291 lines
7.2 KiB
C
291 lines
7.2 KiB
C
/*
|
|
* HID driver for eGalax dual-touch panels
|
|
*
|
|
* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/hid.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/slab.h>
|
|
#include "usbhid/usbhid.h"
|
|
|
|
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
|
|
MODULE_DESCRIPTION("eGalax dual-touch panel");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#include "hid-ids.h"
|
|
|
|
struct egalax_data {
|
|
__u16 x, y, z;
|
|
__u8 id;
|
|
bool first; /* is this the first finger in the frame? */
|
|
bool valid; /* valid finger data, or just placeholder? */
|
|
bool activity; /* at least one active finger previously? */
|
|
__u16 lastx, lasty; /* latest valid (x, y) in the frame */
|
|
};
|
|
|
|
static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
|
|
struct hid_field *field, struct hid_usage *usage,
|
|
unsigned long **bit, int *max)
|
|
{
|
|
switch (usage->hid & HID_USAGE_PAGE) {
|
|
|
|
case HID_UP_GENDESK:
|
|
switch (usage->hid) {
|
|
case HID_GD_X:
|
|
hid_map_usage(hi, usage, bit, max,
|
|
EV_ABS, ABS_MT_POSITION_X);
|
|
/* touchscreen emulation */
|
|
input_set_abs_params(hi->input, ABS_X,
|
|
field->logical_minimum,
|
|
field->logical_maximum, 0, 0);
|
|
return 1;
|
|
case HID_GD_Y:
|
|
hid_map_usage(hi, usage, bit, max,
|
|
EV_ABS, ABS_MT_POSITION_Y);
|
|
/* touchscreen emulation */
|
|
input_set_abs_params(hi->input, ABS_Y,
|
|
field->logical_minimum,
|
|
field->logical_maximum, 0, 0);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
|
|
case HID_UP_DIGITIZER:
|
|
switch (usage->hid) {
|
|
case HID_DG_TIPSWITCH:
|
|
/* touchscreen emulation */
|
|
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
|
|
return 1;
|
|
case HID_DG_INRANGE:
|
|
case HID_DG_CONFIDENCE:
|
|
case HID_DG_CONTACTCOUNT:
|
|
case HID_DG_CONTACTMAX:
|
|
return -1;
|
|
case HID_DG_CONTACTID:
|
|
hid_map_usage(hi, usage, bit, max,
|
|
EV_ABS, ABS_MT_TRACKING_ID);
|
|
return 1;
|
|
case HID_DG_TIPPRESSURE:
|
|
hid_map_usage(hi, usage, bit, max,
|
|
EV_ABS, ABS_MT_PRESSURE);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ignore others (from other reports we won't get anyway) */
|
|
return -1;
|
|
}
|
|
|
|
static int egalax_input_mapped(struct hid_device *hdev, struct hid_input *hi,
|
|
struct hid_field *field, struct hid_usage *usage,
|
|
unsigned long **bit, int *max)
|
|
{
|
|
if (usage->type == EV_KEY || usage->type == EV_ABS)
|
|
clear_bit(usage->code, *bit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this function is called when a whole finger has been parsed,
|
|
* so that it can decide what to send to the input layer.
|
|
*/
|
|
static void egalax_filter_event(struct egalax_data *td, struct input_dev *input)
|
|
{
|
|
td->first = !td->first; /* touchscreen emulation */
|
|
|
|
if (td->valid) {
|
|
/* emit multitouch events */
|
|
input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
|
|
input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
|
|
input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
|
|
input_event(input, EV_ABS, ABS_MT_PRESSURE, td->z);
|
|
|
|
input_mt_sync(input);
|
|
|
|
/*
|
|
* touchscreen emulation: store (x, y) as
|
|
* the last valid values in this frame
|
|
*/
|
|
td->lastx = td->x;
|
|
td->lasty = td->y;
|
|
}
|
|
|
|
/*
|
|
* touchscreen emulation: if this is the second finger and at least
|
|
* one in this frame is valid, the latest valid in the frame is
|
|
* the oldest on the panel, the one we want for single touch
|
|
*/
|
|
if (!td->first && td->activity) {
|
|
input_event(input, EV_ABS, ABS_X, td->lastx);
|
|
input_event(input, EV_ABS, ABS_Y, td->lasty);
|
|
}
|
|
|
|
if (!td->valid) {
|
|
/*
|
|
* touchscreen emulation: if the first finger is invalid
|
|
* and there previously was finger activity, this is a release
|
|
*/
|
|
if (td->first && td->activity) {
|
|
input_event(input, EV_KEY, BTN_TOUCH, 0);
|
|
td->activity = false;
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
/* touchscreen emulation: if no previous activity, emit touch event */
|
|
if (!td->activity) {
|
|
input_event(input, EV_KEY, BTN_TOUCH, 1);
|
|
td->activity = true;
|
|
}
|
|
}
|
|
|
|
|
|
static int egalax_event(struct hid_device *hid, struct hid_field *field,
|
|
struct hid_usage *usage, __s32 value)
|
|
{
|
|
struct egalax_data *td = hid_get_drvdata(hid);
|
|
|
|
/* Note, eGalax has two product lines: the first is resistive and
|
|
* uses a standard parallel multitouch protocol (product ID ==
|
|
* 48xx). The second is capacitive and uses an unusual "serial"
|
|
* protocol with a different message for each multitouch finger
|
|
* (product ID == 72xx). We do not yet generate a correct event
|
|
* sequence for the capacitive/serial protocol.
