From b8245a550752ed3826902f63a75203c67282ace7 Mon Sep 17 00:00:00 2001
From: Joel Challis <git@zvecr.com>
Date: Mon, 18 Apr 2022 11:51:40 +0100
Subject: [PATCH] Expose API for hardware unique ID (#16869)

---
 .../onekey/keymaps/hardware_id/keymap.c       | 28 +++++++++++++++++++
 platforms/arm_atsam/hardware_id.c             |  9 ++++++
 platforms/avr/hardware_id.c                   | 13 +++++++++
 platforms/chibios/hardware_id.c               | 15 ++++++++++
 platforms/common.mk                           |  1 +
 platforms/hardware_id.h                       | 18 ++++++++++++
 platforms/test/hardware_id.c                  |  9 ++++++
 7 files changed, 93 insertions(+)
 create mode 100644 keyboards/handwired/onekey/keymaps/hardware_id/keymap.c
 create mode 100644 platforms/arm_atsam/hardware_id.c
 create mode 100644 platforms/avr/hardware_id.c
 create mode 100644 platforms/chibios/hardware_id.c
 create mode 100644 platforms/hardware_id.h
 create mode 100644 platforms/test/hardware_id.c

diff --git a/keyboards/handwired/onekey/keymaps/hardware_id/keymap.c b/keyboards/handwired/onekey/keymaps/hardware_id/keymap.c
new file mode 100644
index 00000000000..bcec8b3ca1b
--- /dev/null
+++ b/keyboards/handwired/onekey/keymaps/hardware_id/keymap.c
@@ -0,0 +1,28 @@
+#include QMK_KEYBOARD_H
+#include "hardware_id.h"
+#include <stdio.h>
+enum custom_keycodes {
+    DUMP_ID = SAFE_RANGE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    LAYOUT_ortho_1x1(DUMP_ID)
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case DUMP_ID:
+            if (record->event.pressed) {
+                hardware_id_t id = get_hardware_id();
+                char buffer[100];
+                sprintf(buffer, "ID:%lu:%lu:%lu:%lu\n", id.data[0], id.data[1], id.data[2], id.data[3]);
+#ifdef CONSOLE_ENABLE
+                    printf(buffer);
+#else
+                    send_string(buffer);
+#endif
+            }
+            break;
+    }
+    return false;
+};
diff --git a/platforms/arm_atsam/hardware_id.c b/platforms/arm_atsam/hardware_id.c
new file mode 100644
index 00000000000..8b3b35a4924
--- /dev/null
+++ b/platforms/arm_atsam/hardware_id.c
@@ -0,0 +1,9 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "hardware_id.h"
+
+hardware_id_t get_hardware_id(void) {
+    hardware_id_t id = {0};
+    return id;
+}
diff --git a/platforms/avr/hardware_id.c b/platforms/avr/hardware_id.c
new file mode 100644
index 00000000000..073834c19cb
--- /dev/null
+++ b/platforms/avr/hardware_id.c
@@ -0,0 +1,13 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <avr/boot.h>
+#include "hardware_id.h"
+
+hardware_id_t get_hardware_id(void) {
+    hardware_id_t id = {0};
+    for (uint8_t i = 0; i < 10; i += 1) {
+        ((uint8_t*)&id)[i] = boot_signature_byte_get(i + 0x0E);
+    }
+    return id;
+}
diff --git a/platforms/chibios/hardware_id.c b/platforms/chibios/hardware_id.c
new file mode 100644
index 00000000000..888a2754657
--- /dev/null
+++ b/platforms/chibios/hardware_id.c
@@ -0,0 +1,15 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <ch.h>
+#include "hardware_id.h"
+
+hardware_id_t get_hardware_id(void) {
+    hardware_id_t id = {0};
+#ifdef UID_BASE
+    id.data[0] = (uint32_t)(*((uint32_t *)UID_BASE));
+    id.data[1] = (uint32_t)(*((uint32_t *)(UID_BASE + 4)));
+    id.data[1] = (uint32_t)(*((uint32_t *)(UID_BASE + 8)));
+#endif
+    return id;
+}
diff --git a/platforms/common.mk b/platforms/common.mk
index 2a1fc8d377b..693bdc8cf0e 100644
--- a/platforms/common.mk
+++ b/platforms/common.mk
@@ -2,6 +2,7 @@ PLATFORM_COMMON_DIR = $(PLATFORM_PATH)/$(PLATFORM_KEY)
 
 TMK_COMMON_SRC +=	\
 	$(PLATFORM_PATH)/suspend.c \
+	$(PLATFORM_COMMON_DIR)/hardware_id.c \
 	$(PLATFORM_COMMON_DIR)/platform.c \
 	$(PLATFORM_COMMON_DIR)/suspend.c \
 	$(PLATFORM_COMMON_DIR)/timer.c \
diff --git a/platforms/hardware_id.h b/platforms/hardware_id.h
new file mode 100644
index 00000000000..0c161863d64
--- /dev/null
+++ b/platforms/hardware_id.h
@@ -0,0 +1,18 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stdint.h>
+
+/** \brief Storage for a hardware ID
+ *
+ * Ensure this is sized to cover all hardware scenarios
+ */
+typedef struct hardware_id_t {
+    uint32_t data[4];
+} hardware_id_t;
+
+/** \brief Query the devices "unique" ID
+ */
+hardware_id_t get_hardware_id(void);
diff --git a/platforms/test/hardware_id.c b/platforms/test/hardware_id.c
new file mode 100644
index 00000000000..8b3b35a4924
--- /dev/null
+++ b/platforms/test/hardware_id.c
@@ -0,0 +1,9 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "hardware_id.h"
+
+hardware_id_t get_hardware_id(void) {
+    hardware_id_t id = {0};
+    return id;
+}