1// SPDX-License-Identifier: GPL-2.0
2// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
3// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
4//
5// LED Kernel Netdev Trigger
6//
7// Toggles the LED to reflect the link and traffic state of a named net device
8//
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 50
32
33/*
34 * Configurable sysfs attributes:
35 *
36 * device_name - network device name to monitor
37 * interval - duration of LED blink, in milliseconds
38 * link - LED's normal state reflects whether the link is up
39 * (has carrier) or not
40 * tx - LED blinks on transmitted data
41 * rx - LED blinks on receive data
42 *
43 * Note: If the user selects a mode that is not supported by hw, default
44 * behavior is to fall back to software control of the LED. However not every
45 * hw supports software control. LED callbacks brightness_set() and
46 * brightness_set_blocking() are NULL in this case. hw_control_is_supported()
47 * should use available means supported by hw to inform the user that selected
48 * mode isn't supported by hw. This could be switching off the LED or any
49 * hw blink mode. If software control fallback isn't possible, we return
50 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed
51 * in case an intermediate unsupported mode is necessary to switch from one
52 * supported mode to another.
53 */
54
55struct led_netdev_data {
56 struct mutex lock;
57
58 struct delayed_work work;
59 struct notifier_block notifier;
60
61 struct led_classdev *led_cdev;
62 struct net_device *net_dev;
63
64 char device_name[IFNAMSIZ];
65 atomic_t interval;
66 unsigned int last_activity;
67
68 unsigned long mode;
69 int link_speed;
70 __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes);
71 u8 duplex;
72
73 bool carrier_link_up;
74 bool hw_control;
75};
76
77static const struct attribute_group netdev_trig_link_speed_attrs_group;
78
79static void set_baseline_state(struct led_netdev_data *trigger_data)
80{
81 int current_brightness;
82 struct led_classdev *led_cdev = trigger_data->led_cdev;
83
84 /* Already validated, hw control is possible with the requested mode */
85 if (trigger_data->hw_control) {
86 led_cdev->hw_control_set(led_cdev, trigger_data->mode);
87
88 return;
89 }
90
91 current_brightness = led_cdev->brightness;
92 if (current_brightness)
93 led_cdev->blink_brightness = current_brightness;
94 if (!led_cdev->blink_brightness)
95 led_cdev->blink_brightness = led_cdev->max_brightness;
96
97 if (!trigger_data->carrier_link_up) {
98 led_set_brightness(led_cdev, brightness: LED_OFF);
99 } else {
100 bool blink_on = false;
101
102 if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode))
103 blink_on = true;
104
105 if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) &&
106 trigger_data->link_speed == SPEED_10)
107 blink_on = true;
108
109 if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) &&
110 trigger_data->link_speed == SPEED_100)
111 blink_on = true;
112
113 if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) &&
114 trigger_data->link_speed == SPEED_1000)
115 blink_on = true;
116
117 if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) &&
118 trigger_data->link_speed == SPEED_2500)
119 blink_on = true;
120
121 if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) &&
122 trigger_data->link_speed == SPEED_5000)
123 blink_on = true;
124
125 if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) &&
126 trigger_data->link_speed == SPEED_10000)
127 blink_on = true;
128
129 if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) &&
130 trigger_data->duplex == DUPLEX_HALF)
131 blink_on = true;
132
133 if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) &&
134 trigger_data->duplex == DUPLEX_FULL)
135 blink_on = true;
136
137 if (blink_on)
138 led_set_brightness(led_cdev,
139 brightness: led_cdev->blink_brightness);
140 else
141 led_set_brightness(led_cdev, brightness: LED_OFF);
142
143 /* If we are looking for RX/TX start periodically
144 * checking stats
145 */
146 if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ||
147 test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode))
148 schedule_delayed_work(dwork: &trigger_data->work, delay: 0);
149 }
150}
151
152static bool supports_hw_control(struct led_classdev *led_cdev)
153{
154 if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
155 !led_cdev->hw_control_is_supported)
156 return false;
157
158 return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
159}
160
161/*
162 * Validate the configured netdev is the same as the one associated with
163 * the LED driver in hw control.
