drivers/media/video/zc0301/zc0301_core.c

   1 /***************************************************************************
   2  * Video4Linux2 driver for ZC0301[P] Image Processor and Control Chip      *
   3  *                                                                         *
   4  * Copyright (C) 2006-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
   5  *                                                                         *
   6  * Informations about the chip internals needed to enable the I2C protocol *
   7  * have been taken from the documentation of the ZC030x Video4Linux1       *
   8  * driver written by Andrew Birkett <andy@nobugs.org>                      *
   9  *                                                                         *
  10  * This program is free software; you can redistribute it and/or modify    *
  11  * it under the terms of the GNU General Public License as published by    *
  12  * the Free Software Foundation; either version 2 of the License, or       *
  13  * (at your option) any later version.                                     *
  14  *                                                                         *
  15  * This program is distributed in the hope that it will be useful,         *
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  18  * GNU General Public License for more details.                            *
  19  *                                                                         *
  20  * You should have received a copy of the GNU General Public License       *
  21  * along with this program; if not, write to the Free Software             *
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  23  ***************************************************************************/
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/param.h>
  29 #include <linux/errno.h>
  30 #include <linux/slab.h>
  31 #include <linux/device.h>
  32 #include <linux/fs.h>
  33 #include <linux/delay.h>
  34 #include <linux/compiler.h>
  35 #include <linux/ioctl.h>
  36 #include <linux/poll.h>
  37 #include <linux/stat.h>
  38 #include <linux/mm.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/page-flags.h>
  41 #include <asm/byteorder.h>
  42 #include <asm/page.h>
  43 #include <asm/uaccess.h>
  44
  45 #include "zc0301.h"
  46
  47 /*****************************************************************************/
  48
  49 #define ZC0301_MODULE_NAME    "V4L2 driver for ZC0301[P] "                    \
  50                               "Image Processor and Control Chip"
  51 #define ZC0301_MODULE_AUTHOR  "(C) 2006-2007 Luca Risolia"
  52 #define ZC0301_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  53 #define ZC0301_MODULE_LICENSE "GPL"
  54 #define ZC0301_MODULE_VERSION "1:1.10"
  55 #define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 10)
  56
  57 /*****************************************************************************/
  58
  59 MODULE_DEVICE_TABLE(usb, zc0301_id_table);
  60
  61 MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL);
  62 MODULE_DESCRIPTION(ZC0301_MODULE_NAME);
  63 MODULE_VERSION(ZC0301_MODULE_VERSION);
  64 MODULE_LICENSE(ZC0301_MODULE_LICENSE);
  65
  66 static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1};
  67 module_param_array(video_nr, short, NULL, 0444);
  68 MODULE_PARM_DESC(video_nr,
  69                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  70                  "\n -1 = use next available (default)"
  71                  "\n  n = use minor number n (integer >= 0)"
  72                  "\nYou can specify up to "
  73                  __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way."
  74                  "\nFor example:"
  75                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  76                  "\nthe second registered camera and use auto for the first"
  77                  "\none and for every other camera."
  78                  "\n");
  79
  80 static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] =
  81                                ZC0301_FORCE_MUNMAP};
  82 module_param_array(force_munmap, bool, NULL, 0444);
  83 MODULE_PARM_DESC(force_munmap,
  84                  "\n<0|1[,...]> Force the application to unmap previously"
  85                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  86                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  87                  "\nthis feature. This parameter is specific for each"
  88                  "\ndetected camera."
  89                  "\n 0 = do not force memory unmapping"
  90                  "\n 1 = force memory unmapping (save memory)"
  91                  "\nDefault value is "__MODULE_STRING(ZC0301_FORCE_MUNMAP)"."
  92                  "\n");
  93
  94 static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] =
  95                                        ZC0301_FRAME_TIMEOUT};
  96 module_param_array(frame_timeout, uint, NULL, 0644);
  97 MODULE_PARM_DESC(frame_timeout,
  98                  "\n<n[,...]> Timeout for a video frame in seconds."
  99                  "\nThis parameter is specific for each detected camera."
 100                  "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"."
 101                  "\n");
 102
 103 #ifdef ZC0301_DEBUG
 104 static unsigned short debug = ZC0301_DEBUG_LEVEL;
 105 module_param(debug, ushort, 0644);
 106 MODULE_PARM_DESC(debug,
 107                  "\n<n> Debugging information level, from 0 to 3:"
 108                  "\n0 = none (use carefully)"
 109                  "\n1 = critical errors"
 110                  "\n2 = significant informations"
 111                  "\n3 = more verbose messages"
 112                  "\nLevel 3 is useful for testing only, when only "
 113                  "one device is used."
 114                  "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"."
 115                  "\n");
 116 #endif
 117
 118 /*****************************************************************************/
 119
 120 static u32
 121 zc0301_request_buffers(struct zc0301_device* cam, u32 count,
 122                        enum zc0301_io_method io)
 123 {
 124         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 125         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 126         const size_t imagesize = cam->module_param.force_munmap ||
 127                                  io == IO_READ ?
 128                                  (p->width * p->height * p->priv) / 8 :
 129                                  (r->width * r->height * p->priv) / 8;
 130         void* buff = NULL;
 131         u32 i;
 132
 133         if (count > ZC0301_MAX_FRAMES)
 134                 count = ZC0301_MAX_FRAMES;
 135
 136         cam->nbuffers = count;
 137         while (cam->nbuffers > 0) {
 138                 if ((buff = vmalloc_32_user(cam->nbuffers *
 139                                             PAGE_ALIGN(imagesize))))
 140                         break;
 141                 cam->nbuffers--;
 142         }
 143
 144         for (i = 0; i < cam->nbuffers; i++) {
 145                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 146                 cam->frame[i].buf.index = i;
 147                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 148                 cam->frame[i].buf.length = imagesize;
 149                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 150                 cam->frame[i].buf.sequence = 0;
 151                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 152                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 153                 cam->frame[i].buf.flags = 0;
 154         }
 155
 156         return cam->nbuffers;
 157 }
 158
 159
 160 static void zc0301_release_buffers(struct zc0301_device* cam)
 161 {
 162         if (cam->nbuffers) {
 163                 vfree(cam->frame[0].bufmem);
 164                 cam->nbuffers = 0;
 165         }
 166         cam->frame_current = NULL;
 167 }
 168
 169
 170 static void zc0301_empty_framequeues(struct zc0301_device* cam)
 171 {
 172         u32 i;
 173
 174         INIT_LIST_HEAD(&cam->inqueue);
 175         INIT_LIST_HEAD(&cam->outqueue);
 176
 177         for (i = 0; i < ZC0301_MAX_FRAMES; i++) {
 178                 cam->frame[i].state = F_UNUSED;
 179                 cam->frame[i].buf.bytesused = 0;
 180         }
 181 }
 182
 183
 184 static void zc0301_requeue_outqueue(struct zc0301_device* cam)
 185 {
 186         struct zc0301_frame_t *i;
 187
 188         list_for_each_entry(i, &cam->outqueue, frame) {
 189                 i->state = F_QUEUED;
 190                 list_add(&i->frame, &cam->inqueue);
 191         }
 192
 193         INIT_LIST_HEAD(&cam->outqueue);
 194 }
 195
 196
 197 static void zc0301_queue_unusedframes(struct zc0301_device* cam)
 198 {
 199         unsigned long lock_flags;
 200         u32 i;
 201
 202         for (i = 0; i < cam->nbuffers; i++)
 203                 if (cam->frame[i].state == F_UNUSED) {
 204                         cam->frame[i].state = F_QUEUED;
 205                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 206                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 207                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 208                 }
 209 }
 210
 211 /*****************************************************************************/
