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   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 <linux/hid.h>
  36 #include "usbhid.h"
  37
  38 /* Usages for thrustmaster devices I know about */
  39 #define THRUSTMASTER_USAGE_FF   (HID_UP_GENDESK | 0xbb)
  40
  41 struct dev_type {
  42         u16 idVendor;
  43         u16 idProduct;
  44         const signed short *ff;
  45 };
  46
  47 static const signed short ff_rumble[] = {
  48         FF_RUMBLE,
  49         -1
  50 };
  51
  52 static const signed short ff_joystick[] = {
  53         FF_CONSTANT,
  54         -1
  55 };
  56
  57 static const struct dev_type devices[] = {
  58         { 0x44f, 0xb300, ff_rumble },
  59         { 0x44f, 0xb304, ff_rumble },
  60         { 0x44f, 0xb651, ff_rumble },   /* FGT Rumble Force Wheel */
  61         { 0x44f, 0xb654, ff_joystick }, /* FGT Force Feedback Wheel */
  62 };
  63
  64 struct tmff_device {
  65         struct hid_report *report;
  66         struct hid_field *ff_field;
  67 };
  68
  69 /* Changes values from 0 to 0xffff into values from minimum to maximum */
  70 static inline int hid_tmff_scale_u16(unsigned int in,
  71                                 int minimum, int maximum)
  72 {
  73         int ret;
  74
  75         ret = (in * (maximum - minimum) / 0xffff) + minimum;
  76         if (ret < minimum)
  77                 return minimum;
  78         if (ret > maximum)
  79                 return maximum;
  80         return ret;
  81 }
  82
  83 /* Changes values from -0x80 to 0x7f into values from minimum to maximum */
  84 static inline int hid_tmff_scale_s8(int in,
  85                                     int minimum, int maximum)
  86 {
  87         int ret;
  88
  89         ret = (((in + 0x80) * (maximum - minimum)) / 0xff) + minimum;
  90         if (ret < minimum)
  91                 return minimum;
  92         if (ret > maximum)
  93                 return maximum;
  94         return ret;
  95 }
  96
  97 static int hid_tmff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  98 {
  99         struct hid_device *hid = input_get_drvdata(dev);
 100         struct tmff_device *tmff = data;
 101         struct hid_field *ff_field = tmff->ff_field;
 102         int x, y;
 103         int left, right;        /* Rumbling */
 104
 105         switch (effect->type) {
 106         case FF_CONSTANT:
 107                 x = hid_tmff_scale_s8(effect->u.ramp.start_level,
 108                                         ff_field->logical_minimum,
 109                                         ff_field->logical_maximum);
 110                 y = hid_tmff_scale_s8(effect->u.ramp.end_level,
 111                                         ff_field->logical_minimum,
 112                                         ff_field->logical_maximum);
 113
 114                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
 115                 ff_field->value[0] = x;
 116                 ff_field->value[1] = y;
 117                 usbhid_submit_report(hid, tmff->report, USB_DIR_OUT);
 118                 break;
 119
 120         case FF_RUMBLE:
 121                 left = hid_tmff_scale_u16(effect->u.rumble.weak_magnitude,
 122                                         ff_field->logical_minimum,
 123                                         ff_field->logical_maximum);
 124                 right = hid_tmff_scale_u16(effect->u.rumble.strong_magnitude,
 125                                         ff_field->logical_minimum,
 126                                         ff_field->logical_maximum);
 127
 128                 dbg_hid("(left,right)=(%08x, %08x)\n", left, right);
 129                 ff_field->value[0] = left;
 130                 ff_field->value[1] = right;
 131                 usbhid_submit_report(hid, tmff->report, USB_DIR_OUT);
 132                 break;
 133         }
 134         return 0;
 135 }
 136
 137 int hid_tmff_init(struct hid_device *hid)
 138 {
 139         struct tmff_device *tmff;
 140         struct hid_report *report;
 141         struct list_head *report_list;
 142         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 143         struct input_dev *input_dev = hidinput->input;
 144         const signed short *ff_bits = ff_joystick;
 145         int error;
 146         int i;
 147
 148         tmff = kzalloc(sizeof(struct tmff_device), GFP_KERNEL);
 149         if (!tmff)
 150                 return -ENOMEM;
 151
 152         /* Find the report to use */
 153         report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 154         list_for_each_entry(report, report_list, list) {
 155                 int fieldnum;
 156
 157                 for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
 158                         struct hid_field *field = report->field[fieldnum];
 159
 160                         if (field->maxusage <= 0)
 161                                 continue;
 162
 163                         switch (field->usage[0].hid) {
 164                         case THRUSTMASTER_USAGE_FF:
 165                                 if (field->report_count < 2) {
 166                                         warn("ignoring FF field with report_count < 2");
 167                                         continue;
 168                                 }
 169
 170                                 if (field->logical_maximum == field->logical_minimum) {
 171                                         warn("ignoring FF field with logical_maximum == logical_minimum");
 172                                         continue;
 173                                 }
 174
 175                                 if (tmff->report && tmff->report != report) {
 176                                         warn("ignoring FF field in other report");
 177                                         continue;
 178                                 }
 179
 180                                 if (tmff->ff_field && tmff->ff_field != field) {
 181                                         warn("ignoring duplicate FF field");
 182                                         continue;
 183                                 }
 184
 185                                 tmff->report = report;
 186                                 tmff->ff_field = field;
 187
 188                                 for (i = 0; i < ARRAY_SIZE(devices); i++) {
 189                                         if (input_dev->id.vendor == devices[i].idVendor &&
 190                                             input_dev->id.product == devices[i].idProduct) {
 191                                                 ff_bits = devices[i].ff;
 192                                                 break;
 193                                         }
 194                                 }
 195
 196                                 for (i = 0; ff_bits[i] >= 0; i++)
 197                                         set_bit(ff_bits[i], input_dev->ffbit);
 198
 199                                 break;
 200
 201                         default:
 202                                 warn("ignoring unknown output usage %08x", field->usage[0].hid);
 203                                 continue;
 204                         }
 205                 }
 206         }
 207
 208         if (!tmff->report) {
 209                 err("cant find FF field in output reports\n");
 210                 error = -ENODEV;
 211                 goto fail;
 212         }
 213
 214         error = input_ff_create_memless(input_dev, tmff, hid_tmff_play);
 215         if (error)
 216                 goto fail;
 217
 218         info("Force feedback for ThrustMaster devices by Zinx Verituse <zinx@epicsol.org>");
 219         return 0;
 220
 221  fail:
 222         kfree(tmff);
 223         return error;
 224 }
 225