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By visual inspection, the reported touch_major and touch_minor axes are a factor of two too large. Presumably the device actually reports the width_major and width_minor, which are generally about a factor of two larger than the touches themselves. Signed-off-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
334 lines
8.3 KiB
C
334 lines
8.3 KiB
C
/*
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* HID driver for 3M PCT multitouch panels
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*
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* Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
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* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
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* Copyright (c) 2010 Canonical, Ltd.
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*
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
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MODULE_DESCRIPTION("3M PCT multitouch panels");
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MODULE_LICENSE("GPL");
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#include "hid-ids.h"
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#define MAX_SLOTS 60
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#define MAX_TRKID USHRT_MAX
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#define MAX_EVENTS 360
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/* estimated signal-to-noise ratios */
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#define SN_MOVE 2048
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#define SN_WIDTH 128
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struct mmm_finger {
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__s32 x, y, w, h;
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__u16 id;
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bool prev_touch;
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bool touch, valid;
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};
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struct mmm_data {
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struct mmm_finger f[MAX_SLOTS];
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__u16 id;
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__u8 curid;
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__u8 nexp, nreal;
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bool touch, valid;
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};
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static int mmm_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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int f1 = field->logical_minimum;
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int f2 = field->logical_maximum;
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int df = f2 - f1;
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switch (usage->hid & HID_USAGE_PAGE) {
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case HID_UP_BUTTON:
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return -1;
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case HID_UP_GENDESK:
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switch (usage->hid) {
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case HID_GD_X:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_X);
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input_set_abs_params(hi->input, ABS_MT_POSITION_X,
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f1, f2, df / SN_MOVE, 0);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_X,
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f1, f2, df / SN_MOVE, 0);
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return 1;
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case HID_GD_Y:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_POSITION_Y);
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input_set_abs_params(hi->input, ABS_MT_POSITION_Y,
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f1, f2, df / SN_MOVE, 0);
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/* touchscreen emulation */
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input_set_abs_params(hi->input, ABS_Y,
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f1, f2, df / SN_MOVE, 0);
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return 1;
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}
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return 0;
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case HID_UP_DIGITIZER:
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switch (usage->hid) {
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/* we do not want to map these: no input-oriented meaning */
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case 0x14:
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case 0x23:
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case HID_DG_INPUTMODE:
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case HID_DG_DEVICEINDEX:
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case HID_DG_CONTACTCOUNT:
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case HID_DG_CONTACTMAX:
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case HID_DG_INRANGE:
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case HID_DG_CONFIDENCE:
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return -1;
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case HID_DG_TIPSWITCH:
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/* touchscreen emulation */
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hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
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input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
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return 1;
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case HID_DG_WIDTH:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_TOUCH_MAJOR);
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input_set_abs_params(hi->input, ABS_MT_TOUCH_MAJOR,
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f1, f2, df / SN_WIDTH, 0);
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return 1;
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case HID_DG_HEIGHT:
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_TOUCH_MINOR);
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input_set_abs_params(hi->input, ABS_MT_TOUCH_MINOR,
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f1, f2, df / SN_WIDTH, 0);
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input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
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0, 1, 0, 0);
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return 1;
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case HID_DG_CONTACTID:
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field->logical_maximum = MAX_TRKID;
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hid_map_usage(hi, usage, bit, max,
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EV_ABS, ABS_MT_TRACKING_ID);
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input_set_abs_params(hi->input, ABS_MT_TRACKING_ID,
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0, MAX_TRKID, 0, 0);
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if (!hi->input->mt)
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input_mt_create_slots(hi->input, MAX_SLOTS);
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input_set_events_per_packet(hi->input, MAX_EVENTS);
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return 1;
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}
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/* let hid-input decide for the others */
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return 0;
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case 0xff000000:
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/* we do not want to map these: no input-oriented meaning */
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return -1;
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}
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return 0;
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}
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static int mmm_input_mapped(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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/* tell hid-input to skip setup of these event types */
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if (usage->type == EV_KEY || usage->type == EV_ABS)
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set_bit(usage->type, hi->input->evbit);
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return -1;
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}
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/*
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* this function is called when a whole packet has been received and processed,
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* so that it can decide what to send to the input layer.
