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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/input/mt.h>
 46 #include <linux/string.h>
 47 
 48 
 49 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
 50 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 51 MODULE_DESCRIPTION("HID multitouch panels");
 52 MODULE_LICENSE("GPL");
 53 
 54 #include "hid-ids.h"
 55 
 56 /* quirks to control the device */
 57 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
 58 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
 59 #define MT_QUIRK_CYPRESS                (1 << 2)
 60 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
 61 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
 62 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
 63 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
 64 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
 65 #define MT_QUIRK_NO_AREA                (1 << 9)
 66 #define MT_QUIRK_IGNORE_DUPLICATES      (1 << 10)
 67 #define MT_QUIRK_HOVERING               (1 << 11)
 68 #define MT_QUIRK_CONTACT_CNT_ACCURATE   (1 << 12)
 69 #define MT_QUIRK_FORCE_GET_FEATURE      (1 << 13)
 70 
 71 #define MT_INPUTMODE_TOUCHSCREEN        0x02
 72 #define MT_INPUTMODE_TOUCHPAD           0x03
 73 
 74 #define MT_BUTTONTYPE_CLICKPAD          0
 75 
 76 struct mt_slot {
 77         __s32 x, y, cx, cy, p, w, h;
 78         __s32 contactid;        /* the device ContactID assigned to this slot */
 79         bool touch_state;       /* is the touch valid? */
 80         bool inrange_state;     /* is the finger in proximity of the sensor? */
 81 };
 82 
 83 struct mt_class {
 84         __s32 name;     /* MT_CLS */
 85         __s32 quirks;
 86         __s32 sn_move;  /* Signal/noise ratio for move events */
 87         __s32 sn_width; /* Signal/noise ratio for width events */
 88         __s32 sn_height;        /* Signal/noise ratio for height events */
 89         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
 90         __u8 maxcontacts;
 91         bool is_indirect;       /* true for touchpads */
 92         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
 93 };
 94 
 95 struct mt_fields {
 96         unsigned usages[HID_MAX_FIELDS];
 97         unsigned int length;
 98 };
 99 
100 struct mt_device {
101         struct mt_slot curdata; /* placeholder of incoming data */
102         struct mt_class mtclass;        /* our mt device class */
103         struct mt_fields *fields;       /* temporary placeholder for storing the
104                                            multitouch fields */
105         int cc_index;   /* contact count field index in the report */
106         int cc_value_index;     /* contact count value index in the field */
107         unsigned last_slot_field;       /* the last field of a slot */
108         unsigned mt_report_id;  /* the report ID of the multitouch device */
109         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
110         __s16 inputmode_index;  /* InputMode HID feature index in the report */
111         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
112                                    -1 if non-existent */
113         __u8 inputmode_value;  /* InputMode HID feature value */
114         __u8 num_received;      /* how many contacts we received */
115         __u8 num_expected;      /* expected last contact index */
116         __u8 maxcontacts;
117         __u8 touches_by_report; /* how many touches are present in one report:
118                                 * 1 means we should use a serial protocol
119                                 * > 1 means hybrid (multitouch) protocol */
120         __u8 buttons_count;     /* number of physical buttons per touchpad */
121         bool is_buttonpad;      /* is this device a button pad? */
122         bool serial_maybe;      /* need to check for serial protocol */
123         bool curvalid;          /* is the current contact valid? */
124         unsigned mt_flags;      /* flags to pass to input-mt */
125 };
126 
127 static void mt_post_parse_default_settings(struct mt_device *td);
128 static void mt_post_parse(struct mt_device *td);
129 
130 /* classes of device behavior */
131 #define MT_CLS_DEFAULT                          0x0001
132 
133 #define MT_CLS_SERIAL                           0x0002
134 #define MT_CLS_CONFIDENCE                       0x0003
135 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
136 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
137 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
138 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
139 /* reserved                                     0x0008 */
140 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
141 #define MT_CLS_NSMU                             0x000a
142 /* reserved                                     0x0010 */
143 /* reserved                                     0x0011 */
144 #define MT_CLS_WIN_8                            0x0012
145 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
146 
147 /* vendor specific classes */
148 #define MT_CLS_3M                               0x0101
149 /* reserved                                     0x0102 */
150 #define MT_CLS_EGALAX                           0x0103
151 #define MT_CLS_EGALAX_SERIAL                    0x0104
152 #define MT_CLS_TOPSEED                          0x0105
153 #define MT_CLS_PANASONIC                        0x0106
154 #define MT_CLS_FLATFROG                         0x0107
155 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
156 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
157 #define MT_CLS_VTL                              0x0110
158 
159 #define MT_DEFAULT_MAXCONTACT   10
160 #define MT_MAX_MAXCONTACT       250
161 
162 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
163 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
164 
165 /*
166  * these device-dependent functions determine what slot corresponds
167  * to a valid contact that was just read.
