git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/sn9c102/sn9c102_core.c

   1 /***************************************************************************
   2  * V4L2 driver for SN9C10x PC Camera Controllers                           *
   3  *                                                                         *
   4  * Copyright (C) 2004-2006 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 "sn9c102.h"
  43
  44 /*****************************************************************************/
  45
  46 #define SN9C102_MODULE_NAME     "V4L2 driver for SN9C10x PC Camera Controllers"
  47 #define SN9C102_MODULE_AUTHOR   "(C) 2004-2006 Luca Risolia"
  48 #define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
  49 #define SN9C102_MODULE_LICENSE  "GPL"
  50 #define SN9C102_MODULE_VERSION  "1:1.27"
  51 #define SN9C102_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 27)
  52
  53 /*****************************************************************************/
  54
  55 MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
  56
  57 MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
  58 MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
  59 MODULE_VERSION(SN9C102_MODULE_VERSION);
  60 MODULE_LICENSE(SN9C102_MODULE_LICENSE);
  61
  62 static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
  63 module_param_array(video_nr, short, NULL, 0444);
  64 MODULE_PARM_DESC(video_nr,
  65                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  66                  "\n -1 = use next available (default)"
  67                  "\n  n = use minor number n (integer >= 0)"
  68                  "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
  69                  " cameras this way."
  70                  "\nFor example:"
  71                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  72                  "\nthe second camera and use auto for the first"
  73                  "\none and for every other camera."
  74                  "\n");
  75
  76 static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  77                                SN9C102_FORCE_MUNMAP};
  78 module_param_array(force_munmap, bool, NULL, 0444);
  79 MODULE_PARM_DESC(force_munmap,
  80                  "\n<0|1[,...]> Force the application to unmap previously"
  81                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  82                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  83                  "\nthis feature. This parameter is specific for each"
  84                  "\ndetected camera."
  85                  "\n 0 = do not force memory unmapping"
  86                  "\n 1 = force memory unmapping (save memory)"
  87                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
  88                  "\n");
  89
  90 static unsigned int frame_timeout[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  91                                        SN9C102_FRAME_TIMEOUT};
  92 module_param_array(frame_timeout, uint, NULL, 0644);
  93 MODULE_PARM_DESC(frame_timeout,
  94                  "\n<n[,...]> Timeout for a video frame in seconds."
  95                  "\nThis parameter is specific for each detected camera."
  96                  "\nDefault value is "__MODULE_STRING(SN9C102_FRAME_TIMEOUT)"."
  97                  "\n");
  98
  99 #ifdef SN9C102_DEBUG
 100 static unsigned short debug = SN9C102_DEBUG_LEVEL;
 101 module_param(debug, ushort, 0644);
 102 MODULE_PARM_DESC(debug,
 103                  "\n<n> Debugging information level, from 0 to 3:"
 104                  "\n0 = none (use carefully)"
 105                  "\n1 = critical errors"
 106                  "\n2 = significant informations"
 107                  "\n3 = more verbose messages"
 108                  "\nLevel 3 is useful for testing only, when only "
 109                  "one device is used."
 110                  "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
 111                  "\n");
 112 #endif
 113
 114 /*****************************************************************************/
 115
 116 static sn9c102_sof_header_t sn9c102_sof_header[] = {
 117         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x00},
 118         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x01},
 119 };
 120
 121 static sn9c103_sof_header_t sn9c103_sof_header[] = {
 122         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x20},
 123 };
 124
 125 static sn9c102_eof_header_t sn9c102_eof_header[] = {
 126         {0x00, 0x00, 0x00, 0x00},
 127         {0x40, 0x00, 0x00, 0x00},
 128         {0x80, 0x00, 0x00, 0x00},
 129         {0xc0, 0x00, 0x00, 0x00},
 130 };
 131
 132 /*****************************************************************************/
 133
 134 static u32
 135 sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
 136                         enum sn9c102_io_method io)
 137 {
 138         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 139         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 140         const size_t imagesize = cam->module_param.force_munmap ||
 141                                  io == IO_READ ?
 142                                  (p->width * p->height * p->priv) / 8 :
 143                                  (r->width * r->height * p->priv) / 8;
 144         void* buff = NULL;
 145         u32 i;
 146
 147         if (count > SN9C102_MAX_FRAMES)
 148                 count = SN9C102_MAX_FRAMES;
 149
 150         cam->nbuffers = count;
 151         while (cam->nbuffers > 0) {
 152                 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
 153                         break;
 154                 cam->nbuffers--;
 155         }
 156
 157         for (i = 0; i < cam->nbuffers; i++) {
 158                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 159                 cam->frame[i].buf.index = i;
 160                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 161                 cam->frame[i].buf.length = imagesize;
 162                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 163                 cam->frame[i].buf.sequence = 0;
 164                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 165                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 166                 cam->frame[i].buf.flags = 0;
 167         }
 168
 169         return cam->nbuffers;
 170 }
 171
 172
 173 static void sn9c102_release_buffers(struct sn9c102_device* cam)
 174 {
 175         if (cam->nbuffers) {
 176                 vfree(cam->frame[0].bufmem);
 177                 cam->nbuffers = 0;
 178         }
 179         cam->frame_current = NULL;
 180 }
 181
 182
 183 static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
 184 {
 185         u32 i;
 186
 187         INIT_LIST_HEAD(&cam->inqueue);
 188         INIT_LIST_HEAD(&cam->outqueue);
 189
 190         for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
 191                 cam->frame[i].state = F_UNUSED;
 192                 cam->frame[i].buf.bytesused = 0;
 193         }
 194 }
 195
 196
 197 static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
 198 {
 199         struct sn9c102_frame_t *i;
 200
 201         list_for_each_entry(i, &cam->outqueue, frame) {
 202                 i->state = F_QUEUED;
 203                 list_add(&i->frame, &cam->inqueue);
 204         }
 205
 206         INIT_LIST_HEAD(&cam->outqueue);
 207 }
 208
 209
 210 static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
 211 {
 212         unsigned long lock_flags;
 213         u32 i;
 214
 215         for (i = 0; i < cam->nbuffers; i++)
 216                 if (cam->frame[i].state == F_UNUSED) {
 217                         cam->frame[i].state = F_QUEUED;
 218                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 219                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 220                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 221                 }
 222 }
 223
 224 /*****************************************************************************/
 225
 226 int sn9c102_write_regs(struct sn9c102_device* cam, u8* buff, u16 index)
 227 {
 228         struct usb_device* udev = cam->usbdev;
 229         int i, res;
 230
 231         if (index + sizeof(buff) >= ARRAY_SIZE(cam->reg))
 232                 return -1;
 233
 234         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 235                               index, 0, buff, sizeof(buff),
 236                               SN9C102_CTRL_TIMEOUT*sizeof(buff));
 237         if (res < 0) {
 238                 DBG(3, "Failed to write registers (index 0x%02X, error %d)",
 239                     index, res);
 240                 return -1;
 241         }
 242
 243         for (i = 0; i < sizeof(buff); i++)
 244                 cam->reg[index+i] = buff[i];
 245
 246         return 0;
 247 }
 248
 249
 250 int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
 251 {
 252         struct usb_device* udev = cam->usbdev;
 253         u8* buff = cam->control_buffer;
 254         int res;
 255
 256         if (index >= ARRAY_SIZE(cam->reg))
 257                 return -1;
 258
 259         *buff = value;
 260
 261         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 262                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 263         if (res < 0) {
 264                 DBG(3, "Failed to write a register (value 0x%02X, index "
 265                        "0x%02X, error %d)", value, index, res);
 266                 return -1;
 267         }
 268
 269         cam->reg[index] = value;
 270
 271         return 0;
 272 }
 273
 274
 275 /* NOTE: reading some registers always returns 0 */
 276 static int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
 277 {
 278         struct usb_device* udev = cam->usbdev;
 279         u8* buff = cam->control_buffer;
 280         int res;
 281
 282         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 283                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 284         if (res < 0)
 285                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 286                     index, res);
 287
 288         return (res >= 0) ? (int)(*buff) : -1;
 289 }
 290
 291
 292 int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
 293 {
 294         if (index >= ARRAY_SIZE(cam->reg))
 295                 return -1;
 296
 297         return cam->reg[index];
 298 }
 299
 300
 301 static int
 302 sn9c102_i2c_wait(struct sn9c102_device* cam, struct sn9c102_sensor* sensor)
 303 {
 304         int i, r;
 305
 306         for (i = 1; i <= 5; i++) {
 307                 r = sn9c102_read_reg(cam, 0x08);
 308                 if (r < 0)
 309                         return -EIO;
 310                 if (r & 0x04)
 311                         return 0;
 312                 if (sensor->frequency & SN9C102_I2C_400KHZ)
 313                         udelay(5*16);
 314                 else
 315                         udelay(16*16);
 316         }
 317         return -EBUSY;
 318 }
 319
 320
 321 static int
 322 sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
 323                               struct sn9c102_sensor* sensor)
 324 {
 325         int r;
 326         r = sn9c102_read_reg(cam, 0x08);
 327         return (r < 0 || (r >= 0 && !(r & 0x08))) ? -EIO : 0;
 328 }
 329
 330
 331 static int
 332 sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
 333                                struct sn9c102_sensor* sensor)
 334 {
 335         int r;
 336         r = sn9c102_read_reg(cam, 0x08);
 337         return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
 338 }
 339
 340
 341 int
 342 sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
 343                          struct sn9c102_sensor* sensor, u8 data0, u8 data1,
 344                          u8 n, u8 buffer[])
 345 {
 346         struct usb_device* udev = cam->usbdev;
 347         u8* data = cam->control_buffer;
 348         int err = 0, res;
 349
 350         /* Write cycle */
 351         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 352                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
 353         data[1] = data0; /* I2C slave id */
 354         data[2] = data1; /* address */
 355         data[7] = 0x10;
 356         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 357                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 358         if (res < 0)
 359                 err += res;
 360
 361         err += sn9c102_i2c_wait(cam, sensor);
 362
 363         /* Read cycle - n bytes */
 364         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 365                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
 366                   (n << 4) | 0x02;
 367         data[1] = data0;
 368         data[7] = 0x10;
 369         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 370                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 371         if (res < 0)
 372                 err += res;
 373
 374         err += sn9c102_i2c_wait(cam, sensor);
 375
 376         /* The first read byte will be placed in data[4] */
 377         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 378                               0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
 379         if (res < 0)
 380                 err += res;
 381
 382         err += sn9c102_i2c_detect_read_error(cam, sensor);
 383
 384         PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
 385               data[4]);
 386
 387         if (err) {
 388                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 389                 return -1;
 390         }
 391
