Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / 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
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)
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)
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 const 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         mutex_lock(&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         mutex_unlock(&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                 /* must be under lock to make sure no URB
568                    is submitted after usb_kill_urb() */
569                 mutex_lock(&mdc800->io_lock);
570                 mdc800->state=NOT_CONNECTED;
571
572                 usb_kill_urb(mdc800->irq_urb);
573                 usb_kill_urb(mdc800->write_urb);
574                 usb_kill_urb(mdc800->download_urb);
575                 mutex_unlock(&mdc800->io_lock);
576
577                 mdc800->dev = NULL;
578                 usb_set_intfdata(intf, NULL);
579         }
580         info ("Mustek MDC800 disconnected from USB.");
581 }
582
583
584 /***************************************************************************
585         The Misc device Part (file_operations)
586 ****************************************************************************/
587
588 /*
589  * This Function calc the Answersize for a command.
590  */
591 static int mdc800_getAnswerSize (char command)
592 {
593         switch ((unsigned char) command)
594         {
595                 case 0x2a:
596                 case 0x49:
597                 case 0x51:
598                 case 0x0d:
599                 case 0x20:
600                 case 0x07:
601                 case 0x01:
602                 case 0x25:
603                 case 0x00:
604                         return 8;
605
606                 case 0x05:
607                 case 0x3e:
608                         return mdc800->pic_len;
609
610                 case 0x09:
611                         return 4096;
612
613                 default:
614                         return 0;
615         }
616 }
617
618
619 /*
620  * Init the device: (1) alloc mem (2) Increase MOD Count ..
621  */
622 static int mdc800_device_open (struct inode* inode, struct file *file)
623 {
624         int retval=0;
625         int errn=0;
626
627         mutex_lock(&mdc800->io_lock);
628         
629         if (mdc800->state == NOT_CONNECTED)
630         {
631                 errn=-EBUSY;
632                 goto error_out;
633         }
634         if (mdc800->open)
635         {
636                 errn=-EBUSY;
637                 goto error_out;
638         }
639
640         mdc800->in_count=0;
641         mdc800->out_count=0;
642         mdc800->out_ptr=0;
643         mdc800->pic_index=0;
644         mdc800->pic_len=-1;
645         mdc800->download_left=0;
646
647         mdc800->camera_busy=0;
648         mdc800->camera_request_ready=0;
649
650         retval=0;
651         mdc800->irq_urb->dev = mdc800->dev;
652         if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
653         {
654                 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
655                 errn = -EIO;
656                 goto error_out;
657         }
658
659         mdc800->open=1;
660         dbg ("Mustek MDC800 device opened.");
661
662 error_out:
663         mutex_unlock(&mdc800->io_lock);
664         return errn;
665 }
666
667
668 /*
669  * Close the Camera and release Memory
670  */
671 static int mdc800_device_release (struct inode* inode, struct file *file)
672 {
673         int retval=0;
674         dbg ("Mustek MDC800 device closed.");
675
676         mutex_lock(&mdc800->io_lock);
677         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
678         {
679                 usb_kill_urb(mdc800->irq_urb);
680                 usb_kill_urb(mdc800->write_urb);
681                 usb_kill_urb(mdc800->download_urb);
682                 mdc800->open=0;
683         }
684         else
685         {
686                 retval=-EIO;
687         }
688
689         mutex_unlock(&mdc800->io_lock);
690         return retval;
691 }
692
693
694 /*
695  * The Device read callback Function
696  */
697 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
698 {
699         size_t left=len, sts=len; /* single transfer size */
700         char __user *ptr = buf;
701
702         mutex_lock(&mdc800->io_lock);
703         if (mdc800->state == NOT_CONNECTED)
704         {
705                 mutex_unlock(&mdc800->io_lock);
706                 return -EBUSY;
707         }
708         if (mdc800->state == WORKING)
709         {
710                 warn ("Illegal State \"working\" reached during read ?!");
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                                 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
741                                 {
742                                         err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
743                                         mutex_unlock(&mdc800->io_lock);
744                                         return len-left;
745                                 }
746                                 wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
747                                                                                 TO_DOWNLOAD_GET_READY*HZ/1000);
748                                 mdc800->downloaded = 0;
749                                 if (mdc800->download_urb->status != 0)
750                                 {
751                                         err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
752                                         mutex_unlock(&mdc800->io_lock);
753                                         return len-left;
754                                 }
755                         }
756                         else
757                         {
758                                 /* No more bytes -> that's an error*/
759                                 mutex_unlock(&mdc800->io_lock);
760                                 return -EIO;
761                         }
762                 }
763                 else
764                 {
765                         /* Copy Bytes */
766                         if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
767                                                 sts)) {
768                                 mutex_unlock(&mdc800->io_lock);
769                                 return -EFAULT;
770                         }
771                         ptr+=sts;
772                         left-=sts;
773                         mdc800->out_ptr+=sts;
774                 }
775         }
776
777         mutex_unlock(&mdc800->io_lock);
778         return len-left;
779 }
780
781
782 /*
783  * The Device write callback Function
784  * If a 8Byte Command is received, it will be send to the camera.