164 */
165static bool validate_net_dev(struct led_classdev *led_cdev,
166 struct net_device *net_dev)
167{
168 struct device *dev = led_cdev->hw_control_get_device(led_cdev);
169 struct net_device *ndev;
170
171 if (!dev)
172 return false;
173
174 ndev = to_net_dev(dev);
175
176 return ndev == net_dev;
177}
178
179static bool can_hw_control(struct led_netdev_data *trigger_data)
180{
181 unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);
182 unsigned int interval = atomic_read(v: &trigger_data->interval);
183 struct led_classdev *led_cdev = trigger_data->led_cdev;
184 int ret;
185
186 if (!supports_hw_control(led_cdev))
187 return false;
188
189 /*
190 * Interval must be set to the default
191 * value. Any different value is rejected if in hw
192 * control.
193 */
194 if (interval != default_interval)
195 return false;
196
197 /*
198 * net_dev must be set with hw control, otherwise no
199 * blinking can be happening and there is nothing to
200 * offloaded. Additionally, for hw control to be
201 * valid, the configured netdev must be the same as
202 * netdev associated to the LED.
203 */
204 if (!validate_net_dev(led_cdev, net_dev: trigger_data->net_dev))
205 return false;
206
207 /* Check if the requested mode is supported */
208 ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);
209 /* Fall back to software blinking if not supported */
210 if (ret == -EOPNOTSUPP)
211 return false;
212 if (ret) {
213 dev_warn(led_cdev->dev,
214 "Current mode check failed with error %d\n", ret);
215 return false;
216 }
217
218 return true;
219}
220
221static void get_device_state(struct led_netdev_data *trigger_data)
222{
223 struct ethtool_link_ksettings cmd;
224
225 trigger_data->carrier_link_up = netif_carrier_ok(dev: trigger_data->net_dev);
226
227 if (__ethtool_get_link_ksettings(dev: trigger_data->net_dev, link_ksettings: &cmd))
228 return;
229
230 if (trigger_data->carrier_link_up) {
231 trigger_data->link_speed = cmd.base.speed;
232 trigger_data->duplex = cmd.base.duplex;
233 }
234
235 /*
236 * Have a local copy of the link speed supported to avoid rtnl lock every time
237 * modes are refreshed on any change event
238 */
239 linkmode_copy(dst: trigger_data->supported_link_modes, src: cmd.link_modes.supported);
240}
241
242static ssize_t device_name_show(struct device *dev,
243 struct device_attribute *attr, char *buf)
244{
245 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
246 ssize_t len;
247
248 mutex_lock(&trigger_data->lock);
249 len = sprintf(buf, fmt: "%s\n", trigger_data->device_name);
250 mutex_unlock(lock: &trigger_data->lock);
251
252 return len;
253}
254
255static int set_device_name(struct led_netdev_data *trigger_data,
256 const char *name, size_t size)
257{
258 if (size >= IFNAMSIZ)
259 return -EINVAL;
260
261 cancel_delayed_work_sync(dwork: &trigger_data->work);
262
263 /*
264 * Take RTNL lock before trigger_data lock to prevent potential
265 * deadlock with netdev notifier registration.
