drivers/net/wireless/ath/ath9k/gpio.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "ath9k.h"
  18
  19 /********************************/
  20 /*       LED functions          */
  21 /********************************/
  22
  23 static void ath_led_blink_work(struct work_struct *work)
  24 {
  25         struct ath_softc *sc = container_of(work, struct ath_softc,
  26                                             ath_led_blink_work.work);
  27
  28         if (!(sc->sc_flags & SC_OP_LED_ASSOCIATED))
  29                 return;
  30
  31         if ((sc->led_on_duration == ATH_LED_ON_DURATION_IDLE) ||
  32             (sc->led_off_duration == ATH_LED_OFF_DURATION_IDLE))
  33                 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 0);
  34         else
  35                 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin,
  36                                   (sc->sc_flags & SC_OP_LED_ON) ? 1 : 0);
  37
  38         ieee80211_queue_delayed_work(sc->hw,
  39                                      &sc->ath_led_blink_work,
  40                                      (sc->sc_flags & SC_OP_LED_ON) ?
  41                                         msecs_to_jiffies(sc->led_off_duration) :
  42                                         msecs_to_jiffies(sc->led_on_duration));
  43
  44         sc->led_on_duration = sc->led_on_cnt ?
  45                         max((ATH_LED_ON_DURATION_IDLE - sc->led_on_cnt), 25) :
  46                         ATH_LED_ON_DURATION_IDLE;
  47         sc->led_off_duration = sc->led_off_cnt ?
  48                         max((ATH_LED_OFF_DURATION_IDLE - sc->led_off_cnt), 10) :
  49                         ATH_LED_OFF_DURATION_IDLE;
  50         sc->led_on_cnt = sc->led_off_cnt = 0;
  51         if (sc->sc_flags & SC_OP_LED_ON)
  52                 sc->sc_flags &= ~SC_OP_LED_ON;
  53         else
  54                 sc->sc_flags |= SC_OP_LED_ON;
  55 }
  56
  57 static void ath_led_brightness(struct led_classdev *led_cdev,
  58                                enum led_brightness brightness)
  59 {
  60         struct ath_led *led = container_of(led_cdev, struct ath_led, led_cdev);
  61         struct ath_softc *sc = led->sc;
  62
  63         switch (brightness) {
  64         case LED_OFF:
  65                 if (led->led_type == ATH_LED_ASSOC ||
  66                     led->led_type == ATH_LED_RADIO) {
  67                         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin,
  68                                 (led->led_type == ATH_LED_RADIO));
  69                         sc->sc_flags &= ~SC_OP_LED_ASSOCIATED;
  70                         if (led->led_type == ATH_LED_RADIO)
  71                                 sc->sc_flags &= ~SC_OP_LED_ON;
  72                 } else {
  73                         sc->led_off_cnt++;
  74                 }
  75                 break;
  76         case LED_FULL:
  77                 if (led->led_type == ATH_LED_ASSOC) {
  78                         sc->sc_flags |= SC_OP_LED_ASSOCIATED;
  79                         ieee80211_queue_delayed_work(sc->hw,
  80                                                      &sc->ath_led_blink_work, 0);
  81                 } else if (led->led_type == ATH_LED_RADIO) {
  82                         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 0);
  83                         sc->sc_flags |= SC_OP_LED_ON;
  84                 } else {
  85                         sc->led_on_cnt++;
  86                 }
  87                 break;
  88         default:
  89                 break;
  90         }
  91 }
  92
  93 static int ath_register_led(struct ath_softc *sc, struct ath_led *led,
  94                             char *trigger)
  95 {
  96         int ret;
  97
  98         led->sc = sc;
  99         led->led_cdev.name = led->name;
 100         led->led_cdev.default_trigger = trigger;
 101         led->led_cdev.brightness_set = ath_led_brightness;
 102
 103         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &led->led_cdev);
 104         if (ret)
 105                 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
 106                           "Failed to register led:%s", led->name);
 107         else
 108                 led->registered = 1;
 109         return ret;
 110 }
 111
 112 static void ath_unregister_led(struct ath_led *led)
 113 {
 114         if (led->registered) {
 115                 led_classdev_unregister(&led->led_cdev);
 116                 led->registered = 0;
 117         }
 118 }
 119
 120 void ath_deinit_leds(struct ath_softc *sc)
 121 {
 122         ath_unregister_led(&sc->assoc_led);
 123         sc->sc_flags &= ~SC_OP_LED_ASSOCIATED;
 124         ath_unregister_led(&sc->tx_led);
 125         ath_unregister_led(&sc->rx_led);
 126         ath_unregister_led(&sc->radio_led);
