git.oblomov.eu Git - linux-2.6/blob - 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/smp_lock.h>
  98 #include <linux/wait.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 semaphore        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, struct pt_regs *res)
 283 {
 284         int data_received=0, wake_up;
 285         unsigned char* b=urb->transfer_buffer;
 286         struct mdc800_data* mdc800=urb->context;
 287
 288         if (urb->status >= 0)
 289         {
 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                         (urb->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, struct pt_regs *res)
 377 {
 378         struct mdc800_data* mdc800=urb->context;
 379
 380         if (urb->status != 0)
 381         {
 382                 err ("writing command fails (status=%i)", urb->status);
 383         }
 384         else
 385         {
 386                 mdc800->state=READY;
 387         }
 388         mdc800->written = 1;
 389         wake_up (&mdc800->write_wait);
 390 }
 391
 392
 393 /*
 394  * The download_urb callback function
 395  */
 396 static void mdc800_usb_download_notify (struct urb *urb, struct pt_regs *res)
 397 {
 398         struct mdc800_data* mdc800=urb->context;
 399
 400         if (urb->status == 0)
 401         {
 402                 /* Fill output buffer with these data */
 403                 memcpy (mdc800->out,  urb->transfer_buffer, 64);
 404                 mdc800->out_count=64;
 405                 mdc800->out_ptr=0;
 406                 mdc800->download_left-=64;
 407                 if (mdc800->download_left == 0)
 408                 {
 409                         mdc800->state=READY;
 410                 }
 411         }
 412         else
 413         {
 414                 err ("request bytes fails (status:%i)", urb->status);
 415         }
 416         mdc800->downloaded = 1;
 417         wake_up (&mdc800->download_wait);
 418 }
 419
 420
 421 /***************************************************************************
 422         Probing for the Camera
 423  ***************************************************************************/
 424
 425 static struct usb_driver mdc800_usb_driver;
 426 static struct file_operations mdc800_device_ops;
 427 static struct usb_class_driver mdc800_class = {
 428         .name =         "usb/mdc800%d",
 429         .fops =         &mdc800_device_ops,
 430         .mode =         S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 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         down (&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         up (&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                 mdc800->state=NOT_CONNECTED;
 569
 570                 usb_kill_urb(mdc800->irq_urb);
 571                 usb_kill_urb(mdc800->write_urb);
 572                 usb_kill_urb(mdc800->download_urb);
 573
 574                 mdc800->dev = NULL;
 575                 usb_set_intfdata(intf, NULL);
 576         }
 577         info ("Mustek MDC800 disconnected from USB.");
 578 }
 579
 580
 581 /***************************************************************************
 582         The Misc device Part (file_operations)
 583 ****************************************************************************/
 584
 585 /*
 586  * This Function calc the Answersize for a command.
 587  */
 588 static int mdc800_getAnswerSize (char command)
 589 {
 590         switch ((unsigned char) command)
 591         {
 592                 case 0x2a:
 593                 case 0x49:
 594                 case 0x51:
 595                 case 0x0d:
 596                 case 0x20:
 597                 case 0x07:
 598                 case 0x01:
 599                 case 0x25:
 600                 case 0x00:
 601                         return 8;
 602
 603                 case 0x05:
 604                 case 0x3e:
 605                         return mdc800->pic_len;
 606
 607                 case 0x09:
 608                         return 4096;
 609
 610                 default:
 611                         return 0;
 612         }
 613 }
 614
 615
 616 /*
 617  * Init the device: (1) alloc mem (2) Increase MOD Count ..
