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                 dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n");
 359                 return -1;
 360         }
 361
 362         if (mdc800->state == NOT_CONNECTED)
 363         {
 364                 printk(KERN_WARNING "mdc800: Camera gets disconnected "
 365                        "during waiting for irq.\n");
 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         int status = urb->status;
 381
 382         if (status != 0)
 383                 dev_err(&mdc800->dev->dev,
 384                         "writing command fails (status=%i)\n", status);
 385         else
 386                 mdc800->state=READY;
 387         mdc800->written = 1;
 388         wake_up (&mdc800->write_wait);
 389 }
 390
 391
 392 /*
 393  * The download_urb callback function
 394  */
 395 static void mdc800_usb_download_notify (struct urb *urb)
 396 {
 397         struct mdc800_data* mdc800=urb->context;
 398         int status = urb->status;
 399
 400         if (status == 0) {
 401                 /* Fill output buffer with these data */
 402                 memcpy (mdc800->out,  urb->transfer_buffer, 64);
 403                 mdc800->out_count=64;
 404                 mdc800->out_ptr=0;
 405                 mdc800->download_left-=64;
 406                 if (mdc800->download_left == 0)
 407                 {
 408                         mdc800->state=READY;
 409                 }
 410         } else {
 411                 dev_err(&mdc800->dev->dev,
 412                         "request bytes fails (status:%i)\n", status);
 413         }
 414         mdc800->downloaded = 1;
 415         wake_up (&mdc800->download_wait);
 416 }
 417
 418
 419 /***************************************************************************
 420         Probing for the Camera
 421  ***************************************************************************/
 422
 423 static struct usb_driver mdc800_usb_driver;
 424 static const struct file_operations mdc800_device_ops;
 425 static struct usb_class_driver mdc800_class = {
 426         .name =         "mdc800%d",
 427         .fops =         &mdc800_device_ops,
 428         .minor_base =   MDC800_DEVICE_MINOR_BASE,
 429 };
 430
 431
 432 /*
 433  * Callback to search the Mustek MDC800 on the USB Bus
 434  */
 435 static int mdc800_usb_probe (struct usb_interface *intf,
 436                                const struct usb_device_id *id)
 437 {
 438         int i,j;
 439         struct usb_host_interface *intf_desc;
 440         struct usb_device *dev = interface_to_usbdev (intf);
 441         int irq_interval=0;
 442         int retval;
 443
 444         dbg ("(mdc800_usb_probe) called.");
 445
 446
 447         if (mdc800->dev != NULL)
 448         {
 449                 dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n");
 450                 return -ENODEV;
 451         }
 452
 453         if (dev->descriptor.bNumConfigurations != 1)
 454         {
 455                 dev_err(&intf->dev,
 456                         "probe fails -> wrong Number of Configuration\n");
 457                 return -ENODEV;
 458         }
 459         intf_desc = intf->cur_altsetting;
 460
 461         if (
 462                         ( intf_desc->desc.bInterfaceClass != 0xff )
 463                 ||      ( intf_desc->desc.bInterfaceSubClass != 0 )
 464                 || ( intf_desc->desc.bInterfaceProtocol != 0 )
 465                 || ( intf_desc->desc.bNumEndpoints != 4)
 466         )
 467         {
 468                 dev_err(&intf->dev, "probe fails -> wrong Interface\n");
 469                 return -ENODEV;
 470         }
 471
 472         /* Check the Endpoints */
 473         for (i=0; i<4; i++)
 474         {
 475                 mdc800->endpoint[i]=-1;
 476                 for (j=0; j<4; j++)
 477                 {
 478                         if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
 479                         {
 480                                 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
 481                                 if (i==1)
 482                                 {
 483                                         irq_interval=intf_desc->endpoint [j].desc.bInterval;
 484                                 }
 485                         }
 486                 }
 487                 if (mdc800->endpoint[i] == -1)
 488                 {
 489                         dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n");
 490                         return -ENODEV;
 491                 }
 492         }
 493
 494
 495         dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n");
 496
 497         mutex_lock(&mdc800->io_lock);
 498
 499         retval = usb_register_dev(intf, &mdc800_class);
 500         if (retval) {
 501                 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
 502                 return -ENODEV;
 503         }
 504
 505         mdc800->dev=dev;
 506         mdc800->open=0;
 507
 508         /* Setup URB Structs */
 509         usb_fill_int_urb (
 510                 mdc800->irq_urb,
