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   1 /*
   2         Copyright (C) 2004 - 2007 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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00usb"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/usb.h>
  34
  35 #include "rt2x00.h"
  36 #include "rt2x00usb.h"
  37
  38 /*
  39  * Interfacing with the HW.
  40  */
  41 int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev,
  42                              const u8 request, const u8 requesttype,
  43                              const u16 offset, const u16 value,
  44                              void *buffer, const u16 buffer_length,
  45                              u16 timeout)
  46 {
  47         struct usb_device *usb_dev =
  48             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
  49         int status;
  50         unsigned int i;
  51         unsigned int pipe =
  52             (requesttype == USB_VENDOR_REQUEST_IN) ?
  53             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
  54
  55         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  56                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
  57                                          value, offset, buffer, buffer_length,
  58                                          timeout);
  59                 if (status >= 0)
  60                         return 0;
  61
  62                 /*
  63                  * Check for errors,
  64                  * -ETIMEDOUT: We need a bit more time to complete.
  65                  * -ENODEV: Device has disappeared, no point continuing.
  66                  */
  67                 if (status == -ETIMEDOUT)
  68                         timeout *= 2;
  69                 else if (status == -ENODEV)
  70                         break;
  71         }
  72
  73         ERROR(rt2x00dev,
  74               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
  75               request, offset, status);
  76
  77         return status;
  78 }
  79 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
  80
  81 int rt2x00usb_vendor_request_buff(const struct rt2x00_dev *rt2x00dev,
  82                                   const u8 request, const u8 requesttype,
  83                                   const u16 offset, void *buffer,
  84                                   const u16 buffer_length, u16 timeout)
  85 {
  86         int status;
  87
  88         /*
  89          * Check for Cache availability.
  90          */
  91         if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
  92                 ERROR(rt2x00dev, "CSR cache not available.\n");
  93                 return -ENOMEM;
  94         }
  95
  96         if (requesttype == USB_VENDOR_REQUEST_OUT)
  97                 memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
  98
  99         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
 100                                           offset, 0, rt2x00dev->csr_cache,
 101                                           buffer_length, timeout);
 102
 103         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
 104                 memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
 105
 106         return status;
 107 }
 108 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
 109
 110 /*
 111  * TX data handlers.
 112  */
 113 static void rt2x00usb_interrupt_txdone(struct urb *urb)
 114 {
 115         struct data_entry *entry = (struct data_entry *)urb->context;
 116         struct data_ring *ring = entry->ring;
 117         struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
 118         struct data_desc *txd = (struct data_desc *)entry->skb->data;
 119         u32 word;
 120         int tx_status;
 121
 122         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 123             !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
 124                 return;
 125
 126         rt2x00_desc_read(txd, 0, &word);
 127
 128         /*
 129          * Remove the descriptor data from the buffer.
 130          */
 131         skb_pull(entry->skb, ring->desc_size);
 132
 133         /*
 134          * Obtain the status about this packet.
 135          */
 136         tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
 137
 138         rt2x00lib_txdone(entry, tx_status, 0);
 139
 140         /*
 141          * Make this entry available for reuse.
 142          */
 143         entry->flags = 0;
 144         rt2x00_ring_index_done_inc(entry->ring);
 145
 146         /*
 147          * If the data ring was full before the txdone handler
 148          * we must make sure the packet queue in the mac80211 stack
 149          * is reenabled when the txdone handler has finished.
 150          */
 151         if (!rt2x00_ring_full(ring))
 152                 ieee80211_wake_queue(rt2x00dev->hw,
 153                                      entry->tx_status.control.queue);
 154 }
 155
 156 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
 157                             struct data_ring *ring, struct sk_buff *skb,
 158                             struct ieee80211_tx_control *control)
 159 {
 160         struct usb_device *usb_dev =
 161             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
 162         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 163         struct data_entry *entry = rt2x00_get_data_entry(ring);
 164         u32 length = skb->len;
 165
 166         if (rt2x00_ring_full(ring)) {
 167                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 168                 return -EINVAL;
 169         }
 170
 171         if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
 172                 ERROR(rt2x00dev,
 173                       "Arrived at non-free entry in the non-full queue %d.\n"
 174                       "Please file bug report to %s.\n",
 175                       control->queue, DRV_PROJECT);
 176                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 177                 return -EINVAL;
 178         }
 179
 180         /*
 181          * Add the descriptor in front of the skb.
