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

   1 /*
   2  * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
   3  *
   4  * Copyright (C) 2006 Nicolas VIVIEN
   5  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
   6  *
   7  * Some parts are inspired from cafe_ccic.c
   8  * Copyright 2006-2007 Jonathan Corbet
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30
  31 #include <linux/dmi.h>
  32 #include <linux/usb.h>
  33 #include <linux/mm.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/videodev2.h>
  36 #include <media/v4l2-common.h>
  37 #include <media/v4l2-ioctl.h>
  38 #include <media/v4l2-event.h>
  39
  40 #include "stk-webcam.h"
  41
  42
  43 static int hflip = -1;
  44 module_param(hflip, int, 0444);
  45 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 0");
  46
  47 static int vflip = -1;
  48 module_param(vflip, int, 0444);
  49 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 0");
  50
  51 static int debug;
  52 module_param(debug, int, 0444);
  53 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
  54
  55 MODULE_LICENSE("GPL");
  56 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
  57 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
  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  * The stk webcam laptop module is mounted upside down in some laptops :(
  69  *
  70  * Some background information (thanks to Hans de Goede for providing this):
  71  *
  72  * 1) Once upon a time the stkwebcam driver was written
  73  *
  74  * 2) The webcam in question was used mostly in Asus laptop models, including
  75  * the laptop of the original author of the driver, and in these models, in
  76  * typical Asus fashion (see the long long list for uvc cams inside v4l-utils),
  77  * they mounted the webcam-module the wrong way up. So the hflip and vflip
  78  * module options were given a default value of 1 (the correct value for
  79  * upside down mounted models)
  80  *
  81  * 3) Years later I got a bug report from a user with a laptop with stkwebcam,
  82  * where the module was actually mounted the right way up, and thus showed
  83  * upside down under Linux. So now I was facing the choice of 2 options:
  84  *
  85  * a) Add a not-upside-down list to stkwebcam, which overrules the default.
  86  *
  87  * b) Do it like all the other drivers do, and make the default right for
  88  *    cams mounted the proper way and add an upside-down model list, with
  89  *    models where we need to flip-by-default.
  90  *
  91  * Despite knowing that going b) would cause a period of pain where we were
  92  * building the table I opted to go for option b), since a) is just too ugly,
  93  * and worse different from how every other driver does it leading to
  94  * confusion in the long run. This change was made in kernel 3.6.
  95  *
  96  * So for any user report about upside-down images since kernel 3.6 ask them
  97  * to provide the output of 'sudo dmidecode' so the laptop can be added in
  98  * the table below.
  99  */
 100 static const struct dmi_system_id stk_upside_down_dmi_table[] = {
 101         {
 102                 .ident = "ASUS G1",
 103                 .matches = {
 104                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 105                         DMI_MATCH(DMI_PRODUCT_NAME, "G1")
 106                 }
 107         }, {
 108                 .ident = "ASUS F3JC",
 109                 .matches = {
 110                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 111                         DMI_MATCH(DMI_PRODUCT_NAME, "F3JC")
 112                 }
 113         },
 114         {
 115                 .ident = "T12Rg-H",
 116                 .matches = {
 117                         DMI_MATCH(DMI_SYS_VENDOR, "HCL Infosystems Limited"),
 118                         DMI_MATCH(DMI_PRODUCT_NAME, "T12Rg-H")
 119                 }
 120         },
 121         {}
 122 };
 123
 124
 125 /*
 126  * Basic stuff
 127  */
 128 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
 129 {
 130         struct usb_device *udev = dev->udev;
 131         int ret;
 132
 133         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 134                         0x01,
 135                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 136                         value,
 137                         index,
 138                         NULL,
 139                         0,
 140                         500);
 141         if (ret < 0)
 142                 return ret;
 143         else
 144                 return 0;
 145 }
 146
 147 int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value)
 148 {
 149         struct usb_device *udev = dev->udev;
 150         unsigned char *buf;
 151         int ret;
 152
 153         buf = kmalloc(sizeof(u8), GFP_KERNEL);
 154         if (!buf)
 155                 return -ENOMEM;
 156
 157         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 158                         0x00,
 159                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 160                         0x00,
 161                         index,
 162                         buf,
 163                         sizeof(u8),
 164                         500);
 165         if (ret >= 0)
 166                 *value = *buf;
 167
 168         kfree(buf);
 169         return ret;
 170 }
 171
 172 static int stk_start_stream(struct stk_camera *dev)
 173 {
 174         u8 value;
 175         int i, ret;
 176         u8 value_116, value_117;
 177
 178
 179         if (!is_present(dev))
 180                 return -ENODEV;
 181         if (!is_memallocd(dev) || !is_initialised(dev)) {
 182                 STK_ERROR("FIXME: Buffers are not allocated\n");
 183                 return -EFAULT;
 184         }
 185         ret = usb_set_interface(dev->udev, 0, 5);
 186
 187         if (ret < 0)
 188                 STK_ERROR("usb_set_interface failed !\n");
 189         if (stk_sensor_wakeup(dev))
 190                 STK_ERROR("error awaking the sensor\n");
 191
 192         stk_camera_read_reg(dev, 0x0116, &value_116);
 193         stk_camera_read_reg(dev, 0x0117, &value_117);
 194
 195         stk_camera_write_reg(dev, 0x0116, 0x0000);
 196         stk_camera_write_reg(dev, 0x0117, 0x0000);
 197
 198         stk_camera_read_reg(dev, 0x0100, &value);
 199         stk_camera_write_reg(dev, 0x0100, value | 0x80);
 200
 201         stk_camera_write_reg(dev, 0x0116, value_116);
 202         stk_camera_write_reg(dev, 0x0117, value_117);
 203         for (i = 0; i < MAX_ISO_BUFS; i++) {
 204                 if (dev->isobufs[i].urb) {
 205                         ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
 206                         atomic_inc(&dev->urbs_used);
 207                         if (ret)
 208                                 return ret;
 209                 }
 210         }
 211         set_streaming(dev);
 212         return 0;
 213 }
 214
 215 static int stk_stop_stream(struct stk_camera *dev)
 216 {
 217         u8 value;
 218         int i;
 219         if (is_present(dev)) {
 220                 stk_camera_read_reg(dev, 0x0100, &value);
 221                 stk_camera_write_reg(dev, 0x0100, value & ~0x80);
 222                 if (dev->isobufs != NULL) {
 223                         for (i = 0; i < MAX_ISO_BUFS; i++) {
 224                                 if (dev->isobufs[i].urb)
 225                                         usb_kill_urb(dev->isobufs[i].urb);
 226                         }
 227                 }
 228                 unset_streaming(dev);
 229
 230                 if (usb_set_interface(dev->udev, 0, 0))
 231                         STK_ERROR("usb_set_interface failed !\n");
 232                 if (stk_sensor_sleep(dev))
 233                         STK_ERROR("error suspending the sensor\n");
 234         }
 235         return 0;
 236 }
 237
 238 /*
 239  * This seems to be the shortest init sequence we
 240  * must do in order to find the sensor
 241  * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 242  * is also reset. Maybe powers down it?