 511                 mdc800->dev,
 512                 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
 513                 mdc800->irq_urb_buffer,
 514                 8,
 515                 mdc800_usb_irq,
 516                 mdc800,
 517                 irq_interval
 518         );
 519
 520         usb_fill_bulk_urb (
 521                 mdc800->write_urb,
 522                 mdc800->dev,
 523                 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
 524                 mdc800->write_urb_buffer,
 525                 8,
 526                 mdc800_usb_write_notify,
 527                 mdc800
 528         );
 529
 530         usb_fill_bulk_urb (
 531                 mdc800->download_urb,
 532                 mdc800->dev,
 533                 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
 534                 mdc800->download_urb_buffer,
 535                 64,
 536                 mdc800_usb_download_notify,
 537                 mdc800
 538         );
 539
 540         mdc800->state=READY;
 541
 542         mutex_unlock(&mdc800->io_lock);
 543
 544         usb_set_intfdata(intf, mdc800);
 545         return 0;
 546 }
 547
 548
 549 /*
 550  * Disconnect USB device (maybe the MDC800)
 551  */
 552 static void mdc800_usb_disconnect (struct usb_interface *intf)
 553 {
 554         struct mdc800_data* mdc800 = usb_get_intfdata(intf);
 555
 556         dbg ("(mdc800_usb_disconnect) called");
 557
 558         if (mdc800) {
 559                 if (mdc800->state == NOT_CONNECTED)
 560                         return;
 561
 562                 usb_deregister_dev(intf, &mdc800_class);
 563
 564                 /* must be under lock to make sure no URB
 565                    is submitted after usb_kill_urb() */
 566                 mutex_lock(&mdc800->io_lock);
 567                 mdc800->state=NOT_CONNECTED;
 568
 569                 usb_kill_urb(mdc800->irq_urb);
 570                 usb_kill_urb(mdc800->write_urb);
 571                 usb_kill_urb(mdc800->download_urb);
 572                 mutex_unlock(&mdc800->io_lock);
 573
 574                 mdc800->dev = NULL;
 575                 usb_set_intfdata(intf, NULL);
 576         }
 577         dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n");
 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         mutex_lock(&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         retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL);
 650         if (retval) {
 651                 dev_err(&mdc800->dev->dev,
 652                         "request USB irq fails (submit_retval=%i).\n", retval);
 653                 errn = -EIO;
 654                 goto error_out;
 655         }
 656
 657         mdc800->open=1;
 658         dbg ("Mustek MDC800 device opened.");
 659
 660 error_out:
 661         mutex_unlock(&mdc800->io_lock);
 662         return errn;
 663 }
 664
 665
 666 /*
 667  * Close the Camera and release Memory
 668  */
 669 static int mdc800_device_release (struct inode* inode, struct file *file)
 670 {
 671         int retval=0;
 672         dbg ("Mustek MDC800 device closed.");
 673
 674         mutex_lock(&mdc800->io_lock);
 675         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
 676         {
 677                 usb_kill_urb(mdc800->irq_urb);
 678                 usb_kill_urb(mdc800->write_urb);
 679                 usb_kill_urb(mdc800->download_urb);
 680                 mdc800->open=0;
 681         }
 682         else
 683         {
 684                 retval=-EIO;
 685         }
 686
 687         mutex_unlock(&mdc800->io_lock);
 688         return retval;
 689 }
 690
 691
 692 /*
 693  * The Device read callback Function
 694  */
 695 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
 696 {
 697         size_t left=len, sts=len; /* single transfer size */
 698         char __user *ptr = buf;
 699         int retval;
 700
 701         mutex_lock(&mdc800->io_lock);
 702         if (mdc800->state == NOT_CONNECTED)
 703         {
 704                 mutex_unlock(&mdc800->io_lock);
 705                 return -EBUSY;
 706         }
 707         if (mdc800->state == WORKING)
 708         {
 709                 printk(KERN_WARNING "mdc800: Illegal State \"working\""
 710                        "reached during read ?!\n");
 711                 mutex_unlock(&mdc800->io_lock);
 712                 return -EBUSY;
 713         }
 714         if (!mdc800->open)
 715         {
 716                 mutex_unlock(&mdc800->io_lock);
 717                 return -EBUSY;
 718         }
 719
 720         while (left)
 721         {
 722                 if (signal_pending (current))
 723                 {
 724                         mutex_unlock(&mdc800->io_lock);
 725                         return -EINTR;
 726                 }
 727
 728                 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
 729
 730                 if (sts <= 0)
 731                 {
 732                         /* Too less Data in buffer */
 733                         if (mdc800->state == DOWNLOAD)
 734                         {