 212
 213 int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value)
 214 {
 215         struct usb_device* udev = cam->usbdev;
 216         int res;
 217
 218         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40,
 219                               value, index, NULL, 0, ZC0301_CTRL_TIMEOUT);
 220         if (res < 0) {
 221                 DBG(3, "Failed to write a register (index 0x%04X, "
 222                        "value 0x%02X, error %d)",index, value, res);
 223                 return -1;
 224         }
 225
 226         return 0;
 227 }
 228
 229
 230 int zc0301_read_reg(struct zc0301_device* cam, u16 index)
 231 {
 232         struct usb_device* udev = cam->usbdev;
 233         u8* buff = cam->control_buffer;
 234         int res;
 235
 236         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0,
 237                               0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT);
 238         if (res < 0)
 239                 DBG(3, "Failed to read a register (index 0x%04X, error %d)",
 240                     index, res);
 241
 242         PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff));
 243
 244         return (res >= 0) ? (int)(*buff) : -1;
 245 }
 246
 247
 248 int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length)
 249 {
 250         int err = 0, res, r0, r1;
 251
 252         err += zc0301_write_reg(cam, 0x0092, address);
 253         err += zc0301_write_reg(cam, 0x0090, 0x02);
 254
 255         msleep(1);
 256
 257         res = zc0301_read_reg(cam, 0x0091);
 258         if (res < 0)
 259                 err += res;
 260         r0 = zc0301_read_reg(cam, 0x0095);
 261         if (r0 < 0)
 262                 err += r0;
 263         r1 = zc0301_read_reg(cam, 0x0096);
 264         if (r1 < 0)
 265                 err += r1;
 266
 267         res = (length <= 1) ? r0 : r0 | (r1 << 8);
 268
 269         if (err)
 270                 DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X",
 271                     address, res);
 272
 273
 274         PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res);
 275
 276         return err ? -1 : res;
 277 }
 278
 279
 280 int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value)
 281 {
 282         int err = 0, res;
 283
 284         err += zc0301_write_reg(cam, 0x0092, address);
 285         err += zc0301_write_reg(cam, 0x0093, value & 0xff);
 286         err += zc0301_write_reg(cam, 0x0094, value >> 8);
 287         err += zc0301_write_reg(cam, 0x0090, 0x01);
 288
 289         msleep(1);
 290
 291         res = zc0301_read_reg(cam, 0x0091);
 292         if (res < 0)
 293                 err += res;
 294
 295         if (err)
 296                 DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X",
 297                     address, value);
 298
 299         PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value);
 300
 301         return err ? -1 : 0;
 302 }
 303
 304 /*****************************************************************************/
 305
 306 static void zc0301_urb_complete(struct urb *urb)
 307 {
 308         struct zc0301_device* cam = urb->context;
 309         struct zc0301_frame_t** f;
 310         size_t imagesize;
 311         u8 i;
 312         int err = 0;
 313
 314         if (urb->status == -ENOENT)
 315                 return;
 316
 317         f = &cam->frame_current;
 318
 319         if (cam->stream == STREAM_INTERRUPT) {
 320                 cam->stream = STREAM_OFF;
 321                 if ((*f))
 322                         (*f)->state = F_QUEUED;
 323                 DBG(3, "Stream interrupted");
 324                 wake_up(&cam->wait_stream);
 325         }
 326
 327         if (cam->state & DEV_DISCONNECTED)
 328                 return;
 329
 330         if (cam->state & DEV_MISCONFIGURED) {
 331                 wake_up_interruptible(&cam->wait_frame);
 332                 return;
 333         }
 334
 335         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 336                 goto resubmit_urb;
 337
 338         if (!(*f))
 339                 (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t,
 340                                   frame);
 341
 342         imagesize = (cam->sensor.pix_format.width *
 343                      cam->sensor.pix_format.height *
 344                      cam->sensor.pix_format.priv) / 8;
 345
 346         for (i = 0; i < urb->number_of_packets; i++) {
 347                 unsigned int len, status;
 348                 void *pos;
 349                 u16* soi;
 350                 u8 sof;
 351
 352                 len = urb->iso_frame_desc[i].actual_length;
 353                 status = urb->iso_frame_desc[i].status;
 354                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 355
 356                 if (status) {
 357                         DBG(3, "Error in isochronous frame");
 358                         (*f)->state = F_ERROR;
 359                         continue;
 360                 }
 361
 362                 sof = (*(soi = pos) == 0xd8ff);
 363
 364                 PDBGG("Isochrnous frame: length %u, #%u i,", len, i);
 365
 366                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 367 start_of_frame:
 368                         if (sof) {
 369                                 (*f)->state = F_GRABBING;
 370                                 (*f)->buf.bytesused = 0;
 371                                 do_gettimeofday(&(*f)->buf.timestamp);
 372                                 DBG(3, "SOF detected: new video frame");
 373                         }
 374
 375                 if ((*f)->state == F_GRABBING) {
 376                         if (sof && (*f)->buf.bytesused)
 377                                         goto end_of_frame;
 378
 379                         if ((*f)->buf.bytesused + len > imagesize) {
 380                                 DBG(3, "Video frame size exceeded");
 381                                 (*f)->state = F_ERROR;
 382                                 continue;
 383                         }
 384
 385                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len);
 386                         (*f)->buf.bytesused += len;
 387
 388                         if ((*f)->buf.bytesused == imagesize) {
 389                                 u32 b;
 390 end_of_frame:
 391                                 b = (*f)->buf.bytesused;
 392                                 (*f)->state = F_DONE;
 393                                 (*f)->buf.sequence= ++cam->frame_count;
 394                                 spin_lock(&cam->queue_lock);
 395                                 list_move_tail(&(*f)->frame, &cam->outqueue);
 396                                 if (!list_empty(&cam->inqueue))
 397                                         (*f) = list_entry(cam->inqueue.next,
 398                                                        struct zc0301_frame_t,
 399                                                           frame);
 400                                 else
 401                                         (*f) = NULL;
 402                                 spin_unlock(&cam->queue_lock);
 403                                 DBG(3, "Video frame captured: : %lu bytes",
 404                                        (unsigned long)(b));
 405
 406                                 if (!(*f))
 407                                         goto resubmit_urb;
 408
 409                                 if (sof)
 410                                         goto start_of_frame;
 411                         }
 412                 }
 413         }
 414
 415 resubmit_urb:
 416         urb->dev = cam->usbdev;
 417         err = usb_submit_urb(urb, GFP_ATOMIC);
 418         if (err < 0 && err != -EPERM) {
 419                 cam->state |= DEV_MISCONFIGURED;
 420                 DBG(1, "usb_submit_urb() failed");
 421         }
 422
 423         wake_up_interruptible(&cam->wait_frame);
 424 }
 425
 426
 427 static int zc0301_start_transfer(struct zc0301_device* cam)
 428 {
 429         struct usb_device *udev = cam->usbdev;
 430         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 431                                                      usb_ifnum_to_if(udev, 0),
 432                                                      ZC0301_ALTERNATE_SETTING);
 433         const unsigned int psz = le16_to_cpu(altsetting->
 434                                              endpoint[0].desc.wMaxPacketSize);
 435         struct urb* urb;
 436         s8 i, j;
 437         int err = 0;
 438
 439         for (i = 0; i < ZC0301_URBS; i++) {
 440                 cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz,
 441                                                   GFP_KERNEL);
 442                 if (!cam->transfer_buffer[i]) {
 443                         err = -ENOMEM;
 444                         DBG(1, "Not enough memory");
 445                         goto free_buffers;
 446                 }
 447         }
 448
 449         for (i = 0; i < ZC0301_URBS; i++) {
 450                 urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL);
 451                 cam->urb[i] = urb;
 452                 if (!urb) {
 453                         err = -ENOMEM;
 454                         DBG(1, "usb_alloc_urb() failed");
 455                         goto free_urbs;
 456                 }
 457                 urb->dev = udev;
