drivers/media/video/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 MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/fs.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/mm.h>
  32 #include <linux/string.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/io.h>
  35 #include <asm/page.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/ktime.h>
  38 #include <media/v4l2-ioctl.h>
  39
  40 #include "gspca.h"
  41
  42 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  43 #include <linux/input.h>
  44 #include <linux/usb/input.h>
  45 #endif
  46
  47 /* global values */
  48 #define DEF_NURBS 3             /* default number of URBs */
  49 #if DEF_NURBS > MAX_NURBS
  50 #error "DEF_NURBS too big"
  51 #endif
  52
  53 #define DRIVER_VERSION_NUMBER   "2.13.0"
  54
  55 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  56 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  57 MODULE_LICENSE("GPL");
  58 MODULE_VERSION(DRIVER_VERSION_NUMBER);
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         err("Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         err("Input device registration failed with error %i",
 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                 PDEBUG(D_ERR, "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                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 316                 urb->status = 0;
 317                 goto resubmit;
 318         }
 319         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 320         for (i = 0; i < urb->number_of_packets; i++) {
 321                 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                         err("ISOC data error: [%d] len=%d, status=%d",
 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                 err("usb_submit_urb() ret %d", 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                 PDEBUG(D_ERR|D_PACK, "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                         err("usb_submit_urb() ret %d", 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                         PDEBUG(D_ERR|D_PACK, "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                                 err("gspca_frame_add() image == NULL");
 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 gspca_is_compressed(__u32 format)
 501 {
 502         switch (format) {
 503         case V4L2_PIX_FMT_MJPEG:
 504         case V4L2_PIX_FMT_JPEG:
 505         case V4L2_PIX_FMT_SPCA561:
 506         case V4L2_PIX_FMT_PAC207:
 507         case V4L2_PIX_FMT_MR97310A:
 508                 return 1;
 509         }
 510         return 0;
 511 }
 512
 513 static int frame_alloc(struct gspca_dev *gspca_dev, struct file *file,
 514                         enum v4l2_memory memory, unsigned int count)
 515 {
 516         struct gspca_frame *frame;
 517         unsigned int frsz;
 518         int i;
 519
 520         i = gspca_dev->curr_mode;
 521         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 522         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 523         frsz = PAGE_ALIGN(frsz);
 524         if (count >= GSPCA_MAX_FRAMES)
 525                 count = GSPCA_MAX_FRAMES - 1;
 526         gspca_dev->frbuf = vmalloc_32(frsz * count);
 527         if (!gspca_dev->frbuf) {
 528                 err("frame alloc failed");
 529                 return -ENOMEM;
 530         }
 531         gspca_dev->capt_file = file;
 532         gspca_dev->memory = memory;
 533         gspca_dev->frsz = frsz;
 534         gspca_dev->nframes = count;
 535         for (i = 0; i < count; i++) {
 536                 frame = &gspca_dev->frame[i];
 537                 frame->v4l2_buf.index = i;
 538                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 539                 frame->v4l2_buf.flags = 0;
 540                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 541                 frame->v4l2_buf.length = frsz;
 542                 frame->v4l2_buf.memory = memory;
 543                 frame->v4l2_buf.sequence = 0;
 544                 frame->data = gspca_dev->frbuf + i * frsz;
 545                 frame->v4l2_buf.m.offset = i * frsz;
 546         }
 547         atomic_set(&gspca_dev->fr_q, 0);
 548         atomic_set(&gspca_dev->fr_i, 0);
 549         gspca_dev->fr_o = 0;
 550         return 0;
 551 }
 552
 553 static void frame_free(struct gspca_dev *gspca_dev)
 554 {
 555         int i;
 556
 557         PDEBUG(D_STREAM, "frame free");
 558         if (gspca_dev->frbuf != NULL) {
 559                 vfree(gspca_dev->frbuf);
 560                 gspca_dev->frbuf = NULL;
 561                 for (i = 0; i < gspca_dev->nframes; i++)
 562                         gspca_dev->frame[i].data = NULL;
 563         }
 564         gspca_dev->nframes = 0;
 565         gspca_dev->frsz = 0;
 566         gspca_dev->capt_file = NULL;
 567         gspca_dev->memory = GSPCA_MEMORY_NO;
 568 }
 569
 570 static void destroy_urbs(struct gspca_dev *gspca_dev)
 571 {
 572         struct urb *urb;
 573         unsigned int i;
 574
 575         PDEBUG(D_STREAM, "kill transfer");
 576         for (i = 0; i < MAX_NURBS; i++) {
 577                 urb = gspca_dev->urb[i];
 578                 if (urb == NULL)
 579                         break;
 580
 581                 gspca_dev->urb[i] = NULL;
 582                 usb_kill_urb(urb);
 583                 if (urb->transfer_buffer != NULL)
 584                         usb_free_coherent(gspca_dev->dev,
 585                                           urb->transfer_buffer_length,
 586                                           urb->transfer_buffer,
 587                                           urb->transfer_dma);
 588                 usb_free_urb(urb);
 589         }
 590 }
 591
 592 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 593 {
 594         int ret;
 595
 596         if (gspca_dev->alt == 0)
 597                 return 0;
 598         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 599         if (ret < 0)
 600                 err("set alt 0 err %d", ret);
 601         return ret;
 602 }
 603
 604 /* Note: both the queue and the usb locks should be held when calling this */
 605 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 606 {
 607         gspca_dev->streaming = 0;
 608         if (gspca_dev->present) {
 609                 if (gspca_dev->sd_desc->stopN)
 610                         gspca_dev->sd_desc->stopN(gspca_dev);
 611                 destroy_urbs(gspca_dev);
 612                 gspca_input_destroy_urb(gspca_dev);
 613                 gspca_set_alt0(gspca_dev);
 614                 gspca_input_create_urb(gspca_dev);
 615         }
 616
 617         /* always call stop0 to free the subdriver's resources */
 618         if (gspca_dev->sd_desc->stop0)
 619                 gspca_dev->sd_desc->stop0(gspca_dev);
 620         PDEBUG(D_STREAM, "stream off OK");
 621 }
 622
 623 /*
 624  * look for an input transfer endpoint in an alternate setting
 625  */
 626 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 627                                           int xfer)
 628 {
 629         struct usb_host_endpoint *ep;
 630         int i, attr;
 631
 632         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 633                 ep = &alt->endpoint[i];
 634                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 635                 if (attr == xfer
 636                     && ep->desc.wMaxPacketSize != 0
 637                     && usb_endpoint_dir_in(&ep->desc))
 638                         return ep;
 639         }
 640         return NULL;
 641 }
 642
 643 /*
 644  * look for an input (isoc or bulk) endpoint
 645  *
 646  * The endpoint is defined by the subdriver.
 647  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 648  * This routine may be called many times when the bandwidth is too small
 649  * (the bandwidth is checked on urb submit).
