USB: Make file operations structs in drivers/usb const.
[linux-3.10.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 #include <linux/mutex.h>
100
101 #include <linux/usb.h>
102 #include <linux/fs.h>
103
104 /*
105  * Version Information
106  */
107 #define DRIVER_VERSION "v0.7.5 (30/10/2000)"
108 #define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>"
109 #define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera"
110
111 /* Vendor and Product Information */
112 #define MDC800_VENDOR_ID        0x055f
113 #define MDC800_PRODUCT_ID       0xa800
114
115 /* Timeouts (msec) */
116 #define TO_DOWNLOAD_GET_READY           1500
117 #define TO_DOWNLOAD_GET_BUSY            1500
118 #define TO_WRITE_GET_READY              1000
119 #define TO_DEFAULT_COMMAND              5000
120 #define TO_READ_FROM_IRQ                TO_DEFAULT_COMMAND
121 #define TO_GET_READY                    TO_DEFAULT_COMMAND
122
123 /* Minor Number of the device (create with mknod /dev/mustek c 180 32) */
124 #define MDC800_DEVICE_MINOR_BASE 32
125
126
127 /**************************************************************************
128         Data and structs
129 ***************************************************************************/
130
131
132 typedef enum {
133         NOT_CONNECTED, READY, WORKING, DOWNLOAD
134 } mdc800_state;
135
136
137 /* Data for the driver */
138 struct mdc800_data
139 {
140         struct usb_device *     dev;                    // Device Data
141         mdc800_state            state;
142
143         unsigned int            endpoint [4];
144
145         struct urb *            irq_urb;
146         wait_queue_head_t       irq_wait;
147         int                     irq_woken;
148         char*                   irq_urb_buffer;
149
150         int                     camera_busy;          // is camera busy ?
151         int                     camera_request_ready; // Status to synchronize with irq
152         char                    camera_response [8];  // last Bytes send after busy
153
154         struct urb *            write_urb;
155         char*                   write_urb_buffer;
156         wait_queue_head_t       write_wait;
157         int                     written;
158
159
160         struct urb *            download_urb;
161         char*                   download_urb_buffer;
162         wait_queue_head_t       download_wait;
163         int                     downloaded;
164         int                     download_left;          // Bytes left to download ?
165
166
167         /* Device Data */
168         char                    out [64];       // Answer Buffer
169         int                     out_ptr;        // Index to the first not readen byte
170         int                     out_count;      // Bytes in the buffer
171
172         int                     open;           // Camera device open ?
173         struct mutex            io_lock;        // IO -lock
174
175         char                    in [8];         // Command Input Buffer
176         int                     in_count;
177
178         int                     pic_index;      // Cache for the Imagesize (-1 for nothing cached )
179         int                     pic_len;
180         int                     minor;
181 };
182
183
184 /* Specification of the Endpoints */
185 static struct usb_endpoint_descriptor mdc800_ed [4] =
186 {
187         { 
188                 .bLength =              0,
189                 .bDescriptorType =      0,
190                 .bEndpointAddress =     0x01,
191                 .bmAttributes =         0x02,
192                 .wMaxPacketSize =       __constant_cpu_to_le16(8),
193                 .bInterval =            0,
194                 .bRefresh =             0,
195                 .bSynchAddress =        0,
196         },
197         {
198                 .bLength =              0,
199                 .bDescriptorType =      0,
200                 .bEndpointAddress =     0x82,
201                 .bmAttributes =         0x03,
202                 .wMaxPacketSize =       __constant_cpu_to_le16(8),
203                 .bInterval =            0,
204                 .bRefresh =             0,
205                 .bSynchAddress =        0,
206         },
207         {
208                 .bLength =              0,
209                 .bDescriptorType =      0,
210                 .bEndpointAddress =     0x03,
211                 .bmAttributes =         0x02,
