1d973bcf56aa983659938665573ca51c5be60100
[linux-2.6.git] / 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 =         "mdc800%d",
429         .fops =         &mdc800_device_ops,
430         .minor_base =   MDC800_DEVICE_MINOR_BASE,
431 };
432
433
434 /*
435  * Callback to search the Mustek MDC800 on the USB Bus
436  */
437 static int mdc800_usb_probe (struct usb_interface *intf,
438                                const struct usb_device_id *id)
439 {
440         int i,j;
441         struct usb_host_interface *intf_desc;
442         struct usb_device *dev = interface_to_usbdev (intf);
443         int irq_interval=0;
444         int retval;
445
446         dbg ("(mdc800_usb_probe) called.");
447
448
449         if (mdc800->dev != NULL)
450         {
451                 warn ("only one Mustek MDC800 is supported.");
452                 return -ENODEV;
453         }
454
455         if (dev->descriptor.bNumConfigurations != 1)
456         {
457                 err ("probe fails -> wrong Number of Configuration");
458                 return -ENODEV;
459         }
460         intf_desc = intf->cur_altsetting;
461
462         if (
463                         ( intf_desc->desc.bInterfaceClass != 0xff )
464                 ||      ( intf_desc->desc.bInterfaceSubClass != 0 )
465                 || ( intf_desc->desc.bInterfaceProtocol != 0 )
466                 || ( intf_desc->desc.bNumEndpoints != 4)
467         )
468         {
469                 err ("probe fails -> wrong Interface");
470                 return -ENODEV;
471         }
472
473         /* Check the Endpoints */
474         for (i=0; i<4; i++)
475         {
476                 mdc800->endpoint[i]=-1;
477                 for (j=0; j<4; j++)
478                 {
479                         if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
480                         {
481                                 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
482                                 if (i==1)
483                                 {
484                                         irq_interval=intf_desc->endpoint [j].desc.bInterval;
485                                 }
486
487                                 continue;
488                         }
489                 }
490                 if (mdc800->endpoint[i] == -1)
491                 {
492                         err ("probe fails -> Wrong Endpoints.");
493                         return -ENODEV;
494                 }
495         }
496
497
498         info ("Found Mustek MDC800 on USB.");
499
500         down (&mdc800->io_lock);
501
502         retval = usb_register_dev(intf, &mdc800_class);
503         if (retval) {
504                 err ("Not able to get a minor for this device.");
505                 return -ENODEV;
506         }
507
508         mdc800->dev=dev;
509         mdc800->open=0;
510
511         /* Setup URB Structs */
512         usb_fill_int_urb (
513                 mdc800->irq_urb,
514                 mdc800->dev,
515                 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
516                 mdc800->irq_urb_buffer,
517                 8,
518                 mdc800_usb_irq,
519                 mdc800,
520                 irq_interval
521         );
522
523         usb_fill_bulk_urb (
524                 mdc800->write_urb,
525                 mdc800->dev,
526                 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
527                 mdc800->write_urb_buffer,
528                 8,
529                 mdc800_usb_write_notify,
530                 mdc800
531         );
532
533         usb_fill_bulk_urb (
534                 mdc800->download_urb,
535                 mdc800->dev,
536                 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
537                 mdc800->download_urb_buffer,
538                 64,
539                 mdc800_usb_download_notify,
540                 mdc800
541         );
542
543         mdc800->state=READY;
544
545         up (&mdc800->io_lock);
546         
547         usb_set_intfdata(intf, mdc800);
548         return 0;
549 }
550
551
552 /*
553  * Disconnect USB device (maybe the MDC800)
554  */
555 static void mdc800_usb_disconnect (struct usb_interface *intf)
556 {
557         struct mdc800_data* mdc800 = usb_get_intfdata(intf);
558
559         dbg ("(mdc800_usb_disconnect) called");
560
561         if (mdc800) {
562                 if (mdc800->state == NOT_CONNECTED)
563                         return;
564
565                 usb_deregister_dev(intf, &mdc800_class);
566
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
573                 mdc800->dev = NULL;
574                 usb_set_intfdata(intf, NULL);
575         }
576         info ("Mustek MDC800 disconnected from USB.");
577 }
578
579
580 /***************************************************************************
581         The Misc device Part (file_operations)
582 ****************************************************************************/
583
584 /*
585  * This Function calc the Answersize for a command.
