summaryrefslogtreecommitdiff
path: root/drivers/net/phy/sfp.c
blob: fd8bb998ae52d946ca5b29172a4553176addc726 (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
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include "mdio-i2c.h"
#include "sfp.h"
#include "swphy.h"

enum {
	GPIO_MODDEF0,
	GPIO_LOS,
	GPIO_TX_FAULT,
	GPIO_TX_DISABLE,
	GPIO_RATE_SELECT,
	GPIO_MAX,

	SFP_F_PRESENT = BIT(GPIO_MODDEF0),
	SFP_F_LOS = BIT(GPIO_LOS),
	SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
	SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
	SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),

	SFP_E_INSERT = 0,
	SFP_E_REMOVE,
	SFP_E_DEV_DOWN,
	SFP_E_DEV_UP,
	SFP_E_TX_FAULT,
	SFP_E_TX_CLEAR,
	SFP_E_LOS_HIGH,
	SFP_E_LOS_LOW,
	SFP_E_TIMEOUT,

	SFP_MOD_EMPTY = 0,
	SFP_MOD_PROBE,
	SFP_MOD_HPOWER,
	SFP_MOD_PRESENT,
	SFP_MOD_ERROR,

	SFP_DEV_DOWN = 0,
	SFP_DEV_UP,

	SFP_S_DOWN = 0,
	SFP_S_INIT,
	SFP_S_WAIT_LOS,
	SFP_S_LINK_UP,
	SFP_S_TX_FAULT,
	SFP_S_REINIT,
	SFP_S_TX_DISABLE,
};

static const char  * const mod_state_strings[] = {
	[SFP_MOD_EMPTY] = "empty",
	[SFP_MOD_PROBE] = "probe",
	[SFP_MOD_HPOWER] = "hpower",
	[SFP_MOD_PRESENT] = "present",
	[SFP_MOD_ERROR] = "error",
};

static const char *mod_state_to_str(unsigned short mod_state)
{
	if (mod_state >= ARRAY_SIZE(mod_state_strings))
		return "Unknown module state";
	return mod_state_strings[mod_state];
}

static const char * const dev_state_strings[] = {
	[SFP_DEV_DOWN] = "down",
	[SFP_DEV_UP] = "up",
};

static const char *dev_state_to_str(unsigned short dev_state)
{
	if (dev_state >= ARRAY_SIZE(dev_state_strings))
		return "Unknown device state";
	return dev_state_strings[dev_state];
}

static const char * const event_strings[] = {
	[SFP_E_INSERT] = "insert",
	[SFP_E_REMOVE] = "remove",
	[SFP_E_DEV_DOWN] = "dev_down",
	[SFP_E_DEV_UP] = "dev_up",
	[SFP_E_TX_FAULT] = "tx_fault",
	[SFP_E_TX_CLEAR] = "tx_clear",
	[SFP_E_LOS_HIGH] = "los_high",
	[SFP_E_LOS_LOW] = "los_low",
	[SFP_E_TIMEOUT] = "timeout",
};

static const char *event_to_str(unsigned short event)
{
	if (event >= ARRAY_SIZE(event_strings))
		return "Unknown event";
	return event_strings[event];
}

static const char * const sm_state_strings[] = {
	[SFP_S_DOWN] = "down",
	[SFP_S_INIT] = "init",
	[SFP_S_WAIT_LOS] = "wait_los",
	[SFP_S_LINK_UP] = "link_up",
	[SFP_S_TX_FAULT] = "tx_fault",
	[SFP_S_REINIT] = "reinit",
	[SFP_S_TX_DISABLE] = "rx_disable",
};

static const char *sm_state_to_str(unsigned short sm_state)
{
	if (sm_state >= ARRAY_SIZE(sm_state_strings))
		return "Unknown state";
	return sm_state_strings[sm_state];
}

static const char *gpio_of_names[] = {
	"mod-def0",
	"los",
	"tx-fault",
	"tx-disable",
	"rate-select0",
};

static const enum gpiod_flags gpio_flags[] = {
	GPIOD_IN,
	GPIOD_IN,
	GPIOD_IN,
	GPIOD_ASIS,
	GPIOD_ASIS,
};

#define T_INIT_JIFFIES	msecs_to_jiffies(300)
#define T_RESET_US	10
#define T_FAULT_RECOVER	msecs_to_jiffies(1000)

/* SFP module presence detection is poor: the three MOD DEF signals are
 * the same length on the PCB, which means it's possible for MOD DEF 0 to
 * connect before the I2C bus on MOD DEF 1/2.
 *
 * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
 * be deasserted) but makes no mention of the earliest time before we can
 * access the I2C EEPROM.  However, Avago modules require 300ms.
 */
#define T_PROBE_INIT	msecs_to_jiffies(300)
#define T_HPOWER_LEVEL	msecs_to_jiffies(300)
#define T_PROBE_RETRY	msecs_to_jiffies(100)

/* SFP modules appear to always have their PHY configured for bus address
 * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 */
#define SFP_PHY_ADDR	22

/* Give this long for the PHY to reset. */
#define T_PHY_RESET_MS	50

struct sff_data {
	unsigned int gpios;
	bool (*module_supported)(const struct sfp_eeprom_id *id);
};

struct sfp {
	struct device *dev;
	struct i2c_adapter *i2c;
	struct mii_bus *i2c_mii;
	struct sfp_bus *sfp_bus;
	struct phy_device *mod_phy;
	const struct sff_data *type;
	u32 max_power_mW;

	unsigned int (*get_state)(struct sfp *);
	void (*set_state)(struct sfp *, unsigned int);
	int (*read)(struct sfp *, bool, u8, void *, size_t);
	int (*write)(struct sfp *, bool, u8, void *, size_t);

	struct gpio_desc *gpio[GPIO_MAX];

	unsigned int state;
	struct delayed_work poll;
	struct delayed_work timeout;
	struct mutex sm_mutex;
	unsigned char sm_mod_state;
	unsigned char sm_dev_state;
	unsigned short sm_state;
	unsigned int sm_retries;

	struct sfp_eeprom_id id;
#if IS_ENABLED(CONFIG_HWMON)
	struct sfp_diag diag;
	struct device *hwmon_dev;
	char *hwmon_name;
#endif

