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/moduleparam.h>
  26 #include <linux/errno.h>
  27 #include <linux/slab.h>
  28 #include <linux/device.h>
  29 #include <linux/fs.h>
  30 #include <linux/delay.h>
  31 #include <linux/compiler.h>
  32 #include <linux/ioctl.h>
  33 #include <linux/poll.h>
  34 #include <linux/stat.h>
  35 #include <linux/mm.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/page-flags.h>
  38 #include <linux/byteorder/generic.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 Luca Risolia"
  49 #define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  50 #define ET61X251_MODULE_LICENSE "GPL"
  51 #define ET61X251_MODULE_VERSION "1:1.04"
  52 #define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 4)
  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 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, struct et61x251_sensor* sensor)
 249 {
 250         int i, r;
 251
 252         for (i = 1; i <= 8; i++) {
 253                 if (sensor->interface == ET61X251_I2C_3WIRES) {
 254                         r = et61x251_read_reg(cam, 0x8e);
 255                         if (!(r & 0x02) && (r >= 0))
 256                                 return 0;
 257                 } else {
 258                         r = et61x251_read_reg(cam, 0x8b);
 259                         if (!(r & 0x01) && (r >= 0))
 260                                 return 0;
 261                 }
 262                 if (r < 0)
 263                         return -EIO;
 264                 udelay(8*8); /* minimum for sensors at 400kHz */
 265         }
 266
 267         return -EBUSY;
 268 }
 269
 270
 271 int
 272 et61x251_i2c_try_read(struct et61x251_device* cam,
 273                       struct et61x251_sensor* sensor, u8 address)
 274 {
 275         struct usb_device* udev = cam->usbdev;
 276         u8* data = cam->control_buffer;
 277         int err = 0, res;
 278
 279         data[0] = address;
 280         data[1] = cam->sensor.i2c_slave_id;
 281         data[2] = cam->sensor.rsta | 0x10;
 282         data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
 283         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 284                               0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
 285         if (res < 0)
 286                 err += res;
 287
 288         err += et61x251_i2c_wait(cam, sensor);
 289
 290         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 291                               0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
 292         if (res < 0)
 293                 err += res;
 294
 295         if (err)
 296                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 297
 298         PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
 299
 300         return err ? -1 : (int)data[0];
 301 }
 302
 303
 304 int
 305 et61x251_i2c_try_write(struct et61x251_device* cam,
 306                        struct et61x251_sensor* sensor, u8 address, u8 value)
 307 {
 308         struct usb_device* udev = cam->usbdev;
 309         u8* data = cam->control_buffer;
 310         int err = 0, res;
 311
 312         data[0] = address;
 313         data[1] = cam->sensor.i2c_slave_id;
 314         data[2] = cam->sensor.rsta | 0x12;
 315         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 316                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 317         if (res < 0)
 318                 err += res;
 319
 320         data[0] = value;
 321         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 322                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 323         if (res < 0)
 324                 err += res;
 325
 326         err += et61x251_i2c_wait(cam, sensor);
 327
 328         if (err)
 329                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 330
 331         PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
 332
 333         return err ? -1 : 0;
 334 }
 335
 336
 337 int
 338 et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
 339                        u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
 340                        u8 data8, u8 address)
 341 {
 342         struct usb_device* udev = cam->usbdev;
 343         u8* data = cam->control_buffer;
 344         int err = 0, res;
 345
 346         data[0] = data2;
 347         data[1] = data3;
 348         data[2] = data4;
 349         data[3] = data5;
 350         data[4] = data6;
 351         data[5] = data7;
 352         data[6] = data8;
 353         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 354                               0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
 355         if (res < 0)
 356                 err += res;
 357
 358         data[0] = address;
 359         data[1] = cam->sensor.i2c_slave_id;
 360         data[2] = cam->sensor.rsta | 0x02 | (n << 4);
 361         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 362                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 363         if (res < 0)
 364                 err += res;
 365
 366         /* Start writing through the serial interface */
 367         data[0] = data1;
 368         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 369                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 370         if (res < 0)
 371                 err += res;
 372
 373         err += et61x251_i2c_wait(cam, &cam->sensor);
 374
 375         if (err)
 376                 DBG(3, "I2C raw write failed for %s image sensor",
 377                     cam->sensor.name);
 378
 379         PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
 380               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
 381               " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
 382               data1, data2, data3, data4, data5, data6, data7, data8);
 383
 384         return err ? -1 : 0;
 385
 386 }
 387
 388
 389 int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
 390 {
 391         return et61x251_i2c_try_read(cam, &cam->sensor, address);
 392 }
 393
 394
 395 int et61x251_i2c_write(struct et61x251_device* cam, u8 address, u8 value)
 396 {
 397         return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
 398 }
 399
 400 /*****************************************************************************/
 401
 402 static void et61x251_urb_complete(struct urb *urb)
 403 {
 404         struct et61x251_device* cam = urb->context;
 405         struct et61x251_frame_t** f;
 406         size_t imagesize;
 407         u8 i;
 408         int err = 0;
 409
 410         if (urb->status == -ENOENT)
 411                 return;
 412
 413         f = &cam->frame_current;
 414
 415         if (cam->stream == STREAM_INTERRUPT) {
 416                 cam->stream = STREAM_OFF;
 417                 if ((*f))
 418                         (*f)->state = F_QUEUED;
 419                 DBG(3, "Stream interrupted");
 420                 wake_up(&cam->wait_stream);
 421         }
 422
 423         if (cam->state & DEV_DISCONNECTED)
 424                 return;
 425
 426         if (cam->state & DEV_MISCONFIGURED) {
 427                 wake_up_interruptible(&cam->wait_frame);
 428                 return;
 429         }
 430
 431         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 432                 goto resubmit_urb;
 433
 434         if (!(*f))
 435                 (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
 436                                   frame);
 437
 438         imagesize = (cam->sensor.pix_format.width *
 439                      cam->sensor.pix_format.height *
 440                      cam->sensor.pix_format.priv) / 8;
 441
 442         for (i = 0; i < urb->number_of_packets; i++) {
 443                 unsigned int len, status;
 444                 void *pos;
 445                 u8* b1, * b2, sof;
 446                 const u8 VOID_BYTES = 6;
 447                 size_t imglen;
 448
 449                 len = urb->iso_frame_desc[i].actual_length;
 450                 status = urb->iso_frame_desc[i].status;
 451                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 452
 453                 if (status) {
 454                         DBG(3, "Error in isochronous frame");
 455                         (*f)->state = F_ERROR;
 456                         continue;
 457                 }
 458
 459                 b1 = pos++;
 460                 b2 = pos++;
 461                 sof = ((*b1 & 0x3f) == 63);
 462                 imglen = ((*b1 & 0xc0) << 2) | *b2;
 463
 464                 PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
 465                       len, i, imglen);
 466
 467                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 468 start_of_frame:
 469                         if (sof) {
 470                                 (*f)->state = F_GRABBING;
 471                                 (*f)->buf.bytesused = 0;
 472                                 do_gettimeofday(&(*f)->buf.timestamp);
 473                                 pos += 22;
 474                                 DBG(3, "SOF detected: new video frame");
 475                         }
 476
 477                 if ((*f)->state == F_GRABBING) {
 478                         if (sof && (*f)->buf.bytesused) {
 479                                 if (cam->sensor.pix_format.pixelformat ==
 480                                                          V4L2_PIX_FMT_ET61X251)
 481                                         goto end_of_frame;
 482                                 else {
 483                                         DBG(3, "Not expected SOF detected "
 484                                                "after %lu bytes",
 485                                            (unsigned long)(*f)->buf.bytesused);
 486                                         (*f)->state = F_ERROR;
 487                                         continue;
 488                                 }
 489                         }
 490
 491                         if ((*f)->buf.bytesused + imglen > imagesize) {
 492                                 DBG(3, "Video frame size exceeded");
 493                                 (*f)->state = F_ERROR;
 494                                 continue;
 495                         }
 496
 497                         pos += VOID_BYTES;
 498
 499                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
 500                         (*f)->buf.bytesused += imglen;
 501
 502                         if ((*f)->buf.bytesused == imagesize) {
 503                                 u32 b;
 504 end_of_frame:
 505                                 b = (*f)->buf.bytesused;
 506                                 (*f)->state = F_DONE;
 507                                 (*f)->buf.sequence= ++cam->frame_count;
