drivers/staging/csr/io.c

   1 /*
   2  * ---------------------------------------------------------------------------
   3  *  FILE:     io.c
   4  *
   5  *  PURPOSE:
   6  *      This file contains routines that the SDIO driver can call when a
   7  *      UniFi card is first inserted (or detected) and removed.
   8  *
   9  *      When used with sdioemb, the udev scripts (at least on Ubuntu) don't
  10  *      recognise a UniFi being added to the system. This is because sdioemb
  11  *      does not register itself as a device_driver, it uses it's own code
  12  *      to handle insert and remove.
  13  *      To have Ubuntu recognise UniFi, edit /etc/udev/rules.d/85-ifupdown.rules
  14  *      to change this line:
  15  *          SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
  16  *      to these:
  17  *          #SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
  18  *          SUBSYSTEM=="net", GOTO="net_start"
  19  *
  20  *      Then you can add a stanza to /etc/network/interfaces like this:
  21  *          auto eth1
  22  *          iface eth1 inet dhcp
  23  *          wpa-conf /etc/wpa_supplicant.conf
  24  *      This will then automatically associate when a car dis inserted.
  25  *
  26  * Copyright (C) 2006-2009 by Cambridge Silicon Radio Ltd.
  27  *
  28  * Refer to LICENSE.txt included with this source code for details on
  29  * the license terms.
  30  *
  31  * ---------------------------------------------------------------------------
  32  */
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35
  36 #include "csr_wifi_hip_unifi.h"
  37 #include "csr_wifi_hip_unifiversion.h"
  38 #include "csr_wifi_hip_unifi_udi.h"   /* for unifi_print_status() */
  39 #include "unifiio.h"
  40 #include "unifi_priv.h"
  41
  42 /*
  43  * Array of pointers to context structs for unifi devices that are present.
  44  * The index in the array corresponds to the wlan interface number
  45  * (if "wlan*" is used). If "eth*" is used, the eth* numbers are allocated
  46  * after any Ethernet cards.
  47  *
  48  * The Arasan PCI-SDIO controller card supported by this driver has 2 slots,
  49  * hence a max of 2 devices.
  50  */
  51 static unifi_priv_t *Unifi_instances[MAX_UNIFI_DEVS];
  52
  53 /* Array of pointers to netdev objects used by the UniFi driver, as there
  54  * are now many per instance. This is used to determine which netdev events
  55  * are for UniFi as opposed to other net interfaces.
  56  */
  57 static netInterface_priv_t *Unifi_netdev_instances[MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES];
  58
  59 /*
  60  * Array to hold the status of each unifi device in each slot.
  61  * We only process an insert event when In_use[] for the slot is
  62  * UNIFI_DEV_NOT_IN_USE. Otherwise, it means that the slot is in use or
  63  * we are in the middle of a cleanup (the action on unplug).
  64  */
  65 #define UNIFI_DEV_NOT_IN_USE    0
  66 #define UNIFI_DEV_IN_USE        1
  67 #define UNIFI_DEV_CLEANUP       2
  68 static int In_use[MAX_UNIFI_DEVS];
  69 /*
  70  * Mutex to prevent UDI clients to open the character device before the priv
  71  * is created and initialised.
  72  */
  73 DEFINE_SEMAPHORE(Unifi_instance_mutex);
  74 /*
  75  * When the device is removed, unregister waits on Unifi_cleanup_wq
  76  * until all the UDI clients release the character device.
  77  */
  78 DECLARE_WAIT_QUEUE_HEAD(Unifi_cleanup_wq);
  79
  80 #ifdef CONFIG_PROC_FS
  81 /*
  82  * seq_file wrappers for procfile show routines.
