SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/p54/p54common.c

   1
   2 /*
   3  * Common code for mac80211 Prism54 drivers
   4  *
   5  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   6  * Copyright (c) 2007, Christian Lamparter <chunkeey@web.de>
   7  *
   8  * Based on the islsm (softmac prism54) driver, which is:
   9  * Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/firmware.h>
  18 #include <linux/etherdevice.h>
  19
  20 #include <net/mac80211.h>
  21
  22 #include "p54.h"
  23 #include "p54common.h"
  24
  25 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
  26 MODULE_DESCRIPTION("Softmac Prism54 common code");
  27 MODULE_LICENSE("GPL");
  28 MODULE_ALIAS("prism54common");
  29
  30 static struct ieee80211_rate p54_rates[] = {
  31         { .bitrate = 10, .hw_value = 0, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  32         { .bitrate = 20, .hw_value = 1, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  33         { .bitrate = 55, .hw_value = 2, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  34         { .bitrate = 110, .hw_value = 3, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
  35         { .bitrate = 60, .hw_value = 4, },
  36         { .bitrate = 90, .hw_value = 5, },
  37         { .bitrate = 120, .hw_value = 6, },
  38         { .bitrate = 180, .hw_value = 7, },
  39         { .bitrate = 240, .hw_value = 8, },
  40         { .bitrate = 360, .hw_value = 9, },
  41         { .bitrate = 480, .hw_value = 10, },
  42         { .bitrate = 540, .hw_value = 11, },
  43 };
  44
  45 static struct ieee80211_channel p54_channels[] = {
  46         { .center_freq = 2412, .hw_value = 1, },
  47         { .center_freq = 2417, .hw_value = 2, },
  48         { .center_freq = 2422, .hw_value = 3, },
  49         { .center_freq = 2427, .hw_value = 4, },
  50         { .center_freq = 2432, .hw_value = 5, },
  51         { .center_freq = 2437, .hw_value = 6, },
  52         { .center_freq = 2442, .hw_value = 7, },
  53         { .center_freq = 2447, .hw_value = 8, },
  54         { .center_freq = 2452, .hw_value = 9, },
  55         { .center_freq = 2457, .hw_value = 10, },
  56         { .center_freq = 2462, .hw_value = 11, },
  57         { .center_freq = 2467, .hw_value = 12, },
  58         { .center_freq = 2472, .hw_value = 13, },
  59         { .center_freq = 2484, .hw_value = 14, },
  60 };
  61
  62 static struct ieee80211_supported_band band_2GHz = {
  63         .channels = p54_channels,
  64         .n_channels = ARRAY_SIZE(p54_channels),
  65         .bitrates = p54_rates,
  66         .n_bitrates = ARRAY_SIZE(p54_rates),
  67 };
  68
  69 int p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw)
  70 {
  71         struct p54_common *priv = dev->priv;
  72         struct bootrec_exp_if *exp_if;
  73         struct bootrec *bootrec;
  74         u32 *data = (u32 *)fw->data;
  75         u32 *end_data = (u32 *)fw->data + (fw->size >> 2);
  76         u8 *fw_version = NULL;
  77         size_t len;
  78         int i;
  79
  80         if (priv->rx_start)
  81                 return 0;
  82
  83         while (data < end_data && *data)
  84                 data++;
  85
  86         while (data < end_data && !*data)
  87                 data++;
  88
  89         bootrec = (struct bootrec *) data;
  90
  91         while (bootrec->data <= end_data &&
  92                (bootrec->data + (len = le32_to_cpu(bootrec->len))) <= end_data) {
  93                 u32 code = le32_to_cpu(bootrec->code);
  94                 switch (code) {
  95                 case BR_CODE_COMPONENT_ID:
  96                         switch (be32_to_cpu(*(__be32 *)bootrec->data)) {
  97                         case FW_FMAC:
  98                                 printk(KERN_INFO "p54: FreeMAC firmware\n");
  99                                 break;
 100                         case FW_LM20:
 101                                 printk(KERN_INFO "p54: LM20 firmware\n");
 102                                 break;
 103                         case FW_LM86:
 104                                 printk(KERN_INFO "p54: LM86 firmware\n");
 105                                 break;
 106                         case FW_LM87:
 107                                 printk(KERN_INFO "p54: LM87 firmware - not supported yet!\n");
 108                                 break;
 109                         default:
 110                                 printk(KERN_INFO "p54: unknown firmware\n");
 111                                 break;
 112                         }
 113                         break;
 114                 case BR_CODE_COMPONENT_VERSION:
 115                         /* 24 bytes should be enough for all firmwares */
 116                         if (strnlen((unsigned char*)bootrec->data, 24) < 24)
 117                                 fw_version = (unsigned char*)bootrec->data;
 118                         break;
 119                 case BR_CODE_DESCR: {
 120                         struct bootrec_desc *desc =
 121                                 (struct bootrec_desc *)bootrec->data;
 122                         priv->rx_start = le32_to_cpu(desc->rx_start);
 123                         /* FIXME add sanity checking */
 124                         priv->rx_end = le32_to_cpu(desc->rx_end) - 0x3500;
 125                         priv->headroom = desc->headroom;
 126                         priv->tailroom = desc->tailroom;
 127                         if (bootrec->len == 11)
 128                                 priv->rx_mtu = (size_t) le16_to_cpu(
 129                                         (__le16)bootrec->data[10]);
 130                         else
 131                                 priv->rx_mtu = (size_t)
 132                                         0x620 - priv->tx_hdr_len;
 133                         break;
 134                         }
 135                 case BR_CODE_EXPOSED_IF:
 136                         exp_if = (struct bootrec_exp_if *) bootrec->data;
 137                         for (i = 0; i < (len * sizeof(*exp_if) / 4); i++)
