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/init.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 /* Version Information */
26 #define DRIVER_VERSION "v0.4.0"
27 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
28 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)"
30 #define USB_VENDOR_ID_CODEMERCS 1984
31 /* low speed iowarrior */
32 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
33 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
34 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
35 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
36 /* full speed iowarrior */
37 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
39 /* Get a minor range for your devices from the usb maintainer */
40 #ifdef CONFIG_USB_DYNAMIC_MINORS
41 #define IOWARRIOR_MINOR_BASE 0
43 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not offical yet
46 /* interrupt input queue size */
47 #define MAX_INTERRUPT_BUFFER 16
49 maximum number of urbs that are submitted for writes at the same time,
50 this applies to the IOWarrior56 only!
51 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
53 #define MAX_WRITES_IN_FLIGHT 4
55 /* Use our own dbg macro */
57 #define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 )
59 MODULE_AUTHOR(DRIVER_AUTHOR);
60 MODULE_DESCRIPTION(DRIVER_DESC);
61 MODULE_LICENSE("GPL");
63 /* Module parameters */
64 static DEFINE_MUTEX(iowarrior_mutex);
66 module_param(debug, bool, 0644);
67 MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
69 static struct usb_driver iowarrior_driver;
70 static DEFINE_MUTEX(iowarrior_open_disc_lock);
76 /* Structure to hold all of our device specific stuff */
78 struct mutex mutex; /* locks this structure */
79 struct usb_device *udev; /* save off the usb device pointer */
80 struct usb_interface *interface; /* the interface for this device */
81 unsigned char minor; /* the starting minor number for this device */
82 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
83 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
84 struct urb *int_in_urb; /* the urb for reading data */
85 unsigned char *int_in_buffer; /* buffer for data to be read */
86 unsigned char serial_number; /* to detect lost packages */
87 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
88 wait_queue_head_t read_wait;
89 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
90 atomic_t write_busy; /* number of write-urbs submitted */
93 spinlock_t intr_idx_lock; /* protects intr_idx */
94 atomic_t overflow_flag; /* signals an index 'rollover' */
95 int present; /* this is 1 as long as the device is connected */
96 int opened; /* this is 1 if the device is currently open */
97 char chip_serial[9]; /* the serial number string of the chip connected */
98 int report_size; /* number of bytes in a report */
107 * USB spec identifies 5 second timeouts.
109 #define GET_TIMEOUT 5
110 #define USB_REQ_GET_REPORT 0x01
112 static int usb_get_report(struct usb_device *dev,
113 struct usb_host_interface *inter, unsigned char type,
114 unsigned char id, void *buf, int size)
116 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
118 USB_DIR_IN | USB_TYPE_CLASS |
119 USB_RECIP_INTERFACE, (type << 8) + id,
120 inter->desc.bInterfaceNumber, buf, size,
125 #define USB_REQ_SET_REPORT 0x09
127 static int usb_set_report(struct usb_interface *intf, unsigned char type,
128 unsigned char id, void *buf, int size)
130 return usb_control_msg(interface_to_usbdev(intf),
131 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
133 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
135 intf->cur_altsetting->desc.bInterfaceNumber, buf,
139 /*---------------------*/
140 /* driver registration */
141 /*---------------------*/
142 /* table of devices that work with this driver */
