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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "usbip_common.h"
static int event_handler(struct usbip_device *ud)
{
dbg_eh("enter\n");
/*
* Events are handled by only this thread.
*/
while (usbip_event_happend(ud)) {
dbg_eh("pending event %lx\n", ud->event);
/*
* NOTE: shutdown must come first.
* Shutdown the device.
*/
if (ud->event & USBIP_EH_SHUTDOWN) {
ud->eh_ops.shutdown(ud);
ud->event &= ~USBIP_EH_SHUTDOWN;
break;
}
/* Stop the error handler. */
if (ud->event & USBIP_EH_BYE)
return -1;
/* Reset the device. */
if (ud->event & USBIP_EH_RESET) {
ud->eh_ops.reset(ud);
ud->event &= ~USBIP_EH_RESET;
break;
}
/* Mark the device as unusable. */
if (ud->event & USBIP_EH_UNUSABLE) {
ud->eh_ops.unusable(ud);
ud->event &= ~USBIP_EH_UNUSABLE;
break;
}
/* NOTREACHED */
printk(KERN_ERR "%s: unknown event\n", __func__);
return -1;
}
return 0;
}
static void event_handler_loop(struct usbip_task *ut)
{
struct usbip_device *ud = container_of(ut, struct usbip_device, eh);
while (1) {
if (signal_pending(current)) {
dbg_eh("signal catched!\n");
break;
}
if (event_handler(ud) < 0)
break;
wait_event_interruptible(ud->eh_waitq, usbip_event_happend(ud));
dbg_eh("wakeup\n");
}
}
void usbip_start_eh(struct usbip_device *ud)
{
struct usbip_task *eh = &ud->eh;
init_waitqueue_head(&ud->eh_waitq);
ud->event = 0;
usbip_task_init(eh, "usbip_eh", event_handler_loop);
kernel_thread(usbip_thread, (void *)eh, 0);
wait_for_completion(&eh->thread_done);
}
EXPORT_SYMBOL_GPL(usbip_start_eh);
void usbip_stop_eh(struct usbip_device *ud)
{
struct usbip_task *eh = &ud->eh;
wait_for_completion(&eh->thread_done);
dbg_eh("usbip_eh has finished\n");
}
EXPORT_SYMBOL_GPL(usbip_stop_eh);
void usbip_event_add(struct usbip_device *ud, unsigned long event)
{
spin_lock(&ud->lock);
ud->event |= event;
wake_up(&ud->eh_waitq);
spin_unlock(&ud->lock);
}
EXPORT_SYMBOL_GPL(usbip_event_add);
int usbip_event_happend(struct usbip_device *ud)
{
int happend = 0;
spin_lock(&ud->lock);
if (ud->event != 0)
happend = 1;
spin_unlock(&ud->lock);
return happend;
}
EXPORT_SYMBOL_GPL(usbip_event_happend);
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