Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
/*
 * Core driver for the pin control subsystem
 *
 * Copyright (C) 2011-2012 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 * Based on bits of regulator core, gpio core and clk core
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
 *
 * License terms: GNU General Public License (GPL) version 2
 */
#define pr_fmt(fmt) "pinctrl core: " fmt

#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/machine.h>

#ifdef CONFIG_GPIOLIB
#include <asm-generic/gpio.h>
#endif

#include "core.h"
#include "devicetree.h"
#include "pinmux.h"
#include "pinconf.h"


static bool pinctrl_dummy_state;

/* Mutex taken to protect pinctrl_list */
static DEFINE_MUTEX(pinctrl_list_mutex);

/* Mutex taken to protect pinctrl_maps */
DEFINE_MUTEX(pinctrl_maps_mutex);

/* Mutex taken to protect pinctrldev_list */
static DEFINE_MUTEX(pinctrldev_list_mutex);

/* Global list of pin control devices (struct pinctrl_dev) */
static LIST_HEAD(pinctrldev_list);

/* List of pin controller handles (struct pinctrl) */
static LIST_HEAD(pinctrl_list);

/* List of pinctrl maps (struct pinctrl_maps) */
LIST_HEAD(pinctrl_maps);


/**
 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
 *
 * Usually this function is called by platforms without pinctrl driver support
 * but run with some shared drivers using pinctrl APIs.
 * After calling this function, the pinctrl core will return successfully
 * with creating a dummy state for the driver to keep going smoothly.
 */
void pinctrl_provide_dummies(void)
{
	pinctrl_dummy_state = true;
}

const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
{
	/* We're not allowed to register devices without name */
	return pctldev->desc->name;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);

const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
{
	return dev_name(pctldev->dev);
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);

void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
{
	return pctldev->driver_data;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);

/**
 * get_pinctrl_dev_from_devname() - look up pin controller device
 * @devname: the name of a device instance, as returned by dev_name()
 *
 * Looks up a pin control device matching a certain device name or pure device
 * pointer, the pure device pointer will take precedence.
 */
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
{
	struct pinctrl_dev *pctldev = NULL;

	if (!devname)
		return NULL;

	mutex_lock(&pinctrldev_list_mutex);

	list_for_each_entry(pctldev, &pinctrldev_list, node) {
		if (!strcmp(dev_name(pctldev->dev), devname)) {
			/* Matched on device name */
			mutex_unlock(&pinctrldev_list_mutex);
			return pctldev;
		}
	}

	mutex_unlock(&pinctrldev_list_mutex);

	return NULL;
}

struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
{
	struct pinctrl_dev *pctldev;

	mutex_lock(&pinctrldev_list_mutex);

	list_for_each_entry(pctldev, &pinctrldev_list, node)
		if (pctldev->dev->of_node == np) {
			mutex_unlock(&pinctrldev_list_mutex);
			return pctldev;
		}

	mutex_unlock(&pinctrldev_list_mutex);

	return NULL;
}

/**
 * pin_get_from_name() - look up a pin number from a name
 * @pctldev: the pin control device to lookup the pin on
 * @name: the name of the pin to look up
 */
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
{
	unsigned i, pin;

	/* The pin number can be retrived from the pin controller descriptor */
	for (i = 0; i < pctldev->desc->npins; i++) {
		struct pin_desc *desc;

		pin = pctldev->desc->pins[i].number;
		desc = pin_desc_get(pctldev, pin);
		/* Pin space may be sparse */
		if (desc && !strcmp(name, desc->name))
			return pin;
	}

	return -EINVAL;
}

/**
 * pin_get_name_from_id() - look up a pin name from a pin id
 * @pctldev: the pin control device to lookup the pin on
 * @name: the name of the pin to look up
 */
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
{
	const struct pin_desc *desc;

	desc = pin_desc_get(pctldev, pin);
	if (desc == NULL) {
		dev_err(pctldev->dev, "failed to get pin(%d) name\n",
			pin);
		return NULL;
	}

	return desc->name;
}

/**
 * pin_is_valid() - check if pin exists on controller
 * @pctldev: the pin control device to check the pin on
 * @pin: pin to check, use the local pin controller index number
 *
 * This tells us whether a certain pin exist on a certain pin controller or
 * not. Pin lists may be sparse, so some pins may not exist.
 */
bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
{
	struct pin_desc *pindesc;

	if (pin < 0)
		return false;

	mutex_lock(&pctldev->mutex);
	pindesc = pin_desc_get(pctldev, pin);
	mutex_unlock(&pctldev->mutex);

	return pindesc != NULL;
}
EXPORT_SYMBOL_GPL(pin_is_valid);

/* Deletes a range of pin descriptors */
static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
				  const struct pinctrl_pin_desc *pins,
				  unsigned num_pins)
{
	int i;

	for (i = 0; i < num_pins; i++) {
		struct pin_desc *pindesc;

		pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
					    pins[i].number);
		if (pindesc != NULL) {
			radix_tree_delete(&pctldev->pin_desc_tree,
					  pins[i].number);
			if (pindesc->dynamic_name)
				kfree(pindesc->name);
		}
		kfree(pindesc);
	}
}

static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
				    unsigned number, const char *name)
{
	struct pin_desc *pindesc;

	pindesc = pin_desc_get(pctldev, number);
	if (pindesc != NULL) {
		dev_err(pctldev->dev, "pin %d already registered\n", number);
		return -EINVAL;
	}

	pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
	if (pindesc == NULL) {
		dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
		return -ENOMEM;
	}

	/* Set owner */
	pindesc->pctldev = pctldev;

