/* IEEE 802.11 SoftMAC layer
 * Copyright (c) 2005 Andrea Merello <andrea.merello@gmail.com>
 *
 * Mostly extracted from the rtl8180-sa2400 driver for the
 * in-kernel generic ieee802.11 stack.
 *
 * Some pieces of code might be stolen from ipw2100 driver
 * copyright of who own it's copyright ;-)
 *
 * PS wx handler mostly stolen from hostap, copyright who
 * own it's copyright ;-)
 *
 * released under the GPL
 */


#include <linux/etherdevice.h>

#include "ieee80211.h"

/* FIXME: add A freqs */

const long ieee80211_wlan_frequencies[] = {
	2412, 2417, 2422, 2427,
	2432, 2437, 2442, 2447,
	2452, 2457, 2462, 2467,
	2472, 2484
};


int ieee80211_wx_set_freq(struct ieee80211_device *ieee,
			  struct iw_request_info *a, union iwreq_data *wrqu,
			  char *b)
{
	int ret;
	struct iw_freq *fwrq = &wrqu->freq;
//	printk("in %s\n",__func__);
	down(&ieee->wx_sem);

	if (ieee->iw_mode == IW_MODE_INFRA) {
		ret = -EOPNOTSUPP;
		goto out;
	}

	/* if setting by freq convert to channel */
	if (fwrq->e == 1) {
		if ((fwrq->m >= (int) 2.412e8 &&
		     fwrq->m <= (int) 2.487e8)) {
			int f = fwrq->m / 100000;
			int c = 0;

			while ((c < 14) && (f != ieee80211_wlan_frequencies[c]))
				c++;

			/* hack to fall through */
			fwrq->e = 0;
			fwrq->m = c + 1;
		}
	}

	if (fwrq->e > 0 || fwrq->m > 14 || fwrq->m < 1) {
		ret = -EOPNOTSUPP;
		goto out;

	} else { /* Set the channel */


		ieee->current_network.channel = fwrq->m;
		ieee->set_chan(ieee->dev, ieee->current_network.channel);

		if (ieee->iw_mode == IW_MODE_ADHOC || ieee->iw_mode == IW_MODE_MASTER)
			if (ieee->state == IEEE80211_LINKED) {
				ieee80211_stop_send_beacons(ieee);
				ieee80211_start_send_beacons(ieee);
			}
	}

	ret = 0;
out:
	up(&ieee->wx_sem);
	return ret;
}


int ieee80211_wx_get_freq(struct ieee80211_device *ieee,
			  struct iw_request_info *a, union iwreq_data *wrqu,
			  char *b)
{
	struct iw_freq *fwrq = &wrqu->freq;

	if (ieee->current_network.channel == 0)
		return -1;

	fwrq->m = ieee->current_network.channel;
	fwrq->e = 0;

	return 0;
}

int ieee80211_wx_get_wap(struct ieee80211_device *ieee,
			 struct iw_request_info *info, union iwreq_data *wrqu,
			 char *extra)
{
	unsigned long flags;

	wrqu->ap_addr.sa_family = ARPHRD_ETHER;

	if (ieee->iw_mode == IW_MODE_MONITOR)
		return -1;

	/* We want avoid to give to the user inconsistent infos*/
	spin_lock_irqsave(&ieee->lock, flags);

	if (ieee->state != IEEE80211_LINKED &&
		ieee->state != IEEE80211_LINKED_SCANNING &&
		ieee->wap_set == 0)

		memset(wrqu->ap_addr.sa_data, 0, ETH_ALEN);
	else
		memcpy(wrqu->ap_addr.sa_data,
		       ieee->current_network.bssid, ETH_ALEN);

	spin_unlock_irqrestore(&ieee->lock, flags);

	return 0;
}


int ieee80211_wx_set_wap(struct ieee80211_device *ieee,
			 struct iw_request_info *info, union iwreq_data *awrq,
			 char *extra)
{

	int ret = 0;
	unsigned long flags;

	short ifup = ieee->proto_started;//dev->flags & IFF_UP;
	struct sockaddr *temp = (struct sockaddr *)awrq;

