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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, umode_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 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
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 dev_err(&dev->udev->dev,
401 "LEGO USB Tower reset control request failed\n");
402 retval = result;
403 goto unlock_exit;
404 }
405
406
407 dev->read_buffer_length = 0;
408 dev->read_packet_length = 0;
409 usb_fill_int_urb (dev->interrupt_in_urb,
410 dev->udev,
411 usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress),
412 dev->interrupt_in_buffer,
413 usb_endpoint_maxp(dev->interrupt_in_endpoint),
414 tower_interrupt_in_callback,
415 dev,
416 dev->interrupt_in_interval);
417
418 dev->interrupt_in_running = 1;
419 dev->interrupt_in_done = 0;
420 mb();
421
422 retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL);
423 if (retval) {
424 dev_err(&dev->udev->dev,
425 "Couldn't submit interrupt_in_urb %d\n", retval);
426 dev->interrupt_in_running = 0;
427 dev->open_count = 0;
428 goto unlock_exit;
429 }
430
431
432 file->private_data = dev;
433
434unlock_exit:
435 mutex_unlock(&dev->lock);
436
437exit:
438 dbg(2, "%s: leave, return value %d ", __func__, retval);
439
440 return retval;
441}
442
443
444
445
446static int tower_release (struct inode *inode, struct file *file)
447{
448 struct lego_usb_tower *dev;
449 int retval = 0;
450
451 dbg(2, "%s: enter", __func__);
452
453 dev = file->private_data;
454
455 if (dev == NULL) {
456 dbg(1, "%s: object is NULL", __func__);
457 retval = -ENODEV;
458 goto exit_nolock;
459 }
460
461 mutex_lock(&open_disc_mutex);
462 if (mutex_lock_interruptible(&dev->lock)) {
463 retval = -ERESTARTSYS;
464 goto exit;
465 }
466
467 if (dev->open_count != 1) {
468 dbg(1, "%s: device not opened exactly once", __func__);
469 retval = -ENODEV;
470 goto unlock_exit;
471 }
472 if (dev->udev == NULL) {
473
474
475
476 mutex_unlock(&dev->lock);
477 tower_delete (dev);
478 goto exit;
479 }
480
481
482 if (dev->interrupt_out_busy) {
483 wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
484 }
485 tower_abort_transfers (dev);
486 dev->open_count = 0;
487
488unlock_exit:
489 mutex_unlock(&dev->lock);
490
491exit:
492 mutex_unlock(&open_disc_mutex);
493exit_nolock:
494 dbg(2, "%s: leave, return value %d", __func__, retval);
495 return retval;
496}
497
498
499
500
501
502
503static void tower_abort_transfers (struct lego_usb_tower *dev)
504{
505 dbg(2, "%s: enter", __func__);
506
507 if (dev == NULL) {
508 dbg(1, "%s: dev is null", __func__);
509 goto exit;
510 }
511
512
513 if (dev->interrupt_in_running) {
514 dev->interrupt_in_running = 0;
515 mb();
516 if (dev->udev)
517 usb_kill_urb (dev->interrupt_in_urb);
518 }
519 if (dev->interrupt_out_busy && dev->udev)
520 usb_kill_urb(dev->interrupt_out_urb);
521
522exit:
523 dbg(2, "%s: leave", __func__);
524}
525
526
527
528
529
530
531
532
533
534
535static void tower_check_for_read_packet (struct lego_usb_tower *dev)
536{
537 spin_lock_irq (&dev->read_buffer_lock);
538 if (!packet_timeout
539 || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies)
540 || dev->read_buffer_length == read_buffer_size) {
541 dev->read_packet_length = dev->read_buffer_length;
542 }
543 dev->interrupt_in_done = 0;
544 spin_unlock_irq (&dev->read_buffer_lock);
545}
546
547
548
549
550
551static unsigned int tower_poll (struct file *file, poll_table *wait)
552{
553 struct lego_usb_tower *dev;
554 unsigned int mask = 0;
555
556 dbg(2, "%s: enter", __func__);
557
558 dev = file->private_data;
559
560 if (!dev->udev)
561 return POLLERR | POLLHUP;
562
563 poll_wait(file, &dev->read_wait, wait);
564 poll_wait(file, &dev->write_wait, wait);
565
566 tower_check_for_read_packet(dev);
567 if (dev->read_packet_length > 0) {
568 mask |= POLLIN | POLLRDNORM;
569 }
570 if (!dev->interrupt_out_busy) {
571 mask |= POLLOUT | POLLWRNORM;
