| Andrew Victor | cc2832a | 2006-04-02 17:15:48 +0100 | [diff] [blame] | 1 | /* |
| 2 | * LED driver for Atmel AT91-based boards. |
| 3 | * |
| 4 | * Copyright (C) SAN People (Pty) Ltd |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | |
| 17 | #include <asm/mach-types.h> |
| 18 | #include <asm/leds.h> |
| 19 | #include <asm/arch/board.h> |
| 20 | #include <asm/arch/gpio.h> |
| 21 | |
| 22 | |
| 23 | static inline void at91_led_on(unsigned int led) |
| 24 | { |
| 25 | at91_set_gpio_value(led, 0); |
| 26 | } |
| 27 | |
| 28 | static inline void at91_led_off(unsigned int led) |
| 29 | { |
| 30 | at91_set_gpio_value(led, 1); |
| 31 | } |
| 32 | |
| 33 | static inline void at91_led_toggle(unsigned int led) |
| 34 | { |
| 35 | unsigned long is_off = at91_get_gpio_value(led); |
| 36 | if (is_off) |
| 37 | at91_led_on(led); |
| 38 | else |
| 39 | at91_led_off(led); |
| 40 | } |
| 41 | |
| 42 | |
| 43 | /* |
| 44 | * Handle LED events. |
| 45 | */ |
| 46 | static void at91_leds_event(led_event_t evt) |
| 47 | { |
| 48 | unsigned long flags; |
| 49 | |
| 50 | local_irq_save(flags); |
| 51 | |
| 52 | switch(evt) { |
| 53 | case led_start: /* System startup */ |
| 54 | at91_led_on(at91_leds_cpu); |
| 55 | break; |
| 56 | |
| 57 | case led_stop: /* System stop / suspend */ |
| 58 | at91_led_off(at91_leds_cpu); |
| 59 | break; |
| 60 | |
| 61 | #ifdef CONFIG_LEDS_TIMER |
| 62 | case led_timer: /* Every 50 timer ticks */ |
| 63 | at91_led_toggle(at91_leds_timer); |
| 64 | break; |
| 65 | #endif |
| 66 | |
| 67 | #ifdef CONFIG_LEDS_CPU |
| 68 | case led_idle_start: /* Entering idle state */ |
| 69 | at91_led_off(at91_leds_cpu); |
| 70 | break; |
| 71 | |
| 72 | case led_idle_end: /* Exit idle state */ |
| 73 | at91_led_on(at91_leds_cpu); |
| 74 | break; |
| 75 | #endif |
| 76 | |
| 77 | default: |
| 78 | break; |
| 79 | } |
| 80 | |
| 81 | local_irq_restore(flags); |
| 82 | } |
| 83 | |
| 84 | |
| 85 | static int __init leds_init(void) |
| 86 | { |
| 87 | if (!at91_leds_timer || !at91_leds_cpu) |
| 88 | return -ENODEV; |
| 89 | |
| 90 | /* Enable PIO to access the LEDs */ |
| 91 | at91_set_gpio_output(at91_leds_timer, 1); |
| 92 | at91_set_gpio_output(at91_leds_cpu, 1); |
| 93 | |
| 94 | leds_event = at91_leds_event; |
| 95 | |
| 96 | leds_event(led_start); |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | __initcall(leds_init); |