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Hans de Goede ebf570042b leds: trigger: audio: Add an activate callback to ensure the initial brightness is set [ Upstream commit `64f67b5240` ] Some 2-in-1s with a detachable (USB) keyboard(dock) have mute-LEDs in the speaker- and/or mic-mute keys on the keyboard. Examples of this are the Lenovo Thinkpad10 tablet (with its USB kbd-dock) and the HP x2 10 series. The detachable nature of these keyboards means that the keyboard and thus the mute LEDs may show up after the user (or userspace restoring old mixer settings) has muted the speaker and/or mic. Current LED-class devices with a default_trigger of "audio-mute" or "audio-micmute" initialize the brightness member of led_classdev with ledtrig_audio_get() before registering the LED. This makes the software state after attaching the keyboard match the actual audio mute state, e.g. cat /sys/class/leds/foo/brightness will show the right value. But before this commit nothing was actually calling the led_classdev's brightness_set[_blocking] callback so the value returned by ledtrig_audio_get() was never actually being sent to the hw, leading to the mute LEDs staying in their default power-on state, after attaching the keyboard, even if ledtrig_audio_get() returned a different state. This could be fixed by having the individual LED drivers call brightness_set[_blocking] themselves after registering the LED, but this really is something which should be done by a led-trigger activate callback. Add an activate callback for this, fixing the issue of the mute LEDs being out of sync after (re)attaching the keyboard. Cc: Takashi Iwai <tiwai@suse.de> Fixes: `faa2541f5b` ("leds: trigger: Introduce audio mute LED trigger") Reviewed-by: Marek Behún <kabel@kernel.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-09-15 09:47:33 +02:00
arch	ARM: dts: meson8b: ec100: Fix the pwm regulator supply properties	2021-09-15 09:47:32 +02:00
block
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:47:29 +02:00
crypto
Documentation
drivers	leds: trigger: audio: Add an activate callback to ensure the initial brightness is set	2021-09-15 09:47:33 +02:00
fs	udf_get_extendedattr() had no boundary checks.	2021-09-15 09:47:28 +02:00
include	bpf: Fix a typo of reuseport map in bpf.h.	2021-09-15 09:47:30 +02:00
init
ipc
kernel	cgroup/cpuset: Fix a partition bug with hotplug	2021-09-15 09:47:32 +02:00
lib	lib/mpi: use kcalloc in mpi_resize	2021-09-15 09:47:29 +02:00
LICENSES
mm	mm/page_alloc: speed up the iteration of max_order	2021-09-12 08:56:41 +02:00
net	net: cipso: fix warnings in netlbl_cipsov4_add_std	2021-09-15 09:47:32 +02:00
samples
scripts
security
sound	ALSA: usb-audio: Add registration quirk for JBL Quantum 800	2021-09-12 08:56:41 +02:00
tools	bpf: Fix a typo of reuseport map in bpf.h.	2021-09-15 09:47:30 +02:00
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Makefile	Linux 5.4.145	2021-09-12 08:56:42 +02:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.