git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/et61x251/et61x251_core.c

   1 /***************************************************************************
   2  * V4L2 driver for ET61X[12]51 PC Camera Controllers                       *
   3  *                                                                         *
   4  * Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it>       *
   5  *                                                                         *
   6  * This program is free software; you can redistribute it and/or modify    *
   7  * it under the terms of the GNU General Public License as published by    *
   8  * the Free Software Foundation; either version 2 of the License, or       *
   9  * (at your option) any later version.                                     *
  10  *                                                                         *
  11  * This program is distributed in the hope that it will be useful,         *
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  14  * GNU General Public License for more details.                            *
  15  *                                                                         *
  16  * You should have received a copy of the GNU General Public License       *
  17  * along with this program; if not, write to the Free Software             *
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  19  ***************************************************************************/
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/param.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/errno.h>
  27 #include <linux/slab.h>
  28 #include <linux/device.h>
  29 #include <linux/fs.h>
  30 #include <linux/delay.h>
  31 #include <linux/compiler.h>
  32 #include <linux/ioctl.h>
  33 #include <linux/poll.h>
  34 #include <linux/stat.h>
  35 #include <linux/mm.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/page-flags.h>
  38 #include <linux/byteorder/generic.h>
  39 #include <asm/page.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "et61x251.h"
  43
  44 /*****************************************************************************/
  45
  46 #define ET61X251_MODULE_NAME    "V4L2 driver for ET61X[12]51 "                \
  47                                 "PC Camera Controllers"
  48 #define ET61X251_MODULE_AUTHOR  "(C) 2006 Luca Risolia"
  49 #define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  50 #define ET61X251_MODULE_LICENSE "GPL"
  51 #define ET61X251_MODULE_VERSION "1:1.02"
  52 #define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 2)
  53
  54 /*****************************************************************************/
  55
  56 MODULE_DEVICE_TABLE(usb, et61x251_id_table);
  57
  58 MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
  59 MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
  60 MODULE_VERSION(ET61X251_MODULE_VERSION);
  61 MODULE_LICENSE(ET61X251_MODULE_LICENSE);
  62
  63 static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
  64 module_param_array(video_nr, short, NULL, 0444);
  65 MODULE_PARM_DESC(video_nr,
  66                  "\n<-1|n[,...]> Specify V4L2 minor mode number."
  67                  "\n -1 = use next available (default)"
  68                  "\n  n = use minor number n (integer >= 0)"
  69                  "\nYou can specify up to "
  70                  __MODULE_STRING(ET61X251_MAX_DEVICES) " cameras this way."
  71                  "\nFor example:"
  72                  "\nvideo_nr=-1,2,-1 would assign minor number 2 to"
  73                  "\nthe second registered camera and use auto for the first"
  74                  "\none and for every other camera."
  75                  "\n");
  76
  77 static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  78                                ET61X251_FORCE_MUNMAP};
  79 module_param_array(force_munmap, bool, NULL, 0444);
  80 MODULE_PARM_DESC(force_munmap,
  81                  "\n<0|1[,...]> Force the application to unmap previously"
  82                  "\nmapped buffer memory before calling any VIDIOC_S_CROP or"
  83                  "\nVIDIOC_S_FMT ioctl's. Not all the applications support"
  84                  "\nthis feature. This parameter is specific for each"
  85                  "\ndetected camera."
  86                  "\n 0 = do not force memory unmapping"
  87                  "\n 1 = force memory unmapping (save memory)"
  88                  "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"."
  89                  "\n");
  90
  91 static unsigned int frame_timeout[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  92                                        ET61X251_FRAME_TIMEOUT};
  93 module_param_array(frame_timeout, uint, NULL, 0644);
  94 MODULE_PARM_DESC(frame_timeout,
  95                  "\n<n[,...]> Timeout for a video frame in seconds."
  96                  "\nThis parameter is specific for each detected camera."
  97                  "\nDefault value is "
  98                  __MODULE_STRING(ET61X251_FRAME_TIMEOUT)"."
  99                  "\n");
 100
 101 #ifdef ET61X251_DEBUG
 102 static unsigned short debug = ET61X251_DEBUG_LEVEL;
 103 module_param(debug, ushort, 0644);
 104 MODULE_PARM_DESC(debug,
 105                  "\n<n> Debugging information level, from 0 to 3:"
 106                  "\n0 = none (use carefully)"
 107                  "\n1 = critical errors"
 108                  "\n2 = significant informations"
 109                  "\n3 = more verbose messages"
 110                  "\nLevel 3 is useful for testing only, when only "
 111                  "one device is used."
 112                  "\nDefault value is "__MODULE_STRING(ET61X251_DEBUG_LEVEL)"."
 113                  "\n");
 114 #endif
 115
 116 /*****************************************************************************/
 117
 118 static u32
 119 et61x251_request_buffers(struct et61x251_device* cam, u32 count,
 120                          enum et61x251_io_method io)
 121 {
 122         struct v4l2_pix_format* p = &(cam->sensor.pix_format);
 123         struct v4l2_rect* r = &(cam->sensor.cropcap.bounds);
 124         const size_t imagesize = cam->module_param.force_munmap ||
 125                                  io == IO_READ ?
 126                                  (p->width * p->height * p->priv) / 8 :
 127                                  (r->width * r->height * p->priv) / 8;
 128         void* buff = NULL;
 129         u32 i;
 130
 131         if (count > ET61X251_MAX_FRAMES)
 132                 count = ET61X251_MAX_FRAMES;
 133
 134         cam->nbuffers = count;
 135         while (cam->nbuffers > 0) {
 136                 if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize))))
 137                         break;
 138                 cam->nbuffers--;
 139         }
 140
 141         for (i = 0; i < cam->nbuffers; i++) {
 142                 cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 143                 cam->frame[i].buf.index = i;
 144                 cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 145                 cam->frame[i].buf.length = imagesize;
 146                 cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 147                 cam->frame[i].buf.sequence = 0;
 148                 cam->frame[i].buf.field = V4L2_FIELD_NONE;
 149                 cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 150                 cam->frame[i].buf.flags = 0;
 151         }
 152
 153         return cam->nbuffers;
 154 }
 155
 156
 157 static void et61x251_release_buffers(struct et61x251_device* cam)
 158 {
 159         if (cam->nbuffers) {
 160                 vfree(cam->frame[0].bufmem);
 161                 cam->nbuffers = 0;
 162         }
 163         cam->frame_current = NULL;
 164 }
 165
 166
 167 static void et61x251_empty_framequeues(struct et61x251_device* cam)
 168 {
 169         u32 i;
 170
 171         INIT_LIST_HEAD(&cam->inqueue);
 172         INIT_LIST_HEAD(&cam->outqueue);
 173
 174         for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
 175                 cam->frame[i].state = F_UNUSED;
 176                 cam->frame[i].buf.bytesused = 0;
 177         }
 178 }
 179
 180
 181 static void et61x251_requeue_outqueue(struct et61x251_device* cam)
 182 {
 183         struct et61x251_frame_t *i;
 184
 185         list_for_each_entry(i, &cam->outqueue, frame) {
 186                 i->state = F_QUEUED;
 187                 list_add(&i->frame, &cam->inqueue);
 188         }
 189
 190         INIT_LIST_HEAD(&cam->outqueue);
 191 }
 192
 193
 194 static void et61x251_queue_unusedframes(struct et61x251_device* cam)
 195 {
 196         unsigned long lock_flags;
 197         u32 i;
 198
 199         for (i = 0; i < cam->nbuffers; i++)
 200                 if (cam->frame[i].state == F_UNUSED) {
 201                         cam->frame[i].state = F_QUEUED;
 202                         spin_lock_irqsave(&cam->queue_lock, lock_flags);
 203                         list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 204                         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 205                 }
 206 }
 207
 208 /*****************************************************************************/
 209
 210 int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
 211 {
 212         struct usb_device* udev = cam->usbdev;
 213         u8* buff = cam->control_buffer;
 214         int res;
 215
 216         *buff = value;
 217
 218         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 219                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 220         if (res < 0) {
 221                 DBG(3, "Failed to write a register (value 0x%02X, index "
 222                        "0x%02X, error %d)", value, index, res);
 223                 return -1;
 224         }
 225
 226         return 0;
 227 }
 228
 229
 230 int et61x251_read_reg(struct et61x251_device* cam, u16 index)
 231 {
 232         struct usb_device* udev = cam->usbdev;
 233         u8* buff = cam->control_buffer;
 234         int res;
 235
 236         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 237                               0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 238         if (res < 0)
 239                 DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 240                     index, res);
 241
 242         return (res >= 0) ? (int)(*buff) : -1;
 243 }
 244
 245
 246 static int
 247 et61x251_i2c_wait(struct et61x251_device* cam, struct et61x251_sensor* sensor)
 248 {
 249         int i, r;
 250
 251         for (i = 1; i <= 8; i++) {
 252                 if (sensor->interface == ET61X251_I2C_3WIRES) {
 253                         r = et61x251_read_reg(cam, 0x8e);
 254                         if (!(r & 0x02) && (r >= 0))
 255                                 return 0;
 256                 } else {
 257                         r = et61x251_read_reg(cam, 0x8b);
 258                         if (!(r & 0x01) && (r >= 0))
 259                                 return 0;
 260                 }
 261                 if (r < 0)
 262                         return -EIO;
 263                 udelay(8*8); /* minimum for sensors at 400kHz */
 264         }
 265
 266         return -EBUSY;
 267 }
 268
 269
 270 int
 271 et61x251_i2c_try_read(struct et61x251_device* cam,
 272                       struct et61x251_sensor* sensor, u8 address)
 273 {
 274         struct usb_device* udev = cam->usbdev;
 275         u8* data = cam->control_buffer;
 276         int err = 0, res;
 277
 278         data[0] = address;
 279         data[1] = cam->sensor.i2c_slave_id;
 280         data[2] = cam->sensor.rsta | 0x10;
 281         data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
