xref: /drivers/net/wireless/wl1251/main.c

/*
 * This file is part of wl1251
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Kalle Valo <kalle.valo@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/interrupt.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/spi/spi.h>
#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/spi/wl12xx.h>

#include "wl1251.h"
#include "wl12xx_80211.h"
#include "reg.h"
#include "wl1251_ops.h"
#include "wl1251_spi.h"
#include "wl1251_event.h"
#include "wl1251_tx.h"
#include "wl1251_rx.h"
#include "wl1251_ps.h"
#include "wl1251_init.h"
#include "wl1251_debugfs.h"

static void wl1251_disable_interrupts(struct wl1251 *wl)
{
	disable_irq(wl->irq);
}

static void wl1251_power_off(struct wl1251 *wl)
{
	wl->set_power(false);
}

static void wl1251_power_on(struct wl1251 *wl)
{
	wl->set_power(true);
}

static irqreturn_t wl1251_irq(int irq, void *cookie)
{
	struct wl1251 *wl;

	wl1251_debug(DEBUG_IRQ, "IRQ");

	wl = cookie;

	schedule_work(&wl->irq_work);

	return IRQ_HANDLED;
}

static int wl1251_fetch_firmware(struct wl1251 *wl)
{
	const struct firmware *fw;
	int ret;

	ret = request_firmware(&fw, wl->chip.fw_filename, &wl->spi->dev);

	if (ret < 0) {
		wl1251_error("could not get firmware: %d", ret);
		return ret;
	}

	if (fw->size % 4) {
		wl1251_error("firmware size is not multiple of 32 bits: %zu",
			     fw->size);
		ret = -EILSEQ;
		goto out;
	}

	wl->fw_len = fw->size;
	wl->fw = kmalloc(wl->fw_len, GFP_KERNEL);

	if (!wl->fw) {
		wl1251_error("could not allocate memory for the firmware");
		ret = -ENOMEM;
		goto out;
	}

	memcpy(wl->fw, fw->data, wl->fw_len);

	ret = 0;

out:
	release_firmware(fw);

	return ret;
}

static int wl1251_fetch_nvs(struct wl1251 *wl)
{
	const struct firmware *fw;
	int ret;

	ret = request_firmware(&fw, wl->chip.nvs_filename, &wl->spi->dev);

	if (ret < 0) {
		wl1251_error("could not get nvs file: %d", ret);
		return ret;
	}

	if (fw->size % 4) {
		wl1251_error("nvs size is not multiple of 32 bits: %zu",
			     fw->size);
		ret = -EILSEQ;
		goto out;
	}

	wl->nvs_len = fw->size;
	wl->nvs = kmalloc(wl->nvs_len, GFP_KERNEL);

	if (!wl->nvs) {
		wl1251_error("could not allocate memory for the nvs file");
		ret = -ENOMEM;
		goto out;
	}

	memcpy(wl->nvs, fw->data, wl->nvs_len);

	ret = 0;

out:
	release_firmware(fw);

	return ret;
}

static void wl1251_fw_wakeup(struct wl1251 *wl)
{
	u32 elp_reg;

	elp_reg = ELPCTRL_WAKE_UP;
	wl1251_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, elp_reg);
	elp_reg = wl1251_read32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);

	if (!(elp_reg & ELPCTRL_WLAN_READY))
		wl1251_warning("WLAN not ready");
}

static int wl1251_chip_wakeup(struct wl1251 *wl)
{
	int ret = 0;

	wl1251_power_on(wl);
	msleep(wl->chip.power_on_sleep);
	wl1251_spi_reset(wl);
	wl1251_spi_init(wl);

	/* We don't need a real memory partition here, because we only want
	 * to use the registers at this point. */
	wl1251_set_partition(wl,
			     0x00000000,
			     0x00000000,
			     REGISTERS_BASE,
			     REGISTERS_DOWN_SIZE);

	/* ELP module wake up */
	wl1251_fw_wakeup(wl);

	/* whal_FwCtrl_BootSm() */

	/* 0. read chip id from CHIP_ID */
	wl->chip.id = wl1251_reg_read32(wl, CHIP_ID_B);

	/* 1. check if chip id is valid */

	switch (wl->chip.id) {
	case CHIP_ID_1251_PG12:
		wl1251_debug(DEBUG_BOOT, "chip id 0x%x (1251 PG12)",
			     wl->chip.id);

		wl1251_setup(wl);

		break;
	case CHIP_ID_1251_PG10:
	case CHIP_ID_1251_PG11:
	default:
		wl1251_error("unsupported chip id: 0x%x", wl->chip.id);
		ret = -ENODEV;
		goto out;
	}

	if (wl->fw == NULL) {
		ret = wl1251_fetch_firmware(wl);
		if (ret < 0)
			goto out;
	}

	/* No NVS from netlink, try to get it from the filesystem */
	if (wl->nvs == NULL) {
		ret = wl1251_fetch_nvs(wl);
		if (ret < 0)
			goto out;
	}

out:
	return ret;
}

static void wl1251_filter_work(struct work_struct *work)
{
	struct wl1251 *wl =
		container_of(work, struct wl1251, filter_work);
	int ret;

	mutex_lock(&wl->mutex);

	if (wl->state == WL1251_STATE_OFF)
		goto out;

