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1// SPDX-License-Identifier: GPL-2.02// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>3// Copyright 2007 Oliver Jowett <oliver@opencloud.com>4//5// LED Kernel Netdev Trigger6//7// Toggles the LED to reflect the link and traffic state of a named net device8//9// Derived from ledtrig-timer.c which is:10// Copyright 2005-2006 Openedhand Ltd.11// Author: Richard Purdie <rpurdie@openedhand.com>12 13#include <linux/atomic.h>14#include <linux/ctype.h>15#include <linux/device.h>16#include <linux/ethtool.h>17#include <linux/init.h>18#include <linux/jiffies.h>19#include <linux/kernel.h>20#include <linux/leds.h>21#include <linux/linkmode.h>22#include <linux/list.h>23#include <linux/module.h>24#include <linux/netdevice.h>25#include <linux/mutex.h>26#include <linux/phy.h>27#include <linux/rtnetlink.h>28#include <linux/timer.h>29#include "../leds.h"30 31#define NETDEV_LED_DEFAULT_INTERVAL 5032 33/*34 * Configurable sysfs attributes:35 *36 * device_name - network device name to monitor37 * interval - duration of LED blink, in milliseconds38 * link - LED's normal state reflects whether the link is up39 * (has carrier) or not40 * tx - LED blinks on transmitted data41 * rx - LED blinks on receive data42 * tx_err - LED blinks on transmit error43 * rx_err - LED blinks on receive error44 *45 * Note: If the user selects a mode that is not supported by hw, default46 * behavior is to fall back to software control of the LED. However not every47 * hw supports software control. LED callbacks brightness_set() and48 * brightness_set_blocking() are NULL in this case. hw_control_is_supported()49 * should use available means supported by hw to inform the user that selected50 * mode isn't supported by hw. This could be switching off the LED or any51 * hw blink mode. If software control fallback isn't possible, we return52 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed53 * in case an intermediate unsupported mode is necessary to switch from one54 * supported mode to another.55 */56 57struct led_netdev_data {58 struct mutex lock;59 60 struct delayed_work work;61 struct notifier_block notifier;62 63 struct led_classdev *led_cdev;64 struct net_device *net_dev;65 66 char device_name[IFNAMSIZ];67 atomic_t interval;68 unsigned int last_activity;69 70 unsigned long mode;71 int link_speed;72 __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes);73 u8 duplex;74 75 bool carrier_link_up;76 bool hw_control;77};78 79static const struct attribute_group netdev_trig_link_speed_attrs_group;80 81static void set_baseline_state(struct led_netdev_data *trigger_data)82{83 int current_brightness;84 struct led_classdev *led_cdev = trigger_data->led_cdev;85 86 /* Already validated, hw control is possible with the requested mode */87 if (trigger_data->hw_control) {88 led_cdev->hw_control_set(led_cdev, trigger_data->mode);89 90 return;91 }92 93 current_brightness = led_cdev->brightness;94 if (current_brightness)95 led_cdev->blink_brightness = current_brightness;96 if (!led_cdev->blink_brightness)97 led_cdev->blink_brightness = led_cdev->max_brightness;98 99 if (!trigger_data->carrier_link_up) {100 led_set_brightness(led_cdev, LED_OFF);101 } else {102 bool blink_on = false;103 104 if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode))105 blink_on = true;106 107 if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) &&108 trigger_data->link_speed == SPEED_10)109 blink_on = true;110 111 if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) &&112 trigger_data->link_speed == SPEED_100)113 blink_on = true;114 115 if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) &&116 trigger_data->link_speed == SPEED_1000)117 blink_on = true;118 119 if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) &&120 trigger_data->link_speed == SPEED_2500)121 blink_on = true;122 123 if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) &&124 trigger_data->link_speed == SPEED_5000)125 blink_on = true;126 127 if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) &&128 trigger_data->link_speed == SPEED_10000)129 blink_on = true;130 131 if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) &&132 trigger_data->duplex == DUPLEX_HALF)133 blink_on = true;134 135 if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) &&136 trigger_data->duplex == DUPLEX_FULL)137 blink_on = true;138 139 if (blink_on)140 led_set_brightness(led_cdev,141 led_cdev->blink_brightness);142 else143 led_set_brightness(led_cdev, LED_OFF);144 145 /* If we are looking for RX/TX start