summaryrefslogtreecommitdiff
path: root/drivers/usb/misc/usb251xb.c
blob: 5234bc3e0f01f10e0bb265df94fc213ed696112d (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
 * Configuration via SMBus.
 *
 * Copyright (c) 2017 SKIDATA AG
 *
 * This work is based on the USB3503 driver by Dongjin Kim and
 * a not-accepted patch by Fabien Lahoudere, see:
 * https://patchwork.kernel.org/patch/9257715/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/of_device.h>
#include <linux/slab.h>

/* Internal Register Set Addresses & Default Values acc. to DS00001692C */
#define USB251XB_ADDR_VENDOR_ID_LSB	0x00
#define USB251XB_ADDR_VENDOR_ID_MSB	0x01
#define USB251XB_DEF_VENDOR_ID		0x0424

#define USB251XB_ADDR_PRODUCT_ID_LSB	0x02
#define USB251XB_ADDR_PRODUCT_ID_MSB	0x03
#define USB251XB_DEF_PRODUCT_ID_12	0x2512 /* USB2512B/12Bi */
#define USB251XB_DEF_PRODUCT_ID_13	0x2513 /* USB2513B/13Bi */
#define USB251XB_DEF_PRODUCT_ID_14	0x2514 /* USB2514B/14Bi */
#define USB251XB_DEF_PRODUCT_ID_17	0x2517 /* USB2517/17i */

#define USB251XB_ADDR_DEVICE_ID_LSB	0x04
#define USB251XB_ADDR_DEVICE_ID_MSB	0x05
#define USB251XB_DEF_DEVICE_ID		0x0BB3

#define USB251XB_ADDR_CONFIG_DATA_1	0x06
#define USB251XB_DEF_CONFIG_DATA_1	0x9B
#define USB251XB_ADDR_CONFIG_DATA_2	0x07
#define USB251XB_DEF_CONFIG_DATA_2	0x20
#define USB251XB_ADDR_CONFIG_DATA_3	0x08
#define USB251XB_DEF_CONFIG_DATA_3	0x02

#define USB251XB_ADDR_NON_REMOVABLE_DEVICES	0x09
#define USB251XB_DEF_NON_REMOVABLE_DEVICES	0x00

#define USB251XB_ADDR_PORT_DISABLE_SELF	0x0A
#define USB251XB_DEF_PORT_DISABLE_SELF	0x00
#define USB251XB_ADDR_PORT_DISABLE_BUS	0x0B
#define USB251XB_DEF_PORT_DISABLE_BUS	0x00

#define USB251XB_ADDR_MAX_POWER_SELF	0x0C
#define USB251XB_DEF_MAX_POWER_SELF	0x01
#define USB251XB_ADDR_MAX_POWER_BUS	0x0D
#define USB251XB_DEF_MAX_POWER_BUS	0x32

#define USB251XB_ADDR_MAX_CURRENT_SELF	0x0E
#define USB251XB_DEF_MAX_CURRENT_SELF	0x01
#define USB251XB_ADDR_MAX_CURRENT_BUS	0x0F
#define USB251XB_DEF_MAX_CURRENT_BUS	0x32

#define USB251XB_ADDR_POWER_ON_TIME	0x10
#define USB251XB_DEF_POWER_ON_TIME	0x32

#define USB251XB_ADDR_LANGUAGE_ID_HIGH	0x11
#define USB251XB_ADDR_LANGUAGE_ID_LOW	0x12
#define USB251XB_DEF_LANGUAGE_ID	0x0000

#define USB251XB_STRING_BUFSIZE			62
#define USB251XB_ADDR_MANUFACTURER_STRING_LEN	0x13
#define USB251XB_ADDR_MANUFACTURER_STRING	0x16
#define USB251XB_DEF_MANUFACTURER_STRING	"Microchip"

#define USB251XB_ADDR_PRODUCT_STRING_LEN	0x14
#define USB251XB_ADDR_PRODUCT_STRING		0x54
#define USB251XB_DEF_PRODUCT_STRING		"USB251xB/xBi/7i"

#define USB251XB_ADDR_SERIAL_STRING_LEN		0x15
#define USB251XB_ADDR_SERIAL_STRING		0x92
#define USB251XB_DEF_SERIAL_STRING		""

