summaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/keyspan_pda.c
blob: dd97d8b572c336e03c7c4c282fbe7e38c44646a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
/*
 * 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>
 *
 *	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.
 *
 * See Documentation/usb/usb-serial.txt 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>

/* make a simple define to handle if we are compiling keyspan_pda or xircom support */
#if defined(CONFIG_USB_SERIAL_KEYSPAN_PDA) || defined(CONFIG_USB_SERIAL_KEYSPAN_PDA_MODULE)
	#define KEYSPAN
#else
	#undef KEYSPAN
#endif
#if defined(CONFIG_USB_SERIAL_XIRCOM) || defined(CONFIG_USB_SERIAL_XIRCOM_MODULE)
	#define XIRCOM
#else
	#undef XIRCOM
#endif

#define DRIVER_AUTHOR "Brian Warner <warner@lothar.com>"
#define DRIVER_DESC "USB Keyspan PDA Converter driver"

struct keyspan_pda_private {
	int			tx_room;
	int			tx_throttled;
	struct work_struct			wakeup_work;
	struct work_struct			unthrottle_work;
	struct usb_serial	*serial;
	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 ENTREGA_VENDOR_ID		0x1645
#define ENTREGA_FAKE_ID			0x8093

static const struct usb_device_id id_table_combined[] = {
#ifdef KEYSPAN
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
#endif
#ifdef XIRCOM
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
	{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
#endif
	{ 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 */
};

#ifdef KEYSPAN
static const struct usb_device_id id_table_fake[] = {
	{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
	{ }						/* Terminating entry */
};
#endif

#ifdef XIRCOM
static const struct usb_device_id id_table_fake_xircom[] = {
	{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
	{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
	{ }
};
#endif

static void keyspan_pda_wakeup_write(struct work_struct *work)
{
	struct keyspan_pda_private *priv =
		container_of(work, struct keyspan_pda_private, wakeup_work);
	struct usb_serial_port *port = priv->port;

	tty_port_tty_wakeup(&port->port);
}

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 *serial = priv->serial;
	int result;

	/* 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,
				 16, /* value: threshold */
				 0, /* index */
				 NULL,
				 0,
				 2000);
	if (result < 0)
		dev_dbg(&serial->dev->dev, "%s - error %d from usb_control_msg\n",
			__func__, result);
}


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

	/* see if the message is data or a status interrupt */
	switch (data[0]) {
	case 0:
		 /* rest of message is rx data */
		if (urb->actual_length) {
			tty_insert_flip_string(&port->port, data + 1,
						urb->actual_length - 1);
			tty_flip_buffer_push(&port->port);
		}
		break;
	case 1:
		/* status interrupt */
		dev_dbg(&port->dev, "rx int, d1=%d, d2=%d\n", data[1], data[2]);
		switch (data[1]) {
		case 1: /* modemline change */
			break;
		case 2: /* tx unthrottle interrupt */
			priv->tx_throttled = 0;
			/* queue up a wakeup at scheduler time */
			schedule_work(&priv->wakeup_work);
			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)
{
	/* 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. */
	struct usb_serial_port *port = tty->driver_data;

	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;
	}

	/* rather than figure out how to sleep while waiting for this
	   to complete, I just use the "legacy" API. */
	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);
	/* there is something funky about this.. the TCSBRK that 'cu' performs
	   ought to translate into a break_ctl(-1),break_ctl(0) pair HZ/4
	   seconds apart, but it feels like the break sent isn't as long as it
	   is on /dev/ttyS0 */
}


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 >= 0)
		*value = *data;

