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gerrit-public.fairphone.software / kernel / msm-4.19 / 2354eb5a943e64c5e6e249147381e9715aa5d54b / . / arch / arm / mach-footbridge / netwinder-leds.c
blob: 00269fe0be8a674c1f6464cdda5a4859737016af [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 */
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>
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]35
36static void netwinder_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 led_state |= LED_STATE_ENABLED;
45 hw_led_state = GPIO_GREEN_LED;
46 break;
47
48 case led_stop:
49 led_state &= ~LED_STATE_ENABLED;
50 break;
51
52 case led_claim:
53 led_state |= LED_STATE_CLAIMED;
54 hw_led_state = 0;
55 break;
56
57 case led_release:
58 led_state &= ~LED_STATE_CLAIMED;
59 hw_led_state = 0;
60 break;
61
62#ifdef CONFIG_LEDS_TIMER
63 case led_timer:
64 if (!(led_state & LED_STATE_CLAIMED))
65 hw_led_state ^= GPIO_GREEN_LED;
66 break;
67#endif
68
69#ifdef CONFIG_LEDS_CPU
70 case led_idle_start:
71 if (!(led_state & LED_STATE_CLAIMED))
72 hw_led_state &= ~GPIO_RED_LED;
73 break;
74
75 case led_idle_end:
76 if (!(led_state & LED_STATE_CLAIMED))
77 hw_led_state |= GPIO_RED_LED;
78 break;
79#endif
80
81 case led_halted:
82 if (!(led_state & LED_STATE_CLAIMED))
83 hw_led_state |= GPIO_RED_LED;
84 break;
85
86 case led_green_on:
87 if (led_state & LED_STATE_CLAIMED)
88 hw_led_state |= GPIO_GREEN_LED;
89 break;
90
91 case led_green_off:
92 if (led_state & LED_STATE_CLAIMED)
93 hw_led_state &= ~GPIO_GREEN_LED;
94 break;
95
96 case led_amber_on:
97 if (led_state & LED_STATE_CLAIMED)
98 hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
99 break;
100
101 case led_amber_off:
102 if (led_state & LED_STATE_CLAIMED)
103 hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
104 break;
105
106 case led_red_on:
107 if (led_state & LED_STATE_CLAIMED)
108 hw_led_state |= GPIO_RED_LED;
109 break;
110
111 case led_red_off:
112 if (led_state & LED_STATE_CLAIMED)
113 hw_led_state &= ~GPIO_RED_LED;
114 break;
115
116 default:
117 break;
118 }
119
120 spin_unlock_irqrestore(&leds_lock, flags);
121
122 if (led_state & LED_STATE_ENABLED) {
Russell King70d13e02008-12-06 08:25:16 +0000[diff] [blame]123 spin_lock_irqsave(&nw_gpio_lock, flags);
124 nw_gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
125 spin_unlock_irqrestore(&nw_gpio_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]126 }
127}
128
129static int __init leds_init(void)
130{
131 if (machine_is_netwinder())
132 leds_event = netwinder_leds_event;
133
134 leds_event(led_start);
135
136 return 0;
137}
138
139__initcall(leds_init);