mirror of https://gitee.com/openkylin/linux.git
1051 lines
25 KiB
C
1051 lines
25 KiB
C
/*
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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/sched.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/freezer.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_child_port);
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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_mutex 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 DEFINE_MUTEX(serio_mutex);
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static LIST_HEAD(serio_list);
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static struct bus_type serio_bus;
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static void serio_add_port(struct serio *serio);
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static int serio_reconnect_port(struct serio *serio);
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static void serio_disconnect_port(struct serio *serio);
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static void serio_reconnect_chain(struct serio *serio);
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static void serio_attach_driver(struct serio_driver *drv);
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static int serio_connect_driver(struct serio *serio, struct serio_driver *drv)
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{
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int retval;
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mutex_lock(&serio->drv_mutex);
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retval = drv->connect(serio, drv);
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mutex_unlock(&serio->drv_mutex);
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return retval;
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}
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static int serio_reconnect_driver(struct serio *serio)
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{
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int retval = -1;
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mutex_lock(&serio->drv_mutex);
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if (serio->drv && serio->drv->reconnect)
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retval = serio->drv->reconnect(serio);
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mutex_unlock(&serio->drv_mutex);
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return retval;
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}
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static void serio_disconnect_driver(struct serio *serio)
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{
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mutex_lock(&serio->drv_mutex);
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if (serio->drv)
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serio->drv->disconnect(serio);
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mutex_unlock(&serio->drv_mutex);
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}
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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 int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
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{
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int error;
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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 (serio_connect_driver(serio, drv)) {
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serio->dev.driver = NULL;
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return -ENODEV;
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}
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error = device_bind_driver(&serio->dev);
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if (error) {
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printk(KERN_WARNING
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"serio: device_bind_driver() failed "
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"for %s (%s) and %s, error: %d\n",
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serio->phys, serio->name,
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drv->description, error);
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serio_disconnect_driver(serio);
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serio->dev.driver = NULL;
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return error;
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}
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}
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return 0;
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}
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static void serio_find_driver(struct serio *serio)
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{
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int error;
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error = device_attach(&serio->dev);
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if (error < 0)
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printk(KERN_WARNING
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"serio: device_attach() failed for %s (%s), error: %d\n",
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serio->phys, serio->name, error);
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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_PORT,
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SERIO_RECONNECT_PORT,
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SERIO_RECONNECT_CHAIN,
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SERIO_REGISTER_PORT,
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SERIO_ATTACH_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 struct task_struct *serio_task;
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static int 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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int retval = 0;
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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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event = kmalloc(sizeof(struct serio_event), GFP_ATOMIC);
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if (!event) {
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printk(KERN_ERR
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"serio: Not enough memory to queue event %d\n",
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event_type);
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retval = -ENOMEM;
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goto out;
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}
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if (!try_module_get(owner)) {
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printk(KERN_WARNING
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"serio: Can't get module reference, dropping event %d\n",
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event_type);
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kfree(event);
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retval = -EINVAL;
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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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out:
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spin_unlock_irqrestore(&serio_event_lock, flags);
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return retval;
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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_event(void)
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{
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struct serio_event *event;
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mutex_lock(&serio_mutex);
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/*
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* Note that we handle only one event here to give swsusp
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* a chance to freeze kseriod thread. Serio events should
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* be pretty rare so we are not concerned about taking
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* performance hit.
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*/
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if ((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_RECONNECT_PORT:
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serio_reconnect_port(event->object);
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break;
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case SERIO_RESCAN_PORT:
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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_RECONNECT_CHAIN:
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serio_reconnect_chain(event->object);
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break;
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case SERIO_ATTACH_DRIVER:
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serio_attach_driver(event->object);
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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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mutex_unlock(&serio_mutex);
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}
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/*
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* Remove all events that have been submitted for a given
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* object, be it serio port or driver.
