1 // SPDX-License-Identifier: GPL-2.0+
3 * LEGO USB Tower driver
5 * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net>
6 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
8 * derived from USB Skeleton driver - 0.5
9 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
16 * - simplified buffering, one-shot URBs for writing
18 * - removed IOCTL (setting power/mode is more complicated, postponed)
20 * - added vendor commands for mode of operation and power level in open
22 * - set IR mode by default (by oversight 0.4 set VLL mode)
23 * 2002-01-11 - 0.5? pcchan
24 * - make read buffer reusable and work around bytes_to_write issue between
25 * uhci and legusbtower
26 * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au)
27 * - imported into lejos project
28 * - changed wake_up to wake_up_interruptible
29 * - changed to use lego0 rather than tower0
30 * - changed dbg() to use __func__ rather than deprecated __func__
31 * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au)
32 * - changed read and write to write everything or
33 * timeout (from a patch by Chris Riesen and Brett Thaeler driver)
34 * - added ioctl functionality to set timeouts
35 * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au)
36 * - initial import into LegoUSB project
37 * - merge of existing LegoUSB.c driver
38 * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au)
39 * - port to 2.6 style driver
40 * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net>
42 * - unlink read URBs which are no longer needed
43 * - allow increased buffer size, eliminates need for timeout on write
44 * - have read URB running continuously
47 * - added nonblocking I/O
48 * - changed back __func__ to __func__
49 * - read and log tower firmware version
50 * - reset tower on probe, avoids failure of first write
51 * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net>
52 * - timeout read now only after inactivity, shorten default accordingly
53 * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net>
54 * - log major, minor instead of possibly confusing device filename
55 * - whitespace cleanup
56 * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net>
57 * - normalize whitespace in debug messages
58 * - take care about endianness in control message responses
59 * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net>
60 * - make default intervals longer to accommodate current EHCI driver
61 * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net>
62 * - replaced atomic_t by memory barriers
63 * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net>
64 * - wait for completion of write urb in release (needed for remotecontrol)
65 * - corrected poll for write direction (missing negation)
66 * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net>
67 * - make device locking interruptible
68 * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net>
69 * - check for valid udev on resubmitting and unlinking urbs
70 * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net>
71 * - move reset into open to clean out spurious data
74 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
76 #include <linux/kernel.h>
77 #include <linux/errno.h>
78 #include <linux/slab.h>
79 #include <linux/module.h>
80 #include <linux/completion.h>
81 #include <linux/mutex.h>
82 #include <linux/uaccess.h>
83 #include <linux/usb.h>
84 #include <linux/poll.h>
87 #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>"
88 #define DRIVER_DESC "LEGO USB Tower Driver"
91 /* The defaults are chosen to work with the latest versions of leJOS and NQC.
94 /* Some legacy software likes to receive packets in one piece.
95 * In this case read_buffer_size should exceed the maximal packet length
96 * (417 for datalog uploads), and packet_timeout should be set.
98 static int read_buffer_size
= 480;
99 module_param(read_buffer_size
, int, 0);
100 MODULE_PARM_DESC(read_buffer_size
, "Read buffer size");
102 /* Some legacy software likes to send packets in one piece.
103 * In this case write_buffer_size should exceed the maximal packet length
104 * (417 for firmware and program downloads).
105 * A problem with long writes is that the following read may time out
106 * if the software is not prepared to wait long enough.
108 static int write_buffer_size
= 480;
109 module_param(write_buffer_size
, int, 0);
110 MODULE_PARM_DESC(write_buffer_size
, "Write buffer size");
112 /* Some legacy software expects reads to contain whole LASM packets.
113 * To achieve this, characters which arrive before a packet timeout
114 * occurs will be returned in a single read operation.
115 * A problem with long reads is that the software may time out
116 * if it is not prepared to wait long enough.
117 * The packet timeout should be greater than the time between the
118 * reception of subsequent characters, which should arrive about
119 * every 5ms for the standard 2400 baud.
120 * Set it to 0 to disable.
122 static int packet_timeout
= 50;
123 module_param(packet_timeout
, int, 0);
124 MODULE_PARM_DESC(packet_timeout
, "Packet timeout in ms");
126 /* Some legacy software expects blocking reads to time out.
