Pileus Git - ~andy/linux/blob - drivers/media/usb/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/version.h>
  37 #include <linux/page-flags.h>
  38 #include <asm/byteorder.h>
  39 #include <asm/page.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "sn9c102.h"
  43
  44 /*****************************************************************************/
  45
  46 #define SN9C102_MODULE_NAME     "V4L2 driver for SN9C1xx PC Camera Controllers"
  47 #define SN9C102_MODULE_ALIAS    "sn9c1xx"
  48 #define SN9C102_MODULE_AUTHOR   "(C) 2004-2007 Luca Risolia"
  49 #define SN9C102_AUTHOR_EMAIL    "<luca.risolia@studio.unibo.it>"
  50 #define SN9C102_MODULE_LICENSE  "GPL"
  51 #define SN9C102_MODULE_VERSION  "1:1.48"
  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 bool 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         cam->stream = STREAM_INTERRUPT;
 999         wait_event_timeout(cam->wait_stream,
1000                                      (cam->stream == STREAM_OFF) ||
1001                                      (cam->state & DEV_DISCONNECTED),
1002                                      SN9C102_URB_TIMEOUT);
1003         if (cam->state & DEV_DISCONNECTED)
1004                 return -ENODEV;
1005         else if (cam->stream != STREAM_OFF) {
1006                 cam->state |= DEV_MISCONFIGURED;
1007                 DBG(1, "URB timeout reached. The camera is misconfigured. "
1008                        "To use it, close and open %s again.",
1009                     video_device_node_name(cam->v4ldev));
1010                 return -EIO;
1011         }
1012
1013         return 0;
1014 }
1015
1016 /*****************************************************************************/
1017
1018 #ifdef CONFIG_VIDEO_ADV_DEBUG
1019 static u16 sn9c102_strtou16(const char* buff, size_t len, ssize_t* count)
1020 {
1021         char str[7];
1022         char* endp;
1023         unsigned long val;
1024
1025         if (len < 6) {
1026                 strncpy(str, buff, len);
1027                 str[len] = '\0';
1028         } else {
1029                 strncpy(str, buff, 6);
1030                 str[6] = '\0';
1031         }
1032
1033         val = simple_strtoul(str, &endp, 0);
1034
1035         *count = 0;
1036         if (val <= 0xffff)
1037                 *count = (ssize_t)(endp - str);
1038         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
1039                 *count += 1;
1040
1041         return (u16)val;
1042 }
1043
1044 /*
1045    NOTE 1: being inside one of the following methods implies that the v4l
1046            device exists for sure (see kobjects and reference counters)
1047    NOTE 2: buffers are PAGE_SIZE long
1048 */
1049
1050 static ssize_t sn9c102_show_reg(struct device* cd,
1051                                 struct device_attribute *attr, char* buf)
1052 {
1053         struct sn9c102_device* cam;
1054         ssize_t count;
1055
1056         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1057                 return -ERESTARTSYS;
1058
1059         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1060         if (!cam) {
1061                 mutex_unlock(&sn9c102_sysfs_lock);
1062                 return -ENODEV;
1063         }
1064
1065         count = sprintf(buf, "%u\n", cam->sysfs.reg);
1066
1067         mutex_unlock(&sn9c102_sysfs_lock);
1068
1069         return count;
1070 }
1071
1072
1073 static ssize_t
1074 sn9c102_store_reg(struct device* cd, struct device_attribute *attr,
1075                   const char* buf, size_t len)
1076 {
1077         struct sn9c102_device* cam;
1078         u16 index;
1079         ssize_t count;
1080
1081         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1082                 return -ERESTARTSYS;
1083
1084         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1085         if (!cam) {
1086                 mutex_unlock(&sn9c102_sysfs_lock);
1087                 return -ENODEV;
1088         }
1089
1090         index = sn9c102_strtou16(buf, len, &count);
1091         if (index >= ARRAY_SIZE(cam->reg) || !count) {
1092                 mutex_unlock(&sn9c102_sysfs_lock);
1093                 return -EINVAL;
1094         }
1095
1096         cam->sysfs.reg = index;
1097
1098         DBG(2, "Moved SN9C1XX register index to 0x%02X", cam->sysfs.reg);
1099         DBG(3, "Written bytes: %zd", count);
1100
1101         mutex_unlock(&sn9c102_sysfs_lock);
1102
1103         return count;
1104 }
1105
1106
1107 static ssize_t sn9c102_show_val(struct device* cd,
1108                                 struct device_attribute *attr, char* buf)
1109 {
1110         struct sn9c102_device* cam;
1111         ssize_t count;
1112         int val;
1113
1114         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1115                 return -ERESTARTSYS;
1116
1117         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1118         if (!cam) {
1119                 mutex_unlock(&sn9c102_sysfs_lock);
1120                 return -ENODEV;
1121         }
1122
1123         if ((val = sn9c102_read_reg(cam, cam->sysfs.reg)) < 0) {
1124                 mutex_unlock(&sn9c102_sysfs_lock);
1125                 return -EIO;
1126         }
1127
1128         count = sprintf(buf, "%d\n", val);
1129
1130         DBG(3, "Read bytes: %zd, value: %d", count, val);
1131
1132         mutex_unlock(&sn9c102_sysfs_lock);
1133
1134         return count;
1135 }
1136
1137
1138 static ssize_t
1139 sn9c102_store_val(struct device* cd, struct device_attribute *attr,
1140                   const char* buf, size_t len)
1141 {
1142         struct sn9c102_device* cam;
1143         u16 value;
1144         ssize_t count;
1145         int err;
1146
1147         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1148                 return -ERESTARTSYS;
1149
1150         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1151         if (!cam) {
1152                 mutex_unlock(&sn9c102_sysfs_lock);
1153                 return -ENODEV;
1154         }
1155
1156         value = sn9c102_strtou16(buf, len, &count);
1157         if (!count) {
1158                 mutex_unlock(&sn9c102_sysfs_lock);
1159                 return -EINVAL;
1160         }
1161
1162         err = sn9c102_write_reg(cam, value, cam->sysfs.reg);
1163         if (err) {
1164                 mutex_unlock(&sn9c102_sysfs_lock);
1165                 return -EIO;
1166         }
1167
1168         DBG(2, "Written SN9C1XX reg. 0x%02X, val. 0x%02X",
1169             cam->sysfs.reg, value);
1170         DBG(3, "Written bytes: %zd", count);
1171
1172         mutex_unlock(&sn9c102_sysfs_lock);
1173
1174         return count;
1175 }
1176
1177
1178 static ssize_t sn9c102_show_i2c_reg(struct device* cd,
1179                                     struct device_attribute *attr, char* buf)
1180 {
1181         struct sn9c102_device* cam;
1182         ssize_t count;
1183
1184         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1185                 return -ERESTARTSYS;
1186
1187         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1188         if (!cam) {
1189                 mutex_unlock(&sn9c102_sysfs_lock);
1190                 return -ENODEV;
1191         }
1192
1193         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
1194
1195         DBG(3, "Read bytes: %zd", count);
1196
1197         mutex_unlock(&sn9c102_sysfs_lock);
1198
1199         return count;
1200 }
1201
1202
1203 static ssize_t
1204 sn9c102_store_i2c_reg(struct device* cd, struct device_attribute *attr,
1205                       const char* buf, size_t len)
1206 {
1207         struct sn9c102_device* cam;
1208         u16 index;
1209         ssize_t count;
1210
1211         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1212                 return -ERESTARTSYS;
1213
1214         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1215         if (!cam) {
1216                 mutex_unlock(&sn9c102_sysfs_lock);
1217                 return -ENODEV;
1218         }
1219
1220         index = sn9c102_strtou16(buf, len, &count);
1221         if (!count) {
1222                 mutex_unlock(&sn9c102_sysfs_lock);
1223                 return -EINVAL;
1224         }
1225
1226         cam->sysfs.i2c_reg = index;
1227
1228         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
1229         DBG(3, "Written bytes: %zd", count);
1230
1231         mutex_unlock(&sn9c102_sysfs_lock);
1232
1233         return count;
1234 }
1235
1236
1237 static ssize_t sn9c102_show_i2c_val(struct device* cd,
1238                                     struct device_attribute *attr, char* buf)
1239 {
1240         struct sn9c102_device* cam;
1241         ssize_t count;
1242         int val;
1243
1244         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1245                 return -ERESTARTSYS;
1246
1247         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1248         if (!cam) {
1249                 mutex_unlock(&sn9c102_sysfs_lock);
1250                 return -ENODEV;
1251         }
1252
1253         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_READ)) {
1254                 mutex_unlock(&sn9c102_sysfs_lock);
1255                 return -ENOSYS;
1256         }
1257
1258         if ((val = sn9c102_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
1259                 mutex_unlock(&sn9c102_sysfs_lock);
1260                 return -EIO;
1261         }
1262
1263         count = sprintf(buf, "%d\n", val);
1264
1265         DBG(3, "Read bytes: %zd, value: %d", count, val);
1266
1267         mutex_unlock(&sn9c102_sysfs_lock);
1268
1269         return count;
1270 }
1271
1272
1273 static ssize_t
1274 sn9c102_store_i2c_val(struct device* cd, struct device_attribute *attr,
1275                       const char* buf, size_t len)
1276 {
1277         struct sn9c102_device* cam;
1278         u16 value;
1279         ssize_t count;
1280         int err;
1281
1282         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1283                 return -ERESTARTSYS;
1284
1285         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1286         if (!cam) {
1287                 mutex_unlock(&sn9c102_sysfs_lock);
1288                 return -ENODEV;
1289         }
1290
1291         if (!(cam->sensor.sysfs_ops & SN9C102_I2C_WRITE)) {
1292                 mutex_unlock(&sn9c102_sysfs_lock);
