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rt2500usb.c

/*
      Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
      <http://rt2x00.serialmonkey.com>

      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the
      Free Software Foundation, Inc.,
      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
      Module: rt2500usb
      Abstract: rt2500usb device specific routines.
      Supported chipsets: RT2570.
 */

/*
 * Set enviroment defines for rt2x00.h
 */
#define DRV_NAME "rt2500usb"

#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "rt2x00.h"
#include "rt2x00usb.h"
#include "rt2500usb.h"

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt2500usb_register_read and rt2500usb_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.
 */
static inline void rt2500usb_register_read(const struct rt2x00_dev *rt2x00dev,
                                 const unsigned int offset,
                                 u16 *value)
{
      __le16 reg;
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
                              USB_VENDOR_REQUEST_IN, offset,
                              &reg, sizeof(u16), REGISTER_TIMEOUT);
      *value = le16_to_cpu(reg);
}

static inline void rt2500usb_register_multiread(const struct rt2x00_dev
                                    *rt2x00dev,
                                    const unsigned int offset,
                                    void *value, const u16 length)
{
      int timeout = REGISTER_TIMEOUT * (length / sizeof(u16));
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
                              USB_VENDOR_REQUEST_IN, offset,
                              value, length, timeout);
}

static inline void rt2500usb_register_write(const struct rt2x00_dev *rt2x00dev,
                                  const unsigned int offset,
                                  u16 value)
{
      __le16 reg = cpu_to_le16(value);
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
                              USB_VENDOR_REQUEST_OUT, offset,
                              &reg, sizeof(u16), REGISTER_TIMEOUT);
}

static inline void rt2500usb_register_multiwrite(const struct rt2x00_dev
                                     *rt2x00dev,
                                     const unsigned int offset,
                                     void *value, const u16 length)
{
      int timeout = REGISTER_TIMEOUT * (length / sizeof(u16));
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
                              USB_VENDOR_REQUEST_OUT, offset,
                              value, length, timeout);
}

static u16 rt2500usb_bbp_check(const struct rt2x00_dev *rt2x00dev)
{
      u16 reg;
      unsigned int i;

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt2500usb_register_read(rt2x00dev, PHY_CSR8, &reg);
            if (!rt2x00_get_field16(reg, PHY_CSR8_BUSY))
                  break;
            udelay(REGISTER_BUSY_DELAY);
      }

      return reg;
}

static void rt2500usb_bbp_write(const struct rt2x00_dev *rt2x00dev,
                        const unsigned int word, const u8 value)
{
      u16 reg;

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt2500usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field16(reg, PHY_CSR8_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR8 register busy. Write failed.\n");
            return;
      }

      /*
       * Write the data into the BBP.
       */
      reg = 0;
      rt2x00_set_field16(&reg, PHY_CSR7_DATA, value);
      rt2x00_set_field16(&reg, PHY_CSR7_REG_ID, word);
      rt2x00_set_field16(&reg, PHY_CSR7_READ_CONTROL, 0);

      rt2500usb_register_write(rt2x00dev, PHY_CSR7, reg);
}

static void rt2500usb_bbp_read(const struct rt2x00_dev *rt2x00dev,
                         const unsigned int word, u8 *value)
{
      u16 reg;

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt2500usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field16(reg, PHY_CSR8_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR8 register busy. Read failed.\n");
            return;
      }

      /*
       * Write the request into the BBP.
       */
      reg = 0;
      rt2x00_set_field16(&reg, PHY_CSR7_REG_ID, word);
      rt2x00_set_field16(&reg, PHY_CSR7_READ_CONTROL, 1);

      rt2500usb_register_write(rt2x00dev, PHY_CSR7, reg);

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt2500usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field16(reg, PHY_CSR8_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR8 register busy. Read failed.\n");
            *value = 0xff;
            return;
      }

      rt2500usb_register_read(rt2x00dev, PHY_CSR7, &reg);
      *value = rt2x00_get_field16(reg, PHY_CSR7_DATA);
}

static void rt2500usb_rf_write(const struct rt2x00_dev *rt2x00dev,
                         const unsigned int word, const u32 value)
{
      u16 reg;
      unsigned int i;

      if (!word)
            return;

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt2500usb_register_read(rt2x00dev, PHY_CSR10, &reg);
            if (!rt2x00_get_field16(reg, PHY_CSR10_RF_BUSY))
                  goto rf_write;
            udelay(REGISTER_BUSY_DELAY);
      }

      ERROR(rt2x00dev, "PHY_CSR10 register busy. Write failed.\n");
      return;

rf_write:
      reg = 0;
      rt2x00_set_field16(&reg, PHY_CSR9_RF_VALUE, value);
      rt2500usb_register_write(rt2x00dev, PHY_CSR9, reg);

      reg = 0;
      rt2x00_set_field16(&reg, PHY_CSR10_RF_VALUE, value >> 16);
      rt2x00_set_field16(&reg, PHY_CSR10_RF_NUMBER_OF_BITS, 20);
      rt2x00_set_field16(&reg, PHY_CSR10_RF_IF_SELECT, 0);
      rt2x00_set_field16(&reg, PHY_CSR10_RF_BUSY, 1);

      rt2500usb_register_write(rt2x00dev, PHY_CSR10, reg);
      rt2x00_rf_write(rt2x00dev, word, value);
}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
#define CSR_OFFSET(__word)    ( CSR_REG_BASE + ((__word) * sizeof(u16)) )

static void rt2500usb_read_csr(const struct rt2x00_dev *rt2x00dev,
                         const unsigned int word, u32 *data)
{
      rt2500usb_register_read(rt2x00dev, CSR_OFFSET(word), (u16 *) data);
}

static void rt2500usb_write_csr(const struct rt2x00_dev *rt2x00dev,
                        const unsigned int word, u32 data)
{
      rt2500usb_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt2500usb_rt2x00debug = {
      .owner      = THIS_MODULE,
      .csr  = {
            .read       = rt2500usb_read_csr,
            .write            = rt2500usb_write_csr,
            .word_size  = sizeof(u16),
            .word_count = CSR_REG_SIZE / sizeof(u16),
      },
      .eeprom     = {
            .read       = rt2x00_eeprom_read,
            .write            = rt2x00_eeprom_write,
            .word_size  = sizeof(u16),
            .word_count = EEPROM_SIZE / sizeof(u16),
      },
      .bbp  = {
            .read       = rt2500usb_bbp_read,
            .write            = rt2500usb_bbp_write,
            .word_size  = sizeof(u8),
            .word_count = BBP_SIZE / sizeof(u8),
      },
      .rf   = {
            .read       = rt2x00_rf_read,
            .write            = rt2500usb_rf_write,
            .word_size  = sizeof(u32),
            .word_count = RF_SIZE / sizeof(u32),
      },
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

/*
 * Configuration handlers.
 */
static void rt2500usb_config_mac_addr(struct rt2x00_dev *rt2x00dev,
                              __le32 *mac)
{
      rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
                              (3 * sizeof(__le16)));
}

static void rt2500usb_config_bssid(struct rt2x00_dev *rt2x00dev,
                           __le32 *bssid)
{
      rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, bssid,
                              (3 * sizeof(__le16)));
}

static void rt2500usb_config_type(struct rt2x00_dev *rt2x00dev, const int type,
                          const int tsf_sync)
{
      u16 reg;

      rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);

      /*
       * Enable beacon config
       */
      rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET,
                     (PREAMBLE + get_duration(IEEE80211_HEADER, 20)) >> 6);
      if (type == IEEE80211_IF_TYPE_STA)
            rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW, 0);
      else
            rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW, 2);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR20, reg);

      /*
       * Enable synchronisation.
       */
      rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR18_OFFSET, 0);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
      rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 1);
      rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
      rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, tsf_sync);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
}

static void rt2500usb_config_preamble(struct rt2x00_dev *rt2x00dev,
                              const int short_preamble,
                              const int ack_timeout,
                              const int ack_consume_time)
{
      u16 reg;

