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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/init.h>
17#include <linux/jiffies.h>
18#include <linux/kernel.h>
19#include <linux/leds.h>
20#include <linux/list.h>
21#include <linux/module.h>
22#include <linux/netdevice.h>
23#include <linux/spinlock.h>
24#include <linux/timer.h>
25#include "../leds.h"
26
27/*
28 * Configurable sysfs attributes:
29 *
30 * device_name - network device name to monitor
31 * interval - duration of LED blink, in milliseconds
32 * link - LED's normal state reflects whether the link is up
33 * (has carrier) or not
34 * tx - LED blinks on transmitted data
35 * rx - LED blinks on receive data
36 *
37 */
38
39struct led_netdev_data {
40 spinlock_t lock;
41
42 struct delayed_work work;
43 struct notifier_block notifier;
44
45 struct led_classdev *led_cdev;
46 struct net_device *net_dev;
47
48 char device_name[IFNAMSIZ];
49 atomic_t interval;
50 unsigned int last_activity;
51
52 unsigned long mode;
53#define NETDEV_LED_LINK 0
54#define NETDEV_LED_TX 1
55#define NETDEV_LED_RX 2
56#define NETDEV_LED_MODE_LINKUP 3
57};
58
59enum netdev_led_attr {
60 NETDEV_ATTR_LINK,
61 NETDEV_ATTR_TX,
62 NETDEV_ATTR_RX
63};
64
65static void set_baseline_state(struct led_netdev_data *trigger_data)
66{
67 int current_brightness;
68 struct led_classdev *led_cdev = trigger_data->led_cdev;
69
70 current_brightness = led_cdev->brightness;
71 if (current_brightness)
72 led_cdev->blink_brightness = current_brightness;
73 if (!led_cdev->blink_brightness)
74 led_cdev->blink_brightness = led_cdev->max_brightness;
75
76 if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
77 led_set_brightness(led_cdev, LED_OFF);
78 else {
79 if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
80 led_set_brightness(led_cdev,
81 led_cdev->blink_brightness);
82 else
83 led_set_brightness(led_cdev, LED_OFF);
84
85 /* If we are looking for RX/TX start periodically
86 * checking stats
87 */
88 if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
89 test_bit(NETDEV_LED_RX, &trigger_data->mode))
90 schedule_delayed_work(&trigger_data->work, 0);
91 }
92}
93
94static ssize_t device_name_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
96{
97 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
98 ssize_t len;
99
100 spin_lock_bh(&trigger_data->lock);
101 len = sprintf(buf, "%s\n", trigger_data->device_name);
102 spin_unlock_bh(&trigger_data->lock);
103
104 return len;
105}
106
107static ssize_t device_name_store(struct device *dev,
108 struct device_attribute *attr, const char *buf,
109 size_t size)
110{
111 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
112
113 if (size >= IFNAMSIZ)
114 return -EINVAL;
115
116 cancel_delayed_work_sync(&trigger_data->work);
117
118 spin_lock_bh(&trigger_data->lock);
119
120 if (trigger_data->net_dev) {
121 dev_put(trigger_data->net_dev);
122 trigger_data->net_dev = NULL;
123 }
124
125 memcpy(trigger_data->device_name, buf, size);
126 trigger_data->device_name[size] = 0;
127 if (size > 0 && trigger_data->device_name[size - 1] == '\n')
128 trigger_data->device_name[size - 1] = 0;
129
130 if (trigger_data->device_name[0] != 0)
131 trigger_data->net_dev =
132 dev_get_by_name(&init_net, trigger_data->device_name);
133
134 clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
135 if (trigger_data->net_dev != NULL)
136 if (netif_carrier_ok(trigger_data->net_dev))
137 set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
138
139 trigger_data->last_activity = 0;
140
141 set_baseline_state(trigger_data);
142 spin_unlock_bh(&trigger_data->lock);
143
144 return size;
145}
146
147static DEVICE_ATTR_RW(device_name);
148
149static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
150 enum netdev_led_attr attr)
151{
152 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
153 int bit;
154
155 switch (attr) {
156 case NETDEV_ATTR_LINK:
157 bit = NETDEV_LED_LINK;
158 break;
159 case NETDEV_ATTR_TX:
160 bit = NETDEV_LED_TX;
161 break;
162 case NETDEV_ATTR_RX:
163 bit = NETDEV_LED_RX;
164 break;
165 default:
166 return -EINVAL;
167 }
168
169 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
170}
171
172static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
