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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * copyright (C) 1999/2000 by Henning Zabel <henning@uni-paderborn.de>
4 */
5
6
7/*
8 * USB-Kernel Driver for the Mustek MDC800 Digital Camera
9 * (c) 1999/2000 Henning Zabel <henning@uni-paderborn.de>
10 *
11 *
12 * The driver brings the USB functions of the MDC800 to Linux.
13 * To use the Camera you must support the USB Protocol of the camera
14 * to the Kernel Node.
15 * The Driver uses a misc device Node. Create it with :
16 * mknod /dev/mustek c 180 32
17 *
18 * The driver supports only one camera.
19 *
20 * Fix: mdc800 used sleep_on and slept with io_lock held.
21 * Converted sleep_on to waitqueues with schedule_timeout and made io_lock
22 * a semaphore from a spinlock.
23 * by Oliver Neukum <oliver@neukum.name>
24 * (02/12/2001)
25 *
26 * Identify version on module load.
27 * (08/04/2001) gb
28 *
29 * version 0.7.5
30 * Fixed potential SMP races with Spinlocks.
31 * Thanks to Oliver Neukum <oliver@neukum.name> who
32 * noticed the race conditions.
33 * (30/10/2000)
34 *
35 * Fixed: Setting urb->dev before submitting urb.
36 * by Greg KH <greg@kroah.com>
37 * (13/10/2000)
38 *
39 * version 0.7.3
40 * bugfix : The mdc800->state field gets set to READY after the
41 * disconnect function sets it to NOT_CONNECTED. This makes the
42 * driver running like the camera is connected and causes some
43 * hang ups.
44 *
45 * version 0.7.1
46 * MOD_INC and MOD_DEC are changed in usb_probe to prevent load/unload
47 * problems when compiled as Module.
48 * (04/04/2000)
49 *
50 * The mdc800 driver gets assigned the USB Minor 32-47. The Registration
51 * was updated to use these values.
52 * (26/03/2000)
53 *
54 * The Init und Exit Module Function are updated.
55 * (01/03/2000)
56 *
57 * version 0.7.0
58 * Rewrite of the driver : The driver now uses URB's. The old stuff
59 * has been removed.
60 *
61 * version 0.6.0
62 * Rewrite of this driver: The Emulation of the rs232 protocoll
63 * has been removed from the driver. A special executeCommand function
64 * for this driver is included to gphoto.
65 * The driver supports two kind of communication to bulk endpoints.
66 * Either with the dev->bus->ops->bulk... or with callback function.
67 * (09/11/1999)
68 *
69 * version 0.5.0:
70 * first Version that gets a version number. Most of the needed
71 * functions work.
72 * (20/10/1999)
73 */
74
75#include <linux/sched/signal.h>
76#include <linux/signal.h>
77#include <linux/spinlock.h>
78#include <linux/errno.h>
79#include <linux/random.h>
80#include <linux/poll.h>
81#include <linux/init.h>
82#include <linux/slab.h>
83#include <linux/module.h>
84#include <linux/wait.h>
85#include <linux/mutex.h>
86
87#include <linux/usb.h>
88#include <linux/fs.h>
89
90/*
91 * Version Information
92 */
93#define DRIVER_VERSION "v0.7.5 (30/10/2000)"
94#define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>"
95#define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera"
96
97/* Vendor and Product Information */
98#define MDC800_VENDOR_ID 0x055f
99#define MDC800_PRODUCT_ID 0xa800
100
101/* Timeouts (msec) */
102#define TO_DOWNLOAD_GET_READY 1500
103#define TO_DOWNLOAD_GET_BUSY 1500
104#define TO_WRITE_GET_READY 1000
105#define TO_DEFAULT_COMMAND 5000
106#define TO_READ_FROM_IRQ TO_DEFAULT_COMMAND
107#define TO_GET_READY TO_DEFAULT_COMMAND
108
109/* Minor Number of the device (create with mknod /dev/mustek c 180 32) */
110#define MDC800_DEVICE_MINOR_BASE 32
111
112
113/**************************************************************************
114 Data and structs
115***************************************************************************/
116
117
118typedef enum {
119 NOT_CONNECTED, READY, WORKING, DOWNLOAD
120} mdc800_state;
121
122
123/* Data for the driver */
124struct mdc800_data
125{
126 struct usb_device * dev; // Device Data
127 mdc800_state state;
128
129 unsigned int endpoint [4];
130
131 struct urb * irq_urb;
132 wait_queue_head_t irq_wait;
133 int irq_woken;
134 char* irq_urb_buffer;
135
136 int camera_busy; // is camera busy ?
137 int camera_request_ready; // Status to synchronize with irq
138 char camera_response [8]; // last Bytes send after busy
139
140 struct urb * write_urb;
141 char* write_urb_buffer;
142 wait_queue_head_t write_wait;
143 int written;
144
145
146 struct urb * download_urb;
147 char* download_urb_buffer;
148 wait_queue_head_t download_wait;
149 int downloaded;
150 int download_left; // Bytes left to download ?
151
152
153 /* Device Data */
154 char out [64]; // Answer Buffer
155 int out_ptr; // Index to the first not readen byte
156 int out_count; // Bytes in the buffer
157
158 int open; // Camera device open ?
