/*
        Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
        <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, see <http://www.gnu.org/licenses/>.
 */

/*
        Module: rt73usb
        Abstract: rt73usb device specific routines.
        Supported chipsets: rt2571W & rt2671.
 */

#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include "rt2x00.h"
#include "rt2x00usb.h"
#include "rt73usb.h"

/*
 * Allow hardware encryption to be disabled.
 */
static bool modparam_nohwcrypt;
module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt2x00usb_register_read and rt2x00usb_register_write.
 * BBP and RF register require indirect register access,
 * and use the CSR registers BBPCSR and RFCSR to achieve this.
 * These indirect registers work with busy bits,
 * and we will try maximal REGISTER_BUSY_COUNT times to access
 * the register while taking a REGISTER_BUSY_DELAY us delay
 * between each attampt. When the busy bit is still set at that time,
 * the access attempt is considered to have failed,
 * and we will print an error.
 * The _lock versions must be used if you already hold the csr_mutex
 */
#define WAIT_FOR_BBP(__dev, __reg) \
        rt2x00usb_regbusy_read((__dev), PHY_CSR3, PHY_CSR3_BUSY, (__reg))
#define WAIT_FOR_RF(__dev, __reg) \
        rt2x00usb_regbusy_read((__dev), PHY_CSR4, PHY_CSR4_BUSY, (__reg))

static void rt73usb_bbp_write(struct rt2x00_dev *rt2x00dev,
                              const unsigned int word, const u8 value)
{
        u32 reg;

        mutex_lock(&rt2x00dev->csr_mutex);

        /*
         * Wait until the BBP becomes available, afterwards we
         * can safely write the new data into the register.
         */
        if (WAIT_FOR_BBP(rt2x00dev, &reg)) {
                reg = 0;
                rt2x00_set_field32(&reg, PHY_CSR3_VALUE, value);
                rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
                rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
                rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 0);

                rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);
        }

        mutex_unlock(&rt2x00dev->csr_mutex);
}

static void rt73usb_bbp_read(struct rt2x00_dev *rt2x00dev,
                             const unsigned int word, u8 *value)
{
        u32 reg;

        mutex_lock(&rt2x00dev->csr_mutex);

        /*
         * Wait until the BBP becomes available, afterwards we
         * can safely write the read request into the register.
         * After the data has been written, we wait until hardware
         * returns the correct value, if at any time the register
         * doesn't become available in time, reg will be 0xffffffff
         * which means we return 0xff to the caller.
         */
        if (WAIT_FOR_BBP(rt2x00dev, &reg)) {
                reg = 0;
                rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
                rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
                rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 1);

                rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);

                WAIT_FOR_BBP(rt2x00dev, &reg);
        }

        *value = rt2x00_get_field32(reg, PHY_CSR3_VALUE);

        mutex_unlock(&rt2x00dev->csr_mutex);
}

static void rt73usb_rf_write(struct rt2x00_dev *rt2x00dev,
                             const unsigned int word, const u32 value)
{
        u32 reg;

        mutex_lock(&rt2x00dev->csr_mutex);

        /*
         * Wait until the RF becomes available, afterwards we
         * can safely write the new data into the register.
         */
        if (WAIT_FOR_RF(rt2x00dev, &reg)) {
                reg = 0;
                rt2x00_set_field32(&reg, PHY_CSR4_VALUE, value);
                /*
                 * RF5225 and RF2527 contain 21 bits per RF register value,
                 * all others contain 20 bits.
                 */
                rt2x00_set_field32(&reg, PHY_CSR4_NUMBER_OF_BITS,
                                   20 + (rt2x00_rf(rt2x00dev, RF5225) ||
                                         rt2x00_rf(rt2x00dev, RF2527)));
                rt2x00_set_field32(&reg, PHY_CSR4_IF_SELECT, 0);
                rt2x00_set_field32(&reg, PHY_CSR4_BUSY, 1);

                rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR4, reg);
                rt2x00_rf_write(rt2x00dev, word, value);
        }

        mutex_unlock(&rt2x00dev->csr_mutex);
}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
static const struct rt2x00debug rt73usb_rt2x00debug = {
        .owner  = THIS_MODULE,
        .csr    = {
                .read           = rt2x00usb_register_read,
                .write          = rt2x00usb_register_write,
                .flags          = RT2X00DEBUGFS_OFFSET,
                .word_base      = CSR_REG_BASE,
                .word_size      = sizeof(u32),
                .word_count     = CSR_REG_SIZE / sizeof(u32),
        },
        .eeprom = {
                .read           = rt2x00_eeprom_read,
                .write          = rt2x00_eeprom_write,
                .word_base      = EEPROM_BASE,
                .word_size      = sizeof(u16),
                .word_count     = EEPROM_SIZE / sizeof(u16),
        },
        .bbp    = {
                .read           = rt73usb_bbp_read,
                .write          = rt73usb_bbp_write,
                .word_base      = BBP_BASE,
                .word_size      = sizeof(u8),
                .word_count     = BBP_SIZE / sizeof(u8),
        },
        .rf     = {
                .read           = rt2x00_rf_read,
                .write          = rt73usb_rf_write,
                .word_base      = RF_BASE,
                .word_size      = sizeof(u32),
                .word_count     = RF_SIZE / sizeof(u32),
        },
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

static int rt73usb_rfkill_poll(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        rt2x00usb_register_read(rt2x00dev, MAC_CSR13, &reg);
        return rt2x00_get_field32(reg, MAC_CSR13_VAL7);
}

#ifdef CONFIG_RT2X00_LIB_LEDS
static void rt73usb_brightness_set(struct led_classdev *led_cdev,
                                   enum led_brightness brightness)
{
        struct rt2x00_led *led =
           container_of(led_cdev, struct rt2x00_led, led_dev);
        unsigned int enabled = brightness != LED_OFF;
        unsigned int a_mode =
            (enabled && led->rt2x00dev->curr_band == IEEE80211_BAND_5GHZ);
        unsigned int bg_mode =
            (enabled && led->rt2x00dev->curr_band == IEEE80211_BAND_2GHZ);

        if (led->type == LED_TYPE_RADIO) {
                rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
                                   MCU_LEDCS_RADIO_STATUS, enabled);

                rt2x00usb_vendor_request_sw(led->rt2x00dev, USB_LED_CONTROL,
                                            0, led->rt2x00dev->led_mcu_reg,
                                            REGISTER_TIMEOUT);
        } else if (led->type == LED_TYPE_ASSOC) {
                rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
                                   MCU_LEDCS_LINK_BG_STATUS, bg_mode);
                rt2x00_set_field16(&led->rt2x00dev->led_mcu_reg,
                                   MCU_LEDCS_LINK_A_STATUS, a_mode);

                rt2x00usb_vendor_request_sw(led->rt2x00dev, USB_LED_CONTROL,
                                            0, led->rt2x00dev->led_mcu_reg,
                                            REGISTER_TIMEOUT);
        } else if (led->type == LED_TYPE_QUALITY) {
                /*
                 * The brightness is divided into 6 levels (0 - 5),
                 * this means we need to convert the brightness
                 * argument into the matching level within that range.
                 */
                rt2x00usb_vendor_request_sw(led->rt2x00dev, USB_LED_CONTROL,
                                            brightness / (LED_FULL / 6),
                                            led->rt2x00dev->led_mcu_reg,
                                            REGISTER_TIMEOUT);
        }
}

static int rt73usb_blink_set(struct led_classdev *led_cdev,
                             unsigned long *delay_on,
                             unsigned long *delay_off)
{
        struct rt2x00_led *led =
            container_of(led_cdev, struct rt2x00_led, led_dev);
        u32 reg;

        rt2x00usb_register_read(led->rt2x00dev, MAC_CSR14, &reg);
        rt2x00_set_field32(&reg, MAC_CSR14_ON_PERIOD, *delay_on);
        rt2x00_set_field32(&reg, MAC_CSR14_OFF_PERIOD, *delay_off);
        rt2x00usb_register_write(led->rt2x00dev, MAC_CSR14, reg);

        return 0;
}

static void rt73usb_init_led(struct rt2x00_dev *rt2x00dev,
                             struct rt2x00_led *led,
                             enum led_type type)
{
        led->rt2x00dev = rt2x00dev;
        led->type = type;
        led->led_dev.brightness_set = rt73usb_brightness_set;
        led->led_dev.blink_set = rt73usb_blink_set;
        led->flags = LED_INITIALIZED;
}
#endif /* CONFIG_RT2X00_LIB_LEDS */

/*
 * Configuration handlers.
 */
static int rt73usb_config_shared_key(struct rt2x00_dev *rt2x00dev,
                                     struct rt2x00lib_crypto *crypto,
                                     struct ieee80211_key_conf *key)
{
        struct hw_key_entry key_entry;
        struct rt2x00_field32 field;
        u32 mask;
        u32 reg;

        if (crypto->cmd == SET_KEY) {
                /*
                 * rt2x00lib can't determine the correct free
                 * key_idx for shared keys. We have 1 register
                 * with key valid bits. The goal is simple, read
                 * the register, if that is full we have no slots
                 * left.
                 * Note that each BSS is allowed to have up to 4
                 * shared keys, so put a mask over the allowed
                 * entries.
                 */
                mask = (0xf << crypto->bssidx);

                rt2x00usb_register_read(rt2x00dev, SEC_CSR0, &reg);
                reg &= mask;

                if (reg && reg == mask)
                        return -ENOSPC;

                key->hw_key_idx += reg ? ffz(reg) : 0;

                /*
                 * Upload key to hardware
                 */
                memcpy(key_entry.key, crypto->key,
                       sizeof(key_entry.key));
                memcpy(key_entry.tx_mic, crypto->tx_mic,
                       sizeof(key_entry.tx_mic));
                memcpy(key_entry.rx_mic, crypto->rx_mic,
                       sizeof(key_entry.rx_mic));

                reg = SHARED_KEY_ENTRY(key->hw_key_idx);
                rt2x00usb_register_multiwrite(rt2x00dev, reg,
                                              &key_entry, sizeof(key_entry));

                /*
                 * The cipher types are stored over 2 registers.
                 * bssidx 0 and 1 keys are stored in SEC_CSR1 and
                 * bssidx 1 and 2 keys are stored in SEC_CSR5.
                 * Using the correct defines correctly will cause overhead,
                 * so just calculate the correct offset.
                 */
                if (key->hw_key_idx < 8) {
                        field.bit_offset = (3 * key->hw_key_idx);
                        field.bit_mask = 0x7 << field.bit_offset;

                        rt2x00usb_register_read(rt2x00dev, SEC_CSR1, &reg);
                        rt2x00_set_field32(&reg, field, crypto->cipher);
                        rt2x00usb_register_write(rt2x00dev, SEC_CSR1, reg);
                } else {
                        field.bit_offset = (3 * (key->hw_key_idx - 8));
                        field.bit_mask = 0x7 << field.bit_offset;

                        rt2x00usb_register_read(rt2x00dev, SEC_CSR5, &reg);
                        rt2x00_set_field32(&reg, field, crypto->cipher);
                        rt2x00usb_register_write(rt2x00dev, SEC_CSR5, reg);
                }

                /*
                 * The driver does not support the IV/EIV generation
                 * in hardware. However it doesn't support the IV/EIV
                 * inside the ieee80211 frame either, but requires it
                 * to be provided separately for the descriptor.
                 * rt2x00lib will cut the IV/EIV data out of all frames
                 * given to us by mac80211, but we must tell mac80211
                 * to generate the IV/EIV data.
                 */
                key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
        }

