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p54common.c

/*
 * Common code for mac80211 Prism54 drivers
 *
 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
 * Copyright (c) 2007, Christian Lamparter <chunkeey@web.de>
 *
 * Based on the islsm (softmac prism54) driver, which is:
 * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>

#include <net/mac80211.h>

#include "p54.h"
#include "p54common.h"

MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
MODULE_DESCRIPTION("Softmac Prism54 common code");
MODULE_LICENSE("GPL");
MODULE_ALIAS("prism54common");

void p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw)
{
      struct p54_common *priv = dev->priv;
      struct bootrec_exp_if *exp_if;
      struct bootrec *bootrec;
      u32 *data = (u32 *)fw->data;
      u32 *end_data = (u32 *)fw->data + (fw->size >> 2);
      u8 *fw_version = NULL;
      size_t len;
      int i;

      if (priv->rx_start)
            return;

      while (data < end_data && *data)
            data++;

      while (data < end_data && !*data)
            data++;

      bootrec = (struct bootrec *) data;

      while (bootrec->data <= end_data &&
             (bootrec->data + (len = le32_to_cpu(bootrec->len))) <= end_data) {
            u32 code = le32_to_cpu(bootrec->code);
            switch (code) {
            case BR_CODE_COMPONENT_ID:
                  switch (be32_to_cpu(*bootrec->data)) {
                  case FW_FMAC:
                        printk(KERN_INFO "p54: FreeMAC firmware\n");
                        break;
                  case FW_LM20:
                        printk(KERN_INFO "p54: LM20 firmware\n");
                        break;
                  case FW_LM86:
                        printk(KERN_INFO "p54: LM86 firmware\n");
                        break;
                  case FW_LM87:
                        printk(KERN_INFO "p54: LM87 firmware - not supported yet!\n");
                        break;
                  default:
                        printk(KERN_INFO "p54: unknown firmware\n");
                        break;
                  }
                  break;
            case BR_CODE_COMPONENT_VERSION:
                  /* 24 bytes should be enough for all firmwares */
                  if (strnlen((unsigned char*)bootrec->data, 24) < 24)
                        fw_version = (unsigned char*)bootrec->data;
                  break;
            case BR_CODE_DESCR:
                  priv->rx_start = le32_to_cpu(bootrec->data[1]);
                  /* FIXME add sanity checking */
                  priv->rx_end = le32_to_cpu(bootrec->data[2]) - 0x3500;
                  break;
            case BR_CODE_EXPOSED_IF:
                  exp_if = (struct bootrec_exp_if *) bootrec->data;
                  for (i = 0; i < (len * sizeof(*exp_if) / 4); i++)
                        if (exp_if[i].if_id == 0x1a)
                              priv->fw_var = le16_to_cpu(exp_if[i].variant);
                  break;
            case BR_CODE_DEPENDENT_IF:
                  break;
            case BR_CODE_END_OF_BRA:
            case LEGACY_BR_CODE_END_OF_BRA:
                  end_data = NULL;
                  break;
            default:
                  break;
            }
            bootrec = (struct bootrec *)&bootrec->data[len];
      }

      if (fw_version)
            printk(KERN_INFO "p54: FW rev %s - Softmac protocol %x.%x\n",
                  fw_version, priv->fw_var >> 8, priv->fw_var & 0xff);

      if (priv->fw_var >= 0x300) {
            /* Firmware supports QoS, use it! */
            priv->tx_stats.data[0].limit = 3;
            priv->tx_stats.data[1].limit = 4;
            priv->tx_stats.data[2].limit = 3;
            priv->tx_stats.data[3].limit = 1;
            dev->queues = 4;
      }
}
EXPORT_SYMBOL_GPL(p54_parse_firmware);

static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev,
                            struct pda_pa_curve_data *curve_data)
{
      struct p54_common *priv = dev->priv;
      struct pda_pa_curve_data_sample_rev1 *rev1;
      struct pda_pa_curve_data_sample_rev0 *rev0;
      size_t cd_len = sizeof(*curve_data) +
            (curve_data->points_per_channel*sizeof(*rev1) + 2) *
             curve_data->channels;
      unsigned int i, j;
      void *source, *target;

      priv->curve_data = kmalloc(cd_len, GFP_KERNEL);
      if (!priv->curve_data)
            return -ENOMEM;

