1 // SPDX-License-Identifier: GPL-2.0
3 * Native support for the I/O-Warrior USB devices
5 * Copyright (c) 2003-2005 Code Mercenaries GmbH
6 * written by Christian Lucht <lucht@codemercs.com>
10 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
11 * brlvger.c by Stephane Dalton <sdalton@videotron.ca>
12 * and St�hane Doyon <s.doyon@videotron.ca>
14 * Released under the GPLv2.
17 #include <linux/module.h>
18 #include <linux/usb.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/mutex.h>
22 #include <linux/poll.h>
23 #include <linux/usb/iowarrior.h>
25 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
26 #define DRIVER_DESC "USB IO-Warrior driver"
28 #define USB_VENDOR_ID_CODEMERCS 1984
29 /* low speed iowarrior */
30 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
31 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
32 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
33 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
34 /* full speed iowarrior */
35 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
37 /* Get a minor range for your devices from the usb maintainer */
38 #ifdef CONFIG_USB_DYNAMIC_MINORS
39 #define IOWARRIOR_MINOR_BASE 0
41 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
44 /* interrupt input queue size */
45 #define MAX_INTERRUPT_BUFFER 16
47 maximum number of urbs that are submitted for writes at the same time,
48 this applies to the IOWarrior56 only!
49 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
51 #define MAX_WRITES_IN_FLIGHT 4
53 MODULE_AUTHOR(DRIVER_AUTHOR);
54 MODULE_DESCRIPTION(DRIVER_DESC);
55 MODULE_LICENSE("GPL");
57 static struct usb_driver iowarrior_driver;
63 /* Structure to hold all of our device specific stuff */
65 struct mutex mutex; /* locks this structure */
66 struct usb_device *udev; /* save off the usb device pointer */
67 struct usb_interface *interface; /* the interface for this device */
68 unsigned char minor; /* the starting minor number for this device */
69 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
70 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
71 struct urb *int_in_urb; /* the urb for reading data */
72 unsigned char *int_in_buffer; /* buffer for data to be read */
73 unsigned char serial_number; /* to detect lost packages */
74 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
75 wait_queue_head_t read_wait;
76 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
77 atomic_t write_busy; /* number of write-urbs submitted */
80 atomic_t overflow_flag; /* signals an index 'rollover' */
81 int present; /* this is 1 as long as the device is connected */
82 int opened; /* this is 1 if the device is currently open */
83 char chip_serial[9]; /* the serial number string of the chip connected */
84 int report_size; /* number of bytes in a report */
86 struct usb_anchor submitted;
94 * USB spec identifies 5 second timeouts.
97 #define USB_REQ_GET_REPORT 0x01
99 static int usb_get_report(struct usb_device *dev,
100 struct usb_host_interface *inter, unsigned char type,
101 unsigned char id, void *buf, int size)
103 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
105 USB_DIR_IN | USB_TYPE_CLASS |
106 USB_RECIP_INTERFACE, (type << 8) + id,
107 inter->desc.bInterfaceNumber, buf, size,
112 #define USB_REQ_SET_REPORT 0x09
114 static int usb_set_report(struct usb_interface *intf, unsigned char type,
115 unsigned char id, void *buf, int size)
117 return usb_control_msg(interface_to_usbdev(intf),
118 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
120 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
122 intf->cur_altsetting->desc.bInterfaceNumber, buf,
126 /*---------------------*/
127 /* driver registration */
128 /*---------------------*/
129 /* table of devices that work with this driver */
130 static const struct usb_device_id iowarrior_ids[] = {
131 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
132 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
133 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
134 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
135 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
136 {} /* Terminating entry */
138 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
141 * USB callback handler for reading data
143 static void iowarrior_callback(struct urb *urb)
145 struct iowarrior *dev = urb->context;
150 int status = urb->status;
165 intr_idx = atomic_read(&dev->intr_idx);
166 /* aux_idx become previous intr_idx */
167 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
168 read_idx = atomic_read(&dev->read_idx);
170 /* queue is not empty and it's interface 0 */
171 if ((intr_idx != read_idx)
172 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
173 /* + 1 for serial number */
174 offset = aux_idx * (dev->report_size + 1);
176 (dev->read_queue + offset, urb->transfer_buffer,
178 /* equal values on interface 0 will be ignored */
183 /* aux_idx become next intr_idx */
184 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
185 if (read_idx == aux_idx) {
186 /* queue full, dropping oldest input */
187 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