143 static const struct usb_device_id iowarrior_ids[] = {
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
149 {} /* Terminating entry */
151 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
154 * USB callback handler for reading data
156 static void iowarrior_callback(struct urb *urb)
158 struct iowarrior *dev = urb->context;
163 int status = urb->status;
178 spin_lock(&dev->intr_idx_lock);
179 intr_idx = atomic_read(&dev->intr_idx);
180 /* aux_idx become previous intr_idx */
181 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
182 read_idx = atomic_read(&dev->read_idx);
184 /* queue is not empty and it's interface 0 */
185 if ((intr_idx != read_idx)
186 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
187 /* + 1 for serial number */
188 offset = aux_idx * (dev->report_size + 1);
190 (dev->read_queue + offset, urb->transfer_buffer,
192 /* equal values on interface 0 will be ignored */
193 spin_unlock(&dev->intr_idx_lock);
198 /* aux_idx become next intr_idx */
199 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
200 if (read_idx == aux_idx) {
201 /* queue full, dropping oldest input */
202 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
203 atomic_set(&dev->read_idx, read_idx);
204 atomic_set(&dev->overflow_flag, 1);
207 /* +1 for serial number */
208 offset = intr_idx * (dev->report_size + 1);
209 memcpy(dev->read_queue + offset, urb->transfer_buffer,
211 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
213 atomic_set(&dev->intr_idx, aux_idx);
214 spin_unlock(&dev->intr_idx_lock);
215 /* tell the blocking read about the new data */
216 wake_up_interruptible(&dev->read_wait);
219 retval = usb_submit_urb(urb, GFP_ATOMIC);
221 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
227 * USB Callback handler for write-ops
229 static void iowarrior_write_callback(struct urb *urb)
231 struct iowarrior *dev;
232 int status = urb->status;
235 /* sync/async unlink faults aren't errors */
237 !(status == -ENOENT ||
238 status == -ECONNRESET || status == -ESHUTDOWN)) {
239 dbg("%s - nonzero write bulk status received: %d",
242 /* free up our allocated buffer */
243 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
244 urb->transfer_buffer, urb->transfer_dma);
245 /* tell a waiting writer the interrupt-out-pipe is available again */
246 atomic_dec(&dev->write_busy);
247 wake_up_interruptible(&dev->write_wait);
253 static inline void iowarrior_delete(struct iowarrior *dev)
255 dbg("%s - minor %d", __func__, dev->minor);
256 kfree(dev->int_in_buffer);
257 usb_free_urb(dev->int_in_urb);
258 kfree(dev->read_queue);
262 /*---------------------*/
263 /* fops implementation */
264 /*---------------------*/
266 static int read_index(struct iowarrior *dev)
268 int intr_idx, read_idx;
270 read_idx = atomic_read(&dev->read_idx);
271 intr_idx = atomic_read(&dev->intr_idx);
273 return (read_idx == intr_idx ? -1 : read_idx);
279 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
280 size_t count, loff_t *ppos)
282 struct iowarrior *dev;
286 dev = file->private_data;
288 /* verify that the device wasn't unplugged */
289 if (dev == NULL || !dev->present)
292 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
294 /* read count must be packet size (+ time stamp) */
295 if ((count != dev->report_size)
296 && (count != (dev->report_size + 1)))
299 /* repeat until no buffer overrun in callback handler occur */
301 atomic_set(&dev->overflow_flag, 0);
302 if ((read_idx = read_index(dev)) == -1) {
304 if (file->f_flags & O_NONBLOCK)
307 //next line will return when there is either new data, or the device is unplugged
308 int r = wait_event_interruptible(dev->read_wait,
315 //we were interrupted by a signal
319 //The device was unplugged
322 if (read_idx == -1) {
323 // Can this happen ???
