[RT2x00]: add driver for Ralink wireless hardware

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1133 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
new file mode 100644
index 000000000000..cd82eeface8f
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -0,0 +1,1133 @@
+/*
+	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	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.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: rt2x00lib
+	Abstract: rt2x00 generic device routines.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00lib"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+/*
+ * Ring handler.
+ */
+struct data_ring *rt2x00lib_get_ring(struct rt2x00_dev *rt2x00dev,
+				     const unsigned int queue)
+{
+	int beacon = test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags);
+
+	/*
+	 * Check if we are requesting a reqular TX ring,
+	 * or if we are requesting a Beacon or Atim ring.
+	 * For Atim rings, we should check if it is supported.
+	 */
+	if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
+		return &rt2x00dev->tx[queue];
+
+	if (!rt2x00dev->bcn || !beacon)
+		return NULL;
+
+	if (queue == IEEE80211_TX_QUEUE_BEACON)
+		return &rt2x00dev->bcn[0];
+	else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
+		return &rt2x00dev->bcn[1];
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
+
+/*
+ * Link tuning handlers
+ */
+static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
+{
+	rt2x00_clear_link(&rt2x00dev->link);
+
+	/*
+	 * Reset the link tuner.
+	 */
+	rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
+
+	queue_delayed_work(rt2x00dev->hw->workqueue,
+			   &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
+}
+
+static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
+{
+	if (delayed_work_pending(&rt2x00dev->link.work))
+		cancel_rearming_delayed_work(&rt2x00dev->link.work);
+}
+
+void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
+{
+	rt2x00lib_stop_link_tuner(rt2x00dev);
+	rt2x00lib_start_link_tuner(rt2x00dev);
+}
+
+/*
+ * Radio control handlers.
+ */
+int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
+{
+	int status;
+
+	/*
+	 * Don't enable the radio twice.
+	 * And check if the hardware button has been disabled.
+	 */
+	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
+	    (test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags) &&
+	     !test_bit(DEVICE_ENABLED_RADIO_HW, &rt2x00dev->flags)))
+		return 0;
+
+	/*
+	 * Enable radio.
+	 */
+	status = rt2x00dev->ops->lib->set_device_state(rt2x00dev,
+						       STATE_RADIO_ON);
+	if (status)
+		return status;
+
+	__set_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags);
+
+	/*
+	 * Enable RX.
+	 */
+	rt2x00lib_toggle_rx(rt2x00dev, 1);
+
+	/*
+	 * Start the TX queues.
+	 */
+	ieee80211_start_queues(rt2x00dev->hw);
+
+	return 0;
+}
+
+void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
+{
+	if (!__test_and_clear_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+		return;
+
+	/*
+	 * Stop beacon generation.
+	 */
+	if (work_pending(&rt2x00dev->beacon_work))
+		cancel_work_sync(&rt2x00dev->beacon_work);
+
+	/*
+	 * Stop the TX queues.
+	 */
+	ieee80211_stop_queues(rt2x00dev->hw);
+
+	/*
+	 * Disable RX.
+	 */
+	rt2x00lib_toggle_rx(rt2x00dev, 0);
+
+	/*
+	 * Disable radio.
+	 */
+	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
+}
+
+void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, int enable)
+{
+	enum dev_state state = enable ? STATE_RADIO_RX_ON : STATE_RADIO_RX_OFF;
+
+	/*
+	 * When we are disabling the RX, we should also stop the link tuner.
+	 */
+	if (!enable)
+		rt2x00lib_stop_link_tuner(rt2x00dev);
+
+	rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
+
+	/*
+	 * When we are enabling the RX, we should also start the link tuner.
+	 */
+	if (enable && is_interface_present(&rt2x00dev->interface))
+		rt2x00lib_start_link_tuner(rt2x00dev);
+}
+
+static void rt2x00lib_precalculate_link_signal(struct link *link)
+{
+	if (link->rx_failed || link->rx_success)
+		link->rx_percentage =
+		    (link->rx_success * 100) /
+		    (link->rx_failed + link->rx_success);
+	else
+		link->rx_percentage = 50;
+
+	if (link->tx_failed || link->tx_success)
+		link->tx_percentage =
+		    (link->tx_success * 100) /
+		    (link->tx_failed + link->tx_success);
+	else
+		link->tx_percentage = 50;
+
+	link->rx_success = 0;
+	link->rx_failed = 0;
+	link->tx_success = 0;
+	link->tx_failed = 0;
+}
+
+static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
+					   int rssi)
+{
+	int rssi_percentage = 0;
+	int signal;
+
+	/*
+	 * We need a positive value for the RSSI.
