308 lines
7.9 KiB
C
308 lines
7.9 KiB
C
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/*
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* This file is part of wl1271
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*
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* Copyright (C) 2009-2010 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/ieee80211.h>
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#include "wl12xx.h"
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#include "cmd.h"
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#include "scan.h"
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#include "acx.h"
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void wl1271_scan_complete_work(struct work_struct *work)
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{
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struct delayed_work *dwork;
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struct wl1271 *wl;
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dwork = container_of(work, struct delayed_work, work);
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wl = container_of(dwork, struct wl1271, scan_complete_work);
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wl1271_debug(DEBUG_SCAN, "Scanning complete");
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mutex_lock(&wl->mutex);
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if (wl->scan.state == WL1271_SCAN_STATE_IDLE) {
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mutex_unlock(&wl->mutex);
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return;
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}
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wl->scan.state = WL1271_SCAN_STATE_IDLE;
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kfree(wl->scan.scanned_ch);
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wl->scan.scanned_ch = NULL;
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wl->scan.req = NULL;
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ieee80211_scan_completed(wl->hw, false);
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if (wl->scan.failed) {
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wl1271_info("Scan completed due to error.");
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ieee80211_queue_work(wl->hw, &wl->recovery_work);
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}
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mutex_unlock(&wl->mutex);
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}
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static int wl1271_get_scan_channels(struct wl1271 *wl,
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struct cfg80211_scan_request *req,
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struct basic_scan_channel_params *channels,
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enum ieee80211_band band, bool passive)
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{
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struct conf_scan_settings *c = &wl->conf.scan;
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int i, j;
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u32 flags;
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for (i = 0, j = 0;
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i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
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i++) {
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flags = req->channels[i]->flags;
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if (!wl->scan.scanned_ch[i] &&
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!(flags & IEEE80211_CHAN_DISABLED) &&
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((!!(flags & IEEE80211_CHAN_PASSIVE_SCAN)) == passive) &&
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(req->channels[i]->band == band)) {
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wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
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req->channels[i]->band,
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req->channels[i]->center_freq);
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wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
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req->channels[i]->hw_value,
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req->channels[i]->flags);
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wl1271_debug(DEBUG_SCAN,
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"max_antenna_gain %d, max_power %d",
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req->channels[i]->max_antenna_gain,
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req->channels[i]->max_power);
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wl1271_debug(DEBUG_SCAN, "beacon_found %d",
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req->channels[i]->beacon_found);
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if (!passive) {
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channels[j].min_duration =
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cpu_to_le32(c->min_dwell_time_active);
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channels[j].max_duration =
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cpu_to_le32(c->max_dwell_time_active);
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} else {
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channels[j].min_duration =
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cpu_to_le32(c->min_dwell_time_passive);
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channels[j].max_duration =
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cpu_to_le32(c->max_dwell_time_passive);
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}
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channels[j].early_termination = 0;
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channels[j].tx_power_att = req->channels[i]->max_power;
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channels[j].channel = req->channels[i]->hw_value;
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memset(&channels[j].bssid_lsb, 0xff, 4);
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memset(&channels[j].bssid_msb, 0xff, 2);
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/* Mark the channels we already used */
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wl->scan.scanned_ch[i] = true;
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j++;
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}
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}
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return j;
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}
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#define WL1271_NOTHING_TO_SCAN 1
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static int wl1271_scan_send(struct wl1271 *wl, enum ieee80211_band band,
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bool passive, u32 basic_rate)
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{
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struct wl1271_cmd_scan *cmd;
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struct wl1271_cmd_trigger_scan_to *trigger;
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int ret;
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u16 scan_options = 0;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
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if (!cmd || !trigger) {
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ret = -ENOMEM;
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goto out;
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}
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/* We always use high priority scans */
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scan_options = WL1271_SCAN_OPT_PRIORITY_HIGH;
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/* No SSIDs means that we have a forced passive scan */
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if (passive || wl->scan.req->n_ssids == 0)
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scan_options |= WL1271_SCAN_OPT_PASSIVE;
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cmd->params.scan_options = cpu_to_le16(scan_options);
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cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
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cmd->channels,
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band, passive);
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if (cmd->params.n_ch == 0) {
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ret = WL1271_NOTHING_TO_SCAN;
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goto out;
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}
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cmd->params.tx_rate = cpu_to_le32(basic_rate);
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cmd->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
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cmd->params.rx_filter_options =
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cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
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cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
