patch-2.4.4 linux/arch/arm/mach-shark/leds.c

• Lines: 164
• Date: Thu Apr 12 12:20:31 2001
• Orig file: v2.4.3/linux/arch/arm/mach-shark/leds.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/arm/mach-shark/leds.c linux/arch/arm/mach-shark/leds.c
@@ -0,0 +1,163 @@
+/*
+ * arch/arm/kernel/leds-shark.c
+ * by Alexander Schulz <aschulz@netwinder.org>
+ *
+ * derived from:
+ * arch/arm/kernel/leds-footbridge.c
+ * Copyright (C) 1998-1999 Russell King
+ *
+ * DIGITAL Shark LED control routines.
+ *
+ * The leds use is as follows:
+ *  - Green front - toggles state every 50 timer interrupts
+ *  - Amber front - Unused, this is a dual color led (Amber/Green)
+ *  - Amber back  - On if system is not idle
+ *
+ * Changelog:
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/ioport.h>
+
+#include <asm/hardware.h>
+#include <asm/leds.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#define LED_STATE_ENABLED	1
+#define LED_STATE_CLAIMED	2
+static char led_state;
+static short hw_led_state;
+static short saved_state;
+
+static spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;
+
+short sequoia_read(int addr) {
+  outw(addr,0x24);
+  return inw(0x26);
+}
+
+void sequoia_write(short value,short addr) {
+  outw(addr,0x24);
+  outw(value,0x26);
+}
+
+static void sequoia_leds_event(led_event_t evt)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&leds_lock, flags);
+
+	hw_led_state = sequoia_read(0x09);
+
+	switch (evt) {
+	case led_start:
+		hw_led_state |= SEQUOIA_LED_GREEN;
+		hw_led_state |= SEQUOIA_LED_AMBER;
+#ifdef CONFIG_LEDS_CPU
+		hw_led_state |= SEQUOIA_LED_BACK;
+#else
+		hw_led_state &= ~SEQUOIA_LED_BACK;
+#endif
+		led_state |= LED_STATE_ENABLED;
+		break;
+
+	case led_stop:
+		hw_led_state &= ~SEQUOIA_LED_BACK;
+		hw_led_state |= SEQUOIA_LED_GREEN;
+		hw_led_state |= SEQUOIA_LED_AMBER;
+		led_state &= ~LED_STATE_ENABLED;
+		break;
+
+	case led_claim:
+		led_state |= LED_STATE_CLAIMED;
+		saved_state = hw_led_state;
+		hw_led_state &= ~SEQUOIA_LED_BACK;
+		hw_led_state |= SEQUOIA_LED_GREEN;
+		hw_led_state |= SEQUOIA_LED_AMBER;
+		break;
+
+	case led_release:
+		led_state &= ~LED_STATE_CLAIMED;
+		hw_led_state = saved_state;
+		break;
+
+#ifdef CONFIG_LEDS_TIMER
+	case led_timer:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state ^= SEQUOIA_LED_GREEN;
+		break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+	case led_idle_start:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state &= ~SEQUOIA_LED_BACK;
+		break;
+
+	case led_idle_end:
+		if (!(led_state & LED_STATE_CLAIMED))
+			hw_led_state |= SEQUOIA_LED_BACK;
+		break;
+#endif
+
+	case led_green_on:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state &= ~SEQUOIA_LED_GREEN;
+		break;
+
+	case led_green_off:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state |= SEQUOIA_LED_GREEN;
+		break;
+
+	case led_amber_on:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state &= ~SEQUOIA_LED_AMBER;
+		break;
+
+	case led_amber_off:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state |= SEQUOIA_LED_AMBER;
+		break;
+
+	case led_red_on:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state |= SEQUOIA_LED_BACK;
+		break;
+
+	case led_red_off:
+		if (led_state & LED_STATE_CLAIMED)
+			hw_led_state &= ~SEQUOIA_LED_BACK;
+		break;
+
+	default:
+		break;
+	}
+
+	if  (led_state & LED_STATE_ENABLED)
+		sequoia_write(hw_led_state,0x09);
+
+	spin_unlock_irqrestore(&leds_lock, flags);
+}
+
+static int __init leds_init(void)
+{
+	extern void (*leds_event)(led_event_t);
+	short temp;
+	
+	leds_event = sequoia_leds_event;
+
+	/* Make LEDs independent of power-state */
+	request_region(0x24,4,"sequoia");
+	temp = sequoia_read(0x09);
+	temp |= 1<<10;
+	sequoia_write(temp,0x09);
+	leds_event(led_start);
+	return 0;
+}
+
+__initcall(leds_init);