212                 .wMaxPacketSize =       __constant_cpu_to_le16(64),
213                 .bInterval =            0,
214                 .bRefresh =             0,
215                 .bSynchAddress =        0,
216         },
217         {
218                 .bLength =              0,
219                 .bDescriptorType =      0,
220                 .bEndpointAddress =     0x84,
221                 .bmAttributes =         0x02,
222                 .wMaxPacketSize =       __constant_cpu_to_le16(64),
223                 .bInterval =            0,
224                 .bRefresh =             0,
225                 .bSynchAddress =        0,
226         },
227 };
228
229 /* The Variable used by the driver */
230 static struct mdc800_data* mdc800;
231
232
233 /***************************************************************************
234         The USB Part of the driver
235 ****************************************************************************/
236
237 static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b)
238 {
239         return (
240                    ( a->bEndpointAddress == b->bEndpointAddress )
241                 && ( a->bmAttributes     == b->bmAttributes     )
242                 && ( a->wMaxPacketSize   == b->wMaxPacketSize   )
243         );
244 }
245
246
247 /*
248  * Checks whether the camera responds busy
249  */
250 static int mdc800_isBusy (char* ch)
251 {
252         int i=0;
253         while (i<8)
254         {
255                 if (ch [i] != (char)0x99)
256                         return 0;
257                 i++;
258         }
259         return 1;
260 }
261
262
263 /*
264  * Checks whether the Camera is ready
265  */
266 static int mdc800_isReady (char *ch)
267 {
268         int i=0;
269         while (i<8)
270         {
271                 if (ch [i] != (char)0xbb)
272                         return 0;
273                 i++;
274         }
275         return 1;
276 }
277
278
279
280 /*
281  * USB IRQ Handler for InputLine
282  */
283 static void mdc800_usb_irq (struct urb *urb, struct pt_regs *res)
284 {
285         int data_received=0, wake_up;
286         unsigned char* b=urb->transfer_buffer;
287         struct mdc800_data* mdc800=urb->context;
288
289         if (urb->status >= 0)
290         {
291
292                 //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]);
293
294                 if (mdc800_isBusy (b))
295                 {
296                         if (!mdc800->camera_busy)
297                         {
298                                 mdc800->camera_busy=1;
299                                 dbg ("gets busy");
300                         }
301                 }
302                 else
303                 {
304                         if (mdc800->camera_busy && mdc800_isReady (b))
305                         {
306                                 mdc800->camera_busy=0;
307                                 dbg ("gets ready");
308                         }
309                 }
310                 if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
311                 {
312                         /* Store Data in camera_answer field */
313                         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]);
314
315                         memcpy (mdc800->camera_response,b,8);
316                         data_received=1;
317                 }
318         }
319         wake_up= ( mdc800->camera_request_ready > 0 )
320                 &&
321                 (
322                         ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
323                 ||
324                         ((mdc800->camera_request_ready == 2) && data_received)
325                 ||
326                         ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
327                 ||
328                         (urb->status < 0)
329                 );
330
331         if (wake_up)
332         {
333                 mdc800->camera_request_ready=0;
334                 mdc800->irq_woken=1;
335                 wake_up (&mdc800->irq_wait);
336         }
337 }
338
339
340 /*
341  * Waits a while until the irq responds that camera is ready
342  *
343  *  mode : 0: Wait for camera gets ready
344  *         1: Wait for receiving data
345  *         2: Wait for camera gets busy
346  *
347  * msec: Time to wait
348  */
349 static int mdc800_usb_waitForIRQ (int mode, int msec)
350 {
351         mdc800->camera_request_ready=1+mode;
352
