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   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 #include <linux/kref.h>
  31
  32 #include <linux/usb.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/videodev2.h>
  35 #include <media/v4l2-common.h>
  36
  37 #include "stk-webcam.h"
  38
  39
  40 static int hflip = 1;
  41 module_param(hflip, bool, 0444);
  42 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");
  43
  44 static int vflip = 1;
  45 module_param(vflip, bool, 0444);
  46 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");
  47
  48 static int debug;
  49 module_param(debug, int, 0444);
  50 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
  51
  52 MODULE_LICENSE("GPL");
  53 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
  54 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
  55
  56
  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 static void stk_camera_cleanup(struct kref *kref)
  67 {
  68         struct stk_camera *dev = to_stk_camera(kref);
  69
  70         STK_INFO("Syntek USB2.0 Camera release resources"
  71                 " video device /dev/video%d\n", dev->vdev.minor);
  72         video_unregister_device(&dev->vdev);
  73         dev->vdev.priv = NULL;
  74
  75         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
  76                 STK_ERROR("We are leaking memory\n");
  77         usb_put_intf(dev->interface);
  78         kfree(dev);
  79 }
  80
  81
  82 /*
  83  * Basic stuff
  84  */
  85 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
  86 {
  87         struct usb_device *udev = dev->udev;
  88         int ret;
  89
  90         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  91                         0x01,
  92                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  93                         value,
  94                         index,
  95                         NULL,
  96                         0,
  97                         500);
  98         if (ret < 0)
  99                 return ret;
 100         else
 101                 return 0;
 102 }
 103
 104 int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
 105 {
 106         struct usb_device *udev = dev->udev;
 107         int ret;
 108
 109         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 110                         0x00,
 111                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 112                         0x00,
 113                         index,
 114                         (u8 *) value,
 115                         sizeof(u8),
 116                         500);
 117         if (ret < 0)
 118                 return ret;
 119         else
 120                 return 0;
 121 }
 122
 123 static int stk_start_stream(struct stk_camera *dev)
 124 {
 125         int value;
 126         int i, ret;
 127         int value_116, value_117;
 128
 129         if (!is_present(dev))
 130                 return -ENODEV;
 131         if (!is_memallocd(dev) || !is_initialised(dev)) {
 132                 STK_ERROR("FIXME: Buffers are not allocated\n");
 133                 return -EFAULT;
 134         }
 135         ret = usb_set_interface(dev->udev, 0, 5);
 136
 137         if (ret < 0)
 138                 STK_ERROR("usb_set_interface failed !\n");
 139         if (stk_sensor_wakeup(dev))
 140                 STK_ERROR("error awaking the sensor\n");
 141
 142         stk_camera_read_reg(dev, 0x0116, &value_116);
 143         stk_camera_read_reg(dev, 0x0117, &value_117);
 144
 145         stk_camera_write_reg(dev, 0x0116, 0x0000);
 146         stk_camera_write_reg(dev, 0x0117, 0x0000);
 147
 148         stk_camera_read_reg(dev, 0x0100, &value);
 149         stk_camera_write_reg(dev, 0x0100, value | 0x80);
 150
 151         stk_camera_write_reg(dev, 0x0116, value_116);
 152         stk_camera_write_reg(dev, 0x0117, value_117);
 153         for (i = 0; i < MAX_ISO_BUFS; i++) {
 154                 if (dev->isobufs[i].urb) {
 155                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
 156                         atomic_inc(&dev->urbs_used);
 157                         if (ret)
 158                                 return ret;
 159                 }
 160         }
 161         set_streaming(dev);
 162         return 0;
 163 }
 164
 165 static int stk_stop_stream(struct stk_camera *dev)
 166 {
 167         int value;
 168         int i;
 169         if (is_present(dev)) {
 170                 stk_camera_read_reg(dev, 0x0100, &value);
 171                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
 172                 if (dev->isobufs != NULL) {
 173                         for (i = 0; i < MAX_ISO_BUFS; i++) {
 174                                 if (dev->isobufs[i].urb)
 175                                         usb_kill_urb(dev->isobufs[i].urb);
 176                         }
 177                 }
 178                 unset_streaming(dev);
 179
 180                 if (usb_set_interface(dev->udev, 0, 0))
 181                         STK_ERROR("usb_set_interface failed !\n");
 182                 if (stk_sensor_sleep(dev))
 183                         STK_ERROR("error suspending the sensor\n");
 184         }
 185         return 0;
 186 }
 187
 188 /*
 189  * This seems to be the shortest init sequence we
 190  * must do in order to find the sensor
 191  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 192  * is also reset. Maybe powers down it?
