InputEventLabels: Support lookup of evdev event codes by label Bug: 293327283 Test: atest CtsInputTestCases Change-Id: I846e1dc1eb450ea92d35ac7e403b06e2a029f25b

diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index 909bf08..44247c1 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h

@@ -69,6 +69,12 @@
 
     static EvdevEventLabel getLinuxEvdevLabel(int32_t type, int32_t code, int32_t value);
 
+    static std::optional<int> getLinuxEvdevEventTypeByLabel(const char* label);
+
+    static std::optional<int> getLinuxEvdevEventCodeByLabel(int32_t type, const char* label);
+
+    static std::optional<int> getLinuxEvdevInputPropByLabel(const char* label);
+
 private:
     InputEventLookup();
 

diff --git a/libs/input/InputEventLabels.cpp b/libs/input/InputEventLabels.cpp
index 50efac1..c218e1e 100644
--- a/libs/input/InputEventLabels.cpp
+++ b/libs/input/InputEventLabels.cpp

@@ -18,6 +18,7 @@
 
 #include <linux/input-event-codes.h>
 #include <linux/input.h>
+#include <strings.h>
 
 #define DEFINE_KEYCODE(key) { #key, AKEYCODE_##key }
 #define DEFINE_AXIS(axis) { #axis, AMOTION_EVENT_AXIS_##axis }
@@ -523,6 +524,14 @@
     return labels->name != nullptr ? labels->name : std::to_string(value);
 }
 
+std::optional<int> getValue(const label* labels, const char* searchLabel) {
+    if (labels == nullptr) return {};
+    while (labels->name != nullptr && ::strcasecmp(labels->name, searchLabel) != 0) {
+        labels++;
+    }
+    return labels->name != nullptr ? std::make_optional(labels->value) : std::nullopt;
+}
+
 const label* getCodeLabelsForType(int32_t type) {
     switch (type) {
         case EV_SYN:
@@ -572,4 +581,17 @@
     };
 }
 
+std::optional<int> InputEventLookup::getLinuxEvdevEventTypeByLabel(const char* label) {
+    return getValue(ev_labels, label);
+}
+
+std::optional<int> InputEventLookup::getLinuxEvdevEventCodeByLabel(int32_t type,
+                                                                   const char* label) {
+    return getValue(getCodeLabelsForType(type), label);
+}
+
+std::optional<int> InputEventLookup::getLinuxEvdevInputPropByLabel(const char* label) {
+    return getValue(input_prop_labels, label);
+}
+
 } // namespace android