 458                 urb->context = cam;
 459                 urb->pipe = usb_rcvisocpipe(udev, 1);
 460                 urb->transfer_flags = URB_ISO_ASAP;
 461                 urb->number_of_packets = ZC0301_ISO_PACKETS;
 462                 urb->complete = zc0301_urb_complete;
 463                 urb->transfer_buffer = cam->transfer_buffer[i];
 464                 urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS;
 465                 urb->interval = 1;
 466                 for (j = 0; j < ZC0301_ISO_PACKETS; j++) {
 467                         urb->iso_frame_desc[j].offset = psz * j;
 468                         urb->iso_frame_desc[j].length = psz;
 469                 }
 470         }
 471
 472         err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING);
 473         if (err) {
 474                 DBG(1, "usb_set_interface() failed");
 475                 goto free_urbs;
 476         }
 477
 478         cam->frame_current = NULL;
 479
 480         for (i = 0; i < ZC0301_URBS; i++) {
 481                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 482                 if (err) {
 483                         for (j = i-1; j >= 0; j--)
 484                                 usb_kill_urb(cam->urb[j]);
 485                         DBG(1, "usb_submit_urb() failed, error %d", err);
 486                         goto free_urbs;
 487                 }
 488         }
 489
 490         return 0;
 491
 492 free_urbs:
 493         for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++)
 494                 usb_free_urb(cam->urb[i]);
 495
 496 free_buffers:
 497         for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++)
 498                 kfree(cam->transfer_buffer[i]);
 499
 500         return err;
 501 }
 502
 503
 504 static int zc0301_stop_transfer(struct zc0301_device* cam)
 505 {
 506         struct usb_device *udev = cam->usbdev;
 507         s8 i;
 508         int err = 0;
 509
 510         if (cam->state & DEV_DISCONNECTED)
 511                 return 0;
 512
 513         for (i = ZC0301_URBS-1; i >= 0; i--) {
 514                 usb_kill_urb(cam->urb[i]);
 515                 usb_free_urb(cam->urb[i]);
 516                 kfree(cam->transfer_buffer[i]);
 517         }
 518
 519         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 520         if (err)
 521                 DBG(3, "usb_set_interface() failed");
 522
 523         return err;
 524 }
 525
 526
 527 static int zc0301_stream_interrupt(struct zc0301_device* cam)
 528 {
 529         long timeout;
 530
 531         cam->stream = STREAM_INTERRUPT;
 532         timeout = wait_event_timeout(cam->wait_stream,
 533                                      (cam->stream == STREAM_OFF) ||
 534                                      (cam->state & DEV_DISCONNECTED),
 535                                      ZC0301_URB_TIMEOUT);
 536         if (cam->state & DEV_DISCONNECTED)
 537                 return -ENODEV;
 538         else if (cam->stream != STREAM_OFF) {
 539                 cam->state |= DEV_MISCONFIGURED;
 540                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
 541                        "use it, close and open %s again.",
 542                     video_device_node_name(cam->v4ldev));
 543                 return -EIO;
 544         }
 545
 546         return 0;
 547 }
 548
 549 /*****************************************************************************/
 550
 551 static int
 552 zc0301_set_compression(struct zc0301_device* cam,
 553                        struct v4l2_jpegcompression* compression)
 554 {
 555         int r, err = 0;
 556
 557         if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
 558                 err += r;
 559         err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
 560
 561         return err ? -EIO : 0;
 562 }
 563
 564
 565 static int zc0301_init(struct zc0301_device* cam)
 566 {
 567         struct zc0301_sensor* s = &cam->sensor;
 568         struct v4l2_control ctrl;
 569         struct v4l2_queryctrl *qctrl;
 570         struct v4l2_rect* rect;
 571         u8 i = 0;
 572         int err = 0;
 573
 574         if (!(cam->state & DEV_INITIALIZED)) {
 575                 mutex_init(&cam->open_mutex);
 576                 init_waitqueue_head(&cam->wait_open);
 577                 qctrl = s->qctrl;
 578                 rect = &(s->cropcap.defrect);
 579                 cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
 580         } else { /* use current values */
 581                 qctrl = s->_qctrl;
 582                 rect = &(s->_rect);
 583         }
 584
 585         if (s->init) {
 586                 err = s->init(cam);
 587                 if (err) {
 588                         DBG(3, "Sensor initialization failed");
 589                         return err;
 590                 }
 591         }
 592
 593         if ((err = zc0301_set_compression(cam, &cam->compression))) {
 594                 DBG(3, "set_compression() failed");
 595                 return err;
 596         }
 597
 598         if (s->set_crop)
 599                 if ((err = s->set_crop(cam, rect))) {
 600                         DBG(3, "set_crop() failed");
 601                         return err;
 602                 }
 603
 604         if (s->set_ctrl) {
 605                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
 606                         if (s->qctrl[i].id != 0 &&
 607                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
 608                                 ctrl.id = s->qctrl[i].id;
 609                                 ctrl.value = qctrl[i].default_value;
 610                                 err = s->set_ctrl(cam, &ctrl);
 611                                 if (err) {
 612                                         DBG(3, "Set %s control failed",
 613                                             s->qctrl[i].name);
 614                                         return err;
 615                                 }
 616                                 DBG(3, "Image sensor supports '%s' control",
 617                                     s->qctrl[i].name);
 618                         }
 619         }
 620
 621         if (!(cam->state & DEV_INITIALIZED)) {
 622                 mutex_init(&cam->fileop_mutex);
 623                 spin_lock_init(&cam->queue_lock);
 624                 init_waitqueue_head(&cam->wait_frame);
 625                 init_waitqueue_head(&cam->wait_stream);
 626                 cam->nreadbuffers = 2;
 627                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
 628                 memcpy(&(s->_rect), &(s->cropcap.defrect),
 629                        sizeof(struct v4l2_rect));
 630                 cam->state |= DEV_INITIALIZED;
 631         }
 632
 633         DBG(2, "Initialization succeeded");
 634         return 0;
 635 }
 636
 637 /*****************************************************************************/
 638
 639 static void zc0301_release_resources(struct kref *kref)
 640 {
 641         struct zc0301_device *cam = container_of(kref, struct zc0301_device,
 642                                                  kref);
 643         DBG(2, "V4L2 device %s deregistered",
 644             video_device_node_name(cam->v4ldev));
 645         video_set_drvdata(cam->v4ldev, NULL);
 646         video_unregister_device(cam->v4ldev);
 647         usb_put_dev(cam->usbdev);
 648         kfree(cam->control_buffer);
 649         kfree(cam);
 650 }
 651
 652
 653 static int zc0301_open(struct file *filp)
 654 {
 655         struct zc0301_device* cam;
 656         int err = 0;
 657
 658         if (!down_read_trylock(&zc0301_dev_lock))
 659                 return -EAGAIN;
 660
 661         cam = video_drvdata(filp);
 662
 663         if (wait_for_completion_interruptible(&cam->probe)) {
 664                 up_read(&zc0301_dev_lock);
 665                 return -ERESTARTSYS;
 666         }
 667
 668         kref_get(&cam->kref);
 669
 670         if (mutex_lock_interruptible(&cam->open_mutex)) {
 671                 kref_put(&cam->kref, zc0301_release_resources);
 672                 up_read(&zc0301_dev_lock);
 673                 return -ERESTARTSYS;
 674         }
 675
 676         if (cam->state & DEV_DISCONNECTED) {
 677                 DBG(1, "Device not present");
 678                 err = -ENODEV;
 679                 goto out;
 680         }
 681
 682         if (cam->users) {
 683                 DBG(2, "Device %s is busy...",
 684                     video_device_node_name(cam->v4ldev));
 685                 DBG(3, "Simultaneous opens are not supported");
 686                 if ((filp->f_flags & O_NONBLOCK) ||
 687                     (filp->f_flags & O_NDELAY)) {
 688                         err = -EWOULDBLOCK;
 689                         goto out;
 690                 }
 691                 DBG(2, "A blocking open() has been requested. Wait for the "
 692                        "device to be released...");
 693                 up_read(&zc0301_dev_lock);
 694                 err = wait_event_interruptible_exclusive(cam->wait_open,
 695                                                 (cam->state & DEV_DISCONNECTED)
 696                                                          || !cam->users);
 697                 down_read(&zc0301_dev_lock);
 698                 if (err)
 699                         goto out;
 700                 if (cam->state & DEV_DISCONNECTED) {