+	 */
+	if (rssi < 0)
+		rssi += rt2x00dev->rssi_offset;
+
+	/*
+	 * Calculate the different percentages,
+	 * which will be used for the signal.
+	 */
+	if (rt2x00dev->rssi_offset)
+		rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
+
+	/*
+	 * Add the individual percentages and use the WEIGHT
+	 * defines to calculate the current link signal.
+	 */
+	signal = ((WEIGHT_RSSI * rssi_percentage) +
+		  (WEIGHT_TX * rt2x00dev->link.tx_percentage) +
+		  (WEIGHT_RX * rt2x00dev->link.rx_percentage)) / 100;
+
+	return (signal > 100) ? 100 : signal;
+}
+
+static void rt2x00lib_link_tuner(struct work_struct *work)
+{
+	struct rt2x00_dev *rt2x00dev =
+	    container_of(work, struct rt2x00_dev, link.work.work);
+
+	/*
+	 * Update statistics.
+	 */
+	rt2x00dev->ops->lib->link_stats(rt2x00dev);
+
+	rt2x00dev->low_level_stats.dot11FCSErrorCount +=
+	    rt2x00dev->link.rx_failed;
+
+	rt2x00lib_precalculate_link_signal(&rt2x00dev->link);
+
+	/*
+	 * Only perform the link tuning when Link tuning
+	 * has been enabled (This could have been disabled from the EEPROM).
+	 */
+	if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
+		rt2x00dev->ops->lib->link_tuner(rt2x00dev);
+
+	/*
+	 * Increase tuner counter, and reschedule the next link tuner run.
+	 */
+	rt2x00dev->link.count++;
+	queue_delayed_work(rt2x00dev->hw->workqueue, &rt2x00dev->link.work,
+			   LINK_TUNE_INTERVAL);
+}
+
+/*
+ * Interrupt context handlers.
+ */
+static void rt2x00lib_beacondone_scheduled(struct work_struct *work)
+{
+	struct rt2x00_dev *rt2x00dev =
+	    container_of(work, struct rt2x00_dev, beacon_work);
+	struct data_ring *ring =
+	    rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
+	struct data_entry *entry = rt2x00_get_data_entry(ring);
+	struct sk_buff *skb;
+
+	skb = ieee80211_beacon_get(rt2x00dev->hw,
+				   rt2x00dev->interface.id,
+				   &entry->tx_status.control);
+	if (!skb)
+		return;
+
+	rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
+					  &entry->tx_status.control);
+
+	dev_kfree_skb(skb);
+}
+
+void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
+{
+	if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+		return;
+
+	queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->beacon_work);
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
+
+void rt2x00lib_txdone(struct data_entry *entry,
+		      const int status, const int retry)
+{
+	struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
+	struct ieee80211_tx_status *tx_status = &entry->tx_status;
+	struct ieee80211_low_level_stats *stats = &rt2x00dev->low_level_stats;
+	int success = !!(status == TX_SUCCESS || status == TX_SUCCESS_RETRY);
+	int fail = !!(status == TX_FAIL_RETRY || status == TX_FAIL_INVALID ||
+		      status == TX_FAIL_OTHER);
+
+	/*
+	 * Update TX statistics.
+	 */
+	tx_status->flags = 0;
+	tx_status->ack_signal = 0;
+	tx_status->excessive_retries = (status == TX_FAIL_RETRY);
+	tx_status->retry_count = retry;
+	rt2x00dev->link.tx_success += success;
+	rt2x00dev->link.tx_failed += retry + fail;
+
+	if (!(tx_status->control.flags & IEEE80211_TXCTL_NO_ACK)) {
+		if (success)
+			tx_status->flags |= IEEE80211_TX_STATUS_ACK;
+		else
+			stats->dot11ACKFailureCount++;
+	}
+
+	tx_status->queue_length = entry->ring->stats.limit;
+	tx_status->queue_number = tx_status->control.queue;
+
+	if (tx_status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) {
+		if (success)
+			stats->dot11RTSSuccessCount++;
+		else
+			stats->dot11RTSFailureCount++;
+	}
+
+	/*
+	 * Send the tx_status to mac80211,
+	 * that method also cleans up the skb structure.
