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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         unsigned long initial_quirks;   /* initial quirks state */
112         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
113         __s16 inputmode_index;  /* InputMode HID feature index in the report */
114         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
115                                    -1 if non-existent */
116         __u8 inputmode_value;  /* InputMode HID feature value */
117         __u8 num_received;      /* how many contacts we received */
118         __u8 num_expected;      /* expected last contact index */
119         __u8 maxcontacts;
120         __u8 touches_by_report; /* how many touches are present in one report:
121                                 * 1 means we should use a serial protocol
122                                 * > 1 means hybrid (multitouch) protocol */
123         __u8 buttons_count;     /* number of physical buttons per touchpad */
124         bool is_buttonpad;      /* is this device a button pad? */
125         bool serial_maybe;      /* need to check for serial protocol */
126         bool curvalid;          /* is the current contact valid? */
127         unsigned mt_flags;      /* flags to pass to input-mt */
128 };
129 
130 static void mt_post_parse_default_settings(struct mt_device *td);
131 static void mt_post_parse(struct mt_device *td);
132 
133 /* classes of device behavior */
134 #define MT_CLS_DEFAULT                          0x0001
135 
136 #define MT_CLS_SERIAL                           0x0002
137 #define MT_CLS_CONFIDENCE                       0x0003
138 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
139 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
140 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
141 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
142 /* reserved                                     0x0008 */
143 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
144 #define MT_CLS_NSMU                             0x000a
145 /* reserved                                     0x0010 */
146 /* reserved                                     0x0011 */
147 #define MT_CLS_WIN_8                            0x0012
148 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
149 
150 /* vendor specific classes */
151 #define MT_CLS_3M                               0x0101
152 /* reserved                                     0x0102 */
153 #define MT_CLS_EGALAX                           0x0103
154 #define MT_CLS_EGALAX_SERIAL                    0x0104
155 #define MT_CLS_TOPSEED                          0x0105
156 #define MT_CLS_PANASONIC                        0x0106
157 #define MT_CLS_FLATFROG                         0x0107
158 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
159 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
160 #define MT_CLS_VTL                              0x0110
161 
162 #define MT_DEFAULT_MAXCONTACT   10
163 #define MT_MAX_MAXCONTACT       250
164 
165 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
166 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
167 
168 /*
169  * these device-dependent functions determine what slot corresponds
170  * to a valid contact that was just read.
171  */
172 
173 static int cypress_compute_slot(struct mt_device *td)
174 {
175         if (td->curdata.contactid != 0 || td->num_received == 0)
176                 return td->curdata.contactid;
177         else
178                 return -1;
179 }
180 
181 static struct mt_class mt_classes[] = {
182         { .name = MT_CLS_DEFAULT,
183                 .quirks = MT_QUIRK_ALWAYS_VALID |
184                         MT_QUIRK_CONTACT_CNT_ACCURATE },
185         { .name = MT_CLS_NSMU,
186                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
187         { .name = MT_CLS_SERIAL,
188                 .quirks = MT_QUIRK_ALWAYS_VALID},
189         { .name = MT_CLS_CONFIDENCE,
190                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
191         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
192                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
193                         MT_QUIRK_SLOT_IS_CONTACTID },
194         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
195                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
196                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
197         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
198                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
199                         MT_QUIRK_SLOT_IS_CONTACTID,
200                 .maxcontacts = 2 },
201         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
202                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
203                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
204                 .maxcontacts = 2 },
205         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
206                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
207                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
208         { .name = MT_CLS_WIN_8,
209                 .quirks = MT_QUIRK_ALWAYS_VALID |
210                         MT_QUIRK_IGNORE_DUPLICATES |
211                         MT_QUIRK_HOVERING |
212                         MT_QUIRK_CONTACT_CNT_ACCURATE },
213         { .name = MT_CLS_EXPORT_ALL_INPUTS,
214                 .quirks = MT_QUIRK_ALWAYS_VALID |
215                         MT_QUIRK_CONTACT_CNT_ACCURATE,
216                 .export_all_inputs = true },
217 
218         /*
219          * vendor specific classes
220          */
221         { .name = MT_CLS_3M,
222                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
223                         MT_QUIRK_SLOT_IS_CONTACTID,
224                 .sn_move = 2048,
225                 .sn_width = 128,
226                 .sn_height = 128,
227                 .maxcontacts = 60,
228         },
229         { .name = MT_CLS_EGALAX,
230                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
231                         MT_QUIRK_VALID_IS_INRANGE,
232                 .sn_move = 4096,
233                 .sn_pressure = 32,
234         },
235         { .name = MT_CLS_EGALAX_SERIAL,
236                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
237                         MT_QUIRK_ALWAYS_VALID,
238                 .sn_move = 4096,
239                 .sn_pressure = 32,
240         },
241         { .name = MT_CLS_TOPSEED,
242                 .quirks = MT_QUIRK_ALWAYS_VALID,
243                 .is_indirect = true,
244                 .maxcontacts = 2,
245         },
246         { .name = MT_CLS_PANASONIC,
247                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
248                 .maxcontacts = 4 },
249         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
250                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
251                         MT_QUIRK_VALID_IS_INRANGE |
252                         MT_QUIRK_SLOT_IS_CONTACTID,
