drivers/media/video/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/usb.h>
  32 #include <linux/mm.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/videodev2.h>
  35 #include <media/v4l2-common.h>
  36 #include <media/v4l2-ioctl.h>
  37
  38 #include "stk-webcam.h"
  39
  40
  41 static int hflip = 1;
  42 module_param(hflip, bool, 0444);
  43 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");
  44
  45 static int vflip = 1;
  46 module_param(vflip, bool, 0444);
  47 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");
  48
  49 static int debug;
  50 module_param(debug, int, 0444);
  51 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
  52
  53 MODULE_LICENSE("GPL");
  54 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
  55 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
  56
  57
  58
  59 /* Some cameras have audio interfaces, we aren't interested in those */
  60 static struct usb_device_id stkwebcam_table[] = {
  61         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
  62         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
  63         { }
  64 };
  65 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
  66
  67 /*
  68  * Basic stuff
  69  */
  70 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
  71 {
  72         struct usb_device *udev = dev->udev;
  73         int ret;
  74
  75         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  76                         0x01,
  77                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  78                         value,
  79                         index,
  80                         NULL,
  81                         0,
  82                         500);
  83         if (ret < 0)
  84                 return ret;
  85         else
  86                 return 0;
  87 }
  88
  89 int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
  90 {
  91         struct usb_device *udev = dev->udev;
  92         int ret;
  93
  94         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  95                         0x00,
  96                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  97                         0x00,
  98                         index,
  99                         (u8 *) value,
 100                         sizeof(u8),
 101                         500);
 102         if (ret < 0)
 103                 return ret;
 104         else
 105                 return 0;
 106 }
 107
 108 static int stk_start_stream(struct stk_camera *dev)
 109 {
 110         int value;
 111         int i, ret;
 112         int value_116, value_117;
 113
 114         if (!is_present(dev))
 115                 return -ENODEV;
 116         if (!is_memallocd(dev) || !is_initialised(dev)) {
 117                 STK_ERROR("FIXME: Buffers are not allocated\n");
 118                 return -EFAULT;
 119         }
 120         ret = usb_set_interface(dev->udev, 0, 5);
 121
 122         if (ret < 0)
 123                 STK_ERROR("usb_set_interface failed !\n");
 124         if (stk_sensor_wakeup(dev))
 125                 STK_ERROR("error awaking the sensor\n");
 126
 127         stk_camera_read_reg(dev, 0x0116, &value_116);
 128         stk_camera_read_reg(dev, 0x0117, &value_117);
 129
 130         stk_camera_write_reg(dev, 0x0116, 0x0000);
 131         stk_camera_write_reg(dev, 0x0117, 0x0000);
 132
 133         stk_camera_read_reg(dev, 0x0100, &value);
 134         stk_camera_write_reg(dev, 0x0100, value | 0x80);
 135
 136         stk_camera_write_reg(dev, 0x0116, value_116);
 137         stk_camera_write_reg(dev, 0x0117, value_117);
 138         for (i = 0; i < MAX_ISO_BUFS; i++) {
 139                 if (dev->isobufs[i].urb) {
 140                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
 141                         atomic_inc(&dev->urbs_used);
 142                         if (ret)
 143                                 return ret;
 144                 }
 145         }
 146         set_streaming(dev);
 147         return 0;
 148 }
 149
 150 static int stk_stop_stream(struct stk_camera *dev)
 151 {
 152         int value;
 153         int i;
 154         if (is_present(dev)) {
 155                 stk_camera_read_reg(dev, 0x0100, &value);
 156                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
 157                 if (dev->isobufs != NULL) {
 158                         for (i = 0; i < MAX_ISO_BUFS; i++) {
 159                                 if (dev->isobufs[i].urb)
 160                                         usb_kill_urb(dev->isobufs[i].urb);
 161                         }
 162                 }
 163                 unset_streaming(dev);
 164
 165                 if (usb_set_interface(dev->udev, 0, 0))
 166                         STK_ERROR("usb_set_interface failed !\n");
 167                 if (stk_sensor_sleep(dev))
 168                         STK_ERROR("error suspending the sensor\n");
 169         }
 170         return 0;
 171 }
 172
 173 /*
 174  * This seems to be the shortest init sequence we
 175  * must do in order to find the sensor
 176  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 177  * is also reset. Maybe powers down it?
 178  * Rest of values don't make a difference
 179  */
 180
 181 static struct regval stk1125_initvals[] = {
 182         /*TODO: What means this sequence? */
 183         {0x0000, 0x24},
 184         {0x0100, 0x21},
 185         {0x0002, 0x68},
 186         {0x0003, 0x80},
 187         {0x0005, 0x00},
 188         {0x0007, 0x03},
 189         {0x000d, 0x00},
 190         {0x000f, 0x02},
 191         {0x0300, 0x12},
 192         {0x0350, 0x41},
 193         {0x0351, 0x00},
 194         {0x0352, 0x00},
 195         {0x0353, 0x00},
 196         {0x0018, 0x10},
 197         {0x0019, 0x00},
 198         {0x001b, 0x0e},
 199         {0x001c, 0x46},
 200         {0x0300, 0x80},
 201         {0x001a, 0x04},
 202         {0x0110, 0x00},
 203         {0x0111, 0x00},
 204         {0x0112, 0x00},
 205         {0x0113, 0x00},
 206
 207         {0xffff, 0xff},
 208 };
 209
 210
 211 static int stk_initialise(struct stk_camera *dev)
 212 {
 213         struct regval *rv;
 214         int ret;
 215         if (!is_present(dev))
 216                 return -ENODEV;
 217         if (is_initialised(dev))
 218                 return 0;
 219         rv = stk1125_initvals;
 220         while (rv->reg != 0xffff) {
 221                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
 222                 if (ret)
 223                         return ret;
 224                 rv++;
 225         }
 226         if (stk_sensor_init(dev) == 0) {
 227                 set_initialised(dev);
 228                 return 0;
 229         } else
 230                 return -1;
 231 }
 232
 233 /* *********************************************** */
 234 /*
 235  * This function is called as an URB transfert is complete (Isochronous pipe).
