2 * Generic USB driver for report based interrupt in/out devices
3 * like LD Didactic's USB devices. LD Didactic's USB devices are
4 * HID devices which do not use HID report definitons (they use
5 * raw interrupt in and our reports only for communication).
7 * This driver uses a ring buffer for time critical reading of
8 * interrupt in reports and provides read and write methods for
9 * raw interrupt reports (similar to the Windows HID driver).
10 * Devices based on the book USB COMPLETE by Jan Axelson may need
11 * such a compatibility to the Windows HID driver.
13 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * Derived from Lego USB Tower driver
21 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
22 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
24 * V0.1 (mh) Initial version
25 * V0.11 (mh) Added raw support for HID 1.0 devices (no interrupt out endpoint)
26 * V0.12 (mh) Added kmalloc check for string buffer
27 * V0.13 (mh) Added support for LD X-Ray and Machine Test System
30 #include <linux/config.h>
31 #include <linux/kernel.h>
32 #include <linux/errno.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/module.h>
36 #include <linux/mutex.h>
38 #include <asm/uaccess.h>
39 #include <linux/input.h>
40 #include <linux/usb.h>
41 #include <linux/poll.h>
43 /* Define these values to match your devices */
44 #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
45 #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S */
46 #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
47 #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
48 #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
49 #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
50 #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
51 #define USB_DEVICE_ID_LD_XRAY1 0x1100 /* USB Product ID of X-Ray Apparatus */
52 #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus */
53 #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
54 #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
55 #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
56 #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
57 #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
58 #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
60 #define USB_VENDOR_ID_VERNIER 0x08f7
61 #define USB_DEVICE_ID_VERNIER_LABPRO 0x0001
62 #define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002
63 #define USB_DEVICE_ID_VERNIER_SKIP 0x0003
64 #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
67 #ifdef CONFIG_USB_DYNAMIC_MINORS
68 #define USB_LD_MINOR_BASE 0
70 #define USB_LD_MINOR_BASE 176
73 /* table of devices that work with this driver */
74 static struct usb_device_id ld_usb_table
[] = {
75 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_CASSY
) },
76 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_POCKETCASSY
) },
77 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_MOBILECASSY
) },
78 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_JWM
) },
79 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_DMMP
) },
80 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_UMIP
) },
81 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_XRAY1
) },
82 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_XRAY2
) },
83 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_VIDEOCOM
) },
84 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_COM3LAB
) },
85 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_TELEPORT
) },
86 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_NETWORKANALYSER
) },
87 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_POWERCONTROL
) },
88 { USB_DEVICE(USB_VENDOR_ID_LD
, USB_DEVICE_ID_LD_MACHINETEST
) },
89 { USB_DEVICE(USB_VENDOR_ID_VERNIER
, USB_DEVICE_ID_VERNIER_LABPRO
) },
90 { USB_DEVICE(USB_VENDOR_ID_VERNIER
, USB_DEVICE_ID_VERNIER_GOTEMP
) },
91 { USB_DEVICE(USB_VENDOR_ID_VERNIER
, USB_DEVICE_ID_VERNIER_SKIP
) },
92 { USB_DEVICE(USB_VENDOR_ID_VERNIER
, USB_DEVICE_ID_VERNIER_CYCLOPS
) },
93 { } /* Terminating entry */
95 MODULE_DEVICE_TABLE(usb
, ld_usb_table
);
96 MODULE_VERSION("V0.13");
97 MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
98 MODULE_DESCRIPTION("LD USB Driver");
99 MODULE_LICENSE("GPL");
100 MODULE_SUPPORTED_DEVICE("LD USB Devices");
102 #ifdef CONFIG_USB_DEBUG
103 static int debug
= 1;
105 static int debug
= 0;
108 /* Use our own dbg macro */
109 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
111 /* Module parameters */
112 module_param(debug
, int, S_IRUGO
| S_IWUSR
);
113 MODULE_PARM_DESC(debug
, "Debug enabled or not");
115 /* All interrupt in transfers are collected in a ring buffer to
116 * avoid racing conditions and get better performance of the driver.
118 static int ring_buffer_size
= 128;
119 module_param(ring_buffer_size
, int, 0);
120 MODULE_PARM_DESC(ring_buffer_size
, "Read ring buffer size in reports");
122 /* The write_buffer can contain more than one interrupt out transfer.