159 struct mutex io_lock; // IO -lock
160
161 char in [8]; // Command Input Buffer
162 int in_count;
163
164 int pic_index; // Cache for the Imagesize (-1 for nothing cached )
165 int pic_len;
166 int minor;
167};
168
169
170/* Specification of the Endpoints */
171static struct usb_endpoint_descriptor mdc800_ed [4] =
172{
173 {
174 .bLength = 0,
175 .bDescriptorType = 0,
176 .bEndpointAddress = 0x01,
177 .bmAttributes = 0x02,
178 .wMaxPacketSize = cpu_to_le16(8),
179 .bInterval = 0,
180 .bRefresh = 0,
181 .bSynchAddress = 0,
182 },
183 {
184 .bLength = 0,
185 .bDescriptorType = 0,
186 .bEndpointAddress = 0x82,
187 .bmAttributes = 0x03,
188 .wMaxPacketSize = cpu_to_le16(8),
189 .bInterval = 0,
190 .bRefresh = 0,
191 .bSynchAddress = 0,
192 },
193 {
194 .bLength = 0,
195 .bDescriptorType = 0,
196 .bEndpointAddress = 0x03,
197 .bmAttributes = 0x02,
198 .wMaxPacketSize = cpu_to_le16(64),
199 .bInterval = 0,
200 .bRefresh = 0,
201 .bSynchAddress = 0,
202 },
203 {
204 .bLength = 0,
205 .bDescriptorType = 0,
206 .bEndpointAddress = 0x84,
207 .bmAttributes = 0x02,
208 .wMaxPacketSize = cpu_to_le16(64),
209 .bInterval = 0,
210 .bRefresh = 0,
211 .bSynchAddress = 0,
212 },
213};
214
215/* The Variable used by the driver */
216static struct mdc800_data* mdc800;
217
218
219/***************************************************************************
220 The USB Part of the driver
221****************************************************************************/
222
223static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b)
224{
225 return (
226 ( a->bEndpointAddress == b->bEndpointAddress )
227 && ( a->bmAttributes == b->bmAttributes )
228 && ( a->wMaxPacketSize == b->wMaxPacketSize )
229 );
230}
231
232
233/*
234 * Checks whether the camera responds busy
235 */
236static int mdc800_isBusy (char* ch)
237{
238 int i=0;
239 while (i<8)
240 {
241 if (ch [i] != (char)0x99)
242 return 0;
243 i++;
244 }
245 return 1;
246}
247
248
249/*
250 * Checks whether the Camera is ready
251 */
252static int mdc800_isReady (char *ch)
253{
254 int i=0;
255 while (i<8)
256 {
257 if (ch [i] != (char)0xbb)
258 return 0;
259 i++;
260 }
261 return 1;
262}
263
264
265
266/*
267 * USB IRQ Handler for InputLine
268 */
269static void mdc800_usb_irq (struct urb *urb)
270{
271 int data_received=0, wake_up;
272 unsigned char* b=urb->transfer_buffer;
273 struct mdc800_data* mdc800=urb->context;
274 struct device *dev = &mdc800->dev->dev;
275 int status = urb->status;
276
277 if (status >= 0) {
278 if (mdc800_isBusy (b))
279 {
280 if (!mdc800->camera_busy)
281 {
282 mdc800->camera_busy=1;
283 dev_dbg(dev, "gets busy\n");
284 }
285 }
286 else
287 {
288 if (mdc800->camera_busy && mdc800_isReady (b))
289 {
290 mdc800->camera_busy=0;
291 dev_dbg(dev, "gets ready\n");
292 }
293 }
294 if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
295 {
296 /* Store Data in camera_answer field */
297 dev_dbg(dev, "%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]);
298
299 memcpy (mdc800->camera_response,b,8);
300 data_received=1;
301 }
302 }
303 wake_up= ( mdc800->camera_request_ready > 0 )
304 &&
305 (
306 ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
307 ||
308 ((mdc800->camera_request_ready == 2) && data_received)
309 ||
310 ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
311 ||
312 (status < 0)
313 );
314
315 if (wake_up)
316 {
317 mdc800->camera_request_ready=0;
318 mdc800->irq_woken=1;
319 wake_up (&mdc800->irq_wait);
320 }
321}
322
323
324/*
325 * Waits a while until the irq responds that camera is ready
326 *
327 * mode : 0: Wait for camera gets ready
328 * 1: Wait for receiving data
329 * 2: Wait for camera gets busy
330 *
331 * msec: Time to wait
332 */
333static int mdc800_usb_waitForIRQ (int mode, int msec)
334{
335 mdc800->camera_request_ready=1+mode;
336
337 wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken,
338 msecs_to_jiffies(msec));
339 mdc800->irq_woken = 0;
340
341 if (mdc800->camera_request_ready>0)
342 {
343 mdc800->camera_request_ready=0;
344 dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n");
345 return -1;
346 }
347
348 if (mdc800->state == NOT_CONNECTED)
349 {
350 printk(KERN_WARNING "mdc800: Camera gets disconnected "
351 "during waiting for irq.\n");
352 mdc800->camera_request_ready=0;
353 return -2;
354 }
355
356 return 0;
357}
358
359
360/*
361 * The write_urb callback function
362 */
363static void mdc800_usb_write_notify (struct urb *urb)
364{
365 struct mdc800_data* mdc800=urb->context;
366 int status = urb->status;
367
368 if (status != 0)
369 dev_err(&mdc800->dev->dev,
370 "writing command fails (status=%i)\n", status);
371 else
372 mdc800->state=READY;
373 mdc800->written = 1;
374 wake_up (&mdc800->write_wait);
375}
376
377
378/*
379 * The download_urb callback function
380 */
381static void mdc800_usb_download_notify (struct urb *urb)
382{
383 struct mdc800_data* mdc800=urb->context;
384 int status = urb->status;
385
386 if (status == 0) {
387 /* Fill output buffer with these data */
388 memcpy (mdc800->out, urb->transfer_buffer, 64);
