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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_CONFIDENCE             (1 << 7)
 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 #define MT_BUTTONTYPE_CLICKPAD          0
 76 
 77 struct mt_slot {
 78         __s32 x, y, cx, cy, p, w, h;
 79         __s32 contactid;        /* the device ContactID assigned to this slot */
 80         bool touch_state;       /* is the touch valid? */
 81         bool inrange_state;     /* is the finger in proximity of the sensor? */
 82         bool confidence_state;  /* is the touch made by a finger? */
 83 };
 84 
 85 struct mt_class {
 86         __s32 name;     /* MT_CLS */
 87         __s32 quirks;
 88         __s32 sn_move;  /* Signal/noise ratio for move events */
 89         __s32 sn_width; /* Signal/noise ratio for width events */
 90         __s32 sn_height;        /* Signal/noise ratio for height events */
 91         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
 92         __u8 maxcontacts;
 93         bool is_indirect;       /* true for touchpads */
 94         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
 95 };
 96 
 97 struct mt_fields {
 98         unsigned usages[HID_MAX_FIELDS];
 99         unsigned int length;
100 };
101 
102 struct mt_device {
103         struct mt_slot curdata; /* placeholder of incoming data */
104         struct mt_class mtclass;        /* our mt device class */
105         struct mt_fields *fields;       /* temporary placeholder for storing the
106                                            multitouch fields */
107         int cc_index;   /* contact count field index in the report */
108         int cc_value_index;     /* contact count value index in the field */
109         unsigned last_slot_field;       /* the last field of a slot */
110         unsigned mt_report_id;  /* the report ID of the multitouch device */
111         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
112         __s16 inputmode_index;  /* InputMode HID feature index in the report */
113         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
114                                    -1 if non-existent */
115         __u8 inputmode_value;  /* InputMode HID feature value */
116         __u8 num_received;      /* how many contacts we received */
117         __u8 num_expected;      /* expected last contact index */
118         __u8 maxcontacts;
119         __u8 touches_by_report; /* how many touches are present in one report:
120                                 * 1 means we should use a serial protocol
121                                 * > 1 means hybrid (multitouch) protocol */
122         __u8 buttons_count;     /* number of physical buttons per touchpad */
123         bool is_buttonpad;      /* is this device a button pad? */
124         bool serial_maybe;      /* need to check for serial protocol */
125         bool curvalid;          /* is the current contact valid? */
126         unsigned mt_flags;      /* flags to pass to input-mt */
127 };
128 
129 static void mt_post_parse_default_settings(struct mt_device *td);
130 static void mt_post_parse(struct mt_device *td);
131 
132 /* classes of device behavior */
133 #define MT_CLS_DEFAULT                          0x0001
134 
135 #define MT_CLS_SERIAL                           0x0002
136 #define MT_CLS_CONFIDENCE                       0x0003
137 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
138 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
139 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
140 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
141 /* reserved                                     0x0008 */
142 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
143 #define MT_CLS_NSMU                             0x000a
144 /* reserved                                     0x0010 */
145 /* reserved                                     0x0011 */
146 #define MT_CLS_WIN_8                            0x0012
147 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
148 
149 /* vendor specific classes */
150 #define MT_CLS_3M                               0x0101
151 /* reserved                                     0x0102 */
152 #define MT_CLS_EGALAX                           0x0103
153 #define MT_CLS_EGALAX_SERIAL                    0x0104
154 #define MT_CLS_TOPSEED                          0x0105
155 #define MT_CLS_PANASONIC                        0x0106
156 #define MT_CLS_FLATFROG                         0x0107
157 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
158 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
159 #define MT_CLS_VTL                              0x0110
160 
161 #define MT_DEFAULT_MAXCONTACT   10
162 #define MT_MAX_MAXCONTACT       250
163 
164 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
165 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
166 
167 /*
168  * these device-dependent functions determine what slot corresponds
169  * to a valid contact that was just read.
170  */
171 
172 static int cypress_compute_slot(struct mt_device *td)
173 {
174         if (td->curdata.contactid != 0 || td->num_received == 0)
175                 return td->curdata.contactid;
176         else
177                 return -1;
178 }
179 
180 static struct mt_class mt_classes[] = {
181         { .name = MT_CLS_DEFAULT,
182                 .quirks = MT_QUIRK_ALWAYS_VALID |
183                         MT_QUIRK_CONTACT_CNT_ACCURATE },
184         { .name = MT_CLS_NSMU,
185                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
186         { .name = MT_CLS_SERIAL,
187                 .quirks = MT_QUIRK_ALWAYS_VALID},
188         { .name = MT_CLS_CONFIDENCE,
189                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
190         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
191                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
192                         MT_QUIRK_SLOT_IS_CONTACTID },
193         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
194                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
195                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
196         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
197                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
198                         MT_QUIRK_SLOT_IS_CONTACTID,
199                 .maxcontacts = 2 },
200         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
201                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
202                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
