summaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/whiteheat.c
blob: d3ea90bef84d98a67f110f6040ca70ec12b7a5fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
/*
 * USB ConnectTech WhiteHEAT driver
 *
 *	Copyright (C) 2002
 *	    Connect Tech Inc.
 *
 *	Copyright (C) 1999 - 2001
 *	    Greg Kroah-Hartman (greg@kroah.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/mutex.h>
#include <linux/uaccess.h>
#include <asm/termbits.h>
#include <linux/usb.h>
#include <linux/serial_reg.h>
#include <linux/serial.h>
#include <linux/usb/serial.h>
#include <linux/usb/ezusb.h>
#include "whiteheat.h"			/* WhiteHEAT specific commands */

#ifndef CMSPAR
#define CMSPAR 0
#endif

/*
 * Version Information
 */
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Stuart MacDonald <stuartm@connecttech.com>"
#define DRIVER_DESC "USB ConnectTech WhiteHEAT driver"

#define CONNECT_TECH_VENDOR_ID		0x0710
#define CONNECT_TECH_FAKE_WHITE_HEAT_ID	0x0001
#define CONNECT_TECH_WHITE_HEAT_ID	0x8001

/*
   ID tables for whiteheat are unusual, because we want to different
   things for different versions of the device.  Eventually, this
   will be doable from a single table.  But, for now, we define two
   separate ID tables, and then a third table that combines them
   just for the purpose of exporting the autoloading information.
*/
static const struct usb_device_id id_table_std[] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

static const struct usb_device_id id_table_prerenumeration[] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

static const struct usb_device_id id_table_combined[] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table_combined);


/* function prototypes for the Connect Tech WhiteHEAT prerenumeration device */
static int  whiteheat_firmware_download(struct usb_serial *serial,
					const struct usb_device_id *id);
static int  whiteheat_firmware_attach(struct usb_serial *serial);

/* function prototypes for the Connect Tech WhiteHEAT serial converter */
static int whiteheat_probe(struct usb_serial *serial,
				const struct usb_device_id *id);
static int  whiteheat_attach(struct usb_serial *serial);
static void whiteheat_release(struct usb_serial *serial);
static int  whiteheat_port_probe(struct usb_serial_port *port);
static int  whiteheat_port_remove(struct usb_serial_port *port);
static int  whiteheat_open(struct tty_struct *tty,
			struct usb_serial_port *port);
static void whiteheat_close(struct usb_serial_port *port);
static int  whiteheat_ioctl(struct tty_struct *tty,
			unsigned int cmd, unsigned long arg);
static void whiteheat_set_termios(struct tty_struct *tty,
			struct usb_serial_port *port, struct ktermios *old);
static int  whiteheat_tiocmget(struct tty_struct *tty);
static int  whiteheat_tiocmset(struct tty_struct *tty,
			unsigned int set, unsigned int clear);
static void whiteheat_break_ctl(struct tty_struct *tty, int break_state);

static struct usb_serial_driver whiteheat_fake_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"whiteheatnofirm",
	},
	.description =		"Connect Tech - WhiteHEAT - (prerenumeration)",
	.id_table =		id_table_prerenumeration,
	.num_ports =		1,
	.probe =		whiteheat_firmware_download,
	.attach =		whiteheat_firmware_attach,
};

static struct usb_serial_driver whiteheat_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"whiteheat",
	},
	.description =		"Connect Tech - WhiteHEAT",
	.id_table =		id_table_std,
	.num_ports =		4,
	.probe =		whiteheat_probe,
	.attach =		whiteheat_attach,
	.release =		whiteheat_release,
	.port_probe =		whiteheat_port_probe,
	.port_remove =		whiteheat_port_remove,
	.open =			whiteheat_open,
	.close =		whiteheat_close,
	.ioctl =		whiteheat_ioctl,
	.set_termios =		whiteheat_set_termios,
	.break_ctl =		whiteheat_break_ctl,
	.tiocmget =		whiteheat_tiocmget,
	.tiocmset =		whiteheat_tiocmset,
	.throttle =		usb_serial_generic_throttle,
	.unthrottle =		usb_serial_generic_unthrottle,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&whiteheat_fake_device, &whiteheat_device, NULL
};

struct whiteheat_command_private {
	struct mutex		mutex;
	__u8			port_running;
	__u8			command_finished;
	wait_queue_head_t	wait_command; /* for handling sleeping whilst
						 waiting for a command to
						 finish */
	__u8			result_buffer[64];
};

struct whiteheat_private {
	__u8			mcr;		/* FIXME: no locking on mcr */
};