253                 .maxcontacts = 2
254         },
255         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
256                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
257                         MT_QUIRK_SLOT_IS_CONTACTID
258         },
259 
260         { .name = MT_CLS_FLATFROG,
261                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
262                         MT_QUIRK_NO_AREA,
263                 .sn_move = 2048,
264                 .maxcontacts = 40,
265         },
266         { .name = MT_CLS_VTL,
267                 .quirks = MT_QUIRK_ALWAYS_VALID |
268                         MT_QUIRK_CONTACT_CNT_ACCURATE |
269                         MT_QUIRK_FORCE_GET_FEATURE,
270         },
271         { }
272 };
273 
274 static ssize_t mt_show_quirks(struct device *dev,
275                            struct device_attribute *attr,
276                            char *buf)
277 {
278         struct hid_device *hdev = to_hid_device(dev);
279         struct mt_device *td = hid_get_drvdata(hdev);
280 
281         return sprintf(buf, "%u\n", td->mtclass.quirks);
282 }
283 
284 static ssize_t mt_set_quirks(struct device *dev,
285                           struct device_attribute *attr,
286                           const char *buf, size_t count)
287 {
288         struct hid_device *hdev = to_hid_device(dev);
289         struct mt_device *td = hid_get_drvdata(hdev);
290 
291         unsigned long val;
292 
293         if (kstrtoul(buf, 0, &val))
294                 return -EINVAL;
295 
296         td->mtclass.quirks = val;
297 
298         if (td->cc_index < 0)
299                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
300 
301         return count;
302 }
303 
304 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
305 
306 static struct attribute *sysfs_attrs[] = {
307         &dev_attr_quirks.attr,
308         NULL
309 };
310 
311 static struct attribute_group mt_attribute_group = {
312         .attrs = sysfs_attrs
313 };
314 
315 static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
316 {
317         struct mt_device *td = hid_get_drvdata(hdev);
318         int ret, size = hid_report_len(report);
319         u8 *buf;
320 
321         /*
322          * Do not fetch the feature report if the device has been explicitly
323          * marked as non-capable.
324          */
325         if (td->initial_quirks & HID_QUIRK_NO_INIT_REPORTS)
326                 return;
327 
328         buf = hid_alloc_report_buf(report, GFP_KERNEL);
329         if (!buf)
330                 return;
331 
332         ret = hid_hw_raw_request(hdev, report->id, buf, size,
333                                  HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
334         if (ret < 0) {
335                 dev_warn(&hdev->dev, "failed to fetch feature %d\n",
336                          report->id);
337         } else {
338                 ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
339                                            size, 0);
340                 if (ret)
341                         dev_warn(&hdev->dev, "failed to report feature\n");
342         }
343 
344         kfree(buf);
345 }
346 
347 static void mt_feature_mapping(struct hid_device *hdev,
348                 struct hid_field *field, struct hid_usage *usage)
349 {
350         struct mt_device *td = hid_get_drvdata(hdev);
351 
352         switch (usage->hid) {
353         case HID_DG_INPUTMODE:
354                 /* Ignore if value index is out of bounds. */
355                 if (usage->usage_index >= field->report_count) {
356                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
357                         break;
358                 }
359 
360                 if (td->inputmode < 0) {
361                         td->inputmode = field->report->id;
362                         td->inputmode_index = usage->usage_index;
363                 } else {
364                         /*
365                          * Some elan panels wrongly declare 2 input mode
366                          * features, and silently ignore when we set the
367                          * value in the second field. Skip the second feature
368                          * and hope for the best.
369                          */
370                         dev_info(&hdev->dev,
371                                  "Ignoring the extra HID_DG_INPUTMODE\n");
372                 }
373 
374                 break;
375         case HID_DG_CONTACTMAX:
376                 mt_get_feature(hdev, field->report);
377 
378                 td->maxcontact_report_id = field->report->id;
379                 td->maxcontacts = field->value[0];
380                 if (!td->maxcontacts &&
381                     field->logical_maximum <= MT_MAX_MAXCONTACT)
382                         td->maxcontacts = field->logical_maximum;
383                 if (td->mtclass.maxcontacts)
384                         /* check if the maxcontacts is given by the class */
385                         td->maxcontacts = td->mtclass.maxcontacts;
386 
387                 break;
388         case HID_DG_BUTTONTYPE:
389                 if (usage->usage_index >= field->report_count) {
390                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
391                         break;
392                 }
393 
394                 mt_get_feature(hdev, field->report);
395                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
396                         td->is_buttonpad = true;
397 
398                 break;
399         case 0xff0000c5:
400                 /* Retrieve the Win8 blob once to enable some devices */
401                 if (usage->usage_index == 0)
402                         mt_get_feature(hdev, field->report);
403                 break;
404         }
405 }
406 
407 static void set_abs(struct input_dev *input, unsigned int code,
408                 struct hid_field *field, int snratio)
409 {
410         int fmin = field->logical_minimum;
411         int fmax = field->logical_maximum;
412         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
413         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
414         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
415 }
416 
417 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
418                 struct hid_input *hi)
419 {
420         struct mt_fields *f = td->fields;
421 
422         if (f->length >= HID_MAX_FIELDS)
423                 return;
424 
425         f->usages[f->length++] = usage->hid;
426 }
427 
428 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
429                 struct hid_field *field, struct hid_usage *usage,
430                 unsigned long **bit, int *max)
431 {
432         struct mt_device *td = hid_get_drvdata(hdev);
433         struct mt_class *cls = &td->mtclass;
434         int code;
435         struct hid_usage *prev_usage = NULL;
436 
437         if (field->application == HID_DG_TOUCHSCREEN)
438                 td->mt_flags |= INPUT_MT_DIRECT;
439 
440         /*
441          * Model touchscreens providing buttons as touchpads.