#define USB251XB_ADDR_BATTERY_CHARGING_ENABLE	0xD0
#define USB251XB_DEF_BATTERY_CHARGING_ENABLE	0x00

#define USB251XB_ADDR_BOOST_UP	0xF6
#define USB251XB_DEF_BOOST_UP	0x00
#define USB251XB_ADDR_BOOST_57	0xF7
#define USB251XB_DEF_BOOST_57	0x00
#define USB251XB_ADDR_BOOST_14	0xF8
#define USB251XB_DEF_BOOST_14	0x00

#define USB251XB_ADDR_PORT_SWAP	0xFA
#define USB251XB_DEF_PORT_SWAP	0x00

#define USB251XB_ADDR_PORT_MAP_12	0xFB
#define USB251XB_DEF_PORT_MAP_12	0x00
#define USB251XB_ADDR_PORT_MAP_34	0xFC
#define USB251XB_DEF_PORT_MAP_34	0x00 /* USB251{3B/i,4B/i,7/i} only */
#define USB251XB_ADDR_PORT_MAP_56	0xFD
#define USB251XB_DEF_PORT_MAP_56	0x00 /* USB2517/i only */
#define USB251XB_ADDR_PORT_MAP_7	0xFE
#define USB251XB_DEF_PORT_MAP_7		0x00 /* USB2517/i only */

#define USB251XB_ADDR_STATUS_COMMAND		0xFF
#define USB251XB_STATUS_COMMAND_SMBUS_DOWN	0x04
#define USB251XB_STATUS_COMMAND_RESET		0x02
#define USB251XB_STATUS_COMMAND_ATTACH		0x01

#define USB251XB_I2C_REG_SZ	0x100
#define USB251XB_I2C_WRITE_SZ	0x10

#define DRIVER_NAME	"usb251xb"
#define DRIVER_DESC	"Microchip USB 2.0 Hi-Speed Hub Controller"

struct usb251xb {
	struct device *dev;
	struct i2c_client *i2c;
	u8 skip_config;
	struct gpio_desc *gpio_reset;
	u16 vendor_id;
	u16 product_id;
	u16 device_id;
	u8  conf_data1;
	u8  conf_data2;
	u8  conf_data3;
	u8  non_rem_dev;
	u8  port_disable_sp;
	u8  port_disable_bp;
	u8  max_power_sp;
	u8  max_power_bp;
	u8  max_current_sp;
	u8  max_current_bp;
	u8  power_on_time;
	u16 lang_id;
	u8 manufacturer_len;
	u8 product_len;
	u8 serial_len;
	char manufacturer[USB251XB_STRING_BUFSIZE];
	char product[USB251XB_STRING_BUFSIZE];
	char serial[USB251XB_STRING_BUFSIZE];
	u8  bat_charge_en;
	u8  boost_up;
	u8  boost_57;
	u8  boost_14;
	u8  port_swap;
	u8  port_map12;
	u8  port_map34;
	u8  port_map56;
	u8  port_map7;
	u8  status;
};

struct usb251xb_data {
	u16 product_id;
	u8 port_cnt;
	bool led_support;
	bool bat_support;
	char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
};

static const struct usb251xb_data usb2512b_data = {
	.product_id = 0x2512,
	.port_cnt = 2,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2512B",
};

static const struct usb251xb_data usb2512bi_data = {
	.product_id = 0x2512,
	.port_cnt = 2,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2512Bi",
};

static const struct usb251xb_data usb2513b_data = {
	.product_id = 0x2513,
	.port_cnt = 3,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2513B",
};

static const struct usb251xb_data usb2513bi_data = {
	.product_id = 0x2513,
	.port_cnt = 3,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2513Bi",
};

static const struct usb251xb_data usb2514b_data = {
	.product_id = 0x2514,
	.port_cnt = 4,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2514B",
};

static const struct usb251xb_data usb2514bi_data = {
	.product_id = 0x2514,
	.port_cnt = 4,
	.led_support = false,
	.bat_support = true,
	.product_str = "USB2514Bi",
};

static const struct usb251xb_data usb2517_data = {
	.product_id = 0x2517,
	.port_cnt = 7,
	.led_support = true,
	.bat_support = false,
	.product_str = "USB2517",
};

static const struct usb251xb_data usb2517i_data = {
	.product_id = 0x2517,
	.port_cnt = 7,
	.led_support = true,
	.bat_support = false,
	.product_str = "USB2517i",
};

static void usb251xb_reset(struct usb251xb *hub, int state)
{
	if (!hub->gpio_reset)
		return;

	gpiod_set_value_cansleep(hub->gpio_reset, state);

