drivers/media/video/gspca/gspca.c

   1 /*
   2  * Main USB camera driver
   3  *
   4  * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
   5  *
   6  * Camera button input handling by Márton Németh
   7  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define MODULE_NAME "gspca"
  25
  26 #include <linux/init.h>
  27 #include <linux/version.h>
  28 #include <linux/fs.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/sched.h>
  31 #include <linux/slab.h>
  32 #include <linux/mm.h>
  33 #include <linux/string.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/io.h>
  36 #include <asm/page.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/ktime.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 #include "gspca.h"
  42
  43 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
  44 #include <linux/input.h>
  45 #include <linux/usb/input.h>
  46 #endif
  47
  48 /* global values */
  49 #define DEF_NURBS 3             /* default number of URBs */
  50 #if DEF_NURBS > MAX_NURBS
  51 #error "DEF_NURBS too big"
  52 #endif
  53
  54 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  55 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  56 MODULE_LICENSE("GPL");
  57
  58 #define DRIVER_VERSION_NUMBER   KERNEL_VERSION(2, 9, 0)
  59
  60 #ifdef GSPCA_DEBUG
  61 int gspca_debug = D_ERR | D_PROBE;
  62 EXPORT_SYMBOL(gspca_debug);
  63
  64 static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h)
  65 {
  66         if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  67                 PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d",
  68                         txt,
  69                         pixfmt & 0xff,
  70                         (pixfmt >> 8) & 0xff,
  71                         (pixfmt >> 16) & 0xff,
  72                         pixfmt >> 24,
  73                         w, h);
  74         } else {
  75                 PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d",
  76                         txt,
  77                         pixfmt,
  78                         w, h);
  79         }
  80 }
  81 #else
  82 #define PDEBUG_MODE(txt, pixfmt, w, h)
  83 #endif
  84
  85 /* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  86 #define GSPCA_MEMORY_NO 0       /* V4L2_MEMORY_xxx starts from 1 */
  87 #define GSPCA_MEMORY_READ 7
  88
  89 #define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)
  90
  91 /*
  92  * VMA operations.
  93  */
  94 static void gspca_vm_open(struct vm_area_struct *vma)
  95 {
  96         struct gspca_frame *frame = vma->vm_private_data;
  97
  98         frame->vma_use_count++;
  99         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED;
 100 }
 101
 102 static void gspca_vm_close(struct vm_area_struct *vma)
 103 {
 104         struct gspca_frame *frame = vma->vm_private_data;
 105
 106         if (--frame->vma_use_count <= 0)
 107                 frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 108 }
 109
 110 static const struct vm_operations_struct gspca_vm_ops = {
 111         .open           = gspca_vm_open,
 112         .close          = gspca_vm_close,
 113 };
 114
 115 /*
 116  * Input and interrupt endpoint handling functions
 117  */
 118 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
 119 static void int_irq(struct urb *urb)
 120 {
 121         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 122         int ret;
 123
 124         ret = urb->status;
 125         switch (ret) {
 126         case 0:
 127                 if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
 128                     urb->transfer_buffer, urb->actual_length) < 0) {
 129                         PDEBUG(D_ERR, "Unknown packet received");
 130                 }
 131                 break;
 132
 133         case -ENOENT:
 134         case -ECONNRESET:
 135         case -ENODEV:
 136         case -ESHUTDOWN:
 137                 /* Stop is requested either by software or hardware is gone,
 138                  * keep the ret value non-zero and don't resubmit later.
 139                  */
 140                 break;
 141
 142         default:
 143                 PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
 144                 urb->status = 0;
 145                 ret = 0;
 146         }
 147
 148         if (ret == 0) {
 149                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 150                 if (ret < 0)
 151                         PDEBUG(D_ERR, "Resubmit URB failed with error %i", ret);
 152         }
 153 }
 154
 155 static int gspca_input_connect(struct gspca_dev *dev)
 156 {
 157         struct input_dev *input_dev;
 158         int err = 0;
 159
 160         dev->input_dev = NULL;
 161         if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 162                 input_dev = input_allocate_device();
 163                 if (!input_dev)
 164                         return -ENOMEM;
 165
 166                 usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 167                 strlcat(dev->phys, "/input0", sizeof(dev->phys));
 168
 169                 input_dev->name = dev->sd_desc->name;
 170                 input_dev->phys = dev->phys;
 171
 172                 usb_to_input_id(dev->dev, &input_dev->id);
 173
 174                 input_dev->evbit[0] = BIT_MASK(EV_KEY);
 175                 input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 176                 input_dev->dev.parent = &dev->dev->dev;
 177
 178                 err = input_register_device(input_dev);
 179                 if (err) {
 180                         PDEBUG(D_ERR, "Input device registration failed "
 181                                 "with error %i", err);
 182                         input_dev->dev.parent = NULL;
 183                         input_free_device(input_dev);
 184                 } else {
 185                         dev->input_dev = input_dev;
 186                 }
 187         }
 188
 189         return err;
 190 }
 191
 192 static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 193                           struct usb_endpoint_descriptor *ep)
 194 {
 195         unsigned int buffer_len;
 196         int interval;
 197         struct urb *urb;
 198         struct usb_device *dev;
 199         void *buffer = NULL;
 200         int ret = -EINVAL;
 201
 202         buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 203         interval = ep->bInterval;
 204         PDEBUG(D_PROBE, "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         gspca_dev->int_urb = urb;
 227         ret = usb_submit_urb(urb, GFP_KERNEL);
 228         if (ret < 0) {
 229                 PDEBUG(D_ERR, "submit URB failed with error %i", ret);
 230                 goto error_submit;
 231         }
 232         return ret;
 233
 234 error_submit:
 235         usb_free_coherent(dev,
 236                           urb->transfer_buffer_length,
 237                           urb->transfer_buffer,
 238                           urb->transfer_dma);
 239 error_buffer:
 240         usb_free_urb(urb);
 241 error:
 242         return ret;
 243 }
 244
 245 static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 246 {
 247         struct usb_interface *intf;
 248         struct usb_host_interface *intf_desc;
 249         struct usb_endpoint_descriptor *ep;
 250         int i;
 251
 252         if (gspca_dev->sd_desc->int_pkt_scan)  {
 253                 intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 254                 intf_desc = intf->cur_altsetting;
 255                 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 256                         ep = &intf_desc->endpoint[i].desc;
 257                         if (usb_endpoint_dir_in(ep) &&
 258                             usb_endpoint_xfer_int(ep)) {
 259
 260                                 alloc_and_submit_int_urb(gspca_dev, ep);
 261                                 break;
 262                         }
 263                 }
 264         }
 265 }
 266
 267 static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 268 {
 269         struct urb *urb;
 270
 271         urb = gspca_dev->int_urb;
 272         if (urb) {
 273                 gspca_dev->int_urb = NULL;
 274                 usb_kill_urb(urb);
 275                 usb_free_coherent(gspca_dev->dev,
 276                                   urb->transfer_buffer_length,
 277                                   urb->transfer_buffer,
 278                                   urb->transfer_dma);
 279                 usb_free_urb(urb);
 280         }
 281 }
 282 #else
 283 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 284 {
 285 }
 286
 287 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 288 {
 289 }
 290
 291 static inline int gspca_input_connect(struct gspca_dev *dev)
 292 {
 293         return 0;
 294 }
 295 #endif
 296
 297 /*
 298  * fill a video frame from an URB and resubmit
 299  */
 300 static void fill_frame(struct gspca_dev *gspca_dev,
 301                         struct urb *urb)
 302 {
 303         u8 *data;               /* address of data in the iso message */
 304         int i, len, st;
 305         cam_pkt_op pkt_scan;
 306
 307         if (urb->status != 0) {
 308                 if (urb->status == -ESHUTDOWN)
 309                         return;         /* disconnection */
 310 #ifdef CONFIG_PM
 311                 if (gspca_dev->frozen)
 312                         return;
 313 #endif
 314                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 315                 urb->status = 0;
 316                 goto resubmit;
 317         }
 318         if (gspca_dev->image == NULL)
 319                 gspca_dev->last_packet_type = DISCARD_PACKET;
 320         pkt_scan = gspca_dev->sd_desc->pkt_scan;
 321         for (i = 0; i < urb->number_of_packets; i++) {
 322
 323                 /* check the packet status and length */
 324                 len = urb->iso_frame_desc[i].actual_length;
 325                 if (len == 0) {
 326                         if (gspca_dev->empty_packet == 0)
 327                                 gspca_dev->empty_packet = 1;
 328                         continue;
 329                 }
 330                 st = urb->iso_frame_desc[i].status;
 331                 if (st) {
 332                         PDEBUG(D_ERR,
 333                                 "ISOC data error: [%d] len=%d, status=%d",
 334                                 i, len, st);
 335                         gspca_dev->last_packet_type = DISCARD_PACKET;
 336                         continue;
 337                 }
 338
 339                 /* let the packet be analyzed by the subdriver */
 340                 PDEBUG(D_PACK, "packet [%d] o:%d l:%d",
 341                         i, urb->iso_frame_desc[i].offset, len);
 342                 data = (u8 *) urb->transfer_buffer
 343                                         + urb->iso_frame_desc[i].offset;
 344                 pkt_scan(gspca_dev, data, len);
 345         }
 346
 347 resubmit:
 348         /* resubmit the URB */
 349         st = usb_submit_urb(urb, GFP_ATOMIC);
 350         if (st < 0)
 351                 PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 352 }
 353
 354 /*
 355  * ISOC message interrupt from the USB device
 356  *
 357  * Analyse each packet and call the subdriver for copy to the frame buffer.
