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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 * tx_err - LED blinks on transmit error
43 * rx_err - LED blinks on receive error
44 *
45 * Note: If the user selects a mode that is not supported by hw, default
46 * behavior is to fall back to software control of the LED. However not every
47 * hw supports software control. LED callbacks brightness_set() and
48 * 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 selected
50 * mode isn't supported by hw. This could be switching off the LED or any
51 * hw blink mode. If software control fallback isn't possible, we return
52 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed
53 * in case an intermediate unsupported mode is necessary to switch from one
54 * 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 else
143 led_set_brightness(led_cdev, LED_OFF);
144
145 /* If we are looking for RX/TX start periodically
146 * checking stats
147 */
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 with
167 * 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 default
195 * value. Any different value is rejected if in hw
196 * control.
197 */
198 if (interval != default_interval)
199 return false;
200
201 /*
202 * net_dev must be set with hw control, otherwise no
203 * blinking can be happening and there is nothing to
204 * offloaded. Additionally, for hw control to be
205 * valid, the configured netdev must be the same as
206 * 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 time
241 * modes are refreshed on any change event
242 */
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 potential
269 * 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 else
391 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 particular
511 * 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 NULL
537};
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 NULL
556};
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_CHANGE
578 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
579 && 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");
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/list.h>
22#include <linux/module.h>
23#include <linux/netdevice.h>
24#include <linux/mutex.h>
25#include <linux/rtnetlink.h>
26#include <linux/timer.h>
27#include "../leds.h"
28
29#define NETDEV_LED_DEFAULT_INTERVAL 50
30
31/*
32 * Configurable sysfs attributes:
33 *
34 * device_name - network device name to monitor
35 * interval - duration of LED blink, in milliseconds
36 * link - LED's normal state reflects whether the link is up
37 * (has carrier) or not
38 * tx - LED blinks on transmitted data
39 * rx - LED blinks on receive data
40 *
41 * Note: If the user selects a mode that is not supported by hw, default
42 * behavior is to fall back to software control of the LED. However not every
43 * hw supports software control. LED callbacks brightness_set() and
44 * brightness_set_blocking() are NULL in this case. hw_control_is_supported()
45 * should use available means supported by hw to inform the user that selected
46 * mode isn't supported by hw. This could be switching off the LED or any
47 * hw blink mode. If software control fallback isn't possible, we return
48 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed
49 * in case an intermediate unsupported mode is necessary to switch from one
50 * supported mode to another.
51 */
52
53struct led_netdev_data {
54 struct mutex lock;
55
56 struct delayed_work work;
57 struct notifier_block notifier;
58
59 struct led_classdev *led_cdev;
60 struct net_device *net_dev;
61
62 char device_name[IFNAMSIZ];
63 atomic_t interval;
64 unsigned int last_activity;
65
66 unsigned long mode;
67 int link_speed;
68 u8 duplex;
69
70 bool carrier_link_up;
71 bool hw_control;
72};
73
74static void set_baseline_state(struct led_netdev_data *trigger_data)
75{
76 int current_brightness;
77 struct led_classdev *led_cdev = trigger_data->led_cdev;
78
79 /* Already validated, hw control is possible with the requested mode */
80 if (trigger_data->hw_control) {
81 led_cdev->hw_control_set(led_cdev, trigger_data->mode);
82
83 return;
84 }
85
86 current_brightness = led_cdev->brightness;
87 if (current_brightness)
88 led_cdev->blink_brightness = current_brightness;
89 if (!led_cdev->blink_brightness)
90 led_cdev->blink_brightness = led_cdev->max_brightness;
91
92 if (!trigger_data->carrier_link_up) {
93 led_set_brightness(led_cdev, LED_OFF);
94 } else {
95 bool blink_on = false;
96
97 if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode))
98 blink_on = true;
99
100 if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) &&
101 trigger_data->link_speed == SPEED_10)
102 blink_on = true;
103
104 if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) &&
105 trigger_data->link_speed == SPEED_100)
106 blink_on = true;
107
108 if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) &&
109 trigger_data->link_speed == SPEED_1000)
110 blink_on = true;
111
112 if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) &&
113 trigger_data->link_speed == SPEED_2500)
114 blink_on = true;
115
116 if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) &&
117 trigger_data->link_speed == SPEED_5000)
118 blink_on = true;
119
120 if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) &&
121 trigger_data->link_speed == SPEED_10000)
122 blink_on = true;
123
124 if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) &&
125 trigger_data->duplex == DUPLEX_HALF)
126 blink_on = true;
127
128 if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) &&
129 trigger_data->duplex == DUPLEX_FULL)
130 blink_on = true;
131
132 if (blink_on)
133 led_set_brightness(led_cdev,
134 led_cdev->blink_brightness);
135 else
136 led_set_brightness(led_cdev, LED_OFF);
137
138 /* If we are looking for RX/TX start periodically
139 * checking stats
140 */
141 if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ||
142 test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode))
143 schedule_delayed_work(&trigger_data->work, 0);
144 }
145}
146
147static bool supports_hw_control(struct led_classdev *led_cdev)
148{
149 if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
150 !led_cdev->hw_control_is_supported)
151 return false;
152
153 return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
154}
155
156/*
157 * Validate the configured netdev is the same as the one associated with
158 * the LED driver in hw control.
