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a1ef7bd9fc
The LED trigger name for CAN devices is based on the initial CAN device name, but does never change. The LED trigger name is not guaranteed to be unique in case of hotplugging CAN devices. This patch tries to address this problem by modifying the LED trigger name according to the CAN device name when the latter changes. v1 - Kurt Van Dijck v2 - Fabio Baltieri - remove rename blocking if trigger is bound - use led-subsystem function for the actual rename (still WiP) - call init/exit functions from dev.c v3 - Kurt Van Dijck - safe operation for non-candev based devices (vcan, slcan) based on earlier patch v4 - Kurt Van Dijck - trivial patch mistakes fixed Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be> Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
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* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
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* Copyright 2012, Kurt Van Dijck <kurt.van.dijck@eia.be>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/can/dev.h>
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#include <linux/can/led.h>
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static unsigned long led_delay = 50;
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module_param(led_delay, ulong, 0644);
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MODULE_PARM_DESC(led_delay,
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"blink delay time for activity leds (msecs, default: 50).");
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/* Trigger a LED event in response to a CAN device event */
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void can_led_event(struct net_device *netdev, enum can_led_event event)
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{
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struct can_priv *priv = netdev_priv(netdev);
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switch (event) {
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case CAN_LED_EVENT_OPEN:
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led_trigger_event(priv->tx_led_trig, LED_FULL);
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led_trigger_event(priv->rx_led_trig, LED_FULL);
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break;
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case CAN_LED_EVENT_STOP:
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led_trigger_event(priv->tx_led_trig, LED_OFF);
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led_trigger_event(priv->rx_led_trig, LED_OFF);
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break;
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case CAN_LED_EVENT_TX:
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if (led_delay)
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led_trigger_blink_oneshot(priv->tx_led_trig,
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&led_delay, &led_delay, 1);
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break;
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case CAN_LED_EVENT_RX:
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if (led_delay)
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led_trigger_blink_oneshot(priv->rx_led_trig,
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&led_delay, &led_delay, 1);
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break;
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}
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}
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EXPORT_SYMBOL_GPL(can_led_event);
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static void can_led_release(struct device *gendev, void *res)
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{
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struct can_priv *priv = netdev_priv(to_net_dev(gendev));
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led_trigger_unregister_simple(priv->tx_led_trig);
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led_trigger_unregister_simple(priv->rx_led_trig);
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}
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/* Register CAN LED triggers for a CAN device
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*
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* This is normally called from a driver's probe function
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*/
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void devm_can_led_init(struct net_device *netdev)
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{
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struct can_priv *priv = netdev_priv(netdev);
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void *res;
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res = devres_alloc(can_led_release, 0, GFP_KERNEL);
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if (!res) {
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netdev_err(netdev, "cannot register LED triggers\n");
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return;
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}
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snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name),
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"%s-tx", netdev->name);
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snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name),
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"%s-rx", netdev->name);
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led_trigger_register_simple(priv->tx_led_trig_name,
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&priv->tx_led_trig);
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led_trigger_register_simple(priv->rx_led_trig_name,
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&priv->rx_led_trig);
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devres_add(&netdev->dev, res);
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}
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EXPORT_SYMBOL_GPL(devm_can_led_init);
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/* NETDEV rename notifier to rename the associated led triggers too */
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static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
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void *data)
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{
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struct net_device *netdev = data;
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struct can_priv *priv = safe_candev_priv(netdev);
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char name[CAN_LED_NAME_SZ];
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if (!priv)
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return NOTIFY_DONE;
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if (msg == NETDEV_CHANGENAME) {
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snprintf(name, sizeof(name), "%s-tx", netdev->name);
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led_trigger_rename_static(name, priv->tx_led_trig);
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snprintf(name, sizeof(name), "%s-rx", netdev->name);
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led_trigger_rename_static(name, priv->rx_led_trig);
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}
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return NOTIFY_DONE;
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}
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/* notifier block for netdevice event */
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static struct notifier_block can_netdev_notifier __read_mostly = {
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.notifier_call = can_led_notifier,
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};
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int __init can_led_notifier_init(void)
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{
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return register_netdevice_notifier(&can_netdev_notifier);
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}
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void __exit can_led_notifier_exit(void)
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{
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unregister_netdevice_notifier(&can_netdev_notifier);
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}
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