173 size_t size, enum netdev_led_attr attr)
174{
175 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
176 unsigned long state;
177 int ret;
178 int bit;
179
180 ret = kstrtoul(buf, 0, &state);
181 if (ret)
182 return ret;
183
184 switch (attr) {
185 case NETDEV_ATTR_LINK:
186 bit = NETDEV_LED_LINK;
187 break;
188 case NETDEV_ATTR_TX:
189 bit = NETDEV_LED_TX;
190 break;
191 case NETDEV_ATTR_RX:
192 bit = NETDEV_LED_RX;
193 break;
194 default:
195 return -EINVAL;
196 }
197
198 cancel_delayed_work_sync(&trigger_data->work);
199
200 if (state)
201 set_bit(bit, &trigger_data->mode);
202 else
203 clear_bit(bit, &trigger_data->mode);
204
205 set_baseline_state(trigger_data);
206
207 return size;
208}
209
210static ssize_t link_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
212{
213 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
214}
215
216static ssize_t link_store(struct device *dev,
217 struct device_attribute *attr, const char *buf, size_t size)
218{
219 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
220}
221
222static DEVICE_ATTR_RW(link);
223
224static ssize_t tx_show(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
228}
229
230static ssize_t tx_store(struct device *dev,
231 struct device_attribute *attr, const char *buf, size_t size)
232{
233 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
234}
235
236static DEVICE_ATTR_RW(tx);
237
238static ssize_t rx_show(struct device *dev,
239 struct device_attribute *attr, char *buf)
240{
241 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
242}
243
244static ssize_t rx_store(struct device *dev,
245 struct device_attribute *attr, const char *buf, size_t size)
246{
247 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
248}
249
250static DEVICE_ATTR_RW(rx);
251
252static ssize_t interval_show(struct device *dev,
253 struct device_attribute *attr, char *buf)
254{
255 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
256
257 return sprintf(buf, "%u\n",
258 jiffies_to_msecs(atomic_read(&trigger_data->interval)));
259}
260
261static ssize_t interval_store(struct device *dev,
262 struct device_attribute *attr, const char *buf,
263 size_t size)
264{
265 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
266 unsigned long value;
267 int ret;
268
269 ret = kstrtoul(buf, 0, &value);
270 if (ret)
271 return ret;
272
273 /* impose some basic bounds on the timer interval */
274 if (value >= 5 && value <= 10000) {
275 cancel_delayed_work_sync(&trigger_data->work);
276
277 atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
278 set_baseline_state(trigger_data); /* resets timer */
279 }
280
281 return size;
282}
283
284static DEVICE_ATTR_RW(interval);
285
286static struct attribute *netdev_trig_attrs[] = {
287 &dev_attr_device_name.attr,
288 &dev_attr_link.attr,
289 &dev_attr_rx.attr,
290 &dev_attr_tx.attr,
291 &dev_attr_interval.attr,
292 NULL
293};
294ATTRIBUTE_GROUPS(netdev_trig);
295
296static int netdev_trig_notify(struct notifier_block *nb,
297 unsigned long evt, void *dv)
298{
299 struct net_device *dev =
300 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
301 struct led_netdev_data *trigger_data =
302 container_of(nb, struct led_netdev_data, notifier);
303
304 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
305 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
306 && evt != NETDEV_CHANGENAME)
307 return NOTIFY_DONE;
308
309 if (!(dev == trigger_data->net_dev ||
310 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
311 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
312 return NOTIFY_DONE;
313
314 cancel_delayed_work_sync(&trigger_data->work);
315
316 spin_lock_bh(&trigger_data->lock);
317
318 clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
319 switch (evt) {
320 case NETDEV_CHANGENAME:
321 case NETDEV_REGISTER:
322 if (trigger_data->net_dev)
323 dev_put(trigger_data->net_dev);
324 dev_hold(dev);
325 trigger_data->net_dev = dev;
326 break;
327 case NETDEV_UNREGISTER:
328 dev_put(trigger_data->net_dev);
329 trigger_data->net_dev = NULL;
330 break;
331 case NETDEV_UP:
332 case NETDEV_CHANGE:
333 if (netif_carrier_ok(dev))
334 set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
