patch-2.3.39 linux/drivers/usb/devio.c

• Lines: 890
• Date: Mon Jan 10 11:32:48 2000
• Orig file: v2.3.38/linux/drivers/usb/devio.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.38/linux/drivers/usb/devio.c linux/drivers/usb/devio.c
@@ -0,0 +1,889 @@
+/*****************************************************************************/
+
+/*
+ *      devio.c  --  User space communication with USB devices.
+ *
+ *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  This file implements the usbdevfs/x/y files, where
+ *  x is the bus number and y the device number.
+ *
+ *  It allows user space programs/"drivers" to communicate directly
+ *  with USB devices without intervening kernel driver.
+ *
+ *  Revision history
+ *    22.12.1999   0.1   Initial release (split from proc_usb.c)
+ *    04.01.2000   0.2   Turned into its own filesystem
+ */
+
+/*****************************************************************************/
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/signal.h>
+#include <asm/uaccess.h>
+
+#include "usb.h"
+#include "usbdevice_fs.h"
+
+struct async {
+        struct list_head asynclist;
+        struct dev_state *ps;
+	struct task_struct *task;
+	unsigned int signr;
+	void *userbuffer;
+        void *userurb;
+        urb_t urb;
+};
+
+static long long usbdev_lseek(struct file *file, long long offset, int orig)
+{
+	switch (orig) {
+	case 0:
+		file->f_pos = offset;
+		return file->f_pos;
+
+	case 1:
+		file->f_pos += offset;
+		return file->f_pos;
+
+	case 2:
+		return -EINVAL;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static ssize_t usbdev_read(struct file *file, char * buf, size_t nbytes, loff_t *ppos)
+{
+	struct dev_state *ps = (struct dev_state *)file->private_data;
+	ssize_t ret = 0;
+	unsigned len;
+	loff_t pos;
+
+	pos = *ppos;
+	down_read(&ps->devsem);
+	if (!ps->dev)
+		ret = -ENODEV;
+	else if (pos < 0)
+		ret = -EINVAL;
+	else if (pos < sizeof(struct usb_device_descriptor)) {
+		len = sizeof(struct usb_device_descriptor) - pos;
+		if (len > nbytes)
+			len = nbytes;
+		if (copy_to_user(buf, ((char *)&ps->dev->descriptor) + pos, len))
+			ret = -EFAULT;
+		else {
+			*ppos += len;
+			buf += len;
+			nbytes -= len;
+			ret += len;
+		}
+	}
+	up_read(&ps->devsem);
+	return ret;
+}
+
+extern inline unsigned int ld2(unsigned int x)
+{
+        unsigned int r = 0;
+        
+        if (x >= 0x10000) {
+                x >>= 16;
+                r += 16;
+        }
+        if (x >= 0x100) {
+                x >>= 8;
+                r += 8;
+        }
+        if (x >= 0x10) {
+                x >>= 4;
+                r += 4;
+        }
+        if (x >= 4) {
+                x >>= 2;
+                r += 2;
+        }
+        if (x >= 2)
+                r++;
+        return r;
+}
+
+/*
+ * async list handling
+ */
+
+static struct async *alloc_async(unsigned int numisoframes)
+{
+        unsigned int assize = sizeof(struct async) + numisoframes * sizeof(iso_packet_descriptor_t);
+        struct async *as = kmalloc(assize, GFP_KERNEL);
+        if (!as)
+                return NULL;
+        memset(as, 0, assize);
+        as->urb.number_of_packets = numisoframes;
+        return as;
+}
+
+static void free_async(struct async *as)
+{
+        if (as->urb.transfer_buffer)
+                kfree(as->urb.transfer_buffer);
+        kfree(as);
+}
+
