HID: sensor: Custom and Generic sensor support (4a7de051) · Commits · 戴 / test

HID Sensor Spec defines two usage ids for custom sensors HID_USAGE_SENSOR_TYPE_OTHER_CUSTOM (0x09, 0xE1) HID_USAGE_SENSOR_TYPE_OTHER_GENERIC(0x09, 0xE2) In addition the standard also defines usage ids for custom fields. The purpose of these sensors is to extend the functionality or provide a way to obfuscate the data being communicated by a sensor. Without knowing the mapping between the data and its encapsulated form, it is difficult for an driver to determine what data is being communicated by the sensor. This allows some differentiating use cases, where vendor can provide applications. Since these can't be represented by standard sensor interfaces like IIO, we present these as fields with - type (input/output) - units - min/max - get/set value In addition an dev interface to transfer report events. Details about this interface is described in /Documentation/hid/hid-sensor.txt. Manufacturers should not use these ids for any standard sensors, otherwise the the product/vendor id can be added to black list. Signed-off-by:

Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by:

Jonathan Cameron <jic23@kernel.org> Signed-off-by:

Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

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		@@ -885,6 +885,21 @@ config HID_SENSOR_HUB
		for events and handle data streams. Each sensor driver can format
		data and present to user mode using input or IIO interface.

		config HID_SENSOR_CUSTOM_SENSOR
		tristate "HID Sensors hub custom sensor support"
		depends on HID_SENSOR_HUB
		default n
		---help---
		HID Sensor hub specification allows definition of some custom and
		generic sensors. Unlike other HID sensors, they can't be exported
		via Linux IIO because of custom fields. This is up to the manufacturer
		to decide how to interpret these special sensor ids and process in
		the user space. Currently some manufacturers are using these ids for
		sensor calibration and debugging other sensors. Manufacturers
		should't use these special custom sensor ids to export any of the
		standard sensors.
		Select this config option for custom/generic sensor support.

		endmenu

		endif # HID

drivers/hid/Makefile

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		@@ -101,6 +101,7 @@ obj-$(CONFIG_HID_WACOM) += wacom.o
		obj-$(CONFIG_HID_WALTOP) += hid-waltop.o
		obj-$(CONFIG_HID_WIIMOTE) += hid-wiimote.o
		obj-$(CONFIG_HID_SENSOR_HUB) += hid-sensor-hub.o
		obj-$(CONFIG_HID_SENSOR_CUSTOM_SENSOR) += hid-sensor-custom.o

		obj-$(CONFIG_USB_HID) += usbhid/
		obj-$(CONFIG_USB_MOUSE) += usbhid/

drivers/hid/hid-sensor-custom.c

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