drivers/media/video/sn9c102/sn9c102_core.c

   1 /***************************************************************************
   2  * V4L2 driver for SN9C1xx PC Camera Controllers                           *
   3  *                                                                         *
   4  * Copyright (C) 2004-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
   5  *                                                                         *
   6  * This program is free software; you can redistribute it and/or modify    *
   7  * it under the terms of the GNU General Public License as published by    *
   8  * the Free Software Foundation; either version 2 of the License, or       *
   9  * (at your option) any later version.                                     *
  10  *                                                                         *
  11  * This program is distributed in the hope that it will be useful,         *
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  14  * GNU General Public License for more details.                            *
  15  *                                                                         *
  16  * You should have received a copy of the GNU General Public License       *
  17  * along with this program; if not, write to the Free Software             *
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  19  ***************************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/param.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/device.h>
  28 #include <linux/fs.h>
  29 #include <linux/delay.h>
  30 #include <linux/compiler.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/poll.h>
  33 #include <linux/stat.h>
  34 #include <linux/mm.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/page-flags.h>
  37 #include <asm/byteorder.h>
  38 #include <asm/page.h>
  39 #include <asm/uaccess.h>
  40
  41 #include "sn9c102.h"
  42
  43 /*****************************************************************************/
  44
  45 #define SN9C102_MODULE_NAME     "V4L2 driver for SN9C1xx PC Camera Controllers"
  46 #define SN9C102_MODULE_ALIAS    "sn9c1xx"
  47 #define SN9C102_MODULE_AUTHOR   "(C) 2004-2007 Luca Risolia"
  48 #define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
  49 #define SN9C102_MODULE_LICENSE  "GPL"
  50 #define SN9C102_MODULE_VERSION  "1:1.47pre49"
  51 #define SN9C102_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 47)
  52
  53 /*****************************************************************************/
  54
  55 MODULE_DEVICE_TABLE(usb, sn9c102_id_table);
  56
  57 MODULE_AUTHOR(SN9C102_MODULE_AUTHOR " " SN9C102_AUTHOR_EMAIL);
  58 MODULE_DESCRIPTION(SN9C102_MODULE_NAME);
  59 MODULE_ALIAS(SN9C102_MODULE_ALIAS);
  60 MODULE_VERSION(SN9C102_MODULE_VERSION);
  61 MODULE_LICENSE(SN9C102_MODULE_LICENSE);
  62
  63 static short video_nr[] = {[0 ... SN9C102_MAX_DEVICES-1] = -1};
  64 module_param_array(video_nr, short, NULL, 0444);
  65 MODULE_PARM_DESC(video_nr,
  66                  " <-1|n[,...]>"
  67                  "\nSpecify V4L2 minor mode number."
  68                  "\n-1 = use next available (default)"
  69                  "\n n = use minor number n (integer >= 0)"
  70                  "\nYou can specify up to "__MODULE_STRING(SN9C102_MAX_DEVICES)
  71                  " cameras this way."
  72                  "\nFor example:"
  73                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  74                  "\nthe second camera and use auto for the first"
  75                  "\none and for every other camera."
  76                  "\n");
  77
  78 static short force_munmap[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  79                                SN9C102_FORCE_MUNMAP};
  80 module_param_array(force_munmap, bool, NULL, 0444);
  81 MODULE_PARM_DESC(force_munmap,
  82                  " <0|1[,...]>"
  83                  "\nForce the application to unmap previously"
  84                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  85                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  86                  "\nthis feature. This parameter is specific for each"
  87                  "\ndetected camera."
  88                  "\n0 = do not force memory unmapping"
  89                  "\n1 = force memory unmapping (save memory)"
  90                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
  91                  "\n");
  92
  93 static unsigned int frame_timeout[] = {[0 ... SN9C102_MAX_DEVICES-1] =
  94                                        SN9C102_FRAME_TIMEOUT};
  95 module_param_array(frame_timeout, uint, NULL, 0644);
  96 MODULE_PARM_DESC(frame_timeout,
  97                  " <0|n[,...]>"
  98                  "\nTimeout for a video frame in seconds before"
  99                  "\nreturning an I/O error; 0 for infinity."
 100                  "\nThis parameter is specific for each detected camera."
 101                  "\nDefault value is "__MODULE_STRING(SN9C102_FRAME_TIMEOUT)"."
 102                  "\n");
 103
 104 #ifdef SN9C102_DEBUG
 105 static unsigned short debug = SN9C102_DEBUG_LEVEL;
 106 module_param(debug, ushort, 0644);
 107 MODULE_PARM_DESC(debug,
 108                  " <n>"
 109                  "\nDebugging information level, from 0 to 3:"
 110                  "\n0 = none (use carefully)"
 111                  "\n1 = critical errors"
 112                  "\n2 = significant informations"
 113                  "\n3 = more verbose messages"
 114                  "\nLevel 3 is useful for testing only."
 115                  "\nDefault value is "__MODULE_STRING(SN9C102_DEBUG_LEVEL)"."
 116                  "\n");
 117 #endif
 118
 119 /*
 120    Add the probe entries to this table. Be sure to add the entry in the right
 121    place, since, on failure, the next probing routine is called according to
 122    the order of the list below, from top to bottom.
 123 */
 124 static int (*sn9c102_sensor_table[])(struct sn9c102_device *) = {
 125         &sn9c102_probe_hv7131d, /* strong detection based on SENSOR ids */
 126         &sn9c102_probe_hv7131r, /* strong detection based on SENSOR ids */
 127         &sn9c102_probe_mi0343, /* strong detection based on SENSOR ids */
 128         &sn9c102_probe_mi0360, /* strong detection based on SENSOR ids */
 129         &sn9c102_probe_mt9v111, /* strong detection based on SENSOR ids */
 130         &sn9c102_probe_pas106b, /* strong detection based on SENSOR ids */
 131         &sn9c102_probe_pas202bcb, /* strong detection based on SENSOR ids */
 132         &sn9c102_probe_ov7630, /* strong detection based on SENSOR ids */
 133         &sn9c102_probe_ov7660, /* strong detection based on SENSOR ids */
 134         &sn9c102_probe_tas5110c1b, /* detection based on USB pid/vid */
 135         &sn9c102_probe_tas5110d, /* detection based on USB pid/vid */
 136         &sn9c102_probe_tas5130d1b, /* detection based on USB pid/vid */
 137 };
 138
 139 /*****************************************************************************/
 140
 141 static u32
 142 sn9c102_request_buffers(struct sn9c102_device* cam, u32 count,
 143                         enum sn9c102_io_method io)
 144 {
 145         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 146         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 147         size_t imagesize = cam->module_param.force_munmap || io == IO_READ ?
 148                            (p->width * p->height * p->priv) / 8 :
 149                            (r->width * r->height * p->priv) / 8;
 150         void* buff = NULL;
 151         u32 i;
 152
 153         if (count > SN9C102_MAX_FRAMES)
 154                 count = SN9C102_MAX_FRAMES;
 155
 156         if (cam->bridge == BRIDGE_SN9C105 || cam->bridge == BRIDGE_SN9C120)
 157                 imagesize += 589 + 2; /* length of JPEG header + EOI marker */
 158
 159         cam->nbuffers = count;
 160         while (cam->nbuffers > 0) {
 161                 if ((buff = vmalloc_32_user(cam->nbuffers *
 162                                             PAGE_ALIGN(imagesize))))
 163                         break;
 164                 cam->nbuffers--;
 165         }
 166
 167         for (i = 0; i < cam->nbuffers; i++) {
 168                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 169                 cam->frame[i].buf.index = i;
 170                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 171                 cam->frame[i].buf.length = imagesize;
 172                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 173                 cam->frame[i].buf.sequence = 0;
 174                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 175                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 176                 cam->frame[i].buf.flags = 0;
 177         }
 178
 179         return cam->nbuffers;
 180 }
 181
 182
 183 static void sn9c102_release_buffers(struct sn9c102_device* cam)
 184 {
 185         if (cam->nbuffers) {
 186                 vfree(cam->frame[0].bufmem);
 187                 cam->nbuffers = 0;
 188         }
 189         cam->frame_current = NULL;
 190 }
 191
 192
 193 static void sn9c102_empty_framequeues(struct sn9c102_device* cam)
 194 {
 195         u32 i;
 196
 197         INIT_LIST_HEAD(&cam->inqueue);
 198         INIT_LIST_HEAD(&cam->outqueue);
 199
 200         for (i = 0; i < SN9C102_MAX_FRAMES; i++) {
 201                 cam->frame[i].state = F_UNUSED;
 202                 cam->frame[i].buf.bytesused = 0;
 203         }
 204 }
 205
 206
 207 static void sn9c102_requeue_outqueue(struct sn9c102_device* cam)
 208 {
 209         struct sn9c102_frame_t *i;
 210
 211         list_for_each_entry(i, &cam->outqueue, frame) {
 212                 i->state = F_QUEUED;
 213                 list_add(&i->frame, &cam->inqueue);
 214         }
 215
 216         INIT_LIST_HEAD(&cam->outqueue);
 217 }
 218
 219
 220 static void sn9c102_queue_unusedframes(struct sn9c102_device* cam)
 221 {
 222         unsigned long lock_flags;
 223         u32 i;
 224
 225         for (i = 0; i < cam->nbuffers; i++)
 226                 if (cam->frame[i].state == F_UNUSED) {
 227                         cam->frame[i].state = F_QUEUED;
 228                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 229                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 230                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 231                 }
 232 }
 233
 234 /*****************************************************************************/
 235
 236 /*
 237    Write a sequence of count value/register pairs. Returns -1 after the first
 238    failed write, or 0 for no errors.
 239 */
 240 int sn9c102_write_regs(struct sn9c102_device* cam, const u8 valreg[][2],
 241                        int count)
 242 {
 243         struct usb_device* udev = cam->usbdev;
 244         u8* buff = cam->control_buffer;
 245         int i, res;
 246
 247         for (i = 0; i < count; i++) {
 248                 u8 index = valreg[i][1];
 249
 250                 /*
 251                    index is a u8, so it must be <256 and can't be out of range.
 252                    If we put in a check anyway, gcc annoys us with a warning
 253                    hat our check is useless. People get all uppity when they
 254                    see warnings in the kernel compile.
