kernel/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                 frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 440                 frame->v4l2_buf.sequence = gspca_dev->sequence++;
 441                 gspca_dev->image = frame->data;
 442                 gspca_dev->image_len = 0;
 443         } else {
 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 = 0;
 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                         pr_err("usb_alloc_urb failed\n");
 800                         return -ENOMEM;
 801                 }
 802                 gspca_dev->urb[n] = urb;
 803                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 804                                                 bsize,
 805                                                 GFP_KERNEL,
 806                                                 &urb->transfer_dma);
 807
 808                 if (urb->transfer_buffer == NULL) {
 809                         pr_err("usb_alloc_coherent failed\n");
 810                         return -ENOMEM;
 811                 }
 812                 urb->dev = gspca_dev->dev;
 813                 urb->context = gspca_dev;
 814                 urb->transfer_buffer_length = bsize;
 815                 if (npkt != 0) {                /* ISOC */
 816                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 817                                                     ep->desc.bEndpointAddress);
 818                         urb->transfer_flags = URB_ISO_ASAP
 819                                         | URB_NO_TRANSFER_DMA_MAP;
 820                         urb->interval = 1 << (ep->desc.bInterval - 1);
 821                         urb->complete = isoc_irq;
 822                         urb->number_of_packets = npkt;
 823                         for (i = 0; i < npkt; i++) {
 824                                 urb->iso_frame_desc[i].length = psize;
 825                                 urb->iso_frame_desc[i].offset = psize * i;
 826                         }
 827                 } else {                /* bulk */
 828                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 829                                                 ep->desc.bEndpointAddress);
 830                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 831                         urb->complete = bulk_irq;
 832                 }
 833         }
 834         return 0;
 835 }
 836
 837 /*
 838  * start the USB transfer
 839  */
 840 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 841 {
 842         struct usb_interface *intf;
 843         struct usb_host_endpoint *ep;
 844         struct urb *urb;
 845         struct ep_tb_s ep_tb[MAX_ALT];
 846         int n, ret, xfer, alt, alt_idx;
 847
 848         /* reset the streaming variables */
 849         gspca_dev->image = NULL;
 850         gspca_dev->image_len = 0;
 851         gspca_dev->last_packet_type = DISCARD_PACKET;
 852         gspca_dev->sequence = 0;
 853
 854         gspca_dev->usb_err = 0;
 855
 856         /* do the specific subdriver stuff before endpoint selection */
 857         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 858         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 859         if (gspca_dev->sd_desc->isoc_init) {
 860                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 861                 if (ret < 0)
 862                         return ret;
 863         }
 864         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 865                                    : USB_ENDPOINT_XFER_ISOC;
 866
 867         /* if bulk or the subdriver forced an altsetting, get the endpoint */
 868         if (gspca_dev->alt != 0) {
 869                 gspca_dev->alt--;       /* (previous version compatibility) */
 870                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
 871                               gspca_dev->xfer_ep);
 872                 if (ep == NULL) {
 873                         pr_err("bad altsetting %d\n", gspca_dev->alt);
 874                         return -EIO;
 875                 }
 876                 ep_tb[0].alt = gspca_dev->alt;
 877                 alt_idx = 1;
 878         } else {
 879                 /* else, compute the minimum bandwidth
 880                  * and build the endpoint table */
 881                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 882                 if (alt_idx <= 0) {
 883                         pr_err("no transfer endpoint found\n");
 884                         return -EIO;
 885                 }
 886         }
 887
 888         /* set the highest alternate setting and
 889          * loop until urb submit succeeds */
 890         gspca_input_destroy_urb(gspca_dev);
 891
 892         gspca_dev->alt = ep_tb[--alt_idx].alt;
 893         alt = -1;
 894         for (;;) {
 895                 if (alt != gspca_dev->alt) {
 896                         alt = gspca_dev->alt;
 897                         if (intf->num_altsetting > 1) {
 898                                 ret = usb_set_interface(gspca_dev->dev,
 899                                                         gspca_dev->iface,
 900                                                         alt);
 901                                 if (ret < 0) {
 902                                         if (ret == -ENOSPC)
 903                                                 goto retry; /*fixme: ugly*/
 904                                         pr_err("set alt %d err %d\n", alt, ret);
 905                                         goto out;
 906                                 }
 907                         }
 908                 }
 909                 if (!gspca_dev->cam.no_urb_create) {
 910                         PDEBUG(D_STREAM, "init transfer alt %d", alt);
 911                         ret = create_urbs(gspca_dev,
 912                                 alt_xfer(&intf->altsetting[alt], xfer,
 913                                          gspca_dev->xfer_ep));
 914                         if (ret < 0) {
 915                                 destroy_urbs(gspca_dev);
 916                                 goto out;
 917                         }
 918                 }
 919
 920                 /* clear the bulk endpoint */
 921                 if (gspca_dev->cam.bulk)
 922                         usb_clear_halt(gspca_dev->dev,
 923                                         gspca_dev->urb[0]->pipe);
 924
 925                 /* start the cam */
 926                 ret = gspca_dev->sd_desc->start(gspca_dev);
 927                 if (ret < 0) {
 928                         destroy_urbs(gspca_dev);
 929                         goto out;
 930                 }
 931                 gspca_dev->streaming = 1;
 932                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 933
 934                 /* some bulk transfers are started by the subdriver */
 935                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 936                         break;
 937
 938                 /* submit the URBs */
 939                 for (n = 0; n < MAX_NURBS; n++) {
 940                         urb = gspca_dev->urb[n];
 941                         if (urb == NULL)
 942                                 break;
 943                         ret = usb_submit_urb(urb, GFP_KERNEL);
 944                         if (ret < 0)
 945                                 break;
 946                 }
 947                 if (ret >= 0)
 948                         break;                  /* transfer is started */