	//printk("=======Set WAP:");
	ieee->sync_scan_hurryup = 1;

	down(&ieee->wx_sem);
	/* use ifconfig hw ether */
	if (ieee->iw_mode == IW_MODE_MASTER) {
		ret = -1;
		goto out;
	}

	if (temp->sa_family != ARPHRD_ETHER) {
		ret = -EINVAL;
		goto out;
	}

	if (ifup)
		ieee80211_stop_protocol(ieee);

	/* just to avoid to give inconsistent infos in the
	 * get wx method. not really needed otherwise
	 */
	spin_lock_irqsave(&ieee->lock, flags);

	memcpy(ieee->current_network.bssid, temp->sa_data, ETH_ALEN);
	ieee->wap_set = !is_zero_ether_addr(temp->sa_data);
	//printk(" %x:%x:%x:%x:%x:%x\n", ieee->current_network.bssid[0],ieee->current_network.bssid[1],ieee->current_network.bssid[2],ieee->current_network.bssid[3],ieee->current_network.bssid[4],ieee->current_network.bssid[5]);

	spin_unlock_irqrestore(&ieee->lock, flags);

	if (ifup)
		ieee80211_start_protocol(ieee);

out:
	up(&ieee->wx_sem);
	return ret;
}

int ieee80211_wx_get_essid(struct ieee80211_device *ieee,
			   struct iw_request_info *a, union iwreq_data *wrqu,
			   char *b)
{
	int len, ret = 0;
	unsigned long flags;

	if (ieee->iw_mode == IW_MODE_MONITOR)
		return -1;

	/* We want avoid to give to the user inconsistent infos*/
	spin_lock_irqsave(&ieee->lock, flags);

	if (ieee->current_network.ssid[0] == '\0' ||
		ieee->current_network.ssid_len == 0){
		ret = -1;
		goto out;
	}

	if (ieee->state != IEEE80211_LINKED &&
		ieee->state != IEEE80211_LINKED_SCANNING &&
		ieee->ssid_set == 0){
		ret = -1;
		goto out;
	}
	len = ieee->current_network.ssid_len;
	wrqu->essid.length = len;
	strncpy(b, ieee->current_network.ssid, len);
	wrqu->essid.flags = 1;

out:
	spin_unlock_irqrestore(&ieee->lock, flags);

	return ret;

}

int ieee80211_wx_set_rate(struct ieee80211_device *ieee,
			  struct iw_request_info *info, union iwreq_data *wrqu,
			  char *extra)
{

	u32 target_rate = wrqu->bitrate.value;

	//added by lizhaoming for auto mode
	if (target_rate == -1)
		ieee->rate = 110;
	else
		ieee->rate = target_rate/100000;

	//FIXME: we might want to limit rate also in management protocols.
	return 0;
}


int ieee80211_wx_get_rate(struct ieee80211_device *ieee,
			  struct iw_request_info *info, union iwreq_data *wrqu,
			  char *extra)
{

	wrqu->bitrate.value = ieee->rate * 100000;

	return 0;
}

int ieee80211_wx_set_mode(struct ieee80211_device *ieee,
			  struct iw_request_info *a, union iwreq_data *wrqu,
			  char *b)
{

	ieee->sync_scan_hurryup = 1;

	down(&ieee->wx_sem);

	if (wrqu->mode == ieee->iw_mode)
		goto out;

	if (wrqu->mode == IW_MODE_MONITOR)
		ieee->dev->type = ARPHRD_IEEE80211;
	else
		ieee->dev->type = ARPHRD_ETHER;

	if (!ieee->proto_started) {
		ieee->iw_mode = wrqu->mode;
	} else {
		ieee80211_stop_protocol(ieee);
		ieee->iw_mode = wrqu->mode;
		ieee80211_start_protocol(ieee);
	}

out:
	up(&ieee->wx_sem);
	return 0;
}


void ieee80211_wx_sync_scan_wq(struct work_struct *work)
{
	struct ieee80211_device *ieee = container_of(work, struct ieee80211_device, wx_sync_scan_wq);
	short chan;

	chan = ieee->current_network.channel;

	if (ieee->data_hard_stop)
		ieee->data_hard_stop(ieee->dev);

	ieee80211_stop_send_beacons(ieee);

	ieee->state = IEEE80211_LINKED_SCANNING;
	ieee->link_change(ieee->dev);

	ieee80211_start_scan_syncro(ieee);

	ieee->set_chan(ieee->dev, chan);

	ieee->state = IEEE80211_LINKED;
	ieee->link_change(ieee->dev);

	if (ieee->data_hard_resume)
		ieee->data_hard_resume(ieee->dev);

	if (ieee->iw_mode == IW_MODE_ADHOC || ieee->iw_mode == IW_MODE_MASTER)
		ieee80211_start_send_beacons(ieee);