203                 .maxcontacts = 2 },
204         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
205                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
206                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
207         { .name = MT_CLS_WIN_8,
208                 .quirks = MT_QUIRK_ALWAYS_VALID |
209                         MT_QUIRK_IGNORE_DUPLICATES |
210                         MT_QUIRK_HOVERING |
211                         MT_QUIRK_CONTACT_CNT_ACCURATE },
212         { .name = MT_CLS_EXPORT_ALL_INPUTS,
213                 .quirks = MT_QUIRK_ALWAYS_VALID |
214                         MT_QUIRK_CONTACT_CNT_ACCURATE,
215                 .export_all_inputs = true },
216 
217         /*
218          * vendor specific classes
219          */
220         { .name = MT_CLS_3M,
221                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
222                         MT_QUIRK_SLOT_IS_CONTACTID,
223                 .sn_move = 2048,
224                 .sn_width = 128,
225                 .sn_height = 128,
226                 .maxcontacts = 60,
227         },
228         { .name = MT_CLS_EGALAX,
229                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
230                         MT_QUIRK_VALID_IS_INRANGE,
231                 .sn_move = 4096,
232                 .sn_pressure = 32,
233         },
234         { .name = MT_CLS_EGALAX_SERIAL,
235                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
236                         MT_QUIRK_ALWAYS_VALID,
237                 .sn_move = 4096,
238                 .sn_pressure = 32,
239         },
240         { .name = MT_CLS_TOPSEED,
241                 .quirks = MT_QUIRK_ALWAYS_VALID,
242                 .is_indirect = true,
243                 .maxcontacts = 2,
244         },
245         { .name = MT_CLS_PANASONIC,
246                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
247                 .maxcontacts = 4 },
248         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
249                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
250                         MT_QUIRK_VALID_IS_INRANGE |
251                         MT_QUIRK_SLOT_IS_CONTACTID,
252                 .maxcontacts = 2
253         },
254         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
255                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
256                         MT_QUIRK_SLOT_IS_CONTACTID
257         },
258 
259         { .name = MT_CLS_FLATFROG,
260                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
261                         MT_QUIRK_NO_AREA,
262                 .sn_move = 2048,
263                 .maxcontacts = 40,
264         },
265         { .name = MT_CLS_VTL,
266                 .quirks = MT_QUIRK_ALWAYS_VALID |
267                         MT_QUIRK_CONTACT_CNT_ACCURATE |
268                         MT_QUIRK_FORCE_GET_FEATURE,
269         },
270         { }
271 };
272 
273 static ssize_t mt_show_quirks(struct device *dev,
274                            struct device_attribute *attr,
275                            char *buf)
276 {
277         struct hid_device *hdev = to_hid_device(dev);
278         struct mt_device *td = hid_get_drvdata(hdev);
279 
280         return sprintf(buf, "%u\n", td->mtclass.quirks);
281 }
282 
283 static ssize_t mt_set_quirks(struct device *dev,
284                           struct device_attribute *attr,
285                           const char *buf, size_t count)
286 {
287         struct hid_device *hdev = to_hid_device(dev);
288         struct mt_device *td = hid_get_drvdata(hdev);
289 
290         unsigned long val;
291 
292         if (kstrtoul(buf, 0, &val))
293                 return -EINVAL;
294 
295         td->mtclass.quirks = val;
296 
297         if (td->cc_index < 0)
298                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
299 
300         return count;
301 }
302 
303 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
304 
305 static struct attribute *sysfs_attrs[] = {
306         &dev_attr_quirks.attr,
307         NULL
308 };
309 
310 static struct attribute_group mt_attribute_group = {
311         .attrs = sysfs_attrs
312 };
313 
314 static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
315 {
316         struct mt_device *td = hid_get_drvdata(hdev);
317         int ret, size = hid_report_len(report);
318         u8 *buf;
319 
320         /*
321          * Only fetch the feature report if initial reports are not already
322          * been retrieved. Currently this is only done for Windows 8 touch
323          * devices.
324          */
325         if (!(hdev->quirks & HID_QUIRK_NO_INIT_REPORTS))
326                 return;
327         if (td->mtclass.name != MT_CLS_WIN_8)
328                 return;
329 
330         buf = hid_alloc_report_buf(report, GFP_KERNEL);
331         if (!buf)
332                 return;
333 
334         ret = hid_hw_raw_request(hdev, report->id, buf, size,
335                                  HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
336         if (ret < 0) {
337                 dev_warn(&hdev->dev, "failed to fetch feature %d\n",
338                          report->id);
339         } else {
340                 ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
341                                            size, 0);
342                 if (ret)
343                         dev_warn(&hdev->dev, "failed to report feature\n");
344         }
345 
346         kfree(buf);
347 }
348 
349 static void mt_feature_mapping(struct hid_device *hdev,
350                 struct hid_field *field, struct hid_usage *usage)
351 {
352         struct mt_device *td = hid_get_drvdata(hdev);
353 
354         switch (usage->hid) {
355         case HID_DG_INPUTMODE:
356                 /* Ignore if value index is out of bounds. */
357                 if (usage->usage_index >= field->report_count) {
358                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
359                         break;
360                 }
361 
362                 if (td->inputmode < 0) {
363                         td->inputmode = field->report->id;
364                         td->inputmode_index = usage->usage_index;
365                 } else {
366                         /*
367                          * Some elan panels wrongly declare 2 input mode
368                          * features, and silently ignore when we set the
369                          * value in the second field. Skip the second feature
370                          * and hope for the best.
