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// SPDX-License-Identifier: GPL-2.0-only
/*
* Scan related functions.
*
* Copyright (c) 2017-2019, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
*/
#include <net/mac80211.h>
#include "scan.h"
#include "wfx.h"
#include "sta.h"
#include "hif_tx_mib.h"
static void __ieee80211_scan_completed_compat(struct ieee80211_hw *hw,
bool aborted)
{
struct cfg80211_scan_info info = {
.aborted = aborted,
};
ieee80211_scan_completed(hw, &info);
}
static int update_probe_tmpl(struct wfx_vif *wvif,
struct cfg80211_scan_request *req)
{
struct sk_buff *skb;
skb = ieee80211_probereq_get(wvif->wdev->hw, wvif->vif->addr,
NULL, 0, req->ie_len);
if (!skb)
return -ENOMEM;
skb_put_data(skb, req->ie, req->ie_len);
hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBREQ, 0);
dev_kfree_skb(skb);
return 0;
}
static int send_scan_req(struct wfx_vif *wvif,
struct cfg80211_scan_request *req, int start_idx)
{
int i, ret, timeout;
struct ieee80211_channel *ch_start, *ch_cur;
for (i = start_idx; i < req->n_channels; i++) {
ch_start = req->channels[start_idx];
ch_cur = req->channels[i];
WARN(ch_cur->band != NL80211_BAND_2GHZ, "band not supported");
if (ch_cur->max_power != ch_start->max_power)
break;
if ((ch_cur->flags ^ ch_start->flags) & IEEE80211_CHAN_NO_IR)
break;
}
wfx_tx_lock_flush(wvif->wdev);
wvif->scan_abort = false;
reinit_completion(&wvif->scan_complete);
timeout = hif_scan(wvif, req, start_idx, i - start_idx);
if (timeout < 0)
return timeout;
ret = wait_for_completion_timeout(&wvif->scan_complete, timeout);
if (req->channels[start_idx]->max_power != wvif->vif->bss_conf.txpower)
hif_set_output_power(wvif, wvif->vif->bss_conf.txpower);
wfx_tx_unlock(wvif->wdev);
if (!ret) {
dev_notice(wvif->wdev->dev, "scan timeout\n");
hif_stop_scan(wvif);
return -ETIMEDOUT;
}
if (wvif->scan_abort) {
dev_notice(wvif->wdev->dev, "scan abort\n");
return -ECONNABORTED;
}
return i - start_idx;
}
/*
* It is not really necessary to run scan request asynchronously. However,
* there is a bug in "iw scan" when ieee80211_scan_completed() is called before
* wfx_hw_scan() return
*/
void wfx_hw_scan_work(struct work_struct *work)
{
struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan_work);
struct ieee80211_scan_request *hw_req = wvif->scan_req;
int chan_cur, ret;
mutex_lock(&wvif->scan_lock);
mutex_lock(&wvif->wdev->conf_mutex);
update_probe_tmpl(wvif, &hw_req->req);
wfx_fwd_probe_req(wvif, true);
chan_cur = 0;
do {
ret = send_scan_req(wvif, &hw_req->req, chan_cur);
if (ret > 0)
chan_cur += ret;
} while (ret > 0 && chan_cur < hw_req->req.n_channels);
mutex_unlock(&wvif->wdev->conf_mutex);
mutex_unlock(&wvif->scan_lock);
__ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
}
int wfx_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct ieee80211_scan_request *hw_req)
{
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
WARN_ON(hw_req->req.n_channels > HIF_API_MAX_NB_CHANNELS);
if (vif->type == NL80211_IFTYPE_AP)
return -EOPNOTSUPP;
if (wvif->state == WFX_STATE_PRE_STA)
return -EBUSY;
wvif->scan_req = hw_req;
schedule_work(&wvif->scan_work);
return 0;
}
void wfx_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
wvif->scan_abort = true;
hif_stop_scan(wvif);
}
void wfx_scan_complete(struct wfx_vif *wvif)
{
complete(&wvif->scan_complete);
}
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