[PATCH] LED Class support for Soekris net48xx

Add 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.

[akpm@osdl.org: fixlets, cleanups]
Signed-off-by: Chris Boot <bootc@bootc.net>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 128 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 196a31c97524..c55f690d4030 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 96509989e921..9c39b98d5a5b 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 88d3b6eaa6a2..6aa2aed7539d 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_LEDS_IXP4XX)		+= leds-ixp4xx-gpio.o
 obj-$(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 000000000000..35ee52f9b79e
--- /dev/null
+++ b/drivers/leds/leds-net48xx.c
@@ -0,0 +1,115 @@
+/*
+ * 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)
+{
+        led_classdev_suspend(&net48xx_error_led);
+        return 0;
+}
+
+static int net48xx_led_resume(struct platform_device *dev)
+{
+        led_classdev_resume(&net48xx_error_led);
+        return 0;
+}
+#else
+#define net48xx_led_suspend NULL
+#define net48xx_led_resume NULL
+#endif
+
+static int net48xx_led_probe(struct platform_device *pdev)
+{
+        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 = {
+        .driver.owner   = THIS_MODULE,
+        .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");
+