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 ath9k_deinit_channel_context(sc); 197 198 mutex_lock(&sc->mutex); 199 200 ath_cancel_work(sc); 201 ath_stop_ani(sc); 202 203 if (test_bit(ATH_OP_INVALID, &common->op_flags)) { 204 ath_dbg(common, ANY, "Device not present\n"); 205 ret = -EINVAL; 206 goto fail_wow; 207 } 208 209 if (WARN_ON(!wowlan)) { 210 ath_dbg(common, WOW, "None of the WoW triggers enabled\n"); 211 ret = -EINVAL; 212 goto fail_wow; 213 } 214 215 if (!device_can_wakeup(sc->dev)) { 216 ath_dbg(common, WOW, "device_can_wakeup failed, WoW is not enabled\n"); 217 ret = 1; 218 goto fail_wow; 219 } 220 221 /* 222 * none of the sta vifs are associated 223 * and we are not currently handling multivif 224 * cases, for instance we have to seperately 225 * configure 'keep alive frame' for each 226 * STA. 227 */ 228 229 if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) { 230 ath_dbg(common, WOW, "None of the STA vifs are associated\n"); 231 ret = 1; 232 goto fail_wow; 233 } 234 235 if (sc->cur_chan->nvifs > 1) { 236 ath_dbg(common, WOW, "WoW for multivif is not yet supported\n"); 237 ret = 1; 238 goto fail_wow; 239 } 240 241 ath9k_wow_map_triggers(sc, wowlan, &wow_triggers_enabled); 242 243 ath_dbg(common, WOW, "WoW triggers enabled 0x%x\n", 244 wow_triggers_enabled); 245 246 ath9k_ps_wakeup(sc); 247 248 ath9k_stop_btcoex(sc); 249 250 /* 251 * Enable wake up on recieving disassoc/deauth 252 * frame by default. 253 */ 254 ath9k_wow_add_disassoc_deauth_pattern(sc); 255 256 if (wow_triggers_enabled & AH_WOW_USER_PATTERN_EN) 257 ath9k_wow_add_pattern(sc, wowlan); 258 259 spin_lock_bh(&sc->sc_pcu_lock); 260 /* 261 * To avoid false wake, we enable beacon miss interrupt only 262 * when we go to sleep. We save the current interrupt mask 263 * so we can restore it after the system wakes up 264 */ 265 sc->wow_intr_before_sleep = ah->imask; 266 ah->imask &= ~ATH9K_INT_GLOBAL; 267 ath9k_hw_disable_interrupts(ah); 268 ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL; 269 ath9k_hw_set_interrupts(ah); 270 ath9k_hw_enable_interrupts(ah); 271 272 spin_unlock_bh(&sc->sc_pcu_lock); 273 274 /* 275 * we can now sync irq and kill any running tasklets, since we already 276 * disabled interrupts and not holding a spin lock 277 */ 278 synchronize_irq(sc->irq); 279 tasklet_kill(&sc->intr_tq); 280 281 ath9k_hw_wow_enable(ah, wow_triggers_enabled); 282 283 ath9k_ps_restore(sc); 284 ath_dbg(common, ANY, "WoW enabled in ath9k\n"); 285 atomic_inc(&sc->wow_sleep_proc_intr); 286 287 fail_wow: 288 mutex_unlock(&sc->mutex); 289 return ret; 290 } 291 292 int ath9k_resume(struct ieee80211_hw *hw) 293 { 294 struct ath_softc *sc = hw->priv; 295 struct ath_hw *ah = sc->sc_ah; 296 struct ath_common *common = ath9k_hw_common(ah); 297 u32 wow_status; 298 299 mutex_lock(&sc->mutex); 300 301 ath9k_ps_wakeup(sc); 302 303 spin_lock_bh(&sc->sc_pcu_lock); 304 305 ath9k_hw_disable_interrupts(ah); 306 ah->imask = sc->wow_intr_before_sleep; 307 ath9k_hw_set_interrupts(ah); 308 ath9k_hw_enable_interrupts(ah); 309 310 spin_unlock_bh(&sc->sc_pcu_lock); 311 312 wow_status = ath9k_hw_wow_wakeup(ah); 313 314 if (atomic_read(&sc->wow_got_bmiss_intr) == 0) { 315 /* 316 * some devices may not pick beacon miss 317 * as the reason they woke up so we add 318 * that here for that shortcoming. 319 */ 320 wow_status |= AH_WOW_BEACON_MISS; 321 atomic_dec(&sc->wow_got_bmiss_intr); 322 ath_dbg(common, ANY, "Beacon miss interrupt picked up during WoW sleep\n"); 323 } 324 325 atomic_dec(&sc->wow_sleep_proc_intr); 326 327 if (wow_status) { 328 ath_dbg(common, ANY, "Waking up due to WoW triggers %s with WoW status = %x\n", 329 ath9k_hw_wow_event_to_string(wow_status), wow_status); 330 } 331 332 ath_restart_work(sc); 333 ath9k_start_btcoex(sc); 334 335 ath9k_ps_restore(sc); 336 mutex_unlock(&sc->mutex); 337 338 return 0; 339 } 340 341 void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled) 342 { 343 struct ath_softc *sc = hw->priv; 344 345 mutex_lock(&sc->mutex); 346 device_init_wakeup(sc->dev, 1); 347 device_set_wakeup_enable(sc->dev, enabled); 348 mutex_unlock(&sc->mutex); 349 } 350 351 void ath9k_init_wow(struct ieee80211_hw *hw) 352 { 353 struct ath_softc *sc = hw->priv; 354 355 if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_WOW_DEVICE_CAPABLE) && 356 (sc->driver_data & ATH9K_PCI_WOW) && 357 device_can_wakeup(sc->dev)) 358 hw->wiphy->wowlan = &ath9k_wowlan_support; 359 360 atomic_set(&sc->wow_sleep_proc_intr, -1); 361 atomic_set(&sc->wow_got_bmiss_intr, -1); 362 } 363