 193  * Rest of values don't make a difference
 194  */
 195
 196 static struct regval stk1125_initvals[] = {
 197         /*TODO: What means this sequence? */
 198         {0x0000, 0x24},
 199         {0x0100, 0x21},
 200         {0x0002, 0x68},
 201         {0x0003, 0x80},
 202         {0x0005, 0x00},
 203         {0x0007, 0x03},
 204         {0x000d, 0x00},
 205         {0x000f, 0x02},
 206         {0x0300, 0x12},
 207         {0x0350, 0x41},
 208         {0x0351, 0x00},
 209         {0x0352, 0x00},
 210         {0x0353, 0x00},
 211         {0x0018, 0x10},
 212         {0x0019, 0x00},
 213         {0x001b, 0x0e},
 214         {0x001c, 0x46},
 215         {0x0300, 0x80},
 216         {0x001a, 0x04},
 217         {0x0110, 0x00},
 218         {0x0111, 0x00},
 219         {0x0112, 0x00},
 220         {0x0113, 0x00},
 221
 222         {0xffff, 0xff},
 223 };
 224
 225
 226 static int stk_initialise(struct stk_camera *dev)
 227 {
 228         struct regval *rv;
 229         int ret;
 230         if (!is_present(dev))
 231                 return -ENODEV;
 232         if (is_initialised(dev))
 233                 return 0;
 234         rv = stk1125_initvals;
 235         while (rv->reg != 0xffff) {
 236                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
 237                 if (ret)
 238                         return ret;
 239                 rv++;
 240         }
 241         if (stk_sensor_init(dev) == 0) {
 242                 set_initialised(dev);
 243                 return 0;
 244         } else
 245                 return -1;
 246 }
 247
 248 /* sysfs functions */
 249 /*FIXME cleanup this */
 250
 251 static ssize_t show_brightness(struct device *class,
 252                         struct device_attribute *attr, char *buf)
 253 {
 254         struct video_device *vdev = to_video_device(class);
 255         struct stk_camera *dev = vdev_to_camera(vdev);
 256
 257         return sprintf(buf, "%X\n", dev->vsettings.brightness);
 258 }
 259
 260 static ssize_t store_brightness(struct device *class,
 261                 struct device_attribute *attr, const char *buf, size_t count)
 262 {
 263         char *endp;
 264         unsigned long value;
 265         int ret;
 266
 267         struct video_device *vdev = to_video_device(class);
 268         struct stk_camera *dev = vdev_to_camera(vdev);
 269
 270         value = simple_strtoul(buf, &endp, 16);
 271
 272         dev->vsettings.brightness = (int) value;
 273
 274         ret = stk_sensor_set_brightness(dev, value >> 8);
 275         if (ret)
 276                 return ret;
 277         else
 278                 return count;
 279 }
 280
 281 static ssize_t show_hflip(struct device *class,
 282                 struct device_attribute *attr, char *buf)
 283 {
 284         struct video_device *vdev = to_video_device(class);
 285         struct stk_camera *dev = vdev_to_camera(vdev);
 286
 287         return sprintf(buf, "%d\n", dev->vsettings.hflip);
 288 }
 289
 290 static ssize_t store_hflip(struct device *class,
 291                 struct device_attribute *attr, const char *buf, size_t count)
 292 {
 293         struct video_device *vdev = to_video_device(class);
 294         struct stk_camera *dev = vdev_to_camera(vdev);
 295
 296         if (strncmp(buf, "1", 1) == 0)
 297                 dev->vsettings.hflip = 1;
 298         else if (strncmp(buf, "0", 1) == 0)
 299                 dev->vsettings.hflip = 0;
 300         else
 301                 return -EINVAL;
 302
 303         return strlen(buf);
 304 }
 305
 306 static ssize_t show_vflip(struct device *class,
 307                 struct device_attribute *attr, char *buf)
 308 {
 309         struct video_device *vdev = to_video_device(class);
 310         struct stk_camera *dev = vdev_to_camera(vdev);
 311
 312         return sprintf(buf, "%d\n", dev->vsettings.vflip);
 313 }
 314
 315 static ssize_t store_vflip(struct device *class,
 316                 struct device_attribute *attr, const char *buf, size_t count)
 317 {
 318         struct video_device *vdev = to_video_device(class);
 319         struct stk_camera *dev = vdev_to_camera(vdev);
 320
 321         if (strncmp(buf, "1", 1) == 0)
 322                 dev->vsettings.vflip = 1;
 323         else if (strncmp(buf, "0", 1) == 0)
 324                 dev->vsettings.vflip = 0;
 325         else
 326                 return -EINVAL;
 327
 328         return strlen(buf);
 329 }
 330
 331 static DEVICE_ATTR(brightness, S_IRUGO | S_IWUGO,
 332                         show_brightness, store_brightness);
 333 static DEVICE_ATTR(hflip, S_IRUGO | S_IWUGO, show_hflip, store_hflip);
 334 static DEVICE_ATTR(vflip, S_IRUGO | S_IWUGO, show_vflip, store_vflip);
 335
 336 static int stk_create_sysfs_files(struct video_device *vdev)
 337 {
 338         int ret;
 339
 340         ret = video_device_create_file(vdev, &dev_attr_brightness);
 341         ret += video_device_create_file(vdev, &dev_attr_hflip);
 342         ret += video_device_create_file(vdev, &dev_attr_vflip);
 343         return ret;
 344 }
 345
 346 static void stk_remove_sysfs_files(struct video_device *vdev)
 347 {
 348         video_device_remove_file(vdev, &dev_attr_brightness);
 349         video_device_remove_file(vdev, &dev_attr_hflip);
 350         video_device_remove_file(vdev, &dev_attr_vflip);
 351 }
 352
 353
 354 /* *********************************************** */
 355 /*
 356  * This function is called as an URB transfert is complete (Isochronous pipe).
 357  * So, the traitement is done in interrupt time, so it has be fast, not crash,
 358  * and not stall. Neat.
 359  */
 360 static void stk_isoc_handler(struct urb *urb)
 361 {
 362         int i;
 363         int ret;
 364         int framelen;
 365         unsigned long flags;
 366
 367         unsigned char *fill = NULL;
 368         unsigned char *iso_buf = NULL;
 369
 370         struct stk_camera *dev;
 371         struct stk_sio_buffer *fb;
 372
 373         dev = (struct stk_camera *) urb->context;
 374
 375         if (dev == NULL) {
 376                 STK_ERROR("isoc_handler called with NULL device !\n");
 377                 return;
 378         }
 379
 380         if (urb->status == -ENOENT || urb->status == -ECONNRESET
 381                 || urb->status == -ESHUTDOWN) {
 382                 atomic_dec(&dev->urbs_used);
 383                 return;
 384         }
 385
 386         spin_lock_irqsave(&dev->spinlock, flags);
 387
 388         if (urb->status != -EINPROGRESS && urb->status != 0) {
 389                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
 390                 goto resubmit;
 391         }
 392
 393         if (list_empty(&dev->sio_avail)) {
 394                 /*FIXME Stop streaming after a while */
 395                 (void) (printk_ratelimit() &&
 396                 STK_ERROR("isoc_handler without available buffer!\n"));
 397                 goto resubmit;
 398         }
 399         fb = list_first_entry(&dev->sio_avail,
 400                         struct stk_sio_buffer, list);
 401         fill = fb->buffer + fb->v4lbuf.bytesused;
 402
 403         for (i = 0; i < urb->number_of_packets; i++) {
 404                 if (urb->iso_frame_desc[i].status != 0) {
 405                         if (urb->iso_frame_desc[i].status != -EXDEV)
 406                                 STK_ERROR("Frame %d has error %d\n", i,
 407                                         urb->iso_frame_desc[i].status);
 408                         continue;
 409                 }
 410                 framelen = urb->iso_frame_desc[i].actual_length;
 411                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 412
 413                 if (framelen <= 4)
 414                         continue; /* no data */
 415
 416                 /*
 417                  * we found something informational from there
 418                  * the isoc frames have to type of headers
 419                  * type1: 00 xx 00 00 or 20 xx 00 00
 420                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 421                  * xx is a sequencer which has never been seen over 0x3f
