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/* #define DEBUG */
25
26#define debug(format, arg...) pr_debug("hid-zpff: " format "\n" , ## arg)
27
28#include <linux/input.h>
29#include <linux/usb.h>
30#include <linux/hid.h>
31#include "usbhid.h"
32
33struct zpff_device {
34 struct hid_report *report;
35};
36
37static int hid_zpff_play(struct input_dev *dev, void *data,
38 struct ff_effect *effect)
39{
40 struct hid_device *hid = dev->private;
41 struct zpff_device *zpff = data;
42 int left, right;
43
44 /*
45 * The following is specified the other way around in the Zeroplus
46 * datasheet but the order below is correct for the XFX Executioner;
47 * however it is possible that the XFX Executioner is an exception
48 */
49
50 left = effect->u.rumble.strong_magnitude;
51 right = effect->u.rumble.weak_magnitude;
52 debug("called with 0x%04x 0x%04x", left, right);
53
54 left = left * 0x7f / 0xffff;
55 right = right * 0x7f / 0xffff;
56
57 zpff->report->field[2]->value[0] = left;
58 zpff->report->field[3]->value[0] = right;
59 debug("running with 0x%02x 0x%02x", left, right);
60 usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
61
62 return 0;
63}
64
65int hid_zpff_init(struct hid_device *hid)
66{
67 struct zpff_device *zpff;
68 struct hid_report *report;
69 struct hid_input *hidinput = list_entry(hid->inputs.next,
70 struct hid_input, list);
71 struct list_head *report_list =
72 &hid->report_enum[HID_OUTPUT_REPORT].report_list;
73 struct input_dev *dev = hidinput->input;
74 int error;
75
76 if (list_empty(report_list)) {
77 printk(KERN_ERR "hid-zpff: no output report found\n");
78 return -ENODEV;
79 }
80
81 report = list_entry(report_list->next, struct hid_report, list);
82
83 if (report->maxfield < 4) {
84 printk(KERN_ERR "hid-zpff: not enough fields in report\n");
85 return -ENODEV;
86 }
87
88 zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
89 if (!zpff)
90 return -ENOMEM;
91
92 set_bit(FF_RUMBLE, dev->ffbit);
93
94 error = input_ff_create_memless(dev, zpff, hid_zpff_play);
95 if (error) {
96 kfree(zpff);
97 return error;
98 }
99
100 zpff->report = report;
101 zpff->report->field[0]->value[0] = 0x00;
102 zpff->report->field[1]->value[0] = 0x02;
103 zpff->report->field[2]->value[0] = 0x00;
104 zpff->report->field[3]->value[0] = 0x00;
105 usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
106
107 printk(KERN_INFO "Force feedback for Zeroplus based devices by "
108 "Anssi Hannula <anssi.hannula@gmail.com>\n");
109
110 return 0;
111}