159 */
160static bool validate_net_dev(struct led_classdev *led_cdev,
161 struct net_device *net_dev)
162{
163 struct device *dev = led_cdev->hw_control_get_device(led_cdev);
164 struct net_device *ndev;
165
166 if (!dev)
167 return false;
168
169 ndev = to_net_dev(dev);
170
171 return ndev == net_dev;
172}
173
174static bool can_hw_control(struct led_netdev_data *trigger_data)
175{
176 unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);
177 unsigned int interval = atomic_read(&trigger_data->interval);
178 struct led_classdev *led_cdev = trigger_data->led_cdev;
179 int ret;
180
181 if (!supports_hw_control(led_cdev))
182 return false;
183
184 /*
185 * Interval must be set to the default
186 * value. Any different value is rejected if in hw
187 * control.
188 */
189 if (interval != default_interval)
190 return false;
191
192 /*
193 * net_dev must be set with hw control, otherwise no
194 * blinking can be happening and there is nothing to
195 * offloaded. Additionally, for hw control to be
196 * valid, the configured netdev must be the same as
197 * netdev associated to the LED.
198 */
199 if (!validate_net_dev(led_cdev, trigger_data->net_dev))
200 return false;
201
202 /* Check if the requested mode is supported */
203 ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);
204 /* Fall back to software blinking if not supported */
205 if (ret == -EOPNOTSUPP)
206 return false;
207 if (ret) {
208 dev_warn(led_cdev->dev,
209 "Current mode check failed with error %d\n", ret);
210 return false;
211 }
212
213 return true;
214}
215
216static void get_device_state(struct led_netdev_data *trigger_data)
217{
218 struct ethtool_link_ksettings cmd;
219
220 trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
221 if (!trigger_data->carrier_link_up)
222 return;
223
224 if (!__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd)) {
225 trigger_data->link_speed = cmd.base.speed;
226 trigger_data->duplex = cmd.base.duplex;
227 }
228}
229
230static ssize_t device_name_show(struct device *dev,
231 struct device_attribute *attr, char *buf)
232{
233 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
234 ssize_t len;
235
236 mutex_lock(&trigger_data->lock);
237 len = sprintf(buf, "%s\n", trigger_data->device_name);
238 mutex_unlock(&trigger_data->lock);
239
240 return len;
241}
242
243static int set_device_name(struct led_netdev_data *trigger_data,
244 const char *name, size_t size)
245{
246 if (size >= IFNAMSIZ)
247 return -EINVAL;
248
249 cancel_delayed_work_sync(&trigger_data->work);
250
251 /*
252 * Take RTNL lock before trigger_data lock to prevent potential
253 * deadlock with netdev notifier registration.