389 mdc800->out_count=64;
390 mdc800->out_ptr=0;
391 mdc800->download_left-=64;
392 if (mdc800->download_left == 0)
393 {
394 mdc800->state=READY;
395 }
396 } else {
397 dev_err(&mdc800->dev->dev,
398 "request bytes fails (status:%i)\n", status);
399 }
400 mdc800->downloaded = 1;
401 wake_up (&mdc800->download_wait);
402}
403
404
405/***************************************************************************
406 Probing for the Camera
407 ***************************************************************************/
408
409static struct usb_driver mdc800_usb_driver;
410static const struct file_operations mdc800_device_ops;
411static struct usb_class_driver mdc800_class = {
412 .name = "mdc800%d",
413 .fops = &mdc800_device_ops,
414 .minor_base = MDC800_DEVICE_MINOR_BASE,
415};
416
417
418/*
419 * Callback to search the Mustek MDC800 on the USB Bus
420 */
421static int mdc800_usb_probe (struct usb_interface *intf,
422 const struct usb_device_id *id)
423{
424 int i,j;
425 struct usb_host_interface *intf_desc;
426 struct usb_device *dev = interface_to_usbdev (intf);
427 int irq_interval=0;
428 int retval;
429
430 dev_dbg(&intf->dev, "(%s) called.\n", __func__);
431
432
433 if (mdc800->dev != NULL)
434 {
435 dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n");
436 return -ENODEV;
437 }
438
439 if (dev->descriptor.bNumConfigurations != 1)
440 {
441 dev_err(&intf->dev,
442 "probe fails -> wrong Number of Configuration\n");
443 return -ENODEV;
444 }
445 intf_desc = intf->cur_altsetting;
446
447 if (
448 ( intf_desc->desc.bInterfaceClass != 0xff )
449 || ( intf_desc->desc.bInterfaceSubClass != 0 )
450 || ( intf_desc->desc.bInterfaceProtocol != 0 )
451 || ( intf_desc->desc.bNumEndpoints != 4)
452 )
453 {
454 dev_err(&intf->dev, "probe fails -> wrong Interface\n");
455 return -ENODEV;
456 }
457
458 /* Check the Endpoints */
459 for (i=0; i<4; i++)
460 {
461 mdc800->endpoint[i]=-1;
462 for (j=0; j<4; j++)
463 {
464 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
465 {
466 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
467 if (i==1)
468 {
469 irq_interval=intf_desc->endpoint [j].desc.bInterval;
470 }
471 }
472 }
473 if (mdc800->endpoint[i] == -1)
474 {
475 dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n");
476 return -ENODEV;
477 }
478 }
479
480
481 dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n");
482
483 mutex_lock(&mdc800->io_lock);
484
485 retval = usb_register_dev(intf, &mdc800_class);
486 if (retval) {
487 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
488 mutex_unlock(&mdc800->io_lock);
489 return -ENODEV;
490 }
491
492 mdc800->dev=dev;
493 mdc800->open=0;
494
495 /* Setup URB Structs */
496 usb_fill_int_urb (
497 mdc800->irq_urb,
498 mdc800->dev,
499 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
500 mdc800->irq_urb_buffer,
501 8,
502 mdc800_usb_irq,
503 mdc800,
504 irq_interval
505 );
506
507 usb_fill_bulk_urb (
508 mdc800->write_urb,
509 mdc800->dev,
510 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
511 mdc800->write_urb_buffer,
512 8,
513 mdc800_usb_write_notify,
514 mdc800
515 );
516
517 usb_fill_bulk_urb (
518 mdc800->download_urb,
519 mdc800->dev,
520 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
521 mdc800->download_urb_buffer,
522 64,
523 mdc800_usb_download_notify,
524 mdc800
525 );
526
527 mdc800->state=READY;
528
529 mutex_unlock(&mdc800->io_lock);
530
531 usb_set_intfdata(intf, mdc800);
532 return 0;
533}
534
535
536/*
537 * Disconnect USB device (maybe the MDC800)
538 */
539static void mdc800_usb_disconnect (struct usb_interface *intf)
540{
541 struct mdc800_data* mdc800 = usb_get_intfdata(intf);
542
543 dev_dbg(&intf->dev, "(%s) called\n", __func__);
544
545 if (mdc800) {
546 if (mdc800->state == NOT_CONNECTED)
547 return;
548
549 usb_deregister_dev(intf, &mdc800_class);
550
551 /* must be under lock to make sure no URB
552 is submitted after usb_kill_urb() */
553 mutex_lock(&mdc800->io_lock);
554 mdc800->state=NOT_CONNECTED;
555
556 usb_kill_urb(mdc800->irq_urb);
557 usb_kill_urb(mdc800->write_urb);
558 usb_kill_urb(mdc800->download_urb);
559 mutex_unlock(&mdc800->io_lock);
560
561 mdc800->dev = NULL;
562 usb_set_intfdata(intf, NULL);
563 }
564 dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n");
565}
566
567
568/***************************************************************************
569 The Misc device Part (file_operations)
570****************************************************************************/
571
572/*
573 * This Function calc the Answersize for a command.
574 */
575static int mdc800_getAnswerSize (char command)
576{
577 switch ((unsigned char) command)
578 {
579 case 0x2a:
580 case 0x49:
581 case 0x51:
582 case 0x0d:
583 case 0x20:
584 case 0x07:
585 case 0x01:
586 case 0x25:
587 case 0x00:
588 return 8;
589
590 case 0x05:
591 case 0x3e:
592 return mdc800->pic_len;
593
594 case 0x09:
595 return 4096;
596
597 default:
598 return 0;
599 }
600}
601
602
603/*
604 * Init the device: (1) alloc mem (2) Increase MOD Count ..
