leds: Add new driver for the LEDs on the Freecom FSG-3

The LEDs on the Freecom FSG-3 are connected to an external
memory-mapped latch on the ixp4xx expansion bus, and therefore cannot
be supported by any of the existing LEDs drivers.
Signed-off-by: Rod Whitby <rod@whitby.id.au>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

drivers/leds/Kconfig

@@ -65,6 +65,12 @@ config LEDS_NET48XX
 	  This option enables support for the Soekris net4801 and net4826 error
 	  LED.
 
+config LEDS_FSG
+	tristate "LED Support for the Freecom FSG-3"
+	depends on LEDS_CLASS && MACH_FSG
+	help
+	  This option enables support for the LEDs on the Freecom FSG-3.
+
 config LEDS_WRAP
 	tristate "LED Support for the WRAP series LEDs"
 	depends on LEDS_CLASS && SCx200_GPIO

drivers/leds/Makefile

@@ -20,6 +20,7 @@ obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
 obj-$(CONFIG_LEDS_CM_X270)              += leds-cm-x270.o
 obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
 obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
+obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o

drivers/leds/leds-fsg.c

+/*
+ * LED Driver for the Freecom FSG-3
+ *
+ * Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
+ *
+ * Author: Rod Whitby <rod@whitby.id.au>
+ *
+ * Based on leds-spitz.c
+ * Copyright 2005-2006 Openedhand Ltd.
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+
+static short __iomem *latch_address;
+static unsigned short latch_value;
+
+
+static void fsg_led_wlan_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_WLAN_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_WLAN_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_wan_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_WAN_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_WAN_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_sata_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_SATA_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_SATA_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_usb_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_USB_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_USB_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_sync_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_SYNC_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_SYNC_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_ring_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_RING_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_RING_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+
+
+static struct led_classdev fsg_wlan_led = {
+	.name			= "fsg:blue:wlan",
+	.brightness_set		= fsg_led_wlan_set,
+};
+
+static struct led_classdev fsg_wan_led = {
+	.name			= "fsg:blue:wan",
+	.brightness_set		= fsg_led_wan_set,
+};
+
+static struct led_classdev fsg_sata_led = {
+	.name			= "fsg:blue:sata",
+	.brightness_set		= fsg_led_sata_set,
+};
+
+static struct led_classdev fsg_usb_led = {
+	.name			= "fsg:blue:usb",
+	.brightness_set		= fsg_led_usb_set,
+};
+
+static struct led_classdev fsg_sync_led = {
+	.name			= "fsg:blue:sync",
+	.brightness_set		= fsg_led_sync_set,
+};
+
+static struct led_classdev fsg_ring_led = {
+	.name			= "fsg:blue:ring",
+	.brightness_set		= fsg_led_ring_set,
+};
+
+
+
+#ifdef CONFIG_PM
+static int fsg_led_suspend(struct platform_device *dev, pm_message_t state)
+{
+	led_classdev_suspend(&fsg_wlan_led);
+	led_classdev_suspend(&fsg_wan_led);
+	led_classdev_suspend(&fsg_sata_led);
+	led_classdev_suspend(&fsg_usb_led);
+	led_classdev_suspend(&fsg_sync_led);
+	led_classdev_suspend(&fsg_ring_led);
+	return 0;
+}
+
+static int fsg_led_resume(struct platform_device *dev)
+{
+	led_classdev_resume(&fsg_wlan_led);
+	led_classdev_resume(&fsg_wan_led);
+	led_classdev_resume(&fsg_sata_led);
+	led_classdev_resume(&fsg_usb_led);
+	led_classdev_resume(&fsg_sync_led);
+	led_classdev_resume(&fsg_ring_led);
+	return 0;
+}
+#endif
+
+
+static int fsg_led_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
+	if (ret < 0)
+		goto failwlan;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
+	if (ret < 0)
+		goto failwan;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
+	if (ret < 0)
+		goto failsata;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
+	if (ret < 0)
+		goto failusb;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
+	if (ret < 0)
+		goto failsync;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
+	if (ret < 0)
+		goto failring;
+
+	/* Map the LED chip select address space */
+	latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
+	if (!latch_address) {
+		ret = -ENOMEM;
+		goto failremap;
+	}
+
+	latch_value = 0xffff;
+	*latch_address = latch_value;
+
+	return ret;
+
+ failremap:
+	led_classdev_unregister(&fsg_ring_led);
+ failring:
+	led_classdev_unregister(&fsg_sync_led);
+ failsync:
+	led_classdev_unregister(&fsg_usb_led);
+ failusb:
+	led_classdev_unregister(&fsg_sata_led);
+ failsata:
+	led_classdev_unregister(&fsg_wan_led);
+ failwan:
+	led_classdev_unregister(&fsg_wlan_led);
+ failwlan:
+
+	return ret;
+}
+
+static int fsg_led_remove(struct platform_device *pdev)
+{
+	iounmap(latch_address);
+
+	led_classdev_unregister(&fsg_wlan_led);
+	led_classdev_unregister(&fsg_wan_led);
+	led_classdev_unregister(&fsg_sata_led);
+	led_classdev_unregister(&fsg_usb_led);
+	led_classdev_unregister(&fsg_sync_led);
+	led_classdev_unregister(&fsg_ring_led);
+
+	return 0;
+}
+
+
+static struct platform_driver fsg_led_driver = {
+	.probe		= fsg_led_probe,
+	.remove		= fsg_led_remove,
+#ifdef CONFIG_PM
+	.suspend	= fsg_led_suspend,
+	.resume		= fsg_led_resume,
+#endif
+	.driver		= {
+		.name		= "fsg-led",
+	},
+};
+
+
+static int __init fsg_led_init(void)
+{
+	return platform_driver_register(&fsg_led_driver);
+}
+
+static void __exit fsg_led_exit(void)
+{
+	platform_driver_unregister(&fsg_led_driver);
+}
+
+
+module_init(fsg_led_init);
+module_exit(fsg_led_exit);
+
+MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
+MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
+MODULE_LICENSE("GPL");