drivers/media/usb/stkwebcam/stk-webcam.c

   1 /*
   2  * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
   3  *
   4  * Copyright (C) 2006 Nicolas VIVIEN
   5  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
   6  *
   7  * Some parts are inspired from cafe_ccic.c
   8  * Copyright 2006-2007 Jonathan Corbet
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30
  31 #include <linux/dmi.h>
  32 #include <linux/usb.h>
  33 #include <linux/mm.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/videodev2.h>
  36 #include <media/v4l2-common.h>
  37 #include <media/v4l2-ioctl.h>
  38
  39 #include "stk-webcam.h"
  40
  41
  42 static int hflip = -1;
  43 module_param(hflip, int, 0444);
  44 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 0");
  45
  46 static int vflip = -1;
  47 module_param(vflip, int, 0444);
  48 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 0");
  49
  50 static int debug;
  51 module_param(debug, int, 0444);
  52 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
  53
  54 MODULE_LICENSE("GPL");
  55 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
  56 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
  57
  58 /* Some cameras have audio interfaces, we aren't interested in those */
  59 static struct usb_device_id stkwebcam_table[] = {
  60         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
  61         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
  62         { }
  63 };
  64 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
  65
  66 /* The stk webcam laptop module is mounted upside down in some laptops :( */
  67 static const struct dmi_system_id stk_upside_down_dmi_table[] = {
  68         {
  69                 .ident = "ASUS G1",
  70                 .matches = {
  71                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
  72                         DMI_MATCH(DMI_PRODUCT_NAME, "G1")
  73                 }
  74         },
  75         {}
  76 };
  77
  78
  79 /*
  80  * Basic stuff
  81  */
  82 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
  83 {
  84         struct usb_device *udev = dev->udev;
  85         int ret;
  86
  87         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  88                         0x01,
  89                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  90                         value,
  91                         index,
  92                         NULL,
  93                         0,
  94                         500);
  95         if (ret < 0)
  96                 return ret;
  97         else
  98                 return 0;
  99 }
 100
 101 int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
 102 {
 103         struct usb_device *udev = dev->udev;
 104         int ret;
 105
 106         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 107                         0x00,
 108                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 109                         0x00,
 110                         index,
 111                         (u8 *) value,
 112                         sizeof(u8),
 113                         500);
 114         if (ret < 0)
 115                 return ret;
 116         else
 117                 return 0;
 118 }
 119
 120 static int stk_start_stream(struct stk_camera *dev)
 121 {
 122         int value;
 123         int i, ret;
 124         int value_116, value_117;
 125
 126         if (!is_present(dev))
 127                 return -ENODEV;
 128         if (!is_memallocd(dev) || !is_initialised(dev)) {
 129                 STK_ERROR("FIXME: Buffers are not allocated\n");
 130                 return -EFAULT;
 131         }
 132         ret = usb_set_interface(dev->udev, 0, 5);
 133
 134         if (ret < 0)
 135                 STK_ERROR("usb_set_interface failed !\n");
 136         if (stk_sensor_wakeup(dev))
 137                 STK_ERROR("error awaking the sensor\n");
 138
 139         stk_camera_read_reg(dev, 0x0116, &value_116);
 140         stk_camera_read_reg(dev, 0x0117, &value_117);
 141
 142         stk_camera_write_reg(dev, 0x0116, 0x0000);
 143         stk_camera_write_reg(dev, 0x0117, 0x0000);
 144
 145         stk_camera_read_reg(dev, 0x0100, &value);
 146         stk_camera_write_reg(dev, 0x0100, value | 0x80);
 147
 148         stk_camera_write_reg(dev, 0x0116, value_116);
 149         stk_camera_write_reg(dev, 0x0117, value_117);
 150         for (i = 0; i < MAX_ISO_BUFS; i++) {
 151                 if (dev->isobufs[i].urb) {
 152                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
 153                         atomic_inc(&dev->urbs_used);
 154                         if (ret)
 155                                 return ret;
 156                 }
 157         }
 158         set_streaming(dev);
 159         return 0;
 160 }
 161
 162 static int stk_stop_stream(struct stk_camera *dev)
 163 {
 164         int value;
 165         int i;
 166         if (is_present(dev)) {
 167                 stk_camera_read_reg(dev, 0x0100, &value);
 168                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
 169                 if (dev->isobufs != NULL) {
 170                         for (i = 0; i < MAX_ISO_BUFS; i++) {
 171                                 if (dev->isobufs[i].urb)
 172                                         usb_kill_urb(dev->isobufs[i].urb);
 173                         }
 174                 }
 175                 unset_streaming(dev);
 176
 177                 if (usb_set_interface(dev->udev, 0, 0))
 178                         STK_ERROR("usb_set_interface failed !\n");
 179                 if (stk_sensor_sleep(dev))
 180                         STK_ERROR("error suspending the sensor\n");
 181         }
 182         return 0;
 183 }
 184
 185 /*
 186  * This seems to be the shortest init sequence we
 187  * must do in order to find the sensor
 188  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 189  * is also reset. Maybe powers down it?
