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