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Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[deliverable/linux.git] / drivers / hid / hid-ntrig.c
CommitLineData
94011f93 1/*
57fd637a 2 * HID driver for N-Trig touchscreens
94011f93 3 *
6549981b
SC		 4 * Copyright (c) 2008-2010 Rafi Rubin
5 * Copyright (c) 2009-2010 Stephane Chatty
94011f93
RR		 6 *
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 */
15
16#include <linux/device.h>
17#include <linux/hid.h>
6549981b
SC		 18#include <linux/usb.h>
19#include "usbhid/usbhid.h"
94011f93 20#include <linux/module.h>
5a0e3ad6 21#include <linux/slab.h>
94011f93
RR		 22
23#include "hid-ids.h"
24
25#define NTRIG_DUPLICATE_USAGES 0x001
26
369db2a6 27static unsigned int min_width;
ab3f4980
RR		 28module_param(min_width, uint, 0644);
29MODULE_PARM_DESC(min_width, "Minimum touch contact width to accept.");
30
369db2a6 31static unsigned int min_height;
ab3f4980
RR		 32module_param(min_height, uint, 0644);
33MODULE_PARM_DESC(min_height, "Minimum touch contact height to accept.");
34
369db2a6 35static unsigned int activate_slack = 1;
ab3f4980
RR		 36module_param(activate_slack, uint, 0644);
37MODULE_PARM_DESC(activate_slack, "Number of touch frames to ignore at "
38 "the start of touch input.");
39
369db2a6 40static unsigned int deactivate_slack = 4;
ab3f4980
RR		 41module_param(deactivate_slack, uint, 0644);
42MODULE_PARM_DESC(deactivate_slack, "Number of empty frames to ignore before "
43 "deactivating touch.");
44
369db2a6 45static unsigned int activation_width = 64;
ab3f4980
RR		 46module_param(activation_width, uint, 0644);
47MODULE_PARM_DESC(activation_width, "Width threshold to immediately start "
48 "processing touch events.");
49
369db2a6 50static unsigned int activation_height = 32;
ab3f4980
RR		 51module_param(activation_height, uint, 0644);
52MODULE_PARM_DESC(activation_height, "Height threshold to immediately start "
53 "processing touch events.");
369db2a6 54
57fd637a 55struct ntrig_data {
dbf2b17d
RR		 56 /* Incoming raw values for a single contact */
57 __u16 x, y, w, h;
58 __u16 id;
250d3775
RR		 59
60 bool tipswitch;
61 bool confidence;
62 bool first_contact_touch;
dbf2b17d
RR		 63
64 bool reading_mt;
dbf2b17d
RR		 65
66 __u8 mt_footer[4];
67 __u8 mt_foot_count;
369db2a6
RR		 68
69 /* The current activation state. */
70 __s8 act_state;
71
72 /* Empty frames to ignore before recognizing the end of activity */
73 __s8 deactivate_slack;
74
75 /* Frames to ignore before acknowledging the start of activity */
76 __s8 activate_slack;
77
78 /* Minimum size contact to accept */
79 __u16 min_width;
80 __u16 min_height;
81
82 /* Threshold to override activation slack */
83 __u16 activation_width;
84 __u16 activation_height;
85
86 __u16 sensor_logical_width;
87 __u16 sensor_logical_height;
88 __u16 sensor_physical_width;
89 __u16 sensor_physical_height;
57fd637a
SC		 90};
91
eab32f5f
RR		 92
93static ssize_t show_phys_width(struct device *dev,
94 struct device_attribute *attr,
95 char *buf)
96{
97 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
98 struct ntrig_data *nd = hid_get_drvdata(hdev);
99
100 return sprintf(buf, "%d\n", nd->sensor_physical_width);
101}
102
103static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL);
104
105static ssize_t show_phys_height(struct device *dev,
106 struct device_attribute *attr,
107 char *buf)
108{
109 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
110 struct ntrig_data *nd = hid_get_drvdata(hdev);
111
112 return sprintf(buf, "%d\n", nd->sensor_physical_height);
113}
114
115static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL);
116
117static ssize_t show_log_width(struct device *dev,
118 struct device_attribute *attr,
119 char *buf)
120{
121 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
122 struct ntrig_data *nd = hid_get_drvdata(hdev);
123
124 return sprintf(buf, "%d\n", nd->sensor_logical_width);
125}
126
