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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
   4  *
   5  * Copyright (C) 2006 Nicolas VIVIEN
   6  * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
   7  *
   8  * Some parts are inspired from cafe_ccic.c
   9  * Copyright 2006-2007 Jonathan Corbet
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19
  20 #include <linux/dmi.h>
  21 #include <linux/usb.h>
  22 #include <linux/mm.h>
  23 #include <linux/vmalloc.h>
  24 #include <linux/videodev2.h>
  25 #include <media/v4l2-common.h>
  26 #include <media/v4l2-ioctl.h>
  27 #include <media/v4l2-event.h>
  28
  29 #include "stk-webcam.h"
  30
  31
  32 static int hflip = -1;
  33 module_param(hflip, int, 0444);
  34 MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 0");
  35
  36 static int vflip = -1;
  37 module_param(vflip, int, 0444);
  38 MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 0");
  39
  40 static int debug;
  41 module_param(debug, int, 0444);
  42 MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");
  43
  44 MODULE_LICENSE("GPL");
  45 MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
  46 MODULE_DESCRIPTION("Syntek DC1125 webcam driver");
  47
  48 /* Some cameras have audio interfaces, we aren't interested in those */
  49 static const struct usb_device_id stkwebcam_table[] = {
  50         { USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
  51         { USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
  52         { }
  53 };
  54 MODULE_DEVICE_TABLE(usb, stkwebcam_table);
  55
  56 /*
  57  * The stk webcam laptop module is mounted upside down in some laptops :(
  58  *
  59  * Some background information (thanks to Hans de Goede for providing this):
  60  *
  61  * 1) Once upon a time the stkwebcam driver was written
  62  *
  63  * 2) The webcam in question was used mostly in Asus laptop models, including
  64  * the laptop of the original author of the driver, and in these models, in
  65  * typical Asus fashion (see the long long list for uvc cams inside v4l-utils),
  66  * they mounted the webcam-module the wrong way up. So the hflip and vflip
  67  * module options were given a default value of 1 (the correct value for
  68  * upside down mounted models)
  69  *
  70  * 3) Years later I got a bug report from a user with a laptop with stkwebcam,
  71  * where the module was actually mounted the right way up, and thus showed
  72  * upside down under Linux. So now I was facing the choice of 2 options:
  73  *
  74  * a) Add a not-upside-down list to stkwebcam, which overrules the default.
  75  *
  76  * b) Do it like all the other drivers do, and make the default right for
  77  *    cams mounted the proper way and add an upside-down model list, with
  78  *    models where we need to flip-by-default.
  79  *
  80  * Despite knowing that going b) would cause a period of pain where we were
  81  * building the table I opted to go for option b), since a) is just too ugly,
  82  * and worse different from how every other driver does it leading to
  83  * confusion in the long run. This change was made in kernel 3.6.
  84  *
  85  * So for any user report about upside-down images since kernel 3.6 ask them
  86  * to provide the output of 'sudo dmidecode' so the laptop can be added in
  87  * the table below.
  88  */
  89 static const struct dmi_system_id stk_upside_down_dmi_table[] = {
  90         {
  91                 .ident = "ASUS G1",
  92                 .matches = {
  93                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
  94                         DMI_MATCH(DMI_PRODUCT_NAME, "G1")
  95                 }
  96         }, {
  97                 .ident = "ASUS F3JC",
  98                 .matches = {
  99                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 100                         DMI_MATCH(DMI_PRODUCT_NAME, "F3JC")
 101                 }
 102         },
 103         {
 104                 .ident = "T12Rg-H",
 105                 .matches = {
 106                         DMI_MATCH(DMI_SYS_VENDOR, "HCL Infosystems Limited"),
 107                         DMI_MATCH(DMI_PRODUCT_NAME, "T12Rg-H")
 108                 }
 109         },
 110         {
 111                 .ident = "ASUS A6VM",
 112                 .matches = {
 113                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 114                         DMI_MATCH(DMI_PRODUCT_NAME, "A6VM")
 115                 }
 116         },
 117         {}
 118 };
 119
 120
 121 /*
 122  * Basic stuff
 123  */
 124 int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
 125 {
 126         struct usb_device *udev = dev->udev;
 127         int ret;
 128
 129         ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 130                         0x01,
 131                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 132                         value,
 133                         index,
 134                         NULL,
 135                         0,
 136                         500);
 137         if (ret < 0)
 138                 return ret;
 139         else
 140                 return 0;
 141 }
 142
 143 int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value)
 144 {
 145         struct usb_device *udev = dev->udev;
 146         unsigned char *buf;
 147         int ret;
 148
 149         buf = kmalloc(sizeof(u8), GFP_KERNEL);
 150         if (!buf)
 151                 return -ENOMEM;
 152
 153         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 154                         0x00,
 155                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 156                         0x00,
 157                         index,
 158                         buf,
 159                         sizeof(u8),
 160                         500);
 161         if (ret >= 0)
 162                 *value = *buf;
 163
 164         kfree(buf);
 165
 166         if (ret < 0)
 167                 return ret;
 168         else
 169                 return 0;
 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                 pr_err("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                 pr_err("usb_set_interface failed !\n");
 189         if (stk_sensor_wakeup(dev))
 190                 pr_err("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                         pr_err("usb_set_interface failed !\n");
 232                 if (stk_sensor_sleep(dev))
