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Linux/drivers/hid/hid-multitouch.c

  1 /*
  2  *  HID driver for multitouch panels
  3  *
  4  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
  5  *  Copyright (c) 2010-2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  6  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
  7  *  Copyright (c) 2012-2013 Red Hat, Inc
  8  *
  9  *  This code is partly based on hid-egalax.c:
 10  *
 11  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
 12  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
 13  *  Copyright (c) 2010 Canonical, Ltd.
 14  *
 15  *  This code is partly based on hid-3m-pct.c:
 16  *
 17  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
 18  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
 19  *  Copyright (c) 2010      Canonical, Ltd.
 20  *
 21  */
 22 
 23 /*
 24  * This program is free software; you can redistribute it and/or modify it
 25  * under the terms of the GNU General Public License as published by the Free
 26  * Software Foundation; either version 2 of the License, or (at your option)
 27  * any later version.
 28  */
 29 
 30 /*
 31  * This driver is regularly tested thanks to the tool hid-test[1].
 32  * This tool relies on hid-replay[2] and a database of hid devices[3].
 33  * Please run these regression tests before patching this module so that
 34  * your patch won't break existing known devices.
 35  *
 36  * [1] https://github.com/bentiss/hid-test
 37  * [2] https://github.com/bentiss/hid-replay
 38  * [3] https://github.com/bentiss/hid-devices
 39  */
 40 
 41 #include <linux/device.h>
 42 #include <linux/hid.h>
 43 #include <linux/module.h>
 44 #include <linux/slab.h>
 45 #include <linux/usb.h>
 46 #include <linux/input/mt.h>
 47 #include <linux/string.h>
 48 
 49 
 50 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
 51 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 52 MODULE_DESCRIPTION("HID multitouch panels");
 53 MODULE_LICENSE("GPL");
 54 
 55 #include "hid-ids.h"
 56 
 57 /* quirks to control the device */
 58 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
 59 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
 60 #define MT_QUIRK_CYPRESS                (1 << 2)
 61 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
 62 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
 63 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
 64 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
 65 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
 66 #define MT_QUIRK_NO_AREA                (1 << 9)
 67 #define MT_QUIRK_IGNORE_DUPLICATES      (1 << 10)
 68 #define MT_QUIRK_HOVERING               (1 << 11)
 69 #define MT_QUIRK_CONTACT_CNT_ACCURATE   (1 << 12)
 70 #define MT_QUIRK_FORCE_GET_FEATURE      (1 << 13)
 71 
 72 #define MT_INPUTMODE_TOUCHSCREEN        0x02
 73 #define MT_INPUTMODE_TOUCHPAD           0x03
 74 
 75 struct mt_slot {
 76         __s32 x, y, cx, cy, p, w, h;
 77         __s32 contactid;        /* the device ContactID assigned to this slot */
 78         bool touch_state;       /* is the touch valid? */
 79         bool inrange_state;     /* is the finger in proximity of the sensor? */
 80 };
 81 
 82 struct mt_class {
 83         __s32 name;     /* MT_CLS */
 84         __s32 quirks;
 85         __s32 sn_move;  /* Signal/noise ratio for move events */
 86         __s32 sn_width; /* Signal/noise ratio for width events */
 87         __s32 sn_height;        /* Signal/noise ratio for height events */
 88         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
 89         __u8 maxcontacts;
 90         bool is_indirect;       /* true for touchpads */
 91         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
 92 };
 93 
 94 struct mt_fields {
 95         unsigned usages[HID_MAX_FIELDS];
 96         unsigned int length;
 97 };
 98 
 99 struct mt_device {
100         struct mt_slot curdata; /* placeholder of incoming data */
101         struct mt_class mtclass;        /* our mt device class */
102         struct mt_fields *fields;       /* temporary placeholder for storing the
103                                            multitouch fields */
104         int cc_index;   /* contact count field index in the report */
105         int cc_value_index;     /* contact count value index in the field */
106         unsigned last_slot_field;       /* the last field of a slot */
107         unsigned mt_report_id;  /* the report ID of the multitouch device */
108         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
109         __s16 inputmode_index;  /* InputMode HID feature index in the report */
110         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
111                                    -1 if non-existent */
112         __u8 inputmode_value;  /* InputMode HID feature value */
113         __u8 num_received;      /* how many contacts we received */
114         __u8 num_expected;      /* expected last contact index */
115         __u8 maxcontacts;
116         __u8 touches_by_report; /* how many touches are present in one report:
117                                 * 1 means we should use a serial protocol
118                                 * > 1 means hybrid (multitouch) protocol */
119         bool serial_maybe;      /* need to check for serial protocol */
120         bool curvalid;          /* is the current contact valid? */
121         unsigned mt_flags;      /* flags to pass to input-mt */
122 };
123 
124 static void mt_post_parse_default_settings(struct mt_device *td);
125 static void mt_post_parse(struct mt_device *td);
126 
127 /* classes of device behavior */
128 #define MT_CLS_DEFAULT                          0x0001
129 
130 #define MT_CLS_SERIAL                           0x0002
131 #define MT_CLS_CONFIDENCE                       0x0003
132 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
133 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
134 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
135 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
136 /* reserved                                     0x0008 */
137 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
138 #define MT_CLS_NSMU                             0x000a
139 /* reserved                                     0x0010 */
140 /* reserved                                     0x0011 */
141 #define MT_CLS_WIN_8                            0x0012
142 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
143 
144 /* vendor specific classes */
145 #define MT_CLS_3M                               0x0101
146 /* reserved                                     0x0102 */
147 #define MT_CLS_EGALAX                           0x0103
148 #define MT_CLS_EGALAX_SERIAL                    0x0104
149 #define MT_CLS_TOPSEED                          0x0105
150 #define MT_CLS_PANASONIC                        0x0106
151 #define MT_CLS_FLATFROG                         0x0107
152 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
153 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
154 #define MT_CLS_VTL                              0x0110
155 
156 #define MT_DEFAULT_MAXCONTACT   10
157 #define MT_MAX_MAXCONTACT       250
158 
159 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
160 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
161 
162 /*
163  * these device-dependent functions determine what slot corresponds
164  * to a valid contact that was just read.