168  */
169 
170 static int cypress_compute_slot(struct mt_device *td)
171 {
172         if (td->curdata.contactid != 0 || td->num_received == 0)
173                 return td->curdata.contactid;
174         else
175                 return -1;
176 }
177 
178 static struct mt_class mt_classes[] = {
179         { .name = MT_CLS_DEFAULT,
180                 .quirks = MT_QUIRK_ALWAYS_VALID |
181                         MT_QUIRK_CONTACT_CNT_ACCURATE },
182         { .name = MT_CLS_NSMU,
183                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
184         { .name = MT_CLS_SERIAL,
185                 .quirks = MT_QUIRK_ALWAYS_VALID},
186         { .name = MT_CLS_CONFIDENCE,
187                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
188         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
189                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
190                         MT_QUIRK_SLOT_IS_CONTACTID },
191         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
192                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
193                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
194         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
195                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
196                         MT_QUIRK_SLOT_IS_CONTACTID,
197                 .maxcontacts = 2 },
198         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
199                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
200                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
201                 .maxcontacts = 2 },
202         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
203                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
204                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
205         { .name = MT_CLS_WIN_8,
206                 .quirks = MT_QUIRK_ALWAYS_VALID |
207                         MT_QUIRK_IGNORE_DUPLICATES |
208                         MT_QUIRK_HOVERING |
209                         MT_QUIRK_CONTACT_CNT_ACCURATE },
210         { .name = MT_CLS_EXPORT_ALL_INPUTS,
211                 .quirks = MT_QUIRK_ALWAYS_VALID |
212                         MT_QUIRK_CONTACT_CNT_ACCURATE,
213                 .export_all_inputs = true },
214 
215         /*
216          * vendor specific classes
217          */
218         { .name = MT_CLS_3M,
219                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
220                         MT_QUIRK_SLOT_IS_CONTACTID,
221                 .sn_move = 2048,
222                 .sn_width = 128,
223                 .sn_height = 128,
224                 .maxcontacts = 60,
225         },
226         { .name = MT_CLS_EGALAX,
227                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
228                         MT_QUIRK_VALID_IS_INRANGE,
229                 .sn_move = 4096,
230                 .sn_pressure = 32,
231         },
232         { .name = MT_CLS_EGALAX_SERIAL,
233                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
234                         MT_QUIRK_ALWAYS_VALID,
235                 .sn_move = 4096,
236                 .sn_pressure = 32,
237         },
238         { .name = MT_CLS_TOPSEED,
239                 .quirks = MT_QUIRK_ALWAYS_VALID,
240                 .is_indirect = true,
241                 .maxcontacts = 2,
242         },
243         { .name = MT_CLS_PANASONIC,
244                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
245                 .maxcontacts = 4 },
246         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
247                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
248                         MT_QUIRK_VALID_IS_INRANGE |
249                         MT_QUIRK_SLOT_IS_CONTACTID,
250                 .maxcontacts = 2
251         },
252         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
253                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
254                         MT_QUIRK_SLOT_IS_CONTACTID
255         },
256 
257         { .name = MT_CLS_FLATFROG,
258                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
259                         MT_QUIRK_NO_AREA,
260                 .sn_move = 2048,
261                 .maxcontacts = 40,
262         },
263         { .name = MT_CLS_VTL,
264                 .quirks = MT_QUIRK_ALWAYS_VALID |
265                         MT_QUIRK_CONTACT_CNT_ACCURATE |
266                         MT_QUIRK_FORCE_GET_FEATURE,
267         },
268         { }
269 };
270 
271 static ssize_t mt_show_quirks(struct device *dev,
272                            struct device_attribute *attr,
273                            char *buf)
274 {
275         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
276         struct mt_device *td = hid_get_drvdata(hdev);
277 
278         return sprintf(buf, "%u\n", td->mtclass.quirks);
279 }
280 
281 static ssize_t mt_set_quirks(struct device *dev,
282                           struct device_attribute *attr,
283                           const char *buf, size_t count)
284 {
285         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
286         struct mt_device *td = hid_get_drvdata(hdev);
287 
288         unsigned long val;
289 
290         if (kstrtoul(buf, 0, &val))
291                 return -EINVAL;
292 
293         td->mtclass.quirks = val;
294 
295         if (td->cc_index < 0)
296                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
297 
298         return count;
299 }
300 
301 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
302 
303 static struct attribute *sysfs_attrs[] = {
304         &dev_attr_quirks.attr,
305         NULL
306 };
307 
308 static struct attribute_group mt_attribute_group = {
309         .attrs = sysfs_attrs
310 };
311 
312 static void mt_feature_mapping(struct hid_device *hdev,
313                 struct hid_field *field, struct hid_usage *usage)
314 {
315         struct mt_device *td = hid_get_drvdata(hdev);
316 
317         switch (usage->hid) {
318         case HID_DG_INPUTMODE:
319                 /* Ignore if value index is out of bounds. */
320                 if (usage->usage_index >= field->report_count) {
321                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
322                         break;
323                 }
324 
325                 td->inputmode = field->report->id;
326                 td->inputmode_index = usage->usage_index;
327 
328                 break;
329         case HID_DG_CONTACTMAX:
330                 td->maxcontact_report_id = field->report->id;
331                 td->maxcontacts = field->value[0];
332                 if (!td->maxcontacts &&
333                     field->logical_maximum <= MT_MAX_MAXCONTACT)
334                         td->maxcontacts = field->logical_maximum;
335                 if (td->mtclass.maxcontacts)
336                         /* check if the maxcontacts is given by the class */
337                         td->maxcontacts = td->mtclass.maxcontacts;
338 
339                 break;
340         case HID_DG_BUTTONTYPE:
341                 if (usage->usage_index >= field->report_count) {
342                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
343                         break;
344                 }
345 
346                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
347                         td->is_buttonpad = true;
348 
349                 break;
350         }
351 }
352 
353 static void set_abs(struct input_dev *input, unsigned int code,
354                 struct hid_field *field, int snratio)
355 {
356         int fmin = field->logical_minimum;
357         int fmax = field->logical_maximum;
358         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
359         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
360         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
361 }
362 
363 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
364                 struct hid_input *hi)
365 {
366         struct mt_fields *f = td->fields;
367 
368         if (f->length >= HID_MAX_FIELDS)
369                 return;
370 
371         f->usages[f->length++] = usage->hid;
372 }
373 
374 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
375                 struct hid_field *field, struct hid_usage *usage,
376                 unsigned long **bit, int *max)
377 {
378         struct mt_device *td = hid_get_drvdata(hdev);
379         struct mt_class *cls = &td->mtclass;
380         int code;
381         struct hid_usage *prev_usage = NULL;
382 
383         if (field->application == HID_DG_TOUCHSCREEN)
384                 td->mt_flags |= INPUT_MT_DIRECT;
385 
386         /*
387          * Model touchscreens providing buttons as touchpads.