periodically146 * checking stats147 */148 if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ||149 test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ||150 test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ||151 test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode))152 schedule_delayed_work(&trigger_data->work, 0);153 }154}155 156static bool supports_hw_control(struct led_classdev *led_cdev)157{158 if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||159 !led_cdev->hw_control_is_supported)160 return false;161 162 return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);163}164 165/*166 * Validate the configured netdev is the same as the one associated with167 * the LED driver in hw control.168 */169static bool validate_net_dev(struct led_classdev *led_cdev,170 struct net_device *net_dev)171{172 struct device *dev = led_cdev->hw_control_get_device(led_cdev);173 struct net_device *ndev;174 175 if (!dev)176 return false;177 178 ndev = to_net_dev(dev);179 180 return ndev == net_dev;181}182 183static bool can_hw_control(struct led_netdev_data *trigger_data)184{185 unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);186 unsigned int interval = atomic_read(&trigger_data->interval);187 struct led_classdev *led_cdev = trigger_data->led_cdev;188 int ret;189 190 if (!supports_hw_control(led_cdev))191 return false;192 193 /*194 * Interval must be set to the default195 * value. Any different value is rejected if in hw196 * control.197 */198 if (interval != default_interval)199 return false;200 201 /*202 * net_dev must be set with hw control, otherwise no203 * blinking can be happening and there is nothing to204 * offloaded. Additionally, for hw control to be205 * valid, the configured netdev must be the same as206 * netdev associated to the LED.207 */208 if (!validate_net_dev(led_cdev, trigger_data->net_dev))209 return false;210 211 /* Check if the requested mode is supported */212 ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);213 /* Fall back to software blinking if not supported */214 if (ret == -EOPNOTSUPP)215 return false;216 if (ret) {217 dev_warn(led_cdev->dev,218 "Current mode check failed with error %d\n", ret);219 return false;220 }221 222 return true;223}224 225static void get_device_state(struct led_netdev_data *trigger_data)226{227 struct ethtool_link_ksettings cmd;228 229 trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);230 231 if (__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd))232 return;233 234 if (trigger_data->carrier_link_up) {235 trigger_data->link_speed = cmd.base.speed;236 trigger_data->duplex = cmd.base.duplex;237 }238 239 /*240 * Have a local copy of the link speed supported to avoid rtnl lock every time241 * modes are refreshed on any change event242 */243 linkmode_copy(trigger_data->supported_link_modes, cmd.link_modes.supported);244}245 246static ssize_t device_name_show(struct device *dev,247 struct device_attribute *attr, char *buf)248{249 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);250 ssize_t len;251 252 mutex_lock(&trigger_data->lock);253 len = sprintf(buf, "%s\n", trigger_data->device_name);254 mutex_unlock(&trigger_data->lock);255 256 return len;257}258 259static int set_device_name(struct led_netdev_data *trigger_data,260 const char *name, size_t size)261{262 if (size >= IFNAMSIZ)263 return -EINVAL;264 265 cancel_delayed_work_sync(&trigger_data->work);266 267 /*268 * Take RTNL lock before trigger_data lock to prevent potential269 * deadlock with netdev notifier registration.270 */271 rtnl_lock();272 mutex_lock(&trigger_data->lock);273 274 if (trigger_data->net_dev) {275 dev_put(trigger_data->net_dev);276 trigger_data->net_dev = NULL;277 }278 279 memcpy(trigger_data->device_name, name, size);280 trigger_data->device_name[size] = 0;281 if (size > 0 && trigger_data->device_name[size - 1] == '\n')282 trigger_data->device_name[size - 1] = 0;283 284 if (trigger_data->device_name[0] != 0)285 trigger_data->net_dev =286 dev_get_by_name(&init_net, trigger_data->device_name);287 288 trigger_data->carrier_link_up = false;289 trigger_data->link_speed = SPEED_UNKNOWN;290 trigger_data->duplex = DUPLEX_UNKNOWN;291 if (trigger_data->net_dev)292 get_device_state(trigger_data);293 294 trigger_data->last_activity = 0;295 296 /* Skip if we're called from netdev_trig_activate() and hw_control is true */297 if (!trigger_data->hw_control || led_get_trigger_data(trigger_data->led_cdev))298 set_baseline_state(trigger_data);299 300 mutex_unlock(&trigger_data->lock);301 rtnl_unlock();302 303 return 