leds: simatic-ipc-leds-gpio: Add Elkhart Lake version

This is used for the Siemens Simatic IPC BX-21A, which has its LEDs
connected to GPIOs provided by the Intel Elkhart Lake pinctrl driver.
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Link: https://lore.kernel.org/r/20230713115639.16419-3-henning.schild@siemens.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/simple/Kconfig

@@ -35,3 +35,16 @@ config LEDS_SIEMENS_SIMATIC_IPC_F7188X
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called simatic-ipc-leds-gpio-f7188x.
+
+config LEDS_SIEMENS_SIMATIC_IPC_ELKHARTLAKE
+	tristate "LED driver for Siemens Simatic IPCs based on Intel Elkhart Lake GPIO"
+	depends on LEDS_GPIO
+	depends on PINCTRL_ELKHARTLAKE
+	depends on SIEMENS_SIMATIC_IPC
+	default LEDS_SIEMENS_SIMATIC_IPC
+	help
+	  This option enables support for the LEDs of several Industrial PCs
+	  from Siemens based on Elkhart Lake GPIO i.e. BX-21A.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called simatic-ipc-leds-gpio-elkhartlake.

drivers/leds/simple/Makefile

@@ -2,3 +2,4 @@
 obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC)			+= simatic-ipc-leds.o
 obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC_APOLLOLAKE)	+= simatic-ipc-leds-gpio-core.o simatic-ipc-leds-gpio-apollolake.o
 obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC_F7188X)		+= simatic-ipc-leds-gpio-core.o simatic-ipc-leds-gpio-f7188x.o
+obj-$(CONFIG_LEDS_SIEMENS_SIMATIC_IPC_ELKHARTLAKE)	+= simatic-ipc-leds-gpio-core.o simatic-ipc-leds-gpio-elkhartlake.o

drivers/leds/simple/simatic-ipc-leds-gpio-core.c

@@ -57,6 +57,7 @@ int simatic_ipc_leds_gpio_probe(struct platform_device *pdev,
 	switch (plat->devmode) {
 	case SIMATIC_IPC_DEVICE_127E:
 	case SIMATIC_IPC_DEVICE_227G:
+	case SIMATIC_IPC_DEVICE_BX_21A:
 		break;
 	default:
 		return -ENODEV;
@@ -72,6 +73,9 @@ int simatic_ipc_leds_gpio_probe(struct platform_device *pdev,
 		goto out;
 	}
 
+	if (!table_extra)
+		return 0;
+
 	table_extra->dev_id = dev_name(dev);
 	gpiod_add_lookup_table(table_extra);
 

drivers/leds/simple/simatic-ipc-leds-gpio-elkhartlake.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Siemens SIMATIC IPC driver for GPIO based LEDs
+ *
+ * Copyright (c) Siemens AG, 2023
+ *
+ * Author:
+ *  Henning Schild <henning.schild@siemens.com>
+ */
+
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/x86/simatic-ipc-base.h>
+
+#include "simatic-ipc-leds-gpio.h"
+
+static struct gpiod_lookup_table simatic_ipc_led_gpio_table = {
+	.dev_id = "leds-gpio",
+	.table = {
+		GPIO_LOOKUP_IDX("INTC1020:04", 72, NULL, 0, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("INTC1020:04", 77, NULL, 1, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("INTC1020:04", 78, NULL, 2, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("INTC1020:04", 58, NULL, 3, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("INTC1020:04", 60, NULL, 4, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("INTC1020:04", 62, NULL, 5, GPIO_ACTIVE_HIGH),
+		{} /* Terminating entry */
+	},
+};
+
+static int simatic_ipc_leds_gpio_elkhartlake_probe(struct platform_device *pdev)
+{
+	return simatic_ipc_leds_gpio_probe(pdev, &simatic_ipc_led_gpio_table,
+					   NULL);
+}
+
+static int simatic_ipc_leds_gpio_elkhartlake_remove(struct platform_device *pdev)
+{
+	return simatic_ipc_leds_gpio_remove(pdev, &simatic_ipc_led_gpio_table,
+					    NULL);
+}
+
+static struct platform_driver simatic_ipc_led_gpio_elkhartlake_driver = {
+	.probe = simatic_ipc_leds_gpio_elkhartlake_probe,
+	.remove = simatic_ipc_leds_gpio_elkhartlake_remove,
+	.driver = {
+		.name = KBUILD_MODNAME,
+	},
+};
+module_platform_driver(simatic_ipc_led_gpio_elkhartlake_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" KBUILD_MODNAME);
+MODULE_SOFTDEP("pre: simatic-ipc-leds-gpio-core platform:elkhartlake-pinctrl");
+MODULE_AUTHOR("Henning Schild <henning.schild@siemens.com>");