eeprom.c

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/*
 * EEPROM parser code for mac80211 Prism54 drivers
 *
 * Copyright (c) 2006, Michael Wu <[email protected]>
 * Copyright (c) 2007-2009, Christian Lamparter <[email protected]>
 * Copyright 2008, Johannes Berg <[email protected]>
 *
 * Based on:
 * - the islsm (softmac prism54) driver, which is:
 *   Copyright 2004-2006 Jean-Baptiste Note <[email protected]>, et al.
 * - stlc45xx driver
 *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 *
 * 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 <linux/sort.h>
#include <linux/slab.h>

#include <net/mac80211.h>
#include <linux/crc-ccitt.h>
#include <linux/export.h>

#include "p54.h"
#include "eeprom.h"
#include "lmac.h"

static struct ieee80211_rate p54_bgrates[] = {
    { .bitrate = 10, .hw_value = 0, },
    { .bitrate = 20, .hw_value = 1, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 55, .hw_value = 2, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 110, .hw_value = 3, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 60, .hw_value = 4, },
    { .bitrate = 90, .hw_value = 5, },
    { .bitrate = 120, .hw_value = 6, },
    { .bitrate = 180, .hw_value = 7, },
    { .bitrate = 240, .hw_value = 8, },
    { .bitrate = 360, .hw_value = 9, },
    { .bitrate = 480, .hw_value = 10, },
    { .bitrate = 540, .hw_value = 11, },
};

static struct ieee80211_rate p54_arates[] = {
    { .bitrate = 60, .hw_value = 4, },
    { .bitrate = 90, .hw_value = 5, },
    { .bitrate = 120, .hw_value = 6, },
    { .bitrate = 180, .hw_value = 7, },
    { .bitrate = 240, .hw_value = 8, },
    { .bitrate = 360, .hw_value = 9, },
    { .bitrate = 480, .hw_value = 10, },
    { .bitrate = 540, .hw_value = 11, },
};

static struct p54_rssi_db_entry p54_rssi_default = {
    /*
     * The defaults are taken from usb-logs of the
     * vendor driver. So, they should be safe to
     * use in case we can't get a match from the
     * rssi <-> dBm conversion database.
     */
    .mul = 130,
    .add = -398,
};

#define CHAN_HAS_CAL        BIT(0)
#define CHAN_HAS_LIMIT      BIT(1)
#define CHAN_HAS_CURVE      BIT(2)
#define CHAN_HAS_ALL        (CHAN_HAS_CAL | CHAN_HAS_LIMIT | CHAN_HAS_CURVE)

struct p54_channel_entry {
    u16 freq;
    u16 data;
    int index;
    int max_power;
    enum ieee80211_band band;
};

struct p54_channel_list {
    struct p54_channel_entry *channels;
    size_t entries;
    size_t max_entries;
    size_t band_channel_num[IEEE80211_NUM_BANDS];
};

static int p54_get_band_from_freq(u16 freq)
{
    /* FIXME: sync these values with the 802.11 spec */

    if ((freq >= 2412) && (freq <= 2484))
        return IEEE80211_BAND_2GHZ;

    if ((freq >= 4920) && (freq <= 5825))
        return IEEE80211_BAND_5GHZ;

    return -1;
}

static int same_band(u16 freq, u16 freq2)
{
    return p54_get_band_from_freq(freq) == p54_get_band_from_freq(freq2);
}

static int p54_compare_channels(const void *_a,
                const void *_b)
{
    const struct p54_channel_entry *a = _a;
    const struct p54_channel_entry *b = _b;

    return a->freq - b->freq;
}

static int p54_compare_rssichan(const void *_a,
                const void *_b)
{
    const struct p54_rssi_db_entry *a = _a;
    const struct p54_rssi_db_entry *b = _b;

    return a->freq - b->freq;
}

static int p54_fill_band_bitrates(struct ieee80211_hw *dev,
                  struct ieee80211_supported_band *band_entry,
                  enum ieee80211_band band)
{
    /* TODO: generate rate array dynamically */

