free_urb(urb);
 368         }
 369 }
 370
 371 /*
 372  * search an input isochronous endpoint in an alternate setting
 373  */
 374 static struct usb_host_endpoint *alt_isoc(struct usb_host_interface *alt,
 375                                           __u8 epaddr)
 376 {
 377         struct usb_host_endpoint *ep;
 378         int i, attr;
 379
 380         epaddr |= USB_DIR_IN;
 381         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 382                 ep = &alt->endpoint[i];
 383                 if (ep->desc.bEndpointAddress == epaddr) {
 384                         attr = ep->desc.bmAttributes
 385                                                 & USB_ENDPOINT_XFERTYPE_MASK;
 386                         if (attr == USB_ENDPOINT_XFER_ISOC)
 387                                 return ep;
 388                         break;
 389                 }
 390         }
 391         return NULL;
 392 }
 393
 394 /*
 395  * search an input isochronous endpoint
 396  *
 397  * The endpoint is defined by the subdriver.
 398  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 399  * This routine may be called many times when the bandwidth is too small
 400  * (the bandwidth is checked on urb submit).
 401  */
 402 struct usb_host_endpoint *get_isoc_ep(struct gspca_dev *gspca_dev)
 403 {
 404         struct usb_interface *intf;
 405         struct usb_host_endpoint *ep;
 406         int i, ret;
 407
 408         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 409         ep = NULL;
 410         i = gspca_dev->alt;                     /* previous alt setting */
 411         while (--i > 0) {                       /* alt 0 is unusable */
 412                 ep = alt_isoc(&intf->altsetting[i], gspca_dev->cam.epaddr);
 413                 if (ep)
 414                         break;
 415         }
 416         if (ep == NULL) {
 417                 err("no ISOC endpoint found");
 418                 return NULL;
 419         }
 420         PDEBUG(D_STREAM, "use ISOC alt %d ep 0x%02x",
 421                         i, ep->desc.bEndpointAddress);
 422         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 423         if (ret < 0) {
 424                 err("set interface err %d", ret);
 425                 return NULL;
 426         }
 427         gspca_dev->alt = i;             /* memorize the current alt setting */
 428         return ep;
 429 }
 430
 431 /*
 432  * create the isochronous URBs
 433  */
 434 static int create_urbs(struct gspca_dev *gspca_dev,
 435                         struct usb_host_endpoint *ep)
 436 {
 437         struct urb *urb;
 438         int n, nurbs, i, psize, npkt, bsize;
 439
 440         /* calculate the packet size and the number of packets */
 441         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 442
 443         /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 444         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 445         npkt = ISO_MAX_SIZE / psize;
 446         if (npkt > ISO_MAX_PKT)
 447                 npkt = ISO_MAX_PKT;
 448         bsize = psize * npkt;
 449         PDEBUG(D_STREAM,
 450                 "isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize);
 451         nurbs = DEF_NURBS;
 452         gspca_dev->nurbs = nurbs;
 453         for (n = 0; n < nurbs; n++) {
 454                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 455                 if (!urb) {
 456                         err("usb_alloc_urb failed");
 457                         return -ENOMEM;
 458                 }
 459                 urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev,
 460                                                 bsize,
 461                                                 GFP_KERNEL,
 462                                                 &urb->transfer_dma);
 463
 464                 if (urb->transfer_buffer == NULL) {
 465                         usb_free_urb(urb);
 466                         destroy_urbs(gspca_dev);
 467                         err("usb_buffer_urb failed");
 468                         return -ENOMEM;
 469                 }
 470                 gspca_dev->urb[n] = urb;
 471                 urb->dev = gspca_dev->dev;
 472                 urb->context = gspca_dev;
 473                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 474                                             ep->desc.bEndpointAddress);
 475                 urb->transfer_flags = URB_ISO_ASAP
 476                                         | URB_NO_TRANSFER_DMA_MAP;
 477                 urb->interval = ep->desc.bInterval;
 478                 urb->complete = isoc_irq;
 479                 urb->number_of_packets = npkt;
 480                 urb->transfer_buffer_length = bsize;
 481                 for (i = 0; i < npkt; i++) {
 482                         urb->iso_frame_desc[i].length = psize;
 483                         urb->iso_frame_desc[i].offset = psize * i;
 484                 }
 485         }
 486         return 0;
 487 }
 488
 489 /*
 490  * start the USB transfer
 491  */
 492 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 493 {
 494         struct usb_host_endpoint *ep;
 495         int n, ret;
 496
 497         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 498                 return -ERESTARTSYS;
 499
 500         /* set the higher alternate setting and
 501          * loop until urb submit succeeds */
 502         gspca_dev->alt = gspca_dev->nbalt;
 503         for (;;) {
 504                 PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
 505                 ep = get_isoc_ep(gspca_dev);
 506                 if (ep == NULL) {
 507                         ret = -EIO;
 508                         goto out;
 509                 }
 510                 ret = create_urbs(gspca_dev, ep);
 511                 if (ret < 0)
 512                         goto out;
 513
 514                 /* start the cam */
 515                 gspca_dev->sd_desc->start(gspca_dev);
 516                 gspca_dev->streaming = 1;
 517                 atomic_set(&gspca_dev->nevent, 0);
 518
 519                 /* submit the URBs */
 520                 for (n = 0; n < gspca_dev->nurbs; n++) {
 521                         ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL);
 522                         if (ret < 0) {
 523                                 PDEBUG(D_ERR|D_STREAM,
 524                                         "usb_submit_urb [%d] err %d", n, ret);
 525                                 gspca_dev->streaming = 0;
 526                                 destroy_urbs(gspca_dev);
 527                                 if (ret == -ENOSPC)
 528                                         break;  /* try the previous alt */
 529                                 goto out;
 530                         }
 531                 }
 532                 if (ret >= 0)
 533                         break;
 534         }
 535 out:
 536         mutex_unlock(&gspca_dev->usb_lock);
 537         return ret;
