hostapd(hidl): Add HIDL interface skeletal code

Adding support for HIDL IPC in hostapd. This CL only adds the skeletal
framework for supporting HIDL interface implementation.

There is also a change in the hostapd.h to fix a C++ compilation error.

Bug: 36646171
Test: Compiles with CONFIG_CTRL_IFACE_HIDL=y in android.config
Change-Id: I4a7047a56f8e9be1ed51f2315df707ef5daddc11
diff --git a/hostapd/hidl/1.0/hostapd.h b/hostapd/hidl/1.0/hostapd.h
new file mode 100644
index 0000000..d4f632e
--- /dev/null
+++ b/hostapd/hidl/1.0/hostapd.h
@@ -0,0 +1,71 @@
+/*
+ * hidl interface for wpa_hostapd daemon
+ * Copyright (c) 2004-2018, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2018, Roshan Pius <rpius@google.com>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef HOSTAPD_HIDL_SUPPLICANT_H
+#define HOSTAPD_HIDL_SUPPLICANT_H
+
+#include <string>
+
+#include <android-base/macros.h>
+
+#include <android/hardware/wifi/hostapd/1.0/IHostapd.h>
+
+extern "C"
+{
+#include "utils/common.h"
+#include "utils/includes.h"
+#include "utils/wpa_debug.h"
+#include "ap/hostapd.h"
+}
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace hostapd {
+namespace V1_0 {
+namespace implementation {
+
+/**
+ * Implementation of the hostapd hidl object. This hidl
+ * object is used core for global control operations on
+ * hostapd.
+ */
+class Hostapd : public V1_0::IHostapd
+{
+public:
+	Hostapd(hapd_interfaces* interfaces);
+	~Hostapd() override = default;
+
+	// Hidl methods exposed.
+	Return<void> addAccessPoint(
+	    const IfaceParams& iface_params, const NetworkParams& nw_params,
+	    addAccessPoint_cb _hidl_cb) override;
+	Return<void> removeAccessPoint(
+	    const hidl_string& iface_name,
+	    removeAccessPoint_cb _hidl_cb) override;
+
+private:
+	// Corresponding worker functions for the HIDL methods.
+	HostapdStatus addAccessPointInternal(
+	    const IfaceParams& iface_params, const NetworkParams& nw_params);
+	HostapdStatus removeAccessPointInternal(const std::string& iface_name);
+
+	// Raw pointer to the global structure maintained by the core.
+	struct hapd_interfaces* interfaces_;
+
+	DISALLOW_COPY_AND_ASSIGN(Hostapd);
+};
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace hostapd
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android
+
+#endif  // HOSTAPD_HIDL_SUPPLICANT_H