xref: /openbmc/linux/net/mac80211/led.c (revision 9134211f)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2006, Johannes Berg <johannes@sipsolutions.net>
4  */
5 
6 /* just for IFNAMSIZ */
7 #include <linux/if.h>
8 #include <linux/slab.h>
9 #include <linux/export.h>
10 #include "led.h"
11 
12 void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)
13 {
14 	if (!atomic_read(&local->assoc_led_active))
15 		return;
16 	if (associated)
17 		led_trigger_event(&local->assoc_led, LED_FULL);
18 	else
19 		led_trigger_event(&local->assoc_led, LED_OFF);
20 }
21 
22 void ieee80211_led_radio(struct ieee80211_local *local, bool enabled)
23 {
24 	if (!atomic_read(&local->radio_led_active))
25 		return;
26 	if (enabled)
27 		led_trigger_event(&local->radio_led, LED_FULL);
28 	else
29 		led_trigger_event(&local->radio_led, LED_OFF);
30 }
31 
32 void ieee80211_alloc_led_names(struct ieee80211_local *local)
33 {
34 	local->rx_led.name = kasprintf(GFP_KERNEL, "%srx",
35 				       wiphy_name(local->hw.wiphy));
36 	local->tx_led.name = kasprintf(GFP_KERNEL, "%stx",
37 				       wiphy_name(local->hw.wiphy));
38 	local->assoc_led.name = kasprintf(GFP_KERNEL, "%sassoc",
39 					  wiphy_name(local->hw.wiphy));
40 	local->radio_led.name = kasprintf(GFP_KERNEL, "%sradio",
41 					  wiphy_name(local->hw.wiphy));
42 }
43 
44 void ieee80211_free_led_names(struct ieee80211_local *local)
45 {
46 	kfree(local->rx_led.name);
47 	kfree(local->tx_led.name);
48 	kfree(local->assoc_led.name);
49 	kfree(local->radio_led.name);
50 }
51 
52 static int ieee80211_tx_led_activate(struct led_classdev *led_cdev)
53 {
54 	struct ieee80211_local *local = container_of(led_cdev->trigger,
55 						     struct ieee80211_local,
56 						     tx_led);
57 
58 	atomic_inc(&local->tx_led_active);
59 
60 	return 0;
61 }
62 
63 static void ieee80211_tx_led_deactivate(struct led_classdev *led_cdev)
64 {
65 	struct ieee80211_local *local = container_of(led_cdev->trigger,
66 						     struct ieee80211_local,
67 						     tx_led);
68 
69 	atomic_dec(&local->tx_led_active);
70 }
71 
72 static int ieee80211_rx_led_activate(struct led_classdev *led_cdev)
73 {
74 	struct ieee80211_local *local = container_of(led_cdev->trigger,
75 						     struct ieee80211_local,
76 						     rx_led);
77 
78 	atomic_inc(&local->rx_led_active);
79 
80 	return 0;
81 }
82 
83 static void ieee80211_rx_led_deactivate(struct led_classdev *led_cdev)
84 {
85 	struct ieee80211_local *local = container_of(led_cdev->trigger,
86 						     struct ieee80211_local,
87 						     rx_led);
88 
89 	atomic_dec(&local->rx_led_active);
90 }
91 
92 static int ieee80211_assoc_led_activate(struct led_classdev *led_cdev)
93 {
94 	struct ieee80211_local *local = container_of(led_cdev->trigger,
95 						     struct ieee80211_local,
96 						     assoc_led);
97 
98 	atomic_inc(&local->assoc_led_active);
99 
100 	return 0;
101 }
102 
103 static void ieee80211_assoc_led_deactivate(struct led_classdev *led_cdev)
104 {
105 	struct ieee80211_local *local = container_of(led_cdev->trigger,
106 						     struct ieee80211_local,
107 						     assoc_led);
108 
109 	atomic_dec(&local->assoc_led_active);
110 }
111 
112 static int ieee80211_radio_led_activate(struct led_classdev *led_cdev)
113 {
114 	struct ieee80211_local *local = container_of(led_cdev->trigger,
115 						     struct ieee80211_local,
116 						     radio_led);
117 
118 	atomic_inc(&local->radio_led_active);
119 
120 	return 0;
121 }
122 
123 static void ieee80211_radio_led_deactivate(struct led_classdev *led_cdev)
124 {
125 	struct ieee80211_local *local = container_of(led_cdev->trigger,
126 						     struct ieee80211_local,
127 						     radio_led);
128 
129 	atomic_dec(&local->radio_led_active);
130 }
131 