329 offset = read_idx * (dev->report_size + 1);
330 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
333 } while (atomic_read(&dev->overflow_flag));
335 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
336 atomic_set(&dev->read_idx, read_idx);
343 static ssize_t iowarrior_write(struct file *file,
344 const char __user *user_buffer,
345 size_t count, loff_t *ppos)
347 struct iowarrior *dev;
349 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
350 struct urb *int_out_urb = NULL;
352 dev = file->private_data;
354 mutex_lock(&dev->mutex);
355 /* verify that the device wasn't unplugged */
360 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
361 /* if count is 0 we're already done */
366 /* We only accept full reports */
367 if (count != dev->report_size) {
371 switch (dev->product_id) {
372 case USB_DEVICE_ID_CODEMERCS_IOW24:
373 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
374 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
375 case USB_DEVICE_ID_CODEMERCS_IOW40:
376 /* IOW24 and IOW40 use a synchronous call */
377 buf = kmalloc(8, GFP_KERNEL); /* 8 bytes are enough for both products */
382 if (copy_from_user(buf, user_buffer, count)) {
387 retval = usb_set_report(dev->interface, 2, 0, buf, count);
391 case USB_DEVICE_ID_CODEMERCS_IOW56:
392 /* The IOW56 uses asynchronous IO and more urbs */
393 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
394 /* Wait until we are below the limit for submitted urbs */
395 if (file->f_flags & O_NONBLOCK) {
399 retval = wait_event_interruptible(dev->write_wait,
400 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
402 /* we were interrupted by a signal */
407 /* The device was unplugged */
412 /* We were closed while waiting for an URB */
418 atomic_inc(&dev->write_busy);
419 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
422 dbg("%s Unable to allocate urb ", __func__);
425 buf = usb_alloc_coherent(dev->udev, dev->report_size,
426 GFP_KERNEL, &int_out_urb->transfer_dma);
429 dbg("%s Unable to allocate buffer ", __func__);
430 goto error_no_buffer;
432 usb_fill_int_urb(int_out_urb, dev->udev,
433 usb_sndintpipe(dev->udev,
434 dev->int_out_endpoint->bEndpointAddress),
435 buf, dev->report_size,
436 iowarrior_write_callback, dev,
437 dev->int_out_endpoint->bInterval);
438 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
439 if (copy_from_user(buf, user_buffer, count)) {
443 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
445 dbg("%s submit error %d for urb nr.%d", __func__,
446 retval, atomic_read(&dev->write_busy));
451 usb_free_urb(int_out_urb);
455 /* what do we have here ? An unsupported Product-ID ? */
456 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
457 __func__, dev->product_id);
463 usb_free_coherent(dev->udev, dev->report_size, buf,
464 int_out_urb->transfer_dma);
466 usb_free_urb(int_out_urb);
468 atomic_dec(&dev->write_busy);
469 wake_up_interruptible(&dev->write_wait);
471 mutex_unlock(&dev->mutex);
478 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
481 struct iowarrior *dev = NULL;
483 __u8 __user *user_buffer;
485 int io_res; /* checks for bytes read/written and copy_to/from_user results */
487 dev = file->private_data;
492 buffer = kzalloc(dev->report_size, GFP_KERNEL);
496 /* lock this object */
497 mutex_lock(&iowarrior_mutex);
498 mutex_lock(&dev->mutex);
500 /* verify that the device wasn't unplugged */
506 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd,
513 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
516 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
517 user_buffer = (__u8 __user *)arg;
518 io_res = copy_from_user(buffer, user_buffer,
523 io_res = usb_set_report(dev->interface, 2, 0,
531 dev_err(&dev->interface->dev,
532 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
537 user_buffer = (__u8 __user *)arg;
538 io_res = usb_get_report(dev->udev,
539 dev->interface->cur_altsetting, 1, 0,
540 buffer, dev->report_size);
544 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
551 /* Report available information for the device */
552 struct iowarrior_info info;
553 /* needed for power consumption */
554 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
556 /* directly from the descriptor */
557 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
558 info.product = dev->product_id;
559 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
