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                         if (led_blink)
  80                                 ieee80211_queue_delayed_work(sc->hw,
  81                                                      &sc->ath_led_blink_work, 0);
  82                 } else if (led->led_type == ATH_LED_RADIO) {
  83                         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 0);
  84                         sc->sc_flags |= SC_OP_LED_ON;
  85                 } else {
  86                         sc->led_on_cnt++;
  87                 }
  88                 break;
  89         default:
  90                 break;
  91         }
  92 }
  93
  94 static int ath_register_led(struct ath_softc *sc, struct ath_led *led,
  95                             char *trigger)
  96 {
  97         int ret;
  98
  99         led->sc = sc;
 100         led->led_cdev.name = led->name;
 101         led->led_cdev.default_trigger = trigger;
 102         led->led_cdev.brightness_set = ath_led_brightness;
 103
 104         ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &led->led_cdev);
 105         if (ret)
 106                 ath_err(ath9k_hw_common(sc->sc_ah),
 107                         "Failed to register led:%s", led->name);
 108         else
 109                 led->registered = 1;
 110         return ret;
 111 }
 112
 113 static void ath_unregister_led(struct ath_led *led)
 114 {
 115         if (led->registered) {
 116                 led_classdev_unregister(&led->led_cdev);
 117                 led->registered = 0;
 118         }
 119 }
 120
 121 void ath_deinit_leds(struct ath_softc *sc)
 122 {
 123         ath_unregister_led(&sc->assoc_led);
 124         sc->sc_flags &= ~SC_OP_LED_ASSOCIATED;
 125         ath_unregister_led(&sc->tx_led);
 126         ath_unregister_led(&sc->rx_led);
 127         ath_unregister_led(&sc->radio_led);
 128         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
 129 }
 130
 131 void ath_init_leds(struct ath_softc *sc)
 132 {
 133         char *trigger;
 134         int ret;
 135
 136         if (AR_SREV_9287(sc->sc_ah))
 137                 sc->sc_ah->led_pin = ATH_LED_PIN_9287;
 138         else
 139                 sc->sc_ah->led_pin = ATH_LED_PIN_DEF;
 140
 141         /* Configure gpio 1 for output */
 142         ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin,
 143                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 144         /* LED off, active low */
 145         ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1);
 146
 147         if (led_blink)
 148                 INIT_DELAYED_WORK(&sc->ath_led_blink_work, ath_led_blink_work);
 149
 150         trigger = ieee80211_get_radio_led_name(sc->hw);
 151         snprintf(sc->radio_led.name, sizeof(sc->radio_led.name),
 152                 "ath9k-%s::radio", wiphy_name(sc->hw->wiphy));
 153         ret = ath_register_led(sc, &sc->radio_led, trigger);
 154         sc->radio_led.led_type = ATH_LED_RADIO;
 155         if (ret)
 156                 goto fail;
 157
 158         trigger = ieee80211_get_assoc_led_name(sc->hw);
 159         snprintf(sc->assoc_led.name, sizeof(sc->assoc_led.name),
 160                 "ath9k-%s::assoc", wiphy_name(sc->hw->wiphy));
 161         ret = ath_register_led(sc, &sc->assoc_led, trigger);
 162         sc->assoc_led.led_type = ATH_LED_ASSOC;
 163         if (ret)
 164                 goto fail;
 165
 166         trigger = ieee80211_get_tx_led_name(sc->hw);
 167         snprintf(sc->tx_led.name, sizeof(sc->tx_led.name),
 168                 "ath9k-%s::tx", wiphy_name(sc->hw->wiphy));
 169         ret = ath_register_led(sc, &sc->tx_led, trigger);
 170         sc->tx_led.led_type = ATH_LED_TX;
 171         if (ret)
 172                 goto fail;
 173
 174         trigger = ieee80211_get_rx_led_name(sc->hw);
 175         snprintf(sc->rx_led.name, sizeof(sc->rx_led.name),
 176                 "ath9k-%s::rx", wiphy_name(sc->hw->wiphy));
 177         ret = ath_register_led(sc, &sc->rx_led, trigger);
 178         sc->rx_led.led_type = ATH_LED_RX;
 179         if (ret)
 180                 goto fail;
 181
 182         return;
 183
 184 fail:
 185         if (led_blink)