165  */
166 
167 static int cypress_compute_slot(struct mt_device *td)
168 {
169         if (td->curdata.contactid != 0 || td->num_received == 0)
170                 return td->curdata.contactid;
171         else
172                 return -1;
173 }
174 
175 static struct mt_class mt_classes[] = {
176         { .name = MT_CLS_DEFAULT,
177                 .quirks = MT_QUIRK_ALWAYS_VALID |
178                         MT_QUIRK_CONTACT_CNT_ACCURATE },
179         { .name = MT_CLS_NSMU,
180                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
181         { .name = MT_CLS_SERIAL,
182                 .quirks = MT_QUIRK_ALWAYS_VALID},
183         { .name = MT_CLS_CONFIDENCE,
184                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
185         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
186                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
187                         MT_QUIRK_SLOT_IS_CONTACTID },
188         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
189                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
190                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
191         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
192                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
193                         MT_QUIRK_SLOT_IS_CONTACTID,
194                 .maxcontacts = 2 },
195         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
196                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
197                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
198                 .maxcontacts = 2 },
199         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
200                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
201                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
202         { .name = MT_CLS_WIN_8,
203                 .quirks = MT_QUIRK_ALWAYS_VALID |
204                         MT_QUIRK_IGNORE_DUPLICATES |
205                         MT_QUIRK_HOVERING |
206                         MT_QUIRK_CONTACT_CNT_ACCURATE },
207         { .name = MT_CLS_EXPORT_ALL_INPUTS,
208                 .quirks = MT_QUIRK_ALWAYS_VALID |
209                         MT_QUIRK_CONTACT_CNT_ACCURATE,
210                 .export_all_inputs = true },
211 
212         /*
213          * vendor specific classes
214          */
215         { .name = MT_CLS_3M,
216                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
217                         MT_QUIRK_SLOT_IS_CONTACTID,
218                 .sn_move = 2048,
219                 .sn_width = 128,
220                 .sn_height = 128,
221                 .maxcontacts = 60,
222         },
223         { .name = MT_CLS_EGALAX,
224                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
225                         MT_QUIRK_VALID_IS_INRANGE,
226                 .sn_move = 4096,
227                 .sn_pressure = 32,
228         },
229         { .name = MT_CLS_EGALAX_SERIAL,
230                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
231                         MT_QUIRK_ALWAYS_VALID,
232                 .sn_move = 4096,
233                 .sn_pressure = 32,
234         },
235         { .name = MT_CLS_TOPSEED,
236                 .quirks = MT_QUIRK_ALWAYS_VALID,
237                 .is_indirect = true,
238                 .maxcontacts = 2,
239         },
240         { .name = MT_CLS_PANASONIC,
241                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
242                 .maxcontacts = 4 },
243         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
244                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
245                         MT_QUIRK_VALID_IS_INRANGE |
246                         MT_QUIRK_SLOT_IS_CONTACTID,
247                 .maxcontacts = 2
248         },
249         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
250                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
251                         MT_QUIRK_SLOT_IS_CONTACTID
252         },
253 
254         { .name = MT_CLS_FLATFROG,
255                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
256                         MT_QUIRK_NO_AREA,
257                 .sn_move = 2048,
258                 .maxcontacts = 40,
259         },
260         { .name = MT_CLS_VTL,
261                 .quirks = MT_QUIRK_ALWAYS_VALID |
262                         MT_QUIRK_CONTACT_CNT_ACCURATE |
263                         MT_QUIRK_FORCE_GET_FEATURE,
264         },
265         { }
266 };
267 
268 static ssize_t mt_show_quirks(struct device *dev,
269                            struct device_attribute *attr,
270                            char *buf)
271 {
272         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
273         struct mt_device *td = hid_get_drvdata(hdev);
274 
275         return sprintf(buf, "%u\n", td->mtclass.quirks);
276 }
277 
278 static ssize_t mt_set_quirks(struct device *dev,
279                           struct device_attribute *attr,
280                           const char *buf, size_t count)
281 {
282         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
283         struct mt_device *td = hid_get_drvdata(hdev);
284 
285         unsigned long val;
286 
287         if (kstrtoul(buf, 0, &val))
288                 return -EINVAL;
289 
290         td->mtclass.quirks = val;
291 
292         if (td->cc_index < 0)
293                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
294 
295         return count;
296 }
297 
298 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
299 
300 static struct attribute *sysfs_attrs[] = {
301         &dev_attr_quirks.attr,
302         NULL
303 };
304 
305 static struct attribute_group mt_attribute_group = {
306         .attrs = sysfs_attrs
307 };
308 
309 static void mt_feature_mapping(struct hid_device *hdev,
310                 struct hid_field *field, struct hid_usage *usage)
311 {
312         struct mt_device *td = hid_get_drvdata(hdev);
313 
314         switch (usage->hid) {
315         case HID_DG_INPUTMODE:
316                 /* Ignore if value index is out of bounds. */
317                 if (usage->usage_index >= field->report_count) {
318                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
319                         break;
320                 }
321 
322                 td->inputmode = field->report->id;
323                 td->inputmode_index = usage->usage_index;
324 
325                 break;
326         case HID_DG_CONTACTMAX:
327                 td->maxcontact_report_id = field->report->id;
328                 td->maxcontacts = field->value[0];
329                 if (!td->maxcontacts &&
330                     field->logical_maximum <= MT_MAX_MAXCONTACT)
331                         td->maxcontacts = field->logical_maximum;
332                 if (td->mtclass.maxcontacts)
333                         /* check if the maxcontacts is given by the class */
334                         td->maxcontacts = td->mtclass.maxcontacts;
335 
336                 break;
337         }
338 }
339 
