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// Copyright 2021 The Pigweed Authors
//
// 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
//
// https://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 <fcntl.h>
#include <linux/spi/spidev.h>
#include <linux/types.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "pw_log/log.h"
#include "pw_spi/chip_selector.h"
#include "pw_spi/device.h"
#include "pw_spi/initiator.h"
namespace pw::spi {
// Linux userspace implementation of the SPI Initiator
class LinuxInitiator : public Initiator {
public:
// Configure the Linux Initiator object for use with a bus file descriptor,
// and maximum bus-speed (in hz).
constexpr LinuxInitiator(int fd, uint32_t max_speed_hz)
: max_speed_hz_(max_speed_hz), fd_(fd) {}
~LinuxInitiator();
// Implements pw::spi::Initiator
Status Configure(const Config& config) override;
Status WriteRead(ConstByteSpan write_buffer, ByteSpan read_buffer) override;
private:
uint32_t max_speed_hz_;
int fd_;
};
// Linux userspace implementation of SPI ChipSelector
class LinuxChipSelector : public ChipSelector {
public:
Status SetActive(bool active) override;
};
} // namespace pw::spi
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