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	/* FIXME: replace the magic numbers with proper definitions */
	ret = wl->chip.op_cmd_join(wl, wl->bss_type, 1, 100, 0);
	if (ret < 0)
		goto out_sleep;

out_sleep:
	wl1251_ps_elp_sleep(wl);

out:
	mutex_unlock(&wl->mutex);
}

int wl1251_plt_start(struct wl1251 *wl)
{
	int ret;

	mutex_lock(&wl->mutex);

	wl1251_notice("power up");

	if (wl->state != WL1251_STATE_OFF) {
		wl1251_error("cannot go into PLT state because not "
			     "in off state: %d", wl->state);
		return -EBUSY;
	}

	wl->state = WL1251_STATE_PLT;

	ret = wl1251_chip_wakeup(wl);
	if (ret < 0)
		return ret;

	ret = wl->chip.op_boot(wl);
	if (ret < 0)
		return ret;

	wl1251_notice("firmware booted in PLT mode (%s)", wl->chip.fw_ver);

	ret = wl->chip.op_plt_init(wl);
	if (ret < 0)
		return ret;

	return 0;
}

int wl1251_plt_stop(struct wl1251 *wl)
{
	mutex_lock(&wl->mutex);

	wl1251_notice("power down");

	if (wl->state != WL1251_STATE_PLT) {
		wl1251_error("cannot power down because not in PLT "
			     "state: %d", wl->state);
		return -EBUSY;
	}

	wl1251_disable_interrupts(wl);
	wl1251_power_off(wl);

	wl->state = WL1251_STATE_OFF;

	return 0;
}


static int wl1251_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	struct wl1251 *wl = hw->priv;

	skb_queue_tail(&wl->tx_queue, skb);

	/*
	 * The chip specific setup must run before the first TX packet -
	 * before that, the tx_work will not be initialized!
	 */

	schedule_work(&wl->tx_work);

	/*
	 * The workqueue is slow to process the tx_queue and we need stop
	 * the queue here, otherwise the queue will get too long.
	 */
	if (skb_queue_len(&wl->tx_queue) >= WL1251_TX_QUEUE_MAX_LENGTH) {
		ieee80211_stop_queues(wl->hw);

		/*
		 * FIXME: this is racy, the variable is not properly
		 * protected. Maybe fix this by removing the stupid
		 * variable altogether and checking the real queue state?
		 */
		wl->tx_queue_stopped = true;
	}

	return NETDEV_TX_OK;
}

static int wl1251_op_start(struct ieee80211_hw *hw)
{
	struct wl1251 *wl = hw->priv;
	int ret = 0;

	wl1251_debug(DEBUG_MAC80211, "mac80211 start");

	mutex_lock(&wl->mutex);

	if (wl->state != WL1251_STATE_OFF) {
		wl1251_error("cannot start because not in off state: %d",
			     wl->state);
		ret = -EBUSY;
		goto out;
	}

	ret = wl1251_chip_wakeup(wl);
	if (ret < 0)
		return ret;

	ret = wl->chip.op_boot(wl);
	if (ret < 0)
		goto out;

	ret = wl->chip.op_hw_init(wl);
	if (ret < 0)
		goto out;

	ret = wl1251_acx_station_id(wl);
	if (ret < 0)
		goto out;

	wl->state = WL1251_STATE_ON;

	wl1251_info("firmware booted (%s)", wl->chip.fw_ver);

out:
	if (ret < 0)
		wl1251_power_off(wl);

	mutex_unlock(&wl->mutex);

	return ret;
}

static void wl1251_op_stop(struct ieee80211_hw *hw)
{
	struct wl1251 *wl = hw->priv;

	wl1251_info("down");

	wl1251_debug(DEBUG_MAC80211, "mac80211 stop");

	mutex_lock(&wl->mutex);

	WARN_ON(wl->state != WL1251_STATE_ON);

	if (wl->scanning) {
		mutex_unlock(&wl->mutex);
		ieee80211_scan_completed(wl->hw, true);
		mutex_lock(&wl->mutex);
		wl->scanning = false;
	}

	wl->state = WL1251_STATE_OFF;

	wl1251_disable_interrupts(wl);

	mutex_unlock(&wl->mutex);

	cancel_work_sync(&wl->irq_work);
	cancel_work_sync(&wl->tx_work);
	cancel_work_sync(&wl->filter_work);

	mutex_lock(&wl->mutex);

	/* let's notify MAC80211 about the remaining pending TX frames */
	wl->chip.op_tx_flush(wl);
	wl1251_power_off(wl);

	memset(wl->bssid, 0, ETH_ALEN);
	wl->listen_int = 1;
	wl->bss_type = MAX_BSS_TYPE;

	wl->data_in_count = 0;
	wl->rx_counter = 0;
	wl->rx_handled = 0;
	wl->rx_current_buffer = 0;
	wl->rx_last_id = 0;
	wl->next_tx_complete = 0;
	wl->elp = false;
	wl->psm = 0;
	wl->tx_queue_stopped = false;
	wl->power_level = WL1251_DEFAULT_POWER_LEVEL;

	wl1251_debugfs_reset(wl);

	mutex_unlock(&wl->mutex);
}

static int wl1251_op_add_interface(struct ieee80211_hw *hw,
				   struct ieee80211_if_init_conf *conf)
{
	struct wl1251 *wl = hw->priv;
	DECLARE_MAC_BUF(mac);
	int ret = 0;

