Add pan sysprop for nap

The `define` cannot be override on runtime and some target need to
disable nap (Eg: Wear OS)

Test: manual | set the property and check new behavior
Bug: 263323082
Merged-In: I27f9ec11fd4ef50ce2f66e3329dc0394257bcc2e
Change-Id: I27f9ec11fd4ef50ce2f66e3329dc0394257bcc2e
(cherry picked from commit a786e247)

sysprop/Android.bp

@@ -9,6 +9,7 @@ sysprop_library {
     "avrcp.sysprop",
     "bta.sysprop",
     "hfp.sysprop",
+    "pan.sysprop",
   ],
   property_owner: "Platform",
   api_packages: ["android.sysprop"],

sysprop/pan.sysprop

+module: "android.sysprop.bluetooth.Pan"
+owner: Platform
+
+prop {
+    api_name: "nap"
+    type: Boolean
+    scope: Internal
+    access: Readonly
+    prop_name: "bluetooth.pan.nap.enabled"
+}

system/btif/src/btif_pan.cc

@@ -34,6 +34,9 @@
 #include <linux/if_ether.h>
 #include <linux/if_tun.h>
 #include <net/if.h>
+#ifdef OS_ANDROID
+#include <pan.sysprop.h>
+#endif
 #include <poll.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
@@ -93,6 +96,16 @@ static btpan_interface_t pan_if = {
 
 const btpan_interface_t* btif_pan_get_interface() { return &pan_if; }
 
+static bool pan_nap_is_enabled() {
+#ifdef OS_ANDROID
+  // replace build time config PAN_NAP_DISABLED with runtime
+  static const bool nap_is_enabled =
+      android::sysprop::bluetooth::Pan::nap().value_or(true);
+  return nap_is_enabled;
+#else
+  return true;
+#endif
+}
 /*******************************************************************************
  **
  ** Function        btif_pan_init
@@ -118,9 +131,9 @@ void btif_pan_init() {
     btpan_cb.enabled = 1;
 
     int role = BTPAN_ROLE_NONE;
-#if PAN_NAP_DISABLED == FALSE
-    role |= BTPAN_ROLE_PANNAP;
-#endif
+    if (pan_nap_is_enabled()) {
+      role |= BTPAN_ROLE_PANNAP;
+    }
 #if PANU_DISABLED == FALSE
     role |= BTPAN_ROLE_PANU;
 #endif

system/internal_include/bt_target.h

@@ -814,10 +814,6 @@
 #define PAN_INCLUDED TRUE
 #endif
 
-#ifndef PAN_NAP_DISABLED
-#define PAN_NAP_DISABLED FALSE
-#endif
-
 #ifndef PANU_DISABLED
 #define PANU_DISABLED FALSE
 #endif