Commit | Line | Data |
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04561c5a IF |
1 | /* |
2 | * Force feedback support for EMS Trio Linker Plus II | |
3 | * | |
4 | * Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de> | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | ||
24 | #include <linux/hid.h> | |
25 | #include <linux/input.h> | |
26 | #include <linux/usb.h> | |
27 | ||
28 | #include "hid-ids.h" | |
29 | #include "usbhid/usbhid.h" | |
30 | ||
31 | struct emsff_device { | |
32 | struct hid_report *report; | |
33 | }; | |
34 | ||
35 | static int emsff_play(struct input_dev *dev, void *data, | |
36 | struct ff_effect *effect) | |
37 | { | |
38 | struct hid_device *hid = input_get_drvdata(dev); | |
39 | struct emsff_device *emsff = data; | |
40 | int weak, strong; | |
41 | ||
42 | weak = effect->u.rumble.weak_magnitude; | |
43 | strong = effect->u.rumble.strong_magnitude; | |
44 | ||
45 | dbg_hid("called with 0x%04x 0x%04x\n", strong, weak); | |
46 | ||
47 | weak = weak * 0xff / 0xffff; | |
48 | strong = strong * 0xff / 0xffff; | |
49 | ||
50 | emsff->report->field[0]->value[1] = weak; | |
51 | emsff->report->field[0]->value[2] = strong; | |
52 | ||
53 | dbg_hid("running with 0x%02x 0x%02x\n", strong, weak); | |
54 | usbhid_submit_report(hid, emsff->report, USB_DIR_OUT); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | static int emsff_init(struct hid_device *hid) | |
60 | { | |
61 | struct emsff_device *emsff; | |
62 | struct hid_report *report; | |
63 | struct hid_input *hidinput = list_first_entry(&hid->inputs, | |
64 | struct hid_input, list); | |
65 | struct list_head *report_list = | |
66 | &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
67 | struct input_dev *dev = hidinput->input; | |
68 | int error; | |
69 | ||
70 | if (list_empty(report_list)) { | |
4291ee30 | 71 | hid_err(hid, "no output reports found\n"); |
04561c5a IF |
72 | return -ENODEV; |
73 | } | |
74 | ||
75 | report = list_first_entry(report_list, struct hid_report, list); | |
76 | if (report->maxfield < 1) { | |
4291ee30 | 77 | hid_err(hid, "no fields in the report\n"); |
04561c5a IF |
78 | return -ENODEV; |
79 | } | |
80 | ||
81 | if (report->field[0]->report_count < 7) { | |
4291ee30 | 82 | hid_err(hid, "not enough values in the field\n"); |
04561c5a IF |
83 | return -ENODEV; |
84 | } | |
85 | ||
86 | emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL); | |
87 | if (!emsff) | |
88 | return -ENOMEM; | |
89 | ||
90 | set_bit(FF_RUMBLE, dev->ffbit); | |
91 | ||
92 | error = input_ff_create_memless(dev, emsff, emsff_play); | |
93 | if (error) { | |
94 | kfree(emsff); | |
95 | return error; | |
96 | } | |
97 | ||
98 | emsff->report = report; | |
99 | emsff->report->field[0]->value[0] = 0x01; | |
100 | emsff->report->field[0]->value[1] = 0x00; | |
101 | emsff->report->field[0]->value[2] = 0x00; | |
102 | emsff->report->field[0]->value[3] = 0x00; | |
103 | emsff->report->field[0]->value[4] = 0x00; | |
104 | emsff->report->field[0]->value[5] = 0x00; | |
105 | emsff->report->field[0]->value[6] = 0x00; | |
106 | usbhid_submit_report(hid, emsff->report, USB_DIR_OUT); | |
107 | ||
4291ee30 | 108 | hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n"); |
04561c5a IF |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
114 | { | |
115 | int ret; | |
116 | ||
117 | ret = hid_parse(hdev); | |
118 | if (ret) { | |
4291ee30 | 119 | hid_err(hdev, "parse failed\n"); |
04561c5a IF |
120 | goto err; |
121 | } | |
122 | ||
123 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); | |
124 | if (ret) { | |
4291ee30 | 125 | hid_err(hdev, "hw start failed\n"); |
04561c5a IF |
126 | goto err; |
127 | } | |
128 | ||
2dcd9543 AL |
129 | ret = emsff_init(hdev); |
130 | if (ret) { | |
131 | dev_err(&hdev->dev, "force feedback init failed\n"); | |
132 | hid_hw_stop(hdev); | |
133 | goto err; | |
134 | } | |
04561c5a IF |
135 | |
136 | return 0; | |
137 | err: | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static const struct hid_device_id ems_devices[] = { | |
142 | { HID_USB_DEVICE(USB_VENDOR_ID_EMS, 0x118) }, | |
143 | { } | |
144 | }; | |
145 | MODULE_DEVICE_TABLE(hid, ems_devices); | |
146 | ||
147 | static struct hid_driver ems_driver = { | |
148 | .name = "hkems", | |
149 | .id_table = ems_devices, | |
150 | .probe = ems_probe, | |
151 | }; | |
152 | ||
153 | static int ems_init(void) | |
154 | { | |
155 | return hid_register_driver(&ems_driver); | |
156 | } | |
157 | ||
158 | static void ems_exit(void) | |
159 | { | |
160 | hid_unregister_driver(&ems_driver); | |
161 | } | |
162 | ||
163 | module_init(ems_init); | |
164 | module_exit(ems_exit); | |
165 | MODULE_LICENSE("GPL"); | |
166 |