2 * Frontier Designs Alphatrack driver
4 * Copyright (C) 2007 Michael Taht (m@taht.net)
6 * Based on the usbled driver and ldusb drivers by
8 * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com)
9 * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
11 * The ldusb driver was, in turn, derived from Lego USB Tower driver
12 * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
13 * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
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, version 2.
22 * This driver uses a ring buffer for time critical reading of
23 * interrupt in reports and provides read and write methods for
24 * raw interrupt reports.
27 /* Note: this currently uses a dumb ringbuffer for reads and writes.
28 * A more optimal driver would cache and kill off outstanding urbs that are
29 * now invalid, and ignore ones that already were in the queue but valid
30 * as we only have 30 commands for the alphatrack. In particular this is
31 * key for getting lights to flash in time as otherwise many commands
32 * can be buffered up before the light change makes it to the interface.
35 #include <linux/kernel.h>
36 #include <linux/errno.h>
37 #include <linux/init.h>
38 #include <linux/slab.h>
39 #include <linux/module.h>
40 #include <linux/kobject.h>
41 #include <linux/mutex.h>
42 #include <linux/version.h>
44 #include <asm/uaccess.h>
45 #include <linux/input.h>
46 #include <linux/usb.h>
47 #include <linux/poll.h>
49 #include "surface_sysfs.h"
51 /* make this work on older kernel versions */
53 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
54 #include "frontier_compat.h"
55 #endif /* older kernel versions */
57 #include "alphatrack.h"
59 #define VENDOR_ID 0x165b
60 #define PRODUCT_ID 0xfad1
62 #ifdef CONFIG_USB_DYNAMIC_MINORS
63 #define USB_ALPHATRACK_MINOR_BASE 0
65 // FIXME 176 - is another driver's minor - apply for that
66 // #define USB_ALPHATRACK_MINOR_BASE 177
67 #define USB_ALPHATRACK_MINOR_BASE 176
70 /* table of devices that work with this driver */
71 static struct usb_device_id usb_alphatrack_table
[] = {
72 { USB_DEVICE(VENDOR_ID
, PRODUCT_ID
) },
73 { } /* Terminating entry */
76 MODULE_DEVICE_TABLE(usb
, usb_alphatrack_table
);
77 MODULE_VERSION("0.40");
78 MODULE_AUTHOR("Mike Taht <m@taht.net>");
79 MODULE_DESCRIPTION("Alphatrack USB Driver");
80 MODULE_LICENSE("GPL");
81 MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface");
83 /* These aren't done yet */
85 #define SUPPRESS_EXTRA_ONLINE_EVENTS 0
86 #define BUFFERED_WRITES 0
87 #define SUPPRESS_EXTRA_OFFLINE_EVENTS 0
88 #define COMPRESS_FADER_EVENTS 0
90 #define BUFFERED_READS 1
91 #define RING_BUFFER_SIZE 512
92 #define WRITE_BUFFER_SIZE 34
93 #define ALPHATRACK_USB_TIMEOUT 10
94 #define OUTPUT_CMD_SIZE 8
95 #define INPUT_CMD_SIZE 12
100 /* Use our own dbg macro */
101 #define dbg_info(dev, format, arg...) do { if (debug) dev_info(dev , format , ## arg); } while (0)
103 #define alphatrack_ocmd_info(dev, cmd, format, arg...)
105 #define alphatrack_icmd_info(dev, cmd, format, arg...)
108 /* Module parameters */
110 module_param(debug
, int, S_IRUGO
| S_IWUSR
);
111 MODULE_PARM_DESC(debug
, "Debug enabled or not");
113 /* All interrupt in transfers are collected in a ring buffer to
114 * avoid racing conditions and get better performance of the driver.
117 static int ring_buffer_size
= RING_BUFFER_SIZE
;
119 module_param(ring_buffer_size
, int, S_IRUGO
);
120 MODULE_PARM_DESC(ring_buffer_size
, "Read ring buffer size");
122 /* The write_buffer can one day contain more than one interrupt out transfer.
