drivers/usb/media/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/string.h>
  29 #include <linux/device.h>
  30 #include <linux/fs.h>
  31 #include <linux/delay.h>
  32 #include <linux/stddef.h>
  33 #include <linux/compiler.h>
  34 #include <linux/ioctl.h>
  35 #include <linux/poll.h>
  36 #include <linux/stat.h>
  37 #include <linux/mm.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/page-flags.h>
  40 #include <linux/byteorder/generic.h>
  41 #include <asm/page.h>
  42 #include <asm/uaccess.h>
  43
  44 #include "sn9c102.h"
  45
  46 /*****************************************************************************/
  47
  48 MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
  49
  50 MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
  51 MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
  52 MODULE_VERSION(SN9C102_MODULE_VERSION);
  53 MODULE_LICENSE(SN9C102_MODULE_LICENSE);
  54
  55 static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
  56 module_param_array(video_nr, short, NULL, 0444);
  57 MODULE_PARM_DESC(video_nr,
  58                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  59                  "\n -1 = use next available (default)"
  60                  "\n  n = use minor number n (integer >= 0)"
  61                  "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
  62                  " cameras this way."
  63                  "\nFor example:"
  64                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  65                  "\nthe second camera and use auto for the first"
  66                  "\none and for every other camera."
  67                  "\n");
  68
  69 static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  70                                SN9C102_FORCE_MUNMAP};
  71 module_param_array(force_munmap, bool, NULL, 0444);
  72 MODULE_PARM_DESC(force_munmap,
  73                  "\n<0|1[,...]> Force the application to unmap previously"
  74                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  75                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  76                  "\nthis feature. This parameter is specific for each"
  77                  "\ndetected camera."
  78                  "\n 0 = do not force memory unmapping"
  79                  "\n 1 = force memory unmapping (save memory)"
  80                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
  81                  "\n");
  82
  83 #ifdef SN9C102_DEBUG
  84 static unsigned short debug = SN9C102_DEBUG_LEVEL;
  85 module_param(debug, ushort, 0644);
  86 MODULE_PARM_DESC(debug,
  87                  "\n<n> Debugging information level, from 0 to 3:"
  88                  "\n0 = none (use carefully)"
  89                  "\n1 = critical errors"
  90                  "\n2 = significant informations"
  91                  "\n3 = more verbose messages"
  92                  "\nLevel 3 is useful for testing only, when only "
  93                  "one device is used."
  94                  "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
  95                  "\n");
  96 #endif
  97
  98 /*****************************************************************************/
  99
 100 static sn9c102_sof_header_t sn9c102_sof_header[] = {
 101         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x00},
 102         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x01},
 103 };
 104
 105 static sn9c103_sof_header_t sn9c103_sof_header[] = {
 106         {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, 0x20},
 107 };
 108
 109 static sn9c102_eof_header_t sn9c102_eof_header[] = {
 110         {0x00, 0x00, 0x00, 0x00},
 111         {0x40, 0x00, 0x00, 0x00},
 112         {0x80, 0x00, 0x00, 0x00},
 113         {0xc0, 0x00, 0x00, 0x00},
 114 };
 115
 116 /*****************************************************************************/
 117
 118 static void* rvmalloc(size_t size)
 119 {
 120         void* mem;
 121         unsigned long adr;
 122
 123         size = PAGE_ALIGN(size);
 124
 125         mem = vmalloc_32((unsigned long)size);
 126         if (!mem)
 127                 return NULL;
 128
 129         memset(mem, 0, size);
 130
 131         adr = (unsigned long)mem;
 132         while (size > 0) {
 133                 SetPageReserved(vmalloc_to_page((void *)adr));
 134                 adr += PAGE_SIZE;
 135                 size -= PAGE_SIZE;
 136         }
 137
 138         return mem;
 139 }
 140
 141
 142 static void rvfree(void* mem, size_t size)
 143 {
 144         unsigned long adr;
 145
 146         if (!mem)
 147                 return;
 148
 149         size = PAGE_ALIGN(size);
 150
 151         adr = (unsigned long)mem;
 152         while (size > 0) {
 153                 ClearPageReserved(vmalloc_to_page((void *)adr));
 154                 adr += PAGE_SIZE;
 155                 size -= PAGE_SIZE;
 156         }
 157
 158         vfree(mem);
 159 }
 160
 161
 162 static u32
 163 sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
 164                         enum sn9c102_io_method io)
 165 {
 166         struct v4l2_pix_format* p = &(cam->sensor->pix_format);
 167         struct v4l2_rect* r = &(cam->sensor->cropcap.bounds);
 168         const size_t imagesize = cam->module_param.force_munmap ||
 169                                  io == IO_READ ?
 170                                  (p->width * p->height * p->priv) / 8 :
 171                                  (r->width * r->height * p->priv) / 8;
 172         void* buff = NULL;
 173         u32 i;
 174
 175         if (count > SN9C102_MAX_FRAMES)
 176                 count = SN9C102_MAX_FRAMES;
 177
 178         cam->nbuffers = count;
 179         while (cam->nbuffers > 0) {
 180                 if ((buff = rvmalloc(cam->nbuffers * PAGE_ALIGN(imagesize))))
 181                         break;
 182                 cam->nbuffers--;
 183         }
 184
 185         for (i = 0; i < cam->nbuffers; i++) {
 186                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 187                 cam->frame[i].buf.index = i;
 188                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 189                 cam->frame[i].buf.length = imagesize;
 190                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 191                 cam->frame[i].buf.sequence = 0;
 192                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 193                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 194                 cam->frame[i].buf.flags = 0;
 195         }
 196
 197         return cam->nbuffers;
 198 }
 199
 200
 201 static void sn9c102_release_buffers(struct sn9c102_device* cam)
 202 {
 203         if (cam->nbuffers) {
 204                 rvfree(cam->frame[0].bufmem,
 205                        cam->nbuffers * PAGE_ALIGN(cam->frame[0].buf.length));
 206                 cam->nbuffers = 0;
 207         }
 208         cam->frame_current = NULL;
 209 }
 210
 211
 212 static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
 213 {
 214         u32 i;
 215
 216         INIT_LIST_HEAD(&cam->inqueue);
 217         INIT_LIST_HEAD(&cam->outqueue);
 218
 219         for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
 220                 cam->frame[i].state = F_UNUSED;
 221                 cam->frame[i].buf.bytesused = 0;
 222         }
 223 }
 224
 225
 226 static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
 227 {
 228         struct sn9c102_frame_t *i;
 229
 230         list_for_each_entry(i, &cam->outqueue, frame) {
 231                 i->state = F_QUEUED;
 232                 list_add(&i->frame, &cam->inqueue);
 233         }
 234
 235         INIT_LIST_HEAD(&cam->outqueue);
 236 }
 237
 238
 239 static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
 240 {
 241         unsigned long lock_flags;
 242         u32 i;
 243
 244         for (i = 0; i < cam->nbuffers; i++)
 245                 if (cam->frame[i].state == F_UNUSED) {
 246                         cam->frame[i].state = F_QUEUED;
 247                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 248                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 249                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 250                 }
 251 }
 252
 253 /*****************************************************************************/
 254
 255 int sn9c102_write_regs(struct sn9c102_device* cam, u8* buff, u16 index)
 256 {
 257         struct usb_device* udev = cam->usbdev;
 258         int i, res;
 259
 260         if (index + sizeof(buff) >= ARRAY_SIZE(cam->reg))
 261                 return -1;
 262
 263         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 264                               index, 0, buff, sizeof(buff),
 265                               SN9C102_CTRL_TIMEOUT*sizeof(buff));
 266         if (res < 0) {
 267                 DBG(3, "Failed to write registers (index 0x%02X, error %d)",
 268                     index, res);
 269                 return -1;
 270         }
 271
 272         for (i = 0; i < sizeof(buff); i++)
 273                 cam->reg[index+i] = buff[i];
 274
 275         return 0;
 276 }
 277
 278
 279 int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
 280 {
 281         struct usb_device* udev = cam->usbdev;
 282         u8* buff = cam->control_buffer;
 283         int res;
 284
 285         if (index >= ARRAY_SIZE(cam->reg))
 286                 return -1;
 287
 288         *buff = value;
 289
 290         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 291                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 292         if (res < 0) {
 293                 DBG(3, "Failed to write a register (value 0x%02X, index "
 294                        "0x%02X, error %d)", value, index, res);
 295                 return -1;
 296         }
 297
 298         cam->reg[index] = value;
 299
 300         return 0;
 301 }
 302
 303
 304 /* NOTE: reading some registers always returns 0 */
 305 static int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
 306 {
 307         struct usb_device* udev = cam->usbdev;
 308         u8* buff = cam->control_buffer;
 309         int res;
 310
 311         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 312                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 313         if (res < 0)
 314                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 315                     index, res);
 316
 317         return (res >= 0) ? (int)(*buff) : -1;
 318 }
 319
 320
 321 int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
 322 {
 323         if (index >= ARRAY_SIZE(cam->reg))
 324                 return -1;
 325
 326         return cam->reg[index];
 327 }
 328
 329
 330 static int
 331 sn9c102_i2c_wait(struct sn9c102_device* cam, struct sn9c102_sensor* sensor)
 332 {
 333         int i, r;
 334
 335         for (i = 1; i <= 5; i++) {
 336                 r = sn9c102_read_reg(cam, 0x08);
 337                 if (r < 0)
 338                         return -EIO;
 339                 if (r & 0x04)
 340                         return 0;
 341                 if (sensor->frequency & SN9C102_I2C_400KHZ)
 342                         udelay(5*16);
 343                 else
 344                         udelay(16*16);
 345         }
 346         return -EBUSY;
 347 }
 348
 349
 350 static int
 351 sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
 352                               struct sn9c102_sensor* sensor)
 353 {
 354         int r;
 355         r = sn9c102_read_reg(cam, 0x08);
 356         return (r < 0 || (r >= 0 && !(r & 0x08))) ? -EIO : 0;
 357 }
 358
 359
 360 static int
 361 sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
 362                                struct sn9c102_sensor* sensor)
 363 {
 364         int r;
 365         r = sn9c102_read_reg(cam, 0x08);
 366         return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
 367 }
 368
 369
 370 int
 371 sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
 372                          struct sn9c102_sensor* sensor, u8 data0, u8 data1,
 373                          u8 n, u8 buffer[])
 374 {
 375         struct usb_device* udev = cam->usbdev;
 376         u8* data = cam->control_buffer;
 377         int err = 0, res;
 378
 379         /* Write cycle */
 380         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 381                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
 382         data[1] = data0; /* I2C slave id */
 383         data[2] = data1; /* address */
 384         data[7] = 0x10;
 385         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 386                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 387         if (res < 0)
 388                 err += res;
 389
 390         err += sn9c102_i2c_wait(cam, sensor);
 391
 392         /* Read cycle - n bytes */
 393         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 394                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
 395                   (n << 4) | 0x02;
 396         data[1] = data0;
 397         data[7] = 0x10;
 398         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 399                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 400         if (res < 0)
 401                 err += res;
 402
 403         err += sn9c102_i2c_wait(cam, sensor);
 404
 405         /* The first read byte will be placed in data[4] */
 406         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 407                               0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
 408         if (res < 0)
 409                 err += res;
 410
 411         err += sn9c102_i2c_detect_read_error(cam, sensor);
 412
 413         PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
 414               data[4]);
 415
 416         if (err) {