 186                 cancel_delayed_work_sync(&sc->ath_led_blink_work);
 187         ath_deinit_leds(sc);
 188 }
 189
 190 /*******************/
 191 /*      Rfkill     */
 192 /*******************/
 193
 194 static bool ath_is_rfkill_set(struct ath_softc *sc)
 195 {
 196         struct ath_hw *ah = sc->sc_ah;
 197
 198         return ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
 199                                   ah->rfkill_polarity;
 200 }
 201
 202 void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
 203 {
 204         struct ath_softc *sc = hw->priv;
 205         bool blocked = !!ath_is_rfkill_set(sc);
 206
 207         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 208 }
 209
 210 void ath_start_rfkill_poll(struct ath_softc *sc)
 211 {
 212         struct ath_hw *ah = sc->sc_ah;
 213
 214         if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 215                 wiphy_rfkill_start_polling(sc->hw->wiphy);
 216 }
 217
 218 /******************/
 219 /*     BTCOEX     */
 220 /******************/
 221
 222 /*
 223  * Detects if there is any priority bt traffic
 224  */
 225 static void ath_detect_bt_priority(struct ath_softc *sc)
 226 {
 227         struct ath_btcoex *btcoex = &sc->btcoex;
 228         struct ath_hw *ah = sc->sc_ah;
 229
 230         if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
 231                 btcoex->bt_priority_cnt++;
 232
 233         if (time_after(jiffies, btcoex->bt_priority_time +
 234                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
 235                 sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 236                 /* Detect if colocated bt started scanning */
 237                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
 238                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 239                                 "BT scan detected\n");
 240                         sc->sc_flags |= (SC_OP_BT_SCAN |
 241                                          SC_OP_BT_PRIORITY_DETECTED);
 242                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
 243                         ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_BTCOEX,
 244                                 "BT priority traffic detected\n");
 245                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
 246                 }
 247
 248                 btcoex->bt_priority_cnt = 0;
 249                 btcoex->bt_priority_time = jiffies;
 250         }
 251 }
 252
 253 static void ath9k_gen_timer_start(struct ath_hw *ah,
 254                                   struct ath_gen_timer *timer,
 255                                   u32 timer_next,
 256                                   u32 timer_period)
 257 {
 258         ath9k_hw_gen_timer_start(ah, timer, timer_next, timer_period);
 259
 260         if ((ah->imask & ATH9K_INT_GENTIMER) == 0) {
 261                 ath9k_hw_disable_interrupts(ah);
 262                 ah->imask |= ATH9K_INT_GENTIMER;
 263                 ath9k_hw_set_interrupts(ah, ah->imask);
 264         }
 265 }
 266
 267 static void ath9k_gen_timer_stop(struct ath_hw *ah, struct ath_gen_timer *timer)
 268 {
 269         struct ath_gen_timer_table *timer_table = &ah->hw_gen_timers;
 270
 271         ath9k_hw_gen_timer_stop(ah, timer);
 272
 273         /* if no timer is enabled, turn off interrupt mask */
 274         if (timer_table->timer_mask.val == 0) {
 275                 ath9k_hw_disable_interrupts(ah);
 276                 ah->imask &= ~ATH9K_INT_GENTIMER;
 277                 ath9k_hw_set_interrupts(ah, ah->imask);
 278         }
 279 }
 280
 281 /*
 282  * This is the master bt coex timer which runs for every
 283  * 45ms, bt traffic will be given priority during 55% of this
 284  * period while wlan gets remaining 45%
 285  */
 286 static void ath_btcoex_period_timer(unsigned long data)
 287 {
 288         struct ath_softc *sc = (struct ath_softc *) data;
 289         struct ath_hw *ah = sc->sc_ah;
 290         struct ath_btcoex *btcoex = &sc->btcoex;
 291         struct ath_common *common = ath9k_hw_common(ah);
 292         u32 timer_period;
 293         bool is_btscan;
 294
 295         ath_detect_bt_priority(sc);
 296
 297         is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 298
