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) 2006-2007 Luca Risolia"
  49 #define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  50 #define ET61X251_MODULE_LICENSE "GPL"
  51 #define ET61X251_MODULE_VERSION "1:1.09"
  52 #define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 9)
  53
  54 /*****************************************************************************/
  55
  56 MODULE_DEVICE_TABLE(usb, et61x251_id_table);
  57
  58 MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
  59 MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
  60 MODULE_VERSION(ET61X251_MODULE_VERSION);
  61 MODULE_LICENSE(ET61X251_MODULE_LICENSE);
  62
  63 static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
  64 module_param_array(video_nr, short, NULL, 0444);
  65 MODULE_PARM_DESC(video_nr,
  66                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  67                  "\n -1 = use next available (default)"
  68                  "\n  n = use minor number n (integer >= 0)"
  69                  "\nYou can specify up to "
  70                  __MODULE_STRING(ET61X251_MAX_DEVICES) " cameras this way."
  71                  "\nFor example:"
  72                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  73                  "\nthe second registered camera and use auto for the first"
  74                  "\none and for every other camera."
  75                  "\n");
  76
  77 static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  78                                ET61X251_FORCE_MUNMAP};
  79 module_param_array(force_munmap, bool, NULL, 0444);
  80 MODULE_PARM_DESC(force_munmap,
  81                  "\n<0|1[,...]> Force the application to unmap previously"
  82                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  83                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  84                  "\nthis feature. This parameter is specific for each"
  85                  "\ndetected camera."
  86                  "\n 0 = do not force memory unmapping"
  87                  "\n 1 = force memory unmapping (save memory)"
  88                  "\nDefault value is "__MODULE_STRING(ET61X251_FORCE_MUNMAP)"."
  89                  "\n");
  90
  91 static unsigned int frame_timeout[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  92                                        ET61X251_FRAME_TIMEOUT};
  93 module_param_array(frame_timeout, uint, NULL, 0644);
  94 MODULE_PARM_DESC(frame_timeout,
  95                  "\n<n[,...]> Timeout for a video frame in seconds."
  96                  "\nThis parameter is specific for each detected camera."
  97                  "\nDefault value is "
  98                  __MODULE_STRING(ET61X251_FRAME_TIMEOUT)"."
  99                  "\n");
 100
 101 #ifdef ET61X251_DEBUG
 102 static unsigned short debug = ET61X251_DEBUG_LEVEL;
 103 module_param(debug, ushort, 0644);
 104 MODULE_PARM_DESC(debug,
 105                  "\n<n> Debugging information level, from 0 to 3:"
 106                  "\n0 = none (use carefully)"
 107                  "\n1 = critical errors"
 108                  "\n2 = significant informations"
 109                  "\n3 = more verbose messages"
 110                  "\nLevel 3 is useful for testing only, when only "
 111                  "one device is used."
 112                  "\nDefault value is "__MODULE_STRING(ET61X251_DEBUG_LEVEL)"."
 113                  "\n");
 114 #endif
 115
 116 /*****************************************************************************/
 117
 118 static u32
 119 et61x251_request_buffers(struct et61x251_device* cam, u32 count,
 120                          enum et61x251_io_method io)
 121 {
 122         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 123         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 124         const size_t imagesize = cam->module_param.force_munmap ||
 125                                  io == IO_READ ?
 126                                  (p->width * p->height * p->priv) / 8 :
 127                                  (r->width * r->height * p->priv) / 8;
 128         void* buff = NULL;
 129         u32 i;
 130
 131         if (count > ET61X251_MAX_FRAMES)
 132                 count = ET61X251_MAX_FRAMES;
 133
 134         cam->nbuffers = count;
 135         while (cam->nbuffers > 0) {
 136                 if ((buff = vmalloc_32_user(cam->nbuffers *
 137                                             PAGE_ALIGN(imagesize))))
 138                         break;
 139                 cam->nbuffers--;
 140         }
 141
 142         for (i = 0; i < cam->nbuffers; i++) {
 143                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 144                 cam->frame[i].buf.index = i;
 145                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 146                 cam->frame[i].buf.length = imagesize;
 147                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 148                 cam->frame[i].buf.sequence = 0;
 149                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 150                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 151                 cam->frame[i].buf.flags = 0;
 152         }
 153
 154         return cam->nbuffers;
 155 }
 156
 157
 158 static void et61x251_release_buffers(struct et61x251_device* cam)
 159 {
 160         if (cam->nbuffers) {
 161                 vfree(cam->frame[0].bufmem);
 162                 cam->nbuffers = 0;
 163         }
 164         cam->frame_current = NULL;
 165 }
 166
 167
 168 static void et61x251_empty_framequeues(struct et61x251_device* cam)
 169 {
 170         u32 i;
 171
 172         INIT_LIST_HEAD(&cam->inqueue);
 173         INIT_LIST_HEAD(&cam->outqueue);
 174
 175         for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
 176                 cam->frame[i].state = F_UNUSED;
 177                 cam->frame[i].buf.bytesused = 0;
 178         }
 179 }
 180
 181
 182 static void et61x251_requeue_outqueue(struct et61x251_device* cam)
 183 {
 184         struct et61x251_frame_t *i;
 185
 186         list_for_each_entry(i, &cam->outqueue, frame) {
 187                 i->state = F_QUEUED;
 188                 list_add(&i->frame, &cam->inqueue);
 189         }
 190
 191         INIT_LIST_HEAD(&cam->outqueue);
 192 }
 193
 194
 195 static void et61x251_queue_unusedframes(struct et61x251_device* cam)
 196 {
 197         unsigned long lock_flags;
 198         u32 i;
 199
 200         for (i = 0; i < cam->nbuffers; i++)
 201                 if (cam->frame[i].state == F_UNUSED) {
 202                         cam->frame[i].state = F_QUEUED;
 203                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 204                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 205                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 206                 }
 207 }
 208
 209 /*****************************************************************************/
 210
 211 int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
 212 {
 213         struct usb_device* udev = cam->usbdev;
 214         u8* buff = cam->control_buffer;
 215         int res;
 216
 217         *buff = value;
 218
 219         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 220                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 221         if (res < 0) {
 222                 DBG(3, "Failed to write a register (value 0x%02X, index "
 223                        "0x%02X, error %d)", value, index, res);
 224                 return -1;
 225         }
 226
 227         return 0;
 228 }
 229
 230
 231 int et61x251_read_reg(struct et61x251_device* cam, u16 index)
 232 {
 233         struct usb_device* udev = cam->usbdev;
 234         u8* buff = cam->control_buffer;
 235         int res;
 236
 237         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 238                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 239         if (res < 0)
 240                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 241                     index, res);
 242
 243         return (res >= 0) ? (int)(*buff) : -1;
 244 }
 245
 246
 247 static int
 248 et61x251_i2c_wait(struct et61x251_device* cam,
 249                   const struct et61x251_sensor* sensor)
 250 {
 251         int i, r;
 252
 253         for (i = 1; i <= 8; i++) {
 254                 if (sensor->interface == ET61X251_I2C_3WIRES) {
 255                         r = et61x251_read_reg(cam, 0x8e);
 256                         if (!(r & 0x02) && (r >= 0))
 257                                 return 0;
 258                 } else {
 259                         r = et61x251_read_reg(cam, 0x8b);
 260                         if (!(r & 0x01) && (r >= 0))
 261                                 return 0;
 262                 }
 263                 if (r < 0)
 264                         return -EIO;
 265                 udelay(8*8); /* minimum for sensors at 400kHz */
 266         }
 267
 268         return -EBUSY;
 269 }
 270
 271
 272 int
 273 et61x251_i2c_try_read(struct et61x251_device* cam,
 274                       const struct et61x251_sensor* sensor, u8 address)
 275 {
 276         struct usb_device* udev = cam->usbdev;
 277         u8* data = cam->control_buffer;
 278         int err = 0, res;
 279
 280         data[0] = address;
 281         data[1] = cam->sensor.i2c_slave_id;
 282         data[2] = cam->sensor.rsta | 0x10;
 283         data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
 284         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 285                               0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
 286         if (res < 0)
 287                 err += res;
 288
 289         err += et61x251_i2c_wait(cam, sensor);
 290
 291         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 292                               0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
 293         if (res < 0)
 294                 err += res;
 295
 296         if (err)
 297                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 298
 299         PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
 300
 301         return err ? -1 : (int)data[0];
 302 }
 303
 304
 305 int
 306 et61x251_i2c_try_write(struct et61x251_device* cam,
 307                        const struct et61x251_sensor* sensor, u8 address,
 308                        u8 value)
 309 {
 310         struct usb_device* udev = cam->usbdev;
 311         u8* data = cam->control_buffer;
 312         int err = 0, res;
 313
 314         data[0] = address;
 315         data[1] = cam->sensor.i2c_slave_id;
 316         data[2] = cam->sensor.rsta | 0x12;
 317         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 318                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 319         if (res < 0)
 320                 err += res;
 321
 322         data[0] = value;
 323         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 324                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 325         if (res < 0)
 326                 err += res;
 327
 328         err += et61x251_i2c_wait(cam, sensor);
 329
 330         if (err)
 331                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 332
 333         PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
 334
 335         return err ? -1 : 0;
 336 }
 337
 338
 339 int
 340 et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
 341                        u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
 342                        u8 data8, u8 address)
 343 {
 344         struct usb_device* udev = cam->usbdev;
 345         u8* data = cam->control_buffer;
 346         int err = 0, res;
 347
 348         data[0] = data2;
 349         data[1] = data3;
 350         data[2] = data4;
 351         data[3] = data5;
 352         data[4] = data6;
 353         data[5] = data7;
 354         data[6] = data8;