      /*
       * When in atomic context, reschedule and let rt2x00lib
       * call this function again.
       */
      if (in_atomic()) {
            queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->config_work);
            return;
      }

      rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, ack_timeout);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR10, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR10_AUTORESPOND_PREAMBLE,
                     !!short_preamble);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR10, reg);
}

static void rt2500usb_config_phymode(struct rt2x00_dev *rt2x00dev,
                             const int phymode,
                             const int basic_rate_mask)
{
      rt2500usb_register_write(rt2x00dev, TXRX_CSR11, basic_rate_mask);

      if (phymode == HWMODE_B) {
            rt2500usb_register_write(rt2x00dev, MAC_CSR11, 0x000b);
            rt2500usb_register_write(rt2x00dev, MAC_CSR12, 0x0040);
      } else {
            rt2500usb_register_write(rt2x00dev, MAC_CSR11, 0x0005);
            rt2500usb_register_write(rt2x00dev, MAC_CSR12, 0x016c);
      }
}

static void rt2500usb_config_channel(struct rt2x00_dev *rt2x00dev,
                             struct rf_channel *rf, const int txpower)
{
      /*
       * Set TXpower.
       */
      rt2x00_set_field32(&rf->rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));

      /*
       * For RT2525E we should first set the channel to half band higher.
       */
      if (rt2x00_rf(&rt2x00dev->chip, RF2525E)) {
            static const u32 vals[] = {
                  0x000008aa, 0x000008ae, 0x000008ae, 0x000008b2,
                  0x000008b2, 0x000008b6, 0x000008b6, 0x000008ba,
                  0x000008ba, 0x000008be, 0x000008b7, 0x00000902,
                  0x00000902, 0x00000906
            };

            rt2500usb_rf_write(rt2x00dev, 2, vals[rf->channel - 1]);
            if (rf->rf4)
                  rt2500usb_rf_write(rt2x00dev, 4, rf->rf4);
      }

      rt2500usb_rf_write(rt2x00dev, 1, rf->rf1);
      rt2500usb_rf_write(rt2x00dev, 2, rf->rf2);
      rt2500usb_rf_write(rt2x00dev, 3, rf->rf3);
      if (rf->rf4)
            rt2500usb_rf_write(rt2x00dev, 4, rf->rf4);
}

static void rt2500usb_config_txpower(struct rt2x00_dev *rt2x00dev,
                             const int txpower)
{
      u32 rf3;

      rt2x00_rf_read(rt2x00dev, 3, &rf3);
      rt2x00_set_field32(&rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
      rt2500usb_rf_write(rt2x00dev, 3, rf3);
}

static void rt2500usb_config_antenna(struct rt2x00_dev *rt2x00dev,
                             const int antenna_tx, const int antenna_rx)
{
      u8 r2;
      u8 r14;
      u16 csr5;
      u16 csr6;

      rt2500usb_bbp_read(rt2x00dev, 2, &r2);
      rt2500usb_bbp_read(rt2x00dev, 14, &r14);
      rt2500usb_register_read(rt2x00dev, PHY_CSR5, &csr5);
      rt2500usb_register_read(rt2x00dev, PHY_CSR6, &csr6);

      /*
       * Configure the TX antenna.
       */
      switch (antenna_tx) {
      case ANTENNA_SW_DIVERSITY:
      case ANTENNA_HW_DIVERSITY:
            rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 1);
            rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 1);
            rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 1);
            break;
      case ANTENNA_A:
            rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 0);
            rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 0);
            rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 0);
            break;
      case ANTENNA_B:
            rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 2);
            rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 2);
            rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 2);
            break;
      }

      /*
       * Configure the RX antenna.
       */
      switch (antenna_rx) {
      case ANTENNA_SW_DIVERSITY:
      case ANTENNA_HW_DIVERSITY:
            rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 1);
            break;
      case ANTENNA_A:
            rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 0);
            break;
      case ANTENNA_B:
            rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 2);
            break;
      }

      /*
       * RT2525E and RT5222 need to flip TX I/Q
       */
      if (rt2x00_rf(&rt2x00dev->chip, RF2525E) ||
          rt2x00_rf(&rt2x00dev->chip, RF5222)) {
            rt2x00_set_field8(&r2, BBP_R2_TX_IQ_FLIP, 1);
            rt2x00_set_field16(&csr5, PHY_CSR5_CCK_FLIP, 1);
            rt2x00_set_field16(&csr6, PHY_CSR6_OFDM_FLIP, 1);

            /*
             * RT2525E does not need RX I/Q Flip.
             */
            if (rt2x00_rf(&rt2x00dev->chip, RF2525E))
                  rt2x00_set_field8(&r14, BBP_R14_RX_IQ_FLIP, 0);
      } else {
            rt2x00_set_field16(&csr5, PHY_CSR5_CCK_FLIP, 0);
            rt2x00_set_field16(&csr6, PHY_CSR6_OFDM_FLIP, 0);
      }

      rt2500usb_bbp_write(rt2x00dev, 2, r2);
      rt2500usb_bbp_write(rt2x00dev, 14, r14);
      rt2500usb_register_write(rt2x00dev, PHY_CSR5, csr5);
      rt2500usb_register_write(rt2x00dev, PHY_CSR6, csr6);
}

static void rt2500usb_config_duration(struct rt2x00_dev *rt2x00dev,
                              struct rt2x00lib_conf *libconf)
{
      u16 reg;

      rt2500usb_register_write(rt2x00dev, MAC_CSR10, libconf->slot_time);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR18_INTERVAL,
                     libconf->conf->beacon_int * 4);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);
}

static void rt2500usb_config(struct rt2x00_dev *rt2x00dev,
                       const unsigned int flags,
                       struct rt2x00lib_conf *libconf)
{
      if (flags & CONFIG_UPDATE_PHYMODE)
            rt2500usb_config_phymode(rt2x00dev, libconf->phymode,
                               libconf->basic_rates);
      if (flags & CONFIG_UPDATE_CHANNEL)
            rt2500usb_config_channel(rt2x00dev, &libconf->rf,
                               libconf->conf->power_level);
      if ((flags & CONFIG_UPDATE_TXPOWER) && !(flags & CONFIG_UPDATE_CHANNEL))
            rt2500usb_config_txpower(rt2x00dev,
                               libconf->conf->power_level);
      if (flags & CONFIG_UPDATE_ANTENNA)
            rt2500usb_config_antenna(rt2x00dev,
                               libconf->conf->antenna_sel_tx,
                               libconf->conf->antenna_sel_rx);
      if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
            rt2500usb_config_duration(rt2x00dev, libconf);
}

/*
 * LED functions.
 */
static void rt2500usb_enable_led(struct rt2x00_dev *rt2x00dev)
{
      u16 reg;

      rt2500usb_register_read(rt2x00dev, MAC_CSR21, &reg);
      rt2x00_set_field16(&reg, MAC_CSR21_ON_PERIOD, 70);
      rt2x00_set_field16(&reg, MAC_CSR21_OFF_PERIOD, 30);
      rt2500usb_register_write(rt2x00dev, MAC_CSR21, reg);

      rt2500usb_register_read(rt2x00dev, MAC_CSR20, &reg);

      if (rt2x00dev->led_mode == LED_MODE_TXRX_ACTIVITY) {
            rt2x00_set_field16(&reg, MAC_CSR20_LINK, 1);
            rt2x00_set_field16(&reg, MAC_CSR20_ACTIVITY, 0);
      } else if (rt2x00dev->led_mode == LED_MODE_ASUS) {
            rt2x00_set_field16(&reg, MAC_CSR20_LINK, 0);
            rt2x00_set_field16(&reg, MAC_CSR20_ACTIVITY, 1);
      } else {
            rt2x00_set_field16(&reg, MAC_CSR20_LINK, 1);
            rt2x00_set_field16(&reg, MAC_CSR20_ACTIVITY, 1);
      }

      rt2500usb_register_write(rt2x00dev, MAC_CSR20, reg);
}

static void rt2500usb_disable_led(struct rt2x00_dev *rt2x00dev)
{
      u16 reg;

      rt2500usb_register_read(rt2x00dev, MAC_CSR20, &reg);
      rt2x00_set_field16(&reg, MAC_CSR20_LINK, 0);
      rt2x00_set_field16(&reg, MAC_CSR20_ACTIVITY, 0);
      rt2500usb_register_write(rt2x00dev, MAC_CSR20, reg);
}