 422                  * imho data written down looks like bayer, i see similarities
 423                  * after every 640 bytes
 424                  */
 425                 if (*iso_buf & 0x80) {
 426                         framelen -= 8;
 427                         iso_buf += 8;
 428                         /* This marks a new frame */
 429                         if (fb->v4lbuf.bytesused != 0
 430                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 431                                 (void) (printk_ratelimit() &&
 432                                 STK_ERROR("frame %d, "
 433                                         "bytesused=%d, skipping\n",
 434                                         i, fb->v4lbuf.bytesused));
 435                                 fb->v4lbuf.bytesused = 0;
 436                                 fill = fb->buffer;
 437                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
 438                                 list_move_tail(dev->sio_avail.next,
 439                                         &dev->sio_full);
 440                                 wake_up(&dev->wait_frame);
 441                                 if (list_empty(&dev->sio_avail)) {
 442                                         (void) (printk_ratelimit() &&
 443                                         STK_ERROR("No buffer available\n"));
 444                                         goto resubmit;
 445                                 }
 446                                 fb = list_first_entry(&dev->sio_avail,
 447                                         struct stk_sio_buffer, list);
 448                                 fb->v4lbuf.bytesused = 0;
 449                                 fill = fb->buffer;
 450                         }
 451                 } else {
 452                         framelen -= 4;
 453                         iso_buf += 4;
 454                 }
 455
 456                 /* Our buffer is full !!! */
 457                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
 458                         (void) (printk_ratelimit() &&
 459                         STK_ERROR("Frame buffer overflow, lost sync\n"));
 460                         /*FIXME Do something here? */
 461                         continue;
 462                 }
 463                 spin_unlock_irqrestore(&dev->spinlock, flags);
 464                 memcpy(fill, iso_buf, framelen);
 465                 spin_lock_irqsave(&dev->spinlock, flags);
 466                 fill += framelen;
 467
 468                 /* New size of our buffer */
 469                 fb->v4lbuf.bytesused += framelen;
 470         }
 471
 472 resubmit:
 473         spin_unlock_irqrestore(&dev->spinlock, flags);
 474         urb->dev = dev->udev;
 475         ret = usb_submit_urb(urb, GFP_ATOMIC);
 476         if (ret != 0) {
 477                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
 478                         ret);
 479         }
 480 }
 481
 482 /* -------------------------------------------- */
 483
 484 static int stk_prepare_iso(struct stk_camera *dev)
 485 {
 486         void *kbuf;
 487         int i, j;
 488         struct urb *urb;
 489         struct usb_device *udev;
 490
 491         if (dev == NULL)
 492                 return -ENXIO;
 493         udev = dev->udev;
 494
 495         if (dev->isobufs)
 496                 STK_ERROR("isobufs already allocated. Bad\n");
 497         else
 498                 dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
 499                                         GFP_KERNEL);
 500         if (dev->isobufs == NULL) {
 501                 STK_ERROR("Unable to allocate iso buffers\n");
 502                 return -ENOMEM;
 503         }
 504         for (i = 0; i < MAX_ISO_BUFS; i++) {
 505                 if (dev->isobufs[i].data == NULL) {
 506                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 507                         if (kbuf == NULL) {
 508                                 STK_ERROR("Failed to allocate iso buffer %d\n",
 509                                         i);
 510                                 goto isobufs_out;
 511                         }
 512                         dev->isobufs[i].data = kbuf;
 513                 } else
 514                         STK_ERROR("isobuf data already allocated\n");
 515                 if (dev->isobufs[i].urb == NULL) {
 516                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 517                         if (urb == NULL) {
 518                                 STK_ERROR("Failed to allocate URB %d\n", i);
 519                                 goto isobufs_out;
 520                         }
 521                         dev->isobufs[i].urb = urb;
 522                 } else {
 523                         STK_ERROR("Killing URB\n");
 524                         usb_kill_urb(dev->isobufs[i].urb);
 525                         urb = dev->isobufs[i].urb;
 526                 }
 527                 urb->interval = 1;
 528                 urb->dev = udev;
 529                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 530                 urb->transfer_flags = URB_ISO_ASAP;
 531                 urb->transfer_buffer = dev->isobufs[i].data;
 532                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 533                 urb->complete = stk_isoc_handler;
 534                 urb->context = dev;
 535                 urb->start_frame = 0;
 536                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 537
 538                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 539                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 540                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 541                 }
 542         }
 543         set_memallocd(dev);
 544         return 0;
 545
 546 isobufs_out:
 547         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 548                 kfree(dev->isobufs[i].data);
 549         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 550                 usb_free_urb(dev->isobufs[i].urb);
 551         kfree(dev->isobufs);
 552         dev->isobufs = NULL;
 553         return -ENOMEM;
 554 }
 555
 556 static void stk_clean_iso(struct stk_camera *dev)
 557 {
 558         int i;
 559
 560         if (dev == NULL || dev->isobufs == NULL)
 561                 return;
 562
 563         for (i = 0; i < MAX_ISO_BUFS; i++) {
 564                 struct urb *urb;
 565
 566                 urb = dev->isobufs[i].urb;
 567                 if (urb) {
 568                         if (atomic_read(&dev->urbs_used))
 569                                 usb_kill_urb(urb);
 570                         usb_free_urb(urb);
 571                 }
 572                 kfree(dev->isobufs[i].data);
 573         }
 574         kfree(dev->isobufs);
 575         dev->isobufs = NULL;
 576         unset_memallocd(dev);
 577 }
 578
 579 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 580 {
 581         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 582         INIT_LIST_HEAD(&buf->list);
 583         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 584         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 585         if (buf->buffer == NULL)
 586                 return -ENOMEM;
 587         buf->mapcount = 0;
 588         buf->dev = dev;
 589         buf->v4lbuf.index = index;
 590         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 591         buf->v4lbuf.field = V4L2_FIELD_NONE;
 592         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 593         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 594         return 0;
 595 }
 596
 597 static int stk_free_sio_buffers(struct stk_camera *dev)
 598 {
 599         int i;
 600         int nbufs;
 601         unsigned long flags;
 602         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 603                 return 0;
 604         /*
 605         * If any buffers are mapped, we cannot free them at all.
