git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/rt2x00/rt2x00usb.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00usb
  23         Abstract: rt2x00 generic usb device routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/usb.h>
  29 #include <linux/bug.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00usb.h"
  33
  34 /*
  35  * Interfacing with the HW.
  36  */
  37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
  38                              const u8 request, const u8 requesttype,
  39                              const u16 offset, const u16 value,
  40                              void *buffer, const u16 buffer_length,
  41                              const int timeout)
  42 {
  43         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
  44         int status;
  45         unsigned int i;
  46         unsigned int pipe =
  47             (requesttype == USB_VENDOR_REQUEST_IN) ?
  48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  49
  50
  51         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  52                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  53                                          value, offset, buffer, buffer_length,
  54                                          timeout);
  55                 if (status >= 0)
  56                         return 0;
  57
  58                 /*
  59                  * Check for errors
  60                  * -ENODEV: Device has disappeared, no point continuing.
  61                  * All other errors: Try again.
  62                  */
  63                 else if (status == -ENODEV)
  64                         break;
  65         }
  66
  67         ERROR(rt2x00dev,
  68               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  69               request, offset, status);
  70
  71         return status;
  72 }
  73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  74
  75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
  76                                    const u8 request, const u8 requesttype,
  77                                    const u16 offset, void *buffer,
  78                                    const u16 buffer_length, const int timeout)
  79 {
  80         int status;
  81
  82         BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
  83
  84         /*
  85          * Check for Cache availability.
  86          */
  87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
  88                 ERROR(rt2x00dev, "CSR cache not available.\n");
  89                 return -ENOMEM;
  90         }
  91
  92         if (requesttype == USB_VENDOR_REQUEST_OUT)
  93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
  94
  95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
  96                                           offset, 0, rt2x00dev->csr.cache,
  97                                           buffer_length, timeout);
  98
  99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
 101
 102         return status;
 103 }
 104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
 105
 106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 107                                   const u8 request, const u8 requesttype,
 108                                   const u16 offset, void *buffer,
 109                                   const u16 buffer_length, const int timeout)
 110 {
 111         int status;
 112
 113         mutex_lock(&rt2x00dev->usb_cache_mutex);
 114
 115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 116                                                 requesttype, offset, buffer,
 117                                                 buffer_length, timeout);
 118
 119         mutex_unlock(&rt2x00dev->usb_cache_mutex);
 120
 121         return status;
 122 }
 123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 124
 125 int rt2x00usb_vendor_request_large_buff(struct rt2x00_dev *rt2x00dev,
 126                                         const u8 request, const u8 requesttype,
 127                                         const u16 offset, void *buffer,
 128                                         const u16 buffer_length,
 129                                         const int timeout)
 130 {
 131         int status = 0;
 132         unsigned char *tb;
 133         u16 off, len, bsize;
 134
 135         mutex_lock(&rt2x00dev->usb_cache_mutex);
 136
 137         tb  = buffer;
 138         off = offset;
 139         len = buffer_length;
 140         while (len && !status) {
 141                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
 142                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
 143                                                         requesttype, off, tb,
 144                                                         bsize, timeout);
 145
 146                 tb  += bsize;
 147                 len -= bsize;
 148                 off += bsize;
 149         }
 150
 151         mutex_unlock(&rt2x00dev->usb_cache_mutex);
 152
 153         return status;
 154 }
 155 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_large_buff);
 156
 157 /*
 158  * TX data handlers.
 159  */
 160 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 161 {
 162         struct queue_entry *entry = (struct queue_entry *)urb->context;
 163         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 164         struct txdone_entry_desc txdesc;
 165
 166         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 167             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 168                 return;
 169
 170         /*
 171          * Remove the descriptor data from the buffer.
 172          */
 173         skb_pull(entry->skb, entry->queue->desc_size);
 174
 175         /*
 176          * Obtain the status about this packet.
 177          * Note that when the status is 0 it does not mean the
 178          * frame was send out correctly. It only means the frame
 179          * was succesfully pushed to the hardware, we have no
 180          * way to determine the transmission status right now.
 181          * (Only indirectly by looking at the failed TX counters
 182          * in the register).
