drivers/media/video/et61x251/et61x251_core.c

   1 /***************************************************************************
   2  * V4L2 driver for ET61X[12]51 PC Camera Controllers                       *
   3  *                                                                         *
   4  * Copyright (C) 2006-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
   5  *                                                                         *
   6  * This program is free software; you can redistribute it and/or modify    *
   7  * it under the terms of the GNU General Public License as published by    *
   8  * the Free Software Foundation; either version 2 of the License, or       *
   9  * (at your option) any later version.                                     *
  10  *                                                                         *
  11  * This program is distributed in the hope that it will be useful,         *
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  14  * GNU General Public License for more details.                            *
  15  *                                                                         *
  16  * You should have received a copy of the GNU General Public License       *
  17  * along with this program; if not, write to the Free Software             *
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  19  ***************************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/param.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/device.h>
  28 #include <linux/fs.h>
  29 #include <linux/delay.h>
  30 #include <linux/compiler.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/poll.h>
  33 #include <linux/stat.h>
  34 #include <linux/mm.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/page-flags.h>
  37 #include <media/v4l2-ioctl.h>
  38 #include <asm/byteorder.h>
  39 #include <asm/page.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "et61x251.h"
  43
  44 /*****************************************************************************/
  45
  46 #define ET61X251_MODULE_NAME    "V4L2 driver for ET61X[12]51 "                \
  47                                 "PC Camera Controllers"
  48 #define ET61X251_MODULE_AUTHOR  "(C) 2006-2007 Luca Risolia"
  49 #define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  50 #define ET61X251_MODULE_LICENSE "GPL"
  51 #define ET61X251_MODULE_VERSION "1:1.09"
  52 #define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 9)
  53
  54 /*****************************************************************************/
  55
  56 MODULE_DEVICE_TABLE(usb, et61x251_id_table);
  57
  58 MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
  59 MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
  60 MODULE_VERSION(ET61X251_MODULE_VERSION);
  61 MODULE_LICENSE(ET61X251_MODULE_LICENSE);
  62
  63 static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
  64 module_param_array(video_nr, short, NULL, 0444);
  65 MODULE_PARM_DESC(video_nr,
  66                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  67                  "\n -1 = use next available (default)"
  68                  "\n  n = use minor number n (integer >= 0)"
  69                  "\nYou can specify up to "
  70                  __MODULE_STRING(ET61X251_MAX_DEVICES) " cameras this way."
  71                  "\nFor example:"
  72                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  73                  "\nthe second registered camera and use auto for the first"
  74                  "\none and for every other camera."
  75                  "\n");
  76
  77 static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  78                                ET61X251_FORCE_MUNMAP};
  79 module_param_array(force_munmap, bool, NULL, 0444);
  80 MODULE_PARM_DESC(force_munmap,
  81                  "\n<0|1[,...]> Force the application to unmap previously"
  82                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  83                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  84                  "\nthis feature. This parameter is specific for each"
  85                  "\ndetected camera."
  86                  "\n 0 = do not force memory unmapping"
  87                  "\n 1 = force memory unmapping (save memory)"
  88                  "\nDefault value is "__MODULE_STRING(ET61X251_FORCE_MUNMAP)"."
  89                  "\n");
  90
  91 static unsigned int frame_timeout[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  92                                        ET61X251_FRAME_TIMEOUT};
  93 module_param_array(frame_timeout, uint, NULL, 0644);
  94 MODULE_PARM_DESC(frame_timeout,
  95                  "\n<n[,...]> Timeout for a video frame in seconds."
  96                  "\nThis parameter is specific for each detected camera."
  97                  "\nDefault value is "
  98                  __MODULE_STRING(ET61X251_FRAME_TIMEOUT)"."
  99                  "\n");
 100
 101 #ifdef ET61X251_DEBUG
 102 static unsigned short debug = ET61X251_DEBUG_LEVEL;
 103 module_param(debug, ushort, 0644);
 104 MODULE_PARM_DESC(debug,
 105                  "\n<n> Debugging information level, from 0 to 3:"
 106                  "\n0 = none (use carefully)"
 107                  "\n1 = critical errors"
 108                  "\n2 = significant informations"
 109                  "\n3 = more verbose messages"
 110                  "\nLevel 3 is useful for testing only, when only "
 111                  "one device is used."
 112                  "\nDefault value is "__MODULE_STRING(ET61X251_DEBUG_LEVEL)"."
 113                  "\n");
 114 #endif
 115
 116 /*****************************************************************************/
 117
 118 static u32
 119 et61x251_request_buffers(struct et61x251_device* cam, u32 count,
 120                          enum et61x251_io_method io)
 121 {
 122         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 123         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 124         const size_t imagesize = cam->module_param.force_munmap ||
 125                                  io == IO_READ ?
 126                                  (p->width * p->height * p->priv) / 8 :
 127                                  (r->width * r->height * p->priv) / 8;
 128         void* buff = NULL;
 129         u32 i;
 130
 131         if (count > ET61X251_MAX_FRAMES)
 132                 count = ET61X251_MAX_FRAMES;
 133
 134         cam->nbuffers = count;
 135         while (cam->nbuffers > 0) {
 136                 if ((buff = vmalloc_32_user(cam->nbuffers *
 137                                             PAGE_ALIGN(imagesize))))
 138                         break;
 139                 cam->nbuffers--;
 140         }
 141
 142         for (i = 0; i < cam->nbuffers; i++) {
 143                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 144                 cam->frame[i].buf.index = i;
 145                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 146                 cam->frame[i].buf.length = imagesize;
 147                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 148                 cam->frame[i].buf.sequence = 0;
 149                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 150                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 151                 cam->frame[i].buf.flags = 0;
 152         }
 153
 154         return cam->nbuffers;
 155 }
 156
 157
 158 static void et61x251_release_buffers(struct et61x251_device* cam)
 159 {
 160         if (cam->nbuffers) {
 161                 vfree(cam->frame[0].bufmem);
 162                 cam->nbuffers = 0;
 163         }
 164         cam->frame_current = NULL;
 165 }
 166
 167
 168 static void et61x251_empty_framequeues(struct et61x251_device* cam)
 169 {
 170         u32 i;
 171
 172         INIT_LIST_HEAD(&cam->inqueue);
 173         INIT_LIST_HEAD(&cam->outqueue);
 174
 175         for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
 176                 cam->frame[i].state = F_UNUSED;
 177                 cam->frame[i].buf.bytesused = 0;
 178         }
 179 }
 180
 181
 182 static void et61x251_requeue_outqueue(struct et61x251_device* cam)
 183 {
 184         struct et61x251_frame_t *i;
 185
 186         list_for_each_entry(i, &cam->outqueue, frame) {
 187                 i->state = F_QUEUED;
 188                 list_add(&i->frame, &cam->inqueue);
 189         }
 190
 191         INIT_LIST_HEAD(&cam->outqueue);
 192 }
 193
 194
 195 static void et61x251_queue_unusedframes(struct et61x251_device* cam)
 196 {
 197         unsigned long lock_flags;
 198         u32 i;
 199
 200         for (i = 0; i < cam->nbuffers; i++)
 201                 if (cam->frame[i].state == F_UNUSED) {
 202                         cam->frame[i].state = F_QUEUED;
 203                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 204                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 205                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 206                 }
 207 }
 208
 209 /*****************************************************************************/
 210
 211 int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
 212 {
 213         struct usb_device* udev = cam->usbdev;
 214         u8* buff = cam->control_buffer;
 215         int res;
 216
 217         *buff = value;
 218
 219         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 220                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 221         if (res < 0) {
 222                 DBG(3, "Failed to write a register (value 0x%02X, index "
 223                        "0x%02X, error %d)", value, index, res);
 224                 return -1;
 225         }
 226
 227         return 0;
 228 }
 229
 230
 231 static int et61x251_read_reg(struct et61x251_device* cam, u16 index)
 232 {
 233         struct usb_device* udev = cam->usbdev;
 234         u8* buff = cam->control_buffer;
 235         int res;
 236
 237         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 238                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 239         if (res < 0)
 240                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 241                     index, res);
 242
 243         return (res >= 0) ? (int)(*buff) : -1;
 244 }
 245
 246
 247 static int
 248 et61x251_i2c_wait(struct et61x251_device* cam,
 249                   const struct et61x251_sensor* sensor)
 250 {
 251         int i, r;
 252
 253         for (i = 1; i <= 8; i++) {
 254                 if (sensor->interface == ET61X251_I2C_3WIRES) {
 255                         r = et61x251_read_reg(cam, 0x8e);
 256                         if (!(r & 0x02) && (r >= 0))
 257                                 return 0;
 258                 } else {
 259                         r = et61x251_read_reg(cam, 0x8b);
 260                         if (!(r & 0x01) && (r >= 0))
 261                                 return 0;
 262                 }
 263                 if (r < 0)
 264                         return -EIO;
 265                 udelay(8*8); /* minimum for sensors at 400kHz */
 266         }
 267
 268         return -EBUSY;
 269 }
 270
 271
 272 int
 273 et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
 274                        u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
 275                        u8 data8, u8 address)
 276 {
 277         struct usb_device* udev = cam->usbdev;
 278         u8* data = cam->control_buffer;
 279         int err = 0, res;
 280
 281         data[0] = data2;
 282         data[1] = data3;
 283         data[2] = data4;
 284         data[3] = data5;
 285         data[4] = data6;
 286         data[5] = data7;
 287         data[6] = data8;
 288         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 289                               0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
 290         if (res < 0)
 291                 err += res;
 292
 293         data[0] = address;
 294         data[1] = cam->sensor.i2c_slave_id;
 295         data[2] = cam->sensor.rsta | 0x02 | (n << 4);
 296         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 297                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 298         if (res < 0)
 299                 err += res;
 300
 301         /* Start writing through the serial interface */
 302         data[0] = data1;
