patch-2.4.6 linux/arch/sh/stboards/led.c
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- Lines: 53
- Date:
Wed Jun 27 13:55:29 2001
- Orig file:
v2.4.5/linux/arch/sh/stboards/led.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.5/linux/arch/sh/stboards/led.c linux/arch/sh/stboards/led.c
@@ -0,0 +1,52 @@
+/*
+ * linux/arch/sh/stboards/led.c
+ *
+ * Copyright (C) 2000 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.
+ *
+ * This file contains ST40STB1 HARP and compatible code.
+ */
+
+#include <linux/config.h>
+#include <asm/io.h>
+#include "harp.h"
+
+/* Harp: Flash LD10 (front pannel) connected to EPLD (IC8) */
+/* Overdrive: Flash LD1 (front panel) connected to EPLD (IC4) */
+/* Works for HARP and overdrive */
+static void mach_led(int position, int value)
+{
+ if (value) {
+ ctrl_outl(EPLD_LED_ON, EPLD_LED);
+ } else {
+ ctrl_outl(EPLD_LED_OFF, EPLD_LED);
+ }
+}
+
+#ifdef CONFIG_HEARTBEAT
+
+#include <linux/sched.h>
+
+/* acts like an actual heart beat -- ie thump-thump-pause... */
+void heartbeat_harp(void)
+{
+ static unsigned 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;
+ }
+}
+#endif
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