442          */
443         if (field->application == HID_DG_TOUCHPAD ||
444             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
445                 td->mt_flags |= INPUT_MT_POINTER;
446                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
447         }
448 
449         /* count the buttons on touchpads */
450         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
451                 td->buttons_count++;
452 
453         if (usage->usage_index)
454                 prev_usage = &field->usage[usage->usage_index - 1];
455 
456         switch (usage->hid & HID_USAGE_PAGE) {
457 
458         case HID_UP_GENDESK:
459                 switch (usage->hid) {
460                 case HID_GD_X:
461                         if (prev_usage && (prev_usage->hid == usage->hid)) {
462                                 hid_map_usage(hi, usage, bit, max,
463                                         EV_ABS, ABS_MT_TOOL_X);
464                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
465                                         cls->sn_move);
466                         } else {
467                                 hid_map_usage(hi, usage, bit, max,
468                                         EV_ABS, ABS_MT_POSITION_X);
469                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
470                                         cls->sn_move);
471                         }
472 
473                         mt_store_field(usage, td, hi);
474                         return 1;
475                 case HID_GD_Y:
476                         if (prev_usage && (prev_usage->hid == usage->hid)) {
477                                 hid_map_usage(hi, usage, bit, max,
478                                         EV_ABS, ABS_MT_TOOL_Y);
479                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
480                                         cls->sn_move);
481                         } else {
482                                 hid_map_usage(hi, usage, bit, max,
483                                         EV_ABS, ABS_MT_POSITION_Y);
484                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
485                                         cls->sn_move);
486                         }
487 
488                         mt_store_field(usage, td, hi);
489                         return 1;
490                 }
491                 return 0;
492 
493         case HID_UP_DIGITIZER:
494                 switch (usage->hid) {
495                 case HID_DG_INRANGE:
496                         if (cls->quirks & MT_QUIRK_HOVERING) {
497                                 hid_map_usage(hi, usage, bit, max,
498                                         EV_ABS, ABS_MT_DISTANCE);
499                                 input_set_abs_params(hi->input,
500                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
501                         }
502                         mt_store_field(usage, td, hi);
503                         return 1;
504                 case HID_DG_CONFIDENCE:
505                         if (cls->name == MT_CLS_WIN_8 &&
506                                 field->application == HID_DG_TOUCHPAD)
507                                 cls->quirks |= MT_QUIRK_CONFIDENCE;
508                         mt_store_field(usage, td, hi);
509                         return 1;
510                 case HID_DG_TIPSWITCH:
511                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
512                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
513                         mt_store_field(usage, td, hi);
514                         return 1;
515                 case HID_DG_CONTACTID:
516                         mt_store_field(usage, td, hi);
517                         td->touches_by_report++;
518                         td->mt_report_id = field->report->id;
519                         return 1;
520                 case HID_DG_WIDTH:
521                         hid_map_usage(hi, usage, bit, max,
522                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
523                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
524                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
525                                         cls->sn_width);
526                         mt_store_field(usage, td, hi);
527                         return 1;
528                 case HID_DG_HEIGHT:
529                         hid_map_usage(hi, usage, bit, max,
530                                         EV_ABS, ABS_MT_TOUCH_MINOR);
531                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
532                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
533                                         cls->sn_height);
534                                 input_set_abs_params(hi->input,
535                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
536                         }
537                         mt_store_field(usage, td, hi);
538                         return 1;
539                 case HID_DG_TIPPRESSURE:
540                         hid_map_usage(hi, usage, bit, max,
541                                         EV_ABS, ABS_MT_PRESSURE);
542                         set_abs(hi->input, ABS_MT_PRESSURE, field,
543                                 cls->sn_pressure);
544                         mt_store_field(usage, td, hi);
545                         return 1;
546                 case HID_DG_CONTACTCOUNT:
547                         /* Ignore if indexes are out of bounds. */
548                         if (field->index >= field->report->maxfield ||
549                             usage->usage_index >= field->report_count)
550                                 return 1;
551                         td->cc_index = field->index;
552                         td->cc_value_index = usage->usage_index;
553                         return 1;
554                 case HID_DG_CONTACTMAX:
555                         /* we don't set td->last_slot_field as contactcount and
556                          * contact max are global to the report */
557                         return -1;
558                 case HID_DG_TOUCH:
559                         /* Legacy devices use TIPSWITCH and not TOUCH.
560                          * Let's just ignore this field. */
561                         return -1;
562                 }
563                 /* let hid-input decide for the others */
564                 return 0;
565 
566         case HID_UP_BUTTON:
567                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
568                 /*
569                  * MS PTP spec says that external buttons left and right have
570                  * usages 2 and 3.