371                          */
372                         dev_info(&hdev->dev,
373                                  "Ignoring the extra HID_DG_INPUTMODE\n");
374                 }
375 
376                 break;
377         case HID_DG_CONTACTMAX:
378                 mt_get_feature(hdev, field->report);
379 
380                 td->maxcontact_report_id = field->report->id;
381                 td->maxcontacts = field->value[0];
382                 if (!td->maxcontacts &&
383                     field->logical_maximum <= MT_MAX_MAXCONTACT)
384                         td->maxcontacts = field->logical_maximum;
385                 if (td->mtclass.maxcontacts)
386                         /* check if the maxcontacts is given by the class */
387                         td->maxcontacts = td->mtclass.maxcontacts;
388 
389                 break;
390         case HID_DG_BUTTONTYPE:
391                 if (usage->usage_index >= field->report_count) {
392                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
393                         break;
394                 }
395 
396                 mt_get_feature(hdev, field->report);
397                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
398                         td->is_buttonpad = true;
399 
400                 break;
401         case 0xff0000c5:
402                 /* Retrieve the Win8 blob once to enable some devices */
403                 if (usage->usage_index == 0)
404                         mt_get_feature(hdev, field->report);
405                 break;
406         }
407 }
408 
409 static void set_abs(struct input_dev *input, unsigned int code,
410                 struct hid_field *field, int snratio)
411 {
412         int fmin = field->logical_minimum;
413         int fmax = field->logical_maximum;
414         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
415         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
416         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
417 }
418 
419 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
420                 struct hid_input *hi)
421 {
422         struct mt_fields *f = td->fields;
423 
424         if (f->length >= HID_MAX_FIELDS)
425                 return;
426 
427         f->usages[f->length++] = usage->hid;
428 }
429 
430 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
431                 struct hid_field *field, struct hid_usage *usage,
432                 unsigned long **bit, int *max)
433 {
434         struct mt_device *td = hid_get_drvdata(hdev);
435         struct mt_class *cls = &td->mtclass;
436         int code;
437         struct hid_usage *prev_usage = NULL;
438 
439         if (field->application == HID_DG_TOUCHSCREEN)
440                 td->mt_flags |= INPUT_MT_DIRECT;
441 
442         /*
443          * Model touchscreens providing buttons as touchpads.
444          */
445         if (field->application == HID_DG_TOUCHPAD ||
446             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
447                 td->mt_flags |= INPUT_MT_POINTER;
448                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
449         }
450 
451         /* count the buttons on touchpads */
452         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
453                 td->buttons_count++;
454 
455         if (usage->usage_index)
456                 prev_usage = &field->usage[usage->usage_index - 1];
457 
458         switch (usage->hid & HID_USAGE_PAGE) {
459 
460         case HID_UP_GENDESK:
461                 switch (usage->hid) {
462                 case HID_GD_X:
463                         if (prev_usage && (prev_usage->hid == usage->hid)) {
464                                 hid_map_usage(hi, usage, bit, max,
465                                         EV_ABS, ABS_MT_TOOL_X);
466                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
467                                         cls->sn_move);
468                         } else {
469                                 hid_map_usage(hi, usage, bit, max,
470                                         EV_ABS, ABS_MT_POSITION_X);
471                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
472                                         cls->sn_move);
473                         }
474 
475                         mt_store_field(usage, td, hi);
476                         return 1;
477                 case HID_GD_Y:
478                         if (prev_usage && (prev_usage->hid == usage->hid)) {
479                                 hid_map_usage(hi, usage, bit, max,
480                                         EV_ABS, ABS_MT_TOOL_Y);
481                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
482                                         cls->sn_move);
483                         } else {
484                                 hid_map_usage(hi, usage, bit, max,
485                                         EV_ABS, ABS_MT_POSITION_Y);
486                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
487                                         cls->sn_move);
488                         }
489 
490                         mt_store_field(usage, td, hi);
491                         return 1;
492                 }
493                 return 0;
494 
495         case HID_UP_DIGITIZER:
496                 switch (usage->hid) {
497                 case HID_DG_INRANGE:
498                         if (cls->quirks & MT_QUIRK_HOVERING) {
499                                 hid_map_usage(hi, usage, bit, max,
500                                         EV_ABS, ABS_MT_DISTANCE);
501                                 input_set_abs_params(hi->input,
502                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
503                         }
504                         mt_store_field(usage, td, hi);
505                         return 1;
506                 case HID_DG_CONFIDENCE:
507                         if (cls->name == MT_CLS_WIN_8 &&
508                                 field->application == HID_DG_TOUCHPAD)
509                                 cls->quirks |= MT_QUIRK_CONFIDENCE;
510                         mt_store_field(usage, td, hi);
511                         return 1;
512                 case HID_DG_TIPSWITCH:
513                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
514                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
515                         mt_store_field(usage, td, hi);
516                         return 1;
517                 case HID_DG_CONTACTID:
518                         mt_store_field(usage, td, hi);
519                         td->touches_by_report++;
520                         td->mt_report_id = field->report->id;
521                         return 1;
522                 case HID_DG_WIDTH:
523                         hid_map_usage(hi, usage, bit, max,
524                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
525                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
526                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
527                                         cls->sn_width);
528                         mt_store_field(usage, td, hi);
529                         return 1;
530                 case HID_DG_HEIGHT:
531                         hid_map_usage(hi, usage, bit, max,
532                                         EV_ABS, ABS_MT_TOUCH_MINOR);
533                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
534                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
535                                         cls->sn_height);
536                                 input_set_abs_params(hi->input,
537                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
538                         }
539                         mt_store_field(usage, td, hi);
540                         return 1;
541                 case HID_DG_TIPPRESSURE:
542                         hid_map_usage(hi, usage, bit, max,
543                                         EV_ABS, ABS_MT_PRESSURE);
544                         set_abs(hi->input, ABS_MT_PRESSURE, field,
545                                 cls->sn_pressure);
546                         mt_store_field(usage, td, hi);
547                         return 1;
548                 case HID_DG_CONTACTCOUNT:
549                         /* Ignore if indexes are out of bounds. */
550                         if (field->index >= field->report->maxfield ||
551                             usage->usage_index >= field->report_count)
552                                 return 1;
553                         td->cc_index = field->index;
554                         td->cc_value_index = usage->usage_index;
555                         return 1;
556                 case HID_DG_CONTACTMAX:
557                         /* we don't set td->last_slot_field as contactcount and
558                          * contact max are global to the report */
559                         return -1;
560                 case HID_DG_TOUCH:
561                         /* Legacy devices use TIPSWITCH and not TOUCH.