	wl1251_debug(DEBUG_MAC80211, "mac80211 add interface type %d mac %s",
		     conf->type, print_mac(mac, conf->mac_addr));

	mutex_lock(&wl->mutex);

	switch (conf->type) {
	case NL80211_IFTYPE_STATION:
		wl->bss_type = BSS_TYPE_STA_BSS;
		break;
	case NL80211_IFTYPE_ADHOC:
		wl->bss_type = BSS_TYPE_IBSS;
		break;
	default:
		ret = -EOPNOTSUPP;
		goto out;
	}

	if (memcmp(wl->mac_addr, conf->mac_addr, ETH_ALEN)) {
		memcpy(wl->mac_addr, conf->mac_addr, ETH_ALEN);
		SET_IEEE80211_PERM_ADDR(wl->hw, wl->mac_addr);
		ret = wl1251_acx_station_id(wl);
		if (ret < 0)
			goto out;
	}

out:
	mutex_unlock(&wl->mutex);
	return ret;
}

static void wl1251_op_remove_interface(struct ieee80211_hw *hw,
					 struct ieee80211_if_init_conf *conf)
{
	wl1251_debug(DEBUG_MAC80211, "mac80211 remove interface");
}

static int wl1251_build_null_data(struct wl1251 *wl)
{
	struct wl12xx_null_data_template template;

	if (!is_zero_ether_addr(wl->bssid)) {
		memcpy(template.header.da, wl->bssid, ETH_ALEN);
		memcpy(template.header.bssid, wl->bssid, ETH_ALEN);
	} else {
		memset(template.header.da, 0xff, ETH_ALEN);
		memset(template.header.bssid, 0xff, ETH_ALEN);
	}

	memcpy(template.header.sa, wl->mac_addr, ETH_ALEN);
	template.header.frame_ctl = cpu_to_le16(IEEE80211_FTYPE_DATA |
						IEEE80211_STYPE_NULLFUNC);

	return wl1251_cmd_template_set(wl, CMD_NULL_DATA, &template,
				       sizeof(template));

}

static int wl1251_build_ps_poll(struct wl1251 *wl, u16 aid)
{
	struct wl12xx_ps_poll_template template;

	memcpy(template.bssid, wl->bssid, ETH_ALEN);
	memcpy(template.ta, wl->mac_addr, ETH_ALEN);
	template.aid = aid;
	template.fc = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL);

	return wl1251_cmd_template_set(wl, CMD_PS_POLL, &template,
				       sizeof(template));

}

static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
{
	struct wl1251 *wl = hw->priv;
	struct ieee80211_conf *conf = &hw->conf;
	int channel, ret = 0;

	channel = ieee80211_frequency_to_channel(conf->channel->center_freq);

	wl1251_debug(DEBUG_MAC80211, "mac80211 config ch %d psm %s power %d",
		     channel,
		     conf->flags & IEEE80211_CONF_PS ? "on" : "off",
		     conf->power_level);

	mutex_lock(&wl->mutex);

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	if (channel != wl->channel) {
		/* FIXME: use beacon interval provided by mac80211 */
		ret = wl->chip.op_cmd_join(wl, wl->bss_type, 1, 100, 0);
		if (ret < 0)
			goto out_sleep;

		wl->channel = channel;
	}

	ret = wl1251_build_null_data(wl);
	if (ret < 0)
		goto out_sleep;

	if (conf->flags & IEEE80211_CONF_PS && !wl->psm_requested) {
		wl1251_debug(DEBUG_PSM, "psm enabled");

		wl->psm_requested = true;

		/*
		 * We enter PSM only if we're already associated.
		 * If we're not, we'll enter it when joining an SSID,
		 * through the bss_info_changed() hook.
		 */
		ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
	} else if (!(conf->flags & IEEE80211_CONF_PS) &&
		   wl->psm_requested) {
		wl1251_debug(DEBUG_PSM, "psm disabled");

		wl->psm_requested = false;

		if (wl->psm)
			ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
	}

	if (conf->power_level != wl->power_level) {
		ret = wl1251_acx_tx_power(wl, conf->power_level);
		if (ret < 0)
			goto out;

		wl->power_level = conf->power_level;
	}

out_sleep:
	wl1251_ps_elp_sleep(wl);

out:
	mutex_unlock(&wl->mutex);

	return ret;
}

#define WL1251_SUPPORTED_FILTERS (FIF_PROMISC_IN_BSS | \
				  FIF_ALLMULTI | \
				  FIF_FCSFAIL | \
				  FIF_BCN_PRBRESP_PROMISC | \
				  FIF_CONTROL | \
				  FIF_OTHER_BSS)

static void wl1251_op_configure_filter(struct ieee80211_hw *hw,
				       unsigned int changed,
				       unsigned int *total,
				       int mc_count,
				       struct dev_addr_list *mc_list)
{
	struct wl1251 *wl = hw->priv;

	wl1251_debug(DEBUG_MAC80211, "mac80211 configure filter");

	*total &= WL1251_SUPPORTED_FILTERS;
	changed &= WL1251_SUPPORTED_FILTERS;

	if (changed == 0)
		/* no filters which we support changed */
		return;

