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

   1 /*
   2  * Copyright (c) 2013 Qualcomm Atheros, 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 static const struct wiphy_wowlan_support ath9k_wowlan_support = {
  20         .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT,
  21         .n_patterns = MAX_NUM_USER_PATTERN,
  22         .pattern_min_len = 1,
  23         .pattern_max_len = MAX_PATTERN_SIZE,
  24 };
  25
  26 static void ath9k_wow_map_triggers(struct ath_softc *sc,
  27                                    struct cfg80211_wowlan *wowlan,
  28                                    u32 *wow_triggers)
  29 {
  30         if (wowlan->disconnect)
  31                 *wow_triggers |= AH_WOW_LINK_CHANGE |
  32                                  AH_WOW_BEACON_MISS;
  33         if (wowlan->magic_pkt)
  34                 *wow_triggers |= AH_WOW_MAGIC_PATTERN_EN;
  35
  36         if (wowlan->n_patterns)
  37                 *wow_triggers |= AH_WOW_USER_PATTERN_EN;
  38
  39         sc->wow_enabled = *wow_triggers;
  40
  41 }
  42
  43 static void ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)
  44 {
  45         struct ath_hw *ah = sc->sc_ah;
  46         struct ath_common *common = ath9k_hw_common(ah);
  47         int pattern_count = 0;
  48         int i, byte_cnt;
  49         u8 dis_deauth_pattern[MAX_PATTERN_SIZE];
  50         u8 dis_deauth_mask[MAX_PATTERN_SIZE];
  51
  52         memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE);
  53         memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE);
  54
  55         /*
  56          * Create Dissassociate / Deauthenticate packet filter
  57          *
  58          *     2 bytes        2 byte    6 bytes   6 bytes  6 bytes
  59          *  +--------------+----------+---------+--------+--------+----
  60          *  + Frame Control+ Duration +   DA    +  SA    +  BSSID +
  61          *  +--------------+----------+---------+--------+--------+----
  62          *
  63          * The above is the management frame format for disassociate/
  64          * deauthenticate pattern, from this we need to match the first byte
  65          * of 'Frame Control' and DA, SA, and BSSID fields
  66          * (skipping 2nd byte of FC and Duration feild.
  67          *
  68          * Disassociate pattern
  69          * --------------------
  70          * Frame control = 00 00 1010
  71          * DA, SA, BSSID = x:x:x:x:x:x
  72          * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x
  73          *                          | x:x:x:x:x:x  -- 22 bytes
  74          *
  75          * Deauthenticate pattern
  76          * ----------------------
  77          * Frame control = 00 00 1100
  78          * DA, SA, BSSID = x:x:x:x:x:x
  79          * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x
  80          *                          | x:x:x:x:x:x  -- 22 bytes
  81          */
  82
  83         /* Create Disassociate Pattern first */
  84
  85         byte_cnt = 0;
  86
  87         /* Fill out the mask with all FF's */
  88
  89         for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++)
  90                 dis_deauth_mask[i] = 0xff;
  91
  92         /* copy the first byte of frame control field */
  93         dis_deauth_pattern[byte_cnt] = 0xa0;
  94         byte_cnt++;
  95
  96         /* skip 2nd byte of frame control and Duration field */
  97         byte_cnt += 3;
  98
  99         /*
 100          * need not match the destination mac address, it can be a broadcast
 101          * mac address or an unicast to this station
 102          */
 103         byte_cnt += 6;
 104
 105         /* copy the source mac address */
 106         memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);
 107
 108         byte_cnt += 6;
 109
 110         /* copy the bssid, its same as the source mac address */
 111
 112         memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);
 113
 114         /* Create Disassociate pattern mask */
 115
 116         dis_deauth_mask[0] = 0xfe;
 117         dis_deauth_mask[1] = 0x03;
 118         dis_deauth_mask[2] = 0xc0;
 119
 120         ath_dbg(common, WOW, "Adding disassoc/deauth patterns for WoW\n");
 121
 122         ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
 123                                    pattern_count, byte_cnt);
 124
 125         pattern_count++;
 126         /*
 127          * for de-authenticate pattern, only the first byte of the frame
 128          * control field gets changed from 0xA0 to 0xC0
 129          */
 130         dis_deauth_pattern[0] = 0xC0;
 131
 132         ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
 133                                    pattern_count, byte_cnt);
 134
 135 }
 136
 137 static void ath9k_wow_add_pattern(struct ath_softc *sc,
 138                                   struct cfg80211_wowlan *wowlan)
 139 {
 140         struct ath_hw *ah = sc->sc_ah;
 141         struct ath9k_wow_pattern *wow_pattern = NULL;
 142         struct cfg80211_pkt_pattern *patterns = wowlan->patterns;
 143         int mask_len;
 144         s8 i = 0;
 145
 146         if (!wowlan->n_patterns)
 147                 return;
 148
 149         /*
 150          * Add the new user configured patterns
 151          */
 152         for (i = 0; i < wowlan->n_patterns; i++) {
 153
 154                 wow_pattern = kzalloc(sizeof(*wow_pattern), GFP_KERNEL);
 155
 156                 if (!wow_pattern)
 157                         return;
 158
 159                 /*
 160                  * TODO: convert the generic user space pattern to
 161                  * appropriate chip specific/802.11 pattern.