 606         */
 607         for (i = 0; i < dev->n_sbufs; i++) {
 608                 if (dev->sio_bufs[i].mapcount > 0)
 609                         return -EBUSY;
 610         }
 611         /*
 612         * OK, let's do it.
 613         */
 614         spin_lock_irqsave(&dev->spinlock, flags);
 615         INIT_LIST_HEAD(&dev->sio_avail);
 616         INIT_LIST_HEAD(&dev->sio_full);
 617         nbufs = dev->n_sbufs;
 618         dev->n_sbufs = 0;
 619         spin_unlock_irqrestore(&dev->spinlock, flags);
 620         for (i = 0; i < nbufs; i++) {
 621                 if (dev->sio_bufs[i].buffer != NULL)
 622                         vfree(dev->sio_bufs[i].buffer);
 623         }
 624         kfree(dev->sio_bufs);
 625         dev->sio_bufs = NULL;
 626         return 0;
 627 }
 628
 629 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 630 {
 631         int i;
 632         if (dev->sio_bufs != NULL)
 633                 STK_ERROR("sio_bufs already allocated\n");
 634         else {
 635                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
 636                                 GFP_KERNEL);
 637                 if (dev->sio_bufs == NULL)
 638                         return -ENOMEM;
 639                 for (i = 0; i < n_sbufs; i++) {
 640                         if (stk_setup_siobuf(dev, i))
 641                                 return (dev->n_sbufs > 1)? 0 : -ENOMEM;
 642                         dev->n_sbufs = i+1;
 643                 }
 644         }
 645         return 0;
 646 }
 647
 648 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 649 {
 650         int err;
 651         err = stk_prepare_iso(dev);
 652         if (err) {
 653                 stk_clean_iso(dev);
 654                 return err;
 655         }
 656         err = stk_prepare_sio_buffers(dev, n_sbufs);
 657         if (err) {
 658                 stk_free_sio_buffers(dev);
 659                 return err;
 660         }
 661         return 0;
 662 }
 663
 664 static void stk_free_buffers(struct stk_camera *dev)
 665 {
 666         stk_clean_iso(dev);
 667         stk_free_sio_buffers(dev);
 668 }
 669 /* -------------------------------------------- */
 670
 671 /* v4l file operations */
 672
 673 static int v4l_stk_open(struct inode *inode, struct file *fp)
 674 {
 675         struct stk_camera *dev;
 676         struct video_device *vdev;
 677
 678         vdev = video_devdata(fp);
 679         dev = vdev_to_camera(vdev);
 680
 681         if (dev == NULL || !is_present(dev))
 682                 return -ENXIO;
 683         fp->private_data = vdev;
 684         kref_get(&dev->kref);
 685         usb_autopm_get_interface(dev->interface);
 686
 687         return 0;
 688 }
 689
 690 static int v4l_stk_release(struct inode *inode, struct file *fp)
 691 {
 692         struct stk_camera *dev;
 693         struct video_device *vdev;
 694
 695         vdev = video_devdata(fp);
 696         if (vdev == NULL) {
 697                 STK_ERROR("v4l_release called w/o video devdata\n");
 698                 return -EFAULT;
 699         }
 700         dev = vdev_to_camera(vdev);
 701         if (dev == NULL) {
 702                 STK_ERROR("v4l_release called on removed device\n");
 703                 return -ENODEV;
 704         }
 705
 706         if (dev->owner != fp) {
 707                 usb_autopm_put_interface(dev->interface);
 708                 kref_put(&dev->kref, stk_camera_cleanup);
 709                 return 0;
 710         }
 711
 712         stk_stop_stream(dev);
 713
 714         stk_free_buffers(dev);
 715
 716         dev->owner = NULL;
 717
 718         usb_autopm_put_interface(dev->interface);
 719         kref_put(&dev->kref, stk_camera_cleanup);
 720
 721         return 0;
 722 }
 723
 724 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 725                 size_t count, loff_t *f_pos)
 726 {
 727         int i;
 728         int ret;
 729         unsigned long flags;
 730         struct stk_camera *dev;
 731         struct video_device *vdev;
 732         struct stk_sio_buffer *sbuf;
 733
 734         vdev = video_devdata(fp);
 735         if (vdev == NULL)
 736                 return -EFAULT;
 737         dev = vdev_to_camera(vdev);
 738
 739         if (dev == NULL)
 740                 return -EIO;
 741
 742         if (!is_present(dev))
 743                 return -EIO;
 744         if (dev->owner && dev->owner != fp)
 745                 return -EBUSY;
 746         dev->owner = fp;
 747         if (!is_streaming(dev)) {
 748                 if (stk_initialise(dev)
 749                         || stk_allocate_buffers(dev, 3)
 750                         || stk_start_stream(dev))
 751                         return -ENOMEM;
 752                 spin_lock_irqsave(&dev->spinlock, flags);
 753                 for (i = 0; i < dev->n_sbufs; i++) {
 754                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 755                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 756                 }
 757                 spin_unlock_irqrestore(&dev->spinlock, flags);
 758         }
 759         if (*f_pos == 0) {
 760                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 761                         return -EWOULDBLOCK;
 762                 ret = wait_event_interruptible(dev->wait_frame,
 763                         !list_empty(&dev->sio_full) || !is_present(dev));
 764                 if (ret)
 765                         return ret;
 766                 if (!is_present(dev))
 767                         return -EIO;
 768         }
 769         if (count + *f_pos > dev->frame_size)
 770                 count = dev->frame_size - *f_pos;
 771         spin_lock_irqsave(&dev->spinlock, flags);
 772         if (list_empty(&dev->sio_full)) {
 773                 spin_unlock_irqrestore(&dev->spinlock, flags);
 774                 STK_ERROR("BUG: No siobufs ready\n");
 775                 return 0;
 776         }
 777         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 778         spin_unlock_irqrestore(&dev->spinlock, flags);
 779
 780         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 781                 return -EFAULT;
 782
 783         *f_pos += count;
 784
 785         if (*f_pos >= dev->frame_size) {
 786                 *f_pos = 0;
 787                 spin_lock_irqsave(&dev->spinlock, flags);
 788                 list_move_tail(&sbuf->list, &dev->sio_avail);
 789                 spin_unlock_irqrestore(&dev->spinlock, flags);
