drivers/net/wireless/wl12xx/scan.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * 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"
 #include "ps.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->state == WL1271_STATE_OFF)
 		goto out;

 	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
 		goto out;

 	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)) {
 		if (wl1271_ps_elp_wakeup(wl) == 0) {
 			wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
 			wl1271_ps_elp_sleep(wl);
 		}
 	}

 	if (wl->scan.failed) {
 		wl1271_info("Scan completed due to error.");
 		ieee80211_queue_work(wl->hw, &wl->recovery_work);
 	}

 out:
 	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;
 }
	/*
	* 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"
	#include "ps.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->state == WL1271_STATE_OFF)
	goto out;

	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
	goto out;

	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)) {
	if (wl1271_ps_elp_wakeup(wl) == 0) {
	wl1271_cmd_build_ap_probe_req(wl, wl->probereq);
	wl1271_ps_elp_sleep(wl);
	}
	}

	if (wl->scan.failed) {
	wl1271_info("Scan completed due to error.");
	ieee80211_queue_work(wl->hw, &wl->recovery_work);
	}

	out:
	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;
	}