        /*
         * SEC_CSR0 contains only single-bit fields to indicate
         * a particular key is valid. Because using the FIELD32()
         * defines directly will cause a lot of overhead we use
         * a calculation to determine the correct bit directly.
         */
        mask = 1 << key->hw_key_idx;

        rt2x00usb_register_read(rt2x00dev, SEC_CSR0, &reg);
        if (crypto->cmd == SET_KEY)
                reg |= mask;
        else if (crypto->cmd == DISABLE_KEY)
                reg &= ~mask;
        rt2x00usb_register_write(rt2x00dev, SEC_CSR0, reg);

        return 0;
}

static int rt73usb_config_pairwise_key(struct rt2x00_dev *rt2x00dev,
                                       struct rt2x00lib_crypto *crypto,
                                       struct ieee80211_key_conf *key)
{
        struct hw_pairwise_ta_entry addr_entry;
        struct hw_key_entry key_entry;
        u32 mask;
        u32 reg;

        if (crypto->cmd == SET_KEY) {
                /*
                 * rt2x00lib can't determine the correct free
                 * key_idx for pairwise keys. We have 2 registers
                 * with key valid bits. The goal is simple, read
                 * the first register, if that is full move to
                 * the next register.
                 * When both registers are full, we drop the key,
                 * otherwise we use the first invalid entry.
                 */
                rt2x00usb_register_read(rt2x00dev, SEC_CSR2, &reg);
                if (reg && reg == ~0) {
                        key->hw_key_idx = 32;
                        rt2x00usb_register_read(rt2x00dev, SEC_CSR3, &reg);
                        if (reg && reg == ~0)
                                return -ENOSPC;
                }

                key->hw_key_idx += reg ? ffz(reg) : 0;

                /*
                 * Upload key to hardware
                 */
                memcpy(key_entry.key, crypto->key,
                       sizeof(key_entry.key));
                memcpy(key_entry.tx_mic, crypto->tx_mic,
                       sizeof(key_entry.tx_mic));
                memcpy(key_entry.rx_mic, crypto->rx_mic,
                       sizeof(key_entry.rx_mic));

                reg = PAIRWISE_KEY_ENTRY(key->hw_key_idx);
                rt2x00usb_register_multiwrite(rt2x00dev, reg,
                                              &key_entry, sizeof(key_entry));

                /*
                 * Send the address and cipher type to the hardware register.
                 */
                memset(&addr_entry, 0, sizeof(addr_entry));
                memcpy(&addr_entry, crypto->address, ETH_ALEN);
                addr_entry.cipher = crypto->cipher;

                reg = PAIRWISE_TA_ENTRY(key->hw_key_idx);
                rt2x00usb_register_multiwrite(rt2x00dev, reg,
                                            &addr_entry, sizeof(addr_entry));

                /*
                 * Enable pairwise lookup table for given BSS idx,
                 * without this received frames will not be decrypted
                 * by the hardware.
                 */
                rt2x00usb_register_read(rt2x00dev, SEC_CSR4, &reg);
                reg |= (1 << crypto->bssidx);
                rt2x00usb_register_write(rt2x00dev, SEC_CSR4, reg);

                /*
                 * The driver does not support the IV/EIV generation
                 * in hardware. However it doesn't support the IV/EIV
                 * inside the ieee80211 frame either, but requires it
                 * to be provided separately for the descriptor.
                 * rt2x00lib will cut the IV/EIV data out of all frames
                 * given to us by mac80211, but we must tell mac80211
                 * to generate the IV/EIV data.
                 */
                key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
        }

        /*
         * SEC_CSR2 and SEC_CSR3 contain only single-bit fields to indicate
         * a particular key is valid. Because using the FIELD32()
         * defines directly will cause a lot of overhead we use
         * a calculation to determine the correct bit directly.
         */
        if (key->hw_key_idx < 32) {
                mask = 1 << key->hw_key_idx;

                rt2x00usb_register_read(rt2x00dev, SEC_CSR2, &reg);
                if (crypto->cmd == SET_KEY)
                        reg |= mask;
                else if (crypto->cmd == DISABLE_KEY)
                        reg &= ~mask;
                rt2x00usb_register_write(rt2x00dev, SEC_CSR2, reg);
        } else {
                mask = 1 << (key->hw_key_idx - 32);

                rt2x00usb_register_read(rt2x00dev, SEC_CSR3, &reg);
                if (crypto->cmd == SET_KEY)
                        reg |= mask;
                else if (crypto->cmd == DISABLE_KEY)
                        reg &= ~mask;
                rt2x00usb_register_write(rt2x00dev, SEC_CSR3, reg);
        }

        return 0;
}

static void rt73usb_config_filter(struct rt2x00_dev *rt2x00dev,
                                  const unsigned int filter_flags)
{
        u32 reg;

        /*
         * Start configuration steps.
         * Note that the version error will always be dropped
         * and broadcast frames will always be accepted since
         * there is no filter for it at this time.
         */
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_CRC,
                           !(filter_flags & FIF_FCSFAIL));
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_PHYSICAL,
                           !(filter_flags & FIF_PLCPFAIL));
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_CONTROL,
                           !(filter_flags & (FIF_CONTROL | FIF_PSPOLL)));
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_NOT_TO_ME, 1);
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_TO_DS,
                           !rt2x00dev->intf_ap_count);
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_VERSION_ERROR, 1);
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_MULTICAST,
                           !(filter_flags & FIF_ALLMULTI));
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_BROADCAST, 0);
        rt2x00_set_field32(&reg, TXRX_CSR0_DROP_ACK_CTS,
                           !(filter_flags & FIF_CONTROL));
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);
}

static void rt73usb_config_intf(struct rt2x00_dev *rt2x00dev,
                                struct rt2x00_intf *intf,
                                struct rt2x00intf_conf *conf,
                                const unsigned int flags)
{
        u32 reg;

        if (flags & CONFIG_UPDATE_TYPE) {
                /*
                 * Enable synchronisation.
                 */
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, conf->sync);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
        }

        if (flags & CONFIG_UPDATE_MAC) {
                reg = le32_to_cpu(conf->mac[1]);
                rt2x00_set_field32(&reg, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
                conf->mac[1] = cpu_to_le32(reg);

                rt2x00usb_register_multiwrite(rt2x00dev, MAC_CSR2,
                                            conf->mac, sizeof(conf->mac));
        }

        if (flags & CONFIG_UPDATE_BSSID) {
                reg = le32_to_cpu(conf->bssid[1]);
                rt2x00_set_field32(&reg, MAC_CSR5_BSS_ID_MASK, 3);
                conf->bssid[1] = cpu_to_le32(reg);

                rt2x00usb_register_multiwrite(rt2x00dev, MAC_CSR4,
                                            conf->bssid, sizeof(conf->bssid));
        }
}

static void rt73usb_config_erp(struct rt2x00_dev *rt2x00dev,
                               struct rt2x00lib_erp *erp,
                               u32 changed)
{
        u32 reg;

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, 0x32);
        rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);

        if (changed & BSS_CHANGED_ERP_PREAMBLE) {
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_ENABLE, 1);
                rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_PREAMBLE,
                                   !!erp->short_preamble);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR4, reg);
        }

        if (changed & BSS_CHANGED_BASIC_RATES)
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR5,
                                         erp->basic_rates);

        if (changed & BSS_CHANGED_BEACON_INT) {
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_INTERVAL,
                                   erp->beacon_int * 16);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
        }

        if (changed & BSS_CHANGED_ERP_SLOT) {
                rt2x00usb_register_read(rt2x00dev, MAC_CSR9, &reg);
                rt2x00_set_field32(&reg, MAC_CSR9_SLOT_TIME, erp->slot_time);
                rt2x00usb_register_write(rt2x00dev, MAC_CSR9, reg);

                rt2x00usb_register_read(rt2x00dev, MAC_CSR8, &reg);
                rt2x00_set_field32(&reg, MAC_CSR8_SIFS, erp->sifs);
                rt2x00_set_field32(&reg, MAC_CSR8_SIFS_AFTER_RX_OFDM, 3);
                rt2x00_set_field32(&reg, MAC_CSR8_EIFS, erp->eifs);
                rt2x00usb_register_write(rt2x00dev, MAC_CSR8, reg);
        }
}

static void rt73usb_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
                                      struct antenna_setup *ant)
{
        u8 r3;
        u8 r4;
        u8 r77;
        u8 temp;

        rt73usb_bbp_read(rt2x00dev, 3, &r3);
        rt73usb_bbp_read(rt2x00dev, 4, &r4);
        rt73usb_bbp_read(rt2x00dev, 77, &r77);

        rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, 0);

        /*
         * Configure the RX antenna.
         */
        switch (ant->rx) {
        case ANTENNA_HW_DIVERSITY:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
                temp = !rt2x00_has_cap_frame_type(rt2x00dev) &&
                       (rt2x00dev->curr_band != IEEE80211_BAND_5GHZ);
                rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, temp);
                break;
        case ANTENNA_A:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
                rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
                if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ)
                        rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
                else
                        rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
                break;
        case ANTENNA_B:
        default:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
                rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
                if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ)
                        rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
                else
                        rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
                break;
        }

        rt73usb_bbp_write(rt2x00dev, 77, r77);
        rt73usb_bbp_write(rt2x00dev, 3, r3);
        rt73usb_bbp_write(rt2x00dev, 4, r4);
}

static void rt73usb_config_antenna_2x(struct rt2x00_dev *rt2x00dev,
                                      struct antenna_setup *ant)
{
        u8 r3;
        u8 r4;
        u8 r77;

        rt73usb_bbp_read(rt2x00dev, 3, &r3);
        rt73usb_bbp_read(rt2x00dev, 4, &r4);
        rt73usb_bbp_read(rt2x00dev, 77, &r77);

        rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, 0);
        rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
                          !rt2x00_has_cap_frame_type(rt2x00dev));

        /*
         * Configure the RX antenna.
         */
        switch (ant->rx) {
        case ANTENNA_HW_DIVERSITY:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
                break;
        case ANTENNA_A:
                rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
                break;
        case ANTENNA_B:
        default:
                rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
                break;
        }

        rt73usb_bbp_write(rt2x00dev, 77, r77);
        rt73usb_bbp_write(rt2x00dev, 3, r3);
        rt73usb_bbp_write(rt2x00dev, 4, r4);
}

struct antenna_sel {
        u8 word;
        /*
         * value[0] -> non-LNA
         * value[1] -> LNA
         */
        u8 value[2];
};

static const struct antenna_sel antenna_sel_a[] = {
        { 96,  { 0x58, 0x78 } },
        { 104, { 0x38, 0x48 } },
        { 75,  { 0xfe, 0x80 } },
        { 86,  { 0xfe, 0x80 } },
        { 88,  { 0xfe, 0x80 } },
        { 35,  { 0x60, 0x60 } },
        { 97,  { 0x58, 0x58 } },
        { 98,  { 0x58, 0x58 } },
};

static const struct antenna_sel antenna_sel_bg[] = {
        { 96,  { 0x48, 0x68 } },
        { 104, { 0x2c, 0x3c } },
        { 75,  { 0xfe, 0x80 } },
        { 86,  { 0xfe, 0x80 } },
        { 88,  { 0xfe, 0x80 } },
        { 35,  { 0x50, 0x50 } },
        { 97,  { 0x48, 0x48 } },
        { 98,  { 0x48, 0x48 } },
};

static void rt73usb_config_ant(struct rt2x00_dev *rt2x00dev,
                               struct antenna_setup *ant)
{
        const struct antenna_sel *sel;
        unsigned int lna;
        unsigned int i;
        u32 reg;

