tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 = list_entry(hid->inputs.next,
58 struct hid_input, list);
59 struct input_dev *dev = hidinput->input;
60 int i, error;
61
62 for (i = 0; i < 4; i++) {
63 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
64 if (!report)
65 return -ENODEV;
66 }
67
68 zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
69 if (!zpff)
70 return -ENOMEM;
71
72 set_bit(FF_RUMBLE, dev->ffbit);
73
74 error = input_ff_create_memless(dev, zpff, zpff_play);
75 if (error) {
76 kfree(zpff);
77 return error;
78 }
79
80 zpff->report = report;
81 zpff->report->field[0]->value[0] = 0x00;
82 zpff->report->field[1]->value[0] = 0x02;
83 zpff->report->field[2]->value[0] = 0x00;
84 zpff->report->field[3]->value[0] = 0x00;
85 hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
86
87 hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
88
89 return 0;
90}
91#else
92static inline int zpff_init(struct hid_device *hid)
93{
94 return 0;
95}
96#endif
97
98static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
99{
100 int ret;
101
102 ret = hid_parse(hdev);
103 if (ret) {
104 hid_err(hdev, "parse failed\n");
105 goto err;
106 }
107
108 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
109 if (ret) {
110 hid_err(hdev, "hw start failed\n");
111 goto err;
112 }
113
114 zpff_init(hdev);
115
116 return 0;
117err:
118 return ret;
119}
120
121static const struct hid_device_id zp_devices[] = {
122 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
123 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
124 { }
125};
126MODULE_DEVICE_TABLE(hid, zp_devices);
127
128static struct hid_driver zp_driver = {
129 .name = "zeroplus",
130 .id_table = zp_devices,
131 .probe = zp_probe,
132};
133module_hid_driver(zp_driver);
134
135MODULE_LICENSE("GPL");