124 static int write_buffer_size
= 10;
125 module_param(write_buffer_size
, int, 0);
126 MODULE_PARM_DESC(write_buffer_size
, "Write buffer size in reports");
128 /* As of kernel version 2.6.4 ehci-hcd uses an
129 * "only one interrupt transfer per frame" shortcut
130 * to simplify the scheduling of periodic transfers.
131 * This conflicts with our standard 1ms intervals for in and out URBs.
132 * We use default intervals of 2ms for in and 2ms for out transfers,
133 * which should be fast enough.
134 * Increase the interval to allow more devices that do interrupt transfers,
135 * or set to 1 to use the standard interval from the endpoint descriptors.
137 static int min_interrupt_in_interval
= 2;
138 module_param(min_interrupt_in_interval
, int, 0);
139 MODULE_PARM_DESC(min_interrupt_in_interval
, "Minimum interrupt in interval in ms");
141 static int min_interrupt_out_interval
= 2;
142 module_param(min_interrupt_out_interval
, int, 0);
143 MODULE_PARM_DESC(min_interrupt_out_interval
, "Minimum interrupt out interval in ms");
145 /* Structure to hold all of our device specific stuff */
147 struct semaphore sem
; /* locks this structure */
148 struct usb_interface
* intf
; /* save off the usb interface pointer */
150 int open_count
; /* number of times this port has been opened */
153 unsigned int ring_head
;
154 unsigned int ring_tail
;
156 wait_queue_head_t read_wait
;
157 wait_queue_head_t write_wait
;
159 char* interrupt_in_buffer
;
160 struct usb_endpoint_descriptor
* interrupt_in_endpoint
;
161 struct urb
* interrupt_in_urb
;
162 int interrupt_in_interval
;
163 size_t interrupt_in_endpoint_size
;
164 int interrupt_in_running
;
165 int interrupt_in_done
;
167 char* interrupt_out_buffer
;
168 struct usb_endpoint_descriptor
* interrupt_out_endpoint
;
169 struct urb
* interrupt_out_urb
;
170 int interrupt_out_interval
;
171 size_t interrupt_out_endpoint_size
;
172 int interrupt_out_busy
;
175 /* prevent races between open() and disconnect() */
176 static DEFINE_MUTEX(disconnect_mutex
);
178 static struct usb_driver ld_usb_driver
;
181 * ld_usb_abort_transfers
182 * aborts transfers and frees associated data structures
184 static void ld_usb_abort_transfers(struct ld_usb
*dev
)
186 /* shutdown transfer */
187 if (dev
->interrupt_in_running
) {
188 dev
->interrupt_in_running
= 0;
190 usb_kill_urb(dev
->interrupt_in_urb
);
192 if (dev
->interrupt_out_busy
)
194 usb_kill_urb(dev
->interrupt_out_urb
);
200 static void ld_usb_delete(struct ld_usb
*dev
)
202 ld_usb_abort_transfers(dev
);
204 /* free data structures */
205 usb_free_urb(dev
->interrupt_in_urb
);
206 usb_free_urb(dev
->interrupt_out_urb
);
207 kfree(dev
->ring_buffer
);
208 kfree(dev
->interrupt_in_buffer
);
209 kfree(dev
->interrupt_out_buffer
);
214 * ld_usb_interrupt_in_callback
216 static void ld_usb_interrupt_in_callback(struct urb
*urb
, struct pt_regs
*regs
)
218 struct ld_usb
*dev
= urb
->context
;
219 size_t *actual_buffer
;
220 unsigned int next_ring_head
;
224 if (urb
->status
== -ENOENT
||
225 urb
->status
== -ECONNRESET
||
226 urb
->status
== -ESHUTDOWN
) {
229 dbg_info(&dev
->intf
->dev
, "%s: nonzero status received: %d\n",
230 __FUNCTION__
, urb
->status
);
231 goto resubmit
; /* maybe we can recover */
235 if (urb
->actual_length
> 0) {
236 next_ring_head
= (dev
->ring_head
+1) % ring_buffer_size