586  */
587 static int mdc800_getAnswerSize (char command)
588 {
589         switch ((unsigned char) command)
590         {
591                 case 0x2a:
592                 case 0x49:
593                 case 0x51:
594                 case 0x0d:
595                 case 0x20:
596                 case 0x07:
597                 case 0x01:
598                 case 0x25:
599                 case 0x00:
600                         return 8;
601
602                 case 0x05:
603                 case 0x3e:
604                         return mdc800->pic_len;
605
606                 case 0x09:
607                         return 4096;
608
609                 default:
610                         return 0;
611         }
612 }
613
614
615 /*
616  * Init the device: (1) alloc mem (2) Increase MOD Count ..
617  */
618 static int mdc800_device_open (struct inode* inode, struct file *file)
619 {
620         int retval=0;
621         int errn=0;
622
623         down (&mdc800->io_lock);
624         
625         if (mdc800->state == NOT_CONNECTED)
626         {
627                 errn=-EBUSY;
628                 goto error_out;
629         }
630         if (mdc800->open)
631         {
632                 errn=-EBUSY;
633                 goto error_out;
634         }
635
636         mdc800->in_count=0;
637         mdc800->out_count=0;
638         mdc800->out_ptr=0;
639         mdc800->pic_index=0;
640         mdc800->pic_len=-1;
641         mdc800->download_left=0;
642
643         mdc800->camera_busy=0;
644         mdc800->camera_request_ready=0;
645
646         retval=0;
647         mdc800->irq_urb->dev = mdc800->dev;
648         if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
649         {
650                 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
651                 errn = -EIO;
652                 goto error_out;
653         }
654
655         mdc800->open=1;
656         dbg ("Mustek MDC800 device opened.");
657
658 error_out:
659         up (&mdc800->io_lock);
660         return errn;
661 }
662
663
664 /*
665  * Close the Camera and release Memory
666  */
667 static int mdc800_device_release (struct inode* inode, struct file *file)
668 {
669         int retval=0;
670         dbg ("Mustek MDC800 device closed.");
671
672         down (&mdc800->io_lock);
673         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
674         {
675                 usb_kill_urb(mdc800->irq_urb);
676                 usb_kill_urb(mdc800->write_urb);
677                 usb_kill_urb(mdc800->download_urb);
678                 mdc800->open=0;
679         }
680         else
681         {
682                 retval=-EIO;
683         }
684
685         up(&mdc800->io_lock);
686         return retval;
687 }
688
689
690 /*
691  * The Device read callback Function
692  */
693 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
694 {
695         size_t left=len, sts=len; /* single transfer size */
696         char __user *ptr = buf;
697
698         down (&mdc800->io_lock);
699         if (mdc800->state == NOT_CONNECTED)
700         {
701                 up (&mdc800->io_lock);
702                 return -EBUSY;
703         }
704         if (mdc800->state == WORKING)
705         {
706                 warn ("Illegal State \"working\" reached during read ?!");
707                 up (&mdc800->io_lock);
708                 return -EBUSY;
709         }
710         if (!mdc800->open)
711         {
712                 up (&mdc800->io_lock);
713                 return -EBUSY;
714         }
715
716         while (left)
717         {
718                 if (signal_pending (current)) 
719                 {
720                         up (&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                                 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
737                                 {
738                                         err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
739                                         up (&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                                         up (&mdc800->io_lock);
749                                         return len-left;
750                                 }
751                         }
752                         else
753                         {
754                                 /* No more bytes -> that's an error*/
755                                 up (&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                                 up(&mdc800->io_lock);
765                                 return -EFAULT;
766                         }
767                         ptr+=sts;
768                         left-=sts;
769                         mdc800->out_ptr+=sts;
770                 }
771         }
772
773         up (&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
788         down (&mdc800->io_lock);
789         if (mdc800->state != READY)
790         {
791                 up (&mdc800->io_lock);
792                 return -EBUSY;
793         }
794         if (!mdc800->open )
795         {
796                 up (&mdc800->io_lock);
797                 return -EBUSY;
798         }
799
800         while (i<len)
801         {
802                 unsigned char c;
803                 if (signal_pending (current)) 
804                 {