 538 }
 539
 540 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 541 {
 542         int ret;
 543
 544         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 545         if (ret < 0)
 546                 PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret);
 547         return ret;
 548 }
 549
 550 /* Note both the queue and the usb lock should be hold when calling this */
 551 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 552 {
 553         gspca_dev->streaming = 0;
 554         atomic_set(&gspca_dev->nevent, 0);
 555         if (gspca_dev->present) {
 556                 gspca_dev->sd_desc->stopN(gspca_dev);
 557                 destroy_urbs(gspca_dev);
 558                 gspca_set_alt0(gspca_dev);
 559                 gspca_dev->sd_desc->stop0(gspca_dev);
 560                 PDEBUG(D_STREAM, "stream off OK");
 561         } else {
 562                 destroy_urbs(gspca_dev);
 563                 atomic_inc(&gspca_dev->nevent);
 564                 wake_up_interruptible(&gspca_dev->wq);
 565                 PDEBUG(D_ERR|D_STREAM, "stream off no device ??");
 566         }
 567 }
 568
 569 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 570 {
 571         int i;
 572
 573         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 574         gspca_dev->curr_mode = i;
 575         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 576         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 577         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 578 }
 579
 580 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 581                         int width, int height)
 582 {
 583         int i;
 584
 585         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 586                 if (width >= gspca_dev->cam.cam_mode[i].width
 587                     && height >= gspca_dev->cam.cam_mode[i].height)
 588                         break;
 589         }
 590         return i;
 591 }
 592
 593 /*
 594  * search a mode with the right pixel format
 595  */
 596 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 597                         int mode,
 598                         int pixfmt)
 599 {
 600         int modeU, modeD;
 601
 602         modeU = modeD = mode;
 603         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 604                 if (--modeD >= 0) {
 605                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 606                                                                 == pixfmt)
 607                                 return modeD;
 608                 }
 609                 if (++modeU < gspca_dev->cam.nmodes) {
 610                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 611                                                                 == pixfmt)
 612                                 return modeU;
 613                 }
 614         }
 615         return -EINVAL;
 616 }
 617
 618 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 619                                 struct v4l2_fmtdesc *fmtdesc)
 620 {
 621         struct gspca_dev *gspca_dev = priv;
 622         int i, j, index;
 623         __u32 fmt_tb[8];
 624
 625         /* give an index to each format */
 626         index = 0;
 627         j = 0;
 628         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 629                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 630                 j = 0;
 631                 for (;;) {
 632                         if (fmt_tb[j] == fmt_tb[index])
 633                                 break;
 634                         j++;
 635                 }
 636                 if (j == index) {
 637                         if (fmtdesc->index == index)
 638                                 break;          /* new format */
 639                         index++;
 640                         if (index >= sizeof fmt_tb / sizeof fmt_tb[0])
 641                                 return -EINVAL;
 642                 }
 643         }
 644         if (i < 0)
 645                 return -EINVAL;         /* no more format */
 646
 647         fmtdesc->pixelformat = fmt_tb[index];
 648         if (gspca_is_compressed(fmt_tb[index]))
 649                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
 650         fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 651         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
 652         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
 653         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
 654         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
 655         fmtdesc->description[4] = '\0';
 656         return 0;
 657 }
 658
 659 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 660                             struct v4l2_format *fmt)
 661 {
 662         struct gspca_dev *gspca_dev = priv;
 663         int mode;
 664
 665         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 666                 return -EINVAL;
 667         mode = gspca_dev->curr_mode;
 668         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 669                 sizeof fmt->fmt.pix);
 670         return 0;
 671 }
 672
 673 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
 674                         struct v4l2_format *fmt)
 675 {
 676         int w, h, mode, mode2;
 677
 678         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 679                 return -EINVAL;
 680         w = fmt->fmt.pix.width;
 681         h = fmt->fmt.pix.height;
 682
 683         /* (luvcview problem) */
 684         if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG)
 685                 fmt->fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;
 686 #ifdef CONFIG_VIDEO_ADV_DEBUG
 687         if (gspca_debug & D_CONF)
 688                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
 689 #endif
 690         /* search the closest mode for width and height */
 691         mode = wxh_to_mode(gspca_dev, w, h);
 692
 693         /* OK if right palette */
 694         if (gspca_dev->cam.cam_mode[mode].pixelformat
 695                                                 != fmt->fmt.pix.pixelformat) {
 696
 697                 /* else, search the closest mode with the same pixel format */
 698                 mode2 = gspca_get_mode(gspca_dev, mode,
 699                                         fmt->fmt.pix.pixelformat);
 700                 if (mode2 >= 0)
 701                         mode = mode2;
 702 /*              else
 703                         ;                * no chance, return this mode */
 704         }
 705         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
 706                 sizeof fmt->fmt.pix);
 707         return mode;                    /* used when s_fmt */
 708 }
 709
 710 static int vidioc_try_fmt_vid_cap(struct file *file,
 711                               void *priv,
 712                               struct v4l2_format *fmt)
 713 {
 714         struct gspca_dev *gspca_dev = priv;
