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gerrit-public.fairphone.software / kernel / msm-4.9 / 0e6dcde7288f1de8e2a5896349342de5d316d3cb / . / arch / arm / mach-footbridge / ebsa285-leds.c
blob: 5bd266754b95f4eb571fd91eb14087418430039a [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
Russell Kinga09e64f2008-08-05 16:14:15 +0100[diff] [blame]24#include <mach/hardware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]25#include <asm/leds.h>
26#include <asm/mach-types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]27
28#define LED_STATE_ENABLED 1
29#define LED_STATE_CLAIMED 2
30static char led_state;
31static char hw_led_state;
32
33static DEFINE_SPINLOCK(leds_lock);
34
35static void ebsa285_leds_event(led_event_t evt)
36{
37 unsigned long flags;
38
39 spin_lock_irqsave(&leds_lock, flags);
40
41 switch (evt) {
42 case led_start:
43 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
44#ifndef CONFIG_LEDS_CPU
45 hw_led_state |= XBUS_LED_AMBER;
46#endif
47 led_state |= LED_STATE_ENABLED;
48 break;
49
50 case led_stop:
51 led_state &= ~LED_STATE_ENABLED;
52 break;
53
54 case led_claim:
55 led_state |= LED_STATE_CLAIMED;
56 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
57 break;
58
59 case led_release:
60 led_state &= ~LED_STATE_CLAIMED;
61 hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
62 break;
63
64#ifdef CONFIG_LEDS_TIMER
65 case led_timer:
66 if (!(led_state & LED_STATE_CLAIMED))
67 hw_led_state ^= XBUS_LED_GREEN;
68 break;
69#endif
70
71#ifdef CONFIG_LEDS_CPU
72 case led_idle_start:
73 if (!(led_state & LED_STATE_CLAIMED))
74 hw_led_state |= XBUS_LED_AMBER;
75 break;
76
77 case led_idle_end:
78 if (!(led_state & LED_STATE_CLAIMED))
79 hw_led_state &= ~XBUS_LED_AMBER;
80 break;
81#endif
82
83 case led_halted:
84 if (!(led_state & LED_STATE_CLAIMED))
85 hw_led_state &= ~XBUS_LED_RED;
86 break;
87
88 case led_green_on:
89 if (led_state & LED_STATE_CLAIMED)
90 hw_led_state &= ~XBUS_LED_GREEN;
91 break;
92
93 case led_green_off:
94 if (led_state & LED_STATE_CLAIMED)
95 hw_led_state |= XBUS_LED_GREEN;
96 break;
97
98 case led_amber_on:
99 if (led_state & LED_STATE_CLAIMED)
100 hw_led_state &= ~XBUS_LED_AMBER;
101 break;
102
103 case led_amber_off:
104 if (led_state & LED_STATE_CLAIMED)
105 hw_led_state |= XBUS_LED_AMBER;
106 break;
107
108 case led_red_on:
109 if (led_state & LED_STATE_CLAIMED)
110 hw_led_state &= ~XBUS_LED_RED;
111 break;
112
113 case led_red_off:
114 if (led_state & LED_STATE_CLAIMED)
115 hw_led_state |= XBUS_LED_RED;
116 break;
117
118 default:
119 break;
120 }
121
122 if (led_state & LED_STATE_ENABLED)
123 *XBUS_LEDS = hw_led_state;
124
125 spin_unlock_irqrestore(&leds_lock, flags);
126}
127
128static int __init leds_init(void)
129{
Adrian Bunke055d5bf2008-04-22 01:43:27 +0100[diff] [blame]130 if (machine_is_ebsa285())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]131 leds_event = ebsa285_leds_event;
132
133 leds_event(led_start);
134
135 return 0;
136}
137
138__initcall(leds_init);