 355         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 356                               0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
 357         if (res < 0)
 358                 err += res;
 359
 360         data[0] = address;
 361         data[1] = cam->sensor.i2c_slave_id;
 362         data[2] = cam->sensor.rsta | 0x02 | (n << 4);
 363         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 364                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 365         if (res < 0)
 366                 err += res;
 367
 368         /* Start writing through the serial interface */
 369         data[0] = data1;
 370         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 371                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 372         if (res < 0)
 373                 err += res;
 374
 375         err += et61x251_i2c_wait(cam, &cam->sensor);
 376
 377         if (err)
 378                 DBG(3, "I2C raw write failed for %s image sensor",
 379                     cam->sensor.name);
 380
 381         PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
 382               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
 383               " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
 384               data1, data2, data3, data4, data5, data6, data7, data8);
 385
 386         return err ? -1 : 0;
 387
 388 }
 389
 390
 391 int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
 392 {
 393         return et61x251_i2c_try_read(cam, &cam->sensor, address);
 394 }
 395
 396
 397 int et61x251_i2c_write(struct et61x251_device* cam, u8 address, u8 value)
 398 {
 399         return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
 400 }
 401
 402 /*****************************************************************************/
 403
 404 static void et61x251_urb_complete(struct urb *urb)
 405 {
 406         struct et61x251_device* cam = urb->context;
 407         struct et61x251_frame_t** f;
 408         size_t imagesize;
 409         u8 i;
 410         int err = 0;
 411
 412         if (urb->status == -ENOENT)
 413                 return;
 414
 415         f = &cam->frame_current;
 416
 417         if (cam->stream == STREAM_INTERRUPT) {
 418                 cam->stream = STREAM_OFF;
 419                 if ((*f))
 420                         (*f)->state = F_QUEUED;
 421                 DBG(3, "Stream interrupted");
 422                 wake_up(&cam->wait_stream);
 423         }
 424
 425         if (cam->state & DEV_DISCONNECTED)
 426                 return;
 427
 428         if (cam->state & DEV_MISCONFIGURED) {
 429                 wake_up_interruptible(&cam->wait_frame);
 430                 return;
 431         }
 432
 433         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 434                 goto resubmit_urb;
 435
 436         if (!(*f))
 437                 (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
 438                                   frame);
 439
 440         imagesize = (cam->sensor.pix_format.width *
 441                      cam->sensor.pix_format.height *
 442                      cam->sensor.pix_format.priv) / 8;
 443
 444         for (i = 0; i < urb->number_of_packets; i++) {
 445                 unsigned int len, status;
 446                 void *pos;
 447                 u8* b1, * b2, sof;
 448                 const u8 VOID_BYTES = 6;
 449                 size_t imglen;
 450
 451                 len = urb->iso_frame_desc[i].actual_length;
 452                 status = urb->iso_frame_desc[i].status;
 453                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 454
 455                 if (status) {
 456                         DBG(3, "Error in isochronous frame");
 457                         (*f)->state = F_ERROR;
 458                         continue;
 459                 }
 460
 461                 b1 = pos++;
 462                 b2 = pos++;
 463                 sof = ((*b1 & 0x3f) == 63);
 464                 imglen = ((*b1 & 0xc0) << 2) | *b2;
 465
 466                 PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
 467                       len, i, imglen);
 468
 469                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 470 start_of_frame:
 471                         if (sof) {
 472                                 (*f)->state = F_GRABBING;
 473                                 (*f)->buf.bytesused = 0;
 474                                 do_gettimeofday(&(*f)->buf.timestamp);
 475                                 pos += 22;
 476                                 DBG(3, "SOF detected: new video frame");
 477                         }
 478
 479                 if ((*f)->state == F_GRABBING) {
 480                         if (sof && (*f)->buf.bytesused) {
 481                                 if (cam->sensor.pix_format.pixelformat ==
 482                                                          V4L2_PIX_FMT_ET61X251)
 483                                         goto end_of_frame;
 484                                 else {
 485                                         DBG(3, "Not expected SOF detected "
 486                                                "after %lu bytes",
 487                                            (unsigned long)(*f)->buf.bytesused);
 488                                         (*f)->state = F_ERROR;
 489                                         continue;
 490                                 }
 491                         }
 492
 493                         if ((*f)->buf.bytesused + imglen > imagesize) {
 494                                 DBG(3, "Video frame size exceeded");
 495                                 (*f)->state = F_ERROR;
 496                                 continue;
 497                         }
 498
 499                         pos += VOID_BYTES;
 500
 501                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
 502                         (*f)->buf.bytesused += imglen;
 503
 504                         if ((*f)->buf.bytesused == imagesize) {
 505                                 u32 b;
 506 end_of_frame:
 507                                 b = (*f)->buf.bytesused;
 508                                 (*f)->state = F_DONE;
 509                                 (*f)->buf.sequence= ++cam->frame_count;
 510                                 spin_lock(&cam->queue_lock);
 511                                 list_move_tail(&(*f)->frame, &cam->outqueue);
 512                                 if (!list_empty(&cam->inqueue))
 513                                         (*f) = list_entry(cam->inqueue.next,
 514                                                        struct et61x251_frame_t,
 515                                                           frame);
 516                                 else
 517                                         (*f) = NULL;
 518                                 spin_unlock(&cam->queue_lock);
 519                                 DBG(3, "Video frame captured: : %lu bytes",
 520                                        (unsigned long)(b));
 521
 522                                 if (!(*f))
 523                                         goto resubmit_urb;
 524
 525                                 if (sof &&
 526                                     cam->sensor.pix_format.pixelformat ==
 527                                                          V4L2_PIX_FMT_ET61X251)
 528                                         goto start_of_frame;
 529                         }
 530                 }
 531         }
 532
 533 resubmit_urb:
 534         urb->dev = cam->usbdev;
 535         err = usb_submit_urb(urb, GFP_ATOMIC);
 536         if (err < 0 && err != -EPERM) {
 537                 cam->state |= DEV_MISCONFIGURED;
 538                 DBG(1, "usb_submit_urb() failed");
 539         }
 540
 541         wake_up_interruptible(&cam->wait_frame);
 542 }
 543
 544
 545 static int et61x251_start_transfer(struct et61x251_device* cam)
 546 {
 547         struct usb_device *udev = cam->usbdev;
 548         struct urb* urb;
 549         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 550                                                    usb_ifnum_to_if(udev, 0),
 551                                                    ET61X251_ALTERNATE_SETTING);
 552         const unsigned int psz = le16_to_cpu(altsetting->
 553                                              endpoint[0].desc.wMaxPacketSize);
 554         s8 i, j;
 555         int err = 0;
 556
 557         for (i = 0; i < ET61X251_URBS; i++) {
 558                 cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
 559                                                   GFP_KERNEL);
 560                 if (!cam->transfer_buffer[i]) {
 561                         err = -ENOMEM;
 562                         DBG(1, "Not enough memory");
 563                         goto free_buffers;
 564                 }
 565         }
 566
 567         for (i = 0; i < ET61X251_URBS; i++) {
 568                 urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
 569                 cam->urb[i] = urb;
 570                 if (!urb) {
 571                         err = -ENOMEM;
 572                         DBG(1, "usb_alloc_urb() failed");
 573                         goto free_urbs;
 574                 }
 575                 urb->dev = udev;
 576                 urb->context = cam;
 577                 urb->pipe = usb_rcvisocpipe(udev, 1);
 578                 urb->transfer_flags = URB_ISO_ASAP;
 579                 urb->number_of_packets = ET61X251_ISO_PACKETS;
 580                 urb->complete = et61x251_urb_complete;
 581                 urb->transfer_buffer = cam->transfer_buffer[i];
 582                 urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
 583                 urb->interval = 1;
 584                 for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
 585                         urb->iso_frame_desc[j].offset = psz * j;
 586                         urb->iso_frame_desc[j].length = psz;
 587                 }
 588         }
 589
 590         err = et61x251_write_reg(cam, 0x01, 0x03);
 591         err = et61x251_write_reg(cam, 0x00, 0x03);
 592         err = et61x251_write_reg(cam, 0x08, 0x03);
 593         if (err) {
 594                 err = -EIO;
 595                 DBG(1, "I/O hardware error");
 596                 goto free_urbs;
 597         }
 598
 599         err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
 600         if (err) {
 601                 DBG(1, "usb_set_interface() failed");
 602                 goto free_urbs;
 603         }
 604
 605         cam->frame_current = NULL;
 606
 607         for (i = 0; i < ET61X251_URBS; i++) {
 608                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 609                 if (err) {
 610                         for (j = i-1; j >= 0; j--)
 611                                 usb_kill_urb(cam->urb[j]);
 612                         DBG(1, "usb_submit_urb() failed, error %d", err);
 613                         goto free_urbs;
 614                 }
 615         }
 616
 617         return 0;
 618
 619 free_urbs:
 620         for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
 621                 usb_free_urb(cam->urb[i]);
 622
 623 free_buffers:
 624         for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
 625                 kfree(cam->transfer_buffer[i]);
 626
 627         return err;
 628 }
 629
 630
 631 static int et61x251_stop_transfer(struct et61x251_device* cam)
 632 {
 633         struct usb_device *udev = cam->usbdev;
 634         s8 i;
 635         int err = 0;
 636
 637         if (cam->state & DEV_DISCONNECTED)
 638                 return 0;
 639
 640         for (i = ET61X251_URBS-1; i >= 0; i--) {
 641                 usb_kill_urb(cam->urb[i]);
 642                 usb_free_urb(cam->urb[i]);
 643                 kfree(cam->transfer_buffer[i]);
 644         }
 645
 646         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 647         if (err)