 790         }
 791         return count;
 792 }
 793
 794 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
 795 {
 796         struct stk_camera *dev;
 797         struct video_device *vdev;
 798
 799         vdev = video_devdata(fp);
 800
 801         if (vdev == NULL)
 802                 return -EFAULT;
 803
 804         dev = vdev_to_camera(vdev);
 805         if (dev == NULL)
 806                 return -ENODEV;
 807
 808         poll_wait(fp, &dev->wait_frame, wait);
 809
 810         if (!is_present(dev))
 811                 return POLLERR;
 812
 813         if (!list_empty(&dev->sio_full))
 814                 return (POLLIN | POLLRDNORM);
 815
 816         return 0;
 817 }
 818
 819
 820 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 821 {
 822         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 823         sbuf->mapcount++;
 824 }
 825 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 826 {
 827         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 828         sbuf->mapcount--;
 829         if (sbuf->mapcount == 0)
 830                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 831 }
 832 static struct vm_operations_struct stk_v4l_vm_ops = {
 833         .open = stk_v4l_vm_open,
 834         .close = stk_v4l_vm_close
 835 };
 836
 837 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 838 {
 839         unsigned int i;
 840         int ret;
 841         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 842         struct stk_camera *dev;
 843         struct video_device *vdev;
 844         struct stk_sio_buffer *sbuf = NULL;
 845
 846         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 847                 return -EINVAL;
 848
 849         vdev = video_devdata(fp);
 850         dev = vdev_to_camera(vdev);
 851
 852         for (i = 0; i < dev->n_sbufs; i++) {
 853                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 854                         sbuf = dev->sio_bufs + i;
 855                         break;
 856                 }
 857         }
 858         if (sbuf == NULL)
 859                 return -EINVAL;
 860         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 861         if (ret)
 862                 return ret;
 863         vma->vm_flags |= VM_DONTEXPAND;
 864         vma->vm_private_data = sbuf;
 865         vma->vm_ops = &stk_v4l_vm_ops;
 866         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 867         stk_v4l_vm_open(vma);
 868         return 0;
 869 }
 870
 871 /* v4l ioctl handlers */
 872
 873 static int stk_vidioc_querycap(struct file *filp,
 874                 void *priv, struct v4l2_capability *cap)
 875 {
 876         strcpy(cap->driver, "stk");
 877         strcpy(cap->card, "stk");
 878         cap->version = DRIVER_VERSION_NUM;
 879
 880         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 881                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 882         return 0;
 883 }
 884
 885 static int stk_vidioc_enum_input(struct file *filp,
 886                 void *priv, struct v4l2_input *input)
 887 {
 888         if (input->index != 0)
 889                 return -EINVAL;
 890
 891         strcpy(input->name, "Syntek USB Camera");
 892         input->type = V4L2_INPUT_TYPE_CAMERA;
 893         return 0;
 894 }
 895
 896
 897 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 898 {
 899         *i = 0;
 900         return 0;
 901 }
 902
 903 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 904 {
 905         if (i != 0)
 906                 return -EINVAL;
 907         else
 908                 return 0;
 909 }
 910
 911 /* from vivi.c */
 912 static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
 913 {
 914         return 0;
 915 }
 916
 917 /* List of all V4Lv2 controls supported by the driver */
 918 static struct v4l2_queryctrl stk_controls[] = {
 919         {
 920                 .id      = V4L2_CID_BRIGHTNESS,
 921                 .type    = V4L2_CTRL_TYPE_INTEGER,
 922                 .name    = "Brightness",
 923                 .minimum = 0,
 924                 .maximum = 0xffff,
 925                 .step    = 0x0100,
 926                 .default_value = 0x6000,
 927         },
 928         /*TODO: get more controls to work */
 929 };
 930
 931 static int stk_vidioc_queryctrl(struct file *filp,
 932                 void *priv, struct v4l2_queryctrl *c)
 933 {
 934         int i;
 935         int nbr;
 936         nbr = ARRAY_SIZE(stk_controls);
 937
 938         for (i = 0; i < nbr; i++) {
 939                 if (stk_controls[i].id == c->id) {
 940                         memcpy(c, &stk_controls[i],
 941                                 sizeof(struct v4l2_queryctrl));
 942                         return 0;
 943                 }
 944         }
 945         return -EINVAL;
 946 }
 947
 948 static int stk_vidioc_g_ctrl(struct file *filp,
 949                 void *priv, struct v4l2_control *c)
 950 {
 951         struct stk_camera *dev = priv;
 952         switch (c->id) {
 953         case V4L2_CID_BRIGHTNESS:
 954                 c->value = dev->vsettings.brightness;
 955                 break;
 956         default:
 957                 return -EINVAL;
 958         }
 959         return 0;
 960 }
 961
 962 static int stk_vidioc_s_ctrl(struct file *filp,
 963                 void *priv, struct v4l2_control *c)
 964 {
 965         struct stk_camera *dev = priv;
 966         switch (c->id) {
 967         case V4L2_CID_BRIGHTNESS:
 968                 dev->vsettings.brightness = c->value;
 969                 return stk_sensor_set_brightness(dev, c->value >> 8);
 970         default:
 971                 return -EINVAL;
 972         }
 973         return 0;
 974 }
 975
 976
 977 static int stk_vidioc_enum_fmt_cap(struct file *filp,
 978                 void *priv, struct v4l2_fmtdesc *fmtd)
 979 {
 980         fmtd->flags = 0;
 981
 982         switch (fmtd->index) {
 983         case 0:
 984                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 985                 strcpy(fmtd->description, "r5g6b5");
 986                 break;
 987         case 1:
 988                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 989                 strcpy(fmtd->description, "r5g6b5BE");
 990                 break;
 991         case 2:
 992                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 993                 strcpy(fmtd->description, "yuv4:2:2");
 994                 break;
 995         case 3:
 996                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 997                 strcpy(fmtd->description, "Raw bayer");
 998                 break;
 999         case 4:
1000                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1001                 strcpy(fmtd->description, "yuv4:2:2");
1002                 break;
1003         default:
1004                 return -EINVAL;
1005         }
1006         return 0;
1007 }
1008
1009 static struct stk_size {
1010         unsigned w;
1011         unsigned h;
1012         enum stk_mode m;
1013 } stk_sizes[] = {
1014         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
1015         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
1016         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
1017         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
1018         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
1019 };
1020
1021 static int stk_vidioc_g_fmt_cap(struct file *filp,
1022                 void *priv, struct v4l2_format *f)
1023 {
1024         struct v4l2_pix_format *pix_format = &f->fmt.pix;
1025         struct stk_camera *dev = priv;
1026         int i;
1027
1028         for (i = 0; i < ARRAY_SIZE(stk_sizes)
1029                         && stk_sizes[i].m != dev->vsettings.mode;
1030                 i++);
1031         if (i == ARRAY_SIZE(stk_sizes)) {
1032                 STK_ERROR("ERROR: mode invalid\n");
1033                 return -EINVAL;
1034         }
1035         pix_format->width = stk_sizes[i].w;
1036         pix_format->height = stk_sizes[i].h;
1037         pix_format->field = V4L2_FIELD_NONE;
1038         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
1039         pix_format->priv = 0;
1040         pix_format->pixelformat = dev->vsettings.palette;
1041         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
1042                 pix_format->bytesperline = pix_format->width;
1043         else
1044                 pix_format->bytesperline = 2 * pix_format->width;
1045         pix_format->sizeimage = pix_format->bytesperline
1046                                 * pix_format->height;
1047         return 0;
1048 }
1049
1050 static int stk_vidioc_try_fmt_cap(struct file *filp,
1051                 void *priv, struct v4l2_format *fmtd)
1052 {
1053         int i;
1054         switch (fmtd->fmt.pix.pixelformat) {
1055         case V4L2_PIX_FMT_RGB565:
1056         case V4L2_PIX_FMT_RGB565X:
1057         case V4L2_PIX_FMT_UYVY:
1058         case V4L2_PIX_FMT_YUYV:
1059         case V4L2_PIX_FMT_SBGGR8:
1060                 break;
1061         default:
1062                 return -EINVAL;
1063         }
1064         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
1065                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
1066                         break;
1067         }
1068         if (i == ARRAY_SIZE(stk_sizes)
1069                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
1070                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
1071                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
1072                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
1073                 fmtd->fmt.pix.priv = i - 1;
1074         } else {
1075                 fmtd->fmt.pix.height = stk_sizes[i].h;
1076                 fmtd->fmt.pix.width = stk_sizes[i].w;
1077                 fmtd->fmt.pix.priv = i;
1078         }
1079
1080         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
1081         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
1082         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
1083                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
1084         else
1085                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
1086         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
1087                 * fmtd->fmt.pix.height;
1088         return 0;
1089 }
1090
1091 static int stk_setup_format(struct stk_camera *dev)
1092 {
1093         int i = 0;
1094         int depth;
1095         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
1096                 depth = 1;
1097         else
1098                 depth = 2;
1099         while (stk_sizes[i].m != dev->vsettings.mode
1100                         && i < ARRAY_SIZE(stk_sizes))
1101                 i++;
1102         if (i == ARRAY_SIZE(stk_sizes)) {
1103                 STK_ERROR("Something is broken in %s\n", __FUNCTION__);
1104                 return -EFAULT;
1105         }
1106         /* This registers controls some timings, not sure of what. */
1107         stk_camera_write_reg(dev, 0x001b, 0x0e);
1108         if (dev->vsettings.mode == MODE_SXGA)
1109                 stk_camera_write_reg(dev, 0x001c, 0x0e);
1110         else
1111                 stk_camera_write_reg(dev, 0x001c, 0x46);
1112         /*
1113          * Registers 0x0115 0x0114 are the size of each line (bytes),
1114          * regs 0x0117 0x0116 are the heigth of the image.
1115          */
1116         stk_camera_write_reg(dev, 0x0115,
1117                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
1118         stk_camera_write_reg(dev, 0x0114,
1119                 (stk_sizes[i].w * depth) & 0xff);
1120         stk_camera_write_reg(dev, 0x0117,
1121                 (stk_sizes[i].h >> 8) & 0xff);
1122         stk_camera_write_reg(dev, 0x0116,
1123                 stk_sizes[i].h & 0xff);
1124         return stk_sensor_configure(dev);
1125 }
1126
1127 static int stk_vidioc_s_fmt_cap(struct file *filp,
1128                 void *priv, struct v4l2_format *fmtd)
1129 {
1130         int ret;
1131         struct stk_camera *dev = priv;
1132
1133         if (dev == NULL)
1134                 return -ENODEV;
1135         if (!is_present(dev))
1136                 return -ENODEV;
1137         if (is_streaming(dev))
1138                 return -EBUSY;
1139         if (dev->owner && dev->owner != filp)
1140                 return -EBUSY;
1141         ret = stk_vidioc_try_fmt_cap(filp, priv, fmtd);
1142         if (ret)
1143                 return ret;
1144         dev->owner = filp;
1145
1146         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1147         stk_free_buffers(dev);
1148         dev->frame_size = fmtd->fmt.pix.sizeimage;
1149         dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
1150
1151         stk_initialise(dev);
1152         return stk_setup_format(dev);
1153 }
1154
1155 static int stk_vidioc_reqbufs(struct file *filp,
