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

   1 /*
   2  * Copyright (c) 2010-2011 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 "htc.h"
  18
  19 /******************/
  20 /*     BTCOEX     */
  21 /******************/
  22
  23 #define ATH_HTC_BTCOEX_PRODUCT_ID "wb193"
  24
  25 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
  26
  27 /*
  28  * Detects if there is any priority bt traffic
  29  */
  30 static void ath_detect_bt_priority(struct ath9k_htc_priv *priv)
  31 {
  32         struct ath_btcoex *btcoex = &priv->btcoex;
  33         struct ath_hw *ah = priv->ah;
  34
  35         if (ath9k_hw_gpio_get(ah, ah->btcoex_hw.btpriority_gpio))
  36                 btcoex->bt_priority_cnt++;
  37
  38         if (time_after(jiffies, btcoex->bt_priority_time +
  39                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
  40                 clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  41                 clear_bit(OP_BT_SCAN, &priv->op_flags);
  42                 /* Detect if colocated bt started scanning */
  43                 if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
  44                         ath_dbg(ath9k_hw_common(ah), BTCOEX,
  45                                 "BT scan detected\n");
  46                         set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  47                         set_bit(OP_BT_SCAN, &priv->op_flags);
  48                 } else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
  49                         ath_dbg(ath9k_hw_common(ah), BTCOEX,
  50                                 "BT priority traffic detected\n");
  51                         set_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
  52                 }
  53
  54                 btcoex->bt_priority_cnt = 0;
  55                 btcoex->bt_priority_time = jiffies;
  56         }
  57 }
  58
  59 /*
  60  * This is the master bt coex work which runs for every
  61  * 45ms, bt traffic will be given priority during 55% of this
  62  * period while wlan gets remaining 45%
  63  */
  64 static void ath_btcoex_period_work(struct work_struct *work)
  65 {
  66         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
  67                                                    coex_period_work.work);
  68         struct ath_btcoex *btcoex = &priv->btcoex;
  69         struct ath_common *common = ath9k_hw_common(priv->ah);
  70         u32 timer_period;
  71         int ret;
  72
  73         ath_detect_bt_priority(priv);
  74
  75         ret = ath9k_htc_update_cap_target(priv,
  76                           test_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags));
  77         if (ret) {
  78                 ath_err(common, "Unable to set BTCOEX parameters\n");
  79                 return;
  80         }
  81
  82         ath9k_hw_btcoex_bt_stomp(priv->ah, test_bit(OP_BT_SCAN, &priv->op_flags) ?
  83                                  ATH_BTCOEX_STOMP_ALL : btcoex->bt_stomp_type);
  84
  85         ath9k_hw_btcoex_enable(priv->ah);
  86         timer_period = test_bit(OP_BT_SCAN, &priv->op_flags) ?
