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/*
*
* oFono - Open Source Telephony - Android based wakelocks
*
* Copyright (C) 2016 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include <dlfcn.h>
#include <glib.h>
#define OFONO_API_SUBJECT_TO_CHANGE
#include "plugin.h"
#include "log.h"
#include "wakelock.h"
#define ANDROID_WAKELOCK_LOCK_PATH "/sys/power/wake_lock"
#define ANDROID_WAKELOCK_UNLOCK_PATH "/sys/power/wake_unlock"
struct wakelock {
char *name;
unsigned int acquisitions;
};
GSList *locks = NULL;
static int file_exists(char const *filename)
{
struct stat st;
return stat(filename, &st) == 0;
}
static int write_file(const char *file, const char *content)
{
int fd;
unsigned int r = 0;
fd = open(file, O_WRONLY);
if (fd == -1)
return -EIO;
r = write(fd, content, strlen(content));
close(fd);
if (r != strlen(content))
return -EIO;
return 0;
}
static int wakelock_lock(const char *name)
{
return write_file(ANDROID_WAKELOCK_LOCK_PATH, name);
}
static int wakelock_unlock(const char *name)
{
return write_file(ANDROID_WAKELOCK_UNLOCK_PATH, name);
}
static int android_wakelock_acquire(struct wakelock *lock)
{
if (lock == NULL)
return -EINVAL;
if (lock->acquisitions > 0) {
lock->acquisitions++;
return 0;
}
if (wakelock_lock(lock->name) < 0)
return -EIO;
lock->acquisitions++;
return 0;
}
static int android_wakelock_release(struct wakelock *lock)
{
if (lock == NULL)
return -EINVAL;
DBG("lock %p name %s acquisitions %d",
lock, lock->name, lock->acquisitions);
if (!lock->acquisitions) {
ofono_warn("Attempted to release already released lock %s", lock->name);
return -EINVAL;
}
if (lock->acquisitions > 1) {
lock->acquisitions--;
DBG("lock %s released acquisitions %d", lock->name, lock->acquisitions);
return 0;
}
if (wakelock_unlock(lock->name) < 0)
return -EIO;
lock->acquisitions = 0;
DBG("lock %s was released", lock->name);
return 0;
}
static int android_wakelock_create(const char *name, struct wakelock **lock)
{
if (lock == NULL)
return -EINVAL;
*lock = g_new0(struct wakelock, 1);
(*lock)->name = g_strdup(name);
(*lock)->acquisitions = 0;
locks = g_slist_prepend(locks, *lock);
DBG("wakelock %s create", name);
return 0;
}
static int android_wakelock_free(struct wakelock *lock)
{
if (lock == NULL)
return -EINVAL;
if (lock->acquisitions) {
/* Need to force releasing the lock here */
lock->acquisitions = 1;
android_wakelock_release(lock);
}
locks = g_slist_remove(locks, lock);
DBG("Freeing lock %s", lock->name);
g_free(lock->name);
g_free(lock);
return 0;
}
static ofono_bool_t android_wakelock_is_locked(struct wakelock *lock)
{
if (lock == NULL)
return FALSE;
return lock->acquisitions > 0;
}
struct wakelock_table driver = {
.create = android_wakelock_create,
.free = android_wakelock_free,
.acquire = android_wakelock_acquire,
.release = android_wakelock_release,
.is_locked = android_wakelock_is_locked
};
static int android_wakelock_init(void)
{
if (!file_exists(ANDROID_WAKELOCK_LOCK_PATH)) {
ofono_warn("System does not support Android wakelocks.");
return 0;
}
if (wakelock_plugin_register("android-wakelock", &driver) < 0) {
ofono_error("Failed to register wakelock driver");
return -EIO;
}
return 0;
}
static void android_wakelock_exit(void)
{
wakelock_plugin_unregister();
}
OFONO_PLUGIN_DEFINE(android_wakelock, "Android Wakelock driver", VERSION,
OFONO_PLUGIN_PRIORITY_DEFAULT, android_wakelock_init, android_wakelock_exit)
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