summaryrefslogtreecommitdiffstats
path: root/drivers/usb/atm/cxacru.c
blob: 9aea43a8c4adce959b3aafcc1b171f807b2fc1a7 (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
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
/******************************************************************************
 *  cxacru.c  -  driver for USB ADSL modems based on
 *               Conexant AccessRunner chipset
 *
 *  Copyright (C) 2004 David Woodhouse, Duncan Sands, Roman Kagan
 *  Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru)
 *  Copyright (C) 2007 Simon Arlott
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 *  this program; if not, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 ******************************************************************************/

/*
 *  Credit is due for Josep Comas, who created the original patch to speedtch.c
 *  to support the different padding used by the AccessRunner (now generalized
 *  into usbatm), and the userspace firmware loading utility.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>

#include "usbatm.h"

#define DRIVER_AUTHOR	"Roman Kagan, David Woodhouse, Duncan Sands, Simon Arlott"
#define DRIVER_VERSION	"0.3"
#define DRIVER_DESC	"Conexant AccessRunner ADSL USB modem driver"

static const char cxacru_driver_name[] = "cxacru";

#define CXACRU_EP_CMD		0x01	/* Bulk/interrupt in/out */
#define CXACRU_EP_DATA		0x02	/* Bulk in/out */

#define CMD_PACKET_SIZE		64	/* Should be maxpacket(ep)? */

/* Addresses */
#define PLLFCLK_ADDR	0x00350068
#define PLLBCLK_ADDR	0x0035006c
#define SDRAMEN_ADDR	0x00350010
#define FW_ADDR		0x00801000
#define BR_ADDR		0x00180600
#define SIG_ADDR	0x00180500
#define BR_STACK_ADDR	0x00187f10

/* Values */
#define SDRAM_ENA	0x1

#define CMD_TIMEOUT	2000	/* msecs */
#define POLL_INTERVAL	1	/* secs */

/* commands for interaction with the modem through the control channel before
 * firmware is loaded  */
enum cxacru_fw_request {
	FW_CMD_ERR,
	FW_GET_VER,
	FW_READ_MEM,
	FW_WRITE_MEM,
	FW_RMW_MEM,
	FW_CHECKSUM_MEM,
	FW_GOTO_MEM,
};

/* commands for interaction with the modem through the control channel once
 * firmware is loaded  */
enum cxacru_cm_request {
	CM_REQUEST_UNDEFINED = 0x80,
	CM_REQUEST_TEST,
	CM_REQUEST_CHIP_GET_MAC_ADDRESS,
	CM_REQUEST_CHIP_GET_DP_VERSIONS,
	CM_REQUEST_CHIP_ADSL_LINE_START,
	CM_REQUEST_CHIP_ADSL_LINE_STOP,
	CM_REQUEST_CHIP_ADSL_LINE_GET_STATUS,
	CM_REQUEST_CHIP_ADSL_LINE_GET_SPEED,
	CM_REQUEST_CARD_INFO_GET,
	CM_REQUEST_CARD_DATA_GET,
	CM_REQUEST_CARD_DATA_SET,
	CM_REQUEST_COMMAND_HW_IO,
	CM_REQUEST_INTERFACE_HW_IO,
	CM_REQUEST_CARD_SERIAL_DATA_PATH_GET,
	CM_REQUEST_CARD_SERIAL_DATA_PATH_SET,
	CM_REQUEST_CARD_CONTROLLER_VERSION_GET,
	CM_REQUEST_CARD_GET_STATUS,
	CM_REQUEST_CARD_GET_MAC_ADDRESS,
	CM_REQUEST_CARD_GET_DATA_LINK_STATUS,
	CM_REQUEST_MAX,
};

/* reply codes to the commands above */
enum cxacru_cm_status {
	CM_STATUS_UNDEFINED,
	CM_STATUS_SUCCESS,
	CM_STATUS_ERROR,
	CM_STATUS_UNSUPPORTED,
	CM_STATUS_UNIMPLEMENTED,
	CM_STATUS_PARAMETER_ERROR,
	CM_STATUS_DBG_LOOPBACK,
	CM_STATUS_MAX,
};

/* indices into CARD_INFO_GET return array */
enum cxacru_info_idx {
	CXINF_DOWNSTREAM_RATE,
	CXINF_UPSTREAM_RATE,
	CXINF_LINK_STATUS,
	CXINF_LINE_STATUS,
	CXINF_MAC_ADDRESS_HIGH,
	CXINF_MAC_ADDRESS_LOW,
	CXINF_UPSTREAM_SNR_MARGIN,
	CXINF_DOWNSTREAM_SNR_MARGIN,
	CXINF_UPSTREAM_ATTENUATION,
	CXINF_DOWNSTREAM_ATTENUATION,
	CXINF_TRANSMITTER_POWER,
	CXINF_UPSTREAM_BITS_PER_FRAME,
	CXINF_DOWNSTREAM_BITS_PER_FRAME,
	CXINF_STARTUP_ATTEMPTS,
	CXINF_UPSTREAM_CRC_ERRORS,
	CXINF_DOWNSTREAM_CRC_ERRORS,
	CXINF_UPSTREAM_FEC_ERRORS,
	CXINF_DOWNSTREAM_FEC_ERRORS,
	CXINF_UPSTREAM_HEC_ERRORS,
	CXINF_DOWNSTREAM_HEC_ERRORS,
	CXINF_LINE_STARTABLE,
	CXINF_MODULATION,
	CXINF_ADSL_HEADEND,
	CXINF_ADSL_HEADEND_ENVIRONMENT,
	CXINF_CONTROLLER_VERSION,
	/* dunno what the missing two mean */
	CXINF_MAX = 0x1c,
};

enum cxacru_poll_state {
	CXPOLL_STOPPING,
	CXPOLL_STOPPED,
	CXPOLL_POLLING,
	CXPOLL_SHUTDOWN
};

struct cxacru_modem_type {
	u32 pll_f_clk;
	u32 pll_b_clk;
	int boot_rom_patch;
};

struct cxacru_data {
	struct usbatm_data *usbatm;

	const struct cxacru_modem_type *modem_type;

	int line_status;
	struct mutex adsl_state_serialize;
	int adsl_status;
	struct delayed_work poll_work;
	u32 card_info[CXINF_MAX];
	struct mutex poll_state_serialize;
	enum cxacru_poll_state poll_state;

