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 
21 struct zpff_device {
22 	struct hid_report *report;
23 };
24 
zpff_play(struct input_dev * dev,void * data,struct ff_effect * effect)25 static 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 
zpff_init(struct hid_device * hid)53 static 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
zpff_init(struct hid_device * hid)98 static inline int zpff_init(struct hid_device *hid)
99 {
100 	return 0;
101 }
102 #endif
103 
zp_probe(struct hid_device * hdev,const struct hid_device_id * id)104 static 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;
123 err:
124 	return ret;
125 }
126 
127 static 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 };
132 MODULE_DEVICE_TABLE(hid, zp_devices);
133 
134 static struct hid_driver zp_driver = {
135 	.name = "zeroplus",
136 	.id_table = zp_devices,
137 	.probe = zp_probe,
138 };
139 module_hid_driver(zp_driver);
140 
141 MODULE_LICENSE("GPL");
142