388          */
389         if (field->application == HID_DG_TOUCHPAD ||
390             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
391                 td->mt_flags |= INPUT_MT_POINTER;
392                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
393         }
394 
395         /* count the buttons on touchpads */
396         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
397                 td->buttons_count++;
398 
399         if (usage->usage_index)
400                 prev_usage = &field->usage[usage->usage_index - 1];
401 
402         switch (usage->hid & HID_USAGE_PAGE) {
403 
404         case HID_UP_GENDESK:
405                 switch (usage->hid) {
406                 case HID_GD_X:
407                         if (prev_usage && (prev_usage->hid == usage->hid)) {
408                                 hid_map_usage(hi, usage, bit, max,
409                                         EV_ABS, ABS_MT_TOOL_X);
410                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
411                                         cls->sn_move);
412                         } else {
413                                 hid_map_usage(hi, usage, bit, max,
414                                         EV_ABS, ABS_MT_POSITION_X);
415                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
416                                         cls->sn_move);
417                         }
418 
419                         mt_store_field(usage, td, hi);
420                         return 1;
421                 case HID_GD_Y:
422                         if (prev_usage && (prev_usage->hid == usage->hid)) {
423                                 hid_map_usage(hi, usage, bit, max,
424                                         EV_ABS, ABS_MT_TOOL_Y);
425                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
426                                         cls->sn_move);
427                         } else {
428                                 hid_map_usage(hi, usage, bit, max,
429                                         EV_ABS, ABS_MT_POSITION_Y);
430                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
431                                         cls->sn_move);
432                         }
433 
434                         mt_store_field(usage, td, hi);
435                         return 1;
436                 }
437                 return 0;
438 
439         case HID_UP_DIGITIZER:
440                 switch (usage->hid) {
441                 case HID_DG_INRANGE:
442                         if (cls->quirks & MT_QUIRK_HOVERING) {
443                                 hid_map_usage(hi, usage, bit, max,
444                                         EV_ABS, ABS_MT_DISTANCE);
445                                 input_set_abs_params(hi->input,
446                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
447                         }
448                         mt_store_field(usage, td, hi);
449                         return 1;
450                 case HID_DG_CONFIDENCE:
451                         mt_store_field(usage, td, hi);
452                         return 1;
453                 case HID_DG_TIPSWITCH:
454                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
455                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
456                         mt_store_field(usage, td, hi);
457                         return 1;
458                 case HID_DG_CONTACTID:
459                         mt_store_field(usage, td, hi);
460                         td->touches_by_report++;
461                         td->mt_report_id = field->report->id;
462                         return 1;
463                 case HID_DG_WIDTH:
464                         hid_map_usage(hi, usage, bit, max,
465                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
466                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
467                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
468                                         cls->sn_width);
469                         mt_store_field(usage, td, hi);
470                         return 1;
471                 case HID_DG_HEIGHT:
472                         hid_map_usage(hi, usage, bit, max,
473                                         EV_ABS, ABS_MT_TOUCH_MINOR);
474                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
475                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
476                                         cls->sn_height);
477                                 input_set_abs_params(hi->input,
478                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
479                         }
480                         mt_store_field(usage, td, hi);
481                         return 1;
482                 case HID_DG_TIPPRESSURE:
483                         hid_map_usage(hi, usage, bit, max,
484                                         EV_ABS, ABS_MT_PRESSURE);
485                         set_abs(hi->input, ABS_MT_PRESSURE, field,
486                                 cls->sn_pressure);
487                         mt_store_field(usage, td, hi);
488                         return 1;
489                 case HID_DG_CONTACTCOUNT:
490                         /* Ignore if indexes are out of bounds. */
491                         if (field->index >= field->report->maxfield ||
492                             usage->usage_index >= field->report_count)
493                                 return 1;
494                         td->cc_index = field->index;
495                         td->cc_value_index = usage->usage_index;
496                         return 1;
497                 case HID_DG_CONTACTMAX:
498                         /* we don't set td->last_slot_field as contactcount and
499                          * contact max are global to the report */
500                         return -1;
501                 case HID_DG_TOUCH:
502                         /* Legacy devices use TIPSWITCH and not TOUCH.