	/* contol handles */
	struct mutex cm_serialize;
	u8 *rcv_buf;
	u8 *snd_buf;
	struct urb *rcv_urb;
	struct urb *snd_urb;
	struct completion rcv_done;
	struct completion snd_done;
};

static int cxacru_cm(struct cxacru_data *instance, enum cxacru_cm_request cm,
	u8 *wdata, int wsize, u8 *rdata, int rsize);
static void cxacru_poll_status(struct work_struct *work);

/* Card info exported through sysfs */
#define CXACRU__ATTR_INIT(_name) \
static DEVICE_ATTR(_name, S_IRUGO, cxacru_sysfs_show_##_name, NULL)

#define CXACRU_CMD_INIT(_name) \
static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, \
	cxacru_sysfs_show_##_name, cxacru_sysfs_store_##_name)

#define CXACRU_ATTR_INIT(_value, _type, _name) \
static ssize_t cxacru_sysfs_show_##_name(struct device *dev, \
	struct device_attribute *attr, char *buf) \
{ \
	struct usb_interface *intf = to_usb_interface(dev); \
	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf); \
	struct cxacru_data *instance = usbatm_instance->driver_data; \
	return cxacru_sysfs_showattr_##_type(instance->card_info[_value], buf); \
} \
CXACRU__ATTR_INIT(_name)

#define CXACRU_ATTR_CREATE(_v, _t, _name) CXACRU_DEVICE_CREATE_FILE(_name)
#define CXACRU_CMD_CREATE(_name)          CXACRU_DEVICE_CREATE_FILE(_name)
#define CXACRU__ATTR_CREATE(_name)        CXACRU_DEVICE_CREATE_FILE(_name)

#define CXACRU_ATTR_REMOVE(_v, _t, _name) CXACRU_DEVICE_REMOVE_FILE(_name)
#define CXACRU_CMD_REMOVE(_name)          CXACRU_DEVICE_REMOVE_FILE(_name)
#define CXACRU__ATTR_REMOVE(_name)        CXACRU_DEVICE_REMOVE_FILE(_name)

static ssize_t cxacru_sysfs_showattr_u32(u32 value, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u\n", value);
}

static ssize_t cxacru_sysfs_showattr_s8(s8 value, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", value);
}

static ssize_t cxacru_sysfs_showattr_dB(s16 value, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d.%02u\n",
					value / 100, abs(value) % 100);
}

static ssize_t cxacru_sysfs_showattr_bool(u32 value, char *buf)
{
	static char *str[] = { "no", "yes" };
	if (unlikely(value >= ARRAY_SIZE(str)))
		return snprintf(buf, PAGE_SIZE, "%u\n", value);
	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_LINK(u32 value, char *buf)
{
	static char *str[] = { NULL, "not connected", "connected", "lost" };
	if (unlikely(value >= ARRAY_SIZE(str) || str[value] == NULL))
		return snprintf(buf, PAGE_SIZE, "%u\n", value);
	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_LINE(u32 value, char *buf)
{
	static char *str[] = { "down", "attempting to activate",
		"training", "channel analysis", "exchange", "up",
		"waiting", "initialising"
	};
	if (unlikely(value >= ARRAY_SIZE(str)))
		return snprintf(buf, PAGE_SIZE, "%u\n", value);
	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_showattr_MODU(u32 value, char *buf)
{
	static char *str[] = {
			NULL,
			"ANSI T1.413",
			"ITU-T G.992.1 (G.DMT)",
			"ITU-T G.992.2 (G.LITE)"
	};
	if (unlikely(value >= ARRAY_SIZE(str) || str[value] == NULL))
		return snprintf(buf, PAGE_SIZE, "%u\n", value);
	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

/*
 * This could use MAC_ADDRESS_HIGH and MAC_ADDRESS_LOW, but since
 * this data is already in atm_dev there's no point.
 *
 * MAC_ADDRESS_HIGH = 0x????5544
 * MAC_ADDRESS_LOW  = 0x33221100
 * Where 00-55 are bytes 0-5 of the MAC.
 */
static ssize_t cxacru_sysfs_show_mac_address(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
	struct atm_dev *atm_dev = usbatm_instance->atm_dev;

	return snprintf(buf, PAGE_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x\n",
			atm_dev->esi[0], atm_dev->esi[1], atm_dev->esi[2],
			atm_dev->esi[3], atm_dev->esi[4], atm_dev->esi[5]);
}

static ssize_t cxacru_sysfs_show_adsl_state(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
	struct cxacru_data *instance = usbatm_instance->driver_data;
	u32 value = instance->card_info[CXINF_LINE_STARTABLE];