 508                                 spin_lock(&cam->queue_lock);
 509                                 list_move_tail(&(*f)->frame, &cam->outqueue);
 510                                 if (!list_empty(&cam->inqueue))
 511                                         (*f) = list_entry(cam->inqueue.next,
 512                                                        struct et61x251_frame_t,
 513                                                           frame);
 514                                 else
 515                                         (*f) = NULL;
 516                                 spin_unlock(&cam->queue_lock);
 517                                 DBG(3, "Video frame captured: : %lu bytes",
 518                                        (unsigned long)(b));
 519
 520                                 if (!(*f))
 521                                         goto resubmit_urb;
 522
 523                                 if (sof &&
 524                                     cam->sensor.pix_format.pixelformat ==
 525                                                          V4L2_PIX_FMT_ET61X251)
 526                                         goto start_of_frame;
 527                         }
 528                 }
 529         }
 530
 531 resubmit_urb:
 532         urb->dev = cam->usbdev;
 533         err = usb_submit_urb(urb, GFP_ATOMIC);
 534         if (err < 0 && err != -EPERM) {
 535                 cam->state |= DEV_MISCONFIGURED;
 536                 DBG(1, "usb_submit_urb() failed");
 537         }
 538
 539         wake_up_interruptible(&cam->wait_frame);
 540 }
 541
 542
 543 static int et61x251_start_transfer(struct et61x251_device* cam)
 544 {
 545         struct usb_device *udev = cam->usbdev;
 546         struct urb* urb;
 547         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 548                                                    usb_ifnum_to_if(udev, 0),
 549                                                    ET61X251_ALTERNATE_SETTING);
 550         const unsigned int psz = le16_to_cpu(altsetting->
 551                                              endpoint[0].desc.wMaxPacketSize);
 552         s8 i, j;
 553         int err = 0;
 554
 555         for (i = 0; i < ET61X251_URBS; i++) {
 556                 cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
 557                                                   GFP_KERNEL);
 558                 if (!cam->transfer_buffer[i]) {
 559                         err = -ENOMEM;
 560                         DBG(1, "Not enough memory");
 561                         goto free_buffers;
 562                 }
 563         }
 564
 565         for (i = 0; i < ET61X251_URBS; i++) {
 566                 urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
 567                 cam->urb[i] = urb;
 568                 if (!urb) {
 569                         err = -ENOMEM;
 570                         DBG(1, "usb_alloc_urb() failed");
 571                         goto free_urbs;
 572                 }
 573                 urb->dev = udev;
 574                 urb->context = cam;
 575                 urb->pipe = usb_rcvisocpipe(udev, 1);
 576                 urb->transfer_flags = URB_ISO_ASAP;
 577                 urb->number_of_packets = ET61X251_ISO_PACKETS;
 578                 urb->complete = et61x251_urb_complete;
 579                 urb->transfer_buffer = cam->transfer_buffer[i];
 580                 urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
 581                 urb->interval = 1;
 582                 for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
 583                         urb->iso_frame_desc[j].offset = psz * j;
 584                         urb->iso_frame_desc[j].length = psz;
 585                 }
 586         }
 587
 588         err = et61x251_write_reg(cam, 0x01, 0x03);
 589         err = et61x251_write_reg(cam, 0x00, 0x03);
 590         err = et61x251_write_reg(cam, 0x08, 0x03);
 591         if (err) {
 592                 err = -EIO;
 593                 DBG(1, "I/O hardware error");
 594                 goto free_urbs;
 595         }
 596
 597         err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
 598         if (err) {
 599                 DBG(1, "usb_set_interface() failed");
 600                 goto free_urbs;
 601         }
 602
 603         cam->frame_current = NULL;
 604
 605         for (i = 0; i < ET61X251_URBS; i++) {
 606                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 607                 if (err) {
 608                         for (j = i-1; j >= 0; j--)
 609                                 usb_kill_urb(cam->urb[j]);
 610                         DBG(1, "usb_submit_urb() failed, error %d", err);
 611                         goto free_urbs;
 612                 }
 613         }
 614
 615         return 0;
 616
 617 free_urbs:
 618         for (i = 0; (i < ET61X251_URBS) &&  cam->urb[i]; i++)
 619                 usb_free_urb(cam->urb[i]);
 620
 621 free_buffers:
 622         for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
 623                 kfree(cam->transfer_buffer[i]);
 624
 625         return err;
 626 }
 627
 628
 629 static int et61x251_stop_transfer(struct et61x251_device* cam)
 630 {
 631         struct usb_device *udev = cam->usbdev;
 632         s8 i;
 633         int err = 0;
 634
 635         if (cam->state & DEV_DISCONNECTED)
 636                 return 0;
 637
 638         for (i = ET61X251_URBS-1; i >= 0; i--) {
 639                 usb_kill_urb(cam->urb[i]);
 640                 usb_free_urb(cam->urb[i]);
 641                 kfree(cam->transfer_buffer[i]);
 642         }
 643
 644         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 645         if (err)
 646                 DBG(3, "usb_set_interface() failed");
 647
 648         return err;
 649 }
 650
 651
 652 static int et61x251_stream_interrupt(struct et61x251_device* cam)
 653 {
 654         long timeout;
 655
 656         cam->stream = STREAM_INTERRUPT;
 657         timeout = wait_event_timeout(cam->wait_stream,
 658                                      (cam->stream == STREAM_OFF) ||
 659                                      (cam->state & DEV_DISCONNECTED),
 660                                      ET61X251_URB_TIMEOUT);
 661         if (cam->state & DEV_DISCONNECTED)
 662                 return -ENODEV;
 663         else if (cam->stream != STREAM_OFF) {
 664                 cam->state |= DEV_MISCONFIGURED;
 665                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
 666                        "use it, close and open /dev/video%d again.",
 667                     cam->v4ldev->minor);
 668                 return -EIO;
 669         }
 670
 671         return 0;
 672 }
 673
 674 /*****************************************************************************/
 675
 676 #ifdef CONFIG_VIDEO_ADV_DEBUG
 677 static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
 678 {
 679         char str[5];
 680         char* endp;
 681         unsigned long val;
 682
 683         if (len < 4) {
 684                 strncpy(str, buff, len);
 685                 str[len+1] = '\0';
 686         } else {
 687                 strncpy(str, buff, 4);
 688                 str[4] = '\0';
 689         }
 690
 691         val = simple_strtoul(str, &endp, 0);
 692
 693         *count = 0;
 694         if (val <= 0xff)
 695                 *count = (ssize_t)(endp - str);
 696         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 697                 *count += 1;
 698
 699         return (u8)val;
 700 }
 701
 702 /*
 703    NOTE 1: being inside one of the following methods implies that the v4l
 704            device exists for sure (see kobjects and reference counters)
 705    NOTE 2: buffers are PAGE_SIZE long
 706 */
 707
 708 static ssize_t et61x251_show_reg(struct class_device* cd, char* buf)
 709 {
 710         struct et61x251_device* cam;
 711         ssize_t count;
 712
 713         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 714                 return -ERESTARTSYS;
 715
 716         cam = video_get_drvdata(to_video_device(cd));
 717         if (!cam) {
 718                 mutex_unlock(&et61x251_sysfs_lock);
 719                 return -ENODEV;
 720         }
 721
 722         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 723
 724         mutex_unlock(&et61x251_sysfs_lock);
 725
 726         return count;
 727 }
 728
 729
 730 static ssize_t
 731 et61x251_store_reg(struct class_device* cd, const char* buf, size_t len)
 732 {
 733         struct et61x251_device* cam;
 734         u8 index;
 735         ssize_t count;
 736
 737         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 738                 return -ERESTARTSYS;
 739
 740         cam = video_get_drvdata(to_video_device(cd));
 741         if (!cam) {
 742                 mutex_unlock(&et61x251_sysfs_lock);
 743                 return -ENODEV;
 744         }
 745
 746         index = et61x251_strtou8(buf, len, &count);
 747         if (index > 0x8e || !count) {
 748                 mutex_unlock(&et61x251_sysfs_lock);
 749                 return -EINVAL;
 750         }
 751
 752         cam->sysfs.reg = index;
 753
 754         DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
 755         DBG(3, "Written bytes: %zd", count);
 756
 757         mutex_unlock(&et61x251_sysfs_lock);
 758
 759         return count;
 760 }
 761
 762
 763 static ssize_t et61x251_show_val(struct class_device* cd, char* buf)
 764 {
 765         struct et61x251_device* cam;
 766         ssize_t count;
 767         int val;
 768
 769         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 770                 return -ERESTARTSYS;
 771
 772         cam = video_get_drvdata(to_video_device(cd));
 773         if (!cam) {
 774                 mutex_unlock(&et61x251_sysfs_lock);
 775                 return -ENODEV;
 776         }
 777
 778         if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
 779                 mutex_unlock(&et61x251_sysfs_lock);
 780                 return -EIO;
 781         }
 782
 783         count = sprintf(buf, "%d\n", val);
 784
 785         DBG(3, "Read bytes: %zd", count);
 786
 787         mutex_unlock(&et61x251_sysfs_lock);
 788
 789         return count;
 790 }
 791
 792
 793 static ssize_t
 794 et61x251_store_val(struct class_device* cd, const char* buf, size_t len)
 795 {
 796         struct et61x251_device* cam;
 797         u8 value;
 798         ssize_t count;
 799         int err;
 800
 801         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 802                 return -ERESTARTSYS;
 803
 804         cam = video_get_drvdata(to_video_device(cd));
 805         if (!cam) {
 806                 mutex_unlock(&et61x251_sysfs_lock);
 807                 return -ENODEV;
 808         }
 809
 810         value = et61x251_strtou8(buf, len, &count);
 811         if (!count) {
