2 * HID driver for multitouch panels
4 * Copyright (c) 2010-2011 Stephane Chatty <chatty@enac.fr>
5 * Copyright (c) 2010-2011 Benjamin Tissoires <benjamin.tissoires@gmail.com>
6 * Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France
8 * This code is partly based on hid-egalax.c:
10 * Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
11 * Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
12 * Copyright (c) 2010 Canonical, Ltd.
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the Free
19 * Software Foundation; either version 2 of the License, or (at your option)
23 #include <linux/device.h>
24 #include <linux/hid.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/usb.h>
28 #include <linux/input/mt.h>
29 #include "usbhid/usbhid.h"
32 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
33 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
34 MODULE_DESCRIPTION("HID multitouch panels");
35 MODULE_LICENSE("GPL");
39 /* quirks to control the device */
40 #define MT_QUIRK_NOT_SEEN_MEANS_UP (1 << 0)
41 #define MT_QUIRK_SLOT_IS_CONTACTID (1 << 1)
42 #define MT_QUIRK_CYPRESS (1 << 2)
43 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER (1 << 3)
44 #define MT_QUIRK_VALID_IS_INRANGE (1 << 4)
45 #define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 5)
46 #define MT_QUIRK_EGALAX_XYZ_FIXUP (1 << 6)
50 __s32 contactid; /* the device ContactID assigned to this slot */
51 bool touch_state; /* is the touch valid? */
52 bool seen_in_this_frame;/* has this slot been updated */
56 struct mt_slot curdata; /* placeholder of incoming data */
57 struct mt_class *mtclass; /* our mt device class */
58 unsigned last_field_index; /* last field index of the report */
59 unsigned last_slot_field; /* the last field of a slot */
60 __s8 inputmode; /* InputMode HID feature, -1 if non-existent */
61 __u8 num_received; /* how many contacts we received */
62 __u8 num_expected; /* expected last contact index */
63 bool curvalid; /* is the current contact valid? */
64 struct mt_slot slots[0]; /* first slot */
68 __s32 name; /* MT_CLS */
70 __s32 sn_move; /* Signal/noise ratio for move events */
71 __s32 sn_pressure; /* Signal/noise ratio for pressure events */
75 /* classes of device behavior */
76 #define MT_CLS_DEFAULT 1
77 #define MT_CLS_DUAL_INRANGE_CONTACTID 2
78 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER 3
79 #define MT_CLS_CYPRESS 4
80 #define MT_CLS_EGALAX 5
83 * these device-dependent functions determine what slot corresponds
84 * to a valid contact that was just read.
87 static int cypress_compute_slot(struct mt_device *td)
89 if (td->curdata.contactid != 0 || td->num_received == 0)
90 return td->curdata.contactid;
95 static int find_slot_from_contactid(struct mt_device *td)
98 for (i = 0; i < td->mtclass->maxcontacts; ++i) {
99 if (td->slots[i].contactid == td->curdata.contactid &&
100 td->slots[i].touch_state)
103 for (i = 0; i < td->mtclass->maxcontacts; ++i) {
104 if (!td->slots[i].seen_in_this_frame &&
105 !td->slots[i].touch_state)
108 /* should not occurs. If this happens that means
109 * that the device sent more touches that it says
110 * in the report descriptor. It is ignored then. */
114 struct mt_class mt_classes[] = {
115 { .name = MT_CLS_DEFAULT,
116 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
118 { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
119 .quirks = MT_QUIRK_VALID_IS_INRANGE |
120 MT_QUIRK_SLOT_IS_CONTACTID,
122 { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
123 .quirks = MT_QUIRK_VALID_IS_INRANGE |
124 MT_QUIRK_SLOT_IS_CONTACTNUMBER,
126 { .name = MT_CLS_CYPRESS,
127 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
131 { .name = MT_CLS_EGALAX,
132 .quirks = MT_QUIRK_SLOT_IS_CONTACTID |
133 MT_QUIRK_VALID_IS_INRANGE |
134 MT_QUIRK_EGALAX_XYZ_FIXUP,
142 static void mt_feature_mapping(struct hid_device *hdev,
143 struct hid_field *field, struct hid_usage *usage)
145 if (usage->hid == HID_DG_INPUTMODE) {
146 struct mt_device *td = hid_get_drvdata(hdev);
147 td->inputmode = field->report->id;
151 static void set_abs(struct input_dev *input, unsigned int code,
152 struct hid_field *field, int snratio)
154 int fmin = field->logical_minimum;
155 int fmax = field->logical_maximum;
156 int fuzz = snratio ? (fmax - fmin) / snratio : 0;
157 input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
160 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
161 struct hid_field *field, struct hid_usage *usage,
162 unsigned long **bit, int *max)
164 struct mt_device *td = hid_get_drvdata(hdev);
165 struct mt_class *cls = td->mtclass;
166 __s32 quirks = cls->quirks;
168 /* Only map fields from TouchScreen or TouchPad collections.
