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

/*
 * Set enviroment defines for rt2x00.h
 */
#define DRV_NAME "rt73usb"

#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 "rt73usb.h"

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt73usb_register_read and rt73usb_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 rt73usb_register_read(const struct rt2x00_dev *rt2x00dev,
                               const unsigned int offset, u32 *value)
{
      __le32 reg;
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
                              USB_VENDOR_REQUEST_IN, offset,
                              &reg, sizeof(u32), REGISTER_TIMEOUT);
      *value = le32_to_cpu(reg);
}

static inline void rt73usb_register_multiread(const struct rt2x00_dev
                                    *rt2x00dev,
                                    const unsigned int offset,
                                    void *value, const u32 length)
{
      int timeout = REGISTER_TIMEOUT * (length / sizeof(u32));
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
                              USB_VENDOR_REQUEST_IN, offset,
                              value, length, timeout);
}

static inline void rt73usb_register_write(const struct rt2x00_dev *rt2x00dev,
                                const unsigned int offset, u32 value)
{
      __le32 reg = cpu_to_le32(value);
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
                              USB_VENDOR_REQUEST_OUT, offset,
                              &reg, sizeof(u32), REGISTER_TIMEOUT);
}

static inline void rt73usb_register_multiwrite(const struct rt2x00_dev
                                     *rt2x00dev,
                                     const unsigned int offset,
                                     void *value, const u32 length)
{
      int timeout = REGISTER_TIMEOUT * (length / sizeof(u32));
      rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
                              USB_VENDOR_REQUEST_OUT, offset,
                              value, length, timeout);
}

static u32 rt73usb_bbp_check(const struct rt2x00_dev *rt2x00dev)
{
      u32 reg;
      unsigned int i;

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt73usb_register_read(rt2x00dev, PHY_CSR3, &reg);
            if (!rt2x00_get_field32(reg, PHY_CSR3_BUSY))
                  break;
            udelay(REGISTER_BUSY_DELAY);
      }

      return reg;
}

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

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt73usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR3 register busy. Write failed.\n");
            return;
      }

      /*
       * Write the data into the BBP.
       */
      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);

      rt73usb_register_write(rt2x00dev, PHY_CSR3, reg);
}

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

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt73usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
            return;
      }

      /*
       * Write the request into the BBP.
       */
      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);

      rt73usb_register_write(rt2x00dev, PHY_CSR3, reg);

      /*
       * Wait until the BBP becomes ready.
       */
      reg = rt73usb_bbp_check(rt2x00dev);
      if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
            ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
            *value = 0xff;
            return;
      }

      *value = rt2x00_get_field32(reg, PHY_CSR3_VALUE);
}

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

      if (!word)
            return;

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt73usb_register_read(rt2x00dev, PHY_CSR4, &reg);
            if (!rt2x00_get_field32(reg, PHY_CSR4_BUSY))
                  goto rf_write;
            udelay(REGISTER_BUSY_DELAY);
      }

      ERROR(rt2x00dev, "PHY_CSR4 register busy. Write failed.\n");
      return;

rf_write:
      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->chip, RF5225) ||
                           rt2x00_rf(&rt2x00dev->chip, RF2527)));
      rt2x00_set_field32(&reg, PHY_CSR4_IF_SELECT, 0);
      rt2x00_set_field32(&reg, PHY_CSR4_BUSY, 1);

      rt73usb_register_write(rt2x00dev, PHY_CSR4, reg);
      rt2x00_rf_write(rt2x00dev, word, value);
}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
#define CSR_OFFSET(__word)    ( CSR_REG_BASE + ((__word) * sizeof(u32)) )

static void rt73usb_read_csr(const struct rt2x00_dev *rt2x00dev,
                       const unsigned int word, u32 *data)
{
      rt73usb_register_read(rt2x00dev, CSR_OFFSET(word), data);
}

static void rt73usb_write_csr(const struct rt2x00_dev *rt2x00dev,
                        const unsigned int word, u32 data)
{
      rt73usb_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt73usb_rt2x00debug = {
      .owner      = THIS_MODULE,
      .csr  = {
            .read       = rt73usb_read_csr,
            .write            = rt73usb_write_csr,
            .word_size  = sizeof(u32),
            .word_count = CSR_REG_SIZE / sizeof(u32),
      },
      .eeprom     = {
            .read       = rt2x00_eeprom_read,
            .write            = rt2x00_eeprom_write,
            .word_size  = sizeof(u16),
            .word_count = EEPROM_SIZE / sizeof(u16),
      },
      .bbp  = {
            .read       = rt73usb_bbp_read,
            .write            = rt73usb_bbp_write,
            .word_size  = sizeof(u8),
            .word_count = BBP_SIZE / sizeof(u8),
      },
      .rf   = {
            .read       = rt2x00_rf_read,
            .write            = rt73usb_rf_write,
            .word_size  = sizeof(u32),
            .word_count = RF_SIZE / sizeof(u32),
      },
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