125 static int write_buffer_size
= WRITE_BUFFER_SIZE
;
126 module_param(write_buffer_size
, int, S_IRUGO
);
127 MODULE_PARM_DESC(write_buffer_size
, "Write buffer size");
130 * Increase the interval for debugging purposes.
131 * or set to 1 to use the standard interval from the endpoint descriptors.
134 static int min_interrupt_in_interval
= ALPHATRACK_USB_TIMEOUT
;
135 module_param(min_interrupt_in_interval
, int, 0);
136 MODULE_PARM_DESC(min_interrupt_in_interval
, "Minimum interrupt in interval in ms");
138 static int min_interrupt_out_interval
= ALPHATRACK_USB_TIMEOUT
;
139 module_param(min_interrupt_out_interval
, int, 0);
140 MODULE_PARM_DESC(min_interrupt_out_interval
, "Minimum interrupt out interval in ms");
144 /* Structure to hold all of our device specific stuff */
146 struct usb_alphatrack
{
147 struct semaphore sem
; /* locks this structure */
148 struct usb_interface
* intf
; /* save off the usb interface pointer */
149 int open_count
; /* number of times this port has been opened */
151 struct alphatrack_icmd (*ring_buffer
)[RING_BUFFER_SIZE
]; /* just make c happy */
152 struct alphatrack_ocmd (*write_buffer
)[WRITE_BUFFER_SIZE
]; /* just make c happy */
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 unsigned char* interrupt_in_buffer
;
160 unsigned char* oldi_buffer
;
161 struct usb_endpoint_descriptor
* interrupt_in_endpoint
;
162 struct urb
* interrupt_in_urb
;
163 int interrupt_in_interval
;
164 size_t interrupt_in_endpoint_size
;
165 int interrupt_in_running
;
166 int interrupt_in_done
;
168 char* interrupt_out_buffer
;
169 struct usb_endpoint_descriptor
* interrupt_out_endpoint
;
170 struct urb
* interrupt_out_urb
;
171 int interrupt_out_interval
;
172 size_t interrupt_out_endpoint_size
;
173 int interrupt_out_busy
;
175 atomic_t writes_pending
;
176 int event
; /* alternate interface to events */
177 int fader
; /* 10 bits */
178 int lights
; /* 23 bits */
179 unsigned char dump_state
; /* 0 if disabled 1 if enabled */
180 unsigned char enable
; /* 0 if disabled 1 if enabled */
181 unsigned char offline
; /* if the device is out of range or asleep */
182 unsigned char verbose
; /* be verbose in error reporting */
183 unsigned char last_cmd
[OUTPUT_CMD_SIZE
];
184 unsigned char screen
[32];
187 /* prevent races between open() and disconnect() */
188 static DEFINE_MUTEX(disconnect_mutex
);
190 /* forward declaration */
192 static struct usb_driver usb_alphatrack_driver
;
195 * usb_alphatrack_abort_transfers
196 * aborts transfers and frees associated data structures
198 static void usb_alphatrack_abort_transfers(struct usb_alphatrack
*dev
)
200 /* shutdown transfer */
201 if (dev
->interrupt_in_running
) {
202 dev
->interrupt_in_running
= 0;
204 usb_kill_urb(dev
->interrupt_in_urb
);
206 if (dev
->interrupt_out_busy
)
208 usb_kill_urb(dev
->interrupt_out_urb
);
212 * usb_alphatrack_delete
214 static void usb_alphatrack_delete(struct usb_alphatrack
*dev
)
216 usb_alphatrack_abort_transfers(dev
);
217 usb_free_urb(dev
->interrupt_in_urb
);
218 usb_free_urb(dev
->interrupt_out_urb
);
219 kfree(dev
->ring_buffer
);
220 kfree(dev
->interrupt_in_buffer
);
221 kfree(dev
->interrupt_out_buffer