266 */
267 rtnl_lock();
268 mutex_lock(&trigger_data->lock);
269
270 if (trigger_data->net_dev) {
271 dev_put(dev: trigger_data->net_dev);
272 trigger_data->net_dev = NULL;
273 }
274
275 memcpy(trigger_data->device_name, name, size);
276 trigger_data->device_name[size] = 0;
277 if (size > 0 && trigger_data->device_name[size - 1] == '\n')
278 trigger_data->device_name[size - 1] = 0;
279
280 if (trigger_data->device_name[0] != 0)
281 trigger_data->net_dev =
282 dev_get_by_name(net: &init_net, name: trigger_data->device_name);
283
284 trigger_data->carrier_link_up = false;
285 trigger_data->link_speed = SPEED_UNKNOWN;
286 trigger_data->duplex = DUPLEX_UNKNOWN;
287 if (trigger_data->net_dev)
288 get_device_state(trigger_data);
289
290 trigger_data->last_activity = 0;
291
292 /* Skip if we're called from netdev_trig_activate() and hw_control is true */
293 if (!trigger_data->hw_control || led_get_trigger_data(led_cdev: trigger_data->led_cdev))
294 set_baseline_state(trigger_data);
295
296 mutex_unlock(lock: &trigger_data->lock);
297 rtnl_unlock();
298
299 return 0;
300}
301
302static ssize_t device_name_store(struct device *dev,
303 struct device_attribute *attr, const char *buf,
304 size_t size)
305{
306 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
307 int ret;
308
309 ret = set_device_name(trigger_data, name: buf, size);
310
311 if (ret < 0)
312 return ret;
313
314 /* Refresh link_speed visibility */
315 sysfs_update_group(kobj: &dev->kobj, grp: &netdev_trig_link_speed_attrs_group);
316
317 return size;
318}
319
320static DEVICE_ATTR_RW(device_name);
321
322static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
323 enum led_trigger_netdev_modes attr)
324{
325 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
326 int bit;
327
328 switch (attr) {
329 case TRIGGER_NETDEV_LINK:
330 case TRIGGER_NETDEV_LINK_10:
331 case TRIGGER_NETDEV_LINK_100:
332 case TRIGGER_NETDEV_LINK_1000:
333 case TRIGGER_NETDEV_LINK_2500:
334 case TRIGGER_NETDEV_LINK_5000:
335 case TRIGGER_NETDEV_LINK_10000:
336 case TRIGGER_NETDEV_HALF_DUPLEX:
337 case TRIGGER_NETDEV_FULL_DUPLEX:
338 case TRIGGER_NETDEV_TX:
339 case TRIGGER_NETDEV_RX:
340 bit = attr;
341 break;
342 default:
343 return -EINVAL;
344 }
345
346 return sprintf(buf, fmt: "%u\n", test_bit(bit, &trigger_data->mode));
347}
348
349static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
350 size_t size, enum led_trigger_netdev_modes attr)
351{
352 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
353 struct led_classdev *led_cdev = trigger_data->led_cdev;
354 unsigned long state, mode = trigger_data->mode;
355 int ret;
356 int bit;
357
358 ret = kstrtoul(s: buf, base: 0, res: &state);
359 if (ret)
360 return ret;
361
362 switch (attr) {
363 case TRIGGER_NETDEV_LINK:
364 case TRIGGER_NETDEV_LINK_10:
365 case TRIGGER_NETDEV_LINK_100:
366 case TRIGGER_NETDEV_LINK_1000:
367 case TRIGGER_NETDEV_LINK_2500:
368 case TRIGGER_NETDEV_LINK_5000:
369 case TRIGGER_NETDEV_LINK_10000:
370 case TRIGGER_NETDEV_HALF_DUPLEX:
371 case TRIGGER_NETDEV_FULL_DUPLEX:
372 case TRIGGER_NETDEV_TX:
373 case TRIGGER_NETDEV_RX:
374 bit = attr;
375 break;
376 default:
377 return -EINVAL;
378 }
379
380 if (state)
381 set_bit(nr: bit, addr: &mode);
382 else
383 clear_bit(nr: bit, addr: &mode);
384
385 if (test_bit(TRIGGER_NETDEV_LINK, &mode) &&
386 (test_bit(TRIGGER_NETDEV_LINK_10, &mode) ||
387 test_bit(TRIGGER_NETDEV_LINK_100, &mode) ||
388 test_bit(TRIGGER_NETDEV_LINK_1000, &mode) ||
389 test_bit(TRIGGER_NETDEV_LINK_2500, &mode) ||
390 test_bit(TRIGGER_NETDEV_LINK_5000, &mode) ||
391 test_bit(TRIGGER_NETDEV_LINK_10000, &mode)))
