drivers/net/wireless/ath/carl9170/usb.c

   1 /*
   2  * Atheros CARL9170 driver
   3  *
   4  * USB - frontend
   5  *
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, see
  21  * http://www.gnu.org/licenses/.
  22  *
  23  * This file incorporates work covered by the following copyright and
  24  * permission notice:
  25  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
  26  *
  27  *    Permission to use, copy, modify, and/or distribute this software for any
  28  *    purpose with or without fee is hereby granted, provided that the above
  29  *    copyright notice and this permission notice appear in all copies.
  30  *
  31  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  32  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  33  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  34  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  35  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  36  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  37  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  38  */
  39
  40 #include <linux/module.h>
  41 #include <linux/slab.h>
  42 #include <linux/usb.h>
  43 #include <linux/firmware.h>
  44 #include <linux/etherdevice.h>
  45 #include <linux/device.h>
  46 #include <net/mac80211.h>
  47 #include "carl9170.h"
  48 #include "cmd.h"
  49 #include "hw.h"
  50 #include "fwcmd.h"
  51
  52 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  53 MODULE_AUTHOR("Christian Lamparter <chunkeey@googlemail.com>");
  54 MODULE_LICENSE("GPL");
  55 MODULE_DESCRIPTION("Atheros AR9170 802.11n USB wireless");
  56 MODULE_FIRMWARE(CARL9170FW_NAME);
  57 MODULE_ALIAS("ar9170usb");
  58 MODULE_ALIAS("arusb_lnx");
  59
  60 /*
  61  * Note:
  62  *
  63  * Always update our wiki's device list (located at:
  64  * http://wireless.kernel.org/en/users/Drivers/ar9170/devices ),
  65  * whenever you add a new device.
  66  */
  67 static struct usb_device_id carl9170_usb_ids[] = {
  68         /* Atheros 9170 */
  69         { USB_DEVICE(0x0cf3, 0x9170) },
  70         /* Atheros TG121N */
  71         { USB_DEVICE(0x0cf3, 0x1001) },
  72         /* TP-Link TL-WN821N v2 */
  73         { USB_DEVICE(0x0cf3, 0x1002), .driver_info = CARL9170_WPS_BUTTON |
  74                  CARL9170_ONE_LED },
  75         /* 3Com Dual Band 802.11n USB Adapter */
  76         { USB_DEVICE(0x0cf3, 0x1010) },
  77         /* H3C Dual Band 802.11n USB Adapter */
  78         { USB_DEVICE(0x0cf3, 0x1011) },
  79         /* Cace Airpcap NX */
  80         { USB_DEVICE(0xcace, 0x0300) },
  81         /* D-Link DWA 160 A1 */
  82         { USB_DEVICE(0x07d1, 0x3c10) },
  83         /* D-Link DWA 160 A2 */
  84         { USB_DEVICE(0x07d1, 0x3a09) },
  85         /* D-Link DWA 130 D */
  86         { USB_DEVICE(0x07d1, 0x3a0f) },
  87         /* Netgear WNA1000 */
  88         { USB_DEVICE(0x0846, 0x9040) },
  89         /* Netgear WNDA3100 (v1) */
  90         { USB_DEVICE(0x0846, 0x9010) },
  91         /* Netgear WN111 v2 */
  92         { USB_DEVICE(0x0846, 0x9001), .driver_info = CARL9170_ONE_LED },
  93         /* Zydas ZD1221 */
  94         { USB_DEVICE(0x0ace, 0x1221) },
  95         /* Proxim ORiNOCO 802.11n USB */
  96         { USB_DEVICE(0x1435, 0x0804) },
  97         /* WNC Generic 11n USB Dongle */
  98         { USB_DEVICE(0x1435, 0x0326) },
  99         /* ZyXEL NWD271N */
 100         { USB_DEVICE(0x0586, 0x3417) },
 101         /* Z-Com UB81 BG */
 102         { USB_DEVICE(0x0cde, 0x0023) },
 103         /* Z-Com UB82 ABG */
 104         { USB_DEVICE(0x0cde, 0x0026) },
 105         /* Sphairon Homelink 1202 */
 106         { USB_DEVICE(0x0cde, 0x0027) },
 107         /* Arcadyan WN7512 */
 108         { USB_DEVICE(0x083a, 0xf522) },
 109         /* Planex GWUS300 */
 110         { USB_DEVICE(0x2019, 0x5304) },
 111         /* IO-Data WNGDNUS2 */
 112         { USB_DEVICE(0x04bb, 0x093f) },
 113         /* NEC WL300NU-G */
 114         { USB_DEVICE(0x0409, 0x0249) },
 115         /* NEC WL300NU-AG */
 116         { USB_DEVICE(0x0409, 0x02b4) },
 117         /* AVM FRITZ!WLAN USB Stick N */
 118         { USB_DEVICE(0x057c, 0x8401) },
 119         /* AVM FRITZ!WLAN USB Stick N 2.4 */
 120         { USB_DEVICE(0x057c, 0x8402) },
 121         /* Qwest/Actiontec 802AIN Wireless N USB Network Adapter */
 122         { USB_DEVICE(0x1668, 0x1200) },
 123         /* Airlive X.USB a/b/g/n */
 124         { USB_DEVICE(0x1b75, 0x9170) },
 125
 126         /* terminate */
 127         {}
 128 };
 129 MODULE_DEVICE_TABLE(usb, carl9170_usb_ids);
 130
 131 static void carl9170_usb_submit_data_urb(struct ar9170 *ar)
 132 {
 133         struct urb *urb;