127 * Timeout occurs after the specified time of read and write inactivity.
128 * Set it to 0 to disable.
130 static int read_timeout
= 200;
131 module_param(read_timeout
, int, 0);
132 MODULE_PARM_DESC(read_timeout
, "Read timeout in ms");
134 /* As of kernel version 2.6.4 ehci-hcd uses an
135 * "only one interrupt transfer per frame" shortcut
136 * to simplify the scheduling of periodic transfers.
137 * This conflicts with our standard 1ms intervals for in and out URBs.
138 * We use default intervals of 2ms for in and 8ms for out transfers,
139 * which is fast enough for 2400 baud and allows a small additional load.
140 * Increase the interval to allow more devices that do interrupt transfers,
141 * or set to 0 to use the standard interval from the endpoint descriptors.
143 static int interrupt_in_interval
= 2;
144 module_param(interrupt_in_interval
, int, 0);
145 MODULE_PARM_DESC(interrupt_in_interval
, "Interrupt in interval in ms");
147 static int interrupt_out_interval
= 8;
148 module_param(interrupt_out_interval
, int, 0);
149 MODULE_PARM_DESC(interrupt_out_interval
, "Interrupt out interval in ms");
151 /* Define these values to match your device */
152 #define LEGO_USB_TOWER_VENDOR_ID 0x0694
153 #define LEGO_USB_TOWER_PRODUCT_ID 0x0001
155 /* Vendor requests */
156 #define LEGO_USB_TOWER_REQUEST_RESET 0x04
157 #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD
159 struct tower_reset_reply
{
160 __le16 size
; /* little-endian */
163 } __attribute__ ((packed
));
165 struct tower_get_version_reply
{
166 __le16 size
; /* little-endian */
171 __le16 build_no
; /* little-endian */
172 } __attribute__ ((packed
));
175 /* table of devices that work with this driver */
176 static const struct usb_device_id tower_table
[] = {
177 { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID
, LEGO_USB_TOWER_PRODUCT_ID
) },
178 { } /* Terminating entry */
181 MODULE_DEVICE_TABLE (usb
, tower_table
);
183 #define LEGO_USB_TOWER_MINOR_BASE 160
186 /* Structure to hold all of our device specific stuff */
187 struct lego_usb_tower
{
188 struct mutex lock
; /* locks this structure */
189 struct usb_device
* udev
; /* save off the usb device pointer */
190 unsigned char minor
; /* the starting minor number for this device */
192 int open_count
; /* number of times this port has been opened */
193 unsigned long disconnected
:1;
196 size_t read_buffer_length
; /* this much came in */
197 size_t read_packet_length
; /* this much will be returned on read */
198 spinlock_t read_buffer_lock
;
199 int packet_timeout_jiffies
;
200 unsigned long read_last_arrival
;
202 wait_queue_head_t read_wait
;
203 wait_queue_head_t write_wait
;
205 char* interrupt_in_buffer
;
206 struct usb_endpoint_descriptor
* interrupt_in_endpoint
;
207 struct urb
* interrupt_in_urb
;
208 int interrupt_in_interval
;
209 int interrupt_in_running
;
210 int interrupt_in_done
;
212 char* interrupt_out_buffer
;
213 struct usb_endpoint_descriptor
* interrupt_out_endpoint
;
214 struct urb
* interrupt_out_urb
;
215 int interrupt_out_interval
;
216 int interrupt_out_busy
;
221 /* local function prototypes */
222 static ssize_t
tower_read (struct file
*file
, char __user
*buffer
, size_t count
, loff_t
*ppos
);
223 static ssize_t
tower_write (struct file
*file
, const char __user
*buffer
, size_t count
, loff_t
*ppos