 392         if (buffer)
 393                 memcpy(buffer, data, sizeof(buffer));
 394
 395         return (int)data[4];
 396 }
 397
 398
 399 int
 400 sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
 401                           struct sn9c102_sensor* sensor, u8 n, u8 data0,
 402                           u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
 403 {
 404         struct usb_device* udev = cam->usbdev;
 405         u8* data = cam->control_buffer;
 406         int err = 0, res;
 407
 408         /* Write cycle. It usually is address + value */
 409         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 410                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
 411                   | ((n - 1) << 4);
 412         data[1] = data0;
 413         data[2] = data1;
 414         data[3] = data2;
 415         data[4] = data3;
 416         data[5] = data4;
 417         data[6] = data5;
 418         data[7] = 0x14;
 419         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 420                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 421         if (res < 0)
 422                 err += res;
 423
 424         err += sn9c102_i2c_wait(cam, sensor);
 425         err += sn9c102_i2c_detect_write_error(cam, sensor);
 426
 427         if (err)
 428                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 429
 430         PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
 431               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
 432               n, data0, data1, data2, data3, data4, data5);
 433
 434         return err ? -1 : 0;
 435 }
 436
 437
 438 int
 439 sn9c102_i2c_try_read(struct sn9c102_device* cam,
 440                      struct sn9c102_sensor* sensor, u8 address)
 441 {
 442         return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
 443                                         address, 1, NULL);
 444 }
 445
 446
 447 int
 448 sn9c102_i2c_try_write(struct sn9c102_device* cam,
 449                       struct sn9c102_sensor* sensor, u8 address, u8 value)
 450 {
 451         return sn9c102_i2c_try_raw_write(cam, sensor, 3,
 452                                          sensor->i2c_slave_id, address,
 453                                          value, 0, 0, 0);
 454 }
 455
 456
 457 int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
 458 {
 459         return sn9c102_i2c_try_read(cam, &cam->sensor, address);
 460 }
 461
 462
 463 int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
 464 {
 465         return sn9c102_i2c_try_write(cam, &cam->sensor, address, value);
 466 }
 467
 468 /*****************************************************************************/
 469
 470 static void*
 471 sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
 472 {
 473         size_t soflen = 0, i;
 474         u8 j, n = 0;
 475
 476         switch (cam->bridge) {
 477         case BRIDGE_SN9C101:
 478         case BRIDGE_SN9C102:
 479                 soflen = sizeof(sn9c102_sof_header_t);
 480                 n = sizeof(sn9c102_sof_header) / soflen;
 481                 break;
 482         case BRIDGE_SN9C103:
 483                 soflen = sizeof(sn9c103_sof_header_t);
 484                 n = sizeof(sn9c103_sof_header) / soflen;
 485         }
 486
 487         for (i = 0; (len >= soflen) && (i <= len - soflen); i++)
 488                 for (j = 0; j < n; j++)
 489                         /* The invariable part of the header is 6 bytes long */
 490                         if ((cam->bridge != BRIDGE_SN9C103 &&
 491                             !memcmp(mem + i, sn9c102_sof_header[j], 6)) ||
 492                             (cam->bridge == BRIDGE_SN9C103 &&
 493                             !memcmp(mem + i, sn9c103_sof_header[j], 6))) {
 494                                 memcpy(cam->sof_header, mem + i, soflen);
 495                                 /* Skip the header */
 496                                 return mem + i + soflen;
 497                         }
 498
 499         return NULL;
 500 }
 501
 502
 503 static void*
 504 sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
 505 {
 506         size_t eoflen = sizeof(sn9c102_eof_header_t), i;
 507         unsigned j, n = sizeof(sn9c102_eof_header) / eoflen;
 508
 509         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
 510                 return NULL; /* EOF header does not exist in compressed data */
 511
 512         for (i = 0; (len >= eoflen) && (i <= len - eoflen); i++)
 513                 for (j = 0; j < n; j++)
 514                         if (!memcmp(mem + i, sn9c102_eof_header[j], eoflen))
 515                                 return mem + i;
 516
 517         return NULL;
 518 }
 519
 520
 521 static void sn9c102_urb_complete(struct urb *urb)
 522 {
 523         struct sn9c102_device* cam = urb->context;
 524         struct sn9c102_frame_t** f;
 525         size_t imagesize, soflen;
 526         u8 i;
 527         int err = 0;
 528
 529         if (urb->status == -ENOENT)
 530                 return;
 531
 532         f = &cam->frame_current;
 533
 534         if (cam->stream == STREAM_INTERRUPT) {
 535                 cam->stream = STREAM_OFF;
 536                 if ((*f))
 537                         (*f)->state = F_QUEUED;
 538                 DBG(3, "Stream interrupted");
 539                 wake_up(&cam->wait_stream);
 540         }
 541
 542         if (cam->state & DEV_DISCONNECTED)
 543                 return;
 544
 545         if (cam->state & DEV_MISCONFIGURED) {
 546                 wake_up_interruptible(&cam->wait_frame);
 547                 return;
 548         }
 549
 550         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 551                 goto resubmit_urb;
 552
 553         if (!(*f))
 554                 (*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
 555                                   frame);
 556
 557         imagesize = (cam->sensor.pix_format.width *
 558                      cam->sensor.pix_format.height *
 559                      cam->sensor.pix_format.priv) / 8;
 560
 561         soflen = (cam->bridge) == BRIDGE_SN9C103 ?
 562                                   sizeof(sn9c103_sof_header_t) :
 563                                   sizeof(sn9c102_sof_header_t);
 564
 565         for (i = 0; i < urb->number_of_packets; i++) {
 566                 unsigned int img, len, status;
 567                 void *pos, *sof, *eof;
 568
 569                 len = urb->iso_frame_desc[i].actual_length;
 570                 status = urb->iso_frame_desc[i].status;
 571                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 572
 573                 if (status) {
 574                         DBG(3, "Error in isochronous frame");
 575                         (*f)->state = F_ERROR;
 576                         continue;
 577                 }
 578
 579                 PDBGG("Isochrnous frame: length %u, #%u i", len, i);
 580
 581 redo:
 582                 sof = sn9c102_find_sof_header(cam, pos, len);
 583                 if (likely(!sof)) {
 584                         eof = sn9c102_find_eof_header(cam, pos, len);
 585                         if ((*f)->state == F_GRABBING) {
 586 end_of_frame:
 587                                 img = len;
 588
 589                                 if (eof)
 590                                         img = (eof > pos) ? eof - pos - 1 : 0;
 591
 592                                 if ((*f)->buf.bytesused+img > imagesize) {
 593                                         u32 b;
 594                                         b = (*f)->buf.bytesused + img -
 595                                             imagesize;
 596                                         img = imagesize - (*f)->buf.bytesused;
 597                                         DBG(3, "Expected EOF not found: "
 598                                                "video frame cut");
 599                                         if (eof)
 600                                                 DBG(3, "Exceeded limit: +%u "
 601                                                        "bytes", (unsigned)(b));
 602                                 }
 603
 604                                 memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
 605                                        img);
 606
 607                                 if ((*f)->buf.bytesused == 0)
 608                                         do_gettimeofday(&(*f)->buf.timestamp);
 609
 610                                 (*f)->buf.bytesused += img;
 611
 612                                 if ((*f)->buf.bytesused == imagesize ||
 613                                     (cam->sensor.pix_format.pixelformat ==
 614                                                 V4L2_PIX_FMT_SN9C10X && eof)) {
 615                                         u32 b;
 616                                         b = (*f)->buf.bytesused;
 617                                         (*f)->state = F_DONE;
 618                                         (*f)->buf.sequence= ++cam->frame_count;
 619                                         spin_lock(&cam->queue_lock);
 620                                         list_move_tail(&(*f)->frame,
 621                                                        &cam->outqueue);
 622                                         if (!list_empty(&cam->inqueue))
 623                                                 (*f) = list_entry(
 624                                                         cam->inqueue.next,
 625                                                         struct sn9c102_frame_t,
 626                                                         frame );
 627                                         else
 628                                                 (*f) = NULL;
 629                                         spin_unlock(&cam->queue_lock);
 630                                         memcpy(cam->sysfs.frame_header,
 631                                                cam->sof_header, soflen);
 632                                         DBG(3, "Video frame captured: %lu "
 633                                                "bytes", (unsigned long)(b));
 634
 635                                         if (!(*f))
 636                                                 goto resubmit_urb;
 637
 638                                 } else if (eof) {
 639                                         (*f)->state = F_ERROR;
 640                                         DBG(3, "Not expected EOF after %lu "
 641                                                "bytes of image data",
 642                                             (unsigned long)
 643                                             ((*f)->buf.bytesused));
 644                                 }
 645
 646                                 if (sof) /* (1) */
 647                                         goto start_of_frame;
 648
 649                         } else if (eof) {
 650                                 DBG(3, "EOF without SOF");
 651                                 continue;
 652
 653                         } else {
 654                                 PDBGG("Ignoring pointless isochronous frame");
 655                                 continue;
 656                         }
 657
 658                 } else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
 659 start_of_frame:
 660                         (*f)->state = F_GRABBING;
 661                         (*f)->buf.bytesused = 0;
 662                         len -= (sof - pos);
 663                         pos = sof;
 664                         DBG(3, "SOF detected: new video frame");
 665                         if (len)
 666                                 goto redo;
 667
 668                 } else if ((*f)->state == F_GRABBING) {
 669                         eof = sn9c102_find_eof_header(cam, pos, len);
 670                         if (eof && eof < sof)
 671                                 goto end_of_frame; /* (1) */
 672                         else {
 673                                 if (cam->sensor.pix_format.pixelformat ==
 674                                     V4L2_PIX_FMT_SN9C10X) {
 675                                         eof = sof - soflen;
 676                                         goto end_of_frame;
 677                                 } else {
 678                                         DBG(3, "SOF before expected EOF after "
 679                                                "%lu bytes of image data",
 680                                             (unsigned long)
 681                                             ((*f)->buf.bytesused));
 682                                         goto start_of_frame;
 683                                 }
 684                         }
 685                 }
 686         }
 687
 688 resubmit_urb:
 689         urb->dev = cam->usbdev;
 690         err = usb_submit_urb(urb, GFP_ATOMIC);
 691         if (err < 0 && err != -EPERM) {
 692                 cam->state |= DEV_MISCONFIGURED;
 693                 DBG(1, "usb_submit_urb() failed");
 694         }
 695
 696         wake_up_interruptible(&cam->wait_frame);
 697 }
 698
 699
 700 static int sn9c102_start_transfer(struct sn9c102_device* cam)
 701 {
 702         struct usb_device *udev = cam->usbdev;
 703         struct urb* urb;
 704         const unsigned int sn9c102_wMaxPacketSize[] = {0, 128, 256, 384, 512,
 705                                                        680, 800, 900, 1023};
 706         const unsigned int sn9c103_wMaxPacketSize[] = {0, 128, 256, 384, 512,
 707                                                        680, 800, 900, 1003};
 708         const unsigned int psz = (cam->bridge == BRIDGE_SN9C103) ?
