hp accelerometer: add freefall detection

This adds freefall handling to hp_accel driver.  According to HP, it
should just work, without us having to set the chip up by hand.

hpfall.c is example .c program that parks the disk when accelerometer
detects free fall.  It should work; for now, it uses fixed 20seconds
protection period.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Éric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/Documentation/hwmon/hpfall.c b/Documentation/hwmon/hpfall.c
new file mode 100644
index 000000000000..bbea1ccfd46a
--- /dev/null
+++ b/Documentation/hwmon/hpfall.c
@@ -0,0 +1,101 @@
+/* Disk protection for HP machines.
+ *
+ * Copyright 2008 Eric Piel
+ * Copyright 2009 Pavel Machek <pavel@suse.cz>
+ *
+ * GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <signal.h>
+
+void write_int(char *path, int i)
+{
+	char buf[1024];
+	int fd = open(path, O_RDWR);
+	if (fd < 0) {
+		perror("open");
+		exit(1);
+	}
+	sprintf(buf, "%d", i);
+	if (write(fd, buf, strlen(buf)) != strlen(buf)) {
+		perror("write");
+		exit(1);
+	}
+	close(fd);
+}
+
+void set_led(int on)
+{
+	write_int("/sys/class/leds/hp::hddprotect/brightness", on);
+}
+
+void protect(int seconds)
+{
+	write_int("/sys/block/sda/device/unload_heads", seconds*1000);
+}
+
+int on_ac(void)
+{
+//	/sys/class/power_supply/AC0/online
+}
+
+int lid_open(void)
+{
+//	/proc/acpi/button/lid/LID/state
+}
+
+void ignore_me(void)
+{
+	protect(0);
+	set_led(0);
+
+}
+
+int main(int argc, char* argv[])
+{
+       int fd, ret;
+
+       fd = open("/dev/freefall", O_RDONLY);
+       if (fd < 0) {
+               perror("open");
+               return EXIT_FAILURE;
+       }
+
+	signal(SIGALRM, ignore_me);
+
+       for (;;) {
+	       unsigned char count;
+
+               ret = read(fd, &count, sizeof(count));
+	       alarm(0);
+	       if ((ret == -1) && (errno == EINTR)) {
+		       /* Alarm expired, time to unpark the heads */
+		       continue;
+	       }
+
+               if (ret != sizeof(count)) {
+                       perror("read");
+                       break;
+               }
+
+	       protect(21);
+	       set_led(1);
+	       if (1 || on_ac() || lid_open()) {
+		       alarm(2);
+	       } else {
+		       alarm(20);
+	       }
+       }
+
+       close(fd);
+       return EXIT_SUCCESS;
+}