2005-04-16 22:20:36 +00:00
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/*
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* The Serio abstraction module
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*
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* Copyright (c) 1999-2004 Vojtech Pavlik
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* Copyright (c) 2004 Dmitry Torokhov
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* Copyright (c) 2003 Daniele Bellucci
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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*/
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/serio.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/completion.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/slab.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Serio abstraction core");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(serio_interrupt);
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EXPORT_SYMBOL(__serio_register_port);
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EXPORT_SYMBOL(serio_unregister_port);
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EXPORT_SYMBOL(__serio_unregister_port_delayed);
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EXPORT_SYMBOL(__serio_register_driver);
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EXPORT_SYMBOL(serio_unregister_driver);
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EXPORT_SYMBOL(serio_open);
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EXPORT_SYMBOL(serio_close);
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EXPORT_SYMBOL(serio_rescan);
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EXPORT_SYMBOL(serio_reconnect);
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/*
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* serio_sem protects entire serio subsystem and is taken every time
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* serio port or driver registrered or unregistered.
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*/
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static DECLARE_MUTEX(serio_sem);
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static LIST_HEAD(serio_list);
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static struct bus_type serio_bus = {
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.name = "serio",
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};
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static void serio_add_port(struct serio *serio);
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static void serio_destroy_port(struct serio *serio);
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static void serio_reconnect_port(struct serio *serio);
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static void serio_disconnect_port(struct serio *serio);
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static int serio_match_port(const struct serio_device_id *ids, struct serio *serio)
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{
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while (ids->type || ids->proto) {
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if ((ids->type == SERIO_ANY || ids->type == serio->id.type) &&
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(ids->proto == SERIO_ANY || ids->proto == serio->id.proto) &&
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(ids->extra == SERIO_ANY || ids->extra == serio->id.extra) &&
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(ids->id == SERIO_ANY || ids->id == serio->id.id))
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return 1;
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ids++;
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}
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return 0;
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}
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/*
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* Basic serio -> driver core mappings
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*/
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static void serio_bind_driver(struct serio *serio, struct serio_driver *drv)
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{
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down_write(&serio_bus.subsys.rwsem);
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if (serio_match_port(drv->id_table, serio)) {
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serio->dev.driver = &drv->driver;
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if (drv->connect(serio, drv)) {
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serio->dev.driver = NULL;
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goto out;
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}
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device_bind_driver(&serio->dev);
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}
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out:
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up_write(&serio_bus.subsys.rwsem);
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}
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static void serio_release_driver(struct serio *serio)
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{
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down_write(&serio_bus.subsys.rwsem);
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device_release_driver(&serio->dev);
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up_write(&serio_bus.subsys.rwsem);
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}
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static void serio_find_driver(struct serio *serio)
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{
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down_write(&serio_bus.subsys.rwsem);
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device_attach(&serio->dev);
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up_write(&serio_bus.subsys.rwsem);
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}
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/*
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* Serio event processing.
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*/
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enum serio_event_type {
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SERIO_RESCAN,
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SERIO_RECONNECT,
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SERIO_REGISTER_PORT,
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SERIO_UNREGISTER_PORT,
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SERIO_REGISTER_DRIVER,
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};
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struct serio_event {
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enum serio_event_type type;
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void *object;
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struct module *owner;
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struct list_head node;
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};
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static DEFINE_SPINLOCK(serio_event_lock); /* protects serio_event_list */
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static LIST_HEAD(serio_event_list);
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static DECLARE_WAIT_QUEUE_HEAD(serio_wait);
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static DECLARE_COMPLETION(serio_exited);
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static int serio_pid;
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static void serio_queue_event(void *object, struct module *owner,
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enum serio_event_type event_type)
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{
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unsigned long flags;
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struct serio_event *event;
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spin_lock_irqsave(&serio_event_lock, flags);
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/*
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* Scan event list for the other events for the same serio port,
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* starting with the most recent one. If event is the same we
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* do not need add new one. If event is of different type we
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* need to add this event and should not look further because
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* we need to preseve sequence of distinct events.