 709                             sn9c103_wMaxPacketSize[SN9C102_ALTERNATE_SETTING] :
 710                             sn9c102_wMaxPacketSize[SN9C102_ALTERNATE_SETTING];
 711         s8 i, j;
 712         int err = 0;
 713
 714         for (i = 0; i < SN9C102_URBS; i++) {
 715                 cam->transfer_buffer[i] = kzalloc(SN9C102_ISO_PACKETS * psz,
 716                                                   GFP_KERNEL);
 717                 if (!cam->transfer_buffer[i]) {
 718                         err = -ENOMEM;
 719                         DBG(1, "Not enough memory");
 720                         goto free_buffers;
 721                 }
 722         }
 723
 724         for (i = 0; i < SN9C102_URBS; i++) {
 725                 urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
 726                 cam->urb[i] = urb;
 727                 if (!urb) {
 728                         err = -ENOMEM;
 729                         DBG(1, "usb_alloc_urb() failed");
 730                         goto free_urbs;
 731                 }
 732                 urb->dev = udev;
 733                 urb->context = cam;
 734                 urb->pipe = usb_rcvisocpipe(udev, 1);
 735                 urb->transfer_flags = URB_ISO_ASAP;
 736                 urb->number_of_packets = SN9C102_ISO_PACKETS;
 737                 urb->complete = sn9c102_urb_complete;
 738                 urb->transfer_buffer = cam->transfer_buffer[i];
 739                 urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
 740                 urb->interval = 1;
 741                 for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
 742                         urb->iso_frame_desc[j].offset = psz * j;
 743                         urb->iso_frame_desc[j].length = psz;
 744                 }
 745         }
 746
 747         /* Enable video */
 748         if (!(cam->reg[0x01] & 0x04)) {
 749                 err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
 750                 if (err) {
 751                         err = -EIO;
 752                         DBG(1, "I/O hardware error");
 753                         goto free_urbs;
 754                 }
 755         }
 756
 757         err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
 758         if (err) {
 759                 DBG(1, "usb_set_interface() failed");
 760                 goto free_urbs;
 761         }
 762
 763         cam->frame_current = NULL;
 764
 765         for (i = 0; i < SN9C102_URBS; i++) {
 766                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 767                 if (err) {
 768                         for (j = i-1; j >= 0; j--)
 769                                 usb_kill_urb(cam->urb[j]);
 770                         DBG(1, "usb_submit_urb() failed, error %d", err);
 771                         goto free_urbs;
 772                 }
 773         }
 774
 775         return 0;
 776
 777 free_urbs:
 778         for (i = 0; (i < SN9C102_URBS) &&  cam->urb[i]; i++)
 779                 usb_free_urb(cam->urb[i]);
 780
 781 free_buffers:
 782         for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
 783                 kfree(cam->transfer_buffer[i]);
 784
 785         return err;
 786 }
 787
 788
 789 static int sn9c102_stop_transfer(struct sn9c102_device* cam)
 790 {
 791         struct usb_device *udev = cam->usbdev;
 792         s8 i;
 793         int err = 0;
 794
 795         if (cam->state & DEV_DISCONNECTED)
 796                 return 0;
 797
 798         for (i = SN9C102_URBS-1; i >= 0; i--) {
 799                 usb_kill_urb(cam->urb[i]);
 800                 usb_free_urb(cam->urb[i]);
 801                 kfree(cam->transfer_buffer[i]);
 802         }
 803
 804         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 805         if (err)
 806                 DBG(3, "usb_set_interface() failed");
 807
 808         return err;
 809 }
 810
 811
 812 static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
 813 {
 814         long timeout;
 815
 816         cam->stream = STREAM_INTERRUPT;
 817         timeout = wait_event_timeout(cam->wait_stream,
 818                                      (cam->stream == STREAM_OFF) ||
 819                                      (cam->state & DEV_DISCONNECTED),
 820                                      SN9C102_URB_TIMEOUT);
 821         if (cam->state & DEV_DISCONNECTED)
 822                 return -ENODEV;
 823         else if (cam->stream != STREAM_OFF) {
 824                 cam->state |= DEV_MISCONFIGURED;
 825                 DBG(1, "URB timeout reached. The camera is misconfigured. "
 826                        "To use it, close and open /dev/video%d again.",
 827                     cam->v4ldev->minor);
 828                 return -EIO;
 829         }
 830
 831         return 0;
 832 }
 833
 834 /*****************************************************************************/
 835
 836 #ifdef CONFIG_VIDEO_ADV_DEBUG
 837 static u8 sn9c102_strtou8(const char* buff, size_t len, ssize_t* count)
 838 {
 839         char str[5];
 840         char* endp;
 841         unsigned long val;
 842
 843         if (len < 4) {
 844                 strncpy(str, buff, len);
 845                 str[len+1] = '\0';
 846         } else {
 847                 strncpy(str, buff, 4);
 848                 str[4] = '\0';
 849         }
 850
 851         val = simple_strtoul(str, &endp, 0);
 852
 853         *count = 0;
 854         if (val <= 0xff)
 855                 *count = (ssize_t)(endp - str);
 856         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 857                 *count += 1;
 858
 859         return (u8)val;
 860 }
 861
 862 /*
 863    NOTE 1: being inside one of the following methods implies that the v4l
 864            device exists for sure (see kobjects and reference counters)
 865    NOTE 2: buffers are PAGE_SIZE long
 866 */
 867
 868 static ssize_t sn9c102_show_reg(struct class_device* cd, char* buf)
 869 {
 870         struct sn9c102_device* cam;
 871         ssize_t count;
 872
 873         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
 874                 return -ERESTARTSYS;
 875
 876         cam = video_get_drvdata(to_video_device(cd));
 877         if (!cam) {
 878                 mutex_unlock(&sn9c102_sysfs_lock);
 879                 return -ENODEV;
 880         }
 881
 882         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 883
 884         mutex_unlock(&sn9c102_sysfs_lock);
 885
 886         return count;
 887 }
 888
 889
 890 static ssize_t
 891 sn9c102_store_reg(struct class_device* cd, const char* buf, size_t len)
 892 {
 893         struct sn9c102_device* cam;
 894         u8 index;
 895         ssize_t count;
 896
 897         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
 898                 return -ERESTARTSYS;
 899
 900         cam = video_get_drvdata(to_video_device(cd));
 901         if (!cam) {
 902                 mutex_unlock(&sn9c102_sysfs_lock);
 903                 return -ENODEV;
 904         }
 905
 906         index = sn9c102_strtou8(buf, len, &count);
 907         if (index > 0x1f || !count) {
 908                 mutex_unlock(&sn9c102_sysfs_lock);
 909                 return -EINVAL;
 910         }
 911
 912         cam->sysfs.reg = index;
 913
 914         DBG(2, "Moved SN9C10X register index to 0x%02X", cam->sysfs.reg);
 915         DBG(3, "Written bytes: %zd", count);
 916
 917         mutex_unlock(&sn9c102_sysfs_lock);
 918
 919         return count;
 920 }
 921
 922
 923 static ssize_t sn9c102_show_val(struct class_device* cd, char* buf)
 924 {
 925         struct sn9c102_device* cam;
 926         ssize_t count;
 927         int val;
 928
 929         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
 930                 return -ERESTARTSYS;
 931
 932         cam = video_get_drvdata(to_video_device(cd));
 933         if (!cam) {
 934                 mutex_unlock(&sn9c102_sysfs_lock);
 935                 return -ENODEV;
 936         }
 937
 938         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
 939                 mutex_unlock(&sn9c102_sysfs_lock);
 940                 return -EIO;
 941         }
 942
 943         count = sprintf(buf, "%d\n", val);
 944
 945         DBG(3, "Read bytes: %zd", count);
 946
 947         mutex_unlock(&sn9c102_sysfs_lock);
 948
 949         return count;
 950 }
 951
 952
 953 static ssize_t
 954 sn9c102_store_val(struct class_device* cd, const char* buf, size_t len)
 955 {
 956         struct sn9c102_device* cam;
 957         u8 value;
 958         ssize_t count;
 959         int err;
 960
 961         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
 962                 return -ERESTARTSYS;
 963
 964         cam = video_get_drvdata(to_video_device(cd));
 965         if (!cam) {
 966                 mutex_unlock(&sn9c102_sysfs_lock);
 967                 return -ENODEV;
 968         }
 969
 970         value = sn9c102_strtou8(buf, len, &count);
 971         if (!count) {
 972                 mutex_unlock(&sn9c102_sysfs_lock);
 973                 return -EINVAL;
 974         }
 975
 976         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
 977         if (err) {
 978                 mutex_unlock(&sn9c102_sysfs_lock);
 979                 return -EIO;
 980         }
 981
 982         DBG(2, "Written SN9C10X reg. 0x%02X, val. 0x%02X",
 983             cam->sysfs.reg, value);
 984         DBG(3, "Written bytes: %zd", count);
 985
 986         mutex_unlock(&sn9c102_sysfs_lock);
 987
 988         return count;
 989 }
 990
 991
 992 static ssize_t sn9c102_show_i2c_reg(struct class_device* cd, char* buf)
 993 {
 994         struct sn9c102_device* cam;
 995         ssize_t count;
 996
 997         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
 998                 return -ERESTARTSYS;
 999
1000         cam = video_get_drvdata(to_video_device(cd));
1001         if (!cam) {
1002                 mutex_unlock(&sn9c102_sysfs_lock);
1003                 return -ENODEV;
1004         }
1005
1006         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1007
1008         DBG(3, "Read bytes: %zd", count);
1009
1010         mutex_unlock(&sn9c102_sysfs_lock);
1011
1012         return count;
1013 }
1014
1015
1016 static ssize_t
1017 sn9c102_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
1018 {
1019         struct sn9c102_device* cam;
1020         u8 index;
1021         ssize_t count;
1022
1023         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1024                 return -ERESTARTSYS;
1025
1026         cam = video_get_drvdata(to_video_device(cd));
1027         if (!cam) {
1028                 mutex_unlock(&sn9c102_sysfs_lock);
1029                 return -ENODEV;
1030         }
1031
1032         index = sn9c102_strtou8(buf, len, &count);
1033         if (!count) {
1034                 mutex_unlock(&sn9c102_sysfs_lock);
1035                 return -EINVAL;
1036         }
1037
1038         cam->sysfs.i2c_reg = index;
1039
1040         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1041         DBG(3, "Written bytes: %zd", count);
1042
1043         mutex_unlock(&sn9c102_sysfs_lock);
1044
1045         return count;
1046 }
1047
1048
1049 static ssize_t sn9c102_show_i2c_val(struct class_device* cd, char* buf)
1050 {
1051         struct sn9c102_device* cam;
1052         ssize_t count;
1053         int val;
1054
1055         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1056                 return -ERESTARTSYS;
1057
1058         cam = video_get_drvdata(to_video_device(cd));
1059         if (!cam) {
1060                 mutex_unlock(&sn9c102_sysfs_lock);
1061                 return -ENODEV;
1062         }
1063
1064         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
1065                 mutex_unlock(&sn9c102_sysfs_lock);
1066                 return -ENOSYS;
1067         }
1068
1069         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1070                 mutex_unlock(&sn9c102_sysfs_lock);
1071                 return -EIO;
1072         }
1073
1074         count = sprintf(buf, "%d\n", val);
1075
1076         DBG(3, "Read bytes: %zd", count);
1077
1078         mutex_unlock(&sn9c102_sysfs_lock);
1079
1080         return count;
1081 }
1082
1083
1084 static ssize_t
1085 sn9c102_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
1086 {
1087         struct sn9c102_device* cam;
1088         u8 value;
1089         ssize_t count;
1090         int err;
1091
1092         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1093                 return -ERESTARTSYS;
1094
1095         cam = video_get_drvdata(to_video_device(cd));
1096         if (!cam) {
1097                 mutex_unlock(&sn9c102_sysfs_lock);
1098                 return -ENODEV;
1099         }
1100
1101         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
1102                 mutex_unlock(&sn9c102_sysfs_lock);
1103                 return -ENOSYS;
