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Mon, 09 Feb 2026 02:44:34 -0800 (PST) From: Svyatoslav Ryhel To: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Torokhov , Pavel Machek , Arnd Bergmann , Greg Kroah-Hartman , Sebastian Reichel , Svyatoslav Ryhel , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Ion Agorria Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 7/9] leds: Add driver for Asus Transformer LEDs Date: Mon, 9 Feb 2026 12:44:05 +0200 Message-ID: <20260209104407.116426-8-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260209104407.116426-1-clamor95@gmail.com> References: <20260209104407.116426-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michał Mirosław 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 Signed-off-by: Svyatoslav Ryhel Signed-off-by: Michał Mirosław --- drivers/leds/Kconfig | 11 ++++ drivers/leds/Makefile | 1 + drivers/leds/leds-asus-ec.c | 104 ++++++++++++++++++++++++++++++++++++ 3 files changed, 116 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..5dd76c9247ee --- /dev/null +++ b/drivers/leds/leds-asus-ec.c @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ASUS EC driver - battery LED + */ + +#include +#include +#include +#include +#include +#include +#include + +/* + * 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 device *dev = &pdev->dev; + struct led_classdev *amber_led, *green_led; + int ret; + + platform_set_drvdata(pdev, ec); + + amber_led = devm_kzalloc(dev, sizeof(*amber_led), GFP_KERNEL); + if (!amber_led) + return -ENOMEM; + + amber_led->name = devm_kasprintf(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(dev, amber_led); + if (ret) + return dev_err_probe(dev, ret, "failed to register amber LED\n"); + + green_led = devm_kzalloc(dev, sizeof(*green_led), GFP_KERNEL); + if (!green_led) + return -ENOMEM; + + green_led->name = devm_kasprintf(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(dev, green_led); + if (ret) + return dev_err_probe(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 "); +MODULE_AUTHOR("Svyatoslav Ryhel "); +MODULE_DESCRIPTION("ASUS Transformer's charging LED driver"); +MODULE_LICENSE("GPL"); -- 2.51.0