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, 10, 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         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 227         gspca_dev->int_urb = urb;
 228         ret = usb_submit_urb(urb, GFP_KERNEL);
 229         if (ret < 0) {
 230                 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
 231                 goto error_submit;
 232         }
 233         return ret;
 234
 235 error_submit:
 236         usb_free_coherent(dev,
 237                           urb->transfer_buffer_length,
 238                           urb->transfer_buffer,
 239                           urb->transfer_dma);
 240 error_buffer:
 241         usb_free_urb(urb);
 242 error:
 243         return ret;
 244 }
 245
 246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 247 {
 248         struct usb_interface *intf;
 249         struct usb_host_interface *intf_desc;
 250         struct usb_endpoint_descriptor *ep;
 251         int i;
 252
 253         if (gspca_dev->sd_desc->int_pkt_scan)  {
 254                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 255                 intf_desc = intf->cur_altsetting;
 256                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 257                         ep = &intf_desc->endpoint[i].desc;
 258                         if (usb_endpoint_dir_in(ep) &&
 259                             usb_endpoint_xfer_int(ep)) {
 260
 261                                 alloc_and_submit_int_urb(gspca_dev, ep);
 262                                 break;
 263                         }
 264                 }
 265         }
 266 }
 267
 268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 269 {
 270         struct urb *urb;
 271
 272         urb = gspca_dev->int_urb;
 273         if (urb) {
 274                 gspca_dev->int_urb = NULL;
 275                 usb_kill_urb(urb);
 276                 usb_free_coherent(gspca_dev->dev,
 277                                   urb->transfer_buffer_length,
 278                                   urb->transfer_buffer,
 279                                   urb->transfer_dma);
 280                 usb_free_urb(urb);
 281         }
 282 }
 283 #else
 284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 285 {
 286 }
 287
 288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 289 {
 290 }
 291
 292 static inline int gspca_input_connect(struct gspca_dev *dev)
 293 {
 294         return 0;
 295 }
 296 #endif
 297
 298 /*
 299  * fill a video frame from an URB and resubmit
 300  */
 301 static void fill_frame(struct gspca_dev *gspca_dev,
 302                         struct urb *urb)
 303 {
 304         u8 *data;               /* address of data in the iso message */
 305         int i, len, st;
 306         cam_pkt_op pkt_scan;
 307
 308         if (urb->status != 0) {
 309                 if (urb->status == -ESHUTDOWN)
 310                         return;         /* disconnection */
 311 #ifdef CONFIG_PM
 312                 if (gspca_dev->frozen)
 313                         return;
 314 #endif
 315                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321
 322                 /* check the packet status and length */
 323                 len = urb->iso_frame_desc[i].actual_length;
 324                 if (len == 0) {
 325                         if (gspca_dev->empty_packet == 0)
 326                                 gspca_dev->empty_packet = 1;
 327                         continue;
 328                 }
 329                 st = urb->iso_frame_desc[i].status;
 330                 if (st) {
 331                         PDEBUG(D_ERR,
 332                                 "ISOC data error: [%d] len=%d, status=%d",
 333                                 i, len, st);
 334                         gspca_dev->last_packet_type = DISCARD_PACKET;
 335                         continue;
 336                 }
 337
 338                 /* let the packet be analyzed by the subdriver */
 339                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 340                         i, urb->iso_frame_desc[i].offset, len);
 341                 data = (u8 *) urb->transfer_buffer
 342                                         + urb->iso_frame_desc[i].offset;
 343                 pkt_scan(gspca_dev, data, len);
 344         }
 345
 346 resubmit:
 347         /* resubmit the URB */
 348         st = usb_submit_urb(urb, GFP_ATOMIC);
 349         if (st < 0)
 350                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 351 }
 352
 353 /*
 354  * ISOC message interrupt from the USB device
 355  *
 356  * Analyse each packet and call the subdriver for copy to the frame buffer.
 357  */
 358 static void isoc_irq(struct urb *urb)
 359 {
 360         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 361
 362         PDEBUG(D_PACK, "isoc irq");
 363         if (!gspca_dev->streaming)
 364                 return;
 365         fill_frame(gspca_dev, urb);
 366 }
 367
 368 /*
 369  * bulk message interrupt from the USB device
 370  */
 371 static void bulk_irq(struct urb *urb)
 372 {
 373         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 374         int st;
 375
 376         PDEBUG(D_PACK, "bulk irq");
 377         if (!gspca_dev->streaming)
 378                 return;
 379         switch (urb->status) {
 380         case 0:
 381                 break;
 382         case -ESHUTDOWN:
 383                 return;         /* disconnection */
 384         default:
 385 #ifdef CONFIG_PM
 386                 if (gspca_dev->frozen)
 387                         return;
 388 #endif
 389                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 390                 urb->status = 0;
 391                 goto resubmit;
 392         }
 393
 394         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 395         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 396                                 urb->transfer_buffer,
 397                                 urb->actual_length);
 398
 399 resubmit:
 400         /* resubmit the URB */
 401         if (gspca_dev->cam.bulk_nurbs != 0) {
 402                 st = usb_submit_urb(urb, GFP_ATOMIC);
 403                 if (st < 0)
 404                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 405         }
 406 }
 407
 408 /*
 409  * add data to the current frame
 410  *
 411  * This function is called by the subdrivers at interrupt level.
 412  *
 413  * To build a frame, these ones must add
 414  *      - one FIRST_PACKET
 415  *      - 0 or many INTER_PACKETs
 416  *      - one LAST_PACKET
 417  * DISCARD_PACKET invalidates the whole frame.
 418  * On LAST_PACKET, a new frame is returned.
 419  */
 420 void gspca_frame_add(struct gspca_dev *gspca_dev,
 421                         enum gspca_packet_type packet_type,
 422                         const u8 *data,
 423                         int len)
 424 {
 425         struct gspca_frame *frame;
 426         int i, j;
 427
 428         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 429
 430         if (packet_type == FIRST_PACKET) {
 431                 i = atomic_read(&gspca_dev->fr_i);
 432
 433                 /* if there are no queued buffer, discard the whole frame */
 434                 if (i == atomic_read(&gspca_dev->fr_q)) {
 435                         gspca_dev->last_packet_type = DISCARD_PACKET;
 436                         return;
 437                 }
 438                 j = gspca_dev->fr_queue[i];
 439                 frame = &gspca_dev->frame[j];
 440                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 441                 frame->v4l2_buf.sequence = ++gspca_dev->sequence;
 442                 gspca_dev->image = frame->data;
 443                 gspca_dev->image_len = 0;
 444         } else {
 445                 switch (gspca_dev->last_packet_type) {
 446                 case DISCARD_PACKET:
 447                         if (packet_type == LAST_PACKET)
 448                                 gspca_dev->last_packet_type = packet_type;
 449                         return;
 450                 case LAST_PACKET:
 451                         return;
 452                 }
 453         }
 454
 455         /* append the packet to the frame buffer */
 456         if (len > 0) {
 457                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 458                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 459                                 gspca_dev->image_len + len,
 460                                 gspca_dev->frsz);
 461                         packet_type = DISCARD_PACKET;
 462                 } else {
 463 /* !! image is NULL only when last pkt is LAST or DISCARD
 464                         if (gspca_dev->image == NULL) {
 465                                 err("gspca_frame_add() image == NULL");
 466                                 return;
 467                         }
 468  */
 469                         memcpy(gspca_dev->image + gspca_dev->image_len,
 470                                 data, len);
 471                         gspca_dev->image_len += len;
 472                 }
 473         }
 474         gspca_dev->last_packet_type = packet_type;
 475
 476         /* if last packet, invalidate packet concatenation until
 477          * next first packet, wake up the application and advance
 478          * in the queue */
 479         if (packet_type == LAST_PACKET) {
 480                 i = atomic_read(&gspca_dev->fr_i);
 481                 j = gspca_dev->fr_queue[i];
 482                 frame = &gspca_dev->frame[j];
 483                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 484                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 485                                          | V4L2_BUF_FLAG_DONE)
 486                                         & ~V4L2_BUF_FLAG_QUEUED;
 487                 i = (i + 1) % GSPCA_MAX_FRAMES;
 488                 atomic_set(&gspca_dev->fr_i, i);
 489                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 490                 PDEBUG(D_FRAM, "frame complete len:%d",
 491                         frame->v4l2_buf.bytesused);
 492                 gspca_dev->image = NULL;
 493                 gspca_dev->image_len = 0;
 494         }
 495 }
 496 EXPORT_SYMBOL(gspca_frame_add);
 497
 498 static int gspca_is_compressed(__u32 format)
