drivers/usb/image/mdc800.c

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