2 * Native support for the I/O-Warrior USB devices
4 * Copyright (c) 2003-2005 Code Mercenaries GmbH
5 * written by Christian Lucht <lucht@codemercs.com>
9 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
10 * brlvger.c by Stephane Dalton <sdalton@videotron.ca>
11 * and St�hane Doyon <s.doyon@videotron.ca>
13 * Released under the GPLv2.
16 #include <linux/module.h>
17 #include <linux/usb.h>
18 #include <linux/slab.h>
19 #include <linux/sched.h>
20 #include <linux/mutex.h>
21 #include <linux/poll.h>
22 #include <linux/usb/iowarrior.h>
24 /* Version Information */
25 #define DRIVER_VERSION "v0.4.0"
26 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
27 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)"
29 #define USB_VENDOR_ID_CODEMERCS 1984
30 /* low speed iowarrior */
31 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
32 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
33 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
34 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
35 /* full speed iowarrior */
36 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
38 /* Get a minor range for your devices from the usb maintainer */
39 #ifdef CONFIG_USB_DYNAMIC_MINORS
40 #define IOWARRIOR_MINOR_BASE 0
42 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
45 /* interrupt input queue size */
46 #define MAX_INTERRUPT_BUFFER 16
48 maximum number of urbs that are submitted for writes at the same time,
49 this applies to the IOWarrior56 only!
50 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
52 #define MAX_WRITES_IN_FLIGHT 4
54 MODULE_AUTHOR(DRIVER_AUTHOR);
55 MODULE_DESCRIPTION(DRIVER_DESC);
56 MODULE_LICENSE("GPL");
58 /* Module parameters */
59 static DEFINE_MUTEX(iowarrior_mutex);
61 static struct usb_driver iowarrior_driver;
62 static DEFINE_MUTEX(iowarrior_open_disc_lock);
68 /* Structure to hold all of our device specific stuff */
70 struct mutex mutex; /* locks this structure */
71 struct usb_device *udev; /* save off the usb device pointer */
72 struct usb_interface *interface; /* the interface for this device */
73 unsigned char minor; /* the starting minor number for this device */
74 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
75 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
76 struct urb *int_in_urb; /* the urb for reading data */
77 unsigned char *int_in_buffer; /* buffer for data to be read */
78 unsigned char serial_number; /* to detect lost packages */
79 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
80 wait_queue_head_t read_wait;
81 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
82 atomic_t write_busy; /* number of write-urbs submitted */
85 spinlock_t intr_idx_lock; /* protects intr_idx */
86 atomic_t overflow_flag; /* signals an index 'rollover' */
87 int present; /* this is 1 as long as the device is connected */
88 int opened; /* this is 1 if the device is currently open */
89 char chip_serial[9]; /* the serial number string of the chip connected */
90 int report_size; /* number of bytes in a report */
92 struct usb_anchor submitted;
99 #define USB_REQ_GET_REPORT 0x01
101 static int usb_get_report(struct usb_device *dev,
102 struct usb_host_interface *inter, unsigned char type,
103 unsigned char id, void *buf, int size)
105 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
107 USB_DIR_IN | USB_TYPE_CLASS |
108 USB_RECIP_INTERFACE, (type << 8) + id,
109 inter->desc.bInterfaceNumber, buf, size,
110 USB_CTRL_GET_TIMEOUT);
114 #define USB_REQ_SET_REPORT 0x09
116 static int usb_set_report(struct usb_interface *intf, unsigned char type,
117 unsigned char id, void *buf, int size)
119 return usb_control_msg(interface_to_usbdev(intf),
120 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
122 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
124 intf->cur_altsetting->desc.bInterfaceNumber, buf,
128 /*---------------------*/
129 /* driver registration */
130 /*---------------------*/
131 /* table of devices that work with this driver */
132 static const struct usb_device_id iowarrior_ids[] = {