1104         }
1105
1106         value = sn9c102_strtou8(buf, len, &count);
1107         if (!count) {
1108                 mutex_unlock(&sn9c102_sysfs_lock);
1109                 return -EINVAL;
1110         }
1111
1112         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1113         if (err) {
1114                 mutex_unlock(&sn9c102_sysfs_lock);
1115                 return -EIO;
1116         }
1117
1118         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1119             cam->sysfs.i2c_reg, value);
1120         DBG(3, "Written bytes: %zd", count);
1121
1122         mutex_unlock(&sn9c102_sysfs_lock);
1123
1124         return count;
1125 }
1126
1127
1128 static ssize_t
1129 sn9c102_store_green(struct class_device* cd, const char* buf, size_t len)
1130 {
1131         struct sn9c102_device* cam;
1132         enum sn9c102_bridge bridge;
1133         ssize_t res = 0;
1134         u8 value;
1135         ssize_t count;
1136
1137         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1138                 return -ERESTARTSYS;
1139
1140         cam = video_get_drvdata(to_video_device(cd));
1141         if (!cam) {
1142                 mutex_unlock(&sn9c102_sysfs_lock);
1143                 return -ENODEV;
1144         }
1145
1146         bridge = cam->bridge;
1147
1148         mutex_unlock(&sn9c102_sysfs_lock);
1149
1150         value = sn9c102_strtou8(buf, len, &count);
1151         if (!count)
1152                 return -EINVAL;
1153
1154         switch (bridge) {
1155         case BRIDGE_SN9C101:
1156         case BRIDGE_SN9C102:
1157                 if (value > 0x0f)
1158                         return -EINVAL;
1159                 if ((res = sn9c102_store_reg(cd, "0x11", 4)) >= 0)
1160                         res = sn9c102_store_val(cd, buf, len);
1161                 break;
1162         case BRIDGE_SN9C103:
1163                 if (value > 0x7f)
1164                         return -EINVAL;
1165                 if ((res = sn9c102_store_reg(cd, "0x04", 4)) >= 0)
1166                         res = sn9c102_store_val(cd, buf, len);
1167                 break;
1168         }
1169
1170         return res;
1171 }
1172
1173
1174 static ssize_t
1175 sn9c102_store_blue(struct class_device* cd, const char* buf, size_t len)
1176 {
1177         ssize_t res = 0;
1178         u8 value;
1179         ssize_t count;
1180
1181         value = sn9c102_strtou8(buf, len, &count);
1182         if (!count || value > 0x7f)
1183                 return -EINVAL;
1184
1185         if ((res = sn9c102_store_reg(cd, "0x06", 4)) >= 0)
1186                 res = sn9c102_store_val(cd, buf, len);
1187
1188         return res;
1189 }
1190
1191
1192 static ssize_t
1193 sn9c102_store_red(struct class_device* cd, const char* buf, size_t len)
1194 {
1195         ssize_t res = 0;
1196         u8 value;
1197         ssize_t count;
1198
1199         value = sn9c102_strtou8(buf, len, &count);
1200         if (!count || value > 0x7f)
1201                 return -EINVAL;
1202
1203         if ((res = sn9c102_store_reg(cd, "0x05", 4)) >= 0)
1204                 res = sn9c102_store_val(cd, buf, len);
1205
1206         return res;
1207 }
1208
1209
1210 static ssize_t sn9c102_show_frame_header(struct class_device* cd, char* buf)
1211 {
1212         struct sn9c102_device* cam;
1213         ssize_t count;
1214
1215         cam = video_get_drvdata(to_video_device(cd));
1216         if (!cam)
1217                 return -ENODEV;
1218
1219         count = sizeof(cam->sysfs.frame_header);
1220         memcpy(buf, cam->sysfs.frame_header, count);
1221
1222         DBG(3, "Frame header, read bytes: %zd", count);
1223
1224         return count;
1225 }
1226
1227
1228 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
1229                          sn9c102_show_reg, sn9c102_store_reg);
1230 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
1231                          sn9c102_show_val, sn9c102_store_val);
1232 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1233                          sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1234 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1235                          sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1236 static CLASS_DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
1237 static CLASS_DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
1238 static CLASS_DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
1239 static CLASS_DEVICE_ATTR(frame_header, S_IRUGO,
1240                          sn9c102_show_frame_header, NULL);
1241
1242
1243 static int sn9c102_create_sysfs(struct sn9c102_device* cam)
1244 {
1245         struct video_device *v4ldev = cam->v4ldev;
1246         int rc;
1247
1248         rc = video_device_create_file(v4ldev, &class_device_attr_reg);
1249         if (rc) goto err;
1250         rc = video_device_create_file(v4ldev, &class_device_attr_val);
1251         if (rc) goto err_reg;
1252         rc = video_device_create_file(v4ldev, &class_device_attr_frame_header);
1253         if (rc) goto err_val;
1254
1255         if (cam->sensor.sysfs_ops) {
1256                 rc = video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
1257                 if (rc) goto err_frhead;
1258                 rc = video_device_create_file(v4ldev, &class_device_attr_i2c_val);
1259                 if (rc) goto err_i2c_reg;
1260         }
1261
1262         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
1263                 rc = video_device_create_file(v4ldev, &class_device_attr_green);
1264                 if (rc) goto err_i2c_val;
1265         } else if (cam->bridge == BRIDGE_SN9C103) {
1266                 rc = video_device_create_file(v4ldev, &class_device_attr_blue);
1267                 if (rc) goto err_i2c_val;
1268                 rc = video_device_create_file(v4ldev, &class_device_attr_red);
1269                 if (rc) goto err_blue;
1270         }
1271
1272         return 0;
1273
1274 err_blue:
1275         video_device_remove_file(v4ldev, &class_device_attr_blue);
1276 err_i2c_val:
1277         if (cam->sensor.sysfs_ops)
1278                 video_device_remove_file(v4ldev, &class_device_attr_i2c_val);
1279 err_i2c_reg:
1280         if (cam->sensor.sysfs_ops)
1281                 video_device_remove_file(v4ldev, &class_device_attr_i2c_reg);
1282 err_frhead:
1283         video_device_remove_file(v4ldev, &class_device_attr_frame_header);
1284 err_val:
1285         video_device_remove_file(v4ldev, &class_device_attr_val);
1286 err_reg:
1287         video_device_remove_file(v4ldev, &class_device_attr_reg);
1288 err:
1289         return rc;
1290 }
1291 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1292
1293 /*****************************************************************************/
1294
1295 static int
1296 sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
1297 {
1298         int err = 0;
1299
1300         if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
1301                 err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80, 0x18);
1302         else
1303                 err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f, 0x18);
1304
1305         return err ? -EIO : 0;
1306 }
1307
1308
1309 static int
1310 sn9c102_set_compression(struct sn9c102_device* cam,
1311                         struct v4l2_jpegcompression* compression)
1312 {
1313         int err = 0;
1314
1315         if (compression->quality == 0)
1316                 err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01, 0x17);
1317         else if (compression->quality == 1)
1318                 err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe, 0x17);
1319
1320         return err ? -EIO : 0;
1321 }
1322
1323
1324 static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
1325 {
1326         u8 r = 0;
1327         int err = 0;
1328
1329         if (scale == 1)
1330                 r = cam->reg[0x18] & 0xcf;
1331         else if (scale == 2) {
1332                 r = cam->reg[0x18] & 0xcf;
1333                 r |= 0x10;
1334         } else if (scale == 4)
1335                 r = cam->reg[0x18] | 0x20;
1336
1337         err += sn9c102_write_reg(cam, r, 0x18);
1338         if (err)
1339                 return -EIO;
1340
1341         PDBGG("Scaling factor: %u", scale);
1342
1343         return 0;
1344 }
1345
1346
1347 static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
1348 {
1349         struct sn9c102_sensor* s = &cam->sensor;
1350         u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
1351            v_start = (u8)(rect->top - s->cropcap.bounds.top),
1352            h_size = (u8)(rect->width / 16),
1353            v_size = (u8)(rect->height / 16);
1354         int err = 0;
1355
1356         err += sn9c102_write_reg(cam, h_start, 0x12);
1357         err += sn9c102_write_reg(cam, v_start, 0x13);
1358         err += sn9c102_write_reg(cam, h_size, 0x15);
1359         err += sn9c102_write_reg(cam, v_size, 0x16);
1360         if (err)
1361                 return -EIO;
1362
1363         PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
1364               "%u %u %u %u", h_start, v_start, h_size, v_size);
1365
1366         return 0;
1367 }
1368
1369
1370 static int sn9c102_init(struct sn9c102_device* cam)
1371 {
1372         struct sn9c102_sensor* s = &cam->sensor;
1373         struct v4l2_control ctrl;
1374         struct v4l2_queryctrl *qctrl;
1375         struct v4l2_rect* rect;
1376         u8 i = 0;
1377         int err = 0;
1378
1379         if (!(cam->state & DEV_INITIALIZED)) {
1380                 init_waitqueue_head(&cam->open);
1381                 qctrl = s->qctrl;
1382                 rect = &(s->cropcap.defrect);
1383         } else { /* use current values */
1384                 qctrl = s->_qctrl;
1385                 rect = &(s->_rect);
1386         }
1387
1388         err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
1389         err += sn9c102_set_crop(cam, rect);
1390         if (err)
1391                 return err;
1392
1393         if (s->init) {
1394                 err = s->init(cam);
1395                 if (err) {
1396                         DBG(3, "Sensor initialization failed");
1397                         return err;
1398                 }
1399         }
1400
1401         if (!(cam->state & DEV_INITIALIZED))
1402                 cam->compression.quality =  cam->reg[0x17] & 0x01 ? 0 : 1;
1403         else
1404                 err += sn9c102_set_compression(cam, &cam->compression);
1405         err += sn9c102_set_pix_format(cam, &s->pix_format);
1406         if (s->set_pix_format)
1407                 err += s->set_pix_format(cam, &s->pix_format);
1408         if (err)
1409                 return err;
1410
1411         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
1412                 DBG(3, "Compressed video format is active, quality %d",
1413                     cam->compression.quality);
1414         else
1415                 DBG(3, "Uncompressed video format is active");
1416
1417         if (s->set_crop)
1418                 if ((err = s->set_crop(cam, rect))) {
1419                         DBG(3, "set_crop() failed");
1420                         return err;
1421                 }
1422
1423         if (s->set_ctrl) {
1424                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1425                         if (s->qctrl[i].id != 0 &&
1426                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1427                                 ctrl.id = s->qctrl[i].id;
1428                                 ctrl.value = qctrl[i].default_value;
1429                                 err = s->set_ctrl(cam, &ctrl);
1430                                 if (err) {
1431                                         DBG(3, "Set %s control failed",
1432                                             s->qctrl[i].name);
1433                                         return err;
1434                                 }
1435                                 DBG(3, "Image sensor supports '%s' control",
1436                                     s->qctrl[i].name);
1437                         }
1438         }
1439
1440         if (!(cam->state & DEV_INITIALIZED)) {
1441                 mutex_init(&cam->fileop_mutex);
1442                 spin_lock_init(&cam->queue_lock);
1443                 init_waitqueue_head(&cam->wait_frame);
1444                 init_waitqueue_head(&cam->wait_stream);
1445                 cam->nreadbuffers = 2;
1446                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1447                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1448                        sizeof(struct v4l2_rect));
1449                 cam->state |= DEV_INITIALIZED;
1450         }
1451
1452         DBG(2, "Initialization succeeded");
1453         return 0;
1454 }
1455
1456
1457 static void sn9c102_release_resources(struct sn9c102_device* cam)
