linux/drivers/media/video/et61x251/et61x251_core.c
<<
>>
Prefs
   1/***************************************************************************
   2 * V4L2 driver for ET61X[12]51 PC Camera Controllers                       *
   3 *                                                                         *
   4 * Copyright (C) 2006-2007 by Luca Risolia <luca.risolia@studio.unibo.it>  *
   5 *                                                                         *
   6 * This program is free software; you can redistribute it and/or modify    *
   7 * it under the terms of the GNU General Public License as published by    *
   8 * the Free Software Foundation; either version 2 of the License, or       *
   9 * (at your option) any later version.                                     *
  10 *                                                                         *
  11 * This program is distributed in the hope that it will be useful,         *
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
  14 * GNU General Public License for more details.                            *
  15 *                                                                         *
  16 * You should have received a copy of the GNU General Public License       *
  17 * along with this program; if not, write to the Free Software             *
  18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               *
  19 ***************************************************************************/
  20
  21#include <linux/module.h>
  22#include <linux/init.h>
  23#include <linux/kernel.h>
  24#include <linux/param.h>
  25#include <linux/errno.h>
  26#include <linux/slab.h>
  27#include <linux/device.h>
  28#include <linux/fs.h>
  29#include <linux/delay.h>
  30#include <linux/compiler.h>
  31#include <linux/ioctl.h>
  32#include <linux/poll.h>
  33#include <linux/stat.h>
  34#include <linux/mm.h>
  35#include <linux/vmalloc.h>
  36#include <linux/page-flags.h>
  37#include <media/v4l2-ioctl.h>
  38#include <asm/byteorder.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) 2006-2007 Luca Risolia"
  49#define ET61X251_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
  50#define ET61X251_MODULE_LICENSE "GPL"
  51#define ET61X251_MODULE_VERSION "1:1.09"
  52#define ET61X251_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 9)
  53
  54/*****************************************************************************/
  55
  56MODULE_DEVICE_TABLE(usb, et61x251_id_table);
  57
  58MODULE_AUTHOR(ET61X251_MODULE_AUTHOR " " ET61X251_AUTHOR_EMAIL);
  59MODULE_DESCRIPTION(ET61X251_MODULE_NAME);
  60MODULE_VERSION(ET61X251_MODULE_VERSION);
  61MODULE_LICENSE(ET61X251_MODULE_LICENSE);
  62
  63static short video_nr[] = {[0 ... ET61X251_MAX_DEVICES-1] = -1};
  64module_param_array(video_nr, short, NULL, 0444);
  65MODULE_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
  77static short force_munmap[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  78                               ET61X251_FORCE_MUNMAP};
  79module_param_array(force_munmap, bool, NULL, 0444);
  80MODULE_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(ET61X251_FORCE_MUNMAP)"."
  89                 "\n");
  90
  91static unsigned int frame_timeout[] = {[0 ... ET61X251_MAX_DEVICES-1] =
  92                                       ET61X251_FRAME_TIMEOUT};
  93module_param_array(frame_timeout, uint, NULL, 0644);
  94MODULE_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
 102static unsigned short debug = ET61X251_DEBUG_LEVEL;
 103module_param(debug, ushort, 0644);
 104MODULE_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
 118static u32
 119et61x251_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_user(cam->nbuffers *
 137                                            PAGE_ALIGN(imagesize))))
 138                        break;
 139                cam->nbuffers--;
 140        }
 141
 142        for (i = 0; i < cam->nbuffers; i++) {
 143                cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize);
 144                cam->frame[i].buf.index = i;
 145                cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize);
 146                cam->frame[i].buf.length = imagesize;
 147                cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 148                cam->frame[i].buf.sequence = 0;
 149                cam->frame[i].buf.field = V4L2_FIELD_NONE;
 150                cam->frame[i].buf.memory = V4L2_MEMORY_MMAP;
 151                cam->frame[i].buf.flags = 0;
 152        }
 153
 154        return cam->nbuffers;
 155}
 156
 157
 158static void et61x251_release_buffers(struct et61x251_device* cam)
 159{
 160        if (cam->nbuffers) {
 161                vfree(cam->frame[0].bufmem);
 162                cam->nbuffers = 0;
 163        }
 164        cam->frame_current = NULL;
 165}
 166
 167
 168static void et61x251_empty_framequeues(struct et61x251_device* cam)
 169{
 170        u32 i;
 171
 172        INIT_LIST_HEAD(&cam->inqueue);
 173        INIT_LIST_HEAD(&cam->outqueue);
 174
 175        for (i = 0; i < ET61X251_MAX_FRAMES; i++) {
 176                cam->frame[i].state = F_UNUSED;
 177                cam->frame[i].buf.bytesused = 0;
 178        }
 179}
 180
 181
 182static void et61x251_requeue_outqueue(struct et61x251_device* cam)
 183{
 184        struct et61x251_frame_t *i;
 185
 186        list_for_each_entry(i, &cam->outqueue, frame) {
 187                i->state = F_QUEUED;
 188                list_add(&i->frame, &cam->inqueue);
 189        }
 190
 191        INIT_LIST_HEAD(&cam->outqueue);
 192}
 193
 194
 195static void et61x251_queue_unusedframes(struct et61x251_device* cam)
 196{
 197        unsigned long lock_flags;
 198        u32 i;
 199
 200        for (i = 0; i < cam->nbuffers; i++)
 201                if (cam->frame[i].state == F_UNUSED) {
 202                        cam->frame[i].state = F_QUEUED;
 203                        spin_lock_irqsave(&cam->queue_lock, lock_flags);
 204                        list_add_tail(&cam->frame[i].frame, &cam->inqueue);
 205                        spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
 206                }
 207}
 208
 209/*****************************************************************************/
 210
 211int et61x251_write_reg(struct et61x251_device* cam, u8 value, u16 index)
 212{
 213        struct usb_device* udev = cam->usbdev;
 214        u8* buff = cam->control_buffer;
 215        int res;
 216
 217        *buff = value;
 218
 219        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 220                              0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 221        if (res < 0) {
 222                DBG(3, "Failed to write a register (value 0x%02X, index "
 223                       "0x%02X, error %d)", value, index, res);
 224                return -1;
 225        }
 226
 227        return 0;
 228}
 229
 230
 231static int et61x251_read_reg(struct et61x251_device* cam, u16 index)
 232{
 233        struct usb_device* udev = cam->usbdev;
 234        u8* buff = cam->control_buffer;
 235        int res;
 236
 237        res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 238                              0, index, buff, 1, ET61X251_CTRL_TIMEOUT);
 239        if (res < 0)
 240                DBG(3, "Failed to read a register (index 0x%02X, error %d)",
 241                    index, res);
 242
 243        return (res >= 0) ? (int)(*buff) : -1;
 244}
 245
 246
 247static int
 248et61x251_i2c_wait(struct et61x251_device* cam,
 249                  const struct et61x251_sensor* sensor)
 250{
 251        int i, r;
 252
 253        for (i = 1; i <= 8; i++) {
 254                if (sensor->interface == ET61X251_I2C_3WIRES) {
 255                        r = et61x251_read_reg(cam, 0x8e);
 256                        if (!(r & 0x02) && (r >= 0))
 257                                return 0;
 258                } else {
 259                        r = et61x251_read_reg(cam, 0x8b);
 260                        if (!(r & 0x01) && (r >= 0))
 261                                return 0;
 262                }
 263                if (r < 0)
 264                        return -EIO;
 265                udelay(8*8); /* minimum for sensors at 400kHz */
 266        }
 267
 268        return -EBUSY;
 269}
 270
 271
 272int
 273et61x251_i2c_raw_write(struct et61x251_device* cam, u8 n, u8 data1, u8 data2,
 274                       u8 data3, u8 data4, u8 data5, u8 data6, u8 data7,
 275                       u8 data8, u8 address)
 276{
 277        struct usb_device* udev = cam->usbdev;
 278        u8* data = cam->control_buffer;
 279        int err = 0, res;
 280
 281        data[0] = data2;
 282        data[1] = data3;
 283        data[2] = data4;
 284        data[3] = data5;
 285        data[4] = data6;
 286        data[5] = data7;
 287        data[6] = data8;
 288        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 289                              0, 0x81, data, n-1, ET61X251_CTRL_TIMEOUT);
 290        if (res < 0)
 291                err += res;
 292
 293        data[0] = address;
 294        data[1] = cam->sensor.i2c_slave_id;
 295        data[2] = cam->sensor.rsta | 0x02 | (n << 4);
 296        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 297                              0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 298        if (res < 0)
 299                err += res;
 300
 301        /* Start writing through the serial interface */
 302        data[0] = data1;
 303        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 304                              0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 305        if (res < 0)
 306                err += res;
 307
 308        err += et61x251_i2c_wait(cam, &cam->sensor);
 309
 310        if (err)
 311                DBG(3, "I2C raw write failed for %s image sensor",
 312                    cam->sensor.name);
 313
 314        PDBGG("I2C raw write: %u bytes, address = 0x%02X, data1 = 0x%02X, "
 315              "data2 = 0x%02X, data3 = 0x%02X, data4 = 0x%02X, data5 = 0x%02X,"
 316              " data6 = 0x%02X, data7 = 0x%02X, data8 = 0x%02X", n, address,
 317              data1, data2, data3, data4, data5, data6, data7, data8);
 318
 319        return err ? -1 : 0;
 320
 321}
 322
 323
 324/*****************************************************************************/
 325
 326static void et61x251_urb_complete(struct urb *urb)
 327{
 328        struct et61x251_device* cam = urb->context;
 329        struct et61x251_frame_t** f;
 330        size_t imagesize;
 331        u8 i;
 332        int err = 0;
 333
 334        if (urb->status == -ENOENT)
 335                return;
 336
 337        f = &cam->frame_current;
 338
 339        if (cam->stream == STREAM_INTERRUPT) {
 340                cam->stream = STREAM_OFF;
 341                if ((*f))
 342                        (*f)->state = F_QUEUED;
 343                DBG(3, "Stream interrupted");
 344                wake_up(&cam->wait_stream);
 345        }
 346
 347        if (cam->state & DEV_DISCONNECTED)
 348                return;
 349
 350        if (cam->state & DEV_MISCONFIGURED) {
 351                wake_up_interruptible(&cam->wait_frame);
 352                return;
 353        }
 354
 355        if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue))
 356                goto resubmit_urb;
 357
 358        if (!(*f))
 359                (*f) = list_entry(cam->inqueue.next, struct et61x251_frame_t,
 360                                  frame);
 361
 362        imagesize = (cam->sensor.pix_format.width *
 363                     cam->sensor.pix_format.height *
 364                     cam->sensor.pix_format.priv) / 8;
 365
 366        for (i = 0; i < urb->number_of_packets; i++) {
 367                unsigned int len, status;