133 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
134 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
135 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
136 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
137 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
138 {} /* Terminating entry */
140 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
143 * USB callback handler for reading data
145 static void iowarrior_callback(struct urb *urb)
147 struct iowarrior *dev = urb->context;
152 int status = urb->status;
167 spin_lock(&dev->intr_idx_lock);
168 intr_idx = atomic_read(&dev->intr_idx);
169 /* aux_idx become previous intr_idx */
170 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
171 read_idx = atomic_read(&dev->read_idx);
173 /* queue is not empty and it's interface 0 */
174 if ((intr_idx != read_idx)
175 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
176 /* + 1 for serial number */
177 offset = aux_idx * (dev->report_size + 1);
179 (dev->read_queue + offset, urb->transfer_buffer,
181 /* equal values on interface 0 will be ignored */
182 spin_unlock(&dev->intr_idx_lock);
187 /* aux_idx become next intr_idx */
188 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
189 if (read_idx == aux_idx) {
190 /* queue full, dropping oldest input */
191 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
192 atomic_set(&dev->read_idx, read_idx);
193 atomic_set(&dev->overflow_flag, 1);
196 /* +1 for serial number */
197 offset = intr_idx * (dev->report_size + 1);
198 memcpy(dev->read_queue + offset, urb->transfer_buffer,
200 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
202 atomic_set(&dev->intr_idx, aux_idx);
203 spin_unlock(&dev->intr_idx_lock);
204 /* tell the blocking read about the new data */
205 wake_up_interruptible(&dev->read_wait);
208 retval = usb_submit_urb(urb, GFP_ATOMIC);
210 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
216 * USB Callback handler for write-ops
218 static void iowarrior_write_callback(struct urb *urb)
220 struct iowarrior *dev;
221 int status = urb->status;
224 /* sync/async unlink faults aren't errors */
226 !(status == -ENOENT ||
227 status == -ECONNRESET || status == -ESHUTDOWN)) {
228 dev_dbg(&dev->interface->dev,
229 "nonzero write bulk status received: %d\n", status);
231 /* free up our allocated buffer */
232 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
233 urb->transfer_buffer, urb->transfer_dma);
234 /* tell a waiting writer the interrupt-out-pipe is available again */
235 atomic_dec(&dev->write_busy);
236 wake_up_interruptible(&dev->write_wait);
242 static inline void iowarrior_delete(struct iowarrior *dev)
244 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
245 kfree(dev->int_in_buffer);
246 usb_free_urb(dev->int_in_urb);
247 kfree(dev->read_queue);
248 usb_put_intf(dev->interface);
252 /*---------------------*/
253 /* fops implementation */
254 /*---------------------*/
256 static int read_index(struct iowarrior *dev)
258 int intr_idx, read_idx;
260 read_idx = atomic_read(&dev->read_idx);
261 intr_idx = atomic_read(&dev->intr_idx);
263 return (read_idx == intr_idx ? -1 : read_idx);
269 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
270 size_t count, loff_t *ppos)
272 struct iowarrior *dev;
276 dev = file->private_data;
278 /* verify that the device wasn't unplugged */
279 if (!dev || !dev->present)
282 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
285 /* read count must be packet size (+ time stamp) */
286 if ((count != dev->report_size)
287 && (count != (dev->report_size + 1)))
290 /* repeat until no buffer overrun in callback handler occur */
292 atomic_set(&dev->overflow_flag, 0);
293 if ((read_idx = read_index(dev)) == -1) {
295 if (file->f_flags & O_NONBLOCK)
298 //next line will return when there is either new data, or the device is unplugged
299 int r = wait_event_interruptible(dev->read_wait,
306 //we were interrupted by a signal
310 //The device was unplugged
313 if (read_idx == -1) {
314 // Can this happen ???