562                          * Let's just ignore this field. */
563                         return -1;
564                 }
565                 /* let hid-input decide for the others */
566                 return 0;
567 
568         case HID_UP_BUTTON:
569                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
570                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
571                 input_set_capability(hi->input, EV_KEY, code);
572                 return 1;
573 
574         case 0xff000000:
575                 /* we do not want to map these: no input-oriented meaning */
576                 return -1;
577         }
578 
579         return 0;
580 }
581 
582 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
583                 struct hid_field *field, struct hid_usage *usage,
584                 unsigned long **bit, int *max)
585 {
586         if (usage->type == EV_KEY || usage->type == EV_ABS)
587                 set_bit(usage->type, hi->input->evbit);
588 
589         return -1;
590 }
591 
592 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
593 {
594         __s32 quirks = td->mtclass.quirks;
595 
596         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
597                 return td->curdata.contactid;
598 
599         if (quirks & MT_QUIRK_CYPRESS)
600                 return cypress_compute_slot(td);
601 
602         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
603                 return td->num_received;
604 
605         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
606                 return td->curdata.contactid - 1;
607 
608         return input_mt_get_slot_by_key(input, td->curdata.contactid);
609 }
610 
611 /*
612  * this function is called when a whole contact has been processed,
613  * so that it can assign it to a slot and store the data there
614  */
615 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
616 {
617         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
618             td->num_received >= td->num_expected)
619                 return;
620 
621         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
622                 int active;
623                 int slotnum = mt_compute_slot(td, input);
624                 struct mt_slot *s = &td->curdata;
625                 struct input_mt *mt = input->mt;
626 
627                 if (slotnum < 0 || slotnum >= td->maxcontacts)
628                         return;
629 
630                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
631                         struct input_mt_slot *slot = &mt->slots[slotnum];
632                         if (input_mt_is_active(slot) &&
633                             input_mt_is_used(mt, slot))
634                                 return;
635                 }
636 
637                 if (!(td->mtclass.quirks & MT_QUIRK_CONFIDENCE))
638                         s->confidence_state = 1;
639                 active = (s->touch_state || s->inrange_state) &&
640                                                         s->confidence_state;
641 
642                 input_mt_slot(input, slotnum);
643                 input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
644                 if (active) {
645                         /* this finger is in proximity of the sensor */
646                         int wide = (s->w > s->h);
647                         /* divided by two to match visual scale of touch */
648                         int major = max(s->w, s->h) >> 1;
649                         int minor = min(s->w, s->h) >> 1;
650 
651                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
652                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
653                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
654                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
655                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
656                                 !s->touch_state);
657                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
658                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
659                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
660                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
661                 }
662         }
663 
664         td->num_received++;
665 }
666 
667 /*
668  * this function is called when a whole packet has been received and processed,
669  * so that it can decide what to send to the input layer.
670  */
671 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
672 {
673         input_mt_sync_frame(input);
674         input_sync(input);
675         td->num_received = 0;
676 }
677 
678 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
679                                 struct hid_usage *usage, __s32 value)
680 {
681         /* we will handle the hidinput part later, now remains hiddev */
682         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
683                 hid->hiddev_hid_event(hid, field, usage, value);
684 
685         return 1;
686 }
687 
688 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
689                                 struct hid_usage *usage, __s32 value)
690 {
691         struct mt_device *td = hid_get_drvdata(hid);
692         __s32 quirks = td->mtclass.quirks;
693         struct input_dev *input = field->hidinput->input;
694 
695         if (hid->claimed & HID_CLAIMED_INPUT) {
696                 switch (usage->hid) {
697                 case HID_DG_INRANGE:
698                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
699                                 td->curvalid = value;
700                         if (quirks & MT_QUIRK_HOVERING)
701                                 td->curdata.inrange_state = value;
702                         break;
703                 case HID_DG_TIPSWITCH:
704                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
705                                 td->curvalid = value;
706                         td->curdata.touch_state = value;
707                         break;
708                 case HID_DG_CONFIDENCE:
709                         if (quirks & MT_QUIRK_CONFIDENCE)
710                                 td->curdata.confidence_state = value;
711                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
712                                 td->curvalid = value;
713                         break;
714                 case HID_DG_CONTACTID:
715                         td->curdata.contactid = value;
716                         break;
717                 case HID_DG_TIPPRESSURE:
718                         td->curdata.p = value;
719                         break;
720                 case HID_GD_X:
721                         if (usage->code == ABS_MT_TOOL_X)
722                                 td->curdata.cx = value;
723                         else
724                                 td->curdata.x = value;
725                         break;
726                 case HID_GD_Y:
727                         if (usage->code == ABS_MT_TOOL_Y)
728                                 td->curdata.cy = value;
729                         else
730                                 td->curdata.y = value;
731                         break;
732                 case HID_DG_WIDTH:
733                         td->curdata.w = value;
734                         break;
735                 case HID_DG_HEIGHT:
736                         td->curdata.h = value;
737                         break;
738                 case HID_DG_CONTACTCOUNT:
739                         break;
740                 case HID_DG_TOUCH:
741                         /* do nothing */
742                         break;
743 
744                 default:
745                         if (usage->type)
746                                 input_event(input, usage->type, usage->code,
747                                                 value);
748                         return;
749                 }
750 
751                 if (usage->usage_index + 1 == field->report_count) {
752                         /* we only take into account the last report. */
753                         if (usage->hid == td->last_slot_field)
754                                 mt_complete_slot(td, field->hidinput->input);
755                 }
756 
757         }
758 }
759 
760 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
761 {
762         struct mt_device *td = hid_get_drvdata(hid);
763         struct hid_field *field;
764         unsigned count;
765         int r, n;
766 
767         /*
768          * Includes multi-packet support where subsequent
769          * packets are sent with zero contactcount.