;
237 if (next_ring_head
!= dev
->ring_tail
) {
238 actual_buffer
= (size_t*)(dev
->ring_buffer
+ dev
->ring_head
*(sizeof(size_t)+dev
->interrupt_in_endpoint_size
));
239 /* actual_buffer gets urb->actual_length + interrupt_in_buffer */
240 *actual_buffer
= urb
->actual_length
;
241 memcpy(actual_buffer
+1, dev
->interrupt_in_buffer
, urb
->actual_length
);
242 dev
->ring_head
= next_ring_head
;
243 dbg_info(&dev
->intf
->dev
, "%s: received %d bytes\n",
244 __FUNCTION__
, urb
->actual_length
);
246 dev_warn(&dev
->intf
->dev
,
247 "Ring buffer overflow, %d bytes dropped\n",
252 /* resubmit if we're still running */
253 if (dev
->interrupt_in_running
&& dev
->intf
) {
254 retval
= usb_submit_urb(dev
->interrupt_in_urb
, GFP_ATOMIC
);
256 dev_err(&dev
->intf
->dev
,
257 "usb_submit_urb failed (%d)\n", retval
);
261 dev
->interrupt_in_done
= 1;
262 wake_up_interruptible(&dev
->read_wait
);
266 * ld_usb_interrupt_out_callback
268 static void ld_usb_interrupt_out_callback(struct urb
*urb
, struct pt_regs
*regs
)
270 struct ld_usb
*dev
= urb
->context
;
272 /* sync/async unlink faults aren't errors */
273 if (urb
->status
&& !(urb
->status
== -ENOENT
||
274 urb
->status
== -ECONNRESET
||
275 urb
->status
== -ESHUTDOWN
))
276 dbg_info(&dev
->intf
->dev
,
277 "%s - nonzero write interrupt status received: %d\n",
278 __FUNCTION__
, urb
->status
);
280 dev
->interrupt_out_busy
= 0;
281 wake_up_interruptible(&dev
->write_wait
);
287 static int ld_usb_open(struct inode
*inode
, struct file
*file
)
292 struct usb_interface
*interface
;
294 nonseekable_open(inode
, file
);
295 subminor
= iminor(inode
);
297 mutex_lock(&disconnect_mutex
);
299 interface
= usb_find_interface(&ld_usb_driver
, subminor
);
302 err("%s - error, can't find device for minor %d\n",
303 __FUNCTION__
, subminor
);
305 goto unlock_disconnect_exit
;
308 dev
= usb_get_intfdata(interface
);
312 goto unlock_disconnect_exit
;
315 /* lock this device */
316 if (down_interruptible(&dev
->sem
)) {
317 retval
= -ERESTARTSYS
;
318 goto unlock_disconnect_exit
;
321 /* allow opening only once */
322 if (dev
->open_count
) {
328 /* initialize in direction */
331 usb_fill_int_urb(dev
->interrupt_in_urb
,
332 interface_to_usbdev(interface
),
333 usb_rcvintpipe(interface_to_usbdev(interface
),
334 dev
->interrupt_in_endpoint
->bEndpointAddress
),
335 dev
->interrupt_in_buffer
,
336 dev
->interrupt_in_endpoint_size
,
337 ld_usb_interrupt_in_callback
,
339 dev
->interrupt_in_interval
);
341 dev
->interrupt_in_running
= 1;
342 dev
->interrupt_in_done
= 0;
344 retval
= usb_submit_urb(dev
->interrupt_in_urb
, GFP_KERNEL
);
346 dev_err(&interface
->dev
, "Couldn't submit interrupt_in_urb %d\n", retval
);
347 dev
->interrupt_in_running
= 0;
352 /* save device in the file's private structure */
353 file
->private_data
= dev
;
358 unlock_disconnect_exit
:
359 mutex_unlock(&disconnect_mutex
);
367 static int ld_usb_release(struct inode
*inode
, struct file
*file
)
372 dev
= file
->private_data
;
379 if (down_interruptible(&dev
->sem
)) {
380 retval
= -ERESTARTSYS
;
384 if (dev
->open_count
!= 1) {
388 if (dev
->intf
== NULL
) {
389 /* the device was unplugged before the file was released */
391 /* unlock here as ld_usb_delete frees dev */
396 /* wait until write transfer is finished */
397 if (dev
->interrupt_out_busy
)
