blob: 71e9b91cf15bcea42ab10ade66578a591dd65e2d [file] [log] [blame]
/*
* Scan implementation for ST-Ericsson CW1200 mac80211 drivers
*
* Copyright (c) 2010, ST-Ericsson
* Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
*
* 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.
*/
#include <linux/sched.h>
#include "cw1200.h"
#include "scan.h"
#include "sta.h"
#include "pm.h"
static void cw1200_scan_restart_delayed(struct cw1200_common *priv);
static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan)
{
int ret, i;
int tmo = 2000;
switch (priv->join_status) {
case CW1200_JOIN_STATUS_PRE_STA:
case CW1200_JOIN_STATUS_JOINING:
return -EBUSY;
default:
break;
}
wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n",
scan->type, scan->num_channels, scan->flags);
for (i = 0; i < scan->num_channels; ++i)
tmo += scan->ch[i].max_chan_time + 10;
cancel_delayed_work_sync(&priv->clear_recent_scan_work);
atomic_set(&priv->scan.in_progress, 1);
atomic_set(&priv->recent_scan, 1);
cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo));
queue_delayed_work(priv->workqueue, &priv->scan.timeout,
msecs_to_jiffies(tmo));
ret = wsm_scan(priv, scan);
if (ret) {
atomic_set(&priv->scan.in_progress, 0);
cancel_delayed_work_sync(&priv->scan.timeout);
cw1200_scan_restart_delayed(priv);
}
return ret;
}
int cw1200_hw_scan(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_scan_request *hw_req)
{
struct cw1200_common *priv = hw->priv;
struct cfg80211_scan_request *req = &hw_req->req;
struct wsm_template_frame frame = {
.frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
};
int i, ret;
if (!priv->vif)
return -EINVAL;
/* Scan when P2P_GO corrupt firmware MiniAP mode */
if (priv->join_status == CW1200_JOIN_STATUS_AP)
return -EOPNOTSUPP;
if (req->n_ssids == 1 && !req->ssids[0].ssid_len)
req->n_ssids = 0;
wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n",
req->n_ssids);
if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS)
return -EINVAL;
/* will be unlocked in cw1200_scan_work() */
down(&priv->scan.lock);
mutex_lock(&priv->conf_mutex);
frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0,
req->ie_len);
if (!frame.skb) {
mutex_unlock(&priv->conf_mutex);
up(&priv->scan.lock);
return -ENOMEM;
}
if (req->ie_len)
skb_put_data(frame.skb, req->ie, req->ie_len);
ret = wsm_set_template_frame(priv, &frame);
if (!ret) {
/* Host want to be the probe responder. */
ret = wsm_set_probe_responder(priv, true);
}
if (ret) {
dev_kfree_skb(frame.skb);
mutex_unlock(&priv->conf_mutex);
up(&priv->scan.lock);
return ret;
}
wsm_lock_tx(priv);
BUG_ON(priv->scan.req);
priv->scan.req = req;
priv->scan.n_ssids = 0;
priv->scan.status = 0;
priv->scan.begin = &req->channels[0];
priv->scan.curr = priv->scan.begin;
priv->scan.end = &req->channels[req->n_channels];
priv->scan.output_power = priv->output_power;
for (i = 0; i < req->n_ssids; ++i) {
struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids];
memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid));
dst->length = req->ssids[i].ssid_len;
++priv->scan.n_ssids;
}
if (frame.skb)
dev_kfree_skb(frame.skb);
mutex_unlock(&priv->conf_mutex);
queue_work(priv->workqueue, &priv->scan.work);
return 0;
}
void cw1200_scan_work(struct work_struct *work)
{
struct cw1200_common *priv = container_of(work, struct cw1200_common,
scan.work);
struct ieee80211_channel **it;
struct wsm_scan scan = {
.type = WSM_SCAN_TYPE_FOREGROUND,
.flags = WSM_SCAN_FLAG_SPLIT_METHOD,
};
bool first_run = (priv->scan.begin == priv->scan.curr &&
priv->scan.begin != priv->scan.end);
int i;
if (first_run) {
/* Firmware gets crazy if scan request is sent
* when STA is joined but not yet associated.
* Force unjoin in this case.
