1053 lines
24 KiB
C
1053 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/sched.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.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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/*
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* serio_mutex protects entire serio subsystem and is taken every time
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* serio port or driver registered 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 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_subtree(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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dev_warn(&serio->dev,
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"device_bind_driver() failed 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 && error != -EPROBE_DEFER)
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dev_warn(&serio->dev,
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"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_SUBTREE,
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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 struct serio_event *serio_get_event(void)
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{
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struct serio_event *event = NULL;
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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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event = list_first_entry(&serio_event_list,
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struct serio_event, node);
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list_del_init(&event->node);
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}
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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_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(void *object,
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enum serio_event_type type)
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{
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struct serio_event *e, *next;
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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_safe(e, next, &serio_event_list, node) {
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if (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 (type != e->type)
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break;
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list_del_init(&e->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 void serio_handle_event(struct work_struct *work)
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{
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struct serio_event *event;
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mutex_lock(&serio_mutex);
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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_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_SUBTREE:
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serio_reconnect_subtree(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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}
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serio_remove_duplicate_events(event->object, event->type);
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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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static DECLARE_WORK(serio_event_work, serio_handle_event);
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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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pr_err("Not enough memory to queue event %d\n", 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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pr_warn("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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queue_work(system_long_wq, &serio_event_work);
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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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/*
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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 serio_event *event, *next;
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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_safe(event, next, &serio_event_list, node) {
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if (event->object == object) {
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list_del_init(&event->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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* Locate child serio port (if any) that has not been fully registered yet.
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*
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* Children are registered by driver's connect() handler so there can't be a
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* grandchild 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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/*
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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 modalias_show(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 type_show(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 proto_show(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 id_show(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 extra_show(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 ssize_t drvctl_store(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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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_subtree(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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serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
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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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serio_remove_duplicate_events(serio, SERIO_RESCAN_PORT);
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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 = true;
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} else if (!strncmp(buf, "auto", count)) {
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serio->manual_bind = false;
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} else {
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retval = -EINVAL;
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}
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return retval;
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}
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static ssize_t firmware_id_show(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->firmware_id);
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}
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static DEVICE_ATTR_RO(type);
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static DEVICE_ATTR_RO(proto);
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static DEVICE_ATTR_RO(id);
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static DEVICE_ATTR_RO(extra);
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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 const 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 DEVICE_ATTR_RO(modalias);
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static DEVICE_ATTR_WO(drvctl);
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static DEVICE_ATTR(description, S_IRUGO, serio_show_description, NULL);
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static DEVICE_ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode);
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static DEVICE_ATTR_RO(firmware_id);
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static struct attribute *serio_device_attrs[] = {
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&dev_attr_modalias.attr,
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&dev_attr_description.attr,
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&dev_attr_drvctl.attr,
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&dev_attr_bind_mode.attr,
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&dev_attr_firmware_id.attr,
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NULL
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};
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static const struct attribute_group serio_device_attr_group = {
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.attrs = serio_device_attrs,
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};
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static const struct attribute_group *serio_device_attr_groups[] = {
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&serio_id_attr_group,
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&serio_device_attr_group,
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NULL
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};
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static void serio_release_port(struct device *dev)
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{
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struct serio *serio = to_serio_port(dev);
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kfree(serio);
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module_put(THIS_MODULE);
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}
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/*
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* Prepare serio port for registration.
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*/
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static void serio_init_port(struct serio *serio)
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{
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static atomic_t serio_no = ATOMIC_INIT(-1);
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__module_get(THIS_MODULE);
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INIT_LIST_HEAD(&serio->node);
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INIT_LIST_HEAD(&serio->child_node);
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INIT_LIST_HEAD(&serio->children);
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spin_lock_init(&serio->lock);
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mutex_init(&serio->drv_mutex);
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device_initialize(&serio->dev);
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dev_set_name(&serio->dev, "serio%lu",
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(unsigned long)atomic_inc_return(&serio_no));
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serio->dev.bus = &serio_bus;
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serio->dev.release = serio_release_port;
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serio->dev.groups = serio_device_attr_groups;
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if (serio->parent) {
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serio->dev.parent = &serio->parent->dev;
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serio->depth = serio->parent->depth + 1;
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} else
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serio->depth = 0;
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lockdep_set_subclass(&serio->lock, serio->depth);
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}
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/*
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* Complete serio port registration.
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* Driver core will attempt to find appropriate driver for the port.