 735                                 mdc800->out_count=0;
 736                                 mdc800->out_ptr=0;
 737
 738                                 /* Download -> Request new bytes */
 739                                 mdc800->download_urb->dev = mdc800->dev;
 740                                 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL);
 741                                 if (retval) {
 742                                         dev_err(&mdc800->dev->dev,
 743                                                 "Can't submit download urb "
 744                                                 "(retval=%i)\n", retval);
 745                                         mutex_unlock(&mdc800->io_lock);
 746                                         return len-left;
 747                                 }
 748                                 wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
 749                                                                                 TO_DOWNLOAD_GET_READY*HZ/1000);
 750                                 mdc800->downloaded = 0;
 751                                 if (mdc800->download_urb->status != 0)
 752                                 {
 753                                         dev_err(&mdc800->dev->dev,
 754                                                 "request download-bytes fails "
 755                                                 "(status=%i)\n",
 756                                                 mdc800->download_urb->status);
 757                                         mutex_unlock(&mdc800->io_lock);
 758                                         return len-left;
 759                                 }
 760                         }
 761                         else
 762                         {
 763                                 /* No more bytes -> that's an error*/
 764                                 mutex_unlock(&mdc800->io_lock);
 765                                 return -EIO;
 766                         }
 767                 }
 768                 else
 769                 {
 770                         /* Copy Bytes */
 771                         if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
 772                                                 sts)) {
 773                                 mutex_unlock(&mdc800->io_lock);
 774                                 return -EFAULT;
 775                         }
 776                         ptr+=sts;
 777                         left-=sts;
 778                         mdc800->out_ptr+=sts;
 779                 }
 780         }
 781
 782         mutex_unlock(&mdc800->io_lock);
 783         return len-left;
 784 }
 785
 786
 787 /*
 788  * The Device write callback Function
 789  * If a 8Byte Command is received, it will be send to the camera.
 790  * After this the driver initiates the request for the answer or
 791  * just waits until the camera becomes ready.
 792  */
 793 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
 794 {
 795         size_t i=0;
 796         int retval;
 797
 798         mutex_lock(&mdc800->io_lock);
 799         if (mdc800->state != READY)
 800         {
 801                 mutex_unlock(&mdc800->io_lock);
 802                 return -EBUSY;
 803         }
 804         if (!mdc800->open )
 805         {
 806                 mutex_unlock(&mdc800->io_lock);
 807                 return -EBUSY;
 808         }
 809
 810         while (i<len)
 811         {
 812                 unsigned char c;
 813                 if (signal_pending (current))
 814                 {
 815                         mutex_unlock(&mdc800->io_lock);
 816                         return -EINTR;
 817                 }
 818
 819                 if(get_user(c, buf+i))
 820                 {
 821                         mutex_unlock(&mdc800->io_lock);
 822                         return -EFAULT;
 823                 }
 824
 825                 /* check for command start */
 826                 if (c == 0x55)
 827                 {
 828                         mdc800->in_count=0;
 829                         mdc800->out_count=0;
 830                         mdc800->out_ptr=0;
 831                         mdc800->download_left=0;
 832                 }
 833
 834                 /* save command byte */
 835                 if (mdc800->in_count < 8)
 836                 {
 837                         mdc800->in[mdc800->in_count] = c;
 838                         mdc800->in_count++;
 839                 }
 840                 else
 841                 {
 842                         mutex_unlock(&mdc800->io_lock);
 843                         return -EIO;
 844                 }
 845
 846                 /* Command Buffer full ? -> send it to camera */
 847                 if (mdc800->in_count == 8)
 848                 {
 849                         int answersize;
 850
 851                         if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
 852                         {
 853                                 dev_err(&mdc800->dev->dev,
 854                                         "Camera didn't get ready.\n");