 282         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 283                               0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
 284         if (res < 0)
 285                 err += res;
 286
 287         err += et61x251_i2c_wait(cam, sensor);
 288
 289         res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 290                               0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
 291         if (res < 0)
 292                 err += res;
 293
 294         if (err)
 295                 DBG(3, "I2C read failed for %s image sensor", sensor->name);
 296
 297         PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
 298
 299         return err ? -1 : (int)data[0];
 300 }
 301
 302
 303 int
 304 et61x251_i2c_try_write(struct et61x251_device* cam,
 305                        struct et61x251_sensor* sensor, u8 address, u8 value)
 306 {
 307         struct usb_device* udev = cam->usbdev;
 308         u8* data = cam->control_buffer;
 309         int err = 0, res;
 310
 311         data[0] = address;
 312         data[1] = cam->sensor.i2c_slave_id;
 313         data[2] = cam->sensor.rsta | 0x12;
 314         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 315                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 316         if (res < 0)
 317                 err += res;
 318
 319         data[0] = value;
 320         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 321                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 322         if (res < 0)
 323                 err += res;
 324
 325         err += et61x251_i2c_wait(cam, sensor);
 326
 327         if (err)
 328                 DBG(3, "I2C write failed for %s image sensor", sensor->name);
 329
 330         PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
 331
 332         return err ? -1 : 0;
 333 }
 334
 335
 336 int
 337 et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
 338                        u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
 339                        u8 data8, u8 address)
 340 {
 341         struct usb_device* udev = cam->usbdev;
 342         u8* data = cam->control_buffer;
 343         int err = 0, res;
 344
 345         data[0] = data2;
 346         data[1] = data3;
 347         data[2] = data4;
 348         data[3] = data5;
 349         data[4] = data6;
 350         data[5] = data7;
 351         data[6] = data8;
 352         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 353                               0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
 354         if (res < 0)
 355                 err += res;
 356
 357         data[0] = address;
 358         data[1] = cam->sensor.i2c_slave_id;
 359         data[2] = cam->sensor.rsta | 0x02 | (n << 4);
 360         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 361                               0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 362         if (res < 0)
 363                 err += res;
 364
 365         /* Start writing through the serial interface */
 366         data[0] = data1;
 367         res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 368                               0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 369         if (res < 0)
 370                 err += res;
 371
 372         err += et61x251_i2c_wait(cam, &cam->sensor);
 373
 374         if (err)
 375                 DBG(3, "I2C raw write failed for %s image sensor",
 376                     cam->sensor.name);
 377
 378         PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
 379               "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
 380               " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
 381               data1, data2, data3, data4, data5, data6, data7, data8);
 382
 383         return err ? -1 : 0;
 384
 385 }
 386
 387
 388 int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
 389 {
 390         return et61x251_i2c_try_read(cam, &cam->sensor, address);
 391 }
 392
 393
 394 int et61x251_i2c_write(struct et61x251_device* cam, u8 address, u8 value)
 395 {
 396         return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
 397 }
 398
 399 /*****************************************************************************/
 400
 401 static void et61x251_urb_complete(struct urb *urb, struct pt_regs* regs)
 402 {
 403         struct et61x251_device* cam = urb->context;
 404         struct et61x251_frame_t** f;
 405         size_t imagesize;
 406         u8 i;
 407         int err = 0;
 408
 409         if (urb->status == -ENOENT)
 410                 return;
 411
 412         f = &cam->frame_current;
 413
 414         if (cam->stream == STREAM_INTERRUPT) {
 415                 cam->stream = STREAM_OFF;
 416                 if ((*f))
 417                         (*f)->state = F_QUEUED;
 418                 DBG(3, "Stream interrupted");
 419                 wake_up(&cam->wait_stream);
 420         }
 421
 422         if (cam->state & DEV_DISCONNECTED)
 423                 return;
 424
 425         if (cam->state & DEV_MISCONFIGURED) {
 426                 wake_up_interruptible(&cam->wait_frame);
 427                 return;
 428         }
 429
 430         if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 431                 goto resubmit_urb;
 432
 433         if (!(*f))
 434                 (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
 435                                   frame);
 436
 437         imagesize = (cam->sensor.pix_format.width *
 438                      cam->sensor.pix_format.height *
 439                      cam->sensor.pix_format.priv) / 8;
 440
 441         for (i = 0; i < urb->number_of_packets; i++) {
 442                 unsigned int len, status;
 443                 void *pos;
 444                 u8* b1, * b2, sof;
 445                 const u8 VOID_BYTES = 6;
 446                 size_t imglen;
 447
 448                 len = urb->iso_frame_desc[i].actual_length;
 449                 status = urb->iso_frame_desc[i].status;
 450                 pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 451
 452                 if (status) {
 453                         DBG(3, "Error in isochronous frame");
 454                         (*f)->state = F_ERROR;
 455                         continue;
 456                 }
 457
 458                 b1 = pos++;
 459                 b2 = pos++;
 460                 sof = ((*b1 & 0x3f) == 63);
 461                 imglen = ((*b1 & 0xc0) << 2) | *b2;
 462
 463                 PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
 464                       len, i, imglen);
 465
 466                 if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 467 start_of_frame:
 468                         if (sof) {
 469                                 (*f)->state = F_GRABBING;
 470                                 (*f)->buf.bytesused = 0;
 471                                 do_gettimeofday(&(*f)->buf.timestamp);
 472                                 pos += 22;
 473                                 DBG(3, "SOF detected: new video frame");
 474                         }
 475
 476                 if ((*f)->state == F_GRABBING) {
 477                         if (sof && (*f)->buf.bytesused) {
 478                                 if (cam->sensor.pix_format.pixelformat ==
 479                                                          V4L2_PIX_FMT_ET61X251)
 480                                         goto end_of_frame;
 481                                 else {
 482                                         DBG(3, "Not expected SOF detected "
 483                                                "after %lu bytes",
 484                                            (unsigned long)(*f)->buf.bytesused);
 485                                         (*f)->state = F_ERROR;
 486                                         continue;
 487                                 }
 488                         }
 489
 490                         if ((*f)->buf.bytesused + imglen > imagesize) {
 491                                 DBG(3, "Video frame size exceeded");
 492                                 (*f)->state = F_ERROR;
 493                                 continue;
 494                         }
 495
 496                         pos += VOID_BYTES;
 497
 498                         memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
 499                         (*f)->buf.bytesused += imglen;
 500
 501                         if ((*f)->buf.bytesused == imagesize) {
 502                                 u32 b;
 503 end_of_frame:
 504                                 b = (*f)->buf.bytesused;
 505                                 (*f)->state = F_DONE;
 506                                 (*f)->buf.sequence= ++cam->frame_count;
 507                                 spin_lock(&cam->queue_lock);
 508                                 list_move_tail(&(*f)->frame, &cam->outqueue);
 509                                 if (!list_empty(&cam->inqueue))
 510                                         (*f) = list_entry(cam->inqueue.next,
 511                                                        struct et61x251_frame_t,
 512                                                           frame);
 513                                 else
 514                                         (*f) = NULL;
 515                                 spin_unlock(&cam->queue_lock);
 516                                 DBG(3, "Video frame captured: : %lu bytes",
 517                                        (unsigned long)(b));
 518
 519                                 if (!(*f))
 520                                         goto resubmit_urb;
 521
 522                                 if (sof &&
 523                                     cam->sensor.pix_format.pixelformat ==
 524                                                          V4L2_PIX_FMT_ET61X251)
 525                                         goto start_of_frame;
 526                         }
 527                 }
 528         }
 529
 530 resubmit_urb:
 531         urb->dev = cam->usbdev;
 532         err = usb_submit_urb(urb, GFP_ATOMIC);
 533         if (err < 0 && err != -EPERM) {
 534                 cam->state |= DEV_MISCONFIGURED;
 535                 DBG(1, "usb_submit_urb() failed");
 536         }
 537
 538         wake_up_interruptible(&cam->wait_frame);
 539 }
 540
 541
 542 static int et61x251_start_transfer(struct et61x251_device* cam)
 543 {
 544         struct usb_device *udev = cam->usbdev;
 545         struct urb* urb;
 546         const unsigned int wMaxPacketSize[] = {0, 256, 384, 512, 640, 768, 832,
 547                                                864, 896, 920, 956, 980, 1000,
 548                                                1022};
 549         const unsigned int psz = wMaxPacketSize[ET61X251_ALTERNATE_SETTING];
 550         s8 i, j;
 551         int err = 0;
 552
 553         for (i = 0; i < ET61X251_URBS; i++) {
 554                 cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
 555                                                   GFP_KERNEL);
 556                 if (!cam->transfer_buffer[i]) {
 557                         err = -ENOMEM;
 558                         DBG(1, "Not enough memory");
 559                         goto free_buffers;
 560                 }
 561         }
 562
 563         for (i = 0; i < ET61X251_URBS; i++) {
 564                 urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
 565                 cam->urb[i] = urb;
 566                 if (!urb) {
 567                         err = -ENOMEM;
 568                         DBG(1, "usb_alloc_urb() failed");
 569                         goto free_urbs;
 570                 }
 571                 urb->dev = udev;
 572                 urb->context = cam;
