[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wireless / wl12xx / event.c

/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "wl12xx.h"
#include "reg.h"
#include "io.h"
#include "event.h"
#include "ps.h"
#include "scan.h"
#include "wl12xx_80211.h"

void wl1271_pspoll_work(struct work_struct *work)
{
	struct delayed_work *dwork;
	struct wl1271 *wl;

	dwork = container_of(work, struct delayed_work, work);
	wl = container_of(dwork, struct wl1271, pspoll_work);

	wl1271_debug(DEBUG_EVENT, "pspoll work");

	mutex_lock(&wl->mutex);

	if (unlikely(wl->state == WL1271_STATE_OFF))
		goto out;

	if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
		goto out;

	if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
		goto out;

	/*
	 * if we end up here, then we were in powersave when the pspoll
	 * delivery failure occurred, and no-one changed state since, so
	 * we should go back to powersave.
	 */
	wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);

out:
	mutex_unlock(&wl->mutex);
};

static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
{
	int delay = wl->conf.conn.ps_poll_recovery_period;
	int ret;

	wl->ps_poll_failures++;
	if (wl->ps_poll_failures == 1)
		wl1271_info("AP with dysfunctional ps-poll, "
			    "trying to work around it.");

	/* force active mode receive data from the AP */
	if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
		ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
					 wl->basic_rate, true);
		if (ret < 0)
			return;
		set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
		ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
					     msecs_to_jiffies(delay));
	}

	/*
	 * If already in active mode, lets we should be getting data from
	 * the AP right away. If we enter PSM too fast after this, and data
	 * remains on the AP, we will get another event like this, and we'll
	 * go into active once more.
	 */
}

static int wl1271_event_ps_report(struct wl1271 *wl,
				  struct event_mailbox *mbox,
				  bool *beacon_loss)
{
	int ret = 0;
	u32 total_retries = wl->conf.conn.psm_entry_retries;

	wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);

	switch (mbox->ps_status) {
	case EVENT_ENTER_POWER_SAVE_FAIL:
		wl1271_debug(DEBUG_PSM, "PSM entry failed");

		if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
			/* remain in active mode */
			wl->psm_entry_retry = 0;
			break;
		}

		if (wl->psm_entry_retry < total_retries) {
			wl->psm_entry_retry++;
			ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
						 wl->basic_rate, true);
		} else {
			wl1271_info("No ack to nullfunc from AP.");
			wl->psm_entry_retry = 0;
			*beacon_loss = true;
		}
		break;
	case EVENT_ENTER_POWER_SAVE_SUCCESS:
		wl->psm_entry_retry = 0;

		/* enable beacon filtering */
		ret = wl1271_acx_beacon_filter_opt(wl, true);
		if (ret < 0)
			break;

		/* enable beacon early termination */
		ret = wl1271_acx_bet_enable(wl, true);
		if (ret < 0)
			break;

		/* go to extremely low power mode */
		wl1271_ps_elp_sleep(wl);
		break;
	default:
		break;
	}

	return ret;
}

static void wl1271_event_rssi_trigger(struct wl1271 *wl,
				      struct event_mailbox *mbox)
{
	enum nl80211_cqm_rssi_threshold_event event;
	s8 metric = mbox->rssi_snr_trigger_metric[0];

	wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);

	if (metric <= wl->rssi_thold)
		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
	else
		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;

	if (event != wl->last_rssi_event)
		ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
	wl->last_rssi_event = event;
}

static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
{
	wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
	wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
	wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
}

static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
{
	int ret;
	u32 vector;
	bool beacon_loss = false;
	bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);

	wl1271_event_mbox_dump(mbox);

	vector = le32_to_cpu(mbox->events_vector);
	vector &= ~(le32_to_cpu(mbox->events_mask));
	wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);

	if (vector & SCAN_COMPLETE_EVENT_ID) {
		wl1271_debug(DEBUG_EVENT, "status: 0x%x",
			     mbox->scheduled_scan_status);

		wl1271_scan_stm(wl);
	}

	/* disable dynamic PS when requested by the firmware */
	if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
	    wl->bss_type == BSS_TYPE_STA_BSS) {
		if (mbox->soft_gemini_sense_info)
			ieee80211_disable_dyn_ps(wl->vif);
		else
			ieee80211_enable_dyn_ps(wl->vif);
	}

	/*
	 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
	 * filtering) is enabled. Without PSM, the stack will receive all
	 * beacons and can detect beacon loss by itself.
	 *
	 * As there's possibility that the driver disables PSM before receiving
	 * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
	 *
	 */
	if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
		wl1271_info("Beacon loss detected.");

		/* indicate to the stack, that beacons have been lost */
		beacon_loss = true;
	}

	if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
		wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
		ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
		if (ret < 0)
			return ret;
	}

	if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
		wl1271_event_pspoll_delivery_fail(wl);

	if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
		wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
		if (wl->vif)
			wl1271_event_rssi_trigger(wl, mbox);
	}

	if (wl->vif && beacon_loss)
		ieee80211_connection_loss(wl->vif);

	return 0;
}

int wl1271_event_unmask(struct wl1271 *wl)
{
	int ret;

	ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
	if (ret < 0)
		return ret;

	return 0;
}

void wl1271_event_mbox_config(struct wl1271 *wl)
{
	wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
	wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);

	wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
		     wl->mbox_ptr[0], wl->mbox_ptr[1]);
}

int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
{
	struct event_mailbox mbox;
	int ret;

	wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);

	if (mbox_num > 1)
		return -EINVAL;

	/* first we read the mbox descriptor */
	wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
		    sizeof(struct event_mailbox), false);

	/* process the descriptor */
	ret = wl1271_event_process(wl, &mbox);
	if (ret < 0)
		return ret;

	/* then we let the firmware know it can go on...*/
	wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);

	return 0;
}
Commit	Line	Data
f5fc0f86 LC	1	/*
	2	* This file is part of wl1271
	3	*
	4	* Copyright (C) 2008-2009 Nokia Corporation
	5	*
	6	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
00d20100 SL	24	#include "wl12xx.h"
	25	#include "reg.h"
	26	#include "io.h"
	27	#include "event.h"
	28	#include "ps.h"
	29	#include "scan.h"
66497dc3	30	#include "wl12xx_80211.h"
f5fc0f86	31
90494a90 JO	32	void wl1271_pspoll_work(struct work_struct *work)
	33	{
	34	struct delayed_work *dwork;
	35	struct wl1271 *wl;
	36
	37	dwork = container_of(work, struct delayed_work, work);
	38	wl = container_of(dwork, struct wl1271, pspoll_work);
	39
	40	wl1271_debug(DEBUG_EVENT, "pspoll work");
	41
	42	mutex_lock(&wl->mutex);
	43
8c7f4f31 JO	44	if (unlikely(wl->state == WL1271_STATE_OFF))
	45	goto out;
	46
90494a90 JO	47	if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
	48	goto out;
	49
	50	if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
	51	goto out;
	52
	53	/*
	54	* if we end up here, then we were in powersave when the pspoll
	55	* delivery failure occurred, and no-one changed state since, so
	56	* we should go back to powersave.
	57	*/
65cddbf1	58	wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);
90494a90 JO	59
	60	out:
	61	mutex_unlock(&wl->mutex);
	62	};
	63
	64	static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
	65	{
	66	int delay = wl->conf.conn.ps_poll_recovery_period;
	67	int ret;
	68
	69	wl->ps_poll_failures++;
	70	if (wl->ps_poll_failures == 1)
	71	wl1271_info("AP with dysfunctional ps-poll, "
	72	"trying to work around it.");
	73
	74	/* force active mode receive data from the AP */
	75	if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
65cddbf1 JO	76	ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
65cddbf1 JO	77	wl->basic_rate, true);
90494a90 JO	78	if (ret < 0)
	79	return;
	80	set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
	81	ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
	82	msecs_to_jiffies(delay));
	83	}
	84
	85	/*
	86	* If already in active mode, lets we should be getting data from
	87	* the AP right away. If we enter PSM too fast after this, and data
	88	* remains on the AP, we will get another event like this, and we'll
	89	* go into active once more.
	90	*/
	91	}
	92
19ad0715 JO	93	static int wl1271_event_ps_report(struct wl1271 *wl,
	94	struct event_mailbox *mbox,
	95	bool *beacon_loss)
	96	{
	97	int ret = 0;
65cddbf1	98	u32 total_retries = wl->conf.conn.psm_entry_retries;
19ad0715 JO	99
	100	wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
	101
	102	switch (mbox->ps_status) {
	103	case EVENT_ENTER_POWER_SAVE_FAIL:
d8c42c0c JO	104	wl1271_debug(DEBUG_PSM, "PSM entry failed");
d8c42c0c JO	105
71449f8d	106	if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
d8c42c0c	107	/* remain in active mode */
461fa136 JO	108	wl->psm_entry_retry = 0;
	109	break;
	110	}
	111
65cddbf1	112	if (wl->psm_entry_retry < total_retries) {
19ad0715	113	wl->psm_entry_retry++;
d8c42c0c	114	ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
8eab7b47	115	wl->basic_rate, true);
19ad0715	116	} else {
1a186a51	117	wl1271_info("No ack to nullfunc from AP.");
19ad0715	118	wl->psm_entry_retry = 0;
d60772f6	119	*beacon_loss = true;
19ad0715 JO	120	}
	121	break;
	122	case EVENT_ENTER_POWER_SAVE_SUCCESS:
	123	wl->psm_entry_retry = 0;
d8c42c0c JO	124
	125	/* enable beacon filtering */
	126	ret = wl1271_acx_beacon_filter_opt(wl, true);
	127	if (ret < 0)
	128	break;
	129
	130	/* enable beacon early termination */
	131	ret = wl1271_acx_bet_enable(wl, true);
	132	if (ret < 0)
	133	break;
	134
	135	/* go to extremely low power mode */
	136	wl1271_ps_elp_sleep(wl);
19ad0715	137	break;