	static char *str[] = { "running", "stopped" };
	if (unlikely(value >= ARRAY_SIZE(str)))
		return snprintf(buf, PAGE_SIZE, "%u\n", value);
	return snprintf(buf, PAGE_SIZE, "%s\n", str[value]);
}

static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct usb_interface *intf = to_usb_interface(dev);
	struct usbatm_data *usbatm_instance = usb_get_intfdata(intf);
	struct cxacru_data *instance = usbatm_instance->driver_data;
	int ret;
	int poll = -1;
	char str_cmd[8];
	int len = strlen(buf);

	if (!capable(CAP_NET_ADMIN))
		return -EACCES;

	ret = sscanf(buf, "%7s", str_cmd);
	if (ret != 1)
		return -EINVAL;
	ret = 0;

	if (mutex_lock_interruptible(&instance->adsl_state_serialize))
		return -ERESTARTSYS;

	if (!strcmp(str_cmd, "stop") || !strcmp(str_cmd, "restart")) {
		ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_STOP, NULL, 0, NULL, 0);
		if (ret < 0) {
			atm_err(usbatm_instance, "change adsl state:"
				" CHIP_ADSL_LINE_STOP returned %d\n", ret);

			ret = -EIO;
		} else {
			ret = len;
			poll = CXPOLL_STOPPED;
		}
	}

	/* Line status is only updated every second
	 * and the device appears to only react to
	 * START/STOP every second too. Wait 1.5s to
	 * be sure that restart will have an effect. */
	if (!strcmp(str_cmd, "restart"))
		msleep(1500);

	if (!strcmp(str_cmd, "start") || !strcmp(str_cmd, "restart")) {
		ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);
		if (ret < 0) {
			atm_err(usbatm_instance, "change adsl state:"
				" CHIP_ADSL_LINE_START returned %d\n", ret);

			ret = -EIO;
		} else {
			ret = len;
			poll = CXPOLL_POLLING;
		}
	}

	if (!strcmp(str_cmd, "poll")) {
		ret = len;
		poll = CXPOLL_POLLING;
	}

	if (ret == 0) {
		ret = -EINVAL;
		poll = -1;
	}

	if (poll == CXPOLL_POLLING) {
		mutex_lock(&instance->poll_state_serialize);
		switch (instance->poll_state) {
		case CXPOLL_STOPPED:
			/* start polling */
			instance->poll_state = CXPOLL_POLLING;
			break;

		case CXPOLL_STOPPING:
			/* abort stop request */
			instance->poll_state = CXPOLL_POLLING;
		case CXPOLL_POLLING:
		case CXPOLL_SHUTDOWN:
			/* don't start polling */
			poll = -1;
		}
		mutex_unlock(&instance->poll_state_serialize);
	} else if (poll == CXPOLL_STOPPED) {
		mutex_lock(&instance->poll_state_serialize);
		/* request stop */
		if (instance->poll_state == CXPOLL_POLLING)
			instance->poll_state = CXPOLL_STOPPING;
		mutex_unlock(&instance->poll_state_serialize);
	}

	mutex_unlock(&instance->adsl_state_serialize);

	if (poll == CXPOLL_POLLING)
		cxacru_poll_status(&instance->poll_work.work);

	return ret;
}

/*
 * All device attributes are included in CXACRU_ALL_FILES
 * so that the same list can be used multiple times:
 *     INIT   (define the device attributes)
 *     CREATE (create all the device files)
 *     REMOVE (remove all the device files)
 *
 * With the last two being defined as needed in the functions
 * they are used in before calling CXACRU_ALL_FILES()
 */
#define CXACRU_ALL_FILES(_action) \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_RATE,           u32,  downstream_rate); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_RATE,             u32,  upstream_rate); \
CXACRU_ATTR_##_action(CXINF_LINK_STATUS,               LINK, link_status); \
CXACRU_ATTR_##_action(CXINF_LINE_STATUS,               LINE, line_status); \
CXACRU__ATTR_##_action(                                      mac_address); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_SNR_MARGIN,       dB,   upstream_snr_margin); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_SNR_MARGIN,     dB,   downstream_snr_margin); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_ATTENUATION,      dB,   upstream_attenuation); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_ATTENUATION,    dB,   downstream_attenuation); \
CXACRU_ATTR_##_action(CXINF_TRANSMITTER_POWER,         s8,   transmitter_power); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_BITS_PER_FRAME,   u32,  upstream_bits_per_frame); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_BITS_PER_FRAME, u32,  downstream_bits_per_frame); \
CXACRU_ATTR_##_action(CXINF_STARTUP_ATTEMPTS,          u32,  startup_attempts); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_CRC_ERRORS,       u32,  upstream_crc_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_CRC_ERRORS,     u32,  downstream_crc_errors); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_FEC_ERRORS,       u32,  upstream_fec_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_FEC_ERRORS,     u32,  downstream_fec_errors); \
CXACRU_ATTR_##_action(CXINF_UPSTREAM_HEC_ERRORS,       u32,  upstream_hec_errors); \
CXACRU_ATTR_##_action(CXINF_DOWNSTREAM_HEC_ERRORS,     u32,  downstream_hec_errors); \
CXACRU_ATTR_##_action(CXINF_LINE_STARTABLE,            bool, line_startable); \
CXACRU_ATTR_##_action(CXINF_MODULATION,                MODU, modulation); \
CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND,              u32,  adsl_headend); \
CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND_ENVIRONMENT,  u32,  adsl_headend_environment); \
CXACRU_ATTR_##_action(CXINF_CONTROLLER_VERSION,        u32,  adsl_controller_version); \
CXACRU_CMD_##_action(                                        adsl_state);

