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78#include <linux/kernel.h>
79#include <linux/errno.h>
80#include <linux/init.h>
81#include <linux/slab.h>
82#include <linux/module.h>
83#include <linux/completion.h>
84#include <linux/mutex.h>
85#include <asm/uaccess.h>
86#include <linux/usb.h>
87#include <linux/poll.h>
88
89
90#ifdef CONFIG_USB_DEBUG
91 static int debug = 4;
92#else
93 static int debug = 0;
94#endif
95
96
97#undef dbg
98#define dbg(lvl, format, arg...) \
99do { \
100 if (debug >= lvl) \
101 printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \
102} while (0)
103
104
105#define DRIVER_VERSION "v0.96"
106#define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>"
107#define DRIVER_DESC "LEGO USB Tower Driver"
108
109
110module_param(debug, int, S_IRUGO | S_IWUSR);
111MODULE_PARM_DESC(debug, "Debug enabled or not");
112
113
114
115
116
117
118
119
120static int read_buffer_size = 480;
121module_param(read_buffer_size, int, 0);
122MODULE_PARM_DESC(read_buffer_size, "Read buffer size");
123
124
125
126
127
128
129
130static int write_buffer_size = 480;
131module_param(write_buffer_size, int, 0);
132MODULE_PARM_DESC(write_buffer_size, "Write buffer size");
133
134
135
136
137
138
139
140
141
142
143
144static int packet_timeout = 50;
145module_param(packet_timeout, int, 0);
146MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms");
147
148
149
150
151
152static int read_timeout = 200;
153module_param(read_timeout, int, 0);
154MODULE_PARM_DESC(read_timeout, "Read timeout in ms");
155
156
157
158
159
160
161
162
163
164
165static int interrupt_in_interval = 2;
166module_param(interrupt_in_interval, int, 0);
167MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms");
168
169static int interrupt_out_interval = 8;
170module_param(interrupt_out_interval, int, 0);
171MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms");
172
173
174#define LEGO_USB_TOWER_VENDOR_ID 0x0694
175#define LEGO_USB_TOWER_PRODUCT_ID 0x0001
176
177
178#define LEGO_USB_TOWER_REQUEST_RESET 0x04
179#define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD
180
181struct tower_reset_reply {
182 __le16 size;
183 __u8 err_code;
184 __u8 spare;
185} __attribute__ ((packed));
186
187struct tower_get_version_reply {
188 __le16 size;
189 __u8 err_code;
190 __u8 spare;
191 __u8 major;
192 __u8 minor;
193 __le16 build_no;
194} __attribute__ ((packed));
195
196
197
198static const struct usb_device_id tower_table[] = {
199 { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) },
200 { }
201};
202
203MODULE_DEVICE_TABLE (usb, tower_table);
204static DEFINE_MUTEX(open_disc_mutex);
205
206#define LEGO_USB_TOWER_MINOR_BASE 160
207
208
209
210struct lego_usb_tower {
211 struct mutex lock;
212 struct usb_device* udev;
213 unsigned char minor;
214
215 int open_count;
216
217 char* read_buffer;
218 size_t read_buffer_length;
219 size_t read_packet_length;
220 spinlock_t read_buffer_lock;
221 int packet_timeout_jiffies;
222 unsigned long read_last_arrival;
223
224 wait_queue_head_t read_wait;
225 wait_queue_head_t write_wait;
226
227 char* interrupt_in_buffer;
228 struct usb_endpoint_descriptor* interrupt_in_endpoint;
229 struct urb* interrupt_in_urb;
230 int interrupt_in_interval;
231 int interrupt_in_running;
232 int interrupt_in_done;
233
234 char* interrupt_out_buffer;
235 struct usb_endpoint_descriptor* interrupt_out_endpoint;
236 struct urb* interrupt_out_urb;
237 int interrupt_out_interval;
238 int interrupt_out_busy;
239
240};
241
242
243
244static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos);
245static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos);
246static inline void tower_delete (struct lego_usb_tower *dev);
247static int tower_open (struct inode *inode, struct file *file);
248static int tower_release (struct inode *inode, struct file *file);
249static unsigned int tower_poll (struct file *file, poll_table *wait);
