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author | Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com> | 2012-07-10 14:56:52 +0530 |
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committer | John W. Linville <linville@tuxdriver.com> | 2012-07-12 15:27:17 -0400 |
commit | b11e640aef3e23ef3834ce95b27640d28680c79b (patch) | |
tree | 9d350ee2d51a4ad790f49c6f229819371c687a49 /drivers/net/wireless/ath/ath9k/main.c | |
parent | b3ba6c529b80e714b8941a7fa7397272afc685b6 (diff) | |
download | linux-b11e640aef3e23ef3834ce95b27640d28680c79b.tar.gz linux-b11e640aef3e23ef3834ce95b27640d28680c79b.tar.bz2 linux-b11e640aef3e23ef3834ce95b27640d28680c79b.zip |
ath9k: Add WoW related mac80211 callbacks
add suspend/resume/set_wakeup callbacks to the driver
*suspend
- bail out only if all the conditions for configuring WoW.
is fine, currently multivif case is not handled
- check for associated state.
- map wow triggers from user space data.
- add deauth/disassoc pattern and user defined pattern,
for the later a list is maintained.
- store the interrupt mask before suspend, enabled beacon
miss interrupt for WoW.
- configure WoW in the hardware by calling ath9k_hw_wow_enable.
*resume
- restore the interrupts based on the interrupt mask
stored before suspend.
- call ath9k_hw_wow_wakeup to configure/restore the hardware.
- after wow wakeup clear away WoW events and query the
WoW wakeup reason from the status register
*set_wakeup
- to call 'device_set_wakeup_enable' from cfg80211/mac80211
when wow is configured and as per Rafael/Johannnes the
right way to do so rather in the driver suspend/resume
call back
Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Cc: vadivel@qca.qualcomm.com
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/main.c')
-rw-r--r-- | drivers/net/wireless/ath/ath9k/main.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 248e5b24acfa..01a5f1814bc8 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -493,6 +493,17 @@ irqreturn_t ath_isr(int irq, void *dev) if (status & SCHED_INTR) sched = true; +#ifdef CONFIG_PM_SLEEP + if (status & ATH9K_INT_BMISS) { + if (atomic_read(&sc->wow_sleep_proc_intr) == 0) { + ath_dbg(common, ANY, "during WoW we got a BMISS\n"); + atomic_inc(&sc->wow_got_bmiss_intr); + atomic_dec(&sc->wow_sleep_proc_intr); + } + ath_dbg(common, INTERRUPT, "beacon miss interrupt\n"); + } +#endif + /* * If a FATAL or RXORN interrupt is received, we have to reset the * chip immediately. @@ -2075,6 +2086,362 @@ static void ath9k_get_et_stats(struct ieee80211_hw *hw, #endif +#ifdef CONFIG_PM_SLEEP + +static void ath9k_wow_map_triggers(struct ath_softc *sc, + struct cfg80211_wowlan *wowlan, + u32 *wow_triggers) +{ + 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; + + sc->wow_enabled = *wow_triggers; + +} + +static void 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); + struct ath9k_hw_capabilities *pcaps = &ah->caps; + int pattern_count = 0; + int i, byte_cnt; + 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 + */ + + /* Create Disassociate Pattern first */ + + byte_cnt = 0; + + /* 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 */ + + if (pcaps->hw_caps & ATH9K_HW_WOW_PATTERN_MATCH_EXACT) { + + if (pcaps->hw_caps & ATH9K_HW_WOW_PATTERN_MATCH_DWORD) { + /* + * for AR9280, because of hardware limitation, the + * first 4 bytes have to be matched for all patterns. + * the mask for disassociation and de-auth pattern + * matching need to enable the first 4 bytes. + * also the duration field needs to be filled. + */ + dis_deauth_mask[0] = 0xf0; + + /* + * fill in duration field + FIXME: what is the exact value ? + */ + dis_deauth_pattern[2] = 0xff; + dis_deauth_pattern[3] = 0xff; + } else { + dis_deauth_mask[0] = 0xfe; + } + + dis_deauth_mask[1] = 0x03; + dis_deauth_mask[2] = 0xc0; + } else { + dis_deauth_mask[0] = 0xef; + dis_deauth_mask[1] = 0x3f; + dis_deauth_mask[2] = 0x00; + dis_deauth_mask[3] = 0xfc; + } + + ath_dbg(common, WOW, "Adding disassoc/deauth patterns for WoW\n"); + + ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask, + pattern_count, byte_cnt); + + 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; + + ath9k_hw_wow_apply_pattern(ah, dis_deauth_pattern, dis_deauth_mask, + pattern_count, byte_cnt); + +} + +static void ath9k_wow_add_pattern(struct ath_softc *sc, + struct cfg80211_wowlan *wowlan) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath9k_wow_pattern *wow_pattern = NULL; + struct cfg80211_wowlan_trig_pkt_pattern *patterns = wowlan->patterns; + int mask_len; + s8 i = 0; + + if (!wowlan->n_patterns) + return; + + /* + * Add the new user configured patterns + */ + for (i = 0; i < wowlan->n_patterns; i++) { + + wow_pattern = kzalloc(sizeof(*wow_pattern), GFP_KERNEL); + + if (!wow_pattern) + return; + + /* + * TODO: convert the generic user space pattern to + * appropriate chip specific/802.11 pattern. + */ + + mask_len = DIV_ROUND_UP(wowlan->patterns[i].pattern_len, 8); + memset(wow_pattern->pattern_bytes, 0, MAX_PATTERN_SIZE); + memset(wow_pattern->mask_bytes, 0, MAX_PATTERN_SIZE); + memcpy(wow_pattern->pattern_bytes, patterns[i].pattern, + patterns[i].pattern_len); + memcpy(wow_pattern->mask_bytes, patterns[i].mask, mask_len); + wow_pattern->pattern_len = patterns[i].pattern_len; + + /* + * just need to take care of deauth and disssoc pattern, + * make sure we don't overwrite them. + */ + + ath9k_hw_wow_apply_pattern(ah, wow_pattern->pattern_bytes, + wow_pattern->mask_bytes, + i + 2, + wow_pattern->pattern_len); + kfree(wow_pattern); + + } + +} + +static 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); + u32 wow_triggers_enabled = 0; + int ret = 0; + + mutex_lock(&sc->mutex); + + ath_cancel_work(sc); + del_timer_sync(&common->ani.timer); + del_timer_sync(&sc->rx_poll_timer); + + if (test_bit(SC_OP_INVALID, &sc->sc_flags)) { + ath_dbg(common, ANY, "Device not present\n"); + ret = -EINVAL; + goto fail_wow; + } + + if (WARN_ON(!wowlan)) { + ath_dbg(common, WOW, "None of the WoW triggers enabled\n"); + ret = -EINVAL; + goto fail_wow; + } + + if (!device_can_wakeup(sc->dev)) { + ath_dbg(common, WOW, "device_can_wakeup failed, WoW is not enabled\n"); + ret = 1; + goto fail_wow; + } + + /* + * none of the sta vifs are associated + * and we are not currently handling multivif + * cases, for instance we have to seperately + * configure 'keep alive frame' for each + * STA. + */ + + if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { + ath_dbg(common, WOW, "None of the STA vifs are associated\n"); + ret = 1; + goto fail_wow; + } + + if (sc->nvifs > 1) { + ath_dbg(common, WOW, "WoW for multivif is not yet supported\n"); + ret = 1; + goto fail_wow; + } + + ath9k_wow_map_triggers(sc, wowlan, &wow_triggers_enabled); + + ath_dbg(common, WOW, "WoW triggers enabled 0x%x\n", + wow_triggers_enabled); + + ath9k_ps_wakeup(sc); + + ath9k_stop_btcoex(sc); + + /* + * Enable wake up on recieving disassoc/deauth + * frame by default. + */ + ath9k_wow_add_disassoc_deauth_pattern(sc); + + if (wow_triggers_enabled & AH_WOW_USER_PATTERN_EN) + ath9k_wow_add_pattern(sc, wowlan); + + 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, wow_triggers_enabled); + + ath9k_ps_restore(sc); + ath_dbg(common, ANY, "WoW enabled in ath9k\n"); + atomic_inc(&sc->wow_sleep_proc_intr); + +fail_wow: + mutex_unlock(&sc->mutex); + return ret; +} + +static 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); + u32 wow_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); + + wow_status = ath9k_hw_wow_wakeup(ah); + + if (atomic_read(&sc->wow_got_bmiss_intr) == 0) { + /* + * some devices may not pick beacon miss + * as the reason they woke up so we add + * that here for that shortcoming. + */ + wow_status |= AH_WOW_BEACON_MISS; + atomic_dec(&sc->wow_got_bmiss_intr); + ath_dbg(common, ANY, "Beacon miss interrupt picked up during WoW sleep\n"); + } + + atomic_dec(&sc->wow_sleep_proc_intr); + + if (wow_status) { + ath_dbg(common, ANY, "Waking up due to WoW triggers %s with WoW status = %x\n", + ath9k_hw_wow_event_to_string(wow_status), wow_status); + } + + ath_restart_work(sc); + ath9k_start_btcoex(sc); + + ath9k_ps_restore(sc); + mutex_unlock(&sc->mutex); + + return 0; +} + +static void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled) +{ + struct ath_softc *sc = hw->priv; + + mutex_lock(&sc->mutex); + device_init_wakeup(sc->dev, 1); + device_set_wakeup_enable(sc->dev, enabled); + mutex_unlock(&sc->mutex); +} + +#endif + struct ieee80211_ops ath9k_ops = { .tx = ath9k_tx, .start = ath9k_start, @@ -2104,6 +2471,12 @@ struct ieee80211_ops ath9k_ops = { .set_antenna = ath9k_set_antenna, .get_antenna = ath9k_get_antenna, +#ifdef CONFIG_PM_SLEEP + .suspend = ath9k_suspend, + .resume = ath9k_resume, + .set_wakeup = ath9k_set_wakeup, +#endif + #ifdef CONFIG_ATH9K_DEBUGFS .get_et_sset_count = ath9k_get_et_sset_count, .get_et_stats = ath9k_get_et_stats, |