LXR linux/drivers/hid/hid-lg2ff.c

   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 input_dev *dev = hidinput->input;
  68        int error;
  69
  70        /* Check that the report looks ok */
  71        report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
  72        if (!report)
  73                return -ENODEV;
  74
  75        lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
  76        if (!lg2ff)
  77                return -ENOMEM;
  78
  79        set_bit(FF_RUMBLE, dev->ffbit);
  80
  81        error = input_ff_create_memless(dev, lg2ff, play_effect);
  82        if (error) {
  83                kfree(lg2ff);
  84                return error;
  85        }
  86
  87        lg2ff->report = report;
  88        report->field[0]->value[0] = 0xf3;
  89        report->field[0]->value[1] = 0x00;
  90        report->field[0]->value[2] = 0x00;
  91        report->field[0]->value[3] = 0x00;
  92        report->field[0]->value[4] = 0x00;
  93        report->field[0]->value[5] = 0x00;
  94        report->field[0]->value[6] = 0x00;
  95
  96        hid_hw_request(hid, report, HID_REQ_SET_REPORT);
  97
  98        hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
  99
 100        return 0;
 101}
 102