335 break;
336 }
337
338 set_baseline_state(trigger_data);
339
340 spin_unlock_bh(&trigger_data->lock);
341
342 return NOTIFY_DONE;
343}
344
345/* here's the real work! */
346static void netdev_trig_work(struct work_struct *work)
347{
348 struct led_netdev_data *trigger_data =
349 container_of(work, struct led_netdev_data, work.work);
350 struct rtnl_link_stats64 *dev_stats;
351 unsigned int new_activity;
352 struct rtnl_link_stats64 temp;
353 unsigned long interval;
354 int invert;
355
356 /* If we dont have a device, insure we are off */
357 if (!trigger_data->net_dev) {
358 led_set_brightness(trigger_data->led_cdev, LED_OFF);
359 return;
360 }
361
362 /* If we are not looking for RX/TX then return */
363 if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
364 !test_bit(NETDEV_LED_RX, &trigger_data->mode))
365 return;
366
367 dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
368 new_activity =
369 (test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
370 dev_stats->tx_packets : 0) +
371 (test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
372 dev_stats->rx_packets : 0);
373
374 if (trigger_data->last_activity != new_activity) {
375 led_stop_software_blink(trigger_data->led_cdev);
376
377 invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
378 interval = jiffies_to_msecs(
379 atomic_read(&trigger_data->interval));
380 /* base state is ON (link present) */
381 led_blink_set_oneshot(trigger_data->led_cdev,
382 &interval,
383 &interval,
384 invert);
385 trigger_data->last_activity = new_activity;
386 }
387
388 schedule_delayed_work(&trigger_data->work,
389 (atomic_read(&trigger_data->interval)*2));
390}
391
392static int netdev_trig_activate(struct led_classdev *led_cdev)
393{
394 struct led_netdev_data *trigger_data;
395 int rc;
396
397 trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
398 if (!trigger_data)
399 return -ENOMEM;
400
401 spin_lock_init(&trigger_data->lock);
402
403 trigger_data->notifier.notifier_call = netdev_trig_notify;
404 trigger_data->notifier.priority = 10;
405
406 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
407
408 trigger_data->led_cdev = led_cdev;
409 trigger_data->net_dev = NULL;
410 trigger_data->device_name[0] = 0;
411
412 trigger_data->mode = 0;
413 atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
414 trigger_data->last_activity = 0;
415
416 led_set_trigger_data(led_cdev, trigger_data);
417
418 rc = register_netdevice_notifier(&trigger_data->notifier);
419 if (rc)
420 kfree(trigger_data);
421
422 return rc;
423}
424
425static void netdev_trig_deactivate(struct led_classdev *led_cdev)
426{
427 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
428
429 unregister_netdevice_notifier(&trigger_data->notifier);
430
431 cancel_delayed_work_sync(&trigger_data->work);
432
433 if (trigger_data->net_dev)
434 dev_put(trigger_data->net_dev);
435
436 kfree(trigger_data);
437}
438
439static struct led_trigger netdev_led_trigger = {
440 .name = "netdev",
441 .activate = netdev_trig_activate,
442 .deactivate = netdev_trig_deactivate,
443 .groups = netdev_trig_groups,
444};
445
446static int __init netdev_trig_init(void)
447{
448 return led_trigger_register(&netdev_led_trigger);
449}
450
451static void __exit netdev_trig_exit(void)
452{
453 led_trigger_unregister(&netdev_led_trigger);
454}
455
456module_init(netdev_trig_init);
457module_exit(netdev_trig_exit);
458
459MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
460MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
461MODULE_DESCRIPTION("Netdev LED trigger");
462MODULE_LICENSE("GPL v2");
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/init.h>
17#include <linux/jiffies.h>
18#include <linux/kernel.h>
19#include <linux/leds.h>
20#include <linux/list.h>
21#include <linux/module.h>
22#include <linux/netdevice.h>
23#include <linux/spinlock.h>
24#include <linux/timer.h>
25#include "../leds.h"
26
27/*
28 * Configurable sysfs attributes:
29 *
30 * device_name - network device name to monitor
31 * interval - duration of LED blink, in milliseconds
32 * link - LED's normal state reflects whether the link is up
33 * (has carrier) or not
34 * tx - LED blinks on transmitted data
