parent
43a3b5a53a
commit
9e6b3d16de
@ -0,0 +1,437 @@ |
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/*
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* LED Kernel Netdev Trigger |
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* |
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* Toggles the LED to reflect the link and traffic state of a named net device |
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* |
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* Copyright 2007 Oliver Jowett <oliver@opencloud.com> |
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* |
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* Derived from ledtrig-timer.c which is: |
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* Copyright 2005-2006 Openedhand Ltd. |
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* Author: Richard Purdie <rpurdie@openedhand.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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*/ |
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#include <linux/module.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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#include <linux/device.h> |
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#include <linux/sysdev.h> |
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#include <linux/netdevice.h> |
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#include <linux/timer.h> |
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#include <linux/ctype.h> |
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#include <linux/leds.h> |
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#include "leds.h" |
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/*
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* Configurable sysfs attributes: |
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* |
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* device_name - network device name to monitor |
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* |
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* interval - duration of LED blink, in milliseconds |
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* |
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* mode - either "none" (LED is off) or a space separated list of one or more of: |
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* link: LED's normal state reflects whether the link is up (has carrier) or not |
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* tx: LED blinks on transmitted data |
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* rx: LED blinks on receive data |
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*
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* Some suggestions: |
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* |
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* Simple link status LED: |
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* $ echo netdev >someled/trigger |
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* $ echo eth0 >someled/device_name |
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* $ echo link >someled/mode |
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* |
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* Ethernet-style link/activity LED: |
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* $ echo netdev >someled/trigger |
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* $ echo eth0 >someled/device_name |
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* $ echo "link tx rx" >someled/mode |
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* |
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* Modem-style tx/rx LEDs: |
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* $ echo netdev >led1/trigger |
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* $ echo ppp0 >led1/device_name |
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* $ echo tx >led1/mode |
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* $ echo netdev >led2/trigger |
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* $ echo ppp0 >led2/device_name |
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* $ echo rx >led2/mode |
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* |
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*/ |
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#define MODE_LINK 1 |
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#define MODE_TX 2 |
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#define MODE_RX 4 |
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struct led_netdev_data { |
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rwlock_t lock; |
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struct timer_list timer; |
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struct notifier_block notifier;
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struct led_classdev *led_cdev; |
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struct net_device *net_dev; |
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char device_name[IFNAMSIZ]; |
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unsigned interval; |
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unsigned mode; |
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unsigned link_up; |
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unsigned last_activity; |
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}; |
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static void set_baseline_state(struct led_netdev_data *trigger_data) |
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{
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if ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up) |
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led_set_brightness(trigger_data->led_cdev, LED_FULL); |
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else |
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led_set_brightness(trigger_data->led_cdev, LED_OFF); |
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if ((trigger_data->mode & (MODE_TX | MODE_RX)) != 0 && trigger_data->link_up) |
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mod_timer(&trigger_data->timer, jiffies + trigger_data->interval); |
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else |
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del_timer(&trigger_data->timer);
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}
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static ssize_t led_device_name_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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read_lock(&trigger_data->lock); |
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sprintf(buf, "%s\n", trigger_data->device_name); |
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read_unlock(&trigger_data->lock); |
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return strlen(buf) + 1; |
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} |
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static ssize_t led_device_name_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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if (size < 0 || size >= IFNAMSIZ) |
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return -EINVAL; |
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write_lock(&trigger_data->lock); |
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strcpy(trigger_data->device_name, buf); |
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if (size > 0 && trigger_data->device_name[size-1] == '\n') |
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trigger_data->device_name[size-1] = 0; |
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if (trigger_data->device_name[0] != 0) { |
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/* check for existing device to update from */ |
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trigger_data->net_dev = dev_get_by_name(trigger_data->device_name); |
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if (trigger_data->net_dev != NULL) |
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trigger_data->link_up = (dev_get_flags(trigger_data->net_dev) & IFF_LOWER_UP) != 0; |
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set_baseline_state(trigger_data); /* updates LEDs, may start timers */ |
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} |
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write_unlock(&trigger_data->lock);
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return size; |
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} |
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static DEVICE_ATTR(device_name, 0644, led_device_name_show, led_device_name_store); |
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static ssize_t led_mode_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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read_lock(&trigger_data->lock); |
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if (trigger_data->mode == 0) { |
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strcpy(buf, "none\n"); |
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} else { |
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if (trigger_data->mode & MODE_LINK)
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strcat(buf, "link "); |
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if (trigger_data->mode & MODE_TX) |
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strcat(buf, "tx "); |
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if (trigger_data->mode & MODE_RX) |
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strcat(buf, "rx "); |
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strcat(buf, "\n"); |
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} |
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read_unlock(&trigger_data->lock);
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return strlen(buf)+1; |