572 }
573
574 dbg(2, "%s: leave, mask = %d", __func__, mask);
575
576 return mask;
577}
578
579
580
581
582
583static loff_t tower_llseek (struct file *file, loff_t off, int whence)
584{
585 return -ESPIPE;
586}
587
588
589
590
591
592static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos)
593{
594 struct lego_usb_tower *dev;
595 size_t bytes_to_read;
596 int i;
597 int retval = 0;
598 unsigned long timeout = 0;
599
600 dbg(2, "%s: enter, count = %Zd", __func__, count);
601
602 dev = file->private_data;
603
604
605 if (mutex_lock_interruptible(&dev->lock)) {
606 retval = -ERESTARTSYS;
607 goto exit;
608 }
609
610
611 if (dev->udev == NULL) {
612 retval = -ENODEV;
613 printk(KERN_ERR "legousbtower: No device or device unplugged %d\n", retval);
614 goto unlock_exit;
615 }
616
617
618 if (count == 0) {
619 dbg(1, "%s: read request of 0 bytes", __func__);
620 goto unlock_exit;
621 }
622
623 if (read_timeout) {
624 timeout = jiffies + read_timeout * HZ / 1000;
625 }
626
627
628 tower_check_for_read_packet (dev);
629 while (dev->read_packet_length == 0) {
630 if (file->f_flags & O_NONBLOCK) {
631 retval = -EAGAIN;
632 goto unlock_exit;
633 }
634 retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies);
635 if (retval < 0) {
636 goto unlock_exit;
637 }
638
639
640 if (read_timeout
641 && (dev->read_buffer_length || dev->interrupt_out_busy)) {
642 timeout = jiffies + read_timeout * HZ / 1000;
643 }
644
645 if (read_timeout && time_after (jiffies, timeout)) {
646 retval = -ETIMEDOUT;
647 goto unlock_exit;
648 }
649 tower_check_for_read_packet (dev);
650 }
651
652
653 bytes_to_read = min(count, dev->read_packet_length);
654
655 if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) {
656 retval = -EFAULT;
657 goto unlock_exit;
658 }
659
660 spin_lock_irq (&dev->read_buffer_lock);
661 dev->read_buffer_length -= bytes_to_read;
662 dev->read_packet_length -= bytes_to_read;
663 for (i=0; i<dev->read_buffer_length; i++) {
664 dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read];
665 }
666 spin_unlock_irq (&dev->read_buffer_lock);
667
668 retval = bytes_to_read;
669
670unlock_exit:
671
672 mutex_unlock(&dev->lock);
673
674exit:
675 dbg(2, "%s: leave, return value %d", __func__, retval);
676 return retval;
677}
678
679
680
681
682
683static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
684{
685 struct lego_usb_tower *dev;
686 size_t bytes_to_write;
687 int retval = 0;
688
689 dbg(2, "%s: enter, count = %Zd", __func__, count);
690
691 dev = file->private_data;
692
693
694 if (mutex_lock_interruptible(&dev->lock)) {
695 retval = -ERESTARTSYS;
696 goto exit;
697 }
698
699
700 if (dev->udev == NULL) {
701 retval = -ENODEV;
702 printk(KERN_ERR "legousbtower: No device or device unplugged %d\n", retval);
703 goto unlock_exit;
704 }
705
706
707 if (count == 0) {
708 dbg(1, "%s: write request of 0 bytes", __func__);
709 goto unlock_exit;
710 }
711
712
713 while (dev->interrupt_out_busy) {
714 if (file->f_flags & O_NONBLOCK) {
715 retval = -EAGAIN;
716 goto unlock_exit;
717 }
718 retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy);
719 if (retval) {
720 goto unlock_exit;
721 }
722 }
723
724
725 bytes_to_write = min_t(int, count, write_buffer_size);
726 dbg(4, "%s: count = %Zd, bytes_to_write = %Zd", __func__, count, bytes_to_write);
727
728 if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) {
729 retval = -EFAULT;
730 goto unlock_exit;
731 }
732
733
734 usb_fill_int_urb(dev->interrupt_out_urb,
735 dev->udev,
736 usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
737 dev->interrupt_out_buffer,
738 bytes_to_write,
739 tower_interrupt_out_callback,
740 dev,
741 dev->interrupt_out_interval);
742
743 dev->interrupt_out_busy = 1;
744 wmb();
745
746 retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL);
747 if (retval) {
748 dev->interrupt_out_busy = 0;
749 dev_err(&dev->udev->dev,