 190  * Rest of values don't make a difference
 191  */
 192
 193 static struct regval stk1125_initvals[] = {
 194         /*TODO: What means this sequence? */
 195         {0x0000, 0x24},
 196         {0x0100, 0x21},
 197         {0x0002, 0x68},
 198         {0x0003, 0x80},
 199         {0x0005, 0x00},
 200         {0x0007, 0x03},
 201         {0x000d, 0x00},
 202         {0x000f, 0x02},
 203         {0x0300, 0x12},
 204         {0x0350, 0x41},
 205         {0x0351, 0x00},
 206         {0x0352, 0x00},
 207         {0x0353, 0x00},
 208         {0x0018, 0x10},
 209         {0x0019, 0x00},
 210         {0x001b, 0x0e},
 211         {0x001c, 0x46},
 212         {0x0300, 0x80},
 213         {0x001a, 0x04},
 214         {0x0110, 0x00},
 215         {0x0111, 0x00},
 216         {0x0112, 0x00},
 217         {0x0113, 0x00},
 218
 219         {0xffff, 0xff},
 220 };
 221
 222
 223 static int stk_initialise(struct stk_camera *dev)
 224 {
 225         struct regval *rv;
 226         int ret;
 227         if (!is_present(dev))
 228                 return -ENODEV;
 229         if (is_initialised(dev))
 230                 return 0;
 231         rv = stk1125_initvals;
 232         while (rv->reg != 0xffff) {
 233                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
 234                 if (ret)
 235                         return ret;
 236                 rv++;
 237         }
 238         if (stk_sensor_init(dev) == 0) {
 239                 set_initialised(dev);
 240                 return 0;
 241         } else
 242                 return -1;
 243 }
 244
 245 /* *********************************************** */
 246 /*
 247  * This function is called as an URB transfert is complete (Isochronous pipe).
 248  * So, the traitement is done in interrupt time, so it has be fast, not crash,
 249  * and not stall. Neat.
 250  */
 251 static void stk_isoc_handler(struct urb *urb)
 252 {
 253         int i;
 254         int ret;
 255         int framelen;
 256         unsigned long flags;
 257
 258         unsigned char *fill = NULL;
 259         unsigned char *iso_buf = NULL;
 260
 261         struct stk_camera *dev;
 262         struct stk_sio_buffer *fb;
 263
 264         dev = (struct stk_camera *) urb->context;
 265
 266         if (dev == NULL) {
 267                 STK_ERROR("isoc_handler called with NULL device !\n");
 268                 return;
 269         }
 270
 271         if (urb->status == -ENOENT || urb->status == -ECONNRESET
 272                 || urb->status == -ESHUTDOWN) {
 273                 atomic_dec(&dev->urbs_used);
 274                 return;
 275         }
 276
 277         spin_lock_irqsave(&dev->spinlock, flags);
 278
 279         if (urb->status != -EINPROGRESS && urb->status != 0) {
 280                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
 281                 goto resubmit;
 282         }
 283
 284         if (list_empty(&dev->sio_avail)) {
 285                 /*FIXME Stop streaming after a while */
 286                 (void) (printk_ratelimit() &&
 287                 STK_ERROR("isoc_handler without available buffer!\n"));
 288                 goto resubmit;
 289         }
 290         fb = list_first_entry(&dev->sio_avail,
 291                         struct stk_sio_buffer, list);
 292         fill = fb->buffer + fb->v4lbuf.bytesused;
 293
 294         for (i = 0; i < urb->number_of_packets; i++) {
 295                 if (urb->iso_frame_desc[i].status != 0) {
 296                         if (urb->iso_frame_desc[i].status != -EXDEV)
 297                                 STK_ERROR("Frame %d has error %d\n", i,
 298                                         urb->iso_frame_desc[i].status);
 299                         continue;
 300                 }
 301                 framelen = urb->iso_frame_desc[i].actual_length;
 302                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 303
 304                 if (framelen <= 4)
 305                         continue; /* no data */
 306
 307                 /*
 308                  * we found something informational from there
 309                  * the isoc frames have to type of headers
 310                  * type1: 00 xx 00 00 or 20 xx 00 00
 311                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 312                  * xx is a sequencer which has never been seen over 0x3f
 313                  * imho data written down looks like bayer, i see similarities
 314                  * after every 640 bytes
 315                  */
 316                 if (*iso_buf & 0x80) {
 317                         framelen -= 8;
 318                         iso_buf += 8;
 319                         /* This marks a new frame */
 320                         if (fb->v4lbuf.bytesused != 0
 321                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 322                                 (void) (printk_ratelimit() &&
 323                                 STK_ERROR("frame %d, "
 324                                         "bytesused=%d, skipping\n",
 325                                         i, fb->v4lbuf.bytesused));
 326                                 fb->v4lbuf.bytesused = 0;
 327                                 fill = fb->buffer;
 328                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
 329                                 if (list_is_singular(&dev->sio_avail)) {
 330                                         /* Always reuse the last buffer */
 331                                         fb->v4lbuf.bytesused = 0;
 332                                         fill = fb->buffer;
 333                                 } else {
 334                                         list_move_tail(dev->sio_avail.next,
 335                                                 &dev->sio_full);
 336                                         wake_up(&dev->wait_frame);
 337                                         fb = list_first_entry(&dev->sio_avail,
 338                                                 struct stk_sio_buffer, list);
 339                                         fb->v4lbuf.bytesused = 0;
 340                                         fill = fb->buffer;
 341                                 }
 342                         }
 343                 } else {
 344                         framelen -= 4;
 345                         iso_buf += 4;
 346                 }
 347
