[RFC,3/3] leds: Add support for UP board CPLD onboard LEDS
Commit Message
The UP boards come with a few FPGA-controlled onboard LEDs:
* UP Board: yellow, green, red
* UP Squared: blue, yellow, green, red
This patch depends on patch "mfd: Add support for UP board CPLD/FPGA".
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: larry.lai <larry.lai@yunjingtech.com>
---
PATCH V3 -> RFC 2022/11/23: Update the changes Copyright.
PATCH V1 -> V3: There is no change.
PATCH --> PATCH V1: Refer 2022/10/03 Andy Shevchenko review, cleaned up
coding style.
---
drivers/leds/Kconfig | 10 +++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-upboard.c | 79 +++++++++++++++++++++++++++++++++++++
3 files changed, 90 insertions(+)
create mode 100644 drivers/leds/leds-upboard.c
@@ -872,6 +872,16 @@ source "drivers/leds/flash/Kconfig"
comment "RGB LED drivers"
source "drivers/leds/rgb/Kconfig"
+config LEDS_UPBOARD
+ tristate "LED support for the UP board"
+ depends on LEDS_CLASS
+ depends on MFD_INTEL_UPBOARD_FPGA
+ help
+ This option enables support for the UP board LEDs.
+
+ To compile this driver as a module, choose M here: the module
+ will be called leds-upboard.
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"
@@ -83,6 +83,7 @@ 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
new file mode 100644
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * UP Board FPGA-based LED driver
+ *
+ * Copyright (c) 2017, Emutex Ltd. All rights reserved.
+ * Copyright (c) 2022, YunJingTech Ltd.
+ *
+ * Author: Javier Arteaga <javier@emutex.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/mfd/upboard-fpga.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+struct upboard_led {
+ struct led_classdev cdev;
+ struct regmap_field *field;
+};
+
+static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev)
+{
+ struct upboard_led *led = container_of(cdev, struct upboard_led, cdev);
+ int brightness = 0;
+
+ regmap_field_read(led->field, &brightness);
+
+ return brightness;
+};
+
+static void upboard_led_brightness_set(struct led_classdev *cdev, enum led_brightness brightness)
+{
+ struct upboard_led *led = container_of(cdev, struct upboard_led, cdev);
+
+ regmap_field_write(led->field, brightness != LED_OFF);
+};
+
+static int __init upboard_led_probe(struct platform_device *pdev)
+{
+ struct upboard_fpga * const up_fpga = dev_get_drvdata(pdev->dev.parent);
+ struct reg_field fldconf = {
+ .reg = UPFPGA_REG_FUNC_EN0,
+ };
+ struct upboard_led_data * const pdata = pdev->dev.platform_data;
+ struct upboard_led *led;
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ fldconf.lsb = pdata->bit;
+ fldconf.msb = pdata->bit;
+ led->field = devm_regmap_field_alloc(&pdev->dev, up_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 = upboard_led_brightness_set;
+ led->cdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "upboard:%s:",
+ pdata->colour);
+ if (!led->cdev.name)
+ return -ENOMEM;
+
+ return devm_led_classdev_register(&pdev->dev, &led->cdev);
+};
+
+static struct platform_driver upboard_led_driver = {
+ .driver = {
+ .name = "upboard-led",
+ },
+};
+module_platform_driver_probe(upboard_led_driver, upboard_led_probe);
+
+MODULE_AUTHOR("Javier Arteaga <javier@emutex.com>");
+MODULE_DESCRIPTION("UP Board LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:upboard-led");