250static loff_t tower_llseek (struct file *file, loff_t off, int whence);
251
252static void tower_abort_transfers (struct lego_usb_tower *dev);
253static void tower_check_for_read_packet (struct lego_usb_tower *dev);
254static void tower_interrupt_in_callback (struct urb *urb);
255static void tower_interrupt_out_callback (struct urb *urb);
256
257static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id);
258static void tower_disconnect (struct usb_interface *interface);
259
260
261
262static const struct file_operations tower_fops = {
263 .owner = THIS_MODULE,
264 .read = tower_read,
265 .write = tower_write,
266 .open = tower_open,
267 .release = tower_release,
268 .poll = tower_poll,
269 .llseek = tower_llseek,
270};
271
272static char *legousbtower_devnode(struct device *dev, mode_t *mode)
273{
274 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
275}
276
277
278
279
280
281static struct usb_class_driver tower_class = {
282 .name = "legousbtower%d",
283 .devnode = legousbtower_devnode,
284 .fops = &tower_fops,
285 .minor_base = LEGO_USB_TOWER_MINOR_BASE,
286};
287
288
289
290static struct usb_driver tower_driver = {
291 .name = "legousbtower",
292 .probe = tower_probe,
293 .disconnect = tower_disconnect,
294 .id_table = tower_table,
295};
296
297
298
299
300
301static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data)
302{
303 int i;
304
305 if (debug < level)
306 return;
307
308 printk (KERN_DEBUG "%s: %s - length = %d, data = ", __FILE__, function, size);
309 for (i = 0; i < size; ++i) {
310 printk ("%.2x ", data[i]);
311 }
312 printk ("\n");
313}
314
315
316
317
318
319static inline void tower_delete (struct lego_usb_tower *dev)
320{
321 dbg(2, "%s: enter", __func__);
322
323 tower_abort_transfers (dev);
324
325
326 usb_free_urb(dev->interrupt_in_urb);
327 usb_free_urb(dev->interrupt_out_urb);
328 kfree (dev->read_buffer);
329 kfree (dev->interrupt_in_buffer);
330 kfree (dev->interrupt_out_buffer);
331 kfree (dev);
332
333 dbg(2, "%s: leave", __func__);
334}
335
336
337
338
339
340static int tower_open (struct inode *inode, struct file *file)
341{
342 struct lego_usb_tower *dev = NULL;
343 int subminor;
344 int retval = 0;
345 struct usb_interface *interface;
346 struct tower_reset_reply reset_reply;
347 int result;
348
349 dbg(2, "%s: enter", __func__);
350
351 nonseekable_open(inode, file);
352 subminor = iminor(inode);
353
354 interface = usb_find_interface (&tower_driver, subminor);
355
356 if (!interface) {
357 err ("%s - error, can't find device for minor %d",
358 __func__, subminor);
359 retval = -ENODEV;
360 goto exit;
361 }
362
363 mutex_lock(&open_disc_mutex);
364 dev = usb_get_intfdata(interface);
365
366 if (!dev) {
367 mutex_unlock(&open_disc_mutex);
368 retval = -ENODEV;
369 goto exit;
370 }
371
372
373 if (mutex_lock_interruptible(&dev->lock)) {
374 mutex_unlock(&open_disc_mutex);
375 retval = -ERESTARTSYS;
376 goto exit;
377 }
378
379
380
381 if (dev->open_count) {
382 mutex_unlock(&open_disc_mutex);
383 retval = -EBUSY;
384 goto unlock_exit;
385 }
386 dev->open_count = 1;
387 mutex_unlock(&open_disc_mutex);
388
389
390 result = usb_control_msg (dev->udev,
391 usb_rcvctrlpipe(dev->udev, 0),
392 LEGO_USB_TOWER_REQUEST_RESET,
393 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
394 0,
395 0,
396 &reset_reply,
397 sizeof(reset_reply),
398 1000);
399 if (result < 0) {
400 err("LEGO USB Tower reset control request failed");
401 retval = result;
402 goto unlock_exit;
403 }
404
405
406 dev->read_buffer_length = 0;
407 dev->read_packet_length = 0;
408 usb_fill_int_urb (dev->interrupt_in_urb,
409 dev->udev,
410 usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress),
411 dev->interrupt_in_buffer,
412 le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
413 tower_interrupt_in_callback,
414 dev,
415 dev->interrupt_in_interval);