*/
if (cancel_delayed_work_sync(&priv->join_timeout) > 0)
cw1200_join_timeout(&priv->join_timeout.work);
}
mutex_lock(&priv->conf_mutex);
if (first_run) {
if (priv->join_status == CW1200_JOIN_STATUS_STA &&
!(priv->powersave_mode.mode & WSM_PSM_PS)) {
struct wsm_set_pm pm = priv->powersave_mode;
pm.mode = WSM_PSM_PS;
cw1200_set_pm(priv, &pm);
} else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
/* FW bug: driver has to restart p2p-dev mode
* after scan
*/
cw1200_disable_listening(priv);
}
}
if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) {
struct cfg80211_scan_info info = {
.aborted = priv->scan.status ? 1 : 0,
};
if (priv->scan.output_power != priv->output_power)
wsm_set_output_power(priv, priv->output_power * 10);
if (priv->join_status == CW1200_JOIN_STATUS_STA &&
!(priv->powersave_mode.mode & WSM_PSM_PS))
cw1200_set_pm(priv, &priv->powersave_mode);
if (priv->scan.status < 0)
wiphy_warn(priv->hw->wiphy,
"[SCAN] Scan failed (%d).\n",
priv->scan.status);
else if (priv->scan.req)
wiphy_dbg(priv->hw->wiphy,
"[SCAN] Scan completed.\n");
else
wiphy_dbg(priv->hw->wiphy,
"[SCAN] Scan canceled.\n");
priv->scan.req = NULL;
cw1200_scan_restart_delayed(priv);
wsm_unlock_tx(priv);
mutex_unlock(&priv->conf_mutex);
ieee80211_scan_completed(priv->hw, &info);
up(&priv->scan.lock);
return;
} else {
struct ieee80211_channel *first = *priv->scan.curr;
for (it = priv->scan.curr + 1, i = 1;
it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS;
++it, ++i) {
if ((*it)->band != first->band)
break;
if (((*it)->flags ^ first->flags) &
IEEE80211_CHAN_NO_IR)
break;
if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
(*it)->max_power != first->max_power)
break;
}
scan.band = first->band;
if (priv->scan.req->no_cck)
scan.max_tx_rate = WSM_TRANSMIT_RATE_6;
else
scan.max_tx_rate = WSM_TRANSMIT_RATE_1;
scan.num_probes =
(first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2;
scan.num_ssids = priv->scan.n_ssids;
scan.ssids = &priv->scan.ssids[0];
scan.num_channels = it - priv->scan.curr;
/* TODO: Is it optimal? */
scan.probe_delay = 100;
/* It is not stated in WSM specification, however
* FW team says that driver may not use FG scan
* when joined.
*/
if (priv->join_status == CW1200_JOIN_STATUS_STA) {
scan.type = WSM_SCAN_TYPE_BACKGROUND;
scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
}
scan.ch = kcalloc(it - priv->scan.curr,
sizeof(struct wsm_scan_ch),
GFP_KERNEL);
if (!scan.ch) {
priv->scan.status = -ENOMEM;
goto fail;
}
for (i = 0; i < scan.num_channels; ++i) {
scan.ch[i].number = priv->scan.curr[i]->hw_value;
if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) {
scan.ch[i].min_chan_time = 50;
scan.ch[i].max_chan_time = 100;
} else {
scan.ch[i].min_chan_time = 10;
scan.ch[i].max_chan_time = 25;
}
}
if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
priv->scan.output_power != first->max_power) {
priv->scan.output_power = first->max_power;
wsm_set_output_power(priv,
priv->scan.output_power * 10);
}
priv->scan.status = cw1200_scan_start(priv, &scan);
kfree(scan.ch);
if (priv->scan.status)
goto fail;
priv->scan.curr = it;
}
mutex_unlock(&priv->conf_mutex);
return;
fail:
priv->scan.curr = priv->scan.end;
mutex_unlock(&priv->conf_mutex);
queue_work(priv->workqueue, &priv->scan.work);
return;
}
static void cw1200_scan_restart_delayed(struct cw1200_common *priv)
{
/* FW bug: driver has to restart p2p-dev mode after scan. */
if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
cw1200_enable_listening(priv);
cw1200_update_filtering(priv);
}
if (priv->delayed_unjoin) {
priv->delayed_unjoin = false;
if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0)
wsm_unlock_tx(priv);
} else if (priv->delayed_link_loss) {
wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n");
priv->delayed_link_loss = 0;
cw1200_cqm_bssloss_sm(priv, 1, 0, 0);
}
}
static void cw1200_scan_complete(struct cw1200_common *priv)
{
queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ);
if (priv->scan.direct_probe) {
wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n");
cw1200_scan_restart_delayed(priv);
priv->scan.direct_probe = 0;
up(&priv->scan.lock);
wsm_unlock_tx(priv);
} else {
cw1200_scan_work(&priv->scan.work);
}
}
void cw1200_scan_failed_cb(struct cw1200_common *priv)
