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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/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
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
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)
71{
72 struct input_dev *dev = elo->dev;
73
74 elo->data[elo->idx] = data;
75
76 switch (elo->idx++) {
77 case 0:
78 elo->csum = 0xaa;
79 if (data != ELO10_LEAD_BYTE) {
80 dev_dbg(&elo->serio->dev,
81 "unsynchronized data: 0x%02x\n", data);
82 elo->idx = 0;
83 }
84 break;
85
86 case 9:
87 elo->idx = 0;
88 if (data != elo->csum) {
89 dev_dbg(&elo->serio->dev,
90 "bad checksum: 0x%02x, expected 0x%02x\n",
91 data, elo->csum);
92 break;
93 }
94 if (elo->data[1] != elo->expected_packet) {
95 if (elo->data[1] != ELO10_TOUCH_PACKET)
96 dev_dbg(&elo->serio->dev,
97 "unexpected packet: 0x%02x\n",
98 elo->data[1]);
99 break;
100 }
101 if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
102 input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
103 input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
104 if (elo->data[2] & ELO10_PRESSURE)
105 input_report_abs(dev, ABS_PRESSURE,
106 (elo->data[8] << 8) | elo->data[7]);
107 input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
108 input_sync(dev);
109 } else if (elo->data[1] == ELO10_ACK_PACKET) {
110 if (elo->data[2] == '0')
111 elo->expected_packet = ELO10_TOUCH_PACKET;
112 complete(&elo->cmd_done);
113 } else {
114 memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
115 elo->expected_packet = ELO10_ACK_PACKET;
116 }
117 break;
118 }
119 elo->csum += data;
120}
121
122static void elo_process_data_6(struct elo *elo, unsigned char data)
123{
124 struct input_dev *dev = elo->dev;
125
126 elo->data[elo->idx] = data;
127
128 switch (elo->idx++) {
129
130 case 0:
131 if ((data & 0xc0) != 0xc0)
132 elo->idx = 0;
133 break;
134
135 case 1:
136 if ((data & 0xc0) != 0x80)
137 elo->idx = 0;
138 break;
139
140 case 2:
141 if ((data & 0xc0) != 0x40)
142 elo->idx = 0;
143 break;
144
145 case 3:
146 if (data & 0xc0) {
147 elo->idx = 0;
148 break;
149 }
150
151 input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
152 input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
153
154 if (elo->id == 2) {
155 input_report_key(dev, BTN_TOUCH, 1);
156 input_sync(dev);
157 elo->idx = 0;
158 }
159
160 break;
161
162 case 4:
163 if (data) {
164 input_sync(dev);
165 elo->idx = 0;
166 }
167 break;
168
169 case 5:
170 if ((data & 0xf0) == 0) {
171 input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
172 input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
173 }
174 input_sync(dev);
175 elo->idx = 0;
176 break;
177 }
178}
179
180static void elo_process_data_3(struct elo *elo, unsigned char data)
181{
182 struct input_dev *dev = elo->dev;
183
184 elo->data[elo->idx] = data;
185
186 switch (elo->idx++) {
187
188 case 0:
189 if ((data & 0x7f) != 0x01)
190 elo->idx = 0;
191 break;
192 case 2:
193 input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
194 input_report_abs(dev, ABS_X, elo->data[1]);
195 input_report_abs(dev, ABS_Y, elo->data[2]);
196 input_sync(dev);
197 elo->idx = 0;
198 break;
199 }
200}
201
202static irqreturn_t elo_interrupt(struct serio *serio,
203 unsigned char data, unsigned int flags)
204{
205 struct elo *elo = serio_get_drvdata(serio);
206
207 switch (elo->id) {
208 case 0:
209 elo_process_data_10(elo, data);
210 break;
211
212 case 1:
213 case 2:
214 elo_process_data_6(elo, data);
215 break;
216
217 case 3:
218 elo_process_data_3(elo, data);
219 break;
220 }
221
222 return IRQ_HANDLED;
223}
224
225static int elo_command_10(struct elo *elo, unsigned char *packet)
226{
227 int rc = -1;
228 int i;
229 unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
230
231 mutex_lock(&elo->cmd_mutex);
232
233 serio_pause_rx(elo->serio);
234 elo->expected_packet = toupper(packet[0]);
235 init_completion(&elo->cmd_done);
236 serio_continue_rx(elo->serio);
237