 573                 urb->pipe = usb_rcvisocpipe(udev, 1);
 574                 urb->transfer_flags = URB_ISO_ASAP;
 575                 urb->number_of_packets = ET61X251_ISO_PACKETS;
 576                 urb->complete = et61x251_urb_complete;
 577                 urb->transfer_buffer = cam->transfer_buffer[i];
 578                 urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
 579                 urb->interval = 1;
 580                 for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
 581                         urb->iso_frame_desc[j].offset = psz * j;
 582                         urb->iso_frame_desc[j].length = psz;
 583                 }
 584         }
 585
 586         err = et61x251_write_reg(cam, 0x01, 0x03);
 587         err = et61x251_write_reg(cam, 0x00, 0x03);
 588         err = et61x251_write_reg(cam, 0x08, 0x03);
 589         if (err) {
 590                 err = -EIO;
 591                 DBG(1, "I/O hardware error");
 592                 goto free_urbs;
 593         }
 594
 595         err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
 596         if (err) {
 597                 DBG(1, "usb_set_interface() failed");
 598                 goto free_urbs;
 599         }
 600
 601         cam->frame_current = NULL;
 602
 603         for (i = 0; i < ET61X251_URBS; i++) {
 604                 err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 605                 if (err) {
 606                         for (j = i-1; j >= 0; j--)
 607                                 usb_kill_urb(cam->urb[j]);
 608                         DBG(1, "usb_submit_urb() failed, error %d", err);
 609                         goto free_urbs;
 610                 }
 611         }
 612
 613         return 0;
 614
 615 free_urbs:
 616         for (i = 0; (i < ET61X251_URBS) &&  cam->urb[i]; i++)
 617                 usb_free_urb(cam->urb[i]);
 618
 619 free_buffers:
 620         for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
 621                 kfree(cam->transfer_buffer[i]);
 622
 623         return err;
 624 }
 625
 626
 627 static int et61x251_stop_transfer(struct et61x251_device* cam)
 628 {
 629         struct usb_device *udev = cam->usbdev;
 630         s8 i;
 631         int err = 0;
 632
 633         if (cam->state & DEV_DISCONNECTED)
 634                 return 0;
 635
 636         for (i = ET61X251_URBS-1; i >= 0; i--) {
 637                 usb_kill_urb(cam->urb[i]);
 638                 usb_free_urb(cam->urb[i]);
 639                 kfree(cam->transfer_buffer[i]);
 640         }
 641
 642         err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 643         if (err)
 644                 DBG(3, "usb_set_interface() failed");
 645
 646         return err;
 647 }
 648
 649
 650 static int et61x251_stream_interrupt(struct et61x251_device* cam)
 651 {
 652         long timeout;
 653
 654         cam->stream = STREAM_INTERRUPT;
 655         timeout = wait_event_timeout(cam->wait_stream,
 656                                      (cam->stream == STREAM_OFF) ||
 657                                      (cam->state & DEV_DISCONNECTED),
 658                                      ET61X251_URB_TIMEOUT);
 659         if (cam->state & DEV_DISCONNECTED)
 660                 return -ENODEV;
 661         else if (cam->stream != STREAM_OFF) {
 662                 cam->state |= DEV_MISCONFIGURED;
 663                 DBG(1, "URB timeout reached. The camera is misconfigured. To "
 664                        "use it, close and open /dev/video%d again.",
 665                     cam->v4ldev->minor);
 666                 return -EIO;
 667         }
 668
 669         return 0;
 670 }
 671
 672 /*****************************************************************************/
 673
 674 #ifdef CONFIG_VIDEO_ADV_DEBUG
 675 static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
 676 {
 677         char str[5];
 678         char* endp;
 679         unsigned long val;
 680
 681         if (len < 4) {
 682                 strncpy(str, buff, len);
 683                 str[len+1] = '\0';
 684         } else {
 685                 strncpy(str, buff, 4);
 686                 str[4] = '\0';
 687         }
 688
 689         val = simple_strtoul(str, &endp, 0);
 690
 691         *count = 0;
 692         if (val <= 0xff)
 693                 *count = (ssize_t)(endp - str);
 694         if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 695                 *count += 1;
 696
 697         return (u8)val;
 698 }
 699
 700 /*
 701    NOTE 1: being inside one of the following methods implies that the v4l
 702            device exists for sure (see kobjects and reference counters)
 703    NOTE 2: buffers are PAGE_SIZE long
 704 */
 705
 706 static ssize_t et61x251_show_reg(struct class_device* cd, char* buf)
 707 {
 708         struct et61x251_device* cam;
 709         ssize_t count;
 710
 711         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 712                 return -ERESTARTSYS;
 713
 714         cam = video_get_drvdata(to_video_device(cd));
 715         if (!cam) {
 716                 mutex_unlock(&et61x251_sysfs_lock);
 717                 return -ENODEV;
 718         }
 719
 720         count = sprintf(buf, "%u\n", cam->sysfs.reg);
 721
 722         mutex_unlock(&et61x251_sysfs_lock);
 723
 724         return count;
 725 }
 726
 727
 728 static ssize_t
 729 et61x251_store_reg(struct class_device* cd, const char* buf, size_t len)
 730 {
 731         struct et61x251_device* cam;
 732         u8 index;
 733         ssize_t count;
 734
 735         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 736                 return -ERESTARTSYS;
 737
 738         cam = video_get_drvdata(to_video_device(cd));
 739         if (!cam) {
 740                 mutex_unlock(&et61x251_sysfs_lock);
 741                 return -ENODEV;
 742         }
 743
 744         index = et61x251_strtou8(buf, len, &count);
 745         if (index > 0x8e || !count) {
 746                 mutex_unlock(&et61x251_sysfs_lock);
 747                 return -EINVAL;
 748         }
 749
 750         cam->sysfs.reg = index;
 751
 752         DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
 753         DBG(3, "Written bytes: %zd", count);
 754
 755         mutex_unlock(&et61x251_sysfs_lock);
 756
 757         return count;
 758 }
 759
 760
 761 static ssize_t et61x251_show_val(struct class_device* cd, char* buf)
 762 {
 763         struct et61x251_device* cam;
 764         ssize_t count;
 765         int val;
 766
 767         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 768                 return -ERESTARTSYS;
 769
 770         cam = video_get_drvdata(to_video_device(cd));
 771         if (!cam) {
 772                 mutex_unlock(&et61x251_sysfs_lock);
 773                 return -ENODEV;
 774         }
 775
 776         if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
 777                 mutex_unlock(&et61x251_sysfs_lock);
 778                 return -EIO;
 779         }
 780
 781         count = sprintf(buf, "%d\n", val);
 782
 783         DBG(3, "Read bytes: %zd", count);
 784
 785         mutex_unlock(&et61x251_sysfs_lock);
 786
 787         return count;
 788 }
 789
 790
 791 static ssize_t
 792 et61x251_store_val(struct class_device* cd, const char* buf, size_t len)
 793 {
 794         struct et61x251_device* cam;
 795         u8 value;
 796         ssize_t count;
 797         int err;
 798
 799         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 800                 return -ERESTARTSYS;
 801
 802         cam = video_get_drvdata(to_video_device(cd));
 803         if (!cam) {
 804                 mutex_unlock(&et61x251_sysfs_lock);
 805                 return -ENODEV;
 806         }
 807
 808         value = et61x251_strtou8(buf, len, &count);
 809         if (!count) {
 810                 mutex_unlock(&et61x251_sysfs_lock);
 811                 return -EINVAL;
 812         }
 813
 814         err = et61x251_write_reg(cam, value, cam->sysfs.reg);
 815         if (err) {
 816                 mutex_unlock(&et61x251_sysfs_lock);
 817                 return -EIO;
 818         }
 819
 820         DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
 821             cam->sysfs.reg, value);
 822         DBG(3, "Written bytes: %zd", count);
 823
 824         mutex_unlock(&et61x251_sysfs_lock);
 825
 826         return count;
 827 }
 828
 829
 830 static ssize_t et61x251_show_i2c_reg(struct class_device* cd, char* buf)
 831 {
 832         struct et61x251_device* cam;
 833         ssize_t count;
 834
 835         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 836                 return -ERESTARTSYS;
 837
 838         cam = video_get_drvdata(to_video_device(cd));
 839         if (!cam) {
 840                 mutex_unlock(&et61x251_sysfs_lock);
 841                 return -ENODEV;
 842         }
 843
 844         count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
 845
 846         DBG(3, "Read bytes: %zd", count);
 847
 848         mutex_unlock(&et61x251_sysfs_lock);
 849
 850         return count;
 851 }
 852
 853
 854 static ssize_t
 855 et61x251_store_i2c_reg(struct class_device* cd, const char* buf, size_t len)
 856 {
 857         struct et61x251_device* cam;
 858         u8 index;
 859         ssize_t count;
 860
 861         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 862                 return -ERESTARTSYS;
 863
 864         cam = video_get_drvdata(to_video_device(cd));
 865         if (!cam) {
 866                 mutex_unlock(&et61x251_sysfs_lock);
 867                 return -ENODEV;
 868         }
 869
 870         index = et61x251_strtou8(buf, len, &count);
 871         if (!count) {
 872                 mutex_unlock(&et61x251_sysfs_lock);
 873                 return -EINVAL;
 874         }
 875
 876         cam->sysfs.i2c_reg = index;
 877
 878         DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
 879         DBG(3, "Written bytes: %zd", count);
 880
 881         mutex_unlock(&et61x251_sysfs_lock);
 882
 883         return count;
 884 }
 885
 886
 887 static ssize_t et61x251_show_i2c_val(struct class_device* cd, char* buf)
 888 {
 889         struct et61x251_device* cam;
 890         ssize_t count;
 891         int val;
 892
 893         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 894                 return -ERESTARTSYS;
 895
 896         cam = video_get_drvdata(to_video_device(cd));
 897         if (!cam) {
 898                 mutex_unlock(&et61x251_sysfs_lock);
 899                 return -ENODEV;
 900         }
 901
 902         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 903                 mutex_unlock(&et61x251_sysfs_lock);
 904                 return -ENOSYS;
 905         }
 906
 907         if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
 908                 mutex_unlock(&et61x251_sysfs_lock);
 909                 return -EIO;
 910         }
 911
 912         count = sprintf(buf, "%d\n", val);
 913
 914         DBG(3, "Read bytes: %zd", count);
 915
 916         mutex_unlock(&et61x251_sysfs_lock);
 917
 918         return count;
 919 }
 920
 921
 922 static ssize_t
 923 et61x251_store_i2c_val(struct class_device* cd, const char* buf, size_t len)
 924 {
 925         struct et61x251_device* cam;
 926         u8 value;
 927         ssize_t count;
 928         int err;
 929
 930         if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 931                 return -ERESTARTSYS;
 932
 933         cam = video_get_drvdata(to_video_device(cd));
 934         if (!cam) {
 935                 mutex_unlock(&et61x251_sysfs_lock);
 936                 return -ENODEV;
 937         }
 938
 939         if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 940                 mutex_unlock(&et61x251_sysfs_lock);
 941                 return -ENOSYS;
 942         }