  83  */
  84 static int uf_proc_show(struct seq_file *m, void *v);
  85
  86 #define UNIFI_DEBUG_TXT_BUFFER (8 * 1024)
  87
  88 static int uf_proc_open(struct inode *inode, struct file *file)
  89 {
  90         return single_open_size(file, uf_proc_show, PDE_DATA(inode),
  91                                 UNIFI_DEBUG_TXT_BUFFER);
  92 }
  93
  94 static const struct file_operations uf_proc_fops = {
  95         .open           = uf_proc_open,
  96         .read           = seq_read,
  97         .llseek         = seq_lseek,
  98         .release        = single_release,
  99 };
 100
 101 #endif /* CONFIG_PROC_FS */
 102
 103 #ifdef CSR_WIFI_RX_PATH_SPLIT
 104
 105 static CsrResult signal_buffer_init(unifi_priv_t * priv, int size)
 106 {
 107     int i;
 108
 109     priv->rxSignalBuffer.writePointer =
 110     priv->rxSignalBuffer.readPointer = 0;
 111     priv->rxSignalBuffer.size = size;
 112     /* Allocating Memory for Signal primitive pointer */
 113     for(i=0; i<size; i++)
 114     {
 115          priv->rxSignalBuffer.rx_buff[i].sig_len=0;
 116          priv->rxSignalBuffer.rx_buff[i].bufptr = kmalloc(UNIFI_PACKED_SIGBUF_SIZE, GFP_KERNEL);
 117          if (priv->rxSignalBuffer.rx_buff[i].bufptr == NULL)
 118          {
 119              int j;
 120              unifi_error(priv, "signal_buffer_init:Failed to Allocate shared memory for T-H signals \n");
 121              for(j=0;j<i;j++)
 122              {
 123                  priv->rxSignalBuffer.rx_buff[j].sig_len=0;
 124                  kfree(priv->rxSignalBuffer.rx_buff[j].bufptr);
 125                  priv->rxSignalBuffer.rx_buff[j].bufptr = NULL;
 126              }
 127              return -1;
 128          }
 129     }
 130     return 0;
 131 }
 132
 133
 134 static void signal_buffer_free(unifi_priv_t * priv, int size)
 135 {
 136     int i;
 137
 138     for(i=0; i<size; i++)
 139     {
 140          priv->rxSignalBuffer.rx_buff[i].sig_len=0;
 141          kfree(priv->rxSignalBuffer.rx_buff[i].bufptr);
 142          priv->rxSignalBuffer.rx_buff[i].bufptr = NULL;
 143     }
 144 }
 145 #endif
 146 /*
 147  * ---------------------------------------------------------------------------
 148  *  uf_register_netdev
 149  *
 150  *      Registers the network interface, installes the qdisc,
 151  *      and registers the inet handler.
 152  *      In the porting exercise, register the driver to the network
 153  *      stack if necessary.
 154  *
 155  *  Arguments:
 156  *      priv          Pointer to driver context.
 157  *
 158  *  Returns:
 159  *      O on success, non-zero otherwise.
 160  *
 161  *  Notes:
 162  *      We will only unregister when the card is ejected, so we must
 163  *      only do it once.
 164  * ---------------------------------------------------------------------------
 165  */
 166 int
 167 uf_register_netdev(unifi_priv_t *priv, int interfaceTag)
 168 {
 169     int r;
 170     netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];
 171
 172     if (interfaceTag >= CSR_WIFI_NUM_INTERFACES) {
 173         unifi_error(priv, "uf_register_netdev bad interfaceTag\n");
 174         return -EINVAL;
 175     }
 176
 177     /*
 178      * Allocates a device number and registers device with the network
 179      * stack.
 180      */
 181     unifi_trace(priv, UDBG5, "uf_register_netdev: netdev %d - 0x%p\n",
 182             interfaceTag, priv->netdev[interfaceTag]);
 183     r = register_netdev(priv->netdev[interfaceTag]);
 184     if (r) {
 185         unifi_error(priv, "Failed to register net device\n");
 186         return -EINVAL;
 187     }
 188
 189     /* The device is registed */
 190     interfacePriv->netdev_registered = 1;
 191
 192 #ifdef CSR_SUPPORT_SME
 193     /*
 194      * Register the inet handler; it notifies us for changes in the IP address.
 195      */
 196     uf_register_inet_notifier();
 197 #endif /* CSR_SUPPORT_SME */
 198
 199     unifi_notice(priv, "unifi%d is %s\n",
 200             priv->instance, priv->netdev[interfaceTag]->name);
 201
 202     return 0;
 203 } /* uf_register_netdev */
 204
 205
 206 /*
 207  * ---------------------------------------------------------------------------
 208  *  uf_unregister_netdev
 209  *
 210  *      Unregisters the network interface and the inet handler.
 211  *
 212  *  Arguments:
 213  *      priv          Pointer to driver context.
 214  *
 215  *  Returns:
 216  *      None.
 217  *
 218  * ---------------------------------------------------------------------------
 219  */
 220 void
 221 uf_unregister_netdev(unifi_priv_t *priv)
 222 {
 223     int i=0;
 224
 225 #ifdef CSR_SUPPORT_SME
 226     /* Unregister the inet handler... */
 227     uf_unregister_inet_notifier();
 228 #endif /* CSR_SUPPORT_SME */
 229
 230     for (i=0; i<CSR_WIFI_NUM_INTERFACES; i++) {
 231         netInterface_priv_t *interfacePriv = priv->interfacePriv[i];
 232         if (interfacePriv->netdev_registered) {
 233             unifi_trace(priv, UDBG5,
 234                     "uf_unregister_netdev: netdev %d - 0x%p\n",
 235                     i, priv->netdev[i]);
 236
 237             /* ... and the netdev */
 238             unregister_netdev(priv->netdev[i]);
 239             interfacePriv->netdev_registered = 0;
 240         }
 241
 242         interfacePriv->interfaceMode = 0;
 243
 244         /* Enable all queues by default */
 245         interfacePriv->queueEnabled[0] = 1;
 246         interfacePriv->queueEnabled[1] = 1;
 247         interfacePriv->queueEnabled[2] = 1;
 248         interfacePriv->queueEnabled[3] = 1;
 249     }
 250
 251     priv->totalInterfaceCount = 0;
 252 } /* uf_unregister_netdev() */
 253
 254
 255 /*
 256  * ---------------------------------------------------------------------------
 257  *  register_unifi_sdio
 258  *
 259  *      This function is called from the Probe (or equivalent) method of
 260  *      the SDIO driver when a UniFi card is detected.
