linux-kernel - Re: [PATCH v3 5/6] hid-multitouch: Switch to device groups

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Date:	Mon, 30 Apr 2012 20:30:23 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benjamin Tissoires <Benjamin_Tissoires@...itech.com>,
	Stephane Chatty <chatty@...c.fr>
Subject: Re: [PATCH v3 5/6] hid-multitouch: Switch to device groups

> I remarked a small regression in this patch: the detection of the
> serial protocol is not handled anymore. I was indeed relying on the
> fact that the parameter "id" in mt_probe was null to know that the
> device was not already in the list of known devices.

I see. Will this suffice?

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 125c1e7..507981e 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -673,8 +673,8 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
        if (ret)
                goto fail;
 
-       if (!id && td->touches_by_report == 1) {
-               /* the device has been sent by hid-generic */
+       /* unknown serial devices need special quirks */
+       if ((!id || id->product == HID_ANY_ID) && td->touches_by_report == 1) {
                mtclass = &td->mtclass;
                mtclass->quirks |= MT_QUIRK_ALWAYS_VALID;
                mtclass->quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;

Cheers,
Henrik
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