 233                         pr_err("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                 pr_err("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                 pr_err("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                 pr_err_ratelimited("isoc_handler without available buffer!\n");
 340                 goto resubmit;
 341         }
 342         fb = list_first_entry(&dev->sio_avail,
 343                         struct stk_sio_buffer, list);
 344         fill = fb->buffer + fb->v4lbuf.bytesused;
 345
 346         for (i = 0; i < urb->number_of_packets; i++) {
 347                 if (urb->iso_frame_desc[i].status != 0) {
 348                         if (urb->iso_frame_desc[i].status != -EXDEV)
 349                                 pr_err("Frame %d has error %d\n",
 350                                        i, urb->iso_frame_desc[i].status);
 351                         continue;
 352                 }
 353                 framelen = urb->iso_frame_desc[i].actual_length;
 354                 iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 355
 356                 if (framelen <= 4)
 357                         continue; /* no data */
 358
 359                 /*
 360                  * we found something informational from there
 361                  * the isoc frames have to type of headers
 362                  * type1: 00 xx 00 00 or 20 xx 00 00
 363                  * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
 364                  * xx is a sequencer which has never been seen over 0x3f
 365                  * imho data written down looks like bayer, i see similarities
 366                  * after every 640 bytes
 367                  */
 368                 if (*iso_buf & 0x80) {
 369                         framelen -= 8;
 370                         iso_buf += 8;
 371                         /* This marks a new frame */
 372                         if (fb->v4lbuf.bytesused != 0
 373                                 && fb->v4lbuf.bytesused != dev->frame_size) {
 374                                 pr_err_ratelimited("frame %d, bytesused=%d, skipping\n",
 375                                                    i, fb->v4lbuf.bytesused);
 376                                 fb->v4lbuf.bytesused = 0;
 377                                 fill = fb->buffer;
 378                         } else if (fb->v4lbuf.bytesused == dev->frame_size) {
 379                                 if (list_is_singular(&dev->sio_avail)) {
 380                                         /* Always reuse the last buffer */
 381                                         fb->v4lbuf.bytesused = 0;
 382                                         fill = fb->buffer;
 383                                 } else {
 384                                         list_move_tail(dev->sio_avail.next,
 385                                                 &dev->sio_full);
 386                                         wake_up(&dev->wait_frame);
 387                                         fb = list_first_entry(&dev->sio_avail,
 388                                                 struct stk_sio_buffer, list);
 389                                         fb->v4lbuf.bytesused = 0;
 390                                         fill = fb->buffer;
 391                                 }
 392                         }
 393                 } else {
 394                         framelen -= 4;
 395                         iso_buf += 4;
 396                 }
 397
 398                 /* Our buffer is full !!! */
 399                 if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
 400                         pr_err_ratelimited("Frame buffer overflow, lost sync\n");
 401                         /*FIXME Do something here? */
 402                         continue;
 403                 }
 404                 spin_unlock_irqrestore(&dev->spinlock, flags);
 405                 memcpy(fill, iso_buf, framelen);
 406                 spin_lock_irqsave(&dev->spinlock, flags);
 407                 fill += framelen;
 408
 409                 /* New size of our buffer */
 410                 fb->v4lbuf.bytesused += framelen;
 411         }
 412
 413 resubmit:
 414         spin_unlock_irqrestore(&dev->spinlock, flags);
 415         urb->dev = dev->udev;
 416         ret = usb_submit_urb(urb, GFP_ATOMIC);
 417         if (ret != 0) {
 418                 pr_err("Error (%d) re-submitting urb in stk_isoc_handler\n",
 419                        ret);
 420         }
 421 }
 422
 423 /* -------------------------------------------- */
 424
 425 static int stk_prepare_iso(struct stk_camera *dev)
 426 {
 427         void *kbuf;
 428         int i, j;
 429         struct urb *urb;
 430         struct usb_device *udev;
 431
 432         if (dev == NULL)
 433                 return -ENXIO;
 434         udev = dev->udev;
 435
 436         if (dev->isobufs)
 437                 pr_err("isobufs already allocated. Bad\n");
 438         else
 439                 dev->isobufs = kcalloc(MAX_ISO_BUFS, sizeof(*dev->isobufs),
 440                                        GFP_KERNEL);
 441         if (dev->isobufs == NULL) {
 442                 pr_err("Unable to allocate iso buffers\n");
 443                 return -ENOMEM;
 444         }
 445         for (i = 0; i < MAX_ISO_BUFS; i++) {
 446                 if (dev->isobufs[i].data == NULL) {
 447                         kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
 448                         if (kbuf == NULL) {
 449                                 pr_err("Failed to allocate iso buffer %d\n", i);
 450                                 goto isobufs_out;
 451                         }
 452                         dev->isobufs[i].data = kbuf;
 453                 } else
 454                         pr_err("isobuf data already allocated\n");
 455                 if (dev->isobufs[i].urb == NULL) {
 456                         urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
 457                         if (urb == NULL)
 458                                 goto isobufs_out;
 459                         dev->isobufs[i].urb = urb;
 460                 } else {
 461                         pr_err("Killing URB\n");
 462                         usb_kill_urb(dev->isobufs[i].urb);
 463                         urb = dev->isobufs[i].urb;
 464                 }
 465                 urb->interval = 1;
 466                 urb->dev = udev;
 467                 urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