 417                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 418                 return -1;
 419         }
 420
 421         if (buffer)
 422                 memcpy(buffer, data, sizeof(buffer));
 423
 424         return (int)data[4];
 425 }
 426
 427
 428 int
 429 sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
 430                           struct sn9c102_sensor* sensor, u8 n, u8 data0,
 431                           u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
 432 {
 433         struct usb_device* udev = cam->usbdev;
 434         u8* data = cam->control_buffer;
 435         int err = 0, res;
 436
 437         /* Write cycle. It usually is address + value */
 438         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 439                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
 440                   | ((n - 1) << 4);
 441         data[1] = data0;
 442         data[2] = data1;
 443         data[3] = data2;
 444         data[4] = data3;
 445         data[5] = data4;
 446         data[6] = data5;
 447         data[7] = 0x14;
 448         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 449                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 450         if (res < 0)
 451                 err += res;
 452
 453         err += sn9c102_i2c_wait(cam, sensor);
 454         err += sn9c102_i2c_detect_write_error(cam, sensor);
 455
 456         if (err)
 457                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 458
 459         PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
 460               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
 461               n, data0, data1, data2, data3, data4, data5);
 462
 463         return err ? -1 : 0;
 464 }
 465
 466
 467 int
 468 sn9c102_i2c_try_read(struct sn9c102_device* cam,
 469                      struct sn9c102_sensor* sensor, u8 address)
 470 {
 471         return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
 472                                         address, 1, NULL);
 473 }
 474
 475
 476 int
 477 sn9c102_i2c_try_write(struct sn9c102_device* cam,
 478                       struct sn9c102_sensor* sensor, u8 address, u8 value)
 479 {
 480         return sn9c102_i2c_try_raw_write(cam, sensor, 3,
 481                                          sensor->i2c_slave_id, address,
 482                                          value, 0, 0, 0);
 483 }
 484
 485
 486 int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
 487 {
 488         if (!cam->sensor)
 489                 return -1;
 490
 491         return sn9c102_i2c_try_read(cam, cam->sensor, address);
 492 }
 493
 494
 495 int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
 496 {
 497         if (!cam->sensor)
 498                 return -1;
 499
 500         return sn9c102_i2c_try_write(cam, cam->sensor, address, value);
 501 }
 502
 503 /*****************************************************************************/
 504
 505 static void*
 506 sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
 507 {
 508         size_t soflen = 0, i;
 509         u8 j, n = 0;
 510
 511         switch (cam->bridge) {
 512         case BRIDGE_SN9C101:
 513         case BRIDGE_SN9C102:
 514                 soflen = sizeof(sn9c102_sof_header_t);
 515                 n = sizeof(sn9c102_sof_header) / soflen;
 516                 break;
 517         case BRIDGE_SN9C103:
 518                 soflen = sizeof(sn9c103_sof_header_t);
 519                 n = sizeof(sn9c103_sof_header) / soflen;
 520         }
 521
 522         for (i = 0; (len >= soflen) && (i <= len - soflen); i++)
 523                 for (j = 0; j < n; j++)
 524                         /* The invariable part of the header is 6 bytes long */
 525                         if ((cam->bridge != BRIDGE_SN9C103 &&
 526                             !memcmp(mem + i, sn9c102_sof_header[j], 6)) ||
 527                             (cam->bridge == BRIDGE_SN9C103 &&
 528                             !memcmp(mem + i, sn9c103_sof_header[j], 6))) {
 529                                 memcpy(cam->sof_header, mem + i, soflen);
 530                                 /* Skip the header */
 531                                 return mem + i + soflen;
 532                         }
 533
 534         return NULL;
 535 }
 536
 537
 538 static void*
 539 sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
 540 {
 541         size_t eoflen = sizeof(sn9c102_eof_header_t), i;
 542         unsigned j, n = sizeof(sn9c102_eof_header) / eoflen;
 543
 544         if (cam->sensor->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
 545                 return NULL; /* EOF header does not exist in compressed data */
 546
 547         for (i = 0; (len >= eoflen) && (i <= len - eoflen); i++)
 548                 for (j = 0; j < n; j++)
 549                         if (!memcmp(mem + i, sn9c102_eof_header[j], eoflen))
 550                                 return mem + i;
 551
 552         return NULL;
 553 }
 554
 555
 556 static void sn9c102_urb_complete(struct urb *urb, struct pt_regs* regs)
 557 {
 558         struct sn9c102_device* cam = urb->context;
 559         struct sn9c102_frame_t** f;
 560         size_t imagesize, soflen;
 561         u8 i;
 562         int err = 0;
 563
 564         if (urb->status == -ENOENT)
 565                 return;
 566
 567         f = &cam->frame_current;
 568
 569         if (cam->stream == STREAM_INTERRUPT) {
 570                 cam->stream = STREAM_OFF;
 571                 if ((*f))
 572                         (*f)->state = F_QUEUED;
 573                 DBG(3, "Stream interrupted");
 574                 wake_up_interruptible(&cam->wait_stream);
 575         }
 576
 577         if (cam->state & DEV_DISCONNECTED)
 578                 return;
 579
 580         if (cam->state & DEV_MISCONFIGURED) {
 581                 wake_up_interruptible(&cam->wait_frame);
 582                 return;
 583         }
 584
 585         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 586                 goto resubmit_urb;
 587
 588         if (!(*f))
 589                 (*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
 590                                   frame);
 591
 592         imagesize = (cam->sensor->pix_format.width *
 593                      cam->sensor->pix_format.height *
 594                      cam->sensor->pix_format.priv) / 8;
 595
 596         soflen = (cam->bridge) == BRIDGE_SN9C103 ?
 597                                   sizeof(sn9c103_sof_header_t) :
 598                                   sizeof(sn9c102_sof_header_t);
 599
 600         for (i = 0; i < urb->number_of_packets; i++) {
 601                 unsigned int img, len, status;
 602                 void *pos, *sof, *eof;
 603
 604                 len = urb->iso_frame_desc[i].actual_length;
 605                 status = urb->iso_frame_desc[i].status;
 606                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 607
 608                 if (status) {
 609                         DBG(3, "Error in isochronous frame");
 610                         (*f)->state = F_ERROR;
 611                         continue;
 612                 }
 613
 614                 PDBGG("Isochrnous frame: length %u, #%u i", len, i);
 615
 616 redo:
 617                 sof = sn9c102_find_sof_header(cam, pos, len);
 618                 if (!sof) {
 619                         eof = sn9c102_find_eof_header(cam, pos, len);
 620                         if ((*f)->state == F_GRABBING) {
 621 end_of_frame:
 622                                 img = len;
 623
 624                                 if (eof)
 625                                         img = (eof > pos) ? eof - pos - 1 : 0;
 626
 627                                 if ((*f)->buf.bytesused+img > imagesize) {
 628                                         u32 b = (*f)->buf.bytesused + img -
 629                                                 imagesize;
 630                                         img = imagesize - (*f)->buf.bytesused;
 631                                         DBG(3, "Expected EOF not found: "
 632                                                "video frame cut");
 633                                         if (eof)
 634                                                 DBG(3, "Exceeded limit: +%u "
 635                                                        "bytes", (unsigned)(b));
 636                                 }
 637
 638                                 memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
 639                                        img);
 640
 641                                 if ((*f)->buf.bytesused == 0)
 642                                         do_gettimeofday(&(*f)->buf.timestamp);
 643
 644                                 (*f)->buf.bytesused += img;
 645
 646                                 if ((*f)->buf.bytesused == imagesize ||
 647                                     (cam->sensor->pix_format.pixelformat ==
 648                                                 V4L2_PIX_FMT_SN9C10X && eof)) {
 649                                         u32 b = (*f)->buf.bytesused;
 650                                         (*f)->state = F_DONE;
 651                                         (*f)->buf.sequence= ++cam->frame_count;
 652                                         spin_lock(&cam->queue_lock);
 653                                         list_move_tail(&(*f)->frame,
 654                                                        &cam->outqueue);
 655                                         if (!list_empty(&cam->inqueue))
 656                                                 (*f) = list_entry(
 657                                                         cam->inqueue.next,
 658                                                         struct sn9c102_frame_t,
 659                                                         frame );
 660                                         else
 661                                                 (*f) = NULL;
 662                                         spin_unlock(&cam->queue_lock);
 663                                         memcpy(cam->sysfs.frame_header,
 664                                                cam->sof_header, soflen);
 665                                         DBG(3, "Video frame captured: %lu "
 666                                                "bytes", (unsigned long)(b));
 667
 668                                         if (!(*f))
 669                                                 goto resubmit_urb;
 670
 671                                 } else if (eof) {
 672                                         (*f)->state = F_ERROR;
 673                                         DBG(3, "Not expected EOF after %lu "
 674                                                "bytes of image data",
 675                                             (unsigned long)
 676                                             ((*f)->buf.bytesused));
 677                                 }
 678
 679                                 if (sof) /* (1) */
 680                                         goto start_of_frame;
 681
 682                         } else if (eof) {
 683                                 DBG(3, "EOF without SOF");
 684                                 continue;
 685
 686                         } else {
 687                                 PDBGG("Ignoring pointless isochronous frame");
 688                                 continue;
 689                         }
 690
 691                 } else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
 692 start_of_frame:
 693                         (*f)->state = F_GRABBING;
 694                         (*f)->buf.bytesused = 0;
 695                         len -= (sof - pos);
 696                         pos = sof;
 697                         DBG(3, "SOF detected: new video frame");
 698                         if (len)
 699                                 goto redo;
 700
 701                 } else if ((*f)->state == F_GRABBING) {
 702                         eof = sn9c102_find_eof_header(cam, pos, len);
 703                         if (eof && eof < sof)
 704                                 goto end_of_frame; /* (1) */
 705                         else {
 706                                 if (cam->sensor->pix_format.pixelformat ==
 707                                     V4L2_PIX_FMT_SN9C10X) {
 708                                         eof = sof - soflen;
 709                                         goto end_of_frame;
 710                                 } else {
 711                                         DBG(3, "SOF before expected EOF after "
 712                                                "%lu bytes of image data",
 713                                             (unsigned long)
 714                                             ((*f)->buf.bytesused));
 715                                         goto start_of_frame;
 716                                 }
 717                         }
 718                 }
 719         }
 720
 721 resubmit_urb:
 722         urb->dev = cam->usbdev;
 723         err = usb_submit_urb(urb, GFP_ATOMIC);
 724         if (err < 0 && err != -EPERM) {
 725                 cam->state |= DEV_MISCONFIGURED;
 726                 DBG(1, "usb_submit_urb() failed");
 727         }
 728
 729         wake_up_interruptible(&cam->wait_frame);
 730 }
 731
 732
 733 static int sn9c102_start_transfer(struct sn9c102_device* cam)
 734 {
 735         struct usb_device *udev = cam->usbdev;
 736         struct urb* urb;
 737         const unsigned int sn9c102_wMaxPacketSize[] = {0, 128, 256, 384, 512,
 738                                                        680, 800, 900, 1023};
 739         const unsigned int sn9c103_wMaxPacketSize[] = {0, 128, 256, 384, 512,
 740                                                        680, 800, 900, 1003};
 741         const unsigned int psz = (cam->bridge == BRIDGE_SN9C103) ?
