linux-kernel - Re: [PATCH] Support tablet mode switch for Dell laptops

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Date:   Mon, 22 Jan 2018 12:59:19 +0100
From:   Marco Martin <notmart@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Mario.Limonciello@...l.com, pali.rohar@...il.com,
        linux-kernel@...r.kernel.org,
        Matthew Garrett <mjg59@...f.ucam.org>, dvhart@...radead.org,
        andy@...radead.org, Bhushan Shah <bhush94@...il.com>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] Support tablet mode switch for Dell laptops

On Fri, Jan 19, 2018 at 6:29 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>> We discussed a little more on the bug he filed with attached DSDT.  I think that in
>> sparse keymap he can use KE_VSW for the entries and sparse keymap can handle.
>
> No it should be KE_SW I believe, as the "keycode" encodes the state.
> See example in intel-hid.c.
>
> So you probably want:
>
>         ...
>         { KE_SW, 0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Press */
>         { KE_SW, 0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Release */
>
> Thanks.

If I add those lines to intel_vbtn_keymap and remove the two special
cases for 0xCC and 0xCD, it does work, but only if I explicitly call
input_sync(priv->input_dev) after sparse_keymap_report_event()
otherwise i don't get the event (cheching for instance with evtest)
until a sync gets called (i tried to put the sync only for 0xcd and in
that case i get both 0xcc and 0xcd when i go out of tablet mode)
--
Marco Martin