 650  */
 651 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 652 {
 653         struct usb_interface *intf;
 654         struct usb_host_endpoint *ep;
 655         int xfer, i, ret;
 656
 657         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 658         ep = NULL;
 659         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 660                                    : USB_ENDPOINT_XFER_ISOC;
 661         i = gspca_dev->alt;                     /* previous alt setting */
 662         if (gspca_dev->cam.reverse_alts) {
 663                 while (++i < gspca_dev->nbalt) {
 664                         ep = alt_xfer(&intf->altsetting[i], xfer);
 665                         if (ep)
 666                                 break;
 667                 }
 668         } else {
 669                 while (--i >= 0) {
 670                         ep = alt_xfer(&intf->altsetting[i], xfer);
 671                         if (ep)
 672                                 break;
 673                 }
 674         }
 675         if (ep == NULL) {
 676                 err("no transfer endpoint found");
 677                 return NULL;
 678         }
 679         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 680                         i, ep->desc.bEndpointAddress);
 681         gspca_dev->alt = i;             /* memorize the current alt setting */
 682         if (gspca_dev->nbalt > 1) {
 683                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 684                 if (ret < 0) {
 685                         err("set alt %d err %d", i, ret);
 686                         ep = NULL;
 687                 }
 688         }
 689         return ep;
 690 }
 691
 692 /*
 693  * create the URBs for image transfer
 694  */
 695 static int create_urbs(struct gspca_dev *gspca_dev,
 696                         struct usb_host_endpoint *ep)
 697 {
 698         struct urb *urb;
 699         int n, nurbs, i, psize, npkt, bsize;
 700
 701         /* calculate the packet size and the number of packets */
 702         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 703
 704         if (!gspca_dev->cam.bulk) {             /* isoc */
 705
 706                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 707                 if (gspca_dev->pkt_size == 0)
 708                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 709                 else
 710                         psize = gspca_dev->pkt_size;
 711                 npkt = gspca_dev->cam.npkt;
 712                 if (npkt == 0)
 713                         npkt = 32;              /* default value */
 714                 bsize = psize * npkt;
 715                 PDEBUG(D_STREAM,
 716                         "isoc %d pkts size %d = bsize:%d",
 717                         npkt, psize, bsize);
 718                 nurbs = DEF_NURBS;
 719         } else {                                /* bulk */
 720                 npkt = 0;
 721                 bsize = gspca_dev->cam.bulk_size;
 722                 if (bsize == 0)
 723                         bsize = psize;
 724                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 725                 if (gspca_dev->cam.bulk_nurbs != 0)
 726                         nurbs = gspca_dev->cam.bulk_nurbs;
 727                 else
 728                         nurbs = 1;
 729         }
 730
 731         for (n = 0; n < nurbs; n++) {
 732                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 733                 if (!urb) {
 734                         err("usb_alloc_urb failed");
 735                         return -ENOMEM;
 736                 }
 737                 gspca_dev->urb[n] = urb;
 738                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 739                                                 bsize,
 740                                                 GFP_KERNEL,
 741                                                 &urb->transfer_dma);
 742
 743                 if (urb->transfer_buffer == NULL) {
 744                         err("usb_alloc_coherent failed");
 745                         return -ENOMEM;
 746                 }
 747                 urb->dev = gspca_dev->dev;
 748                 urb->context = gspca_dev;
 749                 urb->transfer_buffer_length = bsize;
 750                 if (npkt != 0) {                /* ISOC */
 751                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 752                                                     ep->desc.bEndpointAddress);
 753                         urb->transfer_flags = URB_ISO_ASAP
 754                                         | URB_NO_TRANSFER_DMA_MAP;
 755                         urb->interval = ep->desc.bInterval;
 756                         urb->complete = isoc_irq;
 757                         urb->number_of_packets = npkt;
 758                         for (i = 0; i < npkt; i++) {
 759                                 urb->iso_frame_desc[i].length = psize;
 760                                 urb->iso_frame_desc[i].offset = psize * i;
 761                         }
 762                 } else {                /* bulk */
 763                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 764                                                 ep->desc.bEndpointAddress);
 765                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 766                         urb->complete = bulk_irq;
 767                 }
 768         }
 769         return 0;
 770 }
 771
 772 /*
 773  * start the USB transfer
 774  */
 775 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 776 {
 777         struct usb_host_endpoint *ep;
 778         struct urb *urb;
 779         int n, ret;
 780
 781         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 782                 return -ERESTARTSYS;
 783
 784         if (!gspca_dev->present) {
 785                 ret = -ENODEV;
 786                 goto unlock;
 787         }
 788
 789         /* reset the streaming variables */
 790         gspca_dev->image = NULL;
 791         gspca_dev->image_len = 0;
 792         gspca_dev->last_packet_type = DISCARD_PACKET;
 793         gspca_dev->sequence = 0;
 794
 795         gspca_dev->usb_err = 0;
 796
 797         /* set the higher alternate setting and
 798          * loop until urb submit succeeds */
 799         if (gspca_dev->cam.reverse_alts)
 800                 gspca_dev->alt = 0;
 801         else
 802                 gspca_dev->alt = gspca_dev->nbalt;
 803
 804         if (gspca_dev->sd_desc->isoc_init) {
 805                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 806                 if (ret < 0)
 807                         goto unlock;
 808         }
 809
 810         gspca_input_destroy_urb(gspca_dev);
 811         ep = get_ep(gspca_dev);
 812         if (ep == NULL) {
 813                 ret = -EIO;
 814                 goto out;
 815         }
 816         for (;;) {
 817                 if (!gspca_dev->cam.no_urb_create) {
 818                         PDEBUG(D_STREAM, "init transfer alt %d",
 819                                 gspca_dev->alt);
 820                         ret = create_urbs(gspca_dev, ep);
 821                         if (ret < 0) {
 822                                 destroy_urbs(gspca_dev);
 823                                 goto out;
 824                         }
 825                 }
 826
 827                 /* clear the bulk endpoint */
 828                 if (gspca_dev->cam.bulk)
 829                         usb_clear_halt(gspca_dev->dev,
 830                                         gspca_dev->urb[0]->pipe);
 831
 832                 /* start the cam */
 833                 ret = gspca_dev->sd_desc->start(gspca_dev);
 834                 if (ret < 0) {
 835                         destroy_urbs(gspca_dev);
 836                         goto out;
 837                 }
 838                 gspca_dev->streaming = 1;
 839
 840                 /* some bulk transfers are started by the subdriver */
 841                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 842                         break;
 843
 844                 /* submit the URBs */
 845                 for (n = 0; n < MAX_NURBS; n++) {
 846                         urb = gspca_dev->urb[n];
 847                         if (urb == NULL)
 848                                 break;
 849                         ret = usb_submit_urb(urb, GFP_KERNEL);
 850                         if (ret < 0)
 851                                 break;
 852                 }
 853                 if (ret >= 0)
 854                         break;
 855                 gspca_stream_off(gspca_dev);
 856                 if (ret != -ENOSPC) {
 857                         err("usb_submit_urb alt %d err %d",
 858                                 gspca_dev->alt, ret);
 859                         goto out;
 860                 }
 861
 862                 /* the bandwidth is not wide enough
 863                  * negotiate or try a lower alternate setting */
 864                 PDEBUG(D_ERR|D_STREAM,
 865                         "bandwidth not wide enough - trying again");
 866                 msleep(20);     /* wait for kill complete */
 867                 if (gspca_dev->sd_desc->isoc_nego) {
 868                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 869                         if (ret < 0)
 870                                 goto out;
 871                 } else {
 872                         ep = get_ep(gspca_dev);
 873                         if (ep == NULL) {
 874                                 ret = -EIO;
 875                                 goto out;
 876                         }
 877                 }
 878         }
 879 out:
 880         gspca_input_create_urb(gspca_dev);
 881 unlock:
 882         mutex_unlock(&gspca_dev->usb_lock);
 883         return ret;
 884 }
 885
 886 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 887 {
 888         struct gspca_ctrl *ctrl;
 889         int i;
 890
 891         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 892         gspca_dev->curr_mode = i;
 893         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 894         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 895         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 896
 897         /* set the current control values to their default values
 898          * which may have changed in sd_init() */
 899         ctrl = gspca_dev->cam.ctrls;
 900         if (ctrl != NULL) {
 901                 for (i = 0;
 902                      i < gspca_dev->sd_desc->nctrls;
 903                      i++, ctrl++)
 904                         ctrl->val = ctrl->def;
 905         }
 906 }
 907
 908 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 909                         int width, int height)
 910 {
 911         int i;
 912