605 */
606static int mdc800_device_open (struct inode* inode, struct file *file)
607{
608 int retval=0;
609 int errn=0;
610
611 mutex_lock(&mdc800->io_lock);
612
613 if (mdc800->state == NOT_CONNECTED)
614 {
615 errn=-EBUSY;
616 goto error_out;
617 }
618 if (mdc800->open)
619 {
620 errn=-EBUSY;
621 goto error_out;
622 }
623
624 mdc800->in_count=0;
625 mdc800->out_count=0;
626 mdc800->out_ptr=0;
627 mdc800->pic_index=0;
628 mdc800->pic_len=-1;
629 mdc800->download_left=0;
630
631 mdc800->camera_busy=0;
632 mdc800->camera_request_ready=0;
633
634 retval=0;
635 mdc800->irq_urb->dev = mdc800->dev;
636 retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL);
637 if (retval) {
638 dev_err(&mdc800->dev->dev,
639 "request USB irq fails (submit_retval=%i).\n", retval);
640 errn = -EIO;
641 goto error_out;
642 }
643
644 mdc800->open=1;
645 dev_dbg(&mdc800->dev->dev, "Mustek MDC800 device opened.\n");
646
647error_out:
648 mutex_unlock(&mdc800->io_lock);
649 return errn;
650}
651
652
653/*
654 * Close the Camera and release Memory
655 */
656static int mdc800_device_release (struct inode* inode, struct file *file)
657{
658 int retval=0;
659
660 mutex_lock(&mdc800->io_lock);
661 if (mdc800->open && (mdc800->state != NOT_CONNECTED))
662 {
663 usb_kill_urb(mdc800->irq_urb);
664 usb_kill_urb(mdc800->write_urb);
665 usb_kill_urb(mdc800->download_urb);
666 mdc800->open=0;
667 }
668 else
669 {
670 retval=-EIO;
671 }
672
673 mutex_unlock(&mdc800->io_lock);
674 return retval;
675}
676
677
678/*
679 * The Device read callback Function
680 */
681static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
682{
683 size_t left=len, sts=len; /* single transfer size */
684 char __user *ptr = buf;
685 int retval;
686
687 mutex_lock(&mdc800->io_lock);
688 if (mdc800->state == NOT_CONNECTED)
689 {
690 mutex_unlock(&mdc800->io_lock);
691 return -EBUSY;
692 }
693 if (mdc800->state == WORKING)
694 {
695 printk(KERN_WARNING "mdc800: Illegal State \"working\""
696 "reached during read ?!\n");
697 mutex_unlock(&mdc800->io_lock);
698 return -EBUSY;
699 }
700 if (!mdc800->open)
701 {
702 mutex_unlock(&mdc800->io_lock);
703 return -EBUSY;
704 }
705
706 while (left)
707 {
708 if (signal_pending (current))
709 {
710 mutex_unlock(&mdc800->io_lock);
711 return -EINTR;
712 }
713
714 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
715
716 if (sts <= 0)
717 {
718 /* Too less Data in buffer */
719 if (mdc800->state == DOWNLOAD)
720 {
721 mdc800->out_count=0;
722 mdc800->out_ptr=0;
723
724 /* Download -> Request new bytes */
725 mdc800->download_urb->dev = mdc800->dev;
726 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL);
727 if (retval) {
728 dev_err(&mdc800->dev->dev,
729 "Can't submit download urb "
730 "(retval=%i)\n", retval);
731 mutex_unlock(&mdc800->io_lock);
732 return len-left;
733 }
734 wait_event_timeout(mdc800->download_wait,
735 mdc800->downloaded,
736 msecs_to_jiffies(TO_DOWNLOAD_GET_READY));
737 mdc800->downloaded = 0;
738 if (mdc800->download_urb->status != 0)
739 {
740 dev_err(&mdc800->dev->dev,
741 "request download-bytes fails "
742 "(status=%i)\n",
743 mdc800->download_urb->status);
744 mutex_unlock(&mdc800->io_lock);
745 return len-left;
746 }
747 }
748 else
749 {
750 /* No more bytes -> that's an error*/
751 mutex_unlock(&mdc800->io_lock);
752 return -EIO;
753 }
754 }
755 else
756 {
757 /* Copy Bytes */
758 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
759 sts)) {
760 mutex_unlock(&mdc800->io_lock);
761 return -EFAULT;
762 }
763 ptr+=sts;
764 left-=sts;
765 mdc800->out_ptr+=sts;
766 }
767 }
768
769 mutex_unlock(&mdc800->io_lock);
770 return len-left;
771}
772
773
774/*
775 * The Device write callback Function
776 * If a 8Byte Command is received, it will be send to the camera.
777 * After this the driver initiates the request for the answer or
778 * just waits until the camera becomes ready.
779 */
780static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
781{
782 size_t i=0;
783 int retval;
784
785 mutex_lock(&mdc800->io_lock);
786 if (mdc800->state != READY)
787 {
788 mutex_unlock(&mdc800->io_lock);
789 return -EBUSY;
790 }
791 if (!mdc800->open )
792 {
793 mutex_unlock(&mdc800->io_lock);
794 return -EBUSY;
795 }
796
797 while (i<len)
798 {
799 unsigned char c;
800 if (signal_pending (current))
801 {
802 mutex_unlock(&mdc800->io_lock);
803 return -EINTR;
804 }
805
806 if(get_user(c, buf+i))
807 {
808 mutex_unlock(&mdc800->io_lock);
809 return -EFAULT;
810 }
811
812 /* check for command start */
813 if (c == 0x55)
814 {
815 mdc800->in_count=0;
816 mdc800->out_count=0;
817 mdc800->out_ptr=0;
818 mdc800->download_left=0;
819 }
820
821 /* save command byte */
822 if (mdc800->in_count < 8)
823 {
824 mdc800->in[mdc800->in_count] = c;
825 mdc800->in_count++;
826 }
827 else
828 {
829 mutex_unlock(&mdc800->io_lock);
830 return -EIO;
831 }
832
833 /* Command Buffer full ? -> send it to camera */
834 if (mdc800->in_count == 8)
835 {
836 int answersize;
837
838 if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
839 {
840 dev_err(&mdc800->dev->dev,
841 "Camera didn't get ready.\n");
842 mutex_unlock(&mdc800->io_lock);
843 return -EIO;
844 }
845
846 answersize=mdc800_getAnswerSize (mdc800->in[1]);
847
848 mdc800->state=WORKING;
849 memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
850 mdc800->write_urb->dev = mdc800->dev;
851 retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL);
852 if (retval) {
853 dev_err(&mdc800->dev->dev,
854 "submitting write urb fails "
