/*
 * GPIO chardev test helper
 *
 * Copyright (C) 2016 Bamvor Jian Zhang
 *
 * 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.
 */

#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <libmount.h>
#include <err.h>
#include <dirent.h>
#include <linux/gpio.h>
#include "../../../gpio/gpio-utils.h"

#define CONSUMER	"gpio-selftest"
#define	GC_NUM		10
enum direction {
	OUT,
	IN
};

static int get_debugfs(char **path)
{
	struct libmnt_context *cxt;
	struct libmnt_table *tb;
	struct libmnt_iter *itr = NULL;
	struct libmnt_fs *fs;
	int found = 0;

	cxt = mnt_new_context();
	if (!cxt)
		err(EXIT_FAILURE, "libmount context allocation failed");

	itr = mnt_new_iter(MNT_ITER_FORWARD);
	if (!itr)
		err(EXIT_FAILURE, "failed to initialize libmount iterator");

	if (mnt_context_get_mtab(cxt, &tb))
		err(EXIT_FAILURE, "failed to read mtab");

	while (mnt_table_next_fs(tb, itr, &fs) == 0) {
		const char *type = mnt_fs_get_fstype(fs);

		if (!strcmp(type, "debugfs")) {
			found = 1;
			break;
		}
	}
	if (found)
		asprintf(path, "%s/gpio", mnt_fs_get_target(fs));

	mnt_free_iter(itr);
	mnt_free_context(cxt);

	if (!found)
		return -1;

	return 0;
}

static int gpio_debugfs_get(const char *consumer, int *dir, int *value)
{
	char *debugfs;
	FILE *f;
	char *line = NULL;
	size_t len = 0;
	char *cur;
	int found = 0;

	if (get_debugfs(&debugfs) != 0)
		err(EXIT_FAILURE, "debugfs is not mounted");

	f = fopen(debugfs, "r");
	if (!f)
		err(EXIT_FAILURE, "read from gpio debugfs failed");

	/*
	 * gpio-2   (                    |gpio-selftest               ) in  lo
	 */
	while (getline(&line, &len, f) != -1) {
		cur = strstr(line, consumer);
		if (cur == NULL)
			continue;

		cur = strchr(line, ')');
		if (!cur)
			continue;

		cur += 2;
		if (!strncmp(cur, "out", 3)) {
			*dir = OUT;
			cur += 4;
		} else if (!strncmp(cur, "in", 2)) {
			*dir = IN;
			cur += 4;
		}

		if (!strncmp(cur, "hi", 2))
			*value = 1;
		else if (!strncmp(cur, "lo", 2))
			*value = 0;

		found = 1;
		break;
	}
	free(debugfs);
	fclose(f);
	free(line);

	if (!found)
		return -1;

	return 0;
}

static struct gpiochip_info *list_gpiochip(const char *gpiochip_name, int *ret)
{
	struct gpiochip_info *cinfo;
	struct gpiochip_info *current;
	const struct dirent *ent;
	DIR *dp;
	char *chrdev_name;
	int fd;
	int i = 0;

	cinfo = calloc(sizeof(struct gpiochip_info) * 4, GC_NUM + 1);
	if (!cinfo)
		err(EXIT_FAILURE, "gpiochip_info allocation failed");

	current = cinfo;
	dp = opendir("/dev");
	if (!dp) {
		*ret = -errno;
		goto error_out;
	} else {
		*ret = 0;
	}

	while (ent = readdir(dp), ent) {
		if (check_prefix(ent->d_name, "gpiochip")) {
			*ret = asprintf(&chrdev_name, "/dev/%s", ent->d_name);
			if (*ret < 0)
				goto error_out;

			fd = open(chrdev_name, 0);
			if (fd == -1) {
				*ret = -errno;
				fprintf(stderr, "Failed to open %s\n",
					chrdev_name);
				goto error_close_dir;
			}
			*ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, current);
			if (*ret == -1) {
				perror("Failed to issue CHIPINFO IOCTL\n");
				goto error_close_dir;
			}
			close(fd);
			if (strcmp(current->label, gpiochip_name) == 0
			    || check_prefix(current->label, gpiochip_name)) {
				*ret = 0;
				current++;
				i++;
			}
		}
	}

	if ((!*ret && i == 0) || *ret < 0) {
		free(cinfo);
		cinfo = NULL;
	}
	if (!*ret && i > 0) {
		cinfo = realloc(cinfo, sizeof(struct gpiochip_info) * 4 * i);
		*ret = i;
	}

error_close_dir:
	closedir(dp);
error_out:
	if (*ret < 0)
		err(EXIT_FAILURE, "list gpiochip failed: %s", strerror(*ret));