 358  */
 359 static void isoc_irq(struct urb *urb)
 360 {
 361         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 362
 363         PDEBUG(D_PACK, "isoc irq");
 364         if (!gspca_dev->streaming)
 365                 return;
 366         fill_frame(gspca_dev, urb);
 367 }
 368
 369 /*
 370  * bulk message interrupt from the USB device
 371  */
 372 static void bulk_irq(struct urb *urb)
 373 {
 374         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 375         int st;
 376
 377         PDEBUG(D_PACK, "bulk irq");
 378         if (!gspca_dev->streaming)
 379                 return;
 380         switch (urb->status) {
 381         case 0:
 382                 break;
 383         case -ESHUTDOWN:
 384                 return;         /* disconnection */
 385         default:
 386 #ifdef CONFIG_PM
 387                 if (gspca_dev->frozen)
 388                         return;
 389 #endif
 390                 PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
 391                 urb->status = 0;
 392                 goto resubmit;
 393         }
 394
 395         PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
 396         gspca_dev->sd_desc->pkt_scan(gspca_dev,
 397                                 urb->transfer_buffer,
 398                                 urb->actual_length);
 399
 400 resubmit:
 401         /* resubmit the URB */
 402         if (gspca_dev->cam.bulk_nurbs != 0) {
 403                 st = usb_submit_urb(urb, GFP_ATOMIC);
 404                 if (st < 0)
 405                         PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
 406         }
 407 }
 408
 409 /*
 410  * add data to the current frame
 411  *
 412  * This function is called by the subdrivers at interrupt level.
 413  *
 414  * To build a frame, these ones must add
 415  *      - one FIRST_PACKET
 416  *      - 0 or many INTER_PACKETs
 417  *      - one LAST_PACKET
 418  * DISCARD_PACKET invalidates the whole frame.
 419  * On LAST_PACKET, a new frame is returned.
 420  */
 421 void gspca_frame_add(struct gspca_dev *gspca_dev,
 422                         enum gspca_packet_type packet_type,
 423                         const u8 *data,
 424                         int len)
 425 {
 426         struct gspca_frame *frame;
 427         int i, j;
 428
 429         PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 430
 431         /* check the availability of the frame buffer */
 432         if (gspca_dev->image == NULL)
 433                 return;
 434
 435         if (packet_type == FIRST_PACKET) {
 436                 i = gspca_dev->fr_i;
 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_len = 0;
 442         } else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 443                 if (packet_type == LAST_PACKET)
 444                         gspca_dev->last_packet_type = packet_type;
 445                 return;
 446         }
 447
 448         /* append the packet to the frame buffer */
 449         if (len > 0) {
 450                 if (gspca_dev->image_len + len > gspca_dev->frsz) {
 451                         PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
 452                                 gspca_dev->image_len + len,
 453                                 gspca_dev->frsz);
 454                         packet_type = DISCARD_PACKET;
 455                 } else {
 456                         memcpy(gspca_dev->image + gspca_dev->image_len,
 457                                 data, len);
 458                         gspca_dev->image_len += len;
 459                 }
 460         }
 461         gspca_dev->last_packet_type = packet_type;
 462
 463         /* if last packet, wake up the application and advance in the queue */
 464         if (packet_type == LAST_PACKET) {
 465                 i = gspca_dev->fr_i;
 466                 j = gspca_dev->fr_queue[i];
 467                 frame = &gspca_dev->frame[j];
 468                 frame->v4l2_buf.bytesused = gspca_dev->image_len;
 469                 frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 470                                          | V4L2_BUF_FLAG_DONE)
 471                                         & ~V4L2_BUF_FLAG_QUEUED;
 472                 wake_up_interruptible(&gspca_dev->wq);  /* event = new frame */
 473                 i = (i + 1) % gspca_dev->nframes;
 474                 gspca_dev->fr_i = i;
 475                 PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
 476                         frame->v4l2_buf.bytesused,
 477                         gspca_dev->fr_q,
 478                         i,
 479                         gspca_dev->fr_o);
 480                 j = gspca_dev->fr_queue[i];
 481                 frame = &gspca_dev->frame[j];
 482                 if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
 483                                         == V4L2_BUF_FLAG_QUEUED) {
 484                         gspca_dev->image = frame->data;
 485                 } else {
 486                         gspca_dev->image = NULL;
 487                 }
 488         }
 489 }
 490 EXPORT_SYMBOL(gspca_frame_add);
 491
 492 static int gspca_is_compressed(__u32 format)
 493 {
 494         switch (format) {
 495         case V4L2_PIX_FMT_MJPEG:
 496         case V4L2_PIX_FMT_JPEG:
 497         case V4L2_PIX_FMT_SPCA561:
 498         case V4L2_PIX_FMT_PAC207:
 499         case V4L2_PIX_FMT_MR97310A:
 500                 return 1;
 501         }
 502         return 0;
 503 }
 504
 505 static int frame_alloc(struct gspca_dev *gspca_dev,
 506                         unsigned int count)
 507 {
 508         struct gspca_frame *frame;
 509         unsigned int frsz;
 510         int i;
 511
 512         i = gspca_dev->curr_mode;
 513         frsz = gspca_dev->cam.cam_mode[i].sizeimage;
 514         PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 515         frsz = PAGE_ALIGN(frsz);
 516         gspca_dev->frsz = frsz;
 517         if (count > GSPCA_MAX_FRAMES)
 518                 count = GSPCA_MAX_FRAMES;
 519         gspca_dev->frbuf = vmalloc_32(frsz * count);
 520         if (!gspca_dev->frbuf) {
 521                 err("frame alloc failed");
 522                 return -ENOMEM;
 523         }
 524         gspca_dev->nframes = count;
 525         for (i = 0; i < count; i++) {
 526                 frame = &gspca_dev->frame[i];
 527                 frame->v4l2_buf.index = i;
 528                 frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 529                 frame->v4l2_buf.flags = 0;
 530                 frame->v4l2_buf.field = V4L2_FIELD_NONE;
 531                 frame->v4l2_buf.length = frsz;
 532                 frame->v4l2_buf.memory = gspca_dev->memory;
 533                 frame->v4l2_buf.sequence = 0;
 534                 frame->data = gspca_dev->frbuf + i * frsz;
 535                 frame->v4l2_buf.m.offset = i * frsz;
 536         }
 537         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
 538         gspca_dev->image = NULL;
 539         gspca_dev->image_len = 0;
 540         gspca_dev->last_packet_type = DISCARD_PACKET;
 541         gspca_dev->sequence = 0;
 542         return 0;
 543 }
 544
 545 static void frame_free(struct gspca_dev *gspca_dev)
 546 {
 547         int i;
 548
 549         PDEBUG(D_STREAM, "frame free");
 550         if (gspca_dev->frbuf != NULL) {
 551                 vfree(gspca_dev->frbuf);
 552                 gspca_dev->frbuf = NULL;
 553                 for (i = 0; i < gspca_dev->nframes; i++)
 554                         gspca_dev->frame[i].data = NULL;
 555         }
 556         gspca_dev->nframes = 0;
 557 }
 558
 559 static void destroy_urbs(struct gspca_dev *gspca_dev)
 560 {
 561         struct urb *urb;
 562         unsigned int i;
 563
 564         PDEBUG(D_STREAM, "kill transfer");
 565         for (i = 0; i < MAX_NURBS; i++) {
 566                 urb = gspca_dev->urb[i];
 567                 if (urb == NULL)
 568                         break;
 569
 570                 gspca_dev->urb[i] = NULL;
 571                 usb_kill_urb(urb);
 572                 if (urb->transfer_buffer != NULL)
 573                         usb_free_coherent(gspca_dev->dev,
 574                                           urb->transfer_buffer_length,
 575                                           urb->transfer_buffer,
 576                                           urb->transfer_dma);
 577                 usb_free_urb(urb);
 578         }
 579 }
 580
 581 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 582 {
 583         int ret;
 584
 585         if (gspca_dev->alt == 0)
 586                 return 0;
 587         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 588         if (ret < 0)
 589                 PDEBUG(D_ERR|D_STREAM, "set alt 0 err %d", ret);
 590         return ret;
 591 }
 592
 593 /* Note: both the queue and the usb locks should be held when calling this */
 594 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 595 {
 596         gspca_dev->streaming = 0;
 597         if (gspca_dev->present) {
 598                 if (gspca_dev->sd_desc->stopN)
 599                         gspca_dev->sd_desc->stopN(gspca_dev);
 600                 destroy_urbs(gspca_dev);
 601                 gspca_input_destroy_urb(gspca_dev);
 602                 gspca_set_alt0(gspca_dev);
 603                 gspca_input_create_urb(gspca_dev);
 604         }
 605
 606         /* always call stop0 to free the subdriver's resources */
 607         if (gspca_dev->sd_desc->stop0)
 608                 gspca_dev->sd_desc->stop0(gspca_dev);
 609         PDEBUG(D_STREAM, "stream off OK");
 610 }
 611
 612 /*
 613  * look for an input transfer endpoint in an alternate setting
 614  */
 615 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 616                                           int xfer)
 617 {
 618         struct usb_host_endpoint *ep;
 619         int i, attr;
 620
 621         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 622                 ep = &alt->endpoint[i];
 623                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 624                 if (attr == xfer
 625                     && ep->desc.wMaxPacketSize != 0)
 626                         return ep;
 627         }
 628         return NULL;
 629 }
 630
 631 /*
 632  * look for an input (isoc or bulk) endpoint
 633  *
 634  * The endpoint is defined by the subdriver.
 635  * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep).
 636  * This routine may be called many times when the bandwidth is too small
 637  * (the bandwidth is checked on urb submit).
