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hid-tmff.c

/*
 * 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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