 303         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 304                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 305         if (res < 0)
 306                 err += res;
 307
 308         err += et61x251_i2c_wait(cam, &cam->sensor);
 309
 310         if (err)
 311                 DBG(3, "I2C raw write failed for %s image sensor",
 312                     cam->sensor.name);
 313
 314         PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
 315               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
 316               " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
 317               data1, data2, data3, data4, data5, data6, data7, data8);
 318
 319         return err ? -1 : 0;
 320
 321 }
 322
 323
 324 /*****************************************************************************/
 325
 326 static void et61x251_urb_complete(struct urb *urb)
 327 {
 328         struct et61x251_device* cam = urb->context;
 329         struct et61x251_frame_t** f;
 330         size_t imagesize;
 331         u8 i;
 332         int err = 0;
 333
 334         if (urb->status == -ENOENT)
 335                 return;
 336
 337         f = &cam->frame_current;
 338
 339         if (cam->stream == STREAM_INTERRUPT) {
 340                 cam->stream = STREAM_OFF;
 341                 if ((*f))
 342                         (*f)->state = F_QUEUED;
 343                 DBG(3, "Stream interrupted");
 344                 wake_up(&cam->wait_stream);
 345         }
 346
 347         if (cam->state & DEV_DISCONNECTED)
 348                 return;
 349
 350         if (cam->state & DEV_MISCONFIGURED) {
 351                 wake_up_interruptible(&cam->wait_frame);
 352                 return;
 353         }
 354
 355         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 356                 goto resubmit_urb;
 357
 358         if (!(*f))
 359                 (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
 360                                   frame);
 361
 362         imagesize = (cam->sensor.pix_format.width *
 363                      cam->sensor.pix_format.height *
 364                      cam->sensor.pix_format.priv) / 8;
 365
 366         for (i = 0; i < urb->number_of_packets; i++) {
 367                 unsigned int len, status;
 368                 void *pos;
 369                 u8* b1, * b2, sof;
 370                 const u8 VOID_BYTES = 6;
 371                 size_t imglen;
 372
 373                 len = urb->iso_frame_desc[i].actual_length;
 374                 status = urb->iso_frame_desc[i].status;
 375                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 376
 377                 if (status) {
 378                         DBG(3, "Error in isochronous frame");
 379                         (*f)->state = F_ERROR;
 380                         continue;
 381                 }
 382
 383                 b1 = pos++;
 384                 b2 = pos++;
 385                 sof = ((*b1 & 0x3f) == 63);
 386                 imglen = ((*b1 & 0xc0) << 2) | *b2;
 387
 388                 PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
 389                       len, i, imglen);
 390
 391                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 392 start_of_frame:
 393                         if (sof) {
 394                                 (*f)->state = F_GRABBING;
 395                                 (*f)->buf.bytesused = 0;
 396                                 do_gettimeofday(&(*f)->buf.timestamp);
 397                                 pos += 22;
 398                                 DBG(3, "SOF detected: new video frame");
 399                         }
 400
 401                 if ((*f)->state == F_GRABBING) {
 402                         if (sof && (*f)->buf.bytesused) {
 403                                 if (cam->sensor.pix_format.pixelformat ==
 404                                                          V4L2_PIX_FMT_ET61X251)
 405                                         goto end_of_frame;
 406                                 else {
 407                                         DBG(3, "Not expected SOF detected "
 408                                                "after %lu bytes",
 409                                            (unsigned long)(*f)->buf.bytesused);
 410                                         (*f)->state = F_ERROR;
 411                                         continue;
 412                                 }
 413                         }
 414
 415                         if ((*f)->buf.bytesused + imglen > imagesize) {
 416                                 DBG(3, "Video frame size exceeded");
 417                                 (*f)->state = F_ERROR;
 418                                 continue;
 419                         }
 420
 421                         pos += VOID_BYTES;
 422
 423                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
 424                         (*f)->buf.bytesused += imglen;
 425
 426                         if ((*f)->buf.bytesused == imagesize) {
 427                                 u32 b;
 428 end_of_frame:
 429                                 b = (*f)->buf.bytesused;
 430                                 (*f)->state = F_DONE;
 431                                 (*f)->buf.sequence= ++cam->frame_count;
 432                                 spin_lock(&cam->queue_lock);
 433                                 list_move_tail(&(*f)->frame, &cam->outqueue);
 434                                 if (!list_empty(&cam->inqueue))
 435                                         (*f) = list_entry(cam->inqueue.next,
 436                                                        struct et61x251_frame_t,
 437                                                           frame);
 438                                 else
 439                                         (*f) = NULL;
 440                                 spin_unlock(&cam->queue_lock);
 441                                 DBG(3, "Video frame captured: : %lu bytes",
 442                                        (unsigned long)(b));
 443
 444                                 if (!(*f))
 445                                         goto resubmit_urb;
 446
 447                                 if (sof &&
 448                                     cam->sensor.pix_format.pixelformat ==
 449                                                          V4L2_PIX_FMT_ET61X251)
 450                                         goto start_of_frame;
 451                         }
 452                 }
 453         }
 454
 455 resubmit_urb:
 456         urb->dev = cam->usbdev;
 457         err = usb_submit_urb(urb, GFP_ATOMIC);
 458         if (err < 0 && err != -EPERM) {
 459                 cam->state |= DEV_MISCONFIGURED;
 460                 DBG(1, "usb_submit_urb() failed");
 461         }
 462
 463         wake_up_interruptible(&cam->wait_frame);
 464 }
 465
 466
 467 static int et61x251_start_transfer(struct et61x251_device* cam)
 468 {
 469         struct usb_device *udev = cam->usbdev;
 470         struct urb* urb;
 471         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 472                                                    usb_ifnum_to_if(udev, 0),
 473                                                    ET61X251_ALTERNATE_SETTING);
 474         const unsigned int psz = le16_to_cpu(altsetting->
 475                                              endpoint[0].desc.wMaxPacketSize);
 476         s8 i, j;
 477         int err = 0;
 478
 479         for (i = 0; i < ET61X251_URBS; i++) {
 480                 cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
 481                                                   GFP_KERNEL);
 482                 if (!cam->transfer_buffer[i]) {
 483                         err = -ENOMEM;
 484                         DBG(1, "Not enough memory");
 485                         goto free_buffers;
 486                 }
 487         }
 488
 489         for (i = 0; i < ET61X251_URBS; i++) {
 490                 urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
 491                 cam->urb[i] = urb;
 492                 if (!urb) {
 493                         err = -ENOMEM;
 494                         DBG(1, "usb_alloc_urb() failed");
 495                         goto free_urbs;
 496                 }
 497                 urb->dev = udev;
 498                 urb->context = cam;
 499                 urb->pipe = usb_rcvisocpipe(udev, 1);
 500                 urb->transfer_flags = URB_ISO_ASAP;
 501                 urb->number_of_packets = ET61X251_ISO_PACKETS;
 502                 urb->complete = et61x251_urb_complete;
 503                 urb->transfer_buffer = cam->transfer_buffer[i];
 504                 urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
 505                 urb->interval = 1;
 506                 for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
 507                         urb->iso_frame_desc[j].offset = psz * j;
 508                         urb->iso_frame_desc[j].length = psz;
 509                 }
 510         }
 511
 512         err = et61x251_write_reg(cam, 0x01, 0x03);
 513         err = et61x251_write_reg(cam, 0x00, 0x03);
 514         err = et61x251_write_reg(cam, 0x08, 0x03);
 515         if (err) {
 516                 err = -EIO;
 517                 DBG(1, "I/O hardware error");
 518                 goto free_urbs;
 519         }
 520
 521         err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
 522         if (err) {
 523                 DBG(1, "usb_set_interface() failed");
 524                 goto free_urbs;
 525         }
 526
 527         cam->frame_current = NULL;
 528
 529         for (i = 0; i < ET61X251_URBS; i++) {
 530                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 531                 if (err) {
 532                         for (j = i-1; j >= 0; j--)
 533                                 usb_kill_urb(cam->urb[j]);
 534                         DBG(1, "usb_submit_urb() failed, error %d", err);
 535                         goto free_urbs;
 536                 }
 537         }
 538
 539         return 0;
 540
 541 free_urbs:
 542         for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
 543                 usb_free_urb(cam->urb[i]);
 544
 545 free_buffers:
 546         for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
 547                 kfree(cam->transfer_buffer[i]);
 548
 549         return err;
 550 }
 551
 552
 553 static int et61x251_stop_transfer(struct et61x251_device* cam)
 554 {
 555         struct usb_device *udev = cam->usbdev;
 556         s8 i;
 557         int err = 0;
 558
 559         if (cam->state & DEV_DISCONNECTED)
 560                 return 0;
 561
 562         for (i = ET61X251_URBS-1; i >= 0; i--) {
 563                 usb_kill_urb(cam->urb[i]);
 564                 usb_free_urb(cam->urb[i]);
 565                 kfree(cam->transfer_buffer[i]);
 566         }
 567
 568         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 569         if (err)
 570                 DBG(3, "usb_set_interface() failed");
 571
 572         return err;
 573 }
 574
 575
 576 static int et61x251_stream_interrupt(struct et61x251_device* cam)
 577 {
 578         long timeout;
 579
 580         cam->stream = STREAM_INTERRUPT;
 581         timeout = wait_event_timeout(cam->wait_stream,
 582                                      (cam->stream == STREAM_OFF) ||
 583                                      (cam->state & DEV_DISCONNECTED),
 584                                      ET61X251_URB_TIMEOUT);
 585         if (cam->state & DEV_DISCONNECTED)
 586                 return -ENODEV;
 587         else if (cam->stream != STREAM_OFF) {
 588                 cam->state |= DEV_MISCONFIGURED;
 589                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
 590                        "use it, close and open /dev/video%d again.",
 591                     cam->v4ldev->num);
 592                 return -EIO;
 593         }
 594
 595         return 0;
 596 }
 597
 598 /*****************************************************************************/
 599
 600 #ifdef CONFIG_VIDEO_ADV_DEBUG
 601
 602 static int et61x251_i2c_try_read(struct et61x251_device* cam,
 603                                  const struct et61x251_sensor* sensor,
 604                                  u8 address)
 605 {
 606         struct usb_device* udev = cam->usbdev;
