[PATCH 13/25] efw-downloader: config-rom: parse config rom to detect supported device

[Takashi Sakamoto]

In IEEE 1394 bus, each node exposes the range of address for data. The data
is used by the other node to identify the node. The data is named as
configuration rom.

This commit adds helper function to parse the configuration rom to detect
supported models.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 efw-downloader/src/config-rom.c | 60 +++++++++++++++++++++++++++++++++
 efw-downloader/src/config-rom.h | 26 ++++++++++++++
 efw-downloader/src/meson.build  |  2 ++
 3 files changed, 88 insertions(+)
 create mode 100644 efw-downloader/src/config-rom.c
 create mode 100644 efw-downloader/src/config-rom.h

diff --git a/efw-downloader/src/config-rom.c b/efw-downloader/src/config-rom.c
new file mode 100644
index 0000000..ce37037
--- /dev/null
+++ b/efw-downloader/src/config-rom.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2020 Takashi Sakamoto
+#include "config-rom.h"
+
+gboolean config_rom_detect_vendor_and_model(const guint8 *rom, guint32 *vendor_id, guint32 *model_id)
+{
+    gboolean detected = FALSE;
+
+    if (rom[24] != 0x03)
+        return FALSE;
+
+    *vendor_id = (rom[25] << 16) | (rom[26] << 8) | rom[27];
+
+    if (rom[32] != 0x17)
+        return FALSE;
+
+    *model_id = (rom[33] << 16) | (rom[34] << 8) | rom[35];
+
+    switch (*vendor_id) {
+    case VENDOR_LOUD:
+        switch (*model_id) {
+        case MODEL_ONYX400F:
+        case MODEL_ONYX1200F:
+            detected = TRUE;
+            break;
+        default:
+            break;
+        }
+        break;
+    case VENDOR_ECHO_AUDIO:
+        switch (*model_id) {
+        case MODEL_AF2:
+        case MODEL_AF4:
+        case MODEL_AF8:
+        case MODEL_AF8P:
+        case MODEL_AF12:
+        case MODEL_AF12HD:
+        case MODEL_AF12_APPLE:
+        case MODEL_FWHDMI:
+            detected = TRUE;
+            break;
+        default:
+            break;
+        }
+        break;
+    case VENDOR_GIBSON:
+        switch (*model_id) {
+        case MODELRIP:
+        case MODELAUDIOPUNK:
+            detected = TRUE;
+            break;
+        default:
+            break;
+        }
+    default:
+        break;
+    }
+
+    return detected;
+}
diff --git a/efw-downloader/src/config-rom.h b/efw-downloader/src/config-rom.h
new file mode 100644
index 0000000..59bdc14
--- /dev/null
+++ b/efw-downloader/src/config-rom.h
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2020 Takashi Sakamoto
+#ifndef __CONFIG_ROM_H__
+#define __CONFIG_ROM_H__
+
+#include <glib.h>
+
+#define VENDOR_LOUD         0x000ff2
+#define   MODEL_ONYX400F    0x00400f
+#define   MODEL_ONYX1200F   0x01200f
+#define VENDOR_ECHO_AUDIO   0x001486
+#define   MODEL_AF2         0x000af2
+#define   MODEL_AF4         0x000af4
+#define   MODEL_AF8         0x000af8
+#define   MODEL_AF8P        0x000af9
+#define   MODEL_AF12        0x00af12
+#define   MODEL_AF12HD      0x0af12d
+#define   MODEL_AF12_APPLE  0x0af12a
+#define   MODEL_FWHDMI      0x00afd1
+#define VENDOR_GIBSON       0x00075b
+#define   MODELRIP          0x00afb2
+#define   MODELAUDIOPUNK    0x00afb9
+
+gboolean config_rom_detect_vendor_and_model(const guint8 *rom, guint32 *vendor_id, guint32 *model_id);
+
+#endif
diff --git a/efw-downloader/src/meson.build b/efw-downloader/src/meson.build
index 07a6182..c006c8b 100644
--- a/efw-downloader/src/meson.build
+++ b/efw-downloader/src/meson.build
@@ -14,11 +14,13 @@ hinawa = dependency('hinawa',
 sources = [
   'main.c',
   'efw-proto.c',
+  'config-rom.c',
   'subcmd-device.c',
 ]
 
 headers = [
   'efw-proto.h',
+  'config-rom.h',
   'subcmds.h',
 ]
 
-- 
2.25.1