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 30 struct lg2ff_device { 31 struct hid_report *report; 32 }; 33 34 static 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 61 int 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