      memcpy(priv->curve_data, curve_data, sizeof(*curve_data));
      source = curve_data->data;
      target = priv->curve_data->data;
      for (i = 0; i < curve_data->channels; i++) {
            __le16 *freq = source;
            source += sizeof(__le16);
            *((__le16 *)target) = *freq;
            target += sizeof(__le16);
            for (j = 0; j < curve_data->points_per_channel; j++) {
                  rev1 = target;
                  rev0 = source;

                  rev1->rf_power = rev0->rf_power;
                  rev1->pa_detector = rev0->pa_detector;
                  rev1->data_64qam = rev0->pcv;
                  /* "invent" the points for the other modulations */
#define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y)
                  rev1->data_16qam = SUB(rev0->pcv, 12);
                  rev1->data_qpsk  = SUB(rev1->data_16qam, 12);
                  rev1->data_bpsk  = SUB(rev1->data_qpsk, 12);
                  rev1->data_barker= SUB(rev1->data_bpsk, 14);
#undef SUB
                  target += sizeof(*rev1);
                  source += sizeof(*rev0);
            }
      }

      return 0;
}

int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
{
      struct p54_common *priv = dev->priv;
      struct eeprom_pda_wrap *wrap = NULL;
      struct pda_entry *entry;
      int i = 0;
      unsigned int data_len, entry_len;
      void *tmp;
      int err;

      wrap = (struct eeprom_pda_wrap *) eeprom;
      entry = (void *)wrap->data + wrap->len;
      i += 2;
      i += le16_to_cpu(entry->len)*2;
      while (i < len) {
            entry_len = le16_to_cpu(entry->len);
            data_len = ((entry_len - 1) << 1);
            switch (le16_to_cpu(entry->code)) {
            case PDR_MAC_ADDRESS:
                  SET_IEEE80211_PERM_ADDR(dev, entry->data);
                  break;
            case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
                  if (data_len < 2) {
                        err = -EINVAL;
                        goto err;
                  }

                  if (2 + entry->data[1]*sizeof(*priv->output_limit) > data_len) {
                        err = -EINVAL;
                        goto err;
                  }

                  priv->output_limit = kmalloc(entry->data[1] *
                        sizeof(*priv->output_limit), GFP_KERNEL);

                  if (!priv->output_limit) {
                        err = -ENOMEM;
                        goto err;
                  }

                  memcpy(priv->output_limit, &entry->data[2],
                         entry->data[1]*sizeof(*priv->output_limit));
                  priv->output_limit_len = entry->data[1];
                  break;
            case PDR_PRISM_PA_CAL_CURVE_DATA:
                  if (data_len < sizeof(struct pda_pa_curve_data)) {
                        err = -EINVAL;
                        goto err;
                  }

                  if (((struct pda_pa_curve_data *)entry->data)->cal_method_rev) {
                        priv->curve_data = kmalloc(data_len, GFP_KERNEL);
                        if (!priv->curve_data) {
                              err = -ENOMEM;
                              goto err;
                        }

                        memcpy(priv->curve_data, entry->data, data_len);
                  } else {
                        err = p54_convert_rev0_to_rev1(dev, (struct pda_pa_curve_data *)entry->data);
                        if (err)
                              goto err;
                  }

                  break;
            case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
                  priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
                  if (!priv->iq_autocal) {
                        err = -ENOMEM;
                        goto err;
                  }

                  memcpy(priv->iq_autocal, entry->data, data_len);
                  priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
                  break;
            case PDR_INTERFACE_LIST:
                  tmp = entry->data;
                  while ((u8 *)tmp < entry->data + data_len) {
                        struct bootrec_exp_if *exp_if = tmp;
                        if (le16_to_cpu(exp_if->if_id) == 0xF)
                              priv->rxhw = exp_if->variant & cpu_to_le16(0x07);
                        tmp += sizeof(struct bootrec_exp_if);
                  }
                  break;
            case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
                  priv->version = *(u8 *)(entry->data + 1);
                  break;
            case PDR_END:
                  i = len;
                  break;
            }

            entry = (void *)entry + (entry_len + 1)*2;
            i += 2;
            i += entry_len*2;
      }

      if (!priv->iq_autocal || !priv->output_limit || !priv->curve_data) {
            printk(KERN_ERR "p54: not all required entries found in eeprom!\n");
            err = -EINVAL;
            goto err;
      }

      return 0;

  err:
      if (priv->iq_autocal) {
            kfree(priv->iq_autocal);
            priv->iq_autocal = NULL;
      }

