Pileus Git - ~andy/linux/blob - drivers/net/wireless/p54/eeprom.c

   1 /*
   2  * EEPROM parser code for mac80211 Prism54 drivers
   3  *
   4  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   5  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * Based on:
   9  * - the islsm (softmac prism54) driver, which is:
  10  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  11  * - stlc45xx driver
  12  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/sort.h>
  23 #include <linux/slab.h>
  24
  25 #include <net/mac80211.h>
  26 #include <linux/crc-ccitt.h>
  27 #include <linux/export.h>
  28
  29 #include "p54.h"
  30 #include "eeprom.h"
  31 #include "lmac.h"
  32
  33 static struct ieee80211_rate p54_bgrates[] = {
  34         { .bitrate = 10, .hw_value = 0, },
  35         { .bitrate = 20, .hw_value = 1, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  36         { .bitrate = 55, .hw_value = 2, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  37         { .bitrate = 110, .hw_value = 3, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  38         { .bitrate = 60, .hw_value = 4, },
  39         { .bitrate = 90, .hw_value = 5, },
  40         { .bitrate = 120, .hw_value = 6, },
  41         { .bitrate = 180, .hw_value = 7, },
  42         { .bitrate = 240, .hw_value = 8, },
  43         { .bitrate = 360, .hw_value = 9, },
  44         { .bitrate = 480, .hw_value = 10, },
  45         { .bitrate = 540, .hw_value = 11, },
  46 };
  47
  48 static struct ieee80211_rate p54_arates[] = {
  49         { .bitrate = 60, .hw_value = 4, },
  50         { .bitrate = 90, .hw_value = 5, },
  51         { .bitrate = 120, .hw_value = 6, },
  52         { .bitrate = 180, .hw_value = 7, },
  53         { .bitrate = 240, .hw_value = 8, },
  54         { .bitrate = 360, .hw_value = 9, },
  55         { .bitrate = 480, .hw_value = 10, },
  56         { .bitrate = 540, .hw_value = 11, },
  57 };
  58
  59 static struct p54_rssi_db_entry p54_rssi_default = {
  60         /*
  61          * The defaults are taken from usb-logs of the
  62          * vendor driver. So, they should be safe to
  63          * use in case we can't get a match from the
  64          * rssi <-> dBm conversion database.
  65          */
  66         .mul = 130,
  67         .add = -398,
  68 };
  69
  70 #define CHAN_HAS_CAL            BIT(0)
  71 #define CHAN_HAS_LIMIT          BIT(1)
  72 #define CHAN_HAS_CURVE          BIT(2)
  73 #define CHAN_HAS_ALL            (CHAN_HAS_CAL | CHAN_HAS_LIMIT | CHAN_HAS_CURVE)
  74
  75 struct p54_channel_entry {
  76         u16 freq;
  77         u16 data;
  78         int index;
  79         int max_power;
  80         enum ieee80211_band band;
  81 };
  82
  83 struct p54_channel_list {
  84         struct p54_channel_entry *channels;
  85         size_t entries;
  86         size_t max_entries;
  87         size_t band_channel_num[IEEE80211_NUM_BANDS];
  88 };
  89
  90 static int p54_get_band_from_freq(u16 freq)
  91 {
  92         /* FIXME: sync these values with the 802.11 spec */
  93
  94         if ((freq >= 2412) && (freq <= 2484))
  95                 return IEEE80211_BAND_2GHZ;
  96
  97         if ((freq >= 4920) && (freq <= 5825))
  98                 return IEEE80211_BAND_5GHZ;
  99
 100         return -1;
 101 }
 102
 103 static int same_band(u16 freq, u16 freq2)
 104 {
 105         return p54_get_band_from_freq(freq) == p54_get_band_from_freq(freq2);
 106 }
 107
 108 static int p54_compare_channels(const void *_a,
 109                                 const void *_b)
 110 {
 111         const struct p54_channel_entry *a = _a;
 112         const struct p54_channel_entry *b = _b;
 113
 114         return a->freq - b->freq;
 115 }
 116
 117 static int p54_compare_rssichan(const void *_a,
 118                                 const void *_b)
 119 {
 120         const struct p54_rssi_db_entry *a = _a;
 121         const struct p54_rssi_db_entry *b = _b;
 122
 123         return a->freq - b->freq;
 124 }
 125
 126 static int p54_fill_band_bitrates(struct ieee80211_hw *dev,
 127                                   struct ieee80211_supported_band *band_entry,
 128                                   enum ieee80211_band band)
 129 {
 130         /* TODO: generate rate array dynamically */
 131
 132         switch (band) {
 133         case IEEE80211_BAND_2GHZ:
 134                 band_entry->bitrates = p54_bgrates;
 135                 band_entry->n_bitrates = ARRAY_SIZE(p54_bgrates);
 136                 break;
 137         case IEEE80211_BAND_5GHZ:
 138                 band_entry->bitrates = p54_arates;
 139                 band_entry->n_bitrates = ARRAY_SIZE(p54_arates);
