174f292caSGary Stein /* 274f292caSGary Stein * Force feedback support for Logitech Flight System G940 374f292caSGary Stein * 474f292caSGary Stein * Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com> 574f292caSGary Stein */ 674f292caSGary Stein 774f292caSGary Stein /* 874f292caSGary Stein * This program is free software; you can redistribute it and/or modify 974f292caSGary Stein * it under the terms of the GNU General Public License as published by 1074f292caSGary Stein * the Free Software Foundation; either version 2 of the License, or 1174f292caSGary Stein * (at your option) any later version. 1274f292caSGary Stein * 1374f292caSGary Stein * This program is distributed in the hope that it will be useful, 1474f292caSGary Stein * but WITHOUT ANY WARRANTY; without even the implied warranty of 1574f292caSGary Stein * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1674f292caSGary Stein * GNU General Public License for more details. 1774f292caSGary Stein * 1874f292caSGary Stein * You should have received a copy of the GNU General Public License 1974f292caSGary Stein * along with this program; if not, write to the Free Software 2074f292caSGary Stein * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 2174f292caSGary Stein */ 2274f292caSGary Stein 2374f292caSGary Stein 2474f292caSGary Stein #include <linux/input.h> 2574f292caSGary Stein #include <linux/hid.h> 2674f292caSGary Stein 2774f292caSGary Stein #include "hid-lg.h" 2874f292caSGary Stein 2974f292caSGary Stein /* 3074f292caSGary Stein * G940 Theory of Operation (from experimentation) 3174f292caSGary Stein * 3274f292caSGary Stein * There are 63 fields (only 3 of them currently used) 3374f292caSGary Stein * 0 - seems to be command field 3474f292caSGary Stein * 1 - 30 deal with the x axis 3574f292caSGary Stein * 31 -60 deal with the y axis 3674f292caSGary Stein * 3774f292caSGary Stein * Field 1 is x axis constant force 3874f292caSGary Stein * Field 31 is y axis constant force 3974f292caSGary Stein * 4074f292caSGary Stein * other interesting fields 1,2,3,4 on x axis 4174f292caSGary Stein * (same for 31,32,33,34 on y axis) 4274f292caSGary Stein * 4374f292caSGary Stein * 0 0 127 127 makes the joystick autocenter hard 4474f292caSGary Stein * 4574f292caSGary Stein * 127 0 127 127 makes the joystick loose on the right, 4674f292caSGary Stein * but stops all movemnt left 4774f292caSGary Stein * 4874f292caSGary Stein * -127 0 -127 -127 makes the joystick loose on the left, 4974f292caSGary Stein * but stops all movement right 5074f292caSGary Stein * 5174f292caSGary Stein * 0 0 -127 -127 makes the joystick rattle very hard 5274f292caSGary Stein * 5374f292caSGary Stein * I'm sure these are effects that I don't know enough about them 5474f292caSGary Stein */ 5574f292caSGary Stein 5674f292caSGary Stein struct lg3ff_device { 5774f292caSGary Stein struct hid_report *report; 5874f292caSGary Stein }; 5974f292caSGary Stein 6074f292caSGary Stein static int hid_lg3ff_play(struct input_dev *dev, void *data, 6174f292caSGary Stein struct ff_effect *effect) 6274f292caSGary Stein { 6374f292caSGary Stein struct hid_device *hid = input_get_drvdata(dev); 6474f292caSGary Stein struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 6574f292caSGary Stein struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 6674f292caSGary Stein int x, y; 6774f292caSGary Stein 6874f292caSGary Stein /* 690fb6bd06SKees Cook * Available values in the field should always be 63, but we only use up to 700fb6bd06SKees Cook * 35. Instead, clear the entire area, however big it is. 7174f292caSGary Stein */ 720fb6bd06SKees Cook memset(report->field[0]->value, 0, 730fb6bd06SKees Cook sizeof(__s32) * report->field[0]->report_count); 7474f292caSGary Stein 7574f292caSGary Stein switch (effect->type) { 7674f292caSGary Stein case FF_CONSTANT: 