 499 {
 500         switch (format) {
 501         case V4L2_PIX_FMT_MJPEG:
 502         case V4L2_PIX_FMT_JPEG:
 503         case V4L2_PIX_FMT_SPCA561:
 504         case V4L2_PIX_FMT_PAC207:
 505         case V4L2_PIX_FMT_MR97310A:
 506                 return 1;
 507         }
 508         return 0;
 509 }
 510
 511 static int frame_alloc(struct gspca_dev *gspca_dev,
 512                         unsigned int count)
 513 {
 514         struct gspca_frame *frame;
 515         unsigned int frsz;
 516         int i;
 517
 518         i = gspca_dev->curr_mode;
 519         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 520         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 521         frsz = PAGE_ALIGN(frsz);
 522         gspca_dev->frsz = frsz;
 523         if (count >= GSPCA_MAX_FRAMES)
 524                 count = GSPCA_MAX_FRAMES - 1;
 525         gspca_dev->frbuf = vmalloc_32(frsz * count);
 526         if (!gspca_dev->frbuf) {
 527                 err("frame alloc failed");
 528                 return -ENOMEM;
 529         }
 530         gspca_dev->nframes = count;
 531         for (i = 0; i < count; i++) {
 532                 frame = &gspca_dev->frame[i];
 533                 frame->v4l2_buf.index = i;
 534                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 535                 frame->v4l2_buf.flags = 0;
 536                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 537                 frame->v4l2_buf.length = frsz;
 538                 frame->v4l2_buf.memory = gspca_dev->memory;
 539                 frame->v4l2_buf.sequence = 0;
 540                 frame->data = gspca_dev->frbuf + i * frsz;
 541                 frame->v4l2_buf.m.offset = i * frsz;
 542         }
 543         atomic_set(&gspca_dev->fr_q, 0);
 544         atomic_set(&gspca_dev->fr_i, 0);
 545         gspca_dev->fr_o = 0;
 546         return 0;
 547 }
 548
 549 static void frame_free(struct gspca_dev *gspca_dev)
 550 {
 551         int i;
 552
 553         PDEBUG(D_STREAM, "frame free");
 554         if (gspca_dev->frbuf != NULL) {
 555                 vfree(gspca_dev->frbuf);
 556                 gspca_dev->frbuf = NULL;
 557                 for (i = 0; i < gspca_dev->nframes; i++)
 558                         gspca_dev->frame[i].data = NULL;
 559         }
 560         gspca_dev->nframes = 0;
 561 }
 562
 563 static void destroy_urbs(struct gspca_dev *gspca_dev)
 564 {
 565         struct urb *urb;
 566         unsigned int i;
 567
 568         PDEBUG(D_STREAM, "kill transfer");
 569         for (i = 0; i < MAX_NURBS; i++) {
 570                 urb = gspca_dev->urb[i];
 571                 if (urb == NULL)
 572                         break;
 573
 574                 gspca_dev->urb[i] = NULL;
 575                 usb_kill_urb(urb);
 576                 if (urb->transfer_buffer != NULL)
 577                         usb_free_coherent(gspca_dev->dev,
 578                                           urb->transfer_buffer_length,
 579                                           urb->transfer_buffer,
 580                                           urb->transfer_dma);
 581                 usb_free_urb(urb);
 582         }
 583 }
 584
 585 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 586 {
 587         int ret;
 588
 589         if (gspca_dev->alt == 0)
 590                 return 0;
 591         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 592         if (ret < 0)
 593                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 594         return ret;
 595 }
 596
 597 /* Note: both the queue and the usb locks should be held when calling this */
 598 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 599 {
 600         gspca_dev->streaming = 0;
 601         if (gspca_dev->present) {
 602                 if (gspca_dev->sd_desc->stopN)
 603                         gspca_dev->sd_desc->stopN(gspca_dev);
 604                 destroy_urbs(gspca_dev);
 605                 gspca_input_destroy_urb(gspca_dev);
 606                 gspca_set_alt0(gspca_dev);
 607                 gspca_input_create_urb(gspca_dev);
 608         }
 609
 610         /* always call stop0 to free the subdriver's resources */
 611         if (gspca_dev->sd_desc->stop0)
 612                 gspca_dev->sd_desc->stop0(gspca_dev);
 613         PDEBUG(D_STREAM, "stream off OK");
 614 }
 615
 616 /*
 617  * look for an input transfer endpoint in an alternate setting
 618  */
 619 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 620                                           int xfer)
 621 {
 622         struct usb_host_endpoint *ep;
 623         int i, attr;
 624
 625         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 626                 ep = &alt->endpoint[i];
 627                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 628                 if (attr == xfer
 629                     && ep->desc.wMaxPacketSize != 0)
 630                         return ep;
 631         }
 632         return NULL;
 633 }
 634
 635 /*
 636  * look for an input (isoc or bulk) endpoint
 637  *
 638  * The endpoint is defined by the subdriver.
 639  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 640  * This routine may be called many times when the bandwidth is too small
 641  * (the bandwidth is checked on urb submit).
 642  */
 643 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 644 {
 645         struct usb_interface *intf;
 646         struct usb_host_endpoint *ep;
 647         int xfer, i, ret;
 648
 649         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 650         ep = NULL;
 651         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 652                                    : USB_ENDPOINT_XFER_ISOC;
 653         i = gspca_dev->alt;                     /* previous alt setting */
 654         if (gspca_dev->cam.reverse_alts) {
 655                 if (gspca_dev->audio)
 656                         i++;
 657                 while (++i < gspca_dev->nbalt) {
 658                         ep = alt_xfer(&intf->altsetting[i], xfer);
 659                         if (ep)
 660                                 break;
 661                 }
 662         } else {
 663                 if (gspca_dev->audio)
 664                         i--;
 665                 while (--i >= 0) {
 666                         ep = alt_xfer(&intf->altsetting[i], xfer);
 667                         if (ep)
 668                                 break;
 669                 }
 670         }
 671         if (ep == NULL) {
 672                 err("no transfer endpoint found");
 673                 return NULL;
 674         }
 675         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 676                         i, ep->desc.bEndpointAddress);
 677         gspca_dev->alt = i;             /* memorize the current alt setting */
 678         if (gspca_dev->nbalt > 1) {
 679                 gspca_input_destroy_urb(gspca_dev);
 680                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 681                 if (ret < 0) {
 682                         err("set alt %d err %d", i, ret);
 683                         ep = NULL;
 684                 }
 685                 gspca_input_create_urb(gspca_dev);
 686         }
 687         return ep;
 688 }
 689
 690 /*
 691  * create the URBs for image transfer
 692  */
 693 static int create_urbs(struct gspca_dev *gspca_dev,
 694                         struct usb_host_endpoint *ep)
 695 {
 696         struct urb *urb;
 697         int n, nurbs, i, psize, npkt, bsize;
 698
 699         /* calculate the packet size and the number of packets */
 700         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 701
 702         if (!gspca_dev->cam.bulk) {             /* isoc */
 703
 704                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 705                 if (gspca_dev->pkt_size == 0)
 706                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 707                 else
 708                         psize = gspca_dev->pkt_size;
 709                 npkt = gspca_dev->cam.npkt;
 710                 if (npkt == 0)
 711                         npkt = 32;              /* default value */
 712                 bsize = psize * npkt;
 713                 PDEBUG(D_STREAM,
 714                         "isoc %d pkts size %d = bsize:%d",
 715                         npkt, psize, bsize);
 716                 nurbs = DEF_NURBS;
 717         } else {                                /* bulk */
 718                 npkt = 0;
 719                 bsize = gspca_dev->cam.bulk_size;
 720                 if (bsize == 0)
 721                         bsize = psize;
 722                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 723                 if (gspca_dev->cam.bulk_nurbs != 0)
 724                         nurbs = gspca_dev->cam.bulk_nurbs;
 725                 else
 726                         nurbs = 1;
 727         }
 728
 729         for (n = 0; n < nurbs; n++) {
 730                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 731                 if (!urb) {
 732                         err("usb_alloc_urb failed");
 733                         return -ENOMEM;
 734                 }
 735                 gspca_dev->urb[n] = urb;
 736                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 737                                                 bsize,
 738                                                 GFP_KERNEL,
 739                                                 &urb->transfer_dma);
 740
 741                 if (urb->transfer_buffer == NULL) {
 742                         err("usb_alloc_coherent failed");
 743                         return -ENOMEM;
 744                 }
 745                 urb->dev = gspca_dev->dev;
 746                 urb->context = gspca_dev;
 747                 urb->transfer_buffer_length = bsize;
 748                 if (npkt != 0) {                /* ISOC */
 749                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 750                                                     ep->desc.bEndpointAddress);
 751                         urb->transfer_flags = URB_ISO_ASAP
 752                                         | URB_NO_TRANSFER_DMA_MAP;
 753                         urb->interval = ep->desc.bInterval;
 754                         urb->complete = isoc_irq;