 742                             sn9c103_wMaxPacketSize[SN9C102_ALTERNATE_SETTING] :
 743                             sn9c102_wMaxPacketSize[SN9C102_ALTERNATE_SETTING];
 744         s8 i, j;
 745         int err = 0;
 746
 747         for (i = 0; i < SN9C102_URBS; i++) {
 748                 cam->transfer_buffer[i] = kmalloc(SN9C102_ISO_PACKETS * psz,
 749                                                   GFP_KERNEL);
 750                 if (!cam->transfer_buffer[i]) {
 751                         err = -ENOMEM;
 752                         DBG(1, "Not enough memory");
 753                         goto free_buffers;
 754                 }
 755         }
 756
 757         for (i = 0; i < SN9C102_URBS; i++) {
 758                 urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
 759                 cam->urb[i] = urb;
 760                 if (!urb) {
 761                         err = -ENOMEM;
 762                         DBG(1, "usb_alloc_urb() failed");
 763                         goto free_urbs;
 764                 }
 765                 urb->dev = udev;
 766                 urb->context = cam;
 767                 urb->pipe = usb_rcvisocpipe(udev, 1);
 768                 urb->transfer_flags = URB_ISO_ASAP;
 769                 urb->number_of_packets = SN9C102_ISO_PACKETS;
 770                 urb->complete = sn9c102_urb_complete;
 771                 urb->transfer_buffer = cam->transfer_buffer[i];
 772                 urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
 773                 urb->interval = 1;
 774                 for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
 775                         urb->iso_frame_desc[j].offset = psz * j;
 776                         urb->iso_frame_desc[j].length = psz;
 777                 }
 778         }
 779
 780         /* Enable video */
 781         if (!(cam->reg[0x01] & 0x04)) {
 782                 err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
 783                 if (err) {
 784                         err = -EIO;
 785                         DBG(1, "I/O hardware error");
 786                         goto free_urbs;
 787                 }
 788         }
 789
 790         err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
 791         if (err) {
 792                 DBG(1, "usb_set_interface() failed");
 793                 goto free_urbs;
 794         }
 795
 796         cam->frame_current = NULL;
 797
 798         for (i = 0; i < SN9C102_URBS; i++) {
 799                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 800                 if (err) {
 801                         for (j = i-1; j >= 0; j--)
 802                                 usb_kill_urb(cam->urb[j]);
 803                         DBG(1, "usb_submit_urb() failed, error %d", err);
 804                         goto free_urbs;
 805                 }
 806         }
 807
 808         return 0;
 809
 810 free_urbs:
 811         for (i = 0; (i < SN9C102_URBS) &&  cam->urb[i]; i++)
 812                 usb_free_urb(cam->urb[i]);
 813
 814 free_buffers:
 815         for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
 816                 kfree(cam->transfer_buffer[i]);
 817
 818         return err;
 819 }
 820
 821
 822 static int sn9c102_stop_transfer(struct sn9c102_device* cam)
 823 {
 824         struct usb_device *udev = cam->usbdev;
 825         s8 i;
 826         int err = 0;
 827
 828         if (cam->state & DEV_DISCONNECTED)
 829                 return 0;
 830
 831         for (i = SN9C102_URBS-1; i >= 0; i--) {
 832                 usb_kill_urb(cam->urb[i]);
 833                 usb_free_urb(cam->urb[i]);
 834                 kfree(cam->transfer_buffer[i]);
 835         }
 836
 837         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 838         if (err)
 839                 DBG(3, "usb_set_interface() failed");
 840
 841         return err;
 842 }
 843
 844
 845 static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
 846 {
 847         int err = 0;
 848
 849         cam->stream = STREAM_INTERRUPT;
 850         err = wait_event_timeout(cam->wait_stream,
 851                                  (cam->stream == STREAM_OFF) ||
 852                                  (cam->state & DEV_DISCONNECTED),
 853                                  SN9C102_URB_TIMEOUT);
 854         if (cam->state & DEV_DISCONNECTED)
 855                 return -ENODEV;
 856         else if (err) {
 857                 cam->state |= DEV_MISCONFIGURED;
 858                 DBG(1, "The camera is misconfigured. To use it, close and "
 859                        "open /dev/video%d again.", cam->v4ldev->minor);
 860                 return err;
 861         }
 862
 863         return 0;
 864 }
 865
 866 /*****************************************************************************/
 867
 868 static u8 sn9c102_strtou8(const char* buff, size_t len, ssize_t* count)
 869 {
 870         char str[5];
 871         char* endp;
 872         unsigned long val;
 873
 874         if (len < 4) {
 875                 strncpy(str, buff, len);
 876                 str[len+1] = '\0';
 877         } else {
 878                 strncpy(str, buff, 4);
 879                 str[4] = '\0';
 880         }
 881
 882         val = simple_strtoul(str, &endp, 0);
 883
 884         *count = 0;
 885         if (val <= 0xff)
 886                 *count = (ssize_t)(endp - str);
 887         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 888                 *count += 1;
 889
 890         return (u8)val;
 891 }
 892
 893 /*
 894    NOTE 1: being inside one of the following methods implies that the v4l
 895            device exists for sure (see kobjects and reference counters)
 896    NOTE 2: buffers are PAGE_SIZE long
 897 */
 898
 899 static ssize_t sn9c102_show_reg(struct class_device* cd, char* buf)
 900 {
 901         struct sn9c102_device* cam;
 902         ssize_t count;
 903
 904         if (down_interruptible(&sn9c102_sysfs_lock))
 905                 return -ERESTARTSYS;
 906
 907         cam = video_get_drvdata(to_video_device(cd));
 908         if (!cam) {
 909                 up(&sn9c102_sysfs_lock);
 910                 return -ENODEV;
 911         }
 912
 913         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 914
 915         up(&sn9c102_sysfs_lock);
 916
 917         return count;
 918 }
 919
 920
 921 static ssize_t
 922 sn9c102_store_reg(struct class_device* cd, const char* buf, size_t len)
 923 {
 924         struct sn9c102_device* cam;
 925         u8 index;
 926         ssize_t count;
 927
 928         if (down_interruptible(&sn9c102_sysfs_lock))
 929                 return -ERESTARTSYS;
 930
 931         cam = video_get_drvdata(to_video_device(cd));
 932         if (!cam) {
 933                 up(&sn9c102_sysfs_lock);
 934                 return -ENODEV;
 935         }
 936
 937         index = sn9c102_strtou8(buf, len, &count);
 938         if (index > 0x1f || !count) {
 939                 up(&sn9c102_sysfs_lock);
 940                 return -EINVAL;
 941         }
 942
 943         cam->sysfs.reg = index;
 944
 945         DBG(2, "Moved SN9C10X register index to 0x%02X", cam->sysfs.reg);
 946         DBG(3, "Written bytes: %zd", count);
 947
 948         up(&sn9c102_sysfs_lock);
 949
 950         return count;
 951 }
 952
 953
 954 static ssize_t sn9c102_show_val(struct class_device* cd, char* buf)
 955 {
 956         struct sn9c102_device* cam;
 957         ssize_t count;
 958         int val;
 959
 960         if (down_interruptible(&sn9c102_sysfs_lock))
 961                 return -ERESTARTSYS;
 962
 963         cam = video_get_drvdata(to_video_device(cd));
 964         if (!cam) {
 965                 up(&sn9c102_sysfs_lock);
 966                 return -ENODEV;
 967         }
 968
 969         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
 970                 up(&sn9c102_sysfs_lock);
 971                 return -EIO;
 972         }
 973
 974         count = sprintf(buf, "%d\n", val);
 975
 976         DBG(3, "Read bytes: %zd", count);
 977
 978         up(&sn9c102_sysfs_lock);
 979
 980         return count;
 981 }
 982
 983
 984 static ssize_t
 985 sn9c102_store_val(struct class_device* cd, const char* buf, size_t len)
 986 {
 987         struct sn9c102_device* cam;
 988         u8 value;
 989         ssize_t count;
 990         int err;
 991
 992         if (down_interruptible(&sn9c102_sysfs_lock))
 993                 return -ERESTARTSYS;
 994
 995         cam = video_get_drvdata(to_video_device(cd));
 996         if (!cam) {
 997                 up(&sn9c102_sysfs_lock);
 998                 return -ENODEV;
 999         }
1000
1001         value = sn9c102_strtou8(buf, len, &count);
1002         if (!count) {
1003                 up(&sn9c102_sysfs_lock);
1004                 return -EINVAL;
1005         }
1006
1007         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
1008         if (err) {
1009                 up(&sn9c102_sysfs_lock);
1010                 return -EIO;
1011         }
1012
1013         DBG(2, "Written SN9C10X reg. 0x%02X, val. 0x%02X",
1014             cam->sysfs.reg, value);
1015         DBG(3, "Written bytes: %zd", count);
1016
1017         up(&sn9c102_sysfs_lock);
1018
1019         return count;
1020 }
1021
1022
1023 static ssize_t sn9c102_show_i2c_reg(struct class_device* cd, char* buf)
1024 {
1025         struct sn9c102_device* cam;
1026         ssize_t count;
1027
1028         if (down_interruptible(&sn9c102_sysfs_lock))
1029                 return -ERESTARTSYS;
1030
1031         cam = video_get_drvdata(to_video_device(cd));
1032         if (!cam) {
1033                 up(&sn9c102_sysfs_lock);
1034                 return -ENODEV;
1035         }
1036
1037         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1038
1039         DBG(3, "Read bytes: %zd", count);
1040
1041         up(&sn9c102_sysfs_lock);
1042
1043         return count;
1044 }
1045
1046
1047 static ssize_t
1048 sn9c102_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
1049 {
1050         struct sn9c102_device* cam;
1051         u8 index;
1052         ssize_t count;
1053
1054         if (down_interruptible(&sn9c102_sysfs_lock))
1055                 return -ERESTARTSYS;
1056
1057         cam = video_get_drvdata(to_video_device(cd));
1058         if (!cam) {
1059                 up(&sn9c102_sysfs_lock);
1060                 return -ENODEV;
1061         }
1062
1063         index = sn9c102_strtou8(buf, len, &count);
1064         if (!count) {
1065                 up(&sn9c102_sysfs_lock);
1066                 return -EINVAL;
1067         }
1068
1069         cam->sysfs.i2c_reg = index;
1070
1071         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1072         DBG(3, "Written bytes: %zd", count);
1073
1074         up(&sn9c102_sysfs_lock);
1075
1076         return count;
1077 }
1078
1079
1080 static ssize_t sn9c102_show_i2c_val(struct class_device* cd, char* buf)
1081 {
1082         struct sn9c102_device* cam;
1083         ssize_t count;
1084         int val;
1085
1086         if (down_interruptible(&sn9c102_sysfs_lock))
1087                 return -ERESTARTSYS;
1088
1089         cam = video_get_drvdata(to_video_device(cd));
1090         if (!cam) {
1091                 up(&sn9c102_sysfs_lock);
1092                 return -ENODEV;
1093         }
1094
1095         if (!(cam->sensor->sysfs_ops & SN9C102_I2C_READ)) {