 140                 break;
 141         default:
 142                 return -EINVAL;
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int p54_generate_band(struct ieee80211_hw *dev,
 149                              struct p54_channel_list *list,
 150                              unsigned int *chan_num,
 151                              enum ieee80211_band band)
 152 {
 153         struct p54_common *priv = dev->priv;
 154         struct ieee80211_supported_band *tmp, *old;
 155         unsigned int i, j;
 156         int ret = -ENOMEM;
 157
 158         if ((!list->entries) || (!list->band_channel_num[band]))
 159                 return -EINVAL;
 160
 161         tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
 162         if (!tmp)
 163                 goto err_out;
 164
 165         tmp->channels = kzalloc(sizeof(struct ieee80211_channel) *
 166                                 list->band_channel_num[band], GFP_KERNEL);
 167         if (!tmp->channels)
 168                 goto err_out;
 169
 170         ret = p54_fill_band_bitrates(dev, tmp, band);
 171         if (ret)
 172                 goto err_out;
 173
 174         for (i = 0, j = 0; (j < list->band_channel_num[band]) &&
 175                            (i < list->entries); i++) {
 176                 struct p54_channel_entry *chan = &list->channels[i];
 177                 struct ieee80211_channel *dest = &tmp->channels[j];
 178
 179                 if (chan->band != band)
 180                         continue;
 181
 182                 if (chan->data != CHAN_HAS_ALL) {
 183                         wiphy_err(dev->wiphy, "%s%s%s is/are missing for "
 184                                   "channel:%d [%d MHz].\n",
 185                                   (chan->data & CHAN_HAS_CAL ? "" :
 186                                    " [iqauto calibration data]"),
 187                                   (chan->data & CHAN_HAS_LIMIT ? "" :
 188                                    " [output power limits]"),
 189                                   (chan->data & CHAN_HAS_CURVE ? "" :
 190                                    " [curve data]"),
 191                                   chan->index, chan->freq);
 192                         continue;
 193                 }
 194
 195                 dest->band = chan->band;
 196                 dest->center_freq = chan->freq;
 197                 dest->max_power = chan->max_power;
 198                 priv->survey[*chan_num].channel = &tmp->channels[j];
 199                 priv->survey[*chan_num].filled = SURVEY_INFO_NOISE_DBM |
 200                         SURVEY_INFO_CHANNEL_TIME |
 201                         SURVEY_INFO_CHANNEL_TIME_BUSY |
 202                         SURVEY_INFO_CHANNEL_TIME_TX;
 203                 dest->hw_value = (*chan_num);
 204                 j++;
 205                 (*chan_num)++;
 206         }
 207
 208         if (j == 0) {
 209                 wiphy_err(dev->wiphy, "Disabling totally damaged %d GHz band\n",
 210                           (band == IEEE80211_BAND_2GHZ) ? 2 : 5);
 211
 212                 ret = -ENODATA;
 213                 goto err_out;
 214         }
 215
 216         tmp->n_channels = j;
 217         old = priv->band_table[band];
 218         priv->band_table[band] = tmp;
 219         if (old) {
 220                 kfree(old->channels);
 221                 kfree(old);
 222         }
 223
 224         return 0;
 225
 226 err_out:
 227         if (tmp) {
 228                 kfree(tmp->channels);
 229                 kfree(tmp);
 230         }
 231
 232         return ret;
 233 }
 234
 235 static struct p54_channel_entry *p54_update_channel_param(struct p54_channel_list *list,
 236                                                           u16 freq, u16 data)
 237 {
 238         int i;
 239         struct p54_channel_entry *entry = NULL;
 240
 241         /*
 242          * usually all lists in the eeprom are mostly sorted.
 243          * so it's very likely that the entry we are looking for
 244          * is right at the end of the list
 245          */
 246         for (i = list->entries; i >= 0; i--) {
 247                 if (freq == list->channels[i].freq) {
 248                         entry = &list->channels[i];
 249                         break;
 250                 }
 251         }
 252
 253         if ((i < 0) && (list->entries < list->max_entries)) {
 254                 /* entry does not exist yet. Initialize a new one. */
 255                 int band = p54_get_band_from_freq(freq);
 256
 257                 /*
 258                  * filter out frequencies which don't belong into
 259                  * any supported band.