 638  */
 639 static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
 640 {
 641         struct usb_interface *intf;
 642         struct usb_host_endpoint *ep;
 643         int xfer, i, ret;
 644
 645         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 646         ep = NULL;
 647         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 648                                    : USB_ENDPOINT_XFER_ISOC;
 649         i = gspca_dev->alt;                     /* previous alt setting */
 650         if (gspca_dev->cam.reverse_alts) {
 651                 while (++i < gspca_dev->nbalt) {
 652                         ep = alt_xfer(&intf->altsetting[i], xfer);
 653                         if (ep)
 654                                 break;
 655                 }
 656         } else {
 657                 while (--i >= 0) {
 658                         ep = alt_xfer(&intf->altsetting[i], xfer);
 659                         if (ep)
 660                                 break;
 661                 }
 662         }
 663         if (ep == NULL) {
 664                 err("no transfer endpoint found");
 665                 return NULL;
 666         }
 667         PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
 668                         i, ep->desc.bEndpointAddress);
 669         gspca_dev->alt = i;             /* memorize the current alt setting */
 670         if (gspca_dev->nbalt > 1) {
 671                 gspca_input_destroy_urb(gspca_dev);
 672                 ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
 673                 if (ret < 0) {
 674                         err("set alt %d err %d", i, ret);
 675                         ep = NULL;
 676                 }
 677                 gspca_input_create_urb(gspca_dev);
 678         }
 679         return ep;
 680 }
 681
 682 /*
 683  * create the URBs for image transfer
 684  */
 685 static int create_urbs(struct gspca_dev *gspca_dev,
 686                         struct usb_host_endpoint *ep)
 687 {
 688         struct urb *urb;
 689         int n, nurbs, i, psize, npkt, bsize;
 690
 691         /* calculate the packet size and the number of packets */
 692         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 693
 694         if (!gspca_dev->cam.bulk) {             /* isoc */
 695
 696                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 697                 if (gspca_dev->pkt_size == 0)
 698                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 699                 else
 700                         psize = gspca_dev->pkt_size;
 701                 npkt = gspca_dev->cam.npkt;
 702                 if (npkt == 0)
 703                         npkt = 32;              /* default value */
 704                 bsize = psize * npkt;
 705                 PDEBUG(D_STREAM,
 706                         "isoc %d pkts size %d = bsize:%d",
 707                         npkt, psize, bsize);
 708                 nurbs = DEF_NURBS;
 709         } else {                                /* bulk */
 710                 npkt = 0;
 711                 bsize = gspca_dev->cam.bulk_size;
 712                 if (bsize == 0)
 713                         bsize = psize;
 714                 PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
 715                 if (gspca_dev->cam.bulk_nurbs != 0)
 716                         nurbs = gspca_dev->cam.bulk_nurbs;
 717                 else
 718                         nurbs = 1;
 719         }
 720
 721         for (n = 0; n < nurbs; n++) {
 722                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
 723                 if (!urb) {
 724                         err("usb_alloc_urb failed");
 725                         return -ENOMEM;
 726                 }
 727                 gspca_dev->urb[n] = urb;
 728                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 729                                                 bsize,
 730                                                 GFP_KERNEL,
 731                                                 &urb->transfer_dma);
 732
 733                 if (urb->transfer_buffer == NULL) {
 734                         err("usb_alloc_coherent failed");
 735                         return -ENOMEM;
 736                 }
 737                 urb->dev = gspca_dev->dev;
 738                 urb->context = gspca_dev;
 739                 urb->transfer_buffer_length = bsize;
 740                 if (npkt != 0) {                /* ISOC */
 741                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 742                                                     ep->desc.bEndpointAddress);
 743                         urb->transfer_flags = URB_ISO_ASAP
 744                                         | URB_NO_TRANSFER_DMA_MAP;
 745                         urb->interval = ep->desc.bInterval;
 746                         urb->complete = isoc_irq;
 747                         urb->number_of_packets = npkt;
 748                         for (i = 0; i < npkt; i++) {
 749                                 urb->iso_frame_desc[i].length = psize;
 750                                 urb->iso_frame_desc[i].offset = psize * i;
 751                         }
 752                 } else {                /* bulk */
 753                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 754                                                 ep->desc.bEndpointAddress),
 755                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 756                         urb->complete = bulk_irq;
 757                 }
 758         }
 759         return 0;
 760 }
 761
 762 /*
 763  * start the USB transfer
 764  */
 765 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 766 {
 767         struct usb_host_endpoint *ep;
 768         struct urb *urb;
 769         int n, ret;
 770
 771         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 772                 return -ERESTARTSYS;
 773
 774         if (!gspca_dev->present) {
 775                 ret = -ENODEV;
 776                 goto out;
 777         }
 778
 779         gspca_dev->usb_err = 0;
 780
 781         /* set the higher alternate setting and
 782          * loop until urb submit succeeds */
 783         if (gspca_dev->cam.reverse_alts)
 784                 gspca_dev->alt = 0;
 785         else
 786                 gspca_dev->alt = gspca_dev->nbalt;
 787
 788         if (gspca_dev->sd_desc->isoc_init) {
 789                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 790                 if (ret < 0)
 791                         goto out;
 792         }
 793         ep = get_ep(gspca_dev);
 794         if (ep == NULL) {
 795                 ret = -EIO;
 796                 goto out;
 797         }
 798         for (;;) {
 799                 if (!gspca_dev->cam.no_urb_create) {
 800                         PDEBUG(D_STREAM, "init transfer alt %d",
 801                                 gspca_dev->alt);
 802                         ret = create_urbs(gspca_dev, ep);
 803                         if (ret < 0) {
 804                                 destroy_urbs(gspca_dev);
 805                                 goto out;
 806                         }
 807                 }
 808
 809                 /* clear the bulk endpoint */
 810                 if (gspca_dev->cam.bulk)
 811                         usb_clear_halt(gspca_dev->dev,
 812                                         gspca_dev->urb[0]->pipe);
 813
 814                 /* start the cam */
 815                 ret = gspca_dev->sd_desc->start(gspca_dev);
 816                 if (ret < 0) {
 817                         destroy_urbs(gspca_dev);
 818                         goto out;
 819                 }
 820                 gspca_dev->streaming = 1;
 821
 822                 /* some bulk transfers are started by the subdriver */
 823                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 824                         break;
 825
 826                 /* submit the URBs */
 827                 for (n = 0; n < MAX_NURBS; n++) {
 828                         urb = gspca_dev->urb[n];
 829                         if (urb == NULL)
 830                                 break;
 831                         ret = usb_submit_urb(urb, GFP_KERNEL);
 832                         if (ret < 0)
 833                                 break;
 834                 }
 835                 if (ret >= 0)
 836                         break;
 837                 gspca_stream_off(gspca_dev);
 838                 if (ret != -ENOSPC) {
 839                         PDEBUG(D_ERR|D_STREAM,
 840                                 "usb_submit_urb alt %d err %d",
 841                                 gspca_dev->alt, ret);
 842                         goto out;
 843                 }
 844
 845                 /* the bandwidth is not wide enough
 846                  * negociate or try a lower alternate setting */
 847                 PDEBUG(D_ERR|D_STREAM,
 848                         "bandwidth not wide enough - trying again");
 849                 msleep(20);     /* wait for kill complete */
 850                 if (gspca_dev->sd_desc->isoc_nego) {
 851                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 852                         if (ret < 0)
 853                                 goto out;
 854                 } else {
 855                         ep = get_ep(gspca_dev);
 856                         if (ep == NULL) {
 857                                 ret = -EIO;
 858                                 goto out;
 859                         }
 860                 }
 861         }
 862 out:
 863         mutex_unlock(&gspca_dev->usb_lock);
 864         return ret;
 865 }
 866
 867 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 868 {
 869         int i;
 870
 871         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
 872         gspca_dev->curr_mode = i;
 873         gspca_dev->width = gspca_dev->cam.cam_mode[i].width;
 874         gspca_dev->height = gspca_dev->cam.cam_mode[i].height;
 875         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
 876 }
 877
 878 static int wxh_to_mode(struct gspca_dev *gspca_dev,
 879                         int width, int height)
 880 {
 881         int i;
 882
 883         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 884                 if (width >= gspca_dev->cam.cam_mode[i].width
 885                     && height >= gspca_dev->cam.cam_mode[i].height)
 886                         break;
 887         }
 888         return i;
 889 }
 890
 891 /*
 892  * search a mode with the right pixel format
 893  */
 894 static int gspca_get_mode(struct gspca_dev *gspca_dev,
 895                         int mode,
 896                         int pixfmt)
 897 {
 898         int modeU, modeD;
 899
 900         modeU = modeD = mode;
 901         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 902                 if (--modeD >= 0) {
 903                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
 904                                                                 == pixfmt)
 905                                 return modeD;
 906                 }
 907                 if (++modeU < gspca_dev->cam.nmodes) {
 908                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
 909                                                                 == pixfmt)
 910                                 return modeU;
 911                 }
 912         }
 913         return -EINVAL;
 914 }
 915
 916 #ifdef CONFIG_VIDEO_ADV_DEBUG
 917 static int vidioc_g_register(struct file *file, void *priv,
 918                         struct v4l2_dbg_register *reg)
 919 {
 920         int ret;
 921         struct gspca_dev *gspca_dev = priv;
 922
 923         if (!gspca_dev->sd_desc->get_chip_ident)
 924                 return -EINVAL;
 925
 926         if (!gspca_dev->sd_desc->get_register)
