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/*
* Copyright 2021 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "driver/i2c.h"
#include "arch.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>
#include <i2c/smbus.h>
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define I2C_BUS TOSTRING(CONFIG_arch_posix_driver_i2c_bus)
signed char I2C::setup()
{
return 0;
}
signed char I2C::xmit(unsigned char address,
unsigned char tx_len, unsigned char *tx_buf,
unsigned char rx_len, unsigned char *rx_buf)
{
struct i2c_msg messages[2];
struct i2c_rdwr_ioctl_data transaction;
transaction.nmsgs = 0;
transaction.msgs = messages;
if (tx_len) {
messages[transaction.nmsgs].addr = address;
messages[transaction.nmsgs].flags = 0;
messages[transaction.nmsgs].len = tx_len;
messages[transaction.nmsgs].buf = tx_buf;
transaction.nmsgs++;
}
if (rx_len) {
messages[transaction.nmsgs].addr = address;
messages[transaction.nmsgs].flags = I2C_M_RD;
messages[transaction.nmsgs].len = rx_len;
messages[transaction.nmsgs].buf = rx_buf;
transaction.nmsgs++;
}
int fh = open(i2cbus, O_RDWR);
if (fh < 0) {
return -1;
}
if (ioctl(fh, I2C_RDWR, &transaction) == -1) {
return -1;
}
close(fh);
return 0;
}
I2C i2c(I2C_BUS);
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