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 IS_ENABLED(CONFIG_INPUT)
  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 int gspca_debug;
  64 EXPORT_SYMBOL(gspca_debug);
  65
  66 static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
  67                         __u32 pixfmt, int w, int h)
  68 {
  69         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  70                 PDEBUG(debug, "%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(debug, "%s 0x%08x %dx%d",
  79                         txt,
  80                         pixfmt,
  81                         w, h);
  82         }
  83 }
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if IS_ENABLED(CONFIG_INPUT)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PERR("Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PERR("URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         pr_err("Resubmit URB failed with error %i\n", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         pr_err("Input device registration failed with error %i\n",
 181                                err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
 205                 "buffer_len=%u, interval=%u",
 206                 ep->bEndpointAddress, buffer_len, interval);
 207
 208         dev = gspca_dev->dev;
 209
 210         urb = usb_alloc_urb(0, GFP_KERNEL);
 211         if (!urb) {
 212                 ret = -ENOMEM;
 213                 goto error;
 214         }
 215
 216         buffer = usb_alloc_coherent(dev, buffer_len,
 217                                 GFP_KERNEL, &urb->transfer_dma);
 218         if (!buffer) {
 219                 ret = -ENOMEM;
 220                 goto error_buffer;
 221         }
 222         usb_fill_int_urb(urb, dev,
 223                 usb_rcvintpipe(dev, ep->bEndpointAddress),
 224                 buffer, buffer_len,
 225                 int_irq, (void *)gspca_dev, interval);
 226         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PERR("submit int URB failed with error %i", ret);
 230                 goto error_submit;
 231         }
 232         gspca_dev->int_urb = urb;
 233         return ret;
 234
 235 error_submit:
 236         usb_free_coherent(dev,
 237                           urb->transfer_buffer_length,
 238                           urb->transfer_buffer,
 239                           urb->transfer_dma);
 240 error_buffer:
 241         usb_free_urb(urb);
 242 error:
 243         return ret;
 244 }
 245
 246 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 247 {
 248         struct usb_interface *intf;
 249         struct usb_host_interface *intf_desc;
 250         struct usb_endpoint_descriptor *ep;
 251         int i;
 252
 253         if (gspca_dev->sd_desc->int_pkt_scan)  {
 254                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 255                 intf_desc = intf->cur_altsetting;
 256                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 257                         ep = &intf_desc->endpoint[i].desc;
 258                         if (usb_endpoint_dir_in(ep) &&
 259                             usb_endpoint_xfer_int(ep)) {
 260
 261                                 alloc_and_submit_int_urb(gspca_dev, ep);
 262                                 break;
 263                         }
 264                 }
 265         }
 266 }
 267
 268 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 269 {
 270         struct urb *urb;
 271
 272         urb = gspca_dev->int_urb;
 273         if (urb) {
 274                 gspca_dev->int_urb = NULL;
 275                 usb_kill_urb(urb);
 276                 usb_free_coherent(gspca_dev->dev,
 277                                   urb->transfer_buffer_length,
 278                                   urb->transfer_buffer,
 279                                   urb->transfer_dma);
 280                 usb_free_urb(urb);
 281         }
 282 }
 283 #else
 284 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 285 {
 286 }
 287
 288 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 289 {
 290 }
 291
 292 static inline int gspca_input_connect(struct gspca_dev *dev)
 293 {
 294         return 0;
 295 }
 296 #endif
 297
 298 /*
 299  * fill a video frame from an URB and resubmit
 300  */
 301 static void fill_frame(struct gspca_dev *gspca_dev,
 302                         struct urb *urb)
 303 {
 304         u8 *data;               /* address of data in the iso message */
 305         int i, len, st;
 306         cam_pkt_op pkt_scan;
 307
 308         if (urb->status != 0) {
 309                 if (urb->status == -ESHUTDOWN)
 310                         return;         /* disconnection */
 311 #ifdef CONFIG_PM
 312                 if (gspca_dev->frozen)
 313                         return;
 314 #endif
 315                 PERR("urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321                 len = urb->iso_frame_desc[i].actual_length;
 322
 323                 /* check the packet status and length */
 324                 st = urb->iso_frame_desc[i].status;
 325                 if (st) {
 326                         pr_err("ISOC data error: [%d] len=%d, status=%d\n",
 327                                i, len, st);
 328                         gspca_dev->last_packet_type = DISCARD_PACKET;
 329                         continue;
 330                 }
 331                 if (len == 0) {
 332                         if (gspca_dev->empty_packet == 0)
 333                                 gspca_dev->empty_packet = 1;
 334                         continue;
 335                 }
 336
 337                 /* let the packet be analyzed by the subdriver */
 338                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 339                         i, urb->iso_frame_desc[i].offset, len);
 340                 data = (u8 *) urb->transfer_buffer
 341                                         + urb->iso_frame_desc[i].offset;
 342                 pkt_scan(gspca_dev, data, len);
 343         }
 344
 345 resubmit:
 346         /* resubmit the URB */
 347         st = usb_submit_urb(urb, GFP_ATOMIC);
 348         if (st < 0)
 349                 pr_err("usb_submit_urb() ret %d\n", st);
 350 }
 351
 352 /*
 353  * ISOC message interrupt from the USB device
 354  *
 355  * Analyse each packet and call the subdriver for copy to the frame buffer.
 356  */
 357 static void isoc_irq(struct urb *urb)
 358 {
 359         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 360
 361         PDEBUG(D_PACK, "isoc irq");
 362         if (!gspca_dev->streaming)
 363                 return;
 364         fill_frame(gspca_dev, urb);
 365 }
 366
 367 /*
 368  * bulk message interrupt from the USB device
 369  */
 370 static void bulk_irq(struct urb *urb)
 371 {
 372         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 373         int st;
 374
 375         PDEBUG(D_PACK, "bulk irq");
 376         if (!gspca_dev->streaming)
 377                 return;
 378         switch (urb->status) {
 379         case 0:
 380                 break;
 381         case -ESHUTDOWN:
 382                 return;         /* disconnection */
 383         default:
 384 #ifdef CONFIG_PM
 385                 if (gspca_dev->frozen)
 386                         return;
 387 #endif
 388                 PERR("urb status: %d", urb->status);
 389                 urb->status = 0;
 390                 goto resubmit;
 391         }
 392
 393         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 394         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 395                                 urb->transfer_buffer,
 396                                 urb->actual_length);
 397
 398 resubmit:
 399         /* resubmit the URB */
 400         if (gspca_dev->cam.bulk_nurbs != 0) {
 401                 st = usb_submit_urb(urb, GFP_ATOMIC);
 402                 if (st < 0)
 403                         pr_err("usb_submit_urb() ret %d\n", st);
 404         }
 405 }
 406
 407 /*
 408  * add data to the current frame
 409  *
 410  * This function is called by the subdrivers at interrupt level.
 411  *
 412  * To build a frame, these ones must add
 413  *      - one FIRST_PACKET
 414  *      - 0 or many INTER_PACKETs
 415  *      - one LAST_PACKET
 416  * DISCARD_PACKET invalidates the whole frame.
