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Mon, 19 Oct 2026 03:04:30 -0700 (PDT) From: Svyatoslav Ryhel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Torokhov , Lee Jones , Pavel Machek , Sebastian Reichel , Svyatoslav Ryhel , Ion Agorria , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Florian Krischer Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, mfd@lists.linux.dev, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v12 5/7] leds: Add driver for ASUS Transformer LEDs Date: Mon, 19 Oct 2026 13:04:04 +0300 Message-ID: <20261019100406.103687-6-clamor95@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261019100406.103687-1-clamor95@gmail.com> References: <20261019100406.103687-1-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-transformer-ec.c | 125 ++++++++++++++++++++++++ 3 files changed, 137 insertions(+) create mode 100644 drivers/leds/leds-asus-transformer-ec.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 7ec2c8d785426..788e689fe875c 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_ASUS_TRANSFORMER_EC + tristate "LED Support for Asus Transformer charging LED" + depends on LEDS_CLASS + depends on MFD_ASUS_TRANSFORMER_EC + help + This option enables support for charging indicator on + Asus Transformer's Pad and its Dock. + + To compile this driver as a module, choose M here: the module + will be called leds-asus-transformer-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 4d4b089156e24..3da746279bb81 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_APU) += leds-apu.o obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o +obj-$(CONFIG_LEDS_ASUS_TRANSFORMER_EC) += leds-asus-transformer-ec.o obj-$(CONFIG_LEDS_OSRAM_AMS_AS3668) += leds-as3668.o obj-$(CONFIG_LEDS_AW200XX) += leds-aw200xx.o obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o diff --git a/drivers/leds/leds-asus-transformer-ec.c b/drivers/leds/leds-asus-transformer-ec.c new file mode 100644 index 0000000000000..1b129247ea6c6 --- /dev/null +++ b/drivers/leds/leds-asus-transformer-ec.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include +#include + +enum { + ASUSEC_LED_AMBER, + ASUSEC_LED_GREEN, + ASUSEC_LED_MAX +}; + +struct asus_ec_led_config { + const char *name; + unsigned int color; + u64 ctrl_bit; +}; + +struct asus_ec_led { + struct asus_ec_leds_data *ddata; + struct led_classdev cdev; + u64 ctrl_bit; +}; + +struct asus_ec_leds_data { + const struct asusec_core *ec; + struct asus_ec_led leds[ASUSEC_LED_MAX]; +}; + +static const struct asus_ec_led_config asus_ec_leds[] = { + [ASUSEC_LED_AMBER] = { + .name = "amber", + .color = LED_COLOR_ID_AMBER, + .ctrl_bit = ASUSEC_CTL_LED_AMBER, + }, + [ASUSEC_LED_GREEN] = { + .name = "green", + .color = LED_COLOR_ID_GREEN, + .ctrl_bit = ASUSEC_CTL_LED_GREEN, + }, +}; + +static enum led_brightness asus_ec_led_get_brightness(struct led_classdev *cdev) +{ + struct asus_ec_led *led = container_of(cdev, struct asus_ec_led, cdev); + const struct asusec_core *ec = led->ddata->ec; + u64 ctl; + int ret; + + ret = asus_dockram_access_ctl(ec->dockram, &ctl, 0, 0); + if (ret) + return LED_OFF; + + return ctl & led->ctrl_bit ? LED_ON : LED_OFF; +} + +static int asus_ec_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct asus_ec_led *led = container_of(cdev, struct asus_ec_led, cdev); + const struct asusec_core *ec = led->ddata->ec; + + if (brightness) + return asus_dockram_access_ctl(ec->dockram, NULL, + led->ctrl_bit, led->ctrl_bit); + + return asus_dockram_access_ctl(ec->dockram, NULL, led->ctrl_bit, 0); +} + +static int asus_ec_led_probe(struct platform_device *pdev) +{ + const struct asusec_core *ec = dev_get_drvdata(pdev->dev.parent); + struct asus_ec_leds_data *ddata; + struct device *dev = &pdev->dev; + int ret; + + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + platform_set_drvdata(pdev, ddata); + ddata->ec = ec; + + for (int i = 0; i < ASUSEC_LED_MAX; i++) { + const struct asus_ec_led_config *cfg = &asus_ec_leds[i]; + struct asus_ec_led *led = &ddata->leds[i]; + + led->cdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", + ddata->ec->name, cfg->name); + if (!led->cdev.name) + return -ENOMEM; + + led->cdev.max_brightness = 1; + led->cdev.color = cfg->color; + led->cdev.flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN; + led->cdev.brightness_get = asus_ec_led_get_brightness; + led->cdev.brightness_set_blocking = asus_ec_led_set_brightness; + + led->ddata = ddata; + led->ctrl_bit = cfg->ctrl_bit; + + ret = devm_led_classdev_register(dev, &led->cdev); + if (ret) + return dev_err_probe(dev, ret, + "Failed to register %s LED\n", + cfg->name); + } + + return 0; +} + +static struct platform_driver asus_ec_led_driver = { + .driver.name = "asus-transformer-ec-led", + .probe = asus_ec_led_probe, +}; +module_platform_driver(asus_ec_led_driver); + +MODULE_ALIAS("platform:asus-transformer-ec-led"); +MODULE_AUTHOR("Michał Mirosław "); +MODULE_AUTHOR("Svyatoslav Ryhel "); +MODULE_DESCRIPTION("ASUS Transformer's charging LED driver"); +MODULE_LICENSE("GPL"); -- 2.53.0