 468                 urb->transfer_flags = URB_ISO_ASAP;
 469                 urb->transfer_buffer = dev->isobufs[i].data;
 470                 urb->transfer_buffer_length = ISO_BUFFER_SIZE;
 471                 urb->complete = stk_isoc_handler;
 472                 urb->context = dev;
 473                 urb->start_frame = 0;
 474                 urb->number_of_packets = ISO_FRAMES_PER_DESC;
 475
 476                 for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
 477                         urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
 478                         urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
 479                 }
 480         }
 481         set_memallocd(dev);
 482         return 0;
 483
 484 isobufs_out:
 485         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
 486                 kfree(dev->isobufs[i].data);
 487         for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
 488                 usb_free_urb(dev->isobufs[i].urb);
 489         kfree(dev->isobufs);
 490         dev->isobufs = NULL;
 491         return -ENOMEM;
 492 }
 493
 494 static void stk_clean_iso(struct stk_camera *dev)
 495 {
 496         int i;
 497
 498         if (dev == NULL || dev->isobufs == NULL)
 499                 return;
 500
 501         for (i = 0; i < MAX_ISO_BUFS; i++) {
 502                 struct urb *urb;
 503
 504                 urb = dev->isobufs[i].urb;
 505                 if (urb) {
 506                         if (atomic_read(&dev->urbs_used) && is_present(dev))
 507                                 usb_kill_urb(urb);
 508                         usb_free_urb(urb);
 509                 }
 510                 kfree(dev->isobufs[i].data);
 511         }
 512         kfree(dev->isobufs);
 513         dev->isobufs = NULL;
 514         unset_memallocd(dev);
 515 }
 516
 517 static int stk_setup_siobuf(struct stk_camera *dev, int index)
 518 {
 519         struct stk_sio_buffer *buf = dev->sio_bufs + index;
 520         INIT_LIST_HEAD(&buf->list);
 521         buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
 522         buf->buffer = vmalloc_user(buf->v4lbuf.length);
 523         if (buf->buffer == NULL)
 524                 return -ENOMEM;
 525         buf->mapcount = 0;
 526         buf->dev = dev;
 527         buf->v4lbuf.index = index;
 528         buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 529         buf->v4lbuf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 530         buf->v4lbuf.field = V4L2_FIELD_NONE;
 531         buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
 532         buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
 533         return 0;
 534 }
 535
 536 static int stk_free_sio_buffers(struct stk_camera *dev)
 537 {
 538         int i;
 539         int nbufs;
 540         unsigned long flags;
 541         if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
 542                 return 0;
 543         /*
 544         * If any buffers are mapped, we cannot free them at all.
 545         */
 546         for (i = 0; i < dev->n_sbufs; i++) {
 547                 if (dev->sio_bufs[i].mapcount > 0)
 548                         return -EBUSY;
 549         }
 550         /*
 551         * OK, let's do it.
 552         */
 553         spin_lock_irqsave(&dev->spinlock, flags);
 554         INIT_LIST_HEAD(&dev->sio_avail);
 555         INIT_LIST_HEAD(&dev->sio_full);
 556         nbufs = dev->n_sbufs;
 557         dev->n_sbufs = 0;
 558         spin_unlock_irqrestore(&dev->spinlock, flags);
 559         for (i = 0; i < nbufs; i++)
 560                 vfree(dev->sio_bufs[i].buffer);
 561         kfree(dev->sio_bufs);
 562         dev->sio_bufs = NULL;
 563         return 0;
 564 }
 565
 566 static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
 567 {
 568         int i;
 569         if (dev->sio_bufs != NULL)
 570                 pr_err("sio_bufs already allocated\n");
 571         else {
 572                 dev->sio_bufs = kcalloc(n_sbufs,
 573                                         sizeof(struct stk_sio_buffer),
 574                                         GFP_KERNEL);
 575                 if (dev->sio_bufs == NULL)
 576                         return -ENOMEM;
 577                 for (i = 0; i < n_sbufs; i++) {
 578                         if (stk_setup_siobuf(dev, i))
 579                                 return (dev->n_sbufs > 1 ? 0 : -ENOMEM);
 580                         dev->n_sbufs = i+1;
 581                 }
 582         }
 583         return 0;
 584 }
 585
 586 static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
 587 {
 588         int err;
 589         err = stk_prepare_iso(dev);
 590         if (err) {
 591                 stk_clean_iso(dev);
 592                 return err;
 593         }
 594         err = stk_prepare_sio_buffers(dev, n_sbufs);
 595         if (err) {
 596                 stk_free_sio_buffers(dev);
 597                 return err;
 598         }
 599         return 0;
 600 }
 601
 602 static void stk_free_buffers(struct stk_camera *dev)
 603 {
 604         stk_clean_iso(dev);
 605         stk_free_sio_buffers(dev);
 606 }
 607 /* -------------------------------------------- */
 608
 609 /* v4l file operations */
 610
 611 static int v4l_stk_open(struct file *fp)
 612 {
 613         struct stk_camera *dev = video_drvdata(fp);
 614         int err;
 615
 616         if (dev == NULL || !is_present(dev))
 617                 return -ENXIO;
 618
 619         if (mutex_lock_interruptible(&dev->lock))
 620                 return -ERESTARTSYS;
 621         if (!dev->first_init)
 622                 stk_camera_write_reg(dev, 0x0, 0x24);
 623         else
 624                 dev->first_init = 0;
 625
 626         err = v4l2_fh_open(fp);
 627         if (!err)
 628                 usb_autopm_get_interface(dev->interface);
 629         mutex_unlock(&dev->lock);
 630         return err;
 631 }
 632
 633 static int v4l_stk_release(struct file *fp)
 634 {
 635         struct stk_camera *dev = video_drvdata(fp);
 636
 637         mutex_lock(&dev->lock);
 638         if (dev->owner == fp) {
 639                 stk_stop_stream(dev);
 640                 stk_free_buffers(dev);
 641                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
 642                 unset_initialised(dev);
 643                 dev->owner = NULL;
 644         }
 645
 646         usb_autopm_put_interface(dev->interface);
 647         mutex_unlock(&dev->lock);
