target/linux/generic/backport-4.14/400-v4.16-leds-trigger-Introduce-a-NETDEV-trigger.patch

   1 From 06f502f57d0d7728f9fa0f157ec5e4111ddb98f6 Mon Sep 17 00:00:00 2001
   2 From: Ben Whitten <ben.whitten@gmail.com>
   3 Date: Sun, 10 Dec 2017 21:17:55 +0000
   4 Subject: [PATCH] leds: trigger: Introduce a NETDEV trigger
   5
   6 This commit introduces a NETDEV trigger for named device
   7 activity. Available triggers are link, rx, and tx.
   8
   9 Signed-off-by: Ben Whitten <ben.whitten@gmail.com>
  10 Acked-by: Pavel Machek <pavel@ucw.cz>
  11 Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
  12 ---
  13  .../ABI/testing/sysfs-class-led-trigger-netdev     |  45 ++
  14  drivers/leds/trigger/Kconfig                       |   7 +
  15  drivers/leds/trigger/Makefile                      |   1 +
  16  drivers/leds/trigger/ledtrig-netdev.c              | 496 +++++++++++++++++++++
  17  4 files changed, 549 insertions(+)
  18  create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-netdev
  19  create mode 100644 drivers/leds/trigger/ledtrig-netdev.c
  20
  21 --- /dev/null
  22 +++ b/Documentation/ABI/testing/sysfs-class-led-trigger-netdev
  23 @@ -0,0 +1,45 @@
  24 +What:          /sys/class/leds/<led>/device_name
  25 +Date:          Dec 2017
  26 +KernelVersion: 4.16
  27 +Contact:       linux-leds@vger.kernel.org
  28 +Description:
  29 +               Specifies the network device name to monitor.
  30 +
  31 +What:          /sys/class/leds/<led>/interval
  32 +Date:          Dec 2017
  33 +KernelVersion: 4.16
  34 +Contact:       linux-leds@vger.kernel.org
  35 +Description:
  36 +               Specifies the duration of the LED blink in milliseconds.
  37 +               Defaults to 50 ms.
  38 +
  39 +What:          /sys/class/leds/<led>/link
  40 +Date:          Dec 2017
  41 +KernelVersion: 4.16
  42 +Contact:       linux-leds@vger.kernel.org
  43 +Description:
  44 +               Signal the link state of the named network device.
  45 +               If set to 0 (default), the LED's normal state is off.
  46 +               If set to 1, the LED's normal state reflects the link state
  47 +               of the named network device.
  48 +               Setting this value also immediately changes the LED state.
  49 +
  50 +What:          /sys/class/leds/<led>/tx
  51 +Date:          Dec 2017
  52 +KernelVersion: 4.16
  53 +Contact:       linux-leds@vger.kernel.org
  54 +Description:
  55 +               Signal transmission of data on the named network device.
  56 +               If set to 0 (default), the LED will not blink on transmission.
  57 +               If set to 1, the LED will blink for the milliseconds specified
  58 +               in interval to signal transmission.
  59 +
  60 +What:          /sys/class/leds/<led>/rx
  61 +Date:          Dec 2017
  62 +KernelVersion: 4.16
  63 +Contact:       linux-leds@vger.kernel.org
  64 +Description:
  65 +               Signal reception of data on the named network device.
  66 +               If set to 0 (default), the LED will not blink on reception.
  67 +               If set to 1, the LED will blink for the milliseconds specified
  68 +               in interval to signal reception.
  69 --- a/drivers/leds/trigger/Kconfig
  70 +++ b/drivers/leds/trigger/Kconfig
  71 @@ -126,4 +126,11 @@ config LEDS_TRIGGER_PANIC
  72           a different trigger.
  73           If unsure, say Y.
  74
  75 +config LEDS_TRIGGER_NETDEV
  76 +       tristate "LED Netdev Trigger"
  77 +       depends on NET && LEDS_TRIGGERS
  78 +       help
  79 +         This allows LEDs to be controlled by network device activity.
  80 +         If unsure, say Y.
