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HID: add driver for the Logitech Flight System G940
Implements a new USB-HID for Force Feedback based on the normal Logitech Force Feedback code and FF-Memless. Currently only supports the FF_CONSTANT effect although the joystick appears to support additional non-standard ones. Signed-off-by: Gary Stein <LordCnidarian@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Gary Stein
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Jiri Kosina
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Jan 12, 2010
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Force feedback support for Logitech Flight System G940 | ||
| * | ||
| * Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com> | ||
| */ | ||
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| /* | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| */ | ||
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| #include <linux/input.h> | ||
| #include <linux/usb.h> | ||
| #include <linux/hid.h> | ||
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| #include "usbhid/usbhid.h" | ||
| #include "hid-lg.h" | ||
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| /* | ||
| * G940 Theory of Operation (from experimentation) | ||
| * | ||
| * There are 63 fields (only 3 of them currently used) | ||
| * 0 - seems to be command field | ||
| * 1 - 30 deal with the x axis | ||
| * 31 -60 deal with the y axis | ||
| * | ||
| * Field 1 is x axis constant force | ||
| * Field 31 is y axis constant force | ||
| * | ||
| * other interesting fields 1,2,3,4 on x axis | ||
| * (same for 31,32,33,34 on y axis) | ||
| * | ||
| * 0 0 127 127 makes the joystick autocenter hard | ||
| * | ||
| * 127 0 127 127 makes the joystick loose on the right, | ||
| * but stops all movemnt left | ||
| * | ||
| * -127 0 -127 -127 makes the joystick loose on the left, | ||
| * but stops all movement right | ||
| * | ||
| * 0 0 -127 -127 makes the joystick rattle very hard | ||
| * | ||
| * I'm sure these are effects that I don't know enough about them | ||
| */ | ||
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| struct lg3ff_device { | ||
| struct hid_report *report; | ||
| }; | ||
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| static int hid_lg3ff_play(struct input_dev *dev, void *data, | ||
| struct ff_effect *effect) | ||
| { | ||
| struct hid_device *hid = input_get_drvdata(dev); | ||
| struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | ||
| struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | ||
| int x, y; | ||
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| /* | ||
| * Maxusage should always be 63 (maximum fields) | ||
| * likely a better way to ensure this data is clean | ||
| */ | ||
| memset(report->field[0]->value, 0, sizeof(__s32)*report->field[0]->maxusage); | ||
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| switch (effect->type) { | ||
| case FF_CONSTANT: | ||
| /* | ||
| * Already clamped in ff_memless | ||
| * 0 is center (different then other logitech) | ||
| */ | ||
| x = effect->u.ramp.start_level; | ||
| y = effect->u.ramp.end_level; | ||
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| /* send command byte */ | ||
| report->field[0]->value[0] = 0x51; | ||
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| /* | ||
| * Sign backwards from other Force3d pro | ||
| * which get recast here in two's complement 8 bits | ||
| */ | ||
| report->field[0]->value[1] = (unsigned char)(-x); | ||
| report->field[0]->value[31] = (unsigned char)(-y); | ||
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| usbhid_submit_report(hid, report, USB_DIR_OUT); | ||
| break; | ||
| } | ||
| return 0; | ||
| } | ||
| static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude) | ||
| { | ||
| struct hid_device *hid = input_get_drvdata(dev); | ||
| struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | ||
| struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | ||
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| /* | ||
| * Auto Centering probed from device | ||
| * NOTE: deadman's switch on G940 must be covered | ||
| * for effects to work | ||
| */ | ||
| report->field[0]->value[0] = 0x51; | ||
| report->field[0]->value[1] = 0x00; | ||
| report->field[0]->value[2] = 0x00; | ||
| report->field[0]->value[3] = 0x7F; | ||
| report->field[0]->value[4] = 0x7F; | ||
| report->field[0]->value[31] = 0x00; | ||
| report->field[0]->value[32] = 0x00; | ||
| report->field[0]->value[33] = 0x7F; | ||
| report->field[0]->value[34] = 0x7F; | ||
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| usbhid_submit_report(hid, report, USB_DIR_OUT); | ||
| } | ||
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| static const signed short ff3_joystick_ac[] = { | ||
| FF_CONSTANT, | ||
| FF_AUTOCENTER, | ||
| -1 | ||
| }; | ||
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| int lg3ff_init(struct hid_device *hid) | ||
| { | ||
| struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); | ||
| struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | ||
| struct input_dev *dev = hidinput->input; | ||
| struct hid_report *report; | ||
| struct hid_field *field; | ||
| const signed short *ff_bits = ff3_joystick_ac; | ||
| int error; | ||
| int i; | ||
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| /* Find the report to use */ | ||
| if (list_empty(report_list)) { | ||
| err_hid("No output report found"); | ||
| return -1; | ||
| } | ||
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| /* Check that the report looks ok */ | ||
| report = list_entry(report_list->next, struct hid_report, list); | ||
| if (!report) { | ||
| err_hid("NULL output report"); | ||
| return -1; | ||
| } | ||
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| field = report->field[0]; | ||
| if (!field) { | ||
| err_hid("NULL field"); | ||
| return -1; | ||
| } | ||
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| /* Assume single fixed device G940 */ | ||
| for (i = 0; ff_bits[i] >= 0; i++) | ||
| set_bit(ff_bits[i], dev->ffbit); | ||
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| error = input_ff_create_memless(dev, NULL, hid_lg3ff_play); | ||
| if (error) | ||
| return error; | ||
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| if (test_bit(FF_AUTOCENTER, dev->ffbit)) | ||
| dev->ff->set_autocenter = hid_lg3ff_set_autocenter; | ||
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| dev_info(&hid->dev, "Force feedback for Logitech Flight System G940 by " | ||
| "Gary Stein <LordCnidarian@gmail.com>\n"); | ||
| return 0; | ||
| } | ||
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