 255                 */
 256
 257                 *buff = valreg[i][0];
 258
 259                 res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08,
 260                                       0x41, index, 0, buff, 1,
 261                                       SN9C102_CTRL_TIMEOUT);
 262
 263                 if (res < 0) {
 264                         DBG(3, "Failed to write a register (value 0x%02X, "
 265                                "index 0x%02X, error %d)", *buff, index, res);
 266                         return -1;
 267                 }
 268
 269                 cam->reg[index] = *buff;
 270         }
 271
 272         return 0;
 273 }
 274
 275
 276 int sn9c102_write_reg(struct sn9c102_device* cam, u8 value, u16 index)
 277 {
 278         struct usb_device* udev = cam->usbdev;
 279         u8* buff = cam->control_buffer;
 280         int res;
 281
 282         if (index >= ARRAY_SIZE(cam->reg))
 283                 return -1;
 284
 285         *buff = value;
 286
 287         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 288                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 289         if (res < 0) {
 290                 DBG(3, "Failed to write a register (value 0x%02X, index "
 291                        "0x%02X, error %d)", value, index, res);
 292                 return -1;
 293         }
 294
 295         cam->reg[index] = value;
 296
 297         return 0;
 298 }
 299
 300
 301 /* NOTE: with the SN9C10[123] reading some registers always returns 0 */
 302 int sn9c102_read_reg(struct sn9c102_device* cam, u16 index)
 303 {
 304         struct usb_device* udev = cam->usbdev;
 305         u8* buff = cam->control_buffer;
 306         int res;
 307
 308         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 309                               index, 0, buff, 1, SN9C102_CTRL_TIMEOUT);
 310         if (res < 0)
 311                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 312                     index, res);
 313
 314         return (res >= 0) ? (int)(*buff) : -1;
 315 }
 316
 317
 318 int sn9c102_pread_reg(struct sn9c102_device* cam, u16 index)
 319 {
 320         if (index >= ARRAY_SIZE(cam->reg))
 321                 return -1;
 322
 323         return cam->reg[index];
 324 }
 325
 326
 327 static int
 328 sn9c102_i2c_wait(struct sn9c102_device* cam,
 329                  const struct sn9c102_sensor* sensor)
 330 {
 331         int i, r;
 332
 333         for (i = 1; i <= 5; i++) {
 334                 r = sn9c102_read_reg(cam, 0x08);
 335                 if (r < 0)
 336                         return -EIO;
 337                 if (r & 0x04)
 338                         return 0;
 339                 if (sensor->frequency & SN9C102_I2C_400KHZ)
 340                         udelay(5*16);
 341                 else
 342                         udelay(16*16);
 343         }
 344         return -EBUSY;
 345 }
 346
 347
 348 static int
 349 sn9c102_i2c_detect_read_error(struct sn9c102_device* cam,
 350                               const struct sn9c102_sensor* sensor)
 351 {
 352         int r , err = 0;
 353
 354         r = sn9c102_read_reg(cam, 0x08);
 355         if (r < 0)
 356                 err += r;
 357
 358         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
 359                 if (!(r & 0x08))
 360                         err += -1;
 361         } else {
 362                 if (r & 0x08)
 363                         err += -1;
 364         }
 365
 366         return err ? -EIO : 0;
 367 }
 368
 369
 370 static int
 371 sn9c102_i2c_detect_write_error(struct sn9c102_device* cam,
 372                                const struct sn9c102_sensor* sensor)
 373 {
 374         int r;
 375         r = sn9c102_read_reg(cam, 0x08);
 376         return (r < 0 || (r >= 0 && (r & 0x08))) ? -EIO : 0;
 377 }
 378
 379
 380 int
 381 sn9c102_i2c_try_raw_read(struct sn9c102_device* cam,
 382                          const struct sn9c102_sensor* sensor, u8 data0,
 383                          u8 data1, u8 n, u8 buffer[])
 384 {
 385         struct usb_device* udev = cam->usbdev;
 386         u8* data = cam->control_buffer;
 387         int i = 0, err = 0, res;
 388
 389         /* Write cycle */
 390         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 391                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) | 0x10;
 392         data[1] = data0; /* I2C slave id */
 393         data[2] = data1; /* address */
 394         data[7] = 0x10;
 395         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 396                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 397         if (res < 0)
 398                 err += res;
 399
 400         err += sn9c102_i2c_wait(cam, sensor);
 401
 402         /* Read cycle - n bytes */
 403         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 404                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0) |
 405                   (n << 4) | 0x02;
 406         data[1] = data0;
 407         data[7] = 0x10;
 408         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 409                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 410         if (res < 0)
 411                 err += res;
 412
 413         err += sn9c102_i2c_wait(cam, sensor);
 414
 415         /* The first read byte will be placed in data[4] */
 416         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 417                               0x0a, 0, data, 5, SN9C102_CTRL_TIMEOUT);
 418         if (res < 0)
 419                 err += res;
 420
 421         err += sn9c102_i2c_detect_read_error(cam, sensor);
 422
 423         PDBGG("I2C read: address 0x%02X, first read byte: 0x%02X", data1,
 424               data[4]);
 425
 426         if (err) {
 427                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 428                 return -1;
 429         }
 430
 431         if (buffer)
 432                 for (i = 0; i < n && i < 5; i++)
 433                         buffer[n-i-1] = data[4-i];
 434
 435         return (int)data[4];
 436 }
 437
 438
 439 int
 440 sn9c102_i2c_try_raw_write(struct sn9c102_device* cam,
 441                           const struct sn9c102_sensor* sensor, u8 n, u8 data0,
 442                           u8 data1, u8 data2, u8 data3, u8 data4, u8 data5)
 443 {
 444         struct usb_device* udev = cam->usbdev;
 445         u8* data = cam->control_buffer;
 446         int err = 0, res;
 447
 448         /* Write cycle. It usually is address + value */
 449         data[0] = ((sensor->interface == SN9C102_I2C_2WIRES) ? 0x80 : 0) |
 450                   ((sensor->frequency & SN9C102_I2C_400KHZ) ? 0x01 : 0)
 451                   | ((n - 1) << 4);
 452         data[1] = data0;
 453         data[2] = data1;
 454         data[3] = data2;
 455         data[4] = data3;
 456         data[5] = data4;
 457         data[6] = data5;
 458         data[7] = 0x17;
 459         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x08, 0x41,
 460                               0x08, 0, data, 8, SN9C102_CTRL_TIMEOUT);
 461         if (res < 0)
 462                 err += res;
 463
 464         err += sn9c102_i2c_wait(cam, sensor);
 465         err += sn9c102_i2c_detect_write_error(cam, sensor);
 466
 467         if (err)
 468                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 469
 470         PDBGG("I2C raw write: %u bytes, data0 = 0x%02X, data1 = 0x%02X, "
 471               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X",
 472               n, data0, data1, data2, data3, data4, data5);
 473
 474         return err ? -1 : 0;
 475 }
 476
 477
 478 int
 479 sn9c102_i2c_try_read(struct sn9c102_device* cam,
 480                      const struct sn9c102_sensor* sensor, u8 address)
 481 {
 482         return sn9c102_i2c_try_raw_read(cam, sensor, sensor->i2c_slave_id,
 483                                         address, 1, NULL);
 484 }
 485
 486
 487 static int sn9c102_i2c_try_write(struct sn9c102_device* cam,
 488                                  const struct sn9c102_sensor* sensor,
 489                                  u8 address, u8 value)
 490 {
 491         return sn9c102_i2c_try_raw_write(cam, sensor, 3,
 492                                          sensor->i2c_slave_id, address,
 493                                          value, 0, 0, 0);
 494 }
 495
 496
 497 int sn9c102_i2c_read(struct sn9c102_device* cam, u8 address)
 498 {
 499         return sn9c102_i2c_try_read(cam, &cam->sensor, address);
 500 }
 501
 502
 503 int sn9c102_i2c_write(struct sn9c102_device* cam, u8 address, u8 value)
 504 {
 505         return sn9c102_i2c_try_write(cam, &cam->sensor, address, value);
 506 }
 507
 508 /*****************************************************************************/
 509
 510 static size_t sn9c102_sof_length(struct sn9c102_device* cam)
 511 {
 512         switch (cam->bridge) {
 513         case BRIDGE_SN9C101:
 514         case BRIDGE_SN9C102:
 515                 return 12;
 516         case BRIDGE_SN9C103:
 517                 return 18;
 518         case BRIDGE_SN9C105:
 519         case BRIDGE_SN9C120:
 520                 return 62;
 521         }
 522
 523         return 0;
 524 }
 525
 526
 527 static void*
 528 sn9c102_find_sof_header(struct sn9c102_device* cam, void* mem, size_t len)
 529 {
 530         static const char marker[6] = {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96};
 531         const char *m = mem;
 532         size_t soflen = 0, i, j;
 533
 534         soflen = sn9c102_sof_length(cam);
 535
 536         for (i = 0; i < len; i++) {
 537                 size_t b;
 538
 539                 /* Read the variable part of the header */
 540                 if (unlikely(cam->sof.bytesread >= sizeof(marker))) {
 541                         cam->sof.header[cam->sof.bytesread] = *(m+i);
 542                         if (++cam->sof.bytesread == soflen) {
 543                                 cam->sof.bytesread = 0;
 544                                 return mem + i;
 545                         }
 546                         continue;
 547                 }
 548
 549                 /* Search for the SOF marker (fixed part) in the header */
 550                 for (j = 0, b=cam->sof.bytesread; j+b < sizeof(marker); j++) {
 551                         if (unlikely(i+j == len))
 552                                 return NULL;
 553                         if (*(m+i+j) == marker[cam->sof.bytesread]) {
 554                                 cam->sof.header[cam->sof.bytesread] = *(m+i+j);
 555                                 if (++cam->sof.bytesread == sizeof(marker)) {
 556                                         PDBGG("Bytes to analyze: %zd. SOF "
 557                                               "starts at byte #%zd", len, i);
 558                                         i += j+1;
 559                                         break;
 560                                 }
 561                         } else {
 562                                 cam->sof.bytesread = 0;
 563                                 break;
 564                         }
 565                 }
 566         }
 567
 568         return NULL;
 569 }
 570
 571
 572 static void*
 573 sn9c102_find_eof_header(struct sn9c102_device* cam, void* mem, size_t len)
 574 {
 575         static const u8 eof_header[4][4] = {
 576                 {0x00, 0x00, 0x00, 0x00},
 577                 {0x40, 0x00, 0x00, 0x00},
 578                 {0x80, 0x00, 0x00, 0x00},
 579                 {0xc0, 0x00, 0x00, 0x00},
 580         };
 581         size_t i, j;
 582
 583         /* The EOF header does not exist in compressed data */
 584         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X ||
 585             cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
 586                 return NULL;
 587
 588         /*
 589            The EOF header might cross the packet boundary, but this is not a
 590            problem, since the end of a frame is determined by checking its size
 591            in the first place.
 592         */
 593         for (i = 0; (len >= 4) && (i <= len - 4); i++)
 594                 for (j = 0; j < ARRAY_SIZE(eof_header); j++)
 595                         if (!memcmp(mem + i, eof_header[j], 4))
 596                                 return mem + i;
 597
 598         return NULL;
 599 }
 600
 601
 602 static void
 603 sn9c102_write_jpegheader(struct sn9c102_device* cam, struct sn9c102_frame_t* f)
 604 {
 605         static const u8 jpeg_header[589] = {
 606                 0xff, 0xd8, 0xff, 0xdb, 0x00, 0x84, 0x00, 0x06, 0x04, 0x05,
 607                 0x06, 0x05, 0x04, 0x06, 0x06, 0x05, 0x06, 0x07, 0x07, 0x06,
 608                 0x08, 0x0a, 0x10, 0x0a, 0x0a, 0x09, 0x09, 0x0a, 0x14, 0x0e,
 609                 0x0f, 0x0c, 0x10, 0x17, 0x14, 0x18, 0x18, 0x17, 0x14, 0x16,
 610                 0x16, 0x1a, 0x1d, 0x25, 0x1f, 0x1a, 0x1b, 0x23, 0x1c, 0x16,
 611                 0x16, 0x20, 0x2c, 0x20, 0x23, 0x26, 0x27, 0x29, 0x2a, 0x29,
 612                 0x19, 0x1f, 0x2d, 0x30, 0x2d, 0x28, 0x30, 0x25, 0x28, 0x29,
 613                 0x28, 0x01, 0x07, 0x07, 0x07, 0x0a, 0x08, 0x0a, 0x13, 0x0a,
 614                 0x0a, 0x13, 0x28, 0x1a, 0x16, 0x1a, 0x28, 0x28, 0x28, 0x28,
 615                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 616                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 617                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 618                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 619                 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0xff, 0xc4, 0x01, 0xa2,
 620                 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 621                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
 622                 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01,
 623                 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 624                 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
 625                 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x10, 0x00,
 626                 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04,
 627                 0x04, 0x00, 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04,
 628                 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61,
 629                 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23,
 630                 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62,
 631                 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
 632                 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38,
 633                 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
 634                 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64,
 635                 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 636                 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
 637                 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
 638                 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
 639                 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2,
 640                 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3,
 641                 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3,
 642                 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3,
 643                 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02,
 644                 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04,
 645                 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
 646                 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
 647                 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1,
 648                 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1,
 649                 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19,
 650                 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
 651                 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
 652                 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64,
 653                 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 654                 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
 655                 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
 656                 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9,
 657                 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
 658                 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
 659                 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3,
 660                 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4,
 661                 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xc0, 0x00, 0x11,
 662                 0x08, 0x01, 0xe0, 0x02, 0x80, 0x03, 0x01, 0x21, 0x00, 0x02,
 663                 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xda, 0x00, 0x0c, 0x03,
 664                 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
 665         };
 666         u8 *pos = f->bufmem;
 667
 668         memcpy(pos, jpeg_header, sizeof(jpeg_header));
 669         *(pos + 6) = 0x00;
 670         *(pos + 7 + 64) = 0x01;
 671         if (cam->compression.quality == 0) {
 672                 memcpy(pos + 7, SN9C102_Y_QTABLE0, 64);
 673                 memcpy(pos + 8 + 64, SN9C102_UV_QTABLE0, 64);
 674         } else if (cam->compression.quality == 1) {
 675                 memcpy(pos + 7, SN9C102_Y_QTABLE1, 64);
 676                 memcpy(pos + 8 + 64, SN9C102_UV_QTABLE1, 64);
 677         }
 678         *(pos + 564) = cam->sensor.pix_format.width & 0xFF;
 679         *(pos + 563) = (cam->sensor.pix_format.width >> 8) & 0xFF;
 680         *(pos + 562) = cam->sensor.pix_format.height & 0xFF;
 681         *(pos + 561) = (cam->sensor.pix_format.height >> 8) & 0xFF;
 682         *(pos + 567) = 0x21;
 683
 684         f->buf.bytesused += sizeof(jpeg_header);
 685 }
 686
 687
 688 static void sn9c102_urb_complete(struct urb *urb)
 689 {
 690         struct sn9c102_device* cam = urb->context;
 691         struct sn9c102_frame_t** f;
 692         size_t imagesize, soflen;
 693         u8 i;
 694         int err = 0;
 695
 696         if (urb->status == -ENOENT)
 697                 return;
 698
 699         f = &cam->frame_current;
 700
