[MIPS] GPIO LED driver for the WGT634U machine

Add LED support to the WGT634U machine.  It uses the new gpio-led
driver and a platform driver for the pin definitions.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/bcm47xx/Makefile

@@ -3,4 +3,4 @@
 # under Linux.
 #
 
-obj-y := gpio.o irq.o prom.o serial.o setup.o time.o
+obj-y := gpio.o irq.o prom.o serial.o setup.o time.o wgt634u.o

arch/mips/bcm47xx/wgt634u.c

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/leds.h>
+#include <linux/ssb/ssb.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+
+/* GPIO definitions for the WGT634U */
+#define WGT634U_GPIO_LED	3
+#define WGT634U_GPIO_RESET	2
+#define WGT634U_GPIO_TP1	7
+#define WGT634U_GPIO_TP2	6
+#define WGT634U_GPIO_TP3	5
+#define WGT634U_GPIO_TP4	4
+#define WGT634U_GPIO_TP5	1
+
+static struct gpio_led wgt634u_leds[] = {
+	{
+		.name = "power",
+		.gpio = WGT634U_GPIO_LED,
+		.active_low = 1,
+		.default_trigger = "heartbeat",
+	},
+};
+
+static struct gpio_led_platform_data wgt634u_led_data = {
+	.num_leds =     ARRAY_SIZE(wgt634u_leds),
+	.leds =         wgt634u_leds,
+};
+
+static struct platform_device wgt634u_gpio_leds = {
+	.name =         "leds-gpio",
+	.id =           -1,
+	.dev = {
+		.platform_data = &wgt634u_led_data,
+	}
+};
+
+static int __init wgt634u_init(void)
+{
+	/* There is no easy way to detect that we are running on a WGT634U
+	 * machine. Use the MAC address as an heuristic. Netgear Inc. has
+	 * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
+	 */
+
+	u8 *et0mac = ssb_bcm47xx.sprom.r1.et0mac;
+
+	if (et0mac[0] == 0x00 &&
+	    ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
+	     (et0mac[1] == 0x0f && et0mac[2] == 0xb5)))
+		return platform_device_register(&wgt634u_gpio_leds);
+	else
+		return -ENODEV;
+}
+
+module_init(wgt634u_init);
+