    switch (band) {
    case IEEE80211_BAND_2GHZ:
        band_entry->bitrates = p54_bgrates;
        band_entry->n_bitrates = ARRAY_SIZE(p54_bgrates);
        break;
    case IEEE80211_BAND_5GHZ:
        band_entry->bitrates = p54_arates;
        band_entry->n_bitrates = ARRAY_SIZE(p54_arates);
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static int p54_generate_band(struct ieee80211_hw *dev,
                 struct p54_channel_list *list,
                 unsigned int *chan_num,
                 enum ieee80211_band band)
{
    struct p54_common *priv = dev->priv;
    struct ieee80211_supported_band *tmp, *old;
    unsigned int i, j;
    int ret = -ENOMEM;

    if ((!list->entries) || (!list->band_channel_num[band]))
        return -EINVAL;

    tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
    if (!tmp)
        goto err_out;

    tmp->channels = kzalloc(sizeof(struct ieee80211_channel) *
                list->band_channel_num[band], GFP_KERNEL);
    if (!tmp->channels)
        goto err_out;

    ret = p54_fill_band_bitrates(dev, tmp, band);
    if (ret)
        goto err_out;

    for (i = 0, j = 0; (j < list->band_channel_num[band]) &&
               (i < list->entries); i++) {
        struct p54_channel_entry *chan = &list->channels[i];
        struct ieee80211_channel *dest = &tmp->channels[j];

        if (chan->band != band)
            continue;

        if (chan->data != CHAN_HAS_ALL) {
            wiphy_err(dev->wiphy, "%s%s%s is/are missing for "
                  "channel:%d [%d MHz].\n",
                  (chan->data & CHAN_HAS_CAL ? "" :
                   " [iqauto calibration data]"),
                  (chan->data & CHAN_HAS_LIMIT ? "" :
                   " [output power limits]"),
                  (chan->data & CHAN_HAS_CURVE ? "" :
                   " [curve data]"),
                  chan->index, chan->freq);
            continue;
        }

        dest->band = chan->band;
        dest->center_freq = chan->freq;
        dest->max_power = chan->max_power;
        priv->survey[*chan_num].channel = &tmp->channels[j];
        priv->survey[*chan_num].filled = SURVEY_INFO_NOISE_DBM |
            SURVEY_INFO_CHANNEL_TIME |
            SURVEY_INFO_CHANNEL_TIME_BUSY |
            SURVEY_INFO_CHANNEL_TIME_TX;
        dest->hw_value = (*chan_num);
        j++;
        (*chan_num)++;
    }

    if (j == 0) {
        wiphy_err(dev->wiphy, "Disabling totally damaged %d GHz band\n",
              (band == IEEE80211_BAND_2GHZ) ? 2 : 5);

        ret = -ENODATA;
        goto err_out;
    }

    tmp->n_channels = j;
    old = priv->band_table[band];
    priv->band_table[band] = tmp;
    if (old) {
        kfree(old->channels);
        kfree(old);
    }

    return 0;

err_out:
    if (tmp) {
        kfree(tmp->channels);
        kfree(tmp);
    }

    return ret;
}

static struct p54_channel_entry *p54_update_channel_param(struct p54_channel_list *list,
                              u16 freq, u16 data)
{
    int i;
    struct p54_channel_entry *entry = NULL;

    /*
     * usually all lists in the eeprom are mostly sorted.
     * so it's very likely that the entry we are looking for
     * is right at the end of the list
     */
    for (i = list->entries; i >= 0; i--) {
        if (freq == list->channels[i].freq) {
            entry = &list->channels[i];
            break;
        }
    }

    if ((i < 0) && (list->entries < list->max_entries)) {
        /* entry does not exist yet. Initialize a new one. */
        int band = p54_get_band_from_freq(freq);

        /*
         * filter out frequencies which don't belong into
         * any supported band.
         */
        if (band >= 0) {
            i = list->entries++;
            list->band_channel_num[band]++;

            entry = &list->channels[i];
            entry->freq = freq;
            entry->band = band;
            entry->index = ieee80211_frequency_to_channel(freq);
            entry->max_power = 0;
            entry->data = 0;
        }
    }

    if (entry)
        entry->data |= data;