	/* FIXME: wl->rx_config and wl->rx_filter are not protected */

	wl->rx_config = WL1251_DEFAULT_RX_CONFIG;
	wl->rx_filter = WL1251_DEFAULT_RX_FILTER;

	if (*total & FIF_PROMISC_IN_BSS) {
		wl->rx_config |= CFG_BSSID_FILTER_EN;
		wl->rx_config |= CFG_RX_ALL_GOOD;
	}
	if (*total & FIF_ALLMULTI)
		/*
		 * CFG_MC_FILTER_EN in rx_config needs to be 0 to receive
		 * all multicast frames
		 */
		wl->rx_config &= ~CFG_MC_FILTER_EN;
	if (*total & FIF_FCSFAIL)
		wl->rx_filter |= CFG_RX_FCS_ERROR;
	if (*total & FIF_BCN_PRBRESP_PROMISC) {
		wl->rx_config &= ~CFG_BSSID_FILTER_EN;
		wl->rx_config &= ~CFG_SSID_FILTER_EN;
	}
	if (*total & FIF_CONTROL)
		wl->rx_filter |= CFG_RX_CTL_EN;
	if (*total & FIF_OTHER_BSS)
		wl->rx_filter &= ~CFG_BSSID_FILTER_EN;

	/*
	 * FIXME: workqueues need to be properly cancelled on stop(), for
	 * now let's just disable changing the filter settings. They will
	 * be updated any on config().
	 */
	/* schedule_work(&wl->filter_work); */
}

/* HW encryption */
static int wl1251_set_key_type(struct wl1251 *wl,
			       struct wl1251_cmd_set_keys *key,
			       enum set_key_cmd cmd,
			       struct ieee80211_key_conf *mac80211_key,
			       const u8 *addr)
{
	switch (mac80211_key->alg) {
	case ALG_WEP:
		if (is_broadcast_ether_addr(addr))
			key->key_type = KEY_WEP_DEFAULT;
		else
			key->key_type = KEY_WEP_ADDR;

		mac80211_key->hw_key_idx = mac80211_key->keyidx;
		break;
	case ALG_TKIP:
		if (is_broadcast_ether_addr(addr))
			key->key_type = KEY_TKIP_MIC_GROUP;
		else
			key->key_type = KEY_TKIP_MIC_PAIRWISE;

		mac80211_key->hw_key_idx = mac80211_key->keyidx;
		break;
	case ALG_CCMP:
		if (is_broadcast_ether_addr(addr))
			key->key_type = KEY_AES_GROUP;
		else
			key->key_type = KEY_AES_PAIRWISE;
		mac80211_key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
		break;
	default:
		wl1251_error("Unknown key algo 0x%x", mac80211_key->alg);
		return -EOPNOTSUPP;
	}

	return 0;
}

static int wl1251_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
			     struct ieee80211_vif *vif,
			     struct ieee80211_sta *sta,
			     struct ieee80211_key_conf *key)
{
	struct wl1251 *wl = hw->priv;
	struct wl1251_cmd_set_keys *wl_cmd;
	const u8 *addr;
	int ret;

	static const u8 bcast_addr[ETH_ALEN] =
		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

	wl1251_debug(DEBUG_MAC80211, "mac80211 set key");

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

	addr = sta ? sta->addr : bcast_addr;

	wl1251_debug(DEBUG_CRYPT, "CMD: 0x%x", cmd);
	wl1251_dump(DEBUG_CRYPT, "ADDR: ", addr, ETH_ALEN);
	wl1251_debug(DEBUG_CRYPT, "Key: algo:0x%x, id:%d, len:%d flags 0x%x",
		     key->alg, key->keyidx, key->keylen, key->flags);
	wl1251_dump(DEBUG_CRYPT, "KEY: ", key->key, key->keylen);

	if (is_zero_ether_addr(addr)) {
		/* We dont support TX only encryption */
		ret = -EOPNOTSUPP;
		goto out;
	}

	mutex_lock(&wl->mutex);

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out_unlock;

	switch (cmd) {
	case SET_KEY:
		wl_cmd->key_action = KEY_ADD_OR_REPLACE;
		break;
	case DISABLE_KEY:
		wl_cmd->key_action = KEY_REMOVE;
		break;
	default:
		wl1251_error("Unsupported key cmd 0x%x", cmd);
		break;
	}

	ret = wl1251_set_key_type(wl, wl_cmd, cmd, key, addr);
	if (ret < 0) {
		wl1251_error("Set KEY type failed");
		goto out_sleep;
	}

	if (wl_cmd->key_type != KEY_WEP_DEFAULT)
		memcpy(wl_cmd->addr, addr, ETH_ALEN);

	if ((wl_cmd->key_type == KEY_TKIP_MIC_GROUP) ||
	    (wl_cmd->key_type == KEY_TKIP_MIC_PAIRWISE)) {
		/*
		 * 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(wl_cmd->key, key->key, 16);
		memcpy(wl_cmd->key + 16, key->key + 24, 8);
		memcpy(wl_cmd->key + 24, key->key + 16, 8);