{
if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
/* STA is stopped. */
return;
if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
priv->scan.status = -EIO;
queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
}
}
void cw1200_scan_complete_cb(struct cw1200_common *priv,
struct wsm_scan_complete *arg)
{
if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
/* STA is stopped. */
return;
if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
priv->scan.status = 1;
queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
}
}
void cw1200_clear_recent_scan_work(struct work_struct *work)
{
struct cw1200_common *priv =
container_of(work, struct cw1200_common,
clear_recent_scan_work.work);
atomic_xchg(&priv->recent_scan, 0);
}
void cw1200_scan_timeout(struct work_struct *work)
{
struct cw1200_common *priv =
container_of(work, struct cw1200_common, scan.timeout.work);
if (atomic_xchg(&priv->scan.in_progress, 0)) {
if (priv->scan.status > 0) {
priv->scan.status = 0;
} else if (!priv->scan.status) {
wiphy_warn(priv->hw->wiphy,
"Timeout waiting for scan complete notification.\n");
priv->scan.status = -ETIMEDOUT;
priv->scan.curr = priv->scan.end;
wsm_stop_scan(priv);
}
cw1200_scan_complete(priv);
}
}
void cw1200_probe_work(struct work_struct *work)
{
struct cw1200_common *priv =
container_of(work, struct cw1200_common, scan.probe_work.work);
u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id);
struct cw1200_queue *queue = &priv->tx_queue[queue_id];
const struct cw1200_txpriv *txpriv;
struct wsm_tx *wsm;
struct wsm_template_frame frame = {
.frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
};
struct wsm_ssid ssids[1] = {{
.length = 0,
} };
struct wsm_scan_ch ch[1] = {{
.min_chan_time = 0,
.max_chan_time = 10,
} };
struct wsm_scan scan = {
.type = WSM_SCAN_TYPE_FOREGROUND,
.num_probes = 1,
.probe_delay = 0,
.num_channels = 1,
.ssids = ssids,
.ch = ch,
};
u8 *ies;
size_t ies_len;
int ret;
wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n");
mutex_lock(&priv->conf_mutex);
if (down_trylock(&priv->scan.lock)) {
/* Scan is already in progress. Requeue self. */
schedule();
queue_delayed_work(priv->workqueue, &priv->scan.probe_work,
msecs_to_jiffies(100));
mutex_unlock(&priv->conf_mutex);
return;
}
/* Make sure we still have a pending probe req */
if (cw1200_queue_get_skb(queue, priv->pending_frame_id,
&frame.skb, &txpriv)) {
up(&priv->scan.lock);
mutex_unlock(&priv->conf_mutex);
wsm_unlock_tx(priv);
return;
}
wsm = (struct wsm_tx *)frame.skb->data;
scan.max_tx_rate = wsm->max_tx_rate;
scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ?
WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G;
if (priv->join_status == CW1200_JOIN_STATUS_STA ||
priv->join_status == CW1200_JOIN_STATUS_IBSS) {
scan.type = WSM_SCAN_TYPE_BACKGROUND;
scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
}
ch[0].number = priv->channel->hw_value;
skb_pull(frame.skb, txpriv->offset);
ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)];
ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr);
if (ies_len) {
u8 *ssidie =
(u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len);
if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) {
u8 *nextie = &ssidie[2 + ssidie[1]];
/* Remove SSID from the IE list. It has to be provided
* as a separate argument in cw1200_scan_start call
*/
/* Store SSID localy */
ssids[0].length = ssidie[1];
memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length);
scan.num_ssids = 1;
/* Remove SSID from IE list */
ssidie[1] = 0;
memmove(&ssidie[2], nextie, &ies[ies_len] - nextie);
skb_trim(frame.skb, frame.skb->len - ssids[0].length);
}
}
/* FW bug: driver has to restart p2p-dev mode after scan */
if (priv->join_status == CW1200_JOIN_STATUS_MONITOR)
cw1200_disable_listening(priv);
ret = wsm_set_template_frame(priv, &frame);
priv->scan.direct_probe = 1;
if (!ret) {
wsm_flush_tx(priv);
ret = cw1200_scan_start(priv, &scan);
}
mutex_unlock(&priv->conf_mutex);
skb_push(frame.skb, txpriv->offset);
if (!ret)
IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK;
BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id));
if (ret) {
priv->scan.direct_probe = 0;
up(&priv->scan.lock);
wsm_unlock_tx(priv);
}
return;
}