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From 1989dada7ce07848196991c9ebf25ff9c5f14d4e Mon Sep 17 00:00:00 2001
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Date: Tue, 13 Sep 2016 11:52:37 +0200
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Subject: [PATCH] HID: input: ignore System Control application usages if not
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System Controls
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Microsoft is reusing its report descriptor again and again, and part of it
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looks like this:
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0x05, 0x01, // Usage Page (Generic Desktop) 299
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0x09, 0x80, // Usage (System Control) 301
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0xa1, 0x01, // Collection (Application) 303
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0x85, 0x03, // Report ID (3) 305
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0x19, 0x00, // Usage Minimum (0) 307
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0x29, 0xff, // Usage Maximum (255) 309
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0x15, 0x00, // Logical Minimum (0) 311
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0x26, 0xff, 0x00, // Logical Maximum (255) 313
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0x81, 0x00, // Input (Data,Arr,Abs) 316
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0xc0, // End Collection 318
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While there is nothing wrong in term of processing, we do however blindly
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map the full usage range (it's an array) from 0x00 to 0xff, which creates
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some interesting axis, like ABS_X|Y, and a bunch of ABS_MISC + n.
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While libinput and other stacks don't care that much (we can detect them),
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joydev is very happy and attaches itself to the mouse or keyboard.
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The problem is that joydev now handles the device as a joystick, but given
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that we have a HID array, it sets all the ABS_* values to 0. And in its
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world, 0 means -32767 (minimum value), which sends spurious events to games
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(think Steam).
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It looks like hid-microsoft tries to tackle the very same problem with its
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.report_fixup callback. But fixing the report descriptor is an endless task
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and is quite obfuscated.
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So take the hammer, and decide that if the application is meant to be
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System Control, any other usage not in the System Control range should
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be ignored.
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Link: https://bugzilla.redhat.com/show_bug.cgi?id=1325354
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=28912
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Link: https://github.com/ValveSoftware/steam-for-linux/issues/3384
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Link: https://bugzilla.redhat.com/show_bug.cgi?id=1325354
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=37982
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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---
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drivers/hid/hid-input.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
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index bcfaf32..058919d 100644
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--- a/drivers/hid/hid-input.c
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+++ b/drivers/hid/hid-input.c
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@@ -604,6 +604,15 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
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break;
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}
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+ /*
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+ * Some lazy vendors declare 255 usages for System Control,
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+ * leading to the creation of ABS_X|Y axis and too many others.
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+ * It wouldn't be a problem if joydev doesn't consider the
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+ * device as a joystick then.
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+ */
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+ if (field->application == HID_GD_SYSTEM_CONTROL)
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+ goto ignore;
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+
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if ((usage->hid & 0xf0) == 0x90) { /* D-pad */
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switch (usage->hid) {
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case HID_GD_UP: usage->hat_dir = 1; break;
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--
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2.7.4
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