CXACRU_ALL_FILES(INIT);

/* the following three functions are stolen from drivers/usb/core/message.c */
static void cxacru_blocking_completion(struct urb *urb)
{
	complete(urb->context);
}

static void cxacru_timeout_kill(unsigned long data)
{
	usb_unlink_urb((struct urb *) data);
}

static int cxacru_start_wait_urb(struct urb *urb, struct completion *done,
				 int* actual_length)
{
	struct timer_list timer;

	init_timer(&timer);
	timer.expires = jiffies + msecs_to_jiffies(CMD_TIMEOUT);
	timer.data = (unsigned long) urb;
	timer.function = cxacru_timeout_kill;
	add_timer(&timer);
	wait_for_completion(done);
	del_timer_sync(&timer);

	if (actual_length)
		*actual_length = urb->actual_length;
	return urb->status; /* must read status after completion */
}

static int cxacru_cm(struct cxacru_data *instance, enum cxacru_cm_request cm,
		     u8 *wdata, int wsize, u8 *rdata, int rsize)
{
	int ret, actlen;
	int offb, offd;
	const int stride = CMD_PACKET_SIZE - 4;
	u8 *wbuf = instance->snd_buf;
	u8 *rbuf = instance->rcv_buf;
	int wbuflen = ((wsize - 1) / stride + 1) * CMD_PACKET_SIZE;
	int rbuflen = ((rsize - 1) / stride + 1) * CMD_PACKET_SIZE;

	if (wbuflen > PAGE_SIZE || rbuflen > PAGE_SIZE) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "requested transfer size too large (%d, %d)\n",
				wbuflen, rbuflen);
		ret = -ENOMEM;
		goto fail;
	}

	mutex_lock(&instance->cm_serialize);

	/* submit reading urb before the writing one */
	init_completion(&instance->rcv_done);
	ret = usb_submit_urb(instance->rcv_urb, GFP_KERNEL);
	if (ret < 0) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "submit of read urb for cm %#x failed (%d)\n",
				cm, ret);
		goto fail;
	}

	memset(wbuf, 0, wbuflen);
	/* handle wsize == 0 */
	wbuf[0] = cm;
	for (offb = offd = 0; offd < wsize; offd += stride, offb += CMD_PACKET_SIZE) {
		wbuf[offb] = cm;
		memcpy(wbuf + offb + 4, wdata + offd, min_t(int, stride, wsize - offd));
	}

	instance->snd_urb->transfer_buffer_length = wbuflen;
	init_completion(&instance->snd_done);
	ret = usb_submit_urb(instance->snd_urb, GFP_KERNEL);
	if (ret < 0) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "submit of write urb for cm %#x failed (%d)\n",
				cm, ret);
		goto fail;
	}

	ret = cxacru_start_wait_urb(instance->snd_urb, &instance->snd_done, NULL);
	if (ret < 0) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "send of cm %#x failed (%d)\n", cm, ret);
		goto fail;
	}

	ret = cxacru_start_wait_urb(instance->rcv_urb, &instance->rcv_done, &actlen);
	if (ret < 0) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "receive of cm %#x failed (%d)\n", cm, ret);
		goto fail;
	}
	if (actlen % CMD_PACKET_SIZE || !actlen) {
		if (printk_ratelimit())
			usb_err(instance->usbatm, "invalid response length to cm %#x: %d\n",
				cm, actlen);
		ret = -EIO;
		goto fail;
	}

	/* check the return status and copy the data to the output buffer, if needed */
	for (offb = offd = 0; offd < rsize && offb < actlen; offb += CMD_PACKET_SIZE) {
		if (rbuf[offb] != cm) {
			if (printk_ratelimit())
				usb_err(instance->usbatm, "wrong cm %#x in response to cm %#x\n",
					rbuf[offb], cm);
			ret = -EIO;
			goto fail;
		}
		if (rbuf[offb + 1] != CM_STATUS_SUCCESS) {
			if (printk_ratelimit())
				usb_err(instance->usbatm, "response to cm %#x failed: %#x\n",
					cm, rbuf[offb + 1]);
			ret = -EIO;
			goto fail;
		}
		if (offd >= rsize)
			break;
		memcpy(rdata + offd, rbuf + offb + 4, min_t(int, stride, rsize - offd));
		offd += stride;
	}

	ret = offd;
	dbg("cm %#x", cm);
fail:
	mutex_unlock(&instance->cm_serialize);
	return ret;
}

static int cxacru_cm_get_array(struct cxacru_data *instance, enum cxacru_cm_request cm,
			       u32 *data, int size)
{
	int ret, len;
	__le32 *buf;
	int offb, offd;
	const int stride = CMD_PACKET_SIZE / (4 * 2) - 1;
	int buflen =  ((size - 1) / stride + 1 + size * 2) * 4;

	buf = kmalloc(buflen, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = cxacru_cm(instance, cm, NULL, 0, (u8 *) buf, buflen);
	if (ret < 0)
		goto cleanup;