127static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL);
128
129static ssize_t show_log_height(struct device *dev,
130 struct device_attribute *attr,
131 char *buf)
132{
133 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
134 struct ntrig_data *nd = hid_get_drvdata(hdev);
135
136 return sprintf(buf, "%d\n", nd->sensor_logical_height);
137}
138
139static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL);
140
141static ssize_t show_min_width(struct device *dev,
142 struct device_attribute *attr,
143 char *buf)
144{
145 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
146 struct ntrig_data *nd = hid_get_drvdata(hdev);
147
148 return sprintf(buf, "%d\n", nd->min_width *
149 nd->sensor_physical_width /
150 nd->sensor_logical_width);
151}
152
153static ssize_t set_min_width(struct device *dev,
154 struct device_attribute *attr,
155 const char *buf, size_t count)
156{
157 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
158 struct ntrig_data *nd = hid_get_drvdata(hdev);
159
160 unsigned long val;
161
162 if (strict_strtoul(buf, 0, &val))
163 return -EINVAL;
164
165 if (val > nd->sensor_physical_width)
166 return -EINVAL;
167
168 nd->min_width = val * nd->sensor_logical_width /
169 nd->sensor_physical_width;
170
171 return count;
172}
173
174static DEVICE_ATTR(min_width, S_IWUSR | S_IRUGO, show_min_width, set_min_width);
175
176static ssize_t show_min_height(struct device *dev,
177 struct device_attribute *attr,
178 char *buf)
179{
180 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
181 struct ntrig_data *nd = hid_get_drvdata(hdev);
182
183 return sprintf(buf, "%d\n", nd->min_height *
184 nd->sensor_physical_height /
185 nd->sensor_logical_height);
186}
187
188static ssize_t set_min_height(struct device *dev,
189 struct device_attribute *attr,
190 const char *buf, size_t count)
191{
192 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
193 struct ntrig_data *nd = hid_get_drvdata(hdev);
194
195 unsigned long val;
196
197 if (strict_strtoul(buf, 0, &val))
198 return -EINVAL;
199
200 if (val > nd->sensor_physical_height)
201 return -EINVAL;
202
203 nd->min_height = val * nd->sensor_logical_height /
204 nd->sensor_physical_height;
205
206 return count;
207}
208
209static DEVICE_ATTR(min_height, S_IWUSR | S_IRUGO, show_min_height,
210 set_min_height);
211
212static ssize_t show_activate_slack(struct device *dev,
213 struct device_attribute *attr,
214 char *buf)
215{
216 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
217 struct ntrig_data *nd = hid_get_drvdata(hdev);
218
219 return sprintf(buf, "%d\n", nd->activate_slack);
220}
221
222static ssize_t set_activate_slack(struct device *dev,
223 struct device_attribute *attr,
224 const char *buf, size_t count)
225{
226 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
227 struct ntrig_data *nd = hid_get_drvdata(hdev);
228
229 unsigned long val;
230
231 if (strict_strtoul(buf, 0, &val))
232 return -EINVAL;
233
234 if (val > 0x7f)
235 return -EINVAL;
236
237 nd->activate_slack = val;
238
239 return count;
240}
241
242static DEVICE_ATTR(activate_slack, S_IWUSR | S_IRUGO, show_activate_slack,
243 set_activate_slack);
244
245static ssize_t show_activation_width(struct device *dev,
246 struct device_attribute *attr,
247 char *buf)
248{
249 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
250 struct ntrig_data *nd = hid_get_drvdata(hdev);
251
252 return sprintf(buf, "%d\n", nd->activation_width *
253 nd->sensor_physical_width /
254 nd->sensor_logical_width);
255}
256
257static ssize_t set_activation_width(struct device *dev,
258 struct device_attribute *attr,
259 const char *buf, size_t count)
260{
261 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
262 struct ntrig_data *nd = hid_get_drvdata(hdev);
263
264 unsigned long val;
265
266 if (strict_strtoul(buf, 0, &val))
267 return -EINVAL;
268
269 if (val > nd->sensor_physical_width)
270 return -EINVAL;
271