855 "(retval=%i)\n", retval);
856 mutex_unlock(&mdc800->io_lock);
857 return -EIO;
858 }
859 wait_event_timeout(mdc800->write_wait, mdc800->written,
860 msecs_to_jiffies(TO_WRITE_GET_READY));
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 dev_err(&mdc800->dev->dev,
876 "call 0x07 before "
877 "0x05,0x3e\n");
878 mdc800->state=READY;
879 mutex_unlock(&mdc800->io_lock);
880 return -EIO;
881 }
882 mdc800->pic_len=-1;
883 fallthrough;
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 dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n");
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 dev_dbg(&mdc800->dev->dev, "cached imagesize = %i\n", mdc800->pic_len);
919 }
920
921 }
922 else
923 {
924 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
925 {
926 dev_err(&mdc800->dev->dev, "Command Timeout.\n");
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 */
947static 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 .llseek = noop_llseek,
955};
956
957
958
959static const struct usb_device_id mdc800_table[] = {
960 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
961 { } /* Terminating entry */
962};
963
964MODULE_DEVICE_TABLE (usb, mdc800_table);
965/*
966 * USB Driver Struct for this device
967 */
968static struct usb_driver mdc800_usb_driver =
969{
970 .name = "mdc800",
971 .probe = mdc800_usb_probe,
972 .disconnect = mdc800_usb_disconnect,
973 .id_table = mdc800_table
974};
975
976
977
978/************************************************************************
979 Init and Cleanup this driver (Main Functions)
980*************************************************************************/
981
982static int __init usb_mdc800_init (void)
983{
984 int retval = -ENODEV;
985 /* Allocate Memory */
986 mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
987 if (!mdc800)
988 goto cleanup_on_fail;
989
990 mdc800->dev = NULL;
991 mdc800->state=NOT_CONNECTED;
992 mutex_init (&mdc800->io_lock);
993
994 init_waitqueue_head (&mdc800->irq_wait);
995 init_waitqueue_head (&mdc800->write_wait);
996 init_waitqueue_head (&mdc800->download_wait);
997
998 mdc800->irq_woken = 0;
999 mdc800->downloaded = 0;
1000 mdc800->written = 0;
1001
1002 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1003 if (!mdc800->irq_urb_buffer)
1004 goto cleanup_on_fail;
1005 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1006 if (!mdc800->write_urb_buffer)
1007 goto cleanup_on_fail;
1008 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1009 if (!mdc800->download_urb_buffer)
1010 goto cleanup_on_fail;
1011
1012 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1013 if (!mdc800->irq_urb)
1014 goto cleanup_on_fail;
1015 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1016 if (!mdc800->download_urb)
1017 goto cleanup_on_fail;
1018 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1019 if (!mdc800->write_urb)
1020 goto cleanup_on_fail;
1021
1022 /* Register the driver */
1023 retval = usb_register(&mdc800_usb_driver);
1024 if (retval)
1025 goto cleanup_on_fail;
1026
1027 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1028 DRIVER_DESC "\n");
1029
1030 return 0;
1031
1032 /* Clean driver up, when something fails */
1033
1034cleanup_on_fail:
1035
1036 if (mdc800 != NULL)
1037 {
1038 printk(KERN_ERR "mdc800: can't alloc memory!\n");
1039
1040 kfree(mdc800->download_urb_buffer);
1041 kfree(mdc800->write_urb_buffer);
1042 kfree(mdc800->irq_urb_buffer);
1043
1044 usb_free_urb(mdc800->write_urb);
1045 usb_free_urb(mdc800->download_urb);
1046 usb_free_urb(mdc800->irq_urb);
1047
1048 kfree (mdc800);
1049 }
1050 mdc800 = NULL;
1051 return retval;
1052}
1053
1054
1055static void __exit usb_mdc800_cleanup (void)
1056{
1057 usb_deregister (&mdc800_usb_driver);
1058
1059 usb_free_urb (mdc800->irq_urb);
1060 usb_free_urb (mdc800->download_urb);
1061 usb_free_urb (mdc800->write_urb);
1062
1063 kfree (mdc800->irq_urb_buffer);
1064 kfree (mdc800->write_urb_buffer);
1065 kfree (mdc800->download_urb_buffer);
1066
1067 kfree (mdc800);
1068 mdc800 = NULL;
1069}
1070
1071module_init (usb_mdc800_init);
1072module_exit (usb_mdc800_cleanup);
1073
1074MODULE_AUTHOR( DRIVER_AUTHOR );
1075MODULE_DESCRIPTION( DRIVER_DESC );
1076MODULE_LICENSE("GPL");
1077
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
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 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 */
184static struct usb_endpoint_descriptor mdc800_ed [4] =
185{
186 {
187 .bLength = 0,
188 .bDescriptorType = 0,
189 .bEndpointAddress = 0x01,
190 .bmAttributes = 0x02,
191 .wMaxPacketSize = 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 = 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 = 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 = 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)
283{
284 int data_received=0, wake_up;
285 unsigned char* b=urb->transfer_buffer;
286 struct mdc800_data* mdc800=urb->context;
287 struct device *dev = &mdc800->dev->dev;
288 int status = urb->status;
289
290 if (status >= 0) {
291 if (mdc800_isBusy (b))
292 {
293 if (!mdc800->camera_busy)
294 {
295 mdc800->camera_busy=1;
296 dev_dbg(dev, "gets busy\n");
297 }
298 }
299 else
300 {
301 if (mdc800->camera_busy && mdc800_isReady (b))
302 {
303 mdc800->camera_busy=0;
304 dev_dbg(dev, "gets ready\n");
305 }
306 }
307 if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
308 {
309 /* Store Data in camera_answer field */
310 dev_dbg(dev, "%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]);