/*
 * Link tuning
 */
static void rt2500usb_link_stats(struct rt2x00_dev *rt2x00dev)
{
      u16 reg;

      /*
       * Update FCS error count from register.
       */
      rt2500usb_register_read(rt2x00dev, STA_CSR0, &reg);
      rt2x00dev->link.rx_failed = rt2x00_get_field16(reg, STA_CSR0_FCS_ERROR);

      /*
       * Update False CCA count from register.
       */
      rt2500usb_register_read(rt2x00dev, STA_CSR3, &reg);
      rt2x00dev->link.false_cca =
          rt2x00_get_field16(reg, STA_CSR3_FALSE_CCA_ERROR);
}

static void rt2500usb_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
      u16 eeprom;
      u16 value;

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &eeprom);
      value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R24_LOW);
      rt2500usb_bbp_write(rt2x00dev, 24, value);

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &eeprom);
      value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R25_LOW);
      rt2500usb_bbp_write(rt2x00dev, 25, value);

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &eeprom);
      value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R61_LOW);
      rt2500usb_bbp_write(rt2x00dev, 61, value);

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &eeprom);
      value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_VGCUPPER);
      rt2500usb_bbp_write(rt2x00dev, 17, value);

      rt2x00dev->link.vgc_level = value;
}

static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
{
      int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
      u16 bbp_thresh;
      u16 vgc_bound;
      u16 sens;
      u16 r24;
      u16 r25;
      u16 r61;
      u16 r17_sens;
      u8 r17;
      u8 up_bound;
      u8 low_bound;

      /*
       * Determine the BBP tuning threshold and correctly
       * set BBP 24, 25 and 61.
       */
      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE, &bbp_thresh);
      bbp_thresh = rt2x00_get_field16(bbp_thresh, EEPROM_BBPTUNE_THRESHOLD);

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &r24);
      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &r25);
      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &r61);

      if ((rssi + bbp_thresh) > 0) {
            r24 = rt2x00_get_field16(r24, EEPROM_BBPTUNE_R24_HIGH);
            r25 = rt2x00_get_field16(r25, EEPROM_BBPTUNE_R25_HIGH);
            r61 = rt2x00_get_field16(r61, EEPROM_BBPTUNE_R61_HIGH);
      } else {
            r24 = rt2x00_get_field16(r24, EEPROM_BBPTUNE_R24_LOW);
            r25 = rt2x00_get_field16(r25, EEPROM_BBPTUNE_R25_LOW);
            r61 = rt2x00_get_field16(r61, EEPROM_BBPTUNE_R61_LOW);
      }

      rt2500usb_bbp_write(rt2x00dev, 24, r24);
      rt2500usb_bbp_write(rt2x00dev, 25, r25);
      rt2500usb_bbp_write(rt2x00dev, 61, r61);

      /*
       * Read current r17 value, as well as the sensitivity values
       * for the r17 register.
       */
      rt2500usb_bbp_read(rt2x00dev, 17, &r17);
      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &r17_sens);

      /*
       * A too low RSSI will cause too much false CCA which will
       * then corrupt the R17 tuning. To remidy this the tuning should
       * be stopped (While making sure the R17 value will not exceed limits)
       */
      if (rssi >= -40) {
            if (r17 != 0x60)
                  rt2500usb_bbp_write(rt2x00dev, 17, 0x60);
            return;
      }

      /*
       * Special big-R17 for short distance
       */
      if (rssi >= -58) {
            sens = rt2x00_get_field16(r17_sens, EEPROM_BBPTUNE_R17_LOW);
            if (r17 != sens)
                  rt2500usb_bbp_write(rt2x00dev, 17, sens);
            return;
      }

      /*
       * Special mid-R17 for middle distance
       */
      if (rssi >= -74) {
            sens = rt2x00_get_field16(r17_sens, EEPROM_BBPTUNE_R17_HIGH);
            if (r17 != sens)
                  rt2500usb_bbp_write(rt2x00dev, 17, sens);
            return;
      }

      /*
       * Leave short or middle distance condition, restore r17
       * to the dynamic tuning range.
       */
      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &vgc_bound);
      vgc_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCUPPER);

      low_bound = 0x32;
      if (rssi >= -77)
            up_bound = vgc_bound;
      else
            up_bound = vgc_bound - (-77 - rssi);

      if (up_bound < low_bound)
            up_bound = low_bound;

      if (r17 > up_bound) {
            rt2500usb_bbp_write(rt2x00dev, 17, up_bound);
            rt2x00dev->link.vgc_level = up_bound;
      } else if (rt2x00dev->link.false_cca > 512 && r17 < up_bound) {
            rt2500usb_bbp_write(rt2x00dev, 17, ++r17);
            rt2x00dev->link.vgc_level = r17;
      } else if (rt2x00dev->link.false_cca < 100 && r17 > low_bound) {
            rt2500usb_bbp_write(rt2x00dev, 17, --r17);
            rt2x00dev->link.vgc_level = r17;
      }
}

/*
 * Initialization functions.
 */
static int rt2500usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
      u16 reg;

      rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0x0001,
                            USB_MODE_TEST, REGISTER_TIMEOUT);
      rt2x00usb_vendor_request_sw(rt2x00dev, USB_SINGLE_WRITE, 0x0308,
                            0x00f0, REGISTER_TIMEOUT);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR2_DISABLE_RX, 1);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);

      rt2500usb_register_write(rt2x00dev, MAC_CSR13, 0x1111);
      rt2500usb_register_write(rt2x00dev, MAC_CSR14, 0x1e11);

      rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 1);
      rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 1);
      rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 0);
      rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

      rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 0);
      rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 0);
      rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 0);
      rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR5, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID0, 13);
      rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID0_VALID, 1);
      rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID1, 12);
      rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID1_VALID, 1);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR5, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR6, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID0, 10);
      rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID0_VALID, 1);
      rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID1, 11);
      rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID1_VALID, 1);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR6, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR7, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID0, 7);
      rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID0_VALID, 1);
      rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID1, 6);
      rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID1_VALID, 1);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR7, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR8, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID0, 5);
      rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID0_VALID, 1);
      rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID1, 0);
      rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID1_VALID, 0);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR8, reg);

      rt2500usb_register_write(rt2x00dev, TXRX_CSR21, 0xe78f);
      rt2500usb_register_write(rt2x00dev, MAC_CSR9, 0xff1d);