 648                 DBG(3, "usb_set_interface() failed");
 649
 650         return err;
 651 }
 652
 653
 654 static int et61x251_stream_interrupt(struct et61x251_device* cam)
 655 {
 656         long timeout;
 657
 658         cam->stream = STREAM_INTERRUPT;
 659         timeout = wait_event_timeout(cam->wait_stream,
 660                                      (cam->stream == STREAM_OFF) ||
 661                                      (cam->state & DEV_DISCONNECTED),
 662                                      ET61X251_URB_TIMEOUT);
 663         if (cam->state & DEV_DISCONNECTED)
 664                 return -ENODEV;
 665         else if (cam->stream != STREAM_OFF) {
 666                 cam->state |= DEV_MISCONFIGURED;
 667                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
 668                        "use it, close and open /dev/video%d again.",
 669                     cam->v4ldev->minor);
 670                 return -EIO;
 671         }
 672
 673         return 0;
 674 }
 675
 676 /*****************************************************************************/
 677
 678 #ifdef CONFIG_VIDEO_ADV_DEBUG
 679 static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
 680 {
 681         char str[5];
 682         char* endp;
 683         unsigned long val;
 684
 685         if (len < 4) {
 686                 strncpy(str, buff, len);
 687                 str[len] = '\0';
 688         } else {
 689                 strncpy(str, buff, 4);
 690                 str[4] = '\0';
 691         }
 692
 693         val = simple_strtoul(str, &endp, 0);
 694
 695         *count = 0;
 696         if (val <= 0xff)
 697                 *count = (ssize_t)(endp - str);
 698         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 699                 *count += 1;
 700
 701         return (u8)val;
 702 }
 703
 704 /*
 705    NOTE 1: being inside one of the following methods implies that the v4l
 706            device exists for sure (see kobjects and reference counters)
 707    NOTE 2: buffers are PAGE_SIZE long
 708 */
 709
 710 static ssize_t et61x251_show_reg(struct class_device* cd, char* buf)
 711 {
 712         struct et61x251_device* cam;
 713         ssize_t count;
 714
 715         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 716                 return -ERESTARTSYS;
 717
 718         cam = video_get_drvdata(to_video_device(cd));
 719         if (!cam) {
 720                 mutex_unlock(&et61x251_sysfs_lock);
 721                 return -ENODEV;
 722         }
 723
 724         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 725
 726         mutex_unlock(&et61x251_sysfs_lock);
 727
 728         return count;
 729 }
 730
 731
 732 static ssize_t
 733 et61x251_store_reg(struct class_device* cd, const char* buf, size_t len)
 734 {
 735         struct et61x251_device* cam;
 736         u8 index;
 737         ssize_t count;
 738
 739         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 740                 return -ERESTARTSYS;
 741
 742         cam = video_get_drvdata(to_video_device(cd));
 743         if (!cam) {
 744                 mutex_unlock(&et61x251_sysfs_lock);
 745                 return -ENODEV;
 746         }
 747
 748         index = et61x251_strtou8(buf, len, &count);
 749         if (index > 0x8e || !count) {
 750                 mutex_unlock(&et61x251_sysfs_lock);
 751                 return -EINVAL;
 752         }
 753
 754         cam->sysfs.reg = index;
 755
 756         DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
 757         DBG(3, "Written bytes: %zd", count);
 758
 759         mutex_unlock(&et61x251_sysfs_lock);
 760
 761         return count;
 762 }
 763
 764
 765 static ssize_t et61x251_show_val(struct class_device* cd, char* buf)
 766 {
 767         struct et61x251_device* cam;
 768         ssize_t count;
 769         int val;
 770
 771         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 772                 return -ERESTARTSYS;
 773
 774         cam = video_get_drvdata(to_video_device(cd));
 775         if (!cam) {
 776                 mutex_unlock(&et61x251_sysfs_lock);
 777                 return -ENODEV;
 778         }
 779
 780         if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
 781                 mutex_unlock(&et61x251_sysfs_lock);
 782                 return -EIO;
 783         }
 784
 785         count = sprintf(buf, "%d\n", val);
 786
 787         DBG(3, "Read bytes: %zd", count);
 788
 789         mutex_unlock(&et61x251_sysfs_lock);
 790
 791         return count;
 792 }
 793
 794
 795 static ssize_t
 796 et61x251_store_val(struct class_device* cd, const char* buf, size_t len)
 797 {
 798         struct et61x251_device* cam;
 799         u8 value;
 800         ssize_t count;
 801         int err;
 802
 803         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 804                 return -ERESTARTSYS;
 805
 806         cam = video_get_drvdata(to_video_device(cd));
 807         if (!cam) {
 808                 mutex_unlock(&et61x251_sysfs_lock);
 809                 return -ENODEV;
 810         }
 811
 812         value = et61x251_strtou8(buf, len, &count);
 813         if (!count) {
 814                 mutex_unlock(&et61x251_sysfs_lock);
 815                 return -EINVAL;
 816         }
 817
 818         err = et61x251_write_reg(cam, value, cam->sysfs.reg);
 819         if (err) {
 820                 mutex_unlock(&et61x251_sysfs_lock);
 821                 return -EIO;
 822         }
 823
 824         DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
 825             cam->sysfs.reg, value);
 826         DBG(3, "Written bytes: %zd", count);
 827
 828         mutex_unlock(&et61x251_sysfs_lock);
 829
 830         return count;
 831 }
 832
 833
 834 static ssize_t et61x251_show_i2c_reg(struct class_device* cd, char* buf)
 835 {
 836         struct et61x251_device* cam;
 837         ssize_t count;
 838
 839         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 840                 return -ERESTARTSYS;
 841
 842         cam = video_get_drvdata(to_video_device(cd));
 843         if (!cam) {
 844                 mutex_unlock(&et61x251_sysfs_lock);
 845                 return -ENODEV;
 846         }
 847
 848         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
 849
 850         DBG(3, "Read bytes: %zd", count);
 851
 852         mutex_unlock(&et61x251_sysfs_lock);
 853
 854         return count;
 855 }
 856
 857
 858 static ssize_t
 859 et61x251_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
 860 {
 861         struct et61x251_device* cam;
 862         u8 index;
 863         ssize_t count;
 864
 865         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 866                 return -ERESTARTSYS;
 867
 868         cam = video_get_drvdata(to_video_device(cd));
 869         if (!cam) {
 870                 mutex_unlock(&et61x251_sysfs_lock);
 871                 return -ENODEV;
 872         }
 873
 874         index = et61x251_strtou8(buf, len, &count);
 875         if (!count) {
 876                 mutex_unlock(&et61x251_sysfs_lock);
 877                 return -EINVAL;
 878         }
 879
 880         cam->sysfs.i2c_reg = index;
 881
 882         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
 883         DBG(3, "Written bytes: %zd", count);
 884
 885         mutex_unlock(&et61x251_sysfs_lock);
 886
 887         return count;
 888 }
 889
 890
 891 static ssize_t et61x251_show_i2c_val(struct class_device* cd, char* buf)
 892 {
 893         struct et61x251_device* cam;
 894         ssize_t count;
 895         int val;
 896
 897         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 898                 return -ERESTARTSYS;
 899
 900         cam = video_get_drvdata(to_video_device(cd));
 901         if (!cam) {
 902                 mutex_unlock(&et61x251_sysfs_lock);
 903                 return -ENODEV;
 904         }
 905
 906         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 907                 mutex_unlock(&et61x251_sysfs_lock);
 908                 return -ENOSYS;
 909         }
 910
 911         if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
 912                 mutex_unlock(&et61x251_sysfs_lock);
 913                 return -EIO;
 914         }
 915
 916         count = sprintf(buf, "%d\n", val);
 917
 918         DBG(3, "Read bytes: %zd", count);
 919
 920         mutex_unlock(&et61x251_sysfs_lock);
 921
 922         return count;
 923 }
 924
 925
 926 static ssize_t
 927 et61x251_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
 928 {
 929         struct et61x251_device* cam;
 930         u8 value;
 931         ssize_t count;
 932         int err;
 933
 934         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 935                 return -ERESTARTSYS;
 936
 937         cam = video_get_drvdata(to_video_device(cd));
 938         if (!cam) {
 939                 mutex_unlock(&et61x251_sysfs_lock);
 940                 return -ENODEV;
 941         }
 942
 943         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 944                 mutex_unlock(&et61x251_sysfs_lock);
 945                 return -ENOSYS;
 946         }
 947
 948         value = et61x251_strtou8(buf, len, &count);
 949         if (!count) {
 950                 mutex_unlock(&et61x251_sysfs_lock);
 951                 return -EINVAL;
 952         }
 953
 954         err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
 955         if (err) {
 956                 mutex_unlock(&et61x251_sysfs_lock);
 957                 return -EIO;
 958         }
 959
 960         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
 961             cam->sysfs.i2c_reg, value);
 962         DBG(3, "Written bytes: %zd", count);
 963
 964         mutex_unlock(&et61x251_sysfs_lock);
 965
 966         return count;
 967 }
 968
 969
 970 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
 971                          et61x251_show_reg, et61x251_store_reg);
 972 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
 973                          et61x251_show_val, et61x251_store_val);
 974 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
 975                          et61x251_show_i2c_reg, et61x251_store_i2c_reg);
 976 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
 977                          et61x251_show_i2c_val, et61x251_store_i2c_val);
 978
 979
 980 static int et61x251_create_sysfs(struct et61x251_device* cam)
 981 {
 982         struct class_device *classdev = &(cam->v4ldev->class_dev);
 983         int err = 0;
 984
 985         if ((err = class_device_create_file(classdev, &class_device_attr_reg)))
 986                 goto err_out;
 987         if ((err = class_device_create_file(classdev, &class_device_attr_val)))
 988                 goto err_reg;
 989
 990         if (cam->sensor.sysfs_ops) {
 991                 if ((err = class_device_create_file(classdev,
 992                                                   &class_device_attr_i2c_reg)))
 993                         goto err_val;
 994                 if ((err = class_device_create_file(classdev,
 995                                                   &class_device_attr_i2c_val)))
 996                         goto err_i2c_reg;
 997         }
 998
 999 err_i2c_reg:
1000         if (cam->sensor.sysfs_ops)
1001                 class_device_remove_file(classdev, &class_device_attr_i2c_reg);
1002 err_val:
1003         class_device_remove_file(classdev, &class_device_attr_val);
1004 err_reg:
1005         class_device_remove_file(classdev, &class_device_attr_reg);
1006 err_out:
1007         return err;
1008 }
1009 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1010
1011 /*****************************************************************************/
1012
1013 static int
1014 et61x251_set_pix_format(struct et61x251_device* cam,
1015                         struct v4l2_pix_format* pix)
1016 {
1017         int r, err = 0;
1018
1019         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1020                 err += r;
