Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 24 | #include <mach/hardware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/leds.h> |
| 26 | #include <asm/mach-types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | #define LED_STATE_ENABLED 1 |
| 29 | #define LED_STATE_CLAIMED 2 |
| 30 | static char led_state; |
| 31 | static char hw_led_state; |
| 32 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 33 | static DEFINE_RAW_SPINLOCK(leds_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | static void netwinder_leds_event(led_event_t evt) |
| 36 | { |
| 37 | unsigned long flags; |
| 38 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 39 | raw_spin_lock_irqsave(&leds_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | switch (evt) { |
| 42 | case led_start: |
| 43 | led_state |= LED_STATE_ENABLED; |
| 44 | hw_led_state = GPIO_GREEN_LED; |
| 45 | break; |
| 46 | |
| 47 | case led_stop: |
| 48 | led_state &= ~LED_STATE_ENABLED; |
| 49 | break; |
| 50 | |
| 51 | case led_claim: |
| 52 | led_state |= LED_STATE_CLAIMED; |
| 53 | hw_led_state = 0; |
| 54 | break; |
| 55 | |
| 56 | case led_release: |
| 57 | led_state &= ~LED_STATE_CLAIMED; |
| 58 | hw_led_state = 0; |
| 59 | break; |
| 60 | |
| 61 | #ifdef CONFIG_LEDS_TIMER |
| 62 | case led_timer: |
| 63 | if (!(led_state & LED_STATE_CLAIMED)) |
| 64 | hw_led_state ^= GPIO_GREEN_LED; |
| 65 | break; |
| 66 | #endif |
| 67 | |
| 68 | #ifdef CONFIG_LEDS_CPU |
| 69 | case led_idle_start: |
| 70 | if (!(led_state & LED_STATE_CLAIMED)) |
| 71 | hw_led_state &= ~GPIO_RED_LED; |
| 72 | break; |
| 73 | |
| 74 | case led_idle_end: |
| 75 | if (!(led_state & LED_STATE_CLAIMED)) |
| 76 | hw_led_state |= GPIO_RED_LED; |
| 77 | break; |
| 78 | #endif |
| 79 | |
| 80 | case led_halted: |
| 81 | if (!(led_state & LED_STATE_CLAIMED)) |
| 82 | hw_led_state |= GPIO_RED_LED; |
| 83 | break; |
| 84 | |
| 85 | case led_green_on: |
| 86 | if (led_state & LED_STATE_CLAIMED) |
| 87 | hw_led_state |= GPIO_GREEN_LED; |
| 88 | break; |
| 89 | |
| 90 | case led_green_off: |
| 91 | if (led_state & LED_STATE_CLAIMED) |
| 92 | hw_led_state &= ~GPIO_GREEN_LED; |
| 93 | break; |
| 94 | |
| 95 | case led_amber_on: |
| 96 | if (led_state & LED_STATE_CLAIMED) |
| 97 | hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED; |
| 98 | break; |
| 99 | |
| 100 | case led_amber_off: |
| 101 | if (led_state & LED_STATE_CLAIMED) |
| 102 | hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED); |
| 103 | break; |
| 104 | |
| 105 | case led_red_on: |
| 106 | if (led_state & LED_STATE_CLAIMED) |
| 107 | hw_led_state |= GPIO_RED_LED; |
| 108 | break; |
| 109 | |
| 110 | case led_red_off: |
| 111 | if (led_state & LED_STATE_CLAIMED) |
| 112 | hw_led_state &= ~GPIO_RED_LED; |
| 113 | break; |
| 114 | |
| 115 | default: |
| 116 | break; |
| 117 | } |
| 118 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 119 | raw_spin_unlock_irqrestore(&leds_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | if (led_state & LED_STATE_ENABLED) { |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 122 | raw_spin_lock_irqsave(&nw_gpio_lock, flags); |
Russell King | 70d13e0 | 2008-12-06 08:25:16 +0000 | [diff] [blame] | 123 | nw_gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 124 | raw_spin_unlock_irqrestore(&nw_gpio_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | } |
| 126 | } |
| 127 | |
| 128 | static int __init leds_init(void) |
| 129 | { |
| 130 | if (machine_is_netwinder()) |
| 131 | leds_event = netwinder_leds_event; |
| 132 | |
| 133 | leds_event(led_start); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | __initcall(leds_init); |