392 return -EINVAL;
393
394 cancel_delayed_work_sync(dwork: &trigger_data->work);
395
396 trigger_data->mode = mode;
397 trigger_data->hw_control = can_hw_control(trigger_data);
398
399 if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking &&
400 !trigger_data->hw_control)
401 return -EOPNOTSUPP;
402
403 set_baseline_state(trigger_data);
404
405 return size;
406}
407
408#define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \
409 static ssize_t trigger_name##_show(struct device *dev, \
410 struct device_attribute *attr, char *buf) \
411 { \
412 return netdev_led_attr_show(dev, buf, trigger); \
413 } \
414 static ssize_t trigger_name##_store(struct device *dev, \
415 struct device_attribute *attr, const char *buf, size_t size) \
416 { \
417 return netdev_led_attr_store(dev, buf, size, trigger); \
418 } \
419 static DEVICE_ATTR_RW(trigger_name)
420
421DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);
422DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);
423DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);
424DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);
425DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500);
426DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000);
427DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000);
428DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);
429DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);
430DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);
431DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);
432
433static ssize_t interval_show(struct device *dev,
434 struct device_attribute *attr, char *buf)
435{
436 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
437
438 return sprintf(buf, fmt: "%u\n",
439 jiffies_to_msecs(j: atomic_read(v: &trigger_data->interval)));
440}
441
442static ssize_t interval_store(struct device *dev,
443 struct device_attribute *attr, const char *buf,
444 size_t size)
445{
446 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
447 unsigned long value;
448 int ret;
449
450 if (trigger_data->hw_control)
451 return -EINVAL;
452
453 ret = kstrtoul(s: buf, base: 0, res: &value);
454 if (ret)
455 return ret;
456
457 /* impose some basic bounds on the timer interval */
458 if (value >= 5 && value <= 10000) {
459 cancel_delayed_work_sync(dwork: &trigger_data->work);
460
461 atomic_set(v: &trigger_data->interval, i: msecs_to_jiffies(m: value));
462 set_baseline_state(trigger_data); /* resets timer */
463 }
464
465 return size;
466}
467
468static DEVICE_ATTR_RW(interval);
469
470static ssize_t offloaded_show(struct device *dev,
471 struct device_attribute *attr, char *buf)
472{
473 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
474
475 return sprintf(buf, fmt: "%d\n", trigger_data->hw_control);
476}
477
478static DEVICE_ATTR_RO(offloaded);
479
480#define CHECK_LINK_MODE_ATTR(link_speed) \
481 do { \
482 if (attr == &dev_attr_link_##link_speed.attr && \
483 link_ksettings.base.speed == SPEED_##link_speed) \
484 return attr->mode; \
485 } while (0)
486
487static umode_t netdev_trig_link_speed_visible(struct kobject *kobj,
488 struct attribute *attr, int n)
489{
490 struct device *dev = kobj_to_dev(kobj);
491 struct led_netdev_data *trigger_data;
492 unsigned long *supported_link_modes;
493 u32 mode;
494
495 trigger_data = led_trigger_get_drvdata(dev);
496 supported_link_modes = trigger_data->supported_link_modes;
497
498 /*
499 * Search in the supported link mode mask a matching supported mode.
500 * Stop at the first matching entry as we care only to check if a particular
501 * speed is supported and not the kind.
