aboutsummaryrefslogtreecommitdiff
path: root/drivers/staging/csr/io.c
blob: af9c28f073b977585d09166fa574f29e687ed1cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
/*
 * ---------------------------------------------------------------------------
 *  FILE:     io.c
 *
 *  PURPOSE:
 *      This file contains routines that the SDIO driver can call when a
 *      UniFi card is first inserted (or detected) and removed.
 *
 *      When used with sdioemb, the udev scripts (at least on Ubuntu) don't
 *      recognise a UniFi being added to the system. This is because sdioemb
 *      does not register itself as a device_driver, it uses it's own code
 *      to handle insert and remove.
 *      To have Ubuntu recognise UniFi, edit /etc/udev/rules.d/85-ifupdown.rules
 *      to change this line:
 *          SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
 *      to these:
 *          #SUBSYSTEM=="net", DRIVERS=="?*", GOTO="net_start"
 *          SUBSYSTEM=="net", GOTO="net_start"
 *
 *      Then you can add a stanza to /etc/network/interfaces like this:
 *          auto eth1
 *          iface eth1 inet dhcp
 *          wpa-conf /etc/wpa_supplicant.conf
 *      This will then automatically associate when a car dis inserted.
 *
 * Copyright (C) 2006-2009 by Cambridge Silicon Radio Ltd.
 *
 * Refer to LICENSE.txt included with this source code for details on
 * the license terms.
 *
 * ---------------------------------------------------------------------------
 */
#include <linux/proc_fs.h>

#include "csr_wifi_hip_unifi.h"
#include "csr_wifi_hip_unifiversion.h"
#include "csr_wifi_hip_unifi_udi.h"   /* for unifi_print_status() */
#include "unifiio.h"
#include "unifi_priv.h"

/*
 * Array of pointers to context structs for unifi devices that are present.
 * The index in the array corresponds to the wlan interface number
 * (if "wlan*" is used). If "eth*" is used, the eth* numbers are allocated
 * after any Ethernet cards.
 *
 * The Arasan PCI-SDIO controller card supported by this driver has 2 slots,
 * hence a max of 2 devices.
 */
static unifi_priv_t *Unifi_instances[MAX_UNIFI_DEVS];

/* Array of pointers to netdev objects used by the UniFi driver, as there
 * are now many per instance. This is used to determine which netdev events
 * are for UniFi as opposed to other net interfaces.
 */
static netInterface_priv_t *Unifi_netdev_instances[MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES];

/*
 * Array to hold the status of each unifi device in each slot.
 * We only process an insert event when In_use[] for the slot is
 * UNIFI_DEV_NOT_IN_USE. Otherwise, it means that the slot is in use or
 * we are in the middle of a cleanup (the action on unplug).
 */
#define UNIFI_DEV_NOT_IN_USE    0
#define UNIFI_DEV_IN_USE        1
#define UNIFI_DEV_CLEANUP       2
static int In_use[MAX_UNIFI_DEVS];
/*
 * Mutex to prevent UDI clients to open the character device before the priv
 * is created and initialised.
 */
DEFINE_SEMAPHORE(Unifi_instance_mutex);
/*
 * When the device is removed, unregister waits on Unifi_cleanup_wq
 * until all the UDI clients release the character device.
 */
DECLARE_WAIT_QUEUE_HEAD(Unifi_cleanup_wq);


static int uf_read_proc(char *page, char **start, off_t offset, int count,
                        int *eof, void *data);

#ifdef CSR_WIFI_RX_PATH_SPLIT

static CsrResult signal_buffer_init(unifi_priv_t * priv, int size)
{
    int i;

    priv->rxSignalBuffer.writePointer =
    priv->rxSignalBuffer.readPointer = 0;
    priv->rxSignalBuffer.size = size;
    /* Allocating Memory for Signal primitive pointer */
    for(i=0; i<size; i++)
    {
         priv->rxSignalBuffer.rx_buff[i].sig_len=0;
         priv->rxSignalBuffer.rx_buff[i].bufptr = kmalloc(UNIFI_PACKED_SIGBUF_SIZE, GFP_KERNEL);
         if (priv->rxSignalBuffer.rx_buff[i].bufptr == NULL)
         {
             int j;
             unifi_error(priv,"signal_buffer_init:Failed to Allocate shared memory for T-H signals \n");
             for(j=0;j<i;j++)
             {
                 priv->rxSignalBuffer.rx_buff[j].sig_len=0;
                 kfree(priv->rxSignalBuffer.rx_buff[j].bufptr);
                 priv->rxSignalBuffer.rx_buff[j].bufptr = NULL;
             }
             return -1;
         }
    }
    return 0;
}