 368                void *pos;
 369                u8* b1, * b2, sof;
 370                const u8 VOID_BYTES = 6;
 371                size_t imglen;
 372
 373                len = urb->iso_frame_desc[i].actual_length;
 374                status = urb->iso_frame_desc[i].status;
 375                pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer;
 376
 377                if (status) {
 378                        DBG(3, "Error in isochronous frame");
 379                        (*f)->state = F_ERROR;
 380                        continue;
 381                }
 382
 383                b1 = pos++;
 384                b2 = pos++;
 385                sof = ((*b1 & 0x3f) == 63);
 386                imglen = ((*b1 & 0xc0) << 2) | *b2;
 387
 388                PDBGG("Isochrnous frame: length %u, #%u i, image length %zu",
 389                      len, i, imglen);
 390
 391                if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR)
 392start_of_frame:
 393                        if (sof) {
 394                                (*f)->state = F_GRABBING;
 395                                (*f)->buf.bytesused = 0;
 396                                do_gettimeofday(&(*f)->buf.timestamp);
 397                                pos += 22;
 398                                DBG(3, "SOF detected: new video frame");
 399                        }
 400
 401                if ((*f)->state == F_GRABBING) {
 402                        if (sof && (*f)->buf.bytesused) {
 403                                if (cam->sensor.pix_format.pixelformat ==
 404                                                         V4L2_PIX_FMT_ET61X251)
 405                                        goto end_of_frame;
 406                                else {
 407                                        DBG(3, "Not expected SOF detected "
 408                                               "after %lu bytes",
 409                                           (unsigned long)(*f)->buf.bytesused);
 410                                        (*f)->state = F_ERROR;
 411                                        continue;
 412                                }
 413                        }
 414
 415                        if ((*f)->buf.bytesused + imglen > imagesize) {
 416                                DBG(3, "Video frame size exceeded");
 417                                (*f)->state = F_ERROR;
 418                                continue;
 419                        }
 420
 421                        pos += VOID_BYTES;
 422
 423                        memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, imglen);
 424                        (*f)->buf.bytesused += imglen;
 425
 426                        if ((*f)->buf.bytesused == imagesize) {
 427                                u32 b;
 428end_of_frame:
 429                                b = (*f)->buf.bytesused;
 430                                (*f)->state = F_DONE;
 431                                (*f)->buf.sequence= ++cam->frame_count;
 432                                spin_lock(&cam->queue_lock);
 433                                list_move_tail(&(*f)->frame, &cam->outqueue);
 434                                if (!list_empty(&cam->inqueue))
 435                                        (*f) = list_entry(cam->inqueue.next,
 436                                                       struct et61x251_frame_t,
 437                                                          frame);
 438                                else
 439                                        (*f) = NULL;
 440                                spin_unlock(&cam->queue_lock);
 441                                DBG(3, "Video frame captured: : %lu bytes",
 442                                       (unsigned long)(b));
 443
 444                                if (!(*f))
 445                                        goto resubmit_urb;
 446
 447                                if (sof &&
 448                                    cam->sensor.pix_format.pixelformat ==
 449                                                         V4L2_PIX_FMT_ET61X251)
 450                                        goto start_of_frame;
 451                        }
 452                }
 453        }
 454
 455resubmit_urb:
 456        urb->dev = cam->usbdev;
 457        err = usb_submit_urb(urb, GFP_ATOMIC);
 458        if (err < 0 && err != -EPERM) {
 459                cam->state |= DEV_MISCONFIGURED;
 460                DBG(1, "usb_submit_urb() failed");
 461        }
 462
 463        wake_up_interruptible(&cam->wait_frame);
 464}
 465
 466
 467static int et61x251_start_transfer(struct et61x251_device* cam)
 468{
 469        struct usb_device *udev = cam->usbdev;
 470        struct urb* urb;
 471        struct usb_host_interface* altsetting = usb_altnum_to_altsetting(
 472                                                   usb_ifnum_to_if(udev, 0),
 473                                                   ET61X251_ALTERNATE_SETTING);
 474        const unsigned int psz = le16_to_cpu(altsetting->
 475                                             endpoint[0].desc.wMaxPacketSize);
 476        s8 i, j;
 477        int err = 0;
 478
 479        for (i = 0; i < ET61X251_URBS; i++) {
 480                cam->transfer_buffer[i] = kzalloc(ET61X251_ISO_PACKETS * psz,
 481                                                  GFP_KERNEL);
 482                if (!cam->transfer_buffer[i]) {
 483                        err = -ENOMEM;
 484                        DBG(1, "Not enough memory");
 485                        goto free_buffers;
 486                }
 487        }
 488
 489        for (i = 0; i < ET61X251_URBS; i++) {
 490                urb = usb_alloc_urb(ET61X251_ISO_PACKETS, GFP_KERNEL);
 491                cam->urb[i] = urb;
 492                if (!urb) {
 493                        err = -ENOMEM;
 494                        DBG(1, "usb_alloc_urb() failed");
 495                        goto free_urbs;
 496                }
 497                urb->dev = udev;
 498                urb->context = cam;
 499                urb->pipe = usb_rcvisocpipe(udev, 1);
 500                urb->transfer_flags = URB_ISO_ASAP;
 501                urb->number_of_packets = ET61X251_ISO_PACKETS;
 502                urb->complete = et61x251_urb_complete;
 503                urb->transfer_buffer = cam->transfer_buffer[i];
 504                urb->transfer_buffer_length = psz * ET61X251_ISO_PACKETS;
 505                urb->interval = 1;
 506                for (j = 0; j < ET61X251_ISO_PACKETS; j++) {
 507                        urb->iso_frame_desc[j].offset = psz * j;
 508                        urb->iso_frame_desc[j].length = psz;
 509                }
 510        }
 511
 512        err = et61x251_write_reg(cam, 0x01, 0x03);
 513        err = et61x251_write_reg(cam, 0x00, 0x03);
 514        err = et61x251_write_reg(cam, 0x08, 0x03);
 515        if (err) {
 516                err = -EIO;
 517                DBG(1, "I/O hardware error");
 518                goto free_urbs;
 519        }
 520
 521        err = usb_set_interface(udev, 0, ET61X251_ALTERNATE_SETTING);
 522        if (err) {
 523                DBG(1, "usb_set_interface() failed");
 524                goto free_urbs;
 525        }
 526
 527        cam->frame_current = NULL;
 528
 529        for (i = 0; i < ET61X251_URBS; i++) {
 530                err = usb_submit_urb(cam->urb[i], GFP_KERNEL);
 531                if (err) {
 532                        for (j = i-1; j >= 0; j--)
 533                                usb_kill_urb(cam->urb[j]);
 534                        DBG(1, "usb_submit_urb() failed, error %d", err);
 535                        goto free_urbs;
 536                }
 537        }
 538
 539        return 0;
 540
 541free_urbs:
 542        for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
 543                usb_free_urb(cam->urb[i]);
 544
 545free_buffers:
 546        for (i = 0; (i < ET61X251_URBS) && cam->transfer_buffer[i]; i++)
 547                kfree(cam->transfer_buffer[i]);
 548
 549        return err;
 550}
 551
 552
 553static int et61x251_stop_transfer(struct et61x251_device* cam)
 554{
 555        struct usb_device *udev = cam->usbdev;
 556        s8 i;
 557        int err = 0;
 558
 559        if (cam->state & DEV_DISCONNECTED)
 560                return 0;
 561
 562        for (i = ET61X251_URBS-1; i >= 0; i--) {
 563                usb_kill_urb(cam->urb[i]);
 564                usb_free_urb(cam->urb[i]);
 565                kfree(cam->transfer_buffer[i]);
 566        }
 567
 568        err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */
 569        if (err)
 570                DBG(3, "usb_set_interface() failed");
 571
 572        return err;
 573}
 574
 575
 576static int et61x251_stream_interrupt(struct et61x251_device* cam)
 577{
 578        long timeout;
 579
 580        cam->stream = STREAM_INTERRUPT;
 581        timeout = wait_event_timeout(cam->wait_stream,
 582                                     (cam->stream == STREAM_OFF) ||
 583                                     (cam->state & DEV_DISCONNECTED),
 584                                     ET61X251_URB_TIMEOUT);
 585        if (cam->state & DEV_DISCONNECTED)
 586                return -ENODEV;
 587        else if (cam->stream != STREAM_OFF) {
 588                cam->state |= DEV_MISCONFIGURED;
 589                DBG(1, "URB timeout reached. The camera is misconfigured. To "
 590                       "use it, close and open %s again.",
 591                    video_device_node_name(cam->v4ldev));
 592                return -EIO;
 593        }
 594
 595        return 0;
 596}
 597
 598/*****************************************************************************/
 599
 600#ifdef CONFIG_VIDEO_ADV_DEBUG
 601
 602static int et61x251_i2c_try_read(struct et61x251_device* cam,
 603                                 const struct et61x251_sensor* sensor,
 604                                 u8 address)
 605{
 606        struct usb_device* udev = cam->usbdev;
 607        u8* data = cam->control_buffer;
 608        int err = 0, res;
 609
 610        data[0] = address;
 611        data[1] = cam->sensor.i2c_slave_id;
 612        data[2] = cam->sensor.rsta | 0x10;
 613        data[3] = !(et61x251_read_reg(cam, 0x8b) & 0x02);
 614        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 615                              0, 0x88, data, 4, ET61X251_CTRL_TIMEOUT);
 616        if (res < 0)
 617                err += res;
 618
 619        err += et61x251_i2c_wait(cam, sensor);
 620
 621        res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00, 0xc1,
 622                              0, 0x80, data, 8, ET61X251_CTRL_TIMEOUT);
 623        if (res < 0)
 624                err += res;
 625
 626        if (err)
 627                DBG(3, "I2C read failed for %s image sensor", sensor->name);
 628
 629        PDBGG("I2C read: address 0x%02X, value: 0x%02X", address, data[0]);
 630
 631        return err ? -1 : (int)data[0];
 632}
 633
 634
 635static int et61x251_i2c_try_write(struct et61x251_device* cam,
 636                                  const struct et61x251_sensor* sensor,
 637                                  u8 address, u8 value)
 638{
 639        struct usb_device* udev = cam->usbdev;
 640        u8* data = cam->control_buffer;
 641        int err = 0, res;
 642
 643        data[0] = address;
 644        data[1] = cam->sensor.i2c_slave_id;
 645        data[2] = cam->sensor.rsta | 0x12;
 646        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 647                              0, 0x88, data, 3, ET61X251_CTRL_TIMEOUT);
 648        if (res < 0)
 649                err += res;
 650
 651        data[0] = value;
 652        res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00, 0x41,
 653                              0, 0x80, data, 1, ET61X251_CTRL_TIMEOUT);
 654        if (res < 0)