);
222 kfree(dev
); // fixme oldi_buffer
226 * usb_alphatrack_interrupt_in_callback
229 static void usb_alphatrack_interrupt_in_callback(struct urb
*urb
)
231 struct usb_alphatrack
*dev
= urb
->context
;
232 unsigned int next_ring_head
;
236 if (urb
->status
== -ENOENT
||
237 urb
->status
== -ECONNRESET
||
238 urb
->status
== -ESHUTDOWN
) {
241 dbg_info(&dev
->intf
->dev
, "%s: nonzero status received: %d\n",
242 __func__
, urb
->status
);
243 goto resubmit
; /* maybe we can recover */
247 if (urb
->actual_length
!= INPUT_CMD_SIZE
) {
248 dev_warn(&dev
->intf
->dev
,
249 "Urb length was %d bytes!! Do something intelligent \n", urb
->actual_length
);
251 alphatrack_ocmd_info(&dev
->intf
->dev
,&(*dev
->ring_buffer
)[dev
->ring_tail
].cmd
,"%s", "bla");
252 if(memcmp(dev
->interrupt_in_buffer
,dev
->oldi_buffer
,INPUT_CMD_SIZE
)==0) {
255 memcpy(dev
->oldi_buffer
,dev
->interrupt_in_buffer
,INPUT_CMD_SIZE
);
257 #if SUPPRESS_EXTRA_OFFLINE_EVENTS
258 if(dev
->offline
== 2 && dev
->interrupt_in_buffer
[1] == 0xff) { goto resubmit
; }
259 if(dev
->offline
== 1 && dev
->interrupt_in_buffer
[1] == 0xff) { dev
->offline
= 2; goto resubmit
; }
260 /* Always pass one offline event up the stack */
261 if(dev
->offline
> 0 && dev
->interrupt_in_buffer
[1] != 0xff) { dev
->offline
= 0; }
262 if(dev
->offline
== 0 && dev
->interrupt_in_buffer
[1] == 0xff) { dev
->offline
= 1; }
264 dbg_info(&dev
->intf
->dev
, "%s: head, tail are %x, %x\n", __func__
,dev
->ring_head
,dev
->ring_tail
);
265 next_ring_head
= (dev
->ring_head
+1) % ring_buffer_size
;
267 if (next_ring_head
!= dev
->ring_tail
) {
268 memcpy(&((*dev
->ring_buffer
)[dev
->ring_head
]),
269 dev
->interrupt_in_buffer
, urb
->actual_length
);
270 dev
->ring_head
= next_ring_head
;
272 memset(dev
->interrupt_in_buffer
, 0, urb
->actual_length
);
274 dev_warn(&dev
->intf
->dev
,
275 "Ring buffer overflow, %d bytes dropped\n",
277 memset(dev
->interrupt_in_buffer
, 0, urb
->actual_length
);
282 /* resubmit if we're still running */
283 if (dev
->interrupt_in_running
&& dev
->intf
) {
284 retval
= usb_submit_urb(dev
->interrupt_in_urb
, GFP_ATOMIC
);
286 dev_err(&dev
->intf
->dev
,
287 "usb_submit_urb failed (%d)\n", retval
);
291 dev
->interrupt_in_done
= 1;
292 wake_up_interruptible(&dev
->read_wait
);
296 * usb_alphatrack_interrupt_out_callback
298 static void usb_alphatrack_interrupt_out_callback(struct urb
*urb
)
300 struct usb_alphatrack
*dev
= urb
->context
;
302 /* sync/async unlink faults aren't errors */
303 if (urb
->status
&& !(urb
->status
== -ENOENT
||
304 urb
->status
== -ECONNRESET
||
305 urb
->status
== -ESHUTDOWN
))
306 dbg_info(&dev
->intf
->dev
,
307 "%s - nonzero write interrupt status received: %d\n",
308 __func__
, urb
->status
);
309 atomic_dec(&dev
->writes_pending
);
310 dev
->interrupt_out_busy
= 0;
311 wake_up_interruptible(&dev
->write_wait
);
315 * usb_alphatrack_open
317 static int usb_alphatrack_open(struct inode
*inode
, struct file
*file
)
319 struct usb_alphatrack
*dev
;
322 struct usb_interface
*interface
;
324 nonseekable_open(inode
, file
);
325 subminor
= iminor(inode
);
327 mutex_lock(&disconnect_mutex
);
329 interface