 618  */
 619 static int mdc800_device_open (struct inode* inode, struct file *file)
 620 {
 621         int retval=0;
 622         int errn=0;
 623
 624         down (&mdc800->io_lock);
 625
 626         if (mdc800->state == NOT_CONNECTED)
 627         {
 628                 errn=-EBUSY;
 629                 goto error_out;
 630         }
 631         if (mdc800->open)
 632         {
 633                 errn=-EBUSY;
 634                 goto error_out;
 635         }
 636
 637         mdc800->in_count=0;
 638         mdc800->out_count=0;
 639         mdc800->out_ptr=0;
 640         mdc800->pic_index=0;
 641         mdc800->pic_len=-1;
 642         mdc800->download_left=0;
 643
 644         mdc800->camera_busy=0;
 645         mdc800->camera_request_ready=0;
 646
 647         retval=0;
 648         mdc800->irq_urb->dev = mdc800->dev;
 649         if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
 650         {
 651                 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
 652                 errn = -EIO;
 653                 goto error_out;
 654         }
 655
 656         mdc800->open=1;
 657         dbg ("Mustek MDC800 device opened.");
 658
 659 error_out:
 660         up (&mdc800->io_lock);
 661         return errn;
 662 }
 663
 664
 665 /*
 666  * Close the Camera and release Memory
 667  */
 668 static int mdc800_device_release (struct inode* inode, struct file *file)
 669 {
 670         int retval=0;
 671         dbg ("Mustek MDC800 device closed.");
 672
 673         down (&mdc800->io_lock);
 674         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
 675         {
 676                 usb_kill_urb(mdc800->irq_urb);
 677                 usb_kill_urb(mdc800->write_urb);
 678                 usb_kill_urb(mdc800->download_urb);
 679                 mdc800->open=0;
 680         }
 681         else
 682         {
 683                 retval=-EIO;
 684         }
 685
 686         up(&mdc800->io_lock);
 687         return retval;
 688 }
 689
 690
 691 /*
 692  * The Device read callback Function
 693  */
 694 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
 695 {
 696         size_t left=len, sts=len; /* single transfer size */
 697         char __user *ptr = buf;
 698
 699         down (&mdc800->io_lock);
 700         if (mdc800->state == NOT_CONNECTED)
 701         {
 702                 up (&mdc800->io_lock);
 703                 return -EBUSY;
 704         }
 705         if (mdc800->state == WORKING)
 706         {
 707                 warn ("Illegal State \"working\" reached during read ?!");
 708                 up (&mdc800->io_lock);
 709                 return -EBUSY;
 710         }
 711         if (!mdc800->open)
 712         {
 713                 up (&mdc800->io_lock);
 714                 return -EBUSY;
 715         }
 716
 717         while (left)
 718         {
 719                 if (signal_pending (current))
 720                 {
 721                         up (&mdc800->io_lock);
 722                         return -EINTR;
 723                 }
 724
 725                 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
 726
 727                 if (sts <= 0)
 728                 {
 729                         /* Too less Data in buffer */
 730                         if (mdc800->state == DOWNLOAD)
 731                         {
 732                                 mdc800->out_count=0;
 733                                 mdc800->out_ptr=0;
 734
 735                                 /* Download -> Request new bytes */
 736                                 mdc800->download_urb->dev = mdc800->dev;
 737                                 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
 738                                 {
 739                                         err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
 740                                         up (&mdc800->io_lock);
 741                                         return len-left;
 742                                 }
 743                                 wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
 744                                                                                 TO_DOWNLOAD_GET_READY*HZ/1000);
 745                                 mdc800->downloaded = 0;
 746                                 if (mdc800->download_urb->status != 0)
 747                                 {
 748                                         err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
 749                                         up (&mdc800->io_lock);
 750                                         return len-left;
 751                                 }
 752                         }
 753                         else
 754                         {
 755                                 /* No more bytes -> that's an error*/
 756                                 up (&mdc800->io_lock);
 757                                 return -EIO;
 758                         }
 759                 }
 760                 else
 761                 {
 762                         /* Copy Bytes */
 763                         if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
 764                                                 sts)) {
 765                                 up(&mdc800->io_lock);
 766                                 return -EFAULT;
 767                         }
 768                         ptr+=sts;
 769                         left-=sts;
 770                         mdc800->out_ptr+=sts;
 771                 }
 772         }
 773
 774         up (&mdc800->io_lock);
 775         return len-left;
 776 }
 777
 778
 779 /*
 780  * The Device write callback Function
 781  * If a 8Byte Command is received, it will be send to the camera.
 782  * After this the driver initiates the request for the answer or
 783  * just waits until the camera becomes ready.