1458 {
1459         mutex_lock(&sn9c102_sysfs_lock);
1460
1461         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1462         video_set_drvdata(cam->v4ldev, NULL);
1463         video_unregister_device(cam->v4ldev);
1464
1465         usb_put_dev(cam->usbdev);
1466
1467         mutex_unlock(&sn9c102_sysfs_lock);
1468
1469         kfree(cam->control_buffer);
1470 }
1471
1472 /*****************************************************************************/
1473
1474 static int sn9c102_open(struct inode* inode, struct file* filp)
1475 {
1476         struct sn9c102_device* cam;
1477         int err = 0;
1478
1479         /*
1480            This is the only safe way to prevent race conditions with
1481            disconnect
1482         */
1483         if (!down_read_trylock(&sn9c102_disconnect))
1484                 return -ERESTARTSYS;
1485
1486         cam = video_get_drvdata(video_devdata(filp));
1487
1488         if (mutex_lock_interruptible(&cam->dev_mutex)) {
1489                 up_read(&sn9c102_disconnect);
1490                 return -ERESTARTSYS;
1491         }
1492
1493         if (cam->users) {
1494                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1495                 if ((filp->f_flags & O_NONBLOCK) ||
1496                     (filp->f_flags & O_NDELAY)) {
1497                         err = -EWOULDBLOCK;
1498                         goto out;
1499                 }
1500                 mutex_unlock(&cam->dev_mutex);
1501                 err = wait_event_interruptible_exclusive(cam->open,
1502                                                   cam->state & DEV_DISCONNECTED
1503                                                          || !cam->users);
1504                 if (err) {
1505                         up_read(&sn9c102_disconnect);
1506                         return err;
1507                 }
1508                 if (cam->state & DEV_DISCONNECTED) {
1509                         up_read(&sn9c102_disconnect);
1510                         return -ENODEV;
1511                 }
1512                 mutex_lock(&cam->dev_mutex);
1513         }
1514
1515
1516         if (cam->state & DEV_MISCONFIGURED) {
1517                 err = sn9c102_init(cam);
1518                 if (err) {
1519                         DBG(1, "Initialization failed again. "
1520                                "I will retry on next open().");
1521                         goto out;
1522                 }
1523                 cam->state &= ~DEV_MISCONFIGURED;
1524         }
1525
1526         if ((err = sn9c102_start_transfer(cam)))
1527                 goto out;
1528
1529         filp->private_data = cam;
1530         cam->users++;
1531         cam->io = IO_NONE;
1532         cam->stream = STREAM_OFF;
1533         cam->nbuffers = 0;
1534         cam->frame_count = 0;
1535         sn9c102_empty_framequeues(cam);
1536
1537         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1538
1539 out:
1540         mutex_unlock(&cam->dev_mutex);
1541         up_read(&sn9c102_disconnect);
1542         return err;
1543 }
1544
1545
1546 static int sn9c102_release(struct inode* inode, struct file* filp)
1547 {
1548         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1549
1550         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
1551
1552         sn9c102_stop_transfer(cam);
1553
1554         sn9c102_release_buffers(cam);
1555
1556         if (cam->state & DEV_DISCONNECTED) {
1557                 sn9c102_release_resources(cam);
1558                 mutex_unlock(&cam->dev_mutex);
1559                 kfree(cam);
1560                 return 0;
1561         }
1562
1563         cam->users--;
1564         wake_up_interruptible_nr(&cam->open, 1);
1565
1566         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1567
1568         mutex_unlock(&cam->dev_mutex);
1569
1570         return 0;
1571 }
1572
1573
1574 static ssize_t
1575 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1576 {
1577         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1578         struct sn9c102_frame_t* f, * i;
1579         unsigned long lock_flags;
1580         long timeout;
1581         int err = 0;
1582
1583         if (mutex_lock_interruptible(&cam->fileop_mutex))
1584                 return -ERESTARTSYS;
1585
1586         if (cam->state & DEV_DISCONNECTED) {
1587                 DBG(1, "Device not present");
1588                 mutex_unlock(&cam->fileop_mutex);
1589                 return -ENODEV;
1590         }
1591
1592         if (cam->state & DEV_MISCONFIGURED) {
1593                 DBG(1, "The camera is misconfigured. Close and open it "
1594                        "again.");
1595                 mutex_unlock(&cam->fileop_mutex);
1596                 return -EIO;
1597         }
1598
1599         if (cam->io == IO_MMAP) {
1600                 DBG(3, "Close and open the device again to choose "
1601                        "the read method");
1602                 mutex_unlock(&cam->fileop_mutex);
1603                 return -EINVAL;
1604         }
1605
1606         if (cam->io == IO_NONE) {
1607                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1608                         DBG(1, "read() failed, not enough memory");
1609                         mutex_unlock(&cam->fileop_mutex);
1610                         return -ENOMEM;
1611                 }
1612                 cam->io = IO_READ;
1613                 cam->stream = STREAM_ON;
1614         }
1615
1616         if (list_empty(&cam->inqueue)) {
1617                 if (!list_empty(&cam->outqueue))
1618                         sn9c102_empty_framequeues(cam);
1619                 sn9c102_queue_unusedframes(cam);
1620         }
1621
1622         if (!count) {
1623                 mutex_unlock(&cam->fileop_mutex);
1624                 return 0;
1625         }
1626
1627         if (list_empty(&cam->outqueue)) {
1628                 if (filp->f_flags & O_NONBLOCK) {
1629                         mutex_unlock(&cam->fileop_mutex);
1630                         return -EAGAIN;
1631                 }
1632                 timeout = wait_event_interruptible_timeout
1633                           ( cam->wait_frame,
1634                             (!list_empty(&cam->outqueue)) ||
1635                             (cam->state & DEV_DISCONNECTED) ||
1636                             (cam->state & DEV_MISCONFIGURED),
1637                             cam->module_param.frame_timeout *
1638                             1000 * msecs_to_jiffies(1) );
1639                 if (timeout < 0) {
1640                         mutex_unlock(&cam->fileop_mutex);
1641                         return timeout;
1642                 }
1643                 if (cam->state & DEV_DISCONNECTED) {
1644                         mutex_unlock(&cam->fileop_mutex);
1645                         return -ENODEV;
1646                 }
1647                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1648                         mutex_unlock(&cam->fileop_mutex);
1649                         return -EIO;
1650                 }
1651         }
1652
1653         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1654
1655         if (count > f->buf.bytesused)
1656                 count = f->buf.bytesused;
1657
1658         if (copy_to_user(buf, f->bufmem, count)) {
1659                 err = -EFAULT;
1660                 goto exit;
1661         }
1662         *f_pos += count;
1663
1664 exit:
1665         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1666         list_for_each_entry(i, &cam->outqueue, frame)
1667                 i->state = F_UNUSED;
1668         INIT_LIST_HEAD(&cam->outqueue);
1669         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1670
1671         sn9c102_queue_unusedframes(cam);
1672
1673         PDBGG("Frame #%lu, bytes read: %zu",
1674               (unsigned long)f->buf.index, count);
1675
1676         mutex_unlock(&cam->fileop_mutex);
1677
1678         return count;
1679 }
1680
1681
1682 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
1683 {
1684         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1685         struct sn9c102_frame_t* f;
1686         unsigned long lock_flags;
1687         unsigned int mask = 0;
1688
1689         if (mutex_lock_interruptible(&cam->fileop_mutex))
1690                 return POLLERR;
1691
1692         if (cam->state & DEV_DISCONNECTED) {
1693                 DBG(1, "Device not present");
1694                 goto error;
1695         }
1696
1697         if (cam->state & DEV_MISCONFIGURED) {
1698                 DBG(1, "The camera is misconfigured. Close and open it "
1699                        "again.");
1700                 goto error;
1701         }
1702
1703         if (cam->io == IO_NONE) {
1704                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
1705                                              IO_READ)) {
1706                         DBG(1, "poll() failed, not enough memory");
1707                         goto error;
1708                 }
1709                 cam->io = IO_READ;
1710                 cam->stream = STREAM_ON;
1711         }
1712
1713         if (cam->io == IO_READ) {
1714                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1715                 list_for_each_entry(f, &cam->outqueue, frame)
1716                         f->state = F_UNUSED;
1717                 INIT_LIST_HEAD(&cam->outqueue);
1718                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1719                 sn9c102_queue_unusedframes(cam);
1720         }
1721
1722         poll_wait(filp, &cam->wait_frame, wait);
1723
1724         if (!list_empty(&cam->outqueue))
1725                 mask |= POLLIN | POLLRDNORM;
1726
1727         mutex_unlock(&cam->fileop_mutex);
1728
1729         return mask;
1730
1731 error:
1732         mutex_unlock(&cam->fileop_mutex);
1733         return POLLERR;
1734 }
1735
1736
1737 static void sn9c102_vm_open(struct vm_area_struct* vma)
1738 {
1739         struct sn9c102_frame_t* f = vma->vm_private_data;
1740         f->vma_use_count++;
1741 }
1742
1743
1744 static void sn9c102_vm_close(struct vm_area_struct* vma)
1745 {
1746         /* NOTE: buffers are not freed here */
1747         struct sn9c102_frame_t* f = vma->vm_private_data;
1748         f->vma_use_count--;
1749 }
1750
1751
1752 static struct vm_operations_struct sn9c102_vm_ops = {
1753         .open = sn9c102_vm_open,
1754         .close = sn9c102_vm_close,
1755 };
1756
1757
1758 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
1759 {
1760         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1761         unsigned long size = vma->vm_end - vma->vm_start,
1762                       start = vma->vm_start;
1763         void *pos;
1764         u32 i;
1765
1766         if (mutex_lock_interruptible(&cam->fileop_mutex))
1767                 return -ERESTARTSYS;
1768
1769         if (cam->state & DEV_DISCONNECTED) {
1770                 DBG(1, "Device not present");
1771                 mutex_unlock(&cam->fileop_mutex);
1772                 return -ENODEV;
1773         }
1774
1775         if (cam->state & DEV_MISCONFIGURED) {
1776                 DBG(1, "The camera is misconfigured. Close and open it "
1777                        "again.");
1778                 mutex_unlock(&cam->fileop_mutex);
1779                 return -EIO;
1780         }
1781
1782         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1783             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1784                 mutex_unlock(&cam->fileop_mutex);
1785                 return -EINVAL;
1786         }
1787
1788         for (i = 0; i < cam->nbuffers; i++) {
1789                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1790                         break;
1791         }
1792         if (i == cam->nbuffers) {
1793                 mutex_unlock(&cam->fileop_mutex);
1794                 return -EINVAL;
1795         }
1796
1797         vma->vm_flags |= VM_IO;
1798         vma->vm_flags |= VM_RESERVED;
1799
1800         pos = cam->frame[i].bufmem;
1801         while (size > 0) { /* size is page-aligned */
1802                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1803                         mutex_unlock(&cam->fileop_mutex);
1804                         return -EAGAIN;
1805                 }
1806                 start += PAGE_SIZE;
1807                 pos += PAGE_SIZE;
1808                 size -= PAGE_SIZE;
1809         }
1810
1811         vma->vm_ops = &sn9c102_vm_ops;
1812         vma->vm_private_data = &cam->frame[i];
1813
1814         sn9c102_vm_open(vma);
1815
1816         mutex_unlock(&cam->fileop_mutex);
1817
1818         return 0;
1819 }
1820
1821 /*****************************************************************************/
1822
1823 static int
1824 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
1825 {