= usb_find_interface(&usb_alphatrack_driver
, subminor
);
332 err("%s - error, can't find device for minor %d\n",
335 goto unlock_disconnect_exit
;
338 dev
= usb_get_intfdata(interface
);
342 goto unlock_disconnect_exit
;
345 /* lock this device */
346 if (down_interruptible(&dev
->sem
)) {
347 retval
= -ERESTARTSYS
;
348 goto unlock_disconnect_exit
;
351 /* allow opening only once */
352 if (dev
->open_count
) {
358 /* initialize in direction */
361 usb_fill_int_urb(dev
->interrupt_in_urb
,
362 interface_to_usbdev(interface
),
363 usb_rcvintpipe(interface_to_usbdev(interface
),
364 dev
->interrupt_in_endpoint
->bEndpointAddress
),
365 dev
->interrupt_in_buffer
,
366 dev
->interrupt_in_endpoint_size
,
367 usb_alphatrack_interrupt_in_callback
,
369 dev
->interrupt_in_interval
);
371 dev
->interrupt_in_running
= 1;
372 dev
->interrupt_in_done
= 0;
376 retval
= usb_submit_urb(dev
->interrupt_in_urb
, GFP_KERNEL
);
378 dev_err(&interface
->dev
, "Couldn't submit interrupt_in_urb %d\n", retval
);
379 dev
->interrupt_in_running
= 0;
384 /* save device in the file's private structure */
385 file
->private_data
= dev
;
391 unlock_disconnect_exit
:
392 mutex_unlock(&disconnect_mutex
);
398 * usb_alphatrack_release
400 static int usb_alphatrack_release(struct inode
*inode
, struct file
*file
)
402 struct usb_alphatrack
*dev
;
405 dev
= file
->private_data
;
412 if (down_interruptible(&dev
->sem
)) {
413 retval
= -ERESTARTSYS
;
417 if (dev
->open_count
!= 1) {
422 if (dev
->intf
== NULL
) {
423 /* the device was unplugged before the file was released */
425 /* unlock here as usb_alphatrack_delete frees dev */
426 usb_alphatrack_delete(dev
);
431 /* wait until write transfer is finished */
432 if (dev
->interrupt_out_busy
)
433 wait_event_interruptible_timeout(dev
->write_wait
, !dev
->interrupt_out_busy
, 2 * HZ
);
434 usb_alphatrack_abort_transfers(dev
);
445 * usb_alphatrack_poll
447 static unsigned int usb_alphatrack_poll(struct file
*file
, poll_table
*wait
)
449 struct usb_alphatrack
*dev
;
450 unsigned int mask
= 0;
452 dev
= file
->private_data
;
454 poll_wait(file
, &dev
->read_wait
, wait
);
455 poll_wait(file
, &dev
->write_wait
, wait
);
457 if (dev
->ring_head
!= dev
->ring_tail
)
458 mask
|= POLLIN
| POLLRDNORM
;
459 if (!dev
->interrupt_out_busy
)
460 mask
|= POLLOUT
| POLLWRNORM
;
466 * usb_alphatrack_read
468 static ssize_t
usb_alphatrack_read(struct file
*file
, char __user
*buffer
, size_t count
,
471 struct usb_alphatrack
*dev
;
476 dev
= file
->private_data
;
478 /* verify that we actually have some data to read */
482 /* lock this object */
483 if (down_interruptible(&dev
->sem
)) {
484 retval
= -ERESTARTSYS
;
488 /* verify that the device wasn't unplugged */
489 if (dev
->intf
== NULL
) {
491 err("No device or device unplugged %d\n", retval
);
495 while (dev
->ring_head
== dev
->ring_tail
) {
496 if (file
->f_flags
& O_NONBLOCK
) {
500 dev
->interrupt_in_done
= 0 ;
501 retval
= wait_event_interruptible(dev
->read_wait
, dev
->interrupt_in_done
);
507 alphatrack_ocmd_info(&dev
->intf
->dev
, &(*dev
->ring_buffer
)[dev
->ring_tail
].cmd
, "%s", ": copying to userspace");
510 while((c
< count
) && (dev
->ring_tail