};

static bool sff_module_supported(const struct sfp_eeprom_id *id)
{
	return id->base.phys_id == SFP_PHYS_ID_SFF &&
	       id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
}

static const struct sff_data sff_data = {
	.gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
	.module_supported = sff_module_supported,
};

static bool sfp_module_supported(const struct sfp_eeprom_id *id)
{
	return id->base.phys_id == SFP_PHYS_ID_SFP &&
	       id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
}

static const struct sff_data sfp_data = {
	.gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
		 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
	.module_supported = sfp_module_supported,
};

static const struct of_device_id sfp_of_match[] = {
	{ .compatible = "sff,sff", .data = &sff_data, },
	{ .compatible = "sff,sfp", .data = &sfp_data, },
	{ },
};
MODULE_DEVICE_TABLE(of, sfp_of_match);

static unsigned long poll_jiffies;

static unsigned int sfp_gpio_get_state(struct sfp *sfp)
{
	unsigned int i, state, v;

	for (i = state = 0; i < GPIO_MAX; i++) {
		if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
			continue;

		v = gpiod_get_value_cansleep(sfp->gpio[i]);
		if (v)
			state |= BIT(i);
	}

	return state;
}

static unsigned int sff_gpio_get_state(struct sfp *sfp)
{
	return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
}

static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
{
	if (state & SFP_F_PRESENT) {
		/* If the module is present, drive the signals */
		if (sfp->gpio[GPIO_TX_DISABLE])
			gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
					       state & SFP_F_TX_DISABLE);
		if (state & SFP_F_RATE_SELECT)
			gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
					       state & SFP_F_RATE_SELECT);
	} else {
		/* Otherwise, let them float to the pull-ups */
		if (sfp->gpio[GPIO_TX_DISABLE])
			gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
		if (state & SFP_F_RATE_SELECT)
			gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
	}
}

static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
			size_t len)
{
	struct i2c_msg msgs[2];
	u8 bus_addr = a2 ? 0x51 : 0x50;
	int ret;

	msgs[0].addr = bus_addr;
	msgs[0].flags = 0;
	msgs[0].len = 1;
	msgs[0].buf = &dev_addr;
	msgs[1].addr = bus_addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = len;
	msgs[1].buf = buf;

	ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
	if (ret < 0)
		return ret;

	return ret == ARRAY_SIZE(msgs) ? len : 0;
}

static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
	size_t len)
{
	struct i2c_msg msgs[1];
	u8 bus_addr = a2 ? 0x51 : 0x50;
	int ret;

	msgs[0].addr = bus_addr;
	msgs[0].flags = 0;
	msgs[0].len = 1 + len;
	msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
	if (!msgs[0].buf)
		return -ENOMEM;

	msgs[0].buf[0] = dev_addr;
	memcpy(&msgs[0].buf[1], buf, len);

	ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));

	kfree(msgs[0].buf);

	if (ret < 0)
		return ret;

	return ret == ARRAY_SIZE(msgs) ? len : 0;
}

static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
{
	struct mii_bus *i2c_mii;
	int ret;

	if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
		return -EINVAL;

	sfp->i2c = i2c;
	sfp->read = sfp_i2c_read;
	sfp->write = sfp_i2c_write;

	i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
	if (IS_ERR(i2c_mii))
		return PTR_ERR(i2c_mii);

	i2c_mii->name = "SFP I2C Bus";
	i2c_mii->phy_mask = ~0;

	ret = mdiobus_register(i2c_mii);
	if (ret < 0) {
		mdiobus_free(i2c_mii);
		return ret;
	}

	sfp->i2c_mii = i2c_mii;

	return 0;
}

/* Interface */
static unsigned int sfp_get_state(struct sfp *sfp)
{
	return sfp->get_state(sfp);
}

static void sfp_set_state(struct sfp *sfp, unsigned int state)
{
	sfp->set_state(sfp, state);
}

static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
{
	return sfp->read(sfp, a2, addr, buf, len);
}

static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
{
	return sfp->write(sfp, a2, addr, buf, len);
}

static unsigned int sfp_check(void *buf, size_t len)
{
	u8 *p, check;

	for (p = buf, check = 0; len; p++, len--)
		check += *p;

	return check;
}

/* hwmon */
#if IS_ENABLED(CONFIG_HWMON)
static umode_t sfp_hwmon_is_visible(const void *data,
				    enum hwmon_sensor_types type,
				    u32 attr, int channel)
{
	const struct sfp *sfp = data;