254 */
255 rtnl_lock();
256 mutex_lock(&trigger_data->lock);
257
258 if (trigger_data->net_dev) {
259 dev_put(trigger_data->net_dev);
260 trigger_data->net_dev = NULL;
261 }
262
263 memcpy(trigger_data->device_name, name, size);
264 trigger_data->device_name[size] = 0;
265 if (size > 0 && trigger_data->device_name[size - 1] == '\n')
266 trigger_data->device_name[size - 1] = 0;
267
268 if (trigger_data->device_name[0] != 0)
269 trigger_data->net_dev =
270 dev_get_by_name(&init_net, trigger_data->device_name);
271
272 trigger_data->carrier_link_up = false;
273 trigger_data->link_speed = SPEED_UNKNOWN;
274 trigger_data->duplex = DUPLEX_UNKNOWN;
275 if (trigger_data->net_dev)
276 get_device_state(trigger_data);
277
278 trigger_data->last_activity = 0;
279
280 set_baseline_state(trigger_data);
281 mutex_unlock(&trigger_data->lock);
282 rtnl_unlock();
283
284 return 0;
285}
286
287static ssize_t device_name_store(struct device *dev,
288 struct device_attribute *attr, const char *buf,
289 size_t size)
290{
291 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
292 int ret;
293
294 ret = set_device_name(trigger_data, buf, size);
295
296 if (ret < 0)
297 return ret;
298 return size;
299}
300
301static DEVICE_ATTR_RW(device_name);
302
303static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
304 enum led_trigger_netdev_modes attr)
305{
306 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
307 int bit;
308
309 switch (attr) {
310 case TRIGGER_NETDEV_LINK:
311 case TRIGGER_NETDEV_LINK_10:
312 case TRIGGER_NETDEV_LINK_100:
313 case TRIGGER_NETDEV_LINK_1000:
314 case TRIGGER_NETDEV_LINK_2500:
315 case TRIGGER_NETDEV_LINK_5000:
316 case TRIGGER_NETDEV_LINK_10000:
317 case TRIGGER_NETDEV_HALF_DUPLEX:
318 case TRIGGER_NETDEV_FULL_DUPLEX:
319 case TRIGGER_NETDEV_TX:
320 case TRIGGER_NETDEV_RX:
321 bit = attr;
322 break;
323 default:
324 return -EINVAL;
325 }
326
327 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
328}
329
330static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
331 size_t size, enum led_trigger_netdev_modes attr)
332{
333 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
334 struct led_classdev *led_cdev = trigger_data->led_cdev;
335 unsigned long state, mode = trigger_data->mode;
336 int ret;
337 int bit;
338
339 ret = kstrtoul(buf, 0, &state);
340 if (ret)
341 return ret;
342
343 switch (attr) {
344 case TRIGGER_NETDEV_LINK:
345 case TRIGGER_NETDEV_LINK_10:
346 case TRIGGER_NETDEV_LINK_100:
347 case TRIGGER_NETDEV_LINK_1000:
348 case TRIGGER_NETDEV_LINK_2500:
349 case TRIGGER_NETDEV_LINK_5000:
350 case TRIGGER_NETDEV_LINK_10000:
351 case TRIGGER_NETDEV_HALF_DUPLEX:
352 case TRIGGER_NETDEV_FULL_DUPLEX:
353 case TRIGGER_NETDEV_TX:
354 case TRIGGER_NETDEV_RX:
355 bit = attr;
356 break;
357 default:
358 return -EINVAL;
359 }
360
361 if (state)
362 set_bit(bit, &mode);
363 else
364 clear_bit(bit, &mode);
365
366 if (test_bit(TRIGGER_NETDEV_LINK, &mode) &&
367 (test_bit(TRIGGER_NETDEV_LINK_10, &mode) ||
368 test_bit(TRIGGER_NETDEV_LINK_100, &mode) ||
369 test_bit(TRIGGER_NETDEV_LINK_1000, &mode) ||
370 test_bit(TRIGGER_NETDEV_LINK_2500, &mode) ||
371 test_bit(TRIGGER_NETDEV_LINK_5000, &mode) ||
372 test_bit(TRIGGER_NETDEV_LINK_10000, &mode)))
373 return -EINVAL;
374
375 cancel_delayed_work_sync(&trigger_data->work);
376
377 trigger_data->mode = mode;
378 trigger_data->hw_control = can_hw_control(trigger_data);
379
380 if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking &&
381 !trigger_data->hw_control)
382 return -EOPNOTSUPP;
383
384 set_baseline_state(trigger_data);
385
386 return size;
387}
388
389#define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \
390 static ssize_t trigger_name##_show(struct device *dev, \
391 struct device_attribute *attr, char *buf) \
392 { \
393 return netdev_led_attr_show(dev, buf, trigger); \
394 } \
395 static ssize_t trigger_name##_store(struct device *dev, \
396 struct device_attribute *attr, const char *buf, size_t size) \
397 { \
398 return netdev_led_attr_store(dev, buf, size, trigger); \
399 } \
400 static DEVICE_ATTR_RW(trigger_name)
401
402DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);
403DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);
404DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);
405DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);
406DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500);
407DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000);
408DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000);
409DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);
410DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);
411DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);
412DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);
413
414static ssize_t interval_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
416{
417 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
418
419 return sprintf(buf, "%u\n",
420 jiffies_to_msecs(atomic_read(&trigger_data->interval)));
421}
422
423static ssize_t interval_store(struct device *dev,
424 struct device_attribute *attr, const char *buf,
425 size_t size)
426{
427 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
428 unsigned long value;
429 int ret;
430
431 if (trigger_data->hw_control)
432 return -EINVAL;
433
434 ret = kstrtoul(buf, 0, &value);
435 if (ret)
436 return ret;
437
438 /* impose some basic bounds on the timer interval */
439 if (value >= 5 && value <= 10000) {
440 cancel_delayed_work_sync(&trigger_data->work);
441
442 atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
443 set_baseline_state(trigger_data); /* resets timer */
444 }
445
446 return size;
447}
448
449static DEVICE_ATTR_RW(interval);
450
451static ssize_t offloaded_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
453{
454 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
455
456 return sprintf(buf, "%d\n", trigger_data->hw_control);
457}
458
459static DEVICE_ATTR_RO(offloaded);
460
461static struct attribute *netdev_trig_attrs[] = {
462 &dev_attr_device_name.attr,
463 &dev_attr_link.attr,
464 &dev_attr_link_10.attr,
465 &dev_attr_link_100.attr,
466 &dev_attr_link_1000.attr,
467 &dev_attr_link_2500.attr,
468 &dev_attr_link_5000.attr,
469 &dev_attr_link_10000.attr,
470 &dev_attr_full_duplex.attr,
471 &dev_attr_half_duplex.attr,
472 &dev_attr_rx.attr,
473 &dev_attr_tx.attr,
474 &dev_attr_interval.attr,
475 &dev_attr_offloaded.attr,
476 NULL
477};
478ATTRIBUTE_GROUPS(netdev_trig);
479
480static int netdev_trig_notify(struct notifier_block *nb,
481 unsigned long evt, void *dv)
482{
483 struct net_device *dev =
484 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
485 struct led_netdev_data *trigger_data =
486 container_of(nb, struct led_netdev_data, notifier);
487
488 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
489 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
490 && evt != NETDEV_CHANGENAME)
491 return NOTIFY_DONE;
492
493 if (!(dev == trigger_data->net_dev ||
494 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
495 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
496 return NOTIFY_DONE;
497
498 cancel_delayed_work_sync(&trigger_data->work);
499
500 mutex_lock(&trigger_data->lock);
501
502 trigger_data->carrier_link_up = false;
503 trigger_data->link_speed = SPEED_UNKNOWN;
504 trigger_data->duplex = DUPLEX_UNKNOWN;
505 switch (evt) {
506 case NETDEV_CHANGENAME:
507 get_device_state(trigger_data);
508 fallthrough;
509 case NETDEV_REGISTER:
510 dev_put(trigger_data->net_dev);
511 dev_hold(dev);
512 trigger_data->net_dev = dev;
513 break;
514 case NETDEV_UNREGISTER:
515 dev_put(trigger_data->net_dev);
516 trigger_data->net_dev = NULL;
517 break;
518 case NETDEV_UP:
519 case NETDEV_CHANGE:
520 get_device_state(trigger_data);
521 break;
522 }
523
524 set_baseline_state(trigger_data);
525
526 mutex_unlock(&trigger_data->lock);
527
528 return NOTIFY_DONE;
529}
530
531/* here's the real work! */
532static void netdev_trig_work(struct work_struct *work)
533{
534 struct led_netdev_data *trigger_data =
535 container_of(work, struct led_netdev_data, work.work);
536 struct rtnl_link_stats64 *dev_stats;
537 unsigned int new_activity;
538 struct rtnl_link_stats64 temp;
539 unsigned long interval;
540 int invert;
541
542 /* If we dont have a device, insure we are off */
543 if (!trigger_data->net_dev) {
544 led_set_brightness(trigger_data->led_cdev, LED_OFF);
545 return;
546 }
547
548 /* If we are not looking for RX/TX then return */
549 if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) &&
550 !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode))
551 return;
552
553 dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
554 new_activity =
555 (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ?