 417  */
 418 void gspca_frame_add(struct gspca_dev *gspca_dev,
 419                         enum gspca_packet_type packet_type,
 420                         const u8 *data,
 421                         int len)
 422 {
 423         struct gspca_frame *frame;
 424         int i, j;
 425
 426         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 427
 428         if (packet_type == FIRST_PACKET) {
 429                 i = atomic_read(&gspca_dev->fr_i);
 430
 431                 /* if there are no queued buffer, discard the whole frame */
 432                 if (i == atomic_read(&gspca_dev->fr_q)) {
 433                         gspca_dev->last_packet_type = DISCARD_PACKET;
 434                         gspca_dev->sequence++;
 435                         return;
 436                 }
 437                 j = gspca_dev->fr_queue[i];
 438                 frame = &gspca_dev->frame[j];
 439                 v4l2_get_timestamp(&frame->v4l2_buf.timestamp);
 440                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 441                 gspca_dev->image = frame->data;
 442                 gspca_dev->image_len = 0;
 443         } else {
 444                 switch (gspca_dev->last_packet_type) {
 445                 case DISCARD_PACKET:
 446                         if (packet_type == LAST_PACKET) {
 447                                 gspca_dev->last_packet_type = packet_type;
 448                                 gspca_dev->image = NULL;
 449                                 gspca_dev->image_len = 0;
 450                         }
 451                         return;
 452                 case LAST_PACKET:
 453                         return;
 454                 }
 455         }
 456
 457         /* append the packet to the frame buffer */
 458         if (len > 0) {
 459                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 460                         PERR("frame overflow %d > %d",
 461                                 gspca_dev->image_len + len,
 462                                 gspca_dev->frsz);
 463                         packet_type = DISCARD_PACKET;
 464                 } else {
 465 /* !! image is NULL only when last pkt is LAST or DISCARD
 466                         if (gspca_dev->image == NULL) {
 467                                 pr_err("gspca_frame_add() image == NULL\n");
 468                                 return;
 469                         }
 470  */
 471                         memcpy(gspca_dev->image + gspca_dev->image_len,
 472                                 data, len);
 473                         gspca_dev->image_len += len;
 474                 }
 475         }
 476         gspca_dev->last_packet_type = packet_type;
 477
 478         /* if last packet, invalidate packet concatenation until
 479          * next first packet, wake up the application and advance
 480          * in the queue */
 481         if (packet_type == LAST_PACKET) {
 482                 i = atomic_read(&gspca_dev->fr_i);
 483                 j = gspca_dev->fr_queue[i];
 484                 frame = &gspca_dev->frame[j];
 485                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 486                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 487                                          | V4L2_BUF_FLAG_DONE)
 488                                         & ~V4L2_BUF_FLAG_QUEUED;
 489                 i = (i + 1) % GSPCA_MAX_FRAMES;
 490                 atomic_set(&gspca_dev->fr_i, i);
 491                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 492                 PDEBUG(D_FRAM, "frame complete len:%d",
 493                         frame->v4l2_buf.bytesused);
 494                 gspca_dev->image = NULL;
 495                 gspca_dev->image_len = 0;
 496         }
 497 }
 498 EXPORT_SYMBOL(gspca_frame_add);
 499
 500 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 501                         enum v4l2_memory memory, unsigned int count)
 502 {
 503         struct gspca_frame *frame;
 504         unsigned int frsz;
 505         int i;
 506
 507         frsz = gspca_dev->pixfmt.sizeimage;
 508         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 509         frsz = PAGE_ALIGN(frsz);
 510         if (count >= GSPCA_MAX_FRAMES)
 511                 count = GSPCA_MAX_FRAMES - 1;
 512         gspca_dev->frbuf = vmalloc_32(frsz * count);
 513         if (!gspca_dev->frbuf) {
 514                 pr_err("frame alloc failed\n");
 515                 return -ENOMEM;
 516         }
 517         gspca_dev->capt_file = file;
 518         gspca_dev->memory = memory;
 519         gspca_dev->frsz = frsz;
 520         gspca_dev->nframes = count;
 521         for (i = 0; i < count; i++) {
 522                 frame = &gspca_dev->frame[i];
 523                 frame->v4l2_buf.index = i;
 524                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 525                 frame->v4l2_buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 526                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 527                 frame->v4l2_buf.length = frsz;
 528                 frame->v4l2_buf.memory = memory;
 529                 frame->v4l2_buf.sequence = 0;
 530                 frame->data = gspca_dev->frbuf + i * frsz;
 531                 frame->v4l2_buf.m.offset = i * frsz;
 532         }
 533         atomic_set(&gspca_dev->fr_q, 0);
 534         atomic_set(&gspca_dev->fr_i, 0);
 535         gspca_dev->fr_o = 0;
 536         return 0;
 537 }
 538
 539 static void frame_free(struct gspca_dev *gspca_dev)
 540 {
 541         int i;
 542
 543         PDEBUG(D_STREAM, "frame free");
 544         if (gspca_dev->frbuf != NULL) {
 545                 vfree(gspca_dev->frbuf);
 546                 gspca_dev->frbuf = NULL;
 547                 for (i = 0; i < gspca_dev->nframes; i++)
 548                         gspca_dev->frame[i].data = NULL;
 549         }
 550         gspca_dev->nframes = 0;
 551         gspca_dev->frsz = 0;
 552         gspca_dev->capt_file = NULL;
 553         gspca_dev->memory = GSPCA_MEMORY_NO;
 554 }
 555
 556 static void destroy_urbs(struct gspca_dev *gspca_dev)
 557 {
 558         struct urb *urb;
 559         unsigned int i;
 560
 561         PDEBUG(D_STREAM, "kill transfer");
 562         for (i = 0; i < MAX_NURBS; i++) {
 563                 urb = gspca_dev->urb[i];
 564                 if (urb == NULL)
 565                         break;
 566
 567                 gspca_dev->urb[i] = NULL;
 568                 usb_kill_urb(urb);
 569                 usb_free_coherent(gspca_dev->dev,
 570                                   urb->transfer_buffer_length,
 571                                   urb->transfer_buffer,
 572                                   urb->transfer_dma);
 573                 usb_free_urb(urb);
 574         }
 575 }
 576
 577 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 578 {
 579         int ret;
 580
 581         if (gspca_dev->alt == 0)
 582                 return 0;
 583         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 584         if (ret < 0)
 585                 pr_err("set alt 0 err %d\n", ret);
 586         return ret;
 587 }
 588
 589 /* Note: both the queue and the usb locks should be held when calling this */
 590 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 591 {
 592         gspca_dev->streaming = 0;
 593         gspca_dev->usb_err = 0;
 594         if (gspca_dev->sd_desc->stopN)
 595                 gspca_dev->sd_desc->stopN(gspca_dev);
 596         destroy_urbs(gspca_dev);
 597         gspca_input_destroy_urb(gspca_dev);
 598         gspca_set_alt0(gspca_dev);
 599         gspca_input_create_urb(gspca_dev);
 600         if (gspca_dev->sd_desc->stop0)
 601                 gspca_dev->sd_desc->stop0(gspca_dev);
 602         PDEBUG(D_STREAM, "stream off OK");
 603 }
 604
 605 /*
 606  * look for an input transfer endpoint in an alternate setting.
 607  *
 608  * If xfer_ep is invalid, return the first valid ep found, otherwise
 609  * look for exactly the ep with address equal to xfer_ep.