      if (priv->output_limit) {
            kfree(priv->output_limit);
            priv->output_limit = NULL;
      }

      if (priv->curve_data) {
            kfree(priv->curve_data);
            priv->curve_data = NULL;
      }

      printk(KERN_ERR "p54: eeprom parse failed!\n");
      return err;
}
EXPORT_SYMBOL_GPL(p54_parse_eeprom);

void p54_fill_eeprom_readback(struct p54_control_hdr *hdr)
{
      struct p54_eeprom_lm86 *eeprom_hdr;

      hdr->magic1 = cpu_to_le16(0x8000);
      hdr->len = cpu_to_le16(sizeof(*eeprom_hdr) + 0x2000);
      hdr->type = cpu_to_le16(P54_CONTROL_TYPE_EEPROM_READBACK);
      hdr->retry1 = hdr->retry2 = 0;
      eeprom_hdr = (struct p54_eeprom_lm86 *) hdr->data;
      eeprom_hdr->offset = 0x0;
      eeprom_hdr->len = cpu_to_le16(0x2000);
}
EXPORT_SYMBOL_GPL(p54_fill_eeprom_readback);

static void p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb)
{
      struct p54_rx_hdr *hdr = (struct p54_rx_hdr *) skb->data;
      struct ieee80211_rx_status rx_status = {0};
      u16 freq = le16_to_cpu(hdr->freq);

      rx_status.ssi = hdr->rssi;
      rx_status.rate = hdr->rate & 0x1f; /* report short preambles & CCK too */
      rx_status.channel = freq == 2484 ? 14 : (freq - 2407)/5;
      rx_status.freq = freq;
      rx_status.phymode = MODE_IEEE80211G;
      rx_status.antenna = hdr->antenna;
      rx_status.mactime = le64_to_cpu(hdr->timestamp);

      skb_pull(skb, sizeof(*hdr));
      skb_trim(skb, le16_to_cpu(hdr->len));

      ieee80211_rx_irqsafe(dev, skb, &rx_status);
}

static void inline p54_wake_free_queues(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      int i;

      /* ieee80211_start_queues is great if all queues are really empty.
       * But, what if some are full? */

      for (i = 0; i < dev->queues; i++)
            if (priv->tx_stats.data[i].len < priv->tx_stats.data[i].limit)
                  ieee80211_wake_queue(dev, i);
}

static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr = (struct p54_control_hdr *) skb->data;
      struct p54_frame_sent_hdr *payload = (struct p54_frame_sent_hdr *) hdr->data;
      struct sk_buff *entry = (struct sk_buff *) priv->tx_queue.next;
      u32 addr = le32_to_cpu(hdr->req_id) - 0x70;
      struct memrecord *range = NULL;
      u32 freed = 0;
      u32 last_addr = priv->rx_start;

      while (entry != (struct sk_buff *)&priv->tx_queue) {
            range = (struct memrecord *)&entry->cb;
            if (range->start_addr == addr) {
                  struct ieee80211_tx_status status = {{0}};
                  struct p54_control_hdr *entry_hdr;
                  struct p54_tx_control_allocdata *entry_data;
                  int pad = 0;

                  if (entry->next != (struct sk_buff *)&priv->tx_queue)
                        freed = ((struct memrecord *)&entry->next->cb)->start_addr - last_addr;
                  else
                        freed = priv->rx_end - last_addr;

                  last_addr = range->end_addr;
                  __skb_unlink(entry, &priv->tx_queue);
                  if (!range->control) {
                        kfree_skb(entry);
                        break;
                  }
                  memcpy(&status.control, range->control,
                         sizeof(status.control));
                  kfree(range->control);
                  priv->tx_stats.data[status.control.queue].len--;

                  entry_hdr = (struct p54_control_hdr *) entry->data;
                  entry_data = (struct p54_tx_control_allocdata *) entry_hdr->data;
                  if ((entry_hdr->magic1 & cpu_to_le16(0x4000)) != 0)
                        pad = entry_data->align[0];

                  if (!status.control.flags & IEEE80211_TXCTL_NO_ACK) {
                        if (!(payload->status & 0x01))
                              status.flags |= IEEE80211_TX_STATUS_ACK;
                        else
                              status.excessive_retries = 1;
                  }
                  status.retry_count = payload->retries - 1;
                  status.ack_signal = le16_to_cpu(payload->ack_rssi);
                  skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
                  ieee80211_tx_status_irqsafe(dev, entry, &status);
                  break;
            } else
                  last_addr = range->end_addr;
            entry = entry->next;
      }

