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gerrit-public.fairphone.software / kernel / msm-4.9 / f8a745942b1b7f052cb76bb8a893d12cb6329c84 / . / arch / arm / mach-shark / leds.c
blob: 5386a81f796a07a9bbbd5eb89e9c7e24daba88d0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +0200[diff] [blame]2 * arch/arm/mach-shark/leds.c
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]3 * by Alexander Schulz
4 *
5 * derived from:
6 * arch/arm/kernel/leds-footbridge.c
7 * Copyright (C) 1998-1999 Russell King
8 *
9 * DIGITAL Shark LED control routines.
10 *
11 * The leds use is as follows:
12 * - Green front - toggles state every 50 timer interrupts
13 * - Amber front - Unused, this is a dual color led (Amber/Green)
14 * - Amber back - On if system is not idle
15 *
16 * Changelog:
17 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/spinlock.h>
22#include <linux/ioport.h>
23
24#include <asm/hardware.h>
25#include <asm/leds.h>
26#include <asm/io.h>
27#include <asm/system.h>
28
29#define LED_STATE_ENABLED 1
30#define LED_STATE_CLAIMED 2
31static char led_state;
32static short hw_led_state;
33static short saved_state;
34
35static DEFINE_SPINLOCK(leds_lock);
36
37short sequoia_read(int addr) {
38 outw(addr,0x24);
39 return inw(0x26);
40}
41
42void sequoia_write(short value,short addr) {
43 outw(addr,0x24);
44 outw(value,0x26);
45}
46
47static void sequoia_leds_event(led_event_t evt)
48{
49 unsigned long flags;
50
51 spin_lock_irqsave(&leds_lock, flags);
52
53 hw_led_state = sequoia_read(0x09);
54
55 switch (evt) {
56 case led_start:
57 hw_led_state |= SEQUOIA_LED_GREEN;
58 hw_led_state |= SEQUOIA_LED_AMBER;
59#ifdef CONFIG_LEDS_CPU
60 hw_led_state |= SEQUOIA_LED_BACK;
61#else
62 hw_led_state &= ~SEQUOIA_LED_BACK;
63#endif
64 led_state |= LED_STATE_ENABLED;
65 break;
66
67 case led_stop:
68 hw_led_state &= ~SEQUOIA_LED_BACK;
69 hw_led_state |= SEQUOIA_LED_GREEN;
70 hw_led_state |= SEQUOIA_LED_AMBER;
71 led_state &= ~LED_STATE_ENABLED;
72 break;
73
74 case led_claim:
75 led_state |= LED_STATE_CLAIMED;
76 saved_state = hw_led_state;
77 hw_led_state &= ~SEQUOIA_LED_BACK;
78 hw_led_state |= SEQUOIA_LED_GREEN;
79 hw_led_state |= SEQUOIA_LED_AMBER;
80 break;
81
82 case led_release:
83 led_state &= ~LED_STATE_CLAIMED;
84 hw_led_state = saved_state;
85 break;
86
87#ifdef CONFIG_LEDS_TIMER
88 case led_timer:
89 if (!(led_state & LED_STATE_CLAIMED))
90 hw_led_state ^= SEQUOIA_LED_GREEN;
91 break;
92#endif
93
94#ifdef CONFIG_LEDS_CPU
95 case led_idle_start:
96 if (!(led_state & LED_STATE_CLAIMED))
97 hw_led_state &= ~SEQUOIA_LED_BACK;
98 break;
99
100 case led_idle_end:
101 if (!(led_state & LED_STATE_CLAIMED))
102 hw_led_state |= SEQUOIA_LED_BACK;
103 break;
104#endif
105
106 case led_green_on:
107 if (led_state & LED_STATE_CLAIMED)
108 hw_led_state &= ~SEQUOIA_LED_GREEN;
109 break;
110
111 case led_green_off:
112 if (led_state & LED_STATE_CLAIMED)
113 hw_led_state |= SEQUOIA_LED_GREEN;
114 break;
115
116 case led_amber_on:
117 if (led_state & LED_STATE_CLAIMED)
118 hw_led_state &= ~SEQUOIA_LED_AMBER;
119 break;
120
121 case led_amber_off:
122 if (led_state & LED_STATE_CLAIMED)
123 hw_led_state |= SEQUOIA_LED_AMBER;
124 break;
125
126 case led_red_on:
127 if (led_state & LED_STATE_CLAIMED)
128 hw_led_state |= SEQUOIA_LED_BACK;
129 break;
130
131 case led_red_off:
132 if (led_state & LED_STATE_CLAIMED)
133 hw_led_state &= ~SEQUOIA_LED_BACK;
134 break;
135
136 default:
137 break;
138 }
139
140 if (led_state & LED_STATE_ENABLED)
141 sequoia_write(hw_led_state,0x09);
142
143 spin_unlock_irqrestore(&leds_lock, flags);
144}
145
146static int __init leds_init(void)
147{
148 extern void (*leds_event)(led_event_t);
149 short temp;
150
151 leds_event = sequoia_leds_event;
152
153 /* Make LEDs independent of power-state */
154 request_region(0x24,4,"sequoia");
155 temp = sequoia_read(0x09);
156 temp |= 1<<10;
157 sequoia_write(temp,0x09);
158 leds_event(led_start);
159 return 0;
160}
161
162__initcall(leds_init);