 261  *      We allocate the Linux net_device struct, initialise the HIP core
 262  *      lib, create the char device nodes and start the userspace helper
 263  *      to initialise the device.
 264  *
 265  *  Arguments:
 266  *      sdio_dev        Pointer to SDIO context handle to use for all
 267  *                      SDIO ops.
 268  *      bus_id          A small number indicating the SDIO card position on the
 269  *                      bus. Typically this is the slot number, e.g. 0, 1 etc.
 270  *                      Valid values are 0 to MAX_UNIFI_DEVS-1.
 271  *      dev             Pointer to kernel device manager struct.
 272  *
 273  *  Returns:
 274  *      Pointer to the unifi instance, or NULL on error.
 275  * ---------------------------------------------------------------------------
 276  */
 277 static unifi_priv_t *
 278 register_unifi_sdio(CsrSdioFunction *sdio_dev, int bus_id, struct device *dev)
 279 {
 280     unifi_priv_t *priv = NULL;
 281     int r = -1;
 282     CsrResult csrResult;
 283
 284     if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
 285         unifi_error(priv, "register_unifi_sdio: invalid device %d\n",
 286                 bus_id);
 287         return NULL;
 288     }
 289
 290     down(&Unifi_instance_mutex);
 291
 292     if (In_use[bus_id] != UNIFI_DEV_NOT_IN_USE) {
 293         unifi_error(priv, "register_unifi_sdio: device %d is already in use\n",
 294                 bus_id);
 295         goto failed0;
 296     }
 297
 298
 299     /* Allocate device private and net_device structs */
 300     priv = uf_alloc_netdevice(sdio_dev, bus_id);
 301     if (priv == NULL) {
 302         unifi_error(priv, "Failed to allocate driver private\n");
 303         goto failed0;
 304     }
 305
 306     priv->unifi_device = dev;
 307
 308     SET_NETDEV_DEV(priv->netdev[0], dev);
 309
 310     /* We are not ready to send data yet. */
 311     netif_carrier_off(priv->netdev[0]);
 312
 313     /* Allocate driver context. */
 314     priv->card = unifi_alloc_card(priv->sdio, priv);
 315     if (priv->card == NULL) {
 316         unifi_error(priv, "Failed to allocate UniFi driver card struct.\n");
 317         goto failed1;
 318     }
 319
 320     if (Unifi_instances[bus_id]) {
 321         unifi_error(priv, "Internal error: instance for slot %d is already taken\n",
 322                 bus_id);
 323     }
 324     Unifi_instances[bus_id] = priv;
 325     In_use[bus_id] = UNIFI_DEV_IN_USE;
 326
 327     /* Save the netdev_priv for use by the netdev event callback mechanism */
 328     Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES] = netdev_priv(priv->netdev[0]);
 329
 330     /* Initialise the mini-coredump capture buffers */
 331     csrResult = unifi_coredump_init(priv->card, (u16)coredump_max);
 332     if (csrResult != CSR_RESULT_SUCCESS) {
 333         unifi_error(priv, "Couldn't allocate mini-coredump buffers\n");
 334     }
 335
 336     /* Create the character device nodes */
 337     r = uf_create_device_nodes(priv, bus_id);
 338     if (r) {
 339         goto failed1;
 340     }
 341
 342     /*
 343      * We use the slot number as unifi device index.
 344      */
 345     scnprintf(priv->proc_entry_name, 64, "driver/unifi%d", priv->instance);
 346     /*
 347      * The following complex casting is in place in order to eliminate 64-bit compilation warning
 348      * "cast to/from pointer from/to integer of different size"
 349      */
 350     if (!proc_create_data(priv->proc_entry_name, 0, NULL,
 351                           &uf_proc_fops, (void *)(long)priv->instance))
 352     {
 353         unifi_error(priv, "unifi: can't create /proc/driver/unifi\n");
 354     }
 355
 356     /* Allocate the net_device for interfaces other than 0. */
 357     {
 358         int i;
 359         priv->totalInterfaceCount =0;
 360
 361         for(i=1;i<CSR_WIFI_NUM_INTERFACES;i++)
 362         {
 363             if( !uf_alloc_netdevice_for_other_interfaces(priv, i) )
 364             {
 365                 /* error occured while allocating the net_device for interface[i]. The net_device are
 366                  * allocated for the interfaces with id<i. Dont worry, all the allocated net_device will
 367                  * be releasing chen the control goes to the label failed0.