 182          */
 183         skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
 184         memset(skb->data, 0x00, rt2x00dev->hw->extra_tx_headroom);
 185
 186         rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data,
 187                                 ieee80211hdr, length, control);
 188         memcpy(&entry->tx_status.control, control, sizeof(*control));
 189         entry->skb = skb;
 190
 191         /*
 192          * Length passed to usb_fill_urb cannot be an odd number,
 193          * so add 1 byte to make it even.
 194          */
 195         length += rt2x00dev->hw->extra_tx_headroom;
 196         if (length % 2)
 197                 length++;
 198
 199         __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 200         usb_fill_bulk_urb(entry->priv, usb_dev,
 201                           usb_sndbulkpipe(usb_dev, 1),
 202                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
 203         usb_submit_urb(entry->priv, GFP_ATOMIC);
 204
 205         rt2x00_ring_index_inc(ring);
 206
 207         if (rt2x00_ring_full(ring))
 208                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 209
 210         return 0;
 211 }
 212 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
 213
 214 /*
 215  * RX data handlers.
 216  */
 217 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
 218 {
 219         struct data_entry *entry = (struct data_entry *)urb->context;
 220         struct data_ring *ring = entry->ring;
 221         struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
 222         struct sk_buff *skb;
 223         struct rxdata_entry_desc desc;
 224         int frame_size;
 225
 226         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
 227             !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
 228                 return;
 229
 230         /*
 231          * Check if the received data is simply too small
 232          * to be actually valid, or if the urb is signaling
 233          * a problem.
 234          */
 235         if (urb->actual_length < entry->ring->desc_size || urb->status)
 236                 goto skip_entry;
 237
 238         memset(&desc, 0x00, sizeof(desc));
 239         rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 240
 241         /*
 242          * Allocate a new sk buffer to replace the current one.
 243          * If allocation fails, we should drop the current frame
 244          * so we can recycle the existing sk buffer for the new frame.
 245          */
 246         frame_size = entry->ring->data_size + entry->ring->desc_size;
 247         skb = dev_alloc_skb(frame_size + NET_IP_ALIGN);
 248         if (!skb)
 249                 goto skip_entry;
 250
 251         skb_reserve(skb, NET_IP_ALIGN);
 252         skb_put(skb, frame_size);
 253
 254         /*
 255          * Trim the skb_buffer to only contain the valid
 256          * frame data (so ignore the device's descriptor).
 257          */
 258         skb_trim(entry->skb, desc.size);
 259
 260         /*
 261          * Send the frame to rt2x00lib for further processing.
 262          */
 263         rt2x00lib_rxdone(entry, entry->skb, &desc);
 264
 265         /*
 266          * Replace current entry's skb with the newly allocated one,
 267          * and reinitialize the urb.
 268          */
 269         entry->skb = skb;
 270         urb->transfer_buffer = entry->skb->data;
 271         urb->transfer_buffer_length = entry->skb->len;
 272
 273 skip_entry:
 274         if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 275                 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 276                 usb_submit_urb(urb, GFP_ATOMIC);
 277         }
 278
 279         rt2x00_ring_index_inc(ring);
 280 }
 281
 282 /*
 283  * Radio handlers
 284  */
 285 void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
 286 {
 287         struct usb_device *usb_dev =
 288             interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
 289         struct data_ring *ring;
 290         struct data_entry *entry;
 291         unsigned int i;
 292
 293         /*
 294          * Initialize the TX rings
 295          */
 296         txringall_for_each(rt2x00dev, ring) {
 297                 for (i = 0; i < ring->stats.limit; i++)
 298                         ring->entry[i].flags = 0;
 299
 300                 rt2x00_ring_index_clear(ring);
 301         }
 302
 303         /*
 304          * Initialize and start the RX ring.
