input: enable / disable methods with sysfs entry

Commit Message

[e-mail] Dec. 3, 2009, 10:58 a.m. UTC

None

Patch

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 5d6421b..3cd47b4 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1077,11 +1077,54 @@  static ssize_t input_dev_show_modalias(struct device *dev,
 }
 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 
+static ssize_t input_dev_get_enable(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct input_dev *input_dev = to_input_dev(dev);
+	return sprintf(buf, "%u\n", input_dev->enabled);
+}
+
+static ssize_t input_dev_set_enable(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct input_dev *input_dev = to_input_dev(dev);
+	long i;
+	int ret;
+
+	if (!(input_dev->disable && input_dev->enable))
+		return -ENOSYS;
+
+	ret = strict_strtoul(buf, 0, &i);
+	if (ret)
+		return -EINVAL;
+	i = !!i;
+
+	mutex_lock(&input_dev->mutex);
+	if (input_dev->enabled == i) {
+		mutex_unlock(&input_dev->mutex);
+		return count;
+	}
+	input_dev->enabled = i;
+
+	if (i)
+		input_dev->enable(input_dev);
+	else
+		input_dev->disable(input_dev);
+
+	mutex_unlock(&input_dev->mutex);
+	return count;
+}
+
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, input_dev_get_enable,
+		input_dev_set_enable);
+
 static struct attribute *input_dev_attrs[] = {
 	&dev_attr_name.attr,
 	&dev_attr_phys.attr,
 	&dev_attr_uniq.attr,
 	&dev_attr_modalias.attr,
+	&dev_attr_enable.attr,
 	NULL
 };
 
@@ -1539,6 +1582,8 @@  int input_register_device(struct input_dev *dev)
 		return error;
 	}
 
+	dev->enabled = true;
+
 	list_add_tail(&dev->node, &input_dev_list);
 
 	list_for_each_entry(handler, &input_handler_list, node)
diff --git a/include/linux/input.h b/include/linux/input.h
index db563bb..31b462b 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1057,6 +1057,11 @@  struct ff_effect {
  *	or EV_SND. The device is expected to carry out the requested
  *	action (turn on a LED, play sound, etc.) The call is protected
  *	by @event_lock and must not sleep
+ * @enable: method is called when user wants to enable driver which was
+ *	disabled using disable-method (optional).
+ * @disable: method is called when user wants to temporarily disable the
+ *	driver (example: tell keyboard driver to disable scanning at
+ *	HW level) (optional).
  * @grab: input handle that currently has the device grabbed (via
  *	EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
  *	recipient for all input events coming from the device
@@ -1125,6 +1130,8 @@  struct input_dev {
 	void (*close)(struct input_dev *dev);
 	int (*flush)(struct input_dev *dev, struct file *file);
 	int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
+	int (*enable)(struct input_dev *dev);
+	int (*disable)(struct input_dev *dev);
 
 	struct input_handle *grab;
 
@@ -1133,6 +1140,7 @@  struct input_dev {
 
 	unsigned int users;
 	bool going_away;
+	bool enabled;
 
 	struct device dev;