1096                 up(&sn9c102_sysfs_lock);
1097                 return -ENOSYS;
1098         }
1099
1100         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1101                 up(&sn9c102_sysfs_lock);
1102                 return -EIO;
1103         }
1104
1105         count = sprintf(buf, "%d\n", val);
1106
1107         DBG(3, "Read bytes: %zd", count);
1108
1109         up(&sn9c102_sysfs_lock);
1110
1111         return count;
1112 }
1113
1114
1115 static ssize_t
1116 sn9c102_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
1117 {
1118         struct sn9c102_device* cam;
1119         u8 value;
1120         ssize_t count;
1121         int err;
1122
1123         if (down_interruptible(&sn9c102_sysfs_lock))
1124                 return -ERESTARTSYS;
1125
1126         cam = video_get_drvdata(to_video_device(cd));
1127         if (!cam) {
1128                 up(&sn9c102_sysfs_lock);
1129                 return -ENODEV;
1130         }
1131
1132         if (!(cam->sensor->sysfs_ops & SN9C102_I2C_WRITE)) {
1133                 up(&sn9c102_sysfs_lock);
1134                 return -ENOSYS;
1135         }
1136
1137         value = sn9c102_strtou8(buf, len, &count);
1138         if (!count) {
1139                 up(&sn9c102_sysfs_lock);
1140                 return -EINVAL;
1141         }
1142
1143         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1144         if (err) {
1145                 up(&sn9c102_sysfs_lock);
1146                 return -EIO;
1147         }
1148
1149         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1150             cam->sysfs.i2c_reg, value);
1151         DBG(3, "Written bytes: %zd", count);
1152
1153         up(&sn9c102_sysfs_lock);
1154
1155         return count;
1156 }
1157
1158
1159 static ssize_t
1160 sn9c102_store_green(struct class_device* cd, const char* buf, size_t len)
1161 {
1162         struct sn9c102_device* cam;
1163         enum sn9c102_bridge bridge;
1164         ssize_t res = 0;
1165         u8 value;
1166         ssize_t count;
1167
1168         if (down_interruptible(&sn9c102_sysfs_lock))
1169                 return -ERESTARTSYS;
1170
1171         cam = video_get_drvdata(to_video_device(cd));
1172         if (!cam) {
1173                 up(&sn9c102_sysfs_lock);
1174                 return -ENODEV;
1175         }
1176
1177         bridge = cam->bridge;
1178
1179         up(&sn9c102_sysfs_lock);
1180
1181         value = sn9c102_strtou8(buf, len, &count);
1182         if (!count)
1183                 return -EINVAL;
1184
1185         switch (bridge) {
1186         case BRIDGE_SN9C101:
1187         case BRIDGE_SN9C102:
1188                 if (value > 0x0f)
1189                         return -EINVAL;
1190                 if ((res = sn9c102_store_reg(cd, "0x11", 4)) >= 0)
1191                         res = sn9c102_store_val(cd, buf, len);
1192                 break;
1193         case BRIDGE_SN9C103:
1194                 if (value > 0x7f)
1195                         return -EINVAL;
1196                 if ((res = sn9c102_store_reg(cd, "0x04", 4)) >= 0)
1197                         res = sn9c102_store_val(cd, buf, len);
1198                 break;
1199         }
1200
1201         return res;
1202 }
1203
1204
1205 static ssize_t
1206 sn9c102_store_blue(struct class_device* cd, const char* buf, size_t len)
1207 {
1208         ssize_t res = 0;
1209         u8 value;
1210         ssize_t count;
1211
1212         value = sn9c102_strtou8(buf, len, &count);
1213         if (!count || value > 0x7f)
1214                 return -EINVAL;
1215
1216         if ((res = sn9c102_store_reg(cd, "0x06", 4)) >= 0)
1217                 res = sn9c102_store_val(cd, buf, len);
1218
1219         return res;
1220 }
1221
1222
1223 static ssize_t
1224 sn9c102_store_red(struct class_device* cd, const char* buf, size_t len)
1225 {
1226         ssize_t res = 0;
1227         u8 value;
1228         ssize_t count;
1229
1230         value = sn9c102_strtou8(buf, len, &count);
1231         if (!count || value > 0x7f)
1232                 return -EINVAL;
1233
1234         if ((res = sn9c102_store_reg(cd, "0x05", 4)) >= 0)
1235                 res = sn9c102_store_val(cd, buf, len);
1236
1237         return res;
1238 }
1239
1240
1241 static ssize_t sn9c102_show_frame_header(struct class_device* cd, char* buf)
1242 {
1243         struct sn9c102_device* cam;
1244         ssize_t count;
1245
1246         cam = video_get_drvdata(to_video_device(cd));
1247         if (!cam)
1248                 return -ENODEV;
1249
1250         count = sizeof(cam->sysfs.frame_header);
1251         memcpy(buf, cam->sysfs.frame_header, count);
1252
1253         DBG(3, "Frame header, read bytes: %zd", count);
1254
1255         return count;
1256 }
1257
1258
1259 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
1260                          sn9c102_show_reg, sn9c102_store_reg);
1261 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
1262                          sn9c102_show_val, sn9c102_store_val);
1263 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1264                          sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1265 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1266                          sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1267 static CLASS_DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
1268 static CLASS_DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
1269 static CLASS_DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
1270 static CLASS_DEVICE_ATTR(frame_header, S_IRUGO,
1271                          sn9c102_show_frame_header, NULL);
1272
1273
1274 static void sn9c102_create_sysfs(struct sn9c102_device* cam)
1275 {
1276         struct video_device *v4ldev = cam->v4ldev;
1277
1278         video_device_create_file(v4ldev, &class_device_attr_reg);
1279         video_device_create_file(v4ldev, &class_device_attr_val);
1280         video_device_create_file(v4ldev, &class_device_attr_frame_header);
1281         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
1282                 video_device_create_file(v4ldev, &class_device_attr_green);
1283         else if (cam->bridge == BRIDGE_SN9C103) {
1284                 video_device_create_file(v4ldev, &class_device_attr_blue);
1285                 video_device_create_file(v4ldev, &class_device_attr_red);
1286         }
1287         if (cam->sensor && cam->sensor->sysfs_ops) {
1288                 video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
1289                 video_device_create_file(v4ldev, &class_device_attr_i2c_val);
1290         }
1291 }
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                 init_MUTEX(&cam->fileop_sem);
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         down(&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         up(&sn9c102_sysfs_lock);
1466
1467         kfree(cam->control_buffer);
1468 }
1469
1470 /*****************************************************************************/
1471
1472 static int sn9c102_open(struct inode* inode, struct file* filp)
1473 {
1474         struct sn9c102_device* cam;
1475         int err = 0;
1476
1477         /*
1478            This is the only safe way to prevent race conditions with
1479            disconnect
1480         */
1481         if (!down_read_trylock(&sn9c102_disconnect))
1482                 return -ERESTARTSYS;
1483
1484         cam = video_get_drvdata(video_devdata(filp));
1485
1486         if (down_interruptible(&cam->dev_sem)) {
1487                 up_read(&sn9c102_disconnect);
1488                 return -ERESTARTSYS;
1489         }
1490
1491         if (cam->users) {
1492                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1493                 if ((filp->f_flags & O_NONBLOCK) ||
1494                     (filp->f_flags & O_NDELAY)) {
1495                         err = -EWOULDBLOCK;
1496                         goto out;
1497                 }
1498                 up(&cam->dev_sem);
1499                 err = wait_event_interruptible_exclusive(cam->open,
1500                                                   cam->state & DEV_DISCONNECTED
1501                                                          || !cam->users);
1502                 if (err) {
1503                         up_read(&sn9c102_disconnect);
1504                         return err;
1505                 }
1506                 if (cam->state & DEV_DISCONNECTED) {
1507                         up_read(&sn9c102_disconnect);
1508                         return -ENODEV;
1509                 }
1510                 down(&cam->dev_sem);
1511         }
1512
1513
1514         if (cam->state & DEV_MISCONFIGURED) {
1515                 err = sn9c102_init(cam);
1516                 if (err) {
1517                         DBG(1, "Initialization failed again. "
1518                                "I will retry on next open().");
1519                         goto out;
1520                 }
1521                 cam->state &= ~DEV_MISCONFIGURED;
1522         }
1523
1524         if ((err = sn9c102_start_transfer(cam)))
1525                 goto out;
1526
1527         filp->private_data = cam;
1528         cam->users++;
1529         cam->io = IO_NONE;
1530         cam->stream = STREAM_OFF;
1531         cam->nbuffers = 0;
1532         cam->frame_count = 0;
1533         sn9c102_empty_framequeues(cam);
1534
1535         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1536
1537 out:
1538         up(&cam->dev_sem);
1539         up_read(&sn9c102_disconnect);
1540         return err;
1541 }
1542
1543
1544 static int sn9c102_release(struct inode* inode, struct file* filp)
1545 {
1546         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1547
1548         down(&cam->dev_sem); /* prevent disconnect() to be called */
1549
1550         sn9c102_stop_transfer(cam);
1551
1552         sn9c102_release_buffers(cam);
1553
1554         if (cam->state & DEV_DISCONNECTED) {
1555                 sn9c102_release_resources(cam);
1556                 up(&cam->dev_sem);
1557                 kfree(cam);
1558                 return 0;
1559         }
1560
1561         cam->users--;
1562         wake_up_interruptible_nr(&cam->open, 1);
1563
1564         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1565
1566         up(&cam->dev_sem);
1567
1568         return 0;
1569 }
1570
1571
1572 static ssize_t
1573 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1574 {
1575         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1576         struct sn9c102_frame_t* f, * i;
1577         unsigned long lock_flags;
1578         int err = 0;
1579
1580         if (down_interruptible(&cam->fileop_sem))
1581                 return -ERESTARTSYS;
1582
1583         if (cam->state & DEV_DISCONNECTED) {
1584                 DBG(1, "Device not present");
1585                 up(&cam->fileop_sem);
1586                 return -ENODEV;
1587         }
1588
1589         if (cam->state & DEV_MISCONFIGURED) {
1590                 DBG(1, "The camera is misconfigured. Close and open it "
1591                        "again.");
1592                 up(&cam->fileop_sem);
1593                 return -EIO;
1594         }
1595
1596         if (cam->io == IO_MMAP) {
1597                 DBG(3, "Close and open the device again to choose "
1598                        "the read method");
1599                 up(&cam->fileop_sem);
1600                 return -EINVAL;
