diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2024-05-13 16:46:01 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2024-05-14 11:43:40 +0200 |
| commit | 484bae9e4d6acb5eec39e1ea47f9aa43f11b154d (patch) | |
| tree | 14791048e7134f6830f6870a82c029c7478bec4d /drivers/platform/x86/dell/Kconfig | |
| parent | 9426adb0326a87ed2fa9d010c4c18189047e0c11 (diff) | |
| download | lwn-484bae9e4d6acb5eec39e1ea47f9aa43f11b154d.tar.gz lwn-484bae9e4d6acb5eec39e1ea47f9aa43f11b154d.zip | |
platform/x86: Add new Dell UART backlight driver
Dell All In One (AIO) models released after 2017 use a backlight controller
board connected to an UART.
In DSDT this uart port will be defined as:
Name (_HID, "DELL0501")
Name (_CID, EisaId ("PNP0501")
Instead of having a separate ACPI device with an UartSerialBusV2() resource
to model the backlight-controller, which would be the standard way to do
this.
The acpi_quirk_skip_serdev_enumeration() has special handling for this
and it will make the serial port code create a serdev controller device
for the UART instead of a /dev/ttyS0 char-dev. It will also create
a dell-uart-backlight driver platform device for this driver to bind too.
This new kernel module contains 2 drivers for this:
1. A simple platform driver which creates the actual serdev device
(with the serdev controller device as parent)
2. A serdev driver for the created serdev device which exports
the backlight functionality uses a standard backlight class device.
Reported-by: Roman Bogoyev <roman@computercheck.com.au>
Tested-by: Roman Bogoyev <roman@computercheck.com.au>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Co-developed-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240513144603.93874-2-hdegoede@redhat.com
Diffstat (limited to 'drivers/platform/x86/dell/Kconfig')
| -rw-r--r-- | drivers/platform/x86/dell/Kconfig | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig index bd9f445974cc..195a8bf532cc 100644 --- a/drivers/platform/x86/dell/Kconfig +++ b/drivers/platform/x86/dell/Kconfig @@ -145,6 +145,21 @@ config DELL_SMO8800 To compile this driver as a module, choose M here: the module will be called dell-smo8800. +config DELL_UART_BACKLIGHT + tristate "Dell AIO UART Backlight driver" + depends on ACPI + depends on BACKLIGHT_CLASS_DEVICE + depends on SERIAL_DEV_BUS + help + Say Y here if you want to support Dell AIO UART backlight interface. + The Dell AIO machines released after 2017 come with a UART interface + to communicate with the backlight scalar board. This driver creates + a standard backlight interface and talks to the scalar board through + UART to adjust the AIO screen brightness. + + To compile this driver as a module, choose M here: the module will + be called dell_uart_backlight. + config DELL_WMI tristate "Dell WMI notifications" default m |