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1/*2 * Copyright (c) 2013 Qualcomm Atheros, Inc.3 *4 * Permission to use, copy, modify, and/or distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16 17#include "ath9k.h"18 19static const struct wiphy_wowlan_support ath9k_wowlan_support_legacy = {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 26static const struct wiphy_wowlan_support ath9k_wowlan_support = {27 .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT,28 .n_patterns = MAX_NUM_PATTERN - 2,29 .pattern_min_len = 1,30 .pattern_max_len = MAX_PATTERN_SIZE,31};32 33static u8 ath9k_wow_map_triggers(struct ath_softc *sc,34 struct cfg80211_wowlan *wowlan)35{36 u8 wow_triggers = 0;37 38 if (wowlan->disconnect)39 wow_triggers |= AH_WOW_LINK_CHANGE |40 AH_WOW_BEACON_MISS;41 if (wowlan->magic_pkt)42 wow_triggers |= AH_WOW_MAGIC_PATTERN_EN;43 44 if (wowlan->n_patterns)45 wow_triggers |= AH_WOW_USER_PATTERN_EN;46 47 return wow_triggers;48}49 50static int ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc)51{52 struct ath_hw *ah = sc->sc_ah;53 struct ath_common *common = ath9k_hw_common(ah);54 int pattern_count = 0;55 int ret, i, byte_cnt = 0;56 u8 dis_deauth_pattern[MAX_PATTERN_SIZE];57 u8 dis_deauth_mask[MAX_PATTERN_SIZE];58 59 memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE);60 memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE);61 62 /*63 * Create Dissassociate / Deauthenticate packet filter64 *65 * 2 bytes 2 byte 6 bytes 6 bytes 6 bytes66 * +--------------+----------+---------+--------+--------+----67 * + Frame Control+ Duration + DA + SA + BSSID +68 * +--------------+----------+---------+--------+--------+----69 *70 * The above is the management frame format for disassociate/71 * deauthenticate pattern, from this we need to match the first byte72 * of 'Frame Control' and DA, SA, and BSSID fields73 * (skipping 2nd byte of FC and Duration feild.74 *75 * Disassociate pattern76 * --------------------77 * Frame control = 00 00 101078 * DA, SA, BSSID = x:x:x:x:x:x79 * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x80 * | x:x:x:x:x:x -- 22 bytes81 *82 * Deauthenticate pattern83 * ----------------------84 * Frame control = 00 00 110085 * DA, SA, BSSID = x:x:x:x:x:x86 * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x87 * | x:x:x:x:x:x -- 22 bytes88 */89 90 /* Fill out the mask with all FF's */91 for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++)92 dis_deauth_mask[i] = 0xff;93 94 /* copy the first byte of frame control field */95 dis_deauth_pattern[byte_cnt] = 0xa0;96 byte_cnt++;97 98 /* skip 2nd byte of frame control and Duration field */99 byte_cnt += 3;100 101 /*102 * need not match the destination mac address, it can be a broadcast103 * mac address or an unicast to this station104 */105 byte_cnt += 6;106 107 /* copy the source mac address */108 memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);109 110 byte_cnt += 6;111 112 /* copy the bssid, its same as the source mac address */113 memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN);114 115 /* Create Disassociate pattern mask */116 dis_deauth_mask[0] = 0xfe;117 dis_deauth_mask[1] = 0x03;118 dis_deauth_mask[2] = 0xc0;119 120 ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,121 pattern_count, byte_cnt);122 if (ret)123 goto exit;124 125 pattern_count++;126 /*127 * for de-authenticate pattern, only the first byte of the frame128 * control field gets changed from 0xA0 to 0xC0129 */130 dis_deauth_pattern[0] = 0xC0;131 132 ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,133 pattern_count, byte_cnt);134exit:135 return ret;136}137 138static int ath9k_wow_add_pattern(struct ath_softc *sc,139 struct cfg80211_wowlan *wowlan)140{141 struct ath_hw *ah = sc->sc_ah;142 struct cfg80211_pkt_pattern *patterns = wowlan->patterns;143 u8 wow_pattern[MAX_PATTERN_SIZE];144 u8 wow_mask[MAX_PATTERN_SIZE];145 int mask_len, ret = 0;146 s8 i = 0;147 148 for (i = 0; i < wowlan->n_patterns; i++) {149 mask_len = DIV_ROUND_UP(patterns[i].pattern_len, 8);150 memset(wow_pattern, 0, MAX_PATTERN_SIZE);151 memset(wow_mask, 0, MAX_PATTERN_SIZE);152 memcpy(wow_pattern, patterns[i].pattern, patterns[i].pattern_len);153 memcpy(wow_mask, patterns[i].mask, mask_len);154 155 ret = ath9k_hw_wow_apply_pattern(ah,156 wow_pattern,157 wow_mask,158 i + 2,159 patterns[i].pattern_len);160 if (ret)161 break;162 }163 164 return ret;165}166 167int ath9k_suspend(struct ieee80211_hw *hw,168 struct cfg80211_wowlan *wowlan)169{170 