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

      rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 0);
      rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 0);
      rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 1);
      rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

      if (rt2x00_rev(&rt2x00dev->chip) >= RT2570_VERSION_C) {
            rt2500usb_register_read(rt2x00dev, PHY_CSR2, &reg);
            reg &= ~0x0002;
      } else {
            reg = 0x3002;
      }
      rt2500usb_register_write(rt2x00dev, PHY_CSR2, reg);

      rt2500usb_register_write(rt2x00dev, MAC_CSR11, 0x0002);
      rt2500usb_register_write(rt2x00dev, MAC_CSR22, 0x0053);
      rt2500usb_register_write(rt2x00dev, MAC_CSR15, 0x01ee);
      rt2500usb_register_write(rt2x00dev, MAC_CSR16, 0x0000);

      rt2500usb_register_read(rt2x00dev, MAC_CSR8, &reg);
      rt2x00_set_field16(&reg, MAC_CSR8_MAX_FRAME_UNIT,
                     rt2x00dev->rx->data_size);
      rt2500usb_register_write(rt2x00dev, MAC_CSR8, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
      rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0xff);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);

      rt2500usb_register_read(rt2x00dev, MAC_CSR18, &reg);
      rt2x00_set_field16(&reg, MAC_CSR18_DELAY_AFTER_BEACON, 90);
      rt2500usb_register_write(rt2x00dev, MAC_CSR18, reg);

      rt2500usb_register_read(rt2x00dev, PHY_CSR4, &reg);
      rt2x00_set_field16(&reg, PHY_CSR4_LOW_RF_LE, 1);
      rt2500usb_register_write(rt2x00dev, PHY_CSR4, reg);

      rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR1_AUTO_SEQUENCE, 1);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);

      return 0;
}

static int rt2500usb_init_bbp(struct rt2x00_dev *rt2x00dev)
{
      unsigned int i;
      u16 eeprom;
      u8 value;
      u8 reg_id;

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt2500usb_bbp_read(rt2x00dev, 0, &value);
            if ((value != 0xff) && (value != 0x00))
                  goto continue_csr_init;
            NOTICE(rt2x00dev, "Waiting for BBP register.\n");
            udelay(REGISTER_BUSY_DELAY);
      }

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

continue_csr_init:
      rt2500usb_bbp_write(rt2x00dev, 3, 0x02);
      rt2500usb_bbp_write(rt2x00dev, 4, 0x19);
      rt2500usb_bbp_write(rt2x00dev, 14, 0x1c);
      rt2500usb_bbp_write(rt2x00dev, 15, 0x30);
      rt2500usb_bbp_write(rt2x00dev, 16, 0xac);
      rt2500usb_bbp_write(rt2x00dev, 18, 0x18);
      rt2500usb_bbp_write(rt2x00dev, 19, 0xff);
      rt2500usb_bbp_write(rt2x00dev, 20, 0x1e);
      rt2500usb_bbp_write(rt2x00dev, 21, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 22, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 23, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 24, 0x80);
      rt2500usb_bbp_write(rt2x00dev, 25, 0x50);
      rt2500usb_bbp_write(rt2x00dev, 26, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 27, 0x23);
      rt2500usb_bbp_write(rt2x00dev, 30, 0x10);
      rt2500usb_bbp_write(rt2x00dev, 31, 0x2b);
      rt2500usb_bbp_write(rt2x00dev, 32, 0xb9);
      rt2500usb_bbp_write(rt2x00dev, 34, 0x12);
      rt2500usb_bbp_write(rt2x00dev, 35, 0x50);
      rt2500usb_bbp_write(rt2x00dev, 39, 0xc4);
      rt2500usb_bbp_write(rt2x00dev, 40, 0x02);
      rt2500usb_bbp_write(rt2x00dev, 41, 0x60);
      rt2500usb_bbp_write(rt2x00dev, 53, 0x10);
      rt2500usb_bbp_write(rt2x00dev, 54, 0x18);
      rt2500usb_bbp_write(rt2x00dev, 56, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 57, 0x10);
      rt2500usb_bbp_write(rt2x00dev, 58, 0x08);
      rt2500usb_bbp_write(rt2x00dev, 61, 0x60);
      rt2500usb_bbp_write(rt2x00dev, 62, 0x10);
      rt2500usb_bbp_write(rt2x00dev, 75, 0xff);

      DEBUG(rt2x00dev, "Start initialization from EEPROM...\n");
      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);
                  DEBUG(rt2x00dev, "BBP: 0x%02x, value: 0x%02x.\n",
                        reg_id, value);
                  rt2500usb_bbp_write(rt2x00dev, reg_id, value);
            }
      }
      DEBUG(rt2x00dev, "...End initialization from EEPROM.\n");

      return 0;
}

/*
 * Device state switch handlers.
 */
static void rt2500usb_toggle_rx(struct rt2x00_dev *rt2x00dev,
                        enum dev_state state)
{
      u16 reg;

      rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR2_DISABLE_RX,
                     state == STATE_RADIO_RX_OFF);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);
}

static int rt2500usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
      /*
       * Initialize all registers.
       */
      if (rt2500usb_init_registers(rt2x00dev) ||
          rt2500usb_init_bbp(rt2x00dev)) {
            ERROR(rt2x00dev, "Register initialization failed.\n");
            return -EIO;
      }

      rt2x00usb_enable_radio(rt2x00dev);

      /*
       * Enable LED
       */
      rt2500usb_enable_led(rt2x00dev);

      return 0;
}

static void rt2500usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
      /*
       * Disable LED
       */
      rt2500usb_disable_led(rt2x00dev);

      rt2500usb_register_write(rt2x00dev, MAC_CSR13, 0x2121);
      rt2500usb_register_write(rt2x00dev, MAC_CSR14, 0x2121);

      /*
       * Disable synchronisation.
       */
      rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);

      rt2x00usb_disable_radio(rt2x00dev);
}

static int rt2500usb_set_state(struct rt2x00_dev *rt2x00dev,
                         enum dev_state state)
{
      u16 reg;
      u16 reg2;
      unsigned int i;
      char put_to_sleep;
      char bbp_state;
      char rf_state;

      put_to_sleep = (state != STATE_AWAKE);

      reg = 0;
      rt2x00_set_field16(&reg, MAC_CSR17_BBP_DESIRE_STATE, state);
      rt2x00_set_field16(&reg, MAC_CSR17_RF_DESIRE_STATE, state);
      rt2x00_set_field16(&reg, MAC_CSR17_PUT_TO_SLEEP, put_to_sleep);
      rt2500usb_register_write(rt2x00dev, MAC_CSR17, reg);
      rt2x00_set_field16(&reg, MAC_CSR17_SET_STATE, 1);
      rt2500usb_register_write(rt2x00dev, MAC_CSR17, 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++) {
            rt2500usb_register_read(rt2x00dev, MAC_CSR17, &reg2);
            bbp_state = rt2x00_get_field16(reg2, MAC_CSR17_BBP_CURR_STATE);
            rf_state = rt2x00_get_field16(reg2, MAC_CSR17_RF_CURR_STATE);
            if (bbp_state == state && rf_state == state)
                  return 0;
            rt2500usb_register_write(rt2x00dev, MAC_CSR17, reg);
            msleep(30);
      }

      NOTICE(rt2x00dev, "Device failed to enter state %d, "
             "current device state: bbp %d and rf %d.\n",
             state, bbp_state, rf_state);

      return -EBUSY;
}

static int rt2500usb_set_device_state(struct rt2x00_dev *rt2x00dev,
                              enum dev_state state)
{
      int retval = 0;

      switch (state) {
      case STATE_RADIO_ON:
            retval = rt2500usb_enable_radio(rt2x00dev);
            break;
      case STATE_RADIO_OFF:
            rt2500usb_disable_radio(rt2x00dev);
            break;
      case STATE_RADIO_RX_ON:
      case STATE_RADIO_RX_OFF:
            rt2500usb_toggle_rx(rt2x00dev, state);
            break;
      case STATE_DEEP_SLEEP:
      case STATE_SLEEP:
      case STATE_STANDBY:
      case STATE_AWAKE:
            retval = rt2500usb_set_state(rt2x00dev, state);
            break;
      default:
            retval = -ENOTSUPP;
            break;
      }

      return retval;
}

/*
 * TX descriptor initialization
 */
static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                            struct data_desc *txd,
                            struct txdata_entry_desc *desc,
                            struct ieee80211_hdr *ieee80211hdr,
                            unsigned int length,
                            struct ieee80211_tx_control *control)
{
      u32 word;

