linux/drivers/hid/hid-lg2ff.c
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   1/*
   2 *  Force feedback support for Logitech RumblePad and Rumblepad 2
   3 *
   4 *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
   5 */
   6
   7/*
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21 */
  22
  23
  24#include <linux/input.h>
  25#include <linux/slab.h>
  26#include <linux/usb.h>
  27#include <linux/hid.h>
  28
  29#include "usbhid/usbhid.h"
  30#include "hid-lg.h"
  31
  32struct lg2ff_device {
  33        struct hid_report *report;
  34};
  35
  36static int play_effect(struct input_dev *dev, void *data,
  37                         struct ff_effect *effect)
  38{
  39        struct hid_device *hid = input_get_drvdata(dev);
  40        struct lg2ff_device *lg2ff = data;
  41        int weak, strong;
  42
  43        strong = effect->u.rumble.strong_magnitude;
  44        weak = effect->u.rumble.weak_magnitude;
  45
  46        if (weak || strong) {
  47                weak = weak * 0xff / 0xffff;
  48                strong = strong * 0xff / 0xffff;
  49
  50                lg2ff->report->field[0]->value[0] = 0x51;
  51                lg2ff->report->field[0]->value[2] = weak;
  52                lg2ff->report->field[0]->value[4] = strong;
  53        } else {
  54                lg2ff->report->field[0]->value[0] = 0xf3;
  55                lg2ff->report->field[0]->value[2] = 0x00;
  56                lg2ff->report->field[0]->value[4] = 0x00;
  57        }
  58
  59        usbhid_submit_report(hid, lg2ff->report, USB_DIR_OUT);
  60        return 0;
  61}
  62
  63int lg2ff_init(struct hid_device *hid)
  64{
  65        struct lg2ff_device *lg2ff;
  66        struct hid_report *report;
  67        struct hid_input *hidinput = list_entry(hid->inputs.next,
  68                                                struct hid_input, list);
  69        struct list_head *report_list =
  70                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  71        struct input_dev *dev = hidinput->input;
  72        int error;
  73
  74        if (list_empty(report_list)) {
  75                hid_err(hid, "no output report found\n");
  76                return -ENODEV;
  77        }
  78
  79        report = list_entry(report_list->next, struct hid_report, list);
  80
  81        if (report->maxfield < 1) {
  82                hid_err(hid, "output report is empty\n");
  83                return -ENODEV;
  84        }
  85        if (report->field[0]->report_count < 7) {
  86                hid_err(hid, "not enough values in the field\n");
  87                return -ENODEV;
  88        }
  89
  90        lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
  91        if (!lg2ff)
  92                return -ENOMEM;
  93
  94        set_bit(FF_RUMBLE, dev->ffbit);
  95
  96        error = input_ff_create_memless(dev, lg2ff, play_effect);
  97        if (error) {
  98                kfree(lg2ff);
  99                return error;
 100        }
 101
 102        lg2ff->report = report;
 103        report->field[0]->value[0] = 0xf3;
 104        report->field[0]->value[1] = 0x00;
 105        report->field[0]->value[2] = 0x00;
 106        report->field[0]->value[3] = 0x00;
 107        report->field[0]->value[4] = 0x00;
 108        report->field[0]->value[5] = 0x00;
 109        report->field[0]->value[6] = 0x00;
 110
 111        usbhid_submit_report(hid, report, USB_DIR_OUT);
 112
 113        hid_info(hid, "Force feedback for Logitech RumblePad/Rumblepad 2 by Anssi Hannula <anssi.hannula@gmail.com>\n");
 114
 115        return 0;
 116}
 117
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