[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");