+extern __inline__ void async_newpending(struct async *as)
+{
+        struct dev_state *ps = as->ps;
+        unsigned long flags;
+        
+        spin_lock_irqsave(&ps->lock, flags);
+        list_add_tail(&as->asynclist, &ps->async_pending);
+        spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+extern __inline__ void async_removepending(struct async *as)
+{
+        struct dev_state *ps = as->ps;
+        unsigned long flags;
+        
+        spin_lock_irqsave(&ps->lock, flags);
+        list_del(&as->asynclist);
+        INIT_LIST_HEAD(&as->asynclist);
+        spin_unlock_irqrestore(&ps->lock, flags);
+}
+
+extern __inline__ struct async *async_getcompleted(struct dev_state *ps)
+{
+        unsigned long flags;
+        struct async *as = NULL;
+
+        spin_lock_irqsave(&ps->lock, flags);
+        if (!list_empty(&ps->async_completed)) {
+                as = list_entry(ps->async_completed.next, struct async, asynclist);
+                list_del(&as->asynclist);
+                INIT_LIST_HEAD(&as->asynclist);
+        }
+        spin_unlock_irqrestore(&ps->lock, flags);
+        return as;
+}
+
+extern __inline__ struct async *async_getpending(struct dev_state *ps, void *userurb)
+{
+        unsigned long flags;
+        struct async *as;
+        struct list_head *p;
+
+        spin_lock_irqsave(&ps->lock, flags);
+        for (p = ps->async_pending.next; p != &ps->async_pending; ) {
+                as = list_entry(p, struct async, asynclist);
+                p = p->next;
+                if (as->userurb != userurb)
+                        continue;
+                list_del(&as->asynclist);
+                INIT_LIST_HEAD(&as->asynclist);
+                spin_unlock_irqrestore(&ps->lock, flags);
+                return as;
+        }
+        spin_unlock_irqrestore(&ps->lock, flags);
+        return NULL;
+}
+
+static void async_completed(purb_t urb)
+{
+        struct async *as = (struct async *)urb->context;
+        struct dev_state *ps = as->ps;
+	struct siginfo sinfo;
+
+#if 0
+	printk(KERN_DEBUG "usbdevfs: async_completed: status %d errcount %d actlen %d pipe 0x%x\n", 
+	       urb->status, urb->error_count, urb->actual_length, urb->pipe);
+#endif
+        spin_lock(&ps->lock);
+        list_del(&as->asynclist);
+        list_add_tail(&as->asynclist, &ps->async_completed);
+        spin_unlock(&ps->lock);
+        wake_up(&ps->wait);
+	if (as->signr) {
+		sinfo.si_signo = as->signr;
+		sinfo.si_errno = as->urb.status;
+		sinfo.si_code = SI_ASYNCIO;
+		sinfo.si_addr = as->userurb;
+		send_sig_info(as->signr, &sinfo, as->task);
+	}
+}
+
+static void destroy_all_async(struct dev_state *ps)
+{
+        struct async *as;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ps->lock, flags);
+        if (!list_empty(&ps->async_pending)) {
+                as = list_entry(ps->async_pending.next, struct async, asynclist);
+                list_del(&as->asynclist);
+                INIT_LIST_HEAD(&as->asynclist);
+                spin_unlock_irqrestore(&ps->lock, flags);
+                /* usb_unlink_urb calls the completion handler with status == USB_ST_URB_KILLED */
+                usb_unlink_urb(&as->urb);
+                spin_lock_irqsave(&ps->lock, flags);
+        }
+        spin_unlock_irqrestore(&ps->lock, flags);
+        while ((as = async_getcompleted(ps)))
