1 /* 2 * linux/arch/arm/mach-sa1100/leds-hackkit.c 3 * 4 * based on leds-lart.c 5 * 6 * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000 7 * (C) Stefan Eletzhofer <stefan.eletzhofer@eletztrick.de>, 2002 8 * 9 * The HackKit has two leds (GPIO 22/23). The red led (gpio 22) is used 10 * as cpu led, the green one is used as timer led. 11 */ 12 #include <linux/init.h> 13 14 #include <mach/hardware.h> 15 #include <asm/leds.h> 16 17 #include "leds.h" 18 19 20 #define LED_STATE_ENABLED 1 21 #define LED_STATE_CLAIMED 2 22 23 static unsigned int led_state; 24 static unsigned int hw_led_state; 25 26 #define LED_GREEN GPIO_GPIO23 27 #define LED_RED GPIO_GPIO22 28 #define LED_MASK (LED_RED | LED_GREEN) 29 hackkit_leds_event(led_event_t evt)30void hackkit_leds_event(led_event_t evt) 31 { 32 unsigned long flags; 33 34 local_irq_save(flags); 35 36 switch(evt) { 37 case led_start: 38 /* pin 22/23 are outputs */ 39 GPDR |= LED_MASK; 40 hw_led_state = LED_MASK; 41 led_state = LED_STATE_ENABLED; 42 break; 43 44 case led_stop: 45 led_state &= ~LED_STATE_ENABLED; 46 break; 47 48 case led_claim: 49 led_state |= LED_STATE_CLAIMED; 50 hw_led_state = LED_MASK; 51 break; 52 53 case led_release: 54 led_state &= ~LED_STATE_CLAIMED; 55 hw_led_state = LED_MASK; 56 break; 57 58 #ifdef CONFIG_LEDS_TIMER 59 case led_timer: 60 if (!(led_state & LED_STATE_CLAIMED)) 61 hw_led_state ^= LED_GREEN; 62 break; 63 #endif 64 65 #ifdef CONFIG_LEDS_CPU 66 case led_idle_start: 67 /* The LART people like the LED to be off when the 68 system is idle... */ 69 if (!(led_state & LED_STATE_CLAIMED)) 70 hw_led_state &= ~LED_RED; 71 break; 72 73 case led_idle_end: 74 /* ... and on if the system is not idle */ 75 if (!(led_state & LED_STATE_CLAIMED)) 76 hw_led_state |= LED_RED; 77 break; 78 #endif 79 80 case led_red_on: 81 if (led_state & LED_STATE_CLAIMED) 82 hw_led_state &= ~LED_RED; 83 break; 84 85 case led_red_off: 86 if (led_state & LED_STATE_CLAIMED) 87 hw_led_state |= LED_RED; 88 break; 89 90 case led_green_on: 91 if (led_state & LED_STATE_CLAIMED) 92 hw_led_state &= ~LED_GREEN; 93 break; 94 95 case led_green_off: 96 if (led_state & LED_STATE_CLAIMED) 97 hw_led_state |= LED_GREEN; 98 break; 99 100 default: 101 break; 102 } 103 104 /* Now set the GPIO state, or nothing will happen at all */ 105 if (led_state & LED_STATE_ENABLED) { 106 GPSR = hw_led_state; 107 GPCR = hw_led_state ^ LED_MASK; 108 } 109 110 local_irq_restore(flags); 111 } 112