	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 & (1<<7)) ? TIOCM_DTR : 0) |
		((status & (1<<6)) ? TIOCM_CAR : 0) |
		((status & (1<<5)) ? TIOCM_RNG : 0) |
		((status & (1<<4)) ? TIOCM_DSR : 0) |
		((status & (1<<3)) ? TIOCM_CTS : 0) |
		((status & (1<<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 |= (1<<2);
	if (set & TIOCM_DTR)
		status |= (1<<7);

	if (clear & TIOCM_RTS)
		status &= ~(1<<2);
	if (clear & TIOCM_DTR)
		status &= ~(1<<7);
	rc = keyspan_pda_set_modem_info(serial, status);
	return rc;
}

static int keyspan_pda_write(struct tty_struct *tty,
	struct usb_serial_port *port, const unsigned char *buf, int count)
{
	struct usb_serial *serial = port->serial;
	int request_unthrottle = 0;
	int rc = 0;
	struct keyspan_pda_private *priv;

	priv = usb_get_serial_port_data(port);
	/* guess how much room is left in the device's ring buffer, and if we
	   want to send more than that, check first, updating our notion of
	   what is left. 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, and hold off all writers (eventually, those using
	   select() or poll() too) until we receive that unthrottle interrupt.
	   Block if we can't write anything at all, otherwise write as much as
	   we can. */
	if (count == 0) {
		dev_dbg(&port->dev, "write request of 0 bytes\n");
		return 0;
	}

	/* 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_bh(&port->lock);
	if (!test_bit(0, &port->write_urbs_free) || priv->tx_throttled) {
		spin_unlock_bh(&port->lock);
		return 0;
	}
	clear_bit(0, &port->write_urbs_free);
	spin_unlock_bh(&port->lock);

	/* At this point the URB is in our control, nobody else can submit it
	   again (the only sudden transition was the one from EINPROGRESS to
	   finished).  Also, the tx process is not throttled. So we are
	   ready to write. */

	count = (count > port->bulk_out_size) ? port->bulk_out_size : count;

	/* Check if we might overrun the Tx buffer.   If so, ask the
	   device how much room it really has.  This is done only on
	   scheduler time, since usb_control_msg() sleeps. */
	if (count > priv->tx_room && !in_interrupt()) {
		u8 *room;

		room = kmalloc(1, GFP_KERNEL);
		if (!room) {
			rc = -ENOMEM;
			goto exit;
		}

		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 > 0) {
			dev_dbg(&port->dev, "roomquery says %d\n", *room);
			priv->tx_room = *room;
		}
		kfree(room);
		if (rc < 0) {
			dev_dbg(&port->dev, "roomquery failed\n");
			goto exit;
		}
		if (rc == 0) {
			dev_dbg(&port->dev, "roomquery returned 0 bytes\n");
			rc = -EIO; /* device didn't return any data */
			goto exit;
		}
	}
	if (count > priv->tx_room) {
		/* we're about to completely fill the Tx buffer, so
		   we'll be throttled afterwards. */
		count = priv->tx_room;
		request_unthrottle = 1;
	}

	if (count) {
		/* now transfer data */
		memcpy(port->write_urb->transfer_buffer, buf, count);
		/* send the data out the bulk port */
		port->write_urb->transfer_buffer_length = count;

		priv->tx_room -= count;

		rc = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (rc) {
			dev_dbg(&port->dev, "usb_submit_urb(write bulk) failed\n");
			goto exit;
		}
	} else {
		/* There wasn't any room left, so we are throttled until
		   the buffer empties a bit */
		request_unthrottle = 1;
	}

	if (request_unthrottle) {
		priv->tx_throttled = 1; /* block writers */
		schedule_work(&priv->unthrottle_work);
	}

	rc = count;
exit:
	if (rc < 0)
		set_bit(0, &port->write_urbs_free);
	return rc;
}


static void keyspan_pda_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct keyspan_pda_private *priv;

	set_bit(0, &port->write_urbs_free);
	priv = usb_get_serial_port_data(port);

	/* queue up a wakeup at scheduler time */
	schedule_work(&priv->wakeup_work);
}


static int keyspan_pda_write_room(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct keyspan_pda_private *priv;
	priv = usb_get_serial_port_data(port);
	/* used by n_tty.c for processing of tabs and such. Giving it our
	   conservative guess is probably good enough, but needs testing by
	   running a console through the device. */
	return priv->tx_room;
}


static int keyspan_pda_chars_in_buffer(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct keyspan_pda_private *priv;
	unsigned long flags;
	int ret = 0;

	priv = usb_get_serial_port_data(port);

