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996a953de0
This patch implements the functions to add two LED triggers, named <ifname>-tx and <ifname>-rx, to a canbus device driver. Triggers are called from specific handlers by each CAN device driver and can be disabled altogether with a Kconfig option. The implementation keeps the LED on when the interface is UP and blinks the LED on network activity at a configurable rate. This only supports can-dev based drivers, as it uses some support field in the can_priv structure. Supported drivers should call devm_can_led_init() and can_led_event() as needed. Cleanup is handled automatically by devres, so no *_exit function is needed. Supported events are: - CAN_LED_EVENT_OPEN: turn on tx/rx LEDs - CAN_LED_EVENT_STOP: turn off tx/rx LEDs - CAN_LED_EVENT_TX: trigger tx LED blink - CAN_LED_EVENT_RX: trigger tx LED blink Cc: Wolfgang Grandegger <wg@grandegger.com> Cc: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
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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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