Pull platform-drivers into test branch
[linux-2.6] / 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/init.h>
13
14 #include <asm/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_23    GPIO_GPIO23
28 #define LED_MASK  (LED_23)
29
30 void lart_leds_event(led_event_t evt)
31 {
32         unsigned long flags;
33
34         local_irq_save(flags);
35
36         switch(evt) {
37         case led_start:
38                 /* pin 23 is output pin */
39                 GPDR |= LED_23;
40                 hw_led_state = LED_MASK;
41                 led_state = LED_STATE_ENABLED;
42                 break;
43
44         case led_stop:
45                 led_state &= ~LED_STATE_ENABLED;
46                 break;
47
48         case led_claim:
49                 led_state |= LED_STATE_CLAIMED;
50                 hw_led_state = LED_MASK;
51                 break;
52
53         case led_release:
54                 led_state &= ~LED_STATE_CLAIMED;
55                 hw_led_state = LED_MASK;
56                 break;
57
58 #ifdef CONFIG_LEDS_TIMER
59         case led_timer:
60                 if (!(led_state & LED_STATE_CLAIMED))
61                         hw_led_state ^= LED_23;
62                 break;
63 #endif
64
65 #ifdef CONFIG_LEDS_CPU
66         case led_idle_start:
67                 /* The LART people like the LED to be off when the
68                    system is idle... */
69                 if (!(led_state & LED_STATE_CLAIMED))
70                         hw_led_state &= ~LED_23;
71                 break;
72
73         case led_idle_end:
74                 /* ... and on if the system is not idle */
75                 if (!(led_state & LED_STATE_CLAIMED))
76                         hw_led_state |= LED_23;
77                 break;
78 #endif
79
80         case led_red_on:
81                 if (led_state & LED_STATE_CLAIMED)
82                         hw_led_state &= ~LED_23;
83                 break;
84
85         case led_red_off:
86                 if (led_state & LED_STATE_CLAIMED)
87                         hw_led_state |= LED_23;
88                 break;
89
90         default:
91                 break;
92         }
93
94         /* Now set the GPIO state, or nothing will happen at all */
95         if (led_state & LED_STATE_ENABLED) {
96                 GPSR = hw_led_state;
97                 GPCR = hw_led_state ^ LED_MASK;
98         }
99
100         local_irq_restore(flags);
101 }