 812                 mutex_unlock(&et61x251_sysfs_lock);
 813                 return -EINVAL;
 814         }
 815
 816         err = et61x251_write_reg(cam, value, cam->sysfs.reg);
 817         if (err) {
 818                 mutex_unlock(&et61x251_sysfs_lock);
 819                 return -EIO;
 820         }
 821
 822         DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
 823             cam->sysfs.reg, value);
 824         DBG(3, "Written bytes: %zd", count);
 825
 826         mutex_unlock(&et61x251_sysfs_lock);
 827
 828         return count;
 829 }
 830
 831
 832 static ssize_t et61x251_show_i2c_reg(struct class_device* cd, char* buf)
 833 {
 834         struct et61x251_device* cam;
 835         ssize_t count;
 836
 837         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 838                 return -ERESTARTSYS;
 839
 840         cam = video_get_drvdata(to_video_device(cd));
 841         if (!cam) {
 842                 mutex_unlock(&et61x251_sysfs_lock);
 843                 return -ENODEV;
 844         }
 845
 846         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
 847
 848         DBG(3, "Read bytes: %zd", count);
 849
 850         mutex_unlock(&et61x251_sysfs_lock);
 851
 852         return count;
 853 }
 854
 855
 856 static ssize_t
 857 et61x251_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
 858 {
 859         struct et61x251_device* cam;
 860         u8 index;
 861         ssize_t count;
 862
 863         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 864                 return -ERESTARTSYS;
 865
 866         cam = video_get_drvdata(to_video_device(cd));
 867         if (!cam) {
 868                 mutex_unlock(&et61x251_sysfs_lock);
 869                 return -ENODEV;
 870         }
 871
 872         index = et61x251_strtou8(buf, len, &count);
 873         if (!count) {
 874                 mutex_unlock(&et61x251_sysfs_lock);
 875                 return -EINVAL;
 876         }
 877
 878         cam->sysfs.i2c_reg = index;
 879
 880         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
 881         DBG(3, "Written bytes: %zd", count);
 882
 883         mutex_unlock(&et61x251_sysfs_lock);
 884
 885         return count;
 886 }
 887
 888
 889 static ssize_t et61x251_show_i2c_val(struct class_device* cd, char* buf)
 890 {
 891         struct et61x251_device* cam;
 892         ssize_t count;
 893         int val;
 894
 895         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 896                 return -ERESTARTSYS;
 897
 898         cam = video_get_drvdata(to_video_device(cd));
 899         if (!cam) {
 900                 mutex_unlock(&et61x251_sysfs_lock);
 901                 return -ENODEV;
 902         }
 903
 904         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 905                 mutex_unlock(&et61x251_sysfs_lock);
 906                 return -ENOSYS;
 907         }
 908
 909         if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
 910                 mutex_unlock(&et61x251_sysfs_lock);
 911                 return -EIO;
 912         }
 913
 914         count = sprintf(buf, "%d\n", val);
 915
 916         DBG(3, "Read bytes: %zd", count);
 917
 918         mutex_unlock(&et61x251_sysfs_lock);
 919
 920         return count;
 921 }
 922
 923
 924 static ssize_t
 925 et61x251_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
 926 {
 927         struct et61x251_device* cam;
 928         u8 value;
 929         ssize_t count;
 930         int err;
 931
 932         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 933                 return -ERESTARTSYS;
 934
 935         cam = video_get_drvdata(to_video_device(cd));
 936         if (!cam) {
 937                 mutex_unlock(&et61x251_sysfs_lock);
 938                 return -ENODEV;
 939         }
 940
 941         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 942                 mutex_unlock(&et61x251_sysfs_lock);
 943                 return -ENOSYS;
 944         }
 945
 946         value = et61x251_strtou8(buf, len, &count);
 947         if (!count) {
 948                 mutex_unlock(&et61x251_sysfs_lock);
 949                 return -EINVAL;
 950         }
 951
 952         err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
 953         if (err) {
 954                 mutex_unlock(&et61x251_sysfs_lock);
 955                 return -EIO;
 956         }
 957
 958         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
 959             cam->sysfs.i2c_reg, value);
 960         DBG(3, "Written bytes: %zd", count);
 961
 962         mutex_unlock(&et61x251_sysfs_lock);
 963
 964         return count;
 965 }
 966
 967
 968 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
 969                          et61x251_show_reg, et61x251_store_reg);
 970 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
 971                          et61x251_show_val, et61x251_store_val);
 972 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
 973                          et61x251_show_i2c_reg, et61x251_store_i2c_reg);
 974 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
 975                          et61x251_show_i2c_val, et61x251_store_i2c_val);
 976
 977
 978 static int et61x251_create_sysfs(struct et61x251_device* cam)
 979 {
 980         struct video_device *v4ldev = cam->v4ldev;
 981         int err = 0;
 982
 983         if ((err = video_device_create_file(v4ldev, &class_device_attr_reg)))
 984                 goto err_out;
 985         if ((err = video_device_create_file(v4ldev, &class_device_attr_val)))
 986                 goto err_reg;
 987
 988         if (cam->sensor.sysfs_ops) {
 989                 if ((err = video_device_create_file(v4ldev,
 990                                                   &class_device_attr_i2c_reg)))
 991                         goto err_val;
 992                 if ((err = video_device_create_file(v4ldev,
 993                                                   &class_device_attr_i2c_val)))
 994                         goto err_i2c_reg;
 995         }
 996
 997 err_i2c_reg:
 998         if (cam->sensor.sysfs_ops)
 999         video_device_remove_file(v4ldev, &class_device_attr_i2c_reg);
1000 err_val:
1001         video_device_remove_file(v4ldev, &class_device_attr_val);
1002 err_reg:
1003         video_device_remove_file(v4ldev, &class_device_attr_reg);
1004 err_out:
1005         return err;
1006 }
1007 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1008
1009 /*****************************************************************************/
1010
1011 static int
1012 et61x251_set_pix_format(struct et61x251_device* cam,
1013                         struct v4l2_pix_format* pix)
1014 {
1015         int r, err = 0;
1016
1017         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1018                 err += r;
1019         if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1020                 err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1021         else
1022                 err += et61x251_write_reg(cam, r | 0x02, 0x12);
1023
1024         return err ? -EIO : 0;
1025 }
1026
1027
1028 static int
1029 et61x251_set_compression(struct et61x251_device* cam,
1030                          struct v4l2_jpegcompression* compression)
1031 {
1032         int r, err = 0;
1033
1034         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1035                 err += r;
1036         if (compression->quality == 0)
1037                 err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1038         else
1039                 err += et61x251_write_reg(cam, r | 0x04, 0x12);
1040
1041         return err ? -EIO : 0;
1042 }
1043
1044
1045 static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1046 {
1047         int r = 0, err = 0;
1048
1049         r = et61x251_read_reg(cam, 0x12);
1050         if (r < 0)
1051                 err += r;
1052
1053         if (scale == 1)
1054                 err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1055         else if (scale == 2)
1056                 err += et61x251_write_reg(cam, r | 0x01, 0x12);
1057
1058         if (err)
1059                 return -EIO;
1060
1061         PDBGG("Scaling factor: %u", scale);
1062
1063         return 0;
1064 }
1065
1066
1067 static int
1068 et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1069 {
1070         struct et61x251_sensor* s = &cam->sensor;
1071         u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1072                            s->active_pixel.left),
1073             fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1074                            s->active_pixel.top),
1075             fmw_length = (u16)(rect->width),
1076             fmw_height = (u16)(rect->height);
1077         int err = 0;
1078
1079         err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1080         err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1081         err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1082         err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1083         err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1084                                        | ((fmw_length & 0x300) >> 4)
1085                                        | ((fmw_height & 0x300) >> 2), 0x6d);
1086         if (err)
1087                 return -EIO;
1088
1089         PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1090               fmw_sx, fmw_sy, fmw_length, fmw_height);
1091
1092         return 0;
1093 }
1094
1095
1096 static int et61x251_init(struct et61x251_device* cam)
1097 {
1098         struct et61x251_sensor* s = &cam->sensor;
1099         struct v4l2_control ctrl;
1100         struct v4l2_queryctrl *qctrl;
1101         struct v4l2_rect* rect;
1102         u8 i = 0;
1103         int err = 0;
1104
1105         if (!(cam->state & DEV_INITIALIZED)) {
1106                 init_waitqueue_head(&cam->open);
1107                 qctrl = s->qctrl;
1108                 rect = &(s->cropcap.defrect);
1109                 cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1110         } else { /* use current values */
1111                 qctrl = s->_qctrl;
1112                 rect = &(s->_rect);
1113         }
1114
1115         err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1116         err += et61x251_set_crop(cam, rect);
1117         if (err)
1118                 return err;
1119
1120         if (s->init) {
1121                 err = s->init(cam);
1122                 if (err) {
1123                         DBG(3, "Sensor initialization failed");
1124                         return err;
1125                 }
1126         }
1127
1128         err += et61x251_set_compression(cam, &cam->compression);
1129         err += et61x251_set_pix_format(cam, &s->pix_format);
1130         if (s->set_pix_format)
1131                 err += s->set_pix_format(cam, &s->pix_format);
