Merge branch 'next/soc-exynos5250-arch' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / arch / arm / mach-sa1100 / leds-hackkit.c
1 /*
2  * linux/arch/arm/mach-sa1100/leds-hackkit.c
3  *
4  * based on leds-lart.c
5  *
6  * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
7  * (C) Stefan Eletzhofer <stefan.eletzhofer@eletztrick.de>, 2002
8  *
9  * The HackKit has two leds (GPIO 22/23). The red led (gpio 22) is used
10  * as cpu led, the green one is used as timer led.
11  */
12 #include <linux/init.h>
13
14 #include <mach/hardware.h>
15 #include <asm/leds.h>
16 #include <asm/system.h>
17
18 #include "leds.h"
19
20
21 #define LED_STATE_ENABLED       1
22 #define LED_STATE_CLAIMED       2
23
24 static unsigned int led_state;
25 static unsigned int hw_led_state;
26
27 #define LED_GREEN    GPIO_GPIO23
28 #define LED_RED    GPIO_GPIO22
29 #define LED_MASK  (LED_RED | LED_GREEN)
30
31 void hackkit_leds_event(led_event_t evt)
32 {
33         unsigned long flags;
34
35         local_irq_save(flags);
36
37         switch(evt) {
38                 case led_start:
39                         /* pin 22/23 are outputs */
40                         GPDR |= LED_MASK;
41                         hw_led_state = LED_MASK;
42                         led_state = LED_STATE_ENABLED;
43                         break;
44
45                 case led_stop:
46                         led_state &= ~LED_STATE_ENABLED;
47                         break;
48
49                 case led_claim:
50                         led_state |= LED_STATE_CLAIMED;
51                         hw_led_state = LED_MASK;
52                         break;
53
54                 case led_release:
55                         led_state &= ~LED_STATE_CLAIMED;
56                         hw_led_state = LED_MASK;
57                         break;
58
59 #ifdef CONFIG_LEDS_TIMER
60                 case led_timer:
61                         if (!(led_state & LED_STATE_CLAIMED))
62                                 hw_led_state ^= LED_GREEN;
63                         break;
64 #endif
65
66 #ifdef CONFIG_LEDS_CPU
67                 case led_idle_start:
68                         /* The LART people like the LED to be off when the
69                            system is idle... */
70                         if (!(led_state & LED_STATE_CLAIMED))
71                                 hw_led_state &= ~LED_RED;
72                         break;
73
74                 case led_idle_end:
75                         /* ... and on if the system is not idle */
76                         if (!(led_state & LED_STATE_CLAIMED))
77                                 hw_led_state |= LED_RED;
78                         break;
79 #endif
80
81                 case led_red_on:
82                         if (led_state & LED_STATE_CLAIMED)
83                                 hw_led_state &= ~LED_RED;
84                         break;
85
86                 case led_red_off:
87                         if (led_state & LED_STATE_CLAIMED)
88                                 hw_led_state |= LED_RED;
89                         break;
90
91                 case led_green_on:
92                         if (led_state & LED_STATE_CLAIMED)
93                                 hw_led_state &= ~LED_GREEN;
94                         break;
95
96                 case led_green_off:
97                         if (led_state & LED_STATE_CLAIMED)
98                                 hw_led_state |= LED_GREEN;
99                         break;
100
101                 default:
102                         break;
103         }
104
105         /* Now set the GPIO state, or nothing will happen at all */
106         if (led_state & LED_STATE_ENABLED) {
107                 GPSR = hw_led_state;
108                 GPCR = hw_led_state ^ LED_MASK;
109         }
110
111         local_irq_restore(flags);
112 }