1021         if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1022                 err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1023         else
1024                 err += et61x251_write_reg(cam, r | 0x02, 0x12);
1025
1026         return err ? -EIO : 0;
1027 }
1028
1029
1030 static int
1031 et61x251_set_compression(struct et61x251_device* cam,
1032                          struct v4l2_jpegcompression* compression)
1033 {
1034         int r, err = 0;
1035
1036         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1037                 err += r;
1038         if (compression->quality == 0)
1039                 err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1040         else
1041                 err += et61x251_write_reg(cam, r | 0x04, 0x12);
1042
1043         return err ? -EIO : 0;
1044 }
1045
1046
1047 static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1048 {
1049         int r = 0, err = 0;
1050
1051         r = et61x251_read_reg(cam, 0x12);
1052         if (r < 0)
1053                 err += r;
1054
1055         if (scale == 1)
1056                 err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1057         else if (scale == 2)
1058                 err += et61x251_write_reg(cam, r | 0x01, 0x12);
1059
1060         if (err)
1061                 return -EIO;
1062
1063         PDBGG("Scaling factor: %u", scale);
1064
1065         return 0;
1066 }
1067
1068
1069 static int
1070 et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1071 {
1072         struct et61x251_sensor* s = &cam->sensor;
1073         u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1074                            s->active_pixel.left),
1075             fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1076                            s->active_pixel.top),
1077             fmw_length = (u16)(rect->width),
1078             fmw_height = (u16)(rect->height);
1079         int err = 0;
1080
1081         err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1082         err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1083         err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1084         err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1085         err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1086                                        | ((fmw_length & 0x300) >> 4)
1087                                        | ((fmw_height & 0x300) >> 2), 0x6d);
1088         if (err)
1089                 return -EIO;
1090
1091         PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1092               fmw_sx, fmw_sy, fmw_length, fmw_height);
1093
1094         return 0;
1095 }
1096
1097
1098 static int et61x251_init(struct et61x251_device* cam)
1099 {
1100         struct et61x251_sensor* s = &cam->sensor;
1101         struct v4l2_control ctrl;
1102         struct v4l2_queryctrl *qctrl;
1103         struct v4l2_rect* rect;
1104         u8 i = 0;
1105         int err = 0;
1106
1107         if (!(cam->state & DEV_INITIALIZED)) {
1108                 mutex_init(&cam->open_mutex);
1109                 init_waitqueue_head(&cam->wait_open);
1110                 qctrl = s->qctrl;
1111                 rect = &(s->cropcap.defrect);
1112                 cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1113         } else { /* use current values */
1114                 qctrl = s->_qctrl;
1115                 rect = &(s->_rect);
1116         }
1117
1118         err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1119         err += et61x251_set_crop(cam, rect);
1120         if (err)
1121                 return err;
1122
1123         if (s->init) {
1124                 err = s->init(cam);
1125                 if (err) {
1126                         DBG(3, "Sensor initialization failed");
1127                         return err;
1128                 }
1129         }
1130
1131         err += et61x251_set_compression(cam, &cam->compression);
1132         err += et61x251_set_pix_format(cam, &s->pix_format);
1133         if (s->set_pix_format)
1134                 err += s->set_pix_format(cam, &s->pix_format);
1135         if (err)
1136                 return err;
1137
1138         if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1139                 DBG(3, "Compressed video format is active, quality %d",
1140                     cam->compression.quality);
1141         else
1142                 DBG(3, "Uncompressed video format is active");
1143
1144         if (s->set_crop)
1145                 if ((err = s->set_crop(cam, rect))) {
1146                         DBG(3, "set_crop() failed");
1147                         return err;
1148                 }
1149
1150         if (s->set_ctrl) {
1151                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1152                         if (s->qctrl[i].id != 0 &&
1153                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1154                                 ctrl.id = s->qctrl[i].id;
1155                                 ctrl.value = qctrl[i].default_value;
1156                                 err = s->set_ctrl(cam, &ctrl);
1157                                 if (err) {
1158                                         DBG(3, "Set %s control failed",
1159                                             s->qctrl[i].name);
1160                                         return err;
1161                                 }
1162                                 DBG(3, "Image sensor supports '%s' control",
1163                                     s->qctrl[i].name);
1164                         }
1165         }
1166
1167         if (!(cam->state & DEV_INITIALIZED)) {
1168                 mutex_init(&cam->fileop_mutex);
1169                 spin_lock_init(&cam->queue_lock);
1170                 init_waitqueue_head(&cam->wait_frame);
1171                 init_waitqueue_head(&cam->wait_stream);
1172                 cam->nreadbuffers = 2;
1173                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1174                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1175                        sizeof(struct v4l2_rect));
1176                 cam->state |= DEV_INITIALIZED;
1177         }
1178
1179         DBG(2, "Initialization succeeded");
1180         return 0;
1181 }
1182
1183 /*****************************************************************************/
1184
1185 static void et61x251_release_resources(struct kref *kref)
1186 {
1187         struct et61x251_device *cam;
1188
1189         mutex_lock(&et61x251_sysfs_lock);
1190
1191         cam = container_of(kref, struct et61x251_device, kref);
1192
1193         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1194         video_set_drvdata(cam->v4ldev, NULL);
1195         video_unregister_device(cam->v4ldev);
1196         usb_put_dev(cam->usbdev);
1197         kfree(cam->control_buffer);
1198         kfree(cam);
1199
1200         mutex_unlock(&et61x251_sysfs_lock);
1201 }
1202
1203
1204 static int et61x251_open(struct inode* inode, struct file* filp)
1205 {
1206         struct et61x251_device* cam;
1207         int err = 0;
1208
1209         if (!down_read_trylock(&et61x251_dev_lock))
1210                 return -ERESTARTSYS;
1211
1212         cam = video_get_drvdata(video_devdata(filp));
1213
1214         if (wait_for_completion_interruptible(&cam->probe)) {
1215                 up_read(&et61x251_dev_lock);
1216                 return -ERESTARTSYS;
1217         }
1218
1219         kref_get(&cam->kref);
1220
1221         if (mutex_lock_interruptible(&cam->open_mutex)) {
1222                 kref_put(&cam->kref, et61x251_release_resources);
1223                 up_read(&et61x251_dev_lock);
1224                 return -ERESTARTSYS;
1225         }
1226
1227         if (cam->state & DEV_DISCONNECTED) {
1228                 DBG(1, "Device not present");
1229                 err = -ENODEV;
1230                 goto out;
1231         }
1232
1233         if (cam->users) {
1234                 DBG(2, "Device /dev/video%d is already in use",
1235                        cam->v4ldev->minor);
1236                 DBG(3, "Simultaneous opens are not supported");
1237                 if ((filp->f_flags & O_NONBLOCK) ||
1238                     (filp->f_flags & O_NDELAY)) {
1239                         err = -EWOULDBLOCK;
1240                         goto out;
1241                 }
1242                 DBG(2, "A blocking open() has been requested. Wait for the "
1243                        "device to be released...");
1244                 up_read(&et61x251_dev_lock);
1245                 err = wait_event_interruptible_exclusive(cam->wait_open,
1246                                                 (cam->state & DEV_DISCONNECTED)
1247                                                          || !cam->users);
1248                 down_read(&et61x251_dev_lock);
1249                 if (err)
1250                         goto out;
1251                 if (cam->state & DEV_DISCONNECTED) {
1252                         err = -ENODEV;
1253                         goto out;
1254                 }
1255         }
1256
1257         if (cam->state & DEV_MISCONFIGURED) {
1258                 err = et61x251_init(cam);
1259                 if (err) {
1260                         DBG(1, "Initialization failed again. "
1261                                "I will retry on next open().");
1262                         goto out;
1263                 }
1264                 cam->state &= ~DEV_MISCONFIGURED;
1265         }
1266
1267         if ((err = et61x251_start_transfer(cam)))
1268                 goto out;
1269
1270         filp->private_data = cam;
1271         cam->users++;
1272         cam->io = IO_NONE;
1273         cam->stream = STREAM_OFF;
1274         cam->nbuffers = 0;
1275         cam->frame_count = 0;
1276         et61x251_empty_framequeues(cam);
1277
1278         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1279
1280 out:
1281         mutex_unlock(&cam->open_mutex);
1282         if (err)
1283                 kref_put(&cam->kref, et61x251_release_resources);
1284         up_read(&et61x251_dev_lock);
1285         return err;
1286 }
1287
1288
1289 static int et61x251_release(struct inode* inode, struct file* filp)
1290 {
1291         struct et61x251_device* cam;
1292
1293         down_write(&et61x251_dev_lock);
1294
1295         cam = video_get_drvdata(video_devdata(filp));
1296
1297         et61x251_stop_transfer(cam);
1298         et61x251_release_buffers(cam);
1299         cam->users--;
1300         wake_up_interruptible_nr(&cam->wait_open, 1);
1301
1302         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1303
1304         kref_put(&cam->kref, et61x251_release_resources);
1305
1306         up_write(&et61x251_dev_lock);
1307
1308         return 0;
1309 }
1310
1311
1312 static ssize_t
1313 et61x251_read(struct file* filp, char __user * buf,
1314               size_t count, loff_t* f_pos)
1315 {
1316         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1317         struct et61x251_frame_t* f, * i;
1318         unsigned long lock_flags;
1319         long timeout;
1320         int err = 0;
1321
1322         if (mutex_lock_interruptible(&cam->fileop_mutex))
1323                 return -ERESTARTSYS;
1324
1325         if (cam->state & DEV_DISCONNECTED) {
1326                 DBG(1, "Device not present");
1327                 mutex_unlock(&cam->fileop_mutex);
1328                 return -ENODEV;
1329         }
1330
1331         if (cam->state & DEV_MISCONFIGURED) {
1332                 DBG(1, "The camera is misconfigured. Close and open it "
1333                        "again.");
1334                 mutex_unlock(&cam->fileop_mutex);
1335                 return -EIO;
1336         }
1337
1338         if (cam->io == IO_MMAP) {
1339                 DBG(3, "Close and open the device again to choose the read "
1340                        "method");
1341                 mutex_unlock(&cam->fileop_mutex);
1342                 return -EBUSY;
1343         }
1344
