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Rick Kochee479992006-08-05 00:32:18 -04001/*
2 * Penmount serial touchscreen driver
3 *
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
John Sung21ae5082011-09-09 13:33:12 -07005 * Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
Rick Kochee479992006-08-05 00:32:18 -04006 *
7 * Based on ELO driver (drivers/input/touchscreen/elo.c)
8 * Copyright (c) 2004 Vojtech Pavlik
9 */
10
11/*
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published
14 * by the Free Software Foundation.
15 */
16
17#include <linux/errno.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21#include <linux/input.h>
John Sung90aba7d2011-09-09 13:33:12 -070022#include <linux/input/mt.h>
Rick Kochee479992006-08-05 00:32:18 -040023#include <linux/serio.h>
24#include <linux/init.h>
25
John Sung21ae5082011-09-09 13:33:12 -070026#define DRIVER_DESC "PenMount serial touchscreen driver"
Rick Kochee479992006-08-05 00:32:18 -040027
28MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
John Sung21ae5082011-09-09 13:33:12 -070029MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
Rick Kochee479992006-08-05 00:32:18 -040030MODULE_DESCRIPTION(DRIVER_DESC);
31MODULE_LICENSE("GPL");
32
33/*
34 * Definitions & global arrays.
35 */
36
John Sungc42e2e42011-09-09 13:33:12 -070037#define PM_MAX_LENGTH 6
John Sung90aba7d2011-09-09 13:33:12 -070038#define PM_MAX_MTSLOT 16
39#define PM_3000_MTSLOT 2
John Sungbd8f6d22011-09-09 13:33:12 -070040#define PM_6250_MTSLOT 12
John Sung90aba7d2011-09-09 13:33:12 -070041
42/*
43 * Multi-touch slot
44 */
45
46struct mt_slot {
47 unsigned short x, y;
48 bool active; /* is the touch valid? */
49};
Rick Kochee479992006-08-05 00:32:18 -040050
51/*
52 * Per-touchscreen data.
53 */
54
55struct pm {
56 struct input_dev *dev;
57 struct serio *serio;
58 int idx;
59 unsigned char data[PM_MAX_LENGTH];
60 char phys[32];
John Sungc42e2e42011-09-09 13:33:12 -070061 unsigned char packetsize;
John Sung90aba7d2011-09-09 13:33:12 -070062 unsigned char maxcontacts;
63 struct mt_slot slots[PM_MAX_MTSLOT];
Dmitry Torokhov98b013e2011-09-12 22:12:58 -070064 void (*parse_packet)(struct pm *);
Rick Kochee479992006-08-05 00:32:18 -040065};
66
John Sungc42e2e42011-09-09 13:33:12 -070067/*
John Sung90aba7d2011-09-09 13:33:12 -070068 * pm_mtevent() sends mt events and also emulates pointer movement
69 */
70
71static void pm_mtevent(struct pm *pm, struct input_dev *input)
72{
73 int i;
74
75 for (i = 0; i < pm->maxcontacts; ++i) {
76 input_mt_slot(input, i);
77 input_mt_report_slot_state(input, MT_TOOL_FINGER,
78 pm->slots[i].active);
79 if (pm->slots[i].active) {
80 input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x);
81 input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y);
82 }
83 }
84
85 input_mt_report_pointer_emulation(input, true);
86 input_sync(input);
87}
88
89/*
John Sungc42e2e42011-09-09 13:33:12 -070090 * pm_checkpacket() checks if data packet is valid
91 */
92
93static bool pm_checkpacket(unsigned char *packet)
94{
95 int total = 0;
96 int i;
97
98 for (i = 0; i < 5; i++)
99 total += packet[i];
100
101 return packet[5] == (unsigned char)~(total & 0xff);
102}
103
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700104static void pm_parse_9000(struct pm *pm)
105{
106 struct input_dev *dev = pm->dev;
107
108 if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) {
109 input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
110 input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
