From 9e6b3d16decd6804aa3452b0013838107e98ae77 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 7 Mar 2008 21:25:02 +0000 Subject: [PATCH] add new led trigger for network traffic, fixes #2776 SVN-Revision: 10566 --- target/linux/generic-2.6/config-2.6.23 | 1 + .../files/drivers/leds/ledtrig-netdev.c | 437 ++++++++++++++++++ .../patches-2.6.23/403-ledtrig_netdev.patch | 25 + 3 files changed, 463 insertions(+) create mode 100644 target/linux/generic-2.6/files/drivers/leds/ledtrig-netdev.c create mode 100644 target/linux/generic-2.6/patches-2.6.23/403-ledtrig_netdev.patch diff --git a/target/linux/generic-2.6/config-2.6.23 b/target/linux/generic-2.6/config-2.6.23 index ca4f7b76e3..b70d9a4549 100644 --- a/target/linux/generic-2.6/config-2.6.23 +++ b/target/linux/generic-2.6/config-2.6.23 @@ -678,6 +678,7 @@ CONFIG_LEDS_TRIGGER_HEARTBEAT=y # CONFIG_LEDS_TRIGGER_MORSE is not set CONFIG_LEDS_TRIGGER_TIMER=y # CONFIG_LEDS_TRIGGER_DEFAULT_ON is not set +# CONFIG_LEDS_TRIGGER_NETDEV is not set # CONFIG_LEGACY_PTYS is not set CONFIG_LIBCRC32C=m # CONFIG_LIBERTAS is not set diff --git a/target/linux/generic-2.6/files/drivers/leds/ledtrig-netdev.c b/target/linux/generic-2.6/files/drivers/leds/ledtrig-netdev.c new file mode 100644 index 0000000000..285d0f795c --- /dev/null +++ b/target/linux/generic-2.6/files/drivers/leds/ledtrig-netdev.c @@ -0,0 +1,437 @@ +/* + * LED Kernel Netdev Trigger + * + * Toggles the LED to reflect the link and traffic state of a named net device + * + * Copyright 2007 Oliver Jowett + * + * Derived from ledtrig-timer.c which is: + * Copyright 2005-2006 Openedhand Ltd. + * Author: Richard Purdie + * + * 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "leds.h" + +/* + * Configurable sysfs attributes: + * + * device_name - network device name to monitor + * + * interval - duration of LED blink, in milliseconds + * + * mode - either "none" (LED is off) or a space separated list of one or more of: + * 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 + * + * Some suggestions: + * + * Simple link status LED: + * $ echo netdev >someled/trigger + * $ echo eth0 >someled/device_name + * $ echo link >someled/mode + * + * Ethernet-style link/activity LED: + * $ echo netdev >someled/trigger + * $ echo eth0 >someled/device_name + * $ echo "link tx rx" >someled/mode + * + * Modem-style tx/rx LEDs: + * $ echo netdev >led1/trigger + * $ echo ppp0 >led1/device_name + * $ echo tx >led1/mode + * $ echo netdev >led2/trigger + * $ echo ppp0 >led2/device_name + * $ echo rx >led2/mode + * + */ + +#define MODE_LINK 1 +#define MODE_TX 2 +#define MODE_RX 4 + +struct led_netdev_data { + rwlock_t lock; + + struct timer_list timer; + struct notifier_block notifier; + + struct led_classdev *led_cdev; + struct net_device *net_dev; + + char device_name[IFNAMSIZ]; + unsigned interval; + unsigned mode; + unsigned link_up; + unsigned last_activity; +}; + +static void set_baseline_state(struct led_netdev_data *trigger_data) +{ + if ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up) + led_set_brightness(trigger_data->led_cdev, LED_FULL); + else + led_set_brightness(trigger_data->led_cdev, LED_OFF); + + if ((trigger_data->mode & (MODE_TX | MODE_RX)) != 0 && trigger_data->link_up) + mod_timer(&trigger_data->timer, jiffies + trigger_data->interval); + else + del_timer(&trigger_data->timer); +} + +static ssize_t led_device_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + + read_lock(&trigger_data->lock); + sprintf(buf, "%s\n", trigger_data->device_name); + read_unlock(&trigger_data->lock); + + return strlen(buf) + 1; +} + +static ssize_t led_device_name_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + + if (size < 0 || size >= IFNAMSIZ) + return -EINVAL; + + write_lock(&trigger_data->lock); + + strcpy(trigger_data->device_name, buf); + if (size > 0 && trigger_data->device_name[size-1] == '\n') + trigger_data->device_name[size-1] = 0; + + if (trigger_data->device_name[0] != 0) { + /* check for existing device to update from */ + trigger_data->net_dev = dev_get_by_name(trigger_data->device_name); + if (trigger_data->net_dev != NULL) + trigger_data->link_up = (dev_get_flags(trigger_data->net_dev) & IFF_LOWER_UP) != 0; + set_baseline_state(trigger_data); /* updates LEDs, may start timers */ + } + + write_unlock(&trigger_data->lock); + return size; +} + +static DEVICE_ATTR(device_name, 0644, led_device_name_show, led_device_name_store); + +static ssize_t