353         wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000);
354         mdc800->irq_woken = 0;
355
356         if (mdc800->camera_request_ready>0)
357         {
358                 mdc800->camera_request_ready=0;
359                 err ("timeout waiting for camera.");
360                 return -1;
361         }
362         
363         if (mdc800->state == NOT_CONNECTED)
364         {
365                 warn ("Camera gets disconnected during waiting for irq.");
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, struct pt_regs *res)
378 {
379         struct mdc800_data* mdc800=urb->context;
380
381         if (urb->status != 0)
382         {
383                 err ("writing command fails (status=%i)", urb->status);
384         }
385         else
386         {       
387                 mdc800->state=READY;
388         }
389         mdc800->written = 1;
390         wake_up (&mdc800->write_wait);
391 }
392
393
394 /*
395  * The download_urb callback function
396  */
397 static void mdc800_usb_download_notify (struct urb *urb, struct pt_regs *res)
398 {
399         struct mdc800_data* mdc800=urb->context;
400
401         if (urb->status == 0)
402         {
403                 /* Fill output buffer with these data */
404                 memcpy (mdc800->out,  urb->transfer_buffer, 64);
405                 mdc800->out_count=64;
406                 mdc800->out_ptr=0;
407                 mdc800->download_left-=64;
408                 if (mdc800->download_left == 0)
409                 {
410                         mdc800->state=READY;
411                 }
412         }
413         else
414         {
415                 err ("request bytes fails (status:%i)", urb->status);
416         }
417         mdc800->downloaded = 1;
418         wake_up (&mdc800->download_wait);
419 }
420
421
422 /***************************************************************************
423         Probing for the Camera
424  ***************************************************************************/
425
426 static struct usb_driver mdc800_usb_driver;
427 static const struct file_operations mdc800_device_ops;
428 static struct usb_class_driver mdc800_class = {
429         .name =         "mdc800%d",
430         .fops =         &mdc800_device_ops,
431         .minor_base =   MDC800_DEVICE_MINOR_BASE,
432 };
433
434
435 /*
436  * Callback to search the Mustek MDC800 on the USB Bus
437  */
438 static int mdc800_usb_probe (struct usb_interface *intf,
439                                const struct usb_device_id *id)
440 {
441         int i,j;
442         struct usb_host_interface *intf_desc;
443         struct usb_device *dev = interface_to_usbdev (intf);
444         int irq_interval=0;
445         int retval;
446
447         dbg ("(mdc800_usb_probe) called.");
448
449
450         if (mdc800->dev != NULL)
451         {
452                 warn ("only one Mustek MDC800 is supported.");
453                 return -ENODEV;
454         }
455
456         if (dev->descriptor.bNumConfigurations != 1)
457         {
458                 err ("probe fails -> wrong Number of Configuration");
459                 return -ENODEV;
460         }
461         intf_desc = intf->cur_altsetting;
462
463         if (
464                         ( intf_desc->desc.bInterfaceClass != 0xff )
465                 ||      ( intf_desc->desc.bInterfaceSubClass != 0 )
466                 || ( intf_desc->desc.bInterfaceProtocol != 0 )
467                 || ( intf_desc->desc.bNumEndpoints != 4)
468         )
469         {
470                 err ("probe fails -> wrong Interface");
471                 return -ENODEV;
472         }
473
474         /* Check the Endpoints */
475         for (i=0; i<4; i++)
476         {
477                 mdc800->endpoint[i]=-1;
478                 for (j=0; j<4; j++)
479                 {
480                         if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
481                         {
482                                 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
483                                 if (i==1)
484                                 {
485                                         irq_interval=intf_desc->endpoint [j].desc.bInterval;
486                                 }
487
488                                 continue;
489                         }
490                 }
491                 if (mdc800->endpoint[i] == -1)
492                 {
493                         err ("probe fails -> Wrong Endpoints.");