1345         if (cam->io == IO_NONE) {
1346                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1347                                               IO_READ)) {
1348                         DBG(1, "read() failed, not enough memory");
1349                         mutex_unlock(&cam->fileop_mutex);
1350                         return -ENOMEM;
1351                 }
1352                 cam->io = IO_READ;
1353                 cam->stream = STREAM_ON;
1354         }
1355
1356         if (list_empty(&cam->inqueue)) {
1357                 if (!list_empty(&cam->outqueue))
1358                         et61x251_empty_framequeues(cam);
1359                 et61x251_queue_unusedframes(cam);
1360         }
1361
1362         if (!count) {
1363                 mutex_unlock(&cam->fileop_mutex);
1364                 return 0;
1365         }
1366
1367         if (list_empty(&cam->outqueue)) {
1368                 if (filp->f_flags & O_NONBLOCK) {
1369                         mutex_unlock(&cam->fileop_mutex);
1370                         return -EAGAIN;
1371                 }
1372                 timeout = wait_event_interruptible_timeout
1373                           ( cam->wait_frame,
1374                             (!list_empty(&cam->outqueue)) ||
1375                             (cam->state & DEV_DISCONNECTED) ||
1376                             (cam->state & DEV_MISCONFIGURED),
1377                             cam->module_param.frame_timeout *
1378                             1000 * msecs_to_jiffies(1) );
1379                 if (timeout < 0) {
1380                         mutex_unlock(&cam->fileop_mutex);
1381                         return timeout;
1382                 }
1383                 if (cam->state & DEV_DISCONNECTED) {
1384                         mutex_unlock(&cam->fileop_mutex);
1385                         return -ENODEV;
1386                 }
1387                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1388                         mutex_unlock(&cam->fileop_mutex);
1389                         return -EIO;
1390                 }
1391         }
1392
1393         f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1394
1395         if (count > f->buf.bytesused)
1396                 count = f->buf.bytesused;
1397
1398         if (copy_to_user(buf, f->bufmem, count)) {
1399                 err = -EFAULT;
1400                 goto exit;
1401         }
1402         *f_pos += count;
1403
1404 exit:
1405         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1406         list_for_each_entry(i, &cam->outqueue, frame)
1407                 i->state = F_UNUSED;
1408         INIT_LIST_HEAD(&cam->outqueue);
1409         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1410
1411         et61x251_queue_unusedframes(cam);
1412
1413         PDBGG("Frame #%lu, bytes read: %zu",
1414               (unsigned long)f->buf.index, count);
1415
1416         mutex_unlock(&cam->fileop_mutex);
1417
1418         return err ? err : count;
1419 }
1420
1421
1422 static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1423 {
1424         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1425         struct et61x251_frame_t* f;
1426         unsigned long lock_flags;
1427         unsigned int mask = 0;
1428
1429         if (mutex_lock_interruptible(&cam->fileop_mutex))
1430                 return POLLERR;
1431
1432         if (cam->state & DEV_DISCONNECTED) {
1433                 DBG(1, "Device not present");
1434                 goto error;
1435         }
1436
1437         if (cam->state & DEV_MISCONFIGURED) {
1438                 DBG(1, "The camera is misconfigured. Close and open it "
1439                        "again.");
1440                 goto error;
1441         }
1442
1443         if (cam->io == IO_NONE) {
1444                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1445                                               IO_READ)) {
1446                         DBG(1, "poll() failed, not enough memory");
1447                         goto error;
1448                 }
1449                 cam->io = IO_READ;
1450                 cam->stream = STREAM_ON;
1451         }
1452
1453         if (cam->io == IO_READ) {
1454                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1455                 list_for_each_entry(f, &cam->outqueue, frame)
1456                         f->state = F_UNUSED;
1457                 INIT_LIST_HEAD(&cam->outqueue);
1458                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1459                 et61x251_queue_unusedframes(cam);
1460         }
1461
1462         poll_wait(filp, &cam->wait_frame, wait);
1463
1464         if (!list_empty(&cam->outqueue))
1465                 mask |= POLLIN | POLLRDNORM;
1466
1467         mutex_unlock(&cam->fileop_mutex);
1468
1469         return mask;
1470
1471 error:
1472         mutex_unlock(&cam->fileop_mutex);
1473         return POLLERR;
1474 }
1475
1476
1477 static void et61x251_vm_open(struct vm_area_struct* vma)
1478 {
1479         struct et61x251_frame_t* f = vma->vm_private_data;
1480         f->vma_use_count++;
1481 }
1482
1483
1484 static void et61x251_vm_close(struct vm_area_struct* vma)
1485 {
1486         /* NOTE: buffers are not freed here */
1487         struct et61x251_frame_t* f = vma->vm_private_data;
1488         f->vma_use_count--;
1489 }
1490
1491
1492 static struct vm_operations_struct et61x251_vm_ops = {
1493         .open = et61x251_vm_open,
1494         .close = et61x251_vm_close,
1495 };
1496
1497
1498 static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1499 {
1500         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1501         unsigned long size = vma->vm_end - vma->vm_start,
1502                       start = vma->vm_start;
1503         void *pos;
1504         u32 i;
1505
1506         if (mutex_lock_interruptible(&cam->fileop_mutex))
1507                 return -ERESTARTSYS;
1508
1509         if (cam->state & DEV_DISCONNECTED) {
1510                 DBG(1, "Device not present");
1511                 mutex_unlock(&cam->fileop_mutex);
1512                 return -ENODEV;
1513         }
1514
1515         if (cam->state & DEV_MISCONFIGURED) {
1516                 DBG(1, "The camera is misconfigured. Close and open it "
1517                        "again.");
1518                 mutex_unlock(&cam->fileop_mutex);
1519                 return -EIO;
1520         }
1521
1522         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
1523                 mutex_unlock(&cam->fileop_mutex);
1524                 return -EACCES;
1525         }
1526
1527         if (cam->io != IO_MMAP ||
1528             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1529                 mutex_unlock(&cam->fileop_mutex);
1530                 return -EINVAL;
1531         }
1532
1533         for (i = 0; i < cam->nbuffers; i++) {
1534                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1535                         break;
1536         }
1537         if (i == cam->nbuffers) {
1538                 mutex_unlock(&cam->fileop_mutex);
1539                 return -EINVAL;
1540         }
1541
1542         vma->vm_flags |= VM_IO;
1543         vma->vm_flags |= VM_RESERVED;
1544
1545         pos = cam->frame[i].bufmem;
1546         while (size > 0) { /* size is page-aligned */
1547                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1548                         mutex_unlock(&cam->fileop_mutex);
1549                         return -EAGAIN;
1550                 }
1551                 start += PAGE_SIZE;
1552                 pos += PAGE_SIZE;
1553                 size -= PAGE_SIZE;
1554         }
1555
1556         vma->vm_ops = &et61x251_vm_ops;
1557         vma->vm_private_data = &cam->frame[i];
1558         et61x251_vm_open(vma);
1559
1560         mutex_unlock(&cam->fileop_mutex);
1561
1562         return 0;
1563 }
1564
1565 /*****************************************************************************/
1566
1567 static int
1568 et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1569 {
1570         struct v4l2_capability cap = {
1571                 .driver = "et61x251",
1572                 .version = ET61X251_MODULE_VERSION_CODE,
1573                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1574                                 V4L2_CAP_STREAMING,
1575         };
1576
1577         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1578         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1579                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1580                         sizeof(cap.bus_info));
1581
1582         if (copy_to_user(arg, &cap, sizeof(cap)))
1583                 return -EFAULT;
1584
1585         return 0;
1586 }
1587
1588
1589 static int
1590 et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1591 {
1592         struct v4l2_input i;
1593
1594         if (copy_from_user(&i, arg, sizeof(i)))
1595                 return -EFAULT;
1596
1597         if (i.index)
1598                 return -EINVAL;
1599
1600         memset(&i, 0, sizeof(i));
1601         strcpy(i.name, "Camera");
1602         i.type = V4L2_INPUT_TYPE_CAMERA;
1603
1604         if (copy_to_user(arg, &i, sizeof(i)))
1605                 return -EFAULT;
1606
1607         return 0;
1608 }
1609
1610
1611 static int
1612 et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1613 {
1614         int index = 0;
1615
1616         if (copy_to_user(arg, &index, sizeof(index)))
1617                 return -EFAULT;
1618
1619         return 0;
1620 }
1621
1622
1623 static int
1624 et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1625 {
1626         int index;
1627
1628         if (copy_from_user(&index, arg, sizeof(index)))
1629                 return -EFAULT;
1630
1631         if (index != 0)
1632                 return -EINVAL;
1633
1634         return 0;
1635 }
1636
1637
1638 static int
1639 et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1640 {
1641         struct et61x251_sensor* s = &cam->sensor;
1642         struct v4l2_queryctrl qc;
1643         u8 i;
1644
1645         if (copy_from_user(&qc, arg, sizeof(qc)))
1646                 return -EFAULT;
1647
1648         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1649                 if (qc.id && qc.id == s->qctrl[i].id) {
1650                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1651                         if (copy_to_user(arg, &qc, sizeof(qc)))
1652                                 return -EFAULT;
1653                         return 0;
1654                 }
1655
1656         return -EINVAL;
1657 }
1658
1659
1660 static int
1661 et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1662 {
1663         struct et61x251_sensor* s = &cam->sensor;
1664         struct v4l2_control ctrl;
1665         int err = 0;
1666         u8 i;
1667
1668         if (!s->get_ctrl && !s->set_ctrl)
1669                 return -EINVAL;
1670
1671         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1672                 return -EFAULT;
1673
1674         if (!s->get_ctrl) {
1675                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1676                         if (ctrl.id == s->qctrl[i].id) {
1677                                 ctrl.value = s->_qctrl[i].default_value;
1678                                 goto exit;
1679                         }
1680                 return -EINVAL;
1681         } else
1682                 err = s->get_ctrl(cam, &ctrl);
1683
1684 exit:
1685         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1686                 return -EFAULT;
1687
1688         return err;
1689 }
1690
1691
1692 static int
1693 et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1694 {
1695         struct et61x251_sensor* s = &cam->sensor;
1696         struct v4l2_control ctrl;
1697         u8 i;
1698         int err = 0;
1699
1700         if (!s->set_ctrl)
1701                 return -EINVAL;
1702
1703         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1704                 return -EFAULT;
