2 * lirc_sasem.c - USB remote support for LIRC
5 * Copyright (C) 2004-2005 Oliver Stabel <oliver.stabel@gmx.de>
6 * Tim Davies <tim@opensystems.net.au>
8 * This driver was derived from:
9 * Venky Raju <dev@venky.ws>
10 * "lirc_imon - "LIRC/VFD driver for Ahanix/Soundgraph IMON IR/VFD"
11 * Paul Miller <pmiller9@users.sourceforge.net>'s 2003-2004
12 * "lirc_atiusb - USB remote support for LIRC"
13 * Culver Consulting Services <henry@culcon.com>'s 2003
14 * "Sasem OnAir VFD/IR USB driver"
17 * NOTE - The LCDproc iMon driver should work with this module. More info at
18 * http://www.frogstorm.info/sasem
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 #include <linux/errno.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/slab.h>
43 #include <linux/uaccess.h>
44 #include <linux/usb.h>
46 #include <media/lirc.h>
47 #include <media/lirc_dev.h>
50 #define MOD_AUTHOR "Oliver Stabel <oliver.stabel@gmx.de>, " \
51 "Tim Davies <tim@opensystems.net.au>"
52 #define MOD_DESC "USB Driver for Sasem Remote Controller V1.1"
53 #define MOD_NAME "lirc_sasem"
54 #define MOD_VERSION "0.5"
56 #define VFD_MINOR_BASE 144 /* Same as LCD */
57 #define DEVICE_NAME "lcd%d"
59 #define BUF_CHUNK_SIZE 8
62 #define IOCTL_LCD_CONTRAST 1
64 /*** P R O T O T Y P E S ***/
66 /* USB Callback prototypes */
67 static int sasem_probe(struct usb_interface
*interface
,
68 const struct usb_device_id
*id
);
69 static void sasem_disconnect(struct usb_interface
*interface
);
70 static void usb_rx_callback(struct urb
*urb
);
71 static void usb_tx_callback(struct urb
*urb
);
73 /* VFD file_operations function prototypes */
74 static int vfd_open(struct inode
*inode
, struct file
*file
);
75 static long vfd_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
);
76 static int vfd_close(struct inode
*inode
, struct file
*file
);
77 static ssize_t
vfd_write(struct file
*file
, const char __user
*buf
,
78 size_t n_bytes
, loff_t
*pos
);
80 /* LIRC driver function prototypes */
81 static int ir_open(void *data
);
82 static void ir_close(void *data
);
84 /*** G L O B A L S ***/
85 #define SASEM_DATA_BUF_SZ 32
87 struct sasem_context
{
89 struct usb_device
*dev
;
90 int vfd_isopen
; /* VFD port has been opened */
91 unsigned int vfd_contrast
; /* VFD contrast */
92 int ir_isopen
; /* IR port has been opened */
93 int dev_present
; /* USB device presence */
94 struct mutex ctx_lock
; /* to lock this object */
95 wait_queue_head_t remove_ok
; /* For unexpected USB disconnects */
97 struct lirc_driver
*driver
;
98 struct usb_endpoint_descriptor
*rx_endpoint
;
99 struct usb_endpoint_descriptor
*tx_endpoint
;
102 unsigned char usb_rx_buf
[8];
103 unsigned char usb_tx_buf
[8];
106 unsigned char data_buf
[SASEM_DATA_BUF_SZ
]; /* user data
108 struct completion finished
; /* wait for write to finish */
109 atomic_t busy
; /* write in progress */
110 int status
; /* status of tx completion */
113 /* for dealing with repeat codes (wish there was a toggle bit!) */
114 struct timeval presstime
;
119 /* VFD file operations */
120 static const struct file_operations vfd_fops
= {
121 .owner
= THIS_MODULE
,
124 .unlocked_ioctl
= &vfd_ioctl
,
125 .release
= &vfd_close
,
126 .llseek
= noop_llseek
,
129 /* USB Device ID for Sasem USB Control Board */
130 static struct usb_device_id sasem_usb_id_table
[] = {
131 /* Sasem USB Control Board */
132 { USB_DEVICE(0x11ba, 0x0101) },
133 /* Terminating entry */
137 /* USB Device data */
138 static struct usb_driver sasem_driver
= {
140 .probe
= sasem_probe
,
141 .disconnect