	/* Copy basic pin info */
	if (name) {
		pindesc->name = name;
	} else {
		pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
		if (pindesc->name == NULL) {
			kfree(pindesc);
			return -ENOMEM;
		}
		pindesc->dynamic_name = true;
	}

	radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
	pr_debug("registered pin %d (%s) on %s\n",
		 number, pindesc->name, pctldev->desc->name);
	return 0;
}

static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
				 struct pinctrl_pin_desc const *pins,
				 unsigned num_descs)
{
	unsigned i;
	int ret = 0;

	for (i = 0; i < num_descs; i++) {
		ret = pinctrl_register_one_pin(pctldev,
					       pins[i].number, pins[i].name);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * gpio_to_pin() - GPIO range GPIO number to pin number translation
 * @range: GPIO range used for the translation
 * @gpio: gpio pin to translate to a pin number
 *
 * Finds the pin number for a given GPIO using the specified GPIO range
 * as a base for translation. The distinction between linear GPIO ranges
 * and pin list based GPIO ranges is managed correctly by this function.
 *
 * This function assumes the gpio is part of the specified GPIO range, use
 * only after making sure this is the case (e.g. by calling it on the
 * result of successful pinctrl_get_device_gpio_range calls)!
 */
static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
				unsigned int gpio)
{
	unsigned int offset = gpio - range->base;
	if (range->pins)
		return range->pins[offset];
	else
		return range->pin_base + offset;
}

/**
 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
 * @pctldev: pin controller device to check
 * @gpio: gpio pin to check taken from the global GPIO pin space
 *
 * Tries to match a GPIO pin number to the ranges handled by a certain pin
 * controller, return the range or NULL
 */
static struct pinctrl_gpio_range *
pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
{
	struct pinctrl_gpio_range *range = NULL;

	mutex_lock(&pctldev->mutex);
	/* Loop over the ranges */
	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
		/* Check if we're in the valid range */
		if (gpio >= range->base &&
		    gpio < range->base + range->npins) {
			mutex_unlock(&pctldev->mutex);
			return range;
		}
	}
	mutex_unlock(&pctldev->mutex);
	return NULL;
}

/**
 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
 * the same GPIO chip are in range
 * @gpio: gpio pin to check taken from the global GPIO pin space
 *
 * This function is complement of pinctrl_match_gpio_range(). If the return
 * value of pinctrl_match_gpio_range() is NULL, this function could be used
 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
 * of the same GPIO chip don't have back-end pinctrl interface.
 * If the return value is true, it means that pinctrl device is ready & the
 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
 * is false, it means that pinctrl device may not be ready.
 */
#ifdef CONFIG_GPIOLIB
static bool pinctrl_ready_for_gpio_range(unsigned gpio)
{
	struct pinctrl_dev *pctldev;
	struct pinctrl_gpio_range *range = NULL;
	struct gpio_chip *chip = gpio_to_chip(gpio);

	if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
		return false;

	mutex_lock(&pinctrldev_list_mutex);

	/* Loop over the pin controllers */
	list_for_each_entry(pctldev, &pinctrldev_list, node) {
		/* Loop over the ranges */
		mutex_lock(&pctldev->mutex);
		list_for_each_entry(range, &pctldev->gpio_ranges, node) {
			/* Check if any gpio range overlapped with gpio chip */
			if (range->base + range->npins - 1 < chip->base ||
			    range->base > chip->base + chip->ngpio - 1)
				continue;
			mutex_unlock(&pctldev->mutex);
			mutex_unlock(&pinctrldev_list_mutex);
			return true;
		}
		mutex_unlock(&pctldev->mutex);
	}

	mutex_unlock(&pinctrldev_list_mutex);

	return false;
}
#else
static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
#endif

/**
 * pinctrl_get_device_gpio_range() - find device for GPIO range
 * @gpio: the pin to locate the pin controller for
 * @outdev: the pin control device if found
 * @outrange: the GPIO range if found
 *
 * Find the pin controller handling a certain GPIO pin from the pinspace of
 * the GPIO subsystem, return the device and the matching GPIO range. Returns
 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
 * may still have not been registered.
 */
static int pinctrl_get_device_gpio_range(unsigned gpio,
					 struct pinctrl_dev **outdev,
					 struct pinctrl_gpio_range **outrange)
{
	struct pinctrl_dev *pctldev = NULL;

	mutex_lock(&pinctrldev_list_mutex);

	/* Loop over the pin controllers */
	list_for_each_entry(pctldev, &pinctrldev_list, node) {
		struct pinctrl_gpio_range *range;

		range = pinctrl_match_gpio_range(pctldev, gpio);
		if (range != NULL) {
			*outdev = pctldev;
			*outrange = range;
			mutex_unlock(&pinctrldev_list_mutex);
			return 0;
		}
	}

	mutex_unlock(&pinctrldev_list_mutex);

	return -EPROBE_DEFER;
}

/**
 * pinctrl_add_gpio_range() - register a GPIO range for a controller
 * @pctldev: pin controller device to add the range to
 * @range: the GPIO range to add
 *
 * This adds a range of GPIOs to be handled by a certain pin controller. Call
 * this to register handled ranges after registering your pin controller.
 */
void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
			    struct pinctrl_gpio_range *range)
{
	mutex_lock(&pctldev->mutex);
	list_add_tail(&range->node, &pctldev->gpio_ranges);
	mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);

void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
			     struct pinctrl_gpio_range *ranges,
			     unsigned nranges)
{
	int i;

	for (i = 0; i < nranges; i++)
		pinctrl_add_gpio_range(pctldev, &ranges[i]);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);

struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
		struct pinctrl_gpio_range *range)
{
	struct pinctrl_dev *pctldev;

	pctldev = get_pinctrl_dev_from_devname(devname);

	/*
	 * If we can't find this device, let's assume that is because
	 * it has not probed yet, so the driver trying to register this
	 * range need to defer probing.
	 */
	if (!pctldev) {
		return ERR_PTR(-EPROBE_DEFER);
	}
	pinctrl_add_gpio_range(pctldev, range);

	return pctldev;
}
EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);

int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
				const unsigned **pins, unsigned *num_pins)
{
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	int gs;

	if (!pctlops->get_group_pins)
		return -EINVAL;

	gs = pinctrl_get_group_selector(pctldev, pin_group);
	if (gs < 0)
		return gs;

	return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
}
EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);

