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[deliverable/linux.git] / drivers / input / touchscreen / wacom_w8001.c
1 /*
2 * Wacom W8001 penabled serial touchscreen driver
3 *
4 * Copyright (c) 2008 Jaya Kumar
5 * Copyright (c) 2010 Red Hat, Inc.
6 * Copyright (c) 2010 - 2011 Ping Cheng, Wacom. <pingc@wacom.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 *
12 * Layout based on Elo serial touchscreen driver by Vojtech Pavlik
13 */
14
15 #include <linux/errno.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/input/mt.h>
20 #include <linux/serio.h>
21 #include <linux/ctype.h>
22 #include <linux/delay.h>
23
24 #define DRIVER_DESC "Wacom W8001 serial touchscreen driver"
25
26 MODULE_AUTHOR("Jaya Kumar <jayakumar.lkml@gmail.com>");
27 MODULE_DESCRIPTION(DRIVER_DESC);
28 MODULE_LICENSE("GPL");
29
30 #define W8001_MAX_LENGTH 11
31 #define W8001_LEAD_MASK 0x80
32 #define W8001_LEAD_BYTE 0x80
33 #define W8001_TAB_MASK 0x40
34 #define W8001_TAB_BYTE 0x40
35 /* set in first byte of touch data packets */
36 #define W8001_TOUCH_MASK (0x10 | W8001_LEAD_MASK)
37 #define W8001_TOUCH_BYTE (0x10 | W8001_LEAD_BYTE)
38
39 #define W8001_QUERY_PACKET 0x20
40
41 #define W8001_CMD_STOP '0'
42 #define W8001_CMD_START '1'
43 #define W8001_CMD_QUERY '*'
44 #define W8001_CMD_TOUCHQUERY '%'
45
46 /* length of data packets in bytes, depends on device. */
47 #define W8001_PKTLEN_TOUCH93 5
48 #define W8001_PKTLEN_TOUCH9A 7
49 #define W8001_PKTLEN_TPCPEN 9
50 #define W8001_PKTLEN_TPCCTL 11 /* control packet */
51 #define W8001_PKTLEN_TOUCH2FG 13
52
53 /* resolution in points/mm */
54 #define W8001_PEN_RESOLUTION 100
55 #define W8001_TOUCH_RESOLUTION 10
56
57 struct w8001_coord {
58 u8 rdy;
59 u8 tsw;
60 u8 f1;
61 u8 f2;
62 u16 x;
63 u16 y;
64 u16 pen_pressure;
65 u8 tilt_x;
66 u8 tilt_y;
67 };
68
69 /* touch query reply packet */
70 struct w8001_touch_query {
71 u16 x;
72 u16 y;
73 u8 panel_res;
74 u8 capacity_res;
75 u8 sensor_id;
76 };
77
78 /*
79 * Per-touchscreen data.
80 */
81
82 struct w8001 {
83 struct input_dev *dev;
84 struct serio *serio;
85 struct completion cmd_done;
86 int id;
87 int idx;
88 unsigned char response_type;
89 unsigned char response[W8001_MAX_LENGTH];
90 unsigned char data[W8001_MAX_LENGTH];
91 char phys[32];
92 int type;
93 unsigned int pktlen;
94 u16 max_touch_x;
95 u16 max_touch_y;
96 u16 max_pen_x;
97 u16 max_pen_y;
98 char name[64];
99 };
100
101 static void parse_pen_data(u8 *data, struct w8001_coord *coord)
102 {
103 memset(coord, 0, sizeof(*coord));
104
105 coord->rdy = data[0] & 0x20;
106 coord->tsw = data[0] & 0x01;
107 coord->f1 = data[0] & 0x02;
108 coord->f2 = data[0] & 0x04;
109
110 coord->x = (data[1] & 0x7F) << 9;
111 coord->x |= (data[2] & 0x7F) << 2;
112 coord->x |= (data[6] & 0x60) >> 5;
113
114 coord->y = (data[3] & 0x7F) << 9;
115 coord->y |= (data[4] & 0x7F) << 2;
116 coord->y |= (data[6] & 0x18) >> 3;
117
118 coord->pen_pressure = data[5] & 0x7F;
119 coord->pen_pressure |= (data[6] & 0x07) << 7 ;