/*
 * Configuration handlers.
 */
static void rt73usb_config_mac_addr(struct rt2x00_dev *rt2x00dev, __le32 *mac)
{
      u32 tmp;

      tmp = le32_to_cpu(mac[1]);
      rt2x00_set_field32(&tmp, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
      mac[1] = cpu_to_le32(tmp);

      rt73usb_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
                            (2 * sizeof(__le32)));
}

static void rt73usb_config_bssid(struct rt2x00_dev *rt2x00dev, __le32 *bssid)
{
      u32 tmp;

      tmp = le32_to_cpu(bssid[1]);
      rt2x00_set_field32(&tmp, MAC_CSR5_BSS_ID_MASK, 3);
      bssid[1] = cpu_to_le32(tmp);

      rt73usb_register_multiwrite(rt2x00dev, MAC_CSR4, bssid,
                            (2 * sizeof(__le32)));
}

static void rt73usb_config_type(struct rt2x00_dev *rt2x00dev, const int type,
                        const int tsf_sync)
{
      u32 reg;

      /*
       * Clear current synchronisation setup.
       * 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.
       */
      rt73usb_register_write(rt2x00dev, TXRX_CSR9, 0);
      rt73usb_register_write(rt2x00dev, HW_BEACON_BASE0, 0);
      rt73usb_register_write(rt2x00dev, HW_BEACON_BASE1, 0);
      rt73usb_register_write(rt2x00dev, HW_BEACON_BASE2, 0);
      rt73usb_register_write(rt2x00dev, HW_BEACON_BASE3, 0);

      /*
       * Enable synchronisation.
       */
      rt73usb_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, 0);
      rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, tsf_sync);
      rt73usb_register_write(rt2x00dev, TXRX_CSR9, reg);
}

static void rt73usb_config_preamble(struct rt2x00_dev *rt2x00dev,
                              const int short_preamble,
                              const int ack_timeout,
                              const int ack_consume_time)
{
      u32 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;
      }

      rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, ack_timeout);
      rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

      rt73usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_PREAMBLE,
                     !!short_preamble);
      rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);
}

static void rt73usb_config_phymode(struct rt2x00_dev *rt2x00dev,
                           const int basic_rate_mask)
{
      rt73usb_register_write(rt2x00dev, TXRX_CSR5, basic_rate_mask);
}

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->chip, RF5225) ||
              rt2x00_rf(&rt2x00dev->chip, 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_antenna_5x(struct rt2x00_dev *rt2x00dev,
                              const int antenna_tx,
                              const int antenna_rx)
{
      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);

      switch (antenna_rx) {
      case ANTENNA_SW_DIVERSITY:
      case ANTENNA_HW_DIVERSITY:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
            rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
                          !!(rt2x00dev->curr_hwmode != HWMODE_A));
            break;
      case ANTENNA_A:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
            rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);

            if (rt2x00dev->curr_hwmode == HWMODE_A)
                  rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
            else
                  rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
            break;
      case ANTENNA_B:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
            rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);

            if (rt2x00dev->curr_hwmode == HWMODE_A)
                  rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
            else
                  rt2x00_set_field8(&r77, BBP_R77_PAIR, 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,
                              const int antenna_tx,
                              const int antenna_rx)
{
      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,
                    !test_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags));

      switch (antenna_rx) {
      case ANTENNA_SW_DIVERSITY:
      case ANTENNA_HW_DIVERSITY:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
            break;
      case ANTENNA_A:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
            rt2x00_set_field8(&r77, BBP_R77_PAIR, 3);
            break;
      case ANTENNA_B:
            rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
            rt2x00_set_field8(&r77, BBP_R77_PAIR, 0);
            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_antenna(struct rt2x00_dev *rt2x00dev,
                           const int antenna_tx, const int antenna_rx)
{
      const struct antenna_sel *sel;
      unsigned int lna;
      unsigned int i;
      u32 reg;

      rt73usb_register_read(rt2x00dev, PHY_CSR0, &reg);

      if (rt2x00dev->curr_hwmode == HWMODE_A) {
            sel = antenna_sel_a;
            lna = test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags);

            rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_BG, 0);
            rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_A, 1);
      } else {
            sel = antenna_sel_bg;
            lna = test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags);

            rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_BG, 1);
            rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_A, 0);
      }