 260                  */
 261                 if (band >= 0) {
 262                         i = list->entries++;
 263                         list->band_channel_num[band]++;
 264
 265                         entry = &list->channels[i];
 266                         entry->freq = freq;
 267                         entry->band = band;
 268                         entry->index = ieee80211_frequency_to_channel(freq);
 269                         entry->max_power = 0;
 270                         entry->data = 0;
 271                 }
 272         }
 273
 274         if (entry)
 275                 entry->data |= data;
 276
 277         return entry;
 278 }
 279
 280 static int p54_get_maxpower(struct p54_common *priv, void *data)
 281 {
 282         switch (priv->rxhw & PDR_SYNTH_FRONTEND_MASK) {
 283         case PDR_SYNTH_FRONTEND_LONGBOW: {
 284                 struct pda_channel_output_limit_longbow *pda = data;
 285                 int j;
 286                 u16 rawpower = 0;
 287                 pda = data;
 288                 for (j = 0; j < ARRAY_SIZE(pda->point); j++) {
 289                         struct pda_channel_output_limit_point_longbow *point =
 290                                 &pda->point[j];
 291                         rawpower = max_t(u16,
 292                                 rawpower, le16_to_cpu(point->val_qpsk));
 293                         rawpower = max_t(u16,
 294                                 rawpower, le16_to_cpu(point->val_bpsk));
 295                         rawpower = max_t(u16,
 296                                 rawpower, le16_to_cpu(point->val_16qam));
 297                         rawpower = max_t(u16,
 298                                 rawpower, le16_to_cpu(point->val_64qam));
 299                 }
 300                 /* longbow seems to use 1/16 dBm units */
 301                 return rawpower / 16;
 302                 }
 303
 304         case PDR_SYNTH_FRONTEND_DUETTE3:
 305         case PDR_SYNTH_FRONTEND_DUETTE2:
 306         case PDR_SYNTH_FRONTEND_FRISBEE:
 307         case PDR_SYNTH_FRONTEND_XBOW: {
 308                 struct pda_channel_output_limit *pda = data;
 309                 u8 rawpower = 0;
 310                 rawpower = max(rawpower, pda->val_qpsk);
 311                 rawpower = max(rawpower, pda->val_bpsk);
 312                 rawpower = max(rawpower, pda->val_16qam);
 313                 rawpower = max(rawpower, pda->val_64qam);
 314                 /* raw values are in 1/4 dBm units */
 315                 return rawpower / 4;
 316                 }
 317
 318         default:
 319                 return 20;
 320         }
 321 }
 322
 323 static int p54_generate_channel_lists(struct ieee80211_hw *dev)
 324 {
 325         struct p54_common *priv = dev->priv;
 326         struct p54_channel_list *list;
 327         unsigned int i, j, k, max_channel_num;
 328         int ret = 0;
 329         u16 freq;
 330
 331         if ((priv->iq_autocal_len != priv->curve_data->entries) ||
 332             (priv->iq_autocal_len != priv->output_limit->entries))
 333                 wiphy_err(dev->wiphy,
 334                           "Unsupported or damaged EEPROM detected. "
 335                           "You may not be able to use all channels.\n");
 336
 337         max_channel_num = max_t(unsigned int, priv->output_limit->entries,
 338                                 priv->iq_autocal_len);
 339         max_channel_num = max_t(unsigned int, max_channel_num,
 340                                 priv->curve_data->entries);
 341
 342         list = kzalloc(sizeof(*list), GFP_KERNEL);
 343         if (!list) {
 344                 ret = -ENOMEM;
 345                 goto free;
 346         }
 347         priv->chan_num = max_channel_num;
 348         priv->survey = kzalloc(sizeof(struct survey_info) * max_channel_num,
 349                                GFP_KERNEL);
 350         if (!priv->survey) {
 351                 ret = -ENOMEM;
 352                 goto free;
 353         }
 354
 355         list->max_entries = max_channel_num;
 356         list->channels = kzalloc(sizeof(struct p54_channel_entry) *
 357                                  max_channel_num, GFP_KERNEL);
 358         if (!list->channels) {
 359                 ret = -ENOMEM;
 360                 goto free;
 361         }
 362
 363         for (i = 0; i < max_channel_num; i++) {
 364                 if (i < priv->iq_autocal_len) {
 365                         freq = le16_to_cpu(priv->iq_autocal[i].freq);
 366                         p54_update_channel_param(list, freq, CHAN_HAS_CAL);
 367                 }
 368
 369                 if (i < priv->output_limit->entries) {
 370                         struct p54_channel_entry *tmp;
 371
 372                         void *data = (void *) ((unsigned long) i *
 373                                 priv->output_limit->entry_size +
 374                                 priv->output_limit->offset +
 375                                 priv->output_limit->data);
 376
 377                         freq = le16_to_cpup((__le16 *) data);
 378                         tmp = p54_update_channel_param(list, freq,
