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linux/drivers/net/wireless/wl12xx/scan.c

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/*
* This file is part of wl1271
*
* Copyright (C) 2009-2010 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 <linux/ieee80211.h>
#include "wl12xx.h"
#include "cmd.h"
#include "scan.h"
#include "acx.h"
void wl1271_scan_complete_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, scan_complete_work);
wl1271_debug(DEBUG_SCAN, "Scanning complete");
mutex_lock(&wl->mutex);
if (wl->scan.state == WL1271_SCAN_STATE_IDLE) {
mutex_unlock(&wl->mutex);
return;
}
wl->scan.state = WL1271_SCAN_STATE_IDLE;
kfree(wl->scan.scanned_ch);
wl->scan.scanned_ch = NULL;
wl->scan.req = NULL;
ieee80211_scan_completed(wl->hw, false);
/* restore hardware connection monitoring template */
if (test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
if (wl->scan.failed) {
wl1271_info("Scan completed due to error.");
ieee80211_queue_work(wl->hw, &wl->recovery_work);
}
mutex_unlock(&wl->mutex);
}
static int wl1271_get_scan_channels(struct wl1271 *wl,
struct cfg80211_scan_request *req,
struct basic_scan_channel_params *channels,
enum ieee80211_band band, bool passive)
{
struct conf_scan_settings *c = &wl->conf.scan;
int i, j;
u32 flags;
for (i = 0, j = 0;
i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
i++) {
flags = req->channels[i]->flags;
if (!wl->scan.scanned_ch[i] &&
!(flags & IEEE80211_CHAN_DISABLED) &&
((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
(req->channels[i]->band == band)) {
wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
req->channels[i]->band,
req->channels[i]->center_freq);
wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
req->channels[i]->hw_value,
req->channels[i]->flags);
wl1271_debug(DEBUG_SCAN,
"max_antenna_gain %d, max_power %d",
req->channels[i]->max_antenna_gain,
req->channels[i]->max_power);
wl1271_debug(DEBUG_SCAN, "beacon_found %d",
req->channels[i]->beacon_found);
if (!passive) {
channels[j].min_duration =
cpu_to_le32(c->min_dwell_time_active);
channels[j].max_duration =
cpu_to_le32(c->max_dwell_time_active);
} else {
channels[j].min_duration =
cpu_to_le32(c->min_dwell_time_passive);
channels[j].max_duration =
cpu_to_le32(c->max_dwell_time_passive);
}
channels[j].early_termination = 0;
channels[j].tx_power_att = req->channels[i]->max_power;
channels[j].channel = req->channels[i]->hw_value;
memset(&channels[j].bssid_lsb, 0xff, 4);
memset(&channels[j].bssid_msb, 0xff, 2);
/* Mark the channels we already used */
wl->scan.scanned_ch[i] = true;
j++;
}
}
return j;
}
#define WL1271_NOTHING_TO_SCAN 1
static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
bool passive, u32 basic_rate)
{
struct wl1271_cmd_scan *cmd;
struct wl1271_cmd_trigger_scan_to *trigger;
int ret;
u16 scan_options = 0;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
if (!cmd || !trigger) {
ret = -ENOMEM;
goto out;
}
/* We always use high priority scans */
scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
/* No SSIDs means that we have a forced passive scan */
if (passive || wl->scan.req->n_ssids == 0)
scan_options |= WL1271_SCAN_OPT_PASSIVE;
cmd->params.scan_options = cpu_to_le16(scan_options);
cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
cmd->channels,
band, passive);
if (cmd->params.n_ch == 0) {
ret = WL1271_NOTHING_TO_SCAN;
goto out;
}
cmd->params.tx_rate = cpu_to_le32(basic_rate);
cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
cmd->params.rx_filter_options =
cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
cmd->params.tx_rate = cpu_to_le32(basic_rate);
cmd->params.tid_trigger = 0;
cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
if (band == IEEE80211_BAND_2GHZ)
cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
else
cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
if (wl->scan.ssid_len && wl->scan.ssid) {
cmd->params.ssid_len = wl->scan.ssid_len;
memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
}
ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
wl->scan.req->ie, wl->scan.req->ie_len,
band);
if (ret < 0) {
wl1271_error("PROBE request template failed");
goto out;
}
/* disable the timeout */
trigger->timeout = 0;
ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
sizeof(*trigger), 0);
if (ret < 0) {
wl1271_error("trigger scan to failed for hw scan");
goto out;
}
wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
if (ret < 0) {
wl1271_error("SCAN failed");
goto out;
}
out:
kfree(cmd);
kfree(trigger);
return ret;
}
void wl1271_scan_stm(struct wl1271 *wl)
{
int ret = 0;
switch (wl->scan.state) {
case WL1271_SCAN_STATE_IDLE:
break;
case WL1271_SCAN_STATE_2GHZ_ACTIVE:
ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
wl->conf.tx.basic_rate);
if (ret == WL1271_NOTHING_TO_SCAN) {
wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
wl1271_scan_stm(wl);
}
break;
case WL1271_SCAN_STATE_2GHZ_PASSIVE:
ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
wl->conf.tx.basic_rate);
if (ret == WL1271_NOTHING_TO_SCAN) {
if (wl->enable_11a)
wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
else
wl->scan.state = WL1271_SCAN_STATE_DONE;
wl1271_scan_stm(wl);
}
break;
case WL1271_SCAN_STATE_5GHZ_ACTIVE:
ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
wl->conf.tx.basic_rate_5);
if (ret == WL1271_NOTHING_TO_SCAN) {
wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
wl1271_scan_stm(wl);
}
break;
case WL1271_SCAN_STATE_5GHZ_PASSIVE:
ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
wl->conf.tx.basic_rate_5);
if (ret == WL1271_NOTHING_TO_SCAN) {
wl->scan.state = WL1271_SCAN_STATE_DONE;
wl1271_scan_stm(wl);
}
break;
case WL1271_SCAN_STATE_DONE:
wl->scan.failed = false;
cancel_delayed_work(&wl->scan_complete_work);
ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
msecs_to_jiffies(0));
break;
default:
wl1271_error("invalid scan state");
break;
}
if (ret < 0) {
cancel_delayed_work(&wl->scan_complete_work);
ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
msecs_to_jiffies(0));
}
}
int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
struct cfg80211_scan_request *req)
{
if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
return -EBUSY;
wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
if (ssid_len && ssid) {
wl->scan.ssid_len = ssid_len;
memcpy(wl->scan.ssid, ssid, ssid_len);
} else {
wl->scan.ssid_len = 0;
}
wl->scan.req = req;
wl->scan.scanned_ch = kcalloc(req->n_channels,
sizeof(*wl->scan.scanned_ch),
GFP_KERNEL);
/* we assume failure so that timeout scenarios are handled correctly */
wl->scan.failed = true;
ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
wl1271_scan_stm(wl);
return 0;
}
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