tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Force feedback support for Zeroplus based devices
3 *
4 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
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
30#include "usbhid/usbhid.h"
31
32struct zpff_device {
33 struct hid_report *report;
34};
35
36static int zpff_play(struct input_dev *dev, void *data,
37 struct ff_effect *effect)
38{
39 struct hid_device *hid = input_get_drvdata(dev);
40 struct zpff_device *zpff = data;
41 int left, right;
42
43 /*
44 * The following is specified the other way around in the Zeroplus
45 * datasheet but the order below is correct for the XFX Executioner;
46 * however it is possible that the XFX Executioner is an exception
47 */
48
49 left = effect->u.rumble.strong_magnitude;
50 right = effect->u.rumble.weak_magnitude;
51 dbg_hid("called with 0x%04x 0x%04x\n", left, right);
52
53 left = left * 0x7f / 0xffff;
54 right = right * 0x7f / 0xffff;
55
56 zpff->report->field[2]->value[0] = left;
57 zpff->report->field[3]->value[0] = right;
58 dbg_hid("running with 0x%02x 0x%02x\n", left, right);
59 usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
60
61 return 0;
62}
63
64static int zpff_init(struct hid_device *hid)
65{
66 struct zpff_device *zpff;
67 struct hid_report *report;
68 struct hid_input *hidinput = list_entry(hid->inputs.next,
69 struct hid_input, list);
70 struct list_head *report_list =
71 &hid->report_enum[HID_OUTPUT_REPORT].report_list;
72 struct input_dev *dev = hidinput->input;
73 int error;
74
75 if (list_empty(report_list)) {
76 dev_err(&hid->dev, "no output report found\n");
77 return -ENODEV;
78 }
79
80 report = list_entry(report_list->next, struct hid_report, list);
81
82 if (report->maxfield < 4) {
83 dev_err(&hid->dev, "not enough fields in report\n");
84 return -ENODEV;
85 }
86
87 zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
88 if (!zpff)
89 return -ENOMEM;
90
91 set_bit(FF_RUMBLE, dev->ffbit);
92
93 error = input_ff_create_memless(dev, zpff, zpff_play);
94 if (error) {
95 kfree(zpff);
96 return error;
97 }
98
99 zpff->report = report;
100 zpff->report->field[0]->value[0] = 0x00;
101 zpff->report->field[1]->value[0] = 0x02;
102 zpff->report->field[2]->value[0] = 0x00;
103 zpff->report->field[3]->value[0] = 0x00;
104 usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
105
106 dev_info(&hid->dev, "force feedback for Zeroplus based devices by "
107 "Anssi Hannula <anssi.hannula@gmail.com>\n");
108
109 return 0;
110}
111
112static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
113{
114 int ret;
115
116 ret = hid_parse(hdev);
117 if (ret) {
118 dev_err(&hdev->dev, "parse failed\n");
119 goto err;
120 }
121
122 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
123 if (ret) {
124 dev_err(&hdev->dev, "hw start failed\n");
125 goto err;
126 }
127
128 zpff_init(hdev);
129
130 return 0;
131err:
132 return ret;
133}
134
135static const struct hid_device_id zp_devices[] = {
136 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
137 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
138 { }
139};
140MODULE_DEVICE_TABLE(hid, zp_devices);
141
142static struct hid_driver zp_driver = {
143 .name = "zeroplus",
144 .id_table = zp_devices,
145 .probe = zp_probe,
146};
147
148static int zp_init(void)
149{
150 return hid_register_driver(&zp_driver);
151}
152
153static void zp_exit(void)
154{
155 hid_unregister_driver(&zp_driver);
156}
157
158module_init(zp_init);
159module_exit(zp_exit);
160MODULE_LICENSE("GPL");