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21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/init.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/usb.h>
27#include <linux/mutex.h>
28#include <asm/uaccess.h>
29
30#ifdef CONFIG_USB_DEBUG
31static int debug = 5;
32#else
33static int debug = 1;
34#endif
35
36
37#undef dbg
38#define dbg(lvl, format, arg...) \
39do { \
40 if (debug >= lvl) \
41 printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg); \
42} while (0)
43
44
45
46#define DRIVER_VERSION "v0.0.13"
47#define DRIVER_AUTHOR "John Homppi"
48#define DRIVER_DESC "adutux (see www.ontrak.net)"
49
50
51module_param(debug, int, S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug, "Debug enabled or not");
53
54
55#define ADU_VENDOR_ID 0x0a07
56#define ADU_PRODUCT_ID 0x0064
57
58
59static struct usb_device_id device_table [] = {
60 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) },
61 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) },
62 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) },
63 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) },
64 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) },
65 { USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) },
66 { }
67};
68
69MODULE_DEVICE_TABLE(usb, device_table);
70
71#ifdef CONFIG_USB_DYNAMIC_MINORS
72#define ADU_MINOR_BASE 0
73#else
74#define ADU_MINOR_BASE 67
75#endif
76
77
78#define MAX_DEVICES 16
79
80#define COMMAND_TIMEOUT (2*HZ)
81
82
83
84
85
86
87
88
89
90
91
92
93struct adu_device {
94 struct mutex mtx;
95 struct usb_device* udev;
96 struct usb_interface* interface;
97 unsigned int minor;
98 char serial_number[8];
99
100 int open_count;
101
102 char* read_buffer_primary;
103 int read_buffer_length;
104 char* read_buffer_secondary;
105 int secondary_head;
106 int secondary_tail;
107 spinlock_t buflock;
108
109 wait_queue_head_t read_wait;
110 wait_queue_head_t write_wait;
111
112 char* interrupt_in_buffer;
113 struct usb_endpoint_descriptor* interrupt_in_endpoint;
114 struct urb* interrupt_in_urb;
115 int read_urb_finished;
116
117 char* interrupt_out_buffer;
118 struct usb_endpoint_descriptor* interrupt_out_endpoint;
119 struct urb* interrupt_out_urb;
120 int out_urb_finished;
121};
122
123static DEFINE_MUTEX(adutux_mutex);
124
125static struct usb_driver adu_driver;
126
127static void adu_debug_data(int level, const char *function, int size,
128 const unsigned char *data)
129{
130 int i;
131
132 if (debug < level)
133 return;
134
135 printk(KERN_DEBUG __FILE__": %s - length = %d, data = ",
136 function, size);
137 for (i = 0; i < size; ++i)
138 printk("%.2x ", data[i]);
139 printk("\n");
140}
141
142
143
144
145
146static void adu_abort_transfers(struct adu_device *dev)
147{
148 unsigned long flags;
149
150 dbg(2," %s : enter", __func__);
151
152 if (dev->udev == NULL) {
153 dbg(1," %s : udev is null", __func__);
154 goto exit;
155 }
156
157
158
159
160 spin_lock_irqsave(&dev->buflock, flags);
161 if (!dev->read_urb_finished) {
162 spin_unlock_irqrestore(&dev->buflock, flags);
163 usb_kill_urb(dev->interrupt_in_urb);
164 } else
165 spin_unlock_irqrestore(&dev->buflock, flags);
166
167 spin_lock_irqsave(&dev->buflock, flags);
168 if (!dev->out_urb_finished) {
169 spin_unlock_irqrestore(&dev->buflock, flags);
170 usb_kill_urb(dev->interrupt_out_urb);
171 } else
172 spin_unlock_irqrestore(&dev->buflock, flags);
173
174exit:
175 dbg(2," %s : leave", __func__);
176}
177
178static void adu_delete(struct adu_device *dev)
179{
180 dbg(2, "%s enter", __func__);
181
182
183 usb_free_urb(dev->interrupt_in_urb);
184 usb_free_urb(dev->interrupt_out_urb);
185 kfree(dev->read_buffer_primary);
186 kfree(dev->read_buffer_secondary);
187 kfree(dev->interrupt_in_buffer);
188 kfree(dev->interrupt_out_buffer);