1705
1706         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1707                 if (ctrl.id == s->qctrl[i].id) {
1708                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1709                                 return -EINVAL;
1710                         if (ctrl.value < s->qctrl[i].minimum ||
1711                             ctrl.value > s->qctrl[i].maximum)
1712                                 return -ERANGE;
1713                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1714                         break;
1715                 }
1716
1717         if ((err = s->set_ctrl(cam, &ctrl)))
1718                 return err;
1719
1720         s->_qctrl[i].default_value = ctrl.value;
1721
1722         return 0;
1723 }
1724
1725
1726 static int
1727 et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1728 {
1729         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1730
1731         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1732         cc->pixelaspect.numerator = 1;
1733         cc->pixelaspect.denominator = 1;
1734
1735         if (copy_to_user(arg, cc, sizeof(*cc)))
1736                 return -EFAULT;
1737
1738         return 0;
1739 }
1740
1741
1742 static int
1743 et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1744 {
1745         struct et61x251_sensor* s = &cam->sensor;
1746         struct v4l2_crop crop = {
1747                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1748         };
1749
1750         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1751
1752         if (copy_to_user(arg, &crop, sizeof(crop)))
1753                 return -EFAULT;
1754
1755         return 0;
1756 }
1757
1758
1759 static int
1760 et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1761 {
1762         struct et61x251_sensor* s = &cam->sensor;
1763         struct v4l2_crop crop;
1764         struct v4l2_rect* rect;
1765         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1766         struct v4l2_pix_format* pix_format = &(s->pix_format);
1767         u8 scale;
1768         const enum et61x251_stream_state stream = cam->stream;
1769         const u32 nbuffers = cam->nbuffers;
1770         u32 i;
1771         int err = 0;
1772
1773         if (copy_from_user(&crop, arg, sizeof(crop)))
1774                 return -EFAULT;
1775
1776         rect = &(crop.c);
1777
1778         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1779                 return -EINVAL;
1780
1781         if (cam->module_param.force_munmap)
1782                 for (i = 0; i < cam->nbuffers; i++)
1783                         if (cam->frame[i].vma_use_count) {
1784                                 DBG(3, "VIDIOC_S_CROP failed. "
1785                                        "Unmap the buffers first.");
1786                                 return -EBUSY;
1787                         }
1788
1789         /* Preserve R,G or B origin */
1790         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1791         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1792
1793         if (rect->width < 16)
1794                 rect->width = 16;
1795         if (rect->height < 16)
1796                 rect->height = 16;
1797         if (rect->width > bounds->width)
1798                 rect->width = bounds->width;
1799         if (rect->height > bounds->height)
1800                 rect->height = bounds->height;
1801         if (rect->left < bounds->left)
1802                 rect->left = bounds->left;
1803         if (rect->top < bounds->top)
1804                 rect->top = bounds->top;
1805         if (rect->left + rect->width > bounds->left + bounds->width)
1806                 rect->left = bounds->left+bounds->width - rect->width;
1807         if (rect->top + rect->height > bounds->top + bounds->height)
1808                 rect->top = bounds->top+bounds->height - rect->height;
1809
1810         rect->width &= ~15L;
1811         rect->height &= ~15L;
1812
1813         if (ET61X251_PRESERVE_IMGSCALE) {
1814                 /* Calculate the actual scaling factor */
1815                 u32 a, b;
1816                 a = rect->width * rect->height;
1817                 b = pix_format->width * pix_format->height;
1818                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1819         } else
1820                 scale = 1;
1821
1822         if (cam->stream == STREAM_ON)
1823                 if ((err = et61x251_stream_interrupt(cam)))
1824                         return err;
1825
1826         if (copy_to_user(arg, &crop, sizeof(crop))) {
1827                 cam->stream = stream;
1828                 return -EFAULT;
1829         }
1830
1831         if (cam->module_param.force_munmap || cam->io == IO_READ)
1832                 et61x251_release_buffers(cam);
1833
1834         err = et61x251_set_crop(cam, rect);
1835         if (s->set_crop)
1836                 err += s->set_crop(cam, rect);
1837         err += et61x251_set_scale(cam, scale);
1838
1839         if (err) { /* atomic, no rollback in ioctl() */
1840                 cam->state |= DEV_MISCONFIGURED;
1841                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1842                        "use the camera, close and open /dev/video%d again.",
1843                     cam->v4ldev->minor);
1844                 return -EIO;
1845         }
1846
1847         s->pix_format.width = rect->width/scale;
1848         s->pix_format.height = rect->height/scale;
1849         memcpy(&(s->_rect), rect, sizeof(*rect));
1850
1851         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1852             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1853                 cam->state |= DEV_MISCONFIGURED;
1854                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1855                        "use the camera, close and open /dev/video%d again.",
1856                     cam->v4ldev->minor);
1857                 return -ENOMEM;
1858         }
1859
1860         if (cam->io == IO_READ)
1861                 et61x251_empty_framequeues(cam);
1862         else if (cam->module_param.force_munmap)
1863                 et61x251_requeue_outqueue(cam);
1864
1865         cam->stream = stream;
1866
1867         return 0;
1868 }
1869
1870
1871 static int
1872 et61x251_vidioc_enum_framesizes(struct et61x251_device* cam, void __user * arg)
1873 {
1874         struct v4l2_frmsizeenum frmsize;
1875
1876         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1877                 return -EFAULT;
1878
1879         if (frmsize.index != 0)
1880                 return -EINVAL;
1881
1882         if (frmsize.pixel_format != V4L2_PIX_FMT_ET61X251 &&
1883             frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
1884                 return -EINVAL;
1885
1886         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
1887         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
1888         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
1889         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
1890         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
1891         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1892
1893         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1894                 return -EFAULT;
1895
1896         return 0;
1897 }
1898
1899
1900 static int
1901 et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1902 {
1903         struct v4l2_fmtdesc fmtd;
1904
1905         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1906                 return -EFAULT;
1907
1908         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1909                 return -EINVAL;
1910
1911         if (fmtd.index == 0) {
1912                 strcpy(fmtd.description, "bayer rgb");
1913                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1914         } else if (fmtd.index == 1) {
1915                 strcpy(fmtd.description, "compressed");
1916                 fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1917                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1918         } else
1919                 return -EINVAL;
1920
1921         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1922         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1923
1924         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1925                 return -EFAULT;
1926
1927         return 0;
1928 }
1929
1930
1931 static int
1932 et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1933 {
1934         struct v4l2_format format;
1935         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1936
1937         if (copy_from_user(&format, arg, sizeof(format)))
1938                 return -EFAULT;
1939
1940         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1941                 return -EINVAL;
1942
1943         pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_ET61X251) ?
1944                            0 : V4L2_COLORSPACE_SRGB;
1945         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1946                              ? 0 : (pfmt->width * pfmt->priv) / 8;
1947         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1948         pfmt->field = V4L2_FIELD_NONE;
1949         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1950
1951         if (copy_to_user(arg, &format, sizeof(format)))
1952                 return -EFAULT;
1953
1954         return 0;
1955 }
1956
1957
1958 static int
1959 et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1960                           void __user * arg)
1961 {
1962         struct et61x251_sensor* s = &cam->sensor;
1963         struct v4l2_format format;
1964         struct v4l2_pix_format* pix;
1965         struct v4l2_pix_format* pfmt = &(s->pix_format);
1966         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1967         struct v4l2_rect rect;
1968         u8 scale;
1969         const enum et61x251_stream_state stream = cam->stream;
1970         const u32 nbuffers = cam->nbuffers;
1971         u32 i;
1972         int err = 0;
1973
1974         if (copy_from_user(&format, arg, sizeof(format)))
1975                 return -EFAULT;
1976
1977         pix = &(format.fmt.pix);
1978
1979         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1980                 return -EINVAL;
1981
1982         memcpy(&rect, &(s->_rect), sizeof(rect));
1983
1984         { /* calculate the actual scaling factor */
1985                 u32 a, b;
1986                 a = rect.width * rect.height;
1987                 b = pix->width * pix->height;
1988                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1989         }
1990
1991         rect.width = scale * pix->width;
1992         rect.height = scale * pix->height;
1993
1994         if (rect.width < 16)
1995                 rect.width = 16;
1996         if (rect.height < 16)
1997                 rect.height = 16;
1998         if (rect.width > bounds->left + bounds->width - rect.left)
1999                 rect.width = bounds->left + bounds->width - rect.left;
2000         if (rect.height > bounds->top + bounds->height - rect.top)
2001                 rect.height = bounds->top + bounds->height - rect.top;
2002
2003         rect.width &= ~15L;
2004         rect.height &= ~15L;
2005
2006         { /* adjust the scaling factor */
2007                 u32 a, b;
2008                 a = rect.width * rect.height;
2009                 b = pix->width * pix->height;
2010                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
2011         }
2012
2013         pix->width = rect.width / scale;
2014         pix->height = rect.height / scale;
2015
2016         if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
2017             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2018                 pix->pixelformat = pfmt->pixelformat;
2019         pix->priv = pfmt->priv; /* bpp */
2020         pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_ET61X251) ?