!= dev
->ring_head
)) {
511 if (copy_to_user(&buffer
[c
], &(*dev
->ring_buffer
)[dev
->ring_tail
], INPUT_CMD_SIZE
)) {
515 dev
->ring_tail
= (dev
->ring_tail
+1) % ring_buffer_size
;
517 dbg_info(&dev
->intf
->dev
, "%s: head, tail are %x, %x\n", __func__
,dev
->ring_head
,dev
->ring_tail
);
522 /* unlock the device */
530 * usb_alphatrack_write
532 static ssize_t
usb_alphatrack_write(struct file
*file
, const char __user
*buffer
,
533 size_t count
, loff_t
*ppos
)
535 struct usb_alphatrack
*dev
;
536 size_t bytes_to_write
;
539 dev
= file
->private_data
;
541 /* verify that we actually have some data to write */
545 /* lock this object */
546 if (down_interruptible(&dev
->sem
)) {
547 retval
= -ERESTARTSYS
;
551 /* verify that the device wasn't unplugged */
552 if (dev
->intf
== NULL
) {
554 err("No device or device unplugged %d\n", retval
);
558 /* wait until previous transfer is finished */
559 if (dev
->interrupt_out_busy
) {
560 if (file
->f_flags
& O_NONBLOCK
) {
564 retval
= wait_event_interruptible(dev
->write_wait
, !dev
->interrupt_out_busy
);
570 /* write the data into interrupt_out_buffer from userspace */
571 /* FIXME - if you write more than 12 bytes this breaks */
572 bytes_to_write
= min(count
, write_buffer_size
*dev
->interrupt_out_endpoint_size
);
573 if (bytes_to_write
< count
)
574 dev_warn(&dev
->intf
->dev
, "Write buffer overflow, %zd bytes dropped\n",count
-bytes_to_write
);
576 dbg_info(&dev
->intf
->dev
, "%s: count = %zd, bytes_to_write = %zd\n", __func__
, count
, bytes_to_write
);
578 if (copy_from_user(dev
->interrupt_out_buffer
, buffer
, bytes_to_write
)) {
583 if (dev
->interrupt_out_endpoint
== NULL
) {
584 err("Endpoint should not be be null! \n");
588 /* send off the urb */
589 usb_fill_int_urb(dev
->interrupt_out_urb
,
590 interface_to_usbdev(dev
->intf
),
591 usb_sndintpipe(interface_to_usbdev(dev
->intf
),
592 dev
->interrupt_out_endpoint
->bEndpointAddress
),
593 dev
->interrupt_out_buffer
,
595 usb_alphatrack_interrupt_out_callback
,
597 dev
->interrupt_out_interval
);
598 dev
->interrupt_out_busy
= 1;
599 atomic_inc(&dev
->writes_pending
);
602 retval
= usb_submit_urb(dev
->interrupt_out_urb
, GFP_KERNEL
);
604 dev
->interrupt_out_busy
= 0;
605 err("Couldn't submit interrupt_out_urb %d\n", retval
);
606 atomic_dec(&dev
->writes_pending
);
609 retval
= bytes_to_write
;
612 /* unlock the device */
619 /* file operations needed when we register this driver */
620 static const struct file_operations usb_alphatrack_fops
= {
621 .owner
= THIS_MODULE
,
622 .read
= usb_alphatrack_read
,
623 .write
= usb_alphatrack_write
,
624 .open
= usb_alphatrack_open
,
625 .release
= usb_alphatrack_release
,
626 .poll
= usb_alphatrack_poll
,
630 * usb class driver info in order to get a minor number from the usb core,
631 * and to have the device registered with the driver core
634 static struct usb_class_driver usb_alphatrack_class
= {
635 .name
= "alphatrack%d",
636 .fops
= &usb_alphatrack_fops
,
637 .minor_base
= USB_ALPHATRACK_MINOR_BASE
,
642 * usb_alphatrack_probe
644 * Called by the usb core when a new device is connected that it thinks
645 * this driver might be interested in.