 236  * So, the traitement is done in interrupt time, so it has be fast, not crash,
 237  * and not stall. Neat.
 238  */
 239 static void stk_isoc_handler(struct urb *urb)
 240 {
 241         int i;
 242         int ret;
 243         int framelen;
 244         unsigned long flags;
 245
 246         unsigned char *fill = NULL;
 247         unsigned char *iso_buf = NULL;
 248
 249         struct stk_camera *dev;
 250         struct stk_sio_buffer *fb;
 251
 252         dev = (struct stk_camera *) urb->context;
 253
 254         if (dev == NULL) {
 255                 STK_ERROR("isoc_handler called with NULL device !\n");
 256                 return;
 257         }
 258
 259         if (urb->status == -ENOENT || urb->status == -ECONNRESET
 260                 || urb->status == -ESHUTDOWN) {
 261                 atomic_dec(&dev->urbs_used);
 262                 return;
 263         }
 264
 265         spin_lock_irqsave(&dev->spinlock, flags);
 266
 267         if (urb->status != -EINPROGRESS && urb->status != 0) {
 268                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
 269                 goto resubmit;
 270         }
 271
 272         if (list_empty(&dev->sio_avail)) {
 273                 /*FIXME Stop streaming after a while */
 274                 (void) (printk_ratelimit() &&
 275                 STK_ERROR("isoc_handler without available buffer!\n"));
 276                 goto resubmit;
 277         }
 278         fb = list_first_entry(&dev->sio_avail,
 279                         struct stk_sio_buffer, list);
 280         fill = fb->buffer + fb->v4lbuf.bytesused;
 281
 282         for (i = 0; i < urb->number_of_packets; i++) {
 283                 if (urb->iso_frame_desc[i].status != 0) {
 284                         if (urb->iso_frame_desc[i].status != -EXDEV)
 285                                 STK_ERROR("Frame %d has error %d\n", i,
 286                                         urb->iso_frame_desc[i].status);
 287                         continue;
 288                 }
 289                 framelen = urb->iso_frame_desc[i].actual_length;
 290                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 291
 292                 if (framelen <= 4)
 293                         continue; /* no data */
 294
 295                 /*
 296                  * we found something informational from there
 297                  * the isoc frames have to type of headers
 298                  * type1: 00 xx 00 00 or 20 xx 00 00
 299                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 300                  * xx is a sequencer which has never been seen over 0x3f
 301                  * imho data written down looks like bayer, i see similarities
 302                  * after every 640 bytes
 303                  */
 304                 if (*iso_buf & 0x80) {
 305                         framelen -= 8;
 306                         iso_buf += 8;
 307                         /* This marks a new frame */
 308                         if (fb->v4lbuf.bytesused != 0
 309                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 310                                 (void) (printk_ratelimit() &&
 311                                 STK_ERROR("frame %d, "
 312                                         "bytesused=%d, skipping\n",
 313                                         i, fb->v4lbuf.bytesused));
 314                                 fb->v4lbuf.bytesused = 0;
 315                                 fill = fb->buffer;
 316                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
 317                                 if (list_is_singular(&dev->sio_avail)) {
 318                                         /* Always reuse the last buffer */
 319                                         fb->v4lbuf.bytesused = 0;
 320                                         fill = fb->buffer;
 321                                 } else {
 322                                         list_move_tail(dev->sio_avail.next,
 323                                                 &dev->sio_full);
 324                                         wake_up(&dev->wait_frame);
 325                                         fb = list_first_entry(&dev->sio_avail,
 326                                                 struct stk_sio_buffer, list);
 327                                         fb->v4lbuf.bytesused = 0;
 328                                         fill = fb->buffer;
 329                                 }
 330                         }
 331                 } else {
 332                         framelen -= 4;
 333                         iso_buf += 4;
 334                 }
 335
 336                 /* Our buffer is full !!! */
 337                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
 338                         (void) (printk_ratelimit() &&
 339                         STK_ERROR("Frame buffer overflow, lost sync\n"));
 340                         /*FIXME Do something here? */
 341                         continue;
 342                 }
 343                 spin_unlock_irqrestore(&dev->spinlock, flags);
 344                 memcpy(fill, iso_buf, framelen);
 345                 spin_lock_irqsave(&dev->spinlock, flags);
 346                 fill += framelen;
 347
 348                 /* New size of our buffer */
 349                 fb->v4lbuf.bytesused += framelen;
 350         }
 351
 352 resubmit:
 353         spin_unlock_irqrestore(&dev->spinlock, flags);
 354         urb->dev = dev->udev;
 355         ret = usb_submit_urb(urb, GFP_ATOMIC);
 356         if (ret != 0) {
 357                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
 358                         ret);
 359         }
 360 }
 361
 362 /* -------------------------------------------- */
 363
 364 static int stk_prepare_iso(struct stk_camera *dev)
 365 {
 366         void *kbuf;
 367         int i, j;
 368         struct urb *urb;
 369         struct usb_device *udev;
 370
 371         if (dev == NULL)
 372                 return -ENXIO;
 373         udev = dev->udev;
 374
 375         if (dev->isobufs)
 376                 STK_ERROR("isobufs already allocated. Bad\n");