 607         u8* data = cam->control_buffer;
 608         int err = 0, res;
 609
 610         data[0] = address;
 611         data[1] = cam->sensor.i2c_slave_id;
 612         data[2] = cam->sensor.rsta | 0x10;
 613         data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
 614         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 615                               0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
 616         if (res < 0)
 617                 err += res;
 618
 619         err += et61x251_i2c_wait(cam, sensor);
 620
 621         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 622                               0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
 623         if (res < 0)
 624                 err += res;
 625
 626         if (err)
 627                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 628
 629         PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
 630
 631         return err ? -1 : (int)data[0];
 632 }
 633
 634
 635 static int et61x251_i2c_try_write(struct et61x251_device* cam,
 636                                   const struct et61x251_sensor* sensor,
 637                                   u8 address, u8 value)
 638 {
 639         struct usb_device* udev = cam->usbdev;
 640         u8* data = cam->control_buffer;
 641         int err = 0, res;
 642
 643         data[0] = address;
 644         data[1] = cam->sensor.i2c_slave_id;
 645         data[2] = cam->sensor.rsta | 0x12;
 646         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 647                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 648         if (res < 0)
 649                 err += res;
 650
 651         data[0] = value;
 652         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 653                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 654         if (res < 0)
 655                 err += res;
 656
 657         err += et61x251_i2c_wait(cam, sensor);
 658
 659         if (err)
 660                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 661
 662         PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
 663
 664         return err ? -1 : 0;
 665 }
 666
 667 static int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
 668 {
 669         return et61x251_i2c_try_read(cam, &cam->sensor, address);
 670 }
 671
 672 static int et61x251_i2c_write(struct et61x251_device* cam,
 673                               u8 address, u8 value)
 674 {
 675         return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
 676 }
 677
 678 static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
 679 {
 680         char str[5];
 681         char* endp;
 682         unsigned long val;
 683
 684         if (len < 4) {
 685                 strncpy(str, buff, len);
 686                 str[len] = '\0';
 687         } else {
 688                 strncpy(str, buff, 4);
 689                 str[4] = '\0';
 690         }
 691
 692         val = simple_strtoul(str, &endp, 0);
 693
 694         *count = 0;
 695         if (val <= 0xff)
 696                 *count = (ssize_t)(endp - str);
 697         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 698                 *count += 1;
 699
 700         return (u8)val;
 701 }
 702
 703 /*
 704    NOTE 1: being inside one of the following methods implies that the v4l
 705            device exists for sure (see kobjects and reference counters)
 706    NOTE 2: buffers are PAGE_SIZE long
 707 */
 708
 709 static ssize_t et61x251_show_reg(struct device* cd,
 710                                  struct device_attribute *attr, char* buf)
 711 {
 712         struct et61x251_device* cam;
 713         ssize_t count;
 714
 715         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 716                 return -ERESTARTSYS;
 717
 718         cam = video_get_drvdata(to_video_device(cd));
 719         if (!cam) {
 720                 mutex_unlock(&et61x251_sysfs_lock);
 721                 return -ENODEV;
 722         }
 723
 724         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 725
 726         mutex_unlock(&et61x251_sysfs_lock);
 727
 728         return count;
 729 }
 730
 731
 732 static ssize_t
 733 et61x251_store_reg(struct device* cd,
 734                    struct device_attribute *attr, const char* buf, size_t len)
 735 {
 736         struct et61x251_device* cam;
 737         u8 index;
 738         ssize_t count;
 739
 740         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 741                 return -ERESTARTSYS;
 742
 743         cam = video_get_drvdata(to_video_device(cd));
 744         if (!cam) {
 745                 mutex_unlock(&et61x251_sysfs_lock);
 746                 return -ENODEV;
 747         }
 748
 749         index = et61x251_strtou8(buf, len, &count);
 750         if (index > 0x8e || !count) {
 751                 mutex_unlock(&et61x251_sysfs_lock);
 752                 return -EINVAL;
 753         }
 754
 755         cam->sysfs.reg = index;
 756
 757         DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
 758         DBG(3, "Written bytes: %zd", count);
 759
 760         mutex_unlock(&et61x251_sysfs_lock);
 761
 762         return count;
 763 }
 764
 765
 766 static ssize_t et61x251_show_val(struct device* cd,
 767                                  struct device_attribute *attr, char* buf)
 768 {
 769         struct et61x251_device* cam;
 770         ssize_t count;
 771         int val;
 772
 773         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 774                 return -ERESTARTSYS;
 775
 776         cam = video_get_drvdata(to_video_device(cd));
 777         if (!cam) {
 778                 mutex_unlock(&et61x251_sysfs_lock);
 779                 return -ENODEV;
 780         }
 781
 782         if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
 783                 mutex_unlock(&et61x251_sysfs_lock);
 784                 return -EIO;
 785         }
 786
 787         count = sprintf(buf, "%d\n", val);
 788
 789         DBG(3, "Read bytes: %zd", count);
 790
 791         mutex_unlock(&et61x251_sysfs_lock);
 792
 793         return count;
 794 }
 795
 796
 797 static ssize_t
 798 et61x251_store_val(struct device* cd, struct device_attribute *attr,
 799                    const char* buf, size_t len)
 800 {
 801         struct et61x251_device* cam;
 802         u8 value;
 803         ssize_t count;
 804         int err;
 805
 806         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 807                 return -ERESTARTSYS;
 808
 809         cam = video_get_drvdata(to_video_device(cd));
 810         if (!cam) {
 811                 mutex_unlock(&et61x251_sysfs_lock);
 812                 return -ENODEV;
 813         }
 814
 815         value = et61x251_strtou8(buf, len, &count);
 816         if (!count) {
 817                 mutex_unlock(&et61x251_sysfs_lock);
 818                 return -EINVAL;
 819         }
 820
 821         err = et61x251_write_reg(cam, value, cam->sysfs.reg);
 822         if (err) {
 823                 mutex_unlock(&et61x251_sysfs_lock);
 824                 return -EIO;
 825         }
 826
 827         DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
 828             cam->sysfs.reg, value);
 829         DBG(3, "Written bytes: %zd", count);
 830
 831         mutex_unlock(&et61x251_sysfs_lock);
 832
 833         return count;
 834 }
 835
 836
 837 static ssize_t et61x251_show_i2c_reg(struct device* cd,
 838                                      struct device_attribute *attr, char* buf)
 839 {
 840         struct et61x251_device* cam;
 841         ssize_t count;
 842
 843         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 844                 return -ERESTARTSYS;
 845
 846         cam = video_get_drvdata(to_video_device(cd));
 847         if (!cam) {
 848                 mutex_unlock(&et61x251_sysfs_lock);
 849                 return -ENODEV;
 850         }
 851
 852         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
 853
 854         DBG(3, "Read bytes: %zd", count);
 855
 856         mutex_unlock(&et61x251_sysfs_lock);
 857
 858         return count;
 859 }
 860
 861
 862 static ssize_t
 863 et61x251_store_i2c_reg(struct device* cd, struct device_attribute *attr,
 864                        const char* buf, size_t len)
 865 {
 866         struct et61x251_device* cam;
 867         u8 index;
 868         ssize_t count;
 869
 870         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 871                 return -ERESTARTSYS;
 872
 873         cam = video_get_drvdata(to_video_device(cd));
 874         if (!cam) {
 875                 mutex_unlock(&et61x251_sysfs_lock);
 876                 return -ENODEV;
 877         }
 878
 879         index = et61x251_strtou8(buf, len, &count);
 880         if (!count) {
 881                 mutex_unlock(&et61x251_sysfs_lock);
 882                 return -EINVAL;
 883         }
 884
 885         cam->sysfs.i2c_reg = index;
 886
 887         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
 888         DBG(3, "Written bytes: %zd", count);
 889
 890         mutex_unlock(&et61x251_sysfs_lock);
 891
 892         return count;
 893 }
 894
 895
 896 static ssize_t et61x251_show_i2c_val(struct device* cd,
 897                                      struct device_attribute *attr, char* buf)
 898 {
 899         struct et61x251_device* cam;
 900         ssize_t count;
 901         int val;
 902
 903         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 904                 return -ERESTARTSYS;
 905
 906         cam = video_get_drvdata(to_video_device(cd));
 907         if (!cam) {
 908                 mutex_unlock(&et61x251_sysfs_lock);
 909                 return -ENODEV;
 910         }
 911
 912         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 913                 mutex_unlock(&et61x251_sysfs_lock);
 914                 return -ENOSYS;
 915         }
 916
 917         if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
 918                 mutex_unlock(&et61x251_sysfs_lock);
 919                 return -EIO;
 920         }
 921
 922         count = sprintf(buf, "%d\n", val);
 923
 924         DBG(3, "Read bytes: %zd", count);
 925
 926         mutex_unlock(&et61x251_sysfs_lock);
 927
 928         return count;
 929 }
 930
 931
 932 static ssize_t
 933 et61x251_store_i2c_val(struct device* cd, struct device_attribute *attr,
 934                        const char* buf, size_t len)
 935 {
 936         struct et61x251_device* cam;
 937         u8 value;
 938         ssize_t count;
 939         int err;
 940
 941         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 942                 return -ERESTARTSYS;
 943
 944         cam = video_get_drvdata(to_video_device(cd));
 945         if (!cam) {
 946                 mutex_unlock(&et61x251_sysfs_lock);
 947                 return -ENODEV;
 948         }
 949
 950         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 951                 mutex_unlock(&et61x251_sysfs_lock);
 952                 return -ENOSYS;
 953         }
 954
 955         value = et61x251_strtou8(buf, len, &count);
 956         if (!count) {
 957                 mutex_unlock(&et61x251_sysfs_lock);
 958                 return -EINVAL;
 959         }
 960
 961         err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
 962         if (err) {
 963                 mutex_unlock(&et61x251_sysfs_lock);
 964                 return -EIO;
 965         }
 966
 967         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
 968             cam->sysfs.i2c_reg, value);
 969         DBG(3, "Written bytes: %zd", count);
 970
 971         mutex_unlock(&et61x251_sysfs_lock);
 972
 973         return count;
 974 }
 975
 976
 977 static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
 978                    et61x251_show_reg, et61x251_store_reg);
 979 static DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
 980                    et61x251_show_val, et61x251_store_val);
 981 static DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
 982                    et61x251_show_i2c_reg, et61x251_store_i2c_reg);
 983 static DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
 984                    et61x251_show_i2c_val, et61x251_store_i2c_val);
 985
 986
 987 static int et61x251_create_sysfs(struct et61x251_device* cam)
 988 {
 989         struct device *classdev = &(cam->v4ldev->dev);