      /*
       * Start writing the descriptor words.
       */
      rt2x00_desc_read(txd, 1, &word);
      rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, IEEE80211_HEADER);
      rt2x00_set_field32(&word, TXD_W1_AIFS, desc->aifs);
      rt2x00_set_field32(&word, TXD_W1_CWMIN, desc->cw_min);
      rt2x00_set_field32(&word, TXD_W1_CWMAX, desc->cw_max);
      rt2x00_desc_write(txd, 1, word);

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

      rt2x00_desc_read(txd, 0, &word);
      rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, control->retry_limit);
      rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
                     test_bit(ENTRY_TXD_MORE_FRAG, &desc->flags));
      rt2x00_set_field32(&word, TXD_W0_ACK,
                     !(control->flags & IEEE80211_TXCTL_NO_ACK));
      rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
                     test_bit(ENTRY_TXD_REQ_TIMESTAMP, &desc->flags));
      rt2x00_set_field32(&word, TXD_W0_OFDM,
                     test_bit(ENTRY_TXD_OFDM_RATE, &desc->flags));
      rt2x00_set_field32(&word, TXD_W0_NEW_SEQ,
                     !!(control->flags & IEEE80211_TXCTL_FIRST_FRAGMENT));
      rt2x00_set_field32(&word, TXD_W0_IFS, desc->ifs);
      rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, length);
      rt2x00_set_field32(&word, TXD_W0_CIPHER, CIPHER_NONE);
      rt2x00_desc_write(txd, 0, word);
}

static int rt2500usb_get_tx_data_len(struct rt2x00_dev *rt2x00dev,
                             struct sk_buff *skb)
{
      int length;

      /*
       * The length _must_ be a multiple of 2,
       * but it must _not_ be a multiple of the USB packet size.
       */
      length = roundup(skb->len, 2);
      length += (2 * !(length % rt2x00dev->usb_maxpacket));

      return length;
}

/*
 * TX data initialization
 */
static void rt2500usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
                            unsigned int queue)
{
      u16 reg;

      if (queue != IEEE80211_TX_QUEUE_BEACON)
            return;

      rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
      if (!rt2x00_get_field16(reg, TXRX_CSR19_BEACON_GEN)) {
            rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 1);
            /*
             * Beacon generation will fail initially.
             * To prevent this we need to register the TXRX_CSR19
             * register several times.
             */
            rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
            rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
            rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
            rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
            rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
      }
}

/*
 * RX control handlers
 */
static void rt2500usb_fill_rxdone(struct data_entry *entry,
                          struct rxdata_entry_desc *desc)
{
      struct urb *urb = entry->priv;
      struct data_desc *rxd = (struct data_desc *)(entry->skb->data +
                                         (urb->actual_length -
                                          entry->ring->desc_size));
      u32 word0;
      u32 word1;

      rt2x00_desc_read(rxd, 0, &word0);
      rt2x00_desc_read(rxd, 1, &word1);

      desc->flags = 0;
      if (rt2x00_get_field32(word0, RXD_W0_CRC_ERROR))
            desc->flags |= RX_FLAG_FAILED_FCS_CRC;
      if (rt2x00_get_field32(word0, RXD_W0_PHYSICAL_ERROR))
            desc->flags |= RX_FLAG_FAILED_PLCP_CRC;

      /*
       * Obtain the status about this packet.
       */
      desc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
      desc->rssi = rt2x00_get_field32(word1, RXD_W1_RSSI) -
          entry->ring->rt2x00dev->rssi_offset;
      desc->ofdm = rt2x00_get_field32(word0, RXD_W0_OFDM);
      desc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);

      return;
}

/*
 * Interrupt functions.
 */
static void rt2500usb_beacondone(struct urb *urb)
{
      struct data_entry *entry = (struct data_entry *)urb->context;
      struct data_ring *ring = entry->ring;

      if (!test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags))
            return;

      /*
       * Check if this was the guardian beacon,
       * if that was the case we need to send the real beacon now.
       * Otherwise we should free the sk_buffer, the device
       * should be doing the rest of the work now.
       */
      if (ring->index == 1) {
            rt2x00_ring_index_done_inc(ring);
            entry = rt2x00_get_data_entry(ring);
            usb_submit_urb(entry->priv, GFP_ATOMIC);
            rt2x00_ring_index_inc(ring);
      } else if (ring->index_done == 1) {
            entry = rt2x00_get_data_entry_done(ring);
            if (entry->skb) {
                  dev_kfree_skb(entry->skb);
                  entry->skb = NULL;
            }
            rt2x00_ring_index_done_inc(ring);
      }
}

/*
 * Device probe functions.
 */
static int rt2500usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
{
      u16 word;
      u8 *mac;

      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)) {
            DECLARE_MAC_BUF(macbuf);

            random_ether_addr(mac);
            EEPROM(rt2x00dev, "MAC: %s\n", print_mac(macbuf, 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, 0);
            rt2x00_set_field16(&word, EEPROM_ANTENNA_RX_DEFAULT, 0);
            rt2x00_set_field16(&word, EEPROM_ANTENNA_LED_MODE, 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, RF2522);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_ANTENNA, word);
            EEPROM(rt2x00dev, "Antenna: 0x%04x\n", word);
      }

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

      rt2x00_eeprom_read(rt2x00dev, EEPROM_CALIBRATE_OFFSET, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_CALIBRATE_OFFSET_RSSI,
                           DEFAULT_RSSI_OFFSET);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_CALIBRATE_OFFSET, word);
            EEPROM(rt2x00dev, "Calibrate offset: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_THRESHOLD, 45);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE, word);
            EEPROM(rt2x00dev, "BBPtune: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCUPPER, 0x40);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_VGC, word);
            EEPROM(rt2x00dev, "BBPtune vgc: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R17_LOW, 0x48);
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R17_HIGH, 0x41);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R17, word);
            EEPROM(rt2x00dev, "BBPtune r17: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R24_LOW, 0x40);
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R24_HIGH, 0x80);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R24, word);
            EEPROM(rt2x00dev, "BBPtune r24: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R25_LOW, 0x40);
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R25_HIGH, 0x50);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R25, word);
            EEPROM(rt2x00dev, "BBPtune r25: 0x%04x\n", word);
      }

      rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &word);
      if (word == 0xffff) {
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R61_LOW, 0x60);
            rt2x00_set_field16(&word, EEPROM_BBPTUNE_R61_HIGH, 0x6d);
            rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R61, word);
            EEPROM(rt2x00dev, "BBPtune r61: 0x%04x\n", word);
      }

      return 0;
}

static int rt2500usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
{
      u16 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);
      rt2500usb_register_read(rt2x00dev, MAC_CSR0, &reg);
      rt2x00_set_chip(rt2x00dev, RT2570, value, reg);

      if (!rt2x00_check_rev(&rt2x00dev->chip, 0)) {
            ERROR(rt2x00dev, "Invalid RT chipset detected.\n");
            return -ENODEV;
      }

      if (!rt2x00_rf(&rt2x00dev->chip, RF2522) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2523) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2524) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2525) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2525E) &&
          !rt2x00_rf(&rt2x00dev->chip, RF5222)) {
            ERROR(rt2x00dev, "Invalid RF chipset detected.\n");
            return -ENODEV;
      }

      /*
       * Identify default antenna configuration.
       */
      rt2x00dev->hw->conf.antenna_sel_tx =
          rt2x00_get_field16(eeprom, EEPROM_ANTENNA_TX_DEFAULT);
      rt2x00dev->hw->conf.antenna_sel_rx =
          rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RX_DEFAULT);

