summaryrefslogtreecommitdiff
path: root/drivers/usb/serial/keyspan_pda.c
blob: e6f933e8d25ffa5d1b7f05f529d66435d3da2d2f (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * USB Keyspan PDA / Xircom / Entrega Converter driver
 *
 * Copyright (C) 1999 - 2001 Greg Kroah-Hartman	<greg@kroah.com>
 * Copyright (C) 1999, 2000 Brian Warner	<warner@lothar.com>
 * Copyright (C) 2000 Al Borchers		<borchers@steinerpoint.com>
 * Copyright (C) 2020 Johan Hovold <johan@kernel.org>
 *
 * See Documentation/usb/usb-serial.rst for more information on using this
 * driver
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/usb/ezusb.h>

#define DRIVER_AUTHOR "Brian Warner <warner@lothar.com>, Johan Hovold <johan@kernel.org>"
#define DRIVER_DESC "USB Keyspan PDA Converter driver"

#define KEYSPAN_TX_THRESHOLD	128

struct keyspan_pda_private {
	int			tx_room;
	struct work_struct	unthrottle_work;
	struct usb_serial	*serial;
	struct usb_serial_port	*port;
};

static int keyspan_pda_write_start(struct usb_serial_port *port);

#define KEYSPAN_VENDOR_ID		0x06cd
#define KEYSPAN_PDA_FAKE_ID		0x0103
#define KEYSPAN_PDA_ID			0x0104 /* no clue */

/* For Xircom PGSDB9 and older Entrega version of the same device */
#define XIRCOM_VENDOR_ID		0x085a
#define XIRCOM_FAKE_ID			0x8027
#define XIRCOM_FAKE_ID_2		0x8025 /* "PGMFHUB" serial */
#define ENTREGA_VENDOR_ID		0x1645
#define ENTREGA_FAKE_ID			0x8093

static const struct usb_device_id id_table_combined[] = {
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID_2) },
	{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_ID) },
	{ }						/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table_combined);

static const struct usb_device_id id_table_std[] = {
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_ID) },
	{ }						/* Terminating entry */
};

static const struct usb_device_id id_table_fake[] = {
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID_2) },
	{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
	{ }						/* Terminating entry */
};

static int keyspan_pda_get_write_room(struct keyspan_pda_private *priv)
{
	struct usb_serial_port *port = priv->port;
	struct usb_serial *serial = port->serial;
	u8 *room;
	int rc;

	room = kmalloc(1, GFP_KERNEL);
	if (!room)
		return -ENOMEM;

	rc = usb_control_msg(serial->dev,
			     usb_rcvctrlpipe(serial->dev, 0),
			     6, /* write_room */
			     USB_TYPE_VENDOR | USB_RECIP_INTERFACE
			     | USB_DIR_IN,
			     0, /* value: 0 means "remaining room" */
			     0, /* index */
			     room,
			     1,
			     2000);
	if (rc != 1) {
		if (rc >= 0)
			rc = -EIO;
		dev_dbg(&port->dev, "roomquery failed: %d\n", rc);
		goto out_free;
	}

	dev_dbg(&port->dev, "roomquery says %d\n", *room);
	rc = *room;
out_free:
	kfree(room);

	return rc;
}

static void keyspan_pda_request_unthrottle(struct work_struct *work)
{
	struct keyspan_pda_private *priv =
		container_of(work, struct keyspan_pda_private, unthrottle_work);
	struct usb_serial_port *port = priv->port;
	struct usb_serial *serial = port->serial;
	unsigned long flags;
	int result;

	dev_dbg(&port->dev, "%s\n", __func__);

