summaryrefslogtreecommitdiffstats
path: root/drivers/input/mouse/hil_ptr.c
blob: c2bf2ed07dc6937aa8cbb98171d6b9021e4a577a (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
/*
 * Generic linux-input device driver for axis-bearing devices
 *
 * Copyright (c) 2001 Brian S. Julin
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *
 * References:
 * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
 *
 */

#include <linux/hil.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>

#define PREFIX "HIL PTR: "
#define HIL_GENERIC_NAME "HIL pointer device"

MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
MODULE_DESCRIPTION(HIL_GENERIC_NAME " driver");
MODULE_LICENSE("Dual BSD/GPL");


#define TABLET_SIMULATES_MOUSE	/* allow tablet to be used as mouse */
#undef  TABLET_AUTOADJUST	/* auto-adjust valid tablet ranges */


#define HIL_PTR_MAX_LENGTH 16

struct hil_ptr {
	struct input_dev dev;
	struct serio *serio;

	/* Input buffer and index for packets from HIL bus. */
	hil_packet data[HIL_PTR_MAX_LENGTH];
	int idx4; /* four counts per packet */

	/* Raw device info records from HIL bus, see hil.h for fields. */
	char	idd[HIL_PTR_MAX_LENGTH];	/* DID byte and IDD record */
	char	rsc[HIL_PTR_MAX_LENGTH];	/* RSC record */
	char	exd[HIL_PTR_MAX_LENGTH];	/* EXD record */
	char	rnm[HIL_PTR_MAX_LENGTH + 1];	/* RNM record + NULL term. */

	/* Extra device details not contained in struct input_dev. */
	unsigned int nbtn, naxes;
	unsigned int btnmap[7];

	/* Something to sleep around with. */
	struct semaphore sem;
};

/* Process a complete packet after transfer from the HIL */
static void hil_ptr_process_record(struct hil_ptr *ptr)
{
	struct input_dev *dev = &ptr->dev;
	hil_packet *data = ptr->data;
	hil_packet p;
	int idx, i, cnt, laxis;
	int ax16, absdev;

	idx = ptr->idx4/4;
	p = data[idx - 1];

	if ((p & ~HIL_CMDCT_POL) == 
	    (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL)) goto report;
	if ((p & ~HIL_CMDCT_RPL) == 
	    (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_RPL)) goto report;

	/* Not a poll response.  See if we are loading config records. */
	switch (p & HIL_PKT_DATA_MASK) {
	case HIL_CMD_IDD:
		for (i = 0; i < idx; i++)
			ptr->idd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
		for (; i < HIL_PTR_MAX_LENGTH; i++)
			ptr->idd[i] = 0;
		break;
	case HIL_CMD_RSC:
		for (i = 0; i < idx; i++)
			ptr->rsc[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
		for (; i < HIL_PTR_MAX_LENGTH; i++)
			ptr->rsc[i] = 0;
		break;
	case HIL_CMD_EXD:
		for (i = 0; i < idx; i++)
			ptr->exd[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
		for (; i < HIL_PTR_MAX_LENGTH; i++)
			ptr->exd[i] = 0;
		break;
	case HIL_CMD_RNM:
		for (i = 0; i < idx; i++)
			ptr->rnm[i] = ptr->data[i] & HIL_PKT_DATA_MASK;
		for (; i < HIL_PTR_MAX_LENGTH + 1; i++)
			ptr->rnm[i] = '\0';
		break;
	default:
		/* These occur when device isn't present */
		if (p == (HIL_ERR_INT | HIL_PKT_CMD)) break; 
		/* Anything else we'd like to know about. */
		printk(KERN_WARNING PREFIX "Device sent unknown record %x\n", p);
		break;
	}
	goto out;

 report:
	if ((p & HIL_CMDCT_POL) != idx - 1) {
		printk(KERN_WARNING PREFIX "Malformed poll packet %x (idx = %i)\n", p, idx);
		goto out;
	}

	i = (ptr->data[0] & HIL_POL_AXIS_ALT) ? 3 : 0;
	laxis = ptr->data[0] & HIL_POL_NUM_AXES_MASK;
	laxis += i;

	ax16 = ptr->idd[1] & HIL_IDD_HEADER_16BIT; /* 8 or 16bit resolution */
	absdev = ptr->idd[1] & HIL_IDD_HEADER_ABS; 