      /*
       * Store led mode, for correct led behaviour.
       */
      rt2x00dev->led_mode =
          rt2x00_get_field16(eeprom, EEPROM_ANTENNA_LED_MODE);

      /*
       * Check if the BBP tuning should be disabled.
       */
      rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &eeprom);
      if (rt2x00_get_field16(eeprom, EEPROM_NIC_DYN_BBP_TUNE))
            __set_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags);

      /*
       * Read the RSSI <-> dBm offset information.
       */
      rt2x00_eeprom_read(rt2x00dev, EEPROM_CALIBRATE_OFFSET, &eeprom);
      rt2x00dev->rssi_offset =
          rt2x00_get_field16(eeprom, EEPROM_CALIBRATE_OFFSET_RSSI);

      return 0;
}

/*
 * RF value list for RF2522
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2522[] = {
      { 1,  0x00002050, 0x000c1fda, 0x00000101, 0 },
      { 2,  0x00002050, 0x000c1fee, 0x00000101, 0 },
      { 3,  0x00002050, 0x000c2002, 0x00000101, 0 },
      { 4,  0x00002050, 0x000c2016, 0x00000101, 0 },
      { 5,  0x00002050, 0x000c202a, 0x00000101, 0 },
      { 6,  0x00002050, 0x000c203e, 0x00000101, 0 },
      { 7,  0x00002050, 0x000c2052, 0x00000101, 0 },
      { 8,  0x00002050, 0x000c2066, 0x00000101, 0 },
      { 9,  0x00002050, 0x000c207a, 0x00000101, 0 },
      { 10, 0x00002050, 0x000c208e, 0x00000101, 0 },
      { 11, 0x00002050, 0x000c20a2, 0x00000101, 0 },
      { 12, 0x00002050, 0x000c20b6, 0x00000101, 0 },
      { 13, 0x00002050, 0x000c20ca, 0x00000101, 0 },
      { 14, 0x00002050, 0x000c20fa, 0x00000101, 0 },
};

/*
 * RF value list for RF2523
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2523[] = {
      { 1,  0x00022010, 0x00000c9e, 0x000e0111, 0x00000a1b },
      { 2,  0x00022010, 0x00000ca2, 0x000e0111, 0x00000a1b },
      { 3,  0x00022010, 0x00000ca6, 0x000e0111, 0x00000a1b },
      { 4,  0x00022010, 0x00000caa, 0x000e0111, 0x00000a1b },
      { 5,  0x00022010, 0x00000cae, 0x000e0111, 0x00000a1b },
      { 6,  0x00022010, 0x00000cb2, 0x000e0111, 0x00000a1b },
      { 7,  0x00022010, 0x00000cb6, 0x000e0111, 0x00000a1b },
      { 8,  0x00022010, 0x00000cba, 0x000e0111, 0x00000a1b },
      { 9,  0x00022010, 0x00000cbe, 0x000e0111, 0x00000a1b },
      { 10, 0x00022010, 0x00000d02, 0x000e0111, 0x00000a1b },
      { 11, 0x00022010, 0x00000d06, 0x000e0111, 0x00000a1b },
      { 12, 0x00022010, 0x00000d0a, 0x000e0111, 0x00000a1b },
      { 13, 0x00022010, 0x00000d0e, 0x000e0111, 0x00000a1b },
      { 14, 0x00022010, 0x00000d1a, 0x000e0111, 0x00000a03 },
};

/*
 * RF value list for RF2524
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2524[] = {
      { 1,  0x00032020, 0x00000c9e, 0x00000101, 0x00000a1b },
      { 2,  0x00032020, 0x00000ca2, 0x00000101, 0x00000a1b },
      { 3,  0x00032020, 0x00000ca6, 0x00000101, 0x00000a1b },
      { 4,  0x00032020, 0x00000caa, 0x00000101, 0x00000a1b },
      { 5,  0x00032020, 0x00000cae, 0x00000101, 0x00000a1b },
      { 6,  0x00032020, 0x00000cb2, 0x00000101, 0x00000a1b },
      { 7,  0x00032020, 0x00000cb6, 0x00000101, 0x00000a1b },
      { 8,  0x00032020, 0x00000cba, 0x00000101, 0x00000a1b },
      { 9,  0x00032020, 0x00000cbe, 0x00000101, 0x00000a1b },
      { 10, 0x00032020, 0x00000d02, 0x00000101, 0x00000a1b },
      { 11, 0x00032020, 0x00000d06, 0x00000101, 0x00000a1b },
      { 12, 0x00032020, 0x00000d0a, 0x00000101, 0x00000a1b },
      { 13, 0x00032020, 0x00000d0e, 0x00000101, 0x00000a1b },
      { 14, 0x00032020, 0x00000d1a, 0x00000101, 0x00000a03 },
};

/*
 * RF value list for RF2525
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2525[] = {
      { 1,  0x00022020, 0x00080c9e, 0x00060111, 0x00000a1b },
      { 2,  0x00022020, 0x00080ca2, 0x00060111, 0x00000a1b },
      { 3,  0x00022020, 0x00080ca6, 0x00060111, 0x00000a1b },
      { 4,  0x00022020, 0x00080caa, 0x00060111, 0x00000a1b },
      { 5,  0x00022020, 0x00080cae, 0x00060111, 0x00000a1b },
      { 6,  0x00022020, 0x00080cb2, 0x00060111, 0x00000a1b },
      { 7,  0x00022020, 0x00080cb6, 0x00060111, 0x00000a1b },
      { 8,  0x00022020, 0x00080cba, 0x00060111, 0x00000a1b },
      { 9,  0x00022020, 0x00080cbe, 0x00060111, 0x00000a1b },
      { 10, 0x00022020, 0x00080d02, 0x00060111, 0x00000a1b },
      { 11, 0x00022020, 0x00080d06, 0x00060111, 0x00000a1b },
      { 12, 0x00022020, 0x00080d0a, 0x00060111, 0x00000a1b },
      { 13, 0x00022020, 0x00080d0e, 0x00060111, 0x00000a1b },
      { 14, 0x00022020, 0x00080d1a, 0x00060111, 0x00000a03 },
};

/*
 * RF value list for RF2525e
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2525e[] = {
      { 1,  0x00022010, 0x0000089a, 0x00060111, 0x00000e1b },
      { 2,  0x00022010, 0x0000089e, 0x00060111, 0x00000e07 },
      { 3,  0x00022010, 0x0000089e, 0x00060111, 0x00000e1b },
      { 4,  0x00022010, 0x000008a2, 0x00060111, 0x00000e07 },
      { 5,  0x00022010, 0x000008a2, 0x00060111, 0x00000e1b },
      { 6,  0x00022010, 0x000008a6, 0x00060111, 0x00000e07 },
      { 7,  0x00022010, 0x000008a6, 0x00060111, 0x00000e1b },
      { 8,  0x00022010, 0x000008aa, 0x00060111, 0x00000e07 },
      { 9,  0x00022010, 0x000008aa, 0x00060111, 0x00000e1b },
      { 10, 0x00022010, 0x000008ae, 0x00060111, 0x00000e07 },
      { 11, 0x00022010, 0x000008ae, 0x00060111, 0x00000e1b },
      { 12, 0x00022010, 0x000008b2, 0x00060111, 0x00000e07 },
      { 13, 0x00022010, 0x000008b2, 0x00060111, 0x00000e1b },
      { 14, 0x00022010, 0x000008b6, 0x00060111, 0x00000e23 },
};