1132         if (err)
1133                 return err;
1134
1135         if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1136                 DBG(3, "Compressed video format is active, quality %d",
1137                     cam->compression.quality);
1138         else
1139                 DBG(3, "Uncompressed video format is active");
1140
1141         if (s->set_crop)
1142                 if ((err = s->set_crop(cam, rect))) {
1143                         DBG(3, "set_crop() failed");
1144                         return err;
1145                 }
1146
1147         if (s->set_ctrl) {
1148                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1149                         if (s->qctrl[i].id != 0 &&
1150                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1151                                 ctrl.id = s->qctrl[i].id;
1152                                 ctrl.value = qctrl[i].default_value;
1153                                 err = s->set_ctrl(cam, &ctrl);
1154                                 if (err) {
1155                                         DBG(3, "Set %s control failed",
1156                                             s->qctrl[i].name);
1157                                         return err;
1158                                 }
1159                                 DBG(3, "Image sensor supports '%s' control",
1160                                     s->qctrl[i].name);
1161                         }
1162         }
1163
1164         if (!(cam->state & DEV_INITIALIZED)) {
1165                 mutex_init(&cam->fileop_mutex);
1166                 spin_lock_init(&cam->queue_lock);
1167                 init_waitqueue_head(&cam->wait_frame);
1168                 init_waitqueue_head(&cam->wait_stream);
1169                 cam->nreadbuffers = 2;
1170                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1171                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1172                        sizeof(struct v4l2_rect));
1173                 cam->state |= DEV_INITIALIZED;
1174         }
1175
1176         DBG(2, "Initialization succeeded");
1177         return 0;
1178 }
1179
1180
1181 static void et61x251_release_resources(struct et61x251_device* cam)
1182 {
1183         mutex_lock(&et61x251_sysfs_lock);
1184
1185         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1186         video_set_drvdata(cam->v4ldev, NULL);
1187         video_unregister_device(cam->v4ldev);
1188
1189         mutex_unlock(&et61x251_sysfs_lock);
1190
1191         kfree(cam->control_buffer);
1192 }
1193
1194 /*****************************************************************************/
1195
1196 static int et61x251_open(struct inode* inode, struct file* filp)
1197 {
1198         struct et61x251_device* cam;
1199         int err = 0;
1200
1201         /*
1202            This is the only safe way to prevent race conditions with
1203            disconnect
1204         */
1205         if (!down_read_trylock(&et61x251_disconnect))
1206                 return -ERESTARTSYS;
1207
1208         cam = video_get_drvdata(video_devdata(filp));
1209
1210         if (mutex_lock_interruptible(&cam->dev_mutex)) {
1211                 up_read(&et61x251_disconnect);
1212                 return -ERESTARTSYS;
1213         }
1214
1215         if (cam->users) {
1216                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1217                 if ((filp->f_flags & O_NONBLOCK) ||
1218                     (filp->f_flags & O_NDELAY)) {
1219                         err = -EWOULDBLOCK;
1220                         goto out;
1221                 }
1222                 mutex_unlock(&cam->dev_mutex);
1223                 err = wait_event_interruptible_exclusive(cam->open,
1224                                                   cam->state & DEV_DISCONNECTED
1225                                                          || !cam->users);
1226                 if (err) {
1227                         up_read(&et61x251_disconnect);
1228                         return err;
1229                 }
1230                 if (cam->state & DEV_DISCONNECTED) {
1231                         up_read(&et61x251_disconnect);
1232                         return -ENODEV;
1233                 }
1234                 mutex_lock(&cam->dev_mutex);
1235         }
1236
1237
1238         if (cam->state & DEV_MISCONFIGURED) {
1239                 err = et61x251_init(cam);
1240                 if (err) {
1241                         DBG(1, "Initialization failed again. "
1242                                "I will retry on next open().");
1243                         goto out;
1244                 }
1245                 cam->state &= ~DEV_MISCONFIGURED;
1246         }
1247
1248         if ((err = et61x251_start_transfer(cam)))
1249                 goto out;
1250
1251         filp->private_data = cam;
1252         cam->users++;
1253         cam->io = IO_NONE;
1254         cam->stream = STREAM_OFF;
1255         cam->nbuffers = 0;
1256         cam->frame_count = 0;
1257         et61x251_empty_framequeues(cam);
1258
1259         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1260
1261 out:
1262         mutex_unlock(&cam->dev_mutex);
1263         up_read(&et61x251_disconnect);
1264         return err;
1265 }
1266
1267
1268 static int et61x251_release(struct inode* inode, struct file* filp)
1269 {
1270         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1271
1272         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
1273
1274         et61x251_stop_transfer(cam);
1275
1276         et61x251_release_buffers(cam);
1277
1278         if (cam->state & DEV_DISCONNECTED) {
1279                 et61x251_release_resources(cam);
1280                 usb_put_dev(cam->usbdev);
1281                 mutex_unlock(&cam->dev_mutex);
1282                 kfree(cam);
1283                 return 0;
1284         }
1285
1286         cam->users--;
1287         wake_up_interruptible_nr(&cam->open, 1);
1288
1289         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1290
1291         mutex_unlock(&cam->dev_mutex);
1292
1293         return 0;
1294 }
1295
1296
1297 static ssize_t
1298 et61x251_read(struct file* filp, char __user * buf,
1299               size_t count, loff_t* f_pos)
1300 {
1301         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1302         struct et61x251_frame_t* f, * i;
1303         unsigned long lock_flags;
1304         long timeout;
1305         int err = 0;
1306
1307         if (mutex_lock_interruptible(&cam->fileop_mutex))
1308                 return -ERESTARTSYS;
1309
1310         if (cam->state & DEV_DISCONNECTED) {
1311                 DBG(1, "Device not present");
1312                 mutex_unlock(&cam->fileop_mutex);
1313                 return -ENODEV;
1314         }
1315
1316         if (cam->state & DEV_MISCONFIGURED) {
1317                 DBG(1, "The camera is misconfigured. Close and open it "
1318                        "again.");
1319                 mutex_unlock(&cam->fileop_mutex);
1320                 return -EIO;
1321         }
1322
1323         if (cam->io == IO_MMAP) {
1324                 DBG(3, "Close and open the device again to choose the read "
1325                        "method");
1326                 mutex_unlock(&cam->fileop_mutex);
1327                 return -EINVAL;
1328         }
1329
1330         if (cam->io == IO_NONE) {
1331                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1332                                               IO_READ)) {
1333                         DBG(1, "read() failed, not enough memory");
1334                         mutex_unlock(&cam->fileop_mutex);
1335                         return -ENOMEM;
1336                 }
1337                 cam->io = IO_READ;
1338                 cam->stream = STREAM_ON;
1339         }
1340
1341         if (list_empty(&cam->inqueue)) {
1342                 if (!list_empty(&cam->outqueue))
1343                         et61x251_empty_framequeues(cam);
1344                 et61x251_queue_unusedframes(cam);
1345         }
1346
1347         if (!count) {
1348                 mutex_unlock(&cam->fileop_mutex);
1349                 return 0;
1350         }
1351
1352         if (list_empty(&cam->outqueue)) {
1353                 if (filp->f_flags & O_NONBLOCK) {
1354                         mutex_unlock(&cam->fileop_mutex);
1355                         return -EAGAIN;
1356                 }
1357                 timeout = wait_event_interruptible_timeout
1358                           ( cam->wait_frame,
1359                             (!list_empty(&cam->outqueue)) ||
1360                             (cam->state & DEV_DISCONNECTED) ||
1361                             (cam->state & DEV_MISCONFIGURED),
1362                             cam->module_param.frame_timeout *
1363                             1000 * msecs_to_jiffies(1) );
1364                 if (timeout < 0) {
1365                         mutex_unlock(&cam->fileop_mutex);
1366                         return timeout;
1367                 }
1368                 if (cam->state & DEV_DISCONNECTED) {
1369                         mutex_unlock(&cam->fileop_mutex);
1370                         return -ENODEV;
1371                 }
1372                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1373                         mutex_unlock(&cam->fileop_mutex);
1374                         return -EIO;
1375                 }
1376         }
1377
1378         f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1379
1380         if (count > f->buf.bytesused)
1381                 count = f->buf.bytesused;
1382
1383         if (copy_to_user(buf, f->bufmem, count)) {
1384                 err = -EFAULT;
1385                 goto exit;
1386         }
1387         *f_pos += count;
1388
1389 exit:
1390         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1391         list_for_each_entry(i, &cam->outqueue, frame)
1392                 i->state = F_UNUSED;
1393         INIT_LIST_HEAD(&cam->outqueue);
1394         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1395
1396         et61x251_queue_unusedframes(cam);
1397
1398         PDBGG("Frame #%lu, bytes read: %zu",
1399               (unsigned long)f->buf.index, count);
1400
1401         mutex_unlock(&cam->fileop_mutex);
1402
1403         return err ? err : count;
1404 }
1405
1406
1407 static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1408 {
1409         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1410         struct et61x251_frame_t* f;
1411         unsigned long lock_flags;
1412         unsigned int mask = 0;
1413
1414         if (mutex_lock_interruptible(&cam->fileop_mutex))
1415                 return POLLERR;
1416
1417         if (cam->state & DEV_DISCONNECTED) {
1418                 DBG(1, "Device not present");