 610  */
 611 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 612                                           int xfer, int xfer_ep)
 613 {
 614         struct usb_host_endpoint *ep;
 615         int i, attr;
 616
 617         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 618                 ep = &alt->endpoint[i];
 619                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 620                 if (attr == xfer
 621                     && ep->desc.wMaxPacketSize != 0
 622                     && usb_endpoint_dir_in(&ep->desc)
 623                     && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
 624                         return ep;
 625         }
 626         return NULL;
 627 }
 628
 629 /* compute the minimum bandwidth for the current transfer */
 630 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 631 {
 632         u32 bandwidth;
 633
 634         /* get the (max) image size */
 635         bandwidth = gspca_dev->pixfmt.sizeimage;
 636
 637         /* if the image is compressed, estimate its mean size */
 638         if (!gspca_dev->cam.needs_full_bandwidth &&
 639             bandwidth < gspca_dev->pixfmt.width *
 640                                 gspca_dev->pixfmt.height)
 641                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
 642
 643         /* estimate the frame rate */
 644         if (gspca_dev->sd_desc->get_streamparm) {
 645                 struct v4l2_streamparm parm;
 646
 647                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 648                 bandwidth *= parm.parm.capture.timeperframe.denominator;
 649                 bandwidth /= parm.parm.capture.timeperframe.numerator;
 650         } else {
 651
 652                 /* don't hope more than 15 fps with USB 1.1 and
 653                  * image resolution >= 640x480 */
 654                 if (gspca_dev->pixfmt.width >= 640
 655                  && gspca_dev->dev->speed == USB_SPEED_FULL)
 656                         bandwidth *= 15;                /* 15 fps */
 657                 else
 658                         bandwidth *= 30;                /* 30 fps */
 659         }
 660
 661         PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
 662         return bandwidth;
 663 }
 664
 665 /* endpoint table */
 666 #define MAX_ALT 16
 667 struct ep_tb_s {
 668         u32 alt;
 669         u32 bandwidth;
 670 };
 671
 672 /*
 673  * build the table of the endpoints
 674  * and compute the minimum bandwidth for the image transfer
 675  */
 676 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 677                         struct usb_interface *intf,
 678                         struct ep_tb_s *ep_tb)
 679 {
 680         struct usb_host_endpoint *ep;
 681         int i, j, nbalt, psize, found;
 682         u32 bandwidth, last_bw;
 683
 684         nbalt = intf->num_altsetting;
 685         if (nbalt > MAX_ALT)
 686                 nbalt = MAX_ALT;        /* fixme: should warn */
 687
 688         /* build the endpoint table */
 689         i = 0;
 690         last_bw = 0;
 691         for (;;) {
 692                 ep_tb->bandwidth = 2000 * 2000 * 120;
 693                 found = 0;
 694                 for (j = 0; j < nbalt; j++) {
 695                         ep = alt_xfer(&intf->altsetting[j],
 696                                       USB_ENDPOINT_XFER_ISOC,
 697                                       gspca_dev->xfer_ep);
 698                         if (ep == NULL)
 699                                 continue;
 700                         if (ep->desc.bInterval == 0) {
 701                                 pr_err("alt %d iso endp with 0 interval\n", j);
 702                                 continue;
 703                         }
 704                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 705                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 706                         bandwidth = psize * 1000;
 707                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
 708                          || gspca_dev->dev->speed >= USB_SPEED_SUPER)
 709                                 bandwidth *= 8;
 710                         bandwidth /= 1 << (ep->desc.bInterval - 1);
 711                         if (bandwidth <= last_bw)
 712                                 continue;
 713                         if (bandwidth < ep_tb->bandwidth) {
 714                                 ep_tb->bandwidth = bandwidth;
 715                                 ep_tb->alt = j;
 716                                 found = 1;
 717                         }
 718                 }
 719                 if (!found)
 720                         break;
 721                 PDEBUG(D_STREAM, "alt %d bandwidth %d",
 722                                 ep_tb->alt, ep_tb->bandwidth);
 723                 last_bw = ep_tb->bandwidth;
 724                 i++;
 725                 ep_tb++;
 726         }
 727
 728         /*
 729          * If the camera:
 730          * has a usb audio class interface (a built in usb mic); and
 731          * is a usb 1 full speed device; and
 732          * uses the max full speed iso bandwidth; and
 733          * and has more than 1 alt setting
 734          * then skip the highest alt setting to spare bandwidth for the mic
 735          */
 736         if (gspca_dev->audio &&
 737                         gspca_dev->dev->speed == USB_SPEED_FULL &&
 738                         last_bw >= 1000000 &&
 739                         i > 1) {
 740                 PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
 741                 i--;
 742                 ep_tb--;
 743         }
 744
 745         /* get the requested bandwidth and start at the highest atlsetting */
 746         bandwidth = which_bandwidth(gspca_dev);
 747         ep_tb--;
 748         while (i > 1) {
 749                 ep_tb--;
 750                 if (ep_tb->bandwidth < bandwidth)
 751                         break;
 752                 i--;
 753         }
 754         return i;
 755 }
 756
 757 /*
 758  * create the URBs for image transfer
 759  */
 760 static int create_urbs(struct gspca_dev *gspca_dev,
 761                         struct usb_host_endpoint *ep)
 762 {
 763         struct urb *urb;
 764         int n, nurbs, i, psize, npkt, bsize;
 765
 766         /* calculate the packet size and the number of packets */
 767         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 768
 769         if (!gspca_dev->cam.bulk) {             /* isoc */
 770
 771                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 772                 if (gspca_dev->pkt_size == 0)
 773                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 774                 else
 775                         psize = gspca_dev->pkt_size;
 776                 npkt = gspca_dev->cam.npkt;
 777                 if (npkt == 0)
 778                         npkt = 32;              /* default value */
 779                 bsize = psize * npkt;
 780                 PDEBUG(D_STREAM,
 781                         "isoc %d pkts size %d = bsize:%d",
 782                         npkt, psize, bsize);
 783                 nurbs = DEF_NURBS;
 784         } else {                                /* bulk */
 785                 npkt = 0;
 786                 bsize = gspca_dev->cam.bulk_size;
 787                 if (bsize == 0)
 788                         bsize = psize;
 789                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 790                 if (gspca_dev->cam.bulk_nurbs != 0)
 791                         nurbs = gspca_dev->cam.bulk_nurbs;
 792                 else
 793                         nurbs = 1;
 794         }
 795
 796         for (n = 0; n < nurbs; n++) {
 797                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 798                 if (!urb)
 799                         return -ENOMEM;
 800                 gspca_dev->urb[n] = urb;
 801                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 802                                                 bsize,
 803                                                 GFP_KERNEL,
 804                                                 &urb->transfer_dma);
 805
 806                 if (urb->transfer_buffer == NULL) {
 807                         pr_err("usb_alloc_coherent failed\n");
 808                         return -ENOMEM;
 809                 }
 810                 urb->dev = gspca_dev->dev;
 811                 urb->context = gspca_dev;
 812                 urb->transfer_buffer_length = bsize;
 813                 if (npkt != 0) {                /* ISOC */
 814                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 815                                                     ep->desc.bEndpointAddress);
 816                         urb->transfer_flags = URB_ISO_ASAP
 817                                         | URB_NO_TRANSFER_DMA_MAP;
 818                         urb->interval = 1 << (ep->desc.bInterval - 1);
 819                         urb->complete = isoc_irq;
 820                         urb->number_of_packets = npkt;
 821                         for (i = 0; i < npkt; i++) {
 822                                 urb->iso_frame_desc[i].length = psize;
 823                                 urb->iso_frame_desc[i].offset = psize * i;
 824                         }
 825                 } else {                /* bulk */
 826                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 827                                                 ep->desc.bEndpointAddress);
 828                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 829                         urb->complete = bulk_irq;
 830                 }
 831         }
 832         return 0;
 833 }
 834
 835 /*
 836  * start the USB transfer
 837  */
 838 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 839 {
 840         struct usb_interface *intf;
 841         struct usb_host_endpoint *ep;
 842         struct urb *urb;
 843         struct ep_tb_s ep_tb[MAX_ALT];
 844         int n, ret, xfer, alt, alt_idx;
 845
 846         /* reset the streaming variables */
 847         gspca_dev->image = NULL;
 848         gspca_dev->image_len = 0;
 849         gspca_dev->last_packet_type = DISCARD_PACKET;
 850         gspca_dev->sequence = 0;
 851
 852         gspca_dev->usb_err = 0;
 853
 854         /* do the specific subdriver stuff before endpoint selection */
 855         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 856         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 857         if (gspca_dev->sd_desc->isoc_init) {
 858                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 859                 if (ret < 0)
 860                         return ret;
 861         }
 862         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 863                                    : USB_ENDPOINT_XFER_ISOC;
 864
 865         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 866         if (gspca_dev->alt != 0) {
 867                 gspca_dev->alt--;       /* (previous version compatibility) */
 868                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
 869                               gspca_dev->xfer_ep);
 870                 if (ep == NULL) {
 871                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 872                         return -EIO;