785  * After this the driver initiates the request for the answer or
786  * just waits until the camera becomes ready.
787  */
788 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
789 {
790         size_t i=0;
791
792         mutex_lock(&mdc800->io_lock);
793         if (mdc800->state != READY)
794         {
795                 mutex_unlock(&mdc800->io_lock);
796                 return -EBUSY;
797         }
798         if (!mdc800->open )
799         {
800                 mutex_unlock(&mdc800->io_lock);
801                 return -EBUSY;
802         }
803
804         while (i<len)
805         {
806                 unsigned char c;
807                 if (signal_pending (current)) 
808                 {
809                         mutex_unlock(&mdc800->io_lock);
810                         return -EINTR;
811                 }
812                 
813                 if(get_user(c, buf+i))
814                 {
815                         mutex_unlock(&mdc800->io_lock);
816                         return -EFAULT;
817                 }
818
819                 /* check for command start */
820                 if (c == 0x55)
821                 {
822                         mdc800->in_count=0;
823                         mdc800->out_count=0;
824                         mdc800->out_ptr=0;
825                         mdc800->download_left=0;
826                 }
827
828                 /* save command byte */
829                 if (mdc800->in_count < 8)
830                 {
831                         mdc800->in[mdc800->in_count] = c;
832                         mdc800->in_count++;
833                 }
834                 else
835                 {
836                         mutex_unlock(&mdc800->io_lock);
837                         return -EIO;
838                 }
839
840                 /* Command Buffer full ? -> send it to camera */
841                 if (mdc800->in_count == 8)
842                 {
843                         int answersize;
844
845                         if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
846                         {
847                                 err ("Camera didn't get ready.\n");
848                                 mutex_unlock(&mdc800->io_lock);
849                                 return -EIO;
850                         }
851
852                         answersize=mdc800_getAnswerSize (mdc800->in[1]);
853
854                         mdc800->state=WORKING;
855                         memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
856                         mdc800->write_urb->dev = mdc800->dev;
857                         if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
858                         {
859                                 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
860                                 mutex_unlock(&mdc800->io_lock);
861                                 return -EIO;
862                         }
863                         wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
864                         mdc800->written = 0;
865                         if (mdc800->state == WORKING)
866                         {
867                                 usb_kill_urb(mdc800->write_urb);
868                                 mutex_unlock(&mdc800->io_lock);
869                                 return -EIO;
870                         }
871
872                         switch ((unsigned char) mdc800->in[1])
873                         {
874                                 case 0x05: /* Download Image */
875                                 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
876                                         if (mdc800->pic_len < 0)
877                                         {
878                                                 err ("call 0x07 before 0x05,0x3e");
879                                                 mdc800->state=READY;
880                                                 mutex_unlock(&mdc800->io_lock);
881                                                 return -EIO;
882                                         }
883                                         mdc800->pic_len=-1;
884
885                                 case 0x09: /* Download Thumbnail */
886                                         mdc800->download_left=answersize+64;
887                                         mdc800->state=DOWNLOAD;
888                                         mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
889                                         break;
890
891
892                                 default:
893                                         if (answersize)
894                                         {
895
896                                                 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
897                                                 {
898                                                         err ("requesting answer from irq fails");
899                                                         mutex_unlock(&mdc800->io_lock);
900                                                         return -EIO;
901                                                 }
902
903                                                 /* Write dummy data, (this is ugly but part of the USB Protocol */
904                                                 /* if you use endpoint 1 as bulk and not as irq) */
905                                                 memcpy (mdc800->out, mdc800->camera_response,8);
906
907                                                 /* This is the interpreted answer */
908                                                 memcpy (&mdc800->out[8], mdc800->camera_response,8);
909
910                                                 mdc800->out_ptr=0;