571                  */
572                 if (cls->name == MT_CLS_WIN_8 &&
573                     field->application == HID_DG_TOUCHPAD &&
574                     (usage->hid & HID_USAGE) > 1)
575                         code--;
576                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
577                 input_set_capability(hi->input, EV_KEY, code);
578                 return 1;
579 
580         case 0xff000000:
581                 /* we do not want to map these: no input-oriented meaning */
582                 return -1;
583         }
584 
585         return 0;
586 }
587 
588 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
589                 struct hid_field *field, struct hid_usage *usage,
590                 unsigned long **bit, int *max)
591 {
592         if (usage->type == EV_KEY || usage->type == EV_ABS)
593                 set_bit(usage->type, hi->input->evbit);
594 
595         return -1;
596 }
597 
598 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
599 {
600         __s32 quirks = td->mtclass.quirks;
601 
602         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
603                 return td->curdata.contactid;
604 
605         if (quirks & MT_QUIRK_CYPRESS)
606                 return cypress_compute_slot(td);
607 
608         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
609                 return td->num_received;
610 
611         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
612                 return td->curdata.contactid - 1;
613 
614         return input_mt_get_slot_by_key(input, td->curdata.contactid);
615 }
616 
617 /*
618  * this function is called when a whole contact has been processed,
619  * so that it can assign it to a slot and store the data there
620  */
621 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
622 {
623         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
624             td->num_received >= td->num_expected)
625                 return;
626 
627         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
628                 int active;
629                 int slotnum = mt_compute_slot(td, input);
630                 struct mt_slot *s = &td->curdata;
631                 struct input_mt *mt = input->mt;
632 
633                 if (slotnum < 0 || slotnum >= td->maxcontacts)
634                         return;
635 
636                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
637                         struct input_mt_slot *slot = &mt->slots[slotnum];
638                         if (input_mt_is_active(slot) &&
639                             input_mt_is_used(mt, slot))
640                                 return;
641                 }
642 
643                 if (!(td->mtclass.quirks & MT_QUIRK_CONFIDENCE))
644                         s->confidence_state = 1;
645                 active = (s->touch_state || s->inrange_state) &&
646                                                         s->confidence_state;
647 
648                 input_mt_slot(input, slotnum);
649                 input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
650                 if (active) {
651                         /* this finger is in proximity of the sensor */
652                         int wide = (s->w > s->h);
653                         /* divided by two to match visual scale of touch */
654                         int major = max(s->w, s->h) >> 1;
655                         int minor = min(s->w, s->h) >> 1;
656 
657                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
658                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
659                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
660                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
661                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
662                                 !s->touch_state);
663                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
664                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
665                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
666                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
667                 }
668         }
669 
670         td->num_received++;
671 }
672 
673 /*
674  * this function is called when a whole packet has been received and processed,
675  * so that it can decide what to send to the input layer.
676  */
677 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
678 {
679         input_mt_sync_frame(input);
680         input_sync(input);
681         td->num_received = 0;
682 }
683 
684 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
685                                 struct hid_usage *usage, __s32 value)
686 {
687         /* we will handle the hidinput part later, now remains hiddev */
688         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
689                 hid->hiddev_hid_event(hid, field, usage, value);
690 
691         return 1;
692 }
693 
694 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
695                                 struct hid_usage *usage, __s32 value)
696 {
697         struct mt_device *td = hid_get_drvdata(hid);
698         __s32 quirks = td->mtclass.quirks;
699         struct input_dev *input = field->hidinput->input;
700 
701         if (hid->claimed & HID_CLAIMED_INPUT) {
702                 switch (usage->hid) {
703                 case HID_DG_INRANGE:
704                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
705                                 td->curvalid = value;
706                         if (quirks & MT_QUIRK_HOVERING)
707                                 td->curdata.inrange_state = value;
708                         break;
709                 case HID_DG_TIPSWITCH:
710                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
711                                 td->curvalid = value;
712                         td->curdata.touch_state = value;
713                         break;
714                 case HID_DG_CONFIDENCE:
715                         if (quirks & MT_QUIRK_CONFIDENCE)
716                                 td->curdata.confidence_state = value;
717                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
718                                 td->curvalid = value;
719                         break;
720                 case HID_DG_CONTACTID:
721                         td->curdata.contactid = value;
722                         break;
723                 case HID_DG_TIPPRESSURE:
724                         td->curdata.p = value;
725                         break;
726                 case HID_GD_X:
727                         if (usage->code == ABS_MT_TOOL_X)
728                                 td->curdata.cx = value;
729                         else
730                                 td->curdata.x = value;
731                         break;
732                 case HID_GD_Y:
733                         if (usage->code == ABS_MT_TOOL_Y)
734                                 td->curdata.cy = value;
735                         else
736                                 td->curdata.y = value;
737                         break;
738                 case HID_DG_WIDTH:
739                         td->curdata.w = value;
740                         break;
741                 case HID_DG_HEIGHT:
742                         td->curdata.h = value;
743                         break;
744                 case HID_DG_CONTACTCOUNT:
745                         break;
746                 case HID_DG_TOUCH:
747                         /* do nothing */
748                         break;
749 
750                 default:
751                         if (usage->type)
752                                 input_event(input, usage->type, usage->code,
753                                                 value);
754                         return;
755                 }
756 
757                 if (usage->usage_index + 1 == field->report_count) {
758                         /* we only take into account the last report. */
759                         if (usage->hid == td->last_slot_field)
760                                 mt_complete_slot(td, field->hidinput->input);
761                 }
762 
763         }
764 }
765 
766 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
767 {
768         struct mt_device *td = hid_get_drvdata(hid);
769         struct hid_field *field;
770         unsigned count;
771         int r, n;
772 
773         /*
774          * Includes multi-packet support where subsequent
775          * packets are sent with zero contactcount.