/* local function prototypes */
static int start_command_port(struct usb_serial *serial);
static void stop_command_port(struct usb_serial *serial);
static void command_port_write_callback(struct urb *urb);
static void command_port_read_callback(struct urb *urb);

static int firm_send_command(struct usb_serial_port *port, __u8 command,
						__u8 *data, __u8 datasize);
static int firm_open(struct usb_serial_port *port);
static int firm_close(struct usb_serial_port *port);
static void firm_setup_port(struct tty_struct *tty);
static int firm_set_rts(struct usb_serial_port *port, __u8 onoff);
static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff);
static int firm_set_break(struct usb_serial_port *port, __u8 onoff);
static int firm_purge(struct usb_serial_port *port, __u8 rxtx);
static int firm_get_dtr_rts(struct usb_serial_port *port);
static int firm_report_tx_done(struct usb_serial_port *port);


#define COMMAND_PORT		4
#define COMMAND_TIMEOUT		(2*HZ)	/* 2 second timeout for a command */
#define	COMMAND_TIMEOUT_MS	2000
#define CLOSING_DELAY		(30 * HZ)


/*****************************************************************************
 * Connect Tech's White Heat prerenumeration driver functions
 *****************************************************************************/

/* steps to download the firmware to the WhiteHEAT device:
 - hold the reset (by writing to the reset bit of the CPUCS register)
 - download the VEND_AX.HEX file to the chip using VENDOR_REQUEST-ANCHOR_LOAD
 - release the reset (by writing to the CPUCS register)
 - download the WH.HEX file for all addresses greater than 0x1b3f using
   VENDOR_REQUEST-ANCHOR_EXTERNAL_RAM_LOAD
 - hold the reset
 - download the WH.HEX file for all addresses less than 0x1b40 using
   VENDOR_REQUEST_ANCHOR_LOAD
 - release the reset
 - device renumerated itself and comes up as new device id with all
   firmware download completed.
*/
static int whiteheat_firmware_download(struct usb_serial *serial,
					const struct usb_device_id *id)
{
	int response;

	response = ezusb_fx1_ihex_firmware_download(serial->dev, "whiteheat_loader.fw");
	if (response >= 0) {
		response = ezusb_fx1_ihex_firmware_download(serial->dev, "whiteheat.fw");
		if (response >= 0)
			return 0;
	}
	return -ENOENT;
}


static int whiteheat_firmware_attach(struct usb_serial *serial)
{
	/* We want this device to fail to have a driver assigned to it */
	return 1;
}


/*****************************************************************************
 * Connect Tech's White Heat serial driver functions
 *****************************************************************************/

static int whiteheat_probe(struct usb_serial *serial,
				const struct usb_device_id *id)
{
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	size_t num_bulk_in = 0;
	size_t num_bulk_out = 0;
	size_t min_num_bulk;
	unsigned int i;

	iface_desc = serial->interface->cur_altsetting;

