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1da177e4 LT |
1 | /* |
2 | * arch/sh64/kernel/led.c | |
3 | * | |
4 | * Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com> | |
5 | * | |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
9 | * Flash the LEDs | |
10 | */ | |
11 | #include <linux/config.h> | |
12 | #include <linux/stddef.h> | |
13 | #include <linux/sched.h> | |
14 | ||
15 | void mach_led(int pos, int val); | |
16 | ||
17 | /* acts like an actual heart beat -- ie thump-thump-pause... */ | |
18 | void heartbeat(void) | |
19 | { | |
20 | static unsigned int cnt = 0, period = 0, dist = 0; | |
21 | ||
22 | if (cnt == 0 || cnt == dist) { | |
23 | mach_led(-1, 1); | |
24 | } else if (cnt == 7 || cnt == dist + 7) { | |
25 | mach_led(-1, 0); | |
26 | } | |
27 | ||
28 | if (++cnt > period) { | |
29 | cnt = 0; | |
30 | ||
31 | /* | |
32 | * The hyperbolic function below modifies the heartbeat period | |
33 | * length in dependency of the current (5min) load. It goes | |
34 | * through the points f(0)=126, f(1)=86, f(5)=51, f(inf)->30. | |
35 | */ | |
36 | period = ((672 << FSHIFT) / (5 * avenrun[0] + | |
37 | (7 << FSHIFT))) + 30; | |
38 | dist = period / 4; | |
39 | } | |
40 | } | |
41 |