340 static void set_abs(struct input_dev *input, unsigned int code,
341                 struct hid_field *field, int snratio)
342 {
343         int fmin = field->logical_minimum;
344         int fmax = field->logical_maximum;
345         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
346         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
347         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
348 }
349 
350 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
351                 struct hid_input *hi)
352 {
353         struct mt_fields *f = td->fields;
354 
355         if (f->length >= HID_MAX_FIELDS)
356                 return;
357 
358         f->usages[f->length++] = usage->hid;
359 }
360 
361 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
362                 struct hid_field *field, struct hid_usage *usage,
363                 unsigned long **bit, int *max)
364 {
365         struct mt_device *td = hid_get_drvdata(hdev);
366         struct mt_class *cls = &td->mtclass;
367         int code;
368         struct hid_usage *prev_usage = NULL;
369 
370         if (field->application == HID_DG_TOUCHSCREEN)
371                 td->mt_flags |= INPUT_MT_DIRECT;
372 
373         /*
374          * Model touchscreens providing buttons as touchpads.
375          */
376         if (field->application == HID_DG_TOUCHPAD ||
377             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
378                 td->mt_flags |= INPUT_MT_POINTER;
379                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
380         }
381 
382         if (usage->usage_index)
383                 prev_usage = &field->usage[usage->usage_index - 1];
384 
385         switch (usage->hid & HID_USAGE_PAGE) {
386 
387         case HID_UP_GENDESK:
388                 switch (usage->hid) {
389                 case HID_GD_X:
390                         if (prev_usage && (prev_usage->hid == usage->hid)) {
391                                 hid_map_usage(hi, usage, bit, max,
392                                         EV_ABS, ABS_MT_TOOL_X);
393                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
394                                         cls->sn_move);
395                         } else {
396                                 hid_map_usage(hi, usage, bit, max,
397                                         EV_ABS, ABS_MT_POSITION_X);
398                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
399                                         cls->sn_move);
400                         }
401 
402                         mt_store_field(usage, td, hi);
403                         return 1;
404                 case HID_GD_Y:
405                         if (prev_usage && (prev_usage->hid == usage->hid)) {
406                                 hid_map_usage(hi, usage, bit, max,
407                                         EV_ABS, ABS_MT_TOOL_Y);
408                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
409                                         cls->sn_move);
410                         } else {
411                                 hid_map_usage(hi, usage, bit, max,
412                                         EV_ABS, ABS_MT_POSITION_Y);
413                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
414                                         cls->sn_move);
415                         }
416 
417                         mt_store_field(usage, td, hi);
418                         return 1;
419                 }
420                 return 0;
421 
422         case HID_UP_DIGITIZER:
423                 switch (usage->hid) {
424                 case HID_DG_INRANGE:
425                         if (cls->quirks & MT_QUIRK_HOVERING) {
426                                 hid_map_usage(hi, usage, bit, max,
427                                         EV_ABS, ABS_MT_DISTANCE);
428                                 input_set_abs_params(hi->input,
429                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
430                         }
431                         mt_store_field(usage, td, hi);
432                         return 1;
433                 case HID_DG_CONFIDENCE:
434                         mt_store_field(usage, td, hi);
435                         return 1;
436                 case HID_DG_TIPSWITCH:
437                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
438                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
439                         mt_store_field(usage, td, hi);
440                         return 1;
441                 case HID_DG_CONTACTID:
442                         mt_store_field(usage, td, hi);
443                         td->touches_by_report++;
444                         td->mt_report_id = field->report->id;
445                         return 1;
446                 case HID_DG_WIDTH:
447                         hid_map_usage(hi, usage, bit, max,
448                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
449                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
450                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
451                                         cls->sn_width);
452                         mt_store_field(usage, td, hi);
453                         return 1;
454                 case HID_DG_HEIGHT:
455                         hid_map_usage(hi, usage, bit, max,
456                                         EV_ABS, ABS_MT_TOUCH_MINOR);
457                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
458                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
459                                         cls->sn_height);
460                                 input_set_abs_params(hi->input,
461                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
462                         }
463                         mt_store_field(usage, td, hi);
464                         return 1;
465                 case HID_DG_TIPPRESSURE:
466                         hid_map_usage(hi, usage, bit, max,
467                                         EV_ABS, ABS_MT_PRESSURE);
468                         set_abs(hi->input, ABS_MT_PRESSURE, field,
469                                 cls->sn_pressure);
470                         mt_store_field(usage, td, hi);
471                         return 1;
472                 case HID_DG_CONTACTCOUNT:
473                         /* Ignore if indexes are out of bounds. */
474                         if (field->index >= field->report->maxfield ||
475                             usage->usage_index >= field->report_count)
476                                 return 1;
477                         td->cc_index = field->index;
478                         td->cc_value_index = usage->usage_index;
479                         return 1;
480                 case HID_DG_CONTACTMAX:
481                         /* we don't set td->last_slot_field as contactcount and
482                          * contact max are global to the report */
483                         return -1;
484                 case HID_DG_TOUCH:
485                         /* Legacy devices use TIPSWITCH and not TOUCH.
