tools/testing/selftests/ir/ir_loopback.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/ir/ir_loopback.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/ir/ir_loopback.c
Extension
.c
Size
5714 bytes
Lines
220
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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");
			}

Annotation

Implementation Notes