776          */
777         if (td->cc_index >= 0) {
778                 struct hid_field *field = report->field[td->cc_index];
779                 int value = field->value[td->cc_value_index];
780                 if (value)
781                         td->num_expected = value;
782         }
783 
784         for (r = 0; r < report->maxfield; r++) {
785                 field = report->field[r];
786                 count = field->report_count;
787 
788                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
789                         continue;
790 
791                 for (n = 0; n < count; n++)
792                         mt_process_mt_event(hid, field, &field->usage[n],
793                                         field->value[n]);
794         }
795 
796         if (td->num_received >= td->num_expected)
797                 mt_sync_frame(td, report->field[0]->hidinput->input);
798 }
799 
800 static int mt_touch_input_configured(struct hid_device *hdev,
801                                         struct hid_input *hi)
802 {
803         struct mt_device *td = hid_get_drvdata(hdev);
804         struct mt_class *cls = &td->mtclass;
805         struct input_dev *input = hi->input;
806         int ret;
807 
808         if (!td->maxcontacts)
809                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
810 
811         mt_post_parse(td);
812         if (td->serial_maybe)
813                 mt_post_parse_default_settings(td);
814 
815         if (cls->is_indirect)
816                 td->mt_flags |= INPUT_MT_POINTER;
817 
818         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
819                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
820 
821         /* check for clickpads */
822         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
823                 td->is_buttonpad = true;
824 
825         if (td->is_buttonpad)
826                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
827 
828         ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
829         if (ret)
830                 return ret;
831 
832         td->mt_flags = 0;
833         return 0;
834 }
835 
836 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
837                 struct hid_field *field, struct hid_usage *usage,
838                 unsigned long **bit, int *max)
839 {
840         struct mt_device *td = hid_get_drvdata(hdev);
841 
842         /*
843          * If mtclass.export_all_inputs is not set, only map fields from
844          * TouchScreen or TouchPad collections. We need to ignore fields
845          * that belong to other collections such as Mouse that might have
846          * the same GenericDesktop usages.
847          */
848         if (!td->mtclass.export_all_inputs &&
849             field->application != HID_DG_TOUCHSCREEN &&
850             field->application != HID_DG_PEN &&
851             field->application != HID_DG_TOUCHPAD &&
852             field->application != HID_GD_KEYBOARD &&
853             field->application != HID_CP_CONSUMER_CONTROL)
854                 return -1;
855 
856         /*
857          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
858          * for the stylus.
859          * The check for mt_report_id ensures we don't process
860          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
861          * collection, but within the report ID.
862          */
863         if (field->physical == HID_DG_STYLUS)
864                 return 0;
865         else if ((field->physical == 0) &&
866                  (field->report->id != td->mt_report_id) &&
867                  (td->mt_report_id != -1))
868                 return 0;
869 
870         if (field->application == HID_DG_TOUCHSCREEN ||
871             field->application == HID_DG_TOUCHPAD)
872                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
873 
874         /* let hid-core decide for the others */
875         return 0;
876 }
877 
878 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
879                 struct hid_field *field, struct hid_usage *usage,
880                 unsigned long **bit, int *max)
881 {
882         /*
883          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
884          * for the stylus.
885          */
886         if (field->physical == HID_DG_STYLUS)
887                 return 0;
888 
889         if (field->application == HID_DG_TOUCHSCREEN ||
890             field->application == HID_DG_TOUCHPAD)
891                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
892 
893         /* let hid-core decide for the others */
894         return 0;
895 }
896 
897 static int mt_event(struct hid_device *hid, struct hid_field *field,
898                                 struct hid_usage *usage, __s32 value)
899 {
900         struct mt_device *td = hid_get_drvdata(hid);
901 
902         if (field->report->id == td->mt_report_id)
903                 return mt_touch_event(hid, field, usage, value);
904 
905         return 0;
906 }
907 
908 static void mt_report(struct hid_device *hid, struct hid_report *report)
909 {
910         struct mt_device *td = hid_get_drvdata(hid);
911         struct hid_field *field = report->field[0];
912 
913         if (!(hid->claimed & HID_CLAIMED_INPUT))
914                 return;
915 
916         if (report->id == td->mt_report_id)
917                 return mt_touch_report(hid, report);
918 
919         if (field && field->hidinput && field->hidinput->input)
920                 input_sync(field->hidinput->input);
921 }
922 
923 static void mt_set_input_mode(struct hid_device *hdev)
924 {
925         struct mt_device *td = hid_get_drvdata(hdev);
926         struct hid_report *r;
927         struct hid_report_enum *re;
928         struct mt_class *cls = &td->mtclass;
929         char *buf;
930         int report_len;
931 
932         if (td->inputmode < 0)
933                 return;
934 
935         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
936         r = re->report_id_hash[td->inputmode];
937         if (r) {
938                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
939                         report_len = hid_report_len(r);
940                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
941                         if (!buf) {
942                                 hid_err(hdev, "failed to allocate buffer for report\n");
943                                 return;
944                         }
945                         hid_hw_raw_request(hdev, r->id, buf, report_len,
946                                            HID_FEATURE_REPORT,
947                                            HID_REQ_GET_REPORT);
948                         kfree(buf);
949                 }
950                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
951                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
952         }
953 }
954 
955 static void mt_set_maxcontacts(struct hid_device *hdev)
956 {
957         struct mt_device *td = hid_get_drvdata(hdev);
958         struct hid_report *r;
959         struct hid_report_enum *re;
960         int fieldmax, max;
961 
962         if (td->maxcontact_report_id < 0)
963                 return;
964 
965         if (!td->mtclass.maxcontacts)
966                 return;
967 
968         re = &hdev->report_enum[HID_FEATURE_REPORT];
969         r = re->report_id_hash[td->maxcontact_report_id];
970         if (r) {
971                 max = td->mtclass.maxcontacts;
972                 fieldmax = r->field[0]->logical_maximum;
973                 max = min(fieldmax, max);
974                 if (r->field[0]->value[0] != max) {
975                         r->field[0]->value[0] = max;
976                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
977                 }
978         }
979 }
980 
981 static void mt_post_parse_default_settings(struct mt_device *td)
982 {
983         __s32 quirks = td->mtclass.quirks;
984 
985         /* unknown serial device needs special quirks */
986         if (td->touches_by_report == 1) {
987                 quirks |= MT_QUIRK_ALWAYS_VALID;
988                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
989                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
990                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
991                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
992         }
993 
994         td->mtclass.quirks = quirks;
995 }
996 
997 static void mt_post_parse(struct mt_device *td)
998 {
999         struct mt_fields *f = td->fields;
1000         struct mt_class *cls = &td->mtclass;
1001 
1002         if (td->touches_by_report > 0) {
1003                 int field_count_per_touch = f->length / td->touches_by_report;
1004                 td->last_slot_field = f->usages[field_count_per_touch - 1];
1005         }
1006 
1007         if (td->cc_index < 0)
1008                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1009 }
1010 
1011 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
1012 {
1013         struct mt_device *td = hid_get_drvdata(hdev);
1014         char *name;
1015         const char *suffix = NULL;
1016         struct hid_field *field = hi->report->field[0];
1017         int ret;
1018 
1019         if (hi->report->id == td->mt_report_id) {
1020                 ret = mt_touch_input_configured(hdev, hi);
1021                 if (ret)
1022                         return ret;
1023         }
1024 
1025         /*
1026          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
1027          * for the stylus. Check this first, and then rely on the application
1028          * field.