 134         int err;
 135
 136         if (atomic_inc_return(&ar->tx_anch_urbs) > AR9170_NUM_TX_URBS)
 137                 goto err_acc;
 138
 139         urb = usb_get_from_anchor(&ar->tx_wait);
 140         if (!urb)
 141                 goto err_acc;
 142
 143         usb_anchor_urb(urb, &ar->tx_anch);
 144
 145         err = usb_submit_urb(urb, GFP_ATOMIC);
 146         if (unlikely(err)) {
 147                 if (net_ratelimit()) {
 148                         dev_err(&ar->udev->dev, "tx submit failed (%d)\n",
 149                                 urb->status);
 150                 }
 151
 152                 usb_unanchor_urb(urb);
 153                 usb_anchor_urb(urb, &ar->tx_err);
 154         }
 155
 156         usb_free_urb(urb);
 157
 158         if (likely(err == 0))
 159                 return;
 160
 161 err_acc:
 162         atomic_dec(&ar->tx_anch_urbs);
 163 }
 164
 165 static void carl9170_usb_tx_data_complete(struct urb *urb)
 166 {
 167         struct ar9170 *ar = usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 168
 169         if (WARN_ON_ONCE(!ar)) {
 170                 dev_kfree_skb_irq(urb->context);
 171                 return;
 172         }
 173
 174         atomic_dec(&ar->tx_anch_urbs);
 175
 176         switch (urb->status) {
 177         /* everything is fine */
 178         case 0:
 179                 carl9170_tx_callback(ar, (void *)urb->context);
 180                 break;
 181
 182         /* disconnect */
 183         case -ENOENT:
 184         case -ECONNRESET:
 185         case -ENODEV:
 186         case -ESHUTDOWN:
 187                 /*
 188                  * Defer the frame clean-up to the tasklet worker.
 189                  * This is necessary, because carl9170_tx_drop
 190                  * does not work in an irqsave context.
 191                  */
 192                 usb_anchor_urb(urb, &ar->tx_err);
 193                 return;
 194
 195         /* a random transmission error has occurred? */
 196         default:
 197                 if (net_ratelimit()) {
 198                         dev_err(&ar->udev->dev, "tx failed (%d)\n",
 199                                 urb->status);
 200                 }
 201
 202                 usb_anchor_urb(urb, &ar->tx_err);
 203                 break;
 204         }
 205
 206         if (likely(IS_STARTED(ar)))
 207                 carl9170_usb_submit_data_urb(ar);
 208 }
 209
 210 static int carl9170_usb_submit_cmd_urb(struct ar9170 *ar)
 211 {
 212         struct urb *urb;
 213         int err;
 214
 215         if (atomic_inc_return(&ar->tx_cmd_urbs) != 1) {
 216                 atomic_dec(&ar->tx_cmd_urbs);
 217                 return 0;
 218         }
 219
 220         urb = usb_get_from_anchor(&ar->tx_cmd);
 221         if (!urb) {
 222                 atomic_dec(&ar->tx_cmd_urbs);
 223                 return 0;
 224         }
 225
 226         usb_anchor_urb(urb, &ar->tx_anch);
 227         err = usb_submit_urb(urb, GFP_ATOMIC);
 228         if (unlikely(err)) {
 229                 usb_unanchor_urb(urb);
 230                 atomic_dec(&ar->tx_cmd_urbs);
 231         }
 232         usb_free_urb(urb);
 233
 234         return err;
 235 }
 236
 237 static void carl9170_usb_cmd_complete(struct urb *urb)
 238 {
 239         struct ar9170 *ar = urb->context;
 240         int err = 0;
 241
 242         if (WARN_ON_ONCE(!ar))
 243                 return;
 244
 245         atomic_dec(&ar->tx_cmd_urbs);
 246
 247         switch (urb->status) {
 248         /* everything is fine */
 249         case 0:
 250                 break;
 251
 252         /* disconnect */
 253         case -ENOENT:
 254         case -ECONNRESET:
 255         case -ENODEV:
 256         case -ESHUTDOWN:
 257                 return;
 258
 259         default:
 260                 err = urb->status;
 261                 break;
 262         }
 263
 264         if (!IS_INITIALIZED(ar))
 265                 return;
 266
 267         if (err)
 268                 dev_err(&ar->udev->dev, "submit cmd cb failed (%d).\n", err);
 269
 270         err = carl9170_usb_submit_cmd_urb(ar);
 271         if (err)
 272                 dev_err(&ar->udev->dev, "submit cmd failed (%d).\n", err);
 273 }
 274
 275 static void carl9170_usb_rx_irq_complete(struct urb *urb)
 276 {
 277         struct ar9170 *ar = urb->context;
 278
 279         if (WARN_ON_ONCE(!ar))
 280                 return;
 281
 282         switch (urb->status) {
 283         /* everything is fine */
 284         case 0:
 285                 break;
 286
 287         /* disconnect */
 288         case -ENOENT:
 289         case -ECONNRESET:
 290         case -ENODEV:
 291         case -ESHUTDOWN:
 292                 return;
 293
 294         default:
 295                 goto resubmit;
 296         }
 297
 298         carl9170_handle_command_response(ar, urb->transfer_buffer,
 299                                          urb->actual_length);
 300
 301 resubmit:
 302         usb_anchor_urb(urb, &ar->rx_anch);
 303         if (unlikely(usb_submit_urb(urb, GFP_ATOMIC)))
 304                 usb_unanchor_urb(urb);
 305 }
 306
 307 static int carl9170_usb_submit_rx_urb(struct ar9170 *ar, gfp_t gfp)
 308 {
 309         struct urb *urb;
 310         int err = 0, runs = 0;
 311
 312         while ((atomic_read(&ar->rx_anch_urbs) < AR9170_NUM_RX_URBS) &&
 313                 (runs++ < AR9170_NUM_RX_URBS)) {
 314                 err = -ENOSPC;
 315                 urb = usb_get_from_anchor(&ar->rx_pool);
 316                 if (urb) {
 317                         usb_anchor_urb(urb, &ar->rx_anch);
 318                         err = usb_submit_urb(urb, gfp);
 319                         if (unlikely(err)) {
 320                                 usb_unanchor_urb(urb);
 321                                 usb_anchor_urb(urb, &ar->rx_pool);
 322                         } else {
 323                                 atomic_dec(&ar->rx_pool_urbs);
 324                                 atomic_inc(&ar->rx_anch_urbs);
 325                         }
 326                         usb_free_urb(urb);
 327                 }
 328         }
 329
 330         return err;
 331 }
 332
 333 static void carl9170_usb_rx_work(struct ar9170 *ar)
 334 {
 335         struct urb *urb;
 336         int i;
 337
 338         for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
 339                 urb = usb_get_from_anchor(&ar->rx_work);
 340                 if (!urb)
 341                         break;
 342
 343                 atomic_dec(&ar->rx_work_urbs);
 344                 if (IS_INITIALIZED(ar)) {
 345                         carl9170_rx(ar, urb->transfer_buffer,
 346                                     urb->actual_length);
 347                 }
 348
 349                 usb_anchor_urb(urb, &ar->rx_pool);
 350                 atomic_inc(&ar->rx_pool_urbs);
 351
 352                 usb_free_urb(urb);
 353
 354                 carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
 355         }
 356 }
 357
 358 void carl9170_usb_handle_tx_err(struct ar9170 *ar)
 359 {
 360         struct urb *urb;
 361
 362         while ((urb = usb_get_from_anchor(&ar->tx_err))) {
 363                 struct sk_buff *skb = (void *)urb->context;
 364
 365                 carl9170_tx_drop(ar, skb);
 366                 carl9170_tx_callback(ar, skb);
 367                 usb_free_urb(urb);
 368         }
 369 }
 370
 371 static void carl9170_usb_tasklet(unsigned long data)
 372 {
 373         struct ar9170 *ar = (struct ar9170 *) data;
 374
 375         if (!IS_INITIALIZED(ar))
 376                 return;
 377
 378         carl9170_usb_rx_work(ar);
 379
 380         /*
 381          * Strictly speaking: The tx scheduler is not part of the USB system.
 382          * But the rx worker returns frames back to the mac80211-stack and
 383          * this is the _perfect_ place to generate the next transmissions.
 384          */
 385         if (IS_STARTED(ar))
 386                 carl9170_tx_scheduler(ar);
 387 }
 388
 389 static void carl9170_usb_rx_complete(struct urb *urb)
 390 {
 391         struct ar9170 *ar = (struct ar9170 *)urb->context;
 392         int err;
 393
 394         if (WARN_ON_ONCE(!ar))
 395                 return;
 396
 397         atomic_dec(&ar->rx_anch_urbs);
 398
 399         switch (urb->status) {
 400         case 0:
 401                 /* rx path */
 402                 usb_anchor_urb(urb, &ar->rx_work);
 403                 atomic_inc(&ar->rx_work_urbs);
 404                 break;
 405
 406         case -ENOENT:
 407         case -ECONNRESET:
 408         case -ENODEV:
 409         case -ESHUTDOWN:
 410                 /* handle disconnect events*/
 411                 return;
 412
 413         default:
 414                 /* handle all other errors */
 415                 usb_anchor_urb(urb, &ar->rx_pool);
 416                 atomic_inc(&ar->rx_pool_urbs);
 417                 break;
 418         }
 419
 420         err = carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
 421         if (unlikely(err)) {
 422                 /*
 423                  * usb_submit_rx_urb reported a problem.
 424                  * In case this is due to a rx buffer shortage,
 425                  * elevate the tasklet worker priority to
 426                  * the highest available level.