189 kfree(dev);
190
191 dbg(2, "%s : leave", __func__);
192}
193
194static void adu_interrupt_in_callback(struct urb *urb)
195{
196 struct adu_device *dev = urb->context;
197 int status = urb->status;
198
199 dbg(4," %s : enter, status %d", __func__, status);
200 adu_debug_data(5, __func__, urb->actual_length,
201 urb->transfer_buffer);
202
203 spin_lock(&dev->buflock);
204
205 if (status != 0) {
206 if ((status != -ENOENT) && (status != -ECONNRESET) &&
207 (status != -ESHUTDOWN)) {
208 dbg(1," %s : nonzero status received: %d",
209 __func__, status);
210 }
211 goto exit;
212 }
213
214 if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
215 if (dev->read_buffer_length <
216 (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
217 (urb->actual_length)) {
218 memcpy (dev->read_buffer_primary +
219 dev->read_buffer_length,
220 dev->interrupt_in_buffer, urb->actual_length);
221
222 dev->read_buffer_length += urb->actual_length;
223 dbg(2," %s reading %d ", __func__,
224 urb->actual_length);
225 } else {
226 dbg(1," %s : read_buffer overflow", __func__);
227 }
228 }
229
230exit:
231 dev->read_urb_finished = 1;
232 spin_unlock(&dev->buflock);
233
234 wake_up_interruptible(&dev->read_wait);
235 adu_debug_data(5, __func__, urb->actual_length,
236 urb->transfer_buffer);
237 dbg(4," %s : leave, status %d", __func__, status);
238}
239
240static void adu_interrupt_out_callback(struct urb *urb)
241{
242 struct adu_device *dev = urb->context;
243 int status = urb->status;
244
245 dbg(4," %s : enter, status %d", __func__, status);
246 adu_debug_data(5,__func__, urb->actual_length, urb->transfer_buffer);
247
248 if (status != 0) {
249 if ((status != -ENOENT) &&
250 (status != -ECONNRESET)) {
251 dbg(1, " %s :nonzero status received: %d",
252 __func__, status);
253 }
254 goto exit;
255 }
256
257 spin_lock(&dev->buflock);
258 dev->out_urb_finished = 1;
259 wake_up(&dev->write_wait);
260 spin_unlock(&dev->buflock);
261exit:
262
263 adu_debug_data(5, __func__, urb->actual_length,
264 urb->transfer_buffer);
265 dbg(4," %s : leave, status %d", __func__, status);
266}
267
268static int adu_open(struct inode *inode, struct file *file)
269{
270 struct adu_device *dev = NULL;
271 struct usb_interface *interface;
272 int subminor;
273 int retval;
274
275 dbg(2,"%s : enter", __func__);
276
277 subminor = iminor(inode);
278
279 if ((retval = mutex_lock_interruptible(&adutux_mutex))) {
280 dbg(2, "%s : mutex lock failed", __func__);
281 goto exit_no_lock;
282 }
283
284 interface = usb_find_interface(&adu_driver, subminor);
285 if (!interface) {
286 printk(KERN_ERR "adutux: %s - error, can't find device for "
287 "minor %d\n", __func__, subminor);
288 retval = -ENODEV;
289 goto exit_no_device;
290 }
291
292 dev = usb_get_intfdata(interface);
293 if (!dev || !dev->udev) {
294 retval = -ENODEV;
295 goto exit_no_device;
296 }
297
298
299 if (dev->open_count) {
300 retval = -EBUSY;
301 goto exit_no_device;
302 }
303
304 ++dev->open_count;
305 dbg(2,"%s : open count %d", __func__, dev->open_count);
306
307
308 file->private_data = dev;
309
310
311 dev->read_buffer_length = 0;
312
313
314 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
315 usb_rcvintpipe(dev->udev,
316 dev->interrupt_in_endpoint->bEndpointAddress),
317 dev->interrupt_in_buffer,
318 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
319 adu_interrupt_in_callback, dev,
320 dev->interrupt_in_endpoint->bInterval);
321 dev->read_urb_finished = 0;
322 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
323 dev->read_urb_finished = 1;
324
325
326
327
328 dev->out_urb_finished = 1;
329
330 retval = 0;
331
332exit_no_device:
333 mutex_unlock(&adutux_mutex);
334exit_no_lock:
335 dbg(2,"%s : leave, return value %d ", __func__, retval);
336 return retval;
337}
338
