2 * linux/arch/arm/mach-sa1100/leds-lart.c
4 * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
6 * LART uses the LED as follows:
7 * - GPIO23 is the LED, on if system is not idle
8 * You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
9 * time, but in that case the timer events will still dictate the
12 #include <linux/init.h>
14 #include <mach/hardware.h>
20 #define LED_STATE_ENABLED 1
21 #define LED_STATE_CLAIMED 2
23 static unsigned int led_state;
24 static unsigned int hw_led_state;
26 #define LED_23 GPIO_GPIO23
27 #define LED_MASK (LED_23)
29 void lart_leds_event(led_event_t evt)
33 local_irq_save(flags);
37 /* pin 23 is output pin */
39 hw_led_state = LED_MASK;
40 led_state = LED_STATE_ENABLED;
44 led_state &= ~LED_STATE_ENABLED;
48 led_state |= LED_STATE_CLAIMED;
49 hw_led_state = LED_MASK;
53 led_state &= ~LED_STATE_CLAIMED;
54 hw_led_state = LED_MASK;
57 #ifdef CONFIG_LEDS_TIMER
59 if (!(led_state & LED_STATE_CLAIMED))
60 hw_led_state ^= LED_23;
64 #ifdef CONFIG_LEDS_CPU
66 /* The LART people like the LED to be off when the
68 if (!(led_state & LED_STATE_CLAIMED))
69 hw_led_state &= ~LED_23;
73 /* ... and on if the system is not idle */
74 if (!(led_state & LED_STATE_CLAIMED))
75 hw_led_state |= LED_23;
80 if (led_state & LED_STATE_CLAIMED)
81 hw_led_state &= ~LED_23;
85 if (led_state & LED_STATE_CLAIMED)
86 hw_led_state |= LED_23;
93 /* Now set the GPIO state, or nothing will happen at all */
94 if (led_state & LED_STATE_ENABLED) {
96 GPCR = hw_led_state ^ LED_MASK;
99 local_irq_restore(flags);