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Message-Id: <20241211-aaeon-up-board-pinctrl-support-v1-2-24719be27631@bootlin.com>
Date: Wed, 11 Dec 2024 17:27:17 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>, Lee Jones <lee@...nel.org>,
Pavel Machek <pavel@....cz>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org, thomas.petazzoni@...tlin.com,
DanieleCleri@...on.eu, GaryWang@...on.com.tw,
Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH 2/5] leds: Add AAEON UP board LED driver
Add support for LEDs on AAEON UP boards. These leds are managed by the
onboard FPGA:
- UP boards: yellow, green, red
- UP Squared boards: blue, yellow, green, red
Based on the work done by Gary Wang <garywang@...on.com.tw>, largely
rewritten.
Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
drivers/leds/Kconfig | 9 ++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-upboard.c | 126 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 136 insertions(+)
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index b784bb74a837..984ef5cfa9fa 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -815,6 +815,15 @@ config LEDS_SC27XX_BLTC
This driver can also be built as a module. If so the module will be
called leds-sc27xx-bltc.
+config LEDS_UPBOARD
+ tristate "LED support for the UP board"
+ depends on LEDS_CLASS && MFD_UPBOARD_FPGA
+ help
+ This option enables support for the UP board LEDs.
+
+ This driver can also be built as a module. If so the module will be
+ called leds-upboard.
+
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
config LEDS_BLINKM
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 18afbb5a23ee..e7982938ddc1 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o
obj-$(CONFIG_LEDS_TLC591XX) += leds-tlc591xx.o
obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.o
obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o
+obj-$(CONFIG_LEDS_UPBOARD) += leds-upboard.o
obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
diff --git a/drivers/leds/leds-upboard.c b/drivers/leds/leds-upboard.c
new file mode 100644
index 000000000000..b350eb294280
--- /dev/null
+++ b/drivers/leds/leds-upboard.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * UP board LED driver.
+ *
+ * Copyright (c) AAEON. All rights reserved.
+ * Copyright (C) 2024 Bootlin
+ *
+ * Author: Gary Wang <garywang@...on.com.tw>
+ * Author: Thomas Richard <thomas.richard@...tlin.com>
+ */
+
+#include <linux/device.h>
+#include <linux/container_of.h>
+#include <linux/leds.h>
+#include <linux/mfd/upboard-fpga.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define led_cdev_to_led_upboard(c) container_of(c, struct upboard_led, cdev)
+
+struct upboard_led {
+ struct regmap_field *field;
+ struct led_classdev cdev;
+};
+
+struct upboard_led_profile {
+ const char *name;
+ unsigned int bit;
+};
+
+static struct upboard_led_profile upboard_up_led_profile[] = {
+ { "upboard:yellow:" LED_FUNCTION_STATUS, 0 },
+ { "upboard:green:" LED_FUNCTION_STATUS, 1 },
+ { "upboard:red:" LED_FUNCTION_STATUS, 2 },
+};
+
+static struct upboard_led_profile upboard_up2_led_profile[] = {
+ { "upboard:blue:" LED_FUNCTION_STATUS, 0 },
+ { "upboard:yellow:" LED_FUNCTION_STATUS, 1 },
+ { "upboard:green:" LED_FUNCTION_STATUS, 2 },
+ { "upboard:red:" LED_FUNCTION_STATUS, 3 },
+};
+
+static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev)
+{
+ struct upboard_led *led = led_cdev_to_led_upboard(cdev);
+ int brightness, ret;
+
+ ret = regmap_field_read(led->field, &brightness);
+
+ return ret ? LED_OFF : brightness;
+};
+
+static int upboard_led_brightness_set(struct led_classdev *cdev, enum led_brightness brightness)
+{
+ struct upboard_led *led = led_cdev_to_led_upboard(cdev);
+
+ return regmap_field_write(led->field, brightness != LED_OFF);
+};
+
+static int upboard_led_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct upboard_fpga *fpga = dev_get_drvdata(dev->parent);
+ struct upboard_led_profile *led_profile;
+ struct upboard_led *led;
+ int led_instances, ret, i;
+
+ switch (fpga->fpga_data->type) {
+ case UPBOARD_UP_FPGA:
+ led_profile = upboard_up_led_profile;
+ led_instances = ARRAY_SIZE(upboard_up_led_profile);
+ break;
+ case UPBOARD_UP2_FPGA:
+ led_profile = upboard_up2_led_profile;
+ led_instances = ARRAY_SIZE(upboard_up2_led_profile);
+ break;
+ default:
+ return dev_err_probe(dev, -EINVAL, "Unknown device type %d\n",
+ fpga->fpga_data->type);
+ }
+
+ for (i = 0; i < led_instances; i++) {
+ const struct reg_field fldconf = {
+ .reg = UPBOARD_REG_FUNC_EN0,
+ .lsb = led_profile[i].bit,
+ .msb = led_profile[i].bit,
+ };
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->field = devm_regmap_field_alloc(&pdev->dev, fpga->regmap, fldconf);
+ if (IS_ERR(led->field))
+ return PTR_ERR(led->field);
+
+ led->cdev.brightness_get = upboard_led_brightness_get;
+ led->cdev.brightness_set_blocking = upboard_led_brightness_set;
+ led->cdev.max_brightness = LED_ON;
+
+ led->cdev.name = led_profile[i].name;
+
+ ret = devm_led_classdev_register(dev, &led->cdev);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct platform_driver upboard_led_driver = {
+ .driver = {
+ .name = "upboard-leds",
+ },
+ .probe = upboard_led_probe,
+};
+
+module_platform_driver(upboard_led_driver);
+
+MODULE_AUTHOR("Gary Wang <garywang@...on.com.tw>");
+MODULE_AUTHOR("Thomas Richard <thomas.richard@...tlin.com>");
+MODULE_DESCRIPTION("UP Board LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:upboard-led");
--
2.39.5
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