 183          */
 184         if (!urb->status)
 185                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
 186         else
 187                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
 188         txdesc.retry = 0;
 189
 190         rt2x00lib_txdone(entry, &txdesc);
 191 }
 192
 193 int rt2x00usb_write_tx_data(struct queue_entry *entry)
 194 {
 195         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 196         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 197         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 198         struct skb_frame_desc *skbdesc;
 199         u32 length;
 200
 201         /*
 202          * Add the descriptor in front of the skb.
 203          */
 204         skb_push(entry->skb, entry->queue->desc_size);
 205         memset(entry->skb->data, 0, entry->queue->desc_size);
 206
 207         /*
 208          * Fill in skb descriptor
 209          */
 210         skbdesc = get_skb_frame_desc(entry->skb);
 211         skbdesc->desc = entry->skb->data;
 212         skbdesc->desc_len = entry->queue->desc_size;
 213
 214         /*
 215          * USB devices cannot blindly pass the skb->len as the
 216          * length of the data to usb_fill_bulk_urb. Pass the skb
 217          * to the driver to determine what the length should be.
 218          */
 219         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb);
 220
 221         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 222                           usb_sndbulkpipe(usb_dev, 1),
 223                           entry->skb->data, length,
 224                           rt2x00usb_interrupt_txdone, entry);
 225
 226         return 0;
 227 }
 228 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 229
 230 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
 231 {
 232         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 233
 234         if (__test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
 235                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 236 }
 237
 238 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 239                              const enum data_queue_qid qid)
 240 {
 241         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
 242         unsigned long irqflags;
 243         unsigned int index;
 244         unsigned int index_done;
 245         unsigned int i;
 246
 247         /*
 248          * Only protect the range we are going to loop over,
 249          * if during our loop a extra entry is set to pending
 250          * it should not be kicked during this run, since it
 251          * is part of another TX operation.
 252          */
 253         spin_lock_irqsave(&queue->lock, irqflags);
 254         index = queue->index[Q_INDEX];
 255         index_done = queue->index[Q_INDEX_DONE];
 256         spin_unlock_irqrestore(&queue->lock, irqflags);
 257
 258         /*
 259          * Start from the TX done pointer, this guarentees that we will
 260          * send out all frames in the correct order.
 261          */
 262         if (index_done < index) {
 263                 for (i = index_done; i < index; i++)
 264                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 265         } else {
 266                 for (i = index_done; i < queue->limit; i++)
 267                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 268
 269                 for (i = 0; i < index; i++)
 270                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
 271         }
 272 }
 273 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
 274
 275 /*
 276  * RX data handlers.
 277  */
 278 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 279 {
 280         struct queue_entry *entry = (struct queue_entry *)urb->context;
 281         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 282         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 283         u8 rxd[32];
 284
 285         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 286             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
 287                 return;
 288
 289         /*
 290          * Check if the received data is simply too small
 291          * to be actually valid, or if the urb is signaling
 292          * a problem.
 293          */
 294         if (urb->actual_length < entry->queue->desc_size || urb->status) {
 295                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 296                 usb_submit_urb(urb, GFP_ATOMIC);
 297                 return;
 298         }
 299
 300         /*
 301          * Fill in desc fields of the skb descriptor
 302          */
 303         skbdesc->desc = rxd;
 304         skbdesc->desc_len = entry->queue->desc_size;
 305
 306         /*
 307          * Send the frame to rt2x00lib for further processing.
 308          */
 309         rt2x00lib_rxdone(rt2x00dev, entry);
 310 }
 311
 312 /*
 313  * Radio handlers
 314  */
 315 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 316 {
 317         struct queue_entry_priv_usb *entry_priv;
 318         struct queue_entry_priv_usb_bcn *bcn_priv;
 319         struct data_queue *queue;
 320         unsigned int i;
 321
 322         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
 323                                     REGISTER_TIMEOUT);
 324
 325         /*
 326          * Cancel all queues.
 327          */
 328         queue_for_each(rt2x00dev, queue) {
 329                 for (i = 0; i < queue->limit; i++) {
 330                         entry_priv = queue->entries[i].priv_data;
 331                         usb_kill_urb(entry_priv->urb);
 332                 }
 333         }
 334
 335         /*
 336          * Kill guardian urb (if required by driver).