 379                                                        CHAN_HAS_LIMIT);
 380                         if (tmp) {
 381                                 tmp->max_power = p54_get_maxpower(priv, data);
 382                         }
 383                 }
 384
 385                 if (i < priv->curve_data->entries) {
 386                         freq = le16_to_cpup((__le16 *) (i *
 387                                             priv->curve_data->entry_size +
 388                                             priv->curve_data->offset +
 389                                             priv->curve_data->data));
 390
 391                         p54_update_channel_param(list, freq, CHAN_HAS_CURVE);
 392                 }
 393         }
 394
 395         /* sort the channel list by frequency */
 396         sort(list->channels, list->entries, sizeof(struct p54_channel_entry),
 397              p54_compare_channels, NULL);
 398
 399         k = 0;
 400         for (i = 0, j = 0; i < IEEE80211_NUM_BANDS; i++) {
 401                 if (p54_generate_band(dev, list, &k, i) == 0)
 402                         j++;
 403         }
 404         if (j == 0) {
 405                 /* no useable band available. */
 406                 ret = -EINVAL;
 407         }
 408
 409 free:
 410         if (list) {
 411                 kfree(list->channels);
 412                 kfree(list);
 413         }
 414         if (ret) {
 415                 kfree(priv->survey);
 416                 priv->survey = NULL;
 417         }
 418
 419         return ret;
 420 }
 421
 422 static int p54_convert_rev0(struct ieee80211_hw *dev,
 423                             struct pda_pa_curve_data *curve_data)
 424 {
 425         struct p54_common *priv = dev->priv;
 426         struct p54_pa_curve_data_sample *dst;
 427         struct pda_pa_curve_data_sample_rev0 *src;
 428         size_t cd_len = sizeof(*curve_data) +
 429                 (curve_data->points_per_channel*sizeof(*dst) + 2) *
 430                  curve_data->channels;
 431         unsigned int i, j;
 432         void *source, *target;
 433
 434         priv->curve_data = kmalloc(sizeof(*priv->curve_data) + cd_len,
 435                                    GFP_KERNEL);
 436         if (!priv->curve_data)
 437                 return -ENOMEM;
 438
 439         priv->curve_data->entries = curve_data->channels;
 440         priv->curve_data->entry_size = sizeof(__le16) +
 441                 sizeof(*dst) * curve_data->points_per_channel;
 442         priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
 443         priv->curve_data->len = cd_len;
 444         memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
 445         source = curve_data->data;
 446         target = ((struct pda_pa_curve_data *) priv->curve_data->data)->data;
 447         for (i = 0; i < curve_data->channels; i++) {
 448                 __le16 *freq = source;
 449                 source += sizeof(__le16);
 450                 *((__le16 *)target) = *freq;
 451                 target += sizeof(__le16);
 452                 for (j = 0; j < curve_data->points_per_channel; j++) {
 453                         dst = target;
 454                         src = source;
 455
 456                         dst->rf_power = src->rf_power;
 457                         dst->pa_detector = src->pa_detector;
 458                         dst->data_64qam = src->pcv;
 459                         /* "invent" the points for the other modulations */
 460 #define SUB(x, y) (u8)(((x) - (y)) > (x) ? 0 : (x) - (y))
 461                         dst->data_16qam = SUB(src->pcv, 12);
 462                         dst->data_qpsk = SUB(dst->data_16qam, 12);
 463                         dst->data_bpsk = SUB(dst->data_qpsk, 12);
 464                         dst->data_barker = SUB(dst->data_bpsk, 14);
 465 #undef SUB
 466                         target += sizeof(*dst);
 467                         source += sizeof(*src);
 468                 }
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int p54_convert_rev1(struct ieee80211_hw *dev,
 475                             struct pda_pa_curve_data *curve_data)
 476 {
 477         struct p54_common *priv = dev->priv;
 478         struct p54_pa_curve_data_sample *dst;
 479         struct pda_pa_curve_data_sample_rev1 *src;
 480         size_t cd_len = sizeof(*curve_data) +
 481                 (curve_data->points_per_channel*sizeof(*dst) + 2) *
 482                  curve_data->channels;
 483         unsigned int i, j;
 484         void *source, *target;
 485
 486         priv->curve_data = kzalloc(cd_len + sizeof(*priv->curve_data),
 487                                    GFP_KERNEL);
 488         if (!priv->curve_data)
 489                 return -ENOMEM;
 490
 491         priv->curve_data->entries = curve_data->channels;
 492         priv->curve_data->entry_size = sizeof(__le16) +
 493                 sizeof(*dst) * curve_data->points_per_channel;
 494         priv->curve_data->offset = offsetof(struct pda_pa_curve_data, data);
 495         priv->curve_data->len = cd_len;
 496         memcpy(priv->curve_data->data, curve_data, sizeof(*curve_data));
 497         source = curve_data->data;
