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 struct switch_led_trigger {
24 struct led_trigger trig;
25 struct switch_dev *swdev;
27 struct delayed_work sw_led_work;
30 unsigned long port_traffic[SWCONFIG_LED_NUM_PORTS];
33 struct swconfig_trig_data {
34 struct led_classdev *led_cdev;
35 struct switch_dev *swdev;
41 unsigned long prev_traffic;
42 enum led_brightness prev_brightness;
46 swconfig_trig_set_brightness(struct swconfig_trig_data *trig_data,
47 enum led_brightness brightness)
49 led_set_brightness(trig_data->led_cdev, brightness);
50 trig_data->prev_brightness = brightness;
54 swconfig_trig_update_port_mask(struct led_trigger *trigger)
56 struct list_head *entry;
57 struct switch_led_trigger *sw_trig;
63 sw_trig = (void *) trigger;
66 read_lock(&trigger->leddev_list_lock);
67 list_for_each(entry, &trigger->led_cdevs) {
68 struct led_classdev *led_cdev;
69 struct swconfig_trig_data *trig_data;
71 led_cdev = list_entry(entry, struct led_classdev, trig_list);
72 trig_data = led_cdev->trigger_data;
74 read_lock(&trig_data->lock);
75 port_mask |= trig_data->port_mask;
76 read_unlock(&trig_data->lock);
79 read_unlock(&trigger->leddev_list_lock);
81 sw_trig->port_mask = port_mask;
84 schedule_delayed_work(&sw_trig->sw_led_work,
85 SWCONFIG_LED_TIMER_INTERVAL);
87 cancel_delayed_work_sync(&sw_trig->sw_led_work);
91 swconfig_trig_port_mask_store(struct device *dev, struct device_attribute *attr,
92 const char *buf, size_t size)
94 struct led_classdev *led_cdev = dev_get_drvdata(dev);
95 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
96 unsigned long port_mask;
100 ret = kstrtoul(buf, 0, &port_mask);
104 write_lock(&trig_data->lock);
106 changed = (trig_data->port_mask != port_mask);
108 trig_data->port_mask = port_mask;
110 swconfig_trig_set_brightness(trig_data, LED_OFF);
113 write_unlock(&trig_data->lock);
116 swconfig_trig_update_port_mask(led_cdev->trigger);
122 swconfig_trig_port_mask_show(struct device *dev, struct device_attribute *attr,
125 struct led_classdev *led_cdev = dev_get_drvdata(dev);
126 struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
128 read_lock(&trig_data->lock);
129 sprintf(buf, "%#x\n", trig_data->port_mask);
130 read_unlock(&trig_data->lock);
132 return strlen(buf) + 1;
135 static DEVICE_ATTR(port_mask, 0644, swconfig_trig_port_mask_show,
136 swconfig_trig_port_mask_store);
139 swconfig_trig_activate(struct led_classdev *led_cdev)
141 struct switch_led_trigger *sw_trig;
142 struct swconfig_trig_data *trig_data;
145 if (led_cdev->trigger->activate != swconfig_trig_activate)
148 trig_data = kzalloc(sizeof(struct swconfig_trig_data), GFP_KERNEL);
152 sw_trig = (void *) led_cdev->trigger;
154 rwlock_init(&trig_data->lock);
155 trig_data->led_cdev = led_cdev;
156 trig_data->swdev = sw_trig->swdev;
157 led_cdev->trigger_data = trig_data;
159 err = device_create_file(led_cdev->dev, &dev_attr_port_mask);
166 led_cdev->trigger_data = NULL;
171 swconfig_trig_deactivate(struct led_classdev *led_cdev)
173 struct swconfig_trig_data *trig_data;
175 swconfig_trig_update_port_mask(led_cdev->trigger);
177 trig_data = (void *) led_cdev->trigger_data;
179 device_remove_file(led_cdev->dev, &dev_attr_port_mask);