  81 +
  82  endif # LEDS_TRIGGERS
  83 --- a/drivers/leds/trigger/Makefile
  84 +++ b/drivers/leds/trigger/Makefile
  85 @@ -11,3 +11,4 @@ obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) +=
  86  obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT)   += ledtrig-transient.o
  87  obj-$(CONFIG_LEDS_TRIGGER_CAMERA)      += ledtrig-camera.o
  88  obj-$(CONFIG_LEDS_TRIGGER_PANIC)       += ledtrig-panic.o
  89 +obj-$(CONFIG_LEDS_TRIGGER_NETDEV)      += ledtrig-netdev.o
  90 --- /dev/null
  91 +++ b/drivers/leds/trigger/ledtrig-netdev.c
  92 @@ -0,0 +1,496 @@
  93 +// SPDX-License-Identifier: GPL-2.0
  94 +// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
  95 +// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
  96 +//
  97 +// LED Kernel Netdev Trigger
  98 +//
  99 +// Toggles the LED to reflect the link and traffic state of a named net device
 100 +//
 101 +// Derived from ledtrig-timer.c which is:
 102 +//  Copyright 2005-2006 Openedhand Ltd.
 103 +//  Author: Richard Purdie <rpurdie@openedhand.com>
 104 +
 105 +#include <linux/atomic.h>
 106 +#include <linux/ctype.h>
 107 +#include <linux/device.h>
 108 +#include <linux/init.h>
 109 +#include <linux/jiffies.h>
 110 +#include <linux/kernel.h>
 111 +#include <linux/leds.h>
 112 +#include <linux/list.h>
 113 +#include <linux/module.h>
 114 +#include <linux/netdevice.h>
 115 +#include <linux/spinlock.h>
 116 +#include <linux/timer.h>
 117 +#include "../leds.h"
 118 +
 119 +/*
 120 + * Configurable sysfs attributes:
 121 + *
 122 + * device_name - network device name to monitor
 123 + * interval - duration of LED blink, in milliseconds
 124 + * link -  LED's normal state reflects whether the link is up
 125 + *         (has carrier) or not
 126 + * tx -  LED blinks on transmitted data
 127 + * rx -  LED blinks on receive data
 128 + *
 129 + */
 130 +
 131 +struct led_netdev_data {
 132 +       spinlock_t lock;
 133 +
 134 +       struct delayed_work work;
 135 +       struct notifier_block notifier;
 136 +
 137 +       struct led_classdev *led_cdev;
 138 +       struct net_device *net_dev;
 139 +
 140 +       char device_name[IFNAMSIZ];
 141 +       atomic_t interval;
 142 +       unsigned int last_activity;
 143 +
 144 +       unsigned long mode;
 145 +#define NETDEV_LED_LINK        0
 146 +#define NETDEV_LED_TX  1
 147 +#define NETDEV_LED_RX  2
 148 +#define NETDEV_LED_MODE_LINKUP 3
 149 +};
 150 +
 151 +enum netdev_led_attr {
 152 +       NETDEV_ATTR_LINK,
 153 +       NETDEV_ATTR_TX,
 154 +       NETDEV_ATTR_RX
 155 +};
 156 +
 157 +static void set_baseline_state(struct led_netdev_data *trigger_data)
 158 +{
 159 +       int current_brightness;
 160 +       struct led_classdev *led_cdev = trigger_data->led_cdev;
 161 +
 162 +       current_brightness = led_cdev->brightness;
 163 +       if (current_brightness)
 164 +               led_cdev->blink_brightness = current_brightness;
 165 +       if (!led_cdev->blink_brightness)
 166 +               led_cdev->blink_brightness = led_cdev->max_brightness;
 167 +
 168 +       if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
 169 +               led_set_brightness(led_cdev, LED_OFF);
 170 +       else {
 171 +               if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
 172 +                       led_set_brightness(led_cdev,
 173 +                                          led_cdev->blink_brightness);
 174 +               else
 175 +                       led_set_brightness(led_cdev, LED_OFF);
 176 +
 177 +               /* If we are looking for RX/TX start periodically
 178 +                * checking stats
 179 +                */
 180 +               if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
 181 +                   test_bit(NETDEV_LED_RX, &trigger_data->mode))
 182 +                       schedule_delayed_work(&trigger_data->work, 0);
 183 +       }
 184 +}
 185 +
 186 +static ssize_t device_name_show(struct device *dev,
 187 +                               struct device_attribute *attr, char *buf)
 188 +{
 189 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 190 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 191 +       ssize_t len;
 192 +
 193 +       spin_lock_bh(&trigger_data->lock);
 194 +       len = sprintf(buf, "%s\n", trigger_data->device_name);
 195 +       spin_unlock_bh(&trigger_data->lock);
 196 +
 197 +       return len;
 198 +}
 199 +
 200 +static ssize_t device_name_store(struct device *dev,
 201 +                                struct device_attribute *attr, const char *buf,
 202 +                                size_t size)
 203 +{
 204 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 205 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 206 +
 207 +       if (size >= IFNAMSIZ)
