388 lines
9.2 KiB
C
388 lines
9.2 KiB
C
/*
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* HID driver for N-Trig touchscreens
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*
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* Copyright (c) 2008 Rafi Rubin
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* Copyright (c) 2009 Stephane Chatty
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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 "hid-ids.h"
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#define NTRIG_DUPLICATE_USAGES 0x001
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#define nt_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
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EV_KEY, (c))
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struct ntrig_data {
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/* Incoming raw values for a single contact */
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__u16 x, y, w, h;
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__u16 id;
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__u8 confidence;
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bool reading_mt;
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__u8 first_contact_confidence;
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__u8 mt_footer[4];
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__u8 mt_foot_count;
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};
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/*
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* this driver is aimed at two firmware versions in circulation:
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* - dual pen/finger single touch
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* - finger multitouch, pen not working
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*/
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static int ntrig_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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/* No special mappings needed for the pen and single touch */
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if (field->physical)
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return 0;
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switch (usage->hid & HID_USAGE_PAGE) {
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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_X,
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field->logical_minimum,
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field->logical_maximum, 0, 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_Y,
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field->logical_minimum,
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field->logical_maximum, 0, 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 for now */
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case HID_DG_CONTACTID: /* Not trustworthy, squelch for now */
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case HID_DG_INPUTMODE:
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case HID_DG_DEVICEINDEX:
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case HID_DG_CONTACTMAX:
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return -1;
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/* width/height mapped on TouchMajor/TouchMinor/Orientation */
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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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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_ORIENTATION,
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0, 1, 0, 0);
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return 1;
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}
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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 ntrig_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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/* No special mappings needed for the pen and single touch */
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if (field->physical)
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return 0;
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if (usage->type == EV_KEY || usage->type == EV_REL
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|| usage->type == EV_ABS)
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clear_bit(usage->code, *bit);
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return 0;
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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 filter contact point information,
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* decide whether we are in multi or single touch mode
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* and call input_mt_sync after each point if necessary
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*/
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static int ntrig_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 input_dev *input = field->hidinput->input;
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struct ntrig_data *nd = hid_get_drvdata(hid);
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/* No special handling needed for the pen */
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if (field->application == HID_DG_PEN)
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return 0;
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if (hid->claimed & HID_CLAIMED_INPUT) {
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switch (usage->hid) {
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case 0xff000001:
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/* Tag indicating the start of a multitouch group */
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nd->reading_mt = 1;
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nd->first_contact_confidence = 0;
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break;
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case HID_DG_CONFIDENCE:
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nd->confidence = value;
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break;
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case HID_GD_X:
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nd->x = value;
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/* Clear the contact footer */
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nd->mt_foot_count = 0;
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break;
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case HID_GD_Y:
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nd->y = value;
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break;
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case HID_DG_CONTACTID:
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nd->id = value;
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break;
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case HID_DG_WIDTH:
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nd->w = value;
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break;
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case HID_DG_HEIGHT:
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nd->h = value;
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/*
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* when in single touch mode, this is the last
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* report received in a finger event. We want
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* to emit a normal (X, Y) position
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*/
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if (!nd->reading_mt) {
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input_report_key(input, BTN_TOOL_DOUBLETAP,
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(nd->confidence != 0));
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input_event(input, EV_ABS, ABS_X, nd->x);
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input_event(input, EV_ABS, ABS_Y, nd->y);
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}
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break;
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case 0xff000002:
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/*
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* we receive this when the device is in multitouch
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* mode. The first of the three values tagged with
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* this usage tells if the contact point is real
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* or a placeholder
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*/
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/* Shouldn't get more than 4 footer packets, so skip */
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if (nd->mt_foot_count >= 4)
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break;
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nd->mt_footer[nd->mt_foot_count++] = value;
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/* if the footer isn't complete break */
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if (nd->mt_foot_count != 4)
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break;
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/* Pen activity signal, trigger end of touch. */
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if (nd->mt_footer[2]) {
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nd->confidence = 0;
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break;
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}
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/* If the contact was invalid */
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if (!(nd->confidence && nd->mt_footer[0])
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|| nd->w <= 250
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|| nd->h <= 190) {
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nd->confidence = 0;
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break;
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}
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/* emit a normal (X, Y) for the first point only */
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if (nd->id == 0) {
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nd->first_contact_confidence = nd->confidence;
