summaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/penmount.c
blob: 4ccde45b9da2bfac620f81c62aa9c6b95d5f873c (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
/*
 * Penmount serial touchscreen driver
 *
 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
 * Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
 *
 * Based on ELO driver (drivers/input/touchscreen/elo.c)
 * Copyright (c) 2004 Vojtech Pavlik
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/serio.h>
#include <linux/init.h>

#define DRIVER_DESC	"PenMount serial touchscreen driver"

MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

#define	PM_MAX_LENGTH	6
#define	PM_MAX_MTSLOT	16
#define	PM_3000_MTSLOT	2
#define	PM_6250_MTSLOT	12

/*
 * Multi-touch slot
 */

struct mt_slot {
	unsigned short x, y;
	bool active; /* is the touch valid? */
};

/*
 * Per-touchscreen data.
 */

struct pm {
	struct input_dev *dev;
	struct serio *serio;
	int idx;
	unsigned char data[PM_MAX_LENGTH];
	char phys[32];
	unsigned char packetsize;
	unsigned char maxcontacts;
	struct mt_slot slots[PM_MAX_MTSLOT];
	void (*parse_packet)(struct pm *);
};

/*
 * pm_mtevent() sends mt events and also emulates pointer movement
 */

static void pm_mtevent(struct pm *pm, struct input_dev *input)
{
	int i;

	for (i = 0; i < pm->maxcontacts; ++i) {
		input_mt_slot(input, i);
		input_mt_report_slot_state(input, MT_TOOL_FINGER,
				pm->slots[i].active);
		if (pm->slots[i].active) {
			input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x);
			input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y);
		}
	}

	input_mt_report_pointer_emulation(input, true);
	input_sync(input);
}

/*
 * pm_checkpacket() checks if data packet is valid
 */

static bool pm_checkpacket(unsigned char *packet)
{
	int total = 0;
	int i;

	for (i = 0; i < 5; i++)
		total += packet[i];

	return packet[5] == (unsigned char)~(total & 0xff);
}

static void pm_parse_9000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) {
		input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
		input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
		input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
		input_sync(dev);
		pm->idx = 0;
	}
}

static void pm_parse_6000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			input_report_abs(dev, ABS_X,
					pm->data[2] * 256 + pm->data[1]);
			input_report_abs(dev, ABS_Y,
					pm->data[4] * 256 + pm->data[3]);
			input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40);
			input_sync(dev);
		}
		pm->idx = 0;
	}
}

static void pm_parse_3000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			int slotnum = pm->data[0] & 0x0f;
			pm->slots[slotnum].active = pm->data[0] & 0x30;
			pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
			pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
			pm_mtevent(pm, dev);
		}
		pm->idx = 0;
	}
}

static void pm_parse_6250(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			int slotnum = pm->data[0] & 0x0f;
			pm->slots[slotnum].active = pm->data[0] & 0x40;
			pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
			pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
			pm_mtevent(pm, dev);
		}
		pm->idx = 0;
	}
}

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

	pm->data[pm->idx] = data;

	pm->parse_packet(pm);

	return IRQ_HANDLED;
}

/*
 * pm_disconnect() is the opposite of pm_connect()
 */

static void pm_disconnect(struct serio *serio)
{
	struct pm *pm = serio_get_drvdata(serio);

	serio_close(serio);

	input_unregister_device(pm->dev);
	kfree(pm);

	serio_set_drvdata(serio, NULL);
}

/*
 * pm_connect() is the routine that is called when someone adds a
 * new serio device that supports PenMount protocol and registers it as
 * an input device.
 */

static int pm_connect(struct serio *serio, struct serio_driver *drv)
{
	struct pm *pm;
	struct input_dev *input_dev;
	int max_x, max_y;
	int err;

	pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!pm || !input_dev) {
		err = -ENOMEM;
		goto fail1;
	}

	pm->serio = serio;
	pm->dev = input_dev;
	snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
	pm->maxcontacts = 1;

	input_dev->name = "PenMount Serial TouchScreen";
	input_dev->phys = pm->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_PENMOUNT;
	input_dev->id.product = 0;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &serio->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	switch (serio->id.id) {
	default:
	case 0:
		pm->packetsize = 5;
		pm->parse_packet = pm_parse_9000;
		input_dev->id.product = 0x9000;
		max_x = max_y = 0x3ff;
		break;

	case 1:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_6000;
		input_dev->id.product = 0x6000;
		max_x = max_y = 0x3ff;
		break;

	case 2:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_3000;
		input_dev->id.product = 0x3000;
		max_x = max_y = 0x7ff;
		pm->maxcontacts = PM_3000_MTSLOT;
		break;

	case 3:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_6250;
		input_dev->id.product = 0x6250;
		max_x = max_y = 0x3ff;
		pm->maxcontacts = PM_6250_MTSLOT;
		break;
	}

	input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0);
	input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0);

	if (pm->maxcontacts > 1) {
		input_mt_init_slots(pm->dev, pm->maxcontacts);
		input_set_abs_params(pm->dev,
				     ABS_MT_POSITION_X, 0, max_x, 0, 0);
		input_set_abs_params(pm->dev,
				     ABS_MT_POSITION_Y, 0, max_y, 0, 0);
	}

	serio_set_drvdata(serio, pm);

	err = serio_open(serio, drv);
	if (err)
		goto fail2;

	err = input_register_device(pm->dev);
	if (err)
		goto fail3;

	return 0;

 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
	kfree(pm);
	return err;
}

/*
 * The serio driver structure.
 */

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

MODULE_DEVICE_TABLE(serio, pm_serio_ids);

static struct serio_driver pm_drv = {
	.driver		= {
		.name	= "serio-penmount",
	},
	.description	= DRIVER_DESC,
	.id_table	= pm_serio_ids,
	.interrupt	= pm_interrupt,
	.connect	= pm_connect,
	.disconnect	= pm_disconnect,
};

module_serio_driver(pm_drv);