35 * rx - LED blinks on receive data
36 *
37 */
38
39struct led_netdev_data {
40 spinlock_t lock;
41
42 struct delayed_work work;
43 struct notifier_block notifier;
44
45 struct led_classdev *led_cdev;
46 struct net_device *net_dev;
47
48 char device_name[IFNAMSIZ];
49 atomic_t interval;
50 unsigned int last_activity;
51
52 unsigned long mode;
53#define NETDEV_LED_LINK 0
54#define NETDEV_LED_TX 1
55#define NETDEV_LED_RX 2
56#define NETDEV_LED_MODE_LINKUP 3
57};
58
59enum netdev_led_attr {
60 NETDEV_ATTR_LINK,
61 NETDEV_ATTR_TX,
62 NETDEV_ATTR_RX
63};
64
65static void set_baseline_state(struct led_netdev_data *trigger_data)
66{
67 int current_brightness;
68 struct led_classdev *led_cdev = trigger_data->led_cdev;
69
70 current_brightness = led_cdev->brightness;
71 if (current_brightness)
72 led_cdev->blink_brightness = current_brightness;
73 if (!led_cdev->blink_brightness)
74 led_cdev->blink_brightness = led_cdev->max_brightness;
75
76 if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
77 led_set_brightness(led_cdev, LED_OFF);
78 else {
79 if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
80 led_set_brightness(led_cdev,
81 led_cdev->blink_brightness);
82 else
83 led_set_brightness(led_cdev, LED_OFF);
84
85 /* If we are looking for RX/TX start periodically
86 * checking stats
87 */
88 if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
89 test_bit(NETDEV_LED_RX, &trigger_data->mode))
90 schedule_delayed_work(&trigger_data->work, 0);
91 }
92}
93
94static ssize_t device_name_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
96{
97 struct led_classdev *led_cdev = dev_get_drvdata(dev);
98 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
99 ssize_t len;
100
101 spin_lock_bh(&trigger_data->lock);
102 len = sprintf(buf, "%s\n", trigger_data->device_name);
103 spin_unlock_bh(&trigger_data->lock);
104
105 return len;
106}
107
108static ssize_t device_name_store(struct device *dev,
109 struct device_attribute *attr, const char *buf,
110 size_t size)
111{
112 struct led_classdev *led_cdev = dev_get_drvdata(dev);
113 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
114
115 if (size >= IFNAMSIZ)
116 return -EINVAL;
117
118 cancel_delayed_work_sync(&trigger_data->work);
119
120 spin_lock_bh(&trigger_data->lock);
121
122 if (trigger_data->net_dev) {
123 dev_put(trigger_data->net_dev);
124 trigger_data->net_dev = NULL;
125 }
126
127 strncpy(trigger_data->device_name, buf, size);
128 if (size > 0 && trigger_data->device_name[size - 1] == '\n')
129 trigger_data->device_name[size - 1] = 0;
130
131 if (trigger_data->device_name[0] != 0)
132 trigger_data->net_dev =
133 dev_get_by_name(&init_net, trigger_data->device_name);
134
135 clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
136 if (trigger_data->net_dev != NULL)
137 if (netif_carrier_ok(trigger_data->net_dev))
138 set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
139
140 trigger_data->last_activity = 0;
141
142 set_baseline_state(trigger_data);
143 spin_unlock_bh(&trigger_data->lock);
144
145 return size;
146}
147
148static DEVICE_ATTR_RW(device_name);
149
150static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
151 enum netdev_led_attr attr)
152{
153 struct led_classdev *led_cdev = dev_get_drvdata(dev);
154 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
155 int bit;
156
157 switch (attr) {
158 case NETDEV_ATTR_LINK:
159 bit = NETDEV_LED_LINK;
160 break;
161 case NETDEV_ATTR_TX:
162 bit = NETDEV_LED_TX;
163 break;
164 case NETDEV_ATTR_RX:
165 bit = NETDEV_LED_RX;
166 break;
167 default:
168 return -EINVAL;
169 }
170
171 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
172}
173
174static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
175 size_t size, enum netdev_led_attr attr)
176{
177 struct led_classdev *led_cdev = dev_get_drvdata(dev);
178 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
179 unsigned long state;
180 int ret;
181 int bit;
182
183 ret = kstrtoul(buf, 0, &state);
184 if (ret)
185 return ret;
186
187 switch (attr) {
188 case NETDEV_ATTR_LINK:
189 bit = NETDEV_LED_LINK;
190 break;
191 case NETDEV_ATTR_TX:
192 bit = NETDEV_LED_TX;
193 break;
194 case NETDEV_ATTR_RX:
195 bit = NETDEV_LED_RX;