 715         int ret;
 716
 717         ret = try_fmt_vid_cap(gspca_dev, fmt);
 718         if (ret < 0)
 719                 return ret;
 720         return 0;
 721 }
 722
 723 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 724                             struct v4l2_format *fmt)
 725 {
 726         struct gspca_dev *gspca_dev = priv;
 727         int ret;
 728
 729         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 730                 return -ERESTARTSYS;
 731
 732         ret = try_fmt_vid_cap(gspca_dev, fmt);
 733         if (ret < 0)
 734                 goto out;
 735
 736         if (gspca_dev->nframes != 0
 737             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
 738                 ret = -EINVAL;
 739                 goto out;
 740         }
 741
 742         if (ret == gspca_dev->curr_mode) {
 743                 ret = 0;
 744                 goto out;                       /* same mode */
 745         }
 746
 747         if (gspca_dev->streaming) {
 748                 ret = -EBUSY;
 749                 goto out;
 750         }
 751         gspca_dev->width = fmt->fmt.pix.width;
 752         gspca_dev->height = fmt->fmt.pix.height;
 753         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
 754         gspca_dev->curr_mode = ret;
 755
 756         ret = 0;
 757 out:
 758         mutex_unlock(&gspca_dev->queue_lock);
 759         return ret;
 760 }
 761
 762 static int dev_open(struct inode *inode, struct file *file)
 763 {
 764         struct gspca_dev *gspca_dev;
 765         int ret;
 766
 767         PDEBUG(D_STREAM, "%s open", current->comm);
 768         gspca_dev = (struct gspca_dev *) video_devdata(file);
 769         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 770                 return -ERESTARTSYS;
 771         if (!gspca_dev->present) {
 772                 ret = -ENODEV;
 773                 goto out;
 774         }
 775
 776         /* if not done yet, initialize the sensor */
 777         if (gspca_dev->users == 0) {
 778                 if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
 779                         ret = -ERESTARTSYS;
 780                         goto out;
 781                 }
 782                 ret = gspca_dev->sd_desc->open(gspca_dev);
 783                 mutex_unlock(&gspca_dev->usb_lock);
 784                 if (ret != 0) {
 785                         PDEBUG(D_ERR|D_CONF, "init device failed %d", ret);
 786                         goto out;
 787                 }
 788         } else if (gspca_dev->users > 4) {      /* (arbitrary value) */
 789                 ret = -EBUSY;
 790                 goto out;
 791         }
 792         gspca_dev->users++;
 793         file->private_data = gspca_dev;
 794 #ifdef CONFIG_VIDEO_ADV_DEBUG
 795         /* activate the v4l2 debug */
 796         if (gspca_debug & D_V4L2)
 797                 gspca_dev->vdev.debug |= 3;
 798         else
 799                 gspca_dev->vdev.debug &= ~3;
 800 #endif
 801 out:
 802         mutex_unlock(&gspca_dev->queue_lock);
 803         if (ret != 0)
 804                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
 805         else
 806                 PDEBUG(D_STREAM, "open done");
 807         return ret;
 808 }
 809
 810 static int dev_close(struct inode *inode, struct file *file)
 811 {
 812         struct gspca_dev *gspca_dev = file->private_data;
 813
 814         PDEBUG(D_STREAM, "%s close", current->comm);
 815         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 816                 return -ERESTARTSYS;
 817         gspca_dev->users--;
 818
 819         /* if the file did capture, free the streaming resources */
 820         if (gspca_dev->capt_file == file) {
 821                 mutex_lock(&gspca_dev->usb_lock);
 822                 if (gspca_dev->streaming)
 823                         gspca_stream_off(gspca_dev);
 824                 gspca_dev->sd_desc->close(gspca_dev);
 825                 mutex_unlock(&gspca_dev->usb_lock);
 826                 frame_free(gspca_dev);
 827                 gspca_dev->capt_file = NULL;
 828                 gspca_dev->memory = GSPCA_MEMORY_NO;
 829         }
 830         file->private_data = NULL;
 831         mutex_unlock(&gspca_dev->queue_lock);
 832         PDEBUG(D_STREAM, "close done");
 833         return 0;
 834 }
 835
 836 static int vidioc_querycap(struct file *file, void  *priv,
 837                            struct v4l2_capability *cap)
 838 {
 839         struct gspca_dev *gspca_dev = priv;
 840
 841         memset(cap, 0, sizeof *cap);
 842         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
 843         strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card);
 844         strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name,
 845                 sizeof cap->bus_info);
 846         cap->version = DRIVER_VERSION_NUMBER;
 847         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 848                           | V4L2_CAP_STREAMING
 849                           | V4L2_CAP_READWRITE;
 850         return 0;
 851 }
 852
 853 /* the use of V4L2_CTRL_FLAG_NEXT_CTRL asks for the controls to be sorted */
 854 static int vidioc_queryctrl(struct file *file, void *priv,
 855                            struct v4l2_queryctrl *q_ctrl)
 856 {
 857         struct gspca_dev *gspca_dev = priv;
 858         int i;
 859         u32 id;
 860
 861         id = q_ctrl->id;
 862         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
 863                 id &= V4L2_CTRL_ID_MASK;
 864                 id++;
 865                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 866                         if (id >= gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 867                                 memcpy(q_ctrl,
 868                                         &gspca_dev->sd_desc->ctrls[i].qctrl,
 869                                         sizeof *q_ctrl);
 870                                 return 0;
 871                         }
 872                 }
 873                 return -EINVAL;
 874         }
 875         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
 876                 if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) {
 877                         memcpy(q_ctrl,
 878                                 &gspca_dev->sd_desc->ctrls[i].qctrl,
 879                                 sizeof *q_ctrl);
 880                         return 0;
 881                 }
 882         }
 883         if (id >= V4L2_CID_BASE
 884             && id <= V4L2_CID_LASTP1) {
 885                 q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 886                 return 0;
 887         }
 888         return -EINVAL;
 889 }
 890
 891 static int vidioc_s_ctrl(struct file *file, void *priv,
 892                          struct v4l2_control *ctrl)
 893 {
 894         struct gspca_dev *gspca_dev = priv;
 895         const struct ctrl *ctrls;
 896         int i, ret;
 897
