drivers/net/wireless/wl12xx/wl1271_cmd.c

/*
 * 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/module.h>
#include <linux/platform_device.h>
#include <linux/crc7.h>
#include <linux/spi/spi.h>
#include <linux/etherdevice.h>
#include <linux/ieee80211.h>

#include "wl1271.h"
#include "wl1271_reg.h"
#include "wl1271_io.h"
#include "wl1271_acx.h"
#include "wl12xx_80211.h"
#include "wl1271_cmd.h"
#include "wl1271_event.h"

#define WL1271_CMD_POLL_COUNT       5

/*
 * send command to firmware
 *
 * @wl: wl struct
 * @id: command id
 * @buf: buffer containing the command, must work with dma
 * @len: length of the buffer
 */
int wl1271_cmd_send(struct wl1271 *wl, u16 id, void *buf, size_t len,
		    size_t res_len)
{
	struct wl1271_cmd_header *cmd;
	unsigned long timeout;
	u32 intr;
	int ret = 0;
	u16 status;
	u16 poll_count = 0;

	cmd = buf;
	cmd->id = cpu_to_le16(id);
	cmd->status = 0;

	WARN_ON(len % 4 != 0);

	wl1271_write(wl, wl->cmd_box_addr, buf, len, false);

	wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_CMD);

	timeout = jiffies + msecs_to_jiffies(WL1271_COMMAND_TIMEOUT);

	intr = wl1271_read32(wl, ACX_REG_INTERRUPT_NO_CLEAR);
	while (!(intr & WL1271_ACX_INTR_CMD_COMPLETE)) {
		if (time_after(jiffies, timeout)) {
			wl1271_error("command complete timeout");
			ret = -ETIMEDOUT;
			goto out;
		}

		udelay(10);
		poll_count++;
		if (poll_count == WL1271_CMD_POLL_COUNT)
			wl1271_info("cmd polling took over %d cycles",
				    poll_count);

		intr = wl1271_read32(wl, ACX_REG_INTERRUPT_NO_CLEAR);
	}

	/* read back the status code of the command */
	if (res_len == 0)
		res_len = sizeof(struct wl1271_cmd_header);
	wl1271_read(wl, wl->cmd_box_addr, cmd, res_len, false);

	status = le16_to_cpu(cmd->status);
	if (status != CMD_STATUS_SUCCESS) {
		wl1271_error("command execute failure %d", status);
		ret = -EIO;
	}

	wl1271_write32(wl, ACX_REG_INTERRUPT_ACK,
		       WL1271_ACX_INTR_CMD_COMPLETE);

out:
	return ret;
}

static int wl1271_cmd_cal_channel_tune(struct wl1271 *wl)
{
	struct wl1271_cmd_cal_channel_tune *cmd;
	int ret = 0;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	cmd->test.id = TEST_CMD_CHANNEL_TUNE;

	cmd->band = WL1271_CHANNEL_TUNE_BAND_2_4;
	/* set up any channel, 7 is in the middle of the range */
	cmd->channel = 7;

	ret = wl1271_cmd_test(wl, cmd, sizeof(*cmd), 0);
	if (ret < 0)
		wl1271_warning("TEST_CMD_CHANNEL_TUNE failed");

	kfree(cmd);
	return ret;
}

static int wl1271_cmd_cal_update_ref_point(struct wl1271 *wl)
{
	struct wl1271_cmd_cal_update_ref_point *cmd;
	int ret = 0;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	cmd->test.id = TEST_CMD_UPDATE_PD_REFERENCE_POINT;

	/* FIXME: still waiting for the correct values */
	cmd->ref_power    = 0;
	cmd->ref_detector = 0;

	cmd->sub_band     = WL1271_PD_REFERENCE_POINT_BAND_B_G;

	ret = wl1271_cmd_test(wl, cmd, sizeof(*cmd), 0);
	if (ret < 0)
		wl1271_warning("TEST_CMD_UPDATE_PD_REFERENCE_POINT failed");

	kfree(cmd);
	return ret;
}

static int wl1271_cmd_cal_p2g(struct wl1271 *wl)
{
	struct wl1271_cmd_cal_p2g *cmd;
	int ret = 0;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	cmd->test.id = TEST_CMD_P2G_CAL;