 348                 /* Our buffer is full !!! */
 349                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
 350                         (void) (printk_ratelimit() &&
 351                         STK_ERROR("Frame buffer overflow, lost sync\n"));
 352                         /*FIXME Do something here? */
 353                         continue;
 354                 }
 355                 spin_unlock_irqrestore(&dev->spinlock, flags);
 356                 memcpy(fill, iso_buf, framelen);
 357                 spin_lock_irqsave(&dev->spinlock, flags);
 358                 fill += framelen;
 359
 360                 /* New size of our buffer */
 361                 fb->v4lbuf.bytesused += framelen;
 362         }
 363
 364 resubmit:
 365         spin_unlock_irqrestore(&dev->spinlock, flags);
 366         urb->dev = dev->udev;
 367         ret = usb_submit_urb(urb, GFP_ATOMIC);
 368         if (ret != 0) {
 369                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
 370                         ret);
 371         }
 372 }
 373
 374 /* -------------------------------------------- */
 375
 376 static int stk_prepare_iso(struct stk_camera *dev)
 377 {
 378         void *kbuf;
 379         int i, j;
 380         struct urb *urb;
 381         struct usb_device *udev;
 382
 383         if (dev == NULL)
 384                 return -ENXIO;
 385         udev = dev->udev;
 386
 387         if (dev->isobufs)
 388                 STK_ERROR("isobufs already allocated. Bad\n");
 389         else
 390                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
 391                                        GFP_KERNEL);
 392         if (dev->isobufs == NULL) {
 393                 STK_ERROR("Unable to allocate iso buffers\n");
 394                 return -ENOMEM;
 395         }
 396         for (i = 0; i < MAX_ISO_BUFS; i++) {
 397                 if (dev->isobufs[i].data == NULL) {
 398                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 399                         if (kbuf == NULL) {
 400                                 STK_ERROR("Failed to allocate iso buffer %d\n",
 401                                         i);
 402                                 goto isobufs_out;
 403                         }
 404                         dev->isobufs[i].data = kbuf;
 405                 } else
 406                         STK_ERROR("isobuf data already allocated\n");
 407                 if (dev->isobufs[i].urb == NULL) {
 408                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 409                         if (urb == NULL) {
 410                                 STK_ERROR("Failed to allocate URB %d\n", i);
 411                                 goto isobufs_out;
 412                         }
 413                         dev->isobufs[i].urb = urb;
 414                 } else {
 415                         STK_ERROR("Killing URB\n");
 416                         usb_kill_urb(dev->isobufs[i].urb);
 417                         urb = dev->isobufs[i].urb;
 418                 }
 419                 urb->interval = 1;
 420                 urb->dev = udev;
 421                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 422                 urb->transfer_flags = URB_ISO_ASAP;
 423                 urb->transfer_buffer = dev->isobufs[i].data;
 424                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 425                 urb->complete = stk_isoc_handler;
 426                 urb->context = dev;
 427                 urb->start_frame = 0;
 428                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 429
 430                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 431                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 432                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 433                 }
 434         }
 435         set_memallocd(dev);
 436         return 0;
 437
 438 isobufs_out:
 439         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 440                 kfree(dev->isobufs[i].data);
 441         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 442                 usb_free_urb(dev->isobufs[i].urb);
 443         kfree(dev->isobufs);
 444         dev->isobufs = NULL;
 445         return -ENOMEM;
 446 }
 447
 448 static void stk_clean_iso(struct stk_camera *dev)
 449 {
 450         int i;
 451
 452         if (dev == NULL || dev->isobufs == NULL)
 453                 return;
 454
 455         for (i = 0; i < MAX_ISO_BUFS; i++) {
 456                 struct urb *urb;
 457
 458                 urb = dev->isobufs[i].urb;
 459                 if (urb) {
 460                         if (atomic_read(&dev->urbs_used) && is_present(dev))
 461                                 usb_kill_urb(urb);
 462                         usb_free_urb(urb);
 463                 }
 464                 kfree(dev->isobufs[i].data);
 465         }
 466         kfree(dev->isobufs);
 467         dev->isobufs = NULL;
 468         unset_memallocd(dev);
 469 }
 470
 471 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 472 {
 473         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 474         INIT_LIST_HEAD(&buf->list);
 475         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 476         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 477         if (buf->buffer == NULL)
 478                 return -ENOMEM;
 479         buf->mapcount = 0;
 480         buf->dev = dev;
 481         buf->v4lbuf.index = index;
 482         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 483         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 484         buf->v4lbuf.field = V4L2_FIELD_NONE;
 485         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 486         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 487         return 0;
 488 }
 489
 490 static int stk_free_sio_buffers(struct stk_camera *dev)
 491 {
 492         int i;
 493         int nbufs;
 494         unsigned long flags;
 495         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 496                 return 0;
 497         /*
 498         * If any buffers are mapped, we cannot free them at all.
 499         */
 500         for (i = 0; i < dev->n_sbufs; i++) {
 501                 if (dev->sio_bufs[i].mapcount > 0)
 502                         return -EBUSY;
 503         }
 504         /*
 505         * OK, let's do it.