120
121 coord->tilt_x = data[7] & 0x7F;
122 coord->tilt_y = data[8] & 0x7F;
123 }
124
125 static void parse_single_touch(u8 *data, struct w8001_coord *coord)
126 {
127 coord->x = (data[1] << 7) | data[2];
128 coord->y = (data[3] << 7) | data[4];
129 coord->tsw = data[0] & 0x01;
130 }
131
132 static void scale_touch_coordinates(struct w8001 *w8001,
133 unsigned int *x, unsigned int *y)
134 {
135 if (w8001->max_pen_x && w8001->max_touch_x)
136 *x = *x * w8001->max_pen_x / w8001->max_touch_x;
137
138 if (w8001->max_pen_y && w8001->max_touch_y)
139 *y = *y * w8001->max_pen_y / w8001->max_touch_y;
140 }
141
142 static void parse_multi_touch(struct w8001 *w8001)
143 {
144 struct input_dev *dev = w8001->dev;
145 unsigned char *data = w8001->data;
146 unsigned int x, y;
147 int i;
148 int count = 0;
149
150 for (i = 0; i < 2; i++) {
151 bool touch = data[0] & (1 << i);
152
153 input_mt_slot(dev, i);
154 input_mt_report_slot_state(dev, MT_TOOL_FINGER, touch);
155 if (touch) {
156 x = (data[6 * i + 1] << 7) | data[6 * i + 2];
157 y = (data[6 * i + 3] << 7) | data[6 * i + 4];
158 /* data[5,6] and [11,12] is finger capacity */
159
160 /* scale to pen maximum */
161 scale_touch_coordinates(w8001, &x, &y);
162
163 input_report_abs(dev, ABS_MT_POSITION_X, x);
164 input_report_abs(dev, ABS_MT_POSITION_Y, y);
165 count++;
166 }
167 }
168
169 /* emulate single touch events when stylus is out of proximity.
170 * This is to make single touch backward support consistent
171 * across all Wacom single touch devices.
172 */
173 if (w8001->type != BTN_TOOL_PEN &&
174 w8001->type != BTN_TOOL_RUBBER) {
175 w8001->type = count == 1 ? BTN_TOOL_FINGER : KEY_RESERVED;
176 input_mt_report_pointer_emulation(dev, true);
177 }
178
179 input_sync(dev);
180 }
181
182 static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
183 {
184 memset(query, 0, sizeof(*query));
185
186 query->panel_res = data[1];
187 query->sensor_id = data[2] & 0x7;
188 query->capacity_res = data[7];
189
190 query->x = data[3] << 9;
191 query->x |= data[4] << 2;
192 query->x |= (data[2] >> 5) & 0x3;
193
194 query->y = data[5] << 9;
195 query->y |= data[6] << 2;
196 query->y |= (data[2] >> 3) & 0x3;
197
198 /* Early days' single-finger touch models need the following defaults */
199 if (!query->x && !query->y) {
200 query->x = 1024;
201 query->y = 1024;
202 if (query->panel_res)
203 query->x = query->y = (1 << query->panel_res);
204 query->panel_res = W8001_TOUCH_RESOLUTION;
205 }
206 }
207
208 static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
209 {
210 struct input_dev *dev = w8001->dev;
211
212 /*
213 * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
214 * side2/eraser. If rdy && f2 are set, this can be either pen + side2,
215 * or eraser. Assume:
216 * - if dev is already in proximity and f2 is toggled → pen + side2
217 * - if dev comes into proximity with f2 set → eraser
218 * If f2 disappears after assuming eraser, fake proximity out for
219 * eraser and in for pen.