169 * We need to ignore fields that belong to other collections
170 * such as Mouse that might have the same GenericDesktop usages. */
171 if (field->application == HID_DG_TOUCHSCREEN)
172 set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
173 else if (field->application == HID_DG_TOUCHPAD)
174 set_bit(INPUT_PROP_POINTER, hi->input->propbit);
178 switch (usage->hid & HID_USAGE_PAGE) {
181 switch (usage->hid) {
183 if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
184 field->logical_maximum = 32760;
185 hid_map_usage(hi, usage, bit, max,
186 EV_ABS, ABS_MT_POSITION_X);
187 set_abs(hi->input, ABS_MT_POSITION_X, field,
189 /* touchscreen emulation */
190 set_abs(hi->input, ABS_X, field, cls->sn_move);
191 td->last_slot_field = usage->hid;
194 if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
195 field->logical_maximum = 32760;
196 hid_map_usage(hi, usage, bit, max,
197 EV_ABS, ABS_MT_POSITION_Y);
198 set_abs(hi->input, ABS_MT_POSITION_Y, field,
200 /* touchscreen emulation */
201 set_abs(hi->input, ABS_Y, field, cls->sn_move);
202 td->last_slot_field = usage->hid;
207 case HID_UP_DIGITIZER:
208 switch (usage->hid) {
210 td->last_slot_field = usage->hid;
212 case HID_DG_CONFIDENCE:
213 td->last_slot_field = usage->hid;
215 case HID_DG_TIPSWITCH:
216 hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
217 input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
218 td->last_slot_field = usage->hid;
220 case HID_DG_CONTACTID:
221 input_mt_init_slots(hi->input,
222 td->mtclass->maxcontacts);
223 td->last_slot_field = usage->hid;
226 hid_map_usage(hi, usage, bit, max,
227 EV_ABS, ABS_MT_TOUCH_MAJOR);
228 td->last_slot_field = usage->hid;
231 hid_map_usage(hi, usage, bit, max,
232 EV_ABS, ABS_MT_TOUCH_MINOR);
233 field->logical_maximum = 1;
234 field->logical_minimum = 0;
235 set_abs(hi->input, ABS_MT_ORIENTATION, field, 0);
236 td->last_slot_field = usage->hid;
238 case HID_DG_TIPPRESSURE:
239 if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
240 field->logical_minimum = 0;
241 hid_map_usage(hi, usage, bit, max,
242 EV_ABS, ABS_MT_PRESSURE);
243 set_abs(hi->input, ABS_MT_PRESSURE, field,
245 /* touchscreen emulation */
246 set_abs(hi->input, ABS_PRESSURE, field,
248 td->last_slot_field = usage->hid;
250 case HID_DG_CONTACTCOUNT:
251 td->last_field_index = field->report->maxfield - 1;
253 case HID_DG_CONTACTMAX:
254 /* we don't set td->last_slot_field as contactcount and
255 * contact max are global to the report */
258 /* let hid-input decide for the others */
262 /* we do not want to map these: no input-oriented meaning */
269 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
270 struct hid_field *field, struct hid_usage *usage,
271 unsigned long **bit, int *max)
273 if (usage->type == EV_KEY || usage->type == EV_ABS)
274 set_bit(usage->type, hi->input->evbit);
279 static int mt_compute_slot(struct mt_device *td)
281 __s32 quirks = td->mtclass->quirks;
283 if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
284 return td->curdata.contactid;
286 if (quirks & MT_QUIRK_CYPRESS)
287 return cypress_compute_slot(td);
289 if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
290 return td->num_received;
292 return find_slot_from_contactid(td);
296 * this function is called when a whole contact has been processed,
297 * so that it can assign it to a slot and store the data there
299 static void mt_complete_slot(struct mt_device *td)
301 td->curdata.seen_in_this_frame = true;
303 int slotnum = mt_compute_slot(td);
305 if (slotnum >= 0 && slotnum < td->mtclass->maxcontacts)
306 td->slots[slotnum] = td->curdata;
313 * this function is called when a whole packet has been received and processed,
314 * so that it can decide what to send to the input layer.
