Pileus Git - ~andy/linux/blob - drivers/media/usb/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #define GSPCA_VERSION   "2.14.0"
  27
  28 #include <linux/init.h>
  29 #include <linux/fs.h>
  30 #include <linux/vmalloc.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/string.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/io.h>
  37 #include <asm/page.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/ktime.h>
  40 #include <media/v4l2-ioctl.h>
  41 #include <media/v4l2-ctrls.h>
  42 #include <media/v4l2-fh.h>
  43 #include <media/v4l2-event.h>
  44
  45 #include "gspca.h"
  46
  47 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  48 #include <linux/input.h>
  49 #include <linux/usb/input.h>
  50 #endif
  51
  52 /* global values */
  53 #define DEF_NURBS 3             /* default number of URBs */
  54 #if DEF_NURBS > MAX_NURBS
  55 #error "DEF_NURBS too big"
  56 #endif
  57
  58 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  59 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  60 MODULE_LICENSE("GPL");
  61 MODULE_VERSION(GSPCA_VERSION);
  62
  63 #ifdef GSPCA_DEBUG
  64 int gspca_debug = D_ERR | D_PROBE;
  65 EXPORT_SYMBOL(gspca_debug);
  66
  67 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  68 {
  69         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  70                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  71                         txt,
  72                         pixfmt & 0xff,
  73                         (pixfmt >> 8) & 0xff,
  74                         (pixfmt >> 16) & 0xff,
  75                         pixfmt >> 24,
  76                         w, h);
  77         } else {
  78                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  79                         txt,
  80                         pixfmt,
  81                         w, h);
  82         }
  83 }
  84 #else
  85 #define PDEBUG_MODE(txt, pixfmt, w, h)
  86 #endif
  87
  88 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  89 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  90 #define GSPCA_MEMORY_READ 7
  91
  92 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  93
  94 /*
  95  * VMA operations.
  96  */
  97 static void gspca_vm_open(struct vm_area_struct *vma)
  98 {
  99         struct gspca_frame *frame = vma->vm_private_data;
 100
 101         frame->vma_use_count++;
 102         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 103 }
 104
 105 static void gspca_vm_close(struct vm_area_struct *vma)
 106 {
 107         struct gspca_frame *frame = vma->vm_private_data;
 108
 109         if (--frame->vma_use_count <= 0)
 110                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 111 }
 112
 113 static const struct vm_operations_struct gspca_vm_ops = {
 114         .open           = gspca_vm_open,
 115         .close          = gspca_vm_close,
 116 };
 117
 118 /*
 119  * Input and interrupt endpoint handling functions
 120  */
 121 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 122 static void int_irq(struct urb *urb)
 123 {
 124         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 125         int ret;
 126
 127         ret = urb->status;
 128         switch (ret) {
 129         case 0:
 130                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 131                     urb->transfer_buffer, urb->actual_length) < 0) {
 132                         PDEBUG(D_ERR, "Unknown packet received");
 133                 }
 134                 break;
 135
 136         case -ENOENT:
 137         case -ECONNRESET:
 138         case -ENODEV:
 139         case -ESHUTDOWN:
 140                 /* Stop is requested either by software or hardware is gone,
 141                  * keep the ret value non-zero and don't resubmit later.
 142                  */
 143                 break;
 144
 145         default:
 146                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 147                 urb->status = 0;
 148                 ret = 0;
 149         }
 150
 151         if (ret == 0) {
 152                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 153                 if (ret < 0)
 154                         pr_err("Resubmit URB failed with error %i\n", ret);
 155         }
 156 }
 157
 158 static int gspca_input_connect(struct gspca_dev *dev)
 159 {
 160         struct input_dev *input_dev;
 161         int err = 0;
 162
 163         dev->input_dev = NULL;
 164         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 165                 input_dev = input_allocate_device();
 166                 if (!input_dev)
 167                         return -ENOMEM;
 168
 169                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 170                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 171
 172                 input_dev->name = dev->sd_desc->name;
 173                 input_dev->phys = dev->phys;
 174
 175                 usb_to_input_id(dev->dev, &input_dev->id);
 176
 177                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 178                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 179                 input_dev->dev.parent = &dev->dev->dev;
 180
 181                 err = input_register_device(input_dev);
 182                 if (err) {
 183                         pr_err("Input device registration failed with error %i\n",
 184                                err);
 185                         input_dev->dev.parent = NULL;
 186                         input_free_device(input_dev);
 187                 } else {
 188                         dev->input_dev = input_dev;
 189                 }
 190         }
 191
 192         return err;
 193 }
 194
 195 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 196                           struct usb_endpoint_descriptor *ep)
 197 {
 198         unsigned int buffer_len;
 199         int interval;
 200         struct urb *urb;
 201         struct usb_device *dev;
 202         void *buffer = NULL;
 203         int ret = -EINVAL;
 204
 205         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 206         interval = ep->bInterval;
 207         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 208                 "buffer_len=%u, interval=%u",
 209                 ep->bEndpointAddress, buffer_len, interval);
 210
 211         dev = gspca_dev->dev;
 212
 213         urb = usb_alloc_urb(0, GFP_KERNEL);
 214         if (!urb) {
 215                 ret = -ENOMEM;
 216                 goto error;
 217         }
 218
 219         buffer = usb_alloc_coherent(dev, buffer_len,
 220                                 GFP_KERNEL, &urb->transfer_dma);
 221         if (!buffer) {
 222                 ret = -ENOMEM;
 223                 goto error_buffer;
 224         }
 225         usb_fill_int_urb(urb, dev,
 226                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 227                 buffer, buffer_len,
 228                 int_irq, (void *)gspca_dev, interval);
 229         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 230         ret = usb_submit_urb(urb, GFP_KERNEL);
 231         if (ret < 0) {
 232                 PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
 233                 goto error_submit;
 234         }
 235         gspca_dev->int_urb = urb;
 236         return ret;
 237
 238 error_submit:
 239         usb_free_coherent(dev,
 240                           urb->transfer_buffer_length,
 241                           urb->transfer_buffer,
 242                           urb->transfer_dma);
 243 error_buffer:
 244         usb_free_urb(urb);
 245 error:
 246         return ret;
 247 }
 248
 249 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 250 {
 251         struct usb_interface *intf;
 252         struct usb_host_interface *intf_desc;
 253         struct usb_endpoint_descriptor *ep;
 254         int i;
 255
 256         if (gspca_dev->sd_desc->int_pkt_scan)  {
 257                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 258                 intf_desc = intf->cur_altsetting;
 259                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 260                         ep = &intf_desc->endpoint[i].desc;
 261                         if (usb_endpoint_dir_in(ep) &&
 262                             usb_endpoint_xfer_int(ep)) {
 263
 264                                 alloc_and_submit_int_urb(gspca_dev, ep);
 265                                 break;
 266                         }
 267                 }
 268         }
 269 }
 270
 271 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 272 {
 273         struct urb *urb;
 274
 275         urb = gspca_dev->int_urb;
 276         if (urb) {
 277                 gspca_dev->int_urb = NULL;
 278                 usb_kill_urb(urb);
 279                 usb_free_coherent(gspca_dev->dev,
 280                                   urb->transfer_buffer_length,
 281                                   urb->transfer_buffer,
 282                                   urb->transfer_dma);
 283                 usb_free_urb(urb);
 284         }
 285 }
 286 #else
 287 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 288 {
 289 }
 290
 291 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 292 {
 293 }
 294
 295 static inline int gspca_input_connect(struct gspca_dev *dev)
 296 {
 297         return 0;
 298 }
 299 #endif
 300
 301 /*
 302  * fill a video frame from an URB and resubmit
 303  */
 304 static void fill_frame(struct gspca_dev *gspca_dev,
 305                         struct urb *urb)
 306 {
 307         u8 *data;               /* address of data in the iso message */
 308         int i, len, st;
 309         cam_pkt_op pkt_scan;
 310
 311         if (urb->status != 0) {
 312                 if (urb->status == -ESHUTDOWN)
 313                         return;         /* disconnection */
 314 #ifdef CONFIG_PM
 315                 if (gspca_dev->frozen)
 316                         return;
 317 #endif
 318                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 319                 urb->status = 0;
 320                 goto resubmit;
 321         }
 322         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 323         for (i = 0; i < urb->number_of_packets; i++) {
 324                 len = urb->iso_frame_desc[i].actual_length;
 325
 326                 /* check the packet status and length */
 327                 st = urb->iso_frame_desc[i].status;
 328                 if (st) {
 329                         pr_err("ISOC data error: [%d] len=%d, status=%d\n",
 330                                i, len, st);
 331                         gspca_dev->last_packet_type = DISCARD_PACKET;
 332                         continue;
 333                 }
 334                 if (len == 0) {
 335                         if (gspca_dev->empty_packet == 0)
 336                                 gspca_dev->empty_packet = 1;
 337                         continue;
 338                 }
 339
 340                 /* let the packet be analyzed by the subdriver */
 341                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 342                         i, urb->iso_frame_desc[i].offset, len);
 343                 data = (u8 *) urb->transfer_buffer
 344                                         + urb->iso_frame_desc[i].offset;
 345                 pkt_scan(gspca_dev, data, len);
 346         }
 347
 348 resubmit:
 349         /* resubmit the URB */
 350         st = usb_submit_urb(urb, GFP_ATOMIC);
 351         if (st < 0)
 352                 pr_err("usb_submit_urb() ret %d\n", st);
 353 }
 354
 355 /*
 356  * ISOC message interrupt from the USB device
 357  *
 358  * Analyse each packet and call the subdriver for copy to the frame buffer.
