Merge branches 'x86/apic', 'x86/defconfig', 'x86/memtest', 'x86/mm' and 'linus' into...
[linux-2.6] / drivers / hid / hid-lg2ff.c
1 /*
2  *  Force feedback support for Logitech 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/usb.h>
26 #include <linux/hid.h>
27
28 #include "usbhid/usbhid.h"
29 #include "hid-lg.h"
30
31 struct lg2ff_device {
32         struct hid_report *report;
33 };
34
35 static int play_effect(struct input_dev *dev, void *data,
36                          struct ff_effect *effect)
37 {
38         struct hid_device *hid = input_get_drvdata(dev);
39         struct lg2ff_device *lg2ff = data;
40         int weak, strong;
41
42         strong = effect->u.rumble.strong_magnitude;
43         weak = effect->u.rumble.weak_magnitude;
44
45         if (weak || strong) {
46                 weak = weak * 0xff / 0xffff;
47                 strong = strong * 0xff / 0xffff;
48
49                 lg2ff->report->field[0]->value[0] = 0x51;
50                 lg2ff->report->field[0]->value[2] = weak;
51                 lg2ff->report->field[0]->value[4] = strong;
52         } else {
53                 lg2ff->report->field[0]->value[0] = 0xf3;
54                 lg2ff->report->field[0]->value[2] = 0x00;
55                 lg2ff->report->field[0]->value[4] = 0x00;
56         }
57
58         usbhid_submit_report(hid, lg2ff->report, USB_DIR_OUT);
59         return 0;
60 }
61
62 int lg2ff_init(struct hid_device *hid)
63 {
64         struct lg2ff_device *lg2ff;
65         struct hid_report *report;
66         struct hid_input *hidinput = list_entry(hid->inputs.next,
67                                                 struct hid_input, list);
68         struct list_head *report_list =
69                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
70         struct input_dev *dev = hidinput->input;
71         int error;
72
73         if (list_empty(report_list)) {
74                 dev_err(&hid->dev, "no output report found\n");
75                 return -ENODEV;
76         }
77
78         report = list_entry(report_list->next, struct hid_report, list);
79
80         if (report->maxfield < 1) {
81                 dev_err(&hid->dev, "output report is empty\n");
82                 return -ENODEV;
83         }
84         if (report->field[0]->report_count < 7) {
85                 dev_err(&hid->dev, "not enough values in the field\n");
86                 return -ENODEV;
87         }
88
89         lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
90         if (!lg2ff)
91                 return -ENOMEM;
92
93         set_bit(FF_RUMBLE, dev->ffbit);
94
95         error = input_ff_create_memless(dev, lg2ff, play_effect);
96         if (error) {
97                 kfree(lg2ff);
98                 return error;
99         }
100
101         lg2ff->report = report;
102         report->field[0]->value[0] = 0xf3;
103         report->field[0]->value[1] = 0x00;
104         report->field[0]->value[2] = 0x00;
105         report->field[0]->value[3] = 0x00;
106         report->field[0]->value[4] = 0x00;
107         report->field[0]->value[5] = 0x00;
108         report->field[0]->value[6] = 0x00;
109
110         usbhid_submit_report(hid, report, USB_DIR_OUT);
111
112         dev_info(&hid->dev, "Force feedback for Logitech Rumblepad 2 by "
113                "Anssi Hannula <anssi.hannula@gmail.com>\n");
114
115         return 0;
116 }