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Commit 30576c5f authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina
Browse files

HID: microsoft: support the Surface Dial 



The tool works nicely with hid-generic, but it ends up creating 9
different input nodes with most of them only having ABS_MISC set.

Filter the axis out, which reduces the amount of devices to 2. One is
the proper System Multi-axis collection, the other exported device
seems to provide SLEEP and POWER Key, not sure how one can trigger
those events though.

Filtering the ABS_X and ABS_Y axes also prevents udev to detect this as
a touchscreen.

Acked-by: default avatarPeter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 08a8a7cf

drivers/hid/hid-microsoft.c

+43 −6
Original line number Diff line number Diff line
@@ -22,12 +22,13 @@ 


#include "hid-ids.h"



#define MS_HIDINPUT		0x01

#define MS_ERGONOMY		0x02

#define MS_PRESENTER		0x04

#define MS_RDESC		0x08

#define MS_NOGET		0x10

#define MS_DUPLICATE_USAGES	0x20

#define MS_HIDINPUT		BIT(0)

#define MS_ERGONOMY		BIT(1)

#define MS_PRESENTER		BIT(2)

#define MS_RDESC		BIT(3)

#define MS_NOGET		BIT(4)

#define MS_DUPLICATE_USAGES	BIT(5)

#define MS_SURFACE_DIAL		BIT(6)



static __u8 *ms_report_fixup(struct hid_device *hdev, __u8 *rdesc,

		unsigned int *rsize)
@@ -130,6 +131,30 @@ static int ms_presenter_8k_quirk(struct hid_input *hi, struct hid_usage *usage, 
	return 1;

}



static int ms_surface_dial_quirk(struct hid_input *hi, struct hid_field *field,

		struct hid_usage *usage, unsigned long **bit, int *max)

{

	switch (usage->hid & HID_USAGE_PAGE) {

	case 0xff070000:

		/* fall-through */

	case HID_UP_DIGITIZER:

		/* ignore those axis */

		return -1;

	case HID_UP_GENDESK:

		switch (usage->hid) {

		case HID_GD_X:

			/* fall-through */

		case HID_GD_Y:

			/* fall-through */

		case HID_GD_RFKILL_BTN:

			/* ignore those axis */

			return -1;

		}

	}



	return 0;

}



static int ms_input_mapping(struct hid_device *hdev, struct hid_input *hi,

		struct hid_field *field, struct hid_usage *usage,

		unsigned long **bit, int *max)
@@ -146,6 +171,13 @@ static int ms_input_mapping(struct hid_device *hdev, struct hid_input *hi, 
			ms_presenter_8k_quirk(hi, usage, bit, max))

		return 1;



	if (quirks & MS_SURFACE_DIAL) {

		int ret = ms_surface_dial_quirk(hi, field, usage, bit, max);



		if (ret)

			return ret;

	}



	return 0;

}
@@ -229,6 +261,9 @@ static int ms_probe(struct hid_device *hdev, const struct hid_device_id *id) 
	if (quirks & MS_NOGET)

		hdev->quirks |= HID_QUIRK_NOGET;



	if (quirks & MS_SURFACE_DIAL)

		hdev->quirks |= HID_QUIRK_INPUT_PER_APP;



	ret = hid_parse(hdev);

	if (ret) {

		hid_err(hdev, "parse failed\n");
@@ -281,6 +316,8 @@ static const struct hid_device_id ms_devices[] = { 


	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_PRESENTER_8K_BT),

		.driver_data = MS_PRESENTER },

	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_MICROSOFT, 0x091B),

		.driver_data = MS_SURFACE_DIAL },

	{ }

};

MODULE_DEVICE_TABLE(hid, ms_devices);