	/* wait for hub recovery/stabilization */
	if (!state)
		usleep_range(500, 750);	/* >=500us at power on */
	else
		usleep_range(1, 10);	/* >=1us at power down */
}

static int usb251xb_connect(struct usb251xb *hub)
{
	struct device *dev = hub->dev;
	int err, i;
	char i2c_wb[USB251XB_I2C_REG_SZ];

	memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);

	if (hub->skip_config) {
		dev_info(dev, "Skip hub configuration, only attach.\n");
		i2c_wb[0] = 0x01;
		i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;

		usb251xb_reset(hub, 0);

		err = i2c_smbus_write_i2c_block_data(hub->i2c,
				USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
		if (err) {
			dev_err(dev, "attaching hub failed: %d\n", err);
			return err;
		}
		return 0;
	}

	i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
	i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
	i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
	i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
	i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
	i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
	i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
	i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
	i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
	i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
	i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
	i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
	i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
	i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
	i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
	i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
	i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
	i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
	i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
	i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
	i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
	i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
	memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
	       USB251XB_STRING_BUFSIZE);
	memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
	       USB251XB_STRING_BUFSIZE);
	memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
	       USB251XB_STRING_BUFSIZE);
	i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
	i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
	i2c_wb[USB251XB_ADDR_BOOST_57]          = hub->boost_57;
	i2c_wb[USB251XB_ADDR_BOOST_14]          = hub->boost_14;
	i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
	i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
	i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
	i2c_wb[USB251XB_ADDR_PORT_MAP_56]       = hub->port_map56;
	i2c_wb[USB251XB_ADDR_PORT_MAP_7]        = hub->port_map7;
	i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;

	usb251xb_reset(hub, 0);

	/* write registers */
	for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
		int offset = i * USB251XB_I2C_WRITE_SZ;
		char wbuf[USB251XB_I2C_WRITE_SZ + 1];

		/* The first data byte transferred tells the hub how many data
		 * bytes will follow (byte count).
		 */
		wbuf[0] = USB251XB_I2C_WRITE_SZ;
		memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);

		dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
			USB251XB_I2C_WRITE_SZ, i, offset);

		err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
						     USB251XB_I2C_WRITE_SZ + 1,
						     wbuf);
		if (err)
			goto out_err;
	}

	dev_info(dev, "Hub configuration was successful.\n");
	return 0;

out_err:
	dev_err(dev, "configuring block %d failed: %d\n", i, err);
	return err;
}

#ifdef CONFIG_OF
static int usb251xb_get_ofdata(struct usb251xb *hub,
			       struct usb251xb_data *data)
{
	struct device *dev = hub->dev;
	struct device_node *np = dev->of_node;
	int len, err, i;
	u32 property_u32 = 0;
	const u32 *cproperty_u32;
	const char *cproperty_char;
	char str[USB251XB_STRING_BUFSIZE / 2];

	if (!np) {
		dev_err(dev, "failed to get ofdata\n");
		return -ENODEV;
	}

	if (of_get_property(np, "skip-config", NULL))
		hub->skip_config = 1;
	else
		hub->skip_config = 0;

	hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	if (PTR_ERR(hub->gpio_reset) == -EPROBE_DEFER) {
		return -EPROBE_DEFER;
	} else if (IS_ERR(hub->gpio_reset)) {
		err = PTR_ERR(hub->gpio_reset);
		dev_err(dev, "unable to request GPIO reset pin (%d)\n", err);
		return err;
	}

	if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
		hub->vendor_id = USB251XB_DEF_VENDOR_ID;

	if (of_property_read_u16_array(np, "product-id",
				       &hub->product_id, 1))
		hub->product_id = data->product_id;

	if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
		hub->device_id = USB251XB_DEF_DEVICE_ID;

	hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
	if (of_get_property(np, "self-powered", NULL)) {
		hub->conf_data1 |= BIT(7);