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

      rt73usb_register_write(rt2x00dev, PHY_CSR0, reg);

      if (rt2x00_rf(&rt2x00dev->chip, RF5226) ||
          rt2x00_rf(&rt2x00dev->chip, RF5225))
            rt73usb_config_antenna_5x(rt2x00dev, antenna_tx, antenna_rx);
      else if (rt2x00_rf(&rt2x00dev->chip, RF2528) ||
             rt2x00_rf(&rt2x00dev->chip, RF2527))
            rt73usb_config_antenna_2x(rt2x00dev, antenna_tx, antenna_rx);
}

static void rt73usb_config_duration(struct rt2x00_dev *rt2x00dev,
                            struct rt2x00lib_conf *libconf)
{
      u32 reg;

      rt73usb_register_read(rt2x00dev, MAC_CSR9, &reg);
      rt2x00_set_field32(&reg, MAC_CSR9_SLOT_TIME, libconf->slot_time);
      rt73usb_register_write(rt2x00dev, MAC_CSR9, reg);

      rt73usb_register_read(rt2x00dev, MAC_CSR8, &reg);
      rt2x00_set_field32(&reg, MAC_CSR8_SIFS, libconf->sifs);
      rt2x00_set_field32(&reg, MAC_CSR8_SIFS_AFTER_RX_OFDM, 3);
      rt2x00_set_field32(&reg, MAC_CSR8_EIFS, libconf->eifs);
      rt73usb_register_write(rt2x00dev, MAC_CSR8, reg);

      rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
      rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

      rt73usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_ENABLE, 1);
      rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);

      rt73usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_INTERVAL,
                     libconf->conf->beacon_int * 16);
      rt73usb_register_write(rt2x00dev, TXRX_CSR9, reg);
}

static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
                     const unsigned int flags,
                     struct rt2x00lib_conf *libconf)
{
      if (flags & CONFIG_UPDATE_PHYMODE)
            rt73usb_config_phymode(rt2x00dev, libconf->basic_rates);
      if (flags & CONFIG_UPDATE_CHANNEL)
            rt73usb_config_channel(rt2x00dev, &libconf->rf,
                               libconf->conf->power_level);
      if ((flags & CONFIG_UPDATE_TXPOWER) && !(flags & CONFIG_UPDATE_CHANNEL))
            rt73usb_config_txpower(rt2x00dev, libconf->conf->power_level);
      if (flags & CONFIG_UPDATE_ANTENNA)
            rt73usb_config_antenna(rt2x00dev, libconf->conf->antenna_sel_tx,
                               libconf->conf->antenna_sel_rx);
      if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
            rt73usb_config_duration(rt2x00dev, libconf);
}

/*
 * LED functions.
 */
static void rt73usb_enable_led(struct rt2x00_dev *rt2x00dev)
{
      u32 reg;

      rt73usb_register_read(rt2x00dev, MAC_CSR14, &reg);
      rt2x00_set_field32(&reg, MAC_CSR14_ON_PERIOD, 70);
      rt2x00_set_field32(&reg, MAC_CSR14_OFF_PERIOD, 30);
      rt73usb_register_write(rt2x00dev, MAC_CSR14, reg);

      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_RADIO_STATUS, 1);
      if (rt2x00dev->rx_status.phymode == MODE_IEEE80211A)
            rt2x00_set_field16(&rt2x00dev->led_reg,
                           MCU_LEDCS_LINK_A_STATUS, 1);
      else
            rt2x00_set_field16(&rt2x00dev->led_reg,
                           MCU_LEDCS_LINK_BG_STATUS, 1);

      rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, 0x0000,
                            rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

static void rt73usb_disable_led(struct rt2x00_dev *rt2x00dev)
{
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_RADIO_STATUS, 0);
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_BG_STATUS, 0);
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_A_STATUS, 0);

      rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, 0x0000,
                            rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

static void rt73usb_activity_led(struct rt2x00_dev *rt2x00dev, int rssi)
{
      u32 led;

      if (rt2x00dev->led_mode != LED_MODE_SIGNAL_STRENGTH)
            return;

      /*
       * Led handling requires a positive value for the rssi,
       * to do that correctly we need to add the correction.
       */
      rssi += rt2x00dev->rssi_offset;

      if (rssi <= 30)
            led = 0;
      else if (rssi <= 39)
            led = 1;
      else if (rssi <= 49)
            led = 2;
      else if (rssi <= 53)
            led = 3;
      else if (rssi <= 63)
            led = 4;
      else
            led = 5;

      rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, led,
                            rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

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

      /*
       * Update FCS error count from register.
       */
      rt73usb_register_read(rt2x00dev, STA_CSR0, &reg);
      rt2x00dev->link.rx_failed = rt2x00_get_field32(reg, STA_CSR0_FCS_ERROR);

      /*
       * Update False CCA count from register.
       */
      rt73usb_register_read(rt2x00dev, STA_CSR1, &reg);
      reg = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
      rt2x00dev->link.false_cca =
          rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
}

static void rt73usb_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
      rt73usb_bbp_write(rt2x00dev, 17, 0x20);
      rt2x00dev->link.vgc_level = 0x20;
}

static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
{
      int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
      u8 r17;
      u8 up_bound;
      u8 low_bound;

      /*
       * Update Led strength
       */
      rt73usb_activity_led(rt2x00dev, rssi);

      rt73usb_bbp_read(rt2x00dev, 17, &r17);

