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

   1 /*
   2  * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
   3  *
   4  * Copyright (C) 2006 Nicolas VIVIEN
   5  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
   6  *
   7  * Some parts are inspired from cafe_ccic.c
   8  * Copyright 2006-2007 Jonathan Corbet
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/slab.h>
  28
  29 #include <linux/dmi.h>
  30 #include <linux/usb.h>
  31 #include <linux/mm.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/videodev2.h>
  34 #include <media/v4l2-common.h>
  35 #include <media/v4l2-ioctl.h>
  36 #include <media/v4l2-event.h>
  37
  38 #include "stk-webcam.h"
  39
  40
  41 static int hflip = -1;
  42 module_param(hflip, int, 0444);
  43 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 0");
  44
  45 static int vflip = -1;
  46 module_param(vflip, int, 0444);
  47 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 0");
  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 /* Some cameras have audio interfaces, we aren't interested in those */
  58 static const struct usb_device_id stkwebcam_table[] = {
  59         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
  60         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
  61         { }
  62 };
  63 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
  64
  65 /*
  66  * The stk webcam laptop module is mounted upside down in some laptops :(
  67  *
  68  * Some background information (thanks to Hans de Goede for providing this):
  69  *
  70  * 1) Once upon a time the stkwebcam driver was written
  71  *
  72  * 2) The webcam in question was used mostly in Asus laptop models, including
  73  * the laptop of the original author of the driver, and in these models, in
  74  * typical Asus fashion (see the long long list for uvc cams inside v4l-utils),
  75  * they mounted the webcam-module the wrong way up. So the hflip and vflip
  76  * module options were given a default value of 1 (the correct value for
  77  * upside down mounted models)
  78  *
  79  * 3) Years later I got a bug report from a user with a laptop with stkwebcam,
  80  * where the module was actually mounted the right way up, and thus showed
  81  * upside down under Linux. So now I was facing the choice of 2 options:
  82  *
  83  * a) Add a not-upside-down list to stkwebcam, which overrules the default.
  84  *
  85  * b) Do it like all the other drivers do, and make the default right for
  86  *    cams mounted the proper way and add an upside-down model list, with
  87  *    models where we need to flip-by-default.
  88  *
  89  * Despite knowing that going b) would cause a period of pain where we were
  90  * building the table I opted to go for option b), since a) is just too ugly,
  91  * and worse different from how every other driver does it leading to
  92  * confusion in the long run. This change was made in kernel 3.6.
  93  *
  94  * So for any user report about upside-down images since kernel 3.6 ask them
  95  * to provide the output of 'sudo dmidecode' so the laptop can be added in
  96  * the table below.
  97  */
  98 static const struct dmi_system_id stk_upside_down_dmi_table[] = {
  99         {
 100                 .ident = "ASUS G1",
 101                 .matches = {
 102                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 103                         DMI_MATCH(DMI_PRODUCT_NAME, "G1")
 104                 }
 105         }, {
 106                 .ident = "ASUS F3JC",
 107                 .matches = {
 108                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 109                         DMI_MATCH(DMI_PRODUCT_NAME, "F3JC")
 110                 }
 111         },
 112         {
 113                 .ident = "T12Rg-H",
 114                 .matches = {
 115                         DMI_MATCH(DMI_SYS_VENDOR, "HCL Infosystems Limited"),
 116                         DMI_MATCH(DMI_PRODUCT_NAME, "T12Rg-H")
 117                 }
 118         },
 119         {}
 120 };
 121
 122
 123 /*
 124  * Basic stuff
 125  */
 126 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
 127 {
 128         struct usb_device *udev = dev->udev;
 129         int ret;
 130
 131         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 132                         0x01,
 133                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 134                         value,
 135                         index,
 136                         NULL,
 137                         0,
 138                         500);
 139         if (ret < 0)
 140                 return ret;
 141         else
 142                 return 0;
 143 }
 144
 145 int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value)
 146 {
 147         struct usb_device *udev = dev->udev;
 148         unsigned char *buf;
 149         int ret;
 150
 151         buf = kmalloc(sizeof(u8), GFP_KERNEL);
 152         if (!buf)
 153                 return -ENOMEM;
 154
 155         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 156                         0x00,
 157                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 158                         0x00,
 159                         index,
 160                         buf,
 161                         sizeof(u8),
 162                         500);
 163         if (ret >= 0)
 164                 *value = *buf;
 165
 166         kfree(buf);
 167
 168         if (ret < 0)
 169                 return ret;
 170         else
 171                 return 0;
 172 }
 173
 174 static int stk_start_stream(struct stk_camera *dev)
 175 {
 176         u8 value;
 177         int i, ret;
 178         u8 value_116, value_117;
 179
 180
 181         if (!is_present(dev))
 182                 return -ENODEV;
 183         if (!is_memallocd(dev) || !is_initialised(dev)) {
 184                 pr_err("FIXME: Buffers are not allocated\n");
 185                 return -EFAULT;
 186         }
 187         ret = usb_set_interface(dev->udev, 0, 5);
 188
 189         if (ret < 0)
 190                 pr_err("usb_set_interface failed !\n");
 191         if (stk_sensor_wakeup(dev))
 192                 pr_err("error awaking the sensor\n");
 193
 194         stk_camera_read_reg(dev, 0x0116, &value_116);
 195         stk_camera_read_reg(dev, 0x0117, &value_117);
 196
 197         stk_camera_write_reg(dev, 0x0116, 0x0000);
 198         stk_camera_write_reg(dev, 0x0117, 0x0000);
 199
 200         stk_camera_read_reg(dev, 0x0100, &value);
 201         stk_camera_write_reg(dev, 0x0100, value | 0x80);
 202
 203         stk_camera_write_reg(dev, 0x0116, value_116);
 204         stk_camera_write_reg(dev, 0x0117, value_117);
 205         for (i = 0; i < MAX_ISO_BUFS; i++) {
 206                 if (dev->isobufs[i].urb) {
 207                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
 208                         atomic_inc(&dev->urbs_used);
 209                         if (ret)
 210                                 return ret;
 211                 }
 212         }
 213         set_streaming(dev);
 214         return 0;
 215 }
 216
 217 static int stk_stop_stream(struct stk_camera *dev)
 218 {
 219         u8 value;
 220         int i;
 221         if (is_present(dev)) {
 222                 stk_camera_read_reg(dev, 0x0100, &value);
 223                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
 224                 if (dev->isobufs != NULL) {
 225                         for (i = 0; i < MAX_ISO_BUFS; i++) {
 226                                 if (dev->isobufs[i].urb)
 227                                         usb_kill_urb(dev->isobufs[i].urb);
 228                         }
 229                 }
 230                 unset_streaming(dev);
 231
 232                 if (usb_set_interface(dev->udev, 0, 0))
 233                         pr_err("usb_set_interface failed !\n");
 234                 if (stk_sensor_sleep(dev))
 235                         pr_err("error suspending the sensor\n");
 236         }
 237         return 0;
 238 }
 239
 240 /*
 241  * This seems to be the shortest init sequence we
 242  * must do in order to find the sensor
 243  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 244  * is also reset. Maybe powers down it?
