1 files changed, 549 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlegacy/iwl-scan.c b/drivers/net/wireless/iwlegacy/iwl-scan.c
new file mode 100644
index 00000000000..a6b5222fc59
--- /dev/null
+++ b/drivers/net/wireless/iwlegacy/iwl-scan.c
@@ -0,0 +1,549 @@
+/******************************************************************************
+ *
+ * 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 <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);