 898         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 899              i < gspca_dev->sd_desc->nctrls;
 900              i++, ctrls++) {
 901                 if (ctrl->id != ctrls->qctrl.id)
 902                         continue;
 903                 if (ctrl->value < ctrls->qctrl.minimum
 904                     && ctrl->value > ctrls->qctrl.maximum)
 905                         return -ERANGE;
 906                 PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
 907                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 908                         return -ERESTARTSYS;
 909                 ret = ctrls->set(gspca_dev, ctrl->value);
 910                 mutex_unlock(&gspca_dev->usb_lock);
 911                 return ret;
 912         }
 913         return -EINVAL;
 914 }
 915
 916 static int vidioc_g_ctrl(struct file *file, void *priv,
 917                          struct v4l2_control *ctrl)
 918 {
 919         struct gspca_dev *gspca_dev = priv;
 920
 921         const struct ctrl *ctrls;
 922         int i, ret;
 923
 924         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
 925              i < gspca_dev->sd_desc->nctrls;
 926              i++, ctrls++) {
 927                 if (ctrl->id != ctrls->qctrl.id)
 928                         continue;
 929                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 930                         return -ERESTARTSYS;
 931                 ret = ctrls->get(gspca_dev, &ctrl->value);
 932                 mutex_unlock(&gspca_dev->usb_lock);
 933                 return ret;
 934         }
 935         return -EINVAL;
 936 }
 937
 938 static int vidioc_querymenu(struct file *file, void *priv,
 939                             struct v4l2_querymenu *qmenu)
 940 {
 941         struct gspca_dev *gspca_dev = priv;
 942
 943         if (!gspca_dev->sd_desc->querymenu)
 944                 return -EINVAL;
 945         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
 946 }
 947
 948 static int vidioc_enum_input(struct file *file, void *priv,
 949                                 struct v4l2_input *input)
 950 {
 951         struct gspca_dev *gspca_dev = priv;
 952
 953         if (input->index != 0)
 954                 return -EINVAL;
 955         memset(input, 0, sizeof *input);
 956         input->type = V4L2_INPUT_TYPE_CAMERA;
 957         strncpy(input->name, gspca_dev->sd_desc->name,
 958                 sizeof input->name);
 959         return 0;
 960 }
 961
 962 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 963 {
 964         *i = 0;
 965         return 0;
 966 }
 967
 968 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 969 {
 970         if (i > 0)
 971                 return -EINVAL;
 972         return (0);
 973 }
 974
 975 static int vidioc_reqbufs(struct file *file, void *priv,
 976                           struct v4l2_requestbuffers *rb)
 977 {
 978         struct gspca_dev *gspca_dev = priv;
 979         int i, ret = 0;
 980
 981         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 982                 return -EINVAL;
 983         switch (rb->memory) {
 984         case GSPCA_MEMORY_READ:
 985         case V4L2_MEMORY_MMAP:
 986         case V4L2_MEMORY_USERPTR:
 987                 break;
 988         default:
 989                 return -EINVAL;
 990         }
 991         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
 992                 return -ERESTARTSYS;
 993
 994         /* only one file may do capture */
 995         if ((gspca_dev->capt_file != NULL && gspca_dev->capt_file != file)
 996             || gspca_dev->streaming) {
 997                 ret = -EBUSY;
 998                 goto out;
 999         }
1000
1001         if (rb->count == 0) {                   /* unrequest */
1002                 for (i = 0; i < gspca_dev->nframes; i++) {
1003                         if (gspca_dev->frame[i].vma_use_count) {
1004                                 ret = -EBUSY;
1005                                 goto out;
1006                         }
1007                 }
1008                 frame_free(gspca_dev);
1009                 gspca_dev->capt_file = NULL;
1010         } else {
1011                 if (gspca_dev->nframes != 0) {
1012                         ret = -EBUSY;
1013                         goto out;
1014                 }
1015                 gspca_dev->memory = rb->memory;
1016                 ret = frame_alloc(gspca_dev, rb->count);
1017                 if (ret == 0) {
1018                         rb->count = gspca_dev->nframes;
1019                         gspca_dev->capt_file = file;
1020                 }
1021         }
1022 out:
1023         mutex_unlock(&gspca_dev->queue_lock);
1024         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1025         return ret;
1026 }
1027
1028 static int vidioc_querybuf(struct file *file, void *priv,
1029                            struct v4l2_buffer *v4l2_buf)
1030 {
1031         struct gspca_dev *gspca_dev = priv;
1032         struct gspca_frame *frame;
1033
1034         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1035             || v4l2_buf->index < 0
1036             || v4l2_buf->index >= gspca_dev->nframes)
1037                 return -EINVAL;
1038
1039         frame = &gspca_dev->frame[v4l2_buf->index];
1040         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1041         return 0;
1042 }
1043
1044 static int vidioc_streamon(struct file *file, void *priv,
1045                            enum v4l2_buf_type buf_type)
1046 {
1047         struct gspca_dev *gspca_dev = priv;
1048         int ret;
1049
1050         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1051                 return -EINVAL;
1052         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1053                 return -ERESTARTSYS;
1054         if (!gspca_dev->present) {
1055                 ret = -ENODEV;
1056                 goto out;
1057         }
1058         if (gspca_dev->nframes == 0) {
1059                 ret = -EINVAL;
1060                 goto out;
1061         }
1062         if (gspca_dev->capt_file != file) {
1063                 ret = -EINVAL;
1064                 goto out;
1065         }
1066         if (!gspca_dev->streaming) {
1067                 ret = gspca_init_transfer(gspca_dev);
1068                 if (ret < 0)
1069                         goto out;
1070         }
1071 #ifdef CONFIG_VIDEO_ADV_DEBUG
1072         if (gspca_debug & D_STREAM) {
1073                 PDEBUG_MODE("stream on OK",
1074                         gspca_dev->pixfmt,
1075                         gspca_dev->width,
1076                         gspca_dev->height);
1077         }
1078 #endif
1079         ret = 0;
1080 out:
1081         mutex_unlock(&gspca_dev->queue_lock);
1082         return ret;
1083 }
1084
1085 static int vidioc_streamoff(struct file *file, void *priv,
1086                                 enum v4l2_buf_type buf_type)
1087 {
1088         struct gspca_dev *gspca_dev = priv;
1089         int ret;
1090