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} |
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static ssize_t led_mode_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data;
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char copybuf[1024]; |
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int new_mode = -1; |
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char *p, *token; |
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/* take a copy since we don't want to trash the inbound buffer when using strsep */ |
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strncpy(copybuf, buf, sizeof(copybuf)); |
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copybuf[1023] = 0; |
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p = copybuf; |
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while ((token = strsep(&p, " \t\n")) != NULL) { |
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if (!*token) |
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continue; |
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if (new_mode == -1) |
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new_mode = 0; |
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if (!strcmp(token, "none")) |
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new_mode = 0; |
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else if (!strcmp(token, "tx")) |
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new_mode |= MODE_TX; |
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else if (!strcmp(token, "rx")) |
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new_mode |= MODE_RX; |
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else if (!strcmp(token, "link")) |
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new_mode |= MODE_LINK; |
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else |
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return -EINVAL; |
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} |
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if (new_mode == -1) |
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return -EINVAL; |
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write_lock(&trigger_data->lock);
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trigger_data->mode = new_mode;
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set_baseline_state(trigger_data); |
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write_unlock(&trigger_data->lock); |
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return size; |
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} |
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static DEVICE_ATTR(mode, 0644, led_mode_show, led_mode_store); |
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static ssize_t led_interval_show(struct device *dev,
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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read_lock(&trigger_data->lock); |
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sprintf(buf, "%u\n", jiffies_to_msecs(trigger_data->interval)); |
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read_unlock(&trigger_data->lock); |
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return strlen(buf) + 1; |
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} |
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static ssize_t led_interval_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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int ret = -EINVAL; |
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char *after; |
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unsigned long value = simple_strtoul(buf, &after, 10); |
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size_t count = after - buf; |
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if (*after && isspace(*after)) |
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count++; |
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/* impose some basic bounds on the timer interval */ |
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if (count == size && value >= 5 && value <= 10000) { |
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write_lock(&trigger_data->lock); |
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trigger_data->interval = msecs_to_jiffies(value); |
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set_baseline_state(trigger_data); // resets timer
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write_unlock(&trigger_data->lock); |
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ret = count; |
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} |
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return ret; |
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} |
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static DEVICE_ATTR(interval, 0644, led_interval_show, led_interval_store); |
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static int netdev_trig_notify(struct notifier_block *nb, |
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unsigned long evt, |
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void *dv) |
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{ |
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struct net_device *dev = dv; |
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struct led_netdev_data *trigger_data = container_of(nb, struct led_netdev_data, notifier); |
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if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER) |
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return NOTIFY_DONE; |
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write_lock(&trigger_data->lock); |
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if (strcmp(dev->name, trigger_data->device_name)) |
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goto done; |
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if (evt == NETDEV_REGISTER) { |
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if (trigger_data->net_dev != NULL) |
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dev_put(trigger_data->net_dev); |
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dev_hold(dev); |
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trigger_data->net_dev = dev; |
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trigger_data->link_up = 0; |
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goto done; |
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} |
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if (evt == NETDEV_UNREGISTER && trigger_data->net_dev != NULL) { |
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dev_put(trigger_data->net_dev); |
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trigger_data->net_dev = NULL; |
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goto done; |
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} |
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/* UP / DOWN / CHANGE */ |
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trigger_data->link_up = (evt != NETDEV_DOWN && netif_carrier_ok(dev)); |
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set_baseline_state(trigger_data); |
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done: |
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write_unlock(&trigger_data->lock);
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return NOTIFY_DONE; |
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} |
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/* here's the real work! */ |
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static void netdev_trig_timer(unsigned long arg) |
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{ |
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struct led_netdev_data *trigger_data = (struct led_netdev_data *)arg; |
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struct net_device_stats *dev_stats; |
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unsigned new_activity; |
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write_lock(&trigger_data->lock); |
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if (!trigger_data->link_up || !trigger_data->net_dev || (trigger_data->mode & (MODE_TX | MODE_RX)) == 0) { |
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/* we don't need to do timer work, just reflect link state. */ |
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led_set_brightness(trigger_data->led_cdev, ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up) ? LED_FULL : LED_OFF); |
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goto no_restart; |
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} |
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dev_stats = trigger_data->net_dev->get_stats(trigger_data->net_dev); |
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new_activity = |
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((trigger_data->mode & MODE_TX) ? dev_stats->tx_packets : 0) + |
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((trigger_data->mode & MODE_RX) ? dev_stats->rx_packets : 0); |
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if (trigger_data->mode & MODE_LINK) { |
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/* base state is ON (link present) */ |
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/* if there's no link, we don't get this far and the LED is off */ |
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/* OFF -> ON always */ |
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/* ON -> OFF on activity */ |
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if (trigger_data->led_cdev->brightness == LED_OFF) { |
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led_set_brightness(trigger_data->led_cdev, LED_FULL); |
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} else if (trigger_data->last_activity != new_activity) { |
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led_set_brightness(trigger_data->led_cdev, LED_OFF); |
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} |