339static void adu_release_internal(struct adu_device *dev)
340{
341 dbg(2," %s : enter", __func__);
342
343
344 --dev->open_count;
345 dbg(2," %s : open count %d", __func__, dev->open_count);
346 if (dev->open_count <= 0) {
347 adu_abort_transfers(dev);
348 dev->open_count = 0;
349 }
350
351 dbg(2," %s : leave", __func__);
352}
353
354static int adu_release(struct inode *inode, struct file *file)
355{
356 struct adu_device *dev;
357 int retval = 0;
358
359 dbg(2," %s : enter", __func__);
360
361 if (file == NULL) {
362 dbg(1," %s : file is NULL", __func__);
363 retval = -ENODEV;
364 goto exit;
365 }
366
367 dev = file->private_data;
368 if (dev == NULL) {
369 dbg(1," %s : object is NULL", __func__);
370 retval = -ENODEV;
371 goto exit;
372 }
373
374 mutex_lock(&adutux_mutex);
375
376 if (dev->open_count <= 0) {
377 dbg(1," %s : device not opened", __func__);
378 retval = -ENODEV;
379 goto unlock;
380 }
381
382 adu_release_internal(dev);
383 if (dev->udev == NULL) {
384
385 if (!dev->open_count)
386 adu_delete(dev);
387 }
388unlock:
389 mutex_unlock(&adutux_mutex);
390exit:
391 dbg(2," %s : leave, return value %d", __func__, retval);
392 return retval;
393}
394
395static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
396 loff_t *ppos)
397{
398 struct adu_device *dev;
399 size_t bytes_read = 0;
400 size_t bytes_to_read = count;
401 int i;
402 int retval = 0;
403 int timeout = 0;
404 int should_submit = 0;
405 unsigned long flags;
406 DECLARE_WAITQUEUE(wait, current);
407
408 dbg(2," %s : enter, count = %Zd, file=%p", __func__, count, file);
409
410 dev = file->private_data;
411 dbg(2," %s : dev=%p", __func__, dev);
412
413 if (mutex_lock_interruptible(&dev->mtx))
414 return -ERESTARTSYS;
415
416
417 if (dev->udev == NULL) {
418 retval = -ENODEV;
419 printk(KERN_ERR "adutux: No device or device unplugged %d\n",
420 retval);
421 goto exit;
422 }
423
424
425 if (count == 0) {
426 dbg(1," %s : read request of 0 bytes", __func__);
427 goto exit;
428 }
429
430 timeout = COMMAND_TIMEOUT;
431 dbg(2," %s : about to start looping", __func__);
432 while (bytes_to_read) {
433 int data_in_secondary = dev->secondary_tail - dev->secondary_head;
434 dbg(2," %s : while, data_in_secondary=%d, status=%d",
435 __func__, data_in_secondary,
436 dev->interrupt_in_urb->status);
437
438 if (data_in_secondary) {
439
440 int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
441 i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
442 if (i < 0) {
443 retval = -EFAULT;
444 goto exit;
445 }
446 dev->secondary_head += (amount - i);
447 bytes_read += (amount - i);
448 bytes_to_read -= (amount - i);
449 if (i) {
450 retval = bytes_read ? bytes_read : -EFAULT;
451 goto exit;
452 }
453 } else {
454
455 spin_lock_irqsave (&dev->buflock, flags);
456 if (dev->read_buffer_length) {
457
458 char *tmp;
459 dbg(2," %s : swap, read_buffer_length = %d",
460 __func__, dev->read_buffer_length);
461 tmp = dev->read_buffer_secondary;
462 dev->read_buffer_secondary = dev->read_buffer_primary;
463 dev->read_buffer_primary = tmp;
464 dev->secondary_head = 0;
465 dev->secondary_tail = dev->read_buffer_length;
466 dev->read_buffer_length = 0;
467 spin_unlock_irqrestore(&dev->buflock, flags);
468
469 should_submit = 1;
470 } else {
471
472 if (!dev->read_urb_finished) {
473
474 spin_unlock_irqrestore(&dev->buflock, flags);
475 dbg(2," %s : submitted already", __func__);
476 } else {
477
478 dbg(2," %s : initiate input", __func__);
479 dev->read_urb_finished = 0;
480 spin_unlock_irqrestore(&dev->buflock, flags);
481
482 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
483 usb_rcvintpipe(dev->udev,
484 dev->interrupt_in_endpoint->bEndpointAddress),
485 dev->interrupt_in_buffer,
486 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
487 adu_interrupt_in_callback,
488 dev,