= sasem_disconnect
,
142 .id_table
= sasem_usb_id_table
,
145 static struct usb_class_driver sasem_class
= {
148 .minor_base
= VFD_MINOR_BASE
,
151 /* to prevent races between open() and disconnect() */
152 static DEFINE_MUTEX(disconnect_lock
);
157 /*** M O D U L E C O D E ***/
159 MODULE_AUTHOR(MOD_AUTHOR
);
160 MODULE_DESCRIPTION(MOD_DESC
);
161 MODULE_LICENSE("GPL");
162 module_param(debug
, int, S_IRUGO
| S_IWUSR
);
163 MODULE_PARM_DESC(debug
, "Debug messages: 0=no, 1=yes (default: no)");
165 static void delete_context(struct sasem_context
*context
)
167 usb_free_urb(context
->tx_urb
); /* VFD */
168 usb_free_urb(context
->rx_urb
); /* IR */
169 lirc_buffer_free(context
->driver
->rbuf
);
170 kfree(context
->driver
->rbuf
);
171 kfree(context
->driver
);
175 static void deregister_from_lirc(struct sasem_context
*context
)
178 int minor
= context
->driver
->minor
;
180 retval
= lirc_unregister_driver(minor
);
182 dev_err(&context
->dev
->dev
,
183 "%s: unable to deregister from lirc (%d)\n",
186 dev_info(&context
->dev
->dev
,
187 "Deregistered Sasem driver (minor:%d)\n", minor
);
192 * Called when the VFD device (e.g. /dev/usb/lcd)
193 * is opened by the application.
195 static int vfd_open(struct inode
*inode
, struct file
*file
)
197 struct usb_interface
*interface
;
198 struct sasem_context
*context
= NULL
;
202 /* prevent races with disconnect */
203 mutex_lock(&disconnect_lock
);
205 subminor
= iminor(inode
);
206 interface
= usb_find_interface(&sasem_driver
, subminor
);
208 pr_err("%s: could not find interface for minor %d\n",
213 context
= usb_get_intfdata(interface
);
216 dev_err(&interface
->dev
, "no context found for minor %d\n",
222 mutex_lock(&context
->ctx_lock
);
224 if (context
->vfd_isopen
) {
225 dev_err(&interface
->dev
,
226 "%s: VFD port is already open", __func__
);
229 context
->vfd_isopen
= 1;
230 file
->private_data
= context
;
231 dev_info(&interface
->dev
, "VFD port opened\n");
234 mutex_unlock(&context
->ctx_lock
);
237 mutex_unlock(&disconnect_lock
);
242 * Called when the VFD device (e.g. /dev/usb/lcd)
243 * is closed by the application.
245 static long vfd_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
247 struct sasem_context
*context
= NULL
;
249 context
= (struct sasem_context
*) file
->private_data
;
252 pr_err("%s: no context for device\n", __func__
);
256 mutex_lock(&context
->ctx_lock
);
259 case IOCTL_LCD_CONTRAST
:
262 context
->vfd_contrast
= (unsigned int)arg
;
265 pr_info("Unknown IOCTL command\n");
266 mutex_unlock(&context
->ctx_lock
);
267 return -ENOIOCTLCMD
; /* not supported */
270 mutex_unlock(&context
->ctx_lock
);
275 * Called when the VFD device (e.g. /dev/usb/lcd)
276 * is closed by the application.
278 static int vfd_close(struct inode
*inode
, struct file
*file
)
280 struct sasem_context
*context
= NULL
;
283 context
= (struct sasem_context
*) file
->private_data
;
286 pr_err("%s: no context for device\n", __func__
);
290 mutex_lock(&context
->ctx_lock
);
292 if (!context
->vfd_isopen
) {
293 dev_err(&context
->dev
->dev
, "%s: VFD is not open\n", __func__
);
296 context
->vfd_isopen
= 0;
297 dev_info(&context
->dev
->dev
, "VFD port closed\n");
298 if (!context
->dev_present
&& !context
->ir_isopen
) {
300 /* Device disconnected before close and IR port is
301 * not open. If IR port is open, context will be
302 * deleted by ir_close. */
303 mutex_unlock(&context
->ctx_lock
);
304 delete_context(context
);
309 mutex_unlock(&context
->ctx_lock
);
314 * Sends a packet to the VFD.