750 "Couldn't submit interrupt_out_urb %d\n", retval);
751 goto unlock_exit;
752 }
753 retval = bytes_to_write;
754
755unlock_exit:
756
757 mutex_unlock(&dev->lock);
758
759exit:
760 dbg(2, "%s: leave, return value %d", __func__, retval);
761
762 return retval;
763}
764
765
766
767
768
769static void tower_interrupt_in_callback (struct urb *urb)
770{
771 struct lego_usb_tower *dev = urb->context;
772 int status = urb->status;
773 int retval;
774
775 dbg(4, "%s: enter, status %d", __func__, status);
776
777 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
778
779 if (status) {
780 if (status == -ENOENT ||
781 status == -ECONNRESET ||
782 status == -ESHUTDOWN) {
783 goto exit;
784 } else {
785 dbg(1, "%s: nonzero status received: %d", __func__, status);
786 goto resubmit;
787 }
788 }
789
790 if (urb->actual_length > 0) {
791 spin_lock (&dev->read_buffer_lock);
792 if (dev->read_buffer_length + urb->actual_length < read_buffer_size) {
793 memcpy (dev->read_buffer + dev->read_buffer_length,
794 dev->interrupt_in_buffer,
795 urb->actual_length);
796 dev->read_buffer_length += urb->actual_length;
797 dev->read_last_arrival = jiffies;
798 dbg(3, "%s: received %d bytes", __func__, urb->actual_length);
799 } else {
800 printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __func__, urb->actual_length);
801 }
802 spin_unlock (&dev->read_buffer_lock);
803 }
804
805resubmit:
806
807 if (dev->interrupt_in_running && dev->udev) {
808 retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC);
809 if (retval)
810 dev_err(&dev->udev->dev,
811 "%s: usb_submit_urb failed (%d)\n",
812 __func__, retval);
813 }
814
815exit:
816 dev->interrupt_in_done = 1;
817 wake_up_interruptible (&dev->read_wait);
818
819 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
820 dbg(4, "%s: leave, status %d", __func__, status);
821}
822
823
824
825
826
827static void tower_interrupt_out_callback (struct urb *urb)
828{
829 struct lego_usb_tower *dev = urb->context;
830 int status = urb->status;
831
832 dbg(4, "%s: enter, status %d", __func__, status);
833 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
834
835
836 if (status && !(status == -ENOENT ||
837 status == -ECONNRESET ||
838 status == -ESHUTDOWN)) {
839 dbg(1, "%s - nonzero write bulk status received: %d",
840 __func__, status);
841 }
842
843 dev->interrupt_out_busy = 0;
844 wake_up_interruptible(&dev->write_wait);
845
846 lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer);
847 dbg(4, "%s: leave, status %d", __func__, status);
848}
849
850
851
852
853
854
855
856
857static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id)
858{
859 struct device *idev = &interface->dev;
860 struct usb_device *udev = interface_to_usbdev(interface);
861 struct lego_usb_tower *dev = NULL;
862 struct usb_host_interface *iface_desc;
863 struct usb_endpoint_descriptor* endpoint;
864 struct tower_get_version_reply get_version_reply;
865 int i;
866 int retval = -ENOMEM;
867 int result;
868
869 dbg(2, "%s: enter", __func__);
870
871
872
873 dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL);
874
875 if (dev == NULL) {
876 dev_err(idev, "Out of memory\n");
877 goto exit;
878 }
879
880 mutex_init(&dev->lock);
881
882 dev->udev = udev;
883 dev->open_count = 0;
884
885 dev->read_buffer = NULL;
886 dev->read_buffer_length = 0;
887 dev->read_packet_length = 0;
888 spin_lock_init (&dev->read_buffer_lock);
889 dev->packet_timeout_jiffies = packet_timeout * HZ / 1000;
890 dev->read_last_arrival = jiffies;
891
892 init_waitqueue_head (&dev->read_wait);
893 init_waitqueue_head (&dev->write_wait);
894
895 dev->interrupt_in_buffer = NULL;
896 dev->interrupt_in_endpoint = NULL;
897 dev->interrupt_in_urb = NULL;
898 dev->interrupt_in_running = 0;
899 dev->interrupt_in_done = 0;
900
901 dev->interrupt_out_buffer = NULL;
902 dev->interrupt_out_endpoint = NULL;
903 dev->interrupt_out_urb = NULL;
904 dev->interrupt_out_busy = 0;
905