	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (usb_endpoint_is_bulk_in(endpoint))
			++num_bulk_in;
		if (usb_endpoint_is_bulk_out(endpoint))
			++num_bulk_out;
	}

	min_num_bulk = COMMAND_PORT + 1;
	if (num_bulk_in < min_num_bulk || num_bulk_out < min_num_bulk)
		return -ENODEV;

	return 0;
}

static int whiteheat_attach(struct usb_serial *serial)
{
	struct usb_serial_port *command_port;
	struct whiteheat_command_private *command_info;
	struct whiteheat_hw_info *hw_info;
	int pipe;
	int ret;
	int alen;
	__u8 *command;
	__u8 *result;

	command_port = serial->port[COMMAND_PORT];

	pipe = usb_sndbulkpipe(serial->dev,
			command_port->bulk_out_endpointAddress);
	command = kmalloc(2, GFP_KERNEL);
	if (!command)
		goto no_command_buffer;
	command[0] = WHITEHEAT_GET_HW_INFO;
	command[1] = 0;

	result = kmalloc(sizeof(*hw_info) + 1, GFP_KERNEL);
	if (!result)
		goto no_result_buffer;
	/*
	 * When the module is reloaded the firmware is still there and
	 * the endpoints are still in the usb core unchanged. This is the
	 * unlinking bug in disguise. Same for the call below.
	 */
	usb_clear_halt(serial->dev, pipe);
	ret = usb_bulk_msg(serial->dev, pipe, command, 2,
						&alen, COMMAND_TIMEOUT_MS);
	if (ret) {
		dev_err(&serial->dev->dev, "%s: Couldn't send command [%d]\n",
			serial->type->description, ret);
		goto no_firmware;
	} else if (alen != 2) {
		dev_err(&serial->dev->dev, "%s: Send command incomplete [%d]\n",
			serial->type->description, alen);
		goto no_firmware;
	}

	pipe = usb_rcvbulkpipe(serial->dev,
				command_port->bulk_in_endpointAddress);
	/* See the comment on the usb_clear_halt() above */
	usb_clear_halt(serial->dev, pipe);
	ret = usb_bulk_msg(serial->dev, pipe, result,
			sizeof(*hw_info) + 1, &alen, COMMAND_TIMEOUT_MS);
	if (ret) {
		dev_err(&serial->dev->dev, "%s: Couldn't get results [%d]\n",
			serial->type->description, ret);
		goto no_firmware;
	} else if (alen != sizeof(*hw_info) + 1) {
		dev_err(&serial->dev->dev, "%s: Get results incomplete [%d]\n",
			serial->type->description, alen);
		goto no_firmware;
	} else if (result[0] != command[0]) {
		dev_err(&serial->dev->dev, "%s: Command failed [%d]\n",
			serial->type->description, result[0]);
		goto no_firmware;
	}

	hw_info = (struct whiteheat_hw_info *)&result[1];

	dev_info(&serial->dev->dev, "%s: Firmware v%d.%02d\n",
		 serial->type->description,
		 hw_info->sw_major_rev, hw_info->sw_minor_rev);

	command_info = kmalloc(sizeof(struct whiteheat_command_private),
								GFP_KERNEL);
	if (!command_info)
		goto no_command_private;

	mutex_init(&command_info->mutex);
	command_info->port_running = 0;
	init_waitqueue_head(&command_info->wait_command);
	usb_set_serial_port_data(command_port, command_info);
	command_port->write_urb->complete = command_port_write_callback;
	command_port->read_urb->complete = command_port_read_callback;
	kfree(result);
	kfree(command);

	return 0;

no_firmware:
	/* Firmware likely not running */
	dev_err(&serial->dev->dev,
		"%s: Unable to retrieve firmware version, try replugging\n",
		serial->type->description);
	dev_err(&serial->dev->dev,
		"%s: If the firmware is not running (status led not blinking)\n",
		serial->type->description);
	dev_err(&serial->dev->dev,
		"%s: please contact support@connecttech.com\n",
		serial->type->description);
	kfree(result);
	kfree(command);
	return -ENODEV;

no_command_private:
	kfree(result);
no_result_buffer:
	kfree(command);
no_command_buffer:
	return -ENOMEM;
}

static void whiteheat_release(struct usb_serial *serial)
{
	struct usb_serial_port *command_port;

	/* free up our private data for our command port */
	command_port = serial->port[COMMAND_PORT];
	kfree(usb_get_serial_port_data(command_port));
}

static int whiteheat_port_probe(struct usb_serial_port *port)
{
	struct whiteheat_private *info;