+	 */
+	ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb, tx_status);
+	entry->skb = NULL;
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
+
+void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
+		      const int signal, const int rssi, const int ofdm)
+{
+	struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
+	struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
+	struct ieee80211_hw_mode *mode;
+	struct ieee80211_rate *rate;
+	unsigned int i;
+	int val = 0;
+
+	/*
+	 * Update RX statistics.
+	 */
+	mode = &rt2x00dev->hwmodes[rt2x00dev->curr_hwmode];
+	for (i = 0; i < mode->num_rates; i++) {
+		rate = &mode->rates[i];
+
+		/*
+		 * When frame was received with an OFDM bitrate,
+		 * the signal is the PLCP value. If it was received with
+		 * a CCK bitrate the signal is the rate in 0.5kbit/s.
+		 */
+		if (!ofdm)
+			val = DEVICE_GET_RATE_FIELD(rate->val, RATE);
+		else
+			val = DEVICE_GET_RATE_FIELD(rate->val, PLCP);
+
+		if (val == signal) {
+			val = rate->val;
+			break;
+		}
+	}
+
+	rt2x00_update_link_rssi(&rt2x00dev->link, rssi);
+	rt2x00dev->link.rx_success++;
+	rx_status->rate = val;
+	rx_status->signal = rt2x00lib_calculate_link_signal(rt2x00dev, rssi);
+	rx_status->ssi = rssi;
+
+	/*
+	 * Send frame to mac80211
+	 */
+	ieee80211_rx_irqsafe(rt2x00dev->hw, skb, rx_status);
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
+
+/*
+ * TX descriptor initializer
+ */
+void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
+			     struct data_desc *txd,
+			     struct ieee80211_hdr *ieee80211hdr,
+			     unsigned int length,
+			     struct ieee80211_tx_control *control)
+{
+	struct data_entry_desc desc;
+	struct data_ring *ring;
+	int tx_rate;
+	int bitrate;
+	int duration;
+	int residual;
+	u16 frame_control;
+	u16 seq_ctrl;
+
+	/*
+	 * Make sure the descriptor is properly cleared.
+	 */
+	memset(&desc, 0x00, sizeof(desc));
+
+	/*
+	 * Get ring pointer, if we fail to obtain the
+	 * correct ring, then use the first TX ring.
+	 */
+	ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
+	if (!ring)
+		ring = rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_DATA0);
+
+	desc.cw_min = ring->tx_params.cw_min;
+	desc.cw_max = ring->tx_params.cw_max;
+	desc.aifs = ring->tx_params.aifs;
+
+	/*
+	 * Identify queue
+	 */
+	if (control->queue < rt2x00dev->hw->queues)
+		desc.queue = control->queue;
+	else if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
+		 control->queue == IEEE80211_TX_QUEUE_AFTER_BEACON)
+		desc.queue = QUEUE_MGMT;
+	else
+		desc.queue = QUEUE_OTHER;
+
+	/*
+	 * Read required fields from ieee80211 header.
+	 */
+	frame_control = le16_to_cpu(ieee80211hdr->frame_control);
+	seq_ctrl = le16_to_cpu(ieee80211hdr->seq_ctrl);
+
+	tx_rate = control->tx_rate;
+
+	/*
+	 * Check if this is a RTS/CTS frame
+	 */
+	if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) {
+		__set_bit(ENTRY_TXD_BURST, &desc.flags);
+		if (is_rts_frame(frame_control))
+			__set_bit(ENTRY_TXD_RTS_FRAME, &desc.flags);
+		if (control->rts_cts_rate)
+			tx_rate = control->rts_cts_rate;
+	}
+
+	/*
+	 * Check for OFDM
+	 */
+	if (DEVICE_GET_RATE_FIELD(tx_rate, RATEMASK) & DEV_OFDM_RATEMASK)
+		__set_bit(ENTRY_TXD_OFDM_RATE, &desc.flags);
+
+	/*
+	 * Check if more fragments are pending
+	 */
+	if (ieee80211_get_morefrag(ieee80211hdr)) {
+		__set_bit(ENTRY_TXD_BURST, &desc.flags);
+		__set_bit(ENTRY_TXD_MORE_FRAG, &desc.flags);
+	}
+
+	/*
+	 * Beacons and probe responses require the tsf timestamp
+	 * to be inserted into the frame.
