www.pudn.com > usbold11.rar > devio.c
/*****************************************************************************/ /* * 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 1.11 2000/03/14 00:20:33 acher 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#include #include #include #include #include #include #include #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; }; /* * 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 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); 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 = { "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 = 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) { 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 = 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; 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 = my_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 = 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; 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 > 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; 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); 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_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; } up_read(&ps->devsem); if (ret >= 0) inode->i_atime = CURRENT_TIME; return ret; } 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, };