 913         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 914                 if (width >= gspca_dev->cam.cam_mode[i].width
 915                     && height >= gspca_dev->cam.cam_mode[i].height)
 916                         break;
 917         }
 918         return i;
 919 }
 920
 921 /*
 922  * search a mode with the right pixel format
 923  */
 924 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 925                         int mode,
 926                         int pixfmt)
 927 {
 928         int modeU, modeD;
 929
 930         modeU = modeD = mode;
 931         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 932                 if (--modeD >= 0) {
 933                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 934                                                                 == pixfmt)
 935                                 return modeD;
 936                 }
 937                 if (++modeU < gspca_dev->cam.nmodes) {
 938                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 939                                                                 == pixfmt)
 940                                 return modeU;
 941                 }
 942         }
 943         return -EINVAL;
 944 }
 945
 946 #ifdef CONFIG_VIDEO_ADV_DEBUG
 947 static int vidioc_g_register(struct file *file, void *priv,
 948                         struct v4l2_dbg_register *reg)
 949 {
 950         int ret;
 951         struct gspca_dev *gspca_dev = priv;
 952
 953         if (!gspca_dev->sd_desc->get_chip_ident)
 954                 return -EINVAL;
 955
 956         if (!gspca_dev->sd_desc->get_register)
 957                 return -EINVAL;
 958
 959         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 960                 return -ERESTARTSYS;
 961         gspca_dev->usb_err = 0;
 962         if (gspca_dev->present)
 963                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 964         else
 965                 ret = -ENODEV;
 966         mutex_unlock(&gspca_dev->usb_lock);
 967
 968         return ret;
 969 }
 970
 971 static int vidioc_s_register(struct file *file, void *priv,
 972                         struct v4l2_dbg_register *reg)
 973 {
 974         int ret;
 975         struct gspca_dev *gspca_dev = priv;
 976
 977         if (!gspca_dev->sd_desc->get_chip_ident)
 978                 return -EINVAL;
 979
 980         if (!gspca_dev->sd_desc->set_register)
 981                 return -EINVAL;
 982
 983         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 984                 return -ERESTARTSYS;
 985         gspca_dev->usb_err = 0;
 986         if (gspca_dev->present)
 987                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 988         else
 989                 ret = -ENODEV;
 990         mutex_unlock(&gspca_dev->usb_lock);
 991
 992         return ret;
 993 }
 994 #endif
 995
 996 static int vidioc_g_chip_ident(struct file *file, void *priv,
 997                         struct v4l2_dbg_chip_ident *chip)
 998 {
 999         int ret;
1000         struct gspca_dev *gspca_dev = priv;
1001
1002         if (!gspca_dev->sd_desc->get_chip_ident)
1003                 return -EINVAL;
1004
1005         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1006                 return -ERESTARTSYS;
1007         gspca_dev->usb_err = 0;
1008         if (gspca_dev->present)
1009                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
1010         else
1011                 ret = -ENODEV;
1012         mutex_unlock(&gspca_dev->usb_lock);
1013
1014         return ret;
1015 }
1016
1017 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1018                                 struct v4l2_fmtdesc *fmtdesc)
1019 {
1020         struct gspca_dev *gspca_dev = priv;
1021         int i, j, index;
1022         __u32 fmt_tb[8];
1023
1024         /* give an index to each format */
1025         index = 0;
1026         j = 0;
1027         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1028                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1029                 j = 0;
1030                 for (;;) {
1031                         if (fmt_tb[j] == fmt_tb[index])
1032                                 break;
1033                         j++;
1034                 }
1035                 if (j == index) {
1036                         if (fmtdesc->index == index)
1037                                 break;          /* new format */
1038                         index++;
1039                         if (index >= ARRAY_SIZE(fmt_tb))
1040                                 return -EINVAL;
1041                 }
1042         }
1043         if (i < 0)
1044                 return -EINVAL;         /* no more format */
1045
1046         fmtdesc->pixelformat = fmt_tb[index];
1047         if (gspca_is_compressed(fmt_tb[index]))
1048                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1049         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1050         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1051         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1052         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1053         fmtdesc->description[4] = '\0';
1054         return 0;
1055 }
1056
1057 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1058                             struct v4l2_format *fmt)
1059 {
1060         struct gspca_dev *gspca_dev = priv;
1061         int mode;
1062
1063         mode = gspca_dev->curr_mode;
1064         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1065                 sizeof fmt->fmt.pix);
1066         return 0;
1067 }
1068
1069 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1070                         struct v4l2_format *fmt)
1071 {
1072         int w, h, mode, mode2;
1073
1074         w = fmt->fmt.pix.width;
1075         h = fmt->fmt.pix.height;
1076
1077 #ifdef GSPCA_DEBUG
1078         if (gspca_debug & D_CONF)
1079                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1080 #endif
1081         /* search the closest mode for width and height */
1082         mode = wxh_to_mode(gspca_dev, w, h);
1083
1084         /* OK if right palette */
1085         if (gspca_dev->cam.cam_mode[mode].pixelformat
1086                                                 != fmt->fmt.pix.pixelformat) {
1087
1088                 /* else, search the closest mode with the same pixel format */
1089                 mode2 = gspca_get_mode(gspca_dev, mode,
1090                                         fmt->fmt.pix.pixelformat);
1091                 if (mode2 >= 0)
1092                         mode = mode2;
1093 /*              else
1094                         ;                * no chance, return this mode */
1095         }
1096         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1097                 sizeof fmt->fmt.pix);
1098         return mode;                    /* used when s_fmt */
1099 }
1100
1101 static int vidioc_try_fmt_vid_cap(struct file *file,
1102                               void *priv,
1103                               struct v4l2_format *fmt)
1104 {
1105         struct gspca_dev *gspca_dev = priv;
1106         int ret;
1107
1108         ret = try_fmt_vid_cap(gspca_dev, fmt);
1109         if (ret < 0)
1110                 return ret;
1111         return 0;
1112 }
1113
1114 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1115                             struct v4l2_format *fmt)
1116 {
1117         struct gspca_dev *gspca_dev = priv;
1118         int ret;
1119
1120         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1121                 return -ERESTARTSYS;
1122
1123         ret = try_fmt_vid_cap(gspca_dev, fmt);
1124         if (ret < 0)
1125                 goto out;
1126
1127         if (gspca_dev->nframes != 0
1128             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1129                 ret = -EINVAL;
1130                 goto out;
1131         }
1132
1133         if (ret == gspca_dev->curr_mode) {
1134                 ret = 0;
1135                 goto out;                       /* same mode */
1136         }
1137
1138         if (gspca_dev->streaming) {
1139                 ret = -EBUSY;
1140                 goto out;
1141         }
1142         gspca_dev->width = fmt->fmt.pix.width;
1143         gspca_dev->height = fmt->fmt.pix.height;
1144         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1145         gspca_dev->curr_mode = ret;
1146
1147         ret = 0;
1148 out:
1149         mutex_unlock(&gspca_dev->queue_lock);
1150         return ret;
1151 }
1152
1153 static int vidioc_enum_framesizes(struct file *file, void *priv,
1154                                   struct v4l2_frmsizeenum *fsize)
1155 {
1156         struct gspca_dev *gspca_dev = priv;
1157         int i;
1158         __u32 index = 0;
1159
1160         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1161                 if (fsize->pixel_format !=
1162                                 gspca_dev->cam.cam_mode[i].pixelformat)
1163                         continue;
1164
1165                 if (fsize->index == index) {
1166                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1167                         fsize->discrete.width =
1168                                 gspca_dev->cam.cam_mode[i].width;
1169                         fsize->discrete.height =
1170                                 gspca_dev->cam.cam_mode[i].height;
1171                         return 0;
1172                 }
1173                 index++;
1174         }
1175
1176         return -EINVAL;
1177 }
1178
1179 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1180                                       struct v4l2_frmivalenum *fival)
1181 {
1182         struct gspca_dev *gspca_dev = priv;
1183         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1184         __u32 i;
1185
1186         if (gspca_dev->cam.mode_framerates == NULL ||
1187                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1188                 return -EINVAL;
1189
1190         if (fival->pixel_format !=
1191                         gspca_dev->cam.cam_mode[mode].pixelformat)
1192                 return -EINVAL;
1193
1194         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1195                 if (fival->index == i) {
1196                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1197                         fival->discrete.numerator = 1;
1198                         fival->discrete.denominator =
1199                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1200                         return 0;
1201                 }
1202         }
1203
1204         return -EINVAL;
1205 }
1206
1207 static void gspca_release(struct video_device *vfd)
1208 {
1209         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1210