1029          */
1030         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
1031                 suffix = "Pen";
1032                 /* force BTN_STYLUS to allow tablet matching in udev */
1033                 __set_bit(BTN_STYLUS, hi->input->keybit);
1034         } else {
1035                 switch (field->application) {
1036                 case HID_GD_KEYBOARD:
1037                         suffix = "Keyboard";
1038                         break;
1039                 case HID_GD_KEYPAD:
1040                         suffix = "Keypad";
1041                         break;
1042                 case HID_GD_MOUSE:
1043                         suffix = "Mouse";
1044                         break;
1045                 case HID_DG_STYLUS:
1046                         suffix = "Pen";
1047                         /* force BTN_STYLUS to allow tablet matching in udev */
1048                         __set_bit(BTN_STYLUS, hi->input->keybit);
1049                         break;
1050                 case HID_DG_TOUCHSCREEN:
1051                         /* we do not set suffix = "Touchscreen" */
1052                         break;
1053                 case HID_DG_TOUCHPAD:
1054                         suffix = "Touchpad";
1055                         break;
1056                 case HID_GD_SYSTEM_CONTROL:
1057                         suffix = "System Control";
1058                         break;
1059                 case HID_CP_CONSUMER_CONTROL:
1060                         suffix = "Consumer Control";
1061                         break;
1062                 default:
1063                         suffix = "UNKNOWN";
1064                         break;
1065                 }
1066         }
1067 
1068         if (suffix) {
1069                 name = devm_kzalloc(&hi->input->dev,
1070                                     strlen(hdev->name) + strlen(suffix) + 2,
1071                                     GFP_KERNEL);
1072                 if (name) {
1073                         sprintf(name, "%s %s", hdev->name, suffix);
1074                         hi->input->name = name;
1075                 }
1076         }
1077 
1078         return 0;
1079 }
1080 
1081 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1082 {
1083         int ret, i;
1084         struct mt_device *td;
1085         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1086 
1087         for (i = 0; mt_classes[i].name ; i++) {
1088                 if (id->driver_data == mt_classes[i].name) {
1089                         mtclass = &(mt_classes[i]);
1090                         break;
1091                 }
1092         }
1093 
1094         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1095         if (!td) {
1096                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1097                 return -ENOMEM;
1098         }
1099         td->mtclass = *mtclass;
1100         td->inputmode = -1;
1101         td->maxcontact_report_id = -1;
1102         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1103         td->cc_index = -1;
1104         td->mt_report_id = -1;
1105         hid_set_drvdata(hdev, td);
1106 
1107         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1108                                   GFP_KERNEL);
1109         if (!td->fields) {
1110                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1111                 return -ENOMEM;
1112         }
1113 
1114         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1115                 td->serial_maybe = true;
1116 
1117         /*
1118          * Store the initial quirk state
1119          */
1120         td->initial_quirks = hdev->quirks;
1121 
1122         /* This allows the driver to correctly support devices
1123          * that emit events over several HID messages.
1124          */
1125         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1126 
1127         /*
1128          * This allows the driver to handle different input sensors
1129          * that emits events through different reports on the same HID
1130          * device.
1131          */
1132         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1133         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1134 
1135         /*
1136          * Some multitouch screens do not like to be polled for input
1137          * reports. Fortunately, the Win8 spec says that all touches
1138          * should be sent during each report, making the initialization
1139          * of input reports unnecessary. For Win7 devices, well, let's hope
1140          * they will still be happy (this is only be a problem if a touch
1141          * was already there while probing the device).
1142          *
1143          * In addition some touchpads do not behave well if we read
1144          * all feature reports from them. Instead we prevent
1145          * initial report fetching and then selectively fetch each
1146          * report we are interested in.
