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   1 /*
   2  * copyright (C) 1999/2000 by Henning Zabel <henning@uni-paderborn.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19
  20 /*
  21  *      USB-Kernel Driver for the Mustek MDC800 Digital Camera
  22  *      (c) 1999/2000 Henning Zabel <henning@uni-paderborn.de>
  23  *
  24  *
  25  * The driver brings the USB functions of the MDC800 to Linux.
  26  * To use the Camera you must support the USB Protocol of the camera
  27  * to the Kernel Node.
  28  * The Driver uses a misc device Node. Create it with :
  29  * mknod /dev/mustek c 180 32
  30  *
  31  * The driver supports only one camera.
  32  *
  33  * Fix: mdc800 used sleep_on and slept with io_lock held.
  34  * Converted sleep_on to waitqueues with schedule_timeout and made io_lock
  35  * a semaphore from a spinlock.
  36  * by Oliver Neukum <oliver@neukum.name>
  37  * (02/12/2001)
  38  *
  39  * Identify version on module load.
  40  * (08/04/2001) gb
  41  *
  42  * version 0.7.5
  43  * Fixed potential SMP races with Spinlocks.
  44  * Thanks to Oliver Neukum <oliver@neukum.name> who
  45  * noticed the race conditions.
  46  * (30/10/2000)
  47  *
  48  * Fixed: Setting urb->dev before submitting urb.
  49  * by Greg KH <greg@kroah.com>
  50  * (13/10/2000)
  51  *
  52  * version 0.7.3
  53  * bugfix : The mdc800->state field gets set to READY after the
  54  * the diconnect function sets it to NOT_CONNECTED. This makes the
  55  * driver running like the camera is connected and causes some
  56  * hang ups.
  57  *
  58  * version 0.7.1
  59  * MOD_INC and MOD_DEC are changed in usb_probe to prevent load/unload
  60  * problems when compiled as Module.
  61  * (04/04/2000)
  62  *
  63  * The mdc800 driver gets assigned the USB Minor 32-47. The Registration
  64  * was updated to use these values.
  65  * (26/03/2000)
  66  *
  67  * The Init und Exit Module Function are updated.
  68  * (01/03/2000)
  69  *
  70  * version 0.7.0
  71  * Rewrite of the driver : The driver now uses URB's. The old stuff
  72  * has been removed.
  73  *
  74  * version 0.6.0
  75  * Rewrite of this driver: The Emulation of the rs232 protocoll
  76  * has been removed from the driver. A special executeCommand function
  77  * for this driver is included to gphoto.
  78  * The driver supports two kind of communication to bulk endpoints.
  79  * Either with the dev->bus->ops->bulk... or with callback function.
  80  * (09/11/1999)
  81  *
  82  * version 0.5.0:
  83  * first Version that gets a version number. Most of the needed
  84  * functions work.
  85  * (20/10/1999)
  86  */
  87
  88 #include <linux/sched.h>
  89 #include <linux/signal.h>
  90 #include <linux/spinlock.h>
  91 #include <linux/errno.h>
  92 #include <linux/random.h>
  93 #include <linux/poll.h>
  94 #include <linux/init.h>
  95 #include <linux/slab.h>
  96 #include <linux/module.h>
  97 #include <linux/smp_lock.h>
  98 #include <linux/wait.h>
  99 #include <linux/mutex.h>
 100
 101 #include <linux/usb.h>
 102 #include <linux/fs.h>
 103
 104 /*
 105  * Version Information
 106  */
 107 #define DRIVER_VERSION "v0.7.5 (30/10/2000)"
 108 #define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>"
 109 #define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera"
 110
 111 /* Vendor and Product Information */
 112 #define MDC800_VENDOR_ID        0x055f
 113 #define MDC800_PRODUCT_ID       0xa800
 114
 115 /* Timeouts (msec) */
 116 #define TO_DOWNLOAD_GET_READY           1500
 117 #define TO_DOWNLOAD_GET_BUSY            1500
 118 #define TO_WRITE_GET_READY              1000
 119 #define TO_DEFAULT_COMMAND              5000
 120 #define TO_READ_FROM_IRQ                TO_DEFAULT_COMMAND
 121 #define TO_GET_READY                    TO_DEFAULT_COMMAND
 122
 123 /* Minor Number of the device (create with mknod /dev/mustek c 180 32) */
 124 #define MDC800_DEVICE_MINOR_BASE 32
 125
 126
 127 /**************************************************************************
 128         Data and structs
 129 ***************************************************************************/
 130
 131
 132 typedef enum {
 133         NOT_CONNECTED, READY, WORKING, DOWNLOAD
 134 } mdc800_state;
 135
 136
 137 /* Data for the driver */
 138 struct mdc800_data
 139 {
 140         struct usb_device *     dev;                    // Device Data
 141         mdc800_state            state;
 142
 143         unsigned int            endpoint [4];
 144
 145         struct urb *            irq_urb;
 146         wait_queue_head_t       irq_wait;
 147         int                     irq_woken;
 148         char*                   irq_urb_buffer;
 149
 150         int                     camera_busy;          // is camera busy ?
