git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/mach-footbridge/netwinder-leds.c | |
| 3 | * | |
| 4 | * Copyright (C) 1998-1999 Russell King | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * NetWinder LED control routines. | |
| 11 | * | |
| 12 | * The Netwinder uses the leds as follows: | |
| 13 | * - Green - toggles state every 50 timer interrupts | |
| 14 | * - Red - On if the system is not idle | |
| 15 | * | |
| 16 | * Changelog: | |
| 17 | * 02-05-1999 RMK Various cleanups | |
| 18 | */ | |
| 1da177e4 LT |
19 | #include <linux/module.h> |
| 20 | #include <linux/kernel.h> | |
| 21 | #include <linux/init.h> | |
| 22 | #include <linux/spinlock.h> | |
| 23 | ||
| a09e64fb | 24 | #include <mach/hardware.h> |
| 1da177e4 LT |
25 | #include <asm/leds.h> |
| 26 | #include <asm/mach-types.h> | |
| 27 | #include <asm/system.h> | |
| 28 | ||
| 29 | #define LED_STATE_ENABLED 1 | |
| 30 | #define LED_STATE_CLAIMED 2 | |
| 31 | static char led_state; | |
| 32 | static char hw_led_state; | |
| 33 | ||
| 34 | static DEFINE_SPINLOCK(leds_lock); | |
| 35 | extern spinlock_t gpio_lock; | |
| 36 | ||
| 37 | static void netwinder_leds_event(led_event_t evt) | |
| 38 | { | |
| 39 | unsigned long flags; | |
| 40 | ||
| 41 | spin_lock_irqsave(&leds_lock, flags); | |
| 42 | ||
| 43 | switch (evt) { | |
| 44 | case led_start: | |
| 45 | led_state |= LED_STATE_ENABLED; | |
| 46 | hw_led_state = GPIO_GREEN_LED; | |
| 47 | break; | |
| 48 | ||
| 49 | case led_stop: | |
| 50 | led_state &= ~LED_STATE_ENABLED; | |
| 51 | break; | |
| 52 | ||
| 53 | case led_claim: | |
| 54 | led_state |= LED_STATE_CLAIMED; | |
| 55 | hw_led_state = 0; | |
| 56 | break; | |
| 57 | ||
| 58 | case led_release: | |
| 59 | led_state &= ~LED_STATE_CLAIMED; | |
| 60 | hw_led_state = 0; | |
| 61 | break; | |
| 62 | ||
| 63 | #ifdef CONFIG_LEDS_TIMER | |
| 64 | case led_timer: | |
| 65 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 66 | hw_led_state ^= GPIO_GREEN_LED; | |
| 67 | break; | |
| 68 | #endif | |
| 69 | ||
| 70 | #ifdef CONFIG_LEDS_CPU | |
| 71 | case led_idle_start: | |
| 72 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 73 | hw_led_state &= ~GPIO_RED_LED; | |
| 74 | break; | |
| 75 | ||
| 76 | case led_idle_end: | |
| 77 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 78 | hw_led_state |= GPIO_RED_LED; | |
| 79 | break; | |
| 80 | #endif | |
| 81 | ||
| 82 | case led_halted: | |
| 83 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 84 | hw_led_state |= GPIO_RED_LED; | |
| 85 | break; | |
| 86 | ||
| 87 | case led_green_on: | |
| 88 | if (led_state & LED_STATE_CLAIMED) | |
| 89 | hw_led_state |= GPIO_GREEN_LED; | |
| 90 | break; | |
| 91 | ||
| 92 | case led_green_off: | |
| 93 | if (led_state & LED_STATE_CLAIMED) | |
| 94 | hw_led_state &= ~GPIO_GREEN_LED; | |
| 95 | break; | |
| 96 | ||
| 97 | case led_amber_on: | |
| 98 | if (led_state & LED_STATE_CLAIMED) | |
| 99 | hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED; | |
| 100 | break; | |
| 101 | ||
| 102 | case led_amber_off: | |
| 103 | if (led_state & LED_STATE_CLAIMED) | |
| 104 | hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED); | |
| 105 | break; | |
| 106 | ||
| 107 | case led_red_on: | |
| 108 | if (led_state & LED_STATE_CLAIMED) | |
| 109 | hw_led_state |= GPIO_RED_LED; | |
| 110 | break; | |
| 111 | ||
| 112 | case led_red_off: | |
| 113 | if (led_state & LED_STATE_CLAIMED) | |
| 114 | hw_led_state &= ~GPIO_RED_LED; | |
| 115 | break; | |
| 116 | ||
| 117 | default: | |
| 118 | break; | |
| 119 | } | |
| 120 | ||
| 121 | spin_unlock_irqrestore(&leds_lock, flags); | |
| 122 | ||
| 123 | if (led_state & LED_STATE_ENABLED) { | |
| 124 | spin_lock_irqsave(&gpio_lock, flags); | |
| 125 | gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state); | |
| 126 | spin_unlock_irqrestore(&gpio_lock, flags); | |
| 127 | } | |
| 128 | } | |
| 129 | ||
| 130 | static int __init leds_init(void) | |
| 131 | { | |
| 132 | if (machine_is_netwinder()) | |
| 133 | leds_event = netwinder_leds_event; | |
| 134 | ||
| 135 | leds_event(led_start); | |
| 136 | ||
| 137 | return 0; | |
| 138 | } | |
| 139 | ||
| 140 | __initcall(leds_init); |