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path: root/drivers/input/evdev.c
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Diffstat (limited to 'drivers/input/evdev.c')
-rw-r--r--drivers/input/evdev.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index f0f8928b3c8..23425d7922c 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -24,6 +24,7 @@
#include <linux/major.h>
#include <linux/device.h>
#include <linux/cdev.h>
+#include <linux/wakelock.h>
#include "input-compat.h"
struct evdev {
@@ -44,6 +45,9 @@ struct evdev_client {
unsigned int tail;
unsigned int packet_head; /* [future] position of the first element of next packet */
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
+ struct wake_lock wake_lock;
+ bool use_wake_lock;
+ char name[28];
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
@@ -71,10 +75,14 @@ static void __pass_event(struct evdev_client *client,
client->buffer[client->tail].value = 0;
client->packet_head = client->tail;
+ if (client->use_wake_lock)
+ wake_unlock(&client->wake_lock);
}
if (event->type == EV_SYN && event->code == SYN_REPORT) {
client->packet_head = client->head;
+ if (client->use_wake_lock)
+ wake_lock(&client->wake_lock);
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
}
@@ -289,6 +297,8 @@ static int evdev_release(struct inode *inode, struct file *file)
mutex_unlock(&evdev->mutex);
evdev_detach_client(evdev, client);
+ if (client->use_wake_lock)
+ wake_lock_destroy(&client->wake_lock);
kfree(client);
evdev_close_device(evdev);
@@ -320,6 +330,8 @@ static int evdev_open(struct inode *inode, struct file *file)
client->bufsize = bufsize;
spin_lock_init(&client->buffer_lock);
+ snprintf(client->name, sizeof(client->name), "%s-%d",
+ dev_name(&evdev->dev), task_tgid_vnr(current));
client->evdev = evdev;
evdev_attach_client(evdev, client);
@@ -386,6 +398,9 @@ static int evdev_fetch_next_event(struct evdev_client *client,
if (have_event) {
*event = client->buffer[client->tail++];
client->tail &= client->bufsize - 1;
+ if (client->use_wake_lock &&
+ client->packet_head == client->tail)
+ wake_unlock(&client->wake_lock);
}
spin_unlock_irq(&client->buffer_lock);
@@ -674,6 +689,35 @@ static int evdev_handle_mt_request(struct input_dev *dev,
return 0;
}
+static int evdev_enable_suspend_block(struct evdev *evdev,
+ struct evdev_client *client)
+{
+ if (client->use_wake_lock)
+ return 0;
+
+ spin_lock_irq(&client->buffer_lock);
+ wake_lock_init(&client->wake_lock, WAKE_LOCK_SUSPEND, client->name);
+ client->use_wake_lock = true;
+ if (client->packet_head != client->tail)
+ wake_lock(&client->wake_lock);
+ spin_unlock_irq(&client->buffer_lock);
+ return 0;
+}
+
+static int evdev_disable_suspend_block(struct evdev *evdev,
+ struct evdev_client *client)
+{
+ if (!client->use_wake_lock)
+ return 0;
+
+ spin_lock_irq(&client->buffer_lock);
+ client->use_wake_lock = false;
+ wake_lock_destroy(&client->wake_lock);
+ spin_unlock_irq(&client->buffer_lock);
+
+ return 0;
+}
+
static long evdev_do_ioctl(struct file *file, unsigned int cmd,
void __user *p, int compat_mode)
{
@@ -755,6 +799,15 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
case EVIOCSKEYCODE_V2:
return evdev_handle_set_keycode_v2(dev, p);
+
+ case EVIOCGSUSPENDBLOCK:
+ return put_user(client->use_wake_lock, ip);
+
+ case EVIOCSSUSPENDBLOCK:
+ if (p)
+ return evdev_enable_suspend_block(evdev, client);
+ else
+ return evdev_disable_suspend_block(evdev, client);
}
size = _IOC_SIZE(cmd);