 368                  */
 369                 unifi_error(priv, "Failed to allocate driver private for interface[%d]\n", i);
 370                 goto failed0;
 371             }
 372             else
 373             {
 374                 SET_NETDEV_DEV(priv->netdev[i], dev);
 375
 376                 /* We are not ready to send data yet. */
 377                 netif_carrier_off(priv->netdev[i]);
 378
 379                 /* Save the netdev_priv for use by the netdev event callback mechanism */
 380                 Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES + i] = netdev_priv(priv->netdev[i]);
 381             }
 382         }
 383
 384         for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++)
 385         {
 386             netInterface_priv_t *interfacePriv = priv->interfacePriv[i];
 387             interfacePriv->netdev_registered=0;
 388         }
 389     }
 390
 391 #ifdef CSR_WIFI_RX_PATH_SPLIT
 392     if (signal_buffer_init(priv, CSR_WIFI_RX_SIGNAL_BUFFER_SIZE))
 393     {
 394         unifi_error(priv, "Failed to allocate shared memory for T-H signals\n");
 395         goto failed2;
 396     }
 397     priv->rx_workqueue = create_singlethread_workqueue("rx_workq");
 398     if (priv->rx_workqueue == NULL) {
 399         unifi_error(priv, "create_singlethread_workqueue failed \n");
 400         goto failed3;
 401     }
 402     INIT_WORK(&priv->rx_work_struct, rx_wq_handler);
 403 #endif
 404
 405 #ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
 406     if (log_hip_signals)
 407     {
 408         uf_register_hip_offline_debug(priv);
 409     }
 410 #endif
 411
 412     /* Initialise the SME related threads and parameters */
 413     r = uf_sme_init(priv);
 414     if (r) {
 415         unifi_error(priv, "SME initialisation failed.\n");
 416         goto failed4;
 417     }
 418
 419     /*
 420      * Run the userspace helper program (unififw) to perform
 421      * the device initialisation.
 422      */
 423     unifi_trace(priv, UDBG1, "run UniFi helper app...\n");
 424     r = uf_run_unifihelper(priv);
 425     if (r) {
 426         unifi_notice(priv, "unable to run UniFi helper app\n");
 427         /* Not a fatal error. */
 428     }
 429
 430     up(&Unifi_instance_mutex);
 431
 432     return priv;
 433
 434 failed4:
 435 #ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
 436 if (log_hip_signals)
 437 {
 438     uf_unregister_hip_offline_debug(priv);
 439 }
 440 #endif
 441 #ifdef CSR_WIFI_RX_PATH_SPLIT
 442     flush_workqueue(priv->rx_workqueue);
 443     destroy_workqueue(priv->rx_workqueue);
 444 failed3:
 445     signal_buffer_free(priv, CSR_WIFI_RX_SIGNAL_BUFFER_SIZE);
 446 failed2:
 447 #endif
 448     /* Remove the device nodes */
 449     uf_destroy_device_nodes(priv);
 450 failed1:
 451     /* Deregister priv->netdev_client */
 452     ul_deregister_client(priv->netdev_client);
 453
 454 failed0:
 455     if (priv && priv->card) {
 456         unifi_coredump_free(priv->card);
 457         unifi_free_card(priv->card);
 458     }
 459     if (priv) {
 460         uf_free_netdevice(priv);
 461     }
 462
 463     up(&Unifi_instance_mutex);
 464
 465     return NULL;
 466 } /* register_unifi_sdio() */
 467
 468
 469 /*
 470  * ---------------------------------------------------------------------------
 471  *  ask_unifi_sdio_cleanup
 472  *
 473  *      We can not free our private context, until all the char device
 474  *      clients have closed the file handles. unregister_unifi_sdio() which
 475  *      is called when a card is removed, waits on Unifi_cleanup_wq until
 476  *      the reference count becomes zero. It is time to wake it up now.
 477  *
 478  *  Arguments:
 479  *      priv          Pointer to driver context.
 480  *
 481  *  Returns:
 482  *      None.
 483  * ---------------------------------------------------------------------------
 484  */
 485 static void
 486 ask_unifi_sdio_cleanup(unifi_priv_t *priv)
 487 {
 488
 489     /*
 490      * Now clear the flag that says the old instance is in use.
 491      * This is used to prevent a new instance being started before old
 492      * one has finshed closing down, for example if bounce makes the card
 493      * appear to be ejected and re-inserted quickly.
 494      */
 495     In_use[priv->instance] = UNIFI_DEV_CLEANUP;
 496
 497     unifi_trace(NULL, UDBG5, "ask_unifi_sdio_cleanup: wake up cleanup workqueue.\n");
 498     wake_up(&Unifi_cleanup_wq);
 499
 500 } /* ask_unifi_sdio_cleanup() */
 501
 502
 503 /*
 504  * ---------------------------------------------------------------------------
 505  *  cleanup_unifi_sdio
 506  *
 507  *      Release any resources owned by a unifi instance.