494                         return -ENODEV;
495                 }
496         }
497
498
499         info ("Found Mustek MDC800 on USB.");
500
501         mutex_lock(&mdc800->io_lock);
502
503         retval = usb_register_dev(intf, &mdc800_class);
504         if (retval) {
505                 err ("Not able to get a minor for this device.");
506                 return -ENODEV;
507         }
508
509         mdc800->dev=dev;
510         mdc800->open=0;
511
512         /* Setup URB Structs */
513         usb_fill_int_urb (
514                 mdc800->irq_urb,
515                 mdc800->dev,
516                 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
517                 mdc800->irq_urb_buffer,
518                 8,
519                 mdc800_usb_irq,
520                 mdc800,
521                 irq_interval
522         );
523
524         usb_fill_bulk_urb (
525                 mdc800->write_urb,
526                 mdc800->dev,
527                 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
528                 mdc800->write_urb_buffer,
529                 8,
530                 mdc800_usb_write_notify,
531                 mdc800
532         );
533
534         usb_fill_bulk_urb (
535                 mdc800->download_urb,
536                 mdc800->dev,
537                 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
538                 mdc800->download_urb_buffer,
539                 64,
540                 mdc800_usb_download_notify,
541                 mdc800
542         );
543
544         mdc800->state=READY;
545
546         mutex_unlock(&mdc800->io_lock);
547         
548         usb_set_intfdata(intf, mdc800);
549         return 0;
550 }
551
552
553 /*
554  * Disconnect USB device (maybe the MDC800)
555  */
556 static void mdc800_usb_disconnect (struct usb_interface *intf)
557 {
558         struct mdc800_data* mdc800 = usb_get_intfdata(intf);
559
560         dbg ("(mdc800_usb_disconnect) called");
561
562         if (mdc800) {
563                 if (mdc800->state == NOT_CONNECTED)
564                         return;
565
566                 usb_deregister_dev(intf, &mdc800_class);
567
568                 mdc800->state=NOT_CONNECTED;
569
570                 usb_kill_urb(mdc800->irq_urb);
571                 usb_kill_urb(mdc800->write_urb);
572                 usb_kill_urb(mdc800->download_urb);
573
574                 mdc800->dev = NULL;
575                 usb_set_intfdata(intf, NULL);
576         }
577         info ("Mustek MDC800 disconnected from USB.");
578 }
579
580
581 /***************************************************************************
582         The Misc device Part (file_operations)
583 ****************************************************************************/
584
585 /*
586  * This Function calc the Answersize for a command.
587  */
588 static int mdc800_getAnswerSize (char command)
589 {
590         switch ((unsigned char) command)
591         {
592                 case 0x2a:
593                 case 0x49:
594                 case 0x51:
595                 case 0x0d:
596                 case 0x20:
597                 case 0x07:
598                 case 0x01:
599                 case 0x25:
600                 case 0x00:
601                         return 8;
602
603                 case 0x05:
604                 case 0x3e:
605                         return mdc800->pic_len;
606
607                 case 0x09:
608                         return 4096;
609
610                 default:
611                         return 0;
612         }
613 }
614
615
616 /*
617  * Init the device: (1) alloc mem (2) Increase MOD Count ..
618  */
619 static int mdc800_device_open (struct inode* inode, struct file *file)
620 {
621         int retval=0;
622         int errn=0;
623
624         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         if (usb_submit_urb (mdc800->irq_urb, GFP_KERNEL))
650         {
651                 err ("request USB irq fails (submit_retval=%i urb_status=%i).",retval, mdc800->irq_urb->status);
652                 errn = -EIO;
653                 goto error_out;
654         }
655
656         mdc800->open=1;
657         dbg ("Mustek MDC800 device opened.");
658
659 error_out:
660         mutex_unlock(&mdc800->io_lock);
661         return errn;
662 }
663
664
665 /*
666  * Close the Camera and release Memory
667  */
668 static int mdc800_device_release (struct inode* inode, struct file *file)
669 {
670         int retval=0;
