/*
 * gpio-hammer - example swiss army knife to shake GPIO lines on a system
 *
 * 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-hammer -n <device-name> -o <offset1> -o <offset2>
 */

#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 <sys/ioctl.h>
#include <linux/gpio.h>
#include "gpio-utils.h"

int hammer_device(const char *device_name, unsigned int *lines, int nlines,
		  unsigned int loops)
{
	struct gpiohandle_data data;
	char swirr[] = "-\\|/";
	int fd;
	int ret;
	int i, j;
	unsigned int iteration = 0;

	memset(&data.values, 0, sizeof(data.values));
	ret = gpiotools_request_linehandle(device_name, lines, nlines,
					   GPIOHANDLE_REQUEST_OUTPUT, &data,
					   "gpio-hammler");
	if (ret < 0)
		goto exit_error;
	else
		fd = ret;

	ret = gpiotools_get_values(fd, &data);
	if (ret < 0)
		goto exit_close_error;

	fprintf(stdout, "Hammer lines [");
	for (i = 0; i < nlines; i++) {
		fprintf(stdout, "%d", lines[i]);
		if (i != (nlines - 1))
			fprintf(stdout, ", ");
	}
	fprintf(stdout, "] on %s, initial states: [", device_name);
	for (i = 0; i < nlines; i++) {
		fprintf(stdout, "%d", data.values[i]);
		if (i != (nlines - 1))
			fprintf(stdout, ", ");
	}
	fprintf(stdout, "]\n");

	/* Hammertime! */
	j = 0;
	while (1) {
		/* Invert all lines so we blink */
		for (i = 0; i < nlines; i++)
			data.values[i] = !data.values[i];

		ret = gpiotools_set_values(fd, &data);
		if (ret < 0)
			goto exit_close_error;

		/* Re-read values to get status */
		ret = gpiotools_get_values(fd, &data);
		if (ret < 0)
			goto exit_close_error;

		fprintf(stdout, "[%c] ", swirr[j]);
		j++;
		if (j == sizeof(swirr)-1)
			j = 0;

		fprintf(stdout, "[");
		for (i = 0; i < nlines; i++) {
			fprintf(stdout, "%d: %d", lines[i], data.values[i]);
			if (i != (nlines - 1))
				fprintf(stdout, ", ");
		}
		fprintf(stdout, "]\r");
		fflush(stdout);
		sleep(1);
		iteration++;
		if (loops && iteration == loops)
			break;
	}
	fprintf(stdout, "\n");
	ret = 0;

exit_close_error:
	gpiotools_release_linehandle(fd);
exit_error:
	return ret;
}

void print_usage(void)
{
	fprintf(stderr, "Usage: gpio-hammer [options]...\n"
		"Hammer GPIO lines, 0->1->0->1...\n"
		"  -n <name>  Hammer GPIOs on a named device (must be stated)\n"
		"  -o <n>     Offset[s] to hammer, at least one, several can be stated\n"
		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"
		"  -?         This helptext\n"
		"\n"
		"Example:\n"
		"gpio-hammer -n gpiochip0 -o 4\n"
	);
}

int main(int argc, char **argv)
{
	const char *device_name = NULL;
	unsigned int lines[GPIOHANDLES_MAX];
	unsigned int loops = 0;
	int nlines;
	int c;
	int i;

	i = 0;
	while ((c = getopt(argc, argv, "c:n:o:?")) != -1) {
		switch (c) {
		case 'c':
			loops = strtoul(optarg, NULL, 10);
			break;
		case 'n':
			device_name = optarg;
			break;
		case 'o':
			lines[i] = strtoul(optarg, NULL, 10);
			i++;
			break;
		case '?':
			print_usage();
			return -1;
		}
	}
	nlines = i;

	if (!device_name || !nlines) {
		print_usage();
		return -1;
	}
	return hammer_device(device_name, lines, nlines, loops);
}
/option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 19:03:21 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 20:22:18 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/l3mdev/Makefile?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>aaaec6fc755447a1d056765b11b24d8ff2b81366</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/l3mdev/Makefile?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>a7f4167960ee1df86739905b6ccdeb95465bfe5f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/l3mdev/Makefile?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>net/l3mdev/Makefile</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/l3mdev/Makefile?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>08d85f3ea99f1eeafc4e8507936190e86a16ee8c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/l3mdev/Makefile?id=aaaec6fc755447a1d056765b11b24d8ff2b81366&amp;id2=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/irq: Make irq activate operations symmetric</div><div class='commit-msg'>The recent commit which prevents double activation of interrupts unearthed
interesting code in x86. The code (ab)uses irq_domain_activate_irq() to
reconfigure an already activated interrupt. That trips over the prevention
code now.

Fix it by deactivating the interrupt before activating the new configuration.

Fixes: 08d85f3ea99f1 "irqdomain: Avoid activating interrupts more than once"
Reported-and-tested-by: Mike Galbraith &lt;efault@gmx.de&gt;
Reported-and-tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Andrey Ryabinin &lt;aryabinin@virtuozzo.com&gt;
Cc: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701311901580.3457@nanos

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>Diffstat</a> (limited to 'net/l3mdev/Makefile')</div><table summary='diffstat' class='diffstat'>