        /*
         * We should never come here because rt2x00lib is supposed
         * to catch this and send us the correct antenna explicitely.
         */
        BUG_ON(ant->rx == ANTENNA_SW_DIVERSITY ||
               ant->tx == ANTENNA_SW_DIVERSITY);

        if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ) {
                sel = antenna_sel_a;
                lna = rt2x00_has_cap_external_lna_a(rt2x00dev);
        } else {
                sel = antenna_sel_bg;
                lna = rt2x00_has_cap_external_lna_bg(rt2x00dev);
        }

        for (i = 0; i < ARRAY_SIZE(antenna_sel_a); i++)
                rt73usb_bbp_write(rt2x00dev, sel[i].word, sel[i].value[lna]);

        rt2x00usb_register_read(rt2x00dev, PHY_CSR0, &reg);

        rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_BG,
                           (rt2x00dev->curr_band == IEEE80211_BAND_2GHZ));
        rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_A,
                           (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ));

        rt2x00usb_register_write(rt2x00dev, PHY_CSR0, reg);

        if (rt2x00_rf(rt2x00dev, RF5226) || rt2x00_rf(rt2x00dev, RF5225))
                rt73usb_config_antenna_5x(rt2x00dev, ant);
        else if (rt2x00_rf(rt2x00dev, RF2528) || rt2x00_rf(rt2x00dev, RF2527))
                rt73usb_config_antenna_2x(rt2x00dev, ant);
}

static void rt73usb_config_lna_gain(struct rt2x00_dev *rt2x00dev,
                                    struct rt2x00lib_conf *libconf)
{
        u16 eeprom;
        short lna_gain = 0;

        if (libconf->conf->chandef.chan->band == IEEE80211_BAND_2GHZ) {
                if (rt2x00_has_cap_external_lna_bg(rt2x00dev))
                        lna_gain += 14;

                rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
                lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
        } else {
                rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
                lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
        }

        rt2x00dev->lna_gain = lna_gain;
}

static void rt73usb_config_channel(struct rt2x00_dev *rt2x00dev,
                                   struct rf_channel *rf, const int txpower)
{
        u8 r3;
        u8 r94;
        u8 smart;

        rt2x00_set_field32(&rf->rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
        rt2x00_set_field32(&rf->rf4, RF4_FREQ_OFFSET, rt2x00dev->freq_offset);

        smart = !(rt2x00_rf(rt2x00dev, RF5225) || rt2x00_rf(rt2x00dev, RF2527));

        rt73usb_bbp_read(rt2x00dev, 3, &r3);
        rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, smart);
        rt73usb_bbp_write(rt2x00dev, 3, r3);

        r94 = 6;
        if (txpower > MAX_TXPOWER && txpower <= (MAX_TXPOWER + r94))
                r94 += txpower - MAX_TXPOWER;
        else if (txpower < MIN_TXPOWER && txpower >= (MIN_TXPOWER - r94))
                r94 += txpower;
        rt73usb_bbp_write(rt2x00dev, 94, r94);

        rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
        rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
        rt73usb_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
        rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

        rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
        rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
        rt73usb_rf_write(rt2x00dev, 3, rf->rf3 | 0x00000004);
        rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

        rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
        rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
        rt73usb_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
        rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

        udelay(10);
}

static void rt73usb_config_txpower(struct rt2x00_dev *rt2x00dev,
                                   const int txpower)
{
        struct rf_channel rf;

        rt2x00_rf_read(rt2x00dev, 1, &rf.rf1);
        rt2x00_rf_read(rt2x00dev, 2, &rf.rf2);
        rt2x00_rf_read(rt2x00dev, 3, &rf.rf3);
        rt2x00_rf_read(rt2x00dev, 4, &rf.rf4);

        rt73usb_config_channel(rt2x00dev, &rf, txpower);
}

static void rt73usb_config_retry_limit(struct rt2x00_dev *rt2x00dev,
                                       struct rt2x00lib_conf *libconf)
{
        u32 reg;

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR4_OFDM_TX_RATE_DOWN, 1);
        rt2x00_set_field32(&reg, TXRX_CSR4_OFDM_TX_RATE_STEP, 0);
        rt2x00_set_field32(&reg, TXRX_CSR4_OFDM_TX_FALLBACK_CCK, 0);
        rt2x00_set_field32(&reg, TXRX_CSR4_LONG_RETRY_LIMIT,
                           libconf->conf->long_frame_max_tx_count);
        rt2x00_set_field32(&reg, TXRX_CSR4_SHORT_RETRY_LIMIT,
                           libconf->conf->short_frame_max_tx_count);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR4, reg);
}

static void rt73usb_config_ps(struct rt2x00_dev *rt2x00dev,
                                struct rt2x00lib_conf *libconf)
{
        enum dev_state state =
            (libconf->conf->flags & IEEE80211_CONF_PS) ?
                STATE_SLEEP : STATE_AWAKE;
        u32 reg;

        if (state == STATE_SLEEP) {
                rt2x00usb_register_read(rt2x00dev, MAC_CSR11, &reg);
                rt2x00_set_field32(&reg, MAC_CSR11_DELAY_AFTER_TBCN,
                                   rt2x00dev->beacon_int - 10);
                rt2x00_set_field32(&reg, MAC_CSR11_TBCN_BEFORE_WAKEUP,
                                   libconf->conf->listen_interval - 1);
                rt2x00_set_field32(&reg, MAC_CSR11_WAKEUP_LATENCY, 5);

                /* We must first disable autowake before it can be enabled */
                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 0);
                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);

                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 1);
                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);

                rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0,
                                            USB_MODE_SLEEP, REGISTER_TIMEOUT);
        } else {
                rt2x00usb_register_read(rt2x00dev, MAC_CSR11, &reg);
                rt2x00_set_field32(&reg, MAC_CSR11_DELAY_AFTER_TBCN, 0);
                rt2x00_set_field32(&reg, MAC_CSR11_TBCN_BEFORE_WAKEUP, 0);
                rt2x00_set_field32(&reg, MAC_CSR11_AUTOWAKE, 0);
                rt2x00_set_field32(&reg, MAC_CSR11_WAKEUP_LATENCY, 0);
                rt2x00usb_register_write(rt2x00dev, MAC_CSR11, reg);

                rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0,
                                            USB_MODE_WAKEUP, REGISTER_TIMEOUT);
        }
}

static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
                           struct rt2x00lib_conf *libconf,
                           const unsigned int flags)
{
        /* Always recalculate LNA gain before changing configuration */
        rt73usb_config_lna_gain(rt2x00dev, libconf);

        if (flags & IEEE80211_CONF_CHANGE_CHANNEL)
                rt73usb_config_channel(rt2x00dev, &libconf->rf,
                                       libconf->conf->power_level);
        if ((flags & IEEE80211_CONF_CHANGE_POWER) &&
            !(flags & IEEE80211_CONF_CHANGE_CHANNEL))
                rt73usb_config_txpower(rt2x00dev, libconf->conf->power_level);
        if (flags & IEEE80211_CONF_CHANGE_RETRY_LIMITS)
                rt73usb_config_retry_limit(rt2x00dev, libconf);
        if (flags & IEEE80211_CONF_CHANGE_PS)
                rt73usb_config_ps(rt2x00dev, libconf);
}

/*
 * Link tuning
 */
static void rt73usb_link_stats(struct rt2x00_dev *rt2x00dev,
                               struct link_qual *qual)
{
        u32 reg;

        /*
         * Update FCS error count from register.
         */
        rt2x00usb_register_read(rt2x00dev, STA_CSR0, &reg);
        qual->rx_failed = rt2x00_get_field32(reg, STA_CSR0_FCS_ERROR);

        /*
         * Update False CCA count from register.
         */
        rt2x00usb_register_read(rt2x00dev, STA_CSR1, &reg);
        qual->false_cca = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
}

static inline void rt73usb_set_vgc(struct rt2x00_dev *rt2x00dev,
                                   struct link_qual *qual, u8 vgc_level)
{
        if (qual->vgc_level != vgc_level) {
                rt73usb_bbp_write(rt2x00dev, 17, vgc_level);
                qual->vgc_level = vgc_level;
                qual->vgc_level_reg = vgc_level;
        }
}

static void rt73usb_reset_tuner(struct rt2x00_dev *rt2x00dev,
                                struct link_qual *qual)
{
        rt73usb_set_vgc(rt2x00dev, qual, 0x20);
}

static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev,
                               struct link_qual *qual, const u32 count)
{
        u8 up_bound;
        u8 low_bound;

        /*
         * Determine r17 bounds.
         */
        if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ) {
                low_bound = 0x28;
                up_bound = 0x48;

                if (rt2x00_has_cap_external_lna_a(rt2x00dev)) {
                        low_bound += 0x10;
                        up_bound += 0x10;
                }
        } else {
                if (qual->rssi > -82) {
                        low_bound = 0x1c;
                        up_bound = 0x40;
                } else if (qual->rssi > -84) {
                        low_bound = 0x1c;
                        up_bound = 0x20;
                } else {
                        low_bound = 0x1c;
                        up_bound = 0x1c;
                }

                if (rt2x00_has_cap_external_lna_bg(rt2x00dev)) {
                        low_bound += 0x14;
                        up_bound += 0x10;
                }
        }

        /*
         * If we are not associated, we should go straight to the
         * dynamic CCA tuning.
         */
        if (!rt2x00dev->intf_associated)
                goto dynamic_cca_tune;

        /*
         * Special big-R17 for very short distance
         */
        if (qual->rssi > -35) {
                rt73usb_set_vgc(rt2x00dev, qual, 0x60);
                return;
        }

        /*
         * Special big-R17 for short distance
         */
        if (qual->rssi >= -58) {
                rt73usb_set_vgc(rt2x00dev, qual, up_bound);
                return;
        }

        /*
         * Special big-R17 for middle-short distance
         */
        if (qual->rssi >= -66) {
                rt73usb_set_vgc(rt2x00dev, qual, low_bound + 0x10);
                return;
        }

        /*
         * Special mid-R17 for middle distance
         */
        if (qual->rssi >= -74) {
                rt73usb_set_vgc(rt2x00dev, qual, low_bound + 0x08);
                return;
        }

        /*
         * Special case: Change up_bound based on the rssi.
         * Lower up_bound when rssi is weaker then -74 dBm.
         */
        up_bound -= 2 * (-74 - qual->rssi);
        if (low_bound > up_bound)
                up_bound = low_bound;

        if (qual->vgc_level > up_bound) {
                rt73usb_set_vgc(rt2x00dev, qual, up_bound);
                return;
        }

dynamic_cca_tune:

        /*
         * r17 does not yet exceed upper limit, continue and base
         * the r17 tuning on the false CCA count.
         */
        if ((qual->false_cca > 512) && (qual->vgc_level < up_bound))
                rt73usb_set_vgc(rt2x00dev, qual,
                                min_t(u8, qual->vgc_level + 4, up_bound));
        else if ((qual->false_cca < 100) && (qual->vgc_level > low_bound))
                rt73usb_set_vgc(rt2x00dev, qual,
                                max_t(u8, qual->vgc_level - 4, low_bound));
}

/*
 * Queue handlers.
 */
static void rt73usb_start_queue(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        u32 reg;

        switch (queue->qid) {
        case QID_RX:
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX, 0);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);
                break;
        case QID_BEACON:
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 1);
                rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 1);
                rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 1);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
                break;
        default:
                break;
        }
}

static void rt73usb_stop_queue(struct data_queue *queue)
{
        struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
        u32 reg;

        switch (queue->qid) {
        case QID_RX:
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX, 1);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);
                break;
        case QID_BEACON:
                rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
                rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 0);
                rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 0);
                rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
                break;
        default:
                break;
        }
}