 245  * Rest of values don't make a difference
 246  */
 247
 248 static struct regval stk1125_initvals[] = {
 249         /*TODO: What means this sequence? */
 250         {0x0000, 0x24},
 251         {0x0100, 0x21},
 252         {0x0002, 0x68},
 253         {0x0003, 0x80},
 254         {0x0005, 0x00},
 255         {0x0007, 0x03},
 256         {0x000d, 0x00},
 257         {0x000f, 0x02},
 258         {0x0300, 0x12},
 259         {0x0350, 0x41},
 260         {0x0351, 0x00},
 261         {0x0352, 0x00},
 262         {0x0353, 0x00},
 263         {0x0018, 0x10},
 264         {0x0019, 0x00},
 265         {0x001b, 0x0e},
 266         {0x001c, 0x46},
 267         {0x0300, 0x80},
 268         {0x001a, 0x04},
 269         {0x0110, 0x00},
 270         {0x0111, 0x00},
 271         {0x0112, 0x00},
 272         {0x0113, 0x00},
 273
 274         {0xffff, 0xff},
 275 };
 276
 277
 278 static int stk_initialise(struct stk_camera *dev)
 279 {
 280         struct regval *rv;
 281         int ret;
 282         if (!is_present(dev))
 283                 return -ENODEV;
 284         if (is_initialised(dev))
 285                 return 0;
 286         rv = stk1125_initvals;
 287         while (rv->reg != 0xffff) {
 288                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
 289                 if (ret)
 290                         return ret;
 291                 rv++;
 292         }
 293         if (stk_sensor_init(dev) == 0) {
 294                 set_initialised(dev);
 295                 return 0;
 296         } else
 297                 return -1;
 298 }
 299
 300 /* *********************************************** */
 301 /*
 302  * This function is called as an URB transfert is complete (Isochronous pipe).
 303  * So, the traitement is done in interrupt time, so it has be fast, not crash,
 304  * and not stall. Neat.
 305  */
 306 static void stk_isoc_handler(struct urb *urb)
 307 {
 308         int i;
 309         int ret;
 310         int framelen;
 311         unsigned long flags;
 312
 313         unsigned char *fill = NULL;
 314         unsigned char *iso_buf = NULL;
 315
 316         struct stk_camera *dev;
 317         struct stk_sio_buffer *fb;
 318
 319         dev = (struct stk_camera *) urb->context;
 320
 321         if (dev == NULL) {
 322                 pr_err("isoc_handler called with NULL device !\n");
 323                 return;
 324         }
 325
 326         if (urb->status == -ENOENT || urb->status == -ECONNRESET
 327                 || urb->status == -ESHUTDOWN) {
 328                 atomic_dec(&dev->urbs_used);
 329                 return;
 330         }
 331
 332         spin_lock_irqsave(&dev->spinlock, flags);
 333
 334         if (urb->status != -EINPROGRESS && urb->status != 0) {
 335                 pr_err("isoc_handler: urb->status == %d\n", urb->status);
 336                 goto resubmit;
 337         }
 338
 339         if (list_empty(&dev->sio_avail)) {
 340                 /*FIXME Stop streaming after a while */
 341                 pr_err_ratelimited("isoc_handler without available buffer!\n");
 342                 goto resubmit;
 343         }
 344         fb = list_first_entry(&dev->sio_avail,
 345                         struct stk_sio_buffer, list);
 346         fill = fb->buffer + fb->v4lbuf.bytesused;
 347
 348         for (i = 0; i < urb->number_of_packets; i++) {
 349                 if (urb->iso_frame_desc[i].status != 0) {
 350                         if (urb->iso_frame_desc[i].status != -EXDEV)
 351                                 pr_err("Frame %d has error %d\n",
 352                                        i, urb->iso_frame_desc[i].status);
 353                         continue;
 354                 }
 355                 framelen = urb->iso_frame_desc[i].actual_length;
 356                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 357
 358                 if (framelen <= 4)
 359                         continue; /* no data */
 360
 361                 /*
 362                  * we found something informational from there
 363                  * the isoc frames have to type of headers
 364                  * type1: 00 xx 00 00 or 20 xx 00 00
 365                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 366                  * xx is a sequencer which has never been seen over 0x3f
 367                  * imho data written down looks like bayer, i see similarities
 368                  * after every 640 bytes
 369                  */
 370                 if (*iso_buf & 0x80) {
 371                         framelen -= 8;
 372                         iso_buf += 8;
 373                         /* This marks a new frame */
 374                         if (fb->v4lbuf.bytesused != 0
 375                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 376                                 pr_err_ratelimited("frame %d, bytesused=%d, skipping\n",
 377                                                    i, fb->v4lbuf.bytesused);
 378                                 fb->v4lbuf.bytesused = 0;
 379                                 fill = fb->buffer;
 380                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
 381                                 if (list_is_singular(&dev->sio_avail)) {
 382                                         /* Always reuse the last buffer */
 383                                         fb->v4lbuf.bytesused = 0;
 384                                         fill = fb->buffer;
 385                                 } else {
 386                                         list_move_tail(dev->sio_avail.next,
 387                                                 &dev->sio_full);
 388                                         wake_up(&dev->wait_frame);
 389                                         fb = list_first_entry(&dev->sio_avail,
 390                                                 struct stk_sio_buffer, list);
 391                                         fb->v4lbuf.bytesused = 0;
 392                                         fill = fb->buffer;
 393                                 }
 394                         }
 395                 } else {
 396                         framelen -= 4;
 397                         iso_buf += 4;