486                          * Let's just ignore this field. */
487                         return -1;
488                 }
489                 /* let hid-input decide for the others */
490                 return 0;
491 
492         case HID_UP_BUTTON:
493                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
494                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
495                 input_set_capability(hi->input, EV_KEY, code);
496                 return 1;
497 
498         case 0xff000000:
499                 /* we do not want to map these: no input-oriented meaning */
500                 return -1;
501         }
502 
503         return 0;
504 }
505 
506 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
507                 struct hid_field *field, struct hid_usage *usage,
508                 unsigned long **bit, int *max)
509 {
510         if (usage->type == EV_KEY || usage->type == EV_ABS)
511                 set_bit(usage->type, hi->input->evbit);
512 
513         return -1;
514 }
515 
516 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
517 {
518         __s32 quirks = td->mtclass.quirks;
519 
520         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
521                 return td->curdata.contactid;
522 
523         if (quirks & MT_QUIRK_CYPRESS)
524                 return cypress_compute_slot(td);
525 
526         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
527                 return td->num_received;
528 
529         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
530                 return td->curdata.contactid - 1;
531 
532         return input_mt_get_slot_by_key(input, td->curdata.contactid);
533 }
534 
535 /*
536  * this function is called when a whole contact has been processed,
537  * so that it can assign it to a slot and store the data there
538  */
539 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
540 {
541         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
542             td->num_received >= td->num_expected)
543                 return;
544 
545         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
546                 int slotnum = mt_compute_slot(td, input);
547                 struct mt_slot *s = &td->curdata;
548                 struct input_mt *mt = input->mt;
549 
550                 if (slotnum < 0 || slotnum >= td->maxcontacts)
551                         return;
552 
553                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
554                         struct input_mt_slot *slot = &mt->slots[slotnum];
555                         if (input_mt_is_active(slot) &&
556                             input_mt_is_used(mt, slot))
557                                 return;
558                 }
559 
560                 input_mt_slot(input, slotnum);
561                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
562                         s->touch_state || s->inrange_state);
563                 if (s->touch_state || s->inrange_state) {
564                         /* this finger is in proximity of the sensor */
565                         int wide = (s->w > s->h);
566                         /* divided by two to match visual scale of touch */
567                         int major = max(s->w, s->h) >> 1;
568                         int minor = min(s->w, s->h) >> 1;
569 
570                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
571                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
572                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
573                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
574                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
575                                 !s->touch_state);
576                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
577                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
578                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
579                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
580                 }
581         }
582 
583         td->num_received++;
584 }
585 
586 /*
587  * this function is called when a whole packet has been received and processed,
588  * so that it can decide what to send to the input layer.
589  */
590 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
591 {
592         input_mt_sync_frame(input);
593         input_sync(input);
594         td->num_received = 0;
595 }
596 
597 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
598                                 struct hid_usage *usage, __s32 value)
599 {
600         /* we will handle the hidinput part later, now remains hiddev */
601         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
602                 hid->hiddev_hid_event(hid, field, usage, value);
603 
604         return 1;
605 }
606 
607 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
608                                 struct hid_usage *usage, __s32 value)
609 {
610         struct mt_device *td = hid_get_drvdata(hid);
611         __s32 quirks = td->mtclass.quirks;
612         struct input_dev *input = field->hidinput->input;
613 
614         if (hid->claimed & HID_CLAIMED_INPUT) {
615                 switch (usage->hid) {
616                 case HID_DG_INRANGE:
617                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
618                                 td->curvalid = value;
619                         if (quirks & MT_QUIRK_HOVERING)
620                                 td->curdata.inrange_state = value;
621                         break;
622                 case HID_DG_TIPSWITCH:
623                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
624                                 td->curvalid = value;
625                         td->curdata.touch_state = value;
626                         break;
627                 case HID_DG_CONFIDENCE:
628                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
629                                 td->curvalid = value;
630                         break;
631                 case HID_DG_CONTACTID:
632                         td->curdata.contactid = value;
633                         break;
634                 case HID_DG_TIPPRESSURE:
635                         td->curdata.p = value;
636                         break;
637                 case HID_GD_X:
638                         if (usage->code == ABS_MT_TOOL_X)
639                                 td->curdata.cx = value;
640                         else
641                                 td->curdata.x = value;
642                         break;
643                 case HID_GD_Y:
644                         if (usage->code == ABS_MT_TOOL_Y)
645                                 td->curdata.cy = value;
646                         else
647                                 td->curdata.y = value;
648                         break;
649                 case HID_DG_WIDTH:
650                         td->curdata.w = value;
651                         break;
652                 case HID_DG_HEIGHT:
653                         td->curdata.h = value;
654                         break;
655                 case HID_DG_CONTACTCOUNT:
656                         break;
657                 case HID_DG_TOUCH:
658                         /* do nothing */
659                         break;
660 
661                 default:
662                         if (usage->type)
663                                 input_event(input, usage->type, usage->code,
664                                                 value);
665                         return;
666                 }
667 
668                 if (usage->usage_index + 1 == field->report_count) {
669                         /* we only take into account the last report. */
670                         if (usage->hid == td->last_slot_field)
671                                 mt_complete_slot(td, field->hidinput->input);
672                 }
673 
674         }
675 }
676 
677 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
678 {
679         struct mt_device *td = hid_get_drvdata(hid);
680         struct hid_field *field;
681         unsigned count;
682         int r, n;
683 
684         /*
685          * Includes multi-packet support where subsequent
686          * packets are sent with zero contactcount.