/*
 * RF value list for RF5222
 * Supports: 2.4 GHz & 5.2 GHz
 */
static const struct rf_channel rf_vals_5222[] = {
      { 1,  0x00022020, 0x00001136, 0x00000101, 0x00000a0b },
      { 2,  0x00022020, 0x0000113a, 0x00000101, 0x00000a0b },
      { 3,  0x00022020, 0x0000113e, 0x00000101, 0x00000a0b },
      { 4,  0x00022020, 0x00001182, 0x00000101, 0x00000a0b },
      { 5,  0x00022020, 0x00001186, 0x00000101, 0x00000a0b },
      { 6,  0x00022020, 0x0000118a, 0x00000101, 0x00000a0b },
      { 7,  0x00022020, 0x0000118e, 0x00000101, 0x00000a0b },
      { 8,  0x00022020, 0x00001192, 0x00000101, 0x00000a0b },
      { 9,  0x00022020, 0x00001196, 0x00000101, 0x00000a0b },
      { 10, 0x00022020, 0x0000119a, 0x00000101, 0x00000a0b },
      { 11, 0x00022020, 0x0000119e, 0x00000101, 0x00000a0b },
      { 12, 0x00022020, 0x000011a2, 0x00000101, 0x00000a0b },
      { 13, 0x00022020, 0x000011a6, 0x00000101, 0x00000a0b },
      { 14, 0x00022020, 0x000011ae, 0x00000101, 0x00000a1b },

      /* 802.11 UNI / HyperLan 2 */
      { 36, 0x00022010, 0x00018896, 0x00000101, 0x00000a1f },
      { 40, 0x00022010, 0x0001889a, 0x00000101, 0x00000a1f },
      { 44, 0x00022010, 0x0001889e, 0x00000101, 0x00000a1f },
      { 48, 0x00022010, 0x000188a2, 0x00000101, 0x00000a1f },
      { 52, 0x00022010, 0x000188a6, 0x00000101, 0x00000a1f },
      { 66, 0x00022010, 0x000188aa, 0x00000101, 0x00000a1f },
      { 60, 0x00022010, 0x000188ae, 0x00000101, 0x00000a1f },
      { 64, 0x00022010, 0x000188b2, 0x00000101, 0x00000a1f },

      /* 802.11 HyperLan 2 */
      { 100, 0x00022010, 0x00008802, 0x00000101, 0x00000a0f },
      { 104, 0x00022010, 0x00008806, 0x00000101, 0x00000a0f },
      { 108, 0x00022010, 0x0000880a, 0x00000101, 0x00000a0f },
      { 112, 0x00022010, 0x0000880e, 0x00000101, 0x00000a0f },
      { 116, 0x00022010, 0x00008812, 0x00000101, 0x00000a0f },
      { 120, 0x00022010, 0x00008816, 0x00000101, 0x00000a0f },
      { 124, 0x00022010, 0x0000881a, 0x00000101, 0x00000a0f },
      { 128, 0x00022010, 0x0000881e, 0x00000101, 0x00000a0f },
      { 132, 0x00022010, 0x00008822, 0x00000101, 0x00000a0f },
      { 136, 0x00022010, 0x00008826, 0x00000101, 0x00000a0f },

      /* 802.11 UNII */
      { 140, 0x00022010, 0x0000882a, 0x00000101, 0x00000a0f },
      { 149, 0x00022020, 0x000090a6, 0x00000101, 0x00000a07 },
      { 153, 0x00022020, 0x000090ae, 0x00000101, 0x00000a07 },
      { 157, 0x00022020, 0x000090b6, 0x00000101, 0x00000a07 },
      { 161, 0x00022020, 0x000090be, 0x00000101, 0x00000a07 },
};

static void rt2500usb_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
{
      struct hw_mode_spec *spec = &rt2x00dev->spec;
      u8 *txpower;
      unsigned int i;

      /*
       * Initialize all hw fields.
       */
      rt2x00dev->hw->flags =
          IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE |
          IEEE80211_HW_RX_INCLUDES_FCS |
          IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
      rt2x00dev->hw->extra_tx_headroom = TXD_DESC_SIZE;
      rt2x00dev->hw->max_signal = MAX_SIGNAL;
      rt2x00dev->hw->max_rssi = MAX_RX_SSI;
      rt2x00dev->hw->queues = 2;

      SET_IEEE80211_DEV(rt2x00dev->hw, &rt2x00dev_usb(rt2x00dev)->dev);
      SET_IEEE80211_PERM_ADDR(rt2x00dev->hw,
                        rt2x00_eeprom_addr(rt2x00dev,
                                       EEPROM_MAC_ADDR_0));

      /*
       * Convert tx_power array in eeprom.
       */
      txpower = rt2x00_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_START);
      for (i = 0; i < 14; i++)
            txpower[i] = TXPOWER_FROM_DEV(txpower[i]);

      /*
       * Initialize hw_mode information.
       */
      spec->num_modes = 2;
      spec->num_rates = 12;
      spec->tx_power_a = NULL;
      spec->tx_power_bg = txpower;
      spec->tx_power_default = DEFAULT_TXPOWER;

      if (rt2x00_rf(&rt2x00dev->chip, RF2522)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_bg_2522);
            spec->channels = rf_vals_bg_2522;
      } else if (rt2x00_rf(&rt2x00dev->chip, RF2523)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_bg_2523);
            spec->channels = rf_vals_bg_2523;
      } else if (rt2x00_rf(&rt2x00dev->chip, RF2524)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_bg_2524);
            spec->channels = rf_vals_bg_2524;
      } else if (rt2x00_rf(&rt2x00dev->chip, RF2525)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_bg_2525);
            spec->channels = rf_vals_bg_2525;
      } else if (rt2x00_rf(&rt2x00dev->chip, RF2525E)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_bg_2525e);
            spec->channels = rf_vals_bg_2525e;
      } else if (rt2x00_rf(&rt2x00dev->chip, RF5222)) {
            spec->num_channels = ARRAY_SIZE(rf_vals_5222);
            spec->channels = rf_vals_5222;
            spec->num_modes = 3;
      }
}

static int rt2500usb_probe_hw(struct rt2x00_dev *rt2x00dev)
{
      int retval;

      /*
       * Allocate eeprom data.
       */
      retval = rt2500usb_validate_eeprom(rt2x00dev);
      if (retval)
            return retval;

      retval = rt2500usb_init_eeprom(rt2x00dev);
      if (retval)
            return retval;

      /*
       * Initialize hw specifications.
       */
      rt2500usb_probe_hw_mode(rt2x00dev);

      /*
       * This device requires the beacon ring
       */
      __set_bit(DRIVER_REQUIRE_BEACON_RING, &rt2x00dev->flags);

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

      return 0;
}

/*
 * IEEE80211 stack callback functions.
 */
static void rt2500usb_configure_filter(struct ieee80211_hw *hw,
                               unsigned int changed_flags,
                               unsigned int *total_flags,
                               int mc_count,
                               struct dev_addr_list *mc_list)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;
      struct interface *intf = &rt2x00dev->interface;
      u16 reg;

      /*
       * Mask off any flags we are going to ignore from
       * the total_flags field.
       */
      *total_flags &=
          FIF_ALLMULTI |
          FIF_FCSFAIL |
          FIF_PLCPFAIL |
          FIF_CONTROL |
          FIF_OTHER_BSS |
          FIF_PROMISC_IN_BSS;

      /*
       * Apply some rules to the filters:
       * - Some filters imply different filters to be set.
       * - Some things we can't filter out at all.
       * - Some filters are set based on interface type.
       */
      if (mc_count)
            *total_flags |= FIF_ALLMULTI;
      if (*total_flags & FIF_OTHER_BSS ||
          *total_flags & FIF_PROMISC_IN_BSS)
            *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
      if (is_interface_type(intf, IEEE80211_IF_TYPE_AP))
            *total_flags |= FIF_PROMISC_IN_BSS;

      /*
       * Check if there is any work left for us.
       */
      if (intf->filter == *total_flags)
            return;
      intf->filter = *total_flags;

      /*
       * When in atomic context, reschedule and let rt2x00lib
       * call this function again.
       */
      if (in_atomic()) {
            queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
            return;
      }