316 static void mt_emit_event(struct mt_device *td, struct input_dev *input)
320 for (i = 0; i < td->mtclass->maxcontacts; ++i) {
321 struct mt_slot *s = &(td->slots[i]);
322 if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
323 !s->seen_in_this_frame) {
324 s->touch_state = false;
327 input_mt_slot(input, i);
328 input_mt_report_slot_state(input, MT_TOOL_FINGER,
330 if (s->touch_state) {
331 input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
332 input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
333 input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
334 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
335 input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
337 s->seen_in_this_frame = false;
341 input_mt_report_pointer_emulation(input, true);
343 td->num_received = 0;
348 static int mt_event(struct hid_device *hid, struct hid_field *field,
349 struct hid_usage *usage, __s32 value)
351 struct mt_device *td = hid_get_drvdata(hid);
352 __s32 quirks = td->mtclass->quirks;
354 if (hid->claimed & HID_CLAIMED_INPUT) {
355 switch (usage->hid) {
357 if (quirks & MT_QUIRK_VALID_IS_INRANGE)
358 td->curvalid = value;
360 case HID_DG_TIPSWITCH:
361 if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
362 td->curvalid = value;
363 td->curdata.touch_state = value;
365 case HID_DG_CONFIDENCE:
366 if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
367 td->curvalid = value;
369 case HID_DG_CONTACTID:
370 td->curdata.contactid = value;
372 case HID_DG_TIPPRESSURE:
373 td->curdata.p = value;
376 td->curdata.x = value;
379 td->curdata.y = value;
382 td->curdata.w = value;
385 td->curdata.h = value;
387 case HID_DG_CONTACTCOUNT:
389 * Includes multi-packet support where subsequent
390 * packets are sent with zero contactcount.
393 td->num_expected = value;
397 /* fallback to the generic hidinput handling */
401 if (usage->hid == td->last_slot_field) {
402 mt_complete_slot(td);
403 if (!td->last_field_index)
404 mt_emit_event(td, field->hidinput->input);
407 if (field->index == td->last_field_index
408 && td->num_received >= td->num_expected)
409 mt_emit_event(td, field->hidinput->input);
413 /* we have handled the hidinput part, now remains hiddev */
414 if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
415 hid->hiddev_hid_event(hid, field, usage, value);
420 static void mt_set_input_mode(struct hid_device *hdev)
422 struct mt_device *td = hid_get_drvdata(hdev);
423 struct hid_report *r;
424 struct hid_report_enum *re;
426 if (td->inputmode < 0)
429 re = &(hdev->report_enum[HID_FEATURE_REPORT]);
430 r = re->report_id_hash[td->inputmode];
432 r->field[0]->value[0] = 0x02;
433 usbhid_submit_report(hdev, r, USB_DIR_OUT);
437 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
440 struct mt_device *td;
441 struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
443 for (i = 0; mt_classes[i].name ; i++) {
444 if (id->driver_data == mt_classes[i].name) {
445 mtclass = &(mt_classes[i]);
450 /* This allows the driver to correctly support devices
451 * that emit events over several HID messages.
453 hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
455 td = kzalloc(sizeof(struct mt_device) +
456 mtclass->maxcontacts * sizeof(struct mt_slot),
459 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
462 td->mtclass = mtclass;
464 hid_set_drvdata(hdev, td);
466 ret = hid_parse(hdev);
470 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
474 mt_set_input_mode(hdev);
484 static int mt_reset_resume(struct hid_device *hdev)
486 mt_set_input_mode(hdev);
491 static void mt_remove(struct hid_device *hdev)
493 struct mt_device *td = hid_get_drvdata(hdev);
496 hid_set_drvdata(hdev, NULL);
499 static const struct hid_device_id mt_devices[] = {
502 { .driver_data = MT_CLS_CYPRESS,
503 HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
504 USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
506 /* GeneralTouch panel */
507 { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
508 HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
509 USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
512 { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
513 HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
514 USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
516 /* PixCir-based panels */
517 { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
518 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
519 USB_DEVICE_ID_HANVON_MULTITOUCH) },
520 { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
521 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
522 USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
524 /* Resistive eGalax devices */
525 { .driver_data = MT_CLS_EGALAX,
526 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
527 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
528 { .driver_data = MT_CLS_EGALAX,
529 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
530 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
532 /* Capacitive eGalax devices */
533 { .driver_data = MT_CLS_EGALAX,
534 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
535 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
536 { .driver_data = MT_CLS_EGALAX,
537 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
538 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
539 { .driver_data = MT_CLS_EGALAX,
540 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
541 USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
545 MODULE_DEVICE_TABLE(hid, mt_devices);
547 static const struct hid_usage_id mt_grabbed_usages[] = {
548 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
549 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
552 static struct hid_driver mt_driver = {
553 .name = "hid-multitouch",
554 .id_table = mt_devices,
557 .input_mapping = mt_input_mapping,
558 .input_mapped = mt_input_mapped,
559 .feature_mapping = mt_feature_mapping,
560 .usage_table = mt_grabbed_usages,
563 .reset_resume = mt_reset_resume,
567 static int __init mt_init(void)
569 return hid_register_driver(&mt_driver);
572 static void __exit mt_exit(void)
574 hid_unregister_driver(&mt_driver);
577 module_init(mt_init);
578 module_exit(mt_exit);