static void signal_buffer_free(unifi_priv_t * priv, int size)
{
    int i;

    for(i=0; i<size; i++)
    {
         priv->rxSignalBuffer.rx_buff[i].sig_len=0;
         kfree(priv->rxSignalBuffer.rx_buff[i].bufptr);
         priv->rxSignalBuffer.rx_buff[i].bufptr = NULL;
    }
}
#endif
/*
 * ---------------------------------------------------------------------------
 *  uf_register_netdev
 *
 *      Registers the network interface, installes the qdisc,
 *      and registers the inet handler.
 *      In the porting exercise, register the driver to the network
 *      stack if necessary.
 *
 *  Arguments:
 *      priv          Pointer to driver context.
 *
 *  Returns:
 *      O on success, non-zero otherwise.
 *
 *  Notes:
 *      We will only unregister when the card is ejected, so we must
 *      only do it once.
 * ---------------------------------------------------------------------------
 */
int
uf_register_netdev(unifi_priv_t *priv, int interfaceTag)
{
    int r;
    netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];

    if (interfaceTag >= CSR_WIFI_NUM_INTERFACES) {
        unifi_error(priv, "uf_register_netdev bad interfaceTag\n");
        return -EINVAL;
    }

    /*
     * Allocates a device number and registers device with the network
     * stack.
     */
    unifi_trace(priv, UDBG5, "uf_register_netdev: netdev %d - 0x%p\n",
            interfaceTag, priv->netdev[interfaceTag]);
    r = register_netdev(priv->netdev[interfaceTag]);
    if (r) {
        unifi_error(priv, "Failed to register net device\n");
        return -EINVAL;
    }

    /* The device is registed */
    interfacePriv->netdev_registered = 1;

#ifdef CSR_SUPPORT_SME
    /*
     * Register the inet handler; it notifies us for changes in the IP address.
     */
    uf_register_inet_notifier();
#endif /* CSR_SUPPORT_SME */

    unifi_notice(priv, "unifi%d is %s\n",
            priv->instance, priv->netdev[interfaceTag]->name);

    return 0;
} /* uf_register_netdev */


/*
 * ---------------------------------------------------------------------------
 *  uf_unregister_netdev
 *
 *      Unregisters the network interface and the inet handler.
 *
 *  Arguments:
 *      priv          Pointer to driver context.
 *
 *  Returns:
 *      None.
 *
 * ---------------------------------------------------------------------------
 */
void
uf_unregister_netdev(unifi_priv_t *priv)
{
    int i=0;

#ifdef CSR_SUPPORT_SME
    /* Unregister the inet handler... */
    uf_unregister_inet_notifier();
#endif /* CSR_SUPPORT_SME */

    for (i=0; i<CSR_WIFI_NUM_INTERFACES; i++) {
        netInterface_priv_t *interfacePriv = priv->interfacePriv[i];
        if (interfacePriv->netdev_registered) {
            unifi_trace(priv, UDBG5,
                    "uf_unregister_netdev: netdev %d - 0x%p\n",
                    i, priv->netdev[i]);

            /* ... and the netdev */
            unregister_netdev(priv->netdev[i]);
            interfacePriv->netdev_registered = 0;
        }

        interfacePriv->interfaceMode = 0;

        /* Enable all queues by default */
        interfacePriv->queueEnabled[0] = 1;
        interfacePriv->queueEnabled[1] = 1;
        interfacePriv->queueEnabled[2] = 1;
        interfacePriv->queueEnabled[3] = 1;
    }