770          */
771         if (td->cc_index >= 0) {
772                 struct hid_field *field = report->field[td->cc_index];
773                 int value = field->value[td->cc_value_index];
774                 if (value)
775                         td->num_expected = value;
776         }
777 
778         for (r = 0; r < report->maxfield; r++) {
779                 field = report->field[r];
780                 count = field->report_count;
781 
782                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
783                         continue;
784 
785                 for (n = 0; n < count; n++)
786                         mt_process_mt_event(hid, field, &field->usage[n],
787                                         field->value[n]);
788         }
789 
790         if (td->num_received >= td->num_expected)
791                 mt_sync_frame(td, report->field[0]->hidinput->input);
792 }
793 
794 static int mt_touch_input_configured(struct hid_device *hdev,
795                                         struct hid_input *hi)
796 {
797         struct mt_device *td = hid_get_drvdata(hdev);
798         struct mt_class *cls = &td->mtclass;
799         struct input_dev *input = hi->input;
800         int ret;
801 
802         if (!td->maxcontacts)
803                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
804 
805         mt_post_parse(td);
806         if (td->serial_maybe)
807                 mt_post_parse_default_settings(td);
808 
809         if (cls->is_indirect)
810                 td->mt_flags |= INPUT_MT_POINTER;
811 
812         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
813                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
814 
815         /* check for clickpads */
816         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
817                 td->is_buttonpad = true;
818 
819         if (td->is_buttonpad)
820                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
821 
822         ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
823         if (ret)
824                 return ret;
825 
826         td->mt_flags = 0;
827         return 0;
828 }
829 
830 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
831                 struct hid_field *field, struct hid_usage *usage,
832                 unsigned long **bit, int *max)
833 {
834         struct mt_device *td = hid_get_drvdata(hdev);
835 
836         /*
837          * If mtclass.export_all_inputs is not set, only map fields from
838          * TouchScreen or TouchPad collections. We need to ignore fields
839          * that belong to other collections such as Mouse that might have
840          * the same GenericDesktop usages.
841          */
842         if (!td->mtclass.export_all_inputs &&
843             field->application != HID_DG_TOUCHSCREEN &&
844             field->application != HID_DG_PEN &&
845             field->application != HID_DG_TOUCHPAD)
846                 return -1;
847 
848         /*
849          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
850          * for the stylus.
851          * The check for mt_report_id ensures we don't process
852          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
853          * collection, but within the report ID.
854          */
855         if (field->physical == HID_DG_STYLUS)
856                 return 0;
857         else if ((field->physical == 0) &&
858                  (field->report->id != td->mt_report_id) &&
859                  (td->mt_report_id != -1))
860                 return 0;
861 
862         if (field->application == HID_DG_TOUCHSCREEN ||
863             field->application == HID_DG_TOUCHPAD)
864                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
865 
866         /* let hid-core decide for the others */
867         return 0;
868 }
869 
870 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
871                 struct hid_field *field, struct hid_usage *usage,
872                 unsigned long **bit, int *max)
873 {
874         /*
875          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
876          * for the stylus.
877          */
878         if (field->physical == HID_DG_STYLUS)
879                 return 0;
880 
881         if (field->application == HID_DG_TOUCHSCREEN ||
882             field->application == HID_DG_TOUCHPAD)
883                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
884 
885         /* let hid-core decide for the others */
886         return 0;
887 }
888 
889 static int mt_event(struct hid_device *hid, struct hid_field *field,
890                                 struct hid_usage *usage, __s32 value)
891 {
892         struct mt_device *td = hid_get_drvdata(hid);
893 
894         if (field->report->id == td->mt_report_id)
895                 return mt_touch_event(hid, field, usage, value);
896 
897         return 0;
898 }
899 
900 static void mt_report(struct hid_device *hid, struct hid_report *report)
901 {
902         struct mt_device *td = hid_get_drvdata(hid);
903         struct hid_field *field = report->field[0];
904 
905         if (!(hid->claimed & HID_CLAIMED_INPUT))
906                 return;
907 
908         if (report->id == td->mt_report_id)
909                 return mt_touch_report(hid, report);
910 
911         if (field && field->hidinput && field->hidinput->input)
912                 input_sync(field->hidinput->input);
913 }
914 
915 static void mt_set_input_mode(struct hid_device *hdev)
916 {
917         struct mt_device *td = hid_get_drvdata(hdev);
918         struct hid_report *r;
919         struct hid_report_enum *re;
920         struct mt_class *cls = &td->mtclass;
921         char *buf;
922         int report_len;
923 
924         if (td->inputmode < 0)
925                 return;
926 
927         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
928         r = re->report_id_hash[td->inputmode];
929         if (r) {
930                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
931                         report_len = hid_report_len(r);
932                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
933                         if (!buf) {
934                                 hid_err(hdev, "failed to allocate buffer for report\n");
935                                 return;
936                         }
937                         hid_hw_raw_request(hdev, r->id, buf, report_len,
938                                            HID_FEATURE_REPORT,
939                                            HID_REQ_GET_REPORT);
940                         kfree(buf);
941                 }
942                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
943                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
944         }