	} else {
		memcpy(wl_cmd->key, key->key, key->keylen);
	}
	wl_cmd->key_size = key->keylen;

	wl_cmd->id = key->keyidx;
	wl_cmd->ssid_profile = 0;

	wl1251_dump(DEBUG_CRYPT, "TARGET KEY: ", wl_cmd, sizeof(*wl_cmd));

	ret = wl1251_cmd_send(wl, CMD_SET_KEYS, wl_cmd, sizeof(*wl_cmd));
	if (ret < 0) {
		wl1251_warning("could not set keys");
		goto out_sleep;
	}

out_sleep:
	wl1251_ps_elp_sleep(wl);

out_unlock:
	mutex_unlock(&wl->mutex);

out:
	kfree(wl_cmd);

	return ret;
}

static int wl1251_build_basic_rates(char *rates)
{
	u8 index = 0;

	rates[index++] = IEEE80211_BASIC_RATE_MASK | IEEE80211_CCK_RATE_1MB;
	rates[index++] = IEEE80211_BASIC_RATE_MASK | IEEE80211_CCK_RATE_2MB;
	rates[index++] = IEEE80211_BASIC_RATE_MASK | IEEE80211_CCK_RATE_5MB;
	rates[index++] = IEEE80211_BASIC_RATE_MASK | IEEE80211_CCK_RATE_11MB;

	return index;
}

static int wl1251_build_extended_rates(char *rates)
{
	u8 index = 0;

	rates[index++] = IEEE80211_OFDM_RATE_6MB;
	rates[index++] = IEEE80211_OFDM_RATE_9MB;
	rates[index++] = IEEE80211_OFDM_RATE_12MB;
	rates[index++] = IEEE80211_OFDM_RATE_18MB;
	rates[index++] = IEEE80211_OFDM_RATE_24MB;
	rates[index++] = IEEE80211_OFDM_RATE_36MB;
	rates[index++] = IEEE80211_OFDM_RATE_48MB;
	rates[index++] = IEEE80211_OFDM_RATE_54MB;

	return index;
}


static int wl1251_build_probe_req(struct wl1251 *wl, u8 *ssid, size_t ssid_len)
{
	struct wl12xx_probe_req_template template;
	struct wl12xx_ie_rates *rates;
	char *ptr;
	u16 size;

	ptr = (char *)&template;
	size = sizeof(struct ieee80211_header);

	memset(template.header.da, 0xff, ETH_ALEN);
	memset(template.header.bssid, 0xff, ETH_ALEN);
	memcpy(template.header.sa, wl->mac_addr, ETH_ALEN);
	template.header.frame_ctl = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);

	/* IEs */
	/* SSID */
	template.ssid.header.id = WLAN_EID_SSID;
	template.ssid.header.len = ssid_len;
	if (ssid_len && ssid)
		memcpy(template.ssid.ssid, ssid, ssid_len);
	size += sizeof(struct wl12xx_ie_header) + ssid_len;
	ptr += size;

	/* Basic Rates */
	rates = (struct wl12xx_ie_rates *)ptr;
	rates->header.id = WLAN_EID_SUPP_RATES;
	rates->header.len = wl1251_build_basic_rates(rates->rates);
	size += sizeof(struct wl12xx_ie_header) + rates->header.len;
	ptr += sizeof(struct wl12xx_ie_header) + rates->header.len;

	/* Extended rates */
	rates = (struct wl12xx_ie_rates *)ptr;
	rates->header.id = WLAN_EID_EXT_SUPP_RATES;
	rates->header.len = wl1251_build_extended_rates(rates->rates);
	size += sizeof(struct wl12xx_ie_header) + rates->header.len;

	wl1251_dump(DEBUG_SCAN, "PROBE REQ: ", &template, size);

	return wl1251_cmd_template_set(wl, CMD_PROBE_REQ, &template,
				      size);
}

static int wl1251_hw_scan(struct wl1251 *wl, u8 *ssid, size_t len,
			  u8 active_scan, u8 high_prio, u8 num_channels,
			  u8 probe_requests)
{
	struct wl1251_cmd_trigger_scan_to *trigger = NULL;
	struct cmd_scan *params = NULL;
	int i, ret;
	u16 scan_options = 0;

	if (wl->scanning)
		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);

	/* High priority scan */
	if (!active_scan)
		scan_options |= SCAN_PASSIVE;
	if (high_prio)
		scan_options |= SCAN_PRIORITY_HIGH;
	params->params.scan_options = scan_options;

	params->params.num_channels = num_channels;
	params->params.num_probe_requests = probe_requests;
	params->params.tx_rate = cpu_to_le16(1 << 1); /* 2 Mbps */
	params->params.tid_trigger = 0;

	for (i = 0; i < num_channels; i++) {
		params->channels[i].min_duration = cpu_to_le32(30000);
		params->channels[i].max_duration = cpu_to_le32(60000);
		memset(&params->channels[i].bssid_lsb, 0xff, 4);
		memset(&params->channels[i].bssid_msb, 0xff, 2);
		params->channels[i].early_termination = 0;
		params->channels[i].tx_power_att = 0;
		params->channels[i].channel = i + 1;
		memset(params->channels[i].pad, 0, 3);
	}

	for (i = num_channels; i < SCAN_MAX_NUM_OF_CHANNELS; i++)
		memset(&params->channels[i], 0,
		       sizeof(struct basic_scan_channel_parameters));

	if (len && ssid) {
		params->params.ssid_len = len;
		memcpy(params->params.ssid, ssid, len);
	} else {
		params->params.ssid_len = 0;
		memset(params->params.ssid, 0, 32);
	}