1091         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1092                 return -EINVAL;
1093         if (!gspca_dev->streaming)
1094                 return 0;
1095         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1096                 return -ERESTARTSYS;
1097         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1098                 ret = -ERESTARTSYS;
1099                 goto out;
1100         }
1101         if (gspca_dev->capt_file != file) {
1102                 ret = -EINVAL;
1103                 goto out2;
1104         }
1105         gspca_stream_off(gspca_dev);
1106         ret = 0;
1107 out2:
1108         mutex_unlock(&gspca_dev->usb_lock);
1109 out:
1110         mutex_unlock(&gspca_dev->queue_lock);
1111         return ret;
1112 }
1113
1114 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1115                         struct v4l2_jpegcompression *jpegcomp)
1116 {
1117         struct gspca_dev *gspca_dev = priv;
1118         int ret;
1119
1120         if (!gspca_dev->sd_desc->get_jcomp)
1121                 return -EINVAL;
1122         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1123                 return -ERESTARTSYS;
1124         ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1125         mutex_unlock(&gspca_dev->usb_lock);
1126         return ret;
1127 }
1128
1129 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1130                         struct v4l2_jpegcompression *jpegcomp)
1131 {
1132         struct gspca_dev *gspca_dev = priv;
1133         int ret;
1134
1135         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1136                 return -ERESTARTSYS;
1137         if (!gspca_dev->sd_desc->set_jcomp)
1138                 return -EINVAL;
1139         ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1140         mutex_unlock(&gspca_dev->usb_lock);
1141         return ret;
1142 }
1143
1144 static int vidioc_g_parm(struct file *filp, void *priv,
1145                         struct v4l2_streamparm *parm)
1146 {
1147         struct gspca_dev *gspca_dev = priv;
1148
1149         memset(parm, 0, sizeof *parm);
1150         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1151         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1152         return 0;
1153 }
1154
1155 static int vidioc_s_parm(struct file *filp, void *priv,
1156                         struct v4l2_streamparm *parm)
1157 {
1158         struct gspca_dev *gspca_dev = priv;
1159         int n;
1160
1161         n = parm->parm.capture.readbuffers;
1162         if (n == 0 || n > GSPCA_MAX_FRAMES)
1163                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1164         else
1165                 gspca_dev->nbufread = n;
1166         return 0;
1167 }
1168
1169 static int vidioc_s_std(struct file *filp, void *priv,
1170                         v4l2_std_id *parm)
1171 {
1172         return 0;
1173 }
1174
1175 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1176 static int vidiocgmbuf(struct file *file, void *priv,
1177                         struct video_mbuf *mbuf)
1178 {
1179         struct gspca_dev *gspca_dev = file->private_data;
1180         int i;
1181
1182         PDEBUG(D_STREAM, "cgmbuf");
1183         if (gspca_dev->nframes == 0) {
1184                 int ret;
1185
1186                 {
1187                         struct v4l2_format fmt;
1188
1189                         memset(&fmt, 0, sizeof fmt);
1190                         fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1191                         i = gspca_dev->cam.nmodes - 1;  /* highest mode */
1192                         fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width;
1193                         fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height;
1194                         fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24;
1195                         ret = vidioc_s_fmt_vid_cap(file, priv, &fmt);
1196                         if (ret != 0)
1197                                 return ret;
1198                 }
1199                 {
1200                         struct v4l2_requestbuffers rb;
1201
1202                         memset(&rb, 0, sizeof rb);
1203                         rb.count = 4;
1204                         rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1205                         rb.memory = V4L2_MEMORY_MMAP;
1206                         ret = vidioc_reqbufs(file, priv, &rb);
1207                         if (ret != 0)
1208                                 return ret;
1209                 }
1210         }
1211         mbuf->frames = gspca_dev->nframes;
1212         mbuf->size = gspca_dev->frsz * gspca_dev->nframes;
1213         for (i = 0; i < mbuf->frames; i++)
1214                 mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset;
1215         return 0;
1216 }
1217 #endif
1218
1219 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1220 {
1221         struct gspca_dev *gspca_dev = file->private_data;
1222         struct gspca_frame *frame;
1223         struct page *page;
1224         unsigned long addr, start, size;
1225         int i, ret;
1226
1227         start = vma->vm_start;
1228         size = vma->vm_end - vma->vm_start;
1229         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1230
1231         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1232                 return -ERESTARTSYS;
1233         if (!gspca_dev->present) {
1234                 ret = -ENODEV;
1235                 goto out;
1236         }
1237         if (gspca_dev->capt_file != file) {
1238                 ret = -EINVAL;
1239                 goto out;
1240         }
1241
1242         frame = NULL;
1243         for (i = 0; i < gspca_dev->nframes; ++i) {
1244                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1245                         PDEBUG(D_STREAM, "mmap bad memory type");
1246                         break;
1247                 }
1248                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1249                                                 == vma->vm_pgoff) {
1250                         frame = &gspca_dev->frame[i];
1251                         break;
1252                 }
1253         }
1254         if (frame == NULL) {
1255                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1256                 ret = -EINVAL;
1257                 goto out;
1258         }
1259 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1260         /* v4l1 maps all the buffers */
1261         if (i != 0
1262             || size != frame->v4l2_buf.length * gspca_dev->nframes)
1263 #endif
1264             if (size != frame->v4l2_buf.length) {
1265                 PDEBUG(D_STREAM, "mmap bad size");
1266                 ret = -EINVAL;
1267                 goto out;
1268         }
1269
1270         /*
1271          * - VM_IO marks the area as being a mmaped region for I/O to a
1272          *   device. It also prevents the region from being core dumped.
