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/*
* apds990x proximity sensor testing module
* Copyright (C) 2013 Andi Shyti <andi@etezian.org>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#define MAX_N 100
#define ENABLE "1"
#define DISABLE "0"
struct device {
unsigned int n;
int prox;
char *power;
char *prox_en;
char *prox_raw;
};
struct device apds990x_dev = {
.n = 10,
.power = "/sys/class/i2c-adapter/i2c-12/12-0039/power_state",
.prox_en = "/sys/class/i2c-adapter/i2c-12/12-0039/prox0_raw_en",
.prox_raw = "/sys/class/i2c-adapter/i2c-12/12-0039/prox0_raw",
};
int write_file(char *fname, const char *val)
{
int fd;
ssize_t ret;
int retval = 0;
fd = open(fname, O_WRONLY);
if (fd < 0) {
retval = errno;
fprintf(stderr, "%s: %s\n", fname, strerror(errno));
return retval;
}
ret = write(fd, val, 1);
if (ret != 1) {
retval = errno;
fprintf(stderr, "%s: %s\n", fname, strerror(errno));
close(fd);
return retval;
}
fd = close(fd);
if (fd < 0) {
retval = errno;
fprintf(stderr, "%s: %s\n", fname, strerror(errno));
}
return retval;
}
int read_proxy(void)
{
unsigned int i;
int fd, retval = 0;
ssize_t ret;
char val[6];
for (i = 0; i < apds990x_dev.n; i++) {
sleep(1);
fd = open(apds990x_dev.prox_raw, O_RDONLY);
if (fd < 0) {
retval = errno;
fprintf(stderr, "%s: %s\n", apds990x_dev.prox_raw,
strerror(errno));
return retval;
}
ret = read(fd, val, sizeof(val));
if (ret < 0) {
retval = errno;
fprintf(stderr, "%s: %s\n",
apds990x_dev.prox_raw, strerror(errno));
break;
}
/* replace EOF with \n */
val[ret-1] = '\n';
apds990x_dev.prox = (int) strtol(val, NULL, 10);
printf("%d\n", apds990x_dev.prox);
fd = close(fd);
if (fd < 0) {
retval = errno;
fprintf(stderr, "%s: %s\n", apds990x_dev.prox_raw,
strerror(errno));
break;
}
}
return retval;
}
void print_usage(char *name)
{
printf("Usage: %s [-n <number>]\n", name);
printf("\n");
printf(" -n <number> - number of readings on the device\n");
printf(" -h, --help - print help menu\n");
}
int parse_cmdline(int argc, char *argv[])
{
int i;
unsigned long int n;
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-n")) {
n = strtoul(argv[++i], NULL, 10);
/* check for overflow */
if (errno)
return errno;
apds990x_dev.n = ((n > MAX_N) || (n <= 0)) ?
MAX_N : (unsigned int) n;
} else if (!strcmp(argv[i], "-h") ||
!strcmp(argv[i], "--help")) {
print_usage(argv[0]);
exit(EXIT_SUCCESS);
} else {
fprintf(stderr, "%s: %s\n\n",
argv[i], strerror(EINVAL));
print_usage(argv[0]);
return EINVAL;
}
}
return 0;
}
int main(int argc, char *argv[])
{
int err;
if (argc > 1) {
err = parse_cmdline(argc, argv);
if (err)
return err;
}
err = write_file(apds990x_dev.power, ENABLE);
if (err)
return err;
err = write_file(apds990x_dev.prox_en, ENABLE);
if (!err) {
read_proxy();
write_file(apds990x_dev.prox_en, DISABLE);
}
err = write_file(apds990x_dev.power, DISABLE);
return err;
}
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