misc: add gpio based status led driver

This patch adds a status led driver followed the GPIO access
conventions of Linux. The led mask is used to specify the gpio pin.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Tested-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>

drivers/misc/Makefile

@@ -28,6 +28,7 @@ LIB	:= $(obj)libmisc.a
 COBJS-$(CONFIG_ALI152X) += ali512x.o
 COBJS-$(CONFIG_DS4510)  += ds4510.o
 COBJS-$(CONFIG_FSL_LAW) += fsl_law.o
+COBJS-$(CONFIG_GPIO_LED) += gpio_led.o
 COBJS-$(CONFIG_NS87308) += ns87308.o
 COBJS-$(CONFIG_STATUS_LED) += status_led.o
 COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o

drivers/misc/gpio_led.c

@@ -0,0 +1,30 @@
+/*
+ * Status LED driver based on GPIO access conventions of Linux
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * 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 <common.h>
+#include <status_led.h>
+#include <asm/gpio.h>
+
+/* assume led is active low */
+
+void __led_init(led_id_t mask, int state)
+{
+	gpio_direction_output(mask, (state == STATUS_LED_ON) ? 0 : 1);
+}
+
+void __led_set(led_id_t mask, int state)
+{
+	gpio_set_value(mask, (state == STATUS_LED_ON) ? 0 : 1);
+}
+
+void __led_toggle(led_id_t mask)
+{
+	gpio_set_value(mask, !gpio_get_value(mask));
+}