| 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_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 | |
| 26 | static 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 | |
| 33 | static 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 | |
| 50 | static 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 filter |
| 64 | * |
| 65 | * 2 bytes 2 byte 6 bytes 6 bytes 6 bytes |
| 66 | * +--------------+----------+---------+--------+--------+---- |
| 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 byte |
| 72 | * of 'Frame Control' and DA, SA, and BSSID fields |
| 73 | * (skipping 2nd byte of FC and Duration feild. |
| 74 | * |
| 75 | * Disassociate pattern |
| 76 | * -------------------- |
| 77 | * Frame control = 00 00 1010 |
| 78 | * DA, SA, BSSID = x:x:x:x:x:x |
| 79 | * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x |
| 80 | * | x:x:x:x:x:x -- 22 bytes |
| 81 | * |
| 82 | * Deauthenticate pattern |
| 83 | * ---------------------- |
| 84 | * Frame control = 00 00 1100 |
| 85 | * DA, SA, BSSID = x:x:x:x:x:x |
| 86 | * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x |
| 87 | * | x:x:x:x:x:x -- 22 bytes |
| 88 | */ |
| 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 broadcast |
| 103 | * mac address or an unicast to this station |
| 104 | */ |
| 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 frame |
| 128 | * control field gets changed from 0xA0 to 0xC0 |
| 129 | */ |
| 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); |
| 134 | exit: |
| 135 | return ret; |
| 136 | } |
| 137 | |
| 138 | static 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 | |
| 167 | int 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/deauth |
| 229 | * 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 only |
| 250 | * when we go to sleep. We save the current interrupt mask |
| 251 | * so we can restore it after the system wakes up |
| 252 | */ |
| 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 already |
| 264 | * disabled interrupts and not holding a spin lock |
| 265 | */ |
| 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); |
| 275 | fail_wow: |
| 276 | mutex_unlock(&sc->mutex); |
| 277 | return ret; |
| 278 | } |
| 279 | |
| 280 | int 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 | |
| 314 | void 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 | |
| 327 | void 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 | else |
| 336 | hw->wiphy->wowlan = &ath9k_wowlan_support_legacy; |
| 337 | |
| 338 | device_init_wakeup(sc->dev, 1); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | void 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 | } |