 377         else
 378                 dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
 379                                         GFP_KERNEL);
 380         if (dev->isobufs == NULL) {
 381                 STK_ERROR("Unable to allocate iso buffers\n");
 382                 return -ENOMEM;
 383         }
 384         for (i = 0; i < MAX_ISO_BUFS; i++) {
 385                 if (dev->isobufs[i].data == NULL) {
 386                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 387                         if (kbuf == NULL) {
 388                                 STK_ERROR("Failed to allocate iso buffer %d\n",
 389                                         i);
 390                                 goto isobufs_out;
 391                         }
 392                         dev->isobufs[i].data = kbuf;
 393                 } else
 394                         STK_ERROR("isobuf data already allocated\n");
 395                 if (dev->isobufs[i].urb == NULL) {
 396                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 397                         if (urb == NULL) {
 398                                 STK_ERROR("Failed to allocate URB %d\n", i);
 399                                 goto isobufs_out;
 400                         }
 401                         dev->isobufs[i].urb = urb;
 402                 } else {
 403                         STK_ERROR("Killing URB\n");
 404                         usb_kill_urb(dev->isobufs[i].urb);
 405                         urb = dev->isobufs[i].urb;
 406                 }
 407                 urb->interval = 1;
 408                 urb->dev = udev;
 409                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 410                 urb->transfer_flags = URB_ISO_ASAP;
 411                 urb->transfer_buffer = dev->isobufs[i].data;
 412                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 413                 urb->complete = stk_isoc_handler;
 414                 urb->context = dev;
 415                 urb->start_frame = 0;
 416                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 417
 418                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 419                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 420                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 421                 }
 422         }
 423         set_memallocd(dev);
 424         return 0;
 425
 426 isobufs_out:
 427         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 428                 kfree(dev->isobufs[i].data);
 429         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 430                 usb_free_urb(dev->isobufs[i].urb);
 431         kfree(dev->isobufs);
 432         dev->isobufs = NULL;
 433         return -ENOMEM;
 434 }
 435
 436 static void stk_clean_iso(struct stk_camera *dev)
 437 {
 438         int i;
 439
 440         if (dev == NULL || dev->isobufs == NULL)
 441                 return;
 442
 443         for (i = 0; i < MAX_ISO_BUFS; i++) {
 444                 struct urb *urb;
 445
 446                 urb = dev->isobufs[i].urb;
 447                 if (urb) {
 448                         if (atomic_read(&dev->urbs_used) && is_present(dev))
 449                                 usb_kill_urb(urb);
 450                         usb_free_urb(urb);
 451                 }
 452                 kfree(dev->isobufs[i].data);
 453         }
 454         kfree(dev->isobufs);
 455         dev->isobufs = NULL;
 456         unset_memallocd(dev);
 457 }
 458
 459 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 460 {
 461         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 462         INIT_LIST_HEAD(&buf->list);
 463         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 464         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 465         if (buf->buffer == NULL)
 466                 return -ENOMEM;
 467         buf->mapcount = 0;
 468         buf->dev = dev;
 469         buf->v4lbuf.index = index;
 470         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 471         buf->v4lbuf.field = V4L2_FIELD_NONE;
 472         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 473         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 474         return 0;
 475 }
 476
 477 static int stk_free_sio_buffers(struct stk_camera *dev)
 478 {
 479         int i;
 480         int nbufs;
 481         unsigned long flags;
 482         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 483                 return 0;
 484         /*
 485         * If any buffers are mapped, we cannot free them at all.
 486         */
 487         for (i = 0; i < dev->n_sbufs; i++) {
 488                 if (dev->sio_bufs[i].mapcount > 0)
 489                         return -EBUSY;
 490         }
 491         /*
 492         * OK, let's do it.
 493         */
 494         spin_lock_irqsave(&dev->spinlock, flags);
 495         INIT_LIST_HEAD(&dev->sio_avail);
 496         INIT_LIST_HEAD(&dev->sio_full);
 497         nbufs = dev->n_sbufs;
 498         dev->n_sbufs = 0;
 499         spin_unlock_irqrestore(&dev->spinlock, flags);
 500         for (i = 0; i < nbufs; i++) {
 501                 if (dev->sio_bufs[i].buffer != NULL)
 502                         vfree(dev->sio_bufs[i].buffer);
 503         }
 504         kfree(dev->sio_bufs);
 505         dev->sio_bufs = NULL;
 506         return 0;
 507 }
 508
 509 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 510 {
 511         int i;
 512         if (dev->sio_bufs != NULL)
 513                 STK_ERROR("sio_bufs already allocated\n");
 514         else {
 515                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
 516                                 GFP_KERNEL);
 517                 if (dev->sio_bufs == NULL)
 518                         return -ENOMEM;
 519                 for (i = 0; i < n_sbufs; i++) {
 520                         if (stk_setup_siobuf(dev, i))
 521                                 return (dev->n_sbufs > 1)? 0 : -ENOMEM;
 522                         dev->n_sbufs = i+1;
 523                 }
 524         }
 525         return 0;
 526 }
 527