 127         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
 128 }
 129
 130 void ath_init_leds(struct ath_softc *sc)
 131 {
 132         char *trigger;
 133         int ret;
 134
 135         if (AR_SREV_9287(sc->sc_ah))
 136                 sc->sc_ah->led_pin = ATH_LED_PIN_9287;
 137         else
 138                 sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
 139
 140         /* Configure gpio 1 for output */
 141         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
 142                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 143         /* LED off, active low */
 144         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
 145
 146         INIT_DELAYED_WORK(&sc->ath_led_blink_work, ath_led_blink_work);
 147
 148         trigger = ieee80211_get_radio_led_name(sc->hw);
 149         snprintf(sc->radio_led.name, sizeof(sc->radio_led.name),
 150                 "ath9k-%s::radio", wiphy_name(sc->hw->wiphy));
 151         ret = ath_register_led(sc, &sc->radio_led, trigger);
 152         sc->radio_led.led_type = ATH_LED_RADIO;
 153         if (ret)
 154                 goto fail;
 155
 156         trigger = ieee80211_get_assoc_led_name(sc->hw);
 157         snprintf(sc->assoc_led.name, sizeof(sc->assoc_led.name),
 158                 "ath9k-%s::assoc", wiphy_name(sc->hw->wiphy));
 159         ret = ath_register_led(sc, &sc->assoc_led, trigger);
 160         sc->assoc_led.led_type = ATH_LED_ASSOC;
 161         if (ret)
 162                 goto fail;
 163
 164         trigger = ieee80211_get_tx_led_name(sc->hw);
 165         snprintf(sc->tx_led.name, sizeof(sc->tx_led.name),
 166                 "ath9k-%s::tx", wiphy_name(sc->hw->wiphy));
 167         ret = ath_register_led(sc, &sc->tx_led, trigger);
 168         sc->tx_led.led_type = ATH_LED_TX;
 169         if (ret)
 170                 goto fail;
 171
 172         trigger = ieee80211_get_rx_led_name(sc->hw);
 173         snprintf(sc->rx_led.name, sizeof(sc->rx_led.name),
 174                 "ath9k-%s::rx", wiphy_name(sc->hw->wiphy));
 175         ret = ath_register_led(sc, &sc->rx_led, trigger);
 176         sc->rx_led.led_type = ATH_LED_RX;
 177         if (ret)
 178                 goto fail;
 179
 180         return;
 181
 182 fail:
 183         cancel_delayed_work_sync(&sc->ath_led_blink_work);
 184         ath_deinit_leds(sc);
 185 }
 186
 187 /*******************/
 188 /*      Rfkill     */
 189 /*******************/
 190
 191 static bool ath_is_rfkill_set(struct ath_softc *sc)
 192 {
 193         struct ath_hw *ah = sc->sc_ah;
 194
 195         return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 196                                   ah->rfkill_polarity;
 197 }
 198
 199 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 200 {
 201         struct ath_wiphy *aphy = hw->priv;
 202         struct ath_softc *sc = aphy->sc;
 203         bool blocked = !!ath_is_rfkill_set(sc);
 204
 205         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 206 }
 207
 208 void ath_start_rfkill_poll(struct ath_softc *sc)
 209 {
 210         struct ath_hw *ah = sc->sc_ah;
 211
 212         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 213                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 214 }
 215
 216 /******************/
 217 /*     BTCOEX     */
 218 /******************/
 219
 220 /*
 221  * Detects if there is any priority bt traffic
 222  */
 223 static void ath_detect_bt_priority(struct ath_softc *sc)
 224 {
 225         struct ath_btcoex *btcoex = &sc->btcoex;
 226         struct ath_hw *ah = sc->sc_ah;
 227
 228         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 229                 btcoex->bt_priority_cnt++;
 230
 231         if (time_after(jiffies, btcoex->bt_priority_time +
 232                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 233                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 234                 /* Detect if colocated bt started scanning */
 235                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 236                         ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 237                                   "BT scan detected");
 238                         sc->sc_flags |= (SC_OP_BT_SCAN |
 239                                          SC_OP_BT_PRIORITY_DETECTED);
 240                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 241                         ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 242                                   "BT priority traffic detected");
 243                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 244                 }
 245
 246                 btcoex->bt_priority_cnt = 0;
 247                 btcoex->bt_priority_time = jiffies;
 248         }
 249 }
 250
 251 /*
 252  * Configures appropriate weight based on stomp type.