 506         */
 507         spin_lock_irqsave(&dev->spinlock, flags);
 508         INIT_LIST_HEAD(&dev->sio_avail);
 509         INIT_LIST_HEAD(&dev->sio_full);
 510         nbufs = dev->n_sbufs;
 511         dev->n_sbufs = 0;
 512         spin_unlock_irqrestore(&dev->spinlock, flags);
 513         for (i = 0; i < nbufs; i++) {
 514                 if (dev->sio_bufs[i].buffer != NULL)
 515                         vfree(dev->sio_bufs[i].buffer);
 516         }
 517         kfree(dev->sio_bufs);
 518         dev->sio_bufs = NULL;
 519         return 0;
 520 }
 521
 522 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 523 {
 524         int i;
 525         if (dev->sio_bufs != NULL)
 526                 STK_ERROR("sio_bufs already allocated\n");
 527         else {
 528                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
 529                                 GFP_KERNEL);
 530                 if (dev->sio_bufs == NULL)
 531                         return -ENOMEM;
 532                 for (i = 0; i < n_sbufs; i++) {
 533                         if (stk_setup_siobuf(dev, i))
 534                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
 535                         dev->n_sbufs = i+1;
 536                 }
 537         }
 538         return 0;
 539 }
 540
 541 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 542 {
 543         int err;
 544         err = stk_prepare_iso(dev);
 545         if (err) {
 546                 stk_clean_iso(dev);
 547                 return err;
 548         }
 549         err = stk_prepare_sio_buffers(dev, n_sbufs);
 550         if (err) {
 551                 stk_free_sio_buffers(dev);
 552                 return err;
 553         }
 554         return 0;
 555 }
 556
 557 static void stk_free_buffers(struct stk_camera *dev)
 558 {
 559         stk_clean_iso(dev);
 560         stk_free_sio_buffers(dev);
 561 }
 562 /* -------------------------------------------- */
 563
 564 /* v4l file operations */
 565
 566 static int v4l_stk_open(struct file *fp)
 567 {
 568         static int first_init = 1; /* webcam LED management */
 569         struct stk_camera *dev;
 570         struct video_device *vdev;
 571
 572         vdev = video_devdata(fp);
 573         dev = vdev_to_camera(vdev);
 574
 575         if (dev == NULL || !is_present(dev))
 576                 return -ENXIO;
 577
 578         if (!first_init)
 579                 stk_camera_write_reg(dev, 0x0, 0x24);
 580         else
 581                 first_init = 0;
 582
 583         fp->private_data = dev;
 584         usb_autopm_get_interface(dev->interface);
 585
 586         return 0;
 587 }
 588
 589 static int v4l_stk_release(struct file *fp)
 590 {
 591         struct stk_camera *dev = fp->private_data;
 592
 593         if (dev->owner == fp) {
 594                 stk_stop_stream(dev);
 595                 stk_free_buffers(dev);
 596                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
 597                 unset_initialised(dev);
 598                 dev->owner = NULL;
 599         }
 600
 601         if (is_present(dev))
 602                 usb_autopm_put_interface(dev->interface);
 603
 604         return 0;
 605 }
 606
 607 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 608                 size_t count, loff_t *f_pos)
 609 {
 610         int i;
 611         int ret;
 612         unsigned long flags;
 613         struct stk_sio_buffer *sbuf;
 614         struct stk_camera *dev = fp->private_data;
 615
 616         if (!is_present(dev))
 617                 return -EIO;
 618         if (dev->owner && dev->owner != fp)
 619                 return -EBUSY;
 620         dev->owner = fp;
 621         if (!is_streaming(dev)) {
 622                 if (stk_initialise(dev)
 623                         || stk_allocate_buffers(dev, 3)
 624                         || stk_start_stream(dev))
 625                         return -ENOMEM;
 626                 spin_lock_irqsave(&dev->spinlock, flags);
 627                 for (i = 0; i < dev->n_sbufs; i++) {
 628                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 629                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 630                 }
 631                 spin_unlock_irqrestore(&dev->spinlock, flags);
 632         }
 633         if (*f_pos == 0) {
 634                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 635                         return -EWOULDBLOCK;
 636                 ret = wait_event_interruptible(dev->wait_frame,
 637                         !list_empty(&dev->sio_full) || !is_present(dev));
 638                 if (ret)
 639                         return ret;
 640                 if (!is_present(dev))
 641                         return -EIO;
 642         }
 643         if (count + *f_pos > dev->frame_size)
 644                 count = dev->frame_size - *f_pos;
 645         spin_lock_irqsave(&dev->spinlock, flags);
 646         if (list_empty(&dev->sio_full)) {
 647                 spin_unlock_irqrestore(&dev->spinlock, flags);
 648                 STK_ERROR("BUG: No siobufs ready\n");
 649                 return 0;
 650         }
 651         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 652         spin_unlock_irqrestore(&dev->spinlock, flags);
 653
 654         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 655                 return -EFAULT;
 656
 657         *f_pos += count;
 658
 659         if (*f_pos >= dev->frame_size) {
 660                 *f_pos = 0;
 661                 spin_lock_irqsave(&dev->spinlock, flags);
 662                 list_move_tail(&sbuf->list, &dev->sio_avail);
 663                 spin_unlock_irqrestore(&dev->spinlock, flags);
 664         }
 665         return count;
 666 }
 667
 668 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
 669 {
 670         struct stk_camera *dev = fp->private_data;
 671
 672         poll_wait(fp, &dev->wait_frame, wait);
 673
 674         if (!is_present(dev))
 675                 return POLLERR;
 676
 677         if (!list_empty(&dev->sio_full))
 678                 return POLLIN | POLLRDNORM;
 679
 680         return 0;
 681 }
 682
 683
 684 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 685 {
 686         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 687         sbuf->mapcount++;
 688 }
 689 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 690 {
 691         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 692         sbuf->mapcount--;
 693         if (sbuf->mapcount == 0)
 694                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 695 }