 701         if (cam->stream == STREAM_INTERRUPT) {
 702                 cam->stream = STREAM_OFF;
 703                 if ((*f))
 704                         (*f)->state = F_QUEUED;
 705                 cam->sof.bytesread = 0;
 706                 DBG(3, "Stream interrupted by application");
 707                 wake_up(&cam->wait_stream);
 708         }
 709
 710         if (cam->state & DEV_DISCONNECTED)
 711                 return;
 712
 713         if (cam->state & DEV_MISCONFIGURED) {
 714                 wake_up_interruptible(&cam->wait_frame);
 715                 return;
 716         }
 717
 718         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 719                 goto resubmit_urb;
 720
 721         if (!(*f))
 722                 (*f) = list_entry(cam->inqueue.next, struct sn9c102_frame_t,
 723                                   frame);
 724
 725         imagesize = (cam->sensor.pix_format.width *
 726                      cam->sensor.pix_format.height *
 727                      cam->sensor.pix_format.priv) / 8;
 728         if (cam->sensor.pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
 729                 imagesize += 589; /* length of jpeg header */
 730         soflen = sn9c102_sof_length(cam);
 731
 732         for (i = 0; i < urb->number_of_packets; i++) {
 733                 unsigned int img, len, status;
 734                 void *pos, *sof, *eof;
 735
 736                 len = urb->iso_frame_desc[i].actual_length;
 737                 status = urb->iso_frame_desc[i].status;
 738                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 739
 740                 if (status) {
 741                         DBG(3, "Error in isochronous frame");
 742                         (*f)->state = F_ERROR;
 743                         cam->sof.bytesread = 0;
 744                         continue;
 745                 }
 746
 747                 PDBGG("Isochrnous frame: length %u, #%u i", len, i);
 748
 749 redo:
 750                 sof = sn9c102_find_sof_header(cam, pos, len);
 751                 if (likely(!sof)) {
 752                         eof = sn9c102_find_eof_header(cam, pos, len);
 753                         if ((*f)->state == F_GRABBING) {
 754 end_of_frame:
 755                                 img = len;
 756
 757                                 if (eof)
 758                                         img = (eof > pos) ? eof - pos - 1 : 0;
 759
 760                                 if ((*f)->buf.bytesused + img > imagesize) {
 761                                         u32 b;
 762                                         b = (*f)->buf.bytesused + img -
 763                                             imagesize;
 764                                         img = imagesize - (*f)->buf.bytesused;
 765                                         PDBGG("Expected EOF not found: video "
 766                                               "frame cut");
 767                                         if (eof)
 768                                                 DBG(3, "Exceeded limit: +%u "
 769                                                        "bytes", (unsigned)(b));
 770                                 }
 771
 772                                 memcpy((*f)->bufmem + (*f)->buf.bytesused, pos,
 773                                        img);
 774
 775                                 if ((*f)->buf.bytesused == 0)
 776                                         do_gettimeofday(&(*f)->buf.timestamp);
 777
 778                                 (*f)->buf.bytesused += img;
 779
 780                                 if ((*f)->buf.bytesused == imagesize ||
 781                                     ((cam->sensor.pix_format.pixelformat ==
 782                                       V4L2_PIX_FMT_SN9C10X ||
 783                                       cam->sensor.pix_format.pixelformat ==
 784                                       V4L2_PIX_FMT_JPEG) && eof)) {
 785                                         u32 b;
 786
 787                                         b = (*f)->buf.bytesused;
 788                                         (*f)->state = F_DONE;
 789                                         (*f)->buf.sequence= ++cam->frame_count;
 790
 791                                         spin_lock(&cam->queue_lock);
 792                                         list_move_tail(&(*f)->frame,
 793                                                        &cam->outqueue);
 794                                         if (!list_empty(&cam->inqueue))
 795                                                 (*f) = list_entry(
 796                                                         cam->inqueue.next,
 797                                                         struct sn9c102_frame_t,
 798                                                         frame );
 799                                         else
 800                                                 (*f) = NULL;
 801                                         spin_unlock(&cam->queue_lock);
 802
 803                                         memcpy(cam->sysfs.frame_header,
 804                                                cam->sof.header, soflen);
 805
 806                                         DBG(3, "Video frame captured: %lu "
 807                                                "bytes", (unsigned long)(b));
 808
 809                                         if (!(*f))
 810                                                 goto resubmit_urb;
 811
 812                                 } else if (eof) {
 813                                         (*f)->state = F_ERROR;
 814                                         DBG(3, "Not expected EOF after %lu "
 815                                                "bytes of image data",
 816                                             (unsigned long)
 817                                             ((*f)->buf.bytesused));
 818                                 }
 819
 820                                 if (sof) /* (1) */
 821                                         goto start_of_frame;
 822
 823                         } else if (eof) {
 824                                 DBG(3, "EOF without SOF");
 825                                 continue;
 826
 827                         } else {
 828                                 PDBGG("Ignoring pointless isochronous frame");
 829                                 continue;
 830                         }
 831
 832                 } else if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) {
 833 start_of_frame:
 834                         (*f)->state = F_GRABBING;
 835                         (*f)->buf.bytesused = 0;
 836                         len -= (sof - pos);
 837                         pos = sof;
 838                         if (cam->sensor.pix_format.pixelformat ==
 839                             V4L2_PIX_FMT_JPEG)
 840                                 sn9c102_write_jpegheader(cam, (*f));
 841                         DBG(3, "SOF detected: new video frame");
 842                         if (len)
 843                                 goto redo;
 844
 845                 } else if ((*f)->state == F_GRABBING) {
 846                         eof = sn9c102_find_eof_header(cam, pos, len);
 847                         if (eof && eof < sof)
 848                                 goto end_of_frame; /* (1) */
 849                         else {
 850                                 if (cam->sensor.pix_format.pixelformat ==
 851                                     V4L2_PIX_FMT_SN9C10X ||
 852                                     cam->sensor.pix_format.pixelformat ==
 853                                     V4L2_PIX_FMT_JPEG) {
 854                                         if (sof - pos >= soflen) {
 855                                                 eof = sof - soflen;
 856                                         } else { /* remove header */
 857                                                 eof = pos;
 858                                                 (*f)->buf.bytesused -=
 859                                                         (soflen - (sof - pos));
 860                                         }
 861                                         goto end_of_frame;
 862                                 } else {
 863                                         DBG(3, "SOF before expected EOF after "
 864                                                "%lu bytes of image data",
 865                                             (unsigned long)
 866                                             ((*f)->buf.bytesused));
 867                                         goto start_of_frame;
 868                                 }
 869                         }
 870                 }
 871         }
 872
 873 resubmit_urb:
 874         urb->dev = cam->usbdev;
 875         err = usb_submit_urb(urb, GFP_ATOMIC);
 876         if (err < 0 && err != -EPERM) {
 877                 cam->state |= DEV_MISCONFIGURED;
 878                 DBG(1, "usb_submit_urb() failed");
 879         }
 880
 881         wake_up_interruptible(&cam->wait_frame);
 882 }
 883
 884
 885 static int sn9c102_start_transfer(struct sn9c102_device* cam)
 886 {
 887         struct usb_device *udev = cam->usbdev;
 888         struct urb* urb;
 889         struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 890                                                     usb_ifnum_to_if(udev, 0),
 891                                                     SN9C102_ALTERNATE_SETTING);
 892         const unsigned int psz = le16_to_cpu(altsetting->
 893                                              endpoint[0].desc.wMaxPacketSize);
 894         s8 i, j;
 895         int err = 0;
 896
 897         for (i = 0; i < SN9C102_URBS; i++) {
 898                 cam->transfer_buffer[i] = kzalloc(SN9C102_ISO_PACKETS * psz,
 899                                                   GFP_KERNEL);
 900                 if (!cam->transfer_buffer[i]) {
 901                         err = -ENOMEM;
 902                         DBG(1, "Not enough memory");
 903                         goto free_buffers;
 904                 }
 905         }
 906
 907         for (i = 0; i < SN9C102_URBS; i++) {
 908                 urb = usb_alloc_urb(SN9C102_ISO_PACKETS, GFP_KERNEL);
 909                 cam->urb[i] = urb;
 910                 if (!urb) {
 911                         err = -ENOMEM;
 912                         DBG(1, "usb_alloc_urb() failed");
 913                         goto free_urbs;
 914                 }
 915                 urb->dev = udev;
 916                 urb->context = cam;
 917                 urb->pipe = usb_rcvisocpipe(udev, 1);
 918                 urb->transfer_flags = URB_ISO_ASAP;
 919                 urb->number_of_packets = SN9C102_ISO_PACKETS;
 920                 urb->complete = sn9c102_urb_complete;
 921                 urb->transfer_buffer = cam->transfer_buffer[i];
 922                 urb->transfer_buffer_length = psz * SN9C102_ISO_PACKETS;
 923                 urb->interval = 1;
 924                 for (j = 0; j < SN9C102_ISO_PACKETS; j++) {
 925                         urb->iso_frame_desc[j].offset = psz * j;
 926                         urb->iso_frame_desc[j].length = psz;
 927                 }
 928         }
 929
 930         /* Enable video */
 931         if (!(cam->reg[0x01] & 0x04)) {
 932                 err = sn9c102_write_reg(cam, cam->reg[0x01] | 0x04, 0x01);
 933                 if (err) {
 934                         err = -EIO;
 935                         DBG(1, "I/O hardware error");
 936                         goto free_urbs;
 937                 }
 938         }
 939
 940         err = usb_set_interface(udev, 0, SN9C102_ALTERNATE_SETTING);
 941         if (err) {
 942                 DBG(1, "usb_set_interface() failed");
 943                 goto free_urbs;
 944         }
 945
 946         cam->frame_current = NULL;
 947         cam->sof.bytesread = 0;
 948
 949         for (i = 0; i < SN9C102_URBS; i++) {
 950                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 951                 if (err) {
 952                         for (j = i-1; j >= 0; j--)
 953                                 usb_kill_urb(cam->urb[j]);
 954                         DBG(1, "usb_submit_urb() failed, error %d", err);
 955                         goto free_urbs;
 956                 }
 957         }
 958
 959         return 0;
 960
 961 free_urbs:
 962         for (i = 0; (i < SN9C102_URBS) && cam->urb[i]; i++)
 963                 usb_free_urb(cam->urb[i]);
 964
 965 free_buffers:
 966         for (i = 0; (i < SN9C102_URBS) && cam->transfer_buffer[i]; i++)
 967                 kfree(cam->transfer_buffer[i]);
 968
 969         return err;
 970 }
 971
 972
 973 static int sn9c102_stop_transfer(struct sn9c102_device* cam)
 974 {
 975         struct usb_device *udev = cam->usbdev;
 976         s8 i;
 977         int err = 0;
 978
 979         if (cam->state & DEV_DISCONNECTED)
 980                 return 0;
 981
 982         for (i = SN9C102_URBS-1; i >= 0; i--) {
 983                 usb_kill_urb(cam->urb[i]);
 984                 usb_free_urb(cam->urb[i]);
 985                 kfree(cam->transfer_buffer[i]);
 986         }
 987
 988         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 989         if (err)
 990                 DBG(3, "usb_set_interface() failed");
 991
 992         return err;
 993 }
 994
 995
 996 static int sn9c102_stream_interrupt(struct sn9c102_device* cam)
 997 {
 998         long timeout;
 999
1000         cam->stream = STREAM_INTERRUPT;
1001         timeout = wait_event_timeout(cam->wait_stream,
1002                                      (cam->stream == STREAM_OFF) ||
1003                                      (cam->state & DEV_DISCONNECTED),
1004                                      SN9C102_URB_TIMEOUT);
1005         if (cam->state & DEV_DISCONNECTED)
1006                 return -ENODEV;
1007         else if (cam->stream != STREAM_OFF) {
1008                 cam->state |= DEV_MISCONFIGURED;
1009                 DBG(1, "URB timeout reached. The camera is misconfigured. "
1010                        "To use it, close and open %s again.",
1011                     video_device_node_name(cam->v4ldev));
1012                 return -EIO;
1013         }
1014
1015         return 0;
1016 }
1017
1018 /*****************************************************************************/
1019
1020 #ifdef CONFIG_VIDEO_ADV_DEBUG
1021 static u16 sn9c102_strtou16(const char* buff, size_t len, ssize_t* count)
1022 {
1023         char str[7];
1024         char* endp;
1025         unsigned long val;
1026
1027         if (len < 6) {
1028                 strncpy(str, buff, len);
1029                 str[len] = '\0';
1030         } else {
1031                 strncpy(str, buff, 6);
1032                 str[6] = '\0';
1033         }
1034
1035         val = simple_strtoul(str, &endp, 0);
1036
1037         *count = 0;
1038         if (val <= 0xffff)
1039                 *count = (ssize_t)(endp - str);
1040         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
1041                 *count += 1;
1042
1043         return (u16)val;
1044 }
1045
1046 /*
1047    NOTE 1: being inside one of the following methods implies that the v4l
1048            device exists for sure (see kobjects and reference counters)
1049    NOTE 2: buffers are PAGE_SIZE long
1050 */
1051
1052 static ssize_t sn9c102_show_reg(struct device* cd,
1053                                 struct device_attribute *attr, char* buf)
1054 {
1055         struct sn9c102_device* cam;
1056         ssize_t count;
1057
1058         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1059                 return -ERESTARTSYS;
1060
1061         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1062         if (!cam) {
1063                 mutex_unlock(&sn9c102_sysfs_lock);
1064                 return -ENODEV;
1065         }
1066
1067         count = sprintf(buf, "%u\n", cam->sysfs.reg);
1068
1069         mutex_unlock(&sn9c102_sysfs_lock);
1070
1071         return count;
1072 }
1073
1074
1075 static ssize_t
1076 sn9c102_store_reg(struct device* cd, struct device_attribute *attr,
1077                   const char* buf, size_t len)
1078 {
1079         struct sn9c102_device* cam;
1080         u16 index;
1081         ssize_t count;
1082
1083         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1084                 return -ERESTARTSYS;
1085
1086         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1087         if (!cam) {
1088                 mutex_unlock(&sn9c102_sysfs_lock);
1089                 return -ENODEV;
1090         }
1091
1092         index = sn9c102_strtou16(buf, len, &count);
1093         if (index >= ARRAY_SIZE(cam->reg) || !count) {
1094                 mutex_unlock(&sn9c102_sysfs_lock);
1095                 return -EINVAL;
1096         }
1097
1098         cam->sysfs.reg = index;
1099
1100         DBG(2, "Moved SN9C1XX register index to 0x%02X", cam->sysfs.reg);
1101         DBG(3, "Written bytes: %zd", count);
1102
1103         mutex_unlock(&sn9c102_sysfs_lock);
1104
1105         return count;
1106 }
1107
1108
1109 static ssize_t sn9c102_show_val(struct device* cd,
1110                                 struct device_attribute *attr, char* buf)
1111 {
1112         struct sn9c102_device* cam;
1113         ssize_t count;
1114         int val;
1115
1116         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1117                 return -ERESTARTSYS;
1118
1119         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1120         if (!cam) {
1121                 mutex_unlock(&sn9c102_sysfs_lock);
1122                 return -ENODEV;
1123         }
1124
1125         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
1126                 mutex_unlock(&sn9c102_sysfs_lock);
1127                 return -EIO;
1128         }
1129
1130         count = sprintf(buf, "%d\n", val);
1131
1132         DBG(3, "Read bytes: %zd, value: %d", count, val);
1133
1134         mutex_unlock(&sn9c102_sysfs_lock);
1135
1136         return count;
1137 }
1138
1139
1140 static ssize_t
1141 sn9c102_store_val(struct device* cd, struct device_attribute *attr,
1142                   const char* buf, size_t len)
1143 {
1144         struct sn9c102_device* cam;
1145         u16 value;
1146         ssize_t count;
1147         int err;
1148
1149         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1150                 return -ERESTARTSYS;