 138                                 if (exp_if[i].if_id == cpu_to_le16(0x1a))
 139                                         priv->fw_var = le16_to_cpu(exp_if[i].variant);
 140                         break;
 141                 case BR_CODE_DEPENDENT_IF:
 142                         break;
 143                 case BR_CODE_END_OF_BRA:
 144                 case LEGACY_BR_CODE_END_OF_BRA:
 145                         end_data = NULL;
 146                         break;
 147                 default:
 148                         break;
 149                 }
 150                 bootrec = (struct bootrec *)&bootrec->data[len];
 151         }
 152
 153         if (fw_version)
 154                 printk(KERN_INFO "p54: FW rev %s - Softmac protocol %x.%x\n",
 155                         fw_version, priv->fw_var >> 8, priv->fw_var & 0xff);
 156
 157         if (priv->fw_var >= 0x300) {
 158                 /* Firmware supports QoS, use it! */
 159                 priv->tx_stats[4].limit = 3;
 160                 priv->tx_stats[5].limit = 4;
 161                 priv->tx_stats[6].limit = 3;
 162                 priv->tx_stats[7].limit = 1;
 163                 dev->queues = 4;
 164         }
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL_GPL(p54_parse_firmware);
 169
 170 static int p54_convert_rev0(struct ieee80211_hw *dev,
 171                             struct pda_pa_curve_data *curve_data)
 172 {
 173         struct p54_common *priv = dev->priv;
 174         struct p54_pa_curve_data_sample *dst;
 175         struct pda_pa_curve_data_sample_rev0 *src;
 176         size_t cd_len = sizeof(*curve_data) +
 177                 (curve_data->points_per_channel*sizeof(*dst) + 2) *
 178                  curve_data->channels;
 179         unsigned int i, j;
 180         void *source, *target;
 181
 182         priv->curve_data = kmalloc(cd_len, GFP_KERNEL);
 183         if (!priv->curve_data)
 184                 return -ENOMEM;
 185
 186         memcpy(priv->curve_data, curve_data, sizeof(*curve_data));
 187         source = curve_data->data;
 188         target = priv->curve_data->data;
 189         for (i = 0; i < curve_data->channels; i++) {
 190                 __le16 *freq = source;
 191                 source += sizeof(__le16);
 192                 *((__le16 *)target) = *freq;
 193                 target += sizeof(__le16);
 194                 for (j = 0; j < curve_data->points_per_channel; j++) {
 195                         dst = target;
 196                         src = source;
 197
 198                         dst->rf_power = src->rf_power;
 199                         dst->pa_detector = src->pa_detector;
 200                         dst->data_64qam = src->pcv;
 201                         /* "invent" the points for the other modulations */
 202 #define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y)
 203                         dst->data_16qam = SUB(src->pcv, 12);
 204                         dst->data_qpsk = SUB(dst->data_16qam, 12);
 205                         dst->data_bpsk = SUB(dst->data_qpsk, 12);
 206                         dst->data_barker = SUB(dst->data_bpsk, 14);
 207 #undef SUB
 208                         target += sizeof(*dst);
 209                         source += sizeof(*src);
 210                 }
 211         }
 212
 213         return 0;
 214 }
 215
 216 static int p54_convert_rev1(struct ieee80211_hw *dev,
 217                             struct pda_pa_curve_data *curve_data)
 218 {
 219         struct p54_common *priv = dev->priv;
 220         struct p54_pa_curve_data_sample *dst;
 221         struct pda_pa_curve_data_sample_rev1 *src;
 222         size_t cd_len = sizeof(*curve_data) +
 223                 (curve_data->points_per_channel*sizeof(*dst) + 2) *
 224                  curve_data->channels;
 225         unsigned int i, j;
 226         void *source, *target;
 227
 228         priv->curve_data = kmalloc(cd_len, GFP_KERNEL);
 229         if (!priv->curve_data)
 230                 return -ENOMEM;
 231
 232         memcpy(priv->curve_data, curve_data, sizeof(*curve_data));
 233         source = curve_data->data;
 234         target = priv->curve_data->data;
 235         for (i = 0; i < curve_data->channels; i++) {
 236                 __le16 *freq = source;
 237                 source += sizeof(__le16);
 238                 *((__le16 *)target) = *freq;
 239                 target += sizeof(__le16);
 240                 for (j = 0; j < curve_data->points_per_channel; j++) {
 241                         memcpy(target, source, sizeof(*src));
 242
 243                         target += sizeof(*dst);
 244                         source += sizeof(*src);
 245                 }
 246                 source++;
 247         }
 248
 249         return 0;
 250 }
 251
 252 int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
 253 {
 254         struct p54_common *priv = dev->priv;
 255         struct eeprom_pda_wrap *wrap = NULL;
 256         struct pda_entry *entry;
 257         unsigned int data_len, entry_len;
 258         void *tmp;
 259         int err;
 260         u8 *end = (u8 *)eeprom + len;
 261
 262         wrap = (struct eeprom_pda_wrap *) eeprom;
 263         entry = (void *)wrap->data + le16_to_cpu(wrap->len);
 264
 265         /* verify that at least the entry length/code fits */
 266         while ((u8 *)entry <= end - sizeof(*entry)) {
 267                 entry_len = le16_to_cpu(entry->len);
 268                 data_len = ((entry_len - 1) << 1);
 269
 270                 /* abort if entry exceeds whole structure */
 271                 if ((u8 *)entry + sizeof(*entry) + data_len > end)
 272                         break;
 273
 274                 switch (le16_to_cpu(entry->code)) {
 275                 case PDR_MAC_ADDRESS:
 276                         SET_IEEE80211_PERM_ADDR(dev, entry->data);
 277                         break;
 278                 case PDR_PRISM_PA_CAL_OUTPUT_POWER_LIMITS:
 279                         if (data_len < 2) {
 280                                 err = -EINVAL;
 281                                 goto err;
 282                         }
 283
 284                         if (2 + entry->data[1]*sizeof(*priv->output_limit) > data_len) {
 285                                 err = -EINVAL;
 286                                 goto err;
 287                         }
 288
 289                         priv->output_limit = kmalloc(entry->data[1] *
 290                                 sizeof(*priv->output_limit), GFP_KERNEL);
 291
 292                         if (!priv->output_limit) {
 293                                 err = -ENOMEM;
 294                                 goto err;
 295                         }
 296
 297                         memcpy(priv->output_limit, &entry->data[2],
 298                                entry->data[1]*sizeof(*priv->output_limit));
 299                         priv->output_limit_len = entry->data[1];
 300                         break;
 301                 case PDR_PRISM_PA_CAL_CURVE_DATA: {
 302                         struct pda_pa_curve_data *curve_data =
 303                                 (struct pda_pa_curve_data *)entry->data;
 304                         if (data_len < sizeof(*curve_data)) {
 305                                 err = -EINVAL;
 306                                 goto err;
 307                         }
 308
 309                         switch (curve_data->cal_method_rev) {
 310                         case 0:
 311                                 err = p54_convert_rev0(dev, curve_data);
 312                                 break;
 313                         case 1:
 314                                 err = p54_convert_rev1(dev, curve_data);
 315                                 break;
 316                         default:
 317                                 printk(KERN_ERR "p54: unknown curve data "
 318                                                 "revision %d\n",
 319                                                 curve_data->cal_method_rev);
 320                                 err = -ENODEV;
 321                                 break;
 322                         }
 323                         if (err)
 324                                 goto err;
 325
 326                 }
 327                 case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
 328                         priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
 329                         if (!priv->iq_autocal) {
 330                                 err = -ENOMEM;
 331                                 goto err;
 332                         }
 333
 334                         memcpy(priv->iq_autocal, entry->data, data_len);
 335                         priv->iq_autocal_len = data_len / sizeof(struct pda_iq_autocal_entry);
 336                         break;
 337                 case PDR_INTERFACE_LIST:
 338                         tmp = entry->data;
 339                         while ((u8 *)tmp < entry->data + data_len) {
 340                                 struct bootrec_exp_if *exp_if = tmp;
 341                                 if (le16_to_cpu(exp_if->if_id) == 0xF)
 342                                         priv->rxhw = exp_if->variant & cpu_to_le16(0x07);
 343                                 tmp += sizeof(struct bootrec_exp_if);
 344                         }
 345                         break;
 346                 case PDR_HARDWARE_PLATFORM_COMPONENT_ID:
 347                         priv->version = *(u8 *)(entry->data + 1);
 348                         break;
 349                 case PDR_END:
 350                         /* make it overrun */
 351                         entry_len = len;
 352                         break;
 353                 default:
 354                         printk(KERN_INFO "p54: unknown eeprom code : 0x%x\n",
 355                                 le16_to_cpu(entry->code));
 356                         break;
 357                 }
 358
 359                 entry = (void *)entry + (entry_len + 1)*2;
 360         }
 361
 362         if (!priv->iq_autocal || !priv->output_limit || !priv->curve_data) {
 363                 printk(KERN_ERR "p54: not all required entries found in eeprom!\n");
 364                 err = -EINVAL;
 365                 goto err;
 366         }
 367
 368         return 0;
 369
 370   err:
 371         if (priv->iq_autocal) {
 372                 kfree(priv->iq_autocal);
 373                 priv->iq_autocal = NULL;
 374         }
 375
 376         if (priv->output_limit) {
 377                 kfree(priv->output_limit);
 378                 priv->output_limit = NULL;
 379         }
 380
 381         if (priv->curve_data) {
 382                 kfree(priv->curve_data);
 383                 priv->curve_data = NULL;
 384         }
 385
 386         printk(KERN_ERR "p54: eeprom parse failed!\n");
 387         return err;
 388 }
 389 EXPORT_SYMBOL_GPL(p54_parse_eeprom);
 390
 391 void p54_fill_eeprom_readback(struct p54_control_hdr *hdr)
 392 {
 393         struct p54_eeprom_lm86 *eeprom_hdr;
 394
 395         hdr->magic1 = cpu_to_le16(0x8000);
 396         hdr->len = cpu_to_le16(sizeof(*eeprom_hdr) + 0x2000);
 397         hdr->type = cpu_to_le16(P54_CONTROL_TYPE_EEPROM_READBACK);
 398         hdr->retry1 = hdr->retry2 = 0;
 399         eeprom_hdr = (struct p54_eeprom_lm86 *) hdr->data;
 400         eeprom_hdr->offset = 0x0;
 401         eeprom_hdr->len = cpu_to_le16(0x2000);
 402 }
 403 EXPORT_SYMBOL_GPL(p54_fill_eeprom_readback);
 404
 405 static void p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb)
 406 {
 407         struct p54_rx_hdr *hdr = (struct p54_rx_hdr *) skb->data;
 408         struct ieee80211_rx_status rx_status = {0};
 409         u16 freq = le16_to_cpu(hdr->freq);
 410
 411         rx_status.signal = hdr->rssi;
 412         /* XX correct? */
 413         rx_status.qual = (100 * hdr->rssi) / 127;
 414         rx_status.rate_idx = hdr->rate & 0xf;
 415         rx_status.freq = freq;
 416         rx_status.band = IEEE80211_BAND_2GHZ;
 417         rx_status.antenna = hdr->antenna;
 418         rx_status.mactime = le64_to_cpu(hdr->timestamp);
 419         rx_status.flag |= RX_FLAG_TSFT;
 420
 421         skb_pull(skb, sizeof(*hdr));