 949
 950                 /* something when wrong
 951                  * stop the webcam and free the transfer resources */
 952                 gspca_stream_off(gspca_dev);
 953                 if (ret != -ENOSPC) {
 954                         pr_err("usb_submit_urb alt %d err %d\n",
 955                                gspca_dev->alt, ret);
 956                         goto out;
 957                 }
 958
 959                 /* the bandwidth is not wide enough
 960                  * negotiate or try a lower alternate setting */
 961 retry:
 962                 PERR("alt %d - bandwidth not wide enough, trying again", alt);
 963                 msleep(20);     /* wait for kill complete */
 964                 if (gspca_dev->sd_desc->isoc_nego) {
 965                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 966                         if (ret < 0)
 967                                 goto out;
 968                 } else {
 969                         if (alt_idx <= 0) {
 970                                 pr_err("no transfer endpoint found\n");
 971                                 ret = -EIO;
 972                                 goto out;
 973                         }
 974                         gspca_dev->alt = ep_tb[--alt_idx].alt;
 975                 }
 976         }
 977 out:
 978         gspca_input_create_urb(gspca_dev);
 979         return ret;
 980 }
 981
 982 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 983 {
 984         int i;
 985
 986         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 987         gspca_dev->curr_mode = i;
 988         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 989
 990         /* does nothing if ctrl_handler == NULL */
 991         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 992 }
 993
 994 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 995                         int width, int height)
 996 {
 997         int i;
 998
 999         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
1000                 if (width >= gspca_dev->cam.cam_mode[i].width
1001                     && height >= gspca_dev->cam.cam_mode[i].height)
1002                         break;
1003         }
1004         return i;
1005 }
1006
1007 /*
1008  * search a mode with the right pixel format
1009  */
1010 static int gspca_get_mode(struct gspca_dev *gspca_dev,
1011                         int mode,
1012                         int pixfmt)
1013 {
1014         int modeU, modeD;
1015
1016         modeU = modeD = mode;
1017         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
1018                 if (--modeD >= 0) {
1019                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
1020                                                                 == pixfmt)
1021                                 return modeD;
1022                 }
1023                 if (++modeU < gspca_dev->cam.nmodes) {
1024                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
1025                                                                 == pixfmt)
1026                                 return modeU;
1027                 }
1028         }
1029         return -EINVAL;
1030 }
1031
1032 #ifdef CONFIG_VIDEO_ADV_DEBUG
1033 static int vidioc_g_chip_info(struct file *file, void *priv,
1034                                 struct v4l2_dbg_chip_info *chip)
1035 {
1036         struct gspca_dev *gspca_dev = video_drvdata(file);
1037
1038         gspca_dev->usb_err = 0;
1039         if (gspca_dev->sd_desc->get_chip_info)
1040                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
1041         return chip->match.addr ? -EINVAL : 0;
1042 }
1043
1044 static int vidioc_g_register(struct file *file, void *priv,
1045                 struct v4l2_dbg_register *reg)
1046 {
1047         struct gspca_dev *gspca_dev = video_drvdata(file);
1048
1049         gspca_dev->usb_err = 0;
1050         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
1051 }
1052
1053 static int vidioc_s_register(struct file *file, void *priv,
1054                 const struct v4l2_dbg_register *reg)
1055 {
1056         struct gspca_dev *gspca_dev = video_drvdata(file);
1057
1058         gspca_dev->usb_err = 0;
1059         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
1060 }
1061 #endif
1062
1063 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1064                                 struct v4l2_fmtdesc *fmtdesc)
1065 {
1066         struct gspca_dev *gspca_dev = video_drvdata(file);
1067         int i, j, index;
1068         __u32 fmt_tb[8];
1069
1070         /* give an index to each format */
1071         index = 0;
1072         j = 0;
1073         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1074                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1075                 j = 0;
1076                 for (;;) {
1077                         if (fmt_tb[j] == fmt_tb[index])
1078                                 break;
1079                         j++;
1080                 }
1081                 if (j == index) {
1082                         if (fmtdesc->index == index)
1083                                 break;          /* new format */
1084                         index++;
1085                         if (index >= ARRAY_SIZE(fmt_tb))
1086                                 return -EINVAL;
1087                 }
1088         }
1089         if (i < 0)
1090                 return -EINVAL;         /* no more format */
1091
1092         fmtdesc->pixelformat = fmt_tb[index];
1093         if (gspca_dev->cam.cam_mode[i].sizeimage <
1094                         gspca_dev->cam.cam_mode[i].width *
1095                                 gspca_dev->cam.cam_mode[i].height)
1096                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1097         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1098         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1099         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1100         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1101         fmtdesc->description[4] = '\0';
1102         return 0;
1103 }
1104
1105 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1106                             struct v4l2_format *fmt)
1107 {
1108         struct gspca_dev *gspca_dev = video_drvdata(file);
1109
1110         fmt->fmt.pix = gspca_dev->pixfmt;
1111         /* some drivers use priv internally, zero it before giving it back to
1112            the core */
1113         fmt->fmt.pix.priv = 0;
1114         return 0;
1115 }
1116
1117 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1118                         struct v4l2_format *fmt)
1119 {
1120         int w, h, mode, mode2;
1121
1122         w = fmt->fmt.pix.width;
1123         h = fmt->fmt.pix.height;
1124
1125         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1126                     fmt->fmt.pix.pixelformat, w, h);
1127
1128         /* search the closest mode for width and height */
1129         mode = wxh_to_mode(gspca_dev, w, h);
1130
1131         /* OK if right palette */
1132         if (gspca_dev->cam.cam_mode[mode].pixelformat
1133                                                 != fmt->fmt.pix.pixelformat) {
1134
1135                 /* else, search the closest mode with the same pixel format */
1136                 mode2 = gspca_get_mode(gspca_dev, mode,
1137                                         fmt->fmt.pix.pixelformat);
1138                 if (mode2 >= 0)