1601         }
1602
1603         if (cam->io == IO_NONE) {
1604                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1605                         DBG(1, "read() failed, not enough memory");
1606                         up(&cam->fileop_sem);
1607                         return -ENOMEM;
1608                 }
1609                 cam->io = IO_READ;
1610                 cam->stream = STREAM_ON;
1611         }
1612
1613         if (list_empty(&cam->inqueue)) {
1614                 if (!list_empty(&cam->outqueue))
1615                         sn9c102_empty_framequeues(cam);
1616                 sn9c102_queue_unusedframes(cam);
1617         }
1618
1619         if (!count) {
1620                 up(&cam->fileop_sem);
1621                 return 0;
1622         }
1623
1624         if (list_empty(&cam->outqueue)) {
1625                 if (filp->f_flags & O_NONBLOCK) {
1626                         up(&cam->fileop_sem);
1627                         return -EAGAIN;
1628                 }
1629                 err = wait_event_interruptible
1630                       ( cam->wait_frame,
1631                         (!list_empty(&cam->outqueue)) ||
1632                         (cam->state & DEV_DISCONNECTED) ||
1633                         (cam->state & DEV_MISCONFIGURED) );
1634                 if (err) {
1635                         up(&cam->fileop_sem);
1636                         return err;
1637                 }
1638                 if (cam->state & DEV_DISCONNECTED) {
1639                         up(&cam->fileop_sem);
1640                         return -ENODEV;
1641                 }
1642                 if (cam->state & DEV_MISCONFIGURED) {
1643                         up(&cam->fileop_sem);
1644                         return -EIO;
1645                 }
1646         }
1647
1648         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1649
1650         if (count > f->buf.bytesused)
1651                 count = f->buf.bytesused;
1652
1653         if (copy_to_user(buf, f->bufmem, count)) {
1654                 err = -EFAULT;
1655                 goto exit;
1656         }
1657         *f_pos += count;
1658
1659 exit:
1660         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1661         list_for_each_entry(i, &cam->outqueue, frame)
1662                 i->state = F_UNUSED;
1663         INIT_LIST_HEAD(&cam->outqueue);
1664         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1665
1666         sn9c102_queue_unusedframes(cam);
1667
1668         PDBGG("Frame #%lu, bytes read: %zu",
1669               (unsigned long)f->buf.index, count);
1670
1671         up(&cam->fileop_sem);
1672
1673         return count;
1674 }
1675
1676
1677 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
1678 {
1679         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1680         struct sn9c102_frame_t* f;
1681         unsigned long lock_flags;
1682         unsigned int mask = 0;
1683
1684         if (down_interruptible(&cam->fileop_sem))
1685                 return POLLERR;
1686
1687         if (cam->state & DEV_DISCONNECTED) {
1688                 DBG(1, "Device not present");
1689                 goto error;
1690         }
1691
1692         if (cam->state & DEV_MISCONFIGURED) {
1693                 DBG(1, "The camera is misconfigured. Close and open it "
1694                        "again.");
1695                 goto error;
1696         }
1697
1698         if (cam->io == IO_NONE) {
1699                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
1700                                              IO_READ)) {
1701                         DBG(1, "poll() failed, not enough memory");
1702                         goto error;
1703                 }
1704                 cam->io = IO_READ;
1705                 cam->stream = STREAM_ON;
1706         }
1707
1708         if (cam->io == IO_READ) {
1709                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1710                 list_for_each_entry(f, &cam->outqueue, frame)
1711                         f->state = F_UNUSED;
1712                 INIT_LIST_HEAD(&cam->outqueue);
1713                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1714                 sn9c102_queue_unusedframes(cam);
1715         }
1716
1717         poll_wait(filp, &cam->wait_frame, wait);
1718
1719         if (!list_empty(&cam->outqueue))
1720                 mask |= POLLIN | POLLRDNORM;
1721
1722         up(&cam->fileop_sem);
1723
1724         return mask;
1725
1726 error:
1727         up(&cam->fileop_sem);
1728         return POLLERR;
1729 }
1730
1731
1732 static void sn9c102_vm_open(struct vm_area_struct* vma)
1733 {
1734         struct sn9c102_frame_t* f = vma->vm_private_data;
1735         f->vma_use_count++;
1736 }
1737
1738
1739 static void sn9c102_vm_close(struct vm_area_struct* vma)
1740 {
1741         /* NOTE: buffers are not freed here */
1742         struct sn9c102_frame_t* f = vma->vm_private_data;
1743         f->vma_use_count--;
1744 }
1745
1746
1747 static struct vm_operations_struct sn9c102_vm_ops = {
1748         .open = sn9c102_vm_open,
1749         .close = sn9c102_vm_close,
1750 };
1751
1752
1753 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
1754 {
1755         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
1756         unsigned long size = vma->vm_end - vma->vm_start,
1757                       start = vma->vm_start,
1758                       pos,
1759                       page;
1760         u32 i;
1761
1762         if (down_interruptible(&cam->fileop_sem))
1763                 return -ERESTARTSYS;
1764
1765         if (cam->state & DEV_DISCONNECTED) {
1766                 DBG(1, "Device not present");
1767                 up(&cam->fileop_sem);
1768                 return -ENODEV;
1769         }
1770
1771         if (cam->state & DEV_MISCONFIGURED) {
1772                 DBG(1, "The camera is misconfigured. Close and open it "
1773                        "again.");
1774                 up(&cam->fileop_sem);
1775                 return -EIO;
1776         }
1777
1778         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1779             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1780                 up(&cam->fileop_sem);
1781                 return -EINVAL;
1782         }
1783
1784         for (i = 0; i < cam->nbuffers; i++) {
1785                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1786                         break;
1787         }
1788         if (i == cam->nbuffers) {
1789                 up(&cam->fileop_sem);
1790                 return -EINVAL;
1791         }
1792
1793         /* VM_IO is eventually going to replace PageReserved altogether */
1794         vma->vm_flags |= VM_IO;
1795         vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
1796
1797         pos = (unsigned long)cam->frame[i].bufmem;
1798         while (size > 0) { /* size is page-aligned */
1799                 page = vmalloc_to_pfn((void *)pos);
1800                 if (remap_pfn_range(vma, start, page, PAGE_SIZE,
1801                                     vma->vm_page_prot)) {
1802                         up(&cam->fileop_sem);
1803                         return -EAGAIN;
1804                 }
1805                 start += PAGE_SIZE;
1806                 pos += PAGE_SIZE;
1807                 size -= PAGE_SIZE;
1808         }
1809
1810         vma->vm_ops = &sn9c102_vm_ops;
1811         vma->vm_private_data = &cam->frame[i];
1812
1813         sn9c102_vm_open(vma);
1814
1815         up(&cam->fileop_sem);
1816
1817         return 0;
1818 }
1819
1820 /*****************************************************************************/
1821
1822 static int
1823 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
1824 {
1825         struct v4l2_capability cap = {
1826                 .driver = "sn9c102",
1827                 .version = SN9C102_MODULE_VERSION_CODE,
1828                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1829                                 V4L2_CAP_STREAMING,
1830         };
1831
1832         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1833         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1834                 strlcpy(cap.bus_info, cam->dev.bus_id, sizeof(cap.bus_info));
1835
1836         if (copy_to_user(arg, &cap, sizeof(cap)))
1837                 return -EFAULT;
1838
1839         return 0;
1840 }
1841
1842
1843 static int
1844 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
1845 {
1846         struct v4l2_input i;
1847
1848         if (copy_from_user(&i, arg, sizeof(i)))
1849                 return -EFAULT;
1850
1851         if (i.index)
1852                 return -EINVAL;
1853
1854         memset(&i, 0, sizeof(i));
1855         strcpy(i.name, "USB");
1856
1857         if (copy_to_user(arg, &i, sizeof(i)))
1858                 return -EFAULT;
1859
1860         return 0;
1861 }
1862
1863
1864 static int
1865 sn9c102_vidioc_gs_input(struct sn9c102_device* cam, void __user * arg)
1866 {
1867         int index;
1868
1869         if (copy_from_user(&index, arg, sizeof(index)))
1870                 return -EFAULT;
1871
1872         if (index != 0)
1873                 return -EINVAL;
1874
1875         return 0;
1876 }
1877
1878
1879 static int
1880 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
1881 {
1882         struct sn9c102_sensor* s = cam->sensor;
1883         struct v4l2_queryctrl qc;
1884         u8 i;
1885
1886         if (copy_from_user(&qc, arg, sizeof(qc)))
1887                 return -EFAULT;
1888
1889         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1890                 if (qc.id && qc.id == s->qctrl[i].id) {
1891                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1892                         if (copy_to_user(arg, &qc, sizeof(qc)))
1893                                 return -EFAULT;
1894                         return 0;
1895                 }
1896
1897         return -EINVAL;
1898 }
1899
1900
1901 static int
1902 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
1903 {
1904         struct sn9c102_sensor* s = cam->sensor;
1905         struct v4l2_control ctrl;
1906         int err = 0;
1907         u8 i;
1908
1909         if (!s->get_ctrl && !s->set_ctrl)
1910                 return -EINVAL;
1911
1912         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1913                 return -EFAULT;
1914
1915         if (!s->get_ctrl) {
1916                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1917                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
1918                                 ctrl.value = s->_qctrl[i].default_value;
1919                                 goto exit;
1920                         }
1921                 return -EINVAL;
1922         } else
1923                 err = s->get_ctrl(cam, &ctrl);
1924
1925 exit:
1926         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1927                 return -EFAULT;
1928
1929         return err;
1930 }
1931
1932
1933 static int
1934 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
1935 {
1936         struct sn9c102_sensor* s = cam->sensor;
1937         struct v4l2_control ctrl;
1938         u8 i;
1939         int err = 0;
1940
1941         if (!s->set_ctrl)
1942                 return -EINVAL;
1943
1944         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1945                 return -EFAULT;