 422         skb_trim(skb, le16_to_cpu(hdr->len));
 423
 424         ieee80211_rx_irqsafe(dev, skb, &rx_status);
 425 }
 426
 427 static void inline p54_wake_free_queues(struct ieee80211_hw *dev)
 428 {
 429         struct p54_common *priv = dev->priv;
 430         int i;
 431
 432         for (i = 0; i < dev->queues; i++)
 433                 if (priv->tx_stats[i + 4].len < priv->tx_stats[i + 4].limit)
 434                         ieee80211_wake_queue(dev, i);
 435 }
 436
 437 static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
 438 {
 439         struct p54_common *priv = dev->priv;
 440         struct p54_control_hdr *hdr = (struct p54_control_hdr *) skb->data;
 441         struct p54_frame_sent_hdr *payload = (struct p54_frame_sent_hdr *) hdr->data;
 442         struct sk_buff *entry = (struct sk_buff *) priv->tx_queue.next;
 443         u32 addr = le32_to_cpu(hdr->req_id) - priv->headroom;
 444         struct memrecord *range = NULL;
 445         u32 freed = 0;
 446         u32 last_addr = priv->rx_start;
 447         unsigned long flags;
 448
 449         spin_lock_irqsave(&priv->tx_queue.lock, flags);
 450         while (entry != (struct sk_buff *)&priv->tx_queue) {
 451                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(entry);
 452                 range = (void *)info->driver_data;
 453                 if (range->start_addr == addr) {
 454                         struct p54_control_hdr *entry_hdr;
 455                         struct p54_tx_control_allocdata *entry_data;
 456                         int pad = 0;
 457
 458                         if (entry->next != (struct sk_buff *)&priv->tx_queue) {
 459                                 struct ieee80211_tx_info *ni;
 460                                 struct memrecord *mr;
 461
 462                                 ni = IEEE80211_SKB_CB(entry->next);
 463                                 mr = (struct memrecord *)ni->driver_data;
 464                                 freed = mr->start_addr - last_addr;
 465                         } else
 466                                 freed = priv->rx_end - last_addr;
 467
 468                         last_addr = range->end_addr;
 469                         __skb_unlink(entry, &priv->tx_queue);
 470                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 471
 472                         memset(&info->status, 0, sizeof(info->status));
 473                         entry_hdr = (struct p54_control_hdr *) entry->data;
 474                         entry_data = (struct p54_tx_control_allocdata *) entry_hdr->data;
 475                         if ((entry_hdr->magic1 & cpu_to_le16(0x4000)) != 0)
 476                                 pad = entry_data->align[0];
 477
 478                         priv->tx_stats[entry_data->hw_queue].len--;
 479                         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 480                                 if (!(payload->status & 0x01))
 481                                         info->flags |= IEEE80211_TX_STAT_ACK;
 482                                 else
 483                                         info->status.excessive_retries = 1;
 484                         }
 485                         info->status.retry_count = payload->retries - 1;
 486                         info->status.ack_signal = le16_to_cpu(payload->ack_rssi);
 487                         skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
 488                         ieee80211_tx_status_irqsafe(dev, entry);
 489                         goto out;
 490                 } else
 491                         last_addr = range->end_addr;
 492                 entry = entry->next;
 493         }
 494         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 495
 496 out:
 497         if (freed >= IEEE80211_MAX_RTS_THRESHOLD + 0x170 +
 498             sizeof(struct p54_control_hdr))
 499                 p54_wake_free_queues(dev);
 500 }
 501
 502 static void p54_rx_control(struct ieee80211_hw *dev, struct sk_buff *skb)
 503 {
 504         struct p54_control_hdr *hdr = (struct p54_control_hdr *) skb->data;
 505
 506         switch (le16_to_cpu(hdr->type)) {
 507         case P54_CONTROL_TYPE_TXDONE:
 508                 p54_rx_frame_sent(dev, skb);
 509                 break;
 510         case P54_CONTROL_TYPE_BBP:
 511                 break;
 512         default:
 513                 printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
 514                        wiphy_name(dev->wiphy), le16_to_cpu(hdr->type));
 515                 break;
 516         }
 517 }
 518
 519 /* returns zero if skb can be reused */
 520 int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
 521 {
 522         u8 type = le16_to_cpu(*((__le16 *)skb->data)) >> 8;
 523         switch (type) {
 524         case 0x00:
 525         case 0x01:
 526                 p54_rx_data(dev, skb);
 527                 return -1;
 528         case 0x4d:
 529                 /* TODO: do something better... but then again, I've never seen this happen */
 530                 printk(KERN_ERR "%s: Received fault. Probably need to restart hardware now..\n",
 531                        wiphy_name(dev->wiphy));
 532                 break;
 533         case 0x80:
 534                 p54_rx_control(dev, skb);
 535                 break;
 536         default:
 537                 printk(KERN_ERR "%s: unknown frame RXed (0x%02x)\n",
 538                        wiphy_name(dev->wiphy), type);
 539                 break;
 540         }
 541         return 0;
 542 }
 543 EXPORT_SYMBOL_GPL(p54_rx);
 544
 545 /*
 546  * So, the firmware is somewhat stupid and doesn't know what places in its
 547  * memory incoming data should go to. By poking around in the firmware, we
 548  * can find some unused memory to upload our packets to. However, data that we
 549  * want the card to TX needs to stay intact until the card has told us that
 550  * it is done with it. This function finds empty places we can upload to and
 551  * marks allocated areas as reserved if necessary. p54_rx_frame_sent frees
 552  * allocated areas.