1293                 return -ENOSYS;
1294         }
1295
1296         value = sn9c102_strtou16(buf, len, &count);
1297         if (!count) {
1298                 mutex_unlock(&sn9c102_sysfs_lock);
1299                 return -EINVAL;
1300         }
1301
1302         err = sn9c102_i2c_write(cam, cam->sysfs.i2c_reg, value);
1303         if (err) {
1304                 mutex_unlock(&sn9c102_sysfs_lock);
1305                 return -EIO;
1306         }
1307
1308         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
1309             cam->sysfs.i2c_reg, value);
1310         DBG(3, "Written bytes: %zd", count);
1311
1312         mutex_unlock(&sn9c102_sysfs_lock);
1313
1314         return count;
1315 }
1316
1317
1318 static ssize_t
1319 sn9c102_store_green(struct device* cd, struct device_attribute *attr,
1320                     const char* buf, size_t len)
1321 {
1322         struct sn9c102_device* cam;
1323         enum sn9c102_bridge bridge;
1324         ssize_t res = 0;
1325         u16 value;
1326         ssize_t count;
1327
1328         if (mutex_lock_interruptible(&sn9c102_sysfs_lock))
1329                 return -ERESTARTSYS;
1330
1331         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1332         if (!cam) {
1333                 mutex_unlock(&sn9c102_sysfs_lock);
1334                 return -ENODEV;
1335         }
1336
1337         bridge = cam->bridge;
1338
1339         mutex_unlock(&sn9c102_sysfs_lock);
1340
1341         value = sn9c102_strtou16(buf, len, &count);
1342         if (!count)
1343                 return -EINVAL;
1344
1345         switch (bridge) {
1346         case BRIDGE_SN9C101:
1347         case BRIDGE_SN9C102:
1348                 if (value > 0x0f)
1349                         return -EINVAL;
1350                 if ((res = sn9c102_store_reg(cd, attr, "0x11", 4)) >= 0)
1351                         res = sn9c102_store_val(cd, attr, buf, len);
1352                 break;
1353         case BRIDGE_SN9C103:
1354         case BRIDGE_SN9C105:
1355         case BRIDGE_SN9C120:
1356                 if (value > 0x7f)
1357                         return -EINVAL;
1358                 if ((res = sn9c102_store_reg(cd, attr, "0x07", 4)) >= 0)
1359                         res = sn9c102_store_val(cd, attr, buf, len);
1360                 break;
1361         }
1362
1363         return res;
1364 }
1365
1366
1367 static ssize_t
1368 sn9c102_store_blue(struct device* cd, struct device_attribute *attr,
1369                    const char* buf, size_t len)
1370 {
1371         ssize_t res = 0;
1372         u16 value;
1373         ssize_t count;
1374
1375         value = sn9c102_strtou16(buf, len, &count);
1376         if (!count || value > 0x7f)
1377                 return -EINVAL;
1378
1379         if ((res = sn9c102_store_reg(cd, attr, "0x06", 4)) >= 0)
1380                 res = sn9c102_store_val(cd, attr, buf, len);
1381
1382         return res;
1383 }
1384
1385
1386 static ssize_t
1387 sn9c102_store_red(struct device* cd, struct device_attribute *attr,
1388                   const char* buf, size_t len)
1389 {
1390         ssize_t res = 0;
1391         u16 value;
1392         ssize_t count;
1393
1394         value = sn9c102_strtou16(buf, len, &count);
1395         if (!count || value > 0x7f)
1396                 return -EINVAL;
1397
1398         if ((res = sn9c102_store_reg(cd, attr, "0x05", 4)) >= 0)
1399                 res = sn9c102_store_val(cd, attr, buf, len);
1400
1401         return res;
1402 }
1403
1404
1405 static ssize_t sn9c102_show_frame_header(struct device* cd,
1406                                          struct device_attribute *attr,
1407                                          char* buf)
1408 {
1409         struct sn9c102_device* cam;
1410         ssize_t count;
1411
1412         cam = video_get_drvdata(container_of(cd, struct video_device, dev));
1413         if (!cam)
1414                 return -ENODEV;
1415
1416         count = sizeof(cam->sysfs.frame_header);
1417         memcpy(buf, cam->sysfs.frame_header, count);
1418
1419         DBG(3, "Frame header, read bytes: %zd", count);
1420
1421         return count;
1422 }
1423
1424
1425 static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR, sn9c102_show_reg, sn9c102_store_reg);
1426 static DEVICE_ATTR(val, S_IRUGO | S_IWUSR, sn9c102_show_val, sn9c102_store_val);
1427 static DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
1428                    sn9c102_show_i2c_reg, sn9c102_store_i2c_reg);
1429 static DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
1430                    sn9c102_show_i2c_val, sn9c102_store_i2c_val);
1431 static DEVICE_ATTR(green, S_IWUSR, NULL, sn9c102_store_green);
1432 static DEVICE_ATTR(blue, S_IWUSR, NULL, sn9c102_store_blue);
1433 static DEVICE_ATTR(red, S_IWUSR, NULL, sn9c102_store_red);
1434 static DEVICE_ATTR(frame_header, S_IRUGO, sn9c102_show_frame_header, NULL);
1435
1436
1437 static int sn9c102_create_sysfs(struct sn9c102_device* cam)
1438 {
1439         struct device *dev = &(cam->v4ldev->dev);
1440         int err = 0;
1441
1442         if ((err = device_create_file(dev, &dev_attr_reg)))
1443                 goto err_out;
1444         if ((err = device_create_file(dev, &dev_attr_val)))
1445                 goto err_reg;
1446         if ((err = device_create_file(dev, &dev_attr_frame_header)))
1447                 goto err_val;
1448
1449         if (cam->sensor.sysfs_ops) {
1450                 if ((err = device_create_file(dev, &dev_attr_i2c_reg)))
1451                         goto err_frame_header;
1452                 if ((err = device_create_file(dev, &dev_attr_i2c_val)))
1453                         goto err_i2c_reg;
1454         }
1455
1456         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
1457                 if ((err = device_create_file(dev, &dev_attr_green)))
1458                         goto err_i2c_val;
1459         } else {
1460                 if ((err = device_create_file(dev, &dev_attr_blue)))
1461                         goto err_i2c_val;
1462                 if ((err = device_create_file(dev, &dev_attr_red)))
1463                         goto err_blue;
1464         }
1465
1466         return 0;
1467
1468 err_blue:
1469         device_remove_file(dev, &dev_attr_blue);
1470 err_i2c_val:
1471         if (cam->sensor.sysfs_ops)
1472                 device_remove_file(dev, &dev_attr_i2c_val);
1473 err_i2c_reg:
1474         if (cam->sensor.sysfs_ops)
1475                 device_remove_file(dev, &dev_attr_i2c_reg);
1476 err_frame_header:
1477         device_remove_file(dev, &dev_attr_frame_header);
1478 err_val:
1479         device_remove_file(dev, &dev_attr_val);
1480 err_reg:
1481         device_remove_file(dev, &dev_attr_reg);
1482 err_out:
1483         return err;
1484 }
1485 #endif /* CONFIG_VIDEO_ADV_DEBUG */
1486
1487 /*****************************************************************************/
1488
1489 static int
1490 sn9c102_set_pix_format(struct sn9c102_device* cam, struct v4l2_pix_format* pix)
1491 {
1492         int err = 0;
1493
1494         if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
1495             pix->pixelformat == V4L2_PIX_FMT_JPEG) {
1496                 switch (cam->bridge) {
1497                 case BRIDGE_SN9C101:
1498                 case BRIDGE_SN9C102:
1499                 case BRIDGE_SN9C103:
1500                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1501                                                  0x18);
1502                         break;
1503                 case BRIDGE_SN9C105:
1504                 case BRIDGE_SN9C120:
1505                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1506                                                  0x18);
1507                         break;
1508                 }
1509         } else {
1510                 switch (cam->bridge) {
1511                 case BRIDGE_SN9C101:
1512                 case BRIDGE_SN9C102:
1513                 case BRIDGE_SN9C103:
1514                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0x7f,
1515                                                  0x18);
1516                         break;
1517                 case BRIDGE_SN9C105:
1518                 case BRIDGE_SN9C120:
1519                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x80,
1520                                                  0x18);
1521                         break;
1522                 }
1523         }
1524
1525         return err ? -EIO : 0;
1526 }
1527
1528
1529 static int
1530 sn9c102_set_compression(struct sn9c102_device* cam,
1531                         struct v4l2_jpegcompression* compression)
1532 {
1533         int i, err = 0;
1534
1535         switch (cam->bridge) {
1536         case BRIDGE_SN9C101:
1537         case BRIDGE_SN9C102:
1538         case BRIDGE_SN9C103:
1539                 if (compression->quality == 0)
1540                         err += sn9c102_write_reg(cam, cam->reg[0x17] | 0x01,
1541                                                  0x17);
1542                 else if (compression->quality == 1)
1543                         err += sn9c102_write_reg(cam, cam->reg[0x17] & 0xfe,
1544                                                  0x17);
1545                 break;
1546         case BRIDGE_SN9C105:
1547         case BRIDGE_SN9C120:
1548                 if (compression->quality == 0) {
1549                         for (i = 0; i <= 63; i++) {
1550                                 err += sn9c102_write_reg(cam,
1551                                                          SN9C102_Y_QTABLE1[i],
1552                                                          0x100 + i);
1553                                 err += sn9c102_write_reg(cam,
1554                                                          SN9C102_UV_QTABLE1[i],
1555                                                          0x140 + i);
1556                         }
1557                         err += sn9c102_write_reg(cam, cam->reg[0x18] & 0xbf,
1558                                                  0x18);
1559                 } else if (compression->quality == 1) {
1560                         for (i = 0; i <= 63; i++) {
1561                                 err += sn9c102_write_reg(cam,
1562                                                          SN9C102_Y_QTABLE1[i],
1563                                                          0x100 + i);
