[PATCH 5/6][SRU][H] UBUNTU: ODM: leds: add driver for AAEON devices
AceLan Kao
acelan.kao at canonical.com
Tue May 25 10:17:13 UTC 2021
From: Kunyang_Fan <kunyang_fan at asus.com>
BugLink: https://bugs.launchpad.net/bugs/1929504
This patch adds support for the led devices which can
be controlled from sysfs through ASUS WMI interface.
Signed-off-by: Kunyang_Fan <kunyang_fan at asus.com>
Review-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Review-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
---
drivers/leds/Kconfig | 12 ++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-aaeon.c | 142 ++++++++++++++++++++++++++++++++++++++
3 files changed, 155 insertions(+)
create mode 100644 drivers/leds/leds-aaeon.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index cb3556c3b469..ce38a3d11223 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -59,6 +59,18 @@ config LEDS_88PM860X
This option enables support for on-chip LED drivers found on Marvell
Semiconductor 88PM8606 PMIC.
+config LEDS_AAEON
+ tristate "AAEON LED driver"
+ depends on X86
+ depends on UBUNTU_ODM_DRIVERS
+ select MFD_AAEON
+ help
+ This led driver adds support for LED brightness control on Single
+ Board Computers produced by AAEON.
+
+ This driver leverages the ASUS WMI interface to access device
+ resources.
+
config LEDS_AAT1290
tristate "LED support for the AAT1290"
depends on LEDS_CLASS_FLASH
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 156c0b4e60d9..0af9e4210a2c 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o
# LED Platform Drivers (keep this sorted, M-| sort)
obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
+obj-$(CONFIG_LEDS_AAEON) += leds-aaeon.o
obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
obj-$(CONFIG_LEDS_ACER_A500) += leds-acer-a500.o
obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
diff --git a/drivers/leds/leds-aaeon.c b/drivers/leds/leds-aaeon.c
new file mode 100644
index 000000000000..10090a4bff65
--- /dev/null
+++ b/drivers/leds/leds-aaeon.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AAEON LED driver
+ *
+ * Copyright (c) 2021, AAEON Ltd.
+ *
+ * Author: Kunyang Fan <kunyang_fan at aaeon.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/x86/asus-wmi.h>
+#include <linux/platform_device.h>
+
+#define DRVNAME "led_aaeon"
+#define ASUS_NB_WMI_EVENT_GUID "0B3CBB35-E3C2-45ED-91C2-4C5A6D195D1C"
+#define AAEON_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
+
+#define GET_LED_NUMBER_ID 0x00060000
+#define GET_LED_METHOD_ID 0x00060001
+#define SET_LED_METHOD_ID 0x00060002
+#define GET_LED_NUMBER_METHOD_ID 0x10
+
+
+struct aaeon_led_data {
+ int id;
+ struct led_classdev cdev;
+};
+
+static int aaeon_led_get_number(void)
+{
+ int err, retval;
+
+ err = asus_wmi_evaluate_method(GET_LED_NUMBER_ID,
+ GET_LED_NUMBER_METHOD_ID,
+ 0, &retval);
+ if (err)
+ return err;
+
+ return retval;
+}
+
+static enum led_brightness aaeon_led_brightness_get(struct led_classdev
+ *cdev)
+{
+ int err, brightness;
+ struct aaeon_led_data *led =
+ container_of(cdev, struct aaeon_led_data, cdev);
+ u32 arg0;
+
+ arg0 = (u32)(led->id & 0xF);
+ err = asus_wmi_evaluate_method(GET_LED_METHOD_ID, arg0, 0, &brightness);
+ if (err)
+ return err;
+
+ return brightness;
+};
+
+static void aaeon_led_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ int err, retval;
+ struct aaeon_led_data *led =
+ container_of(cdev, struct aaeon_led_data, cdev);
+ u32 arg0;
+
+ arg0 = (u32)(led->id & 0xF);
+ if (brightness != LED_OFF)
+ arg0 |= BIT(16);
+
+ err = asus_wmi_evaluate_method(SET_LED_METHOD_ID, arg0, 0, &retval);
+};
+
+static int __init aaeon_add_led_device(struct platform_device *pdev,
+ int id)
+{
+ struct aaeon_led_data *led;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(struct aaeon_led_data), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->id = id;
+ led->cdev.brightness_get = aaeon_led_brightness_get;
+ led->cdev.brightness_set = aaeon_led_brightness_set;
+ led->cdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "led:%d:", id);
+
+ if (!led->cdev.name)
+ return -ENOMEM;
+
+ return devm_led_classdev_register(&pdev->dev, &led->cdev);
+}
+
+static int aaeon_led_probe(struct platform_device *pdev)
+{
+ int err = -ENODEV, i;
+ int led_number = 0;
+
+ pr_debug("aaeon led device probe!\n");
+ /* Prevent other drivers adding this platfom device */
+ if (!wmi_has_guid(AAEON_WMI_MGMT_GUID)) {
+ pr_debug("AAEON Management GUID not found\n");
+ return -ENODEV;
+ }
+
+ /* Query the number of led devices board support */
+ led_number = aaeon_led_get_number();
+
+ /*
+ * If the number is 0 or can't get the number of leds,
+ * no need to register any led device node.
+ */
+ if (led_number <= 0)
+ return -ENODEV;
+
+ for (i = 0; i < led_number; i++) {
+ err = aaeon_add_led_device(pdev, i);
+ if (err)
+ break;
+ }
+
+ return err;
+}
+
+static struct platform_driver aaeon_led_driver = {
+ .driver = {
+ .name = "leds-aaeon",
+ },
+};
+
+module_platform_driver_probe(aaeon_led_driver, aaeon_led_probe);
+
+MODULE_ALIAS("platform:leds-aaeon");
+MODULE_DESCRIPTION("AAEON LED Driver");
+MODULE_AUTHOR("Kunyang Fan <kunyang_fan at asus.com>");
+MODULE_LICENSE("GPL v2");
--
2.25.1
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