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input_event(input, EV_ABS, ABS_X, nd->x);
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input_event(input, EV_ABS, ABS_Y, nd->y);
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}
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input_event(input, EV_ABS, ABS_MT_POSITION_X, nd->x);
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input_event(input, EV_ABS, ABS_MT_POSITION_Y, nd->y);
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if (nd->w > nd->h) {
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input_event(input, EV_ABS,
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ABS_MT_ORIENTATION, 1);
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input_event(input, EV_ABS,
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ABS_MT_TOUCH_MAJOR, nd->w);
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input_event(input, EV_ABS,
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ABS_MT_TOUCH_MINOR, nd->h);
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} else {
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input_event(input, EV_ABS,
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ABS_MT_ORIENTATION, 0);
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input_event(input, EV_ABS,
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ABS_MT_TOUCH_MAJOR, nd->h);
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input_event(input, EV_ABS,
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ABS_MT_TOUCH_MINOR, nd->w);
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}
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input_mt_sync(field->hidinput->input);
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break;
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case HID_DG_CONTACTCOUNT: /* End of a multitouch group */
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if (!nd->reading_mt)
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break;
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nd->reading_mt = 0;
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if (nd->first_contact_confidence) {
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switch (value) {
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case 0: /* for single touch devices */
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case 1:
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input_report_key(input,
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BTN_TOOL_DOUBLETAP, 1);
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break;
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case 2:
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input_report_key(input,
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BTN_TOOL_TRIPLETAP, 1);
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break;
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case 3:
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default:
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input_report_key(input,
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BTN_TOOL_QUADTAP, 1);
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}
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input_report_key(input, BTN_TOUCH, 1);
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} else {
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input_report_key(input,
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BTN_TOOL_DOUBLETAP, 0);
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input_report_key(input,
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BTN_TOOL_TRIPLETAP, 0);
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input_report_key(input,
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BTN_TOOL_QUADTAP, 0);
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}
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break;
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default:
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/* fallback to the generic hidinput handling */
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return 0;
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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 ntrig_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 ntrig_data *nd;
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struct hid_input *hidinput;
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struct input_dev *input;
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if (id->driver_data)
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hdev->quirks |= HID_QUIRK_MULTI_INPUT;
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nd = kmalloc(sizeof(struct ntrig_data), GFP_KERNEL);
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if (!nd) {
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dev_err(&hdev->dev, "cannot allocate N-Trig data\n");
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return -ENOMEM;
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}
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nd->reading_mt = 0;
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hid_set_drvdata(hdev, nd);
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ret = hid_parse(hdev);
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if (ret) {
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dev_err(&hdev->dev, "parse failed\n");
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goto err_free;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (ret) {
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dev_err(&hdev->dev, "hw start failed\n");
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goto err_free;
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}
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list_for_each_entry(hidinput, &hdev->inputs, list) {
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input = hidinput->input;
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switch (hidinput->report->field[0]->application) {
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case HID_DG_PEN:
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input->name = "N-Trig Pen";
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break;
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case HID_DG_TOUCHSCREEN:
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__clear_bit(BTN_TOOL_PEN, input->keybit);
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/*
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* A little something special to enable
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* two and three finger taps.
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*/
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__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
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__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
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__set_bit(BTN_TOOL_QUADTAP, input->keybit);
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/*
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* The physical touchscreen (single touch)
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* input has a value for physical, whereas
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* the multitouch only has logical input
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* fields.
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*/
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input->name =
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(hidinput->report->field[0]
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->physical) ?
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"N-Trig Touchscreen" :
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"N-Trig MultiTouch";
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break;
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}
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}
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return 0;
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err_free:
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kfree(nd);
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return ret;
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}
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static void ntrig_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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}
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static const struct hid_device_id ntrig_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_TOUCH_SCREEN),
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.driver_data = NTRIG_DUPLICATE_USAGES },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, ntrig_devices);
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static const struct hid_usage_id ntrig_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 ntrig_driver = {
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.name = "ntrig",
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.id_table = ntrig_devices,
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.probe = ntrig_probe,
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.remove = ntrig_remove,
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.input_mapping = ntrig_input_mapping,
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.input_mapped = ntrig_input_mapped,
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.usage_table = ntrig_grabbed_usages,
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.event = ntrig_event,
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};
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static int __init ntrig_init(void)
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{
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return hid_register_driver(&ntrig_driver);
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}
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static void __exit ntrig_exit(void)
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{
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hid_unregister_driver(&ntrig_driver);
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}
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module_init(ntrig_init);
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module_exit(ntrig_exit);
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MODULE_LICENSE("GPL");
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