945 }
946 
947 static void mt_set_maxcontacts(struct hid_device *hdev)
948 {
949         struct mt_device *td = hid_get_drvdata(hdev);
950         struct hid_report *r;
951         struct hid_report_enum *re;
952         int fieldmax, max;
953 
954         if (td->maxcontact_report_id < 0)
955                 return;
956 
957         if (!td->mtclass.maxcontacts)
958                 return;
959 
960         re = &hdev->report_enum[HID_FEATURE_REPORT];
961         r = re->report_id_hash[td->maxcontact_report_id];
962         if (r) {
963                 max = td->mtclass.maxcontacts;
964                 fieldmax = r->field[0]->logical_maximum;
965                 max = min(fieldmax, max);
966                 if (r->field[0]->value[0] != max) {
967                         r->field[0]->value[0] = max;
968                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
969                 }
970         }
971 }
972 
973 static void mt_post_parse_default_settings(struct mt_device *td)
974 {
975         __s32 quirks = td->mtclass.quirks;
976 
977         /* unknown serial device needs special quirks */
978         if (td->touches_by_report == 1) {
979                 quirks |= MT_QUIRK_ALWAYS_VALID;
980                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
981                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
982                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
983                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
984         }
985 
986         td->mtclass.quirks = quirks;
987 }
988 
989 static void mt_post_parse(struct mt_device *td)
990 {
991         struct mt_fields *f = td->fields;
992         struct mt_class *cls = &td->mtclass;
993 
994         if (td->touches_by_report > 0) {
995                 int field_count_per_touch = f->length / td->touches_by_report;
996                 td->last_slot_field = f->usages[field_count_per_touch - 1];
997         }
998 
999         if (td->cc_index < 0)
1000                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1001 }
1002 
1003 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
1004 {
1005         struct mt_device *td = hid_get_drvdata(hdev);
1006         char *name;
1007         const char *suffix = NULL;
1008         struct hid_field *field = hi->report->field[0];
1009         int ret;
1010 
1011         if (hi->report->id == td->mt_report_id) {
1012                 ret = mt_touch_input_configured(hdev, hi);
1013                 if (ret)
1014                         return ret;
1015         }
1016 
1017         /*
1018          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
1019          * for the stylus. Check this first, and then rely on the application
1020          * field.
1021          */
1022         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
1023                 suffix = "Pen";
1024                 /* force BTN_STYLUS to allow tablet matching in udev */
1025                 __set_bit(BTN_STYLUS, hi->input->keybit);
1026         } else {
1027                 switch (field->application) {
1028                 case HID_GD_KEYBOARD:
1029                         suffix = "Keyboard";
1030                         break;
1031                 case HID_GD_KEYPAD:
1032                         suffix = "Keypad";
1033                         break;
1034                 case HID_GD_MOUSE:
1035                         suffix = "Mouse";
1036                         break;
1037                 case HID_DG_STYLUS:
1038                         suffix = "Pen";
1039                         /* force BTN_STYLUS to allow tablet matching in udev */
1040                         __set_bit(BTN_STYLUS, hi->input->keybit);
1041                         break;
1042                 case HID_DG_TOUCHSCREEN:
1043                         /* we do not set suffix = "Touchscreen" */
1044                         break;
1045                 case HID_DG_TOUCHPAD:
1046                         suffix = "Touchpad";
1047                         break;
1048                 case HID_GD_SYSTEM_CONTROL:
1049                         suffix = "System Control";
1050                         break;
1051                 case HID_CP_CONSUMER_CONTROL:
1052                         suffix = "Consumer Control";
1053                         break;
1054                 default:
1055                         suffix = "UNKNOWN";
1056                         break;
1057                 }
1058         }
1059 
1060         if (suffix) {
1061                 name = devm_kzalloc(&hi->input->dev,
1062                                     strlen(hdev->name) + strlen(suffix) + 2,
1063                                     GFP_KERNEL);
1064                 if (name) {
1065                         sprintf(name, "%s %s", hdev->name, suffix);
1066                         hi->input->name = name;
1067                 }
1068         }
1069 
1070         return 0;
1071 }
1072 
1073 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1074 {
1075         int ret, i;
1076         struct mt_device *td;
1077         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1078 
1079         for (i = 0; mt_classes[i].name ; i++) {
1080                 if (id->driver_data == mt_classes[i].name) {
1081                         mtclass = &(mt_classes[i]);
1082                         break;
1083                 }
1084         }
1085 
1086         /* This allows the driver to correctly support devices
1087          * that emit events over several HID messages.
1088          */
1089         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1090 
1091         /*
1092          * This allows the driver to handle different input sensors
1093          * that emits events through different reports on the same HID
1094          * device.
1095          */
1096         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1097         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1098 
1099         /*
1100          * Handle special quirks for Windows 8 certified devices.
1101          */
1102         if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
1103                 /*
1104                  * Some multitouch screens do not like to be polled for input
1105                  * reports. Fortunately, the Win8 spec says that all touches
1106                  * should be sent during each report, making the initialization
1107                  * of input reports unnecessary.
1108                  *
1109                  * In addition some touchpads do not behave well if we read
1110                  * all feature reports from them. Instead we prevent
1111                  * initial report fetching and then selectively fetch each
1112                  * report we are interested in.