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cmd->params.tx_rate = cpu_to_le32(basic_rate);
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cmd->params.tid_trigger = 0;
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cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
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if (band == IEEE80211_BAND_2GHZ)
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cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
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else
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cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
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if (wl->scan.ssid_len && wl->scan.ssid) {
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cmd->params.ssid_len = wl->scan.ssid_len;
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memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
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}
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ret = wl1271_cmd_build_probe_req(wl, wl->scan.ssid, wl->scan.ssid_len,
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wl->scan.req->ie, wl->scan.req->ie_len,
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band);
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if (ret < 0) {
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wl1271_error("PROBE request template failed");
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goto out;
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}
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/* disable the timeout */
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trigger->timeout = 0;
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ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
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sizeof(*trigger), 0);
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if (ret < 0) {
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wl1271_error("trigger scan to failed for hw scan");
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goto out;
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}
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wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
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ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
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if (ret < 0) {
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wl1271_error("SCAN failed");
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goto out;
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}
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out:
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kfree(cmd);
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kfree(trigger);
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return ret;
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}
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void wl1271_scan_stm(struct wl1271 *wl)
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{
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int ret = 0;
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switch (wl->scan.state) {
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case WL1271_SCAN_STATE_IDLE:
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break;
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case WL1271_SCAN_STATE_2GHZ_ACTIVE:
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ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, false,
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wl->conf.tx.basic_rate);
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if (ret == WL1271_NOTHING_TO_SCAN) {
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wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
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wl1271_scan_stm(wl);
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}
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break;
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case WL1271_SCAN_STATE_2GHZ_PASSIVE:
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ret = wl1271_scan_send(wl, IEEE80211_BAND_2GHZ, true,
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wl->conf.tx.basic_rate);
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if (ret == WL1271_NOTHING_TO_SCAN) {
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if (wl->enable_11a)
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wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
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else
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wl->scan.state = WL1271_SCAN_STATE_DONE;
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wl1271_scan_stm(wl);
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}
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break;
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case WL1271_SCAN_STATE_5GHZ_ACTIVE:
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ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, false,
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wl->conf.tx.basic_rate_5);
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if (ret == WL1271_NOTHING_TO_SCAN) {
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wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
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wl1271_scan_stm(wl);
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}
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break;
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case WL1271_SCAN_STATE_5GHZ_PASSIVE:
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ret = wl1271_scan_send(wl, IEEE80211_BAND_5GHZ, true,
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wl->conf.tx.basic_rate_5);
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if (ret == WL1271_NOTHING_TO_SCAN) {
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wl->scan.state = WL1271_SCAN_STATE_DONE;
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wl1271_scan_stm(wl);
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}
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break;
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case WL1271_SCAN_STATE_DONE:
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wl->scan.failed = false;
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cancel_delayed_work(&wl->scan_complete_work);
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ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
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msecs_to_jiffies(0));
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break;
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default:
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wl1271_error("invalid scan state");
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break;
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}
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if (ret < 0) {
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cancel_delayed_work(&wl->scan_complete_work);
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ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
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msecs_to_jiffies(0));
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}
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}
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int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
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struct cfg80211_scan_request *req)
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{
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if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
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return -EBUSY;
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wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
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if (ssid_len && ssid) {
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wl->scan.ssid_len = ssid_len;
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memcpy(wl->scan.ssid, ssid, ssid_len);
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} else {
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wl->scan.ssid_len = 0;
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}
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wl->scan.req = req;
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wl->scan.scanned_ch = kcalloc(req->n_channels,
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sizeof(*wl->scan.scanned_ch),
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GFP_KERNEL);
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/* we assume failure so that timeout scenarios are handled correctly */
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wl->scan.failed = true;
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ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
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msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
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wl1271_scan_stm(wl);
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return 0;
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}
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