RE: [PATCH 1/3] platform/x86: dell-wmi: add new backlight events

[<Mario.Limonciello@dell.com>]

> -----Original Message-----
> From: Y Paritcher <y.linux@paritcher.com>
> Sent: Monday, June 8, 2020 3:12 PM
> To: Limonciello, Mario; pali@kernel.org
> Cc: linux-kernel@vger.kernel.org; platform-driver-x86@vger.kernel.org;
> mjg59@srcf.ucam.org
> Subject: Re: [PATCH 1/3] platform/x86: dell-wmi: add new backlight events
> 
> 
> [EXTERNAL EMAIL]
> 
> On 6/8/20 11:30 AM, Mario.Limonciello@dell.com wrote:
> >> -----Original Message-----
> >> From: platform-driver-x86-owner@vger.kernel.org <platform-driver-x86-
> >> owner@vger.kernel.org> On Behalf Of Pali Rohár
> >> Sent: Monday, June 8, 2020 3:35 AM
> >> To: Y Paritcher
> >> Cc: linux-kernel@vger.kernel.org; platform-driver-x86@vger.kernel.org;
> >> Matthew Garrett
> >> Subject: Re: [PATCH 1/3] platform/x86: dell-wmi: add new backlight
> events
> >>
> >>
> >> [EXTERNAL EMAIL]
> >>
> >> On Monday 08 June 2020 00:22:24 Y Paritcher wrote:
> >>> Ignore events with a type of 0x0010 and a code of 0x57 / 0x58,
> >>> this silences the following messages being logged on a
> >>> Dell Inspiron 5593:
> >>>
> >>> dell_wmi: Unknown key with type 0x0010 and code 0x0057 pressed
> >>> dell_wmi: Unknown key with type 0x0010 and code 0x0058 pressed
> >>>
> >>> Signed-off-by: Y Paritcher <y.linux@paritcher.com>
> >>> ---
> >>>  drivers/platform/x86/dell-wmi.c | 4 ++++
> >>>  1 file changed, 4 insertions(+)
> >>>
> >>> diff --git a/drivers/platform/x86/dell-wmi.c
> b/drivers/platform/x86/dell-
> >> wmi.c
> >>> index c25a4286d766..0b4f72f923cd 100644
> >>> --- a/drivers/platform/x86/dell-wmi.c
> >>> +++ b/drivers/platform/x86/dell-wmi.c
> >>> @@ -252,6 +252,10 @@ static const struct key_entry
> >> dell_wmi_keymap_type_0010[] = {
> >>>  	/* Fn-lock switched to multimedia keys */
> >>>  	{ KE_IGNORE, 0x1, { KEY_RESERVED } },
> >>>
> >>> +	/* Backlight brightness level */
> >>> +	{ KE_KEY,    0x57, { KEY_BRIGHTNESSDOWN } },
> >>> +	{ KE_KEY,    0x58, { KEY_BRIGHTNESSUP } },
> >>> +
> >
> > For these particular events are they emitted by another interface as well
> in this
> > platform?
> >
> > If so they should be KE_IGNORE so you don't end up with double
> notifications to
> > userspace.
> Thank you both for the review,
> This is my first patch so if i am doing something wrong please let me know.
> 
> Both before and after this change they are only emitted once (verified via
> showkeys)
> this is because `dell_wmi_process_key()` calls
> `acpi_video_handles_brightness_key_presses()`
> for brightness events, and `acpi_video_handles_brightness_key_presses()`
> makes sure no duplicate acpi-video events are sent.

That's good to hear that it also filters it, but my opinion is that dell-wmi.c
should also filter it.  So just change KE_KEY to KE_IGNORE like the other events.

> >
> >>>  	/* Keyboard backlight change notification */
> >>>  	{ KE_IGNORE, 0x3f, { KEY_RESERVED } },
> >>
> >> Please, keep codes sorted.
> 
> Will fix
> >>
> >>>
> >>> --
> >>> 2.27.0
> >>>