 243  * Rest of values don't make a difference
 244  */
 245
 246 static struct regval stk1125_initvals[] = {
 247         /*TODO: What means this sequence? */
 248         {0x0000, 0x24},
 249         {0x0100, 0x21},
 250         {0x0002, 0x68},
 251         {0x0003, 0x80},
 252         {0x0005, 0x00},
 253         {0x0007, 0x03},
 254         {0x000d, 0x00},
 255         {0x000f, 0x02},
 256         {0x0300, 0x12},
 257         {0x0350, 0x41},
 258         {0x0351, 0x00},
 259         {0x0352, 0x00},
 260         {0x0353, 0x00},
 261         {0x0018, 0x10},
 262         {0x0019, 0x00},
 263         {0x001b, 0x0e},
 264         {0x001c, 0x46},
 265         {0x0300, 0x80},
 266         {0x001a, 0x04},
 267         {0x0110, 0x00},
 268         {0x0111, 0x00},
 269         {0x0112, 0x00},
 270         {0x0113, 0x00},
 271
 272         {0xffff, 0xff},
 273 };
 274
 275
 276 static int stk_initialise(struct stk_camera *dev)
 277 {
 278         struct regval *rv;
 279         int ret;
 280         if (!is_present(dev))
 281                 return -ENODEV;
 282         if (is_initialised(dev))
 283                 return 0;
 284         rv = stk1125_initvals;
 285         while (rv->reg != 0xffff) {
 286                 ret = stk_camera_write_reg(dev, rv->reg, rv->val);
 287                 if (ret)
 288                         return ret;
 289                 rv++;
 290         }
 291         if (stk_sensor_init(dev) == 0) {
 292                 set_initialised(dev);
 293                 return 0;
 294         } else
 295                 return -1;
 296 }
 297
 298 /* *********************************************** */
 299 /*
 300  * This function is called as an URB transfert is complete (Isochronous pipe).
 301  * So, the traitement is done in interrupt time, so it has be fast, not crash,
 302  * and not stall. Neat.
 303  */
 304 static void stk_isoc_handler(struct urb *urb)
 305 {
 306         int i;
 307         int ret;
 308         int framelen;
 309         unsigned long flags;
 310
 311         unsigned char *fill = NULL;
 312         unsigned char *iso_buf = NULL;
 313
 314         struct stk_camera *dev;
 315         struct stk_sio_buffer *fb;
 316
 317         dev = (struct stk_camera *) urb->context;
 318
 319         if (dev == NULL) {
 320                 STK_ERROR("isoc_handler called with NULL device !\n");
 321                 return;
 322         }
 323
 324         if (urb->status == -ENOENT || urb->status == -ECONNRESET
 325                 || urb->status == -ESHUTDOWN) {
 326                 atomic_dec(&dev->urbs_used);
 327                 return;
 328         }
 329
 330         spin_lock_irqsave(&dev->spinlock, flags);
 331
 332         if (urb->status != -EINPROGRESS && urb->status != 0) {
 333                 STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
 334                 goto resubmit;
 335         }
 336
 337         if (list_empty(&dev->sio_avail)) {
 338                 /*FIXME Stop streaming after a while */
 339                 (void) (printk_ratelimit() &&
 340                 STK_ERROR("isoc_handler without available buffer!\n"));
 341                 goto resubmit;
 342         }
 343         fb = list_first_entry(&dev->sio_avail,
 344                         struct stk_sio_buffer, list);
 345         fill = fb->buffer + fb->v4lbuf.bytesused;
 346
 347         for (i = 0; i < urb->number_of_packets; i++) {
 348                 if (urb->iso_frame_desc[i].status != 0) {
 349                         if (urb->iso_frame_desc[i].status != -EXDEV)
 350                                 STK_ERROR("Frame %d has error %d\n", i,
 351                                         urb->iso_frame_desc[i].status);
 352                         continue;
 353                 }
 354                 framelen = urb->iso_frame_desc[i].actual_length;
 355                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 356
 357                 if (framelen <= 4)
 358                         continue; /* no data */
 359
 360                 /*
 361                  * we found something informational from there
 362                  * the isoc frames have to type of headers
 363                  * type1: 00 xx 00 00 or 20 xx 00 00
 364                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 365                  * xx is a sequencer which has never been seen over 0x3f
 366                  * imho data written down looks like bayer, i see similarities
 367                  * after every 640 bytes
 368                  */
 369                 if (*iso_buf & 0x80) {
 370                         framelen -= 8;
 371                         iso_buf += 8;
 372                         /* This marks a new frame */
 373                         if (fb->v4lbuf.bytesused != 0
 374                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 375                                 (void) (printk_ratelimit() &&
 376                                 STK_ERROR("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                         (void) (printk_ratelimit() &&
 403                         STK_ERROR("Frame buffer overflow, lost sync\n"));
 404                         /*FIXME Do something here? */
 405                         continue;
 406                 }
 407                 spin_unlock_irqrestore(&dev->spinlock, flags);
 408                 memcpy(fill, iso_buf, framelen);
 409                 spin_lock_irqsave(&dev->spinlock, flags);
 410                 fill += framelen;
 411
 412                 /* New size of our buffer */
 413                 fb->v4lbuf.bytesused += framelen;