 151         int                     camera_request_ready; // Status to synchronize with irq
 152         char                    camera_response [8];  // last Bytes send after busy
 153
 154         struct urb *            write_urb;
 155         char*                   write_urb_buffer;
 156         wait_queue_head_t       write_wait;
 157         int                     written;
 158
 159
 160         struct urb *            download_urb;
 161         char*                   download_urb_buffer;
 162         wait_queue_head_t       download_wait;
 163         int                     downloaded;
 164         int                     download_left;          // Bytes left to download ?
 165
 166
 167         /* Device Data */
 168         char                    out [64];       // Answer Buffer
 169         int                     out_ptr;        // Index to the first not readen byte
 170         int                     out_count;      // Bytes in the buffer
 171
 172         int                     open;           // Camera device open ?
 173         struct mutex            io_lock;        // IO -lock
 174
 175         char                    in [8];         // Command Input Buffer
 176         int                     in_count;
 177
 178         int                     pic_index;      // Cache for the Imagesize (-1 for nothing cached )
 179         int                     pic_len;
 180         int                     minor;
 181 };
 182
 183
 184 /* Specification of the Endpoints */
 185 static struct usb_endpoint_descriptor mdc800_ed [4] =
 186 {
 187         {
 188                 .bLength =              0,
 189                 .bDescriptorType =      0,
 190                 .bEndpointAddress =     0x01,
 191                 .bmAttributes =         0x02,
 192                 .wMaxPacketSize =       __constant_cpu_to_le16(8),
 193                 .bInterval =            0,
 194                 .bRefresh =             0,
 195                 .bSynchAddress =        0,
 196         },
 197         {
 198                 .bLength =              0,
 199                 .bDescriptorType =      0,
 200                 .bEndpointAddress =     0x82,
 201                 .bmAttributes =         0x03,
 202                 .wMaxPacketSize =       __constant_cpu_to_le16(8),
 203                 .bInterval =            0,
 204                 .bRefresh =             0,
 205                 .bSynchAddress =        0,
 206         },
 207         {
 208                 .bLength =              0,
 209                 .bDescriptorType =      0,
 210                 .bEndpointAddress =     0x03,
 211                 .bmAttributes =         0x02,
 212                 .wMaxPacketSize =       __constant_cpu_to_le16(64),
 213                 .bInterval =            0,
 214                 .bRefresh =             0,
 215                 .bSynchAddress =        0,
 216         },
 217         {
 218                 .bLength =              0,
 219                 .bDescriptorType =      0,
 220                 .bEndpointAddress =     0x84,
 221                 .bmAttributes =         0x02,
 222                 .wMaxPacketSize =       __constant_cpu_to_le16(64),
 223                 .bInterval =            0,
 224                 .bRefresh =             0,
 225                 .bSynchAddress =        0,
 226         },
 227 };
 228
 229 /* The Variable used by the driver */
 230 static struct mdc800_data* mdc800;
 231
 232
 233 /***************************************************************************
 234         The USB Part of the driver
 235 ****************************************************************************/
 236
 237 static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b)
 238 {
 239         return (
 240                    ( a->bEndpointAddress == b->bEndpointAddress )
 241                 && ( a->bmAttributes     == b->bmAttributes     )
 242                 && ( a->wMaxPacketSize   == b->wMaxPacketSize   )
 243         );
 244 }
 245
 246
 247 /*
 248  * Checks whether the camera responds busy
 249  */
 250 static int mdc800_isBusy (char* ch)
 251 {
 252         int i=0;
 253         while (i<8)
 254         {
 255                 if (ch [i] != (char)0x99)
 256                         return 0;
 257                 i++;
 258         }
 259         return 1;
 260 }
 261
 262
 263 /*
 264  * Checks whether the Camera is ready
 265  */