1564                                 err += sn9c102_write_reg(cam,
1565                                                          SN9C102_UV_QTABLE1[i],
1566                                                          0x140 + i);
1567                         }
1568                         err += sn9c102_write_reg(cam, cam->reg[0x18] | 0x40,
1569                                                  0x18);
1570                 }
1571                 break;
1572         }
1573
1574         return err ? -EIO : 0;
1575 }
1576
1577
1578 static int sn9c102_set_scale(struct sn9c102_device* cam, u8 scale)
1579 {
1580         u8 r = 0;
1581         int err = 0;
1582
1583         if (scale == 1)
1584                 r = cam->reg[0x18] & 0xcf;
1585         else if (scale == 2) {
1586                 r = cam->reg[0x18] & 0xcf;
1587                 r |= 0x10;
1588         } else if (scale == 4)
1589                 r = cam->reg[0x18] | 0x20;
1590
1591         err += sn9c102_write_reg(cam, r, 0x18);
1592         if (err)
1593                 return -EIO;
1594
1595         PDBGG("Scaling factor: %u", scale);
1596
1597         return 0;
1598 }
1599
1600
1601 static int sn9c102_set_crop(struct sn9c102_device* cam, struct v4l2_rect* rect)
1602 {
1603         struct sn9c102_sensor* s = &cam->sensor;
1604         u8 h_start = (u8)(rect->left - s->cropcap.bounds.left),
1605            v_start = (u8)(rect->top - s->cropcap.bounds.top),
1606            h_size = (u8)(rect->width / 16),
1607            v_size = (u8)(rect->height / 16);
1608         int err = 0;
1609
1610         err += sn9c102_write_reg(cam, h_start, 0x12);
1611         err += sn9c102_write_reg(cam, v_start, 0x13);
1612         err += sn9c102_write_reg(cam, h_size, 0x15);
1613         err += sn9c102_write_reg(cam, v_size, 0x16);
1614         if (err)
1615                 return -EIO;
1616
1617         PDBGG("h_start, v_start, h_size, v_size, ho_size, vo_size "
1618               "%u %u %u %u", h_start, v_start, h_size, v_size);
1619
1620         return 0;
1621 }
1622
1623
1624 static int sn9c102_init(struct sn9c102_device* cam)
1625 {
1626         struct sn9c102_sensor* s = &cam->sensor;
1627         struct v4l2_control ctrl;
1628         struct v4l2_queryctrl *qctrl;
1629         struct v4l2_rect* rect;
1630         u8 i = 0;
1631         int err = 0;
1632
1633         if (!(cam->state & DEV_INITIALIZED)) {
1634                 mutex_init(&cam->open_mutex);
1635                 init_waitqueue_head(&cam->wait_open);
1636                 qctrl = s->qctrl;
1637                 rect = &(s->cropcap.defrect);
1638         } else { /* use current values */
1639                 qctrl = s->_qctrl;
1640                 rect = &(s->_rect);
1641         }
1642
1643         err += sn9c102_set_scale(cam, rect->width / s->pix_format.width);
1644         err += sn9c102_set_crop(cam, rect);
1645         if (err)
1646                 return err;
1647
1648         if (s->init) {
1649                 err = s->init(cam);
1650                 if (err) {
1651                         DBG(3, "Sensor initialization failed");
1652                         return err;
1653                 }
1654         }
1655
1656         if (!(cam->state & DEV_INITIALIZED))
1657                 if (cam->bridge == BRIDGE_SN9C101 ||
1658                     cam->bridge == BRIDGE_SN9C102 ||
1659                     cam->bridge == BRIDGE_SN9C103) {
1660                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1661                                 s->pix_format.pixelformat= V4L2_PIX_FMT_SBGGR8;
1662                         cam->compression.quality =  cam->reg[0x17] & 0x01 ?
1663                                                     0 : 1;
1664                 } else {
1665                         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X)
1666                                 s->pix_format.pixelformat = V4L2_PIX_FMT_JPEG;
1667                         cam->compression.quality =  cam->reg[0x18] & 0x40 ?
1668                                                     0 : 1;
1669                         err += sn9c102_set_compression(cam, &cam->compression);
1670                 }
1671         else
1672                 err += sn9c102_set_compression(cam, &cam->compression);
1673         err += sn9c102_set_pix_format(cam, &s->pix_format);
1674         if (s->set_pix_format)
1675                 err += s->set_pix_format(cam, &s->pix_format);
1676         if (err)
1677                 return err;
1678
1679         if (s->pix_format.pixelformat == V4L2_PIX_FMT_SN9C10X ||
1680             s->pix_format.pixelformat == V4L2_PIX_FMT_JPEG)
1681                 DBG(3, "Compressed video format is active, quality %d",
1682                     cam->compression.quality);
1683         else
1684                 DBG(3, "Uncompressed video format is active");
1685
1686         if (s->set_crop)
1687                 if ((err = s->set_crop(cam, rect))) {
1688                         DBG(3, "set_crop() failed");
1689                         return err;
1690                 }
1691
1692         if (s->set_ctrl) {
1693                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1694                         if (s->qctrl[i].id != 0 &&
1695                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1696                                 ctrl.id = s->qctrl[i].id;
1697                                 ctrl.value = qctrl[i].default_value;
1698                                 err = s->set_ctrl(cam, &ctrl);
1699                                 if (err) {
1700                                         DBG(3, "Set %s control failed",
1701                                             s->qctrl[i].name);
1702                                         return err;
1703                                 }
1704                                 DBG(3, "Image sensor supports '%s' control",
1705                                     s->qctrl[i].name);
1706                         }
1707         }
1708
1709         if (!(cam->state & DEV_INITIALIZED)) {
1710                 mutex_init(&cam->fileop_mutex);
1711                 spin_lock_init(&cam->queue_lock);
1712                 init_waitqueue_head(&cam->wait_frame);
1713                 init_waitqueue_head(&cam->wait_stream);
1714                 cam->nreadbuffers = 2;
1715                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1716                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1717                        sizeof(struct v4l2_rect));
1718                 cam->state |= DEV_INITIALIZED;
1719         }
1720
1721         DBG(2, "Initialization succeeded");
1722         return 0;
1723 }
1724
1725 /*****************************************************************************/
1726
1727 static void sn9c102_release_resources(struct kref *kref)
1728 {
1729         struct sn9c102_device *cam;
1730
1731         mutex_lock(&sn9c102_sysfs_lock);
1732
1733         cam = container_of(kref, struct sn9c102_device, kref);
1734
1735         DBG(2, "V4L2 device %s deregistered",
1736             video_device_node_name(cam->v4ldev));
1737         video_set_drvdata(cam->v4ldev, NULL);
1738         video_unregister_device(cam->v4ldev);
1739         usb_put_dev(cam->usbdev);
1740         kfree(cam->control_buffer);
1741         kfree(cam);
1742
1743         mutex_unlock(&sn9c102_sysfs_lock);
1744
1745 }
1746
1747
1748 static int sn9c102_open(struct file *filp)
1749 {
1750         struct sn9c102_device* cam;
1751         int err = 0;
1752
1753         /*
1754            A read_trylock() in open() is the only safe way to prevent race
1755            conditions with disconnect(), one close() and multiple (not
1756            necessarily simultaneous) attempts to open(). For example, it
1757            prevents from waiting for a second access, while the device
1758            structure is being deallocated, after a possible disconnect() and
1759            during a following close() holding the write lock: given that, after
1760            this deallocation, no access will be possible anymore, using the
1761            non-trylock version would have let open() gain the access to the
1762            device structure improperly.
1763            For this reason the lock must also not be per-device.
1764         */
1765         if (!down_read_trylock(&sn9c102_dev_lock))
1766                 return -ERESTARTSYS;
1767
1768         cam = video_drvdata(filp);
1769
1770         if (wait_for_completion_interruptible(&cam->probe)) {
1771                 up_read(&sn9c102_dev_lock);
1772                 return -ERESTARTSYS;
1773         }
1774
1775         kref_get(&cam->kref);
1776
1777         /*
1778             Make sure to isolate all the simultaneous opens.
1779         */
1780         if (mutex_lock_interruptible(&cam->open_mutex)) {
1781                 kref_put(&cam->kref, sn9c102_release_resources);
1782                 up_read(&sn9c102_dev_lock);
1783                 return -ERESTARTSYS;
1784         }
1785
1786         if (cam->state & DEV_DISCONNECTED) {
1787                 DBG(1, "Device not present");
1788                 err = -ENODEV;
1789                 goto out;
1790         }
1791
1792         if (cam->users) {
1793                 DBG(2, "Device %s is already in use",
1794                     video_device_node_name(cam->v4ldev));
1795                 DBG(3, "Simultaneous opens are not supported");
1796                 /*
1797                    open() must follow the open flags and should block
1798                    eventually while the device is in use.
1799                 */
1800                 if ((filp->f_flags & O_NONBLOCK) ||
1801                     (filp->f_flags & O_NDELAY)) {
1802                         err = -EWOULDBLOCK;
1803                         goto out;
1804                 }
1805                 DBG(2, "A blocking open() has been requested. Wait for the "
1806                        "device to be released...");
1807                 up_read(&sn9c102_dev_lock);
1808                 /*
1809                    We will not release the "open_mutex" lock, so that only one
1810                    process can be in the wait queue below. This way the process
1811                    will be sleeping while holding the lock, without losing its
1812                    priority after any wake_up().