 414         }
 415
 416 resubmit:
 417         spin_unlock_irqrestore(&dev->spinlock, flags);
 418         urb->dev = dev->udev;
 419         ret = usb_submit_urb(urb, GFP_ATOMIC);
 420         if (ret != 0) {
 421                 STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
 422                         ret);
 423         }
 424 }
 425
 426 /* -------------------------------------------- */
 427
 428 static int stk_prepare_iso(struct stk_camera *dev)
 429 {
 430         void *kbuf;
 431         int i, j;
 432         struct urb *urb;
 433         struct usb_device *udev;
 434
 435         if (dev == NULL)
 436                 return -ENXIO;
 437         udev = dev->udev;
 438
 439         if (dev->isobufs)
 440                 STK_ERROR("isobufs already allocated. Bad\n");
 441         else
 442                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
 443                                        GFP_KERNEL);
 444         if (dev->isobufs == NULL) {
 445                 STK_ERROR("Unable to allocate iso buffers\n");
 446                 return -ENOMEM;
 447         }
 448         for (i = 0; i < MAX_ISO_BUFS; i++) {
 449                 if (dev->isobufs[i].data == NULL) {
 450                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 451                         if (kbuf == NULL) {
 452                                 STK_ERROR("Failed to allocate iso buffer %d\n",
 453                                         i);
 454                                 goto isobufs_out;
 455                         }
 456                         dev->isobufs[i].data = kbuf;
 457                 } else
 458                         STK_ERROR("isobuf data already allocated\n");
 459                 if (dev->isobufs[i].urb == NULL) {
 460                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 461                         if (urb == NULL)
 462                                 goto isobufs_out;
 463                         dev->isobufs[i].urb = urb;
 464                 } else {
 465                         STK_ERROR("Killing URB\n");
 466                         usb_kill_urb(dev->isobufs[i].urb);
 467                         urb = dev->isobufs[i].urb;
 468                 }
 469                 urb->interval = 1;
 470                 urb->dev = udev;
 471                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 472                 urb->transfer_flags = URB_ISO_ASAP;
 473                 urb->transfer_buffer = dev->isobufs[i].data;
 474                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 475                 urb->complete = stk_isoc_handler;
 476                 urb->context = dev;
 477                 urb->start_frame = 0;
 478                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 479
 480                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 481                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 482                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 483                 }
 484         }
 485         set_memallocd(dev);
 486         return 0;
 487
 488 isobufs_out:
 489         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 490                 kfree(dev->isobufs[i].data);
 491         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 492                 usb_free_urb(dev->isobufs[i].urb);
 493         kfree(dev->isobufs);
 494         dev->isobufs = NULL;
 495         return -ENOMEM;
 496 }
 497
 498 static void stk_clean_iso(struct stk_camera *dev)
 499 {
 500         int i;
 501
 502         if (dev == NULL || dev->isobufs == NULL)
 503                 return;
 504
 505         for (i = 0; i < MAX_ISO_BUFS; i++) {
 506                 struct urb *urb;
 507
 508                 urb = dev->isobufs[i].urb;
 509                 if (urb) {
 510                         if (atomic_read(&dev->urbs_used) && is_present(dev))
 511                                 usb_kill_urb(urb);
 512                         usb_free_urb(urb);
 513                 }
 514                 kfree(dev->isobufs[i].data);
 515         }
 516         kfree(dev->isobufs);
 517         dev->isobufs = NULL;
 518         unset_memallocd(dev);
 519 }
 520
 521 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 522 {
 523         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 524         INIT_LIST_HEAD(&buf->list);
 525         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 526         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 527         if (buf->buffer == NULL)
 528                 return -ENOMEM;
 529         buf->mapcount = 0;
 530         buf->dev = dev;
 531         buf->v4lbuf.index = index;
 532         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 533         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 534         buf->v4lbuf.field = V4L2_FIELD_NONE;
 535         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 536         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 537         return 0;
 538 }
 539
 540 static int stk_free_sio_buffers(struct stk_camera *dev)
 541 {
 542         int i;
 543         int nbufs;
 544         unsigned long flags;
 545         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 546                 return 0;
 547         /*
 548         * If any buffers are mapped, we cannot free them at all.
 549         */
 550         for (i = 0; i < dev->n_sbufs; i++) {
 551                 if (dev->sio_bufs[i].mapcount > 0)
 552                         return -EBUSY;
 553         }
 554         /*
 555         * OK, let's do it.