	/*
	 * Ask the device to tell us when the tx buffer becomes
	 * sufficiently empty.
	 */
	result = usb_control_msg(serial->dev,
				 usb_sndctrlpipe(serial->dev, 0),
				 7, /* request_unthrottle */
				 USB_TYPE_VENDOR | USB_RECIP_INTERFACE
				 | USB_DIR_OUT,
				 KEYSPAN_TX_THRESHOLD,
				 0, /* index */
				 NULL,
				 0,
				 2000);
	if (result < 0)
		dev_dbg(&serial->dev->dev, "%s - error %d from usb_control_msg\n",
			__func__, result);
	/*
	 * Need to check available space after requesting notification in case
	 * buffer is already empty so that no notification is sent.
	 */
	result = keyspan_pda_get_write_room(priv);
	if (result > KEYSPAN_TX_THRESHOLD) {
		spin_lock_irqsave(&port->lock, flags);
		priv->tx_room = max(priv->tx_room, result);
		spin_unlock_irqrestore(&port->lock, flags);

		usb_serial_port_softint(port);
	}
}

static void keyspan_pda_rx_interrupt(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	unsigned int len = urb->actual_length;
	int retval;
	int status = urb->status;
	struct keyspan_pda_private *priv;
	unsigned long flags;

	priv = usb_get_serial_port_data(port);

	switch (status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", __func__, status);
		return;
	default:
		dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
		goto exit;
	}

	if (len < 1) {
		dev_warn(&port->dev, "short message received\n");
		goto exit;
	}

	/* see if the message is data or a status interrupt */
	switch (data[0]) {
	case 0:
		 /* rest of message is rx data */
		if (len < 2)
			break;
		tty_insert_flip_string(&port->port, data + 1, len - 1);
		tty_flip_buffer_push(&port->port);
		break;
	case 1:
		/* status interrupt */
		if (len < 2) {
			dev_warn(&port->dev, "short interrupt message received\n");
			break;
		}
		dev_dbg(&port->dev, "rx int, d1=%d\n", data[1]);
		switch (data[1]) {
		case 1: /* modemline change */
			break;
		case 2: /* tx unthrottle interrupt */
			spin_lock_irqsave(&port->lock, flags);
			priv->tx_room = max(priv->tx_room, KEYSPAN_TX_THRESHOLD);
			spin_unlock_irqrestore(&port->lock, flags);

			keyspan_pda_write_start(port);

			usb_serial_port_softint(port);
			break;
		default:
			break;
		}
		break;
	default:
		break;
	}

exit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(&port->dev,
			"%s - usb_submit_urb failed with result %d\n",
			__func__, retval);
}

static void keyspan_pda_rx_throttle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;

	/*
	 * Stop receiving characters. We just turn off the URB request, and
	 * let chars pile up in the device. If we're doing hardware
	 * flowcontrol, the device will signal the other end when its buffer
	 * fills up. If we're doing XON/XOFF, this would be a good time to
	 * send an XOFF, although it might make sense to foist that off upon
	 * the device too.
	 */
	usb_kill_urb(port->interrupt_in_urb);
}

static void keyspan_pda_rx_unthrottle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;

	/* just restart the receive interrupt URB */
	if (usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL))
		dev_dbg(&port->dev, "usb_submit_urb(read urb) failed\n");
}

static speed_t keyspan_pda_setbaud(struct usb_serial *serial, speed_t baud)
{
	int rc;
	int bindex;

	switch (baud) {
	case 110:
		bindex = 0;
		break;
	case 300:
		bindex = 1;
		break;
	case 1200:
		bindex = 2;
		break;
	case 2400:
		bindex = 3;
		break;
	case 4800:
		bindex = 4;
		break;
	case 9600:
		bindex = 5;
		break;
	case 19200:
		bindex = 6;
		break;
	case 38400:
		bindex = 7;
		break;
	case 57600:
		bindex = 8;
		break;
	case 115200:
		bindex = 9;
		break;
	default:
		bindex = 5;	/* Default to 9600 */
		baud = 9600;
	}

	rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			     0, /* set baud */
			     USB_TYPE_VENDOR
			     | USB_RECIP_INTERFACE
			     | USB_DIR_OUT, /* type */
			     bindex, /* value */
			     0, /* index */
			     NULL, /* &data */
			     0, /* size */
			     2000); /* timeout */
	if (rc < 0)
		return 0;

	return baud;
}

static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	int value;
	int result;

	if (break_state == -1)
		value = 1; /* start break */
	else
		value = 0; /* clear break */