 498         target = ((struct pda_pa_curve_data *) priv->curve_data->data)->data;
 499         for (i = 0; i < curve_data->channels; i++) {
 500                 __le16 *freq = source;
 501                 source += sizeof(__le16);
 502                 *((__le16 *)target) = *freq;
 503                 target += sizeof(__le16);
 504                 for (j = 0; j < curve_data->points_per_channel; j++) {
 505                         memcpy(target, source, sizeof(*src));
 506
 507                         target += sizeof(*dst);
 508                         source += sizeof(*src);
 509                 }
 510                 source++;
 511         }
 512
 513         return 0;
 514 }
 515
 516 static const char *p54_rf_chips[] = { "INVALID-0", "Duette3", "Duette2",
 517         "Frisbee", "Xbow", "Longbow", "INVALID-6", "INVALID-7" };
 518
 519 static int p54_parse_rssical(struct ieee80211_hw *dev,
 520                              u8 *data, int len, u16 type)
 521 {
 522         struct p54_common *priv = dev->priv;
 523         struct p54_rssi_db_entry *entry;
 524         size_t db_len, entries;
 525         int offset = 0, i;
 526
 527         if (type != PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
 528                 entries = (type == PDR_RSSI_LINEAR_APPROXIMATION) ? 1 : 2;
 529                 if (len != sizeof(struct pda_rssi_cal_entry) * entries) {
 530                         wiphy_err(dev->wiphy, "rssical size mismatch.\n");
 531                         goto err_data;
 532                 }
 533         } else {
 534                 /*
 535                  * Some devices (Dell 1450 USB, Xbow 5GHz card, etc...)
 536                  * have an empty two byte header.
 537                  */
 538                 if (*((__le16 *)&data[offset]) == cpu_to_le16(0))
 539                         offset += 2;
 540
 541                 entries = (len - offset) /
 542                         sizeof(struct pda_rssi_cal_ext_entry);
 543
 544                 if (len < offset ||
 545                     (len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
 546                     entries == 0) {
 547                         wiphy_err(dev->wiphy, "invalid rssi database.\n");
 548                         goto err_data;
 549                 }
 550         }
 551
 552         db_len = sizeof(*entry) * entries;
 553         priv->rssi_db = kzalloc(db_len + sizeof(*priv->rssi_db), GFP_KERNEL);
 554         if (!priv->rssi_db)
 555                 return -ENOMEM;
 556
 557         priv->rssi_db->offset = 0;
 558         priv->rssi_db->entries = entries;
 559         priv->rssi_db->entry_size = sizeof(*entry);
 560         priv->rssi_db->len = db_len;
 561
 562         entry = (void *)((unsigned long)priv->rssi_db->data + priv->rssi_db->offset);
 563         if (type == PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) {
 564                 struct pda_rssi_cal_ext_entry *cal = (void *) &data[offset];
 565
 566                 for (i = 0; i < entries; i++) {
 567                         entry[i].freq = le16_to_cpu(cal[i].freq);
 568                         entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
 569                         entry[i].add = (s16) le16_to_cpu(cal[i].add);
 570                 }
 571         } else {
 572                 struct pda_rssi_cal_entry *cal = (void *) &data[offset];
 573
 574                 for (i = 0; i < entries; i++) {
 575                         u16 freq = 0;
 576                         switch (i) {
 577                         case IEEE80211_BAND_2GHZ:
 578                                 freq = 2437;
 579                                 break;
 580                         case IEEE80211_BAND_5GHZ:
 581                                 freq = 5240;
 582                                 break;
 583                         }
 584
 585                         entry[i].freq = freq;
 586                         entry[i].mul = (s16) le16_to_cpu(cal[i].mul);
 587                         entry[i].add = (s16) le16_to_cpu(cal[i].add);
 588                 }
 589         }
 590
 591         /* sort the list by channel frequency */
 592         sort(entry, entries, sizeof(*entry), p54_compare_rssichan, NULL);
 593         return 0;
 594
 595 err_data:
 596         wiphy_err(dev->wiphy,
 597                   "rssi calibration data packing type:(%x) len:%d.\n",
 598                   type, len);
 599
 600         print_hex_dump_bytes("rssical:", DUMP_PREFIX_NONE, data, len);
 601
 602         wiphy_err(dev->wiphy, "please report this issue.\n");
 603         return -EINVAL;
 604 }
 605
 606 struct p54_rssi_db_entry *p54_rssi_find(struct p54_common *priv, const u16 freq)
 607 {
 608         struct p54_rssi_db_entry *entry;
 609         int i, found = -1;
 610
 611         if (!priv->rssi_db)
 612                 return &p54_rssi_default;
 613
 614         entry = (void *)(priv->rssi_db->data + priv->rssi_db->offset);
 615         for (i = 0; i < priv->rssi_db->entries; i++) {
 616                 if (!same_band(freq, entry[i].freq))
 617                         continue;
 618
 619                 if (found == -1) {
 620                         found = i;