 927                 return -EINVAL;
 928
 929         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 930                 return -ERESTARTSYS;
 931         gspca_dev->usb_err = 0;
 932         if (gspca_dev->present)
 933                 ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
 934         else
 935                 ret = -ENODEV;
 936         mutex_unlock(&gspca_dev->usb_lock);
 937
 938         return ret;
 939 }
 940
 941 static int vidioc_s_register(struct file *file, void *priv,
 942                         struct v4l2_dbg_register *reg)
 943 {
 944         int ret;
 945         struct gspca_dev *gspca_dev = priv;
 946
 947         if (!gspca_dev->sd_desc->get_chip_ident)
 948                 return -EINVAL;
 949
 950         if (!gspca_dev->sd_desc->set_register)
 951                 return -EINVAL;
 952
 953         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 954                 return -ERESTARTSYS;
 955         gspca_dev->usb_err = 0;
 956         if (gspca_dev->present)
 957                 ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
 958         else
 959                 ret = -ENODEV;
 960         mutex_unlock(&gspca_dev->usb_lock);
 961
 962         return ret;
 963 }
 964 #endif
 965
 966 static int vidioc_g_chip_ident(struct file *file, void *priv,
 967                         struct v4l2_dbg_chip_ident *chip)
 968 {
 969         int ret;
 970         struct gspca_dev *gspca_dev = priv;
 971
 972         if (!gspca_dev->sd_desc->get_chip_ident)
 973                 return -EINVAL;
 974
 975         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
 976                 return -ERESTARTSYS;
 977         gspca_dev->usb_err = 0;
 978         if (gspca_dev->present)
 979                 ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
 980         else
 981                 ret = -ENODEV;
 982         mutex_unlock(&gspca_dev->usb_lock);
 983
 984         return ret;
 985 }
 986
 987 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 988                                 struct v4l2_fmtdesc *fmtdesc)
 989 {
 990         struct gspca_dev *gspca_dev = priv;
 991         int i, j, index;
 992         __u32 fmt_tb[8];
 993
 994         /* give an index to each format */
 995         index = 0;
 996         j = 0;
 997         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 998                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
 999                 j = 0;
1000                 for (;;) {
1001                         if (fmt_tb[j] == fmt_tb[index])
1002                                 break;
1003                         j++;
1004                 }
1005                 if (j == index) {
1006                         if (fmtdesc->index == index)
1007                                 break;          /* new format */
1008                         index++;
1009                         if (index >= ARRAY_SIZE(fmt_tb))
1010                                 return -EINVAL;
1011                 }
1012         }
1013         if (i < 0)
1014                 return -EINVAL;         /* no more format */
1015
1016         fmtdesc->pixelformat = fmt_tb[index];
1017         if (gspca_is_compressed(fmt_tb[index]))
1018                 fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED;
1019         fmtdesc->description[0] = fmtdesc->pixelformat & 0xff;
1020         fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff;
1021         fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff;
1022         fmtdesc->description[3] = fmtdesc->pixelformat >> 24;
1023         fmtdesc->description[4] = '\0';
1024         return 0;
1025 }
1026
1027 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1028                             struct v4l2_format *fmt)
1029 {
1030         struct gspca_dev *gspca_dev = priv;
1031         int mode;
1032
1033         mode = gspca_dev->curr_mode;
1034         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1035                 sizeof fmt->fmt.pix);
1036         return 0;
1037 }
1038
1039 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1040                         struct v4l2_format *fmt)
1041 {
1042         int w, h, mode, mode2;
1043
1044         w = fmt->fmt.pix.width;
1045         h = fmt->fmt.pix.height;
1046
1047 #ifdef GSPCA_DEBUG
1048         if (gspca_debug & D_CONF)
1049                 PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h);
1050 #endif
1051         /* search the closest mode for width and height */
1052         mode = wxh_to_mode(gspca_dev, w, h);
1053
1054         /* OK if right palette */
1055         if (gspca_dev->cam.cam_mode[mode].pixelformat
1056                                                 != fmt->fmt.pix.pixelformat) {
1057
1058                 /* else, search the closest mode with the same pixel format */
1059                 mode2 = gspca_get_mode(gspca_dev, mode,
1060                                         fmt->fmt.pix.pixelformat);
1061                 if (mode2 >= 0)
1062                         mode = mode2;
1063 /*              else
1064                         ;                * no chance, return this mode */
1065         }
1066         memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
1067                 sizeof fmt->fmt.pix);
1068         return mode;                    /* used when s_fmt */
1069 }
1070
1071 static int vidioc_try_fmt_vid_cap(struct file *file,
1072                               void *priv,
1073                               struct v4l2_format *fmt)
1074 {
1075         struct gspca_dev *gspca_dev = priv;
1076         int ret;
1077
1078         ret = try_fmt_vid_cap(gspca_dev, fmt);
1079         if (ret < 0)
1080                 return ret;
1081         return 0;
1082 }
1083
1084 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1085                             struct v4l2_format *fmt)
1086 {
1087         struct gspca_dev *gspca_dev = priv;
1088         int ret;
1089
1090         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1091                 return -ERESTARTSYS;
1092
1093         ret = try_fmt_vid_cap(gspca_dev, fmt);
1094         if (ret < 0)
1095                 goto out;
1096
1097         if (gspca_dev->nframes != 0
1098             && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
1099                 ret = -EINVAL;
1100                 goto out;
1101         }
1102
1103         if (ret == gspca_dev->curr_mode) {
1104                 ret = 0;
1105                 goto out;                       /* same mode */
1106         }
1107
1108         if (gspca_dev->streaming) {
1109                 ret = -EBUSY;
1110                 goto out;
1111         }
1112         gspca_dev->width = fmt->fmt.pix.width;
1113         gspca_dev->height = fmt->fmt.pix.height;
1114         gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
1115         gspca_dev->curr_mode = ret;
1116
1117         ret = 0;
1118 out:
1119         mutex_unlock(&gspca_dev->queue_lock);
1120         return ret;
1121 }
1122
1123 static int vidioc_enum_framesizes(struct file *file, void *priv,
1124                                   struct v4l2_frmsizeenum *fsize)
1125 {
1126         struct gspca_dev *gspca_dev = priv;
1127         int i;
1128         __u32 index = 0;
1129
1130         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1131                 if (fsize->pixel_format !=
1132                                 gspca_dev->cam.cam_mode[i].pixelformat)
1133                         continue;
1134
1135                 if (fsize->index == index) {
1136                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1137                         fsize->discrete.width =
1138                                 gspca_dev->cam.cam_mode[i].width;
1139                         fsize->discrete.height =
1140                                 gspca_dev->cam.cam_mode[i].height;
1141                         return 0;
1142                 }
1143                 index++;
1144         }
1145
1146         return -EINVAL;
1147 }
1148
1149 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1150                                       struct v4l2_frmivalenum *fival)
1151 {
1152         struct gspca_dev *gspca_dev = priv;
1153         int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
1154         __u32 i;
1155
1156         if (gspca_dev->cam.mode_framerates == NULL ||
1157                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1158                 return -EINVAL;
1159
1160         if (fival->pixel_format !=
1161                         gspca_dev->cam.cam_mode[mode].pixelformat)
1162                 return -EINVAL;
1163
1164         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1165                 if (fival->index == i) {
1166                         fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1167                         fival->discrete.numerator = 1;
1168                         fival->discrete.denominator =
1169                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1170                         return 0;
1171                 }
1172         }
1173
1174         return -EINVAL;
1175 }
1176
1177 static void gspca_release(struct video_device *vfd)
1178 {
1179         struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1180
1181         PDEBUG(D_PROBE, "%s released",
1182                 video_device_node_name(&gspca_dev->vdev));
1183
1184         kfree(gspca_dev->usb_buf);
1185         kfree(gspca_dev);
1186 }
1187
1188 static int dev_open(struct file *file)
1189 {
1190         struct gspca_dev *gspca_dev;
1191         int ret;
1192
1193         PDEBUG(D_STREAM, "[%s] open", current->comm);
1194         gspca_dev = (struct gspca_dev *) video_devdata(file);
1195         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1196                 return -ERESTARTSYS;
1197         if (!gspca_dev->present) {
1198                 ret = -ENODEV;
1199                 goto out;
1200         }
1201
1202         if (gspca_dev->users > 4) {     /* (arbitrary value) */
1203                 ret = -EBUSY;
1204                 goto out;
1205         }
1206
1207         /* protect the subdriver against rmmod */
1208         if (!try_module_get(gspca_dev->module)) {
1209                 ret = -ENODEV;
1210                 goto out;
1211         }
1212
1213         gspca_dev->users++;
1214
1215         file->private_data = gspca_dev;
1216 #ifdef GSPCA_DEBUG
1217         /* activate the v4l2 debug */
1218         if (gspca_debug & D_V4L2)
1219                 gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1220                                         | V4L2_DEBUG_IOCTL_ARG;
1221         else
1222                 gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1223                                         | V4L2_DEBUG_IOCTL_ARG);
1224 #endif
1225         ret = 0;
1226 out:
1227         mutex_unlock(&gspca_dev->queue_lock);
1228         if (ret != 0)
1229                 PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
1230         else
1231                 PDEBUG(D_STREAM, "open done");
1232         return ret;
1233 }
1234
1235 static int dev_close(struct file *file)
1236 {
1237         struct gspca_dev *gspca_dev = file->private_data;
1238
1239         PDEBUG(D_STREAM, "[%s] close", current->comm);
1240         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1241                 return -ERESTARTSYS;
1242         gspca_dev->users--;
1243
1244         /* if the file did the capture, free the streaming resources */
1245         if (gspca_dev->capt_file == file) {
1246                 if (gspca_dev->streaming) {
1247                         mutex_lock(&gspca_dev->usb_lock);
1248                         gspca_dev->usb_err = 0;
1249                         gspca_stream_off(gspca_dev);
1250                         mutex_unlock(&gspca_dev->usb_lock);
1251                 }
1252                 frame_free(gspca_dev);