1211         PDEBUG(D_PROBE, "%s released",
1212                 video_device_node_name(&gspca_dev->vdev));
1213
1214         kfree(gspca_dev->usb_buf);
1215         kfree(gspca_dev);
1216 }
1217
1218 static int dev_open(struct file *file)
1219 {
1220         struct gspca_dev *gspca_dev;
1221
1222         PDEBUG(D_STREAM, "[%s] open", current->comm);
1223         gspca_dev = (struct gspca_dev *) video_devdata(file);
1224         if (!gspca_dev->present)
1225                 return -ENODEV;
1226
1227         /* protect the subdriver against rmmod */
1228         if (!try_module_get(gspca_dev->module))
1229                 return -ENODEV;
1230
1231         file->private_data = gspca_dev;
1232 #ifdef GSPCA_DEBUG
1233         /* activate the v4l2 debug */
1234         if (gspca_debug & D_V4L2)
1235                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1236                                         | V4L2_DEBUG_IOCTL_ARG;
1237         else
1238                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1239                                         | V4L2_DEBUG_IOCTL_ARG);
1240 #endif
1241         return 0;
1242 }
1243
1244 static int dev_close(struct file *file)
1245 {
1246         struct gspca_dev *gspca_dev = file->private_data;
1247
1248         PDEBUG(D_STREAM, "[%s] close", current->comm);
1249         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1250                 return -ERESTARTSYS;
1251
1252         /* if the file did the capture, free the streaming resources */
1253         if (gspca_dev->capt_file == file) {
1254                 if (gspca_dev->streaming) {
1255                         mutex_lock(&gspca_dev->usb_lock);
1256                         gspca_dev->usb_err = 0;
1257                         gspca_stream_off(gspca_dev);
1258                         mutex_unlock(&gspca_dev->usb_lock);
1259                 }
1260                 frame_free(gspca_dev);
1261         }
1262         file->private_data = NULL;
1263         module_put(gspca_dev->module);
1264         mutex_unlock(&gspca_dev->queue_lock);
1265
1266         PDEBUG(D_STREAM, "close done");
1267
1268         return 0;
1269 }
1270
1271 static int vidioc_querycap(struct file *file, void  *priv,
1272                            struct v4l2_capability *cap)
1273 {
1274         struct gspca_dev *gspca_dev = priv;
1275         int ret;
1276
1277         /* protect the access to the usb device */
1278         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1279                 return -ERESTARTSYS;
1280         if (!gspca_dev->present) {
1281                 ret = -ENODEV;
1282                 goto out;
1283         }
1284         strlcpy((char *) cap->driver, gspca_dev->sd_desc->name,
1285                         sizeof cap->driver);
1286         if (gspca_dev->dev->product != NULL) {
1287                 strlcpy((char *) cap->card, gspca_dev->dev->product,
1288                         sizeof cap->card);
1289         } else {
1290                 snprintf((char *) cap->card, sizeof cap->card,
1291                         "USB Camera (%04x:%04x)",
1292                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1293                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1294         }
1295         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1296                         sizeof(cap->bus_info));
1297         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1298                           | V4L2_CAP_STREAMING
1299                           | V4L2_CAP_READWRITE;
1300         ret = 0;
1301 out:
1302         mutex_unlock(&gspca_dev->usb_lock);
1303         return ret;
1304 }
1305
1306 static int get_ctrl(struct gspca_dev *gspca_dev,
1307                                    int id)
1308 {
1309         const struct ctrl *ctrls;
1310         int i;
1311
1312         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1313              i < gspca_dev->sd_desc->nctrls;
1314              i++, ctrls++) {
1315                 if (gspca_dev->ctrl_dis & (1 << i))
1316                         continue;
1317                 if (id == ctrls->qctrl.id)
1318                         return i;
1319         }
1320         return -1;
1321 }
1322
1323 static int vidioc_queryctrl(struct file *file, void *priv,
1324                            struct v4l2_queryctrl *q_ctrl)
1325 {
1326         struct gspca_dev *gspca_dev = priv;
1327         const struct ctrl *ctrls;
1328         struct gspca_ctrl *gspca_ctrl;
1329         int i, idx;
1330         u32 id;
1331
1332         id = q_ctrl->id;
1333         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1334                 id &= V4L2_CTRL_ID_MASK;
1335                 id++;
1336                 idx = -1;
1337                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1338                         if (gspca_dev->ctrl_dis & (1 << i))
1339                                 continue;
1340                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1341                                 continue;
1342                         if (idx >= 0
1343                          && gspca_dev->sd_desc->ctrls[i].qctrl.id
1344                                     > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1345                                 continue;
1346                         idx = i;
1347                 }
1348         } else {
1349                 idx = get_ctrl(gspca_dev, id);
1350         }
1351         if (idx < 0)
1352                 return -EINVAL;
1353         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1354         memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
1355         if (gspca_dev->cam.ctrls != NULL) {
1356                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1357                 q_ctrl->default_value = gspca_ctrl->def;
1358                 q_ctrl->minimum = gspca_ctrl->min;
1359                 q_ctrl->maximum = gspca_ctrl->max;
1360         }
1361         if (gspca_dev->ctrl_inac & (1 << idx))
1362                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1363         return 0;
1364 }
1365
1366 static int vidioc_s_ctrl(struct file *file, void *priv,
1367                          struct v4l2_control *ctrl)
1368 {
1369         struct gspca_dev *gspca_dev = priv;
1370         const struct ctrl *ctrls;
1371         struct gspca_ctrl *gspca_ctrl;
1372         int idx, ret;
1373
1374         idx = get_ctrl(gspca_dev, ctrl->id);
1375         if (idx < 0)
1376                 return -EINVAL;
1377         if (gspca_dev->ctrl_inac & (1 << idx))
1378                 return -EINVAL;
1379         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1380         if (gspca_dev->cam.ctrls != NULL) {
1381                 gspca_ctrl = &gspca_dev->cam.ctrls[idx];
1382                 if (ctrl->value < gspca_ctrl->min
1383                     || ctrl->value > gspca_ctrl->max)
1384                         return -ERANGE;
1385         } else {
1386                 gspca_ctrl = NULL;
1387                 if (ctrl->value < ctrls->qctrl.minimum
1388                     || ctrl->value > ctrls->qctrl.maximum)
1389                         return -ERANGE;
1390         }
1391         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1392         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1393                 return -ERESTARTSYS;
1394         if (!gspca_dev->present) {
1395                 ret = -ENODEV;
1396                 goto out;
1397         }
1398         gspca_dev->usb_err = 0;
1399         if (ctrls->set != NULL) {
1400                 ret = ctrls->set(gspca_dev, ctrl->value);
1401                 goto out;
1402         }
1403         if (gspca_ctrl != NULL) {
1404                 gspca_ctrl->val = ctrl->value;
1405                 if (ctrls->set_control != NULL
1406                  && gspca_dev->streaming)
1407                         ctrls->set_control(gspca_dev);
1408         }
1409         ret = gspca_dev->usb_err;
1410 out:
1411         mutex_unlock(&gspca_dev->usb_lock);
1412         return ret;
1413 }
1414
1415 static int vidioc_g_ctrl(struct file *file, void *priv,
1416                          struct v4l2_control *ctrl)
1417 {
1418         struct gspca_dev *gspca_dev = priv;
1419         const struct ctrl *ctrls;
1420         int idx, ret;
1421
1422         idx = get_ctrl(gspca_dev, ctrl->id);
1423         if (idx < 0)
1424                 return -EINVAL;
1425         ctrls = &gspca_dev->sd_desc->ctrls[idx];
1426
1427         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1428                 return -ERESTARTSYS;
1429         if (!gspca_dev->present) {
1430                 ret = -ENODEV;
1431                 goto out;
1432         }
1433         gspca_dev->usb_err = 0;
1434         if (ctrls->get != NULL) {
1435                 ret = ctrls->get(gspca_dev, &ctrl->value);
1436                 goto out;
1437         }
1438         if (gspca_dev->cam.ctrls != NULL)
1439                 ctrl->value = gspca_dev->cam.ctrls[idx].val;
1440         ret = 0;
1441 out:
1442         mutex_unlock(&gspca_dev->usb_lock);
1443         return ret;
1444 }
1445
1446 static int vidioc_querymenu(struct file *file, void *priv,
1447                             struct v4l2_querymenu *qmenu)
1448 {
1449         struct gspca_dev *gspca_dev = priv;
1450
1451         if (!gspca_dev->sd_desc->querymenu)
1452                 return -EINVAL;
1453         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1454 }
1455
1456 static int vidioc_enum_input(struct file *file, void *priv,
1457                                 struct v4l2_input *input)
1458 {
1459         struct gspca_dev *gspca_dev = priv;
1460
1461         if (input->index != 0)
1462                 return -EINVAL;
1463         input->type = V4L2_INPUT_TYPE_CAMERA;
1464         input->status = gspca_dev->cam.input_flags;
1465         strlcpy(input->name, gspca_dev->sd_desc->name,
1466                 sizeof input->name);
1467         return 0;
1468 }
1469
1470 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1471 {
1472         *i = 0;
1473         return 0;
1474 }
1475
1476 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1477 {
1478         if (i > 0)
1479                 return -EINVAL;
1480         return (0);
1481 }
1482
1483 static int vidioc_reqbufs(struct file *file, void *priv,
1484                           struct v4l2_requestbuffers *rb)
1485 {
1486         struct gspca_dev *gspca_dev = priv;
1487         int i, ret = 0, streaming;
1488
1489         i = rb->memory;                 /* (avoid compilation warning) */
1490         switch (i) {
1491         case GSPCA_MEMORY_READ:                 /* (internal call) */
1492         case V4L2_MEMORY_MMAP:
1493         case V4L2_MEMORY_USERPTR:
1494                 break;
1495         default:
1496                 return -EINVAL;
1497         }