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*/
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list_for_each_entry_reverse(event, &serio_event_list, node) {
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if (event->object == object) {
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if (event->type == event_type)
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goto out;
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break;
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}
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}
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if ((event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC))) {
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if (!try_module_get(owner)) {
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printk(KERN_WARNING "serio: Can't get module reference, dropping event %d\n", event_type);
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goto out;
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}
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event->type = event_type;
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event->object = object;
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event->owner = owner;
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list_add_tail(&event->node, &serio_event_list);
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wake_up(&serio_wait);
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} else {
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printk(KERN_ERR "serio: Not enough memory to queue event %d\n", event_type);
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}
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out:
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spin_unlock_irqrestore(&serio_event_lock, flags);
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}
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static void serio_free_event(struct serio_event *event)
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{
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module_put(event->owner);
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kfree(event);
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}
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static void serio_remove_duplicate_events(struct serio_event *event)
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{
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struct list_head *node, *next;
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struct serio_event *e;
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unsigned long flags;
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spin_lock_irqsave(&serio_event_lock, flags);
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list_for_each_safe(node, next, &serio_event_list) {
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e = list_entry(node, struct serio_event, node);
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if (event->object == e->object) {
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/*
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* If this event is of different type we should not
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* look further - we only suppress duplicate events
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* that were sent back-to-back.
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*/
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if (event->type != e->type)
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break;
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list_del_init(node);
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serio_free_event(e);
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}
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}
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spin_unlock_irqrestore(&serio_event_lock, flags);
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}
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static struct serio_event *serio_get_event(void)
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{
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struct serio_event *event;
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struct list_head *node;
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unsigned long flags;
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spin_lock_irqsave(&serio_event_lock, flags);
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if (list_empty(&serio_event_list)) {
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spin_unlock_irqrestore(&serio_event_lock, flags);
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return NULL;
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}
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node = serio_event_list.next;
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event = list_entry(node, struct serio_event, node);
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list_del_init(node);
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spin_unlock_irqrestore(&serio_event_lock, flags);
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return event;
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}
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static void serio_handle_events(void)
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{
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struct serio_event *event;
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struct serio_driver *serio_drv;
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down(&serio_sem);
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while ((event = serio_get_event())) {
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switch (event->type) {
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case SERIO_REGISTER_PORT:
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serio_add_port(event->object);
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break;
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case SERIO_UNREGISTER_PORT:
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serio_disconnect_port(event->object);
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serio_destroy_port(event->object);
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break;
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case SERIO_RECONNECT:
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serio_reconnect_port(event->object);
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break;
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case SERIO_RESCAN:
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serio_disconnect_port(event->object);
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serio_find_driver(event->object);
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break;
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case SERIO_REGISTER_DRIVER:
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serio_drv = event->object;
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driver_register(&serio_drv->driver);
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break;
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default:
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break;
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}
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serio_remove_duplicate_events(event);
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serio_free_event(event);
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}
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up(&serio_sem);
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}
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/*
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* Remove all events that have been submitted for a given serio port.
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*/
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static void serio_remove_pending_events(struct serio *serio)
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{
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struct list_head *node, *next;
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struct serio_event *event;
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unsigned long flags;
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spin_lock_irqsave(&serio_event_lock, flags);
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list_for_each_safe(node, next, &serio_event_list) {
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event = list_entry(node, struct serio_event, node);
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if (event->object == serio) {
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list_del_init(node);
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serio_free_event(event);
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}
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}
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spin_unlock_irqrestore(&serio_event_lock, flags);
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}
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/*
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* Destroy child serio port (if any) that has not been fully registered yet.
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*
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* Note that we rely on the fact that port can have only one child and therefore
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* only one child registration request can be pending. Additionally, children
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* are registered by driver's connect() handler so there can't be a grandchild
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* pending registration together with a child.