 556         */
 557         spin_lock_irqsave(&dev->spinlock, flags);
 558         INIT_LIST_HEAD(&dev->sio_avail);
 559         INIT_LIST_HEAD(&dev->sio_full);
 560         nbufs = dev->n_sbufs;
 561         dev->n_sbufs = 0;
 562         spin_unlock_irqrestore(&dev->spinlock, flags);
 563         for (i = 0; i < nbufs; i++)
 564                 vfree(dev->sio_bufs[i].buffer);
 565         kfree(dev->sio_bufs);
 566         dev->sio_bufs = NULL;
 567         return 0;
 568 }
 569
 570 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 571 {
 572         int i;
 573         if (dev->sio_bufs != NULL)
 574                 STK_ERROR("sio_bufs already allocated\n");
 575         else {
 576                 dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
 577                                 GFP_KERNEL);
 578                 if (dev->sio_bufs == NULL)
 579                         return -ENOMEM;
 580                 for (i = 0; i < n_sbufs; i++) {
 581                         if (stk_setup_siobuf(dev, i))
 582                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
 583                         dev->n_sbufs = i+1;
 584                 }
 585         }
 586         return 0;
 587 }
 588
 589 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 590 {
 591         int err;
 592         err = stk_prepare_iso(dev);
 593         if (err) {
 594                 stk_clean_iso(dev);
 595                 return err;
 596         }
 597         err = stk_prepare_sio_buffers(dev, n_sbufs);
 598         if (err) {
 599                 stk_free_sio_buffers(dev);
 600                 return err;
 601         }
 602         return 0;
 603 }
 604
 605 static void stk_free_buffers(struct stk_camera *dev)
 606 {
 607         stk_clean_iso(dev);
 608         stk_free_sio_buffers(dev);
 609 }
 610 /* -------------------------------------------- */
 611
 612 /* v4l file operations */
 613
 614 static int v4l_stk_open(struct file *fp)
 615 {
 616         struct stk_camera *dev = video_drvdata(fp);
 617         int err;
 618
 619         if (dev == NULL || !is_present(dev))
 620                 return -ENXIO;
 621
 622         if (mutex_lock_interruptible(&dev->lock))
 623                 return -ERESTARTSYS;
 624         if (!dev->first_init)
 625                 stk_camera_write_reg(dev, 0x0, 0x24);
 626         else
 627                 dev->first_init = 0;
 628
 629         err = v4l2_fh_open(fp);
 630         if (!err)
 631                 usb_autopm_get_interface(dev->interface);
 632         mutex_unlock(&dev->lock);
 633         return err;
 634 }
 635
 636 static int v4l_stk_release(struct file *fp)
 637 {
 638         struct stk_camera *dev = video_drvdata(fp);
 639
 640         mutex_lock(&dev->lock);
 641         if (dev->owner == fp) {
 642                 stk_stop_stream(dev);
 643                 stk_free_buffers(dev);
 644                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
 645                 unset_initialised(dev);
 646                 dev->owner = NULL;
 647         }
 648
 649         if (is_present(dev))
 650                 usb_autopm_put_interface(dev->interface);
 651         mutex_unlock(&dev->lock);
 652         return v4l2_fh_release(fp);
 653 }
 654
 655 static ssize_t stk_read(struct file *fp, char __user *buf,
 656                 size_t count, loff_t *f_pos)
 657 {
 658         int i;
 659         int ret;
 660         unsigned long flags;
 661         struct stk_sio_buffer *sbuf;
 662         struct stk_camera *dev = video_drvdata(fp);
 663
 664         if (!is_present(dev))
 665                 return -EIO;
 666         if (dev->owner && (!dev->reading || dev->owner != fp))
 667                 return -EBUSY;
 668         dev->owner = fp;
 669         if (!is_streaming(dev)) {
 670                 if (stk_initialise(dev)
 671                         || stk_allocate_buffers(dev, 3)
 672                         || stk_start_stream(dev))
 673                         return -ENOMEM;
 674                 dev->reading = 1;
 675                 spin_lock_irqsave(&dev->spinlock, flags);
 676                 for (i = 0; i < dev->n_sbufs; i++) {
 677                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 678                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 679                 }
 680                 spin_unlock_irqrestore(&dev->spinlock, flags);
 681         }
 682         if (*f_pos == 0) {
 683                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 684                         return -EWOULDBLOCK;
 685                 ret = wait_event_interruptible(dev->wait_frame,
 686                         !list_empty(&dev->sio_full) || !is_present(dev));
 687                 if (ret)
 688                         return ret;
 689                 if (!is_present(dev))
 690                         return -EIO;
 691         }
 692         if (count + *f_pos > dev->frame_size)
 693                 count = dev->frame_size - *f_pos;
 694         spin_lock_irqsave(&dev->spinlock, flags);
 695         if (list_empty(&dev->sio_full)) {
 696                 spin_unlock_irqrestore(&dev->spinlock, flags);
 697                 STK_ERROR("BUG: No siobufs ready\n");
 698                 return 0;
 699         }
 700         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 701         spin_unlock_irqrestore(&dev->spinlock, flags);
 702
 703         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 704                 return -EFAULT;
 705
 706         *f_pos += count;
 707
 708         if (*f_pos >= dev->frame_size) {
 709                 *f_pos = 0;
 710                 spin_lock_irqsave(&dev->spinlock, flags);
 711                 list_move_tail(&sbuf->list, &dev->sio_avail);
 712                 spin_unlock_irqrestore(&dev->spinlock, flags);
 713         }
 714         return count;
 715 }
 716
 717 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 718                 size_t count, loff_t *f_pos)
 719 {
 720         struct stk_camera *dev = video_drvdata(fp);
 721         int ret;
 722
 723         if (mutex_lock_interruptible(&dev->lock))
 724                 return -ERESTARTSYS;
 725         ret = stk_read(fp, buf, count, f_pos);
 726         mutex_unlock(&dev->lock);
 727         return ret;
 728 }
 729
