mirror of
https://github.com/eddyem/ARMsingleboard.git
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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*
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* This file is part of the lightning project.
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* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <asm/ioctl.h>
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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#include <usefull_macros.h>
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uint8_t slaveaddr = 0;
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int i2c_read_reg(int fd, uint8_t regaddr, uint8_t *data){
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struct i2c_smbus_ioctl_data args;
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union i2c_smbus_data sd;
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args.read_write = I2C_SMBUS_READ;
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args.command = regaddr;
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args.size = I2C_SMBUS_BYTE_DATA;
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args.data = &sd;
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if(ioctl(fd, I2C_SMBUS, &args) < 0){
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WARNX("Can't read reg %d", regaddr);
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LOGWARN("Can't read reg %d", regaddr);
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return FALSE;
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}
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*data = sd.byte;
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return TRUE;
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}
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int i2c_write_reg(int fd, uint8_t regaddr, uint8_t data){
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struct i2c_smbus_ioctl_data args;
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union i2c_smbus_data sd;
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sd.byte = data;
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args.read_write = I2C_SMBUS_WRITE;
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args.command = regaddr;
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args.size = I2C_SMBUS_BYTE_DATA;
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args.data = &sd;
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if(ioctl(fd, I2C_SMBUS, &args) < 0){
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WARNX("Can't write reg %d", regaddr);
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LOGWARN("Can't write reg %d", regaddr);
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return FALSE;
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}
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return TRUE;
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}
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int i2c_set_slave_address(int fd, uint8_t addr){
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if(addr == slaveaddr) return TRUE;
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if(ioctl (fd, I2C_SLAVE, addr) < 0){
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WARNX("Can't set slave address %d", addr);
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LOGWARN("Can't set slave address %d", addr);
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return FALSE;
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}
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slaveaddr = addr;
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return TRUE;
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}
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int i2c_open(const char *path){
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return open(path, O_RDWR);
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}
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