/**
 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
 * @pctldev: the pin controller device to look in
 * @pin: a controller-local number to find the range for
 */
struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
				 unsigned int pin)
{
	struct pinctrl_gpio_range *range;

	mutex_lock(&pctldev->mutex);
	/* Loop over the ranges */
	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
		/* Check if we're in the valid range */
		if (range->pins) {
			int a;
			for (a = 0; a < range->npins; a++) {
				if (range->pins[a] == pin)
					goto out;
			}
		} else if (pin >= range->pin_base &&
			   pin < range->pin_base + range->npins)
			goto out;
	}
	range = NULL;
out:
	mutex_unlock(&pctldev->mutex);
	return range;
}
EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);

/**
 * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
 * @pctldev: pin controller device to remove the range from
 * @range: the GPIO range to remove
 */
void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
			       struct pinctrl_gpio_range *range)
{
	mutex_lock(&pctldev->mutex);
	list_del(&range->node);
	mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);

/**
 * pinctrl_get_group_selector() - returns the group selector for a group
 * @pctldev: the pin controller handling the group
 * @pin_group: the pin group to look up
 */
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
			       const char *pin_group)
{
	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
	unsigned ngroups = pctlops->get_groups_count(pctldev);
	unsigned group_selector = 0;

	while (group_selector < ngroups) {
		const char *gname = pctlops->get_group_name(pctldev,
							    group_selector);
		if (!strcmp(gname, pin_group)) {
			dev_dbg(pctldev->dev,
				"found group selector %u for %s\n",
				group_selector,
				pin_group);
			return group_selector;
		}

		group_selector++;
	}

	dev_err(pctldev->dev, "does not have pin group %s\n",
		pin_group);

	return -EINVAL;
}

/**
 * pinctrl_request_gpio() - request a single pin to be used as GPIO
 * @gpio: the GPIO pin number from the GPIO subsystem number space
 *
 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 * as part of their gpio_request() semantics, platforms and individual drivers
 * shall *NOT* request GPIO pins to be muxed in.
 */
int pinctrl_request_gpio(unsigned gpio)
{
	struct pinctrl_dev *pctldev;
	struct pinctrl_gpio_range *range;
	int ret;
	int pin;

	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
	if (ret) {
		if (pinctrl_ready_for_gpio_range(gpio))
			ret = 0;
		return ret;
	}

	mutex_lock(&pctldev->mutex);

	/* Convert to the pin controllers number space */
	pin = gpio_to_pin(range, gpio);

	ret = pinmux_request_gpio(pctldev, range, pin, gpio);

	mutex_unlock(&pctldev->mutex);

	return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_request_gpio);

/**
 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
 * @gpio: the GPIO pin number from the GPIO subsystem number space
 *
 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 * as part of their gpio_free() semantics, platforms and individual drivers
 * shall *NOT* request GPIO pins to be muxed out.
 */
void pinctrl_free_gpio(unsigned gpio)
{
	struct pinctrl_dev *pctldev;
	struct pinctrl_gpio_range *range;
	int ret;
	int pin;

	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
	if (ret) {
		return;
	}
	mutex_lock(&pctldev->mutex);

	/* Convert to the pin controllers number space */
	pin = gpio_to_pin(range, gpio);

	pinmux_free_gpio(pctldev, pin, range);

	mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_free_gpio);

static int pinctrl_gpio_direction(unsigned gpio, bool input)
{
	struct pinctrl_dev *pctldev;
	struct pinctrl_gpio_range *range;
	int ret;
	int pin;

	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
	if (ret) {
		return ret;
	}

	mutex_lock(&pctldev->mutex);

	/* Convert to the pin controllers number space */
	pin = gpio_to_pin(range, gpio);
	ret = pinmux_gpio_direction(pctldev, range, pin, input);

	mutex_unlock(&pctldev->mutex);

	return ret;
}

/**
 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
 * @gpio: the GPIO pin number from the GPIO subsystem number space
 *
 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 * as part of their gpio_direction_input() semantics, platforms and individual
 * drivers shall *NOT* touch pin control GPIO calls.
 */
int pinctrl_gpio_direction_input(unsigned gpio)
{
	return pinctrl_gpio_direction(gpio, true);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);

/**
 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
 * @gpio: the GPIO pin number from the GPIO subsystem number space
 *
 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 * as part of their gpio_direction_output() semantics, platforms and individual
 * drivers shall *NOT* touch pin control GPIO calls.
 */
int pinctrl_gpio_direction_output(unsigned gpio)
{
	return pinctrl_gpio_direction(gpio, false);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);

static struct pinctrl_state *find_state(struct pinctrl *p,
					const char *name)
{
	struct pinctrl_state *state;

	list_for_each_entry(state, &p->states, node)
		if (!strcmp(state->name, name))
			return state;

	return NULL;
}

static struct pinctrl_state *create_state(struct pinctrl *p,
					  const char *name)
{
	struct pinctrl_state *state;

	state = kzalloc(sizeof(*state), GFP_KERNEL);
	if (state == NULL) {
		dev_err(p->dev,
			"failed to alloc struct pinctrl_state\n");
		return ERR_PTR(-ENOMEM);
	}

	state->name = name;
	INIT_LIST_HEAD(&state->settings);

	list_add_tail(&state->node, &p->states);

	return state;
}

static int add_setting(struct pinctrl *p, struct pinctrl_map const *map)
{
	struct pinctrl_state *state;
	struct pinctrl_setting *setting;
	int ret;

	state = find_state(p, map->name);
	if (!state)
		state = create_state(p, map->name);
	if (IS_ERR(state))
		return PTR_ERR(state);

