diff options
author | Andrew Victor <linux@maxim.org.za> | 2008-04-15 21:13:33 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-17 15:58:25 +0100 |
commit | fdb72fd84c26438a7dd754a1cc74890aca7f1b77 (patch) | |
tree | d3cfa375d72baf7fb4491eadb364428e8dfb56ab /arch | |
parent | 05dda977f2574c3341abef9b74c27d2b362e1e3a (diff) |
[ARM] 4981/1: [KS8695] Simple LED driver
Simple gpio-connected LED driver for KS8695 platforms.
(Based on old AT91 LED driver)
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/mach-ks8695/Makefile | 3 | ||||
-rw-r--r-- | arch/arm/mach-ks8695/devices.c | 21 | ||||
-rw-r--r-- | arch/arm/mach-ks8695/leds.c | 94 |
3 files changed, 118 insertions, 0 deletions
diff --git a/arch/arm/mach-ks8695/Makefile b/arch/arm/mach-ks8695/Makefile index 730a3af12c98..ade42b73afbb 100644 --- a/arch/arm/mach-ks8695/Makefile +++ b/arch/arm/mach-ks8695/Makefile @@ -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 diff --git a/arch/arm/mach-ks8695/devices.c b/arch/arm/mach-ks8695/devices.c index 386593f8ac65..3db2ec61d06f 100644 --- a/arch/arm/mach-ks8695/devices.c +++ b/arch/arm/mach-ks8695/devices.c @@ -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 + /* -------------------------------------------------------------------- */ /* diff --git a/arch/arm/mach-ks8695/leds.c b/arch/arm/mach-ks8695/leds.c new file mode 100644 index 000000000000..d61762ae50d8 --- /dev/null +++ b/arch/arm/mach-ks8695/leds.c @@ -0,0 +1,94 @@ +/* + * 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); |