	//YJ,add,080828, In prevent of lossing ping packet during scanning
	//ieee80211_sta_ps_send_null_frame(ieee, false);
	//YJ,add,080828,end

	up(&ieee->wx_sem);

}

int ieee80211_wx_set_scan(struct ieee80211_device *ieee,
			  struct iw_request_info *a, union iwreq_data *wrqu,
			  char *b)
{
	int ret = 0;

	down(&ieee->wx_sem);

	if (ieee->iw_mode == IW_MODE_MONITOR || !(ieee->proto_started)) {
		ret = -1;
		goto out;
	}
	//YJ,add,080828
	//In prevent of lossing ping packet during scanning
	//ieee80211_sta_ps_send_null_frame(ieee, true);
	//YJ,add,080828,end

	if (ieee->state == IEEE80211_LINKED) {
		queue_work(ieee->wq, &ieee->wx_sync_scan_wq);
		/* intentionally forget to up sem */
		return 0;
	}

out:
	up(&ieee->wx_sem);
	return ret;
}

int ieee80211_wx_set_essid(struct ieee80211_device *ieee,
			   struct iw_request_info *a, union iwreq_data *wrqu,
			   char *extra)
{

	int ret = 0, len;
	short proto_started;
	unsigned long flags;

	ieee->sync_scan_hurryup = 1;

	down(&ieee->wx_sem);

	proto_started = ieee->proto_started;

	if (wrqu->essid.length > IW_ESSID_MAX_SIZE) {
		ret = -E2BIG;
		goto out;
	}

	if (ieee->iw_mode == IW_MODE_MONITOR) {
		ret = -1;
		goto out;
	}

	if (proto_started)
		ieee80211_stop_protocol(ieee);

	/* this is just to be sure that the GET wx callback
	 * has consistent infos. not needed otherwise
	 */
	spin_lock_irqsave(&ieee->lock, flags);

	if (wrqu->essid.flags && wrqu->essid.length) {
//YJ,modified,080819
		len = (wrqu->essid.length < IW_ESSID_MAX_SIZE) ? (wrqu->essid.length) : IW_ESSID_MAX_SIZE;
		memset(ieee->current_network.ssid, 0, ieee->current_network.ssid_len); //YJ,add,080819
		strncpy(ieee->current_network.ssid, extra, len);
		ieee->current_network.ssid_len = len;
		ieee->ssid_set = 1;
//YJ,modified,080819,end

		//YJ,add,080819,for hidden ap
		if (len == 0) {
			memset(ieee->current_network.bssid, 0, ETH_ALEN);
			ieee->current_network.capability = 0;
		}
		//YJ,add,080819,for hidden ap,end
	} else {
		ieee->ssid_set = 0;
		ieee->current_network.ssid[0] = '\0';
		ieee->current_network.ssid_len = 0;
	}
	//printk("==========set essid %s!\n",ieee->current_network.ssid);
	spin_unlock_irqrestore(&ieee->lock, flags);

	if (proto_started)
		ieee80211_start_protocol(ieee);
out:
	up(&ieee->wx_sem);
	return ret;
}

int ieee80211_wx_get_mode(struct ieee80211_device *ieee,
			  struct iw_request_info *a, union iwreq_data *wrqu,
			  char *b)
{

	wrqu->mode = ieee->iw_mode;
	return 0;
}

int ieee80211_wx_set_rawtx(struct ieee80211_device *ieee,
			   struct iw_request_info *info, union iwreq_data *wrqu,
			   char *extra)
{

	int *parms = (int *)extra;
	int enable = (parms[0] > 0);
	short prev = ieee->raw_tx;

	down(&ieee->wx_sem);

	if (enable)
		ieee->raw_tx = 1;
	else
		ieee->raw_tx = 0;

	netdev_info(ieee->dev, "raw TX is %s\n",
		    ieee->raw_tx ? "enabled" : "disabled");