805                         up (&mdc800->io_lock);
806                         return -EINTR;
807                 }
808                 
809                 if(get_user(c, buf+i))
810                 {
811                         up(&mdc800->io_lock);
812                         return -EFAULT;
813                 }
814
815                 /* check for command start */
816                 if (c == 0x55)
817                 {
818                         mdc800->in_count=0;
819                         mdc800->out_count=0;
820                         mdc800->out_ptr=0;
821                         mdc800->download_left=0;
822                 }
823
824                 /* save command byte */
825                 if (mdc800->in_count < 8)
826                 {
827                         mdc800->in[mdc800->in_count] = c;
828                         mdc800->in_count++;
829                 }
830                 else
831                 {
832                         up (&mdc800->io_lock);
833                         return -EIO;
834                 }
835
836                 /* Command Buffer full ? -> send it to camera */
837                 if (mdc800->in_count == 8)
838                 {
839                         int answersize;
840
841                         if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
842                         {
843                                 err ("Camera didn't get ready.\n");
844                                 up (&mdc800->io_lock);
845                                 return -EIO;
846                         }
847
848                         answersize=mdc800_getAnswerSize (mdc800->in[1]);
849
850                         mdc800->state=WORKING;
851                         memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
852                         mdc800->write_urb->dev = mdc800->dev;
853                         if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
854                         {
855                                 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
856                                 up (&mdc800->io_lock);
857                                 return -EIO;
858                         }
859                         wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
860                         mdc800->written = 0;
861                         if (mdc800->state == WORKING)
862                         {
863                                 usb_kill_urb(mdc800->write_urb);
864                                 up (&mdc800->io_lock);
865                                 return -EIO;
866                         }
867
868                         switch ((unsigned char) mdc800->in[1])
869                         {
870                                 case 0x05: /* Download Image */
871                                 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
872                                         if (mdc800->pic_len < 0)
873                                         {
874                                                 err ("call 0x07 before 0x05,0x3e");
875                                                 mdc800->state=READY;
876                                                 up (&mdc800->io_lock);
877                                                 return -EIO;
878                                         }
879                                         mdc800->pic_len=-1;
880
881                                 case 0x09: /* Download Thumbnail */
882                                         mdc800->download_left=answersize+64;
883                                         mdc800->state=DOWNLOAD;
884                                         mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
885                                         break;
886
887
888                                 default:
889                                         if (answersize)
890                                         {
891
892                                                 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
893                                                 {
894                                                         err ("requesting answer from irq fails");
895                                                         up (&mdc800->io_lock);
896                                                         return -EIO;
897                                                 }
898
899                                                 /* Write dummy data, (this is ugly but part of the USB Protocol */
900                                                 /* if you use endpoint 1 as bulk and not as irq) */
901                                                 memcpy (mdc800->out, mdc800->camera_response,8);
902
903                                                 /* This is the interpreted answer */
904                                                 memcpy (&mdc800->out[8], mdc800->camera_response,8);
905
906                                                 mdc800->out_ptr=0;
907                                                 mdc800->out_count=16;
908
909                                                 /* Cache the Imagesize, if command was getImageSize */
910                                                 if (mdc800->in [1] == (char) 0x07)
911                                                 {