    priv->totalInterfaceCount = 0;
} /* uf_unregister_netdev() */


/*
 * ---------------------------------------------------------------------------
 *  register_unifi_sdio
 *
 *      This function is called from the Probe (or equivalent) method of
 *      the SDIO driver when a UniFi card is detected.
 *      We allocate the Linux net_device struct, initialise the HIP core
 *      lib, create the char device nodes and start the userspace helper
 *      to initialise the device.
 *
 *  Arguments:
 *      sdio_dev        Pointer to SDIO context handle to use for all
 *                      SDIO ops.
 *      bus_id          A small number indicating the SDIO card position on the
 *                      bus. Typically this is the slot number, e.g. 0, 1 etc.
 *                      Valid values are 0 to MAX_UNIFI_DEVS-1.
 *      dev             Pointer to kernel device manager struct.
 *
 *  Returns:
 *      Pointer to the unifi instance, or NULL on error.
 * ---------------------------------------------------------------------------
 */
static unifi_priv_t *
register_unifi_sdio(CsrSdioFunction *sdio_dev, int bus_id, struct device *dev)
{
    unifi_priv_t *priv = NULL;
    int r = -1;
    CsrResult csrResult;

    if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
        unifi_error(priv, "register_unifi_sdio: invalid device %d\n",
                bus_id);
        return NULL;
    }

    down(&Unifi_instance_mutex);

    if (In_use[bus_id] != UNIFI_DEV_NOT_IN_USE) {
        unifi_error(priv, "register_unifi_sdio: device %d is already in use\n",
                bus_id);
        goto failed0;
    }


    /* Allocate device private and net_device structs */
    priv = uf_alloc_netdevice(sdio_dev, bus_id);
    if (priv == NULL) {
        unifi_error(priv, "Failed to allocate driver private\n");
        goto failed0;
    }

    priv->unifi_device = dev;

    SET_NETDEV_DEV(priv->netdev[0], dev);

    /* We are not ready to send data yet. */
    netif_carrier_off(priv->netdev[0]);

    /* Allocate driver context. */
    priv->card = unifi_alloc_card(priv->sdio, priv);
    if (priv->card == NULL) {
        unifi_error(priv, "Failed to allocate UniFi driver card struct.\n");
        goto failed1;
    }

    if (Unifi_instances[bus_id]) {
        unifi_error(priv, "Internal error: instance for slot %d is already taken\n",
                bus_id);
    }
    Unifi_instances[bus_id] = priv;
    In_use[bus_id] = UNIFI_DEV_IN_USE;

    /* Save the netdev_priv for use by the netdev event callback mechanism */
    Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES] = netdev_priv(priv->netdev[0]);

    /* Initialise the mini-coredump capture buffers */
    csrResult = unifi_coredump_init(priv->card, (u16)coredump_max);
    if (csrResult != CSR_RESULT_SUCCESS) {
        unifi_error(priv, "Couldn't allocate mini-coredump buffers\n");
    }

    /* Create the character device nodes */
    r = uf_create_device_nodes(priv, bus_id);
    if (r) {
        goto failed1;
    }

    /*
     * We use the slot number as unifi device index.
     */
    scnprintf(priv->proc_entry_name, 64, "driver/unifi%d", priv->instance);
    /*
     * The following complex casting is in place in order to eliminate 64-bit compilation warning
     * "cast to/from pointer from/to integer of different size"
     */
    if (!create_proc_read_entry(priv->proc_entry_name, 0, 0,
                uf_read_proc, (void *)(long)priv->instance))
    {
        unifi_error(priv, "unifi: can't create /proc/driver/unifi\n");
    }

    /* Allocate the net_device for interfaces other than 0. */
    {
        int i;
        priv->totalInterfaceCount =0;

        for(i=1;i<CSR_WIFI_NUM_INTERFACES;i++)
        {
            if( !uf_alloc_netdevice_for_other_interfaces(priv,i) )
            {
                /* error occured while allocating the net_device for interface[i]. The net_device are
                 * allocated for the interfaces with id<i. Dont worry, all the allocated net_device will
                 * be releasing chen the control goes to the label failed0.
                 */
                unifi_error(priv, "Failed to allocate driver private for interface[%d]\n",i);
                goto failed0;
            }
            else
            {
                SET_NETDEV_DEV(priv->netdev[i], dev);

                /* We are not ready to send data yet. */
                netif_carrier_off(priv->netdev[i]);

                /* Save the netdev_priv for use by the netdev event callback mechanism */
                Unifi_netdev_instances[bus_id * CSR_WIFI_NUM_INTERFACES + i] = netdev_priv(priv->netdev[i]);
            }
        }

        for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++)
        {
            netInterface_priv_t *interfacePriv = priv->interfacePriv[i];
            interfacePriv->netdev_registered=0;
        }
    }