);
224 static inline void tower_delete (struct lego_usb_tower
*dev
);
225 static int tower_open (struct inode
*inode
, struct file
*file
);
226 static int tower_release (struct inode
*inode
, struct file
*file
);
227 static unsigned int tower_poll (struct file
*file
, poll_table
*wait
);
228 static loff_t
tower_llseek (struct file
*file
, loff_t off
, int whence
);
230 static void tower_abort_transfers (struct lego_usb_tower
*dev
);
231 static void tower_check_for_read_packet (struct lego_usb_tower
*dev
);
232 static void tower_interrupt_in_callback (struct urb
*urb
);
233 static void tower_interrupt_out_callback (struct urb
*urb
);
235 static int tower_probe (struct usb_interface
*interface
, const struct usb_device_id
*id
);
236 static void tower_disconnect (struct usb_interface
*interface
);
239 /* file operations needed when we register this driver */
240 static const struct file_operations tower_fops
= {
241 .owner
= THIS_MODULE
,
243 .write
= tower_write
,
245 .release
= tower_release
,
247 .llseek
= tower_llseek
,
250 static char *legousbtower_devnode(struct device
*dev
, umode_t
*mode
)
252 return kasprintf(GFP_KERNEL
, "usb/%s", dev_name(dev
));
256 * usb class driver info in order to get a minor number from the usb core,
257 * and to have the device registered with the driver core
259 static struct usb_class_driver tower_class
= {
260 .name
= "legousbtower%d",
261 .devnode
= legousbtower_devnode
,
263 .minor_base
= LEGO_USB_TOWER_MINOR_BASE
,
267 /* usb specific object needed to register this driver with the usb subsystem */
268 static struct usb_driver tower_driver
= {
269 .name
= "legousbtower",
270 .probe
= tower_probe
,
271 .disconnect
= tower_disconnect
,
272 .id_table
= tower_table
,
277 * lego_usb_tower_debug_data
279 static inline void lego_usb_tower_debug_data(struct device
*dev
,
280 const char *function
, int size
,
281 const unsigned char *data
)
283 dev_dbg(dev
, "%s - length = %d, data = %*ph\n",
284 function
, size
, size
, data
);
291 static inline void tower_delete (struct lego_usb_tower
*dev
)
293 /* free data structures */
294 usb_free_urb(dev
->interrupt_in_urb
);
295 usb_free_urb(dev
->interrupt_out_urb
);
296 kfree (dev
->read_buffer
);
297 kfree (dev
->interrupt_in_buffer
);
298 kfree (dev
->interrupt_out_buffer
);
299 usb_put_dev(dev
->udev
);
307 static int tower_open (struct inode
*inode
, struct file
*file
)
309 struct lego_usb_tower
*dev
= NULL
;
312 struct usb_interface
*interface
;
313 struct tower_reset_reply
*reset_reply
;
316 reset_reply
= kmalloc(sizeof(*reset_reply
), GFP_KERNEL
);
323 nonseekable_open(inode
, file
);
324 subminor
= iminor(inode
);
326 interface
= usb_find_interface (&tower_driver
, subminor
);
329 pr_err("error, can't find device for minor %d\n", subminor
);
334 dev
= usb_get_intfdata(interface
);
340 /* lock this device */
341 if (mutex_lock_interruptible(&dev
->lock
)) {
342 retval
= -ERESTARTSYS
;
347 /* allow opening only once */
348 if (dev
->open_count
) {
353 /* reset the tower */
354 result
= usb_control_msg (dev
->udev
,
355 usb_rcvctrlpipe(dev
->udev
, 0),
356 LEGO_USB_TOWER_REQUEST_RESET
,
357 USB_TYPE_VENDOR
| USB_DIR_IN
| USB_RECIP_DEVICE
,
361 sizeof(*reset_reply
),
364 dev_err(&dev
->udev
->dev
,
365 "LEGO USB Tower reset control request failed\n");
370 /* initialize in direction */
