diff options
author | Frans Pop <elendil@planet.nl> | 2009-07-25 21:00:12 +0200 |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2009-08-08 03:02:40 +0200 |
commit | 50fde1903fc64c96b1dfba62456debc4d13b80d9 (patch) | |
tree | 6d6a4d8cffb0dbd067354b32d3eed204f05bcfa4 /Documentation | |
parent | 96cdd69208f39d2052170992b2f1a8c617507c8f (diff) |
trivial: doc: hpfall: accept disk device to unload as argument
Allows users who use an IDE driver for their disk to use hpfall without
having to modify the source. By default /dev/sda is used.
Suggested by Christian Thaeter in http://lkml.org/lkml/2009/3/25/505.
While we're add it, improve error message if opening /dev/freefall fails.
Signed-off-by: Frans Pop <elendil@planet.nl>
Cc: Christian Thaeter <ct@pipapo.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/hwmon/hpfall.c | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/Documentation/hwmon/hpfall.c b/Documentation/hwmon/hpfall.c index a3cfe1a5f964..681ec22b9d0e 100644 --- a/Documentation/hwmon/hpfall.c +++ b/Documentation/hwmon/hpfall.c @@ -19,6 +19,32 @@ #include <sys/mman.h> #include <sched.h> +char unload_heads_path[64]; + +int set_unload_heads_path(char *device) +{ + char devname[64]; + + if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0) + return -EINVAL; + strncpy(devname, device + 5, sizeof(devname)); + + snprintf(unload_heads_path, sizeof(unload_heads_path), + "/sys/block/%s/device/unload_heads", devname); + return 0; +} +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; +} + void write_int(char *path, int i) { char buf[1024]; @@ -42,7 +68,7 @@ void set_led(int on) void protect(int seconds) { - write_int("/sys/block/sda/device/unload_heads", seconds*1000); + write_int(unload_heads_path, seconds*1000); } int on_ac(void) @@ -61,14 +87,27 @@ void ignore_me(void) set_led(0); } -int main(int argc, char *argv[]) +int main(int argc, char **argv) { int fd, ret; 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("open"); + perror("/dev/freefall"); return EXIT_FAILURE; } |