	if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
		return 0;

	setting = kzalloc(sizeof(*setting), GFP_KERNEL);
	if (setting == NULL) {
		dev_err(p->dev,
			"failed to alloc struct pinctrl_setting\n");
		return -ENOMEM;
	}

	setting->type = map->type;

	setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
	if (setting->pctldev == NULL) {
		kfree(setting);
		/* Do not defer probing of hogs (circular loop) */
		if (!strcmp(map->ctrl_dev_name, map->dev_name))
			return -ENODEV;
		/*
		 * OK let us guess that the driver is not there yet, and
		 * let's defer obtaining this pinctrl handle to later...
		 */
		dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
			map->ctrl_dev_name);
		return -EPROBE_DEFER;
	}

	setting->dev_name = map->dev_name;

	switch (map->type) {
	case PIN_MAP_TYPE_MUX_GROUP:
		ret = pinmux_map_to_setting(map, setting);
		break;
	case PIN_MAP_TYPE_CONFIGS_PIN:
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		ret = pinconf_map_to_setting(map, setting);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	if (ret < 0) {
		kfree(setting);
		return ret;
	}

	list_add_tail(&setting->node, &state->settings);

	return 0;
}

static struct pinctrl *find_pinctrl(struct device *dev)
{
	struct pinctrl *p;

	mutex_lock(&pinctrl_list_mutex);
	list_for_each_entry(p, &pinctrl_list, node)
		if (p->dev == dev) {
			mutex_unlock(&pinctrl_list_mutex);
			return p;
		}

	mutex_unlock(&pinctrl_list_mutex);
	return NULL;
}

static void pinctrl_free(struct pinctrl *p, bool inlist);

static struct pinctrl *create_pinctrl(struct device *dev)
{
	struct pinctrl *p;
	const char *devname;
	struct pinctrl_maps *maps_node;
	int i;
	struct pinctrl_map const *map;
	int ret;

	/*
	 * create the state cookie holder struct pinctrl for each
	 * mapping, this is what consumers will get when requesting
	 * a pin control handle with pinctrl_get()
	 */
	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL) {
		dev_err(dev, "failed to alloc struct pinctrl\n");
		return ERR_PTR(-ENOMEM);
	}
	p->dev = dev;
	INIT_LIST_HEAD(&p->states);
	INIT_LIST_HEAD(&p->dt_maps);

	ret = pinctrl_dt_to_map(p);
	if (ret < 0) {
		kfree(p);
		return ERR_PTR(ret);
	}

	devname = dev_name(dev);

	mutex_lock(&pinctrl_maps_mutex);
	/* Iterate over the pin control maps to locate the right ones */
	for_each_maps(maps_node, i, map) {
		/* Map must be for this device */
		if (strcmp(map->dev_name, devname))
			continue;

		ret = add_setting(p, map);
		/*
		 * At this point the adding of a setting may:
		 *
		 * - Defer, if the pinctrl device is not yet available
		 * - Fail, if the pinctrl device is not yet available,
		 *   AND the setting is a hog. We cannot defer that, since
		 *   the hog will kick in immediately after the device
		 *   is registered.
		 *
		 * If the error returned was not -EPROBE_DEFER then we
		 * accumulate the errors to see if we end up with
		 * an -EPROBE_DEFER later, as that is the worst case.
		 */
		if (ret == -EPROBE_DEFER) {
			pinctrl_free(p, false);
			mutex_unlock(&pinctrl_maps_mutex);
			return ERR_PTR(ret);
		}
	}
	mutex_unlock(&pinctrl_maps_mutex);

	if (ret < 0) {
		/* If some other error than deferral occured, return here */
		pinctrl_free(p, false);
		return ERR_PTR(ret);
	}

	kref_init(&p->users);

	/* Add the pinctrl handle to the global list */
	mutex_lock(&pinctrl_list_mutex);
	list_add_tail(&p->node, &pinctrl_list);
	mutex_unlock(&pinctrl_list_mutex);

	return p;
}

/**
 * pinctrl_get() - retrieves the pinctrl handle for a device
 * @dev: the device to obtain the handle for
 */
struct pinctrl *pinctrl_get(struct device *dev)
{
	struct pinctrl *p;

	if (WARN_ON(!dev))
		return ERR_PTR(-EINVAL);

	/*
	 * See if somebody else (such as the device core) has already
	 * obtained a handle to the pinctrl for this device. In that case,
	 * return another pointer to it.
	 */
	p = find_pinctrl(dev);
	if (p != NULL) {
		dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
		kref_get(&p->users);
		return p;
	}

	return create_pinctrl(dev);
}
EXPORT_SYMBOL_GPL(pinctrl_get);

static void pinctrl_free_setting(bool disable_setting,
				 struct pinctrl_setting *setting)
{
	switch (setting->type) {
	case PIN_MAP_TYPE_MUX_GROUP:
		if (disable_setting)
			pinmux_disable_setting(setting);
		pinmux_free_setting(setting);
		break;
	case PIN_MAP_TYPE_CONFIGS_PIN:
	case PIN_MAP_TYPE_CONFIGS_GROUP:
		pinconf_free_setting(setting);
		break;
	default:
		break;
	}
}

static void pinctrl_free(struct pinctrl *p, bool inlist)
{
	struct pinctrl_state *state, *n1;
	struct pinctrl_setting *setting, *n2;

	mutex_lock(&pinctrl_list_mutex);
	list_for_each_entry_safe(state, n1, &p->states, node) {
		list_for_each_entry_safe(setting, n2, &state->settings, node) {
			pinctrl_free_setting(state == p->state, setting);
			list_del(&setting->node);
			kfree(setting);
		}
		list_del(&state->node);
		kfree(state);
	}

	pinctrl_dt_free_maps(p);

	if (inlist)
		list_del(&p->node);
	kfree(p);
	mutex_unlock(&pinctrl_list_mutex);
}