    return entry;
}

static int p54_get_maxpower(struct p54_common *priv, void *data)
{
    switch (priv->rxhw & PDR_SYNTH_FRONTEND_MASK) {
    case PDR_SYNTH_FRONTEND_LONGBOW: {
        struct pda_channel_output_limit_longbow *pda = data;
        int j;
        u16 rawpower = 0;
        pda = data;
        for (j = 0; j < ARRAY_SIZE(pda->point); j++) {
            struct pda_channel_output_limit_point_longbow *point =
                &pda->point[j];
            rawpower = max_t(u16,
                rawpower, le16_to_cpu(point->val_qpsk));
            rawpower = max_t(u16,
                rawpower, le16_to_cpu(point->val_bpsk));
            rawpower = max_t(u16,
                rawpower, le16_to_cpu(point->val_16qam));
            rawpower = max_t(u16,
                rawpower, le16_to_cpu(point->val_64qam));
        }
        /* longbow seems to use 1/16 dBm units */
        return rawpower / 16;
        }

    case PDR_SYNTH_FRONTEND_DUETTE3:
    case PDR_SYNTH_FRONTEND_DUETTE2:
    case PDR_SYNTH_FRONTEND_FRISBEE:
    case PDR_SYNTH_FRONTEND_XBOW: {
        struct pda_channel_output_limit *pda = data;
        u8 rawpower = 0;
        rawpower = max(rawpower, pda->val_qpsk);
        rawpower = max(rawpower, pda->val_bpsk);
        rawpower = max(rawpower, pda->val_16qam);
        rawpower = max(rawpower, pda->val_64qam);
        /* raw values are in 1/4 dBm units */
        return rawpower / 4;
        }

    default:
        return 20;
    }
}

static int p54_generate_channel_lists(struct ieee80211_hw *dev)
{
    struct p54_common *priv = dev->priv;
    struct p54_channel_list *list;
    unsigned int i, j, k, max_channel_num;
    int ret = 0;
    u16 freq;

    if ((priv->iq_autocal_len != priv->curve_data->entries) ||
        (priv->iq_autocal_len != priv->output_limit->entries))
        wiphy_err(dev->wiphy,
              "Unsupported or damaged EEPROM detected. "
              "You may not be able to use all channels.\n");

    max_channel_num = max_t(unsigned int, priv->output_limit->entries,
                priv->iq_autocal_len);
    max_channel_num = max_t(unsigned int, max_channel_num,
                priv->curve_data->entries);

    list = kzalloc(sizeof(*list), GFP_KERNEL);
    if (!list) {
        ret = -ENOMEM;
        goto free;
    }
    priv->chan_num = max_channel_num;
    priv->survey = kzalloc(sizeof(struct survey_info) * max_channel_num,
                   GFP_KERNEL);
    if (!priv->survey) {
        ret = -ENOMEM;
        goto free;
    }

    list->max_entries = max_channel_num;
    list->channels = kzalloc(sizeof(struct p54_channel_entry) *
                 max_channel_num, GFP_KERNEL);
    if (!list->channels) {
        ret = -ENOMEM;
        goto free;
    }

    for (i = 0; i < max_channel_num; i++) {
        if (i < priv->iq_autocal_len) {
            freq = le16_to_cpu(priv->iq_autocal[i].freq);
            p54_update_channel_param(list, freq, CHAN_HAS_CAL);
        }

        if (i < priv->output_limit->entries) {
            struct p54_channel_entry *tmp;

            void *data = (void *) ((unsigned long) i *
                priv->output_limit->entry_size +
                priv->output_limit->offset +
                priv->output_limit->data);

            freq = le16_to_cpup((__le16 *) data);
            tmp = p54_update_channel_param(list, freq,
                               CHAN_HAS_LIMIT);
            if (tmp) {
                tmp->max_power = p54_get_maxpower(priv, data);
            }
        }

        if (i < priv->curve_data->entries) {
            freq = le16_to_cpup((__le16 *) (i *
                        priv->curve_data->entry_size +
                        priv->curve_data->offset +
                        priv->curve_data->data));

            p54_update_channel_param(list, freq, CHAN_HAS_CURVE);
        }
    }

    /* sort the channel list by frequency */
    sort(list->channels, list->entries, sizeof(struct p54_channel_entry),
         p54_compare_channels, NULL);

    k = 0;
    for (i = 0, j = 0; i < IEEE80211_NUM_BANDS; i++) {
        if (p54_generate_band(dev, list, &k, i) == 0)
            j++;
    }
    if (j == 0) {
        /* no useable band available. */
        ret = -EINVAL;
    }

free:
    if (list) {
        kfree(list->channels);
        kfree(list);
    }
    if (ret) {
        kfree(priv->survey);
        priv->survey = NULL;
    }

    return ret;
}

static int p54_convert_rev0(struct ieee80211_hw *dev,
                struct pda_pa_curve_data *curve_data)
{
    struct p54_common *priv = dev->priv;
    struct p54_pa_curve_data_sample *dst;
    struct pda_pa_curve_data_sample_rev0 *src;
    size_t cd_len = sizeof(*curve_data) +
        (curve_data->points_per_channel*sizeof(*dst) + 2) *
         curve_data->channels;
    unsigned int i, j;
    void *source, *target;