503                          * Let's just ignore this field. */
504                         return -1;
505                 }
506                 /* let hid-input decide for the others */
507                 return 0;
508 
509         case HID_UP_BUTTON:
510                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
511                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
512                 input_set_capability(hi->input, EV_KEY, code);
513                 return 1;
514 
515         case 0xff000000:
516                 /* we do not want to map these: no input-oriented meaning */
517                 return -1;
518         }
519 
520         return 0;
521 }
522 
523 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
524                 struct hid_field *field, struct hid_usage *usage,
525                 unsigned long **bit, int *max)
526 {
527         if (usage->type == EV_KEY || usage->type == EV_ABS)
528                 set_bit(usage->type, hi->input->evbit);
529 
530         return -1;
531 }
532 
533 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
534 {
535         __s32 quirks = td->mtclass.quirks;
536 
537         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
538                 return td->curdata.contactid;
539 
540         if (quirks & MT_QUIRK_CYPRESS)
541                 return cypress_compute_slot(td);
542 
543         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
544                 return td->num_received;
545 
546         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
547                 return td->curdata.contactid - 1;
548 
549         return input_mt_get_slot_by_key(input, td->curdata.contactid);
550 }
551 
552 /*
553  * this function is called when a whole contact has been processed,
554  * so that it can assign it to a slot and store the data there
555  */
556 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
557 {
558         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
559             td->num_received >= td->num_expected)
560                 return;
561 
562         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
563                 int slotnum = mt_compute_slot(td, input);
564                 struct mt_slot *s = &td->curdata;
565                 struct input_mt *mt = input->mt;
566 
567                 if (slotnum < 0 || slotnum >= td->maxcontacts)
568                         return;
569 
570                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
571                         struct input_mt_slot *slot = &mt->slots[slotnum];
572                         if (input_mt_is_active(slot) &&
573                             input_mt_is_used(mt, slot))
574                                 return;
575                 }
576 
577                 input_mt_slot(input, slotnum);
578                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
579                         s->touch_state || s->inrange_state);
580                 if (s->touch_state || s->inrange_state) {
581                         /* this finger is in proximity of the sensor */
582                         int wide = (s->w > s->h);
583                         /* divided by two to match visual scale of touch */
584                         int major = max(s->w, s->h) >> 1;
585                         int minor = min(s->w, s->h) >> 1;
586 
587                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
588                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
589                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
590                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
591                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
592                                 !s->touch_state);
593                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
594                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
595                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
596                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
597                 }
598         }
599 
600         td->num_received++;
601 }
602 
603 /*
604  * this function is called when a whole packet has been received and processed,
605  * so that it can decide what to send to the input layer.
606  */
607 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
608 {
609         input_mt_sync_frame(input);
610         input_sync(input);
611         td->num_received = 0;
612 }
613 
614 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
615                                 struct hid_usage *usage, __s32 value)
616 {
617         /* we will handle the hidinput part later, now remains hiddev */
618         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
619                 hid->hiddev_hid_event(hid, field, usage, value);
620 
621         return 1;
622 }
623 
624 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
625                                 struct hid_usage *usage, __s32 value)
626 {
627         struct mt_device *td = hid_get_drvdata(hid);
628         __s32 quirks = td->mtclass.quirks;
629         struct input_dev *input = field->hidinput->input;
630 
631         if (hid->claimed & HID_CLAIMED_INPUT) {
632                 switch (usage->hid) {
633                 case HID_DG_INRANGE:
634                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
635                                 td->curvalid = value;
636                         if (quirks & MT_QUIRK_HOVERING)
637                                 td->curdata.inrange_state = value;
638                         break;
639                 case HID_DG_TIPSWITCH:
640                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
641                                 td->curvalid = value;
642                         td->curdata.touch_state = value;
643                         break;
644                 case HID_DG_CONFIDENCE:
645                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
646                                 td->curvalid = value;
647                         break;
648                 case HID_DG_CONTACTID:
649                         td->curdata.contactid = value;
650                         break;
651                 case HID_DG_TIPPRESSURE:
652                         td->curdata.p = value;
653                         break;
654                 case HID_GD_X:
655                         if (usage->code == ABS_MT_TOOL_X)
656                                 td->curdata.cx = value;
657                         else
658                                 td->curdata.x = value;
659                         break;
660                 case HID_GD_Y:
661                         if (usage->code == ABS_MT_TOOL_Y)
662                                 td->curdata.cy = value;
663                         else
664                                 td->curdata.y = value;
665                         break;
666                 case HID_DG_WIDTH:
667                         td->curdata.w = value;
668                         break;
669                 case HID_DG_HEIGHT:
670                         td->curdata.h = value;
671                         break;
672                 case HID_DG_CONTACTCOUNT:
673                         break;
674                 case HID_DG_TOUCH:
675                         /* do nothing */
676                         break;
677 
678                 default:
679                         if (usage->type)
680                                 input_event(input, usage->type, usage->code,
681                                                 value);
682                         return;
683                 }
684 
685                 if (usage->usage_index + 1 == field->report_count) {
686                         /* we only take into account the last report. */
687                         if (usage->hid == td->last_slot_field)
688                                 mt_complete_slot(td, field->hidinput->input);
689                 }
690 
691         }
692 }
693 
694 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
695 {
696         struct mt_device *td = hid_get_drvdata(hid);
697         struct hid_field *field;
698         unsigned count;
699         int r, n;
700 
701         /*
702          * Includes multi-packet support where subsequent
703          * packets are sent with zero contactcount.