	cmd->sub_band_mask = WL1271_CAL_P2G_BAND_B_G;

	ret = wl1271_cmd_test(wl, cmd, sizeof(*cmd), 0);
	if (ret < 0)
		wl1271_warning("TEST_CMD_P2G_CAL failed");

	kfree(cmd);
	return ret;
}

static int wl1271_cmd_cal(struct wl1271 *wl)
{
	/*
	 * FIXME: we must make sure that we're not sleeping when calibration
	 * is done
	 */
	int ret;

	wl1271_notice("performing tx calibration");

	ret = wl1271_cmd_cal_channel_tune(wl);
	if (ret < 0)
		return ret;

	ret = wl1271_cmd_cal_update_ref_point(wl);
	if (ret < 0)
		return ret;

	ret = wl1271_cmd_cal_p2g(wl);
	if (ret < 0)
		return ret;

	return ret;
}

int wl1271_cmd_general_parms(struct wl1271 *wl)
{
	struct wl1271_general_parms_cmd *gen_parms;
	int ret;

	if (!wl->nvs)
		return -ENODEV;

	gen_parms = kzalloc(sizeof(*gen_parms), GFP_KERNEL);
	if (!gen_parms)
		return -ENOMEM;

	gen_parms->test.id = TEST_CMD_INI_FILE_GENERAL_PARAM;

	memcpy(gen_parms->params, wl->nvs->general_params,
	       WL1271_NVS_GENERAL_PARAMS_SIZE);

	ret = wl1271_cmd_test(wl, gen_parms, sizeof(*gen_parms), 0);
	if (ret < 0)
		wl1271_warning("CMD_INI_FILE_GENERAL_PARAM failed");

	kfree(gen_parms);
	return ret;
}

int wl1271_cmd_radio_parms(struct wl1271 *wl)
{
	struct wl1271_radio_parms_cmd *radio_parms;
	struct conf_radio_parms *rparam = &wl->conf.init.radioparam;
	int ret;

	if (!wl->nvs)
		return -ENODEV;

	radio_parms = kzalloc(sizeof(*radio_parms), GFP_KERNEL);
	if (!radio_parms)
		return -ENOMEM;

	radio_parms->test.id = TEST_CMD_INI_FILE_RADIO_PARAM;

	memcpy(radio_parms->stat_radio_params, wl->nvs->stat_radio_params,
	       WL1271_NVS_STAT_RADIO_PARAMS_SIZE);
	memcpy(radio_parms->dyn_radio_params,
	       wl->nvs->dyn_radio_params[rparam->fem],
	       WL1271_NVS_DYN_RADIO_PARAMS_SIZE);

	/* FIXME: current NVS is missing 5GHz parameters */

	wl1271_dump(DEBUG_CMD, "TEST_CMD_INI_FILE_RADIO_PARAM: ",
		    radio_parms, sizeof(*radio_parms));

	ret = wl1271_cmd_test(wl, radio_parms, sizeof(*radio_parms), 0);
	if (ret < 0)
		wl1271_warning("CMD_INI_FILE_RADIO_PARAM failed");

	kfree(radio_parms);
	return ret;
}

/*
 * Poll the mailbox event field until any of the bits in the mask is set or a
 * timeout occurs (WL1271_EVENT_TIMEOUT in msecs)
 */
static int wl1271_cmd_wait_for_event(struct wl1271 *wl, u32 mask)
{
	u32 events_vector, event;
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(WL1271_EVENT_TIMEOUT);

	do {
		if (time_after(jiffies, timeout))
			return -ETIMEDOUT;

		msleep(1);

		/* read from both event fields */
		wl1271_read(wl, wl->mbox_ptr[0], &events_vector,
			    sizeof(events_vector), false);
		event = events_vector & mask;
		wl1271_read(wl, wl->mbox_ptr[1], &events_vector,
			    sizeof(events_vector), false);
		event |= events_vector & mask;
	} while (!event);

	return 0;
}

int wl1271_cmd_join(struct wl1271 *wl, u8 bss_type)
{
	static bool do_cal = true;
	struct wl1271_cmd_join *join;
	int ret, i;
	u8 *bssid;