/**
 * pinctrl_release() - release the pinctrl handle
 * @kref: the kref in the pinctrl being released
 */
static void pinctrl_release(struct kref *kref)
{
	struct pinctrl *p = container_of(kref, struct pinctrl, users);

	pinctrl_free(p, true);
}

/**
 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
 * @p: the pinctrl handle to release
 */
void pinctrl_put(struct pinctrl *p)
{
	kref_put(&p->users, pinctrl_release);
}
EXPORT_SYMBOL_GPL(pinctrl_put);

/**
 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
 * @p: the pinctrl handle to retrieve the state from
 * @name: the state name to retrieve
 */
struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
						 const char *name)
{
	struct pinctrl_state *state;

	state = find_state(p, name);
	if (!state) {
		if (pinctrl_dummy_state) {
			/* create dummy state */
			dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
				name);
			state = create_state(p, name);
		} else
			state = ERR_PTR(-ENODEV);
	}

	return state;
}
EXPORT_SYMBOL_GPL(pinctrl_lookup_state);

/**
 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
 * @p: the pinctrl handle for the device that requests configuration
 * @state: the state handle to select/activate/program
 */
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
{
	struct pinctrl_setting *setting, *setting2;
	struct pinctrl_state *old_state = p->state;
	int ret;

	if (p->state == state)
		return 0;

	if (p->state) {
		/*
		 * For each pinmux setting in the old state, forget SW's record
		 * of mux owner for that pingroup. Any pingroups which are
		 * still owned by the new state will be re-acquired by the call
		 * to pinmux_enable_setting() in the loop below.
		 */
		list_for_each_entry(setting, &p->state->settings, node) {
			if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
				continue;
			pinmux_disable_setting(setting);
		}
	}

	p->state = NULL;

	/* Apply all the settings for the new state */
	list_for_each_entry(setting, &state->settings, node) {
		switch (setting->type) {
		case PIN_MAP_TYPE_MUX_GROUP:
			ret = pinmux_enable_setting(setting);
			break;
		case PIN_MAP_TYPE_CONFIGS_PIN:
		case PIN_MAP_TYPE_CONFIGS_GROUP:
			ret = pinconf_apply_setting(setting);
			break;
		default:
			ret = -EINVAL;
			break;
		}

		if (ret < 0) {
			goto unapply_new_state;
		}
	}

	p->state = state;

	return 0;

unapply_new_state:
	dev_err(p->dev, "Error applying setting, reverse things back\n");

	list_for_each_entry(setting2, &state->settings, node) {
		if (&setting2->node == &setting->node)
			break;
		/*
		 * All we can do here is pinmux_disable_setting.
		 * That means that some pins are muxed differently now
		 * than they were before applying the setting (We can't
		 * "unmux a pin"!), but it's not a big deal since the pins
		 * are free to be muxed by another apply_setting.
		 */
		if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
			pinmux_disable_setting(setting2);
	}

	/* There's no infinite recursive loop here because p->state is NULL */
	if (old_state)
		pinctrl_select_state(p, old_state);

	return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_select_state);

static void devm_pinctrl_release(struct device *dev, void *res)
{
	pinctrl_put(*(struct pinctrl **)res);
}

/**
 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
 * @dev: the device to obtain the handle for
 *
 * If there is a need to explicitly destroy the returned struct pinctrl,
 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
 */
struct pinctrl *devm_pinctrl_get(struct device *dev)
{
	struct pinctrl **ptr, *p;

	ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	p = pinctrl_get(dev);
	if (!IS_ERR(p)) {
		*ptr = p;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return p;
}
EXPORT_SYMBOL_GPL(devm_pinctrl_get);

static int devm_pinctrl_match(struct device *dev, void *res, void *data)
{
	struct pinctrl **p = res;

	return *p == data;
}

/**
 * devm_pinctrl_put() - Resource managed pinctrl_put()
 * @p: the pinctrl handle to release
 *
 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
 * this function will not need to be called and the resource management
 * code will ensure that the resource is freed.
 */
void devm_pinctrl_put(struct pinctrl *p)
{
	WARN_ON(devres_release(p->dev, devm_pinctrl_release,
			       devm_pinctrl_match, p));
}
EXPORT_SYMBOL_GPL(devm_pinctrl_put);

int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
			 bool dup)
{
	int i, ret;
	struct pinctrl_maps *maps_node;

	pr_debug("add %u pinctrl maps\n", num_maps);

	/* First sanity check the new mapping */
	for (i = 0; i < num_maps; i++) {
		if (!maps[i].dev_name) {
			pr_err("failed to register map %s (%d): no device given\n",
			       maps[i].name, i);
			return -EINVAL;
		}

		if (!maps[i].name) {
			pr_err("failed to register map %d: no map name given\n",
			       i);
			return -EINVAL;
		}

		if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
				!maps[i].ctrl_dev_name) {
			pr_err("failed to register map %s (%d): no pin control device given\n",
			       maps[i].name, i);
			return -EINVAL;
		}

		switch (maps[i].type) {
		case PIN_MAP_TYPE_DUMMY_STATE:
			break;
		case PIN_MAP_TYPE_MUX_GROUP:
			ret = pinmux_validate_map(&maps[i], i);
			if (ret < 0)
				return ret;
			break;
		case PIN_MAP_TYPE_CONFIGS_PIN:
		case PIN_MAP_TYPE_CONFIGS_GROUP:
			ret = pinconf_validate_map(&maps[i], i);
			if (ret < 0)
				return ret;
			break;
		default:
			pr_err("failed to register map %s (%d): invalid type given\n",
			       maps[i].name, i);
			return -EINVAL;
		}
	}

	maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
	if (!maps_node) {
		pr_err("failed to alloc struct pinctrl_maps\n");
		return -ENOMEM;
	}