 359  */
 360 static void isoc_irq(struct urb *urb)
 361 {
 362         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 363
 364         PDEBUG(D_PACK, "isoc irq");
 365         if (!gspca_dev->streaming)
 366                 return;
 367         fill_frame(gspca_dev, urb);
 368 }
 369
 370 /*
 371  * bulk message interrupt from the USB device
 372  */
 373 static void bulk_irq(struct urb *urb)
 374 {
 375         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 376         int st;
 377
 378         PDEBUG(D_PACK, "bulk irq");
 379         if (!gspca_dev->streaming)
 380                 return;
 381         switch (urb->status) {
 382         case 0:
 383                 break;
 384         case -ESHUTDOWN:
 385                 return;         /* disconnection */
 386         default:
 387 #ifdef CONFIG_PM
 388                 if (gspca_dev->frozen)
 389                         return;
 390 #endif
 391                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 392                 urb->status = 0;
 393                 goto resubmit;
 394         }
 395
 396         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 397         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 398                                 urb->transfer_buffer,
 399                                 urb->actual_length);
 400
 401 resubmit:
 402         /* resubmit the URB */
 403         if (gspca_dev->cam.bulk_nurbs != 0) {
 404                 st = usb_submit_urb(urb, GFP_ATOMIC);
 405                 if (st < 0)
 406                         pr_err("usb_submit_urb() ret %d\n", st);
 407         }
 408 }
 409
 410 /*
 411  * add data to the current frame
 412  *
 413  * This function is called by the subdrivers at interrupt level.
 414  *
 415  * To build a frame, these ones must add
 416  *      - one FIRST_PACKET
 417  *      - 0 or many INTER_PACKETs
 418  *      - one LAST_PACKET
 419  * DISCARD_PACKET invalidates the whole frame.
 420  */
 421 void gspca_frame_add(struct gspca_dev *gspca_dev,
 422                         enum gspca_packet_type packet_type,
 423                         const u8 *data,
 424                         int len)
 425 {
 426         struct gspca_frame *frame;
 427         int i, j;
 428
 429         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 430
 431         if (packet_type == FIRST_PACKET) {
 432                 i = atomic_read(&gspca_dev->fr_i);
 433
 434                 /* if there are no queued buffer, discard the whole frame */
 435                 if (i == atomic_read(&gspca_dev->fr_q)) {
 436                         gspca_dev->last_packet_type = DISCARD_PACKET;
 437                         gspca_dev->sequence++;
 438                         return;
 439                 }
 440                 j = gspca_dev->fr_queue[i];
 441                 frame = &gspca_dev->frame[j];
 442                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 443                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 444                 gspca_dev->image = frame->data;
 445                 gspca_dev->image_len = 0;
 446         } else {
 447                 switch (gspca_dev->last_packet_type) {
 448                 case DISCARD_PACKET:
 449                         if (packet_type == LAST_PACKET) {
 450                                 gspca_dev->last_packet_type = packet_type;
 451                                 gspca_dev->image = NULL;
 452                                 gspca_dev->image_len = 0;
 453                         }
 454                         return;
 455                 case LAST_PACKET:
 456                         return;
 457                 }
 458         }
 459
 460         /* append the packet to the frame buffer */
 461         if (len > 0) {
 462                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 463                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 464                                 gspca_dev->image_len + len,
 465                                 gspca_dev->frsz);
 466                         packet_type = DISCARD_PACKET;
 467                 } else {
 468 /* !! image is NULL only when last pkt is LAST or DISCARD
 469                         if (gspca_dev->image == NULL) {
 470                                 pr_err("gspca_frame_add() image == NULL\n");
 471                                 return;
 472                         }
 473  */
 474                         memcpy(gspca_dev->image + gspca_dev->image_len,
 475                                 data, len);
 476                         gspca_dev->image_len += len;
 477                 }
 478         }
 479         gspca_dev->last_packet_type = packet_type;
 480
 481         /* if last packet, invalidate packet concatenation until
 482          * next first packet, wake up the application and advance
 483          * in the queue */
 484         if (packet_type == LAST_PACKET) {
 485                 i = atomic_read(&gspca_dev->fr_i);
 486                 j = gspca_dev->fr_queue[i];
 487                 frame = &gspca_dev->frame[j];
 488                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 489                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 490                                          | V4L2_BUF_FLAG_DONE)
 491                                         & ~V4L2_BUF_FLAG_QUEUED;
 492                 i = (i + 1) % GSPCA_MAX_FRAMES;
 493                 atomic_set(&gspca_dev->fr_i, i);
 494                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 495                 PDEBUG(D_FRAM, "frame complete len:%d",
 496                         frame->v4l2_buf.bytesused);
 497                 gspca_dev->image = NULL;
 498                 gspca_dev->image_len = 0;
 499         }
 500 }
 501 EXPORT_SYMBOL(gspca_frame_add);
 502
 503 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 504                         enum v4l2_memory memory, unsigned int count)
 505 {
 506         struct gspca_frame *frame;
 507         unsigned int frsz;
 508         int i;
 509
 510         i = gspca_dev->curr_mode;
 511         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 512         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 513         frsz = PAGE_ALIGN(frsz);
 514         if (count >= GSPCA_MAX_FRAMES)
 515                 count = GSPCA_MAX_FRAMES - 1;
 516         gspca_dev->frbuf = vmalloc_32(frsz * count);
 517         if (!gspca_dev->frbuf) {
 518                 pr_err("frame alloc failed\n");
 519                 return -ENOMEM;
 520         }
 521         gspca_dev->capt_file = file;
 522         gspca_dev->memory = memory;
 523         gspca_dev->frsz = frsz;
 524         gspca_dev->nframes = count;
 525         for (i = 0; i < count; i++) {
 526                 frame = &gspca_dev->frame[i];
 527                 frame->v4l2_buf.index = i;
 528                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 529                 frame->v4l2_buf.flags = 0;
 530                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 531                 frame->v4l2_buf.length = frsz;
 532                 frame->v4l2_buf.memory = memory;
 533                 frame->v4l2_buf.sequence = 0;
 534                 frame->data = gspca_dev->frbuf + i * frsz;
 535                 frame->v4l2_buf.m.offset = i * frsz;
 536         }
 537         atomic_set(&gspca_dev->fr_q, 0);
 538         atomic_set(&gspca_dev->fr_i, 0);
 539         gspca_dev->fr_o = 0;
 540         return 0;
 541 }
 542
 543 static void frame_free(struct gspca_dev *gspca_dev)
 544 {
 545         int i;
 546
 547         PDEBUG(D_STREAM, "frame free");
 548         if (gspca_dev->frbuf != NULL) {
 549                 vfree(gspca_dev->frbuf);
 550                 gspca_dev->frbuf = NULL;
 551                 for (i = 0; i < gspca_dev->nframes; i++)
 552                         gspca_dev->frame[i].data = NULL;
 553         }
 554         gspca_dev->nframes = 0;
 555         gspca_dev->frsz = 0;
 556         gspca_dev->capt_file = NULL;
 557         gspca_dev->memory = GSPCA_MEMORY_NO;
 558 }
 559
 560 static void destroy_urbs(struct gspca_dev *gspca_dev)
 561 {
 562         struct urb *urb;
 563         unsigned int i;
 564
 565         PDEBUG(D_STREAM, "kill transfer");
 566         for (i = 0; i < MAX_NURBS; i++) {
 567                 urb = gspca_dev->urb[i];
 568                 if (urb == NULL)
 569                         break;
 570
 571                 gspca_dev->urb[i] = NULL;
 572                 usb_kill_urb(urb);
 573                 if (urb->transfer_buffer != NULL)
 574                         usb_free_coherent(gspca_dev->dev,
 575                                           urb->transfer_buffer_length,
 576                                           urb->transfer_buffer,
 577                                           urb->transfer_dma);
 578                 usb_free_urb(urb);
 579         }
 580 }
 581
 582 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 583 {
 584         int ret;
 585
 586         if (gspca_dev->alt == 0)
 587                 return 0;
 588         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 589         if (ret < 0)
 590                 pr_err("set alt 0 err %d\n", ret);
 591         return ret;
 592 }
 593
 594 /* Note: both the queue and the usb locks should be held when calling this */
 595 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 596 {
 597         gspca_dev->streaming = 0;
 598         gspca_dev->usb_err = 0;
 599         if (gspca_dev->sd_desc->stopN)
 600                 gspca_dev->sd_desc->stopN(gspca_dev);
 601         destroy_urbs(gspca_dev);
 602         gspca_input_destroy_urb(gspca_dev);
 603         gspca_set_alt0(gspca_dev);
 604         gspca_input_create_urb(gspca_dev);
 605         if (gspca_dev->sd_desc->stop0)
 606                 gspca_dev->sd_desc->stop0(gspca_dev);
 607         PDEBUG(D_STREAM, "stream off OK");
 608 }
 609
 610 /*
 611  * look for an input transfer endpoint in an alternate setting
 612  */
 613 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 614                                           int xfer)
 615 {
 616         struct usb_host_endpoint *ep;
 617         int i, attr;
 618
 619         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 620                 ep = &alt->endpoint[i];
 621                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 622                 if (attr == xfer
 623                     && ep->desc.wMaxPacketSize != 0
 624                     && usb_endpoint_dir_in(&ep->desc))
 625                         return ep;
 626         }
 627         return NULL;
 628 }
 629
 630 /* compute the minimum bandwidth for the current transfer */
 631 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 632 {
 633         u32 bandwidth;
 634         int i;
 635
 636         /* get the (max) image size */
 637         i = gspca_dev->curr_mode;
 638         bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
 639
 640         /* if the image is compressed, estimate its mean size */
 641         if (!gspca_dev->cam.needs_full_bandwidth &&
 642             bandwidth < gspca_dev->cam.cam_mode[i].width *
 643                                 gspca_dev->cam.cam_mode[i].height)
 644                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 645
 646         /* estimate the frame rate */
 647         if (gspca_dev->sd_desc->get_streamparm) {
 648                 struct v4l2_streamparm parm;
 649
