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 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