316 static int send_packet(struct sasem_context
*context
)
322 pipe
= usb_sndintpipe(context
->dev
,
323 context
->tx_endpoint
->bEndpointAddress
);
324 interval
= context
->tx_endpoint
->bInterval
;
326 usb_fill_int_urb(context
->tx_urb
, context
->dev
, pipe
,
327 context
->usb_tx_buf
, sizeof(context
->usb_tx_buf
),
328 usb_tx_callback
, context
, interval
);
330 context
->tx_urb
->actual_length
= 0;
332 init_completion(&context
->tx
.finished
);
333 atomic_set(&context
->tx
.busy
, 1);
335 retval
= usb_submit_urb(context
->tx_urb
, GFP_KERNEL
);
337 atomic_set(&context
->tx
.busy
, 0);
338 dev_err(&context
->dev
->dev
, "error submitting urb (%d)\n",
341 /* Wait for transmission to complete (or abort) */
342 mutex_unlock(&context
->ctx_lock
);
343 wait_for_completion(&context
->tx
.finished
);
344 mutex_lock(&context
->ctx_lock
);
346 retval
= context
->tx
.status
;
348 dev_err(&context
->dev
->dev
,
349 "packet tx failed (%d)\n", retval
);
356 * Writes data to the VFD. The Sasem VFD is 2x16 characters
357 * and requires data in 9 consecutive USB interrupt packets,
358 * each packet carrying 8 bytes.
360 static ssize_t
vfd_write(struct file
*file
, const char __user
*buf
,
361 size_t n_bytes
, loff_t
*pos
)
365 struct sasem_context
*context
;
366 int *data_buf
= NULL
;
368 context
= (struct sasem_context
*) file
->private_data
;
370 pr_err("%s: no context for device\n", __func__
);
374 mutex_lock(&context
->ctx_lock
);
376 if (!context
->dev_present
) {
377 pr_err("%s: no Sasem device present\n", __func__
);
382 if (n_bytes
<= 0 || n_bytes
> SASEM_DATA_BUF_SZ
) {
383 dev_err(&context
->dev
->dev
, "%s: invalid payload size\n",
389 data_buf
= memdup_user(buf
, n_bytes
);
390 if (IS_ERR(data_buf
)) {
391 retval
= PTR_ERR(data_buf
);
396 memcpy(context
->tx
.data_buf
, data_buf
, n_bytes
);
398 /* Pad with spaces */
399 for (i
= n_bytes
; i
< SASEM_DATA_BUF_SZ
; ++i
)
400 context
->tx
.data_buf
[i
] = ' ';
402 /* Nine 8 byte packets to be sent */
403 /* NOTE: "\x07\x01\0\0\0\0\0\0" or "\x0c\0\0\0\0\0\0\0"
404 * will clear the VFD */
405 for (i
= 0; i
< 9; i
++) {
408 memcpy(context
->usb_tx_buf
, "\x07\0\0\0\0\0\0\0", 8);
409 context
->usb_tx_buf
[1] = (context
->vfd_contrast
) ?
