[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>

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);