1113                  */
1114                 hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1115 
1116         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1117         if (!td) {
1118                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1119                 return -ENOMEM;
1120         }
1121         td->mtclass = *mtclass;
1122         td->inputmode = -1;
1123         td->maxcontact_report_id = -1;
1124         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1125         td->cc_index = -1;
1126         td->mt_report_id = -1;
1127         hid_set_drvdata(hdev, td);
1128 
1129         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1130                                   GFP_KERNEL);
1131         if (!td->fields) {
1132                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1133                 return -ENOMEM;
1134         }
1135 
1136         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1137                 td->serial_maybe = true;
1138 
1139         ret = hid_parse(hdev);
1140         if (ret != 0)
1141                 return ret;
1142 
1143         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1144         if (ret)
1145                 return ret;
1146 
1147         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1148         if (ret)
1149                 dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
1150                                 hdev->name);
1151 
1152         mt_set_maxcontacts(hdev);
1153         mt_set_input_mode(hdev);
1154 
1155         /* release .fields memory as it is not used anymore */
1156         devm_kfree(&hdev->dev, td->fields);
1157         td->fields = NULL;
1158 
1159         return 0;
1160 }
1161 
1162 #ifdef CONFIG_PM
1163 static void mt_release_contacts(struct hid_device *hid)
1164 {
1165         struct hid_input *hidinput;
1166 
1167         list_for_each_entry(hidinput, &hid->inputs, list) {
1168                 struct input_dev *input_dev = hidinput->input;
1169                 struct input_mt *mt = input_dev->mt;
1170                 int i;
1171 
1172                 if (mt) {
1173                         for (i = 0; i < mt->num_slots; i++) {
1174                                 input_mt_slot(input_dev, i);
1175                                 input_mt_report_slot_state(input_dev,
1176                                                            MT_TOOL_FINGER,
1177                                                            false);
1178                         }
1179                         input_mt_sync_frame(input_dev);
1180                         input_sync(input_dev);
1181                 }
1182         }
1183 }
1184 
1185 static int mt_reset_resume(struct hid_device *hdev)
1186 {
1187         mt_release_contacts(hdev);
1188         mt_set_maxcontacts(hdev);
1189         mt_set_input_mode(hdev);
1190         return 0;
1191 }
1192 
1193 static int mt_resume(struct hid_device *hdev)
1194 {
1195         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1196          * It should be safe to send it to other devices too.
1197          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1198 
1199         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1200 
1201         return 0;
1202 }
1203 #endif
1204 
1205 static void mt_remove(struct hid_device *hdev)
1206 {
1207         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1208         hid_hw_stop(hdev);
1209 }
1210 
1211 /*
1212  * This list contains only:
1213  * - VID/PID of products not working with the default multitouch handling
1214  * - 2 generic rules.
1215  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1216  */
1217 static const struct hid_device_id mt_devices[] = {
1218 
1219         /* 3M panels */
1220         { .driver_data = MT_CLS_3M,
1221                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1222                         USB_DEVICE_ID_3M1968) },
1223         { .driver_data = MT_CLS_3M,
1224                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1225                         USB_DEVICE_ID_3M2256) },
1226         { .driver_data = MT_CLS_3M,
1227                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1228                         USB_DEVICE_ID_3M3266) },
1229 
1230         /* Anton devices */
1231         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1232                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1233                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1234 
1235         /* Atmel panels */
1236         { .driver_data = MT_CLS_SERIAL,
1237                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1238                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1239 
1240         /* Baanto multitouch devices */
1241         { .driver_data = MT_CLS_NSMU,
1242                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1243                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1244 
1245         /* Cando panels */
1246         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1247                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1248                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1249         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1250                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1251                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1252 
1253         /* Chunghwa Telecom touch panels */
1254         {  .driver_data = MT_CLS_NSMU,
1255                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1256                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1257 
1258         /* CJTouch panels */
1259         { .driver_data = MT_CLS_NSMU,
1260                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1261                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1262         { .driver_data = MT_CLS_NSMU,
1263                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1264                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1265 
1266         /* CVTouch panels */
1267         { .driver_data = MT_CLS_NSMU,
1268                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1269                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1270 
1271         /* eGalax devices (resistive) */
1272         { .driver_data = MT_CLS_EGALAX,
1273                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1274                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1275         { .driver_data = MT_CLS_EGALAX,
1276                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1277                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1278 
1279         /* eGalax devices (capacitive) */
1280         { .driver_data = MT_CLS_EGALAX_SERIAL,
1281                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1282                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1283         { .driver_data = MT_CLS_EGALAX,
1284                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1285                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1286         { .driver_data = MT_CLS_EGALAX_SERIAL,
1287                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1288                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1289         { .driver_data = MT_CLS_EGALAX_SERIAL,
1290                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1291                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1292         { .driver_data = MT_CLS_EGALAX_SERIAL,
1293                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1294                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1295         { .driver_data = MT_CLS_EGALAX_SERIAL,
1296                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1297                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1298         { .driver_data = MT_CLS_EGALAX,
1299                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1300                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1301         { .driver_data = MT_CLS_EGALAX,
1302                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1303                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1304         { .driver_data = MT_CLS_EGALAX_SERIAL,
1305                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1306                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1307         { .driver_data = MT_CLS_EGALAX,
1308                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1309                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1310         { .driver_data = MT_CLS_EGALAX,
1311                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1312                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1313         { .driver_data = MT_CLS_EGALAX,
1314                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1315                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1316         { .driver_data = MT_CLS_EGALAX,
1317                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1318                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1319         { .driver_data = MT_CLS_EGALAX_SERIAL,
1320                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1321                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1322         { .driver_data = MT_CLS_EGALAX_SERIAL,
1323                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1324                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1325         { .driver_data = MT_CLS_EGALAX_SERIAL,
1326                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1327                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1328 
1329         /* Elitegroup panel */
1330         { .driver_data = MT_CLS_SERIAL,
1331                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1332                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1333 
1334         /* Flatfrog Panels */
1335         { .driver_data = MT_CLS_FLATFROG,
