1 /*
2  * linux/arch/arm/mach-omap1/leds-osk.c
3  *
4  * LED driver for OSK with optional Mistral QVGA board
5  */
6 #include <linux/init.h>
7 
8 #include <mach/hardware.h>
9 #include <asm/leds.h>
10 #include <asm/system.h>
11 
12 #include <mach/gpio.h>
13 
14 #include "leds.h"
15 
16 
17 #define LED_STATE_ENABLED	(1 << 0)
18 #define LED_STATE_CLAIMED	(1 << 1)
19 static u8 led_state;
20 
21 #define	TIMER_LED		(1 << 3)	/* Mistral board */
22 #define	IDLE_LED		(1 << 4)	/* Mistral board */
23 static u8 hw_led_state;
24 
25 
26 #ifdef	CONFIG_OMAP_OSK_MISTRAL
27 
28 /* For now, all system indicators require the Mistral board, since that
29  * LED can be manipulated without a task context.  This LED is either red,
30  * or green, but not both; it can't give the full "disco led" effect.
31  */
32 
33 #define GPIO_LED_RED		3
34 #define GPIO_LED_GREEN		OMAP_MPUIO(4)
35 
mistral_setled(void)36 static void mistral_setled(void)
37 {
38 	int	red = 0;
39 	int	green = 0;
40 
41 	if (hw_led_state & TIMER_LED)
42 		red = 1;
43 	else if (hw_led_state & IDLE_LED)
44 		green = 1;
45 	/* else both sides are disabled */
46 
47 	gpio_set_value(GPIO_LED_GREEN, green);
48 	gpio_set_value(GPIO_LED_RED, red);
49 }
50 
51 #endif
52 
osk_leds_event(led_event_t evt)53 void osk_leds_event(led_event_t evt)
54 {
55 	unsigned long	flags;
56 	u16		leds;
57 
58 	local_irq_save(flags);
59 
60 	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
61 		goto done;
62 
63 	leds = hw_led_state;
64 	switch (evt) {
65 	case led_start:
66 		led_state |= LED_STATE_ENABLED;
67 		hw_led_state = 0;
68 		leds = ~0;
69 		break;
70 
71 	case led_halted:
72 	case led_stop:
73 		led_state &= ~LED_STATE_ENABLED;
74 		hw_led_state = 0;
75 		break;
76 
77 	case led_claim:
78 		led_state |= LED_STATE_CLAIMED;
79 		hw_led_state = 0;
80 		leds = ~0;
81 		break;
82 
83 	case led_release:
84 		led_state &= ~LED_STATE_CLAIMED;
85 		hw_led_state = 0;
86 		break;
87 
88 #ifdef	CONFIG_OMAP_OSK_MISTRAL
89 
90 	case led_timer:
91 		hw_led_state ^= TIMER_LED;
92 		mistral_setled();
93 		break;
94 
95 	case led_idle_start:	/* idle == off */
96 		hw_led_state &= ~IDLE_LED;
97 		mistral_setled();
98 		break;
99 
100 	case led_idle_end:
101 		hw_led_state |= IDLE_LED;
102 		mistral_setled();
103 		break;
104 
105 #endif	/* CONFIG_OMAP_OSK_MISTRAL */
106 
107 	default:
108 		break;
109 	}
110 
111 	leds ^= hw_led_state;
112 
113 done:
114 	local_irq_restore(flags);
115 }
116