1826         struct v4l2_capability cap = {
1827                 .driver = "sn9c102",
1828                 .version = SN9C102_MODULE_VERSION_CODE,
1829                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1830                                 V4L2_CAP_STREAMING,
1831         };
1832
1833         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1834         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1835                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1836                         sizeof(cap.bus_info));
1837
1838         if (copy_to_user(arg, &cap, sizeof(cap)))
1839                 return -EFAULT;
1840
1841         return 0;
1842 }
1843
1844
1845 static int
1846 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
1847 {
1848         struct v4l2_input i;
1849
1850         if (copy_from_user(&i, arg, sizeof(i)))
1851                 return -EFAULT;
1852
1853         if (i.index)
1854                 return -EINVAL;
1855
1856         memset(&i, 0, sizeof(i));
1857         strcpy(i.name, "Camera");
1858         i.type = V4L2_INPUT_TYPE_CAMERA;
1859
1860         if (copy_to_user(arg, &i, sizeof(i)))
1861                 return -EFAULT;
1862
1863         return 0;
1864 }
1865
1866
1867 static int
1868 sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
1869 {
1870         int index = 0;
1871
1872         if (copy_to_user(arg, &index, sizeof(index)))
1873                 return -EFAULT;
1874
1875         return 0;
1876 }
1877
1878
1879 static int
1880 sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
1881 {
1882         int index;
1883
1884         if (copy_from_user(&index, arg, sizeof(index)))
1885                 return -EFAULT;
1886
1887         if (index != 0)
1888                 return -EINVAL;
1889
1890         return 0;
1891 }
1892
1893
1894 static int
1895 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
1896 {
1897         struct sn9c102_sensor* s = &cam->sensor;
1898         struct v4l2_queryctrl qc;
1899         u8 i;
1900
1901         if (copy_from_user(&qc, arg, sizeof(qc)))
1902                 return -EFAULT;
1903
1904         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1905                 if (qc.id && qc.id == s->qctrl[i].id) {
1906                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1907                         if (copy_to_user(arg, &qc, sizeof(qc)))
1908                                 return -EFAULT;
1909                         return 0;
1910                 }
1911
1912         return -EINVAL;
1913 }
1914
1915
1916 static int
1917 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
1918 {
1919         struct sn9c102_sensor* s = &cam->sensor;
1920         struct v4l2_control ctrl;
1921         int err = 0;
1922         u8 i;
1923
1924         if (!s->get_ctrl && !s->set_ctrl)
1925                 return -EINVAL;
1926
1927         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1928                 return -EFAULT;
1929
1930         if (!s->get_ctrl) {
1931                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1932                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
1933                                 ctrl.value = s->_qctrl[i].default_value;
1934                                 goto exit;
1935                         }
1936                 return -EINVAL;
1937         } else
1938                 err = s->get_ctrl(cam, &ctrl);
1939
1940 exit:
1941         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1942                 return -EFAULT;
1943
1944         return err;
1945 }
1946
1947
1948 static int
1949 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
1950 {
1951         struct sn9c102_sensor* s = &cam->sensor;
1952         struct v4l2_control ctrl;
1953         u8 i;
1954         int err = 0;
1955
1956         if (!s->set_ctrl)
1957                 return -EINVAL;
1958
1959         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1960                 return -EFAULT;
1961
1962         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1963                 if (ctrl.id == s->qctrl[i].id) {
1964                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1965                                 return -EINVAL;
1966                         if (ctrl.value < s->qctrl[i].minimum ||
1967                             ctrl.value > s->qctrl[i].maximum)
1968                                 return -ERANGE;
1969                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1970                         break;
1971                 }
1972
1973         if ((err = s->set_ctrl(cam, &ctrl)))
1974                 return err;
1975
1976         s->_qctrl[i].default_value = ctrl.value;
1977
1978         PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
1979               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
1980
1981         return 0;
1982 }
1983
1984
1985 static int
1986 sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
1987 {
1988         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1989
1990         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1991         cc->pixelaspect.numerator = 1;
1992         cc->pixelaspect.denominator = 1;
1993
1994         if (copy_to_user(arg, cc, sizeof(*cc)))
1995                 return -EFAULT;
1996
1997         return 0;
1998 }
1999
2000
2001 static int
2002 sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
2003 {
2004         struct sn9c102_sensor* s = &cam->sensor;
2005         struct v4l2_crop crop = {
2006                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2007         };
2008
2009         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
2010
2011         if (copy_to_user(arg, &crop, sizeof(crop)))
2012                 return -EFAULT;
2013
2014         return 0;
2015 }
2016
2017
2018 static int
2019 sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
2020 {
2021         struct sn9c102_sensor* s = &cam->sensor;
2022         struct v4l2_crop crop;
2023         struct v4l2_rect* rect;
2024         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2025         struct v4l2_pix_format* pix_format = &(s->pix_format);
2026         u8 scale;
2027         const enum sn9c102_stream_state stream = cam->stream;
2028         const u32 nbuffers = cam->nbuffers;
2029         u32 i;
2030         int err = 0;
2031
2032         if (copy_from_user(&crop, arg, sizeof(crop)))
2033                 return -EFAULT;
2034
2035         rect = &(crop.c);
2036
2037         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2038                 return -EINVAL;
2039
2040         if (cam->module_param.force_munmap)
2041                 for (i = 0; i < cam->nbuffers; i++)
2042                         if (cam->frame[i].vma_use_count) {
2043                                 DBG(3, "VIDIOC_S_CROP failed. "
2044                                        "Unmap the buffers first.");
2045                                 return -EINVAL;
2046                         }
2047
2048         /* Preserve R,G or B origin */
2049         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
2050         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
2051
2052         if (rect->width < 16)
2053                 rect->width = 16;
2054         if (rect->height < 16)
2055                 rect->height = 16;
2056         if (rect->width > bounds->width)
2057                 rect->width = bounds->width;
2058         if (rect->height > bounds->height)
2059                 rect->height = bounds->height;
2060         if (rect->left < bounds->left)
2061                 rect->left = bounds->left;
2062         if (rect->top < bounds->top)
2063                 rect->top = bounds->top;
2064         if (rect->left + rect->width > bounds->left + bounds->width)
2065                 rect->left = bounds->left+bounds->width - rect->width;
2066         if (rect->top + rect->height > bounds->top + bounds->height)
2067                 rect->top = bounds->top+bounds->height - rect->height;
2068
2069         rect->width &= ~15L;
2070         rect->height &= ~15L;
2071
2072         if (SN9C102_PRESERVE_IMGSCALE) {
2073                 /* Calculate the actual scaling factor */
2074                 u32 a, b;
2075                 a = rect->width * rect->height;
2076                 b = pix_format->width * pix_format->height;
2077                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2078         } else
2079                 scale = 1;
2080
2081         if (cam->stream == STREAM_ON)
2082                 if ((err = sn9c102_stream_interrupt(cam)))
2083                         return err;
2084
2085         if (copy_to_user(arg, &crop, sizeof(crop))) {
2086                 cam->stream = stream;
2087                 return -EFAULT;
2088         }
2089
2090         if (cam->module_param.force_munmap || cam->io == IO_READ)
2091                 sn9c102_release_buffers(cam);
2092
2093         err = sn9c102_set_crop(cam, rect);
2094         if (s->set_crop)
2095                 err += s->set_crop(cam, rect);
2096         err += sn9c102_set_scale(cam, scale);
2097
2098         if (err) { /* atomic, no rollback in ioctl() */
2099                 cam->state |= DEV_MISCONFIGURED;
2100                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
2101                        "use the camera, close and open /dev/video%d again.",
2102                     cam->v4ldev->minor);
2103                 return -EIO;
2104         }
2105
2106         s->pix_format.width = rect->width/scale;
2107         s->pix_format.height = rect->height/scale;
2108         memcpy(&(s->_rect), rect, sizeof(*rect));
2109
2110         if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
2111             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2112                 cam->state |= DEV_MISCONFIGURED;
2113                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
2114                        "use the camera, close and open /dev/video%d again.",
2115                     cam->v4ldev->minor);
2116                 return -ENOMEM;
2117         }
2118
2119         if (cam->io == IO_READ)
2120                 sn9c102_empty_framequeues(cam);
2121         else if (cam->module_param.force_munmap)
2122                 sn9c102_requeue_outqueue(cam);
2123
2124         cam->stream = stream;
2125
2126         return 0;
2127 }
2128
2129
2130 static int
2131 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2132 {
2133         struct v4l2_fmtdesc fmtd;
2134
2135         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2136                 return -EFAULT;
2137
2138         if (fmtd.index == 0) {
2139                 strcpy(fmtd.description, "bayer rgb");
2140                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2141         } else if (fmtd.index == 1) {
2142                 strcpy(fmtd.description, "compressed");
2143                 fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2144                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2145         } else
2146                 return -EINVAL;
2147
2148         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2149         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2150
2151         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2152                 return -EFAULT;
2153
2154         return 0;
2155 }
2156
2157
2158 static int
2159 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2160 {
2161         struct v4l2_format format;
2162         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
2163
2164         if (copy_from_user(&format, arg, sizeof(format)))
2165                 return -EFAULT;
2166
2167         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2168                 return -EINVAL;
2169
2170         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_SN9C10X)
2171                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2172         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2173         pfmt->field = V4L2_FIELD_NONE;
2174         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2175
2176         if (copy_to_user(arg, &format, sizeof(format)))
2177                 return -EFAULT;
2178
2179         return 0;
2180 }
2181
2182
2183 static int
2184 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2185                          void __user * arg)
2186 {
2187         struct sn9c102_sensor* s = &cam->sensor;
2188         struct v4l2_format format;
2189         struct v4l2_pix_format* pix;
2190         struct v4l2_pix_format* pfmt = &(s->pix_format);
2191         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2192         struct v4l2_rect rect;
2193         u8 scale;
2194         const enum sn9c102_stream_state stream = cam->stream;
2195         const u32 nbuffers = cam->nbuffers;
2196         u32 i;
2197         int err = 0;
2198
2199         if (copy_from_user(&format, arg, sizeof(format)))