1419                 goto error;
1420         }
1421
1422         if (cam->state & DEV_MISCONFIGURED) {
1423                 DBG(1, "The camera is misconfigured. Close and open it "
1424                        "again.");
1425                 goto error;
1426         }
1427
1428         if (cam->io == IO_NONE) {
1429                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1430                                               IO_READ)) {
1431                         DBG(1, "poll() failed, not enough memory");
1432                         goto error;
1433                 }
1434                 cam->io = IO_READ;
1435                 cam->stream = STREAM_ON;
1436         }
1437
1438         if (cam->io == IO_READ) {
1439                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1440                 list_for_each_entry(f, &cam->outqueue, frame)
1441                         f->state = F_UNUSED;
1442                 INIT_LIST_HEAD(&cam->outqueue);
1443                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1444                 et61x251_queue_unusedframes(cam);
1445         }
1446
1447         poll_wait(filp, &cam->wait_frame, wait);
1448
1449         if (!list_empty(&cam->outqueue))
1450                 mask |= POLLIN | POLLRDNORM;
1451
1452         mutex_unlock(&cam->fileop_mutex);
1453
1454         return mask;
1455
1456 error:
1457         mutex_unlock(&cam->fileop_mutex);
1458         return POLLERR;
1459 }
1460
1461
1462 static void et61x251_vm_open(struct vm_area_struct* vma)
1463 {
1464         struct et61x251_frame_t* f = vma->vm_private_data;
1465         f->vma_use_count++;
1466 }
1467
1468
1469 static void et61x251_vm_close(struct vm_area_struct* vma)
1470 {
1471         /* NOTE: buffers are not freed here */
1472         struct et61x251_frame_t* f = vma->vm_private_data;
1473         f->vma_use_count--;
1474 }
1475
1476
1477 static struct vm_operations_struct et61x251_vm_ops = {
1478         .open = et61x251_vm_open,
1479         .close = et61x251_vm_close,
1480 };
1481
1482
1483 static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1484 {
1485         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1486         unsigned long size = vma->vm_end - vma->vm_start,
1487                       start = vma->vm_start;
1488         void *pos;
1489         u32 i;
1490
1491         if (mutex_lock_interruptible(&cam->fileop_mutex))
1492                 return -ERESTARTSYS;
1493
1494         if (cam->state & DEV_DISCONNECTED) {
1495                 DBG(1, "Device not present");
1496                 mutex_unlock(&cam->fileop_mutex);
1497                 return -ENODEV;
1498         }
1499
1500         if (cam->state & DEV_MISCONFIGURED) {
1501                 DBG(1, "The camera is misconfigured. Close and open it "
1502                        "again.");
1503                 mutex_unlock(&cam->fileop_mutex);
1504                 return -EIO;
1505         }
1506
1507         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1508             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1509                 mutex_unlock(&cam->fileop_mutex);
1510                 return -EINVAL;
1511         }
1512
1513         for (i = 0; i < cam->nbuffers; i++) {
1514                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1515                         break;
1516         }
1517         if (i == cam->nbuffers) {
1518                 mutex_unlock(&cam->fileop_mutex);
1519                 return -EINVAL;
1520         }
1521
1522         vma->vm_flags |= VM_IO;
1523         vma->vm_flags |= VM_RESERVED;
1524
1525         pos = cam->frame[i].bufmem;
1526         while (size > 0) { /* size is page-aligned */
1527                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1528                         mutex_unlock(&cam->fileop_mutex);
1529                         return -EAGAIN;
1530                 }
1531                 start += PAGE_SIZE;
1532                 pos += PAGE_SIZE;
1533                 size -= PAGE_SIZE;
1534         }
1535
1536         vma->vm_ops = &et61x251_vm_ops;
1537         vma->vm_private_data = &cam->frame[i];
1538
1539         et61x251_vm_open(vma);
1540
1541         mutex_unlock(&cam->fileop_mutex);
1542
1543         return 0;
1544 }
1545
1546 /*****************************************************************************/
1547
1548 static int
1549 et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1550 {
1551         struct v4l2_capability cap = {
1552                 .driver = "et61x251",
1553                 .version = ET61X251_MODULE_VERSION_CODE,
1554                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1555                                 V4L2_CAP_STREAMING,
1556         };
1557
1558         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1559         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1560                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1561                         sizeof(cap.bus_info));
1562
1563         if (copy_to_user(arg, &cap, sizeof(cap)))
1564                 return -EFAULT;
1565
1566         return 0;
1567 }
1568
1569
1570 static int
1571 et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1572 {
1573         struct v4l2_input i;
1574
1575         if (copy_from_user(&i, arg, sizeof(i)))
1576                 return -EFAULT;
1577
1578         if (i.index)
1579                 return -EINVAL;
1580
1581         memset(&i, 0, sizeof(i));
1582         strcpy(i.name, "Camera");
1583         i.type = V4L2_INPUT_TYPE_CAMERA;
1584
1585         if (copy_to_user(arg, &i, sizeof(i)))
1586                 return -EFAULT;
1587
1588         return 0;
1589 }
1590
1591
1592 static int
1593 et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1594 {
1595         int index = 0;
1596
1597         if (copy_to_user(arg, &index, sizeof(index)))
1598                 return -EFAULT;
1599
1600         return 0;
1601 }
1602
1603
1604 static int
1605 et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1606 {
1607         int index;
1608
1609         if (copy_from_user(&index, arg, sizeof(index)))
1610                 return -EFAULT;
1611
1612         if (index != 0)
1613                 return -EINVAL;
1614
1615         return 0;
1616 }
1617
1618
1619 static int
1620 et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1621 {
1622         struct et61x251_sensor* s = &cam->sensor;
1623         struct v4l2_queryctrl qc;
1624         u8 i;
1625
1626         if (copy_from_user(&qc, arg, sizeof(qc)))
1627                 return -EFAULT;
1628
1629         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1630                 if (qc.id && qc.id == s->qctrl[i].id) {
1631                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1632                         if (copy_to_user(arg, &qc, sizeof(qc)))
1633                                 return -EFAULT;
1634                         return 0;
1635                 }
1636
1637         return -EINVAL;
1638 }
1639
1640
1641 static int
1642 et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1643 {
1644         struct et61x251_sensor* s = &cam->sensor;
1645         struct v4l2_control ctrl;
1646         int err = 0;
1647         u8 i;
1648
1649         if (!s->get_ctrl && !s->set_ctrl)
1650                 return -EINVAL;
1651
1652         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1653                 return -EFAULT;
1654
1655         if (!s->get_ctrl) {
1656                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1657                         if (ctrl.id == s->qctrl[i].id) {
1658                                 ctrl.value = s->_qctrl[i].default_value;
1659                                 goto exit;
1660                         }
1661                 return -EINVAL;
1662         } else
1663                 err = s->get_ctrl(cam, &ctrl);
1664
1665 exit:
1666         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1667                 return -EFAULT;
1668
1669         return err;
1670 }
1671
1672
1673 static int
1674 et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1675 {
1676         struct et61x251_sensor* s = &cam->sensor;
1677         struct v4l2_control ctrl;
1678         u8 i;
1679         int err = 0;
1680
1681         if (!s->set_ctrl)
1682                 return -EINVAL;
1683
1684         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1685                 return -EFAULT;
1686
1687         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1688                 if (ctrl.id == s->qctrl[i].id) {
1689                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1690                                 return -EINVAL;
1691                         if (ctrl.value < s->qctrl[i].minimum ||
1692                             ctrl.value > s->qctrl[i].maximum)
1693                                 return -ERANGE;
1694                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1695                         break;
1696                 }
1697
1698         if ((err = s->set_ctrl(cam, &ctrl)))
1699                 return err;
1700
1701         s->_qctrl[i].default_value = ctrl.value;
1702
1703         return 0;
1704 }
1705
1706
1707 static int
1708 et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1709 {
1710         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1711
1712         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1713         cc->pixelaspect.numerator = 1;
1714         cc->pixelaspect.denominator = 1;
1715
1716         if (copy_to_user(arg, cc, sizeof(*cc)))
1717                 return -EFAULT;
1718
1719         return 0;
1720 }
1721
1722
1723 static int
1724 et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1725 {
1726         struct et61x251_sensor* s = &cam->sensor;
1727         struct v4l2_crop crop = {
1728                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1729         };
1730
1731         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1732
1733         if (copy_to_user(arg, &crop, sizeof(crop)))
1734                 return -EFAULT;
1735
1736         return 0;
1737 }
1738
1739
1740 static int
1741 et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1742 {
1743         struct et61x251_sensor* s = &cam->sensor;
1744         struct v4l2_crop crop;
1745         struct v4l2_rect* rect;
1746         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1747         struct v4l2_pix_format* pix_format = &(s->pix_format);
1748         u8 scale;
1749         const enum et61x251_stream_state stream = cam->stream;
1750         const u32 nbuffers = cam->nbuffers;
1751         u32 i;
1752         int err = 0;
1753
1754         if (copy_from_user(&crop, arg, sizeof(crop)))
1755                 return -EFAULT;
1756
1757         rect = &(crop.c);
1758
1759         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1760                 return -EINVAL;