	ret = wl1251_build_probe_req(wl, ssid, len);
	if (ret < 0) {
		wl1251_error("PROBE request template failed");
		goto out;
	}

	trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
	if (!trigger)
		goto out;

	trigger->timeout = 0;

	ret = wl1251_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
			      sizeof(*trigger));
	if (ret < 0) {
		wl1251_error("trigger scan to failed for hw scan");
		goto out;
	}

	wl1251_dump(DEBUG_SCAN, "SCAN: ", params, sizeof(*params));

	wl->scanning = true;

	ret = wl1251_cmd_send(wl, CMD_SCAN, params, sizeof(*params));
	if (ret < 0)
		wl1251_error("SCAN failed");

	wl1251_spi_mem_read(wl, wl->cmd_box_addr, params, sizeof(*params));

	if (params->header.status != CMD_STATUS_SUCCESS) {
		wl1251_error("TEST command answer error: %d",
			     params->header.status);
		wl->scanning = false;
		ret = -EIO;
		goto out;
	}

out:
	kfree(params);
	return ret;

}

static int wl1251_op_hw_scan(struct ieee80211_hw *hw,
			     struct cfg80211_scan_request *req)
{
	struct wl1251 *wl = hw->priv;
	int ret;
	u8 *ssid = NULL;
	size_t ssid_len = 0;

	wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan");

	if (req->n_ssids) {
		ssid = req->ssids[0].ssid;
		ssid_len = req->ssids[0].ssid_len;
	}

	mutex_lock(&wl->mutex);

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	ret = wl1251_hw_scan(hw->priv, ssid, ssid_len, 1, 0, 13, 3);

	wl1251_ps_elp_sleep(wl);

out:
	mutex_unlock(&wl->mutex);

	return ret;
}

static int wl1251_op_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
	struct wl1251 *wl = hw->priv;
	int ret;

	mutex_lock(&wl->mutex);

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	ret = wl1251_acx_rts_threshold(wl, (u16) value);
	if (ret < 0)
		wl1251_warning("wl1251_op_set_rts_threshold failed: %d", ret);

	wl1251_ps_elp_sleep(wl);

out:
	mutex_unlock(&wl->mutex);

	return ret;
}

static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       struct ieee80211_bss_conf *bss_conf,
				       u32 changed)
{
	enum wl1251_cmd_ps_mode mode;
	struct wl1251 *wl = hw->priv;
	struct sk_buff *beacon;
	int ret;

	wl1251_debug(DEBUG_MAC80211, "mac80211 bss info changed");

	mutex_lock(&wl->mutex);

	ret = wl1251_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	if (changed & BSS_CHANGED_ASSOC) {
		if (bss_conf->assoc) {
			wl->aid = bss_conf->aid;

			ret = wl1251_build_ps_poll(wl, wl->aid);
			if (ret < 0)
				goto out_sleep;

			ret = wl1251_acx_aid(wl, wl->aid);
			if (ret < 0)
				goto out_sleep;

			/* If we want to go in PSM but we're not there yet */
			if (wl->psm_requested && !wl->psm) {
				mode = STATION_POWER_SAVE_MODE;
				ret = wl1251_ps_set_mode(wl, mode);
				if (ret < 0)
					goto out_sleep;
			}
		}
	}
	if (changed & BSS_CHANGED_ERP_SLOT) {
		if (bss_conf->use_short_slot)
			ret = wl1251_acx_slot(wl, SLOT_TIME_SHORT);
		else
			ret = wl1251_acx_slot(wl, SLOT_TIME_LONG);
		if (ret < 0) {
			wl1251_warning("Set slot time failed %d", ret);
			goto out_sleep;
		}
	}

	if (changed & BSS_CHANGED_ERP_PREAMBLE) {
		if (bss_conf->use_short_preamble)
			wl1251_acx_set_preamble(wl, ACX_PREAMBLE_SHORT);
		else
			wl1251_acx_set_preamble(wl, ACX_PREAMBLE_LONG);
	}

	if (changed & BSS_CHANGED_ERP_CTS_PROT) {
		if (bss_conf->use_cts_prot)
			ret = wl1251_acx_cts_protect(wl, CTSPROTECT_ENABLE);
		else
			ret = wl1251_acx_cts_protect(wl, CTSPROTECT_DISABLE);
		if (ret < 0) {
			wl1251_warning("Set ctsprotect failed %d", ret);
			goto out;
		}
	}

	if (changed & BSS_CHANGED_BSSID) {
		memcpy(wl->bssid, bss_conf->bssid, ETH_ALEN);

		ret = wl1251_build_null_data(wl);
		if (ret < 0)
			goto out;

		if (wl->bss_type != BSS_TYPE_IBSS) {
			ret = wl1251_cmd_join(wl, wl->bss_type, 5, 100, 1);
			if (ret < 0)
				goto out_sleep;
			wl1251_warning("Set ctsprotect failed %d", ret);
			goto out_sleep;
		}
	}

	if (changed & BSS_CHANGED_BEACON) {
		beacon = ieee80211_beacon_get(hw, vif);
		ret = wl1251_cmd_template_set(wl, CMD_BEACON, beacon->data,
					      beacon->len);