	switch (type) {
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_min_alarm:
		case hwmon_temp_max_alarm:
		case hwmon_temp_lcrit_alarm:
		case hwmon_temp_crit_alarm:
		case hwmon_temp_min:
		case hwmon_temp_max:
		case hwmon_temp_lcrit:
		case hwmon_temp_crit:
			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
				return 0;
			/* fall through */
		case hwmon_temp_input:
			return 0444;
		default:
			return 0;
		}
	case hwmon_in:
		switch (attr) {
		case hwmon_in_min_alarm:
		case hwmon_in_max_alarm:
		case hwmon_in_lcrit_alarm:
		case hwmon_in_crit_alarm:
		case hwmon_in_min:
		case hwmon_in_max:
		case hwmon_in_lcrit:
		case hwmon_in_crit:
			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
				return 0;
			/* fall through */
		case hwmon_in_input:
			return 0444;
		default:
			return 0;
		}
	case hwmon_curr:
		switch (attr) {
		case hwmon_curr_min_alarm:
		case hwmon_curr_max_alarm:
		case hwmon_curr_lcrit_alarm:
		case hwmon_curr_crit_alarm:
		case hwmon_curr_min:
		case hwmon_curr_max:
		case hwmon_curr_lcrit:
		case hwmon_curr_crit:
			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
				return 0;
			/* fall through */
		case hwmon_curr_input:
			return 0444;
		default:
			return 0;
		}
	case hwmon_power:
		/* External calibration of receive power requires
		 * floating point arithmetic. Doing that in the kernel
		 * is not easy, so just skip it. If the module does
		 * not require external calibration, we can however
		 * show receiver power, since FP is then not needed.
		 */
		if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
		    channel == 1)
			return 0;
		switch (attr) {
		case hwmon_power_min_alarm:
		case hwmon_power_max_alarm:
		case hwmon_power_lcrit_alarm:
		case hwmon_power_crit_alarm:
		case hwmon_power_min:
		case hwmon_power_max:
		case hwmon_power_lcrit:
		case hwmon_power_crit:
			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
				return 0;
			/* fall through */
		case hwmon_power_input:
			return 0444;
		default:
			return 0;
		}
	default:
		return 0;
	}
}

static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
{
	__be16 val;
	int err;

	err = sfp_read(sfp, true, reg, &val, sizeof(val));
	if (err < 0)
		return err;

	*value = be16_to_cpu(val);

	return 0;
}

static void sfp_hwmon_to_rx_power(long *value)
{
	*value = DIV_ROUND_CLOSEST(*value, 100);
}

static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
				long *value)
{
	if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
		*value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
}

static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
{
	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
			    be16_to_cpu(sfp->diag.cal_t_offset), value);

	if (*value >= 0x8000)
		*value -= 0x10000;

	*value = DIV_ROUND_CLOSEST(*value * 1000, 256);
}

static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
{
	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
			    be16_to_cpu(sfp->diag.cal_v_offset), value);

	*value = DIV_ROUND_CLOSEST(*value, 10);
}

static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
{
	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
			    be16_to_cpu(sfp->diag.cal_txi_offset), value);

	*value = DIV_ROUND_CLOSEST(*value, 500);
}

static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
{
	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
			    be16_to_cpu(sfp->diag.cal_txpwr_offset), value);

	*value = DIV_ROUND_CLOSEST(*value, 10);
}

static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
{
	int err;

	err = sfp_hwmon_read_sensor(sfp, reg, value);
	if (err < 0)
		return err;

	sfp_hwmon_calibrate_temp(sfp, value);

	return 0;
}

static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
{
	int err;

	err = sfp_hwmon_read_sensor(sfp, reg, value);
	if (err < 0)
		return err;

	sfp_hwmon_calibrate_vcc(sfp, value);

	return 0;
}

static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
{
	int err;

	err = sfp_hwmon_read_sensor(sfp, reg, value);
	if (err < 0)
		return err;

	sfp_hwmon_calibrate_bias(sfp, value);

	return 0;
}

static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
{
	int err;

	err = sfp_hwmon_read_sensor(sfp, reg, value);
	if (err < 0)
		return err;

	sfp_hwmon_calibrate_tx_power(sfp, value);

	return 0;
}

static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
{
	int err;

	err = sfp_hwmon_read_sensor(sfp, reg, value);
	if (err < 0)
		return err;

	sfp_hwmon_to_rx_power(value);

	return 0;
}

static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
{
	u8 status;
	int err;

	switch (attr) {
	case hwmon_temp_input:
		return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);

	case hwmon_temp_lcrit:
		*value = be16_to_cpu(sfp->diag.temp_low_alarm);
		sfp_hwmon_calibrate_temp(sfp, value);
		return 0;

	case hwmon_temp_min:
		*value = be16_to_cpu(sfp->diag.temp_low_warn);
		sfp_hwmon_calibrate_temp(sfp, value);
		return 0;
	case hwmon_temp_max:
		*value = be16_to_cpu(sfp->diag.temp_high_warn);
		sfp_hwmon_calibrate_temp(sfp, value);
		return 0;

	case hwmon_temp_crit:
		*value = be16_to_cpu(sfp->diag.temp_high_alarm);
		sfp_hwmon_calibrate_temp(sfp, value);
		return 0;

	case hwmon_temp_lcrit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TEMP_LOW);
		return 0;

	case hwmon_temp_min_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TEMP_LOW);
		return 0;

	case hwmon_temp_max_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TEMP_HIGH);
		return 0;

	case hwmon_temp_crit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TEMP_HIGH);
		return 0;
	default:
		return -EOPNOTSUPP;
	}

	return -EOPNOTSUPP;
}

static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
{
	u8 status;
	int err;

	switch (attr) {
	case hwmon_in_input:
		return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);

	case hwmon_in_lcrit:
		*value = be16_to_cpu(sfp->diag.volt_low_alarm);
		sfp_hwmon_calibrate_vcc(sfp, value);
		return 0;

	case hwmon_in_min:
		*value = be16_to_cpu(sfp->diag.volt_low_warn);
		sfp_hwmon_calibrate_vcc(sfp, value);
		return 0;

	case hwmon_in_max:
		*value = be16_to_cpu(sfp->diag.volt_high_warn);
		sfp_hwmon_calibrate_vcc(sfp, value);
		return 0;

	case hwmon_in_crit:
		*value = be16_to_cpu(sfp->diag.volt_high_alarm);
		sfp_hwmon_calibrate_vcc(sfp, value);
		return 0;

	case hwmon_in_lcrit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_VCC_LOW);
		return 0;

	case hwmon_in_min_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_VCC_LOW);
		return 0;