502 */
503 for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) {
504 struct ethtool_link_ksettings link_ksettings;
505
506 ethtool_params_from_link_mode(link_ksettings: &link_ksettings, link_mode: mode);
507
508 CHECK_LINK_MODE_ATTR(10);
509 CHECK_LINK_MODE_ATTR(100);
510 CHECK_LINK_MODE_ATTR(1000);
511 CHECK_LINK_MODE_ATTR(2500);
512 CHECK_LINK_MODE_ATTR(5000);
513 CHECK_LINK_MODE_ATTR(10000);
514 }
515
516 return 0;
517}
518
519static struct attribute *netdev_trig_link_speed_attrs[] = {
520 &dev_attr_link_10.attr,
521 &dev_attr_link_100.attr,
522 &dev_attr_link_1000.attr,
523 &dev_attr_link_2500.attr,
524 &dev_attr_link_5000.attr,
525 &dev_attr_link_10000.attr,
526 NULL
527};
528
529static const struct attribute_group netdev_trig_link_speed_attrs_group = {
530 .attrs = netdev_trig_link_speed_attrs,
531 .is_visible = netdev_trig_link_speed_visible,
532};
533
534static struct attribute *netdev_trig_attrs[] = {
535 &dev_attr_device_name.attr,
536 &dev_attr_link.attr,
537 &dev_attr_full_duplex.attr,
538 &dev_attr_half_duplex.attr,
539 &dev_attr_rx.attr,
540 &dev_attr_tx.attr,
541 &dev_attr_interval.attr,
542 &dev_attr_offloaded.attr,
543 NULL
544};
545
546static const struct attribute_group netdev_trig_attrs_group = {
547 .attrs = netdev_trig_attrs,
548};
549
550static const struct attribute_group *netdev_trig_groups[] = {
551 &netdev_trig_attrs_group,
552 &netdev_trig_link_speed_attrs_group,
553 NULL,
554};
555
556static int netdev_trig_notify(struct notifier_block *nb,
557 unsigned long evt, void *dv)
558{
559 struct net_device *dev =
560 netdev_notifier_info_to_dev(info: (struct netdev_notifier_info *)dv);
561 struct led_netdev_data *trigger_data =
562 container_of(nb, struct led_netdev_data, notifier);
563 struct led_classdev *led_cdev = trigger_data->led_cdev;
564
565 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
566 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
567 && evt != NETDEV_CHANGENAME)
568 return NOTIFY_DONE;
569
570 if (!(dev == trigger_data->net_dev ||
571 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
572 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
573 return NOTIFY_DONE;
574
575 cancel_delayed_work_sync(dwork: &trigger_data->work);
576
577 mutex_lock(&trigger_data->lock);
578
579 trigger_data->carrier_link_up = false;
580 trigger_data->link_speed = SPEED_UNKNOWN;
581 trigger_data->duplex = DUPLEX_UNKNOWN;
582 switch (evt) {
583 case NETDEV_CHANGENAME:
584 case NETDEV_REGISTER:
585 dev_put(dev: trigger_data->net_dev);
586 dev_hold(dev);
587 trigger_data->net_dev = dev;
588 if (evt == NETDEV_CHANGENAME)
589 get_device_state(trigger_data);
590 break;
591 case NETDEV_UNREGISTER:
592 dev_put(dev: trigger_data->net_dev);
593 trigger_data->net_dev = NULL;
594 break;
595 case NETDEV_UP:
596 case NETDEV_CHANGE:
597 get_device_state(trigger_data);
598 /* Refresh link_speed visibility */
599 if (evt == NETDEV_CHANGE)
600 sysfs_update_group(kobj: &led_cdev->dev->kobj,
601 grp: &netdev_trig_link_speed_attrs_group);
602 break;
603 }
604
605 set_baseline_state(trigger_data);
606
607 mutex_unlock(lock: &trigger_data->lock);
608
609 return NOTIFY_DONE;
610}
611
612/* here's the real work! */
613static void netdev_trig_work(struct work_struct *work)
614{
615 struct led_netdev_data *trigger_data =
616 container_of(work, struct led_netdev_data, work.work);
617 struct rtnl_link_stats64 *dev_stats;
618 unsigned int new_activity;
619 struct rtnl_link_stats64 temp;
620 unsigned long interval;
621 int invert;
622
623 /* If we dont have a device, insure we are off */
624 if (!trigger_data->net_dev) {
625 led_set_brightness(led_cdev: trigger_data->led_cdev, brightness: LED_OFF);
626 return;
627 }
628
629 /* If we are not looking for RX/TX then return */
630 if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) &&
631 !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode))
632 return;
633
634 dev_stats = dev_get_stats(dev: trigger_data->net_dev, storage: &temp);
635 new_activity =
636 (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ?