      if (freed >= IEEE80211_MAX_RTS_THRESHOLD + 0x170 +
          sizeof(struct p54_control_hdr))
            p54_wake_free_queues(dev);
}

static void p54_rx_control(struct ieee80211_hw *dev, struct sk_buff *skb)
{
      struct p54_control_hdr *hdr = (struct p54_control_hdr *) skb->data;

      switch (le16_to_cpu(hdr->type)) {
      case P54_CONTROL_TYPE_TXDONE:
            p54_rx_frame_sent(dev, skb);
            break;
      case P54_CONTROL_TYPE_BBP:
            break;
      default:
            printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
                   wiphy_name(dev->wiphy), le16_to_cpu(hdr->type));
            break;
      }
}

/* returns zero if skb can be reused */
int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
{
      u8 type = le16_to_cpu(*((__le16 *)skb->data)) >> 8;
      switch (type) {
      case 0x00:
      case 0x01:
            p54_rx_data(dev, skb);
            return -1;
      case 0x4d:
            /* TODO: do something better... but then again, I've never seen this happen */
            printk(KERN_ERR "%s: Received fault. Probably need to restart hardware now..\n",
                   wiphy_name(dev->wiphy));
            break;
      case 0x80:
            p54_rx_control(dev, skb);
            break;
      default:
            printk(KERN_ERR "%s: unknown frame RXed (0x%02x)\n",
                   wiphy_name(dev->wiphy), type);
            break;
      }
      return 0;
}
EXPORT_SYMBOL_GPL(p54_rx);

/*
 * So, the firmware is somewhat stupid and doesn't know what places in its
 * memory incoming data should go to. By poking around in the firmware, we
 * can find some unused memory to upload our packets to. However, data that we
 * want the card to TX needs to stay intact until the card has told us that
 * it is done with it. This function finds empty places we can upload to and
 * marks allocated areas as reserved if necessary. p54_rx_frame_sent frees
 * allocated areas.
 */
static void p54_assign_address(struct ieee80211_hw *dev, struct sk_buff *skb,
                         struct p54_control_hdr *data, u32 len,
                         struct ieee80211_tx_control *control)
{
      struct p54_common *priv = dev->priv;
      struct sk_buff *entry = priv->tx_queue.next;
      struct sk_buff *target_skb = NULL;
      struct memrecord *range;
      u32 last_addr = priv->rx_start;
      u32 largest_hole = 0;
      u32 target_addr = priv->rx_start;
      unsigned long flags;
      unsigned int left;
      len = (len + 0x170 + 3) & ~0x3; /* 0x70 headroom, 0x100 tailroom */

      spin_lock_irqsave(&priv->tx_queue.lock, flags);
      left = skb_queue_len(&priv->tx_queue);
      while (left--) {
            u32 hole_size;
            range = (struct memrecord *)&entry->cb;
            hole_size = range->start_addr - last_addr;
            if (!target_skb && hole_size >= len) {
                  target_skb = entry->prev;
                  hole_size -= len;
                  target_addr = last_addr;
            }
            largest_hole = max(largest_hole, hole_size);
            last_addr = range->end_addr;
            entry = entry->next;
      }
      if (!target_skb && priv->rx_end - last_addr >= len) {
            target_skb = priv->tx_queue.prev;
            largest_hole = max(largest_hole, priv->rx_end - last_addr - len);
            if (!skb_queue_empty(&priv->tx_queue)) {
                  range = (struct memrecord *)&target_skb->cb;
                  target_addr = range->end_addr;
            }
      } else
            largest_hole = max(largest_hole, priv->rx_end - last_addr);

      if (skb) {
            range = (struct memrecord *)&skb->cb;
            range->start_addr = target_addr;
            range->end_addr = target_addr + len;
            range->control = control;
            __skb_queue_after(&priv->tx_queue, target_skb, skb);
            if (largest_hole < IEEE80211_MAX_RTS_THRESHOLD + 0x170 +
                           sizeof(struct p54_control_hdr))
                  ieee80211_stop_queues(dev);
      }
      spin_unlock_irqrestore(&priv->tx_queue.lock, flags);

