[PATCH 7/9] leds: add Photonicat PMU LED driver

[Junhao Xie]

Photonicat has a network status LED that can be controlled by system.
The LED status can be set through command 0x19.

Signed-off-by: Junhao Xie <bigfoot at classfun.cn>
---
 drivers/leds/Kconfig           | 11 +++++
 drivers/leds/Makefile          |  1 +
 drivers/leds/leds-photonicat.c | 75 ++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 drivers/leds/leds-photonicat.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 8d9d8da376e4..539adb5944e6 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -381,6 +381,17 @@ config LEDS_PCA9532_GPIO
 	  To use a pin as gpio pca9532_type in pca9532_platform data needs to
 	  set to PCA9532_TYPE_GPIO.
 
+config LEDS_PHOTONICAT_PMU
+	tristate "LED Support for Photonicat PMU"
+	depends on LEDS_CLASS
+	depends on MFD_PHOTONICAT_PMU
+	help
+	  Photonicat has a network status LED that can be controlled by system,
+	  this option enables support for LEDs connected to the Photonicat PMU.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called leds-photonicat.
+
 config LEDS_GPIO
 	tristate "LED Support for GPIO connected LEDs"
 	depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 18afbb5a23ee..dcd5312aee12 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
 obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
 obj-$(CONFIG_LEDS_PCA963X)		+= leds-pca963x.o
 obj-$(CONFIG_LEDS_PCA995X)		+= leds-pca995x.o
+obj-$(CONFIG_LEDS_PHOTONICAT_PMU)	+= leds-photonicat.o
 obj-$(CONFIG_LEDS_PM8058)		+= leds-pm8058.o
 obj-$(CONFIG_LEDS_POWERNV)		+= leds-powernv.o
 obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
diff --git a/drivers/leds/leds-photonicat.c b/drivers/leds/leds-photonicat.c
new file mode 100644
index 000000000000..3aa5ce525b83
--- /dev/null
+++ b/drivers/leds/leds-photonicat.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 Junhao Xie <bigfoot at classfun.cn>
+ */
+
+#include <linux/mfd/photonicat-pmu.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+
+struct pcat_leds {
+	struct device *dev;
+	struct pcat_pmu *pmu;
+	struct led_classdev cdev;
+};
+
+static int pcat_led_status_set(struct led_classdev *cdev,
+			       enum led_brightness brightness)
+{
+	struct pcat_leds *leds = container_of(cdev, struct pcat_leds, cdev);
+	struct pcat_data_cmd_led_setup setup = { 0, 0, 0 };
+
+	if (brightness)
+		setup.on_time = 100;
+	else
+		setup.down_time = 100;
+	return pcat_pmu_write_data(leds->pmu, PCAT_CMD_NET_STATUS_LED_SETUP,
+				   &setup, sizeof(setup));
+}
+
+static int pcat_leds_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct device *dev = &pdev->dev;
+	struct pcat_leds *leds;
+	const char *label;
+
+	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	leds->dev = dev;
+	leds->pmu = dev_get_drvdata(dev->parent);
+	platform_set_drvdata(pdev, leds);
+
+	ret = of_property_read_string(dev->of_node, "label", &label);
+	if (ret)
+		return dev_err_probe(dev, ret, "No label property\n");
+
+	leds->cdev.name = label;
+	leds->cdev.max_brightness = 1;
+	leds->cdev.brightness_set_blocking = pcat_led_status_set;
+
+	return devm_led_classdev_register(dev, &leds->cdev);
+}
+
+static const struct of_device_id pcat_leds_dt_ids[] = {
+	{ .compatible = "ariaboard,photonicat-pmu-leds", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pcat_leds_dt_ids);
+
+static struct platform_driver pcat_leds_driver = {
+	.driver = {
+		.name = "photonicat-leds",
+		.of_match_table = pcat_leds_dt_ids,
+	},
+	.probe = pcat_leds_probe,
+};
+module_platform_driver(pcat_leds_driver);
+
+MODULE_AUTHOR("Junhao Xie <bigfoot at classfun.cn>");
+MODULE_DESCRIPTION("Photonicat PMU Status LEDs");
+MODULE_LICENSE("GPL");
-- 
2.46.0