1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Disk protection for HP/DELL machines.
4 * Copyright 2008 Eric Piel
5 * Copyright 2009 Pavel Machek <pavel@ucw.cz>
6 * Copyright 2012 Sonal Santan
7 * Copyright 2014 Pali Rohár <pali.rohar@gmail.com>
15 #include <sys/types.h>
25 static char unload_heads_path[64];
26 static char device_path[32];
27 static const char app_name[] = "FREE FALL";
29 static int set_unload_heads_path(char *device)
31 if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
33 strncpy(device_path, device, sizeof(device_path) - 1);
35 snprintf(unload_heads_path, sizeof(unload_heads_path) - 1,
36 "/sys/block/%s/device/unload_heads", device+5);
40 static int valid_disk(void)
42 int fd = open(unload_heads_path, O_RDONLY);
45 perror(unload_heads_path);
53 static void write_int(char *path, int i)
56 int fd = open(path, O_RDWR);
63 sprintf(buf, "%d", i);
65 if (write(fd, buf, strlen(buf)) != strlen(buf)) {
73 static void set_led(int on)
77 write_int("/sys/class/leds/hp::hddprotect/brightness", on);
80 static void protect(int seconds)
82 const char *str = (seconds == 0) ? "Unparked" : "Parked";
84 write_int(unload_heads_path, seconds*1000);
85 syslog(LOG_INFO, "%s %s disk head\n", str, device_path);
88 static int on_ac(void)
90 /* /sys/class/power_supply/AC0/online */
94 static int lid_open(void)
96 /* /proc/acpi/button/lid/LID/state */
100 static void ignore_me(int signum)
106 int main(int argc, char **argv)
110 struct sched_param param;
113 ret = set_unload_heads_path("/dev/sda");
115 ret = set_unload_heads_path(argv[1]);
119 if (ret || !valid_disk()) {
120 fprintf(stderr, "usage: %s <device> (default: /dev/sda)\n",
125 fd = open("/dev/freefall", O_RDONLY);
127 perror("/dev/freefall");
131 if (stat("/sys/class/leds/hp::hddprotect/brightness", &st))
134 if (daemon(0, 0) != 0) {
139 openlog(app_name, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
141 param.sched_priority = sched_get_priority_max(SCHED_FIFO);
142 sched_setscheduler(0, SCHED_FIFO, ¶m);
143 mlockall(MCL_CURRENT|MCL_FUTURE);
145 signal(SIGALRM, ignore_me);
150 ret = read(fd, &count, sizeof(count));
152 if ((ret == -1) && (errno == EINTR)) {
153 /* Alarm expired, time to unpark the heads */
157 if (ret != sizeof(count)) {
164 if (1 || on_ac() || lid_open())