311
312 memcpy (mdc800->camera_response,b,8);
313 data_received=1;
314 }
315 }
316 wake_up= ( mdc800->camera_request_ready > 0 )
317 &&
318 (
319 ((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
320 ||
321 ((mdc800->camera_request_ready == 2) && data_received)
322 ||
323 ((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
324 ||
325 (status < 0)
326 );
327
328 if (wake_up)
329 {
330 mdc800->camera_request_ready=0;
331 mdc800->irq_woken=1;
332 wake_up (&mdc800->irq_wait);
333 }
334}
335
336
337/*
338 * Waits a while until the irq responds that camera is ready
339 *
340 * mode : 0: Wait for camera gets ready
341 * 1: Wait for receiving data
342 * 2: Wait for camera gets busy
343 *
344 * msec: Time to wait
345 */
346static int mdc800_usb_waitForIRQ (int mode, int msec)
347{
348 mdc800->camera_request_ready=1+mode;
349
350 wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken, msec*HZ/1000);
351 mdc800->irq_woken = 0;
352
353 if (mdc800->camera_request_ready>0)
354 {
355 mdc800->camera_request_ready=0;
356 dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n");
357 return -1;
358 }
359
360 if (mdc800->state == NOT_CONNECTED)
361 {
362 printk(KERN_WARNING "mdc800: Camera gets disconnected "
363 "during waiting for irq.\n");
364 mdc800->camera_request_ready=0;
365 return -2;
366 }
367
368 return 0;
369}
370
371
372/*
373 * The write_urb callback function
374 */
375static void mdc800_usb_write_notify (struct urb *urb)
376{
377 struct mdc800_data* mdc800=urb->context;
378 int status = urb->status;
379
380 if (status != 0)
381 dev_err(&mdc800->dev->dev,
382 "writing command fails (status=%i)\n", status);
383 else
384 mdc800->state=READY;
385 mdc800->written = 1;
386 wake_up (&mdc800->write_wait);
387}
388
389
390/*
391 * The download_urb callback function
392 */
393static void mdc800_usb_download_notify (struct urb *urb)
394{
395 struct mdc800_data* mdc800=urb->context;
396 int status = urb->status;
397
398 if (status == 0) {
399 /* Fill output buffer with these data */
400 memcpy (mdc800->out, urb->transfer_buffer, 64);
401 mdc800->out_count=64;
402 mdc800->out_ptr=0;
403 mdc800->download_left-=64;
404 if (mdc800->download_left == 0)
405 {
406 mdc800->state=READY;
407 }
408 } else {
409 dev_err(&mdc800->dev->dev,
410 "request bytes fails (status:%i)\n", status);
411 }
412 mdc800->downloaded = 1;
413 wake_up (&mdc800->download_wait);
414}
415
416
417/***************************************************************************
418 Probing for the Camera
419 ***************************************************************************/
420
421static struct usb_driver mdc800_usb_driver;
422static const struct file_operations mdc800_device_ops;
423static struct usb_class_driver mdc800_class = {
424 .name = "mdc800%d",
425 .fops = &mdc800_device_ops,
426 .minor_base = MDC800_DEVICE_MINOR_BASE,
427};
428
429
430/*
431 * Callback to search the Mustek MDC800 on the USB Bus
432 */
433static int mdc800_usb_probe (struct usb_interface *intf,
434 const struct usb_device_id *id)
435{
436 int i,j;
437 struct usb_host_interface *intf_desc;
438 struct usb_device *dev = interface_to_usbdev (intf);
439 int irq_interval=0;
440 int retval;
441
442 dev_dbg(&intf->dev, "(%s) called.\n", __func__);
443
444
445 if (mdc800->dev != NULL)
446 {
447 dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n");
448 return -ENODEV;
449 }
450
451 if (dev->descriptor.bNumConfigurations != 1)
452 {
453 dev_err(&intf->dev,
454 "probe fails -> wrong Number of Configuration\n");
455 return -ENODEV;
456 }
457 intf_desc = intf->cur_altsetting;
458
459 if (
460 ( intf_desc->desc.bInterfaceClass != 0xff )
461 || ( intf_desc->desc.bInterfaceSubClass != 0 )
462 || ( intf_desc->desc.bInterfaceProtocol != 0 )
463 || ( intf_desc->desc.bNumEndpoints != 4)
464 )
465 {
466 dev_err(&intf->dev, "probe fails -> wrong Interface\n");
467 return -ENODEV;
468 }
469
470 /* Check the Endpoints */
471 for (i=0; i<4; i++)
472 {
473 mdc800->endpoint[i]=-1;
474 for (j=0; j<4; j++)
475 {
476 if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
477 {
478 mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
479 if (i==1)
480 {
481 irq_interval=intf_desc->endpoint [j].desc.bInterval;
482 }
483 }
484 }
485 if (mdc800->endpoint[i] == -1)
486 {
487 dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n");
488 return -ENODEV;
489 }
490 }
491
492
493 dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n");
494
495 mutex_lock(&mdc800->io_lock);
496
497 retval = usb_register_dev(intf, &mdc800_class);
498 if (retval) {
499 dev_err(&intf->dev, "Not able to get a minor for this device.\n");
500 mutex_unlock(&mdc800->io_lock);
501 return -ENODEV;
502 }
503
504 mdc800->dev=dev;
505 mdc800->open=0;
506
507 /* Setup URB Structs */
508 usb_fill_int_urb (
509 mdc800->irq_urb,
510 mdc800->dev,
511 usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
512 mdc800->irq_urb_buffer,
513 8,
514 mdc800_usb_irq,
515 mdc800,
516 irq_interval
517 );
518
519 usb_fill_bulk_urb (
520 mdc800->write_urb,
521 mdc800->dev,
522 usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
523 mdc800->write_urb_buffer,
524 8,
525 mdc800_usb_write_notify,
526 mdc800
527 );
528
529 usb_fill_bulk_urb (
530 mdc800->download_urb,
531 mdc800->dev,
532 usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
533 mdc800->download_urb_buffer,
534 64,
535 mdc800_usb_download_notify,
536 mdc800
537 );
538
539 mdc800->state=READY;
540
541 mutex_unlock(&mdc800->io_lock);
