mirror of
https://github.com/t2linux/linux-t2-patches.git
synced 2026-08-16 05:18:17 -07:00
153 lines
4.7 KiB
Diff
153 lines
4.7 KiB
Diff
From 7003534e80174279b258e5d4dca5353f184814d2 Mon Sep 17 00:00:00 2001
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From: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
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Date: Fri, 24 Apr 2026 18:57:31 +0530
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Subject: [PATCH 05/12] kbl
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Signed-off-by: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
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---
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MAINTAINERS | 1 +
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drivers/leds/Kconfig | 11 ++++++
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drivers/leds/Makefile | 1 +
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drivers/leds/leds-macsmc.c | 70 ++++++++++++++++++++++++++++++++++++++
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drivers/mfd/macsmc-core.c | 1 +
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5 files changed, 84 insertions(+)
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create mode 100644 drivers/leds/leds-macsmc.c
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diff --git a/MAINTAINERS b/MAINTAINERS
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index db697f91fbfa..6a7a9b082f83 100644
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--- a/MAINTAINERS
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+++ b/MAINTAINERS
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@@ -1956,6 +1956,7 @@ M: Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
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S: Odd fixes
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F: drivers/iio/accel/macsmc-accel.c
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F: drivers/iio/light/macsmc-light.c
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+F: drivers/leds/leds-macsmc.c
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F: drivers/platform/x86/macsmc-acpi.c
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APPLETALK NETWORK LAYER
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diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
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index f4a0a3c8c870..f67280fd001d 100644
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -728,6 +728,17 @@ config LEDS_ADP5520
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To compile this driver as a module, choose M here: the module will
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be called leds-adp5520.
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+config LEDS_MACSMC
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+ tristate "Keyboard Backlight support for Intel-Macs"
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+ depends on LEDS_CLASS
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+ depends on MACSMC_ACPI
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+ help
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+ This option enables support for the Keyboard backlight in
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+ Intel-Macs using macsmc.
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+
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+ To compile this driver as a module, choose M here: the module will
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+ be called leds-macsmc.
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+
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config LEDS_MAX5970
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tristate "LED Support for Maxim 5970"
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depends on LEDS_CLASS
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diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
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index 8fdb45d5b439..81d0705e10de 100644
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -61,6 +61,7 @@ obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
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obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
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obj-$(CONFIG_LEDS_LP8864) += leds-lp8864.o
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obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
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+obj-$(CONFIG_LEDS_MACSMC) += leds-macsmc.o
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obj-$(CONFIG_LEDS_MAX5970) += leds-max5970.o
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obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
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obj-$(CONFIG_LEDS_MAX77705) += leds-max77705.o
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diff --git a/drivers/leds/leds-macsmc.c b/drivers/leds/leds-macsmc.c
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new file mode 100644
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index 000000000000..5656ce034d5b
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--- /dev/null
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+++ b/drivers/leds/leds-macsmc.c
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@@ -0,0 +1,70 @@
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+// SPDX-License-Identifier: GPL-2.0 OR MIT
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+/*
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+ * Apple SMC Keyboard backlight driver
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+ *
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+ * Copyright (C) 2026 Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>
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+ */
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+
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+#include <linux/leds.h>
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+#include <linux/mfd/macsmc.h>
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+#include <linux/platform_device.h>
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+
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+#define BACKLIGHT_KEY SMC_KEY(LKSB)
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+
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+struct macsmc_led {
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+ struct led_classdev cdev;
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+ struct apple_smc *smc;
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+ u8 brightness;
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+};
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+
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+static enum led_brightness macsmc_led_get_brightness(struct led_classdev *cdev)
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+{
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+ struct macsmc_led *smc_led = container_of(cdev, struct macsmc_led, cdev);
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+
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+ return smc_led->brightness;
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+}
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+
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+static void macsmc_led_set_brightness(struct led_classdev *cdev, enum led_brightness value)
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+{
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+ struct macsmc_led *smc_led = container_of(cdev, struct macsmc_led, cdev);
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+
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+ smc_led->brightness = (u8) value;
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+
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+ apple_smc_write_u16(smc_led->smc, BACKLIGHT_KEY, smc_led->brightness);
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+}
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+
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+static int macsmc_led_probe(struct platform_device *pdev)
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+{
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+ struct apple_smc *smc = dev_get_drvdata(pdev->dev.parent);
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+ struct macsmc_led *smc_led;
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+
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+ if (!apple_smc_key_exists(smc, BACKLIGHT_KEY))
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+ return -ENODEV;
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+
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+ smc_led = devm_kzalloc(&pdev->dev, sizeof(*smc_led), GFP_KERNEL);
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+ if (!smc_led)
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+ return -ENOMEM;
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+
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+ smc_led->smc = smc;
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+
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+ smc_led->cdev.name = "macsmc-led";
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+ smc_led->cdev.max_brightness = 255;
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+ smc_led->cdev.brightness_get = macsmc_led_get_brightness;
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+ smc_led->cdev.brightness_set = macsmc_led_set_brightness;
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+ smc_led->cdev.dev = &pdev->dev;
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+
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+ return devm_led_classdev_register(&pdev->dev, &smc_led->cdev);
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+}
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+
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+static struct platform_driver macsmc_led_driver = {
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+ .probe = macsmc_led_probe,
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+ .driver = {
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+ .name = "macsmc-led",
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+ },
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+};
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+module_platform_driver(macsmc_led_driver);
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+
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+MODULE_AUTHOR("Atharva Tiwari <atharvatiwarilinuxdev@gmail.com>");
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+MODULE_DESCRIPTION("LED keyboard backlight driver for Intel-macs using macsmc");
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+MODULE_LICENSE("Dual MIT/GPL");
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+MODULE_ALIAS("platform:macsmc-led");
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diff --git a/drivers/mfd/macsmc-core.c b/drivers/mfd/macsmc-core.c
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index bcfa77dd8146..ad5f5f7c050a 100644
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--- a/drivers/mfd/macsmc-core.c
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+++ b/drivers/mfd/macsmc-core.c
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@@ -23,6 +23,7 @@ static const struct mfd_cell apple_smc_devs[] = {
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static const struct mfd_cell apple_smc_acpi_devs[] = {
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MFD_CELL_NAME("macsmc-accel"),
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MFD_CELL_NAME("macsmc-hwmon"),
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+ MFD_CELL_NAME("macsmc-led"),
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MFD_CELL_NAME("macsmc-light"),
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MFD_CELL_NAME("macsmc-power"),
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MFD_CELL_NAME("macsmc-rtc"),
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--
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2.43.0
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