416
417 dev->interrupt_in_running = 1;
418 dev->interrupt_in_done = 0;
419 mb();
420
421 retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL);
422 if (retval) {
423 err("Couldn't submit interrupt_in_urb %d", retval);
424 dev->interrupt_in_running = 0;
425 dev->open_count = 0;
426 goto unlock_exit;
427 }
428
429
430 file->private_data = dev;
431
432unlock_exit:
433 mutex_unlock(&dev->lock);
434
435exit:
436 dbg(2, "%s: leave, return value %d ", __func__, retval);
437
438 return retval;
439}
440
441
442
443
444static int tower_release (struct inode *inode, struct file *file)
445{
446 struct lego_usb_tower *dev;
447 int retval = 0;
448
449 dbg(2, "%s: enter", __func__);
450
451 dev = file->private_data;
452
453 if (dev == NULL) {
454 dbg(1, "%s: object is NULL", __func__);
455 retval = -ENODEV;
456 goto exit_nolock;
457 }
458
459 mutex_lock(&open_disc_mutex);
460 if (mutex_lock_interruptible(&dev->lock)) {
461 retval = -ERESTARTSYS;
462 goto exit;
463 }
464
465 if (dev->open_count != 1) {
466 dbg(1, "%s: device not opened exactly once", __func__);
467 retval = -ENODEV;
468 goto unlock_exit;
469 }
470 if (dev->udev == NULL) {
471
472
473
474 mutex_unlock(&dev->lock);
475 tower_delete (dev);
476 goto exit;
477 }
478
479
480 if (dev->interrupt_out_busy) {
481 wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
482 }
483 tower_abort_transfers (dev);
484 dev->open_count = 0;
485
486unlock_exit:
487 mutex_unlock(&dev->lock);
488
489exit:
490 mutex_unlock(&open_disc_mutex);
491exit_nolock:
492 dbg(2, "%s: leave, return value %d", __func__, retval);
493 return retval;
494}
495
496
497
498
499
500
501static void tower_abort_transfers (struct lego_usb_tower *dev)
502{
503 dbg(2, "%s: enter", __func__);
504
505 if (dev == NULL) {
506 dbg(1, "%s: dev is null", __func__);
507 goto exit;
508 }
509
510
511 if (dev->interrupt_in_running) {
512 dev->interrupt_in_running = 0;
513 mb();
514 if (dev->udev)
515 usb_kill_urb (dev->interrupt_in_urb);
516 }
517 if (dev->interrupt_out_busy && dev->udev)
518 usb_kill_urb(dev->interrupt_out_urb);
519
520exit:
521 dbg(2, "%s: leave", __func__);
522}
523
524
525
526
527
528
529
530
531
532
533static void tower_check_for_read_packet (struct lego_usb_tower *dev)
534{
535 spin_lock_irq (&dev->read_buffer_lock);
536 if (!packet_timeout
537 || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies)
538 || dev->read_buffer_length == read_buffer_size) {
539 dev->read_packet_length = dev->read_buffer_length;
540 }
541 dev->interrupt_in_done = 0;
542 spin_unlock_irq (&dev->read_buffer_lock);
543}
544
545
546
547
548
549static unsigned int tower_poll (struct file *file, poll_table *wait)
550{
551 struct lego_usb_tower *dev;
552 unsigned int mask = 0;
553
554 dbg(2, "%s: enter", __func__);
555
556 dev = file->private_data;
557
558 if (!dev->udev)
559 return POLLERR | POLLHUP;
560
561 poll_wait(file, &dev->read_wait, wait);
562 poll_wait(file, &dev->write_wait, wait);
563
564 tower_check_for_read_packet(dev);
565 if (dev->read_packet_length > 0) {
566 mask |= POLLIN | POLLRDNORM;
567 }
568 if (!dev->interrupt_out_busy) {
569 mask |= POLLOUT | POLLWRNORM;
570 }
571
572 dbg(2, "%s: leave, mask = %d", __func__, mask);
573
574 return mask;
575}
576
577
578
579
580
581static loff_t tower_llseek (struct file *file, loff_t off, int whence)
582{
583 return -ESPIPE;
584}
585
586
587
588
589
590static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
591{
592 struct lego_usb_tower *dev;
593 size_t bytes_to_read;
594 int i;
595 int retval = 0;
596 unsigned long timeout = 0;
597
598 dbg(2, "%s: enter, count = %Zd", __func__, count);
599
600 dev = file->private_data;
601
602
603 if (mutex_lock_interruptible(&dev->lock)) {
604 retval = -ERESTARTSYS;
605 goto exit;
606 }
607
608
609 if (dev->udev == NULL) {
610 retval = -ENODEV;
611 err("No device or device unplugged %d", retval);
612 goto unlock_exit;
