From f92a01172c8ef68c0b2f80044d3f67b990297f4d Mon Sep 17 00:00:00 2001
From: Arian <arian.kulmer@web.de>
Date: Thu, 5 May 2022 23:40:07 +0200
Subject: [PATCH] sm6150-common: Add udfps handler lib

Change-Id: Ib837e4a70015dc24d431458a1cce5b86e87816a9
---
 udfps/Android.bp       |  17 +++++++
 udfps/UdfpsHandler.cpp | 112 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 129 insertions(+)
 create mode 100644 udfps/Android.bp
 create mode 100644 udfps/UdfpsHandler.cpp

diff --git a/udfps/Android.bp b/udfps/Android.bp
new file mode 100644
index 0000000..41adbf2
--- /dev/null
+++ b/udfps/Android.bp
@@ -0,0 +1,17 @@
+//
+// Copyright (C) 2022 The LineageOS Project
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+cc_library {
+    name: "libudfpshandler",
+    vendor: true,
+    srcs: ["UdfpsHandler.cpp"],
+    shared_libs: [
+        "libbase",
+    ],
+    header_libs: [
+        "//hardware/xiaomi:xiaomifingerprint_headers",
+    ],
+}
diff --git a/udfps/UdfpsHandler.cpp b/udfps/UdfpsHandler.cpp
new file mode 100644
index 0000000..788631e
--- /dev/null
+++ b/udfps/UdfpsHandler.cpp
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define LOG_TAG "UdfpsHandler.xiaomi_sm6150"
+
+#include "UdfpsHandler.h"
+
+#include <android-base/logging.h>
+#include <android-base/unique_fd.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <unistd.h>
+#include <thread>
+
+// Fingerprint hwmodule commands
+#define COMMAND_NIT 10
+#define PARAM_NIT_UDFPS 1
+#define PARAM_NIT_NONE 0
+
+// Touchfeature
+#define TOUCH_DEV_PATH "/dev/xiaomi-touch"
+#define TOUCH_UDFPS_ENABLE 10
+#define TOUCH_MAGIC 0x5400
+#define TOUCH_IOC_SETMODE TOUCH_MAGIC + 0
+#define UDFPS_STATUS_ON 1
+#define UDFPS_STATUS_OFF -1
+
+#define FOD_UI_PATH "/sys/devices/platform/soc/soc:qcom,dsi-display/fod_ui"
+
+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';
+}
+
+class XiaomiUdfpsHander : public UdfpsHandler {
+  public:
+    void init(fingerprint_device_t* device) {
+        mDevice = device;
+        touch_fd_ = android::base::unique_fd(open(TOUCH_DEV_PATH, O_RDWR));
+
+        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;
+                }
+
+                mDevice->extCmd(mDevice, COMMAND_NIT,
+                                readBool(fd) ? PARAM_NIT_UDFPS : PARAM_NIT_NONE);
+
+                int arg[2] = {TOUCH_UDFPS_ENABLE,
+                              readBool(fd) ? UDFPS_STATUS_ON : UDFPS_STATUS_OFF};
+                ioctl(touch_fd_.get(), TOUCH_IOC_SETMODE, &arg);
+            }
+        }).detach();
+    }
+
+    void onFingerDown(uint32_t /*x*/, uint32_t /*y*/, float /*minor*/, float /*major*/) {
+        // nothing
+    }
+
+    void onFingerUp() {
+        // nothing
+    }
+
+  private:
+    fingerprint_device_t* mDevice;
+    android::base::unique_fd touch_fd_;
+};
+
+static UdfpsHandler* create() {
+    return new XiaomiUdfpsHander();
+}
+
+static void destroy(UdfpsHandler* handler) {
+    delete handler;
+}
+
+extern "C" UdfpsHandlerFactory UDFPS_HANDLER_FACTORY = {
+        .create = create,
+        .destroy = destroy,
+};