 855                                 mutex_unlock(&mdc800->io_lock);
 856                                 return -EIO;
 857                         }
 858
 859                         answersize=mdc800_getAnswerSize (mdc800->in[1]);
 860
 861                         mdc800->state=WORKING;
 862                         memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
 863                         mdc800->write_urb->dev = mdc800->dev;
 864                         retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL);
 865                         if (retval) {
 866                                 dev_err(&mdc800->dev->dev,
 867                                         "submitting write urb fails "
 868                                         "(retval=%i)\n", retval);
 869                                 mutex_unlock(&mdc800->io_lock);
 870                                 return -EIO;
 871                         }
 872                         wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
 873                         mdc800->written = 0;
 874                         if (mdc800->state == WORKING)
 875                         {
 876                                 usb_kill_urb(mdc800->write_urb);
 877                                 mutex_unlock(&mdc800->io_lock);
 878                                 return -EIO;
 879                         }
 880
 881                         switch ((unsigned char) mdc800->in[1])
 882                         {
 883                                 case 0x05: /* Download Image */
 884                                 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
 885                                         if (mdc800->pic_len < 0)
 886                                         {
 887                                                 dev_err(&mdc800->dev->dev,
 888                                                         "call 0x07 before "
 889                                                         "0x05,0x3e\n");
 890                                                 mdc800->state=READY;
 891                                                 mutex_unlock(&mdc800->io_lock);
 892                                                 return -EIO;
 893                                         }
 894                                         mdc800->pic_len=-1;
 895
 896                                 case 0x09: /* Download Thumbnail */
 897                                         mdc800->download_left=answersize+64;
 898                                         mdc800->state=DOWNLOAD;
 899                                         mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
 900                                         break;
 901
 902
 903                                 default:
 904                                         if (answersize)
 905                                         {
 906
 907                                                 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
 908                                                 {
 909                                                         dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n");
 910                                                         mutex_unlock(&mdc800->io_lock);
 911                                                         return -EIO;
 912                                                 }
 913
 914                                                 /* Write dummy data, (this is ugly but part of the USB Protocol */
 915                                                 /* if you use endpoint 1 as bulk and not as irq) */
 916                                                 memcpy (mdc800->out, mdc800->camera_response,8);
 917
 918                                                 /* This is the interpreted answer */
 919                                                 memcpy (&mdc800->out[8], mdc800->camera_response,8);
 920
 921                                                 mdc800->out_ptr=0;
 922                                                 mdc800->out_count=16;
 923
 924                                                 /* Cache the Imagesize, if command was getImageSize */
 925                                                 if (mdc800->in [1] == (char) 0x07)
 926                                                 {
 927                                                         mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
 928
 929                                                         dbg ("cached imagesize = %i",mdc800->pic_len);
 930                                                 }
 931
 932                                         }
 933                                         else
 934                                         {
 935                                                 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
 936                                                 {
 937                                                         dev_err(&mdc800->dev->dev, "Command Timeout.\n");
 938                                                         mutex_unlock(&mdc800->io_lock);
