package/ath9k/src/drivers/net/wireless/ath9k/main.c


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/*
 * Copyright (c) 2008 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* mac80211 and PCI callbacks */

#include <linux/nl80211.h>
#include "core.h"

#define ATH_PCI_VERSION "0.1"

#define IEEE80211_HTCAP_MAXRXAMPDU_FACTOR	13
#define IEEE80211_ACTION_CAT_HT			7
#define IEEE80211_ACTION_HT_TXCHWIDTH		0

static char *dev_info = "ath9k";

MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Support for Atheros 802.11n wireless LAN cards.");
MODULE_SUPPORTED_DEVICE("Atheros 802.11n WLAN cards");
MODULE_LICENSE("Dual BSD/GPL");

static struct pci_device_id ath_pci_id_table[] __devinitdata = {
	{ PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */
	{ 0 }
};

static int test_update_chan(enum ieee80211_band band,
			    const struct hal_channel *chan,
			    struct ath_softc *sc)
{
	int i;

	for (i = 0; i < sc->sbands[band].n_channels; i++) {
		if (sc->channels[band][i].center_freq == chan->channel)
			return 1;
	}

	return 0;
}

static int ath_check_chanflags(struct ieee80211_channel *chan,
			       u_int32_t mode,
			       struct ath_softc *sc)
{
	struct ieee80211_hw *hw = sc->hw;
	struct ieee80211_supported_band *band;
	struct ieee80211_channel *band_channel;
	int i;

	band = hw->wiphy->bands[chan->band];

	for (i = 0; i < band->n_channels; i++) {
		band_channel = &band->channels[i];

		if ((band_channel->center_freq == chan->center_freq) &&
		    ((band_channel->hw_value & mode) == mode))
			return 1;
	}
	return 0;
}

static int ath_setkey_tkip(struct ath_softc *sc,
			   struct ieee80211_key_conf *key,
			   struct hal_keyval *hk,
			   const u8 *addr)
{
	u8 *key_rxmic = NULL;
	u8 *key_txmic = NULL;

	key_txmic = key->key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key_rxmic = key->key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;

	if (addr == NULL) {
		/* Group key installation */
		memcpy(hk->kv_mic,  key_rxmic, sizeof(hk->kv_mic));
		return ath_keyset(sc, key->keyidx, hk, addr);
	}
	if (!sc->sc_splitmic) {
		/*
		 * data key goes at first index,
		 * the hal handles the MIC keys at index+64.
		 */
		memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
		memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
		return ath_keyset(sc, key->keyidx, hk, addr);
	}
	/*
	 * TX key goes at first index, RX key at +32.
	 * The hal handles the MIC keys at index+64.
	 */
	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
	if (!ath_keyset(sc, key->keyidx, hk, NULL)) {
		/* Txmic entry failed. No need to proceed further */
		DPRINTF(sc, ATH_DEBUG_KEYCACHE,
			"%s Setting TX MIC Key Failed\n", __func__);
		return 0;
	}

	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	/* XXX delete tx key on failure? */
	return ath_keyset(sc, key->keyidx+32, hk, addr);
}

static int ath_key_config(struct ath_softc *sc,
			  const u8 *addr,
			  struct ieee80211_key_conf *key)
{
	struct ieee80211_vif *vif;
	struct hal_keyval hk;
	const u8 *mac = NULL;
	int ret = 0;
	enum ieee80211_if_types opmode;

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

	switch (key->alg) {
	case ALG_WEP:
		hk.kv_type = HAL_CIPHER_WEP;
		break;
	case ALG_TKIP:
		hk.kv_type = HAL_CIPHER_TKIP;
		break;
	case ALG_CCMP:
		hk.kv_type = HAL_CIPHER_AES_CCM;
		break;
	default:
		return -EINVAL;
	}

	hk.kv_len  = key->keylen;
	memcpy(hk.kv_val, key->key, key->keylen);

	if (!sc->sc_vaps[0])
		return -EIO;

	vif = sc->sc_vaps[0]->av_if_data;
	opmode = vif->type;

