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>

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;
         }