	case hwmon_in_max_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_VCC_HIGH);
		return 0;

	case hwmon_in_crit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_VCC_HIGH);
		return 0;
	default:
		return -EOPNOTSUPP;
	}

	return -EOPNOTSUPP;
}

static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
{
	u8 status;
	int err;

	switch (attr) {
	case hwmon_curr_input:
		return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);

	case hwmon_curr_lcrit:
		*value = be16_to_cpu(sfp->diag.bias_low_alarm);
		sfp_hwmon_calibrate_bias(sfp, value);
		return 0;

	case hwmon_curr_min:
		*value = be16_to_cpu(sfp->diag.bias_low_warn);
		sfp_hwmon_calibrate_bias(sfp, value);
		return 0;

	case hwmon_curr_max:
		*value = be16_to_cpu(sfp->diag.bias_high_warn);
		sfp_hwmon_calibrate_bias(sfp, value);
		return 0;

	case hwmon_curr_crit:
		*value = be16_to_cpu(sfp->diag.bias_high_alarm);
		sfp_hwmon_calibrate_bias(sfp, value);
		return 0;

	case hwmon_curr_lcrit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
		return 0;

	case hwmon_curr_min_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TX_BIAS_LOW);
		return 0;

	case hwmon_curr_max_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
		return 0;

	case hwmon_curr_crit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
		return 0;
	default:
		return -EOPNOTSUPP;
	}

	return -EOPNOTSUPP;
}

static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
{
	u8 status;
	int err;

	switch (attr) {
	case hwmon_power_input:
		return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);

	case hwmon_power_lcrit:
		*value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
		sfp_hwmon_calibrate_tx_power(sfp, value);
		return 0;

	case hwmon_power_min:
		*value = be16_to_cpu(sfp->diag.txpwr_low_warn);
		sfp_hwmon_calibrate_tx_power(sfp, value);
		return 0;

	case hwmon_power_max:
		*value = be16_to_cpu(sfp->diag.txpwr_high_warn);
		sfp_hwmon_calibrate_tx_power(sfp, value);
		return 0;

	case hwmon_power_crit:
		*value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
		sfp_hwmon_calibrate_tx_power(sfp, value);
		return 0;

	case hwmon_power_lcrit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TXPWR_LOW);
		return 0;

	case hwmon_power_min_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TXPWR_LOW);
		return 0;

	case hwmon_power_max_alarm:
		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN0_TXPWR_HIGH);
		return 0;

	case hwmon_power_crit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM0_TXPWR_HIGH);
		return 0;
	default:
		return -EOPNOTSUPP;
	}

	return -EOPNOTSUPP;
}

static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
{
	u8 status;
	int err;

	switch (attr) {
	case hwmon_power_input:
		return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);

	case hwmon_power_lcrit:
		*value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
		sfp_hwmon_to_rx_power(value);
		return 0;

	case hwmon_power_min:
		*value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
		sfp_hwmon_to_rx_power(value);
		return 0;

	case hwmon_power_max:
		*value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
		sfp_hwmon_to_rx_power(value);
		return 0;

	case hwmon_power_crit:
		*value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
		sfp_hwmon_to_rx_power(value);
		return 0;

	case hwmon_power_lcrit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM1_RXPWR_LOW);
		return 0;

	case hwmon_power_min_alarm:
		err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN1_RXPWR_LOW);
		return 0;

	case hwmon_power_max_alarm:
		err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_WARN1_RXPWR_HIGH);
		return 0;

	case hwmon_power_crit_alarm:
		err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
		if (err < 0)
			return err;

		*value = !!(status & SFP_ALARM1_RXPWR_HIGH);
		return 0;
	default:
		return -EOPNOTSUPP;
	}

	return -EOPNOTSUPP;
}

static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
			  u32 attr, int channel, long *value)
{
	struct sfp *sfp = dev_get_drvdata(dev);

	switch (type) {
	case hwmon_temp:
		return sfp_hwmon_temp(sfp, attr, value);
	case hwmon_in:
		return sfp_hwmon_vcc(sfp, attr, value);
	case hwmon_curr:
		return sfp_hwmon_bias(sfp, attr, value);
	case hwmon_power:
		switch (channel) {
		case 0:
			return sfp_hwmon_tx_power(sfp, attr, value);
		case 1:
			return sfp_hwmon_rx_power(sfp, attr, value);
		default:
			return -EOPNOTSUPP;
		}
	default:
		return -EOPNOTSUPP;
	}
}

static const struct hwmon_ops sfp_hwmon_ops = {
	.is_visible = sfp_hwmon_is_visible,
	.read = sfp_hwmon_read,
};

static u32 sfp_hwmon_chip_config[] = {
	HWMON_C_REGISTER_TZ,
	0,
};

static const struct hwmon_channel_info sfp_hwmon_chip = {
	.type = hwmon_chip,
	.config = sfp_hwmon_chip_config,
};

static u32 sfp_hwmon_temp_config[] = {
	HWMON_T_INPUT |
	HWMON_T_MAX | HWMON_T_MIN |
	HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
	HWMON_T_CRIT | HWMON_T_LCRIT |
	HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
	0,
};

static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
	.type = hwmon_temp,
	.config = sfp_hwmon_temp_config,
};

static u32 sfp_hwmon_vcc_config[] = {
	HWMON_I_INPUT |
	HWMON_I_MAX | HWMON_I_MIN |
	HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
	HWMON_I_CRIT | HWMON_I_LCRIT |
	HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
	0,
};

static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
	.type = hwmon_in,
	.config = sfp_hwmon_vcc_config,
};

static u32 sfp_hwmon_bias_config[] = {
	HWMON_C_INPUT |
	HWMON_C_MAX | HWMON_C_MIN |
	HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
	HWMON_C_CRIT | HWMON_C_LCRIT |
	HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
	0,
};