	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			4, /* set break */
			USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
			value, 0, NULL, 0, 2000);
	if (result < 0)
		dev_dbg(&port->dev, "%s - error %d from usb_control_msg\n",
			__func__, result);
}

static void keyspan_pda_set_termios(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
{
	struct usb_serial *serial = port->serial;
	speed_t speed;

	/*
	 * cflag specifies lots of stuff: number of stop bits, parity, number
	 * of data bits, baud. What can the device actually handle?:
	 * CSTOPB (1 stop bit or 2)
	 * PARENB (parity)
	 * CSIZE (5bit .. 8bit)
	 * There is minimal hw support for parity (a PSW bit seems to hold the
	 * parity of whatever is in the accumulator). The UART either deals
	 * with 10 bits (start, 8 data, stop) or 11 bits (start, 8 data,
	 * 1 special, stop). So, with firmware changes, we could do:
	 * 8N1: 10 bit
	 * 8N2: 11 bit, extra bit always (mark?)
	 * 8[EOMS]1: 11 bit, extra bit is parity
	 * 7[EOMS]1: 10 bit, b0/b7 is parity
	 * 7[EOMS]2: 11 bit, b0/b7 is parity, extra bit always (mark?)
	 *
	 * HW flow control is dictated by the tty->termios.c_cflags & CRTSCTS
	 * bit.
	 *
	 * For now, just do baud.
	 */
	speed = tty_get_baud_rate(tty);
	speed = keyspan_pda_setbaud(serial, speed);

	if (speed == 0) {
		dev_dbg(&port->dev, "can't handle requested baud rate\n");
		/* It hasn't changed so.. */
		speed = tty_termios_baud_rate(old_termios);
	}
	/*
	 * Only speed can change so copy the old h/w parameters then encode
	 * the new speed.
	 */
	tty_termios_copy_hw(&tty->termios, old_termios);
	tty_encode_baud_rate(tty, speed, speed);
}

/*
 * Modem control pins: DTR and RTS are outputs and can be controlled.
 * DCD, RI, DSR, CTS are inputs and can be read. All outputs can also be
 * read. The byte passed is: DTR(b7) DCD RI DSR CTS RTS(b2) unused unused.
 */
static int keyspan_pda_get_modem_info(struct usb_serial *serial,
				      unsigned char *value)
{
	int rc;
	u8 *data;

	data = kmalloc(1, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			     3, /* get pins */
			     USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN,
			     0, 0, data, 1, 2000);
	if (rc == 1)
		*value = *data;
	else if (rc >= 0)
		rc = -EIO;

	kfree(data);
	return rc;
}

static int keyspan_pda_set_modem_info(struct usb_serial *serial,
				      unsigned char value)
{
	int rc;
	rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			     3, /* set pins */
			     USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_OUT,
			     value, 0, NULL, 0, 2000);
	return rc;
}

static int keyspan_pda_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	int rc;
	unsigned char status;
	int value;

	rc = keyspan_pda_get_modem_info(serial, &status);
	if (rc < 0)
		return rc;

	value = ((status & BIT(7)) ? TIOCM_DTR : 0) |
		((status & BIT(6)) ? TIOCM_CAR : 0) |
		((status & BIT(5)) ? TIOCM_RNG : 0) |
		((status & BIT(4)) ? TIOCM_DSR : 0) |
		((status & BIT(3)) ? TIOCM_CTS : 0) |
		((status & BIT(2)) ? TIOCM_RTS : 0);

	return value;
}

static int keyspan_pda_tiocmset(struct tty_struct *tty,
				unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	int rc;
	unsigned char status;

	rc = keyspan_pda_get_modem_info(serial, &status);
	if (rc < 0)
		return rc;

	if (set & TIOCM_RTS)
		status |= BIT(2);
	if (set & TIOCM_DTR)
		status |= BIT(7);

	if (clear & TIOCM_RTS)
		status &= ~BIT(2);
	if (clear & TIOCM_DTR)
		status &= ~BIT(7);
	rc = keyspan_pda_set_modem_info(serial, status);
	return rc;
}

static int keyspan_pda_write_start(struct usb_serial_port *port)
{
	struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	struct urb *urb;
	int count;
	int room;
	int rc;

