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_rx(struct ieee80211_local *local)
  16 {
  17         if (unlikely(!local->rx_led))
  18                 return;
  19         if (local->rx_led_counter++ % 2 == 0)
  20                 led_trigger_event(local->rx_led, LED_OFF);
  21         else
  22                 led_trigger_event(local->rx_led, LED_FULL);
  23 }
  24
  25 /* q is 1 if a packet was enqueued, 0 if it has been transmitted */
  26 void ieee80211_led_tx(struct ieee80211_local *local, int q)
  27 {
  28         if (unlikely(!local->tx_led))
  29                 return;
  30         /* not sure how this is supposed to work ... */
  31         local->tx_led_counter += 2*q-1;
  32         if (local->tx_led_counter % 2 == 0)
  33                 led_trigger_event(local->tx_led, LED_OFF);
  34         else
  35                 led_trigger_event(local->tx_led, LED_FULL);
  36 }
  37
  38 void ieee80211_led_assoc(struct ieee80211_local *local, bool associated)
  39 {
  40         if (unlikely(!local->assoc_led))
  41                 return;
  42         if (associated)
  43                 led_trigger_event(local->assoc_led, LED_FULL);
  44         else
  45                 led_trigger_event(local->assoc_led, LED_OFF);
  46 }
  47
  48 void ieee80211_led_radio(struct ieee80211_local *local, bool enabled)
  49 {
  50         if (unlikely(!local->radio_led))
  51                 return;
  52         if (enabled)
  53                 led_trigger_event(local->radio_led, LED_FULL);
  54         else
  55                 led_trigger_event(local->radio_led, LED_OFF);
  56 }
  57
  58 void ieee80211_led_names(struct ieee80211_local *local)
  59 {
  60         snprintf(local->rx_led_name, sizeof(local->rx_led_name),
  61                  "%srx", wiphy_name(local->hw.wiphy));
  62         snprintf(local->tx_led_name, sizeof(local->tx_led_name),
  63                  "%stx", wiphy_name(local->hw.wiphy));
  64         snprintf(local->assoc_led_name, sizeof(local->assoc_led_name),
  65                  "%sassoc", wiphy_name(local->hw.wiphy));
  66         snprintf(local->radio_led_name, sizeof(local->radio_led_name),
  67                  "%sradio", wiphy_name(local->hw.wiphy));
  68 }
  69
  70 void ieee80211_led_init(struct ieee80211_local *local)
  71 {
  72         local->rx_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  73         if (local->rx_led) {
  74                 local->rx_led->name = local->rx_led_name;
  75                 if (led_trigger_register(local->rx_led)) {
  76                         kfree(local->rx_led);
  77                         local->rx_led = NULL;
  78                 }
  79         }
  80
  81         local->tx_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  82         if (local->tx_led) {
  83                 local->tx_led->name = local->tx_led_name;
  84                 if (led_trigger_register(local->tx_led)) {
  85                         kfree(local->tx_led);
  86                         local->tx_led = NULL;
  87                 }
  88         }
  89
  90         local->assoc_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
  91         if (local->assoc_led) {
  92                 local->assoc_led->name = local->assoc_led_name;
  93                 if (led_trigger_register(local->assoc_led)) {
  94                         kfree(local->assoc_led);
  95                         local->assoc_led = NULL;
  96                 }
  97         }
  98
  99         local->radio_led = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
 100         if (local->radio_led) {
 101                 local->radio_led->name = local->radio_led_name;
 102                 if (led_trigger_register(local->radio_led)) {
 103                         kfree(local->radio_led);
 104                         local->radio_led = NULL;
 105                 }
 106         }
 107
 108         if (local->tpt_led_trigger) {
 109                 if (led_trigger_register(&local->tpt_led_trigger->trig)) {
 110                         kfree(local->tpt_led_trigger);
 111                         local->tpt_led_trigger = NULL;
 112                 }
 113         }
 114 }
 115
 116 void ieee80211_led_exit(struct ieee80211_local *local)
 117 {
 118         if (local->radio_led) {
 119                 led_trigger_unregister(local->radio_led);
 120                 kfree(local->radio_led);
 121         }
 122         if (local->assoc_led) {
 123                 led_trigger_unregister(local->assoc_led);
 124                 kfree(local->assoc_led);
 125         }
 126         if (local->tx_led) {
 127                 led_trigger_unregister(local->tx_led);
 128                 kfree(local->tx_led);
 129         }
 130         if (local->rx_led) {
 131                 led_trigger_unregister(local->rx_led);
 132                 kfree(local->rx_led);
 133         }
 134
 135         if (local->tpt_led_trigger) {
 136                 led_trigger_unregister(&local->tpt_led_trigger->trig);
 137                 kfree(local->tpt_led_trigger);
 138         }
 139 }
 140
 141 char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
 142 {
 143         struct ieee80211_local *local = hw_to_local(hw);
 144
 145         return local->radio_led_name;
 146 }
 147 EXPORT_SYMBOL(__ieee80211_get_radio_led_name);
 148
 149 char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
 150 {
 151         struct ieee80211_local *local = hw_to_local(hw);
 152
 153         return local->assoc_led_name;
 154 }
 155 EXPORT_SYMBOL(__ieee80211_get_assoc_led_name);
 156