 337          */
 338         if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 339                 return;
 340
 341         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
 342                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
 343                 if (bcn_priv->guardian_urb)
 344                         usb_kill_urb(bcn_priv->guardian_urb);
 345         }
 346 }
 347 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 348
 349 /*
 350  * Device initialization handlers.
 351  */
 352 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
 353                             struct queue_entry *entry)
 354 {
 355         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
 356         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 357
 358         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
 359                           usb_rcvbulkpipe(usb_dev, 1),
 360                           entry->skb->data, entry->skb->len,
 361                           rt2x00usb_interrupt_rxdone, entry);
 362
 363         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 364         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 365 }
 366 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
 367
 368 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
 369                             struct queue_entry *entry)
 370 {
 371         entry->flags = 0;
 372 }
 373 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
 374
 375 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 376                                struct data_queue *queue)
 377 {
 378         struct queue_entry_priv_usb *entry_priv;
 379         struct queue_entry_priv_usb_bcn *bcn_priv;
 380         unsigned int i;
 381
 382         for (i = 0; i < queue->limit; i++) {
 383                 entry_priv = queue->entries[i].priv_data;
 384                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
 385                 if (!entry_priv->urb)
 386                         return -ENOMEM;
 387         }
 388
 389         /*
 390          * If this is not the beacon queue or
 391          * no guardian byte was required for the beacon,
 392          * then we are done.
 393          */
 394         if (rt2x00dev->bcn != queue ||
 395             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 396                 return 0;
 397
 398         for (i = 0; i < queue->limit; i++) {
 399                 bcn_priv = queue->entries[i].priv_data;
 400                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
 401                 if (!bcn_priv->guardian_urb)
 402                         return -ENOMEM;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 409                                struct data_queue *queue)
 410 {
 411         struct queue_entry_priv_usb *entry_priv;
 412         struct queue_entry_priv_usb_bcn *bcn_priv;
 413         unsigned int i;
 414
 415         if (!queue->entries)
 416                 return;
 417
 418         for (i = 0; i < queue->limit; i++) {
 419                 entry_priv = queue->entries[i].priv_data;
 420                 usb_kill_urb(entry_priv->urb);
 421                 usb_free_urb(entry_priv->urb);
 422         }
 423
 424         /*
 425          * If this is not the beacon queue or
 426          * no guardian byte was required for the beacon,
 427          * then we are done.
 428          */
 429         if (rt2x00dev->bcn != queue ||
 430             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
 431                 return;
 432
 433         for (i = 0; i < queue->limit; i++) {
 434                 bcn_priv = queue->entries[i].priv_data;
 435                 usb_kill_urb(bcn_priv->guardian_urb);
 436                 usb_free_urb(bcn_priv->guardian_urb);
 437         }
 438 }
 439
 440 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 441 {
 442         struct data_queue *queue;
 443         int status;
 444
 445         /*
 446          * Allocate DMA
 447          */
 448         queue_for_each(rt2x00dev, queue) {
 449                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
 450                 if (status)
 451                         goto exit;
 452         }
 453
 454         return 0;
 455
 456 exit:
 457         rt2x00usb_uninitialize(rt2x00dev);
 458
 459         return status;
 460 }
 461 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 462
 463 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 464 {
 465         struct data_queue *queue;
 466
 467         queue_for_each(rt2x00dev, queue)
 468                 rt2x00usb_free_urb(rt2x00dev, queue);
 469 }
 470 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 471
 472 /*
 473  * USB driver handlers.