 730 static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
 731 {
 732         struct stk_camera *dev = video_drvdata(fp);
 733         unsigned res = v4l2_ctrl_poll(fp, wait);
 734
 735         poll_wait(fp, &dev->wait_frame, wait);
 736
 737         if (!is_present(dev))
 738                 return POLLERR;
 739
 740         if (!list_empty(&dev->sio_full))
 741                 return res | POLLIN | POLLRDNORM;
 742
 743         return res;
 744 }
 745
 746
 747 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 748 {
 749         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 750         sbuf->mapcount++;
 751 }
 752 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 753 {
 754         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 755         sbuf->mapcount--;
 756         if (sbuf->mapcount == 0)
 757                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 758 }
 759 static const struct vm_operations_struct stk_v4l_vm_ops = {
 760         .open = stk_v4l_vm_open,
 761         .close = stk_v4l_vm_close
 762 };
 763
 764 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 765 {
 766         unsigned int i;
 767         int ret;
 768         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 769         struct stk_camera *dev = video_drvdata(fp);
 770         struct stk_sio_buffer *sbuf = NULL;
 771
 772         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 773                 return -EINVAL;
 774
 775         for (i = 0; i < dev->n_sbufs; i++) {
 776                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 777                         sbuf = dev->sio_bufs + i;
 778                         break;
 779                 }
 780         }
 781         if (sbuf == NULL)
 782                 return -EINVAL;
 783         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 784         if (ret)
 785                 return ret;
 786         vma->vm_flags |= VM_DONTEXPAND;
 787         vma->vm_private_data = sbuf;
 788         vma->vm_ops = &stk_v4l_vm_ops;
 789         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 790         stk_v4l_vm_open(vma);
 791         return 0;
 792 }
 793
 794 /* v4l ioctl handlers */
 795
 796 static int stk_vidioc_querycap(struct file *filp,
 797                 void *priv, struct v4l2_capability *cap)
 798 {
 799         struct stk_camera *dev = video_drvdata(filp);
 800
 801         strcpy(cap->driver, "stk");
 802         strcpy(cap->card, "stk");
 803         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 804
 805         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE
 806                 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
 807         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 808         return 0;
 809 }
 810
 811 static int stk_vidioc_enum_input(struct file *filp,
 812                 void *priv, struct v4l2_input *input)
 813 {
 814         if (input->index != 0)
 815                 return -EINVAL;
 816
 817         strcpy(input->name, "Syntek USB Camera");
 818         input->type = V4L2_INPUT_TYPE_CAMERA;
 819         return 0;
 820 }
 821
 822
 823 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 824 {
 825         *i = 0;
 826         return 0;
 827 }
 828
 829 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 830 {
 831         return i ? -EINVAL : 0;
 832 }
 833
 834 static int stk_s_ctrl(struct v4l2_ctrl *ctrl)
 835 {
 836         struct stk_camera *dev =
 837                 container_of(ctrl->handler, struct stk_camera, hdl);
 838
 839         switch (ctrl->id) {
 840         case V4L2_CID_BRIGHTNESS:
 841                 return stk_sensor_set_brightness(dev, ctrl->val);
 842         case V4L2_CID_HFLIP:
 843                 if (dmi_check_system(stk_upside_down_dmi_table))
 844                         dev->vsettings.hflip = !ctrl->val;
 845                 else
 846                         dev->vsettings.hflip = ctrl->val;
 847                 return 0;
 848         case V4L2_CID_VFLIP:
 849                 if (dmi_check_system(stk_upside_down_dmi_table))
 850                         dev->vsettings.vflip = !ctrl->val;
 851                 else
 852                         dev->vsettings.vflip = ctrl->val;
 853                 return 0;
 854         default:
 855                 return -EINVAL;
 856         }
 857         return 0;
 858 }
 859
 860
 861 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
 862                 void *priv, struct v4l2_fmtdesc *fmtd)
 863 {
 864         switch (fmtd->index) {
 865         case 0:
 866                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 867                 strcpy(fmtd->description, "r5g6b5");
 868                 break;
 869         case 1:
 870                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 871                 strcpy(fmtd->description, "r5g6b5BE");
 872                 break;
 873         case 2:
 874                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 875                 strcpy(fmtd->description, "yuv4:2:2");
 876                 break;
 877         case 3:
 878                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 879                 strcpy(fmtd->description, "Raw bayer");
 880                 break;
 881         case 4:
 882                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 883                 strcpy(fmtd->description, "yuv4:2:2");
 884                 break;
 885         default:
 886                 return -EINVAL;
 887         }
 888         return 0;
 889 }
 890
 891 static struct stk_size {
 892         unsigned w;
 893         unsigned h;
 894         enum stk_mode m;
 895 } stk_sizes[] = {
 896         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
 897         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
 898         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
 899         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
 900         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
 901 };
 902
 903 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 904                 void *priv, struct v4l2_format *f)
 905 {
 906         struct v4l2_pix_format *pix_format = &f->fmt.pix;
 907         struct stk_camera *dev = video_drvdata(filp);
 908         int i;
 909