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*/
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static void serio_add_port(struct serio *serio)
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{
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struct serio *parent = serio->parent;
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int error;
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if (parent) {
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serio_pause_rx(parent);
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list_add_tail(&serio->child_node, &parent->children);
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serio_continue_rx(parent);
|
|
}
|
|
|
|
list_add_tail(&serio->node, &serio_list);
|
|
|
|
if (serio->start)
|
|
serio->start(serio);
|
|
|
|
error = device_add(&serio->dev);
|
|
if (error)
|
|
dev_err(&serio->dev,
|
|
"device_add() failed for %s (%s), error: %d\n",
|
|
serio->phys, serio->name, error);
|
|
}
|
|
|
|
/*
|
|
* serio_destroy_port() completes unregistration process and removes
|
|
* port from the system
|
|
*/
|
|
static void serio_destroy_port(struct serio *serio)
|
|
{
|
|
struct serio *child;
|
|
|
|
while ((child = serio_get_pending_child(serio)) != NULL) {
|
|
serio_remove_pending_events(child);
|
|
put_device(&child->dev);
|
|
}
|
|
|
|
if (serio->stop)
|
|
serio->stop(serio);
|
|
|
|
if (serio->parent) {
|
|
serio_pause_rx(serio->parent);
|
|
list_del_init(&serio->child_node);
|
|
serio_continue_rx(serio->parent);
|
|
serio->parent = NULL;
|
|
}
|
|
|
|
if (device_is_registered(&serio->dev))
|
|
device_del(&serio->dev);
|
|
|
|
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_subtree(struct serio *root)
|
|
{
|
|
struct serio *s = root;
|
|
int error;
|
|
|
|
do {
|
|
error = serio_reconnect_port(s);
|
|
if (!error) {
|
|
/*
|
|
* Reconnect was successful, move on to do the
|
|
* first child.
|
|
*/
|
|
if (!list_empty(&s->children)) {
|
|
s = list_first_entry(&s->children,
|
|
struct serio, child_node);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Either it was a leaf node or reconnect failed and it
|
|
* became a leaf node. Continue reconnecting starting with
|
|
* the next sibling of the parent node.
|
|
*/
|
|
while (s != root) {
|
|
struct serio *parent = s->parent;
|
|
|
|
if (!list_is_last(&s->child_node, &parent->children)) {
|
|
s = list_entry(s->child_node.next,
|
|
struct serio, child_node);
|
|
break;
|
|
}
|
|
|
|
s = parent;
|
|
}
|
|
} while (s != root);
|
|
}
|
|
|
|
/*
|
|
* serio_disconnect_port() unbinds a port from its driver. As a side effect
|
|
* all children ports are unbound and destroyed.
|
|
*/
|
|
static void serio_disconnect_port(struct serio *serio)
|
|
{
|
|
struct serio *s = serio;
|
|
|
|
/*
|
|
* Children ports should be disconnected and destroyed
|
|
* first; we travel the tree in depth-first order.
|
|
*/
|
|
while (!list_empty(&serio->children)) {
|
|
|
|
/* Locate a leaf */
|
|
while (!list_empty(&s->children))
|
|
s = list_first_entry(&s->children,
|
|
struct serio, child_node);
|
|
|
|
/*
|
|
* Prune this leaf node unless it is the one we
|
|
* started with.
|
|
*/
|
|
if (s != serio) {
|
|
struct serio *parent = s->parent;
|
|
|
|
device_release_driver(&s->dev);
|
|
serio_destroy_port(s);
|
|
|
|
s = parent;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
EXPORT_SYMBOL(serio_rescan);
|
|
|
|
void serio_reconnect(struct serio *serio)
|
|
{
|
|
serio_queue_event(serio, NULL, SERIO_RECONNECT_SUBTREE);
|
|
}
|
|
EXPORT_SYMBOL(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);
|
|
}
|
|
EXPORT_SYMBOL(__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);
|
|
}
|
|
EXPORT_SYMBOL(serio_unregister_port);
|
|
|
|
/*
|
|
* Safely unregisters children ports if they are present.