371 dev
->read_buffer_length
= 0;
372 dev
->read_packet_length
= 0;
373 usb_fill_int_urb (dev
->interrupt_in_urb
,
375 usb_rcvintpipe(dev
->udev
, dev
->interrupt_in_endpoint
->bEndpointAddress
),
376 dev
->interrupt_in_buffer
,
377 usb_endpoint_maxp(dev
->interrupt_in_endpoint
),
378 tower_interrupt_in_callback
,
380 dev
->interrupt_in_interval
);
382 dev
->interrupt_in_running
= 1;
383 dev
->interrupt_in_done
= 0;
386 retval
= usb_submit_urb (dev
->interrupt_in_urb
, GFP_KERNEL
);
388 dev_err(&dev
->udev
->dev
,
389 "Couldn't submit interrupt_in_urb %d\n", retval
);
390 dev
->interrupt_in_running
= 0;
394 /* save device in the file's private structure */
395 file
->private_data
= dev
;
400 mutex_unlock(&dev
->lock
);
410 static int tower_release (struct inode
*inode
, struct file
*file
)
412 struct lego_usb_tower
*dev
;
415 dev
= file
->private_data
;
422 if (mutex_lock_interruptible(&dev
->lock
)) {
423 retval
= -ERESTARTSYS
;
427 if (dev
->open_count
!= 1) {
428 dev_dbg(&dev
->udev
->dev
, "%s: device not opened exactly once\n",
434 if (dev
->disconnected
) {
435 /* the device was unplugged before the file was released */
437 /* unlock here as tower_delete frees dev */
438 mutex_unlock(&dev
->lock
);
443 /* wait until write transfer is finished */
444 if (dev
->interrupt_out_busy
) {
445 wait_event_interruptible_timeout (dev
->write_wait
, !dev
->interrupt_out_busy
, 2 * HZ
);
447 tower_abort_transfers (dev
);
451 mutex_unlock(&dev
->lock
);
458 * tower_abort_transfers
459 * aborts transfers and frees associated data structures
461 static void tower_abort_transfers (struct lego_usb_tower
*dev
)
466 /* shutdown transfer */
467 if (dev
->interrupt_in_running
) {
468 dev
->interrupt_in_running
= 0;
470 usb_kill_urb(dev
->interrupt_in_urb
);
472 if (dev
->interrupt_out_busy
)
473 usb_kill_urb(dev
->interrupt_out_urb
);
478 * tower_check_for_read_packet
480 * To get correct semantics for signals and non-blocking I/O
481 * with packetizing we pretend not to see any data in the read buffer
482 * until it has been there unchanged for at least
483 * dev->packet_timeout_jiffies, or until the buffer is full.
485 static void tower_check_for_read_packet (struct lego_usb_tower
*dev
)
487 spin_lock_irq (&dev
->read_buffer_lock
);
489 || time_after(jiffies
, dev
->read_last_arrival
+ dev
->packet_timeout_jiffies
)
490 || dev
->read_buffer_length
== read_buffer_size
) {
491 dev
->read_packet_length
= dev
->read_buffer_length
;
493 dev
->interrupt_in_done
= 0;
494 spin_unlock_irq (&dev
->read_buffer_lock
);
501 static unsigned int tower_poll (struct file
*file
, poll_table
*wait
)
503 struct lego_usb_tower
*dev
;
504 unsigned int mask
= 0;
506 dev
= file
->private_data
;
508 if (dev
->disconnected
)
509 return POLLERR
| POLLHUP
;
511 poll_wait(file
, &dev
->read_wait
, wait
);
512 poll_wait(file
, &dev
->write_wait
, wait
);
514 tower_check_for_read_packet(dev
);
515 if (dev
->read_packet_length
> 0) {
516 mask
|= POLLIN
| POLLRDNORM
;
518 if (!dev
->interrupt_out_busy
) {
519 mask
|= POLLOUT
| POLLWRNORM
;
529 static loff_t
tower_llseek (struct file
*file
, loff_t off
, int whence
)
531 return -ESPIPE
; /* unseekable */
538 static ssize_t
tower_read (struct file
*file
, char __user
*buffer
, size_t count
, loff_t
*ppos
)
540 struct lego_usb_tower
*dev
;
541 size_t bytes_to_read