 648         return v4l2_fh_release(fp);
 649 }
 650
 651 static ssize_t stk_read(struct file *fp, char __user *buf,
 652                 size_t count, loff_t *f_pos)
 653 {
 654         int i;
 655         int ret;
 656         unsigned long flags;
 657         struct stk_sio_buffer *sbuf;
 658         struct stk_camera *dev = video_drvdata(fp);
 659
 660         if (!is_present(dev))
 661                 return -EIO;
 662         if (dev->owner && (!dev->reading || dev->owner != fp))
 663                 return -EBUSY;
 664         dev->owner = fp;
 665         if (!is_streaming(dev)) {
 666                 if (stk_initialise(dev)
 667                         || stk_allocate_buffers(dev, 3)
 668                         || stk_start_stream(dev))
 669                         return -ENOMEM;
 670                 dev->reading = 1;
 671                 spin_lock_irqsave(&dev->spinlock, flags);
 672                 for (i = 0; i < dev->n_sbufs; i++) {
 673                         list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
 674                         dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
 675                 }
 676                 spin_unlock_irqrestore(&dev->spinlock, flags);
 677         }
 678         if (*f_pos == 0) {
 679                 if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
 680                         return -EWOULDBLOCK;
 681                 ret = wait_event_interruptible(dev->wait_frame,
 682                         !list_empty(&dev->sio_full) || !is_present(dev));
 683                 if (ret)
 684                         return ret;
 685                 if (!is_present(dev))
 686                         return -EIO;
 687         }
 688         if (count + *f_pos > dev->frame_size)
 689                 count = dev->frame_size - *f_pos;
 690         spin_lock_irqsave(&dev->spinlock, flags);
 691         if (list_empty(&dev->sio_full)) {
 692                 spin_unlock_irqrestore(&dev->spinlock, flags);
 693                 pr_err("BUG: No siobufs ready\n");
 694                 return 0;
 695         }
 696         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
 697         spin_unlock_irqrestore(&dev->spinlock, flags);
 698
 699         if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
 700                 return -EFAULT;
 701
 702         *f_pos += count;
 703
 704         if (*f_pos >= dev->frame_size) {
 705                 *f_pos = 0;
 706                 spin_lock_irqsave(&dev->spinlock, flags);
 707                 list_move_tail(&sbuf->list, &dev->sio_avail);
 708                 spin_unlock_irqrestore(&dev->spinlock, flags);
 709         }
 710         return count;
 711 }
 712
 713 static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
 714                 size_t count, loff_t *f_pos)
 715 {
 716         struct stk_camera *dev = video_drvdata(fp);
 717         int ret;
 718
 719         if (mutex_lock_interruptible(&dev->lock))
 720                 return -ERESTARTSYS;
 721         ret = stk_read(fp, buf, count, f_pos);
 722         mutex_unlock(&dev->lock);
 723         return ret;
 724 }
 725
 726 static __poll_t v4l_stk_poll(struct file *fp, poll_table *wait)
 727 {
 728         struct stk_camera *dev = video_drvdata(fp);
 729         __poll_t res = v4l2_ctrl_poll(fp, wait);
 730
 731         poll_wait(fp, &dev->wait_frame, wait);
 732
 733         if (!is_present(dev))
 734                 return EPOLLERR;
 735
 736         if (!list_empty(&dev->sio_full))
 737                 return res | EPOLLIN | EPOLLRDNORM;
 738
 739         return res;
 740 }
 741
 742
 743 static void stk_v4l_vm_open(struct vm_area_struct *vma)
 744 {
 745         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 746         sbuf->mapcount++;
 747 }
 748 static void stk_v4l_vm_close(struct vm_area_struct *vma)
 749 {
 750         struct stk_sio_buffer *sbuf = vma->vm_private_data;
 751         sbuf->mapcount--;
 752         if (sbuf->mapcount == 0)
 753                 sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
 754 }
 755 static const struct vm_operations_struct stk_v4l_vm_ops = {
 756         .open = stk_v4l_vm_open,
 757         .close = stk_v4l_vm_close
 758 };
 759
 760 static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
 761 {
 762         unsigned int i;
 763         int ret;
 764         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 765         struct stk_camera *dev = video_drvdata(fp);
 766         struct stk_sio_buffer *sbuf = NULL;
 767
 768         if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
 769                 return -EINVAL;
 770
 771         for (i = 0; i < dev->n_sbufs; i++) {
 772                 if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
 773                         sbuf = dev->sio_bufs + i;
 774                         break;
 775                 }
 776         }
 777         if (sbuf == NULL)
 778                 return -EINVAL;
 779         ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
 780         if (ret)
 781                 return ret;
 782         vma->vm_flags |= VM_DONTEXPAND;
 783         vma->vm_private_data = sbuf;
 784         vma->vm_ops = &stk_v4l_vm_ops;
 785         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
 786         stk_v4l_vm_open(vma);
 787         return 0;
 788 }
 789
 790 /* v4l ioctl handlers */
 791
 792 static int stk_vidioc_querycap(struct file *filp,
 793                 void *priv, struct v4l2_capability *cap)
 794 {
 795         struct stk_camera *dev = video_drvdata(filp);
 796
 797         strscpy(cap->driver, "stk", sizeof(cap->driver));
 798         strscpy(cap->card, "stk", sizeof(cap->card));
 799         usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
 800         return 0;
 801 }
 802
 803 static int stk_vidioc_enum_input(struct file *filp,
 804                 void *priv, struct v4l2_input *input)
 805 {
 806         if (input->index != 0)
 807                 return -EINVAL;
 808
 809         strscpy(input->name, "Syntek USB Camera", sizeof(input->name));
 810         input->type = V4L2_INPUT_TYPE_CAMERA;
 811         return 0;
 812 }
 813
 814
 815 static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 816 {
 817         *i = 0;
 818         return 0;
 819 }
 820
 821 static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 822 {
 823         return i ? -EINVAL : 0;
 824 }
 825
 826 static int stk_s_ctrl(struct v4l2_ctrl *ctrl)
 827 {
 828         struct stk_camera *dev =