 701                         err = -ENODEV;
 702                         goto out;
 703                 }
 704         }
 705
 706         if (cam->state & DEV_MISCONFIGURED) {
 707                 err = zc0301_init(cam);
 708                 if (err) {
 709                         DBG(1, "Initialization failed again. "
 710                                "I will retry on next open().");
 711                         goto out;
 712                 }
 713                 cam->state &= ~DEV_MISCONFIGURED;
 714         }
 715
 716         if ((err = zc0301_start_transfer(cam)))
 717                 goto out;
 718
 719         filp->private_data = cam;
 720         cam->users++;
 721         cam->io = IO_NONE;
 722         cam->stream = STREAM_OFF;
 723         cam->nbuffers = 0;
 724         cam->frame_count = 0;
 725         zc0301_empty_framequeues(cam);
 726
 727         DBG(3, "Video device %s is open",
 728             video_device_node_name(cam->v4ldev));
 729
 730 out:
 731         mutex_unlock(&cam->open_mutex);
 732         if (err)
 733                 kref_put(&cam->kref, zc0301_release_resources);
 734         up_read(&zc0301_dev_lock);
 735         return err;
 736 }
 737
 738
 739 static int zc0301_release(struct file *filp)
 740 {
 741         struct zc0301_device* cam;
 742
 743         down_write(&zc0301_dev_lock);
 744
 745         cam = video_drvdata(filp);
 746
 747         zc0301_stop_transfer(cam);
 748         zc0301_release_buffers(cam);
 749         cam->users--;
 750         wake_up_interruptible_nr(&cam->wait_open, 1);
 751
 752         DBG(3, "Video device %s closed",
 753             video_device_node_name(cam->v4ldev));
 754
 755         kref_put(&cam->kref, zc0301_release_resources);
 756
 757         up_write(&zc0301_dev_lock);
 758
 759         return 0;
 760 }
 761
 762
 763 static ssize_t
 764 zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
 765 {
 766         struct zc0301_device *cam = video_drvdata(filp);
 767         struct zc0301_frame_t* f, * i;
 768         unsigned long lock_flags;
 769         long timeout;
 770         int err = 0;
 771
 772         if (mutex_lock_interruptible(&cam->fileop_mutex))
 773                 return -ERESTARTSYS;
 774
 775         if (cam->state & DEV_DISCONNECTED) {
 776                 DBG(1, "Device not present");
 777                 mutex_unlock(&cam->fileop_mutex);
 778                 return -ENODEV;
 779         }
 780
 781         if (cam->state & DEV_MISCONFIGURED) {
 782                 DBG(1, "The camera is misconfigured. Close and open it "
 783                        "again.");
 784                 mutex_unlock(&cam->fileop_mutex);
 785                 return -EIO;
 786         }
 787
 788         if (cam->io == IO_MMAP) {
 789                 DBG(3, "Close and open the device again to choose the read "
 790                        "method");
 791                 mutex_unlock(&cam->fileop_mutex);
 792                 return -EBUSY;
 793         }
 794
 795         if (cam->io == IO_NONE) {
 796                 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
 797                         DBG(1, "read() failed, not enough memory");
 798                         mutex_unlock(&cam->fileop_mutex);
 799                         return -ENOMEM;
 800                 }
 801                 cam->io = IO_READ;
 802                 cam->stream = STREAM_ON;
 803         }
 804
 805         if (list_empty(&cam->inqueue)) {
 806                 if (!list_empty(&cam->outqueue))
 807                         zc0301_empty_framequeues(cam);
 808                 zc0301_queue_unusedframes(cam);
 809         }
 810
 811         if (!count) {
 812                 mutex_unlock(&cam->fileop_mutex);
 813                 return 0;
 814         }
 815
 816         if (list_empty(&cam->outqueue)) {
 817                 if (filp->f_flags & O_NONBLOCK) {
 818                         mutex_unlock(&cam->fileop_mutex);
 819                         return -EAGAIN;
 820                 }
 821                 timeout = wait_event_interruptible_timeout
 822                           ( cam->wait_frame,
 823                             (!list_empty(&cam->outqueue)) ||
 824                             (cam->state & DEV_DISCONNECTED) ||
 825                             (cam->state & DEV_MISCONFIGURED),
 826                             msecs_to_jiffies(
 827                                 cam->module_param.frame_timeout * 1000
 828                             )
 829                           );
 830                 if (timeout < 0) {
 831                         mutex_unlock(&cam->fileop_mutex);
 832                         return timeout;
 833                 }
 834                 if (cam->state & DEV_DISCONNECTED) {
 835                         mutex_unlock(&cam->fileop_mutex);
 836                         return -ENODEV;
 837                 }
 838                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
 839                         mutex_unlock(&cam->fileop_mutex);
 840                         return -EIO;
 841                 }
 842         }
 843
 844         f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame);
 845
 846         if (count > f->buf.bytesused)
 847                 count = f->buf.bytesused;
 848
 849         if (copy_to_user(buf, f->bufmem, count)) {
 850                 err = -EFAULT;
 851                 goto exit;
 852         }
 853         *f_pos += count;
 854
 855 exit:
 856         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 857         list_for_each_entry(i, &cam->outqueue, frame)
 858                 i->state = F_UNUSED;
 859         INIT_LIST_HEAD(&cam->outqueue);
 860         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 861
 862         zc0301_queue_unusedframes(cam);
 863
 864         PDBGG("Frame #%lu, bytes read: %zu",
 865               (unsigned long)f->buf.index, count);
 866
 867         mutex_unlock(&cam->fileop_mutex);
 868
 869         return err ? err : count;
 870 }
 871
 872
 873 static unsigned int zc0301_poll(struct file *filp, poll_table *wait)
 874 {
 875         struct zc0301_device *cam = video_drvdata(filp);
 876         struct zc0301_frame_t* f;
 877         unsigned long lock_flags;
 878         unsigned int mask = 0;
 879
 880         if (mutex_lock_interruptible(&cam->fileop_mutex))
 881                 return POLLERR;
 882
 883         if (cam->state & DEV_DISCONNECTED) {
 884                 DBG(1, "Device not present");
 885                 goto error;
 886         }
 887
 888         if (cam->state & DEV_MISCONFIGURED) {
 889                 DBG(1, "The camera is misconfigured. Close and open it "
 890                        "again.");
 891                 goto error;
 892         }
 893
 894         if (cam->io == IO_NONE) {
 895                 if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) {
 896                         DBG(1, "poll() failed, not enough memory");
 897                         goto error;
 898                 }
 899                 cam->io = IO_READ;
 900                 cam->stream = STREAM_ON;
 901         }
 902
 903         if (cam->io == IO_READ) {
 904                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
 905                 list_for_each_entry(f, &cam->outqueue, frame)
 906                         f->state = F_UNUSED;
 907                 INIT_LIST_HEAD(&cam->outqueue);
 908                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 909                 zc0301_queue_unusedframes(cam);
 910         }
 911
 912         poll_wait(filp, &cam->wait_frame, wait);
 913
 914         if (!list_empty(&cam->outqueue))
 915                 mask |= POLLIN | POLLRDNORM;
 916
 917         mutex_unlock(&cam->fileop_mutex);
 918
 919         return mask;
 920
 921 error:
 922         mutex_unlock(&cam->fileop_mutex);
 923         return POLLERR;
 924 }
 925
 926
 927 static void zc0301_vm_open(struct vm_area_struct* vma)
 928 {
 929         struct zc0301_frame_t* f = vma->vm_private_data;
 930         f->vma_use_count++;
 931 }
 932
 933
 934 static void zc0301_vm_close(struct vm_area_struct* vma)
 935 {
 936         /* NOTE: buffers are not freed here */
 937         struct zc0301_frame_t* f = vma->vm_private_data;
 938         f->vma_use_count--;
 939 }
 940
 941
 942 static const struct vm_operations_struct zc0301_vm_ops = {
 943         .open = zc0301_vm_open,
 944         .close = zc0301_vm_close,
 945 };
 946
 947
 948 static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
 949 {
 950         struct zc0301_device *cam = video_drvdata(filp);
 951         unsigned long size = vma->vm_end - vma->vm_start,
 952                       start = vma->vm_start;
 953         void *pos;
 954         u32 i;
 955
 956         if (mutex_lock_interruptible(&cam->fileop_mutex))
 957                 return -ERESTARTSYS;
 958
 959         if (cam->state & DEV_DISCONNECTED) {
 960                 DBG(1, "Device not present");
 961                 mutex_unlock(&cam->fileop_mutex);
 962                 return -ENODEV;
 963         }
 964
 965         if (cam->state & DEV_MISCONFIGURED) {
 966                 DBG(1, "The camera is misconfigured. Close and open it "
 967                        "again.");
 968                 mutex_unlock(&cam->fileop_mutex);
 969                 return -EIO;
 970         }
 971
 972         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
