MIPS: ath79: add common GPIO LEDs device

Almost all boards have one or more LEDs connected to GPIO lines. This
patch adds common code to register a platform_device for them.

The patch also adds support for the LEDs on the PB44 board.

Signed-off-by: Gabor Juhos <[e-mail]>
Signed-off-by: Imre Kaloz <[e-mail]>
Cc: [e-mail]
Cc: Luis R. Rodriguez <[e-mail]>
Cc: Cliff Holden <[e-mail]>
Cc: Kathy Giori <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/1953/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/ath79/Kconfig

···
 config ATH79_MACH_PB44
 	bool "Atheros PB44 reference board"
 	select SOC_AR71XX
+	select ATH79_DEV_LEDS_GPIO
 	help
 	  Say 'Y' here if you want your kernel to support the
 	  Atheros PB44 reference board.
···
 	def_bool n
 
 config SOC_AR913X
+	def_bool n
+
+config ATH79_DEV_LEDS_GPIO
 	def_bool n
 
 endif

arch/mips/ath79/Makefile

···
 # Devices
 #
 obj-y					+= dev-common.o
+obj-$(CONFIG_ATH79_DEV_LEDS_GPIO)	+= dev-leds-gpio.o
 
 #
 # Machines

arch/mips/ath79/dev-leds-gpio.c

···
+/*
+ *  Atheros AR71XX/AR724X/AR913X common GPIO LEDs support
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <[e-mail]>
+ *  Copyright (C) 2008 Imre Kaloz <[e-mail]>
+ *
+ *  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/init.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+
+#include "dev-leds-gpio.h"
+
+void __init ath79_register_leds_gpio(int id,
+				     unsigned num_leds,
+				     struct gpio_led *leds)
+{
+	struct platform_device *pdev;
+	struct gpio_led_platform_data pdata;
+	struct gpio_led *p;
+	int err;
+
+	p = kmalloc(num_leds * sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return;
+
+	memcpy(p, leds, num_leds * sizeof(*p));
+
+	pdev = platform_device_alloc("leds-gpio", id);
+	if (!pdev)
+		goto err_free_leds;
+
+	memset(&pdata, 0, sizeof(pdata));
+	pdata.num_leds = num_leds;
+	pdata.leds = p;
+
+	err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
+	if (err)
+		goto err_put_pdev;
+
+	err = platform_device_add(pdev);
+	if (err)
+		goto err_put_pdev;
+
+	return;
+
+err_put_pdev:
+	platform_device_put(pdev);
+
+err_free_leds:
+	kfree(p);
+}

arch/mips/ath79/dev-leds-gpio.h

···
+/*
+ *  Atheros AR71XX/AR724X/AR913X common GPIO LEDs support
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <[e-mail]>
+ *  Copyright (C) 2008 Imre Kaloz <[e-mail]>
+ *
+ *  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.
+ */
+
+#ifndef _ATH79_DEV_LEDS_GPIO_H
+#define _ATH79_DEV_LEDS_GPIO_H
+
+#include <linux/leds.h>
+
+void ath79_register_leds_gpio(int id,
+			      unsigned num_leds,
+			      struct gpio_led *leds);
+
+#endif /* _ATH79_DEV_LEDS_GPIO_H */

arch/mips/ath79/mach-pb44.c

···
 #include <linux/i2c/pcf857x.h>
 
 #include "machtypes.h"
+#include "dev-leds-gpio.h"
 
 #define PB44_GPIO_I2C_SCL	0
 #define PB44_GPIO_I2C_SDA	1
 
 #define PB44_GPIO_EXP_BASE	16
+#define PB44_GPIO_LED_JUMP1	(PB44_GPIO_EXP_BASE + 9)
+#define PB44_GPIO_LED_JUMP2	(PB44_GPIO_EXP_BASE + 10)
 
 static struct i2c_gpio_platform_data pb44_i2c_gpio_data = {
 	.sda_pin        = PB44_GPIO_I2C_SDA,
···
 	},
 };
 
+static struct gpio_led pb44_leds_gpio[] __initdata = {
+	{
+		.name		= "pb44:amber:jump1",
+		.gpio		= PB44_GPIO_LED_JUMP1,
+		.active_low	= 1,
+	}, {
+		.name		= "pb44:green:jump2",
+		.gpio		= PB44_GPIO_LED_JUMP2,
+		.active_low	= 1,
+	},
+};
+
 static void __init pb44_init(void)
 {
 	i2c_register_board_info(0, pb44_i2c_board_info,
 				ARRAY_SIZE(pb44_i2c_board_info));
 	platform_device_register(&pb44_i2c_gpio_device);
+
+	ath79_register_leds_gpio(-1, ARRAY_SIZE(pb44_leds_gpio),
+				 pb44_leds_gpio);
 }
 
 MIPS_MACHINE(ATH79_MACH_PB44, "PB44", "Atheros PB44 reference board",