 829                 container_of(ctrl->handler, struct stk_camera, hdl);
 830
 831         switch (ctrl->id) {
 832         case V4L2_CID_BRIGHTNESS:
 833                 return stk_sensor_set_brightness(dev, ctrl->val);
 834         case V4L2_CID_HFLIP:
 835                 if (dmi_check_system(stk_upside_down_dmi_table))
 836                         dev->vsettings.hflip = !ctrl->val;
 837                 else
 838                         dev->vsettings.hflip = ctrl->val;
 839                 return 0;
 840         case V4L2_CID_VFLIP:
 841                 if (dmi_check_system(stk_upside_down_dmi_table))
 842                         dev->vsettings.vflip = !ctrl->val;
 843                 else
 844                         dev->vsettings.vflip = ctrl->val;
 845                 return 0;
 846         default:
 847                 return -EINVAL;
 848         }
 849         return 0;
 850 }
 851
 852
 853 static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
 854                 void *priv, struct v4l2_fmtdesc *fmtd)
 855 {
 856         switch (fmtd->index) {
 857         case 0:
 858                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
 859                 break;
 860         case 1:
 861                 fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
 862                 break;
 863         case 2:
 864                 fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
 865                 break;
 866         case 3:
 867                 fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
 868                 break;
 869         case 4:
 870                 fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
 871                 break;
 872         default:
 873                 return -EINVAL;
 874         }
 875         return 0;
 876 }
 877
 878 static struct stk_size {
 879         unsigned w;
 880         unsigned h;
 881         enum stk_mode m;
 882 } stk_sizes[] = {
 883         { .w = 1280, .h = 1024, .m = MODE_SXGA, },
 884         { .w = 640,  .h = 480,  .m = MODE_VGA,  },
 885         { .w = 352,  .h = 288,  .m = MODE_CIF,  },
 886         { .w = 320,  .h = 240,  .m = MODE_QVGA, },
 887         { .w = 176,  .h = 144,  .m = MODE_QCIF, },
 888 };
 889
 890 static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
 891                 void *priv, struct v4l2_format *f)
 892 {
 893         struct v4l2_pix_format *pix_format = &f->fmt.pix;
 894         struct stk_camera *dev = video_drvdata(filp);
 895         int i;
 896
 897         for (i = 0; i < ARRAY_SIZE(stk_sizes) &&
 898                         stk_sizes[i].m != dev->vsettings.mode; i++)
 899                 ;
 900         if (i == ARRAY_SIZE(stk_sizes)) {
 901                 pr_err("ERROR: mode invalid\n");
 902                 return -EINVAL;
 903         }
 904         pix_format->width = stk_sizes[i].w;
 905         pix_format->height = stk_sizes[i].h;
 906         pix_format->field = V4L2_FIELD_NONE;
 907         pix_format->colorspace = V4L2_COLORSPACE_SRGB;
 908         pix_format->pixelformat = dev->vsettings.palette;
 909         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 910                 pix_format->bytesperline = pix_format->width;
 911         else
 912                 pix_format->bytesperline = 2 * pix_format->width;
 913         pix_format->sizeimage = pix_format->bytesperline
 914                                 * pix_format->height;
 915         return 0;
 916 }
 917
 918 static int stk_try_fmt_vid_cap(struct file *filp,
 919                 struct v4l2_format *fmtd, int *idx)
 920 {
 921         int i;
 922         switch (fmtd->fmt.pix.pixelformat) {
 923         case V4L2_PIX_FMT_RGB565:
 924         case V4L2_PIX_FMT_RGB565X:
 925         case V4L2_PIX_FMT_UYVY:
 926         case V4L2_PIX_FMT_YUYV:
 927         case V4L2_PIX_FMT_SBGGR8:
 928                 break;
 929         default:
 930                 return -EINVAL;
 931         }
 932         for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
 933                 if (fmtd->fmt.pix.width > stk_sizes[i].w)
 934                         break;
 935         }
 936         if (i == ARRAY_SIZE(stk_sizes)
 937                 || (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
 938                         < abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
 939                 fmtd->fmt.pix.height = stk_sizes[i-1].h;
 940                 fmtd->fmt.pix.width = stk_sizes[i-1].w;
 941                 if (idx)
 942                         *idx = i - 1;
 943         } else {
 944                 fmtd->fmt.pix.height = stk_sizes[i].h;
 945                 fmtd->fmt.pix.width = stk_sizes[i].w;
 946                 if (idx)
 947                         *idx = i;
 948         }
 949
 950         fmtd->fmt.pix.field = V4L2_FIELD_NONE;
 951         fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 952         if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
 953                 fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
 954         else
 955                 fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
 956         fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
 957                 * fmtd->fmt.pix.height;
 958         return 0;
 959 }
 960
 961 static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
 962                 void *priv, struct v4l2_format *fmtd)
 963 {
 964         return stk_try_fmt_vid_cap(filp, fmtd, NULL);
 965 }
 966
 967 static int stk_setup_format(struct stk_camera *dev)
 968 {
 969         int i = 0;
 970         int depth;
 971         if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
 972                 depth = 1;
 973         else
 974                 depth = 2;
 975         while (i < ARRAY_SIZE(stk_sizes) &&
 976                         stk_sizes[i].m != dev->vsettings.mode)
 977                 i++;
 978         if (i == ARRAY_SIZE(stk_sizes)) {
 979                 pr_err("Something is broken in %s\n", __func__);
 980                 return -EFAULT;
 981         }
 982         /* This registers controls some timings, not sure of what. */
 983         stk_camera_write_reg(dev, 0x001b, 0x0e);
 984         if (dev->vsettings.mode == MODE_SXGA)
 985                 stk_camera_write_reg(dev, 0x001c, 0x0e);
 986         else
 987                 stk_camera_write_reg(dev, 0x001c, 0x46);
 988         /*
 989          * Registers 0x0115 0x0114 are the size of each line (bytes),
 990          * regs 0x0117 0x0116 are the height of the image.
