patch-2.2.18 linux/drivers/usb/devio.c
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- Lines: 1263
- Date:
Thu Dec 7 15:01:47 2000
- Orig file:
v2.2.17/drivers/usb/devio.c
- Orig date:
Thu Jan 1 01:00:00 1970
diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/devio.c linux/drivers/usb/devio.c
@@ -0,0 +1,1262 @@
+/*****************************************************************************/
+
+/*
+ * 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.
+ *
+ * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
+ *
+ * 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 <linux/poll.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <asm/uaccess.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;
+};
+
+/*
+ * my own sync control and bulk methods. Here to experiment
+ * and because the kernel ones set the process to TASK_UNINTERRUPTIBLE.
+ */
+
+struct sync {
+ wait_queue_head_t wait;
+};
+
+static void sync_completed(purb_t urb)
+{
+ struct sync *s = (struct sync *)urb->context;
+
+ wake_up(&s->wait);
+}
+
+static int do_sync(purb_t urb, int timeout)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ unsigned long tm;
+ signed long tmdiff;
+ struct sync s;
+ int ret;
+
+ tm = jiffies+timeout;
+ init_waitqueue_head(&s.wait);
+ add_wait_queue(&s.wait, &wait);
+ urb->context = &s;
+ urb->complete = sync_completed;
+ set_current_state(TASK_INTERRUPTIBLE);
+ if ((ret = usb_submit_urb(urb)))
+ goto out;
+ while (urb->status == -EINPROGRESS) {
+ tmdiff = tm - jiffies;
+ if (tmdiff <= 0) {
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ goto out;
+ }
+ schedule_timeout(tmdiff);
+ }
+ ret = urb->status;
+ out:
+ set_current_state(TASK_RUNNING);
+ usb_unlink_urb(urb);
+ remove_wait_queue(&s.wait, &wait);
+ return ret;
+}
+
+static int my_usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype,
+ __u16 value, __u16 index, void *data, __u16 size, int timeout)
+{
+ urb_t *urb;
+ int ret;
+
+ if (!(urb = usb_alloc_urb(0)))
+ return -ENOMEM;
+ if (!(urb->setup_packet = kmalloc(8, GFP_KERNEL))) {
+ usb_free_urb(urb);
+ return -ENOMEM;
+ }
+ urb->setup_packet[0] = requesttype;
+ urb->setup_packet[1] = request;
+ urb->setup_packet[2] = value;
+ urb->setup_packet[3] = value >> 8;
+ urb->setup_packet[4] = index;
+ urb->setup_packet[5] = index >> 8;
+ urb->setup_packet[6] = size;
+ urb->setup_packet[7] = size >> 8;
+ urb->dev = dev;
+ urb->pipe = pipe;
+ urb->transfer_buffer = data;
+ urb->transfer_buffer_length = size;
+ ret = do_sync(urb, timeout);
+ //if (ret >= 0)
+ // ret = urb->status;
+ if (ret >= 0)
+ ret = urb->actual_length;
+ kfree(urb->setup_packet);
+ usb_free_urb(urb);
+ return ret;
+}
+
+static int my_usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
+ void *data, int len, int *actual_length, int timeout)
+{
+ urb_t *urb;
+ int ret;
+
+ if (!(urb = usb_alloc_urb(0)))
+ return -ENOMEM;
+ urb->dev = dev;
+ urb->pipe = pipe;
+ urb->transfer_buffer = data;
+ urb->transfer_buffer_length = len;
+ ret = do_sync(urb, timeout);
+ //if (ret >= 0)
+ // ret = urb->status;
+ if (ret >= 0 && actual_length != NULL)
+ *actual_length = urb->actual_length;
+ usb_free_urb(urb);
+ return ret;
+}
+
+static loff_t usbdev_lseek(struct file *file, loff_t 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;
+ int i;
+
+ pos = *ppos;
+ down_read(&ps->devsem);
+ if (!ps->dev) {
+ ret = -ENODEV;
+ goto err;
+ } else if (pos < 0) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ 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;
+ goto err;
+ }
+
+ *ppos += len;
+ buf += len;
+ nbytes -= len;
+ ret += len;
+ }
+
+ pos = sizeof(struct usb_device_descriptor);
+ for (i = 0; nbytes && i < ps->dev->descriptor.bNumConfigurations; i++) {
+ struct usb_config_descriptor *config =
+ (struct usb_config_descriptor *)ps->dev->rawdescriptors[i];
+ unsigned int length = le16_to_cpu(config->wTotalLength);
+
+ if (*ppos < pos + length) {
+ len = length - (*ppos - pos);
+ if (len > nbytes)
+ len = nbytes;
+
+ if (copy_to_user(buf,
+ ps->dev->rawdescriptors[i] + (*ppos - pos), len)) {
+ ret = -EFAULT;
+ goto err;
+ }
+
+ *ppos += len;
+ buf += len;
+ nbytes -= len;
+ ret += len;
+ }
+
+ pos += length;
+ }
+
+err:
+ 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 1
+ 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);
+ while (!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 = {
+ name: "usbdevfs",
+ probe: driver_probe,
+ disconnect: driver_disconnect,
