1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * HID driver for some a4tech "special" devices
5 * Copyright (c) 1999 Andreas Gal
6 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
7 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
8 * Copyright (c) 2006-2007 Jiri Kosina
9 * Copyright (c) 2008 Jiri Slaby
15 #include <linux/device.h>
16 #include <linux/input.h>
17 #include <linux/hid.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
23 #define A4_2WHEEL_MOUSE_HACK_7 0x01
24 #define A4_2WHEEL_MOUSE_HACK_B8 0x02
28 unsigned int hw_wheel;
32 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
33 struct hid_field *field, struct hid_usage *usage,
34 unsigned long **bit, int *max)
36 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
38 if (usage->type == EV_REL && usage->code == REL_WHEEL)
39 set_bit(REL_HWHEEL, *bit);
41 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
47 static int a4_event(struct hid_device *hdev, struct hid_field *field,
48 struct hid_usage *usage, __s32 value)
50 struct a4tech_sc *a4 = hid_get_drvdata(hdev);
51 struct input_dev *input;
53 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
57 input = field->hidinput->input;
59 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
60 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
61 a4->delayed_value = value;
65 if (usage->hid == 0x000100b8) {
66 input_event(input, EV_REL, value ? REL_HWHEEL :
67 REL_WHEEL, a4->delayed_value);
72 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
73 a4->hw_wheel = !!value;
77 if (usage->code == REL_WHEEL && a4->hw_wheel) {
78 input_event(input, usage->type, REL_HWHEEL, value);
85 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
90 a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
92 hid_err(hdev, "can't alloc device descriptor\n");
96 a4->quirks = id->driver_data;
98 hid_set_drvdata(hdev, a4);
100 ret = hid_parse(hdev);
102 hid_err(hdev, "parse failed\n");
106 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
108 hid_err(hdev, "hw start failed\n");
115 static const struct hid_device_id a4_devices[] = {
116 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
117 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
118 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
119 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
120 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
121 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
124 MODULE_DEVICE_TABLE(hid, a4_devices);
126 static struct hid_driver a4_driver = {
128 .id_table = a4_devices,
129 .input_mapped = a4_input_mapped,
133 module_hid_driver(a4_driver);
135 MODULE_LICENSE("GPL");