272 nd->activation_width = val * nd->sensor_logical_width /
273 nd->sensor_physical_width;
274
275 return count;
276}
277
278static DEVICE_ATTR(activation_width, S_IWUSR | S_IRUGO, show_activation_width,
279 set_activation_width);
280
281static ssize_t show_activation_height(struct device *dev,
282 struct device_attribute *attr,
283 char *buf)
284{
285 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
286 struct ntrig_data *nd = hid_get_drvdata(hdev);
287
288 return sprintf(buf, "%d\n", nd->activation_height *
289 nd->sensor_physical_height /
290 nd->sensor_logical_height);
291}
292
293static ssize_t set_activation_height(struct device *dev,
294 struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
298 struct ntrig_data *nd = hid_get_drvdata(hdev);
299
300 unsigned long val;
301
302 if (strict_strtoul(buf, 0, &val))
303 return -EINVAL;
304
305 if (val > nd->sensor_physical_height)
306 return -EINVAL;
307
308 nd->activation_height = val * nd->sensor_logical_height /
309 nd->sensor_physical_height;
310
311 return count;
312}
313
314static DEVICE_ATTR(activation_height, S_IWUSR | S_IRUGO,
315 show_activation_height, set_activation_height);
316
317static ssize_t show_deactivate_slack(struct device *dev,
318 struct device_attribute *attr,
319 char *buf)
320{
321 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
322 struct ntrig_data *nd = hid_get_drvdata(hdev);
323
324 return sprintf(buf, "%d\n", -nd->deactivate_slack);
325}
326
327static ssize_t set_deactivate_slack(struct device *dev,
328 struct device_attribute *attr,
329 const char *buf, size_t count)
330{
331 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
332 struct ntrig_data *nd = hid_get_drvdata(hdev);
333
334 unsigned long val;
335
336 if (strict_strtoul(buf, 0, &val))
337 return -EINVAL;
338
339 /*
340 * No more than 8 terminal frames have been observed so far
341 * and higher slack is highly likely to leave the single
342 * touch emulation stuck down.
343 */
344 if (val > 7)
345 return -EINVAL;
346
347 nd->deactivate_slack = -val;
348
349 return count;
350}
351
352static DEVICE_ATTR(deactivate_slack, S_IWUSR | S_IRUGO, show_deactivate_slack,
353 set_deactivate_slack);
354
355static struct attribute *sysfs_attrs[] = {
356 &dev_attr_sensor_physical_width.attr,
357 &dev_attr_sensor_physical_height.attr,
358 &dev_attr_sensor_logical_width.attr,
359 &dev_attr_sensor_logical_height.attr,
360 &dev_attr_min_height.attr,
361 &dev_attr_min_width.attr,
362 &dev_attr_activate_slack.attr,
363 &dev_attr_activation_width.attr,
364 &dev_attr_activation_height.attr,
365 &dev_attr_deactivate_slack.attr,
366 NULL
367};
368
369static struct attribute_group ntrig_attribute_group = {
370 .attrs = sysfs_attrs
371};
372
57fd637a
SC		 373/*
374 * this driver is aimed at two firmware versions in circulation:
375 * - dual pen/finger single touch
376 * - finger multitouch, pen not working
377 */
378
94011f93
RR		 379static int ntrig_input_mapping(struct hid_device *hdev, struct hid_input *hi,
380 struct hid_field *field, struct hid_usage *usage,
381 unsigned long **bit, int *max)
382{
369db2a6
RR		 383 struct ntrig_data *nd = hid_get_drvdata(hdev);
384
dbf2b17d
RR		 385 /* No special mappings needed for the pen and single touch */
386 if (field->physical)
943ed464
RR		 387 return 0;
388
57fd637a 389 switch (usage->hid & HID_USAGE_PAGE) {
57fd637a
SC		 390 case HID_UP_GENDESK:
391 switch (usage->hid) {
392 case HID_GD_X:
393 hid_map_usage(hi, usage, bit, max,
394 EV_ABS, ABS_MT_POSITION_X);
395 input_set_abs_params(hi->input, ABS_X,
396 field->logical_minimum,
397 field->logical_maximum, 0, 0);
369db2a6
RR		 398
399 if (!nd->sensor_logical_width) {
400 nd->sensor_logical_width =
401 field->logical_maximum -
402 field->logical_minimum;
403 nd->sensor_physical_width =
404 field->physical_maximum -
405 field->physical_minimum;
406 nd->activation_width = activation_width *
407 nd->sensor_logical_width /
408 nd->sensor_physical_width;