 253  */
 254 static void ath9k_btcoex_bt_stomp(struct ath_softc *sc,
 255                                   enum ath_stomp_type stomp_type)
 256 {
 257         struct ath_hw *ah = sc->sc_ah;
 258
 259         switch (stomp_type) {
 260         case ATH_BTCOEX_STOMP_ALL:
 261                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 262                                            AR_STOMP_ALL_WLAN_WGHT);
 263                 break;
 264         case ATH_BTCOEX_STOMP_LOW:
 265                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 266                                            AR_STOMP_LOW_WLAN_WGHT);
 267                 break;
 268         case ATH_BTCOEX_STOMP_NONE:
 269                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 270                                            AR_STOMP_NONE_WLAN_WGHT);
 271                 break;
 272         default:
 273                 ath_print(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 274                           "Invalid Stomptype\n");
 275                 break;
 276         }
 277
 278         ath9k_hw_btcoex_enable(ah);
 279 }
 280
 281 static void ath9k_gen_timer_start(struct ath_hw *ah,
 282                                   struct ath_gen_timer *timer,
 283                                   u32 timer_next,
 284                                   u32 timer_period)
 285 {
 286         ath9k_hw_gen_timer_start(ah, timer, timer_next, timer_period);
 287
 288         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 289                 ath9k_hw_set_interrupts(ah, 0);
 290                 ah->imask |= ATH9K_INT_GENTIMER;
 291                 ath9k_hw_set_interrupts(ah, ah->imask);
 292         }
 293 }
 294
 295 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 296 {
 297         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 298
 299         ath9k_hw_gen_timer_stop(ah, timer);
 300
 301         /* if no timer is enabled, turn off interrupt mask */
 302         if (timer_table->timer_mask.val == 0) {
 303                 ath9k_hw_set_interrupts(ah, 0);
 304                 ah->imask &= ~ATH9K_INT_GENTIMER;
 305                 ath9k_hw_set_interrupts(ah, ah->imask);
 306         }
 307 }
 308
 309 /*
 310  * This is the master bt coex timer which runs for every
 311  * 45ms, bt traffic will be given priority during 55% of this
 312  * period while wlan gets remaining 45%
 313  */
 314 static void ath_btcoex_period_timer(unsigned long data)
 315 {
 316         struct ath_softc *sc = (struct ath_softc *) data;
 317         struct ath_hw *ah = sc->sc_ah;
 318         struct ath_btcoex *btcoex = &sc->btcoex;
 319         u32 timer_period;
 320         bool is_btscan;
 321
 322         ath_detect_bt_priority(sc);
 323
 324         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 325
 326         spin_lock_bh(&btcoex->btcoex_lock);
 327
 328         ath9k_btcoex_bt_stomp(sc, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 329                               btcoex->bt_stomp_type);
 330
 331         spin_unlock_bh(&btcoex->btcoex_lock);
 332
 333         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 334                 if (btcoex->hw_timer_enabled)
 335                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 336
 337                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 338                                            btcoex->btcoex_no_stomp;
 339                 ath9k_gen_timer_start(ah,
 340                                       btcoex->no_stomp_timer,
 341                                       (ath9k_hw_gettsf32(ah) +
 342                                        timer_period), timer_period * 10);
 343                 btcoex->hw_timer_enabled = true;
 344         }
 345
 346         mod_timer(&btcoex->period_timer, jiffies +
 347                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 348 }
 349
 350 /*
 351  * Generic tsf based hw timer which configures weight
 352  * registers to time slice between wlan and bt traffic
 353  */
 354 static void ath_btcoex_no_stomp_timer(void *arg)
 355 {
 356         struct ath_softc *sc = (struct ath_softc *)arg;
 357         struct ath_hw *ah = sc->sc_ah;
 358         struct ath_btcoex *btcoex = &sc->btcoex;
 359         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 360
 361         ath_print(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 362                   "no stomp timer running\n");
 363
 364         spin_lock_bh(&btcoex->btcoex_lock);
 365
 366         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 367                 ath9k_btcoex_bt_stomp(sc, ATH_BTCOEX_STOMP_NONE);
 368          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 369                 ath9k_btcoex_bt_stomp(sc, ATH_BTCOEX_STOMP_LOW);
 370
 371         spin_unlock_bh(&btcoex->btcoex_lock);
 372 }
 373
 374 int ath_init_btcoex_timer(struct ath_softc *sc)
 375 {
 376         struct ath_btcoex *btcoex = &sc->btcoex;
 377
 378         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 379         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 380                 btcoex->btcoex_period / 100;
 381         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 382                                    btcoex->btcoex_period / 100;
 383
 384         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 385                         (unsigned long) sc);
 386
 387         spin_lock_init(&btcoex->btcoex_lock);
 388
 389         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 390                         ath_btcoex_no_stomp_timer,
 391                         ath_btcoex_no_stomp_timer,
 392                         (void *) sc, AR_FIRST_NDP_TIMER);
 393
 394         if (!btcoex->no_stomp_timer)
 395                 return -ENOMEM;
 396
 397         return 0;
 398 }
 399
 400 /*
 401  * (Re)start btcoex timers
 402  */
 403 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 404 {
 405         struct ath_btcoex *btcoex = &sc->btcoex;
 406         struct ath_hw *ah = sc->sc_ah;
 407
 408         ath_print(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 409                   "Starting btcoex timers");
 410
 411         /* make sure duty cycle timer is also stopped when resuming */
 412         if (btcoex->hw_timer_enabled)
 413                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 414
 415         btcoex->bt_priority_cnt = 0;
 416         btcoex->bt_priority_time = jiffies;
 417         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 418
 419         mod_timer(&btcoex->period_timer, jiffies);
 420 }
 421
 422
 423 /*
 424  * Pause btcoex timer and bt duty cycle timer
 425  */
 426 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 427 {
 428         struct ath_btcoex *btcoex = &sc->btcoex;
 429         struct ath_hw *ah = sc->sc_ah;
 430
 431         del_timer_sync(&btcoex->period_timer);
 432
 433         if (btcoex->hw_timer_enabled)
 434                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 435
 436         btcoex->hw_timer_enabled = false;
 437 }