struct ath_softc *sc = hw->priv;171 struct ath_hw *ah = sc->sc_ah;172 struct ath_common *common = ath9k_hw_common(ah);173 u8 triggers;174 int ret = 0;175 176 ath9k_deinit_channel_context(sc);177 178 mutex_lock(&sc->mutex);179 180 if (test_bit(ATH_OP_INVALID, &common->op_flags)) {181 ath_err(common, "Device not present\n");182 ret = -ENODEV;183 goto fail_wow;184 }185 186 if (WARN_ON(!wowlan)) {187 ath_err(common, "None of the WoW triggers enabled\n");188 ret = -EINVAL;189 goto fail_wow;190 }191 192 if (sc->cur_chan->nvifs > 1) {193 ath_dbg(common, WOW, "WoW for multivif is not yet supported\n");194 ret = 1;195 goto fail_wow;196 }197 198 if (ath9k_is_chanctx_enabled()) {199 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {200 ath_dbg(common, WOW,201 "Multi-channel WOW is not supported\n");202 ret = 1;203 goto fail_wow;204 }205 }206 207 if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) {208 ath_dbg(common, WOW, "None of the STA vifs are associated\n");209 ret = 1;210 goto fail_wow;211 }212 213 triggers = ath9k_wow_map_triggers(sc, wowlan);214 if (!triggers) {215 ath_dbg(common, WOW, "No valid WoW triggers\n");216 ret = 1;217 goto fail_wow;218 }219 220 ath_cancel_work(sc);221 ath_stop_ani(sc);222 223 ath9k_ps_wakeup(sc);224 225 ath9k_stop_btcoex(sc);226 227 /*228 * Enable wake up on recieving disassoc/deauth229 * frame by default.230 */231 ret = ath9k_wow_add_disassoc_deauth_pattern(sc);232 if (ret) {233 ath_err(common,234 "Unable to add disassoc/deauth pattern: %d\n", ret);235 goto fail_wow;236 }237 238 if (triggers & AH_WOW_USER_PATTERN_EN) {239 ret = ath9k_wow_add_pattern(sc, wowlan);240 if (ret) {241 ath_err(common,242 "Unable to add user pattern: %d\n", ret);243 goto fail_wow;244 }245 }246 247 spin_lock_bh(&sc->sc_pcu_lock);248 /*249 * To avoid false wake, we enable beacon miss interrupt only250 * when we go to sleep. We save the current interrupt mask251 * so we can restore it after the system wakes up252 */253 sc->wow_intr_before_sleep = ah->imask;254 ah->imask &= ~ATH9K_INT_GLOBAL;255 ath9k_hw_disable_interrupts(ah);256 ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL;257 ath9k_hw_set_interrupts(ah);258 ath9k_hw_enable_interrupts(ah);259 260 spin_unlock_bh(&sc->sc_pcu_lock);261 262 /*263 * we can now sync irq and kill any running tasklets, since we already264 * disabled interrupts and not holding a spin lock265 */266 synchronize_irq(sc->irq);267 tasklet_kill(&sc->intr_tq);268 269 ath9k_hw_wow_enable(ah, triggers);270 271 ath9k_ps_restore(sc);272 ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n", triggers);273 274 set_bit(ATH_OP_WOW_ENABLED, &common->op_flags);275fail_wow:276 mutex_unlock(&sc->mutex);277 return ret;278}279 280int ath9k_resume(struct ieee80211_hw *hw)281{282 struct ath_softc *sc = hw->priv;283 struct ath_hw *ah = sc->sc_ah;284 struct ath_common *common = ath9k_hw_common(ah);285 u8 status;286 287 mutex_lock(&sc->mutex);288 289 ath9k_ps_wakeup(sc);290 291 spin_lock_bh(&sc->sc_pcu_lock);292 293 ath9k_hw_disable_interrupts(ah);294 ah->imask = sc->wow_intr_before_sleep;295 ath9k_hw_set_interrupts(ah);296 ath9k_hw_enable_interrupts(ah);297 298 spin_unlock_bh(&sc->sc_pcu_lock);299 300 status = ath9k_hw_wow_wakeup(ah);301 ath_dbg(common, WOW, "Resume with WoW status: 0x%x\n", status);302 303 ath_restart_work(sc);304 ath9k_start_btcoex(sc);305 306 clear_bit(ATH_OP_WOW_ENABLED, &common->op_flags);307 308 ath9k_ps_restore(sc);309 mutex_unlock(&sc->mutex);310 311 return 0;312}313 314void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled)315{316 struct ath_softc *sc = hw->priv;317 struct ath_common *common = ath9k_hw_common(sc->sc_ah);318 319 mutex_lock(&sc->mutex);320 device_set_wakeup_enable(sc->dev, enabled);321 mutex_unlock(&sc->mutex);322 323 ath_dbg(common, WOW, "WoW wakeup source is %s\n",324 (enabled) ? "enabled" : "disabled");325}326 327void ath9k_init_wow(struct ieee80211_hw *hw)328{329 struct ath_softc *sc = hw->priv;330 struct ath_hw *ah = sc->sc_ah;331 332 if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) {333 if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565_11_OR_LATER(ah))334 hw->wiphy->wowlan = &ath9k_wowlan_support;335 else336 hw->wiphy->wowlan = &ath9k_wowlan_support_legacy;337 338 device_init_wakeup(sc->dev, 1);339 }340}341 342void ath9k_deinit_wow(struct ieee80211_hw *hw)343{344 struct ath_softc *sc = hw->priv;345 346 if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow)347 device_init_wakeup(sc->dev, 0);348}349