 655                err += res;
 656
 657        err += et61x251_i2c_wait(cam, sensor);
 658
 659        if (err)
 660                DBG(3, "I2C write failed for %s image sensor", sensor->name);
 661
 662        PDBGG("I2C write: address 0x%02X, value: 0x%02X", address, value);
 663
 664        return err ? -1 : 0;
 665}
 666
 667static int et61x251_i2c_read(struct et61x251_device* cam, u8 address)
 668{
 669        return et61x251_i2c_try_read(cam, &cam->sensor, address);
 670}
 671
 672static int et61x251_i2c_write(struct et61x251_device* cam,
 673                              u8 address, u8 value)
 674{
 675        return et61x251_i2c_try_write(cam, &cam->sensor, address, value);
 676}
 677
 678static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
 679{
 680        char str[5];
 681        char* endp;
 682        unsigned long val;
 683
 684        if (len < 4) {
 685                strncpy(str, buff, len);
 686                str[len] = '\0';
 687        } else {
 688                strncpy(str, buff, 4);
 689                str[4] = '\0';
 690        }
 691
 692        val = simple_strtoul(str, &endp, 0);
 693
 694        *count = 0;
 695        if (val <= 0xff)
 696                *count = (ssize_t)(endp - str);
 697        if ((*count) && (len == *count+1) && (buff[*count] == '\n'))
 698                *count += 1;
 699
 700        return (u8)val;
 701}
 702
 703/*
 704   NOTE 1: being inside one of the following methods implies that the v4l
 705           device exists for sure (see kobjects and reference counters)
 706   NOTE 2: buffers are PAGE_SIZE long
 707*/
 708
 709static ssize_t et61x251_show_reg(struct device* cd,
 710                                 struct device_attribute *attr, char* buf)
 711{
 712        struct et61x251_device* cam;
 713        ssize_t count;
 714
 715        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 716                return -ERESTARTSYS;
 717
 718        cam = video_get_drvdata(to_video_device(cd));
 719        if (!cam) {
 720                mutex_unlock(&et61x251_sysfs_lock);
 721                return -ENODEV;
 722        }
 723
 724        count = sprintf(buf, "%u\n", cam->sysfs.reg);
 725
 726        mutex_unlock(&et61x251_sysfs_lock);
 727
 728        return count;
 729}
 730
 731
 732static ssize_t
 733et61x251_store_reg(struct device* cd,
 734                   struct device_attribute *attr, const char* buf, size_t len)
 735{
 736        struct et61x251_device* cam;
 737        u8 index;
 738        ssize_t count;
 739
 740        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 741                return -ERESTARTSYS;
 742
 743        cam = video_get_drvdata(to_video_device(cd));
 744        if (!cam) {
 745                mutex_unlock(&et61x251_sysfs_lock);
 746                return -ENODEV;
 747        }
 748
 749        index = et61x251_strtou8(buf, len, &count);
 750        if (index > 0x8e || !count) {
 751                mutex_unlock(&et61x251_sysfs_lock);
 752                return -EINVAL;
 753        }
 754
 755        cam->sysfs.reg = index;
 756
 757        DBG(2, "Moved ET61X[12]51 register index to 0x%02X", cam->sysfs.reg);
 758        DBG(3, "Written bytes: %zd", count);
 759
 760        mutex_unlock(&et61x251_sysfs_lock);
 761
 762        return count;
 763}
 764
 765
 766static ssize_t et61x251_show_val(struct device* cd,
 767                                 struct device_attribute *attr, char* buf)
 768{
 769        struct et61x251_device* cam;
 770        ssize_t count;
 771        int val;
 772
 773        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 774                return -ERESTARTSYS;
 775
 776        cam = video_get_drvdata(to_video_device(cd));
 777        if (!cam) {
 778                mutex_unlock(&et61x251_sysfs_lock);
 779                return -ENODEV;
 780        }
 781
 782        if ((val = et61x251_read_reg(cam, cam->sysfs.reg)) < 0) {
 783                mutex_unlock(&et61x251_sysfs_lock);
 784                return -EIO;
 785        }
 786
 787        count = sprintf(buf, "%d\n", val);
 788
 789        DBG(3, "Read bytes: %zd", count);
 790
 791        mutex_unlock(&et61x251_sysfs_lock);
 792
 793        return count;
 794}
 795
 796
 797static ssize_t
 798et61x251_store_val(struct device* cd, struct device_attribute *attr,
 799                   const char* buf, size_t len)
 800{
 801        struct et61x251_device* cam;
 802        u8 value;
 803        ssize_t count;
 804        int err;
 805
 806        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 807                return -ERESTARTSYS;
 808
 809        cam = video_get_drvdata(to_video_device(cd));
 810        if (!cam) {
 811                mutex_unlock(&et61x251_sysfs_lock);
 812                return -ENODEV;
 813        }
 814
 815        value = et61x251_strtou8(buf, len, &count);
 816        if (!count) {
 817                mutex_unlock(&et61x251_sysfs_lock);
 818                return -EINVAL;
 819        }
 820
 821        err = et61x251_write_reg(cam, value, cam->sysfs.reg);
 822        if (err) {
 823                mutex_unlock(&et61x251_sysfs_lock);
 824                return -EIO;
 825        }
 826
 827        DBG(2, "Written ET61X[12]51 reg. 0x%02X, val. 0x%02X",
 828            cam->sysfs.reg, value);
 829        DBG(3, "Written bytes: %zd", count);
 830
 831        mutex_unlock(&et61x251_sysfs_lock);
 832
 833        return count;
 834}
 835
 836
 837static ssize_t et61x251_show_i2c_reg(struct device* cd,
 838                                     struct device_attribute *attr, char* buf)
 839{
 840        struct et61x251_device* cam;
 841        ssize_t count;
 842
 843        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 844                return -ERESTARTSYS;
 845
 846        cam = video_get_drvdata(to_video_device(cd));
 847        if (!cam) {
 848                mutex_unlock(&et61x251_sysfs_lock);
 849                return -ENODEV;
 850        }
 851
 852        count = sprintf(buf, "%u\n", cam->sysfs.i2c_reg);
 853
 854        DBG(3, "Read bytes: %zd", count);
 855
 856        mutex_unlock(&et61x251_sysfs_lock);
 857
 858        return count;
 859}
 860
 861
 862static ssize_t
 863et61x251_store_i2c_reg(struct device* cd, struct device_attribute *attr,
 864                       const char* buf, size_t len)
 865{
 866        struct et61x251_device* cam;
 867        u8 index;
 868        ssize_t count;
 869
 870        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 871                return -ERESTARTSYS;
 872
 873        cam = video_get_drvdata(to_video_device(cd));
 874        if (!cam) {
 875                mutex_unlock(&et61x251_sysfs_lock);
 876                return -ENODEV;
 877        }
 878
 879        index = et61x251_strtou8(buf, len, &count);
 880        if (!count) {
 881                mutex_unlock(&et61x251_sysfs_lock);
 882                return -EINVAL;
 883        }
 884
 885        cam->sysfs.i2c_reg = index;
 886
 887        DBG(2, "Moved sensor register index to 0x%02X", cam->sysfs.i2c_reg);
 888        DBG(3, "Written bytes: %zd", count);
 889
 890        mutex_unlock(&et61x251_sysfs_lock);
 891
 892        return count;
 893}
 894
 895
 896static ssize_t et61x251_show_i2c_val(struct device* cd,
 897                                     struct device_attribute *attr, char* buf)
 898{
 899        struct et61x251_device* cam;
 900        ssize_t count;
 901        int val;
 902
 903        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 904                return -ERESTARTSYS;
 905
 906        cam = video_get_drvdata(to_video_device(cd));
 907        if (!cam) {
 908                mutex_unlock(&et61x251_sysfs_lock);
 909                return -ENODEV;
 910        }
 911
 912        if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 913                mutex_unlock(&et61x251_sysfs_lock);
 914                return -ENOSYS;
 915        }
 916
 917        if ((val = et61x251_i2c_read(cam, cam->sysfs.i2c_reg)) < 0) {
 918                mutex_unlock(&et61x251_sysfs_lock);
 919                return -EIO;
 920        }
 921
 922        count = sprintf(buf, "%d\n", val);
 923
 924        DBG(3, "Read bytes: %zd", count);
 925
 926        mutex_unlock(&et61x251_sysfs_lock);
 927
 928        return count;
 929}
 930
 931
 932static ssize_t
 933et61x251_store_i2c_val(struct device* cd, struct device_attribute *attr,
 934                       const char* buf, size_t len)
 935{
 936        struct et61x251_device* cam;
 937        u8 value;
 938        ssize_t count;
 939        int err;
 940
 941        if (mutex_lock_interruptible(&et61x251_sysfs_lock))
 942                return -ERESTARTSYS;
 943
 944        cam = video_get_drvdata(to_video_device(cd));
 945        if (!cam) {
 946                mutex_unlock(&et61x251_sysfs_lock);
 947                return -ENODEV;
 948        }
 949
 950        if (!(cam->sensor.sysfs_ops & ET61X251_I2C_READ)) {
 951                mutex_unlock(&et61x251_sysfs_lock);
 952                return -ENOSYS;
 953        }
 954
 955        value = et61x251_strtou8(buf, len, &count);
 956        if (!count) {
 957                mutex_unlock(&et61x251_sysfs_lock);
 958                return -EINVAL;
 959        }
 960
 961        err = et61x251_i2c_write(cam, cam->sysfs.i2c_reg, value);
 962        if (err) {
 963                mutex_unlock(&et61x251_sysfs_lock);
 964                return -EIO;
 965        }
 966
 967        DBG(2, "Written sensor reg. 0x%02X, val. 0x%02X",
 968            cam->sysfs.i2c_reg, value);
 969        DBG(3, "Written bytes: %zd", count);
 970
 971        mutex_unlock(&et61x251_sysfs_lock);
 972
 973        return count;
 974}
 975
 976
 977static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR,
 978                   et61x251_show_reg, et61x251_store_reg);
 979static DEVICE_ATTR(val, S_IRUGO | S_IWUSR,
 980                   et61x251_show_val, et61x251_store_val);
 981static DEVICE_ATTR(i2c_reg, S_IRUGO | S_IWUSR,
 982                   et61x251_show_i2c_reg, et61x251_store_i2c_reg);
 983static DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
 984                   et61x251_show_i2c_val, et61x251_store_i2c_val);
 985
 986
 987static int et61x251_create_sysfs(struct et61x251_device* cam)
 988{
 989        struct device *classdev = &(cam->v4ldev->dev);
 990        int err = 0;
 991
 992        if ((err = device_create_file(classdev, &dev_attr_reg)))
 993                goto err_out;
 994        if ((err = device_create_file(classdev, &dev_attr_val)))
 995                goto err_reg;
 996
 997        if (cam->sensor.sysfs_ops) {
 998                if ((err = device_create_file(classdev, &dev_attr_i2c_reg)))
 999                        goto err_val;
1000                if ((err = device_create_file(classdev, &dev_attr_i2c_val)))
1001                        goto err_i2c_reg;
1002        }
1003
1004err_i2c_reg:
1005        if (cam->sensor.sysfs_ops)
1006                device_remove_file(classdev, &dev_attr_i2c_reg);
1007err_val:
1008        device_remove_file(classdev, &dev_attr_val);
1009err_reg:
1010        device_remove_file(classdev, &dev_attr_reg);
1011err_out:
1012        return err;
1013}
1014#endif /* CONFIG_VIDEO_ADV_DEBUG */
1015
1016/*****************************************************************************/
1017
1018static int
1019et61x251_set_pix_format(struct et61x251_device* cam,
1020                        struct v4l2_pix_format* pix)
1021{
1022        int r, err = 0;
1023
1024        if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1025                err += r;
1026        if (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
1027                err += et61x251_write_reg(cam, r & 0xfd, 0x12);
1028        else
1029                err += et61x251_write_reg(cam, r | 0x02, 0x12);
1030