132 static int ieee80211_tpt_led_activate(struct led_classdev *led_cdev)
133 {
134 	struct ieee80211_local *local = container_of(led_cdev->trigger,
135 						     struct ieee80211_local,
136 						     tpt_led);
137 
138 	atomic_inc(&local->tpt_led_active);
139 
140 	return 0;
141 }
142 
143 static void ieee80211_tpt_led_deactivate(struct led_classdev *led_cdev)
144 {
145 	struct ieee80211_local *local = container_of(led_cdev->trigger,
146 						     struct ieee80211_local,
147 						     tpt_led);
148 
149 	atomic_dec(&local->tpt_led_active);
150 }
151 
152 void ieee80211_led_init(struct ieee80211_local *local)
153 {
154 	atomic_set(&local->rx_led_active, 0);
155 	local->rx_led.activate = ieee80211_rx_led_activate;
156 	local->rx_led.deactivate = ieee80211_rx_led_deactivate;
157 	if (local->rx_led.name && led_trigger_register(&local->rx_led)) {
158 		kfree(local->rx_led.name);
159 		local->rx_led.name = NULL;
160 	}
161 
162 	atomic_set(&local->tx_led_active, 0);
163 	local->tx_led.activate = ieee80211_tx_led_activate;
164 	local->tx_led.deactivate = ieee80211_tx_led_deactivate;
165 	if (local->tx_led.name && led_trigger_register(&local->tx_led)) {
166 		kfree(local->tx_led.name);
167 		local->tx_led.name = NULL;
168 	}
169 
170 	atomic_set(&local->assoc_led_active, 0);
171 	local->assoc_led.activate = ieee80211_assoc_led_activate;
172 	local->assoc_led.deactivate = ieee80211_assoc_led_deactivate;
173 	if (local->assoc_led.name && led_trigger_register(&local->assoc_led)) {
174 		kfree(local->assoc_led.name);
175 		local->assoc_led.name = NULL;
176 	}
177 
178 	atomic_set(&local->radio_led_active, 0);
179 	local->radio_led.activate = ieee80211_radio_led_activate;
180 	local->radio_led.deactivate = ieee80211_radio_led_deactivate;
181 	if (local->radio_led.name && led_trigger_register(&local->radio_led)) {
182 		kfree(local->radio_led.name);
183 		local->radio_led.name = NULL;
184 	}
185 
186 	atomic_set(&local->tpt_led_active, 0);
187 	if (local->tpt_led_trigger) {
188 		local->tpt_led.activate = ieee80211_tpt_led_activate;
189 		local->tpt_led.deactivate = ieee80211_tpt_led_deactivate;
190 		if (led_trigger_register(&local->tpt_led)) {
191 			kfree(local->tpt_led_trigger);
192 			local->tpt_led_trigger = NULL;
193 		}
194 	}
195 }
196 
197 void ieee80211_led_exit(struct ieee80211_local *local)
198 {
199 	if (local->radio_led.name)
200 		led_trigger_unregister(&local->radio_led);
201 	if (local->assoc_led.name)
202 		led_trigger_unregister(&local->assoc_led);
203 	if (local->tx_led.name)
204 		led_trigger_unregister(&local->tx_led);
205 	if (local->rx_led.name)
206 		led_trigger_unregister(&local->rx_led);
207 
208 	if (local->tpt_led_trigger) {
209 		led_trigger_unregister(&local->tpt_led);
210 		kfree(local->tpt_led_trigger);
211 	}
212 }
213 
214 const char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
215 {
216 	struct ieee80211_local *local = hw_to_local(hw);
217 
218 	return local->radio_led.name;
219 }
220 EXPORT_SYMBOL(__ieee80211_get_radio_led_name);
221 
222 const char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
223 {
224 	struct ieee80211_local *local = hw_to_local(hw);
225 
226 	return local->assoc_led.name;
227 }
228 EXPORT_SYMBOL(__ieee80211_get_assoc_led_name);
229 
230 const char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
231 {
232 	struct ieee80211_local *local = hw_to_local(hw);
233 
234 	return local->tx_led.name;
235 }
236 EXPORT_SYMBOL(__ieee80211_get_tx_led_name);
237 
238 const char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
239 {
240 	struct ieee80211_local *local = hw_to_local(hw);
241 
242 	return local->rx_led.name;
243 }
244 EXPORT_SYMBOL(__ieee80211_get_rx_led_name);
245 
246 static unsigned long tpt_trig_traffic(struct ieee80211_local *local,