 650                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 651                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 652                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 653         } else {
 654
 655                 /* don't hope more than 15 fps with USB 1.1 and
 656                  * image resolution >= 640x480 */
 657                 if (gspca_dev->width >= 640
 658                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 659                         bandwidth *= 15;                /* 15 fps */
 660                 else
 661                         bandwidth *= 30;                /* 30 fps */
 662         }
 663
 664         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 665         return bandwidth;
 666 }
 667
 668 /* endpoint table */
 669 #define MAX_ALT 16
 670 struct ep_tb_s {
 671         u32 alt;
 672         u32 bandwidth;
 673 };
 674
 675 /*
 676  * build the table of the endpoints
 677  * and compute the minimum bandwidth for the image transfer
 678  */
 679 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 680                         struct usb_interface *intf,
 681                         struct ep_tb_s *ep_tb)
 682 {
 683         struct usb_host_endpoint *ep;
 684         int i, j, nbalt, psize, found;
 685         u32 bandwidth, last_bw;
 686
 687         nbalt = intf->num_altsetting;
 688         if (nbalt > MAX_ALT)
 689                 nbalt = MAX_ALT;        /* fixme: should warn */
 690
 691         /* build the endpoint table */
 692         i = 0;
 693         last_bw = 0;
 694         for (;;) {
 695                 ep_tb->bandwidth = 2000 * 2000 * 120;
 696                 found = 0;
 697                 for (j = 0; j < nbalt; j++) {
 698                         ep = alt_xfer(&intf->altsetting[j],
 699                                       USB_ENDPOINT_XFER_ISOC);
 700                         if (ep == NULL)
 701                                 continue;
 702                         if (ep->desc.bInterval == 0) {
 703                                 pr_err("alt %d iso endp with 0 interval\n", j);
 704                                 continue;
 705                         }
 706                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 707                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 708                         bandwidth = psize * 1000;
 709                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 710                          || gspca_dev->dev->speed == USB_SPEED_SUPER)
 711                                 bandwidth *= 8;
 712                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 713                         if (bandwidth <= last_bw)
 714                                 continue;
 715                         if (bandwidth < ep_tb->bandwidth) {
 716                                 ep_tb->bandwidth = bandwidth;
 717                                 ep_tb->alt = j;
 718                                 found = 1;
 719                         }
 720                 }
 721                 if (!found)
 722                         break;
 723                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 724                                 ep_tb->alt, ep_tb->bandwidth);
 725                 last_bw = ep_tb->bandwidth;
 726                 i++;
 727                 ep_tb++;
 728         }
 729
 730         /*
 731          * If the camera:
 732          * has a usb audio class interface (a built in usb mic); and
 733          * is a usb 1 full speed device; and
 734          * uses the max full speed iso bandwidth; and
 735          * and has more than 1 alt setting
 736          * then skip the highest alt setting to spare bandwidth for the mic
 737          */
 738         if (gspca_dev->audio &&
 739                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 740                         last_bw >= 1000000 &&
 741                         i > 1) {
 742                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 743                 i--;
 744                 ep_tb--;
 745         }
 746
 747         /* get the requested bandwidth and start at the highest atlsetting */
 748         bandwidth = which_bandwidth(gspca_dev);
 749         ep_tb--;
 750         while (i > 1) {
 751                 ep_tb--;
 752                 if (ep_tb->bandwidth < bandwidth)
 753                         break;
 754                 i--;
 755         }
 756         return i;
 757 }
 758
 759 /*
 760  * create the URBs for image transfer
 761  */
 762 static int create_urbs(struct gspca_dev *gspca_dev,
 763                         struct usb_host_endpoint *ep)
 764 {
 765         struct urb *urb;
 766         int n, nurbs, i, psize, npkt, bsize;
 767
 768         /* calculate the packet size and the number of packets */
 769         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 770
 771         if (!gspca_dev->cam.bulk) {             /* isoc */
 772
 773                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 774                 if (gspca_dev->pkt_size == 0)
 775                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 776                 else
 777                         psize = gspca_dev->pkt_size;
 778                 npkt = gspca_dev->cam.npkt;
 779                 if (npkt == 0)
 780                         npkt = 32;              /* default value */
 781                 bsize = psize * npkt;
 782                 PDEBUG(D_STREAM,
 783                         "isoc %d pkts size %d = bsize:%d",
 784                         npkt, psize, bsize);
 785                 nurbs = DEF_NURBS;
 786         } else {                                /* bulk */
 787                 npkt = 0;
 788                 bsize = gspca_dev->cam.bulk_size;
 789                 if (bsize == 0)
 790                         bsize = psize;
 791                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 792                 if (gspca_dev->cam.bulk_nurbs != 0)
 793                         nurbs = gspca_dev->cam.bulk_nurbs;
 794                 else
 795                         nurbs = 1;
 796         }
 797
 798         for (n = 0; n < nurbs; n++) {
 799                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 800                 if (!urb) {
 801                         pr_err("usb_alloc_urb failed\n");
 802                         return -ENOMEM;
 803                 }
 804                 gspca_dev->urb[n] = urb;
 805                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 806                                                 bsize,
 807                                                 GFP_KERNEL,
 808                                                 &urb->transfer_dma);
 809
 810                 if (urb->transfer_buffer == NULL) {
 811                         pr_err("usb_alloc_coherent failed\n");
 812                         return -ENOMEM;
 813                 }
 814                 urb->dev = gspca_dev->dev;
 815                 urb->context = gspca_dev;
 816                 urb->transfer_buffer_length = bsize;
 817                 if (npkt != 0) {                /* ISOC */
 818                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 819                                                     ep->desc.bEndpointAddress);
 820                         urb->transfer_flags = URB_ISO_ASAP
 821                                         | URB_NO_TRANSFER_DMA_MAP;
 822                         urb->interval = 1 << (ep->desc.bInterval - 1);
 823                         urb->complete = isoc_irq;
 824                         urb->number_of_packets = npkt;
 825                         for (i = 0; i < npkt; i++) {
 826                                 urb->iso_frame_desc[i].length = psize;
 827                                 urb->iso_frame_desc[i].offset = psize * i;
 828                         }
 829                 } else {                /* bulk */
 830                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 831                                                 ep->desc.bEndpointAddress);
 832                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 833                         urb->complete = bulk_irq;
 834                 }
 835         }
 836         return 0;
 837 }
 838
 839 /*
 840  * start the USB transfer
 841  */
 842 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 843 {
 844         struct usb_interface *intf;
 845         struct usb_host_endpoint *ep;
 846         struct urb *urb;
 847         struct ep_tb_s ep_tb[MAX_ALT];
 848         int n, ret, xfer, alt, alt_idx;
 849
 850         /* reset the streaming variables */
 851         gspca_dev->image = NULL;
 852         gspca_dev->image_len = 0;
 853         gspca_dev->last_packet_type = DISCARD_PACKET;
 854         gspca_dev->sequence = 0;
 855
 856         gspca_dev->usb_err = 0;
 857
 858         /* do the specific subdriver stuff before endpoint selection */
 859         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 860         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 861         if (gspca_dev->sd_desc->isoc_init) {
 862                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 863                 if (ret < 0)
 864                         return ret;
 865         }
 866         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 867                                    : USB_ENDPOINT_XFER_ISOC;
 868
 869         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 870         if (gspca_dev->alt != 0) {
 871                 gspca_dev->alt--;       /* (previous version compatibility) */
 872                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
 873                 if (ep == NULL) {
 874                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 875                         return -EIO;
 876                 }
 877                 ep_tb[0].alt = gspca_dev->alt;
 878                 alt_idx = 1;
 879         } else {
 880
 881         /* else, compute the minimum bandwidth
 882          * and build the endpoint table */
 883                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 884                 if (alt_idx <= 0) {
 885                         pr_err("no transfer endpoint found\n");
 886                         return -EIO;
 887                 }
 888         }
 889
 890         /* set the highest alternate setting and
 891          * loop until urb submit succeeds */
 892         gspca_input_destroy_urb(gspca_dev);
 893
 894         gspca_dev->alt = ep_tb[--alt_idx].alt;
 895         alt = -1;
 896         for (;;) {
 897                 if (alt != gspca_dev->alt) {
 898                         alt = gspca_dev->alt;
 899                         if (intf->num_altsetting > 1) {
 900                                 ret = usb_set_interface(gspca_dev->dev,
 901                                                         gspca_dev->iface,
 902                                                         alt);
 903                                 if (ret < 0) {
 904                                         if (ret == -ENOSPC)
 905                                                 goto retry; /*fixme: ugly*/
 906                                         pr_err("set alt %d err %d\n", alt, ret);
 907                                         goto out;
 908                                 }
 909                         }
 910                 }
 911                 if (!gspca_dev->cam.no_urb_create) {
 912                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 913                         ret = create_urbs(gspca_dev,
 914                                 alt_xfer(&intf->altsetting[alt], xfer));