1031        return err ? -EIO : 0;
1032}
1033
1034
1035static int
1036et61x251_set_compression(struct et61x251_device* cam,
1037                         struct v4l2_jpegcompression* compression)
1038{
1039        int r, err = 0;
1040
1041        if ((r = et61x251_read_reg(cam, 0x12)) < 0)
1042                err += r;
1043        if (compression->quality == 0)
1044                err += et61x251_write_reg(cam, r & 0xfb, 0x12);
1045        else
1046                err += et61x251_write_reg(cam, r | 0x04, 0x12);
1047
1048        return err ? -EIO : 0;
1049}
1050
1051
1052static int et61x251_set_scale(struct et61x251_device* cam, u8 scale)
1053{
1054        int r = 0, err = 0;
1055
1056        r = et61x251_read_reg(cam, 0x12);
1057        if (r < 0)
1058                err += r;
1059
1060        if (scale == 1)
1061                err += et61x251_write_reg(cam, r & ~0x01, 0x12);
1062        else if (scale == 2)
1063                err += et61x251_write_reg(cam, r | 0x01, 0x12);
1064
1065        if (err)
1066                return -EIO;
1067
1068        PDBGG("Scaling factor: %u", scale);
1069
1070        return 0;
1071}
1072
1073
1074static int
1075et61x251_set_crop(struct et61x251_device* cam, struct v4l2_rect* rect)
1076{
1077        struct et61x251_sensor* s = &cam->sensor;
1078        u16 fmw_sx = (u16)(rect->left - s->cropcap.bounds.left +
1079                           s->active_pixel.left),
1080            fmw_sy = (u16)(rect->top - s->cropcap.bounds.top +
1081                           s->active_pixel.top),
1082            fmw_length = (u16)(rect->width),
1083            fmw_height = (u16)(rect->height);
1084        int err = 0;
1085
1086        err += et61x251_write_reg(cam, fmw_sx & 0xff, 0x69);
1087        err += et61x251_write_reg(cam, fmw_sy & 0xff, 0x6a);
1088        err += et61x251_write_reg(cam, fmw_length & 0xff, 0x6b);
1089        err += et61x251_write_reg(cam, fmw_height & 0xff, 0x6c);
1090        err += et61x251_write_reg(cam, (fmw_sx >> 8) | ((fmw_sy & 0x300) >> 6)
1091                                       | ((fmw_length & 0x300) >> 4)
1092                                       | ((fmw_height & 0x300) >> 2), 0x6d);
1093        if (err)
1094                return -EIO;
1095
1096        PDBGG("fmw_sx, fmw_sy, fmw_length, fmw_height: %u %u %u %u",
1097              fmw_sx, fmw_sy, fmw_length, fmw_height);
1098
1099        return 0;
1100}
1101
1102
1103static int et61x251_init(struct et61x251_device* cam)
1104{
1105        struct et61x251_sensor* s = &cam->sensor;
1106        struct v4l2_control ctrl;
1107        struct v4l2_queryctrl *qctrl;
1108        struct v4l2_rect* rect;
1109        u8 i = 0;
1110        int err = 0;
1111
1112        if (!(cam->state & DEV_INITIALIZED)) {
1113                mutex_init(&cam->open_mutex);
1114                init_waitqueue_head(&cam->wait_open);
1115                qctrl = s->qctrl;
1116                rect = &(s->cropcap.defrect);
1117                cam->compression.quality = ET61X251_COMPRESSION_QUALITY;
1118        } else { /* use current values */
1119                qctrl = s->_qctrl;
1120                rect = &(s->_rect);
1121        }
1122
1123        err += et61x251_set_scale(cam, rect->width / s->pix_format.width);
1124        err += et61x251_set_crop(cam, rect);
1125        if (err)
1126                return err;
1127
1128        if (s->init) {
1129                err = s->init(cam);
1130                if (err) {
1131                        DBG(3, "Sensor initialization failed");
1132                        return err;
1133                }
1134        }
1135
1136        err += et61x251_set_compression(cam, &cam->compression);
1137        err += et61x251_set_pix_format(cam, &s->pix_format);
1138        if (s->set_pix_format)
1139                err += s->set_pix_format(cam, &s->pix_format);
1140        if (err)
1141                return err;
1142
1143        if (s->pix_format.pixelformat == V4L2_PIX_FMT_ET61X251)
1144                DBG(3, "Compressed video format is active, quality %d",
1145                    cam->compression.quality);
1146        else
1147                DBG(3, "Uncompressed video format is active");
1148
1149        if (s->set_crop)
1150                if ((err = s->set_crop(cam, rect))) {
1151                        DBG(3, "set_crop() failed");
1152                        return err;
1153                }
1154
1155        if (s->set_ctrl) {
1156                for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1157                        if (s->qctrl[i].id != 0 &&
1158                            !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) {
1159                                ctrl.id = s->qctrl[i].id;
1160                                ctrl.value = qctrl[i].default_value;
1161                                err = s->set_ctrl(cam, &ctrl);
1162                                if (err) {
1163                                        DBG(3, "Set %s control failed",
1164                                            s->qctrl[i].name);
1165                                        return err;
1166                                }
1167                                DBG(3, "Image sensor supports '%s' control",
1168                                    s->qctrl[i].name);
1169                        }
1170        }
1171
1172        if (!(cam->state & DEV_INITIALIZED)) {
1173                mutex_init(&cam->fileop_mutex);
1174                spin_lock_init(&cam->queue_lock);
1175                init_waitqueue_head(&cam->wait_frame);
1176                init_waitqueue_head(&cam->wait_stream);
1177                cam->nreadbuffers = 2;
1178                memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl));
1179                memcpy(&(s->_rect), &(s->cropcap.defrect),
1180                       sizeof(struct v4l2_rect));
1181                cam->state |= DEV_INITIALIZED;
1182        }
1183
1184        DBG(2, "Initialization succeeded");
1185        return 0;
1186}
1187
1188/*****************************************************************************/
1189
1190static void et61x251_release_resources(struct kref *kref)
1191{
1192        struct et61x251_device *cam;
1193
1194        mutex_lock(&et61x251_sysfs_lock);
1195
1196        cam = container_of(kref, struct et61x251_device, kref);
1197
1198        DBG(2, "V4L2 device %s deregistered",
1199            video_device_node_name(cam->v4ldev));
1200        video_set_drvdata(cam->v4ldev, NULL);
1201        video_unregister_device(cam->v4ldev);
1202        usb_put_dev(cam->usbdev);
1203        kfree(cam->control_buffer);
1204        kfree(cam);
1205
1206        mutex_unlock(&et61x251_sysfs_lock);
1207}
1208
1209
1210static int et61x251_open(struct file *filp)
1211{
1212        struct et61x251_device* cam;
1213        int err = 0;
1214
1215        if (!down_read_trylock(&et61x251_dev_lock))
1216                return -ERESTARTSYS;
1217
1218        cam = video_drvdata(filp);
1219
1220        if (wait_for_completion_interruptible(&cam->probe)) {
1221                up_read(&et61x251_dev_lock);
1222                return -ERESTARTSYS;
1223        }
1224
1225        kref_get(&cam->kref);
1226
1227        if (mutex_lock_interruptible(&cam->open_mutex)) {
1228                kref_put(&cam->kref, et61x251_release_resources);
1229                up_read(&et61x251_dev_lock);
1230                return -ERESTARTSYS;
1231        }
1232
1233        if (cam->state & DEV_DISCONNECTED) {
1234                DBG(1, "Device not present");
1235                err = -ENODEV;
1236                goto out;
1237        }
1238
1239        if (cam->users) {
1240                DBG(2, "Device %s is already in use",
1241                       video_device_node_name(cam->v4ldev));
1242                DBG(3, "Simultaneous opens are not supported");
1243                if ((filp->f_flags & O_NONBLOCK) ||
1244                    (filp->f_flags & O_NDELAY)) {
1245                        err = -EWOULDBLOCK;
1246                        goto out;
1247                }
1248                DBG(2, "A blocking open() has been requested. Wait for the "
1249                       "device to be released...");
1250                up_read(&et61x251_dev_lock);
1251                err = wait_event_interruptible_exclusive(cam->wait_open,
1252                                                (cam->state & DEV_DISCONNECTED)
1253                                                         || !cam->users);
1254                down_read(&et61x251_dev_lock);
1255                if (err)
1256                        goto out;
1257                if (cam->state & DEV_DISCONNECTED) {
1258                        err = -ENODEV;
1259                        goto out;
1260                }
1261        }
1262
1263        if (cam->state & DEV_MISCONFIGURED) {
1264                err = et61x251_init(cam);
1265                if (err) {
1266                        DBG(1, "Initialization failed again. "
1267                               "I will retry on next open().");
1268                        goto out;
1269                }
1270                cam->state &= ~DEV_MISCONFIGURED;
1271        }
1272
1273        if ((err = et61x251_start_transfer(cam)))
1274                goto out;
1275
1276        filp->private_data = cam;
1277        cam->users++;
1278        cam->io = IO_NONE;
1279        cam->stream = STREAM_OFF;
1280        cam->nbuffers = 0;
1281        cam->frame_count = 0;
1282        et61x251_empty_framequeues(cam);
1283
1284        DBG(3, "Video device %s is open",
1285            video_device_node_name(cam->v4ldev));
1286
1287out:
1288        mutex_unlock(&cam->open_mutex);
1289        if (err)
1290                kref_put(&cam->kref, et61x251_release_resources);
1291        up_read(&et61x251_dev_lock);
1292        return err;
1293}
1294
1295
1296static int et61x251_release(struct file *filp)
1297{
1298        struct et61x251_device* cam;
1299
1300        down_write(&et61x251_dev_lock);
1301
1302        cam = video_drvdata(filp);
1303
1304        et61x251_stop_transfer(cam);
1305        et61x251_release_buffers(cam);
1306        cam->users--;
1307        wake_up_interruptible_nr(&cam->wait_open, 1);
1308
1309        DBG(3, "Video device %s closed",
1310            video_device_node_name(cam->v4ldev));
1311
1312        kref_put(&cam->kref, et61x251_release_resources);
1313
1314        up_write(&et61x251_dev_lock);
1315
1316        return 0;
1317}
1318
1319
1320static ssize_t
1321et61x251_read(struct file* filp, char __user * buf,
1322              size_t count, loff_t* f_pos)
1323{
1324        struct et61x251_device *cam = video_drvdata(filp);
1325        struct et61x251_frame_t* f, * i;
1326        unsigned long lock_flags;
1327        long timeout;
1328        int err = 0;
1329
1330        if (mutex_lock_interruptible(&cam->fileop_mutex))
1331                return -ERESTARTSYS;
1332
1333        if (cam->state & DEV_DISCONNECTED) {
1334                DBG(1, "Device not present");
1335                mutex_unlock(&cam->fileop_mutex);
1336                return -ENODEV;
1337        }
1338
1339        if (cam->state & DEV_MISCONFIGURED) {
1340                DBG(1, "The camera is misconfigured. Close and open it "
1341                       "again.");
1342                mutex_unlock(&cam->fileop_mutex);
1343                return -EIO;
1344        }
1345
1346        if (cam->io == IO_MMAP) {
1347                DBG(3, "Close and open the device again to choose the read "
1348                       "method");
1349                mutex_unlock(&cam->fileop_mutex);
1350                return -EBUSY;
1351        }
1352
1353        if (cam->io == IO_NONE) {
1354                if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1355                                              IO_READ)) {
1356                        DBG(1, "read() failed, not enough memory");
