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 | |
Andrew Victor | cc2832a | 2006-04-02 17:15:48 +0100 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame^] | 16 | #include <mach/board.h> |
| 17 | #include <mach/gpio.h> |
Andrew Victor | cc2832a | 2006-04-02 17:15:48 +0100 | [diff] [blame] | 18 | |
| 19 | |
Andrew Victor | a04ff1a | 2008-01-23 09:27:06 +0100 | [diff] [blame] | 20 | /* ------------------------------------------------------------------------- */ |
| 21 | |
| 22 | #if defined(CONFIG_NEW_LEDS) |
| 23 | |
| 24 | #include <linux/platform_device.h> |
| 25 | |
| 26 | /* |
| 27 | * New cross-platform LED support. |
| 28 | */ |
| 29 | |
| 30 | static struct gpio_led_platform_data led_data; |
| 31 | |
| 32 | static struct platform_device at91_leds = { |
| 33 | .name = "leds-gpio", |
| 34 | .id = -1, |
| 35 | .dev.platform_data = &led_data, |
| 36 | }; |
| 37 | |
| 38 | void __init at91_gpio_leds(struct gpio_led *leds, int nr) |
| 39 | { |
| 40 | int i; |
| 41 | |
| 42 | if (!nr) |
| 43 | return; |
| 44 | |
| 45 | for (i = 0; i < nr; i++) |
| 46 | at91_set_gpio_output(leds[i].gpio, leds[i].active_low); |
| 47 | |
| 48 | led_data.leds = leds; |
| 49 | led_data.num_leds = nr; |
| 50 | platform_device_register(&at91_leds); |
| 51 | } |
| 52 | |
| 53 | #else |
| 54 | void __init at91_gpio_leds(struct gpio_led *leds, int nr) {} |
| 55 | #endif |
| 56 | |
| 57 | |
| 58 | /* ------------------------------------------------------------------------- */ |
| 59 | |
| 60 | #if defined(CONFIG_LEDS) |
| 61 | |
| 62 | #include <asm/leds.h> |
| 63 | |
| 64 | /* |
| 65 | * Old ARM-specific LED framework; not fully functional when generic time is |
| 66 | * in use. |
| 67 | */ |
| 68 | |
| 69 | static u8 at91_leds_cpu; |
| 70 | static u8 at91_leds_timer; |
| 71 | |
Andrew Victor | cc2832a | 2006-04-02 17:15:48 +0100 | [diff] [blame] | 72 | static inline void at91_led_on(unsigned int led) |
| 73 | { |
| 74 | at91_set_gpio_value(led, 0); |
| 75 | } |
| 76 | |
| 77 | static inline void at91_led_off(unsigned int led) |
| 78 | { |
| 79 | at91_set_gpio_value(led, 1); |
| 80 | } |
| 81 | |
| 82 | static inline void at91_led_toggle(unsigned int led) |
| 83 | { |
| 84 | unsigned long is_off = at91_get_gpio_value(led); |
| 85 | if (is_off) |
| 86 | at91_led_on(led); |
| 87 | else |
| 88 | at91_led_off(led); |
| 89 | } |
| 90 | |
| 91 | |
| 92 | /* |
| 93 | * Handle LED events. |
| 94 | */ |
| 95 | static void at91_leds_event(led_event_t evt) |
| 96 | { |
| 97 | unsigned long flags; |
| 98 | |
| 99 | local_irq_save(flags); |
| 100 | |
| 101 | switch(evt) { |
| 102 | case led_start: /* System startup */ |
| 103 | at91_led_on(at91_leds_cpu); |
| 104 | break; |
| 105 | |
| 106 | case led_stop: /* System stop / suspend */ |
| 107 | at91_led_off(at91_leds_cpu); |
| 108 | break; |
| 109 | |
| 110 | #ifdef CONFIG_LEDS_TIMER |
| 111 | case led_timer: /* Every 50 timer ticks */ |
| 112 | at91_led_toggle(at91_leds_timer); |
| 113 | break; |
| 114 | #endif |
| 115 | |
| 116 | #ifdef CONFIG_LEDS_CPU |
| 117 | case led_idle_start: /* Entering idle state */ |
| 118 | at91_led_off(at91_leds_cpu); |
| 119 | break; |
| 120 | |
| 121 | case led_idle_end: /* Exit idle state */ |
| 122 | at91_led_on(at91_leds_cpu); |
| 123 | break; |
| 124 | #endif |
| 125 | |
| 126 | default: |
| 127 | break; |
| 128 | } |
| 129 | |
| 130 | local_irq_restore(flags); |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static int __init leds_init(void) |
| 135 | { |
| 136 | if (!at91_leds_timer || !at91_leds_cpu) |
| 137 | return -ENODEV; |
| 138 | |
Andrew Victor | cc2832a | 2006-04-02 17:15:48 +0100 | [diff] [blame] | 139 | leds_event = at91_leds_event; |
| 140 | |
| 141 | leds_event(led_start); |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | __initcall(leds_init); |
Andrew Victor | a04ff1a | 2008-01-23 09:27:06 +0100 | [diff] [blame] | 146 | |
| 147 | |
| 148 | void __init at91_init_leds(u8 cpu_led, u8 timer_led) |
| 149 | { |
| 150 | /* Enable GPIO to access the LEDs */ |
| 151 | at91_set_gpio_output(cpu_led, 1); |
| 152 | at91_set_gpio_output(timer_led, 1); |
| 153 | |
| 154 | at91_leds_cpu = cpu_led; |
| 155 | at91_leds_timer = timer_led; |
| 156 | } |
| 157 | |
| 158 | #else |
| 159 | void __init at91_init_leds(u8 cpu_led, u8 timer_led) {} |
| 160 | #endif |