	/* len > 0 && len % 4 == 0 guaranteed by cxacru_cm() */
	len = ret / 4;
	for (offb = 0; offb < len; ) {
		int l = le32_to_cpu(buf[offb++]);
		if (l > stride || l > (len - offb) / 2) {
			if (printk_ratelimit())
				usb_err(instance->usbatm, "invalid data length from cm %#x: %d\n",
					cm, l);
			ret = -EIO;
			goto cleanup;
		}
		while (l--) {
			offd = le32_to_cpu(buf[offb++]);
			if (offd >= size) {
				if (printk_ratelimit())
					usb_err(instance->usbatm, "wrong index %#x in response to cm %#x\n",
						offd, cm);
				ret = -EIO;
				goto cleanup;
			}
			data[offd] = le32_to_cpu(buf[offb++]);
		}
	}

	ret = 0;

cleanup:
	kfree(buf);
	return ret;
}

static int cxacru_card_status(struct cxacru_data *instance)
{
	int ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_STATUS, NULL, 0, NULL, 0);
	if (ret < 0) {		/* firmware not loaded */
		dbg("cxacru_adsl_start: CARD_GET_STATUS returned %d", ret);
		return ret;
	}
	return 0;
}

static void cxacru_remove_device_files(struct usbatm_data *usbatm_instance,
		struct atm_dev *atm_dev)
{
	struct usb_interface *intf = usbatm_instance->usb_intf;

	#define CXACRU_DEVICE_REMOVE_FILE(_name) \
		device_remove_file(&intf->dev, &dev_attr_##_name);
	CXACRU_ALL_FILES(REMOVE);
	#undef CXACRU_DEVICE_REMOVE_FILE
}

static int cxacru_atm_start(struct usbatm_data *usbatm_instance,
		struct atm_dev *atm_dev)
{
	struct cxacru_data *instance = usbatm_instance->driver_data;
	struct usb_interface *intf = usbatm_instance->usb_intf;
	/*
	struct atm_dev *atm_dev = usbatm_instance->atm_dev;
	*/
	int ret;
	int start_polling = 1;

	dbg("cxacru_atm_start");

	/* Read MAC address */
	ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_MAC_ADDRESS, NULL, 0,
			atm_dev->esi, sizeof(atm_dev->esi));
	if (ret < 0) {
		atm_err(usbatm_instance, "cxacru_atm_start: CARD_GET_MAC_ADDRESS returned %d\n", ret);
		return ret;
	}

	#define CXACRU_DEVICE_CREATE_FILE(_name) \
		ret = device_create_file(&intf->dev, &dev_attr_##_name); \
		if (unlikely(ret)) \
			goto fail_sysfs;
	CXACRU_ALL_FILES(CREATE);
	#undef CXACRU_DEVICE_CREATE_FILE

	/* start ADSL */
	mutex_lock(&instance->adsl_state_serialize);
	ret = cxacru_cm(instance, CM_REQUEST_CHIP_ADSL_LINE_START, NULL, 0, NULL, 0);
	if (ret < 0)
		atm_err(usbatm_instance, "cxacru_atm_start: CHIP_ADSL_LINE_START returned %d\n", ret);

	/* Start status polling */
	mutex_lock(&instance->poll_state_serialize);
	switch (instance->poll_state) {
	case CXPOLL_STOPPED:
		/* start polling */
		instance->poll_state = CXPOLL_POLLING;
		break;

	case CXPOLL_STOPPING:
		/* abort stop request */
		instance->poll_state = CXPOLL_POLLING;
	case CXPOLL_POLLING:
	case CXPOLL_SHUTDOWN:
		/* don't start polling */
		start_polling = 0;
	}
	mutex_unlock(&instance->poll_state_serialize);
	mutex_unlock(&instance->adsl_state_serialize);

	if (start_polling)
		cxacru_poll_status(&instance->poll_work.work);
	return 0;

fail_sysfs:
	usb_err(usbatm_instance, "cxacru_atm_start: device_create_file failed (%d)\n", ret);
	cxacru_remove_device_files(usbatm_instance, atm_dev);
	return ret;
}

static void cxacru_poll_status(struct work_struct *work)
{
	struct cxacru_data *instance =
		container_of(work, struct cxacru_data, poll_work.work);
	u32 buf[CXINF_MAX] = {};
	struct usbatm_data *usbatm = instance->usbatm;
	struct atm_dev *atm_dev = usbatm->atm_dev;
	int keep_polling = 1;
	int ret;

	ret = cxacru_cm_get_array(instance, CM_REQUEST_CARD_INFO_GET, buf, CXINF_MAX);
	if (ret < 0) {
		if (ret != -ESHUTDOWN)
			atm_warn(usbatm, "poll status: error %d\n", ret);

		mutex_lock(&instance->poll_state_serialize);
		if (instance->poll_state != CXPOLL_SHUTDOWN) {
			instance->poll_state = CXPOLL_STOPPED;

			if (ret != -ESHUTDOWN)
				atm_warn(usbatm, "polling disabled, set adsl_state"
						" to 'start' or 'poll' to resume\n");
		}
		mutex_unlock(&instance->poll_state_serialize);
		goto reschedule;
	}

	memcpy(instance->card_info, buf, sizeof(instance->card_info));

	if (instance->adsl_status != buf[CXINF_LINE_STARTABLE]) {
		instance->adsl_status = buf[CXINF_LINE_STARTABLE];

		switch (instance->adsl_status) {
		case 0:
			atm_printk(KERN_INFO, usbatm, "ADSL state: running\n");
			break;

		case 1:
			atm_printk(KERN_INFO, usbatm, "ADSL state: stopped\n");
			break;

		default:
			atm_printk(KERN_INFO, usbatm, "Unknown adsl status %02x\n", instance->adsl_status);
			break;
		}
	}

	if (instance->line_status == buf[CXINF_LINE_STATUS])
		goto reschedule;

	instance->line_status = buf[CXINF_LINE_STATUS];
	switch (instance->line_status) {
	case 0:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: down\n");
		break;

	case 1:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: attempting to activate\n");
		break;

	case 2:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: training\n");
		break;

