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/*
* Vibrator Triggers Core
*
* Copyright (C) 2013 HTC Corporation.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/vibtrig.h>
/*
* Singleton of vib_trigger, and a lock to protect this object
*/
static DECLARE_RWSEM(triggers_container_lock);
static struct vib_trigger* trigger_singleton = NULL;
/*
* Singleton of vib_trigger_enabler, and a lock to protect this object
*/
static DECLARE_RWSEM(enabler_container_lock);
static struct vib_trigger_enabler* enabler_singleton = NULL;
/* Simple Vibrator Trigger Interface */
void vib_trigger_enabler_register(struct vib_trigger_enabler *enabler)
{
int err;
init_rwsem(&enabler->trigger_lock);
/* the default place to assign enabler_singleton */
down_write(&enabler_container_lock);
if (enabler_singleton != NULL) {
err = -EEXIST;
} else {
enabler_singleton = enabler;
vib_trigger_set_default(enabler);
err = 0;
}
up_write(&enabler_container_lock);
if(err)
printk(KERN_DEBUG"vibrator trigger file already exist!\n");
printk(KERN_DEBUG
"Registered vibrator trigger enabler: %s\n",
enabler->name);
}
EXPORT_SYMBOL_GPL(vib_trigger_enabler_register);
void vib_trigger_enabler_unregister(struct vib_trigger_enabler *enabler)
{
down_write(&enabler->trigger_lock);
if (enabler->trigger)
vib_trigger_set(enabler, NULL);
up_write(&enabler->trigger_lock);
/* Stop any motion */
enabler->enable(enabler, 0);
down_write(&enabler_container_lock);
enabler_singleton = NULL;
up_write(&enabler_container_lock);
}
EXPORT_SYMBOL_GPL(vib_trigger_enabler_unregister);
/* Caller must ensure enabler->trigger_lock held */
void vib_trigger_set(struct vib_trigger_enabler *enabler, struct vib_trigger *trigger)
{
unsigned long flags;
/* Remove any existing trigger */
if (enabler->trigger) {
write_lock_irqsave(&enabler->trigger->trig_container_lock, flags);
enabler->trigger->enabler = NULL;
write_unlock_irqrestore(&enabler->trigger->trig_container_lock, flags);
enabler->trigger = NULL;
enabler->enable(enabler, 0);
}
/* Bind trigger/enabler */
if (trigger) {
write_lock_irqsave(&trigger->trig_container_lock, flags);
trigger->enabler = enabler;
write_unlock_irqrestore(&trigger->trig_container_lock, flags);
enabler->trigger = trigger;
}
}
EXPORT_SYMBOL_GPL(vib_trigger_set);
void vib_trigger_set_default(struct vib_trigger_enabler *enabler)
{
if (!enabler->default_trigger)
return;
down_read(&triggers_container_lock);
down_write(&enabler->trigger_lock);
if (trigger_singleton != NULL)
if (!strcmp(enabler->default_trigger, trigger_singleton->name)) {
/* name matched */
vib_trigger_set(enabler, trigger_singleton);
}
up_write(&enabler->trigger_lock);
up_read(&triggers_container_lock);
}
EXPORT_SYMBOL_GPL(vib_trigger_set_default);
void vib_trigger_event(struct vib_trigger *trigger, int value)
{
if (!trigger)
return;
read_lock(&trigger->trig_container_lock);
if (trigger->enabler)
trigger->enabler->enable(trigger->enabler, value);
read_unlock(&trigger->trig_container_lock);
}
EXPORT_SYMBOL_GPL(vib_trigger_event);
void vib_trigger_register_simple(const char *name, struct vib_trigger **tp)
{
struct vib_trigger *trigger;
int err;
trigger = kzalloc(sizeof(struct vib_trigger), GFP_KERNEL);
if (trigger) {
trigger->name = name;
rwlock_init(&trigger->trig_container_lock);
trigger->enabler = NULL;
/* the only place to assign trigger_singleton */
down_write(&triggers_container_lock);
if (trigger_singleton != NULL) {
err = -EEXIST;
} else {
trigger_singleton = trigger;
err = 0;
}
up_write(&triggers_container_lock);
if (err == 0) {
/* Register with any vibrator trigger enabler that has this as a default trigger */
down_read(&enabler_container_lock);
if (enabler_singleton != NULL) {
down_write(&enabler_singleton->trigger_lock);
if (!enabler_singleton->trigger && enabler_singleton->default_trigger &&
!strcmp(enabler_singleton->default_trigger, trigger->name))
vib_trigger_set(enabler_singleton, trigger);
up_write(&enabler_singleton->trigger_lock);
}
up_read(&enabler_container_lock);
}
if (err < 0) {
kfree(trigger);
trigger = NULL;
printk(KERN_WARNING
"Vibrator trigger %s failed to register"
" (%d)\n", name, err);
}
} else
printk(KERN_WARNING
"Vibrator trigger %s failed to register"
" (no memory)\n", name);
*tp = trigger;
}
EXPORT_SYMBOL_GPL(vib_trigger_register_simple);
void vib_trigger_unregister_simple(struct vib_trigger *trigger)
{
if (trigger)
{
struct vib_trigger_enabler* enabler;
/* Remove from the Singleton of vib triggers */
down_write(&triggers_container_lock);
trigger_singleton = NULL;
up_write(&triggers_container_lock);
/* Remove anyone actively using this trigger */
enabler = trigger->enabler;
if (enabler) {
down_write(&enabler->trigger_lock);
if (enabler->trigger == trigger)
enabler->trigger = NULL;
up_write(&enabler->trigger_lock);
}
}
kfree(trigger);
}
EXPORT_SYMBOL_GPL(vib_trigger_unregister_simple);
MODULE_AUTHOR("HTC");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Vibrator Triggers Core");
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