556 dev_stats->tx_packets : 0) +
557 (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ?
558 dev_stats->rx_packets : 0);
559
560 if (trigger_data->last_activity != new_activity) {
561 led_stop_software_blink(trigger_data->led_cdev);
562
563 invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) ||
564 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) ||
565 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) ||
566 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) ||
567 test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) ||
568 test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) ||
569 test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) ||
570 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) ||
571 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode);
572 interval = jiffies_to_msecs(
573 atomic_read(&trigger_data->interval));
574 /* base state is ON (link present) */
575 led_blink_set_oneshot(trigger_data->led_cdev,
576 &interval,
577 &interval,
578 invert);
579 trigger_data->last_activity = new_activity;
580 }
581
582 schedule_delayed_work(&trigger_data->work,
583 (atomic_read(&trigger_data->interval)*2));
584}
585
586static int netdev_trig_activate(struct led_classdev *led_cdev)
587{
588 struct led_netdev_data *trigger_data;
589 unsigned long mode = 0;
590 struct device *dev;
591 int rc;
592
593 trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
594 if (!trigger_data)
595 return -ENOMEM;
596
597 mutex_init(&trigger_data->lock);
598
599 trigger_data->notifier.notifier_call = netdev_trig_notify;
600 trigger_data->notifier.priority = 10;
601
602 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
603
604 trigger_data->led_cdev = led_cdev;
605 trigger_data->net_dev = NULL;
606 trigger_data->device_name[0] = 0;
607
608 trigger_data->mode = 0;
609 atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
610 trigger_data->last_activity = 0;
611
612 /* Check if hw control is active by default on the LED.
613 * Init already enabled mode in hw control.
614 */
615 if (supports_hw_control(led_cdev)) {
616 dev = led_cdev->hw_control_get_device(led_cdev);
617 if (dev) {
618 const char *name = dev_name(dev);
619
620 set_device_name(trigger_data, name, strlen(name));
621 trigger_data->hw_control = true;
622
623 rc = led_cdev->hw_control_get(led_cdev, &mode);
624 if (!rc)
625 trigger_data->mode = mode;
626 }
627 }
628
629 led_set_trigger_data(led_cdev, trigger_data);
630
631 rc = register_netdevice_notifier(&trigger_data->notifier);
632 if (rc)
633 kfree(trigger_data);
634
635 return rc;
636}
637
638static void netdev_trig_deactivate(struct led_classdev *led_cdev)
639{
640 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
641
642 unregister_netdevice_notifier(&trigger_data->notifier);
643
644 cancel_delayed_work_sync(&trigger_data->work);
645
646 led_set_brightness(led_cdev, LED_OFF);
647
648 dev_put(trigger_data->net_dev);
649
650 kfree(trigger_data);
651}
652
653static struct led_trigger netdev_led_trigger = {
654 .name = "netdev",
655 .activate = netdev_trig_activate,
656 .deactivate = netdev_trig_deactivate,
657 .groups = netdev_trig_groups,
658};
659
660module_led_trigger(netdev_led_trigger);
661
662MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
663MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
664MODULE_DESCRIPTION("Netdev LED trigger");
665MODULE_LICENSE("GPL v2");