247 				      struct tpt_led_trigger *tpt_trig)
248 {
249 	unsigned long traffic, delta;
250 
251 	traffic = tpt_trig->tx_bytes + tpt_trig->rx_bytes;
252 
253 	delta = traffic - tpt_trig->prev_traffic;
254 	tpt_trig->prev_traffic = traffic;
255 	return DIV_ROUND_UP(delta, 1024 / 8);
256 }
257 
258 static void tpt_trig_timer(struct timer_list *t)
259 {
260 	struct tpt_led_trigger *tpt_trig = from_timer(tpt_trig, t, timer);
261 	struct ieee80211_local *local = tpt_trig->local;
262 	unsigned long on, off, tpt;
263 	int i;
264 
265 	if (!tpt_trig->running)
266 		return;
267 
268 	mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
269 
270 	tpt = tpt_trig_traffic(local, tpt_trig);
271 
272 	/* default to just solid on */
273 	on = 1;
274 	off = 0;
275 
276 	for (i = tpt_trig->blink_table_len - 1; i >= 0; i--) {
277 		if (tpt_trig->blink_table[i].throughput < 0 ||
278 		    tpt > tpt_trig->blink_table[i].throughput) {
279 			off = tpt_trig->blink_table[i].blink_time / 2;
280 			on = tpt_trig->blink_table[i].blink_time - off;
281 			break;
282 		}
283 	}
284 
285 	led_trigger_blink(&local->tpt_led, on, off);
286 }
287 
288 const char *
289 __ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
290 				   unsigned int flags,
291 				   const struct ieee80211_tpt_blink *blink_table,
292 				   unsigned int blink_table_len)
293 {
294 	struct ieee80211_local *local = hw_to_local(hw);
295 	struct tpt_led_trigger *tpt_trig;
296 
297 	if (WARN_ON(local->tpt_led_trigger))
298 		return NULL;
299 
300 	tpt_trig = kzalloc(sizeof(struct tpt_led_trigger), GFP_KERNEL);
301 	if (!tpt_trig)
302 		return NULL;
303 
304 	snprintf(tpt_trig->name, sizeof(tpt_trig->name),
305 		 "%stpt", wiphy_name(local->hw.wiphy));
306 
307 	local->tpt_led.name = tpt_trig->name;
308 
309 	tpt_trig->blink_table = blink_table;
310 	tpt_trig->blink_table_len = blink_table_len;
311 	tpt_trig->want = flags;
312 	tpt_trig->local = local;
313 
314 	timer_setup(&tpt_trig->timer, tpt_trig_timer, 0);
315 
316 	local->tpt_led_trigger = tpt_trig;
317 
318 	return tpt_trig->name;
319 }
320 EXPORT_SYMBOL(__ieee80211_create_tpt_led_trigger);
321 
322 static void ieee80211_start_tpt_led_trig(struct ieee80211_local *local)
323 {
324 	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
325 
326 	if (tpt_trig->running)
327 		return;
328 
329 	/* reset traffic */
330 	tpt_trig_traffic(local, tpt_trig);
331 	tpt_trig->running = true;
332 
333 	tpt_trig_timer(&tpt_trig->timer);
334 	mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
335 }
336 
337 static void ieee80211_stop_tpt_led_trig(struct ieee80211_local *local)
338 {
339 	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
340 
341 	if (!tpt_trig->running)
342 		return;
343 
344 	tpt_trig->running = false;
345 	del_timer_sync(&tpt_trig->timer);
346 
347 	led_trigger_event(&local->tpt_led, LED_OFF);
348 }
349 
350 void ieee80211_mod_tpt_led_trig(struct ieee80211_local *local,
351 				unsigned int types_on, unsigned int types_off)
352 {
353 	struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
354 	bool allowed;
355 
356 	WARN_ON(types_on & types_off);
357 
358 	if (!tpt_trig)
359 		return;
360 
361 	tpt_trig->active &= ~types_off;
362 	tpt_trig->active |= types_on;
363 
364 	/*
365 	 * Regardless of wanted state, we shouldn't blink when
366 	 * the radio is disabled -- this can happen due to some
367 	 * code ordering issues with __ieee80211_recalc_idle()
368 	 * being called before the radio is started.
369 	 */
370 	allowed = tpt_trig->active & IEEE80211_TPT_LEDTRIG_FL_RADIO;
371 
372 	if (!allowed || !(tpt_trig->active & tpt_trig->want))
373 		ieee80211_stop_tpt_led_trig(local);
374 	else
375 		ieee80211_start_tpt_led_trig(local);
376 }
377