Blob Blame Raw
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7c237e6..80f1e48 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -88,19 +88,26 @@ static int input_defuzz_abs_event(int value, int old_val, int fuzz)
  */
 static void input_pass_event(struct input_dev *dev,
 			     unsigned int type, unsigned int code, int value)
-{
-	struct input_handle *handle;
+
+{	struct input_handle *handle;
 
 	rcu_read_lock();
 
 	handle = rcu_dereference(dev->grab);
-	if (handle)
+	if (handle) {
 		handle->handler->event(handle, type, code, value);
-	else
-		list_for_each_entry_rcu(handle, &dev->h_list, d_node)
-			if (handle->open)
-				handle->handler->event(handle,
-							type, code, value);
+		goto out;
+	}
+
+	handle = rcu_dereference(dev->filter);
+	if (handle && handle->handler->filter(handle, type, code, value))
+		goto out;
+
+	list_for_each_entry_rcu(handle, &dev->h_list, d_node)
+		if (handle->open)
+			handle->handler->event(handle,
+					       type, code, value);
+out:
 	rcu_read_unlock();
 }
 
@@ -375,12 +382,15 @@ int input_grab_device(struct input_handle *handle)
 }
 EXPORT_SYMBOL(input_grab_device);
 
-static void __input_release_device(struct input_handle *handle)
+static void __input_release_device(struct input_handle *handle, bool filter)
 {
 	struct input_dev *dev = handle->dev;
 
-	if (dev->grab == handle) {
-		rcu_assign_pointer(dev->grab, NULL);
+	if (handle == (filter ? dev->filter : dev->grab)) {
+		if (filter)
+			rcu_assign_pointer(dev->filter, NULL);
+		else
+			rcu_assign_pointer(dev->grab, NULL);
 		/* Make sure input_pass_event() notices that grab is gone */
 		synchronize_rcu();
 
@@ -404,12 +414,65 @@ void input_release_device(struct input_handle *handle)
 	struct input_dev *dev = handle->dev;
 
 	mutex_lock(&dev->mutex);
-	__input_release_device(handle);
+	__input_release_device(handle, false);
 	mutex_unlock(&dev->mutex);
 }
 EXPORT_SYMBOL(input_release_device);
 
 /**
+ * input_filter_device - allow input events to be filtered from higher layers
+ * @handle: input handle that wants to filter the device
+ *
+ * When a device is filtered by an input handle all events generated by
+ * the device are to this handle. If the filter function returns true then
+ * the event is discarded rather than being passed to any other input handles,
+ * otherwise it is passed to them as normal. Grabs will be handled before
+ * filters, so a grabbed device will not deliver events to a filter function.
+ */
+int input_filter_device(struct input_handle *handle)
+{
+	struct input_dev *dev = handle->dev;
+	int retval;
+
+	retval = mutex_lock_interruptible(&dev->mutex);
+	if (retval)
+		return retval;
+
+	if (dev->filter) {
+		retval = -EBUSY;
+		goto out;
+	}
+
+	rcu_assign_pointer(dev->filter, handle);
+	synchronize_rcu();
+
+ out:
+	mutex_unlock(&dev->mutex);
+	return retval;
+}
+EXPORT_SYMBOL(input_filter_device);
+
+/**
+ * input_unfilter_device - removes a filter from a device
+ * @handle: input handle that owns the device
+ *
+ * Removes the filter from a device so that other input handles can
+ * start receiving unfiltered input events. Upon release all handlers
+ * attached to the device have their start() method called so they
+ * have a change to synchronize device state with the rest of the
+ * system.
+ */
+void input_unfilter_device(struct input_handle *handle)
+{
+	struct input_dev *dev = handle->dev;
+
+	mutex_lock(&dev->mutex);
+	__input_release_device(handle, true);
+	mutex_unlock(&dev->mutex);
+}
+EXPORT_SYMBOL(input_unfilter_device);
+
+/**
  * input_open_device - open input device
  * @handle: handle through which device is being accessed
  *
@@ -482,7 +545,9 @@ void input_close_device(struct input_handle *handle)
 
 	mutex_lock(&dev->mutex);
 
-	__input_release_device(handle);
+	/* Release both grabs and filters */
+	__input_release_device(handle, false);
+	__input_release_device(handle, true);
 
 	if (!--dev->users && dev->close)
 		dev->close(dev);
diff --git a/include/linux/input.h b/include/linux/input.h
index 8b3bc3e..e28f116 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1118,6 +1118,7 @@ struct input_dev {
 	int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
 
 	struct input_handle *grab;
+	struct input_handle *filter;
 
 	spinlock_t event_lock;
 	struct mutex mutex;
@@ -1218,6 +1219,7 @@ struct input_handler {
 	void *private;
 
 	void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
+	bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
 	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
 	void (*disconnect)(struct input_handle *handle);
 	void (*start)(struct input_handle *handle);
@@ -1295,6 +1297,9 @@ void input_unregister_handle(struct input_handle *);
 int input_grab_device(struct input_handle *);
 void input_release_device(struct input_handle *);
 
