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236 lines
5.7 KiB
236 lines
5.7 KiB
// 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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" -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:dsrfw?")) != -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 '?': |
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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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