summaryrefslogtreecommitdiff
path: root/drivers/input/tablet/wacom_serial4.c
blob: 1d46b763aae695813821d24570f4e0e3fa8f7907 (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
/*
 * Wacom protocol 4 serial tablet driver
 *
 * Copyright 2014      Hans de Goede <hdegoede@redhat.com>
 * Copyright 2011-2012 Julian Squires <julian@cipht.net>
 *
 * 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 of 2 of the License, or (at your
 * option) any later version. See the file COPYING in the main directory of
 * this archive for more details.
 *
 * Many thanks to Bill Seremetis, without whom PenPartner support
 * would not have been possible. Thanks to Patrick Mahoney.
 *
 * This driver was developed with reference to much code written by others,
 * particularly:
 *  - elo, gunze drivers by Vojtech Pavlik <vojtech@ucw.cz>;
 *  - wacom_w8001 driver by Jaya Kumar <jayakumar.lkml@gmail.com>;
 *  - the USB wacom input driver, credited to many people
 *    (see drivers/input/tablet/wacom.h);
 *  - new and old versions of linuxwacom / xf86-input-wacom credited to
 *    Frederic Lepied, France. <Lepied@XFree86.org> and
 *    Ping Cheng, Wacom. <pingc@wacom.com>;
 *  - and xf86wacom.c (a presumably ancient version of the linuxwacom code),
 *    by Frederic Lepied and Raph Levien <raph@gtk.org>.
 *
 * To do:
 *  - support pad buttons; (requires access to a model with pad buttons)
 *  - support (protocol 4-style) tilt (requires access to a > 1.4 rom model)
 */

/*
 * Wacom serial protocol 4 documentation taken from linuxwacom-0.9.9 code,
 * protocol 4 uses 7 or 9 byte of data in the following format:
 *
 *	Byte 1
 *	bit 7  Sync bit always 1
 *	bit 6  Pointing device detected
 *	bit 5  Cursor = 0 / Stylus = 1
 *	bit 4  Reserved
 *	bit 3  1 if a button on the pointing device has been pressed
 *	bit 2  P0 (optional)
 *	bit 1  X15
 *	bit 0  X14
 *
 *	Byte 2
 *	bit 7  Always 0
 *	bits 6-0 = X13 - X7
 *
 *	Byte 3
 *	bit 7  Always 0
 *	bits 6-0 = X6 - X0
 *
 *	Byte 4
 *	bit 7  Always 0
 *	bit 6  B3
 *	bit 5  B2
 *	bit 4  B1
 *	bit 3  B0
 *	bit 2  P1 (optional)
 *	bit 1  Y15
 *	bit 0  Y14
 *
 *	Byte 5
 *	bit 7  Always 0
 *	bits 6-0 = Y13 - Y7
 *
 *	Byte 6
 *	bit 7  Always 0
 *	bits 6-0 = Y6 - Y0
 *
 *	Byte 7
 *	bit 7 Always 0
 *	bit 6  Sign of pressure data; or wheel-rel for cursor tool
 *	bit 5  P7; or REL1 for cursor tool
 *	bit 4  P6; or REL0 for cursor tool
 *	bit 3  P5
 *	bit 2  P4
 *	bit 1  P3
 *	bit 0  P2
 *
 *	byte 8 and 9 are optional and present only
 *	in tilt mode.
 *
 *	Byte 8
 *	bit 7 Always 0
 *	bit 6 Sign of tilt X
 *	bit 5  Xt6
 *	bit 4  Xt5
 *	bit 3  Xt4
 *	bit 2  Xt3
 *	bit 1  Xt2
 *	bit 0  Xt1
 *
 *	Byte 9
 *	bit 7 Always 0
 *	bit 6 Sign of tilt Y
 *	bit 5  Yt6
 *	bit 4  Yt5
 *	bit 3  Yt4
 *	bit 2  Yt3
 *	bit 1  Yt2
 *	bit 0  Yt1
 */

#include <linux/completion.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/slab.h>
#include <linux/string.h>

MODULE_AUTHOR("Julian Squires <julian@cipht.net>, Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Wacom protocol 4 serial tablet driver");
MODULE_LICENSE("GPL");