1946
1947         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1948                 if (ctrl.id == s->qctrl[i].id) {
1949                         if (ctrl.value < s->qctrl[i].minimum ||
1950                             ctrl.value > s->qctrl[i].maximum)
1951                                 return -ERANGE;
1952                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1953                         break;
1954                 }
1955
1956         if ((err = s->set_ctrl(cam, &ctrl)))
1957                 return err;
1958
1959         s->_qctrl[i].default_value = ctrl.value;
1960
1961         PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
1962               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
1963
1964         return 0;
1965 }
1966
1967
1968 static int
1969 sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
1970 {
1971         struct v4l2_cropcap* cc = &(cam->sensor->cropcap);
1972
1973         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1974         cc->pixelaspect.numerator = 1;
1975         cc->pixelaspect.denominator = 1;
1976
1977         if (copy_to_user(arg, cc, sizeof(*cc)))
1978                 return -EFAULT;
1979
1980         return 0;
1981 }
1982
1983
1984 static int
1985 sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
1986 {
1987         struct sn9c102_sensor* s = cam->sensor;
1988         struct v4l2_crop crop = {
1989                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1990         };
1991
1992         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1993
1994         if (copy_to_user(arg, &crop, sizeof(crop)))
1995                 return -EFAULT;
1996
1997         return 0;
1998 }
1999
2000
2001 static int
2002 sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
2003 {
2004         struct sn9c102_sensor* s = cam->sensor;
2005         struct v4l2_crop crop;
2006         struct v4l2_rect* rect;
2007         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2008         struct v4l2_pix_format* pix_format = &(s->pix_format);
2009         u8 scale;
2010         const enum sn9c102_stream_state stream = cam->stream;
2011         const u32 nbuffers = cam->nbuffers;
2012         u32 i;
2013         int err = 0;
2014
2015         if (copy_from_user(&crop, arg, sizeof(crop)))
2016                 return -EFAULT;
2017
2018         rect = &(crop.c);
2019
2020         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2021                 return -EINVAL;
2022
2023         if (cam->module_param.force_munmap)
2024                 for (i = 0; i < cam->nbuffers; i++)
2025                         if (cam->frame[i].vma_use_count) {
2026                                 DBG(3, "VIDIOC_S_CROP failed. "
2027                                        "Unmap the buffers first.");
2028                                 return -EINVAL;
2029                         }
2030
2031         /* Preserve R,G or B origin */
2032         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
2033         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
2034
2035         if (rect->width < 16)
2036                 rect->width = 16;
2037         if (rect->height < 16)
2038                 rect->height = 16;
2039         if (rect->width > bounds->width)
2040                 rect->width = bounds->width;
2041         if (rect->height > bounds->height)
2042                 rect->height = bounds->height;
2043         if (rect->left < bounds->left)
2044                 rect->left = bounds->left;
2045         if (rect->top < bounds->top)
2046                 rect->top = bounds->top;
2047         if (rect->left + rect->width > bounds->left + bounds->width)
2048                 rect->left = bounds->left+bounds->width - rect->width;
2049         if (rect->top + rect->height > bounds->top + bounds->height)
2050                 rect->top = bounds->top+bounds->height - rect->height;
2051
2052         rect->width &= ~15L;
2053         rect->height &= ~15L;
2054
2055         if (SN9C102_PRESERVE_IMGSCALE) {
2056                 /* Calculate the actual scaling factor */
2057                 u32 a, b;
2058                 a = rect->width * rect->height;
2059                 b = pix_format->width * pix_format->height;
2060                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2061         } else
2062                 scale = 1;
2063
2064         if (cam->stream == STREAM_ON)
2065                 if ((err = sn9c102_stream_interrupt(cam)))
2066                         return err;
2067
2068         if (copy_to_user(arg, &crop, sizeof(crop))) {
2069                 cam->stream = stream;
2070                 return -EFAULT;
2071         }
2072
2073         if (cam->module_param.force_munmap || cam->io == IO_READ)
2074                 sn9c102_release_buffers(cam);
2075
2076         err = sn9c102_set_crop(cam, rect);
2077         if (s->set_crop)
2078                 err += s->set_crop(cam, rect);
2079         err += sn9c102_set_scale(cam, scale);
2080
2081         if (err) { /* atomic, no rollback in ioctl() */
2082                 cam->state |= DEV_MISCONFIGURED;
2083                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
2084                        "use the camera, close and open /dev/video%d again.",
2085                     cam->v4ldev->minor);
2086                 return -EIO;
2087         }
2088
2089         s->pix_format.width = rect->width/scale;
2090         s->pix_format.height = rect->height/scale;
2091         memcpy(&(s->_rect), rect, sizeof(*rect));
2092
2093         if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
2094             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2095                 cam->state |= DEV_MISCONFIGURED;
2096                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
2097                        "use the camera, close and open /dev/video%d again.",
2098                     cam->v4ldev->minor);
2099                 return -ENOMEM;
2100         }
2101
2102         if (cam->io == IO_READ)
2103                 sn9c102_empty_framequeues(cam);
2104         else if (cam->module_param.force_munmap)
2105                 sn9c102_requeue_outqueue(cam);
2106
2107         cam->stream = stream;
2108
2109         return 0;
2110 }
2111
2112
2113 static int
2114 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2115 {
2116         struct v4l2_fmtdesc fmtd;
2117
2118         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2119                 return -EFAULT;
2120
2121         if (fmtd.index == 0) {
2122                 strcpy(fmtd.description, "bayer rgb");
2123                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2124         } else if (fmtd.index == 1) {
2125                 strcpy(fmtd.description, "compressed");
2126                 fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2127                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2128         } else
2129                 return -EINVAL;
2130
2131         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2132         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2133
2134         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2135                 return -EFAULT;
2136
2137         return 0;
2138 }
2139
2140
2141 static int
2142 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2143 {
2144         struct v4l2_format format;
2145         struct v4l2_pix_format* pfmt = &(cam->sensor->pix_format);
2146
2147         if (copy_from_user(&format, arg, sizeof(format)))
2148                 return -EFAULT;
2149
2150         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2151                 return -EINVAL;
2152
2153         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_SN9C10X)
2154                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2155         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2156         pfmt->field = V4L2_FIELD_NONE;
2157         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2158
2159         if (copy_to_user(arg, &format, sizeof(format)))
2160                 return -EFAULT;
2161
2162         return 0;
2163 }
2164
2165
2166 static int
2167 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2168                          void __user * arg)
2169 {
2170         struct sn9c102_sensor* s = cam->sensor;
2171         struct v4l2_format format;
2172         struct v4l2_pix_format* pix;
2173         struct v4l2_pix_format* pfmt = &(s->pix_format);
2174         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2175         struct v4l2_rect rect;
2176         u8 scale;
2177         const enum sn9c102_stream_state stream = cam->stream;
2178         const u32 nbuffers = cam->nbuffers;
2179         u32 i;
2180         int err = 0;
2181
2182         if (copy_from_user(&format, arg, sizeof(format)))
2183                 return -EFAULT;
2184
2185         pix = &(format.fmt.pix);
2186
2187         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2188                 return -EINVAL;
2189
2190         memcpy(&rect, &(s->_rect), sizeof(rect));
2191
2192         { /* calculate the actual scaling factor */
2193                 u32 a, b;
2194                 a = rect.width * rect.height;
2195                 b = pix->width * pix->height;
2196                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2197         }
2198
2199         rect.width = scale * pix->width;
2200         rect.height = scale * pix->height;
2201
2202         if (rect.width < 16)
2203                 rect.width = 16;
2204         if (rect.height < 16)
2205                 rect.height = 16;
2206         if (rect.width > bounds->left + bounds->width - rect.left)
2207                 rect.width = bounds->left + bounds->width - rect.left;
2208         if (rect.height > bounds->top + bounds->height - rect.top)
2209                 rect.height = bounds->top + bounds->height - rect.top;
2210
2211         rect.width &= ~15L;
2212         rect.height &= ~15L;
2213
2214         { /* adjust the scaling factor */
2215                 u32 a, b;
2216                 a = rect.width * rect.height;
2217                 b = pix->width * pix->height;
2218                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2219         }
2220
2221         pix->width = rect.width / scale;
2222         pix->height = rect.height / scale;
2223
2224         if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2225             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2226                 pix->pixelformat = pfmt->pixelformat;
2227         pix->priv = pfmt->priv; /* bpp */
2228         pix->colorspace = pfmt->colorspace;
2229         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
2230                             ? 0 : (pix->width * pix->priv) / 8;
2231         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2232         pix->field = V4L2_FIELD_NONE;
2233
2234         if (cmd == VIDIOC_TRY_FMT) {
2235                 if (copy_to_user(arg, &format, sizeof(format)))
2236                         return -EFAULT;
2237                 return 0;
2238         }
2239
2240         if (cam->module_param.force_munmap)
2241                 for (i = 0; i < cam->nbuffers; i++)
2242                         if (cam->frame[i].vma_use_count) {
2243                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2244                                        "buffers first.");
