Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / drivers / usb / input / hid-tmff.c
1 /*
2  * Force feedback support for various HID compliant devices by ThrustMaster:
3  *    ThrustMaster FireStorm Dual Power 2
4  * and possibly others whose device ids haven't been added.
5  *
6  *  Modified to support ThrustMaster devices by Zinx Verituse
7  *  on 2003-01-25 from the Logitech force feedback driver,
8  *  which is by Johann Deneux.
9  *
10  *  Copyright (c) 2003 Zinx Verituse <zinx@epicsol.org>
11  *  Copyright (c) 2002 Johann Deneux
12  */
13
14 /*
15  * This program is free software; you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation; either version 2 of the License, or
18  * (at your option) any later version.
19  *
20  * This program is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23  * GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, write to the Free Software
27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28  */
29
30 #include <linux/input.h>
31
32 #undef DEBUG
33 #include <linux/usb.h>
34
35 #include "hid.h"
36
37 /* Usages for thrustmaster devices I know about */
38 #define THRUSTMASTER_USAGE_RUMBLE_LR    (HID_UP_GENDESK | 0xbb)
39
40
41 struct tmff_device {
42         struct hid_report *report;
43         struct hid_field *rumble;
44 };
45
46 /* Changes values from 0 to 0xffff into values from minimum to maximum */
47 static inline int hid_tmff_scale(unsigned int in, int minimum, int maximum)
48 {
49         int ret;
50
51         ret = (in * (maximum - minimum) / 0xffff) + minimum;
52         if (ret < minimum)
53                 return minimum;
54         if (ret > maximum)
55                 return maximum;
56         return ret;
57 }
58
59 static int hid_tmff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
60 {
61         struct hid_device *hid = dev->private;
62         struct tmff_device *tmff = data;
63         int left, right;        /* Rumbling */
64
65         left = hid_tmff_scale(effect->u.rumble.weak_magnitude,
66                 tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
67         right = hid_tmff_scale(effect->u.rumble.strong_magnitude,
68                 tmff->rumble->logical_minimum, tmff->rumble->logical_maximum);
69
70         tmff->rumble->value[0] = left;
71         tmff->rumble->value[1] = right;
72         dbg("(left,right)=(%08x, %08x)", left, right);
73         hid_submit_report(hid, tmff->report, USB_DIR_OUT);
74
75         return 0;
76 }
77
78 int hid_tmff_init(struct hid_device *hid)
79 {
80         struct tmff_device *tmff;
81         struct list_head *pos;
82         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
83         struct input_dev *input_dev = hidinput->input;
84         int error;
85
86         tmff = kzalloc(sizeof(struct tmff_device), GFP_KERNEL);
87         if (!tmff)
88                 return -ENOMEM;
89
90         /* Find the report to use */
91         __list_for_each(pos, &hid->report_enum[HID_OUTPUT_REPORT].report_list) {
92                 struct hid_report *report = (struct hid_report *)pos;
93                 int fieldnum;
94
95                 for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
96                         struct hid_field *field = report->field[fieldnum];
97
98                         if (field->maxusage <= 0)
99                                 continue;
100
101                         switch (field->usage[0].hid) {
102                                 case THRUSTMASTER_USAGE_RUMBLE_LR:
103                                         if (field->report_count < 2) {
104                                                 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with report_count < 2");
105                                                 continue;
106                                         }
107
108                                         if (field->logical_maximum == field->logical_minimum) {
109                                                 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR with logical_maximum == logical_minimum");
110                                                 continue;
111                                         }
112
113                                         if (tmff->report && tmff->report != report) {
114                                                 warn("ignoring THRUSTMASTER_USAGE_RUMBLE_LR in other report");
115                                                 continue;
116                                         }
117
118                                         if (tmff->rumble && tmff->rumble != field) {
119                                                 warn("ignoring duplicate THRUSTMASTER_USAGE_RUMBLE_LR");
120                                                 continue;
121                                         }
122
123                                         tmff->report = report;
124                                         tmff->rumble = field;
125
126                                         set_bit(FF_RUMBLE, input_dev->ffbit);
127                                         break;
128
129                                 default:
130                                         warn("ignoring unknown output usage %08x", field->usage[0].hid);
131                                         continue;
132                         }
133                 }
134         }
135
136         error = input_ff_create_memless(input_dev, tmff, hid_tmff_play);
137         if (error) {
138                 kfree(tmff);
139                 return error;
140         }
141
142         info("Force feedback for ThrustMaster rumble pad devices by Zinx Verituse <zinx@epicsol.org>");
143
144         return 0;
145 }
146