1761
1762         if (cam->module_param.force_munmap)
1763                 for (i = 0; i < cam->nbuffers; i++)
1764                         if (cam->frame[i].vma_use_count) {
1765                                 DBG(3, "VIDIOC_S_CROP failed. "
1766                                        "Unmap the buffers first.");
1767                                 return -EINVAL;
1768                         }
1769
1770         /* Preserve R,G or B origin */
1771         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1772         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1773
1774         if (rect->width < 16)
1775                 rect->width = 16;
1776         if (rect->height < 16)
1777                 rect->height = 16;
1778         if (rect->width > bounds->width)
1779                 rect->width = bounds->width;
1780         if (rect->height > bounds->height)
1781                 rect->height = bounds->height;
1782         if (rect->left < bounds->left)
1783                 rect->left = bounds->left;
1784         if (rect->top < bounds->top)
1785                 rect->top = bounds->top;
1786         if (rect->left + rect->width > bounds->left + bounds->width)
1787                 rect->left = bounds->left+bounds->width - rect->width;
1788         if (rect->top + rect->height > bounds->top + bounds->height)
1789                 rect->top = bounds->top+bounds->height - rect->height;
1790
1791         rect->width &= ~15L;
1792         rect->height &= ~15L;
1793
1794         if (ET61X251_PRESERVE_IMGSCALE) {
1795                 /* Calculate the actual scaling factor */
1796                 u32 a, b;
1797                 a = rect->width * rect->height;
1798                 b = pix_format->width * pix_format->height;
1799                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1800         } else
1801                 scale = 1;
1802
1803         if (cam->stream == STREAM_ON)
1804                 if ((err = et61x251_stream_interrupt(cam)))
1805                         return err;
1806
1807         if (copy_to_user(arg, &crop, sizeof(crop))) {
1808                 cam->stream = stream;
1809                 return -EFAULT;
1810         }
1811
1812         if (cam->module_param.force_munmap || cam->io == IO_READ)
1813                 et61x251_release_buffers(cam);
1814
1815         err = et61x251_set_crop(cam, rect);
1816         if (s->set_crop)
1817                 err += s->set_crop(cam, rect);
1818         err += et61x251_set_scale(cam, scale);
1819
1820         if (err) { /* atomic, no rollback in ioctl() */
1821                 cam->state |= DEV_MISCONFIGURED;
1822                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1823                        "use the camera, close and open /dev/video%d again.",
1824                     cam->v4ldev->minor);
1825                 return -EIO;
1826         }
1827
1828         s->pix_format.width = rect->width/scale;
1829         s->pix_format.height = rect->height/scale;
1830         memcpy(&(s->_rect), rect, sizeof(*rect));
1831
1832         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1833             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1834                 cam->state |= DEV_MISCONFIGURED;
1835                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1836                        "use the camera, close and open /dev/video%d again.",
1837                     cam->v4ldev->minor);
1838                 return -ENOMEM;
1839         }
1840
1841         if (cam->io == IO_READ)
1842                 et61x251_empty_framequeues(cam);
1843         else if (cam->module_param.force_munmap)
1844                 et61x251_requeue_outqueue(cam);
1845
1846         cam->stream = stream;
1847
1848         return 0;
1849 }
1850
1851
1852 static int
1853 et61x251_vidioc_enum_framesizes(struct et61x251_device* cam, void __user * arg)
1854 {
1855         struct v4l2_frmsizeenum frmsize;
1856
1857         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1858                 return -EFAULT;
1859
1860         if (frmsize.index != 0)
1861                 return -EINVAL;
1862
1863         if (frmsize.pixel_format != V4L2_PIX_FMT_ET61X251 &&
1864             frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
1865                 return -EINVAL;
1866
1867         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
1868         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
1869         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
1870         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
1871         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
1872         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1873
1874         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1875                 return -EFAULT;
1876
1877         return 0;
1878 }
1879
1880
1881 static int
1882 et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1883 {
1884         struct v4l2_fmtdesc fmtd;
1885
1886         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1887                 return -EFAULT;
1888
1889         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1890                 return -EINVAL;
1891
1892         if (fmtd.index == 0) {
1893                 strcpy(fmtd.description, "bayer rgb");
1894                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1895         } else if (fmtd.index == 1) {
1896                 strcpy(fmtd.description, "compressed");
1897                 fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1898                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1899         } else
1900                 return -EINVAL;
1901
1902         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1903         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1904
1905         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1906                 return -EFAULT;
1907
1908         return 0;
1909 }
1910
1911
1912 static int
1913 et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1914 {
1915         struct v4l2_format format;
1916         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1917
1918         if (copy_from_user(&format, arg, sizeof(format)))
1919                 return -EFAULT;
1920
1921         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1922                 return -EINVAL;
1923
1924         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1925                              ? 0 : (pfmt->width * pfmt->priv) / 8;
1926         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1927         pfmt->field = V4L2_FIELD_NONE;
1928         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1929
1930         if (copy_to_user(arg, &format, sizeof(format)))
1931                 return -EFAULT;
1932
1933         return 0;
1934 }
1935
1936
1937 static int
1938 et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1939                           void __user * arg)
1940 {
1941         struct et61x251_sensor* s = &cam->sensor;
1942         struct v4l2_format format;
1943         struct v4l2_pix_format* pix;
1944         struct v4l2_pix_format* pfmt = &(s->pix_format);
1945         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1946         struct v4l2_rect rect;
1947         u8 scale;
1948         const enum et61x251_stream_state stream = cam->stream;
1949         const u32 nbuffers = cam->nbuffers;
1950         u32 i;
1951         int err = 0;
1952
1953         if (copy_from_user(&format, arg, sizeof(format)))
1954                 return -EFAULT;
1955
1956         pix = &(format.fmt.pix);
1957
1958         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1959                 return -EINVAL;
1960
1961         memcpy(&rect, &(s->_rect), sizeof(rect));
1962
1963         { /* calculate the actual scaling factor */
1964                 u32 a, b;
1965                 a = rect.width * rect.height;
1966                 b = pix->width * pix->height;
1967                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1968         }
1969
1970         rect.width = scale * pix->width;
1971         rect.height = scale * pix->height;
1972
1973         if (rect.width < 16)
1974                 rect.width = 16;
1975         if (rect.height < 16)
1976                 rect.height = 16;
1977         if (rect.width > bounds->left + bounds->width - rect.left)
1978                 rect.width = bounds->left + bounds->width - rect.left;
1979         if (rect.height > bounds->top + bounds->height - rect.top)
1980                 rect.height = bounds->top + bounds->height - rect.top;
1981
1982         rect.width &= ~15L;
1983         rect.height &= ~15L;
1984
1985         { /* adjust the scaling factor */
1986                 u32 a, b;
1987                 a = rect.width * rect.height;
1988                 b = pix->width * pix->height;
1989                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1990         }
1991
1992         pix->width = rect.width / scale;
1993         pix->height = rect.height / scale;
1994
1995         if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
1996             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
1997                 pix->pixelformat = pfmt->pixelformat;
1998         pix->priv = pfmt->priv; /* bpp */
1999         pix->colorspace = pfmt->colorspace;
2000         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
2001                             ? 0 : (pix->width * pix->priv) / 8;
2002         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2003         pix->field = V4L2_FIELD_NONE;
2004
2005         if (cmd == VIDIOC_TRY_FMT) {
2006                 if (copy_to_user(arg, &format, sizeof(format)))
2007                         return -EFAULT;
2008                 return 0;
2009         }
2010
2011         if (cam->module_param.force_munmap)
2012                 for (i = 0; i < cam->nbuffers; i++)
2013                         if (cam->frame[i].vma_use_count) {
2014                                 DBG(3, "VIDIOC_S_FMT failed. "
2015                                        "Unmap the buffers first.");
2016                                 return -EINVAL;
2017                         }
2018
2019         if (cam->stream == STREAM_ON)
2020                 if ((err = et61x251_stream_interrupt(cam)))
2021                         return err;
2022
2023         if (copy_to_user(arg, &format, sizeof(format))) {
2024                 cam->stream = stream;
2025                 return -EFAULT;
2026         }
2027
2028         if (cam->module_param.force_munmap || cam->io == IO_READ)
2029                 et61x251_release_buffers(cam);
2030
2031         err += et61x251_set_pix_format(cam, pix);
2032         err += et61x251_set_crop(cam, &rect);
2033         if (s->set_pix_format)
2034                 err += s->set_pix_format(cam, pix);