561 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
562 info.speed = le16_to_cpu(dev->udev->speed);
563 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
564 info.report_size = dev->report_size;
566 /* serial number string has been read earlier 8 chars or empty string */
567 memcpy(info.serial, dev->chip_serial,
568 sizeof(dev->chip_serial));
569 if (cfg_descriptor == NULL) {
570 info.power = -1; /* no information available */
572 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
573 info.power = cfg_descriptor->bMaxPower * 2;
575 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
576 sizeof(struct iowarrior_info));
582 /* return that we did not understand this ioctl call */
587 /* unlock the device */
588 mutex_unlock(&dev->mutex);
589 mutex_unlock(&iowarrior_mutex);
597 static int iowarrior_open(struct inode *inode, struct file *file)
599 struct iowarrior *dev = NULL;
600 struct usb_interface *interface;
606 mutex_lock(&iowarrior_mutex);
607 subminor = iminor(inode);
609 interface = usb_find_interface(&iowarrior_driver, subminor);
611 mutex_unlock(&iowarrior_mutex);
612 err("%s - error, can't find device for minor %d", __func__,
617 mutex_lock(&iowarrior_open_disc_lock);
618 dev = usb_get_intfdata(interface);
620 mutex_unlock(&iowarrior_open_disc_lock);
621 mutex_unlock(&iowarrior_mutex);
625 mutex_lock(&dev->mutex);
626 mutex_unlock(&iowarrior_open_disc_lock);
628 /* Only one process can open each device, no sharing. */
634 /* setup interrupt handler for receiving values */
635 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
636 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
640 /* increment our usage count for the driver */
642 /* save our object in the file's private structure */
643 file->private_data = dev;
647 mutex_unlock(&dev->mutex);
648 mutex_unlock(&iowarrior_mutex);
655 static int iowarrior_release(struct inode *inode, struct file *file)
657 struct iowarrior *dev;
660 dev = file->private_data;
665 dbg("%s - minor %d", __func__, dev->minor);
667 /* lock our device */
668 mutex_lock(&dev->mutex);
670 if (dev->opened <= 0) {
671 retval = -ENODEV; /* close called more than once */
672 mutex_unlock(&dev->mutex);
674 dev->opened = 0; /* we're closeing now */
678 The device is still connected so we only shutdown
679 pending read-/write-ops.
681 usb_kill_urb(dev->int_in_urb);
682 wake_up_interruptible(&dev->read_wait);
683 wake_up_interruptible(&dev->write_wait);
684 mutex_unlock(&dev->mutex);
686 /* The device was unplugged, cleanup resources */
687 mutex_unlock(&dev->mutex);
688 iowarrior_delete(dev);
694 static unsigned iowarrior_poll(struct file *file, poll_table * wait)
696 struct iowarrior *dev = file->private_data;
697 unsigned int mask = 0;
700 return POLLERR | POLLHUP;
702 poll_wait(file, &dev->read_wait, wait);
703 poll_wait(file, &dev->write_wait, wait);
706 return POLLERR | POLLHUP;
708 if (read_index(dev) != -1)
709 mask |= POLLIN | POLLRDNORM;
711 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
712 mask |= POLLOUT | POLLWRNORM;
717 * File operations needed when we register this driver.
718 * This assumes that this driver NEEDS file operations,
719 * of course, which means that the driver is expected
720 * to have a node in the /dev directory. If the USB
721 * device were for a network interface then the driver
722 * would use "struct net_driver" instead, and a serial
723 * device would use "struct tty_driver".
725 static const struct file_operations iowarrior_fops = {
726 .owner = THIS_MODULE,
727 .write = iowarrior_write,
728 .read = iowarrior_read,
729 .unlocked_ioctl = iowarrior_ioctl,
730 .open = iowarrior_open,
731 .release = iowarrior_release,
732 .poll = iowarrior_poll,
735 static char *iowarrior_devnode(struct device *dev, mode_t *mode)
737 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
741 * usb class driver info in order to get a minor number from the usb core,
742 * and to have the device registered with devfs and the driver core
744 static struct usb_class_driver iowarrior_class = {
745 .name = "iowarrior%d",
746 .devnode = iowarrior_devnode,
747 .fops = &iowarrior_fops,
748 .minor_base = IOWARRIOR_MINOR_BASE,
751 /*---------------------------------*/
752 /* probe and disconnect functions */
753 /*---------------------------------*/
757 * Called by the usb core when a new device is connected that it thinks
758 * this driver might be interested in.