 621                         continue;
 622                 }
 623
 624                 /* nearest match */
 625                 if (abs(freq - entry[i].freq) <
 626                     abs(freq - entry[found].freq)) {
 627                         found = i;
 628                         continue;
 629                 } else {
 630                         break;
 631                 }
 632         }
 633
 634         return found < 0 ? &p54_rssi_default : &entry[found];
 635 }
 636
 637 static void p54_parse_default_country(struct ieee80211_hw *dev,
 638                                       void *data, int len)
 639 {
 640         struct pda_country *country;
 641
 642         if (len != sizeof(*country)) {
 643                 wiphy_err(dev->wiphy,
 644                           "found possible invalid default country eeprom entry. (entry size: %d)\n",
 645                           len);
 646
 647                 print_hex_dump_bytes("country:", DUMP_PREFIX_NONE,
 648                                      data, len);
 649
 650                 wiphy_err(dev->wiphy, "please report this issue.\n");
 651                 return;
 652         }
 653
 654         country = (struct pda_country *) data;
 655         if (country->flags == PDR_COUNTRY_CERT_CODE_PSEUDO)
 656                 regulatory_hint(dev->wiphy, country->alpha2);
 657         else {
 658                 /* TODO:
 659                  * write a shared/common function that converts
 660                  * "Regulatory domain codes" (802.11-2007 14.8.2.2)
 661                  * into ISO/IEC 3166-1 alpha2 for regulatory_hint.
 662                  */
 663         }
 664 }
 665
 666 static int p54_convert_output_limits(struct ieee80211_hw *dev,
 667                                      u8 *data, size_t len)
 668 {
 669         struct p54_common *priv = dev->priv;
 670
 671         if (len < 2)
 672                 return -EINVAL;
 673
 674         if (data[0] != 0) {
 675                 wiphy_err(dev->wiphy, "unknown output power db revision:%x\n",
 676                           data[0]);
 677                 return -EINVAL;
 678         }
 679
 680         if (2 + data[1] * sizeof(struct pda_channel_output_limit) > len)
 681                 return -EINVAL;
 682
 683         priv->output_limit = kmalloc(data[1] *
 684                 sizeof(struct pda_channel_output_limit) +
 685                 sizeof(*priv->output_limit), GFP_KERNEL);
 686
 687         if (!priv->output_limit)
 688                 return -ENOMEM;
 689
 690         priv->output_limit->offset = 0;
 691         priv->output_limit->entries = data[1];
 692         priv->output_limit->entry_size =
 693                 sizeof(struct pda_channel_output_limit);
 694         priv->output_limit->len = priv->output_limit->entry_size *
 695                                   priv->output_limit->entries +
 696                                   priv->output_limit->offset;
 697
 698         memcpy(priv->output_limit->data, &data[2],
 699                data[1] * sizeof(struct pda_channel_output_limit));
 700
 701         return 0;
 702 }
 703
 704 static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
 705                                                size_t total_len)
 706 {
 707         struct p54_cal_database *dst;
 708         size_t payload_len, entries, entry_size, offset;
 709
 710         payload_len = le16_to_cpu(src->len);
 711         entries = le16_to_cpu(src->entries);
 712         entry_size = le16_to_cpu(src->entry_size);
 713         offset = le16_to_cpu(src->offset);
 714         if (((entries * entry_size + offset) != payload_len) ||
 715              (payload_len + sizeof(*src) != total_len))
 716                 return NULL;
 717
 718         dst = kmalloc(sizeof(*dst) + payload_len, GFP_KERNEL);
 719         if (!dst)
 720                 return NULL;
 721
 722         dst->entries = entries;
 723         dst->entry_size = entry_size;
 724         dst->offset = offset;
 725         dst->len = payload_len;
 726
 727         memcpy(dst->data, src->data, payload_len);
 728         return dst;
 729 }
 730
 731 int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
 732 {
 733         struct p54_common *priv = dev->priv;
 734         struct eeprom_pda_wrap *wrap;
 735         struct pda_entry *entry;
 736         unsigned int data_len, entry_len;
 737         void *tmp;
 738         int err;
 739         u8 *end = (u8 *)eeprom + len;
 740         u16 synth = 0;
 741         u16 crc16 = ~0;
 742
 743         wrap = (struct eeprom_pda_wrap *) eeprom;
 744         entry = (void *)wrap->data + le16_to_cpu(wrap->len);
 745
 746         /* verify that at least the entry length/code fits */
 747         while ((u8 *)entry <= end - sizeof(*entry)) {
 748                 entry_len = le16_to_cpu(entry->len);
 749                 data_len = ((entry_len - 1) << 1);
 750
 751                 /* abort if entry exceeds whole structure */
 752                 if ((u8 *)entry + sizeof(*entry) + data_len > end)
 753                         break;
 754
 755                 switch (le16_to_cpu(entry->code)) {
 756                 case PDR_MAC_ADDRESS:
 757                         if (data_len != ETH_ALEN)
 758                                 break;
 759                         SET_IEEE80211_PERM_ADDR(dev, entry->data);
 760                         break;
 761                 case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
 762                         if (priv->output_limit)
 763                                 break;
 764                         err = p54_convert_output_limits(dev, entry->data,
 765                                                         data_len);
 766                         if (err)
 767                                 goto err;
 768                         break;
 769                 case PDR_PRISM_PA_CAL_CURVE_DATA: {
 770                         struct pda_pa_curve_data *curve_data =
 771                                 (struct pda_pa_curve_data *)entry->data;
 772                         if (data_len < sizeof(*curve_data)) {
 773                                 err = -EINVAL;
 774                                 goto err;
 775                         }
 776
 777                         switch (curve_data->cal_method_rev) {
 778                         case 0:
 779                                 err = p54_convert_rev0(dev, curve_data);
 780                                 break;
 781                         case 1:
 782                                 err = p54_convert_rev1(dev, curve_data);
 783                                 break;
 784                         default:
 785                                 wiphy_err(dev->wiphy,
 786                                           "unknown curve data revision %d\n",
 787                                           curve_data->cal_method_rev);
 788                                 err = -ENODEV;
 789                                 break;
 790                         }
 791                         if (err)
 792                                 goto err;
 793                         }
 794                         break;
 795                 case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
 796                         priv->iq_autocal = kmemdup(entry->data, data_len,
 797                                                    GFP_KERNEL);
 798                         if (!priv->iq_autocal) {
 799                                 err = -ENOMEM;
 800                                 goto err;
 801                         }
 802
 803                         priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
 804                         break;
 805                 case PDR_DEFAULT_COUNTRY:
 806                         p54_parse_default_country(dev, entry->data, data_len);
 807                         break;
 808                 case PDR_INTERFACE_LIST:
 809                         tmp = entry->data;
 810                         while ((u8 *)tmp < entry->data + data_len) {
 811                                 struct exp_if *exp_if = tmp;
 812                                 if (exp_if->if_id == cpu_to_le16(IF_ID_ISL39000))
 813                                         synth = le16_to_cpu(exp_if->variant);
 814                                 tmp += sizeof(*exp_if);
 815                         }
 816                         break;
 817                 case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
 818                         if (data_len < 2)
 819                                 break;
 820                         priv->version = *(u8 *)(entry->data + 1);
 821                         break;
 822                 case PDR_RSSI_LINEAR_APPROXIMATION:
 823                 case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND:
 824                 case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED:
 825                         err = p54_parse_rssical(dev, entry->data, data_len,
 826                                                 le16_to_cpu(entry->code));
 827                         if (err)
 828                                 goto err;
 829                         break;
 830                 case PDR_RSSI_LINEAR_APPROXIMATION_CUSTOMV2: {
 831                         struct pda_custom_wrapper *pda = (void *) entry->data;
 832                         __le16 *src;
 833                         u16 *dst;
 834                         int i;
 835
 836                         if (priv->rssi_db || data_len < sizeof(*pda))
 837                                 break;
 838
 839                         priv->rssi_db = p54_convert_db(pda, data_len);
 840                         if (!priv->rssi_db)
 841                                 break;
 842
 843                         src = (void *) priv->rssi_db->data;
 844                         dst = (void *) priv->rssi_db->data;
 845
 846                         for (i = 0; i < priv->rssi_db->entries; i++)
 847                                 *(dst++) = (s16) le16_to_cpu(*(src++));
 848
 849                         }
 850                         break;
 851                 case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS_CUSTOM: {
 852                         struct pda_custom_wrapper *pda = (void *) entry->data;
 853                         if (priv->output_limit || data_len < sizeof(*pda))
