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// SPDX-License-Identifier: GPL-2.0
// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
//
// LED Kernel Netdev Trigger
//
// Toggles the LED to reflect the link and traffic state of a named net device
//
// Derived from ledtrig-timer.c which is:
// Copyright 2005-2006 Openedhand Ltd.
// Author: Richard Purdie <rpurdie@openedhand.com>
#include <linux/atomic.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include "../leds.h"
/*
* Configurable sysfs attributes:
*
* device_name - network device name to monitor
* interval - duration of LED blink, in milliseconds
* link - LED's normal state reflects whether the link is up
* (has carrier) or not
* tx - LED blinks on transmitted data
* rx - LED blinks on receive data
*
*/
struct led_netdev_data {
spinlock_t lock;
struct delayed_work work;
struct notifier_block notifier;
struct led_classdev *led_cdev;
struct net_device *net_dev;
char device_name[IFNAMSIZ];
atomic_t interval;
unsigned int last_activity;
unsigned long mode;
#define NETDEV_LED_LINK 0
#define NETDEV_LED_TX 1
#define NETDEV_LED_RX 2
#define NETDEV_LED_MODE_LINKUP 3
};
enum netdev_led_attr {
NETDEV_ATTR_LINK,
NETDEV_ATTR_TX,
NETDEV_ATTR_RX
};
static void set_baseline_state(struct led_netdev_data *trigger_data)
{
int current_brightness;
struct led_classdev *led_cdev = trigger_data->led_cdev;
current_brightness = led_cdev->brightness;
if (current_brightness)
led_cdev->blink_brightness = current_brightness;
if (!led_cdev->blink_brightness)
led_cdev->blink_brightness = led_cdev->max_brightness;
if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
led_set_brightness(led_cdev, LED_OFF);
else {
if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
led_set_brightness(led_cdev,
led_cdev->blink_brightness);
else
led_set_brightness(led_cdev, LED_OFF);
/* If we are looking for RX/TX start periodically
* checking stats
*/
if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
test_bit(NETDEV_LED_RX, &trigger_data->mode))
schedule_delayed_work(&trigger_data->work, 0);
}
}
static ssize_t device_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
ssize_t len;
spin_lock_bh(&trigger_data->lock);
len = sprintf(buf, "%s\n", trigger_data->device_name);
spin_unlock_bh(&trigger_data->lock);
return len;
}
static ssize_t device_name_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t size)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
if (size >= IFNAMSIZ)
return -EINVAL;
cancel_delayed_work_sync(&trigger_data->work);
spin_lock_bh(&trigger_data->lock);
if (trigger_data->net_dev) {
dev_put(trigger_data->net_dev);
trigger_data->net_dev = NULL;
}
strncpy(trigger_data->device_name, buf, size);
if (size > 0 && trigger_data->device_name[size - 1] == '\n')
trigger_data->device_name[size - 1] = 0;
if (trigger_data->device_name[0] != 0)
trigger_data->net_dev =
dev_get_by_name(&init_net, trigger_data->device_name);
clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
if (trigger_data->net_dev != NULL)
if (netif_carrier_ok(trigger_data->net_dev))
set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
trigger_data->last_activity = 0;
set_baseline_state(trigger_data);
spin_unlock_bh(&trigger_data->lock);
return size;
}
static DEVICE_ATTR_RW(device_name);
static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
enum netdev_led_attr attr)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
int bit;
switch (attr) {
case NETDEV_ATTR_LINK:
bit = NETDEV_LED_LINK;
break;
case NETDEV_ATTR_TX:
bit = NETDEV_LED_TX;
break;
case NETDEV_ATTR_RX:
bit = NETDEV_LED_RX;
break;
default:
return -EINVAL;
}
return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
}
static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
size_t size, enum netdev_led_attr attr)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
unsigned long state;
int ret;
int bit;
ret = kstrtoul(buf, 0, &state);
if (ret)
return ret;
switch (attr) {
case NETDEV_ATTR_LINK:
bit = NETDEV_LED_LINK;
break;
case NETDEV_ATTR_TX:
bit = NETDEV_LED_TX;
break;
case NETDEV_ATTR_RX:
bit = NETDEV_LED_RX;
break;
default:
return -EINVAL;
}
cancel_delayed_work_sync(&trigger_data->work);
if (state)
set_bit(bit, &trigger_data->mode);
else
clear_bit(bit, &trigger_data->mode);
set_baseline_state(trigger_data);
return size;
}
static ssize_t link_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
}
static ssize_t link_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
}
static DEVICE_ATTR_RW(link);
static ssize_t tx_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
}
static ssize_t tx_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
}
static DEVICE_ATTR_RW(tx);
static ssize_t rx_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
}
static ssize_t rx_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
}
static DEVICE_ATTR_RW(rx);
static ssize_t interval_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n",
jiffies_to_msecs(atomic_read(&trigger_data->interval)));
}
static ssize_t interval_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t size)
{
struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
unsigned long value;
int ret;
ret = kstrtoul(buf, 0, &value);
if (ret)
return ret;
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