[RFC][PATCH] LED Class support for Soekris net48xx

[Chris Boot <bootc@bootc.net>]

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Hi all,

After many years using Linux and hanging about on LKML without having done much 
actual kernel hacking, I've decided to have a go! The module below adds LED 
Class device support for the Soekris net48xx Error LED. Tested only on a 
net4801, but should work on a net4826 as well. I'd love to find a way of 
detecting a Soekris net48xx device but there is no DMI or any Soekris-specific 
PCI devices.

The patch is attached because Thunderbird kills tabs.

-- 
Chris Boot
bootc@bootc.net
http://www.bootc.net/

[-- Attachment #2: leds-net48xx.patch --]
[-- Type: text/x-patch, Size: 4118 bytes --]

diff --git a/MAINTAINERS b/MAINTAINERS
index 196a31c..c55f690 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2666,6 +2666,11 @@ M:	shemminger@osdl.org
 L:	netdev@vger.kernel.org
 S:	Maintained
 
+SOEKRIS NET48XX LED SUPPORT
+P:	Chris Boot
+M:	bootc@bootc.net
+S:	Maintained
+
 SPARC (sparc32):
 P:	William L. Irwin
 M:	wli@holomorphy.com
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 9650998..9c39b98 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -69,6 +69,13 @@ config LEDS_AMS_DELTA
 	help
 	  This option enables support for the LEDs on Amstrad Delta (E3).
 
+config LEDS_NET48XX
+	tristate "LED Support for Soekris net48xx series Error LED"
+	depends on LEDS_CLASS && SCx200_GPIO
+	help
+	  This option enables support for the Soekris net4801 and net4826 error
+	  LED.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 88d3b6e..6aa2aed 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_LEDS_IXP4XX)		+= leds-ixp4x
 obj-$(CONFIG_LEDS_TOSA)			+= leds-tosa.o
 obj-$(CONFIG_LEDS_S3C24XX)		+= leds-s3c24xx.o
 obj-$(CONFIG_LEDS_AMS_DELTA)		+= leds-ams-delta.o
+obj-$(CONFIG_LEDS_NET48XX)		+= leds-net48xx.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
diff --git a/drivers/leds/leds-net48xx.c b/drivers/leds/leds-net48xx.c
new file mode 100644
index 0000000..157b561
--- /dev/null
+++ b/drivers/leds/leds-net48xx.c
@@ -0,0 +1,116 @@
+/*
+ * LEDs driver for Soekris net48xx
+ *
+ * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
+ *
+ * Based on leds-ams-delta.c
+ *
+ * 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 <linux/err.h>
+#include <asm/io.h>
+#include <linux/scx200_gpio.h>
+
+#define NET48XX_ERROR_LED_GPIO	20
+
+static struct platform_device *pdev;
+
+static void net48xx_error_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	if (value)
+		scx200_gpio_set_high(NET48XX_ERROR_LED_GPIO);
+	else
+		scx200_gpio_set_low(NET48XX_ERROR_LED_GPIO);
+}
+
+static struct led_classdev net48xx_error_led = {
+	.name		= "net48xx:error",
+	.brightness_set	= net48xx_error_led_set,
+};
+
+#ifdef CONFIG_PM
+static int net48xx_led_suspend(struct platform_device *dev,
+		pm_message_t state)
+{
+	return led_classdev_suspend(&net48xx_error_led);
+}
+
+static int net48xx_led_resume(struct platform_device *dev)
+{
+	return led_classdev_resume(&net48xx_error_led);
+}
+#else
+#define net48xx_led_suspend NULL
+#define net48xx_led_resume NULL
+#endif
+
+static int net48xx_led_probe(struct platform_device *pdev)
+{
+	if (!scx200_gpio_present())
+		return ENODEV;
+	
+	return led_classdev_register(&pdev->dev,
+		&net48xx_error_led);
+}
+
+static int net48xx_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&net48xx_error_led);
+	return 0;
+}
+
+static struct platform_driver net48xx_led_driver = {
+	.probe		= net48xx_led_probe,
+	.remove		= net48xx_led_remove,
+	.suspend	= net48xx_led_suspend,
+	.resume		= net48xx_led_resume,
+	.driver		= {
+		.name = "net48xx-led",
+	},
+};
+
+static int __init net48xx_led_init(void)
+{
+	int ret;
+	
+	if (!scx200_gpio_present()) {
+		ret = ENODEV;
+		goto out;
+	}
+	
+	ret = platform_driver_register(&net48xx_led_driver);
+	if (ret < 0)
+		goto out;
+	
+	pdev = platform_device_register_simple("net48xx-led", -1, NULL, 0);
+	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
+		platform_driver_unregister(&net48xx_led_driver);
+		goto out;
+	}
+	
+out:
+	return ret;
+}
+
+static void __exit net48xx_led_exit(void)
+{
+	platform_device_unregister(pdev);
+	platform_driver_unregister(&net48xx_led_driver);
+}
+
+module_init(net48xx_led_init);
+module_exit(net48xx_led_exit);
+
+MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
+MODULE_DESCRIPTION("Soekris net48xx LED driver");
+MODULE_LICENSE("GPL");
+