 910         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
 911                         stk_sizes[i].m != dev->vsettings.mode; i++)
 912                 ;
 913         if (i == ARRAY_SIZE(stk_sizes)) {
 914                 STK_ERROR("ERROR: mode invalid\n");
 915                 return -EINVAL;
 916         }
 917         pix_format->width = stk_sizes[i].w;
 918         pix_format->height = stk_sizes[i].h;
 919         pix_format->field = V4L2_FIELD_NONE;
 920         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
 921         pix_format->pixelformat = dev->vsettings.palette;
 922         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 923                 pix_format->bytesperline = pix_format->width;
 924         else
 925                 pix_format->bytesperline = 2 * pix_format->width;
 926         pix_format->sizeimage = pix_format->bytesperline
 927                                 * pix_format->height;
 928         return 0;
 929 }
 930
 931 static int stk_try_fmt_vid_cap(struct file *filp,
 932                 struct v4l2_format *fmtd, int *idx)
 933 {
 934         int i;
 935         switch (fmtd->fmt.pix.pixelformat) {
 936         case V4L2_PIX_FMT_RGB565:
 937         case V4L2_PIX_FMT_RGB565X:
 938         case V4L2_PIX_FMT_UYVY:
 939         case V4L2_PIX_FMT_YUYV:
 940         case V4L2_PIX_FMT_SBGGR8:
 941                 break;
 942         default:
 943                 return -EINVAL;
 944         }
 945         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
 946                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
 947                         break;
 948         }
 949         if (i == ARRAY_SIZE(stk_sizes)
 950                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
 951                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 952                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
 953                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
 954                 if (idx)
 955                         *idx = i - 1;
 956         } else {
 957                 fmtd->fmt.pix.height = stk_sizes[i].h;
 958                 fmtd->fmt.pix.width = stk_sizes[i].w;
 959                 if (idx)
 960                         *idx = i;
 961         }
 962
 963         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
 964         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 965         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
 966                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
 967         else
 968                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 969         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 970                 * fmtd->fmt.pix.height;
 971         return 0;
 972 }
 973
 974 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 975                 void *priv, struct v4l2_format *fmtd)
 976 {
 977         return stk_try_fmt_vid_cap(filp, fmtd, NULL);
 978 }
 979
 980 static int stk_setup_format(struct stk_camera *dev)
 981 {
 982         int i = 0;
 983         int depth;
 984         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 985                 depth = 1;
 986         else
 987                 depth = 2;
 988         while (i < ARRAY_SIZE(stk_sizes) &&
 989                         stk_sizes[i].m != dev->vsettings.mode)
 990                 i++;
 991         if (i == ARRAY_SIZE(stk_sizes)) {
 992                 STK_ERROR("Something is broken in %s\n", __func__);
 993                 return -EFAULT;
 994         }
 995         /* This registers controls some timings, not sure of what. */
 996         stk_camera_write_reg(dev, 0x001b, 0x0e);
 997         if (dev->vsettings.mode == MODE_SXGA)
 998                 stk_camera_write_reg(dev, 0x001c, 0x0e);
 999         else
1000                 stk_camera_write_reg(dev, 0x001c, 0x46);
1001         /*
1002          * Registers 0x0115 0x0114 are the size of each line (bytes),
1003          * regs 0x0117 0x0116 are the heigth of the image.
1004          */
1005         stk_camera_write_reg(dev, 0x0115,
1006                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
1007         stk_camera_write_reg(dev, 0x0114,
1008                 (stk_sizes[i].w * depth) & 0xff);
1009         stk_camera_write_reg(dev, 0x0117,
1010                 (stk_sizes[i].h >> 8) & 0xff);
1011         stk_camera_write_reg(dev, 0x0116,
1012                 stk_sizes[i].h & 0xff);
1013         return stk_sensor_configure(dev);
1014 }
1015
1016 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
1017                 void *priv, struct v4l2_format *fmtd)
1018 {
1019         int ret;
1020         int idx;
1021         struct stk_camera *dev = video_drvdata(filp);
1022
1023         if (dev == NULL)
1024                 return -ENODEV;
1025         if (!is_present(dev))
1026                 return -ENODEV;
1027         if (is_streaming(dev))
1028                 return -EBUSY;
1029         if (dev->owner)
1030                 return -EBUSY;
1031         ret = stk_try_fmt_vid_cap(filp, fmtd, &idx);
1032         if (ret)
1033                 return ret;
1034
1035         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1036         stk_free_buffers(dev);
1037         dev->frame_size = fmtd->fmt.pix.sizeimage;
1038         dev->vsettings.mode = stk_sizes[idx].m;
1039
1040         stk_initialise(dev);
1041         return stk_setup_format(dev);
1042 }
1043
1044 static int stk_vidioc_reqbufs(struct file *filp,
1045                 void *priv, struct v4l2_requestbuffers *rb)
1046 {
1047         struct stk_camera *dev = video_drvdata(filp);
1048
1049         if (dev == NULL)
1050                 return -ENODEV;
1051         if (rb->memory != V4L2_MEMORY_MMAP)
1052                 return -EINVAL;
1053         if (is_streaming(dev)
1054                 || (dev->owner && dev->owner != filp))
1055                 return -EBUSY;
1056         stk_free_buffers(dev);
1057         if (rb->count == 0) {
1058                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
1059                 unset_initialised(dev);
1060                 dev->owner = NULL;
1061                 return 0;
1062         }
1063         dev->owner = filp;
1064
1065         /*FIXME If they ask for zero, we must stop streaming and free */