1151
1152         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1153         if (!cam) {
1154                 mutex_unlock(&sn9c102_sysfs_lock);
1155                 return -ENODEV;
1156         }
1157
1158         value = sn9c102_strtou16(buf, len, &count);
1159         if (!count) {
1160                 mutex_unlock(&sn9c102_sysfs_lock);
1161                 return -EINVAL;
1162         }
1163
1164         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
1165         if (err) {
1166                 mutex_unlock(&sn9c102_sysfs_lock);
1167                 return -EIO;
1168         }
1169
1170         DBG(2, "Written SN9C1XX reg. 0x%02X, val. 0x%02X",
1171             cam->sysfs.reg, value);
1172         DBG(3, "Written bytes: %zd", count);
1173
1174         mutex_unlock(&sn9c102_sysfs_lock);
1175
1176         return count;
1177 }
1178
1179
1180 static ssize_t sn9c102_show_i2c_reg(struct device* cd,
1181                                     struct device_attribute *attr, char* buf)
1182 {
1183         struct sn9c102_device* cam;
1184         ssize_t count;
1185
1186         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1187                 return -ERESTARTSYS;
1188
1189         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1190         if (!cam) {
1191                 mutex_unlock(&sn9c102_sysfs_lock);
1192                 return -ENODEV;
1193         }
1194
1195         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1196
1197         DBG(3, "Read bytes: %zd", count);
1198
1199         mutex_unlock(&sn9c102_sysfs_lock);
1200
1201         return count;
1202 }
1203
1204
1205 static ssize_t
1206 sn9c102_store_i2c_reg(struct device* cd, struct device_attribute *attr,
1207                       const char* buf, size_t len)
1208 {
1209         struct sn9c102_device* cam;
1210         u16 index;
1211         ssize_t count;
1212
1213         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1214                 return -ERESTARTSYS;
1215
1216         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1217         if (!cam) {
1218                 mutex_unlock(&sn9c102_sysfs_lock);
1219                 return -ENODEV;
1220         }
1221
1222         index = sn9c102_strtou16(buf, len, &count);
1223         if (!count) {
1224                 mutex_unlock(&sn9c102_sysfs_lock);
1225                 return -EINVAL;
1226         }
1227
1228         cam->sysfs.i2c_reg = index;
1229
1230         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1231         DBG(3, "Written bytes: %zd", count);
1232
1233         mutex_unlock(&sn9c102_sysfs_lock);
1234
1235         return count;
1236 }
1237
1238
1239 static ssize_t sn9c102_show_i2c_val(struct device* cd,
1240                                     struct device_attribute *attr, char* buf)
1241 {
1242         struct sn9c102_device* cam;
1243         ssize_t count;
1244         int val;
1245
1246         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1247                 return -ERESTARTSYS;
1248
1249         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1250         if (!cam) {
1251                 mutex_unlock(&sn9c102_sysfs_lock);
1252                 return -ENODEV;
1253         }
1254
1255         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
1256                 mutex_unlock(&sn9c102_sysfs_lock);
1257                 return -ENOSYS;
1258         }
1259
1260         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1261                 mutex_unlock(&sn9c102_sysfs_lock);
1262                 return -EIO;
1263         }
1264
1265         count = sprintf(buf, "%d\n", val);
1266
1267         DBG(3, "Read bytes: %zd, value: %d", count, val);
1268
1269         mutex_unlock(&sn9c102_sysfs_lock);
1270
1271         return count;
1272 }
1273
1274
1275 static ssize_t
1276 sn9c102_store_i2c_val(struct device* cd, struct device_attribute *attr,
1277                       const char* buf, size_t len)
1278 {
1279         struct sn9c102_device* cam;
1280         u16 value;
1281         ssize_t count;
1282         int err;
1283
1284         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1285                 return -ERESTARTSYS;
1286
1287         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1288         if (!cam) {
1289                 mutex_unlock(&sn9c102_sysfs_lock);
1290                 return -ENODEV;
1291         }
1292
1293         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
1294                 mutex_unlock(&sn9c102_sysfs_lock);
1295                 return -ENOSYS;
1296         }
1297
1298         value = sn9c102_strtou16(buf, len, &count);
1299         if (!count) {
1300                 mutex_unlock(&sn9c102_sysfs_lock);
1301                 return -EINVAL;
1302         }
1303
1304         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1305         if (err) {
1306                 mutex_unlock(&sn9c102_sysfs_lock);
1307                 return -EIO;
1308         }
1309
1310         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1311             cam->sysfs.i2c_reg, value);
1312         DBG(3, "Written bytes: %zd", count);
1313
1314         mutex_unlock(&sn9c102_sysfs_lock);
1315
1316         return count;
1317 }
1318
1319
1320 static ssize_t
1321 sn9c102_store_green(struct device* cd, struct device_attribute *attr,
1322                     const char* buf, size_t len)
1323 {
1324         struct sn9c102_device* cam;
1325         enum sn9c102_bridge bridge;
1326         ssize_t res = 0;
1327         u16 value;
1328         ssize_t count;
1329
1330         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1331                 return -ERESTARTSYS;
1332
1333         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1334         if (!cam) {
1335                 mutex_unlock(&sn9c102_sysfs_lock);
1336                 return -ENODEV;
1337         }
1338
1339         bridge = cam->bridge;
1340
1341         mutex_unlock(&sn9c102_sysfs_lock);
1342
1343         value = sn9c102_strtou16(buf, len, &count);
1344         if (!count)
1345                 return -EINVAL;
1346
1347         switch (bridge) {
1348         case BRIDGE_SN9C101:
1349         case BRIDGE_SN9C102:
1350                 if (value > 0x0f)
1351                         return -EINVAL;
1352                 if ((res = sn9c102_store_reg(cd, attr, "0x11", 4)) >= 0)
1353                         res = sn9c102_store_val(cd, attr, buf, len);
1354                 break;
1355         case BRIDGE_SN9C103:
1356         case BRIDGE_SN9C105:
1357         case BRIDGE_SN9C120:
1358                 if (value > 0x7f)
1359                         return -EINVAL;
1360                 if ((res = sn9c102_store_reg(cd, attr, "0x07", 4)) >= 0)
1361                         res = sn9c102_store_val(cd, attr, buf, len);
1362                 break;
1363         }
1364
1365         return res;
1366 }
1367
1368
1369 static ssize_t
1370 sn9c102_store_blue(struct device* cd, struct device_attribute *attr,
1371                    const char* buf, size_t len)
1372 {
1373         ssize_t res = 0;
1374         u16 value;
1375         ssize_t count;
1376
1377         value = sn9c102_strtou16(buf, len, &count);
1378         if (!count || value > 0x7f)
1379                 return -EINVAL;
1380
1381         if ((res = sn9c102_store_reg(cd, attr, "0x06", 4)) >= 0)
1382                 res = sn9c102_store_val(cd, attr, buf, len);
1383
1384         return res;
1385 }
1386
1387
1388 static ssize_t
1389 sn9c102_store_red(struct device* cd, struct device_attribute *attr,
1390                   const char* buf, size_t len)
1391 {
1392         ssize_t res = 0;
1393         u16 value;
1394         ssize_t count;
1395
1396         value = sn9c102_strtou16(buf, len, &count);
1397         if (!count || value > 0x7f)
1398                 return -EINVAL;
1399
1400         if ((res = sn9c102_store_reg(cd, attr, "0x05", 4)) >= 0)
1401                 res = sn9c102_store_val(cd, attr, buf, len);
1402
1403         return res;
1404 }
1405
1406
1407 static ssize_t sn9c102_show_frame_header(struct device* cd,
1408                                          struct device_attribute *attr,
1409                                          char* buf)
1410 {
1411         struct sn9c102_device* cam;
1412         ssize_t count;
1413
1414         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1415         if (!cam)
1416                 return -ENODEV;
1417
1418         count = sizeof(cam->sysfs.frame_header);
1419         memcpy(buf, cam->sysfs.frame_header, count);
1420
1421         DBG(3, "Frame header, read bytes: %zd", count);
1422
1423         return count;
1424 }
1425
1426
1427 static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR, sn9c102_show_reg, sn9c102_store_reg);
1428 static DEVICE_ATTR(val, S_IRUGO | S_IWUSR, sn9c102_show_val, sn9c102_store_val);
1429 static DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1430                    sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1431 static DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1432                    sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1433 static DEVICE_ATTR(green, S_IWUGO, NULL, sn9c102_store_green);
1434 static DEVICE_ATTR(blue, S_IWUGO, NULL, sn9c102_store_blue);
1435 static DEVICE_ATTR(red, S_IWUGO, NULL, sn9c102_store_red);
1436 static DEVICE_ATTR(frame_header, S_IRUGO, sn9c102_show_frame_header, NULL);
1437
1438
1439 static int sn9c102_create_sysfs(struct sn9c102_device* cam)
1440 {
1441         struct device *dev = &(cam->v4ldev->dev);
1442         int err = 0;
1443
1444         if ((err = device_create_file(dev, &dev_attr_reg)))
1445                 goto err_out;
1446         if ((err = device_create_file(dev, &dev_attr_val)))
1447                 goto err_reg;
1448         if ((err = device_create_file(dev, &dev_attr_frame_header)))
1449                 goto err_val;
1450
1451         if (cam->sensor.sysfs_ops) {
1452                 if ((err = device_create_file(dev, &dev_attr_i2c_reg)))
1453                         goto err_frame_header;
1454                 if ((err = device_create_file(dev, &dev_attr_i2c_val)))
1455                         goto err_i2c_reg;
1456         }
1457
1458         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
1459                 if ((err = device_create_file(dev, &dev_attr_green)))
1460                         goto err_i2c_val;
1461         } else {
1462                 if ((err = device_create_file(dev, &dev_attr_blue)))
1463                         goto err_i2c_val;
1464                 if ((err = device_create_file(dev, &dev_attr_red)))
1465                         goto err_blue;
1466         }
1467
1468         return 0;
1469
1470 err_blue:
1471         device_remove_file(dev, &dev_attr_blue);
1472 err_i2c_val:
1473         if (cam->sensor.sysfs_ops)
1474                 device_remove_file(dev, &dev_attr_i2c_val);
1475 err_i2c_reg:
1476         if (cam->sensor.sysfs_ops)
1477                 device_remove_file(dev, &dev_attr_i2c_reg);
1478 err_frame_header:
1479         device_remove_file(dev, &dev_attr_frame_header);
1480 err_val:
1481         device_remove_file(dev, &dev_attr_val);
1482 err_reg:
1483         device_remove_file(dev, &dev_attr_reg);
1484 err_out:
1485         return err;
1486 }
1487 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1488
1489 /*****************************************************************************/
1490
1491 static int
1492 sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
1493 {
1494         int err = 0;
1495
1496         if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
1497             pix->pixelformat == V4L2_PIX_FMT_JPEG) {
1498                 switch (cam->bridge) {
1499                 case BRIDGE_SN9C101:
1500                 case BRIDGE_SN9C102:
1501                 case BRIDGE_SN9C103:
1502                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1503                                                  0x18);
1504                         break;
1505                 case BRIDGE_SN9C105:
1506                 case BRIDGE_SN9C120:
1507                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1508                                                  0x18);
1509                         break;
1510                 }
1511         } else {
1512                 switch (cam->bridge) {
1513                 case BRIDGE_SN9C101:
1514                 case BRIDGE_SN9C102:
1515                 case BRIDGE_SN9C103:
1516                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1517                                                  0x18);
1518                         break;
1519                 case BRIDGE_SN9C105:
1520                 case BRIDGE_SN9C120:
1521                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1522                                                  0x18);
1523                         break;
1524                 }
1525         }
1526
1527         return err ? -EIO : 0;
1528 }
1529
1530
1531 static int
1532 sn9c102_set_compression(struct sn9c102_device* cam,
1533                         struct v4l2_jpegcompression* compression)
1534 {
1535         int i, err = 0;
1536
1537         switch (cam->bridge) {
1538         case BRIDGE_SN9C101:
1539         case BRIDGE_SN9C102:
1540         case BRIDGE_SN9C103:
1541                 if (compression->quality == 0)
1542                         err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01,
1543                                                  0x17);
1544                 else if (compression->quality == 1)
1545                         err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe,
1546                                                  0x17);
1547                 break;
1548         case BRIDGE_SN9C105:
1549         case BRIDGE_SN9C120:
1550                 if (compression->quality == 0) {
1551                         for (i = 0; i <= 63; i++) {
1552                                 err += sn9c102_write_reg(cam,
1553                                                          SN9C102_Y_QTABLE1[i],
1554                                                          0x100 + i);
1555                                 err += sn9c102_write_reg(cam,
1556                                                          SN9C102_UV_QTABLE1[i],
1557                                                          0x140 + i);
1558                         }
1559                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0xbf,
1560                                                  0x18);
1561                 } else if (compression->quality == 1) {
1562                         for (i = 0; i <= 63; i++) {
1563                                 err += sn9c102_write_reg(cam,
1564                                                          SN9C102_Y_QTABLE1[i],
1565                                                          0x100 + i);
1566                                 err += sn9c102_write_reg(cam,
1567                                                          SN9C102_UV_QTABLE1[i],
1568                                                          0x140 + i);
1569                         }
1570                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x40,
1571                                                  0x18);
1572                 }
1573                 break;
1574         }
1575
1576         return err ? -EIO : 0;
1577 }
1578
1579
1580 static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
1581 {
1582         u8 r = 0;
1583         int err = 0;
1584
1585         if (scale == 1)
1586                 r = cam->reg[0x18] & 0xcf;
1587         else if (scale == 2) {
1588                 r = cam->reg[0x18] & 0xcf;
1589                 r |= 0x10;
1590         } else if (scale == 4)
1591                 r = cam->reg[0x18] | 0x20;
1592
1593         err += sn9c102_write_reg(cam, r, 0x18);
1594         if (err)
1595                 return -EIO;
1596
1597         PDBGG("Scaling factor: %u", scale);
1598
1599         return 0;
1600 }
1601
1602
1603 static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
1604 {
1605         struct sn9c102_sensor* s = &cam->sensor;
1606         u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
1607            v_start = (u8)(rect->top - s->cropcap.bounds.top),
1608            h_size = (u8)(rect->width / 16),
1609            v_size = (u8)(rect->height / 16);
1610         int err = 0;
1611
1612         err += sn9c102_write_reg(cam, h_start, 0x12);
1613         err += sn9c102_write_reg(cam, v_start, 0x13);
1614         err += sn9c102_write_reg(cam, h_size, 0x15);
1615         err += sn9c102_write_reg(cam, v_size, 0x16);
1616         if (err)
1617                 return -EIO;
1618
1619         PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
1620               "%u %u %u %u", h_start, v_start, h_size, v_size);
1621
1622         return 0;
1623 }
1624
1625
1626 static int sn9c102_init(struct sn9c102_device* cam)
1627 {
1628         struct sn9c102_sensor* s = &cam->sensor;
1629         struct v4l2_control ctrl;
1630         struct v4l2_queryctrl *qctrl;
1631         struct v4l2_rect* rect;
1632         u8 i = 0;
1633         int err = 0;
1634
1635         if (!(cam->state & DEV_INITIALIZED)) {
1636                 mutex_init(&cam->open_mutex);
1637                 init_waitqueue_head(&cam->wait_open);
1638                 qctrl = s->qctrl;
1639                 rect = &(s->cropcap.defrect);
1640         } else { /* use current values */
1641                 qctrl = s->_qctrl;
1642                 rect = &(s->_rect);
1643         }
1644
1645         err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
1646         err += sn9c102_set_crop(cam, rect);
1647         if (err)
1648                 return err;
1649
1650         if (s->init) {
1651                 err = s->init(cam);
1652                 if (err) {
1653                         DBG(3, "Sensor initialization failed");
1654                         return err;
1655                 }
1656         }
1657
1658         if (!(cam->state & DEV_INITIALIZED))
1659                 if (cam->bridge == BRIDGE_SN9C101 ||
1660                     cam->bridge == BRIDGE_SN9C102 ||
1661                     cam->bridge == BRIDGE_SN9C103) {
1662                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1663                                 s->pix_format.pixelformat= V4L2_PIX_FMT_SBGGR8;
1664                         cam->compression.quality =  cam->reg[0x17] & 0x01 ?
