Commit fdb72fd8 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
Browse files

[ARM] 4981/1: [KS8695] Simple LED driver 



Simple gpio-connected LED driver for KS8695 platforms.
(Based on old AT91 LED driver)

Signed-off-by: default avatarAndrew Victor <linux@maxim.org.za>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 05dda977

arch/arm/mach-ks8695/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -11,5 +11,8 @@ obj- := 
# PCI support is optional

obj-$(CONFIG_PCI)		+= pci.o



# LEDs

obj-$(CONFIG_LEDS)		+= leds.o



# Board-specific support

obj-$(CONFIG_MACH_KS8695)	+= board-micrel.o

arch/arm/mach-ks8695/devices.c

+21 −0
Original line number Diff line number Diff line
@@ -176,6 +176,27 @@ static void __init ks8695_add_device_watchdog(void) {} 
#endif





/* --------------------------------------------------------------------

 *  LEDs

 * -------------------------------------------------------------------- */



#if defined(CONFIG_LEDS)

short ks8695_leds_cpu = -1;

short ks8695_leds_timer = -1;



void __init ks8695_init_leds(u8 cpu_led, u8 timer_led)

{

	/* Enable GPIO to access the LEDs */

	gpio_direction_output(cpu_led, 1);

	gpio_direction_output(timer_led, 1);



	ks8695_leds_cpu   = cpu_led;

	ks8695_leds_timer = timer_led;

}

#else

void __init ks8695_init_leds(u8 cpu_led, u8 timer_led) {}

#endif



/* -------------------------------------------------------------------- */



/*

arch/arm/mach-ks8695/leds.c

0 → 100644
+94 −0
Original line number Diff line number Diff line 
/*

 * LED driver for KS8695-based boards.

 *

 * Copyright (C) Andrew Victor

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>



#include <asm/mach-types.h>

#include <asm/leds.h>

#include <asm/arch/devices.h>

#include <asm/arch/gpio.h>





static inline void ks8695_led_on(unsigned int led)

{

	gpio_set_value(led, 0);

}



static inline void ks8695_led_off(unsigned int led)

{

	gpio_set_value(led, 1);

}



static inline void ks8695_led_toggle(unsigned int led)

{

	unsigned long is_off = gpio_get_value(led);

	if (is_off)

		ks8695_led_on(led);

	else

		ks8695_led_off(led);

}





/*

 * Handle LED events.

 */

static void ks8695_leds_event(led_event_t evt)

{

	unsigned long flags;



	local_irq_save(flags);



	switch(evt) {

	case led_start:		/* System startup */

		ks8695_led_on(ks8695_leds_cpu);

		break;



	case led_stop:		/* System stop / suspend */

		ks8695_led_off(ks8695_leds_cpu);

		break;



#ifdef CONFIG_LEDS_TIMER

	case led_timer:		/* Every 50 timer ticks */

		ks8695_led_toggle(ks8695_leds_timer);

		break;

#endif



#ifdef CONFIG_LEDS_CPU

	case led_idle_start:	/* Entering idle state */

		ks8695_led_off(ks8695_leds_cpu);

		break;



	case led_idle_end:	/* Exit idle state */

		ks8695_led_on(ks8695_leds_cpu);

		break;

#endif



	default:

		break;

	}



	local_irq_restore(flags);

}





static int __init leds_init(void)

{

	if ((ks8695_leds_timer == -1) || (ks8695_leds_cpu == -1))

		return -ENODEV;



	leds_event = ks8695_leds_event;



	leds_event(led_start);

	return 0;

}



__initcall(leds_init);

include/asm-arm/arch-ks8695/devices.h

+5 −0
Original line number Diff line number Diff line
@@ -18,6 +18,11 @@ extern void __init ks8695_add_device_wan(void); 
extern void __init ks8695_add_device_lan(void);

extern void __init ks8695_add_device_hpna(void);



 /* LEDs */

extern short ks8695_leds_cpu;

extern short ks8695_leds_timer;

extern void __init ks8695_init_leds(u8 cpu_led, u8 timer_led);



 /* PCI */

#define KS8695_MODE_PCI		0

#define KS8695_MODE_MINIPCI	1