 943
 944         value = et61x251_strtou8(buf, len, &count);
 945         if (!count) {
 946                 mutex_unlock(&et61x251_sysfs_lock);
 947                 return -EINVAL;
 948         }
 949
 950         err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
 951         if (err) {
 952                 mutex_unlock(&et61x251_sysfs_lock);
 953                 return -EIO;
 954         }
 955
 956         DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
 957             cam->sysfs.i2c_reg, value);
 958         DBG(3, "Written bytes: %zd", count);
 959
 960         mutex_unlock(&et61x251_sysfs_lock);
 961
 962         return count;
 963 }
 964
 965
 966 static CLASS_DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
 967                          et61x251_show_reg, et61x251_store_reg);
 968 static CLASS_DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
 969                          et61x251_show_val, et61x251_store_val);
 970 static CLASS_DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
 971                          et61x251_show_i2c_reg, et61x251_store_i2c_reg);
 972 static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
 973                          et61x251_show_i2c_val, et61x251_store_i2c_val);
 974
 975
 976 static void et61x251_create_sysfs(struct et61x251_device* cam)
 977 {
 978         struct video_device *v4ldev = cam->v4ldev;
 979
 980         video_device_create_file(v4ldev, &class_device_attr_reg);
 981         video_device_create_file(v4ldev, &class_device_attr_val);
 982         if (cam->sensor.sysfs_ops) {
 983                 video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
 984                 video_device_create_file(v4ldev, &class_device_attr_i2c_val);
 985         }
 986 }
 987 #endif /* CONFIG_VIDEO_ADV_DEBUG */
 988
 989 /*****************************************************************************/
 990
 991 static int
 992 et61x251_set_pix_format(struct et61x251_device* cam,
 993                         struct v4l2_pix_format* pix)
 994 {
 995         int r, err = 0;
 996
 997         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
 998                 err += r;
 999         if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1000                 err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1001         else
1002                 err += et61x251_write_reg(cam, r | 0x02, 0x12);
1003
1004         return err ? -EIO : 0;
1005 }
1006
1007
1008 static int
1009 et61x251_set_compression(struct et61x251_device* cam,
1010                          struct v4l2_jpegcompression* compression)
1011 {
1012         int r, err = 0;
1013
1014         if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1015                 err += r;
1016         if (compression->quality == 0)
1017                 err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1018         else
1019                 err += et61x251_write_reg(cam, r | 0x04, 0x12);
1020
1021         return err ? -EIO : 0;
1022 }
1023
1024
1025 static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1026 {
1027         int r = 0, err = 0;
1028
1029         r = et61x251_read_reg(cam, 0x12);
1030         if (r < 0)
1031                 err += r;
1032
1033         if (scale == 1)
1034                 err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1035         else if (scale == 2)
1036                 err += et61x251_write_reg(cam, r | 0x01, 0x12);
1037
1038         if (err)
1039                 return -EIO;
1040
1041         PDBGG("Scaling factor: %u", scale);
1042
1043         return 0;
1044 }
1045
1046
1047 static int
1048 et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1049 {
1050         struct et61x251_sensor* s = &cam->sensor;
1051         u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1052                            s->active_pixel.left),
1053             fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1054                            s->active_pixel.top),
1055             fmw_length = (u16)(rect->width),
1056             fmw_height = (u16)(rect->height);
1057         int err = 0;
1058
1059         err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1060         err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1061         err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1062         err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1063         err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1064                                        | ((fmw_length & 0x300) >> 4)
1065                                        | ((fmw_height & 0x300) >> 2), 0x6d);
1066         if (err)
1067                 return -EIO;
1068
1069         PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1070               fmw_sx, fmw_sy, fmw_length, fmw_height);
1071
1072         return 0;
1073 }
1074
1075
1076 static int et61x251_init(struct et61x251_device* cam)
1077 {
1078         struct et61x251_sensor* s = &cam->sensor;
1079         struct v4l2_control ctrl;
1080         struct v4l2_queryctrl *qctrl;
1081         struct v4l2_rect* rect;
1082         u8 i = 0;
1083         int err = 0;
1084
1085         if (!(cam->state & DEV_INITIALIZED)) {
1086                 init_waitqueue_head(&cam->open);
1087                 qctrl = s->qctrl;
1088                 rect = &(s->cropcap.defrect);
1089                 cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1090         } else { /* use current values */
1091                 qctrl = s->_qctrl;
1092                 rect = &(s->_rect);
1093         }
1094
1095         err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1096         err += et61x251_set_crop(cam, rect);
1097         if (err)
1098                 return err;
1099
1100         if (s->init) {
1101                 err = s->init(cam);
1102                 if (err) {
1103                         DBG(3, "Sensor initialization failed");
1104                         return err;
1105                 }
1106         }
1107
1108         err += et61x251_set_compression(cam, &cam->compression);
1109         err += et61x251_set_pix_format(cam, &s->pix_format);
1110         if (s->set_pix_format)
1111                 err += s->set_pix_format(cam, &s->pix_format);
1112         if (err)
1113                 return err;
1114
1115         if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1116                 DBG(3, "Compressed video format is active, quality %d",
1117                     cam->compression.quality);
1118         else
1119                 DBG(3, "Uncompressed video format is active");
1120
1121         if (s->set_crop)
1122                 if ((err = s->set_crop(cam, rect))) {
1123                         DBG(3, "set_crop() failed");
1124                         return err;
1125                 }
1126
1127         if (s->set_ctrl) {
1128                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1129                         if (s->qctrl[i].id != 0 &&
1130                             !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1131                                 ctrl.id = s->qctrl[i].id;
1132                                 ctrl.value = qctrl[i].default_value;
1133                                 err = s->set_ctrl(cam, &ctrl);
1134                                 if (err) {
1135                                         DBG(3, "Set %s control failed",
1136                                             s->qctrl[i].name);
1137                                         return err;
1138                                 }
1139                                 DBG(3, "Image sensor supports '%s' control",
1140                                     s->qctrl[i].name);
1141                         }
1142         }
1143
1144         if (!(cam->state & DEV_INITIALIZED)) {
1145                 mutex_init(&cam->fileop_mutex);
1146                 spin_lock_init(&cam->queue_lock);
1147                 init_waitqueue_head(&cam->wait_frame);
1148                 init_waitqueue_head(&cam->wait_stream);
1149                 cam->nreadbuffers = 2;
1150                 memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1151                 memcpy(&(s->_rect), &(s->cropcap.defrect),
1152                        sizeof(struct v4l2_rect));
1153                 cam->state |= DEV_INITIALIZED;
1154         }
1155
1156         DBG(2, "Initialization succeeded");
1157         return 0;
1158 }
1159
1160
1161 static void et61x251_release_resources(struct et61x251_device* cam)
1162 {
1163         mutex_lock(&et61x251_sysfs_lock);
1164
1165         DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
1166         video_set_drvdata(cam->v4ldev, NULL);
1167         video_unregister_device(cam->v4ldev);
1168
1169         usb_put_dev(cam->usbdev);
1170
1171         mutex_unlock(&et61x251_sysfs_lock);
1172
1173         kfree(cam->control_buffer);
1174 }
1175
1176 /*****************************************************************************/
1177
1178 static int et61x251_open(struct inode* inode, struct file* filp)
1179 {
1180         struct et61x251_device* cam;
1181         int err = 0;
1182
1183         /*
1184            This is the only safe way to prevent race conditions with
1185            disconnect
1186         */
1187         if (!down_read_trylock(&et61x251_disconnect))
1188                 return -ERESTARTSYS;
1189
1190         cam = video_get_drvdata(video_devdata(filp));
1191
1192         if (mutex_lock_interruptible(&cam->dev_mutex)) {
1193                 up_read(&et61x251_disconnect);
1194                 return -ERESTARTSYS;
1195         }
1196
1197         if (cam->users) {
1198                 DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
1199                 if ((filp->f_flags & O_NONBLOCK) ||
1200                     (filp->f_flags & O_NDELAY)) {
1201                         err = -EWOULDBLOCK;
1202                         goto out;
1203                 }
1204                 mutex_unlock(&cam->dev_mutex);
1205                 err = wait_event_interruptible_exclusive(cam->open,
1206                                                   cam->state & DEV_DISCONNECTED
1207                                                          || !cam->users);
1208                 if (err) {
1209                         up_read(&et61x251_disconnect);
1210                         return err;
1211                 }
1212                 if (cam->state & DEV_DISCONNECTED) {
1213                         up_read(&et61x251_disconnect);
1214                         return -ENODEV;
1215                 }
1216                 mutex_lock(&cam->dev_mutex);
1217         }
1218
1219
1220         if (cam->state & DEV_MISCONFIGURED) {
1221                 err = et61x251_init(cam);
1222                 if (err) {
1223                         DBG(1, "Initialization failed again. "
1224                                "I will retry on next open().");
1225                         goto out;
1226                 }
1227                 cam->state &= ~DEV_MISCONFIGURED;
1228         }
1229
1230         if ((err = et61x251_start_transfer(cam)))
1231                 goto out;
1232
1233         filp->private_data = cam;
1234         cam->users++;
1235         cam->io = IO_NONE;
1236         cam->stream = STREAM_OFF;
1237         cam->nbuffers = 0;
1238         cam->frame_count = 0;
1239         et61x251_empty_framequeues(cam);
1240
1241         DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
1242
1243 out:
1244         mutex_unlock(&cam->dev_mutex);
1245         up_read(&et61x251_disconnect);
1246         return err;
1247 }
1248
1249
1250 static int et61x251_release(struct inode* inode, struct file* filp)
1251 {
1252         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1253
1254         mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
1255