+                free_async(as);
+}
+
+/*
+ * interface claiming
+ */
+
+static void *driver_probe(struct usb_device *dev, unsigned int intf)
+{
+	return NULL;
+}
+
+static void driver_disconnect(struct usb_device *dev, void *context)
+{
+	struct dev_state *ps = (struct dev_state *)context;
+
+	ps->ifclaimed = 0;
+}
+
+struct usb_driver usbdevfs_driver = {
+	"usbdevfs",
+	driver_probe,
+	driver_disconnect,
+	LIST_HEAD_INIT(usbdevfs_driver.driver_list),
+	NULL,
+	0
+};
+
+static int claimintf(struct dev_state *ps, unsigned int intf)
+{
+	struct usb_device *dev = ps->dev;
+	struct usb_interface *iface;
+	int err;
+
+	if (intf >= 8*sizeof(ps->ifclaimed) || !dev || intf >= dev->actconfig->bNumInterfaces)
+		return -EINVAL;
+	/* already claimed */
+	if (test_bit(intf, &ps->ifclaimed))
+		return 0;
+	iface = &dev->actconfig->interface[intf];
+	err = -EBUSY;
+	lock_kernel();
+	if (!usb_interface_claimed(iface)) {
+		usb_driver_claim_interface(&usbdevfs_driver, iface, ps);
+		set_bit(intf, &ps->ifclaimed);
+		err = 0;
+	}
+	unlock_kernel();
+	return err;
+}
+
+static int releaseintf(struct dev_state *ps, unsigned int intf)
+{
+	struct usb_device *dev;
+	struct usb_interface *iface;
+	int err;
+
+	if (intf >= 8*sizeof(ps->ifclaimed))
+		return -EINVAL;
+	err = -EINVAL;
+	lock_kernel();
+	dev = ps->dev;
+	if (dev && test_and_clear_bit(intf, &ps->ifclaimed)) {
+		iface = &dev->actconfig->interface[intf];
+		usb_driver_release_interface(&usbdevfs_driver, iface);
+		err = 0;
+	}
+	unlock_kernel();
+	return err;
+}
+
+static int checkintf(struct dev_state *ps, unsigned int intf)
+{
+	if (intf >= 8*sizeof(ps->ifclaimed))
+		return -EINVAL;
+	if (test_bit(intf, &ps->ifclaimed))
+		return 0;
+	/* if not yet claimed, claim it for the driver */
+	printk(KERN_WARNING "usbdevfs: process %d (%s) did not claim interface %u before use\n",
+	       current->pid, current->comm, intf);
+	return claimintf(ps, intf);
+}
+
+static int findintfep(struct usb_device *dev, unsigned int ep)
+{
+	unsigned int i, j, e;
+        struct usb_interface *iface;
+	struct usb_interface_descriptor *alts;
+	struct usb_endpoint_descriptor *endpt;
+
+	if (ep & ~(USB_DIR_IN|0xf))
+		return -EINVAL;
+	for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
+		iface = &dev->actconfig->interface[i];
+		for (j = 0; j < iface->num_altsetting; j++) {
+                        alts = &iface->altsetting[j];
+			for (e = 0; e < alts->bNumEndpoints; e++) {
+				endpt = &alts->endpoint[e];
+				if (endpt->bEndpointAddress == ep)
+					return i;
+			}
+		}
+	}
+	return -ENOENT; 
+}
+
+static int findintfif(struct usb_device *dev, unsigned int ifn)
+{
+	unsigned int i, j;
+        struct usb_interface *iface;
+	struct usb_interface_descriptor *alts;
+
+	if (ifn & ~0xff)
+		return -EINVAL;
+	for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
+		iface = &dev->actconfig->interface[i];
+		for (j = 0; j < iface->num_altsetting; j++) {
+                        alts = &iface->altsetting[j];
+			if (alts->bInterfaceNumber == ifn)
+				return i;
+		}
+	}
+	return -ENOENT; 
+}
+
+/*
+ * file operations
+ */
+static int usbdev_open(struct inode *inode, struct file *file)
+{
+	struct usb_device *dev;
+	struct dev_state *ps;
+	int ret;
+
+	/* 
+	 * no locking necessary here, as both sys_open (actually filp_open)
+	 * and the hub thread have the kernel lock