#define REQUEST_MODEL_AND_ROM_VERSION	"~#"
#define REQUEST_MAX_COORDINATES		"~C\r"
#define REQUEST_CONFIGURATION_STRING	"~R\r"
#define REQUEST_RESET_TO_PROTOCOL_IV	"\r#"
/*
 * Note: sending "\r$\r" causes at least the Digitizer II to send
 * packets in ASCII instead of binary.  "\r#" seems to undo that.
 */

#define COMMAND_START_SENDING_PACKETS		"ST\r"
#define COMMAND_STOP_SENDING_PACKETS		"SP\r"
#define COMMAND_MULTI_MODE_INPUT		"MU1\r"
#define COMMAND_ORIGIN_IN_UPPER_LEFT		"OC1\r"
#define COMMAND_ENABLE_ALL_MACRO_BUTTONS	"~M0\r"
#define COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS	"~M1\r"
#define COMMAND_TRANSMIT_AT_MAX_RATE		"IT0\r"
#define COMMAND_DISABLE_INCREMENTAL_MODE	"IN0\r"
#define COMMAND_ENABLE_CONTINUOUS_MODE		"SR\r"
#define COMMAND_ENABLE_PRESSURE_MODE		"PH1\r"
#define COMMAND_Z_FILTER			"ZF1\r"

/* Note that this is a protocol 4 packet without tilt information. */
#define PACKET_LENGTH		7
#define DATA_SIZE		32

/* flags */
#define F_COVERS_SCREEN		0x01
#define F_HAS_STYLUS2		0x02
#define F_HAS_SCROLLWHEEL	0x04

/* device IDs */
#define STYLUS_DEVICE_ID	0x02
#define CURSOR_DEVICE_ID	0x06
#define ERASER_DEVICE_ID	0x0A

enum { STYLUS = 1, ERASER, CURSOR };

static const struct {
	int device_id;
	int input_id;
} tools[] = {
	{ 0, 0 },
	{ STYLUS_DEVICE_ID, BTN_TOOL_PEN },
	{ ERASER_DEVICE_ID, BTN_TOOL_RUBBER },
	{ CURSOR_DEVICE_ID, BTN_TOOL_MOUSE },
};

struct wacom {
	struct input_dev *dev;
	struct completion cmd_done;
	int result;
	u8 expect;
	u8 eraser_mask;
	unsigned int extra_z_bits;
	unsigned int flags;
	unsigned int res_x, res_y;
	unsigned int max_x, max_y;
	unsigned int tool;
	unsigned int idx;
	u8 data[DATA_SIZE];
	char phys[32];
};

enum {
	MODEL_CINTIQ		= 0x504C, /* PL */
	MODEL_CINTIQ2		= 0x4454, /* DT */
	MODEL_DIGITIZER_II	= 0x5544, /* UD */
	MODEL_GRAPHIRE		= 0x4554, /* ET */
	MODEL_PENPARTNER	= 0x4354, /* CT */
	MODEL_ARTPAD_II		= 0x4B54, /* KT */
};

static void wacom_handle_model_response(struct wacom *wacom)
{
	int major_v, minor_v, r = 0;
	char *p;

	p = strrchr(wacom->data, 'V');
	if (p)
		r = sscanf(p + 1, "%u.%u", &major_v, &minor_v);
	if (r != 2)
		major_v = minor_v = 0;

	switch (wacom->data[2] << 8 | wacom->data[3]) {
	case MODEL_CINTIQ:	/* UNTESTED */
	case MODEL_CINTIQ2:
		if ((wacom->data[2] << 8 | wacom->data[3]) == MODEL_CINTIQ) {
			wacom->dev->name = "Wacom Cintiq";
			wacom->dev->id.version = MODEL_CINTIQ;
		} else {
			wacom->dev->name = "Wacom Cintiq II";
			wacom->dev->id.version = MODEL_CINTIQ2;
		}
		wacom->res_x = 508;
		wacom->res_y = 508;

		switch (wacom->data[5] << 8 | wacom->data[6]) {
		case 0x3731: /* PL-710 */
			wacom->res_x = 2540;
			wacom->res_y = 2540;
			/* fall through */
		case 0x3535: /* PL-550 */
		case 0x3830: /* PL-800 */
			wacom->extra_z_bits = 2;
		}

		wacom->flags = F_COVERS_SCREEN;
		break;

	case MODEL_PENPARTNER:
		wacom->dev->name = "Wacom Penpartner";
		wacom->dev->id.version = MODEL_PENPARTNER;
		wacom->res_x = 1000;
		wacom->res_y = 1000;
		break;