+	 */
+	if (control->queue == IEEE80211_TX_QUEUE_BEACON ||
+	    is_probe_resp(frame_control))
+		__set_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc.flags);
+
+	/*
+	 * Determine with what IFS priority this frame should be send.
+	 * Set ifs to IFS_SIFS when the this is not the first fragment,
+	 * or this fragment came after RTS/CTS.
+	 */
+	if ((seq_ctrl & IEEE80211_SCTL_FRAG) > 0 ||
+	    test_bit(ENTRY_TXD_RTS_FRAME, &desc.flags))
+		desc.ifs = IFS_SIFS;
+	else
+		desc.ifs = IFS_BACKOFF;
+
+	/*
+	 * PLCP setup
+	 * Length calculation depends on OFDM/CCK rate.
+	 */
+	desc.signal = DEVICE_GET_RATE_FIELD(tx_rate, PLCP);
+	desc.service = 0x04;
+
+	if (test_bit(ENTRY_TXD_OFDM_RATE, &desc.flags)) {
+		desc.length_high = ((length + FCS_LEN) >> 6) & 0x3f;
+		desc.length_low = ((length + FCS_LEN) & 0x3f);
+	} else {
+		bitrate = DEVICE_GET_RATE_FIELD(tx_rate, RATE);
+
+		/*
+		 * Convert length to microseconds.
+		 */
+		residual = get_duration_res(length + FCS_LEN, bitrate);
+		duration = get_duration(length + FCS_LEN, bitrate);
+
+		if (residual != 0) {
+			duration++;
+
+			/*
+			 * Check if we need to set the Length Extension
+			 */
+			if (bitrate == 110 && residual <= 3)
+				desc.service |= 0x80;
+		}
+
+		desc.length_high = (duration >> 8) & 0xff;
+		desc.length_low = duration & 0xff;
+
+		/*
+		 * When preamble is enabled we should set the
+		 * preamble bit for the signal.
+		 */
+		if (DEVICE_GET_RATE_FIELD(tx_rate, PREAMBLE))
+			desc.signal |= 0x08;
+	}
+
+	rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, txd, &desc,
+					   ieee80211hdr, length, control);
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
+
+/*
+ * Driver initialization handlers.
+ */
+static void rt2x00lib_channel(struct ieee80211_channel *entry,
+			      const int channel, const int tx_power,
+			      const int value)
+{
+	entry->chan = channel;
+	if (channel <= 14)
+		entry->freq = 2407 + (5 * channel);
+	else
+		entry->freq = 5000 + (5 * channel);
+	entry->val = value;
+	entry->flag =
+	    IEEE80211_CHAN_W_IBSS |
+	    IEEE80211_CHAN_W_ACTIVE_SCAN |
+	    IEEE80211_CHAN_W_SCAN;
+	entry->power_level = tx_power;
+	entry->antenna_max = 0xff;
+}
+
+static void rt2x00lib_rate(struct ieee80211_rate *entry,
+			   const int rate, const int mask,
+			   const int plcp, const int flags)
+{
+	entry->rate = rate;
+	entry->val =
+	    DEVICE_SET_RATE_FIELD(rate, RATE) |
+	    DEVICE_SET_RATE_FIELD(mask, RATEMASK) |
+	    DEVICE_SET_RATE_FIELD(plcp, PLCP);
+	entry->flags = flags;
+	entry->val2 = entry->val;
+	if (entry->flags & IEEE80211_RATE_PREAMBLE2)
+		entry->val2 |= DEVICE_SET_RATE_FIELD(1, PREAMBLE);
+	entry->min_rssi_ack = 0;
+	entry->min_rssi_ack_delta = 0;
+}
+
+static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
+				    struct hw_mode_spec *spec)
+{
+	struct ieee80211_hw *hw = rt2x00dev->hw;
+	struct ieee80211_hw_mode *hwmodes;
+	struct ieee80211_channel *channels;
+	struct ieee80211_rate *rates;
+	unsigned int i;
+	unsigned char tx_power;
+
+	hwmodes = kzalloc(sizeof(*hwmodes) * spec->num_modes, GFP_KERNEL);
+	if (!hwmodes)
+		goto exit;
+
+	channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
+	if (!channels)
+		goto exit_free_modes;
+
+	rates = kzalloc(sizeof(*rates) * spec->num_rates, GFP_KERNEL);
+	if (!rates)
+		goto exit_free_channels;
+
+	/*
+	 * Initialize Rate list.