 508  *
 509  *  Arguments:
 510  *      priv          Pointer to the instance to free.
 511  *
 512  *  Returns:
 513  *      None.
 514  * ---------------------------------------------------------------------------
 515  */
 516 static void
 517 cleanup_unifi_sdio(unifi_priv_t *priv)
 518 {
 519     int priv_instance;
 520     int i;
 521     static const CsrWifiMacAddress broadcast_address = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}};
 522
 523     /* Remove the device nodes */
 524     uf_destroy_device_nodes(priv);
 525
 526     /* Mark this device as gone away by NULLing the entry in Unifi_instances */
 527     Unifi_instances[priv->instance] = NULL;
 528
 529     unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: remove_proc_entry\n");
 530     /*
 531      * Free the children of priv before unifi_free_netdevice() frees
 532      * the priv struct
 533      */
 534     remove_proc_entry(priv->proc_entry_name, 0);
 535
 536
 537     /* Unregister netdev as a client. */
 538     if (priv->netdev_client) {
 539         unifi_trace(priv, UDBG2, "Netdev client (id:%d s:0x%X) is unregistered\n",
 540                 priv->netdev_client->client_id, priv->netdev_client->sender_id);
 541         ul_deregister_client(priv->netdev_client);
 542     }
 543
 544     /* Destroy the SME related threads and parameters */
 545     uf_sme_deinit(priv);
 546
 547 #ifdef CSR_SME_USERSPACE
 548     priv->smepriv = NULL;
 549 #endif
 550
 551 #ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
 552     if (log_hip_signals)
 553     {
 554         uf_unregister_hip_offline_debug(priv);
 555     }
 556 #endif
 557
 558     /* Free any packets left in the Rx queues */
 559     for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++)
 560     {
 561         uf_free_pending_rx_packets(priv, UF_UNCONTROLLED_PORT_Q, broadcast_address, i);
 562         uf_free_pending_rx_packets(priv, UF_CONTROLLED_PORT_Q, broadcast_address, i);
 563     }
 564     /*
 565      * We need to free the resources held by the core, which include tx skbs,
 566      * otherwise we can not call unregister_netdev().
 567      */
 568     if (priv->card) {
 569         unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: free card\n");
 570         unifi_coredump_free(priv->card);
 571         unifi_free_card(priv->card);
 572         priv->card = NULL;
 573     }
 574
 575     /*
 576      * Unregister the network device.
 577      * We can not unregister the netdev before we release
 578      * all pending packets in the core.
 579      */
 580     uf_unregister_netdev(priv);
 581     priv->totalInterfaceCount = 0;
 582
 583     /* Clear the table of registered netdev_priv's */
 584     for (i = 0; i < CSR_WIFI_NUM_INTERFACES; i++) {
 585         Unifi_netdev_instances[priv->instance * CSR_WIFI_NUM_INTERFACES + i] = NULL;
 586     }
 587
 588     unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: uf_free_netdevice\n");
 589     /*
 590      * When uf_free_netdevice() returns, the priv is invalid
 591      * so we need to remember the instance to clear the global flag later.
 592      */
 593     priv_instance = priv->instance;
 594
 595 #ifdef CSR_WIFI_RX_PATH_SPLIT
 596     flush_workqueue(priv->rx_workqueue);
 597     destroy_workqueue(priv->rx_workqueue);
 598     signal_buffer_free(priv, CSR_WIFI_RX_SIGNAL_BUFFER_SIZE);
 599 #endif
 600
 601     /* Priv is freed as part of the net_device */
 602     uf_free_netdevice(priv);
 603
 604     /*
 605      * Now clear the flag that says the old instance is in use.
 606      * This is used to prevent a new instance being started before old
 607      * one has finshed closing down, for example if bounce makes the card
 608      * appear to be ejected and re-inserted quickly.
 609      */
 610     In_use[priv_instance] = UNIFI_DEV_NOT_IN_USE;
 611
 612     unifi_trace(NULL, UDBG5, "cleanup_unifi_sdio: DONE.\n");
 613
 614 } /* cleanup_unifi_sdio() */
 615
 616
 617 /*
 618  * ---------------------------------------------------------------------------
 619  *  unregister_unifi_sdio
 620  *
 621  *      Call from SDIO driver when it detects that UniFi has been removed.
 622  *
 623  *  Arguments:
 624  *      bus_id          Number of the card that was ejected.
 625  *
 626  *  Returns:
 627  *      None.
