2 * swconfig_led.c: LED trigger support for the switch configuration API
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
13 #ifdef CONFIG_SWCONFIG_LEDS
15 #include <linux/leds.h>
16 #include <linux/ctype.h>
17 #include <linux/device.h>
18 #include <linux/workqueue.h>
20 #define SWCONFIG_LED_TIMER_INTERVAL (HZ / 10)
21 #define SWCONFIG_LED_NUM_PORTS 32
23 #define SWCONFIG_LED_PORT_SPEED_NA 0x01 /* unknown speed */
24 #define SWCONFIG_LED_PORT_SPEED_10 0x02 /* 10 Mbps */
25 #define SWCONFIG_LED_PORT_SPEED_100 0x04 /* 100 Mbps */
26 #define SWCONFIG_LED_PORT_SPEED_1000 0x08 /* 1000 Mbps */
27 #define SWCONFIG_LED_PORT_SPEED_ALL (SWCONFIG_LED_PORT_SPEED_NA | \
28 SWCONFIG_LED_PORT_SPEED_10 | \
29 SWCONFIG_LED_PORT_SPEED_100 | \
30 SWCONFIG_LED_PORT_SPEED_1000)
32 #define SWCONFIG_LED_MODE_LINK 0x01
33 #define SWCONFIG_LED_MODE_TX 0x02
34 #define SWCONFIG_LED_MODE_RX 0x04
35 #define SWCONFIG_LED_MODE_TXRX (SWCONFIG_LED_MODE_TX | \
37 #define SWCONFIG_LED_MODE_ALL (SWCONFIG_LED_MODE_LINK | \
38 SWCONFIG_LED_MODE_TX | \
41 struct switch_led_trigger {
42 struct led_trigger trig;
43 struct switch_dev *swdev;
45 struct delayed_work sw_led_work;
48 unsigned long long port_tx_traffic[SWCONFIG_LED_NUM_PORTS];
49 unsigned long long port_rx_traffic[SWCONFIG_LED_NUM_PORTS];
50 u8 link_speed[SWCONFIG_LED_NUM_PORTS];
53 struct swconfig_trig_data {
54 struct led_classdev *led_cdev;
55 struct switch_dev *swdev;
61 unsigned long prev_traffic;
62 enum led_brightness prev_brightness;
68 swconfig_trig_set_brightness(struct swconfig_trig_data *trig_data,
69 enum led_brightness brightness)
71 led_set_brightness(trig_data->led_cdev, brightness);
72 trig_data->prev_brightness = brightness;
76 swconfig_trig_update_port_mask(struct led_trigger *trigger)
78 struct list_head *entry;
79 struct switch_led_trigger *sw_trig;
85 sw_trig = (void *) trigger;
88 read_lock(&trigger->leddev_list_lock);
89 list_for_each(entry, &trigger->led_cdevs) {
90 struct led_classdev *led_cdev;
91 struct swconfig_trig_data *trig_data;
93 led_cdev = list_entry(entry, struct led_classdev, trig_list);
94 trig_data = led_cdev->trigger_data;
96 read_lock(&trig_data->lock);
97 port_mask |= trig_data->port_mask;
98 read_unlock(&trig_data->lock);
101 read_unlock(&trigger->leddev_list_lock);
103 sw_trig->port_mask = port_mask;
106 schedule_delayed_work(&sw_trig->sw_led_work,
107 SWCONFIG_LED_TIMER_INTERVAL);
109 cancel_delayed_work_sync(&sw_trig->sw_led_work);
113 swconfig_trig_port_mask_store(struct device *dev, struct device_attribute *attr,
114 const char *buf, size_t size)
116 struct led_classdev *led_cdev = dev_get_drvdata(dev);
117 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
118 unsigned long port_mask;
122 ret = kstrtoul(buf, 0, &port_mask);
126 write_lock(&trig_data->lock);
127 changed = (trig_data->port_mask != port_mask);
128 trig_data->port_mask = port_mask;
129 write_unlock(&trig_data->lock);
133 swconfig_trig_set_brightness(trig_data, LED_OFF);
135 swconfig_trig_update_port_mask(led_cdev->trigger);
142 swconfig_trig_port_mask_show(struct device *dev, struct device_attribute *attr,
145 struct led_classdev *led_cdev = dev_get_drvdata(dev);
146 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
149 read_lock(&trig_data->lock);
150 port_mask = trig_data->port_mask;
151 read_unlock(&trig_data->lock);
153 sprintf(buf, "%#x\n", port_mask);
155 return strlen(buf) + 1;
158 static DEVICE_ATTR(port_mask, 0644, swconfig_trig_port_mask_show,
159 swconfig_trig_port_mask_store);
161 /* speed_mask file handler - display value */
162 static ssize_t swconfig_trig_speed_mask_show(struct device *dev,
163 struct device_attribute *attr,
166 struct led_classdev *led_cdev = dev_get_drvdata(dev);
167 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
170 read_lock(&trig_data->lock);
171 speed_mask = trig_data->speed_mask;
172 read_unlock(&trig_data->lock);
174 sprintf(buf, "%#x\n", speed_mask);
176 return strlen(buf) + 1;
179 /* speed_mask file handler - store value */
180 static ssize_t swconfig_trig_speed_mask_store(struct device *dev,
181 struct device_attribute *attr,
182 const char *buf, size_t size)
184 struct led_classdev *led_cdev = dev_get_drvdata(dev);