704          */
705         if (td->cc_index >= 0) {
706                 struct hid_field *field = report->field[td->cc_index];
707                 int value = field->value[td->cc_value_index];
708                 if (value)
709                         td->num_expected = value;
710         }
711 
712         for (r = 0; r < report->maxfield; r++) {
713                 field = report->field[r];
714                 count = field->report_count;
715 
716                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
717                         continue;
718 
719                 for (n = 0; n < count; n++)
720                         mt_process_mt_event(hid, field, &field->usage[n],
721                                         field->value[n]);
722         }
723 
724         if (td->num_received >= td->num_expected)
725                 mt_sync_frame(td, report->field[0]->hidinput->input);
726 }
727 
728 static void mt_touch_input_configured(struct hid_device *hdev,
729                                         struct hid_input *hi)
730 {
731         struct mt_device *td = hid_get_drvdata(hdev);
732         struct mt_class *cls = &td->mtclass;
733         struct input_dev *input = hi->input;
734 
735         if (!td->maxcontacts)
736                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
737 
738         mt_post_parse(td);
739         if (td->serial_maybe)
740                 mt_post_parse_default_settings(td);
741 
742         if (cls->is_indirect)
743                 td->mt_flags |= INPUT_MT_POINTER;
744 
745         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
746                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
747 
748         /* check for clickpads */
749         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
750                 td->is_buttonpad = true;
751 
752         if (td->is_buttonpad)
753                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
754 
755         input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
756 
757         td->mt_flags = 0;
758 }
759 
760 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
761                 struct hid_field *field, struct hid_usage *usage,
762                 unsigned long **bit, int *max)
763 {
764         struct mt_device *td = hid_get_drvdata(hdev);
765 
766         /*
767          * If mtclass.export_all_inputs is not set, only map fields from
768          * TouchScreen or TouchPad collections. We need to ignore fields
769          * that belong to other collections such as Mouse that might have
770          * the same GenericDesktop usages.
771          */
772         if (!td->mtclass.export_all_inputs &&
773             field->application != HID_DG_TOUCHSCREEN &&
774             field->application != HID_DG_PEN &&
775             field->application != HID_DG_TOUCHPAD)
776                 return -1;
777 
778         /*
779          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
780          * for the stylus.
781          * The check for mt_report_id ensures we don't process
782          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
783          * collection, but within the report ID.
784          */
785         if (field->physical == HID_DG_STYLUS)
786                 return 0;
787         else if ((field->physical == 0) &&
788                  (field->report->id != td->mt_report_id) &&
789                  (td->mt_report_id != -1))
790                 return 0;
791 
792         if (field->application == HID_DG_TOUCHSCREEN ||
793             field->application == HID_DG_TOUCHPAD)
794                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
795 
796         /* let hid-core decide for the others */
797         return 0;
798 }
799 
800 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
801                 struct hid_field *field, struct hid_usage *usage,
802                 unsigned long **bit, int *max)
803 {
804         /*
805          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
806          * for the stylus.
807          */
808         if (field->physical == HID_DG_STYLUS)
809                 return 0;
810 
811         if (field->application == HID_DG_TOUCHSCREEN ||
812             field->application == HID_DG_TOUCHPAD)
813                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
814 
815         /* let hid-core decide for the others */
816         return 0;
817 }
818 
819 static int mt_event(struct hid_device *hid, struct hid_field *field,
820                                 struct hid_usage *usage, __s32 value)
821 {
822         struct mt_device *td = hid_get_drvdata(hid);
823 
824         if (field->report->id == td->mt_report_id)
825                 return mt_touch_event(hid, field, usage, value);
826 
827         return 0;
828 }
829 
830 static void mt_report(struct hid_device *hid, struct hid_report *report)
831 {
832         struct mt_device *td = hid_get_drvdata(hid);
833         struct hid_field *field = report->field[0];
834 
835         if (!(hid->claimed & HID_CLAIMED_INPUT))
836                 return;
837 
838         if (report->id == td->mt_report_id)
839                 return mt_touch_report(hid, report);
840 
841         if (field && field->hidinput && field->hidinput->input)
842                 input_sync(field->hidinput->input);
843 }
844 
845 static void mt_set_input_mode(struct hid_device *hdev)
846 {
847         struct mt_device *td = hid_get_drvdata(hdev);
848         struct hid_report *r;
849         struct hid_report_enum *re;
850         struct mt_class *cls = &td->mtclass;
851         char *buf;
852         int report_len;
853 
854         if (td->inputmode < 0)
855                 return;
856 
857         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
858         r = re->report_id_hash[td->inputmode];
859         if (r) {
860                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
861                         report_len = hid_report_len(r);
862                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
863                         if (!buf) {
864                                 hid_err(hdev, "failed to allocate buffer for report\n");
865                                 return;
866                         }
867                         hid_hw_raw_request(hdev, r->id, buf, report_len,
868                                            HID_FEATURE_REPORT,
