@@ -1,12 +1,13 @@
CC = $(CROSS_COMPILE)gcc
CFLAGS += -O2 -Wall -g -D_GNU_SOURCE
-all: lsgpio
+all: lsgpio gpio-hammer
lsgpio: lsgpio.o gpio-utils.o
+gpio-hammer: gpio-hammer.o gpio-utils.o
%.o: %.c gpio-utils.h
.PHONY: clean
clean:
- rm -f *.o lsgpio
+ rm -f *.o lsgpio gpio-hammer
new file mode 100644
@@ -0,0 +1,189 @@
+/*
+ * 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>
+
+int hammer_device(const char *device_name, unsigned int *lines, int nlines,
+ unsigned int loops)
+{
+ struct gpiohandle_request req;
+ struct gpiohandle_data data;
+ char *chrdev_name;
+ char swirr[] = "-\\|/";
+ int fd;
+ int ret;
+ int i, j;
+ unsigned int iteration = 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;
+ }
+
+ /* Request lines as output */
+ for (i = 0; i < nlines; i++)
+ req.lineoffsets[i] = lines[i];
+ req.flags = GPIOHANDLE_REQUEST_OUTPUT; /* Request as output */
+ strcpy(req.consumer_label, "gpio-hammer");
+ req.lines = nlines;
+ ret = ioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
+ if (ret == -1) {
+ ret = -errno;
+ fprintf(stderr, "Failed to issue GET LINEHANDLE "
+ "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, "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 = ioctl(req.fd, GPIOHANDLE_SET_LINE_VALUES_IOCTL, &data);
+ if (ret == -1) {
+ ret = -errno;
+ fprintf(stderr, "Failed to issue GPIOHANDLE SET LINE "
+ "VALUES IOCTL (%d)\n",
+ ret);
+ goto exit_close_error;
+ }
+ /* Re-read values to get status */
+ 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, "[%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:
+ 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-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);
+}