 973                 mutex_unlock(&cam->fileop_mutex);
 974                 return -EACCES;
 975         }
 976
 977         if (cam->io != IO_MMAP ||
 978             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
 979                 mutex_unlock(&cam->fileop_mutex);
 980                 return -EINVAL;
 981         }
 982
 983         for (i = 0; i < cam->nbuffers; i++) {
 984                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
 985                         break;
 986         }
 987         if (i == cam->nbuffers) {
 988                 mutex_unlock(&cam->fileop_mutex);
 989                 return -EINVAL;
 990         }
 991
 992         vma->vm_flags |= VM_IO;
 993         vma->vm_flags |= VM_RESERVED;
 994
 995         pos = cam->frame[i].bufmem;
 996         while (size > 0) { /* size is page-aligned */
 997                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
 998                         mutex_unlock(&cam->fileop_mutex);
 999                         return -EAGAIN;
1000                 }
1001                 start += PAGE_SIZE;
1002                 pos += PAGE_SIZE;
1003                 size -= PAGE_SIZE;
1004         }
1005
1006         vma->vm_ops = &zc0301_vm_ops;
1007         vma->vm_private_data = &cam->frame[i];
1008         zc0301_vm_open(vma);
1009
1010         mutex_unlock(&cam->fileop_mutex);
1011
1012         return 0;
1013 }
1014
1015 /*****************************************************************************/
1016
1017 static int
1018 zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg)
1019 {
1020         struct v4l2_capability cap = {
1021                 .driver = "zc0301",
1022                 .version = ZC0301_MODULE_VERSION_CODE,
1023                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1024                                 V4L2_CAP_STREAMING,
1025         };
1026
1027         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1028         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1029                 strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
1030                         sizeof(cap.bus_info));
1031
1032         if (copy_to_user(arg, &cap, sizeof(cap)))
1033                 return -EFAULT;
1034
1035         return 0;
1036 }
1037
1038
1039 static int
1040 zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
1041 {
1042         struct v4l2_input i;
1043
1044         if (copy_from_user(&i, arg, sizeof(i)))
1045                 return -EFAULT;
1046
1047         if (i.index)
1048                 return -EINVAL;
1049
1050         memset(&i, 0, sizeof(i));
1051         strcpy(i.name, "Camera");
1052         i.type = V4L2_INPUT_TYPE_CAMERA;
1053
1054         if (copy_to_user(arg, &i, sizeof(i)))
1055                 return -EFAULT;
1056
1057         return 0;
1058 }
1059
1060
1061 static int
1062 zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
1063 {
1064         int index = 0;
1065
1066         if (copy_to_user(arg, &index, sizeof(index)))
1067                 return -EFAULT;
1068
1069         return 0;
1070 }
1071
1072
1073 static int
1074 zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
1075 {
1076         int index;
1077
1078         if (copy_from_user(&index, arg, sizeof(index)))
1079                 return -EFAULT;
1080
1081         if (index != 0)
1082                 return -EINVAL;
1083
1084         return 0;
1085 }
1086
1087
1088 static int
1089 zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg)
1090 {
1091         struct zc0301_sensor* s = &cam->sensor;
1092         struct v4l2_queryctrl qc;
1093         u8 i;
1094
1095         if (copy_from_user(&qc, arg, sizeof(qc)))
1096                 return -EFAULT;
1097
1098         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1099                 if (qc.id && qc.id == s->qctrl[i].id) {
1100                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1101                         if (copy_to_user(arg, &qc, sizeof(qc)))
1102                                 return -EFAULT;
1103                         return 0;
1104                 }
1105
1106         return -EINVAL;
1107 }
1108
1109
1110 static int
1111 zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg)
1112 {
1113         struct zc0301_sensor* s = &cam->sensor;
1114         struct v4l2_control ctrl;
1115         int err = 0;
1116         u8 i;
1117
1118         if (!s->get_ctrl && !s->set_ctrl)
1119                 return -EINVAL;
1120
1121         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1122                 return -EFAULT;
1123
1124         if (!s->get_ctrl) {
1125                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1126                         if (ctrl.id == s->qctrl[i].id) {
1127                                 ctrl.value = s->_qctrl[i].default_value;
1128                                 goto exit;
1129                         }
1130                 return -EINVAL;
1131         } else
1132                 err = s->get_ctrl(cam, &ctrl);
1133
1134 exit:
1135         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1136                 return -EFAULT;
1137
1138         return err;
1139 }
1140
1141
1142 static int
1143 zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg)
1144 {
1145         struct zc0301_sensor* s = &cam->sensor;
1146         struct v4l2_control ctrl;
1147         u8 i;
1148         int err = 0;
1149
1150         if (!s->set_ctrl)
1151                 return -EINVAL;
1152
1153         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1154                 return -EFAULT;
1155
1156         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1157                 if (ctrl.id == s->qctrl[i].id) {
1158                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1159                                 return -EINVAL;
1160                         if (ctrl.value < s->qctrl[i].minimum ||
1161                             ctrl.value > s->qctrl[i].maximum)
1162                                 return -ERANGE;
1163                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1164                         break;
1165                 }
1166
1167         if ((err = s->set_ctrl(cam, &ctrl)))
1168                 return err;
1169
1170         s->_qctrl[i].default_value = ctrl.value;
1171
1172         return 0;
1173 }
1174
1175
1176 static int
1177 zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg)
1178 {
1179         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1180
1181         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1182         cc->pixelaspect.numerator = 1;
1183         cc->pixelaspect.denominator = 1;
1184
1185         if (copy_to_user(arg, cc, sizeof(*cc)))
1186                 return -EFAULT;
1187
1188         return 0;
1189 }
1190
1191
1192 static int
1193 zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg)
1194 {
1195         struct zc0301_sensor* s = &cam->sensor;
1196         struct v4l2_crop crop = {
1197                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1198         };
1199
1200         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1201
1202         if (copy_to_user(arg, &crop, sizeof(crop)))
1203                 return -EFAULT;
1204
1205         return 0;
1206 }
1207
1208
1209 static int
1210 zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
1211 {
1212         struct zc0301_sensor* s = &cam->sensor;
1213         struct v4l2_crop crop;
1214         struct v4l2_rect* rect;
1215         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1216         const enum zc0301_stream_state stream = cam->stream;
1217         const u32 nbuffers = cam->nbuffers;
1218         u32 i;
1219         int err = 0;
1220
1221         if (copy_from_user(&crop, arg, sizeof(crop)))
1222                 return -EFAULT;
1223
1224         rect = &(crop.c);
1225
1226         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1227                 return -EINVAL;
1228
1229         if (cam->module_param.force_munmap)
1230                 for (i = 0; i < cam->nbuffers; i++)
1231                         if (cam->frame[i].vma_use_count) {
1232                                 DBG(3, "VIDIOC_S_CROP failed. "
1233                                        "Unmap the buffers first.");
1234                                 return -EBUSY;
1235                         }
1236
1237         if (!s->set_crop) {
1238                 memcpy(rect, &(s->_rect), sizeof(*rect));
1239                 if (copy_to_user(arg, &crop, sizeof(crop)))
1240                         return -EFAULT;
1241                 return 0;
1242         }
1243
1244         rect->left &= ~7L;
1245         rect->top &= ~7L;
1246         if (rect->width < 8)
1247                 rect->width = 8;
1248         if (rect->height < 8)
1249                 rect->height = 8;
1250         if (rect->width > bounds->width)
1251                 rect->width = bounds->width;
1252         if (rect->height > bounds->height)
1253                 rect->height = bounds->height;
1254         if (rect->left < bounds->left)
1255                 rect->left = bounds->left;
1256         if (rect->top < bounds->top)
1257                 rect->top = bounds->top;
1258         if (rect->left + rect->width > bounds->left + bounds->width)
1259                 rect->left = bounds->left+bounds->width - rect->width;
1260         if (rect->top + rect->height > bounds->top + bounds->height)