 266 static int mdc800_isReady (char *ch)
 267 {
 268         int i=0;
 269         while (i<8)
 270         {
 271                 if (ch [i] != (char)0xbb)
 272                         return 0;
 273                 i++;
 274         }
 275         return 1;
 276 }
 277
 278
 279
 280 /*
 281  * USB IRQ Handler for InputLine
 282  */
 283 static void mdc800_usb_irq (struct urb *urb)
 284 {
 285         int data_received=0, wake_up;
 286         unsigned char* b=urb->transfer_buffer;
 287         struct mdc800_data* mdc800=urb->context;
 288
 289         if (urb->status >= 0)
 290         {
 291
 292                 //dbg ("%i %i %i %i %i %i %i %i \n",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]);
 293
 294                 if (mdc800_isBusy (b))
 295                 {
 296                         if (!mdc800->camera_busy)
 297                         {
 298                                 mdc800->camera_busy=1;
 299                                 dbg ("gets busy");
 300                         }
 301                 }
 302                 else
 303                 {
 304                         if (mdc800->camera_busy && mdc800_isReady (b))
 305                         {
 306                                 mdc800->camera_busy=0;
 307                                 dbg ("gets ready");
 308                         }
 309                 }
 310                 if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
 311                 {
 312                         /* Store Data in camera_answer field */
 313                         dbg ("%i %i %i %i %i %i %i %i ",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]);
 314
 315                         memcpy (mdc800->camera_response,b,8);
 316                         data_received=1;
 317                 }
 318         }
 319         wake_up= ( mdc800->camera_request_ready > 0 )
 320                 &&
 321                 (
 322                         ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
 323                 ||
 324                         ((mdc800->camera_request_ready == 2) && data_received)
 325                 ||
 326                         ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
 327                 ||
 328                         (urb->status < 0)
 329                 );
 330
 331         if (wake_up)
 332         {
 333                 mdc800->camera_request_ready=0;
 334                 mdc800->irq_woken=1;
 335                 wake_up (&mdc800->irq_wait);
 336         }
 337 }
 338
 339
 340 /*
 341  * Waits a while until the irq responds that camera is ready
 342  *
 343  *  mode : 0: Wait for camera gets ready
 344  *         1: Wait for receiving data
 345  *         2: Wait for camera gets busy
 346  *
 347  * msec: Time to wait
 348  */
 349 static int mdc800_usb_waitForIRQ (int mode, int msec)
 350 {
 351         mdc800->camera_request_ready=1+mode;
 352
 353         wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000);
 354         mdc800->irq_woken = 0;
 355
 356         if (mdc800->camera_request_ready>0)
 357         {
 358                 mdc800->camera_request_ready=0;
 359                 err ("timeout waiting for camera.");
 360                 return -1;
 361         }
 362
 363         if (mdc800->state == NOT_CONNECTED)
 364         {
 365                 warn ("Camera gets disconnected during waiting for irq.");
 366                 mdc800->camera_request_ready=0;
 367                 return -2;
 368         }
 369
 370         return 0;
 371 }
 372
 373
 374 /*
 375  * The write_urb callback function
 376  */
 377 static void mdc800_usb_write_notify (struct urb *urb)
 378 {
 379         struct mdc800_data* mdc800=urb->context;
 380
 381         if (urb->status != 0)
 382         {
 383                 err ("writing command fails (status=%i)", urb->status);
 384         }
 385         else
 386         {
 387                 mdc800->state=READY;
 388         }
 389         mdc800->written = 1;
 390         wake_up (&mdc800->write_wait);
 391 }
 392
 393
 394 /*
 395  * The download_urb callback function
 396  */
 397 static void mdc800_usb_download_notify (struct urb *urb)
 398 {
 399         struct mdc800_data* mdc800=urb->context;
 400
 401         if (urb->status == 0)
 402         {
 403                 /* Fill output buffer with these data */
 404                 memcpy (mdc800->out,  urb->transfer_buffer, 64);