 427                  */
 428                 tasklet_hi_schedule(&ar->usb_tasklet);
 429
 430                 if (atomic_read(&ar->rx_anch_urbs) == 0) {
 431                         /*
 432                          * The system is too slow to cope with
 433                          * the enormous workload. We have simply
 434                          * run out of active rx urbs and this
 435                          * unfortunately leads to an unpredictable
 436                          * device.
 437                          */
 438
 439                         ieee80211_queue_work(ar->hw, &ar->ping_work);
 440                 }
 441         } else {
 442                 /*
 443                  * Using anything less than _high_ priority absolutely
 444                  * kills the rx performance my UP-System...
 445                  */
 446                 tasklet_hi_schedule(&ar->usb_tasklet);
 447         }
 448 }
 449
 450 static struct urb *carl9170_usb_alloc_rx_urb(struct ar9170 *ar, gfp_t gfp)
 451 {
 452         struct urb *urb;
 453         void *buf;
 454
 455         buf = kmalloc(ar->fw.rx_size, gfp);
 456         if (!buf)
 457                 return NULL;
 458
 459         urb = usb_alloc_urb(0, gfp);
 460         if (!urb) {
 461                 kfree(buf);
 462                 return NULL;
 463         }
 464
 465         usb_fill_bulk_urb(urb, ar->udev, usb_rcvbulkpipe(ar->udev,
 466                           AR9170_USB_EP_RX), buf, ar->fw.rx_size,
 467                           carl9170_usb_rx_complete, ar);
 468
 469         urb->transfer_flags |= URB_FREE_BUFFER;
 470
 471         return urb;
 472 }
 473
 474 static int carl9170_usb_send_rx_irq_urb(struct ar9170 *ar)
 475 {
 476         struct urb *urb = NULL;
 477         void *ibuf;
 478         int err = -ENOMEM;
 479
 480         urb = usb_alloc_urb(0, GFP_KERNEL);
 481         if (!urb)
 482                 goto out;
 483
 484         ibuf = kmalloc(AR9170_USB_EP_CTRL_MAX, GFP_KERNEL);
 485         if (!ibuf)
 486                 goto out;
 487
 488         usb_fill_int_urb(urb, ar->udev, usb_rcvintpipe(ar->udev,
 489                          AR9170_USB_EP_IRQ), ibuf, AR9170_USB_EP_CTRL_MAX,
 490                          carl9170_usb_rx_irq_complete, ar, 1);
 491
 492         urb->transfer_flags |= URB_FREE_BUFFER;
 493
 494         usb_anchor_urb(urb, &ar->rx_anch);
 495         err = usb_submit_urb(urb, GFP_KERNEL);
 496         if (err)
 497                 usb_unanchor_urb(urb);
 498
 499 out:
 500         usb_free_urb(urb);
 501         return err;
 502 }
 503
 504 static int carl9170_usb_init_rx_bulk_urbs(struct ar9170 *ar)
 505 {
 506         struct urb *urb;
 507         int i, err = -EINVAL;
 508
 509         /*
 510          * The driver actively maintains a second shadow
 511          * pool for inactive, but fully-prepared rx urbs.
 512          *
 513          * The pool should help the driver to master huge
 514          * workload spikes without running the risk of
 515          * undersupplying the hardware or wasting time by
 516          * processing rx data (streams) inside the urb
 517          * completion (hardirq context).
 518          */
 519         for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
 520                 urb = carl9170_usb_alloc_rx_urb(ar, GFP_KERNEL);
 521                 if (!urb) {
 522                         err = -ENOMEM;
 523                         goto err_out;
 524                 }
 525
 526                 usb_anchor_urb(urb, &ar->rx_pool);
 527                 atomic_inc(&ar->rx_pool_urbs);
 528                 usb_free_urb(urb);
 529         }
 530
 531         err = carl9170_usb_submit_rx_urb(ar, GFP_KERNEL);
 532         if (err)
 533                 goto err_out;
 534
 535         /* the device now waiting for the firmware. */
 536         carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
 537         return 0;
 538
 539 err_out:
 540
 541         usb_scuttle_anchored_urbs(&ar->rx_pool);
 542         usb_scuttle_anchored_urbs(&ar->rx_work);
 543         usb_kill_anchored_urbs(&ar->rx_anch);
 544         return err;
 545 }
 546
 547 static int carl9170_usb_flush(struct ar9170 *ar)
 548 {
 549         struct urb *urb;
 550         int ret, err = 0;
 551
 552         while ((urb = usb_get_from_anchor(&ar->tx_wait))) {
 553                 struct sk_buff *skb = (void *)urb->context;
 554                 carl9170_tx_drop(ar, skb);
 555                 carl9170_tx_callback(ar, skb);
 556                 usb_free_urb(urb);
 557         }
 558
 559         ret = usb_wait_anchor_empty_timeout(&ar->tx_cmd, 1000);
 560         if (ret == 0)
 561                 err = -ETIMEDOUT;
 562
 563         /* lets wait a while until the tx - queues are dried out */