 299         spin_lock_bh(&btcoex->btcoex_lock);
 300
 301         ath9k_cmn_btcoex_bt_stomp(common, is_btscan ? ATH_BTCOEX_STOMP_ALL :
 302                               btcoex->bt_stomp_type);
 303
 304         spin_unlock_bh(&btcoex->btcoex_lock);
 305
 306         if (btcoex->btcoex_period != btcoex->btcoex_no_stomp) {
 307                 if (btcoex->hw_timer_enabled)
 308                         ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 309
 310                 timer_period = is_btscan ? btcoex->btscan_no_stomp :
 311                                            btcoex->btcoex_no_stomp;
 312                 ath9k_gen_timer_start(ah, btcoex->no_stomp_timer, 0,
 313                                       timer_period * 10);
 314                 btcoex->hw_timer_enabled = true;
 315         }
 316
 317         mod_timer(&btcoex->period_timer, jiffies +
 318                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 319 }
 320
 321 /*
 322  * Generic tsf based hw timer which configures weight
 323  * registers to time slice between wlan and bt traffic
 324  */
 325 static void ath_btcoex_no_stomp_timer(void *arg)
 326 {
 327         struct ath_softc *sc = (struct ath_softc *)arg;
 328         struct ath_hw *ah = sc->sc_ah;
 329         struct ath_btcoex *btcoex = &sc->btcoex;
 330         struct ath_common *common = ath9k_hw_common(ah);
 331         bool is_btscan = sc->sc_flags & SC_OP_BT_SCAN;
 332
 333         ath_dbg(common, ATH_DBG_BTCOEX,
 334                 "no stomp timer running\n");
 335
 336         spin_lock_bh(&btcoex->btcoex_lock);
 337
 338         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW || is_btscan)
 339                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_NONE);
 340          else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 341                 ath9k_cmn_btcoex_bt_stomp(common, ATH_BTCOEX_STOMP_LOW);
 342
 343         spin_unlock_bh(&btcoex->btcoex_lock);
 344 }
 345
 346 int ath_init_btcoex_timer(struct ath_softc *sc)
 347 {
 348         struct ath_btcoex *btcoex = &sc->btcoex;
 349
 350         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 351         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 352                 btcoex->btcoex_period / 100;
 353         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 354                                    btcoex->btcoex_period / 100;
 355
 356         setup_timer(&btcoex->period_timer, ath_btcoex_period_timer,
 357                         (unsigned long) sc);
 358
 359         spin_lock_init(&btcoex->btcoex_lock);
 360
 361         btcoex->no_stomp_timer = ath_gen_timer_alloc(sc->sc_ah,
 362                         ath_btcoex_no_stomp_timer,
 363                         ath_btcoex_no_stomp_timer,
 364                         (void *) sc, AR_FIRST_NDP_TIMER);
 365
 366         if (!btcoex->no_stomp_timer)
 367                 return -ENOMEM;
 368
 369         return 0;
 370 }
 371
 372 /*
 373  * (Re)start btcoex timers
 374  */
 375 void ath9k_btcoex_timer_resume(struct ath_softc *sc)
 376 {
 377         struct ath_btcoex *btcoex = &sc->btcoex;
 378         struct ath_hw *ah = sc->sc_ah;
 379
 380         ath_dbg(ath9k_hw_common(ah), ATH_DBG_BTCOEX,
 381                 "Starting btcoex timers\n");
 382
 383         /* make sure duty cycle timer is also stopped when resuming */
 384         if (btcoex->hw_timer_enabled)
 385                 ath9k_gen_timer_stop(sc->sc_ah, btcoex->no_stomp_timer);
 386
 387         btcoex->bt_priority_cnt = 0;
 388         btcoex->bt_priority_time = jiffies;
 389         sc->sc_flags &= ~(SC_OP_BT_PRIORITY_DETECTED | SC_OP_BT_SCAN);
 390
 391         mod_timer(&btcoex->period_timer, jiffies);
 392 }
 393
 394
 395 /*
 396  * Pause btcoex timer and bt duty cycle timer
 397  */
 398 void ath9k_btcoex_timer_pause(struct ath_softc *sc)
 399 {
 400         struct ath_btcoex *btcoex = &sc->btcoex;
 401         struct ath_hw *ah = sc->sc_ah;
 402
 403         del_timer_sync(&btcoex->period_timer);
 404
 405         if (btcoex->hw_timer_enabled)
 406                 ath9k_gen_timer_stop(ah, btcoex->no_stomp_timer);
 407
 408         btcoex->hw_timer_enabled = false;
 409 }