      /*
       * Determine r17 bounds.
       */
      if (rt2x00dev->rx_status.phymode == MODE_IEEE80211A) {
            low_bound = 0x28;
            up_bound = 0x48;

            if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags)) {
                  low_bound += 0x10;
                  up_bound += 0x10;
            }
      } else {
            if (rssi > -82) {
                  low_bound = 0x1c;
                  up_bound = 0x40;
            } else if (rssi > -84) {
                  low_bound = 0x1c;
                  up_bound = 0x20;
            } else {
                  low_bound = 0x1c;
                  up_bound = 0x1c;
            }

            if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags)) {
                  low_bound += 0x14;
                  up_bound += 0x10;
            }
      }

      /*
       * Special big-R17 for very short distance
       */
      if (rssi > -35) {
            if (r17 != 0x60)
                  rt73usb_bbp_write(rt2x00dev, 17, 0x60);
            return;
      }

      /*
       * Special big-R17 for short distance
       */
      if (rssi >= -58) {
            if (r17 != up_bound)
                  rt73usb_bbp_write(rt2x00dev, 17, up_bound);
            return;
      }

      /*
       * Special big-R17 for middle-short distance
       */
      if (rssi >= -66) {
            low_bound += 0x10;
            if (r17 != low_bound)
                  rt73usb_bbp_write(rt2x00dev, 17, low_bound);
            return;
      }

      /*
       * Special mid-R17 for middle distance
       */
      if (rssi >= -74) {
            if (r17 != (low_bound + 0x10))
                  rt73usb_bbp_write(rt2x00dev, 17, 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 - rssi);
      if (low_bound > up_bound)
            up_bound = low_bound;

      if (r17 > up_bound) {
            rt73usb_bbp_write(rt2x00dev, 17, up_bound);
            return;
      }

      /*
       * r17 does not yet exceed upper limit, continue and base
       * the r17 tuning on the false CCA count.
       */
      if (rt2x00dev->link.false_cca > 512 && r17 < up_bound) {
            r17 += 4;
            if (r17 > up_bound)
                  r17 = up_bound;
            rt73usb_bbp_write(rt2x00dev, 17, r17);
      } else if (rt2x00dev->link.false_cca < 100 && r17 > low_bound) {
            r17 -= 4;
            if (r17 < low_bound)
                  r17 = low_bound;
            rt73usb_bbp_write(rt2x00dev, 17, r17);
      }
}

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

/*
 * Initialization functions.
 */
static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
                         const size_t len)
{
      unsigned int i;
      int status;
      u32 reg;
      char *ptr = data;
      char *cache;
      int buflen;
      int timeout;

      /*
       * Wait for stable hardware.
       */
      for (i = 0; i < 100; i++) {
            rt73usb_register_read(rt2x00dev, MAC_CSR0, &reg);
            if (reg)
                  break;
            msleep(1);
      }

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

      /*
       * Write firmware to device.
       * We setup a seperate cache for this action,
       * since we are going to write larger chunks of data
       * then normally used cache size.
       */
      cache = kmalloc(CSR_CACHE_SIZE_FIRMWARE, GFP_KERNEL);
      if (!cache) {
            ERROR(rt2x00dev, "Failed to allocate firmware cache.\n");
            return -ENOMEM;
      }

      for (i = 0; i < len; i += CSR_CACHE_SIZE_FIRMWARE) {
            buflen = min_t(int, len - i, CSR_CACHE_SIZE_FIRMWARE);
            timeout = REGISTER_TIMEOUT * (buflen / sizeof(u32));

            memcpy(cache, ptr, buflen);

            rt2x00usb_vendor_request(rt2x00dev, USB_MULTI_WRITE,
                               USB_VENDOR_REQUEST_OUT,
                               FIRMWARE_IMAGE_BASE + i, 0x0000,
                               cache, buflen, timeout);

            ptr += buflen;
      }

      kfree(cache);

      /*
       * 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,
                                   0x0000, USB_MODE_FIRMWARE,
                                   REGISTER_TIMEOUT_FIRMWARE);
      if (status < 0) {
            ERROR(rt2x00dev, "Failed to write Firmware to device.\n");
            return status;
      }

      rt73usb_disable_led(rt2x00dev);

      return 0;
}

static int rt73usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
      u32 reg;

      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR1, reg);

      /*
       * CCK TXD BBP registers
       */
      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR2, reg);

      /*
       * OFDM TXD BBP registers
       */
      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR3, reg);

      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR7, reg);

      rt73usb_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);
      rt73usb_register_write(rt2x00dev, TXRX_CSR8, reg);

      rt73usb_register_write(rt2x00dev, TXRX_CSR15, 0x0000000f);

      rt73usb_register_read(rt2x00dev, MAC_CSR6, &reg);
      rt2x00_set_field32(&reg, MAC_CSR6_MAX_FRAME_UNIT, 0xfff);
      rt73usb_register_write(rt2x00dev, MAC_CSR6, reg);

      rt73usb_register_write(rt2x00dev, MAC_CSR10, 0x00000718);

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

      rt73usb_register_write(rt2x00dev, MAC_CSR13, 0x00007f00);