1498         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1499                 return -ERESTARTSYS;
1500
1501         if (gspca_dev->memory != GSPCA_MEMORY_NO
1502             && gspca_dev->memory != GSPCA_MEMORY_READ
1503             && gspca_dev->memory != rb->memory) {
1504                 ret = -EBUSY;
1505                 goto out;
1506         }
1507
1508         /* only one file may do the capture */
1509         if (gspca_dev->capt_file != NULL
1510             && gspca_dev->capt_file != file) {
1511                 ret = -EBUSY;
1512                 goto out;
1513         }
1514
1515         /* if allocated, the buffers must not be mapped */
1516         for (i = 0; i < gspca_dev->nframes; i++) {
1517                 if (gspca_dev->frame[i].vma_use_count) {
1518                         ret = -EBUSY;
1519                         goto out;
1520                 }
1521         }
1522
1523         /* stop streaming */
1524         streaming = gspca_dev->streaming;
1525         if (streaming) {
1526                 mutex_lock(&gspca_dev->usb_lock);
1527                 gspca_dev->usb_err = 0;
1528                 gspca_stream_off(gspca_dev);
1529                 mutex_unlock(&gspca_dev->usb_lock);
1530
1531                 /* Don't restart the stream when switching from read
1532                  * to mmap mode */
1533                 if (gspca_dev->memory == GSPCA_MEMORY_READ)
1534                         streaming = 0;
1535         }
1536
1537         /* free the previous allocated buffers, if any */
1538         if (gspca_dev->nframes != 0)
1539                 frame_free(gspca_dev);
1540         if (rb->count == 0)                     /* unrequest */
1541                 goto out;
1542         ret = frame_alloc(gspca_dev, file, rb->memory, rb->count);
1543         if (ret == 0) {
1544                 rb->count = gspca_dev->nframes;
1545                 if (streaming)
1546                         ret = gspca_init_transfer(gspca_dev);
1547         }
1548 out:
1549         mutex_unlock(&gspca_dev->queue_lock);
1550         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1551         return ret;
1552 }
1553
1554 static int vidioc_querybuf(struct file *file, void *priv,
1555                            struct v4l2_buffer *v4l2_buf)
1556 {
1557         struct gspca_dev *gspca_dev = priv;
1558         struct gspca_frame *frame;
1559
1560         if (v4l2_buf->index < 0
1561             || v4l2_buf->index >= gspca_dev->nframes)
1562                 return -EINVAL;
1563
1564         frame = &gspca_dev->frame[v4l2_buf->index];
1565         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1566         return 0;
1567 }
1568
1569 static int vidioc_streamon(struct file *file, void *priv,
1570                            enum v4l2_buf_type buf_type)
1571 {
1572         struct gspca_dev *gspca_dev = priv;
1573         int ret;
1574
1575         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1576                 return -EINVAL;
1577         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1578                 return -ERESTARTSYS;
1579
1580         /* check the capture file */
1581         if (gspca_dev->capt_file != file) {
1582                 ret = -EBUSY;
1583                 goto out;
1584         }
1585
1586         if (gspca_dev->nframes == 0
1587             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1588                 ret = -EINVAL;
1589                 goto out;
1590         }
1591         if (!gspca_dev->streaming) {
1592                 ret = gspca_init_transfer(gspca_dev);
1593                 if (ret < 0)
1594                         goto out;
1595         }
1596 #ifdef GSPCA_DEBUG
1597         if (gspca_debug & D_STREAM) {
1598                 PDEBUG_MODE("stream on OK",
1599                         gspca_dev->pixfmt,
1600                         gspca_dev->width,
1601                         gspca_dev->height);
1602         }
1603 #endif
1604         ret = 0;
1605 out:
1606         mutex_unlock(&gspca_dev->queue_lock);
1607         return ret;
1608 }
1609
1610 static int vidioc_streamoff(struct file *file, void *priv,
1611                                 enum v4l2_buf_type buf_type)
1612 {
1613         struct gspca_dev *gspca_dev = priv;
1614         int ret;
1615
1616         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1617                 return -EINVAL;
1618
1619         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1620                 return -ERESTARTSYS;
1621
1622         if (!gspca_dev->streaming) {
1623                 ret = 0;
1624                 goto out;
1625         }
1626
1627         /* check the capture file */
1628         if (gspca_dev->capt_file != file) {
1629                 ret = -EBUSY;
1630                 goto out;
1631         }
1632
1633         /* stop streaming */
1634         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1635                 ret = -ERESTARTSYS;
1636                 goto out;
1637         }
1638         gspca_dev->usb_err = 0;
1639         gspca_stream_off(gspca_dev);
1640         mutex_unlock(&gspca_dev->usb_lock);
1641         /* In case another thread is waiting in dqbuf */
1642         wake_up_interruptible(&gspca_dev->wq);
1643
1644         /* empty the transfer queues */
1645         atomic_set(&gspca_dev->fr_q, 0);
1646         atomic_set(&gspca_dev->fr_i, 0);
1647         gspca_dev->fr_o = 0;
1648         ret = 0;
1649 out:
1650         mutex_unlock(&gspca_dev->queue_lock);
1651         return ret;
1652 }
1653
1654 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1655                         struct v4l2_jpegcompression *jpegcomp)
1656 {
1657         struct gspca_dev *gspca_dev = priv;
1658         int ret;
1659
1660         if (!gspca_dev->sd_desc->get_jcomp)
1661                 return -EINVAL;
1662         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1663                 return -ERESTARTSYS;
1664         gspca_dev->usb_err = 0;
1665         if (gspca_dev->present)
1666                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1667         else
1668                 ret = -ENODEV;
1669         mutex_unlock(&gspca_dev->usb_lock);
1670         return ret;
1671 }
1672
1673 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1674                         struct v4l2_jpegcompression *jpegcomp)
1675 {
1676         struct gspca_dev *gspca_dev = priv;
1677         int ret;
1678
1679         if (!gspca_dev->sd_desc->set_jcomp)
1680                 return -EINVAL;
1681         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1682                 return -ERESTARTSYS;
1683         gspca_dev->usb_err = 0;
1684         if (gspca_dev->present)
1685                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1686         else
1687                 ret = -ENODEV;
1688         mutex_unlock(&gspca_dev->usb_lock);
1689         return ret;
1690 }
1691
1692 static int vidioc_g_parm(struct file *filp, void *priv,
1693                         struct v4l2_streamparm *parm)
1694 {
1695         struct gspca_dev *gspca_dev = priv;
1696
1697         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1698
1699         if (gspca_dev->sd_desc->get_streamparm) {
1700                 int ret;
1701
1702                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1703                         return -ERESTARTSYS;
1704                 if (gspca_dev->present) {
1705                         gspca_dev->usb_err = 0;
1706                         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1707                         ret = gspca_dev->usb_err;
1708                 } else {
1709                         ret = -ENODEV;
1710                 }
1711                 mutex_unlock(&gspca_dev->usb_lock);
1712                 return ret;
1713         }
1714
1715         return 0;
1716 }
1717
1718 static int vidioc_s_parm(struct file *filp, void *priv,
1719                         struct v4l2_streamparm *parm)
1720 {
1721         struct gspca_dev *gspca_dev = priv;
1722         int n;
1723
1724         n = parm->parm.capture.readbuffers;
1725         if (n == 0 || n >= GSPCA_MAX_FRAMES)
1726                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1727         else
1728                 gspca_dev->nbufread = n;
1729
1730         if (gspca_dev->sd_desc->set_streamparm) {
1731                 int ret;
1732
1733                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1734                         return -ERESTARTSYS;
1735                 if (gspca_dev->present) {
1736                         gspca_dev->usb_err = 0;
1737                         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1738                         ret = gspca_dev->usb_err;
1739                 } else {
1740                         ret = -ENODEV;
1741                 }
1742                 mutex_unlock(&gspca_dev->usb_lock);
1743                 return ret;
1744         }
1745
1746         return 0;
1747 }
1748
1749 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1750 {
1751         struct gspca_dev *gspca_dev = file->private_data;
1752         struct gspca_frame *frame;
1753         struct page *page;
1754         unsigned long addr, start, size;
1755         int i, ret;
1756
1757         start = vma->vm_start;
1758         size = vma->vm_end - vma->vm_start;
1759         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1760
1761         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1762                 return -ERESTARTSYS;
1763         if (!gspca_dev->present) {
1764                 ret = -ENODEV;
1765                 goto out;
1766         }
1767         if (gspca_dev->capt_file != file) {
1768                 ret = -EINVAL;
1769                 goto out;
1770         }
1771
1772         frame = NULL;
1773         for (i = 0; i < gspca_dev->nframes; ++i) {
1774                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1775                         PDEBUG(D_STREAM, "mmap bad memory type");
1776                         break;
1777                 }
1778                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1779                                                 == vma->vm_pgoff) {
1780                         frame = &gspca_dev->frame[i];
1781                         break;
1782                 }
1783         }
1784         if (frame == NULL) {
1785                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1786                 ret = -EINVAL;
1787                 goto out;
1788         }
1789         if (size != frame->v4l2_buf.length) {
1790                 PDEBUG(D_STREAM, "mmap bad size");
1791                 ret = -EINVAL;
1792                 goto out;
1793         }
1794
1795         /*
1796          * - VM_IO marks the area as being a mmaped region for I/O to a
1797          *   device. It also prevents the region from being core dumped.