	/* FIXME: remove when we get calibration from the factory */
	if (do_cal) {
		ret = wl1271_cmd_cal(wl);
		if (ret < 0)
			wl1271_warning("couldn't calibrate");
		else
			do_cal = false;
	}

	join = kzalloc(sizeof(*join), GFP_KERNEL);
	if (!join) {
		ret = -ENOMEM;
		goto out;
	}

	wl1271_debug(DEBUG_CMD, "cmd join");

	/* Reverse order BSSID */
	bssid = (u8 *) &join->bssid_lsb;
	for (i = 0; i < ETH_ALEN; i++)
		bssid[i] = wl->bssid[ETH_ALEN - i - 1];

	join->rx_config_options = cpu_to_le32(wl->rx_config);
	join->rx_filter_options = cpu_to_le32(wl->rx_filter);
	join->bss_type = bss_type;

	if (wl->band == IEEE80211_BAND_2GHZ)
		join->basic_rate_set = cpu_to_le32(CONF_HW_BIT_RATE_1MBPS   |
						   CONF_HW_BIT_RATE_2MBPS   |
						   CONF_HW_BIT_RATE_5_5MBPS |
						   CONF_HW_BIT_RATE_11MBPS);
	else {
		join->bss_type |= WL1271_JOIN_CMD_BSS_TYPE_5GHZ;
		join->basic_rate_set = cpu_to_le32(CONF_HW_BIT_RATE_6MBPS  |
						   CONF_HW_BIT_RATE_12MBPS |
						   CONF_HW_BIT_RATE_24MBPS);
	}

	join->beacon_interval = cpu_to_le16(wl->beacon_int);
	join->dtim_interval = WL1271_DEFAULT_DTIM_PERIOD;

	join->channel = wl->channel;
	join->ssid_len = wl->ssid_len;
	memcpy(join->ssid, wl->ssid, wl->ssid_len);
	join->ctrl = WL1271_JOIN_CMD_CTRL_TX_FLUSH;

	/* increment the session counter */
	wl->session_counter++;
	if (wl->session_counter >= SESSION_COUNTER_MAX)
		wl->session_counter = 0;

	join->ctrl |= wl->session_counter << WL1271_JOIN_CMD_TX_SESSION_OFFSET;

	/* reset TX security counters */
	wl->tx_security_last_seq = 0;
	wl->tx_security_seq = 0;

	ret = wl1271_cmd_send(wl, CMD_START_JOIN, join, sizeof(*join), 0);
	if (ret < 0) {
		wl1271_error("failed to initiate cmd join");
		goto out_free;
	}

	ret = wl1271_cmd_wait_for_event(wl, JOIN_EVENT_COMPLETE_ID);
	if (ret < 0)
		wl1271_error("cmd join event completion error");

out_free:
	kfree(join);

out:
	return ret;
}

/**
 * send test command to firmware
 *
 * @wl: wl struct
 * @buf: buffer containing the command, with all headers, must work with dma
 * @len: length of the buffer
 * @answer: is answer needed
 */
int wl1271_cmd_test(struct wl1271 *wl, void *buf, size_t buf_len, u8 answer)
{
	int ret;
	size_t res_len = 0;

	wl1271_debug(DEBUG_CMD, "cmd test");

	if (answer)
		res_len = buf_len;

	ret = wl1271_cmd_send(wl, CMD_TEST, buf, buf_len, res_len);

	if (ret < 0) {
		wl1271_warning("TEST command failed");
		return ret;
	}

	return ret;
}

/**
 * read acx from firmware
 *
 * @wl: wl struct
 * @id: acx id
 * @buf: buffer for the response, including all headers, must work with dma
 * @len: lenght of buf
 */
int wl1271_cmd_interrogate(struct wl1271 *wl, u16 id, void *buf, size_t len)
{
	struct acx_header *acx = buf;
	int ret;

	wl1271_debug(DEBUG_CMD, "cmd interrogate");

	acx->id = cpu_to_le16(id);

