target/linux/goldfish/patches-2.6.30/0087-Input-Hold-wake-lock-while-event-queue-is-not-empty.patch

   1 From 0d1077627288e51b5604f270eae6cf9f5ccd3871 Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
   3 Date: Fri, 17 Oct 2008 15:20:55 -0700
   4 Subject: [PATCH 087/134] Input: Hold wake lock while event queue is not empty.
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=utf-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Allows userspace code to process input events while
  10 the device appears to be asleep.
  11
  12 Signed-off-by: Arve Hjønnevåg <arve@android.com>
  13 ---
  14  drivers/input/evdev.c |    7 +++++++
  15  1 files changed, 7 insertions(+), 0 deletions(-)
  16
  17 --- a/drivers/input/evdev.c
  18 +++ b/drivers/input/evdev.c
  19 @@ -19,6 +19,7 @@
  20  #include <linux/input.h>
  21  #include <linux/major.h>
  22  #include <linux/device.h>
  23 +#include <linux/wakelock.h>
  24  #include "input-compat.h"
  25
  26  struct evdev {
  27 @@ -43,6 +44,7 @@ struct evdev_client {
  28         struct fasync_struct *fasync;
  29         struct evdev *evdev;
  30         struct list_head node;
  31 +       struct wake_lock wake_lock;
  32  };
  33
  34  static struct evdev *evdev_table[EVDEV_MINORS];
  35 @@ -55,6 +57,7 @@ static void evdev_pass_event(struct evde
  36          * Interrupts are disabled, just acquire the lock
  37          */
  38         spin_lock(&client->buffer_lock);
  39 +       wake_lock_timeout(&client->wake_lock, 5 * HZ);
  40         client->buffer[client->head++] = *event;
  41         client->head &= EVDEV_BUFFER_SIZE - 1;
  42         spin_unlock(&client->buffer_lock);
  43 @@ -233,6 +236,7 @@ static int evdev_release(struct inode *i
  44         mutex_unlock(&evdev->mutex);
  45
  46         evdev_detach_client(evdev, client);
  47 +       wake_lock_destroy(&client->wake_lock);
  48         kfree(client);
  49
  50         evdev_close_device(evdev);
  51 @@ -269,6 +273,7 @@ static int evdev_open(struct inode *inod
  52         }
  53
  54         spin_lock_init(&client->buffer_lock);
  55 +       wake_lock_init(&client->wake_lock, WAKE_LOCK_SUSPEND, "evdev");
  56         client->evdev = evdev;
  57         evdev_attach_client(evdev, client);
  58
  59 @@ -332,6 +337,8 @@ static int evdev_fetch_next_event(struct
  60         if (have_event) {
  61                 *event = client->buffer[client->tail++];
  62                 client->tail &= EVDEV_BUFFER_SIZE - 1;
  63 +               if (client->head == client->tail)
  64 +                       wake_unlock(&client->wake_lock);
  65         }
  66
  67         spin_unlock_irq(&client->buffer_lock);