687          */
688         if (td->cc_index >= 0) {
689                 struct hid_field *field = report->field[td->cc_index];
690                 int value = field->value[td->cc_value_index];
691                 if (value)
692                         td->num_expected = value;
693         }
694 
695         for (r = 0; r < report->maxfield; r++) {
696                 field = report->field[r];
697                 count = field->report_count;
698 
699                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
700                         continue;
701 
702                 for (n = 0; n < count; n++)
703                         mt_process_mt_event(hid, field, &field->usage[n],
704                                         field->value[n]);
705         }
706 
707         if (td->num_received >= td->num_expected)
708                 mt_sync_frame(td, report->field[0]->hidinput->input);
709 }
710 
711 static void mt_touch_input_configured(struct hid_device *hdev,
712                                         struct hid_input *hi)
713 {
714         struct mt_device *td = hid_get_drvdata(hdev);
715         struct mt_class *cls = &td->mtclass;
716         struct input_dev *input = hi->input;
717 
718         if (!td->maxcontacts)
719                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
720 
721         mt_post_parse(td);
722         if (td->serial_maybe)
723                 mt_post_parse_default_settings(td);
724 
725         if (cls->is_indirect)
726                 td->mt_flags |= INPUT_MT_POINTER;
727 
728         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
729                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
730 
731         input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
732 
733         td->mt_flags = 0;
734 }
735 
736 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
737                 struct hid_field *field, struct hid_usage *usage,
738                 unsigned long **bit, int *max)
739 {
740         struct mt_device *td = hid_get_drvdata(hdev);
741 
742         /*
743          * If mtclass.export_all_inputs is not set, only map fields from
744          * TouchScreen or TouchPad collections. We need to ignore fields
745          * that belong to other collections such as Mouse that might have
746          * the same GenericDesktop usages.
747          */
748         if (!td->mtclass.export_all_inputs &&
749             field->application != HID_DG_TOUCHSCREEN &&
750             field->application != HID_DG_PEN &&
751             field->application != HID_DG_TOUCHPAD)
752                 return -1;
753 
754         /*
755          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
756          * for the stylus.
757          */
758         if (field->physical == HID_DG_STYLUS)
759                 return 0;
760 
761         if (field->application == HID_DG_TOUCHSCREEN ||
762             field->application == HID_DG_TOUCHPAD)
763                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
764 
765         /* let hid-core decide for the others */
766         return 0;
767 }
768 
769 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
770                 struct hid_field *field, struct hid_usage *usage,
771                 unsigned long **bit, int *max)
772 {
773         /*
774          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
775          * for the stylus.