1798          */
1799         vma->vm_flags |= VM_IO;
1800
1801         addr = (unsigned long) frame->data;
1802         while (size > 0) {
1803                 page = vmalloc_to_page((void *) addr);
1804                 ret = vm_insert_page(vma, start, page);
1805                 if (ret < 0)
1806                         goto out;
1807                 start += PAGE_SIZE;
1808                 addr += PAGE_SIZE;
1809                 size -= PAGE_SIZE;
1810         }
1811
1812         vma->vm_ops = &gspca_vm_ops;
1813         vma->vm_private_data = frame;
1814         gspca_vm_open(vma);
1815         ret = 0;
1816 out:
1817         mutex_unlock(&gspca_dev->queue_lock);
1818         return ret;
1819 }
1820
1821 static int frame_ready_nolock(struct gspca_dev *gspca_dev, struct file *file,
1822                                 enum v4l2_memory memory)
1823 {
1824         if (!gspca_dev->present)
1825                 return -ENODEV;
1826         if (gspca_dev->capt_file != file || gspca_dev->memory != memory ||
1827                         !gspca_dev->streaming)
1828                 return -EINVAL;
1829
1830         /* check if a frame is ready */
1831         return gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i);
1832 }
1833
1834 static int frame_ready(struct gspca_dev *gspca_dev, struct file *file,
1835                         enum v4l2_memory memory)
1836 {
1837         int ret;
1838
1839         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1840                 return -ERESTARTSYS;
1841         ret = frame_ready_nolock(gspca_dev, file, memory);
1842         mutex_unlock(&gspca_dev->queue_lock);
1843         return ret;
1844 }
1845
1846 /*
1847  * dequeue a video buffer
1848  *
1849  * If nonblock_ing is false, block until a buffer is available.
1850  */
1851 static int vidioc_dqbuf(struct file *file, void *priv,
1852                         struct v4l2_buffer *v4l2_buf)
1853 {
1854         struct gspca_dev *gspca_dev = priv;
1855         struct gspca_frame *frame;
1856         int i, j, ret;
1857
1858         PDEBUG(D_FRAM, "dqbuf");
1859
1860         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1861                 return -ERESTARTSYS;
1862
1863         for (;;) {
1864                 ret = frame_ready_nolock(gspca_dev, file, v4l2_buf->memory);
1865                 if (ret < 0)
1866                         goto out;
1867                 if (ret > 0)
1868                         break;
1869
1870                 mutex_unlock(&gspca_dev->queue_lock);
1871
1872                 if (file->f_flags & O_NONBLOCK)
1873                         return -EAGAIN;
1874
1875                 /* wait till a frame is ready */
1876                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1877                         frame_ready(gspca_dev, file, v4l2_buf->memory),
1878                         msecs_to_jiffies(3000));
1879                 if (ret < 0)
1880                         return ret;
1881                 if (ret == 0)
1882                         return -EIO;
1883
1884                 if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1885                         return -ERESTARTSYS;
1886         }
1887
1888         i = gspca_dev->fr_o;
1889         j = gspca_dev->fr_queue[i];
1890         frame = &gspca_dev->frame[j];
1891
1892         gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1893
1894         if (gspca_dev->sd_desc->dq_callback) {
1895                 mutex_lock(&gspca_dev->usb_lock);
1896                 gspca_dev->usb_err = 0;
1897                 if (gspca_dev->present)
1898                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1899                 mutex_unlock(&gspca_dev->usb_lock);
1900         }
1901
1902         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1903         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1904         PDEBUG(D_FRAM, "dqbuf %d", j);
1905         ret = 0;
1906
1907         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1908                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1909                                  frame->data,
1910                                  frame->v4l2_buf.bytesused)) {
1911                         PDEBUG(D_ERR|D_STREAM,
1912                                 "dqbuf cp to user failed");
1913                         ret = -EFAULT;
1914                 }
1915         }
1916 out:
1917         mutex_unlock(&gspca_dev->queue_lock);
1918         return ret;
1919 }
1920
1921 /*
1922  * queue a video buffer
1923  *
1924  * Attempting to queue a buffer that has already been
1925  * queued will return -EINVAL.