 564         ret = usb_wait_anchor_empty_timeout(&ar->tx_anch, 1000);
 565         if (ret == 0)
 566                 err = -ETIMEDOUT;
 567
 568         usb_kill_anchored_urbs(&ar->tx_anch);
 569         carl9170_usb_handle_tx_err(ar);
 570
 571         return err;
 572 }
 573
 574 static void carl9170_usb_cancel_urbs(struct ar9170 *ar)
 575 {
 576         int err;
 577
 578         carl9170_set_state(ar, CARL9170_UNKNOWN_STATE);
 579
 580         err = carl9170_usb_flush(ar);
 581         if (err)
 582                 dev_err(&ar->udev->dev, "stuck tx urbs!\n");
 583
 584         usb_poison_anchored_urbs(&ar->tx_anch);
 585         carl9170_usb_handle_tx_err(ar);
 586         usb_poison_anchored_urbs(&ar->rx_anch);
 587
 588         tasklet_kill(&ar->usb_tasklet);
 589
 590         usb_scuttle_anchored_urbs(&ar->rx_work);
 591         usb_scuttle_anchored_urbs(&ar->rx_pool);
 592         usb_scuttle_anchored_urbs(&ar->tx_cmd);
 593 }
 594
 595 int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
 596                         const bool free_buf)
 597 {
 598         struct urb *urb;
 599         int err = 0;
 600
 601         if (!IS_INITIALIZED(ar)) {
 602                 err = -EPERM;
 603                 goto err_free;
 604         }
 605
 606         if (WARN_ON(cmd->hdr.len > CARL9170_MAX_CMD_LEN - 4)) {
 607                 err = -EINVAL;
 608                 goto err_free;
 609         }
 610
 611         urb = usb_alloc_urb(0, GFP_ATOMIC);
 612         if (!urb) {
 613                 err = -ENOMEM;
 614                 goto err_free;
 615         }
 616
 617         usb_fill_int_urb(urb, ar->udev, usb_sndintpipe(ar->udev,
 618                 AR9170_USB_EP_CMD), cmd, cmd->hdr.len + 4,
 619                 carl9170_usb_cmd_complete, ar, 1);
 620
 621         if (free_buf)
 622                 urb->transfer_flags |= URB_FREE_BUFFER;
 623
 624         usb_anchor_urb(urb, &ar->tx_cmd);
 625         usb_free_urb(urb);
 626
 627         return carl9170_usb_submit_cmd_urb(ar);
 628
 629 err_free:
 630         if (free_buf)
 631                 kfree(cmd);
 632
 633         return err;
 634 }
 635
 636 int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids cmd,
 637         unsigned int plen, void *payload, unsigned int outlen, void *out)
 638 {
 639         int err = -ENOMEM;
 640
 641         if (!IS_ACCEPTING_CMD(ar))
 642                 return -EIO;
 643
 644         if (!(cmd & CARL9170_CMD_ASYNC_FLAG))
 645                 might_sleep();
 646
 647         ar->cmd.hdr.len = plen;
 648         ar->cmd.hdr.cmd = cmd;
 649         /* writing multiple regs fills this buffer already */
 650         if (plen && payload != (u8 *)(ar->cmd.data))
 651                 memcpy(ar->cmd.data, payload, plen);
 652
 653         spin_lock_bh(&ar->cmd_lock);
 654         ar->readbuf = (u8 *)out;
 655         ar->readlen = outlen;
 656         spin_unlock_bh(&ar->cmd_lock);
 657
 658         err = __carl9170_exec_cmd(ar, &ar->cmd, false);
 659
 660         if (!(cmd & CARL9170_CMD_ASYNC_FLAG)) {
 661                 err = wait_for_completion_timeout(&ar->cmd_wait, HZ);
 662                 if (err == 0) {
 663                         err = -ETIMEDOUT;
 664                         goto err_unbuf;
 665                 }
 666
 667                 if (ar->readlen != outlen) {
 668                         err = -EMSGSIZE;
 669                         goto err_unbuf;
 670                 }
 671         }
 672
 673         return 0;
 674
 675 err_unbuf:
 676         /* Maybe the device was removed in the moment we were waiting? */
 677         if (IS_STARTED(ar)) {
 678                 dev_err(&ar->udev->dev, "no command feedback "
 679                         "received (%d).\n", err);
 680
 681                 /* provide some maybe useful debug information */
 682                 print_hex_dump_bytes("carl9170 cmd: ", DUMP_PREFIX_NONE,
 683                                      &ar->cmd, plen + 4);
 684
 685                 carl9170_restart(ar, CARL9170_RR_COMMAND_TIMEOUT);
 686         }
 687
 688         /* invalidate to avoid completing the next command prematurely */
 689         spin_lock_bh(&ar->cmd_lock);
 690         ar->readbuf = NULL;
 691         ar->readlen = 0;
 692         spin_unlock_bh(&ar->cmd_lock);
 693
 694         return err;
 695 }
 696
 697 void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
 698 {
 699         struct urb *urb;
 700         struct ar9170_stream *tx_stream;
 701         void *data;
 702         unsigned int len;
 703
 704         if (!IS_STARTED(ar))
 705                 goto err_drop;
 706
 707         urb = usb_alloc_urb(0, GFP_ATOMIC);
 708         if (!urb)
 709                 goto err_drop;
 710