869                                            HID_REQ_GET_REPORT);
870                         kfree(buf);
871                 }
872                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
873                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
874         }
875 }
876 
877 static void mt_set_maxcontacts(struct hid_device *hdev)
878 {
879         struct mt_device *td = hid_get_drvdata(hdev);
880         struct hid_report *r;
881         struct hid_report_enum *re;
882         int fieldmax, max;
883 
884         if (td->maxcontact_report_id < 0)
885                 return;
886 
887         if (!td->mtclass.maxcontacts)
888                 return;
889 
890         re = &hdev->report_enum[HID_FEATURE_REPORT];
891         r = re->report_id_hash[td->maxcontact_report_id];
892         if (r) {
893                 max = td->mtclass.maxcontacts;
894                 fieldmax = r->field[0]->logical_maximum;
895                 max = min(fieldmax, max);
896                 if (r->field[0]->value[0] != max) {
897                         r->field[0]->value[0] = max;
898                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
899                 }
900         }
901 }
902 
903 static void mt_post_parse_default_settings(struct mt_device *td)
904 {
905         __s32 quirks = td->mtclass.quirks;
906 
907         /* unknown serial device needs special quirks */
908         if (td->touches_by_report == 1) {
909                 quirks |= MT_QUIRK_ALWAYS_VALID;
910                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
911                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
912                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
913                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
914         }
915 
916         td->mtclass.quirks = quirks;
917 }
918 
919 static void mt_post_parse(struct mt_device *td)
920 {
921         struct mt_fields *f = td->fields;
922         struct mt_class *cls = &td->mtclass;
923 
924         if (td->touches_by_report > 0) {
925                 int field_count_per_touch = f->length / td->touches_by_report;
926                 td->last_slot_field = f->usages[field_count_per_touch - 1];
927         }
928 
929         if (td->cc_index < 0)
930                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
931 }
932 
933 static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
934 {
935         struct mt_device *td = hid_get_drvdata(hdev);
936         char *name;
937         const char *suffix = NULL;
938         struct hid_field *field = hi->report->field[0];
939 
940         if (hi->report->id == td->mt_report_id)
941                 mt_touch_input_configured(hdev, hi);
942 
943         /*
944          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
945          * for the stylus. Check this first, and then rely on the application
946          * field.
947          */
948         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
949                 suffix = "Pen";
950                 /* force BTN_STYLUS to allow tablet matching in udev */
951                 __set_bit(BTN_STYLUS, hi->input->keybit);
952         } else {
953                 switch (field->application) {
954                 case HID_GD_KEYBOARD:
955                         suffix = "Keyboard";
956                         break;
957                 case HID_GD_KEYPAD:
958                         suffix = "Keypad";
959                         break;
960                 case HID_GD_MOUSE:
961                         suffix = "Mouse";
962                         break;
963                 case HID_DG_STYLUS:
964                         suffix = "Pen";
965                         /* force BTN_STYLUS to allow tablet matching in udev */
966                         __set_bit(BTN_STYLUS, hi->input->keybit);
967                         break;
968                 case HID_DG_TOUCHSCREEN:
969                         /* we do not set suffix = "Touchscreen" */
970                         break;
971                 case HID_GD_SYSTEM_CONTROL:
972                         suffix = "System Control";
973                         break;
974                 case HID_CP_CONSUMER_CONTROL:
975                         suffix = "Consumer Control";
976                         break;
977                 default:
978                         suffix = "UNKNOWN";
979                         break;
980                 }
981         }
982 
983         if (suffix) {
984                 name = devm_kzalloc(&hi->input->dev,
985                                     strlen(hdev->name) + strlen(suffix) + 2,
986                                     GFP_KERNEL);
987                 if (name) {
988                         sprintf(name, "%s %s", hdev->name, suffix);
989                         hi->input->name = name;
990                 }
991         }
992 }
993 
994 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
995 {
996         int ret, i;
997         struct mt_device *td;
998         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
999 
1000         for (i = 0; mt_classes[i].name ; i++) {
1001                 if (id->driver_data == mt_classes[i].name) {
1002                         mtclass = &(mt_classes[i]);
1003                         break;
1004                 }
1005         }
1006 
1007         /* This allows the driver to correctly support devices
1008          * that emit events over several HID messages.
1009          */
1010         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1011 
1012         /*
1013          * This allows the driver to handle different input sensors
1014          * that emits events through different reports on the same HID
1015          * device.
1016          */
1017         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1018         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1019 
1020         /*
1021          * Handle special quirks for Windows 8 certified devices.
1022          */
1023         if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
1024                 /*
1025                  * Some multitouch screens do not like to be polled for input
1026                  * reports. Fortunately, the Win8 spec says that all touches
1027                  * should be sent during each report, making the initialization
1028                  * of input reports unnecessary.
