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Thu, 29 Oct 2026 01:58:47 -0700 (PDT) Received: from at-Standard-PC-Q35-ICH9-2009 ([27.60.20.232]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a23641e78sm16497937eec.0.2026.10.29.01.58.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 01:58:46 -0700 (PDT) From: Atharva Tiwari To: Cc: Atharva Tiwari , Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Rafael J. Wysocki" , Len Brown , Linus Walleij , Bartosz Golaszewski , Sven Peter , Janne Grunau , Neal Gompa , Guenter Roeck , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Lee Jones , Pavel Machek , Griffin Kroah-Hartman , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sebastian Reichel , Alexandre Belloni , Wim Van Sebroeck , Jarkko Sakkinen , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Paul Moore , James Morris , "Serge E. Hallyn" , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-leds@vger.kernel.org, mfd@lists.linux.dev, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [RFC PATCH 06/14] leds: add support for macsmc kbl Date: Thu, 29 Oct 2026 04:52:03 -0400 Message-ID: <20261029085504.3547-7-atharvatiwarilinuxdev@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> References: <20261029085504.3547-1-atharvatiwarilinuxdev@gmail.com> X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a LED class driver to control the keyboard backlight. This replaces the keyboard backlight support in applesmc. Signed-off-by: Atharva Tiwari --- drivers/leds/Kconfig | 11 ++++++ drivers/leds/Makefile | 1 + drivers/leds/leds-macsmc.c | 69 ++++++++++++++++++++++++++++++++++++++ drivers/mfd/macsmc-core.c | 11 ++++++ 4 files changed, 92 insertions(+) create mode 100644 drivers/leds/leds-macsmc.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 7ec2c8d78..30cd64d41 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -729,6 +729,17 @@ config LEDS_ADP5520 To compile this driver as a module, choose M here: the module will be called leds-adp5520. +config LEDS_MACSMC + tristate "Keyboard Backlight support for Intel-Macs" + depends on LEDS_CLASS + depends on MACSMC_ACPI + help + This option enables support for the Keyboard backlight in + Intel-Macs using macsmc. + + To compile this driver as a module, choose M here: the module will + be called leds-macsmc. + config LEDS_MAX5970 tristate "LED Support for Maxim 5970" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4d4b08915..7c38dbef4 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_LEDS_KUNIT_TEST) += led-test.o obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o obj-$(CONFIG_LEDS_ACER_A500) += leds-acer-a500.o obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o +obj-$(CONFIG_LEDS_MACSMC) += leds-macsmc.o obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_APU) += leds-apu.o obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o diff --git a/drivers/leds/leds-macsmc.c b/drivers/leds/leds-macsmc.c new file mode 100644 index 000000000..f38ef2113 --- /dev/null +++ b/drivers/leds/leds-macsmc.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Apple SMC Keyboard backlight driver + * + * Copyright (C) 2026 Atharva Tiwari + * + * Based on drivers/hwmon/applesmc.c + * Copyright (C) 2007 Nicolas Boichat + * Copyright (C) 2010 Henrik Rydberg + * + */ + +#include +#include +#include + +struct macsmc_led { + struct led_classdev cdev; + struct apple_smc *smc; + u8 brightness; +}; + +static enum led_brightness macsmc_led_get_brightness(struct led_classdev *cdev) +{ + struct macsmc_led *drv = container_of(cdev, struct macsmc_led, cdev); + + return drv->brightness; +} + +static void macsmc_led_set_brightness(struct led_classdev *cdev, enum led_brightness value) +{ + struct macsmc_led *drv = container_of(cdev, struct macsmc_led, cdev); + + drv->brightness = (u8) value; + + apple_smc_write_u16(drv->smc, SMC_KEY(LKSB), drv->brightness); +} + +static int macsmc_led_probe(struct platform_device *pdev) +{ + struct macsmc_led *drv; + + drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL); + if (!drv) + return -ENOMEM; + + drv->smc = dev_get_drvdata(pdev->dev.parent); + + drv->cdev.name = "macsmc-led"; + drv->cdev.max_brightness = 255; + drv->cdev.brightness_get = macsmc_led_get_brightness; + drv->cdev.brightness_set = macsmc_led_set_brightness; + drv->cdev.dev = &pdev->dev; + + return devm_led_classdev_register(&pdev->dev, &drv->cdev); +} + +static struct platform_driver macsmc_led_driver = { + .probe = macsmc_led_probe, + .driver = { + .name = "macsmc-led", + }, +}; +module_platform_driver(macsmc_led_driver); + +MODULE_AUTHOR("Atharva Tiwari "); +MODULE_DESCRIPTION("LED keyboard backlight driver for Intel-macs using macsmc"); +MODULE_LICENSE("Dual MIT/GPL"); +MODULE_ALIAS("platform:macsmc-led"); diff --git a/drivers/mfd/macsmc-core.c b/drivers/mfd/macsmc-core.c index 6567d2f1f..bc4200f57 100644 --- a/drivers/mfd/macsmc-core.c +++ b/drivers/mfd/macsmc-core.c @@ -33,6 +33,10 @@ static const struct mfd_cell apple_smc_acpi_common[] = { MFD_CELL_NAME("macsmc-power"), }; +static const struct mfd_cell apple_smc_acpi_led[] = { + MFD_CELL_NAME("macsmc-led"), +}; + static const struct mfd_cell apple_smc_acpi_light[] = { MFD_CELL_NAME("macsmc-light"), }; @@ -179,6 +183,13 @@ int apple_smc_probe(struct device *dev, const struct apple_smc_backend_ops *ops, if (ret < 0) return ret; } + + if (apple_smc_key_exists(smc, SMC_KEY(LKSB))) { + ret = devm_mfd_add_devices(dev, -1, apple_smc_acpi_led, + ARRAY_SIZE(apple_smc_acpi_led), NULL, 0, NULL); + if (ret < 0) + return ret; + } } else ret = devm_mfd_add_devices(dev, -1, apple_smc_rtkit_devs, ARRAY_SIZE(apple_smc_rtkit_devs), NULL, 0, NULL); -- 2.55.0