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hid-zpff.c

/*
 *  Force feedback support for Zeroplus based devices
 *
 *  Copyright (c) 2005, 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
 */


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

struct zpff_device {
      struct hid_report *report;
};

static int hid_zpff_play(struct input_dev *dev, void *data,
                   struct ff_effect *effect)
{
      struct hid_device *hid = input_get_drvdata(dev);
      struct zpff_device *zpff = data;
      int left, right;

      /*
       * The following is specified the other way around in the Zeroplus
       * datasheet but the order below is correct for the XFX Executioner;
       * however it is possible that the XFX Executioner is an exception
       */

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

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

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

      return 0;
}

int hid_zpff_init(struct hid_device *hid)
{
      struct zpff_device *zpff;
      struct hid_report *report;
      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;
      int error;

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

      report = list_entry(report_list->next, struct hid_report, list);

      if (report->maxfield < 4) {
            printk(KERN_ERR "hid-zpff: not enough fields in report\n");
            return -ENODEV;
      }

      zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
      if (!zpff)
            return -ENOMEM;

      set_bit(FF_RUMBLE, dev->ffbit);

      error = input_ff_create_memless(dev, zpff, hid_zpff_play);
      if (error) {
            kfree(zpff);
            return error;
      }

      zpff->report = report;
      zpff->report->field[0]->value[0] = 0x00;
      zpff->report->field[1]->value[0] = 0x02;
      zpff->report->field[2]->value[0] = 0x00;
      zpff->report->field[3]->value[0] = 0x00;
      usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);

      printk(KERN_INFO "Force feedback for Zeroplus based devices by "
             "Anssi Hannula <anssi.hannula@gmail.com>\n");

      return 0;
}

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