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hid-plff.c

/*
 *  Force feedback support for PantherLord/GreenAsia based devices
 *
 *  The devices are distributed under various names and the same USB device ID
 *  can be used in both adapters and actual game controllers.
 *
 *  0810:0001 "Twin USB Joystick"
 *   - tested with PantherLord USB/PS2 2in1 Adapter
 *   - contains two reports, one for each port (HID_QUIRK_MULTI_INPUT)
 *
 *  0e8f:0003 "GreenAsia Inc.    USB Joystick     "
 *   - tested with Köng Gaming gamepad
 *
 *  Copyright (c) 2007 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
 */


/* #define DEBUG */

#define debug(format, arg...) pr_debug("hid-plff: " format "\n" , ## arg)

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

struct plff_device {
      struct hid_report *report;
};

static int hid_plff_play(struct input_dev *dev, void *data,
                   struct ff_effect *effect)
{
      struct hid_device *hid = input_get_drvdata(dev);
      struct plff_device *plff = data;
      int left, right;

      left = effect->u.rumble.strong_magnitude;
      right = effect->u.rumble.weak_magnitude;
      debug("called with 0x%04x 0x%04x", left, right);

      left = left * 0x7f / 0xffff;
      right = right * 0x7f / 0xffff;

      plff->report->field[0]->value[2] = left;
      plff->report->field[0]->value[3] = right;
      debug("running with 0x%02x 0x%02x", left, right);
      usbhid_submit_report(hid, plff->report, USB_DIR_OUT);

      return 0;
}

int hid_plff_init(struct hid_device *hid)
{
      struct plff_device *plff;
      struct hid_report *report;
      struct hid_input *hidinput;
      struct list_head *report_list =
                  &hid->report_enum[HID_OUTPUT_REPORT].report_list;
      struct list_head *report_ptr = report_list;
      struct input_dev *dev;
      int error;

      /* The device contains one output report per physical device, all
         containing 1 field, which contains 4 ff00.0002 usages and 4 16bit
         absolute values.

         The input reports also contain a field which contains
         8 ff00.0001 usages and 8 boolean values. Their meaning is
         currently unknown. */

      if (list_empty(report_list)) {
            printk(KERN_ERR "hid-plff: no output reports found\n");
            return -ENODEV;
      }

      list_for_each_entry(hidinput, &hid->inputs, list) {

            report_ptr = report_ptr->next;

            if (report_ptr == report_list) {
                  printk(KERN_ERR "hid-plff: required output report is missing\n");
                  return -ENODEV;
            }

            report = list_entry(report_ptr, struct hid_report, list);
            if (report->maxfield < 1) {
                  printk(KERN_ERR "hid-plff: no fields in the report\n");
                  return -ENODEV;
            }

            if (report->field[0]->report_count < 4) {
                  printk(KERN_ERR "hid-plff: not enough values in the field\n");
                  return -ENODEV;
            }

            plff = kzalloc(sizeof(struct plff_device), GFP_KERNEL);
            if (!plff)
                  return -ENOMEM;

            dev = hidinput->input;

            set_bit(FF_RUMBLE, dev->ffbit);

            error = input_ff_create_memless(dev, plff, hid_plff_play);
            if (error) {
                  kfree(plff);
                  return error;
            }

            plff->report = report;
            plff->report->field[0]->value[0] = 0x00;
            plff->report->field[0]->value[1] = 0x00;
            plff->report->field[0]->value[2] = 0x00;
            plff->report->field[0]->value[3] = 0x00;
            usbhid_submit_report(hid, plff->report, USB_DIR_OUT);
      }

      printk(KERN_INFO "hid-plff: Force feedback for PantherLord/GreenAsia "
             "devices by Anssi Hannula <anssi.hannula@gmail.com>\n");

      return 0;
}

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