static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
	.type = hwmon_curr,
	.config = sfp_hwmon_bias_config,
};

static u32 sfp_hwmon_power_config[] = {
	/* Transmit power */
	HWMON_P_INPUT |
	HWMON_P_MAX | HWMON_P_MIN |
	HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
	HWMON_P_CRIT | HWMON_P_LCRIT |
	HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
	/* Receive power */
	HWMON_P_INPUT |
	HWMON_P_MAX | HWMON_P_MIN |
	HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
	HWMON_P_CRIT | HWMON_P_LCRIT |
	HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
	0,
};

static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
	.type = hwmon_power,
	.config = sfp_hwmon_power_config,
};

static const struct hwmon_channel_info *sfp_hwmon_info[] = {
	&sfp_hwmon_chip,
	&sfp_hwmon_vcc_channel_info,
	&sfp_hwmon_temp_channel_info,
	&sfp_hwmon_bias_channel_info,
	&sfp_hwmon_power_channel_info,
	NULL,
};

static const struct hwmon_chip_info sfp_hwmon_chip_info = {
	.ops = &sfp_hwmon_ops,
	.info = sfp_hwmon_info,
};

static int sfp_hwmon_insert(struct sfp *sfp)
{
	int err, i;

	if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
		return 0;

	if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
		return 0;

	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
		/* This driver in general does not support address
		 * change.
		 */
		return 0;

	err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
	if (err < 0)
		return err;

	sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
	if (!sfp->hwmon_name)
		return -ENODEV;

	for (i = 0; sfp->hwmon_name[i]; i++)
		if (hwmon_is_bad_char(sfp->hwmon_name[i]))
			sfp->hwmon_name[i] = '_';

	sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
							 sfp->hwmon_name, sfp,
							 &sfp_hwmon_chip_info,
							 NULL);

	return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
}

static void sfp_hwmon_remove(struct sfp *sfp)
{
	if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
		hwmon_device_unregister(sfp->hwmon_dev);
		sfp->hwmon_dev = NULL;
		kfree(sfp->hwmon_name);
	}
}
#else
static int sfp_hwmon_insert(struct sfp *sfp)
{
	return 0;
}

static void sfp_hwmon_remove(struct sfp *sfp)
{
}
#endif

/* Helpers */
static void sfp_module_tx_disable(struct sfp *sfp)
{
	dev_dbg(sfp->dev, "tx disable %u -> %u\n",
		sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
	sfp->state |= SFP_F_TX_DISABLE;
	sfp_set_state(sfp, sfp->state);
}

static void sfp_module_tx_enable(struct sfp *sfp)
{
	dev_dbg(sfp->dev, "tx disable %u -> %u\n",
		sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
	sfp->state &= ~SFP_F_TX_DISABLE;
	sfp_set_state(sfp, sfp->state);
}

static void sfp_module_tx_fault_reset(struct sfp *sfp)
{
	unsigned int state = sfp->state;

	if (state & SFP_F_TX_DISABLE)
		return;

	sfp_set_state(sfp, state | SFP_F_TX_DISABLE);

	udelay(T_RESET_US);

	sfp_set_state(sfp, state);
}

/* SFP state machine */
static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
{
	if (timeout)
		mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
				 timeout);
	else
		cancel_delayed_work(&sfp->timeout);
}

static void sfp_sm_next(struct sfp *sfp, unsigned int state,
			unsigned int timeout)
{
	sfp->sm_state = state;
	sfp_sm_set_timer(sfp, timeout);
}

static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
			    unsigned int timeout)
{
	sfp->sm_mod_state = state;
	sfp_sm_set_timer(sfp, timeout);
}

static void sfp_sm_phy_detach(struct sfp *sfp)
{
	phy_stop(sfp->mod_phy);
	sfp_remove_phy(sfp->sfp_bus);
	phy_device_remove(sfp->mod_phy);
	phy_device_free(sfp->mod_phy);
	sfp->mod_phy = NULL;
}

static void sfp_sm_probe_phy(struct sfp *sfp)
{
	struct phy_device *phy;
	int err;

	msleep(T_PHY_RESET_MS);

	phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
	if (phy == ERR_PTR(-ENODEV)) {
		dev_info(sfp->dev, "no PHY detected\n");
		return;
	}
	if (IS_ERR(phy)) {
		dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
		return;
	}

	err = sfp_add_phy(sfp->sfp_bus, phy);
	if (err) {
		phy_device_remove(phy);
		phy_device_free(phy);
		dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
		return;
	}

	sfp->mod_phy = phy;
	phy_start(phy);
}

static void sfp_sm_link_up(struct sfp *sfp)
{
	sfp_link_up(sfp->sfp_bus);
	sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
}

static void sfp_sm_link_down(struct sfp *sfp)
{
	sfp_link_down(sfp->sfp_bus);
}

static void sfp_sm_link_check_los(struct sfp *sfp)
{
	unsigned int los = sfp->state & SFP_F_LOS;

	/* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
	 * are set, we assume that no LOS signal is available.
	 */
	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
		los ^= SFP_F_LOS;
	else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
		los = 0;

	if (los)
		sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
	else
		sfp_sm_link_up(sfp);
}

static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
{
	return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
		event == SFP_E_LOS_LOW) ||
	       (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
		event == SFP_E_LOS_HIGH);
}

static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
{
	return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
		event == SFP_E_LOS_HIGH) ||
	       (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
		event == SFP_E_LOS_LOW);
}

static void sfp_sm_fault(struct sfp *sfp, bool warn)
{
	if (sfp->sm_retries && !--sfp->sm_retries) {
		dev_err(sfp->dev,
			"module persistently indicates fault, disabling\n");
		sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
	} else {
		if (warn)
			dev_err(sfp->dev, "module transmit fault indicated\n");

		sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
	}
}

static void sfp_sm_mod_init(struct sfp *sfp)
{
	sfp_module_tx_enable(sfp);