	case 3:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: channel analysis\n");
		break;

	case 4:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: exchange\n");
		break;

	case 5:
		atm_dev->link_rate = buf[CXINF_DOWNSTREAM_RATE] * 1000 / 424;
		atm_dev->signal = ATM_PHY_SIG_FOUND;

		atm_info(usbatm, "ADSL line: up (%d kb/s down | %d kb/s up)\n",
		     buf[CXINF_DOWNSTREAM_RATE], buf[CXINF_UPSTREAM_RATE]);
		break;

	case 6:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: waiting\n");
		break;

	case 7:
		atm_dev->signal = ATM_PHY_SIG_LOST;
		atm_info(usbatm, "ADSL line: initializing\n");
		break;

	default:
		atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
		atm_info(usbatm, "Unknown line state %02x\n", instance->line_status);
		break;
	}
reschedule:

	mutex_lock(&instance->poll_state_serialize);
	if (instance->poll_state == CXPOLL_STOPPING &&
				instance->adsl_status == 1 && /* stopped */
				instance->line_status == 0) /* down */
		instance->poll_state = CXPOLL_STOPPED;

	if (instance->poll_state == CXPOLL_STOPPED)
		keep_polling = 0;
	mutex_unlock(&instance->poll_state_serialize);

	if (keep_polling)
		schedule_delayed_work(&instance->poll_work,
				round_jiffies_relative(POLL_INTERVAL*HZ));
}

static int cxacru_fw(struct usb_device *usb_dev, enum cxacru_fw_request fw,
		     u8 code1, u8 code2, u32 addr, const u8 *data, int size)
{
	int ret;
	u8 *buf;
	int offd, offb;
	const int stride = CMD_PACKET_SIZE - 8;

	buf = (u8 *) __get_free_page(GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	offb = offd = 0;
	do {
		int l = min_t(int, stride, size - offd);
		buf[offb++] = fw;
		buf[offb++] = l;
		buf[offb++] = code1;
		buf[offb++] = code2;
		put_unaligned(cpu_to_le32(addr), (__le32 *)(buf + offb));
		offb += 4;
		addr += l;
		if(l)
			memcpy(buf + offb, data + offd, l);
		if (l < stride)
			memset(buf + offb + l, 0, stride - l);
		offb += stride;
		offd += stride;
		if ((offb >= PAGE_SIZE) || (offd >= size)) {
			ret = usb_bulk_msg(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_CMD),
					   buf, offb, NULL, CMD_TIMEOUT);
			if (ret < 0) {
				dbg("sending fw %#x failed", fw);
				goto cleanup;
			}
			offb = 0;
		}
	} while(offd < size);
	dbg("sent fw %#x", fw);

	ret = 0;

cleanup:
	free_page((unsigned long) buf);
	return ret;
}

static void cxacru_upload_firmware(struct cxacru_data *instance,
				   const struct firmware *fw,
				   const struct firmware *bp,
				   const struct firmware *cf)
{
	int ret;
	int off;
	struct usbatm_data *usbatm = instance->usbatm;
	struct usb_device *usb_dev = usbatm->usb_dev;
	__le16 signature[] = { usb_dev->descriptor.idVendor,
			       usb_dev->descriptor.idProduct };
	__le32 val;

	dbg("cxacru_upload_firmware");

	/* FirmwarePllFClkValue */
	val = cpu_to_le32(instance->modem_type->pll_f_clk);
	ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, PLLFCLK_ADDR, (u8 *) &val, 4);
	if (ret) {
		usb_err(usbatm, "FirmwarePllFClkValue failed: %d\n", ret);
		return;
	}

	/* FirmwarePllBClkValue */
	val = cpu_to_le32(instance->modem_type->pll_b_clk);
	ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, PLLBCLK_ADDR, (u8 *) &val, 4);
	if (ret) {
		usb_err(usbatm, "FirmwarePllBClkValue failed: %d\n", ret);
		return;
	}

	/* Enable SDRAM */
	val = cpu_to_le32(SDRAM_ENA);
	ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, SDRAMEN_ADDR, (u8 *) &val, 4);
	if (ret) {
		usb_err(usbatm, "Enable SDRAM failed: %d\n", ret);
		return;
	}

	/* Firmware */
	ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, FW_ADDR, fw->data, fw->size);
	if (ret) {
		usb_err(usbatm, "Firmware upload failed: %d\n", ret);
		return;
	}

	/* Boot ROM patch */
	if (instance->modem_type->boot_rom_patch) {
		ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, BR_ADDR, bp->data, bp->size);
		if (ret) {
			usb_err(usbatm, "Boot ROM patching failed: %d\n", ret);
			return;
		}
	}

	/* Signature */
	ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, SIG_ADDR, (u8 *) signature, 4);
	if (ret) {
		usb_err(usbatm, "Signature storing failed: %d\n", ret);
		return;
	}

	if (instance->modem_type->boot_rom_patch) {
		val = cpu_to_le32(BR_ADDR);
		ret = cxacru_fw(usb_dev, FW_WRITE_MEM, 0x2, 0x0, BR_STACK_ADDR, (u8 *) &val, 4);
	}
	else {
		ret = cxacru_fw(usb_dev, FW_GOTO_MEM, 0x0, 0x0, FW_ADDR, NULL, 0);
	}
	if (ret) {
		usb_err(usbatm, "Passing control to firmware failed: %d\n", ret);
		return;
	}