+int input_filter_device(struct input_handle *);
+void input_unfilter_device(struct input_handle *);
+
 int input_open_device(struct input_handle *);
 void input_close_device(struct input_handle *);
 
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 74909c4..71a4149 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -22,6 +22,7 @@
 #include <linux/rfkill.h>
 #include <linux/power_supply.h>
 #include <linux/acpi.h>
+#include <linux/input.h>
 #include "../../firmware/dcdbas.h"
 
 #define BRIGHTNESS_TOKEN 0x7d
@@ -206,6 +207,16 @@ static const struct rfkill_ops dell_rfkill_ops = {
 	.query = dell_rfkill_query,
 };
 
+static void dell_rfkill_update(void)
+{
+	if (wifi_rfkill)
+		dell_rfkill_query(wifi_rfkill, (void *)1);
+	if (bluetooth_rfkill)
+		dell_rfkill_query(bluetooth_rfkill, (void *)2);
+	if (wwan_rfkill)
+		dell_rfkill_query(wwan_rfkill, (void *)3);
+}
+
 static int dell_setup_rfkill(void)
 {
 	struct calling_interface_buffer buffer;
@@ -310,6 +321,90 @@ static struct backlight_ops dell_ops = {
 	.update_status  = dell_send_intensity,
 };
 
+static const struct input_device_id dell_input_ids[] = {
+	{
+		.bustype = 0x11,
+		.vendor = 0x01,
+		.product = 0x01,
+		.version = 0xab41,
+		.flags = INPUT_DEVICE_ID_MATCH_BUS |
+			 INPUT_DEVICE_ID_MATCH_VENDOR |
+			 INPUT_DEVICE_ID_MATCH_PRODUCT |
+			 INPUT_DEVICE_ID_MATCH_VERSION
+	},
+	{ },
+};
+
+static bool dell_input_filter(struct input_handle *handle, unsigned int type,
+			     unsigned int code, int value)
+{
+	if (type == EV_KEY && code == KEY_WLAN && value == 1) {
+		dell_rfkill_update();
+		return 1;
+	}
+
+	return 0;
+}
+
+static void dell_input_event(struct input_handle *handle, unsigned int type,
+			     unsigned int code, int value)
+{
+}
+
+static int dell_input_connect(struct input_handler *handler,
+			      struct input_dev *dev,
+			      const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "dell-laptop";
+
+	error = input_register_handle(handle);
+	if (error)
+		goto err_free_handle;
+
+	error = input_open_device(handle);
+	if (error)
+		goto err_unregister_handle;
+
+	error = input_filter_device(handle);
+	if (error)
+		goto err_close_handle;
+
+	return 0;
+
+err_close_handle:
+	input_close_device(handle);
+err_unregister_handle:
+	input_unregister_handle(handle);
+err_free_handle:
+	kfree(handle);
+	return error;
+}
+
+static void dell_input_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static struct input_handler dell_input_handler = {
+	.name = "dell-laptop",
+	.filter = dell_input_filter,
+	.event = dell_input_event,
+	.connect = dell_input_connect,
+	.disconnect = dell_input_disconnect,
+	.id_table = dell_input_ids,
+};
+
 static int __init dell_init(void)
 {
 	struct calling_interface_buffer buffer;
@@ -333,6 +428,10 @@ static int __init dell_init(void)
 		goto out;
 	}
 
+	if (input_register_handler(&dell_input_handler))
+		printk(KERN_INFO
+		       "dell-laptop: Could not register input filter\n");
+
 #ifdef CONFIG_ACPI
 	/* In the event of an ACPI backlight being available, don't
 	 * register the platform controller.
@@ -388,6 +487,7 @@ static void __exit dell_exit(void)
 		rfkill_unregister(bluetooth_rfkill);
 	if (wwan_rfkill)
 		rfkill_unregister(wwan_rfkill);
+	input_unregister_handler(&dell_input_handler);
 }
 
 module_init(dell_init);
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 71a4149..e559fa1 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -198,8 +198,8 @@ static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 	dell_send_request(&buffer, 17, 11);
 	status = buffer.output[1];
 
-	if (status & BIT(bit))
-		rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
+	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
+	rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 }
 
 static const struct rfkill_ops dell_rfkill_ops = {
-- 
1.6.3.3