 528 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 529 {
 530         int err;
 531         err = stk_prepare_iso(dev);
 532         if (err) {
 533                 stk_clean_iso(dev);
 534                 return err;
 535         }
 536         err = stk_prepare_sio_buffers(dev, n_sbufs);
 537         if (err) {
 538                 stk_free_sio_buffers(dev);
 539                 return err;
 540         }
 541         return 0;
 542 }
 543
 544 static void stk_free_buffers(struct stk_camera *dev)
 545 {
 546         stk_clean_iso(dev);
 547         stk_free_sio_buffers(dev);
 548 }
 549 /* -------------------------------------------- */
 550
 551 /* v4l file operations */
 552
 553 static int v4l_stk_open(struct file *fp)
 554 {
 555         struct stk_camera *dev;
 556         struct video_device *vdev;
 557
 558         vdev = video_devdata(fp);
 559         dev = vdev_to_camera(vdev);
 560
 561         if (dev == NULL || !is_present(dev)) {
 562                 return -ENXIO;
 563         }
 564         fp->private_data = dev;
 565         usb_autopm_get_interface(dev->interface);
 566
 567         return 0;
 568 }
 569
 570 static int v4l_stk_release(struct file *fp)
 571 {
 572         struct stk_camera *dev = fp->private_data;
 573
 574         if (dev->owner == fp) {
 575                 stk_stop_stream(dev);
 576                 stk_free_buffers(dev);
 577                 stk_camera_write_reg(dev, 0x0, 0x48); /* turn off the LED */
 578                 unset_initialised(dev);
 579                 dev->owner = NULL;
 580         }
 581
 582         if(is_present(dev))
 583                 usb_autopm_put_interface(dev->interface);
 584
 585         return 0;
 586 }
 587
 588 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 589                 size_t count, loff_t *f_pos)
 590 {
 591         int i;
 592         int ret;
 593         unsigned long flags;
 594         struct stk_sio_buffer *sbuf;
 595         struct stk_camera *dev = fp->private_data;
 596
 597         if (!is_present(dev))
 598                 return -EIO;
 599         if (dev->owner && dev->owner != fp)
 600                 return -EBUSY;
 601         dev->owner = fp;
 602         if (!is_streaming(dev)) {
 603                 if (stk_initialise(dev)
 604                         || stk_allocate_buffers(dev, 3)
 605                         || stk_start_stream(dev))
 606                         return -ENOMEM;
 607                 spin_lock_irqsave(&dev->spinlock, flags);
 608                 for (i = 0; i < dev->n_sbufs; i++) {
 609                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 610                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 611                 }
 612                 spin_unlock_irqrestore(&dev->spinlock, flags);
 613         }
 614         if (*f_pos == 0) {
 615                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 616                         return -EWOULDBLOCK;
 617                 ret = wait_event_interruptible(dev->wait_frame,
 618                         !list_empty(&dev->sio_full) || !is_present(dev));
 619                 if (ret)
 620                         return ret;
 621                 if (!is_present(dev))
 622                         return -EIO;
 623         }
 624         if (count + *f_pos > dev->frame_size)
 625                 count = dev->frame_size - *f_pos;
 626         spin_lock_irqsave(&dev->spinlock, flags);
 627         if (list_empty(&dev->sio_full)) {
 628                 spin_unlock_irqrestore(&dev->spinlock, flags);
 629                 STK_ERROR("BUG: No siobufs ready\n");
 630                 return 0;
 631         }
 632         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 633         spin_unlock_irqrestore(&dev->spinlock, flags);
 634
 635         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 636                 return -EFAULT;
 637
 638         *f_pos += count;
 639
 640         if (*f_pos >= dev->frame_size) {
 641                 *f_pos = 0;
 642                 spin_lock_irqsave(&dev->spinlock, flags);
 643                 list_move_tail(&sbuf->list, &dev->sio_avail);
 644                 spin_unlock_irqrestore(&dev->spinlock, flags);
 645         }
 646         return count;
 647 }
 648
 649 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
 650 {
 651         struct stk_camera *dev = fp->private_data;
 652
 653         poll_wait(fp, &dev->wait_frame, wait);
 654
 655         if (!is_present(dev))
 656                 return POLLERR;
 657
 658         if (!list_empty(&dev->sio_full))
 659                 return (POLLIN | POLLRDNORM);
 660
 661         return 0;
 662 }
 663
 664
 665 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 666 {
 667         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 668         sbuf->mapcount++;
 669 }
 670 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 671 {
 672         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 673         sbuf->mapcount--;
 674         if (sbuf->mapcount == 0)
 675                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 676 }
 677 static const struct vm_operations_struct stk_v4l_vm_ops = {
 678         .open = stk_v4l_vm_open,
 679         .close = stk_v4l_vm_close
 680 };
 681
 682 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 683 {
 684         unsigned int i;
 685         int ret;
 686         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 687         struct stk_camera *dev = fp->private_data;
 688         struct stk_sio_buffer *sbuf = NULL;
 689
 690         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 691                 return -EINVAL;
 692
 693         for (i = 0; i < dev->n_sbufs; i++) {
 694                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 695                         sbuf = dev->sio_bufs + i;
 696                         break;
 697                 }
 698         }
 699         if (sbuf == NULL)
 700                 return -EINVAL;
 701         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 702         if (ret)
 703                 return ret;
 704         vma->vm_flags |= VM_DONTEXPAND;
 705         vma->vm_private_data = sbuf;