	/* Delay to allow firmware to start up. */
	msleep_interruptible(1000);

	usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_CMD));
	usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, CXACRU_EP_CMD));
	usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, CXACRU_EP_DATA));
	usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, CXACRU_EP_DATA));

	ret = cxacru_cm(instance, CM_REQUEST_CARD_GET_STATUS, NULL, 0, NULL, 0);
	if (ret < 0) {
		usb_err(usbatm, "modem failed to initialize: %d\n", ret);
		return;
	}

	/* Load config data (le32), doing one packet at a time */
	if (cf)
		for (off = 0; off < cf->size / 4; ) {
			__le32 buf[CMD_PACKET_SIZE / 4 - 1];
			int i, len = min_t(int, cf->size / 4 - off, CMD_PACKET_SIZE / 4 / 2 - 1);
			buf[0] = cpu_to_le32(len);
			for (i = 0; i < len; i++, off++) {
				buf[i * 2 + 1] = cpu_to_le32(off);
				memcpy(buf + i * 2 + 2, cf->data + off * 4, 4);
			}
			ret = cxacru_cm(instance, CM_REQUEST_CARD_DATA_SET,
					(u8 *) buf, len, NULL, 0);
			if (ret < 0) {
				usb_err(usbatm, "load config data failed: %d\n", ret);
				return;
			}
		}

	msleep_interruptible(4000);
}

static int cxacru_find_firmware(struct cxacru_data *instance,
				char* phase, const struct firmware **fw_p)
{
	struct usbatm_data *usbatm = instance->usbatm;
	struct device *dev = &usbatm->usb_intf->dev;
	char buf[16];

	sprintf(buf, "cxacru-%s.bin", phase);
	dbg("cxacru_find_firmware: looking for %s", buf);

	if (request_firmware(fw_p, buf, dev)) {
		usb_dbg(usbatm, "no stage %s firmware found\n", phase);
		return -ENOENT;
	}

	usb_info(usbatm, "found firmware %s\n", buf);

	return 0;
}

static int cxacru_heavy_init(struct usbatm_data *usbatm_instance,
			     struct usb_interface *usb_intf)
{
	const struct firmware *fw, *bp, *cf;
	struct cxacru_data *instance = usbatm_instance->driver_data;

	int ret = cxacru_find_firmware(instance, "fw", &fw);
	if (ret) {
		usb_warn(usbatm_instance, "firmware (cxacru-fw.bin) unavailable (system misconfigured?)\n");
		return ret;
	}

	if (instance->modem_type->boot_rom_patch) {
		ret = cxacru_find_firmware(instance, "bp", &bp);
		if (ret) {
			usb_warn(usbatm_instance, "boot ROM patch (cxacru-bp.bin) unavailable (system misconfigured?)\n");
			release_firmware(fw);
			return ret;
		}
	}

	if (cxacru_find_firmware(instance, "cf", &cf))		/* optional */
		cf = NULL;

	cxacru_upload_firmware(instance, fw, bp, cf);

	if (cf)
		release_firmware(cf);
	if (instance->modem_type->boot_rom_patch)
		release_firmware(bp);
	release_firmware(fw);

	ret = cxacru_card_status(instance);
	if (ret)
		dbg("modem initialisation failed");
	else
		dbg("done setting up the modem");

	return ret;
}

static int cxacru_bind(struct usbatm_data *usbatm_instance,
		       struct usb_interface *intf, const struct usb_device_id *id)
{
	struct cxacru_data *instance;
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	int ret;

	/* instance init */
	instance = kzalloc(sizeof(*instance), GFP_KERNEL);
	if (!instance) {
		dbg("cxacru_bind: no memory for instance data");
		return -ENOMEM;
	}

	instance->usbatm = usbatm_instance;
	instance->modem_type = (struct cxacru_modem_type *) id->driver_info;

	mutex_init(&instance->poll_state_serialize);
	instance->poll_state = CXPOLL_STOPPED;
	instance->line_status = -1;
	instance->adsl_status = -1;

	mutex_init(&instance->adsl_state_serialize);

	instance->rcv_buf = (u8 *) __get_free_page(GFP_KERNEL);
	if (!instance->rcv_buf) {
		dbg("cxacru_bind: no memory for rcv_buf");
		ret = -ENOMEM;
		goto fail;
	}
	instance->snd_buf = (u8 *) __get_free_page(GFP_KERNEL);
	if (!instance->snd_buf) {
		dbg("cxacru_bind: no memory for snd_buf");
		ret = -ENOMEM;
		goto fail;
	}
	instance->rcv_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!instance->rcv_urb) {
		dbg("cxacru_bind: no memory for rcv_urb");
		ret = -ENOMEM;
		goto fail;
	}
	instance->snd_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!instance->snd_urb) {
		dbg("cxacru_bind: no memory for snd_urb");
		ret = -ENOMEM;
		goto fail;
	}

	usb_fill_int_urb(instance->rcv_urb,
			usb_dev, usb_rcvintpipe(usb_dev, CXACRU_EP_CMD),
			instance->rcv_buf, PAGE_SIZE,
			cxacru_blocking_completion, &instance->rcv_done, 1);

	usb_fill_int_urb(instance->snd_urb,
			usb_dev, usb_sndintpipe(usb_dev, CXACRU_EP_CMD),
			instance->snd_buf, PAGE_SIZE,
			cxacru_blocking_completion, &instance->snd_done, 4);

	mutex_init(&instance->cm_serialize);