		if (ret < 0) {
			dev_kfree_skb(beacon);
			goto out;
		}

		ret = wl1251_cmd_template_set(wl, CMD_PROBE_RESP, beacon->data,
					      beacon->len);

		dev_kfree_skb(beacon);

		if (ret < 0)
			goto out;

		ret = wl->chip.op_cmd_join(wl, wl->bss_type, 1, 100, 0);

		if (ret < 0)
			goto out;
	}

out_sleep:
	wl1251_ps_elp_sleep(wl);

out:
	mutex_unlock(&wl->mutex);
}


/* can't be const, mac80211 writes to this */
static struct ieee80211_rate wl1251_rates[] = {
	{ .bitrate = 10,
	  .hw_value = 0x1,
	  .hw_value_short = 0x1, },
	{ .bitrate = 20,
	  .hw_value = 0x2,
	  .hw_value_short = 0x2,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55,
	  .hw_value = 0x4,
	  .hw_value_short = 0x4,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110,
	  .hw_value = 0x20,
	  .hw_value_short = 0x20,
	  .flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60,
	  .hw_value = 0x8,
	  .hw_value_short = 0x8, },
	{ .bitrate = 90,
	  .hw_value = 0x10,
	  .hw_value_short = 0x10, },
	{ .bitrate = 120,
	  .hw_value = 0x40,
	  .hw_value_short = 0x40, },
	{ .bitrate = 180,
	  .hw_value = 0x80,
	  .hw_value_short = 0x80, },
	{ .bitrate = 240,
	  .hw_value = 0x200,
	  .hw_value_short = 0x200, },
	{ .bitrate = 360,
	 .hw_value = 0x400,
	 .hw_value_short = 0x400, },
	{ .bitrate = 480,
	  .hw_value = 0x800,
	  .hw_value_short = 0x800, },
	{ .bitrate = 540,
	  .hw_value = 0x1000,
	  .hw_value_short = 0x1000, },
};

/* can't be const, mac80211 writes to this */
static struct ieee80211_channel wl1251_channels[] = {
	{ .hw_value = 1, .center_freq = 2412},
	{ .hw_value = 2, .center_freq = 2417},
	{ .hw_value = 3, .center_freq = 2422},
	{ .hw_value = 4, .center_freq = 2427},
	{ .hw_value = 5, .center_freq = 2432},
	{ .hw_value = 6, .center_freq = 2437},
	{ .hw_value = 7, .center_freq = 2442},
	{ .hw_value = 8, .center_freq = 2447},
	{ .hw_value = 9, .center_freq = 2452},
	{ .hw_value = 10, .center_freq = 2457},
	{ .hw_value = 11, .center_freq = 2462},
	{ .hw_value = 12, .center_freq = 2467},
	{ .hw_value = 13, .center_freq = 2472},
};

/* can't be const, mac80211 writes to this */
static struct ieee80211_supported_band wl1251_band_2ghz = {
	.channels = wl1251_channels,
	.n_channels = ARRAY_SIZE(wl1251_channels),
	.bitrates = wl1251_rates,
	.n_bitrates = ARRAY_SIZE(wl1251_rates),
};

static const struct ieee80211_ops wl1251_ops = {
	.start = wl1251_op_start,
	.stop = wl1251_op_stop,
	.add_interface = wl1251_op_add_interface,
	.remove_interface = wl1251_op_remove_interface,
	.config = wl1251_op_config,
	.configure_filter = wl1251_op_configure_filter,
	.tx = wl1251_op_tx,
	.set_key = wl1251_op_set_key,
	.hw_scan = wl1251_op_hw_scan,
	.bss_info_changed = wl1251_op_bss_info_changed,
	.set_rts_threshold = wl1251_op_set_rts_threshold,
};

static int wl1251_register_hw(struct wl1251 *wl)
{
	int ret;

	if (wl->mac80211_registered)
		return 0;

	SET_IEEE80211_PERM_ADDR(wl->hw, wl->mac_addr);

	ret = ieee80211_register_hw(wl->hw);
	if (ret < 0) {
		wl1251_error("unable to register mac80211 hw: %d", ret);
		return ret;
	}

	wl->mac80211_registered = true;

	wl1251_notice("loaded");

	return 0;
}

static int wl1251_init_ieee80211(struct wl1251 *wl)
{
	/* The tx descriptor buffer and the TKIP space */
	wl->hw->extra_tx_headroom = sizeof(struct tx_double_buffer_desc)
		+ WL1251_TKIP_IV_SPACE;

	/* unit us */
	/* FIXME: find a proper value */
	wl->hw->channel_change_time = 10000;

	wl->hw->flags = IEEE80211_HW_SIGNAL_DBM |
		IEEE80211_HW_NOISE_DBM;

	wl->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
	wl->hw->wiphy->max_scan_ssids = 1;
	wl->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &wl1251_band_2ghz;

