summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-ks8695/leds.c
diff options
context:
space:
mode:
authorAndrew Victor <linux@maxim.org.za>2008-04-15 21:13:33 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-17 15:58:25 +0100
commitfdb72fd84c26438a7dd754a1cc74890aca7f1b77 (patch)
treed3cfa375d72baf7fb4491eadb364428e8dfb56ab /arch/arm/mach-ks8695/leds.c
parent05dda977f2574c3341abef9b74c27d2b362e1e3a (diff)
downloadop-kernel-dev-fdb72fd84c26438a7dd754a1cc74890aca7f1b77.zip
op-kernel-dev-fdb72fd84c26438a7dd754a1cc74890aca7f1b77.tar.gz
[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/arm/mach-ks8695/leds.c')
-rw-r--r--arch/arm/mach-ks8695/leds.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/mach-ks8695/leds.c b/arch/arm/mach-ks8695/leds.c
new file mode 100644
index 0000000..d61762a
--- /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);
OpenPOWER on IntegriCloud