kernel/linux.git/drivers/platform/loongarch, branch v6.12.80

platform/loongarch: laptop: Add backlight power control support

2025-06-27T10:11:37+00:00

commit 53c762b47f726e4079a1f06f684bce2fc0d56fba upstream. loongson_laptop_turn_{on,off}_backlight() are designed for controlling the power of the backlight, but they aren't really used in the driver previously. Unify these two functions since they only differ in arguments passed to ACPI method, and wire up loongson_laptop_backlight_update() to update the power state of the backlight as well. Tested on the TongFang L860-T2 Loongson-3A5000 laptop. Cc: stable@vger.kernel.org Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver") Signed-off-by: Yao Zi Signed-off-by: Huacai Chen Signed-off-by: Greg Kroah-Hartman

platform/loongarch: laptop: Unregister generic_sub_drivers on exit

2025-06-27T10:11:37+00:00

commit f78fb2576f22b0ba5297412a9aa7691920666c41 upstream. Without correct unregisteration, ACPI notify handlers and the platform drivers installed by generic_subdriver_init() will become dangling references after removing the loongson_laptop module, triggering various kernel faults when a hotkey is sent or at kernel shutdown. Cc: stable@vger.kernel.org Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver") Signed-off-by: Yao Zi Signed-off-by: Huacai Chen Signed-off-by: Greg Kroah-Hartman

platform/loongarch: laptop: Get brightness setting from EC on probe

2025-06-27T10:11:36+00:00

commit 1205088fd0393bd9eae96b62bf1e4b9eb1b73edf upstream. Previously during driver probe, 1 is unconditionally taken as current brightness value and set to props.brightness, which will be considered as the brightness before suspend and restored to EC on resume. Since a brightness value of 1 almost never matches EC's state on coldboot (my laptop's EC defaults to 80), this causes surprising changes of screen brightness on the first time of resume after coldboot. Let's get brightness from EC and take it as the current brightness on probe of the laptop driver to avoid the surprising behavior. Tested on TongFang L860-T2 Loongson-3A5000 laptop. Cc: stable@vger.kernel.org Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver") Signed-off-by: Yao Zi Signed-off-by: Huacai Chen Signed-off-by: Greg Kroah-Hartman

platform/loongarch: laptop: Fix possible UAF and simplify generic_acpi_laptop_init()

2022-10-29T08:29:31+00:00

Currently the return value of 'sub_driver->init' is not checked. If sparse_keymap_setup() called in the init function fails, 'generic_ inputdev' is freed, then it will lead a UAF when using it in generic_ acpi_laptop_init(). Fix it by checking the return value and setting generic_inputdev to NULL after free, so as to avoid double free it. The error code in generic_subdriver_init() is always negative, so the return of generic_subdriver_init() can be simplified. Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver") Signed-off-by: Yang Yingliang Signed-off-by: Huacai Chen

platform/loongarch: laptop: Adjust resume order for loongson_hotkey_resume()

2022-10-29T08:29:31+00:00

Some laptops don't support SW_LID, but still have backlight control, move backlight resuming before SW_LID event handling so as to avoid backlight mistake due to early return. Signed-off-by: Huacai Chen

LoongArch: Add ACPI-based generic laptop driver

2022-10-12T08:36:20+00:00

This add ACPI-based generic laptop driver for Loongson-3. Some of the codes are derived from drivers/platform/x86/thinkpad_acpi.c. Signed-off-by: Jianmin Lv Signed-off-by: Huacai Chen