1665                                                     0 : 1;
1666                 } else {
1667                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
1668                                 s->pix_format.pixelformat = V4L2_PIX_FMT_JPEG;
1669                         cam->compression.quality =  cam->reg[0x18] & 0x40 ?
1670                                                     0 : 1;
1671                         err += sn9c102_set_compression(cam, &cam->compression);
1672                 }
1673         else
1674                 err += sn9c102_set_compression(cam, &cam->compression);
1675         err += sn9c102_set_pix_format(cam, &s->pix_format);
1676         if (s->set_pix_format)
1677                 err += s->set_pix_format(cam, &s->pix_format);
1678         if (err)
1679                 return err;
1680
1681         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X ||
1682             s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1683                 DBG(3, "Compressed video format is active, quality %d",
1684                     cam->compression.quality);
1685         else
1686                 DBG(3, "Uncompressed video format is active");
1687
1688         if (s->set_crop)
1689                 if ((err = s->set_crop(cam, rect))) {
1690                         DBG(3, "set_crop() failed");
1691                         return err;
1692                 }
1693
1694         if (s->set_ctrl) {
1695                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1696                         if (s->qctrl[i].id != 0 &&
1697                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1698                                 ctrl.id = s->qctrl[i].id;
1699                                 ctrl.value = qctrl[i].default_value;
1700                                 err = s->set_ctrl(cam, &ctrl);
1701                                 if (err) {
1702                                         DBG(3, "Set %s control failed",
1703                                             s->qctrl[i].name);
1704                                         return err;
1705                                 }
1706                                 DBG(3, "Image sensor supports '%s' control",
1707                                     s->qctrl[i].name);
1708                         }
1709         }
1710
1711         if (!(cam->state & DEV_INITIALIZED)) {
1712                 mutex_init(&cam->fileop_mutex);
1713                 spin_lock_init(&cam->queue_lock);
1714                 init_waitqueue_head(&cam->wait_frame);
1715                 init_waitqueue_head(&cam->wait_stream);
1716                 cam->nreadbuffers = 2;
1717                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1718                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1719                        sizeof(struct v4l2_rect));
1720                 cam->state |= DEV_INITIALIZED;
1721         }
1722
1723         DBG(2, "Initialization succeeded");
1724         return 0;
1725 }
1726
1727 /*****************************************************************************/
1728
1729 static void sn9c102_release_resources(struct kref *kref)
1730 {
1731         struct sn9c102_device *cam;
1732
1733         mutex_lock(&sn9c102_sysfs_lock);
1734
1735         cam = container_of(kref, struct sn9c102_device, kref);
1736
1737         DBG(2, "V4L2 device %s deregistered",
1738             video_device_node_name(cam->v4ldev));
1739         video_set_drvdata(cam->v4ldev, NULL);
1740         video_unregister_device(cam->v4ldev);
1741         usb_put_dev(cam->usbdev);
1742         kfree(cam->control_buffer);
1743         kfree(cam);
1744
1745         mutex_unlock(&sn9c102_sysfs_lock);
1746
1747 }
1748
1749
1750 static int sn9c102_open(struct file *filp)
1751 {
1752         struct sn9c102_device* cam;
1753         int err = 0;
1754
1755         /*
1756            A read_trylock() in open() is the only safe way to prevent race
1757            conditions with disconnect(), one close() and multiple (not
1758            necessarily simultaneous) attempts to open(). For example, it
1759            prevents from waiting for a second access, while the device
1760            structure is being deallocated, after a possible disconnect() and
1761            during a following close() holding the write lock: given that, after
1762            this deallocation, no access will be possible anymore, using the
1763            non-trylock version would have let open() gain the access to the
1764            device structure improperly.
1765            For this reason the lock must also not be per-device.
1766         */
1767         if (!down_read_trylock(&sn9c102_dev_lock))
1768                 return -ERESTARTSYS;
1769
1770         cam = video_drvdata(filp);
1771
1772         if (wait_for_completion_interruptible(&cam->probe)) {
1773                 up_read(&sn9c102_dev_lock);
1774                 return -ERESTARTSYS;
1775         }
1776
1777         kref_get(&cam->kref);
1778
1779         /*
1780             Make sure to isolate all the simultaneous opens.
1781         */
1782         if (mutex_lock_interruptible(&cam->open_mutex)) {
1783                 kref_put(&cam->kref, sn9c102_release_resources);
1784                 up_read(&sn9c102_dev_lock);
1785                 return -ERESTARTSYS;
1786         }
1787
1788         if (cam->state & DEV_DISCONNECTED) {
1789                 DBG(1, "Device not present");
1790                 err = -ENODEV;
1791                 goto out;
1792         }
1793
1794         if (cam->users) {
1795                 DBG(2, "Device %s is already in use",
1796                     video_device_node_name(cam->v4ldev));
1797                 DBG(3, "Simultaneous opens are not supported");
1798                 /*
1799                    open() must follow the open flags and should block
1800                    eventually while the device is in use.
1801                 */
1802                 if ((filp->f_flags & O_NONBLOCK) ||
1803                     (filp->f_flags & O_NDELAY)) {
1804                         err = -EWOULDBLOCK;
1805                         goto out;
1806                 }
1807                 DBG(2, "A blocking open() has been requested. Wait for the "
1808                        "device to be released...");
1809                 up_read(&sn9c102_dev_lock);
1810                 /*
1811                    We will not release the "open_mutex" lock, so that only one
1812                    process can be in the wait queue below. This way the process
1813                    will be sleeping while holding the lock, without loosing its
1814                    priority after any wake_up().
1815                 */
1816                 err = wait_event_interruptible_exclusive(cam->wait_open,
1817                                                 (cam->state & DEV_DISCONNECTED)
1818                                                          || !cam->users);
1819                 down_read(&sn9c102_dev_lock);
1820                 if (err)
1821                         goto out;
1822                 if (cam->state & DEV_DISCONNECTED) {
1823                         err = -ENODEV;
1824                         goto out;
1825                 }
1826         }
1827
1828         if (cam->state & DEV_MISCONFIGURED) {
1829                 err = sn9c102_init(cam);
1830                 if (err) {
1831                         DBG(1, "Initialization failed again. "
1832                                "I will retry on next open().");
1833                         goto out;
1834                 }
1835                 cam->state &= ~DEV_MISCONFIGURED;
1836         }
1837
1838         if ((err = sn9c102_start_transfer(cam)))
1839                 goto out;
1840
1841         filp->private_data = cam;
1842         cam->users++;
1843         cam->io = IO_NONE;
1844         cam->stream = STREAM_OFF;
1845         cam->nbuffers = 0;
1846         cam->frame_count = 0;
1847         sn9c102_empty_framequeues(cam);
1848
1849         DBG(3, "Video device %s is open", video_device_node_name(cam->v4ldev));
1850
1851 out:
1852         mutex_unlock(&cam->open_mutex);
1853         if (err)
1854                 kref_put(&cam->kref, sn9c102_release_resources);
1855
1856         up_read(&sn9c102_dev_lock);
1857         return err;
1858 }
1859
1860
1861 static int sn9c102_release(struct file *filp)
1862 {
1863         struct sn9c102_device* cam;
1864
1865         down_write(&sn9c102_dev_lock);
1866
1867         cam = video_drvdata(filp);
1868
1869         sn9c102_stop_transfer(cam);
1870         sn9c102_release_buffers(cam);
1871         cam->users--;
1872         wake_up_interruptible_nr(&cam->wait_open, 1);
1873
1874         DBG(3, "Video device %s closed", video_device_node_name(cam->v4ldev));
1875
1876         kref_put(&cam->kref, sn9c102_release_resources);
1877
1878         up_write(&sn9c102_dev_lock);
1879
1880         return 0;
1881 }
1882
1883
1884 static ssize_t
1885 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1886 {
1887         struct sn9c102_device *cam = video_drvdata(filp);
1888         struct sn9c102_frame_t* f, * i;
1889         unsigned long lock_flags;
1890         long timeout;
1891         int err = 0;
1892
1893         if (mutex_lock_interruptible(&cam->fileop_mutex))
1894                 return -ERESTARTSYS;
1895
1896         if (cam->state & DEV_DISCONNECTED) {
1897                 DBG(1, "Device not present");
1898                 mutex_unlock(&cam->fileop_mutex);
1899                 return -ENODEV;
1900         }
1901
1902         if (cam->state & DEV_MISCONFIGURED) {
1903                 DBG(1, "The camera is misconfigured. Close and open it "
1904                        "again.");
1905                 mutex_unlock(&cam->fileop_mutex);
1906                 return -EIO;
1907         }
1908
1909         if (cam->io == IO_MMAP) {
1910                 DBG(3, "Close and open the device again to choose "
1911                        "the read method");
1912                 mutex_unlock(&cam->fileop_mutex);
1913                 return -EBUSY;
1914         }
1915
1916         if (cam->io == IO_NONE) {
1917                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1918                         DBG(1, "read() failed, not enough memory");
1919                         mutex_unlock(&cam->fileop_mutex);
1920                         return -ENOMEM;
1921                 }
1922                 cam->io = IO_READ;
1923                 cam->stream = STREAM_ON;
1924         }
1925
1926         if (list_empty(&cam->inqueue)) {
1927                 if (!list_empty(&cam->outqueue))
1928                         sn9c102_empty_framequeues(cam);
1929                 sn9c102_queue_unusedframes(cam);
1930         }
1931
1932         if (!count) {
1933                 mutex_unlock(&cam->fileop_mutex);
1934                 return 0;
1935         }
1936
1937         if (list_empty(&cam->outqueue)) {
1938                 if (filp->f_flags & O_NONBLOCK) {
1939                         mutex_unlock(&cam->fileop_mutex);
1940                         return -EAGAIN;
1941                 }
1942                 if (!cam->module_param.frame_timeout) {
1943                         err = wait_event_interruptible
1944                               ( cam->wait_frame,
1945                                 (!list_empty(&cam->outqueue)) ||
1946                                 (cam->state & DEV_DISCONNECTED) ||
1947                                 (cam->state & DEV_MISCONFIGURED) );
1948                         if (err) {
1949                                 mutex_unlock(&cam->fileop_mutex);
1950                                 return err;
1951                         }
1952                 } else {
1953                         timeout = wait_event_interruptible_timeout
1954                                   ( cam->wait_frame,
1955                                     (!list_empty(&cam->outqueue)) ||
1956                                     (cam->state & DEV_DISCONNECTED) ||
1957                                     (cam->state & DEV_MISCONFIGURED),
1958                                     msecs_to_jiffies(
1959                                         cam->module_param.frame_timeout * 1000
1960                                     )
1961                                   );
1962                         if (timeout < 0) {
1963                                 mutex_unlock(&cam->fileop_mutex);
1964                                 return timeout;
1965                         } else if (timeout == 0 &&
1966                                    !(cam->state & DEV_DISCONNECTED)) {
1967                                 DBG(1, "Video frame timeout elapsed");
1968                                 mutex_unlock(&cam->fileop_mutex);
1969                                 return -EIO;
1970                         }
1971                 }
1972                 if (cam->state & DEV_DISCONNECTED) {
1973                         mutex_unlock(&cam->fileop_mutex);
1974                         return -ENODEV;
1975                 }
1976                 if (cam->state & DEV_MISCONFIGURED) {
1977                         mutex_unlock(&cam->fileop_mutex);
1978                         return -EIO;
1979                 }
1980         }
1981
1982         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1983
1984         if (count > f->buf.bytesused)
1985                 count = f->buf.bytesused;
1986
1987         if (copy_to_user(buf, f->bufmem, count)) {
1988                 err = -EFAULT;
1989                 goto exit;
1990         }
1991         *f_pos += count;
1992
1993 exit:
1994         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1995         list_for_each_entry(i, &cam->outqueue, frame)
1996                 i->state = F_UNUSED;
1997         INIT_LIST_HEAD(&cam->outqueue);
1998         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1999
2000         sn9c102_queue_unusedframes(cam);
2001
2002         PDBGG("Frame #%lu, bytes read: %zu",
2003               (unsigned long)f->buf.index, count);
2004
2005         mutex_unlock(&cam->fileop_mutex);
2006
2007         return count;
2008 }
2009
2010
2011 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
2012 {
2013         struct sn9c102_device *cam = video_drvdata(filp);
2014         struct sn9c102_frame_t* f;
2015         unsigned long lock_flags;
2016         unsigned int mask = 0;
2017
2018         if (mutex_lock_interruptible(&cam->fileop_mutex))
2019                 return POLLERR;
2020
2021         if (cam->state & DEV_DISCONNECTED) {
2022                 DBG(1, "Device not present");
2023                 goto error;
2024         }
2025
2026         if (cam->state & DEV_MISCONFIGURED) {
2027                 DBG(1, "The camera is misconfigured. Close and open it "
2028                        "again.");
2029                 goto error;
2030         }
2031
2032         if (cam->io == IO_NONE) {
2033                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
2034                                              IO_READ)) {
2035                         DBG(1, "poll() failed, not enough memory");
2036                         goto error;
2037                 }
2038                 cam->io = IO_READ;
2039                 cam->stream = STREAM_ON;
2040         }
2041
2042         if (cam->io == IO_READ) {
2043                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
2044                 list_for_each_entry(f, &cam->outqueue, frame)
2045                         f->state = F_UNUSED;
2046                 INIT_LIST_HEAD(&cam->outqueue);
2047                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2048                 sn9c102_queue_unusedframes(cam);
2049         }
2050
2051         poll_wait(filp, &cam->wait_frame, wait);
2052
2053         if (!list_empty(&cam->outqueue))
2054                 mask |= POLLIN | POLLRDNORM;
2055
2056         mutex_unlock(&cam->fileop_mutex);
2057
2058         return mask;
2059
2060 error:
2061         mutex_unlock(&cam->fileop_mutex);
2062         return POLLERR;
2063 }
2064
2065
2066 static void sn9c102_vm_open(struct vm_area_struct* vma)
2067 {
2068         struct sn9c102_frame_t* f = vma->vm_private_data;
2069         f->vma_use_count++;
2070 }
2071
2072
2073 static void sn9c102_vm_close(struct vm_area_struct* vma)
2074 {
2075         /* NOTE: buffers are not freed here */
2076         struct sn9c102_frame_t* f = vma->vm_private_data;
2077         f->vma_use_count--;
2078 }
2079
2080
2081 static const struct vm_operations_struct sn9c102_vm_ops = {
2082         .open = sn9c102_vm_open,
2083         .close = sn9c102_vm_close,
2084 };
2085
2086
2087 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