 208 +               return -EINVAL;
 209 +
 210 +       cancel_delayed_work_sync(&trigger_data->work);
 211 +
 212 +       spin_lock_bh(&trigger_data->lock);
 213 +
 214 +       if (trigger_data->net_dev) {
 215 +               dev_put(trigger_data->net_dev);
 216 +               trigger_data->net_dev = NULL;
 217 +       }
 218 +
 219 +       strncpy(trigger_data->device_name, buf, size);
 220 +       if (size > 0 && trigger_data->device_name[size - 1] == '\n')
 221 +               trigger_data->device_name[size - 1] = 0;
 222 +
 223 +       if (trigger_data->device_name[0] != 0)
 224 +               trigger_data->net_dev =
 225 +                   dev_get_by_name(&init_net, trigger_data->device_name);
 226 +
 227 +       clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
 228 +       if (trigger_data->net_dev != NULL)
 229 +               if (netif_carrier_ok(trigger_data->net_dev))
 230 +                       set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
 231 +
 232 +       trigger_data->last_activity = 0;
 233 +
 234 +       set_baseline_state(trigger_data);
 235 +       spin_unlock_bh(&trigger_data->lock);
 236 +
 237 +       return size;
 238 +}
 239 +
 240 +static DEVICE_ATTR_RW(device_name);
 241 +
 242 +static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
 243 +       enum netdev_led_attr attr)
 244 +{
 245 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 246 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 247 +       int bit;
 248 +
 249 +       switch (attr) {
 250 +       case NETDEV_ATTR_LINK:
 251 +               bit = NETDEV_LED_LINK;
 252 +               break;
 253 +       case NETDEV_ATTR_TX:
 254 +               bit = NETDEV_LED_TX;
 255 +               break;
 256 +       case NETDEV_ATTR_RX:
 257 +               bit = NETDEV_LED_RX;
 258 +               break;
 259 +       default:
 260 +               return -EINVAL;
 261 +       }
 262 +
 263 +       return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
 264 +}
 265 +
 266 +static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
 267 +       size_t size, enum netdev_led_attr attr)
 268 +{
 269 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 270 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 271 +       unsigned long state;
 272 +       int ret;
 273 +       int bit;
 274 +
 275 +       ret = kstrtoul(buf, 0, &state);
 276 +       if (ret)
 277 +               return ret;
 278 +
 279 +       switch (attr) {
 280 +       case NETDEV_ATTR_LINK:
 281 +               bit = NETDEV_LED_LINK;
 282 +               break;
 283 +       case NETDEV_ATTR_TX:
 284 +               bit = NETDEV_LED_TX;
 285 +               break;
 286 +       case NETDEV_ATTR_RX:
 287 +               bit = NETDEV_LED_RX;
 288 +               break;
 289 +       default:
 290 +               return -EINVAL;
 291 +       }
 292 +
 293 +       cancel_delayed_work_sync(&trigger_data->work);
 294 +
 295 +       if (state)
 296 +               set_bit(bit, &trigger_data->mode);
 297 +       else
 298 +               clear_bit(bit, &trigger_data->mode);
 299 +
 300 +       set_baseline_state(trigger_data);
 301 +
 302 +       return size;
 303 +}
 304 +
 305 +static ssize_t link_show(struct device *dev,
 306 +       struct device_attribute *attr, char *buf)
 307 +{
 308 +       return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
 309 +}
 310 +
 311 +static ssize_t link_store(struct device *dev,
 312 +       struct device_attribute *attr, const char *buf, size_t size)
 313 +{
 314 +       return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
 315 +}
 316 +
 317 +static DEVICE_ATTR_RW(link);
 318 +
 319 +static ssize_t tx_show(struct device *dev,
 320 +       struct device_attribute *attr, char *buf)
 321 +{
 322 +       return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
 323 +}
 324 +
 325 +static ssize_t tx_store(struct device *dev,
 326 +       struct device_attribute *attr, const char *buf, size_t size)
 327 +{
 328 +       return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
 329 +}
 330 +
 331 +static DEVICE_ATTR_RW(tx);
 332 +
 333 +static ssize_t rx_show(struct device *dev,
 334 +       struct device_attribute *attr, char *buf)
 335 +{
 336 +       return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
 337 +}
 338 +
 339 +static ssize_t rx_store(struct device *dev,
 340 +       struct device_attribute *attr, const char *buf, size_t size)
 341 +{
 342 +       return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
 343 +}
 344 +
 345 +static DEVICE_ATTR_RW(rx);
 346 +
 347 +static ssize_t interval_show(struct device *dev,
 348 +                            struct device_attribute *attr, char *buf)
 349 +{