 915                         if (ret < 0) {
 916                                 destroy_urbs(gspca_dev);
 917                                 goto out;
 918                         }
 919                 }
 920
 921                 /* clear the bulk endpoint */
 922                 if (gspca_dev->cam.bulk)
 923                         usb_clear_halt(gspca_dev->dev,
 924                                         gspca_dev->urb[0]->pipe);
 925
 926                 /* start the cam */
 927                 ret = gspca_dev->sd_desc->start(gspca_dev);
 928                 if (ret < 0) {
 929                         destroy_urbs(gspca_dev);
 930                         goto out;
 931                 }
 932                 gspca_dev->streaming = 1;
 933                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 934
 935                 /* some bulk transfers are started by the subdriver */
 936                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 937                         break;
 938
 939                 /* submit the URBs */
 940                 for (n = 0; n < MAX_NURBS; n++) {
 941                         urb = gspca_dev->urb[n];
 942                         if (urb == NULL)
 943                                 break;
 944                         ret = usb_submit_urb(urb, GFP_KERNEL);
 945                         if (ret < 0)
 946                                 break;
 947                 }
 948                 if (ret >= 0)
 949                         break;                  /* transfer is started */
 950
 951                 /* something when wrong
 952                  * stop the webcam and free the transfer resources */
 953                 gspca_stream_off(gspca_dev);
 954                 if (ret != -ENOSPC) {
 955                         pr_err("usb_submit_urb alt %d err %d\n",
 956                                gspca_dev->alt, ret);
 957                         goto out;
 958                 }
 959
 960                 /* the bandwidth is not wide enough
 961                  * negotiate or try a lower alternate setting */
 962 retry:
 963                 PDEBUG(D_ERR|D_STREAM,
 964                         "alt %d - bandwidth not wide enough - trying again",
 965                         alt);
 966                 msleep(20);     /* wait for kill complete */
 967                 if (gspca_dev->sd_desc->isoc_nego) {
 968                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 969                         if (ret < 0)
 970                                 goto out;
 971                 } else {
 972                         if (alt_idx <= 0) {
 973                                 pr_err("no transfer endpoint found\n");
 974                                 ret = -EIO;
 975                                 goto out;
 976                         }
 977                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 978                 }
 979         }
 980 out:
 981         gspca_input_create_urb(gspca_dev);
 982         return ret;
 983 }
 984
 985 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 986 {
 987         struct gspca_ctrl *ctrl;
 988         int i;
 989
 990         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 991         gspca_dev->curr_mode = i;
 992         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 993         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 994         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 995
 996         /* set the current control values to their default values
 997          * which may have changed in sd_init() */
 998         /* does nothing if ctrl_handler == NULL */
 999         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
1000         ctrl = gspca_dev->cam.ctrls;
1001         if (ctrl != NULL) {
1002                 for (i = 0;
1003                      i < gspca_dev->sd_desc->nctrls;
1004                      i++, ctrl++)
1005                         ctrl->val = ctrl->def;
1006         }
1007 }
1008
1009 static int wxh_to_mode(struct gspca_dev *gspca_dev,
1010                         int width, int height)
1011 {
1012         int i;
1013
1014         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1015                 if (width >= gspca_dev->cam.cam_mode[i].width
1016                     && height >= gspca_dev->cam.cam_mode[i].height)
1017                         break;
1018         }
1019         return i;
1020 }
1021
1022 /*
1023  * search a mode with the right pixel format
1024  */
1025 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1026                         int mode,
1027                         int pixfmt)
1028 {
1029         int modeU, modeD;
1030
1031         modeU = modeD = mode;
1032         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1033                 if (--modeD >= 0) {
1034                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1035                                                                 == pixfmt)
1036                                 return modeD;
1037                 }
1038                 if (++modeU < gspca_dev->cam.nmodes) {
1039                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1040                                                                 == pixfmt)
1041                                 return modeU;
1042                 }
1043         }
1044         return -EINVAL;
1045 }
1046
1047 #ifdef CONFIG_VIDEO_ADV_DEBUG
1048 static int vidioc_g_register(struct file *file, void *priv,
1049                         struct v4l2_dbg_register *reg)
1050 {
1051         struct gspca_dev *gspca_dev = video_drvdata(file);
1052
1053         gspca_dev->usb_err = 0;
1054         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1055 }
1056
1057 static int vidioc_s_register(struct file *file, void *priv,
1058                         struct v4l2_dbg_register *reg)
1059 {
1060         struct gspca_dev *gspca_dev = video_drvdata(file);
1061
1062         gspca_dev->usb_err = 0;
1063         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1064 }
1065 #endif
1066
1067 static int vidioc_g_chip_ident(struct file *file, void *priv,
1068                         struct v4l2_dbg_chip_ident *chip)
1069 {
1070         struct gspca_dev *gspca_dev = video_drvdata(file);
1071
1072         gspca_dev->usb_err = 0;
1073         return gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1074 }
1075
1076 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1077                                 struct v4l2_fmtdesc *fmtdesc)
1078 {
1079         struct gspca_dev *gspca_dev = video_drvdata(file);
1080         int i, j, index;
1081         __u32 fmt_tb[8];
1082
1083         /* give an index to each format */
1084         index = 0;
1085         j = 0;
1086         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1087                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1088                 j = 0;
1089                 for (;;) {
1090                         if (fmt_tb[j] == fmt_tb[index])
1091                                 break;
1092                         j++;
1093                 }
1094                 if (j == index) {
1095                         if (fmtdesc->index == index)
1096                                 break;          /* new format */
1097                         index++;
1098                         if (index >= ARRAY_SIZE(fmt_tb))
1099                                 return -EINVAL;
1100                 }
1101         }
1102         if (i < 0)
1103                 return -EINVAL;         /* no more format */
1104
1105         fmtdesc->pixelformat = fmt_tb[index];
1106         if (gspca_dev->cam.cam_mode[i].sizeimage <
1107                         gspca_dev->cam.cam_mode[i].width *
1108                                 gspca_dev->cam.cam_mode[i].height)
1109                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1110         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1111         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1112         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1113         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1114         fmtdesc->description[4] = '\0';
1115         return 0;
1116 }
1117
1118 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1119                             struct v4l2_format *fmt)
1120 {
1121         struct gspca_dev *gspca_dev = video_drvdata(file);
1122         int mode;
1123
1124         mode = gspca_dev->curr_mode;
1125         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1126         /* some drivers use priv internally, zero it before giving it to
1127            userspace */
1128         fmt->fmt.pix.priv = 0;
1129         return 0;
1130 }
1131
1132 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1133                         struct v4l2_format *fmt)
1134 {
1135         int w, h, mode, mode2;
1136
1137         w = fmt->fmt.pix.width;
1138         h = fmt->fmt.pix.height;
1139
1140 #ifdef GSPCA_DEBUG
1141         if (gspca_debug & D_CONF)
1142                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1143 #endif
1144         /* search the closest mode for width and height */
1145         mode = wxh_to_mode(gspca_dev, w, h);
1146
1147         /* OK if right palette */
1148         if (gspca_dev->cam.cam_mode[mode].pixelformat
1149                                                 != fmt->fmt.pix.pixelformat) {
1150
1151                 /* else, search the closest mode with the same pixel format */
1152                 mode2 = gspca_get_mode(gspca_dev, mode,
1153                                         fmt->fmt.pix.pixelformat);
1154                 if (mode2 >= 0)
1155                         mode = mode2;
1156 /*              else
1157                         ;                * no chance, return this mode */
1158         }
1159         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1160         /* some drivers use priv internally, zero it before giving it to
1161            userspace */
1162         fmt->fmt.pix.priv = 0;
1163         return mode;                    /* used when s_fmt */
1164 }
1165
1166 static int vidioc_try_fmt_vid_cap(struct file *file,
1167                               void *priv,
1168                               struct v4l2_format *fmt)
1169 {
1170         struct gspca_dev *gspca_dev = video_drvdata(file);
1171         int ret;
1172
1173         ret = try_fmt_vid_cap(gspca_dev, fmt);
1174         if (ret < 0)
1175                 return ret;
1176         return 0;
1177 }
1178
1179 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1180                             struct v4l2_format *fmt)
1181 {
1182         struct gspca_dev *gspca_dev = video_drvdata(file);
1183         int ret;
1184
1185         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1186                 return -ERESTARTSYS;
1187
1188         ret = try_fmt_vid_cap(gspca_dev, fmt);
1189         if (ret < 0)
1190                 goto out;
1191
1192         if (gspca_dev->nframes != 0
1193             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1194                 ret = -EINVAL;
1195                 goto out;
1196         }
1197
1198         if (ret == gspca_dev->curr_mode) {
1199                 ret = 0;
1200                 goto out;                       /* same mode */
1201         }
1202
1203         if (gspca_dev->streaming) {
1204                 ret = -EBUSY;
1205                 goto out;
1206         }
1207         gspca_dev->width = fmt->fmt.pix.width;
1208         gspca_dev->height = fmt->fmt.pix.height;