 755                         urb->number_of_packets = npkt;
 756                         for (i = 0; i < npkt; i++) {
 757                                 urb->iso_frame_desc[i].length = psize;
 758                                 urb->iso_frame_desc[i].offset = psize * i;
 759                         }
 760                 } else {                /* bulk */
 761                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 762                                                 ep->desc.bEndpointAddress),
 763                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 764                         urb->complete = bulk_irq;
 765                 }
 766         }
 767         return 0;
 768 }
 769
 770 /*
 771  * start the USB transfer
 772  */
 773 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 774 {
 775         struct usb_host_endpoint *ep;
 776         struct urb *urb;
 777         int n, ret;
 778
 779         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 780                 return -ERESTARTSYS;
 781
 782         if (!gspca_dev->present) {
 783                 ret = -ENODEV;
 784                 goto out;
 785         }
 786
 787         /* reset the streaming variables */
 788         gspca_dev->image = NULL;
 789         gspca_dev->image_len = 0;
 790         gspca_dev->last_packet_type = DISCARD_PACKET;
 791         gspca_dev->sequence = 0;
 792
 793         gspca_dev->usb_err = 0;
 794
 795         /* set the higher alternate setting and
 796          * loop until urb submit succeeds */
 797         if (gspca_dev->cam.reverse_alts)
 798                 gspca_dev->alt = 0;
 799         else
 800                 gspca_dev->alt = gspca_dev->nbalt;
 801
 802         if (gspca_dev->sd_desc->isoc_init) {
 803                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 804                 if (ret < 0)
 805                         goto out;
 806         }
 807         ep = get_ep(gspca_dev);
 808         if (ep == NULL) {
 809                 ret = -EIO;
 810                 goto out;
 811         }
 812         for (;;) {
 813                 if (!gspca_dev->cam.no_urb_create) {
 814                         PDEBUG(D_STREAM, "init transfer alt %d",
 815                                 gspca_dev->alt);
 816                         ret = create_urbs(gspca_dev, ep);
 817                         if (ret < 0) {
 818                                 destroy_urbs(gspca_dev);
 819                                 goto out;
 820                         }
 821                 }
 822
 823                 /* clear the bulk endpoint */
 824                 if (gspca_dev->cam.bulk)
 825                         usb_clear_halt(gspca_dev->dev,
 826                                         gspca_dev->urb[0]->pipe);
 827
 828                 /* start the cam */
 829                 ret = gspca_dev->sd_desc->start(gspca_dev);
 830                 if (ret < 0) {
 831                         destroy_urbs(gspca_dev);
 832                         goto out;
 833                 }
 834                 gspca_dev->streaming = 1;
 835
 836                 /* some bulk transfers are started by the subdriver */
 837                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 838                         break;
 839
 840                 /* submit the URBs */
 841                 for (n = 0; n < MAX_NURBS; n++) {
 842                         urb = gspca_dev->urb[n];
 843                         if (urb == NULL)
 844                                 break;
 845                         ret = usb_submit_urb(urb, GFP_KERNEL);
 846                         if (ret < 0)
 847                                 break;
 848                 }
 849                 if (ret >= 0)
 850                         break;
 851                 gspca_stream_off(gspca_dev);
 852                 if (ret != -ENOSPC) {
 853                         PDEBUG(D_ERR|D_STREAM,
 854                                 "usb_submit_urb alt %d err %d",
 855                                 gspca_dev->alt, ret);
 856                         goto out;
 857                 }
 858
 859                 /* the bandwidth is not wide enough
 860                  * negociate or try a lower alternate setting */
 861                 PDEBUG(D_ERR|D_STREAM,
 862                         "bandwidth not wide enough - trying again");
 863                 msleep(20);     /* wait for kill complete */
 864                 if (gspca_dev->sd_desc->isoc_nego) {
 865                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 866                         if (ret < 0)
 867                                 goto out;
 868                 } else {
 869                         ep = get_ep(gspca_dev);
 870                         if (ep == NULL) {
 871                                 ret = -EIO;
 872                                 goto out;
 873                         }
 874                 }
 875         }
 876 out:
 877         mutex_unlock(&gspca_dev->usb_lock);
 878         return ret;
 879 }
 880
 881 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 882 {
 883         int i;
 884
 885         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 886         gspca_dev->curr_mode = i;
 887         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 888         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 889         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 890 }
 891
 892 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 893                         int width, int height)
 894 {
 895         int i;
 896
 897         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 898                 if (width >= gspca_dev->cam.cam_mode[i].width
 899                     && height >= gspca_dev->cam.cam_mode[i].height)
 900                         break;
 901         }
 902         return i;
 903 }
 904
 905 /*
 906  * search a mode with the right pixel format
 907  */
 908 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 909                         int mode,
 910                         int pixfmt)
 911 {
 912         int modeU, modeD;
 913
 914         modeU = modeD = mode;
 915         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 916                 if (--modeD >= 0) {
 917                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 918                                                                 == pixfmt)
 919                                 return modeD;
 920                 }
 921                 if (++modeU < gspca_dev->cam.nmodes) {
 922                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 923                                                                 == pixfmt)
 924                                 return modeU;
 925                 }
 926         }
 927         return -EINVAL;
 928 }
 929
 930 #ifdef CONFIG_VIDEO_ADV_DEBUG
 931 static int vidioc_g_register(struct file *file, void *priv,
 932                         struct v4l2_dbg_register *reg)
 933 {
 934         int ret;
 935         struct gspca_dev *gspca_dev = priv;
 936
 937         if (!gspca_dev->sd_desc->get_chip_ident)
 938                 return -EINVAL;
 939
 940         if (!gspca_dev->sd_desc->get_register)
 941                 return -EINVAL;
 942
 943         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 944                 return -ERESTARTSYS;
 945         gspca_dev->usb_err = 0;
 946         if (gspca_dev->present)
 947                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 948         else
 949                 ret = -ENODEV;
 950         mutex_unlock(&gspca_dev->usb_lock);
 951
 952         return ret;
 953 }
 954
 955 static int vidioc_s_register(struct file *file, void *priv,
 956                         struct v4l2_dbg_register *reg)
 957 {
 958         int ret;
 959         struct gspca_dev *gspca_dev = priv;
 960
 961         if (!gspca_dev->sd_desc->get_chip_ident)
 962                 return -EINVAL;
 963
 964         if (!gspca_dev->sd_desc->set_register)
 965                 return -EINVAL;
 966
 967         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 968                 return -ERESTARTSYS;
 969         gspca_dev->usb_err = 0;
 970         if (gspca_dev->present)
 971                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 972         else
 973                 ret = -ENODEV;
 974         mutex_unlock(&gspca_dev->usb_lock);
 975
 976         return ret;
 977 }
 978 #endif
 979
 980 static int vidioc_g_chip_ident(struct file *file, void *priv,
 981                         struct v4l2_dbg_chip_ident *chip)
 982 {
 983         int ret;
 984         struct gspca_dev *gspca_dev = priv;
 985
 986         if (!gspca_dev->sd_desc->get_chip_ident)
 987                 return -EINVAL;
 988
 989         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 990                 return -ERESTARTSYS;
 991         gspca_dev->usb_err = 0;
 992         if (gspca_dev->present)
 993                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 994         else
 995                 ret = -ENODEV;
 996         mutex_unlock(&gspca_dev->usb_lock);
 997
 998         return ret;
 999 }
1000
1001 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1002                                 struct v4l2_fmtdesc *fmtdesc)
1003 {
1004         struct gspca_dev *gspca_dev = priv;
1005         int i, j, index;
1006         __u32 fmt_tb[8];
1007
1008         /* give an index to each format */
1009         index = 0;
1010         j = 0;
1011         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1012                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1013                 j = 0;
1014                 for (;;) {
1015                         if (fmt_tb[j] == fmt_tb[index])
1016                                 break;
1017                         j++;
1018                 }
1019                 if (j == index) {
1020                         if (fmtdesc->index == index)
1021                                 break;          /* new format */
1022                         index++;
1023                         if (index >= ARRAY_SIZE(fmt_tb))
1024                                 return -EINVAL;
1025                 }
1026         }
1027         if (i < 0)
1028                 return -EINVAL;         /* no more format */
1029
1030         fmtdesc->pixelformat = fmt_tb[index];