+	 */
+	rt2x00lib_rate(&rates[0], 10, DEV_RATEMASK_1MB,
+		       0x00, IEEE80211_RATE_CCK);
+	rt2x00lib_rate(&rates[1], 20, DEV_RATEMASK_2MB,
+		       0x01, IEEE80211_RATE_CCK_2);
+	rt2x00lib_rate(&rates[2], 55, DEV_RATEMASK_5_5MB,
+		       0x02, IEEE80211_RATE_CCK_2);
+	rt2x00lib_rate(&rates[3], 110, DEV_RATEMASK_11MB,
+		       0x03, IEEE80211_RATE_CCK_2);
+
+	if (spec->num_rates > 4) {
+		rt2x00lib_rate(&rates[4], 60, DEV_RATEMASK_6MB,
+			       0x0b, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[5], 90, DEV_RATEMASK_9MB,
+			       0x0f, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[6], 120, DEV_RATEMASK_12MB,
+			       0x0a, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[7], 180, DEV_RATEMASK_18MB,
+			       0x0e, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[8], 240, DEV_RATEMASK_24MB,
+			       0x09, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[9], 360, DEV_RATEMASK_36MB,
+			       0x0d, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[10], 480, DEV_RATEMASK_48MB,
+			       0x08, IEEE80211_RATE_OFDM);
+		rt2x00lib_rate(&rates[11], 540, DEV_RATEMASK_54MB,
+			       0x0c, IEEE80211_RATE_OFDM);
+	}
+
+	/*
+	 * Initialize Channel list.
+	 */
+	for (i = 0; i < spec->num_channels; i++) {
+		if (spec->channels[i].channel <= 14)
+			tx_power = spec->tx_power_bg[i];
+		else if (spec->tx_power_a)
+			tx_power = spec->tx_power_a[i];
+		else
+			tx_power = spec->tx_power_default;
+
+		rt2x00lib_channel(&channels[i],
+				  spec->channels[i].channel, tx_power, i);
+	}
+
+	/*
+	 * Intitialize 802.11b
+	 * Rates: CCK.
+	 * Channels: OFDM.
+	 */
+	if (spec->num_modes > HWMODE_B) {
+		hwmodes[HWMODE_B].mode = MODE_IEEE80211B;
+		hwmodes[HWMODE_B].num_channels = 14;
+		hwmodes[HWMODE_B].num_rates = 4;
+		hwmodes[HWMODE_B].channels = channels;
+		hwmodes[HWMODE_B].rates = rates;
+	}
+
+	/*
+	 * Intitialize 802.11g
+	 * Rates: CCK, OFDM.
+	 * Channels: OFDM.
+	 */
+	if (spec->num_modes > HWMODE_G) {
+		hwmodes[HWMODE_G].mode = MODE_IEEE80211G;
+		hwmodes[HWMODE_G].num_channels = 14;
+		hwmodes[HWMODE_G].num_rates = spec->num_rates;
+		hwmodes[HWMODE_G].channels = channels;
+		hwmodes[HWMODE_G].rates = rates;
+	}
+
+	/*
+	 * Intitialize 802.11a
+	 * Rates: OFDM.
+	 * Channels: OFDM, UNII, HiperLAN2.