;
544 unsigned long timeout
= 0;
546 dev
= file
->private_data
;
548 /* lock this object */
549 if (mutex_lock_interruptible(&dev
->lock
)) {
550 retval
= -ERESTARTSYS
;
554 /* verify that the device wasn't unplugged */
555 if (dev
->disconnected
) {
557 pr_err("No device or device unplugged %d\n", retval
);
561 /* verify that we actually have some data to read */
563 dev_dbg(&dev
->udev
->dev
, "read request of 0 bytes\n");
568 timeout
= jiffies
+ msecs_to_jiffies(read_timeout
);
572 tower_check_for_read_packet (dev
);
573 while (dev
->read_packet_length
== 0) {
574 if (file
->f_flags
& O_NONBLOCK
) {
578 retval
= wait_event_interruptible_timeout(dev
->read_wait
, dev
->interrupt_in_done
, dev
->packet_timeout_jiffies
);
583 /* reset read timeout during read or write activity */
585 && (dev
->read_buffer_length
|| dev
->interrupt_out_busy
)) {
586 timeout
= jiffies
+ msecs_to_jiffies(read_timeout
);
588 /* check for read timeout */
589 if (read_timeout
&& time_after (jiffies
, timeout
)) {
593 tower_check_for_read_packet (dev
);
596 /* copy the data from read_buffer into userspace */
597 bytes_to_read
= min(count
, dev
->read_packet_length
);
599 if (copy_to_user (buffer
, dev
->read_buffer
, bytes_to_read
)) {
604 spin_lock_irq (&dev
->read_buffer_lock
);
605 dev
->read_buffer_length
-= bytes_to_read
;
606 dev
->read_packet_length
-= bytes_to_read
;
607 for (i
=0; i
<dev
->read_buffer_length
; i
++) {
608 dev
->read_buffer
[i
] = dev
->read_buffer
[i
+bytes_to_read
];
610 spin_unlock_irq (&dev
->read_buffer_lock
);
612 retval
= bytes_to_read
;
615 /* unlock the device */
616 mutex_unlock(&dev
->lock
);
626 static ssize_t
tower_write (struct file
*file
, const char __user
*buffer
, size_t count
, loff_t
*ppos
)
628 struct lego_usb_tower
*dev
;
629 size_t bytes_to_write
;
632 dev
= file
->private_data
;
634 /* lock this object */
635 if (mutex_lock_interruptible(&dev
->lock
)) {
636 retval
= -ERESTARTSYS
;
640 /* verify that the device wasn't unplugged */
641 if (dev
->disconnected
) {
643 pr_err("No device or device unplugged %d\n", retval
);
647 /* verify that we actually have some data to write */
649 dev_dbg(&dev
->udev
->dev
, "write request of 0 bytes\n");
653 /* wait until previous transfer is finished */
654 while (dev
->interrupt_out_busy
) {
655 if (file
->f_flags
& O_NONBLOCK
) {
659 retval
= wait_event_interruptible (dev
->write_wait
, !dev
->interrupt_out_busy
);
665 /* write the data into interrupt_out_buffer from userspace */
666 bytes_to_write
= min_t(int, count
, write_buffer_size
);
667 dev_dbg(&dev
->udev
->dev
, "%s: count = %zd, bytes_to_write = %zd\n",
668 __func__
, count
, bytes_to_write
);
670 if (copy_from_user (dev
->interrupt_out_buffer
, buffer
, bytes_to_write
)) {
675 /* send off the urb */
676 usb_fill_int_urb(dev
->interrupt_out_urb
,
678 usb_sndintpipe(dev
->udev
, dev
->interrupt_out_endpoint
->bEndpointAddress
),
679 dev
->interrupt_out_buffer
,
681 tower_interrupt_out_callback
,
683 dev
->interrupt_out_interval
);
685 dev
->interrupt_out_busy
= 1;
688 retval
= usb_submit_urb (dev
->interrupt_out_urb
, GFP_KERNEL
);
690 dev
->interrupt_out_busy
= 0;
691 dev_err(&dev
->udev
->dev
,
692 "Couldn't submit interrupt_out_urb %d\n", retval
);
695 retval
= bytes_to_write
;
698 /* unlock the device */
699 mutex_unlock(&dev
->lock
);