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*/
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static void serio_remove_pending_events(void *object)
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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 == object) {
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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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set_freezable();
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do {
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serio_handle_event();
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wait_event_freezable(serio_wait,
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kthread_should_stop() || !list_empty(&serio_event_list));
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} while (!kthread_should_stop());
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printk(KERN_DEBUG "serio: kseriod exiting\n");
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return 0;
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}
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/*
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* Serio port operations
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*/
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static ssize_t serio_show_description(struct device *dev, struct device_attribute *attr, char *buf)
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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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static ssize_t serio_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct serio *serio = to_serio_port(dev);
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return sprintf(buf, "serio:ty%02Xpr%02Xid%02Xex%02X\n",
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serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
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}
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static ssize_t serio_show_id_type(struct device *dev, struct device_attribute *attr, char *buf)
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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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static ssize_t serio_show_id_proto(struct device *dev, struct device_attribute *attr, char *buf)
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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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static ssize_t serio_show_id_id(struct device *dev, struct device_attribute *attr, char *buf)
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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.id);
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}
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static ssize_t serio_show_id_extra(struct device *dev, struct device_attribute *attr, char *buf)
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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.extra);
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}
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static DEVICE_ATTR(type, S_IRUGO, serio_show_id_type, NULL);
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static DEVICE_ATTR(proto, S_IRUGO, serio_show_id_proto, NULL);
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static DEVICE_ATTR(id, S_IRUGO, serio_show_id_id, NULL);
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static DEVICE_ATTR(extra, S_IRUGO, serio_show_id_extra, NULL);
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static struct attribute *serio_device_id_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_proto.attr,
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&dev_attr_id.attr,
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&dev_attr_extra.attr,
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NULL
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};
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static struct attribute_group serio_id_attr_group = {
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.name = "id",
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.attrs = serio_device_id_attrs,
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};
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static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct serio *serio = to_serio_port(dev);
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struct device_driver *drv;
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int error;
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error = mutex_lock_interruptible(&serio_mutex);
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if (error)
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return error;
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|
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if (!strncmp(buf, "none", count)) {
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serio_disconnect_port(serio);
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} else if (!strncmp(buf, "reconnect", count)) {
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serio_reconnect_chain(serio);
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} else if (!strncmp(buf, "rescan", count)) {
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serio_disconnect_port(serio);
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serio_find_driver(serio);
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} else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
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serio_disconnect_port(serio);
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error = serio_bind_driver(serio, to_serio_driver(drv));
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put_driver(drv);
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} else {
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error = -EINVAL;
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}
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mutex_unlock(&serio_mutex);
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return error ? error : count;
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}
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static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
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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->manual_bind ? "manual" : "auto");
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}
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static ssize_t serio_set_bind_mode(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct serio *serio = to_serio_port(dev);
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int retval;
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retval = count;
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if (!strncmp(buf, "manual", count)) {
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serio->manual_bind = 1;
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} else if (!strncmp(buf, "auto", count)) {
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serio->manual_bind = 0;
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} else {
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retval = -EINVAL;
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}
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|
|
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return retval;
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}
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|
|
static struct device_attribute serio_device_attrs[] = {
|
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__ATTR(description, S_IRUGO, serio_show_description, NULL),
|
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__ATTR(modalias, S_IRUGO, serio_show_modalias, NULL),
|
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__ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
|
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__ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
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__ATTR_NULL
|
|
};
|
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|
|
|
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static void serio_release_port(struct device *dev)
|
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{
|
|
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);
|
|
|
|
INIT_LIST_HEAD(&serio->node);
|
|
spin_lock_init(&serio->lock);
|
|
mutex_init(&serio->drv_mutex);
|
|
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;
|
|
serio->depth = serio->parent->depth + 1;
|
|
} else
|
|
serio->depth = 0;
|
|
lockdep_set_subclass(&serio->lock, serio->depth);
|
|
}
|
|
|
|
/*
|
|
* Complete serio port registration.
|
|
* Driver core will attempt to find appropriate driver for the port.
|
|
*/
|
|
static void serio_add_port(struct serio *serio)
|
|
{
|
|
int error;
|
|
|
|
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);
|
|
error = device_add(&serio->dev);
|
|
if (error)
|
|
printk(KERN_ERR
|
|
"serio: device_add() failed for %s (%s), error: %d\n",
|
|
serio->phys, serio->name, error);
|
|
else {
|
|
serio->registered = 1;
|
|
error = sysfs_create_group(&serio->dev.kobj, &serio_id_attr_group);
|
|
if (error)
|
|
printk(KERN_ERR
|
|
"serio: sysfs_create_group() failed for %s (%s), error: %d\n",
|
|
serio->phys, serio->name, error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
sysfs_remove_group(&serio->dev.kobj, &serio_id_attr_group);
|
|
device_del(&serio->dev);
|
|
serio->registered = 0;
|
|
}
|
|
|
|
list_del_init(&serio->node);
|
|
serio_remove_pending_events(serio);
|
|
put_device(&serio->dev);
|
|
}
|
|
|
|
/*
|
|
* Reconnect serio port (re-initialize attached device).
