Add an API to find out whether there is a vibrator.

Change-Id: Ic0d967bc72c542fc6a97331c9197114f3f571c08

2 files changed, 24 insertions, 0 deletions

diff --git a/include/hardware_legacy/vibrator.h b/include/hardware_legacy/vibrator.h
index 15fd942..7994f62 100644
--- a/include/hardware_legacy/vibrator.h
+++ b/include/hardware_legacy/vibrator.h
@@ -22,6 +22,13 @@ extern "C" {
 #endif
 
 /**
+ * Return whether the device has a vibrator.
+ *
+ * @return 1 if a vibrator exists, 0 if it doesn't.
+ */
+int vibrator_exists();
+
+/**
  * Turn on vibrator
  *
  * @param timeout_ms number of milliseconds to vibrate
diff --git a/vibrator/vibrator.c b/vibrator/vibrator.c
index 22cc506..f946ce1 100644
--- a/vibrator/vibrator.c
+++ b/vibrator/vibrator.c
@@ -23,6 +23,23 @@
 
 #define THE_DEVICE "/sys/class/timed_output/vibrator/enable"
 
+int vibrator_exists()
+{
+    int fd;
+
+#ifdef QEMU_HARDWARE
+    if (qemu_check()) {
+        return 1;
+    }
+#endif
+
+    fd = open(THE_DEVICE, O_RDWR);
+    if(fd < 0)
+        return 0;
+    close(fd);
+    return 1;
+}
+
 static int sendit(int timeout_ms)
 {
     int nwr, ret, fd;