+	 * (still acquire the kernel lock for safety)
+	 */
+	lock_kernel();
+	ret = -ENOENT;
+	if (ITYPE(inode->i_ino) != IDEVICE)
+		goto out;
+	dev = inode->u.usbdev_i.p.dev;
+	if (!dev)
+		goto out;
+	ret = -ENOMEM;
+	if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
+		goto out;
+	ret = 0;
+	ps->dev = dev;
+	ps->file = file;
+	spin_lock_init(&ps->lock);
+	INIT_LIST_HEAD(&ps->async_pending);
+	INIT_LIST_HEAD(&ps->async_completed);
+	init_waitqueue_head(&ps->wait);
+	init_rwsem(&ps->devsem);
+	ps->discsignr = 0;
+	ps->disctask = current;
+	ps->disccontext = NULL;
+	ps->ifclaimed = 0;
+	wmb();
+	list_add_tail(&ps->list, &dev->filelist);
+	file->private_data = ps;
+ out:
+	unlock_kernel();
+        return ret;
+}
+
+static int usbdev_release(struct inode *inode, struct file *file)
+{
+	struct dev_state *ps = (struct dev_state *)file->private_data;
+	unsigned int i;
+
+	lock_kernel();
+	list_del(&ps->list);
+	INIT_LIST_HEAD(&ps->list);
+	if (ps->dev) {
+		for (i = 0; ps->ifclaimed && i < 8*sizeof(ps->ifclaimed); i++)
+			if (test_bit(i, &ps->ifclaimed))
+				releaseintf(ps, i);
+	}
+	unlock_kernel();
+	destroy_all_async(ps);
+	kfree(ps);
+        return 0;
+}
+
+static int proc_control(struct dev_state *ps, void *arg)
+{
+	struct usb_device *dev = ps->dev;
+	struct usbdevfs_ctrltransfer ctrl;
+	unsigned int tmo;
+	unsigned char *tbuf;
+	int i, ret;
+
+	copy_from_user_ret(&ctrl, (void *)arg, sizeof(ctrl), -EFAULT);
+	switch (ctrl.requesttype & 0x1f) {
+	case USB_RECIP_ENDPOINT:
+		if ((ret = findintfep(ps->dev, ctrl.index & 0xff)) < 0)
+			return ret;
+		if ((ret = checkintf(ps, ret)))
+			return ret;
+		break;
+
+	case USB_RECIP_INTERFACE:
+		if ((ret = findintfif(ps->dev, ctrl.index & 0xff)) < 0)
+			return ret;
+		if ((ret = checkintf(ps, ret)))
+			return ret;
+		break;
+	}
+	if (ctrl.length > PAGE_SIZE)
+		return -EINVAL;
+	if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
+		return -ENOMEM;
+	tmo = (ctrl.timeout * HZ + 999) / 1000;
+	if (ctrl.requesttype & 0x80) {
+		if (ctrl.length && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.length)) {
+			free_page((unsigned long)tbuf);
+			return -EINVAL;
+		}
+		i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
+				    ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
+		if ((i > 0) && ctrl.length) {
+			copy_to_user_ret(ctrl.data, tbuf, ctrl.length, -EFAULT);
+		}
+	} else {
+		if (ctrl.length) {
+			copy_from_user_ret(tbuf, ctrl.data, ctrl.length, -EFAULT);
+		}
+		i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
+				    ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
+	}
+	free_page((unsigned long)tbuf);
+	if (i<0) {
+		printk(KERN_DEBUG "usbdevfs: USBDEVFS_CONTROL failed dev %d rqt %u rq %u len %u ret %d\n", 
+		       dev->devnum, ctrl.requesttype, ctrl.request, ctrl.length, i);
+	}
+	return i;
+}
+
+static int proc_bulk(struct dev_state *ps, void *arg)
+{
+	struct usb_device *dev = ps->dev;
+	struct usbdevfs_bulktransfer bulk;
+	unsigned int tmo, len1, pipe;
+	unsigned long len2;
+	unsigned char *tbuf;
+	int i, ret;
+
+	copy_from_user_ret(&bulk, (void *)arg, sizeof(bulk), -EFAULT);
+	if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
+		return ret;
+	if ((ret = checkintf(ps, ret)))
+		return ret;
+	if (bulk.ep & USB_DIR_IN)
+		pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
+	else
+		pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