	maps_node->num_maps = num_maps;
	if (dup) {
		maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
					  GFP_KERNEL);
		if (!maps_node->maps) {
			pr_err("failed to duplicate mapping table\n");
			kfree(maps_node);
			return -ENOMEM;
		}
	} else {
		maps_node->maps = maps;
	}

	mutex_lock(&pinctrl_maps_mutex);
	list_add_tail(&maps_node->node, &pinctrl_maps);
	mutex_unlock(&pinctrl_maps_mutex);

	return 0;
}

/**
 * pinctrl_register_mappings() - register a set of pin controller mappings
 * @maps: the pincontrol mappings table to register. This should probably be
 *	marked with __initdata so it can be discarded after boot. This
 *	function will perform a shallow copy for the mapping entries.
 * @num_maps: the number of maps in the mapping table
 */
int pinctrl_register_mappings(struct pinctrl_map const *maps,
			      unsigned num_maps)
{
	return pinctrl_register_map(maps, num_maps, true);
}

void pinctrl_unregister_map(struct pinctrl_map const *map)
{
	struct pinctrl_maps *maps_node;

	mutex_lock(&pinctrl_maps_mutex);
	list_for_each_entry(maps_node, &pinctrl_maps, node) {
		if (maps_node->maps == map) {
			list_del(&maps_node->node);
			kfree(maps_node);
			mutex_unlock(&pinctrl_maps_mutex);
			return;
		}
	}
	mutex_unlock(&pinctrl_maps_mutex);
}

/**
 * pinctrl_force_sleep() - turn a given controller device into sleep state
 * @pctldev: pin controller device
 */
int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
{
	if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
		return pinctrl_select_state(pctldev->p, pctldev->hog_sleep);
	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_force_sleep);

/**
 * pinctrl_force_default() - turn a given controller device into default state
 * @pctldev: pin controller device
 */
int pinctrl_force_default(struct pinctrl_dev *pctldev)
{
	if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
		return pinctrl_select_state(pctldev->p, pctldev->hog_default);
	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_force_default);

/**
 * pinctrl_init_done() - tell pinctrl probe is done
 *
 * We'll use this time to switch the pins from "init" to "default" unless the
 * driver selected some other state.
 *
 * @dev: device to that's done probing
 */
int pinctrl_init_done(struct device *dev)
{
	struct dev_pin_info *pins = dev->pins;
	int ret;

	if (!pins)
		return 0;

	if (IS_ERR(pins->init_state))
		return 0; /* No such state */

	if (pins->p->state != pins->init_state)
		return 0; /* Not at init anyway */

	if (IS_ERR(pins->default_state))
		return 0; /* No default state */

	ret = pinctrl_select_state(pins->p, pins->default_state);
	if (ret)
		dev_err(dev, "failed to activate default pinctrl state\n");

	return ret;
}

#ifdef CONFIG_PM

/**
 * pinctrl_pm_select_state() - select pinctrl state for PM
 * @dev: device to select default state for
 * @state: state to set
 */
static int pinctrl_pm_select_state(struct device *dev,
				   struct pinctrl_state *state)
{
	struct dev_pin_info *pins = dev->pins;
	int ret;

	if (IS_ERR(state))
		return 0; /* No such state */
	ret = pinctrl_select_state(pins->p, state);
	if (ret)
		dev_err(dev, "failed to activate pinctrl state %s\n",
			state->name);
	return ret;
}

/**
 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
 * @dev: device to select default state for
 */
int pinctrl_pm_select_default_state(struct device *dev)
{
	if (!dev->pins)
		return 0;

	return pinctrl_pm_select_state(dev, dev->pins->default_state);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);

/**
 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
 * @dev: device to select sleep state for
 */
int pinctrl_pm_select_sleep_state(struct device *dev)
{
	if (!dev->pins)
		return 0;

	return pinctrl_pm_select_state(dev, dev->pins->sleep_state);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);

/**
 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
 * @dev: device to select idle state for
 */
int pinctrl_pm_select_idle_state(struct device *dev)
{
	if (!dev->pins)
		return 0;

	return pinctrl_pm_select_state(dev, dev->pins->idle_state);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
#endif

#ifdef CONFIG_DEBUG_FS

static int pinctrl_pins_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev = s->private;
	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
	unsigned i, pin;

	seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);

	mutex_lock(&pctldev->mutex);

	/* The pin number can be retrived from the pin controller descriptor */
	for (i = 0; i < pctldev->desc->npins; i++) {
		struct pin_desc *desc;

		pin = pctldev->desc->pins[i].number;
		desc = pin_desc_get(pctldev, pin);
		/* Pin space may be sparse */
		if (desc == NULL)
			continue;

		seq_printf(s, "pin %d (%s) ", pin,
			   desc->name ? desc->name : "unnamed");

		/* Driver-specific info per pin */
		if (ops->pin_dbg_show)
			ops->pin_dbg_show(pctldev, s, pin);

		seq_puts(s, "\n");
	}

	mutex_unlock(&pctldev->mutex);

	return 0;
}

static int pinctrl_groups_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev = s->private;
	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
	unsigned ngroups, selector = 0;

	mutex_lock(&pctldev->mutex);

	ngroups = ops->get_groups_count(pctldev);

	seq_puts(s, "registered pin groups:\n");
	while (selector < ngroups) {
		const unsigned *pins = NULL;
		unsigned num_pins = 0;
		const char *gname = ops->get_group_name(pctldev, selector);
		const char *pname;
		int ret = 0;
		int i;

		if (ops->get_group_pins)
			ret = ops->get_group_pins(pctldev, selector,
						  &pins, &num_pins);
		if (ret)
			seq_printf(s, "%s [ERROR GETTING PINS]\n",
				   gname);
		else {
			seq_printf(s, "group: %s\n", gname);
			for (i = 0; i < num_pins; i++) {
				pname = pin_get_name(pctldev, pins[i]);
				if (WARN_ON(!pname)) {
					mutex_unlock(&pctldev->mutex);
					return -EINVAL;
				}
				seq_printf(s, "pin %d (%s)\n", pins[i], pname);
			}
			seq_puts(s, "\n");
		}
		selector++;
	}

	mutex_unlock(&pctldev->mutex);

	return 0;
}

static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev = s->private;
	struct pinctrl_gpio_range *range = NULL;

	seq_puts(s, "GPIO ranges handled:\n");

	mutex_lock(&pctldev->mutex);