	for (cnt = 1; i < laxis; i++) {
		unsigned int lo,hi,val;
		lo = ptr->data[cnt++] & HIL_PKT_DATA_MASK;
		hi = ax16 ? (ptr->data[cnt++] & HIL_PKT_DATA_MASK) : 0;
		if (absdev) {
			val = lo + (hi<<8);
#ifdef TABLET_AUTOADJUST
			if (val < ptr->dev.absmin[ABS_X + i])
				ptr->dev.absmin[ABS_X + i] = val;
			if (val > ptr->dev.absmax[ABS_X + i])
				ptr->dev.absmax[ABS_X + i] = val;
#endif
			if (i%3) val = ptr->dev.absmax[ABS_X + i] - val;
			input_report_abs(dev, ABS_X + i, val);
		} else {
			val = (int) (((int8_t)lo) | ((int8_t)hi<<8));
			if (i%3) val *= -1;
			input_report_rel(dev, REL_X + i, val);
		}
	}

	while (cnt < idx - 1) {
		unsigned int btn;
		int up;
		btn = ptr->data[cnt++];
		up = btn & 1;
		btn &= 0xfe;
		if (btn == 0x8e) {
			continue; /* TODO: proximity == touch? */
		}
		else if ((btn > 0x8c) || (btn < 0x80)) continue;
		btn = (btn - 0x80) >> 1;
		btn = ptr->btnmap[btn];
		input_report_key(dev, btn, !up);
	}
	input_sync(dev);
 out:
	ptr->idx4 = 0;
	up(&ptr->sem);
}

static void hil_ptr_process_err(struct hil_ptr *ptr) {
	printk(KERN_WARNING PREFIX "errored HIL packet\n");
	ptr->idx4 = 0;
	up(&ptr->sem);
	return;
}

static irqreturn_t hil_ptr_interrupt(struct serio *serio, 
        unsigned char data, unsigned int flags, struct pt_regs *regs)
{
	struct hil_ptr *ptr;
	hil_packet packet;
	int idx;

	ptr = serio_get_drvdata(serio);
	if (ptr == NULL) {
		BUG();
		return IRQ_HANDLED;
	}

	if (ptr->idx4 >= (HIL_PTR_MAX_LENGTH * sizeof(hil_packet))) {
		hil_ptr_process_err(ptr);
		return IRQ_HANDLED;
	}
	idx = ptr->idx4/4;
	if (!(ptr->idx4 % 4)) ptr->data[idx] = 0;
	packet = ptr->data[idx];
	packet |= ((hil_packet)data) << ((3 - (ptr->idx4 % 4)) * 8);
	ptr->data[idx] = packet;

	/* Records of N 4-byte hil_packets must terminate with a command. */
	if ((++(ptr->idx4)) % 4) return IRQ_HANDLED;
	if ((packet & 0xffff0000) != HIL_ERR_INT) {
		hil_ptr_process_err(ptr);
		return IRQ_HANDLED;
	}
	if (packet & HIL_PKT_CMD) 
		hil_ptr_process_record(ptr);
	return IRQ_HANDLED;
}

static void hil_ptr_disconnect(struct serio *serio)
{
	struct hil_ptr *ptr;

	ptr = serio_get_drvdata(serio);
	if (ptr == NULL) {
		BUG();
		return;
	}

	input_unregister_device(&ptr->dev);
	serio_close(serio);
	kfree(ptr);
}

static int hil_ptr_connect(struct serio *serio, struct serio_driver *driver)
{
	struct hil_ptr	*ptr;
	char		*txt;
	unsigned int	i, naxsets, btntype;
	uint8_t		did, *idd;

	if (!(ptr = kmalloc(sizeof(struct hil_ptr), GFP_KERNEL))) return -ENOMEM;
	memset(ptr, 0, sizeof(struct hil_ptr));

	if (serio_open(serio, driver)) goto bail0;

	serio_set_drvdata(serio, ptr);
	ptr->serio = serio;
	ptr->dev.private = ptr;

	init_MUTEX_LOCKED(&(ptr->sem));

	/* Get device info.  MLC driver supplies devid/status/etc. */
	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_IDD);
	down(&(ptr->sem));

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_RSC);
	down(&(ptr->sem));

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_RNM);
	down(&(ptr->sem));

	serio->write(serio, 0);
	serio->write(serio, 0);
	serio->write(serio, HIL_PKT_CMD >> 8);
	serio->write(serio, HIL_CMD_EXD);
	down(&(ptr->sem));

	up(&(ptr->sem));

	init_input_dev(&ptr->dev);
	did = ptr->idd[0];
	idd = ptr->idd + 1;
	txt = "unknown";
	if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
		ptr->dev.evbit[0] = BIT(EV_REL);
		txt = "relative";
	}

	if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_ABS) {
		ptr->dev.evbit[0] = BIT(EV_ABS);
		txt = "absolute";
	}
	if (!ptr->dev.evbit[0]) {
		goto bail1;
	}

	ptr->nbtn = HIL_IDD_NUM_BUTTONS(idd);
	if (ptr->nbtn) ptr->dev.evbit[0] |= BIT(EV_KEY);