      /*
       * Invalidate all Shared Keys (SEC_CSR0),
       * and clear the Shared key Cipher algorithms (SEC_CSR1 & SEC_CSR5)
       */
      rt73usb_register_write(rt2x00dev, SEC_CSR0, 0x00000000);
      rt73usb_register_write(rt2x00dev, SEC_CSR1, 0x00000000);
      rt73usb_register_write(rt2x00dev, SEC_CSR5, 0x00000000);

      reg = 0x000023b0;
      if (rt2x00_rf(&rt2x00dev->chip, RF5225) ||
          rt2x00_rf(&rt2x00dev->chip, RF2527))
            rt2x00_set_field32(&reg, PHY_CSR1_RF_RPI, 1);
      rt73usb_register_write(rt2x00dev, PHY_CSR1, reg);

      rt73usb_register_write(rt2x00dev, PHY_CSR5, 0x00040a06);
      rt73usb_register_write(rt2x00dev, PHY_CSR6, 0x00080606);
      rt73usb_register_write(rt2x00dev, PHY_CSR7, 0x00000408);

      rt73usb_register_read(rt2x00dev, AC_TXOP_CSR0, &reg);
      rt2x00_set_field32(&reg, AC_TXOP_CSR0_AC0_TX_OP, 0);
      rt2x00_set_field32(&reg, AC_TXOP_CSR0_AC1_TX_OP, 0);
      rt73usb_register_write(rt2x00dev, AC_TXOP_CSR0, reg);

      rt73usb_register_read(rt2x00dev, AC_TXOP_CSR1, &reg);
      rt2x00_set_field32(&reg, AC_TXOP_CSR1_AC2_TX_OP, 192);
      rt2x00_set_field32(&reg, AC_TXOP_CSR1_AC3_TX_OP, 48);
      rt73usb_register_write(rt2x00dev, AC_TXOP_CSR1, reg);

      rt73usb_register_read(rt2x00dev, MAC_CSR9, &reg);
      rt2x00_set_field32(&reg, MAC_CSR9_CW_SELECT, 0);
      rt73usb_register_write(rt2x00dev, MAC_CSR9, reg);

      /*
       * We must clear the error counters.
       * These registers are cleared on read,
       * so we may pass a useless variable to store the value.
       */
      rt73usb_register_read(rt2x00dev, STA_CSR0, &reg);
      rt73usb_register_read(rt2x00dev, STA_CSR1, &reg);
      rt73usb_register_read(rt2x00dev, STA_CSR2, &reg);

      /*
       * Reset MAC and BBP registers.
       */
      rt73usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 1);
      rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 1);
      rt73usb_register_write(rt2x00dev, MAC_CSR1, reg);

      rt73usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field32(&reg, MAC_CSR1_SOFT_RESET, 0);
      rt2x00_set_field32(&reg, MAC_CSR1_BBP_RESET, 0);
      rt73usb_register_write(rt2x00dev, MAC_CSR1, reg);

      rt73usb_register_read(rt2x00dev, MAC_CSR1, &reg);
      rt2x00_set_field32(&reg, MAC_CSR1_HOST_READY, 1);
      rt73usb_register_write(rt2x00dev, MAC_CSR1, reg);

      return 0;
}

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

      for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
            rt73usb_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:
      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);

      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);
                  rt73usb_bbp_write(rt2x00dev, reg_id, value);
            }
      }
      DEBUG(rt2x00dev, "...End initialization from EEPROM.\n");

      return 0;
}

/*
 * Device state switch handlers.
 */
static void rt73usb_toggle_rx(struct rt2x00_dev *rt2x00dev,
                        enum dev_state state)
{
      u32 reg;

      rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX,
                     state == STATE_RADIO_RX_OFF);
      rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);
}

static int rt73usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
      /*
       * Initialize all registers.
       */
      if (rt73usb_init_registers(rt2x00dev) ||
          rt73usb_init_bbp(rt2x00dev)) {
            ERROR(rt2x00dev, "Register initialization failed.\n");
            return -EIO;
      }

      rt2x00usb_enable_radio(rt2x00dev);

      /*
       * Enable LED
       */
      rt73usb_enable_led(rt2x00dev);

      return 0;
}

static void rt73usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
      /*
       * Disable LED
       */
      rt73usb_disable_led(rt2x00dev);

      rt73usb_register_write(rt2x00dev, MAC_CSR10, 0x00001818);

      /*
       * Disable synchronisation.
       */
      rt73usb_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;
      unsigned int i;
      char put_to_sleep;
      char current_state;

      put_to_sleep = (state != STATE_AWAKE);

      rt73usb_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);
      rt73usb_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++) {
            rt73usb_register_read(rt2x00dev, MAC_CSR12, &reg);
            current_state =
                rt2x00_get_field32(reg, MAC_CSR12_BBP_CURRENT_STATE);
            if (current_state == !put_to_sleep)
                  return 0;
            msleep(10);
      }