 696 static const struct vm_operations_struct stk_v4l_vm_ops = {
 697         .open = stk_v4l_vm_open,
 698         .close = stk_v4l_vm_close
 699 };
 700
 701 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 702 {
 703         unsigned int i;
 704         int ret;
 705         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 706         struct stk_camera *dev = fp->private_data;
 707         struct stk_sio_buffer *sbuf = NULL;
 708
 709         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 710                 return -EINVAL;
 711
 712         for (i = 0; i < dev->n_sbufs; i++) {
 713                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 714                         sbuf = dev->sio_bufs + i;
 715                         break;
 716                 }
 717         }
 718         if (sbuf == NULL)
 719                 return -EINVAL;
 720         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 721         if (ret)
 722                 return ret;
 723         vma->vm_flags |= VM_DONTEXPAND;
 724         vma->vm_private_data = sbuf;
 725         vma->vm_ops = &stk_v4l_vm_ops;
 726         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 727         stk_v4l_vm_open(vma);
 728         return 0;
 729 }
 730
 731 /* v4l ioctl handlers */
 732
 733 static int stk_vidioc_querycap(struct file *filp,
 734                 void *priv, struct v4l2_capability *cap)
 735 {
 736         strcpy(cap->driver, "stk");
 737         strcpy(cap->card, "stk");
 738         cap->version = DRIVER_VERSION_NUM;
 739
 740         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 741                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 742         return 0;
 743 }
 744
 745 static int stk_vidioc_enum_input(struct file *filp,
 746                 void *priv, struct v4l2_input *input)
 747 {
 748         if (input->index != 0)
 749                 return -EINVAL;
 750
 751         strcpy(input->name, "Syntek USB Camera");
 752         input->type = V4L2_INPUT_TYPE_CAMERA;
 753         return 0;
 754 }
 755
 756
 757 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 758 {
 759         *i = 0;
 760         return 0;
 761 }
 762
 763 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 764 {
 765         if (i != 0)
 766                 return -EINVAL;
 767         else
 768                 return 0;
 769 }
 770
 771 /* from vivi.c */
 772 static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
 773 {
 774         return 0;
 775 }
 776
 777 /* List of all V4Lv2 controls supported by the driver */
 778 static struct v4l2_queryctrl stk_controls[] = {
 779         {
 780                 .id      = V4L2_CID_BRIGHTNESS,
 781                 .type    = V4L2_CTRL_TYPE_INTEGER,
 782                 .name    = "Brightness",
 783                 .minimum = 0,
 784                 .maximum = 0xffff,
 785                 .step    = 0x0100,
 786                 .default_value = 0x6000,
 787         },
 788         {
 789                 .id      = V4L2_CID_HFLIP,
 790                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 791                 .name    = "Horizontal Flip",
 792                 .minimum = 0,
 793                 .maximum = 1,
 794                 .step    = 1,
 795                 .default_value = 1,
 796         },
 797         {
 798                 .id      = V4L2_CID_VFLIP,
 799                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 800                 .name    = "Vertical Flip",
 801                 .minimum = 0,
 802                 .maximum = 1,
 803                 .step    = 1,
 804                 .default_value = 1,
 805         },
 806 };
 807
 808 static int stk_vidioc_queryctrl(struct file *filp,
 809                 void *priv, struct v4l2_queryctrl *c)
 810 {
 811         int i;
 812         int nbr;
 813         nbr = ARRAY_SIZE(stk_controls);
 814
 815         for (i = 0; i < nbr; i++) {
 816                 if (stk_controls[i].id == c->id) {
 817                         memcpy(c, &stk_controls[i],
 818                                 sizeof(struct v4l2_queryctrl));
 819                         return 0;
 820                 }
 821         }
 822         return -EINVAL;
 823 }
 824
 825 static int stk_vidioc_g_ctrl(struct file *filp,
 826                 void *priv, struct v4l2_control *c)
 827 {
 828         struct stk_camera *dev = priv;
 829         switch (c->id) {
 830         case V4L2_CID_BRIGHTNESS:
 831                 c->value = dev->vsettings.brightness;
 832                 break;
 833         case V4L2_CID_HFLIP:
 834                 if (dmi_check_system(stk_upside_down_dmi_table))
 835                         c->value = !dev->vsettings.hflip;
 836                 else
 837                         c->value = dev->vsettings.hflip;
 838                 break;
 839         case V4L2_CID_VFLIP:
 840                 if (dmi_check_system(stk_upside_down_dmi_table))
 841                         c->value = !dev->vsettings.vflip;
 842                 else
 843                         c->value = dev->vsettings.vflip;
 844                 break;
 845         default:
 846                 return -EINVAL;
 847         }
 848         return 0;
 849 }
 850
 851 static int stk_vidioc_s_ctrl(struct file *filp,
 852                 void *priv, struct v4l2_control *c)
 853 {
 854         struct stk_camera *dev = priv;
 855         switch (c->id) {
 856         case V4L2_CID_BRIGHTNESS:
 857                 dev->vsettings.brightness = c->value;
 858                 return stk_sensor_set_brightness(dev, c->value >> 8);
 859         case V4L2_CID_HFLIP:
 860                 if (dmi_check_system(stk_upside_down_dmi_table))
 861                         dev->vsettings.hflip = !c->value;
 862                 else
 863                         dev->vsettings.hflip = c->value;
 864                 return 0;
 865         case V4L2_CID_VFLIP:
 866                 if (dmi_check_system(stk_upside_down_dmi_table))
 867                         dev->vsettings.vflip = !c->value;
 868                 else
 869                         dev->vsettings.vflip = c->value;
 870                 return 0;
 871         default:
 872                 return -EINVAL;
 873         }
 874         return 0;
 875 }
 876
 877
 878 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
 879                 void *priv, struct v4l2_fmtdesc *fmtd)
 880 {
 881         switch (fmtd->index) {
 882         case 0:
 883                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 884                 strcpy(fmtd->description, "r5g6b5");
 885                 break;