	case MODEL_GRAPHIRE:
		wacom->dev->name = "Wacom Graphire";
		wacom->dev->id.version = MODEL_GRAPHIRE;
		wacom->res_x = 1016;
		wacom->res_y = 1016;
		wacom->max_x = 5103;
		wacom->max_y = 3711;
		wacom->extra_z_bits = 2;
		wacom->eraser_mask = 0x08;
		wacom->flags = F_HAS_STYLUS2 | F_HAS_SCROLLWHEEL;
		break;

	case MODEL_ARTPAD_II:
	case MODEL_DIGITIZER_II:
		wacom->dev->name = "Wacom Digitizer II";
		wacom->dev->id.version = MODEL_DIGITIZER_II;
		if (major_v == 1 && minor_v <= 2)
			wacom->extra_z_bits = 0; /* UNTESTED */
		break;

	default:
		dev_err(&wacom->dev->dev, "Unsupported Wacom model %s\n",
			wacom->data);
		wacom->result = -ENODEV;
		return;
	}

	dev_info(&wacom->dev->dev, "%s tablet, version %u.%u\n",
		 wacom->dev->name, major_v, minor_v);
}

static void wacom_handle_configuration_response(struct wacom *wacom)
{
	int r, skip;

	dev_dbg(&wacom->dev->dev, "Configuration string: %s\n", wacom->data);
	r = sscanf(wacom->data, "~R%x,%u,%u,%u,%u", &skip, &skip, &skip,
		   &wacom->res_x, &wacom->res_y);
	if (r != 5)
		dev_warn(&wacom->dev->dev, "could not get resolution\n");
}

static void wacom_handle_coordinates_response(struct wacom *wacom)
{
	int r;

	dev_dbg(&wacom->dev->dev, "Coordinates string: %s\n", wacom->data);
	r = sscanf(wacom->data, "~C%u,%u", &wacom->max_x, &wacom->max_y);
	if (r != 2)
		dev_warn(&wacom->dev->dev, "could not get max coordinates\n");
}

static void wacom_handle_response(struct wacom *wacom)
{
	if (wacom->data[0] != '~' || wacom->data[1] != wacom->expect) {
		dev_err(&wacom->dev->dev,
			"Wacom got an unexpected response: %s\n", wacom->data);
		wacom->result = -EIO;
	} else {
		wacom->result = 0;

		switch (wacom->data[1]) {
		case '#':
			wacom_handle_model_response(wacom);
			break;
		case 'R':
			wacom_handle_configuration_response(wacom);
			break;
		case 'C':
			wacom_handle_coordinates_response(wacom);
			break;
		}
	}

	complete(&wacom->cmd_done);
}

static void wacom_handle_packet(struct wacom *wacom)
{
	u8 in_proximity_p, stylus_p, button;
	unsigned int tool;
	int x, y, z;

	in_proximity_p = wacom->data[0] & 0x40;
	stylus_p = wacom->data[0] & 0x20;
	button = (wacom->data[3] & 0x78) >> 3;
	x = (wacom->data[0] & 3) << 14 | wacom->data[1]<<7 | wacom->data[2];
	y = (wacom->data[3] & 3) << 14 | wacom->data[4]<<7 | wacom->data[5];

	if (in_proximity_p && stylus_p) {
		z = wacom->data[6] & 0x7f;
		if (wacom->extra_z_bits >= 1)
			z = z << 1 | (wacom->data[3] & 0x4) >> 2;
		if (wacom->extra_z_bits > 1)
			z = z << 1 | (wacom->data[0] & 0x4) >> 2;
		z = z ^ (0x40 << wacom->extra_z_bits);
	} else {
		z = -1;
	}

	if (stylus_p)
		tool = (button & wacom->eraser_mask) ? ERASER : STYLUS;
	else
		tool = CURSOR;

	if (tool != wacom->tool && wacom->tool != 0) {
		input_report_key(wacom->dev, tools[wacom->tool].input_id, 0);
		input_sync(wacom->dev);
	}
	wacom->tool = tool;