#ifdef CSR_WIFI_RX_PATH_SPLIT
    if (signal_buffer_init(priv, CSR_WIFI_RX_SIGNAL_BUFFER_SIZE))
    {
        unifi_error(priv,"Failed to allocate shared memory for T-H signals\n");
        goto failed2;
    }
    priv->rx_workqueue = create_singlethread_workqueue("rx_workq");
    if (priv->rx_workqueue == NULL) {
        unifi_error(priv,"create_singlethread_workqueue failed \n");
        goto failed3;
    }
    INIT_WORK(&priv->rx_work_struct, rx_wq_handler);
#endif

#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
    if (log_hip_signals)
    {
        uf_register_hip_offline_debug(priv);
    }
#endif

    /* Initialise the SME related threads and parameters */
    r = uf_sme_init(priv);
    if (r) {
        unifi_error(priv, "SME initialisation failed.\n");
        goto failed4;
    }

    /*
     * Run the userspace helper program (unififw) to perform
     * the device initialisation.
     */
    unifi_trace(priv, UDBG1, "run UniFi helper app...\n");
    r = uf_run_unifihelper(priv);
    if (r) {
        unifi_notice(priv, "unable to run UniFi helper app\n");
        /* Not a fatal error. */
    }

    up(&Unifi_instance_mutex);

    return priv;

failed4:
#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
if (log_hip_signals)
{
    uf_unregister_hip_offline_debug(priv);
}
#endif
#ifdef CSR_WIFI_RX_PATH_SPLIT
    flush_workqueue(priv->rx_workqueue);
    destroy_workqueue(priv->rx_workqueue);
failed3:
    signal_buffer_free(priv,CSR_WIFI_RX_SIGNAL_BUFFER_SIZE);
failed2:
#endif
    /* Remove the device nodes */
    uf_destroy_device_nodes(priv);
failed1:
    /* Deregister priv->netdev_client */
    ul_deregister_client(priv->netdev_client);

failed0:
    if (priv && priv->card) {
        unifi_coredump_free(priv->card);
        unifi_free_card(priv->card);
    }
    if (priv) {
        uf_free_netdevice(priv);
    }

    up(&Unifi_instance_mutex);

    return NULL;
} /* register_unifi_sdio() */


/*
 * ---------------------------------------------------------------------------
 *  ask_unifi_sdio_cleanup
 *
 *      We can not free our private context, until all the char device
 *      clients have closed the file handles. unregister_unifi_sdio() which
 *      is called when a card is removed, waits on Unifi_cleanup_wq until
 *      the reference count becomes zero. It is time to wake it up now.
 *
 *  Arguments:
 *      priv          Pointer to driver context.
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
static void
ask_unifi_sdio_cleanup(unifi_priv_t *priv)
{

    /*
     * Now clear the flag that says the old instance is in use.
     * This is used to prevent a new instance being started before old
     * one has finshed closing down, for example if bounce makes the card
     * appear to be ejected and re-inserted quickly.
     */
    In_use[priv->instance] = UNIFI_DEV_CLEANUP;

    unifi_trace(NULL, UDBG5, "ask_unifi_sdio_cleanup: wake up cleanup workqueue.\n");
    wake_up(&Unifi_cleanup_wq);

} /* ask_unifi_sdio_cleanup() */


/*
 * ---------------------------------------------------------------------------
 *  cleanup_unifi_sdio
 *
 *      Release any resources owned by a unifi instance.
 *
 *  Arguments:
 *      priv          Pointer to the instance to free.
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
static void
cleanup_unifi_sdio(unifi_priv_t *priv)
{
    int priv_instance;
    int i;
    static const CsrWifiMacAddress broadcast_address = {{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}};

    /* Remove the device nodes */
    uf_destroy_device_nodes(priv);

    /* Mark this device as gone away by NULLing the entry in Unifi_instances */
    Unifi_instances[priv->instance] = NULL;

    unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: remove_proc_entry\n");
    /*
     * Free the children of priv before unifi_free_netdevice() frees
     * the priv struct
     */
    remove_proc_entry(priv->proc_entry_name, 0);


    /* Unregister netdev as a client. */
    if (priv->netdev_client) {
        unifi_trace(priv, UDBG2, "Netdev client (id:%d s:0x%X) is unregistered\n",
                priv->netdev_client->client_id, priv->netdev_client->sender_id);
        ul_deregister_client(priv->netdev_client);
    }