 784  */
 785 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
 786 {
 787         size_t i=0;
 788
 789         down (&mdc800->io_lock);
 790         if (mdc800->state != READY)
 791         {
 792                 up (&mdc800->io_lock);
 793                 return -EBUSY;
 794         }
 795         if (!mdc800->open )
 796         {
 797                 up (&mdc800->io_lock);
 798                 return -EBUSY;
 799         }
 800
 801         while (i<len)
 802         {
 803                 unsigned char c;
 804                 if (signal_pending (current))
 805                 {
 806                         up (&mdc800->io_lock);
 807                         return -EINTR;
 808                 }
 809
 810                 if(get_user(c, buf+i))
 811                 {
 812                         up(&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                         up (&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                                 up (&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                         if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
 855                         {
 856                                 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
 857                                 up (&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                                 up (&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                                                 up (&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                                                         up (&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                                                         up (&mdc800->io_lock);
 925                                                         return -EIO;
 926                                                 }
 927                                         }
 928                                         mdc800->state=READY;
 929                                         break;
 930                         }
 931                 }
 932                 i++;
 933         }
 934         up (&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 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         .owner =        THIS_MODULE,
 967         .name =         "mdc800",
 968         .probe =        mdc800_usb_probe,
 969         .disconnect =   mdc800_usb_disconnect,
 970         .id_table =     mdc800_table
 971 };
 972
 973
 974
 975 /************************************************************************
 976         Init and Cleanup this driver (Main Functions)
 977 *************************************************************************/
 978
 979 #define try(A)           if (!(A)) goto cleanup_on_fail;
 980
 981 static int __init usb_mdc800_init (void)
 982 {
 983         int retval = -ENODEV;
 984         /* Allocate Memory */
 985         try (mdc800=kmalloc (sizeof (struct mdc800_data), GFP_KERNEL));
 986
 987         memset(mdc800, 0, sizeof(struct mdc800_data));
 988         mdc800->dev = NULL;
 989         mdc800->open=0;
 990         mdc800->state=NOT_CONNECTED;
 991         init_MUTEX (&mdc800->io_lock);
 992
 993         init_waitqueue_head (&mdc800->irq_wait);
 994         init_waitqueue_head (&mdc800->write_wait);
 995         init_waitqueue_head (&mdc800->download_wait);
 996
 997         mdc800->irq_woken = 0;
 998         mdc800->downloaded = 0;
 999         mdc800->written = 0;
1000
1001         try (mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL));
1002         try (mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL));
1003         try (mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL));
1004
1005         try (mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL));
1006         try (mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL));
1007         try (mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL));
1008
1009         /* Register the driver */
1010         retval = usb_register(&mdc800_usb_driver);
1011         if (retval)
1012                 goto cleanup_on_fail;
1013
1014         info (DRIVER_VERSION ":" DRIVER_DESC);
1015
1016         return 0;
1017
1018         /* Clean driver up, when something fails */
1019
1020 cleanup_on_fail:
1021
1022         if (mdc800 != NULL)
1023         {
1024                 err ("can't alloc memory!");
1025
1026                 kfree(mdc800->download_urb_buffer);
1027                 kfree(mdc800->write_urb_buffer);
1028                 kfree(mdc800->irq_urb_buffer);
1029
1030                 usb_free_urb(mdc800->write_urb);
1031                 usb_free_urb(mdc800->download_urb);
1032                 usb_free_urb(mdc800->irq_urb);
1033
1034                 kfree (mdc800);
1035         }
1036         mdc800 = NULL;
1037         return retval;
1038 }
1039
1040
1041 static void __exit usb_mdc800_cleanup (void)
1042 {
1043         usb_deregister (&mdc800_usb_driver);
1044
1045         usb_free_urb (mdc800->irq_urb);
1046         usb_free_urb (mdc800->download_urb);
1047         usb_free_urb (mdc800->write_urb);
1048
1049         kfree (mdc800->irq_urb_buffer);
1050         kfree (mdc800->write_urb_buffer);
1051         kfree (mdc800->download_urb_buffer);
1052
1053         kfree (mdc800);
1054         mdc800 = NULL;
1055 }
1056
1057 module_init (usb_mdc800_init);
1058 module_exit (usb_mdc800_cleanup);
1059
1060 MODULE_AUTHOR( DRIVER_AUTHOR );
1061 MODULE_DESCRIPTION( DRIVER_DESC );
1062 MODULE_LICENSE("GPL");
1063