410 (0x2B - (context
->vfd_contrast
- 1) / 250)
414 memcpy(context
->usb_tx_buf
, "\x09\x01\0\0\0\0\0\0", 8);
417 memcpy(context
->usb_tx_buf
, "\x0b\x01\0\0\0\0\0\0", 8);
420 memcpy(context
->usb_tx_buf
, context
->tx
.data_buf
, 8);
423 memcpy(context
->usb_tx_buf
,
424 context
->tx
.data_buf
+ 8, 8);
427 memcpy(context
->usb_tx_buf
, "\x09\x01\0\0\0\0\0\0", 8);
430 memcpy(context
->usb_tx_buf
, "\x0b\x02\0\0\0\0\0\0", 8);
433 memcpy(context
->usb_tx_buf
,
434 context
->tx
.data_buf
+ 16, 8);
437 memcpy(context
->usb_tx_buf
,
438 context
->tx
.data_buf
+ 24, 8);
441 retval
= send_packet(context
);
443 dev_err(&context
->dev
->dev
,
444 "send packet failed for packet #%d\n", i
);
450 mutex_unlock(&context
->ctx_lock
);
453 return (!retval
) ? n_bytes
: retval
;
457 * Callback function for USB core API: transmit data
459 static void usb_tx_callback(struct urb
*urb
)
461 struct sasem_context
*context
;
465 context
= (struct sasem_context
*) urb
->context
;
469 context
->tx
.status
= urb
->status
;
471 /* notify waiters that write has finished */
472 atomic_set(&context
->tx
.busy
, 0);
473 complete(&context
->tx
.finished
);
477 * Called by lirc_dev when the application opens /dev/lirc
479 static int ir_open(void *data
)
482 struct sasem_context
*context
;
484 /* prevent races with disconnect */
485 mutex_lock(&disconnect_lock
);
489 mutex_lock(&context
->ctx_lock
);
491 if (context
->ir_isopen
) {
492 dev_err(&context
->dev
->dev
, "%s: IR port is already open\n",
498 usb_fill_int_urb(context
->rx_urb
, context
->dev
,
499 usb_rcvintpipe(context
->dev
,
500 context
->rx_endpoint
->bEndpointAddress
),
501 context
->usb_rx_buf
, sizeof(context
->usb_rx_buf
),
502 usb_rx_callback
, context
, context
->rx_endpoint
->bInterval
);
504 retval
= usb_submit_urb(context
->rx_urb
, GFP_KERNEL
);
507 dev_err(&context
->dev
->dev
,
508 "usb_submit_urb failed for ir_open (%d)\n", retval
);
510 context
->ir_isopen
= 1;
511 dev_info(&context
->dev
->dev
, "IR port opened\n");
515 mutex_unlock(&context
->ctx_lock
);
517 mutex_unlock(&disconnect_lock
);
522 * Called by lirc_dev when the application closes /dev/lirc
524 static void ir_close(void *data
)
526 struct sasem_context
*context
;
530 pr_err("%s: no context for device\n", __func__
);
534 mutex_lock(&context
->ctx_lock
);
536 usb_kill_urb(context
->rx_urb
);
537 context
->ir_isopen
= 0;
538 pr_info("IR port closed\n");
540 if (!context
->dev_present
) {
543 * Device disconnected while IR port was
544 * still open. Driver was not deregistered
545 * at disconnect time, so do it now.
547 deregister_from_lirc(context
);
549 if (!context
->vfd_isopen
) {
551 mutex_unlock(&context
->ctx_lock
);
552 delete_context(context
);
555 /* If VFD port is open, context will be deleted by vfd_close */
558 mutex_unlock(&context
->ctx_lock
);
562 * Process the incoming packet
564 static void incoming_packet(struct sasem_context
*context
,
567 int len
= urb
->actual_length
;
568 unsigned char *buf
= urb
->transfer_buffer
;
573 dev_warn(&context
->dev
->dev
,
574 "%s: invalid incoming packet size (%d)\n",
580 dev_info(&context
->dev
->dev
, "Incoming data: %*ph\n", len
, buf
);
582 * Lirc could deal with the repeat code, but we really need to block it
583 * if it arrives too late. Otherwise we could repeat the wrong code.