 706         vma->vm_ops = &stk_v4l_vm_ops;
 707         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 708         stk_v4l_vm_open(vma);
 709         return 0;
 710 }
 711
 712 /* v4l ioctl handlers */
 713
 714 static int stk_vidioc_querycap(struct file *filp,
 715                 void *priv, struct v4l2_capability *cap)
 716 {
 717         strcpy(cap->driver, "stk");
 718         strcpy(cap->card, "stk");
 719         cap->version = DRIVER_VERSION_NUM;
 720
 721         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
 722                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 723         return 0;
 724 }
 725
 726 static int stk_vidioc_enum_input(struct file *filp,
 727                 void *priv, struct v4l2_input *input)
 728 {
 729         if (input->index != 0)
 730                 return -EINVAL;
 731
 732         strcpy(input->name, "Syntek USB Camera");
 733         input->type = V4L2_INPUT_TYPE_CAMERA;
 734         return 0;
 735 }
 736
 737
 738 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 739 {
 740         *i = 0;
 741         return 0;
 742 }
 743
 744 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 745 {
 746         if (i != 0)
 747                 return -EINVAL;
 748         else
 749                 return 0;
 750 }
 751
 752 /* from vivi.c */
 753 static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
 754 {
 755         return 0;
 756 }
 757
 758 /* List of all V4Lv2 controls supported by the driver */
 759 static struct v4l2_queryctrl stk_controls[] = {
 760         {
 761                 .id      = V4L2_CID_BRIGHTNESS,
 762                 .type    = V4L2_CTRL_TYPE_INTEGER,
 763                 .name    = "Brightness",
 764                 .minimum = 0,
 765                 .maximum = 0xffff,
 766                 .step    = 0x0100,
 767                 .default_value = 0x6000,
 768         },
 769         {
 770                 .id      = V4L2_CID_HFLIP,
 771                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 772                 .name    = "Horizontal Flip",
 773                 .minimum = 0,
 774                 .maximum = 1,
 775                 .step    = 1,
 776                 .default_value = 1,
 777         },
 778         {
 779                 .id      = V4L2_CID_VFLIP,
 780                 .type    = V4L2_CTRL_TYPE_BOOLEAN,
 781                 .name    = "Vertical Flip",
 782                 .minimum = 0,
 783                 .maximum = 1,
 784                 .step    = 1,
 785                 .default_value = 1,
 786         },
 787 };
 788
 789 static int stk_vidioc_queryctrl(struct file *filp,
 790                 void *priv, struct v4l2_queryctrl *c)
 791 {
 792         int i;
 793         int nbr;
 794         nbr = ARRAY_SIZE(stk_controls);
 795
 796         for (i = 0; i < nbr; i++) {
 797                 if (stk_controls[i].id == c->id) {
 798                         memcpy(c, &stk_controls[i],
 799                                 sizeof(struct v4l2_queryctrl));
 800                         return 0;
 801                 }
 802         }
 803         return -EINVAL;
 804 }
 805
 806 static int stk_vidioc_g_ctrl(struct file *filp,
 807                 void *priv, struct v4l2_control *c)
 808 {
 809         struct stk_camera *dev = priv;
 810         switch (c->id) {
 811         case V4L2_CID_BRIGHTNESS:
 812                 c->value = dev->vsettings.brightness;
 813                 break;
 814         case V4L2_CID_HFLIP:
 815                 c->value = dev->vsettings.hflip;
 816                 break;
 817         case V4L2_CID_VFLIP:
 818                 c->value = dev->vsettings.vflip;
 819                 break;
 820         default:
 821                 return -EINVAL;
 822         }
 823         return 0;
 824 }
 825
 826 static int stk_vidioc_s_ctrl(struct file *filp,
 827                 void *priv, struct v4l2_control *c)
 828 {
 829         struct stk_camera *dev = priv;
 830         switch (c->id) {
 831         case V4L2_CID_BRIGHTNESS:
 832                 dev->vsettings.brightness = c->value;
 833                 return stk_sensor_set_brightness(dev, c->value >> 8);
 834         case V4L2_CID_HFLIP:
 835                 dev->vsettings.hflip = c->value;
 836                 return 0;
 837         case V4L2_CID_VFLIP:
 838                 dev->vsettings.vflip = c->value;
 839                 return 0;
 840         default:
 841                 return -EINVAL;
 842         }
 843         return 0;
 844 }
 845
 846
 847 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
 848                 void *priv, struct v4l2_fmtdesc *fmtd)
 849 {
 850         switch (fmtd->index) {
 851         case 0:
 852                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 853                 strcpy(fmtd->description, "r5g6b5");
 854                 break;
 855         case 1:
 856                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 857                 strcpy(fmtd->description, "r5g6b5BE");
 858                 break;
 859         case 2:
 860                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 861                 strcpy(fmtd->description, "yuv4:2:2");
 862                 break;
 863         case 3:
 864                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 865                 strcpy(fmtd->description, "Raw bayer");
 866                 break;
 867         case 4:
 868                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 869                 strcpy(fmtd->description, "yuv4:2:2");
 870                 break;
 871         default:
 872                 return -EINVAL;
 873         }
 874         return 0;
 875 }
 876
 877 static struct stk_size {
 878         unsigned w;
 879         unsigned h;
 880         enum stk_mode m;
 881 } stk_sizes[] = {
 882         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
 883         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
 884         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
 885         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
 886         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
 887 };
