linux-kernel - [PATCH] hid: Add a hid quirk for input sync override

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Message-Id: <1282640084-19217-1-git-send-email-rydberg@euromail.se>
Date:	Tue, 24 Aug 2010 10:54:44 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Stephane Chatty <chatty@...c.fr>,
	Henrik Rydberg <rydberg@...omail.se>
Subject: [PATCH] hid: Add a hid quirk for input sync override

From: Henrik Rydberg <rydberg@...bit.(none)>

As of lately, HID devices which send per-frame data split over several
HID reports have started to emerge. This patch adds a quirk which
allows the HID driver to take over the input layer synchronization,
and hence the control of the frame boundary.

Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
---
Jiri, Dmitry, Stephane,

No doubt, this is not a final solution, but it serves the purpose of
being able to make existing drivers functional while a satisfactory
solution is being worked out.

Cheers,
Henrik

 drivers/hid/hid-input.c |    3 +++
 include/linux/hid.h     |    1 +
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 69d152e..9d97934 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -656,6 +656,9 @@ void hidinput_report_event(struct hid_device *hid, struct hid_report *report)
 {
 	struct hid_input *hidinput;
 
+	if (hid->quirks & HID_QUIRK_NO_INPUT_SYNC)
+		return;
+
 	list_for_each_entry(hidinput, &hid->inputs, list)
 		input_sync(hidinput->input);
 }
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 895001f..8029883 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -315,6 +315,7 @@ struct hid_item {
 #define HID_QUIRK_FULLSPEED_INTERVAL		0x10000000
 #define HID_QUIRK_NO_INIT_REPORTS		0x20000000
 #define HID_QUIRK_NO_IGNORE			0x40000000
+#define HID_QUIRK_NO_INPUT_SYNC			0x80000000
 
 /*
  * This is the global environment of the parser. This information is
-- 
1.7.1

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