 405                 mdc800->out_count=64;
 406                 mdc800->out_ptr=0;
 407                 mdc800->download_left-=64;
 408                 if (mdc800->download_left == 0)
 409                 {
 410                         mdc800->state=READY;
 411                 }
 412         }
 413         else
 414         {
 415                 err ("request bytes fails (status:%i)", urb->status);
 416         }
 417         mdc800->downloaded = 1;
 418         wake_up (&mdc800->download_wait);
 419 }
 420
 421
 422 /***************************************************************************
 423         Probing for the Camera
 424  ***************************************************************************/
 425
 426 static struct usb_driver mdc800_usb_driver;
 427 static const struct file_operations mdc800_device_ops;
 428 static struct usb_class_driver mdc800_class = {
 429         .name =         "mdc800%d",
 430         .fops =         &mdc800_device_ops,
 431         .minor_base =   MDC800_DEVICE_MINOR_BASE,
 432 };
 433
 434
 435 /*
 436  * Callback to search the Mustek MDC800 on the USB Bus
 437  */
 438 static int mdc800_usb_probe (struct usb_interface *intf,
 439                                const struct usb_device_id *id)
 440 {
 441         int i,j;
 442         struct usb_host_interface *intf_desc;
 443         struct usb_device *dev = interface_to_usbdev (intf);
 444         int irq_interval=0;
 445         int retval;
 446
 447         dbg ("(mdc800_usb_probe) called.");
 448
 449
 450         if (mdc800->dev != NULL)
 451         {
 452                 warn ("only one Mustek MDC800 is supported.");
 453                 return -ENODEV;
 454         }
 455
 456         if (dev->descriptor.bNumConfigurations != 1)
 457         {
 458                 err ("probe fails -> wrong Number of Configuration");
 459                 return -ENODEV;
 460         }
 461         intf_desc = intf->cur_altsetting;
 462
 463         if (
 464                         ( intf_desc->desc.bInterfaceClass != 0xff )
 465                 ||      ( intf_desc->desc.bInterfaceSubClass != 0 )
 466                 || ( intf_desc->desc.bInterfaceProtocol != 0 )
 467                 || ( intf_desc->desc.bNumEndpoints != 4)
 468         )
 469         {
 470                 err ("probe fails -> wrong Interface");
 471                 return -ENODEV;
 472         }
 473
 474         /* Check the Endpoints */
 475         for (i=0; i<4; i++)
 476         {
 477                 mdc800->endpoint[i]=-1;
 478                 for (j=0; j<4; j++)
 479                 {
 480                         if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
 481                         {
 482                                 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
 483                                 if (i==1)
 484                                 {
 485                                         irq_interval=intf_desc->endpoint [j].desc.bInterval;
 486                                 }
 487
 488                                 continue;
 489                         }
 490                 }
 491                 if (mdc800->endpoint[i] == -1)
 492                 {
 493                         err ("probe fails -> Wrong Endpoints.");
 494                         return -ENODEV;
 495                 }
 496         }
 497
 498
 499         info ("Found Mustek MDC800 on USB.");
 500
 501         mutex_lock(&mdc800->io_lock);
 502
 503         retval = usb_register_dev(intf, &mdc800_class);
 504         if (retval) {
 505                 err ("Not able to get a minor for this device.");
 506                 return -ENODEV;
 507         }
 508
 509         mdc800->dev=dev;
 510         mdc800->open=0;
 511
 512         /* Setup URB Structs */
 513         usb_fill_int_urb (
 514                 mdc800->irq_urb,
 515                 mdc800->dev,
 516                 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
 517                 mdc800->irq_urb_buffer,
 518                 8,
 519                 mdc800_usb_irq,
 520                 mdc800,
 521                 irq_interval
 522         );
 523
 524         usb_fill_bulk_urb (
 525                 mdc800->write_urb,
 526                 mdc800->dev,
 527                 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
 528                 mdc800->write_urb_buffer,
 529                 8,