0;304}305 306static ssize_t device_name_store(struct device *dev,307 struct device_attribute *attr, const char *buf,308 size_t size)309{310 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);311 int ret;312 313 ret = set_device_name(trigger_data, buf, size);314 315 if (ret < 0)316 return ret;317 318 /* Refresh link_speed visibility */319 sysfs_update_group(&dev->kobj, &netdev_trig_link_speed_attrs_group);320 321 return size;322}323 324static DEVICE_ATTR_RW(device_name);325 326static ssize_t netdev_led_attr_show(struct device *dev, char *buf,327 enum led_trigger_netdev_modes attr)328{329 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);330 int bit;331 332 switch (attr) {333 case TRIGGER_NETDEV_LINK:334 case TRIGGER_NETDEV_LINK_10:335 case TRIGGER_NETDEV_LINK_100:336 case TRIGGER_NETDEV_LINK_1000:337 case TRIGGER_NETDEV_LINK_2500:338 case TRIGGER_NETDEV_LINK_5000:339 case TRIGGER_NETDEV_LINK_10000:340 case TRIGGER_NETDEV_HALF_DUPLEX:341 case TRIGGER_NETDEV_FULL_DUPLEX:342 case TRIGGER_NETDEV_TX:343 case TRIGGER_NETDEV_RX:344 case TRIGGER_NETDEV_TX_ERR:345 case TRIGGER_NETDEV_RX_ERR:346 bit = attr;347 break;348 default:349 return -EINVAL;350 }351 352 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));353}354 355static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,356 size_t size, enum led_trigger_netdev_modes attr)357{358 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);359 struct led_classdev *led_cdev = trigger_data->led_cdev;360 unsigned long state, mode = trigger_data->mode;361 int ret;362 int bit;363 364 ret = kstrtoul(buf, 0, &state);365 if (ret)366 return ret;367 368 switch (attr) {369 case TRIGGER_NETDEV_LINK:370 case TRIGGER_NETDEV_LINK_10:371 case TRIGGER_NETDEV_LINK_100:372 case TRIGGER_NETDEV_LINK_1000:373 case TRIGGER_NETDEV_LINK_2500:374 case TRIGGER_NETDEV_LINK_5000:375 case TRIGGER_NETDEV_LINK_10000:376 case TRIGGER_NETDEV_HALF_DUPLEX:377 case TRIGGER_NETDEV_FULL_DUPLEX:378 case TRIGGER_NETDEV_TX:379 case TRIGGER_NETDEV_RX:380 case TRIGGER_NETDEV_TX_ERR:381 case TRIGGER_NETDEV_RX_ERR:382 bit = attr;383 break;384 default:385 return -EINVAL;386 }387 388 if (state)389 set_bit(bit, &mode);390 else391 clear_bit(bit, &mode);392 393 if (test_bit(TRIGGER_NETDEV_LINK, &mode) &&394 (test_bit(TRIGGER_NETDEV_LINK_10, &mode) ||395 test_bit(TRIGGER_NETDEV_LINK_100, &mode) ||396 test_bit(TRIGGER_NETDEV_LINK_1000, &mode) ||397 test_bit(TRIGGER_NETDEV_LINK_2500, &mode) ||398 test_bit(TRIGGER_NETDEV_LINK_5000, &mode) ||399 test_bit(TRIGGER_NETDEV_LINK_10000, &mode)))400 return -EINVAL;401 402 cancel_delayed_work_sync(&trigger_data->work);403 404 trigger_data->mode = mode;405 trigger_data->hw_control = can_hw_control(trigger_data);406 407 if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking &&408 !trigger_data->hw_control)409 return -EOPNOTSUPP;410 411 set_baseline_state(trigger_data);412 413 return size;414}415 416#define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \417 static ssize_t trigger_name##_show(struct device *dev, \418 struct device_attribute *attr, char *buf) \419 { \420 return netdev_led_attr_show(dev, buf, trigger); \421 } \422 static ssize_t trigger_name##_store(struct device *dev, \423 struct device_attribute *attr, const char *buf, size_t size) \424 { \425 return netdev_led_attr_store(dev, buf, size, trigger); \426 } \427 static DEVICE_ATTR_RW(trigger_name)428 429DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);430DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);431DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);432DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);433DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500);434DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000);435DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000);436DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);437DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);438DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);439DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);440DEFINE_NETDEV_TRIGGER(tx_err, TRIGGER_NETDEV_TX_ERR);441DEFINE_NETDEV_TRIGGER(rx_err, TRIGGER_NETDEV_RX_ERR);442 443static ssize_t interval_show(struct device *dev,444 struct device_attribute *attr, char *buf)445{446 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);447 448 return sprintf(buf, "%u\n",449 jiffies_to_msecs(atomic_read(&trigger_data->interval)));450}451 452static ssize_t interval_store(struct device *dev,453 struct device_attribute *attr, const char *buf,454 size_t size)455{456 