 888
 889 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 890                 void *priv, struct v4l2_format *f)
 891 {
 892         struct v4l2_pix_format *pix_format = &f->fmt.pix;
 893         struct stk_camera *dev = priv;
 894         int i;
 895
 896         for (i = 0; i < ARRAY_SIZE(stk_sizes)
 897                         && stk_sizes[i].m != dev->vsettings.mode;
 898                 i++);
 899         if (i == ARRAY_SIZE(stk_sizes)) {
 900                 STK_ERROR("ERROR: mode invalid\n");
 901                 return -EINVAL;
 902         }
 903         pix_format->width = stk_sizes[i].w;
 904         pix_format->height = stk_sizes[i].h;
 905         pix_format->field = V4L2_FIELD_NONE;
 906         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
 907         pix_format->pixelformat = dev->vsettings.palette;
 908         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 909                 pix_format->bytesperline = pix_format->width;
 910         else
 911                 pix_format->bytesperline = 2 * pix_format->width;
 912         pix_format->sizeimage = pix_format->bytesperline
 913                                 * pix_format->height;
 914         return 0;
 915 }
 916
 917 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 918                 void *priv, struct v4l2_format *fmtd)
 919 {
 920         int i;
 921         switch (fmtd->fmt.pix.pixelformat) {
 922         case V4L2_PIX_FMT_RGB565:
 923         case V4L2_PIX_FMT_RGB565X:
 924         case V4L2_PIX_FMT_UYVY:
 925         case V4L2_PIX_FMT_YUYV:
 926         case V4L2_PIX_FMT_SBGGR8:
 927                 break;
 928         default:
 929                 return -EINVAL;
 930         }
 931         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
 932                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
 933                         break;
 934         }
 935         if (i == ARRAY_SIZE(stk_sizes)
 936                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
 937                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 938                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
 939                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
 940                 fmtd->fmt.pix.priv = i - 1;
 941         } else {
 942                 fmtd->fmt.pix.height = stk_sizes[i].h;
 943                 fmtd->fmt.pix.width = stk_sizes[i].w;
 944                 fmtd->fmt.pix.priv = i;
 945         }
 946
 947         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
 948         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 949         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
 950                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
 951         else
 952                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 953         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 954                 * fmtd->fmt.pix.height;
 955         return 0;
 956 }
 957
 958 static int stk_setup_format(struct stk_camera *dev)
 959 {
 960         int i = 0;
 961         int depth;
 962         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 963                 depth = 1;
 964         else
 965                 depth = 2;
 966         while (i < ARRAY_SIZE(stk_sizes) &&
 967                         stk_sizes[i].m != dev->vsettings.mode)
 968                 i++;
 969         if (i == ARRAY_SIZE(stk_sizes)) {
 970                 STK_ERROR("Something is broken in %s\n", __func__);
 971                 return -EFAULT;
 972         }
 973         /* This registers controls some timings, not sure of what. */
 974         stk_camera_write_reg(dev, 0x001b, 0x0e);
 975         if (dev->vsettings.mode == MODE_SXGA)
 976                 stk_camera_write_reg(dev, 0x001c, 0x0e);
 977         else
 978                 stk_camera_write_reg(dev, 0x001c, 0x46);
 979         /*
 980          * Registers 0x0115 0x0114 are the size of each line (bytes),
 981          * regs 0x0117 0x0116 are the heigth of the image.
 982          */
 983         stk_camera_write_reg(dev, 0x0115,
 984                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
 985         stk_camera_write_reg(dev, 0x0114,
 986                 (stk_sizes[i].w * depth) & 0xff);
 987         stk_camera_write_reg(dev, 0x0117,
 988                 (stk_sizes[i].h >> 8) & 0xff);
 989         stk_camera_write_reg(dev, 0x0116,
 990                 stk_sizes[i].h & 0xff);
 991         return stk_sensor_configure(dev);
 992 }
 993
 994 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
 995                 void *priv, struct v4l2_format *fmtd)
 996 {
 997         int ret;
 998         struct stk_camera *dev = priv;
 999
1000         if (dev == NULL)
1001                 return -ENODEV;
1002         if (!is_present(dev))
1003                 return -ENODEV;
1004         if (is_streaming(dev))
1005                 return -EBUSY;
1006         if (dev->owner && dev->owner != filp)
1007                 return -EBUSY;
1008         ret = stk_vidioc_try_fmt_vid_cap(filp, priv, fmtd);
1009         if (ret)
1010                 return ret;
1011         dev->owner = filp;
1012
1013         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1014         stk_free_buffers(dev);
1015         dev->frame_size = fmtd->fmt.pix.sizeimage;
1016         dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;
1017
1018         stk_initialise(dev);
1019         return stk_setup_format(dev);
1020 }
1021
1022 static int stk_vidioc_reqbufs(struct file *filp,
1023                 void *priv, struct v4l2_requestbuffers *rb)
1024 {
1025         struct stk_camera *dev = priv;
1026
1027         if (dev == NULL)
1028                 return -ENODEV;
1029         if (rb->memory != V4L2_MEMORY_MMAP)
1030                 return -EINVAL;
1031         if (is_streaming(dev)
1032                 || (dev->owner && dev->owner != filp))
1033                 return -EBUSY;
1034         dev->owner = filp;
1035
1036         /*FIXME If they ask for zero, we must stop streaming and free */
1037         if (rb->count < 3)
1038                 rb->count = 3;
