/*
 * 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;
}
iv class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'>Pull networking fixes from David Miller:

 1) GTP fixes from Andreas Schultz (missing genl module alias, clear IP
    DF on transmit).

 2) Netfilter needs to reflect the fwmark when sending resets, from Pau
    Espin Pedrol.

 3) nftable dump OOPS fix from Liping Zhang.

 4) Fix erroneous setting of VIRTIO_NET_HDR_F_DATA_VALID on transmit,
    from Rolf Neugebauer.

 5) Fix build error of ipt_CLUSTERIP when procfs is disabled, from Arnd
    Bergmann.

 6) Fix regression in handling of NETIF_F_SG in harmonize_features(),
    from Eric Dumazet.

 7) Fix RTNL deadlock wrt. lwtunnel module loading, from David Ahern.

 8) tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'sound/oss/sleep.h')</div><table summary='diffstat' class='diffstat'>