Release 4.7 tools/laptop/freefall/freefall.c

/* Disk protection for HP/DELL machines.
 *
 * Copyright 2008 Eric Piel
 * Copyright 2009 Pavel Machek <pavel@ucw.cz>
 * Copyright 2012 Sonal Santan
 * Copyright 2014 Pali Rohár <pali.rohar@gmail.com>
 *
 * GPLv2.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <signal.h>
#include <sys/mman.h>
#include <sched.h>
#include <syslog.h>


static int noled;

static char unload_heads_path[64];

static char device_path[32];

static const char app_name[] = "FREE FALL";



static int set_unload_heads_path(char *device)
{
	if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
		return -EINVAL;
	strncpy(device_path, device, sizeof(device_path) - 1);

	snprintf(unload_heads_path, sizeof(unload_heads_path) - 1,
				"/sys/block/%s/device/unload_heads", device+5);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
frans pop
frans pop
53
76.81%
1
25.00%
pali rohar
pali rohar
11
15.94%
1
25.00%
pavel machek
pavel machek
3
4.35%
1
25.00%
stefan weil
stefan weil
2
2.90%
1
25.00%
Total
69
100.00%
4
100.00%



static int valid_disk(void)
{
	int fd = open(unload_heads_path, O_RDONLY);

	if (fd < 0) {
		perror(unload_heads_path);
		return 0;
	}

	close(fd);
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
frans pop
frans pop
41
97.62%
1
50.00%
pali rohar
pali rohar
1
2.38%
1
50.00%
Total
42
100.00%
2
100.00%



static void write_int(char *path, int i)
{
	char buf[1024];
	int fd = open(path, O_RDWR);

	if (fd < 0) {
		perror("open");
		exit(1);
	}

	sprintf(buf, "%d", i);

	if (write(fd, buf, strlen(buf)) != strlen(buf)) {
		perror("write");
		exit(1);
	}

	close(fd);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
91
98.91%
1
50.00%
pali rohar
pali rohar
1
1.09%
1
50.00%
Total
92
100.00%
2
100.00%



static void set_led(int on)
{
	if (noled)
		return;
	write_int("/sys/class/leds/hp::hddprotect/brightness", on);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
15
71.43%
1
50.00%
pali rohar
pali rohar
6
28.57%
1
50.00%
Total
21
100.00%
2
100.00%



static void protect(int seconds)
{
	const char *str = (seconds == 0) ? "Unparked" : "Parked";

	write_int(unload_heads_path, seconds*1000);
	syslog(LOG_INFO, "%s %s disk head\n", str, device_path);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pali rohar
pali rohar
27
61.36%
1
33.33%
pavel machek
pavel machek
16
36.36%
1
33.33%
frans pop
frans pop
1
2.27%
1
33.33%
Total
44
100.00%
3
100.00%



static int on_ac(void)
{
	/* /sys/class/power_supply/AC0/online */
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
7
58.33%
1
50.00%
pali rohar
pali rohar
5
41.67%
1
50.00%
Total
12
100.00%
2
100.00%



static int lid_open(void)
{
	/* /proc/acpi/button/lid/LID/state */
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
7
58.33%
1
50.00%
pali rohar
pali rohar
5
41.67%
1
50.00%
Total
12
100.00%
2
100.00%



static void ignore_me(int signum)
{
	protect(0);
	set_led(0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
16
84.21%
1
50.00%
pali rohar
pali rohar
3
15.79%
1
50.00%
Total
19
100.00%
2
100.00%



int main(int argc, char **argv)
{
	int fd, ret;
	struct stat st;
	struct sched_param param;

	if (argc == 1)
		ret = set_unload_heads_path("/dev/sda");
	else if (argc == 2)
		ret = set_unload_heads_path(argv[1]);
	else
		ret = -EINVAL;

	if (ret || !valid_disk()) {
		fprintf(stderr, "usage: %s <device> (default: /dev/sda)\n",
				argv[0]);
		exit(1);
	}

	fd = open("/dev/freefall", O_RDONLY);
	if (fd < 0) {
		perror("/dev/freefall");
		return EXIT_FAILURE;
	}

	if (stat("/sys/class/leds/hp::hddprotect/brightness", &st))
		noled = 1;

	if (daemon(0, 0) != 0) {
		perror("daemon");
		return EXIT_FAILURE;
	}

	openlog(app_name, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);

	param.sched_priority = sched_get_priority_max(SCHED_FIFO);
	sched_setscheduler(0, SCHED_FIFO, &param);
	mlockall(MCL_CURRENT|MCL_FUTURE);

	signal(SIGALRM, ignore_me);

	for (;;) {
		unsigned char count;

		ret = read(fd, &count, sizeof(count));
		alarm(0);
		if ((ret == -1) && (errno == EINTR)) {
			/* Alarm expired, time to unpark the heads */
			continue;
		}

		if (ret != sizeof(count)) {
			perror("read");
			break;
		}

		protect(21);
		set_led(1);
		if (1 || on_ac() || lid_open())
			alarm(2);
		else
			alarm(20);
	}

	closelog();
	close(fd);
	return EXIT_SUCCESS;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
154
50.66%
1
25.00%
frans pop
frans pop
65
21.38%
1
25.00%
pali rohar
pali rohar
48
15.79%
1
25.00%
christian thaeter
christian thaeter
37
12.17%
1
25.00%
Total
304
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
pavel machek
pavel machek
339
49.78%
2
33.33%
frans pop
frans pop
166
24.38%
1
16.67%
pali rohar
pali rohar
131
19.24%
1
16.67%
christian thaeter
christian thaeter
43
6.31%
1
16.67%
stefan weil
stefan weil
2
0.29%
1
16.67%
Total
681
100.00%
6
100.00%
  
Directory: tools/laptop/freefall

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.