542
543 usb_set_intfdata(intf, mdc800);
544 return 0;
545}
546
547
548/*
549 * Disconnect USB device (maybe the MDC800)
550 */
551static void mdc800_usb_disconnect (struct usb_interface *intf)
552{
553 struct mdc800_data* mdc800 = usb_get_intfdata(intf);
554
555 dev_dbg(&intf->dev, "(%s) called\n", __func__);
556
557 if (mdc800) {
558 if (mdc800->state == NOT_CONNECTED)
559 return;
560
561 usb_deregister_dev(intf, &mdc800_class);
562
563 /* must be under lock to make sure no URB
564 is submitted after usb_kill_urb() */
565 mutex_lock(&mdc800->io_lock);
566 mdc800->state=NOT_CONNECTED;
567
568 usb_kill_urb(mdc800->irq_urb);
569 usb_kill_urb(mdc800->write_urb);
570 usb_kill_urb(mdc800->download_urb);
571 mutex_unlock(&mdc800->io_lock);
572
573 mdc800->dev = NULL;
574 usb_set_intfdata(intf, NULL);
575 }
576 dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n");
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 mutex_lock(&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 retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL);
649 if (retval) {
650 dev_err(&mdc800->dev->dev,
651 "request USB irq fails (submit_retval=%i).\n", retval);
652 errn = -EIO;
653 goto error_out;
654 }
655
656 mdc800->open=1;
657 dev_dbg(&mdc800->dev->dev, "Mustek MDC800 device opened.\n");
658
659error_out:
660 mutex_unlock(&mdc800->io_lock);
661 return errn;
662}
663
664
665/*
666 * Close the Camera and release Memory
667 */
668static int mdc800_device_release (struct inode* inode, struct file *file)
669{
670 int retval=0;
671
672 mutex_lock(&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 mutex_unlock(&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 int retval;
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 printk(KERN_WARNING "mdc800: Illegal State \"working\""
708 "reached during read ?!\n");
709 mutex_unlock(&mdc800->io_lock);
710 return -EBUSY;
711 }
712 if (!mdc800->open)
713 {
714 mutex_unlock(&mdc800->io_lock);
715 return -EBUSY;
716 }
717
718 while (left)
719 {
720 if (signal_pending (current))
721 {
722 mutex_unlock(&mdc800->io_lock);
723 return -EINTR;
724 }
725
726 sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
727
728 if (sts <= 0)
729 {
730 /* Too less Data in buffer */
731 if (mdc800->state == DOWNLOAD)
732 {
733 mdc800->out_count=0;
734 mdc800->out_ptr=0;
735
736 /* Download -> Request new bytes */
737 mdc800->download_urb->dev = mdc800->dev;
738 retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL);
739 if (retval) {
740 dev_err(&mdc800->dev->dev,
741 "Can't submit download urb "
742 "(retval=%i)\n", retval);
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 dev_err(&mdc800->dev->dev,
752 "request download-bytes fails "
753 "(status=%i)\n",
754 mdc800->download_urb->status);
755 mutex_unlock(&mdc800->io_lock);
756 return len-left;
757 }
758 }
759 else
760 {
761 /* No more bytes -> that's an error*/
762 mutex_unlock(&mdc800->io_lock);
763 return -EIO;
764 }
765 }
766 else
767 {
768 /* Copy Bytes */
769 if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
770 sts)) {
771 mutex_unlock(&mdc800->io_lock);
772 return -EFAULT;
773 }
774 ptr+=sts;
775 left-=sts;
776 mdc800->out_ptr+=sts;
777 }
778 }
779
780 mutex_unlock(&mdc800->io_lock);
781 return len-left;
782}
783
784
785/*
786 * The Device write callback Function
787 * If a 8Byte Command is received, it will be send to the camera.
788 * After this the driver initiates the request for the answer or
789 * just waits until the camera becomes ready.
790 */
791static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
792{
793 size_t i=0;
794 int retval;
795
796 mutex_lock(&mdc800->io_lock);
797 if (mdc800->state != READY)
798 {
799 mutex_unlock(&mdc800->io_lock);
800 return -EBUSY;
801 }
802 if (!mdc800->open )
803 {
804 mutex_unlock(&mdc800->io_lock);
805 return -EBUSY;
806 }
807
808 while (i<len)
809 {
810 unsigned char c;
811 if (signal_pending (current))
812 {
813 mutex_unlock(&mdc800->io_lock);
814 return -EINTR;
815 }
816
817 if(get_user(c, buf+i))
818 {
819 mutex_unlock(&mdc800->io_lock);
820 return -EFAULT;
821 }
822
823 /* check for command start */
824 if (c == 0x55)
825 {
826 mdc800->in_count=0;
827 mdc800->out_count=0;
828 mdc800->out_ptr=0;
829 mdc800->download_left=0;
830 }
831
832 /* save command byte */
833 if (mdc800->in_count < 8)
834 {
835 mdc800->in[mdc800->in_count] = c;
836 mdc800->in_count++;
837 }
838 else
839 {
840 mutex_unlock(&mdc800->io_lock);
841 return -EIO;
842 }
843
844 /* Command Buffer full ? -> send it to camera */
845 if (mdc800->in_count == 8)
846 {
847 int answersize;
848
849 if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
850 {
851 dev_err(&mdc800->dev->dev,
852 "Camera didn't get ready.\n");
853 mutex_unlock(&mdc800->io_lock);
854 return -EIO;
855 }
856
857 answersize=mdc800_getAnswerSize (mdc800->in[1]);
858
859 mdc800->state=WORKING;
860 memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
861 mdc800->write_urb->dev = mdc800->dev;
862 retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL);
863 if (retval) {
864 dev_err(&mdc800->dev->dev,
865 "submitting write urb fails "
866 "(retval=%i)\n", retval);
867 mutex_unlock(&mdc800->io_lock);
868 return -EIO;
869 }
870 wait_event_timeout(mdc800->write_wait, mdc800->written, TO_WRITE_GET_READY*HZ/1000);
871 mdc800->written = 0;
872 if (mdc800->state == WORKING)
873 {
874 usb_kill_urb(mdc800->write_urb);
875 mutex_unlock(&mdc800->io_lock);
876 return -EIO;
877 }
878