220 */
221
222 switch (w8001->type) {
223 case BTN_TOOL_RUBBER:
224 if (!coord->f2) {
225 input_report_abs(dev, ABS_PRESSURE, 0);
226 input_report_key(dev, BTN_TOUCH, 0);
227 input_report_key(dev, BTN_STYLUS, 0);
228 input_report_key(dev, BTN_STYLUS2, 0);
229 input_report_key(dev, BTN_TOOL_RUBBER, 0);
230 input_sync(dev);
231 w8001->type = BTN_TOOL_PEN;
232 }
233 break;
234
235 case BTN_TOOL_FINGER:
236 input_report_key(dev, BTN_TOUCH, 0);
237 input_report_key(dev, BTN_TOOL_FINGER, 0);
238 input_sync(dev);
239 /* fall through */
240
241 case KEY_RESERVED:
242 w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
243 break;
244
245 default:
246 input_report_key(dev, BTN_STYLUS2, coord->f2);
247 break;
248 }
249
250 input_report_abs(dev, ABS_X, coord->x);
251 input_report_abs(dev, ABS_Y, coord->y);
252 input_report_abs(dev, ABS_PRESSURE, coord->pen_pressure);
253 input_report_key(dev, BTN_TOUCH, coord->tsw);
254 input_report_key(dev, BTN_STYLUS, coord->f1);
255 input_report_key(dev, w8001->type, coord->rdy);
256 input_sync(dev);
257
258 if (!coord->rdy)
259 w8001->type = KEY_RESERVED;
260 }
261
262 static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
263 {
264 struct input_dev *dev = w8001->dev;
265 unsigned int x = coord->x;
266 unsigned int y = coord->y;
267
268 /* scale to pen maximum */
269 scale_touch_coordinates(w8001, &x, &y);
270
271 input_report_abs(dev, ABS_X, x);
272 input_report_abs(dev, ABS_Y, y);
273 input_report_key(dev, BTN_TOUCH, coord->tsw);
274 input_report_key(dev, BTN_TOOL_FINGER, coord->tsw);
275
276 input_sync(dev);
277
278 w8001->type = coord->tsw ? BTN_TOOL_FINGER : KEY_RESERVED;
279 }
280
281 static irqreturn_t w8001_interrupt(struct serio *serio,
282 unsigned char data, unsigned int flags)
283 {
284 struct w8001 *w8001 = serio_get_drvdata(serio);
285 struct w8001_coord coord;
286 unsigned char tmp;
287
288 w8001->data[w8001->idx] = data;
289 switch (w8001->idx++) {
290 case 0:
291 if ((data & W8001_LEAD_MASK) != W8001_LEAD_BYTE) {
292 pr_debug("w8001: unsynchronized data: 0x%02x\n", data);
293 w8001->idx = 0;
294 }
295 break;
296
297 case W8001_PKTLEN_TOUCH93 - 1:
298 case W8001_PKTLEN_TOUCH9A - 1:
299 tmp = w8001->data[0] & W8001_TOUCH_BYTE;
300 if (tmp != W8001_TOUCH_BYTE)
301 break;
302
303 if (w8001->pktlen == w8001->idx) {
304 w8001->idx = 0;
305 if (w8001->type != BTN_TOOL_PEN &&
306 w8001->type != BTN_TOOL_RUBBER) {
307 parse_single_touch(w8001->data, &coord);
308 report_single_touch(w8001, &coord);
309 }
310 }
311 break;
312
313 /* Pen coordinates packet */
314 case W8001_PKTLEN_TPCPEN - 1:
315 tmp = w8001->data[0] & W8001_TAB_MASK;
316 if (unlikely(tmp == W8001_TAB_BYTE))
317 break;
318
319 tmp = w8001->data[0] & W8001_TOUCH_BYTE;
320 if (tmp == W8001_TOUCH_BYTE)
321 break;
322
323 w8001->idx = 0;
324 parse_pen_data(w8001->data, &coord);
325 report_pen_events(w8001, &coord);
326 break;
327
328 /* control packet */
329 case W8001_PKTLEN_TPCCTL - 1:
330 tmp = w8001->data[0] & W8001_TOUCH_MASK;
331 if (tmp == W8001_TOUCH_BYTE)
332 break;
333
334 w8001->idx = 0;
335 memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
336 w8001->response_type = W8001_QUERY_PACKET;
337 complete(&w8001->cmd_done);
338 break;
339
340 /* 2 finger touch packet */
341 case W8001_PKTLEN_TOUCH2FG - 1:
342 w8001->idx = 0;
343 parse_multi_touch(w8001);
344 break;
345 }
346
347 return IRQ_HANDLED;
348 }
349
350 static int w8001_command(struct w8001 *w8001, unsigned char command,
351 bool wait_response)
352 {
353 int rc;
354
355 w8001->response_type = 0;
356 init_completion(&w8001->cmd_done);
357
358 rc = serio_write(w8001->serio, command);
359 if (rc == 0 && wait_response) {
360
361 wait_for_completion_timeout(&w8001->cmd_done, HZ);
362 if (w8001->response_type != W8001_QUERY_PACKET)
363 rc = -EIO;
364 }
365
366 return rc;
367 }
368
369 static int w8001_open(struct input_dev *dev)
370 {
371 struct w8001 *w8001 = input_get_drvdata(dev);
372
373 return w8001_command(w8001, W8001_CMD_START, false);
374 }
375
376 static void w8001_close(struct input_dev *dev)
377 {
378 struct w8001 *w8001 = input_get_drvdata(dev);
379
380 w8001_command(w8001, W8001_CMD_STOP, false);
381 }
382
383 static int w8001_setup(struct w8001 *w8001)
384 {
385 struct input_dev *dev = w8001->dev;
386 struct w8001_coord coord;
387 struct w8001_touch_query touch;
388 int error;
389
390 error = w8001_command(w8001, W8001_CMD_STOP, false);
391 if (error)
392 return error;
393
394 msleep(250); /* wait 250ms before querying the device */
395
396 dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
397 strlcat(w8001->name, "Wacom Serial", sizeof(w8001->name));
398
399 __set_bit(INPUT_PROP_DIRECT, dev->propbit);
400
401 /* penabled? */
402 error = w8001_command(w8001, W8001_CMD_QUERY, true);
403 if (!error) {
404 __set_bit(BTN_TOUCH, dev->keybit);
405 __set_bit(BTN_TOOL_PEN, dev->keybit);
406 __set_bit(BTN_TOOL_RUBBER, dev->keybit);
407 __set_bit(BTN_STYLUS, dev->keybit);
408 __set_bit(BTN_STYLUS2, dev->keybit);
409
410 parse_pen_data(w8001->response, &coord);
411 w8001->max_pen_x = coord.x;
412 w8001->max_pen_y = coord.y;
413
414 input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
415 input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
416 input_abs_set_res(dev, ABS_X, W8001_PEN_RESOLUTION);
417 input_abs_set_res(dev, ABS_Y, W8001_PEN_RESOLUTION);
418 input_set_abs_params(dev, ABS_PRESSURE, 0, coord.pen_pressure, 0, 0);
419 if (coord.tilt_x && coord.tilt_y) {
420 input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
421 input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
422 }
423 w8001->id = 0x90;
424 strlcat(w8001->name, " Penabled", sizeof(w8001->name));
425 }
426
427 /* Touch enabled? */
428 error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
429
430 /*
431 * Some non-touch devices may reply to the touch query. But their
432 * second byte is empty, which indicates touch is not supported.
