tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Elo serial touchscreen driver
3 *
4 * Copyright (c) 2004 Vojtech Pavlik
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13/*
14 * This driver can handle serial Elo touchscreens using either the Elo standard
15 * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
16 * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
17 */
18
19#include <linux/errno.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/input.h>
24#include <linux/serio.h>
25#include <linux/init.h>
26#include <linux/ctype.h>
27
28#define DRIVER_DESC "Elo serial touchscreen driver"
29
30MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
31MODULE_DESCRIPTION(DRIVER_DESC);
32MODULE_LICENSE("GPL");
33
34/*
35 * Definitions & global arrays.
36 */
37
38#define ELO_MAX_LENGTH 10
39
40#define ELO10_PACKET_LEN 8
41#define ELO10_TOUCH 0x03
42#define ELO10_PRESSURE 0x80
43
44#define ELO10_LEAD_BYTE 'U'
45
46#define ELO10_ID_CMD 'i'
47
48#define ELO10_TOUCH_PACKET 'T'
49#define ELO10_ACK_PACKET 'A'
50#define ELI10_ID_PACKET 'I'
51
52/*
53 * Per-touchscreen data.
54 */
55
56struct elo {
57 struct input_dev *dev;
58 struct serio *serio;
59 struct mutex cmd_mutex;
60 struct completion cmd_done;
61 int id;
62 int idx;
63 unsigned char expected_packet;
64 unsigned char csum;
65 unsigned char data[ELO_MAX_LENGTH];
66 unsigned char response[ELO10_PACKET_LEN];
67 char phys[32];
68};
69
70static void elo_process_data_10(struct elo *elo, unsigned char data, struct pt_regs *regs)
71{
72 struct input_dev *dev = elo->dev;
73
74 elo->data[elo->idx] = data;
75 switch (elo->idx++) {
76 case 0:
77 elo->csum = 0xaa;
78 if (data != ELO10_LEAD_BYTE) {
79 pr_debug("elo: unsynchronized data: 0x%02x\n", data);
80 elo->idx = 0;
81 }
82 break;
83
84 case 9:
85 elo->idx = 0;
86 if (data != elo->csum) {
87 pr_debug("elo: bad checksum: 0x%02x, expected 0x%02x\n",
88 data, elo->csum);
89 break;
90 }
91 if (elo->data[1] != elo->expected_packet) {
92 if (elo->data[1] != ELO10_TOUCH_PACKET)
93 pr_debug("elo: unexpected packet: 0x%02x\n",
94 elo->data[1]);
95 break;
96 }
97 if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
98 input_regs(dev, regs);
99 input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
100 input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
101 if (elo->data[2] & ELO10_PRESSURE)
102 input_report_abs(dev, ABS_PRESSURE,
103 (elo->data[8] << 8) | elo->data[7]);
104 input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
105 input_sync(dev);
106 } else if (elo->data[1] == ELO10_ACK_PACKET) {
107 if (elo->data[2] == '0')
108 elo->expected_packet = ELO10_TOUCH_PACKET;
109 complete(&elo->cmd_done);
110 } else {
111 memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
112 elo->expected_packet = ELO10_ACK_PACKET;
113 }
114 break;
115 }
116 elo->csum += data;
117}
118
119static void elo_process_data_6(struct elo *elo, unsigned char data, struct pt_regs *regs)
120{
121 struct input_dev *dev = elo->dev;
122
123 elo->data[elo->idx] = data;
124
125 switch (elo->idx++) {
126
127 case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
128 case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
129 case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
130
131 case 3:
132 if (data & 0xc0) {
133 elo->idx = 0;
134 break;
135 }
136
137 input_regs(dev, regs);
138 input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
139 input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
140
141 if (elo->id == 2) {
142 input_report_key(dev, BTN_TOUCH, 1);
143 input_sync(dev);
144 elo->idx = 0;
145 }
146
147 break;
148
149 case 4:
150 if (data) {
151 input_sync(dev);
152 elo->idx = 0;
153 }
154 break;
155
156 case 5:
157 if ((data & 0xf0) == 0) {
158 input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
159 input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
160 }
161 input_sync(dev);
162 elo->idx = 0;
163 break;
164 }
165}
166
167static void elo_process_data_3(struct elo *elo, unsigned char data, struct pt_regs *regs)
168{
169 struct input_dev *dev = elo->dev;
170
171 elo->data[elo->idx] = data;
172
173 switch (elo->idx++) {
174
175 case 0:
176 if ((data & 0x7f) != 0x01)
177 elo->idx = 0;
178 break;
179 case 2:
180 input_regs(dev, regs);
181 input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
182 input_report_abs(dev, ABS_X, elo->data[1]);
183 input_report_abs(dev, ABS_Y, elo->data[2]);
184 input_sync(dev);
185 elo->idx = 0;
186 break;
187 }
188}
189
190static irqreturn_t elo_interrupt(struct serio *serio,
191 unsigned char data, unsigned int flags, struct pt_regs *regs)
192{
193 struct elo *elo = serio_get_drvdata(serio);
194
195 switch(elo->id) {
196 case 0:
197 elo_process_data_10(elo, data, regs);
198 break;
199
200 case 1:
201 case 2:
202 elo_process_data_6(elo, data, regs);
203 break;
204
205 case 3:
206 elo_process_data_3(elo, data, regs);
207 break;
208 }
209
210 return IRQ_HANDLED;
211}
212
213static int elo_command_10(struct elo *elo, unsigned char *packet)