1256         et61x251_stop_transfer(cam);
1257
1258         et61x251_release_buffers(cam);
1259
1260         if (cam->state & DEV_DISCONNECTED) {
1261                 et61x251_release_resources(cam);
1262                 mutex_unlock(&cam->dev_mutex);
1263                 kfree(cam);
1264                 return 0;
1265         }
1266
1267         cam->users--;
1268         wake_up_interruptible_nr(&cam->open, 1);
1269
1270         DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
1271
1272         mutex_unlock(&cam->dev_mutex);
1273
1274         return 0;
1275 }
1276
1277
1278 static ssize_t
1279 et61x251_read(struct file* filp, char __user * buf,
1280               size_t count, loff_t* f_pos)
1281 {
1282         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1283         struct et61x251_frame_t* f, * i;
1284         unsigned long lock_flags;
1285         long timeout;
1286         int err = 0;
1287
1288         if (mutex_lock_interruptible(&cam->fileop_mutex))
1289                 return -ERESTARTSYS;
1290
1291         if (cam->state & DEV_DISCONNECTED) {
1292                 DBG(1, "Device not present");
1293                 mutex_unlock(&cam->fileop_mutex);
1294                 return -ENODEV;
1295         }
1296
1297         if (cam->state & DEV_MISCONFIGURED) {
1298                 DBG(1, "The camera is misconfigured. Close and open it "
1299                        "again.");
1300                 mutex_unlock(&cam->fileop_mutex);
1301                 return -EIO;
1302         }
1303
1304         if (cam->io == IO_MMAP) {
1305                 DBG(3, "Close and open the device again to choose the read "
1306                        "method");
1307                 mutex_unlock(&cam->fileop_mutex);
1308                 return -EINVAL;
1309         }
1310
1311         if (cam->io == IO_NONE) {
1312                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1313                                               IO_READ)) {
1314                         DBG(1, "read() failed, not enough memory");
1315                         mutex_unlock(&cam->fileop_mutex);
1316                         return -ENOMEM;
1317                 }
1318                 cam->io = IO_READ;
1319                 cam->stream = STREAM_ON;
1320         }
1321
1322         if (list_empty(&cam->inqueue)) {
1323                 if (!list_empty(&cam->outqueue))
1324                         et61x251_empty_framequeues(cam);
1325                 et61x251_queue_unusedframes(cam);
1326         }
1327
1328         if (!count) {
1329                 mutex_unlock(&cam->fileop_mutex);
1330                 return 0;
1331         }
1332
1333         if (list_empty(&cam->outqueue)) {
1334                 if (filp->f_flags & O_NONBLOCK) {
1335                         mutex_unlock(&cam->fileop_mutex);
1336                         return -EAGAIN;
1337                 }
1338                 timeout = wait_event_interruptible_timeout
1339                           ( cam->wait_frame,
1340                             (!list_empty(&cam->outqueue)) ||
1341                             (cam->state & DEV_DISCONNECTED) ||
1342                             (cam->state & DEV_MISCONFIGURED),
1343                             cam->module_param.frame_timeout *
1344                             1000 * msecs_to_jiffies(1) );
1345                 if (timeout < 0) {
1346                         mutex_unlock(&cam->fileop_mutex);
1347                         return timeout;
1348                 }
1349                 if (cam->state & DEV_DISCONNECTED) {
1350                         mutex_unlock(&cam->fileop_mutex);
1351                         return -ENODEV;
1352                 }
1353                 if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1354                         mutex_unlock(&cam->fileop_mutex);
1355                         return -EIO;
1356                 }
1357         }
1358
1359         f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1360
1361         if (count > f->buf.bytesused)
1362                 count = f->buf.bytesused;
1363
1364         if (copy_to_user(buf, f->bufmem, count)) {
1365                 err = -EFAULT;
1366                 goto exit;
1367         }
1368         *f_pos += count;
1369
1370 exit:
1371         spin_lock_irqsave(&cam->queue_lock, lock_flags);
1372         list_for_each_entry(i, &cam->outqueue, frame)
1373                 i->state = F_UNUSED;
1374         INIT_LIST_HEAD(&cam->outqueue);
1375         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1376
1377         et61x251_queue_unusedframes(cam);
1378
1379         PDBGG("Frame #%lu, bytes read: %zu",
1380               (unsigned long)f->buf.index, count);
1381
1382         mutex_unlock(&cam->fileop_mutex);
1383
1384         return err ? err : count;
1385 }
1386
1387
1388 static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1389 {
1390         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1391         struct et61x251_frame_t* f;
1392         unsigned long lock_flags;
1393         unsigned int mask = 0;
1394
1395         if (mutex_lock_interruptible(&cam->fileop_mutex))
1396                 return POLLERR;
1397
1398         if (cam->state & DEV_DISCONNECTED) {
1399                 DBG(1, "Device not present");
1400                 goto error;
1401         }
1402
1403         if (cam->state & DEV_MISCONFIGURED) {
1404                 DBG(1, "The camera is misconfigured. Close and open it "
1405                        "again.");
1406                 goto error;
1407         }
1408
1409         if (cam->io == IO_NONE) {
1410                 if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1411                                               IO_READ)) {
1412                         DBG(1, "poll() failed, not enough memory");
1413                         goto error;
1414                 }
1415                 cam->io = IO_READ;
1416                 cam->stream = STREAM_ON;
1417         }
1418
1419         if (cam->io == IO_READ) {
1420                 spin_lock_irqsave(&cam->queue_lock, lock_flags);
1421                 list_for_each_entry(f, &cam->outqueue, frame)
1422                         f->state = F_UNUSED;
1423                 INIT_LIST_HEAD(&cam->outqueue);
1424                 spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1425                 et61x251_queue_unusedframes(cam);
1426         }
1427
1428         poll_wait(filp, &cam->wait_frame, wait);
1429
1430         if (!list_empty(&cam->outqueue))
1431                 mask |= POLLIN | POLLRDNORM;
1432
1433         mutex_unlock(&cam->fileop_mutex);
1434
1435         return mask;
1436
1437 error:
1438         mutex_unlock(&cam->fileop_mutex);
1439         return POLLERR;
1440 }
1441
1442
1443 static void et61x251_vm_open(struct vm_area_struct* vma)
1444 {
1445         struct et61x251_frame_t* f = vma->vm_private_data;
1446         f->vma_use_count++;
1447 }
1448
1449
1450 static void et61x251_vm_close(struct vm_area_struct* vma)
1451 {
1452         /* NOTE: buffers are not freed here */
1453         struct et61x251_frame_t* f = vma->vm_private_data;
1454         f->vma_use_count--;
1455 }
1456
1457
1458 static struct vm_operations_struct et61x251_vm_ops = {
1459         .open = et61x251_vm_open,
1460         .close = et61x251_vm_close,
1461 };
1462
1463
1464 static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1465 {
1466         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
1467         unsigned long size = vma->vm_end - vma->vm_start,
1468                       start = vma->vm_start;
1469         void *pos;
1470         u32 i;
1471
1472         if (mutex_lock_interruptible(&cam->fileop_mutex))
1473                 return -ERESTARTSYS;
1474
1475         if (cam->state & DEV_DISCONNECTED) {
1476                 DBG(1, "Device not present");
1477                 mutex_unlock(&cam->fileop_mutex);
1478                 return -ENODEV;
1479         }
1480
1481         if (cam->state & DEV_MISCONFIGURED) {
1482                 DBG(1, "The camera is misconfigured. Close and open it "
1483                        "again.");
1484                 mutex_unlock(&cam->fileop_mutex);
1485                 return -EIO;
1486         }
1487
1488         if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
1489             size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1490                 mutex_unlock(&cam->fileop_mutex);
1491                 return -EINVAL;
1492         }
1493
1494         for (i = 0; i < cam->nbuffers; i++) {
1495                 if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1496                         break;
1497         }
1498         if (i == cam->nbuffers) {
1499                 mutex_unlock(&cam->fileop_mutex);
1500                 return -EINVAL;
1501         }
1502
1503         vma->vm_flags |= VM_IO;
1504         vma->vm_flags |= VM_RESERVED;
1505
1506         pos = cam->frame[i].bufmem;
1507         while (size > 0) { /* size is page-aligned */
1508                 if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1509                         mutex_unlock(&cam->fileop_mutex);
1510                         return -EAGAIN;
1511                 }
1512                 start += PAGE_SIZE;
1513                 pos += PAGE_SIZE;
1514                 size -= PAGE_SIZE;
1515         }
1516
1517         vma->vm_ops = &et61x251_vm_ops;
1518         vma->vm_private_data = &cam->frame[i];
1519
1520         et61x251_vm_open(vma);
1521
1522         mutex_unlock(&cam->fileop_mutex);
1523
1524         return 0;
1525 }
1526
1527 /*****************************************************************************/
1528
1529 static int
1530 et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1531 {
1532         struct v4l2_capability cap = {
1533                 .driver = "et61x251",
1534                 .version = ET61X251_MODULE_VERSION_CODE,
1535                 .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1536                                 V4L2_CAP_STREAMING,
1537         };
1538
1539         strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1540         if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1541                 strlcpy(cap.bus_info, cam->usbdev->dev.bus_id,
1542                         sizeof(cap.bus_info));
1543
1544         if (copy_to_user(arg, &cap, sizeof(cap)))
1545                 return -EFAULT;
1546
1547         return 0;
1548 }
1549
1550
1551 static int
1552 et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1553 {
1554         struct v4l2_input i;
1555
1556         if (copy_from_user(&i, arg, sizeof(i)))
1557                 return -EFAULT;
1558
1559         if (i.index)
1560                 return -EINVAL;
1561
1562         memset(&i, 0, sizeof(i));
1563         strcpy(i.name, "Camera");
1564         i.type = V4L2_INPUT_TYPE_CAMERA;
1565
1566         if (copy_to_user(arg, &i, sizeof(i)))
1567                 return -EFAULT;
1568
1569         return 0;
1570 }
1571
1572
1573 static int
1574 et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1575 {
1576         int index = 0;
1577
1578         if (copy_to_user(arg, &index, sizeof(index)))
1579                 return -EFAULT;
1580
1581         return 0;
1582 }
1583
1584
1585 static int
1586 et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1587 {
1588         int index;
1589
1590         if (copy_from_user(&index, arg, sizeof(index)))
1591                 return -EFAULT;
1592
1593         if (index != 0)
1594                 return -EINVAL;
1595
1596         return 0;
1597 }
1598
1599
1600 static int
1601 et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1602 {
1603         struct et61x251_sensor* s = &cam->sensor;
1604         struct v4l2_queryctrl qc;
1605         u8 i;
1606
1607         if (copy_from_user(&qc, arg, sizeof(qc)))
