mirror of https://gitee.com/openkylin/linux.git
141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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led_trigger_event(priv->rxtx_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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led_trigger_event(priv->rxtx_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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led_trigger_blink_oneshot(priv->rxtx_led_trig,
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&led_delay, &led_delay, 1);
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}
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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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led_trigger_blink_oneshot(priv->rxtx_led_trig,
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&led_delay, &led_delay, 1);
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}
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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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led_trigger_unregister_simple(priv->rxtx_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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snprintf(priv->rxtx_led_trig_name, sizeof(priv->rxtx_led_trig_name),
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"%s-rxtx", 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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led_trigger_register_simple(priv->rxtx_led_trig_name,
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&priv->rxtx_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 *ptr)
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{
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struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
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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 (!priv->tx_led_trig || !priv->rx_led_trig || !priv->rxtx_led_trig)
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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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snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
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led_trigger_rename_static(name, priv->rxtx_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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