MIPS: BCM47XX: Prepare support for LEDs

So far this is mostly just a proof of concept, database consists of a
single device. Creating a nice iterateable array wasn't an option
because devices have different amount of LEDs. And we don't want to
waste memory just because of support for a device with dozens on LEDs.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6299/

arch/mips/bcm47xx/Kconfig

@@ -12,6 +12,7 @@ config BCM47XX_SSB
 	select SSB_PCICORE_HOSTMODE if PCI
 	select SSB_DRIVER_GPIO
 	select GPIOLIB
+	select LEDS_GPIO_REGISTER
 	default y
 	help
 	 Add support for old Broadcom BCM47xx boards with Sonics Silicon Backplane support.
@@ -29,6 +30,7 @@ config BCM47XX_BCMA
 	select BCMA_DRIVER_PCI_HOSTMODE if PCI
 	select BCMA_DRIVER_GPIO
 	select GPIOLIB
+	select LEDS_GPIO_REGISTER
 	default y
 	help
 	 Add support for new Broadcom BCM47xx boards with Broadcom specific Advanced Microcontroller Bus.

arch/mips/bcm47xx/Makefile

@@ -4,5 +4,5 @@
 #
 
 obj-y				+= irq.o nvram.o prom.o serial.o setup.o time.o sprom.o
-obj-y				+= board.o
+obj-y				+= board.o leds.o
 obj-$(CONFIG_BCM47XX_SSB)	+= wgt634u.o

arch/mips/bcm47xx/bcm47xx_private.h

+#ifndef LINUX_BCM47XX_PRIVATE_H_
+#define LINUX_BCM47XX_PRIVATE_H_
+
+#include <linux/kernel.h>
+
+/* leds.c */
+void __init bcm47xx_leds_register(void);
+
+#endif

arch/mips/bcm47xx/leds.c

+#include "bcm47xx_private.h"
+
+#include <linux/leds.h>
+#include <bcm47xx_board.h>
+
+static const struct gpio_led
+bcm47xx_leds_netgear_wndr4500_v1_leds[] __initconst = {
+	{
+		.name		= "bcm47xx:green:wps",
+		.gpio		= 1,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:green:power",
+		.gpio		= 2,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:orange:power",
+		.gpio		= 3,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:green:usb1",
+		.gpio		= 8,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:green:2ghz",
+		.gpio		= 9,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:blue:5ghz",
+		.gpio		= 11,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+	{
+		.name		= "bcm47xx:green:usb2",
+		.gpio		= 14,
+		.active_low	= 1,
+		.default_state	= LEDS_GPIO_DEFSTATE_KEEP,
+	},
+};
+
+static struct gpio_led_platform_data bcm47xx_leds_pdata;
+
+#define bcm47xx_set_pdata(dev_leds) do {				\
+	bcm47xx_leds_pdata.leds = dev_leds;				\
+	bcm47xx_leds_pdata.num_leds = ARRAY_SIZE(dev_leds);		\
+} while (0)
+
+void __init bcm47xx_leds_register(void)
+{
+	enum bcm47xx_board board = bcm47xx_board_get();
+
+	switch (board) {
+	case BCM47XX_BOARD_NETGEAR_WNDR4500V1:
+		bcm47xx_set_pdata(bcm47xx_leds_netgear_wndr4500_v1_leds);
+		break;
+	default:
+		pr_debug("No LEDs configuration found for this device\n");
+		return;
+	}
+
+	gpio_led_register_device(-1, &bcm47xx_leds_pdata);
+}

arch/mips/bcm47xx/setup.c

@@ -26,6 +26,8 @@
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include "bcm47xx_private.h"
+
 #include <linux/export.h>
 #include <linux/types.h>
 #include <linux/ssb/ssb.h>
@@ -253,6 +255,8 @@ static int __init bcm47xx_register_bus_complete(void)
 		break;
 #endif
 	}
+	bcm47xx_leds_register();
+
 	return 0;
 }
 device_initcall(bcm47xx_register_bus_complete);