	/* payload length, does not include any headers */
	acx->len = cpu_to_le16(len - sizeof(*acx));

	ret = wl1271_cmd_send(wl, CMD_INTERROGATE, acx, sizeof(*acx), len);
	if (ret < 0)
		wl1271_error("INTERROGATE command failed");

	return ret;
}

/**
 * write acx value to firmware
 *
 * @wl: wl struct
 * @id: acx id
 * @buf: buffer containing acx, including all headers, must work with dma
 * @len: length of buf
 */
int wl1271_cmd_configure(struct wl1271 *wl, u16 id, void *buf, size_t len)
{
	struct acx_header *acx = buf;
	int ret;

	wl1271_debug(DEBUG_CMD, "cmd configure");

	acx->id = cpu_to_le16(id);

	/* payload length, does not include any headers */
	acx->len = cpu_to_le16(len - sizeof(*acx));

	ret = wl1271_cmd_send(wl, CMD_CONFIGURE, acx, len, 0);
	if (ret < 0) {
		wl1271_warning("CONFIGURE command NOK");
		return ret;
	}

	return 0;
}

int wl1271_cmd_data_path(struct wl1271 *wl, bool enable)
{
	struct cmd_enabledisable_path *cmd;
	int ret;
	u16 cmd_rx, cmd_tx;

	wl1271_debug(DEBUG_CMD, "cmd data path");

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	/* the channel here is only used for calibration, so hardcoded to 1 */
	cmd->channel = 1;

	if (enable) {
		cmd_rx = CMD_ENABLE_RX;
		cmd_tx = CMD_ENABLE_TX;
	} else {
		cmd_rx = CMD_DISABLE_RX;
		cmd_tx = CMD_DISABLE_TX;
	}

	ret = wl1271_cmd_send(wl, cmd_rx, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("rx %s cmd for channel %d failed",
			     enable ? "start" : "stop", cmd->channel);
		goto out;
	}

	wl1271_debug(DEBUG_BOOT, "rx %s cmd channel %d",
		     enable ? "start" : "stop", cmd->channel);

	ret = wl1271_cmd_send(wl, cmd_tx, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("tx %s cmd for channel %d failed",
			     enable ? "start" : "stop", cmd->channel);
		goto out;
	}

	wl1271_debug(DEBUG_BOOT, "tx %s cmd channel %d",
		     enable ? "start" : "stop", cmd->channel);

out:
	kfree(cmd);
	return ret;
}

int wl1271_cmd_ps_mode(struct wl1271 *wl, u8 ps_mode, bool send)
{
	struct wl1271_cmd_ps_params *ps_params = NULL;
	int ret = 0;

	/* FIXME: this should be in ps.c */
	ret = wl1271_acx_wake_up_conditions(wl);
	if (ret < 0) {
		wl1271_error("couldn't set wake up conditions");
		goto out;
	}

	wl1271_debug(DEBUG_CMD, "cmd set ps mode");

	ps_params = kzalloc(sizeof(*ps_params), GFP_KERNEL);
	if (!ps_params) {
		ret = -ENOMEM;
		goto out;
	}

	ps_params->ps_mode = ps_mode;
	ps_params->send_null_data = send;
	ps_params->retries = 5;
	ps_params->hang_over_period = 128;
	ps_params->null_data_rate = cpu_to_le32(1); /* 1 Mbps */

	ret = wl1271_cmd_send(wl, CMD_SET_PS_MODE, ps_params,
			      sizeof(*ps_params), 0);
	if (ret < 0) {
		wl1271_error("cmd set_ps_mode failed");
		goto out;
	}

out:
	kfree(ps_params);
	return ret;
}

int wl1271_cmd_read_memory(struct wl1271 *wl, u32 addr, void *answer,
			   size_t len)
{
	struct cmd_read_write_memory *cmd;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd read memory");

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	WARN_ON(len > MAX_READ_SIZE);
	len = min_t(size_t, len, MAX_READ_SIZE);

	cmd->addr = cpu_to_le32(addr);
	cmd->size = cpu_to_le32(len);

	ret = wl1271_cmd_send(wl, CMD_READ_MEMORY, cmd, sizeof(*cmd),
			      sizeof(*cmd));
	if (ret < 0) {
		wl1271_error("read memory command failed: %d", ret);
		goto out;
	}