188 atomic_set(&dev->read_idx, read_idx);
189 atomic_set(&dev->overflow_flag, 1);
192 /* +1 for serial number */
193 offset = intr_idx * (dev->report_size + 1);
194 memcpy(dev->read_queue + offset, urb->transfer_buffer,
196 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
198 atomic_set(&dev->intr_idx, aux_idx);
199 /* tell the blocking read about the new data */
200 wake_up_interruptible(&dev->read_wait);
203 retval = usb_submit_urb(urb, GFP_ATOMIC);
205 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
211 * USB Callback handler for write-ops
213 static void iowarrior_write_callback(struct urb *urb)
215 struct iowarrior *dev;
216 int status = urb->status;
219 /* sync/async unlink faults aren't errors */
221 !(status == -ENOENT ||
222 status == -ECONNRESET || status == -ESHUTDOWN)) {
223 dev_dbg(&dev->interface->dev,
224 "nonzero write bulk status received: %d\n", status);
226 /* free up our allocated buffer */
227 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
228 urb->transfer_buffer, urb->transfer_dma);
229 /* tell a waiting writer the interrupt-out-pipe is available again */
230 atomic_dec(&dev->write_busy);
231 wake_up_interruptible(&dev->write_wait);
237 static inline void iowarrior_delete(struct iowarrior *dev)
239 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
240 kfree(dev->int_in_buffer);
241 usb_free_urb(dev->int_in_urb);
242 kfree(dev->read_queue);
243 usb_put_intf(dev->interface);
247 /*---------------------*/
248 /* fops implementation */
249 /*---------------------*/
251 static int read_index(struct iowarrior *dev)
253 int intr_idx, read_idx;
255 read_idx = atomic_read(&dev->read_idx);
256 intr_idx = atomic_read(&dev->intr_idx);
258 return (read_idx == intr_idx ? -1 : read_idx);
264 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
265 size_t count, loff_t *ppos)
267 struct iowarrior *dev;
271 dev = file->private_data;
273 /* verify that the device wasn't unplugged */
274 if (!dev || !dev->present)
277 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
280 /* read count must be packet size (+ time stamp) */
281 if ((count != dev->report_size)
282 && (count != (dev->report_size + 1)))
285 /* repeat until no buffer overrun in callback handler occur */
287 atomic_set(&dev->overflow_flag, 0);
288 if ((read_idx = read_index(dev)) == -1) {
290 if (file->f_flags & O_NONBLOCK)
293 //next line will return when there is either new data, or the device is unplugged
294 int r = wait_event_interruptible(dev->read_wait,
301 //we were interrupted by a signal
305 //The device was unplugged
308 if (read_idx == -1) {
309 // Can this happen ???
315 offset = read_idx * (dev->report_size + 1);
316 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
319 } while (atomic_read(&dev->overflow_flag));
321 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
322 atomic_set(&dev->read_idx, read_idx);
329 static ssize_t iowarrior_write(struct file *file,
330 const char __user *user_buffer,
331 size_t count, loff_t *ppos)
333 struct iowarrior *dev;
335 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
336 struct urb *int_out_urb = NULL;
338 dev = file->private_data;
340 mutex_lock(&dev->mutex);
341 /* verify that the device wasn't unplugged */
346 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
348 /* if count is 0 we're already done */
353 /* We only accept full reports */
354 if (count != dev->report_size) {
358 switch (dev->product_id) {
359 case USB_DEVICE_ID_CODEMERCS_IOW24:
360 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
361 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
362 case USB_DEVICE_ID_CODEMERCS_IOW40:
363 /* IOW24 and IOW40 use a synchronous call */
364 buf = memdup_user(user_buffer, count);
366 retval = PTR_ERR(buf);
369 retval = usb_set_report(dev->interface, 2, 0, buf, count);
373 case USB_DEVICE_ID_CODEMERCS_IOW56:
374 /* The IOW56 uses asynchronous IO and more urbs */
375 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
376 /* Wait until we are below the limit for submitted urbs */
377 if (file->f_flags & O_NONBLOCK) {
381 retval = wait_event_interruptible(dev->write_wait,
382 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
384 /* we were interrupted by a signal */
389 /* The device was unplugged */
394 /* We were closed while waiting for an URB */
400 atomic_inc(&dev->write_busy);
401 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
406 buf = usb_alloc_coherent(dev->udev, dev->report_size,
407 GFP_KERNEL, &int_out_urb->transfer_dma);
410 dev_dbg(&dev->interface->dev,
411 "Unable to allocate buffer\n");
412 goto error_no_buffer;
414 usb_fill_int_urb(int_out_urb, dev->udev,
415 usb_sndintpipe(dev->udev,
416 dev->int_out_endpoint->bEndpointAddress),
417 buf, dev->report_size,
418 iowarrior_write_callback, dev,
419 dev->int_out_endpoint->bInterval);
420 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
421 if (copy_from_user(buf, user_buffer, count)) {
425 usb_anchor_urb(int_out_urb, &dev->submitted);
426 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
428 dev_dbg(&dev->interface->dev,
429 "submit error %d for urb nr.%d\n",