 886         case 1:
 887                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 888                 strcpy(fmtd->description, "r5g6b5BE");
 889                 break;
 890         case 2:
 891                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 892                 strcpy(fmtd->description, "yuv4:2:2");
 893                 break;
 894         case 3:
 895                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 896                 strcpy(fmtd->description, "Raw bayer");
 897                 break;
 898         case 4:
 899                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 900                 strcpy(fmtd->description, "yuv4:2:2");
 901                 break;
 902         default:
 903                 return -EINVAL;
 904         }
 905         return 0;
 906 }
 907
 908 static struct stk_size {
 909         unsigned w;
 910         unsigned h;
 911         enum stk_mode m;
 912 } stk_sizes[] = {
 913         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
 914         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
 915         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
 916         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
 917         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
 918 };
 919
 920 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 921                 void *priv, struct v4l2_format *f)
 922 {
 923         struct v4l2_pix_format *pix_format = &f->fmt.pix;
 924         struct stk_camera *dev = priv;
 925         int i;
 926
 927         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
 928                         stk_sizes[i].m != dev->vsettings.mode; i++)
 929                 ;
 930         if (i == ARRAY_SIZE(stk_sizes)) {
 931                 STK_ERROR("ERROR: mode invalid\n");
 932                 return -EINVAL;
 933         }
 934         pix_format->width = stk_sizes[i].w;
 935         pix_format->height = stk_sizes[i].h;
 936         pix_format->field = V4L2_FIELD_NONE;
 937         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
 938         pix_format->pixelformat = dev->vsettings.palette;
 939         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 940                 pix_format->bytesperline = pix_format->width;
 941         else
 942                 pix_format->bytesperline = 2 * pix_format->width;
 943         pix_format->sizeimage = pix_format->bytesperline
 944                                 * pix_format->height;
 945         return 0;
 946 }
 947
 948 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 949                 void *priv, struct v4l2_format *fmtd)
 950 {
 951         int i;
 952         switch (fmtd->fmt.pix.pixelformat) {
 953         case V4L2_PIX_FMT_RGB565:
 954         case V4L2_PIX_FMT_RGB565X:
 955         case V4L2_PIX_FMT_UYVY:
 956         case V4L2_PIX_FMT_YUYV:
 957         case V4L2_PIX_FMT_SBGGR8:
 958                 break;
 959         default:
 960                 return -EINVAL;
 961         }
 962         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
 963                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
 964                         break;
 965         }
 966         if (i == ARRAY_SIZE(stk_sizes)
 967                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
 968                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 969                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
 970                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
 971                 fmtd->fmt.pix.priv = i - 1;
 972         } else {
 973                 fmtd->fmt.pix.height = stk_sizes[i].h;
 974                 fmtd->fmt.pix.width = stk_sizes[i].w;
 975                 fmtd->fmt.pix.priv = i;
 976         }
 977
 978         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
 979         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 980         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
 981                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
 982         else
 983                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 984         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 985                 * fmtd->fmt.pix.height;
 986         return 0;
 987 }
 988
 989 static int stk_setup_format(struct stk_camera *dev)
 990 {
 991         int i = 0;
 992         int depth;
 993         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 994                 depth = 1;
 995         else
 996                 depth = 2;
 997         while (i < ARRAY_SIZE(stk_sizes) &&
 998                         stk_sizes[i].m != dev->vsettings.mode)
 999                 i++;
1000         if (i == ARRAY_SIZE(stk_sizes)) {
1001                 STK_ERROR("Something is broken in %s\n", __func__);
1002                 return -EFAULT;
1003         }
1004         /* This registers controls some timings, not sure of what. */
1005         stk_camera_write_reg(dev, 0x001b, 0x0e);
1006         if (dev->vsettings.mode == MODE_SXGA)
1007                 stk_camera_write_reg(dev, 0x001c, 0x0e);
1008         else
1009                 stk_camera_write_reg(dev, 0x001c, 0x46);
1010         /*
1011          * Registers 0x0115 0x0114 are the size of each line (bytes),
1012          * regs 0x0117 0x0116 are the heigth of the image.
1013          */
1014         stk_camera_write_reg(dev, 0x0115,
1015                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
1016         stk_camera_write_reg(dev, 0x0114,
1017                 (stk_sizes[i].w * depth) & 0xff);
1018         stk_camera_write_reg(dev, 0x0117,
1019                 (stk_sizes[i].h >> 8) & 0xff);
1020         stk_camera_write_reg(dev, 0x0116,
1021                 stk_sizes[i].h & 0xff);
1022         return stk_sensor_configure(dev);
1023 }
1024
1025 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
1026                 void *priv, struct v4l2_format *fmtd)
1027 {
1028         int ret;
1029         struct stk_camera *dev = priv;
1030
1031         if (dev == NULL)
1032                 return -ENODEV;
1033         if (!is_present(dev))
1034                 return -ENODEV;
1035         if (is_streaming(dev))
1036                 return -EBUSY;
1037         if (dev->owner && dev->owner != filp)
1038                 return -EBUSY;
1039         ret = stk_vidioc_try_fmt_vid_cap(filp, priv, fmtd);
1040         if (ret)
1041                 return ret;
1042         dev->owner = filp;
1043
1044         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1045         stk_free_buffers(dev);