 873                 }
 874                 ep_tb[0].alt = gspca_dev->alt;
 875                 alt_idx = 1;
 876         } else {
 877                 /* else, compute the minimum bandwidth
 878                  * and build the endpoint table */
 879                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 880                 if (alt_idx <= 0) {
 881                         pr_err("no transfer endpoint found\n");
 882                         return -EIO;
 883                 }
 884         }
 885
 886         /* set the highest alternate setting and
 887          * loop until urb submit succeeds */
 888         gspca_input_destroy_urb(gspca_dev);
 889
 890         gspca_dev->alt = ep_tb[--alt_idx].alt;
 891         alt = -1;
 892         for (;;) {
 893                 if (alt != gspca_dev->alt) {
 894                         alt = gspca_dev->alt;
 895                         if (intf->num_altsetting > 1) {
 896                                 ret = usb_set_interface(gspca_dev->dev,
 897                                                         gspca_dev->iface,
 898                                                         alt);
 899                                 if (ret < 0) {
 900                                         if (ret == -ENOSPC)
 901                                                 goto retry; /*fixme: ugly*/
 902                                         pr_err("set alt %d err %d\n", alt, ret);
 903                                         goto out;
 904                                 }
 905                         }
 906                 }
 907                 if (!gspca_dev->cam.no_urb_create) {
 908                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 909                         ret = create_urbs(gspca_dev,
 910                                 alt_xfer(&intf->altsetting[alt], xfer,
 911                                          gspca_dev->xfer_ep));
 912                         if (ret < 0) {
 913                                 destroy_urbs(gspca_dev);
 914                                 goto out;
 915                         }
 916                 }
 917
 918                 /* clear the bulk endpoint */
 919                 if (gspca_dev->cam.bulk)
 920                         usb_clear_halt(gspca_dev->dev,
 921                                         gspca_dev->urb[0]->pipe);
 922
 923                 /* start the cam */
 924                 ret = gspca_dev->sd_desc->start(gspca_dev);
 925                 if (ret < 0) {
 926                         destroy_urbs(gspca_dev);
 927                         goto out;
 928                 }
 929                 gspca_dev->streaming = 1;
 930                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 931
 932                 /* some bulk transfers are started by the subdriver */
 933                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 934                         break;
 935
 936                 /* submit the URBs */
 937                 for (n = 0; n < MAX_NURBS; n++) {
 938                         urb = gspca_dev->urb[n];
 939                         if (urb == NULL)
 940                                 break;
 941                         ret = usb_submit_urb(urb, GFP_KERNEL);
 942                         if (ret < 0)
 943                                 break;
 944                 }
 945                 if (ret >= 0)
 946                         break;                  /* transfer is started */
 947
 948                 /* something when wrong
 949                  * stop the webcam and free the transfer resources */
 950                 gspca_stream_off(gspca_dev);
 951                 if (ret != -ENOSPC) {
 952                         pr_err("usb_submit_urb alt %d err %d\n",
 953                                gspca_dev->alt, ret);
 954                         goto out;
 955                 }
 956
 957                 /* the bandwidth is not wide enough
 958                  * negotiate or try a lower alternate setting */
 959 retry:
 960                 PERR("alt %d - bandwidth not wide enough, trying again", alt);
 961                 msleep(20);     /* wait for kill complete */
 962                 if (gspca_dev->sd_desc->isoc_nego) {
 963                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 964                         if (ret < 0)
 965                                 goto out;
 966                 } else {
 967                         if (alt_idx <= 0) {
 968                                 pr_err("no transfer endpoint found\n");
 969                                 ret = -EIO;
 970                                 goto out;
 971                         }
 972                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 973                 }
 974         }
 975 out:
 976         gspca_input_create_urb(gspca_dev);
 977         return ret;
 978 }
 979
 980 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 981 {
 982         int i;
 983
 984         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 985         gspca_dev->curr_mode = i;
 986         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 987
 988         /* does nothing if ctrl_handler == NULL */
 989         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 990 }
 991
 992 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 993                         int width, int height)
 994 {
 995         int i;
 996
 997         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 998                 if (width == gspca_dev->cam.cam_mode[i].width
 999                     && height == gspca_dev->cam.cam_mode[i].height)
1000                         return i;
1001         }
1002         return -EINVAL;
1003 }
1004
1005 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
1006                         int width, int height)
1007 {
1008         int i;
1009
1010         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1011                 if (width >= gspca_dev->cam.cam_mode[i].width
1012                     && height >= gspca_dev->cam.cam_mode[i].height)
1013                         break;
1014         }
1015         return i;
1016 }
1017
1018 /*
1019  * search a mode with the right pixel format
1020  */
1021 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1022                         int mode,
1023                         int pixfmt)
1024 {
1025         int modeU, modeD;
1026
1027         modeU = modeD = mode;
1028         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1029                 if (--modeD >= 0) {
1030                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1031                                                                 == pixfmt)
1032                                 return modeD;
1033                 }
1034                 if (++modeU < gspca_dev->cam.nmodes) {
1035                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1036                                                                 == pixfmt)
1037                                 return modeU;
1038                 }
1039         }
1040         return -EINVAL;
1041 }
1042
1043 #ifdef CONFIG_VIDEO_ADV_DEBUG
1044 static int vidioc_g_chip_info(struct file *file, void *priv,
1045                                 struct v4l2_dbg_chip_info *chip)
1046 {
1047         struct gspca_dev *gspca_dev = video_drvdata(file);
1048
1049         gspca_dev->usb_err = 0;
1050         if (gspca_dev->sd_desc->get_chip_info)
1051                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1052         return chip->match.addr ? -EINVAL : 0;
1053 }
1054
1055 static int vidioc_g_register(struct file *file, void *priv,
1056                 struct v4l2_dbg_register *reg)
1057 {
1058         struct gspca_dev *gspca_dev = video_drvdata(file);
1059
1060         gspca_dev->usb_err = 0;
1061         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1062 }
1063
1064 static int vidioc_s_register(struct file *file, void *priv,
1065                 const struct v4l2_dbg_register *reg)
1066 {
1067         struct gspca_dev *gspca_dev = video_drvdata(file);
1068
1069         gspca_dev->usb_err = 0;
1070         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1071 }
1072 #endif
1073
1074 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1075                                 struct v4l2_fmtdesc *fmtdesc)
1076 {
1077         struct gspca_dev *gspca_dev = video_drvdata(file);
1078         int i, j, index;
1079         __u32 fmt_tb[8];
1080
1081         /* give an index to each format */
1082         index = 0;
1083         j = 0;
1084         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1085                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1086                 j = 0;
1087                 for (;;) {
1088                         if (fmt_tb[j] == fmt_tb[index])
1089                                 break;
1090                         j++;
1091                 }
1092                 if (j == index) {
1093                         if (fmtdesc->index == index)
1094                                 break;          /* new format */
1095                         index++;
1096                         if (index >= ARRAY_SIZE(fmt_tb))
1097                                 return -EINVAL;
1098                 }
1099         }
1100         if (i < 0)
1101                 return -EINVAL;         /* no more format */
1102
1103         fmtdesc->pixelformat = fmt_tb[index];
1104         if (gspca_dev->cam.cam_mode[i].sizeimage <
1105                         gspca_dev->cam.cam_mode[i].width *
1106                                 gspca_dev->cam.cam_mode[i].height)
1107                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1108         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1109         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1110         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1111         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1112         fmtdesc->description[4] = '\0';
1113         return 0;
1114 }
1115
1116 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1117                             struct v4l2_format *fmt)
1118 {
1119         struct gspca_dev *gspca_dev = video_drvdata(file);
1120
1121         fmt->fmt.pix = gspca_dev->pixfmt;
1122         /* some drivers use priv internally, zero it before giving it back to
1123            the core */
1124         fmt->fmt.pix.priv = 0;
1125         return 0;
1126 }
1127
1128 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1129                         struct v4l2_format *fmt)
1130 {
1131         int w, h, mode, mode2;
1132
1133         w = fmt->fmt.pix.width;
1134         h = fmt->fmt.pix.height;
1135
1136         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1137                     fmt->fmt.pix.pixelformat, w, h);
1138
1139         /* search the nearest mode for width and height */
1140         mode = wxh_to_nearest_mode(gspca_dev, w, h);
1141
1142         /* OK if right palette */
1143         if (gspca_dev->cam.cam_mode[mode].pixelformat
1144                                                 != fmt->fmt.pix.pixelformat) {
1145
1146                 /* else, search the closest mode with the same pixel format */
1147                 mode2 = gspca_get_mode(gspca_dev, mode,