409 nd->min_width = min_width *
410 nd->sensor_logical_width /
411 nd->sensor_physical_width;
412 }
57fd637a
SC		 413 return 1;
414 case HID_GD_Y:
415 hid_map_usage(hi, usage, bit, max,
416 EV_ABS, ABS_MT_POSITION_Y);
417 input_set_abs_params(hi->input, ABS_Y,
418 field->logical_minimum,
419 field->logical_maximum, 0, 0);
369db2a6
RR		 420
421 if (!nd->sensor_logical_height) {
422 nd->sensor_logical_height =
423 field->logical_maximum -
424 field->logical_minimum;
425 nd->sensor_physical_height =
426 field->physical_maximum -
427 field->physical_minimum;
428 nd->activation_height = activation_height *
429 nd->sensor_logical_height /
430 nd->sensor_physical_height;
431 nd->min_height = min_height *
432 nd->sensor_logical_height /
433 nd->sensor_physical_height;
434 }
57fd637a
SC		 435 return 1;
436 }
437 return 0;
438
439 case HID_UP_DIGITIZER:
440 switch (usage->hid) {
441 /* we do not want to map these for now */
dbf2b17d 442 case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
57fd637a
SC		 443 case HID_DG_INPUTMODE:
444 case HID_DG_DEVICEINDEX:
57fd637a
SC		 445 case HID_DG_CONTACTMAX:
446 return -1;
447
57fd637a
SC		 448 /* width/height mapped on TouchMajor/TouchMinor/Orientation */
449 case HID_DG_WIDTH:
450 hid_map_usage(hi, usage, bit, max,
451 EV_ABS, ABS_MT_TOUCH_MAJOR);
452 return 1;
453 case HID_DG_HEIGHT:
454 hid_map_usage(hi, usage, bit, max,
455 EV_ABS, ABS_MT_TOUCH_MINOR);
456 input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
457 0, 1, 0, 0);
458 return 1;
459 }
460 return 0;
461
462 case 0xff000000:
463 /* we do not want to map these: no input-oriented meaning */
464 return -1;
94011f93 465 }
57fd637a 466
94011f93
RR		 467 return 0;
468}
469
470static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
471 struct hid_field *field, struct hid_usage *usage,
472 unsigned long **bit, int *max)
473{
dbf2b17d
RR		 474 /* No special mappings needed for the pen and single touch */
475 if (field->physical)
943ed464 476 return 0;
b0549cf1 477
94011f93
RR		 478 if (usage->type == EV_KEY || usage->type == EV_REL
479 || usage->type == EV_ABS)
480 clear_bit(usage->code, *bit);
481
482 return 0;
483}
57fd637a
SC		 484
485/*
486 * this function is called upon all reports
487 * so that we can filter contact point information,
488 * decide whether we are in multi or single touch mode
489 * and call input_mt_sync after each point if necessary
490 */
491static int ntrig_event (struct hid_device *hid, struct hid_field *field,
492 struct hid_usage *usage, __s32 value)
493{
494 struct input_dev *input = field->hidinput->input;
495 struct ntrig_data *nd = hid_get_drvdata(hid);
496
943ed464
RR		 497 /* No special handling needed for the pen */
498 if (field->application == HID_DG_PEN)
499 return 0;
500
57fd637a
SC		 501 if (hid->claimed & HID_CLAIMED_INPUT) {
502 switch (usage->hid) {
dbf2b17d
RR		 503 case 0xff000001:
504 /* Tag indicating the start of a multitouch group */
505 nd->reading_mt = 1;
250d3775 506 nd->first_contact_touch = 0;
dbf2b17d 507 break;
2886539d 508 case HID_DG_TIPSWITCH:
250d3775 509 nd->tipswitch = value;
2886539d
RR		 510 /* Prevent emission of touch until validated */
511 return 1;
dbf2b17d
RR		 512 case HID_DG_CONFIDENCE:
513 nd->confidence = value;
514 break;
57fd637a
SC		 515 case HID_GD_X:
516 nd->x = value;
dbf2b17d
RR		 517 /* Clear the contact footer */
518 nd->mt_foot_count = 0;
57fd637a
SC		 519 break;
520 case HID_GD_Y:
521 nd->y = value;
522 break;
523 case HID_DG_CONTACTID:
524 nd->id = value;
57fd637a
SC		 525 break;
526 case HID_DG_WIDTH:
527 nd->w = value;
528 break;
529 case HID_DG_HEIGHT:
530 nd->h = value;
531 /*
532 * when in single touch mode, this is the last
533 * report received in a finger event. We want
534 * to emit a normal (X, Y) position
535 */
dbf2b17d 536 if (!nd->reading_mt) {
250d3775
RR		 537 /*
538 * TipSwitch indicates the presence of a
539 * finger in single touch mode.
