Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
04561c5a IF |
2 | /* |
3 | * Force feedback support for EMS Trio Linker Plus II | |
4 | * | |
5 | * Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de> | |
6 | */ | |
7 | ||
8 | /* | |
04561c5a IF |
9 | */ |
10 | ||
11 | ||
12 | #include <linux/hid.h> | |
13 | #include <linux/input.h> | |
8f86a2c3 | 14 | #include <linux/module.h> |
04561c5a IF |
15 | |
16 | #include "hid-ids.h" | |
04561c5a IF |
17 | |
18 | struct emsff_device { | |
19 | struct hid_report *report; | |
20 | }; | |
21 | ||
22 | static int emsff_play(struct input_dev *dev, void *data, | |
23 | struct ff_effect *effect) | |
24 | { | |
25 | struct hid_device *hid = input_get_drvdata(dev); | |
26 | struct emsff_device *emsff = data; | |
27 | int weak, strong; | |
28 | ||
29 | weak = effect->u.rumble.weak_magnitude; | |
30 | strong = effect->u.rumble.strong_magnitude; | |
31 | ||
32 | dbg_hid("called with 0x%04x 0x%04x\n", strong, weak); | |
33 | ||
34 | weak = weak * 0xff / 0xffff; | |
35 | strong = strong * 0xff / 0xffff; | |
36 | ||
37 | emsff->report->field[0]->value[1] = weak; | |
38 | emsff->report->field[0]->value[2] = strong; | |
39 | ||
40 | dbg_hid("running with 0x%02x 0x%02x\n", strong, weak); | |
d8814272 | 41 | hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); |
04561c5a IF |
42 | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int emsff_init(struct hid_device *hid) | |
47 | { | |
48 | struct emsff_device *emsff; | |
49 | struct hid_report *report; | |
d9d4b1e4 | 50 | struct hid_input *hidinput; |
04561c5a IF |
51 | struct list_head *report_list = |
52 | &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
d9d4b1e4 | 53 | struct input_dev *dev; |
04561c5a IF |
54 | int error; |
55 | ||
d9d4b1e4 AS |
56 | if (list_empty(&hid->inputs)) { |
57 | hid_err(hid, "no inputs found\n"); | |
58 | return -ENODEV; | |
59 | } | |
60 | hidinput = list_first_entry(&hid->inputs, struct hid_input, list); | |
61 | dev = hidinput->input; | |
62 | ||
04561c5a | 63 | if (list_empty(report_list)) { |
4291ee30 | 64 | hid_err(hid, "no output reports found\n"); |
04561c5a IF |
65 | return -ENODEV; |
66 | } | |
67 | ||
68 | report = list_first_entry(report_list, struct hid_report, list); | |
69 | if (report->maxfield < 1) { | |
4291ee30 | 70 | hid_err(hid, "no fields in the report\n"); |
04561c5a IF |
71 | return -ENODEV; |
72 | } | |
73 | ||
74 | if (report->field[0]->report_count < 7) { | |
4291ee30 | 75 | hid_err(hid, "not enough values in the field\n"); |
04561c5a IF |
76 | return -ENODEV; |
77 | } | |
78 | ||
79 | emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL); | |
80 | if (!emsff) | |
81 | return -ENOMEM; | |
82 | ||
83 | set_bit(FF_RUMBLE, dev->ffbit); | |
84 | ||
85 | error = input_ff_create_memless(dev, emsff, emsff_play); | |
86 | if (error) { | |
87 | kfree(emsff); | |
88 | return error; | |
89 | } | |
90 | ||
91 | emsff->report = report; | |
92 | emsff->report->field[0]->value[0] = 0x01; | |
93 | emsff->report->field[0]->value[1] = 0x00; | |
94 | emsff->report->field[0]->value[2] = 0x00; | |
95 | emsff->report->field[0]->value[3] = 0x00; | |
96 | emsff->report->field[0]->value[4] = 0x00; | |
97 | emsff->report->field[0]->value[5] = 0x00; | |
98 | emsff->report->field[0]->value[6] = 0x00; | |
d8814272 | 99 | hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); |
04561c5a | 100 | |
4291ee30 | 101 | hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n"); |
04561c5a IF |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
107 | { | |
108 | int ret; | |
109 | ||
110 | ret = hid_parse(hdev); | |
111 | if (ret) { | |
4291ee30 | 112 | hid_err(hdev, "parse failed\n"); |
04561c5a IF |
113 | goto err; |
114 | } | |
115 | ||
116 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); | |
117 | if (ret) { | |
4291ee30 | 118 | hid_err(hdev, "hw start failed\n"); |
04561c5a IF |
119 | goto err; |
120 | } | |
121 | ||
2dcd9543 AL |
122 | ret = emsff_init(hdev); |
123 | if (ret) { | |
124 | dev_err(&hdev->dev, "force feedback init failed\n"); | |
125 | hid_hw_stop(hdev); | |
126 | goto err; | |
127 | } | |
04561c5a IF |
128 | |
129 | return 0; | |
130 | err: | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static const struct hid_device_id ems_devices[] = { | |
05ee2838 | 135 | { HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) }, |
04561c5a IF |
136 | { } |
137 | }; | |
138 | MODULE_DEVICE_TABLE(hid, ems_devices); | |
139 | ||
140 | static struct hid_driver ems_driver = { | |
141 | .name = "hkems", | |
142 | .id_table = ems_devices, | |
143 | .probe = ems_probe, | |
144 | }; | |
f425458e | 145 | module_hid_driver(ems_driver); |
04561c5a | 146 | |
04561c5a IF |
147 | MODULE_LICENSE("GPL"); |
148 |