647 static int usb_alphatrack_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
649 struct usb_device
*udev
= interface_to_usbdev(intf
);
650 struct usb_alphatrack
*dev
= NULL
;
651 struct usb_host_interface
*iface_desc
;
652 struct usb_endpoint_descriptor
*endpoint
;
655 int retval
= -ENOMEM
;
657 /* allocate memory for our device state and intialize it */
659 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
661 dev_err(&intf
->dev
, "Out of memory\n");
664 init_MUTEX(&dev
->sem
);
666 init_waitqueue_head(&dev
->read_wait
);
667 init_waitqueue_head(&dev
->write_wait
);
669 iface_desc
= intf
->cur_altsetting
;
671 /* set up the endpoint information */
672 for (i
= 0; i
< iface_desc
->desc
.bNumEndpoints
; ++i
) {
673 endpoint
= &iface_desc
->endpoint
[i
].desc
;
675 if (usb_endpoint_is_int_in(endpoint
))
676 dev
->interrupt_in_endpoint
= endpoint
;
678 if (usb_endpoint_is_int_out(endpoint
))
679 dev
->interrupt_out_endpoint
= endpoint
;
681 if (dev
->interrupt_in_endpoint
== NULL
) {
682 dev_err(&intf
->dev
, "Interrupt in endpoint not found\n");
685 if (dev
->interrupt_out_endpoint
== NULL
)
686 dev_warn(&intf
->dev
, "Interrupt out endpoint not found (using control endpoint instead)\n");
688 dev
->interrupt_in_endpoint_size
= le16_to_cpu(dev
->interrupt_in_endpoint
->wMaxPacketSize
);
690 if (dev
->interrupt_in_endpoint_size
!= 64)
691 dev_warn(&intf
->dev
, "Interrupt in endpoint size is not 64!\n");
693 if(ring_buffer_size
== 0) { ring_buffer_size
= RING_BUFFER_SIZE
; }
695 true_size
= min(ring_buffer_size
,RING_BUFFER_SIZE
);
697 /* FIXME - there are more usb_alloc routines for dma correctness. Needed? */
699 // dev->ring_buffer = kmalloc((true_size*sizeof(struct alphatrack_icmd))+12, GFP_KERNEL);
700 dev
->ring_buffer
= kmalloc((true_size
*sizeof(struct alphatrack_icmd
)), GFP_KERNEL
);
702 if (!dev
->ring_buffer
) {
703 dev_err(&intf
->dev
, "Couldn't allocate input ring_buffer of size %d\n",true_size
);
707 dev
->interrupt_in_buffer
= kmalloc(dev
->interrupt_in_endpoint_size
, GFP_KERNEL
);
709 if (!dev
->interrupt_in_buffer
) {
710 dev_err(&intf
->dev
, "Couldn't allocate interrupt_in_buffer\n");
713 dev
->oldi_buffer
= kmalloc(dev
->interrupt_in_endpoint_size
, GFP_KERNEL
);
714 if (!dev
->oldi_buffer
) {
715 dev_err(&intf
->dev
, "Couldn't allocate old buffer\n");
718 dev
->interrupt_in_urb
= usb_alloc_urb(0, GFP_KERNEL
);
719 if (!dev
->interrupt_in_urb
) {
720 dev_err(&intf
->dev
, "Couldn't allocate interrupt_in_urb\n");
724 dev
->interrupt_out_endpoint_size
= dev
->interrupt_out_endpoint
? le16_to_cpu(dev
->interrupt_out_endpoint
->wMaxPacketSize
) :
725 udev
->descriptor
.bMaxPacketSize0
;
727 if (dev
->interrupt_out_endpoint_size
!=64)
728 dev_warn(&intf
->dev
, "Interrupt out endpoint size is not 64!)\n");
730 if(write_buffer_size
== 0) { write_buffer_size
= WRITE_BUFFER_SIZE
; }
731 true_size
= min(write_buffer_size
,WRITE_BUFFER_SIZE
);
733 dev
->interrupt_out_buffer
= kmalloc(true_size
*dev
->interrupt_out_endpoint_size
, GFP_KERNEL
);