 711         if (ar->fw.tx_stream) {
 712                 tx_stream = (void *) (skb->data - sizeof(*tx_stream));
 713
 714                 len = skb->len + sizeof(*tx_stream);
 715                 tx_stream->length = cpu_to_le16(len);
 716                 tx_stream->tag = cpu_to_le16(AR9170_TX_STREAM_TAG);
 717                 data = tx_stream;
 718         } else {
 719                 data = skb->data;
 720                 len = skb->len;
 721         }
 722
 723         usb_fill_bulk_urb(urb, ar->udev, usb_sndbulkpipe(ar->udev,
 724                 AR9170_USB_EP_TX), data, len,
 725                 carl9170_usb_tx_data_complete, skb);
 726
 727         urb->transfer_flags |= URB_ZERO_PACKET;
 728
 729         usb_anchor_urb(urb, &ar->tx_wait);
 730
 731         usb_free_urb(urb);
 732
 733         carl9170_usb_submit_data_urb(ar);
 734         return;
 735
 736 err_drop:
 737         carl9170_tx_drop(ar, skb);
 738         carl9170_tx_callback(ar, skb);
 739 }
 740
 741 static void carl9170_release_firmware(struct ar9170 *ar)
 742 {
 743         if (ar->fw.fw) {
 744                 release_firmware(ar->fw.fw);
 745                 memset(&ar->fw, 0, sizeof(ar->fw));
 746         }
 747 }
 748
 749 void carl9170_usb_stop(struct ar9170 *ar)
 750 {
 751         int ret;
 752
 753         carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STOPPED);
 754
 755         ret = carl9170_usb_flush(ar);
 756         if (ret)
 757                 dev_err(&ar->udev->dev, "kill pending tx urbs.\n");
 758
 759         usb_poison_anchored_urbs(&ar->tx_anch);
 760         carl9170_usb_handle_tx_err(ar);
 761
 762         /* kill any pending command */
 763         spin_lock_bh(&ar->cmd_lock);
 764         ar->readlen = 0;
 765         spin_unlock_bh(&ar->cmd_lock);
 766         complete_all(&ar->cmd_wait);
 767
 768         /* This is required to prevent an early completion on _start */
 769         INIT_COMPLETION(ar->cmd_wait);
 770
 771         /*
 772          * Note:
 773          * So far we freed all tx urbs, but we won't dare to touch any rx urbs.
 774          * Else we would end up with a unresponsive device...
 775          */
 776 }
 777
 778 int carl9170_usb_open(struct ar9170 *ar)
 779 {
 780         usb_unpoison_anchored_urbs(&ar->tx_anch);
 781
 782         carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
 783         return 0;
 784 }
 785
 786 static int carl9170_usb_load_firmware(struct ar9170 *ar)
 787 {
 788         const u8 *data;
 789         u8 *buf;
 790         unsigned int transfer;
 791         size_t len;
 792         u32 addr;
 793         int err = 0;
 794
 795         buf = kmalloc(4096, GFP_KERNEL);
 796         if (!buf) {
 797                 err = -ENOMEM;
 798                 goto err_out;
 799         }
 800
 801         data = ar->fw.fw->data;
 802         len = ar->fw.fw->size;
 803         addr = ar->fw.address;
 804
 805         /* this removes the miniboot image */
 806         data += ar->fw.offset;
 807         len -= ar->fw.offset;
 808
 809         while (len) {
 810                 transfer = min_t(unsigned int, len, 4096u);
 811                 memcpy(buf, data, transfer);
 812
 813                 err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
 814                                       0x30 /* FW DL */, 0x40 | USB_DIR_OUT,
 815                                       addr >> 8, 0, buf, transfer, 100);
 816
 817                 if (err < 0) {
 818                         kfree(buf);
 819                         goto err_out;
 820                 }
 821
 822                 len -= transfer;
 823                 data += transfer;
 824                 addr += transfer;
 825         }
 826         kfree(buf);
 827
 828         err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
 829                               0x31 /* FW DL COMPLETE */,
 830                               0x40 | USB_DIR_OUT, 0, 0, NULL, 0, 200);
 831
 832         if (wait_for_completion_timeout(&ar->fw_boot_wait, HZ) == 0) {
 833                 err = -ETIMEDOUT;
 834                 goto err_out;
 835         }
 836
 837         err = carl9170_echo_test(ar, 0x4a110123);
 838         if (err)
 839                 goto err_out;
 840
 841         /* now, start the command response counter */
 842         ar->cmd_seq = -1;
 843
 844         return 0;
 845
 846 err_out:
 847         dev_err(&ar->udev->dev, "firmware upload failed (%d).\n", err);
 848         return err;
 849 }
 850
 851 int carl9170_usb_restart(struct ar9170 *ar)
 852 {
 853         int err = 0;
 854
 855         if (ar->intf->condition != USB_INTERFACE_BOUND)
 856                 return 0;
 857
 858         /*
 859          * Disable the command response sequence counter check.
