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![Dipen Patel](/assets/img/avatar_default.png)
gpiolib-cdev is extended to support hardware clock type, this patch reflects that fact. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
240 lines
5.8 KiB
C
240 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* gpio-event-mon - monitor GPIO line events from userspace
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*
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* Copyright (C) 2016 Linus Walleij
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*
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* Usage:
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* gpio-event-mon -n <device-name> -o <offset>
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <poll.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <inttypes.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <linux/gpio.h>
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#include "gpio-utils.h"
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int monitor_device(const char *device_name,
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unsigned int *lines,
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unsigned int num_lines,
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struct gpio_v2_line_config *config,
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unsigned int loops)
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{
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struct gpio_v2_line_values values;
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char *chrdev_name;
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int cfd, lfd;
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int ret;
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int i = 0;
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ret = asprintf(&chrdev_name, "/dev/%s", device_name);
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if (ret < 0)
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return -ENOMEM;
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cfd = open(chrdev_name, 0);
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if (cfd == -1) {
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ret = -errno;
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fprintf(stderr, "Failed to open %s\n", chrdev_name);
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goto exit_free_name;
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}
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ret = gpiotools_request_line(device_name, lines, num_lines, config,
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"gpio-event-mon");
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if (ret < 0)
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goto exit_device_close;
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else
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lfd = ret;
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/* Read initial states */
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values.mask = 0;
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values.bits = 0;
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for (i = 0; i < num_lines; i++)
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gpiotools_set_bit(&values.mask, i);
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ret = gpiotools_get_values(lfd, &values);
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if (ret < 0) {
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fprintf(stderr,
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"Failed to issue GPIO LINE GET VALUES IOCTL (%d)\n",
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ret);
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goto exit_line_close;
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}
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if (num_lines == 1) {
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fprintf(stdout, "Monitoring line %d on %s\n", lines[0], device_name);
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fprintf(stdout, "Initial line value: %d\n",
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gpiotools_test_bit(values.bits, 0));
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} else {
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fprintf(stdout, "Monitoring lines %d", lines[0]);
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for (i = 1; i < num_lines - 1; i++)
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fprintf(stdout, ", %d", lines[i]);
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fprintf(stdout, " and %d on %s\n", lines[i], device_name);
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fprintf(stdout, "Initial line values: %d",
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gpiotools_test_bit(values.bits, 0));
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for (i = 1; i < num_lines - 1; i++)
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fprintf(stdout, ", %d",
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gpiotools_test_bit(values.bits, i));
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fprintf(stdout, " and %d\n",
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gpiotools_test_bit(values.bits, i));
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}
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while (1) {
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struct gpio_v2_line_event event;
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ret = read(lfd, &event, sizeof(event));
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if (ret == -1) {
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if (errno == -EAGAIN) {
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fprintf(stderr, "nothing available\n");
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continue;
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} else {
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ret = -errno;
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fprintf(stderr, "Failed to read event (%d)\n",
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ret);
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break;
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}
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}
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if (ret != sizeof(event)) {
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fprintf(stderr, "Reading event failed\n");
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ret = -EIO;
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break;
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}
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fprintf(stdout, "GPIO EVENT at %" PRIu64 " on line %d (%d|%d) ",
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(uint64_t)event.timestamp_ns, event.offset, event.line_seqno,
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event.seqno);
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switch (event.id) {
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case GPIO_V2_LINE_EVENT_RISING_EDGE:
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fprintf(stdout, "rising edge");
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break;
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case GPIO_V2_LINE_EVENT_FALLING_EDGE:
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fprintf(stdout, "falling edge");
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break;
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default:
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fprintf(stdout, "unknown event");
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}
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fprintf(stdout, "\n");
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i++;
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if (i == loops)
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break;
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}
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exit_line_close:
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if (close(lfd) == -1)
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perror("Failed to close line file");
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exit_device_close:
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if (close(cfd) == -1)
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perror("Failed to close GPIO character device file");
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exit_free_name:
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free(chrdev_name);
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return ret;
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}
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void print_usage(void)
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{
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fprintf(stderr, "Usage: gpio-event-mon [options]...\n"
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"Listen to events on GPIO lines, 0->1 1->0\n"
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" -n <name> Listen on GPIOs on a named device (must be stated)\n"
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" -o <n> Offset of line to monitor (may be repeated)\n"
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" -d Set line as open drain\n"
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" -s Set line as open source\n"
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" -r Listen for rising edges\n"
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" -f Listen for falling edges\n"
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" -w Report the wall-clock time for events\n"
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" -t Report the hardware timestamp for events\n"
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" -b <n> Debounce the line with period n microseconds\n"
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" [-c <n>] Do <n> loops (optional, infinite loop if not stated)\n"
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" -? This helptext\n"
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"\n"
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"Example:\n"
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"gpio-event-mon -n gpiochip0 -o 4 -r -f -b 10000\n"
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);
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}
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#define EDGE_FLAGS \
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(GPIO_V2_LINE_FLAG_EDGE_RISING | \
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GPIO_V2_LINE_FLAG_EDGE_FALLING)
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int main(int argc, char **argv)
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{
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const char *device_name = NULL;
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unsigned int lines[GPIO_V2_LINES_MAX];
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unsigned int num_lines = 0;
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unsigned int loops = 0;
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struct gpio_v2_line_config config;
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int c, attr, i;
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unsigned long debounce_period_us = 0;
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memset(&config, 0, sizeof(config));
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config.flags = GPIO_V2_LINE_FLAG_INPUT;
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while ((c = getopt(argc, argv, "c:n:o:b:dsrfwt?")) != -1) {
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switch (c) {
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case 'c':
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loops = strtoul(optarg, NULL, 10);
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break;
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case 'n':
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device_name = optarg;
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break;
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case 'o':
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if (num_lines >= GPIO_V2_LINES_MAX) {
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print_usage();
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return -1;
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}
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lines[num_lines] = strtoul(optarg, NULL, 10);
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num_lines++;
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break;
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case 'b':
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debounce_period_us = strtoul(optarg, NULL, 10);
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break;
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case 'd':
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config.flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN;
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break;
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case 's':
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config.flags |= GPIO_V2_LINE_FLAG_OPEN_SOURCE;
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break;
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case 'r':
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config.flags |= GPIO_V2_LINE_FLAG_EDGE_RISING;
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break;
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case 'f':
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config.flags |= GPIO_V2_LINE_FLAG_EDGE_FALLING;
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break;
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case 'w':
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config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME;
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break;
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case 't':
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config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE;
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break;
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case '?':
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print_usage();
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return -1;
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}
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}
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if (debounce_period_us) {
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attr = config.num_attrs;
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config.num_attrs++;
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for (i = 0; i < num_lines; i++)
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gpiotools_set_bit(&config.attrs[attr].mask, i);
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config.attrs[attr].attr.id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
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config.attrs[attr].attr.debounce_period_us = debounce_period_us;
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}
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if (!device_name || num_lines == 0) {
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print_usage();
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return -1;
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}
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if (!(config.flags & EDGE_FLAGS)) {
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printf("No flags specified, listening on both rising and "
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"falling edges\n");
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config.flags |= EDGE_FLAGS;
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}
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return monitor_device(device_name, lines, num_lines, &config, loops);
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}
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