	/* Loop over the ranges */
	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
		if (range->pins) {
			int a;
			seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
				range->id, range->name,
				range->base, (range->base + range->npins - 1));
			for (a = 0; a < range->npins - 1; a++)
				seq_printf(s, "%u, ", range->pins[a]);
			seq_printf(s, "%u}\n", range->pins[a]);
		}
		else
			seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
				range->id, range->name,
				range->base, (range->base + range->npins - 1),
				range->pin_base,
				(range->pin_base + range->npins - 1));
	}

	mutex_unlock(&pctldev->mutex);

	return 0;
}

static int pinctrl_devices_show(struct seq_file *s, void *what)
{
	struct pinctrl_dev *pctldev;

	seq_puts(s, "name [pinmux] [pinconf]\n");

	mutex_lock(&pinctrldev_list_mutex);

	list_for_each_entry(pctldev, &pinctrldev_list, node) {
		seq_printf(s, "%s ", pctldev->desc->name);
		if (pctldev->desc->pmxops)
			seq_puts(s, "yes ");
		else
			seq_puts(s, "no ");
		if (pctldev->desc->confops)
			seq_puts(s, "yes");
		else
			seq_puts(s, "no");
		seq_puts(s, "\n");
	}

	mutex_unlock(&pinctrldev_list_mutex);

	return 0;
}

static inline const char *map_type(enum pinctrl_map_type type)
{
	static const char * const names[] = {
		"INVALID",
		"DUMMY_STATE",
		"MUX_GROUP",
		"CONFIGS_PIN",
		"CONFIGS_GROUP",
	};

	if (type >= ARRAY_SIZE(names))
		return "UNKNOWN";

	return names[type];
}

static int pinctrl_maps_show(struct seq_file *s, void *what)
{
	struct pinctrl_maps *maps_node;
	int i;
	struct pinctrl_map const *map;

	seq_puts(s, "Pinctrl maps:\n");

	mutex_lock(&pinctrl_maps_mutex);
	for_each_maps(maps_node, i, map) {
		seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
			   map->dev_name, map->name, map_type(map->type),
			   map->type);

		if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
			seq_printf(s, "controlling device %s\n",
				   map->ctrl_dev_name);

		switch (map->type) {
		case PIN_MAP_TYPE_MUX_GROUP:
			pinmux_show_map(s, map);
			break;
		case PIN_MAP_TYPE_CONFIGS_PIN:
		case PIN_MAP_TYPE_CONFIGS_GROUP:
			pinconf_show_map(s, map);
			break;
		default:
			break;
		}

		seq_printf(s, "\n");
	}
	mutex_unlock(&pinctrl_maps_mutex);

	return 0;
}

static int pinctrl_show(struct seq_file *s, void *what)
{
	struct pinctrl *p;
	struct pinctrl_state *state;
	struct pinctrl_setting *setting;

	seq_puts(s, "Requested pin control handlers their pinmux maps:\n");

	mutex_lock(&pinctrl_list_mutex);

	list_for_each_entry(p, &pinctrl_list, node) {
		seq_printf(s, "device: %s current state: %s\n",
			   dev_name(p->dev),
			   p->state ? p->state->name : "none");

		list_for_each_entry(state, &p->states, node) {
			seq_printf(s, "  state: %s\n", state->name);

			list_for_each_entry(setting, &state->settings, node) {
				struct pinctrl_dev *pctldev = setting->pctldev;

				seq_printf(s, "    type: %s controller %s ",
					   map_type(setting->type),
					   pinctrl_dev_get_name(pctldev));

				switch (setting->type) {
				case PIN_MAP_TYPE_MUX_GROUP:
					pinmux_show_setting(s, setting);
					break;
				case PIN_MAP_TYPE_CONFIGS_PIN:
				case PIN_MAP_TYPE_CONFIGS_GROUP:
					pinconf_show_setting(s, setting);
					break;
				default:
					break;
				}
			}
		}
	}

	mutex_unlock(&pinctrl_list_mutex);

	return 0;
}

static int pinctrl_pins_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_pins_show, inode->i_private);
}

static int pinctrl_groups_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_groups_show, inode->i_private);
}

static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_gpioranges_show, inode->i_private);
}

static int pinctrl_devices_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_devices_show, NULL);
}

static int pinctrl_maps_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_maps_show, NULL);
}

static int pinctrl_open(struct inode *inode, struct file *file)
{
	return single_open(file, pinctrl_show, NULL);
}

static const struct file_operations pinctrl_pins_ops = {
	.open		= pinctrl_pins_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinctrl_groups_ops = {
	.open		= pinctrl_groups_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinctrl_gpioranges_ops = {
	.open		= pinctrl_gpioranges_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinctrl_devices_ops = {
	.open		= pinctrl_devices_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinctrl_maps_ops = {
	.open		= pinctrl_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static const struct file_operations pinctrl_ops = {
	.open		= pinctrl_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct dentry *debugfs_root;

static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
	struct dentry *device_root;

	device_root = debugfs_create_dir(dev_name(pctldev->dev),
					 debugfs_root);
	pctldev->device_root = device_root;

