patch-2.4.6 linux/arch/sh/kernel/led_bigsur.c

• Lines: 56
• Date: Wed Jun 27 13:55:29 2001
• Orig file: v2.4.5/linux/arch/sh/kernel/led_bigsur.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/arch/sh/kernel/led_bigsur.c linux/arch/sh/kernel/led_bigsur.c
@@ -0,0 +1,55 @@
+/*
+ * linux/arch/sh/kernel/led_bigsur.c
+ *
+ * By Dustin McIntire (dustin@sensoria.com) (c)2001
+ * Derived from led_se.c and led.c, which bore the message:
+ * 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 Big Sur specific LED code.
+ */
+
+#include <linux/config.h>
+#include <asm/io.h>
+#include <asm/bigsur.h>
+
+static void mach_led(int position, int value)
+{
+	int word;
+	
+	word = bigsur_inl(BIGSUR_CSLR);
+	if (value) {
+		bigsur_outl(word & ~BIGSUR_LED, BIGSUR_CSLR);
+	} else {
+		bigsur_outl(word | BIGSUR_LED, BIGSUR_CSLR);
+	}
+}
+
+#ifdef CONFIG_HEARTBEAT
+
+#include <linux/sched.h>
+
+/* Cycle the LED on/off */
+void heartbeat_bigsur(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 /* CONFIG_HEARTBEAT */
+