ALSA: virtuoso: rename AC97 callback function
[zen-stable.git] / arch / arm / mach-footbridge / netwinder-leds.c
blobd91a4f4a32dc227161464b47abaa3eaee981e114
1 /*
2 * linux/arch/arm/mach-footbridge/netwinder-leds.c
4 * Copyright (C) 1998-1999 Russell King
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.
10 * NetWinder LED control routines.
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
16 * Changelog:
17 * 02-05-1999 RMK Various cleanups
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/spinlock.h>
24 #include <mach/hardware.h>
25 #include <asm/leds.h>
26 #include <asm/mach-types.h>
27 #include <asm/system.h>
29 #define LED_STATE_ENABLED 1
30 #define LED_STATE_CLAIMED 2
31 static char led_state;
32 static char hw_led_state;
34 static DEFINE_SPINLOCK(leds_lock);
35 extern spinlock_t gpio_lock;
37 static void netwinder_leds_event(led_event_t evt)
39 unsigned long flags;
41 spin_lock_irqsave(&leds_lock, flags);
43 switch (evt) {
44 case led_start:
45 led_state |= LED_STATE_ENABLED;
46 hw_led_state = GPIO_GREEN_LED;
47 break;
49 case led_stop:
50 led_state &= ~LED_STATE_ENABLED;
51 break;
53 case led_claim:
54 led_state |= LED_STATE_CLAIMED;
55 hw_led_state = 0;
56 break;
58 case led_release:
59 led_state &= ~LED_STATE_CLAIMED;
60 hw_led_state = 0;
61 break;
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
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;
76 case led_idle_end:
77 if (!(led_state & LED_STATE_CLAIMED))
78 hw_led_state |= GPIO_RED_LED;
79 break;
80 #endif
82 case led_halted:
83 if (!(led_state & LED_STATE_CLAIMED))
84 hw_led_state |= GPIO_RED_LED;
85 break;
87 case led_green_on:
88 if (led_state & LED_STATE_CLAIMED)
89 hw_led_state |= GPIO_GREEN_LED;
90 break;
92 case led_green_off:
93 if (led_state & LED_STATE_CLAIMED)
94 hw_led_state &= ~GPIO_GREEN_LED;
95 break;
97 case led_amber_on:
98 if (led_state & LED_STATE_CLAIMED)
99 hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
100 break;
102 case led_amber_off:
103 if (led_state & LED_STATE_CLAIMED)
104 hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
105 break;
107 case led_red_on:
108 if (led_state & LED_STATE_CLAIMED)
109 hw_led_state |= GPIO_RED_LED;
110 break;
112 case led_red_off:
113 if (led_state & LED_STATE_CLAIMED)
114 hw_led_state &= ~GPIO_RED_LED;
115 break;
117 default:
118 break;
121 spin_unlock_irqrestore(&leds_lock, flags);
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);
130 static int __init leds_init(void)
132 if (machine_is_netwinder())
133 leds_event = netwinder_leds_event;
135 leds_event(led_start);
137 return 0;
140 __initcall(leds_init);