 162                  */
 163
 164                 mask_len = DIV_ROUND_UP(wowlan->patterns[i].pattern_len, 8);
 165                 memset(wow_pattern->pattern_bytes, 0, MAX_PATTERN_SIZE);
 166                 memset(wow_pattern->mask_bytes, 0, MAX_PATTERN_SIZE);
 167                 memcpy(wow_pattern->pattern_bytes, patterns[i].pattern,
 168                        patterns[i].pattern_len);
 169                 memcpy(wow_pattern->mask_bytes, patterns[i].mask, mask_len);
 170                 wow_pattern->pattern_len = patterns[i].pattern_len;
 171
 172                 /*
 173                  * just need to take care of deauth and disssoc pattern,
 174                  * make sure we don't overwrite them.
 175                  */
 176
 177                 ath9k_hw_wow_apply_pattern(ah, wow_pattern->pattern_bytes,
 178                                            wow_pattern->mask_bytes,
 179                                            i + 2,
 180                                            wow_pattern->pattern_len);
 181                 kfree(wow_pattern);
 182
 183         }
 184
 185 }
 186
 187 int ath9k_suspend(struct ieee80211_hw *hw,
 188                   struct cfg80211_wowlan *wowlan)
 189 {
 190         struct ath_softc *sc = hw->priv;
 191         struct ath_hw *ah = sc->sc_ah;
 192         struct ath_common *common = ath9k_hw_common(ah);
 193         u32 wow_triggers_enabled = 0;
 194         int ret = 0;
 195
 196         mutex_lock(&sc->mutex);
 197
 198         ath_cancel_work(sc);
 199         ath_stop_ani(sc);
 200
 201         if (test_bit(SC_OP_INVALID, &sc->sc_flags)) {
 202                 ath_dbg(common, ANY, "Device not present\n");
 203                 ret = -EINVAL;
 204                 goto fail_wow;
 205         }
 206
 207         if (WARN_ON(!wowlan)) {
 208                 ath_dbg(common, WOW, "None of the WoW triggers enabled\n");
 209                 ret = -EINVAL;
 210                 goto fail_wow;
 211         }
 212
 213         if (!device_can_wakeup(sc->dev)) {
 214                 ath_dbg(common, WOW, "device_can_wakeup failed, WoW is not enabled\n");
 215                 ret = 1;
 216                 goto fail_wow;
 217         }
 218
 219         /*
 220          * none of the sta vifs are associated
 221          * and we are not currently handling multivif
 222          * cases, for instance we have to seperately
 223          * configure 'keep alive frame' for each
 224          * STA.
 225          */
 226
 227         if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) {
 228                 ath_dbg(common, WOW, "None of the STA vifs are associated\n");
 229                 ret = 1;
 230                 goto fail_wow;
 231         }
 232
 233         if (sc->nvifs > 1) {
 234                 ath_dbg(common, WOW, "WoW for multivif is not yet supported\n");
 235                 ret = 1;
 236                 goto fail_wow;
 237         }
 238
 239         ath9k_wow_map_triggers(sc, wowlan, &wow_triggers_enabled);
 240
 241         ath_dbg(common, WOW, "WoW triggers enabled 0x%x\n",
 242                 wow_triggers_enabled);
 243
 244         ath9k_ps_wakeup(sc);
 245
 246         ath9k_stop_btcoex(sc);
 247
 248         /*
 249          * Enable wake up on recieving disassoc/deauth
 250          * frame by default.
