sm8350-common: fod: add thread listening for fod_ui sysfs event

fod/FingerprintInscreen.cpp

@@ -21,6 +21,11 @@
 #include <android-base/logging.h>
 #include <fstream>
 #include <cmath>
+#include <thread>
+
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/stat.h>
 
 #define FINGERPRINT_ACQUIRED_VENDOR 6
 
@@ -32,6 +37,8 @@
 #define FOD_STATUS_ON 1
 #define FOD_STATUS_OFF 0
 
+#define FOD_UI_PATH "/sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_ui"
+
 #define FOD_HBM_PATH "/sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_hbm"
 #define FOD_HBM_ON 1
 #define FOD_HBM_OFF 0
@@ -48,6 +55,25 @@ static void set(const std::string& path, const T& value) {
     file << value;
 }
 
+static bool readBool(int fd) {
+    char c;
+    int rc;
+
+    rc = lseek(fd, 0, SEEK_SET);
+    if (rc) {
+        LOG(ERROR) << "failed to seek fd, err: " << rc;
+        return false;
+    }
+
+    rc = read(fd, &c, sizeof(char));
+    if (rc != 1) {
+        LOG(ERROR) << "failed to read bool from fd, err: " << rc;
+        return false;
+    }
+
+    return c != '0';
+}
+
 } // anonymous namespace
 
 namespace vendor {
@@ -60,6 +86,31 @@ namespace implementation {
 
 FingerprintInscreen::FingerprintInscreen() {
     xiaomiFingerprintService = IXiaomiFingerprint::getService();
+
+    std::thread([this]() {
+        int fd = open(FOD_UI_PATH, O_RDONLY);
+        if (fd < 0) {
+            LOG(ERROR) << "failed to open fd, err: " << fd;
+            return;
+        }
+
+        struct pollfd fodUiPoll = {
+            .fd = fd,
+            .events = POLLERR | POLLPRI,
+            .revents = 0,
+        };
+
+        while (true) {
+            int rc = poll(&fodUiPoll, 1, -1);
+            if (rc < 0) {
+                LOG(ERROR) << "failed to poll fd, err: " << rc;
+                continue;
+            }
+
+            xiaomiFingerprintService->extCmd(COMMAND_NIT,
+                    readBool(fd) ? PARAM_NIT_FOD : PARAM_NIT_NONE);
+        }
+    }).detach();
 }
 
 Return<int32_t> FingerprintInscreen::getPositionX() {
@@ -94,12 +145,10 @@ Return<void> FingerprintInscreen::onRelease() {
 
 Return<void> FingerprintInscreen::onShowFODView() {
     set(FOD_STATUS_PATH, FOD_STATUS_ON);
-    xiaomiFingerprintService->extCmd(COMMAND_NIT, PARAM_NIT_FOD);
     return Void();
 }
 
 Return<void> FingerprintInscreen::onHideFODView() {
-    xiaomiFingerprintService->extCmd(COMMAND_NIT, PARAM_NIT_NONE);
     set(FOD_STATUS_PATH, FOD_STATUS_OFF);
     return Void();
 }

fod/vendor.lineage.biometrics.fingerprint.inscreen@1.0-service.xiaomi_sm8350.rc

 on boot
     chown system system /sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_hbm
+    chown system system /sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_ui
     chown system system /sys/devices/virtual/touch/tp_dev/fod_status
 
 service fingerprint-inscreen-1-0 /vendor/bin/hw/vendor.lineage.biometrics.fingerprint.inscreen@1.0-service.xiaomi_sm8350

sepolicy/vendor/file_contexts

@@ -12,4 +12,5 @@
 # FOD
 /vendor/bin/hw/vendor\.lineage\.biometrics\.fingerprint\.inscreen@1.0-service\.xiaomi_sm8350            u:object_r:hal_lineage_fod_default_exec:s0
 /sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_hbm     u:object_r:vendor_sysfs_fod:s0
+/sys/devices/platform/soc/soc:qcom,dsi-display-primary/fod_ui      u:object_r:vendor_sysfs_fod:s0
 /sys/devices/virtual/touch/tp_dev/fod_status                       u:object_r:vendor_sysfs_fod:s0