1209         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1210         gspca_dev->curr_mode = ret;
1211
1212         ret = 0;
1213 out:
1214         mutex_unlock(&gspca_dev->queue_lock);
1215         return ret;
1216 }
1217
1218 static int vidioc_enum_framesizes(struct file *file, void *priv,
1219                                   struct v4l2_frmsizeenum *fsize)
1220 {
1221         struct gspca_dev *gspca_dev = video_drvdata(file);
1222         int i;
1223         __u32 index = 0;
1224
1225         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1226                 if (fsize->pixel_format !=
1227                                 gspca_dev->cam.cam_mode[i].pixelformat)
1228                         continue;
1229
1230                 if (fsize->index == index) {
1231                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1232                         fsize->discrete.width =
1233                                 gspca_dev->cam.cam_mode[i].width;
1234                         fsize->discrete.height =
1235                                 gspca_dev->cam.cam_mode[i].height;
1236                         return 0;
1237                 }
1238                 index++;
1239         }
1240
1241         return -EINVAL;
1242 }
1243
1244 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1245                                       struct v4l2_frmivalenum *fival)
1246 {
1247         struct gspca_dev *gspca_dev = video_drvdata(filp);
1248         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1249         __u32 i;
1250
1251         if (gspca_dev->cam.mode_framerates == NULL ||
1252                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1253                 return -EINVAL;
1254
1255         if (fival->pixel_format !=
1256                         gspca_dev->cam.cam_mode[mode].pixelformat)
1257                 return -EINVAL;
1258
1259         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1260                 if (fival->index == i) {
1261                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1262                         fival->discrete.numerator = 1;
1263                         fival->discrete.denominator =
1264                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1265                         return 0;
1266                 }
1267         }
1268
1269         return -EINVAL;
1270 }
1271
1272 static void gspca_release(struct v4l2_device *v4l2_device)
1273 {
1274         struct gspca_dev *gspca_dev =
1275                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1276
1277         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1278         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1279         kfree(gspca_dev->usb_buf);
1280         kfree(gspca_dev);
1281 }
1282
1283 static int dev_open(struct file *file)
1284 {
1285         struct gspca_dev *gspca_dev = video_drvdata(file);
1286
1287         PDEBUG(D_STREAM, "[%s] open", current->comm);
1288
1289         /* protect the subdriver against rmmod */
1290         if (!try_module_get(gspca_dev->module))
1291                 return -ENODEV;
1292
1293 #ifdef GSPCA_DEBUG
1294         /* activate the v4l2 debug */
1295         if (gspca_debug & D_V4L2)
1296                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1297                                         | V4L2_DEBUG_IOCTL_ARG;
1298         else
1299                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1300                                         | V4L2_DEBUG_IOCTL_ARG);
1301 #endif
1302         return v4l2_fh_open(file);
1303 }
1304
1305 static int dev_close(struct file *file)
1306 {
1307         struct gspca_dev *gspca_dev = video_drvdata(file);
1308
1309         PDEBUG(D_STREAM, "[%s] close", current->comm);
1310
1311         /* Needed for gspca_stream_off, always lock before queue_lock! */
1312         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1313                 return -ERESTARTSYS;
1314
1315         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1316                 mutex_unlock(&gspca_dev->usb_lock);
1317                 return -ERESTARTSYS;
1318         }
1319
1320         /* if the file did the capture, free the streaming resources */
1321         if (gspca_dev->capt_file == file) {
1322                 if (gspca_dev->streaming)
1323                         gspca_stream_off(gspca_dev);
1324                 frame_free(gspca_dev);
1325         }
1326         module_put(gspca_dev->module);
1327         mutex_unlock(&gspca_dev->queue_lock);
1328         mutex_unlock(&gspca_dev->usb_lock);
1329
1330         PDEBUG(D_STREAM, "close done");
1331
1332         return v4l2_fh_release(file);
1333 }
1334
1335 static int vidioc_querycap(struct file *file, void  *priv,
1336                            struct v4l2_capability *cap)
1337 {
1338         struct gspca_dev *gspca_dev = video_drvdata(file);
1339
1340         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1341                         sizeof cap->driver);
1342         if (gspca_dev->dev->product != NULL) {
1343                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1344                         sizeof cap->card);
1345         } else {
1346                 snprintf((char *) cap->card, sizeof cap->card,
1347                         "USB Camera (%04x:%04x)",
1348                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1349                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1350         }
1351         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1352                         sizeof(cap->bus_info));
1353         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1354                           | V4L2_CAP_STREAMING
1355                           | V4L2_CAP_READWRITE;
1356         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1357         return 0;
1358 }
1359
1360 static int get_ctrl(struct gspca_dev *gspca_dev,
1361                                    int id)
1362 {
1363         const struct ctrl *ctrls;
1364         int i;
1365
1366         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1367              i < gspca_dev->sd_desc->nctrls;
1368              i++, ctrls++) {
1369                 if (gspca_dev->ctrl_dis & (1 << i))
1370                         continue;
1371                 if (id == ctrls->qctrl.id)
1372                         return i;
1373         }
1374         return -1;
1375 }
1376
1377 static int vidioc_queryctrl(struct file *file, void *priv,
1378                            struct v4l2_queryctrl *q_ctrl)
1379 {
1380         struct gspca_dev *gspca_dev = video_drvdata(file);
1381         const struct ctrl *ctrls;
1382         struct gspca_ctrl *gspca_ctrl;
1383         int i, idx;
1384         u32 id;
1385
1386         id = q_ctrl->id;
1387         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1388                 id &= V4L2_CTRL_ID_MASK;
1389                 id++;
1390                 idx = -1;
1391                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1392                         if (gspca_dev->ctrl_dis & (1 << i))
1393                                 continue;
1394                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1395                                 continue;
1396                         if (idx >= 0
1397                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1398                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1399                                 continue;
1400                         idx = i;
1401                 }
1402         } else {
1403                 idx = get_ctrl(gspca_dev, id);
1404         }
1405         if (idx < 0)
1406                 return -EINVAL;
1407         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1408         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1409         if (gspca_dev->cam.ctrls != NULL) {
1410                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1411                 q_ctrl->default_value = gspca_ctrl->def;
1412                 q_ctrl->minimum = gspca_ctrl->min;
1413                 q_ctrl->maximum = gspca_ctrl->max;
1414         }
1415         if (gspca_dev->ctrl_inac & (1 << idx))
1416                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1417         return 0;
1418 }
1419
1420 static int vidioc_s_ctrl(struct file *file, void *priv,
1421                          struct v4l2_control *ctrl)
1422 {
1423         struct gspca_dev *gspca_dev = video_drvdata(file);
1424         const struct ctrl *ctrls;
1425         struct gspca_ctrl *gspca_ctrl;
1426         int idx;
1427
1428         idx = get_ctrl(gspca_dev, ctrl->id);
1429         if (idx < 0)
1430                 return -EINVAL;
1431         if (gspca_dev->ctrl_inac & (1 << idx))
1432                 return -EINVAL;
1433         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1434         if (gspca_dev->cam.ctrls != NULL) {
1435                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1436                 if (ctrl->value < gspca_ctrl->min
1437                     || ctrl->value > gspca_ctrl->max)
1438                         return -ERANGE;
1439         } else {
1440                 gspca_ctrl = NULL;
1441                 if (ctrl->value < ctrls->qctrl.minimum
1442                     || ctrl->value > ctrls->qctrl.maximum)
1443                         return -ERANGE;
1444         }
1445         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1446         gspca_dev->usb_err = 0;
1447         if (ctrls->set != NULL)
1448                 return ctrls->set(gspca_dev, ctrl->value);
1449         if (gspca_ctrl != NULL) {
1450                 gspca_ctrl->val = ctrl->value;
1451                 if (ctrls->set_control != NULL
1452                  && gspca_dev->streaming)
1453                         ctrls->set_control(gspca_dev);
1454         }
1455         return gspca_dev->usb_err;
1456 }
1457
1458 static int vidioc_g_ctrl(struct file *file, void *priv,
1459                          struct v4l2_control *ctrl)
1460 {
1461         struct gspca_dev *gspca_dev = video_drvdata(file);
1462         const struct ctrl *ctrls;
1463         int idx;
1464
1465         idx = get_ctrl(gspca_dev, ctrl->id);
1466         if (idx < 0)
1467                 return -EINVAL;
1468         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1469
1470         gspca_dev->usb_err = 0;
1471         if (ctrls->get != NULL)
1472                 return ctrls->get(gspca_dev, &ctrl->value);
1473         if (gspca_dev->cam.ctrls != NULL)
1474                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1475         return 0;
1476 }
1477
1478 static int vidioc_querymenu(struct file *file, void *priv,
1479                             struct v4l2_querymenu *qmenu)
1480 {
1481         struct gspca_dev *gspca_dev = video_drvdata(file);
1482
1483         if (!gspca_dev->sd_desc->querymenu)
1484                 return -ENOTTY;
1485         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1486 }
1487
1488 static int vidioc_enum_input(struct file *file, void *priv,
1489                                 struct v4l2_input *input)
1490 {
1491         struct gspca_dev *gspca_dev = video_drvdata(file);
1492
1493         if (input->index != 0)
1494                 return -EINVAL;
1495         input->type = V4L2_INPUT_TYPE_CAMERA;
1496         input->status = gspca_dev->cam.input_flags;
1497         strlcpy(input->name, gspca_dev->sd_desc->name,
1498                 sizeof input->name);
1499         return 0;
1500 }
1501