1926  */
1927 static int vidioc_qbuf(struct file *file, void *priv,
1928                         struct v4l2_buffer *v4l2_buf)
1929 {
1930         struct gspca_dev *gspca_dev = priv;
1931         struct gspca_frame *frame;
1932         int i, index, ret;
1933
1934         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1935
1936         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1937                 return -ERESTARTSYS;
1938
1939         index = v4l2_buf->index;
1940         if ((unsigned) index >= gspca_dev->nframes) {
1941                 PDEBUG(D_FRAM,
1942                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1943                 ret = -EINVAL;
1944                 goto out;
1945         }
1946         if (v4l2_buf->memory != gspca_dev->memory) {
1947                 PDEBUG(D_FRAM, "qbuf bad memory type");
1948                 ret = -EINVAL;
1949                 goto out;
1950         }
1951
1952         frame = &gspca_dev->frame[index];
1953         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1954                 PDEBUG(D_FRAM, "qbuf bad state");
1955                 ret = -EINVAL;
1956                 goto out;
1957         }
1958
1959         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1960
1961         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1962                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1963                 frame->v4l2_buf.length = v4l2_buf->length;
1964         }
1965
1966         /* put the buffer in the 'queued' queue */
1967         i = atomic_read(&gspca_dev->fr_q);
1968         gspca_dev->fr_queue[i] = index;
1969         atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1970
1971         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1972         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1973         ret = 0;
1974 out:
1975         mutex_unlock(&gspca_dev->queue_lock);
1976         return ret;
1977 }
1978
1979 /*
1980  * allocate the resources for read()
1981  */
1982 static int read_alloc(struct gspca_dev *gspca_dev,
1983                         struct file *file)
1984 {
1985         struct v4l2_buffer v4l2_buf;
1986         int i, ret;
1987
1988         PDEBUG(D_STREAM, "read alloc");
1989         if (gspca_dev->nframes == 0) {
1990                 struct v4l2_requestbuffers rb;
1991
1992                 memset(&rb, 0, sizeof rb);
1993                 rb.count = gspca_dev->nbufread;
1994                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1995                 rb.memory = GSPCA_MEMORY_READ;
1996                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1997                 if (ret != 0) {
1998                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1999                         return ret;
2000                 }
2001                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2002                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2003                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2004                 for (i = 0; i < gspca_dev->nbufread; i++) {
2005                         v4l2_buf.index = i;
2006                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2007                         if (ret != 0) {
2008                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
2009                                 return ret;
2010                         }
2011                 }
2012                 gspca_dev->memory = GSPCA_MEMORY_READ;
2013         }
2014
2015         /* start streaming */
2016         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2017         if (ret != 0)
2018                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2019         return ret;
2020 }
2021
2022 static unsigned int dev_poll(struct file *file, poll_table *wait)
2023 {
2024         struct gspca_dev *gspca_dev = file->private_data;
2025         int ret;
2026
2027         PDEBUG(D_FRAM, "poll");
2028
2029         poll_wait(file, &gspca_dev->wq, wait);
2030
2031         /* if reqbufs is not done, the user would use read() */
2032         if (gspca_dev->memory == GSPCA_MEMORY_NO) {
2033                 ret = read_alloc(gspca_dev, file);
2034                 if (ret != 0)
2035                         return POLLERR;
2036         }
2037
2038         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2039                 return POLLERR;
2040
2041         /* check if an image has been received */
2042         if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
2043                 ret = POLLIN | POLLRDNORM;      /* yes */
2044         else
2045                 ret = 0;
2046         mutex_unlock(&gspca_dev->queue_lock);
2047         if (!gspca_dev->present)
2048                 return POLLHUP;
2049         return ret;
2050 }
2051
2052 static ssize_t dev_read(struct file *file, char __user *data,
2053                     size_t count, loff_t *ppos)
2054 {
2055         struct gspca_dev *gspca_dev = file->private_data;
2056         struct gspca_frame *frame;
2057         struct v4l2_buffer v4l2_buf;
2058         struct timeval timestamp;
2059         int n, ret, ret2;
2060
2061         PDEBUG(D_FRAM, "read (%zd)", count);
2062         if (!gspca_dev->present)
2063                 return -ENODEV;
2064         if (gspca_dev->memory == GSPCA_MEMORY_NO) { /* first time ? */
2065                 ret = read_alloc(gspca_dev, file);
2066                 if (ret != 0)
2067                         return ret;
2068         }
2069
2070         /* get a frame */
2071         timestamp = ktime_to_timeval(ktime_get());
2072         timestamp.tv_sec--;
2073         n = 2;
2074         for (;;) {
2075                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2076                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2077                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2078                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2079                 if (ret != 0) {
2080                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2081                         return ret;
2082                 }
2083
2084                 /* if the process slept for more than 1 second,
2085                  * get a newer frame */
2086                 frame = &gspca_dev->frame[v4l2_buf.index];
2087                 if (--n < 0)
2088                         break;                  /* avoid infinite loop */
2089                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2090                         break;
2091                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2092                 if (ret != 0) {
2093                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2094                         return ret;
2095                 }
2096         }
2097
2098         /* copy the frame */
2099         if (count > frame->v4l2_buf.bytesused)
2100                 count = frame->v4l2_buf.bytesused;
2101         ret = copy_to_user(data, frame->data, count);
2102         if (ret != 0) {
2103                 PDEBUG(D_ERR|D_STREAM,
2104                         "read cp to user lack %d / %zd", ret, count);
2105                 ret = -EFAULT;
2106                 goto out;
2107         }
2108         ret = count;
2109 out:
2110         /* in each case, requeue the buffer */
2111         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2112         if (ret2 != 0)
2113                 return ret2;
2114         return ret;
2115 }
2116
2117 static struct v4l2_file_operations dev_fops = {
2118         .owner = THIS_MODULE,
2119         .open = dev_open,
2120         .release = dev_close,
2121         .read = dev_read,
2122         .mmap = dev_mmap,
2123         .unlocked_ioctl = video_ioctl2,
2124         .poll   = dev_poll,
2125 };
2126
2127 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2128         .vidioc_querycap        = vidioc_querycap,
2129         .vidioc_dqbuf           = vidioc_dqbuf,
2130         .vidioc_qbuf            = vidioc_qbuf,
2131         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2132         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2133         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2134         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2135         .vidioc_streamon        = vidioc_streamon,
2136         .vidioc_queryctrl       = vidioc_queryctrl,
2137         .vidioc_g_ctrl          = vidioc_g_ctrl,
2138         .vidioc_s_ctrl          = vidioc_s_ctrl,
2139         .vidioc_querymenu       = vidioc_querymenu,
2140         .vidioc_enum_input      = vidioc_enum_input,
2141         .vidioc_g_input         = vidioc_g_input,
2142         .vidioc_s_input         = vidioc_s_input,
2143         .vidioc_reqbufs         = vidioc_reqbufs,
2144         .vidioc_querybuf        = vidioc_querybuf,
2145         .vidioc_streamoff       = vidioc_streamoff,
2146         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2147         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2148         .vidioc_g_parm          = vidioc_g_parm,
2149         .vidioc_s_parm          = vidioc_s_parm,
2150         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2151         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2152 #ifdef CONFIG_VIDEO_ADV_DEBUG
2153         .vidioc_g_register      = vidioc_g_register,
2154         .vidioc_s_register      = vidioc_s_register,
2155 #endif
2156         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2157 };
2158
2159 static const struct video_device gspca_template = {
2160         .name = "gspca main driver",
2161         .fops = &dev_fops,
2162         .ioctl_ops = &dev_ioctl_ops,
2163         .release = gspca_release,
2164 };
2165
2166 /* initialize the controls */
2167 static void ctrls_init(struct gspca_dev *gspca_dev)
2168 {
2169         struct gspca_ctrl *ctrl;
2170         int i;
2171
2172         for (i = 0, ctrl = gspca_dev->cam.ctrls;
2173              i < gspca_dev->sd_desc->nctrls;
2174              i++, ctrl++) {
2175                 ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
2176                 ctrl->val = ctrl->def;
2177                 ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
2178                 ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
2179         }
2180 }
2181
2182 /*
2183  * probe and create a new gspca device
2184  *
2185  * This function must be called by the sub-driver when it is
2186  * called for probing a new device.