540 */
2170c5a8 541 input_report_key(input, BTN_TOUCH,
250d3775
RR		 542 nd->tipswitch);
543 input_report_key(input, BTN_TOOL_DOUBLETAP,
544 nd->tipswitch);
57fd637a
SC		 545 input_event(input, EV_ABS, ABS_X, nd->x);
546 input_event(input, EV_ABS, ABS_Y, nd->y);
57fd637a
SC		 547 }
548 break;
549 case 0xff000002:
550 /*
551 * we receive this when the device is in multitouch
552 * mode. The first of the three values tagged with
553 * this usage tells if the contact point is real
554 * or a placeholder
555 */
dbf2b17d
RR		 556
557 /* Shouldn't get more than 4 footer packets, so skip */
558 if (nd->mt_foot_count >= 4)
559 break;
560
561 nd->mt_footer[nd->mt_foot_count++] = value;
562
563 /* if the footer isn't complete break */
564 if (nd->mt_foot_count != 4)
565 break;
566
369db2a6 567 /* Pen activity signal. */
dbf2b17d 568 if (nd->mt_footer[2]) {
369db2a6
RR		 569 /*
570 * When the pen deactivates touch, we see a
571 * bogus frame with ContactCount > 0.
572 * We can
573 * save a bit of work by ensuring act_state < 0
574 * even if deactivation slack is turned off.
575 */
576 nd->act_state = deactivate_slack - 1;
dbf2b17d 577 nd->confidence = 0;
57fd637a 578 break;
dbf2b17d
RR		 579 }
580
369db2a6
RR		 581 /*
582 * The first footer value indicates the presence of a
583 * finger.
584 */
585 if (nd->mt_footer[0]) {
586 /*
587 * We do not want to process contacts under
588 * the size threshold, but do not want to
589 * ignore them for activation state
590 */
591 if (nd->w < nd->min_width ||
592 nd->h < nd->min_height)
593 nd->confidence = 0;
594 } else
dbf2b17d 595 break;
369db2a6
RR		 596
597 if (nd->act_state > 0) {
598 /*
599 * Contact meets the activation size threshold
600 */
601 if (nd->w >= nd->activation_width &&
602 nd->h >= nd->activation_height) {
603 if (nd->id)
604 /*
605 * first contact, activate now
606 */
607 nd->act_state = 0;
608 else {
609 /*
610 * avoid corrupting this frame
611 * but ensure next frame will
612 * be active
613 */
614 nd->act_state = 1;
615 break;
616 }
617 } else
618 /*
619 * Defer adjusting the activation state
620 * until the end of the frame.
621 */
622 break;
dbf2b17d
RR		 623 }
624
369db2a6
RR		 625 /* Discarding this contact */
626 if (!nd->confidence)
627 break;
628
57fd637a
SC		 629 /* emit a normal (X, Y) for the first point only */
630 if (nd->id == 0) {
250d3775
RR		 631 /*
632 * TipSwitch is superfluous in multitouch
633 * mode. The footer events tell us
634 * if there is a finger on the screen or
635 * not.
636 */
637 nd->first_contact_touch = nd->confidence;
57fd637a
SC		 638 input_event(input, EV_ABS, ABS_X, nd->x);
639 input_event(input, EV_ABS, ABS_Y, nd->y);
640 }
369db2a6
RR		 641
642 /* Emit MT events */
57fd637a
SC		 643 input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
644 input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
369db2a6
RR		 645
646 /*
647 * Translate from height and width to size
648 * and orientation.