 398                 }
 399
 400                 /* Our buffer is full !!! */
 401                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
 402                         pr_err_ratelimited("Frame buffer overflow, lost sync\n");
 403                         /*FIXME Do something here? */
 404                         continue;
 405                 }
 406                 spin_unlock_irqrestore(&dev->spinlock, flags);
 407                 memcpy(fill, iso_buf, framelen);
 408                 spin_lock_irqsave(&dev->spinlock, flags);
 409                 fill += framelen;
 410
 411                 /* New size of our buffer */
 412                 fb->v4lbuf.bytesused += framelen;
 413         }
 414
 415 resubmit:
 416         spin_unlock_irqrestore(&dev->spinlock, flags);
 417         urb->dev = dev->udev;
 418         ret = usb_submit_urb(urb, GFP_ATOMIC);
 419         if (ret != 0) {
 420                 pr_err("Error (%d) re-submitting urb in stk_isoc_handler\n",
 421                        ret);
 422         }
 423 }
 424
 425 /* -------------------------------------------- */
 426
 427 static int stk_prepare_iso(struct stk_camera *dev)
 428 {
 429         void *kbuf;
 430         int i, j;
 431         struct urb *urb;
 432         struct usb_device *udev;
 433
 434         if (dev == NULL)
 435                 return -ENXIO;
 436         udev = dev->udev;
 437
 438         if (dev->isobufs)
 439                 pr_err("isobufs already allocated. Bad\n");
 440         else
 441                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
 442                                        GFP_KERNEL);
 443         if (dev->isobufs == NULL) {
 444                 pr_err("Unable to allocate iso buffers\n");
 445                 return -ENOMEM;
 446         }
 447         for (i = 0; i < MAX_ISO_BUFS; i++) {
 448                 if (dev->isobufs[i].data == NULL) {
 449                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 450                         if (kbuf == NULL) {
 451                                 pr_err("Failed to allocate iso buffer %d\n", i);
 452                                 goto isobufs_out;
 453                         }
 454                         dev->isobufs[i].data = kbuf;
 455                 } else
 456                         pr_err("isobuf data already allocated\n");
 457                 if (dev->isobufs[i].urb == NULL) {
 458                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 459                         if (urb == NULL)
 460                                 goto isobufs_out;
 461                         dev->isobufs[i].urb = urb;
 462                 } else {
 463                         pr_err("Killing URB\n");
 464                         usb_kill_urb(dev->isobufs[i].urb);
 465                         urb = dev->isobufs[i].urb;
 466                 }
 467                 urb->interval = 1;
 468                 urb->dev = udev;
 469                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 470                 urb->transfer_flags = URB_ISO_ASAP;
 471                 urb->transfer_buffer = dev->isobufs[i].data;
 472                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 473                 urb->complete = stk_isoc_handler;
 474                 urb->context = dev;
 475                 urb->start_frame = 0;
 476                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 477
 478                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 479                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 480                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 481                 }
 482         }
 483         set_memallocd(dev);
 484         return 0;
 485
 486 isobufs_out:
 487         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 488                 kfree(dev->isobufs[i].data);
 489         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 490                 usb_free_urb(dev->isobufs[i].urb);
 491         kfree(dev->isobufs);
 492         dev->isobufs = NULL;
 493         return -ENOMEM;
 494 }
 495
 496 static void stk_clean_iso(struct stk_camera *dev)
 497 {
 498         int i;
 499
 500         if (dev == NULL || dev->isobufs == NULL)
 501                 return;
 502
 503         for (i = 0; i < MAX_ISO_BUFS; i++) {
 504                 struct urb *urb;
 505
 506                 urb = dev->isobufs[i].urb;
 507                 if (urb) {
 508                         if (atomic_read(&dev->urbs_used) && is_present(dev))
 509                                 usb_kill_urb(urb);
 510                         usb_free_urb(urb);
 511                 }
 512                 kfree(dev->isobufs[i].data);
 513         }
 514         kfree(dev->isobufs);
 515         dev->isobufs = NULL;
 516         unset_memallocd(dev);
 517 }
 518
 519 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 520 {
 521         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 522         INIT_LIST_HEAD(&buf->list);
 523         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 524         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 525         if (buf->buffer == NULL)
 526                 return -ENOMEM;
 527         buf->mapcount = 0;
 528         buf->dev = dev;
 529         buf->v4lbuf.index = index;
 530         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 531         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 532         buf->v4lbuf.field = V4L2_FIELD_NONE;
 533         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 534         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 535         return 0;
 536 }
 537
 538 static int stk_free_sio_buffers(struct stk_camera *dev)
 539 {
 540         int i;
 541         int nbufs;
 542         unsigned long flags;
 543         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 544                 return 0;
 545         /*
 546         * If any buffers are mapped, we cannot free them at all.
 547         */
 548         for (i = 0; i < dev->n_sbufs; i++) {
 549                 if (dev->sio_bufs[i].mapcount > 0)
 550                         return -EBUSY;
 551         }
 552         /*
 553         * OK, let's do it.