2187  */
2188 int gspca_dev_probe2(struct usb_interface *intf,
2189                 const struct usb_device_id *id,
2190                 const struct sd_desc *sd_desc,
2191                 int dev_size,
2192                 struct module *module)
2193 {
2194         struct gspca_dev *gspca_dev;
2195         struct usb_device *dev = interface_to_usbdev(intf);
2196         int ret;
2197
2198         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2199
2200         /* create the device */
2201         if (dev_size < sizeof *gspca_dev)
2202                 dev_size = sizeof *gspca_dev;
2203         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2204         if (!gspca_dev) {
2205                 err("couldn't kzalloc gspca struct");
2206                 return -ENOMEM;
2207         }
2208         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2209         if (!gspca_dev->usb_buf) {
2210                 err("out of memory");
2211                 ret = -ENOMEM;
2212                 goto out;
2213         }
2214         gspca_dev->dev = dev;
2215         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2216         gspca_dev->nbalt = intf->num_altsetting;
2217
2218         /* check if any audio device */
2219         if (dev->config->desc.bNumInterfaces != 1) {
2220                 int i;
2221                 struct usb_interface *intf2;
2222
2223                 for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
2224                         intf2 = dev->config->interface[i];
2225                         if (intf2 != NULL
2226                          && intf2->altsetting != NULL
2227                          && intf2->altsetting->desc.bInterfaceClass ==
2228                                          USB_CLASS_AUDIO) {
2229                                 gspca_dev->audio = 1;
2230                                 break;
2231                         }
2232                 }
2233         }
2234
2235         gspca_dev->sd_desc = sd_desc;
2236         gspca_dev->nbufread = 2;
2237         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2238
2239         /* configure the subdriver and initialize the USB device */
2240         ret = sd_desc->config(gspca_dev, id);
2241         if (ret < 0)
2242                 goto out;
2243         if (gspca_dev->cam.ctrls != NULL)
2244                 ctrls_init(gspca_dev);
2245         ret = sd_desc->init(gspca_dev);
2246         if (ret < 0)
2247                 goto out;
2248         gspca_set_default_mode(gspca_dev);
2249
2250         ret = gspca_input_connect(gspca_dev);
2251         if (ret)
2252                 goto out;
2253
2254         mutex_init(&gspca_dev->usb_lock);
2255         mutex_init(&gspca_dev->queue_lock);
2256         init_waitqueue_head(&gspca_dev->wq);
2257
2258         /* init video stuff */
2259         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2260         gspca_dev->vdev.parent = &intf->dev;
2261         gspca_dev->module = module;
2262         gspca_dev->present = 1;
2263         ret = video_register_device(&gspca_dev->vdev,
2264                                   VFL_TYPE_GRABBER,
2265                                   -1);
2266         if (ret < 0) {
2267                 err("video_register_device err %d", ret);
2268                 goto out;
2269         }
2270
2271         usb_set_intfdata(intf, gspca_dev);
2272         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2273
2274         gspca_input_create_urb(gspca_dev);
2275
2276         return 0;
2277 out:
2278 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2279         if (gspca_dev->input_dev)
2280                 input_unregister_device(gspca_dev->input_dev);
2281 #endif
2282         kfree(gspca_dev->usb_buf);
2283         kfree(gspca_dev);
2284         return ret;
2285 }
2286 EXPORT_SYMBOL(gspca_dev_probe2);
2287
2288 /* same function as the previous one, but check the interface */
2289 int gspca_dev_probe(struct usb_interface *intf,
2290                 const struct usb_device_id *id,
2291                 const struct sd_desc *sd_desc,
2292                 int dev_size,
2293                 struct module *module)
2294 {
2295         struct usb_device *dev = interface_to_usbdev(intf);
2296
2297         /* we don't handle multi-config cameras */
2298         if (dev->descriptor.bNumConfigurations != 1) {
2299                 err("%04x:%04x too many config",
2300                                 id->idVendor, id->idProduct);
2301                 return -ENODEV;
2302         }
2303
2304         /* the USB video interface must be the first one */
2305         if (dev->config->desc.bNumInterfaces != 1
2306          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2307                 return -ENODEV;
2308
2309         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2310 }
2311 EXPORT_SYMBOL(gspca_dev_probe);
2312
2313 /*
2314  * USB disconnection
2315  *
2316  * This function must be called by the sub-driver
2317  * when the device disconnects, after the specific resources are freed.
2318  */
2319 void gspca_disconnect(struct usb_interface *intf)
2320 {
2321         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2322 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2323         struct input_dev *input_dev;
2324 #endif
2325
2326         PDEBUG(D_PROBE, "%s disconnect",
2327                 video_device_node_name(&gspca_dev->vdev));
2328         mutex_lock(&gspca_dev->usb_lock);
2329
2330         gspca_dev->present = 0;
2331         wake_up_interruptible(&gspca_dev->wq);
2332
2333         destroy_urbs(gspca_dev);
2334
2335 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2336         gspca_input_destroy_urb(gspca_dev);
2337         input_dev = gspca_dev->input_dev;
2338         if (input_dev) {
2339                 gspca_dev->input_dev = NULL;
2340                 input_unregister_device(input_dev);
2341         }
2342 #endif
2343
2344         /* the device is freed at exit of this function */
2345         gspca_dev->dev = NULL;
2346         mutex_unlock(&gspca_dev->usb_lock);
2347
2348         usb_set_intfdata(intf, NULL);
2349
2350         /* release the device */
2351         /* (this will call gspca_release() immediately or on last close) */
2352         video_unregister_device(&gspca_dev->vdev);
2353
2354 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2355 }
2356 EXPORT_SYMBOL(gspca_disconnect);
2357
2358 #ifdef CONFIG_PM
2359 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2360 {
2361         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2362
2363         if (!gspca_dev->streaming)
2364                 return 0;
2365         gspca_dev->frozen = 1;          /* avoid urb error messages */
2366         if (gspca_dev->sd_desc->stopN)
2367                 gspca_dev->sd_desc->stopN(gspca_dev);
2368         destroy_urbs(gspca_dev);
2369         gspca_input_destroy_urb(gspca_dev);
2370         gspca_set_alt0(gspca_dev);
2371         if (gspca_dev->sd_desc->stop0)
2372                 gspca_dev->sd_desc->stop0(gspca_dev);
2373         return 0;
2374 }
2375 EXPORT_SYMBOL(gspca_suspend);
2376
2377 int gspca_resume(struct usb_interface *intf)
2378 {
2379         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2380
2381         gspca_dev->frozen = 0;
2382         gspca_dev->sd_desc->init(gspca_dev);
2383         gspca_input_create_urb(gspca_dev);
2384         if (gspca_dev->streaming)
2385                 return gspca_init_transfer(gspca_dev);
2386         return 0;
2387 }
2388 EXPORT_SYMBOL(gspca_resume);
2389 #endif
2390 /* -- cam driver utility functions -- */
2391
2392 /* auto gain and exposure algorithm based on the knee algorithm described here:
2393    http://ytse.tricolour.net/docs/LowLightOptimization.html
2394
2395    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2396    where changed. */
2397 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2398         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2399 {
2400         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2401         const struct ctrl *gain_ctrl = NULL;
2402         const struct ctrl *exposure_ctrl = NULL;
2403         const struct ctrl *autogain_ctrl = NULL;
2404         int retval = 0;
2405
2406         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2407                 if (gspca_dev->ctrl_dis & (1 << i))
2408                         continue;
2409                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2410                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2411                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2412                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2413                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2414                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2415         }
2416         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2417                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2418                         "on cam without (auto)gain/exposure");
2419                 return 0;
2420         }
2421
2422         if (gain_ctrl->get(gspca_dev, &gain) ||
2423                         exposure_ctrl->get(gspca_dev, &exposure) ||
2424                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2425                 return 0;
2426
2427         orig_gain = gain;
2428         orig_exposure = exposure;
2429
2430         /* If we are of a multiple of deadzone, do multiple steps to reach the
2431            desired lumination fast (with the risc of a slight overshoot) */
2432         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2433
2434         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2435                 avg_lum, desired_avg_lum, steps);
2436
2437         for (i = 0; i < steps; i++) {
2438                 if (avg_lum > desired_avg_lum) {
2439                         if (gain > gain_knee)
2440                                 gain--;
2441                         else if (exposure > exposure_knee)
2442                                 exposure--;
2443                         else if (gain > gain_ctrl->qctrl.default_value)
2444                                 gain--;
2445                         else if (exposure > exposure_ctrl->qctrl.minimum)
2446                                 exposure--;
2447                         else if (gain > gain_ctrl->qctrl.minimum)
2448                                 gain--;
2449                         else
2450                                 break;
2451                 } else {
2452                         if (gain < gain_ctrl->qctrl.default_value)
2453                                 gain++;
2454                         else if (exposure < exposure_knee)
2455                                 exposure++;
2456                         else if (gain < gain_knee)
2457                                 gain++;
2458                         else if (exposure < exposure_ctrl->qctrl.maximum)
2459                                 exposure++;
2460                         else if (gain < gain_ctrl->qctrl.maximum)
2461                                 gain++;
2462                         else
2463                                 break;
2464                 }
2465         }
2466
2467         if (gain != orig_gain) {
2468                 gain_ctrl->set(gspca_dev, gain);
2469                 retval = 1;
2470         }
2471         if (exposure != orig_exposure) {
2472                 exposure_ctrl->set(gspca_dev, exposure);
2473                 retval = 1;
2474         }
2475
2476         return retval;
2477 }
2478 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2479
2480 /* -- module insert / remove -- */
2481 static int __init gspca_init(void)
2482 {
2483         info("v" DRIVER_VERSION_NUMBER " registered");
2484         return 0;
2485 }
2486 static void __exit gspca_exit(void)
2487 {
2488 }
2489
2490 module_init(gspca_init);
2491 module_exit(gspca_exit);
2492
2493 #ifdef GSPCA_DEBUG
2494 module_param_named(debug, gspca_debug, int, 0644);
2495 MODULE_PARM_DESC(debug,
2496                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2497                 " 0x08:stream 0x10:frame 0x20:packet"
2498                 " 0x0100: v4l2");
2499 #endif