196 break;
197 default:
198 return -EINVAL;
199 }
200
201 cancel_delayed_work_sync(&trigger_data->work);
202
203 if (state)
204 set_bit(bit, &trigger_data->mode);
205 else
206 clear_bit(bit, &trigger_data->mode);
207
208 set_baseline_state(trigger_data);
209
210 return size;
211}
212
213static ssize_t link_show(struct device *dev,
214 struct device_attribute *attr, char *buf)
215{
216 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
217}
218
219static ssize_t link_store(struct device *dev,
220 struct device_attribute *attr, const char *buf, size_t size)
221{
222 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
223}
224
225static DEVICE_ATTR_RW(link);
226
227static ssize_t tx_show(struct device *dev,
228 struct device_attribute *attr, char *buf)
229{
230 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
231}
232
233static ssize_t tx_store(struct device *dev,
234 struct device_attribute *attr, const char *buf, size_t size)
235{
236 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
237}
238
239static DEVICE_ATTR_RW(tx);
240
241static ssize_t rx_show(struct device *dev,
242 struct device_attribute *attr, char *buf)
243{
244 return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
245}
246
247static ssize_t rx_store(struct device *dev,
248 struct device_attribute *attr, const char *buf, size_t size)
249{
250 return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
251}
252
253static DEVICE_ATTR_RW(rx);
254
255static ssize_t interval_show(struct device *dev,
256 struct device_attribute *attr, char *buf)
257{
258 struct led_classdev *led_cdev = dev_get_drvdata(dev);
259 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
260
261 return sprintf(buf, "%u\n",
262 jiffies_to_msecs(atomic_read(&trigger_data->interval)));
263}
264
265static ssize_t interval_store(struct device *dev,
266 struct device_attribute *attr, const char *buf,
267 size_t size)
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 value;
272 int ret;
273
274 ret = kstrtoul(buf, 0, &value);
275 if (ret)
276 return ret;
277
278 /* impose some basic bounds on the timer interval */
279 if (value >= 5 && value <= 10000) {
280 cancel_delayed_work_sync(&trigger_data->work);
281
282 atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
283 set_baseline_state(trigger_data); /* resets timer */
284 }
285
286 return size;
287}
288
289static DEVICE_ATTR_RW(interval);
290
291static int netdev_trig_notify(struct notifier_block *nb,
292 unsigned long evt, void *dv)
293{
294 struct net_device *dev =
295 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
296 struct led_netdev_data *trigger_data = container_of(nb,
297 struct
298 led_netdev_data,
299 notifier);
300
301 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
302 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
303 && evt != NETDEV_CHANGENAME)
304 return NOTIFY_DONE;
305
306 if (strcmp(dev->name, trigger_data->device_name))
307 return NOTIFY_DONE;
308
309 cancel_delayed_work_sync(&trigger_data->work);
310
311 spin_lock_bh(&trigger_data->lock);
312
313 clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
314 switch (evt) {
315 case NETDEV_REGISTER:
316 if (trigger_data->net_dev)
317 dev_put(trigger_data->net_dev);
318 dev_hold(dev);
319 trigger_data->net_dev = dev;
320 break;
321 case NETDEV_CHANGENAME:
322 case NETDEV_UNREGISTER:
323 if (trigger_data->net_dev) {
324 dev_put(trigger_data->net_dev);
325 trigger_data->net_dev = NULL;
326 }
327 break;
328 case NETDEV_UP:
329 case NETDEV_CHANGE:
330 if (netif_carrier_ok(dev))
331 set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
332 break;
333 }
334
335 set_baseline_state(trigger_data);
336
337 spin_unlock_bh(&trigger_data->lock);
338
339 return NOTIFY_DONE;
340}
341
342/* here's the real work! */
343static void netdev_trig_work(struct work_struct *work)
344{
345 struct led_netdev_data *trigger_data = container_of(work,
346 struct
347 led_netdev_data,
348 work.work);
349 struct rtnl_link_stats64 *dev_stats;
350 unsigned int new_activity;
351 struct rtnl_link_stats64 temp;
352 unsigned long interval;
353 int invert;
354
355 /* If we dont have a device, insure we are off */
356 if (!trigger_data->net_dev) {