1253                 gspca_dev->capt_file = NULL;
1254                 gspca_dev->memory = GSPCA_MEMORY_NO;
1255         }
1256         file->private_data = NULL;
1257         module_put(gspca_dev->module);
1258         mutex_unlock(&gspca_dev->queue_lock);
1259
1260         PDEBUG(D_STREAM, "close done");
1261
1262         return 0;
1263 }
1264
1265 static int vidioc_querycap(struct file *file, void  *priv,
1266                            struct v4l2_capability *cap)
1267 {
1268         struct gspca_dev *gspca_dev = priv;
1269         int ret;
1270
1271         /* protect the access to the usb device */
1272         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1273                 return -ERESTARTSYS;
1274         if (!gspca_dev->present) {
1275                 ret = -ENODEV;
1276                 goto out;
1277         }
1278         strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
1279         if (gspca_dev->dev->product != NULL) {
1280                 strncpy(cap->card, gspca_dev->dev->product,
1281                         sizeof cap->card);
1282         } else {
1283                 snprintf(cap->card, sizeof cap->card,
1284                         "USB Camera (%04x:%04x)",
1285                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1286                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1287         }
1288         usb_make_path(gspca_dev->dev, cap->bus_info, sizeof(cap->bus_info));
1289         cap->version = DRIVER_VERSION_NUMBER;
1290         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
1291                           | V4L2_CAP_STREAMING
1292                           | V4L2_CAP_READWRITE;
1293         ret = 0;
1294 out:
1295         mutex_unlock(&gspca_dev->usb_lock);
1296         return ret;
1297 }
1298
1299 static const struct ctrl *get_ctrl(struct gspca_dev *gspca_dev,
1300                                    int id)
1301 {
1302         const struct ctrl *ctrls;
1303         int i;
1304
1305         for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
1306              i < gspca_dev->sd_desc->nctrls;
1307              i++, ctrls++) {
1308                 if (gspca_dev->ctrl_dis & (1 << i))
1309                         continue;
1310                 if (id == ctrls->qctrl.id)
1311                         return ctrls;
1312         }
1313         return NULL;
1314 }
1315
1316 static int vidioc_queryctrl(struct file *file, void *priv,
1317                            struct v4l2_queryctrl *q_ctrl)
1318 {
1319         struct gspca_dev *gspca_dev = priv;
1320         const struct ctrl *ctrls;
1321         int i;
1322         u32 id;
1323
1324         ctrls = NULL;
1325         id = q_ctrl->id;
1326         if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
1327                 id &= V4L2_CTRL_ID_MASK;
1328                 id++;
1329                 for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1330                         if (gspca_dev->ctrl_dis & (1 << i))
1331                                 continue;
1332                         if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1333                                 continue;
1334                         if (ctrls && gspca_dev->sd_desc->ctrls[i].qctrl.id
1335                                             > ctrls->qctrl.id)
1336                                 continue;
1337                         ctrls = &gspca_dev->sd_desc->ctrls[i];
1338                 }
1339                 if (ctrls == NULL)
1340                         return -EINVAL;
1341         } else {
1342                 ctrls = get_ctrl(gspca_dev, id);
1343                 if (ctrls == NULL)
1344                         return -EINVAL;
1345                 i = ctrls - gspca_dev->sd_desc->ctrls;
1346         }
1347         memcpy(q_ctrl, ctrls, sizeof *q_ctrl);
1348         if (gspca_dev->ctrl_inac & (1 << i))
1349                 q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1350         return 0;
1351 }
1352
1353 static int vidioc_s_ctrl(struct file *file, void *priv,
1354                          struct v4l2_control *ctrl)
1355 {
1356         struct gspca_dev *gspca_dev = priv;
1357         const struct ctrl *ctrls;
1358         int ret;
1359
1360         ctrls = get_ctrl(gspca_dev, ctrl->id);
1361         if (ctrls == NULL)
1362                 return -EINVAL;
1363
1364         if (ctrl->value < ctrls->qctrl.minimum
1365             || ctrl->value > ctrls->qctrl.maximum)
1366                 return -ERANGE;
1367         PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
1368         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1369                 return -ERESTARTSYS;
1370         gspca_dev->usb_err = 0;
1371         if (gspca_dev->present)
1372                 ret = ctrls->set(gspca_dev, ctrl->value);
1373         else
1374                 ret = -ENODEV;
1375         mutex_unlock(&gspca_dev->usb_lock);
1376         return ret;
1377 }
1378
1379 static int vidioc_g_ctrl(struct file *file, void *priv,
1380                          struct v4l2_control *ctrl)
1381 {
1382         struct gspca_dev *gspca_dev = priv;
1383         const struct ctrl *ctrls;
1384         int ret;
1385
1386         ctrls = get_ctrl(gspca_dev, ctrl->id);
1387         if (ctrls == NULL)
1388                 return -EINVAL;
1389
1390         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1391                 return -ERESTARTSYS;
1392         gspca_dev->usb_err = 0;
1393         if (gspca_dev->present)
1394                 ret = ctrls->get(gspca_dev, &ctrl->value);
1395         else
1396                 ret = -ENODEV;
1397         mutex_unlock(&gspca_dev->usb_lock);
1398         return ret;
1399 }
1400
1401 /*fixme: have an audio flag in gspca_dev?*/
1402 static int vidioc_s_audio(struct file *file, void *priv,
1403                          struct v4l2_audio *audio)
1404 {
1405         if (audio->index != 0)
1406                 return -EINVAL;
1407         return 0;
1408 }
1409
1410 static int vidioc_g_audio(struct file *file, void *priv,
1411                          struct v4l2_audio *audio)
1412 {
1413         strcpy(audio->name, "Microphone");
1414         return 0;
1415 }
1416
1417 static int vidioc_enumaudio(struct file *file, void *priv,
1418                          struct v4l2_audio *audio)
1419 {
1420         if (audio->index != 0)
1421                 return -EINVAL;
1422
1423         strcpy(audio->name, "Microphone");
1424         audio->capability = 0;
1425         audio->mode = 0;
1426         return 0;
1427 }
1428
1429 static int vidioc_querymenu(struct file *file, void *priv,
1430                             struct v4l2_querymenu *qmenu)
1431 {
1432         struct gspca_dev *gspca_dev = priv;
1433
1434         if (!gspca_dev->sd_desc->querymenu)
1435                 return -EINVAL;
1436         return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu);
1437 }
1438
1439 static int vidioc_enum_input(struct file *file, void *priv,
1440                                 struct v4l2_input *input)
1441 {
1442         struct gspca_dev *gspca_dev = priv;
1443
1444         if (input->index != 0)
1445                 return -EINVAL;
1446         input->type = V4L2_INPUT_TYPE_CAMERA;
1447         input->status = gspca_dev->cam.input_flags;
1448         strncpy(input->name, gspca_dev->sd_desc->name,
1449                 sizeof input->name);
1450         return 0;
1451 }
1452
1453 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1454 {
1455         *i = 0;
1456         return 0;
1457 }
1458
1459 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1460 {
1461         if (i > 0)
1462                 return -EINVAL;
1463         return (0);
1464 }
1465
1466 static int vidioc_reqbufs(struct file *file, void *priv,
1467                           struct v4l2_requestbuffers *rb)
1468 {
1469         struct gspca_dev *gspca_dev = priv;
1470         int i, ret = 0, streaming;
1471
1472         switch (rb->memory) {
1473         case GSPCA_MEMORY_READ:                 /* (internal call) */
1474         case V4L2_MEMORY_MMAP:
1475         case V4L2_MEMORY_USERPTR:
1476                 break;
1477         default:
1478                 return -EINVAL;
1479         }
1480         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1481                 return -ERESTARTSYS;
1482
1483         if (gspca_dev->memory != GSPCA_MEMORY_NO
1484             && gspca_dev->memory != rb->memory) {
1485                 ret = -EBUSY;
1486                 goto out;
1487         }
1488
1489         /* only one file may do the capture */
1490         if (gspca_dev->capt_file != NULL
1491             && gspca_dev->capt_file != file) {
1492                 ret = -EBUSY;
1493                 goto out;
1494         }
1495
1496         /* if allocated, the buffers must not be mapped */
1497         for (i = 0; i < gspca_dev->nframes; i++) {
1498                 if (gspca_dev->frame[i].vma_use_count) {
1499                         ret = -EBUSY;
1500                         goto out;
1501                 }
1502         }
1503
1504         /* stop streaming */
1505         streaming = gspca_dev->streaming;
1506         if (streaming) {
1507                 mutex_lock(&gspca_dev->usb_lock);
1508                 gspca_dev->usb_err = 0;
1509                 gspca_stream_off(gspca_dev);
1510                 mutex_unlock(&gspca_dev->usb_lock);
1511         }
1512
1513         /* free the previous allocated buffers, if any */
1514         if (gspca_dev->nframes != 0) {
1515                 frame_free(gspca_dev);
1516                 gspca_dev->capt_file = NULL;
1517         }
1518         if (rb->count == 0)                     /* unrequest */
1519                 goto out;
1520         gspca_dev->memory = rb->memory;
1521         ret = frame_alloc(gspca_dev, rb->count);
1522         if (ret == 0) {
1523                 rb->count = gspca_dev->nframes;
1524                 gspca_dev->capt_file = file;
1525                 if (streaming)
1526                         ret = gspca_init_transfer(gspca_dev);
1527         }
1528 out:
1529         mutex_unlock(&gspca_dev->queue_lock);
1530         PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count);
1531         return ret;
1532 }
1533
1534 static int vidioc_querybuf(struct file *file, void *priv,
1535                            struct v4l2_buffer *v4l2_buf)
1536 {
1537         struct gspca_dev *gspca_dev = priv;
1538         struct gspca_frame *frame;
1539
1540         if (v4l2_buf->index < 0
1541             || v4l2_buf->index >= gspca_dev->nframes)
1542                 return -EINVAL;
1543
1544         frame = &gspca_dev->frame[v4l2_buf->index];
1545         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1546         return 0;
1547 }
1548
1549 static int vidioc_streamon(struct file *file, void *priv,
1550                            enum v4l2_buf_type buf_type)
1551 {
1552         struct gspca_dev *gspca_dev = priv;
1553         int ret;
1554
1555         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1556                 return -EINVAL;
1557         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1558                 return -ERESTARTSYS;
1559
1560         /* check the capture file */
1561         if (gspca_dev->capt_file != file) {
1562                 ret = -EBUSY;
1563                 goto out;
1564         }
1565
1566         if (gspca_dev->nframes == 0
1567             || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1568                 ret = -EINVAL;
1569                 goto out;
1570         }
1571         if (!gspca_dev->streaming) {
1572                 ret = gspca_init_transfer(gspca_dev);
1573                 if (ret < 0)
1574                         goto out;
1575         }
1576 #ifdef GSPCA_DEBUG
1577         if (gspca_debug & D_STREAM) {
1578                 PDEBUG_MODE("stream on OK",
1579                         gspca_dev->pixfmt,