1039         /* Arbitrary limit */
1040         else if (rb->count > 5)
1041                 rb->count = 5;
1042
1043         stk_allocate_buffers(dev, rb->count);
1044         rb->count = dev->n_sbufs;
1045         return 0;
1046 }
1047
1048 static int stk_vidioc_querybuf(struct file *filp,
1049                 void *priv, struct v4l2_buffer *buf)
1050 {
1051         struct stk_camera *dev = priv;
1052         struct stk_sio_buffer *sbuf;
1053
1054         if (buf->index >= dev->n_sbufs)
1055                 return -EINVAL;
1056         sbuf = dev->sio_bufs + buf->index;
1057         *buf = sbuf->v4lbuf;
1058         return 0;
1059 }
1060
1061 static int stk_vidioc_qbuf(struct file *filp,
1062                 void *priv, struct v4l2_buffer *buf)
1063 {
1064         struct stk_camera *dev = priv;
1065         struct stk_sio_buffer *sbuf;
1066         unsigned long flags;
1067
1068         if (buf->memory != V4L2_MEMORY_MMAP)
1069                 return -EINVAL;
1070
1071         if (buf->index >= dev->n_sbufs)
1072                 return -EINVAL;
1073         sbuf = dev->sio_bufs + buf->index;
1074         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1075                 return 0;
1076         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1077         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1078         spin_lock_irqsave(&dev->spinlock, flags);
1079         list_add_tail(&sbuf->list, &dev->sio_avail);
1080         *buf = sbuf->v4lbuf;
1081         spin_unlock_irqrestore(&dev->spinlock, flags);
1082         return 0;
1083 }
1084
1085 static int stk_vidioc_dqbuf(struct file *filp,
1086                 void *priv, struct v4l2_buffer *buf)
1087 {
1088         struct stk_camera *dev = priv;
1089         struct stk_sio_buffer *sbuf;
1090         unsigned long flags;
1091         int ret;
1092
1093         if (!is_streaming(dev))
1094                 return -EINVAL;
1095
1096         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1097                 return -EWOULDBLOCK;
1098         ret = wait_event_interruptible(dev->wait_frame,
1099                 !list_empty(&dev->sio_full) || !is_present(dev));
1100         if (ret)
1101                 return ret;
1102         if (!is_present(dev))
1103                 return -EIO;
1104
1105         spin_lock_irqsave(&dev->spinlock, flags);
1106         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1107         list_del_init(&sbuf->list);
1108         spin_unlock_irqrestore(&dev->spinlock, flags);
1109         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1110         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1111         sbuf->v4lbuf.sequence = ++dev->sequence;
1112         do_gettimeofday(&sbuf->v4lbuf.timestamp);
1113
1114         *buf = sbuf->v4lbuf;
1115         return 0;
1116 }
1117
1118 static int stk_vidioc_streamon(struct file *filp,
1119                 void *priv, enum v4l2_buf_type type)
1120 {
1121         struct stk_camera *dev = priv;
1122         if (is_streaming(dev))
1123                 return 0;
1124         if (dev->sio_bufs == NULL)
1125                 return -EINVAL;
1126         dev->sequence = 0;
1127         return stk_start_stream(dev);
1128 }
1129
1130 static int stk_vidioc_streamoff(struct file *filp,
1131                 void *priv, enum v4l2_buf_type type)
1132 {
1133         struct stk_camera *dev = priv;
1134         unsigned long flags;
1135         int i;
1136         stk_stop_stream(dev);
1137         spin_lock_irqsave(&dev->spinlock, flags);
1138         INIT_LIST_HEAD(&dev->sio_avail);
1139         INIT_LIST_HEAD(&dev->sio_full);
1140         for (i = 0; i < dev->n_sbufs; i++) {
1141                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1142                 dev->sio_bufs[i].v4lbuf.flags = 0;
1143         }
1144         spin_unlock_irqrestore(&dev->spinlock, flags);
1145         return 0;
1146 }
1147
1148
1149 static int stk_vidioc_g_parm(struct file *filp,
1150                 void *priv, struct v4l2_streamparm *sp)
1151 {
1152         /*FIXME This is not correct */
1153         sp->parm.capture.timeperframe.numerator = 1;
1154         sp->parm.capture.timeperframe.denominator = 30;
1155         sp->parm.capture.readbuffers = 2;
1156         return 0;
1157 }
1158
1159 static int stk_vidioc_enum_framesizes(struct file *filp,
1160                 void *priv, struct v4l2_frmsizeenum *frms)
1161 {
1162         if (frms->index >= ARRAY_SIZE(stk_sizes))
1163                 return -EINVAL;
1164         switch (frms->pixel_format) {
1165         case V4L2_PIX_FMT_RGB565:
1166         case V4L2_PIX_FMT_RGB565X:
1167         case V4L2_PIX_FMT_UYVY:
1168         case V4L2_PIX_FMT_YUYV:
1169         case V4L2_PIX_FMT_SBGGR8:
1170                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1171                 frms->discrete.width = stk_sizes[frms->index].w;
1172                 frms->discrete.height = stk_sizes[frms->index].h;
1173                 return 0;
1174         default: return -EINVAL;
1175         }
1176 }
1177
1178 static struct v4l2_file_operations v4l_stk_fops = {
1179         .owner = THIS_MODULE,
1180         .open = v4l_stk_open,
1181         .release = v4l_stk_release,
1182         .read = v4l_stk_read,
1183         .poll = v4l_stk_poll,
1184         .mmap = v4l_stk_mmap,
1185         .ioctl = video_ioctl2,
1186 };
1187
1188 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1189         .vidioc_querycap = stk_vidioc_querycap,
1190         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1191         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1192         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1193         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1194         .vidioc_enum_input = stk_vidioc_enum_input,
1195         .vidioc_s_input = stk_vidioc_s_input,
1196         .vidioc_g_input = stk_vidioc_g_input,
1197         .vidioc_s_std = stk_vidioc_s_std,
1198         .vidioc_reqbufs = stk_vidioc_reqbufs,
1199         .vidioc_querybuf = stk_vidioc_querybuf,
1200         .vidioc_qbuf = stk_vidioc_qbuf,
1201         .vidioc_dqbuf = stk_vidioc_dqbuf,
1202         .vidioc_streamon = stk_vidioc_streamon,
