asoc: Compile audio driver UAPI as overlay

Install the audio UAPI header files for other modules and
userspace can use them.

Change-Id: Ib178f32bac46e3e95f78db33098d68b6ee834516
Signed-off-by: Meng Wang <mengw@codeaurora.org>

audio_kernel_headers.py

@@ -0,0 +1,96 @@
+# Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 as published by
+# the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import filecmp
+import os
+import re
+import subprocess
+import sys
+
+def run_headers_install(verbose, gen_dir, headers_install, unifdef, prefix, h):
+    if not h.startswith(prefix):
+        print('error: expected prefix [%s] on header [%s]' % (prefix, h))
+        return False
+
+    out_h = os.path.join(gen_dir, h[len(prefix):])
+    (out_h_dirname, out_h_basename) = os.path.split(out_h)
+    env = os.environ.copy()
+    env["LOC_UNIFDEF"] = unifdef
+    cmd = ["sh", headers_install, h, out_h]
+
+    if verbose:
+        print('run_headers_install: cmd is %s' % cmd)
+
+    result = subprocess.call(cmd, env=env)
+
+    if result != 0:
+        print('error: run_headers_install: cmd %s failed %d' % (cmd, result))
+        return False
+    return True
+
+def gen_audio_headers(verbose, gen_dir, headers_install, unifdef, audio_include_uapi):
+    error_count = 0
+    for h in audio_include_uapi:
+        audio_uapi_include_prefix = os.path.join(h.split('/include/uapi/')[0],
+                                                 'include',
+                                                 'uapi',
+                                                 'audio') + os.sep
+
+        if not run_headers_install(
+                verbose, gen_dir, headers_install, unifdef,
+                audio_uapi_include_prefix, h): error_count += 1
+    return error_count
+
+def main():
+    """Parse command line arguments and perform top level control."""
+    parser = argparse.ArgumentParser(
+            description=__doc__,
+            formatter_class=argparse.RawDescriptionHelpFormatter)
+
+    # Arguments that apply to every invocation of this script.
+    parser.add_argument(
+            '--verbose', action='store_true',
+            help='Print output that describes the workings of this script.')
+    parser.add_argument(
+            '--header_arch', required=True,
+            help='The arch for which to generate headers.')
+    parser.add_argument(
+            '--gen_dir', required=True,
+            help='Where to place the generated files.')
+    parser.add_argument(
+            '--audio_include_uapi', required=True, nargs='*',
+            help='The list of techpack/*/include/uapi header files.')
+    parser.add_argument(
+            '--headers_install', required=True,
+            help='The headers_install tool to process input headers.')
+    parser.add_argument(
+            '--unifdef',
+            required=True,
+            help='The unifdef tool used by headers_install.')
+
+    args = parser.parse_args()
+
+    if args.verbose:
+        print('header_arch [%s]' % args.header_arch)
+        print('gen_dir [%s]' % args.gen_dir)
+        print('audio_include_uapi [%s]' % args.audio_include_uapi)
+        print('headers_install [%s]' % args.headers_install)
+        print('unifdef [%s]' % args.unifdef)
+
+    return gen_audio_headers(args.verbose, args.gen_dir,
+            args.headers_install, args.unifdef, args.audio_include_uapi)
+
+if __name__ == '__main__':
+    sys.exit(main())