1261                 rect->top = bounds->top+bounds->height - rect->height;
1262         rect->width &= ~7L;
1263         rect->height &= ~7L;
1264
1265         if (cam->stream == STREAM_ON)
1266                 if ((err = zc0301_stream_interrupt(cam)))
1267                         return err;
1268
1269         if (copy_to_user(arg, &crop, sizeof(crop))) {
1270                 cam->stream = stream;
1271                 return -EFAULT;
1272         }
1273
1274         if (cam->module_param.force_munmap || cam->io == IO_READ)
1275                 zc0301_release_buffers(cam);
1276
1277         if (s->set_crop)
1278                 err += s->set_crop(cam, rect);
1279
1280         if (err) { /* atomic, no rollback in ioctl() */
1281                 cam->state |= DEV_MISCONFIGURED;
1282                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1283                        "use the camera, close and open %s again.",
1284                     video_device_node_name(cam->v4ldev));
1285                 return -EIO;
1286         }
1287
1288         s->pix_format.width = rect->width;
1289         s->pix_format.height = rect->height;
1290         memcpy(&(s->_rect), rect, sizeof(*rect));
1291
1292         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1293             nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1294                 cam->state |= DEV_MISCONFIGURED;
1295                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1296                        "use the camera, close and open %s again.",
1297                     video_device_node_name(cam->v4ldev));
1298                 return -ENOMEM;
1299         }
1300
1301         if (cam->io == IO_READ)
1302                 zc0301_empty_framequeues(cam);
1303         else if (cam->module_param.force_munmap)
1304                 zc0301_requeue_outqueue(cam);
1305
1306         cam->stream = stream;
1307
1308         return 0;
1309 }
1310
1311
1312 static int
1313 zc0301_vidioc_enum_framesizes(struct zc0301_device* cam, void __user * arg)
1314 {
1315         struct v4l2_frmsizeenum frmsize;
1316
1317         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1318                 return -EFAULT;
1319
1320         if (frmsize.index != 0 && frmsize.index != 1)
1321                 return -EINVAL;
1322
1323         if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG)
1324                 return -EINVAL;
1325
1326         frmsize.type = V4L2_FRMSIZE_TYPE_DISCRETE;
1327
1328         if (frmsize.index == 1) {
1329                 frmsize.discrete.width = cam->sensor.cropcap.defrect.width;
1330                 frmsize.discrete.height = cam->sensor.cropcap.defrect.height;
1331         }
1332         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1333
1334         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1335                 return -EFAULT;
1336
1337         return 0;
1338 }
1339
1340
1341 static int
1342 zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg)
1343 {
1344         struct v4l2_fmtdesc fmtd;
1345
1346         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1347                 return -EFAULT;
1348
1349         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1350                 return -EINVAL;
1351
1352         if (fmtd.index == 0) {
1353                 strcpy(fmtd.description, "JPEG");
1354                 fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
1355                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1356         } else
1357                 return -EINVAL;
1358
1359         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1360         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1361
1362         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1363                 return -EFAULT;
1364
1365         return 0;
1366 }
1367
1368
1369 static int
1370 zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg)
1371 {
1372         struct v4l2_format format;
1373         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1374
1375         if (copy_from_user(&format, arg, sizeof(format)))
1376                 return -EFAULT;
1377
1378         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1379                 return -EINVAL;
1380
1381         pfmt->bytesperline = 0;
1382         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1383         pfmt->field = V4L2_FIELD_NONE;
1384         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1385
1386         if (copy_to_user(arg, &format, sizeof(format)))
1387                 return -EFAULT;
1388
1389         return 0;
1390 }
1391
1392
1393 static int
1394 zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
1395                         void __user * arg)
1396 {
1397         struct zc0301_sensor* s = &cam->sensor;
1398         struct v4l2_format format;
1399         struct v4l2_pix_format* pix;
1400         struct v4l2_pix_format* pfmt = &(s->pix_format);
1401         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1402         struct v4l2_rect rect;
1403         const enum zc0301_stream_state stream = cam->stream;
1404         const u32 nbuffers = cam->nbuffers;
1405         u32 i;
1406         int err = 0;
1407
1408         if (copy_from_user(&format, arg, sizeof(format)))
1409                 return -EFAULT;
1410
1411         pix = &(format.fmt.pix);
1412
1413         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1414                 return -EINVAL;
1415
1416         memcpy(&rect, &(s->_rect), sizeof(rect));
1417
1418         if (!s->set_crop) {
1419                 pix->width = rect.width;
1420                 pix->height = rect.height;
1421         } else {
1422                 rect.width = pix->width;
1423                 rect.height = pix->height;
1424         }
1425
1426         if (rect.width < 8)
1427                 rect.width = 8;
1428         if (rect.height < 8)
1429                 rect.height = 8;
1430         if (rect.width > bounds->left + bounds->width - rect.left)
1431                 rect.width = bounds->left + bounds->width - rect.left;
1432         if (rect.height > bounds->top + bounds->height - rect.top)
1433                 rect.height = bounds->top + bounds->height - rect.top;
1434         rect.width &= ~7L;
1435         rect.height &= ~7L;
1436
1437         pix->width = rect.width;
1438         pix->height = rect.height;
1439         pix->pixelformat = pfmt->pixelformat;
1440         pix->priv = pfmt->priv;
1441         pix->colorspace = pfmt->colorspace;
1442         pix->bytesperline = 0;
1443         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1444         pix->field = V4L2_FIELD_NONE;
1445
1446         if (cmd == VIDIOC_TRY_FMT) {
1447                 if (copy_to_user(arg, &format, sizeof(format)))
1448                         return -EFAULT;
1449                 return 0;
1450         }
1451
1452         if (cam->module_param.force_munmap)
1453                 for (i = 0; i < cam->nbuffers; i++)
1454                         if (cam->frame[i].vma_use_count) {
1455                                 DBG(3, "VIDIOC_S_FMT failed. "
1456                                        "Unmap the buffers first.");
1457                                 return -EBUSY;
1458                         }
1459
1460         if (cam->stream == STREAM_ON)
1461                 if ((err = zc0301_stream_interrupt(cam)))
1462                         return err;
1463
1464         if (copy_to_user(arg, &format, sizeof(format))) {
1465                 cam->stream = stream;
1466                 return -EFAULT;
1467         }
1468
1469         if (cam->module_param.force_munmap || cam->io == IO_READ)
1470                 zc0301_release_buffers(cam);
1471
1472         if (s->set_crop)
1473                 err += s->set_crop(cam, &rect);
1474
1475         if (err) { /* atomic, no rollback in ioctl() */
1476                 cam->state |= DEV_MISCONFIGURED;
1477                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1478                        "use the camera, close and open %s again.",
1479                     video_device_node_name(cam->v4ldev));
1480                 return -EIO;
1481         }
1482
1483         memcpy(pfmt, pix, sizeof(*pix));
1484         memcpy(&(s->_rect), &rect, sizeof(rect));
1485
1486         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1487             nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) {
1488                 cam->state |= DEV_MISCONFIGURED;
1489                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
1490                        "use the camera, close and open %s again.",
1491                     video_device_node_name(cam->v4ldev));
1492                 return -ENOMEM;
1493         }
1494
1495         if (cam->io == IO_READ)
1496                 zc0301_empty_framequeues(cam);
1497         else if (cam->module_param.force_munmap)
1498                 zc0301_requeue_outqueue(cam);
1499
1500         cam->stream = stream;
1501
1502         return 0;
1503 }
1504
1505
1506 static int
1507 zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg)
1508 {
1509         if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
1510                 return -EFAULT;
1511
1512         return 0;
1513 }
1514
1515
1516 static int
1517 zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
1518 {
1519         struct v4l2_jpegcompression jc;
1520         const enum zc0301_stream_state stream = cam->stream;