 554         */
 555         spin_lock_irqsave(&dev->spinlock, flags);
 556         INIT_LIST_HEAD(&dev->sio_avail);
 557         INIT_LIST_HEAD(&dev->sio_full);
 558         nbufs = dev->n_sbufs;
 559         dev->n_sbufs = 0;
 560         spin_unlock_irqrestore(&dev->spinlock, flags);
 561         for (i = 0; i < nbufs; i++)
 562                 vfree(dev->sio_bufs[i].buffer);
 563         kfree(dev->sio_bufs);
 564         dev->sio_bufs = NULL;
 565         return 0;
 566 }
 567
 568 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 569 {
 570         int i;
 571         if (dev->sio_bufs != NULL)
 572                 pr_err("sio_bufs already allocated\n");
 573         else {
 574                 dev->sio_bufs = kcalloc(n_sbufs,
 575                                         sizeof(struct stk_sio_buffer),
 576                                         GFP_KERNEL);
 577                 if (dev->sio_bufs == NULL)
 578                         return -ENOMEM;
 579                 for (i = 0; i < n_sbufs; i++) {
 580                         if (stk_setup_siobuf(dev, i))
 581                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
 582                         dev->n_sbufs = i+1;
 583                 }
 584         }
 585         return 0;
 586 }
 587
 588 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 589 {
 590         int err;
 591         err = stk_prepare_iso(dev);
 592         if (err) {
 593                 stk_clean_iso(dev);
 594                 return err;
 595         }
 596         err = stk_prepare_sio_buffers(dev, n_sbufs);
 597         if (err) {
 598                 stk_free_sio_buffers(dev);
 599                 return err;
 600         }
 601         return 0;
 602 }
 603
 604 static void stk_free_buffers(struct stk_camera *dev)
 605 {
 606         stk_clean_iso(dev);
 607         stk_free_sio_buffers(dev);
 608 }
 609 /* -------------------------------------------- */
 610
 611 /* v4l file operations */
 612
 613 static int v4l_stk_open(struct file *fp)
 614 {
 615         struct stk_camera *dev = video_drvdata(fp);
 616         int err;
 617
 618         if (dev == NULL || !is_present(dev))
 619                 return -ENXIO;
 620
 621         if (mutex_lock_interruptible(&dev->lock))
 622                 return -ERESTARTSYS;
 623         if (!dev->first_init)
 624                 stk_camera_write_reg(dev, 0x0, 0x24);
 625         else
 626                 dev->first_init = 0;
 627
 628         err = v4l2_fh_open(fp);
 629         if (!err)
 630                 usb_autopm_get_interface(dev->interface);
 631         mutex_unlock(&dev->lock);
 632         return err;
 633 }
 634
 635 static int v4l_stk_release(struct file *fp)
 636 {
 637         struct stk_camera *dev = video_drvdata(fp);
 638
 639         mutex_lock(&dev->lock);
 640         if (dev->owner == fp) {
 641                 stk_stop_stream(dev);
 642                 stk_free_buffers(dev);
 643                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
 644                 unset_initialised(dev);
 645                 dev->owner = NULL;
 646         }
 647
 648         usb_autopm_put_interface(dev->interface);
 649         mutex_unlock(&dev->lock);
 650         return v4l2_fh_release(fp);
 651 }
 652
 653 static ssize_t stk_read(struct file *fp, char __user *buf,
 654                 size_t count, loff_t *f_pos)
 655 {
 656         int i;
 657         int ret;
 658         unsigned long flags;
 659         struct stk_sio_buffer *sbuf;
 660         struct stk_camera *dev = video_drvdata(fp);
 661
 662         if (!is_present(dev))
 663                 return -EIO;
 664         if (dev->owner && (!dev->reading || dev->owner != fp))
 665                 return -EBUSY;
 666         dev->owner = fp;
 667         if (!is_streaming(dev)) {
 668                 if (stk_initialise(dev)
 669                         || stk_allocate_buffers(dev, 3)
 670                         || stk_start_stream(dev))
 671                         return -ENOMEM;
 672                 dev->reading = 1;
 673                 spin_lock_irqsave(&dev->spinlock, flags);
 674                 for (i = 0; i < dev->n_sbufs; i++) {
 675                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 676                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 677                 }
 678                 spin_unlock_irqrestore(&dev->spinlock, flags);
 679         }
 680         if (*f_pos == 0) {
 681                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 682                         return -EWOULDBLOCK;
 683                 ret = wait_event_interruptible(dev->wait_frame,
 684                         !list_empty(&dev->sio_full) || !is_present(dev));
 685                 if (ret)
 686                         return ret;
 687                 if (!is_present(dev))
 688                         return -EIO;
 689         }
 690         if (count + *f_pos > dev->frame_size)
 691                 count = dev->frame_size - *f_pos;
 692         spin_lock_irqsave(&dev->spinlock, flags);
 693         if (list_empty(&dev->sio_full)) {
 694                 spin_unlock_irqrestore(&dev->spinlock, flags);
 695                 pr_err("BUG: No siobufs ready\n");
 696                 return 0;
 697         }
 698         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 699         spin_unlock_irqrestore(&dev->spinlock, flags);
 700
 701         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 702                 return -EFAULT;
 703
 704         *f_pos += count;
 705
 706         if (*f_pos >= dev->frame_size) {
 707                 *f_pos = 0;
 708                 spin_lock_irqsave(&dev->spinlock, flags);
 709                 list_move_tail(&sbuf->list, &dev->sio_avail);
 710                 spin_unlock_irqrestore(&dev->spinlock, flags);
 711         }
 712         return count;
 713 }
 714
 715 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 716                 size_t count, loff_t *f_pos)
 717 {
 718         struct stk_camera *dev = video_drvdata(fp);
 719         int ret;
 720
 721         if (mutex_lock_interruptible(&dev->lock))
 722                 return -ERESTARTSYS;
 723         ret = stk_read(fp, buf, count, f_pos);
 724         mutex_unlock(&dev->lock);
 725         return ret;
 726 }
 727
 728 static __poll_t v4l_stk_poll(struct file *fp, poll_table *wait)
 729 {
 730         struct stk_camera *dev = video_drvdata(fp);
 731         __poll_t res = v4l2_ctrl_poll(fp, wait);
 732
 733         poll_wait(fp, &dev->wait_frame, wait);
 734
 735         if (!is_present(dev))