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*/
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static struct serio *serio_get_pending_child(struct serio *parent)
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{
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struct serio_event *event;
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struct serio *serio, *child = NULL;
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unsigned long flags;
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spin_lock_irqsave(&serio_event_lock, flags);
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list_for_each_entry(event, &serio_event_list, node) {
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if (event->type == SERIO_REGISTER_PORT) {
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serio = event->object;
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if (serio->parent == parent) {
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child = serio;
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break;
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}
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}
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}
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spin_unlock_irqrestore(&serio_event_lock, flags);
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return child;
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}
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static int serio_thread(void *nothing)
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{
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lock_kernel();
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daemonize("kseriod");
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allow_signal(SIGTERM);
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do {
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serio_handle_events();
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wait_event_interruptible(serio_wait, !list_empty(&serio_event_list));
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try_to_freeze(PF_FREEZE);
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} while (!signal_pending(current));
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printk(KERN_DEBUG "serio: kseriod exiting\n");
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unlock_kernel();
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complete_and_exit(&serio_exited, 0);
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}
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/*
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* Serio port operations
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*/
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2005-05-17 10:42:58 +00:00
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static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf)
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2005-04-16 22:20:36 +00:00
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{
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struct serio *serio = to_serio_port(dev);
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return sprintf(buf, "%s\n", serio->name);
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}
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2005-05-17 10:42:58 +00:00
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static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf)
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2005-04-16 22:20:36 +00:00
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{
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struct serio *serio = to_serio_port(dev);
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return sprintf(buf, "%02x\n", serio->id.type);
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}
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2005-05-17 10:42:58 +00:00
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static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf)
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2005-04-16 22:20:36 +00:00
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{
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struct serio *serio = to_serio_port(dev);
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return sprintf(buf, "%02x\n", serio->id.proto);
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}
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2005-05-17 10:42:58 +00:00
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static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf)
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2005-04-16 22:20:36 +00:00
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{
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|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
return sprintf(buf, "%02x\n", serio->id.id);
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:42:58 +00:00
|
|
|
static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
return sprintf(buf, "%02x\n", serio->id.extra);
|
|
|
|
}
|
|
|
|
|
2005-05-17 04:53:09 +00:00
|
|
|
static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL);
|
|
|
|
static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL);
|
|
|
|
static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL);
|
|
|
|
static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL);
|
|
|
|
|
|
|
|
static struct attribute *serio_device_id_attrs[] = {
|
|
|
|
&dev_attr_type.attr,
|
|
|
|
&dev_attr_proto.attr,
|
|
|
|
&dev_attr_id.attr,
|
|
|
|
&dev_attr_extra.attr,
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group serio_id_attr_group = {
|
|
|
|
.name = "id",
|
|
|
|
.attrs = serio_device_id_attrs,
|
|
|
|
};
|
|
|
|
|
2005-05-17 10:42:58 +00:00
|
|
|
static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
struct device_driver *drv;
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
retval = down_interruptible(&serio_sem);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
retval = count;
|
|
|
|
if (!strncmp(buf, "none", count)) {
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
} else if (!strncmp(buf, "reconnect", count)) {
|
|
|
|
serio_reconnect_port(serio);
|
|
|
|
} else if (!strncmp(buf, "rescan", count)) {
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
serio_find_driver(serio);
|
|
|
|
} else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
serio_bind_driver(serio, to_serio_driver(drv));
|
|
|
|
put_driver(drv);
|
|
|
|
} else {
|
|
|
|
retval = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
up(&serio_sem);
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:42:58 +00:00
|
|
|
static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
return sprintf(buf, "%s\n", serio->manual_bind ? "manual" : "auto");
|
|
|
|
}
|
|
|
|
|
2005-05-17 10:42:58 +00:00
|
|
|
static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
retval = count;
|
|
|
|
if (!strncmp(buf, "manual", count)) {
|
|
|
|
serio->manual_bind = 1;
|
|
|
|
} else if (!strncmp(buf, "auto", count)) {
|
|
|
|
serio->manual_bind = 0;
|
|
|
|
} else {
|
|
|
|
retval = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct device_attribute serio_device_attrs[] = {
|
|
|
|
__ATTR(description, S_IRUGO, serio_show_description, NULL),
|
|
|
|
__ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
|
|
|
|
__ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
|
|
|
|
__ATTR_NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static void serio_release_port(struct device *dev)
|
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
|
|
|
|
kfree(serio);
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Prepare serio port for registration.