1031         if (gspca_is_compressed(fmt_tb[index]))
1032                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1033         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1034         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1035         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1036         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1037         fmtdesc->description[4] = '\0';
1038         return 0;
1039 }
1040
1041 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1042                             struct v4l2_format *fmt)
1043 {
1044         struct gspca_dev *gspca_dev = priv;
1045         int mode;
1046
1047         mode = gspca_dev->curr_mode;
1048         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1049                 sizeof fmt->fmt.pix);
1050         return 0;
1051 }
1052
1053 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1054                         struct v4l2_format *fmt)
1055 {
1056         int w, h, mode, mode2;
1057
1058         w = fmt->fmt.pix.width;
1059         h = fmt->fmt.pix.height;
1060
1061 #ifdef GSPCA_DEBUG
1062         if (gspca_debug & D_CONF)
1063                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1064 #endif
1065         /* search the closest mode for width and height */
1066         mode = wxh_to_mode(gspca_dev, w, h);
1067
1068         /* OK if right palette */
1069         if (gspca_dev->cam.cam_mode[mode].pixelformat
1070                                                 != fmt->fmt.pix.pixelformat) {
1071
1072                 /* else, search the closest mode with the same pixel format */
1073                 mode2 = gspca_get_mode(gspca_dev, mode,
1074                                         fmt->fmt.pix.pixelformat);
1075                 if (mode2 >= 0)
1076                         mode = mode2;
1077 /*              else
1078                         ;                * no chance, return this mode */
1079         }
1080         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1081                 sizeof fmt->fmt.pix);
1082         return mode;                    /* used when s_fmt */
1083 }
1084
1085 static int vidioc_try_fmt_vid_cap(struct file *file,
1086                               void *priv,
1087                               struct v4l2_format *fmt)
1088 {
1089         struct gspca_dev *gspca_dev = priv;
1090         int ret;
1091
1092         ret = try_fmt_vid_cap(gspca_dev, fmt);
1093         if (ret < 0)
1094                 return ret;
1095         return 0;
1096 }
1097
1098 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1099                             struct v4l2_format *fmt)
1100 {
1101         struct gspca_dev *gspca_dev = priv;
1102         int ret;
1103
1104         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1105                 return -ERESTARTSYS;
1106
1107         ret = try_fmt_vid_cap(gspca_dev, fmt);
1108         if (ret < 0)
1109                 goto out;
1110
1111         if (gspca_dev->nframes != 0
1112             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1113                 ret = -EINVAL;
1114                 goto out;
1115         }
1116
1117         if (ret == gspca_dev->curr_mode) {
1118                 ret = 0;
1119                 goto out;                       /* same mode */
1120         }
1121
1122         if (gspca_dev->streaming) {
1123                 ret = -EBUSY;
1124                 goto out;
1125         }
1126         gspca_dev->width = fmt->fmt.pix.width;
1127         gspca_dev->height = fmt->fmt.pix.height;
1128         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1129         gspca_dev->curr_mode = ret;
1130
1131         ret = 0;
1132 out:
1133         mutex_unlock(&gspca_dev->queue_lock);
1134         return ret;
1135 }
1136
1137 static int vidioc_enum_framesizes(struct file *file, void *priv,
1138                                   struct v4l2_frmsizeenum *fsize)
1139 {
1140         struct gspca_dev *gspca_dev = priv;
1141         int i;
1142         __u32 index = 0;
1143
1144         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1145                 if (fsize->pixel_format !=
1146                                 gspca_dev->cam.cam_mode[i].pixelformat)
1147                         continue;
1148
1149                 if (fsize->index == index) {
1150                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1151                         fsize->discrete.width =
1152                                 gspca_dev->cam.cam_mode[i].width;
1153                         fsize->discrete.height =
1154                                 gspca_dev->cam.cam_mode[i].height;
1155                         return 0;
1156                 }
1157                 index++;
1158         }
1159
1160         return -EINVAL;
1161 }
1162
1163 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1164                                       struct v4l2_frmivalenum *fival)
1165 {
1166         struct gspca_dev *gspca_dev = priv;
1167         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1168         __u32 i;
1169
1170         if (gspca_dev->cam.mode_framerates == NULL ||
1171                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1172                 return -EINVAL;
1173
1174         if (fival->pixel_format !=
1175                         gspca_dev->cam.cam_mode[mode].pixelformat)
1176                 return -EINVAL;
1177
1178         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1179                 if (fival->index == i) {
1180                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1181                         fival->discrete.numerator = 1;
1182                         fival->discrete.denominator =
1183                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1184                         return 0;
1185                 }
1186         }
1187
1188         return -EINVAL;
1189 }
1190
1191 static void gspca_release(struct video_device *vfd)
1192 {
1193         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1194
1195         PDEBUG(D_PROBE, "%s released",
1196                 video_device_node_name(&gspca_dev->vdev));
1197
1198         kfree(gspca_dev->usb_buf);
1199         kfree(gspca_dev);
1200 }
1201
1202 static int dev_open(struct file *file)
1203 {
1204         struct gspca_dev *gspca_dev;
1205         int ret;
1206
1207         PDEBUG(D_STREAM, "[%s] open", current->comm);
1208         gspca_dev = (struct gspca_dev *) video_devdata(file);
1209         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1210                 return -ERESTARTSYS;
1211         if (!gspca_dev->present) {
1212                 ret = -ENODEV;
1213                 goto out;
1214         }
1215
1216         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1217                 ret = -EBUSY;
1218                 goto out;
1219         }
1220
1221         /* protect the subdriver against rmmod */
1222         if (!try_module_get(gspca_dev->module)) {
1223                 ret = -ENODEV;
1224                 goto out;
1225         }
1226
1227         gspca_dev->users++;
1228
1229         file->private_data = gspca_dev;
1230 #ifdef GSPCA_DEBUG
1231         /* activate the v4l2 debug */
1232         if (gspca_debug & D_V4L2)
1233                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1234                                         | V4L2_DEBUG_IOCTL_ARG;
1235         else
1236                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1237                                         | V4L2_DEBUG_IOCTL_ARG);
1238 #endif
1239         ret = 0;
1240 out:
1241         mutex_unlock(&gspca_dev->queue_lock);
1242         if (ret != 0)
1243                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1244         else
1245                 PDEBUG(D_STREAM, "open done");
1246         return ret;
1247 }
1248
1249 static int dev_close(struct file *file)
1250 {
1251         struct gspca_dev *gspca_dev = file->private_data;
1252
1253         PDEBUG(D_STREAM, "[%s] close", current->comm);
1254         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1255                 return -ERESTARTSYS;
1256         gspca_dev->users--;
1257
1258         /* if the file did the capture, free the streaming resources */
1259         if (gspca_dev->capt_file == file) {
1260                 if (gspca_dev->streaming) {
1261                         mutex_lock(&gspca_dev->usb_lock);
1262                         gspca_dev->usb_err = 0;
1263                         gspca_stream_off(gspca_dev);
1264                         mutex_unlock(&gspca_dev->usb_lock);
1265                 }
1266                 frame_free(gspca_dev);
1267                 gspca_dev->capt_file = NULL;
1268                 gspca_dev->memory = GSPCA_MEMORY_NO;
1269         }
1270         file->private_data = NULL;
1271         module_put(gspca_dev->module);
1272         mutex_unlock(&gspca_dev->queue_lock);
1273
1274         PDEBUG(D_STREAM, "close done");
1275
1276         return 0;
1277 }
1278
1279 static int vidioc_querycap(struct file *file, void  *priv,
1280                            struct v4l2_capability *cap)
1281 {
1282         struct gspca_dev *gspca_dev = priv;
1283         int ret;
1284
1285         /* protect the access to the usb device */
1286         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1287                 return -ERESTARTSYS;
1288         if (!gspca_dev->present) {
1289                 ret = -ENODEV;
1290                 goto out;
1291         }
1292         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1293         if (gspca_dev->dev->product != NULL) {
1294                 strncpy(cap->card, gspca_dev->dev->product,
1295                         sizeof cap->card);
1296         } else {
1297                 snprintf(cap->card, sizeof cap->card,
1298                         "USB Camera (%04x:%04x)",
1299                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1300                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1301         }
1302         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1303         cap->version = DRIVER_VERSION_NUMBER;
1304         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1305                           | V4L2_CAP_STREAMING
1306                           | V4L2_CAP_READWRITE;
1307         ret = 0;
