Commit 0ef2929a authored by Thomas Richard's avatar Thomas Richard Committed by Lee Jones
Browse files

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@aaeon.com.tw>, largely
rewritten.

Signed-off-by: default avatarThomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20241211-aaeon-up-board-pinctrl-support-v1-2-24719be27631@bootlin.com


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent 0dfda509

drivers/leds/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -817,6 +817,15 @@ 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

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/leds-upboard.c

0 → 100644
+126 −0
Original line number Diff line number Diff line 
// 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@aaeon.com.tw>

 * Author: Thomas Richard <thomas.richard@bootlin.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@aaeon.com.tw>");

MODULE_AUTHOR("Thomas Richard <thomas.richard@bootlin.com>");

MODULE_DESCRIPTION("UP Board LED driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:upboard-led");