66550f9487
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com> Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <linux/spi/spidev.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include "spi.h"
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#define MAX_SIZE 64
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#define SPI_MAX_LENGTH 4096
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/**
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* A strucutre representing the SPI device
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*/
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struct _spi {
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/*@{*/
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int devfd; /**< File descriptor to SPI Device */
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/*@}*/
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};
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maa_spi_context
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maa_spi_init(int bus)
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{
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maa_spi_bus_t *spi = maa_check_spi(bus);
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if(bus < 0) {
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fprintf(stderr, "Failed. SPI platform Error\n");
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return NULL;
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}
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maa_spi_context dev = (maa_spi_context) malloc(sizeof(struct _spi));
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memset(dev, 0, sizeof(struct _spi));
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char path[MAX_SIZE];
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sprintf(path, "/dev/spidev%u.%u", spi->bus_id, spi->slave_s);
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dev->devfd = open(path, O_RDWR);
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if (dev->devfd < 0) {
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fprintf(stderr, "Failed opening SPI Device. bus:%s\n", path);
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free(dev);
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return NULL;
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}
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return dev;
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}
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maa_result_t
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maa_spi_mode(maa_spi_context dev, unsigned short mode)
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{
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return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
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}
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maa_result_t
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maa_spi_frequency(maa_spi_context dev, int hz)
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{
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return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
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}
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uint8_t
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maa_spi_write(maa_spi_context dev, uint8_t data)
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{
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struct spi_ioc_transfer msg;
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memset(&msg, 0, sizeof(msg));
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uint16_t length = 1;
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uint8_t recv = 0;
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msg.tx_buf = (unsigned long) &data;
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msg.rx_buf = (unsigned long) &recv;
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msg.speed_hz = 100000;
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msg.bits_per_word = 8;
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msg.delay_usecs = 0;
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msg.len = length;
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if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
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fprintf(stderr, "Failed to perform dev transfer\n");
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return -1;
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}
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return recv;
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}
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uint8_t*
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maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length)
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{
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struct spi_ioc_transfer msg;
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memset(&msg, 0, sizeof(msg));
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uint8_t* recv = malloc(sizeof(uint8_t) * length);
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msg.tx_buf = (unsigned long) data;
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msg.rx_buf = (unsigned long) recv;
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msg.speed_hz = 100000;
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msg.bits_per_word = 8;
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msg.delay_usecs = 0;
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msg.len = length;
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if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
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fprintf(stderr, "Failed to perform dev transfer\n");
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return NULL;
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}
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return recv;
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}
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maa_result_t
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maa_spi_stop(maa_spi_context dev)
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{
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return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
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}
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