1308 out:
1309         mutex_unlock(&gspca_dev->usb_lock);
1310         return ret;
1311 }
1312
1313 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1314                                    int id)
1315 {
1316         const struct ctrl *ctrls;
1317         int i;
1318
1319         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1320              i < gspca_dev->sd_desc->nctrls;
1321              i++, ctrls++) {
1322                 if (gspca_dev->ctrl_dis & (1 << i))
1323                         continue;
1324                 if (id == ctrls->qctrl.id)
1325                         return ctrls;
1326         }
1327         return NULL;
1328 }
1329
1330 static int vidioc_queryctrl(struct file *file, void *priv,
1331                            struct v4l2_queryctrl *q_ctrl)
1332 {
1333         struct gspca_dev *gspca_dev = priv;
1334         const struct ctrl *ctrls;
1335         int i;
1336         u32 id;
1337
1338         ctrls = NULL;
1339         id = q_ctrl->id;
1340         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1341                 id &= V4L2_CTRL_ID_MASK;
1342                 id++;
1343                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1344                         if (gspca_dev->ctrl_dis & (1 << i))
1345                                 continue;
1346                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1347                                 continue;
1348                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1349                                             > ctrls->qctrl.id)
1350                                 continue;
1351                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1352                 }
1353                 if (ctrls == NULL)
1354                         return -EINVAL;
1355         } else {
1356                 ctrls = get_ctrl(gspca_dev, id);
1357                 if (ctrls == NULL)
1358                         return -EINVAL;
1359                 i = ctrls - gspca_dev->sd_desc->ctrls;
1360         }
1361         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1362         if (gspca_dev->ctrl_inac & (1 << i))
1363                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1364         return 0;
1365 }
1366
1367 static int vidioc_s_ctrl(struct file *file, void *priv,
1368                          struct v4l2_control *ctrl)
1369 {
1370         struct gspca_dev *gspca_dev = priv;
1371         const struct ctrl *ctrls;
1372         int ret;
1373
1374         ctrls = get_ctrl(gspca_dev, ctrl->id);
1375         if (ctrls == NULL)
1376                 return -EINVAL;
1377
1378         if (ctrl->value < ctrls->qctrl.minimum
1379             || ctrl->value > ctrls->qctrl.maximum)
1380                 return -ERANGE;
1381         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1382         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1383                 return -ERESTARTSYS;
1384         gspca_dev->usb_err = 0;
1385         if (gspca_dev->present)
1386                 ret = ctrls->set(gspca_dev, ctrl->value);
1387         else
1388                 ret = -ENODEV;
1389         mutex_unlock(&gspca_dev->usb_lock);
1390         return ret;
1391 }
1392
1393 static int vidioc_g_ctrl(struct file *file, void *priv,
1394                          struct v4l2_control *ctrl)
1395 {
1396         struct gspca_dev *gspca_dev = priv;
1397         const struct ctrl *ctrls;
1398         int ret;
1399
1400         ctrls = get_ctrl(gspca_dev, ctrl->id);
1401         if (ctrls == NULL)
1402                 return -EINVAL;
1403
1404         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1405                 return -ERESTARTSYS;
1406         gspca_dev->usb_err = 0;
1407         if (gspca_dev->present)
1408                 ret = ctrls->get(gspca_dev, &ctrl->value);
1409         else
1410                 ret = -ENODEV;
1411         mutex_unlock(&gspca_dev->usb_lock);
1412         return ret;
1413 }
1414
1415 static int vidioc_querymenu(struct file *file, void *priv,
1416                             struct v4l2_querymenu *qmenu)
1417 {
1418         struct gspca_dev *gspca_dev = priv;
1419
1420         if (!gspca_dev->sd_desc->querymenu)
1421                 return -EINVAL;
1422         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1423 }
1424
1425 static int vidioc_enum_input(struct file *file, void *priv,
1426                                 struct v4l2_input *input)
1427 {
1428         struct gspca_dev *gspca_dev = priv;
1429
1430         if (input->index != 0)
1431                 return -EINVAL;
1432         input->type = V4L2_INPUT_TYPE_CAMERA;
1433         input->status = gspca_dev->cam.input_flags;
1434         strncpy(input->name, gspca_dev->sd_desc->name,
1435                 sizeof input->name);
1436         return 0;
1437 }
1438
1439 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1440 {
1441         *i = 0;
1442         return 0;
1443 }
1444
1445 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1446 {
1447         if (i > 0)
1448                 return -EINVAL;
1449         return (0);
1450 }
1451
1452 static int vidioc_reqbufs(struct file *file, void *priv,
1453                           struct v4l2_requestbuffers *rb)
1454 {
1455         struct gspca_dev *gspca_dev = priv;
1456         int i, ret = 0, streaming;
1457
1458         i = rb->memory;                 /* (avoid compilation warning) */
1459         switch (i) {
1460         case GSPCA_MEMORY_READ:                 /* (internal call) */
1461         case V4L2_MEMORY_MMAP:
1462         case V4L2_MEMORY_USERPTR:
1463                 break;
1464         default:
1465                 return -EINVAL;
1466         }
1467         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1468                 return -ERESTARTSYS;
1469
1470         if (gspca_dev->memory != GSPCA_MEMORY_NO
1471             && gspca_dev->memory != rb->memory) {
1472                 ret = -EBUSY;
1473                 goto out;
1474         }
1475
1476         /* only one file may do the capture */
1477         if (gspca_dev->capt_file != NULL
1478             && gspca_dev->capt_file != file) {
1479                 ret = -EBUSY;
1480                 goto out;
1481         }
1482
1483         /* if allocated, the buffers must not be mapped */
1484         for (i = 0; i < gspca_dev->nframes; i++) {
1485                 if (gspca_dev->frame[i].vma_use_count) {
1486                         ret = -EBUSY;
1487                         goto out;
1488                 }
1489         }
1490
1491         /* stop streaming */
1492         streaming = gspca_dev->streaming;
1493         if (streaming) {
1494                 mutex_lock(&gspca_dev->usb_lock);
1495                 gspca_dev->usb_err = 0;
1496                 gspca_stream_off(gspca_dev);
1497                 mutex_unlock(&gspca_dev->usb_lock);
1498         }
1499
1500         /* free the previous allocated buffers, if any */
1501         if (gspca_dev->nframes != 0) {
1502                 frame_free(gspca_dev);
1503                 gspca_dev->capt_file = NULL;
1504         }
1505         if (rb->count == 0)                     /* unrequest */
1506                 goto out;
1507         gspca_dev->memory = rb->memory;
1508         ret = frame_alloc(gspca_dev, rb->count);
1509         if (ret == 0) {
1510                 rb->count = gspca_dev->nframes;
1511                 gspca_dev->capt_file = file;
1512                 if (streaming)
1513                         ret = gspca_init_transfer(gspca_dev);
1514         }
1515 out:
1516         mutex_unlock(&gspca_dev->queue_lock);
1517         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1518         return ret;
1519 }
1520
1521 static int vidioc_querybuf(struct file *file, void *priv,
1522                            struct v4l2_buffer *v4l2_buf)
1523 {
1524         struct gspca_dev *gspca_dev = priv;
1525         struct gspca_frame *frame;
1526
1527         if (v4l2_buf->index < 0
1528             || v4l2_buf->index >= gspca_dev->nframes)
1529                 return -EINVAL;
1530
1531         frame = &gspca_dev->frame[v4l2_buf->index];
1532         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1533         return 0;
1534 }
1535
1536 static int vidioc_streamon(struct file *file, void *priv,
1537                            enum v4l2_buf_type buf_type)
1538 {
1539         struct gspca_dev *gspca_dev = priv;
1540         int ret;
1541
1542         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1543                 return -EINVAL;
1544         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1545                 return -ERESTARTSYS;
1546
1547         /* check the capture file */
1548         if (gspca_dev->capt_file != file) {
1549                 ret = -EBUSY;
1550                 goto out;
1551         }
1552
1553         if (gspca_dev->nframes == 0
1554             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1555                 ret = -EINVAL;
1556                 goto out;
1557         }
1558         if (!gspca_dev->streaming) {
1559                 ret = gspca_init_transfer(gspca_dev);
1560                 if (ret < 0)
1561                         goto out;
1562         }
1563 #ifdef GSPCA_DEBUG
1564         if (gspca_debug & D_STREAM) {
1565                 PDEBUG_MODE("stream on OK",
1566                         gspca_dev->pixfmt,
1567                         gspca_dev->width,
1568                         gspca_dev->height);
1569         }
1570 #endif
1571         ret = 0;
1572 out:
1573         mutex_unlock(&gspca_dev->queue_lock);
1574         return ret;
1575 }
1576
1577 static int vidioc_streamoff(struct file *file, void *priv,
1578                                 enum v4l2_buf_type buf_type)
1579 {
1580         struct gspca_dev *gspca_dev = priv;
1581         int ret;
1582
1583         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1584                 return -EINVAL;
1585         if (!gspca_dev->streaming)
1586                 return 0;
1587         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1588                 return -ERESTARTSYS;
1589
1590         /* check the capture file */
1591         if (gspca_dev->capt_file != file) {
1592                 ret = -EBUSY;
1593                 goto out;
1594         }
1595
1596         /* stop streaming */