 305          */
 306         rt2x00_ring_index_clear(rt2x00dev->rx);
 307
 308         for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
 309                 entry = &rt2x00dev->rx->entry[i];
 310
 311                 usb_fill_bulk_urb(entry->priv, usb_dev,
 312                                   usb_rcvbulkpipe(usb_dev, 1),
 313                                   entry->skb->data, entry->skb->len,
 314                                   rt2x00usb_interrupt_rxdone, entry);
 315
 316                 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
 317                 usb_submit_urb(entry->priv, GFP_ATOMIC);
 318         }
 319 }
 320 EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
 321
 322 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 323 {
 324         struct data_ring *ring;
 325         unsigned int i;
 326
 327         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
 328                                     REGISTER_TIMEOUT);
 329
 330         /*
 331          * Cancel all rings.
 332          */
 333         ring_for_each(rt2x00dev, ring) {
 334                 for (i = 0; i < ring->stats.limit; i++)
 335                         usb_kill_urb(ring->entry[i].priv);
 336         }
 337 }
 338 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 339
 340 /*
 341  * Device initialization handlers.
 342  */
 343 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 344                                struct data_ring *ring)
 345 {
 346         unsigned int i;
 347
 348         /*
 349          * Allocate the URB's
 350          */
 351         for (i = 0; i < ring->stats.limit; i++) {
 352                 ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
 353                 if (!ring->entry[i].priv)
 354                         return -ENOMEM;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
 361                                struct data_ring *ring)
 362 {
 363         unsigned int i;
 364
 365         if (!ring->entry)
 366                 return;
 367
 368         for (i = 0; i < ring->stats.limit; i++) {
 369                 usb_kill_urb(ring->entry[i].priv);
 370                 usb_free_urb(ring->entry[i].priv);
 371                 if (ring->entry[i].skb)
 372                         kfree_skb(ring->entry[i].skb);
 373         }
 374 }
 375
 376 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
 377 {
 378         struct data_ring *ring;
 379         struct sk_buff *skb;
 380         unsigned int entry_size;
 381         unsigned int i;
 382         int status;
 383
 384         /*
 385          * Allocate DMA
 386          */
 387         ring_for_each(rt2x00dev, ring) {
 388                 status = rt2x00usb_alloc_urb(rt2x00dev, ring);
 389                 if (status)
 390                         goto exit;
 391         }
 392
 393         /*
 394          * For the RX ring, skb's should be allocated.
 395          */
 396         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
 397         for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
 398                 skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
 399                 if (!skb)
 400                         goto exit;
 401
 402                 skb_reserve(skb, NET_IP_ALIGN);
 403                 skb_put(skb, entry_size);
 404
 405                 rt2x00dev->rx->entry[i].skb = skb;
 406         }
 407
 408         return 0;
 409
 410 exit:
 411         rt2x00usb_uninitialize(rt2x00dev);
 412
 413         return status;
 414 }
 415 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
 416
 417 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
 418 {
 419         struct data_ring *ring;
 420
 421         ring_for_each(rt2x00dev, ring)
 422                 rt2x00usb_free_urb(rt2x00dev, ring);
 423 }
 424 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
 425
 426 /*
 427  * USB driver handlers.