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} else { |
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/* base state is OFF */ |
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/* ON -> OFF always */ |
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/* OFF -> ON on activity */ |
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if (trigger_data->led_cdev->brightness == LED_FULL) { |
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led_set_brightness(trigger_data->led_cdev, LED_OFF); |
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} else if (trigger_data->last_activity != new_activity) { |
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led_set_brightness(trigger_data->led_cdev, LED_FULL); |
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} |
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} |
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trigger_data->last_activity = new_activity; |
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mod_timer(&trigger_data->timer, jiffies + trigger_data->interval); |
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no_restart: |
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write_unlock(&trigger_data->lock); |
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} |
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static void netdev_trig_activate(struct led_classdev *led_cdev) |
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{ |
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struct led_netdev_data *trigger_data; |
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int rc; |
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trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL); |
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if (!trigger_data) |
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return; |
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rwlock_init(&trigger_data->lock); |
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trigger_data->notifier.notifier_call = netdev_trig_notify; |
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trigger_data->notifier.priority = 10; |
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setup_timer(&trigger_data->timer, netdev_trig_timer, (unsigned long) trigger_data); |
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trigger_data->led_cdev = led_cdev; |
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trigger_data->net_dev = NULL; |
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trigger_data->device_name[0] = 0; |
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trigger_data->mode = 0; |
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trigger_data->interval = msecs_to_jiffies(50); |
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trigger_data->link_up = 0; |
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trigger_data->last_activity = 0; |
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led_cdev->trigger_data = trigger_data; |
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rc = device_create_file(led_cdev->dev, &dev_attr_device_name); |
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if (rc) |
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goto err_out; |
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rc = device_create_file(led_cdev->dev, &dev_attr_mode); |
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if (rc) |
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goto err_out_device_name; |
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rc = device_create_file(led_cdev->dev, &dev_attr_interval); |
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if (rc) |
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goto err_out_mode; |
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register_netdevice_notifier(&trigger_data->notifier);
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return; |
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err_out_mode: |
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device_remove_file(led_cdev->dev, &dev_attr_mode); |
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err_out_device_name: |
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device_remove_file(led_cdev->dev, &dev_attr_device_name); |
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err_out: |
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led_cdev->trigger_data = NULL; |
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kfree(trigger_data); |
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} |
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static void netdev_trig_deactivate(struct led_classdev *led_cdev) |
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{ |
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struct led_netdev_data *trigger_data = led_cdev->trigger_data; |
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if (trigger_data) {
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unregister_netdevice_notifier(&trigger_data->notifier); |
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device_remove_file(led_cdev->dev, &dev_attr_device_name); |
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device_remove_file(led_cdev->dev, &dev_attr_mode); |
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device_remove_file(led_cdev->dev, &dev_attr_interval); |
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write_lock(&trigger_data->lock); |
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if (trigger_data->net_dev) { |
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dev_put(trigger_data->net_dev); |
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trigger_data->net_dev = NULL; |
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} |
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write_unlock(&trigger_data->lock); |
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del_timer_sync(&trigger_data->timer); |
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kfree(trigger_data); |
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} |
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} |
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static struct led_trigger netdev_led_trigger = { |
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.name = "netdev", |
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.activate = netdev_trig_activate, |
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.deactivate = netdev_trig_deactivate, |
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}; |
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static int __init netdev_trig_init(void) |
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{ |
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return led_trigger_register(&netdev_led_trigger); |
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} |
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static void __exit netdev_trig_exit(void) |
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{ |
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led_trigger_unregister(&netdev_led_trigger); |
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} |
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module_init(netdev_trig_init); |
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module_exit(netdev_trig_exit); |
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MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>"); |
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MODULE_DESCRIPTION("Netdev LED trigger"); |
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MODULE_LICENSE("GPL"); |
@ -0,0 +1,25 @@ |
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Index: linux-2.6.23.16/drivers/leds/Kconfig
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===================================================================
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--- linux-2.6.23.16.orig/drivers/leds/Kconfig 2008-03-07 21:26:46.000000000 +0100
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+++ linux-2.6.23.16/drivers/leds/Kconfig 2008-03-07 21:27:50.000000000 +0100
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@@ -150,4 +150,11 @@
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This allows LEDs to be initialised in the ON state.
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If unsure, say Y.
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+config LEDS_TRIGGER_NETDEV
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+ tristate "LED Netdev Trigger"
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+ depends on LEDS_TRIGGERS
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+ help
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+ This allows LEDs to be controlled by network device activity.
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+ If unsure, say Y.
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+
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endif # NEW_LEDS
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Index: linux-2.6.23.16/drivers/leds/Makefile
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===================================================================
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--- linux-2.6.23.16.orig/drivers/leds/Makefile 2008-03-07 21:28:01.000000000 +0100
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+++ linux-2.6.23.16/drivers/leds/Makefile 2008-03-07 21:36:07.000000000 +0100
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@@ -25,3 +25,4 @@
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obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT) += ledtrig-heartbeat.o
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obj-$(CONFIG_LEDS_TRIGGER_MORSE) += ledtrig-morse.o
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obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
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+obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
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