19ad0715 JO	138	default:
	139	break;
	140	}
	141
	142	return ret;
	143	}
	144
00236aed JO	145	static void wl1271_event_rssi_trigger(struct wl1271 *wl,
	146	struct event_mailbox *mbox)
	147	{
	148	enum nl80211_cqm_rssi_threshold_event event;
	149	s8 metric = mbox->rssi_snr_trigger_metric[0];
	150
	151	wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
	152
	153	if (metric <= wl->rssi_thold)
	154	event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
	155	else
	156	event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
	157
	158	if (event != wl->last_rssi_event)
	159	ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
	160	wl->last_rssi_event = event;
	161	}
	162
f5fc0f86 LC	163	static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
	164	{
	165	wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
	166	wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
	167	wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
	168	}
	169
	170	static int wl1271_event_process(struct wl1271 wl, struct event_mailbox mbox)
	171	{
	172	int ret;
	173	u32 vector;
19ad0715	174	bool beacon_loss = false;
203c903c	175	bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
f5fc0f86 LC	176
	177	wl1271_event_mbox_dump(mbox);
	178
d0f63b20 LC	179	vector = le32_to_cpu(mbox->events_vector);
d0f63b20 LC	180	vector &= ~(le32_to_cpu(mbox->events_mask));
f5fc0f86 LC	181	wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
	182
	183	if (vector & SCAN_COMPLETE_EVENT_ID) {
34dd2aaa LC	184	wl1271_debug(DEBUG_EVENT, "status: 0x%x",
	185	mbox->scheduled_scan_status);
	186
08688d6b	187	wl1271_scan_stm(wl);
f5fc0f86 LC	188	}
f5fc0f86 LC	189
8d2ef7bd JO	190	/* disable dynamic PS when requested by the firmware */
	191	if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
	192	wl->bss_type == BSS_TYPE_STA_BSS) {
	193	if (mbox->soft_gemini_sense_info)
f532be6d	194	ieee80211_disable_dyn_ps(wl->vif);
8d2ef7bd	195	else
f532be6d	196	ieee80211_enable_dyn_ps(wl->vif);
8d2ef7bd JO	197	}
8d2ef7bd JO	198
b771eee5 JO	199	/*
	200	* The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
	201	* filtering) is enabled. Without PSM, the stack will receive all
	202	* beacons and can detect beacon loss by itself.
64e29e44 TP	203	*
	204	* As there's possibility that the driver disables PSM before receiving
	205	* BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
	206	*
b771eee5	207	*/
203c903c	208	if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
1a186a51	209	wl1271_info("Beacon loss detected.");
f5fc0f86	210
b771eee5	211	/* indicate to the stack, that beacons have been lost */
19ad0715 JO	212	beacon_loss = true;
	213	}
	214
203c903c	215	if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
19ad0715 JO	216	wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
	217	ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
	218	if (ret < 0)
	219	return ret;
	220	}
	221
203c903c	222	if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
90494a90 JO	223	wl1271_event_pspoll_delivery_fail(wl);
90494a90 JO	224
00236aed JO	225	if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
	226	wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
	227	if (wl->vif)
	228	wl1271_event_rssi_trigger(wl, mbox);
	229	}
	230
d60772f6 JO	231	if (wl->vif && beacon_loss)
d60772f6 JO	232	ieee80211_connection_loss(wl->vif);
f5fc0f86 LC	233
	234	return 0;
	235	}
	236
	237	int wl1271_event_unmask(struct wl1271 *wl)
	238	{
	239	int ret;
	240
	241	ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
	242	if (ret < 0)
	243	return ret;
	244
	245	return 0;
	246	}
	247
	248	void wl1271_event_mbox_config(struct wl1271 *wl)
	249	{
7b048c52	250	wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
f5fc0f86 LC	251	wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
	252
	253	wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
	254	wl->mbox_ptr[0], wl->mbox_ptr[1]);
	255	}
	256
13f2dc52	257	int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
f5fc0f86 LC	258	{
	259	struct event_mailbox mbox;
	260	int ret;
	261
	262	wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
	263
	264	if (mbox_num > 1)
	265	return -EINVAL;
	266
	267	/* first we read the mbox descriptor */
7b048c52 TP	268	wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
7b048c52 TP	269	sizeof(struct event_mailbox), false);
f5fc0f86 LC	270
	271	/* process the descriptor */
	272	ret = wl1271_event_process(wl, &mbox);
	273	if (ret < 0)
	274	return ret;
	275
	276	/* then we let the firmware know it can go on...*/
7b048c52	277	wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
f5fc0f86 LC	278
	279	return 0;
	280	}