	/* when throttled, return at least WAKEUP_CHARS to tell select() (via
	   n_tty.c:normal_poll() ) that we're not writeable. */

	spin_lock_irqsave(&port->lock, flags);
	if (!test_bit(0, &port->write_urbs_free) || priv->tx_throttled)
		ret = 256;
	spin_unlock_irqrestore(&port->lock, flags);
	return ret;
}


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, (1 << 7) | (1 << 2));
	else
		keyspan_pda_set_modem_info(serial, 0);
}


static int keyspan_pda_open(struct tty_struct *tty,
					struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	u8 *room;
	int rc = 0;
	struct keyspan_pda_private *priv;

	/* find out how much room is in the Tx ring */
	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, /* index */
			     room,
			     1,
			     2000);
	if (rc < 0) {
		dev_dbg(&port->dev, "%s - roomquery failed\n", __func__);
		goto error;
	}
	if (rc == 0) {
		dev_dbg(&port->dev, "%s - roomquery returned 0 bytes\n", __func__);
		rc = -EIO;
		goto error;
	}
	priv = usb_get_serial_port_data(port);
	priv->tx_room = *room;
	priv->tx_throttled = *room ? 0 : 1;

	/*Start reading from the device*/
	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__);
		goto error;
	}
error:
	kfree(room);
	return rc;
}
static void keyspan_pda_close(struct usb_serial_port *port)
{
	usb_kill_urb(port->write_urb);
	usb_kill_urb(port->interrupt_in_urb);
}


/* download the firmware to a "fake" device (pre-renumeration) */
static int keyspan_pda_fake_startup(struct usb_serial *serial)
{
	int response;
	const char *fw_name;

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

	if (0) { ; }
#ifdef KEYSPAN
	else if (le16_to_cpu(serial->dev->descriptor.idVendor) == KEYSPAN_VENDOR_ID)
		fw_name = "keyspan_pda/keyspan_pda.fw";
#endif
#ifdef XIRCOM
	else if ((le16_to_cpu(serial->dev->descriptor.idVendor) == XIRCOM_VENDOR_ID) ||
		 (le16_to_cpu(serial->dev->descriptor.idVendor) == ENTREGA_VENDOR_ID))
		fw_name = "keyspan_pda/xircom_pgs.fw";
#endif
	else {
		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;
}

#ifdef KEYSPAN
MODULE_FIRMWARE("keyspan_pda/keyspan_pda.fw");
#endif
#ifdef XIRCOM
MODULE_FIRMWARE("keyspan_pda/xircom_pgs.fw");
#endif

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->wakeup_work, keyspan_pda_wakeup_write);
	INIT_WORK(&priv->unthrottle_work, keyspan_pda_request_unthrottle);
	priv->serial = port->serial;
	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;
}

#ifdef KEYSPAN
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,
};
#endif

#ifdef XIRCOM
static struct usb_serial_driver xircom_pgs_fake_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"xircom_no_firm",
	},
	.description =		"Xircom / Entrega PGS - (prerenumeration)",
	.id_table =		id_table_fake_xircom,
	.num_ports =		1,
	.attach =		keyspan_pda_fake_startup,
};
#endif

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,
	.dtr_rts =		keyspan_pda_dtr_rts,
	.open =			keyspan_pda_open,
	.close =		keyspan_pda_close,
	.write =		keyspan_pda_write,
	.write_room =		keyspan_pda_write_room,
	.write_bulk_callback = 	keyspan_pda_write_bulk_callback,
	.read_int_callback =	keyspan_pda_rx_interrupt,
	.chars_in_buffer =	keyspan_pda_chars_in_buffer,
	.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,
#ifdef KEYSPAN
	&keyspan_pda_fake_device,
#endif
#ifdef XIRCOM
	&xircom_pgs_fake_device,
#endif
	NULL
};

module_usb_serial_driver(serial_drivers, id_table_combined);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud