Add generic fastboot HAL implementation for pixel

Test: mmm, verify implementation present in recovery
Bug: 117837210

Change-Id: I5a983f4916de63d0d91e6a8addfb7fce80c1f843

3 files changed, 220 insertions, 0 deletions

diff --git a/fastboot/Android.bp b/fastboot/Android.bp
new file mode 100644
index 00000000..72ade19e
--- /dev/null
+++ b/fastboot/Android.bp
@@ -0,0 +1,32 @@
+//
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_library {
+    name: "android.hardware.fastboot@1.0-impl.pixel",
+    recovery: true,
+    srcs: [
+        "Fastboot.cpp",
+    ],
+    relative_install_path: "hw",
+    export_include_dirs: ["include"],
+    shared_libs: [
+        "libbase",
+        "libhidlbase",
+        "libhidltransport",
+        "libutils",
+        "libcutils",
+        "android.hardware.fastboot@1.0",
+    ],
+}
diff --git a/fastboot/Fastboot.cpp b/fastboot/Fastboot.cpp
new file mode 100644
index 00000000..f68c7c32
--- /dev/null
+++ b/fastboot/Fastboot.cpp
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fastboot/Fastboot.h"
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+
+namespace android {
+namespace hardware {
+namespace fastboot {
+namespace V1_0 {
+namespace implementation {
+
+constexpr const char* BRIGHTNESS_FILE = "/sys/class/backlight/panel0-backlight/brightness";
+constexpr int DISPLAY_BRIGHTNESS_DIM_THRESHOLD = 20;
+
+using  OEMCommandHandler = std::function<Result(const std::vector<std::string>&)>;
+
+Return<void> Fastboot::getPartitionType(const ::android::hardware::hidl_string& /* partitionName */,
+                                  getPartitionType_cb _hidl_cb) {
+    // For bluecross devices, all partitions need to return raw.
+    _hidl_cb(FileSystemType::RAW, { Status::SUCCESS, "" });
+    return Void();
+}
+
+Return<void> Fastboot::getVariant(getVariant_cb _hidl_cb) {
+    _hidl_cb("MSM USF", {Status::SUCCESS, "" });
+    return Void();
+}
+
+Return<void> Fastboot::getOffModeChargeState(getOffModeChargeState_cb _hidl_cb) {
+    constexpr const char* kDevinfoPath = "/dev/block/by-name/devinfo";
+    constexpr int kDevInfoOffModeChargeOffset = 15;
+
+    uint8_t off_mode_charge_status = 0;
+    android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(kDevinfoPath,
+                                                        O_RDONLY | O_BINARY)));
+    if (!android::base::ReadFullyAtOffset(fd, &off_mode_charge_status, 1 /* byte count */,
+                                          kDevInfoOffModeChargeOffset)) {
+        _hidl_cb(false,
+                 { Status::FAILURE_UNKNOWN, "Unable to read off-mode-charge state" });
+    } else {
+        _hidl_cb(off_mode_charge_status != 0, { Status::SUCCESS, "" });
+    }
+
+    return Void();
+}
+
+Return<void> Fastboot::getBatteryVoltageFlashingThreshold(
+        getBatteryVoltageFlashingThreshold_cb _hidl_cb) {
+    constexpr int kMinVoltageForFlashing = 3500;
+    _hidl_cb(kMinVoltageForFlashing, { Status::SUCCESS, "" });
+    return Void();
+}
+
+Result SetBrightnessLevel(const std::vector<std::string>& args) {
+    if (!args.size()) {
+        return { Status::INVALID_ARGUMENT, "Brightness level unspecified" };
+    }
+
+    auto level = std::stoi(args[0]);
+
+    if (level < 0 || level > 100)  {
+        return { Status::INVALID_ARGUMENT, "Brighness level must be between 0 and 100" };
+    }
+
+    // Avoid screen being dimmed too much.
+    if (level < DISPLAY_BRIGHTNESS_DIM_THRESHOLD) {
+        level = DISPLAY_BRIGHTNESS_DIM_THRESHOLD;
+    }
+
+    if (android::base::WriteStringToFile(std::to_string(level), BRIGHTNESS_FILE)) {
+            return { Status::SUCCESS, "" };
+    }
+
+    return { Status::FAILURE_UNKNOWN, "Unable to set display brightness" };
+}
+
+Return<void> Fastboot::doOemCommand(const ::android::hardware::hidl_string& oemCmdArgs,
+                          doOemCommand_cb _hidl_cb) {
+    const std::unordered_map<std::string, OEMCommandHandler> kOEMCmdMap = {
+        {FB_OEM_SET_BRIGHTNESS, SetBrightnessLevel},
+    };
+
+    auto args = android::base::Split(oemCmdArgs, " ");
+    if (args.size() < 2) {
+        _hidl_cb({ Status::INVALID_ARGUMENT, "Invalid OEM command" });
+        return Void();
+    }
+
+    // args[0] will be "oem", args[1] will be the command name
+    auto cmd_handler = kOEMCmdMap.find(args[1]);
+    if (cmd_handler != kOEMCmdMap.end()) {
+        _hidl_cb(cmd_handler->second(std::vector<std::string>(args.begin() + 2, args.end())));
+    } else {
+        _hidl_cb({ Status::FAILURE_UNKNOWN, "Unknown OEM command" });
+    }
+
+    return Void();
+}
+
+Fastboot::Fastboot() {}
+
+// Methods from ::android::hidl::base::V1_0::IBase follow.
+
+extern "C" IFastboot* HIDL_FETCH_IFastboot(const char* /* name */) {
+    return new Fastboot();
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace fastboot
+}  // namespace hardware
+}  // namespace android
diff --git a/fastboot/include/fastboot/Fastboot.h b/fastboot/include/fastboot/Fastboot.h
new file mode 100644
index 00000000..e5c0a114
--- /dev/null
+++ b/fastboot/include/fastboot/Fastboot.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <android/hardware/fastboot/1.0/IFastboot.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace fastboot {
+namespace V1_0 {
+namespace implementation {
+
+#define FB_OEM_SET_BRIGHTNESS "setbrightness"
+
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+
+struct Fastboot : public IFastboot {
+    Fastboot();
+    // Methods from ::android::hardware::fastboot::V1_0::IFastboot follow.
+    Return<void> getPartitionType(const ::android::hardware::hidl_string& partitionName,
+                                  getPartitionType_cb _hidl_cb) override;
+
+    Return<void> doOemCommand(const ::android::hardware::hidl_string& oemCmd,
+                              doOemCommand_cb _hidl_cb) override;
+    Return<void> getVariant(getVariant_cb _hidl_cb) override;
+    Return<void> getOffModeChargeState(getOffModeChargeState_cb _hidl_cb) override;
+    Return<void> getBatteryVoltageFlashingThreshold(getBatteryVoltageFlashingThreshold_cb _hidl_cb) override;
+};
+
+extern "C" IFastboot* HIDL_FETCH_IFastboot(const char* name);
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace fastboot
+}  // namespace hardware
+}  // namespace android