From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:02:30 +0200
Subject: Adding upstream version 4.19.249.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tools/gpio/gpio-hammer.c | 171 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 tools/gpio/gpio-hammer.c

(limited to 'tools/gpio/gpio-hammer.c')

diff --git a/tools/gpio/gpio-hammer.c b/tools/gpio/gpio-hammer.c
new file mode 100644
index 000000000..3da5462a0
--- /dev/null
+++ b/tools/gpio/gpio-hammer.c
@@ -0,0 +1,171 @@
+/*
+ * 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-hammer");
+	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':
+			/*
+			 * Avoid overflow. Do not immediately error, we want to
+			 * be able to accurately report on the amount of times
+			 * '-o' was given to give an accurate error message
+			 */
+			if (i < GPIOHANDLES_MAX)
+				lines[i] = strtoul(optarg, NULL, 10);
+
+			i++;
+			break;
+		case '?':
+			print_usage();
+			return -1;
+		}
+	}
+
+	if (i >= GPIOHANDLES_MAX) {
+		fprintf(stderr,
+			"Only %d occurences of '-o' are allowed, %d were found\n",
+			GPIOHANDLES_MAX, i + 1);
+		return -1;
+	}
+
+	nlines = i;
+
+	if (!device_name || !nlines) {
+		print_usage();
+		return -1;
+	}
+	return hammer_device(device_name, lines, nlines, loops);
+}
-- 
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