		/* Configure Over-Current sens when self-powered */
		hub->conf_data1 &= ~BIT(2);
		if (of_get_property(np, "ganged-sensing", NULL))
			hub->conf_data1 &= ~BIT(1);
		else if (of_get_property(np, "individual-sensing", NULL))
			hub->conf_data1 |= BIT(1);
	} else if (of_get_property(np, "bus-powered", NULL)) {
		hub->conf_data1 &= ~BIT(7);

		/* Disable Over-Current sense when bus-powered */
		hub->conf_data1 |= BIT(2);
	}

	if (of_get_property(np, "disable-hi-speed", NULL))
		hub->conf_data1 |= BIT(5);

	if (of_get_property(np, "multi-tt", NULL))
		hub->conf_data1 |= BIT(4);
	else if (of_get_property(np, "single-tt", NULL))
		hub->conf_data1 &= ~BIT(4);

	if (of_get_property(np, "disable-eop", NULL))
		hub->conf_data1 |= BIT(3);

	if (of_get_property(np, "individual-port-switching", NULL))
		hub->conf_data1 |= BIT(0);
	else if (of_get_property(np, "ganged-port-switching", NULL))
		hub->conf_data1 &= ~BIT(0);

	hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
	if (of_get_property(np, "dynamic-power-switching", NULL))
		hub->conf_data2 |= BIT(7);

	if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
		if (property_u32 == 100) {
			/* 100 us*/
			hub->conf_data2 &= ~BIT(5);
			hub->conf_data2 &= ~BIT(4);
		} else if (property_u32 == 4000) {
			/* 4 ms */
			hub->conf_data2 &= ~BIT(5);
			hub->conf_data2 |= BIT(4);
		} else if (property_u32 == 16000) {
			/* 16 ms */
			hub->conf_data2 |= BIT(5);
			hub->conf_data2 |= BIT(4);
		} else {
			/* 8 ms (DEFAULT) */
			hub->conf_data2 |= BIT(5);
			hub->conf_data2 &= ~BIT(4);
		}
	}

	if (of_get_property(np, "compound-device", NULL))
		hub->conf_data2 |= BIT(3);

	hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
	if (of_get_property(np, "port-mapping-mode", NULL))
		hub->conf_data3 |= BIT(3);

	if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
		hub->conf_data3 &= ~BIT(1);

	if (of_get_property(np, "string-support", NULL))
		hub->conf_data3 |= BIT(0);

	hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
	cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
		for (i = 0; i < len / sizeof(u32); i++) {
			u32 port = be32_to_cpu(cproperty_u32[i]);

			if ((port >= 1) && (port <= data->port_cnt))
				hub->non_rem_dev |= BIT(port);
			else
				dev_warn(dev, "NRD port %u doesn't exist\n",
					port);
		}
	}

	hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
	cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
		for (i = 0; i < len / sizeof(u32); i++) {
			u32 port = be32_to_cpu(cproperty_u32[i]);

			if ((port >= 1) && (port <= data->port_cnt))
				hub->port_disable_sp |= BIT(port);
			else
				dev_warn(dev, "PDS port %u doesn't exist\n",
					port);
		}
	}

	hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
	cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
	if (cproperty_u32 && (len / sizeof(u32)) > 0) {
		for (i = 0; i < len / sizeof(u32); i++) {
			u32 port = be32_to_cpu(cproperty_u32[i]);

			if ((port >= 1) && (port <= data->port_cnt))
				hub->port_disable_bp |= BIT(port);
			else
				dev_warn(dev, "PDB port %u doesn't exist\n",
					port);
		}
	}

	hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
	if (!of_property_read_u32(np, "sp-max-total-current-microamp",
	    &property_u32))
		hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);

	hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
	if (!of_property_read_u32(np, "bp-max-total-current-microamp",
	    &property_u32))
		hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);

	hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
	if (!of_property_read_u32(np, "sp-max-removable-current-microamp",
	    &property_u32))
		hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);

	hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
	if (!of_property_read_u32(np, "bp-max-removable-current-microamp",
	    &property_u32))
		hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);

	hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
	if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
		hub->power_on_time = min_t(u8, property_u32 / 2, 255);