2245                                 return -EINVAL;
2246                         }
2247
2248         if (cam->stream == STREAM_ON)
2249                 if ((err = sn9c102_stream_interrupt(cam)))
2250                         return err;
2251
2252         if (copy_to_user(arg, &format, sizeof(format))) {
2253                 cam->stream = stream;
2254                 return -EFAULT;
2255         }
2256
2257         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2258                 sn9c102_release_buffers(cam);
2259
2260         err += sn9c102_set_pix_format(cam, pix);
2261         err += sn9c102_set_crop(cam, &rect);
2262         if (s->set_pix_format)
2263                 err += s->set_pix_format(cam, pix);
2264         if (s->set_crop)
2265                 err += s->set_crop(cam, &rect);
2266         err += sn9c102_set_scale(cam, scale);
2267
2268         if (err) { /* atomic, no rollback in ioctl() */
2269                 cam->state |= DEV_MISCONFIGURED;
2270                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2271                        "use the camera, close and open /dev/video%d again.",
2272                     cam->v4ldev->minor);
2273                 return -EIO;
2274         }
2275
2276         memcpy(pfmt, pix, sizeof(*pix));
2277         memcpy(&(s->_rect), &rect, sizeof(rect));
2278
2279         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2280             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2281                 cam->state |= DEV_MISCONFIGURED;
2282                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2283                        "use the camera, close and open /dev/video%d again.",
2284                     cam->v4ldev->minor);
2285                 return -ENOMEM;
2286         }
2287
2288         if (cam->io == IO_READ)
2289                 sn9c102_empty_framequeues(cam);
2290         else if (cam->module_param.force_munmap)
2291                 sn9c102_requeue_outqueue(cam);
2292
2293         cam->stream = stream;
2294
2295         return 0;
2296 }
2297
2298
2299 static int
2300 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2301 {
2302         if (copy_to_user(arg, &cam->compression,
2303                          sizeof(cam->compression)))
2304                 return -EFAULT;
2305
2306         return 0;
2307 }
2308
2309
2310 static int
2311 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2312 {
2313         struct v4l2_jpegcompression jc;
2314         const enum sn9c102_stream_state stream = cam->stream;
2315         int err = 0;
2316
2317         if (copy_from_user(&jc, arg, sizeof(jc)))
2318                 return -EFAULT;
2319
2320         if (jc.quality != 0 && jc.quality != 1)
2321                 return -EINVAL;
2322
2323         if (cam->stream == STREAM_ON)
2324                 if ((err = sn9c102_stream_interrupt(cam)))
2325                         return err;
2326
2327         err += sn9c102_set_compression(cam, &jc);
2328         if (err) { /* atomic, no rollback in ioctl() */
2329                 cam->state |= DEV_MISCONFIGURED;
2330                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2331                        "problems. To use the camera, close and open "
2332                        "/dev/video%d again.", cam->v4ldev->minor);
2333                 return -EIO;
2334         }
2335
2336         cam->compression.quality = jc.quality;
2337
2338         cam->stream = stream;
2339
2340         return 0;
2341 }
2342
2343
2344 static int
2345 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2346 {
2347         struct v4l2_requestbuffers rb;
2348         u32 i;
2349         int err;
2350
2351         if (copy_from_user(&rb, arg, sizeof(rb)))
2352                 return -EFAULT;
2353
2354         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2355             rb.memory != V4L2_MEMORY_MMAP)
2356                 return -EINVAL;
2357
2358         if (cam->io == IO_READ) {
2359                 DBG(3, "Close and open the device again to choose the mmap "
2360                        "I/O method");
2361                 return -EINVAL;
2362         }
2363
2364         for (i = 0; i < cam->nbuffers; i++)
2365                 if (cam->frame[i].vma_use_count) {
2366                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2367                                "still mapped.");
2368                         return -EINVAL;
2369                 }
2370
2371         if (cam->stream == STREAM_ON)
2372                 if ((err = sn9c102_stream_interrupt(cam)))
2373                         return err;
2374
2375         sn9c102_empty_framequeues(cam);
2376
2377         sn9c102_release_buffers(cam);
2378         if (rb.count)
2379                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2380
2381         if (copy_to_user(arg, &rb, sizeof(rb))) {
2382                 sn9c102_release_buffers(cam);
2383                 cam->io = IO_NONE;
2384                 return -EFAULT;
2385         }
2386
2387         cam->io = rb.count ? IO_MMAP : IO_NONE;
2388
2389         return 0;
2390 }
2391
2392
2393 static int
2394 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2395 {
2396         struct v4l2_buffer b;
2397
2398         if (copy_from_user(&b, arg, sizeof(b)))
2399                 return -EFAULT;
2400
2401         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2402             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2403                 return -EINVAL;
2404
2405         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2406
2407         if (cam->frame[b.index].vma_use_count)
2408                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2409
2410         if (cam->frame[b.index].state == F_DONE)
2411                 b.flags |= V4L2_BUF_FLAG_DONE;
2412         else if (cam->frame[b.index].state != F_UNUSED)
2413                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2414
2415         if (copy_to_user(arg, &b, sizeof(b)))
2416                 return -EFAULT;
2417
2418         return 0;
2419 }
2420
2421
2422 static int
2423 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2424 {
2425         struct v4l2_buffer b;
2426         unsigned long lock_flags;
2427
2428         if (copy_from_user(&b, arg, sizeof(b)))
2429                 return -EFAULT;
2430
2431         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2432             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2433                 return -EINVAL;
2434
2435         if (cam->frame[b.index].state != F_UNUSED)
2436                 return -EINVAL;
2437
2438         cam->frame[b.index].state = F_QUEUED;
2439
2440         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2441         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2442         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2443
2444         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2445
2446         return 0;
2447 }
2448
2449
2450 static int
2451 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2452                      void __user * arg)
2453 {
2454         struct v4l2_buffer b;
2455         struct sn9c102_frame_t *f;
2456         unsigned long lock_flags;
2457         int err = 0;
2458
2459         if (copy_from_user(&b, arg, sizeof(b)))
2460                 return -EFAULT;
2461
2462         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2463                 return -EINVAL;
2464
2465         if (list_empty(&cam->outqueue)) {
2466                 if (cam->stream == STREAM_OFF)
2467                         return -EINVAL;
2468                 if (filp->f_flags & O_NONBLOCK)
2469                         return -EAGAIN;
2470                 err = wait_event_interruptible
2471                       ( cam->wait_frame,
2472                         (!list_empty(&cam->outqueue)) ||
2473                         (cam->state & DEV_DISCONNECTED) ||
2474                         (cam->state & DEV_MISCONFIGURED) );
2475                 if (err)
2476                         return err;
2477                 if (cam->state & DEV_DISCONNECTED)
2478                         return -ENODEV;
2479                 if (cam->state & DEV_MISCONFIGURED)
2480                         return -EIO;
2481         }
2482
2483         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2484         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2485         list_del(cam->outqueue.next);
2486         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2487
2488         f->state = F_UNUSED;
2489
2490         memcpy(&b, &f->buf, sizeof(b));
2491         if (f->vma_use_count)
2492                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2493
2494         if (copy_to_user(arg, &b, sizeof(b)))
2495                 return -EFAULT;
2496
2497         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2498
2499         return 0;
2500 }
2501
2502
2503 static int
2504 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2505 {
2506         int type;
2507
2508         if (copy_from_user(&type, arg, sizeof(type)))
2509                 return -EFAULT;
2510
2511         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2512                 return -EINVAL;
2513
2514         if (list_empty(&cam->inqueue))
2515                 return -EINVAL;
2516
2517         cam->stream = STREAM_ON;
2518
2519         DBG(3, "Stream on");
2520
2521         return 0;
2522 }
2523
2524
2525 static int
2526 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2527 {
2528         int type, err;
2529
2530         if (copy_from_user(&type, arg, sizeof(type)))
2531                 return -EFAULT;
2532
2533         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2534                 return -EINVAL;
2535
2536         if (cam->stream == STREAM_ON)
2537                 if ((err = sn9c102_stream_interrupt(cam)))
2538                         return err;
2539
2540         sn9c102_empty_framequeues(cam);
2541
2542         DBG(3, "Stream off");
2543
2544         return 0;
2545 }
2546
2547
2548 static int
2549 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2550 {
2551         struct v4l2_streamparm sp;
2552
2553         if (copy_from_user(&sp, arg, sizeof(sp)))
2554                 return -EFAULT;
2555
2556         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2557                 return -EINVAL;
2558
2559         sp.parm.capture.extendedmode = 0;
2560         sp.parm.capture.readbuffers = cam->nreadbuffers;
2561
2562         if (copy_to_user(arg, &sp, sizeof(sp)))
2563                 return -EFAULT;
2564
2565         return 0;
2566 }
2567
2568
2569 static int
2570 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
2571 {
2572         struct v4l2_streamparm sp;
2573
2574         if (copy_from_user(&sp, arg, sizeof(sp)))
2575                 return -EFAULT;
2576
2577         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2578                 return -EINVAL;
2579
2580         sp.parm.capture.extendedmode = 0;
2581
2582         if (sp.parm.capture.readbuffers == 0)
2583                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2584
2585         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
2586                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
2587
2588         if (copy_to_user(arg, &sp, sizeof(sp)))
2589                 return -EFAULT;
2590