776          */
777         if (field->physical == HID_DG_STYLUS)
778                 return 0;
779 
780         if (field->application == HID_DG_TOUCHSCREEN ||
781             field->application == HID_DG_TOUCHPAD)
782                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
783 
784         /* let hid-core decide for the others */
785         return 0;
786 }
787 
788 static int mt_event(struct hid_device *hid, struct hid_field *field,
789                                 struct hid_usage *usage, __s32 value)
790 {
791         struct mt_device *td = hid_get_drvdata(hid);
792 
793         if (field->report->id == td->mt_report_id)
794                 return mt_touch_event(hid, field, usage, value);
795 
796         return 0;
797 }
798 
799 static void mt_report(struct hid_device *hid, struct hid_report *report)
800 {
801         struct mt_device *td = hid_get_drvdata(hid);
802         struct hid_field *field = report->field[0];
803 
804         if (!(hid->claimed & HID_CLAIMED_INPUT))
805                 return;
806 
807         if (report->id == td->mt_report_id)
808                 return mt_touch_report(hid, report);
809 
810         if (field && field->hidinput && field->hidinput->input)
811                 input_sync(field->hidinput->input);
812 }
813 
814 static void mt_set_input_mode(struct hid_device *hdev)
815 {
816         struct mt_device *td = hid_get_drvdata(hdev);
817         struct hid_report *r;
818         struct hid_report_enum *re;
819         struct mt_class *cls = &td->mtclass;
820         char *buf;
821         int report_len;
822 
823         if (td->inputmode < 0)
824                 return;
825 
826         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
827         r = re->report_id_hash[td->inputmode];
828         if (r) {
829                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
830                         report_len = hid_report_len(r);
831                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
832                         if (!buf) {
833                                 hid_err(hdev, "failed to allocate buffer for report\n");
834                                 return;
835                         }
836                         hid_hw_raw_request(hdev, r->id, buf, report_len,
837                                            HID_FEATURE_REPORT,
838                                            HID_REQ_GET_REPORT);
839                         kfree(buf);
840                 }
841                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
842                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
843         }
844 }
845 
846 static void mt_set_maxcontacts(struct hid_device *hdev)
847 {
848         struct mt_device *td = hid_get_drvdata(hdev);
849         struct hid_report *r;
850         struct hid_report_enum *re;
851         int fieldmax, max;
852 
853         if (td->maxcontact_report_id < 0)
854                 return;
855 
856         if (!td->mtclass.maxcontacts)
857                 return;
858 
859         re = &hdev->report_enum[HID_FEATURE_REPORT];
860         r = re->report_id_hash[td->maxcontact_report_id];
861         if (r) {
862                 max = td->mtclass.maxcontacts;
863                 fieldmax = r->field[0]->logical_maximum;
864                 max = min(fieldmax, max);
865                 if (r->field[0]->value[0] != max) {
866                         r->field[0]->value[0] = max;
867                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
868                 }
869         }
870 }
871 
872 static void mt_post_parse_default_settings(struct mt_device *td)
873 {
874         __s32 quirks = td->mtclass.quirks;
875 
876         /* unknown serial device needs special quirks */
877         if (td->touches_by_report == 1) {
878                 quirks |= MT_QUIRK_ALWAYS_VALID;
879                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
880                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
881                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
882                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
883         }
884 
885         td->mtclass.quirks = quirks;
886 }
887 
888 static void mt_post_parse(struct mt_device *td)
889 {
890         struct mt_fields *f = td->fields;
891         struct mt_class *cls = &td->mtclass;
892 
893         if (td->touches_by_report > 0) {
894                 int field_count_per_touch = f->length / td->touches_by_report;
895                 td->last_slot_field = f->usages[field_count_per_touch - 1];
896         }
897 
898         if (td->cc_index < 0)
899                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
900 }
901 
902 static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
903 {
904         struct mt_device *td = hid_get_drvdata(hdev);
905         char *name;
906         const char *suffix = NULL;
907         struct hid_field *field = hi->report->field[0];
908 
909         if (hi->report->id == td->mt_report_id)
910                 mt_touch_input_configured(hdev, hi);
911 
912         /*
913          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
914          * for the stylus. Check this first, and then rely on the application
915          * field.
916          */
917         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
918                 suffix = "Pen";
919                 /* force BTN_STYLUS to allow tablet matching in udev */
920                 __set_bit(BTN_STYLUS, hi->input->keybit);
921         } else {
922                 switch (field->application) {
923                 case HID_GD_KEYBOARD:
924                         suffix = "Keyboard";
925                         break;
926                 case HID_GD_KEYPAD:
927                         suffix = "Keypad";
928                         break;
929                 case HID_GD_MOUSE:
930                         suffix = "Mouse";
931                         break;
932                 case HID_DG_STYLUS:
933                         suffix = "Pen";
934                         /* force BTN_STYLUS to allow tablet matching in udev */
935                         __set_bit(BTN_STYLUS, hi->input->keybit);
936                         break;
937                 case HID_DG_TOUCHSCREEN:
938                         /* we do not set suffix = "Touchscreen" */
939                         break;
940                 case HID_GD_SYSTEM_CONTROL:
941                         suffix = "System Control";
942                         break;
943                 case HID_CP_CONSUMER_CONTROL:
944                         suffix = "Consumer Control";
945                         break;
946                 default:
947                         suffix = "UNKNOWN";
948                         break;
949                 }
950         }
951 
952         if (suffix) {
953                 name = devm_kzalloc(&hi->input->dev,
954                                     strlen(hdev->name) + strlen(suffix) + 2,
955                                     GFP_KERNEL);
956                 if (name) {
957                         sprintf(name, "%s %s", hdev->name, suffix);
958                         hi->input->name = name;
959                 }
960         }
961 }
962 
963 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
964 {
965         int ret, i;
966         struct mt_device *td;
967         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
968 
969         for (i = 0; mt_classes[i].name ; i++) {
970                 if (id->driver_data == mt_classes[i].name) {
971                         mtclass = &(mt_classes[i]);
972                         break;
973                 }
974         }
975 
976         /* This allows the driver to correctly support devices
977          * that emit events over several HID messages.
978          */
979         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
980 
981         /*
982          * This allows the driver to handle different input sensors
983          * that emits events through different reports on the same HID
984          * device.
985          */
986         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
987         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
988 
989         /*
990          * Handle special quirks for Windows 8 certified devices.
991          */
992         if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
993                 /*
994                  * Some multitouch screens do not like to be polled for input
995                  * reports. Fortunately, the Win8 spec says that all touches
996                  * should be sent during each report, making the initialization
997                  * of input reports unnecessary.