1139                         mode = mode2;
1140         }
1141         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1142         if (gspca_dev->sd_desc->try_fmt) {
1143                 /* pass original resolution to subdriver try_fmt */
1144                 fmt->fmt.pix.width = w;
1145                 fmt->fmt.pix.height = h;
1146                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1147         }
1148         /* some drivers use priv internally, zero it before giving it back to
1149            the core */
1150         fmt->fmt.pix.priv = 0;
1151         return mode;                    /* used when s_fmt */
1152 }
1153
1154 static int vidioc_try_fmt_vid_cap(struct file *file,
1155                               void *priv,
1156                               struct v4l2_format *fmt)
1157 {
1158         struct gspca_dev *gspca_dev = video_drvdata(file);
1159         int ret;
1160
1161         ret = try_fmt_vid_cap(gspca_dev, fmt);
1162         if (ret < 0)
1163                 return ret;
1164         return 0;
1165 }
1166
1167 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1168                             struct v4l2_format *fmt)
1169 {
1170         struct gspca_dev *gspca_dev = video_drvdata(file);
1171         int ret;
1172
1173         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1174                 return -ERESTARTSYS;
1175
1176         ret = try_fmt_vid_cap(gspca_dev, fmt);
1177         if (ret < 0)
1178                 goto out;
1179
1180         if (gspca_dev->nframes != 0
1181             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1182                 ret = -EINVAL;
1183                 goto out;
1184         }
1185
1186         if (gspca_dev->streaming) {
1187                 ret = -EBUSY;
1188                 goto out;
1189         }
1190         gspca_dev->curr_mode = ret;
1191         if (gspca_dev->sd_desc->try_fmt)
1192                 /* subdriver try_fmt can modify format parameters */
1193                 gspca_dev->pixfmt = fmt->fmt.pix;
1194         else
1195                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[ret];
1196
1197         ret = 0;
1198 out:
1199         mutex_unlock(&gspca_dev->queue_lock);
1200         return ret;
1201 }
1202
1203 static int vidioc_enum_framesizes(struct file *file, void *priv,
1204                                   struct v4l2_frmsizeenum *fsize)
1205 {
1206         struct gspca_dev *gspca_dev = video_drvdata(file);
1207         int i;
1208         __u32 index = 0;
1209
1210         if (gspca_dev->sd_desc->enum_framesizes)
1211                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1212
1213         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1214                 if (fsize->pixel_format !=
1215                                 gspca_dev->cam.cam_mode[i].pixelformat)
1216                         continue;
1217
1218                 if (fsize->index == index) {
1219                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1220                         fsize->discrete.width =
1221                                 gspca_dev->cam.cam_mode[i].width;
1222                         fsize->discrete.height =
1223                                 gspca_dev->cam.cam_mode[i].height;
1224                         return 0;
1225                 }
1226                 index++;
1227         }
1228
1229         return -EINVAL;
1230 }
1231
1232 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1233                                       struct v4l2_frmivalenum *fival)
1234 {
1235         struct gspca_dev *gspca_dev = video_drvdata(filp);
1236         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1237         __u32 i;
1238
1239         if (gspca_dev->cam.mode_framerates == NULL ||
1240                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1241                 return -EINVAL;
1242
1243         if (fival->pixel_format !=
1244                         gspca_dev->cam.cam_mode[mode].pixelformat)
1245                 return -EINVAL;
1246
1247         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1248                 if (fival->index == i) {
1249                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1250                         fival->discrete.numerator = 1;
1251                         fival->discrete.denominator =
1252                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1253                         return 0;
1254                 }
1255         }
1256
1257         return -EINVAL;
1258 }
1259
1260 static void gspca_release(struct v4l2_device *v4l2_device)
1261 {
1262         struct gspca_dev *gspca_dev =
1263                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1264
1265         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1266         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1267         kfree(gspca_dev->usb_buf);
1268         kfree(gspca_dev);
1269 }
1270
1271 static int dev_open(struct file *file)
1272 {
1273         struct gspca_dev *gspca_dev = video_drvdata(file);
1274         int ret;
1275
1276         PDEBUG(D_STREAM, "[%s] open", current->comm);
1277
1278         /* protect the subdriver against rmmod */
1279         if (!try_module_get(gspca_dev->module))
1280                 return -ENODEV;
1281
1282         ret = v4l2_fh_open(file);
1283         if (ret)
1284                 module_put(gspca_dev->module);
1285         return ret;
1286 }
1287
1288 static int dev_close(struct file *file)
1289 {
1290         struct gspca_dev *gspca_dev = video_drvdata(file);
1291
1292         PDEBUG(D_STREAM, "[%s] close", current->comm);
1293
1294         /* Needed for gspca_stream_off, always lock before queue_lock! */
1295         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1296                 return -ERESTARTSYS;
1297
1298         if (mutex_lock_interruptible(&gspca_dev->queue_lock)) {
1299                 mutex_unlock(&gspca_dev->usb_lock);
1300                 return -ERESTARTSYS;
1301         }
1302
1303         /* if the file did the capture, free the streaming resources */
1304         if (gspca_dev->capt_file == file) {
1305                 if (gspca_dev->streaming)
1306                         gspca_stream_off(gspca_dev);
1307                 frame_free(gspca_dev);
1308         }
1309         module_put(gspca_dev->module);
1310         mutex_unlock(&gspca_dev->queue_lock);
1311         mutex_unlock(&gspca_dev->usb_lock);
1312
1313         PDEBUG(D_STREAM, "close done");
1314
1315         return v4l2_fh_release(file);
1316 }
1317
1318 static int vidioc_querycap(struct file *file, void  *priv,
1319                            struct v4l2_capability *cap)
1320 {
1321         struct gspca_dev *gspca_dev = video_drvdata(file);
1322
1323         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1324                         sizeof cap->driver);
1325         if (gspca_dev->dev->product != NULL) {
1326                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1327                         sizeof cap->card);
1328         } else {
1329                 snprintf((char *) cap->card, sizeof cap->card,
1330                         "USB Camera (%04x:%04x)",
1331                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1332                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1333         }
1334         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1335                         sizeof(cap->bus_info));
1336         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