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

    priv->curve_data->entries = curve_data->channels;
    priv->curve_data->entry_size = sizeof(__le16) +
        sizeof(*dst) * curve_data->points_per_channel;
    priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
    priv->curve_data->len = cd_len;
    memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
    source = curve_data->data;
    target = ((struct pda_pa_curve_data *) priv->curve_data->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++) {
            dst = target;
            src = source;

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

    return 0;
}

static int p54_convert_rev1(struct ieee80211_hw *dev,
                struct pda_pa_curve_data *curve_data)
{
    struct p54_common *priv = dev->priv;
    struct p54_pa_curve_data_sample *dst;
    struct pda_pa_curve_data_sample_rev1 *src;
    size_t cd_len = sizeof(*curve_data) +
        (curve_data->points_per_channel*sizeof(*dst) + 2) *
         curve_data->channels;
    unsigned int i, j;
    void *source, *target;

    priv->curve_data = kzalloc(cd_len + sizeof(*priv->curve_data),
                   GFP_KERNEL);
    if (!priv->curve_data)
        return -ENOMEM;

    priv->curve_data->entries = curve_data->channels;
    priv->curve_data->entry_size = sizeof(__le16) +
        sizeof(*dst) * curve_data->points_per_channel;
    priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
    priv->curve_data->len = cd_len;
    memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
    source = curve_data->data;
    target = ((struct pda_pa_curve_data *) priv->curve_data->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++) {
            memcpy(target, source, sizeof(*src));

            target += sizeof(*dst);
            source += sizeof(*src);
        }
        source++;
    }

    return 0;
}

static const char *p54_rf_chips[] = { "INVALID-0", "Duette3", "Duette2",
    "Frisbee", "Xbow", "Longbow", "INVALID-6", "INVALID-7" };

static int p54_parse_rssical(struct ieee80211_hw *dev,
                 u8 *data, int len, u16 type)
{
    struct p54_common *priv = dev->priv;
    struct p54_rssi_db_entry *entry;
    size_t db_len, entries;
    int offset = 0, i;

    if (type != PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
        entries = (type == PDR_RSSI_LINEAR_APPROXIMATION) ? 1 : 2;
        if (len != sizeof(struct pda_rssi_cal_entry) * entries) {
            wiphy_err(dev->wiphy, "rssical size mismatch.\n");
            goto err_data;
        }
    } else {
        /*
         * Some devices (Dell 1450 USB, Xbow 5GHz card, etc...)
         * have an empty two byte header.
         */
        if (*((__le16 *)&data[offset]) == cpu_to_le16(0))
            offset += 2;

        entries = (len - offset) /
            sizeof(struct pda_rssi_cal_ext_entry);

        if ((len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
            entries <= 0) {
            wiphy_err(dev->wiphy, "invalid rssi database.\n");
            goto err_data;
        }
    }

    db_len = sizeof(*entry) * entries;
    priv->rssi_db = kzalloc(db_len + sizeof(*priv->rssi_db), GFP_KERNEL);
    if (!priv->rssi_db)
        return -ENOMEM;

    priv->rssi_db->offset = 0;
    priv->rssi_db->entries = entries;
    priv->rssi_db->entry_size = sizeof(*entry);
    priv->rssi_db->len = db_len;

    entry = (void *)((unsigned long)priv->rssi_db->data + priv->rssi_db->offset);
    if (type == PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
        struct pda_rssi_cal_ext_entry *cal = (void *) &data[offset];

        for (i = 0; i < entries; i++) {
            entry[i].freq = le16_to_cpu(cal[i].freq);
            entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
            entry[i].add = (s16) le16_to_cpu(cal[i].add);
        }
    } else {
        struct pda_rssi_cal_entry *cal = (void *) &data[offset];

        for (i = 0; i < entries; i++) {
            u16 freq = 0;
            switch (i) {
            case IEEE80211_BAND_2GHZ:
                freq = 2437;
                break;
            case IEEE80211_BAND_5GHZ:
                freq = 5240;
                break;
            }

            entry[i].freq = freq;
            entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
            entry[i].add = (s16) le16_to_cpu(cal[i].add);
        }
    }