911                                                 mdc800->out_count=16;
912
913                                                 /* Cache the Imagesize, if command was getImageSize */
914                                                 if (mdc800->in [1] == (char) 0x07)
915                                                 {
916                                                         mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
917
918                                                         dbg ("cached imagesize = %i",mdc800->pic_len);
919                                                 }
920
921                                         }
922                                         else
923                                         {
924                                                 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
925                                                 {
926                                                         err ("Command Timeout.");
927                                                         mutex_unlock(&mdc800->io_lock);
928                                                         return -EIO;
929                                                 }
930                                         }
931                                         mdc800->state=READY;
932                                         break;
933                         }
934                 }
935                 i++;
936         }
937         mutex_unlock(&mdc800->io_lock);
938         return i;
939 }
940
941
942 /***************************************************************************
943         Init and Cleanup this driver (Structs and types)
944 ****************************************************************************/
945
946 /* File Operations of this drivers */
947 static const struct file_operations mdc800_device_ops =
948 {
949         .owner =        THIS_MODULE,
950         .read =         mdc800_device_read,
951         .write =        mdc800_device_write,
952         .open =         mdc800_device_open,
953         .release =      mdc800_device_release,
954 };
955
956
957
958 static struct usb_device_id mdc800_table [] = {
959         { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
960         { }                                             /* Terminating entry */
961 };
962
963 MODULE_DEVICE_TABLE (usb, mdc800_table);
964 /*
965  * USB Driver Struct for this device
966  */
967 static struct usb_driver mdc800_usb_driver =
968 {
969         .name =         "mdc800",
970         .probe =        mdc800_usb_probe,
971         .disconnect =   mdc800_usb_disconnect,
972         .id_table =     mdc800_table
973 };
974
975
976
977 /************************************************************************
978         Init and Cleanup this driver (Main Functions)
979 *************************************************************************/
980
981 static int __init usb_mdc800_init (void)
982 {
983         int retval = -ENODEV;
984         /* Allocate Memory */
985         mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
986         if (!mdc800)
987                 goto cleanup_on_fail;
988
989         mdc800->dev = NULL;
990         mdc800->state=NOT_CONNECTED;
991         mutex_init (&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         mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1002         if (!mdc800->irq_urb_buffer)
1003                 goto cleanup_on_fail;
1004         mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1005         if (!mdc800->write_urb_buffer)
1006                 goto cleanup_on_fail;
1007         mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1008         if (!mdc800->download_urb_buffer)
1009                 goto cleanup_on_fail;
1010
1011         mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1012         if (!mdc800->irq_urb)
1013                 goto cleanup_on_fail;
1014         mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1015         if (!mdc800->download_urb)
1016                 goto cleanup_on_fail;
1017         mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1018         if (!mdc800->write_urb)
1019                 goto cleanup_on_fail;
1020
1021         /* Register the driver */
1022         retval = usb_register(&mdc800_usb_driver);
1023         if (retval)
1024                 goto cleanup_on_fail;
1025
1026         info (DRIVER_VERSION ":" DRIVER_DESC);
1027
1028         return 0;
1029
1030         /* Clean driver up, when something fails */
1031
1032 cleanup_on_fail:
1033
1034         if (mdc800 != NULL)
1035         {
1036                 err ("can't alloc memory!");
1037
1038                 kfree(mdc800->download_urb_buffer);
1039                 kfree(mdc800->write_urb_buffer);
1040                 kfree(mdc800->irq_urb_buffer);
1041
1042                 usb_free_urb(mdc800->write_urb);
1043                 usb_free_urb(mdc800->download_urb);
1044                 usb_free_urb(mdc800->irq_urb);
1045
1046                 kfree (mdc800);
1047         }
1048         mdc800 = NULL;
1049         return retval;
1050 }
1051
1052
1053 static void __exit usb_mdc800_cleanup (void)
1054 {
1055         usb_deregister (&mdc800_usb_driver);
1056
1057         usb_free_urb (mdc800->irq_urb);
1058         usb_free_urb (mdc800->download_urb);
1059         usb_free_urb (mdc800->write_urb);
1060
1061         kfree (mdc800->irq_urb_buffer);
1062         kfree (mdc800->write_urb_buffer);
1063         kfree (mdc800->download_urb_buffer);
1064
1065         kfree (mdc800);
1066         mdc800 = NULL;
1067 }
1068
1069 module_init (usb_mdc800_init);
1070 module_exit (usb_mdc800_cleanup);
1071
1072 MODULE_AUTHOR( DRIVER_AUTHOR );
1073 MODULE_DESCRIPTION( DRIVER_DESC );
1074 MODULE_LICENSE("GPL");
1075