1066         if (rb->count < 3)
1067                 rb->count = 3;
1068         /* Arbitrary limit */
1069         else if (rb->count > 5)
1070                 rb->count = 5;
1071
1072         stk_allocate_buffers(dev, rb->count);
1073         rb->count = dev->n_sbufs;
1074         return 0;
1075 }
1076
1077 static int stk_vidioc_querybuf(struct file *filp,
1078                 void *priv, struct v4l2_buffer *buf)
1079 {
1080         struct stk_camera *dev = video_drvdata(filp);
1081         struct stk_sio_buffer *sbuf;
1082
1083         if (buf->index >= dev->n_sbufs)
1084                 return -EINVAL;
1085         sbuf = dev->sio_bufs + buf->index;
1086         *buf = sbuf->v4lbuf;
1087         return 0;
1088 }
1089
1090 static int stk_vidioc_qbuf(struct file *filp,
1091                 void *priv, struct v4l2_buffer *buf)
1092 {
1093         struct stk_camera *dev = video_drvdata(filp);
1094         struct stk_sio_buffer *sbuf;
1095         unsigned long flags;
1096
1097         if (buf->memory != V4L2_MEMORY_MMAP)
1098                 return -EINVAL;
1099
1100         if (buf->index >= dev->n_sbufs)
1101                 return -EINVAL;
1102         sbuf = dev->sio_bufs + buf->index;
1103         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1104                 return 0;
1105         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1106         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1107         spin_lock_irqsave(&dev->spinlock, flags);
1108         list_add_tail(&sbuf->list, &dev->sio_avail);
1109         *buf = sbuf->v4lbuf;
1110         spin_unlock_irqrestore(&dev->spinlock, flags);
1111         return 0;
1112 }
1113
1114 static int stk_vidioc_dqbuf(struct file *filp,
1115                 void *priv, struct v4l2_buffer *buf)
1116 {
1117         struct stk_camera *dev = video_drvdata(filp);
1118         struct stk_sio_buffer *sbuf;
1119         unsigned long flags;
1120         int ret;
1121
1122         if (!is_streaming(dev))
1123                 return -EINVAL;
1124
1125         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1126                 return -EWOULDBLOCK;
1127         ret = wait_event_interruptible(dev->wait_frame,
1128                 !list_empty(&dev->sio_full) || !is_present(dev));
1129         if (ret)
1130                 return ret;
1131         if (!is_present(dev))
1132                 return -EIO;
1133
1134         spin_lock_irqsave(&dev->spinlock, flags);
1135         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1136         list_del_init(&sbuf->list);
1137         spin_unlock_irqrestore(&dev->spinlock, flags);
1138         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1139         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1140         sbuf->v4lbuf.sequence = ++dev->sequence;
1141         v4l2_get_timestamp(&sbuf->v4lbuf.timestamp);
1142
1143         *buf = sbuf->v4lbuf;
1144         return 0;
1145 }
1146
1147 static int stk_vidioc_streamon(struct file *filp,
1148                 void *priv, enum v4l2_buf_type type)
1149 {
1150         struct stk_camera *dev = video_drvdata(filp);
1151         if (is_streaming(dev))
1152                 return 0;
1153         if (dev->sio_bufs == NULL)
1154                 return -EINVAL;
1155         dev->sequence = 0;
1156         return stk_start_stream(dev);
1157 }
1158
1159 static int stk_vidioc_streamoff(struct file *filp,
1160                 void *priv, enum v4l2_buf_type type)
1161 {
1162         struct stk_camera *dev = video_drvdata(filp);
1163         unsigned long flags;
1164         int i;
1165         stk_stop_stream(dev);
1166         spin_lock_irqsave(&dev->spinlock, flags);
1167         INIT_LIST_HEAD(&dev->sio_avail);
1168         INIT_LIST_HEAD(&dev->sio_full);
1169         for (i = 0; i < dev->n_sbufs; i++) {
1170                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1171                 dev->sio_bufs[i].v4lbuf.flags = 0;
1172         }
1173         spin_unlock_irqrestore(&dev->spinlock, flags);
1174         return 0;
1175 }
1176
1177
1178 static int stk_vidioc_g_parm(struct file *filp,
1179                 void *priv, struct v4l2_streamparm *sp)
1180 {
1181         /*FIXME This is not correct */
1182         sp->parm.capture.timeperframe.numerator = 1;
1183         sp->parm.capture.timeperframe.denominator = 30;
1184         sp->parm.capture.readbuffers = 2;
1185         return 0;
1186 }
1187
1188 static int stk_vidioc_enum_framesizes(struct file *filp,
1189                 void *priv, struct v4l2_frmsizeenum *frms)
1190 {
1191         if (frms->index >= ARRAY_SIZE(stk_sizes))
1192                 return -EINVAL;
1193         switch (frms->pixel_format) {
1194         case V4L2_PIX_FMT_RGB565:
1195         case V4L2_PIX_FMT_RGB565X:
1196         case V4L2_PIX_FMT_UYVY:
1197         case V4L2_PIX_FMT_YUYV:
1198         case V4L2_PIX_FMT_SBGGR8:
1199                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1200                 frms->discrete.width = stk_sizes[frms->index].w;
1201                 frms->discrete.height = stk_sizes[frms->index].h;
1202                 return 0;
1203         default: return -EINVAL;
1204         }
1205 }
1206
1207 static const struct v4l2_ctrl_ops stk_ctrl_ops = {
1208         .s_ctrl = stk_s_ctrl,
1209 };
1210
1211 static struct v4l2_file_operations v4l_stk_fops = {
1212         .owner = THIS_MODULE,
1213         .open = v4l_stk_open,
1214         .release = v4l_stk_release,
1215         .read = v4l_stk_read,
1216         .poll = v4l_stk_poll,
1217         .mmap = v4l_stk_mmap,
1218         .unlocked_ioctl = video_ioctl2,
1219 };
1220
1221 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1222         .vidioc_querycap = stk_vidioc_querycap,
1223         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1224         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1225         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1226         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1227         .vidioc_enum_input = stk_vidioc_enum_input,
1228         .vidioc_s_input = stk_vidioc_s_input,
1229         .vidioc_g_input = stk_vidioc_g_input,
1230         .vidioc_reqbufs = stk_vidioc_reqbufs,
1231         .vidioc_querybuf = stk_vidioc_querybuf,
1232         .vidioc_qbuf = stk_vidioc_qbuf,