 628  * ---------------------------------------------------------------------------
 629  */
 630 static void
 631 unregister_unifi_sdio(int bus_id)
 632 {
 633     unifi_priv_t *priv;
 634     int interfaceTag=0;
 635     u8 reason = CONFIG_IND_EXIT;
 636
 637     if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
 638         unifi_error(NULL, "unregister_unifi_sdio: invalid device %d\n",
 639                 bus_id);
 640         return;
 641     }
 642
 643     priv = Unifi_instances[bus_id];
 644     if (priv == NULL) {
 645         unifi_error(priv, "unregister_unifi_sdio: device %d is not registered\n",
 646                 bus_id);
 647         return;
 648     }
 649
 650     /* Stop the network traffic before freeing the core. */
 651     for(interfaceTag=0;interfaceTag<priv->totalInterfaceCount;interfaceTag++)
 652     {
 653         netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];
 654         if(interfacePriv->netdev_registered)
 655         {
 656             netif_carrier_off(priv->netdev[interfaceTag]);
 657             netif_tx_stop_all_queues(priv->netdev[interfaceTag]);
 658         }
 659     }
 660
 661 #ifdef CSR_NATIVE_LINUX
 662     /*
 663      * If the unifi thread was started, signal it to stop.  This
 664      * should cause any userspace processes with open unifi device to
 665      * close them.
 666      */
 667     uf_stop_thread(priv, &priv->bh_thread);
 668
 669     /* Unregister the interrupt handler */
 670     if (csr_sdio_linux_remove_irq(priv->sdio)) {
 671         unifi_notice(priv,
 672                 "csr_sdio_linux_remove_irq failed to talk to card.\n");
 673     }
 674
 675     /* Ensure no MLME functions are waiting on a the mlme_event semaphore. */
 676     uf_abort_mlme(priv);
 677 #endif /* CSR_NATIVE_LINUX */
 678
 679     ul_log_config_ind(priv, &reason, sizeof(u8));
 680
 681     /* Deregister the UDI hook from the core. */
 682     unifi_remove_udi_hook(priv->card, logging_handler);
 683
 684     uf_put_instance(bus_id);
 685
 686     /*
 687      * Wait until the device is cleaned up. i.e., when all userspace
 688      * processes have closed any open unifi devices.
 689      */
 690     wait_event(Unifi_cleanup_wq, In_use[bus_id] == UNIFI_DEV_CLEANUP);
 691     unifi_trace(NULL, UDBG5, "Received clean up event\n");
 692
 693     /* Now we can free the private context and the char device nodes */
 694     cleanup_unifi_sdio(priv);
 695
 696 } /* unregister_unifi_sdio() */
 697
 698
 699 /*
 700  * ---------------------------------------------------------------------------
 701  *  uf_find_instance
 702  *
 703  *      Find the context structure for a given UniFi device instance.
 704  *
 705  *  Arguments:
 706  *      inst            The instance number to look for.
 707  *
 708  *  Returns:
 709  *      None.
 710  * ---------------------------------------------------------------------------
 711  */
 712 unifi_priv_t *
 713 uf_find_instance(int inst)
 714 {
 715     if ((inst < 0) || (inst >= MAX_UNIFI_DEVS)) {
 716         return NULL;
 717     }
 718     return Unifi_instances[inst];
 719 } /* uf_find_instance() */
 720
 721
 722 /*
 723  * ---------------------------------------------------------------------------
 724  *  uf_find_priv
 725  *
 726  *      Find the device instance for a given context structure.
 727  *
 728  *  Arguments:
 729  *      priv            The context structure pointer to look for.
 730  *
 731  *  Returns:
 732  *      index of instance, -1 otherwise.
 733  * ---------------------------------------------------------------------------
 734  */
 735 int
 736 uf_find_priv(unifi_priv_t *priv)
 737 {
 738     int inst;
 739
 740     if (!priv) {
 741         return -1;
 742     }
 743
 744     for (inst = 0; inst < MAX_UNIFI_DEVS; inst++) {
 745         if (Unifi_instances[inst] == priv) {
 746             return inst;
 747         }
 748     }
 749
 750     return -1;
 751 } /* uf_find_priv() */
 752
 753 /*
 754  * ---------------------------------------------------------------------------
 755  *  uf_find_netdev_priv
 756  *
 757  *      Find the device instance for a given netdev context structure.
 758  *
 759  *  Arguments:
 760  *      priv            The context structure pointer to look for.
 761  *
 762  *  Returns:
 763  *      index of instance, -1 otherwise.
 764  * ---------------------------------------------------------------------------
 765  */
 766 int
 767 uf_find_netdev_priv(netInterface_priv_t *priv)
 768 {
 769     int inst;
 770
 771     if (!priv) {
 772         return -1;
 773     }
 774
 775     for (inst = 0; inst < MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES; inst++) {
 776         if (Unifi_netdev_instances[inst] == priv) {
 777             return inst;
 778         }
 779     }
 780
 781     return -1;
 782 } /* uf_find_netdev_priv() */
 783
 784 /*
 785  * ---------------------------------------------------------------------------
 786  *  uf_get_instance
 787  *
 788  *      Find the context structure for a given UniFi device instance
 789  *      and increment the reference count.
 790  *
 791  *  Arguments:
 792  *      inst            The instance number to look for.
 793  *
 794  *  Returns:
 795  *      Pointer to the instance or NULL if no instance exists.