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

	usb_set_serial_port_data(port, info);

	return 0;
}

static int whiteheat_port_remove(struct usb_serial_port *port)
{
	struct whiteheat_private *info;

	info = usb_get_serial_port_data(port);
	kfree(info);

	return 0;
}

static int whiteheat_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	int retval;

	retval = start_command_port(port->serial);
	if (retval)
		goto exit;

	/* send an open port command */
	retval = firm_open(port);
	if (retval) {
		stop_command_port(port->serial);
		goto exit;
	}

	retval = firm_purge(port, WHITEHEAT_PURGE_RX | WHITEHEAT_PURGE_TX);
	if (retval) {
		firm_close(port);
		stop_command_port(port->serial);
		goto exit;
	}

	if (tty)
		firm_setup_port(tty);

	/* Work around HCD bugs */
	usb_clear_halt(port->serial->dev, port->read_urb->pipe);
	usb_clear_halt(port->serial->dev, port->write_urb->pipe);

	retval = usb_serial_generic_open(tty, port);
	if (retval) {
		firm_close(port);
		stop_command_port(port->serial);
		goto exit;
	}
exit:
	return retval;
}


static void whiteheat_close(struct usb_serial_port *port)
{
	firm_report_tx_done(port);
	firm_close(port);

	usb_serial_generic_close(port);

	stop_command_port(port->serial);
}

static int whiteheat_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct whiteheat_private *info = usb_get_serial_port_data(port);
	unsigned int modem_signals = 0;

	firm_get_dtr_rts(port);
	if (info->mcr & UART_MCR_DTR)
		modem_signals |= TIOCM_DTR;
	if (info->mcr & UART_MCR_RTS)
		modem_signals |= TIOCM_RTS;

	return modem_signals;
}

static int whiteheat_tiocmset(struct tty_struct *tty,
			       unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct whiteheat_private *info = usb_get_serial_port_data(port);

	if (set & TIOCM_RTS)
		info->mcr |= UART_MCR_RTS;
	if (set & TIOCM_DTR)
		info->mcr |= UART_MCR_DTR;

	if (clear & TIOCM_RTS)
		info->mcr &= ~UART_MCR_RTS;
	if (clear & TIOCM_DTR)
		info->mcr &= ~UART_MCR_DTR;

	firm_set_dtr(port, info->mcr & UART_MCR_DTR);
	firm_set_rts(port, info->mcr & UART_MCR_RTS);
	return 0;
}


static int whiteheat_ioctl(struct tty_struct *tty,
					unsigned int cmd, unsigned long arg)
{
	struct usb_serial_port *port = tty->driver_data;
	struct serial_struct serstruct;
	void __user *user_arg = (void __user *)arg;

	switch (cmd) {
	case TIOCGSERIAL:
		memset(&serstruct, 0, sizeof(serstruct));
		serstruct.type = PORT_16654;
		serstruct.line = port->minor;
		serstruct.port = port->port_number;
		serstruct.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
		serstruct.xmit_fifo_size = kfifo_size(&port->write_fifo);
		serstruct.custom_divisor = 0;
		serstruct.baud_base = 460800;
		serstruct.close_delay = CLOSING_DELAY;
		serstruct.closing_wait = CLOSING_DELAY;

		if (copy_to_user(user_arg, &serstruct, sizeof(serstruct)))
			return -EFAULT;
		break;
	default:
		break;
	}

	return -ENOIOCTLCMD;
}


static void whiteheat_set_termios(struct tty_struct *tty,
	struct usb_serial_port *port, struct ktermios *old_termios)
{
	firm_setup_port(tty);
}

static void whiteheat_break_ctl(struct tty_struct *tty, int break_state)
{
	struct usb_serial_port *port = tty->driver_data;
	firm_set_break(port, break_state);
}