1273          */
1274         vma->vm_flags |= VM_IO;
1275
1276         addr = (unsigned long) frame->data;
1277         while (size > 0) {
1278                 page = vmalloc_to_page((void *) addr);
1279                 ret = vm_insert_page(vma, start, page);
1280                 if (ret < 0)
1281                         goto out;
1282                 start += PAGE_SIZE;
1283                 addr += PAGE_SIZE;
1284                 size -= PAGE_SIZE;
1285         }
1286
1287         vma->vm_ops = &gspca_vm_ops;
1288         vma->vm_private_data = frame;
1289         gspca_vm_open(vma);
1290         ret = 0;
1291 out:
1292         mutex_unlock(&gspca_dev->queue_lock);
1293         return ret;
1294 }
1295
1296 /*
1297  * wait for a video frame
1298  *
1299  * If a frame is ready, its index is returned.
1300  */
1301 static int frame_wait(struct gspca_dev *gspca_dev,
1302                         int nonblock_ing)
1303 {
1304         struct gspca_frame *frame;
1305         int i, j, ret;
1306
1307         /* check if a frame is ready */
1308         i = gspca_dev->fr_o;
1309         j = gspca_dev->fr_queue[i];
1310         frame = &gspca_dev->frame[j];
1311         if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) {
1312                 atomic_dec(&gspca_dev->nevent);
1313                 goto ok;
1314         }
1315         if (nonblock_ing)                       /* no frame yet */
1316                 return -EAGAIN;
1317
1318         /* wait till a frame is ready */
1319         for (;;) {
1320                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1321                                         atomic_read(&gspca_dev->nevent) > 0,
1322                                         msecs_to_jiffies(3000));
1323                 if (ret <= 0) {
1324                         if (ret < 0)
1325                                 return ret;     /* interrupt */
1326                         return -EIO;            /* timeout */
1327                 }
1328                 atomic_dec(&gspca_dev->nevent);
1329                 if (!gspca_dev->streaming || !gspca_dev->present)
1330                         return -EIO;
1331                 i = gspca_dev->fr_o;
1332                 j = gspca_dev->fr_queue[i];
1333                 frame = &gspca_dev->frame[j];
1334                 if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1335                         break;
1336         }
1337 ok:
1338         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1339         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1340                 gspca_dev->fr_q,
1341                 gspca_dev->fr_i,
1342                 gspca_dev->fr_o);
1343
1344         if (gspca_dev->sd_desc->dq_callback)
1345                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1346
1347         return j;
1348 }
1349
1350 /*
1351  * dequeue a video buffer
1352  *
1353  * If nonblock_ing is false, block until a buffer is available.
1354  */
1355 static int vidioc_dqbuf(struct file *file, void *priv,
1356                         struct v4l2_buffer *v4l2_buf)
1357 {
1358         struct gspca_dev *gspca_dev = priv;
1359         struct gspca_frame *frame;
1360         int i, ret;
1361
1362         PDEBUG(D_FRAM, "dqbuf");
1363         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1364                 return -EINVAL;
1365         if (v4l2_buf->memory != gspca_dev->memory)
1366                 return -EINVAL;
1367         if (!gspca_dev->streaming)
1368                 return -EINVAL;
1369         if (gspca_dev->capt_file != file) {
1370                 ret = -EINVAL;
1371                 goto out;
1372         }
1373
1374         /* only one read */
1375         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1376                 return -ERESTARTSYS;
1377
1378         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1379         if (ret < 0)
1380                 goto out;
1381         i = ret;                                /* frame index */
1382         frame = &gspca_dev->frame[i];
1383         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1384                 if (copy_to_user((__u8 *) frame->v4l2_buf.m.userptr,
1385                                  frame->data,
1386                                  frame->v4l2_buf.bytesused)) {
1387                         PDEBUG(D_ERR|D_STREAM,
1388                                 "dqbuf cp to user failed");
1389                         ret = -EFAULT;
1390                         goto out;
1391                 }
1392         }
1393         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1394         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1395         PDEBUG(D_FRAM, "dqbuf %d", i);
1396         ret = 0;
1397 out:
1398         mutex_unlock(&gspca_dev->read_lock);
1399         return ret;
1400 }
1401
1402 /*
1403  * queue a video buffer
1404  *
1405  * Attempting to queue a buffer that has already been
1406  * queued will return -EINVAL.
1407  */
1408 static int vidioc_qbuf(struct file *file, void *priv,
1409                         struct v4l2_buffer *v4l2_buf)
1410 {
1411         struct gspca_dev *gspca_dev = priv;
1412         struct gspca_frame *frame;
1413         int i, index, ret;
1414
1415         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1416         if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1417                 return -EINVAL;
1418
1419         index = v4l2_buf->index;
1420         if ((unsigned) index >= gspca_dev->nframes) {
1421                 PDEBUG(D_FRAM,
1422                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1423                 return -EINVAL;
1424         }
1425         frame = &gspca_dev->frame[index];
1426
1427         if (v4l2_buf->memory != frame->v4l2_buf.memory) {
1428                 PDEBUG(D_FRAM, "qbuf bad memory type");
1429                 return -EINVAL;
1430         }
1431         if (gspca_dev->capt_file != file)
1432                 return -EINVAL;
1433
1434         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1435                 return -ERESTARTSYS;
1436
1437         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1438                 PDEBUG(D_FRAM, "qbuf bad state");
1439                 ret = -EINVAL;
1440                 goto out;
1441         }
1442
1443         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1444 /*      frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
1445
1446         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1447                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1448                 frame->v4l2_buf.length = v4l2_buf->length;
1449         }
1450
1451         /* put the buffer in the 'queued' queue */
1452         i = gspca_dev->fr_q;
1453         gspca_dev->fr_queue[i] = index;
1454         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1455         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1456                 gspca_dev->fr_q,
1457                 gspca_dev->fr_i,
1458                 gspca_dev->fr_o);
1459
1460         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1461         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1462         ret = 0;
1463 out:
1464         mutex_unlock(&gspca_dev->queue_lock);
1465         return ret;
1466 }
1467
1468 /*
1469  * allocate the resources for read()
1470  */
1471 static int read_alloc(struct gspca_dev *gspca_dev,
1472                         struct file *file)
1473 {
1474         struct v4l2_buffer v4l2_buf;
1475         int i, ret;
1476
1477         PDEBUG(D_STREAM, "read alloc");
1478         if (gspca_dev->nframes == 0) {
1479                 struct v4l2_requestbuffers rb;
1480
1481                 memset(&rb, 0, sizeof rb);
1482                 rb.count = gspca_dev->nbufread;
1483                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1484                 rb.memory = GSPCA_MEMORY_READ;
1485                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1486                 if (ret != 0) {