 990         int err = 0;
 991
 992         if ((err = device_create_file(classdev, &dev_attr_reg)))
 993                 goto err_out;
 994         if ((err = device_create_file(classdev, &dev_attr_val)))
 995                 goto err_reg;
 996
 997         if (cam->sensor.sysfs_ops) {
 998                 if ((err = device_create_file(classdev, &dev_attr_i2c_reg)))
 999                         goto err_val;
1000                 if ((err = device_create_file(classdev, &dev_attr_i2c_val)))
1001                         goto err_i2c_reg;
1002         }
1003
1004 err_i2c_reg:
1005         if (cam->sensor.sysfs_ops)
1006                 device_remove_file(classdev, &dev_attr_i2c_reg);
1007 err_val:
1008         device_remove_file(classdev, &dev_attr_val);
1009 err_reg:
1010         device_remove_file(classdev, &dev_attr_reg);
1011 err_out:
1012         return err;
1013 }
1014 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1015
1016 /*****************************************************************************/
1017
1018 static int
1019 et61x251_set_pix_format(struct et61x251_device* cam,
1020                         struct v4l2_pix_format* pix)
1021 {
1022         int r, err = 0;
1023
1024         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1025                 err += r;
1026         if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1027                 err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1028         else
1029                 err += et61x251_write_reg(cam, r | 0x02, 0x12);
1030
1031         return err ? -EIO : 0;
1032 }
1033
1034
1035 static int
1036 et61x251_set_compression(struct et61x251_device* cam,
1037                          struct v4l2_jpegcompression* compression)
1038 {
1039         int r, err = 0;
1040
1041         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1042                 err += r;
1043         if (compression->quality == 0)
1044                 err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1045         else
1046                 err += et61x251_write_reg(cam, r | 0x04, 0x12);
1047
1048         return err ? -EIO : 0;
1049 }
1050
1051
1052 static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1053 {
1054         int r = 0, err = 0;
1055
1056         r = et61x251_read_reg(cam, 0x12);
1057         if (r < 0)
1058                 err += r;
1059
1060         if (scale == 1)
1061                 err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1062         else if (scale == 2)
1063                 err += et61x251_write_reg(cam, r | 0x01, 0x12);
1064
1065         if (err)
1066                 return -EIO;
1067
1068         PDBGG("Scaling factor: %u", scale);
1069
1070         return 0;
1071 }
1072
1073
1074 static int
1075 et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1076 {
1077         struct et61x251_sensor* s = &cam->sensor;
1078         u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1079                            s->active_pixel.left),
1080             fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1081                            s->active_pixel.top),
1082             fmw_length = (u16)(rect->width),
1083             fmw_height = (u16)(rect->height);
1084         int err = 0;
1085
1086         err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1087         err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1088         err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1089         err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1090         err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1091                                        | ((fmw_length & 0x300) >> 4)
1092                                        | ((fmw_height & 0x300) >> 2), 0x6d);
1093         if (err)
1094                 return -EIO;
1095
1096         PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1097               fmw_sx, fmw_sy, fmw_length, fmw_height);
1098
1099         return 0;
1100 }
1101
1102
1103 static int et61x251_init(struct et61x251_device* cam)
1104 {
1105         struct et61x251_sensor* s = &cam->sensor;
1106         struct v4l2_control ctrl;
1107         struct v4l2_queryctrl *qctrl;
1108         struct v4l2_rect* rect;
1109         u8 i = 0;
1110         int err = 0;
1111
1112         if (!(cam->state & DEV_INITIALIZED)) {
1113                 mutex_init(&cam->open_mutex);
1114                 init_waitqueue_head(&cam->wait_open);
1115                 qctrl = s->qctrl;
1116                 rect = &(s->cropcap.defrect);
1117                 cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1118         } else { /* use current values */
1119                 qctrl = s->_qctrl;
1120                 rect = &(s->_rect);
1121         }
1122
1123         err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1124         err += et61x251_set_crop(cam, rect);
1125         if (err)
1126                 return err;
1127
1128         if (s->init) {
1129                 err = s->init(cam);
1130                 if (err) {
1131                         DBG(3, "Sensor initialization failed");
1132                         return err;
1133                 }
1134         }
1135
1136         err += et61x251_set_compression(cam, &cam->compression);
1137         err += et61x251_set_pix_format(cam, &s->pix_format);
1138         if (s->set_pix_format)
1139                 err += s->set_pix_format(cam, &s->pix_format);
1140         if (err)
1141                 return err;
1142
1143         if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1144                 DBG(3, "Compressed video format is active, quality %d",
1145                     cam->compression.quality);
1146         else
1147                 DBG(3, "Uncompressed video format is active");
1148
1149         if (s->set_crop)
1150                 if ((err = s->set_crop(cam, rect))) {
1151                         DBG(3, "set_crop() failed");
1152                         return err;
1153                 }
1154
1155         if (s->set_ctrl) {
1156                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1157                         if (s->qctrl[i].id != 0 &&
1158                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1159                                 ctrl.id = s->qctrl[i].id;
1160                                 ctrl.value = qctrl[i].default_value;
1161                                 err = s->set_ctrl(cam, &ctrl);
1162                                 if (err) {
1163                                         DBG(3, "Set %s control failed",
1164                                             s->qctrl[i].name);
1165                                         return err;
1166                                 }
1167                                 DBG(3, "Image sensor supports '%s' control",
1168                                     s->qctrl[i].name);
1169                         }
1170         }
1171
1172         if (!(cam->state & DEV_INITIALIZED)) {
1173                 mutex_init(&cam->fileop_mutex);
1174                 spin_lock_init(&cam->queue_lock);
1175                 init_waitqueue_head(&cam->wait_frame);
1176                 init_waitqueue_head(&cam->wait_stream);
1177                 cam->nreadbuffers = 2;
1178                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1179                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1180                        sizeof(struct v4l2_rect));
1181                 cam->state |= DEV_INITIALIZED;
1182         }
1183
1184         DBG(2, "Initialization succeeded");
1185         return 0;
1186 }
1187
1188 /*****************************************************************************/
1189
1190 static void et61x251_release_resources(struct kref *kref)
1191 {
1192         struct et61x251_device *cam;
1193
1194         mutex_lock(&et61x251_sysfs_lock);
1195
1196         cam = container_of(kref, struct et61x251_device, kref);
1197
1198         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->num);
1199         video_set_drvdata(cam->v4ldev, NULL);
1200         video_unregister_device(cam->v4ldev);
1201         usb_put_dev(cam->usbdev);
1202         kfree(cam->control_buffer);
1203         kfree(cam);
1204
1205         mutex_unlock(&et61x251_sysfs_lock);
1206 }
1207
1208
1209 static int et61x251_open(struct file *filp)
1210 {
1211         struct et61x251_device* cam;
1212         int err = 0;
1213
1214         if (!down_read_trylock(&et61x251_dev_lock))
1215                 return -ERESTARTSYS;
1216
1217         cam = video_drvdata(filp);
1218
1219         if (wait_for_completion_interruptible(&cam->probe)) {
1220                 up_read(&et61x251_dev_lock);
1221                 return -ERESTARTSYS;
1222         }
1223
1224         kref_get(&cam->kref);
1225
1226         if (mutex_lock_interruptible(&cam->open_mutex)) {
1227                 kref_put(&cam->kref, et61x251_release_resources);
1228                 up_read(&et61x251_dev_lock);
1229                 return -ERESTARTSYS;
1230         }
1231
1232         if (cam->state & DEV_DISCONNECTED) {
1233                 DBG(1, "Device not present");
1234                 err = -ENODEV;
1235                 goto out;
1236         }
1237
1238         if (cam->users) {
1239                 DBG(2, "Device /dev/video%d is already in use",
1240                        cam->v4ldev->num);
1241                 DBG(3, "Simultaneous opens are not supported");
1242                 if ((filp->f_flags & O_NONBLOCK) ||
1243                     (filp->f_flags & O_NDELAY)) {
1244                         err = -EWOULDBLOCK;
1245                         goto out;
1246                 }
1247                 DBG(2, "A blocking open() has been requested. Wait for the "
1248                        "device to be released...");
1249                 up_read(&et61x251_dev_lock);
1250                 err = wait_event_interruptible_exclusive(cam->wait_open,
1251                                                 (cam->state & DEV_DISCONNECTED)
1252                                                          || !cam->users);
1253                 down_read(&et61x251_dev_lock);
1254                 if (err)
1255                         goto out;
1256                 if (cam->state & DEV_DISCONNECTED) {
1257                         err = -ENODEV;
1258                         goto out;
1259                 }
1260         }
1261
1262         if (cam->state & DEV_MISCONFIGURED) {
1263                 err = et61x251_init(cam);
1264                 if (err) {
1265                         DBG(1, "Initialization failed again. "
1266                                "I will retry on next open().");
1267                         goto out;
1268                 }
1269                 cam->state &= ~DEV_MISCONFIGURED;
1270         }
1271
1272         if ((err = et61x251_start_transfer(cam)))
1273                 goto out;
1274
1275         filp->private_data = cam;
1276         cam->users++;
1277         cam->io = IO_NONE;
1278         cam->stream = STREAM_OFF;
1279         cam->nbuffers = 0;
1280         cam->frame_count = 0;
1281         et61x251_empty_framequeues(cam);
1282
1283         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->num);
1284
1285 out:
1286         mutex_unlock(&cam->open_mutex);
1287         if (err)
1288                 kref_put(&cam->kref, et61x251_release_resources);
1289         up_read(&et61x251_dev_lock);
1290         return err;
1291 }
1292
1293
1294 static int et61x251_release(struct file *filp)
1295 {
1296         struct et61x251_device* cam;
1297
1298         down_write(&et61x251_dev_lock);
1299
1300         cam = video_drvdata(filp);
1301
1302         et61x251_stop_transfer(cam);
1303         et61x251_release_buffers(cam);
1304         cam->users--;
1305         wake_up_interruptible_nr(&cam->wait_open, 1);
1306
1307         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->num);
1308
1309         kref_put(&cam->kref, et61x251_release_resources);
1310
1311         up_write(&et61x251_dev_lock);
1312
1313         return 0;
1314 }
1315
1316
1317 static ssize_t
1318 et61x251_read(struct file* filp, char __user * buf,
1319               size_t count, loff_t* f_pos)
1320 {
1321         struct et61x251_device *cam = video_drvdata(filp);
1322         struct et61x251_frame_t* f, * i;
1323         unsigned long lock_flags;
1324         long timeout;
1325         int err = 0;
1326
1327         if (mutex_lock_interruptible(&cam->fileop_mutex))