    /* Destroy the SME related threads and parameters */
    uf_sme_deinit(priv);

#ifdef CSR_SME_USERSPACE
    priv->smepriv = NULL;
#endif

#ifdef CSR_WIFI_HIP_DEBUG_OFFLINE
    if (log_hip_signals)
    {
        uf_unregister_hip_offline_debug(priv);
    }
#endif

    /* Free any packets left in the Rx queues */
    for(i=0;i<CSR_WIFI_NUM_INTERFACES;i++)
    {
        uf_free_pending_rx_packets(priv, UF_UNCONTROLLED_PORT_Q, broadcast_address,i);
        uf_free_pending_rx_packets(priv, UF_CONTROLLED_PORT_Q, broadcast_address,i);
    }
    /*
     * We need to free the resources held by the core, which include tx skbs,
     * otherwise we can not call unregister_netdev().
     */
    if (priv->card) {
        unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: free card\n");
        unifi_coredump_free(priv->card);
        unifi_free_card(priv->card);
        priv->card = NULL;
    }

    /*
     * Unregister the network device.
     * We can not unregister the netdev before we release
     * all pending packets in the core.
     */
    uf_unregister_netdev(priv);
    priv->totalInterfaceCount = 0;

    /* Clear the table of registered netdev_priv's */
    for (i = 0; i < CSR_WIFI_NUM_INTERFACES; i++) {
        Unifi_netdev_instances[priv->instance * CSR_WIFI_NUM_INTERFACES + i] = NULL;
    }

    unifi_trace(priv, UDBG5, "cleanup_unifi_sdio: uf_free_netdevice\n");
    /*
     * When uf_free_netdevice() returns, the priv is invalid
     * so we need to remember the instance to clear the global flag later.
     */
    priv_instance = priv->instance;

#ifdef CSR_WIFI_RX_PATH_SPLIT
    flush_workqueue(priv->rx_workqueue);
    destroy_workqueue(priv->rx_workqueue);
    signal_buffer_free(priv,CSR_WIFI_RX_SIGNAL_BUFFER_SIZE);
#endif

    /* Priv is freed as part of the net_device */
    uf_free_netdevice(priv);

    /*
     * Now clear the flag that says the old instance is in use.
     * This is used to prevent a new instance being started before old
     * one has finshed closing down, for example if bounce makes the card
     * appear to be ejected and re-inserted quickly.
     */
    In_use[priv_instance] = UNIFI_DEV_NOT_IN_USE;

    unifi_trace(NULL, UDBG5, "cleanup_unifi_sdio: DONE.\n");

} /* cleanup_unifi_sdio() */


/*
 * ---------------------------------------------------------------------------
 *  unregister_unifi_sdio
 *
 *      Call from SDIO driver when it detects that UniFi has been removed.
 *
 *  Arguments:
 *      bus_id          Number of the card that was ejected.
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
static void
unregister_unifi_sdio(int bus_id)
{
    unifi_priv_t *priv;
    int interfaceTag=0;
    u8 reason = CONFIG_IND_EXIT;

    if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
        unifi_error(NULL, "unregister_unifi_sdio: invalid device %d\n",
                bus_id);
        return;
    }

    priv = Unifi_instances[bus_id];
    if (priv == NULL) {
        unifi_error(priv, "unregister_unifi_sdio: device %d is not registered\n",
                bus_id);
        return;
    }

    /* Stop the network traffic before freeing the core. */
    for(interfaceTag=0;interfaceTag<priv->totalInterfaceCount;interfaceTag++)
    {
        netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];
        if(interfacePriv->netdev_registered)
        {
            netif_carrier_off(priv->netdev[interfaceTag]);
            netif_tx_stop_all_queues(priv->netdev[interfaceTag]);
        }
    }

#ifdef CSR_NATIVE_LINUX
    /*
     * If the unifi thread was started, signal it to stop.  This
     * should cause any userspace processes with open unifi device to
     * close them.
     */
    uf_stop_thread(priv, &priv->bh_thread);

    /* Unregister the interrupt handler */
    if (csr_sdio_linux_remove_irq(priv->sdio)) {
        unifi_notice(priv,
                "csr_sdio_linux_remove_irq failed to talk to card.\n");
    }

