diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/wow.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/wow.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/wow.c b/drivers/net/wireless/ath/ath9k/wow.c new file mode 100644 index 000000000..8d0b1730a --- /dev/null +++ b/drivers/net/wireless/ath/ath9k/wow.c @@ -0,0 +1,348 @@ +/* + * Copyright (c) 2013 Qualcomm Atheros, Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "ath9k.h" + +static const struct wiphy_wowlan_support ath9k_wowlan_support_legacy = { + .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT, + .n_patterns = MAX_NUM_USER_PATTERN, + .pattern_min_len = 1, + .pattern_max_len = MAX_PATTERN_SIZE, +}; + +static const struct wiphy_wowlan_support ath9k_wowlan_support = { + .flags = WIPHY_WOWLAN_MAGIC_PKT | WIPHY_WOWLAN_DISCONNECT, + .n_patterns = MAX_NUM_PATTERN - 2, + .pattern_min_len = 1, + .pattern_max_len = MAX_PATTERN_SIZE, +}; + +static u8 ath9k_wow_map_triggers(struct ath_softc *sc, + struct cfg80211_wowlan *wowlan) +{ + u8 wow_triggers = 0; + + if (wowlan->disconnect) + wow_triggers |= AH_WOW_LINK_CHANGE | + AH_WOW_BEACON_MISS; + if (wowlan->magic_pkt) + wow_triggers |= AH_WOW_MAGIC_PATTERN_EN; + + if (wowlan->n_patterns) + wow_triggers |= AH_WOW_USER_PATTERN_EN; + + return wow_triggers; +} + +static int ath9k_wow_add_disassoc_deauth_pattern(struct ath_softc *sc) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + int pattern_count = 0; + int ret, i, byte_cnt = 0; + u8 dis_deauth_pattern[MAX_PATTERN_SIZE]; + u8 dis_deauth_mask[MAX_PATTERN_SIZE]; + + memset(dis_deauth_pattern, 0, MAX_PATTERN_SIZE); + memset(dis_deauth_mask, 0, MAX_PATTERN_SIZE); + + /* + * Create Dissassociate / Deauthenticate packet filter + * + * 2 bytes 2 byte 6 bytes 6 bytes 6 bytes + * +--------------+----------+---------+--------+--------+---- + * + Frame Control+ Duration + DA + SA + BSSID + + * +--------------+----------+---------+--------+--------+---- + * + * The above is the management frame format for disassociate/ + * deauthenticate pattern, from this we need to match the first byte + * of 'Frame Control' and DA, SA, and BSSID fields + * (skipping 2nd byte of FC and Duration feild. + * + * Disassociate pattern + * -------------------- + * Frame control = 00 00 1010 + * DA, SA, BSSID = x:x:x:x:x:x + * Pattern will be A0000000 | x:x:x:x:x:x | x:x:x:x:x:x + * | x:x:x:x:x:x -- 22 bytes + * + * Deauthenticate pattern + * ---------------------- + * Frame control = 00 00 1100 + * DA, SA, BSSID = x:x:x:x:x:x + * Pattern will be C0000000 | x:x:x:x:x:x | x:x:x:x:x:x + * | x:x:x:x:x:x -- 22 bytes + */ + + /* Fill out the mask with all FF's */ + for (i = 0; i < MAX_PATTERN_MASK_SIZE; i++) + dis_deauth_mask[i] = 0xff; + + /* copy the first byte of frame control field */ + dis_deauth_pattern[byte_cnt] = 0xa0; + byte_cnt++; + + /* skip 2nd byte of frame control and Duration field */ + byte_cnt += 3; + + /* + * need not match the destination mac address, it can be a broadcast + * mac address or an unicast to this station + */ + byte_cnt += 6; + + /* copy the source mac address */ + memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN); + + byte_cnt += 6; + + /* copy the bssid, its same as the source mac address */ + memcpy((dis_deauth_pattern + byte_cnt), common->curbssid, ETH_ALEN); + + /* Create Disassociate pattern mask */ + dis_deauth_mask[0] = 0xfe; + dis_deauth_mask[1] = 0x03; + dis_deauth_mask[2] = 0xc0; + + ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask, + pattern_count, byte_cnt); + if (ret) + goto exit; + + pattern_count++; + /* + * for de-authenticate pattern, only the first byte of the frame + * control field gets changed from 0xA0 to 0xC0 + */ + dis_deauth_pattern[0] = 0xC0; + + ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask, + pattern_count, byte_cnt); +exit: + return ret; +} + +static int ath9k_wow_add_pattern(struct ath_softc *sc, + struct cfg80211_wowlan *wowlan) +{ + struct ath_hw *ah = sc->sc_ah; + struct cfg80211_pkt_pattern *patterns = wowlan->patterns; + u8 wow_pattern[MAX_PATTERN_SIZE]; + u8 wow_mask[MAX_PATTERN_SIZE]; + int mask_len, ret = 0; + s8 i = 0; + + for (i = 0; i < wowlan->n_patterns; i++) { + mask_len = DIV_ROUND_UP(patterns[i].pattern_len, 8); + memset(wow_pattern, 0, MAX_PATTERN_SIZE); + memset(wow_mask, 0, MAX_PATTERN_SIZE); + memcpy(wow_pattern, patterns[i].pattern, patterns[i].pattern_len); + memcpy(wow_mask, patterns[i].mask, mask_len); + + ret = ath9k_hw_wow_apply_pattern(ah, + wow_pattern, + wow_mask, + i + 2, + patterns[i].pattern_len); + if (ret) + break; + } + + return ret; +} + +int ath9k_suspend(struct ieee80211_hw *hw, + struct cfg80211_wowlan *wowlan) +{ + struct ath_softc *sc = hw->priv; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + u8 triggers; + int ret = 0; + + ath9k_deinit_channel_context(sc); + + mutex_lock(&sc->mutex); + + if (test_bit(ATH_OP_INVALID, &common->op_flags)) { + ath_err(common, "Device not present\n"); + ret = -ENODEV; + goto fail_wow; + } + + if (WARN_ON(!wowlan)) { + ath_err(common, "None of the WoW triggers enabled\n"); + ret = -EINVAL; + goto fail_wow; + } + + if (sc->cur_chan->nvifs > 1) { + ath_dbg(common, WOW, "WoW for multivif is not yet supported\n"); + ret = 1; + goto fail_wow; + } + + if (ath9k_is_chanctx_enabled()) { + if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) { + ath_dbg(common, WOW, + "Multi-channel WOW is not supported\n"); + ret = 1; + goto fail_wow; + } + } + + if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) { + ath_dbg(common, WOW, "None of the STA vifs are associated\n"); + ret = 1; + goto fail_wow; + } + + triggers = ath9k_wow_map_triggers(sc, wowlan); + if (!triggers) { + ath_dbg(common, WOW, "No valid WoW triggers\n"); + ret = 1; + goto fail_wow; + } + + ath_cancel_work(sc); + ath_stop_ani(sc); + + ath9k_ps_wakeup(sc); + + ath9k_stop_btcoex(sc); + + /* + * Enable wake up on recieving disassoc/deauth + * frame by default. + */ + ret = ath9k_wow_add_disassoc_deauth_pattern(sc); + if (ret) { + ath_err(common, + "Unable to add disassoc/deauth pattern: %d\n", ret); + goto fail_wow; + } + + if (triggers & AH_WOW_USER_PATTERN_EN) { + ret = ath9k_wow_add_pattern(sc, wowlan); + if (ret) { + ath_err(common, + "Unable to add user pattern: %d\n", ret); + goto fail_wow; + } + } + + spin_lock_bh(&sc->sc_pcu_lock); + /* + * To avoid false wake, we enable beacon miss interrupt only + * when we go to sleep. We save the current interrupt mask + * so we can restore it after the system wakes up + */ + sc->wow_intr_before_sleep = ah->imask; + ah->imask &= ~ATH9K_INT_GLOBAL; + ath9k_hw_disable_interrupts(ah); + ah->imask = ATH9K_INT_BMISS | ATH9K_INT_GLOBAL; + ath9k_hw_set_interrupts(ah); + ath9k_hw_enable_interrupts(ah); + + spin_unlock_bh(&sc->sc_pcu_lock); + + /* + * we can now sync irq and kill any running tasklets, since we already + * disabled interrupts and not holding a spin lock + */ + synchronize_irq(sc->irq); + tasklet_kill(&sc->intr_tq); + + ath9k_hw_wow_enable(ah, triggers); + + ath9k_ps_restore(sc); + ath_dbg(common, WOW, "Suspend with WoW triggers: 0x%x\n", triggers); + + set_bit(ATH_OP_WOW_ENABLED, &common->op_flags); +fail_wow: + mutex_unlock(&sc->mutex); + return ret; +} + +int ath9k_resume(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + u8 status; + + mutex_lock(&sc->mutex); + + ath9k_ps_wakeup(sc); + + spin_lock_bh(&sc->sc_pcu_lock); + + ath9k_hw_disable_interrupts(ah); + ah->imask = sc->wow_intr_before_sleep; + ath9k_hw_set_interrupts(ah); + ath9k_hw_enable_interrupts(ah); + + spin_unlock_bh(&sc->sc_pcu_lock); + + status = ath9k_hw_wow_wakeup(ah); + ath_dbg(common, WOW, "Resume with WoW status: 0x%x\n", status); + + ath_restart_work(sc); + ath9k_start_btcoex(sc); + + clear_bit(ATH_OP_WOW_ENABLED, &common->op_flags); + + ath9k_ps_restore(sc); + mutex_unlock(&sc->mutex); + + return 0; +} + +void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled) +{ + struct ath_softc *sc = hw->priv; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + mutex_lock(&sc->mutex); + device_set_wakeup_enable(sc->dev, enabled); + mutex_unlock(&sc->mutex); + + ath_dbg(common, WOW, "WoW wakeup source is %s\n", + (enabled) ? "enabled" : "disabled"); +} + +void ath9k_init_wow(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + struct ath_hw *ah = sc->sc_ah; + + if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) { + if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565_11_OR_LATER(ah)) + hw->wiphy->wowlan = &ath9k_wowlan_support; + else + hw->wiphy->wowlan = &ath9k_wowlan_support_legacy; + + device_init_wakeup(sc->dev, 1); + } +} + +void ath9k_deinit_wow(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + + if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) + device_init_wakeup(sc->dev, 0); +} |