433 */
434 if (!error && w8001->response[1]) {
435 __set_bit(BTN_TOUCH, dev->keybit);
436 __set_bit(BTN_TOOL_FINGER, dev->keybit);
437
438 parse_touchquery(w8001->response, &touch);
439 w8001->max_touch_x = touch.x;
440 w8001->max_touch_y = touch.y;
441
442 if (w8001->max_pen_x && w8001->max_pen_y) {
443 /* if pen is supported scale to pen maximum */
444 touch.x = w8001->max_pen_x;
445 touch.y = w8001->max_pen_y;
446 touch.panel_res = W8001_PEN_RESOLUTION;
447 }
448
449 input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
450 input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
451 input_abs_set_res(dev, ABS_X, touch.panel_res);
452 input_abs_set_res(dev, ABS_Y, touch.panel_res);
453
454 switch (touch.sensor_id) {
455 case 0:
456 case 2:
457 w8001->pktlen = W8001_PKTLEN_TOUCH93;
458 w8001->id = 0x93;
459 strlcat(w8001->name, " 1FG", sizeof(w8001->name));
460 break;
461
462 case 1:
463 case 3:
464 case 4:
465 w8001->pktlen = W8001_PKTLEN_TOUCH9A;
466 strlcat(w8001->name, " 1FG", sizeof(w8001->name));
467 w8001->id = 0x9a;
468 break;
469
470 case 5:
471 w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
472
473 input_mt_init_slots(dev, 2, 0);
474 input_set_abs_params(dev, ABS_MT_POSITION_X,
475 0, touch.x, 0, 0);
476 input_set_abs_params(dev, ABS_MT_POSITION_Y,
477 0, touch.y, 0, 0);
478 input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
479 0, MT_TOOL_MAX, 0, 0);
480
481 strlcat(w8001->name, " 2FG", sizeof(w8001->name));
482 if (w8001->max_pen_x && w8001->max_pen_y)
483 w8001->id = 0xE3;
484 else
485 w8001->id = 0xE2;
486 break;
487 }
488 }
489
490 strlcat(w8001->name, " Touchscreen", sizeof(w8001->name));
491
492 return 0;
493 }
494
495 /*
496 * w8001_disconnect() is the opposite of w8001_connect()
497 */
498
499 static void w8001_disconnect(struct serio *serio)
500 {
501 struct w8001 *w8001 = serio_get_drvdata(serio);
502
503 serio_close(serio);
504
505 input_unregister_device(w8001->dev);
506 kfree(w8001);
507
508 serio_set_drvdata(serio, NULL);
509 }
510
511 /*
512 * w8001_connect() is the routine that is called when someone adds a
513 * new serio device that supports the w8001 protocol and registers it as
514 * an input device.
515 */
516
517 static int w8001_connect(struct serio *serio, struct serio_driver *drv)
518 {
519 struct w8001 *w8001;
520 struct input_dev *input_dev;
521 int err;
522
523 w8001 = kzalloc(sizeof(struct w8001), GFP_KERNEL);
524 input_dev = input_allocate_device();
525 if (!w8001 || !input_dev) {
526 err = -ENOMEM;
527 goto fail1;
528 }
529
530 w8001->serio = serio;
531 w8001->dev = input_dev;
532 init_completion(&w8001->cmd_done);
533 snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
534
535 serio_set_drvdata(serio, w8001);
536 err = serio_open(serio, drv);
537 if (err)
538 goto fail2;
539
540 err = w8001_setup(w8001);
541 if (err)
542 goto fail3;
543
544 input_dev->name = w8001->name;
545 input_dev->phys = w8001->phys;
546 input_dev->id.product = w8001->id;
547 input_dev->id.bustype = BUS_RS232;
548 input_dev->id.vendor = 0x056a;
549 input_dev->id.version = 0x0100;
550 input_dev->dev.parent = &serio->dev;
551
552 input_dev->open = w8001_open;
553 input_dev->close = w8001_close;
554
555 input_set_drvdata(input_dev, w8001);
556
557 err = input_register_device(w8001->dev);
558 if (err)
559 goto fail3;
560
561 return 0;
562
563 fail3:
564 serio_close(serio);
565 fail2:
566 serio_set_drvdata(serio, NULL);
567 fail1:
568 input_free_device(input_dev);
569 kfree(w8001);
570 return err;
571 }
572
573 static struct serio_device_id w8001_serio_ids[] = {
574 {
575 .type = SERIO_RS232,
576 .proto = SERIO_W8001,
577 .id = SERIO_ANY,
578 .extra = SERIO_ANY,
579 },
580 { 0 }
581 };
582
583 MODULE_DEVICE_TABLE(serio, w8001_serio_ids);
584
585 static struct serio_driver w8001_drv = {
586 .driver = {
587 .name = "w8001",
588 },
589 .description = DRIVER_DESC,
590 .id_table = w8001_serio_ids,
591 .interrupt = w8001_interrupt,
592 .connect = w8001_connect,
593 .disconnect = w8001_disconnect,
594 };
595
596 module_serio_driver(w8001_drv);
Linux kernel - Deliverables
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