1/* 2 * Force feedback support for Logitech 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 dev_err(&hid->dev, "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 dev_err(&hid->dev, "output report is empty\n"); 83 return -ENODEV; 84 } 85 if (report->field[0]->report_count < 7) { 86 dev_err(&hid->dev, "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 dev_info(&hid->dev, "Force feedback for Logitech Rumblepad 2 by " 114 "Anssi Hannula <anssi.hannula@gmail.com>\n"); 115 116 return 0; 117} 118