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/*
* HID driver for ELO usb touchscreen 4000/4500
*
* Copyright (c) 2013 Jiri Slaby
*
* Data parsing taken from elousb driver by Vojtech Pavlik.
*
* This driver is licensed under the terms of GPLv2.
*/
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include "hid-ids.h"
static void elo_input_configured(struct hid_device *hdev,
struct hid_input *hidinput)
{
struct input_dev *input = hidinput->input;
set_bit(BTN_TOUCH, input->keybit);
set_bit(ABS_PRESSURE, input->absbit);
input_set_abs_params(input, ABS_PRESSURE, 0, 256, 0, 0);
}
static void elo_process_data(struct input_dev *input, const u8 *data, int size)
{
int press;
input_report_abs(input, ABS_X, (data[3] << 8) | data[2]);
input_report_abs(input, ABS_Y, (data[5] << 8) | data[4]);
press = 0;
if (data[1] & 0x80)
press = (data[7] << 8) | data[6];
input_report_abs(input, ABS_PRESSURE, press);
if (data[1] & 0x03) {
input_report_key(input, BTN_TOUCH, 1);
input_sync(input);
}
if (data[1] & 0x04)
input_report_key(input, BTN_TOUCH, 0);
input_sync(input);
}
static int elo_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *data, int size)
{
struct hid_input *hidinput;
if (!(hdev->claimed & HID_CLAIMED_INPUT) || list_empty(&hdev->inputs))
return 0;
hidinput = list_first_entry(&hdev->inputs, struct hid_input, list);
switch (report->id) {
case 0:
if (data[0] == 'T') { /* Mandatory ELO packet marker */
elo_process_data(hidinput->input, data, size);
return 1;
}
break;
default: /* unknown report */
/* Unknown report type; pass upstream */
hid_info(hdev, "unknown report type %d\n", report->id);
break;
}
return 0;
}
static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
goto err_free;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "hw start failed\n");
goto err_free;
}
return 0;
err_free:
return ret;
}
static void elo_remove(struct hid_device *hdev)
{
hid_hw_stop(hdev);
}
static const struct hid_device_id elo_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0009), },
{ HID_USB_DEVICE(USB_VENDOR_ID_ELO, 0x0030), },
{ }
};
MODULE_DEVICE_TABLE(hid, elo_devices);
static struct hid_driver elo_driver = {
.name = "elo",
.id_table = elo_devices,
.probe = elo_probe,
.remove = elo_remove,
.raw_event = elo_raw_event,
.input_configured = elo_input_configured,
};
static int __init elo_driver_init(void)
{
return hid_register_driver(&elo_driver);
}
module_init(elo_driver_init);
static void __exit elo_driver_exit(void)
{
hid_unregister_driver(&elo_driver);
}
module_exit(elo_driver_exit);
MODULE_AUTHOR("Jiri Slaby <jslaby@suse.cz>");
MODULE_LICENSE("GPL");
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