489 dev->interrupt_in_endpoint->bInterval);
490 retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
491 if (retval) {
492 dev->read_urb_finished = 1;
493 if (retval == -ENOMEM) {
494 retval = bytes_read ? bytes_read : -ENOMEM;
495 }
496 dbg(2," %s : submit failed", __func__);
497 goto exit;
498 }
499 }
500
501
502 set_current_state(TASK_INTERRUPTIBLE);
503 add_wait_queue(&dev->read_wait, &wait);
504 spin_lock_irqsave(&dev->buflock, flags);
505 if (!dev->read_urb_finished) {
506 spin_unlock_irqrestore(&dev->buflock, flags);
507 timeout = schedule_timeout(COMMAND_TIMEOUT);
508 } else {
509 spin_unlock_irqrestore(&dev->buflock, flags);
510 set_current_state(TASK_RUNNING);
511 }
512 remove_wait_queue(&dev->read_wait, &wait);
513
514 if (timeout <= 0) {
515 dbg(2," %s : timeout", __func__);
516 retval = bytes_read ? bytes_read : -ETIMEDOUT;
517 goto exit;
518 }
519
520 if (signal_pending(current)) {
521 dbg(2," %s : signal pending", __func__);
522 retval = bytes_read ? bytes_read : -EINTR;
523 goto exit;
524 }
525 }
526 }
527 }
528
529 retval = bytes_read;
530
531 spin_lock_irqsave(&dev->buflock, flags);
532 if (should_submit && dev->read_urb_finished) {
533 dev->read_urb_finished = 0;
534 spin_unlock_irqrestore(&dev->buflock, flags);
535 usb_fill_int_urb(dev->interrupt_in_urb,dev->udev,
536 usb_rcvintpipe(dev->udev,
537 dev->interrupt_in_endpoint->bEndpointAddress),
538 dev->interrupt_in_buffer,
539 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
540 adu_interrupt_in_callback,
541 dev,
542 dev->interrupt_in_endpoint->bInterval);
543 if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
544 dev->read_urb_finished = 1;
545
546 } else {
547 spin_unlock_irqrestore(&dev->buflock, flags);
548 }
549
550exit:
551
552 mutex_unlock(&dev->mtx);
553
554 dbg(2," %s : leave, return value %d", __func__, retval);
555 return retval;
556}
557
558static ssize_t adu_write(struct file *file, const __user char *buffer,
559 size_t count, loff_t *ppos)
560{
561 DECLARE_WAITQUEUE(waita, current);
562 struct adu_device *dev;
563 size_t bytes_written = 0;
564 size_t bytes_to_write;
565 size_t buffer_size;
566 unsigned long flags;
567 int retval;
568
569 dbg(2," %s : enter, count = %Zd", __func__, count);
570
571 dev = file->private_data;
572
573 retval = mutex_lock_interruptible(&dev->mtx);
574 if (retval)
575 goto exit_nolock;
576
577
578 if (dev->udev == NULL) {
579 retval = -ENODEV;
580 printk(KERN_ERR "adutux: No device or device unplugged %d\n",
581 retval);
582 goto exit;
583 }
584
585
586 if (count == 0) {
587 dbg(1," %s : write request of 0 bytes", __func__);
588 goto exit;
589 }
590
591 while (count > 0) {
592 add_wait_queue(&dev->write_wait, &waita);
593 set_current_state(TASK_INTERRUPTIBLE);
594 spin_lock_irqsave(&dev->buflock, flags);
595 if (!dev->out_urb_finished) {
596 spin_unlock_irqrestore(&dev->buflock, flags);
597
598 mutex_unlock(&dev->mtx);
599 if (signal_pending(current)) {
600 dbg(1," %s : interrupted", __func__);
601 set_current_state(TASK_RUNNING);
602 retval = -EINTR;
603 goto exit_onqueue;
604 }
605 if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
606 dbg(1, "%s - command timed out.", __func__);
607 retval = -ETIMEDOUT;
608 goto exit_onqueue;
609 }
610 remove_wait_queue(&dev->write_wait, &waita);
611 retval = mutex_lock_interruptible(&dev->mtx);
612 if (retval) {
613 retval = bytes_written ? bytes_written : retval;
614 goto exit_nolock;
615 }
616
617 dbg(4," %s : in progress, count = %Zd", __func__, count);
618 } else {
619 spin_unlock_irqrestore(&dev->buflock, flags);
620 set_current_state(TASK_RUNNING);
621 remove_wait_queue(&dev->write_wait, &waita);
622 dbg(4," %s : sending, count = %Zd", __func__, count);
623
624
625 buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