1813                 */
1814                 err = wait_event_interruptible_exclusive(cam->wait_open,
1815                                                 (cam->state & DEV_DISCONNECTED)
1816                                                          || !cam->users);
1817                 down_read(&sn9c102_dev_lock);
1818                 if (err)
1819                         goto out;
1820                 if (cam->state & DEV_DISCONNECTED) {
1821                         err = -ENODEV;
1822                         goto out;
1823                 }
1824         }
1825
1826         if (cam->state & DEV_MISCONFIGURED) {
1827                 err = sn9c102_init(cam);
1828                 if (err) {
1829                         DBG(1, "Initialization failed again. "
1830                                "I will retry on next open().");
1831                         goto out;
1832                 }
1833                 cam->state &= ~DEV_MISCONFIGURED;
1834         }
1835
1836         if ((err = sn9c102_start_transfer(cam)))
1837                 goto out;
1838
1839         filp->private_data = cam;
1840         cam->users++;
1841         cam->io = IO_NONE;
1842         cam->stream = STREAM_OFF;
1843         cam->nbuffers = 0;
1844         cam->frame_count = 0;
1845         sn9c102_empty_framequeues(cam);
1846
1847         DBG(3, "Video device %s is open", video_device_node_name(cam->v4ldev));
1848
1849 out:
1850         mutex_unlock(&cam->open_mutex);
1851         if (err)
1852                 kref_put(&cam->kref, sn9c102_release_resources);
1853
1854         up_read(&sn9c102_dev_lock);
1855         return err;
1856 }
1857
1858
1859 static int sn9c102_release(struct file *filp)
1860 {
1861         struct sn9c102_device* cam;
1862
1863         down_write(&sn9c102_dev_lock);
1864
1865         cam = video_drvdata(filp);
1866
1867         sn9c102_stop_transfer(cam);
1868         sn9c102_release_buffers(cam);
1869         cam->users--;
1870         wake_up_interruptible_nr(&cam->wait_open, 1);
1871
1872         DBG(3, "Video device %s closed", video_device_node_name(cam->v4ldev));
1873
1874         kref_put(&cam->kref, sn9c102_release_resources);
1875
1876         up_write(&sn9c102_dev_lock);
1877
1878         return 0;
1879 }
1880
1881
1882 static ssize_t
1883 sn9c102_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
1884 {
1885         struct sn9c102_device *cam = video_drvdata(filp);
1886         struct sn9c102_frame_t* f, * i;
1887         unsigned long lock_flags;
1888         long timeout;
1889         int err = 0;
1890
1891         if (mutex_lock_interruptible(&cam->fileop_mutex))
1892                 return -ERESTARTSYS;
1893
1894         if (cam->state & DEV_DISCONNECTED) {
1895                 DBG(1, "Device not present");
1896                 mutex_unlock(&cam->fileop_mutex);
1897                 return -ENODEV;
1898         }
1899
1900         if (cam->state & DEV_MISCONFIGURED) {
1901                 DBG(1, "The camera is misconfigured. Close and open it "
1902                        "again.");
1903                 mutex_unlock(&cam->fileop_mutex);
1904                 return -EIO;
1905         }
1906
1907         if (cam->io == IO_MMAP) {
1908                 DBG(3, "Close and open the device again to choose "
1909                        "the read method");
1910                 mutex_unlock(&cam->fileop_mutex);
1911                 return -EBUSY;
1912         }
1913
1914         if (cam->io == IO_NONE) {
1915                 if (!sn9c102_request_buffers(cam,cam->nreadbuffers, IO_READ)) {
1916                         DBG(1, "read() failed, not enough memory");
1917                         mutex_unlock(&cam->fileop_mutex);
1918                         return -ENOMEM;
1919                 }
1920                 cam->io = IO_READ;
1921                 cam->stream = STREAM_ON;
1922         }
1923
1924         if (list_empty(&cam->inqueue)) {
1925                 if (!list_empty(&cam->outqueue))
1926                         sn9c102_empty_framequeues(cam);
1927                 sn9c102_queue_unusedframes(cam);
1928         }
1929
1930         if (!count) {
1931                 mutex_unlock(&cam->fileop_mutex);
1932                 return 0;
1933         }
1934
1935         if (list_empty(&cam->outqueue)) {
1936                 if (filp->f_flags & O_NONBLOCK) {
1937                         mutex_unlock(&cam->fileop_mutex);
1938                         return -EAGAIN;
1939                 }
1940                 if (!cam->module_param.frame_timeout) {
1941                         err = wait_event_interruptible
1942                               ( cam->wait_frame,
1943                                 (!list_empty(&cam->outqueue)) ||
1944                                 (cam->state & DEV_DISCONNECTED) ||
1945                                 (cam->state & DEV_MISCONFIGURED) );
1946                         if (err) {
1947                                 mutex_unlock(&cam->fileop_mutex);
1948                                 return err;
1949                         }
1950                 } else {
1951                         timeout = wait_event_interruptible_timeout
1952                                   ( cam->wait_frame,
1953                                     (!list_empty(&cam->outqueue)) ||
1954                                     (cam->state & DEV_DISCONNECTED) ||
1955                                     (cam->state & DEV_MISCONFIGURED),
1956                                     msecs_to_jiffies(
1957                                         cam->module_param.frame_timeout * 1000
1958                                     )
1959                                   );
1960                         if (timeout < 0) {
1961                                 mutex_unlock(&cam->fileop_mutex);
1962                                 return timeout;
1963                         } else if (timeout == 0 &&
1964                                    !(cam->state & DEV_DISCONNECTED)) {
1965                                 DBG(1, "Video frame timeout elapsed");
1966                                 mutex_unlock(&cam->fileop_mutex);
1967                                 return -EIO;
1968                         }
1969                 }
1970                 if (cam->state & DEV_DISCONNECTED) {
1971                         mutex_unlock(&cam->fileop_mutex);
1972                         return -ENODEV;
1973                 }
1974                 if (cam->state & DEV_MISCONFIGURED) {
1975                         mutex_unlock(&cam->fileop_mutex);
1976                         return -EIO;
1977                 }
1978         }
1979
1980         f = list_entry(cam->outqueue.prev, struct sn9c102_frame_t, frame);
1981
1982         if (count > f->buf.bytesused)
1983                 count = f->buf.bytesused;
1984
1985         if (copy_to_user(buf, f->bufmem, count)) {
1986                 err = -EFAULT;
1987                 goto exit;
1988         }
1989         *f_pos += count;
1990
1991 exit:
1992         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1993         list_for_each_entry(i, &cam->outqueue, frame)
1994                 i->state = F_UNUSED;
1995         INIT_LIST_HEAD(&cam->outqueue);
1996         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1997
1998         sn9c102_queue_unusedframes(cam);
1999
2000         PDBGG("Frame #%lu, bytes read: %zu",
2001               (unsigned long)f->buf.index, count);
2002
2003         mutex_unlock(&cam->fileop_mutex);
2004
2005         return count;
2006 }
2007
2008
2009 static unsigned int sn9c102_poll(struct file *filp, poll_table *wait)
2010 {
2011         struct sn9c102_device *cam = video_drvdata(filp);
2012         struct sn9c102_frame_t* f;
2013         unsigned long lock_flags;
2014         unsigned int mask = 0;
2015
2016         if (mutex_lock_interruptible(&cam->fileop_mutex))
2017                 return POLLERR;
2018
2019         if (cam->state & DEV_DISCONNECTED) {
2020                 DBG(1, "Device not present");
2021                 goto error;
2022         }
2023
2024         if (cam->state & DEV_MISCONFIGURED) {
2025                 DBG(1, "The camera is misconfigured. Close and open it "
2026                        "again.");
2027                 goto error;
2028         }
2029
2030         if (cam->io == IO_NONE) {
2031                 if (!sn9c102_request_buffers(cam, cam->nreadbuffers,
2032                                              IO_READ)) {
2033                         DBG(1, "poll() failed, not enough memory");
2034                         goto error;
2035                 }
2036                 cam->io = IO_READ;
2037                 cam->stream = STREAM_ON;
2038         }
2039
2040         if (cam->io == IO_READ) {
2041                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
2042                 list_for_each_entry(f, &cam->outqueue, frame)
2043                         f->state = F_UNUSED;
2044                 INIT_LIST_HEAD(&cam->outqueue);
2045                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2046                 sn9c102_queue_unusedframes(cam);
2047         }
2048
2049         poll_wait(filp, &cam->wait_frame, wait);
2050
2051         if (!list_empty(&cam->outqueue))
2052                 mask |= POLLIN | POLLRDNORM;
2053
2054         mutex_unlock(&cam->fileop_mutex);
2055
2056         return mask;
2057
2058 error:
2059         mutex_unlock(&cam->fileop_mutex);
2060         return POLLERR;
2061 }
2062
2063
2064 static void sn9c102_vm_open(struct vm_area_struct* vma)
2065 {
2066         struct sn9c102_frame_t* f = vma->vm_private_data;
2067         f->vma_use_count++;
2068 }
2069
2070
2071 static void sn9c102_vm_close(struct vm_area_struct* vma)
2072 {
2073         /* NOTE: buffers are not freed here */
2074         struct sn9c102_frame_t* f = vma->vm_private_data;
2075         f->vma_use_count--;
2076 }
2077
2078
2079 static const struct vm_operations_struct sn9c102_vm_ops = {
2080         .open = sn9c102_vm_open,
2081         .close = sn9c102_vm_close,
2082 };
2083
2084
2085 static int sn9c102_mmap(struct file* filp, struct vm_area_struct *vma)
2086 {
2087         struct sn9c102_device *cam = video_drvdata(filp);
2088         unsigned long size = vma->vm_end - vma->vm_start,
2089                       start = vma->vm_start;
2090         void *pos;
