// SPDX-License-Identifier: GPL-2.0 // Copyright 2017 Ben Whitten <[email protected]> // Copyright 2007 Oliver Jowett <[email protected]> // // LED Kernel Netdev Trigger // // Toggles the LED to reflect the link and traffic state of a named net device // // Derived from ledtrig-timer.c which is: // Copyright 2005-2006 Openedhand Ltd. // Author: Richard Purdie <[email protected]> #include <linux/atomic.h> #include <linux/ctype.h> #include <linux/device.h> #include <linux/ethtool.h> #include <linux/init.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/leds.h> #include <linux/linkmode.h> #include <linux/list.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/mutex.h> #include <linux/phy.h> #include <linux/rtnetlink.h> #include <linux/timer.h> #include "../leds.h" #define NETDEV_LED_DEFAULT_INTERVAL … /* * Configurable sysfs attributes: * * device_name - network device name to monitor * interval - duration of LED blink, in milliseconds * link - LED's normal state reflects whether the link is up * (has carrier) or not * tx - LED blinks on transmitted data * rx - LED blinks on receive data * tx_err - LED blinks on transmit error * rx_err - LED blinks on receive error * * Note: If the user selects a mode that is not supported by hw, default * behavior is to fall back to software control of the LED. However not every * hw supports software control. LED callbacks brightness_set() and * brightness_set_blocking() are NULL in this case. hw_control_is_supported() * should use available means supported by hw to inform the user that selected * mode isn't supported by hw. This could be switching off the LED or any * hw blink mode. If software control fallback isn't possible, we return * -EOPNOTSUPP to the user, but still store the selected mode. This is needed * in case an intermediate unsupported mode is necessary to switch from one * supported mode to another. */ struct led_netdev_data { … }; static const struct attribute_group netdev_trig_link_speed_attrs_group; static void set_baseline_state(struct led_netdev_data *trigger_data) { … } static bool supports_hw_control(struct led_classdev *led_cdev) { … } /* * Validate the configured netdev is the same as the one associated with * the LED driver in hw control. */ static bool validate_net_dev(struct led_classdev *led_cdev, struct net_device *net_dev) { … } static bool can_hw_control(struct led_netdev_data *trigger_data) { … } static void get_device_state(struct led_netdev_data *trigger_data) { … } static ssize_t device_name_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static int set_device_name(struct led_netdev_data *trigger_data, const char *name, size_t size) { … } static ssize_t device_name_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { … } static DEVICE_ATTR_RW(device_name); static ssize_t netdev_led_attr_show(struct device *dev, char *buf, enum led_trigger_netdev_modes attr) { … } static ssize_t netdev_led_attr_store(struct device *dev, const char *buf, size_t size, enum led_trigger_netdev_modes attr) { … } #define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) … DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); DEFINE_NETDEV_TRIGGER(…); static ssize_t interval_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t interval_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { … } static DEVICE_ATTR_RW(interval); static ssize_t offloaded_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(offloaded); #define CHECK_LINK_MODE_ATTR(link_speed) … static umode_t netdev_trig_link_speed_visible(struct kobject *kobj, struct attribute *attr, int n) { … } static struct attribute *netdev_trig_link_speed_attrs[] = …; static const struct attribute_group netdev_trig_link_speed_attrs_group = …; static struct attribute *netdev_trig_attrs[] = …; static const struct attribute_group netdev_trig_attrs_group = …; static const struct attribute_group *netdev_trig_groups[] = …; static int netdev_trig_notify(struct notifier_block *nb, unsigned long evt, void *dv) { … } /* here's the real work! */ static void netdev_trig_work(struct work_struct *work) { … } static int netdev_trig_activate(struct led_classdev *led_cdev) { … } static void netdev_trig_deactivate(struct led_classdev *led_cdev) { … } static struct led_trigger netdev_led_trigger = …; module_led_trigger(…); MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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