1337                           | V4L2_CAP_STREAMING
1338                           | V4L2_CAP_READWRITE;
1339         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1340         return 0;
1341 }
1342
1343 static int vidioc_enum_input(struct file *file, void *priv,
1344                                 struct v4l2_input *input)
1345 {
1346         struct gspca_dev *gspca_dev = video_drvdata(file);
1347
1348         if (input->index != 0)
1349                 return -EINVAL;
1350         input->type = V4L2_INPUT_TYPE_CAMERA;
1351         input->status = gspca_dev->cam.input_flags;
1352         strlcpy(input->name, gspca_dev->sd_desc->name,
1353                 sizeof input->name);
1354         return 0;
1355 }
1356
1357 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1358 {
1359         *i = 0;
1360         return 0;
1361 }
1362
1363 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1364 {
1365         if (i > 0)
1366                 return -EINVAL;
1367         return (0);
1368 }
1369
1370 static int vidioc_reqbufs(struct file *file, void *priv,
1371                           struct v4l2_requestbuffers *rb)
1372 {
1373         struct gspca_dev *gspca_dev = video_drvdata(file);
1374         int i, ret = 0, streaming;
1375
1376         i = rb->memory;                 /* (avoid compilation warning) */
1377         switch (i) {
1378         case GSPCA_MEMORY_READ:                 /* (internal call) */
1379         case V4L2_MEMORY_MMAP:
1380         case V4L2_MEMORY_USERPTR:
1381                 break;
1382         default:
1383                 return -EINVAL;
1384         }
1385         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1386                 return -ERESTARTSYS;
1387
1388         if (gspca_dev->memory != GSPCA_MEMORY_NO
1389             && gspca_dev->memory != GSPCA_MEMORY_READ
1390             && gspca_dev->memory != rb->memory) {
1391                 ret = -EBUSY;
1392                 goto out;
1393         }
1394
1395         /* only one file may do the capture */
1396         if (gspca_dev->capt_file != NULL
1397             && gspca_dev->capt_file != file) {
1398                 ret = -EBUSY;
1399                 goto out;
1400         }
1401
1402         /* if allocated, the buffers must not be mapped */
1403         for (i = 0; i < gspca_dev->nframes; i++) {
1404                 if (gspca_dev->frame[i].vma_use_count) {
1405                         ret = -EBUSY;
1406                         goto out;
1407                 }
1408         }
1409
1410         /* stop streaming */
1411         streaming = gspca_dev->streaming;
1412         if (streaming) {
1413                 gspca_stream_off(gspca_dev);
1414
1415                 /* Don't restart the stream when switching from read
1416                  * to mmap mode */
1417                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1418                         streaming = 0;
1419         }
1420
1421         /* free the previous allocated buffers, if any */
1422         if (gspca_dev->nframes != 0)
1423                 frame_free(gspca_dev);
1424         if (rb->count == 0)                     /* unrequest */
1425                 goto out;
1426         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1427         if (ret == 0) {
1428                 rb->count = gspca_dev->nframes;
1429                 if (streaming)
1430                         ret = gspca_init_transfer(gspca_dev);
1431         }
1432 out:
1433         mutex_unlock(&gspca_dev->queue_lock);
1434         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1435         return ret;
1436 }
1437
1438 static int vidioc_querybuf(struct file *file, void *priv,
1439                            struct v4l2_buffer *v4l2_buf)
1440 {
1441         struct gspca_dev *gspca_dev = video_drvdata(file);
1442         struct gspca_frame *frame;
1443
1444         if (v4l2_buf->index >= gspca_dev->nframes)
1445                 return -EINVAL;
1446
1447         frame = &gspca_dev->frame[v4l2_buf->index];
1448         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1449         return 0;
1450 }
1451
1452 static int vidioc_streamon(struct file *file, void *priv,
1453                            enum v4l2_buf_type buf_type)
1454 {
1455         struct gspca_dev *gspca_dev = video_drvdata(file);
1456         int ret;
1457
1458         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1459                 return -EINVAL;
1460         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1461                 return -ERESTARTSYS;
1462
1463         /* check the capture file */
1464         if (gspca_dev->capt_file != file) {
1465                 ret = -EBUSY;
1466                 goto out;
1467         }
1468
1469         if (gspca_dev->nframes == 0
1470             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1471                 ret = -EINVAL;
1472                 goto out;
1473         }
1474         if (!gspca_dev->streaming) {
1475                 ret = gspca_init_transfer(gspca_dev);
1476                 if (ret < 0)
1477                         goto out;
1478         }
1479         PDEBUG_MODE(gspca_dev, D_STREAM, "stream on OK",
1480                     gspca_dev->pixfmt.pixelformat,
1481                     gspca_dev->pixfmt.width, gspca_dev->pixfmt.height);
1482         ret = 0;
1483 out:
1484         mutex_unlock(&gspca_dev->queue_lock);
1485         return ret;
1486 }
1487
1488 static int vidioc_streamoff(struct file *file, void *priv,
1489                                 enum v4l2_buf_type buf_type)
1490 {
1491         struct gspca_dev *gspca_dev = video_drvdata(file);
1492         int i, ret;
1493
1494         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1495                 return -EINVAL;
1496
1497         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1498                 return -ERESTARTSYS;
1499
1500         if (!gspca_dev->streaming) {
1501                 ret = 0;
1502                 goto out;
1503         }
1504
1505         /* check the capture file */
1506         if (gspca_dev->capt_file != file) {
1507                 ret = -EBUSY;
1508                 goto out;
1509         }
1510
1511         /* stop streaming */
1512         gspca_stream_off(gspca_dev);
1513         /* In case another thread is waiting in dqbuf */
1514         wake_up_interruptible(&gspca_dev->wq);
1515
1516         /* empty the transfer queues */
1517         for (i = 0; i < gspca_dev->nframes; i++)
1518                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1519         atomic_set(&gspca_dev->fr_q, 0);
1520         atomic_set(&gspca_dev->fr_i, 0);
1521         gspca_dev->fr_o = 0;
1522         ret = 0;
1523 out:
1524         mutex_unlock(&gspca_dev->queue_lock);
1525         return ret;
1526 }
1527
1528 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1529                         struct v4l2_jpegcompression *jpegcomp)
1530 {
1531         struct gspca_dev *gspca_dev = video_drvdata(file);
1532
1533         gspca_dev->usb_err = 0;
1534         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1535 }
1536
1537 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1538                         const struct v4l2_jpegcompression *jpegcomp)
1539 {
1540         struct gspca_dev *gspca_dev = video_drvdata(file);
1541
1542         gspca_dev->usb_err = 0;
1543         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1544 }
1545
1546 static int vidioc_g_parm(struct file *filp, void *priv,