/*
 * Firmware functions
 */
static char *rt73usb_get_firmware_name(struct rt2x00_dev *rt2x00dev)
{
        return FIRMWARE_RT2571;
}

static int rt73usb_check_firmware(struct rt2x00_dev *rt2x00dev,
                                  const u8 *data, const size_t len)
{
        u16 fw_crc;
        u16 crc;

        /*
         * Only support 2kb firmware files.
         */
        if (len != 2048)
                return FW_BAD_LENGTH;

        /*
         * The last 2 bytes in the firmware array are the crc checksum itself,
         * this means that we should never pass those 2 bytes to the crc
         * algorithm.
         */
        fw_crc = (data[len - 2] << 8 | data[len - 1]);

        /*
         * Use the crc itu-t algorithm.
         */
        crc = crc_itu_t(0, data, len - 2);
        crc = crc_itu_t_byte(crc, 0);
        crc = crc_itu_t_byte(crc, 0);

        return (fw_crc == crc) ? FW_OK : FW_BAD_CRC;
}

static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev,
                                 const u8 *data, const size_t len)
{
        unsigned int i;
        int status;
        u32 reg;

        /*
         * Wait for stable hardware.
         */
        for (i = 0; i < 100; i++) {
                rt2x00usb_register_read(rt2x00dev, MAC_CSR0, &reg);
                if (reg)
                        break;
                msleep(1);
        }

        if (!reg) {
                rt2x00_err(rt2x00dev, "Unstable hardware\n");
                return -EBUSY;
        }

        /*
         * Write firmware to device.
         */
        rt2x00usb_register_multiwrite(rt2x00dev, FIRMWARE_IMAGE_BASE, data, len);

        /*
         * Send firmware request to device to load firmware,
         * we need to specify a long timeout time.
         */
        status = rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE,
                                             0, USB_MODE_FIRMWARE,
                                             REGISTER_TIMEOUT_FIRMWARE);
        if (status < 0) {
                rt2x00_err(rt2x00dev, "Failed to write Firmware to device\n");
                return status;
        }

        return 0;
}

/*
 * Initialization functions.
 */
static int rt73usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR0_AUTO_TX_SEQ, 1);
        rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX, 0);
        rt2x00_set_field32(&reg, TXRX_CSR0_TX_WITHOUT_WAITING, 0);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID0, 47); /* CCK Signal */
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID0_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID1, 30); /* Rssi */
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID1_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID2, 42); /* OFDM Rate */
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID2_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID3, 30); /* Rssi */
        rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID3_VALID, 1);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR1, reg);

        /*
         * CCK TXD BBP registers
         */
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID0, 13);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID0_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID1, 12);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID1_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID2, 11);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID2_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID3, 10);
        rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID3_VALID, 1);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR2, reg);

        /*
         * OFDM TXD BBP registers
         */
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR3, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID0, 7);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID0_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID1, 6);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID1_VALID, 1);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID2, 5);
        rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID2_VALID, 1);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR3, reg);

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR7, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_6MBS, 59);
        rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_9MBS, 53);
        rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_12MBS, 49);
        rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_18MBS, 46);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR7, reg);

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR8, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_24MBS, 44);
        rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_36MBS, 42);
        rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_48MBS, 42);
        rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_54MBS, 42);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR8, reg);

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
        rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_INTERVAL, 0);
        rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 0);
        rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, 0);
        rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 0);
        rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
        rt2x00_set_field32(&reg, TXRX_CSR9_TIMESTAMP_COMPENSATE, 0);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);

        rt2x00usb_register_write(rt2x00dev, TXRX_CSR15, 0x0000000f);

        rt2x00usb_register_read(rt2x00dev, MAC_CSR6, &reg);
        rt2x00_set_field32(&reg, MAC_CSR6_MAX_FRAME_UNIT, 0xfff);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR6, reg);

        rt2x00usb_register_write(rt2x00dev, MAC_CSR10, 0x00000718);

        if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
                return -EBUSY;

        rt2x00usb_register_write(rt2x00dev, MAC_CSR13, 0x00007f00);

        /*
         * Invalidate all Shared Keys (SEC_CSR0),
         * and clear the Shared key Cipher algorithms (SEC_CSR1 & SEC_CSR5)
         */
        rt2x00usb_register_write(rt2x00dev, SEC_CSR0, 0x00000000);
        rt2x00usb_register_write(rt2x00dev, SEC_CSR1, 0x00000000);
        rt2x00usb_register_write(rt2x00dev, SEC_CSR5, 0x00000000);

        reg = 0x000023b0;
        if (rt2x00_rf(rt2x00dev, RF5225) || rt2x00_rf(rt2x00dev, RF2527))
                rt2x00_set_field32(&reg, PHY_CSR1_RF_RPI, 1);
        rt2x00usb_register_write(rt2x00dev, PHY_CSR1, reg);

        rt2x00usb_register_write(rt2x00dev, PHY_CSR5, 0x00040a06);
        rt2x00usb_register_write(rt2x00dev, PHY_CSR6, 0x00080606);
        rt2x00usb_register_write(rt2x00dev, PHY_CSR7, 0x00000408);

        rt2x00usb_register_read(rt2x00dev, MAC_CSR9, &reg);
        rt2x00_set_field32(&reg, MAC_CSR9_CW_SELECT, 0);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR9, reg);

        /*
         * Clear all beacons
         * For the Beacon base registers we only need to clear
         * the first byte since that byte contains the VALID and OWNER
         * bits which (when set to 0) will invalidate the entire beacon.
         */
        rt2x00usb_register_write(rt2x00dev, HW_BEACON_BASE0, 0);
        rt2x00usb_register_write(rt2x00dev, HW_BEACON_BASE1, 0);
        rt2x00usb_register_write(rt2x00dev, HW_BEACON_BASE2, 0);
        rt2x00usb_register_write(rt2x00dev, HW_BEACON_BASE3, 0);

        /*
         * We must clear the error counters.
         * These registers are cleared on read,
         * so we may pass a useless variable to store the value.
         */
        rt2x00usb_register_read(rt2x00dev, STA_CSR0, &reg);
        rt2x00usb_register_read(rt2x00dev, STA_CSR1, &reg);
        rt2x00usb_register_read(rt2x00dev, STA_CSR2, &reg);

        /*
         * Reset MAC and BBP registers.
         */
        rt2x00usb_register_read(rt2x00dev, MAC_CSR1, &reg);
        rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 1);
        rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 1);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR1, reg);

        rt2x00usb_register_read(rt2x00dev, MAC_CSR1, &reg);
        rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 0);
        rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 0);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR1, reg);

        rt2x00usb_register_read(rt2x00dev, MAC_CSR1, &reg);
        rt2x00_set_field32(&reg, MAC_CSR1_HOST_READY, 1);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR1, reg);

        return 0;
}

static int rt73usb_wait_bbp_ready(struct rt2x00_dev *rt2x00dev)
{
        unsigned int i;
        u8 value;

        for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) {
                rt73usb_bbp_read(rt2x00dev, 0, &value);
                if ((value != 0xff) && (value != 0x00))
                        return 0;
                udelay(REGISTER_BUSY_DELAY);
        }

        rt2x00_err(rt2x00dev, "BBP register access failed, aborting\n");
        return -EACCES;
}

static int rt73usb_init_bbp(struct rt2x00_dev *rt2x00dev)
{
        unsigned int i;
        u16 eeprom;
        u8 reg_id;
        u8 value;

        if (unlikely(rt73usb_wait_bbp_ready(rt2x00dev)))
                return -EACCES;

        rt73usb_bbp_write(rt2x00dev, 3, 0x80);
        rt73usb_bbp_write(rt2x00dev, 15, 0x30);
        rt73usb_bbp_write(rt2x00dev, 21, 0xc8);
        rt73usb_bbp_write(rt2x00dev, 22, 0x38);
        rt73usb_bbp_write(rt2x00dev, 23, 0x06);
        rt73usb_bbp_write(rt2x00dev, 24, 0xfe);
        rt73usb_bbp_write(rt2x00dev, 25, 0x0a);
        rt73usb_bbp_write(rt2x00dev, 26, 0x0d);
        rt73usb_bbp_write(rt2x00dev, 32, 0x0b);
        rt73usb_bbp_write(rt2x00dev, 34, 0x12);
        rt73usb_bbp_write(rt2x00dev, 37, 0x07);
        rt73usb_bbp_write(rt2x00dev, 39, 0xf8);
        rt73usb_bbp_write(rt2x00dev, 41, 0x60);
        rt73usb_bbp_write(rt2x00dev, 53, 0x10);
        rt73usb_bbp_write(rt2x00dev, 54, 0x18);
        rt73usb_bbp_write(rt2x00dev, 60, 0x10);
        rt73usb_bbp_write(rt2x00dev, 61, 0x04);
        rt73usb_bbp_write(rt2x00dev, 62, 0x04);
        rt73usb_bbp_write(rt2x00dev, 75, 0xfe);
        rt73usb_bbp_write(rt2x00dev, 86, 0xfe);
        rt73usb_bbp_write(rt2x00dev, 88, 0xfe);
        rt73usb_bbp_write(rt2x00dev, 90, 0x0f);
        rt73usb_bbp_write(rt2x00dev, 99, 0x00);
        rt73usb_bbp_write(rt2x00dev, 102, 0x16);
        rt73usb_bbp_write(rt2x00dev, 107, 0x04);

        for (i = 0; i < EEPROM_BBP_SIZE; i++) {
                rt2x00_eeprom_read(rt2x00dev, EEPROM_BBP_START + i, &eeprom);

                if (eeprom != 0xffff && eeprom != 0x0000) {
                        reg_id = rt2x00_get_field16(eeprom, EEPROM_BBP_REG_ID);
                        value = rt2x00_get_field16(eeprom, EEPROM_BBP_VALUE);
                        rt73usb_bbp_write(rt2x00dev, reg_id, value);
                }
        }

        return 0;
}

/*
 * Device state switch handlers.
 */
static int rt73usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
        /*
         * Initialize all registers.
         */
        if (unlikely(rt73usb_init_registers(rt2x00dev) ||
                     rt73usb_init_bbp(rt2x00dev)))
                return -EIO;

        return 0;
}

static void rt73usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
        rt2x00usb_register_write(rt2x00dev, MAC_CSR10, 0x00001818);

        /*
         * Disable synchronisation.
         */
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, 0);

        rt2x00usb_disable_radio(rt2x00dev);
}

static int rt73usb_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
{
        u32 reg, reg2;
        unsigned int i;
        char put_to_sleep;

        put_to_sleep = (state != STATE_AWAKE);

        rt2x00usb_register_read(rt2x00dev, MAC_CSR12, &reg);
        rt2x00_set_field32(&reg, MAC_CSR12_FORCE_WAKEUP, !put_to_sleep);
        rt2x00_set_field32(&reg, MAC_CSR12_PUT_TO_SLEEP, put_to_sleep);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR12, reg);

