[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>

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);