 854                                 break;
 855                         priv->output_limit = p54_convert_db(pda, data_len);
 856                         }
 857                         break;
 858                 case PDR_PRISM_PA_CAL_CURVE_DATA_CUSTOM: {
 859                         struct pda_custom_wrapper *pda = (void *) entry->data;
 860                         if (priv->curve_data || data_len < sizeof(*pda))
 861                                 break;
 862                         priv->curve_data = p54_convert_db(pda, data_len);
 863                         }
 864                         break;
 865                 case PDR_END:
 866                         crc16 = ~crc_ccitt(crc16, (u8 *) entry, sizeof(*entry));
 867                         if (crc16 != le16_to_cpup((__le16 *)entry->data)) {
 868                                 wiphy_err(dev->wiphy, "eeprom failed checksum "
 869                                          "test!\n");
 870                                 err = -ENOMSG;
 871                                 goto err;
 872                         } else {
 873                                 goto good_eeprom;
 874                         }
 875                         break;
 876                 default:
 877                         break;
 878                 }
 879
 880                 crc16 = crc_ccitt(crc16, (u8 *)entry, (entry_len + 1) * 2);
 881                 entry = (void *)entry + (entry_len + 1) * 2;
 882         }
 883
 884         wiphy_err(dev->wiphy, "unexpected end of eeprom data.\n");
 885         err = -ENODATA;
 886         goto err;
 887
 888 good_eeprom:
 889         if (!synth || !priv->iq_autocal || !priv->output_limit ||
 890             !priv->curve_data) {
 891                 wiphy_err(dev->wiphy,
 892                           "not all required entries found in eeprom!\n");
 893                 err = -EINVAL;
 894                 goto err;
 895         }
 896
 897         priv->rxhw = synth & PDR_SYNTH_FRONTEND_MASK;
 898
 899         err = p54_generate_channel_lists(dev);
 900         if (err)
 901                 goto err;
 902
 903         if (priv->rxhw == PDR_SYNTH_FRONTEND_XBOW)
 904                 p54_init_xbow_synth(priv);
 905         if (!(synth & PDR_SYNTH_24_GHZ_DISABLED))
 906                 dev->wiphy->bands[IEEE80211_BAND_2GHZ] =
 907                         priv->band_table[IEEE80211_BAND_2GHZ];
 908         if (!(synth & PDR_SYNTH_5_GHZ_DISABLED))
 909                 dev->wiphy->bands[IEEE80211_BAND_5GHZ] =
 910                         priv->band_table[IEEE80211_BAND_5GHZ];
 911         if ((synth & PDR_SYNTH_RX_DIV_MASK) == PDR_SYNTH_RX_DIV_SUPPORTED)
 912                 priv->rx_diversity_mask = 3;
 913         if ((synth & PDR_SYNTH_TX_DIV_MASK) == PDR_SYNTH_TX_DIV_SUPPORTED)
 914                 priv->tx_diversity_mask = 3;
 915
 916         if (!is_valid_ether_addr(dev->wiphy->perm_addr)) {
 917                 u8 perm_addr[ETH_ALEN];
 918
 919                 wiphy_warn(dev->wiphy,
 920                            "Invalid hwaddr! Using randomly generated MAC addr\n");
 921                 eth_random_addr(perm_addr);
 922                 SET_IEEE80211_PERM_ADDR(dev, perm_addr);
 923         }
 924
 925         priv->cur_rssi = &p54_rssi_default;
 926
 927         wiphy_info(dev->wiphy, "hwaddr %pM, MAC:isl38%02x RF:%s\n",
 928                    dev->wiphy->perm_addr, priv->version,
 929                    p54_rf_chips[priv->rxhw]);
 930
 931         return 0;
 932
 933 err:
 934         kfree(priv->iq_autocal);
 935         kfree(priv->output_limit);
 936         kfree(priv->curve_data);
 937         kfree(priv->rssi_db);
 938         kfree(priv->survey);
 939         priv->iq_autocal = NULL;
 940         priv->output_limit = NULL;
 941         priv->curve_data = NULL;
 942         priv->rssi_db = NULL;
 943         priv->survey = NULL;
 944
 945         wiphy_err(dev->wiphy, "eeprom parse failed!\n");
 946         return err;
 947 }
 948 EXPORT_SYMBOL_GPL(p54_parse_eeprom);
 949
 950 int p54_read_eeprom(struct ieee80211_hw *dev)
 951 {
 952         struct p54_common *priv = dev->priv;
 953         size_t eeprom_size = 0x2020, offset = 0, blocksize, maxblocksize;
 954         int ret = -ENOMEM;
 955         void *eeprom;
 956
 957         maxblocksize = EEPROM_READBACK_LEN;
 958         if (priv->fw_var >= 0x509)
 959                 maxblocksize -= 0xc;
 960         else
 961                 maxblocksize -= 0x4;
 962
 963         eeprom = kzalloc(eeprom_size, GFP_KERNEL);
 964         if (unlikely(!eeprom))
 965                 goto free;
 966
 967         while (eeprom_size) {
 968                 blocksize = min(eeprom_size, maxblocksize);
 969                 ret = p54_download_eeprom(priv, eeprom + offset,
 970                                           offset, blocksize);
 971                 if (unlikely(ret))
 972                         goto free;
 973
 974                 offset += blocksize;
 975                 eeprom_size -= blocksize;
 976         }
 977
 978         ret = p54_parse_eeprom(dev, eeprom, offset);
 979 free:
 980         kfree(eeprom);
 981         return ret;
 982 }
 983 EXPORT_SYMBOL_GPL(p54_read_eeprom);