1597         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1598                 ret = -ERESTARTSYS;
1599                 goto out;
1600         }
1601         gspca_dev->usb_err = 0;
1602         gspca_stream_off(gspca_dev);
1603         mutex_unlock(&gspca_dev->usb_lock);
1604
1605         /* empty the transfer queues */
1606         atomic_set(&gspca_dev->fr_q, 0);
1607         atomic_set(&gspca_dev->fr_i, 0);
1608         gspca_dev->fr_o = 0;
1609         ret = 0;
1610 out:
1611         mutex_unlock(&gspca_dev->queue_lock);
1612         return ret;
1613 }
1614
1615 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1616                         struct v4l2_jpegcompression *jpegcomp)
1617 {
1618         struct gspca_dev *gspca_dev = priv;
1619         int ret;
1620
1621         if (!gspca_dev->sd_desc->get_jcomp)
1622                 return -EINVAL;
1623         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1624                 return -ERESTARTSYS;
1625         gspca_dev->usb_err = 0;
1626         if (gspca_dev->present)
1627                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1628         else
1629                 ret = -ENODEV;
1630         mutex_unlock(&gspca_dev->usb_lock);
1631         return ret;
1632 }
1633
1634 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1635                         struct v4l2_jpegcompression *jpegcomp)
1636 {
1637         struct gspca_dev *gspca_dev = priv;
1638         int ret;
1639
1640         if (!gspca_dev->sd_desc->set_jcomp)
1641                 return -EINVAL;
1642         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1643                 return -ERESTARTSYS;
1644         gspca_dev->usb_err = 0;
1645         if (gspca_dev->present)
1646                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1647         else
1648                 ret = -ENODEV;
1649         mutex_unlock(&gspca_dev->usb_lock);
1650         return ret;
1651 }
1652
1653 static int vidioc_g_parm(struct file *filp, void *priv,
1654                         struct v4l2_streamparm *parm)
1655 {
1656         struct gspca_dev *gspca_dev = priv;
1657
1658         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1659
1660         if (gspca_dev->sd_desc->get_streamparm) {
1661                 int ret;
1662
1663                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1664                         return -ERESTARTSYS;
1665                 gspca_dev->usb_err = 0;
1666                 if (gspca_dev->present)
1667                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1668                                                                  parm);
1669                 else
1670                         ret = -ENODEV;
1671                 mutex_unlock(&gspca_dev->usb_lock);
1672                 return ret;
1673         }
1674
1675         return 0;
1676 }
1677
1678 static int vidioc_s_parm(struct file *filp, void *priv,
1679                         struct v4l2_streamparm *parm)
1680 {
1681         struct gspca_dev *gspca_dev = priv;
1682         int n;
1683
1684         n = parm->parm.capture.readbuffers;
1685         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1686                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1687         else
1688                 gspca_dev->nbufread = n;
1689
1690         if (gspca_dev->sd_desc->set_streamparm) {
1691                 int ret;
1692
1693                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1694                         return -ERESTARTSYS;
1695                 gspca_dev->usb_err = 0;
1696                 if (gspca_dev->present)
1697                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1698                                                                  parm);
1699                 else
1700                         ret = -ENODEV;
1701                 mutex_unlock(&gspca_dev->usb_lock);
1702                 return ret;
1703         }
1704
1705         return 0;
1706 }
1707
1708 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1709 {
1710         struct gspca_dev *gspca_dev = file->private_data;
1711         struct gspca_frame *frame;
1712         struct page *page;
1713         unsigned long addr, start, size;
1714         int i, ret;
1715
1716         start = vma->vm_start;
1717         size = vma->vm_end - vma->vm_start;
1718         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1719
1720         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1721                 return -ERESTARTSYS;
1722         if (!gspca_dev->present) {
1723                 ret = -ENODEV;
1724                 goto out;
1725         }
1726         if (gspca_dev->capt_file != file) {
1727                 ret = -EINVAL;
1728                 goto out;
1729         }
1730
1731         frame = NULL;
1732         for (i = 0; i < gspca_dev->nframes; ++i) {
1733                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1734                         PDEBUG(D_STREAM, "mmap bad memory type");
1735                         break;
1736                 }
1737                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1738                                                 == vma->vm_pgoff) {
1739                         frame = &gspca_dev->frame[i];
1740                         break;
1741                 }
1742         }
1743         if (frame == NULL) {
1744                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1745                 ret = -EINVAL;
1746                 goto out;
1747         }
1748         if (size != frame->v4l2_buf.length) {
1749                 PDEBUG(D_STREAM, "mmap bad size");
1750                 ret = -EINVAL;
1751                 goto out;
1752         }
1753
1754         /*
1755          * - VM_IO marks the area as being a mmaped region for I/O to a
1756          *   device. It also prevents the region from being core dumped.
1757          */
1758         vma->vm_flags |= VM_IO;
1759
1760         addr = (unsigned long) frame->data;
1761         while (size > 0) {
1762                 page = vmalloc_to_page((void *) addr);
1763                 ret = vm_insert_page(vma, start, page);
1764                 if (ret < 0)
1765                         goto out;
1766                 start += PAGE_SIZE;
1767                 addr += PAGE_SIZE;
1768                 size -= PAGE_SIZE;
1769         }
1770
1771         vma->vm_ops = &gspca_vm_ops;
1772         vma->vm_private_data = frame;
1773         gspca_vm_open(vma);
1774         ret = 0;
1775 out:
1776         mutex_unlock(&gspca_dev->queue_lock);
1777         return ret;
1778 }
1779
1780 /*
1781  * wait for a video frame
1782  *
1783  * If a frame is ready, its index is returned.
1784  */
1785 static int frame_wait(struct gspca_dev *gspca_dev,
1786                         int nonblock_ing)
1787 {
1788         int i, ret;
1789
1790         /* check if a frame is ready */
1791         i = gspca_dev->fr_o;
1792         if (i == atomic_read(&gspca_dev->fr_i)) {
1793                 if (nonblock_ing)
1794                         return -EAGAIN;
1795
1796                 /* wait till a frame is ready */
1797                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1798                         i != atomic_read(&gspca_dev->fr_i) ||
1799                         !gspca_dev->streaming || !gspca_dev->present,
1800                         msecs_to_jiffies(3000));
1801                 if (ret < 0)
1802                         return ret;
1803                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1804                         return -EIO;
1805         }
1806
1807         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1808
1809         if (gspca_dev->sd_desc->dq_callback) {
1810                 mutex_lock(&gspca_dev->usb_lock);
1811                 gspca_dev->usb_err = 0;
1812                 if (gspca_dev->present)
1813                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1814                 mutex_unlock(&gspca_dev->usb_lock);
1815         }
1816         return gspca_dev->fr_queue[i];
1817 }
1818
1819 /*
1820  * dequeue a video buffer
1821  *
1822  * If nonblock_ing is false, block until a buffer is available.
1823  */
1824 static int vidioc_dqbuf(struct file *file, void *priv,
1825                         struct v4l2_buffer *v4l2_buf)
1826 {
1827         struct gspca_dev *gspca_dev = priv;
1828         struct gspca_frame *frame;
1829         int i, ret;
1830
1831         PDEBUG(D_FRAM, "dqbuf");
1832         if (v4l2_buf->memory != gspca_dev->memory)
1833                 return -EINVAL;
1834
1835         if (!gspca_dev->present)
1836                 return -ENODEV;
1837
1838         /* if not streaming, be sure the application will not loop forever */
1839         if (!(file->f_flags & O_NONBLOCK)
1840             && !gspca_dev->streaming && gspca_dev->users == 1)
1841                 return -EINVAL;
1842
1843         /* only the capturing file may dequeue */
1844         if (gspca_dev->capt_file != file)
1845                 return -EINVAL;
1846
1847         /* only one dequeue / read at a time */
1848         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1849                 return -ERESTARTSYS;
1850
1851         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1852         if (ret < 0)
1853                 goto out;
1854         i = ret;                                /* frame index */
1855         frame = &gspca_dev->frame[i];
1856         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1857                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1858                                  frame->data,
1859                                  frame->v4l2_buf.bytesused)) {
1860                         PDEBUG(D_ERR|D_STREAM,
1861                                 "dqbuf cp to user failed");
1862                         ret = -EFAULT;
1863                         goto out;
1864                 }
1865         }
1866         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1867         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1868         PDEBUG(D_FRAM, "dqbuf %d", i);
1869         ret = 0;
1870 out:
1871         mutex_unlock(&gspca_dev->read_lock);
1872         return ret;
1873 }
1874
1875 /*
1876  * queue a video buffer
1877  *
1878  * Attempting to queue a buffer that has already been
1879  * queued will return -EINVAL.