led_mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + + read_lock(&trigger_data->lock); + + if (trigger_data->mode == 0) { + strcpy(buf, "none\n"); + } else { + if (trigger_data->mode & MODE_LINK) + strcat(buf, "link "); + if (trigger_data->mode & MODE_TX) + strcat(buf, "tx "); + if (trigger_data->mode & MODE_RX) + strcat(buf, "rx "); + strcat(buf, "\n"); + } + + read_unlock(&trigger_data->lock); + + return strlen(buf)+1; +} + +static ssize_t led_mode_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + char copybuf[1024]; + int new_mode = -1; + char *p, *token; + + /* take a copy since we don't want to trash the inbound buffer when using strsep */ + strncpy(copybuf, buf, sizeof(copybuf)); + copybuf[1023] = 0; + p = copybuf; + + while ((token = strsep(&p, " \t\n")) != NULL) { + if (!*token) + continue; + + if (new_mode == -1) + new_mode = 0; + + if (!strcmp(token, "none")) + new_mode = 0; + else if (!strcmp(token, "tx")) + new_mode |= MODE_TX; + else if (!strcmp(token, "rx")) + new_mode |= MODE_RX; + else if (!strcmp(token, "link")) + new_mode |= MODE_LINK; + else + return -EINVAL; + } + + if (new_mode == -1) + return -EINVAL; + + write_lock(&trigger_data->lock); + trigger_data->mode = new_mode; + set_baseline_state(trigger_data); + write_unlock(&trigger_data->lock); + + return size; +} + +static DEVICE_ATTR(mode, 0644, led_mode_show, led_mode_store); + +static ssize_t led_interval_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + + read_lock(&trigger_data->lock); + sprintf(buf, "%u\n", jiffies_to_msecs(trigger_data->interval)); + read_unlock(&trigger_data->lock); + + return strlen(buf) + 1; +} + +static ssize_t led_interval_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + int ret = -EINVAL; + char *after; + unsigned long value = simple_strtoul(buf, &after, 10); + size_t count = after - buf; + + if (*after && isspace(*after)) + count++; + + /* impose some basic bounds on the timer interval */ + if (count == size && value >= 5 && value <= 10000) { + write_lock(&trigger_data->lock); + trigger_data->interval = msecs_to_jiffies(value); + set_baseline_state(trigger_data); // resets timer + write_unlock(&trigger_data->lock); + ret = count; + } + + return ret; +} + +static DEVICE_ATTR(interval, 0644, led_interval_show, led_interval_store); + +static int netdev_trig_notify(struct notifier_block *nb, + unsigned long evt, + void *dv) +{ + struct net_device *dev = dv; + struct led_netdev_data *trigger_data = container_of(nb, struct led_netdev_data, notifier); + + if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER) + return NOTIFY_DONE; + + write_lock(&trigger_data->lock); + + if (strcmp(dev->name, trigger_data->device_name)) + goto done; + + if (evt == NETDEV_REGISTER) { + if (trigger_data->net_dev != NULL) + dev_put(trigger_data->net_dev); + dev_hold(dev); + trigger_data->net_dev = dev; + trigger_data->link_up = 0; + goto done; + } + + if (evt == NETDEV_UNREGISTER && trigger_data->net_dev != NULL) { + dev_put(trigger_data->net_dev); + trigger_data->net_dev = NULL; + goto done; + } + + /* UP / DOWN / CHANGE */ + + trigger_data->link_up = (evt != NETDEV_DOWN && netif_carrier_ok(dev)); + set_baseline_state(trigger_data); + +done: + write_unlock(&trigger_data->lock); + return NOTIFY_DONE; +} + +/* here's the real work! */ +static void netdev_trig_timer(unsigned long arg) +{ + struct led_netdev_data *trigger_data = (struct led_netdev_data *)arg; + struct net_device_stats *dev_stats; + unsigned new_activity; + + write_lock(&trigger_data->lock); + + if (!trigger_data->link_up || !trigger_data->net_dev || (trigger_data->mode & (MODE_TX | MODE_RX)) == 0) { + /* we don't need to do timer work, just reflect link state. */ + led_set_brightness(trigger_data->led_cdev, ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up) ? LED_FULL : LED_OFF); + goto no_restart; + } + + dev_stats = trigger_data->net_dev->get_stats(trigger_data->net_dev); + new_activity = + ((trigger_data->mode & MODE_TX) ? dev_stats->tx_packets : 0) + + ((trigger_data->mode & MODE_RX) ? dev_stats->rx_packets : 0); + + if (trigger_data->mode & MODE_LINK) { + /* base state is ON (link present) */ + /* if there's no link, we don't get this far and the LED is off */ + + /* OFF -> ON always */ + /* ON -> OFF on activity */ + if (trigger_data->led_cdev->brightness == LED_OFF) { + led_set_brightness(trigger_data->led_cdev, LED_FULL); + } else if (trigger_data->last_activity != new_activity) { + led_set_brightness(trigger_data->led_cdev, LED_OFF); + } + } else { + /* base state is OFF */ + /* ON -> OFF always */ + /* OFF -> ON on activity */ + if (trigger_data->led_cdev->brightness == LED_FULL) { + led_set_brightness(trigger_data->led_cdev, LED_OFF); + } else if (trigger_data->last_activity != new_activity) { + led_set_brightness(trigger_data->led_cdev, LED_FULL); + } + } + + trigger_data->last_activity = new_activity; + mod_timer(&trigger_data->timer, jiffies + trigger_data->interval); + +no_restart: + write_unlock(&trigger_data->lock); +} + +static void netdev_trig_activate(struct led_classdev *led_cdev) +{ + struct led_netdev_data *trigger_data; + int rc; + + trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL); + if (!trigger_data) + return; + + rwlock_init(&trigger_data->lock); + + trigger_data->notifier.notifier_call = netdev_trig_notify; + trigger_data->notifier.priority = 10; + + setup_timer(&trigger_data->timer, netdev_trig_timer, (unsigned long) trigger_data); + + trigger_data->led_cdev = led_cdev; + trigger_data->net_dev = NULL; + trigger_data->device_name[0] = 0; + + trigger_data->mode = 0; + trigger_data->interval = msecs_to_jiffies(50); + trigger_data->link_up = 0; + trigger_data->last_activity = 0; + + led_cdev->trigger_data = trigger_data; + + rc = device_create_file(led_cdev->dev, &dev_attr_device_name); + if (rc) + goto err_out; + rc = device_create_file(led_cdev->dev, &dev_attr_mode); + if (rc) + goto err_out_device_name; + rc = device_create_file(led_cdev->dev, &dev_attr_interval); + if (rc) + goto err_out_mode; + + register_netdevice_notifier(&trigger_data->notifier); + return; + +err_out_mode: + device_remove_file(led_cdev->dev, &dev_attr_mode); +err_out_device_name: + device_remove_file(led_cdev->dev, &dev_attr_device_name); +err_out: + led_cdev->trigger_data = NULL; + kfree(trigger_data); +} + +static void netdev_trig_deactivate(struct led_classdev *led_cdev) +{ + struct led_netdev_data *trigger_data = led_cdev->trigger_data; + + if (trigger_data) { + unregister_netdevice_notifier(&trigger_data->notifier); + + device_remove_file(led_cdev->dev, &dev_attr_device_name); + device_remove_file(led_cdev->dev, &dev_attr_mode); + device_remove_file(led_cdev->dev, &dev_attr_interval); + + write_lock(&trigger_data->lock); + + if (trigger_data->net_dev) { + dev_put(trigger_data->net_dev); + trigger_data->net_dev = NULL; + } + + write_unlock(&trigger_data->lock); + + del_timer_sync(&trigger_data->timer); + + kfree(trigger_data); + } +} + +static struct led_trigger netdev_led_trigger = { + .name = "netdev", + .activate = netdev_trig_activate, + .deactivate = netdev_trig_deactivate, +}; + +static int __init netdev_trig_init(void) +{ + return led_trigger_register(&netdev_led_trigger); +} + +static void __exit netdev_trig_exit(void) +{ + led_trigger_unregister(&netdev_led_trigger); +} + +module_init(netdev_trig_init); +module_exit(netdev_trig_exit); + +MODULE_AUTHOR("Oliver Jowett "); +MODULE_DESCRIPTION("Netdev LED trigger"); +MODULE_LICENSE("GPL"); diff --git a/target/linux/generic-2.6/patches-2.6.23/403-ledtrig_netdev.patch b/target/linux/generic-2.6/patches-2.6.23/403-ledtrig_netdev.patch new file mode 100644 index 0000000000..4dab89316c --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.23/403-ledtrig_netdev.patch @@ -0,0 +1,25 @@ +Index: linux-2.6.23.16/drivers/leds/Kconfig +=================================================================== +--- linux-2.6.23.16.orig/drivers/leds/Kconfig 2008-03-07 21:26:46.000000000 +0100 ++++ linux-2.6.23.16/drivers/leds/Kconfig 2008-03-07 21:27:50.000000000 +0100 +@@ -150,4 +150,11 @@ + This allows LEDs to be initialised in the ON state. + If unsure, say Y. + ++config LEDS_TRIGGER_NETDEV ++ tristate "LED Netdev Trigger" ++ depends on LEDS_TRIGGERS ++ help ++ This allows LEDs to be controlled by network device activity. ++ If unsure, say Y. ++ + endif # NEW_LEDS +Index: linux-2.6.23.16/drivers/leds/Makefile +=================================================================== +--- linux-2.6.23.16.orig/drivers/leds/Makefile 2008-03-07 21:28:01.000000000 +0100 ++++ linux-2.6.23.16/drivers/leds/Makefile 2008-03-07 21:36:07.000000000 +0100 +@@ -25,3 +25,4 @@ + obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o + obj-$(CONFIG_LEDS_TRIGGER_MORSE) += ledtrig-morse.o + obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o ++obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o -- 2.25.1