 736                 return EPOLLERR;
 737
 738         if (!list_empty(&dev->sio_full))
 739                 return res | EPOLLIN | EPOLLRDNORM;
 740
 741         return res;
 742 }
 743
 744
 745 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 746 {
 747         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 748         sbuf->mapcount++;
 749 }
 750 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 751 {
 752         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 753         sbuf->mapcount--;
 754         if (sbuf->mapcount == 0)
 755                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 756 }
 757 static const struct vm_operations_struct stk_v4l_vm_ops = {
 758         .open = stk_v4l_vm_open,
 759         .close = stk_v4l_vm_close
 760 };
 761
 762 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 763 {
 764         unsigned int i;
 765         int ret;
 766         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 767         struct stk_camera *dev = video_drvdata(fp);
 768         struct stk_sio_buffer *sbuf = NULL;
 769
 770         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 771                 return -EINVAL;
 772
 773         for (i = 0; i < dev->n_sbufs; i++) {
 774                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 775                         sbuf = dev->sio_bufs + i;
 776                         break;
 777                 }
 778         }
 779         if (sbuf == NULL)
 780                 return -EINVAL;
 781         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 782         if (ret)
 783                 return ret;
 784         vma->vm_flags |= VM_DONTEXPAND;
 785         vma->vm_private_data = sbuf;
 786         vma->vm_ops = &stk_v4l_vm_ops;
 787         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 788         stk_v4l_vm_open(vma);
 789         return 0;
 790 }
 791
 792 /* v4l ioctl handlers */
 793
 794 static int stk_vidioc_querycap(struct file *filp,
 795                 void *priv, struct v4l2_capability *cap)
 796 {
 797         struct stk_camera *dev = video_drvdata(filp);
 798
 799         strcpy(cap->driver, "stk");
 800         strcpy(cap->card, "stk");
 801         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 802
 803         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
 804                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 805         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 806         return 0;
 807 }
 808
 809 static int stk_vidioc_enum_input(struct file *filp,
 810                 void *priv, struct v4l2_input *input)
 811 {
 812         if (input->index != 0)
 813                 return -EINVAL;
 814
 815         strcpy(input->name, "Syntek USB Camera");
 816         input->type = V4L2_INPUT_TYPE_CAMERA;
 817         return 0;
 818 }
 819
 820
 821 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 822 {
 823         *i = 0;
 824         return 0;
 825 }
 826
 827 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 828 {
 829         return i ? -EINVAL : 0;
 830 }
 831
 832 static int stk_s_ctrl(struct v4l2_ctrl *ctrl)
 833 {
 834         struct stk_camera *dev =
 835                 container_of(ctrl->handler, struct stk_camera, hdl);
 836
 837         switch (ctrl->id) {
 838         case V4L2_CID_BRIGHTNESS:
 839                 return stk_sensor_set_brightness(dev, ctrl->val);
 840         case V4L2_CID_HFLIP:
 841                 if (dmi_check_system(stk_upside_down_dmi_table))
 842                         dev->vsettings.hflip = !ctrl->val;
 843                 else
 844                         dev->vsettings.hflip = ctrl->val;
 845                 return 0;
 846         case V4L2_CID_VFLIP:
 847                 if (dmi_check_system(stk_upside_down_dmi_table))
 848                         dev->vsettings.vflip = !ctrl->val;
 849                 else
 850                         dev->vsettings.vflip = ctrl->val;
 851                 return 0;
 852         default:
 853                 return -EINVAL;
 854         }
 855         return 0;
 856 }
 857
 858
 859 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
 860                 void *priv, struct v4l2_fmtdesc *fmtd)
 861 {
 862         switch (fmtd->index) {
 863         case 0:
 864                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 865                 strcpy(fmtd->description, "r5g6b5");
 866                 break;
 867         case 1:
 868                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 869                 strcpy(fmtd->description, "r5g6b5BE");
 870                 break;
 871         case 2:
 872                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 873                 strcpy(fmtd->description, "yuv4:2:2");
 874                 break;
 875         case 3:
 876                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 877                 strcpy(fmtd->description, "Raw bayer");
 878                 break;
 879         case 4:
 880                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 881                 strcpy(fmtd->description, "yuv4:2:2");
 882                 break;
 883         default:
 884                 return -EINVAL;
 885         }
 886         return 0;
 887 }
 888
 889 static struct stk_size {
 890         unsigned w;
 891         unsigned h;
 892         enum stk_mode m;
 893 } stk_sizes[] = {
 894         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
 895         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
 896         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
 897         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
 898         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
 899 };
 900
 901 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 902                 void *priv, struct v4l2_format *f)
 903 {
 904         struct v4l2_pix_format *pix_format = &f->fmt.pix;
 905         struct stk_camera *dev = video_drvdata(filp);
 906         int i;
 907
 908         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
 909                         stk_sizes[i].m != dev->vsettings.mode; i++)
 910                 ;
 911         if (i == ARRAY_SIZE(stk_sizes)) {
 912                 pr_err("ERROR: mode invalid\n");
 913                 return -EINVAL;
 914         }
 915         pix_format->width = stk_sizes[i].w;
 916         pix_format->height = stk_sizes[i].h;
 917         pix_format->field = V4L2_FIELD_NONE;
 918         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