586 /* get the time since the last button press */
587 do_gettimeofday(&tv
);
588 ms
= (tv
.tv_sec
- context
->presstime
.tv_sec
) * 1000 +
589 (tv
.tv_usec
- context
->presstime
.tv_usec
) / 1000;
591 if (memcmp(buf
, "\x08\0\0\0\0\0\0\0", 8) == 0) {
593 * the repeat code is being sent, so we copy
594 * the old code to LIRC
598 * NOTE: Only if the last code was less than 250ms ago
599 * - no one should be able to push another (undetected) button
600 * in that time and then get a false repeat of the previous
601 * press but it is long enough for a genuine repeat
603 if ((ms
< 250) && (context
->codesaved
!= 0)) {
604 memcpy(buf
, &context
->lastcode
, 8);
605 context
->presstime
.tv_sec
= tv
.tv_sec
;
606 context
->presstime
.tv_usec
= tv
.tv_usec
;
609 /* save the current valid code for repeats */
610 memcpy(&context
->lastcode
, buf
, 8);
612 * set flag to signal a valid code was save;
613 * just for safety reasons
615 context
->codesaved
= 1;
616 context
->presstime
.tv_sec
= tv
.tv_sec
;
617 context
->presstime
.tv_usec
= tv
.tv_usec
;
620 lirc_buffer_write(context
->driver
->rbuf
, buf
);
621 wake_up(&context
->driver
->rbuf
->wait_poll
);
625 * Callback function for USB core API: receive data
627 static void usb_rx_callback(struct urb
*urb
)
629 struct sasem_context
*context
;
633 context
= (struct sasem_context
*) urb
->context
;
637 switch (urb
->status
) {
639 case -ENOENT
: /* usbcore unlink successful! */
643 if (context
->ir_isopen
)
644 incoming_packet(context
, urb
);
648 dev_warn(&urb
->dev
->dev
, "%s: status (%d): ignored",
649 __func__
, urb
->status
);
653 usb_submit_urb(context
->rx_urb
, GFP_ATOMIC
);
659 * Callback function for USB core API: Probe
661 static int sasem_probe(struct usb_interface
*interface
,
662 const struct usb_device_id
*id
)
664 struct usb_device
*dev
= NULL
;
665 struct usb_host_interface
*iface_desc
= NULL
;
666 struct usb_endpoint_descriptor
*rx_endpoint
= NULL
;
667 struct usb_endpoint_descriptor
*tx_endpoint
= NULL
;
668 struct urb
*rx_urb
= NULL
;
669 struct urb
*tx_urb
= NULL
;
670 struct lirc_driver
*driver
= NULL
;
671 struct lirc_buffer
*rbuf
= NULL
;
678 struct sasem_context
*context
= NULL
;
681 dev_info(&interface
->dev
, "%s: found Sasem device\n", __func__
);
684 dev
= usb_get_dev(interface_to_usbdev(interface
));
685 iface_desc
= interface
->cur_altsetting
;
686 num_endpoints
= iface_desc
->desc
.bNumEndpoints
;
689 * Scan the endpoint list and set:
690 * first input endpoint = IR endpoint
691 * first output endpoint = VFD endpoint
697 for (i
= 0; i
< num_endpoints
&& !(ir_ep_found
&& vfd_ep_found
); ++i
) {
699 struct usb_endpoint_descriptor
*ep
;
703 ep
= &iface_desc
->endpoint
[i
].desc
;
704 ep_dir
= ep
->bEndpointAddress
& USB_ENDPOINT_DIR_MASK
;
705 ep_type
= ep
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
;
708 ep_dir
== USB_DIR_IN
&&
709 ep_type
== USB_ENDPOINT_XFER_INT
) {
714 dev_info(&interface
->dev
,
715 "%s: found IR endpoint\n", __func__
);
717 } else if (!vfd_ep_found
&&
718 ep_dir
== USB_DIR_OUT
&&
719 ep_type
== USB_ENDPOINT_XFER_INT
) {
724 dev_info(&interface
->dev
,
725 "%s: found VFD endpoint\n", __func__
);
729 /* Input endpoint is mandatory */
731 dev_err(&interface
->dev
,
732 "%s: no valid input (IR) endpoint found.\n", __func__
);
738 dev_info(&interface
->dev
,
739 "%s: no valid output (VFD) endpoint found.\n",
743 /* Allocate memory */
