net/mac80211/led.c

   1 /*
   2  * Copyright 2006, Johannes Berg <johannes@sipsolutions.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /* just for IFNAMSIZ */
  10 #include <linux/if.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include "led.h"
  14
  15 void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)
  16 {
  17         if (!atomic_read(&local->assoc_led_active))
  18                 return;
  19         if (associated)
  20                 led_trigger_event(&local->assoc_led, LED_FULL);
  21         else
  22                 led_trigger_event(&local->assoc_led, LED_OFF);
  23 }
  24
  25 void ieee80211_led_radio(struct ieee80211_local *local, bool enabled)
  26 {
  27         if (!atomic_read(&local->radio_led_active))
  28                 return;
  29         if (enabled)
  30                 led_trigger_event(&local->radio_led, LED_FULL);
  31         else
  32                 led_trigger_event(&local->radio_led, LED_OFF);
  33 }
  34
  35 void ieee80211_alloc_led_names(struct ieee80211_local *local)
  36 {
  37         local->rx_led.name = kasprintf(GFP_KERNEL, "%srx",
  38                                        wiphy_name(local->hw.wiphy));
  39         local->tx_led.name = kasprintf(GFP_KERNEL, "%stx",
  40                                        wiphy_name(local->hw.wiphy));
  41         local->assoc_led.name = kasprintf(GFP_KERNEL, "%sassoc",
  42                                           wiphy_name(local->hw.wiphy));
  43         local->radio_led.name = kasprintf(GFP_KERNEL, "%sradio",
  44                                           wiphy_name(local->hw.wiphy));
  45 }
  46
  47 void ieee80211_free_led_names(struct ieee80211_local *local)
  48 {
  49         kfree(local->rx_led.name);
  50         kfree(local->tx_led.name);
  51         kfree(local->assoc_led.name);
  52         kfree(local->radio_led.name);
  53 }
  54
  55 static int ieee80211_tx_led_activate(struct led_classdev *led_cdev)
  56 {
  57         struct ieee80211_local *local = container_of(led_cdev->trigger,
  58                                                      struct ieee80211_local,
  59                                                      tx_led);
  60
  61         atomic_inc(&local->tx_led_active);
  62
  63         return 0;
  64 }
  65
  66 static void ieee80211_tx_led_deactivate(struct led_classdev *led_cdev)
  67 {
  68         struct ieee80211_local *local = container_of(led_cdev->trigger,
  69                                                      struct ieee80211_local,
  70                                                      tx_led);
  71
  72         atomic_dec(&local->tx_led_active);
  73 }
  74
  75 static int ieee80211_rx_led_activate(struct led_classdev *led_cdev)
  76 {
  77         struct ieee80211_local *local = container_of(led_cdev->trigger,
  78                                                      struct ieee80211_local,
  79                                                      rx_led);
  80
  81         atomic_inc(&local->rx_led_active);
  82
  83         return 0;
  84 }
  85
  86 static void ieee80211_rx_led_deactivate(struct led_classdev *led_cdev)
  87 {
  88         struct ieee80211_local *local = container_of(led_cdev->trigger,
  89                                                      struct ieee80211_local,
  90                                                      rx_led);
  91
  92         atomic_dec(&local->rx_led_active);
  93 }
  94
  95 static int ieee80211_assoc_led_activate(struct led_classdev *led_cdev)
  96 {
  97         struct ieee80211_local *local = container_of(led_cdev->trigger,
  98                                                      struct ieee80211_local,
  99                                                      assoc_led);
 100
 101         atomic_inc(&local->assoc_led_active);
 102
 103         return 0;
 104 }
 105
 106 static void ieee80211_assoc_led_deactivate(struct led_classdev *led_cdev)
 107 {
 108         struct ieee80211_local *local = container_of(led_cdev->trigger,
 109                                                      struct ieee80211_local,
 110                                                      assoc_led);
 111
 112         atomic_dec(&local->assoc_led_active);
 113 }
 114
 115 static int ieee80211_radio_led_activate(struct led_classdev *led_cdev)
 116 {
 117         struct ieee80211_local *local = container_of(led_cdev->trigger,
 118                                                      struct ieee80211_local,
 119                                                      radio_led);
 120
 121         atomic_inc(&local->radio_led_active);
 122
 123         return 0;
 124 }
 125
 126 static void ieee80211_radio_led_deactivate(struct led_classdev *led_cdev)
 127 {
 128         struct ieee80211_local *local = container_of(led_cdev->trigger,
 129                                                      struct ieee80211_local,