1328                 return -ERESTARTSYS;
1329
1330         if (cam->state & DEV_DISCONNECTED) {
1331                 DBG(1, "Device not present");
1332                 mutex_unlock(&cam->fileop_mutex);
1333                 return -ENODEV;
1334         }
1335
1336         if (cam->state & DEV_MISCONFIGURED) {
1337                 DBG(1, "The camera is misconfigured. Close and open it "
1338                        "again.");
1339                 mutex_unlock(&cam->fileop_mutex);
1340                 return -EIO;
1341         }
1342
1343         if (cam->io == IO_MMAP) {
1344                 DBG(3, "Close and open the device again to choose the read "
1345                        "method");
1346                 mutex_unlock(&cam->fileop_mutex);
1347                 return -EBUSY;
1348         }
1349
1350         if (cam->io == IO_NONE) {
1351                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1352                                               IO_READ)) {
1353                         DBG(1, "read() failed, not enough memory");
1354                         mutex_unlock(&cam->fileop_mutex);
1355                         return -ENOMEM;
1356                 }
1357                 cam->io = IO_READ;
1358                 cam->stream = STREAM_ON;
1359         }
1360
1361         if (list_empty(&cam->inqueue)) {
1362                 if (!list_empty(&cam->outqueue))
1363                         et61x251_empty_framequeues(cam);
1364                 et61x251_queue_unusedframes(cam);
1365         }
1366
1367         if (!count) {
1368                 mutex_unlock(&cam->fileop_mutex);
1369                 return 0;
1370         }
1371
1372         if (list_empty(&cam->outqueue)) {
1373                 if (filp->f_flags & O_NONBLOCK) {
1374                         mutex_unlock(&cam->fileop_mutex);
1375                         return -EAGAIN;
1376                 }
1377                 timeout = wait_event_interruptible_timeout
1378                           ( cam->wait_frame,
1379                             (!list_empty(&cam->outqueue)) ||
1380                             (cam->state & DEV_DISCONNECTED) ||
1381                             (cam->state & DEV_MISCONFIGURED),
1382                             msecs_to_jiffies(
1383                                 cam->module_param.frame_timeout * 1000
1384                             )
1385                           );
1386                 if (timeout < 0) {
1387                         mutex_unlock(&cam->fileop_mutex);
1388                         return timeout;
1389                 }
1390                 if (cam->state & DEV_DISCONNECTED) {
1391                         mutex_unlock(&cam->fileop_mutex);
1392                         return -ENODEV;
1393                 }
1394                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1395                         mutex_unlock(&cam->fileop_mutex);
1396                         return -EIO;
1397                 }
1398         }
1399
1400         f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1401
1402         if (count > f->buf.bytesused)
1403                 count = f->buf.bytesused;
1404
1405         if (copy_to_user(buf, f->bufmem, count)) {
1406                 err = -EFAULT;
1407                 goto exit;
1408         }
1409         *f_pos += count;
1410
1411 exit:
1412         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1413         list_for_each_entry(i, &cam->outqueue, frame)
1414                 i->state = F_UNUSED;
1415         INIT_LIST_HEAD(&cam->outqueue);
1416         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1417
1418         et61x251_queue_unusedframes(cam);
1419
1420         PDBGG("Frame #%lu, bytes read: %zu",
1421               (unsigned long)f->buf.index, count);
1422
1423         mutex_unlock(&cam->fileop_mutex);
1424
1425         return err ? err : count;
1426 }
1427
1428
1429 static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1430 {
1431         struct et61x251_device *cam = video_drvdata(filp);
1432         struct et61x251_frame_t* f;
1433         unsigned long lock_flags;
1434         unsigned int mask = 0;
1435
1436         if (mutex_lock_interruptible(&cam->fileop_mutex))
1437                 return POLLERR;
1438
1439         if (cam->state & DEV_DISCONNECTED) {
1440                 DBG(1, "Device not present");
1441                 goto error;
1442         }
1443
1444         if (cam->state & DEV_MISCONFIGURED) {
1445                 DBG(1, "The camera is misconfigured. Close and open it "
1446                        "again.");
1447                 goto error;
1448         }
1449
1450         if (cam->io == IO_NONE) {
1451                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1452                                               IO_READ)) {
1453                         DBG(1, "poll() failed, not enough memory");
1454                         goto error;
1455                 }
1456                 cam->io = IO_READ;
1457                 cam->stream = STREAM_ON;
1458         }
1459
1460         if (cam->io == IO_READ) {
1461                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1462                 list_for_each_entry(f, &cam->outqueue, frame)
1463                         f->state = F_UNUSED;
1464                 INIT_LIST_HEAD(&cam->outqueue);
1465                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1466                 et61x251_queue_unusedframes(cam);
1467         }
1468
1469         poll_wait(filp, &cam->wait_frame, wait);
1470
1471         if (!list_empty(&cam->outqueue))
1472                 mask |= POLLIN | POLLRDNORM;
1473
1474         mutex_unlock(&cam->fileop_mutex);
1475
1476         return mask;
1477
1478 error:
1479         mutex_unlock(&cam->fileop_mutex);
1480         return POLLERR;
1481 }
1482
1483
1484 static void et61x251_vm_open(struct vm_area_struct* vma)
1485 {
1486         struct et61x251_frame_t* f = vma->vm_private_data;
1487         f->vma_use_count++;
1488 }
1489
1490
1491 static void et61x251_vm_close(struct vm_area_struct* vma)
1492 {
1493         /* NOTE: buffers are not freed here */
1494         struct et61x251_frame_t* f = vma->vm_private_data;
1495         f->vma_use_count--;
1496 }
1497
1498
1499 static const struct vm_operations_struct et61x251_vm_ops = {
1500         .open = et61x251_vm_open,
1501         .close = et61x251_vm_close,
1502 };
1503
1504
1505 static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1506 {
1507         struct et61x251_device *cam = video_drvdata(filp);
1508         unsigned long size = vma->vm_end - vma->vm_start,
1509                       start = vma->vm_start;
1510         void *pos;
1511         u32 i;
1512
1513         if (mutex_lock_interruptible(&cam->fileop_mutex))
1514                 return -ERESTARTSYS;
1515
1516         if (cam->state & DEV_DISCONNECTED) {
1517                 DBG(1, "Device not present");
1518                 mutex_unlock(&cam->fileop_mutex);
1519                 return -ENODEV;
1520         }
1521
1522         if (cam->state & DEV_MISCONFIGURED) {
1523                 DBG(1, "The camera is misconfigured. Close and open it "
1524                        "again.");
1525                 mutex_unlock(&cam->fileop_mutex);
1526                 return -EIO;
1527         }
1528
1529         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
1530                 mutex_unlock(&cam->fileop_mutex);
1531                 return -EACCES;
1532         }
1533
1534         if (cam->io != IO_MMAP ||
1535             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1536                 mutex_unlock(&cam->fileop_mutex);
1537                 return -EINVAL;
1538         }
1539
1540         for (i = 0; i < cam->nbuffers; i++) {
1541                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1542                         break;
1543         }
1544         if (i == cam->nbuffers) {
1545                 mutex_unlock(&cam->fileop_mutex);
1546                 return -EINVAL;
1547         }
1548
1549         vma->vm_flags |= VM_IO;
1550         vma->vm_flags |= VM_RESERVED;
1551
1552         pos = cam->frame[i].bufmem;
1553         while (size > 0) { /* size is page-aligned */
1554                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1555                         mutex_unlock(&cam->fileop_mutex);
1556                         return -EAGAIN;
1557                 }
1558                 start += PAGE_SIZE;
1559                 pos += PAGE_SIZE;
1560                 size -= PAGE_SIZE;
1561         }
1562
1563         vma->vm_ops = &et61x251_vm_ops;
1564         vma->vm_private_data = &cam->frame[i];
1565         et61x251_vm_open(vma);
1566
1567         mutex_unlock(&cam->fileop_mutex);
1568
1569         return 0;
1570 }
1571
1572 /*****************************************************************************/
1573
1574 static int
1575 et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1576 {
1577         struct v4l2_capability cap = {
1578                 .driver = "et61x251",
1579                 .version = ET61X251_MODULE_VERSION_CODE,
1580                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1581                                 V4L2_CAP_STREAMING,
1582         };
1583
1584         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1585         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1586                 strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
1587                         sizeof(cap.bus_info));
1588
1589         if (copy_to_user(arg, &cap, sizeof(cap)))
1590                 return -EFAULT;
1591
1592         return 0;
1593 }
1594
1595
1596 static int
1597 et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1598 {
1599         struct v4l2_input i;
1600
1601         if (copy_from_user(&i, arg, sizeof(i)))
1602                 return -EFAULT;
1603
1604         if (i.index)
1605                 return -EINVAL;
1606
1607         memset(&i, 0, sizeof(i));
1608         strcpy(i.name, "Camera");
1609         i.type = V4L2_INPUT_TYPE_CAMERA;
1610
1611         if (copy_to_user(arg, &i, sizeof(i)))
1612                 return -EFAULT;
1613
1614         return 0;
1615 }
1616
1617
1618 static int
1619 et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1620 {
1621         int index = 0;
1622
1623         if (copy_to_user(arg, &index, sizeof(index)))
1624                 return -EFAULT;
1625
1626         return 0;
1627 }
1628
1629
1630 static int
1631 et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1632 {
1633         int index;
1634
1635         if (copy_from_user(&index, arg, sizeof(index)))
1636                 return -EFAULT;
1637
1638         if (index != 0)
1639                 return -EINVAL;
1640
1641         return 0;
1642 }
1643
1644
1645 static int
1646 et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1647 {
1648         struct et61x251_sensor* s = &cam->sensor;
1649         struct v4l2_queryctrl qc;
1650         u8 i;
1651
1652         if (copy_from_user(&qc, arg, sizeof(qc)))
1653                 return -EFAULT;
1654
1655         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1656                 if (qc.id && qc.id == s->qctrl[i].id) {
1657                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1658                         if (copy_to_user(arg, &qc, sizeof(qc)))
1659                                 return -EFAULT;
1660                         return 0;
1661                 }
1662
1663         return -EINVAL;
1664 }
1665
1666
1667 static int
1668 et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1669 {
1670         struct et61x251_sensor* s = &cam->sensor;
1671         struct v4l2_control ctrl;
1672         int err = 0;
1673         u8 i;
1674
1675         if (!s->get_ctrl && !s->set_ctrl)
1676                 return -EINVAL;
1677
1678         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1679                 return -EFAULT;
1680
1681         if (!s->get_ctrl) {
1682                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1683                         if (ctrl.id == s->qctrl[i].id) {
1684                                 ctrl.value = s->_qctrl[i].default_value;
1685                                 goto exit;
1686                         }
1687                 return -EINVAL;
1688         } else
1689                 err = s->get_ctrl(cam, &ctrl);
1690
1691 exit:
1692         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1693                 return -EFAULT;