 553  */
 554 static void p54_assign_address(struct ieee80211_hw *dev, struct sk_buff *skb,
 555                                struct p54_control_hdr *data, u32 len)
 556 {
 557         struct p54_common *priv = dev->priv;
 558         struct sk_buff *entry = priv->tx_queue.next;
 559         struct sk_buff *target_skb = NULL;
 560         u32 last_addr = priv->rx_start;
 561         u32 largest_hole = 0;
 562         u32 target_addr = priv->rx_start;
 563         unsigned long flags;
 564         unsigned int left;
 565         len = (len + priv->headroom + priv->tailroom + 3) & ~0x3;
 566
 567         spin_lock_irqsave(&priv->tx_queue.lock, flags);
 568         left = skb_queue_len(&priv->tx_queue);
 569         while (left--) {
 570                 u32 hole_size;
 571                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(entry);
 572                 struct memrecord *range = (void *)info->driver_data;
 573                 hole_size = range->start_addr - last_addr;
 574                 if (!target_skb && hole_size >= len) {
 575                         target_skb = entry->prev;
 576                         hole_size -= len;
 577                         target_addr = last_addr;
 578                 }
 579                 largest_hole = max(largest_hole, hole_size);
 580                 last_addr = range->end_addr;
 581                 entry = entry->next;
 582         }
 583         if (!target_skb && priv->rx_end - last_addr >= len) {
 584                 target_skb = priv->tx_queue.prev;
 585                 largest_hole = max(largest_hole, priv->rx_end - last_addr - len);
 586                 if (!skb_queue_empty(&priv->tx_queue)) {
 587                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(target_skb);
 588                         struct memrecord *range = (void *)info->driver_data;
 589                         target_addr = range->end_addr;
 590                 }
 591         } else
 592                 largest_hole = max(largest_hole, priv->rx_end - last_addr);
 593
 594         if (skb) {
 595                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 596                 struct memrecord *range = (void *)info->driver_data;
 597                 range->start_addr = target_addr;
 598                 range->end_addr = target_addr + len;
 599                 __skb_queue_after(&priv->tx_queue, target_skb, skb);
 600                 if (largest_hole < priv->rx_mtu + priv->headroom +
 601                                    priv->tailroom +
 602                                    sizeof(struct p54_control_hdr))
 603                         ieee80211_stop_queues(dev);
 604         }
 605         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 606
 607         data->req_id = cpu_to_le32(target_addr + priv->headroom);
 608 }
 609
 610 static int p54_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 611 {
 612         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 613         struct ieee80211_tx_queue_stats *current_queue;
 614         struct p54_common *priv = dev->priv;
 615         struct p54_control_hdr *hdr;
 616         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 617         struct p54_tx_control_allocdata *txhdr;
 618         size_t padding, len;
 619         u8 rate;
 620         u8 cts_rate = 0x20;
 621
 622         current_queue = &priv->tx_stats[skb_get_queue_mapping(skb) + 4];
 623         if (unlikely(current_queue->len > current_queue->limit))
 624                 return NETDEV_TX_BUSY;
 625         current_queue->len++;
 626         current_queue->count++;
 627         if (current_queue->len == current_queue->limit)
 628                 ieee80211_stop_queue(dev, skb_get_queue_mapping(skb));
 629
 630         padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
 631         len = skb->len;
 632
 633         txhdr = (struct p54_tx_control_allocdata *)
 634                         skb_push(skb, sizeof(*txhdr) + padding);
 635         hdr = (struct p54_control_hdr *) skb_push(skb, sizeof(*hdr));
 636
 637         if (padding)
 638                 hdr->magic1 = cpu_to_le16(0x4010);
 639         else
 640                 hdr->magic1 = cpu_to_le16(0x0010);
 641         hdr->len = cpu_to_le16(len);
 642         hdr->type = (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 0 : cpu_to_le16(1);
 643         hdr->retry1 = hdr->retry2 = info->control.retry_limit;
 644
 645         /* TODO: add support for alternate retry TX rates */
 646         rate = ieee80211_get_tx_rate(dev, info)->hw_value;
 647         if (info->flags & IEEE80211_TX_CTL_SHORT_PREAMBLE) {
 648                 rate |= 0x10;
 649                 cts_rate |= 0x10;
 650         }
 651         if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) {
 652                 rate |= 0x40;
 653                 cts_rate |= ieee80211_get_rts_cts_rate(dev, info)->hw_value;
 654         } else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) {
 655                 rate |= 0x20;
 656                 cts_rate |= ieee80211_get_rts_cts_rate(dev, info)->hw_value;
 657         }
 658         memset(txhdr->rateset, rate, 8);
 659         txhdr->key_type = 0;
 660         txhdr->key_len = 0;
 661         txhdr->hw_queue = skb_get_queue_mapping(skb) + 4;
 662         txhdr->tx_antenna = (info->antenna_sel_tx == 0) ?
 663                 2 : info->antenna_sel_tx - 1;
 664         txhdr->output_power = 0x7f; // HW Maximum
 665         txhdr->cts_rate = (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
 666                           0 : cts_rate;
 667         if (padding)
 668                 txhdr->align[0] = padding;
 669
 670         /* FIXME: The sequence that follows is needed for this driver to
 671          * work with mac80211 since "mac80211: fix TX sequence numbers".
 672          * As with the temporary code in rt2x00, changes will be needed
 673          * to get proper sequence numbers on beacons. In addition, this
 674          * patch places the sequence number in the hardware state, which
 675          * limits us to a single virtual state.