	SET_IEEE80211_DEV(wl->hw, &wl->spi->dev);

	return 0;
}

#define WL1251_DEFAULT_CHANNEL 1
static int __devinit wl1251_probe(struct spi_device *spi)
{
	struct wl12xx_platform_data *pdata;
	struct ieee80211_hw *hw;
	struct wl1251 *wl;
	int ret, i;
	static const u8 nokia_oui[3] = {0x00, 0x1f, 0xdf};

	pdata = spi->dev.platform_data;
	if (!pdata) {
		wl1251_error("no platform data");
		return -ENODEV;
	}

	hw = ieee80211_alloc_hw(sizeof(*wl), &wl1251_ops);
	if (!hw) {
		wl1251_error("could not alloc ieee80211_hw");
		return -ENOMEM;
	}

	wl = hw->priv;
	memset(wl, 0, sizeof(*wl));

	wl->hw = hw;
	dev_set_drvdata(&spi->dev, wl);
	wl->spi = spi;

	wl->data_in_count = 0;

	skb_queue_head_init(&wl->tx_queue);

	INIT_WORK(&wl->filter_work, wl1251_filter_work);
	wl->channel = WL1251_DEFAULT_CHANNEL;
	wl->scanning = false;
	wl->default_key = 0;
	wl->listen_int = 1;
	wl->rx_counter = 0;
	wl->rx_handled = 0;
	wl->rx_current_buffer = 0;
	wl->rx_last_id = 0;
	wl->rx_config = WL1251_DEFAULT_RX_CONFIG;
	wl->rx_filter = WL1251_DEFAULT_RX_FILTER;
	wl->elp = false;
	wl->psm = 0;
	wl->psm_requested = false;
	wl->tx_queue_stopped = false;
	wl->power_level = WL1251_DEFAULT_POWER_LEVEL;

	/* We use the default power on sleep time until we know which chip
	 * we're using */
	wl->chip.power_on_sleep = WL1251_DEFAULT_POWER_ON_SLEEP;

	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
		wl->tx_frames[i] = NULL;

	wl->next_tx_complete = 0;

	/*
	 * In case our MAC address is not correctly set,
	 * we use a random but Nokia MAC.
	 */
	memcpy(wl->mac_addr, nokia_oui, 3);
	get_random_bytes(wl->mac_addr + 3, 3);

	wl->state = WL1251_STATE_OFF;
	mutex_init(&wl->mutex);

	wl->tx_mgmt_frm_rate = DEFAULT_HW_GEN_TX_RATE;
	wl->tx_mgmt_frm_mod = DEFAULT_HW_GEN_MODULATION_TYPE;

	wl->rx_descriptor = kmalloc(sizeof(*wl->rx_descriptor), GFP_KERNEL);
	if (!wl->rx_descriptor) {
		wl1251_error("could not allocate memory for rx descriptor");
		ret = -ENOMEM;
		goto out_free;
	}

	/* This is the only SPI value that we need to set here, the rest
	 * comes from the board-peripherals file */
	spi->bits_per_word = 32;

	ret = spi_setup(spi);
	if (ret < 0) {
		wl1251_error("spi_setup failed");
		goto out_free;
	}

	wl->set_power = pdata->set_power;
	if (!wl->set_power) {
		wl1251_error("set power function missing in platform data");
		ret = -ENODEV;
		goto out_free;
	}

	wl->irq = spi->irq;
	if (wl->irq < 0) {
		wl1251_error("irq missing in platform data");
		ret = -ENODEV;
		goto out_free;
	}

	ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
	if (ret < 0) {
		wl1251_error("request_irq() failed: %d", ret);
		goto out_free;
	}

	set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

	disable_irq(wl->irq);

	ret = wl1251_init_ieee80211(wl);
	if (ret)
		goto out_irq;

	ret = wl1251_register_hw(wl);
	if (ret)
		goto out_irq;

	wl1251_debugfs_init(wl);

	wl1251_notice("initialized");

	return 0;

 out_irq:
	free_irq(wl->irq, wl);

 out_free:
	kfree(wl->rx_descriptor);
	wl->rx_descriptor = NULL;

	ieee80211_free_hw(hw);

	return ret;
}

static int __devexit wl1251_remove(struct spi_device *spi)
{
	struct wl1251 *wl = dev_get_drvdata(&spi->dev);

	ieee80211_unregister_hw(wl->hw);

	wl1251_debugfs_exit(wl);

	free_irq(wl->irq, wl);
	kfree(wl->target_mem_map);
	kfree(wl->data_path);
	kfree(wl->fw);
	wl->fw = NULL;
	kfree(wl->nvs);
	wl->nvs = NULL;

	kfree(wl->rx_descriptor);
	wl->rx_descriptor = NULL;

	ieee80211_free_hw(wl->hw);

	return 0;
}


static struct spi_driver wl1251_spi_driver = {
	.driver = {
		/* FIXME: use wl12xx name to not break the user space */
		.name		= "wl12xx",
		.bus		= &spi_bus_type,
		.owner		= THIS_MODULE,
	},

	.probe		= wl1251_probe,
	.remove		= __devexit_p(wl1251_remove),
};

static int __init wl1251_init(void)
{
	int ret;

	ret = spi_register_driver(&wl1251_spi_driver);
	if (ret < 0) {
		wl1251_error("failed to register spi driver: %d", ret);
		goto out;
	}

out:
	return ret;
}

static void __exit wl1251_exit(void)
{
	spi_unregister_driver(&wl1251_spi_driver);

	wl1251_notice("unloaded");
}

module_init(wl1251_init);
module_exit(wl1251_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kalle Valo <Kalle.Valo@nokia.com>, "
		"Luciano Coelho <luciano.coelho@nokia.com>");