      NOTICE(rt2x00dev, "Device failed to enter state %d, "
             "current device state %d.\n", !put_to_sleep, current_state);

      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_RX_ON:
      case STATE_RADIO_RX_OFF:
            rt73usb_toggle_rx(rt2x00dev, state);
            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;
      }

      return retval;
}

/*
 * TX descriptor initialization
 */
static void rt73usb_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_HOST_Q_ID, desc->queue);
      rt2x00_set_field32(&word, TXD_W1_AIFSN, desc->aifs);
      rt2x00_set_field32(&word, TXD_W1_CWMIN, desc->cw_min);
      rt2x00_set_field32(&word, TXD_W1_CWMAX, desc->cw_max);
      rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, IEEE80211_HEADER);
      rt2x00_set_field32(&word, TXD_W1_HW_SEQUENCE, 1);
      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, 5, &word);
      rt2x00_set_field32(&word, TXD_W5_TX_POWER,
                     TXPOWER_TO_DEV(control->power_level));
      rt2x00_set_field32(&word, TXD_W5_WAITING_DMA_DONE_INT, 1);
      rt2x00_desc_write(txd, 5, word);

      rt2x00_desc_read(txd, 0, &word);
      rt2x00_set_field32(&word, TXD_W0_BURST,
                     test_bit(ENTRY_TXD_BURST, &desc->flags));
      rt2x00_set_field32(&word, TXD_W0_VALID, 1);
      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_IFS, desc->ifs);
      rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
                     !!(control->flags &
                        IEEE80211_TXCTL_LONG_RETRY_LIMIT));
      rt2x00_set_field32(&word, TXD_W0_TKIP_MIC, 0);
      rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, length);
      rt2x00_set_field32(&word, TXD_W0_BURST2,
                     test_bit(ENTRY_TXD_BURST, &desc->flags));
      rt2x00_set_field32(&word, TXD_W0_CIPHER_ALG, CIPHER_NONE);
      rt2x00_desc_write(txd, 0, word);
}

static int rt73usb_get_tx_data_len(struct rt2x00_dev *rt2x00dev,
                           struct sk_buff *skb)
{
      int length;

      /*
       * The length _must_ be a multiple of 4,
       * but it must _not_ be a multiple of the USB packet size.
       */
      length = roundup(skb->len, 4);
      length += (4 * !(length % rt2x00dev->usb_maxpacket));

      return length;
}

/*
 * TX data initialization
 */
static void rt73usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
                          unsigned int queue)
{
      u32 reg;

      if (queue != IEEE80211_TX_QUEUE_BEACON)
            return;

      /*
       * For Wi-Fi faily generated beacons between participating stations.
       * Set TBTT phase adaptive adjustment step to 8us (default 16us)
       */
      rt73usb_register_write(rt2x00dev, TXRX_CSR10, 0x00001008);

      rt73usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
      if (!rt2x00_get_field32(reg, TXRX_CSR9_BEACON_GEN)) {
            rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 1);
            rt73usb_register_write(rt2x00dev, TXRX_CSR9, reg);
      }
}

/*
 * RX control handlers
 */
static int rt73usb_agc_to_rssi(struct rt2x00_dev *rt2x00dev, int rxd_w1)
{
      u16 eeprom;
      u8 offset;
      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->rx_status.phymode == MODE_IEEE80211A) {
            if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags)) {
                  if (lna == 3 || lna == 2)
                        offset += 10;
            } else {
                  if (lna == 3)
                        offset += 6;
                  else if (lna == 2)
                        offset += 8;
            }

            rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
            offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
      } else {
            if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags))
                  offset += 14;

            rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
            offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
      }

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

static void rt73usb_fill_rxdone(struct data_entry *entry,
                          struct rxdata_entry_desc *desc)
{
      struct data_desc *rxd = (struct data_desc *)entry->skb->data;
      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;

      /*
       * Obtain the status about this packet.
       */
      desc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
      desc->rssi = rt73usb_agc_to_rssi(entry->ring->rt2x00dev, word1);
      desc->ofdm = rt2x00_get_field32(word0, RXD_W0_OFDM);
      desc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);

      /*
       * Pull the skb to clear the descriptor area.
       */
      skb_pull(entry->skb, entry->ring->desc_size);

      return;
}

/*
 * 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)) {
            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, 2);
            rt2x00_set_field16(&word, EEPROM_ANTENNA_RX_DEFAULT, 2);
            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);
            EEPROM(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);
            EEPROM(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);
            EEPROM(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);
            EEPROM(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);
            EEPROM(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);
            EEPROM(rt2x00dev, "RSSI OFFSET BG: 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);
      rt73usb_register_read(rt2x00dev, MAC_CSR0, &reg);
      rt2x00_set_chip(rt2x00dev, RT2571, value, reg);

      if (!rt2x00_check_rev(&rt2x00dev->chip, 0x25730)) {
            ERROR(rt2x00dev, "Invalid RT chipset detected.\n");
            return -ENODEV;
      }

      if (!rt2x00_rf(&rt2x00dev->chip, RF5226) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2528) &&
          !rt2x00_rf(&rt2x00dev->chip, RF5225) &&
          !rt2x00_rf(&rt2x00dev->chip, RF2527)) {
            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);

