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 
hackkit_leds_event(led_event_t evt)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 }
113