626 bytes_to_write = count > buffer_size ? buffer_size : count;
627 dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
628 __func__, buffer_size, count, bytes_to_write);
629
630 if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
631 retval = -EFAULT;
632 goto exit;
633 }
634
635
636 usb_fill_int_urb(
637 dev->interrupt_out_urb,
638 dev->udev,
639 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
640 dev->interrupt_out_buffer,
641 bytes_to_write,
642 adu_interrupt_out_callback,
643 dev,
644 dev->interrupt_out_endpoint->bInterval);
645 dev->interrupt_out_urb->actual_length = bytes_to_write;
646 dev->out_urb_finished = 0;
647 retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
648 if (retval < 0) {
649 dev->out_urb_finished = 1;
650 dev_err(&dev->udev->dev, "Couldn't submit "
651 "interrupt_out_urb %d\n", retval);
652 goto exit;
653 }
654
655 buffer += bytes_to_write;
656 count -= bytes_to_write;
657
658 bytes_written += bytes_to_write;
659 }
660 }
661 mutex_unlock(&dev->mtx);
662 return bytes_written;
663
664exit:
665 mutex_unlock(&dev->mtx);
666exit_nolock:
667 dbg(2," %s : leave, return value %d", __func__, retval);
668 return retval;
669
670exit_onqueue:
671 remove_wait_queue(&dev->write_wait, &waita);
672 return retval;
673}
674
675
676static const struct file_operations adu_fops = {
677 .owner = THIS_MODULE,
678 .read = adu_read,
679 .write = adu_write,
680 .open = adu_open,
681 .release = adu_release,
682};
683
684
685
686
687
688static struct usb_class_driver adu_class = {
689 .name = "usb/adutux%d",
690 .fops = &adu_fops,
691 .minor_base = ADU_MINOR_BASE,
692};
693
694
695
696
697
698
699
700static int adu_probe(struct usb_interface *interface,
701 const struct usb_device_id *id)
702{
703 struct usb_device *udev = interface_to_usbdev(interface);
704 struct adu_device *dev = NULL;
705 struct usb_host_interface *iface_desc;
706 struct usb_endpoint_descriptor *endpoint;
707 int retval = -ENODEV;
708 int in_end_size;
709 int out_end_size;
710 int i;
711
712 dbg(2," %s : enter", __func__);
713
714 if (udev == NULL) {
715 dev_err(&interface->dev, "udev is NULL.\n");
716 goto exit;
717 }
718
719
720 dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
721 if (dev == NULL) {
722 dev_err(&interface->dev, "Out of memory\n");
723 retval = -ENOMEM;
724 goto exit;
725 }
726
727 mutex_init(&dev->mtx);
728 spin_lock_init(&dev->buflock);
729 dev->udev = udev;
730 init_waitqueue_head(&dev->read_wait);
731 init_waitqueue_head(&dev->write_wait);
732
733 iface_desc = &interface->altsetting[0];
734
735
736 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
737 endpoint = &iface_desc->endpoint[i].desc;
738
739 if (usb_endpoint_is_int_in(endpoint))
740 dev->interrupt_in_endpoint = endpoint;
741
742 if (usb_endpoint_is_int_out(endpoint))
743 dev->interrupt_out_endpoint = endpoint;
744 }
745 if (dev->interrupt_in_endpoint == NULL) {
746 dev_err(&interface->dev, "interrupt in endpoint not found\n");
747 goto error;
748 }
749 if (dev->interrupt_out_endpoint == NULL) {
750 dev_err(&interface->dev, "interrupt out endpoint not found\n");
751 goto error;
752 }
753
754 in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
755 out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
756
757 dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
758 if (!dev->read_buffer_primary) {
759 dev_err(&interface->dev, "Couldn't allocate read_buffer_primary\n");
760 retval = -ENOMEM;
761 goto error;
762 }
763
764
765 memset(dev->read_buffer_primary, 'a', in_end_size);
766 memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
767 memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
768 memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
769
770 dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
771 if (!dev->read_buffer_secondary) {