 919         pix_format->pixelformat = dev->vsettings.palette;
 920         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 921                 pix_format->bytesperline = pix_format->width;
 922         else
 923                 pix_format->bytesperline = 2 * pix_format->width;
 924         pix_format->sizeimage = pix_format->bytesperline
 925                                 * pix_format->height;
 926         return 0;
 927 }
 928
 929 static int stk_try_fmt_vid_cap(struct file *filp,
 930                 struct v4l2_format *fmtd, int *idx)
 931 {
 932         int i;
 933         switch (fmtd->fmt.pix.pixelformat) {
 934         case V4L2_PIX_FMT_RGB565:
 935         case V4L2_PIX_FMT_RGB565X:
 936         case V4L2_PIX_FMT_UYVY:
 937         case V4L2_PIX_FMT_YUYV:
 938         case V4L2_PIX_FMT_SBGGR8:
 939                 break;
 940         default:
 941                 return -EINVAL;
 942         }
 943         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
 944                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
 945                         break;
 946         }
 947         if (i == ARRAY_SIZE(stk_sizes)
 948                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
 949                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 950                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
 951                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
 952                 if (idx)
 953                         *idx = i - 1;
 954         } else {
 955                 fmtd->fmt.pix.height = stk_sizes[i].h;
 956                 fmtd->fmt.pix.width = stk_sizes[i].w;
 957                 if (idx)
 958                         *idx = i;
 959         }
 960
 961         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
 962         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 963         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
 964                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
 965         else
 966                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 967         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 968                 * fmtd->fmt.pix.height;
 969         return 0;
 970 }
 971
 972 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 973                 void *priv, struct v4l2_format *fmtd)
 974 {
 975         return stk_try_fmt_vid_cap(filp, fmtd, NULL);
 976 }
 977
 978 static int stk_setup_format(struct stk_camera *dev)
 979 {
 980         int i = 0;
 981         int depth;
 982         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 983                 depth = 1;
 984         else
 985                 depth = 2;
 986         while (i < ARRAY_SIZE(stk_sizes) &&
 987                         stk_sizes[i].m != dev->vsettings.mode)
 988                 i++;
 989         if (i == ARRAY_SIZE(stk_sizes)) {
 990                 pr_err("Something is broken in %s\n", __func__);
 991                 return -EFAULT;
 992         }
 993         /* This registers controls some timings, not sure of what. */
 994         stk_camera_write_reg(dev, 0x001b, 0x0e);
 995         if (dev->vsettings.mode == MODE_SXGA)
 996                 stk_camera_write_reg(dev, 0x001c, 0x0e);
 997         else
 998                 stk_camera_write_reg(dev, 0x001c, 0x46);
 999         /*
1000          * Registers 0x0115 0x0114 are the size of each line (bytes),
1001          * regs 0x0117 0x0116 are the heigth of the image.
1002          */
1003         stk_camera_write_reg(dev, 0x0115,
1004                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
1005         stk_camera_write_reg(dev, 0x0114,
1006                 (stk_sizes[i].w * depth) & 0xff);
1007         stk_camera_write_reg(dev, 0x0117,
1008                 (stk_sizes[i].h >> 8) & 0xff);
1009         stk_camera_write_reg(dev, 0x0116,
1010                 stk_sizes[i].h & 0xff);
1011         return stk_sensor_configure(dev);
1012 }
1013
1014 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
1015                 void *priv, struct v4l2_format *fmtd)
1016 {
1017         int ret;
1018         int idx;
1019         struct stk_camera *dev = video_drvdata(filp);
1020
1021         if (dev == NULL)
1022                 return -ENODEV;
1023         if (!is_present(dev))
1024                 return -ENODEV;
1025         if (is_streaming(dev))
1026                 return -EBUSY;
1027         if (dev->owner)
1028                 return -EBUSY;
1029         ret = stk_try_fmt_vid_cap(filp, fmtd, &idx);
1030         if (ret)
1031                 return ret;
1032
1033         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1034         stk_free_buffers(dev);
1035         dev->frame_size = fmtd->fmt.pix.sizeimage;
1036         dev->vsettings.mode = stk_sizes[idx].m;
1037
1038         stk_initialise(dev);
1039         return stk_setup_format(dev);
1040 }
1041
1042 static int stk_vidioc_reqbufs(struct file *filp,
1043                 void *priv, struct v4l2_requestbuffers *rb)
1044 {
1045         struct stk_camera *dev = video_drvdata(filp);
1046
1047         if (dev == NULL)
1048                 return -ENODEV;
1049         if (rb->memory != V4L2_MEMORY_MMAP)
1050                 return -EINVAL;
1051         if (is_streaming(dev)
1052                 || (dev->owner && dev->owner != filp))
1053                 return -EBUSY;
1054         stk_free_buffers(dev);
1055         if (rb->count == 0) {
1056                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
1057                 unset_initialised(dev);
1058                 dev->owner = NULL;
1059                 return 0;
1060         }
1061         dev->owner = filp;
1062
1063         /*FIXME If they ask for zero, we must stop streaming and free */
1064         if (rb->count < 3)
1065                 rb->count = 3;
1066         /* Arbitrary limit */
1067         else if (rb->count > 5)
1068                 rb->count = 5;
1069
1070         stk_allocate_buffers(dev, rb->count);
1071         rb->count = dev->n_sbufs;
1072         return 0;
1073 }
1074
1075 static int stk_vidioc_querybuf(struct file *filp,
1076                 void *priv, struct v4l2_buffer *buf)
1077 {
1078         struct stk_camera *dev = video_drvdata(filp);
1079         struct stk_sio_buffer *sbuf;
1080
1081         if (buf->index >= dev->n_sbufs)
1082                 return -EINVAL;
1083         sbuf = dev->sio_bufs + buf->index;
1084         *buf = sbuf->v4lbuf;
1085         return 0;
1086 }
1087
1088 static int stk_vidioc_qbuf(struct file *filp,