2035         if (s->set_crop)
2036                 err += s->set_crop(cam, &rect);
2037         err += et61x251_set_scale(cam, scale);
2038
2039         if (err) { /* atomic, no rollback in ioctl() */
2040                 cam->state |= DEV_MISCONFIGURED;
2041                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2042                        "use the camera, close and open /dev/video%d again.",
2043                     cam->v4ldev->minor);
2044                 return -EIO;
2045         }
2046
2047         memcpy(pfmt, pix, sizeof(*pix));
2048         memcpy(&(s->_rect), &rect, sizeof(rect));
2049
2050         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2051             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2052                 cam->state |= DEV_MISCONFIGURED;
2053                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2054                        "use the camera, close and open /dev/video%d again.",
2055                     cam->v4ldev->minor);
2056                 return -ENOMEM;
2057         }
2058
2059         if (cam->io == IO_READ)
2060                 et61x251_empty_framequeues(cam);
2061         else if (cam->module_param.force_munmap)
2062                 et61x251_requeue_outqueue(cam);
2063
2064         cam->stream = stream;
2065
2066         return 0;
2067 }
2068
2069
2070 static int
2071 et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2072 {
2073         if (copy_to_user(arg, &cam->compression,
2074                          sizeof(cam->compression)))
2075                 return -EFAULT;
2076
2077         return 0;
2078 }
2079
2080
2081 static int
2082 et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2083 {
2084         struct v4l2_jpegcompression jc;
2085         const enum et61x251_stream_state stream = cam->stream;
2086         int err = 0;
2087
2088         if (copy_from_user(&jc, arg, sizeof(jc)))
2089                 return -EFAULT;
2090
2091         if (jc.quality != 0 && jc.quality != 1)
2092                 return -EINVAL;
2093
2094         if (cam->stream == STREAM_ON)
2095                 if ((err = et61x251_stream_interrupt(cam)))
2096                         return err;
2097
2098         err += et61x251_set_compression(cam, &jc);
2099         if (err) { /* atomic, no rollback in ioctl() */
2100                 cam->state |= DEV_MISCONFIGURED;
2101                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2102                        "problems. To use the camera, close and open "
2103                        "/dev/video%d again.", cam->v4ldev->minor);
2104                 return -EIO;
2105         }
2106
2107         cam->compression.quality = jc.quality;
2108
2109         cam->stream = stream;
2110
2111         return 0;
2112 }
2113
2114
2115 static int
2116 et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2117 {
2118         struct v4l2_requestbuffers rb;
2119         u32 i;
2120         int err;
2121
2122         if (copy_from_user(&rb, arg, sizeof(rb)))
2123                 return -EFAULT;
2124
2125         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2126             rb.memory != V4L2_MEMORY_MMAP)
2127                 return -EINVAL;
2128
2129         if (cam->io == IO_READ) {
2130                 DBG(3, "Close and open the device again to choose the mmap "
2131                        "I/O method");
2132                 return -EINVAL;
2133         }
2134
2135         for (i = 0; i < cam->nbuffers; i++)
2136                 if (cam->frame[i].vma_use_count) {
2137                         DBG(3, "VIDIOC_REQBUFS failed. "
2138                                "Previous buffers are still mapped.");
2139                         return -EINVAL;
2140                 }
2141
2142         if (cam->stream == STREAM_ON)
2143                 if ((err = et61x251_stream_interrupt(cam)))
2144                         return err;
2145
2146         et61x251_empty_framequeues(cam);
2147
2148         et61x251_release_buffers(cam);
2149         if (rb.count)
2150                 rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2151
2152         if (copy_to_user(arg, &rb, sizeof(rb))) {
2153                 et61x251_release_buffers(cam);
2154                 cam->io = IO_NONE;
2155                 return -EFAULT;
2156         }
2157
2158         cam->io = rb.count ? IO_MMAP : IO_NONE;
2159
2160         return 0;
2161 }
2162
2163
2164 static int
2165 et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2166 {
2167         struct v4l2_buffer b;
2168
2169         if (copy_from_user(&b, arg, sizeof(b)))
2170                 return -EFAULT;
2171
2172         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2173             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2174                 return -EINVAL;
2175
2176         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2177
2178         if (cam->frame[b.index].vma_use_count)
2179                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2180
2181         if (cam->frame[b.index].state == F_DONE)
2182                 b.flags |= V4L2_BUF_FLAG_DONE;
2183         else if (cam->frame[b.index].state != F_UNUSED)
2184                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2185
2186         if (copy_to_user(arg, &b, sizeof(b)))
2187                 return -EFAULT;
2188
2189         return 0;
2190 }
2191
2192
2193 static int
2194 et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2195 {
2196         struct v4l2_buffer b;
2197         unsigned long lock_flags;
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         if (cam->frame[b.index].state != F_UNUSED)
2207                 return -EINVAL;
2208
2209         cam->frame[b.index].state = F_QUEUED;
2210
2211         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2212         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2213         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2214
2215         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2216
2217         return 0;
2218 }
2219
2220
2221 static int
2222 et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2223                       void __user * arg)
2224 {
2225         struct v4l2_buffer b;
2226         struct et61x251_frame_t *f;
2227         unsigned long lock_flags;
2228         long timeout;
2229
2230         if (copy_from_user(&b, arg, sizeof(b)))
2231                 return -EFAULT;
2232
2233         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2234                 return -EINVAL;
2235
2236         if (list_empty(&cam->outqueue)) {
2237                 if (cam->stream == STREAM_OFF)
2238                         return -EINVAL;
2239                 if (filp->f_flags & O_NONBLOCK)
2240                         return -EAGAIN;
2241                 timeout = wait_event_interruptible_timeout
2242                           ( cam->wait_frame,
2243                             (!list_empty(&cam->outqueue)) ||
2244                             (cam->state & DEV_DISCONNECTED) ||
2245                             (cam->state & DEV_MISCONFIGURED),
2246                             cam->module_param.frame_timeout *
2247                             1000 * msecs_to_jiffies(1) );
2248                 if (timeout < 0)
2249                         return timeout;
2250                 if (cam->state & DEV_DISCONNECTED)
2251                         return -ENODEV;
2252                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2253                         return -EIO;
2254         }
2255
2256         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2257         f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2258         list_del(cam->outqueue.next);
2259         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2260
2261         f->state = F_UNUSED;
2262
2263         memcpy(&b, &f->buf, sizeof(b));
2264         if (f->vma_use_count)
2265                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2266
2267         if (copy_to_user(arg, &b, sizeof(b)))
2268                 return -EFAULT;
2269
2270         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2271
2272         return 0;
2273 }
2274
2275
2276 static int
2277 et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2278 {
2279         int type;
2280
2281         if (copy_from_user(&type, arg, sizeof(type)))
2282                 return -EFAULT;
2283
2284         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2285                 return -EINVAL;
2286
2287         if (list_empty(&cam->inqueue))
2288                 return -EINVAL;
2289
2290         cam->stream = STREAM_ON;
2291
2292         DBG(3, "Stream on");
2293
2294         return 0;
2295 }
2296
2297
2298 static int
2299 et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2300 {
2301         int type, err;
2302
2303         if (copy_from_user(&type, arg, sizeof(type)))
2304                 return -EFAULT;
2305
2306         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2307                 return -EINVAL;
2308
2309         if (cam->stream == STREAM_ON)
2310                 if ((err = et61x251_stream_interrupt(cam)))
2311                         return err;
2312
2313         et61x251_empty_framequeues(cam);
2314
2315         DBG(3, "Stream off");
2316
2317         return 0;
2318 }
2319
2320
2321 static int
2322 et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2323 {
2324         struct v4l2_streamparm sp;
2325
2326         if (copy_from_user(&sp, arg, sizeof(sp)))
2327                 return -EFAULT;
2328
2329         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2330                 return -EINVAL;
2331
2332         sp.parm.capture.extendedmode = 0;
2333         sp.parm.capture.readbuffers = cam->nreadbuffers;
2334
2335         if (copy_to_user(arg, &sp, sizeof(sp)))
2336                 return -EFAULT;
2337
2338         return 0;
2339 }
2340
2341
2342 static int
2343 et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2344 {
2345         struct v4l2_streamparm sp;
2346
2347         if (copy_from_user(&sp, arg, sizeof(sp)))
2348                 return -EFAULT;
2349
2350         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2351                 return -EINVAL;
2352
2353         sp.parm.capture.extendedmode = 0;
2354
2355         if (sp.parm.capture.readbuffers == 0)
2356                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2357
2358         if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2359                 sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2360
2361         if (copy_to_user(arg, &sp, sizeof(sp)))
2362                 return -EFAULT;
2363
2364         cam->nreadbuffers = sp.parm.capture.readbuffers;
2365
2366         return 0;
2367 }
2368
2369
2370 static int et61x251_ioctl_v4l2(struct inode* inode, struct file* filp,
