Input: elan_i2c - Implement inhibit/uninhibit functions.

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 5f0d75a45c80..423f22fded59 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -329,6 +329,86 @@  static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
 	return error;
 }
 
+static int elan_reactivate(struct elan_tp_data *data)
+{
+	struct device *dev = &data->client->dev;
+	int error;
+
+	error = elan_set_power(data, true);
+	if (error)
+		dev_err(dev, "failed to restore power: %d\n", error);
+
+	error = data->ops->sleep_control(data->client, false);
+	if (error) {
+		dev_err(dev,
+			"failed to wake device up: %d\n", error);
+		return error;
+	}
+
+	return error;
+}
+
+static void elan_inhibit(struct input_dev *input_dev)
+{
+	struct elan_tp_data *data = input_get_drvdata(input_dev);
+	struct i2c_client *client = data->client;
+	int error;
+
+	dev_dbg(&client->dev, "inhibiting\n");
+	/*
+	 * We are taking the mutex to make sure sysfs operations are
+	 * complete before we attempt to bring the device into low[er]
+	 * power mode.
+	 */
+	error = mutex_lock_interruptible(&data->sysfs_mutex);
+	if (error)
+		return;
+
+	disable_irq(client->irq);
+
+	error = elan_set_power(data, false);
+	if (error)
+		enable_irq(client->irq);
+
+	mutex_unlock(&data->sysfs_mutex);
+
+}
+
+static void elan_close(struct input_dev *input_dev)
+{
+	if ((input_dev->users) && (!input_dev->inhibited))
+		elan_inhibit(input_dev);
+
+}
+
+static int elan_uninhibit(struct input_dev *input_dev)
+{
+	struct elan_tp_data *data = input_get_drvdata(input_dev);
+	struct i2c_client *client = data->client;
+	int error;
+
+	dev_dbg(&client->dev, "uninhibiting\n");
+	error = mutex_lock_interruptible(&data->sysfs_mutex);
+	if (error)
+		return error;
+
+	error = elan_reactivate(data);
+	if (error == 0)
+		enable_irq(client->irq);
+
+	mutex_unlock(&data->sysfs_mutex);
+
+	return error;
+}
+
+static int elan_open(struct input_dev *input_dev)
+{
+	if ((input_dev->users) && (input_dev->inhibited))
+		return elan_uninhibit(input_dev);
+
+	return 0;
+}
+
 static int elan_query_device_info(struct elan_tp_data *data)
 {
 	int error;
@@ -1175,6 +1255,9 @@  static int elan_setup_input_device(struct elan_tp_data *data)
 				     0, ETP_FINGER_WIDTH * min_width, 0, 0);
 	}
 
+	input->open = elan_open;
+	input->close = elan_close;
+
 	data->input = input;
 
 	return 0;