1336                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1337                         USB_DEVICE_ID_MULTITOUCH_3200) },
1338 
1339         /* FocalTech Panels */
1340         { .driver_data = MT_CLS_SERIAL,
1341                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1342                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1343 
1344         /* GeneralTouch panel */
1345         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1346                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1347                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1348         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1349                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1350                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1351         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1352                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1353                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1354         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1355                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1356                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1357         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1358                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1359                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1360         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1361                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1362                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1363         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1364                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1365                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1366 
1367         /* Gametel game controller */
1368         { .driver_data = MT_CLS_NSMU,
1369                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1370                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1371 
1372         /* GoodTouch panels */
1373         { .driver_data = MT_CLS_NSMU,
1374                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1375                         USB_DEVICE_ID_GOODTOUCH_000f) },
1376 
1377         /* Hanvon panels */
1378         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1379                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1380                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1381 
1382         /* Ilitek dual touch panel */
1383         {  .driver_data = MT_CLS_NSMU,
1384                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1385                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1386 
1387         /* MosArt panels */
1388         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1389                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1390                         USB_DEVICE_ID_ASUS_T91MT)},
1391         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1392                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1393                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1394         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1395                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1396                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1397 
1398         /* Panasonic panels */
1399         { .driver_data = MT_CLS_PANASONIC,
1400                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1401                         USB_DEVICE_ID_PANABOARD_UBT780) },
1402         { .driver_data = MT_CLS_PANASONIC,
1403                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1404                         USB_DEVICE_ID_PANABOARD_UBT880) },
1405 
1406         /* Novatek Panel */
1407         { .driver_data = MT_CLS_NSMU,
1408                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1409                         USB_DEVICE_ID_NOVATEK_PCT) },
1410 
1411         /* Ntrig Panel */
1412         { .driver_data = MT_CLS_NSMU,
1413                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1414                         USB_VENDOR_ID_NTRIG, 0x1b05) },
1415 
1416         /* PixArt optical touch screen */
1417         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1418                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1419                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1420         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1421                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1422                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1423         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1424                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1425                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1426 
1427         /* PixCir-based panels */
1428         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1429                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1430                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1431 
1432         /* Quanta-based panels */
1433         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1434                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1435                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1436 
1437         /* Stantum panels */
1438         { .driver_data = MT_CLS_CONFIDENCE,
1439                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1440                         USB_DEVICE_ID_MTP_STM)},
1441 
1442         /* TopSeed panels */
1443         { .driver_data = MT_CLS_TOPSEED,
1444                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1445                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1446 
1447         /* Touch International panels */
1448         { .driver_data = MT_CLS_NSMU,
1449                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1450                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1451 
1452         /* Unitec panels */
1453         { .driver_data = MT_CLS_NSMU,
1454                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1455                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1456         { .driver_data = MT_CLS_NSMU,
1457                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1458                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1459 
1460         /* VTL panels */
1461         { .driver_data = MT_CLS_VTL,
1462                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1463                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1464 
1465         /* Wistron panels */
1466         { .driver_data = MT_CLS_NSMU,
1467                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1468                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1469 
1470         /* XAT */
1471         { .driver_data = MT_CLS_NSMU,
1472                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1473                         USB_DEVICE_ID_XAT_CSR) },
1474 
1475         /* Xiroku */
1476         { .driver_data = MT_CLS_NSMU,
1477                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1478                         USB_DEVICE_ID_XIROKU_SPX) },
1479         { .driver_data = MT_CLS_NSMU,
1480                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1481                         USB_DEVICE_ID_XIROKU_MPX) },
1482         { .driver_data = MT_CLS_NSMU,
1483                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1484                         USB_DEVICE_ID_XIROKU_CSR) },
1485         { .driver_data = MT_CLS_NSMU,
1486                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1487                         USB_DEVICE_ID_XIROKU_SPX1) },
1488         { .driver_data = MT_CLS_NSMU,
1489                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1490                         USB_DEVICE_ID_XIROKU_MPX1) },
1491         { .driver_data = MT_CLS_NSMU,
1492                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1493                         USB_DEVICE_ID_XIROKU_CSR1) },
1494         { .driver_data = MT_CLS_NSMU,
1495                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1496                         USB_DEVICE_ID_XIROKU_SPX2) },
1497         { .driver_data = MT_CLS_NSMU,
1498                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1499                         USB_DEVICE_ID_XIROKU_MPX2) },
1500         { .driver_data = MT_CLS_NSMU,
1501                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1502                         USB_DEVICE_ID_XIROKU_CSR2) },
1503 
1504         /* Generic MT device */
1505         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1506 
1507         /* Generic Win 8 certified MT device */
1508         {  .driver_data = MT_CLS_WIN_8,
1509                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1510                         HID_ANY_ID, HID_ANY_ID) },
1511         { }
1512 };
1513 MODULE_DEVICE_TABLE(hid, mt_devices);
1514 
1515 static const struct hid_usage_id mt_grabbed_usages[] = {
1516         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1517         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1518 };
1519 
1520 static struct hid_driver mt_driver = {
1521         .name = "hid-multitouch",
1522         .id_table = mt_devices,
1523         .probe = mt_probe,
1524         .remove = mt_remove,
1525         .input_mapping = mt_input_mapping,
1526         .input_mapped = mt_input_mapped,
1527         .input_configured = mt_input_configured,
1528         .feature_mapping = mt_feature_mapping,
1529         .usage_table = mt_grabbed_usages,
1530         .event = mt_event,
1531         .report = mt_report,
1532 #ifdef CONFIG_PM
1533         .reset_resume = mt_reset_resume,
1534         .resume = mt_resume,
1535 #endif
1536 };
1537 module_hid_driver(mt_driver);
1538 

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