613 }
614
615
616 if (count == 0) {
617 dbg(1, "%s: read request of 0 bytes", __func__);
618 goto unlock_exit;
619 }
620
621 if (read_timeout) {
622 timeout = jiffies + read_timeout * HZ / 1000;
623 }
624
625
626 tower_check_for_read_packet (dev);
627 while (dev->read_packet_length == 0) {
628 if (file->f_flags & O_NONBLOCK) {
629 retval = -EAGAIN;
630 goto unlock_exit;
631 }
632 retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies);
633 if (retval < 0) {
634 goto unlock_exit;
635 }
636
637
638 if (read_timeout
639 && (dev->read_buffer_length || dev->interrupt_out_busy)) {
640 timeout = jiffies + read_timeout * HZ / 1000;
641 }
642
643 if (read_timeout && time_after (jiffies, timeout)) {
644 retval = -ETIMEDOUT;
645 goto unlock_exit;
646 }
647 tower_check_for_read_packet (dev);
648 }
649
650
651 bytes_to_read = min(count, dev->read_packet_length);
652
653 if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) {
654 retval = -EFAULT;
655 goto unlock_exit;
656 }
657
658 spin_lock_irq (&dev->read_buffer_lock);
659 dev->read_buffer_length -= bytes_to_read;
660 dev->read_packet_length -= bytes_to_read;
661 for (i=0; i<dev->read_buffer_length; i++) {
662 dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read];
663 }
664 spin_unlock_irq (&dev->read_buffer_lock);
665
666 retval = bytes_to_read;
667
668unlock_exit:
669
670 mutex_unlock(&dev->lock);
671
672exit:
673 dbg(2, "%s: leave, return value %d", __func__, retval);
674 return retval;
675}
676
677
678
679
680
681static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
682{
683 struct lego_usb_tower *dev;
684 size_t bytes_to_write;
685 int retval = 0;
686
687 dbg(2, "%s: enter, count = %Zd", __func__, count);
688
689 dev = file->private_data;
690
691
692 if (mutex_lock_interruptible(&dev->lock)) {
693 retval = -ERESTARTSYS;
694 goto exit;
695 }
696
697
698 if (dev->udev == NULL) {
699 retval = -ENODEV;
700 err("No device or device unplugged %d", retval);
701 goto unlock_exit;
702 }
703
704
705 if (count == 0) {
706 dbg(1, "%s: write request of 0 bytes", __func__);
707 goto unlock_exit;
708 }
709
710
711 while (dev->interrupt_out_busy) {
712 if (file->f_flags & O_NONBLOCK) {
713 retval = -EAGAIN;
714 goto unlock_exit;
715 }
716 retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy);
717 if (retval) {
718 goto unlock_exit;
719 }
720 }
721
722
723 bytes_to_write = min_t(int, count, write_buffer_size);
724 dbg(4, "%s: count = %Zd, bytes_to_write = %Zd", __func__, count, bytes_to_write);
725
726 if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) {
727 retval = -EFAULT;
728 goto unlock_exit;
729 }
730
731
732 usb_fill_int_urb(dev->interrupt_out_urb,
733 dev->udev,
734 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
735 dev->interrupt_out_buffer,
736 bytes_to_write,
737 tower_interrupt_out_callback,
738 dev,
739 dev->interrupt_out_interval);
740
741 dev->interrupt_out_busy = 1;
742 wmb();
743
744 retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL);
745 if (retval) {
746 dev->interrupt_out_busy = 0;
747 err("Couldn't submit interrupt_out_urb %d", retval);
748 goto unlock_exit;
749 }
750 retval = bytes_to_write;
751
752unlock_exit:
753
754 mutex_unlock(&dev->lock);
755
756exit:
757 dbg(2, "%s: leave, return value %d", __func__, retval);
758
759 return retval;
760}
761
762
763
764
765
766static void tower_interrupt_in_callback (struct urb *urb)
767{
768 struct lego_usb_tower *dev = urb->context;
769 int status = urb->status;
770 int retval;
771
772 dbg(4, "%s: enter, status %d", __func__, status);
773
774 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
775
776 if (status) {
777 if (status == -ENOENT ||
778 status == -ECONNRESET ||
779 status == -ESHUTDOWN) {
780 goto exit;
781 } else {
782 dbg(1, "%s: nonzero status received: %d", __func__, status);
783 goto resubmit;
784 }
785 }
786
787 if (urb->actual_length > 0) {