 939                                                         return -EIO;
 940                                                 }
 941                                         }
 942                                         mdc800->state=READY;
 943                                         break;
 944                         }
 945                 }
 946                 i++;
 947         }
 948         mutex_unlock(&mdc800->io_lock);
 949         return i;
 950 }
 951
 952
 953 /***************************************************************************
 954         Init and Cleanup this driver (Structs and types)
 955 ****************************************************************************/
 956
 957 /* File Operations of this drivers */
 958 static const struct file_operations mdc800_device_ops =
 959 {
 960         .owner =        THIS_MODULE,
 961         .read =         mdc800_device_read,
 962         .write =        mdc800_device_write,
 963         .open =         mdc800_device_open,
 964         .release =      mdc800_device_release,
 965 };
 966
 967
 968
 969 static struct usb_device_id mdc800_table [] = {
 970         { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
 971         { }                                             /* Terminating entry */
 972 };
 973
 974 MODULE_DEVICE_TABLE (usb, mdc800_table);
 975 /*
 976  * USB Driver Struct for this device
 977  */
 978 static struct usb_driver mdc800_usb_driver =
 979 {
 980         .name =         "mdc800",
 981         .probe =        mdc800_usb_probe,
 982         .disconnect =   mdc800_usb_disconnect,
 983         .id_table =     mdc800_table
 984 };
 985
 986
 987
 988 /************************************************************************
 989         Init and Cleanup this driver (Main Functions)
 990 *************************************************************************/
 991
 992 static int __init usb_mdc800_init (void)
 993 {
 994         int retval = -ENODEV;
 995         /* Allocate Memory */
 996         mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
 997         if (!mdc800)
 998                 goto cleanup_on_fail;
 999
1000         mdc800->dev = NULL;
1001         mdc800->state=NOT_CONNECTED;
1002         mutex_init (&mdc800->io_lock);
1003
1004         init_waitqueue_head (&mdc800->irq_wait);
1005         init_waitqueue_head (&mdc800->write_wait);
1006         init_waitqueue_head (&mdc800->download_wait);
1007
1008         mdc800->irq_woken = 0;
1009         mdc800->downloaded = 0;
1010         mdc800->written = 0;
1011
1012         mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1013         if (!mdc800->irq_urb_buffer)
1014                 goto cleanup_on_fail;
1015         mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1016         if (!mdc800->write_urb_buffer)
1017                 goto cleanup_on_fail;
1018         mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1019         if (!mdc800->download_urb_buffer)
1020                 goto cleanup_on_fail;
1021
1022         mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1023         if (!mdc800->irq_urb)
1024                 goto cleanup_on_fail;
1025         mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1026         if (!mdc800->download_urb)
1027                 goto cleanup_on_fail;
1028         mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1029         if (!mdc800->write_urb)
1030                 goto cleanup_on_fail;
1031
1032         /* Register the driver */
1033         retval = usb_register(&mdc800_usb_driver);
1034         if (retval)
1035                 goto cleanup_on_fail;
1036
1037         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1038                DRIVER_DESC "\n");
1039
1040         return 0;
1041
1042         /* Clean driver up, when something fails */
1043
1044 cleanup_on_fail:
1045
1046         if (mdc800 != NULL)
1047         {
1048                 printk(KERN_ERR "mdc800: can't alloc memory!\n");
1049
1050                 kfree(mdc800->download_urb_buffer);
1051                 kfree(mdc800->write_urb_buffer);
1052                 kfree(mdc800->irq_urb_buffer);
1053
1054                 usb_free_urb(mdc800->write_urb);
1055                 usb_free_urb(mdc800->download_urb);
1056                 usb_free_urb(mdc800->irq_urb);
1057
1058                 kfree (mdc800);
1059         }
1060         mdc800 = NULL;
1061         return retval;
1062 }
1063
1064
1065 static void __exit usb_mdc800_cleanup (void)
1066 {
1067         usb_deregister (&mdc800_usb_driver);
1068
1069         usb_free_urb (mdc800->irq_urb);
1070         usb_free_urb (mdc800->download_urb);
1071         usb_free_urb (mdc800->write_urb);
1072
1073         kfree (mdc800->irq_urb_buffer);
1074         kfree (mdc800->write_urb_buffer);
1075         kfree (mdc800->download_urb_buffer);
1076
1077         kfree (mdc800);
1078         mdc800 = NULL;
1079 }
1080
1081 module_init (usb_mdc800_init);
1082 module_exit (usb_mdc800_cleanup);
1083
1084 MODULE_AUTHOR( DRIVER_AUTHOR );
1085 MODULE_DESCRIPTION( DRIVER_DESC );
1086 MODULE_LICENSE("GPL");
1087