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

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Date:   Mon, 2 Jul 2018 16:13:15 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     AceLan Kao <acelan.kao@...onical.com>
Cc:     Matt Delco <delco@...omium.org>,
        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

On Mon, Jun 25, 2018 at 9:25 AM, AceLan Kao <acelan.kao@...onical.com> wrote:
> Looks good to me
>

Pushed to my review and testing queue, thanks!

> 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
>>



-- 
With Best Regards,
Andy Shevchenko