	/* Wait t_init before indicating that the link is up, provided the
	 * current state indicates no TX_FAULT.  If TX_FAULT clears before
	 * this time, that's fine too.
	 */
	sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
	sfp->sm_retries = 5;

	/* Setting the serdes link mode is guesswork: there's no
	 * field in the EEPROM which indicates what mode should
	 * be used.
	 *
	 * If it's a gigabit-only fiber module, it probably does
	 * not have a PHY, so switch to 802.3z negotiation mode.
	 * Otherwise, switch to SGMII mode (which is required to
	 * support non-gigabit speeds) and probe for a PHY.
	 */
	if (sfp->id.base.e1000_base_t ||
	    sfp->id.base.e100_base_lx ||
	    sfp->id.base.e100_base_fx)
		sfp_sm_probe_phy(sfp);
}

static int sfp_sm_mod_hpower(struct sfp *sfp)
{
	u32 power;
	u8 val;
	int err;

	power = 1000;
	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
		power = 1500;
	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
		power = 2000;

	if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
	    (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
	    SFP_DIAGMON_DDM) {
		/* The module appears not to implement bus address 0xa2,
		 * or requires an address change sequence, so assume that
		 * the module powers up in the indicated power mode.
		 */
		if (power > sfp->max_power_mW) {
			dev_err(sfp->dev,
				"Host does not support %u.%uW modules\n",
				power / 1000, (power / 100) % 10);
			return -EINVAL;
		}
		return 0;
	}

	if (power > sfp->max_power_mW) {
		dev_warn(sfp->dev,
			 "Host does not support %u.%uW modules, module left in power mode 1\n",
			 power / 1000, (power / 100) % 10);
		return 0;
	}

	if (power <= 1000)
		return 0;

	err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
	if (err != sizeof(val)) {
		dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
		err = -EAGAIN;
		goto err;
	}

	val |= BIT(0);

	err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
	if (err != sizeof(val)) {
		dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
		err = -EAGAIN;
		goto err;
	}

	dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
		 power / 1000, (power / 100) % 10);
	return T_HPOWER_LEVEL;

err:
	return err;
}

static int sfp_sm_mod_probe(struct sfp *sfp)
{
	/* SFP module inserted - read I2C data */
	struct sfp_eeprom_id id;
	bool cotsworks;
	u8 check;
	int ret;

	ret = sfp_read(sfp, false, 0, &id, sizeof(id));
	if (ret < 0) {
		dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
		return -EAGAIN;
	}

	if (ret != sizeof(id)) {
		dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
		return -EAGAIN;
	}

	/* Cotsworks do not seem to update the checksums when they
	 * do the final programming with the final module part number,
	 * serial number and date code.
	 */
	cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);

	/* Validate the checksum over the base structure */
	check = sfp_check(&id.base, sizeof(id.base) - 1);
	if (check != id.base.cc_base) {
		if (cotsworks) {
			dev_warn(sfp->dev,
				 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
				 check, id.base.cc_base);
		} else {
			dev_err(sfp->dev,
				"EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
				check, id.base.cc_base);
			print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
				       16, 1, &id, sizeof(id), true);
			return -EINVAL;
		}
	}

	check = sfp_check(&id.ext, sizeof(id.ext) - 1);
	if (check != id.ext.cc_ext) {
		if (cotsworks) {
			dev_warn(sfp->dev,
				 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
				 check, id.ext.cc_ext);
		} else {
			dev_err(sfp->dev,
				"EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
				check, id.ext.cc_ext);
			print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
				       16, 1, &id, sizeof(id), true);
			memset(&id.ext, 0, sizeof(id.ext));
		}
	}

	sfp->id = id;

	dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
		 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
		 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
		 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
		 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
		 (int)sizeof(id.ext.datecode), id.ext.datecode);

	/* Check whether we support this module */
	if (!sfp->type->module_supported(&sfp->id)) {
		dev_err(sfp->dev,
			"module is not supported - phys id 0x%02x 0x%02x\n",
			sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
		return -EINVAL;
	}

	/* If the module requires address swap mode, warn about it */
	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
		dev_warn(sfp->dev,
			 "module address swap to access page 0xA2 is not supported.\n");

	ret = sfp_hwmon_insert(sfp);
	if (ret < 0)
		return ret;

	ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
	if (ret < 0)
		return ret;

	return sfp_sm_mod_hpower(sfp);
}

static void sfp_sm_mod_remove(struct sfp *sfp)
{
	sfp_module_remove(sfp->sfp_bus);

	sfp_hwmon_remove(sfp);

	if (sfp->mod_phy)
		sfp_sm_phy_detach(sfp);

	sfp_module_tx_disable(sfp);

	memset(&sfp->id, 0, sizeof(sfp->id));

	dev_info(sfp->dev, "module removed\n");
}

static void sfp_sm_event(struct sfp *sfp, unsigned int event)
{
	mutex_lock(&sfp->sm_mutex);

	dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
		mod_state_to_str(sfp->sm_mod_state),
		dev_state_to_str(sfp->sm_dev_state),
		sm_state_to_str(sfp->sm_state),
		event_to_str(event));