320 offset = read_idx * (dev->report_size + 1);
321 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
324 } while (atomic_read(&dev->overflow_flag));
326 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
327 atomic_set(&dev->read_idx, read_idx);
334 static ssize_t iowarrior_write(struct file *file,
335 const char __user *user_buffer,
336 size_t count, loff_t *ppos)
338 struct iowarrior *dev;
340 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
341 struct urb *int_out_urb = NULL;
343 dev = file->private_data;
345 mutex_lock(&dev->mutex);
346 /* verify that the device wasn't unplugged */
351 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
353 /* if count is 0 we're already done */
358 /* We only accept full reports */
359 if (count != dev->report_size) {
363 switch (dev->product_id) {
364 case USB_DEVICE_ID_CODEMERCS_IOW24:
365 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
366 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
367 case USB_DEVICE_ID_CODEMERCS_IOW40:
368 /* IOW24 and IOW40 use a synchronous call */
369 buf = kmalloc(count, GFP_KERNEL);
374 if (copy_from_user(buf, user_buffer, count)) {
379 retval = usb_set_report(dev->interface, 2, 0, buf, count);
383 case USB_DEVICE_ID_CODEMERCS_IOW56:
384 /* The IOW56 uses asynchronous IO and more urbs */
385 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
386 /* Wait until we are below the limit for submitted urbs */
387 if (file->f_flags & O_NONBLOCK) {
391 retval = wait_event_interruptible(dev->write_wait,
392 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
394 /* we were interrupted by a signal */
399 /* The device was unplugged */
404 /* We were closed while waiting for an URB */
410 atomic_inc(&dev->write_busy);
411 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
416 buf = usb_alloc_coherent(dev->udev, dev->report_size,
417 GFP_KERNEL, &int_out_urb->transfer_dma);
420 dev_dbg(&dev->interface->dev,
421 "Unable to allocate buffer\n");
422 goto error_no_buffer;
424 usb_fill_int_urb(int_out_urb, dev->udev,
425 usb_sndintpipe(dev->udev,
426 dev->int_out_endpoint->bEndpointAddress),
427 buf, dev->report_size,
428 iowarrior_write_callback, dev,
429 dev->int_out_endpoint->bInterval);
430 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
431 if (copy_from_user(buf, user_buffer, count)) {
435 usb_anchor_urb(int_out_urb, &dev->submitted);
436 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
438 dev_dbg(&dev->interface->dev,
439 "submit error %d for urb nr.%d\n",
440 retval, atomic_read(&dev->write_busy));
441 usb_unanchor_urb(int_out_urb);
446 usb_free_urb(int_out_urb);
450 /* what do we have here ? An unsupported Product-ID ? */
451 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
452 __func__, dev->product_id);
458 usb_free_coherent(dev->udev, dev->report_size, buf,
459 int_out_urb->transfer_dma);
461 usb_free_urb(int_out_urb);
463 atomic_dec(&dev->write_busy);
464 wake_up_interruptible(&dev->write_wait);
466 mutex_unlock(&dev->mutex);
473 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
476 struct iowarrior *dev = NULL;
478 __u8 __user *user_buffer;
480 int io_res; /* checks for bytes read/written and copy_to/from_user results */
482 dev = file->private_data;
486 buffer = kzalloc(dev->report_size, GFP_KERNEL);
490 /* lock this object */
491 mutex_lock(&iowarrior_mutex);
492 mutex_lock(&dev->mutex);
494 /* verify that the device wasn't unplugged */
500 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
501 dev->minor, cmd, arg);
507 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
508 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
509 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
510 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
511 user_buffer = (__u8 __user *)arg;
512 io_res = copy_from_user(buffer, user_buffer,
517 io_res = usb_set_report(dev->interface, 2, 0,
525 dev_err(&dev->interface->dev,
526 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
531 user_buffer = (__u8 __user *)arg;
532 io_res = usb_get_report(dev->udev,
533 dev->interface->cur_altsetting, 1, 0,
534 buffer, dev->report_size);
538 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
545 /* Report available information for the device */
546 struct iowarrior_info info;
547 /* needed for power consumption */
548 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
550 memset(&info, 0, sizeof(info));
551 /* directly from the descriptor */
552 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