 157 char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
 158 {
 159         struct ieee80211_local *local = hw_to_local(hw);
 160
 161         return local->tx_led_name;
 162 }
 163 EXPORT_SYMBOL(__ieee80211_get_tx_led_name);
 164
 165 char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
 166 {
 167         struct ieee80211_local *local = hw_to_local(hw);
 168
 169         return local->rx_led_name;
 170 }
 171 EXPORT_SYMBOL(__ieee80211_get_rx_led_name);
 172
 173 static unsigned long tpt_trig_traffic(struct ieee80211_local *local,
 174                                       struct tpt_led_trigger *tpt_trig)
 175 {
 176         unsigned long traffic, delta;
 177
 178         traffic = tpt_trig->tx_bytes + tpt_trig->rx_bytes;
 179
 180         delta = traffic - tpt_trig->prev_traffic;
 181         tpt_trig->prev_traffic = traffic;
 182         return DIV_ROUND_UP(delta, 1024 / 8);
 183 }
 184
 185 static void tpt_trig_timer(unsigned long data)
 186 {
 187         struct ieee80211_local *local = (void *)data;
 188         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 189         struct led_classdev *led_cdev;
 190         unsigned long on, off, tpt;
 191         int i;
 192
 193         if (!tpt_trig->running)
 194                 return;
 195
 196         mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
 197
 198         tpt = tpt_trig_traffic(local, tpt_trig);
 199
 200         /* default to just solid on */
 201         on = 1;
 202         off = 0;
 203
 204         for (i = tpt_trig->blink_table_len - 1; i >= 0; i--) {
 205                 if (tpt_trig->blink_table[i].throughput < 0 ||
 206                     tpt > tpt_trig->blink_table[i].throughput) {
 207                         off = tpt_trig->blink_table[i].blink_time / 2;
 208                         on = tpt_trig->blink_table[i].blink_time - off;
 209                         break;
 210                 }
 211         }
 212
 213         read_lock(&tpt_trig->trig.leddev_list_lock);
 214         list_for_each_entry(led_cdev, &tpt_trig->trig.led_cdevs, trig_list)
 215                 led_blink_set(led_cdev, &on, &off);
 216         read_unlock(&tpt_trig->trig.leddev_list_lock);
 217 }
 218
 219 char *__ieee80211_create_tpt_led_trigger(struct ieee80211_hw *hw,
 220                                 unsigned int flags,
 221                                 const struct ieee80211_tpt_blink *blink_table,
 222                                 unsigned int blink_table_len)
 223 {
 224         struct ieee80211_local *local = hw_to_local(hw);
 225         struct tpt_led_trigger *tpt_trig;
 226
 227         if (WARN_ON(local->tpt_led_trigger))
 228                 return NULL;
 229
 230         tpt_trig = kzalloc(sizeof(struct tpt_led_trigger), GFP_KERNEL);
 231         if (!tpt_trig)
 232                 return NULL;
 233
 234         snprintf(tpt_trig->name, sizeof(tpt_trig->name),
 235                  "%stpt", wiphy_name(local->hw.wiphy));
 236
 237         tpt_trig->trig.name = tpt_trig->name;
 238
 239         tpt_trig->blink_table = blink_table;
 240         tpt_trig->blink_table_len = blink_table_len;
 241         tpt_trig->want = flags;
 242
 243         setup_timer(&tpt_trig->timer, tpt_trig_timer, (unsigned long)local);
 244
 245         local->tpt_led_trigger = tpt_trig;
 246
 247         return tpt_trig->name;
 248 }
 249 EXPORT_SYMBOL(__ieee80211_create_tpt_led_trigger);
 250
 251 static void ieee80211_start_tpt_led_trig(struct ieee80211_local *local)
 252 {
 253         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 254
 255         if (tpt_trig->running)
 256                 return;
 257
 258         /* reset traffic */
 259         tpt_trig_traffic(local, tpt_trig);
 260         tpt_trig->running = true;
 261
 262         tpt_trig_timer((unsigned long)local);
 263         mod_timer(&tpt_trig->timer, round_jiffies(jiffies + HZ));
 264 }
 265
 266 static void ieee80211_stop_tpt_led_trig(struct ieee80211_local *local)
 267 {
 268         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 269         struct led_classdev *led_cdev;
 270
 271         if (!tpt_trig->running)
 272                 return;
 273
 274         tpt_trig->running = false;
 275         del_timer_sync(&tpt_trig->timer);
 276
 277         read_lock(&tpt_trig->trig.leddev_list_lock);
 278         list_for_each_entry(led_cdev, &tpt_trig->trig.led_cdevs, trig_list)
 279                 led_set_brightness(led_cdev, LED_OFF);
 280         read_unlock(&tpt_trig->trig.leddev_list_lock);
 281 }
 282
 283 void ieee80211_mod_tpt_led_trig(struct ieee80211_local *local,
 284                                 unsigned int types_on, unsigned int types_off)
 285 {
 286         struct tpt_led_trigger *tpt_trig = local->tpt_led_trigger;
 287         bool allowed;
 288
 289         WARN_ON(types_on & types_off);
 290
 291         if (!tpt_trig)
 292                 return;
 293
 294         tpt_trig->active &= ~types_off;
 295         tpt_trig->active |= types_on;
 296
 297         /*
 298          * Regardless of wanted state, we shouldn't blink when
 299          * the radio is disabled -- this can happen due to some
 300          * code ordering issues with __ieee80211_recalc_idle()
 301          * being called before the radio is started.
 302          */
 303         allowed = tpt_trig->active & IEEE80211_TPT_LEDTRIG_FL_RADIO;
 304
 305         if (!allowed || !(tpt_trig->active & tpt_trig->want))
 306                 ieee80211_stop_tpt_led_trig(local);
 307         else
 308                 ieee80211_start_tpt_led_trig(local);
 309 }