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*/
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static void mmm_filter_event(struct mmm_data *md, struct input_dev *input)
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{
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struct mmm_finger *oldest = 0;
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int i;
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for (i = 0; i < MAX_SLOTS; ++i) {
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struct mmm_finger *f = &md->f[i];
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if (!f->valid) {
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/* this finger is just placeholder data, ignore */
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continue;
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}
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input_mt_slot(input, i);
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if (f->touch) {
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/* this finger is on the screen */
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int wide = (f->w > f->h);
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/* divided by two to match visual scale of touch */
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int major = max(f->w, f->h) >> 1;
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int minor = min(f->w, f->h) >> 1;
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if (!f->prev_touch)
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f->id = md->id++;
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input_event(input, EV_ABS, ABS_MT_TRACKING_ID, f->id);
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input_event(input, EV_ABS, ABS_MT_POSITION_X, f->x);
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input_event(input, EV_ABS, ABS_MT_POSITION_Y, f->y);
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input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
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input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
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input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
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/* touchscreen emulation: pick the oldest contact */
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if (!oldest || ((f->id - oldest->id) & (SHRT_MAX + 1)))
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oldest = f;
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} else {
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/* this finger took off the screen */
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input_event(input, EV_ABS, ABS_MT_TRACKING_ID, -1);
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}
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f->prev_touch = f->touch;
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f->valid = 0;
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}
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/* touchscreen emulation */
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if (oldest) {
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input_event(input, EV_KEY, BTN_TOUCH, 1);
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input_event(input, EV_ABS, ABS_X, oldest->x);
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input_event(input, EV_ABS, ABS_Y, oldest->y);
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} else {
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input_event(input, EV_KEY, BTN_TOUCH, 0);
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}
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input_sync(input);
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}
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/*
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* this function is called upon all reports
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* so that we can accumulate contact point information,
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* and call input_mt_sync after each point.
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*/
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static int mmm_event(struct hid_device *hid, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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struct mmm_data *md = hid_get_drvdata(hid);
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/*
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* strangely, this function can be called before
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* field->hidinput is initialized!
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*/
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if (hid->claimed & HID_CLAIMED_INPUT) {
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struct input_dev *input = field->hidinput->input;
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switch (usage->hid) {
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case HID_DG_TIPSWITCH:
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md->touch = value;
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break;
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case HID_DG_CONFIDENCE:
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md->valid = value;
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break;
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case HID_DG_WIDTH:
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if (md->valid)
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md->f[md->curid].w = value;
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break;
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case HID_DG_HEIGHT:
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if (md->valid)
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md->f[md->curid].h = value;
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break;
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case HID_DG_CONTACTID:
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value = clamp_val(value, 0, MAX_SLOTS - 1);
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if (md->valid) {
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md->curid = value;
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md->f[value].touch = md->touch;
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md->f[value].valid = 1;
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md->nreal++;
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}
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break;
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case HID_GD_X:
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if (md->valid)
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md->f[md->curid].x = value;
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break;
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case HID_GD_Y:
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if (md->valid)
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md->f[md->curid].y = value;
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break;
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case HID_DG_CONTACTCOUNT:
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if (value)
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md->nexp = value;
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if (md->nreal >= md->nexp) {
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mmm_filter_event(md, input);
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md->nreal = 0;
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}
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break;
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}
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}
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/* we have handled the hidinput part, now remains hiddev */
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if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
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hid->hiddev_hid_event(hid, field, usage, value);
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return 1;
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}
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static int mmm_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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struct mmm_data *md;
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hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
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md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
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if (!md) {
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dev_err(&hdev->dev, "cannot allocate 3M data\n");
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return -ENOMEM;
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}
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hid_set_drvdata(hdev, md);
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ret = hid_parse(hdev);
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if (!ret)
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret)
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kfree(md);
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return ret;
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}
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static void mmm_remove(struct hid_device *hdev)
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{
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hid_hw_stop(hdev);
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kfree(hid_get_drvdata(hdev));
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hid_set_drvdata(hdev, NULL);
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}
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static const struct hid_device_id mmm_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M2256) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, mmm_devices);
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static const struct hid_usage_id mmm_grabbed_usages[] = {
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{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
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{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
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};
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static struct hid_driver mmm_driver = {
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.name = "3m-pct",
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.id_table = mmm_devices,
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.probe = mmm_probe,
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.remove = mmm_remove,
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.input_mapping = mmm_input_mapping,
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.input_mapped = mmm_input_mapped,
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.usage_table = mmm_grabbed_usages,
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.event = mmm_event,
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};
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static int __init mmm_init(void)
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{
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return hid_register_driver(&mmm_driver);
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}
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static void __exit mmm_exit(void)
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{
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hid_unregister_driver(&mmm_driver);
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}
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module_init(mmm_init);
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module_exit(mmm_exit);
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