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| author | Frans Pop <elendil@planet.nl> | 2009-07-25 21:00:12 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2009-09-21 15:14:57 +0200 |
| commit | be3990b7efbe8784fe063fb6871a772c0703891a (patch) | |
| tree | b11207c6eb29a3c9bc381ed16a42c83f8b2713d2 /Documentation | |
| parent | 2bace8b95108746f6123d312f47f5bda4eb17a26 (diff) | |
| download | linux-3.10-be3990b7efbe8784fe063fb6871a772c0703891a.tar.gz linux-3.10-be3990b7efbe8784fe063fb6871a772c0703891a.tar.bz2 linux-3.10-be3990b7efbe8784fe063fb6871a772c0703891a.zip | |
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 a3cfe1a5f96..681ec22b9d0 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; } |