1203         .vidioc_streamoff = stk_vidioc_streamoff,
1204         .vidioc_queryctrl = stk_vidioc_queryctrl,
1205         .vidioc_g_ctrl = stk_vidioc_g_ctrl,
1206         .vidioc_s_ctrl = stk_vidioc_s_ctrl,
1207         .vidioc_g_parm = stk_vidioc_g_parm,
1208         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1209 };
1210
1211 static void stk_v4l_dev_release(struct video_device *vd)
1212 {
1213         struct stk_camera *dev = vdev_to_camera(vd);
1214
1215         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1216                 STK_ERROR("We are leaking memory\n");
1217         usb_put_intf(dev->interface);
1218         kfree(dev);
1219 }
1220
1221 static struct video_device stk_v4l_data = {
1222         .name = "stkwebcam",
1223         .tvnorms = V4L2_STD_UNKNOWN,
1224         .current_norm = V4L2_STD_UNKNOWN,
1225         .fops = &v4l_stk_fops,
1226         .ioctl_ops = &v4l_stk_ioctl_ops,
1227         .release = stk_v4l_dev_release,
1228 };
1229
1230
1231 static int stk_register_video_device(struct stk_camera *dev)
1232 {
1233         int err;
1234
1235         dev->vdev = stk_v4l_data;
1236         dev->vdev.debug = debug;
1237         dev->vdev.parent = &dev->interface->dev;
1238         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1239         if (err)
1240                 STK_ERROR("v4l registration failed\n");
1241         else
1242                 STK_INFO("Syntek USB2.0 Camera is now controlling device %s\n",
1243                          video_device_node_name(&dev->vdev));
1244         return err;
1245 }
1246
1247
1248 /* USB Stuff */
1249
1250 static int stk_camera_probe(struct usb_interface *interface,
1251                 const struct usb_device_id *id)
1252 {
1253         int i;
1254         int err = 0;
1255
1256         struct stk_camera *dev = NULL;
1257         struct usb_device *udev = interface_to_usbdev(interface);
1258         struct usb_host_interface *iface_desc;
1259         struct usb_endpoint_descriptor *endpoint;
1260
1261         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1262         if (dev == NULL) {
1263                 STK_ERROR("Out of memory !\n");
1264                 return -ENOMEM;
1265         }
1266
1267         spin_lock_init(&dev->spinlock);
1268         init_waitqueue_head(&dev->wait_frame);
1269
1270         dev->udev = udev;
1271         dev->interface = interface;
1272         usb_get_intf(interface);
1273
1274         dev->vsettings.vflip = vflip;
1275         dev->vsettings.hflip = hflip;
1276         dev->n_sbufs = 0;
1277         set_present(dev);
1278
1279         /* Set up the endpoint information
1280          * use only the first isoc-in endpoint
1281          * for the current alternate setting */
1282         iface_desc = interface->cur_altsetting;
1283
1284         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1285                 endpoint = &iface_desc->endpoint[i].desc;
1286
1287                 if (!dev->isoc_ep
1288                         && usb_endpoint_is_isoc_in(endpoint)) {
1289                         /* we found an isoc in endpoint */
1290                         dev->isoc_ep = usb_endpoint_num(endpoint);
1291                         break;
1292                 }
1293         }
1294         if (!dev->isoc_ep) {
1295                 STK_ERROR("Could not find isoc-in endpoint");
1296                 err = -ENODEV;
1297                 goto error;
1298         }
1299         dev->vsettings.brightness = 0x7fff;
1300         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1301         dev->vsettings.mode = MODE_VGA;
1302         dev->frame_size = 640 * 480 * 2;
1303
1304         INIT_LIST_HEAD(&dev->sio_avail);
1305         INIT_LIST_HEAD(&dev->sio_full);
1306
1307         usb_set_intfdata(interface, dev);
1308
1309         err = stk_register_video_device(dev);
1310         if (err) {
1311                 goto error;
1312         }
1313
1314         return 0;
1315
1316 error:
1317         kfree(dev);
1318         return err;
1319 }
1320
1321 static void stk_camera_disconnect(struct usb_interface *interface)
1322 {
1323         struct stk_camera *dev = usb_get_intfdata(interface);
1324
1325         usb_set_intfdata(interface, NULL);
1326         unset_present(dev);
1327
1328         wake_up_interruptible(&dev->wait_frame);
1329
1330         STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
1331                  video_device_node_name(&dev->vdev));
1332
1333         video_unregister_device(&dev->vdev);
1334 }
1335
1336 #ifdef CONFIG_PM
1337 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1338 {
1339         struct stk_camera *dev = usb_get_intfdata(intf);
1340         if (is_streaming(dev)) {
1341                 stk_stop_stream(dev);
1342                 /* yes, this is ugly */
1343                 set_streaming(dev);
1344         }
1345         return 0;
1346 }
1347
1348 static int stk_camera_resume(struct usb_interface *intf)
1349 {
1350         struct stk_camera *dev = usb_get_intfdata(intf);
1351         if (!is_initialised(dev))
1352                 return 0;
1353         unset_initialised(dev);
1354         stk_initialise(dev);
1355         stk_setup_format(dev);
1356         if (is_streaming(dev))
1357                 stk_start_stream(dev);
1358         return 0;
1359 }
1360 #endif
1361
1362 static struct usb_driver stk_camera_driver = {
1363         .name = "stkwebcam",
1364         .probe = stk_camera_probe,
1365         .disconnect = stk_camera_disconnect,
1366         .id_table = stkwebcam_table,
1367 #ifdef CONFIG_PM
1368         .suspend = stk_camera_suspend,
1369         .resume = stk_camera_resume,
1370 #endif
1371 };
1372
1373
1374 static int __init stk_camera_init(void)
1375 {
1376         int result;
1377
1378         result = usb_register(&stk_camera_driver);
1379         if (result)
1380                 STK_ERROR("usb_register failed ! Error number %d\n", result);
1381
1382
1383         return result;
1384 }
1385
1386 static void __exit stk_camera_exit(void)
1387 {
1388         usb_deregister(&stk_camera_driver);
1389 }
1390
1391 module_init(stk_camera_init);
1392 module_exit(stk_camera_exit);
1393
1394