2088 {
2089         struct sn9c102_device *cam = video_drvdata(filp);
2090         unsigned long size = vma->vm_end - vma->vm_start,
2091                       start = vma->vm_start;
2092         void *pos;
2093         u32 i;
2094
2095         if (mutex_lock_interruptible(&cam->fileop_mutex))
2096                 return -ERESTARTSYS;
2097
2098         if (cam->state & DEV_DISCONNECTED) {
2099                 DBG(1, "Device not present");
2100                 mutex_unlock(&cam->fileop_mutex);
2101                 return -ENODEV;
2102         }
2103
2104         if (cam->state & DEV_MISCONFIGURED) {
2105                 DBG(1, "The camera is misconfigured. Close and open it "
2106                        "again.");
2107                 mutex_unlock(&cam->fileop_mutex);
2108                 return -EIO;
2109         }
2110
2111         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
2112                 mutex_unlock(&cam->fileop_mutex);
2113                 return -EACCES;
2114         }
2115
2116         if (cam->io != IO_MMAP ||
2117             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
2118                 mutex_unlock(&cam->fileop_mutex);
2119                 return -EINVAL;
2120         }
2121
2122         for (i = 0; i < cam->nbuffers; i++) {
2123                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
2124                         break;
2125         }
2126         if (i == cam->nbuffers) {
2127                 mutex_unlock(&cam->fileop_mutex);
2128                 return -EINVAL;
2129         }
2130
2131         vma->vm_flags |= VM_IO;
2132         vma->vm_flags |= VM_RESERVED;
2133
2134         pos = cam->frame[i].bufmem;
2135         while (size > 0) { /* size is page-aligned */
2136                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
2137                         mutex_unlock(&cam->fileop_mutex);
2138                         return -EAGAIN;
2139                 }
2140                 start += PAGE_SIZE;
2141                 pos += PAGE_SIZE;
2142                 size -= PAGE_SIZE;
2143         }
2144
2145         vma->vm_ops = &sn9c102_vm_ops;
2146         vma->vm_private_data = &cam->frame[i];
2147         sn9c102_vm_open(vma);
2148
2149         mutex_unlock(&cam->fileop_mutex);
2150
2151         return 0;
2152 }
2153
2154 /*****************************************************************************/
2155
2156 static int
2157 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
2158 {
2159         struct v4l2_capability cap = {
2160                 .driver = "sn9c102",
2161                 .version = SN9C102_MODULE_VERSION_CODE,
2162                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
2163                                 V4L2_CAP_STREAMING,
2164         };
2165
2166         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
2167         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
2168                 strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
2169                         sizeof(cap.bus_info));
2170
2171         if (copy_to_user(arg, &cap, sizeof(cap)))
2172                 return -EFAULT;
2173
2174         return 0;
2175 }
2176
2177
2178 static int
2179 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
2180 {
2181         struct v4l2_input i;
2182
2183         if (copy_from_user(&i, arg, sizeof(i)))
2184                 return -EFAULT;
2185
2186         if (i.index)
2187                 return -EINVAL;
2188
2189         memset(&i, 0, sizeof(i));
2190         strcpy(i.name, "Camera");
2191         i.type = V4L2_INPUT_TYPE_CAMERA;
2192
2193         if (copy_to_user(arg, &i, sizeof(i)))
2194                 return -EFAULT;
2195
2196         return 0;
2197 }
2198
2199
2200 static int
2201 sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
2202 {
2203         int index = 0;
2204
2205         if (copy_to_user(arg, &index, sizeof(index)))
2206                 return -EFAULT;
2207
2208         return 0;
2209 }
2210
2211
2212 static int
2213 sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
2214 {
2215         int index;
2216
2217         if (copy_from_user(&index, arg, sizeof(index)))
2218                 return -EFAULT;
2219
2220         if (index != 0)
2221                 return -EINVAL;
2222
2223         return 0;
2224 }
2225
2226
2227 static int
2228 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
2229 {
2230         struct sn9c102_sensor* s = &cam->sensor;
2231         struct v4l2_queryctrl qc;
2232         u8 i;
2233
2234         if (copy_from_user(&qc, arg, sizeof(qc)))
2235                 return -EFAULT;
2236
2237         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2238                 if (qc.id && qc.id == s->qctrl[i].id) {
2239                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
2240                         if (copy_to_user(arg, &qc, sizeof(qc)))
2241                                 return -EFAULT;
2242                         return 0;
2243                 }
2244
2245         return -EINVAL;
2246 }
2247
2248
2249 static int
2250 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
2251 {
2252         struct sn9c102_sensor* s = &cam->sensor;
2253         struct v4l2_control ctrl;
2254         int err = 0;
2255         u8 i;
2256
2257         if (!s->get_ctrl && !s->set_ctrl)
2258                 return -EINVAL;
2259
2260         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2261                 return -EFAULT;
2262
2263         if (!s->get_ctrl) {
2264                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2265                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
2266                                 ctrl.value = s->_qctrl[i].default_value;
2267                                 goto exit;
2268                         }
2269                 return -EINVAL;
2270         } else
2271                 err = s->get_ctrl(cam, &ctrl);
2272
2273 exit:
2274         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
2275                 return -EFAULT;
2276
2277         PDBGG("VIDIOC_G_CTRL: id %lu, value %lu",
2278               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
2279
2280         return err;
2281 }
2282
2283
2284 static int
2285 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
2286 {
2287         struct sn9c102_sensor* s = &cam->sensor;
2288         struct v4l2_control ctrl;
2289         u8 i;
2290         int err = 0;
2291
2292         if (!s->set_ctrl)
2293                 return -EINVAL;
2294
2295         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2296                 return -EFAULT;
2297
2298         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2299                 if (ctrl.id == s->qctrl[i].id) {
2300                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
2301                                 return -EINVAL;
2302                         if (ctrl.value < s->qctrl[i].minimum ||
2303                             ctrl.value > s->qctrl[i].maximum)
2304                                 return -ERANGE;
2305                         ctrl.value -= ctrl.value % s->qctrl[i].step;
2306                         break;
2307                 }
2308
2309         if ((err = s->set_ctrl(cam, &ctrl)))
2310                 return err;
2311
2312         s->_qctrl[i].default_value = ctrl.value;
2313
2314         PDBGG("VIDIOC_S_CTRL: id %lu, value %lu",
2315               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
2316
2317         return 0;
2318 }
2319
2320
2321 static int
2322 sn9c102_vidioc_cropcap(struct sn9c102_device* cam, void __user * arg)
2323 {
2324         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
2325
2326         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2327         cc->pixelaspect.numerator = 1;
2328         cc->pixelaspect.denominator = 1;
2329
2330         if (copy_to_user(arg, cc, sizeof(*cc)))
2331                 return -EFAULT;
2332
2333         return 0;
2334 }
2335
2336
2337 static int
2338 sn9c102_vidioc_g_crop(struct sn9c102_device* cam, void __user * arg)
2339 {
2340         struct sn9c102_sensor* s = &cam->sensor;
2341         struct v4l2_crop crop = {
2342                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2343         };
2344
2345         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
2346
2347         if (copy_to_user(arg, &crop, sizeof(crop)))
2348                 return -EFAULT;
2349
2350         return 0;
2351 }
2352
2353
2354 static int
2355 sn9c102_vidioc_s_crop(struct sn9c102_device* cam, void __user * arg)
2356 {
2357         struct sn9c102_sensor* s = &cam->sensor;
2358         struct v4l2_crop crop;
2359         struct v4l2_rect* rect;
2360         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2361         struct v4l2_pix_format* pix_format = &(s->pix_format);
2362         u8 scale;
2363         const enum sn9c102_stream_state stream = cam->stream;
2364         const u32 nbuffers = cam->nbuffers;
2365         u32 i;
2366         int err = 0;
2367
2368         if (copy_from_user(&crop, arg, sizeof(crop)))
2369                 return -EFAULT;
2370
2371         rect = &(crop.c);
2372
2373         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2374                 return -EINVAL;
2375
2376         if (cam->module_param.force_munmap)
2377                 for (i = 0; i < cam->nbuffers; i++)
2378                         if (cam->frame[i].vma_use_count) {
2379                                 DBG(3, "VIDIOC_S_CROP failed. "
2380                                        "Unmap the buffers first.");
2381                                 return -EBUSY;
2382                         }
2383
2384         /* Preserve R,G or B origin */
2385         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
2386         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
2387
2388         if (rect->width < 16)
2389                 rect->width = 16;
2390         if (rect->height < 16)
2391                 rect->height = 16;
2392         if (rect->width > bounds->width)
2393                 rect->width = bounds->width;
2394         if (rect->height > bounds->height)
2395                 rect->height = bounds->height;
2396         if (rect->left < bounds->left)
2397                 rect->left = bounds->left;
2398         if (rect->top < bounds->top)
2399                 rect->top = bounds->top;
2400         if (rect->left + rect->width > bounds->left + bounds->width)
2401                 rect->left = bounds->left+bounds->width - rect->width;
2402         if (rect->top + rect->height > bounds->top + bounds->height)
2403                 rect->top = bounds->top+bounds->height - rect->height;
2404
2405         rect->width &= ~15L;
2406         rect->height &= ~15L;
2407
2408         if (SN9C102_PRESERVE_IMGSCALE) {
2409                 /* Calculate the actual scaling factor */
2410                 u32 a, b;
2411                 a = rect->width * rect->height;
2412                 b = pix_format->width * pix_format->height;
2413                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2414         } else
2415                 scale = 1;
2416
2417         if (cam->stream == STREAM_ON)
2418                 if ((err = sn9c102_stream_interrupt(cam)))
2419                         return err;
2420
2421         if (copy_to_user(arg, &crop, sizeof(crop))) {
2422                 cam->stream = stream;
2423                 return -EFAULT;
2424         }
2425
2426         if (cam->module_param.force_munmap || cam->io == IO_READ)
2427                 sn9c102_release_buffers(cam);
2428
2429         err = sn9c102_set_crop(cam, rect);
2430         if (s->set_crop)
2431                 err += s->set_crop(cam, rect);
2432         err += sn9c102_set_scale(cam, scale);
2433
2434         if (err) { /* atomic, no rollback in ioctl() */
2435                 cam->state |= DEV_MISCONFIGURED;
2436                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
2437                        "use the camera, close and open %s again.",
2438                     video_device_node_name(cam->v4ldev));
2439                 return -EIO;
2440         }
2441
2442         s->pix_format.width = rect->width/scale;
2443         s->pix_format.height = rect->height/scale;
2444         memcpy(&(s->_rect), rect, sizeof(*rect));
2445
2446         if ((cam->module_param.force_munmap || cam->io == IO_READ) &&
2447             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2448                 cam->state |= DEV_MISCONFIGURED;
2449                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
2450                        "use the camera, close and open %s again.",
2451                     video_device_node_name(cam->v4ldev));
2452                 return -ENOMEM;
2453         }
2454
2455         if (cam->io == IO_READ)
2456                 sn9c102_empty_framequeues(cam);
2457         else if (cam->module_param.force_munmap)
2458                 sn9c102_requeue_outqueue(cam);
2459
2460         cam->stream = stream;
2461
2462         return 0;
2463 }
2464
2465
2466 static int
2467 sn9c102_vidioc_enum_framesizes(struct sn9c102_device* cam, void __user * arg)
2468 {
2469         struct v4l2_frmsizeenum frmsize;
2470
2471         if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
2472                 return -EFAULT;
2473
2474         if (frmsize.index != 0)
2475                 return -EINVAL;
2476
2477         switch (cam->bridge) {
2478         case BRIDGE_SN9C101:
2479         case BRIDGE_SN9C102:
2480         case BRIDGE_SN9C103:
2481                 if (frmsize.pixel_format != V4L2_PIX_FMT_SN9C10X &&
2482                     frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
2483                         return -EINVAL;
2484         case BRIDGE_SN9C105:
2485         case BRIDGE_SN9C120:
2486                 if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG &&
2487                     frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
2488                         return -EINVAL;
2489         }
2490
2491         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
2492         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
2493         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
2494         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
2495         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
2496         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
2497
2498         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
2499                 return -EFAULT;
2500
2501         return 0;
2502 }
2503
2504
2505 static int
2506 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2507 {
2508         struct v4l2_fmtdesc fmtd;
2509
2510         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2511                 return -EFAULT;
2512
2513         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2514                 return -EINVAL;
2515
2516         if (fmtd.index == 0) {
2517                 strcpy(fmtd.description, "bayer rgb");
2518                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2519         } else if (fmtd.index == 1) {
2520                 switch (cam->bridge) {
2521                 case BRIDGE_SN9C101:
2522                 case BRIDGE_SN9C102:
2523                 case BRIDGE_SN9C103:
2524                         strcpy(fmtd.description, "compressed");
2525                         fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2526                         break;
2527                 case BRIDGE_SN9C105:
2528                 case BRIDGE_SN9C120:
2529                         strcpy(fmtd.description, "JPEG");
2530                         fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
2531                         break;
2532                 }
2533                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2534         } else
2535                 return -EINVAL;
2536
2537         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2538         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2539
2540         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2541                 return -EFAULT;
2542
2543         return 0;
2544 }
2545
2546
2547 static int
2548 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2549 {
2550         struct v4l2_format format;
2551         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
2552
2553         if (copy_from_user(&format, arg, sizeof(format)))
2554                 return -EFAULT;
2555
2556         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2557                 return -EINVAL;
2558
2559         pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_JPEG) ?