772 dev_err(&interface->dev, "Couldn't allocate read_buffer_secondary\n");
773 retval = -ENOMEM;
774 goto error;
775 }
776
777
778 memset(dev->read_buffer_secondary, 'e', in_end_size);
779 memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
780 memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
781 memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
782
783 dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
784 if (!dev->interrupt_in_buffer) {
785 dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
786 goto error;
787 }
788
789
790 memset(dev->interrupt_in_buffer, 'i', in_end_size);
791
792 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
793 if (!dev->interrupt_in_urb) {
794 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
795 goto error;
796 }
797 dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
798 if (!dev->interrupt_out_buffer) {
799 dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
800 goto error;
801 }
802 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
803 if (!dev->interrupt_out_urb) {
804 dev_err(&interface->dev, "Couldn't allocate interrupt_out_urb\n");
805 goto error;
806 }
807
808 if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
809 sizeof(dev->serial_number))) {
810 dev_err(&interface->dev, "Could not retrieve serial number\n");
811 goto error;
812 }
813 dbg(2," %s : serial_number=%s", __func__, dev->serial_number);
814
815
816 usb_set_intfdata(interface, dev);
817
818 retval = usb_register_dev(interface, &adu_class);
819
820 if (retval) {
821
822 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
823 usb_set_intfdata(interface, NULL);
824 goto error;
825 }
826
827 dev->minor = interface->minor;
828
829
830 dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
831 udev->descriptor.idProduct, dev->serial_number,
832 (dev->minor - ADU_MINOR_BASE));
833exit:
834 dbg(2," %s : leave, return value %p (dev)", __func__, dev);
835
836 return retval;
837
838error:
839 adu_delete(dev);
840 return retval;
841}
842
843
844
845
846
847
848static void adu_disconnect(struct usb_interface *interface)
849{
850 struct adu_device *dev;
851 int minor;
852
853 dbg(2," %s : enter", __func__);
854
855 dev = usb_get_intfdata(interface);
856
857 mutex_lock(&dev->mtx);
858 dev->udev = NULL;
859 minor = dev->minor;
860 usb_deregister_dev(interface, &adu_class);
861 mutex_unlock(&dev->mtx);
862
863 mutex_lock(&adutux_mutex);
864 usb_set_intfdata(interface, NULL);
865
866
867 dbg(2," %s : open count %d", __func__, dev->open_count);
868 if (!dev->open_count)
869 adu_delete(dev);
870
871 mutex_unlock(&adutux_mutex);
872
873 dev_info(&interface->dev, "ADU device adutux%d now disconnected\n",
874 (minor - ADU_MINOR_BASE));
875
876 dbg(2," %s : leave", __func__);
877}
878
879
880static struct usb_driver adu_driver = {
881 .name = "adutux",
882 .probe = adu_probe,
883 .disconnect = adu_disconnect,
884 .id_table = device_table,
885};
886
887static int __init adu_init(void)
888{
889 int result;
890
891 dbg(2," %s : enter", __func__);
892
893
894 result = usb_register(&adu_driver);
895 if (result < 0) {
896 printk(KERN_ERR "usb_register failed for the "__FILE__
897 " driver. Error number %d\n", result);
898 goto exit;
899 }
900
901 printk(KERN_INFO "adutux " DRIVER_DESC " " DRIVER_VERSION "\n");
902 printk(KERN_INFO "adutux is an experimental driver. "
903 "Use at your own risk\n");
904
905exit:
906 dbg(2," %s : leave, return value %d", __func__, result);
907
908 return result;
909}
910
911static void __exit adu_exit(void)
912{
913 dbg(2," %s : enter", __func__);
914
915 usb_deregister(&adu_driver);
916 dbg(2," %s : leave", __func__);
917}
918
919module_init(adu_init);
920module_exit(adu_exit);
921
922MODULE_AUTHOR(DRIVER_AUTHOR);
923MODULE_DESCRIPTION(DRIVER_DESC);
924MODULE_LICENSE("GPL");
925