hid-lg4ff.c revision 7362cd2286d2364cca6738b583668f64254fe04b
1/* 2 * Force feedback support for Logitech Speed Force Wireless 3 * 4 * http://wiibrew.org/wiki/Logitech_USB_steering_wheel 5 * 6 * Copyright (c) 2010 Simon Wood <simon@mungewell.org> 7 */ 8 9/* 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25 26#include <linux/input.h> 27#include <linux/usb.h> 28#include <linux/hid.h> 29 30#include "usbhid/usbhid.h" 31#include "hid-lg.h" 32#include "hid-ids.h" 33 34static const signed short lg4ff_wheel_effects[] = { 35 FF_CONSTANT, 36 FF_AUTOCENTER, 37 -1 38}; 39 40struct lg4ff_wheel { 41 const __u32 product_id; 42 const signed short *ff_effects; 43 const __u16 min_range; 44 const __u16 max_range; 45}; 46 47static const struct lg4ff_wheel lg4ff_devices[] = { 48 {USB_DEVICE_ID_LOGITECH_WHEEL, lg4ff_wheel_effects, 40, 270}, 49 {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL, lg4ff_wheel_effects, 40, 270}, 50 {USB_DEVICE_ID_LOGITECH_DFP_WHEEL, lg4ff_wheel_effects, 40, 900}, 51 {USB_DEVICE_ID_LOGITECH_G25_WHEEL, lg4ff_wheel_effects, 40, 900}, 52 {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL, lg4ff_wheel_effects, 40, 900}, 53 {USB_DEVICE_ID_LOGITECH_G27_WHEEL, lg4ff_wheel_effects, 40, 900}, 54 {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270}, 55 {USB_DEVICE_ID_LOGITECH_WII_WHEEL, lg4ff_wheel_effects, 40, 270} 56}; 57 58static int hid_lg4ff_play(struct input_dev *dev, void *data, 59 struct ff_effect *effect) 60{ 61 struct hid_device *hid = input_get_drvdata(dev); 62 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 63 struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 64 int x; 65 66#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff 67 68 switch (effect->type) { 69 case FF_CONSTANT: 70 x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */ 71 CLAMP(x); 72 report->field[0]->value[0] = 0x11; /* Slot 1 */ 73 report->field[0]->value[1] = 0x08; 74 report->field[0]->value[2] = x; 75 report->field[0]->value[3] = 0x80; 76 report->field[0]->value[4] = 0x00; 77 report->field[0]->value[5] = 0x00; 78 report->field[0]->value[6] = 0x00; 79 80 usbhid_submit_report(hid, report, USB_DIR_OUT); 81 break; 82 } 83 return 0; 84} 85 86static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude) 87{ 88 struct hid_device *hid = input_get_drvdata(dev); 89 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 90 struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 91 92 report->field[0]->value[0] = 0xfe; 93 report->field[0]->value[1] = 0x0d; 94 report->field[0]->value[2] = magnitude >> 13; 95 report->field[0]->value[3] = magnitude >> 13; 96 report->field[0]->value[4] = magnitude >> 8; 97 report->field[0]->value[5] = 0x00; 98 report->field[0]->value[6] = 0x00; 99 100 usbhid_submit_report(hid, report, USB_DIR_OUT); 101} 102 103 104int lg4ff_init(struct hid_device *hid) 105{ 106 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); 107 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 108 struct input_dev *dev = hidinput->input; 109 struct hid_report *report; 110 struct hid_field *field; 111 int error, i, j; 112 113 /* Find the report to use */ 114 if (list_empty(report_list)) { 115 hid_err(hid, "No output report found\n"); 116 return -1; 117 } 118 119 /* Check that the report looks ok */ 120 report = list_entry(report_list->next, struct hid_report, list); 121 if (!report) { 122 hid_err(hid, "NULL output report\n"); 123 return -1; 124 } 125 126 field = report->field[0]; 127 if (!field) { 128 hid_err(hid, "NULL field\n"); 129 return -1; 130 } 131 132 /* Check what wheel has been connected */ 133 for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) { 134 if (hid->product == lg4ff_devices[i].product_id) { 135 dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id); 136 break; 137 } 138 } 139 140 if (i == ARRAY_SIZE(lg4ff_devices)) { 141 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to" 142 "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n"); 143 return -1; 144 } 145 146 /* Set supported force feedback capabilities */ 147 for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++) 148 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit); 149 150 error = input_ff_create_memless(dev, NULL, hid_lg4ff_play); 151 152 if (error) 153 return error; 154 155 if (test_bit(FF_AUTOCENTER, dev->ffbit)) 156 dev->ff->set_autocenter = hid_lg4ff_set_autocenter; 157 158 hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n"); 159 return 0; 160} 161 162