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review.evervolv.com / android_kernel_htc_msm8960 / f2802e7f571c05f9a901b1f5bd144aa730ccc88e / . / arch / arm / mach-footbridge / ebsa285-leds.c
blob: a64e22226515ba88ec289e00648c448b017f5fe8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * linux/arch/arm/mach-footbridge/ebsa285-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 * EBSA-285 control routines.
10 *
11 * The EBSA-285 uses the leds as follows:
12 * - Green - toggles state every 50 timer interrupts
13 * - Amber - On if system is not idle
14 * - Red - currently unused
15 *
16 * Changelog:
17 * 02-05-1999 RMK Various cleanups
18 */
Linus Torvalds1da177e2005-04-16 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
24#include <asm/hardware.h>
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
31static char led_state;
32static char hw_led_state;
33
34static DEFINE_SPINLOCK(leds_lock);
35
36static void ebsa285_leds_event(led_event_t evt)
37{
38 unsigned long flags;
39
40 spin_lock_irqsave(&leds_lock, flags);
41
42 switch (evt) {
43 case led_start:
44 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
45#ifndef CONFIG_LEDS_CPU
46 hw_led_state |= XBUS_LED_AMBER;
47#endif
48 led_state |= LED_STATE_ENABLED;
49 break;
50
51 case led_stop:
52 led_state &= ~LED_STATE_ENABLED;
53 break;
54
55 case led_claim:
56 led_state |= LED_STATE_CLAIMED;
57 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
58 break;
59
60 case led_release:
61 led_state &= ~LED_STATE_CLAIMED;
62 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
63 break;
64
65#ifdef CONFIG_LEDS_TIMER
66 case led_timer:
67 if (!(led_state & LED_STATE_CLAIMED))
68 hw_led_state ^= XBUS_LED_GREEN;
69 break;
70#endif
71
72#ifdef CONFIG_LEDS_CPU
73 case led_idle_start:
74 if (!(led_state & LED_STATE_CLAIMED))
75 hw_led_state |= XBUS_LED_AMBER;
76 break;
77
78 case led_idle_end:
79 if (!(led_state & LED_STATE_CLAIMED))
80 hw_led_state &= ~XBUS_LED_AMBER;
81 break;
82#endif
83
84 case led_halted:
85 if (!(led_state & LED_STATE_CLAIMED))
86 hw_led_state &= ~XBUS_LED_RED;
87 break;
88
89 case led_green_on:
90 if (led_state & LED_STATE_CLAIMED)
91 hw_led_state &= ~XBUS_LED_GREEN;
92 break;
93
94 case led_green_off:
95 if (led_state & LED_STATE_CLAIMED)
96 hw_led_state |= XBUS_LED_GREEN;
97 break;
98
99 case led_amber_on:
100 if (led_state & LED_STATE_CLAIMED)
101 hw_led_state &= ~XBUS_LED_AMBER;
102 break;
103
104 case led_amber_off:
105 if (led_state & LED_STATE_CLAIMED)
106 hw_led_state |= XBUS_LED_AMBER;
107 break;
108
109 case led_red_on:
110 if (led_state & LED_STATE_CLAIMED)
111 hw_led_state &= ~XBUS_LED_RED;
112 break;
113
114 case led_red_off:
115 if (led_state & LED_STATE_CLAIMED)
116 hw_led_state |= XBUS_LED_RED;
117 break;
118
119 default:
120 break;
121 }
122
123 if (led_state & LED_STATE_ENABLED)
124 *XBUS_LEDS = hw_led_state;
125
126 spin_unlock_irqrestore(&leds_lock, flags);
127}
128
129static int __init leds_init(void)
130{
131 if (machine_is_ebsa285() || machine_is_co285())
132 leds_event = ebsa285_leds_event;
133
134 leds_event(led_start);
135
136 return 0;
137}
138
139__initcall(leds_init);