1148                                         fmt->fmt.pix.pixelformat);
1149                 if (mode2 >= 0)
1150                         mode = mode2;
1151         }
1152         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1153         if (gspca_dev->sd_desc->try_fmt) {
1154                 /* pass original resolution to subdriver try_fmt */
1155                 fmt->fmt.pix.width = w;
1156                 fmt->fmt.pix.height = h;
1157                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1158         }
1159         /* some drivers use priv internally, zero it before giving it back to
1160            the core */
1161         fmt->fmt.pix.priv = 0;
1162         return mode;                    /* used when s_fmt */
1163 }
1164
1165 static int vidioc_try_fmt_vid_cap(struct file *file,
1166                               void *priv,
1167                               struct v4l2_format *fmt)
1168 {
1169         struct gspca_dev *gspca_dev = video_drvdata(file);
1170         int ret;
1171
1172         ret = try_fmt_vid_cap(gspca_dev, fmt);
1173         if (ret < 0)
1174                 return ret;
1175         return 0;
1176 }
1177
1178 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1179                             struct v4l2_format *fmt)
1180 {
1181         struct gspca_dev *gspca_dev = video_drvdata(file);
1182         int ret;
1183
1184         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1185                 return -ERESTARTSYS;
1186
1187         ret = try_fmt_vid_cap(gspca_dev, fmt);
1188         if (ret < 0)
1189                 goto out;
1190
1191         if (gspca_dev->nframes != 0
1192             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1193                 ret = -EINVAL;
1194                 goto out;
1195         }
1196
1197         if (gspca_dev->streaming) {
1198                 ret = -EBUSY;
1199                 goto out;
1200         }
1201         gspca_dev->curr_mode = ret;
1202         if (gspca_dev->sd_desc->try_fmt)
1203                 /* subdriver try_fmt can modify format parameters */
1204                 gspca_dev->pixfmt = fmt->fmt.pix;
1205         else
1206                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1207
1208         ret = 0;
1209 out:
1210         mutex_unlock(&gspca_dev->queue_lock);
1211         return ret;
1212 }
1213
1214 static int vidioc_enum_framesizes(struct file *file, void *priv,
1215                                   struct v4l2_frmsizeenum *fsize)
1216 {
1217         struct gspca_dev *gspca_dev = video_drvdata(file);
1218         int i;
1219         __u32 index = 0;
1220
1221         if (gspca_dev->sd_desc->enum_framesizes)
1222                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1223
1224         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1225                 if (fsize->pixel_format !=
1226                                 gspca_dev->cam.cam_mode[i].pixelformat)
1227                         continue;
1228
1229                 if (fsize->index == index) {
1230                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1231                         fsize->discrete.width =
1232                                 gspca_dev->cam.cam_mode[i].width;
1233                         fsize->discrete.height =
1234                                 gspca_dev->cam.cam_mode[i].height;
1235                         return 0;
1236                 }
1237                 index++;
1238         }
1239
1240         return -EINVAL;
1241 }
1242
1243 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1244                                       struct v4l2_frmivalenum *fival)
1245 {
1246         struct gspca_dev *gspca_dev = video_drvdata(filp);
1247         int mode;
1248         __u32 i;
1249
1250         mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1251         if (mode < 0)
1252                 return -EINVAL;
1253
1254         if (gspca_dev->cam.mode_framerates == NULL ||
1255                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1256                 return -EINVAL;
1257
1258         if (fival->pixel_format !=
1259                         gspca_dev->cam.cam_mode[mode].pixelformat)
1260                 return -EINVAL;
1261
1262         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1263                 if (fival->index == i) {
1264                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1265                         fival->discrete.numerator = 1;
1266                         fival->discrete.denominator =
1267                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1268                         return 0;
1269                 }
1270         }
1271
1272         return -EINVAL;
1273 }
1274
1275 static void gspca_release(struct v4l2_device *v4l2_device)
1276 {
1277         struct gspca_dev *gspca_dev =
1278                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1279
1280         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1281         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1282         kfree(gspca_dev->usb_buf);
1283         kfree(gspca_dev);
1284 }
1285
1286 static int dev_open(struct file *file)
1287 {
1288         struct gspca_dev *gspca_dev = video_drvdata(file);
1289         int ret;
1290
1291         PDEBUG(D_STREAM, "[%s] open", current->comm);
1292
1293         /* protect the subdriver against rmmod */
1294         if (!try_module_get(gspca_dev->module))
1295                 return -ENODEV;
1296
1297         ret = v4l2_fh_open(file);
1298         if (ret)
1299                 module_put(gspca_dev->module);
1300         return ret;
1301 }
1302
1303 static int dev_close(struct file *file)
1304 {
1305         struct gspca_dev *gspca_dev = video_drvdata(file);
1306
1307         PDEBUG(D_STREAM, "[%s] close", current->comm);
1308
1309         /* Needed for gspca_stream_off, always lock before queue_lock! */
1310         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1311                 return -ERESTARTSYS;
1312
1313         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1314                 mutex_unlock(&gspca_dev->usb_lock);
1315                 return -ERESTARTSYS;
1316         }
1317
1318         /* if the file did the capture, free the streaming resources */
1319         if (gspca_dev->capt_file == file) {
1320                 if (gspca_dev->streaming)
1321                         gspca_stream_off(gspca_dev);
1322                 frame_free(gspca_dev);
1323         }
1324         module_put(gspca_dev->module);
1325         mutex_unlock(&gspca_dev->queue_lock);
1326         mutex_unlock(&gspca_dev->usb_lock);
1327
1328         PDEBUG(D_STREAM, "close done");
1329
1330         return v4l2_fh_release(file);
1331 }
1332
1333 static int vidioc_querycap(struct file *file, void  *priv,
1334                            struct v4l2_capability *cap)
1335 {
1336         struct gspca_dev *gspca_dev = video_drvdata(file);
1337
1338         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1339                         sizeof cap->driver);
1340         if (gspca_dev->dev->product != NULL) {
1341                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1342                         sizeof cap->card);
1343         } else {
1344                 snprintf((char *) cap->card, sizeof cap->card,
1345                         "USB Camera (%04x:%04x)",
1346                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1347                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1348         }
1349         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1350                         sizeof(cap->bus_info));
1351         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1352                           | V4L2_CAP_STREAMING
1353                           | V4L2_CAP_READWRITE;
1354         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1355         return 0;
1356 }
1357
1358 static int vidioc_enum_input(struct file *file, void *priv,
1359                                 struct v4l2_input *input)
1360 {
1361         struct gspca_dev *gspca_dev = video_drvdata(file);
1362
1363         if (input->index != 0)
1364                 return -EINVAL;
1365         input->type = V4L2_INPUT_TYPE_CAMERA;
1366         input->status = gspca_dev->cam.input_flags;
1367         strlcpy(input->name, gspca_dev->sd_desc->name,
1368                 sizeof input->name);
1369         return 0;
1370 }
1371
1372 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1373 {
1374         *i = 0;
1375         return 0;
1376 }
1377
1378 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1379 {
1380         if (i > 0)
1381                 return -EINVAL;
1382         return (0);
1383 }
1384
1385 static int vidioc_reqbufs(struct file *file, void *priv,
1386                           struct v4l2_requestbuffers *rb)
1387 {
1388         struct gspca_dev *gspca_dev = video_drvdata(file);
1389         int i, ret = 0, streaming;
1390
1391         i = rb->memory;                 /* (avoid compilation warning) */
1392         switch (i) {
1393         case GSPCA_MEMORY_READ:                 /* (internal call) */
1394         case V4L2_MEMORY_MMAP:
1395         case V4L2_MEMORY_USERPTR:
1396                 break;
1397         default:
1398                 return -EINVAL;
1399         }
1400         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1401                 return -ERESTARTSYS;
1402
1403         if (gspca_dev->memory != GSPCA_MEMORY_NO
1404             && gspca_dev->memory != GSPCA_MEMORY_READ
1405             && gspca_dev->memory != rb->memory) {
1406                 ret = -EBUSY;
1407                 goto out;
1408         }
1409
1410         /* only one file may do the capture */
1411         if (gspca_dev->capt_file != NULL
1412             && gspca_dev->capt_file != file) {
1413                 ret = -EBUSY;
1414                 goto out;
1415         }
1416
1417         /* if allocated, the buffers must not be mapped */
1418         for (i = 0; i < gspca_dev->nframes; i++) {
1419                 if (gspca_dev->frame[i].vma_use_count) {
1420                         ret = -EBUSY;
1421                         goto out;
1422                 }
1423         }
1424
1425         /* stop streaming */
1426         streaming = gspca_dev->streaming;
1427         if (streaming) {
1428                 gspca_stream_off(gspca_dev);
1429
1430                 /* Don't restart the stream when switching from read
1431                  * to mmap mode */
1432                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1433                         streaming = 0;
1434         }
1435
1436         /* free the previous allocated buffers, if any */
1437         if (gspca_dev->nframes != 0)
1438                 frame_free(gspca_dev);
1439         if (rb->count == 0)                     /* unrequest */
1440                 goto out;
1441         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1442         if (ret == 0) {
1443                 rb->count = gspca_dev->nframes;
1444                 if (streaming)
1445                         ret = gspca_init_transfer(gspca_dev);
1446         }
1447 out:
1448         mutex_unlock(&gspca_dev->queue_lock);
1449         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1450         return ret;
1451 }
1452
1453 static int vidioc_querybuf(struct file *file, void *priv,