1880  */
1881 static int vidioc_qbuf(struct file *file, void *priv,
1882                         struct v4l2_buffer *v4l2_buf)
1883 {
1884         struct gspca_dev *gspca_dev = priv;
1885         struct gspca_frame *frame;
1886         int i, index, ret;
1887
1888         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1889
1890         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1891                 return -ERESTARTSYS;
1892
1893         index = v4l2_buf->index;
1894         if ((unsigned) index >= gspca_dev->nframes) {
1895                 PDEBUG(D_FRAM,
1896                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1897                 ret = -EINVAL;
1898                 goto out;
1899         }
1900         if (v4l2_buf->memory != gspca_dev->memory) {
1901                 PDEBUG(D_FRAM, "qbuf bad memory type");
1902                 ret = -EINVAL;
1903                 goto out;
1904         }
1905
1906         frame = &gspca_dev->frame[index];
1907         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1908                 PDEBUG(D_FRAM, "qbuf bad state");
1909                 ret = -EINVAL;
1910                 goto out;
1911         }
1912
1913         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1914
1915         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1916                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1917                 frame->v4l2_buf.length = v4l2_buf->length;
1918         }
1919
1920         /* put the buffer in the 'queued' queue */
1921         i = atomic_read(&gspca_dev->fr_q);
1922         gspca_dev->fr_queue[i] = index;
1923         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1924
1925         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1926         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1927         ret = 0;
1928 out:
1929         mutex_unlock(&gspca_dev->queue_lock);
1930         return ret;
1931 }
1932
1933 /*
1934  * allocate the resources for read()
1935  */
1936 static int read_alloc(struct gspca_dev *gspca_dev,
1937                         struct file *file)
1938 {
1939         struct v4l2_buffer v4l2_buf;
1940         int i, ret;
1941
1942         PDEBUG(D_STREAM, "read alloc");
1943         if (gspca_dev->nframes == 0) {
1944                 struct v4l2_requestbuffers rb;
1945
1946                 memset(&rb, 0, sizeof rb);
1947                 rb.count = gspca_dev->nbufread;
1948                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1949                 rb.memory = GSPCA_MEMORY_READ;
1950                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1951                 if (ret != 0) {
1952                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1953                         return ret;
1954                 }
1955                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1956                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1957                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1958                 for (i = 0; i < gspca_dev->nbufread; i++) {
1959                         v4l2_buf.index = i;
1960                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1961                         if (ret != 0) {
1962                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1963                                 return ret;
1964                         }
1965                 }
1966                 gspca_dev->memory = GSPCA_MEMORY_READ;
1967         }
1968
1969         /* start streaming */
1970         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1971         if (ret != 0)
1972                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1973         return ret;
1974 }
1975
1976 static unsigned int dev_poll(struct file *file, poll_table *wait)
1977 {
1978         struct gspca_dev *gspca_dev = file->private_data;
1979         int ret;
1980
1981         PDEBUG(D_FRAM, "poll");
1982
1983         poll_wait(file, &gspca_dev->wq, wait);
1984
1985         /* if reqbufs is not done, the user would use read() */
1986         if (gspca_dev->nframes == 0) {
1987                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
1988                         return POLLERR;         /* not the 1st time */
1989                 ret = read_alloc(gspca_dev, file);
1990                 if (ret != 0)
1991                         return POLLERR;
1992         }
1993
1994         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
1995                 return POLLERR;
1996
1997         /* check if an image has been received */
1998         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1999                 ret = POLLIN | POLLRDNORM;      /* yes */
2000         else
2001                 ret = 0;
2002         mutex_unlock(&gspca_dev->queue_lock);
2003         if (!gspca_dev->present)
2004                 return POLLHUP;
2005         return ret;
2006 }
2007
2008 static ssize_t dev_read(struct file *file, char __user *data,
2009                     size_t count, loff_t *ppos)
2010 {
2011         struct gspca_dev *gspca_dev = file->private_data;
2012         struct gspca_frame *frame;
2013         struct v4l2_buffer v4l2_buf;
2014         struct timeval timestamp;
2015         int n, ret, ret2;
2016
2017         PDEBUG(D_FRAM, "read (%zd)", count);
2018         if (!gspca_dev->present)
2019                 return -ENODEV;
2020         switch (gspca_dev->memory) {
2021         case GSPCA_MEMORY_NO:                   /* first time */
2022                 ret = read_alloc(gspca_dev, file);
2023                 if (ret != 0)
2024                         return ret;
2025                 break;
2026         case GSPCA_MEMORY_READ:
2027                 if (gspca_dev->capt_file == file)
2028                         break;
2029                 /* fall thru */
2030         default:
2031                 return -EINVAL;
2032         }
2033
2034         /* get a frame */
2035         timestamp = ktime_to_timeval(ktime_get());
2036         timestamp.tv_sec--;
2037         n = 2;
2038         for (;;) {
2039                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2040                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2041                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2042                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2043                 if (ret != 0) {
2044                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2045                         return ret;
2046                 }
2047
2048                 /* if the process slept for more than 1 second,
2049                  * get a newer frame */
2050                 frame = &gspca_dev->frame[v4l2_buf.index];
2051                 if (--n < 0)
2052                         break;                  /* avoid infinite loop */
2053                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2054                         break;
2055                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2056                 if (ret != 0) {
2057                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2058                         return ret;
2059                 }
2060         }
2061
2062         /* copy the frame */
2063         if (count > frame->v4l2_buf.bytesused)
2064                 count = frame->v4l2_buf.bytesused;
2065         ret = copy_to_user(data, frame->data, count);
2066         if (ret != 0) {
2067                 PDEBUG(D_ERR|D_STREAM,
2068                         "read cp to user lack %d / %zd", ret, count);
2069                 ret = -EFAULT;
2070                 goto out;
2071         }
2072         ret = count;
2073 out:
2074         /* in each case, requeue the buffer */
2075         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2076         if (ret2 != 0)
2077                 return ret2;
2078         return ret;
2079 }
2080
2081 static struct v4l2_file_operations dev_fops = {
2082         .owner = THIS_MODULE,
2083         .open = dev_open,
2084         .release = dev_close,
2085         .read = dev_read,
2086         .mmap = dev_mmap,
2087         .unlocked_ioctl = video_ioctl2,
2088         .poll   = dev_poll,
2089 };
2090
2091 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2092         .vidioc_querycap        = vidioc_querycap,
2093         .vidioc_dqbuf           = vidioc_dqbuf,
2094         .vidioc_qbuf            = vidioc_qbuf,
2095         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2096         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2097         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2098         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2099         .vidioc_streamon        = vidioc_streamon,
2100         .vidioc_queryctrl       = vidioc_queryctrl,
2101         .vidioc_g_ctrl          = vidioc_g_ctrl,
2102         .vidioc_s_ctrl          = vidioc_s_ctrl,
2103         .vidioc_querymenu       = vidioc_querymenu,
2104         .vidioc_enum_input      = vidioc_enum_input,
2105         .vidioc_g_input         = vidioc_g_input,
2106         .vidioc_s_input         = vidioc_s_input,
2107         .vidioc_reqbufs         = vidioc_reqbufs,
2108         .vidioc_querybuf        = vidioc_querybuf,
2109         .vidioc_streamoff       = vidioc_streamoff,
2110         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2111         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2112         .vidioc_g_parm          = vidioc_g_parm,
2113         .vidioc_s_parm          = vidioc_s_parm,
2114         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2115         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2116 #ifdef CONFIG_VIDEO_ADV_DEBUG
2117         .vidioc_g_register      = vidioc_g_register,
2118         .vidioc_s_register      = vidioc_s_register,
2119 #endif
2120         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2121 };
2122
2123 static struct video_device gspca_template = {
2124         .name = "gspca main driver",
2125         .fops = &dev_fops,
2126         .ioctl_ops = &dev_ioctl_ops,
2127         .release = gspca_release,
2128 };
2129
2130 /*
2131  * probe and create a new gspca device
2132  *
2133  * This function must be called by the sub-driver when it is
2134  * called for probing a new device.