	INIT_DELAYED_WORK(&instance->poll_work, cxacru_poll_status);

	usbatm_instance->driver_data = instance;

	usbatm_instance->flags = (cxacru_card_status(instance) ? 0 : UDSL_SKIP_HEAVY_INIT);

	return 0;

 fail:
	free_page((unsigned long) instance->snd_buf);
	free_page((unsigned long) instance->rcv_buf);
	usb_free_urb(instance->snd_urb);
	usb_free_urb(instance->rcv_urb);
	kfree(instance);

	return ret;
}

static void cxacru_unbind(struct usbatm_data *usbatm_instance,
		struct usb_interface *intf)
{
	struct cxacru_data *instance = usbatm_instance->driver_data;
	int is_polling = 1;

	dbg("cxacru_unbind entered");

	if (!instance) {
		dbg("cxacru_unbind: NULL instance!");
		return;
	}

	mutex_lock(&instance->poll_state_serialize);
	BUG_ON(instance->poll_state == CXPOLL_SHUTDOWN);

	/* ensure that status polling continues unless
	 * it has already stopped */
	if (instance->poll_state == CXPOLL_STOPPED)
		is_polling = 0;

	/* stop polling from being stopped or started */
	instance->poll_state = CXPOLL_SHUTDOWN;
	mutex_unlock(&instance->poll_state_serialize);

	if (is_polling)
		cancel_rearming_delayed_work(&instance->poll_work);

	usb_kill_urb(instance->snd_urb);
	usb_kill_urb(instance->rcv_urb);
	usb_free_urb(instance->snd_urb);
	usb_free_urb(instance->rcv_urb);

	free_page((unsigned long) instance->snd_buf);
	free_page((unsigned long) instance->rcv_buf);

	kfree(instance);

	usbatm_instance->driver_data = NULL;
}

static const struct cxacru_modem_type cxacru_cafe = {
	.pll_f_clk = 0x02d874df,
	.pll_b_clk = 0x0196a51a,
	.boot_rom_patch = 1,
};

static const struct cxacru_modem_type cxacru_cb00 = {
	.pll_f_clk = 0x5,
	.pll_b_clk = 0x3,
	.boot_rom_patch = 0,
};

static const struct usb_device_id cxacru_usb_ids[] = {
	{ /* V = Conexant			P = ADSL modem (Euphrates project)	*/
		USB_DEVICE(0x0572, 0xcafe),	.driver_info = (unsigned long) &cxacru_cafe
	},
	{ /* V = Conexant			P = ADSL modem (Hasbani project)	*/
		USB_DEVICE(0x0572, 0xcb00),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Conexant			P = ADSL modem				*/
		USB_DEVICE(0x0572, 0xcb01),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Conexant			P = ADSL modem (Well PTI-800) */
		USB_DEVICE(0x0572, 0xcb02),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Conexant			P = ADSL modem				*/
		USB_DEVICE(0x0572, 0xcb06),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Conexant			P = ADSL modem (ZTE ZXDSL 852)		*/
		USB_DEVICE(0x0572, 0xcb07),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Olitec				P = ADSL modem version 2		*/
		USB_DEVICE(0x08e3, 0x0100),	.driver_info = (unsigned long) &cxacru_cafe
	},
	{ /* V = Olitec				P = ADSL modem version 3		*/
		USB_DEVICE(0x08e3, 0x0102),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Trust/Amigo Technology Co.	P = AMX-CA86U				*/
		USB_DEVICE(0x0eb0, 0x3457),	.driver_info = (unsigned long) &cxacru_cafe
	},
	{ /* V = Zoom				P = 5510				*/
		USB_DEVICE(0x1803, 0x5510),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Draytek			P = Vigor 318				*/
		USB_DEVICE(0x0675, 0x0200),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Zyxel				P = 630-C1 aka OMNI ADSL USB (Annex A)	*/
		USB_DEVICE(0x0586, 0x330a),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Zyxel				P = 630-C3 aka OMNI ADSL USB (Annex B)	*/
		USB_DEVICE(0x0586, 0x330b),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Aethra				P = Starmodem UM1020			*/
		USB_DEVICE(0x0659, 0x0020),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Aztech Systems			P = ? AKA Pirelli AUA-010		*/
		USB_DEVICE(0x0509, 0x0812),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Netopia			P = Cayman 3341(Annex A)/3351(Annex B)	*/
		USB_DEVICE(0x100d, 0xcb01),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{ /* V = Netopia			P = Cayman 3342(Annex A)/3352(Annex B)	*/
		USB_DEVICE(0x100d, 0x3342),	.driver_info = (unsigned long) &cxacru_cb00
	},
	{}
};

MODULE_DEVICE_TABLE(usb, cxacru_usb_ids);

static struct usbatm_driver cxacru_driver = {
	.driver_name	= cxacru_driver_name,
	.bind		= cxacru_bind,
	.heavy_init	= cxacru_heavy_init,
	.unbind		= cxacru_unbind,
	.atm_start	= cxacru_atm_start,
	.atm_stop	= cxacru_remove_device_files,
	.bulk_in	= CXACRU_EP_DATA,
	.bulk_out	= CXACRU_EP_DATA,
	.rx_padding	= 3,
	.tx_padding	= 11,
};

static int cxacru_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	return usbatm_usb_probe(intf, id, &cxacru_driver);
}

static struct usb_driver cxacru_usb_driver = {
	.name		= cxacru_driver_name,
	.probe		= cxacru_usb_probe,
	.disconnect	= usbatm_usb_disconnect,
	.id_table	= cxacru_usb_ids
};

static int __init cxacru_init(void)
{
	return usb_register(&cxacru_usb_driver);
}

static void __exit cxacru_cleanup(void)
{
	usb_deregister(&cxacru_usb_driver);
}

module_init(cxacru_init);
module_exit(cxacru_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);