1147          */
1148         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1149 
1150         ret = hid_parse(hdev);
1151         if (ret != 0)
1152                 return ret;
1153 
1154         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1155         if (ret)
1156                 return ret;
1157 
1158         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1159         if (ret)
1160                 dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
1161                                 hdev->name);
1162 
1163         mt_set_maxcontacts(hdev);
1164         mt_set_input_mode(hdev);
1165 
1166         /* release .fields memory as it is not used anymore */
1167         devm_kfree(&hdev->dev, td->fields);
1168         td->fields = NULL;
1169 
1170         return 0;
1171 }
1172 
1173 #ifdef CONFIG_PM
1174 static void mt_release_contacts(struct hid_device *hid)
1175 {
1176         struct hid_input *hidinput;
1177 
1178         list_for_each_entry(hidinput, &hid->inputs, list) {
1179                 struct input_dev *input_dev = hidinput->input;
1180                 struct input_mt *mt = input_dev->mt;
1181                 int i;
1182 
1183                 if (mt) {
1184                         for (i = 0; i < mt->num_slots; i++) {
1185                                 input_mt_slot(input_dev, i);
1186                                 input_mt_report_slot_state(input_dev,
1187                                                            MT_TOOL_FINGER,
1188                                                            false);
1189                         }
1190                         input_mt_sync_frame(input_dev);
1191                         input_sync(input_dev);
1192                 }
1193         }
1194 }
1195 
1196 static int mt_reset_resume(struct hid_device *hdev)
1197 {
1198         mt_release_contacts(hdev);
1199         mt_set_maxcontacts(hdev);
1200         mt_set_input_mode(hdev);
1201         return 0;
1202 }
1203 
1204 static int mt_resume(struct hid_device *hdev)
1205 {
1206         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1207          * It should be safe to send it to other devices too.
1208          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1209 
1210         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1211 
1212         return 0;
1213 }
1214 #endif
1215 
1216 static void mt_remove(struct hid_device *hdev)
1217 {
1218         struct mt_device *td = hid_get_drvdata(hdev);
1219 
1220         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1221         hid_hw_stop(hdev);
1222         hdev->quirks = td->initial_quirks;
1223 }
1224 
1225 /*
1226  * This list contains only:
1227  * - VID/PID of products not working with the default multitouch handling
1228  * - 2 generic rules.
1229  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1230  */
1231 static const struct hid_device_id mt_devices[] = {
1232 
1233         /* 3M panels */
1234         { .driver_data = MT_CLS_3M,
1235                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1236                         USB_DEVICE_ID_3M1968) },
1237         { .driver_data = MT_CLS_3M,
1238                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1239                         USB_DEVICE_ID_3M2256) },
1240         { .driver_data = MT_CLS_3M,
1241                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1242                         USB_DEVICE_ID_3M3266) },
1243 
1244         /* Anton devices */
1245         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1246                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1247                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1248 
1249         /* Atmel panels */
1250         { .driver_data = MT_CLS_SERIAL,
1251                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1252                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1253 
1254         /* Baanto multitouch devices */
1255         { .driver_data = MT_CLS_NSMU,
1256                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1257                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1258 
1259         /* Cando panels */
1260         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1261                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1262                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1263         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1264                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1265                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1266 
1267         /* Chunghwa Telecom touch panels */
1268         {  .driver_data = MT_CLS_NSMU,
1269                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1270                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1271 
1272         /* CJTouch panels */
1273         { .driver_data = MT_CLS_NSMU,
1274                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1275                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1276         { .driver_data = MT_CLS_NSMU,
1277                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1278                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1279 
1280         /* CVTouch panels */
1281         { .driver_data = MT_CLS_NSMU,
1282                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1283                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1284 
1285         /* eGalax devices (resistive) */
1286         { .driver_data = MT_CLS_EGALAX,
1287                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1288                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1289         { .driver_data = MT_CLS_EGALAX,
1290                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1291                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1292 
1293         /* eGalax devices (capacitive) */
1294         { .driver_data = MT_CLS_EGALAX_SERIAL,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1296                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1297         { .driver_data = MT_CLS_EGALAX,
1298                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1299                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1300         { .driver_data = MT_CLS_EGALAX_SERIAL,
1301                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1302                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1303         { .driver_data = MT_CLS_EGALAX_SERIAL,
1304                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1305                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1306         { .driver_data = MT_CLS_EGALAX_SERIAL,
1307                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1308                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1309         { .driver_data = MT_CLS_EGALAX_SERIAL,
1310                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1311                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1312         { .driver_data = MT_CLS_EGALAX,
1313                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1314                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1315         { .driver_data = MT_CLS_EGALAX,
1316                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1317                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1318         { .driver_data = MT_CLS_EGALAX_SERIAL,
1319                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1320                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1321         { .driver_data = MT_CLS_EGALAX,
1322                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1323                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1324         { .driver_data = MT_CLS_EGALAX,
1325                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1326                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1327         { .driver_data = MT_CLS_EGALAX,
1328                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1329                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1330         { .driver_data = MT_CLS_EGALAX,
1331                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1332                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1333         { .driver_data = MT_CLS_EGALAX_SERIAL,
1334                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1335                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1336         { .driver_data = MT_CLS_EGALAX_SERIAL,
1337                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1338                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1339         { .driver_data = MT_CLS_EGALAX_SERIAL,
1340                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1341                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1342 
1343         /* Elitegroup panel */
1344         { .driver_data = MT_CLS_SERIAL,
1345                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1346                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1347 
1348         /* Flatfrog Panels */
1349         { .driver_data = MT_CLS_FLATFROG,
1350                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1351                         USB_DEVICE_ID_MULTITOUCH_3200) },
1352 
1353         /* FocalTech Panels */
1354         { .driver_data = MT_CLS_SERIAL,
1355                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1356                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1357 
1358         /* GeneralTouch panel */