1487                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1488                         return ret;
1489                 }
1490                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1491                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1492                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1493                 for (i = 0; i < gspca_dev->nbufread; i++) {
1494                         v4l2_buf.index = i;
1495 /*fixme: ugly!*/
1496                         gspca_dev->frame[i].v4l2_buf.flags |=
1497                                                         V4L2_BUF_FLAG_MAPPED;
1498                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1499                         if (ret != 0) {
1500                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1501                                 return ret;
1502                         }
1503                 }
1504                 gspca_dev->memory = GSPCA_MEMORY_READ;
1505         }
1506
1507         /* start streaming */
1508         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1509         if (ret != 0)
1510                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1511         return ret;
1512 }
1513
1514 static unsigned int dev_poll(struct file *file, poll_table *wait)
1515 {
1516         struct gspca_dev *gspca_dev = file->private_data;
1517         int i, ret;
1518
1519         PDEBUG(D_FRAM, "poll");
1520
1521         poll_wait(file, &gspca_dev->wq, wait);
1522         if (!gspca_dev->present)
1523                 return POLLERR;
1524
1525         /* if not streaming, the user would use read() */
1526         if (!gspca_dev->streaming) {
1527                 if (gspca_dev->memory != GSPCA_MEMORY_NO) {
1528                         ret = POLLERR;          /* not the 1st time */
1529                         goto out;
1530                 }
1531                 ret = read_alloc(gspca_dev, file);
1532                 if (ret != 0) {
1533                         ret = POLLERR;
1534                         goto out;
1535                 }
1536         }
1537
1538         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1539                 return POLLERR;
1540         if (!gspca_dev->present) {
1541                 ret = POLLERR;
1542                 goto out;
1543         }
1544
1545         i = gspca_dev->fr_o;
1546         i = gspca_dev->fr_queue[i];
1547         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
1548                 ret = POLLIN | POLLRDNORM;      /* something to read */
1549         else
1550                 ret = 0;
1551 out:
1552         mutex_unlock(&gspca_dev->queue_lock);
1553         return ret;
1554 }
1555
1556 static ssize_t dev_read(struct file *file, char __user *data,
1557                     size_t count, loff_t *ppos)
1558 {
1559         struct gspca_dev *gspca_dev = file->private_data;
1560         struct gspca_frame *frame;
1561         struct v4l2_buffer v4l2_buf;
1562         struct timeval timestamp;
1563         int n, ret, ret2;
1564
1565         PDEBUG(D_FRAM, "read (%d)", count);
1566         if (!gspca_dev->present)
1567                 return -ENODEV;
1568         switch (gspca_dev->memory) {
1569         case GSPCA_MEMORY_NO:                   /* first time */
1570                 ret = read_alloc(gspca_dev, file);
1571                 if (ret != 0)
1572                         return ret;
1573                 break;
1574         case GSPCA_MEMORY_READ:
1575                 if (gspca_dev->capt_file == file)
1576                         break;
1577                 /* fall thru */
1578         default:
1579                 return -EINVAL;
1580         }
1581
1582         /* get a frame */
1583         jiffies_to_timeval(get_jiffies_64(), &timestamp);
1584         timestamp.tv_sec--;
1585         n = 2;
1586         for (;;) {
1587                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1588                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1589                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1590                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1591                 if (ret != 0) {
1592                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1593                         return ret;
1594                 }
1595
1596                 /* if the process slept for more than 1 second,
1597                  * get anewer frame */
1598                 frame = &gspca_dev->frame[v4l2_buf.index];
1599                 if (--n < 0)
1600                         break;                  /* avoid infinite loop */
1601                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1602                         break;
1603                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1604                 if (ret != 0) {
1605                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1606                         return ret;
1607                 }
1608         }
1609
1610         /* copy the frame */
1611         if (count > frame->v4l2_buf.bytesused)
1612                 count = frame->v4l2_buf.bytesused;
1613         ret = copy_to_user(data, frame->data, count);
1614         if (ret != 0) {
1615                 PDEBUG(D_ERR|D_STREAM,
1616                         "read cp to user lack %d / %d", ret, count);
1617                 ret = -EFAULT;
1618                 goto out;
1619         }
1620         ret = count;
1621 out:
1622         /* in each case, requeue the buffer */
1623         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1624         if (ret2 != 0)
1625                 return ret2;
1626         return ret;
1627 }
1628
1629 static void dev_release(struct video_device *vfd)
1630 {
1631         /* nothing */
1632 }
1633
1634 static struct file_operations dev_fops = {
1635         .owner = THIS_MODULE,
1636         .open = dev_open,
1637         .release = dev_close,
1638         .read = dev_read,
1639         .mmap = dev_mmap,
1640         .ioctl = video_ioctl2,
1641 #ifdef CONFIG_COMPAT
1642         .compat_ioctl = v4l_compat_ioctl32,
1643 #endif
1644         .llseek = no_llseek,
1645         .poll   = dev_poll,
1646 };
1647
1648 static struct video_device gspca_template = {
1649         .name = "gspca main driver",
1650         .type = VID_TYPE_CAPTURE,
1651         .fops = &dev_fops,
1652         .release = dev_release,         /* mandatory */
1653         .minor = -1,
1654         .vidioc_querycap        = vidioc_querycap,
1655         .vidioc_dqbuf           = vidioc_dqbuf,
1656         .vidioc_qbuf            = vidioc_qbuf,
1657         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1658         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1659         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1660         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1661         .vidioc_streamon        = vidioc_streamon,
1662         .vidioc_queryctrl       = vidioc_queryctrl,
1663         .vidioc_g_ctrl          = vidioc_g_ctrl,
1664         .vidioc_s_ctrl          = vidioc_s_ctrl,
1665         .vidioc_querymenu       = vidioc_querymenu,
1666         .vidioc_enum_input      = vidioc_enum_input,
1667         .vidioc_g_input         = vidioc_g_input,
1668         .vidioc_s_input         = vidioc_s_input,
1669         .vidioc_reqbufs         = vidioc_reqbufs,
1670         .vidioc_querybuf        = vidioc_querybuf,
1671         .vidioc_streamoff       = vidioc_streamoff,
1672         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1673         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1674         .vidioc_g_parm          = vidioc_g_parm,
1675         .vidioc_s_parm          = vidioc_s_parm,
1676         .vidioc_s_std           = vidioc_s_std,
1677 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1678         .vidiocgmbuf          = vidiocgmbuf,
1679 #endif
1680 };
1681
1682 /*
1683  * probe and create a new gspca device
1684  *
1685  * This function must be called by the sub-driver when it is
1686  * called for probing a new device.