1029                  */
1030                 hdev->quirks |= HID_QUIRK_NO_INIT_INPUT_REPORTS;
1031 
1032         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1033         if (!td) {
1034                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1035                 return -ENOMEM;
1036         }
1037         td->mtclass = *mtclass;
1038         td->inputmode = -1;
1039         td->maxcontact_report_id = -1;
1040         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1041         td->cc_index = -1;
1042         td->mt_report_id = -1;
1043         hid_set_drvdata(hdev, td);
1044 
1045         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1046                                   GFP_KERNEL);
1047         if (!td->fields) {
1048                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1049                 return -ENOMEM;
1050         }
1051 
1052         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1053                 td->serial_maybe = true;
1054 
1055         ret = hid_parse(hdev);
1056         if (ret != 0)
1057                 return ret;
1058 
1059         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1060         if (ret)
1061                 return ret;
1062 
1063         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1064 
1065         mt_set_maxcontacts(hdev);
1066         mt_set_input_mode(hdev);
1067 
1068         /* release .fields memory as it is not used anymore */
1069         devm_kfree(&hdev->dev, td->fields);
1070         td->fields = NULL;
1071 
1072         return 0;
1073 }
1074 
1075 #ifdef CONFIG_PM
1076 static int mt_reset_resume(struct hid_device *hdev)
1077 {
1078         mt_set_maxcontacts(hdev);
1079         mt_set_input_mode(hdev);
1080         return 0;
1081 }
1082 
1083 static int mt_resume(struct hid_device *hdev)
1084 {
1085         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1086          * It should be safe to send it to other devices too.
1087          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1088 
1089         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1090 
1091         return 0;
1092 }
1093 #endif
1094 
1095 static void mt_remove(struct hid_device *hdev)
1096 {
1097         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1098         hid_hw_stop(hdev);
1099 }
1100 
1101 /*
1102  * This list contains only:
1103  * - VID/PID of products not working with the default multitouch handling
1104  * - 2 generic rules.
1105  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1106  */
1107 static const struct hid_device_id mt_devices[] = {
1108 
1109         /* 3M panels */
1110         { .driver_data = MT_CLS_3M,
1111                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1112                         USB_DEVICE_ID_3M1968) },
1113         { .driver_data = MT_CLS_3M,
1114                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1115                         USB_DEVICE_ID_3M2256) },
1116         { .driver_data = MT_CLS_3M,
1117                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1118                         USB_DEVICE_ID_3M3266) },
1119 
1120         /* Anton devices */
1121         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1122                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1123                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1124 
1125         /* Atmel panels */
1126         { .driver_data = MT_CLS_SERIAL,
1127                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1128                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1129 
1130         /* Baanto multitouch devices */
1131         { .driver_data = MT_CLS_NSMU,
1132                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1133                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1134 
1135         /* Cando panels */
1136         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1137                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1138                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1139         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1140                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1141                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1142 
1143         /* Chunghwa Telecom touch panels */
1144         {  .driver_data = MT_CLS_NSMU,
1145                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1146                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1147 
1148         /* CVTouch panels */
1149         { .driver_data = MT_CLS_NSMU,
1150                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1151                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1152 
1153         /* eGalax devices (resistive) */
1154         { .driver_data = MT_CLS_EGALAX,
1155                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1156                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1157         { .driver_data = MT_CLS_EGALAX,
1158                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1159                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1160 
1161         /* eGalax devices (capacitive) */
1162         { .driver_data = MT_CLS_EGALAX_SERIAL,
1163                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1164                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1165         { .driver_data = MT_CLS_EGALAX,
1166                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1167                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1168         { .driver_data = MT_CLS_EGALAX_SERIAL,
1169                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1170                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1171         { .driver_data = MT_CLS_EGALAX_SERIAL,
1172                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1173                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1174         { .driver_data = MT_CLS_EGALAX_SERIAL,
1175                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1176                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1177         { .driver_data = MT_CLS_EGALAX_SERIAL,
1178                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1179                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1180         { .driver_data = MT_CLS_EGALAX,
1181                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1182                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1183         { .driver_data = MT_CLS_EGALAX,
1184                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1185                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1186         { .driver_data = MT_CLS_EGALAX_SERIAL,
1187                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1188                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1189         { .driver_data = MT_CLS_EGALAX,
1190                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1191                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1192         { .driver_data = MT_CLS_EGALAX,
1193                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1194                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1195         { .driver_data = MT_CLS_EGALAX,
1196                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1197                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1198         { .driver_data = MT_CLS_EGALAX,
1199                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1200                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1201         { .driver_data = MT_CLS_EGALAX_SERIAL,
1202                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1203                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1204         { .driver_data = MT_CLS_EGALAX_SERIAL,
1205                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1206                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1207         { .driver_data = MT_CLS_EGALAX_SERIAL,
1208                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1209                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1210 
1211         /* Elitegroup panel */
1212         { .driver_data = MT_CLS_SERIAL,
1213                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1214                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1215 
1216         /* Flatfrog Panels */
1217         { .driver_data = MT_CLS_FLATFROG,
1218                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1219                         USB_DEVICE_ID_MULTITOUCH_3200) },
1220 
1221         /* FocalTech Panels */
1222         { .driver_data = MT_CLS_SERIAL,
1223                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1224                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1225 
1226         /* GeneralTouch panel */