357 led_set_brightness(trigger_data->led_cdev, LED_OFF);
358 return;
359 }
360
361 /* If we are not looking for RX/TX then return */
362 if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
363 !test_bit(NETDEV_LED_RX, &trigger_data->mode))
364 return;
365
366 dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
367 new_activity =
368 (test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
369 dev_stats->tx_packets : 0) +
370 (test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
371 dev_stats->rx_packets : 0);
372
373 if (trigger_data->last_activity != new_activity) {
374 led_stop_software_blink(trigger_data->led_cdev);
375
376 invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
377 interval = jiffies_to_msecs(
378 atomic_read(&trigger_data->interval));
379 /* base state is ON (link present) */
380 led_blink_set_oneshot(trigger_data->led_cdev,
381 &interval,
382 &interval,
383 invert);
384 trigger_data->last_activity = new_activity;
385 }
386
387 schedule_delayed_work(&trigger_data->work,
388 (atomic_read(&trigger_data->interval)*2));
389}
390
391static void netdev_trig_activate(struct led_classdev *led_cdev)
392{
393 struct led_netdev_data *trigger_data;
394 int rc;
395
396 trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
397 if (!trigger_data)
398 return;
399
400 spin_lock_init(&trigger_data->lock);
401
402 trigger_data->notifier.notifier_call = netdev_trig_notify;
403 trigger_data->notifier.priority = 10;
404
405 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
406
407 trigger_data->led_cdev = led_cdev;
408 trigger_data->net_dev = NULL;
409 trigger_data->device_name[0] = 0;
410
411 trigger_data->mode = 0;
412 atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
413 trigger_data->last_activity = 0;
414
415 led_cdev->trigger_data = trigger_data;
416
417 rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
418 if (rc)
419 goto err_out;
420 rc = device_create_file(led_cdev->dev, &dev_attr_link);
421 if (rc)
422 goto err_out_device_name;
423 rc = device_create_file(led_cdev->dev, &dev_attr_rx);
424 if (rc)
425 goto err_out_link;
426 rc = device_create_file(led_cdev->dev, &dev_attr_tx);
427 if (rc)
428 goto err_out_rx;
429 rc = device_create_file(led_cdev->dev, &dev_attr_interval);
430 if (rc)
431 goto err_out_tx;
432 rc = register_netdevice_notifier(&trigger_data->notifier);
433 if (rc)
434 goto err_out_interval;
435 return;
436
437err_out_interval:
438 device_remove_file(led_cdev->dev, &dev_attr_interval);
439err_out_tx:
440 device_remove_file(led_cdev->dev, &dev_attr_tx);
441err_out_rx:
442 device_remove_file(led_cdev->dev, &dev_attr_rx);
443err_out_link:
444 device_remove_file(led_cdev->dev, &dev_attr_link);
445err_out_device_name:
446 device_remove_file(led_cdev->dev, &dev_attr_device_name);
447err_out:
448 led_cdev->trigger_data = NULL;
449 kfree(trigger_data);
450}
451
452static void netdev_trig_deactivate(struct led_classdev *led_cdev)
453{
454 struct led_netdev_data *trigger_data = led_cdev->trigger_data;
455
456 if (trigger_data) {
457 unregister_netdevice_notifier(&trigger_data->notifier);
458
459 device_remove_file(led_cdev->dev, &dev_attr_device_name);
460 device_remove_file(led_cdev->dev, &dev_attr_link);
461 device_remove_file(led_cdev->dev, &dev_attr_rx);
462 device_remove_file(led_cdev->dev, &dev_attr_tx);
463 device_remove_file(led_cdev->dev, &dev_attr_interval);
464
465 cancel_delayed_work_sync(&trigger_data->work);
466
467 if (trigger_data->net_dev)
468 dev_put(trigger_data->net_dev);
469
470 kfree(trigger_data);
471 }
472}
473
474static struct led_trigger netdev_led_trigger = {
475 .name = "netdev",
476 .activate = netdev_trig_activate,
477 .deactivate = netdev_trig_deactivate,
478};
479
480static int __init netdev_trig_init(void)
481{
482 return led_trigger_register(&netdev_led_trigger);
483}
484
485static void __exit netdev_trig_exit(void)
486{
487 led_trigger_unregister(&netdev_led_trigger);
488}
489
490module_init(netdev_trig_init);
491module_exit(netdev_trig_exit);
492
493MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
494MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
495MODULE_DESCRIPTION("Netdev LED trigger");
496MODULE_LICENSE("GPL v2");