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/*
* $Id: serio.c,v 1.2 2004-03-25 10:37:49 mauro Exp $
*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* The Serio abstraction module
*/
/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*
* Changes:
* 20 Jul. 2003 Daniele Bellucci <bellucda@tiscali.it>
* Minor cleanups.
*/
#include <linuxcomp.h>
#include <linux/stddef.h>
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/suspend.h>
#include <linux/slab.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Serio abstraction core");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(serio_interrupt);
EXPORT_SYMBOL(serio_register_port);
EXPORT_SYMBOL(serio_register_slave_port);
EXPORT_SYMBOL(serio_unregister_port);
EXPORT_SYMBOL(serio_unregister_slave_port);
EXPORT_SYMBOL(serio_register_device);
EXPORT_SYMBOL(serio_unregister_device);
EXPORT_SYMBOL(serio_open);
EXPORT_SYMBOL(serio_close);
EXPORT_SYMBOL(serio_rescan);
struct serio_event {
int type;
struct serio *serio;
struct list_head node;
};
static DECLARE_MUTEX(serio_sem);
static LIST_HEAD(serio_list);
static LIST_HEAD(serio_dev_list);
static LIST_HEAD(serio_event_list);
static int serio_pid;
static void serio_find_dev(struct serio *serio)
{
struct serio_dev *dev;
list_for_each_entry(dev, &serio_dev_list, node) {
if (serio->dev)
break;
if (dev->connect)
dev->connect(serio, dev);
}
}
#define SERIO_RESCAN 1
static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
static DECLARE_COMPLETION(serio_exited);
void serio_handle_events(void)
{
struct list_head *node, *next;
struct serio_event *event;
list_for_each_safe(node, next, &serio_event_list) {
event = container_of(node, struct serio_event, node);
switch (event->type) {
case SERIO_RESCAN :
//!!!down(&serio_sem);
if (event->serio->dev && event->serio->dev->disconnect)
event->serio->dev->disconnect(event->serio);
serio_find_dev(event->serio);
//!!!up(&serio_sem);
break;
default:
break;
}
list_del_init(node);
kfree(event);
}
}
/*
static int serio_thread(void *nothing)
{
lock_kernel();
daemonize("kseriod");
allow_signal(SIGTERM);
do {
serio_handle_events();
wait_event_interruptible(serio_wait, !list_empty(&serio_event_list));
if (current->flags & PF_FREEZE)
refrigerator(PF_IOTHREAD);
} while (!signal_pending(current));
printk(KERN_DEBUG "serio: kseriod exiting\n");
unlock_kernel();
complete_and_exit(&serio_exited, 0);
return 1;
}
*/
void serio_rescan(struct serio *serio)
{
struct serio_event *event;
if (!(event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC)))
return;
event->type = SERIO_RESCAN;
event->serio = serio;
list_add_tail(&event->node, &serio_event_list);
//!!!wake_up(&serio_wait);
}
irqreturn_t serio_interrupt(struct serio *serio,
unsigned char data, unsigned int flags, struct pt_regs *regs)
{
irqreturn_t ret = IRQ_NONE;
if (serio->dev && serio->dev->interrupt) {
ret = serio->dev->interrupt(serio, data, flags, regs);
} else {
if (!flags) {
serio_rescan(serio);
ret = IRQ_HANDLED;
}
}
return ret;
}
void serio_register_port(struct serio *serio)
{
//!!!down(&serio_sem);
list_add_tail(&serio->node, &serio_list);
serio_find_dev(serio);
//!!!up(&serio_sem);
}
/*
* Same as serio_register_port but does not try to acquire serio_sem.
* Should be used when registering a serio from other input device's
* connect() function.
*/
void serio_register_slave_port(struct serio *serio)
{
list_add_tail(&serio->node, &serio_list);
serio_find_dev(serio);
}
void serio_unregister_port(struct serio *serio)
{
//!!!down(&serio_sem);
list_del_init(&serio->node);
if (serio->dev && serio->dev->disconnect)
serio->dev->disconnect(serio);
//!!!up(&serio_sem);
}
/*
* Same as serio_unregister_port but does not try to acquire serio_sem.
* Should be used when unregistering a serio from other input device's
* disconnect() function.
*/
void serio_unregister_slave_port(struct serio *serio)
{
list_del_init(&serio->node);
if (serio->dev && serio->dev->disconnect)
serio->dev->disconnect(serio);
}
void serio_register_device(struct serio_dev *dev)
{
struct serio *serio;
//!!!down(&serio_sem);
list_add_tail(&dev->node, &serio_dev_list);
list_for_each_entry(serio, &serio_list, node)
if (!serio->dev && dev->connect)
dev->connect(serio, dev);
//!!!up(&serio_sem);
}
void serio_unregister_device(struct serio_dev *dev)
{
struct serio *serio;
//!!!down(&serio_sem);
list_del_init(&dev->node);
list_for_each_entry(serio, &serio_list, node) {
if (serio->dev == dev && dev->disconnect)
dev->disconnect(serio);
serio_find_dev(serio);
}
//!!!up(&serio_sem);
}
/* called from serio_dev->connect/disconnect methods under serio_sem */
int serio_open(struct serio *serio, struct serio_dev *dev)
{
serio->dev = dev;
if (serio->open(serio)) {
serio->dev = NULL;
return -1;
}
return 0;
}
/* called from serio_dev->connect/disconnect methods under serio_sem */
void serio_close(struct serio *serio)
{
serio->close(serio);
serio->dev = NULL;
}
/*static*/ int __init serio_init(void)
{
int pid = 1;
//!!!pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL);
if (!pid) {
printk(KERN_WARNING "serio: Failed to start kseriod\n");
return -1;
}
serio_pid = pid;
return 0;
}
/*static*/ void __exit serio_exit(void)
{
//!!!kill_proc(serio_pid, SIGTERM, 1);
wait_for_completion(&serio_exited);
}
module_init(serio_init);
module_exit(serio_exit);