2091         u32 i;
2092
2093         if (mutex_lock_interruptible(&cam->fileop_mutex))
2094                 return -ERESTARTSYS;
2095
2096         if (cam->state & DEV_DISCONNECTED) {
2097                 DBG(1, "Device not present");
2098                 mutex_unlock(&cam->fileop_mutex);
2099                 return -ENODEV;
2100         }
2101
2102         if (cam->state & DEV_MISCONFIGURED) {
2103                 DBG(1, "The camera is misconfigured. Close and open it "
2104                        "again.");
2105                 mutex_unlock(&cam->fileop_mutex);
2106                 return -EIO;
2107         }
2108
2109         if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
2110                 mutex_unlock(&cam->fileop_mutex);
2111                 return -EACCES;
2112         }
2113
2114         if (cam->io != IO_MMAP ||
2115             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
2116                 mutex_unlock(&cam->fileop_mutex);
2117                 return -EINVAL;
2118         }
2119
2120         for (i = 0; i < cam->nbuffers; i++) {
2121                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
2122                         break;
2123         }
2124         if (i == cam->nbuffers) {
2125                 mutex_unlock(&cam->fileop_mutex);
2126                 return -EINVAL;
2127         }
2128
2129         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
2130
2131         pos = cam->frame[i].bufmem;
2132         while (size > 0) { /* size is page-aligned */
2133                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
2134                         mutex_unlock(&cam->fileop_mutex);
2135                         return -EAGAIN;
2136                 }
2137                 start += PAGE_SIZE;
2138                 pos += PAGE_SIZE;
2139                 size -= PAGE_SIZE;
2140         }
2141
2142         vma->vm_ops = &sn9c102_vm_ops;
2143         vma->vm_private_data = &cam->frame[i];
2144         sn9c102_vm_open(vma);
2145
2146         mutex_unlock(&cam->fileop_mutex);
2147
2148         return 0;
2149 }
2150
2151 /*****************************************************************************/
2152
2153 static int
2154 sn9c102_vidioc_querycap(struct sn9c102_device* cam, void __user * arg)
2155 {
2156         struct v4l2_capability cap = {
2157                 .driver = "sn9c102",
2158                 .version = LINUX_VERSION_CODE,
2159                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
2160                                 V4L2_CAP_STREAMING,
2161         };
2162
2163         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
2164         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
2165                 strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
2166                         sizeof(cap.bus_info));
2167
2168         if (copy_to_user(arg, &cap, sizeof(cap)))
2169                 return -EFAULT;
2170
2171         return 0;
2172 }
2173
2174
2175 static int
2176 sn9c102_vidioc_enuminput(struct sn9c102_device* cam, void __user * arg)
2177 {
2178         struct v4l2_input i;
2179
2180         if (copy_from_user(&i, arg, sizeof(i)))
2181                 return -EFAULT;
2182
2183         if (i.index)
2184                 return -EINVAL;
2185
2186         memset(&i, 0, sizeof(i));
2187         strcpy(i.name, "Camera");
2188         i.type = V4L2_INPUT_TYPE_CAMERA;
2189         i.capabilities = V4L2_IN_CAP_STD;
2190
2191         if (copy_to_user(arg, &i, sizeof(i)))
2192                 return -EFAULT;
2193
2194         return 0;
2195 }
2196
2197
2198 static int
2199 sn9c102_vidioc_g_input(struct sn9c102_device* cam, void __user * arg)
2200 {
2201         int index = 0;
2202
2203         if (copy_to_user(arg, &index, sizeof(index)))
2204                 return -EFAULT;
2205
2206         return 0;
2207 }
2208
2209
2210 static int
2211 sn9c102_vidioc_s_input(struct sn9c102_device* cam, void __user * arg)
2212 {
2213         int index;
2214
2215         if (copy_from_user(&index, arg, sizeof(index)))
2216                 return -EFAULT;
2217
2218         if (index != 0)
2219                 return -EINVAL;
2220
2221         return 0;
2222 }
2223
2224
2225 static int
2226 sn9c102_vidioc_query_ctrl(struct sn9c102_device* cam, void __user * arg)
2227 {
2228         struct sn9c102_sensor* s = &cam->sensor;
2229         struct v4l2_queryctrl qc;
2230         u8 i;
2231
2232         if (copy_from_user(&qc, arg, sizeof(qc)))
2233                 return -EFAULT;
2234
2235         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2236                 if (qc.id && qc.id == s->qctrl[i].id) {
2237                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
2238                         if (copy_to_user(arg, &qc, sizeof(qc)))
2239                                 return -EFAULT;
2240                         return 0;
2241                 }
2242
2243         return -EINVAL;
2244 }
2245
2246
2247 static int
2248 sn9c102_vidioc_g_ctrl(struct sn9c102_device* cam, void __user * arg)
2249 {
2250         struct sn9c102_sensor* s = &cam->sensor;
2251         struct v4l2_control ctrl;
2252         int err = 0;
2253         u8 i;
2254
2255         if (!s->get_ctrl && !s->set_ctrl)
2256                 return -EINVAL;
2257
2258         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2259                 return -EFAULT;
2260
2261         if (!s->get_ctrl) {
2262                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
2263                         if (ctrl.id && ctrl.id == s->qctrl[i].id) {
2264                                 ctrl.value = s->_qctrl[i].default_value;
2265                                 goto exit;
2266                         }
2267                 return -EINVAL;
2268         } else
2269                 err = s->get_ctrl(cam, &ctrl);
2270
2271 exit:
2272         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
2273                 return -EFAULT;
2274
2275         PDBGG("VIDIOC_G_CTRL: id %lu, value %lu",
2276               (unsigned long)ctrl.id, (unsigned long)ctrl.value);
2277
2278         return err;
2279 }
2280
2281
2282 static int
2283 sn9c102_vidioc_s_ctrl(struct sn9c102_device* cam, void __user * arg)
2284 {
2285         struct sn9c102_sensor* s = &cam->sensor;
2286         struct v4l2_control ctrl;
2287         u8 i;
2288         int err = 0;
2289
2290         if (!s->set_ctrl)
2291                 return -EINVAL;
2292
2293         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2294                 return -EFAULT;
2295
2296         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) {
2297                 if (ctrl.id == s->qctrl[i].id) {
2298                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
2299                                 return -EINVAL;
2300                         if (ctrl.value < s->qctrl[i].minimum ||
2301                             ctrl.value > s->qctrl[i].maximum)
2302                                 return -ERANGE;
2303                         ctrl.value -= ctrl.value % s->qctrl[i].step;
2304                         break;
2305                 }
2306         }
2307         if (i == ARRAY_SIZE(s->qctrl))
2308                 return -EINVAL;
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                 break;
2485         case BRIDGE_SN9C105:
2486         case BRIDGE_SN9C120:
2487                 if (frmsize.pixel_format != V4L2_PIX_FMT_JPEG &&
2488                     frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
2489                         return -EINVAL;
2490                 break;
2491         }
2492
2493         frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
2494         frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
2495         frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
2496         frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
2497         frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
2498         memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
2499
2500         if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
2501                 return -EFAULT;
2502
2503         return 0;
2504 }
2505
2506
2507 static int
2508 sn9c102_vidioc_enum_fmt(struct sn9c102_device* cam, void __user * arg)
2509 {
2510         struct v4l2_fmtdesc fmtd;
2511
2512         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
2513                 return -EFAULT;
2514
2515         if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2516                 return -EINVAL;
2517
2518         if (fmtd.index == 0) {
2519                 strcpy(fmtd.description, "bayer rgb");
2520                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
2521         } else if (fmtd.index == 1) {
2522                 switch (cam->bridge) {
2523                 case BRIDGE_SN9C101:
2524                 case BRIDGE_SN9C102:
2525                 case BRIDGE_SN9C103:
2526                         strcpy(fmtd.description, "compressed");
2527                         fmtd.pixelformat = V4L2_PIX_FMT_SN9C10X;
2528                         break;
2529                 case BRIDGE_SN9C105:
2530                 case BRIDGE_SN9C120:
2531                         strcpy(fmtd.description, "JPEG");
2532                         fmtd.pixelformat = V4L2_PIX_FMT_JPEG;
2533                         break;
2534                 }
2535                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
2536         } else
2537                 return -EINVAL;
2538
2539         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2540         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
2541
2542         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
2543                 return -EFAULT;
2544
2545         return 0;
2546 }
2547
2548
2549 static int
2550 sn9c102_vidioc_g_fmt(struct sn9c102_device* cam, void __user * arg)
2551 {
2552         struct v4l2_format format;
2553         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
2554
2555         if (copy_from_user(&format, arg, sizeof(format)))
2556                 return -EFAULT;
2557
2558         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2559                 return -EINVAL;
2560
2561         pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_JPEG) ?