|
|
|
|
*/
|
|
|
|
static void serio_init_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
static atomic_t serio_no = ATOMIC_INIT(0);
|
|
|
|
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
|
|
|
|
spin_lock_init(&serio->lock);
|
|
|
|
init_MUTEX(&serio->drv_sem);
|
|
|
|
device_initialize(&serio->dev);
|
|
|
|
snprintf(serio->dev.bus_id, sizeof(serio->dev.bus_id),
|
|
|
|
"serio%ld", (long)atomic_inc_return(&serio_no) - 1);
|
|
|
|
serio->dev.bus = &serio_bus;
|
|
|
|
serio->dev.release = serio_release_port;
|
|
|
|
if (serio->parent)
|
|
|
|
serio->dev.parent = &serio->parent->dev;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Complete serio port registration.
|
|
|
|
* Driver core will attempt to find appropriate driver for the port.
|
|
|
|
*/
|
|
|
|
static void serio_add_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
if (serio->parent) {
|
|
|
|
serio_pause_rx(serio->parent);
|
|
|
|
serio->parent->child = serio;
|
|
|
|
serio_continue_rx(serio->parent);
|
|
|
|
}
|
|
|
|
|
|
|
|
list_add_tail(&serio->node, &serio_list);
|
|
|
|
if (serio->start)
|
|
|
|
serio->start(serio);
|
|
|
|
device_add(&serio->dev);
|
2005-05-17 04:53:09 +00:00
|
|
|
sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group);
|
2005-04-16 22:20:36 +00:00
|
|
|
serio->registered = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* serio_destroy_port() completes deregistration process and removes
|
|
|
|
* port from the system
|
|
|
|
*/
|
|
|
|
static void serio_destroy_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
struct serio *child;
|
|
|
|
|
|
|
|
child = serio_get_pending_child(serio);
|
|
|
|
if (child) {
|
|
|
|
serio_remove_pending_events(child);
|
|
|
|
put_device(&child->dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (serio->stop)
|
|
|
|
serio->stop(serio);
|
|
|
|
|
|
|
|
if (serio->parent) {
|
|
|
|
serio_pause_rx(serio->parent);
|
|
|
|
serio->parent->child = NULL;
|
|
|
|
serio_continue_rx(serio->parent);
|
|
|
|
serio->parent = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (serio->registered) {
|
2005-05-17 04:53:09 +00:00
|
|
|
sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group);
|
2005-04-16 22:20:36 +00:00
|
|
|
device_del(&serio->dev);
|
|
|
|
list_del_init(&serio->node);
|
|
|
|
serio->registered = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
serio_remove_pending_events(serio);
|
|
|
|
put_device(&serio->dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Reconnect serio port and all its children (re-initialize attached devices)
|
|
|
|
*/
|
|
|
|
static void serio_reconnect_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
do {
|
|
|
|
if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
serio_find_driver(serio);
|
|
|
|
/* Ok, old children are now gone, we are done */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
serio = serio->child;
|
|
|
|
} while (serio);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* serio_disconnect_port() unbinds a port from its driver. As a side effect
|
|
|
|
* all child ports are unbound and destroyed.
|
|
|
|
*/
|
|
|
|
static void serio_disconnect_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
struct serio *s, *parent;
|
|
|
|
|
|
|
|
if (serio->child) {
|
|
|
|
/*
|
|
|
|
* Children ports should be disconnected and destroyed
|
|
|
|
* first, staring with the leaf one, since we don't want
|
|
|
|
* to do recursion
|
|
|
|
*/
|
|
|
|
for (s = serio; s->child; s = s->child)
|
|
|
|
/* empty */;
|
|
|
|
|
|
|
|
do {
|
|
|
|
parent = s->parent;
|
|
|
|
|
|
|
|
serio_release_driver(s);
|
|
|
|
serio_destroy_port(s);
|
|
|
|
} while ((s = parent) != serio);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ok, no children left, now disconnect this port
|
|
|
|
*/
|
|
|
|
serio_release_driver(serio);
|
|
|
|
}
|
|
|
|
|
|
|
|
void serio_rescan(struct serio *serio)
|
|
|
|
{
|
|
|
|
serio_queue_event(serio, NULL, SERIO_RESCAN);
|
|
|
|
}
|
|
|
|
|
|
|
|
void serio_reconnect(struct serio *serio)
|
|
|
|
{
|
|
|
|
serio_queue_event(serio, NULL, SERIO_RECONNECT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Submits register request to kseriod for subsequent execution.