1547                         struct v4l2_streamparm *parm)
1548 {
1549         struct gspca_dev *gspca_dev = video_drvdata(filp);
1550
1551         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1552
1553         if (gspca_dev->sd_desc->get_streamparm) {
1554                 gspca_dev->usb_err = 0;
1555                 gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1556                 return gspca_dev->usb_err;
1557         }
1558         return 0;
1559 }
1560
1561 static int vidioc_s_parm(struct file *filp, void *priv,
1562                         struct v4l2_streamparm *parm)
1563 {
1564         struct gspca_dev *gspca_dev = video_drvdata(filp);
1565         unsigned int n;
1566
1567         n = parm->parm.capture.readbuffers;
1568         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1569                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1570         else
1571                 gspca_dev->nbufread = n;
1572
1573         if (gspca_dev->sd_desc->set_streamparm) {
1574                 gspca_dev->usb_err = 0;
1575                 gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1576                 return gspca_dev->usb_err;
1577         }
1578
1579         return 0;
1580 }
1581
1582 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1583 {
1584         struct gspca_dev *gspca_dev = video_drvdata(file);
1585         struct gspca_frame *frame;
1586         struct page *page;
1587         unsigned long addr, start, size;
1588         int i, ret;
1589
1590         start = vma->vm_start;
1591         size = vma->vm_end - vma->vm_start;
1592         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1593
1594         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1595                 return -ERESTARTSYS;
1596         if (gspca_dev->capt_file != file) {
1597                 ret = -EINVAL;
1598                 goto out;
1599         }
1600
1601         frame = NULL;
1602         for (i = 0; i < gspca_dev->nframes; ++i) {
1603                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1604                         PDEBUG(D_STREAM, "mmap bad memory type");
1605                         break;
1606                 }
1607                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1608                                                 == vma->vm_pgoff) {
1609                         frame = &gspca_dev->frame[i];
1610                         break;
1611                 }
1612         }
1613         if (frame == NULL) {
1614                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1615                 ret = -EINVAL;
1616                 goto out;
1617         }
1618         if (size != frame->v4l2_buf.length) {
1619                 PDEBUG(D_STREAM, "mmap bad size");
1620                 ret = -EINVAL;
1621                 goto out;
1622         }
1623
1624         /*
1625          * - VM_IO marks the area as being a mmaped region for I/O to a
1626          *   device. It also prevents the region from being core dumped.
1627          */
1628         vma->vm_flags |= VM_IO;
1629
1630         addr = (unsigned long) frame->data;
1631         while (size > 0) {
1632                 page = vmalloc_to_page((void *) addr);
1633                 ret = vm_insert_page(vma, start, page);
1634                 if (ret < 0)
1635                         goto out;
1636                 start += PAGE_SIZE;
1637                 addr += PAGE_SIZE;
1638                 size -= PAGE_SIZE;
1639         }
1640
1641         vma->vm_ops = &gspca_vm_ops;
1642         vma->vm_private_data = frame;
1643         gspca_vm_open(vma);
1644         ret = 0;
1645 out:
1646         mutex_unlock(&gspca_dev->queue_lock);
1647         return ret;
1648 }
1649
1650 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1651                                 enum v4l2_memory memory)
1652 {
1653         if (!gspca_dev->present)
1654                 return -ENODEV;
1655         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1656                         !gspca_dev->streaming)
1657                 return -EINVAL;
1658
1659         /* check if a frame is ready */
1660         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1661 }
1662
1663 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1664                         enum v4l2_memory memory)
1665 {
1666         int ret;
1667
1668         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1669                 return -ERESTARTSYS;
1670         ret = frame_ready_nolock(gspca_dev, file, memory);
1671         mutex_unlock(&gspca_dev->queue_lock);
1672         return ret;
1673 }
1674
1675 /*
1676  * dequeue a video buffer
1677  *
1678  * If nonblock_ing is false, block until a buffer is available.
1679  */
1680 static int vidioc_dqbuf(struct file *file, void *priv,
1681                         struct v4l2_buffer *v4l2_buf)
1682 {
1683         struct gspca_dev *gspca_dev = video_drvdata(file);
1684         struct gspca_frame *frame;
1685         int i, j, ret;
1686
1687         PDEBUG(D_FRAM, "dqbuf");
1688
1689         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1690                 return -ERESTARTSYS;
1691
1692         for (;;) {
1693                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1694                 if (ret < 0)
1695                         goto out;
1696                 if (ret > 0)
1697                         break;
1698
1699                 mutex_unlock(&gspca_dev->queue_lock);
1700
1701                 if (file->f_flags & O_NONBLOCK)
1702                         return -EAGAIN;
1703
1704                 /* wait till a frame is ready */
1705                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1706                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1707                         msecs_to_jiffies(3000));
1708                 if (ret < 0)
1709                         return ret;
1710                 if (ret == 0)
1711                         return -EIO;
1712
1713                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1714                         return -ERESTARTSYS;
1715         }
1716
1717         i = gspca_dev->fr_o;
1718         j = gspca_dev->fr_queue[i];
1719         frame = &gspca_dev->frame[j];
1720
1721         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1722
1723         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1724         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1725         PDEBUG(D_FRAM, "dqbuf %d", j);
1726         ret = 0;
1727
1728         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1729                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1730                                  frame->data,
1731                                  frame->v4l2_buf.bytesused)) {
1732                         PERR("dqbuf cp to user failed");
1733                         ret = -EFAULT;
1734                 }
1735         }
1736 out:
1737         mutex_unlock(&gspca_dev->queue_lock);
1738
1739         if (ret == 0 && gspca_dev->sd_desc->dq_callback) {
1740                 mutex_lock(&gspca_dev->usb_lock);
1741                 gspca_dev->usb_err = 0;
1742                 if (gspca_dev->present)
1743                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1744                 mutex_unlock(&gspca_dev->usb_lock);
1745         }
1746
1747         return ret;
1748 }
1749
1750 /*
1751  * queue a video buffer
1752  *
1753  * Attempting to queue a buffer that has already been
1754  * queued will return -EINVAL.