	/* This state machine tracks the insert/remove state of
	 * the module, and handles probing the on-board EEPROM.
	 */
	switch (sfp->sm_mod_state) {
	default:
		if (event == SFP_E_INSERT) {
			sfp_module_tx_disable(sfp);
			sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
		}
		break;

	case SFP_MOD_PROBE:
		if (event == SFP_E_REMOVE) {
			sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
		} else if (event == SFP_E_TIMEOUT) {
			int val = sfp_sm_mod_probe(sfp);

			if (val == 0)
				sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
			else if (val > 0)
				sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
			else if (val != -EAGAIN)
				sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
			else
				sfp_sm_set_timer(sfp, T_PROBE_RETRY);
		}
		break;

	case SFP_MOD_HPOWER:
		if (event == SFP_E_TIMEOUT) {
			sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
			break;
		}
		/* fallthrough */
	case SFP_MOD_PRESENT:
	case SFP_MOD_ERROR:
		if (event == SFP_E_REMOVE) {
			sfp_sm_mod_remove(sfp);
			sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
		}
		break;
	}

	/* This state machine tracks the netdev up/down state */
	switch (sfp->sm_dev_state) {
	default:
		if (event == SFP_E_DEV_UP)
			sfp->sm_dev_state = SFP_DEV_UP;
		break;

	case SFP_DEV_UP:
		if (event == SFP_E_DEV_DOWN) {
			/* If the module has a PHY, avoid raising TX disable
			 * as this resets the PHY. Otherwise, raise it to
			 * turn the laser off.
			 */
			if (!sfp->mod_phy)
				sfp_module_tx_disable(sfp);
			sfp->sm_dev_state = SFP_DEV_DOWN;
		}
		break;
	}

	/* Some events are global */
	if (sfp->sm_state != SFP_S_DOWN &&
	    (sfp->sm_mod_state != SFP_MOD_PRESENT ||
	     sfp->sm_dev_state != SFP_DEV_UP)) {
		if (sfp->sm_state == SFP_S_LINK_UP &&
		    sfp->sm_dev_state == SFP_DEV_UP)
			sfp_sm_link_down(sfp);
		if (sfp->mod_phy)
			sfp_sm_phy_detach(sfp);
		sfp_sm_next(sfp, SFP_S_DOWN, 0);
		mutex_unlock(&sfp->sm_mutex);
		return;
	}

	/* The main state machine */
	switch (sfp->sm_state) {
	case SFP_S_DOWN:
		if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
		    sfp->sm_dev_state == SFP_DEV_UP)
			sfp_sm_mod_init(sfp);
		break;

	case SFP_S_INIT:
		if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
			sfp_sm_fault(sfp, true);
		else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
			sfp_sm_link_check_los(sfp);
		break;

	case SFP_S_WAIT_LOS:
		if (event == SFP_E_TX_FAULT)
			sfp_sm_fault(sfp, true);
		else if (sfp_los_event_inactive(sfp, event))
			sfp_sm_link_up(sfp);
		break;

	case SFP_S_LINK_UP:
		if (event == SFP_E_TX_FAULT) {
			sfp_sm_link_down(sfp);
			sfp_sm_fault(sfp, true);
		} else if (sfp_los_event_active(sfp, event)) {
			sfp_sm_link_down(sfp);
			sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
		}
		break;

	case SFP_S_TX_FAULT:
		if (event == SFP_E_TIMEOUT) {
			sfp_module_tx_fault_reset(sfp);
			sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
		}
		break;

	case SFP_S_REINIT:
		if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
			sfp_sm_fault(sfp, false);
		} else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
			dev_info(sfp->dev, "module transmit fault recovered\n");
			sfp_sm_link_check_los(sfp);
		}
		break;

	case SFP_S_TX_DISABLE:
		break;
	}

	dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
		mod_state_to_str(sfp->sm_mod_state),
		dev_state_to_str(sfp->sm_dev_state),
		sm_state_to_str(sfp->sm_state));

	mutex_unlock(&sfp->sm_mutex);
}

static void sfp_start(struct sfp *sfp)
{
	sfp_sm_event(sfp, SFP_E_DEV_UP);
}

static void sfp_stop(struct sfp *sfp)
{
	sfp_sm_event(sfp, SFP_E_DEV_DOWN);
}

static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
{
	/* locking... and check module is present */

	if (sfp->id.ext.sff8472_compliance &&
	    !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
		modinfo->type = ETH_MODULE_SFF_8472;
		modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
	} else {
		modinfo->type = ETH_MODULE_SFF_8079;
		modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
	}
	return 0;
}

static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
			     u8 *data)
{
	unsigned int first, last, len;
	int ret;

	if (ee->len == 0)
		return -EINVAL;

	first = ee->offset;
	last = ee->offset + ee->len;
	if (first < ETH_MODULE_SFF_8079_LEN) {
		len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
		len -= first;

		ret = sfp_read(sfp, false, first, data, len);
		if (ret < 0)
			return ret;

		first += len;
		data += len;
	}
	if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
		len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
		len -= first;
		first -= ETH_MODULE_SFF_8079_LEN;

		ret = sfp_read(sfp, true, first, data, len);
		if (ret < 0)
			return ret;
	}
	return 0;
}

static const struct sfp_socket_ops sfp_module_ops = {
	.start = sfp_start,
	.stop = sfp_stop,
	.module_info = sfp_module_info,
	.module_eeprom = sfp_module_eeprom,
};

static void sfp_timeout(struct work_struct *work)
{
	struct sfp *sfp = container_of(work, struct sfp, timeout.work);

	rtnl_lock();
	sfp_sm_event(sfp, SFP_E_TIMEOUT);
	rtnl_unlock();
}

static void sfp_check_state(struct sfp *sfp)
{
	unsigned int state, i, changed;

	state = sfp_get_state(sfp);
	changed = state ^ sfp->state;
	changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;

	for (i = 0; i < GPIO_MAX; i++)
		if (changed & BIT(i))
			dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
				!!(sfp->state & BIT(i)), !!(state & BIT(i)));

	state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
	sfp->state = state;

	rtnl_lock();
	if (changed & SFP_F_PRESENT)
		sfp_sm_event(sfp, state & SFP_F_PRESENT ?
				SFP_E_INSERT : SFP_E_REMOVE);