	input_report_key(wacom->dev, tools[tool].input_id, in_proximity_p);
	input_report_abs(wacom->dev, ABS_MISC,
			 in_proximity_p ? tools[tool].device_id : 0);
	input_report_abs(wacom->dev, ABS_X, x);
	input_report_abs(wacom->dev, ABS_Y, y);
	input_report_abs(wacom->dev, ABS_PRESSURE, z);
	if (stylus_p) {
		input_report_key(wacom->dev, BTN_TOUCH, button & 1);
		input_report_key(wacom->dev, BTN_STYLUS, button & 2);
		input_report_key(wacom->dev, BTN_STYLUS2, button & 4);
	} else {
		input_report_key(wacom->dev, BTN_LEFT, button & 1);
		input_report_key(wacom->dev, BTN_RIGHT, button & 2);
		input_report_key(wacom->dev, BTN_MIDDLE, button & 4);
		/* handle relative wheel for non-stylus device */
		z = (wacom->data[6] & 0x30) >> 4;
		if (wacom->data[6] & 0x40)
			z = -z;
		input_report_rel(wacom->dev, REL_WHEEL, z);
	}
	input_sync(wacom->dev);
}

static void wacom_clear_data_buf(struct wacom *wacom)
{
	memset(wacom->data, 0, DATA_SIZE);
	wacom->idx = 0;
}

static irqreturn_t wacom_interrupt(struct serio *serio, unsigned char data,
				   unsigned int flags)
{
	struct wacom *wacom = serio_get_drvdata(serio);

	if (data & 0x80)
		wacom->idx = 0;

	/*
	 * We're either expecting a carriage return-terminated ASCII
	 * response string, or a seven-byte packet with the MSB set on
	 * the first byte.
	 *
	 * Note however that some tablets (the PenPartner, for
	 * example) don't send a carriage return at the end of a
	 * command.  We handle these by waiting for timeout.
	 */
	if (data == '\r' && !(wacom->data[0] & 0x80)) {
		wacom_handle_response(wacom);
		wacom_clear_data_buf(wacom);
		return IRQ_HANDLED;
	}

	/* Leave place for 0 termination */
	if (wacom->idx > (DATA_SIZE - 2)) {
		dev_dbg(&wacom->dev->dev,
			"throwing away %d bytes of garbage\n", wacom->idx);
		wacom_clear_data_buf(wacom);
	}
	wacom->data[wacom->idx++] = data;

	if (wacom->idx == PACKET_LENGTH && (wacom->data[0] & 0x80)) {
		wacom_handle_packet(wacom);
		wacom_clear_data_buf(wacom);
	}

	return IRQ_HANDLED;
}

static void wacom_disconnect(struct serio *serio)
{
	struct wacom *wacom = serio_get_drvdata(serio);

	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_unregister_device(wacom->dev);
	kfree(wacom);
}

static int wacom_send(struct serio *serio, const u8 *command)
{
	int err = 0;

	for (; !err && *command; command++)
		err = serio_write(serio, *command);

	return err;
}

static int wacom_send_setup_string(struct wacom *wacom, struct serio *serio)
{
	const u8 *cmd;

	switch (wacom->dev->id.version) {
	case MODEL_CINTIQ:	/* UNTESTED */
		cmd = COMMAND_ORIGIN_IN_UPPER_LEFT
			COMMAND_TRANSMIT_AT_MAX_RATE
			COMMAND_ENABLE_CONTINUOUS_MODE
			COMMAND_START_SENDING_PACKETS;
		break;

	case MODEL_PENPARTNER:
		cmd = COMMAND_ENABLE_PRESSURE_MODE
			COMMAND_START_SENDING_PACKETS;
		break;

	default:
		cmd = COMMAND_MULTI_MODE_INPUT
			COMMAND_ORIGIN_IN_UPPER_LEFT
			COMMAND_ENABLE_ALL_MACRO_BUTTONS
			COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS
			COMMAND_TRANSMIT_AT_MAX_RATE
			COMMAND_DISABLE_INCREMENTAL_MODE
			COMMAND_ENABLE_CONTINUOUS_MODE
			COMMAND_Z_FILTER
			COMMAND_START_SENDING_PACKETS;
		break;
	}

	return wacom_send(serio, cmd);
}

static int wacom_send_and_wait(struct wacom *wacom, struct serio *serio,
			       const u8 *cmd, const char *desc)
{
	int err;
	unsigned long u;

	wacom->expect = cmd[1];
	init_completion(&wacom->cmd_done);

	err = wacom_send(serio, cmd);
	if (err)
		return err;

	u = wait_for_completion_timeout(&wacom->cmd_done, HZ);
	if (u == 0) {
		/* Timeout, process what we've received. */
		wacom_handle_response(wacom);
	}

	wacom->expect = 0;
	return wacom->result;
}

static int wacom_setup(struct wacom *wacom, struct serio *serio)
{
	int err;