	if (IS_ERR(device_root) || !device_root) {
		pr_warn("failed to create debugfs directory for %s\n",
			dev_name(pctldev->dev));
		return;
	}
	debugfs_create_file("pins", S_IFREG | S_IRUGO,
			    device_root, pctldev, &pinctrl_pins_ops);
	debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
			    device_root, pctldev, &pinctrl_groups_ops);
	debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
			    device_root, pctldev, &pinctrl_gpioranges_ops);
	if (pctldev->desc->pmxops)
		pinmux_init_device_debugfs(device_root, pctldev);
	if (pctldev->desc->confops)
		pinconf_init_device_debugfs(device_root, pctldev);
}

static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
{
	debugfs_remove_recursive(pctldev->device_root);
}

static void pinctrl_init_debugfs(void)
{
	debugfs_root = debugfs_create_dir("pinctrl", NULL);
	if (IS_ERR(debugfs_root) || !debugfs_root) {
		pr_warn("failed to create debugfs directory\n");
		debugfs_root = NULL;
		return;
	}

	debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
			    debugfs_root, NULL, &pinctrl_devices_ops);
	debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
			    debugfs_root, NULL, &pinctrl_maps_ops);
	debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
			    debugfs_root, NULL, &pinctrl_ops);
}

#else /* CONFIG_DEBUG_FS */

static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
}

static void pinctrl_init_debugfs(void)
{
}

static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
{
}

#endif

static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
{
	const struct pinctrl_ops *ops = pctldev->desc->pctlops;

	if (!ops ||
	    !ops->get_groups_count ||
	    !ops->get_group_name)
		return -EINVAL;

	if (ops->dt_node_to_map && !ops->dt_free_map)
		return -EINVAL;

	return 0;
}

/**
 * pinctrl_register() - register a pin controller device
 * @pctldesc: descriptor for this pin controller
 * @dev: parent device for this pin controller
 * @driver_data: private pin controller data for this pin controller
 */
struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
				    struct device *dev, void *driver_data)
{
	struct pinctrl_dev *pctldev;
	int ret;

	if (!pctldesc)
		return ERR_PTR(-EINVAL);
	if (!pctldesc->name)
		return ERR_PTR(-EINVAL);

	pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
	if (pctldev == NULL) {
		dev_err(dev, "failed to alloc struct pinctrl_dev\n");
		return ERR_PTR(-ENOMEM);
	}

	/* Initialize pin control device struct */
	pctldev->owner = pctldesc->owner;
	pctldev->desc = pctldesc;
	pctldev->driver_data = driver_data;
	INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
	INIT_LIST_HEAD(&pctldev->gpio_ranges);
	pctldev->dev = dev;
	mutex_init(&pctldev->mutex);

	/* check core ops for sanity */
	ret = pinctrl_check_ops(pctldev);
	if (ret) {
		dev_err(dev, "pinctrl ops lacks necessary functions\n");
		goto out_err;
	}

	/* If we're implementing pinmuxing, check the ops for sanity */
	if (pctldesc->pmxops) {
		ret = pinmux_check_ops(pctldev);
		if (ret)
			goto out_err;
	}

	/* If we're implementing pinconfig, check the ops for sanity */
	if (pctldesc->confops) {
		ret = pinconf_check_ops(pctldev);
		if (ret)
			goto out_err;
	}

	/* Register all the pins */
	dev_dbg(dev, "try to register %d pins ...\n",  pctldesc->npins);
	ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
	if (ret) {
		dev_err(dev, "error during pin registration\n");
		pinctrl_free_pindescs(pctldev, pctldesc->pins,
				      pctldesc->npins);
		goto out_err;
	}

	mutex_lock(&pinctrldev_list_mutex);
	list_add_tail(&pctldev->node, &pinctrldev_list);
	mutex_unlock(&pinctrldev_list_mutex);

	pctldev->p = pinctrl_get(pctldev->dev);

	if (!IS_ERR(pctldev->p)) {
		pctldev->hog_default =
			pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
		if (IS_ERR(pctldev->hog_default)) {
			dev_dbg(dev, "failed to lookup the default state\n");
		} else {
			if (pinctrl_select_state(pctldev->p,
						pctldev->hog_default))
				dev_err(dev,
					"failed to select default state\n");
		}

		pctldev->hog_sleep =
			pinctrl_lookup_state(pctldev->p,
						    PINCTRL_STATE_SLEEP);
		if (IS_ERR(pctldev->hog_sleep))
			dev_dbg(dev, "failed to lookup the sleep state\n");
	}

	pinctrl_init_device_debugfs(pctldev);

	return pctldev;

out_err:
	mutex_destroy(&pctldev->mutex);
	kfree(pctldev);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(pinctrl_register);

/**
 * pinctrl_unregister() - unregister pinmux
 * @pctldev: pin controller to unregister
 *
 * Called by pinmux drivers to unregister a pinmux.
 */
void pinctrl_unregister(struct pinctrl_dev *pctldev)
{
	struct pinctrl_gpio_range *range, *n;
	if (pctldev == NULL)
		return;

	mutex_lock(&pctldev->mutex);
	pinctrl_remove_device_debugfs(pctldev);
	mutex_unlock(&pctldev->mutex);

	if (!IS_ERR(pctldev->p))
		pinctrl_put(pctldev->p);

	mutex_lock(&pinctrldev_list_mutex);
	mutex_lock(&pctldev->mutex);
	/* TODO: check that no pinmuxes are still active? */
	list_del(&pctldev->node);
	/* Destroy descriptor tree */
	pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
			      pctldev->desc->npins);
	/* remove gpio ranges map */
	list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
		list_del(&range->node);

	mutex_unlock(&pctldev->mutex);
	mutex_destroy(&pctldev->mutex);
	kfree(pctldev);
	mutex_unlock(&pinctrldev_list_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);

static int __init pinctrl_init(void)
{
	pr_info("initialized pinctrl subsystem\n");
	pinctrl_init_debugfs();
	return 0;
}

/* init early since many drivers really need to initialized pinmux early */
core_initcall(pinctrl_init);