/*
 * Copyright (C) 2016 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 "gpio_manager.h"

#include <base/logging.h>

namespace android {

std::unique_ptr<GpioManager> g_gpio_manager;

GpioManager::GpioManager() {}

GpioManager::~GpioManager() {}

// static
GpioManager* GpioManager::GetGpioManager() {
  if (!g_gpio_manager) {
    g_gpio_manager.reset(new GpioManager());
  }
  return g_gpio_manager.get();
}

void GpioManager::ResetGpioManager() {
  g_gpio_manager.reset();
}

bool GpioManager::RegisterGpioSysfs(const std::string& name, uint32_t index) {
  if (sysfs_pins_.count(name))
    return false;
  sysfs_pins_[name].index = index;
  return true;
}

bool GpioManager::SetPinMux(const std::string& name, const std::string& mux) {
  if (!sysfs_pins_.count(name))
    return false;
  sysfs_pins_[name].mux = mux;
  return true;
}

std::vector<std::string> GpioManager::GetGpioPins() {
  std::vector<std::string> pins;
  for (auto& i : sysfs_pins_)
    pins.push_back(i.first);
  return pins;
}

bool GpioManager::HasGpio(const std::string& pin_name) {
  return sysfs_pins_.count(pin_name);
}

bool GpioManager::RegisterDriver(
    std::unique_ptr<GpioDriverInfoBase> driver_info) {
  std::string key = driver_info->Compat();
  driver_infos_[key] = std::move(driver_info);
  return true;
}

std::unique_ptr<GpioPin> GpioManager::OpenGpioPin(const std::string& name) {
  // Get the Pin  from the BSP.
  auto pin_it = sysfs_pins_.find(name);
  if (pin_it == sysfs_pins_.end()) {
    LOG(WARNING) << "GpioManager: Pin not found. " << name;
    return nullptr;
  }

  // Check its not alread in use
  if (pin_it->second.driver_) {
    LOG(WARNING) << "GpioManager: Pin in use. " << name;
    return nullptr;
  }

  // Find a driver.
  // Currently there is only hardcoded support for GPIOSYSFS
  auto driver_info_it = driver_infos_.find("GPIOSYSFS");

  // Fail if there is no driver.
  if (driver_info_it == driver_infos_.end()) {
    LOG(WARNING) << "GpioManager: Failed to find driver " << name;
    return nullptr;
  }

  std::unique_ptr<GpioDriverInterface> driver(driver_info_it->second->Probe());

  // Set pin mux
  if (!pin_it->second.mux.empty()) {
    PinMuxManager::GetPinMuxManager()->SetGpio(pin_it->second.mux);
  }

  if (!driver->Init(pin_it->second.index)) {
    LOG(WARNING) << "GpioManager: Failed to init driver " << name;
    return nullptr;
  }

  pin_it->second.driver_ = std::move(driver);

  return std::unique_ptr<GpioPin>(new GpioPin(&(pin_it->second)));
}

}  // namespace android