 860          * We already know that the device/firmware is in a bad state.
 861          * So, no extra points are awarded to anyone who reminds the
 862          * driver about that.
 863          */
 864         ar->cmd_seq = -2;
 865
 866         err = carl9170_reboot(ar);
 867
 868         carl9170_usb_stop(ar);
 869
 870         if (err)
 871                 goto err_out;
 872
 873         tasklet_schedule(&ar->usb_tasklet);
 874
 875         /* The reboot procedure can take quite a while to complete. */
 876         msleep(1100);
 877
 878         err = carl9170_usb_open(ar);
 879         if (err)
 880                 goto err_out;
 881
 882         err = carl9170_usb_load_firmware(ar);
 883         if (err)
 884                 goto err_out;
 885
 886         return 0;
 887
 888 err_out:
 889         carl9170_usb_cancel_urbs(ar);
 890         return err;
 891 }
 892
 893 void carl9170_usb_reset(struct ar9170 *ar)
 894 {
 895         /*
 896          * This is the last resort to get the device going again
 897          * without any *user replugging action*.
 898          *
 899          * But there is a catch: usb_reset really is like a physical
 900          * *reconnect*. The mac80211 state will be lost in the process.
 901          * Therefore a userspace application, which is monitoring
 902          * the link must step in.
 903          */
 904         carl9170_usb_cancel_urbs(ar);
 905
 906         carl9170_usb_stop(ar);
 907
 908         usb_queue_reset_device(ar->intf);
 909 }
 910
 911 static int carl9170_usb_init_device(struct ar9170 *ar)
 912 {
 913         int err;
 914
 915         /*
 916          * The carl9170 firmware let's the driver know when it's
 917          * ready for action. But we have to be prepared to gracefully
 918          * handle all spurious [flushed] messages after each (re-)boot.
 919          * Thus the command response counter remains disabled until it
 920          * can be safely synchronized.
 921          */
 922         ar->cmd_seq = -2;
 923
 924         err = carl9170_usb_send_rx_irq_urb(ar);
 925         if (err)
 926                 goto err_out;
 927
 928         err = carl9170_usb_init_rx_bulk_urbs(ar);
 929         if (err)
 930                 goto err_unrx;
 931
 932         err = carl9170_usb_open(ar);
 933         if (err)
 934                 goto err_unrx;
 935
 936         mutex_lock(&ar->mutex);
 937         err = carl9170_usb_load_firmware(ar);
 938         mutex_unlock(&ar->mutex);
 939         if (err)
 940                 goto err_stop;
 941
 942         return 0;
 943
 944 err_stop:
 945         carl9170_usb_stop(ar);
 946
 947 err_unrx:
 948         carl9170_usb_cancel_urbs(ar);
 949
 950 err_out:
 951         return err;
 952 }
 953
 954 static void carl9170_usb_firmware_failed(struct ar9170 *ar)
 955 {
 956         struct device *parent = ar->udev->dev.parent;
 957         struct usb_device *udev;
 958
 959         /*
 960          * Store a copy of the usb_device pointer locally.
 961          * This is because device_release_driver initiates
 962          * carl9170_usb_disconnect, which in turn frees our
 963          * driver context (ar).
 964          */
 965         udev = ar->udev;
 966
 967         complete(&ar->fw_load_wait);
 968
 969         /* unbind anything failed */
 970         if (parent)
 971                 device_lock(parent);
 972
 973         device_release_driver(&udev->dev);
 974         if (parent)
 975                 device_unlock(parent);
 976
 977         usb_put_dev(udev);
 978 }
 979
 980 static void carl9170_usb_firmware_finish(struct ar9170 *ar)
 981 {
 982         int err;
 983
 984         err = carl9170_parse_firmware(ar);
 985         if (err)
 986                 goto err_freefw;
 987
 988         err = carl9170_usb_init_device(ar);
 989         if (err)
 990                 goto err_freefw;
 991
 992         err = carl9170_register(ar);
 993
 994         carl9170_usb_stop(ar);
 995         if (err)
 996                 goto err_unrx;
 997
 998         complete(&ar->fw_load_wait);
 999         usb_put_dev(ar->udev);
1000         return;
1001
1002 err_unrx:
1003         carl9170_usb_cancel_urbs(ar);
1004
1005 err_freefw:
1006         carl9170_release_firmware(ar);
1007         carl9170_usb_firmware_failed(ar);
1008 }
1009
1010 static void carl9170_usb_firmware_step2(const struct firmware *fw,
1011                                         void *context)
1012 {
1013         struct ar9170 *ar = context;
1014
1015         if (fw) {
1016                 ar->fw.fw = fw;
1017                 carl9170_usb_firmware_finish(ar);
1018                 return;
1019         }
1020