/*****************************************************************************
 * Connect Tech's White Heat callback routines
 *****************************************************************************/
static void command_port_write_callback(struct urb *urb)
{
	int status = urb->status;

	if (status) {
		dev_dbg(&urb->dev->dev, "nonzero urb status: %d\n", status);
		return;
	}
}


static void command_port_read_callback(struct urb *urb)
{
	struct usb_serial_port *command_port = urb->context;
	struct whiteheat_command_private *command_info;
	int status = urb->status;
	unsigned char *data = urb->transfer_buffer;
	int result;

	command_info = usb_get_serial_port_data(command_port);
	if (!command_info) {
		dev_dbg(&urb->dev->dev, "%s - command_info is NULL, exiting.\n", __func__);
		return;
	}
	if (!urb->actual_length) {
		dev_dbg(&urb->dev->dev, "%s - empty response, exiting.\n", __func__);
		return;
	}
	if (status) {
		dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", __func__, status);
		if (status != -ENOENT)
			command_info->command_finished = WHITEHEAT_CMD_FAILURE;
		wake_up(&command_info->wait_command);
		return;
	}

	usb_serial_debug_data(&command_port->dev, __func__, urb->actual_length, data);

	if (data[0] == WHITEHEAT_CMD_COMPLETE) {
		command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
		wake_up(&command_info->wait_command);
	} else if (data[0] == WHITEHEAT_CMD_FAILURE) {
		command_info->command_finished = WHITEHEAT_CMD_FAILURE;
		wake_up(&command_info->wait_command);
	} else if (data[0] == WHITEHEAT_EVENT) {
		/* These are unsolicited reports from the firmware, hence no
		   waiting command to wakeup */
		dev_dbg(&urb->dev->dev, "%s - event received\n", __func__);
	} else if ((data[0] == WHITEHEAT_GET_DTR_RTS) &&
		(urb->actual_length - 1 <= sizeof(command_info->result_buffer))) {
		memcpy(command_info->result_buffer, &data[1],
						urb->actual_length - 1);
		command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
		wake_up(&command_info->wait_command);
	} else
		dev_dbg(&urb->dev->dev, "%s - bad reply from firmware\n", __func__);

	/* Continue trying to always read */
	result = usb_submit_urb(command_port->read_urb, GFP_ATOMIC);
	if (result)
		dev_dbg(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n",
			__func__, result);
}


/*****************************************************************************
 * Connect Tech's White Heat firmware interface
 *****************************************************************************/
static int firm_send_command(struct usb_serial_port *port, __u8 command,
						__u8 *data, __u8 datasize)
{
	struct usb_serial_port *command_port;
	struct whiteheat_command_private *command_info;
	struct whiteheat_private *info;
	struct device *dev = &port->dev;
	__u8 *transfer_buffer;
	int retval = 0;
	int t;

	dev_dbg(dev, "%s - command %d\n", __func__, command);

	command_port = port->serial->port[COMMAND_PORT];
	command_info = usb_get_serial_port_data(command_port);
	mutex_lock(&command_info->mutex);
	command_info->command_finished = false;

	transfer_buffer = (__u8 *)command_port->write_urb->transfer_buffer;
	transfer_buffer[0] = command;
	memcpy(&transfer_buffer[1], data, datasize);
	command_port->write_urb->transfer_buffer_length = datasize + 1;
	retval = usb_submit_urb(command_port->write_urb, GFP_NOIO);
	if (retval) {
		dev_dbg(dev, "%s - submit urb failed\n", __func__);
		goto exit;
	}

	/* wait for the command to complete */
	t = wait_event_timeout(command_info->wait_command,
		(bool)command_info->command_finished, COMMAND_TIMEOUT);
	if (!t)
		usb_kill_urb(command_port->write_urb);

	if (command_info->command_finished == false) {
		dev_dbg(dev, "%s - command timed out.\n", __func__);
		retval = -ETIMEDOUT;
		goto exit;
	}

	if (command_info->command_finished == WHITEHEAT_CMD_FAILURE) {
		dev_dbg(dev, "%s - command failed.\n", __func__);
		retval = -EIO;
		goto exit;
	}

