alistair23-linux/drivers/net/can/led.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  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

  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 #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

141 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
* Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be>
*/
#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);
}