kernel/linux.git/drivers/video/backlight, branch master

backlight: apple_bl: Convert to a platform driver

2026-03-31T10:48:10+00:00

In all cases in which a struct acpi_driver is used for binding a driver to an ACPI device object, a corresponding platform device is created by the ACPI core and that device is regarded as a proper representation of underlying hardware. Accordingly, a struct platform_driver should be used by driver code to bind to that device. There are multiple reasons why drivers should not bind directly to ACPI device objects [1]. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the Apple Backlight ACPI driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Link: https://lore.kernel.org/all/2396510.ElGaqSPkdT@rafael.j.wysocki/ [1] Signed-off-by: Rafael J. Wysocki Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/5084777.GXAFRqVoOG@rafael.j.wysocki Signed-off-by: Lee Jones

backlight: sky81452-backlight: Check return value of devm_gpiod_get_optional() in sky81452_bl_parse_dt()

2026-03-06T14:21:07+00:00

The devm_gpiod_get_optional() function may return an ERR_PTR in case of genuine GPIO acquisition errors, not just NULL which indicates the legitimate absence of an optional GPIO. Add an IS_ERR() check after the call in sky81452_bl_parse_dt(). On error, return the error code to ensure proper failure handling rather than proceeding with invalid pointers. Fixes: e1915eec54a6 ("backlight: sky81452: Convert to GPIO descriptors") Signed-off-by: Chen Ni Reviewed-by: Linus Walleij Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260203021625.578678-1-nichen@iscas.ac.cn Signed-off-by: Lee Jones

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

backlight: qcom-wled: Change PM8950 WLED configurations

2026-02-04T10:26:03+00:00

PMI8950 WLED needs same configurations as PMI8994 WLED. Fixes: 10258bf4534b ("backlight: qcom-wled: Add PMI8950 compatible") Signed-off-by: Barnabás Czémán Reviewed-by: Konrad Dybcio Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260116-pmi8950-wled-v3-4-e6c93de84079@mainlining.org Signed-off-by: Lee Jones

backlight: qcom-wled: Support ovp values for PMI8994

2026-02-04T10:25:03+00:00

WLED4 found in PMI8994 supports different ovp values. Fixes: 6fc632d3e3e0 ("video: backlight: qcom-wled: Add PMI8994 compatible") Signed-off-by: Barnabás Czémán Reviewed-by: Konrad Dybcio Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260116-pmi8950-wled-v3-2-e6c93de84079@mainlining.org Signed-off-by: Lee Jones

backlight: aw99706: Fix build errors caused by wrong gpio header

2026-01-20T16:07:48+00:00

The driver uses GPIO descriptor API (devm_gpiod_get, gpiod_set_value_cansleep, GPIOD_OUT_LOW) but includes the legacy header instead of . When CONFIG_GPIOLIB is not set, does not include , causing build errors: error: implicit declaration of function 'gpiod_set_value_cansleep' error: implicit declaration of function 'devm_gpiod_get' error: 'GPIOD_OUT_LOW' undeclared Fix by including the correct header . Fixes: 147b38a5ad06 ("backlight: aw99706: Add support for Awinic AW99706 backlight") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202512171631.uKXlYwqu-lkp@intel.com/ Signed-off-by: Junjie Cao Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20260111130117.5041-1-junjie.cao@intel.com Signed-off-by: Lee Jones

backlight: Add Congatec Board Controller (CGBC) backlight support

2026-01-08T11:15:00+00:00

This driver provides backlight brightness control through the Linux backlight subsystem. It communicates with the board controller to adjust LCD backlight using PWM signals. Communication is done through Congatec Board Controller core driver. Tested-by: Thomas Richard Reviewed-by: Thomas Richard Reviewed-by: Daniel Thompson (RISCstar) Signed-off-by: Petri Karhula Link: https://patch.msgid.link/20251205-cgbc-backlight-v6-1-e4175b0bf406@novatron.fi Signed-off-by: Lee Jones

backlight: aw99706: Fix unused function warnings from suspend/resume ops

2025-11-27T08:34:21+00:00

When building for a platform without CONFIG_PM_SLEEP, such as s390, there are two unused function warnings: drivers/video/backlight/aw99706.c:436:12: error: 'aw99706_resume' defined but not used [-Werror=unused-function] 436 | static int aw99706_resume(struct device *dev) | ^~~~~~~~~~~~~~ drivers/video/backlight/aw99706.c:429:12: error: 'aw99706_suspend' defined but not used [-Werror=unused-function] 429 | static int aw99706_suspend(struct device *dev) | ^~~~~~~~~~~~~~~ SET_SYSTEM_SLEEP_PM_OPS, used within SIMPLE_DEV_PM_OPS, expands to nothing when CONFIG_PM_SLEEP is not set, so these functions are completely unused in this configuration. SIMPLE_DEV_PM_OPS is deprecated in favor of DEFINE_SIMPLE_DEV_PM_OPS, which avoids this issue by using pm_sleep_ptr to make these callbacks NULL when CONFIG_PM_SLEEP is unset while making the callback functions always appear used to the compiler regardless of configuration. Switch to DEFINE_SIMPLE_DEV_PM_OPS for aw99706_pm_ops to clear up the warning. Additionally, wrap the pointer to aw99706_pm_ops in pm_ptr() in aw99706_i2c_driver to ensure that the structure is completely eliminated in configurations without CONFIG_PM. Fixes: 88a8e9b49ee8 ("backlight: aw99706: Add support for Awinic AW99706 backlight") Signed-off-by: Nathan Chancellor Link: https://patch.msgid.link/20251120-backlight-aw99706-fix-unused-pm-functions-v1-1-8b9c17c4e783@kernel.org Signed-off-by: Lee Jones

backlight: aw99706: Add support for Awinic AW99706 backlight

2025-11-25T12:54:14+00:00

Add support for Awinic AW99706 backlight, which can be found in tablet and notebook backlight, one case is the Lenovo Legion Y700 Gen4. This driver refers to the official datasheets and android driver, they can be found in [1]. [1] https://www.awinic.com/en/productDetail/AW99706QNR Signed-off-by: Junjie Cao Tested-by: Pengyu Luo Signed-off-by: Pengyu Luo Reviewed-by: Daniel Thompson (RISCstar) Link: https://patch.msgid.link/20251109032240.3422503-3-caojunjie650@gmail.com Signed-off-by: Lee Jones