peripheralmanager/daemon/spi_driver_spidev.h

/*
 * 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.
 */

#ifndef SYSTEM_PERIPHERALMANAGER_DAEMON_SPI_DRIVER_SPIDEV_H_
#define SYSTEM_PERIPHERALMANAGER_DAEMON_SPI_DRIVER_SPIDEV_H_

#include <stdint.h>

#include <memory>

#include <base/macros.h>

#include "char_device.h"
#include "spi_driver.h"

namespace android {

class SpiDriverSpiDev : public SpiDriverInterface {
 public:
  explicit SpiDriverSpiDev(CharDeviceFactory* char_device_factory);
  ~SpiDriverSpiDev();

  static std::string Compat() { return "SPIDEV"; }

  bool Init(uint32_t bus_id, uint32_t cs) override;
  bool Transfer(const void* tx_data, void* rx_data, size_t len) override;
  bool SetFrequency(uint32_t speed_hz) override;
  bool SetMode(SpiMode mode) override;
  bool SetBitJustification(bool lsb_first) override;
  bool SetBitsPerWord(uint8_t bits_per_word) override;
  bool SetDelay(uint16_t delay_usecs) override;

 private:
  bool GetMaxFrequency(uint32_t* max_freq);

  int fd_;
  uint32_t bits_per_word_;
  uint32_t speed_hz_;
  uint16_t delay_usecs_;
  std::unique_ptr<CharDeviceInterface> char_interface_;

  // Used for unit testing and is null in production.
  // Ownership is in the test and outlives this class.
  CharDeviceFactory* char_device_factory_;

  DISALLOW_COPY_AND_ASSIGN(SpiDriverSpiDev);
};

}  // namespace android

#endif  // SYSTEM_PERIPHERALMANAGER_DAEMON_SPI_DEVICE_H_