  87                 btcoex->btscan_no_stomp : btcoex->btcoex_no_stomp;
  88         ieee80211_queue_delayed_work(priv->hw, &priv->duty_cycle_work,
  89                                      msecs_to_jiffies(timer_period));
  90         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work,
  91                                      msecs_to_jiffies(btcoex->btcoex_period));
  92 }
  93
  94 /*
  95  * Work to time slice between wlan and bt traffic and
  96  * configure weight registers
  97  */
  98 static void ath_btcoex_duty_cycle_work(struct work_struct *work)
  99 {
 100         struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
 101                                                    duty_cycle_work.work);
 102         struct ath_hw *ah = priv->ah;
 103         struct ath_btcoex *btcoex = &priv->btcoex;
 104         struct ath_common *common = ath9k_hw_common(ah);
 105
 106         ath_dbg(common, BTCOEX, "time slice work for bt and wlan\n");
 107
 108         if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
 109             test_bit(OP_BT_SCAN, &priv->op_flags))
 110                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 111         else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 112                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
 113
 114         ath9k_hw_btcoex_enable(priv->ah);
 115 }
 116
 117 static void ath_htc_init_btcoex_work(struct ath9k_htc_priv *priv)
 118 {
 119         struct ath_btcoex *btcoex = &priv->btcoex;
 120
 121         btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
 122         btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 123                 btcoex->btcoex_period / 100;
 124         btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
 125                                    btcoex->btcoex_period / 100;
 126         INIT_DELAYED_WORK(&priv->coex_period_work, ath_btcoex_period_work);
 127         INIT_DELAYED_WORK(&priv->duty_cycle_work, ath_btcoex_duty_cycle_work);
 128 }
 129
 130 /*
 131  * (Re)start btcoex work
 132  */
 133
 134 static void ath_htc_resume_btcoex_work(struct ath9k_htc_priv *priv)
 135 {
 136         struct ath_btcoex *btcoex = &priv->btcoex;
 137         struct ath_hw *ah = priv->ah;
 138
 139         ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex work\n");
 140
 141         btcoex->bt_priority_cnt = 0;
 142         btcoex->bt_priority_time = jiffies;
 143         clear_bit(OP_BT_PRIORITY_DETECTED, &priv->op_flags);
 144         clear_bit(OP_BT_SCAN, &priv->op_flags);
 145         ieee80211_queue_delayed_work(priv->hw, &priv->coex_period_work, 0);
 146 }
 147
 148
 149 /*
 150  * Cancel btcoex and bt duty cycle work.
 151  */
 152 static void ath_htc_cancel_btcoex_work(struct ath9k_htc_priv *priv)
 153 {
 154         cancel_delayed_work_sync(&priv->coex_period_work);
 155         cancel_delayed_work_sync(&priv->duty_cycle_work);
 156 }
 157
 158 void ath9k_htc_start_btcoex(struct ath9k_htc_priv *priv)
 159 {
 160         struct ath_hw *ah = priv->ah;
 161
 162         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_3WIRE) {
 163                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 164                                            AR_STOMP_LOW_WLAN_WGHT);
 165                 ath9k_hw_btcoex_enable(ah);
 166                 ath_htc_resume_btcoex_work(priv);
 167         }
 168 }
 169
 170 void ath9k_htc_stop_btcoex(struct ath9k_htc_priv *priv)
 171 {
 172         struct ath_hw *ah = priv->ah;
 173
 174         if (ah->btcoex_hw.enabled &&
 175             ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) {
 176                 ath9k_hw_btcoex_disable(ah);
 177                 if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
 178                         ath_htc_cancel_btcoex_work(priv);
 179         }
 180 }
 181
 182 void ath9k_htc_init_btcoex(struct ath9k_htc_priv *priv, char *product)
 183 {
 184         struct ath_hw *ah = priv->ah;
 185         int qnum;
 186
 187         if (product && strncmp(product, ATH_HTC_BTCOEX_PRODUCT_ID, 5) == 0) {
 188                 ah->btcoex_hw.scheme = ATH_BTCOEX_CFG_3WIRE;
 189         }
 190
 191         switch (ath9k_hw_get_btcoex_scheme(priv->ah)) {
 192         case ATH_BTCOEX_CFG_NONE:
 193                 break;
 194         case ATH_BTCOEX_CFG_3WIRE:
 195                 priv->ah->btcoex_hw.btactive_gpio = 7;
 196                 priv->ah->btcoex_hw.btpriority_gpio = 6;
 197                 priv->ah->btcoex_hw.wlanactive_gpio = 8;
 198                 priv->btcoex.bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 199                 ath9k_hw_btcoex_init_3wire(priv->ah);
 200                 ath_htc_init_btcoex_work(priv);
 201                 qnum = priv->hwq_map[WME_AC_BE];
 202                 ath9k_hw_init_btcoex_hw(priv->ah, qnum);
 203                 break;
 204         default:
 205                 WARN_ON(1);
 206                 break;
 207         }
 208 }
 209
 210 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */
 211
 212 /*******/
 213 /* LED */
 214 /*******/
 215
 216 #ifdef CONFIG_MAC80211_LEDS
 217 void ath9k_led_work(struct work_struct *work)
 218 {
 219         struct ath9k_htc_priv *priv = container_of(work,
 220                                                    struct ath9k_htc_priv,
 221                                                    led_work);
 222
 223         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin,
 224                           (priv->brightness == LED_OFF));
 225 }
 226
 227 static void ath9k_led_brightness(struct led_classdev *led_cdev,
 228                                  enum led_brightness brightness)
 229 {
 230         struct ath9k_htc_priv *priv = container_of(led_cdev,
 231                                                    struct ath9k_htc_priv,
 232                                                    led_cdev);
 233
 234         /* Not locked, but it's just a tiny green light..*/
 235         priv->brightness = brightness;
 236         ieee80211_queue_work(priv->hw, &priv->led_work);
 237 }
 238
 239 void ath9k_deinit_leds(struct ath9k_htc_priv *priv)
 240 {
 241         if (!priv->led_registered)
 242                 return;
 243
 244         ath9k_led_brightness(&priv->led_cdev, LED_OFF);
 245         led_classdev_unregister(&priv->led_cdev);
 246         cancel_work_sync(&priv->led_work);
 247 }
 248
 249 void ath9k_init_leds(struct ath9k_htc_priv *priv)
 250 {
 251         int ret;
 252
 253         if (AR_SREV_9287(priv->ah))
 254                 priv->ah->led_pin = ATH_LED_PIN_9287;
 255         else if (AR_SREV_9271(priv->ah))
 256                 priv->ah->led_pin = ATH_LED_PIN_9271;
 257         else if (AR_DEVID_7010(priv->ah))
 258                 priv->ah->led_pin = ATH_LED_PIN_7010;
 259         else
 260                 priv->ah->led_pin = ATH_LED_PIN_DEF;
 261
 262         /* Configure gpio 1 for output */
 263         ath9k_hw_cfg_output(priv->ah, priv->ah->led_pin,
 264                             AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 265         /* LED off, active low */
 266         ath9k_hw_set_gpio(priv->ah, priv->ah->led_pin, 1);
 267
 268         snprintf(priv->led_name, sizeof(priv->led_name),
 269                 "ath9k_htc-%s", wiphy_name(priv->hw->wiphy));
 270         priv->led_cdev.name = priv->led_name;
 271         priv->led_cdev.brightness_set = ath9k_led_brightness;
 272
 273         ret = led_classdev_register(wiphy_dev(priv->hw->wiphy), &priv->led_cdev);
 274         if (ret < 0)
 275                 return;
 276
 277         INIT_WORK(&priv->led_work, ath9k_led_work);
 278         priv->led_registered = true;
 279
 280         return;
 281 }
 282 #endif
 283
 284 /*******************/
 285 /*      Rfkill     */
 286 /*******************/
 287
 288 static bool ath_is_rfkill_set(struct ath9k_htc_priv *priv)
 289 {
 290         bool is_blocked;
 291
 292         ath9k_htc_ps_wakeup(priv);
 293         is_blocked = ath9k_hw_gpio_get(priv->ah, priv->ah->rfkill_gpio) ==
 294                                                  priv->ah->rfkill_polarity;
 295         ath9k_htc_ps_restore(priv);
 296
 297         return is_blocked;
 298 }
 299
 300 void ath9k_htc_rfkill_poll_state(struct ieee80211_hw *hw)
 301 {
 302         struct ath9k_htc_priv *priv = hw->priv;
 303         bool blocked = !!ath_is_rfkill_set(priv);
 304
 305         wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
 306 }
 307
 308 void ath9k_start_rfkill_poll(struct ath9k_htc_priv *priv)
 309 {
 310         if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
 311                 wiphy_rfkill_start_polling(priv->hw->wiphy);
 312 }