788 spin_lock (&dev->read_buffer_lock);
789 if (dev->read_buffer_length + urb->actual_length < read_buffer_size) {
790 memcpy (dev->read_buffer + dev->read_buffer_length,
791 dev->interrupt_in_buffer,
792 urb->actual_length);
793 dev->read_buffer_length += urb->actual_length;
794 dev->read_last_arrival = jiffies;
795 dbg(3, "%s: received %d bytes", __func__, urb->actual_length);
796 } else {
797 printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __func__, urb->actual_length);
798 }
799 spin_unlock (&dev->read_buffer_lock);
800 }
801
802resubmit:
803
804 if (dev->interrupt_in_running && dev->udev) {
805 retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC);
806 if (retval) {
807 err("%s: usb_submit_urb failed (%d)", __func__, retval);
808 }
809 }
810
811exit:
812 dev->interrupt_in_done = 1;
813 wake_up_interruptible (&dev->read_wait);
814
815 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
816 dbg(4, "%s: leave, status %d", __func__, status);
817}
818
819
820
821
822
823static void tower_interrupt_out_callback (struct urb *urb)
824{
825 struct lego_usb_tower *dev = urb->context;
826 int status = urb->status;
827
828 dbg(4, "%s: enter, status %d", __func__, status);
829 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
830
831
832 if (status && !(status == -ENOENT ||
833 status == -ECONNRESET ||
834 status == -ESHUTDOWN)) {
835 dbg(1, "%s - nonzero write bulk status received: %d",
836 __func__, status);
837 }
838
839 dev->interrupt_out_busy = 0;
840 wake_up_interruptible(&dev->write_wait);
841
842 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
843 dbg(4, "%s: leave, status %d", __func__, status);
844}
845
846
847
848
849
850
851
852
853static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id)
854{
855 struct usb_device *udev = interface_to_usbdev(interface);
856 struct lego_usb_tower *dev = NULL;
857 struct usb_host_interface *iface_desc;
858 struct usb_endpoint_descriptor* endpoint;
859 struct tower_get_version_reply get_version_reply;
860 int i;
861 int retval = -ENOMEM;
862 int result;
863
864 dbg(2, "%s: enter", __func__);
865
866 if (udev == NULL)
867 dev_info(&interface->dev, "udev is NULL.\n");
868
869
870
871 dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL);
872
873 if (dev == NULL) {
874 err ("Out of memory");
875 goto exit;
876 }
877
878 mutex_init(&dev->lock);
879
880 dev->udev = udev;
881 dev->open_count = 0;
882
883 dev->read_buffer = NULL;
884 dev->read_buffer_length = 0;
885 dev->read_packet_length = 0;
886 spin_lock_init (&dev->read_buffer_lock);
887 dev->packet_timeout_jiffies = packet_timeout * HZ / 1000;
888 dev->read_last_arrival = jiffies;
889
890 init_waitqueue_head (&dev->read_wait);
891 init_waitqueue_head (&dev->write_wait);
892
893 dev->interrupt_in_buffer = NULL;
894 dev->interrupt_in_endpoint = NULL;
895 dev->interrupt_in_urb = NULL;
896 dev->interrupt_in_running = 0;
897 dev->interrupt_in_done = 0;
898
899 dev->interrupt_out_buffer = NULL;
900 dev->interrupt_out_endpoint = NULL;
901 dev->interrupt_out_urb = NULL;
902 dev->interrupt_out_busy = 0;
903
904 iface_desc = interface->cur_altsetting;
905
906
907 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
908 endpoint = &iface_desc->endpoint[i].desc;
909
910 if (usb_endpoint_xfer_int(endpoint)) {
911 if (usb_endpoint_dir_in(endpoint))
912 dev->interrupt_in_endpoint = endpoint;
913 else
914 dev->interrupt_out_endpoint = endpoint;
915 }
916 }
917 if(dev->interrupt_in_endpoint == NULL) {
918 err("interrupt in endpoint not found");
919 goto error;
920 }
921 if (dev->interrupt_out_endpoint == NULL) {
922 err("interrupt out endpoint not found");
923 goto error;
924 }
925
926 dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL);
927 if (!dev->read_buffer) {
928 err("Couldn't allocate read_buffer");
929 goto error;
930 }
931 dev->interrupt_in_buffer = kmalloc (le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), GFP_KERNEL);