	if (command_info->command_finished == WHITEHEAT_CMD_COMPLETE) {
		dev_dbg(dev, "%s - command completed.\n", __func__);
		switch (command) {
		case WHITEHEAT_GET_DTR_RTS:
			info = usb_get_serial_port_data(port);
			memcpy(&info->mcr, command_info->result_buffer,
					sizeof(struct whiteheat_dr_info));
				break;
		}
	}
exit:
	mutex_unlock(&command_info->mutex);
	return retval;
}


static int firm_open(struct usb_serial_port *port)
{
	struct whiteheat_simple open_command;

	open_command.port = port->port_number + 1;
	return firm_send_command(port, WHITEHEAT_OPEN,
		(__u8 *)&open_command, sizeof(open_command));
}


static int firm_close(struct usb_serial_port *port)
{
	struct whiteheat_simple close_command;

	close_command.port = port->port_number + 1;
	return firm_send_command(port, WHITEHEAT_CLOSE,
			(__u8 *)&close_command, sizeof(close_command));
}


static void firm_setup_port(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct device *dev = &port->dev;
	struct whiteheat_port_settings port_settings;
	unsigned int cflag = tty->termios.c_cflag;

	port_settings.port = port->port_number + 1;

	/* get the byte size */
	switch (cflag & CSIZE) {
	case CS5:	port_settings.bits = 5;   break;
	case CS6:	port_settings.bits = 6;   break;
	case CS7:	port_settings.bits = 7;   break;
	default:
	case CS8:	port_settings.bits = 8;   break;
	}
	dev_dbg(dev, "%s - data bits = %d\n", __func__, port_settings.bits);

	/* determine the parity */
	if (cflag & PARENB)
		if (cflag & CMSPAR)
			if (cflag & PARODD)
				port_settings.parity = WHITEHEAT_PAR_MARK;
			else
				port_settings.parity = WHITEHEAT_PAR_SPACE;
		else
			if (cflag & PARODD)
				port_settings.parity = WHITEHEAT_PAR_ODD;
			else
				port_settings.parity = WHITEHEAT_PAR_EVEN;
	else
		port_settings.parity = WHITEHEAT_PAR_NONE;
	dev_dbg(dev, "%s - parity = %c\n", __func__, port_settings.parity);

	/* figure out the stop bits requested */
	if (cflag & CSTOPB)
		port_settings.stop = 2;
	else
		port_settings.stop = 1;
	dev_dbg(dev, "%s - stop bits = %d\n", __func__, port_settings.stop);

	/* figure out the flow control settings */
	if (cflag & CRTSCTS)
		port_settings.hflow = (WHITEHEAT_HFLOW_CTS |
						WHITEHEAT_HFLOW_RTS);
	else
		port_settings.hflow = WHITEHEAT_HFLOW_NONE;
	dev_dbg(dev, "%s - hardware flow control = %s %s %s %s\n", __func__,
	    (port_settings.hflow & WHITEHEAT_HFLOW_CTS) ? "CTS" : "",
	    (port_settings.hflow & WHITEHEAT_HFLOW_RTS) ? "RTS" : "",
	    (port_settings.hflow & WHITEHEAT_HFLOW_DSR) ? "DSR" : "",
	    (port_settings.hflow & WHITEHEAT_HFLOW_DTR) ? "DTR" : "");

	/* determine software flow control */
	if (I_IXOFF(tty))
		port_settings.sflow = WHITEHEAT_SFLOW_RXTX;
	else
		port_settings.sflow = WHITEHEAT_SFLOW_NONE;
	dev_dbg(dev, "%s - software flow control = %c\n", __func__, port_settings.sflow);

	port_settings.xon = START_CHAR(tty);
	port_settings.xoff = STOP_CHAR(tty);
	dev_dbg(dev, "%s - XON = %2x, XOFF = %2x\n", __func__, port_settings.xon, port_settings.xoff);

	/* get the baud rate wanted */
	port_settings.baud = tty_get_baud_rate(tty);
	dev_dbg(dev, "%s - baud rate = %d\n", __func__, port_settings.baud);