671         dbg ("Mustek MDC800 device closed.");
672
673         mutex_lock(&mdc800->io_lock);
674         if (mdc800->open && (mdc800->state != NOT_CONNECTED))
675         {
676                 usb_kill_urb(mdc800->irq_urb);
677                 usb_kill_urb(mdc800->write_urb);
678                 usb_kill_urb(mdc800->download_urb);
679                 mdc800->open=0;
680         }
681         else
682         {
683                 retval=-EIO;
684         }
685
686         mutex_unlock(&mdc800->io_lock);
687         return retval;
688 }
689
690
691 /*
692  * The Device read callback Function
693  */
694 static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
695 {
696         size_t left=len, sts=len; /* single transfer size */
697         char __user *ptr = buf;
698
699         mutex_lock(&mdc800->io_lock);
700         if (mdc800->state == NOT_CONNECTED)
701         {
702                 mutex_unlock(&mdc800->io_lock);
703                 return -EBUSY;
704         }
705         if (mdc800->state == WORKING)
706         {
707                 warn ("Illegal State \"working\" reached during read ?!");
708                 mutex_unlock(&mdc800->io_lock);
709                 return -EBUSY;
710         }
711         if (!mdc800->open)
712         {
713                 mutex_unlock(&mdc800->io_lock);
714                 return -EBUSY;
715         }
716
717         while (left)
718         {
719                 if (signal_pending (current)) 
720                 {
721                         mutex_unlock(&mdc800->io_lock);
722                         return -EINTR;
723                 }
724
725                 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
726
727                 if (sts <= 0)
728                 {
729                         /* Too less Data in buffer */
730                         if (mdc800->state == DOWNLOAD)
731                         {
732                                 mdc800->out_count=0;
733                                 mdc800->out_ptr=0;
734
735                                 /* Download -> Request new bytes */
736                                 mdc800->download_urb->dev = mdc800->dev;
737                                 if (usb_submit_urb (mdc800->download_urb, GFP_KERNEL))
738                                 {
739                                         err ("Can't submit download urb (status=%i)",mdc800->download_urb->status);
740                                         mutex_unlock(&mdc800->io_lock);
741                                         return len-left;
742                                 }
743                                 wait_event_timeout(mdc800->download_wait, mdc800->downloaded,
744                                                                                 TO_DOWNLOAD_GET_READY*HZ/1000);
745                                 mdc800->downloaded = 0;
746                                 if (mdc800->download_urb->status != 0)
747                                 {
748                                         err ("request download-bytes fails (status=%i)",mdc800->download_urb->status);
749                                         mutex_unlock(&mdc800->io_lock);
750                                         return len-left;
751                                 }
752                         }
753                         else
754                         {
755                                 /* No more bytes -> that's an error*/
756                                 mutex_unlock(&mdc800->io_lock);
757                                 return -EIO;
758                         }
759                 }
760                 else
761                 {
762                         /* Copy Bytes */
763                         if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
764                                                 sts)) {
765                                 mutex_unlock(&mdc800->io_lock);
766                                 return -EFAULT;
767                         }
768                         ptr+=sts;
769                         left-=sts;
770                         mdc800->out_ptr+=sts;
771                 }
772         }
773
774         mutex_unlock(&mdc800->io_lock);
775         return len-left;
776 }
777
778
779 /*
780  * The Device write callback Function
781  * If a 8Byte Command is received, it will be send to the camera.
782  * After this the driver initiates the request for the answer or
783  * just waits until the camera becomes ready.