      data->req_id = cpu_to_le32(target_addr + 0x70);
}

static int p54_tx(struct ieee80211_hw *dev, struct sk_buff *skb,
              struct ieee80211_tx_control *control)
{
      struct ieee80211_tx_queue_stats_data *current_queue;
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_allocdata *txhdr;
      struct ieee80211_tx_control *control_copy;
      size_t padding, len;
      u8 rate;

      current_queue = &priv->tx_stats.data[control->queue];
      if (unlikely(current_queue->len > current_queue->limit))
            return NETDEV_TX_BUSY;
      current_queue->len++;
      current_queue->count++;
      if (current_queue->len == current_queue->limit)
            ieee80211_stop_queue(dev, control->queue);

      padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
      len = skb->len;

      control_copy = kmalloc(sizeof(*control), GFP_ATOMIC);
      if (control_copy)
            memcpy(control_copy, control, sizeof(*control));

      txhdr = (struct p54_tx_control_allocdata *)
                  skb_push(skb, sizeof(*txhdr) + padding);
      hdr = (struct p54_control_hdr *) skb_push(skb, sizeof(*hdr));

      if (padding)
            hdr->magic1 = cpu_to_le16(0x4010);
      else
            hdr->magic1 = cpu_to_le16(0x0010);
      hdr->len = cpu_to_le16(len);
      hdr->type = (control->flags & IEEE80211_TXCTL_NO_ACK) ? 0 : cpu_to_le16(1);
      hdr->retry1 = hdr->retry2 = control->retry_limit;
      p54_assign_address(dev, skb, hdr, skb->len, control_copy);

      memset(txhdr->wep_key, 0x0, 16);
      txhdr->padding = 0;
      txhdr->padding2 = 0;

      /* TODO: add support for alternate retry TX rates */
      rate = control->tx_rate;
      if (control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
            rate |= 0x40;
      else if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
            rate |= 0x20;
      memset(txhdr->rateset, rate, 8);
      txhdr->wep_key_present = 0;
      txhdr->wep_key_len = 0;
      txhdr->frame_type = cpu_to_le32(control->queue + 4);
      txhdr->magic4 = 0;
      txhdr->antenna = (control->antenna_sel_tx == 0) ?
            2 : control->antenna_sel_tx - 1;
      txhdr->output_power = 0x7f; // HW Maximum
      txhdr->magic5 = (control->flags & IEEE80211_TXCTL_NO_ACK) ?
            0 : ((rate > 0x3) ? cpu_to_le32(0x33) : cpu_to_le32(0x23));
      if (padding)
            txhdr->align[0] = padding;

      priv->tx(dev, hdr, skb->len, 0);
      return 0;
}

static int p54_set_filter(struct ieee80211_hw *dev, u16 filter_type,
                    const u8 *dst, const u8 *src, u8 antenna,
                    u32 magic3, u32 magic8, u32 magic9)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_filter *filter;

      hdr = kzalloc(sizeof(*hdr) + sizeof(*filter) +
                  priv->tx_hdr_len, GFP_ATOMIC);
      if (!hdr)
            return -ENOMEM;

      hdr = (void *)hdr + priv->tx_hdr_len;

      filter = (struct p54_tx_control_filter *) hdr->data;
      hdr->magic1 = cpu_to_le16(0x8001);
      hdr->len = cpu_to_le16(sizeof(*filter));
      p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*filter), NULL);
      hdr->type = cpu_to_le16(P54_CONTROL_TYPE_FILTER_SET);

      filter->filter_type = cpu_to_le16(filter_type);
      memcpy(filter->dst, dst, ETH_ALEN);
      if (!src)
            memset(filter->src, ~0, ETH_ALEN);
      else
            memcpy(filter->src, src, ETH_ALEN);
      filter->antenna = antenna;
      filter->magic3 = cpu_to_le32(magic3);
      filter->rx_addr = cpu_to_le32(priv->rx_end);
      filter->max_rx = cpu_to_le16(0x0620);     /* FIXME: for usb ver 1.. maybe */
      filter->rxhw = priv->rxhw;
      filter->magic8 = cpu_to_le16(magic8);
      filter->magic9 = cpu_to_le16(magic9);

      priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*filter), 1);
      return 0;
}

static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_channel *chan;
      unsigned int i;
      size_t payload_len = sizeof(*chan) + sizeof(u32)*2 +
                       sizeof(*chan->curve_data) *
                       priv->curve_data->points_per_channel;
      void *entry;

      hdr = kzalloc(sizeof(*hdr) + payload_len +
                  priv->tx_hdr_len, GFP_KERNEL);
      if (!hdr)
            return -ENOMEM;

