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