From 0d1077627288e51b5604f270eae6cf9f5ccd3871 Mon Sep 17 00:00:00 2001 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com> Date: Fri, 17 Oct 2008 15:20:55 -0700 Subject: [PATCH 087/134] Input: Hold wake lock while event queue is not empty. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Allows userspace code to process input events while the device appears to be asleep. Signed-off-by: Arve Hjønnevåg <arve@android.com> --- drivers/input/evdev.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -19,6 +19,7 @@ #include <linux/input.h> #include <linux/major.h> #include <linux/device.h> +#include <linux/wakelock.h> #include "input-compat.h" struct evdev { @@ -43,6 +44,7 @@ struct evdev_client { struct fasync_struct *fasync; struct evdev *evdev; struct list_head node; + struct wake_lock wake_lock; }; static struct evdev *evdev_table[EVDEV_MINORS]; @@ -55,6 +57,7 @@ static void evdev_pass_event(struct evde * Interrupts are disabled, just acquire the lock */ spin_lock(&client->buffer_lock); + wake_lock_timeout(&client->wake_lock, 5 * HZ); client->buffer[client->head++] = *event; client->head &= EVDEV_BUFFER_SIZE - 1; spin_unlock(&client->buffer_lock); @@ -233,6 +236,7 @@ static int evdev_release(struct inode *i mutex_unlock(&evdev->mutex); evdev_detach_client(evdev, client); + wake_lock_destroy(&client->wake_lock); kfree(client); evdev_close_device(evdev); @@ -269,6 +273,7 @@ static int evdev_open(struct inode *inod } spin_lock_init(&client->buffer_lock); + wake_lock_init(&client->wake_lock, WAKE_LOCK_SUSPEND, "evdev"); client->evdev = evdev; evdev_attach_client(evdev, client); @@ -332,6 +337,8 @@ static int evdev_fetch_next_event(struct if (have_event) { *event = client->buffer[client->tail++]; client->tail &= EVDEV_BUFFER_SIZE - 1; + if (client->head == client->tail) + wake_unlock(&client->wake_lock); } spin_unlock_irq(&client->buffer_lock);