 991          */
 992         stk_camera_write_reg(dev, 0x0115,
 993                 ((stk_sizes[i].w * depth) >> 8) & 0xff);
 994         stk_camera_write_reg(dev, 0x0114,
 995                 (stk_sizes[i].w * depth) & 0xff);
 996         stk_camera_write_reg(dev, 0x0117,
 997                 (stk_sizes[i].h >> 8) & 0xff);
 998         stk_camera_write_reg(dev, 0x0116,
 999                 stk_sizes[i].h & 0xff);
1000         return stk_sensor_configure(dev);
1001 }
1002
1003 static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
1004                 void *priv, struct v4l2_format *fmtd)
1005 {
1006         int ret;
1007         int idx;
1008         struct stk_camera *dev = video_drvdata(filp);
1009
1010         if (dev == NULL)
1011                 return -ENODEV;
1012         if (!is_present(dev))
1013                 return -ENODEV;
1014         if (is_streaming(dev))
1015                 return -EBUSY;
1016         if (dev->owner)
1017                 return -EBUSY;
1018         ret = stk_try_fmt_vid_cap(filp, fmtd, &idx);
1019         if (ret)
1020                 return ret;
1021
1022         dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
1023         stk_free_buffers(dev);
1024         dev->frame_size = fmtd->fmt.pix.sizeimage;
1025         dev->vsettings.mode = stk_sizes[idx].m;
1026
1027         stk_initialise(dev);
1028         return stk_setup_format(dev);
1029 }
1030
1031 static int stk_vidioc_reqbufs(struct file *filp,
1032                 void *priv, struct v4l2_requestbuffers *rb)
1033 {
1034         struct stk_camera *dev = video_drvdata(filp);
1035
1036         if (dev == NULL)
1037                 return -ENODEV;
1038         if (rb->memory != V4L2_MEMORY_MMAP)
1039                 return -EINVAL;
1040         if (is_streaming(dev)
1041                 || (dev->owner && dev->owner != filp))
1042                 return -EBUSY;
1043         stk_free_buffers(dev);
1044         if (rb->count == 0) {
1045                 stk_camera_write_reg(dev, 0x0, 0x49); /* turn off the LED */
1046                 unset_initialised(dev);
1047                 dev->owner = NULL;
1048                 return 0;
1049         }
1050         dev->owner = filp;
1051
1052         /*FIXME If they ask for zero, we must stop streaming and free */
1053         if (rb->count < 3)
1054                 rb->count = 3;
1055         /* Arbitrary limit */
1056         else if (rb->count > 5)
1057                 rb->count = 5;
1058
1059         stk_allocate_buffers(dev, rb->count);
1060         rb->count = dev->n_sbufs;
1061         return 0;
1062 }
1063
1064 static int stk_vidioc_querybuf(struct file *filp,
1065                 void *priv, struct v4l2_buffer *buf)
1066 {
1067         struct stk_camera *dev = video_drvdata(filp);
1068         struct stk_sio_buffer *sbuf;
1069
1070         if (buf->index >= dev->n_sbufs)
1071                 return -EINVAL;
1072         sbuf = dev->sio_bufs + buf->index;
1073         *buf = sbuf->v4lbuf;
1074         return 0;
1075 }
1076
1077 static int stk_vidioc_qbuf(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         unsigned long flags;
1083
1084         if (buf->memory != V4L2_MEMORY_MMAP)
1085                 return -EINVAL;
1086
1087         if (buf->index >= dev->n_sbufs)
1088                 return -EINVAL;
1089         sbuf = dev->sio_bufs + buf->index;
1090         if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
1091                 return 0;
1092         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
1093         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
1094         spin_lock_irqsave(&dev->spinlock, flags);
1095         list_add_tail(&sbuf->list, &dev->sio_avail);
1096         *buf = sbuf->v4lbuf;
1097         spin_unlock_irqrestore(&dev->spinlock, flags);
1098         return 0;
1099 }
1100
1101 static int stk_vidioc_dqbuf(struct file *filp,
1102                 void *priv, struct v4l2_buffer *buf)
1103 {
1104         struct stk_camera *dev = video_drvdata(filp);
1105         struct stk_sio_buffer *sbuf;
1106         unsigned long flags;
1107         int ret;
1108
1109         if (!is_streaming(dev))
1110                 return -EINVAL;
1111
1112         if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
1113                 return -EWOULDBLOCK;
1114         ret = wait_event_interruptible(dev->wait_frame,
1115                 !list_empty(&dev->sio_full) || !is_present(dev));
1116         if (ret)
1117                 return ret;
1118         if (!is_present(dev))
1119                 return -EIO;
1120
1121         spin_lock_irqsave(&dev->spinlock, flags);
1122         sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
1123         list_del_init(&sbuf->list);
1124         spin_unlock_irqrestore(&dev->spinlock, flags);
1125         sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
1126         sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
1127         sbuf->v4lbuf.sequence = ++dev->sequence;
1128         v4l2_buffer_set_timestamp(&sbuf->v4lbuf, ktime_get_ns());
1129
1130         *buf = sbuf->v4lbuf;
1131         return 0;
1132 }
1133
1134 static int stk_vidioc_streamon(struct file *filp,
1135                 void *priv, enum v4l2_buf_type type)
1136 {
1137         struct stk_camera *dev = video_drvdata(filp);
1138         if (is_streaming(dev))
1139                 return 0;
