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