Commit | Line | Data |
---|---|---|
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 | 27 | static unsigned int min_width; |
ab3f4980 RR |
28 | module_param(min_width, uint, 0644); |
29 | MODULE_PARM_DESC(min_width, "Minimum touch contact width to accept."); | |
30 | ||
369db2a6 | 31 | static unsigned int min_height; |
ab3f4980 RR |
32 | module_param(min_height, uint, 0644); |
33 | MODULE_PARM_DESC(min_height, "Minimum touch contact height to accept."); | |
34 | ||
369db2a6 | 35 | static unsigned int activate_slack = 1; |
ab3f4980 RR |
36 | module_param(activate_slack, uint, 0644); |
37 | MODULE_PARM_DESC(activate_slack, "Number of touch frames to ignore at " | |
38 | "the start of touch input."); | |
39 | ||
369db2a6 | 40 | static unsigned int deactivate_slack = 4; |
ab3f4980 RR |
41 | module_param(deactivate_slack, uint, 0644); |
42 | MODULE_PARM_DESC(deactivate_slack, "Number of empty frames to ignore before " | |
43 | "deactivating touch."); | |
44 | ||
369db2a6 | 45 | static unsigned int activation_width = 64; |
ab3f4980 RR |
46 | module_param(activation_width, uint, 0644); |
47 | MODULE_PARM_DESC(activation_width, "Width threshold to immediately start " | |
48 | "processing touch events."); | |
49 | ||
369db2a6 | 50 | static unsigned int activation_height = 32; |
ab3f4980 RR |
51 | module_param(activation_height, uint, 0644); |
52 | MODULE_PARM_DESC(activation_height, "Height threshold to immediately start " | |
53 | "processing touch events."); | |
369db2a6 | 54 | |
57fd637a | 55 | struct 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 | |
93 | static 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 | ||
103 | static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL); | |
104 | ||
105 | static 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 | ||
115 | static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL); | |
116 | ||
117 | static 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 | ||
127 | static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL); | |
128 | ||
129 | static 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 | ||
139 | static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL); | |
140 | ||
141 | static 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 | ||
153 | static 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 | ||
174 | static DEVICE_ATTR(min_width, S_IWUSR | S_IRUGO, show_min_width, set_min_width); | |
175 | ||
176 | static 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 | ||
188 | static 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 | ||
209 | static DEVICE_ATTR(min_height, S_IWUSR | S_IRUGO, show_min_height, | |
210 | set_min_height); | |
211 | ||
212 | static 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 | ||
222 | static 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 | ||
242 | static DEVICE_ATTR(activate_slack, S_IWUSR | S_IRUGO, show_activate_slack, | |
243 | set_activate_slack); | |
244 | ||
245 | static 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 | ||
257 | static 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 | ||
278 | static DEVICE_ATTR(activation_width, S_IWUSR | S_IRUGO, show_activation_width, | |
279 | set_activation_width); | |
280 | ||
281 | static 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 | ||
293 | static 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 | ||
314 | static DEVICE_ATTR(activation_height, S_IWUSR | S_IRUGO, | |
315 | show_activation_height, set_activation_height); | |
316 | ||
317 | static 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 | ||
327 | static 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 | ||
352 | static DEVICE_ATTR(deactivate_slack, S_IWUSR | S_IRUGO, show_deactivate_slack, | |
353 | set_deactivate_slack); | |
354 | ||
355 | static 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 | ||
369 | static 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 |
379 | static 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 | ||
470 | static 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 | */ | |
491 | static 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 | ||
772 | static 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; |
855 | err_free: | |
856 | kfree(nd); | |
57fd637a SC |
857 | return ret; |
858 | } | |
859 | ||
860 | static 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 |
868 | static 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 | }; | |
873 | MODULE_DEVICE_TABLE(hid, ntrig_devices); | |
874 | ||
57fd637a SC |
875 | static 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 |
880 | static 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 | 891 | static int __init ntrig_init(void) |
94011f93 RR |
892 | { |
893 | return hid_register_driver(&ntrig_driver); | |
894 | } | |
895 | ||
a24f423b | 896 | static void __exit ntrig_exit(void) |
94011f93 RR |
897 | { |
898 | hid_unregister_driver(&ntrig_driver); | |
899 | } | |
900 | ||
901 | module_init(ntrig_init); | |
902 | module_exit(ntrig_exit); | |
903 | MODULE_LICENSE("GPL"); |