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 33 struct lg4ff_device { 34 struct hid_report *report; 35 }; 36 37 static const signed short ff4_wheel_ac[] = { 38 FF_CONSTANT, 39 FF_AUTOCENTER, 40 -1 41 }; 42 43 static int hid_lg4ff_play(struct input_dev *dev, void *data, 44 struct ff_effect *effect) 45 { 46 struct hid_device *hid = input_get_drvdata(dev); 47 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 48 struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 49 int x; 50 51 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff 52 53 switch (effect->type) { 54 case FF_CONSTANT: 55 x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */ 56 CLAMP(x); 57 report->field[0]->value[0] = 0x11; /* Slot 1 */ 58 report->field[0]->value[1] = 0x10; 59 report->field[0]->value[2] = x; 60 report->field[0]->value[3] = 0x00; 61 report->field[0]->value[4] = 0x00; 62 report->field[0]->value[5] = 0x08; 63 report->field[0]->value[6] = 0x00; 64 dbg_hid("Autocenter, x=0x%02X\n", x); 65 66 usbhid_submit_report(hid, report, USB_DIR_OUT); 67 break; 68 } 69 return 0; 70 } 71 72 static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude) 73 { 74 struct hid_device *hid = input_get_drvdata(dev); 75 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 76 struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 77 __s32 *value = report->field[0]->value; 78 79 *value++ = 0xfe; 80 *value++ = 0x0d; 81 *value++ = 0x07; 82 *value++ = 0x07; 83 *value++ = (magnitude >> 8) & 0xff; 84 *value++ = 0x00; 85 *value = 0x00; 86 87 usbhid_submit_report(hid, report, USB_DIR_OUT); 88 } 89 90 91 int lg4ff_init(struct hid_device *hid) 92 { 93 struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); 94 struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 95 struct input_dev *dev = hidinput->input; 96 struct hid_report *report; 97 struct hid_field *field; 98 const signed short *ff_bits = ff4_wheel_ac; 99 int error; 100 int i; 101 102 /* Find the report to use */ 103 if (list_empty(report_list)) { 104 hid_err(hid, "No output report found\n"); 105 return -1; 106 } 107 108 /* Check that the report looks ok */ 109 report = list_entry(report_list->next, struct hid_report, list); 110 if (!report) { 111 hid_err(hid, "NULL output report\n"); 112 return -1; 113 } 114 115 field = report->field[0]; 116 if (!field) { 117 hid_err(hid, "NULL field\n"); 118 return -1; 119 } 120 121 for (i = 0; ff_bits[i] >= 0; i++) 122 set_bit(ff_bits[i], dev->ffbit); 123 124 error = input_ff_create_memless(dev, NULL, hid_lg4ff_play); 125 126 if (error) 127 return error; 128 129 if (test_bit(FF_AUTOCENTER, dev->ffbit)) 130 dev->ff->set_autocenter = hid_lg4ff_set_autocenter; 131 132 hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n"); 133 return 0; 134 } 135 136