1357                        mutex_unlock(&cam->fileop_mutex);
1358                        return -ENOMEM;
1359                }
1360                cam->io = IO_READ;
1361                cam->stream = STREAM_ON;
1362        }
1363
1364        if (list_empty(&cam->inqueue)) {
1365                if (!list_empty(&cam->outqueue))
1366                        et61x251_empty_framequeues(cam);
1367                et61x251_queue_unusedframes(cam);
1368        }
1369
1370        if (!count) {
1371                mutex_unlock(&cam->fileop_mutex);
1372                return 0;
1373        }
1374
1375        if (list_empty(&cam->outqueue)) {
1376                if (filp->f_flags & O_NONBLOCK) {
1377                        mutex_unlock(&cam->fileop_mutex);
1378                        return -EAGAIN;
1379                }
1380                timeout = wait_event_interruptible_timeout
1381                          ( cam->wait_frame,
1382                            (!list_empty(&cam->outqueue)) ||
1383                            (cam->state & DEV_DISCONNECTED) ||
1384                            (cam->state & DEV_MISCONFIGURED),
1385                            msecs_to_jiffies(
1386                                cam->module_param.frame_timeout * 1000
1387                            )
1388                          );
1389                if (timeout < 0) {
1390                        mutex_unlock(&cam->fileop_mutex);
1391                        return timeout;
1392                }
1393                if (cam->state & DEV_DISCONNECTED) {
1394                        mutex_unlock(&cam->fileop_mutex);
1395                        return -ENODEV;
1396                }
1397                if (!timeout || (cam->state & DEV_MISCONFIGURED)) {
1398                        mutex_unlock(&cam->fileop_mutex);
1399                        return -EIO;
1400                }
1401        }
1402
1403        f = list_entry(cam->outqueue.prev, struct et61x251_frame_t, frame);
1404
1405        if (count > f->buf.bytesused)
1406                count = f->buf.bytesused;
1407
1408        if (copy_to_user(buf, f->bufmem, count)) {
1409                err = -EFAULT;
1410                goto exit;
1411        }
1412        *f_pos += count;
1413
1414exit:
1415        spin_lock_irqsave(&cam->queue_lock, lock_flags);
1416        list_for_each_entry(i, &cam->outqueue, frame)
1417                i->state = F_UNUSED;
1418        INIT_LIST_HEAD(&cam->outqueue);
1419        spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1420
1421        et61x251_queue_unusedframes(cam);
1422
1423        PDBGG("Frame #%lu, bytes read: %zu",
1424              (unsigned long)f->buf.index, count);
1425
1426        mutex_unlock(&cam->fileop_mutex);
1427
1428        return err ? err : count;
1429}
1430
1431
1432static unsigned int et61x251_poll(struct file *filp, poll_table *wait)
1433{
1434        struct et61x251_device *cam = video_drvdata(filp);
1435        struct et61x251_frame_t* f;
1436        unsigned long lock_flags;
1437        unsigned int mask = 0;
1438
1439        if (mutex_lock_interruptible(&cam->fileop_mutex))
1440                return POLLERR;
1441
1442        if (cam->state & DEV_DISCONNECTED) {
1443                DBG(1, "Device not present");
1444                goto error;
1445        }
1446
1447        if (cam->state & DEV_MISCONFIGURED) {
1448                DBG(1, "The camera is misconfigured. Close and open it "
1449                       "again.");
1450                goto error;
1451        }
1452
1453        if (cam->io == IO_NONE) {
1454                if (!et61x251_request_buffers(cam, cam->nreadbuffers,
1455                                              IO_READ)) {
1456                        DBG(1, "poll() failed, not enough memory");
1457                        goto error;
1458                }
1459                cam->io = IO_READ;
1460                cam->stream = STREAM_ON;
1461        }
1462
1463        if (cam->io == IO_READ) {
1464                spin_lock_irqsave(&cam->queue_lock, lock_flags);
1465                list_for_each_entry(f, &cam->outqueue, frame)
1466                        f->state = F_UNUSED;
1467                INIT_LIST_HEAD(&cam->outqueue);
1468                spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
1469                et61x251_queue_unusedframes(cam);
1470        }
1471
1472        poll_wait(filp, &cam->wait_frame, wait);
1473
1474        if (!list_empty(&cam->outqueue))
1475                mask |= POLLIN | POLLRDNORM;
1476
1477        mutex_unlock(&cam->fileop_mutex);
1478
1479        return mask;
1480
1481error:
1482        mutex_unlock(&cam->fileop_mutex);
1483        return POLLERR;
1484}
1485
1486
1487static void et61x251_vm_open(struct vm_area_struct* vma)
1488{
1489        struct et61x251_frame_t* f = vma->vm_private_data;
1490        f->vma_use_count++;
1491}
1492
1493
1494static void et61x251_vm_close(struct vm_area_struct* vma)
1495{
1496        /* NOTE: buffers are not freed here */
1497        struct et61x251_frame_t* f = vma->vm_private_data;
1498        f->vma_use_count--;
1499}
1500
1501
1502static const struct vm_operations_struct et61x251_vm_ops = {
1503        .open = et61x251_vm_open,
1504        .close = et61x251_vm_close,
1505};
1506
1507
1508static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
1509{
1510        struct et61x251_device *cam = video_drvdata(filp);
1511        unsigned long size = vma->vm_end - vma->vm_start,
1512                      start = vma->vm_start;
1513        void *pos;
1514        u32 i;
1515
1516        if (mutex_lock_interruptible(&cam->fileop_mutex))
1517                return -ERESTARTSYS;
1518
1519        if (cam->state & DEV_DISCONNECTED) {
1520                DBG(1, "Device not present");
1521                mutex_unlock(&cam->fileop_mutex);
1522                return -ENODEV;
1523        }
1524
1525        if (cam->state & DEV_MISCONFIGURED) {
1526                DBG(1, "The camera is misconfigured. Close and open it "
1527                       "again.");
1528                mutex_unlock(&cam->fileop_mutex);
1529                return -EIO;
1530        }
1531
1532        if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
1533                mutex_unlock(&cam->fileop_mutex);
1534                return -EACCES;
1535        }
1536
1537        if (cam->io != IO_MMAP ||
1538            size != PAGE_ALIGN(cam->frame[0].buf.length)) {
1539                mutex_unlock(&cam->fileop_mutex);
1540                return -EINVAL;
1541        }
1542
1543        for (i = 0; i < cam->nbuffers; i++) {
1544                if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff)
1545                        break;
1546        }
1547        if (i == cam->nbuffers) {
1548                mutex_unlock(&cam->fileop_mutex);
1549                return -EINVAL;
1550        }
1551
1552        vma->vm_flags |= VM_IO;
1553        vma->vm_flags |= VM_RESERVED;
1554
1555        pos = cam->frame[i].bufmem;
1556        while (size > 0) { /* size is page-aligned */
1557                if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
1558                        mutex_unlock(&cam->fileop_mutex);
1559                        return -EAGAIN;
1560                }
1561                start += PAGE_SIZE;
1562                pos += PAGE_SIZE;
1563                size -= PAGE_SIZE;
1564        }
1565
1566        vma->vm_ops = &et61x251_vm_ops;
1567        vma->vm_private_data = &cam->frame[i];
1568        et61x251_vm_open(vma);
1569
1570        mutex_unlock(&cam->fileop_mutex);
1571
1572        return 0;
1573}
1574
1575/*****************************************************************************/
1576
1577static int
1578et61x251_vidioc_querycap(struct et61x251_device* cam, void __user * arg)
1579{
1580        struct v4l2_capability cap = {
1581                .driver = "et61x251",
1582                .version = ET61X251_MODULE_VERSION_CODE,
1583                .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
1584                                V4L2_CAP_STREAMING,
1585        };
1586
1587        strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card));
1588        if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0)
1589                strlcpy(cap.bus_info, dev_name(&cam->usbdev->dev),
1590                        sizeof(cap.bus_info));
1591
1592        if (copy_to_user(arg, &cap, sizeof(cap)))
1593                return -EFAULT;
1594
1595        return 0;
1596}
1597
1598
1599static int
1600et61x251_vidioc_enuminput(struct et61x251_device* cam, void __user * arg)
1601{
1602        struct v4l2_input i;
1603
1604        if (copy_from_user(&i, arg, sizeof(i)))
1605                return -EFAULT;
1606
1607        if (i.index)
1608                return -EINVAL;
1609
1610        memset(&i, 0, sizeof(i));
1611        strcpy(i.name, "Camera");
1612        i.type = V4L2_INPUT_TYPE_CAMERA;
1613
1614        if (copy_to_user(arg, &i, sizeof(i)))
1615                return -EFAULT;
1616
1617        return 0;
1618}
1619
1620
1621static int
1622et61x251_vidioc_g_input(struct et61x251_device* cam, void __user * arg)
1623{
1624        int index = 0;
1625
1626        if (copy_to_user(arg, &index, sizeof(index)))
1627                return -EFAULT;
1628
1629        return 0;
1630}
1631
1632
1633static int
1634et61x251_vidioc_s_input(struct et61x251_device* cam, void __user * arg)
1635{
1636        int index;
1637
1638        if (copy_from_user(&index, arg, sizeof(index)))
1639                return -EFAULT;
1640
1641        if (index != 0)
1642                return -EINVAL;
1643
1644        return 0;
1645}
1646
1647
1648static int
1649et61x251_vidioc_query_ctrl(struct et61x251_device* cam, void __user * arg)
1650{
1651        struct et61x251_sensor* s = &cam->sensor;
1652        struct v4l2_queryctrl qc;
1653        u8 i;
1654
1655        if (copy_from_user(&qc, arg, sizeof(qc)))
1656                return -EFAULT;
1657
1658        for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1659                if (qc.id && qc.id == s->qctrl[i].id) {
1660                        memcpy(&qc, &(s->qctrl[i]), sizeof(qc));
1661                        if (copy_to_user(arg, &qc, sizeof(qc)))
1662                                return -EFAULT;
1663                        return 0;
1664                }
1665
1666        return -EINVAL;
1667}
1668
1669
1670static int
1671et61x251_vidioc_g_ctrl(struct et61x251_device* cam, void __user * arg)
1672{
1673        struct et61x251_sensor* s = &cam->sensor;
1674        struct v4l2_control ctrl;
1675        int err = 0;
1676        u8 i;
1677
1678        if (!s->get_ctrl && !s->set_ctrl)
1679                return -EINVAL;
1680
1681        if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1682                return -EFAULT;
1683
1684        if (!s->get_ctrl) {
1685                for (i = 0; i < ARRAY_SIZE(s->qctrl); i++)
1686                        if (ctrl.id == s->qctrl[i].id) {
1687                                ctrl.value = s->_qctrl[i].default_value;
1688                                goto exit;
1689                        }
1690                return -EINVAL;
1691        } else
1692                err = s->get_ctrl(cam, &ctrl);
1693
1694exit:
1695        if (copy_to_user(arg, &ctrl, sizeof(ctrl)))
1696                return -EFAULT;
1697
1698        return err;
1699}
1700
1701
1702static int
1703et61x251_vidioc_s_ctrl(struct et61x251_device* cam, void __user * arg)
1704{
1705        struct et61x251_sensor* s = &cam->sensor;
1706        struct v4l2_control ctrl;
1707        u8 i;
1708        int err = 0;
1709
1710        if (!s->set_ctrl)
1711                return -EINVAL;
1712
1713        if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1714                return -EFAULT;
1715
1716        for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) {
1717                if (ctrl.id == s->qctrl[i].id) {