185 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
189 ret = kstrtou8(buf, 0, &speed_mask);
193 write_lock(&trig_data->lock);
194 trig_data->speed_mask = speed_mask & SWCONFIG_LED_PORT_SPEED_ALL;
195 write_unlock(&trig_data->lock);
200 /* speed_mask special file */
201 static DEVICE_ATTR(speed_mask, 0644, swconfig_trig_speed_mask_show,
202 swconfig_trig_speed_mask_store);
204 static ssize_t swconfig_trig_mode_show(struct device *dev,
205 struct device_attribute *attr, char *buf)
207 struct led_classdev *led_cdev = dev_get_drvdata(dev);
208 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
211 read_lock(&trig_data->lock);
212 mode = trig_data->mode;
213 read_unlock(&trig_data->lock);
216 strcpy(buf, "none\n");
218 if (mode & SWCONFIG_LED_MODE_LINK)
219 strcat(buf, "link ");
220 if (mode & SWCONFIG_LED_MODE_TX)
222 if (mode & SWCONFIG_LED_MODE_RX)
227 return strlen(buf)+1;
230 static ssize_t swconfig_trig_mode_store(struct device *dev,
231 struct device_attribute *attr, const char *buf, size_t size)
233 struct led_classdev *led_cdev = dev_get_drvdata(dev);
234 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
239 /* take a copy since we don't want to trash the inbound buffer when using strsep */
240 strncpy(copybuf, buf, sizeof(copybuf));
241 copybuf[sizeof(copybuf) - 1] = 0;
244 while ((token = strsep(&p, " \t\n")) != NULL) {
251 if (!strcmp(token, "none"))
253 else if (!strcmp(token, "tx"))
254 new_mode |= SWCONFIG_LED_MODE_TX;
255 else if (!strcmp(token, "rx"))
256 new_mode |= SWCONFIG_LED_MODE_RX;
257 else if (!strcmp(token, "link"))
258 new_mode |= SWCONFIG_LED_MODE_LINK;
266 write_lock(&trig_data->lock);
267 trig_data->mode = (u8)new_mode;
268 write_unlock(&trig_data->lock);
273 /* mode special file */
274 static DEVICE_ATTR(mode, 0644, swconfig_trig_mode_show,
275 swconfig_trig_mode_store);
278 swconfig_trig_activate(struct led_classdev *led_cdev)
280 struct switch_led_trigger *sw_trig;
281 struct swconfig_trig_data *trig_data;
284 if (led_cdev->trigger->activate != swconfig_trig_activate)
287 trig_data = kzalloc(sizeof(struct swconfig_trig_data), GFP_KERNEL);
291 sw_trig = (void *) led_cdev->trigger;
293 rwlock_init(&trig_data->lock);
294 trig_data->led_cdev = led_cdev;
295 trig_data->swdev = sw_trig->swdev;
296 trig_data->speed_mask = SWCONFIG_LED_PORT_SPEED_ALL;
297 trig_data->mode = SWCONFIG_LED_MODE_ALL;
298 led_cdev->trigger_data = trig_data;
300 err = device_create_file(led_cdev->dev, &dev_attr_port_mask);
304 err = device_create_file(led_cdev->dev, &dev_attr_speed_mask);
308 err = device_create_file(led_cdev->dev, &dev_attr_mode);
315 device_remove_file(led_cdev->dev, &dev_attr_speed_mask);
318 device_remove_file(led_cdev->dev, &dev_attr_port_mask);
321 led_cdev->trigger_data = NULL;
326 swconfig_trig_deactivate(struct led_classdev *led_cdev)
328 struct swconfig_trig_data *trig_data;
330 swconfig_trig_update_port_mask(led_cdev->trigger);
332 trig_data = (void *) led_cdev->trigger_data;
334 device_remove_file(led_cdev->dev, &dev_attr_port_mask);
335 device_remove_file(led_cdev->dev, &dev_attr_speed_mask);
336 device_remove_file(led_cdev->dev, &dev_attr_mode);
342 * link off -> led off (can't be any other reason to turn it on)
344 * mode link: led on by default only if speed matches, else off
345 * mode txrx: blink only if speed matches, else off
348 swconfig_trig_led_event(struct switch_led_trigger *sw_trig,
349 struct led_classdev *led_cdev)
351 struct swconfig_trig_data *trig_data;
355 enum led_brightness led_base, led_blink;
357 trig_data = led_cdev->trigger_data;
361 read_lock(&trig_data->lock);
362 port_mask = trig_data->port_mask;
363 speed_mask = trig_data->speed_mask;
364 mode = trig_data->mode;
365 read_unlock(&trig_data->lock);
367 link = !!(sw_trig->port_link & port_mask);
369 if (trig_data->prev_brightness != LED_OFF)
370 swconfig_trig_set_brightness(trig_data, LED_OFF); /* and stop */
373 unsigned long traffic;
374 int speedok; /* link speed flag */
381 for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
382 if (port_mask & (1 << i)) {
383 if (sw_trig->link_speed[i] & speed_mask) {
384 traffic += ((mode & SWCONFIG_LED_MODE_TX) ?