 251          */
 252         ath9k_wow_add_disassoc_deauth_pattern(sc);
 253
 254         if (wow_triggers_enabled & AH_WOW_USER_PATTERN_EN)
 255                 ath9k_wow_add_pattern(sc, wowlan);
 256
 257         spin_lock_bh(&sc->sc_pcu_lock);
 258         /*
 259          * To avoid false wake, we enable beacon miss interrupt only
 260          * when we go to sleep. We save the current interrupt mask
 261          * so we can restore it after the system wakes up
 262          */
 263         sc->wow_intr_before_sleep = ah->imask;
 264         ah->imask &= ~ATH9K_INT_GLOBAL;
 265         ath9k_hw_disable_interrupts(ah);
 266         ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL;
 267         ath9k_hw_set_interrupts(ah);
 268         ath9k_hw_enable_interrupts(ah);
 269
 270         spin_unlock_bh(&sc->sc_pcu_lock);
 271
 272         /*
 273          * we can now sync irq and kill any running tasklets, since we already
 274          * disabled interrupts and not holding a spin lock
 275          */
 276         synchronize_irq(sc->irq);
 277         tasklet_kill(&sc->intr_tq);
 278
 279         ath9k_hw_wow_enable(ah, wow_triggers_enabled);
 280
 281         ath9k_ps_restore(sc);
 282         ath_dbg(common, ANY, "WoW enabled in ath9k\n");
 283         atomic_inc(&sc->wow_sleep_proc_intr);
 284
 285 fail_wow:
 286         mutex_unlock(&sc->mutex);
 287         return ret;
 288 }
 289
 290 int ath9k_resume(struct ieee80211_hw *hw)
 291 {
 292         struct ath_softc *sc = hw->priv;
 293         struct ath_hw *ah = sc->sc_ah;
 294         struct ath_common *common = ath9k_hw_common(ah);
 295         u32 wow_status;
 296
 297         mutex_lock(&sc->mutex);
 298
 299         ath9k_ps_wakeup(sc);
 300
 301         spin_lock_bh(&sc->sc_pcu_lock);
 302
 303         ath9k_hw_disable_interrupts(ah);
 304         ah->imask = sc->wow_intr_before_sleep;
 305         ath9k_hw_set_interrupts(ah);
 306         ath9k_hw_enable_interrupts(ah);
 307
 308         spin_unlock_bh(&sc->sc_pcu_lock);
 309
 310         wow_status = ath9k_hw_wow_wakeup(ah);
 311
 312         if (atomic_read(&sc->wow_got_bmiss_intr) == 0) {
 313                 /*
 314                  * some devices may not pick beacon miss
 315                  * as the reason they woke up so we add
 316                  * that here for that shortcoming.
 317                  */
 318                 wow_status |= AH_WOW_BEACON_MISS;
 319                 atomic_dec(&sc->wow_got_bmiss_intr);
 320                 ath_dbg(common, ANY, "Beacon miss interrupt picked up during WoW sleep\n");
 321         }
 322
 323         atomic_dec(&sc->wow_sleep_proc_intr);
 324
 325         if (wow_status) {
 326                 ath_dbg(common, ANY, "Waking up due to WoW triggers %s with WoW status = %x\n",
 327                         ath9k_hw_wow_event_to_string(wow_status), wow_status);
 328         }
 329
 330         ath_restart_work(sc);
 331         ath9k_start_btcoex(sc);
 332
 333         ath9k_ps_restore(sc);
 334         mutex_unlock(&sc->mutex);
 335
 336         return 0;
 337 }
 338
 339 void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled)
 340 {
 341         struct ath_softc *sc = hw->priv;
 342
 343         mutex_lock(&sc->mutex);
 344         device_init_wakeup(sc->dev, 1);
 345         device_set_wakeup_enable(sc->dev, enabled);
 346         mutex_unlock(&sc->mutex);
 347 }
 348
 349 void ath9k_init_wow(struct ieee80211_hw *hw)
 350 {
 351         struct ath_softc *sc = hw->priv;
 352
 353         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_WOW_DEVICE_CAPABLE) &&
 354             (sc->driver_data & ATH9K_PCI_WOW) &&
 355             device_can_wakeup(sc->dev))
 356                 hw->wiphy->wowlan = &ath9k_wowlan_support;
 357
 358         atomic_set(&sc->wow_sleep_proc_intr, -1);
 359         atomic_set(&sc->wow_got_bmiss_intr, -1);
 360 }