	naxsets = HIL_IDD_NUM_AXSETS(*idd);
	ptr->naxes = HIL_IDD_NUM_AXES_PER_SET(*idd);

	printk(KERN_INFO PREFIX "HIL pointer device found (did: 0x%02x, axis: %s)\n",
			did, txt);
	printk(KERN_INFO PREFIX "HIL pointer has %i buttons and %i sets of %i axes\n",
			ptr->nbtn, naxsets, ptr->naxes);
	
	btntype = BTN_MISC;
	if ((did & HIL_IDD_DID_ABS_TABLET_MASK) == HIL_IDD_DID_ABS_TABLET)
#ifdef TABLET_SIMULATES_MOUSE
		btntype = BTN_TOUCH;
#else
		btntype = BTN_DIGI;
#endif
	if ((did & HIL_IDD_DID_ABS_TSCREEN_MASK) == HIL_IDD_DID_ABS_TSCREEN)
		btntype = BTN_TOUCH;
		
	if ((did & HIL_IDD_DID_REL_MOUSE_MASK) == HIL_IDD_DID_REL_MOUSE)
		btntype = BTN_MOUSE;

	for (i = 0; i < ptr->nbtn; i++) {
		set_bit(btntype | i, ptr->dev.keybit);
		ptr->btnmap[i] = btntype | i;
	}

	if (btntype == BTN_MOUSE) {
		/* Swap buttons 2 and 3 */
		ptr->btnmap[1] = BTN_MIDDLE;
		ptr->btnmap[2] = BTN_RIGHT;
	}

	if ((did & HIL_IDD_DID_TYPE_MASK) == HIL_IDD_DID_TYPE_REL) {
		for (i = 0; i < ptr->naxes; i++) {
			set_bit(REL_X + i, ptr->dev.relbit);
		}
		for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
			set_bit(REL_X + i, ptr->dev.relbit);
		}
	} else {
		for (i = 0; i < ptr->naxes; i++) {
	  		set_bit(ABS_X + i, ptr->dev.absbit);
			ptr->dev.absmin[ABS_X + i] = 0;
			ptr->dev.absmax[ABS_X + i] = 
				HIL_IDD_AXIS_MAX((ptr->idd + 1), i);
		}
		for (i = 3; (i < ptr->naxes + 3) && (naxsets > 1); i++) {
			set_bit(ABS_X + i, ptr->dev.absbit);
			ptr->dev.absmin[ABS_X + i] = 0;
			ptr->dev.absmax[ABS_X + i] = 
				HIL_IDD_AXIS_MAX((ptr->idd + 1), (i - 3));
		}
#ifdef TABLET_AUTOADJUST
		for (i = 0; i < ABS_MAX; i++) {
			int diff = ptr->dev.absmax[ABS_X + i] / 10;
			ptr->dev.absmin[ABS_X + i] += diff;
			ptr->dev.absmax[ABS_X + i] -= diff;
		}
#endif
	}

	ptr->dev.name = strlen(ptr->rnm) ? ptr->rnm : HIL_GENERIC_NAME;

	ptr->dev.id.bustype	= BUS_HIL;
	ptr->dev.id.vendor	= PCI_VENDOR_ID_HP;
	ptr->dev.id.product	= 0x0001; /* TODO: get from ptr->rsc */
	ptr->dev.id.version	= 0x0100; /* TODO: get from ptr->rsc */
	ptr->dev.dev		= &serio->dev;

	input_register_device(&ptr->dev);
	printk(KERN_INFO "input: %s (%s), ID: %d\n",
                ptr->dev.name, 
		(btntype == BTN_MOUSE) ? "HIL mouse":"HIL tablet or touchpad",
		did);

	return 0;
 bail1:
	serio_close(serio);
 bail0:
	kfree(ptr);
	serio_set_drvdata(serio, NULL);
	return -ENODEV;
}

static struct serio_device_id hil_ptr_ids[] = {
	{
		.type = SERIO_HIL_MLC,
		.proto = SERIO_HIL,
		.id = SERIO_ANY,
		.extra = SERIO_ANY,
	},
	{ 0 }
};

static struct serio_driver hil_ptr_serio_driver = {
	.driver		= {
		.name	= "hil_ptr",
	},
	.description	= "HP HIL mouse/tablet driver",
	.id_table	= hil_ptr_ids,
	.connect	= hil_ptr_connect,
	.disconnect	= hil_ptr_disconnect,
	.interrupt	= hil_ptr_interrupt
};

static int __init hil_ptr_init(void)
{
	serio_register_driver(&hil_ptr_serio_driver);
        return 0;
}
                
static void __exit hil_ptr_exit(void)
{
	serio_unregister_driver(&hil_ptr_serio_driver);
}
                        
module_init(hil_ptr_init);
module_exit(hil_ptr_exit);
OpenPOWER on IntegriCloud