1521         int err = 0;
1522
1523         if (copy_from_user(&jc, arg, sizeof(jc)))
1524                 return -EFAULT;
1525
1526         if (jc.quality != 0)
1527                 return -EINVAL;
1528
1529         if (cam->stream == STREAM_ON)
1530                 if ((err = zc0301_stream_interrupt(cam)))
1531                         return err;
1532
1533         err += zc0301_set_compression(cam, &jc);
1534         if (err) { /* atomic, no rollback in ioctl() */
1535                 cam->state |= DEV_MISCONFIGURED;
1536                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
1537                        "problems. To use the camera, close and open %s again.",
1538                        video_device_node_name(cam->v4ldev));
1539                 return -EIO;
1540         }
1541
1542         cam->compression.quality = jc.quality;
1543
1544         cam->stream = stream;
1545
1546         return 0;
1547 }
1548
1549
1550 static int
1551 zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
1552 {
1553         struct v4l2_requestbuffers rb;
1554         u32 i;
1555         int err;
1556
1557         if (copy_from_user(&rb, arg, sizeof(rb)))
1558                 return -EFAULT;
1559
1560         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1561             rb.memory != V4L2_MEMORY_MMAP)
1562                 return -EINVAL;
1563
1564         if (cam->io == IO_READ) {
1565                 DBG(3, "Close and open the device again to choose the mmap "
1566                        "I/O method");
1567                 return -EBUSY;
1568         }
1569
1570         for (i = 0; i < cam->nbuffers; i++)
1571                 if (cam->frame[i].vma_use_count) {
1572                         DBG(3, "VIDIOC_REQBUFS failed. "
1573                                "Previous buffers are still mapped.");
1574                         return -EBUSY;
1575                 }
1576
1577         if (cam->stream == STREAM_ON)
1578                 if ((err = zc0301_stream_interrupt(cam)))
1579                         return err;
1580
1581         zc0301_empty_framequeues(cam);
1582
1583         zc0301_release_buffers(cam);
1584         if (rb.count)
1585                 rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP);
1586
1587         if (copy_to_user(arg, &rb, sizeof(rb))) {
1588                 zc0301_release_buffers(cam);
1589                 cam->io = IO_NONE;
1590                 return -EFAULT;
1591         }
1592
1593         cam->io = rb.count ? IO_MMAP : IO_NONE;
1594
1595         return 0;
1596 }
1597
1598
1599 static int
1600 zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg)
1601 {
1602         struct v4l2_buffer b;
1603
1604         if (copy_from_user(&b, arg, sizeof(b)))
1605                 return -EFAULT;
1606
1607         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1608             b.index >= cam->nbuffers || cam->io != IO_MMAP)
1609                 return -EINVAL;
1610
1611         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
1612
1613         if (cam->frame[b.index].vma_use_count)
1614                 b.flags |= V4L2_BUF_FLAG_MAPPED;
1615
1616         if (cam->frame[b.index].state == F_DONE)
1617                 b.flags |= V4L2_BUF_FLAG_DONE;
1618         else if (cam->frame[b.index].state != F_UNUSED)
1619                 b.flags |= V4L2_BUF_FLAG_QUEUED;
1620
1621         if (copy_to_user(arg, &b, sizeof(b)))
1622                 return -EFAULT;
1623
1624         return 0;
1625 }
1626
1627
1628 static int
1629 zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg)
1630 {
1631         struct v4l2_buffer b;
1632         unsigned long lock_flags;
1633
1634         if (copy_from_user(&b, arg, sizeof(b)))
1635                 return -EFAULT;
1636
1637         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1638             b.index >= cam->nbuffers || cam->io != IO_MMAP)
1639                 return -EINVAL;
1640
1641         if (cam->frame[b.index].state != F_UNUSED)
1642                 return -EINVAL;
1643
1644         cam->frame[b.index].state = F_QUEUED;
1645
1646         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1647         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
1648         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1649
1650         PDBGG("Frame #%lu queued", (unsigned long)b.index);
1651
1652         return 0;
1653 }
1654
1655
1656 static int
1657 zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp,
1658                     void __user * arg)
1659 {
1660         struct v4l2_buffer b;
1661         struct zc0301_frame_t *f;
1662         unsigned long lock_flags;
1663         long timeout;
1664
1665         if (copy_from_user(&b, arg, sizeof(b)))
1666                 return -EFAULT;
1667
1668         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
1669                 return -EINVAL;
1670
1671         if (list_empty(&cam->outqueue)) {
1672                 if (cam->stream == STREAM_OFF)
1673                         return -EINVAL;
1674                 if (filp->f_flags & O_NONBLOCK)
1675                         return -EAGAIN;
1676                 timeout = wait_event_interruptible_timeout
1677                           ( cam->wait_frame,
1678                             (!list_empty(&cam->outqueue)) ||
1679                             (cam->state & DEV_DISCONNECTED) ||
1680                             (cam->state & DEV_MISCONFIGURED),
1681                             cam->module_param.frame_timeout *
1682                             1000 * msecs_to_jiffies(1) );
1683                 if (timeout < 0)
1684                         return timeout;
1685                 if (cam->state & DEV_DISCONNECTED)
1686                         return -ENODEV;
1687                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
1688                         return -EIO;
1689         }
1690
1691         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1692         f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame);
1693         list_del(cam->outqueue.next);
1694         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1695
1696         f->state = F_UNUSED;
1697
1698         memcpy(&b, &f->buf, sizeof(b));
1699         if (f->vma_use_count)
1700                 b.flags |= V4L2_BUF_FLAG_MAPPED;
1701
1702         if (copy_to_user(arg, &b, sizeof(b)))
1703                 return -EFAULT;
1704
1705         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
1706
1707         return 0;
1708 }
1709
1710
1711 static int
1712 zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
1713 {
1714         int type;
1715
1716         if (copy_from_user(&type, arg, sizeof(type)))
1717                 return -EFAULT;
1718
1719         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1720                 return -EINVAL;
1721
1722         cam->stream = STREAM_ON;
1723
1724         DBG(3, "Stream on");
1725
1726         return 0;
1727 }
1728
1729
1730 static int
1731 zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg)
1732 {
1733         int type, err;
1734
1735         if (copy_from_user(&type, arg, sizeof(type)))
1736                 return -EFAULT;
1737
1738         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
1739                 return -EINVAL;
1740
1741         if (cam->stream == STREAM_ON)
1742                 if ((err = zc0301_stream_interrupt(cam)))
1743                         return err;
1744
1745         zc0301_empty_framequeues(cam);
1746
1747         DBG(3, "Stream off");
1748
1749         return 0;
1750 }
1751
1752
1753 static int
1754 zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg)
1755 {
1756         struct v4l2_streamparm sp;
1757
1758         if (copy_from_user(&sp, arg, sizeof(sp)))
1759                 return -EFAULT;
1760
1761         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1762                 return -EINVAL;
1763
1764         sp.parm.capture.extendedmode = 0;
1765         sp.parm.capture.readbuffers = cam->nreadbuffers;
1766
1767         if (copy_to_user(arg, &sp, sizeof(sp)))
1768                 return -EFAULT;
1769
1770         return 0;
1771 }
1772
1773
1774 static int
1775 zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg)
1776 {
1777         struct v4l2_streamparm sp;
1778
1779         if (copy_from_user(&sp, arg, sizeof(sp)))
1780                 return -EFAULT;
1781
1782         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1783                 return -EINVAL;
1784
1785         sp.parm.capture.extendedmode = 0;
1786
1787         if (sp.parm.capture.readbuffers == 0)
1788                 sp.parm.capture.readbuffers = cam->nreadbuffers;
1789
1790         if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES)
1791                 sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES;
1792
1793         if (copy_to_user(arg, &sp, sizeof(sp)))
1794                 return -EFAULT;
1795
1796         cam->nreadbuffers = sp.parm.capture.readbuffers;
1797
1798         return 0;
1799 }
1800
1801
1802 static long zc0301_ioctl_v4l2(struct file *filp,
1803                              unsigned int cmd, void __user *arg)
1804 {
1805         struct zc0301_device *cam = video_drvdata(filp);
1806
1807         switch (cmd) {
1808
1809         case VIDIOC_QUERYCAP:
1810                 return zc0301_vidioc_querycap(cam, arg);
1811
1812         case VIDIOC_ENUMINPUT:
1813                 return zc0301_vidioc_enuminput(cam, arg);
1814
1815         case VIDIOC_G_INPUT:
1816                 return zc0301_vidioc_g_input(cam, arg);
1817
1818         case VIDIOC_S_INPUT:
1819                 return zc0301_vidioc_s_input(cam, arg);
1820
1821         case VIDIOC_QUERYCTRL:
1822                 return zc0301_vidioc_query_ctrl(cam, arg);
1823
1824         case VIDIOC_G_CTRL:
1825                 return zc0301_vidioc_g_ctrl(cam, arg);
1826
1827         case VIDIOC_S_CTRL:
1828                 return zc0301_vidioc_s_ctrl(cam, arg);
1829
1830         case VIDIOC_CROPCAP:
1831                 return zc0301_vidioc_cropcap(cam, arg);
1832
1833         case VIDIOC_G_CROP:
1834                 return zc0301_vidioc_g_crop(cam, arg);
1835
1836         case VIDIOC_S_CROP:
1837                 return zc0301_vidioc_s_crop(cam, arg);
1838
1839         case VIDIOC_ENUM_FMT:
1840                 return zc0301_vidioc_enum_fmt(cam, arg);
1841
1842         case VIDIOC_G_FMT:
1843                 return zc0301_vidioc_g_fmt(cam, arg);
1844
1845         case VIDIOC_TRY_FMT:
1846         case VIDIOC_S_FMT:
1847                 return zc0301_vidioc_try_s_fmt(cam, cmd, arg);
1848
1849         case VIDIOC_ENUM_FRAMESIZES:
1850                 return zc0301_vidioc_enum_framesizes(cam, arg);
1851
1852         case VIDIOC_G_JPEGCOMP:
1853                 return zc0301_vidioc_g_jpegcomp(cam, arg);
1854
1855         case VIDIOC_S_JPEGCOMP:
1856                 return zc0301_vidioc_s_jpegcomp(cam, arg);
1857
1858         case VIDIOC_REQBUFS:
1859                 return zc0301_vidioc_reqbufs(cam, arg);
1860
1861         case VIDIOC_QUERYBUF:
1862                 return zc0301_vidioc_querybuf(cam, arg);
1863
1864         case VIDIOC_QBUF:
1865                 return zc0301_vidioc_qbuf(cam, arg);
1866
1867         case VIDIOC_DQBUF:
1868                 return zc0301_vidioc_dqbuf(cam, filp, arg);
1869
1870         case VIDIOC_STREAMON:
1871                 return zc0301_vidioc_streamon(cam, arg);
1872
1873         case VIDIOC_STREAMOFF:
1874                 return zc0301_vidioc_streamoff(cam, arg);
1875
1876         case VIDIOC_G_PARM:
1877                 return zc0301_vidioc_g_parm(cam, arg);
1878
1879         case VIDIOC_S_PARM:
1880                 return zc0301_vidioc_s_parm(cam, arg);
1881
1882         case VIDIOC_G_STD:
1883         case VIDIOC_S_STD:
1884         case VIDIOC_QUERYSTD:
1885         case VIDIOC_ENUMSTD:
1886         case VIDIOC_QUERYMENU:
1887         case VIDIOC_ENUM_FRAMEINTERVALS:
1888                 return -EINVAL;
1889
1890         default:
1891                 return -EINVAL;
1892
1893         }
1894 }
1895
1896
1897 static long zc0301_ioctl(struct file *filp,
1898                         unsigned int cmd, unsigned long arg)
1899 {
1900         struct zc0301_device *cam = video_drvdata(filp);
1901         int err = 0;
1902
1903         if (mutex_lock_interruptible(&cam->fileop_mutex))
1904                 return -ERESTARTSYS;
1905
1906         if (cam->state & DEV_DISCONNECTED) {
1907                 DBG(1, "Device not present");
1908                 mutex_unlock(&cam->fileop_mutex);
1909                 return -ENODEV;
1910         }
1911
1912         if (cam->state & DEV_MISCONFIGURED) {
1913                 DBG(1, "The camera is misconfigured. Close and open it "
1914                        "again.");
1915                 mutex_unlock(&cam->fileop_mutex);
1916                 return -EIO;
1917         }
1918
1919         V4LDBG(3, "zc0301", cmd);
1920
1921         err = zc0301_ioctl_v4l2(filp, cmd, (void __user *)arg);
1922
1923         mutex_unlock(&cam->fileop_mutex);
1924
1925         return err;
1926 }
1927
1928
1929 static const struct v4l2_file_operations zc0301_fops = {
1930         .owner =   THIS_MODULE,
1931         .open =    zc0301_open,
1932         .release = zc0301_release,
1933         .ioctl =   zc0301_ioctl,
1934         .read =    zc0301_read,
1935         .poll =    zc0301_poll,
1936         .mmap =    zc0301_mmap,
1937 };
1938
1939 /*****************************************************************************/
1940
1941 static int
1942 zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
1943 {
1944         struct usb_device *udev = interface_to_usbdev(intf);
1945         struct zc0301_device* cam;
1946         static unsigned int dev_nr;
1947         unsigned int i;
1948         int err = 0;
1949
1950         if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL)))
1951                 return -ENOMEM;
1952
1953         cam->usbdev = udev;
1954
1955         if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) {
1956                 DBG(1, "kmalloc() failed");
1957                 err = -ENOMEM;
1958                 goto fail;
1959         }
1960
1961         if (!(cam->v4ldev = video_device_alloc())) {
1962                 DBG(1, "video_device_alloc() failed");
1963                 err = -ENOMEM;
1964                 goto fail;
1965         }
1966
1967         DBG(2, "ZC0301[P] Image Processor and Control Chip detected "
1968                "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
1969
1970         for  (i = 0; zc0301_sensor_table[i]; i++) {
1971                 err = zc0301_sensor_table[i](cam);
1972                 if (!err)
1973                         break;
1974         }
1975
1976         if (!err)
1977                 DBG(2, "%s image sensor detected", cam->sensor.name);
1978         else {
1979                 DBG(1, "No supported image sensor detected");
1980                 err = -ENODEV;
1981                 goto fail;
1982         }
1983
1984         if (zc0301_init(cam)) {
1985                 DBG(1, "Initialization failed. I will retry on open().");
1986                 cam->state |= DEV_MISCONFIGURED;
1987         }
1988
1989         strcpy(cam->v4ldev->name, "ZC0301[P] PC Camera");
1990         cam->v4ldev->fops = &zc0301_fops;
1991         cam->v4ldev->release = video_device_release;
1992         cam->v4ldev->parent = &udev->dev;
1993         video_set_drvdata(cam->v4ldev, cam);
1994
1995         init_completion(&cam->probe);
1996
1997         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
1998                                     video_nr[dev_nr]);
1999         if (err) {
2000                 DBG(1, "V4L2 device registration failed");
2001                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2002                         DBG(1, "Free /dev/videoX node not found");
2003                 video_nr[dev_nr] = -1;
2004                 dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2005                 complete_all(&cam->probe);
2006                 goto fail;
2007         }
2008
2009         DBG(2, "V4L2 device registered as %s",
2010             video_device_node_name(cam->v4ldev));
2011
2012         cam->module_param.force_munmap = force_munmap[dev_nr];
2013         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2014
2015         dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
2016
2017         usb_set_intfdata(intf, cam);
2018         kref_init(&cam->kref);
2019         usb_get_dev(cam->usbdev);
2020
2021         complete_all(&cam->probe);
2022
2023         return 0;
2024
2025 fail:
2026         if (cam) {
2027                 kfree(cam->control_buffer);
2028                 if (cam->v4ldev)
2029                         video_device_release(cam->v4ldev);
2030                 kfree(cam);
2031         }
2032         return err;
2033 }
2034
2035
2036 static void zc0301_usb_disconnect(struct usb_interface* intf)
2037 {
2038         struct zc0301_device* cam;
2039
2040         down_write(&zc0301_dev_lock);
2041
2042         cam = usb_get_intfdata(intf);
2043
2044         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2045
2046         if (cam->users) {
2047                 DBG(2, "Device %s is open! Deregistration and "
2048                        "memory deallocation are deferred.",
2049                     video_device_node_name(cam->v4ldev));
2050                 cam->state |= DEV_MISCONFIGURED;
2051                 zc0301_stop_transfer(cam);
2052                 cam->state |= DEV_DISCONNECTED;
2053                 wake_up_interruptible(&cam->wait_frame);
2054                 wake_up(&cam->wait_stream);
2055         } else
2056                 cam->state |= DEV_DISCONNECTED;
2057
2058         wake_up_interruptible_all(&cam->wait_open);
2059
2060         kref_put(&cam->kref, zc0301_release_resources);
2061
2062         up_write(&zc0301_dev_lock);
2063 }
2064
2065
2066 static struct usb_driver zc0301_usb_driver = {
2067         .name =       "zc0301",
2068         .id_table =   zc0301_id_table,
2069         .probe =      zc0301_usb_probe,
2070         .disconnect = zc0301_usb_disconnect,
2071 };
2072
2073 /*****************************************************************************/
2074
2075 static int __init zc0301_module_init(void)
2076 {
2077         int err = 0;
2078
2079         KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION);
2080         KDBG(3, ZC0301_MODULE_AUTHOR);
2081
2082         if ((err = usb_register(&zc0301_usb_driver)))
2083                 KDBG(1, "usb_register() failed");
2084
2085         return err;
2086 }
2087
2088
2089 static void __exit zc0301_module_exit(void)
2090 {
2091         usb_deregister(&zc0301_usb_driver);
2092 }
2093
2094
2095 module_init(zc0301_module_init);
2096 module_exit(zc0301_module_exit);