1227         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1228                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1229                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1230         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1231                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1232                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1233         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1234                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1235                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1236         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1237                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1238                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1239         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1240                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1241                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1242         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1243                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1244                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1245         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1246                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1247                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1248 
1249         /* Gametel game controller */
1250         { .driver_data = MT_CLS_NSMU,
1251                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1252                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1253 
1254         /* GoodTouch panels */
1255         { .driver_data = MT_CLS_NSMU,
1256                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1257                         USB_DEVICE_ID_GOODTOUCH_000f) },
1258 
1259         /* Hanvon panels */
1260         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1261                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1262                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1263 
1264         /* Ilitek dual touch panel */
1265         {  .driver_data = MT_CLS_NSMU,
1266                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1267                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1268 
1269         /* MosArt panels */
1270         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1271                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1272                         USB_DEVICE_ID_ASUS_T91MT)},
1273         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1274                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1275                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1276         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1277                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1278                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1279 
1280         /* Panasonic panels */
1281         { .driver_data = MT_CLS_PANASONIC,
1282                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1283                         USB_DEVICE_ID_PANABOARD_UBT780) },
1284         { .driver_data = MT_CLS_PANASONIC,
1285                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1286                         USB_DEVICE_ID_PANABOARD_UBT880) },
1287 
1288         /* Novatek Panel */
1289         { .driver_data = MT_CLS_NSMU,
1290                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1291                         USB_DEVICE_ID_NOVATEK_PCT) },
1292 
1293         /* PixArt optical touch screen */
1294         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1296                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1297         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1298                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1299                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1300         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1301                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1302                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1303 
1304         /* PixCir-based panels */
1305         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1306                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1307                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1308 
1309         /* Quanta-based panels */
1310         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1311                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1312                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1313 
1314         /* Stantum panels */
1315         { .driver_data = MT_CLS_CONFIDENCE,
1316                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1317                         USB_DEVICE_ID_MTP_STM)},
1318 
1319         /* TopSeed panels */
1320         { .driver_data = MT_CLS_TOPSEED,
1321                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1322                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1323 
1324         /* Touch International panels */
1325         { .driver_data = MT_CLS_NSMU,
1326                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1327                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1328 
1329         /* Unitec panels */
1330         { .driver_data = MT_CLS_NSMU,
1331                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1332                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1333         { .driver_data = MT_CLS_NSMU,
1334                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1335                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1336 
1337         /* VTL panels */
1338         { .driver_data = MT_CLS_VTL,
1339                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1340                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1341 
1342         /* Wistron panels */
1343         { .driver_data = MT_CLS_NSMU,
1344                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1345                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1346 
1347         /* XAT */
1348         { .driver_data = MT_CLS_NSMU,
1349                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1350                         USB_DEVICE_ID_XAT_CSR) },
1351 
1352         /* Xiroku */
1353         { .driver_data = MT_CLS_NSMU,
1354                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1355                         USB_DEVICE_ID_XIROKU_SPX) },
1356         { .driver_data = MT_CLS_NSMU,
1357                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1358                         USB_DEVICE_ID_XIROKU_MPX) },
1359         { .driver_data = MT_CLS_NSMU,
1360                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1361                         USB_DEVICE_ID_XIROKU_CSR) },
1362         { .driver_data = MT_CLS_NSMU,
1363                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1364                         USB_DEVICE_ID_XIROKU_SPX1) },
1365         { .driver_data = MT_CLS_NSMU,
1366                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1367                         USB_DEVICE_ID_XIROKU_MPX1) },
1368         { .driver_data = MT_CLS_NSMU,
1369                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1370                         USB_DEVICE_ID_XIROKU_CSR1) },
1371         { .driver_data = MT_CLS_NSMU,
1372                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1373                         USB_DEVICE_ID_XIROKU_SPX2) },
1374         { .driver_data = MT_CLS_NSMU,
1375                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1376                         USB_DEVICE_ID_XIROKU_MPX2) },
1377         { .driver_data = MT_CLS_NSMU,
1378                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1379                         USB_DEVICE_ID_XIROKU_CSR2) },
1380 
1381         /* Generic MT device */
1382         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1383 
1384         /* Generic Win 8 certified MT device */
1385         {  .driver_data = MT_CLS_WIN_8,
1386                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1387                         HID_ANY_ID, HID_ANY_ID) },
1388         { }
1389 };
1390 MODULE_DEVICE_TABLE(hid, mt_devices);
1391 
1392 static const struct hid_usage_id mt_grabbed_usages[] = {
1393         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1394         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1395 };
1396 
1397 static struct hid_driver mt_driver = {
1398         .name = "hid-multitouch",
1399         .id_table = mt_devices,
1400         .probe = mt_probe,
1401         .remove = mt_remove,
1402         .input_mapping = mt_input_mapping,
1403         .input_mapped = mt_input_mapped,
1404         .input_configured = mt_input_configured,
1405         .feature_mapping = mt_feature_mapping,
1406         .usage_table = mt_grabbed_usages,
1407         .event = mt_event,
1408         .report = mt_report,
1409 #ifdef CONFIG_PM
1410         .reset_resume = mt_reset_resume,
1411         .resume = mt_resume,
1412 #endif
1413 };
1414 module_hid_driver(mt_driver);
1415 

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