430 retval, atomic_read(&dev->write_busy));
431 usb_unanchor_urb(int_out_urb);
436 usb_free_urb(int_out_urb);
440 /* what do we have here ? An unsupported Product-ID ? */
441 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
442 __func__, dev->product_id);
448 usb_free_coherent(dev->udev, dev->report_size, buf,
449 int_out_urb->transfer_dma);
451 usb_free_urb(int_out_urb);
453 atomic_dec(&dev->write_busy);
454 wake_up_interruptible(&dev->write_wait);
456 mutex_unlock(&dev->mutex);
463 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
466 struct iowarrior *dev = NULL;
468 __u8 __user *user_buffer;
470 int io_res; /* checks for bytes read/written and copy_to/from_user results */
472 dev = file->private_data;
476 buffer = kzalloc(dev->report_size, GFP_KERNEL);
480 mutex_lock(&dev->mutex);
482 /* verify that the device wasn't unplugged */
488 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
489 dev->minor, cmd, arg);
495 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
496 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
497 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
498 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
499 user_buffer = (__u8 __user *)arg;
500 io_res = copy_from_user(buffer, user_buffer,
505 io_res = usb_set_report(dev->interface, 2, 0,
513 dev_err(&dev->interface->dev,
514 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
519 user_buffer = (__u8 __user *)arg;
520 io_res = usb_get_report(dev->udev,
521 dev->interface->cur_altsetting, 1, 0,
522 buffer, dev->report_size);
526 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
533 /* Report available information for the device */
534 struct iowarrior_info info;
535 /* needed for power consumption */
536 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
538 memset(&info, 0, sizeof(info));
539 /* directly from the descriptor */
540 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
541 info.product = dev->product_id;
542 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
544 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
545 info.speed = dev->udev->speed;
546 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
547 info.report_size = dev->report_size;
549 /* serial number string has been read earlier 8 chars or empty string */
550 memcpy(info.serial, dev->chip_serial,
551 sizeof(dev->chip_serial));
552 if (cfg_descriptor == NULL) {
553 info.power = -1; /* no information available */
555 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
556 info.power = cfg_descriptor->bMaxPower * 2;
558 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
559 sizeof(struct iowarrior_info));
565 /* return that we did not understand this ioctl call */
570 /* unlock the device */
571 mutex_unlock(&dev->mutex);
579 static int iowarrior_open(struct inode *inode, struct file *file)
581 struct iowarrior *dev = NULL;
582 struct usb_interface *interface;
586 subminor = iminor(inode);
588 interface = usb_find_interface(&iowarrior_driver, subminor);
590 pr_err("%s - error, can't find device for minor %d\n",
595 dev = usb_get_intfdata(interface);
599 mutex_lock(&dev->mutex);
601 /* Only one process can open each device, no sharing. */
607 /* setup interrupt handler for receiving values */
608 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
609 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
613 /* increment our usage count for the driver */
615 /* save our object in the file's private structure */
616 file->private_data = dev;
620 mutex_unlock(&dev->mutex);
627 static int iowarrior_release(struct inode *inode, struct file *file)
629 struct iowarrior *dev;
632 dev = file->private_data;
636 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
638 /* lock our device */
639 mutex_lock(&dev->mutex);
641 if (dev->opened <= 0) {
642 retval = -ENODEV; /* close called more than once */
643 mutex_unlock(&dev->mutex);
645 dev->opened = 0; /* we're closing now */
649 The device is still connected so we only shutdown
650 pending read-/write-ops.
652 usb_kill_urb(dev->int_in_urb);
653 wake_up_interruptible(&dev->read_wait);
654 wake_up_interruptible(&dev->write_wait);
655 mutex_unlock(&dev->mutex);
657 /* The device was unplugged, cleanup resources */
658 mutex_unlock(&dev->mutex);
659 iowarrior_delete(dev);
665 static __poll_t iowarrior_poll(struct file *file, poll_table * wait)
667 struct iowarrior *dev = file->private_data;
671 return EPOLLERR | EPOLLHUP;
673 poll_wait(file, &dev->read_wait, wait);
674 poll_wait(file, &dev->write_wait, wait);
677 return EPOLLERR | EPOLLHUP;
679 if (read_index(dev) != -1)
680 mask |= EPOLLIN | EPOLLRDNORM;
682 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
683 mask |= EPOLLOUT | EPOLLWRNORM;
688 * File operations needed when we register this driver.
689 * This assumes that this driver NEEDS file operations,
690 * of course, which means that the driver is expected
691 * to have a node in the /dev directory. If the USB
692 * device were for a network interface then the driver
693 * would use "struct net_driver" instead, and a serial
694 * device would use "struct tty_driver".