1687  */
1688 int gspca_dev_probe(struct usb_interface *intf,
1689                 const struct usb_device_id *id,
1690                 const struct sd_desc *sd_desc,
1691                 int dev_size,
1692                 struct module *module)
1693 {
1694         struct usb_interface_descriptor *interface;
1695         struct gspca_dev *gspca_dev;
1696         struct usb_device *dev = interface_to_usbdev(intf);
1697         int ret;
1698
1699         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
1700
1701         /* we don't handle multi-config cameras */
1702         if (dev->descriptor.bNumConfigurations != 1)
1703                 return -ENODEV;
1704         interface = &intf->cur_altsetting->desc;
1705         if (interface->bInterfaceNumber > 0)
1706                 return -ENODEV;
1707
1708         /* create the device */
1709         if (dev_size < sizeof *gspca_dev)
1710                 dev_size = sizeof *gspca_dev;
1711         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1712         if (gspca_dev == NULL) {
1713                 err("couldn't kzalloc gspca struct");
1714                 return -EIO;
1715         }
1716         gspca_dev->dev = dev;
1717         gspca_dev->iface = interface->bInterfaceNumber;
1718         gspca_dev->nbalt = intf->num_altsetting;
1719         gspca_dev->sd_desc = sd_desc;
1720 /*      gspca_dev->users = 0;                   (done by kzalloc) */
1721         gspca_dev->nbufread = 2;
1722
1723         /* configure the subdriver */
1724         ret = gspca_dev->sd_desc->config(gspca_dev, id);
1725         if (ret < 0)
1726                 goto out;
1727         ret = gspca_set_alt0(gspca_dev);
1728         if (ret < 0)
1729                 goto out;
1730         gspca_set_default_mode(gspca_dev);
1731
1732         mutex_init(&gspca_dev->usb_lock);
1733         mutex_init(&gspca_dev->read_lock);
1734         mutex_init(&gspca_dev->queue_lock);
1735         init_waitqueue_head(&gspca_dev->wq);
1736
1737         /* init video stuff */
1738         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
1739         gspca_dev->vdev.dev = &dev->dev;
1740         memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops);
1741         gspca_dev->vdev.fops = &gspca_dev->fops;
1742         gspca_dev->fops.owner = module;         /* module protection */
1743         ret = video_register_device(&gspca_dev->vdev,
1744                                   VFL_TYPE_GRABBER,
1745                                   video_nr);
1746         if (ret < 0) {
1747                 err("video_register_device err %d", ret);
1748                 goto out;
1749         }
1750
1751         gspca_dev->present = 1;
1752         usb_set_intfdata(intf, gspca_dev);
1753         PDEBUG(D_PROBE, "probe ok");
1754         return 0;
1755 out:
1756         kfree(gspca_dev);
1757         return ret;
1758 }
1759 EXPORT_SYMBOL(gspca_dev_probe);
1760
1761 /*
1762  * USB disconnection
1763  *
1764  * This function must be called by the sub-driver
1765  * when the device disconnects, after the specific resources are freed.
1766  */
1767 void gspca_disconnect(struct usb_interface *intf)
1768 {
1769         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1770
1771         if (!gspca_dev)
1772                 return;
1773         gspca_dev->present = 0;
1774         mutex_lock(&gspca_dev->queue_lock);
1775         mutex_lock(&gspca_dev->usb_lock);
1776         gspca_dev->streaming = 0;
1777         destroy_urbs(gspca_dev);
1778         mutex_unlock(&gspca_dev->usb_lock);
1779         mutex_unlock(&gspca_dev->queue_lock);
1780         while (gspca_dev->users != 0) {         /* wait until fully closed */
1781                 atomic_inc(&gspca_dev->nevent);
1782                 wake_up_interruptible(&gspca_dev->wq);  /* wake processes */
1783                 schedule();
1784         }
1785 /* We don't want people trying to open up the device */
1786         video_unregister_device(&gspca_dev->vdev);
1787 /* Free the memory */
1788         kfree(gspca_dev);
1789         PDEBUG(D_PROBE, "disconnect complete");
1790 }
1791 EXPORT_SYMBOL(gspca_disconnect);
1792
1793 /* -- module insert / remove -- */
1794 static int __init gspca_init(void)
1795 {
1796         info("main v%s registered", version);
1797         return 0;
1798 }
1799 static void __exit gspca_exit(void)
1800 {
1801         info("main deregistered");
1802 }
1803
1804 module_init(gspca_init);
1805 module_exit(gspca_exit);
1806
1807 #ifdef CONFIG_VIDEO_ADV_DEBUG
1808 module_param_named(debug, gspca_debug, int, 0644);
1809 MODULE_PARM_DESC(debug,
1810                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
1811                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
1812                 " 0x0100: v4l2");
1813 #endif