]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/hid/hid-lg2ff.c
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[karo-tx-linux.git] / drivers / hid / hid-lg2ff.c
1 /*
2  *  Force feedback support for Logitech RumblePad and Rumblepad 2
3  *
4  *  Copyright (c) 2008 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/input.h>
25 #include <linux/slab.h>
26 #include <linux/hid.h>
27
28 #include "hid-lg.h"
29
30 struct lg2ff_device {
31         struct hid_report *report;
32 };
33
34 static int play_effect(struct input_dev *dev, void *data,
35                          struct ff_effect *effect)
36 {
37         struct hid_device *hid = input_get_drvdata(dev);
38         struct lg2ff_device *lg2ff = data;
39         int weak, strong;
40
41         strong = effect->u.rumble.strong_magnitude;
42         weak = effect->u.rumble.weak_magnitude;
43
44         if (weak || strong) {
45                 weak = weak * 0xff / 0xffff;
46                 strong = strong * 0xff / 0xffff;
47
48                 lg2ff->report->field[0]->value[0] = 0x51;
49                 lg2ff->report->field[0]->value[2] = weak;
50                 lg2ff->report->field[0]->value[4] = strong;
51         } else {
52                 lg2ff->report->field[0]->value[0] = 0xf3;
53                 lg2ff->report->field[0]->value[2] = 0x00;
54                 lg2ff->report->field[0]->value[4] = 0x00;
55         }
56
57         hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
58         return 0;
59 }
60
61 int lg2ff_init(struct hid_device *hid)
62 {
63         struct lg2ff_device *lg2ff;
64         struct hid_report *report;
65         struct hid_input *hidinput = list_entry(hid->inputs.next,
66                                                 struct hid_input, list);
67         struct list_head *report_list =
68                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
69         struct input_dev *dev = hidinput->input;
70         int error;
71
72         if (list_empty(report_list)) {
73                 hid_err(hid, "no output report found\n");
74                 return -ENODEV;
75         }
76
77         report = list_entry(report_list->next, struct hid_report, list);
78
79         if (report->maxfield < 1) {
80                 hid_err(hid, "output report is empty\n");
81                 return -ENODEV;
82         }
83         if (report->field[0]->report_count < 7) {
84                 hid_err(hid, "not enough values in the field\n");
85                 return -ENODEV;
86         }
87
88         lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
89         if (!lg2ff)
90                 return -ENOMEM;
91
92         set_bit(FF_RUMBLE, dev->ffbit);
93
94         error = input_ff_create_memless(dev, lg2ff, play_effect);
95         if (error) {
96                 kfree(lg2ff);
97                 return error;
98         }
99
100         lg2ff->report = report;
101         report->field[0]->value[0] = 0xf3;
102         report->field[0]->value[1] = 0x00;
103         report->field[0]->value[2] = 0x00;
104         report->field[0]->value[3] = 0x00;
105         report->field[0]->value[4] = 0x00;
106         report->field[0]->value[5] = 0x00;
107         report->field[0]->value[6] = 0x00;
108
109         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
110
111         hid_info(hid, "Force feedback for Logitech RumblePad/Rumblepad 2 by Anssi Hannula <anssi.hannula@gmail.com>\n");
112
113         return 0;
114 }