1454                            struct v4l2_buffer *v4l2_buf)
1455 {
1456         struct gspca_dev *gspca_dev = video_drvdata(file);
1457         struct gspca_frame *frame;
1458
1459         if (v4l2_buf->index >= gspca_dev->nframes)
1460                 return -EINVAL;
1461
1462         frame = &gspca_dev->frame[v4l2_buf->index];
1463         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1464         return 0;
1465 }
1466
1467 static int vidioc_streamon(struct file *file, void *priv,
1468                            enum v4l2_buf_type buf_type)
1469 {
1470         struct gspca_dev *gspca_dev = video_drvdata(file);
1471         int ret;
1472
1473         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1474                 return -EINVAL;
1475         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1476                 return -ERESTARTSYS;
1477
1478         /* check the capture file */
1479         if (gspca_dev->capt_file != file) {
1480                 ret = -EBUSY;
1481                 goto out;
1482         }
1483
1484         if (gspca_dev->nframes == 0
1485             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1486                 ret = -EINVAL;
1487                 goto out;
1488         }
1489         if (!gspca_dev->streaming) {
1490                 ret = gspca_init_transfer(gspca_dev);
1491                 if (ret < 0)
1492                         goto out;
1493         }
1494         PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1495                     gspca_dev->pixfmt.pixelformat,
1496                     gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1497         ret = 0;
1498 out:
1499         mutex_unlock(&gspca_dev->queue_lock);
1500         return ret;
1501 }
1502
1503 static int vidioc_streamoff(struct file *file, void *priv,
1504                                 enum v4l2_buf_type buf_type)
1505 {
1506         struct gspca_dev *gspca_dev = video_drvdata(file);
1507         int i, ret;
1508
1509         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1510                 return -EINVAL;
1511
1512         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1513                 return -ERESTARTSYS;
1514
1515         if (!gspca_dev->streaming) {
1516                 ret = 0;
1517                 goto out;
1518         }
1519
1520         /* check the capture file */
1521         if (gspca_dev->capt_file != file) {
1522                 ret = -EBUSY;
1523                 goto out;
1524         }
1525
1526         /* stop streaming */
1527         gspca_stream_off(gspca_dev);
1528         /* In case another thread is waiting in dqbuf */
1529         wake_up_interruptible(&gspca_dev->wq);
1530
1531         /* empty the transfer queues */
1532         for (i = 0; i < gspca_dev->nframes; i++)
1533                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1534         atomic_set(&gspca_dev->fr_q, 0);
1535         atomic_set(&gspca_dev->fr_i, 0);
1536         gspca_dev->fr_o = 0;
1537         ret = 0;
1538 out:
1539         mutex_unlock(&gspca_dev->queue_lock);
1540         return ret;
1541 }
1542
1543 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1544                         struct v4l2_jpegcompression *jpegcomp)
1545 {
1546         struct gspca_dev *gspca_dev = video_drvdata(file);
1547
1548         gspca_dev->usb_err = 0;
1549         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1550 }
1551
1552 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1553                         const struct v4l2_jpegcompression *jpegcomp)
1554 {
1555         struct gspca_dev *gspca_dev = video_drvdata(file);
1556
1557         gspca_dev->usb_err = 0;
1558         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1559 }
1560
1561 static int vidioc_g_parm(struct file *filp, void *priv,
1562                         struct v4l2_streamparm *parm)
1563 {
1564         struct gspca_dev *gspca_dev = video_drvdata(filp);
1565
1566         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1567
1568         if (gspca_dev->sd_desc->get_streamparm) {
1569                 gspca_dev->usb_err = 0;
1570                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1571                 return gspca_dev->usb_err;
1572         }
1573         return 0;
1574 }
1575
1576 static int vidioc_s_parm(struct file *filp, void *priv,
1577                         struct v4l2_streamparm *parm)
1578 {
1579         struct gspca_dev *gspca_dev = video_drvdata(filp);
1580         unsigned int n;
1581
1582         n = parm->parm.capture.readbuffers;
1583         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1584                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1585         else
1586                 gspca_dev->nbufread = n;
1587
1588         if (gspca_dev->sd_desc->set_streamparm) {
1589                 gspca_dev->usb_err = 0;
1590                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1591                 return gspca_dev->usb_err;
1592         }
1593
1594         return 0;
1595 }
1596
1597 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1598 {
1599         struct gspca_dev *gspca_dev = video_drvdata(file);
1600         struct gspca_frame *frame;
1601         struct page *page;
1602         unsigned long addr, start, size;
1603         int i, ret;
1604
1605         start = vma->vm_start;
1606         size = vma->vm_end - vma->vm_start;
1607         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1608
1609         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1610                 return -ERESTARTSYS;
1611         if (gspca_dev->capt_file != file) {
1612                 ret = -EINVAL;
1613                 goto out;
1614         }
1615
1616         frame = NULL;
1617         for (i = 0; i < gspca_dev->nframes; ++i) {
1618                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1619                         PDEBUG(D_STREAM, "mmap bad memory type");
1620                         break;
1621                 }
1622                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1623                                                 == vma->vm_pgoff) {
1624                         frame = &gspca_dev->frame[i];
1625                         break;
1626                 }
1627         }
1628         if (frame == NULL) {
1629                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1630                 ret = -EINVAL;
1631                 goto out;
1632         }
1633         if (size != frame->v4l2_buf.length) {
1634                 PDEBUG(D_STREAM, "mmap bad size");
1635                 ret = -EINVAL;
1636                 goto out;
1637         }
1638
1639         /*
1640          * - VM_IO marks the area as being a mmaped region for I/O to a
1641          *   device. It also prevents the region from being core dumped.
1642          */
1643         vma->vm_flags |= VM_IO;
1644
1645         addr = (unsigned long) frame->data;
1646         while (size > 0) {
1647                 page = vmalloc_to_page((void *) addr);
1648                 ret = vm_insert_page(vma, start, page);
1649                 if (ret < 0)
1650                         goto out;
1651                 start += PAGE_SIZE;
1652                 addr += PAGE_SIZE;
1653                 size -= PAGE_SIZE;
1654         }
1655
1656         vma->vm_ops = &gspca_vm_ops;
1657         vma->vm_private_data = frame;
1658         gspca_vm_open(vma);
1659         ret = 0;
1660 out:
1661         mutex_unlock(&gspca_dev->queue_lock);
1662         return ret;
1663 }
1664
1665 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1666                                 enum v4l2_memory memory)
1667 {
1668         if (!gspca_dev->present)
1669                 return -ENODEV;
1670         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1671                         !gspca_dev->streaming)
1672                 return -EINVAL;
1673
1674         /* check if a frame is ready */
1675         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1676 }
1677
1678 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1679                         enum v4l2_memory memory)
1680 {
1681         int ret;
1682
1683         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1684                 return -ERESTARTSYS;
1685         ret = frame_ready_nolock(gspca_dev, file, memory);
1686         mutex_unlock(&gspca_dev->queue_lock);
1687         return ret;
1688 }
1689
1690 /*
1691  * dequeue a video buffer
1692  *
1693  * If nonblock_ing is false, block until a buffer is available.
1694  */
1695 static int vidioc_dqbuf(struct file *file, void *priv,
1696                         struct v4l2_buffer *v4l2_buf)
1697 {
1698         struct gspca_dev *gspca_dev = video_drvdata(file);
1699         struct gspca_frame *frame;
1700         int i, j, ret;
1701
1702         PDEBUG(D_FRAM, "dqbuf");
1703
1704         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1705                 return -ERESTARTSYS;
1706
1707         for (;;) {
1708                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1709                 if (ret < 0)
1710                         goto out;
1711                 if (ret > 0)
1712                         break;
1713
1714                 mutex_unlock(&gspca_dev->queue_lock);
1715
1716                 if (file->f_flags & O_NONBLOCK)
1717                         return -EAGAIN;
1718
1719                 /* wait till a frame is ready */
1720                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1721                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1722                         msecs_to_jiffies(3000));
1723                 if (ret < 0)
1724                         return ret;
1725                 if (ret == 0)
1726                         return -EIO;
1727
1728                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1729                         return -ERESTARTSYS;
1730         }
1731
1732         i = gspca_dev->fr_o;
1733         j = gspca_dev->fr_queue[i];
1734         frame = &gspca_dev->frame[j];
1735
1736         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1737
1738         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1739         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1740         PDEBUG(D_FRAM, "dqbuf %d", j);
1741         ret = 0;
1742
1743         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1744                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1745                                  frame->data,
1746                                  frame->v4l2_buf.bytesused)) {
1747                         PERR("dqbuf cp to user failed");
1748                         ret = -EFAULT;
1749                 }
1750         }
1751 out:
1752         mutex_unlock(&gspca_dev->queue_lock);
1753
1754         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1755                 mutex_lock(&gspca_dev->usb_lock);
1756                 gspca_dev->usb_err = 0;
1757                 if (gspca_dev->present)
1758                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1759                 mutex_unlock(&gspca_dev->usb_lock);
1760         }
1761
1762         return ret;
1763 }
1764
1765 /*
1766  * queue a video buffer
1767  *
1768  * Attempting to queue a buffer that has already been
1769  * queued will return -EINVAL.