|
|
* If reconnect fails (old device is no longer attached or
|
|
* there was no device to begin with) we do full rescan in
|
|
* hope of finding a driver for the port.
|
|
*/
|
|
static int serio_reconnect_port(struct serio *serio)
|
|
{
|
|
int error = serio_reconnect_driver(serio);
|
|
|
|
if (error) {
|
|
serio_disconnect_port(serio);
|
|
serio_find_driver(serio);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Reconnect serio port and all its children (re-initialize attached devices)
|
|
*/
|
|
static void serio_reconnect_chain(struct serio *serio)
|
|
{
|
|
do {
|
|
if (serio_reconnect_port(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;
|
|
|
|
device_release_driver(&s->dev);
|
|
serio_destroy_port(s);
|
|
} while ((s = parent) != serio);
|
|
}
|
|
|
|
/*
|
|
* Ok, no children left, now disconnect this port
|
|
*/
|
|
device_release_driver(&serio->dev);
|
|
}
|
|
|
|
void serio_rescan(struct serio *serio)
|
|
{
|
|
serio_queue_event(serio, NULL, SERIO_RESCAN_PORT);
|
|
}
|
|
|
|
void serio_reconnect(struct serio *serio)
|
|
{
|
|
serio_queue_event(serio, NULL, SERIO_RECONNECT_CHAIN);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
mutex_lock(&serio_mutex);
|
|
serio_disconnect_port(serio);
|
|
serio_destroy_port(serio);
|
|
mutex_unlock(&serio_mutex);
|
|
}
|
|
|
|
/*
|
|
* Safely unregisters child port if one is present.
|
|
*/
|
|
void serio_unregister_child_port(struct serio *serio)
|
|
{
|
|
mutex_lock(&serio_mutex);
|
|
if (serio->child) {
|
|
serio_disconnect_port(serio->child);
|
|
serio_destroy_port(serio->child);
|
|
}
|
|
mutex_unlock(&serio_mutex);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 serio_connect_driver(serio, drv);
|
|
}
|
|
|
|
static int serio_driver_remove(struct device *dev)
|
|
{
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
serio_disconnect_driver(serio);
|
|
return 0;
|
|
}
|
|
|
|
static void serio_cleanup(struct serio *serio)
|
|
{
|
|
mutex_lock(&serio->drv_mutex);
|
|
if (serio->drv && serio->drv->cleanup)
|
|
serio->drv->cleanup(serio);
|
|
mutex_unlock(&serio->drv_mutex);
|
|
}
|
|
|
|
static void serio_shutdown(struct device *dev)
|
|
{
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
serio_cleanup(serio);
|
|
}
|
|
|
|
static void serio_attach_driver(struct serio_driver *drv)
|
|
{
|
|
int error;
|
|
|
|
error = driver_attach(&drv->driver);
|
|
if (error)
|
|
printk(KERN_WARNING
|
|
"serio: driver_attach() failed for %s with error %d\n",
|
|
drv->driver.name, error);
|
|
}
|
|
|
|
int __serio_register_driver(struct serio_driver *drv, struct module *owner, const char *mod_name)
|
|
{
|
|
int manual_bind = drv->manual_bind;
|
|
int error;
|
|
|
|
drv->driver.bus = &serio_bus;
|
|
drv->driver.owner = owner;
|
|
drv->driver.mod_name = mod_name;
|
|
|
|
/*
|
|
* Temporarily disable automatic binding because probing
|
|
* takes long time and we are better off doing it in kseriod
|
|
*/
|
|
drv->manual_bind = 1;
|
|
|
|
error = driver_register(&drv->driver);
|
|
if (error) {
|
|
printk(KERN_ERR
|
|
"serio: driver_register() failed for %s, error: %d\n",
|
|
drv->driver.name, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Restore original bind mode and let kseriod bind the
|
|
* driver to free ports
|
|
*/
|
|
if (!manual_bind) {
|
|
drv->manual_bind = 0;
|
|
error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
|
|
if (error) {
|
|
driver_unregister(&drv->driver);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void serio_unregister_driver(struct serio_driver *drv)
|
|
{
|
|
struct serio *serio;
|
|
|
|
mutex_lock(&serio_mutex);
|
|
|
|
drv->manual_bind = 1; /* so serio_find_driver ignores it */
|
|
serio_remove_pending_events(drv);
|
|
|
|
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);
|
|
mutex_unlock(&serio_mutex);
|
|
}
|
|
|
|