+	 */
+	if (spec->num_modes > HWMODE_A) {
+		hwmodes[HWMODE_A].mode = MODE_IEEE80211A;
+		hwmodes[HWMODE_A].num_channels = spec->num_channels - 14;
+		hwmodes[HWMODE_A].num_rates = spec->num_rates - 4;
+		hwmodes[HWMODE_A].channels = &channels[14];
+		hwmodes[HWMODE_A].rates = &rates[4];
+	}
+
+	if (spec->num_modes > HWMODE_G &&
+	    ieee80211_register_hwmode(hw, &hwmodes[HWMODE_G]))
+		goto exit_free_rates;
+
+	if (spec->num_modes > HWMODE_B &&
+	    ieee80211_register_hwmode(hw, &hwmodes[HWMODE_B]))
+		goto exit_free_rates;
+
+	if (spec->num_modes > HWMODE_A &&
+	    ieee80211_register_hwmode(hw, &hwmodes[HWMODE_A]))
+		goto exit_free_rates;
+
+	rt2x00dev->hwmodes = hwmodes;
+
+	return 0;
+
+exit_free_rates:
+	kfree(rates);
+
+exit_free_channels:
+	kfree(channels);
+
+exit_free_modes:
+	kfree(hwmodes);
+
+exit:
+	ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
+	return -ENOMEM;
+}
+
+static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
+{
+	if (test_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags))
+		ieee80211_unregister_hw(rt2x00dev->hw);
+
+	if (likely(rt2x00dev->hwmodes)) {
+		kfree(rt2x00dev->hwmodes->channels);
+		kfree(rt2x00dev->hwmodes->rates);
+		kfree(rt2x00dev->hwmodes);
+		rt2x00dev->hwmodes = NULL;
+	}
+}
+
+static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
+{
+	struct hw_mode_spec *spec = &rt2x00dev->spec;
+	int status;
+
+	/*
+	 * Initialize HW modes.
+	 */
+	status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
+	if (status)
+		return status;
+
+	/*
+	 * Register HW.
+	 */
+	status = ieee80211_register_hw(rt2x00dev->hw);
+	if (status) {
+		rt2x00lib_remove_hw(rt2x00dev);
+		return status;
+	}
+
+	__set_bit(DEVICE_INITIALIZED_HW, &rt2x00dev->flags);
+
+	return 0;
+}
+
+/*
+ * Initialization/uninitialization handlers.
+ */
+static int rt2x00lib_alloc_entries(struct data_ring *ring,
+				   const u16 max_entries, const u16 data_size,
+				   const u16 desc_size)
+{
+	struct data_entry *entry;
+	unsigned int i;
+
+	ring->stats.limit = max_entries;
+	ring->data_size = data_size;
+	ring->desc_size = desc_size;
+
+	/*
+	 * Allocate all ring entries.
+	 */
+	entry = kzalloc(ring->stats.limit * sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	for (i = 0; i < ring->stats.limit; i++) {
+		entry[i].flags = 0;
+		entry[i].ring = ring;
+		entry[i].skb = NULL;
+	}
+
+	ring->entry = entry;
+
+	return 0;
+}
+
+static int rt2x00lib_alloc_ring_entries(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_ring *ring;
+
+	/*
+	 * Allocate the RX ring.
+	 */
+	if (rt2x00lib_alloc_entries(rt2x00dev->rx, RX_ENTRIES, DATA_FRAME_SIZE,
+				    rt2x00dev->ops->rxd_size))
+		return -ENOMEM;
+
+	/*
+	 * First allocate the TX rings.
+	 */
+	txring_for_each(rt2x00dev, ring) {
+		if (rt2x00lib_alloc_entries(ring, TX_ENTRIES, DATA_FRAME_SIZE,
+					    rt2x00dev->ops->txd_size))
+			return -ENOMEM;
+	}
+
+	if (!test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags))
+		return 0;
+
+	/*
+	 * Allocate the BEACON ring.
+	 */
+	if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[0], BEACON_ENTRIES,
+				    MGMT_FRAME_SIZE, rt2x00dev->ops->txd_size))
+		return -ENOMEM;
+
+	/*
+	 * Allocate the Atim ring.
+	 */
+	if (rt2x00lib_alloc_entries(&rt2x00dev->bcn[1], ATIM_ENTRIES,
+				    DATA_FRAME_SIZE, rt2x00dev->ops->txd_size))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void rt2x00lib_free_ring_entries(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_ring *ring;
+
+	ring_for_each(rt2x00dev, ring) {
+		kfree(ring->entry);
+		ring->entry = NULL;
+	}
+}
+
+void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
+{
+	if (!__test_and_clear_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
+		return;
+
+	/*
+	 * Unregister rfkill.