707 * tower_interrupt_in_callback
709 static void tower_interrupt_in_callback (struct urb
*urb
)
711 struct lego_usb_tower
*dev
= urb
->context
;
712 int status
= urb
->status
;
715 lego_usb_tower_debug_data(&dev
->udev
->dev
, __func__
,
716 urb
->actual_length
, urb
->transfer_buffer
);
719 if (status
== -ENOENT
||
720 status
== -ECONNRESET
||
721 status
== -ESHUTDOWN
) {
724 dev_dbg(&dev
->udev
->dev
,
725 "%s: nonzero status received: %d\n", __func__
,
727 goto resubmit
; /* maybe we can recover */
731 if (urb
->actual_length
> 0) {
732 spin_lock (&dev
->read_buffer_lock
);
733 if (dev
->read_buffer_length
+ urb
->actual_length
< read_buffer_size
) {
734 memcpy (dev
->read_buffer
+ dev
->read_buffer_length
,
735 dev
->interrupt_in_buffer
,
737 dev
->read_buffer_length
+= urb
->actual_length
;
738 dev
->read_last_arrival
= jiffies
;
739 dev_dbg(&dev
->udev
->dev
, "%s: received %d bytes\n",
740 __func__
, urb
->actual_length
);
742 pr_warn("read_buffer overflow, %d bytes dropped\n",
745 spin_unlock (&dev
->read_buffer_lock
);
749 /* resubmit if we're still running */
750 if (dev
->interrupt_in_running
) {
751 retval
= usb_submit_urb (dev
->interrupt_in_urb
, GFP_ATOMIC
);
753 dev_err(&dev
->udev
->dev
,
754 "%s: usb_submit_urb failed (%d)\n",
759 dev
->interrupt_in_done
= 1;
760 wake_up_interruptible (&dev
->read_wait
);
765 * tower_interrupt_out_callback
767 static void tower_interrupt_out_callback (struct urb
*urb
)
769 struct lego_usb_tower
*dev
= urb
->context
;
770 int status
= urb
->status
;
772 lego_usb_tower_debug_data(&dev
->udev
->dev
, __func__
,
773 urb
->actual_length
, urb
->transfer_buffer
);
775 /* sync/async unlink faults aren't errors */
776 if (status
&& !(status
== -ENOENT
||
777 status
== -ECONNRESET
||
778 status
== -ESHUTDOWN
)) {
779 dev_dbg(&dev
->udev
->dev
,
780 "%s: nonzero write bulk status received: %d\n", __func__
,
784 dev
->interrupt_out_busy
= 0;
785 wake_up_interruptible(&dev
->write_wait
);
792 * Called by the usb core when a new device is connected that it thinks
793 * this driver might be interested in.
795 static int tower_probe (struct usb_interface
*interface
, const struct usb_device_id
*id
)
797 struct device
*idev
= &interface
->dev
;
798 struct usb_device
*udev
= interface_to_usbdev(interface
);
799 struct lego_usb_tower
*dev
= NULL
;
800 struct tower_get_version_reply
*get_version_reply
= NULL
;
801 int retval
= -ENOMEM
;
804 /* allocate memory for our device state and initialize it */
806 dev
= kmalloc (sizeof(struct lego_usb_tower
), GFP_KERNEL
);
811 mutex_init(&dev
->lock
);
813 dev
->udev
= usb_get_dev(udev
);
815 dev
->disconnected
= 0;
817 dev
->read_buffer
= NULL
;
818 dev
->read_buffer_length
= 0;
819 dev
->read_packet_length
= 0;
820 spin_lock_init (&dev
->read_buffer_lock
);
821 dev
->packet_timeout_jiffies
= msecs_to_jiffies(packet_timeout
);
822 dev
->read_last_arrival
= jiffies
;
824 init_waitqueue_head (&dev
->read_wait
);
825 init_waitqueue_head (&dev
->write_wait
);
827 dev
->interrupt_in_buffer
= NULL
;
828 dev
->interrupt_in_endpoint
= NULL
;
829 dev
->interrupt_in_urb
= NULL
;
830 dev
->interrupt_in_running
= 0;
831 dev
->interrupt_in_done
= 0;
833 dev
->interrupt_out_buffer
= NULL
;
834 dev
->interrupt_out_endpoint
= NULL
;
835 dev
->interrupt_out_urb
= NULL
;
836 dev
->interrupt_out_busy
= 0;
