summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlegacy/iwl-scan.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wireless/iwlegacy/iwl-scan.c')
-rw-r--r--drivers/net/wireless/iwlegacy/iwl-scan.c550
1 files changed, 0 insertions, 550 deletions
diff --git a/drivers/net/wireless/iwlegacy/iwl-scan.c b/drivers/net/wireless/iwlegacy/iwl-scan.c
deleted file mode 100644
index 521b73b527d3..000000000000
--- a/drivers/net/wireless/iwlegacy/iwl-scan.c
+++ /dev/null
@@ -1,550 +0,0 @@
-/******************************************************************************
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License 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 Street, Fifth Floor, Boston, MA 02110,
- * USA
- *
- * The full GNU General Public License is included in this distribution
- * in the file called LICENSE.GPL.
- *
- * Contact Information:
- * Intel Linux Wireless <ilw@linux.intel.com>
- * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
- *****************************************************************************/
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/etherdevice.h>
-#include <linux/export.h>
-#include <net/mac80211.h>
-
-#include "iwl-eeprom.h"
-#include "iwl-dev.h"
-#include "iwl-core.h"
-#include "iwl-sta.h"
-#include "iwl-io.h"
-#include "iwl-helpers.h"
-
-/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
- * sending probe req. This should be set long enough to hear probe responses
- * from more than one AP. */
-#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
-#define IWL_ACTIVE_DWELL_TIME_52 (20)
-
-#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
-#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
-
-/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
- * Must be set longer than active dwell time.
- * For the most reliable scan, set > AP beacon interval (typically 100msec). */
-#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
-#define IWL_PASSIVE_DWELL_TIME_52 (10)
-#define IWL_PASSIVE_DWELL_BASE (100)
-#define IWL_CHANNEL_TUNE_TIME 5
-
-static int iwl_legacy_send_scan_abort(struct iwl_priv *priv)
-{
- int ret;
- struct iwl_rx_packet *pkt;
- struct iwl_host_cmd cmd = {
- .id = REPLY_SCAN_ABORT_CMD,
- .flags = CMD_WANT_SKB,
- };
-
- /* Exit instantly with error when device is not ready
- * to receive scan abort command or it does not perform
- * hardware scan currently */
- if (!test_bit(STATUS_READY, &priv->status) ||
- !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
- !test_bit(STATUS_SCAN_HW, &priv->status) ||
- test_bit(STATUS_FW_ERROR, &priv->status) ||
- test_bit(STATUS_EXIT_PENDING, &priv->status))
- return -EIO;
-
- ret = iwl_legacy_send_cmd_sync(priv, &cmd);
- if (ret)
- return ret;
-
- pkt = (struct iwl_rx_packet *)cmd.reply_page;
- if (pkt->u.status != CAN_ABORT_STATUS) {
- /* The scan abort will return 1 for success or
- * 2 for "failure". A failure condition can be
- * due to simply not being in an active scan which
- * can occur if we send the scan abort before we
- * the microcode has notified us that a scan is
- * completed. */
- IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
- ret = -EIO;
- }
-
- iwl_legacy_free_pages(priv, cmd.reply_page);
- return ret;
-}
-
-static void iwl_legacy_complete_scan(struct iwl_priv *priv, bool aborted)
-{
- /* check if scan was requested from mac80211 */
- if (priv->scan_request) {
- IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
- ieee80211_scan_completed(priv->hw, aborted);
- }
-
- priv->scan_vif = NULL;
- priv->scan_request = NULL;
-}
-
-void iwl_legacy_force_scan_end(struct iwl_priv *priv)
-{
- lockdep_assert_held(&priv->mutex);
-
- if (!test_bit(STATUS_SCANNING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
- return;
- }
-
- IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
- clear_bit(STATUS_SCANNING, &priv->status);
- clear_bit(STATUS_SCAN_HW, &priv->status);
- clear_bit(STATUS_SCAN_ABORTING, &priv->status);
- iwl_legacy_complete_scan(priv, true);
-}
-
-static void iwl_legacy_do_scan_abort(struct iwl_priv *priv)
-{
- int ret;
-
- lockdep_assert_held(&priv->mutex);
-
- if (!test_bit(STATUS_SCANNING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
- return;
- }
-
- if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
- return;
- }
-
- ret = iwl_legacy_send_scan_abort(priv);
- if (ret) {
- IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
- iwl_legacy_force_scan_end(priv);
- } else
- IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
-}
-
-/**