1046         dev->frame_size = fmtd->fmt.pix.sizeimage;
1047         dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
1048
1049         stk_initialise(dev);
1050         return stk_setup_format(dev);
1051 }
1052
1053 static int stk_vidioc_reqbufs(struct file *filp,
1054                 void *priv, struct v4l2_requestbuffers *rb)
1055 {
1056         struct stk_camera *dev = priv;
1057
1058         if (dev == NULL)
1059                 return -ENODEV;
1060         if (rb->memory != V4L2_MEMORY_MMAP)
1061                 return -EINVAL;
1062         if (is_streaming(dev)
1063                 || (dev->owner && dev->owner != filp))
1064                 return -EBUSY;
1065         dev->owner = filp;
1066
1067         /*FIXME If they ask for zero, we must stop streaming and free */
1068         if (rb->count < 3)
1069                 rb->count = 3;
1070         /* Arbitrary limit */
1071         else if (rb->count > 5)
1072                 rb->count = 5;
1073
1074         stk_allocate_buffers(dev, rb->count);
1075         rb->count = dev->n_sbufs;
1076         return 0;
1077 }
1078
1079 static int stk_vidioc_querybuf(struct file *filp,
1080                 void *priv, struct v4l2_buffer *buf)
1081 {
1082         struct stk_camera *dev = priv;
1083         struct stk_sio_buffer *sbuf;
1084
1085         if (buf->index >= dev->n_sbufs)
1086                 return -EINVAL;
1087         sbuf = dev->sio_bufs + buf->index;
1088         *buf = sbuf->v4lbuf;
1089         return 0;
1090 }
1091
1092 static int stk_vidioc_qbuf(struct file *filp,
1093                 void *priv, struct v4l2_buffer *buf)
1094 {
1095         struct stk_camera *dev = priv;
1096         struct stk_sio_buffer *sbuf;
1097         unsigned long flags;
1098
1099         if (buf->memory != V4L2_MEMORY_MMAP)
1100                 return -EINVAL;
1101
1102         if (buf->index >= dev->n_sbufs)
1103                 return -EINVAL;
1104         sbuf = dev->sio_bufs + buf->index;
1105         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1106                 return 0;
1107         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1108         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1109         spin_lock_irqsave(&dev->spinlock, flags);
1110         list_add_tail(&sbuf->list, &dev->sio_avail);
1111         *buf = sbuf->v4lbuf;
1112         spin_unlock_irqrestore(&dev->spinlock, flags);
1113         return 0;
1114 }
1115
1116 static int stk_vidioc_dqbuf(struct file *filp,
1117                 void *priv, struct v4l2_buffer *buf)
1118 {
1119         struct stk_camera *dev = priv;
1120         struct stk_sio_buffer *sbuf;
1121         unsigned long flags;
1122         int ret;
1123
1124         if (!is_streaming(dev))
1125                 return -EINVAL;
1126
1127         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1128                 return -EWOULDBLOCK;
1129         ret = wait_event_interruptible(dev->wait_frame,
1130                 !list_empty(&dev->sio_full) || !is_present(dev));
1131         if (ret)
1132                 return ret;
1133         if (!is_present(dev))
1134                 return -EIO;
1135
1136         spin_lock_irqsave(&dev->spinlock, flags);
1137         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1138         list_del_init(&sbuf->list);
1139         spin_unlock_irqrestore(&dev->spinlock, flags);
1140         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1141         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1142         sbuf->v4lbuf.sequence = ++dev->sequence;
1143         v4l2_get_timestamp(&sbuf->v4lbuf.timestamp);
1144
1145         *buf = sbuf->v4lbuf;
1146         return 0;
1147 }
1148
1149 static int stk_vidioc_streamon(struct file *filp,
1150                 void *priv, enum v4l2_buf_type type)
1151 {
1152         struct stk_camera *dev = priv;
1153         if (is_streaming(dev))
1154                 return 0;
1155         if (dev->sio_bufs == NULL)
1156                 return -EINVAL;
1157         dev->sequence = 0;
1158         return stk_start_stream(dev);
1159 }
1160
1161 static int stk_vidioc_streamoff(struct file *filp,
1162                 void *priv, enum v4l2_buf_type type)
1163 {
1164         struct stk_camera *dev = priv;
1165         unsigned long flags;
1166         int i;
1167         stk_stop_stream(dev);
1168         spin_lock_irqsave(&dev->spinlock, flags);
1169         INIT_LIST_HEAD(&dev->sio_avail);
1170         INIT_LIST_HEAD(&dev->sio_full);
1171         for (i = 0; i < dev->n_sbufs; i++) {
1172                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1173                 dev->sio_bufs[i].v4lbuf.flags = 0;
1174         }
1175         spin_unlock_irqrestore(&dev->spinlock, flags);
1176         return 0;
1177 }
1178
1179
1180 static int stk_vidioc_g_parm(struct file *filp,
1181                 void *priv, struct v4l2_streamparm *sp)
1182 {
1183         /*FIXME This is not correct */
1184         sp->parm.capture.timeperframe.numerator = 1;
1185         sp->parm.capture.timeperframe.denominator = 30;
1186         sp->parm.capture.readbuffers = 2;
1187         return 0;
1188 }
1189
1190 static int stk_vidioc_enum_framesizes(struct file *filp,
1191                 void *priv, struct v4l2_frmsizeenum *frms)
1192 {
1193         if (frms->index >= ARRAY_SIZE(stk_sizes))
1194                 return -EINVAL;
1195         switch (frms->pixel_format) {
1196         case V4L2_PIX_FMT_RGB565:
1197         case V4L2_PIX_FMT_RGB565X:
1198         case V4L2_PIX_FMT_UYVY:
1199         case V4L2_PIX_FMT_YUYV:
1200         case V4L2_PIX_FMT_SBGGR8:
1201                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1202                 frms->discrete.width = stk_sizes[frms->index].w;
1203                 frms->discrete.height = stk_sizes[frms->index].h;
1204                 return 0;
1205         default: return -EINVAL;
1206         }
1207 }
1208
1209 static struct v4l2_file_operations v4l_stk_fops = {
1210         .owner = THIS_MODULE,
1211         .open = v4l_stk_open,
1212         .release = v4l_stk_release,
1213         .read = v4l_stk_read,
1214         .poll = v4l_stk_poll,
1215         .mmap = v4l_stk_mmap,
1216         .ioctl = video_ioctl2,
1217 };
1218
1219 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1220         .vidioc_querycap = stk_vidioc_querycap,
1221         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1222         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1223         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1224         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1225         .vidioc_enum_input = stk_vidioc_enum_input,