1718                        if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)
1719                                return -EINVAL;
1720                        if (ctrl.value < s->qctrl[i].minimum ||
1721                            ctrl.value > s->qctrl[i].maximum)
1722                                return -ERANGE;
1723                        ctrl.value -= ctrl.value % s->qctrl[i].step;
1724                        break;
1725                }
1726        }
1727        if (i == ARRAY_SIZE(s->qctrl))
1728                return -EINVAL;
1729        if ((err = s->set_ctrl(cam, &ctrl)))
1730                return err;
1731
1732        s->_qctrl[i].default_value = ctrl.value;
1733
1734        return 0;
1735}
1736
1737
1738static int
1739et61x251_vidioc_cropcap(struct et61x251_device* cam, void __user * arg)
1740{
1741        struct v4l2_cropcap* cc = &(cam->sensor.cropcap);
1742
1743        cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1744        cc->pixelaspect.numerator = 1;
1745        cc->pixelaspect.denominator = 1;
1746
1747        if (copy_to_user(arg, cc, sizeof(*cc)))
1748                return -EFAULT;
1749
1750        return 0;
1751}
1752
1753
1754static int
1755et61x251_vidioc_g_crop(struct et61x251_device* cam, void __user * arg)
1756{
1757        struct et61x251_sensor* s = &cam->sensor;
1758        struct v4l2_crop crop = {
1759                .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1760        };
1761
1762        memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect));
1763
1764        if (copy_to_user(arg, &crop, sizeof(crop)))
1765                return -EFAULT;
1766
1767        return 0;
1768}
1769
1770
1771static int
1772et61x251_vidioc_s_crop(struct et61x251_device* cam, void __user * arg)
1773{
1774        struct et61x251_sensor* s = &cam->sensor;
1775        struct v4l2_crop crop;
1776        struct v4l2_rect* rect;
1777        struct v4l2_rect* bounds = &(s->cropcap.bounds);
1778        struct v4l2_pix_format* pix_format = &(s->pix_format);
1779        u8 scale;
1780        const enum et61x251_stream_state stream = cam->stream;
1781        const u32 nbuffers = cam->nbuffers;
1782        u32 i;
1783        int err = 0;
1784
1785        if (copy_from_user(&crop, arg, sizeof(crop)))
1786                return -EFAULT;
1787
1788        rect = &(crop.c);
1789
1790        if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1791                return -EINVAL;
1792
1793        if (cam->module_param.force_munmap)
1794                for (i = 0; i < cam->nbuffers; i++)
1795                        if (cam->frame[i].vma_use_count) {
1796                                DBG(3, "VIDIOC_S_CROP failed. "
1797                                       "Unmap the buffers first.");
1798                                return -EBUSY;
1799                        }
1800
1801        /* Preserve R,G or B origin */
1802        rect->left = (s->_rect.left & 1L) ? rect->left | 1L : rect->left & ~1L;
1803        rect->top = (s->_rect.top & 1L) ? rect->top | 1L : rect->top & ~1L;
1804
1805        if (rect->width < 16)
1806                rect->width = 16;
1807        if (rect->height < 16)
1808                rect->height = 16;
1809        if (rect->width > bounds->width)
1810                rect->width = bounds->width;
1811        if (rect->height > bounds->height)
1812                rect->height = bounds->height;
1813        if (rect->left < bounds->left)
1814                rect->left = bounds->left;
1815        if (rect->top < bounds->top)
1816                rect->top = bounds->top;
1817        if (rect->left + rect->width > bounds->left + bounds->width)
1818                rect->left = bounds->left+bounds->width - rect->width;
1819        if (rect->top + rect->height > bounds->top + bounds->height)
1820                rect->top = bounds->top+bounds->height - rect->height;
1821
1822        rect->width &= ~15L;
1823        rect->height &= ~15L;
1824
1825        if (ET61X251_PRESERVE_IMGSCALE) {
1826                /* Calculate the actual scaling factor */
1827                u32 a, b;
1828                a = rect->width * rect->height;
1829                b = pix_format->width * pix_format->height;
1830                scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
1831        } else
1832                scale = 1;
1833
1834        if (cam->stream == STREAM_ON)
1835                if ((err = et61x251_stream_interrupt(cam)))
1836                        return err;
1837
1838        if (copy_to_user(arg, &crop, sizeof(crop))) {
1839                cam->stream = stream;
1840                return -EFAULT;
1841        }
1842
1843        if (cam->module_param.force_munmap || cam->io == IO_READ)
1844                et61x251_release_buffers(cam);
1845
1846        err = et61x251_set_crop(cam, rect);
1847        if (s->set_crop)
1848                err += s->set_crop(cam, rect);
1849        err += et61x251_set_scale(cam, scale);
1850
1851        if (err) { /* atomic, no rollback in ioctl() */
1852                cam->state |= DEV_MISCONFIGURED;
1853                DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To "
1854                       "use the camera, close and open %s again.",
1855                    video_device_node_name(cam->v4ldev));
1856                return -EIO;
1857        }
1858
1859        s->pix_format.width = rect->width/scale;
1860        s->pix_format.height = rect->height/scale;
1861        memcpy(&(s->_rect), rect, sizeof(*rect));
1862
1863        if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
1864            nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
1865                cam->state |= DEV_MISCONFIGURED;
1866                DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To "
1867                       "use the camera, close and open %s again.",
1868                    video_device_node_name(cam->v4ldev));
1869                return -ENOMEM;
1870        }
1871
1872        if (cam->io == IO_READ)
1873                et61x251_empty_framequeues(cam);
1874        else if (cam->module_param.force_munmap)
1875                et61x251_requeue_outqueue(cam);
1876
1877        cam->stream = stream;
1878
1879        return 0;
1880}
1881
1882
1883static int
1884et61x251_vidioc_enum_framesizes(struct et61x251_device* cam, void __user * arg)
1885{
1886        struct v4l2_frmsizeenum frmsize;
1887
1888        if (copy_from_user(&frmsize, arg, sizeof(frmsize)))
1889                return -EFAULT;
1890
1891        if (frmsize.index != 0)
1892                return -EINVAL;
1893
1894        if (frmsize.pixel_format != V4L2_PIX_FMT_ET61X251 &&
1895            frmsize.pixel_format != V4L2_PIX_FMT_SBGGR8)
1896                return -EINVAL;
1897
1898        frmsize.type = V4L2_FRMSIZE_TYPE_STEPWISE;
1899        frmsize.stepwise.min_width = frmsize.stepwise.step_width = 16;
1900        frmsize.stepwise.min_height = frmsize.stepwise.step_height = 16;
1901        frmsize.stepwise.max_width = cam->sensor.cropcap.bounds.width;
1902        frmsize.stepwise.max_height = cam->sensor.cropcap.bounds.height;
1903        memset(&frmsize.reserved, 0, sizeof(frmsize.reserved));
1904
1905        if (copy_to_user(arg, &frmsize, sizeof(frmsize)))
1906                return -EFAULT;
1907
1908        return 0;
1909}
1910
1911
1912static int
1913et61x251_vidioc_enum_fmt(struct et61x251_device* cam, void __user * arg)
1914{
1915        struct v4l2_fmtdesc fmtd;
1916
1917        if (copy_from_user(&fmtd, arg, sizeof(fmtd)))
1918                return -EFAULT;
1919
1920        if (fmtd.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1921                return -EINVAL;
1922
1923        if (fmtd.index == 0) {
1924                strcpy(fmtd.description, "bayer rgb");
1925                fmtd.pixelformat = V4L2_PIX_FMT_SBGGR8;
1926        } else if (fmtd.index == 1) {
1927                strcpy(fmtd.description, "compressed");
1928                fmtd.pixelformat = V4L2_PIX_FMT_ET61X251;
1929                fmtd.flags = V4L2_FMT_FLAG_COMPRESSED;
1930        } else
1931                return -EINVAL;
1932
1933        fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1934        memset(&fmtd.reserved, 0, sizeof(fmtd.reserved));
1935
1936        if (copy_to_user(arg, &fmtd, sizeof(fmtd)))
1937                return -EFAULT;
1938
1939        return 0;
1940}
1941
1942
1943static int
1944et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
1945{
1946        struct v4l2_format format;
1947        struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format);
1948
1949        if (copy_from_user(&format, arg, sizeof(format)))
1950                return -EFAULT;
1951
1952        if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1953                return -EINVAL;
1954
1955        pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_ET61X251) ?
1956                           0 : V4L2_COLORSPACE_SRGB;
1957        pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
1958                             ? 0 : (pfmt->width * pfmt->priv) / 8;
1959        pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
1960        pfmt->field = V4L2_FIELD_NONE;
1961        memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt));
1962
1963        if (copy_to_user(arg, &format, sizeof(format)))
1964                return -EFAULT;
1965
1966        return 0;
1967}
1968
1969
1970static int
1971et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
1972                          void __user * arg)
1973{
1974        struct et61x251_sensor* s = &cam->sensor;
1975        struct v4l2_format format;
1976        struct v4l2_pix_format* pix;
1977        struct v4l2_pix_format* pfmt = &(s->pix_format);
1978        struct v4l2_rect* bounds = &(s->cropcap.bounds);
1979        struct v4l2_rect rect;
1980        u8 scale;
1981        const enum et61x251_stream_state stream = cam->stream;
1982        const u32 nbuffers = cam->nbuffers;
1983        u32 i;
1984        int err = 0;
1985
1986        if (copy_from_user(&format, arg, sizeof(format)))
1987                return -EFAULT;
1988
1989        pix = &(format.fmt.pix);
1990
1991        if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1992                return -EINVAL;
1993
1994        memcpy(&rect, &(s->_rect), sizeof(rect));
1995
1996        { /* calculate the actual scaling factor */
1997                u32 a, b;
1998                a = rect.width * rect.height;
1999                b = pix->width * pix->height;
2000                scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
2001        }
2002
2003        rect.width = scale * pix->width;
2004        rect.height = scale * pix->height;
2005
2006        if (rect.width < 16)
2007                rect.width = 16;
2008        if (rect.height < 16)
2009                rect.height = 16;
2010        if (rect.width > bounds->left + bounds->width - rect.left)
2011                rect.width = bounds->left + bounds->width - rect.left;
2012        if (rect.height > bounds->top + bounds->height - rect.top)
2013                rect.height = bounds->top + bounds->height - rect.top;
2014
2015        rect.width &= ~15L;
2016        rect.height &= ~15L;
2017
2018        { /* adjust the scaling factor */
2019                u32 a, b;
2020                a = rect.width * rect.height;
2021                b = pix->width * pix->height;
2022                scale = b ? (u8)((a / b) < 4 ? 1 : 2) : 1;
2023        }
2024
2025        pix->width = rect.width / scale;
2026        pix->height = rect.height / scale;
2027
2028        if (pix->pixelformat != V4L2_PIX_FMT_ET61X251 &&
2029            pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
2030                pix->pixelformat = pfmt->pixelformat;
2031        pix->priv = pfmt->priv; /* bpp */
2032        pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_ET61X251) ?
