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/* sx150x - minimal SX150x I2C GPIO expander driver
* (C) 2015 by sysmocom - s.f.m.c. GmbH, Author: Harald Welte
* All Rights Reserved
*
* 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 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <limits.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
/* #include <linux/i2c-dev.h> */
#include "i2c-dev.h"
#include "sx150x.h"
enum sx150x_reg {
SX150x_REG_DATA = 0x00,
SX150x_REG_DIRECTION = 0x01,
SX150x_REG_PULL_UP = 0x02,
SX150x_REG_PULL_DOWN = 0x03,
/* resered */
SX150x_REG_IRQ_MASK = 0x05,
SX150x_REG_SENSE_HIGH = 0x06,
SX150x_REG_SENSE_LOW = 0x07,
SX150x_REG_IRQ_SOURCE = 0x08,
SX150x_REG_EVENT_STATUS = 0x09,
/* what about 0x0a - 0x0f? */
SX150x_REG_PLD_MODE = 0x10,
SX150x_REG_PLD_TABLE0 = 0x11,
SX150x_REG_PLD_TABLE1 = 0x12,
SX150x_REG_PLD_TABLE2 = 0x13,
SX150x_REG_PLD_TABLE3 = 0x13,
SX150x_REG_PLD_TABLE4 = 0x13,
SX150x_REG_ADVANCED = 0xAB,
};
int sx150x_gpio_direction_set(int fd, int gpio, enum sx150x_direction dir)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_DIRECTION);
if (rc < 0)
return rc;
rc &= ~(1 << gpio);
rc |= (dir << gpio);
return i2c_smbus_write_byte_data(fd, SX150x_REG_DIRECTION, rc);
}
int sx150x_gpio_direction_get(int fd, int gpio)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_DIRECTION);
if (rc < 0)
return rc;
return (rc & (1 << gpio));
}
int sx150x_gpio_pull_up_set(int fd, int gpio, int on)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_PULL_UP);
if (rc < 0)
return rc;
if (on)
rc |= (1 << gpio);
else
rc &= ~(1 << gpio);
return i2c_smbus_write_byte_data(fd, SX150x_REG_PULL_UP, rc);
}
int sx150x_gpio_pull_down_set(int fd, int gpio, int on)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_PULL_DOWN);
if (rc < 0)
return rc;
if (on)
rc |= (1 << gpio);
else
rc &= ~(1 << gpio);
return i2c_smbus_write_byte_data(fd, SX150x_REG_PULL_DOWN, rc);
}
int sx150x_gpio_set(int fd, int gpio, int high)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_DATA);
if (rc < 0)
return rc;
if (high)
rc |= (1 << gpio);
else
rc &= ~(1 << gpio);
return i2c_smbus_write_byte_data(fd, SX150x_REG_DATA, rc);
}
int sx150x_gpio_get(int fd, int gpio)
{
int rc;
rc = i2c_smbus_read_byte_data(fd, SX150x_REG_DATA);
if (rc < 0)
return rc;
return (rc & (1 << gpio));
}
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