 530                 mdc800_usb_write_notify,
 531                 mdc800
 532         );
 533
 534         usb_fill_bulk_urb (
 535                 mdc800->download_urb,
 536                 mdc800->dev,
 537                 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
 538                 mdc800->download_urb_buffer,
 539                 64,
 540                 mdc800_usb_download_notify,
 541                 mdc800
 542         );
 543
 544         mdc800->state=READY;
 545
 546         mutex_unlock(&mdc800->io_lock);
 547
 548         usb_set_intfdata(intf, mdc800);
 549         return 0;
 550 }
 551
 552
 553 /*
 554  * Disconnect USB device (maybe the MDC800)
 555  */
 556 static void mdc800_usb_disconnect (struct usb_interface *intf)
 557 {
 558         struct mdc800_data* mdc800 = usb_get_intfdata(intf);
 559
 560         dbg ("(mdc800_usb_disconnect) called");
 561
 562         if (mdc800) {
 563                 if (mdc800->state == NOT_CONNECTED)
 564                         return;
 565
 566                 usb_deregister_dev(intf, &mdc800_class);
 567
 568                 /* must be under lock to make sure no URB
 569                    is submitted after usb_kill_urb() */
 570                 mutex_lock(&mdc800->io_lock);
 571                 mdc800->state=NOT_CONNECTED;
 572
 573                 usb_kill_urb(mdc800->irq_urb);
 574                 usb_kill_urb(mdc800->write_urb);
 575                 usb_kill_urb(mdc800->download_urb);
 576                 mutex_unlock(&mdc800->io_lock);
 577
 578                 mdc800->dev = NULL;
 579                 usb_set_intfdata(intf, NULL);
 580         }
 581         info ("Mustek MDC800 disconnected from USB.");
 582 }
 583
 584
 585 /***************************************************************************
 586         The Misc device Part (file_operations)
 587 ****************************************************************************/
 588
 589 /*
 590  * This Function calc the Answersize for a command.
 591  */
 592 static int mdc800_getAnswerSize (char command)
 593 {
 594         switch ((unsigned char) command)
 595         {
 596                 case 0x2a:
 597                 case 0x49:
 598                 case 0x51:
 599                 case 0x0d:
 600                 case 0x20:
 601                 case 0x07:
 602                 case 0x01:
 603                 case 0x25:
 604                 case 0x00:
 605                         return 8;
 606
 607                 case 0x05:
 608                 case 0x3e:
 609                         return mdc800->pic_len;
 610
 611                 case 0x09:
 612                         return 4096;
 613
 614                 default:
 615                         return 0;
 616         }
 617 }
 618
 619
 620 /*
 621  * Init the device: (1) alloc mem (2) Increase MOD Count ..
 622  */
 623 static int mdc800_device_open (struct inode* inode, struct file *file)
 624 {
 625         int retval=0;
 626         int errn=0;
 627
 628         mutex_lock(&mdc800->io_lock);
 629
 630         if (mdc800->state == NOT_CONNECTED)
 631         {
 632                 errn=-EBUSY;
 633                 goto error_out;
 634         }
 635         if (mdc800->open)
 636         {
 637                 errn=-EBUSY;
 638                 goto error_out;
 639         }
 640
 641         mdc800->in_count=0;
 642         mdc800->out_count=0;
 643         mdc800->out_ptr=0;
 644         mdc800->pic_index=0;
 645         mdc800->pic_len=-1;
 646         mdc800->download_left=0;
 647
 648         mdc800->camera_busy=0;
 649         mdc800->camera_request_ready=0;
 650
 651         retval=0;
 652         mdc800->irq_urb->dev = mdc800->dev;
 653         if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
 654         {
 655                 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
 656                 errn = -EIO;
 657                 goto error_out;
 658         }
 659
 660         mdc800->open=1;
 661         dbg ("Mustek MDC800 device opened.");
 662
 663 error_out:
 664         mutex_unlock(&mdc800->io_lock);
 665         return errn;
 666 }
 667
 668
 669 /*
 670  * Close the Camera and release Memory
 671  */
 672 static int mdc800_device_release (struct inode* inode, struct file *file)
 673 {
 674         int retval=0;
 675         dbg ("Mustek MDC800 device closed.");
 676
 677         mutex_lock(&mdc800->io_lock);