649 */
57fd637a
SC		 650 if (nd->w > nd->h) {
651 input_event(input, EV_ABS,
652 ABS_MT_ORIENTATION, 1);
653 input_event(input, EV_ABS,
654 ABS_MT_TOUCH_MAJOR, nd->w);
655 input_event(input, EV_ABS,
656 ABS_MT_TOUCH_MINOR, nd->h);
657 } else {
658 input_event(input, EV_ABS,
659 ABS_MT_ORIENTATION, 0);
660 input_event(input, EV_ABS,
661 ABS_MT_TOUCH_MAJOR, nd->h);
662 input_event(input, EV_ABS,
663 ABS_MT_TOUCH_MINOR, nd->w);
664 }
665 input_mt_sync(field->hidinput->input);
dbf2b17d
RR		 666 break;
667
668 case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
369db2a6 669 if (!nd->reading_mt) /* Just to be sure */
dbf2b17d
RR		 670 break;
671
672 nd->reading_mt = 0;
673
369db2a6
RR		 674
675 /*
676 * Activation state machine logic:
677 *
678 * Fundamental states:
679 * state > 0: Inactive
680 * state <= 0: Active
681 * state < -deactivate_slack:
682 * Pen termination of touch
683 *
684 * Specific values of interest
685 * state == activate_slack
686 * no valid input since the last reset
687 *
688 * state == 0
689 * general operational state
690 *
691 * state == -deactivate_slack
692 * read sufficient empty frames to accept
693 * the end of input and reset
694 */
695
696 if (nd->act_state > 0) { /* Currently inactive */
697 if (value)
698 /*
699 * Consider each live contact as
700 * evidence of intentional activity.
701 */
702 nd->act_state = (nd->act_state > value)
703 ? nd->act_state - value
704 : 0;
705 else
706 /*
707 * Empty frame before we hit the
708 * activity threshold, reset.
709 */
710 nd->act_state = nd->activate_slack;
711
712 /*
713 * Entered this block inactive and no
714 * coordinates sent this frame, so hold off
715 * on button state.
716 */
717 break;
718 } else { /* Currently active */
719 if (value && nd->act_state >=
720 nd->deactivate_slack)
721 /*
722 * Live point: clear accumulated
723 * deactivation count.
724 */
725 nd->act_state = 0;
726 else if (nd->act_state <= nd->deactivate_slack)
727 /*
728 * We've consumed the deactivation
729 * slack, time to deactivate and reset.
730 */
731 nd->act_state =
732 nd->activate_slack;
733 else { /* Move towards deactivation */
734 nd->act_state--;
735 break;
736 }
737 }
738
739 if (nd->first_contact_touch && nd->act_state <= 0) {
740 /*
741 * Check to see if we're ready to start
742 * emitting touch events.
743 *
744 * Note: activation slack will decrease over
745 * the course of the frame, and it will be
746 * inconsistent from the start to the end of
747 * the frame. However if the frame starts
748 * with slack, first_contact_touch will still
749 * be 0 and we will not get to this point.
750 */
ed7e2ca2 751 input_report_key(input, BTN_TOOL_DOUBLETAP, 1);
dbf2b17d
RR		 752 input_report_key(input, BTN_TOUCH, 1);
753 } else {
ed7e2ca2 754 input_report_key(input, BTN_TOOL_DOUBLETAP, 0);
2886539d 755 input_report_key(input, BTN_TOUCH, 0);
dbf2b17d 756 }
57fd637a
SC		 757 break;
758
759 default:
369db2a6 760 /* fall-back to the generic hidinput handling */
57fd637a
SC		 761 return 0;
762 }
763 }
764
765 /* we have handled the hidinput part, now remains hiddev */
943ed464
RR		 766 if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
767 hid->hiddev_hid_event(hid, field, usage, value);
57fd637a
SC		 768
769 return 1;
770}
771
772static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
773{
774 int ret;
775 struct ntrig_data *nd;
943ed464
RR		 776 struct hid_input *hidinput;
777 struct input_dev *input;
6549981b 778 struct hid_report *report;
943ed464
RR		 779
780 if (id->driver_data)
781 hdev->quirks |= HID_QUIRK_MULTI_INPUT;
57fd637a
SC		 782
783 nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
784 if (!nd) {
785 dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