2200                 return -EFAULT;
2201
2202         pix = &(format.fmt.pix);
2203
2204         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2205                 return -EINVAL;
2206
2207         memcpy(&rect, &(s->_rect), sizeof(rect));
2208
2209         { /* calculate the actual scaling factor */
2210                 u32 a, b;
2211                 a = rect.width * rect.height;
2212                 b = pix->width * pix->height;
2213                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2214         }
2215
2216         rect.width = scale * pix->width;
2217         rect.height = scale * pix->height;
2218
2219         if (rect.width < 16)
2220                 rect.width = 16;
2221         if (rect.height < 16)
2222                 rect.height = 16;
2223         if (rect.width > bounds->left + bounds->width - rect.left)
2224                 rect.width = bounds->left + bounds->width - rect.left;
2225         if (rect.height > bounds->top + bounds->height - rect.top)
2226                 rect.height = bounds->top + bounds->height - rect.top;
2227
2228         rect.width &= ~15L;
2229         rect.height &= ~15L;
2230
2231         { /* adjust the scaling factor */
2232                 u32 a, b;
2233                 a = rect.width * rect.height;
2234                 b = pix->width * pix->height;
2235                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2236         }
2237
2238         pix->width = rect.width / scale;
2239         pix->height = rect.height / scale;
2240
2241         if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2242             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2243                 pix->pixelformat = pfmt->pixelformat;
2244         pix->priv = pfmt->priv; /* bpp */
2245         pix->colorspace = pfmt->colorspace;
2246         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
2247                             ? 0 : (pix->width * pix->priv) / 8;
2248         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2249         pix->field = V4L2_FIELD_NONE;
2250
2251         if (cmd == VIDIOC_TRY_FMT) {
2252                 if (copy_to_user(arg, &format, sizeof(format)))
2253                         return -EFAULT;
2254                 return 0;
2255         }
2256
2257         if (cam->module_param.force_munmap)
2258                 for (i = 0; i < cam->nbuffers; i++)
2259                         if (cam->frame[i].vma_use_count) {
2260                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2261                                        "buffers first.");
2262                                 return -EINVAL;
2263                         }
2264
2265         if (cam->stream == STREAM_ON)
2266                 if ((err = sn9c102_stream_interrupt(cam)))
2267                         return err;
2268
2269         if (copy_to_user(arg, &format, sizeof(format))) {
2270                 cam->stream = stream;
2271                 return -EFAULT;
2272         }
2273
2274         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2275                 sn9c102_release_buffers(cam);
2276
2277         err += sn9c102_set_pix_format(cam, pix);
2278         err += sn9c102_set_crop(cam, &rect);
2279         if (s->set_pix_format)
2280                 err += s->set_pix_format(cam, pix);
2281         if (s->set_crop)
2282                 err += s->set_crop(cam, &rect);
2283         err += sn9c102_set_scale(cam, scale);
2284
2285         if (err) { /* atomic, no rollback in ioctl() */
2286                 cam->state |= DEV_MISCONFIGURED;
2287                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2288                        "use the camera, close and open /dev/video%d again.",
2289                     cam->v4ldev->minor);
2290                 return -EIO;
2291         }
2292
2293         memcpy(pfmt, pix, sizeof(*pix));
2294         memcpy(&(s->_rect), &rect, sizeof(rect));
2295
2296         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2297             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2298                 cam->state |= DEV_MISCONFIGURED;
2299                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2300                        "use the camera, close and open /dev/video%d again.",
2301                     cam->v4ldev->minor);
2302                 return -ENOMEM;
2303         }
2304
2305         if (cam->io == IO_READ)
2306                 sn9c102_empty_framequeues(cam);
2307         else if (cam->module_param.force_munmap)
2308                 sn9c102_requeue_outqueue(cam);
2309
2310         cam->stream = stream;
2311
2312         return 0;
2313 }
2314
2315
2316 static int
2317 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2318 {
2319         if (copy_to_user(arg, &cam->compression,
2320                          sizeof(cam->compression)))
2321                 return -EFAULT;
2322
2323         return 0;
2324 }
2325
2326
2327 static int
2328 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2329 {
2330         struct v4l2_jpegcompression jc;
2331         const enum sn9c102_stream_state stream = cam->stream;
2332         int err = 0;
2333
2334         if (copy_from_user(&jc, arg, sizeof(jc)))
2335                 return -EFAULT;
2336
2337         if (jc.quality != 0 && jc.quality != 1)
2338                 return -EINVAL;
2339
2340         if (cam->stream == STREAM_ON)
2341                 if ((err = sn9c102_stream_interrupt(cam)))
2342                         return err;
2343
2344         err += sn9c102_set_compression(cam, &jc);
2345         if (err) { /* atomic, no rollback in ioctl() */
2346                 cam->state |= DEV_MISCONFIGURED;
2347                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2348                        "problems. To use the camera, close and open "
2349                        "/dev/video%d again.", cam->v4ldev->minor);
2350                 return -EIO;
2351         }
2352
2353         cam->compression.quality = jc.quality;
2354
2355         cam->stream = stream;
2356
2357         return 0;
2358 }
2359
2360
2361 static int
2362 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2363 {
2364         struct v4l2_requestbuffers rb;
2365         u32 i;
2366         int err;
2367
2368         if (copy_from_user(&rb, arg, sizeof(rb)))
2369                 return -EFAULT;
2370
2371         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2372             rb.memory != V4L2_MEMORY_MMAP)
2373                 return -EINVAL;
2374
2375         if (cam->io == IO_READ) {
2376                 DBG(3, "Close and open the device again to choose the mmap "
2377                        "I/O method");
2378                 return -EINVAL;
2379         }
2380
2381         for (i = 0; i < cam->nbuffers; i++)
2382                 if (cam->frame[i].vma_use_count) {
2383                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2384                                "still mapped.");
2385                         return -EINVAL;
2386                 }
2387
2388         if (cam->stream == STREAM_ON)
2389                 if ((err = sn9c102_stream_interrupt(cam)))
2390                         return err;
2391
2392         sn9c102_empty_framequeues(cam);
2393
2394         sn9c102_release_buffers(cam);
2395         if (rb.count)
2396                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2397
2398         if (copy_to_user(arg, &rb, sizeof(rb))) {
2399                 sn9c102_release_buffers(cam);
2400                 cam->io = IO_NONE;
2401                 return -EFAULT;
2402         }
2403
2404         cam->io = rb.count ? IO_MMAP : IO_NONE;
2405
2406         return 0;
2407 }
2408
2409
2410 static int
2411 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2412 {
2413         struct v4l2_buffer b;
2414
2415         if (copy_from_user(&b, arg, sizeof(b)))
2416                 return -EFAULT;
2417
2418         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2419             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2420                 return -EINVAL;
2421
2422         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2423
2424         if (cam->frame[b.index].vma_use_count)
2425                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2426
2427         if (cam->frame[b.index].state == F_DONE)
2428                 b.flags |= V4L2_BUF_FLAG_DONE;
2429         else if (cam->frame[b.index].state != F_UNUSED)
2430                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2431
2432         if (copy_to_user(arg, &b, sizeof(b)))
2433                 return -EFAULT;
2434
2435         return 0;
2436 }
2437
2438
2439 static int
2440 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2441 {
2442         struct v4l2_buffer b;
2443         unsigned long lock_flags;
2444
2445         if (copy_from_user(&b, arg, sizeof(b)))
2446                 return -EFAULT;
2447
2448         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2449             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2450                 return -EINVAL;
2451
2452         if (cam->frame[b.index].state != F_UNUSED)
2453                 return -EINVAL;
2454
2455         cam->frame[b.index].state = F_QUEUED;
2456
2457         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2458         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2459         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2460
2461         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2462
2463         return 0;
2464 }
2465
2466
2467 static int
2468 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2469                      void __user * arg)
2470 {
2471         struct v4l2_buffer b;
2472         struct sn9c102_frame_t *f;
2473         unsigned long lock_flags;
2474         long timeout;
2475
2476         if (copy_from_user(&b, arg, sizeof(b)))
2477                 return -EFAULT;
2478
2479         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2480                 return -EINVAL;
2481
2482         if (list_empty(&cam->outqueue)) {
2483                 if (cam->stream == STREAM_OFF)
2484                         return -EINVAL;
2485                 if (filp->f_flags & O_NONBLOCK)
2486                         return -EAGAIN;
2487                 timeout = wait_event_interruptible_timeout
2488                           ( cam->wait_frame,
2489                             (!list_empty(&cam->outqueue)) ||
2490                             (cam->state & DEV_DISCONNECTED) ||
2491                             (cam->state & DEV_MISCONFIGURED),
2492                             cam->module_param.frame_timeout *
2493                             1000 * msecs_to_jiffies(1) );
2494                 if (timeout < 0)
2495                         return timeout;
2496                 if (cam->state & DEV_DISCONNECTED)
2497                         return -ENODEV;
2498                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2499                         return -EIO;
2500         }
2501
2502         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2503         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2504         list_del(cam->outqueue.next);
2505         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2506
2507         f->state = F_UNUSED;
2508
2509         memcpy(&b, &f->buf, sizeof(b));
2510         if (f->vma_use_count)
2511                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2512
2513         if (copy_to_user(arg, &b, sizeof(b)))
2514                 return -EFAULT;
2515
2516         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2517
2518         return 0;
2519 }
2520
2521
2522 static int
2523 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2524 {
2525         int type;
2526
2527         if (copy_from_user(&type, arg, sizeof(type)))
2528                 return -EFAULT;
2529
2530         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2531                 return -EINVAL;
2532
2533         if (list_empty(&cam->inqueue))
2534                 return -EINVAL;
2535
2536         cam->stream = STREAM_ON;
2537
2538         DBG(3, "Stream on");
2539
2540         return 0;
2541 }
2542
2543
2544 static int
2545 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2546 {
2547         int type, err;
2548
2549         if (copy_from_user(&type, arg, sizeof(type)))
2550                 return -EFAULT;
2551
2552         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2553                 return -EINVAL;
2554
2555         if (cam->stream == STREAM_ON)
2556                 if ((err = sn9c102_stream_interrupt(cam)))
2557                         return err;
2558
2559         sn9c102_empty_framequeues(cam);
2560
2561         DBG(3, "Stream off");
2562
2563         return 0;
2564 }
2565
2566
2567 static int
2568 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2569 {
