android: mm: Stub libhardware for build tests

Commit 66c618f378aa ("android: mm: generic: use
GRALLOC_HARDWARE_MODULE_ID") made libhardware a required dependency for
the Android camera HAL on non-Chrome OS platforms. This isn't an issue
for real devices, as Android provides libhardware, but it prevents
compile-testing the camera HAL on traditional Linux systems.

To restore the compile-test coverage, stub the libhardware function used
by the camera HAL when libhardware isn't found.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # meson build test
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/android/mm/libhardware_stub.c b/src/android/mm/libhardware_stub.c
new file mode 100644
index 00000000..00f15cd9
--- /dev/null
+++ b/src/android/mm/libhardware_stub.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+/*
+ * Copyright (C) 2023, Ideas on Board
+ *
+ * libhardware_stub.c - Android libhardware stub for test compilation
+ */
+
+#include <errno.h>
+
+#include <hardware/hardware.h>
+
+int hw_get_module(const char *id __attribute__((__unused__)),
+		  const struct hw_module_t **module)
+{
+	*module = NULL;
+	return -ENOTSUP;
+}