+	if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
+		return -EINVAL;
+	len1 = bulk.len;
+	if (len1 > PAGE_SIZE)
+		len1 = PAGE_SIZE;
+	if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
+		return -ENOMEM;
+	tmo = (bulk.timeout * HZ + 999) / 1000;
+	if (bulk.ep & 0x80) {
+		if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
+			free_page((unsigned long)tbuf);
+			return -EINVAL;
+		}
+		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
+		if (!i && len2) {
+			copy_to_user_ret(bulk.data, tbuf, len2, -EFAULT);
+		}
+	} else {
+		if (len1) {
+			copy_from_user_ret(tbuf, bulk.data, len1, -EFAULT);
+		}
+		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
+	}
+	free_page((unsigned long)tbuf);
+	if (i < 0) {
+		printk(KERN_WARNING "usbdevfs: USBDEVFS_BULK failed dev %d ep 0x%x len %u ret %d\n", 
+		       dev->devnum, bulk.ep, bulk.len, i);
+		return i;
+	}
+	return len2;
+}
+
+static int proc_resetep(struct dev_state *ps, void *arg)
+{
+	unsigned int ep;
+	int ret;
+
+	get_user_ret(ep, (unsigned int *)arg, -EFAULT);
+	if ((ret = findintfep(ps->dev, ep)) < 0)
+		return ret;
+	if ((ret = checkintf(ps, ret)))
+		return ret;
+	usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
+	return 0;
+}
+
+static int proc_setintf(struct dev_state *ps, void *arg)
+{
+	struct usbdevfs_setinterface setintf;
+	int ret;
+
+	copy_from_user_ret(&setintf, arg, sizeof(setintf), -EFAULT);
+	if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
+		return ret;
+	if ((ret = checkintf(ps, ret)))
+		return ret;
+	if (usb_set_interface(ps->dev, setintf.interface, setintf.altsetting))
+		return -EINVAL;
+	return 0;
+}
+
+static int proc_setconfig(struct dev_state *ps, void *arg)
+{
+	unsigned int u;
+
+	get_user_ret(u, (unsigned int *)arg, -EFAULT);
+	if (usb_set_configuration(ps->dev, u) < 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int proc_submiturb(struct dev_state *ps, void *arg)
+{
+	struct usbdevfs_urb uurb;
+	struct usbdevfs_iso_packet_desc *isopkt = NULL;
+	struct async *as;
+	unsigned int u, totlen, isofrmlen;
+	int ret;
+
+	copy_from_user_ret(&uurb, arg, sizeof(uurb), -EFAULT);
+	if (uurb.flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_DISABLE_SPD))
+		return -EINVAL;
+	if (!uurb.buffer)
+		return -EINVAL;
+	if (uurb.signr != 0 && (uurb.signr < SIGRTMIN || uurb.signr > SIGRTMAX))
+		return -EINVAL;
+	if ((ret = findintfep(ps->dev, uurb.endpoint)) < 0)
+		return ret;
+	if ((ret = checkintf(ps, ret)))
+		return ret;
+	switch(uurb.type) {
+	case USBDEVFS_URB_TYPE_BULK:
+		uurb.number_of_packets = 0;
+		if (uurb.buffer_length > 8192)
+			return -EINVAL;
+		if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
+			return -EFAULT;
+		break;
+
+	case USBDEVFS_URB_TYPE_ISO:
+		/* arbitrary limit */
+		if (uurb.number_of_packets < 1 || uurb.number_of_packets > 128)
+			return -EINVAL;
+		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb.number_of_packets;
+		if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
+			return -ENOMEM;
+		if (copy_from_user(isopkt, &((struct usbdevfs_urb *)arg)->iso_frame_desc, isofrmlen)) {
+			kfree(isopkt);
+			return -EFAULT;
+		}
+		for (totlen = u = 0; u < uurb.number_of_packets; u++) {
+			if (isopkt[u].length > 1023) {
+				kfree(isopkt);
+				return -EINVAL;
+			}
+			totlen += isopkt[u].length;
+		}
+		if (totlen > 8192) {
