daemon/i2c_manager.cc

/*
 * 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 "i2c_manager.h"

#include <base/logging.h>

#include "pin_mux_manager.h"

namespace android {

std::unique_ptr<I2cManager> g_i2c_manager;

I2cManager::I2cManager() {}

I2cManager::~I2cManager() {}

// static
I2cManager* I2cManager::GetI2cManager() {
  if (!g_i2c_manager) {
    g_i2c_manager.reset(new I2cManager());
  }
  return g_i2c_manager.get();
}

// static
void I2cManager::ResetI2cManager() {
  g_i2c_manager.reset();
}

bool I2cManager::RegisterI2cDevBus(const std::string& name,
                                   uint32_t bus) {
  if (i2cdev_buses_.count(name))
    return false;
  i2cdev_buses_.emplace(name, I2cDevBus(bus));
  return true;
}

std::vector<std::string> I2cManager::GetI2cDevBuses() {
  std::vector<std::string> buses;
  for (auto& i : i2cdev_buses_)
    buses.push_back(i.first);
  return buses;
}

bool I2cManager::HasI2cDevBus(const std::string& name) {
  return i2cdev_buses_.count(name);
}

bool I2cManager::RegisterDriver(
    std::unique_ptr<I2cDriverInfoBase> driver_info) {
  std::string key = driver_info->Compat();
  driver_infos_[key] = std::move(driver_info);
  return true;
}

bool I2cManager::SetPinMux(const std::string& name, const std::string& mux) {
  auto bus_it = i2cdev_buses_.find(name);
  if (bus_it == i2cdev_buses_.end())
    return false;
  bus_it->second.mux = mux;
  bus_it->second.mux_group = mux;
  return true;
}

bool I2cManager::SetPinMuxWithGroup(const std::string& name,
                                    const std::string& mux,
                                    const std::string& group) {
  auto bus_it = i2cdev_buses_.find(name);
  if (bus_it == i2cdev_buses_.end())
    return false;
  bus_it->second.mux = mux;
  bus_it->second.mux_group = group;
  return true;
}

std::unique_ptr<I2cDevice> I2cManager::OpenI2cDevice(const std::string& name, uint32_t address) {
  LOG(INFO) << "OpenI2cDevice " << name << " " << address;
  // Get the Bus from the BSP.
  auto bus_it = i2cdev_buses_.find(name);
  if (bus_it == i2cdev_buses_.end())
    return nullptr;

  // Check its not already in use
  if (bus_it->second.driver_.count(address)) {
    return nullptr;
  }

  // Find a driver.
  // Currently there is only hardcoded support for I2CDEV
  auto driver_info_it = driver_infos_.find("I2CDEV");

  // Fail if there is no driver.
  if (driver_info_it == driver_infos_.end())
    return nullptr;

  std::unique_ptr<I2cDriverInterface> driver(driver_info_it->second->Probe());

  if (!driver->Init(bus_it->second.bus, address))
    return nullptr;

  // Set Pin muxing.
  if (!bus_it->second.mux.empty()) {
    PinMuxManager::GetPinMuxManager()->SetSource(bus_it->second.mux,
                                                 bus_it->second.mux_group);
  }

  bus_it->second.driver_[address] = std::move(driver);

  return std::unique_ptr<I2cDevice>(new I2cDevice(&(bus_it->second), address));
}

}  // namespace android