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review.evervolv.com / android_kernel_htc_msm8960 / ada70d9425bcc5e376fef8591e4e76e204c0834c / . / arch / arm / mach-footbridge / netwinder-leds.c
blob: 7451fc07b85aa48199603f8603796d1be7af334f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 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 */
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);
36extern spinlock_t gpio_lock;
37
38static void netwinder_leds_event(led_event_t evt)
39{
40 unsigned long flags;
41
42 spin_lock_irqsave(&leds_lock, flags);
43
44 switch (evt) {
45 case led_start:
46 led_state |= LED_STATE_ENABLED;
47 hw_led_state = GPIO_GREEN_LED;
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 = 0;
57 break;
58
59 case led_release:
60 led_state &= ~LED_STATE_CLAIMED;
61 hw_led_state = 0;
62 break;
63
64#ifdef CONFIG_LEDS_TIMER
65 case led_timer:
66 if (!(led_state & LED_STATE_CLAIMED))
67 hw_led_state ^= GPIO_GREEN_LED;
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 &= ~GPIO_RED_LED;
75 break;
76
77 case led_idle_end:
78 if (!(led_state & LED_STATE_CLAIMED))
79 hw_led_state |= GPIO_RED_LED;
80 break;
81#endif
82
83 case led_halted:
84 if (!(led_state & LED_STATE_CLAIMED))
85 hw_led_state |= GPIO_RED_LED;
86 break;
87
88 case led_green_on:
89 if (led_state & LED_STATE_CLAIMED)
90 hw_led_state |= GPIO_GREEN_LED;
91 break;
92
93 case led_green_off:
94 if (led_state & LED_STATE_CLAIMED)
95 hw_led_state &= ~GPIO_GREEN_LED;
96 break;
97
98 case led_amber_on:
99 if (led_state & LED_STATE_CLAIMED)
100 hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
101 break;
102
103 case led_amber_off:
104 if (led_state & LED_STATE_CLAIMED)
105 hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
106 break;
107
108 case led_red_on:
109 if (led_state & LED_STATE_CLAIMED)
110 hw_led_state |= GPIO_RED_LED;
111 break;
112
113 case led_red_off:
114 if (led_state & LED_STATE_CLAIMED)
115 hw_led_state &= ~GPIO_RED_LED;
116 break;
117
118 default:
119 break;
120 }
121
122 spin_unlock_irqrestore(&leds_lock, flags);
123
124 if (led_state & LED_STATE_ENABLED) {
125 spin_lock_irqsave(&gpio_lock, flags);
126 gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
127 spin_unlock_irqrestore(&gpio_lock, flags);
128 }
129}
130
131static int __init leds_init(void)
132{
133 if (machine_is_netwinder())
134 leds_event = netwinder_leds_event;
135
136 leds_event(led_start);
137
138 return 0;
139}
140
141__initcall(leds_init);