1359         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1360                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1361                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1362         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1363                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1364                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1365         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1366                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1367                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1368         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1369                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1370                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1371         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1372                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1373                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1374         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1375                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1376                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1377         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1378                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1379                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1380 
1381         /* Gametel game controller */
1382         { .driver_data = MT_CLS_NSMU,
1383                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1384                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1385 
1386         /* GoodTouch panels */
1387         { .driver_data = MT_CLS_NSMU,
1388                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1389                         USB_DEVICE_ID_GOODTOUCH_000f) },
1390 
1391         /* Hanvon panels */
1392         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1393                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1394                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1395 
1396         /* Ilitek dual touch panel */
1397         {  .driver_data = MT_CLS_NSMU,
1398                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1399                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1400 
1401         /* MosArt panels */
1402         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1403                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1404                         USB_DEVICE_ID_ASUS_T91MT)},
1405         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1406                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1407                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1408         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1409                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1410                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1411 
1412         /* Panasonic panels */
1413         { .driver_data = MT_CLS_PANASONIC,
1414                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1415                         USB_DEVICE_ID_PANABOARD_UBT780) },
1416         { .driver_data = MT_CLS_PANASONIC,
1417                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1418                         USB_DEVICE_ID_PANABOARD_UBT880) },
1419 
1420         /* Novatek Panel */
1421         { .driver_data = MT_CLS_NSMU,
1422                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1423                         USB_DEVICE_ID_NOVATEK_PCT) },
1424 
1425         /* Ntrig Panel */
1426         { .driver_data = MT_CLS_NSMU,
1427                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1428                         USB_VENDOR_ID_NTRIG, 0x1b05) },
1429 
1430         /* PixArt optical touch screen */
1431         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1432                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1433                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1434         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1435                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1436                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1437         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1438                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1439                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1440 
1441         /* PixCir-based panels */
1442         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1443                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1444                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1445 
1446         /* Quanta-based panels */
1447         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1448                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1449                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1450 
1451         /* Stantum panels */
1452         { .driver_data = MT_CLS_CONFIDENCE,
1453                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1454                         USB_DEVICE_ID_MTP_STM)},
1455 
1456         /* TopSeed panels */
1457         { .driver_data = MT_CLS_TOPSEED,
1458                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1459                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1460 
1461         /* Touch International panels */
1462         { .driver_data = MT_CLS_NSMU,
1463                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1464                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1465 
1466         /* Unitec panels */
1467         { .driver_data = MT_CLS_NSMU,
1468                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1469                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1470         { .driver_data = MT_CLS_NSMU,
1471                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1472                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1473 
1474         /* VTL panels */
1475         { .driver_data = MT_CLS_VTL,
1476                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1477                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1478 
1479         /* Wistron panels */
1480         { .driver_data = MT_CLS_NSMU,
1481                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1482                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1483 
1484         /* XAT */
1485         { .driver_data = MT_CLS_NSMU,
1486                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1487                         USB_DEVICE_ID_XAT_CSR) },
1488 
1489         /* Xiroku */
1490         { .driver_data = MT_CLS_NSMU,
1491                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1492                         USB_DEVICE_ID_XIROKU_SPX) },
1493         { .driver_data = MT_CLS_NSMU,
1494                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1495                         USB_DEVICE_ID_XIROKU_MPX) },
1496         { .driver_data = MT_CLS_NSMU,
1497                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1498                         USB_DEVICE_ID_XIROKU_CSR) },
1499         { .driver_data = MT_CLS_NSMU,
1500                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1501                         USB_DEVICE_ID_XIROKU_SPX1) },
1502         { .driver_data = MT_CLS_NSMU,
1503                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1504                         USB_DEVICE_ID_XIROKU_MPX1) },
1505         { .driver_data = MT_CLS_NSMU,
1506                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1507                         USB_DEVICE_ID_XIROKU_CSR1) },
1508         { .driver_data = MT_CLS_NSMU,
1509                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1510                         USB_DEVICE_ID_XIROKU_SPX2) },
1511         { .driver_data = MT_CLS_NSMU,
1512                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1513                         USB_DEVICE_ID_XIROKU_MPX2) },
1514         { .driver_data = MT_CLS_NSMU,
1515                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1516                         USB_DEVICE_ID_XIROKU_CSR2) },
1517 
1518         /* Generic MT device */
1519         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1520 
1521         /* Generic Win 8 certified MT device */
1522         {  .driver_data = MT_CLS_WIN_8,
1523                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1524                         HID_ANY_ID, HID_ANY_ID) },
1525         { }
1526 };
1527 MODULE_DEVICE_TABLE(hid, mt_devices);
1528 
1529 static const struct hid_usage_id mt_grabbed_usages[] = {
1530         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1531         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1532 };
1533 
1534 static struct hid_driver mt_driver = {
1535         .name = "hid-multitouch",
1536         .id_table = mt_devices,
1537         .probe = mt_probe,
1538         .remove = mt_remove,
1539         .input_mapping = mt_input_mapping,
1540         .input_mapped = mt_input_mapped,
1541         .input_configured = mt_input_configured,
1542         .feature_mapping = mt_feature_mapping,
1543         .usage_table = mt_grabbed_usages,
1544         .event = mt_event,
1545         .report = mt_report,
1546 #ifdef CONFIG_PM
1547         .reset_resume = mt_reset_resume,
1548         .resume = mt_resume,
1549 #endif
1550 };
1551 module_hid_driver(mt_driver);
1552 

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