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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for some a4tech "special" devices
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2006-2007 Jiri Kosina
* Copyright (c) 2008 Jiri Slaby
*/
/*
*/
#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "hid-ids.h"
#define A4_2WHEEL_MOUSE_HACK_7 0x01
#define A4_2WHEEL_MOUSE_HACK_B8 0x02
#define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8)
struct a4tech_sc {
unsigned long quirks;
unsigned int hw_wheel;
__s32 delayed_value;
};
static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
struct a4tech_sc *a4 = hid_get_drvdata(hdev);
if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
usage->hid == A4_WHEEL_ORIENTATION) {
/*
* We do not want to have this usage mapped to anything as it's
* nonstandard and doesn't really behave like an HID report.
* It's only selecting the orientation (vertical/horizontal) of
* the previous mouse wheel report. The input_events will be
* generated once both reports are recorded in a4_event().
*/
return -1;
}
return 0;
}
static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
struct a4tech_sc *a4 = hid_get_drvdata(hdev);
if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
set_bit(REL_HWHEEL, *bit);
set_bit(REL_HWHEEL_HI_RES, *bit);
}
if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
return -1;
return 0;
}
static int a4_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct a4tech_sc *a4 = hid_get_drvdata(hdev);
struct input_dev *input;
if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
return 0;
input = field->hidinput->input;
if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
a4->delayed_value = value;
return 1;
}
if (usage->hid == A4_WHEEL_ORIENTATION) {
input_event(input, EV_REL, value ? REL_HWHEEL :
REL_WHEEL, a4->delayed_value);
input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
REL_WHEEL_HI_RES, a4->delayed_value * 120);
return 1;
}
}
if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
a4->hw_wheel = !!value;
return 1;
}
if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
input_event(input, usage->type, REL_HWHEEL, value);
input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
return 1;
}
return 0;
}
static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct a4tech_sc *a4;
int ret;
a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
if (a4 == NULL) {
hid_err(hdev, "can't alloc device descriptor\n");
return -ENOMEM;
}
a4->quirks = id->driver_data;
hid_set_drvdata(hdev, a4);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
return ret;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "hw start failed\n");
return ret;
}
return 0;
}
static const struct hid_device_id a4_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
.driver_data = A4_2WHEEL_MOUSE_HACK_7 },
{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
{ }
};
MODULE_DEVICE_TABLE(hid, a4_devices);
static struct hid_driver a4_driver = {
.name = "a4tech",
.id_table = a4_devices,
.input_mapping = a4_input_mapping,
.input_mapped = a4_input_mapped,
.event = a4_event,
.probe = a4_probe,
};
module_hid_driver(a4_driver);
MODULE_LICENSE("GPL");
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