1694
1695         return err;
1696 }
1697
1698
1699 static int
1700 et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1701 {
1702         struct et61x251_sensor* s = &cam->sensor;
1703         struct v4l2_control ctrl;
1704         u8 i;
1705         int err = 0;
1706
1707         if (!s->set_ctrl)
1708                 return -EINVAL;
1709
1710         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1711                 return -EFAULT;
1712
1713         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1714                 if (ctrl.id == s->qctrl[i].id) {
1715                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1716                                 return -EINVAL;
1717                         if (ctrl.value < s->qctrl[i].minimum ||
1718                             ctrl.value > s->qctrl[i].maximum)
1719                                 return -ERANGE;
1720                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1721                         break;
1722                 }
1723
1724         if ((err = s->set_ctrl(cam, &ctrl)))
1725                 return err;
1726
1727         s->_qctrl[i].default_value = ctrl.value;
1728
1729         return 0;
1730 }
1731
1732
1733 static int
1734 et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1735 {
1736         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1737
1738         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1739         cc->pixelaspect.numerator = 1;
1740         cc->pixelaspect.denominator = 1;
1741
1742         if (copy_to_user(arg, cc, sizeof(*cc)))
1743                 return -EFAULT;
1744
1745         return 0;
1746 }
1747
1748
1749 static int
1750 et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1751 {
1752         struct et61x251_sensor* s = &cam->sensor;
1753         struct v4l2_crop crop = {
1754                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1755         };
1756
1757         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1758
1759         if (copy_to_user(arg, &crop, sizeof(crop)))
1760                 return -EFAULT;
1761
1762         return 0;
1763 }
1764
1765
1766 static int
1767 et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1768 {
1769         struct et61x251_sensor* s = &cam->sensor;
1770         struct v4l2_crop crop;
1771         struct v4l2_rect* rect;
1772         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1773         struct v4l2_pix_format* pix_format = &(s->pix_format);
1774         u8 scale;
1775         const enum et61x251_stream_state stream = cam->stream;
1776         const u32 nbuffers = cam->nbuffers;
1777         u32 i;
1778         int err = 0;
1779
1780         if (copy_from_user(&crop, arg, sizeof(crop)))
1781                 return -EFAULT;
1782
1783         rect = &(crop.c);
1784
1785         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1786                 return -EINVAL;
1787
1788         if (cam->module_param.force_munmap)
1789                 for (i = 0; i < cam->nbuffers; i++)
1790                         if (cam->frame[i].vma_use_count) {
1791                                 DBG(3, "VIDIOC_S_CROP failed. "
1792                                        "Unmap the buffers first.");
1793                                 return -EBUSY;
1794                         }
1795
1796         /* Preserve R,G or B origin */
1797         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1798         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1799
1800         if (rect->width < 16)
1801                 rect->width = 16;
1802         if (rect->height < 16)
1803                 rect->height = 16;
1804         if (rect->width > bounds->width)
1805                 rect->width = bounds->width;
1806         if (rect->height > bounds->height)
1807                 rect->height = bounds->height;
1808         if (rect->left < bounds->left)
1809                 rect->left = bounds->left;
1810         if (rect->top < bounds->top)
1811                 rect->top = bounds->top;
1812         if (rect->left + rect->width > bounds->left + bounds->width)
1813                 rect->left = bounds->left+bounds->width - rect->width;
1814         if (rect->top + rect->height > bounds->top + bounds->height)
1815                 rect->top = bounds->top+bounds->height - rect->height;
1816
1817         rect->width &= ~15L;
1818         rect->height &= ~15L;
1819
1820         if (ET61X251_PRESERVE_IMGSCALE) {
1821                 /* Calculate the actual scaling factor */
1822                 u32 a, b;
1823                 a = rect->width * rect->height;
1824                 b = pix_format->width * pix_format->height;
1825                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1826         } else
1827                 scale = 1;
1828
1829         if (cam->stream == STREAM_ON)
1830                 if ((err = et61x251_stream_interrupt(cam)))
1831                         return err;
1832
1833         if (copy_to_user(arg, &crop, sizeof(crop))) {
1834                 cam->stream = stream;
1835                 return -EFAULT;
1836         }
1837
1838         if (cam->module_param.force_munmap || cam->io == IO_READ)
1839                 et61x251_release_buffers(cam);
1840
1841         err = et61x251_set_crop(cam, rect);
1842         if (s->set_crop)
1843                 err += s->set_crop(cam, rect);
1844         err += et61x251_set_scale(cam, scale);
1845
1846         if (err) { /* atomic, no rollback in ioctl() */
1847                 cam->state |= DEV_MISCONFIGURED;
1848                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1849                        "use the camera, close and open /dev/video%d again.",
1850                     cam->v4ldev->num);
1851                 return -EIO;
1852         }
1853
1854         s->pix_format.width = rect->width/scale;
1855         s->pix_format.height = rect->height/scale;
1856         memcpy(&(s->_rect), rect, sizeof(*rect));
1857
1858         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1859             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1860                 cam->state |= DEV_MISCONFIGURED;
1861                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1862                        "use the camera, close and open /dev/video%d again.",
1863                     cam->v4ldev->num);
1864                 return -ENOMEM;
1865         }
1866
1867         if (cam->io == IO_READ)
1868                 et61x251_empty_framequeues(cam);
1869         else if (cam->module_param.force_munmap)
1870                 et61x251_requeue_outqueue(cam);
1871
1872         cam->stream = stream;
1873
1874         return 0;
1875 }
1876
1877
1878 static int
1879 et61x251_vidioc_enum_framesizes(struct et61x251_device* cam, void __user * arg)
1880 {
1881         struct v4l2_frmsizeenum frmsize;
1882
1883         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1884                 return -EFAULT;
1885
1886         if (frmsize.index != 0)
1887                 return -EINVAL;
1888
1889         if (frmsize.pixel_format != V4L2_PIX_FMT_ET61X251 &&
1890             frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
1891                 return -EINVAL;
1892
1893         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
1894         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
1895         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
1896         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
1897         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
1898         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1899
1900         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1901                 return -EFAULT;
1902
1903         return 0;
1904 }
1905
1906
1907 static int
1908 et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1909 {
1910         struct v4l2_fmtdesc fmtd;
1911
1912         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1913                 return -EFAULT;
1914
1915         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1916                 return -EINVAL;
1917
1918         if (fmtd.index == 0) {
1919                 strcpy(fmtd.description, "bayer rgb");
1920                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1921         } else if (fmtd.index == 1) {
1922                 strcpy(fmtd.description, "compressed");
1923                 fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1924                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1925         } else
1926                 return -EINVAL;
1927
1928         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1929         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1930
1931         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1932                 return -EFAULT;
1933
1934         return 0;
1935 }
1936
1937
1938 static int
1939 et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1940 {
1941         struct v4l2_format format;
1942         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1943
1944         if (copy_from_user(&format, arg, sizeof(format)))
1945                 return -EFAULT;
1946
1947         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1948                 return -EINVAL;
1949
1950         pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_ET61X251) ?
1951                            0 : V4L2_COLORSPACE_SRGB;
1952         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1953                              ? 0 : (pfmt->width * pfmt->priv) / 8;
1954         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1955         pfmt->field = V4L2_FIELD_NONE;
1956         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1957
1958         if (copy_to_user(arg, &format, sizeof(format)))
1959                 return -EFAULT;
1960
1961         return 0;
1962 }
1963
1964
1965 static int
1966 et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1967                           void __user * arg)
1968 {
1969         struct et61x251_sensor* s = &cam->sensor;
1970         struct v4l2_format format;
1971         struct v4l2_pix_format* pix;
1972         struct v4l2_pix_format* pfmt = &(s->pix_format);
1973         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1974         struct v4l2_rect rect;
1975         u8 scale;
1976         const enum et61x251_stream_state stream = cam->stream;
1977         const u32 nbuffers = cam->nbuffers;
1978         u32 i;
1979         int err = 0;
1980
1981         if (copy_from_user(&format, arg, sizeof(format)))
1982                 return -EFAULT;
1983
1984         pix = &(format.fmt.pix);
1985
1986         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1987                 return -EINVAL;
1988
1989         memcpy(&rect, &(s->_rect), sizeof(rect));
1990
1991         { /* calculate the actual scaling factor */
1992                 u32 a, b;
1993                 a = rect.width * rect.height;
1994                 b = pix->width * pix->height;
1995                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1996         }
1997
1998         rect.width = scale * pix->width;
1999         rect.height = scale * pix->height;
2000
2001         if (rect.width < 16)
2002                 rect.width = 16;
2003         if (rect.height < 16)
2004                 rect.height = 16;
2005         if (rect.width > bounds->left + bounds->width - rect.left)
2006                 rect.width = bounds->left + bounds->width - rect.left;
2007         if (rect.height > bounds->top + bounds->height - rect.top)
2008                 rect.height = bounds->top + bounds->height - rect.top;
2009
2010         rect.width &= ~15L;
2011         rect.height &= ~15L;
2012
2013         { /* adjust the scaling factor */
2014                 u32 a, b;
2015                 a = rect.width * rect.height;
2016                 b = pix->width * pix->height;
2017                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
2018         }
2019
2020         pix->width = rect.width / scale;
2021         pix->height = rect.height / scale;
2022
2023         if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
2024             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2025                 pix->pixelformat = pfmt->pixelformat;
2026         pix->priv = pfmt->priv; /* bpp */
2027         pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_ET61X251) ?
