wl1271: moved scan operations to a separate file

The scanning code is going to get a bit more complex, with proper support for
active/passive scans together with 2.4GHz and 5GHz.  In the future, also a
new type of scan (periodic scan) will be added.  When all this is
implemented, the code is going to be much more complex, so we'd better
separate it into a separate file.

This patch doesn't have any impact on functionality.

Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Saravanan Dhanabal <ext-saravanan.dhanabal@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 191 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl12xx/wl1271_scan.c b/drivers/net/wireless/wl12xx/wl1271_scan.c
new file mode 100644
index 000000000000..eb9b4ece4ec3
--- /dev/null
+++ b/drivers/net/wireless/wl12xx/wl1271_scan.c
@@ -0,0 +1,191 @@
+/*
+ * 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 "wl1271.h"
+#include "wl1271_cmd.h"
+#include "wl1271_scan.h"
+#include "wl1271_acx.h"
+
+int wl1271_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
+		struct cfg80211_scan_request *req, u8 active_scan,
+		u8 high_prio, u8 band, u8 probe_requests)
+{
+
+	struct wl1271_cmd_trigger_scan_to *trigger = NULL;
+	struct wl1271_cmd_scan *params = NULL;
+	struct ieee80211_channel *channels;
+	u32 rate;
+	int i, j, n_ch, ret;
+	u16 scan_options = 0;
+	u8 ieee_band;
+
+	if (band == WL1271_SCAN_BAND_2_4_GHZ) {
+		ieee_band = IEEE80211_BAND_2GHZ;
+		rate = wl->conf.tx.basic_rate;
+	} else if (band == WL1271_SCAN_BAND_DUAL && wl1271_11a_enabled()) {
+		ieee_band = IEEE80211_BAND_2GHZ;
+		rate = wl->conf.tx.basic_rate;
+	} else if (band == WL1271_SCAN_BAND_5_GHZ && wl1271_11a_enabled()) {
+		ieee_band = IEEE80211_BAND_5GHZ;
+		rate = wl->conf.tx.basic_rate_5;
+	} else
+		return -EINVAL;
+
+	if (wl->hw->wiphy->bands[ieee_band]->channels == NULL)
+		return -EINVAL;
+
+	channels = wl->hw->wiphy->bands[ieee_band]->channels;
+	n_ch = wl->hw->wiphy->bands[ieee_band]->n_channels;
+
+	if (test_bit(WL1271_FLAG_SCANNING, &wl->flags))
+		return -EINVAL;
+
+	params = kzalloc(sizeof(*params), GFP_KERNEL);
+	if (!params)
+		return -ENOMEM;
+
+	params->params.rx_config_options = cpu_to_le32(CFG_RX_ALL_GOOD);
+	params->params.rx_filter_options =
+		cpu_to_le32(CFG_RX_PRSP_EN | CFG_RX_MGMT_EN | CFG_RX_BCN_EN);
+
+	if (!active_scan)
+		scan_options |= WL1271_SCAN_OPT_PASSIVE;
+	if (high_prio)
+		scan_options |= WL1271_SCAN_OPT_PRIORITY_HIGH;
+	params->params.scan_options = cpu_to_le16(scan_options);
+
+	params->params.num_probe_requests = probe_requests;
+	params->params.tx_rate = cpu_to_le32(rate);
+	params->params.tid_trigger = 0;
+	params->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
+
+	if (band == WL1271_SCAN_BAND_DUAL)
+		params->params.band = WL1271_SCAN_BAND_2_4_GHZ;
+	else
+		params->params.band = band;
+
+	for (i = 0, j = 0; i < n_ch && i < WL1271_SCAN_MAX_CHANNELS; i++) {
+		if (!(channels[i].flags & IEEE80211_CHAN_DISABLED)) {
+			params->channels[j].min_duration =
+				cpu_to_le32(WL1271_SCAN_CHAN_MIN_DURATION);
+			params->channels[j].max_duration =
+				cpu_to_le32(WL1271_SCAN_CHAN_MAX_DURATION);
+			memset(&params->channels[j].bssid_lsb, 0xff, 4);
+			memset(&params->channels[j].bssid_msb, 0xff, 2);
+			params->channels[j].early_termination = 0;
+			params->channels[j].tx_power_att =
+				WL1271_SCAN_CURRENT_TX_PWR;
+			params->channels[j].channel = channels[i].hw_value;
+			j++;
+		}
+	}
+
+	params->params.num_channels = j;
+
+	if (ssid_len && ssid) {
+		params->params.ssid_len = ssid_len;
+		memcpy(params->params.ssid, ssid, ssid_len);
+	}
+
+	ret = wl1271_cmd_build_probe_req(wl, ssid, ssid_len,
+					 req->ie, req->ie_len, ieee_band);
+	if (ret < 0) {
+		wl1271_error("PROBE request template failed");
+		goto out;
+	}
+
+	trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
+	if (!trigger) {
+		ret = -ENOMEM;
+		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: ", params, sizeof(*params));
+
+	set_bit(WL1271_FLAG_SCANNING, &wl->flags);
+	if (wl1271_11a_enabled()) {
+		wl->scan.state = band;
+		if (band == WL1271_SCAN_BAND_DUAL) {
+			wl->scan.active = active_scan;
+			wl->scan.high_prio = high_prio;
+			wl->scan.probe_requests = probe_requests;
+			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;
+		} else
+			wl->scan.req = NULL;
+	}
+
+	ret = wl1271_cmd_send(wl, CMD_SCAN, params, sizeof(*params), 0);
+	if (ret < 0) {
+		wl1271_error("SCAN failed");
+		clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
+		goto out;
+	}
+
+out:
+	kfree(params);
+	kfree(trigger);
+	return ret;
+}
+
+int wl1271_scan_complete(struct wl1271 *wl)
+{
+	if (test_bit(WL1271_FLAG_SCANNING, &wl->flags)) {
+		if (wl->scan.state == WL1271_SCAN_BAND_DUAL) {
+			/* 2.4 GHz band scanned, scan 5 GHz band, pretend to
+			 * the wl1271_scan function that we are not scanning
+			 * as it checks that.
+			 */
+			clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
+			/* FIXME: ie missing! */
+			wl1271_scan(wl, wl->scan.ssid, wl->scan.ssid_len,
+				    wl->scan.req,
+				    wl->scan.active,
+				    wl->scan.high_prio,
+				    WL1271_SCAN_BAND_5_GHZ,
+				    wl->scan.probe_requests);
+		} else {
+			mutex_unlock(&wl->mutex);
+			ieee80211_scan_completed(wl->hw, false);
+			mutex_lock(&wl->mutex);
+			clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
+		}
+	}
+	return 0;
+}