    /* sort the list by channel frequency */
    sort(entry, entries, sizeof(*entry), p54_compare_rssichan, NULL);
    return 0;

err_data:
    wiphy_err(dev->wiphy,
          "rssi calibration data packing type:(%x) len:%d.\n",
          type, len);

    print_hex_dump_bytes("rssical:", DUMP_PREFIX_NONE, data, len);

    wiphy_err(dev->wiphy, "please report this issue.\n");
    return -EINVAL;
}

struct p54_rssi_db_entry *p54_rssi_find(struct p54_common *priv, const u16 freq)
{
    struct p54_rssi_db_entry *entry;
    int i, found = -1;

    if (!priv->rssi_db)
        return &p54_rssi_default;

    entry = (void *)(priv->rssi_db->data + priv->rssi_db->offset);
    for (i = 0; i < priv->rssi_db->entries; i++) {
        if (!same_band(freq, entry[i].freq))
            continue;

        if (found == -1) {
            found = i;
            continue;
        }

        /* nearest match */
        if (abs(freq - entry[i].freq) <
            abs(freq - entry[found].freq)) {
            found = i;
            continue;
        } else {
            break;
        }
    }

    return found < 0 ? &p54_rssi_default : &entry[found];
}

static void p54_parse_default_country(struct ieee80211_hw *dev,
                      void *data, int len)
{
    struct pda_country *country;

    if (len != sizeof(*country)) {
        wiphy_err(dev->wiphy,
              "found possible invalid default country eeprom entry. (entry size: %d)\n",
              len);

        print_hex_dump_bytes("country:", DUMP_PREFIX_NONE,
                     data, len);

        wiphy_err(dev->wiphy, "please report this issue.\n");
        return;
    }

    country = (struct pda_country *) data;
    if (country->flags == PDR_COUNTRY_CERT_CODE_PSEUDO)
        regulatory_hint(dev->wiphy, country->alpha2);
    else {
        /* TODO:
         * write a shared/common function that converts
         * "Regulatory domain codes" (802.11-2007 14.8.2.2)
         * into ISO/IEC 3166-1 alpha2 for regulatory_hint.
         */
    }
}

static int p54_convert_output_limits(struct ieee80211_hw *dev,
                     u8 *data, size_t len)
{
    struct p54_common *priv = dev->priv;

    if (len < 2)
        return -EINVAL;

    if (data[0] != 0) {
        wiphy_err(dev->wiphy, "unknown output power db revision:%x\n",
              data[0]);
        return -EINVAL;
    }

    if (2 + data[1] * sizeof(struct pda_channel_output_limit) > len)
        return -EINVAL;

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

    if (!priv->output_limit)
        return -ENOMEM;

    priv->output_limit->offset = 0;
    priv->output_limit->entries = data[1];
    priv->output_limit->entry_size =
        sizeof(struct pda_channel_output_limit);
    priv->output_limit->len = priv->output_limit->entry_size *
                  priv->output_limit->entries +
                  priv->output_limit->offset;

    memcpy(priv->output_limit->data, &data[2],
           data[1] * sizeof(struct pda_channel_output_limit));

    return 0;
}

static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
                           size_t total_len)
{
    struct p54_cal_database *dst;
    size_t payload_len, entries, entry_size, offset;

    payload_len = le16_to_cpu(src->len);
    entries = le16_to_cpu(src->entries);
    entry_size = le16_to_cpu(src->entry_size);
    offset = le16_to_cpu(src->offset);
    if (((entries * entry_size + offset) != payload_len) ||
         (payload_len + sizeof(*src) != total_len))
        return NULL;

    dst = kmalloc(sizeof(*dst) + payload_len, GFP_KERNEL);
    if (!dst)
        return NULL;

    dst->entries = entries;
    dst->entry_size = entry_size;
    dst->offset = offset;
    dst->len = payload_len;

    memcpy(dst->data, src->data, payload_len);
    return dst;
}

int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
{
    struct p54_common *priv = dev->priv;
    struct eeprom_pda_wrap *wrap;
    struct pda_entry *entry;
    unsigned int data_len, entry_len;
    void *tmp;
    int err;
    u8 *end = (u8 *)eeprom + len;
    u16 synth = 0;
    u16 crc16 = ~0;

    wrap = (struct eeprom_pda_wrap *) eeprom;
    entry = (void *)wrap->data + le16_to_cpu(wrap->len);

