/* * 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.
*/
/* * Create Disassociate / 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 field. * * 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);
ret = ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask,
pattern_count, byte_cnt); if (ret) gotoexit;
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;
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 receiving 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);
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