 350 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 351 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 352 +
 353 +       return sprintf(buf, "%u\n",
 354 +                      jiffies_to_msecs(atomic_read(&trigger_data->interval)));
 355 +}
 356 +
 357 +static ssize_t interval_store(struct device *dev,
 358 +                             struct device_attribute *attr, const char *buf,
 359 +                             size_t size)
 360 +{
 361 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 362 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 363 +       unsigned long value;
 364 +       int ret;
 365 +
 366 +       ret = kstrtoul(buf, 0, &value);
 367 +       if (ret)
 368 +               return ret;
 369 +
 370 +       /* impose some basic bounds on the timer interval */
 371 +       if (value >= 5 && value <= 10000) {
 372 +               cancel_delayed_work_sync(&trigger_data->work);
 373 +
 374 +               atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
 375 +               set_baseline_state(trigger_data);       /* resets timer */
 376 +       }
 377 +
 378 +       return size;
 379 +}
 380 +
 381 +static DEVICE_ATTR_RW(interval);
 382 +
 383 +static int netdev_trig_notify(struct notifier_block *nb,
 384 +                             unsigned long evt, void *dv)
 385 +{
 386 +       struct net_device *dev =
 387 +               netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
 388 +       struct led_netdev_data *trigger_data = container_of(nb,
 389 +                                                           struct
 390 +                                                           led_netdev_data,
 391 +                                                           notifier);
 392 +
 393 +       if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
 394 +           && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
 395 +           && evt != NETDEV_CHANGENAME)
 396 +               return NOTIFY_DONE;
 397 +
 398 +       if (strcmp(dev->name, trigger_data->device_name))
 399 +               return NOTIFY_DONE;
 400 +
 401 +       cancel_delayed_work_sync(&trigger_data->work);
 402 +
 403 +       spin_lock_bh(&trigger_data->lock);
 404 +
 405 +       clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
 406 +       switch (evt) {
 407 +       case NETDEV_REGISTER:
 408 +               if (trigger_data->net_dev)
 409 +                       dev_put(trigger_data->net_dev);
 410 +               dev_hold(dev);
 411 +               trigger_data->net_dev = dev;
 412 +               break;
 413 +       case NETDEV_CHANGENAME:
 414 +       case NETDEV_UNREGISTER:
 415 +               if (trigger_data->net_dev) {
 416 +                       dev_put(trigger_data->net_dev);
 417 +                       trigger_data->net_dev = NULL;
 418 +               }
 419 +               break;
 420 +       case NETDEV_UP:
 421 +       case NETDEV_CHANGE:
 422 +               if (netif_carrier_ok(dev))
 423 +                       set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
 424 +               break;
 425 +       }
 426 +
 427 +       set_baseline_state(trigger_data);
 428 +
 429 +       spin_unlock_bh(&trigger_data->lock);
 430 +
 431 +       return NOTIFY_DONE;
 432 +}
 433 +
 434 +/* here's the real work! */
 435 +static void netdev_trig_work(struct work_struct *work)
 436 +{
 437 +       struct led_netdev_data *trigger_data = container_of(work,
 438 +                                                           struct
 439 +                                                           led_netdev_data,
 440 +                                                           work.work);
 441 +       struct rtnl_link_stats64 *dev_stats;
 442 +       unsigned int new_activity;
 443 +       struct rtnl_link_stats64 temp;
 444 +       unsigned long interval;
 445 +       int invert;
 446 +
 447 +       /* If we dont have a device, insure we are off */
 448 +       if (!trigger_data->net_dev) {
 449 +               led_set_brightness(trigger_data->led_cdev, LED_OFF);
 450 +               return;
 451 +       }
 452 +
 453 +       /* If we are not looking for RX/TX then return  */
 454 +       if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
 455 +           !test_bit(NETDEV_LED_RX, &trigger_data->mode))
 456 +               return;
 457 +
 458 +       dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
 459 +       new_activity =
 460 +           (test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
 461 +               dev_stats->tx_packets : 0) +
 462 +           (test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
 463 +               dev_stats->rx_packets : 0);
 464 +
 465 +       if (trigger_data->last_activity != new_activity) {