786 return -ENOMEM;
787 }
dbf2b17d
RR		 788
789 nd->reading_mt = 0;
369db2a6
RR		 790 nd->min_width = 0;
791 nd->min_height = 0;
792 nd->activate_slack = activate_slack;
793 nd->act_state = activate_slack;
794 nd->deactivate_slack = -deactivate_slack;
795 nd->sensor_logical_width = 0;
796 nd->sensor_logical_height = 0;
797 nd->sensor_physical_width = 0;
798 nd->sensor_physical_height = 0;
799
57fd637a
SC		 800 hid_set_drvdata(hdev, nd);
801
802 ret = hid_parse(hdev);
943ed464
RR		 803 if (ret) {
804 dev_err(&hdev->dev, "parse failed\n");
805 goto err_free;
806 }
807
808 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
809 if (ret) {
810 dev_err(&hdev->dev, "hw start failed\n");
811 goto err_free;
812 }
57fd637a 813
837b4753 814
943ed464 815 list_for_each_entry(hidinput, &hdev->inputs, list) {
2886539d
RR		 816 if (hidinput->report->maxfield < 1)
817 continue;
818
943ed464
RR		 819 input = hidinput->input;
820 switch (hidinput->report->field[0]->application) {
821 case HID_DG_PEN:
822 input->name = "N-Trig Pen";
823 break;
824 case HID_DG_TOUCHSCREEN:
2886539d
RR		 825 /* These keys are redundant for fingers, clear them
826 * to prevent incorrect identification */
dbf2b17d 827 __clear_bit(BTN_TOOL_PEN, input->keybit);
2886539d
RR		 828 __clear_bit(BTN_TOOL_FINGER, input->keybit);
829 __clear_bit(BTN_0, input->keybit);
dbf2b17d 830 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
943ed464
RR		 831 /*
832 * The physical touchscreen (single touch)
833 * input has a value for physical, whereas
834 * the multitouch only has logical input
835 * fields.
836 */
837 input->name =
838 (hidinput->report->field[0]
839 ->physical) ?
840 "N-Trig Touchscreen" :
841 "N-Trig MultiTouch";
842 break;
843 }
844 }
845
c0858552
JK		 846 /* This is needed for devices with more recent firmware versions */
847 report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0x0a];
6549981b
SC		 848 if (report)
849 usbhid_submit_report(hdev, report, USB_DIR_OUT);
850
eab32f5f
RR		 851 ret = sysfs_create_group(&hdev->dev.kobj,
852 &ntrig_attribute_group);
6549981b 853
943ed464
RR		 854 return 0;
855err_free:
856 kfree(nd);
57fd637a
SC		 857 return ret;
858}
859
860static void ntrig_remove(struct hid_device *hdev)
861{
eab32f5f
RR		 862 sysfs_remove_group(&hdev->dev.kobj,
863 &ntrig_attribute_group);
57fd637a
SC		 864 hid_hw_stop(hdev);
865 kfree(hid_get_drvdata(hdev));
866}
867
94011f93
RR		 868static const struct hid_device_id ntrig_devices[] = {
869 { HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
870 .driver_data = NTRIG_DUPLICATE_USAGES },
871 { }
872};
873MODULE_DEVICE_TABLE(hid, ntrig_devices);
874
57fd637a
SC		 875static const struct hid_usage_id ntrig_grabbed_usages[] = {
876 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
943ed464 877 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 }
57fd637a
SC		 878};
879
94011f93
RR		 880static struct hid_driver ntrig_driver = {
881 .name = "ntrig",
882 .id_table = ntrig_devices,
57fd637a
SC		 883 .probe = ntrig_probe,
884 .remove = ntrig_remove,
94011f93
RR		 885 .input_mapping = ntrig_input_mapping,
886 .input_mapped = ntrig_input_mapped,
57fd637a
SC		 887 .usage_table = ntrig_grabbed_usages,
888 .event = ntrig_event,
94011f93
RR		 889};
890
a24f423b 891static int __init ntrig_init(void)
94011f93
RR		 892{
893 return hid_register_driver(&ntrig_driver);
894}
895
a24f423b 896static void __exit ntrig_exit(void)
94011f93
RR		 897{
898 hid_unregister_driver(&ntrig_driver);
899}
900
901module_init(ntrig_init);
902module_exit(ntrig_exit);
903MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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