	/* Note that setting the link speed is the job of inputattach.
	 * We assume that reset negotiation has already happened,
	 * here. */
	err = wacom_send_and_wait(wacom, serio, REQUEST_MODEL_AND_ROM_VERSION,
				  "model and version");
	if (err)
		return err;

	if (!(wacom->res_x && wacom->res_y)) {
		err = wacom_send_and_wait(wacom, serio,
					  REQUEST_CONFIGURATION_STRING,
					  "configuration string");
		if (err)
			return err;
	}

	if (!(wacom->max_x && wacom->max_y)) {
		err = wacom_send_and_wait(wacom, serio,
					  REQUEST_MAX_COORDINATES,
					  "coordinates string");
		if (err)
			return err;
	}

	return wacom_send_setup_string(wacom, serio);
}

static int wacom_connect(struct serio *serio, struct serio_driver *drv)
{
	struct wacom *wacom;
	struct input_dev *input_dev;
	int err = -ENOMEM;

	wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!wacom || !input_dev)
		goto free_device;

	wacom->dev = input_dev;
	wacom->extra_z_bits = 1;
	wacom->eraser_mask = 0x04;
	wacom->tool = wacom->idx = 0;
	snprintf(wacom->phys, sizeof(wacom->phys), "%s/input0", serio->phys);
	input_dev->phys = wacom->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor  = SERIO_WACOM_IV;
	input_dev->id.product = serio->id.extra;
	input_dev->dev.parent = &serio->dev;

	input_dev->evbit[0] =
		BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_REL);
	set_bit(ABS_MISC, input_dev->absbit);
	set_bit(BTN_TOOL_PEN, input_dev->keybit);
	set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
	set_bit(BTN_TOOL_MOUSE, input_dev->keybit);
	set_bit(BTN_TOUCH, input_dev->keybit);
	set_bit(BTN_STYLUS, input_dev->keybit);
	set_bit(BTN_LEFT, input_dev->keybit);
	set_bit(BTN_RIGHT, input_dev->keybit);
	set_bit(BTN_MIDDLE, input_dev->keybit);

	serio_set_drvdata(serio, wacom);

	err = serio_open(serio, drv);
	if (err)
		goto free_device;

	err = wacom_setup(wacom, serio);
	if (err)
		goto close_serio;

	set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
	if (!(wacom->flags & F_COVERS_SCREEN))
		__set_bit(INPUT_PROP_POINTER, input_dev->propbit);

	if (wacom->flags & F_HAS_STYLUS2)
		__set_bit(BTN_STYLUS2, input_dev->keybit);

	if (wacom->flags & F_HAS_SCROLLWHEEL)
		__set_bit(REL_WHEEL, input_dev->relbit);

	input_abs_set_res(wacom->dev, ABS_X, wacom->res_x);
	input_abs_set_res(wacom->dev, ABS_Y, wacom->res_y);
	input_set_abs_params(wacom->dev, ABS_X, 0, wacom->max_x, 0, 0);
	input_set_abs_params(wacom->dev, ABS_Y, 0, wacom->max_y, 0, 0);
	input_set_abs_params(wacom->dev, ABS_PRESSURE, -1,
			     (1 << (7 + wacom->extra_z_bits)) - 1, 0, 0);

	err = input_register_device(wacom->dev);
	if (err)
		goto close_serio;

	return 0;

close_serio:
	serio_close(serio);
free_device:
	serio_set_drvdata(serio, NULL);
	input_free_device(input_dev);
	kfree(wacom);
	return err;
}

static struct serio_device_id wacom_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_WACOM_IV,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, wacom_serio_ids);

static struct serio_driver wacom_drv = {
	.driver		= {
		.name	= "wacom_serial4",
	},
	.description	= "Wacom protocol 4 serial tablet driver",
	.id_table	= wacom_serio_ids,
	.interrupt	= wacom_interrupt,
	.connect	= wacom_connect,
	.disconnect	= wacom_disconnect,
};

module_serio_driver(wacom_drv);