385 sw_trig->port_tx_traffic[i] : 0) +
386 ((mode & SWCONFIG_LED_MODE_RX) ?
387 sw_trig->port_rx_traffic[i] : 0);
394 /* At least one port speed matches speed_mask */
395 if (!(mode & SWCONFIG_LED_MODE_LINK)) {
397 led_blink = LED_FULL;
400 if (trig_data->prev_brightness != led_base)
401 swconfig_trig_set_brightness(trig_data,
403 else if (traffic != trig_data->prev_traffic)
404 swconfig_trig_set_brightness(trig_data,
406 } else if (trig_data->prev_brightness != LED_OFF)
407 swconfig_trig_set_brightness(trig_data, LED_OFF);
409 trig_data->prev_traffic = traffic;
412 trig_data->prev_link = link;
416 swconfig_trig_update_leds(struct switch_led_trigger *sw_trig)
418 struct list_head *entry;
419 struct led_trigger *trigger;
421 trigger = &sw_trig->trig;
422 read_lock(&trigger->leddev_list_lock);
423 list_for_each(entry, &trigger->led_cdevs) {
424 struct led_classdev *led_cdev;
426 led_cdev = list_entry(entry, struct led_classdev, trig_list);
427 swconfig_trig_led_event(sw_trig, led_cdev);
429 read_unlock(&trigger->leddev_list_lock);
433 swconfig_led_work_func(struct work_struct *work)
435 struct switch_led_trigger *sw_trig;
436 struct switch_dev *swdev;
441 sw_trig = container_of(work, struct switch_led_trigger,
444 port_mask = sw_trig->port_mask;
445 swdev = sw_trig->swdev;
448 for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
451 sw_trig->link_speed[i] = 0;
454 if ((port_mask & port_bit) == 0)
457 if (swdev->ops->get_port_link) {
458 struct switch_port_link port_link;
460 memset(&port_link, '\0', sizeof(port_link));
461 swdev->ops->get_port_link(swdev, i, &port_link);
463 if (port_link.link) {
465 switch (port_link.speed) {
466 case SWITCH_PORT_SPEED_UNKNOWN:
467 sw_trig->link_speed[i] =
468 SWCONFIG_LED_PORT_SPEED_NA;
470 case SWITCH_PORT_SPEED_10:
471 sw_trig->link_speed[i] =
472 SWCONFIG_LED_PORT_SPEED_10;
474 case SWITCH_PORT_SPEED_100:
475 sw_trig->link_speed[i] =
476 SWCONFIG_LED_PORT_SPEED_100;
478 case SWITCH_PORT_SPEED_1000:
479 sw_trig->link_speed[i] =
480 SWCONFIG_LED_PORT_SPEED_1000;
486 if (swdev->ops->get_port_stats) {
487 struct switch_port_stats port_stats;
489 memset(&port_stats, '\0', sizeof(port_stats));
490 swdev->ops->get_port_stats(swdev, i, &port_stats);
491 sw_trig->port_tx_traffic[i] = port_stats.tx_bytes;
492 sw_trig->port_rx_traffic[i] = port_stats.rx_bytes;
496 sw_trig->port_link = link;
498 swconfig_trig_update_leds(sw_trig);
500 schedule_delayed_work(&sw_trig->sw_led_work,
501 SWCONFIG_LED_TIMER_INTERVAL);
505 swconfig_create_led_trigger(struct switch_dev *swdev)
507 struct switch_led_trigger *sw_trig;
510 if (!swdev->ops->get_port_link)
513 sw_trig = kzalloc(sizeof(struct switch_led_trigger), GFP_KERNEL);
517 sw_trig->swdev = swdev;
518 sw_trig->trig.name = swdev->devname;
519 sw_trig->trig.activate = swconfig_trig_activate;
520 sw_trig->trig.deactivate = swconfig_trig_deactivate;
522 INIT_DELAYED_WORK(&sw_trig->sw_led_work, swconfig_led_work_func);
524 err = led_trigger_register(&sw_trig->trig);
528 swdev->led_trigger = sw_trig;
538 swconfig_destroy_led_trigger(struct switch_dev *swdev)
540 struct switch_led_trigger *sw_trig;
542 sw_trig = swdev->led_trigger;
544 cancel_delayed_work_sync(&sw_trig->sw_led_work);
545 led_trigger_unregister(&sw_trig->trig);
550 #else /* SWCONFIG_LEDS */
552 swconfig_create_led_trigger(struct switch_dev *swdev) { return 0; }
555 swconfig_destroy_led_trigger(struct switch_dev *swdev) { }
556 #endif /* CONFIG_SWCONFIG_LEDS */