1 /* Disk protection for HP machines.
2 *
3 * Copyright 2008 Eric Piel
4 * Copyright 2009 Pavel Machek <pavel@suse.cz>
5 *
6 * GPLv2.
7 */
8
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12 #include <fcntl.h>
13 #include <sys/stat.h>
14 #include <sys/types.h>
15 #include <string.h>
16 #include <stdint.h>
17 #include <errno.h>
18 #include <signal.h>
19
write_int(char * path,int i)20 void write_int(char *path, int i)
21 {
22 char buf[1024];
23 int fd = open(path, O_RDWR);
24 if (fd < 0) {
25 perror("open");
26 exit(1);
27 }
28 sprintf(buf, "%d", i);
29 if (write(fd, buf, strlen(buf)) != strlen(buf)) {
30 perror("write");
31 exit(1);
32 }
33 close(fd);
34 }
35
set_led(int on)36 void set_led(int on)
37 {
38 write_int("/sys/class/leds/hp::hddprotect/brightness", on);
39 }
40
protect(int seconds)41 void protect(int seconds)
42 {
43 write_int("/sys/block/sda/device/unload_heads", seconds*1000);
44 }
45
on_ac(void)46 int on_ac(void)
47 {
48 // /sys/class/power_supply/AC0/online
49 }
50
lid_open(void)51 int lid_open(void)
52 {
53 // /proc/acpi/button/lid/LID/state
54 }
55
ignore_me(void)56 void ignore_me(void)
57 {
58 protect(0);
59 set_led(0);
60
61 }
62
main(int argc,char * argv[])63 int main(int argc, char* argv[])
64 {
65 int fd, ret;
66
67 fd = open("/dev/freefall", O_RDONLY);
68 if (fd < 0) {
69 perror("open");
70 return EXIT_FAILURE;
71 }
72
73 signal(SIGALRM, ignore_me);
74
75 for (;;) {
76 unsigned char count;
77
78 ret = read(fd, &count, sizeof(count));
79 alarm(0);
80 if ((ret == -1) && (errno == EINTR)) {
81 /* Alarm expired, time to unpark the heads */
82 continue;
83 }
84
85 if (ret != sizeof(count)) {
86 perror("read");
87 break;
88 }
89
90 protect(21);
91 set_led(1);
92 if (1 || on_ac() || lid_open()) {
93 alarm(2);
94 } else {
95 alarm(20);
96 }
97 }
98
99 close(fd);
100 return EXIT_SUCCESS;
101 }
102