drivers: hwinfo: add HWINFO driver for native_sim

Add a HWINFO driver for native_sim with support for getting the device
ID. Default device ID will be that returned from gethostid(), but the ID
can be overriden via the -hostid command line option.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

boards/native/native_sim/doc/index.rst

@@ -721,6 +721,7 @@ host libC (:kconfig:option:`CONFIG_EXTERNAL_LIBC`):
      FUSE, :ref:`Host based filesystem access <native_fuse_flash>`, :kconfig:option:`CONFIG_FUSE_FS_ACCESS`, All
      GPIO, GPIO emulator, :kconfig:option:`CONFIG_GPIO_EMUL`, All
      GPIO, SDL GPIO emulator, :kconfig:option:`CONFIG_GPIO_EMUL_SDL`, All
+     HWINFO, :kconfig:option:`CONFIG_HWINFO_NATIVE`, All
      I2C, I2C emulator, :kconfig:option:`CONFIG_I2C_EMUL`, All
      Input, Input SDL touch, :kconfig:option:`CONFIG_INPUT_SDL_TOUCH`, All
      Input, Linux evdev, :kconfig:option:`CONFIG_NATIVE_LINUX_EVDEV`, All

boards/native/native_sim/native_sim.yaml

@@ -23,6 +23,7 @@ supported:
   - spi
   - gpio
   - rtc
+  - hwinfo
 testing:
   default: true
 vendor: zephyr

boards/native/native_sim/native_sim_native_64.yaml

@@ -20,4 +20,5 @@ supported:
   - adc
   - gpio
   - rtc
+  - hwinfo
 vendor: zephyr

drivers/hwinfo/CMakeLists.txt

@@ -40,3 +40,13 @@ zephyr_library_sources_ifdef(CONFIG_HWINFO_SILABS_S2   hwinfo_silabs_series2.c)
 zephyr_library_sources_ifdef(CONFIG_HWINFO_SMARTBOND   hwinfo_smartbond.c)
 zephyr_library_sources_ifdef(CONFIG_HWINFO_STM32       hwinfo_stm32.c)
 # zephyr-keep-sorted-stop
+
+if(CONFIG_HWINFO_NATIVE)
+  if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL Linux)
+    zephyr_library_sources(hwinfo_native.c)
+
+    target_sources(native_simulator INTERFACE hwinfo_native_bottom.c)
+  else()
+    message(FATAL_ERROR "CONFIG_HWINFO_NATIVE is only available on Linux")
+  endif()
+endif()

drivers/hwinfo/Kconfig

@@ -43,6 +43,7 @@ rsource "Kconfig.mcux_src"
 rsource "Kconfig.mcux_src_rev2"
 rsource "Kconfig.mcux_syscon"
 rsource "Kconfig.mspm0"
+rsource "Kconfig.native"
 rsource "Kconfig.nrf"
 rsource "Kconfig.numaker"
 rsource "Kconfig.numaker_rmc"

drivers/hwinfo/Kconfig.native

@@ -0,0 +1,10 @@
+# Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+# SPDX-License-Identifier: Apache-2.0
+
+config HWINFO_NATIVE
+	bool "HWINFO driver for native_sim"
+	default y
+	depends on ARCH_POSIX
+	select HWINFO_HAS_DRIVER
+	help
+	  Enable native_sim HWINFO driver.

drivers/hwinfo/hwinfo_native.c

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <cmdline.h>
+#include <posix_native_task.h>
+#include <string.h>
+#include <zephyr/drivers/hwinfo.h>
+#include <zephyr/sys/byteorder.h>
+
+#include "hwinfo_native_bottom.h"
+
+static uint32_t native_hwinfo_device_id;
+static bool native_hwinfo_device_id_set;
+
+ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
+{
+
+	if (length > sizeof(native_hwinfo_device_id)) {
+		length = sizeof(native_hwinfo_device_id);
+	}
+
+	sys_put_be(buffer, &native_hwinfo_device_id, length);
+
+	return length;
+}
+
+static void native_hwinfo_gethostid(void)
+{
+	if (!native_hwinfo_device_id_set) {
+		native_hwinfo_device_id = native_hwinfo_gethostid_bottom();
+	}
+}
+
+static void native_hwinfo_device_id_was_set(char *argv, int offset)
+{
+	ARG_UNUSED(argv);
+	ARG_UNUSED(offset);
+
+	native_hwinfo_device_id_set = true;
+}
+
+static void native_hwinfo_add_options(void)
+{
+	static struct args_struct_t native_hwinfo_options[] = {
+		{
+			.option = "device_id",
+			.name = "id",
+			.type = 'u',
+			.dest = (void *)&native_hwinfo_device_id,
+			.call_when_found = native_hwinfo_device_id_was_set,
+			.descript = "A 32-bit integer value to use as HWINFO device ID. "
+				    "If not set, the host gethostid() output will be used.",
+		},
+		ARG_TABLE_ENDMARKER,
+	};
+
+	native_add_command_line_opts(native_hwinfo_options);
+}
+
+NATIVE_TASK(native_hwinfo_add_options, PRE_BOOT_1, 10);
+NATIVE_TASK(native_hwinfo_gethostid, PRE_BOOT_2, 10);

drivers/hwinfo/hwinfo_native_bottom.c

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+
+#include <stdint.h>
+#include <unistd.h>
+
+#include "hwinfo_native_bottom.h"
+
+long native_hwinfo_gethostid_bottom(void)
+{
+	return gethostid();
+}

drivers/hwinfo/hwinfo_native_bottom.h

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Henrik Brix Andersen <henrik@brixandersen.dk>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef DRIVERS_HWINFO_NATIVE_BOTTOM_H
+#define DRIVERS_HWINFO_NATIVE_BOTTOM_H
+
+#include <stdint.h>
+
+long native_hwinfo_gethostid_bottom(void);
+
+#endif /* DRIVERS_HWINFO_NATIVE_BOTTOM_H */