998                  */
999                 hdev->quirks |= HID_QUIRK_NO_INIT_INPUT_REPORTS;
1000 
1001         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1002         if (!td) {
1003                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1004                 return -ENOMEM;
1005         }
1006         td->mtclass = *mtclass;
1007         td->inputmode = -1;
1008         td->maxcontact_report_id = -1;
1009         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1010         td->cc_index = -1;
1011         td->mt_report_id = -1;
1012         hid_set_drvdata(hdev, td);
1013 
1014         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1015                                   GFP_KERNEL);
1016         if (!td->fields) {
1017                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1018                 return -ENOMEM;
1019         }
1020 
1021         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1022                 td->serial_maybe = true;
1023 
1024         ret = hid_parse(hdev);
1025         if (ret != 0)
1026                 return ret;
1027 
1028         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1029         if (ret)
1030                 return ret;
1031 
1032         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1033 
1034         mt_set_maxcontacts(hdev);
1035         mt_set_input_mode(hdev);
1036 
1037         /* release .fields memory as it is not used anymore */
1038         devm_kfree(&hdev->dev, td->fields);
1039         td->fields = NULL;
1040 
1041         return 0;
1042 }
1043 
1044 #ifdef CONFIG_PM
1045 static int mt_reset_resume(struct hid_device *hdev)
1046 {
1047         mt_set_maxcontacts(hdev);
1048         mt_set_input_mode(hdev);
1049         return 0;
1050 }
1051 
1052 static int mt_resume(struct hid_device *hdev)
1053 {
1054         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1055          * It should be safe to send it to other devices too.
1056          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1057 
1058         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1059 
1060         return 0;
1061 }
1062 #endif
1063 
1064 static void mt_remove(struct hid_device *hdev)
1065 {
1066         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1067         hid_hw_stop(hdev);
1068 }
1069 
1070 /*
1071  * This list contains only:
1072  * - VID/PID of products not working with the default multitouch handling
1073  * - 2 generic rules.
1074  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1075  */
1076 static const struct hid_device_id mt_devices[] = {
1077 
1078         /* 3M panels */
1079         { .driver_data = MT_CLS_3M,
1080                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1081                         USB_DEVICE_ID_3M1968) },
1082         { .driver_data = MT_CLS_3M,
1083                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1084                         USB_DEVICE_ID_3M2256) },
1085         { .driver_data = MT_CLS_3M,
1086                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1087                         USB_DEVICE_ID_3M3266) },
1088 
1089         /* Anton devices */
1090         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1091                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1092                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1093 
1094         /* Atmel panels */
1095         { .driver_data = MT_CLS_SERIAL,
1096                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1097                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1098 
1099         /* Baanto multitouch devices */
1100         { .driver_data = MT_CLS_NSMU,
1101                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1102                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1103 
1104         /* Cando panels */
1105         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1106                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1107                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1108         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1109                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1110                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1111 
1112         /* Chunghwa Telecom touch panels */
1113         {  .driver_data = MT_CLS_NSMU,
1114                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1115                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1116 
1117         /* CVTouch panels */
1118         { .driver_data = MT_CLS_NSMU,
1119                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1120                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1121 
1122         /* eGalax devices (resistive) */
1123         { .driver_data = MT_CLS_EGALAX,
1124                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1125                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1126         { .driver_data = MT_CLS_EGALAX,
1127                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1128                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1129 
1130         /* eGalax devices (capacitive) */
1131         { .driver_data = MT_CLS_EGALAX_SERIAL,
1132                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1133                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1134         { .driver_data = MT_CLS_EGALAX,
1135                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1136                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1137         { .driver_data = MT_CLS_EGALAX_SERIAL,
1138                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1139                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1140         { .driver_data = MT_CLS_EGALAX_SERIAL,
1141                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1142                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1143         { .driver_data = MT_CLS_EGALAX_SERIAL,
1144                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1145                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1146         { .driver_data = MT_CLS_EGALAX_SERIAL,
1147                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1148                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1149         { .driver_data = MT_CLS_EGALAX,
1150                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1151                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1152         { .driver_data = MT_CLS_EGALAX,
1153                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1154                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1155         { .driver_data = MT_CLS_EGALAX_SERIAL,
1156                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1157                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1158         { .driver_data = MT_CLS_EGALAX,
1159                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1160                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1161         { .driver_data = MT_CLS_EGALAX,
1162                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1163                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1164         { .driver_data = MT_CLS_EGALAX,
1165                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1166                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1167         { .driver_data = MT_CLS_EGALAX,
1168                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1169                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1170         { .driver_data = MT_CLS_EGALAX_SERIAL,
1171                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1172                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1173         { .driver_data = MT_CLS_EGALAX_SERIAL,
1174                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1175                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1176         { .driver_data = MT_CLS_EGALAX_SERIAL,
1177                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1178                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1179 
1180         /* Elitegroup panel */
1181         { .driver_data = MT_CLS_SERIAL,
1182                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1183                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1184 
1185         /* Flatfrog Panels */
1186         { .driver_data = MT_CLS_FLATFROG,
1187                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1188                         USB_DEVICE_ID_MULTITOUCH_3200) },
1189 
1190         /* FocalTech Panels */
1191         { .driver_data = MT_CLS_SERIAL,
1192                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1193                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1194 
1195         /* GeneralTouch panel */
