/*
 * gpio-event-mon - monitor GPIO line events from userspace
 *
 * Copyright (C) 2016 Linus Walleij
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * Usage:
 *	gpio-event-mon -n <device-name> -o <offset>
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <poll.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <sys/ioctl.h>
#include <linux/gpio.h>

int monitor_device(const char *device_name,
		   unsigned int line,
		   u_int32_t handleflags,
		   u_int32_t eventflags,
		   unsigned int loops)
{
	struct gpioevent_request req;
	struct gpiohandle_data data;
	char *chrdev_name;
	int fd;
	int ret;
	int i = 0;

	ret = asprintf(&chrdev_name, "/dev/%s", device_name);
	if (ret < 0)
		return -ENOMEM;

	fd = open(chrdev_name, 0);
	if (fd == -1) {
		ret = -errno;
		fprintf(stderr, "Failed to open %s\n", chrdev_name);
		goto exit_close_error;
	}

	req.lineoffset = line;
	req.handleflags = handleflags;
	req.eventflags = eventflags;
	strcpy(req.consumer_label, "gpio-event-mon");

	ret = ioctl(fd, GPIO_GET_LINEEVENT_IOCTL, &req);
	if (ret == -1) {
		ret = -errno;
		fprintf(stderr, "Failed to issue GET EVENT "
			"IOCTL (%d)\n",
			ret);
		goto exit_close_error;
	}

	/* Read initial states */
	ret = ioctl(req.fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &data);
	if (ret == -1) {
		ret = -errno;
		fprintf(stderr, "Failed to issue GPIOHANDLE GET LINE "
			"VALUES IOCTL (%d)\n",
			ret);
		goto exit_close_error;
	}

	fprintf(stdout, "Monitoring line %d on %s\n", line, device_name);
	fprintf(stdout, "Initial line value: %d\n", data.values[0]);

	while (1) {
		struct gpioevent_data event;

		ret = read(req.fd, &event, sizeof(event));
		if (ret == -1) {
			if (errno == -EAGAIN) {
				fprintf(stderr, "nothing available\n");
				continue;
			} else {
				ret = -errno;
				fprintf(stderr, "Failed to read event (%d)\n",
					ret);
				break;
			}
		}

		if (ret != sizeof(event)) {
			fprintf(stderr, "Reading event failed\n");
			ret = -EIO;
			break;
		}
		fprintf(stdout, "GPIO EVENT %" PRIu64 ": ", event.timestamp);
		switch (event.id) {
		case GPIOEVENT_EVENT_RISING_EDGE:
			fprintf(stdout, "rising edge");
			break;
		case GPIOEVENT_EVENT_FALLING_EDGE:
			fprintf(stdout, "falling edge");
			break;
		default:
			fprintf(stdout, "unknown event");
		}
		fprintf(stdout, "\n");

		i++;
		if (i == loops)
			break;
	}

exit_close_error:
	if (close(fd) == -1)
		perror("Failed to close GPIO character device file");
	free(chrdev_name);
	return ret;
}

void print_usage(void)
{
	fprintf(stderr, "Usage: gpio-event-mon [options]...\n"
		"Listen to events on GPIO lines, 0->1 1->0\n"
		"  -n <name>  Listen on GPIOs on a named device (must be stated)\n"
		"  -o <n>     Offset to monitor\n"
		"  -d         Set line as open drain\n"
		"  -s         Set line as open source\n"
		"  -r         Listen for rising edges\n"
		"  -f         Listen for falling edges\n"
		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"
		"  -?         This helptext\n"
		"\n"
		"Example:\n"
		"gpio-event-mon -n gpiochip0 -o 4 -r -f\n"
	);
}

int main(int argc, char **argv)
{
	const char *device_name = NULL;
	unsigned int line = -1;
	unsigned int loops = 0;
	u_int32_t handleflags = GPIOHANDLE_REQUEST_INPUT;
	u_int32_t eventflags = 0;
	int c;

	while ((c = getopt(argc, argv, "c:n:o:dsrf?")) != -1) {
		switch (c) {
		case 'c':
			loops = strtoul(optarg, NULL, 10);
			break;
		case 'n':
			device_name = optarg;
			break;
		case 'o':
			line = strtoul(optarg, NULL, 10);
			break;
		case 'd':
			handleflags |= GPIOHANDLE_REQUEST_OPEN_DRAIN;
			break;
		case 's':
			handleflags |= GPIOHANDLE_REQUEST_OPEN_SOURCE;
			break;
		case 'r':
			eventflags |= GPIOEVENT_REQUEST_RISING_EDGE;
			break;
		case 'f':
			eventflags |= GPIOEVENT_REQUEST_FALLING_EDGE;
			break;
		case '?':
			print_usage();
			return -1;
		}
	}

	if (!device_name || line == -1) {
		print_usage();
		return -1;
	}
	if (!eventflags) {
		printf("No flags specified, listening on both rising and "
		       "falling edges\n");
		eventflags = GPIOEVENT_REQUEST_BOTH_EDGES;
	}
	return monitor_device(device_name, line, handleflags,
			      eventflags, loops);
}
value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ruslan Ruslichenko &lt;rruslich@cisco.com&gt;</td><td class='right'>2017-01-17 16:13:52 +0200</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-18 15:37:28 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/netrom.h?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de'>020eb3daaba2857b32c4cf4c82f503d6a00a67de</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/netrom.h?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de'>329a05b424d783db675a4c711bd7633575e8181b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/netrom.h?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de'>include/net/netrom.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/netrom.h?id=49def1853334396f948dcb4cedb9347abb318df5'>49def1853334396f948dcb4cedb9347abb318df5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/netrom.h?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de&amp;id2=49def1853334396f948dcb4cedb9347abb318df5'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/ioapic: Restore IO-APIC irq_chip retrigger callback</div><div class='commit-msg'>commit d32932d02e18 removed the irq_retrigger callback from the IO-APIC
chip and did not add it to the new IO-APIC-IR irq chip.

Unfortunately the software resend fallback is not enabled on X86, so edge
interrupts which are received during the lazy disabled state of the
interrupt line are not retriggered and therefor lost.

Restore the callbacks.

[ tglx: Massaged changelog ]

Fixes: d32932d02e18  ("x86/irq: Convert IOAPIC to use hierarchical irqdomain interfaces")
Signed-off-by: Ruslan Ruslichenko &lt;rruslich@cisco.com&gt;
Cc: xe-linux-external@cisco.com
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1484662432-13580-1-git-send-email-rruslich@cisco.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=020eb3daaba2857b32c4cf4c82f503d6a00a67de'>Diffstat</a> (limited to 'include/net/netrom.h')</div><table summary='diffstat' class='diffstat'>