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

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Date:	Tue, 1 May 2012 08:35:48 +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

On Mon, Apr 30, 2012 at 08:51:28PM +0200, Benjamin Tissoires wrote:
> On Mon, Apr 30, 2012 at 20:30, Henrik Rydberg <rydberg@...omail.se> wrote:
> >> 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?
> 
> Yes, but I'd rather do the test against either id->product or
> id->driver_data as we may use HID_ANY_ID for vendors specific
> handling. For instance, I had the confirmation from EETI (eGalax) that
> they will always use the same protocol for their usb products, thus
> the same quirks could be handled by HID_DEVICE(BUS_USB,
> HID_GROUP_MULTITOUCH, USB_VENDOR_ID_DWAV, HID_ANY_ID).

Sounds good. I am sending out a fourth version of the patch which will
enable this possibility as well.

On a different note, I wonder why the various slot allocations, sysfs
entries and post-parse settings are done after the device has been
started?

Thanks for testing,
Henrik
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