blob: 27bfc1b2c77ac0806491d3adcd6345b9035e1dc1 [file] [log] [blame]
// 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
// 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 {
// Configure the Linux Initiator object for use with a bus specified by path,
// with a maximum bus-speed (in hz).
constexpr LinuxInitiator(const char* path, uint32_t max_speed_hz)
: path_(path), max_speed_hz_(max_speed_hz), fd_(-1) {}
// Implements pw::spi::Initiator
Status Configure(const Config& config) override;
Status WriteRead(ConstByteSpan write_buffer, ByteSpan read_buffer) override;
Status LazyInit();
const char* path_;
uint32_t max_speed_hz_;
int fd_;
// Linux userspace implementation of SPI ChipSelector
class LinuxChipSelector : public ChipSelector {
Status SetActive(bool active) override;
} // namespace pw::spi