2021                           0 : V4L2_COLORSPACE_SRGB;
2022         pix->colorspace = pfmt->colorspace;
2023         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
2024                             ? 0 : (pix->width * pix->priv) / 8;
2025         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2026         pix->field = V4L2_FIELD_NONE;
2027
2028         if (cmd == VIDIOC_TRY_FMT) {
2029                 if (copy_to_user(arg, &format, sizeof(format)))
2030                         return -EFAULT;
2031                 return 0;
2032         }
2033
2034         if (cam->module_param.force_munmap)
2035                 for (i = 0; i < cam->nbuffers; i++)
2036                         if (cam->frame[i].vma_use_count) {
2037                                 DBG(3, "VIDIOC_S_FMT failed. "
2038                                        "Unmap the buffers first.");
2039                                 return -EBUSY;
2040                         }
2041
2042         if (cam->stream == STREAM_ON)
2043                 if ((err = et61x251_stream_interrupt(cam)))
2044                         return err;
2045
2046         if (copy_to_user(arg, &format, sizeof(format))) {
2047                 cam->stream = stream;
2048                 return -EFAULT;
2049         }
2050
2051         if (cam->module_param.force_munmap || cam->io == IO_READ)
2052                 et61x251_release_buffers(cam);
2053
2054         err += et61x251_set_pix_format(cam, pix);
2055         err += et61x251_set_crop(cam, &rect);
2056         if (s->set_pix_format)
2057                 err += s->set_pix_format(cam, pix);
2058         if (s->set_crop)
2059                 err += s->set_crop(cam, &rect);
2060         err += et61x251_set_scale(cam, scale);
2061
2062         if (err) { /* atomic, no rollback in ioctl() */
2063                 cam->state |= DEV_MISCONFIGURED;
2064                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2065                        "use the camera, close and open /dev/video%d again.",
2066                     cam->v4ldev->minor);
2067                 return -EIO;
2068         }
2069
2070         memcpy(pfmt, pix, sizeof(*pix));
2071         memcpy(&(s->_rect), &rect, sizeof(rect));
2072
2073         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2074             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2075                 cam->state |= DEV_MISCONFIGURED;
2076                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2077                        "use the camera, close and open /dev/video%d again.",
2078                     cam->v4ldev->minor);
2079                 return -ENOMEM;
2080         }
2081
2082         if (cam->io == IO_READ)
2083                 et61x251_empty_framequeues(cam);
2084         else if (cam->module_param.force_munmap)
2085                 et61x251_requeue_outqueue(cam);
2086
2087         cam->stream = stream;
2088
2089         return 0;
2090 }
2091
2092
2093 static int
2094 et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2095 {
2096         if (copy_to_user(arg, &cam->compression,
2097                          sizeof(cam->compression)))
2098                 return -EFAULT;
2099
2100         return 0;
2101 }
2102
2103
2104 static int
2105 et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2106 {
2107         struct v4l2_jpegcompression jc;
2108         const enum et61x251_stream_state stream = cam->stream;
2109         int err = 0;
2110
2111         if (copy_from_user(&jc, arg, sizeof(jc)))
2112                 return -EFAULT;
2113
2114         if (jc.quality != 0 && jc.quality != 1)
2115                 return -EINVAL;
2116
2117         if (cam->stream == STREAM_ON)
2118                 if ((err = et61x251_stream_interrupt(cam)))
2119                         return err;
2120
2121         err += et61x251_set_compression(cam, &jc);
2122         if (err) { /* atomic, no rollback in ioctl() */
2123                 cam->state |= DEV_MISCONFIGURED;
2124                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2125                        "problems. To use the camera, close and open "
2126                        "/dev/video%d again.", cam->v4ldev->minor);
2127                 return -EIO;
2128         }
2129
2130         cam->compression.quality = jc.quality;
2131
2132         cam->stream = stream;
2133
2134         return 0;
2135 }
2136
2137
2138 static int
2139 et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2140 {
2141         struct v4l2_requestbuffers rb;
2142         u32 i;
2143         int err;
2144
2145         if (copy_from_user(&rb, arg, sizeof(rb)))
2146                 return -EFAULT;
2147
2148         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2149             rb.memory != V4L2_MEMORY_MMAP)
2150                 return -EINVAL;
2151
2152         if (cam->io == IO_READ) {
2153                 DBG(3, "Close and open the device again to choose the mmap "
2154                        "I/O method");
2155                 return -EBUSY;
2156         }
2157
2158         for (i = 0; i < cam->nbuffers; i++)
2159                 if (cam->frame[i].vma_use_count) {
2160                         DBG(3, "VIDIOC_REQBUFS failed. "
2161                                "Previous buffers are still mapped.");
2162                         return -EBUSY;
2163                 }
2164
2165         if (cam->stream == STREAM_ON)
2166                 if ((err = et61x251_stream_interrupt(cam)))
2167                         return err;
2168
2169         et61x251_empty_framequeues(cam);
2170
2171         et61x251_release_buffers(cam);
2172         if (rb.count)
2173                 rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2174
2175         if (copy_to_user(arg, &rb, sizeof(rb))) {
2176                 et61x251_release_buffers(cam);
2177                 cam->io = IO_NONE;
2178                 return -EFAULT;
2179         }
2180
2181         cam->io = rb.count ? IO_MMAP : IO_NONE;
2182
2183         return 0;
2184 }
2185
2186
2187 static int
2188 et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2189 {
2190         struct v4l2_buffer b;
2191
2192         if (copy_from_user(&b, arg, sizeof(b)))
2193                 return -EFAULT;
2194
2195         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2196             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2197                 return -EINVAL;
2198
2199         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2200
2201         if (cam->frame[b.index].vma_use_count)
2202                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2203
2204         if (cam->frame[b.index].state == F_DONE)
2205                 b.flags |= V4L2_BUF_FLAG_DONE;
2206         else if (cam->frame[b.index].state != F_UNUSED)
2207                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2208
2209         if (copy_to_user(arg, &b, sizeof(b)))
2210                 return -EFAULT;
2211
2212         return 0;
2213 }
2214
2215
2216 static int
2217 et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2218 {
2219         struct v4l2_buffer b;
2220         unsigned long lock_flags;
2221
2222         if (copy_from_user(&b, arg, sizeof(b)))
2223                 return -EFAULT;
2224
2225         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2226             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2227                 return -EINVAL;
2228
2229         if (cam->frame[b.index].state != F_UNUSED)
2230                 return -EINVAL;
2231
2232         cam->frame[b.index].state = F_QUEUED;
2233
2234         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2235         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2236         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2237
2238         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2239
2240         return 0;
2241 }
2242
2243
2244 static int
2245 et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2246                       void __user * arg)
2247 {
2248         struct v4l2_buffer b;
2249         struct et61x251_frame_t *f;
2250         unsigned long lock_flags;
2251         long timeout;
2252
2253         if (copy_from_user(&b, arg, sizeof(b)))
2254                 return -EFAULT;
2255
2256         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2257                 return -EINVAL;
2258
2259         if (list_empty(&cam->outqueue)) {
2260                 if (cam->stream == STREAM_OFF)
2261                         return -EINVAL;
2262                 if (filp->f_flags & O_NONBLOCK)
2263                         return -EAGAIN;
2264                 timeout = wait_event_interruptible_timeout
2265                           ( cam->wait_frame,
2266                             (!list_empty(&cam->outqueue)) ||
2267                             (cam->state & DEV_DISCONNECTED) ||
2268                             (cam->state & DEV_MISCONFIGURED),
2269                             cam->module_param.frame_timeout *
2270                             1000 * msecs_to_jiffies(1) );
2271                 if (timeout < 0)
2272                         return timeout;
2273                 if (cam->state & DEV_DISCONNECTED)
2274                         return -ENODEV;
2275                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2276                         return -EIO;
2277         }
2278
2279         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2280         f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2281         list_del(cam->outqueue.next);
2282         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2283
2284         f->state = F_UNUSED;
2285
2286         memcpy(&b, &f->buf, sizeof(b));
2287         if (f->vma_use_count)
2288                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2289
2290         if (copy_to_user(arg, &b, sizeof(b)))
2291                 return -EFAULT;
2292
2293         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2294
2295         return 0;
2296 }
2297
2298
2299 static int
2300 et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2301 {
2302         int type;
2303
2304         if (copy_from_user(&type, arg, sizeof(type)))
2305                 return -EFAULT;
2306
2307         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2308                 return -EINVAL;
2309
2310         cam->stream = STREAM_ON;
2311
2312         DBG(3, "Stream on");
2313
2314         return 0;
2315 }
2316
2317
2318 static int
2319 et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2320 {
2321         int type, err;
2322
2323         if (copy_from_user(&type, arg, sizeof(type)))
2324                 return -EFAULT;
2325
2326         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2327                 return -EINVAL;
2328
2329         if (cam->stream == STREAM_ON)
2330                 if ((err = et61x251_stream_interrupt(cam)))
2331                         return err;
2332
2333         et61x251_empty_framequeues(cam);
2334
2335         DBG(3, "Stream off");
2336
2337         return 0;
2338 }
2339
2340
2341 static int
2342 et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2343 {
2344         struct v4l2_streamparm sp;
2345
2346         if (copy_from_user(&sp, arg, sizeof(sp)))
2347                 return -EFAULT;
2348
2349         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2350                 return -EINVAL;
2351
2352         sp.parm.capture.extendedmode = 0;
2353         sp.parm.capture.readbuffers = cam->nreadbuffers;
2354
2355         if (copy_to_user(arg, &sp, sizeof(sp)))
2356                 return -EFAULT;
2357
2358         return 0;
2359 }
2360
2361
2362 static int
