// 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 },	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95),		.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_DESCRIPTION("HID driver for some a4tech \"special\" devices");MODULE_LICENSE("GPL");