2562                            V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2563         pfmt->bytesperline = (pfmt->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2564                               pfmt->pixelformat == V4L2_PIX_FMT_JPEG)
2565                              ? 0 : (pfmt->width * pfmt->priv) / 8;
2566         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
2567         pfmt->field = V4L2_FIELD_NONE;
2568         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
2569
2570         if (copy_to_user(arg, &format, sizeof(format)))
2571                 return -EFAULT;
2572
2573         return 0;
2574 }
2575
2576
2577 static int
2578 sn9c102_vidioc_try_s_fmt(struct sn9c102_device* cam, unsigned int cmd,
2579                          void __user * arg)
2580 {
2581         struct sn9c102_sensor* s = &cam->sensor;
2582         struct v4l2_format format;
2583         struct v4l2_pix_format* pix;
2584         struct v4l2_pix_format* pfmt = &(s->pix_format);
2585         struct v4l2_rect* bounds = &(s->cropcap.bounds);
2586         struct v4l2_rect rect;
2587         u8 scale;
2588         const enum sn9c102_stream_state stream = cam->stream;
2589         const u32 nbuffers = cam->nbuffers;
2590         u32 i;
2591         int err = 0;
2592
2593         if (copy_from_user(&format, arg, sizeof(format)))
2594                 return -EFAULT;
2595
2596         pix = &(format.fmt.pix);
2597
2598         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2599                 return -EINVAL;
2600
2601         memcpy(&rect, &(s->_rect), sizeof(rect));
2602
2603         { /* calculate the actual scaling factor */
2604                 u32 a, b;
2605                 a = rect.width * rect.height;
2606                 b = pix->width * pix->height;
2607                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2608         }
2609
2610         rect.width = scale * pix->width;
2611         rect.height = scale * pix->height;
2612
2613         if (rect.width < 16)
2614                 rect.width = 16;
2615         if (rect.height < 16)
2616                 rect.height = 16;
2617         if (rect.width > bounds->left + bounds->width - rect.left)
2618                 rect.width = bounds->left + bounds->width - rect.left;
2619         if (rect.height > bounds->top + bounds->height - rect.top)
2620                 rect.height = bounds->top + bounds->height - rect.top;
2621
2622         rect.width &= ~15L;
2623         rect.height &= ~15L;
2624
2625         { /* adjust the scaling factor */
2626                 u32 a, b;
2627                 a = rect.width * rect.height;
2628                 b = pix->width * pix->height;
2629                 scale = b ? (u8)((a / b) < 4 ? 1 : ((a / b) < 16 ? 2 : 4)) : 1;
2630         }
2631
2632         pix->width = rect.width / scale;
2633         pix->height = rect.height / scale;
2634
2635         switch (cam->bridge) {
2636         case BRIDGE_SN9C101:
2637         case BRIDGE_SN9C102:
2638         case BRIDGE_SN9C103:
2639                 if (pix->pixelformat != V4L2_PIX_FMT_SN9C10X &&
2640                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2641                         pix->pixelformat = pfmt->pixelformat;
2642                 break;
2643         case BRIDGE_SN9C105:
2644         case BRIDGE_SN9C120:
2645                 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
2646                     pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2647                         pix->pixelformat = pfmt->pixelformat;
2648                 break;
2649         }
2650         pix->priv = pfmt->priv; /* bpp */
2651         pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_JPEG) ?
2652                           V4L2_COLORSPACE_JPEG : V4L2_COLORSPACE_SRGB;
2653         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_SN9C10X ||
2654                              pix->pixelformat == V4L2_PIX_FMT_JPEG)
2655                             ? 0 : (pix->width * pix->priv) / 8;
2656         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2657         pix->field = V4L2_FIELD_NONE;
2658
2659         if (cmd == VIDIOC_TRY_FMT) {
2660                 if (copy_to_user(arg, &format, sizeof(format)))
2661                         return -EFAULT;
2662                 return 0;
2663         }
2664
2665         if (cam->module_param.force_munmap)
2666                 for (i = 0; i < cam->nbuffers; i++)
2667                         if (cam->frame[i].vma_use_count) {
2668                                 DBG(3, "VIDIOC_S_FMT failed. Unmap the "
2669                                        "buffers first.");
2670                                 return -EBUSY;
2671                         }
2672
2673         if (cam->stream == STREAM_ON)
2674                 if ((err = sn9c102_stream_interrupt(cam)))
2675                         return err;
2676
2677         if (copy_to_user(arg, &format, sizeof(format))) {
2678                 cam->stream = stream;
2679                 return -EFAULT;
2680         }
2681
2682         if (cam->module_param.force_munmap  || cam->io == IO_READ)
2683                 sn9c102_release_buffers(cam);
2684
2685         err += sn9c102_set_pix_format(cam, pix);
2686         err += sn9c102_set_crop(cam, &rect);
2687         if (s->set_pix_format)
2688                 err += s->set_pix_format(cam, pix);
2689         if (s->set_crop)
2690                 err += s->set_crop(cam, &rect);
2691         err += sn9c102_set_scale(cam, scale);
2692
2693         if (err) { /* atomic, no rollback in ioctl() */
2694                 cam->state |= DEV_MISCONFIGURED;
2695                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2696                        "use the camera, close and open %s again.",
2697                     video_device_node_name(cam->v4ldev));
2698                 return -EIO;
2699         }
2700
2701         memcpy(pfmt, pix, sizeof(*pix));
2702         memcpy(&(s->_rect), &rect, sizeof(rect));
2703
2704         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2705             nbuffers != sn9c102_request_buffers(cam, nbuffers, cam->io)) {
2706                 cam->state |= DEV_MISCONFIGURED;
2707                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2708                        "use the camera, close and open %s again.",
2709                     video_device_node_name(cam->v4ldev));
2710                 return -ENOMEM;
2711         }
2712
2713         if (cam->io == IO_READ)
2714                 sn9c102_empty_framequeues(cam);
2715         else if (cam->module_param.force_munmap)
2716                 sn9c102_requeue_outqueue(cam);
2717
2718         cam->stream = stream;
2719
2720         return 0;
2721 }
2722
2723
2724 static int
2725 sn9c102_vidioc_g_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2726 {
2727         if (copy_to_user(arg, &cam->compression, sizeof(cam->compression)))
2728                 return -EFAULT;
2729
2730         return 0;
2731 }
2732
2733
2734 static int
2735 sn9c102_vidioc_s_jpegcomp(struct sn9c102_device* cam, void __user * arg)
2736 {
2737         struct v4l2_jpegcompression jc;
2738         const enum sn9c102_stream_state stream = cam->stream;
2739         int err = 0;
2740
2741         if (copy_from_user(&jc, arg, sizeof(jc)))
2742                 return -EFAULT;
2743
2744         if (jc.quality != 0 && jc.quality != 1)
2745                 return -EINVAL;
2746
2747         if (cam->stream == STREAM_ON)
2748                 if ((err = sn9c102_stream_interrupt(cam)))
2749                         return err;
2750
2751         err += sn9c102_set_compression(cam, &jc);
2752         if (err) { /* atomic, no rollback in ioctl() */
2753                 cam->state |= DEV_MISCONFIGURED;
2754                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware problems. "
2755                        "To use the camera, close and open %s again.",
2756                     video_device_node_name(cam->v4ldev));
2757                 return -EIO;
2758         }
2759
2760         cam->compression.quality = jc.quality;
2761
2762         cam->stream = stream;
2763
2764         return 0;
2765 }
2766
2767
2768 static int
2769 sn9c102_vidioc_reqbufs(struct sn9c102_device* cam, void __user * arg)
2770 {
2771         struct v4l2_requestbuffers rb;
2772         u32 i;
2773         int err;
2774
2775         if (copy_from_user(&rb, arg, sizeof(rb)))
2776                 return -EFAULT;
2777
2778         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2779             rb.memory != V4L2_MEMORY_MMAP)
2780                 return -EINVAL;
2781
2782         if (cam->io == IO_READ) {
2783                 DBG(3, "Close and open the device again to choose the mmap "
2784                        "I/O method");
2785                 return -EBUSY;
2786         }
2787
2788         for (i = 0; i < cam->nbuffers; i++)
2789                 if (cam->frame[i].vma_use_count) {
2790                         DBG(3, "VIDIOC_REQBUFS failed. Previous buffers are "
2791                                "still mapped.");
2792                         return -EBUSY;
2793                 }
2794
2795         if (cam->stream == STREAM_ON)
2796                 if ((err = sn9c102_stream_interrupt(cam)))
2797                         return err;
2798
2799         sn9c102_empty_framequeues(cam);
2800
2801         sn9c102_release_buffers(cam);
2802         if (rb.count)
2803                 rb.count = sn9c102_request_buffers(cam, rb.count, IO_MMAP);
2804
2805         if (copy_to_user(arg, &rb, sizeof(rb))) {
2806                 sn9c102_release_buffers(cam);
2807                 cam->io = IO_NONE;
2808                 return -EFAULT;
2809         }
2810
2811         cam->io = rb.count ? IO_MMAP : IO_NONE;
2812
2813         return 0;
2814 }
2815
2816
2817 static int
2818 sn9c102_vidioc_querybuf(struct sn9c102_device* cam, void __user * arg)
2819 {
2820         struct v4l2_buffer b;
2821
2822         if (copy_from_user(&b, arg, sizeof(b)))
2823                 return -EFAULT;
2824
2825         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2826             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2827                 return -EINVAL;
2828