        /*
         * Device is not guaranteed to be in the requested state yet.
         * We must wait until the register indicates that the
         * device has entered the correct state.
         */
        for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
                rt2x00usb_register_read(rt2x00dev, MAC_CSR12, &reg2);
                state = rt2x00_get_field32(reg2, MAC_CSR12_BBP_CURRENT_STATE);
                if (state == !put_to_sleep)
                        return 0;
                rt2x00usb_register_write(rt2x00dev, MAC_CSR12, reg);
                msleep(10);
        }

        return -EBUSY;
}

static int rt73usb_set_device_state(struct rt2x00_dev *rt2x00dev,
                                    enum dev_state state)
{
        int retval = 0;

        switch (state) {
        case STATE_RADIO_ON:
                retval = rt73usb_enable_radio(rt2x00dev);
                break;
        case STATE_RADIO_OFF:
                rt73usb_disable_radio(rt2x00dev);
                break;
        case STATE_RADIO_IRQ_ON:
        case STATE_RADIO_IRQ_OFF:
                /* No support, but no error either */
                break;
        case STATE_DEEP_SLEEP:
        case STATE_SLEEP:
        case STATE_STANDBY:
        case STATE_AWAKE:
                retval = rt73usb_set_state(rt2x00dev, state);
                break;
        default:
                retval = -ENOTSUPP;
                break;
        }

        if (unlikely(retval))
                rt2x00_err(rt2x00dev, "Device failed to enter state %d (%d)\n",
                           state, retval);

        return retval;
}

/*
 * TX descriptor initialization
 */
static void rt73usb_write_tx_desc(struct queue_entry *entry,
                                  struct txentry_desc *txdesc)
{
        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
        __le32 *txd = (__le32 *) entry->skb->data;
        u32 word;

        /*
         * Start writing the descriptor words.
         */
        rt2x00_desc_read(txd, 0, &word);
        rt2x00_set_field32(&word, TXD_W0_BURST,
                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_VALID, 1);
        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_ACK,
                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_OFDM,
                           (txdesc->rate_mode == RATE_MODE_OFDM));
        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->u.plcp.ifs);
        rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
                           test_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_TKIP_MIC,
                           test_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_KEY_TABLE,
                           test_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_KEY_INDEX, txdesc->key_idx);
        rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, txdesc->length);
        rt2x00_set_field32(&word, TXD_W0_BURST2,
                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_CIPHER_ALG, txdesc->cipher);
        rt2x00_desc_write(txd, 0, word);

        rt2x00_desc_read(txd, 1, &word);
        rt2x00_set_field32(&word, TXD_W1_HOST_Q_ID, entry->queue->qid);
        rt2x00_set_field32(&word, TXD_W1_AIFSN, entry->queue->aifs);
        rt2x00_set_field32(&word, TXD_W1_CWMIN, entry->queue->cw_min);
        rt2x00_set_field32(&word, TXD_W1_CWMAX, entry->queue->cw_max);
        rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, txdesc->iv_offset);
        rt2x00_set_field32(&word, TXD_W1_HW_SEQUENCE,
                           test_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags));
        rt2x00_desc_write(txd, 1, word);

        rt2x00_desc_read(txd, 2, &word);
        rt2x00_set_field32(&word, TXD_W2_PLCP_SIGNAL, txdesc->u.plcp.signal);
        rt2x00_set_field32(&word, TXD_W2_PLCP_SERVICE, txdesc->u.plcp.service);
        rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_LOW,
                           txdesc->u.plcp.length_low);
        rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_HIGH,
                           txdesc->u.plcp.length_high);
        rt2x00_desc_write(txd, 2, word);

        if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags)) {
                _rt2x00_desc_write(txd, 3, skbdesc->iv[0]);
                _rt2x00_desc_write(txd, 4, skbdesc->iv[1]);
        }

        rt2x00_desc_read(txd, 5, &word);
        rt2x00_set_field32(&word, TXD_W5_TX_POWER,
                           TXPOWER_TO_DEV(entry->queue->rt2x00dev->tx_power));
        rt2x00_set_field32(&word, TXD_W5_WAITING_DMA_DONE_INT, 1);
        rt2x00_desc_write(txd, 5, word);

        /*
         * Register descriptor details in skb frame descriptor.
         */
        skbdesc->flags |= SKBDESC_DESC_IN_SKB;
        skbdesc->desc = txd;
        skbdesc->desc_len = TXD_DESC_SIZE;
}

/*
 * TX data initialization
 */
static void rt73usb_write_beacon(struct queue_entry *entry,
                                 struct txentry_desc *txdesc)
{
        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
        unsigned int beacon_base;
        unsigned int padding_len;
        u32 orig_reg, reg;

        /*
         * Disable beaconing while we are reloading the beacon data,
         * otherwise we might be sending out invalid data.
         */
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
        orig_reg = reg;
        rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);

        /*
         * Add space for the descriptor in front of the skb.
         */
        skb_push(entry->skb, TXD_DESC_SIZE);
        memset(entry->skb->data, 0, TXD_DESC_SIZE);

        /*
         * Write the TX descriptor for the beacon.
         */
        rt73usb_write_tx_desc(entry, txdesc);

        /*
         * Dump beacon to userspace through debugfs.
         */
        rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_BEACON, entry->skb);

        /*
         * Write entire beacon with descriptor and padding to register.
         */
        padding_len = roundup(entry->skb->len, 4) - entry->skb->len;
        if (padding_len && skb_pad(entry->skb, padding_len)) {
                rt2x00_err(rt2x00dev, "Failure padding beacon, aborting\n");
                /* skb freed by skb_pad() on failure */
                entry->skb = NULL;
                rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, orig_reg);
                return;
        }

        beacon_base = HW_BEACON_OFFSET(entry->entry_idx);
        rt2x00usb_register_multiwrite(rt2x00dev, beacon_base, entry->skb->data,
                                      entry->skb->len + padding_len);

        /*
         * Enable beaconing again.
         *
         * For Wi-Fi faily generated beacons between participating stations.
         * Set TBTT phase adaptive adjustment step to 8us (default 16us)
         */
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR10, 0x00001008);

        rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 1);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);

        /*
         * Clean up the beacon skb.
         */
        dev_kfree_skb(entry->skb);
        entry->skb = NULL;
}

static void rt73usb_clear_beacon(struct queue_entry *entry)
{
        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
        unsigned int beacon_base;
        u32 orig_reg, reg;

        /*
         * Disable beaconing while we are reloading the beacon data,
         * otherwise we might be sending out invalid data.
         */
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &orig_reg);
        reg = orig_reg;
        rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);

        /*
         * Clear beacon.
         */
        beacon_base = HW_BEACON_OFFSET(entry->entry_idx);
        rt2x00usb_register_write(rt2x00dev, beacon_base, 0);

        /*
         * Restore beaconing state.
         */
        rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, orig_reg);
}

static int rt73usb_get_tx_data_len(struct queue_entry *entry)
{
        int length;

        /*
         * The length _must_ be a multiple of 4,
         * but it must _not_ be a multiple of the USB packet size.
         */
        length = roundup(entry->skb->len, 4);
        length += (4 * !(length % entry->queue->usb_maxpacket));

        return length;
}

/*
 * RX control handlers
 */
static int rt73usb_agc_to_rssi(struct rt2x00_dev *rt2x00dev, int rxd_w1)
{
        u8 offset = rt2x00dev->lna_gain;
        u8 lna;

        lna = rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_LNA);
        switch (lna) {
        case 3:
                offset += 90;
                break;
        case 2:
                offset += 74;
                break;
        case 1:
                offset += 64;
                break;
        default:
                return 0;
        }

        if (rt2x00dev->curr_band == IEEE80211_BAND_5GHZ) {
                if (rt2x00_has_cap_external_lna_a(rt2x00dev)) {
                        if (lna == 3 || lna == 2)
                                offset += 10;
                } else {
                        if (lna == 3)
                                offset += 6;
                        else if (lna == 2)
                                offset += 8;
                }
        }

        return rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_AGC) * 2 - offset;
}

static void rt73usb_fill_rxdone(struct queue_entry *entry,
                                struct rxdone_entry_desc *rxdesc)
{
        struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
        struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
        __le32 *rxd = (__le32 *)entry->skb->data;
        u32 word0;
        u32 word1;

        /*
         * Copy descriptor to the skbdesc->desc buffer, making it safe from moving of
         * frame data in rt2x00usb.
         */
        memcpy(skbdesc->desc, rxd, skbdesc->desc_len);
        rxd = (__le32 *)skbdesc->desc;

        /*
         * It is now safe to read the descriptor on all architectures.
         */
        rt2x00_desc_read(rxd, 0, &word0);
        rt2x00_desc_read(rxd, 1, &word1);

        if (rt2x00_get_field32(word0, RXD_W0_CRC_ERROR))
                rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;

        rxdesc->cipher = rt2x00_get_field32(word0, RXD_W0_CIPHER_ALG);
        rxdesc->cipher_status = rt2x00_get_field32(word0, RXD_W0_CIPHER_ERROR);

        if (rxdesc->cipher != CIPHER_NONE) {
                _rt2x00_desc_read(rxd, 2, &rxdesc->iv[0]);
                _rt2x00_desc_read(rxd, 3, &rxdesc->iv[1]);
                rxdesc->dev_flags |= RXDONE_CRYPTO_IV;

                _rt2x00_desc_read(rxd, 4, &rxdesc->icv);
                rxdesc->dev_flags |= RXDONE_CRYPTO_ICV;

                /*
                 * Hardware has stripped IV/EIV data from 802.11 frame during
                 * decryption. It has provided the data separately but rt2x00lib
                 * should decide if it should be reinserted.
                 */
                rxdesc->flags |= RX_FLAG_IV_STRIPPED;

                /*
                 * The hardware has already checked the Michael Mic and has
                 * stripped it from the frame. Signal this to mac80211.
                 */
                rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;

                if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
                        rxdesc->flags |= RX_FLAG_DECRYPTED;
                else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
                        rxdesc->flags |= RX_FLAG_MMIC_ERROR;
        }

        /*
         * Obtain the status about this packet.
         * 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 100kbit/s.
         */
        rxdesc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
        rxdesc->rssi = rt73usb_agc_to_rssi(rt2x00dev, word1);
        rxdesc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);

        if (rt2x00_get_field32(word0, RXD_W0_OFDM))
                rxdesc->dev_flags |= RXDONE_SIGNAL_PLCP;
        else
                rxdesc->dev_flags |= RXDONE_SIGNAL_BITRATE;
        if (rt2x00_get_field32(word0, RXD_W0_MY_BSS))
                rxdesc->dev_flags |= RXDONE_MY_BSS;

        /*
         * Set skb pointers, and update frame information.
         */
        skb_pull(entry->skb, entry->queue->desc_size);
        skb_trim(entry->skb, rxdesc->size);
}

/*
 * Device probe functions.
 */
static int rt73usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
{
        u16 word;
        u8 *mac;
        s8 value;

        rt2x00usb_eeprom_read(rt2x00dev, rt2x00dev->eeprom, EEPROM_SIZE);

