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/hid.h>
  27
  28#include "hid-lg.h"
  29
  30struct lg2ff_device {
  31        struct hid_report *report;
  32};
  33
  34static int play_effect(struct input_dev *dev, void *data,
  35                         struct ff_effect *effect)
  36{
  37        struct hid_device *hid = input_get_drvdata(dev);
  38        struct lg2ff_device *lg2ff = data;
  39        int weak, strong;
  40
  41        strong = effect->u.rumble.strong_magnitude;
  42        weak = effect->u.rumble.weak_magnitude;
  43
  44        if (weak || strong) {
  45                weak = weak * 0xff / 0xffff;
  46                strong = strong * 0xff / 0xffff;
  47
  48                lg2ff->report->field[0]->value[0] = 0x51;
  49                lg2ff->report->field[0]->value[2] = weak;
  50                lg2ff->report->field[0]->value[4] = strong;
  51        } else {
  52                lg2ff->report->field[0]->value[0] = 0xf3;
  53                lg2ff->report->field[0]->value[2] = 0x00;
  54                lg2ff->report->field[0]->value[4] = 0x00;
  55        }
  56
  57        hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
  58        return 0;
  59}
  60
  61int lg2ff_init(struct hid_device *hid)
  62{
  63        struct lg2ff_device *lg2ff;
  64        struct hid_report *report;
  65        struct hid_input *hidinput = list_entry(hid->inputs.next,
  66                                                struct hid_input, list);
  67        struct list_head *report_list =
  68                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  69        struct input_dev *dev = hidinput->input;
  70        int error;
  71
  72        if (list_empty(report_list)) {
  73                hid_err(hid, "no output report found\n");
  74                return -ENODEV;
  75        }
  76
  77        report = list_entry(report_list->next, struct hid_report, list);
  78
  79        if (report->maxfield < 1) {
  80                hid_err(hid, "output report is empty\n");
  81                return -ENODEV;
  82        }
  83        if (report->field[0]->report_count < 7) {
  84                hid_err(hid, "not enough values in the field\n");
  85                return -ENODEV;
  86        }
  87
  88        lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
  89        if (!lg2ff)
  90                return -ENOMEM;
  91
  92        set_bit(FF_RUMBLE, dev->ffbit);
  93
  94        error = input_ff_create_memless(dev, lg2ff, play_effect);
  95        if (error) {
  96                kfree(lg2ff);
  97                return error;
  98        }
  99
 100        lg2ff->report = report;
 101        report->field[0]->value[0] = 0xf3;
 102        report->field[0]->value[1] = 0x00;
 103        report->field[0]->value[2] = 0x00;
 104        report->field[0]->value[3] = 0x00;
 105        report->field[0]->value[4] = 0x00;
 106        report->field[0]->value[5] = 0x00;
 107        report->field[0]->value[6] = 0x00;
 108
 109        hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 110
 111        hid_info(hid, "Force feedback for Logitech RumblePad/Rumblepad 2 by Anssi Hannula <anssi.hannula@gmail.com>\n");
 112
 113        return 0;
 114}
 115
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