      /*
       * 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.
       */
      rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_CRC,
                     !(*total_flags & FIF_FCSFAIL));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_PHYSICAL,
                     !(*total_flags & FIF_PLCPFAIL));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_CONTROL,
                     !(*total_flags & FIF_CONTROL));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_NOT_TO_ME,
                     !(*total_flags & FIF_PROMISC_IN_BSS));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_TODS,
                     !(*total_flags & FIF_PROMISC_IN_BSS));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_VERSION_ERROR, 1);
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_MULTICAST,
                     !(*total_flags & FIF_ALLMULTI));
      rt2x00_set_field16(&reg, TXRX_CSR2_DROP_BROADCAST, 0);
      rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);
}

static int rt2500usb_beacon_update(struct ieee80211_hw *hw,
                           struct sk_buff *skb,
                           struct ieee80211_tx_control *control)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;
      struct usb_device *usb_dev =
          interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
      struct data_ring *ring =
          rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
      struct data_entry *beacon;
      struct data_entry *guardian;
      int pipe = usb_sndbulkpipe(usb_dev, 1);
      int length;

      /*
       * Just in case the ieee80211 doesn't set this,
       * but we need this queue set for the descriptor
       * initialization.
       */
      control->queue = IEEE80211_TX_QUEUE_BEACON;

      /*
       * Obtain 2 entries, one for the guardian byte,
       * the second for the actual beacon.
       */
      guardian = rt2x00_get_data_entry(ring);
      rt2x00_ring_index_inc(ring);
      beacon = rt2x00_get_data_entry(ring);

      /*
       * First we create the beacon.
       */
      skb_push(skb, ring->desc_size);
      memset(skb->data, 0, ring->desc_size);

      rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data,
                        (struct ieee80211_hdr *)(skb->data +
                                           ring->desc_size),
                        skb->len - ring->desc_size, control);

      length = rt2500usb_get_tx_data_len(rt2x00dev, skb);

      usb_fill_bulk_urb(beacon->priv, usb_dev, pipe,
                    skb->data, length, rt2500usb_beacondone, beacon);

      beacon->skb = skb;

      /*
       * Second we need to create the guardian byte.
       * We only need a single byte, so lets recycle
       * the 'flags' field we are not using for beacons.
       */
      guardian->flags = 0;
      usb_fill_bulk_urb(guardian->priv, usb_dev, pipe,
                    &guardian->flags, 1, rt2500usb_beacondone, guardian);

      /*
       * Send out the guardian byte.
       */
      usb_submit_urb(guardian->priv, GFP_ATOMIC);

      /*
       * Enable beacon generation.
       */
      rt2500usb_kick_tx_queue(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);

      return 0;
}

static const struct ieee80211_ops rt2500usb_mac80211_ops = {
      .tx               = rt2x00mac_tx,
      .start                  = rt2x00mac_start,
      .stop             = rt2x00mac_stop,
      .add_interface          = rt2x00mac_add_interface,
      .remove_interface = rt2x00mac_remove_interface,
      .config                 = rt2x00mac_config,
      .config_interface = rt2x00mac_config_interface,
      .configure_filter = rt2500usb_configure_filter,
      .get_stats        = rt2x00mac_get_stats,
      .erp_ie_changed         = rt2x00mac_erp_ie_changed,
      .conf_tx          = rt2x00mac_conf_tx,
      .get_tx_stats           = rt2x00mac_get_tx_stats,
      .beacon_update          = rt2500usb_beacon_update,
};

static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
      .probe_hw         = rt2500usb_probe_hw,
      .initialize       = rt2x00usb_initialize,
      .uninitialize           = rt2x00usb_uninitialize,
      .set_device_state = rt2500usb_set_device_state,
      .link_stats       = rt2500usb_link_stats,
      .reset_tuner            = rt2500usb_reset_tuner,
      .link_tuner       = rt2500usb_link_tuner,
      .write_tx_desc          = rt2500usb_write_tx_desc,
      .write_tx_data          = rt2x00usb_write_tx_data,
      .get_tx_data_len  = rt2500usb_get_tx_data_len,
      .kick_tx_queue          = rt2500usb_kick_tx_queue,
      .fill_rxdone            = rt2500usb_fill_rxdone,
      .config_mac_addr  = rt2500usb_config_mac_addr,
      .config_bssid           = rt2500usb_config_bssid,
      .config_type            = rt2500usb_config_type,
      .config_preamble  = rt2500usb_config_preamble,
      .config                 = rt2500usb_config,
};

static const struct rt2x00_ops rt2500usb_ops = {
      .name       = DRV_NAME,
      .rxd_size   = RXD_DESC_SIZE,
      .txd_size   = TXD_DESC_SIZE,
      .eeprom_size      = EEPROM_SIZE,
      .rf_size    = RF_SIZE,
      .lib        = &rt2500usb_rt2x00_ops,
      .hw         = &rt2500usb_mac80211_ops,
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
      .debugfs    = &rt2500usb_rt2x00debug,
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
};

/*
 * rt2500usb module information.
 */
static struct usb_device_id rt2500usb_device_table[] = {
      /* ASUS */
      { USB_DEVICE(0x0b05, 0x1706), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0b05, 0x1707), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Belkin */
      { USB_DEVICE(0x050d, 0x7050), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x050d, 0x7051), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x050d, 0x705a), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Cisco Systems */
      { USB_DEVICE(0x13b1, 0x000d), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x13b1, 0x0011), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x13b1, 0x001a), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Conceptronic */
      { USB_DEVICE(0x14b2, 0x3c02), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* D-LINK */
      { USB_DEVICE(0x2001, 0x3c00), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Gigabyte */
      { USB_DEVICE(0x1044, 0x8001), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x1044, 0x8007), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Hercules */
      { USB_DEVICE(0x06f8, 0xe000), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Melco */
      { USB_DEVICE(0x0411, 0x0066), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0411, 0x0067), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0411, 0x008b), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0411, 0x0097), USB_DEVICE_DATA(&rt2500usb_ops) },

      /* MSI */
      { USB_DEVICE(0x0db0, 0x6861), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0db0, 0x6865), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x0db0, 0x6869), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Ralink */
      { USB_DEVICE(0x148f, 0x1706), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x148f, 0x2570), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x148f, 0x2573), USB_DEVICE_DATA(&rt2500usb_ops) },
      { USB_DEVICE(0x148f, 0x9020), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Siemens */
      { USB_DEVICE(0x0681, 0x3c06), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* SMC */
      { USB_DEVICE(0x0707, 0xee13), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Spairon */
      { USB_DEVICE(0x114b, 0x0110), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Trust */
      { USB_DEVICE(0x0eb0, 0x9020), USB_DEVICE_DATA(&rt2500usb_ops) },
      /* Zinwell */
      { USB_DEVICE(0x5a57, 0x0260), USB_DEVICE_DATA(&rt2500usb_ops) },
      { 0, }
};

MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("Ralink RT2500 USB Wireless LAN driver.");
MODULE_SUPPORTED_DEVICE("Ralink RT2570 USB chipset based cards");
MODULE_DEVICE_TABLE(usb, rt2500usb_device_table);
MODULE_LICENSE("GPL");

static struct usb_driver rt2500usb_driver = {
      .name       = DRV_NAME,
      .id_table   = rt2500usb_device_table,
      .probe            = rt2x00usb_probe,
      .disconnect = rt2x00usb_disconnect,
      .suspend    = rt2x00usb_suspend,
      .resume           = rt2x00usb_resume,
};

static int __init rt2500usb_init(void)
{
      return usb_register(&rt2500usb_driver);
}

static void __exit rt2500usb_exit(void)
{
      usb_deregister(&rt2500usb_driver);
}

module_init(rt2500usb_init);
module_exit(rt2500usb_exit);

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