2363 et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2364 {
2365         struct v4l2_streamparm sp;
2366
2367         if (copy_from_user(&sp, arg, sizeof(sp)))
2368                 return -EFAULT;
2369
2370         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2371                 return -EINVAL;
2372
2373         sp.parm.capture.extendedmode = 0;
2374
2375         if (sp.parm.capture.readbuffers == 0)
2376                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2377
2378         if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2379                 sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2380
2381         if (copy_to_user(arg, &sp, sizeof(sp)))
2382                 return -EFAULT;
2383
2384         cam->nreadbuffers = sp.parm.capture.readbuffers;
2385
2386         return 0;
2387 }
2388
2389
2390 static int et61x251_ioctl_v4l2(struct inode* inode, struct file* filp,
2391                                unsigned int cmd, void __user * arg)
2392 {
2393         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2394
2395         switch (cmd) {
2396
2397         case VIDIOC_QUERYCAP:
2398                 return et61x251_vidioc_querycap(cam, arg);
2399
2400         case VIDIOC_ENUMINPUT:
2401                 return et61x251_vidioc_enuminput(cam, arg);
2402
2403         case VIDIOC_G_INPUT:
2404                 return et61x251_vidioc_g_input(cam, arg);
2405
2406         case VIDIOC_S_INPUT:
2407                 return et61x251_vidioc_s_input(cam, arg);
2408
2409         case VIDIOC_QUERYCTRL:
2410                 return et61x251_vidioc_query_ctrl(cam, arg);
2411
2412         case VIDIOC_G_CTRL:
2413                 return et61x251_vidioc_g_ctrl(cam, arg);
2414
2415         case VIDIOC_S_CTRL:
2416                 return et61x251_vidioc_s_ctrl(cam, arg);
2417
2418         case VIDIOC_CROPCAP:
2419                 return et61x251_vidioc_cropcap(cam, arg);
2420
2421         case VIDIOC_G_CROP:
2422                 return et61x251_vidioc_g_crop(cam, arg);
2423
2424         case VIDIOC_S_CROP:
2425                 return et61x251_vidioc_s_crop(cam, arg);
2426
2427         case VIDIOC_ENUM_FMT:
2428                 return et61x251_vidioc_enum_fmt(cam, arg);
2429
2430         case VIDIOC_G_FMT:
2431                 return et61x251_vidioc_g_fmt(cam, arg);
2432
2433         case VIDIOC_TRY_FMT:
2434         case VIDIOC_S_FMT:
2435                 return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2436
2437         case VIDIOC_ENUM_FRAMESIZES:
2438                 return et61x251_vidioc_enum_framesizes(cam, arg);
2439
2440         case VIDIOC_G_JPEGCOMP:
2441                 return et61x251_vidioc_g_jpegcomp(cam, arg);
2442
2443         case VIDIOC_S_JPEGCOMP:
2444                 return et61x251_vidioc_s_jpegcomp(cam, arg);
2445
2446         case VIDIOC_REQBUFS:
2447                 return et61x251_vidioc_reqbufs(cam, arg);
2448
2449         case VIDIOC_QUERYBUF:
2450                 return et61x251_vidioc_querybuf(cam, arg);
2451
2452         case VIDIOC_QBUF:
2453                 return et61x251_vidioc_qbuf(cam, arg);
2454
2455         case VIDIOC_DQBUF:
2456                 return et61x251_vidioc_dqbuf(cam, filp, arg);
2457
2458         case VIDIOC_STREAMON:
2459                 return et61x251_vidioc_streamon(cam, arg);
2460
2461         case VIDIOC_STREAMOFF:
2462                 return et61x251_vidioc_streamoff(cam, arg);
2463
2464         case VIDIOC_G_PARM:
2465                 return et61x251_vidioc_g_parm(cam, arg);
2466
2467         case VIDIOC_S_PARM:
2468                 return et61x251_vidioc_s_parm(cam, arg);
2469
2470         case VIDIOC_G_STD:
2471         case VIDIOC_S_STD:
2472         case VIDIOC_QUERYSTD:
2473         case VIDIOC_ENUMSTD:
2474         case VIDIOC_QUERYMENU:
2475         case VIDIOC_ENUM_FRAMEINTERVALS:
2476                 return -EINVAL;
2477
2478         default:
2479                 return -EINVAL;
2480
2481         }
2482 }
2483
2484
2485 static int et61x251_ioctl(struct inode* inode, struct file* filp,
2486                          unsigned int cmd, unsigned long arg)
2487 {
2488         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2489         int err = 0;
2490
2491         if (mutex_lock_interruptible(&cam->fileop_mutex))
2492                 return -ERESTARTSYS;
2493
2494         if (cam->state & DEV_DISCONNECTED) {
2495                 DBG(1, "Device not present");
2496                 mutex_unlock(&cam->fileop_mutex);
2497                 return -ENODEV;
2498         }
2499
2500         if (cam->state & DEV_MISCONFIGURED) {
2501                 DBG(1, "The camera is misconfigured. Close and open it "
2502                        "again.");
2503                 mutex_unlock(&cam->fileop_mutex);
2504                 return -EIO;
2505         }
2506
2507         V4LDBG(3, "et61x251", cmd);
2508
2509         err = et61x251_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2510
2511         mutex_unlock(&cam->fileop_mutex);
2512
2513         return err;
2514 }
2515
2516
2517 static const struct file_operations et61x251_fops = {
2518         .owner = THIS_MODULE,
2519         .open =    et61x251_open,
2520         .release = et61x251_release,
2521         .ioctl =   et61x251_ioctl,
2522         .compat_ioctl = v4l_compat_ioctl32,
2523         .read =    et61x251_read,
2524         .poll =    et61x251_poll,
2525         .mmap =    et61x251_mmap,
2526         .llseek =  no_llseek,
2527 };
2528
2529 /*****************************************************************************/
2530
2531 /* It exists a single interface only. We do not need to validate anything. */
2532 static int
2533 et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2534 {
2535         struct usb_device *udev = interface_to_usbdev(intf);
2536         struct et61x251_device* cam;
2537         static unsigned int dev_nr = 0;
2538         unsigned int i;
2539         int err = 0;
2540
2541         if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2542                 return -ENOMEM;
2543
2544         cam->usbdev = udev;
2545
2546         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2547                 DBG(1, "kmalloc() failed");
2548                 err = -ENOMEM;
2549                 goto fail;
2550         }
2551
2552         if (!(cam->v4ldev = video_device_alloc())) {
2553                 DBG(1, "video_device_alloc() failed");
2554                 err = -ENOMEM;
2555                 goto fail;
2556         }
2557
2558         DBG(2, "ET61X[12]51 PC Camera Controller detected "
2559                "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
2560
2561         for  (i = 0; et61x251_sensor_table[i]; i++) {
2562                 err = et61x251_sensor_table[i](cam);
2563                 if (!err)
2564                         break;
2565         }
2566
2567         if (!err)
2568                 DBG(2, "%s image sensor detected", cam->sensor.name);
2569         else {
2570                 DBG(1, "No supported image sensor detected");
2571                 err = -ENODEV;
2572                 goto fail;
2573         }
2574
2575         if (et61x251_init(cam)) {
2576                 DBG(1, "Initialization failed. I will retry on open().");
2577                 cam->state |= DEV_MISCONFIGURED;
2578         }
2579
2580         strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2581         cam->v4ldev->owner = THIS_MODULE;
2582         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2583         cam->v4ldev->hardware = 0;
2584         cam->v4ldev->fops = &et61x251_fops;
2585         cam->v4ldev->minor = video_nr[dev_nr];
2586         cam->v4ldev->release = video_device_release;
2587         video_set_drvdata(cam->v4ldev, cam);
2588
2589         init_completion(&cam->probe);
2590
2591         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2592                                     video_nr[dev_nr]);
2593         if (err) {
2594                 DBG(1, "V4L2 device registration failed");
2595                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2596                         DBG(1, "Free /dev/videoX node not found");
2597                 video_nr[dev_nr] = -1;
2598                 dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2599                 complete_all(&cam->probe);
2600                 goto fail;
2601         }
2602
2603         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2604
2605         cam->module_param.force_munmap = force_munmap[dev_nr];
2606         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2607
2608         dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2609
2610 #ifdef CONFIG_VIDEO_ADV_DEBUG
2611         err = et61x251_create_sysfs(cam);
2612         if (!err)
2613                 DBG(2, "Optional device control through 'sysfs' "
2614                        "interface ready");
2615         else
2616                 DBG(2, "Failed to create 'sysfs' interface for optional "
2617                        "device controlling. Error #%d", err);
2618 #else
2619         DBG(2, "Optional device control through 'sysfs' interface disabled");
2620         DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
2621                "configuration option to enable it.");
2622 #endif
2623
2624         usb_set_intfdata(intf, cam);
2625         kref_init(&cam->kref);
2626         usb_get_dev(cam->usbdev);
2627
2628         complete_all(&cam->probe);
2629
2630         return 0;
2631
2632 fail:
2633         if (cam) {
2634                 kfree(cam->control_buffer);
2635                 if (cam->v4ldev)
2636                         video_device_release(cam->v4ldev);
2637                 kfree(cam);
2638         }
2639         return err;
2640 }
2641
2642
2643 static void et61x251_usb_disconnect(struct usb_interface* intf)
2644 {
2645         struct et61x251_device* cam;
2646
2647         down_write(&et61x251_dev_lock);
2648
2649         cam = usb_get_intfdata(intf);
2650
2651         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2652
2653         if (cam->users) {
2654                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2655                        "memory deallocation are deferred.",
2656                     cam->v4ldev->minor);
2657                 cam->state |= DEV_MISCONFIGURED;
2658                 et61x251_stop_transfer(cam);
2659                 cam->state |= DEV_DISCONNECTED;
2660                 wake_up_interruptible(&cam->wait_frame);
2661                 wake_up(&cam->wait_stream);
2662         } else
2663                 cam->state |= DEV_DISCONNECTED;
2664
2665         wake_up_interruptible_all(&cam->wait_open);
2666
2667         kref_put(&cam->kref, et61x251_release_resources);
2668
2669         up_write(&et61x251_dev_lock);
2670 }
2671
2672
2673 static struct usb_driver et61x251_usb_driver = {
2674         .name =       "et61x251",
2675         .id_table =   et61x251_id_table,
2676         .probe =      et61x251_usb_probe,
2677         .disconnect = et61x251_usb_disconnect,
2678 };
2679
2680 /*****************************************************************************/
2681
2682 static int __init et61x251_module_init(void)
2683 {
2684         int err = 0;
2685
2686         KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2687         KDBG(3, ET61X251_MODULE_AUTHOR);
2688
2689         if ((err = usb_register(&et61x251_usb_driver)))
2690                 KDBG(1, "usb_register() failed");
2691
2692         return err;
2693 }
2694
2695
2696 static void __exit et61x251_module_exit(void)
2697 {
2698         usb_deregister(&et61x251_usb_driver);
2699 }
2700
2701
2702 module_init(et61x251_module_init);
2703 module_exit(et61x251_module_exit);