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Message-ID: <20260201104343.79231-8-clamor95@gmail.com>
Date: Sun, 1 Feb 2026 12:43:41 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Lee Jones <lee@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Pavel Machek <pavel@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sebastian Reichel <sre@...nel.org>,
Svyatoslav Ryhel <clamor95@...il.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>,
Ion Agorria <ion@...rria.com>
Cc: devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-input@...r.kernel.org,
linux-leds@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: [PATCH v1 7/9] leds: Add driver for Asus Transformer LEDs
From: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Asus Transformer tablets have a green and an amber LED on both the pad
and the dock. If both LEDs are enabled simultaneously, the emitted light
will be yellow.
Co-developed-by: Svyatoslav Ryhel <clamor95@...il.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
drivers/leds/Kconfig | 11 ++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-asus-ec.c | 106 ++++++++++++++++++++++++++++++++++++
3 files changed, 118 insertions(+)
create mode 100644 drivers/leds/leds-asus-ec.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 597d7a79c988..96dab210f6ca 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -120,6 +120,17 @@ config LEDS_OSRAM_AMS_AS3668
To compile this driver as a module, choose M here: the module
will be called leds-as3668.
+config LEDS_ASUSEC
+ tristate "LED Support for Asus Transformer charging LED"
+ depends on LEDS_CLASS
+ depends on MFD_ASUSEC
+ help
+ This option enables support for charging indicator on
+ Asus Transformer's Pad and it's Dock.
+
+ To compile this driver as a module, choose M here: the module
+ will be called leds-asus-ec.
+
config LEDS_AW200XX
tristate "LED support for Awinic AW20036/AW20054/AW20072/AW20108"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 8fdb45d5b439..1117304dfdf4 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o
obj-$(CONFIG_LEDS_APU) += leds-apu.o
obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o
obj-$(CONFIG_LEDS_AS3668) += leds-as3668.o
+obj-$(CONFIG_LEDS_ASUSEC) += leds-asus-ec.o
obj-$(CONFIG_LEDS_AW200XX) += leds-aw200xx.o
obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o
obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o
diff --git a/drivers/leds/leds-asus-ec.c b/drivers/leds/leds-asus-ec.c
new file mode 100644
index 000000000000..2fae62ddb936
--- /dev/null
+++ b/drivers/leds/leds-asus-ec.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ASUS EC driver - battery LED
+ */
+
+#include <linux/err.h>
+#include <linux/leds.h>
+#include <linux/mfd/asus-ec.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/*
+ * F[5] & 0x07
+ * auto: brightness == 0
+ * bit 0: blink / charger on
+ * bit 1: amber on
+ * bit 2: green on
+ */
+
+#define ASUSEC_CTL_LED_BLINK BIT_ULL(40)
+#define ASUSEC_CTL_LED_AMBER BIT_ULL(41)
+#define ASUSEC_CTL_LED_GREEN BIT_ULL(42)
+
+static void asus_ec_led_set_brightness_amber(struct led_classdev *led,
+ enum led_brightness brightness)
+{
+ const struct asusec_info *ec = dev_get_drvdata(led->dev->parent);
+
+ if (brightness)
+ asus_ec_set_ctl_bits(ec, ASUSEC_CTL_LED_AMBER);
+ else
+ asus_ec_clear_ctl_bits(ec, ASUSEC_CTL_LED_AMBER);
+}
+
+static void asus_ec_led_set_brightness_green(struct led_classdev *led,
+ enum led_brightness brightness)
+{
+ const struct asusec_info *ec =
+ dev_get_drvdata(led->dev->parent);
+
+ if (brightness)
+ asus_ec_set_ctl_bits(ec, ASUSEC_CTL_LED_GREEN);
+ else
+ asus_ec_clear_ctl_bits(ec, ASUSEC_CTL_LED_GREEN);
+}
+
+static int asus_ec_led_probe(struct platform_device *pdev)
+{
+ struct asusec_info *ec = cell_to_ec(pdev);
+ struct led_classdev *amber_led, *green_led;
+ int ret;
+
+ platform_set_drvdata(pdev, ec);
+
+ amber_led = devm_kzalloc(&pdev->dev, sizeof(*amber_led), GFP_KERNEL);
+ if (!amber_led)
+ return -ENOMEM;
+
+ amber_led->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s::amber", ec->name);
+ amber_led->max_brightness = 1;
+ amber_led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
+ amber_led->brightness_set = asus_ec_led_set_brightness_amber;
+
+ ret = devm_led_classdev_register(&pdev->dev, amber_led);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to register amber LED\n");
+
+ green_led = devm_kzalloc(&pdev->dev, sizeof(*green_led), GFP_KERNEL);
+ if (!green_led)
+ return -ENOMEM;
+
+ green_led->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s::green", ec->name);
+ green_led->max_brightness = 1;
+ green_led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
+ green_led->brightness_set = asus_ec_led_set_brightness_green;
+
+ ret = devm_led_classdev_register(&pdev->dev, green_led);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to register green LED\n");
+
+ return 0;
+}
+
+static const struct of_device_id asus_ec_led_match[] = {
+ { .compatible = "asus,ec-led" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, asus_ec_led_match);
+
+static struct platform_driver asus_ec_led_driver = {
+ .driver = {
+ .name = "asus-ec-led",
+ .of_match_table = asus_ec_led_match,
+ },
+ .probe = asus_ec_led_probe,
+};
+module_platform_driver(asus_ec_led_driver);
+
+MODULE_AUTHOR("Michał Mirosław <mirq-linux@...e.qmqm.pl>");
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@...il.com>");
+MODULE_DESCRIPTION("ASUS Transformer's charging LED driver");
+MODULE_LICENSE("GPL");
--
2.51.0
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