 678         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
 679         {
 680                 usb_kill_urb(mdc800->irq_urb);
 681                 usb_kill_urb(mdc800->write_urb);
 682                 usb_kill_urb(mdc800->download_urb);
 683                 mdc800->open=0;
 684         }
 685         else
 686         {
 687                 retval=-EIO;
 688         }
 689
 690         mutex_unlock(&mdc800->io_lock);
 691         return retval;
 692 }
 693
 694
 695 /*
 696  * The Device read callback Function
 697  */
 698 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
 699 {
 700         size_t left=len, sts=len; /* single transfer size */
 701         char __user *ptr = buf;
 702
 703         mutex_lock(&mdc800->io_lock);
 704         if (mdc800->state == NOT_CONNECTED)
 705         {
 706                 mutex_unlock(&mdc800->io_lock);
 707                 return -EBUSY;
 708         }
 709         if (mdc800->state == WORKING)
 710         {
 711                 warn ("Illegal State \"working\" reached during read ?!");
 712                 mutex_unlock(&mdc800->io_lock);
 713                 return -EBUSY;
 714         }
 715         if (!mdc800->open)
 716         {
 717                 mutex_unlock(&mdc800->io_lock);
 718                 return -EBUSY;
 719         }
 720
 721         while (left)
 722         {
 723                 if (signal_pending (current))
 724                 {
 725                         mutex_unlock(&mdc800->io_lock);
 726                         return -EINTR;
 727                 }
 728
 729                 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
 730
 731                 if (sts <= 0)
 732                 {
 733                         /* Too less Data in buffer */
 734                         if (mdc800->state == DOWNLOAD)
 735                         {
 736                                 mdc800->out_count=0;
 737                                 mdc800->out_ptr=0;
 738
 739                                 /* Download -> Request new bytes */
 740                                 mdc800->download_urb->dev = mdc800->dev;
 741                                 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
 742                                 {
 743                                         err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
 744                                         mutex_unlock(&mdc800->io_lock);
 745                                         return len-left;
 746                                 }
 747                                 wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
 748                                                                                 TO_DOWNLOAD_GET_READY*HZ/1000);
 749                                 mdc800->downloaded = 0;
 750                                 if (mdc800->download_urb->status != 0)
 751                                 {
 752                                         err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
 753                                         mutex_unlock(&mdc800->io_lock);
 754                                         return len-left;
 755                                 }
 756                         }
 757                         else
 758                         {
 759                                 /* No more bytes -> that's an error*/
 760                                 mutex_unlock(&mdc800->io_lock);
 761                                 return -EIO;
 762                         }
 763                 }
 764                 else
 765                 {
 766                         /* Copy Bytes */
 767                         if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
 768                                                 sts)) {
 769                                 mutex_unlock(&mdc800->io_lock);
 770                                 return -EFAULT;
 771                         }
 772                         ptr+=sts;
 773                         left-=sts;
 774                         mdc800->out_ptr+=sts;
 775                 }
 776         }
 777
 778         mutex_unlock(&mdc800->io_lock);
 779         return len-left;
 780 }
 781
 782
 783 /*
 784  * The Device write callback Function
 785  * If a 8Byte Command is received, it will be send to the camera.
 786  * After this the driver initiates the request for the answer or
 787  * just waits until the camera becomes ready.