 474  */
 475 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 476 {
 477         kfree(rt2x00dev->rf);
 478         rt2x00dev->rf = NULL;
 479
 480         kfree(rt2x00dev->eeprom);
 481         rt2x00dev->eeprom = NULL;
 482
 483         kfree(rt2x00dev->csr.cache);
 484         rt2x00dev->csr.cache = NULL;
 485 }
 486
 487 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 488 {
 489         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 490         if (!rt2x00dev->csr.cache)
 491                 goto exit;
 492
 493         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 494         if (!rt2x00dev->eeprom)
 495                 goto exit;
 496
 497         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 498         if (!rt2x00dev->rf)
 499                 goto exit;
 500
 501         return 0;
 502
 503 exit:
 504         ERROR_PROBE("Failed to allocate registers.\n");
 505
 506         rt2x00usb_free_reg(rt2x00dev);
 507
 508         return -ENOMEM;
 509 }
 510
 511 int rt2x00usb_probe(struct usb_interface *usb_intf,
 512                     const struct usb_device_id *id)
 513 {
 514         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 515         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 516         struct ieee80211_hw *hw;
 517         struct rt2x00_dev *rt2x00dev;
 518         int retval;
 519
 520         usb_dev = usb_get_dev(usb_dev);
 521
 522         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 523         if (!hw) {
 524                 ERROR_PROBE("Failed to allocate hardware.\n");
 525                 retval = -ENOMEM;
 526                 goto exit_put_device;
 527         }
 528
 529         usb_set_intfdata(usb_intf, hw);
 530
 531         rt2x00dev = hw->priv;
 532         rt2x00dev->dev = &usb_intf->dev;
 533         rt2x00dev->ops = ops;
 534         rt2x00dev->hw = hw;
 535         mutex_init(&rt2x00dev->usb_cache_mutex);
 536
 537         rt2x00dev->usb_maxpacket =
 538             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
 539         if (!rt2x00dev->usb_maxpacket)
 540                 rt2x00dev->usb_maxpacket = 1;
 541
 542         retval = rt2x00usb_alloc_reg(rt2x00dev);
 543         if (retval)
 544                 goto exit_free_device;
 545
 546         retval = rt2x00lib_probe_dev(rt2x00dev);
 547         if (retval)
 548                 goto exit_free_reg;
 549
 550         return 0;
 551
 552 exit_free_reg:
 553         rt2x00usb_free_reg(rt2x00dev);
 554
 555 exit_free_device:
 556         ieee80211_free_hw(hw);
 557
 558 exit_put_device:
 559         usb_put_dev(usb_dev);
 560
 561         usb_set_intfdata(usb_intf, NULL);
 562
 563         return retval;
 564 }
 565 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 566
 567 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 568 {
 569         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 570         struct rt2x00_dev *rt2x00dev = hw->priv;
 571
 572         /*
 573          * Free all allocated data.
 574          */
 575         rt2x00lib_remove_dev(rt2x00dev);
 576         rt2x00usb_free_reg(rt2x00dev);
 577         ieee80211_free_hw(hw);
 578
 579         /*
 580          * Free the USB device data.
 581          */
 582         usb_set_intfdata(usb_intf, NULL);
 583         usb_put_dev(interface_to_usbdev(usb_intf));
 584 }
 585 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 586
 587 #ifdef CONFIG_PM
 588 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 589 {
 590         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 591         struct rt2x00_dev *rt2x00dev = hw->priv;
 592         int retval;
 593
 594         retval = rt2x00lib_suspend(rt2x00dev, state);
 595         if (retval)
 596                 return retval;
 597
 598         rt2x00usb_free_reg(rt2x00dev);
 599
 600         /*
 601          * Decrease usbdev refcount.
 602          */
 603         usb_put_dev(interface_to_usbdev(usb_intf));
 604
 605         return 0;
 606 }
 607 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 608
 609 int rt2x00usb_resume(struct usb_interface *usb_intf)
 610 {
 611         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 612         struct rt2x00_dev *rt2x00dev = hw->priv;
 613         int retval;
 614
 615         usb_get_dev(interface_to_usbdev(usb_intf));
 616
 617         retval = rt2x00usb_alloc_reg(rt2x00dev);
 618         if (retval)
 619                 return retval;
 620
 621         retval = rt2x00lib_resume(rt2x00dev);
 622         if (retval)
 623                 goto exit_free_reg;
 624
 625         return 0;
 626
 627 exit_free_reg:
 628         rt2x00usb_free_reg(rt2x00dev);
 629
 630         return retval;
 631 }
 632 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 633 #endif /* CONFIG_PM */
 634
 635 /*
 636  * rt2x00usb module information.
 637  */
 638 MODULE_AUTHOR(DRV_PROJECT);
 639 MODULE_VERSION(DRV_VERSION);
 640 MODULE_DESCRIPTION("rt2x00 usb library");
 641 MODULE_LICENSE("GPL");