    /* verify that at least the entry length/code fits */
    while ((u8 *)entry <= end - sizeof(*entry)) {
        entry_len = le16_to_cpu(entry->len);
        data_len = ((entry_len - 1) << 1);

        /* abort if entry exceeds whole structure */
        if ((u8 *)entry + sizeof(*entry) + data_len > end)
            break;

        switch (le16_to_cpu(entry->code)) {
        case PDR_MAC_ADDRESS:
            if (data_len != ETH_ALEN)
                break;
            SET_IEEE80211_PERM_ADDR(dev, entry->data);
            break;
        case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
            if (priv->output_limit)
                break;
            err = p54_convert_output_limits(dev, entry->data,
                            data_len);
            if (err)
                goto err;
            break;
        case PDR_PRISM_PA_CAL_CURVE_DATA: {
            struct pda_pa_curve_data *curve_data =
                (struct pda_pa_curve_data *)entry->data;
            if (data_len < sizeof(*curve_data)) {
                err = -EINVAL;
                goto err;
            }

            switch (curve_data->cal_method_rev) {
            case 0:
                err = p54_convert_rev0(dev, curve_data);
                break;
            case 1:
                err = p54_convert_rev1(dev, curve_data);
                break;
            default:
                wiphy_err(dev->wiphy,
                      "unknown curve data revision %d\n",
                      curve_data->cal_method_rev);
                err = -ENODEV;
                break;
            }
            if (err)
                goto err;
            }
            break;
        case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
            priv->iq_autocal = kmemdup(entry->data, data_len,
                           GFP_KERNEL);
            if (!priv->iq_autocal) {
                err = -ENOMEM;
                goto err;
            }

            priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
            break;
        case PDR_DEFAULT_COUNTRY:
            p54_parse_default_country(dev, entry->data, data_len);
            break;
        case PDR_INTERFACE_LIST:
            tmp = entry->data;
            while ((u8 *)tmp < entry->data + data_len) {
                struct exp_if *exp_if = tmp;
                if (exp_if->if_id == cpu_to_le16(IF_ID_ISL39000))
                    synth = le16_to_cpu(exp_if->variant);
                tmp += sizeof(*exp_if);
            }
            break;
        case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
            if (data_len < 2)
                break;
            priv->version = *(u8 *)(entry->data + 1);
            break;
        case PDR_RSSI_LINEAR_APPROXIMATION:
        case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND:
        case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED:
            err = p54_parse_rssical(dev, entry->data, data_len,
                        le16_to_cpu(entry->code));
            if (err)
                goto err;
            break;
        case PDR_RSSI_LINEAR_APPROXIMATION_CUSTOMV2: {
            struct pda_custom_wrapper *pda = (void *) entry->data;
            __le16 *src;
            u16 *dst;
            int i;

            if (priv->rssi_db || data_len < sizeof(*pda))
                break;

            priv->rssi_db = p54_convert_db(pda, data_len);
            if (!priv->rssi_db)
                break;

            src = (void *) priv->rssi_db->data;
            dst = (void *) priv->rssi_db->data;

            for (i = 0; i < priv->rssi_db->entries; i++)
                *(dst++) = (s16) le16_to_cpu(*(src++));