760 static int iowarrior_probe(struct usb_interface *interface,
761 const struct usb_device_id *id)
763 struct usb_device *udev = interface_to_usbdev(interface);
764 struct iowarrior *dev = NULL;
765 struct usb_host_interface *iface_desc;
766 struct usb_endpoint_descriptor *endpoint;
768 int retval = -ENOMEM;
770 /* allocate memory for our device state and intialize it */
771 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
773 dev_err(&interface->dev, "Out of memory\n");
777 mutex_init(&dev->mutex);
779 atomic_set(&dev->intr_idx, 0);
780 atomic_set(&dev->read_idx, 0);
781 spin_lock_init(&dev->intr_idx_lock);
782 atomic_set(&dev->overflow_flag, 0);
783 init_waitqueue_head(&dev->read_wait);
784 atomic_set(&dev->write_busy, 0);
785 init_waitqueue_head(&dev->write_wait);
788 dev->interface = interface;
790 iface_desc = interface->cur_altsetting;
791 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
793 /* set up the endpoint information */
794 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
795 endpoint = &iface_desc->endpoint[i].desc;
797 if (usb_endpoint_is_int_in(endpoint))
798 dev->int_in_endpoint = endpoint;
799 if (usb_endpoint_is_int_out(endpoint))
800 /* this one will match for the IOWarrior56 only */
801 dev->int_out_endpoint = endpoint;
803 /* we have to check the report_size often, so remember it in the endianess suitable for our machine */
804 dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize);
805 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
806 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
807 /* IOWarrior56 has wMaxPacketSize different from report size */
808 dev->report_size = 7;
810 /* create the urb and buffer for reading */
811 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
812 if (!dev->int_in_urb) {
813 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
816 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
817 if (!dev->int_in_buffer) {
818 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
821 usb_fill_int_urb(dev->int_in_urb, dev->udev,
822 usb_rcvintpipe(dev->udev,
823 dev->int_in_endpoint->bEndpointAddress),
824 dev->int_in_buffer, dev->report_size,
825 iowarrior_callback, dev,
826 dev->int_in_endpoint->bInterval);
827 /* create an internal buffer for interrupt data from the device */
829 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
831 if (!dev->read_queue) {
832 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
835 /* Get the serial-number of the chip */
836 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
837 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
838 sizeof(dev->chip_serial));
839 if (strlen(dev->chip_serial) != 8)
840 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
842 /* Set the idle timeout to 0, if this is interface 0 */
843 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
844 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
846 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
847 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
849 /* allow device read and ioctl */
852 /* we can register the device now, as it is ready */
853 usb_set_intfdata(interface, dev);
855 retval = usb_register_dev(interface, &iowarrior_class);
857 /* something prevented us from registering this driver */
858 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
859 usb_set_intfdata(interface, NULL);
863 dev->minor = interface->minor;
865 /* let the user know what node this device is now attached to */
866 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
867 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
868 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
872 iowarrior_delete(dev);
877 * iowarrior_disconnect
879 * Called by the usb core when the device is removed from the system.
881 static void iowarrior_disconnect(struct usb_interface *interface)
883 struct iowarrior *dev;
886 dev = usb_get_intfdata(interface);
887 mutex_lock(&iowarrior_open_disc_lock);
888 usb_set_intfdata(interface, NULL);
892 /* give back our minor */
893 usb_deregister_dev(interface, &iowarrior_class);
895 mutex_lock(&dev->mutex);
897 /* prevent device read, write and ioctl */
900 mutex_unlock(&dev->mutex);
901 mutex_unlock(&iowarrior_open_disc_lock);
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 wake_up_interruptible(&dev->read_wait);
910 wake_up_interruptible(&dev->write_wait);
912 /* no process is using the device, cleanup now */
913 iowarrior_delete(dev);
916 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
917 minor - IOWARRIOR_MINOR_BASE);
920 /* usb specific object needed to register this driver with the usb subsystem */
921 static struct usb_driver iowarrior_driver = {
923 .probe = iowarrior_probe,
924 .disconnect = iowarrior_disconnect,
925 .id_table = iowarrior_ids,
928 static int __init iowarrior_init(void)
930 return usb_register(&iowarrior_driver);
933 static void __exit iowarrior_exit(void)
935 usb_deregister(&iowarrior_driver);
938 module_init(iowarrior_init);
939 module_exit(iowarrior_exit);