2570         struct v4l2_streamparm sp;
2571
2572         if (copy_from_user(&sp, arg, sizeof(sp)))
2573                 return -EFAULT;
2574
2575         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2576                 return -EINVAL;
2577
2578         sp.parm.capture.extendedmode = 0;
2579         sp.parm.capture.readbuffers = cam->nreadbuffers;
2580
2581         if (copy_to_user(arg, &sp, sizeof(sp)))
2582                 return -EFAULT;
2583
2584         return 0;
2585 }
2586
2587
2588 static int
2589 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
2590 {
2591         struct v4l2_streamparm sp;
2592
2593         if (copy_from_user(&sp, arg, sizeof(sp)))
2594                 return -EFAULT;
2595
2596         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2597                 return -EINVAL;
2598
2599         sp.parm.capture.extendedmode = 0;
2600
2601         if (sp.parm.capture.readbuffers == 0)
2602                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2603
2604         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
2605                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
2606
2607         if (copy_to_user(arg, &sp, sizeof(sp)))
2608                 return -EFAULT;
2609
2610         cam->nreadbuffers = sp.parm.capture.readbuffers;
2611
2612         return 0;
2613 }
2614
2615
2616 static int sn9c102_ioctl_v4l2(struct inode* inode, struct file* filp,
2617                               unsigned int cmd, void __user * arg)
2618 {
2619         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2620
2621         switch (cmd) {
2622
2623         case VIDIOC_QUERYCAP:
2624                 return sn9c102_vidioc_querycap(cam, arg);
2625
2626         case VIDIOC_ENUMINPUT:
2627                 return sn9c102_vidioc_enuminput(cam, arg);
2628
2629         case VIDIOC_G_INPUT:
2630                 return sn9c102_vidioc_g_input(cam, arg);
2631
2632         case VIDIOC_S_INPUT:
2633                 return sn9c102_vidioc_s_input(cam, arg);
2634
2635         case VIDIOC_QUERYCTRL:
2636                 return sn9c102_vidioc_query_ctrl(cam, arg);
2637
2638         case VIDIOC_G_CTRL:
2639                 return sn9c102_vidioc_g_ctrl(cam, arg);
2640
2641         case VIDIOC_S_CTRL:
2642                 return sn9c102_vidioc_s_ctrl(cam, arg);
2643
2644         case VIDIOC_CROPCAP:
2645                 return sn9c102_vidioc_cropcap(cam, arg);
2646
2647         case VIDIOC_G_CROP:
2648                 return sn9c102_vidioc_g_crop(cam, arg);
2649
2650         case VIDIOC_S_CROP:
2651                 return sn9c102_vidioc_s_crop(cam, arg);
2652
2653         case VIDIOC_ENUM_FMT:
2654                 return sn9c102_vidioc_enum_fmt(cam, arg);
2655
2656         case VIDIOC_G_FMT:
2657                 return sn9c102_vidioc_g_fmt(cam, arg);
2658
2659         case VIDIOC_TRY_FMT:
2660         case VIDIOC_S_FMT:
2661                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
2662
2663         case VIDIOC_G_JPEGCOMP:
2664                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
2665
2666         case VIDIOC_S_JPEGCOMP:
2667                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
2668
2669         case VIDIOC_REQBUFS:
2670                 return sn9c102_vidioc_reqbufs(cam, arg);
2671
2672         case VIDIOC_QUERYBUF:
2673                 return sn9c102_vidioc_querybuf(cam, arg);
2674
2675         case VIDIOC_QBUF:
2676                 return sn9c102_vidioc_qbuf(cam, arg);
2677
2678         case VIDIOC_DQBUF:
2679                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
2680
2681         case VIDIOC_STREAMON:
2682                 return sn9c102_vidioc_streamon(cam, arg);
2683
2684         case VIDIOC_STREAMOFF:
2685                 return sn9c102_vidioc_streamoff(cam, arg);
2686
2687         case VIDIOC_G_PARM:
2688                 return sn9c102_vidioc_g_parm(cam, arg);
2689
2690         case VIDIOC_S_PARM:
2691                 return sn9c102_vidioc_s_parm(cam, arg);
2692
2693         case VIDIOC_G_STD:
2694         case VIDIOC_S_STD:
2695         case VIDIOC_QUERYSTD:
2696         case VIDIOC_ENUMSTD:
2697         case VIDIOC_QUERYMENU:
2698                 return -EINVAL;
2699
2700         default:
2701                 return -EINVAL;
2702
2703         }
2704 }
2705
2706
2707 static int sn9c102_ioctl(struct inode* inode, struct file* filp,
2708                          unsigned int cmd, unsigned long arg)
2709 {
2710         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2711         int err = 0;
2712
2713         if (mutex_lock_interruptible(&cam->fileop_mutex))
2714                 return -ERESTARTSYS;
2715
2716         if (cam->state & DEV_DISCONNECTED) {
2717                 DBG(1, "Device not present");
2718                 mutex_unlock(&cam->fileop_mutex);
2719                 return -ENODEV;
2720         }
2721
2722         if (cam->state & DEV_MISCONFIGURED) {
2723                 DBG(1, "The camera is misconfigured. Close and open it "
2724                        "again.");
2725                 mutex_unlock(&cam->fileop_mutex);
2726                 return -EIO;
2727         }
2728
2729         V4LDBG(3, "sn9c102", cmd);
2730
2731         err = sn9c102_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2732
2733         mutex_unlock(&cam->fileop_mutex);
2734
2735         return err;
2736 }
2737
2738 /*****************************************************************************/
2739
2740 static struct file_operations sn9c102_fops = {
2741         .owner = THIS_MODULE,
2742         .open =    sn9c102_open,
2743         .release = sn9c102_release,
2744         .ioctl =   sn9c102_ioctl,
2745         .read =    sn9c102_read,
2746         .poll =    sn9c102_poll,
2747         .mmap =    sn9c102_mmap,
2748         .llseek =  no_llseek,
2749 };
2750
2751 /*****************************************************************************/
2752
2753 /* It exists a single interface only. We do not need to validate anything. */
2754 static int
2755 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2756 {
2757         struct usb_device *udev = interface_to_usbdev(intf);
2758         struct sn9c102_device* cam;
2759         static unsigned int dev_nr = 0;
2760         unsigned int i;
2761         int err = 0, r;
2762
2763         if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
2764                 return -ENOMEM;
2765
2766         cam->usbdev = udev;
2767
2768         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2769                 DBG(1, "kmalloc() failed");
2770                 err = -ENOMEM;
2771                 goto fail;
2772         }
2773
2774         if (!(cam->v4ldev = video_device_alloc())) {
2775                 DBG(1, "video_device_alloc() failed");
2776                 err = -ENOMEM;
2777                 goto fail;
2778         }
2779
2780         mutex_init(&cam->dev_mutex);
2781
2782         r = sn9c102_read_reg(cam, 0x00);
2783         if (r < 0 || r != 0x10) {
2784                 DBG(1, "Sorry, this is not a SN9C10x based camera "
2785                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2786                 err = -ENODEV;
2787                 goto fail;
2788         }
2789
2790         cam->bridge = (id->idProduct & 0xffc0) == 0x6080 ?
2791                       BRIDGE_SN9C103 : BRIDGE_SN9C102;
2792         switch (cam->bridge) {
2793         case BRIDGE_SN9C101:
2794         case BRIDGE_SN9C102:
2795                 DBG(2, "SN9C10[12] PC Camera Controller detected "
2796                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2797                 break;
2798         case BRIDGE_SN9C103:
2799                 DBG(2, "SN9C103 PC Camera Controller detected "
2800                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2801                 break;
2802         }
2803
2804         for  (i = 0; sn9c102_sensor_table[i]; i++) {
2805                 err = sn9c102_sensor_table[i](cam);
2806                 if (!err)
2807                         break;
2808         }
2809
2810         if (!err) {
2811                 DBG(2, "%s image sensor detected", cam->sensor.name);
2812                 DBG(3, "Support for %s maintained by %s",
2813                     cam->sensor.name, cam->sensor.maintainer);
2814         } else {
2815                 DBG(1, "No supported image sensor detected");
2816                 err = -ENODEV;
2817                 goto fail;
2818         }
2819
2820         if (sn9c102_init(cam)) {
2821                 DBG(1, "Initialization failed. I will retry on open().");
2822                 cam->state |= DEV_MISCONFIGURED;
2823         }
2824
2825         strcpy(cam->v4ldev->name, "SN9C10x PC Camera");
2826         cam->v4ldev->owner = THIS_MODULE;
2827         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2828         cam->v4ldev->hardware = 0;
2829         cam->v4ldev->fops = &sn9c102_fops;
2830         cam->v4ldev->minor = video_nr[dev_nr];
2831         cam->v4ldev->release = video_device_release;
2832         video_set_drvdata(cam->v4ldev, cam);
2833
2834         mutex_lock(&cam->dev_mutex);
2835
2836         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2837                                     video_nr[dev_nr]);
2838         if (err) {
2839                 DBG(1, "V4L2 device registration failed");
2840                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2841                         DBG(1, "Free /dev/videoX node not found");
2842                 goto fail2;
2843         }
2844
2845         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2846
2847         cam->module_param.force_munmap = force_munmap[dev_nr];
2848         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2849
2850         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2851
2852 #ifdef CONFIG_VIDEO_ADV_DEBUG
2853         err = sn9c102_create_sysfs(cam);
2854         if (err)
2855                 goto fail3;
2856         DBG(2, "Optional device control through 'sysfs' interface ready");
2857 #endif
2858
2859         usb_set_intfdata(intf, cam);
2860
2861         mutex_unlock(&cam->dev_mutex);
2862
2863         return 0;
2864
2865 #ifdef CONFIG_VIDEO_ADV_DEBUG
2866 fail3:
2867         video_unregister_device(cam->v4ldev);
2868 #endif
2869 fail2:
2870         video_nr[dev_nr] = -1;
2871         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2872         mutex_unlock(&cam->dev_mutex);
2873 fail:
2874         if (cam) {
2875                 kfree(cam->control_buffer);
2876                 if (cam->v4ldev)
2877                         video_device_release(cam->v4ldev);
2878                 kfree(cam);
2879         }
2880         return err;
2881 }
2882
2883
2884 static void sn9c102_usb_disconnect(struct usb_interface* intf)
2885 {
2886         struct sn9c102_device* cam = usb_get_intfdata(intf);
2887
2888         if (!cam)
2889                 return;
2890
2891         down_write(&sn9c102_disconnect);
2892
2893         mutex_lock(&cam->dev_mutex);
2894
2895         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2896
2897         wake_up_interruptible_all(&cam->open);
2898
2899         if (cam->users) {
2900                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2901                        "memory deallocation are deferred on close.",
2902                     cam->v4ldev->minor);
2903                 cam->state |= DEV_MISCONFIGURED;
2904                 sn9c102_stop_transfer(cam);
2905                 cam->state |= DEV_DISCONNECTED;
2906                 wake_up_interruptible(&cam->wait_frame);
2907                 wake_up(&cam->wait_stream);
2908                 usb_get_dev(cam->usbdev);
2909         } else {
2910                 cam->state |= DEV_DISCONNECTED;
2911                 sn9c102_release_resources(cam);
2912         }
2913
2914         mutex_unlock(&cam->dev_mutex);
2915
2916         if (!cam->users)
2917                 kfree(cam);
2918
2919         up_write(&sn9c102_disconnect);
2920 }
2921
2922
2923 static struct usb_driver sn9c102_usb_driver = {
2924         .name =       "sn9c102",
2925         .id_table =   sn9c102_id_table,
2926         .probe =      sn9c102_usb_probe,
2927         .disconnect = sn9c102_usb_disconnect,
2928 };
2929
2930 /*****************************************************************************/
2931
2932 static int __init sn9c102_module_init(void)
2933 {
2934         int err = 0;
2935
2936         KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
2937         KDBG(3, SN9C102_MODULE_AUTHOR);
2938
2939         if ((err = usb_register(&sn9c102_usb_driver)))
2940                 KDBG(1, "usb_register() failed");
2941
2942         return err;
2943 }
2944
2945
2946 static void __exit sn9c102_module_exit(void)
2947 {
2948         usb_deregister(&sn9c102_usb_driver);
2949 }
2950
2951
2952 module_init(sn9c102_module_init);
2953 module_exit(sn9c102_module_exit);