        /*
         * Start validation of the data that has been read.
         */
        mac = rt2x00_eeprom_addr(rt2x00dev, EEPROM_MAC_ADDR_0);
        if (!is_valid_ether_addr(mac)) {
                eth_random_addr(mac);
                rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", mac);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_ANTENNA, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_ANTENNA_NUM, 2);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_TX_DEFAULT,
                                   ANTENNA_B);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_RX_DEFAULT,
                                   ANTENNA_B);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_FRAME_TYPE, 0);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_DYN_TXAGC, 0);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_HARDWARE_RADIO, 0);
                rt2x00_set_field16(&word, EEPROM_ANTENNA_RF_TYPE, RF5226);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_ANTENNA, word);
                rt2x00_eeprom_dbg(rt2x00dev, "Antenna: 0x%04x\n", word);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_NIC_EXTERNAL_LNA, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_NIC, word);
                rt2x00_eeprom_dbg(rt2x00dev, "NIC: 0x%04x\n", word);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_LED, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_RDY_G, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_RDY_A, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_ACT, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_GPIO_0, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_GPIO_1, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_GPIO_2, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_GPIO_3, 0);
                rt2x00_set_field16(&word, EEPROM_LED_POLARITY_GPIO_4, 0);
                rt2x00_set_field16(&word, EEPROM_LED_LED_MODE,
                                   LED_MODE_DEFAULT);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_LED, word);
                rt2x00_eeprom_dbg(rt2x00dev, "Led: 0x%04x\n", word);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_FREQ, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_FREQ_OFFSET, 0);
                rt2x00_set_field16(&word, EEPROM_FREQ_SEQ, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_FREQ, word);
                rt2x00_eeprom_dbg(rt2x00dev, "Freq: 0x%04x\n", word);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_BG_1, 0);
                rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_BG_2, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_RSSI_OFFSET_BG, word);
                rt2x00_eeprom_dbg(rt2x00dev, "RSSI OFFSET BG: 0x%04x\n", word);
        } else {
                value = rt2x00_get_field16(word, EEPROM_RSSI_OFFSET_BG_1);
                if (value < -10 || value > 10)
                        rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_BG_1, 0);
                value = rt2x00_get_field16(word, EEPROM_RSSI_OFFSET_BG_2);
                if (value < -10 || value > 10)
                        rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_BG_2, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_RSSI_OFFSET_BG, word);
        }

        rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &word);
        if (word == 0xffff) {
                rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_A_1, 0);
                rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_A_2, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_RSSI_OFFSET_A, word);
                rt2x00_eeprom_dbg(rt2x00dev, "RSSI OFFSET A: 0x%04x\n", word);
        } else {
                value = rt2x00_get_field16(word, EEPROM_RSSI_OFFSET_A_1);
                if (value < -10 || value > 10)
                        rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_A_1, 0);
                value = rt2x00_get_field16(word, EEPROM_RSSI_OFFSET_A_2);
                if (value < -10 || value > 10)
                        rt2x00_set_field16(&word, EEPROM_RSSI_OFFSET_A_2, 0);
                rt2x00_eeprom_write(rt2x00dev, EEPROM_RSSI_OFFSET_A, word);
        }

        return 0;
}

static int rt73usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;
        u16 value;
        u16 eeprom;

        /*
         * Read EEPROM word for configuration.
         */
        rt2x00_eeprom_read(rt2x00dev, EEPROM_ANTENNA, &eeprom);

        /*
         * Identify RF chipset.
         */
        value = rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RF_TYPE);
        rt2x00usb_register_read(rt2x00dev, MAC_CSR0, &reg);
        rt2x00_set_chip(rt2x00dev, rt2x00_get_field32(reg, MAC_CSR0_CHIPSET),
                        value, rt2x00_get_field32(reg, MAC_CSR0_REVISION));

        if (!rt2x00_rt(rt2x00dev, RT2573) || (rt2x00_rev(rt2x00dev) == 0)) {
                rt2x00_err(rt2x00dev, "Invalid RT chipset detected\n");
                return -ENODEV;
        }

        if (!rt2x00_rf(rt2x00dev, RF5226) &&
            !rt2x00_rf(rt2x00dev, RF2528) &&
            !rt2x00_rf(rt2x00dev, RF5225) &&
            !rt2x00_rf(rt2x00dev, RF2527)) {
                rt2x00_err(rt2x00dev, "Invalid RF chipset detected\n");
                return -ENODEV;
        }

        /*
         * Identify default antenna configuration.
         */
        rt2x00dev->default_ant.tx =
            rt2x00_get_field16(eeprom, EEPROM_ANTENNA_TX_DEFAULT);
        rt2x00dev->default_ant.rx =
            rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RX_DEFAULT);

        /*
         * Read the Frame type.
         */
        if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_FRAME_TYPE))
                __set_bit(CAPABILITY_FRAME_TYPE, &rt2x00dev->cap_flags);

        /*
         * Detect if this device has an hardware controlled radio.
         */
        if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_HARDWARE_RADIO))
                __set_bit(CAPABILITY_HW_BUTTON, &rt2x00dev->cap_flags);

        /*
         * Read frequency offset.
         */
        rt2x00_eeprom_read(rt2x00dev, EEPROM_FREQ, &eeprom);
        rt2x00dev->freq_offset = rt2x00_get_field16(eeprom, EEPROM_FREQ_OFFSET);

        /*
         * Read external LNA informations.
         */
        rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &eeprom);

        if (rt2x00_get_field16(eeprom, EEPROM_NIC_EXTERNAL_LNA)) {
                __set_bit(CAPABILITY_EXTERNAL_LNA_A, &rt2x00dev->cap_flags);
                __set_bit(CAPABILITY_EXTERNAL_LNA_BG, &rt2x00dev->cap_flags);
        }

        /*
         * Store led settings, for correct led behaviour.
         */
#ifdef CONFIG_RT2X00_LIB_LEDS
        rt2x00_eeprom_read(rt2x00dev, EEPROM_LED, &eeprom);

        rt73usb_init_led(rt2x00dev, &rt2x00dev->led_radio, LED_TYPE_RADIO);
        rt73usb_init_led(rt2x00dev, &rt2x00dev->led_assoc, LED_TYPE_ASSOC);
        if (value == LED_MODE_SIGNAL_STRENGTH)
                rt73usb_init_led(rt2x00dev, &rt2x00dev->led_qual,
                                 LED_TYPE_QUALITY);

        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_LED_MODE, value);
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_GPIO_0,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_GPIO_0));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_GPIO_1,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_GPIO_1));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_GPIO_2,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_GPIO_2));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_GPIO_3,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_GPIO_3));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_GPIO_4,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_GPIO_4));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_ACT,
                           rt2x00_get_field16(eeprom, EEPROM_LED_POLARITY_ACT));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_READY_BG,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_RDY_G));
        rt2x00_set_field16(&rt2x00dev->led_mcu_reg, MCU_LEDCS_POLARITY_READY_A,
                           rt2x00_get_field16(eeprom,
                                              EEPROM_LED_POLARITY_RDY_A));
#endif /* CONFIG_RT2X00_LIB_LEDS */

        return 0;
}

/*
 * RF value list for RF2528
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2528[] = {
        { 1,  0x00002c0c, 0x00000786, 0x00068255, 0x000fea0b },
        { 2,  0x00002c0c, 0x00000786, 0x00068255, 0x000fea1f },
        { 3,  0x00002c0c, 0x0000078a, 0x00068255, 0x000fea0b },
        { 4,  0x00002c0c, 0x0000078a, 0x00068255, 0x000fea1f },
        { 5,  0x00002c0c, 0x0000078e, 0x00068255, 0x000fea0b },
        { 6,  0x00002c0c, 0x0000078e, 0x00068255, 0x000fea1f },
        { 7,  0x00002c0c, 0x00000792, 0x00068255, 0x000fea0b },
        { 8,  0x00002c0c, 0x00000792, 0x00068255, 0x000fea1f },
        { 9,  0x00002c0c, 0x00000796, 0x00068255, 0x000fea0b },
        { 10, 0x00002c0c, 0x00000796, 0x00068255, 0x000fea1f },
        { 11, 0x00002c0c, 0x0000079a, 0x00068255, 0x000fea0b },
        { 12, 0x00002c0c, 0x0000079a, 0x00068255, 0x000fea1f },
        { 13, 0x00002c0c, 0x0000079e, 0x00068255, 0x000fea0b },
        { 14, 0x00002c0c, 0x000007a2, 0x00068255, 0x000fea13 },
};

/*
 * RF value list for RF5226
 * Supports: 2.4 GHz & 5.2 GHz
 */
static const struct rf_channel rf_vals_5226[] = {
        { 1,  0x00002c0c, 0x00000786, 0x00068255, 0x000fea0b },
        { 2,  0x00002c0c, 0x00000786, 0x00068255, 0x000fea1f },
        { 3,  0x00002c0c, 0x0000078a, 0x00068255, 0x000fea0b },
        { 4,  0x00002c0c, 0x0000078a, 0x00068255, 0x000fea1f },
        { 5,  0x00002c0c, 0x0000078e, 0x00068255, 0x000fea0b },
        { 6,  0x00002c0c, 0x0000078e, 0x00068255, 0x000fea1f },
        { 7,  0x00002c0c, 0x00000792, 0x00068255, 0x000fea0b },
        { 8,  0x00002c0c, 0x00000792, 0x00068255, 0x000fea1f },
        { 9,  0x00002c0c, 0x00000796, 0x00068255, 0x000fea0b },
        { 10, 0x00002c0c, 0x00000796, 0x00068255, 0x000fea1f },
        { 11, 0x00002c0c, 0x0000079a, 0x00068255, 0x000fea0b },
        { 12, 0x00002c0c, 0x0000079a, 0x00068255, 0x000fea1f },
        { 13, 0x00002c0c, 0x0000079e, 0x00068255, 0x000fea0b },

        { 14, 0x00002c0c, 0x000007a2, 0x00068255, 0x000fea13 },

        /* 802.11 UNI / HyperLan 2 */
        { 36, 0x00002c0c, 0x0000099a, 0x00098255, 0x000fea23 },
        { 40, 0x00002c0c, 0x000009a2, 0x00098255, 0x000fea03 },
        { 44, 0x00002c0c, 0x000009a6, 0x00098255, 0x000fea0b },
        { 48, 0x00002c0c, 0x000009aa, 0x00098255, 0x000fea13 },
        { 52, 0x00002c0c, 0x000009ae, 0x00098255, 0x000fea1b },
        { 56, 0x00002c0c, 0x000009b2, 0x00098255, 0x000fea23 },
        { 60, 0x00002c0c, 0x000009ba, 0x00098255, 0x000fea03 },
        { 64, 0x00002c0c, 0x000009be, 0x00098255, 0x000fea0b },

        /* 802.11 HyperLan 2 */
        { 100, 0x00002c0c, 0x00000a2a, 0x000b8255, 0x000fea03 },
        { 104, 0x00002c0c, 0x00000a2e, 0x000b8255, 0x000fea0b },
        { 108, 0x00002c0c, 0x00000a32, 0x000b8255, 0x000fea13 },
        { 112, 0x00002c0c, 0x00000a36, 0x000b8255, 0x000fea1b },
        { 116, 0x00002c0c, 0x00000a3a, 0x000b8255, 0x000fea23 },
        { 120, 0x00002c0c, 0x00000a82, 0x000b8255, 0x000fea03 },
        { 124, 0x00002c0c, 0x00000a86, 0x000b8255, 0x000fea0b },
        { 128, 0x00002c0c, 0x00000a8a, 0x000b8255, 0x000fea13 },
        { 132, 0x00002c0c, 0x00000a8e, 0x000b8255, 0x000fea1b },
        { 136, 0x00002c0c, 0x00000a92, 0x000b8255, 0x000fea23 },

        /* 802.11 UNII */
        { 140, 0x00002c0c, 0x00000a9a, 0x000b8255, 0x000fea03 },
        { 149, 0x00002c0c, 0x00000aa2, 0x000b8255, 0x000fea1f },
        { 153, 0x00002c0c, 0x00000aa6, 0x000b8255, 0x000fea27 },
        { 157, 0x00002c0c, 0x00000aae, 0x000b8255, 0x000fea07 },
        { 161, 0x00002c0c, 0x00000ab2, 0x000b8255, 0x000fea0f },
        { 165, 0x00002c0c, 0x00000ab6, 0x000b8255, 0x000fea17 },