1226         .vidioc_s_input = stk_vidioc_s_input,
1227         .vidioc_g_input = stk_vidioc_g_input,
1228         .vidioc_s_std = stk_vidioc_s_std,
1229         .vidioc_reqbufs = stk_vidioc_reqbufs,
1230         .vidioc_querybuf = stk_vidioc_querybuf,
1231         .vidioc_qbuf = stk_vidioc_qbuf,
1232         .vidioc_dqbuf = stk_vidioc_dqbuf,
1233         .vidioc_streamon = stk_vidioc_streamon,
1234         .vidioc_streamoff = stk_vidioc_streamoff,
1235         .vidioc_queryctrl = stk_vidioc_queryctrl,
1236         .vidioc_g_ctrl = stk_vidioc_g_ctrl,
1237         .vidioc_s_ctrl = stk_vidioc_s_ctrl,
1238         .vidioc_g_parm = stk_vidioc_g_parm,
1239         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1240 };
1241
1242 static void stk_v4l_dev_release(struct video_device *vd)
1243 {
1244         struct stk_camera *dev = vdev_to_camera(vd);
1245
1246         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1247                 STK_ERROR("We are leaking memory\n");
1248         usb_put_intf(dev->interface);
1249         kfree(dev);
1250 }
1251
1252 static struct video_device stk_v4l_data = {
1253         .name = "stkwebcam",
1254         .tvnorms = V4L2_STD_UNKNOWN,
1255         .current_norm = V4L2_STD_UNKNOWN,
1256         .fops = &v4l_stk_fops,
1257         .ioctl_ops = &v4l_stk_ioctl_ops,
1258         .release = stk_v4l_dev_release,
1259 };
1260
1261
1262 static int stk_register_video_device(struct stk_camera *dev)
1263 {
1264         int err;
1265
1266         dev->vdev = stk_v4l_data;
1267         dev->vdev.debug = debug;
1268         dev->vdev.parent = &dev->interface->dev;
1269         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1270         if (err)
1271                 STK_ERROR("v4l registration failed\n");
1272         else
1273                 STK_INFO("Syntek USB2.0 Camera is now controlling device %s\n",
1274                          video_device_node_name(&dev->vdev));
1275         return err;
1276 }
1277
1278
1279 /* USB Stuff */
1280
1281 static int stk_camera_probe(struct usb_interface *interface,
1282                 const struct usb_device_id *id)
1283 {
1284         int i;
1285         int err = 0;
1286
1287         struct stk_camera *dev = NULL;
1288         struct usb_device *udev = interface_to_usbdev(interface);
1289         struct usb_host_interface *iface_desc;
1290         struct usb_endpoint_descriptor *endpoint;
1291
1292         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1293         if (dev == NULL) {
1294                 STK_ERROR("Out of memory !\n");
1295                 return -ENOMEM;
1296         }
1297
1298         spin_lock_init(&dev->spinlock);
1299         init_waitqueue_head(&dev->wait_frame);
1300
1301         dev->udev = udev;
1302         dev->interface = interface;
1303         usb_get_intf(interface);
1304
1305         if (hflip != -1)
1306                 dev->vsettings.hflip = hflip;
1307         else if (dmi_check_system(stk_upside_down_dmi_table))
1308                 dev->vsettings.hflip = 1;
1309         else
1310                 dev->vsettings.hflip = 0;
1311         if (vflip != -1)
1312                 dev->vsettings.vflip = vflip;
1313         else if (dmi_check_system(stk_upside_down_dmi_table))
1314                 dev->vsettings.vflip = 1;
1315         else
1316                 dev->vsettings.vflip = 0;
1317         dev->n_sbufs = 0;
1318         set_present(dev);
1319
1320         /* Set up the endpoint information
1321          * use only the first isoc-in endpoint
1322          * for the current alternate setting */
1323         iface_desc = interface->cur_altsetting;
1324
1325         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1326                 endpoint = &iface_desc->endpoint[i].desc;
1327
1328                 if (!dev->isoc_ep
1329                         && usb_endpoint_is_isoc_in(endpoint)) {
1330                         /* we found an isoc in endpoint */
1331                         dev->isoc_ep = usb_endpoint_num(endpoint);
1332                         break;
1333                 }
1334         }
1335         if (!dev->isoc_ep) {
1336                 STK_ERROR("Could not find isoc-in endpoint");
1337                 err = -ENODEV;
1338                 goto error;
1339         }
1340         dev->vsettings.brightness = 0x7fff;
1341         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1342         dev->vsettings.mode = MODE_VGA;
1343         dev->frame_size = 640 * 480 * 2;
1344
1345         INIT_LIST_HEAD(&dev->sio_avail);
1346         INIT_LIST_HEAD(&dev->sio_full);
1347
1348         usb_set_intfdata(interface, dev);
1349
1350         err = stk_register_video_device(dev);
1351         if (err)
1352                 goto error;
1353
1354         return 0;
1355
1356 error:
1357         kfree(dev);
1358         return err;
1359 }
1360
1361 static void stk_camera_disconnect(struct usb_interface *interface)
1362 {
1363         struct stk_camera *dev = usb_get_intfdata(interface);
1364
1365         usb_set_intfdata(interface, NULL);
1366         unset_present(dev);
1367
1368         wake_up_interruptible(&dev->wait_frame);
1369
1370         STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
1371                  video_device_node_name(&dev->vdev));
1372
1373         video_unregister_device(&dev->vdev);
1374 }
1375
1376 #ifdef CONFIG_PM
1377 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1378 {
1379         struct stk_camera *dev = usb_get_intfdata(intf);
1380         if (is_streaming(dev)) {
1381                 stk_stop_stream(dev);
1382                 /* yes, this is ugly */
1383                 set_streaming(dev);
1384         }
1385         return 0;
1386 }
1387
1388 static int stk_camera_resume(struct usb_interface *intf)
1389 {
1390         struct stk_camera *dev = usb_get_intfdata(intf);
1391         if (!is_initialised(dev))
1392                 return 0;
1393         unset_initialised(dev);
1394         stk_initialise(dev);
1395         stk_camera_write_reg(dev, 0x0, 0x49);
1396         stk_setup_format(dev);
1397         if (is_streaming(dev))
1398                 stk_start_stream(dev);
1399         return 0;
1400 }
1401 #endif
1402
1403 static struct usb_driver stk_camera_driver = {
1404         .name = "stkwebcam",
1405         .probe = stk_camera_probe,
1406         .disconnect = stk_camera_disconnect,
1407         .id_table = stkwebcam_table,
1408 #ifdef CONFIG_PM
1409         .suspend = stk_camera_suspend,
1410         .resume = stk_camera_resume,
1411 #endif
1412 };
1413
1414 module_usb_driver(stk_camera_driver);