185 swconfig_trig_led_event(struct switch_led_trigger *sw_trig,
186 struct led_classdev *led_cdev)
188 struct swconfig_trig_data *trig_data;
192 trig_data = led_cdev->trigger_data;
196 read_lock(&trig_data->lock);
197 port_mask = trig_data->port_mask;
198 read_unlock(&trig_data->lock);
200 link = !!(sw_trig->port_link & port_mask);
202 if (link != trig_data->prev_link)
203 swconfig_trig_set_brightness(trig_data, LED_OFF);
205 unsigned long traffic;
209 for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
210 if (port_mask & (1 << i))
211 traffic += sw_trig->port_traffic[i];
214 if (trig_data->prev_brightness != LED_FULL)
215 swconfig_trig_set_brightness(trig_data, LED_FULL);
216 else if (traffic != trig_data->prev_traffic)
217 swconfig_trig_set_brightness(trig_data, LED_OFF);
219 trig_data->prev_traffic = traffic;
222 trig_data->prev_link = link;
226 swconfig_trig_update_leds(struct switch_led_trigger *sw_trig)
228 struct list_head *entry;
229 struct led_trigger *trigger;
231 trigger = &sw_trig->trig;
232 read_lock(&trigger->leddev_list_lock);
233 list_for_each(entry, &trigger->led_cdevs) {
234 struct led_classdev *led_cdev;
236 led_cdev = list_entry(entry, struct led_classdev, trig_list);
237 swconfig_trig_led_event(sw_trig, led_cdev);
239 read_unlock(&trigger->leddev_list_lock);
243 swconfig_led_work_func(struct work_struct *work)
245 struct switch_led_trigger *sw_trig;
246 struct switch_dev *swdev;
251 sw_trig = container_of(work, struct switch_led_trigger,
254 port_mask = sw_trig->port_mask;
255 swdev = sw_trig->swdev;
258 for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
262 if ((port_mask & port_bit) == 0)
265 if (swdev->ops->get_port_link) {
266 struct switch_port_link port_link;
268 memset(&port_link, '\0', sizeof(port_link));
269 swdev->ops->get_port_link(swdev, i, &port_link);
275 if (swdev->ops->get_port_stats) {
276 struct switch_port_stats port_stats;
278 memset(&port_stats, '\0', sizeof(port_stats));
279 swdev->ops->get_port_stats(swdev, i, &port_stats);
280 sw_trig->port_traffic[i] = port_stats.tx_bytes +
285 sw_trig->port_link = link;
287 swconfig_trig_update_leds(sw_trig);
289 schedule_delayed_work(&sw_trig->sw_led_work,
290 SWCONFIG_LED_TIMER_INTERVAL);
294 swconfig_create_led_trigger(struct switch_dev *swdev)
296 struct switch_led_trigger *sw_trig;
299 if (!swdev->ops->get_port_link)
302 sw_trig = kzalloc(sizeof(struct switch_led_trigger), GFP_KERNEL);
306 sw_trig->swdev = swdev;
307 sw_trig->trig.name = swdev->devname;
308 sw_trig->trig.activate = swconfig_trig_activate;
309 sw_trig->trig.deactivate = swconfig_trig_deactivate;
311 INIT_DELAYED_WORK(&sw_trig->sw_led_work, swconfig_led_work_func);
313 err = led_trigger_register(&sw_trig->trig);
317 swdev->led_trigger = sw_trig;
327 swconfig_destroy_led_trigger(struct switch_dev *swdev)
329 struct switch_led_trigger *sw_trig;
331 sw_trig = swdev->led_trigger;
333 cancel_delayed_work_sync(&sw_trig->sw_led_work);
334 led_trigger_unregister(&sw_trig->trig);
339 #else /* SWCONFIG_LEDS */
341 swconfig_create_led_trigger(struct switch_dev *swdev) { return 0; }
344 swconfig_destroy_led_trigger(struct switch_dev *swdev) { }
345 #endif /* CONFIG_SWCONFIG_LEDS */