1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Force feedback support for Zeroplus based devices
4 *
5 *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
6 */
7
8/*
9 */
10
11
12#include <linux/hid.h>
13#include <linux/input.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16
17#include "hid-ids.h"
18
19#ifdef CONFIG_ZEROPLUS_FF
20
21struct zpff_device {
22	struct hid_report *report;
23};
24
25static int zpff_play(struct input_dev *dev, void *data,
26			 struct ff_effect *effect)
27{
28	struct hid_device *hid = input_get_drvdata(dev);
29	struct zpff_device *zpff = data;
30	int left, right;
31
32	/*
33	 * The following is specified the other way around in the Zeroplus
34	 * datasheet but the order below is correct for the XFX Executioner;
35	 * however it is possible that the XFX Executioner is an exception
36	 */
37
38	left = effect->u.rumble.strong_magnitude;
39	right = effect->u.rumble.weak_magnitude;
40	dbg_hid("called with 0x%04x 0x%04x\n", left, right);
41
42	left = left * 0x7f / 0xffff;
43	right = right * 0x7f / 0xffff;
44
45	zpff->report->field[2]->value[0] = left;
46	zpff->report->field[3]->value[0] = right;
47	dbg_hid("running with 0x%02x 0x%02x\n", left, right);
48	hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
49
50	return 0;
51}
52
53static int zpff_init(struct hid_device *hid)
54{
55	struct zpff_device *zpff;
56	struct hid_report *report;
57	struct hid_input *hidinput;
58	struct input_dev *dev;
59	int i, error;
60
61	if (list_empty(&hid->inputs)) {
62		hid_err(hid, "no inputs found\n");
63		return -ENODEV;
64	}
65	hidinput = list_entry(hid->inputs.next, struct hid_input, list);
66	dev = hidinput->input;
67
68	for (i = 0; i < 4; i++) {
69		report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
70		if (!report)
71			return -ENODEV;
72	}
73
74	zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
75	if (!zpff)
76		return -ENOMEM;
77
78	set_bit(FF_RUMBLE, dev->ffbit);
79
80	error = input_ff_create_memless(dev, zpff, zpff_play);
81	if (error) {
82		kfree(zpff);
83		return error;
84	}
85
86	zpff->report = report;
87	zpff->report->field[0]->value[0] = 0x00;
88	zpff->report->field[1]->value[0] = 0x02;
89	zpff->report->field[2]->value[0] = 0x00;
90	zpff->report->field[3]->value[0] = 0x00;
91	hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
92
93	hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
94
95	return 0;
96}
97#else
98static inline int zpff_init(struct hid_device *hid)
99{
100	return 0;
101}
102#endif
103
104static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
105{
106	int ret;
107
108	ret = hid_parse(hdev);
109	if (ret) {
110		hid_err(hdev, "parse failed\n");
111		goto err;
112	}
113
114	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
115	if (ret) {
116		hid_err(hdev, "hw start failed\n");
117		goto err;
118	}
119
120	zpff_init(hdev);
121
122	return 0;
123err:
124	return ret;
125}
126
127static const struct hid_device_id zp_devices[] = {
128	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
129	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
130	{ }
131};
132MODULE_DEVICE_TABLE(hid, zp_devices);
133
134static struct hid_driver zp_driver = {
135	.name = "zeroplus",
136	.id_table = zp_devices,
137	.probe = zp_probe,
138};
139module_hid_driver(zp_driver);
140
141MODULE_LICENSE("GPL");
142