1156                 void *priv, struct v4l2_requestbuffers *rb)
1157 {
1158         struct stk_camera *dev = priv;
1159
1160         if (dev == NULL)
1161                 return -ENODEV;
1162         if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1163                 return -EINVAL;
1164         if (rb->memory != V4L2_MEMORY_MMAP)
1165                 return -EINVAL;
1166         if (is_streaming(dev)
1167                 || (dev->owner && dev->owner != filp))
1168                 return -EBUSY;
1169         dev->owner = filp;
1170
1171         /*FIXME If they ask for zero, we must stop streaming and free */
1172         if (rb->count < 3)
1173                 rb->count = 3;
1174         /* Arbitrary limit */
1175         else if (rb->count > 5)
1176                 rb->count = 5;
1177
1178         stk_allocate_buffers(dev, rb->count);
1179         rb->count = dev->n_sbufs;
1180         return 0;
1181 }
1182
1183 static int stk_vidioc_querybuf(struct file *filp,
1184                 void *priv, struct v4l2_buffer *buf)
1185 {
1186         int index;
1187         struct stk_camera *dev = priv;
1188         struct stk_sio_buffer *sbuf;
1189
1190         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1191                 return -EINVAL;
1192
1193         index = buf->index;
1194
1195         if (index < 0 || index >= dev->n_sbufs)
1196                 return -EINVAL;
1197         sbuf = dev->sio_bufs + buf->index;
1198         *buf = sbuf->v4lbuf;
1199         return 0;
1200 }
1201
1202 static int stk_vidioc_qbuf(struct file *filp,
1203                 void *priv, struct v4l2_buffer *buf)
1204 {
1205         struct stk_camera *dev = priv;
1206         struct stk_sio_buffer *sbuf;
1207         unsigned long flags;
1208         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1209                 return -EINVAL;
1210
1211         if (buf->memory != V4L2_MEMORY_MMAP)
1212                 return -EINVAL;
1213
1214         if (buf->index < 0 || buf->index >= dev->n_sbufs)
1215                 return -EINVAL;
1216         sbuf = dev->sio_bufs + buf->index;
1217         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1218                 return 0;
1219         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1220         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1221         spin_lock_irqsave(&dev->spinlock, flags);
1222         list_add_tail(&sbuf->list, &dev->sio_avail);
1223         *buf = sbuf->v4lbuf;
1224         spin_unlock_irqrestore(&dev->spinlock, flags);
1225         return 0;
1226 }
1227
1228 static int stk_vidioc_dqbuf(struct file *filp,
1229                 void *priv, struct v4l2_buffer *buf)
1230 {
1231         struct stk_camera *dev = priv;
1232         struct stk_sio_buffer *sbuf;
1233         unsigned long flags;
1234         int ret;
1235
1236         if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
1237                 || !is_streaming(dev))
1238                 return -EINVAL;
1239
1240         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1241                 return -EWOULDBLOCK;
1242         ret = wait_event_interruptible(dev->wait_frame,
1243                 !list_empty(&dev->sio_full) || !is_present(dev));
1244         if (ret)
1245                 return ret;
1246         if (!is_present(dev))
1247                 return -EIO;
1248
1249         spin_lock_irqsave(&dev->spinlock, flags);
1250         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1251         list_del_init(&sbuf->list);
1252         spin_unlock_irqrestore(&dev->spinlock, flags);
1253         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1254         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1255         sbuf->v4lbuf.sequence = ++dev->sequence;
1256         do_gettimeofday(&sbuf->v4lbuf.timestamp);
1257
1258         *buf = sbuf->v4lbuf;
1259         return 0;
1260 }
1261
1262 static int stk_vidioc_streamon(struct file *filp,
1263                 void *priv, enum v4l2_buf_type type)
1264 {
1265         struct stk_camera *dev = priv;
1266         if (is_streaming(dev))
1267                 return 0;
1268         if (dev->sio_bufs == NULL)
1269                 return -EINVAL;
1270         dev->sequence = 0;
1271         return stk_start_stream(dev);
1272 }
1273
1274 static int stk_vidioc_streamoff(struct file *filp,
1275                 void *priv, enum v4l2_buf_type type)
1276 {
1277         struct stk_camera *dev = priv;
1278         unsigned long flags;
1279         int i;
1280         stk_stop_stream(dev);
1281         spin_lock_irqsave(&dev->spinlock, flags);
1282         INIT_LIST_HEAD(&dev->sio_avail);
1283         INIT_LIST_HEAD(&dev->sio_full);
1284         for (i = 0; i < dev->n_sbufs; i++) {
1285                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1286                 dev->sio_bufs[i].v4lbuf.flags = 0;
1287         }
1288         spin_unlock_irqrestore(&dev->spinlock, flags);
1289         return 0;
1290 }
1291
1292
1293 static int stk_vidioc_g_parm(struct file *filp,
1294                 void *priv, struct v4l2_streamparm *sp)
1295 {
1296         if (sp->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1297                 return -EINVAL;
1298
1299         sp->parm.capture.capability = 0;
1300         sp->parm.capture.capturemode = 0;
1301         /*FIXME This is not correct */
1302         sp->parm.capture.timeperframe.numerator = 1;
1303         sp->parm.capture.timeperframe.denominator = 30;
1304         sp->parm.capture.readbuffers = 2;
1305         sp->parm.capture.extendedmode = 0;
1306         return 0;
1307 }
1308
1309 static struct file_operations v4l_stk_fops = {
1310         .owner = THIS_MODULE,
1311         .open = v4l_stk_open,
1312         .release = v4l_stk_release,
1313         .read = v4l_stk_read,
1314         .poll = v4l_stk_poll,
1315         .mmap = v4l_stk_mmap,
1316         .ioctl = video_ioctl2,
1317 #ifdef CONFIG_COMPAT
1318         .compat_ioctl = v4l_compat_ioctl32,
1319 #endif
1320         .llseek = no_llseek
1321 };
1322
1323 static void stk_v4l_dev_release(struct video_device *vd)
1324 {
1325 }
1326
1327 static struct video_device stk_v4l_data = {
1328         .name = "stkwebcam",
1329         .type = VFL_TYPE_GRABBER,
1330         .type2 = VID_TYPE_CAPTURE,
1331         .minor = -1,
1332         .tvnorms = V4L2_STD_UNKNOWN,
1333         .current_norm = V4L2_STD_UNKNOWN,
1334         .fops = &v4l_stk_fops,
1335         .release = stk_v4l_dev_release,
1336