 676          */
 677         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 678                 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 679                         priv->seqno += 0x10;
 680                 ieee80211hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 681                 ieee80211hdr->seq_ctrl |= cpu_to_le16(priv->seqno);
 682         }
 683         /* modifies skb->cb and with it info, so must be last! */
 684         p54_assign_address(dev, skb, hdr, skb->len);
 685
 686         priv->tx(dev, hdr, skb->len, 0);
 687         return 0;
 688 }
 689
 690 static int p54_set_filter(struct ieee80211_hw *dev, u16 filter_type,
 691                           const u8 *dst, const u8 *src, u8 antenna,
 692                           u32 magic3, u32 magic8, u32 magic9)
 693 {
 694         struct p54_common *priv = dev->priv;
 695         struct p54_control_hdr *hdr;
 696         struct p54_tx_control_filter *filter;
 697
 698         hdr = kzalloc(sizeof(*hdr) + sizeof(*filter) +
 699                       priv->tx_hdr_len, GFP_ATOMIC);
 700         if (!hdr)
 701                 return -ENOMEM;
 702
 703         hdr = (void *)hdr + priv->tx_hdr_len;
 704
 705         filter = (struct p54_tx_control_filter *) hdr->data;
 706         hdr->magic1 = cpu_to_le16(0x8001);
 707         hdr->len = cpu_to_le16(sizeof(*filter));
 708         p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*filter));
 709         hdr->type = cpu_to_le16(P54_CONTROL_TYPE_FILTER_SET);
 710
 711         filter->filter_type = cpu_to_le16(filter_type);
 712         memcpy(filter->dst, dst, ETH_ALEN);
 713         if (!src)
 714                 memset(filter->src, ~0, ETH_ALEN);
 715         else
 716                 memcpy(filter->src, src, ETH_ALEN);
 717         filter->antenna = antenna;
 718         filter->magic3 = cpu_to_le32(magic3);
 719         filter->rx_addr = cpu_to_le32(priv->rx_end);
 720         filter->max_rx = cpu_to_le16(priv->rx_mtu);
 721         filter->rxhw = priv->rxhw;
 722         filter->magic8 = cpu_to_le16(magic8);
 723         filter->magic9 = cpu_to_le16(magic9);
 724
 725         priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*filter), 1);
 726         return 0;
 727 }
 728
 729 static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
 730 {
 731         struct p54_common *priv = dev->priv;
 732         struct p54_control_hdr *hdr;
 733         struct p54_tx_control_channel *chan;
 734         unsigned int i;
 735         void *entry;
 736
 737         hdr = kzalloc(sizeof(*hdr) + sizeof(*chan) +
 738                       priv->tx_hdr_len, GFP_KERNEL);
 739         if (!hdr)
 740                 return -ENOMEM;
 741
 742         hdr = (void *)hdr + priv->tx_hdr_len;
 743
 744         chan = (struct p54_tx_control_channel *) hdr->data;
 745
 746         hdr->magic1 = cpu_to_le16(0x8001);
 747         hdr->len = cpu_to_le16(sizeof(*chan));
 748         hdr->type = cpu_to_le16(P54_CONTROL_TYPE_CHANNEL_CHANGE);
 749         p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*chan));
 750
 751         chan->flags = cpu_to_le16(0x1);
 752         chan->dwell = cpu_to_le16(0x0);
 753
 754         for (i = 0; i < priv->iq_autocal_len; i++) {
 755                 if (priv->iq_autocal[i].freq != freq)
 756                         continue;
 757
 758                 memcpy(&chan->iq_autocal, &priv->iq_autocal[i],
 759                        sizeof(*priv->iq_autocal));
 760                 break;
 761         }
 762         if (i == priv->iq_autocal_len)
 763                 goto err;
 764
 765         for (i = 0; i < priv->output_limit_len; i++) {
 766                 if (priv->output_limit[i].freq != freq)
 767                         continue;
 768
 769                 chan->val_barker = 0x38;
 770                 chan->val_bpsk = chan->dup_bpsk =
 771                         priv->output_limit[i].val_bpsk;
 772                 chan->val_qpsk = chan->dup_qpsk =
 773                         priv->output_limit[i].val_qpsk;
 774                 chan->val_16qam = chan->dup_16qam =
 775                         priv->output_limit[i].val_16qam;
 776                 chan->val_64qam = chan->dup_64qam =
 777                         priv->output_limit[i].val_64qam;
 778                 break;
 779         }
 780         if (i == priv->output_limit_len)
 781                 goto err;
 782
 783         entry = priv->curve_data->data;
 784         for (i = 0; i < priv->curve_data->channels; i++) {
 785                 if (*((__le16 *)entry) != freq) {
 786                         entry += sizeof(__le16);
 787                         entry += sizeof(struct p54_pa_curve_data_sample) *
 788                                  priv->curve_data->points_per_channel;
 789                         continue;
 790                 }
 791
 792                 entry += sizeof(__le16);
 793                 chan->pa_points_per_curve =
 794                         min(priv->curve_data->points_per_channel, (u8) 8);
 795
 796                 memcpy(chan->curve_data, entry, sizeof(*chan->curve_data) *
 797                        chan->pa_points_per_curve);
 798                 break;
 799         }
 800
 801         chan->rssical_mul = cpu_to_le16(130);
 802         chan->rssical_add = cpu_to_le16(0xfe70);        /* -400 */
 803
 804         priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*chan), 1);
 805         return 0;
 806
 807  err:
 808         printk(KERN_ERR "%s: frequency change failed\n", wiphy_name(dev->wiphy));
 809         kfree(hdr);
 810         return -EINVAL;
 811 }
 812
 813 static int p54_set_leds(struct ieee80211_hw *dev, int mode, int link, int act)
 814 {
 815         struct p54_common *priv = dev->priv;
 816         struct p54_control_hdr *hdr;