2591         cam->nreadbuffers = sp.parm.capture.readbuffers;
2592
2593         return 0;
2594 }
2595
2596
2597 static int sn9c102_ioctl_v4l2(struct inode* inode, struct file* filp,
2598                               unsigned int cmd, void __user * arg)
2599 {
2600         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2601
2602         switch (cmd) {
2603
2604         case VIDIOC_QUERYCAP:
2605                 return sn9c102_vidioc_querycap(cam, arg);
2606
2607         case VIDIOC_ENUMINPUT:
2608                 return sn9c102_vidioc_enuminput(cam, arg);
2609
2610         case VIDIOC_G_INPUT:
2611         case VIDIOC_S_INPUT:
2612                 return sn9c102_vidioc_gs_input(cam, arg);
2613
2614         case VIDIOC_QUERYCTRL:
2615                 return sn9c102_vidioc_query_ctrl(cam, arg);
2616
2617         case VIDIOC_G_CTRL:
2618                 return sn9c102_vidioc_g_ctrl(cam, arg);
2619
2620         case VIDIOC_S_CTRL_OLD:
2621         case VIDIOC_S_CTRL:
2622                 return sn9c102_vidioc_s_ctrl(cam, arg);
2623
2624         case VIDIOC_CROPCAP_OLD:
2625         case VIDIOC_CROPCAP:
2626                 return sn9c102_vidioc_cropcap(cam, arg);
2627
2628         case VIDIOC_G_CROP:
2629                 return sn9c102_vidioc_g_crop(cam, arg);
2630
2631         case VIDIOC_S_CROP:
2632                 return sn9c102_vidioc_s_crop(cam, arg);
2633
2634         case VIDIOC_ENUM_FMT:
2635                 return sn9c102_vidioc_enum_fmt(cam, arg);
2636
2637         case VIDIOC_G_FMT:
2638                 return sn9c102_vidioc_g_fmt(cam, arg);
2639
2640         case VIDIOC_TRY_FMT:
2641         case VIDIOC_S_FMT:
2642                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
2643
2644         case VIDIOC_G_JPEGCOMP:
2645                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
2646
2647         case VIDIOC_S_JPEGCOMP:
2648                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
2649
2650         case VIDIOC_REQBUFS:
2651                 return sn9c102_vidioc_reqbufs(cam, arg);
2652
2653         case VIDIOC_QUERYBUF:
2654                 return sn9c102_vidioc_querybuf(cam, arg);
2655
2656         case VIDIOC_QBUF:
2657                 return sn9c102_vidioc_qbuf(cam, arg);
2658
2659         case VIDIOC_DQBUF:
2660                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
2661
2662         case VIDIOC_STREAMON:
2663                 return sn9c102_vidioc_streamon(cam, arg);
2664
2665         case VIDIOC_STREAMOFF:
2666                 return sn9c102_vidioc_streamoff(cam, arg);
2667
2668         case VIDIOC_G_PARM:
2669                 return sn9c102_vidioc_g_parm(cam, arg);
2670
2671         case VIDIOC_S_PARM_OLD:
2672         case VIDIOC_S_PARM:
2673                 return sn9c102_vidioc_s_parm(cam, arg);
2674
2675         case VIDIOC_G_STD:
2676         case VIDIOC_S_STD:
2677         case VIDIOC_QUERYSTD:
2678         case VIDIOC_ENUMSTD:
2679         case VIDIOC_QUERYMENU:
2680                 return -EINVAL;
2681
2682         default:
2683                 return -EINVAL;
2684
2685         }
2686 }
2687
2688
2689 static int sn9c102_ioctl(struct inode* inode, struct file* filp,
2690                          unsigned int cmd, unsigned long arg)
2691 {
2692         struct sn9c102_device* cam = video_get_drvdata(video_devdata(filp));
2693         int err = 0;
2694
2695         if (down_interruptible(&cam->fileop_sem))
2696                 return -ERESTARTSYS;
2697
2698         if (cam->state & DEV_DISCONNECTED) {
2699                 DBG(1, "Device not present");
2700                 up(&cam->fileop_sem);
2701                 return -ENODEV;
2702         }
2703
2704         if (cam->state & DEV_MISCONFIGURED) {
2705                 DBG(1, "The camera is misconfigured. Close and open it "
2706                        "again.");
2707                 up(&cam->fileop_sem);
2708                 return -EIO;
2709         }
2710
2711         err = sn9c102_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2712
2713         up(&cam->fileop_sem);
2714
2715         return err;
2716 }
2717
2718 /*****************************************************************************/
2719
2720 static struct file_operations sn9c102_fops = {
2721         .owner = THIS_MODULE,
2722         .open =    sn9c102_open,
2723         .release = sn9c102_release,
2724         .ioctl =   sn9c102_ioctl,
2725         .read =    sn9c102_read,
2726         .poll =    sn9c102_poll,
2727         .mmap =    sn9c102_mmap,
2728         .llseek =  no_llseek,
2729 };
2730
2731 /*****************************************************************************/
2732
2733 /* It exists a single interface only. We do not need to validate anything. */
2734 static int
2735 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2736 {
2737         struct usb_device *udev = interface_to_usbdev(intf);
2738         struct sn9c102_device* cam;
2739         static unsigned int dev_nr = 0;
2740         unsigned int i;
2741         int err = 0, r;
2742
2743         if (!(cam = kmalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
2744                 return -ENOMEM;
2745
2746         cam->usbdev = udev;
2747         memcpy(&cam->dev, &udev->dev, sizeof(struct device));
2748
2749         if (!(cam->control_buffer = kmalloc(8, GFP_KERNEL))) {
2750                 DBG(1, "kmalloc() failed");
2751                 err = -ENOMEM;
2752                 goto fail;
2753         }
2754
2755         if (!(cam->v4ldev = video_device_alloc())) {
2756                 DBG(1, "video_device_alloc() failed");
2757                 err = -ENOMEM;
2758                 goto fail;
2759         }
2760
2761         init_MUTEX(&cam->dev_sem);
2762
2763         r = sn9c102_read_reg(cam, 0x00);
2764         if (r < 0 || r != 0x10) {
2765                 DBG(1, "Sorry, this is not a SN9C10x based camera "
2766                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2767                 err = -ENODEV;
2768                 goto fail;
2769         }
2770
2771         cam->bridge = (id->idProduct & 0xffc0) == 0x6080 ?
2772                       BRIDGE_SN9C103 : BRIDGE_SN9C102;
2773         switch (cam->bridge) {
2774         case BRIDGE_SN9C101:
2775         case BRIDGE_SN9C102:
2776                 DBG(2, "SN9C10[12] PC Camera Controller detected "
2777                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2778                 break;
2779         case BRIDGE_SN9C103:
2780                 DBG(2, "SN9C103 PC Camera Controller detected "
2781                        "(vid/pid 0x%04X/0x%04X)", id->idVendor, id->idProduct);
2782                 break;
2783         }
2784
2785         for  (i = 0; sn9c102_sensor_table[i]; i++) {
2786                 err = sn9c102_sensor_table[i](cam);
2787                 if (!err)
2788                         break;
2789         }
2790
2791         if (!err && cam->sensor) {
2792                 DBG(2, "%s image sensor detected", cam->sensor->name);
2793                 DBG(3, "Support for %s maintained by %s",
2794                     cam->sensor->name, cam->sensor->maintainer);
2795         } else {
2796                 DBG(1, "No supported image sensor detected");
2797                 err = -ENODEV;
2798                 goto fail;
2799         }
2800
2801         if (sn9c102_init(cam)) {
2802                 DBG(1, "Initialization failed. I will retry on open().");
2803                 cam->state |= DEV_MISCONFIGURED;
2804         }
2805
2806         strcpy(cam->v4ldev->name, "SN9C10x PC Camera");
2807         cam->v4ldev->owner = THIS_MODULE;
2808         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2809         cam->v4ldev->hardware = VID_HARDWARE_SN9C102;
2810         cam->v4ldev->fops = &sn9c102_fops;
2811         cam->v4ldev->minor = video_nr[dev_nr];
2812         cam->v4ldev->release = video_device_release;
2813         video_set_drvdata(cam->v4ldev, cam);
2814
2815         down(&cam->dev_sem);
2816
2817         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2818                                     video_nr[dev_nr]);
2819         if (err) {
2820                 DBG(1, "V4L2 device registration failed");
2821                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2822                         DBG(1, "Free /dev/videoX node not found");
2823                 video_nr[dev_nr] = -1;
2824                 dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2825                 up(&cam->dev_sem);
2826                 goto fail;
2827         }
2828
2829         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2830
2831         cam->module_param.force_munmap = force_munmap[dev_nr];
2832
2833         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
2834
2835         sn9c102_create_sysfs(cam);
2836         DBG(2, "Optional device control through 'sysfs' interface ready");
2837
2838         usb_set_intfdata(intf, cam);
2839
2840         up(&cam->dev_sem);
2841
2842         return 0;
2843
2844 fail:
2845         if (cam) {
2846                 kfree(cam->control_buffer);
2847                 if (cam->v4ldev)
2848                         video_device_release(cam->v4ldev);
2849                 kfree(cam);
2850         }
2851         return err;
2852 }
2853
2854
2855 static void sn9c102_usb_disconnect(struct usb_interface* intf)
2856 {
2857         struct sn9c102_device* cam = usb_get_intfdata(intf);
2858
2859         if (!cam)
2860                 return;
2861
2862         down_write(&sn9c102_disconnect);
2863
2864         down(&cam->dev_sem);
2865
2866         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2867
2868         wake_up_interruptible_all(&cam->open);
2869
2870         if (cam->users) {
2871                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2872                        "memory deallocation are deferred on close.",
2873                     cam->v4ldev->minor);
2874                 cam->state |= DEV_MISCONFIGURED;
2875                 sn9c102_stop_transfer(cam);
2876                 cam->state |= DEV_DISCONNECTED;
2877                 wake_up_interruptible(&cam->wait_frame);
2878                 wake_up_interruptible(&cam->wait_stream);
2879         } else {
2880                 cam->state |= DEV_DISCONNECTED;
2881                 sn9c102_release_resources(cam);
2882         }
2883
2884         up(&cam->dev_sem);
2885
2886         if (!cam->users)
2887                 kfree(cam);
2888
2889         up_write(&sn9c102_disconnect);
2890 }
2891
2892
2893 static struct usb_driver sn9c102_usb_driver = {
2894         .name =       "sn9c102",
2895         .id_table =   sn9c102_id_table,
2896         .probe =      sn9c102_usb_probe,
2897         .disconnect = sn9c102_usb_disconnect,
2898 };
2899
2900 /*****************************************************************************/
2901
2902 static int __init sn9c102_module_init(void)
2903 {
2904         int err = 0;
2905
2906         KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
2907         KDBG(3, SN9C102_MODULE_AUTHOR);
2908
2909         if ((err = usb_register(&sn9c102_usb_driver)))
2910                 KDBG(1, "usb_register() failed");
2911
2912         return err;
2913 }
2914
2915
2916 static void __exit sn9c102_module_exit(void)
2917 {
2918         usb_deregister(&sn9c102_usb_driver);
2919 }
2920
2921
2922 module_init(sn9c102_module_init);
2923 module_exit(sn9c102_module_exit);