838 result
= usb_find_common_endpoints_reverse(interface
->cur_altsetting
,
840 &dev
->interrupt_in_endpoint
,
841 &dev
->interrupt_out_endpoint
);
843 dev_err(idev
, "interrupt endpoints not found\n");
848 dev
->read_buffer
= kmalloc (read_buffer_size
, GFP_KERNEL
);
849 if (!dev
->read_buffer
)
851 dev
->interrupt_in_buffer
= kmalloc (usb_endpoint_maxp(dev
->interrupt_in_endpoint
), GFP_KERNEL
);
852 if (!dev
->interrupt_in_buffer
)
854 dev
->interrupt_in_urb
= usb_alloc_urb(0, GFP_KERNEL
);
855 if (!dev
->interrupt_in_urb
)
857 dev
->interrupt_out_buffer
= kmalloc (write_buffer_size
, GFP_KERNEL
);
858 if (!dev
->interrupt_out_buffer
)
860 dev
->interrupt_out_urb
= usb_alloc_urb(0, GFP_KERNEL
);
861 if (!dev
->interrupt_out_urb
)
863 dev
->interrupt_in_interval
= interrupt_in_interval
? interrupt_in_interval
: dev
->interrupt_in_endpoint
->bInterval
;
864 dev
->interrupt_out_interval
= interrupt_out_interval
? interrupt_out_interval
: dev
->interrupt_out_endpoint
->bInterval
;
866 get_version_reply
= kmalloc(sizeof(*get_version_reply
), GFP_KERNEL
);
868 if (!get_version_reply
) {
873 /* get the firmware version and log it */
874 result
= usb_control_msg (udev
,
875 usb_rcvctrlpipe(udev
, 0),
876 LEGO_USB_TOWER_REQUEST_GET_VERSION
,
877 USB_TYPE_VENDOR
| USB_DIR_IN
| USB_RECIP_DEVICE
,
881 sizeof(*get_version_reply
),
883 if (result
< sizeof(*get_version_reply
)) {
886 dev_err(idev
, "get version request failed: %d\n", result
);
890 dev_info(&interface
->dev
,
891 "LEGO USB Tower firmware version is %d.%d build %d\n",
892 get_version_reply
->major
,
893 get_version_reply
->minor
,
894 le16_to_cpu(get_version_reply
->build_no
));
896 /* we can register the device now, as it is ready */
897 usb_set_intfdata (interface
, dev
);
899 retval
= usb_register_dev (interface
, &tower_class
);
902 /* something prevented us from registering this driver */
903 dev_err(idev
, "Not able to get a minor for this device.\n");
906 dev
->minor
= interface
->minor
;
908 /* let the user know what node this device is now attached to */
909 dev_info(&interface
->dev
, "LEGO USB Tower #%d now attached to major "
910 "%d minor %d\n", (dev
->minor
- LEGO_USB_TOWER_MINOR_BASE
),
911 USB_MAJOR
, dev
->minor
);
914 kfree(get_version_reply
);
918 kfree(get_version_reply
);
927 * Called by the usb core when the device is removed from the system.
929 static void tower_disconnect (struct usb_interface
*interface
)
931 struct lego_usb_tower
*dev
;
934 dev
= usb_get_intfdata (interface
);
938 /* give back our minor and prevent further open() */
939 usb_deregister_dev (interface
, &tower_class
);
942 usb_poison_urb(dev
->interrupt_in_urb
);
943 usb_poison_urb(dev
->interrupt_out_urb
);
945 mutex_lock(&dev
->lock
);
947 /* if the device is not opened, then we clean up right now */
948 if (!dev
->open_count
) {
949 mutex_unlock(&dev
->lock
);
952 dev
->disconnected
= 1;
953 /* wake up pollers */
954 wake_up_interruptible_all(&dev
->read_wait
);
955 wake_up_interruptible_all(&dev
->write_wait
);
956 mutex_unlock(&dev
->lock
);
959 dev_info(&interface
->dev
, "LEGO USB Tower #%d now disconnected\n",
960 (minor
- LEGO_USB_TOWER_MINOR_BASE
));
963 module_usb_driver(tower_driver
);
965 MODULE_AUTHOR(DRIVER_AUTHOR
);
966 MODULE_DESCRIPTION(DRIVER_DESC
);
967 #ifdef MODULE_LICENSE
968 MODULE_LICENSE("GPL");