111 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
112 input_sync(dev);
113 pm->idx = 0;
114 }
115}
116
117static void pm_parse_6000(struct pm *pm)
118{
119 struct input_dev *dev = pm->dev;
120
121 if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) {
122 if (pm_checkpacket(pm->data)) {
123 input_report_abs(dev, ABS_X,
124 pm->data[2] * 256 + pm->data[1]);
125 input_report_abs(dev, ABS_Y,
126 pm->data[4] * 256 + pm->data[3]);
127 input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40);
128 input_sync(dev);
129 }
130 pm->idx = 0;
131 }
132}
133
134static void pm_parse_3000(struct pm *pm)
135{
136 struct input_dev *dev = pm->dev;
137
138 if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) {
139 if (pm_checkpacket(pm->data)) {
140 int slotnum = pm->data[0] & 0x0f;
141 pm->slots[slotnum].active = pm->data[0] & 0x30;
142 pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
143 pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
144 pm_mtevent(pm, dev);
145 }
146 pm->idx = 0;
147 }
148}
149
150static void pm_parse_6250(struct pm *pm)
151{
152 struct input_dev *dev = pm->dev;
153
154 if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) {
155 if (pm_checkpacket(pm->data)) {
156 int slotnum = pm->data[0] & 0x0f;
157 pm->slots[slotnum].active = pm->data[0] & 0x40;
158 pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
159 pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
160 pm_mtevent(pm, dev);
161 }
162 pm->idx = 0;
163 }
164}
165
Rick Kochee479992006-08-05 00:32:18 -0400166static irqreturn_t pm_interrupt(struct serio *serio,
David Howells7d12e782006-10-05 14:55:46 +0100167 unsigned char data, unsigned int flags)
Rick Kochee479992006-08-05 00:32:18 -0400168{
169 struct pm *pm = serio_get_drvdata(serio);
Rick Kochee479992006-08-05 00:32:18 -0400170
171 pm->data[pm->idx] = data;
172
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700173 pm->parse_packet(pm);
Rick Kochee479992006-08-05 00:32:18 -0400174
175 return IRQ_HANDLED;
176}
177
178/*
179 * pm_disconnect() is the opposite of pm_connect()
180 */
181
182static void pm_disconnect(struct serio *serio)
183{
184 struct pm *pm = serio_get_drvdata(serio);
185
Rick Kochee479992006-08-05 00:32:18 -0400186 serio_close(serio);
Dmitry Torokhovc3a01ba2011-09-12 22:13:00 -0700187
188 input_unregister_device(pm->dev);
Rick Kochee479992006-08-05 00:32:18 -0400189 kfree(pm);
Dmitry Torokhovc3a01ba2011-09-12 22:13:00 -0700190
191 serio_set_drvdata(serio, NULL);
Rick Kochee479992006-08-05 00:32:18 -0400192}
193
194/*
195 * pm_connect() is the routine that is called when someone adds a
John Sung21ae5082011-09-09 13:33:12 -0700196 * new serio device that supports PenMount protocol and registers it as
Rick Kochee479992006-08-05 00:32:18 -0400197 * an input device.
198 */
199
200static int pm_connect(struct serio *serio, struct serio_driver *drv)
201{
202 struct pm *pm;
203 struct input_dev *input_dev;
John Sung90aba7d2011-09-09 13:33:12 -0700204 int max_x, max_y;
Rick Kochee479992006-08-05 00:32:18 -0400205 int err;
206
207 pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
208 input_dev = input_allocate_device();
209 if (!pm || !input_dev) {
210 err = -ENOMEM;
211 goto fail1;
212 }
213
214 pm->serio = serio;
215 pm->dev = input_dev;
216 snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
John Sung90aba7d2011-09-09 13:33:12 -0700217 pm->maxcontacts = 1;
Rick Kochee479992006-08-05 00:32:18 -0400218
John Sung21ae5082011-09-09 13:33:12 -0700219 input_dev->name = "PenMount Serial TouchScreen";