1196         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1197                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1198                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1199         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1200                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1201                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1202         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1203                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1204                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1205         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1206                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1207                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1208         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1209                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1210                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1211         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1212                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1213                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1214         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1215                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1216                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1217 
1218         /* Gametel game controller */
1219         { .driver_data = MT_CLS_NSMU,
1220                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1221                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1222 
1223         /* GoodTouch panels */
1224         { .driver_data = MT_CLS_NSMU,
1225                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1226                         USB_DEVICE_ID_GOODTOUCH_000f) },
1227 
1228         /* Hanvon panels */
1229         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1230                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1231                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1232 
1233         /* Ilitek dual touch panel */
1234         {  .driver_data = MT_CLS_NSMU,
1235                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1236                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1237 
1238         /* MosArt panels */
1239         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1240                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1241                         USB_DEVICE_ID_ASUS_T91MT)},
1242         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1243                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1244                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1245         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1246                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1247                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1248 
1249         /* Panasonic panels */
1250         { .driver_data = MT_CLS_PANASONIC,
1251                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1252                         USB_DEVICE_ID_PANABOARD_UBT780) },
1253         { .driver_data = MT_CLS_PANASONIC,
1254                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1255                         USB_DEVICE_ID_PANABOARD_UBT880) },
1256 
1257         /* Novatek Panel */
1258         { .driver_data = MT_CLS_NSMU,
1259                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1260                         USB_DEVICE_ID_NOVATEK_PCT) },
1261 
1262         /* PixArt optical touch screen */
1263         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1264                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1265                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1266         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1267                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1268                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1269         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1270                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1271                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1272 
1273         /* PixCir-based panels */
1274         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1275                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1276                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1277 
1278         /* Quanta-based panels */
1279         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1280                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1281                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1282 
1283         /* Stantum panels */
1284         { .driver_data = MT_CLS_CONFIDENCE,
1285                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1286                         USB_DEVICE_ID_MTP_STM)},
1287 
1288         /* TopSeed panels */
1289         { .driver_data = MT_CLS_TOPSEED,
1290                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1291                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1292 
1293         /* Touch International panels */
1294         { .driver_data = MT_CLS_NSMU,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1296                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1297 
1298         /* Unitec panels */
1299         { .driver_data = MT_CLS_NSMU,
1300                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1301                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1302         { .driver_data = MT_CLS_NSMU,
1303                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1304                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1305 
1306         /* VTL panels */
1307         { .driver_data = MT_CLS_VTL,
1308                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1309                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1310 
1311         /* Wistron panels */
1312         { .driver_data = MT_CLS_NSMU,
1313                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1314                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1315 
1316         /* XAT */
1317         { .driver_data = MT_CLS_NSMU,
1318                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1319                         USB_DEVICE_ID_XAT_CSR) },
1320 
1321         /* Xiroku */
1322         { .driver_data = MT_CLS_NSMU,
1323                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1324                         USB_DEVICE_ID_XIROKU_SPX) },
1325         { .driver_data = MT_CLS_NSMU,
1326                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1327                         USB_DEVICE_ID_XIROKU_MPX) },
1328         { .driver_data = MT_CLS_NSMU,
1329                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1330                         USB_DEVICE_ID_XIROKU_CSR) },
1331         { .driver_data = MT_CLS_NSMU,
1332                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1333                         USB_DEVICE_ID_XIROKU_SPX1) },
1334         { .driver_data = MT_CLS_NSMU,
1335                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1336                         USB_DEVICE_ID_XIROKU_MPX1) },
1337         { .driver_data = MT_CLS_NSMU,
1338                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1339                         USB_DEVICE_ID_XIROKU_CSR1) },
1340         { .driver_data = MT_CLS_NSMU,
1341                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1342                         USB_DEVICE_ID_XIROKU_SPX2) },
1343         { .driver_data = MT_CLS_NSMU,
1344                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1345                         USB_DEVICE_ID_XIROKU_MPX2) },
1346         { .driver_data = MT_CLS_NSMU,
1347                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1348                         USB_DEVICE_ID_XIROKU_CSR2) },
1349 
1350         /* Generic MT device */
1351         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1352 
1353         /* Generic Win 8 certified MT device */
1354         {  .driver_data = MT_CLS_WIN_8,
1355                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1356                         HID_ANY_ID, HID_ANY_ID) },
1357         { }
1358 };
1359 MODULE_DEVICE_TABLE(hid, mt_devices);
1360 
1361 static const struct hid_usage_id mt_grabbed_usages[] = {
1362         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1363         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1364 };
1365 
1366 static struct hid_driver mt_driver = {
1367         .name = "hid-multitouch",
1368         .id_table = mt_devices,
1369         .probe = mt_probe,
1370         .remove = mt_remove,
1371         .input_mapping = mt_input_mapping,
1372         .input_mapped = mt_input_mapped,
1373         .input_configured = mt_input_configured,
1374         .feature_mapping = mt_feature_mapping,
1375         .usage_table = mt_grabbed_usages,
1376         .event = mt_event,
1377         .report = mt_report,
1378 #ifdef CONFIG_PM
1379         .reset_resume = mt_reset_resume,
1380         .resume = mt_resume,
1381 #endif
1382 };
1383 module_hid_driver(mt_driver);
1384 

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