1021         dev_err(&ar->udev->dev, "firmware not found.\n");
1022         carl9170_usb_firmware_failed(ar);
1023 }
1024
1025 static int carl9170_usb_probe(struct usb_interface *intf,
1026                               const struct usb_device_id *id)
1027 {
1028         struct ar9170 *ar;
1029         struct usb_device *udev;
1030         int err;
1031
1032         err = usb_reset_device(interface_to_usbdev(intf));
1033         if (err)
1034                 return err;
1035
1036         ar = carl9170_alloc(sizeof(*ar));
1037         if (IS_ERR(ar))
1038                 return PTR_ERR(ar);
1039
1040         udev = interface_to_usbdev(intf);
1041         usb_get_dev(udev);
1042         ar->udev = udev;
1043         ar->intf = intf;
1044         ar->features = id->driver_info;
1045
1046         usb_set_intfdata(intf, ar);
1047         SET_IEEE80211_DEV(ar->hw, &intf->dev);
1048
1049         init_usb_anchor(&ar->rx_anch);
1050         init_usb_anchor(&ar->rx_pool);
1051         init_usb_anchor(&ar->rx_work);
1052         init_usb_anchor(&ar->tx_wait);
1053         init_usb_anchor(&ar->tx_anch);
1054         init_usb_anchor(&ar->tx_cmd);
1055         init_usb_anchor(&ar->tx_err);
1056         init_completion(&ar->cmd_wait);
1057         init_completion(&ar->fw_boot_wait);
1058         init_completion(&ar->fw_load_wait);
1059         tasklet_init(&ar->usb_tasklet, carl9170_usb_tasklet,
1060                      (unsigned long)ar);
1061
1062         atomic_set(&ar->tx_cmd_urbs, 0);
1063         atomic_set(&ar->tx_anch_urbs, 0);
1064         atomic_set(&ar->rx_work_urbs, 0);
1065         atomic_set(&ar->rx_anch_urbs, 0);
1066         atomic_set(&ar->rx_pool_urbs, 0);
1067
1068         usb_get_dev(ar->udev);
1069
1070         carl9170_set_state(ar, CARL9170_STOPPED);
1071
1072         return request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
1073                 &ar->udev->dev, GFP_KERNEL, ar, carl9170_usb_firmware_step2);
1074 }
1075
1076 static void carl9170_usb_disconnect(struct usb_interface *intf)
1077 {
1078         struct ar9170 *ar = usb_get_intfdata(intf);
1079         struct usb_device *udev;
1080
1081         if (WARN_ON(!ar))
1082                 return;
1083
1084         udev = ar->udev;
1085         wait_for_completion(&ar->fw_load_wait);
1086
1087         if (IS_INITIALIZED(ar)) {
1088                 carl9170_reboot(ar);
1089                 carl9170_usb_stop(ar);
1090         }
1091
1092         carl9170_usb_cancel_urbs(ar);
1093         carl9170_unregister(ar);
1094
1095         usb_set_intfdata(intf, NULL);
1096
1097         carl9170_release_firmware(ar);
1098         carl9170_free(ar);
1099         usb_put_dev(udev);
1100 }
1101
1102 #ifdef CONFIG_PM
1103 static int carl9170_usb_suspend(struct usb_interface *intf,
1104                                 pm_message_t message)
1105 {
1106         struct ar9170 *ar = usb_get_intfdata(intf);
1107
1108         if (!ar)
1109                 return -ENODEV;
1110
1111         carl9170_usb_cancel_urbs(ar);
1112
1113         return 0;
1114 }
1115
1116 static int carl9170_usb_resume(struct usb_interface *intf)
1117 {
1118         struct ar9170 *ar = usb_get_intfdata(intf);
1119         int err;
1120
1121         if (!ar)
1122                 return -ENODEV;
1123
1124         usb_unpoison_anchored_urbs(&ar->rx_anch);
1125         carl9170_set_state(ar, CARL9170_STOPPED);
1126
1127         /*
1128          * The USB documentation demands that [for suspend] all traffic
1129          * to and from the device has to stop. This would be fine, but
1130          * there's a catch: the device[usb phy] does not come back.
1131          *
1132          * Upon resume the firmware will "kill" itself and the
1133          * boot-code sorts out the magic voodoo.
1134          * Not very nice, but there's not much what could go wrong.
1135          */
1136         msleep(1100);
1137
1138         err = carl9170_usb_init_device(ar);
1139         if (err)
1140                 goto err_unrx;
1141
1142         return 0;
1143
1144 err_unrx:
1145         carl9170_usb_cancel_urbs(ar);
1146
1147         return err;
1148 }
1149 #endif /* CONFIG_PM */
1150
1151 static struct usb_driver carl9170_driver = {
1152         .name = KBUILD_MODNAME,
1153         .probe = carl9170_usb_probe,
1154         .disconnect = carl9170_usb_disconnect,
1155         .id_table = carl9170_usb_ids,
1156         .soft_unbind = 1,
1157 #ifdef CONFIG_PM
1158         .suspend = carl9170_usb_suspend,
1159         .resume = carl9170_usb_resume,
1160         .reset_resume = carl9170_usb_resume,
1161 #endif /* CONFIG_PM */
1162 };
1163
1164 module_usb_driver(carl9170_driver);