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);457 unsigned long value;458 int ret;459 460 if (trigger_data->hw_control)461 return -EINVAL;462 463 ret = kstrtoul(buf, 0, &value);464 if (ret)465 return ret;466 467 /* impose some basic bounds on the timer interval */468 if (value >= 5 && value <= 10000) {469 cancel_delayed_work_sync(&trigger_data->work);470 471 atomic_set(&trigger_data->interval, msecs_to_jiffies(value));472 set_baseline_state(trigger_data); /* resets timer */473 }474 475 return size;476}477 478static DEVICE_ATTR_RW(interval);479 480static ssize_t offloaded_show(struct device *dev,481 struct device_attribute *attr, char *buf)482{483 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);484 485 return sprintf(buf, "%d\n", trigger_data->hw_control);486}487 488static DEVICE_ATTR_RO(offloaded);489 490#define CHECK_LINK_MODE_ATTR(link_speed) \491 do { \492 if (attr == &dev_attr_link_##link_speed.attr && \493 link_ksettings.base.speed == SPEED_##link_speed) \494 return attr->mode; \495 } while (0)496 497static umode_t netdev_trig_link_speed_visible(struct kobject *kobj,498 struct attribute *attr, int n)499{500 struct device *dev = kobj_to_dev(kobj);501 struct led_netdev_data *trigger_data;502 unsigned long *supported_link_modes;503 u32 mode;504 505 trigger_data = led_trigger_get_drvdata(dev);506 supported_link_modes = trigger_data->supported_link_modes;507 508 /*509 * Search in the supported link mode mask a matching supported mode.510 * Stop at the first matching entry as we care only to check if a particular511 * speed is supported and not the kind.512 */513 for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) {514 struct ethtool_link_ksettings link_ksettings;515 516 ethtool_params_from_link_mode(&link_ksettings, mode);517 518 CHECK_LINK_MODE_ATTR(10);519 CHECK_LINK_MODE_ATTR(100);520 CHECK_LINK_MODE_ATTR(1000);521 CHECK_LINK_MODE_ATTR(2500);522 CHECK_LINK_MODE_ATTR(5000);523 CHECK_LINK_MODE_ATTR(10000);524 }525 526 return 0;527}528 529static struct attribute *netdev_trig_link_speed_attrs[] = {530 &dev_attr_link_10.attr,531 &dev_attr_link_100.attr,532 &dev_attr_link_1000.attr,533 &dev_attr_link_2500.attr,534 &dev_attr_link_5000.attr,535 &dev_attr_link_10000.attr,536 NULL537};538 539static const struct attribute_group netdev_trig_link_speed_attrs_group = {540 .attrs = netdev_trig_link_speed_attrs,541 .is_visible = netdev_trig_link_speed_visible,542};543 544static struct attribute *netdev_trig_attrs[] = {545 &dev_attr_device_name.attr,546 &dev_attr_link.attr,547 &dev_attr_full_duplex.attr,548 &dev_attr_half_duplex.attr,549 &dev_attr_rx.attr,550 &dev_attr_tx.attr,551 &dev_attr_rx_err.attr,552 &dev_attr_tx_err.attr,553 &dev_attr_interval.attr,554 &dev_attr_offloaded.attr,555 NULL556};557 558static const struct attribute_group netdev_trig_attrs_group = {559 .attrs = netdev_trig_attrs,560};561 562static const struct attribute_group *netdev_trig_groups[] = {563 &netdev_trig_attrs_group,564 &netdev_trig_link_speed_attrs_group,565 NULL,566};567 568static int netdev_trig_notify(struct notifier_block *nb,569 unsigned long evt, void *dv)570{571 struct net_device *dev =572 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);573 struct led_netdev_data *trigger_data =574 container_of(nb, struct led_netdev_data, notifier);575 struct led_classdev *led_cdev = trigger_data->led_cdev;576 577 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE578 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER579 && evt != NETDEV_CHANGENAME)580 return NOTIFY_DONE;581 582 if (!(dev == trigger_data->net_dev ||583 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||584 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))585 return NOTIFY_DONE;586 587 cancel_delayed_work_sync(&trigger_data->work);588 589 mutex_lock(&trigger_data->lock);590 591 trigger_data->carrier_link_up = false;592 trigger_data->link_speed = SPEED_UNKNOWN;593 trigger_data->duplex = DUPLEX_UNKNOWN;594 switch (evt) {595 case NETDEV_CHANGENAME:596 case NETDEV_REGISTER:597 dev_put(trigger_data->net_dev);598 dev_hold(dev);599 trigger_data->net_dev = dev;600 if (evt == NETDEV_CHANGENAME)601 get_device_state(trigger_data);602 break;603 case NETDEV_UNREGISTER:604 dev_put(trigger_data->net_dev);605 trigger_data->net_dev = NULL;606 break;607 case NETDEV_UP:608 case NETDEV_CHANGE:609 get_device_state(trigger_data);610 /* Refresh link_speed visibility */611 if (evt == NETDEV_CHANGE)612 sysfs_update_group(&led_cdev->dev->kobj,613 &netdev_trig_link_speed_attrs_group);614 break;615 }616 617 set_baseline_state(trigger_data);618 