      /*
       * Read the Frame type.
       */
      if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_FRAME_TYPE))
            __set_bit(CONFIG_FRAME_TYPE, &rt2x00dev->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(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags);
            __set_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags);
      }

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

      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LED_MODE,
                     rt2x00dev->led_mode);
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_GPIO_0,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_GPIO_0));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_GPIO_1,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_GPIO_1));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_GPIO_2,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_GPIO_2));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_GPIO_3,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_GPIO_3));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_GPIO_4,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_GPIO_4));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_ACT,
                     rt2x00_get_field16(eeprom, EEPROM_LED_POLARITY_ACT));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_READY_BG,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_RDY_G));
      rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_POLARITY_READY_A,
                     rt2x00_get_field16(eeprom,
                                    EEPROM_LED_POLARITY_RDY_A));

      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 void rt73usb_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_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 = 5;

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

      if (rt2x00_rf(&rt2x00dev->chip, RF5225) ||
          rt2x00_rf(&rt2x00dev->chip, RF5226)) {
            spec->num_modes = 3;

            txpower = rt2x00_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_A_START);
            for (i = 0; i < 14; i++)
                  txpower[i] = TXPOWER_FROM_DEV(txpower[i]);

            spec->tx_power_a = txpower;
      }
}

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

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

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

      /*
       * Initialize hw specifications.
       */
      rt73usb_probe_hw_mode(rt2x00dev);

      /*
       * This device requires firmware
       */
      __set_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags);

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

      return 0;
}

/*
 * IEEE80211 stack callback functions.
 */
static void rt73usb_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;
      u32 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.
       */
      rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_CRC,
                     !(*total_flags & FIF_FCSFAIL));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_PHYSICAL,
                     !(*total_flags & FIF_PLCPFAIL));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_CONTROL,
                     !(*total_flags & FIF_CONTROL));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_NOT_TO_ME,
                     !(*total_flags & FIF_PROMISC_IN_BSS));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_TO_DS,
                     !(*total_flags & FIF_PROMISC_IN_BSS));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_VERSION_ERROR, 1);
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_MULTICAST,
                     !(*total_flags & FIF_ALLMULTI));
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_BROADCAST, 0);
      rt2x00_set_field32(&reg, TXRX_CSR0_DROP_ACK_CTS, 1);
      rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);
}

static int rt73usb_set_retry_limit(struct ieee80211_hw *hw,
                           u32 short_retry, u32 long_retry)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;
      u32 reg;

      rt73usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
      rt2x00_set_field32(&reg, TXRX_CSR4_LONG_RETRY_LIMIT, long_retry);
      rt2x00_set_field32(&reg, TXRX_CSR4_SHORT_RETRY_LIMIT, short_retry);
      rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);

      return 0;
}

#if 0
/*
 * Mac80211 demands get_tsf must be atomic.
 * This is not possible for rt73usb since all register access
 * functions require sleeping. Untill mac80211 no longer needs
 * get_tsf to be atomic, this function should be disabled.
 */
static u64 rt73usb_get_tsf(struct ieee80211_hw *hw)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;
      u64 tsf;
      u32 reg;

      rt73usb_register_read(rt2x00dev, TXRX_CSR13, &reg);
      tsf = (u64) rt2x00_get_field32(reg, TXRX_CSR13_HIGH_TSFTIMER) << 32;
      rt73usb_register_read(rt2x00dev, TXRX_CSR12, &reg);
      tsf |= rt2x00_get_field32(reg, TXRX_CSR12_LOW_TSFTIMER);

      return tsf;
}
#else
#define rt73usb_get_tsf NULL
#endif

static void rt73usb_reset_tsf(struct ieee80211_hw *hw)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;

      rt73usb_register_write(rt2x00dev, TXRX_CSR12, 0);
      rt73usb_register_write(rt2x00dev, TXRX_CSR13, 0);
}

static int rt73usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
                    struct ieee80211_tx_control *control)
{
      struct rt2x00_dev *rt2x00dev = hw->priv;
      int timeout;

      /*
       * 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;