+	 */
+	rt2x00rfkill_unregister(rt2x00dev);
+
+	/*
+	 * Allow the HW to uninitialize.
+	 */
+	rt2x00dev->ops->lib->uninitialize(rt2x00dev);
+
+	/*
+	 * Free allocated ring entries.
+	 */
+	rt2x00lib_free_ring_entries(rt2x00dev);
+}
+
+int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
+{
+	int status;
+
+	if (test_bit(DEVICE_INITIALIZED, &rt2x00dev->flags))
+		return 0;
+
+	/*
+	 * Allocate all ring entries.
+	 */
+	status = rt2x00lib_alloc_ring_entries(rt2x00dev);
+	if (status) {
+		ERROR(rt2x00dev, "Ring entries allocation failed.\n");
+		return status;
+	}
+
+	/*
+	 * Initialize the device.
+	 */
+	status = rt2x00dev->ops->lib->initialize(rt2x00dev);
+	if (status)
+		goto exit;
+
+	__set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
+
+	/*
+	 * Register the rfkill handler.
+	 */
+	status = rt2x00rfkill_register(rt2x00dev);
+	if (status)
+		goto exit_unitialize;
+
+	return 0;
+
+exit_unitialize:
+	rt2x00lib_uninitialize(rt2x00dev);
+
+exit:
+	rt2x00lib_free_ring_entries(rt2x00dev);
+
+	return status;
+}
+
+/*
+ * driver allocation handlers.
+ */
+static int rt2x00lib_alloc_rings(struct rt2x00_dev *rt2x00dev)
+{
+	struct data_ring *ring;
+
+	/*
+	 * We need the following rings:
+	 * RX: 1
+	 * TX: hw->queues
+	 * Beacon: 1 (if required)
+	 * Atim: 1 (if required)
+	 */
+	rt2x00dev->data_rings = 1 + rt2x00dev->hw->queues +
+	    (2 * test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags));
+
+	ring = kzalloc(rt2x00dev->data_rings * sizeof(*ring), GFP_KERNEL);
+	if (!ring) {
+		ERROR(rt2x00dev, "Ring allocation failed.\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * Initialize pointers
+	 */
+	rt2x00dev->rx = ring;
+	rt2x00dev->tx = &rt2x00dev->rx[1];
+	if (test_bit(REQUIRE_BEACON_RING, &rt2x00dev->flags))
+		rt2x00dev->bcn = &rt2x00dev->tx[rt2x00dev->hw->queues];
+
+	/*
+	 * Initialize ring parameters.
+	 * cw_min: 2^5 = 32.
+	 * cw_max: 2^10 = 1024.
+	 */
+	ring_for_each(rt2x00dev, ring) {
+		ring->rt2x00dev = rt2x00dev;
+		ring->tx_params.aifs = 2;
+		ring->tx_params.cw_min = 5;
+		ring->tx_params.cw_max = 10;
+	}
+
+	return 0;
+}
+
+static void rt2x00lib_free_rings(struct rt2x00_dev *rt2x00dev)
+{
+	kfree(rt2x00dev->rx);
+	rt2x00dev->rx = NULL;
+	rt2x00dev->tx = NULL;
+	rt2x00dev->bcn = NULL;
+}
+
+int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
+{
+	int retval = -ENOMEM;
+
+	/*
+	 * Let the driver probe the device to detect the capabilities.
+	 */
+	retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
+	if (retval) {
+		ERROR(rt2x00dev, "Failed to allocate device.\n");
+		goto exit;
+	}
+
+	/*
+	 * Initialize configuration work.
+	 */
+	INIT_WORK(&rt2x00dev->beacon_work, rt2x00lib_beacondone_scheduled);
+	INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
+
+	/*
+	 * Reset current working type.
+	 */
+	rt2x00dev->interface.type = INVALID_INTERFACE;
+
+	/*
+	 * Allocate ring array.
+	 */
+	retval = rt2x00lib_alloc_rings(rt2x00dev);
+	if (retval)
+		goto exit;
+
+	/*
+	 * Initialize ieee80211 structure.
