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// SPDX-License-Identifier: GPL-2.0
// test ir decoder
//
// Copyright (C) 2018 Sean Young <sean@mess.org>
// When sending LIRC_MODE_SCANCODE, the IR will be encoded. rc-loopback
// will send this IR to the receiver side, where we try to read the decoded
// IR. Decoding happens in a separate kernel thread, so we will need to
// wait until that is scheduled, hence we use poll to check for read
// readiness.
#include <linux/lirc.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <poll.h>
#include <time.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "../kselftest.h"
#define TEST_SCANCODES 10
#define SYSFS_PATH_MAX 256
#define DNAME_PATH_MAX 256
/*
* Support ancient lirc.h which does not have these values. Can be removed
* once RHEL 8 is no longer a relevant testing platform.
*/
#if RC_PROTO_MAX < 26
#define RC_PROTO_RCMM12 24
#define RC_PROTO_RCMM24 25
#define RC_PROTO_RCMM32 26
#endif
static const struct {
enum rc_proto proto;
const char *name;
unsigned int mask;
const char *decoder;
} protocols[] = {
{ RC_PROTO_RC5, "rc-5", 0x1f7f, "rc-5" },
{ RC_PROTO_RC5X_20, "rc-5x-20", 0x1f7f3f, "rc-5" },
{ RC_PROTO_RC5_SZ, "rc-5-sz", 0x2fff, "rc-5-sz" },
{ RC_PROTO_JVC, "jvc", 0xffff, "jvc" },
{ RC_PROTO_SONY12, "sony-12", 0x1f007f, "sony" },
{ RC_PROTO_SONY15, "sony-15", 0xff007f, "sony" },
{ RC_PROTO_SONY20, "sony-20", 0x1fff7f, "sony" },
{ RC_PROTO_NEC, "nec", 0xffff, "nec" },
{ RC_PROTO_NECX, "nec-x", 0xffffff, "nec" },
{ RC_PROTO_NEC32, "nec-32", 0xffffffff, "nec" },
{ RC_PROTO_SANYO, "sanyo", 0x1fffff, "sanyo" },
{ RC_PROTO_RC6_0, "rc-6-0", 0xffff, "rc-6" },
{ RC_PROTO_RC6_6A_20, "rc-6-6a-20", 0xfffff, "rc-6" },
{ RC_PROTO_RC6_6A_24, "rc-6-6a-24", 0xffffff, "rc-6" },
{ RC_PROTO_RC6_6A_32, "rc-6-6a-32", 0xffffffff, "rc-6" },
{ RC_PROTO_RC6_MCE, "rc-6-mce", 0x00007fff, "rc-6" },
{ RC_PROTO_SHARP, "sharp", 0x1fff, "sharp" },
{ RC_PROTO_IMON, "imon", 0x7fffffff, "imon" },
{ RC_PROTO_RCMM12, "rcmm-12", 0x00000fff, "rc-mm" },
{ RC_PROTO_RCMM24, "rcmm-24", 0x00ffffff, "rc-mm" },
{ RC_PROTO_RCMM32, "rcmm-32", 0xffffffff, "rc-mm" },
};
int lirc_open(const char *rc)
{
struct dirent *dent;
char buf[SYSFS_PATH_MAX + DNAME_PATH_MAX];
DIR *d;
int fd;
snprintf(buf, sizeof(buf), "/sys/class/rc/%s", rc);
d = opendir(buf);
if (!d)
ksft_exit_fail_msg("cannot open %s: %m\n", buf);
while ((dent = readdir(d)) != NULL) {
if (!strncmp(dent->d_name, "lirc", 4)) {
snprintf(buf, sizeof(buf), "/dev/%s", dent->d_name);
break;
}
}
if (!dent)
ksft_exit_skip("cannot find lirc device for %s\n", rc);
closedir(d);
fd = open(buf, O_RDWR | O_NONBLOCK);
if (fd == -1)
ksft_exit_fail_msg("cannot open: %s: %m\n", buf);
return fd;
}
int main(int argc, char **argv)
{
unsigned int mode;
char buf[100];
int rlircfd, wlircfd, protocolfd, i, n;
srand(time(NULL));
if (argc != 3)
ksft_exit_fail_msg("Usage: %s <write rcN> <read rcN>\n",
argv[0]);
rlircfd = lirc_open(argv[2]);
mode = LIRC_MODE_SCANCODE;
if (ioctl(rlircfd, LIRC_SET_REC_MODE, &mode))
ksft_exit_fail_msg("failed to set scancode rec mode %s: %m\n",
argv[2]);
wlircfd = lirc_open(argv[1]);
if (ioctl(wlircfd, LIRC_SET_SEND_MODE, &mode))
ksft_exit_fail_msg("failed to set scancode send mode %s: %m\n",
argv[1]);
snprintf(buf, sizeof(buf), "/sys/class/rc/%s/protocols", argv[2]);
protocolfd = open(buf, O_WRONLY);
if (protocolfd == -1)
ksft_exit_fail_msg("failed to open %s: %m\n", buf);
printf("Sending IR on %s and receiving IR on %s.\n", argv[1], argv[2]);
for (i = 0; i < ARRAY_SIZE(protocols); i++) {
if (write(protocolfd, protocols[i].decoder,
strlen(protocols[i].decoder)) == -1)
ksft_exit_fail_msg("failed to set write decoder\n");
printf("Testing protocol %s for decoder %s (%d/%d)...\n",
protocols[i].name, protocols[i].decoder,
i + 1, (int)ARRAY_SIZE(protocols));
for (n = 0; n < TEST_SCANCODES; n++) {
unsigned int scancode = rand() & protocols[i].mask;
unsigned int rc_proto = protocols[i].proto;
if (rc_proto == RC_PROTO_RC6_MCE)
scancode |= 0x800f0000;
if (rc_proto == RC_PROTO_NECX &&
(((scancode >> 16) ^ ~(scancode >> 8)) & 0xff) == 0)
continue;
if (rc_proto == RC_PROTO_NEC32 &&
(((scancode >> 8) ^ ~scancode) & 0xff) == 0)
continue;
if (rc_proto == RC_PROTO_RCMM32 &&
(scancode & 0x000c0000) != 0x000c0000 &&
scancode & 0x00008000)
continue;
struct lirc_scancode lsc = {
.rc_proto = rc_proto,
.scancode = scancode
};
printf("Testing scancode:%x\n", scancode);
while (write(wlircfd, &lsc, sizeof(lsc)) < 0) {
if (errno == EINTR)
continue;
ksft_exit_fail_msg("failed to send ir: %m\n");
}
struct pollfd pfd = { .fd = rlircfd, .events = POLLIN };
struct lirc_scancode lsc2;
poll(&pfd, 1, 1000);
bool decoded = true;
while (read(rlircfd, &lsc2, sizeof(lsc2)) < 0) {
if (errno == EINTR)
continue;
ksft_test_result_error("no scancode decoded: %m\n");
decoded = false;
break;
}
if (!decoded)
continue;
if (lsc.rc_proto != lsc2.rc_proto)
ksft_test_result_error("decoded protocol is different: %d\n",
lsc2.rc_proto);
else if (lsc.scancode != lsc2.scancode)
ksft_test_result_error("decoded scancode is different: %llx\n",
lsc2.scancode);
else
ksft_inc_pass_cnt();
}
printf("OK\n");
}
close(rlircfd);
close(wlircfd);
close(protocolfd);
if (ksft_get_fail_cnt() > 0)
ksft_exit_fail();
else
ksft_exit_pass();
return 0;
}
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