4 files changed, 192 insertions(+)
 create mode 100644 drivers/gpu/drm/drm_input_helper.c
 create mode 100644 include/drm/drm_input_helper.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index fb144617055b..381476b10a9d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig

@@ -79,9 +79,15 @@ config DRM_DEBUG_SELFTEST
 
 	  If in doubt, say "N".
 
+config DRM_INPUT_HELPER
+	def_bool y
+	depends on DRM_KMS_HELPER
+	depends on INPUT

+
 config DRM_KMS_HELPER
 	tristate
 	depends on DRM
+	select DRM_INPUT_HELPER if INPUT
 	help
 	  CRTC helpers for KMS drivers.
 

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 1c41156deb5f..9a6494aa45e6 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile

@@ -56,6 +56,8 @@ drm_kms_helper-y := drm_bridge_connector.o drm_crtc_helper.o drm_dp_helper.o \
 		drm_atomic_state_helper.o drm_damage_helper.o \
 		drm_format_helper.o drm_self_refresh_helper.o drm_rect.o
 
+drm_kms_helper-$(CONFIG_DRM_INPUT_HELPER) += drm_input_helper.o
+
 drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o
 drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
 drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o

diff --git a/drivers/gpu/drm/drm_input_helper.c b/drivers/gpu/drm/drm_input_helper.c
new file mode 100644
index 000000000000..470f90865c7c
--- /dev/null
+++ b/drivers/gpu/drm/drm_input_helper.c

@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Google, Inc.
+ */
+#include <linux/input.h>
+#include <linux/slab.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_input_helper.h>
+
+/**
+ * DOC: overview
+ *
+ * This helper library provides a thin wrapper around input handles, so that
+ * DRM drivers can easily perform domain-specific actions in response to user
+ * activity. e.g., if someone is moving a mouse, we're likely to want to
+ * display something soon, and we should exit panel self-refresh.
+ */
+
+static void drm_input_event(struct input_handle *handle, unsigned int type,
+			    unsigned int code, int value)
+{
+	struct drm_input_handler *handler = handle->handler->private;
+
+	handler->callback(handler);
+}
+
+static int drm_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 = "drm-input-helper";
+
+	error = input_register_handle(handle);
+	if (error)
+		goto err2;
+
+	error = input_open_device(handle);
+	if (error)
+		goto err1;
+
+	return 0;
+
+err1:
+	input_unregister_handle(handle);
+err2:
+	kfree(handle);
+	return error;
+}
+
+static void drm_input_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id drm_input_ids[] = {
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+			 INPUT_DEVICE_ID_MATCH_ABSBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { [BIT_WORD(ABS_MT_POSITION_X)] =
+			    BIT_MASK(ABS_MT_POSITION_X) |
+			    BIT_MASK(ABS_MT_POSITION_Y) },
+	}, /* multi-touch touchscreen */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+		.evbit = { BIT_MASK(EV_ABS) },
+		.absbit = { [BIT_WORD(ABS_X)] = BIT_MASK(ABS_X) }
+
+	}, /* stylus or joystick device */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
+	}, /* pointer (e.g. trackpad, mouse) */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_ESC)] = BIT_MASK(KEY_ESC) },
+	}, /* keyboard */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+			 INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
+	}, /* joysticks not caught by ABS_X above */
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+			 INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
+	}, /* gamepad */
+	{ },
+};
+
+int drm_input_handle_register(struct drm_device *dev,
+			      struct drm_input_handler *handler)
+{
+	int ret;
+
+	if (!handler->callback)
+		return -EINVAL;
+
+	handler->handler.event = drm_input_event;
+	handler->handler.connect = drm_input_connect;
+	handler->handler.disconnect = drm_input_disconnect;
+	handler->handler.name = kasprintf(GFP_KERNEL, "drm-input-helper-%s",
+					  dev_name(dev->dev));
+	if (!handler->handler.name)
+		return -ENOMEM;
+
+	handler->handler.id_table = drm_input_ids;
+	handler->handler.private = handler;
+
+	ret = input_register_handler(&handler->handler);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	kfree(handler->handler.name);
+	return ret;
+}
+EXPORT_SYMBOL(drm_input_handle_register);
+
+void drm_input_handle_unregister(struct drm_input_handler *handler)
+{
+	input_unregister_handler(&handler->handler);
+	kfree(handler->handler.name);
+}
+EXPORT_SYMBOL(drm_input_handle_unregister);

diff --git a/include/drm/drm_input_helper.h b/include/drm/drm_input_helper.h
new file mode 100644
index 000000000000..7904f397b934
--- /dev/null
+++ b/include/drm/drm_input_helper.h

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021 Google, Inc.
+ */
+#ifndef __DRM_INPUT_HELPER_H__
+#define __DRM_INPUT_HELPER_H__
+
+#include <linux/input.h>
+
+struct drm_device;
+
+struct drm_input_handler {
+	/*
+	 * Callback to call for input activity. Will be called in an atomic
+	 * context.