746 context
= kzalloc(sizeof(struct sasem_context
), GFP_KERNEL
);
749 goto alloc_status_switch
;
751 driver
= kzalloc(sizeof(struct lirc_driver
), GFP_KERNEL
);
754 goto alloc_status_switch
;
756 rbuf
= kmalloc(sizeof(struct lirc_buffer
), GFP_KERNEL
);
759 goto alloc_status_switch
;
761 if (lirc_buffer_init(rbuf
, BUF_CHUNK_SIZE
, BUF_SIZE
)) {
762 dev_err(&interface
->dev
,
763 "%s: lirc_buffer_init failed\n", __func__
);
765 goto alloc_status_switch
;
767 rx_urb
= usb_alloc_urb(0, GFP_KERNEL
);
769 dev_err(&interface
->dev
,
770 "%s: usb_alloc_urb failed for IR urb\n", __func__
);
772 goto alloc_status_switch
;
775 tx_urb
= usb_alloc_urb(0, GFP_KERNEL
);
777 dev_err(&interface
->dev
,
778 "%s: usb_alloc_urb failed for VFD urb",
781 goto alloc_status_switch
;
785 mutex_init(&context
->ctx_lock
);
787 strcpy(driver
->name
, MOD_NAME
);
789 driver
->code_length
= 64;
790 driver
->sample_rate
= 0;
791 driver
->features
= LIRC_CAN_REC_LIRCCODE
;
792 driver
->data
= context
;
794 driver
->set_use_inc
= ir_open
;
795 driver
->set_use_dec
= ir_close
;
796 driver
->dev
= &interface
->dev
;
797 driver
->owner
= THIS_MODULE
;
799 mutex_lock(&context
->ctx_lock
);
801 lirc_minor
= lirc_register_driver(driver
);
802 if (lirc_minor
< 0) {
803 dev_err(&interface
->dev
,
804 "%s: lirc_register_driver failed\n", __func__
);
809 dev_info(&interface
->dev
,
810 "%s: Registered Sasem driver (minor:%d)\n",
811 __func__
, lirc_minor
);
813 /* Needed while unregistering! */
814 driver
->minor
= lirc_minor
;
817 context
->dev_present
= 1;
818 context
->rx_endpoint
= rx_endpoint
;
819 context
->rx_urb
= rx_urb
;
821 context
->tx_endpoint
= tx_endpoint
;
822 context
->tx_urb
= tx_urb
;
823 context
->vfd_contrast
= 1000; /* range 0 - 1000 */
825 context
->driver
= driver
;
827 usb_set_intfdata(interface
, context
);
832 dev_info(&interface
->dev
,
833 "Registering VFD with sysfs\n");
834 if (usb_register_dev(interface
, &sasem_class
))
835 /* Not a fatal error, so ignore */
836 dev_info(&interface
->dev
,
837 "%s: could not get a minor number for VFD\n",
841 dev_info(&interface
->dev
,
842 "%s: Sasem device on usb<%d:%d> initialized\n",
843 __func__
, dev
->bus
->busnum
, dev
->devnum
);
845 mutex_unlock(&context
->ctx_lock
);
848 switch (alloc_status
) {
852 usb_free_urb(tx_urb
);
854 usb_free_urb(rx_urb
);
857 lirc_buffer_free(rbuf
);
879 * Callback function for USB core API: disconnect
881 static void sasem_disconnect(struct usb_interface
*interface
)
883 struct sasem_context
*context
;
885 /* prevent races with ir_open()/vfd_open() */
886 mutex_lock(&disconnect_lock
);
888 context
= usb_get_intfdata(interface
);
889 mutex_lock(&context
->ctx_lock
);
891 dev_info(&interface
->dev
, "%s: Sasem device disconnected\n",
894 usb_set_intfdata(interface
, NULL
);
895 context
->dev_present
= 0;
898 usb_kill_urb(context
->rx_urb
);
900 /* Abort ongoing write */
901 if (atomic_read(&context
->tx
.busy
)) {
903 usb_kill_urb(context
->tx_urb
);
904 wait_for_completion(&context
->tx
.finished
);
907 /* De-register from lirc_dev if IR port is not open */
908 if (!context
->ir_isopen
)
909 deregister_from_lirc(context
);
911 usb_deregister_dev(interface
, &sasem_class
);
913 mutex_unlock(&context
->ctx_lock
);
915 if (!context
->ir_isopen
&& !context
->vfd_isopen
)
916 delete_context(context
);
918 mutex_unlock(&disconnect_lock
);
921 module_usb_driver(sasem_driver
);