2033                          0 : V4L2_COLORSPACE_SRGB;
2034        pix->colorspace = pfmt->colorspace;
2035        pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
2036                            ? 0 : (pix->width * pix->priv) / 8;
2037        pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8);
2038        pix->field = V4L2_FIELD_NONE;
2039
2040        if (cmd == VIDIOC_TRY_FMT) {
2041                if (copy_to_user(arg, &format, sizeof(format)))
2042                        return -EFAULT;
2043                return 0;
2044        }
2045
2046        if (cam->module_param.force_munmap)
2047                for (i = 0; i < cam->nbuffers; i++)
2048                        if (cam->frame[i].vma_use_count) {
2049                                DBG(3, "VIDIOC_S_FMT failed. "
2050                                       "Unmap the buffers first.");
2051                                return -EBUSY;
2052                        }
2053
2054        if (cam->stream == STREAM_ON)
2055                if ((err = et61x251_stream_interrupt(cam)))
2056                        return err;
2057
2058        if (copy_to_user(arg, &format, sizeof(format))) {
2059                cam->stream = stream;
2060                return -EFAULT;
2061        }
2062
2063        if (cam->module_param.force_munmap || cam->io == IO_READ)
2064                et61x251_release_buffers(cam);
2065
2066        err += et61x251_set_pix_format(cam, pix);
2067        err += et61x251_set_crop(cam, &rect);
2068        if (s->set_pix_format)
2069                err += s->set_pix_format(cam, pix);
2070        if (s->set_crop)
2071                err += s->set_crop(cam, &rect);
2072        err += et61x251_set_scale(cam, scale);
2073
2074        if (err) { /* atomic, no rollback in ioctl() */
2075                cam->state |= DEV_MISCONFIGURED;
2076                DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To "
2077                       "use the camera, close and open %s again.",
2078                    video_device_node_name(cam->v4ldev));
2079                return -EIO;
2080        }
2081
2082        memcpy(pfmt, pix, sizeof(*pix));
2083        memcpy(&(s->_rect), &rect, sizeof(rect));
2084
2085        if ((cam->module_param.force_munmap  || cam->io == IO_READ) &&
2086            nbuffers != et61x251_request_buffers(cam, nbuffers, cam->io)) {
2087                cam->state |= DEV_MISCONFIGURED;
2088                DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To "
2089                       "use the camera, close and open %s again.",
2090                    video_device_node_name(cam->v4ldev));
2091                return -ENOMEM;
2092        }
2093
2094        if (cam->io == IO_READ)
2095                et61x251_empty_framequeues(cam);
2096        else if (cam->module_param.force_munmap)
2097                et61x251_requeue_outqueue(cam);
2098
2099        cam->stream = stream;
2100
2101        return 0;
2102}
2103
2104
2105static int
2106et61x251_vidioc_g_jpegcomp(struct et61x251_device* cam, void __user * arg)
2107{
2108        if (copy_to_user(arg, &cam->compression,
2109                         sizeof(cam->compression)))
2110                return -EFAULT;
2111
2112        return 0;
2113}
2114
2115
2116static int
2117et61x251_vidioc_s_jpegcomp(struct et61x251_device* cam, void __user * arg)
2118{
2119        struct v4l2_jpegcompression jc;
2120        const enum et61x251_stream_state stream = cam->stream;
2121        int err = 0;
2122
2123        if (copy_from_user(&jc, arg, sizeof(jc)))
2124                return -EFAULT;
2125
2126        if (jc.quality != 0 && jc.quality != 1)
2127                return -EINVAL;
2128
2129        if (cam->stream == STREAM_ON)
2130                if ((err = et61x251_stream_interrupt(cam)))
2131                        return err;
2132
2133        err += et61x251_set_compression(cam, &jc);
2134        if (err) { /* atomic, no rollback in ioctl() */
2135                cam->state |= DEV_MISCONFIGURED;
2136                DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware "
2137                       "problems. To use the camera, close and open "
2138                       "%s again.", video_device_node_name(cam->v4ldev));
2139                return -EIO;
2140        }
2141
2142        cam->compression.quality = jc.quality;
2143
2144        cam->stream = stream;
2145
2146        return 0;
2147}
2148
2149
2150static int
2151et61x251_vidioc_reqbufs(struct et61x251_device* cam, void __user * arg)
2152{
2153        struct v4l2_requestbuffers rb;
2154        u32 i;
2155        int err;
2156
2157        if (copy_from_user(&rb, arg, sizeof(rb)))
2158                return -EFAULT;
2159
2160        if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2161            rb.memory != V4L2_MEMORY_MMAP)
2162                return -EINVAL;
2163
2164        if (cam->io == IO_READ) {
2165                DBG(3, "Close and open the device again to choose the mmap "
2166                       "I/O method");
2167                return -EBUSY;
2168        }
2169
2170        for (i = 0; i < cam->nbuffers; i++)
2171                if (cam->frame[i].vma_use_count) {
2172                        DBG(3, "VIDIOC_REQBUFS failed. "
2173                               "Previous buffers are still mapped.");
2174                        return -EBUSY;
2175                }
2176
2177        if (cam->stream == STREAM_ON)
2178                if ((err = et61x251_stream_interrupt(cam)))
2179                        return err;
2180
2181        et61x251_empty_framequeues(cam);
2182
2183        et61x251_release_buffers(cam);
2184        if (rb.count)
2185                rb.count = et61x251_request_buffers(cam, rb.count, IO_MMAP);
2186
2187        if (copy_to_user(arg, &rb, sizeof(rb))) {
2188                et61x251_release_buffers(cam);
2189                cam->io = IO_NONE;
2190                return -EFAULT;
2191        }
2192
2193        cam->io = rb.count ? IO_MMAP : IO_NONE;
2194
2195        return 0;
2196}
2197
2198
2199static int
2200et61x251_vidioc_querybuf(struct et61x251_device* cam, void __user * arg)
2201{
2202        struct v4l2_buffer b;
2203
2204        if (copy_from_user(&b, arg, sizeof(b)))
2205                return -EFAULT;
2206
2207        if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2208            b.index >= cam->nbuffers || cam->io != IO_MMAP)
2209                return -EINVAL;
2210
2211        memcpy(&b, &cam->frame[b.index].buf, sizeof(b));
2212
2213        if (cam->frame[b.index].vma_use_count)
2214                b.flags |= V4L2_BUF_FLAG_MAPPED;
2215
2216        if (cam->frame[b.index].state == F_DONE)
2217                b.flags |= V4L2_BUF_FLAG_DONE;
2218        else if (cam->frame[b.index].state != F_UNUSED)
2219                b.flags |= V4L2_BUF_FLAG_QUEUED;
2220
2221        if (copy_to_user(arg, &b, sizeof(b)))
2222                return -EFAULT;
2223
2224        return 0;
2225}
2226
2227
2228static int
2229et61x251_vidioc_qbuf(struct et61x251_device* cam, void __user * arg)
2230{
2231        struct v4l2_buffer b;
2232        unsigned long lock_flags;
2233
2234        if (copy_from_user(&b, arg, sizeof(b)))
2235                return -EFAULT;
2236
2237        if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
2238            b.index >= cam->nbuffers || cam->io != IO_MMAP)
2239                return -EINVAL;
2240
2241        if (cam->frame[b.index].state != F_UNUSED)
2242                return -EINVAL;
2243
2244        cam->frame[b.index].state = F_QUEUED;
2245
2246        spin_lock_irqsave(&cam->queue_lock, lock_flags);
2247        list_add_tail(&cam->frame[b.index].frame, &cam->inqueue);
2248        spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2249
2250        PDBGG("Frame #%lu queued", (unsigned long)b.index);
2251
2252        return 0;
2253}
2254
2255
2256static int
2257et61x251_vidioc_dqbuf(struct et61x251_device* cam, struct file* filp,
2258                      void __user * arg)
2259{
2260        struct v4l2_buffer b;
2261        struct et61x251_frame_t *f;
2262        unsigned long lock_flags;
2263        long timeout;
2264
2265        if (copy_from_user(&b, arg, sizeof(b)))
2266                return -EFAULT;
2267
2268        if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP)
2269                return -EINVAL;
2270
2271        if (list_empty(&cam->outqueue)) {
2272                if (cam->stream == STREAM_OFF)
2273                        return -EINVAL;
2274                if (filp->f_flags & O_NONBLOCK)
2275                        return -EAGAIN;
2276                timeout = wait_event_interruptible_timeout
2277                          ( cam->wait_frame,
2278                            (!list_empty(&cam->outqueue)) ||
2279                            (cam->state & DEV_DISCONNECTED) ||
2280                            (cam->state & DEV_MISCONFIGURED),
2281                            cam->module_param.frame_timeout *
2282                            1000 * msecs_to_jiffies(1) );
2283                if (timeout < 0)
2284                        return timeout;
2285                if (cam->state & DEV_DISCONNECTED)
2286                        return -ENODEV;
2287                if (!timeout || (cam->state & DEV_MISCONFIGURED))
2288                        return -EIO;
2289        }
2290
2291        spin_lock_irqsave(&cam->queue_lock, lock_flags);
2292        f = list_entry(cam->outqueue.next, struct et61x251_frame_t, frame);
2293        list_del(cam->outqueue.next);
2294        spin_unlock_irqrestore(&cam->queue_lock, lock_flags);
2295
2296        f->state = F_UNUSED;
2297
2298        memcpy(&b, &f->buf, sizeof(b));
2299        if (f->vma_use_count)
2300                b.flags |= V4L2_BUF_FLAG_MAPPED;
2301
2302        if (copy_to_user(arg, &b, sizeof(b)))
2303                return -EFAULT;
2304
2305        PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index);
2306
2307        return 0;
2308}
2309
2310
2311static int
2312et61x251_vidioc_streamon(struct et61x251_device* cam, void __user * arg)
2313{
2314        int type;
2315
2316        if (copy_from_user(&type, arg, sizeof(type)))
2317                return -EFAULT;
2318
2319        if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2320                return -EINVAL;
2321
2322        cam->stream = STREAM_ON;
2323
2324        DBG(3, "Stream on");
2325
2326        return 0;
2327}
2328
2329
2330static int
2331et61x251_vidioc_streamoff(struct et61x251_device* cam, void __user * arg)
2332{
2333        int type, err;
2334
2335        if (copy_from_user(&type, arg, sizeof(type)))
2336                return -EFAULT;
2337
2338        if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
2339                return -EINVAL;
2340
2341        if (cam->stream == STREAM_ON)
2342                if ((err = et61x251_stream_interrupt(cam)))
2343                        return err;
2344
2345        et61x251_empty_framequeues(cam);
2346
2347        DBG(3, "Stream off");
2348
2349        return 0;
2350}
2351
2352
2353static int
2354et61x251_vidioc_g_parm(struct et61x251_device* cam, void __user * arg)
2355{
2356        struct v4l2_streamparm sp;
2357
2358        if (copy_from_user(&sp, arg, sizeof(sp)))
2359                return -EFAULT;
2360
2361        if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2362                return -EINVAL;
2363
2364        sp.parm.capture.extendedmode = 0;
2365        sp.parm.capture.readbuffers = cam->nreadbuffers;