784  */
785 static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
786 {
787         size_t i=0;
788
789         mutex_lock(&mdc800->io_lock);
790         if (mdc800->state != READY)
791         {
792                 mutex_unlock(&mdc800->io_lock);
793                 return -EBUSY;
794         }
795         if (!mdc800->open )
796         {
797                 mutex_unlock(&mdc800->io_lock);
798                 return -EBUSY;
799         }
800
801         while (i<len)
802         {
803                 unsigned char c;
804                 if (signal_pending (current)) 
805                 {
806                         mutex_unlock(&mdc800->io_lock);
807                         return -EINTR;
808                 }
809                 
810                 if(get_user(c, buf+i))
811                 {
812                         mutex_unlock(&mdc800->io_lock);
813                         return -EFAULT;
814                 }
815
816                 /* check for command start */
817                 if (c == 0x55)
818                 {
819                         mdc800->in_count=0;
820                         mdc800->out_count=0;
821                         mdc800->out_ptr=0;
822                         mdc800->download_left=0;
823                 }
824
825                 /* save command byte */
826                 if (mdc800->in_count < 8)
827                 {
828                         mdc800->in[mdc800->in_count] = c;
829                         mdc800->in_count++;
830                 }
831                 else
832                 {
833                         mutex_unlock(&mdc800->io_lock);
834                         return -EIO;
835                 }
836
837                 /* Command Buffer full ? -> send it to camera */
838                 if (mdc800->in_count == 8)
839                 {
840                         int answersize;
841
842                         if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
843                         {
844                                 err ("Camera didn't get ready.\n");
845                                 mutex_unlock(&mdc800->io_lock);
846                                 return -EIO;
847                         }
848
849                         answersize=mdc800_getAnswerSize (mdc800->in[1]);
850
851                         mdc800->state=WORKING;
852                         memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
853                         mdc800->write_urb->dev = mdc800->dev;
854                         if (usb_submit_urb (mdc800->write_urb, GFP_KERNEL))
855                         {
856                                 err ("submitting write urb fails (status=%i)", mdc800->write_urb->status);
857                                 mutex_unlock(&mdc800->io_lock);
858                                 return -EIO;
859                         }
860                         wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
861                         mdc800->written = 0;
862                         if (mdc800->state == WORKING)
863                         {
864                                 usb_kill_urb(mdc800->write_urb);
865                                 mutex_unlock(&mdc800->io_lock);
866                                 return -EIO;
867                         }
868
869                         switch ((unsigned char) mdc800->in[1])
870                         {
871                                 case 0x05: /* Download Image */
872                                 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
873                                         if (mdc800->pic_len < 0)
874                                         {
875                                                 err ("call 0x07 before 0x05,0x3e");
876                                                 mdc800->state=READY;
877                                                 mutex_unlock(&mdc800->io_lock);
878                                                 return -EIO;
879                                         }
880                                         mdc800->pic_len=-1;
881
882                                 case 0x09: /* Download Thumbnail */
883                                         mdc800->download_left=answersize+64;
884                                         mdc800->state=DOWNLOAD;
885                                         mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
886                                         break;
887
888
889                                 default:
890                                         if (answersize)
891                                         {
892
893                                                 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
894                                                 {
895                                                         err ("requesting answer from irq fails");
896                                                         mutex_unlock(&mdc800->io_lock);
897                                                         return -EIO;
898                                                 }
899
900                                                 /* Write dummy data, (this is ugly but part of the USB Protocol */
901                                                 /* if you use endpoint 1 as bulk and not as irq) */
902                                                 memcpy (mdc800->out, mdc800->camera_response,8);
903
904                                                 /* This is the interpreted answer */
905                                                 memcpy (&mdc800->out[8], mdc800->camera_response,8);
906
907                                                 mdc800->out_ptr=0;
908                                                 mdc800->out_count=16;
909
910                                                 /* Cache the Imagesize, if command was getImageSize */