	if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
		hub->lang_id = USB251XB_DEF_LANGUAGE_ID;

	cproperty_char = of_get_property(np, "manufacturer", NULL);
	strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
		sizeof(str));
	hub->manufacturer_len = strlen(str) & 0xFF;
	memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
	len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
	len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
			      (wchar_t *)hub->manufacturer,
			      USB251XB_STRING_BUFSIZE);

	cproperty_char = of_get_property(np, "product", NULL);
	strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
	hub->product_len = strlen(str) & 0xFF;
	memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
	len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
	len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
			      (wchar_t *)hub->product,
			      USB251XB_STRING_BUFSIZE);

	cproperty_char = of_get_property(np, "serial", NULL);
	strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
		sizeof(str));
	hub->serial_len = strlen(str) & 0xFF;
	memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
	len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
	len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
			      (wchar_t *)hub->serial,
			      USB251XB_STRING_BUFSIZE);

	/* The following parameters are currently not exposed to devicetree, but
	 * may be as soon as needed.
	 */
	hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
	hub->boost_up = USB251XB_DEF_BOOST_UP;
	hub->boost_57 = USB251XB_DEF_BOOST_57;
	hub->boost_14 = USB251XB_DEF_BOOST_14;
	hub->port_swap = USB251XB_DEF_PORT_SWAP;
	hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
	hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
	hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
	hub->port_map7  = USB251XB_DEF_PORT_MAP_7;

	return 0;
}

static const struct of_device_id usb251xb_of_match[] = {
	{
		.compatible = "microchip,usb2512b",
		.data = &usb2512b_data,
	}, {
		.compatible = "microchip,usb2512bi",
		.data = &usb2512bi_data,
	}, {
		.compatible = "microchip,usb2513b",
		.data = &usb2513b_data,
	}, {
		.compatible = "microchip,usb2513bi",
		.data = &usb2513bi_data,
	}, {
		.compatible = "microchip,usb2514b",
		.data = &usb2514b_data,
	}, {
		.compatible = "microchip,usb2514bi",
		.data = &usb2514bi_data,
	}, {
		.compatible = "microchip,usb2517",
		.data = &usb2517_data,
	}, {
		.compatible = "microchip,usb2517i",
		.data = &usb2517i_data,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, usb251xb_of_match);
#else /* CONFIG_OF */
static int usb251xb_get_ofdata(struct usb251xb *hub,
			       struct usb251xb_data *data)
{
	return 0;
}
#endif /* CONFIG_OF */

static int usb251xb_probe(struct usb251xb *hub)
{
	struct device *dev = hub->dev;
	struct device_node *np = dev->of_node;
	const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
							   dev);
	int err;

	if (np) {
		err = usb251xb_get_ofdata(hub,
					  (struct usb251xb_data *)of_id->data);
		if (err) {
			dev_err(dev, "failed to get ofdata: %d\n", err);
			return err;
		}
	}

	err = usb251xb_connect(hub);
	if (err) {
		dev_err(dev, "Failed to connect hub (%d)\n", err);
		return err;
	}

	dev_info(dev, "Hub probed successfully\n");

	return 0;
}

static int usb251xb_i2c_probe(struct i2c_client *i2c,
			      const struct i2c_device_id *id)
{
	struct usb251xb *hub;

	hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
	if (!hub)
		return -ENOMEM;

	i2c_set_clientdata(i2c, hub);
	hub->dev = &i2c->dev;
	hub->i2c = i2c;

	return usb251xb_probe(hub);
}

static const struct i2c_device_id usb251xb_id[] = {
	{ "usb2512b", 0 },
	{ "usb2512bi", 0 },
	{ "usb2513b", 0 },
	{ "usb2513bi", 0 },
	{ "usb2514b", 0 },
	{ "usb2514bi", 0 },
	{ "usb2517", 0 },
	{ "usb2517i", 0 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, usb251xb_id);

static struct i2c_driver usb251xb_i2c_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = of_match_ptr(usb251xb_of_match),
	},
	.probe    = usb251xb_i2c_probe,
	.id_table = usb251xb_id,
};

module_i2c_driver(usb251xb_i2c_driver);

MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
MODULE_LICENSE("GPL");