	if (ieee->iw_mode == IW_MODE_MONITOR) {
		if (prev == 0 && ieee->raw_tx) {
			if (ieee->data_hard_resume)
				ieee->data_hard_resume(ieee->dev);

			netif_carrier_on(ieee->dev);
		}

		if (prev && ieee->raw_tx == 1)
			netif_carrier_off(ieee->dev);
	}

	up(&ieee->wx_sem);

	return 0;
}

int ieee80211_wx_get_name(struct ieee80211_device *ieee,
			  struct iw_request_info *info, union iwreq_data *wrqu,
			  char *extra)
{
	strlcpy(wrqu->name, "802.11", IFNAMSIZ);
	if (ieee->modulation & IEEE80211_CCK_MODULATION) {
		strlcat(wrqu->name, "b", IFNAMSIZ);
		if (ieee->modulation & IEEE80211_OFDM_MODULATION)
			strlcat(wrqu->name, "/g", IFNAMSIZ);
	} else if (ieee->modulation & IEEE80211_OFDM_MODULATION)
		strlcat(wrqu->name, "g", IFNAMSIZ);

	if ((ieee->state == IEEE80211_LINKED) ||
		(ieee->state == IEEE80211_LINKED_SCANNING))
		strlcat(wrqu->name, "  link", IFNAMSIZ);
	else if (ieee->state != IEEE80211_NOLINK)
		strlcat(wrqu->name, " .....", IFNAMSIZ);


	return 0;
}


/* this is mostly stolen from hostap */
int ieee80211_wx_set_power(struct ieee80211_device *ieee,
			   struct iw_request_info *info, union iwreq_data *wrqu,
			   char *extra)
{
	int ret = 0;

	if ((!ieee->sta_wake_up) ||
	    (!ieee->ps_request_tx_ack) ||
	    (!ieee->enter_sleep_state) ||
	    (!ieee->ps_is_queue_empty)) {

		printk("ERROR. PS mode tried to be use but driver missed a callback\n\n");

		return -1;
	}

	down(&ieee->wx_sem);

	if (wrqu->power.disabled) {
		ieee->ps = IEEE80211_PS_DISABLED;

		goto exit;
	}
	switch (wrqu->power.flags & IW_POWER_MODE) {
	case IW_POWER_UNICAST_R:
		ieee->ps = IEEE80211_PS_UNICAST;

		break;
	case IW_POWER_ALL_R:
		ieee->ps = IEEE80211_PS_UNICAST | IEEE80211_PS_MBCAST;
		break;

	case IW_POWER_ON:
		ieee->ps = IEEE80211_PS_DISABLED;
		break;

	default:
		ret = -EINVAL;
		goto exit;
	}

	if (wrqu->power.flags & IW_POWER_TIMEOUT) {

		ieee->ps_timeout = wrqu->power.value / 1000;
		printk("Timeout %d\n", ieee->ps_timeout);
	}

	if (wrqu->power.flags & IW_POWER_PERIOD) {

		ret = -EOPNOTSUPP;
		goto exit;
		//wrq->value / 1024;

	}
exit:
	up(&ieee->wx_sem);
	return ret;

}

/* this is stolen from hostap */
int ieee80211_wx_get_power(struct ieee80211_device *ieee,
			   struct iw_request_info *info, union iwreq_data *wrqu,
			   char *extra)
{
	int ret = 0;

	down(&ieee->wx_sem);

	if (ieee->ps == IEEE80211_PS_DISABLED) {
		wrqu->power.disabled = 1;
		goto exit;
	}

	wrqu->power.disabled = 0;

//	if ((wrqu->power.flags & IW_POWER_TYPE) == IW_POWER_TIMEOUT) {
		wrqu->power.flags = IW_POWER_TIMEOUT;
		wrqu->power.value = ieee->ps_timeout * 1000;
//	} else {
//		ret = -EOPNOTSUPP;
//		goto exit;
		//wrqu->power.flags = IW_POWER_PERIOD;
		//wrqu->power.value = ieee->current_network.dtim_period *
		//	ieee->current_network.beacon_interval * 1024;
//	}


	if (ieee->ps & IEEE80211_PS_MBCAST)
		wrqu->power.flags |= IW_POWER_ALL_R;
	else
		wrqu->power.flags |= IW_POWER_UNICAST_R;

exit:
	up(&ieee->wx_sem);
	return ret;

}