|
|
*/
|
|
void serio_unregister_child_port(struct serio *serio)
|
|
{
|
|
struct serio *s, *next;
|
|
|
|
mutex_lock(&serio_mutex);
|
|
list_for_each_entry_safe(s, next, &serio->children, child_node) {
|
|
serio_disconnect_port(s);
|
|
serio_destroy_port(s);
|
|
}
|
|
mutex_unlock(&serio_mutex);
|
|
}
|
|
EXPORT_SYMBOL(serio_unregister_child_port);
|
|
|
|
|
|
/*
|
|
* Serio driver operations
|
|
*/
|
|
|
|
static ssize_t description_show(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 DRIVER_ATTR_RO(description);
|
|
|
|
static ssize_t bind_mode_show(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 bind_mode_store(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 = true;
|
|
} else if (!strncmp(buf, "auto", count)) {
|
|
serio_drv->manual_bind = false;
|
|
} else {
|
|
retval = -EINVAL;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
static DRIVER_ATTR_RW(bind_mode);
|
|
|
|
static struct attribute *serio_driver_attrs[] = {
|
|
&driver_attr_description.attr,
|
|
&driver_attr_bind_mode.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(serio_driver);
|
|
|
|
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 void serio_driver_remove(struct device *dev)
|
|
{
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
serio_disconnect_driver(serio);
|
|
}
|
|
|
|
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)
|
|
pr_warn("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)
|
|
{
|
|
bool 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 = true;
|
|
|
|
error = driver_register(&drv->driver);
|
|
if (error) {
|
|
pr_err("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 = false;
|
|
error = serio_queue_event(drv, NULL, SERIO_ATTACH_DRIVER);
|
|
if (error) {
|
|
driver_unregister(&drv->driver);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__serio_register_driver);
|
|
|
|
void serio_unregister_driver(struct serio_driver *drv)
|
|
{
|
|
struct serio *serio;
|
|
|
|
mutex_lock(&serio_mutex);
|
|
|
|
drv->manual_bind = true; /* 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);
|
|
}
|
|
EXPORT_SYMBOL(serio_unregister_driver);
|
|
|
|
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);
|
|
}
|
|
|
|
#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);
|
|
|
|
if (serio->firmware_id[0])
|
|
SERIO_ADD_UEVENT_VAR("SERIO_FIRMWARE_ID=%s",
|
|
serio->firmware_id);
|
|
|
|
return 0;
|
|
}
|
|
#undef SERIO_ADD_UEVENT_VAR
|
|
|
|
#ifdef CONFIG_PM
|
|
static int serio_suspend(struct device *dev)
|
|
{
|
|
struct serio *serio = to_serio_port(dev);
|
|
|
|
serio_cleanup(serio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int serio_resume(struct device *dev)
|
|
{
|
|
struct serio *serio = to_serio_port(dev);
|
|
int error = -ENOENT;
|
|
|
|
mutex_lock(&serio->drv_mutex);
|
|
if (serio->drv && serio->drv->fast_reconnect) {
|
|
error = serio->drv->fast_reconnect(serio);
|
|
if (error && error != -ENOENT)
|
|
dev_warn(dev, "fast reconnect failed with error %d\n",
|
|
error);
|
|
}
|
|
mutex_unlock(&serio->drv_mutex);
|
|
|
|
if (error) {
|
|
/*
|
|
* Driver reconnect can take a while, so better let
|
|
* kseriod deal with it.
|
|
*/
|
|
serio_queue_event(serio, NULL, SERIO_RECONNECT_PORT);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops serio_pm_ops = {
|
|
.suspend = serio_suspend,
|
|
.resume = serio_resume,
|
|
.poweroff = serio_suspend,
|
|
.restore = serio_resume,
|
|
};
|
|
#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;
|
|
}
|
|
EXPORT_SYMBOL(serio_open);
|
|
|
|
/* 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);
|
|
}
|
|
EXPORT_SYMBOL(serio_close);
|
|
|
|
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 && device_is_registered(&serio->dev)) {
|
|
serio_rescan(serio);
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&serio->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(serio_interrupt);
|
|
|
|
struct bus_type serio_bus = {
|
|
.name = "serio",
|
|
.drv_groups = serio_driver_groups,
|
|
.match = serio_bus_match,
|
|
.uevent = serio_uevent,
|
|
.probe = serio_driver_probe,
|
|
.remove = serio_driver_remove,
|
|
.shutdown = serio_shutdown,
|
|
#ifdef CONFIG_PM
|
|
.pm = &serio_pm_ops,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL(serio_bus);
|
|
|
|
static int __init serio_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = bus_register(&serio_bus);
|
|
if (error) {
|
|
pr_err("Failed to register serio bus, error: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit serio_exit(void)
|
|
{
|
|
bus_unregister(&serio_bus);
|
|
|
|
/*
|
|
* There should not be any outstanding events but work may
|
|
* still be scheduled so simply cancel it.
|
|
*/
|
|
cancel_work_sync(&serio_event_work);
|
|
}
|
|
|
|
subsys_initcall(serio_init);
|
|
module_exit(serio_exit);
|