2371                                unsigned int cmd, void __user * arg)
2372 {
2373         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2374
2375         switch (cmd) {
2376
2377         case VIDIOC_QUERYCAP:
2378                 return et61x251_vidioc_querycap(cam, arg);
2379
2380         case VIDIOC_ENUMINPUT:
2381                 return et61x251_vidioc_enuminput(cam, arg);
2382
2383         case VIDIOC_G_INPUT:
2384                 return et61x251_vidioc_g_input(cam, arg);
2385
2386         case VIDIOC_S_INPUT:
2387                 return et61x251_vidioc_s_input(cam, arg);
2388
2389         case VIDIOC_QUERYCTRL:
2390                 return et61x251_vidioc_query_ctrl(cam, arg);
2391
2392         case VIDIOC_G_CTRL:
2393                 return et61x251_vidioc_g_ctrl(cam, arg);
2394
2395         case VIDIOC_S_CTRL:
2396                 return et61x251_vidioc_s_ctrl(cam, arg);
2397
2398         case VIDIOC_CROPCAP:
2399                 return et61x251_vidioc_cropcap(cam, arg);
2400
2401         case VIDIOC_G_CROP:
2402                 return et61x251_vidioc_g_crop(cam, arg);
2403
2404         case VIDIOC_S_CROP:
2405                 return et61x251_vidioc_s_crop(cam, arg);
2406
2407         case VIDIOC_ENUM_FMT:
2408                 return et61x251_vidioc_enum_fmt(cam, arg);
2409
2410         case VIDIOC_G_FMT:
2411                 return et61x251_vidioc_g_fmt(cam, arg);
2412
2413         case VIDIOC_TRY_FMT:
2414         case VIDIOC_S_FMT:
2415                 return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2416
2417         case VIDIOC_ENUM_FRAMESIZES:
2418                 return et61x251_vidioc_enum_framesizes(cam, arg);
2419
2420         case VIDIOC_G_JPEGCOMP:
2421                 return et61x251_vidioc_g_jpegcomp(cam, arg);
2422
2423         case VIDIOC_S_JPEGCOMP:
2424                 return et61x251_vidioc_s_jpegcomp(cam, arg);
2425
2426         case VIDIOC_REQBUFS:
2427                 return et61x251_vidioc_reqbufs(cam, arg);
2428
2429         case VIDIOC_QUERYBUF:
2430                 return et61x251_vidioc_querybuf(cam, arg);
2431
2432         case VIDIOC_QBUF:
2433                 return et61x251_vidioc_qbuf(cam, arg);
2434
2435         case VIDIOC_DQBUF:
2436                 return et61x251_vidioc_dqbuf(cam, filp, arg);
2437
2438         case VIDIOC_STREAMON:
2439                 return et61x251_vidioc_streamon(cam, arg);
2440
2441         case VIDIOC_STREAMOFF:
2442                 return et61x251_vidioc_streamoff(cam, arg);
2443
2444         case VIDIOC_G_PARM:
2445                 return et61x251_vidioc_g_parm(cam, arg);
2446
2447         case VIDIOC_S_PARM:
2448                 return et61x251_vidioc_s_parm(cam, arg);
2449
2450         case VIDIOC_G_STD:
2451         case VIDIOC_S_STD:
2452         case VIDIOC_QUERYSTD:
2453         case VIDIOC_ENUMSTD:
2454         case VIDIOC_QUERYMENU:
2455         case VIDIOC_ENUM_FRAMEINTERVALS:
2456                 return -EINVAL;
2457
2458         default:
2459                 return -EINVAL;
2460
2461         }
2462 }
2463
2464
2465 static int et61x251_ioctl(struct inode* inode, struct file* filp,
2466                          unsigned int cmd, unsigned long arg)
2467 {
2468         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2469         int err = 0;
2470
2471         if (mutex_lock_interruptible(&cam->fileop_mutex))
2472                 return -ERESTARTSYS;
2473
2474         if (cam->state & DEV_DISCONNECTED) {
2475                 DBG(1, "Device not present");
2476                 mutex_unlock(&cam->fileop_mutex);
2477                 return -ENODEV;
2478         }
2479
2480         if (cam->state & DEV_MISCONFIGURED) {
2481                 DBG(1, "The camera is misconfigured. Close and open it "
2482                        "again.");
2483                 mutex_unlock(&cam->fileop_mutex);
2484                 return -EIO;
2485         }
2486
2487         V4LDBG(3, "et61x251", cmd);
2488
2489         err = et61x251_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2490
2491         mutex_unlock(&cam->fileop_mutex);
2492
2493         return err;
2494 }
2495
2496
2497 static const struct file_operations et61x251_fops = {
2498         .owner = THIS_MODULE,
2499         .open =    et61x251_open,
2500         .release = et61x251_release,
2501         .ioctl =   et61x251_ioctl,
2502         .compat_ioctl = v4l_compat_ioctl32,
2503         .read =    et61x251_read,
2504         .poll =    et61x251_poll,
2505         .mmap =    et61x251_mmap,
2506         .llseek =  no_llseek,
2507 };
2508
2509 /*****************************************************************************/
2510
2511 /* It exists a single interface only. We do not need to validate anything. */
2512 static int
2513 et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2514 {
2515         struct usb_device *udev = interface_to_usbdev(intf);
2516         struct et61x251_device* cam;
2517         static unsigned int dev_nr = 0;
2518         unsigned int i;
2519         int err = 0;
2520
2521         if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2522                 return -ENOMEM;
2523
2524         cam->usbdev = udev;
2525
2526         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2527                 DBG(1, "kmalloc() failed");
2528                 err = -ENOMEM;
2529                 goto fail;
2530         }
2531
2532         if (!(cam->v4ldev = video_device_alloc())) {
2533                 DBG(1, "video_device_alloc() failed");
2534                 err = -ENOMEM;
2535                 goto fail;
2536         }
2537
2538         mutex_init(&cam->dev_mutex);
2539
2540         DBG(2, "ET61X[12]51 PC Camera Controller detected "
2541                "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
2542
2543         for  (i = 0; et61x251_sensor_table[i]; i++) {
2544                 err = et61x251_sensor_table[i](cam);
2545                 if (!err)
2546                         break;
2547         }
2548
2549         if (!err)
2550                 DBG(2, "%s image sensor detected", cam->sensor.name);
2551         else {
2552                 DBG(1, "No supported image sensor detected");
2553                 err = -ENODEV;
2554                 goto fail;
2555         }
2556
2557         if (et61x251_init(cam)) {
2558                 DBG(1, "Initialization failed. I will retry on open().");
2559                 cam->state |= DEV_MISCONFIGURED;
2560         }
2561
2562         strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2563         cam->v4ldev->owner = THIS_MODULE;
2564         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2565         cam->v4ldev->hardware = 0;
2566         cam->v4ldev->fops = &et61x251_fops;
2567         cam->v4ldev->minor = video_nr[dev_nr];
2568         cam->v4ldev->release = video_device_release;
2569         video_set_drvdata(cam->v4ldev, cam);
2570
2571         mutex_lock(&cam->dev_mutex);
2572
2573         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2574                                     video_nr[dev_nr]);
2575         if (err) {
2576                 DBG(1, "V4L2 device registration failed");
2577                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2578                         DBG(1, "Free /dev/videoX node not found");
2579                 video_nr[dev_nr] = -1;
2580                 dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2581                 mutex_unlock(&cam->dev_mutex);
2582                 goto fail;
2583         }
2584
2585         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2586
2587         cam->module_param.force_munmap = force_munmap[dev_nr];
2588         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2589
2590         dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2591
2592 #ifdef CONFIG_VIDEO_ADV_DEBUG
2593         err = et61x251_create_sysfs(cam);
2594         if (!err)
2595                 DBG(2, "Optional device control through 'sysfs' "
2596                        "interface ready");
2597         else
2598                 DBG(2, "Failed to create 'sysfs' interface for optional "
2599                        "device controlling. Error #%d", err);
2600 #else
2601         DBG(2, "Optional device control through 'sysfs' interface disabled");
2602 #endif
2603
2604         usb_set_intfdata(intf, cam);
2605
2606         mutex_unlock(&cam->dev_mutex);
2607
2608         return 0;
2609
2610 fail:
2611         if (cam) {
2612                 kfree(cam->control_buffer);
2613                 if (cam->v4ldev)
2614                         video_device_release(cam->v4ldev);
2615                 kfree(cam);
2616         }
2617         return err;
2618 }
2619
2620
2621 static void et61x251_usb_disconnect(struct usb_interface* intf)
2622 {
2623         struct et61x251_device* cam = usb_get_intfdata(intf);
2624
2625         if (!cam)
2626                 return;
2627
2628         down_write(&et61x251_disconnect);
2629
2630         mutex_lock(&cam->dev_mutex);
2631
2632         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2633
2634         wake_up_interruptible_all(&cam->open);
2635
2636         if (cam->users) {
2637                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2638                        "memory deallocation are deferred on close.",
2639                     cam->v4ldev->minor);
2640                 cam->state |= DEV_MISCONFIGURED;
2641                 et61x251_stop_transfer(cam);
2642                 cam->state |= DEV_DISCONNECTED;
2643                 wake_up_interruptible(&cam->wait_frame);
2644                 wake_up(&cam->wait_stream);
2645                 usb_get_dev(cam->usbdev);
2646         } else {
2647                 cam->state |= DEV_DISCONNECTED;
2648                 et61x251_release_resources(cam);
2649         }
2650
2651         mutex_unlock(&cam->dev_mutex);
2652
2653         if (!cam->users)
2654                 kfree(cam);
2655
2656         up_write(&et61x251_disconnect);
2657 }
2658
2659
2660 static struct usb_driver et61x251_usb_driver = {
2661         .name =       "et61x251",
2662         .id_table =   et61x251_id_table,
2663         .probe =      et61x251_usb_probe,
2664         .disconnect = et61x251_usb_disconnect,
2665 };
2666
2667 /*****************************************************************************/
2668
2669 static int __init et61x251_module_init(void)
2670 {
2671         int err = 0;
2672
2673         KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2674         KDBG(3, ET61X251_MODULE_AUTHOR);
2675
2676         if ((err = usb_register(&et61x251_usb_driver)))
2677                 KDBG(1, "usb_register() failed");
2678
2679         return err;
2680 }
2681
2682
2683 static void __exit et61x251_module_exit(void)
2684 {
2685         usb_deregister(&et61x251_usb_driver);
2686 }
2687
2688
2689 module_init(et61x251_module_init);
2690 module_exit(et61x251_module_exit);