 130                                                      radio_led);
 131
 132         atomic_dec(&local->radio_led_active);
 133 }
 134
 135 static int ieee80211_tpt_led_activate(struct led_classdev *led_cdev)
 136 {
 137         struct ieee80211_local *local = container_of(led_cdev->trigger,
 138                                                      struct ieee80211_local,
 139                                                      tpt_led);
 140
 141         atomic_inc(&local->tpt_led_active);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_tpt_led_deactivate(struct led_classdev *led_cdev)
 147 {
 148         struct ieee80211_local *local = container_of(led_cdev->trigger,
 149                                                      struct ieee80211_local,
 150                                                      tpt_led);
 151
 152         atomic_dec(&local->tpt_led_active);
 153 }
 154
 155 void ieee80211_led_init(struct ieee80211_local *local)
 156 {
 157         atomic_set(&local->rx_led_active, 0);
 158         local->rx_led.activate = ieee80211_rx_led_activate;
 159         local->rx_led.deactivate = ieee80211_rx_led_deactivate;
 160         if (local->rx_led.name && led_trigger_register(&local->rx_led)) {
 161                 kfree(local->rx_led.name);
 162                 local->rx_led.name = NULL;
 163         }
 164
 165         atomic_set(&local->tx_led_active, 0);
 166         local->tx_led.activate = ieee80211_tx_led_activate;
 167         local->tx_led.deactivate = ieee80211_tx_led_deactivate;
 168         if (local->tx_led.name && led_trigger_register(&local->tx_led)) {
 169                 kfree(local->tx_led.name);
 170                 local->tx_led.name = NULL;
 171         }
 172
 173         atomic_set(&local->assoc_led_active, 0);
 174         local->assoc_led.activate = ieee80211_assoc_led_activate;
 175         local->assoc_led.deactivate = ieee80211_assoc_led_deactivate;
 176         if (local->assoc_led.name && led_trigger_register(&local->assoc_led)) {
 177                 kfree(local->assoc_led.name);
 178                 local->assoc_led.name = NULL;
 179         }
 180
 181         atomic_set(&local->radio_led_active, 0);
 182         local->radio_led.activate = ieee80211_radio_led_activate;
 183         local->radio_led.deactivate = ieee80211_radio_led_deactivate;
 184         if (local->radio_led.name && led_trigger_register(&local->radio_led)) {
 185                 kfree(local->radio_led.name);
 186                 local->radio_led.name = NULL;
 187         }
 188
 189         atomic_set(&local->tpt_led_active, 0);
 190         if (local->tpt_led_trigger) {
 191                 local->tpt_led.activate = ieee80211_tpt_led_activate;
 192                 local->tpt_led.deactivate = ieee80211_tpt_led_deactivate;
 193                 if (led_trigger_register(&local->tpt_led)) {
 194                         kfree(local->tpt_led_trigger);
 195                         local->tpt_led_trigger = NULL;
 196                 }
 197         }
 198 }
 199
 200 void ieee80211_led_exit(struct ieee80211_local *local)
 201 {
 202         if (local->radio_led.name)
 203                 led_trigger_unregister(&local->radio_led);
 204         if (local->assoc_led.name)
 205                 led_trigger_unregister(&local->assoc_led);
 206         if (local->tx_led.name)
 207                 led_trigger_unregister(&local->tx_led);
 208         if (local->rx_led.name)
 209                 led_trigger_unregister(&local->rx_led);
 210
 211         if (local->tpt_led_trigger) {
 212                 led_trigger_unregister(&local->tpt_led);
 213                 kfree(local->tpt_led_trigger);
 214         }
 215 }
 216
 217 const char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
 218 {
 219         struct ieee80211_local *local = hw_to_local(hw);
 220
 221         return local->radio_led.name;
 222 }
 223 EXPORT_SYMBOL(__ieee80211_get_radio_led_name);
 224
 225 const char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
 226 {
 227         struct ieee80211_local *local = hw_to_local(hw);
 228
 229         return local->assoc_led.name;
 230 }
 231 EXPORT_SYMBOL(__ieee80211_get_assoc_led_name);
 232
 233 const char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
 234 {
 235         struct ieee80211_local *local = hw_to_local(hw);
 236
 237         return local->tx_led.name;
 238 }
 239 EXPORT_SYMBOL(__ieee80211_get_tx_led_name);
 240
 241 const char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
 242 {
 243         struct ieee80211_local *local = hw_to_local(hw);
 244
 245         return local->rx_led.name;
 246 }
 247 EXPORT_SYMBOL(__ieee80211_get_rx_led_name);
 248
 249 static unsigned long tpt_trig_traffic(struct ieee80211_local *local,
 250                                       struct tpt_led_trigger *tpt_trig)
 251 {
 252         unsigned long traffic, delta;
 253
 254         traffic = tpt_trig->tx_bytes + tpt_trig->rx_bytes;
