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/usb.h> 26 #include <linux/hid.h> 27 28 #include "usbhid/usbhid.h" 29 #include "hid-lg.h" 30 31 struct lg2ff_device { 32 struct hid_report *report; 33 }; 34 35 static int play_effect(struct input_dev *dev, void *data, 36 struct ff_effect *effect) 37 { 38 struct hid_device *hid = input_get_drvdata(dev); 39 struct lg2ff_device *lg2ff = data; 40 int weak, strong; 41 42 strong = effect->u.rumble.strong_magnitude; 43 weak = effect->u.rumble.weak_magnitude; 44 45 if (weak || strong) { 46 weak = weak * 0xff / 0xffff; 47 strong = strong * 0xff / 0xffff; 48 49 lg2ff->report->field[0]->value[0] = 0x51; 50 lg2ff->report->field[0]->value[2] = weak; 51 lg2ff->report->field[0]->value[4] = strong; 52 } else { 53 lg2ff->report->field[0]->value[0] = 0xf3; 54 lg2ff->report->field[0]->value[2] = 0x00; 55 lg2ff->report->field[0]->value[4] = 0x00; 56 } 57 58 usbhid_submit_report(hid, lg2ff->report, USB_DIR_OUT); 59 return 0; 60 } 61 62 int lg2ff_init(struct hid_device *hid) 63 { 64 struct lg2ff_device *lg2ff; 65 struct hid_report *report; 66 struct hid_input *hidinput = list_entry(hid->inputs.next, 67 struct hid_input, list); 68 struct list_head *report_list = 69 &hid->report_enum[HID_OUTPUT_REPORT].report_list; 70 struct input_dev *dev = hidinput->input; 71 int error; 72 73 if (list_empty(report_list)) { 74 dev_err(&hid->dev, "no output report found\n"); 75 return -ENODEV; 76 } 77 78 report = list_entry(report_list->next, struct hid_report, list); 79 80 if (report->maxfield < 1) { 81 dev_err(&hid->dev, "output report is empty\n"); 82 return -ENODEV; 83 } 84 if (report->field[0]->report_count < 7) { 85 dev_err(&hid->dev, "not enough values in the field\n"); 86 return -ENODEV; 87 } 88 89 lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL); 90 if (!lg2ff) 91 return -ENOMEM; 92 93 set_bit(FF_RUMBLE, dev->ffbit); 94 95 error = input_ff_create_memless(dev, lg2ff, play_effect); 96 if (error) { 97 kfree(lg2ff); 98 return error; 99 } 100 101 lg2ff->report = report; 102 report->field[0]->value[0] = 0xf3; 103 report->field[0]->value[1] = 0x00; 104 report->field[0]->value[2] = 0x00; 105 report->field[0]->value[3] = 0x00; 106 report->field[0]->value[4] = 0x00; 107 report->field[0]->value[5] = 0x00; 108 report->field[0]->value[6] = 0x00; 109 110 usbhid_submit_report(hid, report, USB_DIR_OUT); 111 112 dev_info(&hid->dev, "Force feedback for Logitech Rumblepad 2 by " 113 "Anssi Hannula <anssi.hannula@gmail.com>\n"); 114 115 return 0; 116 } 117