1502 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1503 {
1504         *i = 0;
1505         return 0;
1506 }
1507
1508 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1509 {
1510         if (i > 0)
1511                 return -EINVAL;
1512         return (0);
1513 }
1514
1515 static int vidioc_reqbufs(struct file *file, void *priv,
1516                           struct v4l2_requestbuffers *rb)
1517 {
1518         struct gspca_dev *gspca_dev = video_drvdata(file);
1519         int i, ret = 0, streaming;
1520
1521         i = rb->memory;                 /* (avoid compilation warning) */
1522         switch (i) {
1523         case GSPCA_MEMORY_READ:                 /* (internal call) */
1524         case V4L2_MEMORY_MMAP:
1525         case V4L2_MEMORY_USERPTR:
1526                 break;
1527         default:
1528                 return -EINVAL;
1529         }
1530         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1531                 return -ERESTARTSYS;
1532
1533         if (gspca_dev->memory != GSPCA_MEMORY_NO
1534             && gspca_dev->memory != GSPCA_MEMORY_READ
1535             && gspca_dev->memory != rb->memory) {
1536                 ret = -EBUSY;
1537                 goto out;
1538         }
1539
1540         /* only one file may do the capture */
1541         if (gspca_dev->capt_file != NULL
1542             && gspca_dev->capt_file != file) {
1543                 ret = -EBUSY;
1544                 goto out;
1545         }
1546
1547         /* if allocated, the buffers must not be mapped */
1548         for (i = 0; i < gspca_dev->nframes; i++) {
1549                 if (gspca_dev->frame[i].vma_use_count) {
1550                         ret = -EBUSY;
1551                         goto out;
1552                 }
1553         }
1554
1555         /* stop streaming */
1556         streaming = gspca_dev->streaming;
1557         if (streaming) {
1558                 gspca_stream_off(gspca_dev);
1559
1560                 /* Don't restart the stream when switching from read
1561                  * to mmap mode */
1562                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1563                         streaming = 0;
1564         }
1565
1566         /* free the previous allocated buffers, if any */
1567         if (gspca_dev->nframes != 0)
1568                 frame_free(gspca_dev);
1569         if (rb->count == 0)                     /* unrequest */
1570                 goto out;
1571         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1572         if (ret == 0) {
1573                 rb->count = gspca_dev->nframes;
1574                 if (streaming)
1575                         ret = gspca_init_transfer(gspca_dev);
1576         }
1577 out:
1578         mutex_unlock(&gspca_dev->queue_lock);
1579         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1580         return ret;
1581 }
1582
1583 static int vidioc_querybuf(struct file *file, void *priv,
1584                            struct v4l2_buffer *v4l2_buf)
1585 {
1586         struct gspca_dev *gspca_dev = video_drvdata(file);
1587         struct gspca_frame *frame;
1588
1589         if (v4l2_buf->index < 0
1590             || v4l2_buf->index >= gspca_dev->nframes)
1591                 return -EINVAL;
1592
1593         frame = &gspca_dev->frame[v4l2_buf->index];
1594         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1595         return 0;
1596 }
1597
1598 static int vidioc_streamon(struct file *file, void *priv,
1599                            enum v4l2_buf_type buf_type)
1600 {
1601         struct gspca_dev *gspca_dev = video_drvdata(file);
1602         int ret;
1603
1604         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1605                 return -EINVAL;
1606         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1607                 return -ERESTARTSYS;
1608
1609         /* check the capture file */
1610         if (gspca_dev->capt_file != file) {
1611                 ret = -EBUSY;
1612                 goto out;
1613         }
1614
1615         if (gspca_dev->nframes == 0
1616             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1617                 ret = -EINVAL;
1618                 goto out;
1619         }
1620         if (!gspca_dev->streaming) {
1621                 ret = gspca_init_transfer(gspca_dev);
1622                 if (ret < 0)
1623                         goto out;
1624         }
1625 #ifdef GSPCA_DEBUG
1626         if (gspca_debug & D_STREAM) {
1627                 PDEBUG_MODE("stream on OK",
1628                         gspca_dev->pixfmt,
1629                         gspca_dev->width,
1630                         gspca_dev->height);
1631         }
1632 #endif
1633         ret = 0;
1634 out:
1635         mutex_unlock(&gspca_dev->queue_lock);
1636         return ret;
1637 }
1638
1639 static int vidioc_streamoff(struct file *file, void *priv,
1640                                 enum v4l2_buf_type buf_type)
1641 {
1642         struct gspca_dev *gspca_dev = video_drvdata(file);
1643         int i, ret;
1644
1645         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1646                 return -EINVAL;
1647
1648         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1649                 return -ERESTARTSYS;
1650
1651         if (!gspca_dev->streaming) {
1652                 ret = 0;
1653                 goto out;
1654         }
1655
1656         /* check the capture file */
1657         if (gspca_dev->capt_file != file) {
1658                 ret = -EBUSY;
1659                 goto out;
1660         }
1661
1662         /* stop streaming */
1663         gspca_stream_off(gspca_dev);
1664         /* In case another thread is waiting in dqbuf */
1665         wake_up_interruptible(&gspca_dev->wq);
1666
1667         /* empty the transfer queues */
1668         for (i = 0; i < gspca_dev->nframes; i++)
1669                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1670         atomic_set(&gspca_dev->fr_q, 0);
1671         atomic_set(&gspca_dev->fr_i, 0);
1672         gspca_dev->fr_o = 0;
1673         ret = 0;
1674 out:
1675         mutex_unlock(&gspca_dev->queue_lock);
1676         return ret;
1677 }
1678
1679 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1680                         struct v4l2_jpegcompression *jpegcomp)
1681 {
1682         struct gspca_dev *gspca_dev = video_drvdata(file);
1683
1684         gspca_dev->usb_err = 0;
1685         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1686 }
1687
1688 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1689                         struct v4l2_jpegcompression *jpegcomp)
1690 {
1691         struct gspca_dev *gspca_dev = video_drvdata(file);
1692
1693         gspca_dev->usb_err = 0;
1694         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1695 }
1696
1697 static int vidioc_g_parm(struct file *filp, void *priv,
1698                         struct v4l2_streamparm *parm)
1699 {
1700         struct gspca_dev *gspca_dev = video_drvdata(filp);
1701
1702         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1703
1704         if (gspca_dev->sd_desc->get_streamparm) {
1705                 gspca_dev->usb_err = 0;
1706                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1707                 return gspca_dev->usb_err;
1708         }
1709         return 0;
1710 }
1711
1712 static int vidioc_s_parm(struct file *filp, void *priv,
1713                         struct v4l2_streamparm *parm)
1714 {
1715         struct gspca_dev *gspca_dev = video_drvdata(filp);
1716         int n;
1717
1718         n = parm->parm.capture.readbuffers;
1719         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1720                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1721         else
1722                 gspca_dev->nbufread = n;
1723
1724         if (gspca_dev->sd_desc->set_streamparm) {
1725                 gspca_dev->usb_err = 0;
1726                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1727                 return gspca_dev->usb_err;
1728         }
1729
1730         return 0;
1731 }
1732
1733 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1734 {
1735         struct gspca_dev *gspca_dev = video_drvdata(file);
1736         struct gspca_frame *frame;
1737         struct page *page;
1738         unsigned long addr, start, size;
1739         int i, ret;
1740
1741         start = vma->vm_start;
1742         size = vma->vm_end - vma->vm_start;
1743         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1744
1745         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1746                 return -ERESTARTSYS;
1747         if (gspca_dev->capt_file != file) {
1748                 ret = -EINVAL;
1749                 goto out;
1750         }
1751
1752         frame = NULL;
1753         for (i = 0; i < gspca_dev->nframes; ++i) {
1754                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1755                         PDEBUG(D_STREAM, "mmap bad memory type");
1756                         break;
1757                 }
1758                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1759                                                 == vma->vm_pgoff) {
1760                         frame = &gspca_dev->frame[i];
1761                         break;
1762                 }
1763         }
1764         if (frame == NULL) {
1765                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1766                 ret = -EINVAL;
1767                 goto out;
1768         }
1769         if (size != frame->v4l2_buf.length) {
1770                 PDEBUG(D_STREAM, "mmap bad size");
1771                 ret = -EINVAL;
1772                 goto out;
1773         }
1774
1775         /*
1776          * - VM_IO marks the area as being a mmaped region for I/O to a
1777          *   device. It also prevents the region from being core dumped.
1778          */
1779         vma->vm_flags |= VM_IO;
1780
1781         addr = (unsigned long) frame->data;
1782         while (size > 0) {
1783                 page = vmalloc_to_page((void *) addr);
1784                 ret = vm_insert_page(vma, start, page);
1785                 if (ret < 0)
1786                         goto out;
1787                 start += PAGE_SIZE;
1788                 addr += PAGE_SIZE;
1789                 size -= PAGE_SIZE;
1790         }
1791
1792         vma->vm_ops = &gspca_vm_ops;
1793         vma->vm_private_data = frame;
1794         gspca_vm_open(vma);
1795         ret = 0;
1796 out:
1797         mutex_unlock(&gspca_dev->queue_lock);
1798         return ret;
1799 }
1800
1801 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1802                                 enum v4l2_memory memory)
1803 {
1804         if (!gspca_dev->present)
1805                 return -ENODEV;
1806         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1807                         !gspca_dev->streaming)
1808                 return -EINVAL;
1809
1810         /* check if a frame is ready */
1811         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1812 }
1813
1814 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1815                         enum v4l2_memory memory)
1816 {
1817         int ret;
1818
1819         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1820                 return -ERESTARTSYS;
1821         ret = frame_ready_nolock(gspca_dev, file, memory);
1822         mutex_unlock(&gspca_dev->queue_lock);
1823         return ret;
1824 }
1825
1826 /*
1827  * dequeue a video buffer
1828  *
1829  * If nonblock_ing is false, block until a buffer is available.