- * iwl_scan_cancel - Cancel any currently executing HW scan
- */
-int iwl_legacy_scan_cancel(struct iwl_priv *priv)
-{
- IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
- queue_work(priv->workqueue, &priv->abort_scan);
- return 0;
-}
-EXPORT_SYMBOL(iwl_legacy_scan_cancel);
-
-/**
- * iwl_legacy_scan_cancel_timeout - Cancel any currently executing HW scan
- * @ms: amount of time to wait (in milliseconds) for scan to abort
- *
- */
-int iwl_legacy_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
-{
- unsigned long timeout = jiffies + msecs_to_jiffies(ms);
-
- lockdep_assert_held(&priv->mutex);
-
- IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
-
- iwl_legacy_do_scan_abort(priv);
-
- while (time_before_eq(jiffies, timeout)) {
- if (!test_bit(STATUS_SCAN_HW, &priv->status))
- break;
- msleep(20);
- }
-
- return test_bit(STATUS_SCAN_HW, &priv->status);
-}
-EXPORT_SYMBOL(iwl_legacy_scan_cancel_timeout);
-
-/* Service response to REPLY_SCAN_CMD (0x80) */
-static void iwl_legacy_rx_reply_scan(struct iwl_priv *priv,
- struct iwl_rx_mem_buffer *rxb)
-{
-#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
- struct iwl_rx_packet *pkt = rxb_addr(rxb);
- struct iwl_scanreq_notification *notif =
- (struct iwl_scanreq_notification *)pkt->u.raw;
-
- IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
-#endif
-}
-
-/* Service SCAN_START_NOTIFICATION (0x82) */
-static void iwl_legacy_rx_scan_start_notif(struct iwl_priv *priv,
- struct iwl_rx_mem_buffer *rxb)
-{
- struct iwl_rx_packet *pkt = rxb_addr(rxb);
- struct iwl_scanstart_notification *notif =
- (struct iwl_scanstart_notification *)pkt->u.raw;
- priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
- IWL_DEBUG_SCAN(priv, "Scan start: "
- "%d [802.11%s] "
- "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
- notif->channel,
- notif->band ? "bg" : "a",
- le32_to_cpu(notif->tsf_high),
- le32_to_cpu(notif->tsf_low),
- notif->status, notif->beacon_timer);
-}
-
-/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
-static void iwl_legacy_rx_scan_results_notif(struct iwl_priv *priv,
- struct iwl_rx_mem_buffer *rxb)
-{
-#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
- struct iwl_rx_packet *pkt = rxb_addr(rxb);
- struct iwl_scanresults_notification *notif =
- (struct iwl_scanresults_notification *)pkt->u.raw;
-
- IWL_DEBUG_SCAN(priv, "Scan ch.res: "
- "%d [802.11%s] "
- "(TSF: 0x%08X:%08X) - %d "
- "elapsed=%lu usec\n",
- notif->channel,
- notif->band ? "bg" : "a",
- le32_to_cpu(notif->tsf_high),
- le32_to_cpu(notif->tsf_low),
- le32_to_cpu(notif->statistics[0]),
- le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
-#endif
-}
-
-/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
-static void iwl_legacy_rx_scan_complete_notif(struct iwl_priv *priv,
- struct iwl_rx_mem_buffer *rxb)
-{
-
-#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
- struct iwl_rx_packet *pkt = rxb_addr(rxb);
- struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
-#endif
-
- IWL_DEBUG_SCAN(priv,
- "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
- scan_notif->scanned_channels,
- scan_notif->tsf_low,
- scan_notif->tsf_high, scan_notif->status);
-
- /* The HW is no longer scanning */
- clear_bit(STATUS_SCAN_HW, &priv->status);
-
- IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
- (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
- jiffies_to_msecs(jiffies - priv->scan_start));
-
- queue_work(priv->workqueue, &priv->scan_completed);
-}
-
-void iwl_legacy_setup_rx_scan_handlers(struct iwl_priv *priv)
-{
- /* scan handlers */
- priv->rx_handlers[REPLY_SCAN_CMD] = iwl_legacy_rx_reply_scan;
- priv->rx_handlers[SCAN_START_NOTIFICATION] =
- iwl_legacy_rx_scan_start_notif;
- priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
- iwl_legacy_rx_scan_results_notif;
- priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
- iwl_legacy_rx_scan_complete_notif;
-}
-EXPORT_SYMBOL(iwl_legacy_setup_rx_scan_handlers);
-
-inline u16 iwl_legacy_get_active_dwell_time(struct iwl_priv *priv,
- enum ieee80211_band band,
- u8 n_probes)
-{
- if (band == IEEE80211_BAND_5GHZ)
- return IWL_ACTIVE_DWELL_TIME_52 +
- IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
- else
- return IWL_ACTIVE_DWELL_TIME_24 +
- IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
-}
-EXPORT_SYMBOL(iwl_legacy_get_active_dwell_time);
-
-u16 iwl_legacy_get_passive_dwell_time(struct iwl_priv *priv,
- enum ieee80211_band band,
- struct ieee80211_vif *vif)
-{
- struct iwl_rxon_context *ctx;
- u16 passive = (band == IEEE80211_BAND_2GHZ) ?
- IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
- IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
-
- if (iwl_legacy_is_any_associated(priv)) {
- /*
- * If we're associated, we clamp the maximum passive
- * dwell time to be 98% of the smallest beacon interval
- * (minus 2 * channel tune time)
- */
- for_each_context(priv, ctx) {
- u16 value;
-
- if (!iwl_legacy_is_associated_ctx(ctx))
- continue;
- value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
- if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
- value = IWL_PASSIVE_DWELL_BASE;
- value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
- passive = min(value, passive);
- }
- }
-
- return passive;
-}
-EXPORT_SYMBOL(iwl_legacy_get_passive_dwell_time);
-
-void iwl_legacy_init_scan_params(struct iwl_priv *priv)
-{
- u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
- if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
- priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
- if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
- priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
-}
-EXPORT_SYMBOL(iwl_legacy_init_scan_params);
-
-static int iwl_legacy_scan_initiate(struct iwl_priv *priv,
- struct ieee80211_vif *vif)
-{
- int ret;
-
- lockdep_assert_held(&priv->mutex);
-
- if (WARN_ON(!priv->cfg->ops->utils->request_scan))
- return -EOPNOTSUPP;
-
- cancel_delayed_work(&priv->scan_check);
-
- if (!iwl_legacy_is_ready_rf(priv)) {
- IWL_WARN(priv, "Request scan called when driver not ready.\n");
- return -EIO;
- }
-
- if (test_bit(STATUS_SCAN_HW, &priv->status)) {
- IWL_DEBUG_SCAN(priv,
- "Multiple concurrent scan requests in parallel.\n");
- return -EBUSY;
- }
-
- if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
- return -EBUSY;
- }
-
- IWL_DEBUG_SCAN(priv, "Starting scan...\n");
-
- set_bit(STATUS_SCANNING, &priv->status);
- priv->scan_start = jiffies;
-
- ret = priv->cfg->ops->utils->request_scan(priv, vif);
- if (ret) {
- clear_bit(STATUS_SCANNING, &priv->status);
- return ret;
- }
-
- queue_delayed_work(priv->workqueue, &priv->scan_check,
- IWL_SCAN_CHECK_WATCHDOG);
-
- return 0;
-}
-
-int iwl_legacy_mac_hw_scan(struct ieee80211_hw *hw,
- struct ieee80211_vif *vif,
- struct cfg80211_scan_request *req)
-{
- struct iwl_priv *priv = hw->priv;
- int ret;
-
- IWL_DEBUG_MAC80211(priv, "enter\n");
-
- if (req->n_channels == 0)
- return -EINVAL;
-
- mutex_lock(&priv->mutex);
-
- if (test_bit(STATUS_SCANNING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
- ret = -EAGAIN;
- goto out_unlock;
- }
-
- /* mac80211 will only ask for one band at a time */
- priv->scan_request = req;
- priv->scan_vif = vif;
- priv->scan_band = req->channels[0]->band;
-
- ret = iwl_legacy_scan_initiate(priv, vif);
-
- IWL_DEBUG_MAC80211(priv, "leave\n");
-
-out_unlock:
- mutex_unlock(&priv->mutex);
-
- return ret;
-}
-EXPORT_SYMBOL(iwl_legacy_mac_hw_scan);
-
-static void iwl_legacy_bg_scan_check(struct work_struct *data)
-{
- struct iwl_priv *priv =
- container_of(data, struct iwl_priv, scan_check.work);
-
- IWL_DEBUG_SCAN(priv, "Scan check work\n");
-
- /* Since we are here firmware does not finish scan and
- * most likely is in bad shape, so we don't bother to
- * send abort command, just force scan complete to mac80211 */
