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1da177e4 LT |
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 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/spinlock.h> | |
23 | ||
a09e64fb | 24 | #include <mach/hardware.h> |
1da177e4 LT |
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 | |
31 | static char led_state; | |
32 | static char hw_led_state; | |
33 | ||
34 | static DEFINE_SPINLOCK(leds_lock); | |
35 | extern spinlock_t gpio_lock; | |
36 | ||
37 | static void netwinder_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 | led_state |= LED_STATE_ENABLED; | |
46 | hw_led_state = GPIO_GREEN_LED; | |
47 | break; | |
48 | ||
49 | case led_stop: | |
50 | led_state &= ~LED_STATE_ENABLED; | |
51 | break; | |
52 | ||
53 | case led_claim: | |
54 | led_state |= LED_STATE_CLAIMED; | |
55 | hw_led_state = 0; | |
56 | break; | |
57 | ||
58 | case led_release: | |
59 | led_state &= ~LED_STATE_CLAIMED; | |
60 | hw_led_state = 0; | |
61 | break; | |
62 | ||
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 | |
69 | ||
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; | |
75 | ||
76 | case led_idle_end: | |
77 | if (!(led_state & LED_STATE_CLAIMED)) | |
78 | hw_led_state |= GPIO_RED_LED; | |
79 | break; | |
80 | #endif | |
81 | ||
82 | case led_halted: | |
83 | if (!(led_state & LED_STATE_CLAIMED)) | |
84 | hw_led_state |= GPIO_RED_LED; | |
85 | break; | |
86 | ||
87 | case led_green_on: | |
88 | if (led_state & LED_STATE_CLAIMED) | |
89 | hw_led_state |= GPIO_GREEN_LED; | |
90 | break; | |
91 | ||
92 | case led_green_off: | |
93 | if (led_state & LED_STATE_CLAIMED) | |
94 | hw_led_state &= ~GPIO_GREEN_LED; | |
95 | break; | |
96 | ||
97 | case led_amber_on: | |
98 | if (led_state & LED_STATE_CLAIMED) | |
99 | hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED; | |
100 | break; | |
101 | ||
102 | case led_amber_off: | |
103 | if (led_state & LED_STATE_CLAIMED) | |
104 | hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED); | |
105 | break; | |
106 | ||
107 | case led_red_on: | |
108 | if (led_state & LED_STATE_CLAIMED) | |
109 | hw_led_state |= GPIO_RED_LED; | |
110 | break; | |
111 | ||
112 | case led_red_off: | |
113 | if (led_state & LED_STATE_CLAIMED) | |
114 | hw_led_state &= ~GPIO_RED_LED; | |
115 | break; | |
116 | ||
117 | default: | |
118 | break; | |
119 | } | |
120 | ||
121 | spin_unlock_irqrestore(&leds_lock, flags); | |
122 | ||
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); | |
127 | } | |
128 | } | |
129 | ||
130 | static int __init leds_init(void) | |
131 | { | |
132 | if (machine_is_netwinder()) | |
133 | leds_event = netwinder_leds_event; | |
134 | ||
135 | leds_event(led_start); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | __initcall(leds_init); |