912                                                         mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
913
914                                                         dbg ("cached imagesize = %i",mdc800->pic_len);
915                                                 }
916
917                                         }
918                                         else
919                                         {
920                                                 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
921                                                 {
922                                                         err ("Command Timeout.");
923                                                         up (&mdc800->io_lock);
924                                                         return -EIO;
925                                                 }
926                                         }
927                                         mdc800->state=READY;
928                                         break;
929                         }
930                 }
931                 i++;
932         }
933         up (&mdc800->io_lock);
934         return i;
935 }
936
937
938 /***************************************************************************
939         Init and Cleanup this driver (Structs and types)
940 ****************************************************************************/
941
942 /* File Operations of this drivers */
943 static struct file_operations mdc800_device_ops =
944 {
945         .owner =        THIS_MODULE,
946         .read =         mdc800_device_read,
947         .write =        mdc800_device_write,
948         .open =         mdc800_device_open,
949         .release =      mdc800_device_release,
950 };
951
952
953
954 static struct usb_device_id mdc800_table [] = {
955         { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
956         { }                                             /* Terminating entry */
957 };
958
959 MODULE_DEVICE_TABLE (usb, mdc800_table);
960 /*
961  * USB Driver Struct for this device
962  */
963 static struct usb_driver mdc800_usb_driver =
964 {
965         .owner =        THIS_MODULE,
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=kmalloc (sizeof (struct mdc800_data), GFP_KERNEL);
983         if (!mdc800)
984                 goto cleanup_on_fail;
985
986         memset(mdc800, 0, sizeof(struct mdc800_data));
987         mdc800->dev = NULL;
988         mdc800->open=0;
989         mdc800->state=NOT_CONNECTED;
990         init_MUTEX (&mdc800->io_lock);
991
992         init_waitqueue_head (&mdc800->irq_wait);
993         init_waitqueue_head (&mdc800->write_wait);
994         init_waitqueue_head (&mdc800->download_wait);
995
996         mdc800->irq_woken = 0;
997         mdc800->downloaded = 0;
998         mdc800->written = 0;
999
1000         mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1001         if (!mdc800->irq_urb_buffer)
1002                 goto cleanup_on_fail;
1003         mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1004         if (!mdc800->write_urb_buffer)
1005                 goto cleanup_on_fail;
1006         mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1007         if (!mdc800->download_urb_buffer)
1008                 goto cleanup_on_fail;
1009
1010         mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1011         if (!mdc800->irq_urb)
1012                 goto cleanup_on_fail;
1013         mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1014         if (!mdc800->download_urb)
1015                 goto cleanup_on_fail;
1016         mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1017         if (!mdc800->write_urb)
1018                 goto cleanup_on_fail;
1019
1020         /* Register the driver */
1021         retval = usb_register(&mdc800_usb_driver);
1022         if (retval)
1023                 goto cleanup_on_fail;
1024
1025         info (DRIVER_VERSION ":" DRIVER_DESC);
1026
1027         return 0;
1028
1029         /* Clean driver up, when something fails */
1030
1031 cleanup_on_fail:
1032
1033         if (mdc800 != NULL)
1034         {
1035                 err ("can't alloc memory!");
1036
1037                 kfree(mdc800->download_urb_buffer);
1038                 kfree(mdc800->write_urb_buffer);
1039                 kfree(mdc800->irq_urb_buffer);
1040
1041                 usb_free_urb(mdc800->write_urb);
1042                 usb_free_urb(mdc800->download_urb);
1043                 usb_free_urb(mdc800->irq_urb);
1044
1045                 kfree (mdc800);
1046         }
1047         mdc800 = NULL;
1048         return retval;
1049 }
1050
1051
1052 static void __exit usb_mdc800_cleanup (void)
1053 {
1054         usb_deregister (&mdc800_usb_driver);
1055
1056         usb_free_urb (mdc800->irq_urb);
1057         usb_free_urb (mdc800->download_urb);
1058         usb_free_urb (mdc800->write_urb);
1059
1060         kfree (mdc800->irq_urb_buffer);
1061         kfree (mdc800->write_urb_buffer);
1062         kfree (mdc800->download_urb_buffer);
1063
1064         kfree (mdc800);
1065         mdc800 = NULL;
1066 }
1067
1068 module_init (usb_mdc800_init);
1069 module_exit (usb_mdc800_cleanup);
1070
1071 MODULE_AUTHOR( DRIVER_AUTHOR );
1072 MODULE_DESCRIPTION( DRIVER_DESC );
1073 MODULE_LICENSE("GPL");
1074