Disable all LEDs and network LEDs on Raspberry Pi 2 with OpenELEC

I’m using OpenELEC on a Raspberry Pi 2, but the LEDs, especially those of the network device, are WAY too bright and keep distracting people when watching TV. The LEDs which are onboard of the RPi2 can be disabled with two simple commands (see below), but the network lights are much brighter and can’t be disabled by default.

I found a website which was written in portoguese, which offered a patch for this problem. The patch didn’t work with the current OpenELEC-release, so I had to modify it a bit.

Simply put, the patch adds a new functionality to the driver for the network interface smsc95xx.c, by creating three sysfs-entries.

Here is the modified patch, to apply it, you have to git clone the current OpenELEC-github-Repository and copy the patch to this directory: /OpenELEC.tv/packages/linux/patches/

File linux-999-disable-network-lights.patch:

--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -74,6 +74,8 @@
 module_param(turbo_mode, bool, 0644);
 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
 
+int smsc95xx_ledctl(struct usbnet *dev);
+
 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
                                            u32 *data, int in_pm)
 {
@@ -1024,6 +1026,9 @@
        if (ret < 0)
                return ret;
 
+       // Init sysfs led controller
+       smsc95xx_ledctl(dev);
+
        /* Init Tx */
        ret = smsc95xx_write_reg(dev, FLOW, 0);
        if (ret < 0)
@@ -2023,3 +2028,87 @@
 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
 MODULE_LICENSE("GPL");
+
+/*
+ * Led control patch
+ */
+
+static struct usbnet *leddev = NULL;
+
+static ssize_t smsc95xx_store(struct class *cls, struct class_attribute *attr, const char *buf, size_t count);
+static ssize_t smsc95xx_show(struct class *cls, struct class_attribute *attr, char *buf);
+
+static CLASS_ATTR(eth_fdx,S_IWUSR, smsc95xx_show, smsc95xx_store);
+static CLASS_ATTR(eth_lnk,S_IWUSR, smsc95xx_show, smsc95xx_store);
+static CLASS_ATTR(eth_spd,S_IWUSR, smsc95xx_show, smsc95xx_store);
+
+int smsc95xx_ledctl(struct usbnet *dev){
+
+    int ret = 0;
+    static struct class led_gpio = {
+
+        .name = "smsc95xx_leds",
+    };
+
+    if(leddev != NULL) return 0;
+
+    leddev = dev;
+
+    ret = class_register(&led_gpio);
+    if(ret){
+        leddev = NULL;
+        return ret;
+    }
+
+    ret += class_create_file(&led_gpio,&class_attr_eth_fdx);
+    ret += class_create_file(&led_gpio,&class_attr_eth_lnk);
+    ret += class_create_file(&led_gpio,&class_attr_eth_spd);
+
+    if(ret){
+        leddev = NULL;
+        class_unregister(&led_gpio);
+        return ret;
+    }
+
+    return 0;
+}
+
+static ssize_t smsc95xx_show(struct class *cls, struct class_attribute *attr, char *buf){
+
+return scnprintf(buf, PAGE_SIZE, "you can't even read");
+}
+
+
+static ssize_t smsc95xx_store(struct class *cls, struct class_attribute *attr, const char *buf, size_t count){
+int ret = 0;
+static u32 write_buf = LED_GPIO_CFG_FDX_LED |
+                       LED_GPIO_CFG_LNK_LED |
+                       LED_GPIO_CFG_SPD_LED;
+
+
+    if(buf[0] == '0'){
+
+        switch(attr->attr.name[6]){
+
+            case 'x': write_buf ^= LED_GPIO_CFG_FDX_LED; break;
+            case 'k': write_buf ^= LED_GPIO_CFG_LNK_LED; break;
+            case 'd': write_buf ^= LED_GPIO_CFG_SPD_LED; break;
+        }
+
+    }else if(buf[0] == '1'){
+
+        switch(attr->attr.name[6]){
+
+            case 'x': write_buf |= LED_GPIO_CFG_FDX_LED; break;
+            case 'k': write_buf |= LED_GPIO_CFG_LNK_LED; break;
+            case 'd': write_buf |= LED_GPIO_CFG_SPD_LED; break;
+        }
+    }
+
+    ret = smsc95xx_write_reg(leddev, LED_GPIO_CFG, write_buf);
+
+    if(ret < 0) netdev_warn(leddev->net,"Failed to write LED_GPIO_CFG: %d\n",ret);
+
+    return 1;
+}
+

If the file is correctly copied, you can start to build the image, this will take some time:

PROJECT=RPi2 ARCH=arm make image

Copy the new image to a fresh sd-card and insert it into the RPi2. After boot, connect to ssh (you have to enable the sshd via the on-screen menu which you will see at the beginning) and add a new file, called autostart.sh to the ~/.config/ directory:

autostart.sh

#!/bin/bash
 
# Turn off system LEDs
echo none > /sys/class/leds/led0/trigger
echo 0 > /sys/class/leds/led0/brightness
 
echo none > /sys/class/leds/led1/trigger
echo 0 > /sys/class/leds/led1/brightness
 
# Turn of network LEDs
echo 0 > /sys/class/smsc95xx_leds/eth_fdx
echo 0 > /sys/class/smsc95xx_leds/eth_lnk
echo 0 > /sys/class/smsc95xx_leds/eth_spd

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