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