1770  */
1771 static int vidioc_qbuf(struct file *file, void *priv,
1772                         struct v4l2_buffer *v4l2_buf)
1773 {
1774         struct gspca_dev *gspca_dev = video_drvdata(file);
1775         struct gspca_frame *frame;
1776         int i, index, ret;
1777
1778         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1779
1780         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1781                 return -ERESTARTSYS;
1782
1783         index = v4l2_buf->index;
1784         if ((unsigned) index >= gspca_dev->nframes) {
1785                 PDEBUG(D_FRAM,
1786                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1787                 ret = -EINVAL;
1788                 goto out;
1789         }
1790         if (v4l2_buf->memory != gspca_dev->memory) {
1791                 PDEBUG(D_FRAM, "qbuf bad memory type");
1792                 ret = -EINVAL;
1793                 goto out;
1794         }
1795
1796         frame = &gspca_dev->frame[index];
1797         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1798                 PDEBUG(D_FRAM, "qbuf bad state");
1799                 ret = -EINVAL;
1800                 goto out;
1801         }
1802
1803         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1804
1805         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1806                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1807                 frame->v4l2_buf.length = v4l2_buf->length;
1808         }
1809
1810         /* put the buffer in the 'queued' queue */
1811         i = atomic_read(&gspca_dev->fr_q);
1812         gspca_dev->fr_queue[i] = index;
1813         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1814
1815         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1816         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1817         ret = 0;
1818 out:
1819         mutex_unlock(&gspca_dev->queue_lock);
1820         return ret;
1821 }
1822
1823 /*
1824  * allocate the resources for read()
1825  */
1826 static int read_alloc(struct gspca_dev *gspca_dev,
1827                         struct file *file)
1828 {
1829         struct v4l2_buffer v4l2_buf;
1830         int i, ret;
1831
1832         PDEBUG(D_STREAM, "read alloc");
1833
1834         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1835                 return -ERESTARTSYS;
1836
1837         if (gspca_dev->nframes == 0) {
1838                 struct v4l2_requestbuffers rb;
1839
1840                 memset(&rb, 0, sizeof rb);
1841                 rb.count = gspca_dev->nbufread;
1842                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1843                 rb.memory = GSPCA_MEMORY_READ;
1844                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1845                 if (ret != 0) {
1846                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1847                         goto out;
1848                 }
1849                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1850                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1851                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1852                 for (i = 0; i < gspca_dev->nbufread; i++) {
1853                         v4l2_buf.index = i;
1854                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1855                         if (ret != 0) {
1856                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1857                                 goto out;
1858                         }
1859                 }
1860         }
1861
1862         /* start streaming */
1863         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1864         if (ret != 0)
1865                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1866 out:
1867         mutex_unlock(&gspca_dev->usb_lock);
1868         return ret;
1869 }
1870
1871 static unsigned int dev_poll(struct file *file, poll_table *wait)
1872 {
1873         struct gspca_dev *gspca_dev = video_drvdata(file);
1874         unsigned long req_events = poll_requested_events(wait);
1875         int ret = 0;
1876
1877         PDEBUG(D_FRAM, "poll");
1878
1879         if (req_events & POLLPRI)
1880                 ret |= v4l2_ctrl_poll(file, wait);
1881
1882         if (req_events & (POLLIN | POLLRDNORM)) {
1883                 /* if reqbufs is not done, the user would use read() */
1884                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1885                         if (read_alloc(gspca_dev, file) != 0) {
1886                                 ret |= POLLERR;
1887                                 goto out;
1888                         }
1889                 }
1890
1891                 poll_wait(file, &gspca_dev->wq, wait);
1892
1893                 /* check if an image has been received */
1894                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1895                         ret |= POLLERR;
1896                         goto out;
1897                 }
1898                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1899                         ret |= POLLIN | POLLRDNORM;
1900                 mutex_unlock(&gspca_dev->queue_lock);
1901         }
1902
1903 out:
1904         if (!gspca_dev->present)
1905                 ret |= POLLHUP;
1906
1907         return ret;
1908 }
1909
1910 static ssize_t dev_read(struct file *file, char __user *data,
1911                     size_t count, loff_t *ppos)
1912 {
1913         struct gspca_dev *gspca_dev = video_drvdata(file);
1914         struct gspca_frame *frame;
1915         struct v4l2_buffer v4l2_buf;
1916         struct timeval timestamp;
1917         int n, ret, ret2;
1918
1919         PDEBUG(D_FRAM, "read (%zd)", count);
1920         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1921                 ret = read_alloc(gspca_dev, file);
1922                 if (ret != 0)
1923                         return ret;
1924         }
1925
1926         /* get a frame */
1927         v4l2_get_timestamp(&timestamp);
1928         timestamp.tv_sec--;
1929         n = 2;
1930         for (;;) {
1931                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1932                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1933                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1934                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1935                 if (ret != 0) {
1936                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1937                         return ret;
1938                 }
1939
1940                 /* if the process slept for more than 1 second,
1941                  * get a newer frame */
1942                 frame = &gspca_dev->frame[v4l2_buf.index];
1943                 if (--n < 0)
1944                         break;                  /* avoid infinite loop */
1945                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1946                         break;
1947                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1948                 if (ret != 0) {
1949                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1950                         return ret;
1951                 }
1952         }
1953
1954         /* copy the frame */
1955         if (count > frame->v4l2_buf.bytesused)
1956                 count = frame->v4l2_buf.bytesused;
1957         ret = copy_to_user(data, frame->data, count);
1958         if (ret != 0) {
1959                 PERR("read cp to user lack %d / %zd", ret, count);
1960                 ret = -EFAULT;
1961                 goto out;
1962         }
1963         ret = count;
1964 out:
1965         /* in each case, requeue the buffer */
1966         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1967         if (ret2 != 0)
1968                 return ret2;
1969         return ret;
1970 }
1971
1972 static struct v4l2_file_operations dev_fops = {
1973         .owner = THIS_MODULE,
1974         .open = dev_open,
1975         .release = dev_close,
1976         .read = dev_read,
1977         .mmap = dev_mmap,
1978         .unlocked_ioctl = video_ioctl2,
1979         .poll   = dev_poll,
1980 };
1981
1982 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1983         .vidioc_querycap        = vidioc_querycap,
1984         .vidioc_dqbuf           = vidioc_dqbuf,
1985         .vidioc_qbuf            = vidioc_qbuf,
1986         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1987         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1988         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1989         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1990         .vidioc_streamon        = vidioc_streamon,
1991         .vidioc_enum_input      = vidioc_enum_input,
1992         .vidioc_g_input         = vidioc_g_input,
1993         .vidioc_s_input         = vidioc_s_input,
1994         .vidioc_reqbufs         = vidioc_reqbufs,
1995         .vidioc_querybuf        = vidioc_querybuf,
1996         .vidioc_streamoff       = vidioc_streamoff,
1997         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1998         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1999         .vidioc_g_parm          = vidioc_g_parm,
2000         .vidioc_s_parm          = vidioc_s_parm,
2001         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2002         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2003 #ifdef CONFIG_VIDEO_ADV_DEBUG
2004         .vidioc_g_chip_info     = vidioc_g_chip_info,
2005         .vidioc_g_register      = vidioc_g_register,
2006         .vidioc_s_register      = vidioc_s_register,
2007 #endif
2008         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
2009         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
2010 };
2011
2012 static const struct video_device gspca_template = {
2013         .name = "gspca main driver",
2014         .fops = &dev_fops,
2015         .ioctl_ops = &dev_ioctl_ops,
2016         .release = video_device_release_empty, /* We use v4l2_dev.release */
2017 };
2018
2019 /*
2020  * probe and create a new gspca device
2021  *
2022  * This function must be called by the sub-driver when it is
2023  * called for probing a new device.