 255
 256         delta = traffic - tpt_trig->prev_traffic;
 257         tpt_trig->prev_traffic = traffic;
 258         return DIV_ROUND_UP(delta, 1024 / 8);
 259 }
 260
 261 static void tpt_trig_timer(struct timer_list *t)
 262 {
 263         struct tpt_led_trigger *tpt_trig = from_timer(tpt_trig, t, timer);
 264         struct ieee80211_local *local = tpt_trig->local;
 265         struct led_classdev *led_cdev;
 266         unsigned long on, off, tpt;
 267         int i;
 268
 269         if (!tpt_trig->running)
 270                 return;
 271
 272         mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
 273
 274         tpt = tpt_trig_traffic(local, tpt_trig);
 275
 276         /* default to just solid on */
 277         on = 1;
 278         off = 0;
 279
 280         for (i = tpt_trig->blink_table_len - 1; i >= 0; i--) {
 281                 if (tpt_trig->blink_table[i].throughput < 0 ||
 282                     tpt > tpt_trig->blink_table[i].throughput) {
 283                         off = tpt_trig->blink_table[i].blink_time / 2;
 284                         on = tpt_trig->blink_table[i].blink_time - off;
 285                         break;
 286                 }
 287         }
 288
 289         read_lock(&local->tpt_led.leddev_list_lock);
 290         list_for_each_entry(led_cdev, &local->tpt_led.led_cdevs, trig_list)
 291                 led_blink_set(led_cdev, &on, &off);
 292         read_unlock(&local->tpt_led.leddev_list_lock);
 293 }
 294
 295 const char *
 296 __ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
 297                                    unsigned int flags,
 298                                    const struct ieee80211_tpt_blink *blink_table,
 299                                    unsigned int blink_table_len)
 300 {
 301         struct ieee80211_local *local = hw_to_local(hw);
 302         struct tpt_led_trigger *tpt_trig;
 303
 304         if (WARN_ON(local->tpt_led_trigger))
 305                 return NULL;
 306
 307         tpt_trig = kzalloc(sizeof(struct tpt_led_trigger), GFP_KERNEL);
 308         if (!tpt_trig)
 309                 return NULL;
 310
 311         snprintf(tpt_trig->name, sizeof(tpt_trig->name),
 312                  "%stpt", wiphy_name(local->hw.wiphy));
 313
 314         local->tpt_led.name = tpt_trig->name;
 315
 316         tpt_trig->blink_table = blink_table;
 317         tpt_trig->blink_table_len = blink_table_len;
 318         tpt_trig->want = flags;
 319         tpt_trig->local = local;
 320
 321         timer_setup(&tpt_trig->timer, tpt_trig_timer, 0);
 322
 323         local->tpt_led_trigger = tpt_trig;
 324
 325         return tpt_trig->name;
 326 }
 327 EXPORT_SYMBOL(__ieee80211_create_tpt_led_trigger);
 328
 329 static void ieee80211_start_tpt_led_trig(struct ieee80211_local *local)
 330 {
 331         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 332
 333         if (tpt_trig->running)
 334                 return;
 335
 336         /* reset traffic */
 337         tpt_trig_traffic(local, tpt_trig);
 338         tpt_trig->running = true;
 339
 340         tpt_trig_timer(&tpt_trig->timer);
 341         mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
 342 }
 343
 344 static void ieee80211_stop_tpt_led_trig(struct ieee80211_local *local)
 345 {
 346         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 347         struct led_classdev *led_cdev;
 348
 349         if (!tpt_trig->running)
 350                 return;
 351
 352         tpt_trig->running = false;
 353         del_timer_sync(&tpt_trig->timer);
 354
 355         read_lock(&local->tpt_led.leddev_list_lock);
 356         list_for_each_entry(led_cdev, &local->tpt_led.led_cdevs, trig_list)
 357                 led_set_brightness(led_cdev, LED_OFF);
 358         read_unlock(&local->tpt_led.leddev_list_lock);
 359 }
 360
 361 void ieee80211_mod_tpt_led_trig(struct ieee80211_local *local,
 362                                 unsigned int types_on, unsigned int types_off)
 363 {
 364         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 365         bool allowed;
 366
 367         WARN_ON(types_on & types_off);
 368
 369         if (!tpt_trig)
 370                 return;
 371
 372         tpt_trig->active &= ~types_off;
 373         tpt_trig->active |= types_on;
 374
 375         /*
 376          * Regardless of wanted state, we shouldn't blink when
 377          * the radio is disabled -- this can happen due to some
 378          * code ordering issues with __ieee80211_recalc_idle()
 379          * being called before the radio is started.
 380          */
 381         allowed = tpt_trig->active & IEEE80211_TPT_LEDTRIG_FL_RADIO;
 382
 383         if (!allowed || !(tpt_trig->active & tpt_trig->want))
 384                 ieee80211_stop_tpt_led_trig(local);
 385         else
 386                 ieee80211_start_tpt_led_trig(local);
 387 }