7774f292caSGary Stein /* 7874f292caSGary Stein * Already clamped in ff_memless 7974f292caSGary Stein * 0 is center (different then other logitech) 8074f292caSGary Stein */ 8174f292caSGary Stein x = effect->u.ramp.start_level; 8274f292caSGary Stein y = effect->u.ramp.end_level; 8374f292caSGary Stein 8474f292caSGary Stein /* send command byte */ 8574f292caSGary Stein report->field[0]->value[0] = 0x51; 8674f292caSGary Stein 8774f292caSGary Stein /* 8874f292caSGary Stein * Sign backwards from other Force3d pro 8974f292caSGary Stein * which get recast here in two's complement 8 bits 9074f292caSGary Stein */ 9174f292caSGary Stein report->field[0]->value[1] = (unsigned char)(-x); 9274f292caSGary Stein report->field[0]->value[31] = (unsigned char)(-y); 9374f292caSGary Stein 94d8814272SBenjamin Tissoires hid_hw_request(hid, report, HID_REQ_SET_REPORT); 9574f292caSGary Stein break; 9674f292caSGary Stein } 9774f292caSGary Stein return 0; 9874f292caSGary Stein } 9974f292caSGary Stein static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude) 10074f292caSGary Stein { 10174f292caSGary Stein struct hid_device *hid = input_get_drvdata(dev); 10274f292caSGary Stein struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; 10374f292caSGary Stein struct hid_report *report = list_entry(report_list->next, struct hid_report, list); 10474f292caSGary Stein 10574f292caSGary Stein /* 10674f292caSGary Stein * Auto Centering probed from device 10774f292caSGary Stein * NOTE: deadman's switch on G940 must be covered 10874f292caSGary Stein * for effects to work 10974f292caSGary Stein */ 11074f292caSGary Stein report->field[0]->value[0] = 0x51; 11174f292caSGary Stein report->field[0]->value[1] = 0x00; 11274f292caSGary Stein report->field[0]->value[2] = 0x00; 11374f292caSGary Stein report->field[0]->value[3] = 0x7F; 11474f292caSGary Stein report->field[0]->value[4] = 0x7F; 11574f292caSGary Stein report->field[0]->value[31] = 0x00; 11674f292caSGary Stein report->field[0]->value[32] = 0x00; 11774f292caSGary Stein report->field[0]->value[33] = 0x7F; 11874f292caSGary Stein report->field[0]->value[34] = 0x7F; 11974f292caSGary Stein 120d8814272SBenjamin Tissoires hid_hw_request(hid, report, HID_REQ_SET_REPORT); 12174f292caSGary Stein } 12274f292caSGary Stein 12374f292caSGary Stein 12474f292caSGary Stein static const signed short ff3_joystick_ac[] = { 12574f292caSGary Stein FF_CONSTANT, 12674f292caSGary Stein FF_AUTOCENTER, 12774f292caSGary Stein -1 12874f292caSGary Stein }; 12974f292caSGary Stein 13074f292caSGary Stein int lg3ff_init(struct hid_device *hid) 13174f292caSGary Stein { 13274f292caSGary Stein struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); 13374f292caSGary Stein struct input_dev *dev = hidinput->input; 13474f292caSGary Stein const signed short *ff_bits = ff3_joystick_ac; 13574f292caSGary Stein int error; 13674f292caSGary Stein int i; 13774f292caSGary Stein 13874f292caSGary Stein /* Check that the report looks ok */ 1390fb6bd06SKees Cook if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35)) 1400fb6bd06SKees Cook return -ENODEV; 14174f292caSGary Stein 14274f292caSGary Stein /* Assume single fixed device G940 */ 14374f292caSGary Stein for (i = 0; ff_bits[i] >= 0; i++) 14474f292caSGary Stein set_bit(ff_bits[i], dev->ffbit); 14574f292caSGary Stein 14674f292caSGary Stein error = input_ff_create_memless(dev, NULL, hid_lg3ff_play); 14774f292caSGary Stein if (error) 14874f292caSGary Stein return error; 14974f292caSGary Stein 15074f292caSGary Stein if (test_bit(FF_AUTOCENTER, dev->ffbit)) 15174f292caSGary Stein dev->ff->set_autocenter = hid_lg3ff_set_autocenter; 15274f292caSGary Stein 1534291ee30SJoe Perches hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n"); 15474f292caSGary Stein return 0; 15574f292caSGary Stein } 15674f292caSGary Stein 157