ndhc/rfkill.c

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// Copyright 2015-2018 Nicholas J. Kain <njkain at gmail dot com>
// SPDX-License-Identifier: MIT
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/rfkill.h>
#include "nk/log.h"
#include "nk/io.h"
#include "ndhc.h"
#include "rfkill.h"
int rfkill_open(bool *enable_rfkill)
{
if (!*enable_rfkill)
return -1;
int r = open("/dev/rfkill", O_RDONLY|O_CLOEXEC|O_NONBLOCK);
if (r < 0) {
*enable_rfkill = false;
log_line("rfkill disabled: could not open /dev/rfkill: %s",
strerror(errno));
}
return r;
}
// check_idx: Does rfkidx have any meaning?
// rfkidx: Pay attention only to this radio kill switch number.
int rfkill_get(struct client_state_t *cs, int check_idx, uint32_t rfkidx)
{
struct rfkill_event event;
ssize_t len = safe_read(cs->rfkillFd, (char *)&event, sizeof event);
if (len < 0) {
log_line("rfkill: safe_read failed: %s", strerror(errno));
return RFK_FAIL;
}
if (len != RFKILL_EVENT_SIZE_V1) {
log_line("rfkill: event has unexpected size: %zd", len);
return RFK_FAIL;
}
log_line("rfkill: idx[%u] type[%u] op[%u] soft[%u] hard[%u]",
event.idx, event.type, event.op, event.soft, event.hard);
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if (check_idx && event.idx != rfkidx)
return RFK_NONE;
if (event.op != RFKILL_OP_CHANGE && event.op != RFKILL_OP_CHANGE_ALL)
return RFK_NONE;
if (event.soft || event.hard) {
return RFK_ENABLED;
} else {
return RFK_DISABLED;
}
}