1337         .vidioc_querycap = stk_vidioc_querycap,
1338         .vidioc_enum_fmt_cap = stk_vidioc_enum_fmt_cap,
1339         .vidioc_try_fmt_cap = stk_vidioc_try_fmt_cap,
1340         .vidioc_s_fmt_cap = stk_vidioc_s_fmt_cap,
1341         .vidioc_g_fmt_cap = stk_vidioc_g_fmt_cap,
1342         .vidioc_enum_input = stk_vidioc_enum_input,
1343         .vidioc_s_input = stk_vidioc_s_input,
1344         .vidioc_g_input = stk_vidioc_g_input,
1345         .vidioc_s_std = stk_vidioc_s_std,
1346         .vidioc_reqbufs = stk_vidioc_reqbufs,
1347         .vidioc_querybuf = stk_vidioc_querybuf,
1348         .vidioc_qbuf = stk_vidioc_qbuf,
1349         .vidioc_dqbuf = stk_vidioc_dqbuf,
1350         .vidioc_streamon = stk_vidioc_streamon,
1351         .vidioc_streamoff = stk_vidioc_streamoff,
1352         .vidioc_queryctrl = stk_vidioc_queryctrl,
1353         .vidioc_g_ctrl = stk_vidioc_g_ctrl,
1354         .vidioc_s_ctrl = stk_vidioc_s_ctrl,
1355         .vidioc_g_parm = stk_vidioc_g_parm,
1356 };
1357
1358
1359 static int stk_register_video_device(struct stk_camera *dev)
1360 {
1361         int err;
1362
1363         dev->vdev = stk_v4l_data;
1364         dev->vdev.debug = debug;
1365         dev->vdev.dev = &dev->interface->dev;
1366         dev->vdev.priv = dev;
1367         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1368         if (err)
1369                 STK_ERROR("v4l registration failed\n");
1370         else
1371                 STK_INFO("Syntek USB2.0 Camera is now controlling video device"
1372                         " /dev/video%d\n", dev->vdev.minor);
1373         return err;
1374 }
1375
1376
1377 /* USB Stuff */
1378
1379 static int stk_camera_probe(struct usb_interface *interface,
1380                 const struct usb_device_id *id)
1381 {
1382         int i;
1383         int err;
1384
1385         struct stk_camera *dev = NULL;
1386         struct usb_device *udev = interface_to_usbdev(interface);
1387         struct usb_host_interface *iface_desc;
1388         struct usb_endpoint_descriptor *endpoint;
1389
1390         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1391         if (dev == NULL) {
1392                 STK_ERROR("Out of memory !\n");
1393                 return -ENOMEM;
1394         }
1395
1396         kref_init(&dev->kref);
1397         spin_lock_init(&dev->spinlock);
1398         init_waitqueue_head(&dev->wait_frame);
1399
1400         dev->udev = udev;
1401         dev->interface = interface;
1402         usb_get_intf(interface);
1403
1404         dev->vsettings.vflip = vflip;
1405         dev->vsettings.hflip = hflip;
1406         dev->n_sbufs = 0;
1407         set_present(dev);
1408
1409         /* Set up the endpoint information
1410          * use only the first isoc-in endpoint
1411          * for the current alternate setting */
1412         iface_desc = interface->cur_altsetting;
1413
1414         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1415                 endpoint = &iface_desc->endpoint[i].desc;
1416
1417                 if (!dev->isoc_ep
1418                         && ((endpoint->bEndpointAddress
1419                                 & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1420                         && ((endpoint->bmAttributes
1421                                 & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC)) {
1422                         /* we found an isoc in endpoint */
1423                         dev->isoc_ep = (endpoint->bEndpointAddress & 0xF);
1424                         break;
1425                 }
1426         }
1427         if (!dev->isoc_ep) {
1428                 STK_ERROR("Could not find isoc-in endpoint");
1429                 kref_put(&dev->kref, stk_camera_cleanup);
1430                 return -ENODEV;
1431         }
1432         dev->vsettings.brightness = 0x7fff;
1433         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1434         dev->vsettings.mode = MODE_VGA;
1435         dev->frame_size = 640 * 480 * 2;
1436
1437         INIT_LIST_HEAD(&dev->sio_avail);
1438         INIT_LIST_HEAD(&dev->sio_full);
1439
1440         usb_set_intfdata(interface, dev);
1441
1442         err = stk_register_video_device(dev);
1443         if (err) {
1444                 kref_put(&dev->kref, stk_camera_cleanup);
1445                 return err;
1446         }
1447
1448         stk_create_sysfs_files(&dev->vdev);
1449         usb_autopm_enable(dev->interface);
1450
1451         return 0;
1452 }
1453
1454 static void stk_camera_disconnect(struct usb_interface *interface)
1455 {
1456         struct stk_camera *dev = usb_get_intfdata(interface);
1457
1458         usb_set_intfdata(interface, NULL);
1459         unset_present(dev);
1460
1461         wake_up_interruptible(&dev->wait_frame);
1462         stk_remove_sysfs_files(&dev->vdev);
1463
1464         kref_put(&dev->kref, stk_camera_cleanup);
1465 }
1466
1467 #ifdef CONFIG_PM
1468 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1469 {
1470         struct stk_camera *dev = usb_get_intfdata(intf);
1471         if (is_streaming(dev)) {
1472                 stk_stop_stream(dev);
1473                 /* yes, this is ugly */
1474                 set_streaming(dev);
1475         }
1476         return 0;
1477 }
1478
1479 static int stk_camera_resume(struct usb_interface *intf)
1480 {
1481         struct stk_camera *dev = usb_get_intfdata(intf);
1482         if (!is_initialised(dev))
1483                 return 0;
1484         unset_initialised(dev);
1485         stk_initialise(dev);
1486         stk_setup_format(dev);
1487         if (is_streaming(dev))
1488                 stk_start_stream(dev);
1489         return 0;
1490 }
1491 #endif
1492
1493 static struct usb_driver stk_camera_driver = {
1494         .name = "stkwebcam",
1495         .probe = stk_camera_probe,
1496         .disconnect = stk_camera_disconnect,
1497         .id_table = stkwebcam_table,
1498 #ifdef CONFIG_PM
1499         .suspend = stk_camera_suspend,
1500         .resume = stk_camera_resume,
1501 #endif
1502 };
1503
1504
1505 static int __init stk_camera_init(void)
1506 {
1507         int result;
1508
1509         result = usb_register(&stk_camera_driver);
1510         if (result)
1511                 STK_ERROR("usb_register failed ! Error number %d\n", result);
1512
1513
1514         return result;
1515 }
1516
1517 static void __exit stk_camera_exit(void)
1518 {
1519         usb_deregister(&stk_camera_driver);
1520 }
1521
1522 module_init(stk_camera_init);
1523 module_exit(stk_camera_exit);
1524
1525