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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* SPIWriter.cpp
* This writes data to a SPI device.
* Copyright (C) 2013 Simon Newton
*/
#include <errno.h>
#include <fcntl.h>
#include <linux/spi/spidev.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <numeric>
#include <sstream>
#include <string>
#include "ola/io/IOUtils.h"
#include "ola/Logging.h"
#include "ola/network/SocketCloser.h"
#include "plugins/spi/SPIWriter.h"
namespace ola {
namespace plugin {
namespace spi {
using ola::thread::MutexLocker;
using std::string;
const uint8_t SPIWriter::SPI_BITS_PER_WORD = 8;
const uint8_t SPIWriter::SPI_MODE = 0;
const char SPIWriter::SPI_DEVICE_KEY[] = "device";
const char SPIWriter::SPI_ERROR_VAR[] = "spi-write-errors";
const char SPIWriter::SPI_WRITE_VAR[] = "spi-writes";
SPIWriter::SPIWriter(const string &spi_device,
const Options &options,
ExportMap *export_map)
: m_device_path(spi_device),
m_spi_speed(options.spi_speed),
m_cs_enable_high(options.cs_enable_high),
m_fd(-1) {
OLA_INFO << "Created SPI Writer " << spi_device << " with speed "
<< options.spi_speed << ", CE is " << m_cs_enable_high;
if (export_map) {
m_error_map_var = export_map->GetUIntMapVar(SPI_ERROR_VAR,
SPI_DEVICE_KEY);
(*m_error_map_var)[m_device_path] = 0;
m_write_map_var = export_map->GetUIntMapVar(SPI_WRITE_VAR,
SPI_DEVICE_KEY);
(*m_write_map_var)[m_device_path] = 0;
}
}
SPIWriter::~SPIWriter() {
if (m_fd >= 0)
close(m_fd);
}
bool SPIWriter::Init() {
int fd;
if (!ola::io::Open(m_device_path, O_RDWR, &fd)) {
return false;
}
ola::network::SocketCloser closer(fd);
uint8_t spi_mode = SPI_MODE;
if (m_cs_enable_high) {
spi_mode |= SPI_CS_HIGH;
}
if (ioctl(fd, SPI_IOC_WR_MODE, &spi_mode) < 0) {
OLA_WARN << "Failed to set SPI_IOC_WR_MODE for " << m_device_path;
return false;
}
uint8_t spi_bits_per_word = SPI_BITS_PER_WORD;
if (ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &spi_bits_per_word) < 0) {
OLA_WARN << "Failed to set SPI_IOC_WR_BITS_PER_WORD for " << m_device_path;
return false;
}
if (ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &m_spi_speed) < 0) {
OLA_WARN << "Failed to set SPI_IOC_WR_MAX_SPEED_HZ for " << m_device_path;
return false;
}
m_fd = closer.Release();
return true;
}
bool SPIWriter::WriteSPIData(const uint8_t *data, unsigned int length) {
struct spi_ioc_transfer spi;
memset(&spi, 0, sizeof(spi));
spi.tx_buf = reinterpret_cast<__u64>(data);
spi.len = length;
if (m_write_map_var) {
(*m_write_map_var)[m_device_path]++;
}
int bytes_written = ioctl(m_fd, SPI_IOC_MESSAGE(1), &spi);
if (bytes_written != static_cast<int>(length)) {
OLA_WARN << "Failed to write all the SPI data: " << strerror(errno);
if (m_error_map_var) {
(*m_error_map_var)[m_device_path]++;
}
return false;
}
return true;
}
} // namespace spi
} // namespace plugin
} // namespace ola
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