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// SPDX-License-Identifier: GPL-2.0
/*
* GPIO mockup cdev test helper
*
* Copyright (C) 2020 Kent Gibson
*/
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/gpio.h>
#define CONSUMER "gpio-mockup-cdev"
static int request_line_v1(int cfd, unsigned int offset,
uint32_t flags, unsigned int val)
{
struct gpiohandle_request req;
int ret;
memset(&req, 0, sizeof(req));
req.lines = 1;
req.lineoffsets[0] = offset;
req.flags = flags;
strcpy(req.consumer_label, CONSUMER);
if (flags & GPIOHANDLE_REQUEST_OUTPUT)
req.default_values[0] = val;
ret = ioctl(cfd, GPIO_GET_LINEHANDLE_IOCTL, &req);
if (ret == -1)
return -errno;
return req.fd;
}
static int get_value_v1(int lfd)
{
struct gpiohandle_data vals;
int ret;
memset(&vals, 0, sizeof(vals));
ret = ioctl(lfd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &vals);
if (ret == -1)
return -errno;
return vals.values[0];
}
static void usage(char *prog)
{
printf("Usage: %s [-l] [-b <bias>] [-s <value>] [-u <uAPI>] <gpiochip> <offset>\n", prog);
printf(" -b: set line bias to one of pull-down, pull-up, disabled\n");
printf(" (default is to leave bias unchanged):\n");
printf(" -l: set line active low (default is active high)\n");
printf(" -s: set line value (default is to get line value)\n");
exit(-1);
}
static int wait_signal(void)
{
int sig;
sigset_t wset;
sigemptyset(&wset);
sigaddset(&wset, SIGHUP);
sigaddset(&wset, SIGINT);
sigaddset(&wset, SIGTERM);
sigwait(&wset, &sig);
return sig;
}
int main(int argc, char *argv[])
{
char *chip;
int opt, ret, cfd, lfd;
unsigned int offset, val;
uint32_t flags_v1;
ret = 0;
flags_v1 = GPIOHANDLE_REQUEST_INPUT;
while ((opt = getopt(argc, argv, "lb:s:u:")) != -1) {
switch (opt) {
case 'l':
flags_v1 |= GPIOHANDLE_REQUEST_ACTIVE_LOW;
break;
case 'b':
if (strcmp("pull-up", optarg) == 0)
flags_v1 |= GPIOHANDLE_REQUEST_BIAS_PULL_UP;
else if (strcmp("pull-down", optarg) == 0)
flags_v1 |= GPIOHANDLE_REQUEST_BIAS_PULL_DOWN;
else if (strcmp("disabled", optarg) == 0)
flags_v1 |= GPIOHANDLE_REQUEST_BIAS_DISABLE;
break;
case 's':
val = atoi(optarg);
flags_v1 &= ~GPIOHANDLE_REQUEST_INPUT;
flags_v1 |= GPIOHANDLE_REQUEST_OUTPUT;
break;
default:
usage(argv[0]);
}
}
if (argc < optind + 2)
usage(argv[0]);
chip = argv[optind];
offset = atoi(argv[optind + 1]);
cfd = open(chip, 0);
if (cfd == -1) {
fprintf(stderr, "Failed to open %s: %s\n", chip, strerror(errno));
return -errno;
}
lfd = request_line_v1(cfd, offset, flags_v1, val);
close(cfd);
if (lfd < 0) {
fprintf(stderr, "Failed to request %s:%d: %s\n", chip, offset, strerror(-lfd));
return lfd;
}
if (flags_v1 & GPIOHANDLE_REQUEST_OUTPUT)
wait_signal();
else
ret = get_value_v1(lfd);
close(lfd);
return ret;
}
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