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gerrit-public.fairphone.software / kernel / msm / 8a9343fa24d8d3fcb189bed2b7afcf4b8a8c1c8d / . / arch / arm / mach-footbridge / ebsa285-leds.c
blob: 2c7c3630401bd2968544653331380dd719ab29a0 [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 */
19#include <linux/config.h>
20#include <linux/module.h>
21#include <linux/kernel.h>
22#include <linux/init.h>
23#include <linux/spinlock.h>
24
25#include <asm/hardware.h>
26#include <asm/leds.h>
27#include <asm/mach-types.h>
28#include <asm/system.h>
29
30#define LED_STATE_ENABLED 1
31#define LED_STATE_CLAIMED 2
32static char led_state;
33static char hw_led_state;
34
35static DEFINE_SPINLOCK(leds_lock);
36
37static void ebsa285_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 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
46#ifndef CONFIG_LEDS_CPU
47 hw_led_state |= XBUS_LED_AMBER;
48#endif
49 led_state |= LED_STATE_ENABLED;
50 break;
51
52 case led_stop:
53 led_state &= ~LED_STATE_ENABLED;
54 break;
55
56 case led_claim:
57 led_state |= LED_STATE_CLAIMED;
58 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
59 break;
60
61 case led_release:
62 led_state &= ~LED_STATE_CLAIMED;
63 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
64 break;
65
66#ifdef CONFIG_LEDS_TIMER
67 case led_timer:
68 if (!(led_state & LED_STATE_CLAIMED))
69 hw_led_state ^= XBUS_LED_GREEN;
70 break;
71#endif
72
73#ifdef CONFIG_LEDS_CPU
74 case led_idle_start:
75 if (!(led_state & LED_STATE_CLAIMED))
76 hw_led_state |= XBUS_LED_AMBER;
77 break;
78
79 case led_idle_end:
80 if (!(led_state & LED_STATE_CLAIMED))
81 hw_led_state &= ~XBUS_LED_AMBER;
82 break;
83#endif
84
85 case led_halted:
86 if (!(led_state & LED_STATE_CLAIMED))
87 hw_led_state &= ~XBUS_LED_RED;
88 break;
89
90 case led_green_on:
91 if (led_state & LED_STATE_CLAIMED)
92 hw_led_state &= ~XBUS_LED_GREEN;
93 break;
94
95 case led_green_off:
96 if (led_state & LED_STATE_CLAIMED)
97 hw_led_state |= XBUS_LED_GREEN;
98 break;
99
100 case led_amber_on:
101 if (led_state & LED_STATE_CLAIMED)
102 hw_led_state &= ~XBUS_LED_AMBER;
103 break;
104
105 case led_amber_off:
106 if (led_state & LED_STATE_CLAIMED)
107 hw_led_state |= XBUS_LED_AMBER;
108 break;
109
110 case led_red_on:
111 if (led_state & LED_STATE_CLAIMED)
112 hw_led_state &= ~XBUS_LED_RED;
113 break;
114
115 case led_red_off:
116 if (led_state & LED_STATE_CLAIMED)
117 hw_led_state |= XBUS_LED_RED;
118 break;
119
120 default:
121 break;
122 }
123
124 if (led_state & LED_STATE_ENABLED)
125 *XBUS_LEDS = hw_led_state;
126
127 spin_unlock_irqrestore(&leds_lock, flags);
128}
129
130static int __init leds_init(void)
131{
132 if (machine_is_ebsa285() || machine_is_co285())
133 leds_event = ebsa285_leds_event;
134
135 leds_event(led_start);
136
137 return 0;
138}
139
140__initcall(leds_init);