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

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

      /*
       * Write entire beacon with descriptor to register,
       * and kick the beacon generator.
       */
      timeout = REGISTER_TIMEOUT * (skb->len / sizeof(u32));
      rt2x00usb_vendor_request(rt2x00dev, USB_MULTI_WRITE,
                         USB_VENDOR_REQUEST_OUT,
                         HW_BEACON_BASE0, 0x0000,
                         skb->data, skb->len, timeout);
      rt73usb_kick_tx_queue(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);

      return 0;
}

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,
      .config_interface = rt2x00mac_config_interface,
      .configure_filter = rt73usb_configure_filter,
      .get_stats        = rt2x00mac_get_stats,
      .set_retry_limit  = rt73usb_set_retry_limit,
      .erp_ie_changed         = rt2x00mac_erp_ie_changed,
      .conf_tx          = rt2x00mac_conf_tx,
      .get_tx_stats           = rt2x00mac_get_tx_stats,
      .get_tsf          = rt73usb_get_tsf,
      .reset_tsf        = rt73usb_reset_tsf,
      .beacon_update          = rt73usb_beacon_update,
};

static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
      .probe_hw         = rt73usb_probe_hw,
      .get_firmware_name      = rt73usb_get_firmware_name,
      .load_firmware          = rt73usb_load_firmware,
      .initialize       = rt2x00usb_initialize,
      .uninitialize           = rt2x00usb_uninitialize,
      .set_device_state = rt73usb_set_device_state,
      .link_stats       = rt73usb_link_stats,
      .reset_tuner            = rt73usb_reset_tuner,
      .link_tuner       = rt73usb_link_tuner,
      .write_tx_desc          = rt73usb_write_tx_desc,
      .write_tx_data          = rt2x00usb_write_tx_data,
      .get_tx_data_len  = rt73usb_get_tx_data_len,
      .kick_tx_queue          = rt73usb_kick_tx_queue,
      .fill_rxdone            = rt73usb_fill_rxdone,
      .config_mac_addr  = rt73usb_config_mac_addr,
      .config_bssid           = rt73usb_config_bssid,
      .config_type            = rt73usb_config_type,
      .config_preamble  = rt73usb_config_preamble,
      .config                 = rt73usb_config,
};

static const struct rt2x00_ops rt73usb_ops = {
      .name       = DRV_NAME,
      .rxd_size   = RXD_DESC_SIZE,
      .txd_size   = TXD_DESC_SIZE,
      .eeprom_size      = EEPROM_SIZE,
      .rf_size    = RF_SIZE,
      .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, 0xb21d), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Askey */
      { USB_DEVICE(0x1690, 0x0722), USB_DEVICE_DATA(&rt73usb_ops) },
      /* ASUS */
      { USB_DEVICE(0x0b05, 0x1723), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x0b05, 0x1724), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Belkin */
      { USB_DEVICE(0x050d, 0x7050), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x050d, 0x705a), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x050d, 0x905b), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x050d, 0x905c), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Billionton */
      { USB_DEVICE(0x1631, 0xc019), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Buffalo */
      { USB_DEVICE(0x0411, 0x00f4), USB_DEVICE_DATA(&rt73usb_ops) },
      /* CNet */
      { USB_DEVICE(0x1371, 0x9022), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x1371, 0x9032), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Conceptronic */
      { USB_DEVICE(0x14b2, 0x3c22), USB_DEVICE_DATA(&rt73usb_ops) },
      /* D-Link */
      { USB_DEVICE(0x07d1, 0x3c03), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x07d1, 0x3c04), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Gemtek */
      { USB_DEVICE(0x15a9, 0x0004), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Gigabyte */
      { USB_DEVICE(0x1044, 0x8008), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x1044, 0x800a), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Huawei-3Com */
      { USB_DEVICE(0x1472, 0x0009), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Hercules */
      { USB_DEVICE(0x06f8, 0xe010), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x06f8, 0xe020), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Linksys */
      { USB_DEVICE(0x13b1, 0x0020), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x13b1, 0x0023), USB_DEVICE_DATA(&rt73usb_ops) },
      /* MSI */
      { USB_DEVICE(0x0db0, 0x6877), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x0db0, 0x6874), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x0db0, 0xa861), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x0db0, 0xa874), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Ralink */
      { USB_DEVICE(0x148f, 0x2573), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x148f, 0x2671), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Qcom */
      { USB_DEVICE(0x18e8, 0x6196), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x18e8, 0x6229), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x18e8, 0x6238), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Senao */
      { USB_DEVICE(0x1740, 0x7100), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Sitecom */
      { USB_DEVICE(0x0df6, 0x9712), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x0df6, 0x90ac), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Surecom */
      { USB_DEVICE(0x0769, 0x31f3), USB_DEVICE_DATA(&rt73usb_ops) },
      /* Planex */
      { USB_DEVICE(0x2019, 0xab01), USB_DEVICE_DATA(&rt73usb_ops) },
      { USB_DEVICE(0x2019, 0xab50), USB_DEVICE_DATA(&rt73usb_ops) },
      { 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 struct usb_driver rt73usb_driver = {
      .name       = DRV_NAME,
      .id_table   = rt73usb_device_table,
      .probe            = rt2x00usb_probe,
      .disconnect = rt2x00usb_disconnect,
      .suspend    = rt2x00usb_suspend,
      .resume           = rt2x00usb_resume,
};

static int __init rt73usb_init(void)
{
      return usb_register(&rt73usb_driver);
}

static void __exit rt73usb_exit(void)
{
      usb_deregister(&rt73usb_driver);
}

module_init(rt73usb_init);
module_exit(rt73usb_exit);

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