 796  * ---------------------------------------------------------------------------
 797  */
 798 unifi_priv_t *
 799 uf_get_instance(int inst)
 800 {
 801     unifi_priv_t *priv;
 802
 803     down(&Unifi_instance_mutex);
 804
 805     priv = uf_find_instance(inst);
 806     if (priv) {
 807         priv->ref_count++;
 808     }
 809
 810     up(&Unifi_instance_mutex);
 811
 812     return priv;
 813 }
 814
 815 /*
 816  * ---------------------------------------------------------------------------
 817  *  uf_put_instance
 818  *
 819  *      Decrement the context reference count, freeing resources and
 820  *      shutting down the driver when the count reaches zero.
 821  *
 822  *  Arguments:
 823  *      inst            The instance number to look for.
 824  *
 825  *  Returns:
 826  *      Pointer to the instance or NULL if no instance exists.
 827  * ---------------------------------------------------------------------------
 828  */
 829 void
 830 uf_put_instance(int inst)
 831 {
 832     unifi_priv_t *priv;
 833
 834     down(&Unifi_instance_mutex);
 835
 836     priv = uf_find_instance(inst);
 837     if (priv) {
 838         priv->ref_count--;
 839         if (priv->ref_count == 0) {
 840             ask_unifi_sdio_cleanup(priv);
 841         }
 842     }
 843
 844     up(&Unifi_instance_mutex);
 845 }
 846
 847
 848 /*
 849  * ---------------------------------------------------------------------------
 850  *  uf_proc_show
 851  *
 852  *      Read method for driver node in /proc/driver/unifi0
 853  *
 854  *  Arguments:
 855  *      page
 856  *      start
 857  *      offset
 858  *      count
 859  *      eof
 860  *      data
 861  *
 862  *  Returns:
 863  *      None.
 864  * ---------------------------------------------------------------------------
 865  */
 866 #ifdef CONFIG_PROC_FS
 867 static int uf_proc_show(struct seq_file *m, void *v)
 868 {
 869         unifi_priv_t *priv;
 870         int i;
 871
 872         /*
 873          * The following complex casting is in place in order to eliminate
 874          * 64-bit compilation warning "cast to/from pointer from/to integer of
 875          * different size"
 876          */
 877         priv = uf_find_instance((long)m->private);
 878         if (!priv)
 879                 return 0;
 880
 881         seq_printf(m, "UniFi SDIO Driver: %s %s %s\n",
 882                    CSR_WIFI_VERSION, __DATE__, __TIME__);
 883 #ifdef CSR_SME_USERSPACE
 884         seq_puts(m, "SME: CSR userspace ");
 885 #ifdef CSR_SUPPORT_WEXT
 886         seq_puts(m, "with WEXT support\n");
 887 #else
 888         seq_putc(m, '\n');
 889 #endif /* CSR_SUPPORT_WEXT */
 890 #endif /* CSR_SME_USERSPACE */
 891 #ifdef CSR_NATIVE_LINUX
 892         seq_puts(m, "SME: native\n");
 893 #endif
 894
 895 #ifdef CSR_SUPPORT_SME
 896         seq_printf(m, "Firmware (ROM) build:%u, Patch:%u\n",
 897                    priv->card_info.fw_build,
 898                    priv->sme_versions.firmwarePatch);
 899 #endif
 900
 901         unifi_print_status(priv->card, m);
 902
 903         seq_printf(m, "Last dbg str: %s\n", priv->last_debug_string);
 904
 905         seq_puts(m, "Last dbg16:");
 906         for (i = 0; i < 8; i++)
 907                 seq_printf(m, " %04X", priv->last_debug_word16[i]);
 908         seq_putc(m, '\n');
 909         seq_puts(m, "           ");
 910         for (; i < 16; i++)
 911                 seq_printf(m, " %04X", priv->last_debug_word16[i]);
 912         seq_putc(m, '\n');
 913         return 0;
 914 }
 915 #endif
 916
 917
 918
 919
 920 static void
 921 uf_lx_suspend(CsrSdioFunction *sdio_ctx)
 922 {
 923     unifi_priv_t *priv = sdio_ctx->driverData;
 924     unifi_suspend(priv);
 925
 926     CsrSdioSuspendAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
 927 }
 928
 929 static void
 930 uf_lx_resume(CsrSdioFunction *sdio_ctx)
 931 {
 932     unifi_priv_t *priv = sdio_ctx->driverData;
 933     unifi_resume(priv);
 934
 935     CsrSdioResumeAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
 936 }
 937
 938 static int active_slot = MAX_UNIFI_DEVS;
 939 static struct device *os_devices[MAX_UNIFI_DEVS];
 940
 941 void
 942 uf_add_os_device(int bus_id, struct device *os_device)
 943 {
 944     if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
 945         unifi_error(NULL, "uf_add_os_device: invalid device %d\n",
 946                 bus_id);
 947         return;
 948     }
 949
 950     active_slot = bus_id;
 951     os_devices[bus_id] = os_device;