      hdr = (void *)hdr + priv->tx_hdr_len;

      chan = (struct p54_tx_control_channel *) hdr->data;

      hdr->magic1 = cpu_to_le16(0x8001);
      hdr->len = cpu_to_le16(sizeof(*chan));
      hdr->type = cpu_to_le16(P54_CONTROL_TYPE_CHANNEL_CHANGE);
      p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + payload_len, NULL);

      chan->magic1 = cpu_to_le16(0x1);
      chan->magic2 = cpu_to_le16(0x0);

      for (i = 0; i < priv->iq_autocal_len; i++) {
            if (priv->iq_autocal[i].freq != freq)
                  continue;

            memcpy(&chan->iq_autocal, &priv->iq_autocal[i],
                   sizeof(*priv->iq_autocal));
            break;
      }
      if (i == priv->iq_autocal_len)
            goto err;

      for (i = 0; i < priv->output_limit_len; i++) {
            if (priv->output_limit[i].freq != freq)
                  continue;

            chan->val_barker = 0x38;
            chan->val_bpsk = priv->output_limit[i].val_bpsk;
            chan->val_qpsk = priv->output_limit[i].val_qpsk;
            chan->val_16qam = priv->output_limit[i].val_16qam;
            chan->val_64qam = priv->output_limit[i].val_64qam;
            break;
      }
      if (i == priv->output_limit_len)
            goto err;

      chan->pa_points_per_curve = priv->curve_data->points_per_channel;

      entry = priv->curve_data->data;
      for (i = 0; i < priv->curve_data->channels; i++) {
            if (*((__le16 *)entry) != freq) {
                  entry += sizeof(__le16);
                  entry += sizeof(struct pda_pa_curve_data_sample_rev1) *
                         chan->pa_points_per_curve;
                  continue;
            }

            entry += sizeof(__le16);
            memcpy(chan->curve_data, entry, sizeof(*chan->curve_data) *
                   chan->pa_points_per_curve);
            break;
      }

      memcpy(hdr->data + payload_len - 4, &chan->val_bpsk, 4);

      priv->tx(dev, hdr, sizeof(*hdr) + payload_len, 1);
      return 0;

 err:
      printk(KERN_ERR "%s: frequency change failed\n", wiphy_name(dev->wiphy));
      kfree(hdr);
      return -EINVAL;
}

static int p54_set_leds(struct ieee80211_hw *dev, int mode, int link, int act)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_led *led;

      hdr = kzalloc(sizeof(*hdr) + sizeof(*led) +
                  priv->tx_hdr_len, GFP_KERNEL);
      if (!hdr)
            return -ENOMEM;

      hdr = (void *)hdr + priv->tx_hdr_len;
      hdr->magic1 = cpu_to_le16(0x8001);
      hdr->len = cpu_to_le16(sizeof(*led));
      hdr->type = cpu_to_le16(P54_CONTROL_TYPE_LED);
      p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*led), NULL);

      led = (struct p54_tx_control_led *) hdr->data;
      led->mode = cpu_to_le16(mode);
      led->led_permanent = cpu_to_le16(link);
      led->led_temporary = cpu_to_le16(act);
      led->duration = cpu_to_le16(1000);

      priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*led), 1);

      return 0;
}

#define P54_SET_QUEUE(queue, ai_fs, cw_min, cw_max, burst)  \
do {                                            \
      queue.aifs = cpu_to_le16(ai_fs);                \
      queue.cwmin = cpu_to_le16(cw_min);              \
      queue.cwmax = cpu_to_le16(cw_max);              \
      queue.txop = (burst == 0) ?                     \
            0 : cpu_to_le16((burst * 100) / 32 + 1);  \
} while(0)

static void p54_init_vdcf(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_vdcf *vdcf;

      /* all USB V1 adapters need a extra headroom */
      hdr = (void *)priv->cached_vdcf + priv->tx_hdr_len;
      hdr->magic1 = cpu_to_le16(0x8001);
      hdr->len = cpu_to_le16(sizeof(*vdcf));
      hdr->type = cpu_to_le16(P54_CONTROL_TYPE_DCFINIT);
      hdr->req_id = cpu_to_le32(priv->rx_start);

      vdcf = (struct p54_tx_control_vdcf *) hdr->data;