1140         if (dev->sio_bufs == NULL)
1141                 return -EINVAL;
1142         dev->sequence = 0;
1143         return stk_start_stream(dev);
1144 }
1145
1146 static int stk_vidioc_streamoff(struct file *filp,
1147                 void *priv, enum v4l2_buf_type type)
1148 {
1149         struct stk_camera *dev = video_drvdata(filp);
1150         unsigned long flags;
1151         int i;
1152         stk_stop_stream(dev);
1153         spin_lock_irqsave(&dev->spinlock, flags);
1154         INIT_LIST_HEAD(&dev->sio_avail);
1155         INIT_LIST_HEAD(&dev->sio_full);
1156         for (i = 0; i < dev->n_sbufs; i++) {
1157                 INIT_LIST_HEAD(&dev->sio_bufs[i].list);
1158                 dev->sio_bufs[i].v4lbuf.flags = 0;
1159         }
1160         spin_unlock_irqrestore(&dev->spinlock, flags);
1161         return 0;
1162 }
1163
1164
1165 static int stk_vidioc_g_parm(struct file *filp,
1166                 void *priv, struct v4l2_streamparm *sp)
1167 {
1168         /*FIXME This is not correct */
1169         sp->parm.capture.timeperframe.numerator = 1;
1170         sp->parm.capture.timeperframe.denominator = 30;
1171         sp->parm.capture.readbuffers = 2;
1172         return 0;
1173 }
1174
1175 static int stk_vidioc_enum_framesizes(struct file *filp,
1176                 void *priv, struct v4l2_frmsizeenum *frms)
1177 {
1178         if (frms->index >= ARRAY_SIZE(stk_sizes))
1179                 return -EINVAL;
1180         switch (frms->pixel_format) {
1181         case V4L2_PIX_FMT_RGB565:
1182         case V4L2_PIX_FMT_RGB565X:
1183         case V4L2_PIX_FMT_UYVY:
1184         case V4L2_PIX_FMT_YUYV:
1185         case V4L2_PIX_FMT_SBGGR8:
1186                 frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1187                 frms->discrete.width = stk_sizes[frms->index].w;
1188                 frms->discrete.height = stk_sizes[frms->index].h;
1189                 return 0;
1190         default: return -EINVAL;
1191         }
1192 }
1193
1194 static const struct v4l2_ctrl_ops stk_ctrl_ops = {
1195         .s_ctrl = stk_s_ctrl,
1196 };
1197
1198 static const struct v4l2_file_operations v4l_stk_fops = {
1199         .owner = THIS_MODULE,
1200         .open = v4l_stk_open,
1201         .release = v4l_stk_release,
1202         .read = v4l_stk_read,
1203         .poll = v4l_stk_poll,
1204         .mmap = v4l_stk_mmap,
1205         .unlocked_ioctl = video_ioctl2,
1206 };
1207
1208 static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
1209         .vidioc_querycap = stk_vidioc_querycap,
1210         .vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
1211         .vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
1212         .vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
1213         .vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
1214         .vidioc_enum_input = stk_vidioc_enum_input,
1215         .vidioc_s_input = stk_vidioc_s_input,
1216         .vidioc_g_input = stk_vidioc_g_input,
1217         .vidioc_reqbufs = stk_vidioc_reqbufs,
1218         .vidioc_querybuf = stk_vidioc_querybuf,
1219         .vidioc_qbuf = stk_vidioc_qbuf,
1220         .vidioc_dqbuf = stk_vidioc_dqbuf,
1221         .vidioc_streamon = stk_vidioc_streamon,
1222         .vidioc_streamoff = stk_vidioc_streamoff,
1223         .vidioc_g_parm = stk_vidioc_g_parm,
1224         .vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
1225         .vidioc_log_status = v4l2_ctrl_log_status,
1226         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1227         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1228 };
1229
1230 static void stk_v4l_dev_release(struct video_device *vd)
1231 {
1232         struct stk_camera *dev = vdev_to_camera(vd);
1233
1234         if (dev->sio_bufs != NULL || dev->isobufs != NULL)
1235                 pr_err("We are leaking memory\n");
1236         usb_put_intf(dev->interface);
1237 }
1238
1239 static const struct video_device stk_v4l_data = {
1240         .name = "stkwebcam",
1241         .fops = &v4l_stk_fops,
1242         .ioctl_ops = &v4l_stk_ioctl_ops,
1243         .release = stk_v4l_dev_release,
1244 };
1245
1246
1247 static int stk_register_video_device(struct stk_camera *dev)
1248 {
1249         int err;
1250
1251         dev->vdev = stk_v4l_data;
1252         dev->vdev.lock = &dev->lock;
1253         dev->vdev.v4l2_dev = &dev->v4l2_dev;
1254         dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1255                                 V4L2_CAP_STREAMING;
1256         video_set_drvdata(&dev->vdev, dev);
1257         err = video_register_device(&dev->vdev, VFL_TYPE_VIDEO, -1);
1258         if (err)
1259                 pr_err("v4l registration failed\n");
1260         else
1261                 pr_info("Syntek USB2.0 Camera is now controlling device %s\n",
1262                         video_device_node_name(&dev->vdev));
1263         return err;
1264 }
1265
1266
1267 /* USB Stuff */
1268
1269 static int stk_camera_probe(struct usb_interface *interface,
1270                 const struct usb_device_id *id)
1271 {
1272         struct v4l2_ctrl_handler *hdl;
1273         int err = 0;
1274         int i;
1275
1276         struct stk_camera *dev = NULL;
1277         struct usb_device *udev = interface_to_usbdev(interface);
1278         struct usb_host_interface *iface_desc;
1279         struct usb_endpoint_descriptor *endpoint;
1280
