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/*
* Force feedback support for various HID compliant devices by ThrustMaster:
* ThrustMaster FireStorm Dual Power 2
* and possibly others whose device ids haven't been added.
*
* Modified to support ThrustMaster devices by Zinx Verituse
* on 2003-01-25 from the Logitech force feedback driver,
* which is by Johann Deneux.
*
* Copyright (c) 2003 Zinx Verituse <zinx@epicsol.org>
* Copyright (c) 2002 Johann Deneux
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/input.h>
#undef DEBUG
#include <linux/usb.h>
#include <linux/hid.h>
#include "usbhid.h"
/* Usages for thrustmaster devices I know about */
#define THRUSTMASTER_USAGE_FF (HID_UP_GENDESK | 0xbb)
struct dev_type {
u16 idVendor;
u16 idProduct;
const signed short *ff;
};
static const signed short ff_rumble[] = {
FF_RUMBLE,
-1
};
static const signed short ff_joystick[] = {
FF_CONSTANT,
-1
};
static const struct dev_type devices[] = {
{ 0x44f, 0xb300, ff_rumble },
{ 0x44f, 0xb304, ff_rumble },
{ 0x44f, 0xb651, ff_rumble }, /* FGT Rumble Force Wheel */
{ 0x44f, 0xb654, ff_joystick }, /* FGT Force Feedback Wheel */
};
struct tmff_device {
struct hid_report *report;
struct hid_field *ff_field;
};
/* Changes values from 0 to 0xffff into values from minimum to maximum */
static inline int hid_tmff_scale_u16(unsigned int in,
int minimum, int maximum)
{
int ret;
ret = (in * (maximum - minimum) / 0xffff) + minimum;
if (ret < minimum)
return minimum;
if (ret > maximum)
return maximum;
return ret;
}
/* Changes values from -0x80 to 0x7f into values from minimum to maximum */
static inline int hid_tmff_scale_s8(int in,
int minimum, int maximum)
{
int ret;
ret = (((in + 0x80) * (maximum - minimum)) / 0xff) + minimum;
if (ret < minimum)
return minimum;
if (ret > maximum)
return maximum;
return ret;
}
static int hid_tmff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
{
struct hid_device *hid = input_get_drvdata(dev);
struct tmff_device *tmff = data;
struct hid_field *ff_field = tmff->ff_field;
int x, y;
int left, right; /* Rumbling */
switch (effect->type) {
case FF_CONSTANT:
x = hid_tmff_scale_s8(effect->u.ramp.start_level,
ff_field->logical_minimum,
ff_field->logical_maximum);
y = hid_tmff_scale_s8(effect->u.ramp.end_level,
ff_field->logical_minimum,
ff_field->logical_maximum);
dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
ff_field->value[0] = x;
ff_field->value[1] = y;
usbhid_submit_report(hid, tmff->report, USB_DIR_OUT);
break;
case FF_RUMBLE:
left = hid_tmff_scale_u16(effect->u.rumble.weak_magnitude,
ff_field->logical_minimum,
ff_field->logical_maximum);
right = hid_tmff_scale_u16(effect->u.rumble.strong_magnitude,
ff_field->logical_minimum,
ff_field->logical_maximum);
dbg_hid("(left,right)=(%08x, %08x)\n", left, right);
ff_field->value[0] = left;
ff_field->value[1] = right;
usbhid_submit_report(hid, tmff->report, USB_DIR_OUT);
break;
}
return 0;
}
int hid_tmff_init(struct hid_device *hid)
{
struct tmff_device *tmff;
struct list_head *pos;
struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
struct input_dev *input_dev = hidinput->input;
const signed short *ff_bits = ff_joystick;
int error;
int i;
tmff = kzalloc(sizeof(struct tmff_device), GFP_KERNEL);
if (!tmff)
return -ENOMEM;
/* Find the report to use */
list_for_each(pos, &hid->report_enum[HID_OUTPUT_REPORT].report_list) {
struct hid_report *report = (struct hid_report *)pos;
int fieldnum;
for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
struct hid_field *field = report->field[fieldnum];
if (field->maxusage <= 0)
continue;
switch (field->usage[0].hid) {
case THRUSTMASTER_USAGE_FF:
if (field->report_count < 2) {
warn("ignoring FF field with report_count < 2");
continue;
}
if (field->logical_maximum == field->logical_minimum) {
warn("ignoring FF field with logical_maximum == logical_minimum");
continue;
}
if (tmff->report && tmff->report != report) {
warn("ignoring FF field in other report");
continue;
}
if (tmff->ff_field && tmff->ff_field != field) {
warn("ignoring duplicate FF field");
continue;
}
tmff->report = report;
tmff->ff_field = field;
for (i = 0; i < ARRAY_SIZE(devices); i++) {
if (input_dev->id.vendor == devices[i].idVendor &&
input_dev->id.product == devices[i].idProduct) {
ff_bits = devices[i].ff;
break;
}
}
for (i = 0; ff_bits[i] >= 0; i++)
set_bit(ff_bits[i], input_dev->ffbit);
break;
default:
warn("ignoring unknown output usage %08x", field->usage[0].hid);
continue;
}
}
}
if (!tmff->report) {
err("cant find FF field in output reports\n");
error = -ENODEV;
goto fail;
}
error = input_ff_create_memless(input_dev, tmff, hid_tmff_play);
if (error)
goto fail;
info("Force feedback for ThrustMaster devices by Zinx Verituse <zinx@epicsol.org>");
return 0;
fail:
kfree(tmff);
return error;
}
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