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Commit be3990b7 authored by Frans Pop's avatar Frans Pop Committed by Jiri Kosina
Browse files

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: default avatarFrans Pop <elendil@planet.nl>
Cc: Christian Thaeter <ct@pipapo.org>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 2bace8b9

Documentation/hwmon/hpfall.c

+42 −3
Original line number Diff line number Diff line
@@ -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;

	}