	/* fixme: should set validated settings */
	tty_encode_baud_rate(tty, port_settings.baud, port_settings.baud);
	/* handle any settings that aren't specified in the tty structure */
	port_settings.lloop = 0;

	/* now send the message to the device */
	firm_send_command(port, WHITEHEAT_SETUP_PORT,
			(__u8 *)&port_settings, sizeof(port_settings));
}


static int firm_set_rts(struct usb_serial_port *port, __u8 onoff)
{
	struct whiteheat_set_rdb rts_command;

	rts_command.port = port->port_number + 1;
	rts_command.state = onoff;
	return firm_send_command(port, WHITEHEAT_SET_RTS,
			(__u8 *)&rts_command, sizeof(rts_command));
}


static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff)
{
	struct whiteheat_set_rdb dtr_command;

	dtr_command.port = port->port_number + 1;
	dtr_command.state = onoff;
	return firm_send_command(port, WHITEHEAT_SET_DTR,
			(__u8 *)&dtr_command, sizeof(dtr_command));
}


static int firm_set_break(struct usb_serial_port *port, __u8 onoff)
{
	struct whiteheat_set_rdb break_command;

	break_command.port = port->port_number + 1;
	break_command.state = onoff;
	return firm_send_command(port, WHITEHEAT_SET_BREAK,
			(__u8 *)&break_command, sizeof(break_command));
}


static int firm_purge(struct usb_serial_port *port, __u8 rxtx)
{
	struct whiteheat_purge purge_command;

	purge_command.port = port->port_number + 1;
	purge_command.what = rxtx;
	return firm_send_command(port, WHITEHEAT_PURGE,
			(__u8 *)&purge_command, sizeof(purge_command));
}


static int firm_get_dtr_rts(struct usb_serial_port *port)
{
	struct whiteheat_simple get_dr_command;

	get_dr_command.port = port->port_number + 1;
	return firm_send_command(port, WHITEHEAT_GET_DTR_RTS,
			(__u8 *)&get_dr_command, sizeof(get_dr_command));
}


static int firm_report_tx_done(struct usb_serial_port *port)
{
	struct whiteheat_simple close_command;

	close_command.port = port->port_number + 1;
	return firm_send_command(port, WHITEHEAT_REPORT_TX_DONE,
			(__u8 *)&close_command, sizeof(close_command));
}


/*****************************************************************************
 * Connect Tech's White Heat utility functions
 *****************************************************************************/
static int start_command_port(struct usb_serial *serial)
{
	struct usb_serial_port *command_port;
	struct whiteheat_command_private *command_info;
	int retval = 0;

	command_port = serial->port[COMMAND_PORT];
	command_info = usb_get_serial_port_data(command_port);
	mutex_lock(&command_info->mutex);
	if (!command_info->port_running) {
		/* Work around HCD bugs */
		usb_clear_halt(serial->dev, command_port->read_urb->pipe);

		retval = usb_submit_urb(command_port->read_urb, GFP_KERNEL);
		if (retval) {
			dev_err(&serial->dev->dev,
				"%s - failed submitting read urb, error %d\n",
				__func__, retval);
			goto exit;
		}
	}
	command_info->port_running++;

exit:
	mutex_unlock(&command_info->mutex);
	return retval;
}


static void stop_command_port(struct usb_serial *serial)
{
	struct usb_serial_port *command_port;
	struct whiteheat_command_private *command_info;

	command_port = serial->port[COMMAND_PORT];
	command_info = usb_get_serial_port_data(command_port);
	mutex_lock(&command_info->mutex);
	command_info->port_running--;
	if (!command_info->port_running)
		usb_kill_urb(command_port->read_urb);
	mutex_unlock(&command_info->mutex);
}

module_usb_serial_driver(serial_drivers, id_table_combined);

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

MODULE_FIRMWARE("whiteheat.fw");
MODULE_FIRMWARE("whiteheat_loader.fw");