1608                 return -EFAULT;
1609
1610         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1611                 if (qc.id && qc.id == s->qctrl[i].id) {
1612                         memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1613                         if (copy_to_user(arg, &qc, sizeof(qc)))
1614                                 return -EFAULT;
1615                         return 0;
1616                 }
1617
1618         return -EINVAL;
1619 }
1620
1621
1622 static int
1623 et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1624 {
1625         struct et61x251_sensor* s = &cam->sensor;
1626         struct v4l2_control ctrl;
1627         int err = 0;
1628         u8 i;
1629
1630         if (!s->get_ctrl && !s->set_ctrl)
1631                 return -EINVAL;
1632
1633         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1634                 return -EFAULT;
1635
1636         if (!s->get_ctrl) {
1637                 for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1638                         if (ctrl.id == s->qctrl[i].id) {
1639                                 ctrl.value = s->_qctrl[i].default_value;
1640                                 goto exit;
1641                         }
1642                 return -EINVAL;
1643         } else
1644                 err = s->get_ctrl(cam, &ctrl);
1645
1646 exit:
1647         if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1648                 return -EFAULT;
1649
1650         return err;
1651 }
1652
1653
1654 static int
1655 et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1656 {
1657         struct et61x251_sensor* s = &cam->sensor;
1658         struct v4l2_control ctrl;
1659         u8 i;
1660         int err = 0;
1661
1662         if (!s->set_ctrl)
1663                 return -EINVAL;
1664
1665         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1666                 return -EFAULT;
1667
1668         for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1669                 if (ctrl.id == s->qctrl[i].id) {
1670                         if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1671                                 return -EINVAL;
1672                         if (ctrl.value < s->qctrl[i].minimum ||
1673                             ctrl.value > s->qctrl[i].maximum)
1674                                 return -ERANGE;
1675                         ctrl.value -= ctrl.value % s->qctrl[i].step;
1676                         break;
1677                 }
1678
1679         if ((err = s->set_ctrl(cam, &ctrl)))
1680                 return err;
1681
1682         s->_qctrl[i].default_value = ctrl.value;
1683
1684         return 0;
1685 }
1686
1687
1688 static int
1689 et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1690 {
1691         struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1692
1693         cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1694         cc->pixelaspect.numerator = 1;
1695         cc->pixelaspect.denominator = 1;
1696
1697         if (copy_to_user(arg, cc, sizeof(*cc)))
1698                 return -EFAULT;
1699
1700         return 0;
1701 }
1702
1703
1704 static int
1705 et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1706 {
1707         struct et61x251_sensor* s = &cam->sensor;
1708         struct v4l2_crop crop = {
1709                 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1710         };
1711
1712         memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1713
1714         if (copy_to_user(arg, &crop, sizeof(crop)))
1715                 return -EFAULT;
1716
1717         return 0;
1718 }
1719
1720
1721 static int
1722 et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1723 {
1724         struct et61x251_sensor* s = &cam->sensor;
1725         struct v4l2_crop crop;
1726         struct v4l2_rect* rect;
1727         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1728         struct v4l2_pix_format* pix_format = &(s->pix_format);
1729         u8 scale;
1730         const enum et61x251_stream_state stream = cam->stream;
1731         const u32 nbuffers = cam->nbuffers;
1732         u32 i;
1733         int err = 0;
1734
1735         if (copy_from_user(&crop, arg, sizeof(crop)))
1736                 return -EFAULT;
1737
1738         rect = &(crop.c);
1739
1740         if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1741                 return -EINVAL;
1742
1743         if (cam->module_param.force_munmap)
1744                 for (i = 0; i < cam->nbuffers; i++)
1745                         if (cam->frame[i].vma_use_count) {
1746                                 DBG(3, "VIDIOC_S_CROP failed. "
1747                                        "Unmap the buffers first.");
1748                                 return -EINVAL;
1749                         }
1750
1751         /* Preserve R,G or B origin */
1752         rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1753         rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1754
1755         if (rect->width < 4)
1756                 rect->width = 4;
1757         if (rect->height < 4)
1758                 rect->height = 4;
1759         if (rect->width > bounds->width)
1760                 rect->width = bounds->width;
1761         if (rect->height > bounds->height)
1762                 rect->height = bounds->height;
1763         if (rect->left < bounds->left)
1764                 rect->left = bounds->left;
1765         if (rect->top < bounds->top)
1766                 rect->top = bounds->top;
1767         if (rect->left + rect->width > bounds->left + bounds->width)
1768                 rect->left = bounds->left+bounds->width - rect->width;
1769         if (rect->top + rect->height > bounds->top + bounds->height)
1770                 rect->top = bounds->top+bounds->height - rect->height;
1771
1772         rect->width &= ~3L;
1773         rect->height &= ~3L;
1774
1775         if (ET61X251_PRESERVE_IMGSCALE) {
1776                 /* Calculate the actual scaling factor */
1777                 u32 a, b;
1778                 a = rect->width * rect->height;
1779                 b = pix_format->width * pix_format->height;
1780                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1781         } else
1782                 scale = 1;
1783
1784         if (cam->stream == STREAM_ON)
1785                 if ((err = et61x251_stream_interrupt(cam)))
1786                         return err;
1787
1788         if (copy_to_user(arg, &crop, sizeof(crop))) {
1789                 cam->stream = stream;
1790                 return -EFAULT;
1791         }
1792
1793         if (cam->module_param.force_munmap || cam->io == IO_READ)
1794                 et61x251_release_buffers(cam);
1795
1796         err = et61x251_set_crop(cam, rect);
1797         if (s->set_crop)
1798                 err += s->set_crop(cam, rect);
1799         err += et61x251_set_scale(cam, scale);
1800
1801         if (err) { /* atomic, no rollback in ioctl() */
1802                 cam->state |= DEV_MISCONFIGURED;
1803                 DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1804                        "use the camera, close and open /dev/video%d again.",
1805                     cam->v4ldev->minor);
1806                 return -EIO;
1807         }
1808
1809         s->pix_format.width = rect->width/scale;
1810         s->pix_format.height = rect->height/scale;
1811         memcpy(&(s->_rect), rect, sizeof(*rect));
1812
1813         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1814             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1815                 cam->state |= DEV_MISCONFIGURED;
1816                 DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1817                        "use the camera, close and open /dev/video%d again.",
1818                     cam->v4ldev->minor);
1819                 return -ENOMEM;
1820         }
1821
1822         if (cam->io == IO_READ)
1823                 et61x251_empty_framequeues(cam);
1824         else if (cam->module_param.force_munmap)
1825                 et61x251_requeue_outqueue(cam);
1826
1827         cam->stream = stream;
1828
1829         return 0;
1830 }
1831
1832
1833 static int
1834 et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1835 {
1836         struct v4l2_fmtdesc fmtd;
1837
1838         if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1839                 return -EFAULT;
1840
1841         if (fmtd.index == 0) {
1842                 strcpy(fmtd.description, "bayer rgb");
1843                 fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1844         } else if (fmtd.index == 1) {
1845                 strcpy(fmtd.description, "compressed");
1846                 fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1847                 fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1848         } else
1849                 return -EINVAL;
1850
1851         fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1852         memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1853
1854         if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1855                 return -EFAULT;
1856
1857         return 0;
1858 }
1859
1860
1861 static int
1862 et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1863 {
1864         struct v4l2_format format;
1865         struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1866
1867         if (copy_from_user(&format, arg, sizeof(format)))
1868                 return -EFAULT;
1869
1870         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1871                 return -EINVAL;
1872
1873         pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1874                              ? 0 : (pfmt->width * pfmt->priv) / 8;
1875         pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1876         pfmt->field = V4L2_FIELD_NONE;
1877         memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1878
1879         if (copy_to_user(arg, &format, sizeof(format)))
1880                 return -EFAULT;
1881
1882         return 0;
1883 }
1884
1885
1886 static int
1887 et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1888                           void __user * arg)
1889 {
1890         struct et61x251_sensor* s = &cam->sensor;
1891         struct v4l2_format format;
1892         struct v4l2_pix_format* pix;
1893         struct v4l2_pix_format* pfmt = &(s->pix_format);
1894         struct v4l2_rect* bounds = &(s->cropcap.bounds);
1895         struct v4l2_rect rect;
1896         u8 scale;
1897         const enum et61x251_stream_state stream = cam->stream;
1898         const u32 nbuffers = cam->nbuffers;
1899         u32 i;
1900         int err = 0;
1901
1902         if (copy_from_user(&format, arg, sizeof(format)))
1903                 return -EFAULT;
1904
1905         pix = &(format.fmt.pix);
1906
1907         if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1908                 return -EINVAL;
1909
1910         memcpy(&rect, &(s->_rect), sizeof(rect));
1911
1912         { /* calculate the actual scaling factor */
1913                 u32 a, b;
1914                 a = rect.width * rect.height;
1915                 b = pix->width * pix->height;
1916                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1917         }
1918
1919         rect.width = scale * pix->width;
1920         rect.height = scale * pix->height;
1921
1922         if (rect.width < 4)
1923                 rect.width = 4;
1924         if (rect.height < 4)
1925                 rect.height = 4;
1926         if (rect.width > bounds->left + bounds->width - rect.left)
1927                 rect.width = bounds->left + bounds->width - rect.left;
1928         if (rect.height > bounds->top + bounds->height - rect.top)
1929                 rect.height = bounds->top + bounds->height - rect.top;
1930