    /* Ensure no MLME functions are waiting on a the mlme_event semaphore. */
    uf_abort_mlme(priv);
#endif /* CSR_NATIVE_LINUX */

    ul_log_config_ind(priv, &reason, sizeof(u8));

    /* Deregister the UDI hook from the core. */
    unifi_remove_udi_hook(priv->card, logging_handler);

    uf_put_instance(bus_id);

    /*
     * Wait until the device is cleaned up. i.e., when all userspace
     * processes have closed any open unifi devices.
     */
    wait_event(Unifi_cleanup_wq, In_use[bus_id] == UNIFI_DEV_CLEANUP);
    unifi_trace(NULL, UDBG5, "Received clean up event\n");

    /* Now we can free the private context and the char device nodes */
    cleanup_unifi_sdio(priv);

} /* unregister_unifi_sdio() */


/*
 * ---------------------------------------------------------------------------
 *  uf_find_instance
 *
 *      Find the context structure for a given UniFi device instance.
 *
 *  Arguments:
 *      inst            The instance number to look for.
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
unifi_priv_t *
uf_find_instance(int inst)
{
    if ((inst < 0) || (inst >= MAX_UNIFI_DEVS)) {
        return NULL;
    }
    return Unifi_instances[inst];
} /* uf_find_instance() */


/*
 * ---------------------------------------------------------------------------
 *  uf_find_priv
 *
 *      Find the device instance for a given context structure.
 *
 *  Arguments:
 *      priv            The context structure pointer to look for.
 *
 *  Returns:
 *      index of instance, -1 otherwise.
 * ---------------------------------------------------------------------------
 */
int
uf_find_priv(unifi_priv_t *priv)
{
    int inst;

    if (!priv) {
        return -1;
    }

    for (inst = 0; inst < MAX_UNIFI_DEVS; inst++) {
        if (Unifi_instances[inst] == priv) {
            return inst;
        }
    }

    return -1;
} /* uf_find_priv() */

/*
 * ---------------------------------------------------------------------------
 *  uf_find_netdev_priv
 *
 *      Find the device instance for a given netdev context structure.
 *
 *  Arguments:
 *      priv            The context structure pointer to look for.
 *
 *  Returns:
 *      index of instance, -1 otherwise.
 * ---------------------------------------------------------------------------
 */
int
uf_find_netdev_priv(netInterface_priv_t *priv)
{
    int inst;

    if (!priv) {
        return -1;
    }

    for (inst = 0; inst < MAX_UNIFI_DEVS * CSR_WIFI_NUM_INTERFACES; inst++) {
        if (Unifi_netdev_instances[inst] == priv) {
            return inst;
        }
    }

    return -1;
} /* uf_find_netdev_priv() */

/*
 * ---------------------------------------------------------------------------
 *  uf_get_instance
 *
 *      Find the context structure for a given UniFi device instance
 *      and increment the reference count.
 *
 *  Arguments:
 *      inst            The instance number to look for.
 *
 *  Returns:
 *      Pointer to the instance or NULL if no instance exists.
 * ---------------------------------------------------------------------------
 */
unifi_priv_t *
uf_get_instance(int inst)
{
    unifi_priv_t *priv;

    down(&Unifi_instance_mutex);

    priv = uf_find_instance(inst);
    if (priv) {
        priv->ref_count++;
    }

    up(&Unifi_instance_mutex);

    return priv;
}

/*
 * ---------------------------------------------------------------------------
 *  uf_put_instance
 *
 *      Decrement the context reference count, freeing resources and
 *      shutting down the driver when the count reaches zero.
 *
 *  Arguments:
 *      inst            The instance number to look for.
 *
 *  Returns:
 *      Pointer to the instance or NULL if no instance exists.
 * ---------------------------------------------------------------------------
 */
void
uf_put_instance(int inst)
{
    unifi_priv_t *priv;

    down(&Unifi_instance_mutex);

    priv = uf_find_instance(inst);
    if (priv) {
        priv->ref_count--;
        if (priv->ref_count == 0) {
            ask_unifi_sdio_cleanup(priv);
        }
    }

    up(&Unifi_instance_mutex);
}


/*
 * ---------------------------------------------------------------------------
 *  uf_read_proc
 *
 *      Read method for driver node in /proc/driver/unifi0
 *
 *  Arguments:
 *      page
 *      start
 *      offset
 *      count
 *      eof
 *      data
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
#ifdef CONFIG_PROC_FS
static int
uf_read_proc(char *page, char **start, off_t offset, int count,
        int *eof, void *data)
{
#define UNIFI_DEBUG_TXT_BUFFER 8*1024
    unifi_priv_t *priv;
    int actual_amount_to_copy;
    char *p, *orig_p;
    s32 remain = UNIFI_DEBUG_TXT_BUFFER;
    s32 written;
    int i;