398 wait_event_interruptible_timeout(dev
->write_wait
, !dev
->interrupt_out_busy
, 2 * HZ
);
399 ld_usb_abort_transfers(dev
);
412 static unsigned int ld_usb_poll(struct file
*file
, poll_table
*wait
)
415 unsigned int mask
= 0;
417 dev
= file
->private_data
;
419 poll_wait(file
, &dev
->read_wait
, wait
);
420 poll_wait(file
, &dev
->write_wait
, wait
);
422 if (dev
->ring_head
!= dev
->ring_tail
)
423 mask
|= POLLIN
| POLLRDNORM
;
424 if (!dev
->interrupt_out_busy
)
425 mask
|= POLLOUT
| POLLWRNORM
;
433 static ssize_t
ld_usb_read(struct file
*file
, char __user
*buffer
, size_t count
,
437 size_t *actual_buffer
;
438 size_t bytes_to_read
;
441 dev
= file
->private_data
;
443 /* verify that we actually have some data to read */
447 /* lock this object */
448 if (down_interruptible(&dev
->sem
)) {
449 retval
= -ERESTARTSYS
;
453 /* verify that the device wasn't unplugged */
454 if (dev
->intf
== NULL
) {
456 err("No device or device unplugged %d\n", retval
);
461 if (dev
->ring_head
== dev
->ring_tail
) {
462 if (file
->f_flags
& O_NONBLOCK
) {
466 retval
= wait_event_interruptible(dev
->read_wait
, dev
->interrupt_in_done
);
471 /* actual_buffer contains actual_length + interrupt_in_buffer */
472 actual_buffer
= (size_t*)(dev
->ring_buffer
+ dev
->ring_tail
*(sizeof(size_t)+dev
->interrupt_in_endpoint_size
));
473 bytes_to_read
= min(count
, *actual_buffer
);
474 if (bytes_to_read
< *actual_buffer
)
475 dev_warn(&dev
->intf
->dev
, "Read buffer overflow, %zd bytes dropped\n",
476 *actual_buffer
-bytes_to_read
);
478 /* copy one interrupt_in_buffer from ring_buffer into userspace */
479 if (copy_to_user(buffer
, actual_buffer
+1, bytes_to_read
)) {
483 dev
->ring_tail
= (dev
->ring_tail
+1) % ring_buffer_size
;
485 retval
= bytes_to_read
;
488 /* unlock the device */
498 static ssize_t
ld_usb_write(struct file
*file
, const char __user
*buffer
,
499 size_t count
, loff_t
*ppos
)
502 size_t bytes_to_write
;
505 dev
= file
->private_data
;
507 /* verify that we actually have some data to write */
511 /* lock this object */
512 if (down_interruptible(&dev
->sem
)) {
513 retval
= -ERESTARTSYS
;
517 /* verify that the device wasn't unplugged */
518 if (dev
->intf
== NULL
) {
520 err("No device or device unplugged %d\n", retval
);
524 /* wait until previous transfer is finished */
525 if (dev
->interrupt_out_busy
) {
526 if (file
->f_flags
& O_NONBLOCK
) {
530 retval
= wait_event_interruptible(dev
->write_wait
, !dev
->interrupt_out_busy
);
536 /* write the data into interrupt_out_buffer from userspace */
537 bytes_to_write
= min(count
, write_buffer_size
*dev
->interrupt_out_endpoint_size
);
538 if (bytes_to_write
< count
)
539 dev_warn(&dev
->intf
->dev
, "Write buffer overflow, %zd bytes dropped\n",count
-bytes_to_write
);
540 dbg_info(&dev
->intf
->dev
, "%s: count = %zd, bytes_to_write = %zd\n", __FUNCTION__
, count
, bytes_to_write
);
542 if (copy_from_user(dev
->interrupt_out_buffer
, buffer
, bytes_to_write
)) {
547 if (dev
->interrupt_out_endpoint
== NULL
) {
548 /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
549 retval
= usb_control_msg(interface_to_usbdev(dev
->intf
),
550 usb_sndctrlpipe(interface_to_usbdev(dev
->intf
), 0),
552 USB_TYPE_CLASS
| USB_RECIP_INTERFACE
| USB_DIR_OUT
,
554 dev
->interrupt_out_buffer
,
556 USB_CTRL_SET_TIMEOUT
* HZ
);