|
|
|
|
* Note that port registration is always asynchronous.
|
|
|
|
*/
|
|
|
|
void __serio_register_port(struct serio *serio, struct module *owner)
|
|
|
|
{
|
|
|
|
serio_init_port(serio);
|
|
|
|
serio_queue_event(serio, owner, SERIO_REGISTER_PORT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Synchronously unregisters serio port.
|
|
|
|
*/
|
|
|
|
void serio_unregister_port(struct serio *serio)
|
|
|
|
{
|
|
|
|
down(&serio_sem);
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
serio_destroy_port(serio);
|
|
|
|
up(&serio_sem);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Submits register request to kseriod for subsequent execution.
|
|
|
|
* Can be used when it is not obvious whether the serio_sem is
|
|
|
|
* taken or not and when delayed execution is feasible.
|
|
|
|
*/
|
|
|
|
void __serio_unregister_port_delayed(struct serio *serio, struct module *owner)
|
|
|
|
{
|
|
|
|
serio_queue_event(serio, owner, SERIO_UNREGISTER_PORT);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Serio driver operations
|
|
|
|
*/
|
|
|
|
|
|
|
|
static ssize_t serio_driver_show_description(struct device_driver *drv, char *buf)
|
|
|
|
{
|
|
|
|
struct serio_driver *driver = to_serio_driver(drv);
|
|
|
|
return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)");
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t serio_driver_show_bind_mode(struct device_driver *drv, char *buf)
|
|
|
|
{
|
|
|
|
struct serio_driver *serio_drv = to_serio_driver(drv);
|
|
|
|
return sprintf(buf, "%s\n", serio_drv->manual_bind ? "manual" : "auto");
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t serio_driver_set_bind_mode(struct device_driver *drv, const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct serio_driver *serio_drv = to_serio_driver(drv);
|
|
|
|
int retval;
|
|
|
|
|
|
|
|
retval = count;
|
|
|
|
if (!strncmp(buf, "manual", count)) {
|
|
|
|
serio_drv->manual_bind = 1;
|
|
|
|
} else if (!strncmp(buf, "auto", count)) {
|
|
|
|
serio_drv->manual_bind = 0;
|
|
|
|
} else {
|
|
|
|
retval = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct driver_attribute serio_driver_attrs[] = {
|
|
|
|
__ATTR(description, S_IRUGO, serio_driver_show_description, NULL),
|
|
|
|
__ATTR(bind_mode, S_IWUSR | S_IRUGO,
|
|
|
|
serio_driver_show_bind_mode, serio_driver_set_bind_mode),
|
|
|
|
__ATTR_NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
static int serio_driver_probe(struct device *dev)
|
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
struct serio_driver *drv = to_serio_driver(dev->driver);
|
|
|
|
|
|
|
|
return drv->connect(serio, drv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int serio_driver_remove(struct device *dev)
|
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
struct serio_driver *drv = to_serio_driver(dev->driver);
|
|
|
|
|
|
|
|
drv->disconnect(serio);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void __serio_register_driver(struct serio_driver *drv, struct module *owner)
|
|
|
|
{
|
|
|
|
drv->driver.bus = &serio_bus;
|
|
|
|
drv->driver.probe = serio_driver_probe;
|
|
|
|
drv->driver.remove = serio_driver_remove;
|
|
|
|
|
|
|
|
serio_queue_event(drv, owner, SERIO_REGISTER_DRIVER);
|
|
|
|
}
|
|
|
|
|
|
|
|
void serio_unregister_driver(struct serio_driver *drv)
|
|
|
|
{
|
|
|
|
struct serio *serio;
|
|
|
|
|
|
|
|
down(&serio_sem);
|
|
|
|
drv->manual_bind = 1; /* so serio_find_driver ignores it */
|
|
|
|
|
|
|
|
start_over:
|
|
|
|
list_for_each_entry(serio, &serio_list, node) {
|
|
|
|
if (serio->drv == drv) {
|
|
|
|
serio_disconnect_port(serio);
|
|
|
|
serio_find_driver(serio);
|
|
|
|
/* we could've deleted some ports, restart */
|
|
|
|
goto start_over;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
driver_unregister(&drv->driver);
|
|
|
|
up(&serio_sem);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
|
|
|
|
{
|
|
|
|
down(&serio->drv_sem);
|
|
|
|
serio_pause_rx(serio);
|
|
|
|
serio->drv = drv;
|
|
|
|
serio_continue_rx(serio);
|
|
|
|
up(&serio->drv_sem);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int serio_bus_match(struct device *dev, struct device_driver *drv)
|
|
|
|
{
|
|
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
struct serio_driver *serio_drv = to_serio_driver(drv);
|
|
|
|
|
|
|
|
if (serio->manual_bind || serio_drv->manual_bind)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return serio_match_port(serio_drv->id_table, serio);
|
|
|
|
}
|
|
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#ifdef CONFIG_HOTPLUG
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#define PUT_ENVP(fmt, val) \
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do { \
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envp[i++] = buffer; \
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length += snprintf(buffer, buffer_size - length, fmt, val); \
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if (buffer_size - length <= 0 || i >= num_envp) \
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return -ENOMEM; \
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length++; \
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buffer += length; \
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} while (0)
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static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
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{
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struct serio *serio;
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int i = 0;
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int length = 0;
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if (!dev)
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return -ENODEV;
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serio = to_serio_port(dev);
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PUT_ENVP("SERIO_TYPE=%02x", serio->id.type);
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PUT_ENVP("SERIO_PROTO=%02x", serio->id.proto);