2135  */
2136 int gspca_dev_probe2(struct usb_interface *intf,
2137                 const struct usb_device_id *id,
2138                 const struct sd_desc *sd_desc,
2139                 int dev_size,
2140                 struct module *module)
2141 {
2142         struct gspca_dev *gspca_dev;
2143         struct usb_device *dev = interface_to_usbdev(intf);
2144         int ret;
2145
2146         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2147
2148         /* create the device */
2149         if (dev_size < sizeof *gspca_dev)
2150                 dev_size = sizeof *gspca_dev;
2151         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2152         if (!gspca_dev) {
2153                 err("couldn't kzalloc gspca struct");
2154                 return -ENOMEM;
2155         }
2156         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2157         if (!gspca_dev->usb_buf) {
2158                 err("out of memory");
2159                 ret = -ENOMEM;
2160                 goto out;
2161         }
2162         gspca_dev->dev = dev;
2163         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2164         gspca_dev->nbalt = intf->num_altsetting;
2165
2166         /* check if any audio device */
2167         if (dev->config->desc.bNumInterfaces != 1) {
2168                 int i;
2169                 struct usb_interface *intf2;
2170
2171                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2172                         intf2 = dev->config->interface[i];
2173                         if (intf2 != NULL
2174                          && intf2->altsetting != NULL
2175                          && intf2->altsetting->desc.bInterfaceClass ==
2176                                          USB_CLASS_AUDIO) {
2177                                 gspca_dev->audio = 1;
2178                                 break;
2179                         }
2180                 }
2181         }
2182
2183         gspca_dev->sd_desc = sd_desc;
2184         gspca_dev->nbufread = 2;
2185         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2186
2187         /* configure the subdriver and initialize the USB device */
2188         ret = sd_desc->config(gspca_dev, id);
2189         if (ret < 0)
2190                 goto out;
2191         ret = sd_desc->init(gspca_dev);
2192         if (ret < 0)
2193                 goto out;
2194         gspca_set_default_mode(gspca_dev);
2195
2196         ret = gspca_input_connect(gspca_dev);
2197         if (ret)
2198                 goto out;
2199
2200         mutex_init(&gspca_dev->usb_lock);
2201         mutex_init(&gspca_dev->read_lock);
2202         mutex_init(&gspca_dev->queue_lock);
2203         init_waitqueue_head(&gspca_dev->wq);
2204
2205         /* init video stuff */
2206         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2207         gspca_dev->vdev.parent = &intf->dev;
2208         gspca_dev->module = module;
2209         gspca_dev->present = 1;
2210         ret = video_register_device(&gspca_dev->vdev,
2211                                   VFL_TYPE_GRABBER,
2212                                   -1);
2213         if (ret < 0) {
2214                 err("video_register_device err %d", ret);
2215                 goto out;
2216         }
2217
2218         usb_set_intfdata(intf, gspca_dev);
2219         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2220
2221         gspca_input_create_urb(gspca_dev);
2222
2223         return 0;
2224 out:
2225 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2226         if (gspca_dev->input_dev)
2227                 input_unregister_device(gspca_dev->input_dev);
2228 #endif
2229         kfree(gspca_dev->usb_buf);
2230         kfree(gspca_dev);
2231         return ret;
2232 }
2233 EXPORT_SYMBOL(gspca_dev_probe2);
2234
2235 /* same function as the previous one, but check the interface */
2236 int gspca_dev_probe(struct usb_interface *intf,
2237                 const struct usb_device_id *id,
2238                 const struct sd_desc *sd_desc,
2239                 int dev_size,
2240                 struct module *module)
2241 {
2242         struct usb_device *dev = interface_to_usbdev(intf);
2243
2244         /* we don't handle multi-config cameras */
2245         if (dev->descriptor.bNumConfigurations != 1) {
2246                 PDEBUG(D_ERR, "%04x:%04x too many config",
2247                                 id->idVendor, id->idProduct);
2248                 return -ENODEV;
2249         }
2250
2251         /* the USB video interface must be the first one */
2252         if (dev->config->desc.bNumInterfaces != 1
2253          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2254                 return -ENODEV;
2255
2256         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2257 }
2258 EXPORT_SYMBOL(gspca_dev_probe);
2259
2260 /*
2261  * USB disconnection
2262  *
2263  * This function must be called by the sub-driver
2264  * when the device disconnects, after the specific resources are freed.
2265  */
2266 void gspca_disconnect(struct usb_interface *intf)
2267 {
2268         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2269 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2270         struct input_dev *input_dev;
2271 #endif
2272
2273         PDEBUG(D_PROBE, "%s disconnect",
2274                 video_device_node_name(&gspca_dev->vdev));
2275         mutex_lock(&gspca_dev->usb_lock);
2276         gspca_dev->present = 0;
2277
2278         if (gspca_dev->streaming) {
2279                 destroy_urbs(gspca_dev);
2280                 wake_up_interruptible(&gspca_dev->wq);
2281         }
2282
2283 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2284         gspca_input_destroy_urb(gspca_dev);
2285         input_dev = gspca_dev->input_dev;
2286         if (input_dev) {
2287                 gspca_dev->input_dev = NULL;
2288                 input_unregister_device(input_dev);
2289         }
2290 #endif
2291
2292         /* the device is freed at exit of this function */
2293         gspca_dev->dev = NULL;
2294         mutex_unlock(&gspca_dev->usb_lock);
2295
2296         usb_set_intfdata(intf, NULL);
2297
2298         /* release the device */
2299         /* (this will call gspca_release() immediatly or on last close) */
2300         video_unregister_device(&gspca_dev->vdev);
2301
2302 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2303 }
2304 EXPORT_SYMBOL(gspca_disconnect);
2305
2306 #ifdef CONFIG_PM
2307 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2308 {
2309         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2310
2311         if (!gspca_dev->streaming)
2312                 return 0;
2313         gspca_dev->frozen = 1;          /* avoid urb error messages */
2314         if (gspca_dev->sd_desc->stopN)
2315                 gspca_dev->sd_desc->stopN(gspca_dev);
2316         destroy_urbs(gspca_dev);
2317         gspca_input_destroy_urb(gspca_dev);
2318         gspca_set_alt0(gspca_dev);
2319         if (gspca_dev->sd_desc->stop0)
2320                 gspca_dev->sd_desc->stop0(gspca_dev);
2321         return 0;
2322 }
2323 EXPORT_SYMBOL(gspca_suspend);
2324
2325 int gspca_resume(struct usb_interface *intf)
2326 {
2327         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2328
2329         gspca_dev->frozen = 0;
2330         gspca_dev->sd_desc->init(gspca_dev);
2331         gspca_input_create_urb(gspca_dev);
2332         if (gspca_dev->streaming)
2333                 return gspca_init_transfer(gspca_dev);
2334         return 0;
2335 }
2336 EXPORT_SYMBOL(gspca_resume);
2337 #endif
2338 /* -- cam driver utility functions -- */
2339
2340 /* auto gain and exposure algorithm based on the knee algorithm described here:
2341    http://ytse.tricolour.net/docs/LowLightOptimization.html
2342
2343    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2344    where changed. */
2345 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2346         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2347 {
2348         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2349         const struct ctrl *gain_ctrl = NULL;
2350         const struct ctrl *exposure_ctrl = NULL;
2351         const struct ctrl *autogain_ctrl = NULL;
2352         int retval = 0;
2353
2354         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2355                 if (gspca_dev->ctrl_dis & (1 << i))
2356                         continue;
2357                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2358                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2359                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2360                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2361                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2362                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2363         }
2364         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2365                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2366                         "on cam without (auto)gain/exposure");
2367                 return 0;
2368         }
2369
2370         if (gain_ctrl->get(gspca_dev, &gain) ||
2371                         exposure_ctrl->get(gspca_dev, &exposure) ||
2372                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2373                 return 0;
2374
2375         orig_gain = gain;
2376         orig_exposure = exposure;
2377
2378         /* If we are of a multiple of deadzone, do multiple steps to reach the
2379            desired lumination fast (with the risc of a slight overshoot) */
2380         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2381
2382         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2383                 avg_lum, desired_avg_lum, steps);
2384
2385         for (i = 0; i < steps; i++) {
2386                 if (avg_lum > desired_avg_lum) {
2387                         if (gain > gain_knee)
2388                                 gain--;
2389                         else if (exposure > exposure_knee)
2390                                 exposure--;
2391                         else if (gain > gain_ctrl->qctrl.default_value)
2392                                 gain--;
2393                         else if (exposure > exposure_ctrl->qctrl.minimum)
2394                                 exposure--;
2395                         else if (gain > gain_ctrl->qctrl.minimum)
2396                                 gain--;
2397                         else
2398                                 break;
2399                 } else {
2400                         if (gain < gain_ctrl->qctrl.default_value)
2401                                 gain++;
2402                         else if (exposure < exposure_knee)
2403                                 exposure++;
2404                         else if (gain < gain_knee)
2405                                 gain++;
2406                         else if (exposure < exposure_ctrl->qctrl.maximum)
2407                                 exposure++;
2408                         else if (gain < gain_ctrl->qctrl.maximum)
2409                                 gain++;
2410                         else
2411                                 break;
2412                 }
2413         }
2414
2415         if (gain != orig_gain) {
2416                 gain_ctrl->set(gspca_dev, gain);
2417                 retval = 1;
2418         }
2419         if (exposure != orig_exposure) {
2420                 exposure_ctrl->set(gspca_dev, exposure);
2421                 retval = 1;
2422         }
2423
2424         return retval;
2425 }
2426 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2427
2428 /* -- module insert / remove -- */
2429 static int __init gspca_init(void)
2430 {
2431         info("main v%d.%d.%d registered",
2432                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2433                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2434                 DRIVER_VERSION_NUMBER & 0xff);
2435         return 0;
2436 }
2437 static void __exit gspca_exit(void)
2438 {
2439         info("main deregistered");
2440 }
2441
2442 module_init(gspca_init);
2443 module_exit(gspca_exit);
2444
2445 #ifdef GSPCA_DEBUG
2446 module_param_named(debug, gspca_debug, int, 0644);
2447 MODULE_PARM_DESC(debug,
2448                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2449                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2450                 " 0x0100: v4l2");
2451 #endif