 428  */
 429 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
 430 {
 431         kfree(rt2x00dev->rf);
 432         rt2x00dev->rf = NULL;
 433
 434         kfree(rt2x00dev->eeprom);
 435         rt2x00dev->eeprom = NULL;
 436
 437         kfree(rt2x00dev->csr_cache);
 438         rt2x00dev->csr_cache = NULL;
 439 }
 440
 441 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
 442 {
 443         rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
 444         if (!rt2x00dev->csr_cache)
 445                 goto exit;
 446
 447         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 448         if (!rt2x00dev->eeprom)
 449                 goto exit;
 450
 451         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 452         if (!rt2x00dev->rf)
 453                 goto exit;
 454
 455         return 0;
 456
 457 exit:
 458         ERROR_PROBE("Failed to allocate registers.\n");
 459
 460         rt2x00usb_free_reg(rt2x00dev);
 461
 462         return -ENOMEM;
 463 }
 464
 465 int rt2x00usb_probe(struct usb_interface *usb_intf,
 466                     const struct usb_device_id *id)
 467 {
 468         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
 469         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
 470         struct ieee80211_hw *hw;
 471         struct rt2x00_dev *rt2x00dev;
 472         int retval;
 473
 474         usb_dev = usb_get_dev(usb_dev);
 475
 476         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 477         if (!hw) {
 478                 ERROR_PROBE("Failed to allocate hardware.\n");
 479                 retval = -ENOMEM;
 480                 goto exit_put_device;
 481         }
 482
 483         usb_set_intfdata(usb_intf, hw);
 484
 485         rt2x00dev = hw->priv;
 486         rt2x00dev->dev = usb_intf;
 487         rt2x00dev->ops = ops;
 488         rt2x00dev->hw = hw;
 489
 490         retval = rt2x00usb_alloc_reg(rt2x00dev);
 491         if (retval)
 492                 goto exit_free_device;
 493
 494         retval = rt2x00lib_probe_dev(rt2x00dev);
 495         if (retval)
 496                 goto exit_free_reg;
 497
 498         return 0;
 499
 500 exit_free_reg:
 501         rt2x00usb_free_reg(rt2x00dev);
 502
 503 exit_free_device:
 504         ieee80211_free_hw(hw);
 505
 506 exit_put_device:
 507         usb_put_dev(usb_dev);
 508
 509         usb_set_intfdata(usb_intf, NULL);
 510
 511         return retval;
 512 }
 513 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
 514
 515 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
 516 {
 517         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 518         struct rt2x00_dev *rt2x00dev = hw->priv;
 519
 520         /*
 521          * Free all allocated data.
 522          */
 523         rt2x00lib_remove_dev(rt2x00dev);
 524         rt2x00usb_free_reg(rt2x00dev);
 525         ieee80211_free_hw(hw);
 526
 527         /*
 528          * Free the USB device data.
 529          */
 530         usb_set_intfdata(usb_intf, NULL);
 531         usb_put_dev(interface_to_usbdev(usb_intf));
 532 }
 533 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
 534
 535 #ifdef CONFIG_PM
 536 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
 537 {
 538         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 539         struct rt2x00_dev *rt2x00dev = hw->priv;
 540         int retval;
 541
 542         retval = rt2x00lib_suspend(rt2x00dev, state);
 543         if (retval)
 544                 return retval;
 545
 546         rt2x00usb_free_reg(rt2x00dev);
 547
 548         /*
 549          * Decrease usbdev refcount.
 550          */
 551         usb_put_dev(interface_to_usbdev(usb_intf));
 552
 553         return 0;
 554 }
 555 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
 556
 557 int rt2x00usb_resume(struct usb_interface *usb_intf)
 558 {
 559         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
 560         struct rt2x00_dev *rt2x00dev = hw->priv;
 561         int retval;
 562
 563         usb_get_dev(interface_to_usbdev(usb_intf));
 564
 565         retval = rt2x00usb_alloc_reg(rt2x00dev);
 566         if (retval)
 567                 return retval;
 568
 569         retval = rt2x00lib_resume(rt2x00dev);
 570         if (retval)
 571                 goto exit_free_reg;
 572
 573         return 0;
 574
 575 exit_free_reg:
 576         rt2x00usb_free_reg(rt2x00dev);
 577
 578         return retval;
 579 }
 580 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
 581 #endif /* CONFIG_PM */
 582
 583 /*
 584  * rt2x00pci module information.
 585  */
 586 MODULE_AUTHOR(DRV_PROJECT);
 587 MODULE_VERSION(DRV_VERSION);
 588 MODULE_DESCRIPTION("rt2x00 library");
 589 MODULE_LICENSE("GPL");