	/*
	 *  Strategy:
	 *   For _M_STA mc tx, we will not setup a key at all since we never
	 *   tx mc.
	 *   _M_STA mc rx, we will use the keyID.
	 *   for _M_IBSS mc tx, we will use the keyID, and no macaddr.
	 *   for _M_IBSS mc rx, we will alloc a slot and plumb the mac of the
	 *   peer node. BUT we will plumb a cleartext key so that we can do
	 *   perSta default key table lookup in software.
	 */
	if (is_broadcast_ether_addr(addr)) {
		switch (opmode) {
		case IEEE80211_IF_TYPE_STA:
			/* default key:  could be group WPA key
			 * or could be static WEP key */
			mac = NULL;
			break;
		case IEEE80211_IF_TYPE_IBSS:
			break;
		case IEEE80211_IF_TYPE_AP:
			break;
		default:
			ASSERT(0);
			break;
		}
	} else {
		mac = addr;
	}

	if (key->alg == ALG_TKIP)
		ret = ath_setkey_tkip(sc, key, &hk, mac);
	else
		ret = ath_keyset(sc, key->keyidx, &hk, mac);

	if (!ret)
		return -EIO;

	sc->sc_keytype = hk.kv_type;
	return 0;
}

static void ath_key_delete(struct ath_softc *sc, struct ieee80211_key_conf *key)
{
#define ATH_MAX_NUM_KEYS 4
	int freeslot;

	freeslot = (key->keyidx >= ATH_MAX_NUM_KEYS) ? 1 : 0;
	ath_key_reset(sc, key->keyidx, freeslot);
#undef ATH_MAX_NUM_KEYS
}

static void setup_ht_cap(struct ieee80211_ht_info *ht_info)
{
/* Until mac80211 includes these fields */

#define IEEE80211_HT_CAP_DSSSCCK40 0x1000
#define	IEEE80211_HT_CAP_MAXRXAMPDU_65536 0x3   /* 2 ^ 16 */
#define	IEEE80211_HT_CAP_MPDUDENSITY_8 0x6     	/* 8 usec */

	ht_info->ht_supported = 1;
	ht_info->cap = (u16)IEEE80211_HT_CAP_SUP_WIDTH
			|(u16)IEEE80211_HT_CAP_MIMO_PS
			|(u16)IEEE80211_HT_CAP_SGI_40
			|(u16)IEEE80211_HT_CAP_DSSSCCK40;

	ht_info->ampdu_factor = IEEE80211_HT_CAP_MAXRXAMPDU_65536;
	ht_info->ampdu_density = IEEE80211_HT_CAP_MPDUDENSITY_8;
	/* setup supported mcs set */
	memset(ht_info->supp_mcs_set, 0, 16);
	ht_info->supp_mcs_set[0] = 0xff;
	ht_info->supp_mcs_set[1] = 0xff;
	ht_info->supp_mcs_set[12] = IEEE80211_HT_CAP_MCS_TX_DEFINED;
}

static int ath_rate2idx(struct ath_softc *sc, int rate)
{
	int i = 0, cur_band, n_rates;
	struct ieee80211_hw *hw = sc->hw;

	cur_band = hw->conf.channel->band;
	n_rates = sc->sbands[cur_band].n_bitrates;

	for (i = 0; i < n_rates; i++) {
		if (sc->sbands[cur_band].bitrates[i].bitrate == rate)
			break;
	}

	/*
	 * NB:mac80211 validates rx rate index against the supported legacy rate
	 * index only (should be done against ht rates also), return the highest
	 * legacy rate index for rx rate which does not match any one of the
	 * supported basic and extended rates to make mac80211 happy.
	 * The following hack will be cleaned up once the issue with
	 * the rx rate index validation in mac80211 is fixed.
	 */
	if (i == n_rates)
		return n_rates - 1;
	return i;
}

static void ath9k_rx_prepare(struct ath_softc *sc,
			     struct sk_buff *skb,
			     struct ath_recv_status *status,
			     struct ieee80211_rx_status *rx_status)
{
	struct ieee80211_hw *hw = sc->hw;
	struct ieee80211_channel *curchan = hw->conf.channel;

	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));

	rx_status->mactime = status->tsf;
	rx_status->band = curchan->band;
	rx_status->freq =  curchan->center_freq;
	rx_status->signal = (status->rssi * 64) / 100;
	rx_status->noise = ATH_DEFAULT_NOISE_FLOOR;
	rx_status->rate_idx = ath_rate2idx(sc, (status->rateKbps / 100));
	rx_status->antenna = status->antenna;

	if (status->flags & ATH_RX_MIC_ERROR)
		rx_status->flag |= RX_FLAG_MMIC_ERROR;
	if (status->flags & ATH_RX_FCS_ERROR)
		rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;

	rx_status->flag |= RX_FLAG_TSFT;
}

/*
 * Update all associated nodes and VAPs
 *
 * Called when local channel width changed.  e.g. if AP mode,
 * update all associated STAs when the AP's channel width changes.
 */
static void cwm_rate_updateallnodes(struct ath_softc *sc)
{
	int flags = 0, error;