1755  */
1756 static int vidioc_qbuf(struct file *file, void *priv,
1757                         struct v4l2_buffer *v4l2_buf)
1758 {
1759         struct gspca_dev *gspca_dev = video_drvdata(file);
1760         struct gspca_frame *frame;
1761         int i, index, ret;
1762
1763         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1764
1765         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1766                 return -ERESTARTSYS;
1767
1768         index = v4l2_buf->index;
1769         if ((unsigned) index >= gspca_dev->nframes) {
1770                 PDEBUG(D_FRAM,
1771                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1772                 ret = -EINVAL;
1773                 goto out;
1774         }
1775         if (v4l2_buf->memory != gspca_dev->memory) {
1776                 PDEBUG(D_FRAM, "qbuf bad memory type");
1777                 ret = -EINVAL;
1778                 goto out;
1779         }
1780
1781         frame = &gspca_dev->frame[index];
1782         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1783                 PDEBUG(D_FRAM, "qbuf bad state");
1784                 ret = -EINVAL;
1785                 goto out;
1786         }
1787
1788         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1789
1790         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1791                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1792                 frame->v4l2_buf.length = v4l2_buf->length;
1793         }
1794
1795         /* put the buffer in the 'queued' queue */
1796         i = atomic_read(&gspca_dev->fr_q);
1797         gspca_dev->fr_queue[i] = index;
1798         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1799
1800         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1801         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1802         ret = 0;
1803 out:
1804         mutex_unlock(&gspca_dev->queue_lock);
1805         return ret;
1806 }
1807
1808 /*
1809  * allocate the resources for read()
1810  */
1811 static int read_alloc(struct gspca_dev *gspca_dev,
1812                         struct file *file)
1813 {
1814         struct v4l2_buffer v4l2_buf;
1815         int i, ret;
1816
1817         PDEBUG(D_STREAM, "read alloc");
1818
1819         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1820                 return -ERESTARTSYS;
1821
1822         if (gspca_dev->nframes == 0) {
1823                 struct v4l2_requestbuffers rb;
1824
1825                 memset(&rb, 0, sizeof rb);
1826                 rb.count = gspca_dev->nbufread;
1827                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1828                 rb.memory = GSPCA_MEMORY_READ;
1829                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1830                 if (ret != 0) {
1831                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1832                         goto out;
1833                 }
1834                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1835                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1836                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1837                 for (i = 0; i < gspca_dev->nbufread; i++) {
1838                         v4l2_buf.index = i;
1839                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1840                         if (ret != 0) {
1841                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1842                                 goto out;
1843                         }
1844                 }
1845         }
1846
1847         /* start streaming */
1848         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
1849         if (ret != 0)
1850                 PDEBUG(D_STREAM, "read streamon err %d", ret);
1851 out:
1852         mutex_unlock(&gspca_dev->usb_lock);
1853         return ret;
1854 }
1855
1856 static unsigned int dev_poll(struct file *file, poll_table *wait)
1857 {
1858         struct gspca_dev *gspca_dev = video_drvdata(file);
1859         unsigned long req_events = poll_requested_events(wait);
1860         int ret = 0;
1861
1862         PDEBUG(D_FRAM, "poll");
1863
1864         if (req_events & POLLPRI)
1865                 ret |= v4l2_ctrl_poll(file, wait);
1866
1867         if (req_events & (POLLIN | POLLRDNORM)) {
1868                 /* if reqbufs is not done, the user would use read() */
1869                 if (gspca_dev->memory == GSPCA_MEMORY_NO) {
1870                         if (read_alloc(gspca_dev, file) != 0) {
1871                                 ret |= POLLERR;
1872                                 goto out;
1873                         }
1874                 }
1875
1876                 poll_wait(file, &gspca_dev->wq, wait);
1877
1878                 /* check if an image has been received */
1879                 if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {
1880                         ret |= POLLERR;
1881                         goto out;
1882                 }
1883                 if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
1884                         ret |= POLLIN | POLLRDNORM;
1885                 mutex_unlock(&gspca_dev->queue_lock);
1886         }
1887
1888 out:
1889         if (!gspca_dev->present)
1890                 ret |= POLLHUP;
1891
1892         return ret;
1893 }
1894
1895 static ssize_t dev_read(struct file *file, char __user *data,
1896                     size_t count, loff_t *ppos)
1897 {
1898         struct gspca_dev *gspca_dev = video_drvdata(file);
1899         struct gspca_frame *frame;
1900         struct v4l2_buffer v4l2_buf;
1901         struct timeval timestamp;
1902         int n, ret, ret2;
1903
1904         PDEBUG(D_FRAM, "read (%zd)", count);
1905         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
1906                 ret = read_alloc(gspca_dev, file);
1907                 if (ret != 0)
1908                         return ret;
1909         }
1910
1911         /* get a frame */
1912         timestamp = ktime_to_timeval(ktime_get());
1913         timestamp.tv_sec--;
1914         n = 2;
1915         for (;;) {
1916                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1917                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1918                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1919                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
1920                 if (ret != 0) {
1921                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
1922                         return ret;
1923                 }
1924
1925                 /* if the process slept for more than 1 second,
1926                  * get a newer frame */
1927                 frame = &gspca_dev->frame[v4l2_buf.index];
1928                 if (--n < 0)
1929                         break;                  /* avoid infinite loop */
1930                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
