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hid-lgff.c

/*
 * Force feedback support for hid-compliant for some of the devices from
 * Logitech, namely:
 * - WingMan Cordless RumblePad
 * - WingMan Force 3D
 *
 *  Copyright (c) 2002-2004 Johann Deneux
 *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
 */

/*
 * 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
 *
 * Should you need to contact me, the author, you can do so by
 * e-mail - mail your message to <johann.deneux@it.uu.se>
 */

#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include "usbhid.h"

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[] = {
      { 0x046d, 0xc211, ff_rumble },
      { 0x046d, 0xc219, ff_rumble },
      { 0x046d, 0xc283, ff_joystick },
      { 0x046d, 0xc286, ff_joystick },
      { 0x046d, 0xc294, ff_joystick },
      { 0x046d, 0xc295, ff_joystick },
      { 0x046d, 0xca03, ff_joystick },
};

static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
{
      struct hid_device *hid = input_get_drvdata(dev);
      struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
      struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
      int x, y;
      unsigned int left, right;

#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff

      switch (effect->type) {
      case FF_CONSTANT:
            x = effect->u.ramp.start_level + 0x7f;    /* 0x7f is center */
            y = effect->u.ramp.end_level + 0x7f;
            CLAMP(x);
            CLAMP(y);
            report->field[0]->value[0] = 0x51;
            report->field[0]->value[1] = 0x08;
            report->field[0]->value[2] = x;
            report->field[0]->value[3] = y;
            dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
            usbhid_submit_report(hid, report, USB_DIR_OUT);
            break;

      case FF_RUMBLE:
            right = effect->u.rumble.strong_magnitude;
            left = effect->u.rumble.weak_magnitude;
            right = right * 0xff / 0xffff;
            left = left * 0xff / 0xffff;
            CLAMP(left);
            CLAMP(right);
            report->field[0]->value[0] = 0x42;
            report->field[0]->value[1] = 0x00;
            report->field[0]->value[2] = left;
            report->field[0]->value[3] = right;
            dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
            usbhid_submit_report(hid, report, USB_DIR_OUT);
            break;
      }
      return 0;
}

int hid_lgff_init(struct hid_device* hid)
{
      struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
      struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
      struct input_dev *dev = hidinput->input;
      struct hid_report *report;
      struct hid_field *field;
      const signed short *ff_bits = ff_joystick;
      int error;
      int i;

      /* Find the report to use */
      if (list_empty(report_list)) {
            err_hid("No output report found");
            return -1;
      }

      /* Check that the report looks ok */
      report = list_entry(report_list->next, struct hid_report, list);
      if (!report) {
            err_hid("NULL output report");
            return -1;
      }

      field = report->field[0];
      if (!field) {
            err_hid("NULL field");
            return -1;
      }

      for (i = 0; i < ARRAY_SIZE(devices); i++) {
            if (dev->id.vendor == devices[i].idVendor &&
                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], dev->ffbit);

      error = input_ff_create_memless(dev, NULL, hid_lgff_play);
      if (error)
            return error;

      printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");

      return 0;
}

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