	/* the read command got in */
	memcpy(answer, cmd->value, len);

out:
	kfree(cmd);
	return ret;
}

int wl1271_cmd_scan(struct wl1271 *wl, const u8 *ssid, size_t ssid_len,
		    const u8 *ie, size_t ie_len, 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;
	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;
	else if (band == WL1271_SCAN_BAND_DUAL && wl1271_11a_enabled())
		ieee_band = IEEE80211_BAND_2GHZ;
	else if (band == WL1271_SCAN_BAND_5_GHZ && wl1271_11a_enabled())
		ieee_band = IEEE80211_BAND_5GHZ;
	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;
	/* Let the fw autodetect suitable tx_rate for probes */
	params->params.tx_rate = 0;
	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,
					 ie, 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;
		}
	}

	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_cmd_template_set(struct wl1271 *wl, u16 template_id,
			    void *buf, size_t buf_len, int index)
{
	struct wl1271_cmd_template_set *cmd;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd template_set %d", template_id);

	WARN_ON(buf_len > WL1271_CMD_TEMPL_MAX_SIZE);
	buf_len = min_t(size_t, buf_len, WL1271_CMD_TEMPL_MAX_SIZE);

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	cmd->len = cpu_to_le16(buf_len);
	cmd->template_type = template_id;
	cmd->enabled_rates = cpu_to_le32(wl->conf.tx.rc_conf.enabled_rates);
	cmd->short_retry_limit = wl->conf.tx.rc_conf.short_retry_limit;
	cmd->long_retry_limit = wl->conf.tx.rc_conf.long_retry_limit;
	cmd->index = index;

	if (buf)
		memcpy(cmd->template_data, buf, buf_len);

	ret = wl1271_cmd_send(wl, CMD_SET_TEMPLATE, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_warning("cmd set_template failed: %d", ret);
		goto out_free;
	}

out_free:
	kfree(cmd);

out:
	return ret;
}

int wl1271_cmd_build_null_data(struct wl1271 *wl)
{
	struct sk_buff *skb = NULL;
	int size;
	void *ptr;
	int ret = -ENOMEM;


	if (wl->bss_type == BSS_TYPE_IBSS) {
		size = sizeof(struct wl12xx_null_data_template);
		ptr = NULL;
	} else {
		skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
		if (!skb)
			goto out;
		size = skb->len;
		ptr = skb->data;
	}

	ret = wl1271_cmd_template_set(wl, CMD_TEMPL_NULL_DATA, ptr, size, 0);

out:
	dev_kfree_skb(skb);
	if (ret)
		wl1271_warning("cmd buld null data failed %d", ret);

	return ret;

}

int wl1271_cmd_build_klv_null_data(struct wl1271 *wl)
{
	struct sk_buff *skb = NULL;
	int ret = -ENOMEM;

	skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
	if (!skb)
		goto out;

	ret = wl1271_cmd_template_set(wl, CMD_TEMPL_KLV,
				      skb->data, skb->len,
				      CMD_TEMPL_KLV_IDX_NULL_DATA);

out:
	dev_kfree_skb(skb);
	if (ret)
		wl1271_warning("cmd build klv null data failed %d", ret);

	return ret;

}

int wl1271_cmd_build_ps_poll(struct wl1271 *wl, u16 aid)
{
	struct sk_buff *skb;
	int ret = 0;

	skb = ieee80211_pspoll_get(wl->hw, wl->vif);
	if (!skb)
		goto out;

	ret = wl1271_cmd_template_set(wl, CMD_TEMPL_PS_POLL, skb->data,
				      skb->len, 0);

out:
	dev_kfree_skb(skb);
	return ret;
}

int wl1271_cmd_build_probe_req(struct wl1271 *wl,
			       const u8 *ssid, size_t ssid_len,
			       const u8 *ie, size_t ie_len, u8 band)
{
	struct sk_buff *skb;
	int ret;

	skb = ieee80211_probereq_get(wl->hw, wl->vif, ssid, ssid_len,
				     ie, ie_len);
	if (!skb) {
		ret = -ENOMEM;
		goto out;
	}

	wl1271_dump(DEBUG_SCAN, "PROBE REQ: ", skb->data, skb->len);

	if (band == IEEE80211_BAND_2GHZ)
		ret = wl1271_cmd_template_set(wl, CMD_TEMPL_CFG_PROBE_REQ_2_4,
					      skb->data, skb->len, 0);
	else
		ret = wl1271_cmd_template_set(wl, CMD_TEMPL_CFG_PROBE_REQ_5,
					      skb->data, skb->len, 0);