1580                         gspca_dev->width,
1581                         gspca_dev->height);
1582         }
1583 #endif
1584         ret = 0;
1585 out:
1586         mutex_unlock(&gspca_dev->queue_lock);
1587         return ret;
1588 }
1589
1590 static int vidioc_streamoff(struct file *file, void *priv,
1591                                 enum v4l2_buf_type buf_type)
1592 {
1593         struct gspca_dev *gspca_dev = priv;
1594         int i, ret;
1595
1596         if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1597                 return -EINVAL;
1598         if (!gspca_dev->streaming)
1599                 return 0;
1600         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1601                 return -ERESTARTSYS;
1602
1603         /* check the capture file */
1604         if (gspca_dev->capt_file != file) {
1605                 ret = -EBUSY;
1606                 goto out;
1607         }
1608
1609         /* stop streaming */
1610         if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
1611                 ret = -ERESTARTSYS;
1612                 goto out;
1613         }
1614         gspca_dev->usb_err = 0;
1615         gspca_stream_off(gspca_dev);
1616         mutex_unlock(&gspca_dev->usb_lock);
1617
1618         /* empty the application queues */
1619         for (i = 0; i < gspca_dev->nframes; i++)
1620                 gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
1621         gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
1622         gspca_dev->last_packet_type = DISCARD_PACKET;
1623         gspca_dev->sequence = 0;
1624         ret = 0;
1625 out:
1626         mutex_unlock(&gspca_dev->queue_lock);
1627         return ret;
1628 }
1629
1630 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1631                         struct v4l2_jpegcompression *jpegcomp)
1632 {
1633         struct gspca_dev *gspca_dev = priv;
1634         int ret;
1635
1636         if (!gspca_dev->sd_desc->get_jcomp)
1637                 return -EINVAL;
1638         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1639                 return -ERESTARTSYS;
1640         gspca_dev->usb_err = 0;
1641         if (gspca_dev->present)
1642                 ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1643         else
1644                 ret = -ENODEV;
1645         mutex_unlock(&gspca_dev->usb_lock);
1646         return ret;
1647 }
1648
1649 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1650                         struct v4l2_jpegcompression *jpegcomp)
1651 {
1652         struct gspca_dev *gspca_dev = priv;
1653         int ret;
1654
1655         if (!gspca_dev->sd_desc->set_jcomp)
1656                 return -EINVAL;
1657         if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1658                 return -ERESTARTSYS;
1659         gspca_dev->usb_err = 0;
1660         if (gspca_dev->present)
1661                 ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1662         else
1663                 ret = -ENODEV;
1664         mutex_unlock(&gspca_dev->usb_lock);
1665         return ret;
1666 }
1667
1668 static int vidioc_g_parm(struct file *filp, void *priv,
1669                         struct v4l2_streamparm *parm)
1670 {
1671         struct gspca_dev *gspca_dev = priv;
1672
1673         parm->parm.capture.readbuffers = gspca_dev->nbufread;
1674
1675         if (gspca_dev->sd_desc->get_streamparm) {
1676                 int ret;
1677
1678                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1679                         return -ERESTARTSYS;
1680                 gspca_dev->usb_err = 0;
1681                 if (gspca_dev->present)
1682                         ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
1683                                                                  parm);
1684                 else
1685                         ret = -ENODEV;
1686                 mutex_unlock(&gspca_dev->usb_lock);
1687                 return ret;
1688         }
1689
1690         return 0;
1691 }
1692
1693 static int vidioc_s_parm(struct file *filp, void *priv,
1694                         struct v4l2_streamparm *parm)
1695 {
1696         struct gspca_dev *gspca_dev = priv;
1697         int n;
1698
1699         n = parm->parm.capture.readbuffers;
1700         if (n == 0 || n > GSPCA_MAX_FRAMES)
1701                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
1702         else
1703                 gspca_dev->nbufread = n;
1704
1705         if (gspca_dev->sd_desc->set_streamparm) {
1706                 int ret;
1707
1708                 if (mutex_lock_interruptible(&gspca_dev->usb_lock))
1709                         return -ERESTARTSYS;
1710                 gspca_dev->usb_err = 0;
1711                 if (gspca_dev->present)
1712                         ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
1713                                                                  parm);
1714                 else
1715                         ret = -ENODEV;
1716                 mutex_unlock(&gspca_dev->usb_lock);
1717                 return ret;
1718         }
1719
1720         return 0;
1721 }
1722
1723 static int dev_mmap(struct file *file, struct vm_area_struct *vma)
1724 {
1725         struct gspca_dev *gspca_dev = file->private_data;
1726         struct gspca_frame *frame;
1727         struct page *page;
1728         unsigned long addr, start, size;
1729         int i, ret;
1730
1731         start = vma->vm_start;
1732         size = vma->vm_end - vma->vm_start;
1733         PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
1734
1735         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1736                 return -ERESTARTSYS;
1737         if (!gspca_dev->present) {
1738                 ret = -ENODEV;
1739                 goto out;
1740         }
1741         if (gspca_dev->capt_file != file) {
1742                 ret = -EINVAL;
1743                 goto out;
1744         }
1745
1746         frame = NULL;
1747         for (i = 0; i < gspca_dev->nframes; ++i) {
1748                 if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) {
1749                         PDEBUG(D_STREAM, "mmap bad memory type");
1750                         break;
1751                 }
1752                 if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT)
1753                                                 == vma->vm_pgoff) {
1754                         frame = &gspca_dev->frame[i];
1755                         break;
1756                 }
1757         }
1758         if (frame == NULL) {
1759                 PDEBUG(D_STREAM, "mmap no frame buffer found");
1760                 ret = -EINVAL;
1761                 goto out;
1762         }
1763         if (size != frame->v4l2_buf.length) {
1764                 PDEBUG(D_STREAM, "mmap bad size");
1765                 ret = -EINVAL;
1766                 goto out;
1767         }
1768
1769         /*
1770          * - VM_IO marks the area as being a mmaped region for I/O to a
1771          *   device. It also prevents the region from being core dumped.
1772          */
1773         vma->vm_flags |= VM_IO;
1774
1775         addr = (unsigned long) frame->data;
1776         while (size > 0) {
1777                 page = vmalloc_to_page((void *) addr);
1778                 ret = vm_insert_page(vma, start, page);
1779                 if (ret < 0)
1780                         goto out;
1781                 start += PAGE_SIZE;
1782                 addr += PAGE_SIZE;
1783                 size -= PAGE_SIZE;
1784         }
1785
1786         vma->vm_ops = &gspca_vm_ops;
1787         vma->vm_private_data = frame;
1788         gspca_vm_open(vma);
1789         ret = 0;
1790 out:
1791         mutex_unlock(&gspca_dev->queue_lock);
1792         return ret;
1793 }
1794
1795 /*
1796  * wait for a video frame
1797  *
1798  * If a frame is ready, its index is returned.
1799  */
1800 static int frame_wait(struct gspca_dev *gspca_dev,
1801                         int nonblock_ing)
1802 {
1803         struct gspca_frame *frame;
1804         int i, j, ret;
1805
1806         /* check if a frame is ready */
1807         i = gspca_dev->fr_o;
1808         j = gspca_dev->fr_queue[i];
1809         frame = &gspca_dev->frame[j];
1810
1811         if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
1812                 if (nonblock_ing)
1813                         return -EAGAIN;
1814
1815                 /* wait till a frame is ready */
1816                 ret = wait_event_interruptible_timeout(gspca_dev->wq,
1817                         (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
1818                         !gspca_dev->streaming || !gspca_dev->present,
1819                         msecs_to_jiffies(3000));
1820                 if (ret < 0)
1821                         return ret;
1822                 if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1823                         return -EIO;
1824         }
1825
1826         gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
1827         PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
1828                 gspca_dev->fr_q,
1829                 gspca_dev->fr_i,
1830                 gspca_dev->fr_o);
1831
1832         if (gspca_dev->sd_desc->dq_callback) {
1833                 mutex_lock(&gspca_dev->usb_lock);
1834                 gspca_dev->usb_err = 0;
1835                 if (gspca_dev->present)
1836                         gspca_dev->sd_desc->dq_callback(gspca_dev);
1837                 mutex_unlock(&gspca_dev->usb_lock);
1838         }
1839         return j;
1840 }
1841
1842 /*
1843  * dequeue a video buffer
1844  *
1845  * If nonblock_ing is false, block until a buffer is available.
1846  */
1847 static int vidioc_dqbuf(struct file *file, void *priv,
1848                         struct v4l2_buffer *v4l2_buf)
1849 {
1850         struct gspca_dev *gspca_dev = priv;
1851         struct gspca_frame *frame;
1852         int i, ret;
1853
1854         PDEBUG(D_FRAM, "dqbuf");
1855         if (v4l2_buf->memory != gspca_dev->memory)
1856                 return -EINVAL;
1857
1858         if (!gspca_dev->present)
1859                 return -ENODEV;
1860
1861         /* if not streaming, be sure the application will not loop forever */
1862         if (!(file->f_flags & O_NONBLOCK)
1863             && !gspca_dev->streaming && gspca_dev->users == 1)
1864                 return -EINVAL;
1865
1866         /* only the capturing file may dequeue */
1867         if (gspca_dev->capt_file != file)
1868                 return -EINVAL;
1869
1870         /* only one dequeue / read at a time */
1871         if (mutex_lock_interruptible(&gspca_dev->read_lock))
1872                 return -ERESTARTSYS;
1873
1874         ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1875         if (ret < 0)
1876                 goto out;
1877         i = ret;                                /* frame index */
1878         frame = &gspca_dev->frame[i];
1879         if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1880                 if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1881                                  frame->data,
1882                                  frame->v4l2_buf.bytesused)) {
1883                         PDEBUG(D_ERR|D_STREAM,
1884                                 "dqbuf cp to user failed");
1885                         ret = -EFAULT;
1886                         goto out;
1887                 }
1888         }
1889         frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
1890         memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
1891         PDEBUG(D_FRAM, "dqbuf %d", i);
1892         ret = 0;
1893 out:
1894         mutex_unlock(&gspca_dev->read_lock);
1895         return ret;
1896 }
1897
1898 /*
1899  * queue a video buffer
1900  *
1901  * Attempting to queue a buffer that has already been
1902  * queued will return -EINVAL.