 817         struct p54_tx_control_led *led;
 818
 819         hdr = kzalloc(sizeof(*hdr) + sizeof(*led) +
 820                       priv->tx_hdr_len, GFP_KERNEL);
 821         if (!hdr)
 822                 return -ENOMEM;
 823
 824         hdr = (void *)hdr + priv->tx_hdr_len;
 825         hdr->magic1 = cpu_to_le16(0x8001);
 826         hdr->len = cpu_to_le16(sizeof(*led));
 827         hdr->type = cpu_to_le16(P54_CONTROL_TYPE_LED);
 828         p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*led));
 829
 830         led = (struct p54_tx_control_led *) hdr->data;
 831         led->mode = cpu_to_le16(mode);
 832         led->led_permanent = cpu_to_le16(link);
 833         led->led_temporary = cpu_to_le16(act);
 834         led->duration = cpu_to_le16(1000);
 835
 836         priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*led), 1);
 837
 838         return 0;
 839 }
 840
 841 #define P54_SET_QUEUE(queue, ai_fs, cw_min, cw_max, _txop)      \
 842 do {                                                            \
 843         queue.aifs = cpu_to_le16(ai_fs);                        \
 844         queue.cwmin = cpu_to_le16(cw_min);                      \
 845         queue.cwmax = cpu_to_le16(cw_max);                      \
 846         queue.txop = cpu_to_le16(_txop);                        \
 847 } while(0)
 848
 849 static void p54_init_vdcf(struct ieee80211_hw *dev)
 850 {
 851         struct p54_common *priv = dev->priv;
 852         struct p54_control_hdr *hdr;
 853         struct p54_tx_control_vdcf *vdcf;
 854
 855         /* all USB V1 adapters need a extra headroom */
 856         hdr = (void *)priv->cached_vdcf + priv->tx_hdr_len;
 857         hdr->magic1 = cpu_to_le16(0x8001);
 858         hdr->len = cpu_to_le16(sizeof(*vdcf));
 859         hdr->type = cpu_to_le16(P54_CONTROL_TYPE_DCFINIT);
 860         hdr->req_id = cpu_to_le32(priv->rx_start);
 861
 862         vdcf = (struct p54_tx_control_vdcf *) hdr->data;
 863
 864         P54_SET_QUEUE(vdcf->queue[0], 0x0002, 0x0003, 0x0007, 47);
 865         P54_SET_QUEUE(vdcf->queue[1], 0x0002, 0x0007, 0x000f, 94);
 866         P54_SET_QUEUE(vdcf->queue[2], 0x0003, 0x000f, 0x03ff, 0);
 867         P54_SET_QUEUE(vdcf->queue[3], 0x0007, 0x000f, 0x03ff, 0);
 868 }
 869
 870 static void p54_set_vdcf(struct ieee80211_hw *dev)
 871 {
 872         struct p54_common *priv = dev->priv;
 873         struct p54_control_hdr *hdr;
 874         struct p54_tx_control_vdcf *vdcf;
 875
 876         hdr = (void *)priv->cached_vdcf + priv->tx_hdr_len;
 877
 878         p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*vdcf));
 879
 880         vdcf = (struct p54_tx_control_vdcf *) hdr->data;
 881
 882         if (dev->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) {
 883                 vdcf->slottime = 9;
 884                 vdcf->magic1 = 0x10;
 885                 vdcf->magic2 = 0x00;
 886         } else {
 887                 vdcf->slottime = 20;
 888                 vdcf->magic1 = 0x0a;
 889                 vdcf->magic2 = 0x06;
 890         }
 891
 892         /* (see prism54/isl_oid.h for further details) */
 893         vdcf->frameburst = cpu_to_le16(0);
 894
 895         priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*vdcf), 0);
 896 }
 897
 898 static int p54_start(struct ieee80211_hw *dev)
 899 {
 900         struct p54_common *priv = dev->priv;
 901         int err;
 902
 903         if (!priv->cached_vdcf) {
 904                 priv->cached_vdcf = kzalloc(sizeof(struct p54_tx_control_vdcf)+
 905                         priv->tx_hdr_len + sizeof(struct p54_control_hdr),
 906                         GFP_KERNEL);
 907
 908                 if (!priv->cached_vdcf)
 909                         return -ENOMEM;
 910         }
 911
 912         err = priv->open(dev);
 913         if (!err)
 914                 priv->mode = IEEE80211_IF_TYPE_MNTR;
 915
 916         p54_init_vdcf(dev);
 917
 918         return err;
 919 }
 920
 921 static void p54_stop(struct ieee80211_hw *dev)
 922 {
 923         struct p54_common *priv = dev->priv;
 924         struct sk_buff *skb;
 925         while ((skb = skb_dequeue(&priv->tx_queue)))
 926                 kfree_skb(skb);
 927         priv->stop(dev);
 928         priv->mode = IEEE80211_IF_TYPE_INVALID;
 929 }
 930
 931 static int p54_add_interface(struct ieee80211_hw *dev,
 932                              struct ieee80211_if_init_conf *conf)
 933 {
 934         struct p54_common *priv = dev->priv;
 935
 936         if (priv->mode != IEEE80211_IF_TYPE_MNTR)
 937                 return -EOPNOTSUPP;
 938
 939         switch (conf->type) {
 940         case IEEE80211_IF_TYPE_STA:
 941                 priv->mode = conf->type;
 942                 break;
 943         default:
 944                 return -EOPNOTSUPP;
 945         }
 946
 947         memcpy(priv->mac_addr, conf->mac_addr, ETH_ALEN);
 948
 949         p54_set_filter(dev, 0, priv->mac_addr, NULL, 0, 1, 0, 0xF642);
 950         p54_set_filter(dev, 0, priv->mac_addr, NULL, 1, 0, 0, 0xF642);
 951
 952         switch (conf->type) {
 953         case IEEE80211_IF_TYPE_STA:
 954                 p54_set_filter(dev, 1, priv->mac_addr, NULL, 0, 0x15F, 0x1F4, 0);
 955                 break;
 956         default:
 957                 BUG();  /* impossible */
 958                 break;
 959         }
 960
 961         p54_set_leds(dev, 1, 0, 0);
 962
 963         return 0;
 964 }
 965
 966 static void p54_remove_interface(struct ieee80211_hw *dev,
 967                                  struct ieee80211_if_init_conf *conf)
 968 {
 969         struct p54_common *priv = dev->priv;
 970         priv->mode = IEEE80211_IF_TYPE_MNTR;
 971         memset(priv->mac_addr, 0, ETH_ALEN);
 972         p54_set_filter(dev, 0, priv->mac_addr, NULL, 2, 0, 0, 0);