|
|
*/
|
|
if (hid->claimed & HID_CLAIMED_INPUT) {
|
|
struct input_dev *input = field->hidinput->input;
|
|
|
|
switch (usage->hid) {
|
|
case HID_DG_INRANGE:
|
|
case HID_DG_CONFIDENCE:
|
|
/* avoid interference from generic hidinput handling */
|
|
break;
|
|
case HID_DG_TIPSWITCH:
|
|
td->valid = value;
|
|
break;
|
|
case HID_DG_TIPPRESSURE:
|
|
td->z = value;
|
|
break;
|
|
case HID_DG_CONTACTID:
|
|
td->id = value;
|
|
break;
|
|
case HID_GD_X:
|
|
td->x = value;
|
|
break;
|
|
case HID_GD_Y:
|
|
td->y = value;
|
|
/* this is the last field in a finger */
|
|
egalax_filter_event(td, input);
|
|
break;
|
|
case HID_DG_CONTACTCOUNT:
|
|
/* touch emulation: this is the last field in a frame */
|
|
td->first = false;
|
|
break;
|
|
|
|
default:
|
|
/* fallback to the generic hidinput handling */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* we have handled the hidinput part, now remains hiddev */
|
|
if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
|
|
hid->hiddev_hid_event(hid, field, usage, value);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int egalax_probe(struct hid_device *hdev, const struct hid_device_id *id)
|
|
{
|
|
int ret;
|
|
struct egalax_data *td;
|
|
struct hid_report *report;
|
|
|
|
td = kmalloc(sizeof(struct egalax_data), GFP_KERNEL);
|
|
if (!td) {
|
|
dev_err(&hdev->dev, "cannot allocate eGalax data\n");
|
|
return -ENOMEM;
|
|
}
|
|
hid_set_drvdata(hdev, td);
|
|
|
|
ret = hid_parse(hdev);
|
|
if (ret)
|
|
goto end;
|
|
|
|
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
|
if (ret)
|
|
goto end;
|
|
|
|
report = hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[5];
|
|
if (report) {
|
|
report->field[0]->value[0] = 2;
|
|
usbhid_submit_report(hdev, report, USB_DIR_OUT);
|
|
}
|
|
|
|
end:
|
|
if (ret)
|
|
kfree(td);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void egalax_remove(struct hid_device *hdev)
|
|
{
|
|
hid_hw_stop(hdev);
|
|
kfree(hid_get_drvdata(hdev));
|
|
hid_set_drvdata(hdev, NULL);
|
|
}
|
|
|
|
static const struct hid_device_id egalax_devices[] = {
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
|
|
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
|
|
USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(hid, egalax_devices);
|
|
|
|
static const struct hid_usage_id egalax_grabbed_usages[] = {
|
|
{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
|
|
{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
|
|
};
|
|
|
|
static struct hid_driver egalax_driver = {
|
|
.name = "egalax-touch",
|
|
.id_table = egalax_devices,
|
|
.probe = egalax_probe,
|
|
.remove = egalax_remove,
|
|
.input_mapping = egalax_input_mapping,
|
|
.input_mapped = egalax_input_mapped,
|
|
.usage_table = egalax_grabbed_usages,
|
|
.event = egalax_event,
|
|
};
|
|
|
|
static int __init egalax_init(void)
|
|
{
|
|
return hid_register_driver(&egalax_driver);
|
|
}
|
|
|
|
static void __exit egalax_exit(void)
|
|
{
|
|
hid_unregister_driver(&egalax_driver);
|
|
}
|
|
|
|
module_init(egalax_init);
|
|
module_exit(egalax_exit);
|
|
|