 788  */
 789 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
 790 {
 791         size_t i=0;
 792
 793         mutex_lock(&mdc800->io_lock);
 794         if (mdc800->state != READY)
 795         {
 796                 mutex_unlock(&mdc800->io_lock);
 797                 return -EBUSY;
 798         }
 799         if (!mdc800->open )
 800         {
 801                 mutex_unlock(&mdc800->io_lock);
 802                 return -EBUSY;
 803         }
 804
 805         while (i<len)
 806         {
 807                 unsigned char c;
 808                 if (signal_pending (current))
 809                 {
 810                         mutex_unlock(&mdc800->io_lock);
 811                         return -EINTR;
 812                 }
 813
 814                 if(get_user(c, buf+i))
 815                 {
 816                         mutex_unlock(&mdc800->io_lock);
 817                         return -EFAULT;
 818                 }
 819
 820                 /* check for command start */
 821                 if (c == 0x55)
 822                 {
 823                         mdc800->in_count=0;
 824                         mdc800->out_count=0;
 825                         mdc800->out_ptr=0;
 826                         mdc800->download_left=0;
 827                 }
 828
 829                 /* save command byte */
 830                 if (mdc800->in_count < 8)
 831                 {
 832                         mdc800->in[mdc800->in_count] = c;
 833                         mdc800->in_count++;
 834                 }
 835                 else
 836                 {
 837                         mutex_unlock(&mdc800->io_lock);
 838                         return -EIO;
 839                 }
 840
 841                 /* Command Buffer full ? -> send it to camera */
 842                 if (mdc800->in_count == 8)
 843                 {
 844                         int answersize;
 845
 846                         if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
 847                         {
 848                                 err ("Camera didn't get ready.\n");
 849                                 mutex_unlock(&mdc800->io_lock);
 850                                 return -EIO;
 851                         }
 852
 853                         answersize=mdc800_getAnswerSize (mdc800->in[1]);
 854
 855                         mdc800->state=WORKING;
 856                         memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
 857                         mdc800->write_urb->dev = mdc800->dev;
 858                         if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
 859                         {
 860                                 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
 861                                 mutex_unlock(&mdc800->io_lock);
 862                                 return -EIO;
 863                         }
 864                         wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
 865                         mdc800->written = 0;
 866                         if (mdc800->state == WORKING)
 867                         {
 868                                 usb_kill_urb(mdc800->write_urb);
 869                                 mutex_unlock(&mdc800->io_lock);
 870                                 return -EIO;
 871                         }
 872
 873                         switch ((unsigned char) mdc800->in[1])
 874                         {
 875                                 case 0x05: /* Download Image */
 876                                 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
 877                                         if (mdc800->pic_len < 0)
 878                                         {
 879                                                 err ("call 0x07 before 0x05,0x3e");
 880                                                 mdc800->state=READY;
 881                                                 mutex_unlock(&mdc800->io_lock);
 882                                                 return -EIO;
 883                                         }
 884                                         mdc800->pic_len=-1;
 885
 886                                 case 0x09: /* Download Thumbnail */
 887                                         mdc800->download_left=answersize+64;
 888                                         mdc800->state=DOWNLOAD;
 889                                         mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
 890                                         break;
 891
 892
 893                                 default:
 894                                         if (answersize)
 895                                         {
 896
 897                                                 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
 898                                                 {
 899                                                         err ("requesting answer from irq fails");
 900                                                         mutex_unlock(&mdc800->io_lock);
 901                                                         return -EIO;
 902                                                 }
 903
 904                                                 /* Write dummy data, (this is ugly but part of the USB Protocol */
 905                                                 /* if you use endpoint 1 as bulk and not as irq) */
 906                                                 memcpy (mdc800->out, mdc800->camera_response,8);
 907
 908                                                 /* This is the interpreted answer */
 909                                                 memcpy (&mdc800->out[8], mdc800->camera_response,8);
 910
 911                                                 mdc800->out_ptr=0;
 912                                                 mdc800->out_count=16;
 913
 914                                                 /* Cache the Imagesize, if command was getImageSize */