1931                         break;
1932                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1933                 if (ret != 0) {
1934                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
1935                         return ret;
1936                 }
1937         }
1938
1939         /* copy the frame */
1940         if (count > frame->v4l2_buf.bytesused)
1941                 count = frame->v4l2_buf.bytesused;
1942         ret = copy_to_user(data, frame->data, count);
1943         if (ret != 0) {
1944                 PERR("read cp to user lack %d / %zd", ret, count);
1945                 ret = -EFAULT;
1946                 goto out;
1947         }
1948         ret = count;
1949 out:
1950         /* in each case, requeue the buffer */
1951         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1952         if (ret2 != 0)
1953                 return ret2;
1954         return ret;
1955 }
1956
1957 static struct v4l2_file_operations dev_fops = {
1958         .owner = THIS_MODULE,
1959         .open = dev_open,
1960         .release = dev_close,
1961         .read = dev_read,
1962         .mmap = dev_mmap,
1963         .unlocked_ioctl = video_ioctl2,
1964         .poll   = dev_poll,
1965 };
1966
1967 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1968         .vidioc_querycap        = vidioc_querycap,
1969         .vidioc_dqbuf           = vidioc_dqbuf,
1970         .vidioc_qbuf            = vidioc_qbuf,
1971         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1972         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1973         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1974         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1975         .vidioc_streamon        = vidioc_streamon,
1976         .vidioc_enum_input      = vidioc_enum_input,
1977         .vidioc_g_input         = vidioc_g_input,
1978         .vidioc_s_input         = vidioc_s_input,
1979         .vidioc_reqbufs         = vidioc_reqbufs,
1980         .vidioc_querybuf        = vidioc_querybuf,
1981         .vidioc_streamoff       = vidioc_streamoff,
1982         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
1983         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
1984         .vidioc_g_parm          = vidioc_g_parm,
1985         .vidioc_s_parm          = vidioc_s_parm,
1986         .vidioc_enum_framesizes = vidioc_enum_framesizes,
1987         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1988 #ifdef CONFIG_VIDEO_ADV_DEBUG
1989         .vidioc_g_chip_info     = vidioc_g_chip_info,
1990         .vidioc_g_register      = vidioc_g_register,
1991         .vidioc_s_register      = vidioc_s_register,
1992 #endif
1993         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1994         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1995 };
1996
1997 static const struct video_device gspca_template = {
1998         .name = "gspca main driver",
1999         .fops = &dev_fops,
2000         .ioctl_ops = &dev_ioctl_ops,
2001         .release = video_device_release_empty, /* We use v4l2_dev.release */
2002 };
2003
2004 /*
2005  * probe and create a new gspca device
2006  *
2007  * This function must be called by the sub-driver when it is
2008  * called for probing a new device.
2009  */
2010 int gspca_dev_probe2(struct usb_interface *intf,
2011                 const struct usb_device_id *id,
2012                 const struct sd_desc *sd_desc,
2013                 int dev_size,
2014                 struct module *module)
2015 {
2016         struct gspca_dev *gspca_dev;
2017         struct usb_device *dev = interface_to_usbdev(intf);
2018         int ret;
2019
2020         pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
2021                 sd_desc->name, id->idVendor, id->idProduct);
2022
2023         /* create the device */
2024         if (dev_size < sizeof *gspca_dev)
2025                 dev_size = sizeof *gspca_dev;
2026         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2027         if (!gspca_dev) {
2028                 pr_err("couldn't kzalloc gspca struct\n");
2029                 return -ENOMEM;
2030         }
2031         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2032         if (!gspca_dev->usb_buf) {
2033                 pr_err("out of memory\n");
2034                 ret = -ENOMEM;
2035                 goto out;
2036         }
2037         gspca_dev->dev = dev;
2038         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2039         gspca_dev->xfer_ep = -1;
2040
2041         /* check if any audio device */
2042         if (dev->actconfig->desc.bNumInterfaces != 1) {
2043                 int i;
2044                 struct usb_interface *intf2;
2045
2046                 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
2047                         intf2 = dev->actconfig->interface[i];
2048                         if (intf2 != NULL
2049                          && intf2->altsetting != NULL
2050                          && intf2->altsetting->desc.bInterfaceClass ==
2051                                          USB_CLASS_AUDIO) {
2052                                 gspca_dev->audio = 1;
2053                                 break;
2054                         }
2055                 }
2056         }
2057
2058         gspca_dev->v4l2_dev.release = gspca_release;
2059         ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
2060         if (ret)
2061                 goto out;
2062         gspca_dev->sd_desc = sd_desc;
2063         gspca_dev->nbufread = 2;
2064         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2065         gspca_dev->vdev = gspca_template;
2066         gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
2067         video_set_drvdata(&gspca_dev->vdev, gspca_dev);
2068         gspca_dev->module = module;
2069         gspca_dev->present = 1;
2070
2071         mutex_init(&gspca_dev->usb_lock);
2072         gspca_dev->vdev.lock = &gspca_dev->usb_lock;
2073         mutex_init(&gspca_dev->queue_lock);
2074         init_waitqueue_head(&gspca_dev->wq);
2075
2076         /* configure the subdriver and initialize the USB device */
2077         ret = sd_desc->config(gspca_dev, id);
2078         if (ret < 0)
2079                 goto out;
2080         ret = sd_desc->init(gspca_dev);
2081         if (ret < 0)
2082                 goto out;
2083         if (sd_desc->init_controls)
2084                 ret = sd_desc->init_controls(gspca_dev);
2085         if (ret < 0)
2086                 goto out;
2087         gspca_set_default_mode(gspca_dev);
2088
2089         ret = gspca_input_connect(gspca_dev);
2090         if (ret)
2091                 goto out;
2092
2093         /*
2094          * Don't take usb_lock for these ioctls. This improves latency if
2095          * usb_lock is taken for a long time, e.g. when changing a control
2096          * value, and a new frame is ready to be dequeued.
