gpio: add Intel Alder Lake-N GPIO driver

Add a GPIO driver for the Intel Alder Lake-N platform based on the generic
intelgpio framework. The driver provides pad group definitions for four GPIO
communities covering groups GPP_A through GPP_T, vGPIO and HVCMOS, and matches
ACPI hardware IDs INTC1056, INTC1057 and INTC1085. The kernel module build
infrastructure and the wiring into files.x86 are included.

Reviewed by:		vexeduxr
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Pull Request:		https://github.com/freebsd/freebsd-src/pull/2205

sys/conf/files.x86

@@ -99,6 +99,8 @@ dev/fdc/fdc_acpi.c		optional	fdc
 dev/fdc/fdc_isa.c		optional	fdc isa
 dev/gpio/bytgpio.c		optional	bytgpio
 dev/gpio/chvgpio.c		optional	chvgpio
+dev/gpio/intel/adlngpio.c	optional	adlngpio
+dev/gpio/intel/intelgpio.c	optional	adlngpio
 dev/hpt27xx/hpt27xx_os_bsd.c	optional	hpt27xx
 dev/hpt27xx/hpt27xx_osm_bsd.c	optional	hpt27xx
 dev/hpt27xx/hpt27xx_config.c	optional	hpt27xx

sys/dev/gpio/intel/adlngpio.c

@@ -0,0 +1,94 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 Beckhoff Automation GmbH & Co. KG
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/gpio.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <contrib/dev/acpica/include/acpi.h>
+
+#include <dev/acpica/acpivar.h>
+#include <dev/gpio/gpiobusvar.h>
+
+#include "intelgpio.h"
+
+#include "gpio_if.h"
+#include "opt_acpi.h"
+
+static const struct intelgpio_padgroup adln_com0_groups[] = {
+	{ .first_pad = 0, .npads = 26, .gpio_base = 0, .name = "GPP_B" },
+	{ .first_pad = 26, .npads = 16, .gpio_base = 32, .name = "GPP_T" },
+	{ .first_pad = 42, .npads = 25, .gpio_base = 64, .name = "GPP_A" },
+};
+
+static const struct intelgpio_padgroup adln_com1_groups[] = {
+	{ .first_pad = 67, .npads = 8, .gpio_base = 96, .name = "GPP_S" },
+	{ .first_pad = 75, .npads = 20, .gpio_base = 128, .name = "GPP_I" },
+	{ .first_pad = 95, .npads = 24, .gpio_base = 160, .name = "GPP_H" },
+	{ .first_pad = 119, .npads = 21, .gpio_base = 192, .name = "GPP_D" },
+	{ .first_pad = 140, .npads = 29, .gpio_base = 224, .name = "vGPIO" },
+};
+
+static const struct intelgpio_padgroup adln_com4_groups[] = {
+	{ .first_pad = 169, .npads = 24, .gpio_base = 256, .name = "GPP_C" },
+	{ .first_pad = 193, .npads = 25, .gpio_base = 288, .name = "GPP_F" },
+	{ .first_pad = 218,
+	    .npads = 6,
+	    .gpio_base = INTELGPIO_GPIO_NOMAP,
+	    .name = "HVCMOS" },
+	{ .first_pad = 224, .npads = 25, .gpio_base = 320, .name = "GPP_E" },
+};
+
+static const struct intelgpio_padgroup adln_com5_groups[] = {
+	{ .first_pad = 249, .npads = 8, .gpio_base = 352, .name = "GPP_R" },
+};
+
+static const struct intelgpio_community adln_communities[] = {
+	{ .ngroups = nitems(adln_com0_groups), .groups = adln_com0_groups },
+	{ .ngroups = nitems(adln_com1_groups), .groups = adln_com1_groups },
+	{ .ngroups = nitems(adln_com4_groups), .groups = adln_com4_groups },
+	{ .ngroups = nitems(adln_com5_groups), .groups = adln_com5_groups },
+};
+
+static char *adln_hids[] = { "INTC1056", "INTC1057", "INTC1085", NULL };
+
+static const struct intelgpio_platform adln_platform = {
+	.communities = adln_communities,
+	.ncommunities = nitems(adln_communities),
+	.hids = adln_hids,
+	.desc = "Intel Alder Lake-N GPIO",
+};
+
+static int
+adln_probe(device_t dev)
+{
+	return (intelgpio_probe(dev, &adln_platform));
+}
+
+static int
+adln_attach(device_t dev)
+{
+	return (intelgpio_attach(dev, &adln_platform));
+}
+
+static device_method_t adln_methods[] = {
+	DEVMETHOD(device_probe, adln_probe),
+	DEVMETHOD(device_attach, adln_attach),
+
+	DEVMETHOD_END
+};
+
+DEFINE_CLASS_1(gpio, adln_driver, adln_methods,
+    sizeof(struct intelgpio_softc), intelgpio_driver);
+
+DRIVER_MODULE(adlngpio, acpi, adln_driver, NULL, NULL);
+MODULE_DEPEND(adlngpio, acpi, 1, 1, 1);
+MODULE_DEPEND(adlngpio, gpiobus, 1, 1, 1);
+MODULE_VERSION(adlngpio, 1);
+ACPI_PNP_INFO(adln_hids);

sys/modules/Makefile

@@ -73,6 +73,7 @@ SUBDIR=	\
 	bridgestp \
 	bwi \
 	bwn \
+	${_adlngpio} \
 	${_bytgpio} \
 	${_chvgpio} \
 	cam \
@@ -797,6 +798,7 @@ _wdatwd=	wdatwd
 
 _aac=		aac
 _aacraid=	aacraid
+_adlngpio=	adlngpio
 .if ${MK_CRYPT} != "no" || defined(ALL_MODULES)
 _aesni=		aesni
 .endif

sys/modules/adlngpio/Makefile

@@ -0,0 +1,6 @@
+.PATH:	${SRCTOP}/sys/dev/gpio/intel
+KMOD=	adlngpio
+SRCS=	intelgpio.c adlngpio.c
+SRCS+=	acpi_if.h device_if.h bus_if.h gpio_if.h opt_acpi.h opt_platform.h
+
+.include <bsd.kmod.mk>