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[PATCH] USB: optimise devio.c usbdev_read fix
[mirror_ubuntu-focal-kernel.git] / drivers / usb / image / mdc800.c
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1da177e4
LT		 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.
093cf723 26 * To use the Camera you must support the USB Protocol of the camera
1da177e4
LT		 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
131typedef enum {
132 NOT_CONNECTED, READY, WORKING, DOWNLOAD
133} mdc800_state;
134
135
136/* Data for the driver */
137struct 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 */
184static 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 */
229static struct mdc800_data* mdc800;
230
231
232/***************************************************************************
233 The USB Part of the driver
234****************************************************************************/
235
236static 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 */
249static 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 */
265static 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 */
282static 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 */
348static 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 */
376static 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 */
396static 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
425static struct usb_driver mdc800_usb_driver;
426static struct file_operations mdc800_device_ops;
427static struct usb_class_driver mdc800_class = {
d6e5bcf4 428 .name = "mdc800%d",
1da177e4 429 .fops = &mdc800_device_ops,
1da177e4
LT		 430 .minor_base = MDC800_DEVICE_MINOR_BASE,
431};
432
433
434/*
435 * Callback to search the Mustek MDC800 on the USB Bus
436 */
437static 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 */
555static 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 */
587static 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 */
618static 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
658error_out:
659 up (&mdc800->io_lock);
660 return errn;
661}
662
663
664/*
665 * Close the Camera and release Memory
666 */
667static 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 */
693static 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 */
784static 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 */
943static 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
954static struct usb_device_id mdc800_table [] = {
955 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
956 { } /* Terminating entry */
957};
958
959MODULE_DEVICE_TABLE (usb, mdc800_table);
960/*
961 * USB Driver Struct for this device
962 */
963static struct usb_driver mdc800_usb_driver =
964{
1da177e4
LT		 965 .name = "mdc800",
966 .probe = mdc800_usb_probe,
967 .disconnect = mdc800_usb_disconnect,
968 .id_table = mdc800_table
969};
970
971
972
973/************************************************************************
974 Init and Cleanup this driver (Main Functions)
975*************************************************************************/
976
1da177e4
LT		 977static int __init usb_mdc800_init (void)
978{
979 int retval = -ENODEV;
980 /* Allocate Memory */
72129cd6
AD		 981 mdc800=kmalloc (sizeof (struct mdc800_data), GFP_KERNEL);
982 if (!mdc800)
983 goto cleanup_on_fail;
1da177e4
LT		 984
985 memset(mdc800, 0, sizeof(struct mdc800_data));
986 mdc800->dev = NULL;
987 mdc800->open=0;
988 mdc800->state=NOT_CONNECTED;
989 init_MUTEX (&mdc800->io_lock);
990
991 init_waitqueue_head (&mdc800->irq_wait);
992 init_waitqueue_head (&mdc800->write_wait);
993 init_waitqueue_head (&mdc800->download_wait);
994
995 mdc800->irq_woken = 0;
996 mdc800->downloaded = 0;
997 mdc800->written = 0;
998
72129cd6
AD		 999 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1000 if (!mdc800->irq_urb_buffer)
1001 goto cleanup_on_fail;
1002 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1003 if (!mdc800->write_urb_buffer)
1004 goto cleanup_on_fail;
1005 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1006 if (!mdc800->download_urb_buffer)
1007 goto cleanup_on_fail;
1008
1009 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1010 if (!mdc800->irq_urb)
1011 goto cleanup_on_fail;
1012 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1013 if (!mdc800->download_urb)
1014 goto cleanup_on_fail;
1015 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1016 if (!mdc800->write_urb)
1017 goto cleanup_on_fail;
1da177e4
LT		 1018
1019 /* Register the driver */
1020 retval = usb_register(&mdc800_usb_driver);
1021 if (retval)
1022 goto cleanup_on_fail;
1023
1024 info (DRIVER_VERSION ":" DRIVER_DESC);
1025
1026 return 0;
1027
1028 /* Clean driver up, when something fails */
1029
1030cleanup_on_fail:
1031
1032 if (mdc800 != NULL)
1033 {
1034 err ("can't alloc memory!");
1035
1036 kfree(mdc800->download_urb_buffer);
1037 kfree(mdc800->write_urb_buffer);
1038 kfree(mdc800->irq_urb_buffer);
1039
1040 usb_free_urb(mdc800->write_urb);
1041 usb_free_urb(mdc800->download_urb);
1042 usb_free_urb(mdc800->irq_urb);
1043
1044 kfree (mdc800);
1045 }
1046 mdc800 = NULL;
1047 return retval;
1048}
1049
1050
1051static void __exit usb_mdc800_cleanup (void)
1052{
1053 usb_deregister (&mdc800_usb_driver);
1054
1055 usb_free_urb (mdc800->irq_urb);
1056 usb_free_urb (mdc800->download_urb);
1057 usb_free_urb (mdc800->write_urb);
1058
1059 kfree (mdc800->irq_urb_buffer);
1060 kfree (mdc800->write_urb_buffer);
1061 kfree (mdc800->download_urb_buffer);
1062
1063 kfree (mdc800);
1064 mdc800 = NULL;
1065}
1066
1067module_init (usb_mdc800_init);
1068module_exit (usb_mdc800_cleanup);
1069
1070MODULE_AUTHOR( DRIVER_AUTHOR );
1071MODULE_DESCRIPTION( DRIVER_DESC );
1072MODULE_LICENSE("GPL");
1073
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