	/*
	 * Guess how much room is left in the device's ring buffer. If our
	 * write will result in no room left, ask the device to give us an
	 * interrupt when the room available rises above a threshold but also
	 * query how much room is currently available (in case our guess was
	 * too conservative and the buffer is already empty when the
	 * unthrottle work is scheduled).
	 */

	/*
	 * We might block because of:
	 * the TX urb is in-flight (wait until it completes)
	 * the device is full (wait until it says there is room)
	 */
	spin_lock_irqsave(&port->lock, flags);

	room = priv->tx_room;
	count = kfifo_len(&port->write_fifo);

	if (!test_bit(0, &port->write_urbs_free) || count == 0 || room == 0) {
		spin_unlock_irqrestore(&port->lock, flags);
		return 0;
	}
	__clear_bit(0, &port->write_urbs_free);

	if (count > room)
		count = room;
	if (count > port->bulk_out_size)
		count = port->bulk_out_size;

	urb = port->write_urb;
	count = kfifo_out(&port->write_fifo, urb->transfer_buffer, count);
	urb->transfer_buffer_length = count;

	port->tx_bytes += count;
	priv->tx_room -= count;

	spin_unlock_irqrestore(&port->lock, flags);

	dev_dbg(&port->dev, "%s - count = %d, txroom = %d\n", __func__, count, room);

	rc = usb_submit_urb(urb, GFP_ATOMIC);
	if (rc) {
		dev_dbg(&port->dev, "usb_submit_urb(write bulk) failed\n");

		spin_lock_irqsave(&port->lock, flags);
		port->tx_bytes -= count;
		priv->tx_room = max(priv->tx_room, room + count);
		__set_bit(0, &port->write_urbs_free);
		spin_unlock_irqrestore(&port->lock, flags);

		return rc;
	}

	if (count == room)
		schedule_work(&priv->unthrottle_work);

	return count;
}

static void keyspan_pda_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	unsigned long flags;

	spin_lock_irqsave(&port->lock, flags);
	port->tx_bytes -= urb->transfer_buffer_length;
	__set_bit(0, &port->write_urbs_free);
	spin_unlock_irqrestore(&port->lock, flags);

	keyspan_pda_write_start(port);

	usb_serial_port_softint(port);
}

static int keyspan_pda_write(struct tty_struct *tty, struct usb_serial_port *port,
		const unsigned char *buf, int count)
{
	int rc;

	dev_dbg(&port->dev, "%s - count = %d\n", __func__, count);

	if (!count)
		return 0;

	count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);

	rc = keyspan_pda_write_start(port);
	if (rc)
		return rc;

	return count;
}

static void keyspan_pda_dtr_rts(struct usb_serial_port *port, int on)
{
	struct usb_serial *serial = port->serial;

	if (on)
		keyspan_pda_set_modem_info(serial, BIT(7) | BIT(2));
	else
		keyspan_pda_set_modem_info(serial, 0);
}


static int keyspan_pda_open(struct tty_struct *tty,
					struct usb_serial_port *port)
{
	struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
	int rc;

	/* find out how much room is in the Tx ring */
	rc = keyspan_pda_get_write_room(priv);
	if (rc < 0)
		return rc;

	spin_lock_irq(&port->lock);
	priv->tx_room = rc;
	spin_unlock_irq(&port->lock);

	rc = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (rc) {
		dev_dbg(&port->dev, "%s - usb_submit_urb(read int) failed\n", __func__);
		return rc;
	}

	return 0;
}

static void keyspan_pda_close(struct usb_serial_port *port)
{
	struct keyspan_pda_private *priv = usb_get_serial_port_data(port);