        /* MMAC(Japan)J52 ch 34,38,42,46 */
        { 34, 0x00002c0c, 0x0008099a, 0x000da255, 0x000d3a0b },
        { 38, 0x00002c0c, 0x0008099e, 0x000da255, 0x000d3a13 },
        { 42, 0x00002c0c, 0x000809a2, 0x000da255, 0x000d3a1b },
        { 46, 0x00002c0c, 0x000809a6, 0x000da255, 0x000d3a23 },
};

/*
 * RF value list for RF5225 & RF2527
 * Supports: 2.4 GHz & 5.2 GHz
 */
static const struct rf_channel rf_vals_5225_2527[] = {
        { 1,  0x00002ccc, 0x00004786, 0x00068455, 0x000ffa0b },
        { 2,  0x00002ccc, 0x00004786, 0x00068455, 0x000ffa1f },
        { 3,  0x00002ccc, 0x0000478a, 0x00068455, 0x000ffa0b },
        { 4,  0x00002ccc, 0x0000478a, 0x00068455, 0x000ffa1f },
        { 5,  0x00002ccc, 0x0000478e, 0x00068455, 0x000ffa0b },
        { 6,  0x00002ccc, 0x0000478e, 0x00068455, 0x000ffa1f },
        { 7,  0x00002ccc, 0x00004792, 0x00068455, 0x000ffa0b },
        { 8,  0x00002ccc, 0x00004792, 0x00068455, 0x000ffa1f },
        { 9,  0x00002ccc, 0x00004796, 0x00068455, 0x000ffa0b },
        { 10, 0x00002ccc, 0x00004796, 0x00068455, 0x000ffa1f },
        { 11, 0x00002ccc, 0x0000479a, 0x00068455, 0x000ffa0b },
        { 12, 0x00002ccc, 0x0000479a, 0x00068455, 0x000ffa1f },
        { 13, 0x00002ccc, 0x0000479e, 0x00068455, 0x000ffa0b },
        { 14, 0x00002ccc, 0x000047a2, 0x00068455, 0x000ffa13 },

        /* 802.11 UNI / HyperLan 2 */
        { 36, 0x00002ccc, 0x0000499a, 0x0009be55, 0x000ffa23 },
        { 40, 0x00002ccc, 0x000049a2, 0x0009be55, 0x000ffa03 },
        { 44, 0x00002ccc, 0x000049a6, 0x0009be55, 0x000ffa0b },
        { 48, 0x00002ccc, 0x000049aa, 0x0009be55, 0x000ffa13 },
        { 52, 0x00002ccc, 0x000049ae, 0x0009ae55, 0x000ffa1b },
        { 56, 0x00002ccc, 0x000049b2, 0x0009ae55, 0x000ffa23 },
        { 60, 0x00002ccc, 0x000049ba, 0x0009ae55, 0x000ffa03 },
        { 64, 0x00002ccc, 0x000049be, 0x0009ae55, 0x000ffa0b },

        /* 802.11 HyperLan 2 */
        { 100, 0x00002ccc, 0x00004a2a, 0x000bae55, 0x000ffa03 },
        { 104, 0x00002ccc, 0x00004a2e, 0x000bae55, 0x000ffa0b },
        { 108, 0x00002ccc, 0x00004a32, 0x000bae55, 0x000ffa13 },
        { 112, 0x00002ccc, 0x00004a36, 0x000bae55, 0x000ffa1b },
        { 116, 0x00002ccc, 0x00004a3a, 0x000bbe55, 0x000ffa23 },
        { 120, 0x00002ccc, 0x00004a82, 0x000bbe55, 0x000ffa03 },
        { 124, 0x00002ccc, 0x00004a86, 0x000bbe55, 0x000ffa0b },
        { 128, 0x00002ccc, 0x00004a8a, 0x000bbe55, 0x000ffa13 },
        { 132, 0x00002ccc, 0x00004a8e, 0x000bbe55, 0x000ffa1b },
        { 136, 0x00002ccc, 0x00004a92, 0x000bbe55, 0x000ffa23 },

        /* 802.11 UNII */
        { 140, 0x00002ccc, 0x00004a9a, 0x000bbe55, 0x000ffa03 },
        { 149, 0x00002ccc, 0x00004aa2, 0x000bbe55, 0x000ffa1f },
        { 153, 0x00002ccc, 0x00004aa6, 0x000bbe55, 0x000ffa27 },
        { 157, 0x00002ccc, 0x00004aae, 0x000bbe55, 0x000ffa07 },
        { 161, 0x00002ccc, 0x00004ab2, 0x000bbe55, 0x000ffa0f },
        { 165, 0x00002ccc, 0x00004ab6, 0x000bbe55, 0x000ffa17 },

        /* MMAC(Japan)J52 ch 34,38,42,46 */
        { 34, 0x00002ccc, 0x0000499a, 0x0009be55, 0x000ffa0b },
        { 38, 0x00002ccc, 0x0000499e, 0x0009be55, 0x000ffa13 },
        { 42, 0x00002ccc, 0x000049a2, 0x0009be55, 0x000ffa1b },
        { 46, 0x00002ccc, 0x000049a6, 0x0009be55, 0x000ffa23 },
};


static int rt73usb_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
{
        struct hw_mode_spec *spec = &rt2x00dev->spec;
        struct channel_info *info;
        char *tx_power;
        unsigned int i;

        /*
         * Initialize all hw fields.
         *
         * Don't set IEEE80211_HOST_BROADCAST_PS_BUFFERING unless we are
         * capable of sending the buffered frames out after the DTIM
         * transmission using rt2x00lib_beacondone. This will send out
         * multicast and broadcast traffic immediately instead of buffering it
         * infinitly and thus dropping it after some time.
         */
        ieee80211_hw_set(rt2x00dev->hw, PS_NULLFUNC_STACK);
        ieee80211_hw_set(rt2x00dev->hw, SIGNAL_DBM);
        ieee80211_hw_set(rt2x00dev->hw, SUPPORTS_PS);

        SET_IEEE80211_DEV(rt2x00dev->hw, rt2x00dev->dev);
        SET_IEEE80211_PERM_ADDR(rt2x00dev->hw,
                                rt2x00_eeprom_addr(rt2x00dev,
                                                   EEPROM_MAC_ADDR_0));

        /*
         * Initialize hw_mode information.
         */
        spec->supported_bands = SUPPORT_BAND_2GHZ;
        spec->supported_rates = SUPPORT_RATE_CCK | SUPPORT_RATE_OFDM;

        if (rt2x00_rf(rt2x00dev, RF2528)) {
                spec->num_channels = ARRAY_SIZE(rf_vals_bg_2528);
                spec->channels = rf_vals_bg_2528;
        } else if (rt2x00_rf(rt2x00dev, RF5226)) {
                spec->supported_bands |= SUPPORT_BAND_5GHZ;
                spec->num_channels = ARRAY_SIZE(rf_vals_5226);
                spec->channels = rf_vals_5226;
        } else if (rt2x00_rf(rt2x00dev, RF2527)) {
                spec->num_channels = 14;
                spec->channels = rf_vals_5225_2527;
        } else if (rt2x00_rf(rt2x00dev, RF5225)) {
                spec->supported_bands |= SUPPORT_BAND_5GHZ;
                spec->num_channels = ARRAY_SIZE(rf_vals_5225_2527);
                spec->channels = rf_vals_5225_2527;
        }

        /*
         * Create channel information array
         */
        info = kcalloc(spec->num_channels, sizeof(*info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        spec->channels_info = info;

        tx_power = rt2x00_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_G_START);
        for (i = 0; i < 14; i++) {
                info[i].max_power = MAX_TXPOWER;
                info[i].default_power1 = TXPOWER_FROM_DEV(tx_power[i]);
        }

        if (spec->num_channels > 14) {
                tx_power = rt2x00_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_A_START);
                for (i = 14; i < spec->num_channels; i++) {
                        info[i].max_power = MAX_TXPOWER;
                        info[i].default_power1 =
                                        TXPOWER_FROM_DEV(tx_power[i - 14]);
                }
        }

        return 0;
}

static int rt73usb_probe_hw(struct rt2x00_dev *rt2x00dev)
{
        int retval;
        u32 reg;

        /*
         * Allocate eeprom data.
         */
        retval = rt73usb_validate_eeprom(rt2x00dev);
        if (retval)
                return retval;

        retval = rt73usb_init_eeprom(rt2x00dev);
        if (retval)
                return retval;

        /*
         * Enable rfkill polling by setting GPIO direction of the
         * rfkill switch GPIO pin correctly.
         */
        rt2x00usb_register_read(rt2x00dev, MAC_CSR13, &reg);
        rt2x00_set_field32(&reg, MAC_CSR13_DIR7, 0);
        rt2x00usb_register_write(rt2x00dev, MAC_CSR13, reg);

        /*
         * Initialize hw specifications.
         */
        retval = rt73usb_probe_hw_mode(rt2x00dev);
        if (retval)
                return retval;

        /*
         * This device has multiple filters for control frames,
         * but has no a separate filter for PS Poll frames.
         */
        __set_bit(CAPABILITY_CONTROL_FILTERS, &rt2x00dev->cap_flags);

        /*
         * This device requires firmware.
         */
        __set_bit(REQUIRE_FIRMWARE, &rt2x00dev->cap_flags);
        if (!modparam_nohwcrypt)
                __set_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags);
        __set_bit(CAPABILITY_LINK_TUNING, &rt2x00dev->cap_flags);
        __set_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags);

        /*
         * Set the rssi offset.
         */
        rt2x00dev->rssi_offset = DEFAULT_RSSI_OFFSET;

        return 0;
}

/*
 * IEEE80211 stack callback functions.
 */
static int rt73usb_conf_tx(struct ieee80211_hw *hw,
                           struct ieee80211_vif *vif, u16 queue_idx,
                           const struct ieee80211_tx_queue_params *params)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        struct data_queue *queue;
        struct rt2x00_field32 field;
        int retval;
        u32 reg;
        u32 offset;

        /*
         * First pass the configuration through rt2x00lib, that will
         * update the queue settings and validate the input. After that
         * we are free to update the registers based on the value
         * in the queue parameter.
         */
        retval = rt2x00mac_conf_tx(hw, vif, queue_idx, params);
        if (retval)
                return retval;

        /*
         * We only need to perform additional register initialization
         * for WMM queues/
         */
        if (queue_idx >= 4)
                return 0;

        queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);

        /* Update WMM TXOP register */
        offset = AC_TXOP_CSR0 + (sizeof(u32) * (!!(queue_idx & 2)));
        field.bit_offset = (queue_idx & 1) * 16;
        field.bit_mask = 0xffff << field.bit_offset;

        rt2x00usb_register_read(rt2x00dev, offset, &reg);
        rt2x00_set_field32(&reg, field, queue->txop);
        rt2x00usb_register_write(rt2x00dev, offset, reg);