+};
+
+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;
+}
+
+extern struct list_head usb_driver_list;
+
+#if 0
+static int finddriver(struct usb_driver **driver, char *name)
+{
+ struct list_head *tmp;
+
+ tmp = usb_driver_list.next;
+ while (tmp != &usb_driver_list) {
+ struct usb_driver *d = list_entry(tmp, struct usb_driver,
+ driver_list);
+
+ if (!strcmp(d->name, name)) {
+ *driver = d;
+ return 0;
+ }
+
+ tmp = tmp->next;
+ }
+
+ return -EINVAL;
+}
+#endif
+
+/*
+ * 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;
+
+ if (copy_from_user(&ctrl, (void *)arg, sizeof(ctrl)))
+ return -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 = my_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) {
+ if (copy_to_user(ctrl.data, tbuf, ctrl.length)) {
+ free_page((unsigned long)tbuf);
+ return -EFAULT;
+ }
+ }
+ } else {
+ if (ctrl.length) {
+ if (copy_from_user(tbuf, ctrl.data, ctrl.length)) {
+ free_page((unsigned long)tbuf);
+ return -EFAULT;
+ }
+ }
+ i = my_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;
+ int len2;
+ unsigned char *tbuf;
+ int i, ret;
+
+ if (copy_from_user(&bulk, (void *)arg, sizeof(bulk)))
+ return -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 = my_usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
+ if (!i && len2) {
+ if (copy_to_user(bulk.data, tbuf, len2)) {
+ free_page((unsigned long)tbuf);
+ return -EFAULT;
+ }
+ }
+ } else {
+ if (len1) {
+ if (copy_from_user(tbuf, bulk.data, len1)) {
+ free_page((unsigned long)tbuf);
+ return -EFAULT;
+ }
+ }
+ i = my_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;
+
+ if (get_user(ep, (unsigned int *)arg))
+ return -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_clearhalt(struct dev_state *ps, void *arg)
+{
+ unsigned int ep;
+ int pipe;
+ int ret;
+
+ if (get_user(ep, (unsigned int *)arg))
+ return -EFAULT;
+ if ((ret = findintfep(ps->dev, ep)) < 0)
+ return ret;
+ if ((ret = checkintf(ps, ret)))
+ return ret;
+ if (ep & USB_DIR_IN)
+ pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
+ else
+ pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
+
+ return usb_clear_halt(ps->dev, pipe);
+}
+
+static int proc_getdriver(struct dev_state *ps, void *arg)
+{
+ struct usbdevfs_getdriver gd;
+ struct usb_interface *interface;
+ int ret;
+
+ if (copy_from_user(&gd, arg, sizeof(gd)))
+ return -EFAULT;
+ if ((ret = findintfif(ps->dev, gd.interface)) < 0)
+ return ret;
+ interface = usb_ifnum_to_if(ps->dev, gd.interface);
+ if (!interface)
+ return -EINVAL;
+ if (!interface->driver)
+ return -ENODATA;
+ strcpy(gd.driver, interface->driver->name);
+ if (copy_to_user(arg, &gd, sizeof(gd)))
+ return -EFAULT;
+ return 0;
+}
+
+static int proc_connectinfo(struct dev_state *ps, void *arg)
+{
+ struct usbdevfs_connectinfo ci;
+
+ ci.devnum = ps->dev->devnum;
+ ci.slow = ps->dev->slow;
+ if (copy_to_user(arg, &ci, sizeof(ci)))
+ return -EFAULT;
+ return 0;
+}
+
+static int proc_resetdevice(struct dev_state *ps)
+{
+ int i, ret;
+
+ ret = usb_reset_device(ps->dev);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ps->dev->actconfig->bNumInterfaces; i++) {
+ struct usb_interface *intf = &ps->dev->actconfig->interface[i];
+
+ /* Don't simulate interfaces we've claimed */
+ if (test_bit(i, &ps->ifclaimed))
+ continue;
+
+ if (intf->driver) {
+ down(&intf->driver->serialize);
+ intf->driver->disconnect(ps->dev, intf->private_data);
+ intf->driver->probe(ps->dev, i);
+ up(&intf->driver->serialize);
+ }
+ }
+
+ return 0;
+}
+
+static int proc_setintf(struct dev_state *ps, void *arg)
+{
+ struct usbdevfs_setinterface setintf;
+ struct usb_interface *interface;
+ int ret;
+
+ if (copy_from_user(&setintf, arg, sizeof(setintf)))
+ return -EFAULT;
+ if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
+ return ret;
+ interface = usb_ifnum_to_if(ps->dev, setintf.interface);
+ if (!interface)
+ return -EINVAL;
+ if (interface->driver) {
+ 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;
+
+ if (get_user(u, (unsigned int *)arg))
+ return -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;
+
+ if (copy_from_user(&uurb, arg, sizeof(uurb)))
+ return -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 > 16384)
+ 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 > 32768) {
+ 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;
+ if (put_user(as->urb.status,
+ &((struct usbdevfs_urb *)as->userurb)->status))
+ return -EFAULT;
+ if (put_user(as->urb.actual_length,