1233         .vidioc_dqbuf = stk_vidioc_dqbuf,
1234         .vidioc_streamon = stk_vidioc_streamon,
1235         .vidioc_streamoff = stk_vidioc_streamoff,
1236         .vidioc_g_parm = stk_vidioc_g_parm,
1237         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1238         .vidioc_log_status = v4l2_ctrl_log_status,
1239         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1240         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1241 };
1242
1243 static void stk_v4l_dev_release(struct video_device *vd)
1244 {
1245         struct stk_camera *dev = vdev_to_camera(vd);
1246
1247         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1248                 STK_ERROR("We are leaking memory\n");
1249         usb_put_intf(dev->interface);
1250         kfree(dev);
1251 }
1252
1253 static struct video_device stk_v4l_data = {
1254         .name = "stkwebcam",
1255         .fops = &v4l_stk_fops,
1256         .ioctl_ops = &v4l_stk_ioctl_ops,
1257         .release = stk_v4l_dev_release,
1258 };
1259
1260
1261 static int stk_register_video_device(struct stk_camera *dev)
1262 {
1263         int err;
1264
1265         dev->vdev = stk_v4l_data;
1266         dev->vdev.lock = &dev->lock;
1267         dev->vdev.v4l2_dev = &dev->v4l2_dev;
1268         video_set_drvdata(&dev->vdev, dev);
1269         err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
1270         if (err)
1271                 STK_ERROR("v4l registration failed\n");
1272         else
1273                 STK_INFO("Syntek USB2.0 Camera is now controlling device %s\n",
1274                          video_device_node_name(&dev->vdev));
1275         return err;
1276 }
1277
1278
1279 /* USB Stuff */
1280
1281 static int stk_camera_probe(struct usb_interface *interface,
1282                 const struct usb_device_id *id)
1283 {
1284         struct v4l2_ctrl_handler *hdl;
1285         int err = 0;
1286         int i;
1287
1288         struct stk_camera *dev = NULL;
1289         struct usb_device *udev = interface_to_usbdev(interface);
1290         struct usb_host_interface *iface_desc;
1291         struct usb_endpoint_descriptor *endpoint;
1292
1293         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1294         if (dev == NULL) {
1295                 STK_ERROR("Out of memory !\n");
1296                 return -ENOMEM;
1297         }
1298         err = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
1299         if (err < 0) {
1300                 dev_err(&udev->dev, "couldn't register v4l2_device\n");
1301                 kfree(dev);
1302                 return err;
1303         }
1304         hdl = &dev->hdl;
1305         v4l2_ctrl_handler_init(hdl, 3);
1306         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1307                           V4L2_CID_BRIGHTNESS, 0, 0xff, 0x1, 0x60);
1308         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1309                           V4L2_CID_HFLIP, 0, 1, 1, 1);
1310         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1311                           V4L2_CID_VFLIP, 0, 1, 1, 1);
1312         if (hdl->error) {
1313                 err = hdl->error;
1314                 dev_err(&udev->dev, "couldn't register control\n");
1315                 goto error;
1316         }
1317         dev->v4l2_dev.ctrl_handler = hdl;
1318
1319         spin_lock_init(&dev->spinlock);
1320         mutex_init(&dev->lock);
1321         init_waitqueue_head(&dev->wait_frame);
1322         dev->first_init = 1; /* webcam LED management */
1323
1324         dev->udev = udev;
1325         dev->interface = interface;
1326         usb_get_intf(interface);
1327
1328         if (hflip != -1)
1329                 dev->vsettings.hflip = hflip;
1330         else if (dmi_check_system(stk_upside_down_dmi_table))
1331                 dev->vsettings.hflip = 1;
1332         else
1333                 dev->vsettings.hflip = 0;
1334         if (vflip != -1)
1335                 dev->vsettings.vflip = vflip;
1336         else if (dmi_check_system(stk_upside_down_dmi_table))
1337                 dev->vsettings.vflip = 1;
1338         else
1339                 dev->vsettings.vflip = 0;
1340         dev->n_sbufs = 0;
1341         set_present(dev);
1342
1343         /* Set up the endpoint information
1344          * use only the first isoc-in endpoint
1345          * for the current alternate setting */
1346         iface_desc = interface->cur_altsetting;
1347
1348         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1349                 endpoint = &iface_desc->endpoint[i].desc;
1350
1351                 if (!dev->isoc_ep
1352                         && usb_endpoint_is_isoc_in(endpoint)) {
1353                         /* we found an isoc in endpoint */
1354                         dev->isoc_ep = usb_endpoint_num(endpoint);
1355                         break;
1356                 }
1357         }
1358         if (!dev->isoc_ep) {
1359                 STK_ERROR("Could not find isoc-in endpoint");
1360                 err = -ENODEV;
1361                 goto error;
1362         }
1363         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1364         dev->vsettings.mode = MODE_VGA;
1365         dev->frame_size = 640 * 480 * 2;
1366
1367         INIT_LIST_HEAD(&dev->sio_avail);
1368         INIT_LIST_HEAD(&dev->sio_full);
1369
1370         usb_set_intfdata(interface, dev);
1371
1372         err = stk_register_video_device(dev);
1373         if (err)
1374                 goto error;
1375
1376         return 0;
1377
1378 error:
1379         v4l2_ctrl_handler_free(hdl);
1380         v4l2_device_unregister(&dev->v4l2_dev);
1381         kfree(dev);
1382         return err;
1383 }
1384
1385 static void stk_camera_disconnect(struct usb_interface *interface)
1386 {
1387         struct stk_camera *dev = usb_get_intfdata(interface);
1388
1389         usb_set_intfdata(interface, NULL);
1390         unset_present(dev);
1391
1392         wake_up_interruptible(&dev->wait_frame);
1393
1394         STK_INFO("Syntek USB2.0 Camera release resources device %s\n",
1395                  video_device_node_name(&dev->vdev));
1396
1397         video_unregister_device(&dev->vdev);
1398         v4l2_ctrl_handler_free(&dev->hdl);
1399         v4l2_device_unregister(&dev->v4l2_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);