41 lines
929 B
C
41 lines
929 B
C
|
/*
|
||
|
|
* arch/sh64/kernel/led.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com>
|
||
|
|
*
|
||
|
|
* May be copied or modified under the terms of the GNU General Public
|
||
|
|
* License. See linux/COPYING for more information.
|
||
|
|
*
|
||
|
|
* Flash the LEDs
|
||
|
|
*/
|
||
|
|
#include <linux/stddef.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
|
||
|
|
void mach_led(int pos, int val);
|
||
|
|
|
||
|
|
/* acts like an actual heart beat -- ie thump-thump-pause... */
|
||
|
|
void heartbeat(void)
|
||
|
|
{
|
||
|
|
static unsigned int cnt = 0, period = 0, dist = 0;
|
||
|
|
|
||
|
|
if (cnt == 0 || cnt == dist) {
|
||
|
|
mach_led(-1, 1);
|
||
|
|
} else if (cnt == 7 || cnt == dist + 7) {
|
||
|
|
mach_led(-1, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (++cnt > period) {
|
||
|
|
cnt = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The hyperbolic function below modifies the heartbeat period
|
||
|
|
* length in dependency of the current (5min) load. It goes
|
||
|
|
* through the points f(0)=126, f(1)=86, f(5)=51, f(inf)->30.
|
||
|
|
*/
|
||
|
|
period = ((672 << FSHIFT) / (5 * avenrun[0] +
|
||
|
|
(7 << FSHIFT))) + 30;
|
||
|
|
dist = period / 4;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|