[RFC PATCH 1/2] acpi: Add script to extract ACPI device ids in the kernel

Add a script to extract all the supported acpi device ids
from kernel sources.

The list of IDs returned by the script can be used as a
reference to determine if a device declared in the ACPI namespace
with certain _HID/_CID is supported by the kernel or not.

Signed-off-by: Laura Nao <[email protected]>
---
 MAINTAINERS                   |  1 +
 scripts/acpi/acpi-extract-ids | 60 +++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100755 scripts/acpi/acpi-extract-ids

diff --git a/MAINTAINERS b/MAINTAINERS
index 27751573e314..7540316d82f5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -294,6 +294,7 @@ F:	drivers/pnp/pnpacpi/
 F:	include/acpi/
 F:	include/linux/acpi.h
 F:	include/linux/fwnode.h
+F:	scripts/acpi/acpi-extract-ids
 F:	tools/power/acpi/
 
 ACPI APEI
diff --git a/scripts/acpi/acpi-extract-ids b/scripts/acpi/acpi-extract-ids
new file mode 100755
index 000000000000..12c8e09281dd
--- /dev/null
+++ b/scripts/acpi/acpi-extract-ids
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Heavily inspired by the scripts/dtc/dt-extract-compatibles script,
+# adapted for the ACPI use case.
+#
+
+import os
+import glob
+import re
+import argparse
+
+
+def parse_acpi_device_ids(file):
+    """ Find all device ID strings in acpi_device_id struct """
+    id_list = []
+
+    with open(file, 'r', encoding='utf-8') as f:
+        data = f.read().replace('\n', '')
+
+        for m in re.finditer(r'acpi_device_id(\s+\S+)?\s+(\S+)\[\](\s+\S+)?\s*=\s*({.*?);', data):
+            id_list += re.findall(r'\"(\S+)\"', m[4])
+
+    return id_list
+
+
+def print_acpi_device_ids(filename, id_list):
+    if not id_list:
+        return
+    if show_filename:
+        compat_str = ' '.join(id_list)
+        print(filename + ": ID(s): " + compat_str)
+    else:
+        print(*id_list, sep='\n')
+
+
+def files_to_parse(path_args):
+    for f in path_args:
+        if os.path.isdir(f):
+            for filename in glob.iglob(f + "/**/*.c", recursive=True):
+                yield filename
+        else:
+            yield f
+
+
+show_filename = False
+
+if __name__ == "__main__":
+    ap = argparse.ArgumentParser()
+    ap.add_argument("cfile", type=str, nargs='*',
+                    help="C source files or directories to parse")
+    ap.add_argument('-H', '--with-filename',
+                    help="Print filename with device ids", action="store_true")
+    args = ap.parse_args()
+
+    show_filename = args.with_filename
+
+    for f in files_to_parse(args.cfile):
+        id_list = parse_acpi_device_ids(f)
+        print_acpi_device_ids(f, id_list)
-- 
2.30.2