+			kfree(isopkt);
+			return -ENOMEM;
+		}
+		uurb.buffer_length = totlen;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	if (!(as = alloc_async(uurb.number_of_packets))) {
+		if (isopkt)
+			kfree(isopkt);
+		return -ENOMEM;
+	}
+	if (!(as->urb.transfer_buffer = kmalloc(uurb.buffer_length, GFP_KERNEL))) {
+		if (isopkt)
+			kfree(isopkt);
+		free_async(as);
+		return -ENOMEM;
+	}
+        as->urb.next = NULL;
+        as->urb.dev = ps->dev;
+        as->urb.pipe = (uurb.type << 30) | __create_pipe(ps->dev, uurb.endpoint & 0xf) | (uurb.endpoint & USB_DIR_IN);
+        as->urb.transfer_flags = uurb.flags;
+	as->urb.transfer_buffer_length = uurb.buffer_length;
+	as->urb.start_frame = uurb.start_frame;
+	as->urb.number_of_packets = uurb.number_of_packets;
+        as->urb.context = as;
+        as->urb.complete = async_completed;
+	for (totlen = u = 0; u < uurb.number_of_packets; u++) {
+		as->urb.iso_frame_desc[u].offset = totlen;
+		as->urb.iso_frame_desc[u].length = isopkt[u].length;
+		totlen += isopkt[u].length;
+	}
+	if (isopkt)
+		kfree(isopkt);
+	as->ps = ps;
+        as->userurb = arg;
+	if (uurb.endpoint & USB_DIR_IN)
+		as->userbuffer = uurb.buffer;
+	else
+		as->userbuffer = NULL;
+	as->signr = uurb.signr;
+	as->task = current;
+	if (!(uurb.endpoint & USB_DIR_IN)) {
+		if (copy_from_user(as->urb.transfer_buffer, uurb.buffer, as->urb.transfer_buffer_length)) {
+			free_async(as);
+			return -EFAULT;
+		}
+	}
+        async_newpending(as);
+        if ((ret = usb_submit_urb(&as->urb))) {
+		printk(KERN_DEBUG "usbdevfs: usb_submit_urb returned %d\n", ret);
+                async_removepending(as);
+                free_async(as);
+                return ret;
+        }
+        return 0;
+}
+
+static int proc_unlinkurb(struct dev_state *ps, void *arg)
+{
+	struct async *as;
+
+	as = async_getpending(ps, arg);
+	if (!as)
+		return -EINVAL;
+	usb_unlink_urb(&as->urb);
+	return 0;
+}
+
+static int processcompl(struct async *as)
+{
+	unsigned int i;
+
+	if (as->userbuffer)
+		if (copy_to_user(as->userbuffer, as->urb.transfer_buffer, as->urb.transfer_buffer_length))
+			return -EFAULT;
+	put_user_ret(as->urb.status, &((struct usbdevfs_urb *)as->userurb)->status, -EFAULT);
+	put_user_ret(as->urb.actual_length, &((struct usbdevfs_urb *)as->userurb)->actual_length, -EFAULT);
+	put_user_ret(as->urb.error_count, &((struct usbdevfs_urb *)as->userurb)->error_count, -EFAULT);
+	if (!(usb_pipeisoc(as->urb.pipe)))
+		return 0;
+	for (i = 0; i < as->urb.number_of_packets; i++) {
+		put_user_ret(as->urb.iso_frame_desc[i].actual_length, 
+			     &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].actual_length, 
+			     -EFAULT);
+		put_user_ret(as->urb.iso_frame_desc[i].status, 
+			     &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].status, 
+			     -EFAULT);
+	}
+	return 0;
+}
+
+static int proc_reapurb(struct dev_state *ps, void *arg)
+{
+        DECLARE_WAITQUEUE(wait, current);
+	struct async *as = NULL;
+	void *addr;
+	int ret;
+
+	add_wait_queue(&ps->wait, &wait);
+	while (ps->dev) {
+		__set_current_state(TASK_INTERRUPTIBLE);
+		if ((as = async_getcompleted(ps)))
+			break;
+		if (signal_pending(current))
+			break;
+		up_read(&ps->devsem);
+		schedule();
+		down_read(&ps->devsem);
+	}
+	remove_wait_queue(&ps->wait, &wait);
+	set_current_state(TASK_RUNNING);
+	if (as) {
+		ret = processcompl(as);