238 if (serio_write(elo->serio, ELO10_LEAD_BYTE))
239 goto out;
240
241 for (i = 0; i < ELO10_PACKET_LEN; i++) {
242 csum += packet[i];
243 if (serio_write(elo->serio, packet[i]))
244 goto out;
245 }
246
247 if (serio_write(elo->serio, csum))
248 goto out;
249
250 wait_for_completion_timeout(&elo->cmd_done, HZ);
251
252 if (elo->expected_packet == ELO10_TOUCH_PACKET) {
253
254 memcpy(packet, elo->response, ELO10_PACKET_LEN);
255 rc = 0;
256 }
257
258 out:
259 mutex_unlock(&elo->cmd_mutex);
260 return rc;
261}
262
263static int elo_setup_10(struct elo *elo)
264{
265 static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
266 struct input_dev *dev = elo->dev;
267 unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
268
269 if (elo_command_10(elo, packet))
270 return -1;
271
272 dev->id.version = (packet[5] << 8) | packet[4];
273
274 input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
275 input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
276 if (packet[3] & ELO10_PRESSURE)
277 input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
278
279 dev_info(&elo->serio->dev,
280 "%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n",
281 elo_types[(packet[1] -'0') & 0x03],
282 packet[5], packet[4], packet[3], packet[7]);
283
284 return 0;
285}
286
287
288
289
290
291static void elo_disconnect(struct serio *serio)
292{
293 struct elo *elo = serio_get_drvdata(serio);
294
295 input_get_device(elo->dev);
296 input_unregister_device(elo->dev);
297 serio_close(serio);
298 serio_set_drvdata(serio, NULL);
299 input_put_device(elo->dev);
300 kfree(elo);
301}
302
303
304
305
306
307
308
309static int elo_connect(struct serio *serio, struct serio_driver *drv)
310{
311 struct elo *elo;
312 struct input_dev *input_dev;
313 int err;
314
315 elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
316 input_dev = input_allocate_device();
317 if (!elo || !input_dev) {
318 err = -ENOMEM;
319 goto fail1;
320 }
321
322 elo->serio = serio;
323 elo->id = serio->id.id;
324 elo->dev = input_dev;
325 elo->expected_packet = ELO10_TOUCH_PACKET;
326 mutex_init(&elo->cmd_mutex);
327 init_completion(&elo->cmd_done);
328 snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
329
330 input_dev->name = "Elo Serial TouchScreen";
331 input_dev->phys = elo->phys;
332 input_dev->id.bustype = BUS_RS232;
333 input_dev->id.vendor = SERIO_ELO;
334 input_dev->id.product = elo->id;
335 input_dev->id.version = 0x0100;
336 input_dev->dev.parent = &serio->dev;
337
338 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
339 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
340
341 serio_set_drvdata(serio, elo);
342 err = serio_open(serio, drv);
343 if (err)
344 goto fail2;
345
346 switch (elo->id) {
347
348 case 0:
349 if (elo_setup_10(elo))
350 goto fail3;
351
352 break;
353
354 case 1:
355 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
356
357 case 2:
358 input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
359 input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
360 break;
361
362 case 3:
363 input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
364 input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
365 break;
366 }
367
368 err = input_register_device(elo->dev);
369 if (err)
370 goto fail3;
371
372 return 0;
373
374 fail3: serio_close(serio);
375 fail2: serio_set_drvdata(serio, NULL);
376 fail1: input_free_device(input_dev);
377 kfree(elo);
378 return err;
379}
380
381
382
383
384
385static struct serio_device_id elo_serio_ids[] = {
386 {
387 .type = SERIO_RS232,
388 .proto = SERIO_ELO,
389 .id = SERIO_ANY,
390 .extra = SERIO_ANY,
391 },
392 { 0 }
393};
394
395MODULE_DEVICE_TABLE(serio, elo_serio_ids);
396
397static struct serio_driver elo_drv = {
398 .driver = {
399 .name = "elo",
400 },
401 .description = DRIVER_DESC,
402 .id_table = elo_serio_ids,
403 .interrupt = elo_interrupt,
404 .connect = elo_connect,
405 .disconnect = elo_disconnect,
406};
407
408module_serio_driver(elo_drv);
409