619 mutex_unlock(&trigger_data->lock);620 621 return NOTIFY_DONE;622}623 624/* here's the real work! */625static void netdev_trig_work(struct work_struct *work)626{627 struct led_netdev_data *trigger_data =628 container_of(work, struct led_netdev_data, work.work);629 struct rtnl_link_stats64 *dev_stats;630 unsigned int new_activity;631 struct rtnl_link_stats64 temp;632 unsigned long interval;633 int invert;634 635 /* If we dont have a device, insure we are off */636 if (!trigger_data->net_dev) {637 led_set_brightness(trigger_data->led_cdev, LED_OFF);638 return;639 }640 641 /* If we are not looking for RX/TX then return */642 if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) &&643 !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) &&644 !test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) &&645 !test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode))646 return;647 648 dev_stats = dev_get_stats(trigger_data->net_dev, &temp);649 new_activity =650 (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ?651 dev_stats->tx_packets : 0) +652 (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ?653 dev_stats->rx_packets : 0) +654 (test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ?655 dev_stats->tx_errors : 0) +656 (test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode) ?657 dev_stats->rx_errors : 0);658 659 if (trigger_data->last_activity != new_activity) {660 led_stop_software_blink(trigger_data->led_cdev);661 662 invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) ||663 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) ||664 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) ||665 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) ||666 test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) ||667 test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) ||668 test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) ||669 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) ||670 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode);671 interval = jiffies_to_msecs(672 atomic_read(&trigger_data->interval));673 /* base state is ON (link present) */674 led_blink_set_oneshot(trigger_data->led_cdev,675 &interval,676 &interval,677 invert);678 trigger_data->last_activity = new_activity;679 }680 681 schedule_delayed_work(&trigger_data->work,682 (atomic_read(&trigger_data->interval)*2));683}684 685static int netdev_trig_activate(struct led_classdev *led_cdev)686{687 struct led_netdev_data *trigger_data;688 unsigned long mode = 0;689 struct device *dev;690 int rc;691 692 trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);693 if (!trigger_data)694 return -ENOMEM;695 696 mutex_init(&trigger_data->lock);697 698 trigger_data->notifier.notifier_call = netdev_trig_notify;699 trigger_data->notifier.priority = 10;700 701 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);702 703 trigger_data->led_cdev = led_cdev;704 trigger_data->net_dev = NULL;705 trigger_data->device_name[0] = 0;706 707 trigger_data->mode = 0;708 atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));709 trigger_data->last_activity = 0;710 711 /* Check if hw control is active by default on the LED.712 * Init already enabled mode in hw control.713 */714 if (supports_hw_control(led_cdev)) {715 dev = led_cdev->hw_control_get_device(led_cdev);716 if (dev) {717 const char *name = dev_name(dev);718 719 trigger_data->hw_control = true;720 set_device_name(trigger_data, name, strlen(name));721 722 rc = led_cdev->hw_control_get(led_cdev, &mode);723 if (!rc)724 trigger_data->mode = mode;725 }726 }727 728 led_set_trigger_data(led_cdev, trigger_data);729 730 rc = register_netdevice_notifier(&trigger_data->notifier);731 if (rc)732 kfree(trigger_data);733 734 return rc;735}736 737static void netdev_trig_deactivate(struct led_classdev *led_cdev)738{739 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);740 741 unregister_netdevice_notifier(&trigger_data->notifier);742 743 cancel_delayed_work_sync(&trigger_data->work);744 745 dev_put(trigger_data->net_dev);746 747 kfree(trigger_data);748}749 750static struct led_trigger netdev_led_trigger = {751 .name = "netdev",752 .activate = netdev_trig_activate,753 .deactivate = netdev_trig_deactivate,754 .groups = netdev_trig_groups,755};756 757module_led_trigger(netdev_led_trigger);758 759MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");760MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");761MODULE_DESCRIPTION("Netdev LED trigger");762MODULE_LICENSE("GPL v2");763MODULE_ALIAS("ledtrig:netdev");764