1830  */
1831 static int vidioc_dqbuf(struct file *file, void *priv,
1832                         struct v4l2_buffer *v4l2_buf)
1833 {
1834         struct gspca_dev *gspca_dev = video_drvdata(file);
1835         struct gspca_frame *frame;
1836         int i, j, ret;
1837
1838         PDEBUG(D_FRAM, "dqbuf");
1839
1840         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1841                 return -ERESTARTSYS;
1842
1843         for (;;) {
1844                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1845                 if (ret < 0)
1846                         goto out;
1847                 if (ret > 0)
1848                         break;
1849
1850                 mutex_unlock(&gspca_dev->queue_lock);
1851
1852                 if (file->f_flags & O_NONBLOCK)
1853                         return -EAGAIN;
1854
1855                 /* wait till a frame is ready */
1856                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1857                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1858                         msecs_to_jiffies(3000));
1859                 if (ret < 0)
1860                         return ret;
1861                 if (ret == 0)
1862                         return -EIO;
1863
1864                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1865                         return -ERESTARTSYS;
1866         }
1867
1868         i = gspca_dev->fr_o;
1869         j = gspca_dev->fr_queue[i];
1870         frame = &gspca_dev->frame[j];
1871
1872         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1873
1874         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1875         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1876         PDEBUG(D_FRAM, "dqbuf %d", j);
1877         ret = 0;
1878
1879         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1880                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1881                                  frame->data,
1882                                  frame->v4l2_buf.bytesused)) {
1883                         PDEBUG(D_ERR|D_STREAM,
1884                                 "dqbuf cp to user failed");
1885                         ret = -EFAULT;
1886                 }
1887         }
1888 out:
1889         mutex_unlock(&gspca_dev->queue_lock);
1890
1891         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1892                 mutex_lock(&gspca_dev->usb_lock);
1893                 gspca_dev->usb_err = 0;
1894                 if (gspca_dev->present)
1895                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1896                 mutex_unlock(&gspca_dev->usb_lock);
1897         }
1898
1899         return ret;
1900 }
1901
1902 /*
1903  * queue a video buffer
1904  *
1905  * Attempting to queue a buffer that has already been
1906  * queued will return -EINVAL.
1907  */
1908 static int vidioc_qbuf(struct file *file, void *priv,
1909                         struct v4l2_buffer *v4l2_buf)
1910 {
1911         struct gspca_dev *gspca_dev = video_drvdata(file);
1912         struct gspca_frame *frame;
1913         int i, index, ret;
1914
1915         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1916
1917         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1918                 return -ERESTARTSYS;
1919
1920         index = v4l2_buf->index;
1921         if ((unsigned) index >= gspca_dev->nframes) {
1922                 PDEBUG(D_FRAM,
1923                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1924                 ret = -EINVAL;
1925                 goto out;
1926         }
1927         if (v4l2_buf->memory != gspca_dev->memory) {
1928                 PDEBUG(D_FRAM, "qbuf bad memory type");
1929                 ret = -EINVAL;
1930                 goto out;
1931         }
1932
1933         frame = &gspca_dev->frame[index];
1934         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1935                 PDEBUG(D_FRAM, "qbuf bad state");
1936                 ret = -EINVAL;
1937                 goto out;
1938         }
1939
1940         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1941
1942         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1943                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1944                 frame->v4l2_buf.length = v4l2_buf->length;
1945         }
1946
1947         /* put the buffer in the 'queued' queue */
1948         i = atomic_read(&gspca_dev->fr_q);
1949         gspca_dev->fr_queue[i] = index;
1950         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1951
1952         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1953         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1954         ret = 0;
1955 out:
1956         mutex_unlock(&gspca_dev->queue_lock);
1957         return ret;
1958 }
1959
1960 /*
1961  * allocate the resources for read()
1962  */
1963 static int read_alloc(struct gspca_dev *gspca_dev,
1964                         struct file *file)
1965 {
1966         struct v4l2_buffer v4l2_buf;
1967         int i, ret;
1968
1969         PDEBUG(D_STREAM, "read alloc");
1970
1971         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1972                 return -ERESTARTSYS;
1973
1974         if (gspca_dev->nframes == 0) {
1975                 struct v4l2_requestbuffers rb;
1976
1977                 memset(&rb, 0, sizeof rb);
1978                 rb.count = gspca_dev->nbufread;
1979                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1980                 rb.memory = GSPCA_MEMORY_READ;
1981                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1982                 if (ret != 0) {
1983                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1984                         goto out;
1985                 }
1986                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1987                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1988                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1989                 for (i = 0; i < gspca_dev->nbufread; i++) {
1990                         v4l2_buf.index = i;
1991                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1992                         if (ret != 0) {
1993                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1994                                 goto out;
1995                         }
1996                 }
1997         }
1998
1999         /* start streaming */
2000         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2001         if (ret != 0)
2002                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2003 out:
2004         mutex_unlock(&gspca_dev->usb_lock);
2005         return ret;
2006 }
2007
2008 static unsigned int dev_poll(struct file *file, poll_table *wait)
2009 {
2010         struct gspca_dev *gspca_dev = video_drvdata(file);
2011         unsigned long req_events = poll_requested_events(wait);
2012         int ret = 0;
2013
2014         PDEBUG(D_FRAM, "poll");
2015
2016         if (req_events & POLLPRI)
2017                 ret |= v4l2_ctrl_poll(file, wait);
2018
2019         if (req_events & (POLLIN | POLLRDNORM)) {
2020                 /* if reqbufs is not done, the user would use read() */
2021                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2022                         if (read_alloc(gspca_dev, file) != 0) {
2023                                 ret |= POLLERR;
2024                                 goto out;
2025                         }
2026                 }
2027
2028                 poll_wait(file, &gspca_dev->wq, wait);
2029
2030                 /* check if an image has been received */
2031                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
2032                         ret |= POLLERR;
2033                         goto out;
2034                 }
2035                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2036                         ret |= POLLIN | POLLRDNORM;
2037                 mutex_unlock(&gspca_dev->queue_lock);
2038         }
2039
2040 out:
2041         if (!gspca_dev->present)
2042                 ret |= POLLHUP;
2043
2044         return ret;
2045 }
2046
2047 static ssize_t dev_read(struct file *file, char __user *data,
2048                     size_t count, loff_t *ppos)
2049 {
2050         struct gspca_dev *gspca_dev = video_drvdata(file);
2051         struct gspca_frame *frame;
2052         struct v4l2_buffer v4l2_buf;
2053         struct timeval timestamp;
2054         int n, ret, ret2;
2055
2056         PDEBUG(D_FRAM, "read (%zd)", count);
2057         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2058                 ret = read_alloc(gspca_dev, file);
2059                 if (ret != 0)
2060                         return ret;
2061         }
2062
2063         /* get a frame */
2064         timestamp = ktime_to_timeval(ktime_get());
2065         timestamp.tv_sec--;
2066         n = 2;
2067         for (;;) {
2068                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2069                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2070                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2071                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2072                 if (ret != 0) {
2073                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2074                         return ret;
2075                 }
2076
2077                 /* if the process slept for more than 1 second,
2078                  * get a newer frame */
2079                 frame = &gspca_dev->frame[v4l2_buf.index];
2080                 if (--n < 0)
2081                         break;                  /* avoid infinite loop */
2082                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2083                         break;
2084                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2085                 if (ret != 0) {
2086                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2087                         return ret;
2088                 }
2089         }
2090
2091         /* copy the frame */
2092         if (count > frame->v4l2_buf.bytesused)
2093                 count = frame->v4l2_buf.bytesused;
2094         ret = copy_to_user(data, frame->data, count);
2095         if (ret != 0) {
2096                 PDEBUG(D_ERR|D_STREAM,
2097                         "read cp to user lack %d / %zd", ret, count);
2098                 ret = -EFAULT;
2099                 goto out;
2100         }
2101         ret = count;
2102 out:
2103         /* in each case, requeue the buffer */
2104         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2105         if (ret2 != 0)
2106                 return ret2;
2107         return ret;
2108 }
2109
2110 static struct v4l2_file_operations dev_fops = {
2111         .owner = THIS_MODULE,
2112         .open = dev_open,
2113         .release = dev_close,
2114         .read = dev_read,
2115         .mmap = dev_mmap,
2116         .unlocked_ioctl = video_ioctl2,
2117         .poll   = dev_poll,
2118 };
2119
2120 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2121         .vidioc_querycap        = vidioc_querycap,
2122         .vidioc_dqbuf           = vidioc_dqbuf,
2123         .vidioc_qbuf            = vidioc_qbuf,
2124         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2125         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2126         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2127         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2128         .vidioc_streamon        = vidioc_streamon,
2129         .vidioc_queryctrl       = vidioc_queryctrl,
2130         .vidioc_g_ctrl          = vidioc_g_ctrl,
2131         .vidioc_s_ctrl          = vidioc_s_ctrl,
2132         .vidioc_querymenu       = vidioc_querymenu,
2133         .vidioc_enum_input      = vidioc_enum_input,
2134         .vidioc_g_input         = vidioc_g_input,
2135         .vidioc_s_input         = vidioc_s_input,
2136         .vidioc_reqbufs         = vidioc_reqbufs,
2137         .vidioc_querybuf        = vidioc_querybuf,
2138         .vidioc_streamoff       = vidioc_streamoff,
2139         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2140         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2141         .vidioc_g_parm          = vidioc_g_parm,
2142         .vidioc_s_parm          = vidioc_s_parm,
2143         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2144         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2145 #ifdef CONFIG_VIDEO_ADV_DEBUG
2146         .vidioc_g_register      = vidioc_g_register,
2147         .vidioc_s_register      = vidioc_s_register,
2148 #endif
2149         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2150         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2151         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2152 };
2153
2154 static const struct video_device gspca_template = {
2155         .name = "gspca main driver",
2156         .fops = &dev_fops,
2157         .ioctl_ops = &dev_ioctl_ops,
2158         .release = video_device_release_empty, /* We use v4l2_dev.release */
2159 };
2160
2161 /* initialize the controls */
2162 static void ctrls_init(struct gspca_dev *gspca_dev)
2163 {
2164         struct gspca_ctrl *ctrl;
2165         int i;
2166
2167         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2168              i < gspca_dev->sd_desc->nctrls;
2169              i++, ctrl++) {
2170                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2171                 ctrl->val = ctrl->def;
2172                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2173                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2174         }
2175 }
2176
2177 /*
2178  * probe and create a new gspca device
2179  *
2180  * This function must be called by the sub-driver when it is
2181  * called for probing a new device.