906 iface_desc = interface->cur_altsetting;
907
908
909 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
910 endpoint = &iface_desc->endpoint[i].desc;
911
912 if (usb_endpoint_xfer_int(endpoint)) {
913 if (usb_endpoint_dir_in(endpoint))
914 dev->interrupt_in_endpoint = endpoint;
915 else
916 dev->interrupt_out_endpoint = endpoint;
917 }
918 }
919 if(dev->interrupt_in_endpoint == NULL) {
920 dev_err(idev, "interrupt in endpoint not found\n");
921 goto error;
922 }
923 if (dev->interrupt_out_endpoint == NULL) {
924 dev_err(idev, "interrupt out endpoint not found\n");
925 goto error;
926 }
927
928 dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL);
929 if (!dev->read_buffer) {
930 dev_err(idev, "Couldn't allocate read_buffer\n");
931 goto error;
932 }
933 dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL);
934 if (!dev->interrupt_in_buffer) {
935 dev_err(idev, "Couldn't allocate interrupt_in_buffer\n");
936 goto error;
937 }
938 dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
939 if (!dev->interrupt_in_urb) {
940 dev_err(idev, "Couldn't allocate interrupt_in_urb\n");
941 goto error;
942 }
943 dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL);
944 if (!dev->interrupt_out_buffer) {
945 dev_err(idev, "Couldn't allocate interrupt_out_buffer\n");
946 goto error;
947 }
948 dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
949 if (!dev->interrupt_out_urb) {
950 dev_err(idev, "Couldn't allocate interrupt_out_urb\n");
951 goto error;
952 }
953 dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
954 dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
955
956
957 usb_set_intfdata (interface, dev);
958
959 retval = usb_register_dev (interface, &tower_class);
960
961 if (retval) {
962
963 dev_err(idev, "Not able to get a minor for this device.\n");
964 usb_set_intfdata (interface, NULL);
965 goto error;
966 }
967 dev->minor = interface->minor;
968
969
970 dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major "
971 "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE),
972 USB_MAJOR, dev->minor);
973
974
975 result = usb_control_msg (udev,
976 usb_rcvctrlpipe(udev, 0),
977 LEGO_USB_TOWER_REQUEST_GET_VERSION,
978 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
979 0,
980 0,
981 &get_version_reply,
982 sizeof(get_version_reply),
983 1000);
984 if (result < 0) {
985 dev_err(idev, "LEGO USB Tower get version control request failed\n");
986 retval = result;
987 goto error;
988 }
989 dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d "
990 "build %d\n", get_version_reply.major,
991 get_version_reply.minor,
992 le16_to_cpu(get_version_reply.build_no));
993
994
995exit:
996 dbg(2, "%s: leave, return value 0x%.8lx (dev)", __func__, (long) dev);
997
998 return retval;
999
1000error:
1001 tower_delete(dev);
1002 return retval;
1003}
1004
1005
1006
1007
1008
1009
1010
1011static void tower_disconnect (struct usb_interface *interface)
1012{
1013 struct lego_usb_tower *dev;
1014 int minor;
1015
1016 dbg(2, "%s: enter", __func__);
1017
1018 dev = usb_get_intfdata (interface);
1019 mutex_lock(&open_disc_mutex);
1020 usb_set_intfdata (interface, NULL);
1021
1022 minor = dev->minor;
1023
1024
1025 usb_deregister_dev (interface, &tower_class);
1026
1027 mutex_lock(&dev->lock);
1028 mutex_unlock(&open_disc_mutex);
1029
1030
1031 if (!dev->open_count) {
1032 mutex_unlock(&dev->lock);
1033 tower_delete (dev);
1034 } else {
1035 dev->udev = NULL;
1036
1037 wake_up_interruptible_all(&dev->read_wait);
1038 wake_up_interruptible_all(&dev->write_wait);
1039 mutex_unlock(&dev->lock);
1040 }
1041
1042 dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n",
1043 (minor - LEGO_USB_TOWER_MINOR_BASE));
1044
1045 dbg(2, "%s: leave", __func__);
1046}
1047
1048module_usb_driver(tower_driver);
1049
1050MODULE_AUTHOR(DRIVER_AUTHOR);
1051MODULE_DESCRIPTION(DRIVER_DESC);
1052#ifdef MODULE_LICENSE
1053MODULE_LICENSE("GPL");
1054#endif
1055