214{
215 int rc = -1;
216 int i;
217 unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
218
219 mutex_lock(&elo->cmd_mutex);
220
221 serio_pause_rx(elo->serio);
222 elo->expected_packet = toupper(packet[0]);
223 init_completion(&elo->cmd_done);
224 serio_continue_rx(elo->serio);
225
226 if (serio_write(elo->serio, ELO10_LEAD_BYTE))
227 goto out;
228
229 for (i = 0; i < ELO10_PACKET_LEN; i++) {
230 csum += packet[i];
231 if (serio_write(elo->serio, packet[i]))
232 goto out;
233 }
234
235 if (serio_write(elo->serio, csum))
236 goto out;
237
238 wait_for_completion_timeout(&elo->cmd_done, HZ);
239
240 if (elo->expected_packet == ELO10_TOUCH_PACKET) {
241 /* We are back in reporting mode, the command was ACKed */
242 memcpy(packet, elo->response, ELO10_PACKET_LEN);
243 rc = 0;
244 }
245
246 out:
247 mutex_unlock(&elo->cmd_mutex);
248 return rc;
249}
250
251static int elo_setup_10(struct elo *elo)
252{
253 static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
254 struct input_dev *dev = elo->dev;
255 unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
256
257 if (elo_command_10(elo, packet))
258 return -1;
259
260 dev->id.version = (packet[5] << 8) | packet[4];
261
262 input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
263 input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
264 if (packet[3] & ELO10_PRESSURE)
265 input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
266
267 printk(KERN_INFO "elo: %sTouch touchscreen, fw: %02x.%02x, "
268 "features: %x02x, controller: 0x%02x\n",
269 elo_types[(packet[1] -'0') & 0x03],
270 packet[5], packet[4], packet[3], packet[7]);
271
272 return 0;
273}
274
275/*
276 * elo_disconnect() is the opposite of elo_connect()
277 */
278
279static void elo_disconnect(struct serio *serio)
280{
281 struct elo *elo = serio_get_drvdata(serio);
282
283 input_get_device(elo->dev);
284 input_unregister_device(elo->dev);
285 serio_close(serio);
286 serio_set_drvdata(serio, NULL);
287 input_put_device(elo->dev);
288 kfree(elo);
289}
290
291/*
292 * elo_connect() is the routine that is called when someone adds a
293 * new serio device that supports Gunze protocol and registers it as
294 * an input device.
295 */
296
297static int elo_connect(struct serio *serio, struct serio_driver *drv)
298{
299 struct elo *elo;
300 struct input_dev *input_dev;
301 int err;
302
303 elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
304 input_dev = input_allocate_device();
305 if (!elo || !input_dev) {
306 err = -ENOMEM;
307 goto fail1;
308 }
309
310 elo->serio = serio;
311 elo->id = serio->id.id;
312 elo->dev = input_dev;
313 elo->expected_packet = ELO10_TOUCH_PACKET;
314 mutex_init(&elo->cmd_mutex);
315 init_completion(&elo->cmd_done);
316 snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
317
318 input_dev->private = elo;
319 input_dev->name = "Elo Serial TouchScreen";
320 input_dev->phys = elo->phys;
321 input_dev->id.bustype = BUS_RS232;
322 input_dev->id.vendor = SERIO_ELO;
323 input_dev->id.product = elo->id;
324 input_dev->id.version = 0x0100;
325 input_dev->cdev.dev = &serio->dev;
326
327 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
328 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
329
330 serio_set_drvdata(serio, elo);
331 err = serio_open(serio, drv);
332 if (err)
333 goto fail2;
334
335 switch (elo->id) {
336
337 case 0: /* 10-byte protocol */
338 if (elo_setup_10(elo))
339 goto fail3;
340
341 break;
342
343 case 1: /* 6-byte protocol */
344 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
345
346 case 2: /* 4-byte protocol */
347 input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
348 input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
349 break;
350
351 case 3: /* 3-byte protocol */
352 input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
353 input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
354 break;
355 }
356
357 err = input_register_device(elo->dev);
358 if (err)
359 goto fail3;
360
361 return 0;
362
363 fail3: serio_close(serio);
364 fail2: serio_set_drvdata(serio, NULL);
365 fail1: input_free_device(input_dev);
366 kfree(elo);
367 return err;
368}
369
370/*
371 * The serio driver structure.
372 */
373
374static struct serio_device_id elo_serio_ids[] = {
375 {
376 .type = SERIO_RS232,
377 .proto = SERIO_ELO,
378 .id = SERIO_ANY,
379 .extra = SERIO_ANY,
380 },
381 { 0 }
382};
383
384MODULE_DEVICE_TABLE(serio, elo_serio_ids);
385
386static struct serio_driver elo_drv = {
387 .driver = {
388 .name = "elo",
389 },
390 .description = DRIVER_DESC,
391 .id_table = elo_serio_ids,
392 .interrupt = elo_interrupt,
393 .connect = elo_connect,
394 .disconnect = elo_disconnect,
395};
396
397/*
398 * The functions for inserting/removing us as a module.
399 */
400
401static int __init elo_init(void)
402{
403 serio_register_driver(&elo_drv);
404 return 0;
405}
406
407static void __exit elo_exit(void)
408{
409 serio_unregister_driver(&elo_drv);
410}
411
412module_init(elo_init);
413module_exit(elo_exit);