 973 }
 974
 975 static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
 976 {
 977         int ret;
 978         struct p54_common *priv = dev->priv;
 979
 980         mutex_lock(&priv->conf_mutex);
 981         ret = p54_set_freq(dev, cpu_to_le16(conf->channel->center_freq));
 982         p54_set_vdcf(dev);
 983         mutex_unlock(&priv->conf_mutex);
 984         return ret;
 985 }
 986
 987 static int p54_config_interface(struct ieee80211_hw *dev,
 988                                 struct ieee80211_vif *vif,
 989                                 struct ieee80211_if_conf *conf)
 990 {
 991         struct p54_common *priv = dev->priv;
 992
 993         mutex_lock(&priv->conf_mutex);
 994         p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 0, 1, 0, 0xF642);
 995         p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 2, 0, 0, 0);
 996         p54_set_leds(dev, 1, !is_multicast_ether_addr(conf->bssid), 0);
 997         memcpy(priv->bssid, conf->bssid, ETH_ALEN);
 998         mutex_unlock(&priv->conf_mutex);
 999         return 0;
1000 }
1001
1002 static void p54_configure_filter(struct ieee80211_hw *dev,
1003                                  unsigned int changed_flags,
1004                                  unsigned int *total_flags,
1005                                  int mc_count, struct dev_mc_list *mclist)
1006 {
1007         struct p54_common *priv = dev->priv;
1008
1009         *total_flags &= FIF_BCN_PRBRESP_PROMISC;
1010
1011         if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
1012                 if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
1013                         p54_set_filter(dev, 0, priv->mac_addr,
1014                                        NULL, 2, 0, 0, 0);
1015                 else
1016                         p54_set_filter(dev, 0, priv->mac_addr,
1017                                        priv->bssid, 2, 0, 0, 0);
1018         }
1019 }
1020
1021 static int p54_conf_tx(struct ieee80211_hw *dev, u16 queue,
1022                        const struct ieee80211_tx_queue_params *params)
1023 {
1024         struct p54_common *priv = dev->priv;
1025         struct p54_tx_control_vdcf *vdcf;
1026
1027         vdcf = (struct p54_tx_control_vdcf *)(((struct p54_control_hdr *)
1028                 ((void *)priv->cached_vdcf + priv->tx_hdr_len))->data);
1029
1030         if ((params) && !(queue > 4)) {
1031                 P54_SET_QUEUE(vdcf->queue[queue], params->aifs,
1032                         params->cw_min, params->cw_max, params->txop);
1033         } else
1034                 return -EINVAL;
1035
1036         p54_set_vdcf(dev);
1037
1038         return 0;
1039 }
1040
1041 static int p54_get_stats(struct ieee80211_hw *dev,
1042                          struct ieee80211_low_level_stats *stats)
1043 {
1044         /* TODO */
1045         return 0;
1046 }
1047
1048 static int p54_get_tx_stats(struct ieee80211_hw *dev,
1049                             struct ieee80211_tx_queue_stats *stats)
1050 {
1051         struct p54_common *priv = dev->priv;
1052
1053         memcpy(stats, &priv->tx_stats[4], sizeof(stats[0]) * dev->queues);
1054
1055         return 0;
1056 }
1057
1058 static const struct ieee80211_ops p54_ops = {
1059         .tx                     = p54_tx,
1060         .start                  = p54_start,
1061         .stop                   = p54_stop,
1062         .add_interface          = p54_add_interface,
1063         .remove_interface       = p54_remove_interface,
1064         .config                 = p54_config,
1065         .config_interface       = p54_config_interface,
1066         .configure_filter       = p54_configure_filter,
1067         .conf_tx                = p54_conf_tx,
1068         .get_stats              = p54_get_stats,
1069         .get_tx_stats           = p54_get_tx_stats
1070 };
1071
1072 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
1073 {
1074         struct ieee80211_hw *dev;
1075         struct p54_common *priv;
1076
1077         dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
1078         if (!dev)
1079                 return NULL;
1080
1081         priv = dev->priv;
1082         priv->mode = IEEE80211_IF_TYPE_INVALID;
1083         skb_queue_head_init(&priv->tx_queue);
1084         dev->wiphy->bands[IEEE80211_BAND_2GHZ] = &band_2GHz;
1085         dev->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING | /* not sure */
1086                      IEEE80211_HW_RX_INCLUDES_FCS |
1087                      IEEE80211_HW_SIGNAL_UNSPEC;
1088
1089         dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1090
1091         dev->channel_change_time = 1000;        /* TODO: find actual value */
1092         dev->max_signal = 127;
1093
1094         priv->tx_stats[0].limit = 1;
1095         priv->tx_stats[1].limit = 1;
1096         priv->tx_stats[2].limit = 1;
1097         priv->tx_stats[3].limit = 1;
1098         priv->tx_stats[4].limit = 5;
1099         dev->queues = 1;
1100         dev->extra_tx_headroom = sizeof(struct p54_control_hdr) + 4 +
1101                                  sizeof(struct p54_tx_control_allocdata);
1102
1103         mutex_init(&priv->conf_mutex);
1104
1105         return dev;
1106 }
1107 EXPORT_SYMBOL_GPL(p54_init_common);
1108
1109 void p54_free_common(struct ieee80211_hw *dev)
1110 {
1111         struct p54_common *priv = dev->priv;
1112         kfree(priv->iq_autocal);
1113         kfree(priv->output_limit);
1114         kfree(priv->curve_data);
1115         kfree(priv->cached_vdcf);
1116 }
1117 EXPORT_SYMBOL_GPL(p54_free_common);
1118
1119 static int __init p54_init(void)
1120 {
1121         return 0;
1122 }
1123
1124 static void __exit p54_exit(void)
1125 {
1126 }
1127
1128 module_init(p54_init);
1129 module_exit(p54_exit);