 952 } /* uf_add_os_device() */
 953
 954 void
 955 uf_remove_os_device(int bus_id)
 956 {
 957     if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
 958         unifi_error(NULL, "uf_remove_os_device: invalid device %d\n",
 959                 bus_id);
 960         return;
 961     }
 962
 963     active_slot = bus_id;
 964     os_devices[bus_id] = NULL;
 965 } /* uf_remove_os_device() */
 966
 967 static void
 968 uf_sdio_inserted(CsrSdioFunction *sdio_ctx)
 969 {
 970         unifi_priv_t *priv;
 971
 972         unifi_trace(NULL, UDBG5, "uf_sdio_inserted(0x%p), slot_id=%d, dev=%p\n",
 973                       sdio_ctx, active_slot, os_devices[active_slot]);
 974
 975         priv = register_unifi_sdio(sdio_ctx, active_slot, os_devices[active_slot]);
 976         if (priv == NULL) {
 977                 CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_FAILURE);
 978                 return;
 979         }
 980
 981         sdio_ctx->driverData = priv;
 982
 983         CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
 984 } /* uf_sdio_inserted() */
 985
 986
 987 static void
 988 uf_sdio_removed(CsrSdioFunction *sdio_ctx)
 989 {
 990         unregister_unifi_sdio(active_slot);
 991         CsrSdioRemovedAcknowledge(sdio_ctx);
 992 } /* uf_sdio_removed() */
 993
 994
 995 static void
 996 uf_sdio_dsr_handler(CsrSdioFunction *sdio_ctx)
 997 {
 998         unifi_priv_t *priv = sdio_ctx->driverData;
 999
1000         unifi_sdio_interrupt_handler(priv->card);
1001 } /* uf_sdio_dsr_handler() */
1002
1003 /*
1004  * ---------------------------------------------------------------------------
1005  *  uf_sdio_int_handler
1006  *
1007  *      Interrupt callback function for SDIO interrupts.
1008  *      This is called in kernel context (i.e. not interrupt context).
1009  *      We retrieve the unifi context pointer and call the main UniFi
1010  *      interrupt handler.
1011  *
1012  *  Arguments:
1013  *      fdev      SDIO context pointer
1014  *
1015  *  Returns:
1016  *      None.
1017  * ---------------------------------------------------------------------------
1018  */
1019 static CsrSdioInterruptDsrCallback
1020 uf_sdio_int_handler(CsrSdioFunction *sdio_ctx)
1021 {
1022         return uf_sdio_dsr_handler;
1023 } /* uf_sdio_int_handler() */
1024
1025
1026
1027
1028 static CsrSdioFunctionId unifi_ids[] =
1029 {
1030         {
1031                 .manfId = SDIO_MANF_ID_CSR,
1032                 .cardId = SDIO_CARD_ID_UNIFI_3,
1033                 .sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_3,
1034                 .sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE,
1035         },
1036         {
1037                 .manfId = SDIO_MANF_ID_CSR,
1038                 .cardId = SDIO_CARD_ID_UNIFI_4,
1039                 .sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_4,
1040                 .sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE,
1041         }
1042 };
1043
1044
1045 /*
1046  * Structure to register with the glue layer.
1047  */
1048 static CsrSdioFunctionDriver unifi_sdioFunction_drv =
1049 {
1050         .inserted = uf_sdio_inserted,
1051         .removed = uf_sdio_removed,
1052         .intr = uf_sdio_int_handler,
1053         .suspend = uf_lx_suspend,
1054         .resume = uf_lx_resume,
1055
1056         .ids = unifi_ids,
1057         .idsCount = sizeof(unifi_ids) / sizeof(unifi_ids[0])
1058 };
1059
1060
1061 /*
1062  * ---------------------------------------------------------------------------
1063  *  uf_sdio_load
1064  *  uf_sdio_unload
1065  *
1066  *      These functions are called from the main module load and unload
1067  *      functions. They perform the appropriate operations for the monolithic
1068  *      driver.
1069  *
1070  *  Arguments:
1071  *      None.
1072  *
1073  *  Returns:
1074  *      None.
1075  * ---------------------------------------------------------------------------
1076  */
1077 int __init
1078 uf_sdio_load(void)
1079 {
1080         CsrResult csrResult;
1081
1082         csrResult = CsrSdioFunctionDriverRegister(&unifi_sdioFunction_drv);
1083         if (csrResult != CSR_RESULT_SUCCESS) {
1084                 unifi_error(NULL, "Failed to register UniFi SDIO driver: csrResult=%d\n", csrResult);
1085                 return -EIO;
1086         }
1087
1088         return 0;
1089 } /* uf_sdio_load() */
1090
1091
1092
1093 void __exit
1094 uf_sdio_unload(void)
1095 {
1096         CsrSdioFunctionDriverUnregister(&unifi_sdioFunction_drv);
1097 } /* uf_sdio_unload() */
1098