735 if (!dev
->interrupt_out_buffer
) {
736 dev_err(&intf
->dev
, "Couldn't allocate interrupt_out_buffer\n");
740 dev
->write_buffer
= kmalloc(sizeof(struct alphatrack_ocmd
)*true_size
, GFP_KERNEL
);
742 if (!dev
->write_buffer
) {
743 dev_err(&intf
->dev
, "Couldn't allocate write_buffer \n");
747 dev
->interrupt_out_urb
= usb_alloc_urb(0, GFP_KERNEL
);
748 if (!dev
->interrupt_out_urb
) {
749 dev_err(&intf
->dev
, "Couldn't allocate interrupt_out_urb\n");
752 dev
->interrupt_in_interval
= min_interrupt_in_interval
> dev
->interrupt_in_endpoint
->bInterval
? min_interrupt_in_interval
: dev
->interrupt_in_endpoint
->bInterval
;
753 if (dev
->interrupt_out_endpoint
)
754 dev
->interrupt_out_interval
= min_interrupt_out_interval
> dev
->interrupt_out_endpoint
->bInterval
? min_interrupt_out_interval
: dev
->interrupt_out_endpoint
->bInterval
;
756 /* we can register the device now, as it is ready */
757 usb_set_intfdata(intf
, dev
);
759 atomic_set(&dev
->writes_pending
,0);
760 retval
= usb_register_dev(intf
, &usb_alphatrack_class
);
762 /* something prevented us from registering this driver */
763 dev_err(&intf
->dev
, "Not able to get a minor for this device.\n");
764 usb_set_intfdata(intf
, NULL
);
768 /* let the user know what node this device is now attached to */
769 dev_info(&intf
->dev
, "Alphatrack Device #%d now attached to major %d minor %d\n",
770 (intf
->minor
- USB_ALPHATRACK_MINOR_BASE
), USB_MAJOR
, intf
->minor
);
776 usb_alphatrack_delete(dev
);
782 * usb_alphatrack_disconnect
784 * Called by the usb core when the device is removed from the system.
786 static void usb_alphatrack_disconnect(struct usb_interface
*intf
)
788 struct usb_alphatrack
*dev
;
791 mutex_lock(&disconnect_mutex
);
793 dev
= usb_get_intfdata(intf
);
794 usb_set_intfdata(intf
, NULL
);
800 /* give back our minor */
801 usb_deregister_dev(intf
, &usb_alphatrack_class
);
803 /* if the device is not opened, then we clean up right now */
804 if (!dev
->open_count
) {
806 usb_alphatrack_delete(dev
);
812 atomic_set(&dev
->writes_pending
,0);
813 mutex_unlock(&disconnect_mutex
);
815 dev_info(&intf
->dev
, "Alphatrack Surface #%d now disconnected\n",
816 (minor
- USB_ALPHATRACK_MINOR_BASE
));
819 /* usb specific object needed to register this driver with the usb subsystem */
820 static struct usb_driver usb_alphatrack_driver
= {
821 .name
= "alphatrack",
822 .probe
= usb_alphatrack_probe
,
823 .disconnect
= usb_alphatrack_disconnect
,
824 .id_table
= usb_alphatrack_table
,
828 * usb_alphatrack_init
830 static int __init
usb_alphatrack_init(void)
834 /* register this driver with the USB subsystem */
835 retval
= usb_register(&usb_alphatrack_driver
);
837 err("usb_register failed for the "__FILE__
" driver. Error number %d\n", retval
);
843 * usb_alphatrack_exit
845 static void __exit
usb_alphatrack_exit(void)
847 /* deregister this driver with the USB subsystem */
848 usb_deregister(&usb_alphatrack_driver
);
851 module_init(usb_alphatrack_init
);
852 module_exit(usb_alphatrack_exit
);