637 dev_stats->tx_packets : 0) +
638 (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ?
639 dev_stats->rx_packets : 0);
640
641 if (trigger_data->last_activity != new_activity) {
642 led_stop_software_blink(led_cdev: trigger_data->led_cdev);
643
644 invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) ||
645 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) ||
646 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) ||
647 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) ||
648 test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) ||
649 test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) ||
650 test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) ||
651 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) ||
652 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode);
653 interval = jiffies_to_msecs(
654 j: atomic_read(v: &trigger_data->interval));
655 /* base state is ON (link present) */
656 led_blink_set_oneshot(led_cdev: trigger_data->led_cdev,
657 delay_on: &interval,
658 delay_off: &interval,
659 invert);
660 trigger_data->last_activity = new_activity;
661 }
662
663 schedule_delayed_work(dwork: &trigger_data->work,
664 delay: (atomic_read(v: &trigger_data->interval)*2));
665}
666
667static int netdev_trig_activate(struct led_classdev *led_cdev)
668{
669 struct led_netdev_data *trigger_data;
670 unsigned long mode = 0;
671 struct device *dev;
672 int rc;
673
674 trigger_data = kzalloc(size: sizeof(struct led_netdev_data), GFP_KERNEL);
675 if (!trigger_data)
676 return -ENOMEM;
677
678 mutex_init(&trigger_data->lock);
679
680 trigger_data->notifier.notifier_call = netdev_trig_notify;
681 trigger_data->notifier.priority = 10;
682
683 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
684
685 trigger_data->led_cdev = led_cdev;
686 trigger_data->net_dev = NULL;
687 trigger_data->device_name[0] = 0;
688
689 trigger_data->mode = 0;
690 atomic_set(v: &trigger_data->interval, i: msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
691 trigger_data->last_activity = 0;
692
693 /* Check if hw control is active by default on the LED.
694 * Init already enabled mode in hw control.
695 */
696 if (supports_hw_control(led_cdev)) {
697 dev = led_cdev->hw_control_get_device(led_cdev);
698 if (dev) {
699 const char *name = dev_name(dev);
700
701 trigger_data->hw_control = true;
702 set_device_name(trigger_data, name, strlen(name));
703
704 rc = led_cdev->hw_control_get(led_cdev, &mode);
705 if (!rc)
706 trigger_data->mode = mode;
707 }
708 }
709
710 led_set_trigger_data(led_cdev, trigger_data);
711
712 rc = register_netdevice_notifier(nb: &trigger_data->notifier);
713 if (rc)
714 kfree(objp: trigger_data);
715
716 return rc;
717}
718
719static void netdev_trig_deactivate(struct led_classdev *led_cdev)
720{
721 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
722
723 unregister_netdevice_notifier(nb: &trigger_data->notifier);
724
725 cancel_delayed_work_sync(dwork: &trigger_data->work);
726
727 led_set_brightness(led_cdev, brightness: LED_OFF);
728
729 dev_put(dev: trigger_data->net_dev);
730
731 kfree(objp: trigger_data);
732}
733
734static struct led_trigger netdev_led_trigger = {
735 .name = "netdev",
736 .activate = netdev_trig_activate,
737 .deactivate = netdev_trig_deactivate,
738 .groups = netdev_trig_groups,
739};
740
741module_led_trigger(netdev_led_trigger);
742
743MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
744MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
745MODULE_DESCRIPTION("Netdev LED trigger");
746MODULE_LICENSE("GPL v2");
747MODULE_ALIAS("ledtrig:netdev");
748

source code of linux/drivers/leds/trigger/ledtrig-netdev.c