2028                           0 : V4L2_COLORSPACE_SRGB;
2029         pix->colorspace = pfmt->colorspace;
2030         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
2031                             ? 0 : (pix->width * pix->priv) / 8;
2032         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2033         pix->field = V4L2_FIELD_NONE;
2034
2035         if (cmd == VIDIOC_TRY_FMT) {
2036                 if (copy_to_user(arg, &format, sizeof(format)))
2037                         return -EFAULT;
2038                 return 0;
2039         }
2040
2041         if (cam->module_param.force_munmap)
2042                 for (i = 0; i < cam->nbuffers; i++)
2043                         if (cam->frame[i].vma_use_count) {
2044                                 DBG(3, "VIDIOC_S_FMT failed. "
2045                                        "Unmap the buffers first.");
2046                                 return -EBUSY;
2047                         }
2048
2049         if (cam->stream == STREAM_ON)
2050                 if ((err = et61x251_stream_interrupt(cam)))
2051                         return err;
2052
2053         if (copy_to_user(arg, &format, sizeof(format))) {
2054                 cam->stream = stream;
2055                 return -EFAULT;
2056         }
2057
2058         if (cam->module_param.force_munmap || cam->io == IO_READ)
2059                 et61x251_release_buffers(cam);
2060
2061         err += et61x251_set_pix_format(cam, pix);
2062         err += et61x251_set_crop(cam, &rect);
2063         if (s->set_pix_format)
2064                 err += s->set_pix_format(cam, pix);
2065         if (s->set_crop)
2066                 err += s->set_crop(cam, &rect);
2067         err += et61x251_set_scale(cam, scale);
2068
2069         if (err) { /* atomic, no rollback in ioctl() */
2070                 cam->state |= DEV_MISCONFIGURED;
2071                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2072                        "use the camera, close and open /dev/video%d again.",
2073                     cam->v4ldev->num);
2074                 return -EIO;
2075         }
2076
2077         memcpy(pfmt, pix, sizeof(*pix));
2078         memcpy(&(s->_rect), &rect, sizeof(rect));
2079
2080         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2081             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2082                 cam->state |= DEV_MISCONFIGURED;
2083                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2084                        "use the camera, close and open /dev/video%d again.",
2085                     cam->v4ldev->num);
2086                 return -ENOMEM;
2087         }
2088
2089         if (cam->io == IO_READ)
2090                 et61x251_empty_framequeues(cam);
2091         else if (cam->module_param.force_munmap)
2092                 et61x251_requeue_outqueue(cam);
2093
2094         cam->stream = stream;
2095
2096         return 0;
2097 }
2098
2099
2100 static int
2101 et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2102 {
2103         if (copy_to_user(arg, &cam->compression,
2104                          sizeof(cam->compression)))
2105                 return -EFAULT;
2106
2107         return 0;
2108 }
2109
2110
2111 static int
2112 et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2113 {
2114         struct v4l2_jpegcompression jc;
2115         const enum et61x251_stream_state stream = cam->stream;
2116         int err = 0;
2117
2118         if (copy_from_user(&jc, arg, sizeof(jc)))
2119                 return -EFAULT;
2120
2121         if (jc.quality != 0 && jc.quality != 1)
2122                 return -EINVAL;
2123
2124         if (cam->stream == STREAM_ON)
2125                 if ((err = et61x251_stream_interrupt(cam)))
2126                         return err;
2127
2128         err += et61x251_set_compression(cam, &jc);
2129         if (err) { /* atomic, no rollback in ioctl() */
2130                 cam->state |= DEV_MISCONFIGURED;
2131                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2132                        "problems. To use the camera, close and open "
2133                        "/dev/video%d again.", cam->v4ldev->num);
2134                 return -EIO;
2135         }
2136
2137         cam->compression.quality = jc.quality;
2138
2139         cam->stream = stream;
2140
2141         return 0;
2142 }
2143
2144
2145 static int
2146 et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2147 {
2148         struct v4l2_requestbuffers rb;
2149         u32 i;
2150         int err;
2151
2152         if (copy_from_user(&rb, arg, sizeof(rb)))
2153                 return -EFAULT;
2154
2155         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2156             rb.memory != V4L2_MEMORY_MMAP)
2157                 return -EINVAL;
2158
2159         if (cam->io == IO_READ) {
2160                 DBG(3, "Close and open the device again to choose the mmap "
2161                        "I/O method");
2162                 return -EBUSY;
2163         }
2164
2165         for (i = 0; i < cam->nbuffers; i++)
2166                 if (cam->frame[i].vma_use_count) {
2167                         DBG(3, "VIDIOC_REQBUFS failed. "
2168                                "Previous buffers are still mapped.");
2169                         return -EBUSY;
2170                 }
2171
2172         if (cam->stream == STREAM_ON)
2173                 if ((err = et61x251_stream_interrupt(cam)))
2174                         return err;
2175
2176         et61x251_empty_framequeues(cam);
2177
2178         et61x251_release_buffers(cam);
2179         if (rb.count)
2180                 rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2181
2182         if (copy_to_user(arg, &rb, sizeof(rb))) {
2183                 et61x251_release_buffers(cam);
2184                 cam->io = IO_NONE;
2185                 return -EFAULT;
2186         }
2187
2188         cam->io = rb.count ? IO_MMAP : IO_NONE;
2189
2190         return 0;
2191 }
2192
2193
2194 static int
2195 et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2196 {
2197         struct v4l2_buffer b;
2198
2199         if (copy_from_user(&b, arg, sizeof(b)))
2200                 return -EFAULT;
2201
2202         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2203             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2204                 return -EINVAL;
2205
2206         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2207
2208         if (cam->frame[b.index].vma_use_count)
2209                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2210
2211         if (cam->frame[b.index].state == F_DONE)
2212                 b.flags |= V4L2_BUF_FLAG_DONE;
2213         else if (cam->frame[b.index].state != F_UNUSED)
2214                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2215
2216         if (copy_to_user(arg, &b, sizeof(b)))
2217                 return -EFAULT;
2218
2219         return 0;
2220 }
2221
2222
2223 static int
2224 et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2225 {
2226         struct v4l2_buffer b;
2227         unsigned long lock_flags;
2228
2229         if (copy_from_user(&b, arg, sizeof(b)))
2230                 return -EFAULT;
2231
2232         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2233             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2234                 return -EINVAL;
2235
2236         if (cam->frame[b.index].state != F_UNUSED)
2237                 return -EINVAL;
2238
2239         cam->frame[b.index].state = F_QUEUED;
2240
2241         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2242         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2243         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2244
2245         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2246
2247         return 0;
2248 }
2249
2250
2251 static int
2252 et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2253                       void __user * arg)
2254 {
2255         struct v4l2_buffer b;
2256         struct et61x251_frame_t *f;
2257         unsigned long lock_flags;
2258         long timeout;
2259
2260         if (copy_from_user(&b, arg, sizeof(b)))
2261                 return -EFAULT;
2262
2263         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2264                 return -EINVAL;
2265
2266         if (list_empty(&cam->outqueue)) {
2267                 if (cam->stream == STREAM_OFF)
2268                         return -EINVAL;
2269                 if (filp->f_flags & O_NONBLOCK)
2270                         return -EAGAIN;
2271                 timeout = wait_event_interruptible_timeout
2272                           ( cam->wait_frame,
2273                             (!list_empty(&cam->outqueue)) ||
2274                             (cam->state & DEV_DISCONNECTED) ||
2275                             (cam->state & DEV_MISCONFIGURED),
2276                             cam->module_param.frame_timeout *
2277                             1000 * msecs_to_jiffies(1) );
2278                 if (timeout < 0)
2279                         return timeout;
2280                 if (cam->state & DEV_DISCONNECTED)
2281                         return -ENODEV;
2282                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2283                         return -EIO;
2284         }
2285
2286         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2287         f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2288         list_del(cam->outqueue.next);
2289         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2290
2291         f->state = F_UNUSED;
2292
2293         memcpy(&b, &f->buf, sizeof(b));
2294         if (f->vma_use_count)
2295                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2296
2297         if (copy_to_user(arg, &b, sizeof(b)))
2298                 return -EFAULT;
2299
2300         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2301
2302         return 0;
2303 }
2304
2305
2306 static int
2307 et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2308 {
2309         int type;
2310
2311         if (copy_from_user(&type, arg, sizeof(type)))
2312                 return -EFAULT;
2313
2314         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2315                 return -EINVAL;
2316
2317         cam->stream = STREAM_ON;
2318
2319         DBG(3, "Stream on");
2320
2321         return 0;
2322 }
2323
2324
2325 static int
2326 et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2327 {
2328         int type, err;
2329
2330         if (copy_from_user(&type, arg, sizeof(type)))
2331                 return -EFAULT;
2332
2333         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2334                 return -EINVAL;
2335
2336         if (cam->stream == STREAM_ON)
2337                 if ((err = et61x251_stream_interrupt(cam)))
2338                         return err;
2339
2340         et61x251_empty_framequeues(cam);
2341
2342         DBG(3, "Stream off");
2343
2344         return 0;
2345 }
2346
2347
2348 static int
2349 et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2350 {
2351         struct v4l2_streamparm sp;
2352
2353         if (copy_from_user(&sp, arg, sizeof(sp)))
2354                 return -EFAULT;
2355
2356         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2357                 return -EINVAL;
2358
2359         sp.parm.capture.extendedmode = 0;
2360         sp.parm.capture.readbuffers = cam->nreadbuffers;
2361
2362         if (copy_to_user(arg, &sp, sizeof(sp)))