 915                                                 if (mdc800->in [1] == (char) 0x07)
 916                                                 {
 917                                                         mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
 918
 919                                                         dbg ("cached imagesize = %i",mdc800->pic_len);
 920                                                 }
 921
 922                                         }
 923                                         else
 924                                         {
 925                                                 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
 926                                                 {
 927                                                         err ("Command Timeout.");
 928                                                         mutex_unlock(&mdc800->io_lock);
 929                                                         return -EIO;
 930                                                 }
 931                                         }
 932                                         mdc800->state=READY;
 933                                         break;
 934                         }
 935                 }
 936                 i++;
 937         }
 938         mutex_unlock(&mdc800->io_lock);
 939         return i;
 940 }
 941
 942
 943 /***************************************************************************
 944         Init and Cleanup this driver (Structs and types)
 945 ****************************************************************************/
 946
 947 /* File Operations of this drivers */
 948 static const struct file_operations mdc800_device_ops =
 949 {
 950         .owner =        THIS_MODULE,
 951         .read =         mdc800_device_read,
 952         .write =        mdc800_device_write,
 953         .open =         mdc800_device_open,
 954         .release =      mdc800_device_release,
 955 };
 956
 957
 958
 959 static struct usb_device_id mdc800_table [] = {
 960         { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
 961         { }                                             /* Terminating entry */
 962 };
 963
 964 MODULE_DEVICE_TABLE (usb, mdc800_table);
 965 /*
 966  * USB Driver Struct for this device
 967  */
 968 static struct usb_driver mdc800_usb_driver =
 969 {
 970         .name =         "mdc800",
 971         .probe =        mdc800_usb_probe,
 972         .disconnect =   mdc800_usb_disconnect,
 973         .id_table =     mdc800_table
 974 };
 975
 976
 977
 978 /************************************************************************
 979         Init and Cleanup this driver (Main Functions)
 980 *************************************************************************/
 981
 982 static int __init usb_mdc800_init (void)
 983 {
 984         int retval = -ENODEV;
 985         /* Allocate Memory */
 986         mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
 987         if (!mdc800)
 988                 goto cleanup_on_fail;
 989
 990         mdc800->dev = NULL;
 991         mdc800->state=NOT_CONNECTED;
 992         mutex_init (&mdc800->io_lock);
 993
 994         init_waitqueue_head (&mdc800->irq_wait);
 995         init_waitqueue_head (&mdc800->write_wait);
 996         init_waitqueue_head (&mdc800->download_wait);
 997
 998         mdc800->irq_woken = 0;
 999         mdc800->downloaded = 0;
1000         mdc800->written = 0;
1001
1002         mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1003         if (!mdc800->irq_urb_buffer)
1004                 goto cleanup_on_fail;
1005         mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1006         if (!mdc800->write_urb_buffer)
1007                 goto cleanup_on_fail;
1008         mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1009         if (!mdc800->download_urb_buffer)
1010                 goto cleanup_on_fail;
1011
1012         mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1013         if (!mdc800->irq_urb)
1014                 goto cleanup_on_fail;
1015         mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1016         if (!mdc800->download_urb)
1017                 goto cleanup_on_fail;
1018         mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1019         if (!mdc800->write_urb)
1020                 goto cleanup_on_fail;
1021
1022         /* Register the driver */
1023         retval = usb_register(&mdc800_usb_driver);
1024         if (retval)
1025                 goto cleanup_on_fail;
1026
1027         info (DRIVER_VERSION ":" DRIVER_DESC);
1028
1029         return 0;
1030
1031         /* Clean driver up, when something fails */
1032
1033 cleanup_on_fail:
1034
1035         if (mdc800 != NULL)
1036         {
1037                 err ("can't alloc memory!");
1038
1039                 kfree(mdc800->download_urb_buffer);
1040                 kfree(mdc800->write_urb_buffer);
1041                 kfree(mdc800->irq_urb_buffer);
1042
1043                 usb_free_urb(mdc800->write_urb);
1044                 usb_free_urb(mdc800->download_urb);
1045                 usb_free_urb(mdc800->irq_urb);
1046
1047                 kfree (mdc800);
1048         }
1049         mdc800 = NULL;
1050         return retval;
1051 }
1052
1053
1054 static void __exit usb_mdc800_cleanup (void)
1055 {
1056         usb_deregister (&mdc800_usb_driver);
1057
1058         usb_free_urb (mdc800->irq_urb);
1059         usb_free_urb (mdc800->download_urb);
1060         usb_free_urb (mdc800->write_urb);
1061
1062         kfree (mdc800->irq_urb_buffer);
1063         kfree (mdc800->write_urb_buffer);
1064         kfree (mdc800->download_urb_buffer);
1065
1066         kfree (mdc800);
1067         mdc800 = NULL;
1068 }
1069
1070 module_init (usb_mdc800_init);
1071 module_exit (usb_mdc800_cleanup);
1072
1073 MODULE_AUTHOR( DRIVER_AUTHOR );
1074 MODULE_DESCRIPTION( DRIVER_DESC );
1075 MODULE_LICENSE("GPL");
1076