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/drivers/hid/hid-a4tech.c

https://gitlab.com/TeamTators/hp-kernel-tenderloin
C | 161 lines | 114 code | 31 blank | 16 comment | 26 complexity | a38ea08e89429cb781569c07c7d06de7 MD5 | raw file
  1/*
  2 *  HID driver for some a4tech "special" devices
  3 *
  4 *  Copyright (c) 1999 Andreas Gal
  5 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  6 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  7 *  Copyright (c) 2006-2007 Jiri Kosina
  8 *  Copyright (c) 2007 Paul Walmsley
  9 *  Copyright (c) 2008 Jiri Slaby
 10 */
 11
 12/*
 13 * This program is free software; you can redistribute it and/or modify it
 14 * under the terms of the GNU General Public License as published by the Free
 15 * Software Foundation; either version 2 of the License, or (at your option)
 16 * any later version.
 17 */
 18
 19#include <linux/device.h>
 20#include <linux/input.h>
 21#include <linux/hid.h>
 22#include <linux/module.h>
 23#include <linux/slab.h>
 24
 25#include "hid-ids.h"
 26
 27#define A4_2WHEEL_MOUSE_HACK_7	0x01
 28#define A4_2WHEEL_MOUSE_HACK_B8	0x02
 29
 30struct a4tech_sc {
 31	unsigned long quirks;
 32	unsigned int hw_wheel;
 33	__s32 delayed_value;
 34};
 35
 36static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 37		struct hid_field *field, struct hid_usage *usage,
 38		unsigned long **bit, int *max)
 39{
 40	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
 41
 42	if (usage->type == EV_REL && usage->code == REL_WHEEL)
 43		set_bit(REL_HWHEEL, *bit);
 44
 45	if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
 46		return -1;
 47
 48	return 0;
 49}
 50
 51static int a4_event(struct hid_device *hdev, struct hid_field *field,
 52		struct hid_usage *usage, __s32 value)
 53{
 54	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
 55	struct input_dev *input;
 56
 57	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
 58			!usage->type)
 59		return 0;
 60
 61	input = field->hidinput->input;
 62
 63	if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
 64		if (usage->type == EV_REL && usage->code == REL_WHEEL) {
 65			a4->delayed_value = value;
 66			return 1;
 67		}
 68
 69		if (usage->hid == 0x000100b8) {
 70			input_event(input, EV_REL, value ? REL_HWHEEL :
 71					REL_WHEEL, a4->delayed_value);
 72			return 1;
 73		}
 74	}
 75
 76	if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
 77		a4->hw_wheel = !!value;
 78		return 1;
 79	}
 80
 81	if (usage->code == REL_WHEEL && a4->hw_wheel) {
 82		input_event(input, usage->type, REL_HWHEEL, value);
 83		return 1;
 84	}
 85
 86	return 0;
 87}
 88
 89static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
 90{
 91	struct a4tech_sc *a4;
 92	int ret;
 93
 94	a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
 95	if (a4 == NULL) {
 96		dev_err(&hdev->dev, "can't alloc device descriptor\n");
 97		ret = -ENOMEM;
 98		goto err_free;
 99	}
100
101	a4->quirks = id->driver_data;
102
103	hid_set_drvdata(hdev, a4);
104
105	ret = hid_parse(hdev);
106	if (ret) {
107		dev_err(&hdev->dev, "parse failed\n");
108		goto err_free;
109	}
110
111	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
112	if (ret) {
113		dev_err(&hdev->dev, "hw start failed\n");
114		goto err_free;
115	}
116
117	return 0;
118err_free:
119	kfree(a4);
120	return ret;
121}
122
123static void a4_remove(struct hid_device *hdev)
124{
125	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
126
127	hid_hw_stop(hdev);
128	kfree(a4);
129}
130
131static const struct hid_device_id a4_devices[] = {
132	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
133		.driver_data = A4_2WHEEL_MOUSE_HACK_7 },
134	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
135		.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
136	{ }
137};
138MODULE_DEVICE_TABLE(hid, a4_devices);
139
140static struct hid_driver a4_driver = {
141	.name = "a4tech",
142	.id_table = a4_devices,
143	.input_mapped = a4_input_mapped,
144	.event = a4_event,
145	.probe = a4_probe,
146	.remove = a4_remove,
147};
148
149static int __init a4_init(void)
150{
151	return hid_register_driver(&a4_driver);
152}
153
154static void __exit a4_exit(void)
155{
156	hid_unregister_driver(&a4_driver);
157}
158
159module_init(a4_init);
160module_exit(a4_exit);
161MODULE_LICENSE("GPL");