| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-sa1100/leds-lart.c |
| 3 | * |
| 4 | * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000 |
| 5 | * |
| 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 |
| 10 | * pace of the LED. |
| 11 | */ |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/init.h> |
| 14 | |
| 15 | #include <asm/hardware.h> |
| 16 | #include <asm/leds.h> |
| 17 | #include <asm/system.h> |
| 18 | |
| 19 | #include "leds.h" |
| 20 | |
| 21 | |
| 22 | #define LED_STATE_ENABLED 1 |
| 23 | #define LED_STATE_CLAIMED 2 |
| 24 | |
| 25 | static unsigned int led_state; |
| 26 | static unsigned int hw_led_state; |
| 27 | |
| 28 | #define LED_23 GPIO_GPIO23 |
| 29 | #define LED_MASK (LED_23) |
| 30 | |
| 31 | void lart_leds_event(led_event_t evt) |
| 32 | { |
| 33 | unsigned long flags; |
| 34 | |
| 35 | local_irq_save(flags); |
| 36 | |
| 37 | switch(evt) { |
| 38 | case led_start: |
| 39 | /* pin 23 is output pin */ |
| 40 | GPDR |= LED_23; |
| 41 | hw_led_state = LED_MASK; |
| 42 | led_state = LED_STATE_ENABLED; |
| 43 | break; |
| 44 | |
| 45 | case led_stop: |
| 46 | led_state &= ~LED_STATE_ENABLED; |
| 47 | break; |
| 48 | |
| 49 | case led_claim: |
| 50 | led_state |= LED_STATE_CLAIMED; |
| 51 | hw_led_state = LED_MASK; |
| 52 | break; |
| 53 | |
| 54 | case led_release: |
| 55 | led_state &= ~LED_STATE_CLAIMED; |
| 56 | hw_led_state = LED_MASK; |
| 57 | break; |
| 58 | |
| 59 | #ifdef CONFIG_LEDS_TIMER |
| 60 | case led_timer: |
| 61 | if (!(led_state & LED_STATE_CLAIMED)) |
| 62 | hw_led_state ^= LED_23; |
| 63 | break; |
| 64 | #endif |
| 65 | |
| 66 | #ifdef CONFIG_LEDS_CPU |
| 67 | case led_idle_start: |
| 68 | /* The LART people like the LED to be off when the |
| 69 | system is idle... */ |
| 70 | if (!(led_state & LED_STATE_CLAIMED)) |
| 71 | hw_led_state &= ~LED_23; |
| 72 | break; |
| 73 | |
| 74 | case led_idle_end: |
| 75 | /* ... and on if the system is not idle */ |
| 76 | if (!(led_state & LED_STATE_CLAIMED)) |
| 77 | hw_led_state |= LED_23; |
| 78 | break; |
| 79 | #endif |
| 80 | |
| 81 | case led_red_on: |
| 82 | if (led_state & LED_STATE_CLAIMED) |
| 83 | hw_led_state &= ~LED_23; |
| 84 | break; |
| 85 | |
| 86 | case led_red_off: |
| 87 | if (led_state & LED_STATE_CLAIMED) |
| 88 | hw_led_state |= LED_23; |
| 89 | break; |
| 90 | |
| 91 | default: |
| 92 | break; |
| 93 | } |
| 94 | |
| 95 | /* Now set the GPIO state, or nothing will happen at all */ |
| 96 | if (led_state & LED_STATE_ENABLED) { |
| 97 | GPSR = hw_led_state; |
| 98 | GPCR = hw_led_state ^ LED_MASK; |
| 99 | } |
| 100 | |
| 101 | local_irq_restore(flags); |
| 102 | } |