932 if (!dev->interrupt_in_buffer) {
933 err("Couldn't allocate interrupt_in_buffer");
934 goto error;
935 }
936 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
937 if (!dev->interrupt_in_urb) {
938 err("Couldn't allocate interrupt_in_urb");
939 goto error;
940 }
941 dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL);
942 if (!dev->interrupt_out_buffer) {
943 err("Couldn't allocate interrupt_out_buffer");
944 goto error;
945 }
946 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
947 if (!dev->interrupt_out_urb) {
948 err("Couldn't allocate interrupt_out_urb");
949 goto error;
950 }
951 dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
952 dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
953
954
955 usb_set_intfdata (interface, dev);
956
957 retval = usb_register_dev (interface, &tower_class);
958
959 if (retval) {
960
961 err ("Not able to get a minor for this device.");
962 usb_set_intfdata (interface, NULL);
963 goto error;
964 }
965 dev->minor = interface->minor;
966
967
968 dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major "
969 "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE),
970 USB_MAJOR, dev->minor);
971
972
973 result = usb_control_msg (udev,
974 usb_rcvctrlpipe(udev, 0),
975 LEGO_USB_TOWER_REQUEST_GET_VERSION,
976 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
977 0,
978 0,
979 &get_version_reply,
980 sizeof(get_version_reply),
981 1000);
982 if (result < 0) {
983 err("LEGO USB Tower get version control request failed");
984 retval = result;
985 goto error;
986 }
987 dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d "
988 "build %d\n", get_version_reply.major,
989 get_version_reply.minor,
990 le16_to_cpu(get_version_reply.build_no));
991
992
993exit:
994 dbg(2, "%s: leave, return value 0x%.8lx (dev)", __func__, (long) dev);
995
996 return retval;
997
998error:
999 tower_delete(dev);
1000 return retval;
1001}
1002
1003
1004
1005
1006
1007
1008
1009static void tower_disconnect (struct usb_interface *interface)
1010{
1011 struct lego_usb_tower *dev;
1012 int minor;
1013
1014 dbg(2, "%s: enter", __func__);
1015
1016 dev = usb_get_intfdata (interface);
1017 mutex_lock(&open_disc_mutex);
1018 usb_set_intfdata (interface, NULL);
1019
1020 minor = dev->minor;
1021
1022
1023 usb_deregister_dev (interface, &tower_class);
1024
1025 mutex_lock(&dev->lock);
1026 mutex_unlock(&open_disc_mutex);
1027
1028
1029 if (!dev->open_count) {
1030 mutex_unlock(&dev->lock);
1031 tower_delete (dev);
1032 } else {
1033 dev->udev = NULL;
1034
1035 wake_up_interruptible_all(&dev->read_wait);
1036 wake_up_interruptible_all(&dev->write_wait);
1037 mutex_unlock(&dev->lock);
1038 }
1039
1040 dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n",
1041 (minor - LEGO_USB_TOWER_MINOR_BASE));
1042
1043 dbg(2, "%s: leave", __func__);
1044}
1045
1046
1047
1048
1049
1050
1051static int __init lego_usb_tower_init(void)
1052{
1053 int result;
1054 int retval = 0;
1055
1056 dbg(2, "%s: enter", __func__);
1057
1058
1059 result = usb_register(&tower_driver);
1060 if (result < 0) {
1061 err("usb_register failed for the %s driver. Error number %d", __FILE__, result);
1062 retval = -1;
1063 goto exit;
1064 }
1065
1066 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1067 DRIVER_DESC "\n");
1068
1069exit:
1070 dbg(2, "%s: leave, return value %d", __func__, retval);
1071
1072 return retval;
1073}
1074
1075
1076
1077
1078
1079static void __exit lego_usb_tower_exit(void)
1080{
1081 dbg(2, "%s: enter", __func__);
1082
1083
1084 usb_deregister (&tower_driver);
1085
1086 dbg(2, "%s: leave", __func__);
1087}
1088
1089module_init (lego_usb_tower_init);
1090module_exit (lego_usb_tower_exit);
1091
1092MODULE_AUTHOR(DRIVER_AUTHOR);
1093MODULE_DESCRIPTION(DRIVER_DESC);
1094#ifdef MODULE_LICENSE
1095MODULE_LICENSE("GPL");
1096#endif
1097