1931         rect.width &= ~3L;
1932         rect.height &= ~3L;
1933
1934         { /* adjust the scaling factor */
1935                 u32 a, b;
1936                 a = rect.width * rect.height;
1937                 b = pix->width * pix->height;
1938                 scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1939         }
1940
1941         pix->width = rect.width / scale;
1942         pix->height = rect.height / scale;
1943
1944         if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
1945             pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
1946                 pix->pixelformat = pfmt->pixelformat;
1947         pix->priv = pfmt->priv; /* bpp */
1948         pix->colorspace = pfmt->colorspace;
1949         pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1950                             ? 0 : (pix->width * pix->priv) / 8;
1951         pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
1952         pix->field = V4L2_FIELD_NONE;
1953
1954         if (cmd == VIDIOC_TRY_FMT) {
1955                 if (copy_to_user(arg, &format, sizeof(format)))
1956                         return -EFAULT;
1957                 return 0;
1958         }
1959
1960         if (cam->module_param.force_munmap)
1961                 for (i = 0; i < cam->nbuffers; i++)
1962                         if (cam->frame[i].vma_use_count) {
1963                                 DBG(3, "VIDIOC_S_FMT failed. "
1964                                        "Unmap the buffers first.");
1965                                 return -EINVAL;
1966                         }
1967
1968         if (cam->stream == STREAM_ON)
1969                 if ((err = et61x251_stream_interrupt(cam)))
1970                         return err;
1971
1972         if (copy_to_user(arg, &format, sizeof(format))) {
1973                 cam->stream = stream;
1974                 return -EFAULT;
1975         }
1976
1977         if (cam->module_param.force_munmap || cam->io == IO_READ)
1978                 et61x251_release_buffers(cam);
1979
1980         err += et61x251_set_pix_format(cam, pix);
1981         err += et61x251_set_crop(cam, &rect);
1982         if (s->set_pix_format)
1983                 err += s->set_pix_format(cam, pix);
1984         if (s->set_crop)
1985                 err += s->set_crop(cam, &rect);
1986         err += et61x251_set_scale(cam, scale);
1987
1988         if (err) { /* atomic, no rollback in ioctl() */
1989                 cam->state |= DEV_MISCONFIGURED;
1990                 DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
1991                        "use the camera, close and open /dev/video%d again.",
1992                     cam->v4ldev->minor);
1993                 return -EIO;
1994         }
1995
1996         memcpy(pfmt, pix, sizeof(*pix));
1997         memcpy(&(s->_rect), &rect, sizeof(rect));
1998
1999         if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2000             nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2001                 cam->state |= DEV_MISCONFIGURED;
2002                 DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2003                        "use the camera, close and open /dev/video%d again.",
2004                     cam->v4ldev->minor);
2005                 return -ENOMEM;
2006         }
2007
2008         if (cam->io == IO_READ)
2009                 et61x251_empty_framequeues(cam);
2010         else if (cam->module_param.force_munmap)
2011                 et61x251_requeue_outqueue(cam);
2012
2013         cam->stream = stream;
2014
2015         return 0;
2016 }
2017
2018
2019 static int
2020 et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2021 {
2022         if (copy_to_user(arg, &cam->compression,
2023                          sizeof(cam->compression)))
2024                 return -EFAULT;
2025
2026         return 0;
2027 }
2028
2029
2030 static int
2031 et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2032 {
2033         struct v4l2_jpegcompression jc;
2034         const enum et61x251_stream_state stream = cam->stream;
2035         int err = 0;
2036
2037         if (copy_from_user(&jc, arg, sizeof(jc)))
2038                 return -EFAULT;
2039
2040         if (jc.quality != 0 && jc.quality != 1)
2041                 return -EINVAL;
2042
2043         if (cam->stream == STREAM_ON)
2044                 if ((err = et61x251_stream_interrupt(cam)))
2045                         return err;
2046
2047         err += et61x251_set_compression(cam, &jc);
2048         if (err) { /* atomic, no rollback in ioctl() */
2049                 cam->state |= DEV_MISCONFIGURED;
2050                 DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2051                        "problems. To use the camera, close and open "
2052                        "/dev/video%d again.", cam->v4ldev->minor);
2053                 return -EIO;
2054         }
2055
2056         cam->compression.quality = jc.quality;
2057
2058         cam->stream = stream;
2059
2060         return 0;
2061 }
2062
2063
2064 static int
2065 et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2066 {
2067         struct v4l2_requestbuffers rb;
2068         u32 i;
2069         int err;
2070
2071         if (copy_from_user(&rb, arg, sizeof(rb)))
2072                 return -EFAULT;
2073
2074         if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2075             rb.memory != V4L2_MEMORY_MMAP)
2076                 return -EINVAL;
2077
2078         if (cam->io == IO_READ) {
2079                 DBG(3, "Close and open the device again to choose the mmap "
2080                        "I/O method");
2081                 return -EINVAL;
2082         }
2083
2084         for (i = 0; i < cam->nbuffers; i++)
2085                 if (cam->frame[i].vma_use_count) {
2086                         DBG(3, "VIDIOC_REQBUFS failed. "
2087                                "Previous buffers are still mapped.");
2088                         return -EINVAL;
2089                 }
2090
2091         if (cam->stream == STREAM_ON)
2092                 if ((err = et61x251_stream_interrupt(cam)))
2093                         return err;
2094
2095         et61x251_empty_framequeues(cam);
2096
2097         et61x251_release_buffers(cam);
2098         if (rb.count)
2099                 rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2100
2101         if (copy_to_user(arg, &rb, sizeof(rb))) {
2102                 et61x251_release_buffers(cam);
2103                 cam->io = IO_NONE;
2104                 return -EFAULT;
2105         }
2106
2107         cam->io = rb.count ? IO_MMAP : IO_NONE;
2108
2109         return 0;
2110 }
2111
2112
2113 static int
2114 et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2115 {
2116         struct v4l2_buffer b;
2117
2118         if (copy_from_user(&b, arg, sizeof(b)))
2119                 return -EFAULT;
2120
2121         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2122             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2123                 return -EINVAL;
2124
2125         memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2126
2127         if (cam->frame[b.index].vma_use_count)
2128                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2129
2130         if (cam->frame[b.index].state == F_DONE)
2131                 b.flags |= V4L2_BUF_FLAG_DONE;
2132         else if (cam->frame[b.index].state != F_UNUSED)
2133                 b.flags |= V4L2_BUF_FLAG_QUEUED;
2134
2135         if (copy_to_user(arg, &b, sizeof(b)))
2136                 return -EFAULT;
2137
2138         return 0;
2139 }
2140
2141
2142 static int
2143 et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2144 {
2145         struct v4l2_buffer b;
2146         unsigned long lock_flags;
2147
2148         if (copy_from_user(&b, arg, sizeof(b)))
2149                 return -EFAULT;
2150
2151         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2152             b.index >= cam->nbuffers || cam->io != IO_MMAP)
2153                 return -EINVAL;
2154
2155         if (cam->frame[b.index].state != F_UNUSED)
2156                 return -EINVAL;
2157
2158         cam->frame[b.index].state = F_QUEUED;
2159
2160         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2161         list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2162         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2163
2164         PDBGG("Frame #%lu queued", (unsigned long)b.index);
2165
2166         return 0;
2167 }
2168
2169
2170 static int
2171 et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2172                       void __user * arg)
2173 {
2174         struct v4l2_buffer b;
2175         struct et61x251_frame_t *f;
2176         unsigned long lock_flags;
2177         long timeout;
2178
2179         if (copy_from_user(&b, arg, sizeof(b)))
2180                 return -EFAULT;
2181
2182         if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2183                 return -EINVAL;
2184
2185         if (list_empty(&cam->outqueue)) {
2186                 if (cam->stream == STREAM_OFF)
2187                         return -EINVAL;
2188                 if (filp->f_flags & O_NONBLOCK)
2189                         return -EAGAIN;
2190                 timeout = wait_event_interruptible_timeout
2191                           ( cam->wait_frame,
2192                             (!list_empty(&cam->outqueue)) ||
2193                             (cam->state & DEV_DISCONNECTED) ||
2194                             (cam->state & DEV_MISCONFIGURED),
2195                             cam->module_param.frame_timeout *
2196                             1000 * msecs_to_jiffies(1) );
2197                 if (timeout < 0)
2198                         return timeout;
2199                 if (cam->state & DEV_DISCONNECTED)
2200                         return -ENODEV;
2201                 if (!timeout || (cam->state & DEV_MISCONFIGURED))
2202                         return -EIO;
2203         }
2204
2205         spin_lock_irqsave(&cam->queue_lock, lock_flags);
2206         f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2207         list_del(cam->outqueue.next);
2208         spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2209
2210         f->state = F_UNUSED;
2211
2212         memcpy(&b, &f->buf, sizeof(b));
2213         if (f->vma_use_count)
2214                 b.flags |= V4L2_BUF_FLAG_MAPPED;
2215
2216         if (copy_to_user(arg, &b, sizeof(b)))
2217                 return -EFAULT;
2218
2219         PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2220
2221         return 0;
2222 }
2223
2224
2225 static int
2226 et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2227 {
2228         int type;
2229
2230         if (copy_from_user(&type, arg, sizeof(type)))
2231                 return -EFAULT;
2232
2233         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2234                 return -EINVAL;
2235
2236         if (list_empty(&cam->inqueue))
2237                 return -EINVAL;
2238
2239         cam->stream = STREAM_ON;
2240
2241         DBG(3, "Stream on");
2242
2243         return 0;
2244 }
2245
2246
2247 static int
2248 et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2249 {
2250         int type, err;
2251
2252         if (copy_from_user(&type, arg, sizeof(type)))
2253                 return -EFAULT;
2254
2255         if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2256                 return -EINVAL;
2257
2258         if (cam->stream == STREAM_ON)
2259                 if ((err = et61x251_stream_interrupt(cam)))
2260                         return err;
2261
2262         et61x251_empty_framequeues(cam);
2263
2264         DBG(3, "Stream off");
2265
2266         return 0;
2267 }
2268
2269
2270 static int
2271 et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2272 {