+ &((struct usbdevfs_urb *)as->userurb)->actual_length))
+ return -EFAULT;
+ if (put_user(as->urb.error_count,
+ &((struct usbdevfs_urb *)as->userurb)->error_count))
+ return -EFAULT;
+ if (!(usb_pipeisoc(as->urb.pipe)))
+ return 0;
+ for (i = 0; i < as->urb.number_of_packets; i++) {
+ if (put_user(as->urb.iso_frame_desc[i].actual_length,
+ &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].actual_length))
+ return -EFAULT;
+ if (put_user(as->urb.iso_frame_desc[i].status,
+ &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].status))
+ return -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;
+ if (put_user(addr, (void **)arg))
+ return -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;
+ if (put_user(addr, (void **)arg))
+ return -EFAULT;
+ return 0;
+}
+
+static int proc_disconnectsignal(struct dev_state *ps, void *arg)
+{
+ struct usbdevfs_disconnectsignal ds;
+
+ if (copy_from_user(&ds, arg, sizeof(ds)))
+ return -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;
+
+ if (get_user(intf, (unsigned int *)arg))
+ return -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;
+
+ if (get_user(intf, (unsigned int *)arg))
+ return -EFAULT;
+ if ((ret = findintfif(ps->dev, intf)) < 0)
+ return ret;
+ return releaseintf(ps, intf);
+}
+
+static int proc_ioctl (struct dev_state *ps, void *arg)
+{
+ struct usbdevfs_ioctl ctrl;
+ int size;
+ void *buf = 0;
+ int retval = 0;
+
+ /* get input parameters and alloc buffer */
+ if (copy_from_user (&ctrl, (void *) arg, sizeof (ctrl)))
+ return -EFAULT;
+ if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
+ if ((buf = kmalloc (size, GFP_KERNEL)) == 0)
+ return -ENOMEM;
+ if ((_IOC_DIR (ctrl.ioctl_code) & _IOC_WRITE) != 0
+ && copy_from_user (buf, ctrl.data, size) != 0) {
+ kfree (buf);
+ return -EFAULT;
+ } else
+ memset (arg, 0, size);
+ }
+
+ /* ioctl to device */
+ if (ctrl.ifno < 0) {
+ switch (ctrl.ioctl_code) {
+ /* access/release token for issuing control messages
+ * ask a particular driver to bind/unbind, ... etc
+ */
+ }
+ retval = -ENOSYS;
+
+ /* ioctl to the driver which has claimed a given interface */
+ } else {
+ struct usb_interface *ifp = 0;
+ if (!ps->dev)
+ retval = -ENODEV;
+ else if (ctrl.ifno >= ps->dev->actconfig->bNumInterfaces)
+ retval = -EINVAL;
+ else {
+ if (!(ifp = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
+ retval = -EINVAL;
+ else if (ifp->driver == 0 || ifp->driver->ioctl == 0)
+ retval = -ENOSYS;
+ }
+ if (retval == 0)
+ /* ifno might usefully be passed ... */
+ retval = ifp->driver->ioctl (ps->dev, ctrl.ioctl_code, buf);
+ /* size = min (size, retval)? */
+ }
+
+ /* cleanup and return */
+ if (retval >= 0
+ && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
+ && size > 0
+ && copy_to_user (ctrl.data, buf, size) != 0)
+ retval = -EFAULT;
+ if (buf != 0)
+ kfree (buf);
+ return retval;
+}
+
+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);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_BULK:
+ ret = proc_bulk(ps, (void *)arg);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_RESETEP:
+ ret = proc_resetep(ps, (void *)arg);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_RESET:
+ ret = proc_resetdevice(ps);
+ break;
+
+ case USBDEVFS_CLEAR_HALT:
+ ret = proc_clearhalt(ps, (void *)arg);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ break;
+
+ case USBDEVFS_GETDRIVER:
+ ret = proc_getdriver(ps, (void *)arg);
+ break;
+
+ case USBDEVFS_CONNECTINFO:
+ ret = proc_connectinfo(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);
+ if (ret >= 0)
+ inode->i_mtime = CURRENT_TIME;
+ 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;
+
+ case USBDEVFS_IOCTL:
+ ret = proc_ioctl(ps, (void *) arg);
+ break;
+ }
+ up_read(&ps->devsem);
+ if (ret >= 0)
+ inode->i_atime = CURRENT_TIME;
+ return ret;
+}
+
+/* No kernel lock - fine */
+static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct dev_state *ps = (struct dev_state *)file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait(file, &ps->wait, wait);
+ if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
+ mask |= POLLOUT | POLLWRNORM;
+ if (!ps->dev)
+ mask |= POLLERR | POLLHUP;
+ return mask;
+}
+
+struct file_operations usbdevfs_device_file_operations = {
+ llseek: usbdev_lseek,
+ read: usbdev_read,
+ poll: usbdev_poll,
+ ioctl: usbdev_ioctl,
+ open: usbdev_open,
+ release: usbdev_release,
+};
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)