static void serio_set_drv(struct serio *serio, struct serio_driver *drv)
|
|
{
|
|
serio_pause_rx(serio);
|
|
serio->drv = drv;
|
|
serio_continue_rx(serio);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
|
|
#define SERIO_ADD_UEVENT_VAR(fmt, val...) \
|
|
do { \
|
|
int err = add_uevent_var(env, fmt, val); \
|
|
if (err) \
|
|
return err; \
|
|
} while (0)
|
|
|
|
static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct serio *serio;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
serio = to_serio_port(dev);
|
|
|
|
SERIO_ADD_UEVENT_VAR("SERIO_TYPE=%02x", serio->id.type);
|
|
SERIO_ADD_UEVENT_VAR("SERIO_PROTO=%02x", serio->id.proto);
|
|
SERIO_ADD_UEVENT_VAR("SERIO_ID=%02x", serio->id.id);
|
|
SERIO_ADD_UEVENT_VAR("SERIO_EXTRA=%02x", serio->id.extra);
|
|
SERIO_ADD_UEVENT_VAR("MODALIAS=serio:ty%02Xpr%02Xid%02Xex%02X",
|
|
serio->id.type, serio->id.proto, serio->id.id, serio->id.extra);
|
|
|
|
return 0;
|
|
}
|
|
#undef SERIO_ADD_UEVENT_VAR
|
|
|
|
#else
|
|
|
|
static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
#endif /* CONFIG_HOTPLUG */
|
|
|
|
#ifdef CONFIG_PM
|
|
static int serio_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
if (dev->power.power_state.event != state.event) {
|
|
if (state.event == PM_EVENT_SUSPEND)
|
|
serio_cleanup(to_serio_port(dev));
|
|
|
|
dev->power.power_state = state;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int serio_resume(struct device *dev)
|
|
{
|
|
/*
|
|
* Driver reconnect can take a while, so better let kseriod
|
|
* deal with it.
|
|
*/
|
|
if (dev->power.power_state.event != PM_EVENT_ON) {
|
|
dev->power.power_state = PMSG_ON;
|
|
serio_queue_event(to_serio_port(dev), NULL,
|
|
SERIO_RECONNECT_PORT);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
/* called from serio_driver->connect/disconnect methods under serio_mutex */
|
|
int serio_open(struct serio *serio, struct serio_driver *drv)
|
|
{
|
|
serio_set_drv(serio, drv);
|
|
|
|
if (serio->open && serio->open(serio)) {
|
|
serio_set_drv(serio, NULL);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* called from serio_driver->connect/disconnect methods under serio_mutex */
|
|
void serio_close(struct serio *serio)
|
|
{
|
|
if (serio->close)
|
|
serio->close(serio);
|
|
|
|
serio_set_drv(serio, NULL);
|
|
}
|
|
|
|
irqreturn_t serio_interrupt(struct serio *serio,
|
|
unsigned char data, unsigned int dfl)
|
|
{
|
|
unsigned long flags;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
spin_lock_irqsave(&serio->lock, flags);
|
|
|
|
if (likely(serio->drv)) {
|
|
ret = serio->drv->interrupt(serio, data, dfl);
|
|
} else if (!dfl && serio->registered) {
|
|
serio_rescan(serio);
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&serio->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct bus_type serio_bus = {
|
|
.name = "serio",
|
|
.dev_attrs = serio_device_attrs,
|
|
.drv_attrs = serio_driver_attrs,
|
|
.match = serio_bus_match,
|
|
.uevent = serio_uevent,
|
|
.probe = serio_driver_probe,
|
|
.remove = serio_driver_remove,
|
|
.shutdown = serio_shutdown,
|
|
#ifdef CONFIG_PM
|
|
.suspend = serio_suspend,
|
|
.resume = serio_resume,
|
|
#endif
|
|
};
|
|
|
|
static int __init serio_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = bus_register(&serio_bus);
|
|
if (error) {
|
|
printk(KERN_ERR "serio: failed to register serio bus, error: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
serio_task = kthread_run(serio_thread, NULL, "kseriod");
|
|
if (IS_ERR(serio_task)) {
|
|
bus_unregister(&serio_bus);
|
|
error = PTR_ERR(serio_task);
|
|
printk(KERN_ERR "serio: Failed to start kseriod, error: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit serio_exit(void)
|
|
{
|
|
bus_unregister(&serio_bus);
|
|
kthread_stop(serio_task);
|
|
}
|
|
|
|
subsys_initcall(serio_init);
|
|
module_exit(serio_exit);
|