553 info.product = dev->product_id;
554 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
556 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
557 info.speed = dev->udev->speed;
558 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
559 info.report_size = dev->report_size;
561 /* serial number string has been read earlier 8 chars or empty string */
562 memcpy(info.serial, dev->chip_serial,
563 sizeof(dev->chip_serial));
564 if (cfg_descriptor == NULL) {
565 info.power = -1; /* no information available */
567 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
568 info.power = cfg_descriptor->bMaxPower * 2;
570 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
571 sizeof(struct iowarrior_info));
577 /* return that we did not understand this ioctl call */
582 /* unlock the device */
583 mutex_unlock(&dev->mutex);
584 mutex_unlock(&iowarrior_mutex);
592 static int iowarrior_open(struct inode *inode, struct file *file)
594 struct iowarrior *dev = NULL;
595 struct usb_interface *interface;
599 mutex_lock(&iowarrior_mutex);
600 subminor = iminor(inode);
602 interface = usb_find_interface(&iowarrior_driver, subminor);
604 mutex_unlock(&iowarrior_mutex);
605 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
610 mutex_lock(&iowarrior_open_disc_lock);
611 dev = usb_get_intfdata(interface);
613 mutex_unlock(&iowarrior_open_disc_lock);
614 mutex_unlock(&iowarrior_mutex);
618 mutex_lock(&dev->mutex);
619 mutex_unlock(&iowarrior_open_disc_lock);
621 /* Only one process can open each device, no sharing. */
627 /* setup interrupt handler for receiving values */
628 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
629 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
633 /* increment our usage count for the driver */
635 /* save our object in the file's private structure */
636 file->private_data = dev;
640 mutex_unlock(&dev->mutex);
641 mutex_unlock(&iowarrior_mutex);
648 static int iowarrior_release(struct inode *inode, struct file *file)
650 struct iowarrior *dev;
653 dev = file->private_data;
657 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
659 /* lock our device */
660 mutex_lock(&dev->mutex);
662 if (dev->opened <= 0) {
663 retval = -ENODEV; /* close called more than once */
664 mutex_unlock(&dev->mutex);
666 dev->opened = 0; /* we're closing now */
670 The device is still connected so we only shutdown
671 pending read-/write-ops.
673 usb_kill_urb(dev->int_in_urb);
674 wake_up_interruptible(&dev->read_wait);
675 wake_up_interruptible(&dev->write_wait);
676 mutex_unlock(&dev->mutex);
678 /* The device was unplugged, cleanup resources */
679 mutex_unlock(&dev->mutex);
680 iowarrior_delete(dev);
686 static unsigned iowarrior_poll(struct file *file, poll_table * wait)
688 struct iowarrior *dev = file->private_data;
689 unsigned int mask = 0;
692 return POLLERR | POLLHUP;
694 poll_wait(file, &dev->read_wait, wait);
695 poll_wait(file, &dev->write_wait, wait);
698 return POLLERR | POLLHUP;
700 if (read_index(dev) != -1)
701 mask |= POLLIN | POLLRDNORM;
703 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
704 mask |= POLLOUT | POLLWRNORM;
709 * File operations needed when we register this driver.
710 * This assumes that this driver NEEDS file operations,
711 * of course, which means that the driver is expected
712 * to have a node in the /dev directory. If the USB
713 * device were for a network interface then the driver
714 * would use "struct net_driver" instead, and a serial
715 * device would use "struct tty_driver".
717 static const struct file_operations iowarrior_fops = {
718 .owner = THIS_MODULE,
719 .write = iowarrior_write,
720 .read = iowarrior_read,
721 .unlocked_ioctl = iowarrior_ioctl,
722 .open = iowarrior_open,
723 .release = iowarrior_release,
724 .poll = iowarrior_poll,
725 .llseek = noop_llseek,
728 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
730 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
734 * usb class driver info in order to get a minor number from the usb core,
735 * and to have the device registered with devfs and the driver core
737 static struct usb_class_driver iowarrior_class = {
738 .name = "iowarrior%d",
739 .devnode = iowarrior_devnode,
740 .fops = &iowarrior_fops,
741 .minor_base = IOWARRIOR_MINOR_BASE,
744 /*---------------------------------*/
745 /* probe and disconnect functions */
746 /*---------------------------------*/
750 * Called by the usb core when a new device is connected that it thinks
751 * this driver might be interested in.