- mutex_lock(&priv->mutex);
- iwl_legacy_force_scan_end(priv);
- mutex_unlock(&priv->mutex);
-}
-
-/**
- * iwl_legacy_fill_probe_req - fill in all required fields and IE for probe request
- */
-
-u16
-iwl_legacy_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
- const u8 *ta, const u8 *ies, int ie_len, int left)
-{
- int len = 0;
- u8 *pos = NULL;
-
- /* Make sure there is enough space for the probe request,
- * two mandatory IEs and the data */
- left -= 24;
- if (left < 0)
- return 0;
-
- frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
- memcpy(frame->da, iwlegacy_bcast_addr, ETH_ALEN);
- memcpy(frame->sa, ta, ETH_ALEN);
- memcpy(frame->bssid, iwlegacy_bcast_addr, ETH_ALEN);
- frame->seq_ctrl = 0;
-
- len += 24;
-
- /* ...next IE... */
- pos = &frame->u.probe_req.variable[0];
-
- /* fill in our indirect SSID IE */
- left -= 2;
- if (left < 0)
- return 0;
- *pos++ = WLAN_EID_SSID;
- *pos++ = 0;
-
- len += 2;
-
- if (WARN_ON(left < ie_len))
- return len;
-
- if (ies && ie_len) {
- memcpy(pos, ies, ie_len);
- len += ie_len;
- }
-
- return (u16)len;
-}
-EXPORT_SYMBOL(iwl_legacy_fill_probe_req);
-
-static void iwl_legacy_bg_abort_scan(struct work_struct *work)
-{
- struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
-
- IWL_DEBUG_SCAN(priv, "Abort scan work\n");
-
- /* We keep scan_check work queued in case when firmware will not
- * report back scan completed notification */
- mutex_lock(&priv->mutex);
- iwl_legacy_scan_cancel_timeout(priv, 200);
- mutex_unlock(&priv->mutex);
-}
-
-static void iwl_legacy_bg_scan_completed(struct work_struct *work)
-{
- struct iwl_priv *priv =
- container_of(work, struct iwl_priv, scan_completed);
- bool aborted;
-
- IWL_DEBUG_SCAN(priv, "Completed scan.\n");
-
- cancel_delayed_work(&priv->scan_check);
-
- mutex_lock(&priv->mutex);
-
- aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
- if (aborted)
- IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
-
- if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
- IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
- goto out_settings;
- }
-
- iwl_legacy_complete_scan(priv, aborted);
-
-out_settings:
- /* Can we still talk to firmware ? */
- if (!iwl_legacy_is_ready_rf(priv))
- goto out;
-
- /*
- * We do not commit power settings while scan is pending,
- * do it now if the settings changed.
- */
- iwl_legacy_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
- iwl_legacy_set_tx_power(priv, priv->tx_power_next, false);
-
- priv->cfg->ops->utils->post_scan(priv);
-
-out:
- mutex_unlock(&priv->mutex);
-}
-
-void iwl_legacy_setup_scan_deferred_work(struct iwl_priv *priv)
-{
- INIT_WORK(&priv->scan_completed, iwl_legacy_bg_scan_completed);
- INIT_WORK(&priv->abort_scan, iwl_legacy_bg_abort_scan);
- INIT_DELAYED_WORK(&priv->scan_check, iwl_legacy_bg_scan_check);
-}
-EXPORT_SYMBOL(iwl_legacy_setup_scan_deferred_work);
-
-void iwl_legacy_cancel_scan_deferred_work(struct iwl_priv *priv)
-{
- cancel_work_sync(&priv->abort_scan);
- cancel_work_sync(&priv->scan_completed);
-
- if (cancel_delayed_work_sync(&priv->scan_check)) {
- mutex_lock(&priv->mutex);
- iwl_legacy_force_scan_end(priv);
- mutex_unlock(&priv->mutex);
- }
-}
-EXPORT_SYMBOL(iwl_legacy_cancel_scan_deferred_work);