	if (changed & SFP_F_TX_FAULT)
		sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
				SFP_E_TX_FAULT : SFP_E_TX_CLEAR);

	if (changed & SFP_F_LOS)
		sfp_sm_event(sfp, state & SFP_F_LOS ?
				SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
	rtnl_unlock();
}

static irqreturn_t sfp_irq(int irq, void *data)
{
	struct sfp *sfp = data;

	sfp_check_state(sfp);

	return IRQ_HANDLED;
}

static void sfp_poll(struct work_struct *work)
{
	struct sfp *sfp = container_of(work, struct sfp, poll.work);

	sfp_check_state(sfp);
	mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
}

static struct sfp *sfp_alloc(struct device *dev)
{
	struct sfp *sfp;

	sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
	if (!sfp)
		return ERR_PTR(-ENOMEM);

	sfp->dev = dev;

	mutex_init(&sfp->sm_mutex);
	INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
	INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);

	return sfp;
}

static void sfp_cleanup(void *data)
{
	struct sfp *sfp = data;

	cancel_delayed_work_sync(&sfp->poll);
	cancel_delayed_work_sync(&sfp->timeout);
	if (sfp->i2c_mii) {
		mdiobus_unregister(sfp->i2c_mii);
		mdiobus_free(sfp->i2c_mii);
	}
	if (sfp->i2c)
		i2c_put_adapter(sfp->i2c);
	kfree(sfp);
}

static int sfp_probe(struct platform_device *pdev)
{
	const struct sff_data *sff;
	struct sfp *sfp;
	bool poll = false;
	int irq, err, i;

	sfp = sfp_alloc(&pdev->dev);
	if (IS_ERR(sfp))
		return PTR_ERR(sfp);

	platform_set_drvdata(pdev, sfp);

	err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
	if (err < 0)
		return err;

	sff = sfp->type = &sfp_data;

	if (pdev->dev.of_node) {
		struct device_node *node = pdev->dev.of_node;
		const struct of_device_id *id;
		struct i2c_adapter *i2c;
		struct device_node *np;

		id = of_match_node(sfp_of_match, node);
		if (WARN_ON(!id))
			return -EINVAL;

		sff = sfp->type = id->data;

		np = of_parse_phandle(node, "i2c-bus", 0);
		if (!np) {
			dev_err(sfp->dev, "missing 'i2c-bus' property\n");
			return -ENODEV;
		}

		i2c = of_find_i2c_adapter_by_node(np);
		of_node_put(np);
		if (!i2c)
			return -EPROBE_DEFER;

		err = sfp_i2c_configure(sfp, i2c);
		if (err < 0) {
			i2c_put_adapter(i2c);
			return err;
		}
	}

	for (i = 0; i < GPIO_MAX; i++)
		if (sff->gpios & BIT(i)) {
			sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
					   gpio_of_names[i], gpio_flags[i]);
			if (IS_ERR(sfp->gpio[i]))
				return PTR_ERR(sfp->gpio[i]);
		}

	sfp->get_state = sfp_gpio_get_state;
	sfp->set_state = sfp_gpio_set_state;

	/* Modules that have no detect signal are always present */
	if (!(sfp->gpio[GPIO_MODDEF0]))
		sfp->get_state = sff_gpio_get_state;

	device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
				 &sfp->max_power_mW);
	if (!sfp->max_power_mW)
		sfp->max_power_mW = 1000;

	dev_info(sfp->dev, "Host maximum power %u.%uW\n",
		 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);

	sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
	if (!sfp->sfp_bus)
		return -ENOMEM;

	/* Get the initial state, and always signal TX disable,
	 * since the network interface will not be up.
	 */
	sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;

	if (sfp->gpio[GPIO_RATE_SELECT] &&
	    gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
		sfp->state |= SFP_F_RATE_SELECT;
	sfp_set_state(sfp, sfp->state);
	sfp_module_tx_disable(sfp);
	rtnl_lock();
	if (sfp->state & SFP_F_PRESENT)
		sfp_sm_event(sfp, SFP_E_INSERT);
	rtnl_unlock();

	for (i = 0; i < GPIO_MAX; i++) {
		if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
			continue;

		irq = gpiod_to_irq(sfp->gpio[i]);
		if (!irq) {
			poll = true;
			continue;
		}

		err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
						IRQF_ONESHOT |
						IRQF_TRIGGER_RISING |
						IRQF_TRIGGER_FALLING,
						dev_name(sfp->dev), sfp);
		if (err)
			poll = true;
	}

	if (poll)
		mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);

	/* We could have an issue in cases no Tx disable pin is available or
	 * wired as modules using a laser as their light source will continue to
	 * be active when the fiber is removed. This could be a safety issue and
	 * we should at least warn the user about that.
	 */
	if (!sfp->gpio[GPIO_TX_DISABLE])
		dev_warn(sfp->dev,
			 "No tx_disable pin: SFP modules will always be emitting.\n");

	return 0;
}

static int sfp_remove(struct platform_device *pdev)
{
	struct sfp *sfp = platform_get_drvdata(pdev);

	sfp_unregister_socket(sfp->sfp_bus);

	return 0;
}

static struct platform_driver sfp_driver = {
	.probe = sfp_probe,
	.remove = sfp_remove,
	.driver = {
		.name = "sfp",
		.of_match_table = sfp_of_match,
	},
};

static int sfp_init(void)
{
	poll_jiffies = msecs_to_jiffies(100);

	return platform_driver_register(&sfp_driver);
}
module_init(sfp_init);

static void sfp_exit(void)
{
	platform_driver_unregister(&sfp_driver);
}
module_exit(sfp_exit);

MODULE_ALIAS("platform:sfp");
MODULE_AUTHOR("Russell King");
MODULE_LICENSE("GPL v2");