/*
* HID driver for Quanta Optical Touch dual-touch panels
*
* Copyright (c) 2009-2010 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>
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
MODULE_DESCRIPTION("Quanta dual-touch panel");
MODULE_LICENSE("GPL");
#include "hid-ids.h"
struct quanta_data {
__u16 x, y;
__u8 id;
bool valid; /* valid finger data, or just placeholder? */
bool first; /* is this the first finger in this frame? */
bool activity_now; /* at least one active finger in this frame? */
bool activity; /* at least one active finger previously? */
};
static int quanta_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_CONFIDENCE:
case HID_DG_TIPSWITCH:
case HID_DG_INPUTMODE:
case HID_DG_DEVICEINDEX:
case HID_DG_CONTACTCOUNT:
case HID_DG_CONTACTMAX:
case HID_DG_TIPPRESSURE:
case HID_DG_WIDTH:
case HID_DG_HEIGHT:
return -1;
case HID_DG_INRANGE:
/* touchscreen emulation */
hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
return 1;
case HID_DG_CONTACTID:
hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_TRACKING_ID);
return 1;
}
return 0;
case 0xff000000:
/* ignore vendor-specific features */
return -1;
}
return 0;
}
static int quanta_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 quanta_filter_event(struct quanta_data *td, struct input_dev *input)
{
td->first = !td->first; /* touchscreen emulation */
if (!td->valid) {
/*
* touchscreen emulation: if no finger in this frame is valid
* and there previously was finger activity, this is a release
*/
if (!td->first && !td->activity_now && td->activity) {
input_event(input, EV_KEY, BTN_TOUCH, 0);
td->activity = false;
}
return;
}
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_mt_sync(input);
td->valid = false;
/* touchscreen emulation: if first active finger in this frame... */
if (!td->activity_now) {
/* if there was no previous activity, emit touch event */
if (!td->activity) {
input_event(input, EV_KEY, BTN_TOUCH, 1);
td->activity = true;
}
td->activity_now = true;
/* and in any case this is our preferred finger */
input_event(input, EV_ABS, ABS_X, td->x);
input_event(input, EV_ABS, ABS_Y, td->y);
}
}
static int quanta_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct quanta_data *td = hid_get_drvdata(hid);
if (hid->claimed & HID_CLAIMED_INPUT) {
struct input_dev *input = field->hidinput->input;
switch (usage->hid) {
case HID_DG_INRANGE:
td->valid = !!value;
break;
case HID_GD_X:
td->x = value;
break;
case HID_GD_Y:
td->y = value;
quanta_filter_event(td, input);
break;
case HID_DG_CONTACTID:
td->id = value;
break;
case HID_DG_CONTACTCOUNT:
/* touch emulation: this is the last field in a frame */
td->first = false;
td->activity_now = false;
break;
case HID_DG_CONFIDENCE:
case HID_DG_TIPSWITCH:
/* avoid interference from generic hidinput handling */
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 quanta_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
struct quanta_data *td;
td = kmalloc(sizeof(struct quanta_data), GFP_KERNEL);
if (!td) {
dev_err(&hdev->dev, "cannot allocate Quanta Touch data\n");
return -ENOMEM;
}
td->valid = false;
td->activity = false;
td->activity_now = false;
td->first = false;
hid_set_drvdata(hdev, td);
ret = hid_parse(hdev);
if (!ret)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
kfree(td);
return ret;
}
static void quanta_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 quanta_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
{ HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
USB_DEVICE_ID_PIXART_IMAGING_INC_OPTICAL_TOUCH_SCREEN) },
{ }
};
MODULE_DEVICE_TABLE(hid, quanta_devices);
static const struct hid_usage_id quanta_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 quanta_driver = {
.name = "quanta-touch",
.id_table = quanta_devices,
.probe = quanta_probe,
.remove = quanta_remove,
.input_mapping = quanta_input_mapping,
.input_mapped = quanta_input_mapped,
.usage_table = quanta_grabbed_usages,
.event = quanta_event,
};
static int __init quanta_init(void)
{
return hid_register_driver(&quanta_driver);
}
static void __exit quanta_exit(void)
{
hid_unregister_driver(&quanta_driver);
}
module_init(quanta_init);
module_exit(quanta_exit);