1903  */
1904 static int vidioc_qbuf(struct file *file, void *priv,
1905                         struct v4l2_buffer *v4l2_buf)
1906 {
1907         struct gspca_dev *gspca_dev = priv;
1908         struct gspca_frame *frame;
1909         int i, index, ret;
1910
1911         PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index);
1912
1913         if (mutex_lock_interruptible(&gspca_dev->queue_lock))
1914                 return -ERESTARTSYS;
1915
1916         index = v4l2_buf->index;
1917         if ((unsigned) index >= gspca_dev->nframes) {
1918                 PDEBUG(D_FRAM,
1919                         "qbuf idx %d >= %d", index, gspca_dev->nframes);
1920                 ret = -EINVAL;
1921                 goto out;
1922         }
1923         if (v4l2_buf->memory != gspca_dev->memory) {
1924                 PDEBUG(D_FRAM, "qbuf bad memory type");
1925                 ret = -EINVAL;
1926                 goto out;
1927         }
1928
1929         frame = &gspca_dev->frame[index];
1930         if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
1931                 PDEBUG(D_FRAM, "qbuf bad state");
1932                 ret = -EINVAL;
1933                 goto out;
1934         }
1935
1936         frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;
1937
1938         if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1939                 frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
1940                 frame->v4l2_buf.length = v4l2_buf->length;
1941         }
1942
1943         /* put the buffer in the 'queued' queue */
1944         i = gspca_dev->fr_q;
1945         gspca_dev->fr_queue[i] = index;
1946         if (gspca_dev->fr_i == i)
1947                 gspca_dev->image = frame->data;
1948         gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
1949         PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
1950                 gspca_dev->fr_q,
1951                 gspca_dev->fr_i,
1952                 gspca_dev->fr_o);
1953
1954         v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
1955         v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
1956         ret = 0;
1957 out:
1958         mutex_unlock(&gspca_dev->queue_lock);
1959         return ret;
1960 }
1961
1962 /*
1963  * allocate the resources for read()
1964  */
1965 static int read_alloc(struct gspca_dev *gspca_dev,
1966                         struct file *file)
1967 {
1968         struct v4l2_buffer v4l2_buf;
1969         int i, ret;
1970
1971         PDEBUG(D_STREAM, "read alloc");
1972         if (gspca_dev->nframes == 0) {
1973                 struct v4l2_requestbuffers rb;
1974
1975                 memset(&rb, 0, sizeof rb);
1976                 rb.count = gspca_dev->nbufread;
1977                 rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1978                 rb.memory = GSPCA_MEMORY_READ;
1979                 ret = vidioc_reqbufs(file, gspca_dev, &rb);
1980                 if (ret != 0) {
1981                         PDEBUG(D_STREAM, "read reqbuf err %d", ret);
1982                         return ret;
1983                 }
1984                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
1985                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1986                 v4l2_buf.memory = GSPCA_MEMORY_READ;
1987                 for (i = 0; i < gspca_dev->nbufread; i++) {
1988                         v4l2_buf.index = i;
1989                         ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
1990                         if (ret != 0) {
1991                                 PDEBUG(D_STREAM, "read qbuf err: %d", ret);
1992                                 return ret;
1993                         }
1994                 }
1995                 gspca_dev->memory = GSPCA_MEMORY_READ;
1996         }
1997
1998         /* start streaming */
1999         ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE);
2000         if (ret != 0)
2001                 PDEBUG(D_STREAM, "read streamon err %d", ret);
2002         return ret;
2003 }
2004
2005 static unsigned int dev_poll(struct file *file, poll_table *wait)
2006 {
2007         struct gspca_dev *gspca_dev = file->private_data;
2008         int i, ret;
2009
2010         PDEBUG(D_FRAM, "poll");
2011
2012         poll_wait(file, &gspca_dev->wq, wait);
2013
2014         /* if reqbufs is not done, the user would use read() */
2015         if (gspca_dev->nframes == 0) {
2016                 if (gspca_dev->memory != GSPCA_MEMORY_NO)
2017                         return POLLERR;         /* not the 1st time */
2018                 ret = read_alloc(gspca_dev, file);
2019                 if (ret != 0)
2020                         return POLLERR;
2021         }
2022
2023         if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
2024                 return POLLERR;
2025
2026         /* check the next incoming buffer */
2027         i = gspca_dev->fr_o;
2028         i = gspca_dev->fr_queue[i];
2029         if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
2030                 ret = POLLIN | POLLRDNORM;      /* something to read */
2031         else
2032                 ret = 0;
2033         mutex_unlock(&gspca_dev->queue_lock);
2034         if (!gspca_dev->present)
2035                 return POLLHUP;
2036         return ret;
2037 }
2038
2039 static ssize_t dev_read(struct file *file, char __user *data,
2040                     size_t count, loff_t *ppos)
2041 {
2042         struct gspca_dev *gspca_dev = file->private_data;
2043         struct gspca_frame *frame;
2044         struct v4l2_buffer v4l2_buf;
2045         struct timeval timestamp;
2046         int n, ret, ret2;
2047
2048         PDEBUG(D_FRAM, "read (%zd)", count);
2049         if (!gspca_dev->present)
2050                 return -ENODEV;
2051         switch (gspca_dev->memory) {
2052         case GSPCA_MEMORY_NO:                   /* first time */
2053                 ret = read_alloc(gspca_dev, file);
2054                 if (ret != 0)
2055                         return ret;
2056                 break;
2057         case GSPCA_MEMORY_READ:
2058                 if (gspca_dev->capt_file == file)
2059                         break;
2060                 /* fall thru */
2061         default:
2062                 return -EINVAL;
2063         }
2064
2065         /* get a frame */
2066         timestamp = ktime_to_timeval(ktime_get());
2067         timestamp.tv_sec--;
2068         n = 2;
2069         for (;;) {
2070                 memset(&v4l2_buf, 0, sizeof v4l2_buf);
2071                 v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2072                 v4l2_buf.memory = GSPCA_MEMORY_READ;
2073                 ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
2074                 if (ret != 0) {
2075                         PDEBUG(D_STREAM, "read dqbuf err %d", ret);
2076                         return ret;
2077                 }
2078
2079                 /* if the process slept for more than 1 second,
2080                  * get a newer frame */
2081                 frame = &gspca_dev->frame[v4l2_buf.index];
2082                 if (--n < 0)
2083                         break;                  /* avoid infinite loop */
2084                 if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec)
2085                         break;
2086                 ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2087                 if (ret != 0) {
2088                         PDEBUG(D_STREAM, "read qbuf err %d", ret);
2089                         return ret;
2090                 }
2091         }
2092
2093         /* copy the frame */
2094         if (count > frame->v4l2_buf.bytesused)
2095                 count = frame->v4l2_buf.bytesused;
2096         ret = copy_to_user(data, frame->data, count);
2097         if (ret != 0) {
2098                 PDEBUG(D_ERR|D_STREAM,
2099                         "read cp to user lack %d / %zd", ret, count);
2100                 ret = -EFAULT;
2101                 goto out;
2102         }
2103         ret = count;
2104 out:
2105         /* in each case, requeue the buffer */
2106         ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf);
2107         if (ret2 != 0)
2108                 return ret2;
2109         return ret;
2110 }
2111
2112 static struct v4l2_file_operations dev_fops = {
2113         .owner = THIS_MODULE,
2114         .open = dev_open,
2115         .release = dev_close,
2116         .read = dev_read,
2117         .mmap = dev_mmap,
2118         .unlocked_ioctl = video_ioctl2,
2119         .poll   = dev_poll,
2120 };
2121
2122 static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2123         .vidioc_querycap        = vidioc_querycap,
2124         .vidioc_dqbuf           = vidioc_dqbuf,
2125         .vidioc_qbuf            = vidioc_qbuf,
2126         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
2127         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
2128         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
2129         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
2130         .vidioc_streamon        = vidioc_streamon,
2131         .vidioc_queryctrl       = vidioc_queryctrl,
2132         .vidioc_g_ctrl          = vidioc_g_ctrl,
2133         .vidioc_s_ctrl          = vidioc_s_ctrl,
2134         .vidioc_g_audio         = vidioc_g_audio,
2135         .vidioc_s_audio         = vidioc_s_audio,
2136         .vidioc_enumaudio       = vidioc_enumaudio,
2137         .vidioc_querymenu       = vidioc_querymenu,
2138         .vidioc_enum_input      = vidioc_enum_input,
2139         .vidioc_g_input         = vidioc_g_input,
2140         .vidioc_s_input         = vidioc_s_input,
2141         .vidioc_reqbufs         = vidioc_reqbufs,
2142         .vidioc_querybuf        = vidioc_querybuf,
2143         .vidioc_streamoff       = vidioc_streamoff,
2144         .vidioc_g_jpegcomp      = vidioc_g_jpegcomp,
2145         .vidioc_s_jpegcomp      = vidioc_s_jpegcomp,
2146         .vidioc_g_parm          = vidioc_g_parm,
2147         .vidioc_s_parm          = vidioc_s_parm,
2148         .vidioc_enum_framesizes = vidioc_enum_framesizes,
2149         .vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2150 #ifdef CONFIG_VIDEO_ADV_DEBUG
2151         .vidioc_g_register      = vidioc_g_register,
2152         .vidioc_s_register      = vidioc_s_register,
2153 #endif
2154         .vidioc_g_chip_ident    = vidioc_g_chip_ident,
2155 };
2156
2157 static struct video_device gspca_template = {
2158         .name = "gspca main driver",
2159         .fops = &dev_fops,
2160         .ioctl_ops = &dev_ioctl_ops,
2161         .release = gspca_release,
2162 };
2163
2164 /*
2165  * probe and create a new gspca device
2166  *
2167  * This function must be called by the sub-driver when it is
2168  * called for probing a new device.