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PUT_ENVP("SERIO_ID=%02x", serio->id.id);
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PUT_ENVP("SERIO_EXTRA=%02x", serio->id.extra);
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envp[i] = NULL;
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return 0;
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}
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#undef PUT_ENVP
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#else
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static int serio_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_HOTPLUG */
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static int serio_resume(struct device *dev)
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{
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struct serio *serio = to_serio_port(dev);
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if (!serio->drv || !serio->drv->reconnect || serio->drv->reconnect(serio)) {
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/*
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* Driver re-probing can take a while, so better let kseriod
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* deal with it.
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*/
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serio_rescan(serio);
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}
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return 0;
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}
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/* called from serio_driver->connect/disconnect methods under serio_sem */
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int serio_open(struct serio *serio, struct serio_driver *drv)
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{
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serio_set_drv(serio, drv);
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if (serio->open && serio->open(serio)) {
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serio_set_drv(serio, NULL);
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return -1;
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}
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return 0;
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}
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/* called from serio_driver->connect/disconnect methods under serio_sem */
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void serio_close(struct serio *serio)
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{
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if (serio->close)
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serio->close(serio);
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serio_set_drv(serio, NULL);
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}
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irqreturn_t serio_interrupt(struct serio *serio,
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unsigned char data, unsigned int dfl, struct pt_regs *regs)
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{
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unsigned long flags;
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irqreturn_t ret = IRQ_NONE;
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spin_lock_irqsave(&serio->lock, flags);
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if (likely(serio->drv)) {
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ret = serio->drv->interrupt(serio, data, dfl, regs);
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} else if (!dfl && serio->registered) {
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serio_rescan(serio);
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ret = IRQ_HANDLED;
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}
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spin_unlock_irqrestore(&serio->lock, flags);
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return ret;
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}
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static int __init serio_init(void)
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{
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if (!(serio_pid = kernel_thread(serio_thread, NULL, CLONE_KERNEL))) {
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printk(KERN_ERR "serio: Failed to start kseriod\n");
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return -1;
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}
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serio_bus.dev_attrs = serio_device_attrs;
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serio_bus.drv_attrs = serio_driver_attrs;
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serio_bus.match = serio_bus_match;
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serio_bus.hotplug = serio_hotplug;
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serio_bus.resume = serio_resume;
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bus_register(&serio_bus);
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return 0;
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}
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static void __exit serio_exit(void)
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{
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bus_unregister(&serio_bus);
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kill_proc(serio_pid, SIGTERM, 1);
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wait_for_completion(&serio_exited);
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}
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module_init(serio_init);
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module_exit(serio_exit);
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