            }
            break;
        case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS_CUSTOM: {
            struct pda_custom_wrapper *pda = (void *) entry->data;
            if (priv->output_limit || data_len < sizeof(*pda))
                break;
            priv->output_limit = p54_convert_db(pda, data_len);
            }
            break;
        case PDR_PRISM_PA_CAL_CURVE_DATA_CUSTOM: {
            struct pda_custom_wrapper *pda = (void *) entry->data;
            if (priv->curve_data || data_len < sizeof(*pda))
                break;
            priv->curve_data = p54_convert_db(pda, data_len);
            }
            break;
        case PDR_END:
            crc16 = ~crc_ccitt(crc16, (u8 *) entry, sizeof(*entry));
            if (crc16 != le16_to_cpup((__le16 *)entry->data)) {
                wiphy_err(dev->wiphy, "eeprom failed checksum "
                     "test!\n");
                err = -ENOMSG;
                goto err;
            } else {
                goto good_eeprom;
            }
            break;
        default:
            break;
        }

        crc16 = crc_ccitt(crc16, (u8 *)entry, (entry_len + 1) * 2);
        entry = (void *)entry + (entry_len + 1) * 2;
    }

    wiphy_err(dev->wiphy, "unexpected end of eeprom data.\n");
    err = -ENODATA;
    goto err;

good_eeprom:
    if (!synth || !priv->iq_autocal || !priv->output_limit ||
        !priv->curve_data) {
        wiphy_err(dev->wiphy,
              "not all required entries found in eeprom!\n");
        err = -EINVAL;
        goto err;
    }

    priv->rxhw = synth & PDR_SYNTH_FRONTEND_MASK;

    err = p54_generate_channel_lists(dev);
    if (err)
        goto err;

    if (priv->rxhw == PDR_SYNTH_FRONTEND_XBOW)
        p54_init_xbow_synth(priv);
    if (!(synth & PDR_SYNTH_24_GHZ_DISABLED))
        dev->wiphy->bands[IEEE80211_BAND_2GHZ] =
            priv->band_table[IEEE80211_BAND_2GHZ];
    if (!(synth & PDR_SYNTH_5_GHZ_DISABLED))
        dev->wiphy->bands[IEEE80211_BAND_5GHZ] =
            priv->band_table[IEEE80211_BAND_5GHZ];
    if ((synth & PDR_SYNTH_RX_DIV_MASK) == PDR_SYNTH_RX_DIV_SUPPORTED)
        priv->rx_diversity_mask = 3;
    if ((synth & PDR_SYNTH_TX_DIV_MASK) == PDR_SYNTH_TX_DIV_SUPPORTED)
        priv->tx_diversity_mask = 3;

    if (!is_valid_ether_addr(dev->wiphy->perm_addr)) {
        u8 perm_addr[ETH_ALEN];

        wiphy_warn(dev->wiphy,
               "Invalid hwaddr! Using randomly generated MAC addr\n");
        eth_random_addr(perm_addr);
        SET_IEEE80211_PERM_ADDR(dev, perm_addr);
    }

    priv->cur_rssi = &p54_rssi_default;

    wiphy_info(dev->wiphy, "hwaddr %pM, MAC:isl38%02x RF:%s\n",
           dev->wiphy->perm_addr, priv->version,
           p54_rf_chips[priv->rxhw]);

    return 0;

err:
    kfree(priv->iq_autocal);
    kfree(priv->output_limit);
    kfree(priv->curve_data);
    kfree(priv->rssi_db);
    kfree(priv->survey);
    priv->iq_autocal = NULL;
    priv->output_limit = NULL;
    priv->curve_data = NULL;
    priv->rssi_db = NULL;
    priv->survey = NULL;

    wiphy_err(dev->wiphy, "eeprom parse failed!\n");
    return err;
}
EXPORT_SYMBOL_GPL(p54_parse_eeprom);

int p54_read_eeprom(struct ieee80211_hw *dev)
{
    struct p54_common *priv = dev->priv;
    size_t eeprom_size = 0x2020, offset = 0, blocksize, maxblocksize;
    int ret = -ENOMEM;
    void *eeprom;

    maxblocksize = EEPROM_READBACK_LEN;
    if (priv->fw_var >= 0x509)
        maxblocksize -= 0xc;
    else
        maxblocksize -= 0x4;

    eeprom = kzalloc(eeprom_size, GFP_KERNEL);
    if (unlikely(!eeprom))
        goto free;

    while (eeprom_size) {
        blocksize = min(eeprom_size, maxblocksize);
        ret = p54_download_eeprom(priv, eeprom + offset,
                      offset, blocksize);
        if (unlikely(ret))
            goto free;

        offset += blocksize;
        eeprom_size -= blocksize;
    }

    ret = p54_parse_eeprom(dev, eeprom, offset);
free:
    kfree(eeprom);
    return ret;
}
EXPORT_SYMBOL_GPL(p54_read_eeprom);