2169  */
2170 int gspca_dev_probe2(struct usb_interface *intf,
2171                 const struct usb_device_id *id,
2172                 const struct sd_desc *sd_desc,
2173                 int dev_size,
2174                 struct module *module)
2175 {
2176         struct gspca_dev *gspca_dev;
2177         struct usb_device *dev = interface_to_usbdev(intf);
2178         int ret;
2179
2180         PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2181
2182         /* create the device */
2183         if (dev_size < sizeof *gspca_dev)
2184                 dev_size = sizeof *gspca_dev;
2185         gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2186         if (!gspca_dev) {
2187                 err("couldn't kzalloc gspca struct");
2188                 return -ENOMEM;
2189         }
2190         gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
2191         if (!gspca_dev->usb_buf) {
2192                 err("out of memory");
2193                 ret = -ENOMEM;
2194                 goto out;
2195         }
2196         gspca_dev->dev = dev;
2197         gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2198         gspca_dev->nbalt = intf->num_altsetting;
2199         gspca_dev->sd_desc = sd_desc;
2200         gspca_dev->nbufread = 2;
2201         gspca_dev->empty_packet = -1;   /* don't check the empty packets */
2202
2203         /* configure the subdriver and initialize the USB device */
2204         ret = sd_desc->config(gspca_dev, id);
2205         if (ret < 0)
2206                 goto out;
2207         ret = sd_desc->init(gspca_dev);
2208         if (ret < 0)
2209                 goto out;
2210         gspca_set_default_mode(gspca_dev);
2211
2212         ret = gspca_input_connect(gspca_dev);
2213         if (ret)
2214                 goto out;
2215
2216         mutex_init(&gspca_dev->usb_lock);
2217         mutex_init(&gspca_dev->read_lock);
2218         mutex_init(&gspca_dev->queue_lock);
2219         init_waitqueue_head(&gspca_dev->wq);
2220
2221         /* init video stuff */
2222         memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2223         gspca_dev->vdev.parent = &intf->dev;
2224         gspca_dev->module = module;
2225         gspca_dev->present = 1;
2226         ret = video_register_device(&gspca_dev->vdev,
2227                                   VFL_TYPE_GRABBER,
2228                                   -1);
2229         if (ret < 0) {
2230                 err("video_register_device err %d", ret);
2231                 goto out;
2232         }
2233
2234         usb_set_intfdata(intf, gspca_dev);
2235         PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2236
2237         gspca_input_create_urb(gspca_dev);
2238
2239         return 0;
2240 out:
2241 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2242         if (gspca_dev->input_dev)
2243                 input_unregister_device(gspca_dev->input_dev);
2244 #endif
2245         kfree(gspca_dev->usb_buf);
2246         kfree(gspca_dev);
2247         return ret;
2248 }
2249 EXPORT_SYMBOL(gspca_dev_probe2);
2250
2251 /* same function as the previous one, but check the interface */
2252 int gspca_dev_probe(struct usb_interface *intf,
2253                 const struct usb_device_id *id,
2254                 const struct sd_desc *sd_desc,
2255                 int dev_size,
2256                 struct module *module)
2257 {
2258         struct usb_device *dev = interface_to_usbdev(intf);
2259
2260         /* we don't handle multi-config cameras */
2261         if (dev->descriptor.bNumConfigurations != 1) {
2262                 PDEBUG(D_ERR, "%04x:%04x too many config",
2263                                 id->idVendor, id->idProduct);
2264                 return -ENODEV;
2265         }
2266
2267         /* the USB video interface must be the first one */
2268         if (dev->config->desc.bNumInterfaces != 1
2269          && intf->cur_altsetting->desc.bInterfaceNumber != 0) {
2270                 PDEBUG(D_ERR, "%04x:%04x bad interface %d",
2271                                 id->idVendor, id->idProduct,
2272                                 intf->cur_altsetting->desc.bInterfaceNumber);
2273                 return -ENODEV;
2274         }
2275
2276         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
2277 }
2278 EXPORT_SYMBOL(gspca_dev_probe);
2279
2280 /*
2281  * USB disconnection
2282  *
2283  * This function must be called by the sub-driver
2284  * when the device disconnects, after the specific resources are freed.
2285  */
2286 void gspca_disconnect(struct usb_interface *intf)
2287 {
2288         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2289 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2290         struct input_dev *input_dev;
2291 #endif
2292
2293         PDEBUG(D_PROBE, "%s disconnect",
2294                 video_device_node_name(&gspca_dev->vdev));
2295         mutex_lock(&gspca_dev->usb_lock);
2296         gspca_dev->present = 0;
2297
2298         if (gspca_dev->streaming) {
2299                 destroy_urbs(gspca_dev);
2300                 wake_up_interruptible(&gspca_dev->wq);
2301         }
2302
2303 #if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2304         gspca_input_destroy_urb(gspca_dev);
2305         input_dev = gspca_dev->input_dev;
2306         if (input_dev) {
2307                 gspca_dev->input_dev = NULL;
2308                 input_unregister_device(input_dev);
2309         }
2310 #endif
2311
2312         /* the device is freed at exit of this function */
2313         gspca_dev->dev = NULL;
2314         mutex_unlock(&gspca_dev->usb_lock);
2315
2316         usb_set_intfdata(intf, NULL);
2317
2318         /* release the device */
2319         /* (this will call gspca_release() immediatly or on last close) */
2320         video_unregister_device(&gspca_dev->vdev);
2321
2322 /*      PDEBUG(D_PROBE, "disconnect complete"); */
2323 }
2324 EXPORT_SYMBOL(gspca_disconnect);
2325
2326 #ifdef CONFIG_PM
2327 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
2328 {
2329         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2330
2331         if (!gspca_dev->streaming)
2332                 return 0;
2333         gspca_dev->frozen = 1;          /* avoid urb error messages */
2334         if (gspca_dev->sd_desc->stopN)
2335                 gspca_dev->sd_desc->stopN(gspca_dev);
2336         destroy_urbs(gspca_dev);
2337         gspca_input_destroy_urb(gspca_dev);
2338         gspca_set_alt0(gspca_dev);
2339         if (gspca_dev->sd_desc->stop0)
2340                 gspca_dev->sd_desc->stop0(gspca_dev);
2341         return 0;
2342 }
2343 EXPORT_SYMBOL(gspca_suspend);
2344
2345 int gspca_resume(struct usb_interface *intf)
2346 {
2347         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2348
2349         gspca_dev->frozen = 0;
2350         gspca_dev->sd_desc->init(gspca_dev);
2351         gspca_input_create_urb(gspca_dev);
2352         if (gspca_dev->streaming)
2353                 return gspca_init_transfer(gspca_dev);
2354         return 0;
2355 }
2356 EXPORT_SYMBOL(gspca_resume);
2357 #endif
2358 /* -- cam driver utility functions -- */
2359
2360 /* auto gain and exposure algorithm based on the knee algorithm described here:
2361    http://ytse.tricolour.net/docs/LowLightOptimization.html
2362
2363    Returns 0 if no changes were made, 1 if the gain and or exposure settings
2364    where changed. */
2365 int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
2366         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
2367 {
2368         int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
2369         const struct ctrl *gain_ctrl = NULL;
2370         const struct ctrl *exposure_ctrl = NULL;
2371         const struct ctrl *autogain_ctrl = NULL;
2372         int retval = 0;
2373
2374         for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
2375                 if (gspca_dev->ctrl_dis & (1 << i))
2376                         continue;
2377                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
2378                         gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2379                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
2380                         exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
2381                 if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
2382                         autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
2383         }
2384         if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
2385                 PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
2386                         "on cam without (auto)gain/exposure");
2387                 return 0;
2388         }
2389
2390         if (gain_ctrl->get(gspca_dev, &gain) ||
2391                         exposure_ctrl->get(gspca_dev, &exposure) ||
2392                         autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
2393                 return 0;
2394
2395         orig_gain = gain;
2396         orig_exposure = exposure;
2397
2398         /* If we are of a multiple of deadzone, do multiple steps to reach the
2399            desired lumination fast (with the risc of a slight overshoot) */
2400         steps = abs(desired_avg_lum - avg_lum) / deadzone;
2401
2402         PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2403                 avg_lum, desired_avg_lum, steps);
2404
2405         for (i = 0; i < steps; i++) {
2406                 if (avg_lum > desired_avg_lum) {
2407                         if (gain > gain_knee)
2408                                 gain--;
2409                         else if (exposure > exposure_knee)
2410                                 exposure--;
2411                         else if (gain > gain_ctrl->qctrl.default_value)
2412                                 gain--;
2413                         else if (exposure > exposure_ctrl->qctrl.minimum)
2414                                 exposure--;
2415                         else if (gain > gain_ctrl->qctrl.minimum)
2416                                 gain--;
2417                         else
2418                                 break;
2419                 } else {
2420                         if (gain < gain_ctrl->qctrl.default_value)
2421                                 gain++;
2422                         else if (exposure < exposure_knee)
2423                                 exposure++;
2424                         else if (gain < gain_knee)
2425                                 gain++;
2426                         else if (exposure < exposure_ctrl->qctrl.maximum)
2427                                 exposure++;
2428                         else if (gain < gain_ctrl->qctrl.maximum)
2429                                 gain++;
2430                         else
2431                                 break;
2432                 }
2433         }
2434
2435         if (gain != orig_gain) {
2436                 gain_ctrl->set(gspca_dev, gain);
2437                 retval = 1;
2438         }
2439         if (exposure != orig_exposure) {
2440                 exposure_ctrl->set(gspca_dev, exposure);
2441                 retval = 1;
2442         }
2443
2444         return retval;
2445 }
2446 EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
2447
2448 /* -- module insert / remove -- */
2449 static int __init gspca_init(void)
2450 {
2451         info("main v%d.%d.%d registered",
2452                 (DRIVER_VERSION_NUMBER >> 16) & 0xff,
2453                 (DRIVER_VERSION_NUMBER >> 8) & 0xff,
2454                 DRIVER_VERSION_NUMBER & 0xff);
2455         return 0;
2456 }
2457 static void __exit gspca_exit(void)
2458 {
2459         info("main deregistered");
2460 }
2461
2462 module_init(gspca_init);
2463 module_exit(gspca_exit);
2464
2465 #ifdef GSPCA_DEBUG
2466 module_param_named(debug, gspca_debug, int, 0644);
2467 MODULE_PARM_DESC(debug,
2468                 "Debug (bit) 0x01:error 0x02:probe 0x04:config"
2469                 " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
2470                 " 0x0100: v4l2");
2471 #endif