1089                 void *priv, struct v4l2_buffer *buf)
1090 {
1091         struct stk_camera *dev = video_drvdata(filp);
1092         struct stk_sio_buffer *sbuf;
1093         unsigned long flags;
1094
1095         if (buf->memory != V4L2_MEMORY_MMAP)
1096                 return -EINVAL;
1097
1098         if (buf->index >= dev->n_sbufs)
1099                 return -EINVAL;
1100         sbuf = dev->sio_bufs + buf->index;
1101         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1102                 return 0;
1103         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1104         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1105         spin_lock_irqsave(&dev->spinlock, flags);
1106         list_add_tail(&sbuf->list, &dev->sio_avail);
1107         *buf = sbuf->v4lbuf;
1108         spin_unlock_irqrestore(&dev->spinlock, flags);
1109         return 0;
1110 }
1111
1112 static int stk_vidioc_dqbuf(struct file *filp,
1113                 void *priv, struct v4l2_buffer *buf)
1114 {
1115         struct stk_camera *dev = video_drvdata(filp);
1116         struct stk_sio_buffer *sbuf;
1117         unsigned long flags;
1118         int ret;
1119
1120         if (!is_streaming(dev))
1121                 return -EINVAL;
1122
1123         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1124                 return -EWOULDBLOCK;
1125         ret = wait_event_interruptible(dev->wait_frame,
1126                 !list_empty(&dev->sio_full) || !is_present(dev));
1127         if (ret)
1128                 return ret;
1129         if (!is_present(dev))
1130                 return -EIO;
1131
1132         spin_lock_irqsave(&dev->spinlock, flags);
1133         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1134         list_del_init(&sbuf->list);
1135         spin_unlock_irqrestore(&dev->spinlock, flags);
1136         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1137         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1138         sbuf->v4lbuf.sequence = ++dev->sequence;
1139         v4l2_get_timestamp(&sbuf->v4lbuf.timestamp);
1140
1141         *buf = sbuf->v4lbuf;
1142         return 0;
1143 }
1144
1145 static int stk_vidioc_streamon(struct file *filp,
1146                 void *priv, enum v4l2_buf_type type)
1147 {
1148         struct stk_camera *dev = video_drvdata(filp);
1149         if (is_streaming(dev))
1150                 return 0;
1151         if (dev->sio_bufs == NULL)
1152                 return -EINVAL;
1153         dev->sequence = 0;
1154         return stk_start_stream(dev);
1155 }
1156
1157 static int stk_vidioc_streamoff(struct file *filp,
1158                 void *priv, enum v4l2_buf_type type)
1159 {
1160         struct stk_camera *dev = video_drvdata(filp);
1161         unsigned long flags;
1162         int i;
1163         stk_stop_stream(dev);
1164         spin_lock_irqsave(&dev->spinlock, flags);
1165         INIT_LIST_HEAD(&dev->sio_avail);
1166         INIT_LIST_HEAD(&dev->sio_full);
1167         for (i = 0; i < dev->n_sbufs; i++) {
1168                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1169                 dev->sio_bufs[i].v4lbuf.flags = 0;
1170         }
1171         spin_unlock_irqrestore(&dev->spinlock, flags);
1172         return 0;
1173 }
1174
1175
1176 static int stk_vidioc_g_parm(struct file *filp,
1177                 void *priv, struct v4l2_streamparm *sp)
1178 {
1179         /*FIXME This is not correct */
1180         sp->parm.capture.timeperframe.numerator = 1;
1181         sp->parm.capture.timeperframe.denominator = 30;
1182         sp->parm.capture.readbuffers = 2;
1183         return 0;
1184 }
1185
1186 static int stk_vidioc_enum_framesizes(struct file *filp,
1187                 void *priv, struct v4l2_frmsizeenum *frms)
1188 {
1189         if (frms->index >= ARRAY_SIZE(stk_sizes))
1190                 return -EINVAL;
1191         switch (frms->pixel_format) {
1192         case V4L2_PIX_FMT_RGB565:
1193         case V4L2_PIX_FMT_RGB565X:
1194         case V4L2_PIX_FMT_UYVY:
1195         case V4L2_PIX_FMT_YUYV:
1196         case V4L2_PIX_FMT_SBGGR8:
1197                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1198                 frms->discrete.width = stk_sizes[frms->index].w;
1199                 frms->discrete.height = stk_sizes[frms->index].h;
1200                 return 0;
1201         default: return -EINVAL;
1202         }
1203 }
1204
1205 static const struct v4l2_ctrl_ops stk_ctrl_ops = {
1206         .s_ctrl = stk_s_ctrl,
1207 };
1208
1209 static const struct v4l2_file_operations v4l_stk_fops = {
1210         .owner = THIS_MODULE,
1211         .open = v4l_stk_open,
1212         .release = v4l_stk_release,
1213         .read = v4l_stk_read,
1214         .poll = v4l_stk_poll,
1215         .mmap = v4l_stk_mmap,
1216         .unlocked_ioctl = video_ioctl2,
1217 };
1218
1219 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1220         .vidioc_querycap = stk_vidioc_querycap,
1221         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1222         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1223         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1224         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1225         .vidioc_enum_input = stk_vidioc_enum_input,
1226         .vidioc_s_input = stk_vidioc_s_input,
1227         .vidioc_g_input = stk_vidioc_g_input,
1228         .vidioc_reqbufs = stk_vidioc_reqbufs,
1229         .vidioc_querybuf = stk_vidioc_querybuf,
1230         .vidioc_qbuf = stk_vidioc_qbuf,
1231         .vidioc_dqbuf = stk_vidioc_dqbuf,
1232         .vidioc_streamon = stk_vidioc_streamon,
1233         .vidioc_streamoff = stk_vidioc_streamoff,
1234         .vidioc_g_parm = stk_vidioc_g_parm,
1235         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1236         .vidioc_log_status = v4l2_ctrl_log_status,
1237         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1238         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1239 };
1240
1241 static void stk_v4l_dev_release(struct video_device *vd)
1242 {
1243         struct stk_camera *dev = vdev_to_camera(vd);
1244
1245         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1246                 pr_err("We are leaking memory\n");
1247         usb_put_intf(dev->interface);
1248 }
1249
1250 static const struct video_device stk_v4l_data = {
1251         .name = "stkwebcam",
1252         .fops = &v4l_stk_fops,
1253         .ioctl_ops = &v4l_stk_ioctl_ops,
1254         .release = stk_v4l_dev_release,
1255 };
1256
1257