696 static const struct file_operations iowarrior_fops = {
697 .owner = THIS_MODULE,
698 .write = iowarrior_write,
699 .read = iowarrior_read,
700 .unlocked_ioctl = iowarrior_ioctl,
701 .open = iowarrior_open,
702 .release = iowarrior_release,
703 .poll = iowarrior_poll,
704 .llseek = noop_llseek,
707 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
709 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
713 * usb class driver info in order to get a minor number from the usb core,
714 * and to have the device registered with devfs and the driver core
716 static struct usb_class_driver iowarrior_class = {
717 .name = "iowarrior%d",
718 .devnode = iowarrior_devnode,
719 .fops = &iowarrior_fops,
720 .minor_base = IOWARRIOR_MINOR_BASE,
723 /*---------------------------------*/
724 /* probe and disconnect functions */
725 /*---------------------------------*/
729 * Called by the usb core when a new device is connected that it thinks
730 * this driver might be interested in.
732 static int iowarrior_probe(struct usb_interface *interface,
733 const struct usb_device_id *id)
735 struct usb_device *udev = interface_to_usbdev(interface);
736 struct iowarrior *dev = NULL;
737 struct usb_host_interface *iface_desc;
738 int retval = -ENOMEM;
741 /* allocate memory for our device state and initialize it */
742 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
746 mutex_init(&dev->mutex);
748 atomic_set(&dev->intr_idx, 0);
749 atomic_set(&dev->read_idx, 0);
750 atomic_set(&dev->overflow_flag, 0);
751 init_waitqueue_head(&dev->read_wait);
752 atomic_set(&dev->write_busy, 0);
753 init_waitqueue_head(&dev->write_wait);
756 dev->interface = usb_get_intf(interface);
758 iface_desc = interface->cur_altsetting;
759 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
761 init_usb_anchor(&dev->submitted);
763 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint);
765 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
770 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
771 res = usb_find_last_int_out_endpoint(iface_desc,
772 &dev->int_out_endpoint);
774 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
780 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
781 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
782 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
783 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
784 /* IOWarrior56 has wMaxPacketSize different from report size */
785 dev->report_size = 7;
787 /* create the urb and buffer for reading */
788 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
789 if (!dev->int_in_urb)
791 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
792 if (!dev->int_in_buffer)
794 usb_fill_int_urb(dev->int_in_urb, dev->udev,
795 usb_rcvintpipe(dev->udev,
796 dev->int_in_endpoint->bEndpointAddress),
797 dev->int_in_buffer, dev->report_size,
798 iowarrior_callback, dev,
799 dev->int_in_endpoint->bInterval);
800 /* create an internal buffer for interrupt data from the device */
802 kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
804 if (!dev->read_queue)
806 /* Get the serial-number of the chip */
807 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
808 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
809 sizeof(dev->chip_serial));
810 if (strlen(dev->chip_serial) != 8)
811 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
813 /* Set the idle timeout to 0, if this is interface 0 */
814 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
815 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
817 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
818 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
820 /* allow device read and ioctl */
823 /* we can register the device now, as it is ready */
824 usb_set_intfdata(interface, dev);
826 retval = usb_register_dev(interface, &iowarrior_class);
828 /* something prevented us from registering this driver */
829 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
833 dev->minor = interface->minor;
835 /* let the user know what node this device is now attached to */
836 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
837 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
838 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
842 iowarrior_delete(dev);
847 * iowarrior_disconnect
849 * Called by the usb core when the device is removed from the system.
851 static void iowarrior_disconnect(struct usb_interface *interface)
853 struct iowarrior *dev = usb_get_intfdata(interface);
854 int minor = dev->minor;
856 usb_deregister_dev(interface, &iowarrior_class);
858 mutex_lock(&dev->mutex);
860 /* prevent device read, write and ioctl */
864 /* There is a process that holds a filedescriptor to the device ,
865 so we only shutdown read-/write-ops going on.
866 Deleting the device is postponed until close() was called.
868 usb_kill_urb(dev->int_in_urb);
869 usb_kill_anchored_urbs(&dev->submitted);
870 wake_up_interruptible(&dev->read_wait);
871 wake_up_interruptible(&dev->write_wait);
872 mutex_unlock(&dev->mutex);
874 /* no process is using the device, cleanup now */
875 mutex_unlock(&dev->mutex);
876 iowarrior_delete(dev);
879 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
880 minor - IOWARRIOR_MINOR_BASE);
883 /* usb specific object needed to register this driver with the usb subsystem */
884 static struct usb_driver iowarrior_driver = {
886 .probe = iowarrior_probe,
887 .disconnect = iowarrior_disconnect,
888 .id_table = iowarrior_ids,
891 module_usb_driver(iowarrior_driver);