2182  */
2183 int gspca_dev_probe2(struct usb_interface *intf,
2184                 const struct usb_device_id *id,
2185                 const struct sd_desc *sd_desc,
2186                 int dev_size,
2187                 struct module *module)
2188 {
2189         struct gspca_dev *gspca_dev;
2190         struct usb_device *dev = interface_to_usbdev(intf);
2191         int ret;
2192
2193         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2194                 sd_desc->name, id->idVendor, id->idProduct);
2195
2196         /* create the device */
2197         if (dev_size < sizeof *gspca_dev)
2198                 dev_size = sizeof *gspca_dev;
2199         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2200         if (!gspca_dev) {
2201                 pr_err("couldn't kzalloc gspca struct\n");
2202                 return -ENOMEM;
2203         }
2204         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2205         if (!gspca_dev->usb_buf) {
2206                 pr_err("out of memory\n");
2207                 ret = -ENOMEM;
2208                 goto out;
2209         }
2210         gspca_dev->dev = dev;
2211         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2212
2213         /* check if any audio device */
2214         if (dev->actconfig->desc.bNumInterfaces != 1) {
2215                 int i;
2216                 struct usb_interface *intf2;
2217
2218                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2219                         intf2 = dev->actconfig->interface[i];
2220                         if (intf2 != NULL
2221                          && intf2->altsetting != NULL
2222                          && intf2->altsetting->desc.bInterfaceClass ==
2223                                          USB_CLASS_AUDIO) {
2224                                 gspca_dev->audio = 1;
2225                                 break;
2226                         }
2227                 }
2228         }
2229
2230         gspca_dev->v4l2_dev.release = gspca_release;
2231         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2232         if (ret)
2233                 goto out;
2234         gspca_dev->sd_desc = sd_desc;
2235         gspca_dev->nbufread = 2;
2236         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2237         gspca_dev->vdev = gspca_template;
2238         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2239         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2240         set_bit(V4L2_FL_USE_FH_PRIO, &gspca_dev->vdev.flags);
2241         gspca_dev->module = module;
2242         gspca_dev->present = 1;
2243
2244         mutex_init(&gspca_dev->usb_lock);
2245         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2246         mutex_init(&gspca_dev->queue_lock);
2247         init_waitqueue_head(&gspca_dev->wq);
2248
2249         /* configure the subdriver and initialize the USB device */
2250         ret = sd_desc->config(gspca_dev, id);
2251         if (ret < 0)
2252                 goto out;
2253         if (gspca_dev->cam.ctrls != NULL)
2254                 ctrls_init(gspca_dev);
2255         ret = sd_desc->init(gspca_dev);
2256         if (ret < 0)
2257                 goto out;
2258         if (sd_desc->init_controls)
2259                 ret = sd_desc->init_controls(gspca_dev);
2260         if (ret < 0)
2261                 goto out;
2262         gspca_set_default_mode(gspca_dev);
2263
2264         ret = gspca_input_connect(gspca_dev);
2265         if (ret)
2266                 goto out;
2267
2268         /*
2269          * Don't take usb_lock for these ioctls. This improves latency if
2270          * usb_lock is taken for a long time, e.g. when changing a control
2271          * value, and a new frame is ready to be dequeued.
2272          */
2273         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2274         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2275         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2276         if (!gspca_dev->sd_desc->get_chip_ident)
2277                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_CHIP_IDENT);
2278 #ifdef CONFIG_VIDEO_ADV_DEBUG
2279         if (!gspca_dev->sd_desc->get_chip_ident ||
2280             !gspca_dev->sd_desc->get_register)
2281                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2282         if (!gspca_dev->sd_desc->get_chip_ident ||
2283             !gspca_dev->sd_desc->set_register)
2284                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2285 #endif
2286         if (!gspca_dev->sd_desc->get_jcomp)
2287                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2288         if (!gspca_dev->sd_desc->set_jcomp)
2289                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2290
2291         /* init video stuff */
2292         ret = video_register_device(&gspca_dev->vdev,
2293                                   VFL_TYPE_GRABBER,
2294                                   -1);
2295         if (ret < 0) {
2296                 pr_err("video_register_device err %d\n", ret);
2297                 goto out;
2298         }
2299
2300         usb_set_intfdata(intf, gspca_dev);
2301         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2302
2303         gspca_input_create_urb(gspca_dev);
2304
2305         return 0;
2306 out:
2307 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2308         if (gspca_dev->input_dev)
2309                 input_unregister_device(gspca_dev->input_dev);
2310 #endif
2311         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2312         kfree(gspca_dev->usb_buf);
2313         kfree(gspca_dev);
2314         return ret;
2315 }
2316 EXPORT_SYMBOL(gspca_dev_probe2);
2317
2318 /* same function as the previous one, but check the interface */
2319 int gspca_dev_probe(struct usb_interface *intf,
2320                 const struct usb_device_id *id,
2321                 const struct sd_desc *sd_desc,
2322                 int dev_size,
2323                 struct module *module)
2324 {
2325         struct usb_device *dev = interface_to_usbdev(intf);
2326
2327         /* we don't handle multi-config cameras */
2328         if (dev->descriptor.bNumConfigurations != 1) {
2329                 pr_err("%04x:%04x too many config\n",
2330                        id->idVendor, id->idProduct);
2331                 return -ENODEV;
2332         }
2333
2334         /* the USB video interface must be the first one */
2335         if (dev->actconfig->desc.bNumInterfaces != 1
2336          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2337                 return -ENODEV;
2338
2339         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2340 }
2341 EXPORT_SYMBOL(gspca_dev_probe);
2342
2343 /*
2344  * USB disconnection
2345  *
2346  * This function must be called by the sub-driver
2347  * when the device disconnects, after the specific resources are freed.
2348  */
2349 void gspca_disconnect(struct usb_interface *intf)
2350 {
2351         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2352 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2353         struct input_dev *input_dev;
2354 #endif
2355
2356         PDEBUG(D_PROBE, "%s disconnect",
2357                 video_device_node_name(&gspca_dev->vdev));
2358
2359         mutex_lock(&gspca_dev->usb_lock);
2360
2361         gspca_dev->present = 0;
2362         destroy_urbs(gspca_dev);
2363
2364 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2365         gspca_input_destroy_urb(gspca_dev);
2366         input_dev = gspca_dev->input_dev;
2367         if (input_dev) {
2368                 gspca_dev->input_dev = NULL;
2369                 input_unregister_device(input_dev);
2370         }
2371 #endif
2372         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2373         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2374                 gspca_dev->sd_desc->stop0(gspca_dev);
2375         gspca_dev->streaming = 0;
2376         gspca_dev->dev = NULL;
2377         wake_up_interruptible(&gspca_dev->wq);
2378
2379         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2380         video_unregister_device(&gspca_dev->vdev);
2381
2382         mutex_unlock(&gspca_dev->usb_lock);
2383
2384         /* (this will call gspca_release() immediately or on last close) */
2385         v4l2_device_put(&gspca_dev->v4l2_dev);
2386 }
2387 EXPORT_SYMBOL(gspca_disconnect);
2388
2389 #ifdef CONFIG_PM
2390 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2391 {
2392         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2393
2394         if (!gspca_dev->streaming)
2395                 return 0;
2396         mutex_lock(&gspca_dev->usb_lock);
2397         gspca_dev->frozen = 1;          /* avoid urb error messages */
2398         gspca_dev->usb_err = 0;
2399         if (gspca_dev->sd_desc->stopN)
2400                 gspca_dev->sd_desc->stopN(gspca_dev);
2401         destroy_urbs(gspca_dev);
2402         gspca_input_destroy_urb(gspca_dev);
2403         gspca_set_alt0(gspca_dev);
2404         if (gspca_dev->sd_desc->stop0)
2405                 gspca_dev->sd_desc->stop0(gspca_dev);
2406         mutex_unlock(&gspca_dev->usb_lock);
2407         return 0;
2408 }
2409 EXPORT_SYMBOL(gspca_suspend);
2410
2411 int gspca_resume(struct usb_interface *intf)
2412 {
2413         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2414         int streaming, ret = 0;
2415
2416         mutex_lock(&gspca_dev->usb_lock);
2417         gspca_dev->frozen = 0;
2418         gspca_dev->usb_err = 0;
2419         gspca_dev->sd_desc->init(gspca_dev);
2420         gspca_input_create_urb(gspca_dev);
2421         /*
2422          * Most subdrivers send all ctrl values on sd_start and thus
2423          * only write to the device registers on s_ctrl when streaming ->
2424          * Clear streaming to avoid setting all ctrls twice.
2425          */
2426         streaming = gspca_dev->streaming;
2427         gspca_dev->streaming = 0;
2428         if (streaming)
2429                 ret = gspca_init_transfer(gspca_dev);
2430         mutex_unlock(&gspca_dev->usb_lock);
2431         return ret;
2432 }
2433 EXPORT_SYMBOL(gspca_resume);
2434 #endif
2435
2436 /* -- module insert / remove -- */
2437 static int __init gspca_init(void)
2438 {
2439         pr_info("v" GSPCA_VERSION " registered\n");
2440         return 0;
2441 }
2442 static void __exit gspca_exit(void)
2443 {
2444 }
2445
2446 module_init(gspca_init);
2447 module_exit(gspca_exit);
2448
2449 #ifdef GSPCA_DEBUG
2450 module_param_named(debug, gspca_debug, int, 0644);
2451 MODULE_PARM_DESC(debug,
2452                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2453                 " 0x08:stream 0x10:frame 0x20:packet"
2454                 " 0x0100: v4l2");
2455 #endif