v2.4.8 -> v2.4.8.1
[opensuse:kernel.git] / arch / arm / mach-sa1100 / leds-lart.c
1 /*
2  * linux/arch/arm/mach-sa1100/leds-lart.c
3  *
4  * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000
5  *
6  * LART uses the LED as follows:
7  *   - GPIO23 is the LED, on if system is not idle
8  *  You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same
9  *  time, but in that case the timer events will still dictate the
10  *  pace of the LED.
11  */
12 #include <linux/config.h>
13 #include <linux/init.h>
14
15 #include <asm/hardware.h>
16 #include <asm/leds.h>
17 #include <asm/system.h>
18
19 #include "leds.h"
20
21
22 #define LED_STATE_ENABLED       1
23 #define LED_STATE_CLAIMED       2
24
25 static unsigned int led_state;
26 static unsigned int hw_led_state;
27
28 #define LED_23    GPIO_GPIO23
29 #define LED_MASK  (LED_23)
30
31 void lart_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 23 is output pin */
40                 GPDR |= LED_23;
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_23;
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_23;
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_23;
78                 break;
79 #endif
80
81         case led_red_on:
82                 if (led_state & LED_STATE_CLAIMED)
83                         hw_led_state &= ~LED_23;
84                 break;
85
86         case led_red_off:
87                 if (led_state & LED_STATE_CLAIMED)
88                         hw_led_state |= LED_23;
89                 break;
90
91         default:
92                 break;
93         }
94
95         /* Now set the GPIO state, or nothing will happen at all */
96         if (led_state & LED_STATE_ENABLED) {
97                 GPSR = hw_led_state;
98                 GPCR = hw_led_state ^ LED_MASK;
99         }
100
101         local_irq_restore(flags);
102 }