911                                                 if (mdc800->in [1] == (char) 0x07)
912                                                 {
913                                                         mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
914
915                                                         dbg ("cached imagesize = %i",mdc800->pic_len);
916                                                 }
917
918                                         }
919                                         else
920                                         {
921                                                 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
922                                                 {
923                                                         err ("Command Timeout.");
924                                                         mutex_unlock(&mdc800->io_lock);
925                                                         return -EIO;
926                                                 }
927                                         }
928                                         mdc800->state=READY;
929                                         break;
930                         }
931                 }
932                 i++;
933         }
934         mutex_unlock(&mdc800->io_lock);
935         return i;
936 }
937
938
939 /***************************************************************************
940         Init and Cleanup this driver (Structs and types)
941 ****************************************************************************/
942
943 /* File Operations of this drivers */
944 static const struct file_operations mdc800_device_ops =
945 {
946         .owner =        THIS_MODULE,
947         .read =         mdc800_device_read,
948         .write =        mdc800_device_write,
949         .open =         mdc800_device_open,
950         .release =      mdc800_device_release,
951 };
952
953
954
955 static struct usb_device_id mdc800_table [] = {
956         { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
957         { }                                             /* Terminating entry */
958 };
959
960 MODULE_DEVICE_TABLE (usb, mdc800_table);
961 /*
962  * USB Driver Struct for this device
963  */
964 static struct usb_driver mdc800_usb_driver =
965 {
966         .name =         "mdc800",
967         .probe =        mdc800_usb_probe,
968         .disconnect =   mdc800_usb_disconnect,
969         .id_table =     mdc800_table
970 };
971
972
973
974 /************************************************************************
975         Init and Cleanup this driver (Main Functions)
976 *************************************************************************/
977
978 static int __init usb_mdc800_init (void)
979 {
980         int retval = -ENODEV;
981         /* Allocate Memory */
982         mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
983         if (!mdc800)
984                 goto cleanup_on_fail;
985
986         mdc800->dev = NULL;
987         mdc800->state=NOT_CONNECTED;
988         mutex_init (&mdc800->io_lock);
989
990         init_waitqueue_head (&mdc800->irq_wait);
991         init_waitqueue_head (&mdc800->write_wait);
992         init_waitqueue_head (&mdc800->download_wait);
993
994         mdc800->irq_woken = 0;
995         mdc800->downloaded = 0;
996         mdc800->written = 0;
997
998         mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
999         if (!mdc800->irq_urb_buffer)
1000                 goto cleanup_on_fail;
1001         mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1002         if (!mdc800->write_urb_buffer)
1003                 goto cleanup_on_fail;
1004         mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1005         if (!mdc800->download_urb_buffer)
1006                 goto cleanup_on_fail;
1007
1008         mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1009         if (!mdc800->irq_urb)
1010                 goto cleanup_on_fail;
1011         mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1012         if (!mdc800->download_urb)
1013                 goto cleanup_on_fail;
1014         mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1015         if (!mdc800->write_urb)
1016                 goto cleanup_on_fail;
1017
1018         /* Register the driver */
1019         retval = usb_register(&mdc800_usb_driver);
1020         if (retval)
1021                 goto cleanup_on_fail;
1022
1023         info (DRIVER_VERSION ":" DRIVER_DESC);
1024
1025         return 0;
1026
1027         /* Clean driver up, when something fails */
1028
1029 cleanup_on_fail:
1030
1031         if (mdc800 != NULL)
1032         {
1033                 err ("can't alloc memory!");
1034
1035                 kfree(mdc800->download_urb_buffer);
1036                 kfree(mdc800->write_urb_buffer);
1037                 kfree(mdc800->irq_urb_buffer);
1038
1039                 usb_free_urb(mdc800->write_urb);
1040                 usb_free_urb(mdc800->download_urb);
1041                 usb_free_urb(mdc800->irq_urb);
1042
1043                 kfree (mdc800);
1044         }
1045         mdc800 = NULL;
1046         return retval;
1047 }
1048
1049
1050 static void __exit usb_mdc800_cleanup (void)
1051 {
1052         usb_deregister (&mdc800_usb_driver);
1053
1054         usb_free_urb (mdc800->irq_urb);
1055         usb_free_urb (mdc800->download_urb);
1056         usb_free_urb (mdc800->write_urb);
1057
1058         kfree (mdc800->irq_urb_buffer);
1059         kfree (mdc800->write_urb_buffer);
1060         kfree (mdc800->download_urb_buffer);
1061
1062         kfree (mdc800);
1063         mdc800 = NULL;
1064 }
1065
1066 module_init (usb_mdc800_init);
1067 module_exit (usb_mdc800_cleanup);
1068
1069 MODULE_AUTHOR( DRIVER_AUTHOR );
1070 MODULE_DESCRIPTION( DRIVER_DESC );
1071 MODULE_LICENSE("GPL");
1072