2560                            V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2561         pfmt->bytesperline = (pfmt->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2562                               pfmt->pixelformat == V4L2_PIX_FMT_JPEG)
2563                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2564         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2565         pfmt->field = V4L2_FIELD_NONE;
2566         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2567
2568         if (copy_to_user(arg, &format, sizeof(format)))
2569                 return -EFAULT;
2570
2571         return 0;
2572 }
2573
2574
2575 static int
2576 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2577                          void __user * arg)
2578 {
2579         struct sn9c102_sensor* s = &cam->sensor;
2580         struct v4l2_format format;
2581         struct v4l2_pix_format* pix;
2582         struct v4l2_pix_format* pfmt = &(s->pix_format);
2583         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2584         struct v4l2_rect rect;
2585         u8 scale;
2586         const enum sn9c102_stream_state stream = cam->stream;
2587         const u32 nbuffers = cam->nbuffers;
2588         u32 i;
2589         int err = 0;
2590
2591         if (copy_from_user(&format, arg, sizeof(format)))
2592                 return -EFAULT;
2593
2594         pix = &(format.fmt.pix);
2595
2596         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2597                 return -EINVAL;
2598
2599         memcpy(&rect, &(s->_rect), sizeof(rect));
2600
2601         { /* calculate the actual scaling factor */
2602                 u32 a, b;
2603                 a = rect.width * rect.height;
2604                 b = pix->width * pix->height;
2605                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2606         }
2607
2608         rect.width = scale * pix->width;
2609         rect.height = scale * pix->height;
2610
2611         if (rect.width < 16)
2612                 rect.width = 16;
2613         if (rect.height < 16)
2614                 rect.height = 16;
2615         if (rect.width > bounds->left + bounds->width - rect.left)
2616                 rect.width = bounds->left + bounds->width - rect.left;
2617         if (rect.height > bounds->top + bounds->height - rect.top)
2618                 rect.height = bounds->top + bounds->height - rect.top;
2619
2620         rect.width &= ~15L;
2621         rect.height &= ~15L;
2622
2623         { /* adjust the scaling factor */
2624                 u32 a, b;
2625                 a = rect.width * rect.height;
2626                 b = pix->width * pix->height;
2627                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2628         }
2629
2630         pix->width = rect.width / scale;
2631         pix->height = rect.height / scale;
2632
2633         switch (cam->bridge) {
2634         case BRIDGE_SN9C101:
2635         case BRIDGE_SN9C102:
2636         case BRIDGE_SN9C103:
2637                 if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2638                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2639                         pix->pixelformat = pfmt->pixelformat;
2640                 break;
2641         case BRIDGE_SN9C105:
2642         case BRIDGE_SN9C120:
2643                 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
2644                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2645                         pix->pixelformat = pfmt->pixelformat;
2646                 break;
2647         }
2648         pix->priv = pfmt->priv; /* bpp */
2649         pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_JPEG) ?
2650                           V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2651         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2652                              pix->pixelformat == V4L2_PIX_FMT_JPEG)
2653                             ? 0 : (pix->width * pix->priv) / 8;
2654         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2655         pix->field = V4L2_FIELD_NONE;
2656
2657         if (cmd == VIDIOC_TRY_FMT) {
2658                 if (copy_to_user(arg, &format, sizeof(format)))
2659                         return -EFAULT;
2660                 return 0;
2661         }
2662
2663         if (cam->module_param.force_munmap)
2664                 for (i = 0; i < cam->nbuffers; i++)
2665                         if (cam->frame[i].vma_use_count) {
2666                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2667                                        "buffers first.");
2668                                 return -EBUSY;
2669                         }
2670
2671         if (cam->stream == STREAM_ON)
2672                 if ((err = sn9c102_stream_interrupt(cam)))
2673                         return err;
2674
2675         if (copy_to_user(arg, &format, sizeof(format))) {
2676                 cam->stream = stream;
2677                 return -EFAULT;
2678         }
2679
2680         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2681                 sn9c102_release_buffers(cam);
2682
2683         err += sn9c102_set_pix_format(cam, pix);
2684         err += sn9c102_set_crop(cam, &rect);
2685         if (s->set_pix_format)
2686                 err += s->set_pix_format(cam, pix);
2687         if (s->set_crop)
2688                 err += s->set_crop(cam, &rect);
2689         err += sn9c102_set_scale(cam, scale);
2690
2691         if (err) { /* atomic, no rollback in ioctl() */
2692                 cam->state |= DEV_MISCONFIGURED;
2693                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2694                        "use the camera, close and open %s again.",
2695                     video_device_node_name(cam->v4ldev));
2696                 return -EIO;
2697         }
2698
2699         memcpy(pfmt, pix, sizeof(*pix));
2700         memcpy(&(s->_rect), &rect, sizeof(rect));
2701
2702         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2703             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2704                 cam->state |= DEV_MISCONFIGURED;
2705                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2706                        "use the camera, close and open %s again.",
2707                     video_device_node_name(cam->v4ldev));
2708                 return -ENOMEM;
2709         }
2710
2711         if (cam->io == IO_READ)
2712                 sn9c102_empty_framequeues(cam);
2713         else if (cam->module_param.force_munmap)
2714                 sn9c102_requeue_outqueue(cam);
2715
2716         cam->stream = stream;
2717
2718         return 0;
2719 }
2720
2721
2722 static int
2723 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2724 {
2725         if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
2726                 return -EFAULT;
2727
2728         return 0;
2729 }
2730
2731
2732 static int
2733 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2734 {
2735         struct v4l2_jpegcompression jc;
2736         const enum sn9c102_stream_state stream = cam->stream;
2737         int err = 0;
2738
2739         if (copy_from_user(&jc, arg, sizeof(jc)))
2740                 return -EFAULT;
2741
2742         if (jc.quality != 0 && jc.quality != 1)
2743                 return -EINVAL;
2744
2745         if (cam->stream == STREAM_ON)
2746                 if ((err = sn9c102_stream_interrupt(cam)))
2747                         return err;
2748
2749         err += sn9c102_set_compression(cam, &jc);
2750         if (err) { /* atomic, no rollback in ioctl() */
2751                 cam->state |= DEV_MISCONFIGURED;
2752                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware problems. "
2753                        "To use the camera, close and open %s again.",
2754                     video_device_node_name(cam->v4ldev));
2755                 return -EIO;
2756         }
2757
2758         cam->compression.quality = jc.quality;
2759
2760         cam->stream = stream;
2761
2762         return 0;
2763 }
2764
2765
2766 static int
2767 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2768 {
2769         struct v4l2_requestbuffers rb;
2770         u32 i;
2771         int err;
2772
2773         if (copy_from_user(&rb, arg, sizeof(rb)))
2774                 return -EFAULT;
2775
2776         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2777             rb.memory != V4L2_MEMORY_MMAP)
2778                 return -EINVAL;
2779
2780         if (cam->io == IO_READ) {
2781                 DBG(3, "Close and open the device again to choose the mmap "
2782                        "I/O method");
2783                 return -EBUSY;
2784         }
2785
2786         for (i = 0; i < cam->nbuffers; i++)
2787                 if (cam->frame[i].vma_use_count) {
2788                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2789                                "still mapped.");
2790                         return -EBUSY;
2791                 }
2792
2793         if (cam->stream == STREAM_ON)
2794                 if ((err = sn9c102_stream_interrupt(cam)))
2795                         return err;
2796
2797         sn9c102_empty_framequeues(cam);
2798
2799         sn9c102_release_buffers(cam);
2800         if (rb.count)
2801                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2802
2803         if (copy_to_user(arg, &rb, sizeof(rb))) {
2804                 sn9c102_release_buffers(cam);
2805                 cam->io = IO_NONE;
2806                 return -EFAULT;
2807         }
2808
2809         cam->io = rb.count ? IO_MMAP : IO_NONE;
2810
2811         return 0;
2812 }
2813
2814
2815 static int
2816 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2817 {
2818         struct v4l2_buffer b;
2819
2820         if (copy_from_user(&b, arg, sizeof(b)))
2821                 return -EFAULT;
2822
2823         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2824             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2825                 return -EINVAL;
2826
2827         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2828
2829         if (cam->frame[b.index].vma_use_count)
2830                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2831
2832         if (cam->frame[b.index].state == F_DONE)
2833                 b.flags |= V4L2_BUF_FLAG_DONE;
2834         else if (cam->frame[b.index].state != F_UNUSED)
2835                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2836
2837         if (copy_to_user(arg, &b, sizeof(b)))
2838                 return -EFAULT;
2839
2840         return 0;
2841 }
2842
2843
2844 static int
2845 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2846 {
2847         struct v4l2_buffer b;
2848         unsigned long lock_flags;
2849
2850         if (copy_from_user(&b, arg, sizeof(b)))
2851                 return -EFAULT;
2852
2853         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2854             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2855                 return -EINVAL;
2856
2857         if (cam->frame[b.index].state != F_UNUSED)
2858                 return -EINVAL;
2859
2860         cam->frame[b.index].state = F_QUEUED;
2861
2862         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2863         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2864         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2865
2866         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2867
2868         return 0;
2869 }
2870
2871
2872 static int
2873 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2874                      void __user * arg)
2875 {
2876         struct v4l2_buffer b;
2877         struct sn9c102_frame_t *f;
2878         unsigned long lock_flags;
2879         long timeout;
2880         int err = 0;
2881
2882         if (copy_from_user(&b, arg, sizeof(b)))
2883                 return -EFAULT;
2884
2885         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2886                 return -EINVAL;
2887
2888         if (list_empty(&cam->outqueue)) {
2889                 if (cam->stream == STREAM_OFF)
2890                         return -EINVAL;
2891                 if (filp->f_flags & O_NONBLOCK)
2892                         return -EAGAIN;
2893                 if (!cam->module_param.frame_timeout) {
2894                         err = wait_event_interruptible
2895                               ( cam->wait_frame,
2896                                 (!list_empty(&cam->outqueue)) ||
2897                                 (cam->state & DEV_DISCONNECTED) ||
2898                                 (cam->state & DEV_MISCONFIGURED) );
2899                         if (err)
2900                                 return err;
2901                 } else {
2902                         timeout = wait_event_interruptible_timeout
2903                                   ( cam->wait_frame,
2904                                     (!list_empty(&cam->outqueue)) ||
2905                                     (cam->state & DEV_DISCONNECTED) ||
2906                                     (cam->state & DEV_MISCONFIGURED),
2907                                     cam->module_param.frame_timeout *
2908                                     1000 * msecs_to_jiffies(1) );
2909                         if (timeout < 0)
2910                                 return timeout;
2911                         else if (timeout == 0 &&
2912                                  !(cam->state & DEV_DISCONNECTED)) {
2913                                 DBG(1, "Video frame timeout elapsed");
2914                                 return -EIO;
2915                         }
2916                 }
2917                 if (cam->state & DEV_DISCONNECTED)
2918                         return -ENODEV;
2919                 if (cam->state & DEV_MISCONFIGURED)
2920                         return -EIO;
2921         }
2922
2923         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2924         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2925         list_del(cam->outqueue.next);
2926         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2927
2928         f->state = F_UNUSED;
2929
2930         memcpy(&b, &f->buf, sizeof(b));
2931         if (f->vma_use_count)
2932                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2933
2934         if (copy_to_user(arg, &b, sizeof(b)))
2935                 return -EFAULT;
2936
2937         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2938
2939         return 0;
2940 }
2941
2942
2943 static int
2944 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2945 {
2946         int type;
2947
2948         if (copy_from_user(&type, arg, sizeof(type)))
2949                 return -EFAULT;
2950
2951         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2952                 return -EINVAL;
2953
2954         cam->stream = STREAM_ON;
2955
2956         DBG(3, "Stream on");
2957
2958         return 0;
2959 }
2960
2961
2962 static int
2963 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2964 {
2965         int type, err;
2966
2967         if (copy_from_user(&type, arg, sizeof(type)))
2968                 return -EFAULT;
2969
2970         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2971                 return -EINVAL;
2972
2973         if (cam->stream == STREAM_ON)
2974                 if ((err = sn9c102_stream_interrupt(cam)))
2975                         return err;
2976
2977         sn9c102_empty_framequeues(cam);
2978
2979         DBG(3, "Stream off");
2980
2981         return 0;
2982 }
2983
2984
2985 static int