    /*
    * The following complex casting is in place in order to eliminate 64-bit compilation warning
    * "cast to/from pointer from/to integer of different size"
    */
    priv = uf_find_instance((int)(long)data);
    if (!priv) {
        return 0;
    }

    p = kmalloc( UNIFI_DEBUG_TXT_BUFFER, GFP_KERNEL );

    orig_p = p;

    written = scnprintf(p, remain, "UniFi SDIO Driver: %s %s %s\n",
            CSR_WIFI_VERSION, __DATE__, __TIME__);
    UNIFI_SNPRINTF_RET(p, remain, written);
#ifdef CSR_SME_USERSPACE
    written = scnprintf(p, remain, "SME: CSR userspace ");
    UNIFI_SNPRINTF_RET(p, remain, written);
#ifdef CSR_SUPPORT_WEXT
    written = scnprintf(p, remain, "with WEXT support\n");
#else
    written = scnprintf(p, remain, "\n");
#endif /* CSR_SUPPORT_WEXT */
    UNIFI_SNPRINTF_RET(p, remain, written);
#endif /* CSR_SME_USERSPACE */
#ifdef CSR_NATIVE_LINUX
    written = scnprintf(p, remain, "SME: native\n");
    UNIFI_SNPRINTF_RET(p, remain, written);
#endif

#ifdef CSR_SUPPORT_SME
    written = scnprintf(p, remain,
            "Firmware (ROM) build:%u, Patch:%u\n",
            priv->card_info.fw_build,
            priv->sme_versions.firmwarePatch);
    UNIFI_SNPRINTF_RET(p, remain, written);
#endif
    p += unifi_print_status(priv->card, p, &remain);

    written = scnprintf(p, remain, "Last dbg str: %s\n",
            priv->last_debug_string);
    UNIFI_SNPRINTF_RET(p, remain, written);

    written = scnprintf(p, remain, "Last dbg16:");
    UNIFI_SNPRINTF_RET(p, remain, written);
    for (i = 0; i < 8; i++) {
        written = scnprintf(p, remain, " %04X",
                priv->last_debug_word16[i]);
        UNIFI_SNPRINTF_RET(p, remain, written);
    }
    written = scnprintf(p, remain, "\n");
    UNIFI_SNPRINTF_RET(p, remain, written);
    written = scnprintf(p, remain, "           ");
    UNIFI_SNPRINTF_RET(p, remain, written);
    for (; i < 16; i++) {
        written = scnprintf(p, remain, " %04X",
                priv->last_debug_word16[i]);
        UNIFI_SNPRINTF_RET(p, remain, written);
    }
    written = scnprintf(p, remain, "\n");
    UNIFI_SNPRINTF_RET(p, remain, written);
    *start = page;

    written = UNIFI_DEBUG_TXT_BUFFER - remain;

    if( offset >= written )
    {
        *eof = 1;
        kfree( orig_p );
        return(0);
    }

    if( offset + count > written )
    {
        actual_amount_to_copy = written - offset;
        *eof = 1;
    }
    else
    {
        actual_amount_to_copy = count;
    }

    memcpy( page, &(orig_p[offset]), actual_amount_to_copy );

    kfree( orig_p );

    return( actual_amount_to_copy );
} /* uf_read_proc() */
#endif




static void
uf_lx_suspend(CsrSdioFunction *sdio_ctx)
{
    unifi_priv_t *priv = sdio_ctx->driverData;
    unifi_suspend(priv);

    CsrSdioSuspendAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
}

static void
uf_lx_resume(CsrSdioFunction *sdio_ctx)
{
    unifi_priv_t *priv = sdio_ctx->driverData;
    unifi_resume(priv);

    CsrSdioResumeAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
}

static int active_slot = MAX_UNIFI_DEVS;
static struct device *os_devices[MAX_UNIFI_DEVS];

void
uf_add_os_device(int bus_id, struct device *os_device)
{
    if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
        unifi_error(NULL, "uf_add_os_device: invalid device %d\n",
                bus_id);
        return;
    }

    active_slot = bus_id;
    os_devices[bus_id] = os_device;
} /* uf_add_os_device() */

void
uf_remove_os_device(int bus_id)
{
    if ((bus_id < 0) || (bus_id >= MAX_UNIFI_DEVS)) {
        unifi_error(NULL, "uf_remove_os_device: invalid device %d\n",
                bus_id);
        return;
    }

    active_slot = bus_id;
    os_devices[bus_id] = NULL;
} /* uf_remove_os_device() */

static void
uf_sdio_inserted(CsrSdioFunction *sdio_ctx)
{
	unifi_priv_t *priv;

	unifi_trace(NULL, UDBG5, "uf_sdio_inserted(0x%p), slot_id=%d, dev=%p\n",
		      sdio_ctx, active_slot, os_devices[active_slot]);

	priv = register_unifi_sdio(sdio_ctx, active_slot, os_devices[active_slot]);
	if (priv == NULL) {
		CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_FAILURE);
		return;
	}

	sdio_ctx->driverData = priv;

	CsrSdioInsertedAcknowledge(sdio_ctx, CSR_RESULT_SUCCESS);
} /* uf_sdio_inserted() */


static void
uf_sdio_removed(CsrSdioFunction *sdio_ctx)
{
	unregister_unifi_sdio(active_slot);
	CsrSdioRemovedAcknowledge(sdio_ctx);
} /* uf_sdio_removed() */


static void
uf_sdio_dsr_handler(CsrSdioFunction *sdio_ctx)
{
	unifi_priv_t *priv = sdio_ctx->driverData;

	unifi_sdio_interrupt_handler(priv->card);
} /* uf_sdio_dsr_handler() */

/*
 * ---------------------------------------------------------------------------
 *  uf_sdio_int_handler
 *
 *      Interrupt callback function for SDIO interrupts.
 *      This is called in kernel context (i.e. not interrupt context).
 *      We retrieve the unifi context pointer and call the main UniFi
 *      interrupt handler.
 *
 *  Arguments:
 *      fdev      SDIO context pointer
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
static CsrSdioInterruptDsrCallback
uf_sdio_int_handler(CsrSdioFunction *sdio_ctx)
{
	return uf_sdio_dsr_handler;
} /* uf_sdio_int_handler() */




static CsrSdioFunctionId unifi_ids[] =
{
	{
		.manfId = SDIO_MANF_ID_CSR,
		.cardId = SDIO_CARD_ID_UNIFI_3,
		.sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_3,
		.sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE,
	},
	{
		.manfId = SDIO_MANF_ID_CSR,
		.cardId = SDIO_CARD_ID_UNIFI_4,
		.sdioFunction = SDIO_WLAN_FUNC_ID_UNIFI_4,
		.sdioInterface = CSR_SDIO_ANY_SDIO_INTERFACE,
	}
};


/*
 * Structure to register with the glue layer.
 */
static CsrSdioFunctionDriver unifi_sdioFunction_drv =
{
	.inserted = uf_sdio_inserted,
	.removed = uf_sdio_removed,
	.intr = uf_sdio_int_handler,
	.suspend = uf_lx_suspend,
	.resume = uf_lx_resume,

	.ids = unifi_ids,
	.idsCount = sizeof(unifi_ids) / sizeof(unifi_ids[0])
};


/*
 * ---------------------------------------------------------------------------
 *  uf_sdio_load
 *  uf_sdio_unload
 *
 *      These functions are called from the main module load and unload
 *      functions. They perform the appropriate operations for the monolithic
 *      driver.
 *
 *  Arguments:
 *      None.
 *
 *  Returns:
 *      None.
 * ---------------------------------------------------------------------------
 */
int __init
uf_sdio_load(void)
{
	CsrResult csrResult;

	csrResult = CsrSdioFunctionDriverRegister(&unifi_sdioFunction_drv);
	if (csrResult != CSR_RESULT_SUCCESS) {
		unifi_error(NULL, "Failed to register UniFi SDIO driver: csrResult=%d\n", csrResult);
		return -EIO;
	}

	return 0;
} /* uf_sdio_load() */



void __exit
uf_sdio_unload(void)
{
	CsrSdioFunctionDriverUnregister(&unifi_sdioFunction_drv);
} /* uf_sdio_unload() */