      P54_SET_QUEUE(vdcf->queue[0], 0x0002, 0x0003, 0x0007, 0x000f);
      P54_SET_QUEUE(vdcf->queue[1], 0x0002, 0x0007, 0x000f, 0x001e);
      P54_SET_QUEUE(vdcf->queue[2], 0x0002, 0x000f, 0x03ff, 0x0014);
      P54_SET_QUEUE(vdcf->queue[3], 0x0007, 0x000f, 0x03ff, 0x0000);
}

static void p54_set_vdcf(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      struct p54_control_hdr *hdr;
      struct p54_tx_control_vdcf *vdcf;

      hdr = (void *)priv->cached_vdcf + priv->tx_hdr_len;

      p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*vdcf), NULL);

      vdcf = (struct p54_tx_control_vdcf *) hdr->data;

      if (dev->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) {
            vdcf->slottime = 9;
            vdcf->magic1 = 0x00;
            vdcf->magic2 = 0x10;
      } else {
            vdcf->slottime = 20;
            vdcf->magic1 = 0x0a;
            vdcf->magic2 = 0x06;
      }

      /* (see prism54/isl_oid.h for further details) */
      vdcf->frameburst = cpu_to_le16(0);

      priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*vdcf), 0);
}

static int p54_start(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      int err;

      err = priv->open(dev);
      if (!err)
            priv->mode = IEEE80211_IF_TYPE_MNTR;

      return err;
}

static void p54_stop(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      struct sk_buff *skb;
      while ((skb = skb_dequeue(&priv->tx_queue))) {
            struct memrecord *range = (struct memrecord *)&skb->cb;
            if (range->control)
                  kfree(range->control);
            kfree_skb(skb);
      }
      priv->stop(dev);
      priv->mode = IEEE80211_IF_TYPE_INVALID;
}

static int p54_add_interface(struct ieee80211_hw *dev,
                       struct ieee80211_if_init_conf *conf)
{
      struct p54_common *priv = dev->priv;

      if (priv->mode != IEEE80211_IF_TYPE_MNTR)
            return -EOPNOTSUPP;

      switch (conf->type) {
      case IEEE80211_IF_TYPE_STA:
            priv->mode = conf->type;
            break;
      default:
            return -EOPNOTSUPP;
      }

      memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);

      p54_set_filter(dev, 0, priv->mac_addr, NULL, 0, 1, 0, 0xF642);
      p54_set_filter(dev, 0, priv->mac_addr, NULL, 1, 0, 0, 0xF642);

      switch (conf->type) {
      case IEEE80211_IF_TYPE_STA:
            p54_set_filter(dev, 1, priv->mac_addr, NULL, 0, 0x15F, 0x1F4, 0);
            break;
      default:
            BUG();      /* impossible */
            break;
      }

      p54_set_leds(dev, 1, 0, 0);

      return 0;
}

static void p54_remove_interface(struct ieee80211_hw *dev,
                         struct ieee80211_if_init_conf *conf)
{
      struct p54_common *priv = dev->priv;
      priv->mode = IEEE80211_IF_TYPE_MNTR;
      memset(priv->mac_addr, 0, ETH_ALEN);
      p54_set_filter(dev, 0, priv->mac_addr, NULL, 2, 0, 0, 0);
}

static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
{
      int ret;

      ret = p54_set_freq(dev, cpu_to_le16(conf->freq));
      p54_set_vdcf(dev);
      return ret;
}

static int p54_config_interface(struct ieee80211_hw *dev, int if_id,
                        struct ieee80211_if_conf *conf)
{
      struct p54_common *priv = dev->priv;

      p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 0, 1, 0, 0xF642);
      p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 2, 0, 0, 0);
      p54_set_leds(dev, 1, !is_multicast_ether_addr(conf->bssid), 0);
      memcpy(priv->bssid, conf->bssid, ETH_ALEN);
      return 0;
}

static void p54_configure_filter(struct ieee80211_hw *dev,
                         unsigned int changed_flags,
                         unsigned int *total_flags,
                         int mc_count, struct dev_mc_list *mclist)
{
      struct p54_common *priv = dev->priv;

