mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
c54eb70e3b
Add <ifname>-rxtx trigger, that will be activated both for tx as rx events. This trigger mimics "activity" LED for Ethernet devices. Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
|
|
* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
|
|
* Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be>
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/can/dev.h>
|
|
|
|
#include <linux/can/led.h>
|
|
|
|
static unsigned long led_delay = 50;
|
|
module_param(led_delay, ulong, 0644);
|
|
MODULE_PARM_DESC(led_delay,
|
|
"blink delay time for activity leds (msecs, default: 50).");
|
|
|
|
/* Trigger a LED event in response to a CAN device event */
|
|
void can_led_event(struct net_device *netdev, enum can_led_event event)
|
|
{
|
|
struct can_priv *priv = netdev_priv(netdev);
|
|
|
|
switch (event) {
|
|
case CAN_LED_EVENT_OPEN:
|
|
led_trigger_event(priv->tx_led_trig, LED_FULL);
|
|
led_trigger_event(priv->rx_led_trig, LED_FULL);
|
|
led_trigger_event(priv->rxtx_led_trig, LED_FULL);
|
|
break;
|
|
case CAN_LED_EVENT_STOP:
|
|
led_trigger_event(priv->tx_led_trig, LED_OFF);
|
|
led_trigger_event(priv->rx_led_trig, LED_OFF);
|
|
led_trigger_event(priv->rxtx_led_trig, LED_OFF);
|
|
break;
|
|
case CAN_LED_EVENT_TX:
|
|
if (led_delay) {
|
|
led_trigger_blink_oneshot(priv->tx_led_trig,
|
|
&led_delay, &led_delay, 1);
|
|
led_trigger_blink_oneshot(priv->rxtx_led_trig,
|
|
&led_delay, &led_delay, 1);
|
|
}
|
|
break;
|
|
case CAN_LED_EVENT_RX:
|
|
if (led_delay) {
|
|
led_trigger_blink_oneshot(priv->rx_led_trig,
|
|
&led_delay, &led_delay, 1);
|
|
led_trigger_blink_oneshot(priv->rxtx_led_trig,
|
|
&led_delay, &led_delay, 1);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(can_led_event);
|
|
|
|
static void can_led_release(struct device *gendev, void *res)
|
|
{
|
|
struct can_priv *priv = netdev_priv(to_net_dev(gendev));
|
|
|
|
led_trigger_unregister_simple(priv->tx_led_trig);
|
|
led_trigger_unregister_simple(priv->rx_led_trig);
|
|
led_trigger_unregister_simple(priv->rxtx_led_trig);
|
|
}
|
|
|
|
/* Register CAN LED triggers for a CAN device
|
|
*
|
|
* This is normally called from a driver's probe function
|
|
*/
|
|
void devm_can_led_init(struct net_device *netdev)
|
|
{
|
|
struct can_priv *priv = netdev_priv(netdev);
|
|
void *res;
|
|
|
|
res = devres_alloc(can_led_release, 0, GFP_KERNEL);
|
|
if (!res) {
|
|
netdev_err(netdev, "cannot register LED triggers\n");
|
|
return;
|
|
}
|
|
|
|
snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name),
|
|
"%s-tx", netdev->name);
|
|
snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name),
|
|
"%s-rx", netdev->name);
|
|
snprintf(priv->rxtx_led_trig_name, sizeof(priv->rxtx_led_trig_name),
|
|
"%s-rxtx", netdev->name);
|
|
|
|
led_trigger_register_simple(priv->tx_led_trig_name,
|
|
&priv->tx_led_trig);
|
|
led_trigger_register_simple(priv->rx_led_trig_name,
|
|
&priv->rx_led_trig);
|
|
led_trigger_register_simple(priv->rxtx_led_trig_name,
|
|
&priv->rxtx_led_trig);
|
|
|
|
devres_add(&netdev->dev, res);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_can_led_init);
|
|
|
|
/* NETDEV rename notifier to rename the associated led triggers too */
|
|
static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
|
|
void *ptr)
|
|
{
|
|
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
|
|
struct can_priv *priv = safe_candev_priv(netdev);
|
|
char name[CAN_LED_NAME_SZ];
|
|
|
|
if (!priv)
|
|
return NOTIFY_DONE;
|
|
|
|
if (!priv->tx_led_trig || !priv->rx_led_trig || !priv->rxtx_led_trig)
|
|
return NOTIFY_DONE;
|
|
|
|
if (msg == NETDEV_CHANGENAME) {
|
|
snprintf(name, sizeof(name), "%s-tx", netdev->name);
|
|
led_trigger_rename_static(name, priv->tx_led_trig);
|
|
|
|
snprintf(name, sizeof(name), "%s-rx", netdev->name);
|
|
led_trigger_rename_static(name, priv->rx_led_trig);
|
|
|
|
snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
|
|
led_trigger_rename_static(name, priv->rxtx_led_trig);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/* notifier block for netdevice event */
|
|
static struct notifier_block can_netdev_notifier __read_mostly = {
|
|
.notifier_call = can_led_notifier,
|
|
};
|
|
|
|
int __init can_led_notifier_init(void)
|
|
{
|
|
return register_netdevice_notifier(&can_netdev_notifier);
|
|
}
|
|
|
|
void __exit can_led_notifier_exit(void)
|
|
{
|
|
unregister_netdevice_notifier(&can_netdev_notifier);
|
|
}
|