2986 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2987 {
2988         struct v4l2_streamparm sp;
2989
2990         if (copy_from_user(&sp, arg, sizeof(sp)))
2991                 return -EFAULT;
2992
2993         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2994                 return -EINVAL;
2995
2996         sp.parm.capture.extendedmode = 0;
2997         sp.parm.capture.readbuffers = cam->nreadbuffers;
2998
2999         if (copy_to_user(arg, &sp, sizeof(sp)))
3000                 return -EFAULT;
3001
3002         return 0;
3003 }
3004
3005
3006 static int
3007 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
3008 {
3009         struct v4l2_streamparm sp;
3010
3011         if (copy_from_user(&sp, arg, sizeof(sp)))
3012                 return -EFAULT;
3013
3014         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
3015                 return -EINVAL;
3016
3017         sp.parm.capture.extendedmode = 0;
3018
3019         if (sp.parm.capture.readbuffers == 0)
3020                 sp.parm.capture.readbuffers = cam->nreadbuffers;
3021
3022         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
3023                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
3024
3025         if (copy_to_user(arg, &sp, sizeof(sp)))
3026                 return -EFAULT;
3027
3028         cam->nreadbuffers = sp.parm.capture.readbuffers;
3029
3030         return 0;
3031 }
3032
3033
3034 static int
3035 sn9c102_vidioc_enumaudio(struct sn9c102_device* cam, void __user * arg)
3036 {
3037         struct v4l2_audio audio;
3038
3039         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3040                 return -EINVAL;
3041
3042         if (copy_from_user(&audio, arg, sizeof(audio)))
3043                 return -EFAULT;
3044
3045         if (audio.index != 0)
3046                 return -EINVAL;
3047
3048         strcpy(audio.name, "Microphone");
3049         audio.capability = 0;
3050         audio.mode = 0;
3051
3052         if (copy_to_user(arg, &audio, sizeof(audio)))
3053                 return -EFAULT;
3054
3055         return 0;
3056 }
3057
3058
3059 static int
3060 sn9c102_vidioc_g_audio(struct sn9c102_device* cam, void __user * arg)
3061 {
3062         struct v4l2_audio audio;
3063
3064         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3065                 return -EINVAL;
3066
3067         if (copy_from_user(&audio, arg, sizeof(audio)))
3068                 return -EFAULT;
3069
3070         memset(&audio, 0, sizeof(audio));
3071         strcpy(audio.name, "Microphone");
3072
3073         if (copy_to_user(arg, &audio, sizeof(audio)))
3074                 return -EFAULT;
3075
3076         return 0;
3077 }
3078
3079
3080 static int
3081 sn9c102_vidioc_s_audio(struct sn9c102_device* cam, void __user * arg)
3082 {
3083         struct v4l2_audio audio;
3084
3085         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3086                 return -EINVAL;
3087
3088         if (copy_from_user(&audio, arg, sizeof(audio)))
3089                 return -EFAULT;
3090
3091         if (audio.index != 0)
3092                 return -EINVAL;
3093
3094         return 0;
3095 }
3096
3097
3098 static long sn9c102_ioctl_v4l2(struct file *filp,
3099                               unsigned int cmd, void __user *arg)
3100 {
3101         struct sn9c102_device *cam = video_drvdata(filp);
3102
3103         switch (cmd) {
3104
3105         case VIDIOC_QUERYCAP:
3106                 return sn9c102_vidioc_querycap(cam, arg);
3107
3108         case VIDIOC_ENUMINPUT:
3109                 return sn9c102_vidioc_enuminput(cam, arg);
3110
3111         case VIDIOC_G_INPUT:
3112                 return sn9c102_vidioc_g_input(cam, arg);
3113
3114         case VIDIOC_S_INPUT:
3115                 return sn9c102_vidioc_s_input(cam, arg);
3116
3117         case VIDIOC_QUERYCTRL:
3118                 return sn9c102_vidioc_query_ctrl(cam, arg);
3119
3120         case VIDIOC_G_CTRL:
3121                 return sn9c102_vidioc_g_ctrl(cam, arg);
3122
3123         case VIDIOC_S_CTRL:
3124                 return sn9c102_vidioc_s_ctrl(cam, arg);
3125
3126         case VIDIOC_CROPCAP:
3127                 return sn9c102_vidioc_cropcap(cam, arg);
3128
3129         case VIDIOC_G_CROP:
3130                 return sn9c102_vidioc_g_crop(cam, arg);
3131
3132         case VIDIOC_S_CROP:
3133                 return sn9c102_vidioc_s_crop(cam, arg);
3134
3135         case VIDIOC_ENUM_FRAMESIZES:
3136                 return sn9c102_vidioc_enum_framesizes(cam, arg);
3137
3138         case VIDIOC_ENUM_FMT:
3139                 return sn9c102_vidioc_enum_fmt(cam, arg);
3140
3141         case VIDIOC_G_FMT:
3142                 return sn9c102_vidioc_g_fmt(cam, arg);
3143
3144         case VIDIOC_TRY_FMT:
3145         case VIDIOC_S_FMT:
3146                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
3147
3148         case VIDIOC_G_JPEGCOMP:
3149                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
3150
3151         case VIDIOC_S_JPEGCOMP:
3152                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
3153
3154         case VIDIOC_REQBUFS:
3155                 return sn9c102_vidioc_reqbufs(cam, arg);
3156
3157         case VIDIOC_QUERYBUF:
3158                 return sn9c102_vidioc_querybuf(cam, arg);
3159
3160         case VIDIOC_QBUF:
3161                 return sn9c102_vidioc_qbuf(cam, arg);
3162
3163         case VIDIOC_DQBUF:
3164                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
3165
3166         case VIDIOC_STREAMON:
3167                 return sn9c102_vidioc_streamon(cam, arg);
3168
3169         case VIDIOC_STREAMOFF:
3170                 return sn9c102_vidioc_streamoff(cam, arg);
3171
3172         case VIDIOC_G_PARM:
3173                 return sn9c102_vidioc_g_parm(cam, arg);
3174
3175         case VIDIOC_S_PARM:
3176                 return sn9c102_vidioc_s_parm(cam, arg);
3177
3178         case VIDIOC_ENUMAUDIO:
3179                 return sn9c102_vidioc_enumaudio(cam, arg);
3180
3181         case VIDIOC_G_AUDIO:
3182                 return sn9c102_vidioc_g_audio(cam, arg);
3183
3184         case VIDIOC_S_AUDIO:
3185                 return sn9c102_vidioc_s_audio(cam, arg);
3186
3187         case VIDIOC_G_STD:
3188         case VIDIOC_S_STD:
3189         case VIDIOC_QUERYSTD:
3190         case VIDIOC_ENUMSTD:
3191         case VIDIOC_QUERYMENU:
3192         case VIDIOC_ENUM_FRAMEINTERVALS:
3193                 return -EINVAL;
3194
3195         default:
3196                 return -EINVAL;
3197
3198         }
3199 }
3200
3201
3202 static long sn9c102_ioctl(struct file *filp,
3203                          unsigned int cmd, unsigned long arg)
3204 {
3205         struct sn9c102_device *cam = video_drvdata(filp);
3206         int err = 0;
3207
3208         if (mutex_lock_interruptible(&cam->fileop_mutex))
3209                 return -ERESTARTSYS;
3210
3211         if (cam->state & DEV_DISCONNECTED) {
3212                 DBG(1, "Device not present");
3213                 mutex_unlock(&cam->fileop_mutex);
3214                 return -ENODEV;
3215         }
3216
3217         if (cam->state & DEV_MISCONFIGURED) {
3218                 DBG(1, "The camera is misconfigured. Close and open it "
3219                        "again.");
3220                 mutex_unlock(&cam->fileop_mutex);
3221                 return -EIO;
3222         }
3223
3224         V4LDBG(3, "sn9c102", cmd);
3225
3226         err = sn9c102_ioctl_v4l2(filp, cmd, (void __user *)arg);
3227
3228         mutex_unlock(&cam->fileop_mutex);
3229
3230         return err;
3231 }
3232
3233 /*****************************************************************************/
3234
3235 static const struct v4l2_file_operations sn9c102_fops = {
3236         .owner = THIS_MODULE,
3237         .open = sn9c102_open,
3238         .release = sn9c102_release,
3239         .ioctl = sn9c102_ioctl,
3240         .read = sn9c102_read,
3241         .poll = sn9c102_poll,
3242         .mmap = sn9c102_mmap,
3243 };
3244
3245 /*****************************************************************************/
3246
3247 /* It exists a single interface only. We do not need to validate anything. */
3248 static int
3249 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
3250 {
3251         struct usb_device *udev = interface_to_usbdev(intf);
3252         struct sn9c102_device* cam;
3253         static unsigned int dev_nr;
3254         unsigned int i;
3255         int err = 0, r;
3256
3257         if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
3258                 return -ENOMEM;
3259
3260         cam->usbdev = udev;
3261
3262         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
3263                 DBG(1, "kzalloc() failed");
3264                 err = -ENOMEM;
3265                 goto fail;
3266         }
3267
3268         if (!(cam->v4ldev = video_device_alloc())) {
3269                 DBG(1, "video_device_alloc() failed");
3270                 err = -ENOMEM;
3271                 goto fail;
3272         }
3273
3274         r = sn9c102_read_reg(cam, 0x00);
3275         if (r < 0 || (r != 0x10 && r != 0x11 && r != 0x12)) {
3276                 DBG(1, "Sorry, this is not a SN9C1xx-based camera "
3277                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3278                 err = -ENODEV;
3279                 goto fail;
3280         }
3281
3282         cam->bridge = id->driver_info;
3283         switch (cam->bridge) {
3284         case BRIDGE_SN9C101:
3285         case BRIDGE_SN9C102:
3286                 DBG(2, "SN9C10[12] PC Camera Controller detected "
3287                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3288                 break;
3289         case BRIDGE_SN9C103:
3290                 DBG(2, "SN9C103 PC Camera Controller detected "
3291                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3292                 break;
3293         case BRIDGE_SN9C105:
3294                 DBG(2, "SN9C105 PC Camera Controller detected "
3295                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3296                 break;
3297         case BRIDGE_SN9C120:
3298                 DBG(2, "SN9C120 PC Camera Controller detected "
3299                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3300                 break;
3301         }
3302
3303         for  (i = 0; i < ARRAY_SIZE(sn9c102_sensor_table); i++) {
3304                 err = sn9c102_sensor_table[i](cam);
3305                 if (!err)
3306                         break;
3307         }
3308
3309         if (!err) {
3310                 DBG(2, "%s image sensor detected", cam->sensor.name);
3311                 DBG(3, "Support for %s maintained by %s",
3312                     cam->sensor.name, cam->sensor.maintainer);
3313         } else {
3314                 DBG(1, "No supported image sensor detected for this bridge");
3315                 err = -ENODEV;
3316                 goto fail;
3317         }
3318
3319         if (!(cam->bridge & cam->sensor.supported_bridge)) {
3320                 DBG(1, "Bridge not supported");
3321                 err = -ENODEV;
3322                 goto fail;
3323         }
3324
3325         if (sn9c102_init(cam)) {
3326                 DBG(1, "Initialization failed. I will retry on open().");
3327                 cam->state |= DEV_MISCONFIGURED;
3328         }
3329
3330         strcpy(cam->v4ldev->name, "SN9C1xx PC Camera");
3331         cam->v4ldev->fops = &sn9c102_fops;
3332         cam->v4ldev->release = video_device_release;
3333         cam->v4ldev->parent = &udev->dev;
3334
3335         init_completion(&cam->probe);
3336
3337         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
3338                                     video_nr[dev_nr]);
3339         if (err) {
3340                 DBG(1, "V4L2 device registration failed");
3341                 if (err == -ENFILE && video_nr[dev_nr] == -1)
3342                         DBG(1, "Free /dev/videoX node not found");
3343                 video_nr[dev_nr] = -1;
3344                 dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3345                 complete_all(&cam->probe);
3346                 goto fail;
3347         }
3348
3349         DBG(2, "V4L2 device registered as %s",
3350             video_device_node_name(cam->v4ldev));
3351
3352         video_set_drvdata(cam->v4ldev, cam);
3353         cam->module_param.force_munmap = force_munmap[dev_nr];
3354         cam->module_param.frame_timeout = frame_timeout[dev_nr];
3355
3356         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3357
3358 #ifdef CONFIG_VIDEO_ADV_DEBUG
3359         err = sn9c102_create_sysfs(cam);
3360         if (!err)
3361                 DBG(2, "Optional device control through 'sysfs' "
3362                        "interface ready");
3363         else
3364                 DBG(2, "Failed to create optional 'sysfs' interface for "
3365                        "device controlling. Error #%d", err);
3366 #else
3367         DBG(2, "Optional device control through 'sysfs' interface disabled");
3368         DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
3369                "configuration option to enable it.");
3370 #endif
3371
3372         usb_set_intfdata(intf, cam);
3373         kref_init(&cam->kref);
3374         usb_get_dev(cam->usbdev);
3375
3376         complete_all(&cam->probe);
3377
3378         return 0;
3379
3380 fail:
3381         if (cam) {
3382                 kfree(cam->control_buffer);
3383                 if (cam->v4ldev)
3384                         video_device_release(cam->v4ldev);
3385                 kfree(cam);
3386         }
3387         return err;
3388 }
3389
3390
3391 static void sn9c102_usb_disconnect(struct usb_interface* intf)
3392 {
3393         struct sn9c102_device* cam;
3394
3395         down_write(&sn9c102_dev_lock);
3396
3397         cam = usb_get_intfdata(intf);
3398
3399         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
3400
3401         if (cam->users) {
3402                 DBG(2, "Device %s is open! Deregistration and memory "
3403                        "deallocation are deferred.",
3404                     video_device_node_name(cam->v4ldev));
3405                 cam->state |= DEV_MISCONFIGURED;
3406                 sn9c102_stop_transfer(cam);
3407                 cam->state |= DEV_DISCONNECTED;
3408                 wake_up_interruptible(&cam->wait_frame);
3409                 wake_up(&cam->wait_stream);
3410         } else
3411                 cam->state |= DEV_DISCONNECTED;
3412
3413         wake_up_interruptible_all(&cam->wait_open);
3414
3415         kref_put(&cam->kref, sn9c102_release_resources);
3416
3417         up_write(&sn9c102_dev_lock);
3418 }
3419
3420
3421 static struct usb_driver sn9c102_usb_driver = {
3422         .name =       "sn9c102",
3423         .id_table =   sn9c102_id_table,
3424         .probe =      sn9c102_usb_probe,
3425         .disconnect = sn9c102_usb_disconnect,
3426 };
3427
3428 /*****************************************************************************/
3429
3430 static int __init sn9c102_module_init(void)
3431 {
3432         int err = 0;
3433
3434         KDBG(2, SN9C102_MODULE_NAME " v" SN9C102_MODULE_VERSION);
3435         KDBG(3, SN9C102_MODULE_AUTHOR);
3436
3437         if ((err = usb_register(&sn9c102_usb_driver)))
3438                 KDBG(1, "usb_register() failed");
3439
3440         return err;
3441 }
3442
3443
3444 static void __exit sn9c102_module_exit(void)
3445 {
3446         usb_deregister(&sn9c102_usb_driver);
3447 }
3448
3449
3450 module_init(sn9c102_module_init);
3451 module_exit(sn9c102_module_exit);