2366
2367        if (copy_to_user(arg, &sp, sizeof(sp)))
2368                return -EFAULT;
2369
2370        return 0;
2371}
2372
2373
2374static int
2375et61x251_vidioc_s_parm(struct et61x251_device* cam, void __user * arg)
2376{
2377        struct v4l2_streamparm sp;
2378
2379        if (copy_from_user(&sp, arg, sizeof(sp)))
2380                return -EFAULT;
2381
2382        if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2383                return -EINVAL;
2384
2385        sp.parm.capture.extendedmode = 0;
2386
2387        if (sp.parm.capture.readbuffers == 0)
2388                sp.parm.capture.readbuffers = cam->nreadbuffers;
2389
2390        if (sp.parm.capture.readbuffers > ET61X251_MAX_FRAMES)
2391                sp.parm.capture.readbuffers = ET61X251_MAX_FRAMES;
2392
2393        if (copy_to_user(arg, &sp, sizeof(sp)))
2394                return -EFAULT;
2395
2396        cam->nreadbuffers = sp.parm.capture.readbuffers;
2397
2398        return 0;
2399}
2400
2401
2402static long et61x251_ioctl_v4l2(struct file *filp,
2403                               unsigned int cmd, void __user *arg)
2404{
2405        struct et61x251_device *cam = video_drvdata(filp);
2406
2407        switch (cmd) {
2408
2409        case VIDIOC_QUERYCAP:
2410                return et61x251_vidioc_querycap(cam, arg);
2411
2412        case VIDIOC_ENUMINPUT:
2413                return et61x251_vidioc_enuminput(cam, arg);
2414
2415        case VIDIOC_G_INPUT:
2416                return et61x251_vidioc_g_input(cam, arg);
2417
2418        case VIDIOC_S_INPUT:
2419                return et61x251_vidioc_s_input(cam, arg);
2420
2421        case VIDIOC_QUERYCTRL:
2422                return et61x251_vidioc_query_ctrl(cam, arg);
2423
2424        case VIDIOC_G_CTRL:
2425                return et61x251_vidioc_g_ctrl(cam, arg);
2426
2427        case VIDIOC_S_CTRL:
2428                return et61x251_vidioc_s_ctrl(cam, arg);
2429
2430        case VIDIOC_CROPCAP:
2431                return et61x251_vidioc_cropcap(cam, arg);
2432
2433        case VIDIOC_G_CROP:
2434                return et61x251_vidioc_g_crop(cam, arg);
2435
2436        case VIDIOC_S_CROP:
2437                return et61x251_vidioc_s_crop(cam, arg);
2438
2439        case VIDIOC_ENUM_FMT:
2440                return et61x251_vidioc_enum_fmt(cam, arg);
2441
2442        case VIDIOC_G_FMT:
2443                return et61x251_vidioc_g_fmt(cam, arg);
2444
2445        case VIDIOC_TRY_FMT:
2446        case VIDIOC_S_FMT:
2447                return et61x251_vidioc_try_s_fmt(cam, cmd, arg);
2448
2449        case VIDIOC_ENUM_FRAMESIZES:
2450                return et61x251_vidioc_enum_framesizes(cam, arg);
2451
2452        case VIDIOC_G_JPEGCOMP:
2453                return et61x251_vidioc_g_jpegcomp(cam, arg);
2454
2455        case VIDIOC_S_JPEGCOMP:
2456                return et61x251_vidioc_s_jpegcomp(cam, arg);
2457
2458        case VIDIOC_REQBUFS:
2459                return et61x251_vidioc_reqbufs(cam, arg);
2460
2461        case VIDIOC_QUERYBUF:
2462                return et61x251_vidioc_querybuf(cam, arg);
2463
2464        case VIDIOC_QBUF:
2465                return et61x251_vidioc_qbuf(cam, arg);
2466
2467        case VIDIOC_DQBUF:
2468                return et61x251_vidioc_dqbuf(cam, filp, arg);
2469
2470        case VIDIOC_STREAMON:
2471                return et61x251_vidioc_streamon(cam, arg);
2472
2473        case VIDIOC_STREAMOFF:
2474                return et61x251_vidioc_streamoff(cam, arg);
2475
2476        case VIDIOC_G_PARM:
2477                return et61x251_vidioc_g_parm(cam, arg);
2478
2479        case VIDIOC_S_PARM:
2480                return et61x251_vidioc_s_parm(cam, arg);
2481
2482        case VIDIOC_G_STD:
2483        case VIDIOC_S_STD:
2484        case VIDIOC_QUERYSTD:
2485        case VIDIOC_ENUMSTD:
2486        case VIDIOC_QUERYMENU:
2487        case VIDIOC_ENUM_FRAMEINTERVALS:
2488                return -EINVAL;
2489
2490        default:
2491                return -EINVAL;
2492
2493        }
2494}
2495
2496
2497static long et61x251_ioctl(struct file *filp,
2498                         unsigned int cmd, unsigned long arg)
2499{
2500        struct et61x251_device *cam = video_drvdata(filp);
2501        long err = 0;
2502
2503        if (mutex_lock_interruptible(&cam->fileop_mutex))
2504                return -ERESTARTSYS;
2505
2506        if (cam->state & DEV_DISCONNECTED) {
2507                DBG(1, "Device not present");
2508                mutex_unlock(&cam->fileop_mutex);
2509                return -ENODEV;
2510        }
2511
2512        if (cam->state & DEV_MISCONFIGURED) {
2513                DBG(1, "The camera is misconfigured. Close and open it "
2514                       "again.");
2515                mutex_unlock(&cam->fileop_mutex);
2516                return -EIO;
2517        }
2518
2519        V4LDBG(3, "et61x251", cmd);
2520
2521        err = et61x251_ioctl_v4l2(filp, cmd, (void __user *)arg);
2522
2523        mutex_unlock(&cam->fileop_mutex);
2524
2525        return err;
2526}
2527
2528
2529static const struct v4l2_file_operations et61x251_fops = {
2530        .owner = THIS_MODULE,
2531        .open =    et61x251_open,
2532        .release = et61x251_release,
2533        .ioctl =   et61x251_ioctl,
2534        .read =    et61x251_read,
2535        .poll =    et61x251_poll,
2536        .mmap =    et61x251_mmap,
2537};
2538
2539/*****************************************************************************/
2540
2541/* It exists a single interface only. We do not need to validate anything. */
2542static int
2543et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
2544{
2545        struct usb_device *udev = interface_to_usbdev(intf);
2546        struct et61x251_device* cam;
2547        static unsigned int dev_nr;
2548        unsigned int i;
2549        int err = 0;
2550
2551        if (!(cam = kzalloc(sizeof(struct et61x251_device), GFP_KERNEL)))
2552                return -ENOMEM;
2553
2554        cam->usbdev = udev;
2555
2556        if (!(cam->control_buffer = kzalloc(8, GFP_KERNEL))) {
2557                DBG(1, "kmalloc() failed");
2558                err = -ENOMEM;
2559                goto fail;
2560        }
2561
2562        if (!(cam->v4ldev = video_device_alloc())) {
2563                DBG(1, "video_device_alloc() failed");
2564                err = -ENOMEM;
2565                goto fail;
2566        }
2567
2568        DBG(2, "ET61X[12]51 PC Camera Controller detected "
2569               "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
2570
2571        for  (i = 0; et61x251_sensor_table[i]; i++) {
2572                err = et61x251_sensor_table[i](cam);
2573                if (!err)
2574                        break;
2575        }
2576
2577        if (!err)
2578                DBG(2, "%s image sensor detected", cam->sensor.name);
2579        else {
2580                DBG(1, "No supported image sensor detected");
2581                err = -ENODEV;
2582                goto fail;
2583        }
2584
2585        if (et61x251_init(cam)) {
2586                DBG(1, "Initialization failed. I will retry on open().");
2587                cam->state |= DEV_MISCONFIGURED;
2588        }
2589
2590        strcpy(cam->v4ldev->name, "ET61X[12]51 PC Camera");
2591        cam->v4ldev->fops = &et61x251_fops;
2592        cam->v4ldev->release = video_device_release;
2593        cam->v4ldev->parent = &udev->dev;
2594        video_set_drvdata(cam->v4ldev, cam);
2595
2596        init_completion(&cam->probe);
2597
2598        err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
2599                                    video_nr[dev_nr]);
2600        if (err) {
2601                DBG(1, "V4L2 device registration failed");
2602                if (err == -ENFILE && video_nr[dev_nr] == -1)
2603                        DBG(1, "Free /dev/videoX node not found");
2604                video_nr[dev_nr] = -1;
2605                dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2606                complete_all(&cam->probe);
2607                goto fail;
2608        }
2609
2610        DBG(2, "V4L2 device registered as %s",
2611            video_device_node_name(cam->v4ldev));
2612
2613        cam->module_param.force_munmap = force_munmap[dev_nr];
2614        cam->module_param.frame_timeout = frame_timeout[dev_nr];
2615
2616        dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
2617
2618#ifdef CONFIG_VIDEO_ADV_DEBUG
2619        err = et61x251_create_sysfs(cam);
2620        if (!err)
2621                DBG(2, "Optional device control through 'sysfs' "
2622                       "interface ready");
2623        else
2624                DBG(2, "Failed to create 'sysfs' interface for optional "
2625                       "device controlling. Error #%d", err);
2626#else
2627        DBG(2, "Optional device control through 'sysfs' interface disabled");
2628        DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
2629               "configuration option to enable it.");
2630#endif
2631
2632        usb_set_intfdata(intf, cam);
2633        kref_init(&cam->kref);
2634        usb_get_dev(cam->usbdev);
2635
2636        complete_all(&cam->probe);
2637
2638        return 0;
2639
2640fail:
2641        if (cam) {
2642                kfree(cam->control_buffer);
2643                if (cam->v4ldev)
2644                        video_device_release(cam->v4ldev);
2645                kfree(cam);
2646        }
2647        return err;
2648}
2649
2650
2651static void et61x251_usb_disconnect(struct usb_interface* intf)
2652{
2653        struct et61x251_device* cam;
2654
2655        down_write(&et61x251_dev_lock);
2656
2657        cam = usb_get_intfdata(intf);
2658
2659        DBG(2, "Disconnecting %s...", cam->v4ldev->name);
2660
2661        if (cam->users) {
2662                DBG(2, "Device %s is open! Deregistration and memory "
2663                       "deallocation are deferred.",
2664                    video_device_node_name(cam->v4ldev));
2665                cam->state |= DEV_MISCONFIGURED;
2666                et61x251_stop_transfer(cam);
2667                cam->state |= DEV_DISCONNECTED;
2668                wake_up_interruptible(&cam->wait_frame);
2669                wake_up(&cam->wait_stream);
2670        } else
2671                cam->state |= DEV_DISCONNECTED;
2672
2673        wake_up_interruptible_all(&cam->wait_open);
2674
2675        kref_put(&cam->kref, et61x251_release_resources);
2676
2677        up_write(&et61x251_dev_lock);
2678}
2679
2680
2681static struct usb_driver et61x251_usb_driver = {
2682        .name =       "et61x251",
2683        .id_table =   et61x251_id_table,
2684        .probe =      et61x251_usb_probe,
2685        .disconnect = et61x251_usb_disconnect,
2686};
2687
2688/*****************************************************************************/
2689
2690static int __init et61x251_module_init(void)
2691{
2692        int err = 0;
2693
2694        KDBG(2, ET61X251_MODULE_NAME " v" ET61X251_MODULE_VERSION);
2695        KDBG(3, ET61X251_MODULE_AUTHOR);
2696
2697        if ((err = usb_register(&et61x251_usb_driver)))
2698                KDBG(1, "usb_register() failed");
2699
2700        return err;
2701}
2702
2703
2704static void __exit et61x251_module_exit(void)
2705{
2706        usb_deregister(&et61x251_usb_driver);
2707}
2708
2709
2710module_init(et61x251_module_init);
2711module_exit(et61x251_module_exit);
2712