out:
	dev_kfree_skb(skb);
	return ret;
}

int wl1271_build_qos_null_data(struct wl1271 *wl)
{
	struct ieee80211_qos_hdr template;

	memset(&template, 0, sizeof(template));

	memcpy(template.addr1, wl->bssid, ETH_ALEN);
	memcpy(template.addr2, wl->mac_addr, ETH_ALEN);
	memcpy(template.addr3, wl->bssid, ETH_ALEN);

	template.frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					     IEEE80211_STYPE_QOS_NULLFUNC |
					     IEEE80211_FCTL_TODS);

	/* FIXME: not sure what priority to use here */
	template.qos_ctrl = cpu_to_le16(0);

	return wl1271_cmd_template_set(wl, CMD_TEMPL_QOS_NULL_DATA, &template,
				       sizeof(template), 0);
}

int wl1271_cmd_set_default_wep_key(struct wl1271 *wl, u8 id)
{
	struct wl1271_cmd_set_keys *cmd;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd set_default_wep_key %d", id);

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	cmd->id = id;
	cmd->key_action = cpu_to_le16(KEY_SET_ID);
	cmd->key_type = KEY_WEP;

	ret = wl1271_cmd_send(wl, CMD_SET_KEYS, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_warning("cmd set_default_wep_key failed: %d", ret);
		goto out;
	}

out:
	kfree(cmd);

	return ret;
}

int wl1271_cmd_set_key(struct wl1271 *wl, u16 action, u8 id, u8 key_type,
		       u8 key_size, const u8 *key, const u8 *addr,
		       u32 tx_seq_32, u16 tx_seq_16)
{
	struct wl1271_cmd_set_keys *cmd;
	int ret = 0;

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	if (key_type != KEY_WEP)
		memcpy(cmd->addr, addr, ETH_ALEN);

	cmd->key_action = cpu_to_le16(action);
	cmd->key_size = key_size;
	cmd->key_type = key_type;

	cmd->ac_seq_num16[0] = cpu_to_le16(tx_seq_16);
	cmd->ac_seq_num32[0] = cpu_to_le32(tx_seq_32);

	/* we have only one SSID profile */
	cmd->ssid_profile = 0;

	cmd->id = id;

	if (key_type == KEY_TKIP) {
		/*
		 * We get the key in the following form:
		 * TKIP (16 bytes) - TX MIC (8 bytes) - RX MIC (8 bytes)
		 * but the target is expecting:
		 * TKIP - RX MIC - TX MIC
		 */
		memcpy(cmd->key, key, 16);
		memcpy(cmd->key + 16, key + 24, 8);
		memcpy(cmd->key + 24, key + 16, 8);

	} else {
		memcpy(cmd->key, key, key_size);
	}

	wl1271_dump(DEBUG_CRYPT, "TARGET KEY: ", cmd, sizeof(*cmd));

	ret = wl1271_cmd_send(wl, CMD_SET_KEYS, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_warning("could not set keys");
	goto out;
	}

out:
	kfree(cmd);

	return ret;
}

int wl1271_cmd_disconnect(struct wl1271 *wl)
{
	struct wl1271_cmd_disconnect *cmd;
	int ret = 0;

	wl1271_debug(DEBUG_CMD, "cmd disconnect");

	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd) {
		ret = -ENOMEM;
		goto out;
	}

	cmd->rx_config_options = cpu_to_le32(wl->rx_config);
	cmd->rx_filter_options = cpu_to_le32(wl->rx_filter);
	/* disconnect reason is not used in immediate disconnections */
	cmd->type = DISCONNECT_IMMEDIATE;

	ret = wl1271_cmd_send(wl, CMD_DISCONNECT, cmd, sizeof(*cmd), 0);
	if (ret < 0) {
		wl1271_error("failed to send disconnect command");
		goto out_free;
	}

	ret = wl1271_cmd_wait_for_event(wl, DISCONNECT_EVENT_COMPLETE_ID);
	if (ret < 0)
		wl1271_error("cmd disconnect event completion error");

out_free:
	kfree(cmd);

out:
	return ret;
}