879 switch ((unsigned char) mdc800->in[1])
880 {
881 case 0x05: /* Download Image */
882 case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
883 if (mdc800->pic_len < 0)
884 {
885 dev_err(&mdc800->dev->dev,
886 "call 0x07 before "
887 "0x05,0x3e\n");
888 mdc800->state=READY;
889 mutex_unlock(&mdc800->io_lock);
890 return -EIO;
891 }
892 mdc800->pic_len=-1;
893
894 case 0x09: /* Download Thumbnail */
895 mdc800->download_left=answersize+64;
896 mdc800->state=DOWNLOAD;
897 mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
898 break;
899
900
901 default:
902 if (answersize)
903 {
904
905 if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
906 {
907 dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n");
908 mutex_unlock(&mdc800->io_lock);
909 return -EIO;
910 }
911
912 /* Write dummy data, (this is ugly but part of the USB Protocol */
913 /* if you use endpoint 1 as bulk and not as irq) */
914 memcpy (mdc800->out, mdc800->camera_response,8);
915
916 /* This is the interpreted answer */
917 memcpy (&mdc800->out[8], mdc800->camera_response,8);
918
919 mdc800->out_ptr=0;
920 mdc800->out_count=16;
921
922 /* Cache the Imagesize, if command was getImageSize */
923 if (mdc800->in [1] == (char) 0x07)
924 {
925 mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
926
927 dev_dbg(&mdc800->dev->dev, "cached imagesize = %i\n", mdc800->pic_len);
928 }
929
930 }
931 else
932 {
933 if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
934 {
935 dev_err(&mdc800->dev->dev, "Command Timeout.\n");
936 mutex_unlock(&mdc800->io_lock);
937 return -EIO;
938 }
939 }
940 mdc800->state=READY;
941 break;
942 }
943 }
944 i++;
945 }
946 mutex_unlock(&mdc800->io_lock);
947 return i;
948}
949
950
951/***************************************************************************
952 Init and Cleanup this driver (Structs and types)
953****************************************************************************/
954
955/* File Operations of this drivers */
956static const struct file_operations mdc800_device_ops =
957{
958 .owner = THIS_MODULE,
959 .read = mdc800_device_read,
960 .write = mdc800_device_write,
961 .open = mdc800_device_open,
962 .release = mdc800_device_release,
963 .llseek = noop_llseek,
964};
965
966
967
968static const struct usb_device_id mdc800_table[] = {
969 { USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
970 { } /* Terminating entry */
971};
972
973MODULE_DEVICE_TABLE (usb, mdc800_table);
974/*
975 * USB Driver Struct for this device
976 */
977static struct usb_driver mdc800_usb_driver =
978{
979 .name = "mdc800",
980 .probe = mdc800_usb_probe,
981 .disconnect = mdc800_usb_disconnect,
982 .id_table = mdc800_table
983};
984
985
986
987/************************************************************************
988 Init and Cleanup this driver (Main Functions)
989*************************************************************************/
990
991static int __init usb_mdc800_init (void)
992{
993 int retval = -ENODEV;
994 /* Allocate Memory */
995 mdc800=kzalloc (sizeof (struct mdc800_data), GFP_KERNEL);
996 if (!mdc800)
997 goto cleanup_on_fail;
998
999 mdc800->dev = NULL;
1000 mdc800->state=NOT_CONNECTED;
1001 mutex_init (&mdc800->io_lock);
1002
1003 init_waitqueue_head (&mdc800->irq_wait);
1004 init_waitqueue_head (&mdc800->write_wait);
1005 init_waitqueue_head (&mdc800->download_wait);
1006
1007 mdc800->irq_woken = 0;
1008 mdc800->downloaded = 0;
1009 mdc800->written = 0;
1010
1011 mdc800->irq_urb_buffer=kmalloc (8, GFP_KERNEL);
1012 if (!mdc800->irq_urb_buffer)
1013 goto cleanup_on_fail;
1014 mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
1015 if (!mdc800->write_urb_buffer)
1016 goto cleanup_on_fail;
1017 mdc800->download_urb_buffer=kmalloc (64, GFP_KERNEL);
1018 if (!mdc800->download_urb_buffer)
1019 goto cleanup_on_fail;
1020
1021 mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
1022 if (!mdc800->irq_urb)
1023 goto cleanup_on_fail;
1024 mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
1025 if (!mdc800->download_urb)
1026 goto cleanup_on_fail;
1027 mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
1028 if (!mdc800->write_urb)
1029 goto cleanup_on_fail;
1030
1031 /* Register the driver */
1032 retval = usb_register(&mdc800_usb_driver);
1033 if (retval)
1034 goto cleanup_on_fail;
1035
1036 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1037 DRIVER_DESC "\n");
1038
1039 return 0;
1040
1041 /* Clean driver up, when something fails */
1042
1043cleanup_on_fail:
1044
1045 if (mdc800 != NULL)
1046 {
1047 printk(KERN_ERR "mdc800: can't alloc memory!\n");
1048
1049 kfree(mdc800->download_urb_buffer);
1050 kfree(mdc800->write_urb_buffer);
1051 kfree(mdc800->irq_urb_buffer);
1052
1053 usb_free_urb(mdc800->write_urb);
1054 usb_free_urb(mdc800->download_urb);
1055 usb_free_urb(mdc800->irq_urb);
1056
1057 kfree (mdc800);
1058 }
1059 mdc800 = NULL;
1060 return retval;
1061}
1062
1063
1064static void __exit usb_mdc800_cleanup (void)
1065{
1066 usb_deregister (&mdc800_usb_driver);
1067
1068 usb_free_urb (mdc800->irq_urb);
1069 usb_free_urb (mdc800->download_urb);
1070 usb_free_urb (mdc800->write_urb);
1071
1072 kfree (mdc800->irq_urb_buffer);
1073 kfree (mdc800->write_urb_buffer);
1074 kfree (mdc800->download_urb_buffer);
1075
1076 kfree (mdc800);
1077 mdc800 = NULL;
1078}
1079
1080module_init (usb_mdc800_init);
1081module_exit (usb_mdc800_cleanup);
1082
1083MODULE_AUTHOR( DRIVER_AUTHOR );
1084MODULE_DESCRIPTION( DRIVER_DESC );
1085MODULE_LICENSE("GPL");
1086