      *total_flags &= FIF_BCN_PRBRESP_PROMISC;

      if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
            if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
                  p54_set_filter(dev, 0, priv->mac_addr,
                               NULL, 2, 0, 0, 0);
            else
                  p54_set_filter(dev, 0, priv->mac_addr,
                               priv->bssid, 2, 0, 0, 0);
      }
}

static int p54_conf_tx(struct ieee80211_hw *dev, int queue,
                   const struct ieee80211_tx_queue_params *params)
{
      struct p54_common *priv = dev->priv;
      struct p54_tx_control_vdcf *vdcf;

      vdcf = (struct p54_tx_control_vdcf *)(((struct p54_control_hdr *)
            ((void *)priv->cached_vdcf + priv->tx_hdr_len))->data);

      if ((params) && !((queue < 0) || (queue > 4))) {
            P54_SET_QUEUE(vdcf->queue[queue], params->aifs,
                  params->cw_min, params->cw_max, params->burst_time);
      } else
            return -EINVAL;

      p54_set_vdcf(dev);

      return 0;
}

static int p54_get_stats(struct ieee80211_hw *dev,
                   struct ieee80211_low_level_stats *stats)
{
      /* TODO */
      return 0;
}

static int p54_get_tx_stats(struct ieee80211_hw *dev,
                      struct ieee80211_tx_queue_stats *stats)
{
      struct p54_common *priv = dev->priv;
      unsigned int i;

      for (i = 0; i < dev->queues; i++)
            memcpy(&stats->data[i], &priv->tx_stats.data[i],
                  sizeof(stats->data[i]));

      return 0;
}

static const struct ieee80211_ops p54_ops = {
      .tx               = p54_tx,
      .start                  = p54_start,
      .stop             = p54_stop,
      .add_interface          = p54_add_interface,
      .remove_interface = p54_remove_interface,
      .config                 = p54_config,
      .config_interface = p54_config_interface,
      .configure_filter = p54_configure_filter,
      .conf_tx          = p54_conf_tx,
      .get_stats        = p54_get_stats,
      .get_tx_stats           = p54_get_tx_stats
};

struct ieee80211_hw *p54_init_common(size_t priv_data_len)
{
      struct ieee80211_hw *dev;
      struct p54_common *priv;
      int i;

      dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
      if (!dev)
            return NULL;

      priv = dev->priv;
      priv->mode = IEEE80211_IF_TYPE_INVALID;
      skb_queue_head_init(&priv->tx_queue);
      memcpy(priv->channels, p54_channels, sizeof(p54_channels));
      memcpy(priv->rates, p54_rates, sizeof(p54_rates));
      priv->modes[1].mode = MODE_IEEE80211B;
      priv->modes[1].num_rates = 4;
      priv->modes[1].rates = priv->rates;
      priv->modes[1].num_channels = ARRAY_SIZE(p54_channels);
      priv->modes[1].channels = priv->channels;
      priv->modes[0].mode = MODE_IEEE80211G;
      priv->modes[0].num_rates = ARRAY_SIZE(p54_rates);
      priv->modes[0].rates = priv->rates;
      priv->modes[0].num_channels = ARRAY_SIZE(p54_channels);
      priv->modes[0].channels = priv->channels;
      dev->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING | /* not sure */
                IEEE80211_HW_RX_INCLUDES_FCS;
      dev->channel_change_time = 1000;    /* TODO: find actual value */
      dev->max_rssi = 127;

      priv->tx_stats.data[0].limit = 5;
      dev->queues = 1;

      dev->extra_tx_headroom = sizeof(struct p54_control_hdr) + 4 +
                         sizeof(struct p54_tx_control_allocdata);

        priv->cached_vdcf = kzalloc(sizeof(struct p54_tx_control_vdcf) +
              priv->tx_hdr_len + sizeof(struct p54_control_hdr), GFP_KERNEL);

      if (!priv->cached_vdcf) {
            ieee80211_free_hw(dev);
            return NULL;
      }

      p54_init_vdcf(dev);

      for (i = 0; i < 2; i++) {
            if (ieee80211_register_hwmode(dev, &priv->modes[i])) {
                  kfree(priv->cached_vdcf);
                  ieee80211_free_hw(dev);
                  return NULL;
            }
      }

      return dev;
}
EXPORT_SYMBOL_GPL(p54_init_common);

void p54_free_common(struct ieee80211_hw *dev)
{
      struct p54_common *priv = dev->priv;
      kfree(priv->iq_autocal);
      kfree(priv->output_limit);
      kfree(priv->curve_data);
      kfree(priv->cached_vdcf);
}
EXPORT_SYMBOL_GPL(p54_free_common);

static int __init p54_init(void)
{
      return 0;
}

static void __exit p54_exit(void)
{
}

module_init(p54_init);
module_exit(p54_exit);

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