+		addr = as->userurb;
+		free_async(as);
+		if (ret)
+			return ret;
+		put_user_ret(addr, (void **)arg, -EFAULT);
+		return 0;
+	}
+	if (signal_pending(current))
+		return -EINTR;
+	return -EIO;
+}
+
+static int proc_reapurbnonblock(struct dev_state *ps, void *arg)
+{
+	struct async *as;
+	void *addr;
+	int ret;
+
+	if (!(as = async_getcompleted(ps)))
+		return -EAGAIN;
+	ret = processcompl(as);
+	addr = as->userurb;
+	free_async(as);
+	if (ret)
+		return ret;
+	put_user_ret(addr, (void **)arg, -EFAULT);
+	return 0;
+}
+
+static int proc_disconnectsignal(struct dev_state *ps, void *arg)
+{
+	struct usbdevfs_disconnectsignal ds;
+
+	copy_from_user_ret(&ds, arg, sizeof(ds), -EFAULT);
+	if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
+		return -EINVAL;
+	ps->discsignr = ds.signr;
+	ps->disccontext = ds.context;
+	return 0;
+}
+
+static int proc_claiminterface(struct dev_state *ps, void *arg)
+{
+	unsigned int intf;
+	int ret;
+
+	get_user_ret(intf, (unsigned int *)arg, -EFAULT);
+	if ((ret = findintfif(ps->dev, intf)) < 0)
+		return ret;
+	return claimintf(ps, ret);
+}
+
+static int proc_releaseinterface(struct dev_state *ps, void *arg)
+{
+	unsigned int intf;
+	int ret;
+
+	get_user_ret(intf, (unsigned int *)arg, -EFAULT);
+	if ((ret = findintfif(ps->dev, intf)) < 0)
+		return ret;
+	return releaseintf(ps, intf);
+}
+
+static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct dev_state *ps = (struct dev_state *)file->private_data;
+	int ret = -ENOIOCTLCMD;
+
+	if (!(file->f_mode & FMODE_WRITE))
+		return -EPERM;
+	down_read(&ps->devsem);
+	if (!ps->dev) {
+		up_read(&ps->devsem);
+		return -ENODEV;
+	}
+	switch (cmd) {
+	case USBDEVFS_CONTROL:
+		ret = proc_control(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_BULK:
+		ret = proc_bulk(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_RESETEP:
+		ret = proc_resetep(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_SETINTERFACE:
+		ret = proc_setintf(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_SETCONFIGURATION:
+		ret = proc_setconfig(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_SUBMITURB:
+		ret = proc_submiturb(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_DISCARDURB:
+		ret = proc_unlinkurb(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_REAPURB:
+		ret = proc_reapurb(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_REAPURBNDELAY:
+		ret = proc_reapurbnonblock(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_DISCSIGNAL:
+		ret = proc_disconnectsignal(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_CLAIMINTERFACE:
+		ret = proc_claiminterface(ps, (void *)arg);
+		break;
+
+	case USBDEVFS_RELEASEINTERFACE:
+		ret = proc_releaseinterface(ps, (void *)arg);
+		break;
+
+	}
+	up_read(&ps->devsem);
+	return ret;
+}
+
+static struct file_operations usbdevfs_device_file_operations = {
+	usbdev_lseek,    /* lseek   */
+	usbdev_read,     /* read    */
+	NULL,            /* write   */
+	NULL,            /* readdir */
+	NULL,            /* poll    */
+	usbdev_ioctl,    /* ioctl   */
+	NULL,            /* mmap    */
+	usbdev_open,     /* open    */
+	NULL,            /* flush   */
+	usbdev_release,  /* release */
+	NULL             /* fsync   */
+};
+
+struct inode_operations usbdevfs_device_inode_operations = {
+        &usbdevfs_device_file_operations,  /* file-ops */
+};
+