	/*
	 * Stop the interrupt URB first as its completion handler may submit
	 * the write URB.
	 */
	usb_kill_urb(port->interrupt_in_urb);
	usb_kill_urb(port->write_urb);

	cancel_work_sync(&priv->unthrottle_work);

	spin_lock_irq(&port->lock);
	kfifo_reset(&port->write_fifo);
	spin_unlock_irq(&port->lock);
}

/* download the firmware to a "fake" device (pre-renumeration) */
static int keyspan_pda_fake_startup(struct usb_serial *serial)
{
	unsigned int vid = le16_to_cpu(serial->dev->descriptor.idVendor);
	const char *fw_name;

	/* download the firmware here ... */
	ezusb_fx1_set_reset(serial->dev, 1);

	switch (vid) {
	case KEYSPAN_VENDOR_ID:
		fw_name = "keyspan_pda/keyspan_pda.fw";
		break;
	case XIRCOM_VENDOR_ID:
	case ENTREGA_VENDOR_ID:
		fw_name = "keyspan_pda/xircom_pgs.fw";
		break;
	default:
		dev_err(&serial->dev->dev, "%s: unknown vendor, aborting.\n",
			__func__);
		return -ENODEV;
	}

	if (ezusb_fx1_ihex_firmware_download(serial->dev, fw_name) < 0) {
		dev_err(&serial->dev->dev, "failed to load firmware \"%s\"\n",
			fw_name);
		return -ENOENT;
	}

	/*
	 * After downloading firmware renumeration will occur in a moment and
	 * the new device will bind to the real driver.
	 */

	/* We want this device to fail to have a driver assigned to it. */
	return 1;
}

MODULE_FIRMWARE("keyspan_pda/keyspan_pda.fw");
MODULE_FIRMWARE("keyspan_pda/xircom_pgs.fw");

static int keyspan_pda_port_probe(struct usb_serial_port *port)
{

	struct keyspan_pda_private *priv;

	priv = kmalloc(sizeof(struct keyspan_pda_private), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	INIT_WORK(&priv->unthrottle_work, keyspan_pda_request_unthrottle);
	priv->port = port;

	usb_set_serial_port_data(port, priv);

	return 0;
}

static int keyspan_pda_port_remove(struct usb_serial_port *port)
{
	struct keyspan_pda_private *priv;

	priv = usb_get_serial_port_data(port);
	kfree(priv);

	return 0;
}

static struct usb_serial_driver keyspan_pda_fake_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"keyspan_pda_pre",
	},
	.description =		"Keyspan PDA - (prerenumeration)",
	.id_table =		id_table_fake,
	.num_ports =		1,
	.attach =		keyspan_pda_fake_startup,
};

static struct usb_serial_driver keyspan_pda_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"keyspan_pda",
	},
	.description =		"Keyspan PDA",
	.id_table =		id_table_std,
	.num_ports =		1,
	.num_bulk_out =		1,
	.num_interrupt_in =	1,
	.dtr_rts =		keyspan_pda_dtr_rts,
	.open =			keyspan_pda_open,
	.close =		keyspan_pda_close,
	.write =		keyspan_pda_write,
	.write_bulk_callback =	keyspan_pda_write_bulk_callback,
	.read_int_callback =	keyspan_pda_rx_interrupt,
	.throttle =		keyspan_pda_rx_throttle,
	.unthrottle =		keyspan_pda_rx_unthrottle,
	.set_termios =		keyspan_pda_set_termios,
	.break_ctl =		keyspan_pda_break_ctl,
	.tiocmget =		keyspan_pda_tiocmget,
	.tiocmset =		keyspan_pda_tiocmset,
	.port_probe =		keyspan_pda_port_probe,
	.port_remove =		keyspan_pda_port_remove,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&keyspan_pda_device,
	&keyspan_pda_fake_device,
	NULL
};

module_usb_serial_driver(serial_drivers, id_table_combined);

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