+	 */
+	retval = rt2x00lib_probe_hw(rt2x00dev);
+	if (retval) {
+		ERROR(rt2x00dev, "Failed to initialize hw.\n");
+		goto exit;
+	}
+
+	/*
+	 * Allocatie rfkill.
+	 */
+	retval = rt2x00rfkill_allocate(rt2x00dev);
+	if (retval)
+		goto exit;
+
+	/*
+	 * Open the debugfs entry.
+	 */
+	rt2x00debug_register(rt2x00dev);
+
+	return 0;
+
+exit:
+	rt2x00lib_remove_dev(rt2x00dev);
+
+	return retval;
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
+
+void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
+{
+	/*
+	 * Disable radio.
+	 */
+	rt2x00lib_disable_radio(rt2x00dev);
+
+	/*
+	 * Uninitialize device.
+	 */
+	rt2x00lib_uninitialize(rt2x00dev);
+
+	/*
+	 * Close debugfs entry.
+	 */
+	rt2x00debug_deregister(rt2x00dev);
+
+	/*
+	 * Free rfkill
+	 */
+	rt2x00rfkill_free(rt2x00dev);
+
+	/*
+	 * Free ieee80211_hw memory.
+	 */
+	rt2x00lib_remove_hw(rt2x00dev);
+
+	/*
+	 * Free firmware image.
+	 */
+	rt2x00lib_free_firmware(rt2x00dev);
+
+	/*
+	 * Free ring structures.
+	 */
+	rt2x00lib_free_rings(rt2x00dev);
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
+
+/*
+ * Device state handlers
+ */
+#ifdef CONFIG_PM
+int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
+{
+	int retval;
+
+	NOTICE(rt2x00dev, "Going to sleep.\n");
+
+	/*
+	 * Disable radio and unitialize all items
+	 * that must be recreated on resume.
+	 */
+	rt2x00lib_disable_radio(rt2x00dev);
+	rt2x00lib_uninitialize(rt2x00dev);
+	rt2x00debug_deregister(rt2x00dev);
+
+	/*
+	 * Set device mode to sleep for power management.
+	 */
+	retval = rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP);
+	if (retval)
+		return retval;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
+
+int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
+{
+	struct interface *intf = &rt2x00dev->interface;
+	int retval;
+
+	NOTICE(rt2x00dev, "Waking up.\n");
+	__set_bit(INTERFACE_RESUME, &rt2x00dev->flags);
+
+	/*
+	 * Open the debugfs entry.
+	 */
+	rt2x00debug_register(rt2x00dev);
+
+	/*
+	 * Reinitialize device and all active interfaces.
+	 */
+	retval = rt2x00mac_start(rt2x00dev->hw);
+	if (retval)
+		goto exit;
+
+	/*
+	 * Reconfigure device.
+	 */
+	retval = rt2x00mac_config(rt2x00dev->hw, &rt2x00dev->hw->conf);
+	if (retval)
+		goto exit;
+
+	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
+	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
+	rt2x00lib_config_type(rt2x00dev, intf->type);
+	rt2x00lib_config_packet_filter(rt2x00dev, intf->filter);
+
+	/*
+	 * When in Master or Ad-hoc mode,
+	 * restart Beacon transmitting by faking a beacondone event.
+	 */
+	if (intf->type == IEEE80211_IF_TYPE_AP ||
+	    intf->type == IEEE80211_IF_TYPE_IBSS)
+		rt2x00lib_beacondone(rt2x00dev);
+
+	__clear_bit(INTERFACE_RESUME, &rt2x00dev->flags);
+
+	return 0;
+
+exit:
+	rt2x00lib_disable_radio(rt2x00dev);
+	rt2x00lib_uninitialize(rt2x00dev);
+	rt2x00debug_deregister(rt2x00dev);
+
+	__clear_bit(INTERFACE_RESUME, &rt2x00dev->flags);
+
+	return retval;
+}
+EXPORT_SYMBOL_GPL(rt2x00lib_resume);
+#endif /* CONFIG_PM */
+
+/*
+ * rt2x00lib module information.
+ */
+MODULE_AUTHOR(DRV_PROJECT);
+MODULE_VERSION(DRV_VERSION);
+MODULE_DESCRIPTION("rt2x00 library");
+MODULE_LICENSE("GPL");