        /* Update WMM registers */
        field.bit_offset = queue_idx * 4;
        field.bit_mask = 0xf << field.bit_offset;

        rt2x00usb_register_read(rt2x00dev, AIFSN_CSR, &reg);
        rt2x00_set_field32(&reg, field, queue->aifs);
        rt2x00usb_register_write(rt2x00dev, AIFSN_CSR, reg);

        rt2x00usb_register_read(rt2x00dev, CWMIN_CSR, &reg);
        rt2x00_set_field32(&reg, field, queue->cw_min);
        rt2x00usb_register_write(rt2x00dev, CWMIN_CSR, reg);

        rt2x00usb_register_read(rt2x00dev, CWMAX_CSR, &reg);
        rt2x00_set_field32(&reg, field, queue->cw_max);
        rt2x00usb_register_write(rt2x00dev, CWMAX_CSR, reg);

        return 0;
}

static u64 rt73usb_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        u64 tsf;
        u32 reg;

        rt2x00usb_register_read(rt2x00dev, TXRX_CSR13, &reg);
        tsf = (u64) rt2x00_get_field32(reg, TXRX_CSR13_HIGH_TSFTIMER) << 32;
        rt2x00usb_register_read(rt2x00dev, TXRX_CSR12, &reg);
        tsf |= rt2x00_get_field32(reg, TXRX_CSR12_LOW_TSFTIMER);

        return tsf;
}

static const struct ieee80211_ops rt73usb_mac80211_ops = {
        .tx                     = rt2x00mac_tx,
        .start                  = rt2x00mac_start,
        .stop                   = rt2x00mac_stop,
        .add_interface          = rt2x00mac_add_interface,
        .remove_interface       = rt2x00mac_remove_interface,
        .config                 = rt2x00mac_config,
        .configure_filter       = rt2x00mac_configure_filter,
        .set_tim                = rt2x00mac_set_tim,
        .set_key                = rt2x00mac_set_key,
        .sw_scan_start          = rt2x00mac_sw_scan_start,
        .sw_scan_complete       = rt2x00mac_sw_scan_complete,
        .get_stats              = rt2x00mac_get_stats,
        .bss_info_changed       = rt2x00mac_bss_info_changed,
        .conf_tx                = rt73usb_conf_tx,
        .get_tsf                = rt73usb_get_tsf,
        .rfkill_poll            = rt2x00mac_rfkill_poll,
        .flush                  = rt2x00mac_flush,
        .set_antenna            = rt2x00mac_set_antenna,
        .get_antenna            = rt2x00mac_get_antenna,
        .get_ringparam          = rt2x00mac_get_ringparam,
        .tx_frames_pending      = rt2x00mac_tx_frames_pending,
};

static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
        .probe_hw               = rt73usb_probe_hw,
        .get_firmware_name      = rt73usb_get_firmware_name,
        .check_firmware         = rt73usb_check_firmware,
        .load_firmware          = rt73usb_load_firmware,
        .initialize             = rt2x00usb_initialize,
        .uninitialize           = rt2x00usb_uninitialize,
        .clear_entry            = rt2x00usb_clear_entry,
        .set_device_state       = rt73usb_set_device_state,
        .rfkill_poll            = rt73usb_rfkill_poll,
        .link_stats             = rt73usb_link_stats,
        .reset_tuner            = rt73usb_reset_tuner,
        .link_tuner             = rt73usb_link_tuner,
        .watchdog               = rt2x00usb_watchdog,
        .start_queue            = rt73usb_start_queue,
        .kick_queue             = rt2x00usb_kick_queue,
        .stop_queue             = rt73usb_stop_queue,
        .flush_queue            = rt2x00usb_flush_queue,
        .write_tx_desc          = rt73usb_write_tx_desc,
        .write_beacon           = rt73usb_write_beacon,
        .clear_beacon           = rt73usb_clear_beacon,
        .get_tx_data_len        = rt73usb_get_tx_data_len,
        .fill_rxdone            = rt73usb_fill_rxdone,
        .config_shared_key      = rt73usb_config_shared_key,
        .config_pairwise_key    = rt73usb_config_pairwise_key,
        .config_filter          = rt73usb_config_filter,
        .config_intf            = rt73usb_config_intf,
        .config_erp             = rt73usb_config_erp,
        .config_ant             = rt73usb_config_ant,
        .config                 = rt73usb_config,
};

static void rt73usb_queue_init(struct data_queue *queue)
{
        switch (queue->qid) {
        case QID_RX:
                queue->limit = 32;
                queue->data_size = DATA_FRAME_SIZE;
                queue->desc_size = RXD_DESC_SIZE;
                queue->priv_size = sizeof(struct queue_entry_priv_usb);
                break;

        case QID_AC_VO:
        case QID_AC_VI:
        case QID_AC_BE:
        case QID_AC_BK:
                queue->limit = 32;
                queue->data_size = DATA_FRAME_SIZE;
                queue->desc_size = TXD_DESC_SIZE;
                queue->priv_size = sizeof(struct queue_entry_priv_usb);
                break;

        case QID_BEACON:
                queue->limit = 4;
                queue->data_size = MGMT_FRAME_SIZE;
                queue->desc_size = TXINFO_SIZE;
                queue->priv_size = sizeof(struct queue_entry_priv_usb);
                break;

        case QID_ATIM:
                /* fallthrough */
        default:
                BUG();
                break;
        }
}

static const struct rt2x00_ops rt73usb_ops = {
        .name                   = KBUILD_MODNAME,
        .max_ap_intf            = 4,
        .eeprom_size            = EEPROM_SIZE,
        .rf_size                = RF_SIZE,
        .tx_queues              = NUM_TX_QUEUES,
        .queue_init             = rt73usb_queue_init,
        .lib                    = &rt73usb_rt2x00_ops,
        .hw                     = &rt73usb_mac80211_ops,
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
        .debugfs                = &rt73usb_rt2x00debug,
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
};

/*
 * rt73usb module information.
 */
static struct usb_device_id rt73usb_device_table[] = {
        /* AboCom */
        { USB_DEVICE(0x07b8, 0xb21b) },
        { USB_DEVICE(0x07b8, 0xb21c) },
        { USB_DEVICE(0x07b8, 0xb21d) },
        { USB_DEVICE(0x07b8, 0xb21e) },
        { USB_DEVICE(0x07b8, 0xb21f) },
        /* AL */
        { USB_DEVICE(0x14b2, 0x3c10) },
        /* Amigo */
        { USB_DEVICE(0x148f, 0x9021) },
        { USB_DEVICE(0x0eb0, 0x9021) },
        /* AMIT  */
        { USB_DEVICE(0x18c5, 0x0002) },
        /* Askey */
        { USB_DEVICE(0x1690, 0x0722) },
        /* ASUS */
        { USB_DEVICE(0x0b05, 0x1723) },
        { USB_DEVICE(0x0b05, 0x1724) },
        /* Belkin */
        { USB_DEVICE(0x050d, 0x7050) }, /* FCC ID: K7SF5D7050B ver. 3.x */
        { USB_DEVICE(0x050d, 0x705a) },
        { USB_DEVICE(0x050d, 0x905b) },
        { USB_DEVICE(0x050d, 0x905c) },
        /* Billionton */
        { USB_DEVICE(0x1631, 0xc019) },
        { USB_DEVICE(0x08dd, 0x0120) },
        /* Buffalo */
        { USB_DEVICE(0x0411, 0x00d8) },
        { USB_DEVICE(0x0411, 0x00d9) },
        { USB_DEVICE(0x0411, 0x00e6) },
        { USB_DEVICE(0x0411, 0x00f4) },
        { USB_DEVICE(0x0411, 0x0116) },
        { USB_DEVICE(0x0411, 0x0119) },
        { USB_DEVICE(0x0411, 0x0137) },
        /* CEIVA */
        { USB_DEVICE(0x178d, 0x02be) },
        /* CNet */
        { USB_DEVICE(0x1371, 0x9022) },
        { USB_DEVICE(0x1371, 0x9032) },
        /* Conceptronic */
        { USB_DEVICE(0x14b2, 0x3c22) },
        /* Corega */
        { USB_DEVICE(0x07aa, 0x002e) },
        /* D-Link */
        { USB_DEVICE(0x07d1, 0x3c03) },
        { USB_DEVICE(0x07d1, 0x3c04) },
        { USB_DEVICE(0x07d1, 0x3c06) },
        { USB_DEVICE(0x07d1, 0x3c07) },
        /* Edimax */
        { USB_DEVICE(0x7392, 0x7318) },
        { USB_DEVICE(0x7392, 0x7618) },
        /* EnGenius */
        { USB_DEVICE(0x1740, 0x3701) },
        /* Gemtek */
        { USB_DEVICE(0x15a9, 0x0004) },
        /* Gigabyte */
        { USB_DEVICE(0x1044, 0x8008) },
        { USB_DEVICE(0x1044, 0x800a) },
        /* Huawei-3Com */
        { USB_DEVICE(0x1472, 0x0009) },
        /* Hercules */
        { USB_DEVICE(0x06f8, 0xe002) },
        { USB_DEVICE(0x06f8, 0xe010) },
        { USB_DEVICE(0x06f8, 0xe020) },
        /* Linksys */
        { USB_DEVICE(0x13b1, 0x0020) },
        { USB_DEVICE(0x13b1, 0x0023) },
        { USB_DEVICE(0x13b1, 0x0028) },
        /* MSI */
        { USB_DEVICE(0x0db0, 0x4600) },
        { USB_DEVICE(0x0db0, 0x6877) },
        { USB_DEVICE(0x0db0, 0x6874) },
        { USB_DEVICE(0x0db0, 0xa861) },
        { USB_DEVICE(0x0db0, 0xa874) },
        /* Ovislink */
        { USB_DEVICE(0x1b75, 0x7318) },
        /* Ralink */
        { USB_DEVICE(0x04bb, 0x093d) },
        { USB_DEVICE(0x148f, 0x2573) },
        { USB_DEVICE(0x148f, 0x2671) },
        { USB_DEVICE(0x0812, 0x3101) },
        /* Qcom */
        { USB_DEVICE(0x18e8, 0x6196) },
        { USB_DEVICE(0x18e8, 0x6229) },
        { USB_DEVICE(0x18e8, 0x6238) },
        /* Samsung */
        { USB_DEVICE(0x04e8, 0x4471) },
        /* Senao */
        { USB_DEVICE(0x1740, 0x7100) },
        /* Sitecom */
        { USB_DEVICE(0x0df6, 0x0024) },
        { USB_DEVICE(0x0df6, 0x0027) },
        { USB_DEVICE(0x0df6, 0x002f) },
        { USB_DEVICE(0x0df6, 0x90ac) },
        { USB_DEVICE(0x0df6, 0x9712) },
        /* Surecom */
        { USB_DEVICE(0x0769, 0x31f3) },
        /* Tilgin */
        { USB_DEVICE(0x6933, 0x5001) },
        /* Philips */
        { USB_DEVICE(0x0471, 0x200a) },
        /* Planex */
        { USB_DEVICE(0x2019, 0xab01) },
        { USB_DEVICE(0x2019, 0xab50) },
        /* WideTell */
        { USB_DEVICE(0x7167, 0x3840) },
        /* Zcom */
        { USB_DEVICE(0x0cde, 0x001c) },
        /* ZyXEL */
        { USB_DEVICE(0x0586, 0x3415) },
        { 0, }
};

MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("Ralink RT73 USB Wireless LAN driver.");
MODULE_SUPPORTED_DEVICE("Ralink RT2571W & RT2671 USB chipset based cards");
MODULE_DEVICE_TABLE(usb, rt73usb_device_table);
MODULE_FIRMWARE(FIRMWARE_RT2571);
MODULE_LICENSE("GPL");

static int rt73usb_probe(struct usb_interface *usb_intf,
                         const struct usb_device_id *id)
{
        return rt2x00usb_probe(usb_intf, &rt73usb_ops);
}

static struct usb_driver rt73usb_driver = {
        .name           = KBUILD_MODNAME,
        .id_table       = rt73usb_device_table,
        .probe          = rt73usb_probe,
        .disconnect     = rt2x00usb_disconnect,
        .suspend        = rt2x00usb_suspend,
        .resume         = rt2x00usb_resume,
        .reset_resume   = rt2x00usb_resume,
        .disable_hub_initiated_lpm = 1,
};

module_usb_driver(rt73usb_driver);