558 err("Couldn't submit HID_REQ_SET_REPORT %d\n", retval
);
562 /* send off the urb */
563 usb_fill_int_urb(dev
->interrupt_out_urb
,
564 interface_to_usbdev(dev
->intf
),
565 usb_sndintpipe(interface_to_usbdev(dev
->intf
),
566 dev
->interrupt_out_endpoint
->bEndpointAddress
),
567 dev
->interrupt_out_buffer
,
569 ld_usb_interrupt_out_callback
,
571 dev
->interrupt_out_interval
);
573 dev
->interrupt_out_busy
= 1;
576 retval
= usb_submit_urb(dev
->interrupt_out_urb
, GFP_KERNEL
);
578 dev
->interrupt_out_busy
= 0;
579 err("Couldn't submit interrupt_out_urb %d\n", retval
);
582 retval
= bytes_to_write
;
585 /* unlock the device */
592 /* file operations needed when we register this driver */
593 static struct file_operations ld_usb_fops
= {
594 .owner
= THIS_MODULE
,
596 .write
= ld_usb_write
,
598 .release
= ld_usb_release
,
603 * usb class driver info in order to get a minor number from the usb core,
604 * and to have the device registered with the driver core
606 static struct usb_class_driver ld_usb_class
= {
608 .fops
= &ld_usb_fops
,
609 .minor_base
= USB_LD_MINOR_BASE
,
615 * Called by the usb core when a new device is connected that it thinks
616 * this driver might be interested in.
618 static int ld_usb_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
620 struct usb_device
*udev
= interface_to_usbdev(intf
);
621 struct ld_usb
*dev
= NULL
;
622 struct usb_host_interface
*iface_desc
;
623 struct usb_endpoint_descriptor
*endpoint
;
626 int retval
= -ENOMEM
;
628 /* allocate memory for our device state and intialize it */
630 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
632 dev_err(&intf
->dev
, "Out of memory\n");
635 init_MUTEX(&dev
->sem
);
637 init_waitqueue_head(&dev
->read_wait
);
638 init_waitqueue_head(&dev
->write_wait
);
640 /* workaround for early firmware versions on fast computers */
641 if ((le16_to_cpu(udev
->descriptor
.idVendor
) == USB_VENDOR_ID_LD
) &&
642 ((le16_to_cpu(udev
->descriptor
.idProduct
) == USB_DEVICE_ID_LD_CASSY
) ||
643 (le16_to_cpu(udev
->descriptor
.idProduct
) == USB_DEVICE_ID_LD_COM3LAB
)) &&
644 (le16_to_cpu(udev
->descriptor
.bcdDevice
) <= 0x103)) {
645 buffer
= kmalloc(256, GFP_KERNEL
);
646 if (buffer
== NULL
) {
647 dev_err(&intf
->dev
, "Couldn't allocate string buffer\n");
650 /* usb_string makes SETUP+STALL to leave always ControlReadLoop */
651 usb_string(udev
, 255, buffer
, 256);
655 iface_desc
= intf
->cur_altsetting
;
657 /* set up the endpoint information */
658 for (i
= 0; i
< iface_desc
->desc
.bNumEndpoints
; ++i
) {
659 endpoint
= &iface_desc
->endpoint
[i
].desc
;
661 if (((endpoint
->bEndpointAddress
& USB_ENDPOINT_DIR_MASK
) == USB_DIR_IN
) &&
662 ((endpoint
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) == USB_ENDPOINT_XFER_INT
)) {
663 dev
->interrupt_in_endpoint
= endpoint
;
666 if (((endpoint
->bEndpointAddress
& USB_ENDPOINT_DIR_MASK
) == USB_DIR_OUT
) &&
667 ((endpoint
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) == USB_ENDPOINT_XFER_INT
)) {
668 dev
->interrupt_out_endpoint
= endpoint
;
671 if (dev
->interrupt_in_endpoint
== NULL
) {
672 dev_err(&intf
->dev
, "Interrupt in endpoint not found\n");
675 if (dev
->interrupt_out_endpoint
== NULL
)
676 dev_warn(&intf
->dev
, "Interrupt out endpoint not found (using control endpoint instead)\n");
678 dev
->interrupt_in_endpoint_size
