livedisplay: Migrate to ioctl()

Change-Id: I2039c94eb3239f2d88ab67076b52f58493d9b43e

hidl/livedisplay/AntiFlicker.cpp

@@ -14,21 +14,9 @@
  * limitations under the License.
  */
 
-#define LOG_TAG "AntiFlickerService"
-
-#include <android-base/file.h>
-#include <android-base/strings.h>
+#include <fcntl.h>
 #include <livedisplay/oplus/AntiFlicker.h>
-
-using ::android::base::ReadFileToString;
-using ::android::base::Trim;
-using ::android::base::WriteStringToFile;
-
-namespace {
-
-constexpr const char* kDcDimmingPath = "/sys/kernel/oplus_display/dimlayer_bl_en";
-
-}  // anonymous namespace
+#include <oplus/oplus_display_panel.h>
 
 namespace vendor {
 namespace lineage {
@@ -36,19 +24,16 @@ namespace livedisplay {
 namespace V2_1 {
 namespace implementation {
 
+AntiFlicker::AntiFlicker() : mOplusDisplayFd(open("/dev/oplus_display", O_RDWR)) {}
+
 Return<bool> AntiFlicker::isEnabled() {
-    std::string tmp;
-    int32_t contents = 0;
-
-    if (ReadFileToString(kDcDimmingPath, &tmp)) {
-        contents = std::stoi(Trim(tmp));
-    }
-
-    return contents > 0;
+    unsigned int value;
+    return ioctl(mOplusDisplayFd, PANEL_IOCTL_GET_DIMLAYER_BL_EN, &value) == 0 && value > 0;
 }
 
 Return<bool> AntiFlicker::setEnabled(bool enabled) {
-    return WriteStringToFile(std::to_string(enabled), kDcDimmingPath, true);
+    unsigned int value = enabled;
+    return ioctl(mOplusDisplayFd, PANEL_IOCTL_SET_DIMLAYER_BL_EN, &value) == 0;
 }
 
 }  // namespace implementation