1281         dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
1282         if (dev == NULL) {
1283                 pr_err("Out of memory !\n");
1284                 return -ENOMEM;
1285         }
1286         err = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
1287         if (err < 0) {
1288                 dev_err(&udev->dev, "couldn't register v4l2_device\n");
1289                 kfree(dev);
1290                 return err;
1291         }
1292         hdl = &dev->hdl;
1293         v4l2_ctrl_handler_init(hdl, 3);
1294         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1295                           V4L2_CID_BRIGHTNESS, 0, 0xff, 0x1, 0x60);
1296         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1297                           V4L2_CID_HFLIP, 0, 1, 1, 1);
1298         v4l2_ctrl_new_std(hdl, &stk_ctrl_ops,
1299                           V4L2_CID_VFLIP, 0, 1, 1, 1);
1300         if (hdl->error) {
1301                 err = hdl->error;
1302                 dev_err(&udev->dev, "couldn't register control\n");
1303                 goto error;
1304         }
1305         dev->v4l2_dev.ctrl_handler = hdl;
1306
1307         spin_lock_init(&dev->spinlock);
1308         mutex_init(&dev->lock);
1309         init_waitqueue_head(&dev->wait_frame);
1310         dev->first_init = 1; /* webcam LED management */
1311
1312         dev->udev = udev;
1313         dev->interface = interface;
1314         usb_get_intf(interface);
1315
1316         if (hflip != -1)
1317                 dev->vsettings.hflip = hflip;
1318         else if (dmi_check_system(stk_upside_down_dmi_table))
1319                 dev->vsettings.hflip = 1;
1320         else
1321                 dev->vsettings.hflip = 0;
1322         if (vflip != -1)
1323                 dev->vsettings.vflip = vflip;
1324         else if (dmi_check_system(stk_upside_down_dmi_table))
1325                 dev->vsettings.vflip = 1;
1326         else
1327                 dev->vsettings.vflip = 0;
1328         dev->n_sbufs = 0;
1329         set_present(dev);
1330
1331         /* Set up the endpoint information
1332          * use only the first isoc-in endpoint
1333          * for the current alternate setting */
1334         iface_desc = interface->cur_altsetting;
1335
1336         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1337                 endpoint = &iface_desc->endpoint[i].desc;
1338
1339                 if (!dev->isoc_ep
1340                         && usb_endpoint_is_isoc_in(endpoint)) {
1341                         /* we found an isoc in endpoint */
1342                         dev->isoc_ep = usb_endpoint_num(endpoint);
1343                         break;
1344                 }
1345         }
1346         if (!dev->isoc_ep) {
1347                 pr_err("Could not find isoc-in endpoint\n");
1348                 err = -ENODEV;
1349                 goto error;
1350         }
1351         dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
1352         dev->vsettings.mode = MODE_VGA;
1353         dev->frame_size = 640 * 480 * 2;
1354
1355         INIT_LIST_HEAD(&dev->sio_avail);
1356         INIT_LIST_HEAD(&dev->sio_full);
1357
1358         usb_set_intfdata(interface, dev);
1359
1360         err = stk_register_video_device(dev);
1361         if (err)
1362                 goto error;
1363
1364         return 0;
1365
1366 error:
1367         v4l2_ctrl_handler_free(hdl);
1368         v4l2_device_unregister(&dev->v4l2_dev);
1369         kfree(dev);
1370         return err;
1371 }
1372
1373 static void stk_camera_disconnect(struct usb_interface *interface)
1374 {
1375         struct stk_camera *dev = usb_get_intfdata(interface);
1376
1377         usb_set_intfdata(interface, NULL);
1378         unset_present(dev);
1379
1380         wake_up_interruptible(&dev->wait_frame);
1381
1382         pr_info("Syntek USB2.0 Camera release resources device %s\n",
1383                 video_device_node_name(&dev->vdev));
1384
1385         video_unregister_device(&dev->vdev);
1386         v4l2_ctrl_handler_free(&dev->hdl);
1387         v4l2_device_unregister(&dev->v4l2_dev);
1388         kfree(dev);
1389 }
1390
1391 #ifdef CONFIG_PM
1392 static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
1393 {
1394         struct stk_camera *dev = usb_get_intfdata(intf);
1395         if (is_streaming(dev)) {
1396                 stk_stop_stream(dev);
1397                 /* yes, this is ugly */
1398                 set_streaming(dev);
1399         }
1400         return 0;
1401 }
1402
1403 static int stk_camera_resume(struct usb_interface *intf)
1404 {
1405         struct stk_camera *dev = usb_get_intfdata(intf);
1406         if (!is_initialised(dev))
1407                 return 0;
1408         unset_initialised(dev);
1409         stk_initialise(dev);
1410         stk_camera_write_reg(dev, 0x0, 0x49);
1411         stk_setup_format(dev);
1412         if (is_streaming(dev))
1413                 stk_start_stream(dev);
1414         return 0;
1415 }
1416 #endif
1417
1418 static struct usb_driver stk_camera_driver = {
1419         .name = "stkwebcam",
1420         .probe = stk_camera_probe,
1421         .disconnect = stk_camera_disconnect,
1422         .id_table = stkwebcam_table,
1423 #ifdef CONFIG_PM
1424         .suspend = stk_camera_suspend,
1425         .resume = stk_camera_resume,
1426 #endif
1427 };
1428
1429 module_usb_driver(stk_camera_driver);