= le16_to_cpu(dev
->interrupt_in_endpoint
->wMaxPacketSize
);
679 dev
->ring_buffer
= kmalloc(ring_buffer_size
*(sizeof(size_t)+dev
->interrupt_in_endpoint_size
), GFP_KERNEL
);
680 if (!dev
->ring_buffer
) {
681 dev_err(&intf
->dev
, "Couldn't allocate ring_buffer\n");
684 dev
->interrupt_in_buffer
= kmalloc(dev
->interrupt_in_endpoint_size
, GFP_KERNEL
);
685 if (!dev
->interrupt_in_buffer
) {
686 dev_err(&intf
->dev
, "Couldn't allocate interrupt_in_buffer\n");
689 dev
->interrupt_in_urb
= usb_alloc_urb(0, GFP_KERNEL
);
690 if (!dev
->interrupt_in_urb
) {
691 dev_err(&intf
->dev
, "Couldn't allocate interrupt_in_urb\n");
694 dev
->interrupt_out_endpoint_size
= dev
->interrupt_out_endpoint
? le16_to_cpu(dev
->interrupt_out_endpoint
->wMaxPacketSize
) :
695 udev
->descriptor
.bMaxPacketSize0
;
696 dev
->interrupt_out_buffer
= kmalloc(write_buffer_size
*dev
->interrupt_out_endpoint_size
, GFP_KERNEL
);
697 if (!dev
->interrupt_out_buffer
) {
698 dev_err(&intf
->dev
, "Couldn't allocate interrupt_out_buffer\n");
701 dev
->interrupt_out_urb
= usb_alloc_urb(0, GFP_KERNEL
);
702 if (!dev
->interrupt_out_urb
) {
703 dev_err(&intf
->dev
, "Couldn't allocate interrupt_out_urb\n");
706 dev
->interrupt_in_interval
= min_interrupt_in_interval
> dev
->interrupt_in_endpoint
->bInterval
? min_interrupt_in_interval
: dev
->interrupt_in_endpoint
->bInterval
;
707 if (dev
->interrupt_out_endpoint
)
708 dev
->interrupt_out_interval
= min_interrupt_out_interval
> dev
->interrupt_out_endpoint
->bInterval
? min_interrupt_out_interval
: dev
->interrupt_out_endpoint
->bInterval
;
710 /* we can register the device now, as it is ready */
711 usb_set_intfdata(intf
, dev
);
713 retval
= usb_register_dev(intf
, &ld_usb_class
);
715 /* something prevented us from registering this driver */
716 dev_err(&intf
->dev
, "Not able to get a minor for this device.\n");
717 usb_set_intfdata(intf
, NULL
);
721 /* let the user know what node this device is now attached to */
722 dev_info(&intf
->dev
, "LD USB Device #%d now attached to major %d minor %d\n",
723 (intf
->minor
- USB_LD_MINOR_BASE
), USB_MAJOR
, intf
->minor
);
737 * Called by the usb core when the device is removed from the system.
739 static void ld_usb_disconnect(struct usb_interface
*intf
)
744 mutex_lock(&disconnect_mutex
);
746 dev
= usb_get_intfdata(intf
);
747 usb_set_intfdata(intf
, NULL
);
753 /* give back our minor */
754 usb_deregister_dev(intf
, &ld_usb_class
);
756 /* if the device is not opened, then we clean up right now */
757 if (!dev
->open_count
) {
765 mutex_unlock(&disconnect_mutex
);
767 dev_info(&intf
->dev
, "LD USB Device #%d now disconnected\n",
768 (minor
- USB_LD_MINOR_BASE
));
771 /* usb specific object needed to register this driver with the usb subsystem */
772 static struct usb_driver ld_usb_driver
= {
774 .probe
= ld_usb_probe
,
775 .disconnect
= ld_usb_disconnect
,
776 .id_table
= ld_usb_table
,
782 static int __init
ld_usb_init(void)
786 /* register this driver with the USB subsystem */
787 retval
= usb_register(&ld_usb_driver
);
789 err("usb_register failed for the "__FILE__
" driver. Error number %d\n", retval
);
797 static void __exit
ld_usb_exit(void)
799 /* deregister this driver with the USB subsystem */
800 usb_deregister(&ld_usb_driver
);
803 module_init(ld_usb_init
);
804 module_exit(ld_usb_exit
);