1258 static int stk_register_video_device(struct stk_camera *dev)
1259 {
1260         int err;
1261
1262         dev->vdev = stk_v4l_data;
1263         dev->vdev.lock = &dev->lock;
1264         dev->vdev.v4l2_dev = &dev->v4l2_dev;
1265         video_set_drvdata(&dev->vdev, dev);
1266         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1267         if (err)
1268                 pr_err("v4l registration failed\n");
1269         else
1270                 pr_info("Syntek USB2.0 Camera is now controlling device %s\n",
1271                         video_device_node_name(&dev->vdev));
1272         return err;
1273 }
1274
1275
1276 /* USB Stuff */
1277
1278 static int stk_camera_probe(struct usb_interface *interface,
1279                 const struct usb_device_id *id)
1280 {
1281         struct v4l2_ctrl_handler *hdl;
1282         int err = 0;
1283         int i;
1284
1285         struct stk_camera *dev = NULL;
1286         struct usb_device *udev = interface_to_usbdev(interface);
1287         struct usb_host_interface *iface_desc;
1288         struct usb_endpoint_descriptor *endpoint;
1289
1290         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1291         if (dev == NULL) {
1292                 pr_err("Out of memory !\n");
1293                 return -ENOMEM;
1294         }
1295         err = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
1296         if (err < 0) {
1297                 dev_err(&udev->dev, "couldn't register v4l2_device\n");
1298                 kfree(dev);
1299                 return err;
1300         }
1301         hdl = &dev->hdl;
1302         v4l2_ctrl_handler_init(hdl, 3);
1303         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1304                           V4L2_CID_BRIGHTNESS, 0, 0xff, 0x1, 0x60);
1305         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1306                           V4L2_CID_HFLIP, 0, 1, 1, 1);
1307         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1308                           V4L2_CID_VFLIP, 0, 1, 1, 1);
1309         if (hdl->error) {
1310                 err = hdl->error;
1311                 dev_err(&udev->dev, "couldn't register control\n");
1312                 goto error;
1313         }
1314         dev->v4l2_dev.ctrl_handler = hdl;
1315
1316         spin_lock_init(&dev->spinlock);
1317         mutex_init(&dev->lock);
1318         init_waitqueue_head(&dev->wait_frame);
1319         dev->first_init = 1; /* webcam LED management */
1320
1321         dev->udev = udev;
1322         dev->interface = interface;
1323         usb_get_intf(interface);
1324
1325         if (hflip != -1)
1326                 dev->vsettings.hflip = hflip;
1327         else if (dmi_check_system(stk_upside_down_dmi_table))
1328                 dev->vsettings.hflip = 1;
1329         else
1330                 dev->vsettings.hflip = 0;
1331         if (vflip != -1)
1332                 dev->vsettings.vflip = vflip;
1333         else if (dmi_check_system(stk_upside_down_dmi_table))
1334                 dev->vsettings.vflip = 1;
1335         else
1336                 dev->vsettings.vflip = 0;
1337         dev->n_sbufs = 0;
1338         set_present(dev);
1339
1340         /* Set up the endpoint information
1341          * use only the first isoc-in endpoint
1342          * for the current alternate setting */
1343         iface_desc = interface->cur_altsetting;
1344
1345         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1346                 endpoint = &iface_desc->endpoint[i].desc;
1347
1348                 if (!dev->isoc_ep
1349                         && usb_endpoint_is_isoc_in(endpoint)) {
1350                         /* we found an isoc in endpoint */
1351                         dev->isoc_ep = usb_endpoint_num(endpoint);
1352                         break;
1353                 }
1354         }
1355         if (!dev->isoc_ep) {
1356                 pr_err("Could not find isoc-in endpoint\n");
1357                 err = -ENODEV;
1358                 goto error_put;
1359         }
1360         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1361         dev->vsettings.mode = MODE_VGA;
1362         dev->frame_size = 640 * 480 * 2;
1363
1364         INIT_LIST_HEAD(&dev->sio_avail);
1365         INIT_LIST_HEAD(&dev->sio_full);
1366
1367         usb_set_intfdata(interface, dev);
1368
1369         err = stk_register_video_device(dev);
1370         if (err)
1371                 goto error_put;
1372
1373         return 0;
1374
1375 error_put:
1376         usb_put_intf(interface);
1377 error:
1378         v4l2_ctrl_handler_free(hdl);
1379         v4l2_device_unregister(&dev->v4l2_dev);
1380         kfree(dev);
1381         return err;
1382 }
1383
1384 static void stk_camera_disconnect(struct usb_interface *interface)
1385 {
1386         struct stk_camera *dev = usb_get_intfdata(interface);
1387
1388         usb_set_intfdata(interface, NULL);
1389         unset_present(dev);
1390
1391         wake_up_interruptible(&dev->wait_frame);
1392
1393         pr_info("Syntek USB2.0 Camera release resources device %s\n",
1394                 video_device_node_name(&dev->vdev));
1395
1396         video_unregister_device(&dev->vdev);
1397         v4l2_ctrl_handler_free(&dev->hdl);
1398         v4l2_device_unregister(&dev->v4l2_dev);
1399         kfree(dev);
1400 }
1401
1402 #ifdef CONFIG_PM
1403 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1404 {
1405         struct stk_camera *dev = usb_get_intfdata(intf);
1406         if (is_streaming(dev)) {
1407                 stk_stop_stream(dev);
1408                 /* yes, this is ugly */
1409                 set_streaming(dev);
1410         }
1411         return 0;
1412 }
1413
1414 static int stk_camera_resume(struct usb_interface *intf)
1415 {
1416         struct stk_camera *dev = usb_get_intfdata(intf);
1417         if (!is_initialised(dev))
1418                 return 0;
1419         unset_initialised(dev);
1420         stk_initialise(dev);
1421         stk_camera_write_reg(dev, 0x0, 0x49);
1422         stk_setup_format(dev);
1423         if (is_streaming(dev))
1424                 stk_start_stream(dev);
1425         return 0;
1426 }
1427 #endif
1428
1429 static struct usb_driver stk_camera_driver = {
1430         .name = "stkwebcam",
1431         .probe = stk_camera_probe,
1432         .disconnect = stk_camera_disconnect,
1433         .id_table = stkwebcam_table,
1434 #ifdef CONFIG_PM
1435         .suspend = stk_camera_suspend,
1436         .resume = stk_camera_resume,
1437 #endif
1438 };
1439
1440 module_usb_driver(stk_camera_driver);