Rick Kochee479992006-08-05 00:32:18 -0400220 input_dev->phys = pm->phys;
221 input_dev->id.bustype = BUS_RS232;
222 input_dev->id.vendor = SERIO_PENMOUNT;
223 input_dev->id.product = 0;
224 input_dev->id.version = 0x0100;
Dmitry Torokhova5394fb02007-04-12 01:35:14 -0400225 input_dev->dev.parent = &serio->dev;
Rick Kochee479992006-08-05 00:32:18 -0400226
John Sung90aba7d2011-09-09 13:33:12 -0700227 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
228 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
Rick Kochee479992006-08-05 00:32:18 -0400229
John Sungc42e2e42011-09-09 13:33:12 -0700230 switch (serio->id.id) {
231 default:
232 case 0:
233 pm->packetsize = 5;
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700234 pm->parse_packet = pm_parse_9000;
John Sungc42e2e42011-09-09 13:33:12 -0700235 input_dev->id.product = 0x9000;
John Sung90aba7d2011-09-09 13:33:12 -0700236 max_x = max_y = 0x3ff;
John Sungc42e2e42011-09-09 13:33:12 -0700237 break;
238
239 case 1:
240 pm->packetsize = 6;
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700241 pm->parse_packet = pm_parse_6000;
John Sungc42e2e42011-09-09 13:33:12 -0700242 input_dev->id.product = 0x6000;
John Sung90aba7d2011-09-09 13:33:12 -0700243 max_x = max_y = 0x3ff;
John Sungc42e2e42011-09-09 13:33:12 -0700244 break;
John Sung90aba7d2011-09-09 13:33:12 -0700245
246 case 2:
247 pm->packetsize = 6;
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700248 pm->parse_packet = pm_parse_3000;
John Sung90aba7d2011-09-09 13:33:12 -0700249 input_dev->id.product = 0x3000;
250 max_x = max_y = 0x7ff;
251 pm->maxcontacts = PM_3000_MTSLOT;
252 break;
John Sungbd8f6d22011-09-09 13:33:12 -0700253
254 case 3:
255 pm->packetsize = 6;
Dmitry Torokhov98b013e2011-09-12 22:12:58 -0700256 pm->parse_packet = pm_parse_6250;
John Sungbd8f6d22011-09-09 13:33:12 -0700257 input_dev->id.product = 0x6250;
258 max_x = max_y = 0x3ff;
259 pm->maxcontacts = PM_6250_MTSLOT;
260 break;
John Sung90aba7d2011-09-09 13:33:12 -0700261 }
262
263 input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0);
264 input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0);
265
266 if (pm->maxcontacts > 1) {
267 input_mt_init_slots(pm->dev, pm->maxcontacts);
268 input_set_abs_params(pm->dev,
269 ABS_MT_POSITION_X, 0, max_x, 0, 0);
270 input_set_abs_params(pm->dev,
271 ABS_MT_POSITION_Y, 0, max_y, 0, 0);
John Sungc42e2e42011-09-09 13:33:12 -0700272 }
273
Rick Kochee479992006-08-05 00:32:18 -0400274 serio_set_drvdata(serio, pm);
275
276 err = serio_open(serio, drv);
277 if (err)
278 goto fail2;
279
280 err = input_register_device(pm->dev);
281 if (err)
282 goto fail3;
283
284 return 0;
285
286 fail3: serio_close(serio);
287 fail2: serio_set_drvdata(serio, NULL);
288 fail1: input_free_device(input_dev);
289 kfree(pm);
290 return err;
291}
292
293/*
294 * The serio driver structure.
295 */
296
297static struct serio_device_id pm_serio_ids[] = {
298 {
299 .type = SERIO_RS232,
300 .proto = SERIO_PENMOUNT,
301 .id = SERIO_ANY,
302 .extra = SERIO_ANY,
303 },
304 { 0 }
305};
306
307MODULE_DEVICE_TABLE(serio, pm_serio_ids);
308
309static struct serio_driver pm_drv = {
310 .driver = {
John Sung21ae5082011-09-09 13:33:12 -0700311 .name = "serio-penmount",
Rick Kochee479992006-08-05 00:32:18 -0400312 },
313 .description = DRIVER_DESC,
314 .id_table = pm_serio_ids,
315 .interrupt = pm_interrupt,
316 .connect = pm_connect,
317 .disconnect = pm_disconnect,
318};
319
Axel Lin65ac9f72012-04-03 23:50:17 -0700320module_serio_driver(pm_drv);