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-rw-r--r--arch/arm/mach-sa1100/leds-lart.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/leds-lart.c b/arch/arm/mach-sa1100/leds-lart.c
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+/*
+ * linux/arch/arm/mach-sa1100/leds-lart.c
+ *
+ * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
+ *
+ * LART uses the LED as follows:
+ * - GPIO23 is the LED, on if system is not idle
+ * You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
+ * time, but in that case the timer events will still dictate the
+ * pace of the LED.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <asm/hardware.h>
+#include <asm/leds.h>
+#include <asm/system.h>
+
+#include "leds.h"
+
+
+#define LED_STATE_ENABLED 1
+#define LED_STATE_CLAIMED 2
+
+static unsigned int led_state;
+static unsigned int hw_led_state;
+
+#define LED_23 GPIO_GPIO23
+#define LED_MASK (LED_23)
+
+void lart_leds_event(led_event_t evt)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ switch(evt) {
+ case led_start:
+ /* pin 23 is output pin */
+ GPDR |= LED_23;
+ hw_led_state = LED_MASK;
+ led_state = LED_STATE_ENABLED;
+ break;
+
+ case led_stop:
+ led_state &= ~LED_STATE_ENABLED;
+ break;
+
+ case led_claim:
+ led_state |= LED_STATE_CLAIMED;
+ hw_led_state = LED_MASK;
+ break;
+
+ case led_release:
+ led_state &= ~LED_STATE_CLAIMED;
+ hw_led_state = LED_MASK;
+ break;
+
+#ifdef CONFIG_LEDS_TIMER
+ case led_timer:
+ if (!(led_state & LED_STATE_CLAIMED))
+ hw_led_state ^= LED_23;
+ break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+ case led_idle_start:
+ /* The LART people like the LED to be off when the
+ system is idle... */
+ if (!(led_state & LED_STATE_CLAIMED))
+ hw_led_state &= ~LED_23;
+ break;
+
+ case led_idle_end:
+ /* ... and on if the system is not idle */
+ if (!(led_state & LED_STATE_CLAIMED))
+ hw_led_state |= LED_23;
+ break;
+#endif
+
+ case led_red_on:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state &= ~LED_23;
+ break;
+
+ case led_red_off:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state |= LED_23;
+ break;
+
+ default:
+ break;
+ }
+
+ /* Now set the GPIO state, or nothing will happen at all */
+ if (led_state & LED_STATE_ENABLED) {
+ GPSR = hw_led_state;
+ GPCR = hw_led_state ^ LED_MASK;
+ }
+
+ local_irq_restore(flags);
+}