linux-kernel - Re: [PATCH v2] platform/x86: intel-vbtn: Add support for dock mode detection

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Date:   Mon, 25 Jun 2018 14:25:27 +0800
From:   AceLan Kao <acelan.kao@...onical.com>
To:     Matt Delco <delco@...omium.org>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH v2] platform/x86: intel-vbtn: Add support for dock mode detection

Looks good to me

Reviewed-By: AceLan Kao <acelan.kao@...onical.com>

2018-06-25 8:29 GMT+08:00 Matt Delco <delco@...omium.org>:
> The Dell laptop I have has an ACPI that sends 0xCB and 0xCC on entering
> tablet mode.  On exiting tablet mode it sends 0xCA and 0xCD. Based on:
>
> http://www.traby.de/medion/DSDT/dsdt.dsl
> https://gist.github.com/jprvita/5737de3cbb670e80973b7d4e51c38ab6
> https://osdn.net/projects/android-x86/scm/git/kernel/commits/
> 7cbe5a330687b851f32dd9f1048a6ce182d0ff44
>
> It appears that 0xCA and 0xCB are about dock mode, which for my
> convertible laptop seems questionably tied to whether I've put
> the laptop in tablet or laptop mode.  I previously proposed no-oping
> 0xCA and 0xCB but this revised change attempts to add support for
> detecting dock mode--this detection will essentially be broken for
> my laptop (the main workaround would be for 0xCA and 0xCB to be used
> to provoke a query of the VGBS method that reports the current dock &
> tablet mode [which is accurately reported on my laptop but based on
> the prior workarounds in the driver it apparently can't be trusted
> for all systems]).
>
> Signed-off-by: Matt Delco <delco@...omium.org>
> Cc: Darren Hart <dvhart@...radead.org>
> Cc: Andy Shevchenko <andy@...radead.org>
> Cc: platform-driver-x86@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/platform/x86/intel-vbtn.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c
> index c13780b8dabb..06cd7e818ed5 100644
> --- a/drivers/platform/x86/intel-vbtn.c
> +++ b/drivers/platform/x86/intel-vbtn.c
> @@ -17,6 +17,7 @@
>
>  /* When NOT in tablet mode, VGBS returns with the flag 0x40 */
>  #define TABLET_MODE_FLAG 0x40
> +#define DOCK_MODE_FLAG   0x80
>
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("AceLan Kao");
> @@ -38,6 +39,8 @@ static const struct key_entry intel_vbtn_keymap[] = {
>         { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },        /* volume-down key release */
>         { KE_KEY,    0xC8, { KEY_ROTATE_LOCK_TOGGLE } },        /* rotate-lock key press */
>         { KE_KEY,    0xC9, { KEY_ROTATE_LOCK_TOGGLE } },        /* rotate-lock key release */
> +       { KE_SW,     0xCA, { .sw = { SW_DOCK, 1 } } },          /* Docked */
> +       { KE_SW,     0xCB, { .sw = { SW_DOCK, 0 } } },          /* Undocked */
>         { KE_SW,     0xCC, { .sw = { SW_TABLET_MODE, 1 } } },   /* Tablet */
>         { KE_SW,     0xCD, { .sw = { SW_TABLET_MODE, 0 } } },   /* Laptop */
>         { KE_END },
> @@ -121,6 +124,8 @@ static void detect_tablet_mode(struct platform_device *device)
>
>         m = !(obj->integer.value & TABLET_MODE_FLAG);
>         input_report_switch(priv->input_dev, SW_TABLET_MODE, m);
> +       m = (obj->integer.value & DOCK_MODE_FLAG) ? 1 : 0;
> +       input_report_switch(priv->input_dev, SW_DOCK, m);
>  out:
>         kfree(vgbs_output.pointer);
>  }
> --
> 2.18.0.rc2.346.g013aa6912e-goog
>