2097          */
2098         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_DQBUF);
2099         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QBUF);
2100         v4l2_disable_ioctl_locking(&gspca_dev->vdev, VIDIOC_QUERYBUF);
2101 #ifdef CONFIG_VIDEO_ADV_DEBUG
2102         if (!gspca_dev->sd_desc->get_register)
2103                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
2104         if (!gspca_dev->sd_desc->set_register)
2105                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
2106 #endif
2107         if (!gspca_dev->sd_desc->get_jcomp)
2108                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
2109         if (!gspca_dev->sd_desc->set_jcomp)
2110                 v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
2111
2112         /* init video stuff */
2113         ret = video_register_device(&gspca_dev->vdev,
2114                                   VFL_TYPE_GRABBER,
2115                                   -1);
2116         if (ret < 0) {
2117                 pr_err("video_register_device err %d\n", ret);
2118                 goto out;
2119         }
2120
2121         usb_set_intfdata(intf, gspca_dev);
2122         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2123
2124         gspca_input_create_urb(gspca_dev);
2125
2126         return 0;
2127 out:
2128 #if IS_ENABLED(CONFIG_INPUT)
2129         if (gspca_dev->input_dev)
2130                 input_unregister_device(gspca_dev->input_dev);
2131 #endif
2132         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
2133         kfree(gspca_dev->usb_buf);
2134         kfree(gspca_dev);
2135         return ret;
2136 }
2137 EXPORT_SYMBOL(gspca_dev_probe2);
2138
2139 /* same function as the previous one, but check the interface */
2140 int gspca_dev_probe(struct usb_interface *intf,
2141                 const struct usb_device_id *id,
2142                 const struct sd_desc *sd_desc,
2143                 int dev_size,
2144                 struct module *module)
2145 {
2146         struct usb_device *dev = interface_to_usbdev(intf);
2147
2148         /* we don't handle multi-config cameras */
2149         if (dev->descriptor.bNumConfigurations != 1) {
2150                 pr_err("%04x:%04x too many config\n",
2151                        id->idVendor, id->idProduct);
2152                 return -ENODEV;
2153         }
2154
2155         /* the USB video interface must be the first one */
2156         if (dev->actconfig->desc.bNumInterfaces != 1
2157          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2158                 return -ENODEV;
2159
2160         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2161 }
2162 EXPORT_SYMBOL(gspca_dev_probe);
2163
2164 /*
2165  * USB disconnection
2166  *
2167  * This function must be called by the sub-driver
2168  * when the device disconnects, after the specific resources are freed.
2169  */
2170 void gspca_disconnect(struct usb_interface *intf)
2171 {
2172         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2173 #if IS_ENABLED(CONFIG_INPUT)
2174         struct input_dev *input_dev;
2175 #endif
2176
2177         PDEBUG(D_PROBE, "%s disconnect",
2178                 video_device_node_name(&gspca_dev->vdev));
2179
2180         mutex_lock(&gspca_dev->usb_lock);
2181
2182         gspca_dev->present = 0;
2183         destroy_urbs(gspca_dev);
2184
2185 #if IS_ENABLED(CONFIG_INPUT)
2186         gspca_input_destroy_urb(gspca_dev);
2187         input_dev = gspca_dev->input_dev;
2188         if (input_dev) {
2189                 gspca_dev->input_dev = NULL;
2190                 input_unregister_device(input_dev);
2191         }
2192 #endif
2193         /* Free subdriver's streaming resources / stop sd workqueue(s) */
2194         if (gspca_dev->sd_desc->stop0 && gspca_dev->streaming)
2195                 gspca_dev->sd_desc->stop0(gspca_dev);
2196         gspca_dev->streaming = 0;
2197         gspca_dev->dev = NULL;
2198         wake_up_interruptible(&gspca_dev->wq);
2199
2200         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
2201         video_unregister_device(&gspca_dev->vdev);
2202
2203         mutex_unlock(&gspca_dev->usb_lock);
2204
2205         /* (this will call gspca_release() immediately or on last close) */
2206         v4l2_device_put(&gspca_dev->v4l2_dev);
2207 }
2208 EXPORT_SYMBOL(gspca_disconnect);
2209
2210 #ifdef CONFIG_PM
2211 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2212 {
2213         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2214
2215         gspca_input_destroy_urb(gspca_dev);
2216
2217         if (!gspca_dev->streaming)
2218                 return 0;
2219
2220         mutex_lock(&gspca_dev->usb_lock);
2221         gspca_dev->frozen = 1;          /* avoid urb error messages */
2222         gspca_dev->usb_err = 0;
2223         if (gspca_dev->sd_desc->stopN)
2224                 gspca_dev->sd_desc->stopN(gspca_dev);
2225         destroy_urbs(gspca_dev);
2226         gspca_set_alt0(gspca_dev);
2227         if (gspca_dev->sd_desc->stop0)
2228                 gspca_dev->sd_desc->stop0(gspca_dev);
2229         mutex_unlock(&gspca_dev->usb_lock);
2230
2231         return 0;
2232 }
2233 EXPORT_SYMBOL(gspca_suspend);
2234
2235 int gspca_resume(struct usb_interface *intf)
2236 {
2237         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2238         int streaming, ret = 0;
2239
2240         mutex_lock(&gspca_dev->usb_lock);
2241         gspca_dev->frozen = 0;
2242         gspca_dev->usb_err = 0;
2243         gspca_dev->sd_desc->init(gspca_dev);
2244         /*
2245          * Most subdrivers send all ctrl values on sd_start and thus
2246          * only write to the device registers on s_ctrl when streaming ->
2247          * Clear streaming to avoid setting all ctrls twice.
2248          */
2249         streaming = gspca_dev->streaming;
2250         gspca_dev->streaming = 0;
2251         if (streaming)
2252                 ret = gspca_init_transfer(gspca_dev);
2253         else
2254                 gspca_input_create_urb(gspca_dev);
2255         mutex_unlock(&gspca_dev->usb_lock);
2256
2257         return ret;
2258 }
2259 EXPORT_SYMBOL(gspca_resume);
2260 #endif
2261
2262 /* -- module insert / remove -- */
2263 static int __init gspca_init(void)
2264 {
2265         pr_info("v" GSPCA_VERSION " registered\n");
2266         return 0;
2267 }
2268 static void __exit gspca_exit(void)
2269 {
2270 }
2271
2272 module_init(gspca_init);
2273 module_exit(gspca_exit);
2274
2275 module_param_named(debug, gspca_debug, int, 0644);
2276 MODULE_PARM_DESC(debug,
2277                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");