2273         struct v4l2_streamparm sp;
2274
2275         if (copy_from_user(&sp, arg, sizeof(sp)))
2276                 return -EFAULT;
2277
2278         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2279                 return -EINVAL;
2280
2281         sp.parm.capture.extendedmode = 0;
2282         sp.parm.capture.readbuffers = cam->nreadbuffers;
2283
2284         if (copy_to_user(arg, &sp, sizeof(sp)))
2285                 return -EFAULT;
2286
2287         return 0;
2288 }
2289
2290
2291 static int
2292 et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2293 {
2294         struct v4l2_streamparm sp;
2295
2296         if (copy_from_user(&sp, arg, sizeof(sp)))
2297                 return -EFAULT;
2298
2299         if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2300                 return -EINVAL;
2301
2302         sp.parm.capture.extendedmode = 0;
2303
2304         if (sp.parm.capture.readbuffers == 0)
2305                 sp.parm.capture.readbuffers = cam->nreadbuffers;
2306
2307         if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2308                 sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2309
2310         if (copy_to_user(arg, &sp, sizeof(sp)))
2311                 return -EFAULT;
2312
2313         cam->nreadbuffers = sp.parm.capture.readbuffers;
2314
2315         return 0;
2316 }
2317
2318
2319 static int et61x251_ioctl_v4l2(struct inode* inode, struct file* filp,
2320                                unsigned int cmd, void __user * arg)
2321 {
2322         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2323
2324         switch (cmd) {
2325
2326         case VIDIOC_QUERYCAP:
2327                 return et61x251_vidioc_querycap(cam, arg);
2328
2329         case VIDIOC_ENUMINPUT:
2330                 return et61x251_vidioc_enuminput(cam, arg);
2331
2332         case VIDIOC_G_INPUT:
2333                 return et61x251_vidioc_g_input(cam, arg);
2334
2335         case VIDIOC_S_INPUT:
2336                 return et61x251_vidioc_s_input(cam, arg);
2337
2338         case VIDIOC_QUERYCTRL:
2339                 return et61x251_vidioc_query_ctrl(cam, arg);
2340
2341         case VIDIOC_G_CTRL:
2342                 return et61x251_vidioc_g_ctrl(cam, arg);
2343
2344         case VIDIOC_S_CTRL:
2345                 return et61x251_vidioc_s_ctrl(cam, arg);
2346
2347         case VIDIOC_CROPCAP:
2348                 return et61x251_vidioc_cropcap(cam, arg);
2349
2350         case VIDIOC_G_CROP:
2351                 return et61x251_vidioc_g_crop(cam, arg);
2352
2353         case VIDIOC_S_CROP:
2354                 return et61x251_vidioc_s_crop(cam, arg);
2355
2356         case VIDIOC_ENUM_FMT:
2357                 return et61x251_vidioc_enum_fmt(cam, arg);
2358
2359         case VIDIOC_G_FMT:
2360                 return et61x251_vidioc_g_fmt(cam, arg);
2361
2362         case VIDIOC_TRY_FMT:
2363         case VIDIOC_S_FMT:
2364                 return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2365
2366         case VIDIOC_G_JPEGCOMP:
2367                 return et61x251_vidioc_g_jpegcomp(cam, arg);
2368
2369         case VIDIOC_S_JPEGCOMP:
2370                 return et61x251_vidioc_s_jpegcomp(cam, arg);
2371
2372         case VIDIOC_REQBUFS:
2373                 return et61x251_vidioc_reqbufs(cam, arg);
2374
2375         case VIDIOC_QUERYBUF:
2376                 return et61x251_vidioc_querybuf(cam, arg);
2377
2378         case VIDIOC_QBUF:
2379                 return et61x251_vidioc_qbuf(cam, arg);
2380
2381         case VIDIOC_DQBUF:
2382                 return et61x251_vidioc_dqbuf(cam, filp, arg);
2383
2384         case VIDIOC_STREAMON:
2385                 return et61x251_vidioc_streamon(cam, arg);
2386
2387         case VIDIOC_STREAMOFF:
2388                 return et61x251_vidioc_streamoff(cam, arg);
2389
2390         case VIDIOC_G_PARM:
2391                 return et61x251_vidioc_g_parm(cam, arg);
2392
2393         case VIDIOC_S_PARM:
2394                 return et61x251_vidioc_s_parm(cam, arg);
2395
2396         case VIDIOC_G_STD:
2397         case VIDIOC_S_STD:
2398         case VIDIOC_QUERYSTD:
2399         case VIDIOC_ENUMSTD:
2400         case VIDIOC_QUERYMENU:
2401                 return -EINVAL;
2402
2403         default:
2404                 return -EINVAL;
2405
2406         }
2407 }
2408
2409
2410 static int et61x251_ioctl(struct inode* inode, struct file* filp,
2411                          unsigned int cmd, unsigned long arg)
2412 {
2413         struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
2414         int err = 0;
2415
2416         if (mutex_lock_interruptible(&cam->fileop_mutex))
2417                 return -ERESTARTSYS;
2418
2419         if (cam->state & DEV_DISCONNECTED) {
2420                 DBG(1, "Device not present");
2421                 mutex_unlock(&cam->fileop_mutex);
2422                 return -ENODEV;
2423         }
2424
2425         if (cam->state & DEV_MISCONFIGURED) {
2426                 DBG(1, "The camera is misconfigured. Close and open it "
2427                        "again.");
2428                 mutex_unlock(&cam->fileop_mutex);
2429                 return -EIO;
2430         }
2431
2432         V4LDBG(3, "et61x251", cmd);
2433
2434         err = et61x251_ioctl_v4l2(inode, filp, cmd, (void __user *)arg);
2435
2436         mutex_unlock(&cam->fileop_mutex);
2437
2438         return err;
2439 }
2440
2441
2442 static struct file_operations et61x251_fops = {
2443         .owner = THIS_MODULE,
2444         .open =    et61x251_open,
2445         .release = et61x251_release,
2446         .ioctl =   et61x251_ioctl,
2447         .read =    et61x251_read,
2448         .poll =    et61x251_poll,
2449         .mmap =    et61x251_mmap,
2450         .llseek =  no_llseek,
2451 };
2452
2453 /*****************************************************************************/
2454
2455 /* It exists a single interface only. We do not need to validate anything. */
2456 static int
2457 et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2458 {
2459         struct usb_device *udev = interface_to_usbdev(intf);
2460         struct et61x251_device* cam;
2461         static unsigned int dev_nr = 0;
2462         unsigned int i;
2463         int err = 0;
2464
2465         if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2466                 return -ENOMEM;
2467
2468         cam->usbdev = udev;
2469
2470         if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2471                 DBG(1, "kmalloc() failed");
2472                 err = -ENOMEM;
2473                 goto fail;
2474         }
2475
2476         if (!(cam->v4ldev = video_device_alloc())) {
2477                 DBG(1, "video_device_alloc() failed");
2478                 err = -ENOMEM;
2479                 goto fail;
2480         }
2481
2482         mutex_init(&cam->dev_mutex);
2483
2484         DBG(2, "ET61X[12]51 PC Camera Controller detected "
2485                "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct);
2486
2487         for  (i = 0; et61x251_sensor_table[i]; i++) {
2488                 err = et61x251_sensor_table[i](cam);
2489                 if (!err)
2490                         break;
2491         }
2492
2493         if (!err)
2494                 DBG(2, "%s image sensor detected", cam->sensor.name);
2495         else {
2496                 DBG(1, "No supported image sensor detected");
2497                 err = -ENODEV;
2498                 goto fail;
2499         }
2500
2501         if (et61x251_init(cam)) {
2502                 DBG(1, "Initialization failed. I will retry on open().");
2503                 cam->state |= DEV_MISCONFIGURED;
2504         }
2505
2506         strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2507         cam->v4ldev->owner = THIS_MODULE;
2508         cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES;
2509         cam->v4ldev->hardware = 0;
2510         cam->v4ldev->fops = &et61x251_fops;
2511         cam->v4ldev->minor = video_nr[dev_nr];
2512         cam->v4ldev->release = video_device_release;
2513         video_set_drvdata(cam->v4ldev, cam);
2514
2515         mutex_lock(&cam->dev_mutex);
2516
2517         err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2518                                     video_nr[dev_nr]);
2519         if (err) {
2520                 DBG(1, "V4L2 device registration failed");
2521                 if (err == -ENFILE && video_nr[dev_nr] == -1)
2522                         DBG(1, "Free /dev/videoX node not found");
2523                 video_nr[dev_nr] = -1;
2524                 dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2525                 mutex_unlock(&cam->dev_mutex);
2526                 goto fail;
2527         }
2528
2529         DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
2530
2531         cam->module_param.force_munmap = force_munmap[dev_nr];
2532         cam->module_param.frame_timeout = frame_timeout[dev_nr];
2533
2534         dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2535
2536 #ifdef CONFIG_VIDEO_ADV_DEBUG
2537         et61x251_create_sysfs(cam);
2538         DBG(2, "Optional device control through 'sysfs' interface ready");
2539 #endif
2540
2541         usb_set_intfdata(intf, cam);
2542
2543         mutex_unlock(&cam->dev_mutex);
2544
2545         return 0;
2546
2547 fail:
2548         if (cam) {
2549                 kfree(cam->control_buffer);
2550                 if (cam->v4ldev)
2551                         video_device_release(cam->v4ldev);
2552                 kfree(cam);
2553         }
2554         return err;
2555 }
2556
2557
2558 static void et61x251_usb_disconnect(struct usb_interface* intf)
2559 {
2560         struct et61x251_device* cam = usb_get_intfdata(intf);
2561
2562         if (!cam)
2563                 return;
2564
2565         down_write(&et61x251_disconnect);
2566
2567         mutex_lock(&cam->dev_mutex);
2568
2569         DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2570
2571         wake_up_interruptible_all(&cam->open);
2572
2573         if (cam->users) {
2574                 DBG(2, "Device /dev/video%d is open! Deregistration and "
2575                        "memory deallocation are deferred on close.",
2576                     cam->v4ldev->minor);
2577                 cam->state |= DEV_MISCONFIGURED;
2578                 et61x251_stop_transfer(cam);
2579                 cam->state |= DEV_DISCONNECTED;
2580                 wake_up_interruptible(&cam->wait_frame);
2581                 wake_up(&cam->wait_stream);
2582                 usb_get_dev(cam->usbdev);
2583         } else {
2584                 cam->state |= DEV_DISCONNECTED;
2585                 et61x251_release_resources(cam);
2586         }
2587
2588         mutex_unlock(&cam->dev_mutex);
2589
2590         if (!cam->users)
2591                 kfree(cam);
2592
2593         up_write(&et61x251_disconnect);
2594 }
2595
2596
2597 static struct usb_driver et61x251_usb_driver = {
2598         .name =       "et61x251",
2599         .id_table =   et61x251_id_table,
2600         .probe =      et61x251_usb_probe,
2601         .disconnect = et61x251_usb_disconnect,
2602 };
2603
2604 /*****************************************************************************/
2605
2606 static int __init et61x251_module_init(void)
2607 {
2608         int err = 0;
2609
2610         KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2611         KDBG(3, ET61X251_MODULE_AUTHOR);
2612
2613         if ((err = usb_register(&et61x251_usb_driver)))
2614                 KDBG(1, "usb_register() failed");
2615
2616         return err;
2617 }
2618
2619
2620 static void __exit et61x251_module_exit(void)
2621 {
2622         usb_deregister(&et61x251_usb_driver);
2623 }
2624
2625
2626 module_init(et61x251_module_init);
2627 module_exit(et61x251_module_exit);