2024  */
2025 int gspca_dev_probe2(struct usb_interface *intf,
2026                 const struct usb_device_id *id,
2027                 const struct sd_desc *sd_desc,
2028                 int dev_size,
2029                 struct module *module)
2030 {
2031         struct gspca_dev *gspca_dev;
2032         struct usb_device *dev = interface_to_usbdev(intf);
2033         int ret;
2034
2035         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2036                 sd_desc->name, id->idVendor, id->idProduct);
2037
2038         /* create the device */
2039         if (dev_size < sizeof *gspca_dev)
2040                 dev_size = sizeof *gspca_dev;
2041         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2042         if (!gspca_dev) {
2043                 pr_err("couldn't kzalloc gspca struct\n");
2044                 return -ENOMEM;
2045         }
2046         gspca_dev->usb_buf = kzalloc(USB_BUF_SZ, GFP_KERNEL);
2047         if (!gspca_dev->usb_buf) {
2048                 pr_err("out of memory\n");
2049                 ret = -ENOMEM;
2050                 goto out;
2051         }
2052         gspca_dev->dev = dev;
2053         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2054         gspca_dev->xfer_ep = -1;
2055
2056         /* check if any audio device */
2057         if (dev->actconfig->desc.bNumInterfaces != 1) {
2058                 int i;
2059                 struct usb_interface *intf2;
2060
2061                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2062                         intf2 = dev->actconfig->interface[i];
2063                         if (intf2 != NULL
2064                          && intf2->altsetting != NULL
2065                          && intf2->altsetting->desc.bInterfaceClass ==
2066                                          USB_CLASS_AUDIO) {
2067                                 gspca_dev->audio = 1;
2068                                 break;
2069                         }
2070                 }
2071         }
2072
2073         gspca_dev->v4l2_dev.release = gspca_release;
2074         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2075         if (ret)
2076                 goto out;
2077         gspca_dev->sd_desc = sd_desc;
2078         gspca_dev->nbufread = 2;
2079         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2080         gspca_dev->vdev = gspca_template;
2081         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2082         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2083         gspca_dev->module = module;
2084         gspca_dev->present = 1;
2085
2086         mutex_init(&gspca_dev->usb_lock);
2087         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2088         mutex_init(&gspca_dev->queue_lock);
2089         init_waitqueue_head(&gspca_dev->wq);
2090
2091         /* configure the subdriver and initialize the USB device */
2092         ret = sd_desc->config(gspca_dev, id);
2093         if (ret < 0)
2094                 goto out;
2095         ret = sd_desc->init(gspca_dev);
2096         if (ret < 0)
2097                 goto out;
2098         if (sd_desc->init_controls)
2099                 ret = sd_desc->init_controls(gspca_dev);
2100         if (ret < 0)
2101                 goto out;
2102         gspca_set_default_mode(gspca_dev);
2103
2104         ret = gspca_input_connect(gspca_dev);
2105         if (ret)
2106                 goto out;
2107
2108         /*
2109          * Don't take usb_lock for these ioctls. This improves latency if
2110          * usb_lock is taken for a long time, e.g. when changing a control
2111          * value, and a new frame is ready to be dequeued.
2112          */
2113         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2114         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2115         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2116 #ifdef CONFIG_VIDEO_ADV_DEBUG
2117         if (!gspca_dev->sd_desc->get_register)
2118                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2119         if (!gspca_dev->sd_desc->set_register)
2120                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2121 #endif
2122         if (!gspca_dev->sd_desc->get_jcomp)
2123                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2124         if (!gspca_dev->sd_desc->set_jcomp)
2125                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2126
2127         /* init video stuff */
2128         ret = video_register_device(&gspca_dev->vdev,
2129                                   VFL_TYPE_GRABBER,
2130                                   -1);
2131         if (ret < 0) {
2132                 pr_err("video_register_device err %d\n", ret);
2133                 goto out;
2134         }
2135
2136         usb_set_intfdata(intf, gspca_dev);
2137         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2138
2139         gspca_input_create_urb(gspca_dev);
2140
2141         return 0;
2142 out:
2143 #if IS_ENABLED(CONFIG_INPUT)
2144         if (gspca_dev->input_dev)
2145                 input_unregister_device(gspca_dev->input_dev);
2146 #endif
2147         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2148         v4l2_device_unregister(&gspca_dev->v4l2_dev);
2149         if (sd_desc->probe_error)
2150                 sd_desc->probe_error(gspca_dev);
2151         kfree(gspca_dev->usb_buf);
2152         kfree(gspca_dev);
2153         return ret;
2154 }
2155 EXPORT_SYMBOL(gspca_dev_probe2);
2156
2157 /* same function as the previous one, but check the interface */
2158 int gspca_dev_probe(struct usb_interface *intf,
2159                 const struct usb_device_id *id,
2160                 const struct sd_desc *sd_desc,
2161                 int dev_size,
2162                 struct module *module)
2163 {
2164         struct usb_device *dev = interface_to_usbdev(intf);
2165
2166         /* we don't handle multi-config cameras */
2167         if (dev->descriptor.bNumConfigurations != 1) {
2168                 pr_err("%04x:%04x too many config\n",
2169                        id->idVendor, id->idProduct);
2170                 return -ENODEV;
2171         }
2172
2173         /* the USB video interface must be the first one */
2174         if (dev->actconfig->desc.bNumInterfaces != 1
2175          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2176                 return -ENODEV;
2177
2178         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2179 }
2180 EXPORT_SYMBOL(gspca_dev_probe);
2181
2182 /*
2183  * USB disconnection
2184  *
2185  * This function must be called by the sub-driver
2186  * when the device disconnects, after the specific resources are freed.
2187  */
2188 void gspca_disconnect(struct usb_interface *intf)
2189 {
2190         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2191 #if IS_ENABLED(CONFIG_INPUT)
2192         struct input_dev *input_dev;
2193 #endif
2194
2195         PDEBUG(D_PROBE, "%s disconnect",
2196                 video_device_node_name(&gspca_dev->vdev));
2197
2198         mutex_lock(&gspca_dev->usb_lock);
2199
2200         gspca_dev->present = 0;
2201         destroy_urbs(gspca_dev);
2202
2203 #if IS_ENABLED(CONFIG_INPUT)
2204         gspca_input_destroy_urb(gspca_dev);
2205         input_dev = gspca_dev->input_dev;
2206         if (input_dev) {
2207                 gspca_dev->input_dev = NULL;
2208                 input_unregister_device(input_dev);
2209         }
2210 #endif
2211         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2212         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2213                 gspca_dev->sd_desc->stop0(gspca_dev);
2214         gspca_dev->streaming = 0;
2215         gspca_dev->dev = NULL;
2216         wake_up_interruptible(&gspca_dev->wq);
2217
2218         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2219         video_unregister_device(&gspca_dev->vdev);
2220
2221         mutex_unlock(&gspca_dev->usb_lock);
2222
2223         /* (this will call gspca_release() immediately or on last close) */
2224         v4l2_device_put(&gspca_dev->v4l2_dev);
2225 }
2226 EXPORT_SYMBOL(gspca_disconnect);
2227
2228 #ifdef CONFIG_PM
2229 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2230 {
2231         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2232
2233         gspca_input_destroy_urb(gspca_dev);
2234
2235         if (!gspca_dev->streaming)
2236                 return 0;
2237
2238         mutex_lock(&gspca_dev->usb_lock);
2239         gspca_dev->frozen = 1;          /* avoid urb error messages */
2240         gspca_dev->usb_err = 0;
2241         if (gspca_dev->sd_desc->stopN)
2242                 gspca_dev->sd_desc->stopN(gspca_dev);
2243         destroy_urbs(gspca_dev);
2244         gspca_set_alt0(gspca_dev);
2245         if (gspca_dev->sd_desc->stop0)
2246                 gspca_dev->sd_desc->stop0(gspca_dev);
2247         mutex_unlock(&gspca_dev->usb_lock);
2248
2249         return 0;
2250 }
2251 EXPORT_SYMBOL(gspca_suspend);
2252
2253 int gspca_resume(struct usb_interface *intf)
2254 {
2255         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2256         int streaming, ret = 0;
2257
2258         mutex_lock(&gspca_dev->usb_lock);
2259         gspca_dev->frozen = 0;
2260         gspca_dev->usb_err = 0;
2261         gspca_dev->sd_desc->init(gspca_dev);
2262         /*
2263          * Most subdrivers send all ctrl values on sd_start and thus
2264          * only write to the device registers on s_ctrl when streaming ->
2265          * Clear streaming to avoid setting all ctrls twice.
2266          */
2267         streaming = gspca_dev->streaming;
2268         gspca_dev->streaming = 0;
2269         if (streaming)
2270                 ret = gspca_init_transfer(gspca_dev);
2271         else
2272                 gspca_input_create_urb(gspca_dev);
2273         mutex_unlock(&gspca_dev->usb_lock);
2274
2275         return ret;
2276 }
2277 EXPORT_SYMBOL(gspca_resume);
2278 #endif
2279
2280 /* -- module insert / remove -- */
2281 static int __init gspca_init(void)
2282 {
2283         pr_info("v" GSPCA_VERSION " registered\n");
2284         return 0;
2285 }
2286 static void __exit gspca_exit(void)
2287 {
2288 }
2289
2290 module_init(gspca_init);
2291 module_exit(gspca_exit);
2292
2293 module_param_named(debug, gspca_debug, int, 0644);
2294 MODULE_PARM_DESC(debug,
2295                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");