drivers: Add hwinfo API

This commit adds a new hardware info API.
With this API it is possible to read out the device ID.

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>

drivers/hwinfo/CMakeLists.txt

@@ -0,0 +1,2 @@
+zephyr_sources_ifdef(CONFIG_USERSPACE   hwinfo_handlers.c)
+zephyr_sources_ifdef(CONFIG_HWINFO      hwinfo_weak_impl.c)

drivers/hwinfo/Kconfig

@@ -0,0 +1,16 @@
+# Kconfig -HW Info driver configuration options
+
+#
+# Copyright (c) 2019 Alexander Wachter
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menuconfig HWINFO
+	bool "Hardware Information driver"
+	help
+	  Enable hwinfo driver.
+
+if HWINFO
+
+endif

drivers/hwinfo/hwinfo_handlers.c

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2018 Alexander Wachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <syscall_handler.h>
+#include <hwinfo.h>
+
+Z_SYSCALL_HANDLER(hwinfo_get_device_id, buffer, length) {
+
+	Z_OOPS(Z_SYSCALL_MEMORY_WRITE(buffer, length));
+
+	return _impl_hwinfo_get_device_id((u8_t *)buffer, (size_t)length);
+}

drivers/hwinfo/hwinfo_weak_impl.c

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2018 Alexander Wachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <hwinfo.h>
+
+ssize_t __weak _impl_hwinfo_get_device_id(u8_t *buffer, size_t length)
+{
+	return -ENOTSUP;
+}