 466 +               led_stop_software_blink(trigger_data->led_cdev);
 467 +
 468 +               invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
 469 +               interval = jiffies_to_msecs(
 470 +                               atomic_read(&trigger_data->interval));
 471 +               /* base state is ON (link present) */
 472 +               led_blink_set_oneshot(trigger_data->led_cdev,
 473 +                                     &interval,
 474 +                                     &interval,
 475 +                                     invert);
 476 +               trigger_data->last_activity = new_activity;
 477 +       }
 478 +
 479 +       schedule_delayed_work(&trigger_data->work,
 480 +                       (atomic_read(&trigger_data->interval)*2));
 481 +}
 482 +
 483 +static void netdev_trig_activate(struct led_classdev *led_cdev)
 484 +{
 485 +       struct led_netdev_data *trigger_data;
 486 +       int rc;
 487 +
 488 +       trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
 489 +       if (!trigger_data)
 490 +               return;
 491 +
 492 +       spin_lock_init(&trigger_data->lock);
 493 +
 494 +       trigger_data->notifier.notifier_call = netdev_trig_notify;
 495 +       trigger_data->notifier.priority = 10;
 496 +
 497 +       INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
 498 +
 499 +       trigger_data->led_cdev = led_cdev;
 500 +       trigger_data->net_dev = NULL;
 501 +       trigger_data->device_name[0] = 0;
 502 +
 503 +       trigger_data->mode = 0;
 504 +       atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
 505 +       trigger_data->last_activity = 0;
 506 +
 507 +       led_cdev->trigger_data = trigger_data;
 508 +
 509 +       rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
 510 +       if (rc)
 511 +               goto err_out;
 512 +       rc = device_create_file(led_cdev->dev, &dev_attr_link);
 513 +       if (rc)
 514 +               goto err_out_device_name;
 515 +       rc = device_create_file(led_cdev->dev, &dev_attr_rx);
 516 +       if (rc)
 517 +               goto err_out_link;
 518 +       rc = device_create_file(led_cdev->dev, &dev_attr_tx);
 519 +       if (rc)
 520 +               goto err_out_rx;
 521 +       rc = device_create_file(led_cdev->dev, &dev_attr_interval);
 522 +       if (rc)
 523 +               goto err_out_tx;
 524 +       rc = register_netdevice_notifier(&trigger_data->notifier);
 525 +       if (rc)
 526 +               goto err_out_interval;
 527 +       return;
 528 +
 529 +err_out_interval:
 530 +       device_remove_file(led_cdev->dev, &dev_attr_interval);
 531 +err_out_tx:
 532 +       device_remove_file(led_cdev->dev, &dev_attr_tx);
 533 +err_out_rx:
 534 +       device_remove_file(led_cdev->dev, &dev_attr_rx);
 535 +err_out_link:
 536 +       device_remove_file(led_cdev->dev, &dev_attr_link);
 537 +err_out_device_name:
 538 +       device_remove_file(led_cdev->dev, &dev_attr_device_name);
 539 +err_out:
 540 +       led_cdev->trigger_data = NULL;
 541 +       kfree(trigger_data);
 542 +}
 543 +
 544 +static void netdev_trig_deactivate(struct led_classdev *led_cdev)
 545 +{
 546 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 547 +
 548 +       if (trigger_data) {
 549 +               unregister_netdevice_notifier(&trigger_data->notifier);
 550 +
 551 +               device_remove_file(led_cdev->dev, &dev_attr_device_name);
 552 +               device_remove_file(led_cdev->dev, &dev_attr_link);
 553 +               device_remove_file(led_cdev->dev, &dev_attr_rx);
 554 +               device_remove_file(led_cdev->dev, &dev_attr_tx);
 555 +               device_remove_file(led_cdev->dev, &dev_attr_interval);
 556 +
 557 +               cancel_delayed_work_sync(&trigger_data->work);
 558 +
 559 +               if (trigger_data->net_dev)
 560 +                       dev_put(trigger_data->net_dev);
 561 +
 562 +               kfree(trigger_data);
 563 +       }
 564 +}
 565 +
 566 +static struct led_trigger netdev_led_trigger = {
 567 +       .name = "netdev",
 568 +       .activate = netdev_trig_activate,
 569 +       .deactivate = netdev_trig_deactivate,
 570 +};
 571 +
 572 +static int __init netdev_trig_init(void)
 573 +{
 574 +       return led_trigger_register(&netdev_led_trigger);
 575 +}
 576 +
 577 +static void __exit netdev_trig_exit(void)
 578 +{
 579 +       led_trigger_unregister(&netdev_led_trigger);
 580 +}
 581 +
 582 +module_init(netdev_trig_init);
 583 +module_exit(netdev_trig_exit);
 584 +
 585 +MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
 586 +MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
 587 +MODULE_DESCRIPTION("Netdev LED trigger");
 588 +MODULE_LICENSE("GPL v2");