	return cinfo;
}

int gpio_pin_test(struct gpiochip_info *cinfo, int line, int flag, int value)
{
	struct gpiohandle_data data;
	unsigned int lines[] = {line};
	int fd;
	int debugfs_dir = IN;
	int debugfs_value = 0;
	int ret;

	data.values[0] = value;
	ret = gpiotools_request_linehandle(cinfo->name, lines, 1, flag, &data,
					   CONSUMER);
	if (ret < 0)
		goto fail_out;
	else
		fd = ret;

	ret = gpio_debugfs_get(CONSUMER, &debugfs_dir, &debugfs_value);
	if (ret) {
		ret = -EINVAL;
		goto fail_out;
	}
	if (flag & GPIOHANDLE_REQUEST_INPUT) {
		if (debugfs_dir != IN) {
			errno = -EINVAL;
			ret = -errno;
		}
	} else if (flag & GPIOHANDLE_REQUEST_OUTPUT) {
		if (flag & GPIOHANDLE_REQUEST_ACTIVE_LOW)
			debugfs_value = !debugfs_value;

		if (!(debugfs_dir == OUT && value == debugfs_value))
			errno = -EINVAL;
		ret = -errno;

	}
	gpiotools_release_linehandle(fd);

fail_out:
	if (ret)
		err(EXIT_FAILURE, "gpio<%s> line<%d> test flag<0x%x> value<%d>",
		    cinfo->name, line, flag, value);

	return ret;
}

void gpio_pin_tests(struct gpiochip_info *cinfo, unsigned int line)
{
	printf("line<%d>", line);
	gpio_pin_test(cinfo, line, GPIOHANDLE_REQUEST_OUTPUT, 0);
	printf(".");
	gpio_pin_test(cinfo, line, GPIOHANDLE_REQUEST_OUTPUT, 1);
	printf(".");
	gpio_pin_test(cinfo, line,
		      GPIOHANDLE_REQUEST_OUTPUT | GPIOHANDLE_REQUEST_ACTIVE_LOW,
		      0);
	printf(".");
	gpio_pin_test(cinfo, line,
		      GPIOHANDLE_REQUEST_OUTPUT | GPIOHANDLE_REQUEST_ACTIVE_LOW,
		      1);
	printf(".");
	gpio_pin_test(cinfo, line, GPIOHANDLE_REQUEST_INPUT, 0);
	printf(".");
}

/*
 * ./gpio-mockup-chardev gpio_chip_name_prefix is_valid_gpio_chip
 * Return 0 if successful or exit with EXIT_FAILURE if test failed.
 * gpio_chip_name_prefix: The prefix of gpiochip you want to test. E.g.
 *			  gpio-mockup
 * is_valid_gpio_chip:	  Whether the gpio_chip is valid. 1 means valid,
 *			  0 means invalid which could not be found by
 *			  list_gpiochip.
 */
int main(int argc, char *argv[])
{
	char *prefix;
	int valid;
	struct gpiochip_info *cinfo;
	struct gpiochip_info *current;
	int i;
	int ret;

	if (argc < 3) {
		printf("Usage: %s prefix is_valid", argv[0]);
		exit(EXIT_FAILURE);
	}

	prefix = argv[1];
	valid = strcmp(argv[2], "true") == 0 ? 1 : 0;

	printf("Test gpiochip %s: ", prefix);
	cinfo = list_gpiochip(prefix, &ret);
	if (!cinfo) {
		if (!valid && ret == 0) {
			printf("Invalid test successful\n");
			ret = 0;
			goto out;
		} else {
			ret = -EINVAL;
			goto out;
		}
	} else if (cinfo && !valid) {
		ret = -EINVAL;
		goto out;
	}
	current = cinfo;
	for (i = 0; i < ret; i++) {
		gpio_pin_tests(current, 0);
		gpio_pin_tests(current, current->lines - 1);
		gpio_pin_tests(current, random() % current->lines);
		current++;
	}
	ret = 0;
	printf("successful\n");

out:
	if (ret)
		fprintf(stderr, "gpio<%s> test failed\n", prefix);

	if (cinfo)
		free(cinfo);

	if (ret)
		exit(EXIT_FAILURE);

	return ret;
}
we use
     the scalar nanoseconds storage unconditionally now. The 32bit
     timespec alike storage got removed due to the Y2038 limitations
     some time ago.

     That leaves the odd union access around for no reason. Clean it up.

  Both changes have been done with coccinelle and a small amount of
  manual mopping up"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ktime: Get rid of ktime_equal()
  ktime: Cleanup ktime_set() usage
  ktime: Get rid of the union
  clocksource: Use a plain u64 instead of cycle_t
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3ddc76dfc786cc6f87852693227fb0b1f124f807'>Diffstat</a> (limited to 'net/lapb/lapb_iface.c')</div><table summary='diffstat' class='diffstat'>