2363                 return -EFAULT;
2364
2365         return 0;
2366 }
2367
2368
2369 static int
2370 et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2371 {
2372         struct v4l2_streamparm sp;
2373
2374         if (copy_from_user(&sp, arg, sizeof(sp)))
2375                 return -EFAULT;
2376
2377         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2378                 return -EINVAL;
2379
2380         sp.parm.capture.extendedmode = 0;
2381
2382         if (sp.parm.capture.readbuffers == 0)
2383                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2384
2385         if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2386                 sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2387
2388         if (copy_to_user(arg, &sp, sizeof(sp)))
2389                 return -EFAULT;
2390
2391         cam->nreadbuffers = sp.parm.capture.readbuffers;
2392
2393         return 0;
2394 }
2395
2396
2397 static long et61x251_ioctl_v4l2(struct file *filp,
2398                                unsigned int cmd, void __user *arg)
2399 {
2400         struct et61x251_device *cam = video_drvdata(filp);
2401
2402         switch (cmd) {
2403
2404         case VIDIOC_QUERYCAP:
2405                 return et61x251_vidioc_querycap(cam, arg);
2406
2407         case VIDIOC_ENUMINPUT:
2408                 return et61x251_vidioc_enuminput(cam, arg);
2409
2410         case VIDIOC_G_INPUT:
2411                 return et61x251_vidioc_g_input(cam, arg);
2412
2413         case VIDIOC_S_INPUT:
2414                 return et61x251_vidioc_s_input(cam, arg);
2415
2416         case VIDIOC_QUERYCTRL:
2417                 return et61x251_vidioc_query_ctrl(cam, arg);
2418
2419         case VIDIOC_G_CTRL:
2420                 return et61x251_vidioc_g_ctrl(cam, arg);
2421
2422         case VIDIOC_S_CTRL:
2423                 return et61x251_vidioc_s_ctrl(cam, arg);
2424
2425         case VIDIOC_CROPCAP:
2426                 return et61x251_vidioc_cropcap(cam, arg);
2427
2428         case VIDIOC_G_CROP:
2429                 return et61x251_vidioc_g_crop(cam, arg);
2430
2431         case VIDIOC_S_CROP:
2432                 return et61x251_vidioc_s_crop(cam, arg);
2433
2434         case VIDIOC_ENUM_FMT:
2435                 return et61x251_vidioc_enum_fmt(cam, arg);
2436
2437         case VIDIOC_G_FMT:
2438                 return et61x251_vidioc_g_fmt(cam, arg);
2439
2440         case VIDIOC_TRY_FMT:
2441         case VIDIOC_S_FMT:
2442                 return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2443
2444         case VIDIOC_ENUM_FRAMESIZES:
2445                 return et61x251_vidioc_enum_framesizes(cam, arg);
2446
2447         case VIDIOC_G_JPEGCOMP:
2448                 return et61x251_vidioc_g_jpegcomp(cam, arg);
2449
2450         case VIDIOC_S_JPEGCOMP:
2451                 return et61x251_vidioc_s_jpegcomp(cam, arg);
2452
2453         case VIDIOC_REQBUFS:
2454                 return et61x251_vidioc_reqbufs(cam, arg);
2455
2456         case VIDIOC_QUERYBUF:
2457                 return et61x251_vidioc_querybuf(cam, arg);
2458
2459         case VIDIOC_QBUF:
2460                 return et61x251_vidioc_qbuf(cam, arg);
2461
2462         case VIDIOC_DQBUF:
2463                 return et61x251_vidioc_dqbuf(cam, filp, arg);
2464
2465         case VIDIOC_STREAMON:
2466                 return et61x251_vidioc_streamon(cam, arg);
2467
2468         case VIDIOC_STREAMOFF:
2469                 return et61x251_vidioc_streamoff(cam, arg);
2470
2471         case VIDIOC_G_PARM:
2472                 return et61x251_vidioc_g_parm(cam, arg);
2473
2474         case VIDIOC_S_PARM:
2475                 return et61x251_vidioc_s_parm(cam, arg);
2476
2477         case VIDIOC_G_STD:
2478         case VIDIOC_S_STD:
2479         case VIDIOC_QUERYSTD:
2480         case VIDIOC_ENUMSTD:
2481         case VIDIOC_QUERYMENU:
2482         case VIDIOC_ENUM_FRAMEINTERVALS:
2483                 return -EINVAL;
2484
2485         default:
2486                 return -EINVAL;
2487
2488         }
2489 }
2490
2491
2492 static long et61x251_ioctl(struct file *filp,
2493                          unsigned int cmd, unsigned long arg)
2494 {
2495         struct et61x251_device *cam = video_drvdata(filp);
2496         long err = 0;
2497
2498         if (mutex_lock_interruptible(&cam->fileop_mutex))
2499                 return -ERESTARTSYS;
2500
2501         if (cam->state & DEV_DISCONNECTED) {
2502                 DBG(1, "Device not present");
2503                 mutex_unlock(&cam->fileop_mutex);
2504                 return -ENODEV;
2505         }
2506
2507         if (cam->state & DEV_MISCONFIGURED) {
2508                 DBG(1, "The camera is misconfigured. Close and open it "
2509                        "again.");
2510                 mutex_unlock(&cam->fileop_mutex);
2511                 return -EIO;
2512         }
2513
2514         V4LDBG(3, "et61x251", cmd);
2515
2516         err = et61x251_ioctl_v4l2(filp, cmd, (void __user *)arg);
2517
2518         mutex_unlock(&cam->fileop_mutex);
2519
2520         return err;
2521 }
2522
2523
2524 static const struct v4l2_file_operations et61x251_fops = {
2525         .owner = THIS_MODULE,
2526         .open =    et61x251_open,
2527         .release = et61x251_release,
2528         .ioctl =   et61x251_ioctl,
2529         .read =    et61x251_read,
2530         .poll =    et61x251_poll,
2531         .mmap =    et61x251_mmap,
2532 };
2533
2534 /*****************************************************************************/
2535
2536 /* It exists a single interface only. We do not need to validate anything. */
2537 static int
2538 et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2539 {
2540         struct usb_device *udev = interface_to_usbdev(intf);
2541         struct et61x251_device* cam;
2542         static unsigned int dev_nr;
2543         unsigned int i;
2544         int err = 0;
2545
2546         if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2547                 return -ENOMEM;
2548
2549         cam->usbdev = udev;
2550
2551         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2552                 DBG(1, "kmalloc() failed");
2553                 err = -ENOMEM;
2554                 goto fail;
2555         }
2556
2557         if (!(cam->v4ldev = video_device_alloc())) {
2558                 DBG(1, "video_device_alloc() failed");
2559                 err = -ENOMEM;
2560                 goto fail;
2561         }
2562
2563         DBG(2, "ET61X[12]51 PC Camera Controller detected "
2564                "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
2565
2566         for  (i = 0; et61x251_sensor_table[i]; i++) {
2567                 err = et61x251_sensor_table[i](cam);
2568                 if (!err)
2569                         break;
2570         }
2571
2572         if (!err)
2573                 DBG(2, "%s image sensor detected", cam->sensor.name);
2574         else {
2575                 DBG(1, "No supported image sensor detected");
2576                 err = -ENODEV;
2577                 goto fail;
2578         }
2579
2580         if (et61x251_init(cam)) {
2581                 DBG(1, "Initialization failed. I will retry on open().");
2582                 cam->state |= DEV_MISCONFIGURED;
2583         }
2584
2585         strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2586         cam->v4ldev->fops = &et61x251_fops;
2587         cam->v4ldev->minor = video_nr[dev_nr];
2588         cam->v4ldev->release = video_device_release;
2589         cam->v4ldev->parent = &udev->dev;
2590         video_set_drvdata(cam->v4ldev, cam);
2591
2592         init_completion(&cam->probe);
2593
2594         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2595                                     video_nr[dev_nr]);
2596         if (err) {
2597                 DBG(1, "V4L2 device registration failed");
2598                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2599                         DBG(1, "Free /dev/videoX node not found");
2600                 video_nr[dev_nr] = -1;
2601                 dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2602                 complete_all(&cam->probe);
2603                 goto fail;
2604         }
2605
2606         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->num);
2607
2608         cam->module_param.force_munmap = force_munmap[dev_nr];
2609         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2610
2611         dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2612
2613 #ifdef CONFIG_VIDEO_ADV_DEBUG
2614         err = et61x251_create_sysfs(cam);
2615         if (!err)
2616                 DBG(2, "Optional device control through 'sysfs' "
2617                        "interface ready");
2618         else
2619                 DBG(2, "Failed to create 'sysfs' interface for optional "
2620                        "device controlling. Error #%d", err);
2621 #else
2622         DBG(2, "Optional device control through 'sysfs' interface disabled");
2623         DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
2624                "configuration option to enable it.");
2625 #endif
2626
2627         usb_set_intfdata(intf, cam);
2628         kref_init(&cam->kref);
2629         usb_get_dev(cam->usbdev);
2630
2631         complete_all(&cam->probe);
2632
2633         return 0;
2634
2635 fail:
2636         if (cam) {
2637                 kfree(cam->control_buffer);
2638                 if (cam->v4ldev)
2639                         video_device_release(cam->v4ldev);
2640                 kfree(cam);
2641         }
2642         return err;
2643 }
2644
2645
2646 static void et61x251_usb_disconnect(struct usb_interface* intf)
2647 {
2648         struct et61x251_device* cam;
2649
2650         down_write(&et61x251_dev_lock);
2651
2652         cam = usb_get_intfdata(intf);
2653
2654         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2655
2656         if (cam->users) {
2657                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2658                        "memory deallocation are deferred.",
2659                     cam->v4ldev->num);
2660                 cam->state |= DEV_MISCONFIGURED;
2661                 et61x251_stop_transfer(cam);
2662                 cam->state |= DEV_DISCONNECTED;
2663                 wake_up_interruptible(&cam->wait_frame);
2664                 wake_up(&cam->wait_stream);
2665         } else
2666                 cam->state |= DEV_DISCONNECTED;
2667
2668         wake_up_interruptible_all(&cam->wait_open);
2669
2670         kref_put(&cam->kref, et61x251_release_resources);
2671
2672         up_write(&et61x251_dev_lock);
2673 }
2674
2675
2676 static struct usb_driver et61x251_usb_driver = {
2677         .name =       "et61x251",
2678         .id_table =   et61x251_id_table,
2679         .probe =      et61x251_usb_probe,
2680         .disconnect = et61x251_usb_disconnect,
2681 };
2682
2683 /*****************************************************************************/
2684
2685 static int __init et61x251_module_init(void)
2686 {
2687         int err = 0;
2688
2689         KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2690         KDBG(3, ET61X251_MODULE_AUTHOR);
2691
2692         if ((err = usb_register(&et61x251_usb_driver)))
2693                 KDBG(1, "usb_register() failed");
2694
2695         return err;
2696 }
2697
2698
2699 static void __exit et61x251_module_exit(void)
2700 {
2701         usb_deregister(&et61x251_usb_driver);
2702 }
2703
2704
2705 module_init(et61x251_module_init);
2706 module_exit(et61x251_module_exit);