2829         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2830
2831         if (cam->frame[b.index].vma_use_count)
2832                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2833
2834         if (cam->frame[b.index].state == F_DONE)
2835                 b.flags |= V4L2_BUF_FLAG_DONE;
2836         else if (cam->frame[b.index].state != F_UNUSED)
2837                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2838
2839         if (copy_to_user(arg, &b, sizeof(b)))
2840                 return -EFAULT;
2841
2842         return 0;
2843 }
2844
2845
2846 static int
2847 sn9c102_vidioc_qbuf(struct sn9c102_device* cam, void __user * arg)
2848 {
2849         struct v4l2_buffer b;
2850         unsigned long lock_flags;
2851
2852         if (copy_from_user(&b, arg, sizeof(b)))
2853                 return -EFAULT;
2854
2855         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2856             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2857                 return -EINVAL;
2858
2859         if (cam->frame[b.index].state != F_UNUSED)
2860                 return -EINVAL;
2861
2862         cam->frame[b.index].state = F_QUEUED;
2863
2864         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2865         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2866         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2867
2868         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2869
2870         return 0;
2871 }
2872
2873
2874 static int
2875 sn9c102_vidioc_dqbuf(struct sn9c102_device* cam, struct file* filp,
2876                      void __user * arg)
2877 {
2878         struct v4l2_buffer b;
2879         struct sn9c102_frame_t *f;
2880         unsigned long lock_flags;
2881         long timeout;
2882         int err = 0;
2883
2884         if (copy_from_user(&b, arg, sizeof(b)))
2885                 return -EFAULT;
2886
2887         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2888                 return -EINVAL;
2889
2890         if (list_empty(&cam->outqueue)) {
2891                 if (cam->stream == STREAM_OFF)
2892                         return -EINVAL;
2893                 if (filp->f_flags & O_NONBLOCK)
2894                         return -EAGAIN;
2895                 if (!cam->module_param.frame_timeout) {
2896                         err = wait_event_interruptible
2897                               ( cam->wait_frame,
2898                                 (!list_empty(&cam->outqueue)) ||
2899                                 (cam->state & DEV_DISCONNECTED) ||
2900                                 (cam->state & DEV_MISCONFIGURED) );
2901                         if (err)
2902                                 return err;
2903                 } else {
2904                         timeout = wait_event_interruptible_timeout
2905                                   ( cam->wait_frame,
2906                                     (!list_empty(&cam->outqueue)) ||
2907                                     (cam->state & DEV_DISCONNECTED) ||
2908                                     (cam->state & DEV_MISCONFIGURED),
2909                                     cam->module_param.frame_timeout *
2910                                     1000 * msecs_to_jiffies(1) );
2911                         if (timeout < 0)
2912                                 return timeout;
2913                         else if (timeout == 0 &&
2914                                  !(cam->state & DEV_DISCONNECTED)) {
2915                                 DBG(1, "Video frame timeout elapsed");
2916                                 return -EIO;
2917                         }
2918                 }
2919                 if (cam->state & DEV_DISCONNECTED)
2920                         return -ENODEV;
2921                 if (cam->state & DEV_MISCONFIGURED)
2922                         return -EIO;
2923         }
2924
2925         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2926         f = list_entry(cam->outqueue.next, struct sn9c102_frame_t, frame);
2927         list_del(cam->outqueue.next);
2928         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2929
2930         f->state = F_UNUSED;
2931
2932         memcpy(&b, &f->buf, sizeof(b));
2933         if (f->vma_use_count)
2934                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2935
2936         if (copy_to_user(arg, &b, sizeof(b)))
2937                 return -EFAULT;
2938
2939         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2940
2941         return 0;
2942 }
2943
2944
2945 static int
2946 sn9c102_vidioc_streamon(struct sn9c102_device* cam, void __user * arg)
2947 {
2948         int type;
2949
2950         if (copy_from_user(&type, arg, sizeof(type)))
2951                 return -EFAULT;
2952
2953         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2954                 return -EINVAL;
2955
2956         cam->stream = STREAM_ON;
2957
2958         DBG(3, "Stream on");
2959
2960         return 0;
2961 }
2962
2963
2964 static int
2965 sn9c102_vidioc_streamoff(struct sn9c102_device* cam, void __user * arg)
2966 {
2967         int type, err;
2968
2969         if (copy_from_user(&type, arg, sizeof(type)))
2970                 return -EFAULT;
2971
2972         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2973                 return -EINVAL;
2974
2975         if (cam->stream == STREAM_ON)
2976                 if ((err = sn9c102_stream_interrupt(cam)))
2977                         return err;
2978
2979         sn9c102_empty_framequeues(cam);
2980
2981         DBG(3, "Stream off");
2982
2983         return 0;
2984 }
2985
2986
2987 static int
2988 sn9c102_vidioc_g_parm(struct sn9c102_device* cam, void __user * arg)
2989 {
2990         struct v4l2_streamparm sp;
2991
2992         if (copy_from_user(&sp, arg, sizeof(sp)))
2993                 return -EFAULT;
2994
2995         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2996                 return -EINVAL;
2997
2998         sp.parm.capture.extendedmode = 0;
2999         sp.parm.capture.readbuffers = cam->nreadbuffers;
3000
3001         if (copy_to_user(arg, &sp, sizeof(sp)))
3002                 return -EFAULT;
3003
3004         return 0;
3005 }
3006
3007
3008 static int
3009 sn9c102_vidioc_s_parm(struct sn9c102_device* cam, void __user * arg)
3010 {
3011         struct v4l2_streamparm sp;
3012
3013         if (copy_from_user(&sp, arg, sizeof(sp)))
3014                 return -EFAULT;
3015
3016         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
3017                 return -EINVAL;
3018
3019         sp.parm.capture.extendedmode = 0;
3020
3021         if (sp.parm.capture.readbuffers == 0)
3022                 sp.parm.capture.readbuffers = cam->nreadbuffers;
3023
3024         if (sp.parm.capture.readbuffers > SN9C102_MAX_FRAMES)
3025                 sp.parm.capture.readbuffers = SN9C102_MAX_FRAMES;
3026
3027         if (copy_to_user(arg, &sp, sizeof(sp)))
3028                 return -EFAULT;
3029
3030         cam->nreadbuffers = sp.parm.capture.readbuffers;
3031
3032         return 0;
3033 }
3034
3035
3036 static int
3037 sn9c102_vidioc_enumaudio(struct sn9c102_device* cam, void __user * arg)
3038 {
3039         struct v4l2_audio audio;
3040
3041         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3042                 return -EINVAL;
3043
3044         if (copy_from_user(&audio, arg, sizeof(audio)))
3045                 return -EFAULT;
3046
3047         if (audio.index != 0)
3048                 return -EINVAL;
3049
3050         strcpy(audio.name, "Microphone");
3051         audio.capability = 0;
3052         audio.mode = 0;
3053
3054         if (copy_to_user(arg, &audio, sizeof(audio)))
3055                 return -EFAULT;
3056
3057         return 0;
3058 }
3059
3060
3061 static int
3062 sn9c102_vidioc_g_audio(struct sn9c102_device* cam, void __user * arg)
3063 {
3064         struct v4l2_audio audio;
3065
3066         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3067                 return -EINVAL;
3068
3069         if (copy_from_user(&audio, arg, sizeof(audio)))
3070                 return -EFAULT;
3071
3072         memset(&audio, 0, sizeof(audio));
3073         strcpy(audio.name, "Microphone");
3074
3075         if (copy_to_user(arg, &audio, sizeof(audio)))
3076                 return -EFAULT;
3077
3078         return 0;
3079 }
3080
3081
3082 static int
3083 sn9c102_vidioc_s_audio(struct sn9c102_device* cam, void __user * arg)
3084 {
3085         struct v4l2_audio audio;
3086
3087         if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
3088                 return -EINVAL;
3089
3090         if (copy_from_user(&audio, arg, sizeof(audio)))
3091                 return -EFAULT;
3092
3093         if (audio.index != 0)
3094                 return -EINVAL;
3095
3096         return 0;
3097 }
3098
3099
3100 static long sn9c102_ioctl_v4l2(struct file *filp,
3101                               unsigned int cmd, void __user *arg)
3102 {
3103         struct sn9c102_device *cam = video_drvdata(filp);
3104
3105         switch (cmd) {
3106
3107         case VIDIOC_QUERYCAP:
3108                 return sn9c102_vidioc_querycap(cam, arg);
3109
3110         case VIDIOC_ENUMINPUT:
3111                 return sn9c102_vidioc_enuminput(cam, arg);
3112
3113         case VIDIOC_G_INPUT:
3114                 return sn9c102_vidioc_g_input(cam, arg);
3115
3116         case VIDIOC_S_INPUT:
3117                 return sn9c102_vidioc_s_input(cam, arg);
3118
3119         case VIDIOC_QUERYCTRL:
3120                 return sn9c102_vidioc_query_ctrl(cam, arg);
3121
3122         case VIDIOC_G_CTRL:
3123                 return sn9c102_vidioc_g_ctrl(cam, arg);
3124
3125         case VIDIOC_S_CTRL:
3126                 return sn9c102_vidioc_s_ctrl(cam, arg);
3127
3128         case VIDIOC_CROPCAP:
3129                 return sn9c102_vidioc_cropcap(cam, arg);
3130
3131         case VIDIOC_G_CROP:
3132                 return sn9c102_vidioc_g_crop(cam, arg);
3133
3134         case VIDIOC_S_CROP:
3135                 return sn9c102_vidioc_s_crop(cam, arg);
3136
3137         case VIDIOC_ENUM_FRAMESIZES:
3138                 return sn9c102_vidioc_enum_framesizes(cam, arg);
3139
3140         case VIDIOC_ENUM_FMT:
3141                 return sn9c102_vidioc_enum_fmt(cam, arg);
3142
3143         case VIDIOC_G_FMT:
3144                 return sn9c102_vidioc_g_fmt(cam, arg);
3145
3146         case VIDIOC_TRY_FMT:
3147         case VIDIOC_S_FMT:
3148                 return sn9c102_vidioc_try_s_fmt(cam, cmd, arg);
3149
3150         case VIDIOC_G_JPEGCOMP:
3151                 return sn9c102_vidioc_g_jpegcomp(cam, arg);
3152
3153         case VIDIOC_S_JPEGCOMP:
3154                 return sn9c102_vidioc_s_jpegcomp(cam, arg);
3155
3156         case VIDIOC_REQBUFS:
3157                 return sn9c102_vidioc_reqbufs(cam, arg);
3158
3159         case VIDIOC_QUERYBUF:
3160                 return sn9c102_vidioc_querybuf(cam, arg);
3161
3162         case VIDIOC_QBUF:
3163                 return sn9c102_vidioc_qbuf(cam, arg);
3164
3165         case VIDIOC_DQBUF:
3166                 return sn9c102_vidioc_dqbuf(cam, filp, arg);
3167
3168         case VIDIOC_STREAMON:
3169                 return sn9c102_vidioc_streamon(cam, arg);
3170
3171         case VIDIOC_STREAMOFF:
3172                 return sn9c102_vidioc_streamoff(cam, arg);
3173
3174         case VIDIOC_G_PARM:
3175                 return sn9c102_vidioc_g_parm(cam, arg);
3176
3177         case VIDIOC_S_PARM:
3178                 return sn9c102_vidioc_s_parm(cam, arg);
3179
3180         case VIDIOC_ENUMAUDIO:
3181                 return sn9c102_vidioc_enumaudio(cam, arg);
3182
3183         case VIDIOC_G_AUDIO:
3184                 return sn9c102_vidioc_g_audio(cam, arg);
3185
3186         case VIDIOC_S_AUDIO:
3187                 return sn9c102_vidioc_s_audio(cam, arg);
3188
3189         default:
3190                 return -ENOTTY;
3191
3192         }
3193 }
3194
3195
3196 static long sn9c102_ioctl(struct file *filp,
3197                          unsigned int cmd, unsigned long arg)
3198 {
3199         struct sn9c102_device *cam = video_drvdata(filp);
3200         int err = 0;
3201
3202         if (mutex_lock_interruptible(&cam->fileop_mutex))
3203                 return -ERESTARTSYS;
3204
3205         if (cam->state & DEV_DISCONNECTED) {
3206                 DBG(1, "Device not present");
3207                 mutex_unlock(&cam->fileop_mutex);
3208                 return -ENODEV;
3209         }
3210
3211         if (cam->state & DEV_MISCONFIGURED) {
3212                 DBG(1, "The camera is misconfigured. Close and open it "
3213                        "again.");
3214                 mutex_unlock(&cam->fileop_mutex);
3215                 return -EIO;
3216         }
3217
3218         V4LDBG(3, "sn9c102", cmd);
3219
3220         err = sn9c102_ioctl_v4l2(filp, cmd, (void __user *)arg);
3221
3222         mutex_unlock(&cam->fileop_mutex);
3223
3224         return err;
3225 }
3226
3227 /*****************************************************************************/
3228
3229 static const struct v4l2_file_operations sn9c102_fops = {
3230         .owner = THIS_MODULE,
3231         .open = sn9c102_open,
3232         .release = sn9c102_release,
3233         .unlocked_ioctl = sn9c102_ioctl,
3234         .read = sn9c102_read,
3235         .poll = sn9c102_poll,
3236         .mmap = sn9c102_mmap,
3237 };
3238
3239 /*****************************************************************************/
3240
3241 /* It exists a single interface only. We do not need to validate anything. */
3242 static int
3243 sn9c102_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
3244 {
3245         struct usb_device *udev = interface_to_usbdev(intf);
3246         struct sn9c102_device* cam;
3247         static unsigned int dev_nr;
3248         unsigned int i;
3249         int err = 0, r;
3250
3251         if (!(cam = kzalloc(sizeof(struct sn9c102_device), GFP_KERNEL)))
3252                 return -ENOMEM;
3253
3254         cam->usbdev = udev;
3255
3256         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
3257                 DBG(1, "kzalloc() failed");
3258                 err = -ENOMEM;
3259                 goto fail;
3260         }
3261
3262         if (!(cam->v4ldev = video_device_alloc())) {
3263                 DBG(1, "video_device_alloc() failed");
3264                 err = -ENOMEM;
3265                 goto fail;
3266         }
3267
3268         r = sn9c102_read_reg(cam, 0x00);
3269         if (r < 0 || (r != 0x10 && r != 0x11 && r != 0x12)) {
3270                 DBG(1, "Sorry, this is not a SN9C1xx-based camera "
3271                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3272                 err = -ENODEV;
3273                 goto fail;
3274         }
3275
3276         cam->bridge = id->driver_info;
3277         switch (cam->bridge) {
3278         case BRIDGE_SN9C101:
3279         case BRIDGE_SN9C102:
3280                 DBG(2, "SN9C10[12] PC Camera Controller detected "
3281                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3282                 break;
3283         case BRIDGE_SN9C103:
3284                 DBG(2, "SN9C103 PC Camera Controller detected "
3285                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3286                 break;
3287         case BRIDGE_SN9C105:
3288                 DBG(2, "SN9C105 PC Camera Controller detected "
3289                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3290                 break;
3291         case BRIDGE_SN9C120:
3292                 DBG(2, "SN9C120 PC Camera Controller detected "
3293                        "(vid:pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
3294                 break;
3295         }
3296
3297         for  (i = 0; i < ARRAY_SIZE(sn9c102_sensor_table); i++) {
3298                 err = sn9c102_sensor_table[i](cam);
3299                 if (!err)
3300                         break;
3301         }
3302
3303         if (!err) {
3304                 DBG(2, "%s image sensor detected", cam->sensor.name);
3305                 DBG(3, "Support for %s maintained by %s",
3306                     cam->sensor.name, cam->sensor.maintainer);
3307         } else {
3308                 DBG(1, "No supported image sensor detected for this bridge");
3309                 err = -ENODEV;
3310                 goto fail;
3311         }
3312
3313         if (!(cam->bridge & cam->sensor.supported_bridge)) {
3314                 DBG(1, "Bridge not supported");
3315                 err = -ENODEV;
3316                 goto fail;
3317         }
3318
3319         if (sn9c102_init(cam)) {
3320                 DBG(1, "Initialization failed. I will retry on open().");
3321                 cam->state |= DEV_MISCONFIGURED;
3322         }
3323
3324         strcpy(cam->v4ldev->name, "SN9C1xx PC Camera");
3325         cam->v4ldev->fops = &sn9c102_fops;
3326         cam->v4ldev->release = video_device_release;
3327         cam->v4ldev->parent = &udev->dev;
3328
3329         init_completion(&cam->probe);
3330
3331         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
3332                                     video_nr[dev_nr]);
3333         if (err) {
3334                 DBG(1, "V4L2 device registration failed");
3335                 if (err == -ENFILE && video_nr[dev_nr] == -1)
3336                         DBG(1, "Free /dev/videoX node not found");
3337                 video_nr[dev_nr] = -1;
3338                 dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3339                 complete_all(&cam->probe);
3340                 goto fail;
3341         }
3342
3343         DBG(2, "V4L2 device registered as %s",
3344             video_device_node_name(cam->v4ldev));
3345
3346         video_set_drvdata(cam->v4ldev, cam);
3347         cam->module_param.force_munmap = force_munmap[dev_nr];
3348         cam->module_param.frame_timeout = frame_timeout[dev_nr];
3349
3350         dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
3351
3352 #ifdef CONFIG_VIDEO_ADV_DEBUG
3353         err = sn9c102_create_sysfs(cam);
3354         if (!err)
3355                 DBG(2, "Optional device control through 'sysfs' "
3356                        "interface ready");
3357         else
3358                 DBG(2, "Failed to create optional 'sysfs' interface for "
3359                        "device controlling. Error #%d", err);
3360 #else
3361         DBG(2, "Optional device control through 'sysfs' interface disabled");
3362         DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
3363                "configuration option to enable it.");
3364 #endif
3365
3366         usb_set_intfdata(intf, cam);
3367         kref_init(&cam->kref);
3368         usb_get_dev(cam->usbdev);
3369
3370         complete_all(&cam->probe);
3371
3372         return 0;
3373
3374 fail:
3375         if (cam) {
3376                 kfree(cam->control_buffer);
3377                 if (cam->v4ldev)
3378                         video_device_release(cam->v4ldev);
3379                 kfree(cam);
3380         }
3381         return err;
3382 }
3383
3384
3385 static void sn9c102_usb_disconnect(struct usb_interface* intf)
3386 {
3387         struct sn9c102_device* cam;
3388
3389         down_write(&sn9c102_dev_lock);
3390
3391         cam = usb_get_intfdata(intf);
3392
3393         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
3394
3395         if (cam->users) {
3396                 DBG(2, "Device %s is open! Deregistration and memory "
3397                        "deallocation are deferred.",
3398                     video_device_node_name(cam->v4ldev));
3399                 cam->state |= DEV_MISCONFIGURED;
3400                 sn9c102_stop_transfer(cam);
3401                 cam->state |= DEV_DISCONNECTED;
3402                 wake_up_interruptible(&cam->wait_frame);
3403                 wake_up(&cam->wait_stream);
3404         } else
3405                 cam->state |= DEV_DISCONNECTED;
3406
3407         wake_up_interruptible_all(&cam->wait_open);
3408
3409         kref_put(&cam->kref, sn9c102_release_resources);
3410
3411         up_write(&sn9c102_dev_lock);
3412 }
3413
3414
3415 static struct usb_driver sn9c102_usb_driver = {
3416         .name =       "sn9c102",
3417         .id_table =   sn9c102_id_table,
3418         .probe =      sn9c102_usb_probe,
3419         .disconnect = sn9c102_usb_disconnect,
3420 };
3421
3422 module_usb_driver(sn9c102_usb_driver);