753 static int iowarrior_probe(struct usb_interface *interface,
754 const struct usb_device_id *id)
756 struct usb_device *udev = interface_to_usbdev(interface);
757 struct iowarrior *dev = NULL;
758 struct usb_host_interface *iface_desc;
759 struct usb_endpoint_descriptor *endpoint;
761 int retval = -ENOMEM;
763 /* allocate memory for our device state and initialize it */
764 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
768 mutex_init(&dev->mutex);
770 atomic_set(&dev->intr_idx, 0);
771 atomic_set(&dev->read_idx, 0);
772 spin_lock_init(&dev->intr_idx_lock);
773 atomic_set(&dev->overflow_flag, 0);
774 init_waitqueue_head(&dev->read_wait);
775 atomic_set(&dev->write_busy, 0);
776 init_waitqueue_head(&dev->write_wait);
779 dev->interface = usb_get_intf(interface);
781 iface_desc = interface->cur_altsetting;
782 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
784 init_usb_anchor(&dev->submitted);
786 /* set up the endpoint information */
787 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
788 endpoint = &iface_desc->endpoint[i].desc;
790 if (usb_endpoint_is_int_in(endpoint))
791 dev->int_in_endpoint = endpoint;
792 if (usb_endpoint_is_int_out(endpoint))
793 /* this one will match for the IOWarrior56 only */
794 dev->int_out_endpoint = endpoint;
797 if (!dev->int_in_endpoint) {
798 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
803 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
804 if (!dev->int_out_endpoint) {
805 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
811 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
812 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
813 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
814 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
815 /* IOWarrior56 has wMaxPacketSize different from report size */
816 dev->report_size = 7;
818 /* create the urb and buffer for reading */
819 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
820 if (!dev->int_in_urb)
822 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
823 if (!dev->int_in_buffer)
825 usb_fill_int_urb(dev->int_in_urb, dev->udev,
826 usb_rcvintpipe(dev->udev,
827 dev->int_in_endpoint->bEndpointAddress),
828 dev->int_in_buffer, dev->report_size,
829 iowarrior_callback, dev,
830 dev->int_in_endpoint->bInterval);
831 /* create an internal buffer for interrupt data from the device */
833 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
835 if (!dev->read_queue)
837 /* Get the serial-number of the chip */
838 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
839 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
840 sizeof(dev->chip_serial));
841 if (strlen(dev->chip_serial) != 8)
842 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
844 /* Set the idle timeout to 0, if this is interface 0 */
845 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
846 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
848 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
849 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
851 /* allow device read and ioctl */
854 /* we can register the device now, as it is ready */
855 usb_set_intfdata(interface, dev);
857 retval = usb_register_dev(interface, &iowarrior_class);
859 /* something prevented us from registering this driver */
860 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
861 usb_set_intfdata(interface, NULL);
865 dev->minor = interface->minor;
867 /* let the user know what node this device is now attached to */
868 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
869 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
870 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
874 iowarrior_delete(dev);
879 * iowarrior_disconnect
881 * Called by the usb core when the device is removed from the system.
883 static void iowarrior_disconnect(struct usb_interface *interface)
885 struct iowarrior *dev;
888 dev = usb_get_intfdata(interface);
889 mutex_lock(&iowarrior_open_disc_lock);
890 usb_set_intfdata(interface, NULL);
893 mutex_unlock(&iowarrior_open_disc_lock);
894 /* give back our minor - this will call close() locks need to be dropped at this point*/
896 usb_deregister_dev(interface, &iowarrior_class);
898 mutex_lock(&dev->mutex);
900 /* prevent device read, write and ioctl */
904 /* There is a process that holds a filedescriptor to the device ,
905 so we only shutdown read-/write-ops going on.
906 Deleting the device is postponed until close() was called.
908 usb_kill_urb(dev->int_in_urb);
909 usb_kill_anchored_urbs(&dev->submitted);
910 wake_up_interruptible(&dev->read_wait);
911 wake_up_interruptible(&dev->write_wait);
912 mutex_unlock(&dev->mutex);
914 /* no process is using the device, cleanup now */
915 mutex_unlock(&dev->mutex);
916 iowarrior_delete(dev);
919 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
920 minor - IOWARRIOR_MINOR_BASE);
923 /* usb specific object needed to register this driver with the usb subsystem */
924 static struct usb_driver iowarrior_driver = {
926 .probe = iowarrior_probe,
927 .disconnect = iowarrior_disconnect,
928 .id_table = iowarrior_ids,
931 module_usb_driver(iowarrior_driver);