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