167 lines
4 KiB
C
167 lines
4 KiB
C
/*
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* Force feedback support for EMS Trio Linker Plus II
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*
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* Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/hid.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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#include "usbhid/usbhid.h"
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struct emsff_device {
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struct hid_report *report;
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};
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static int emsff_play(struct input_dev *dev, void *data,
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struct ff_effect *effect)
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{
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struct hid_device *hid = input_get_drvdata(dev);
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struct emsff_device *emsff = data;
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int weak, strong;
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weak = effect->u.rumble.weak_magnitude;
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strong = effect->u.rumble.strong_magnitude;
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dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
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weak = weak * 0xff / 0xffff;
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strong = strong * 0xff / 0xffff;
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emsff->report->field[0]->value[1] = weak;
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emsff->report->field[0]->value[2] = strong;
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dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
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usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
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return 0;
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}
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static int emsff_init(struct hid_device *hid)
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{
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struct emsff_device *emsff;
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struct hid_report *report;
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struct hid_input *hidinput = list_first_entry(&hid->inputs,
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struct hid_input, list);
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struct list_head *report_list =
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&hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct input_dev *dev = hidinput->input;
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int error;
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if (list_empty(report_list)) {
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hid_err(hid, "no output reports found\n");
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return -ENODEV;
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}
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report = list_first_entry(report_list, struct hid_report, list);
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if (report->maxfield < 1) {
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hid_err(hid, "no fields in the report\n");
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return -ENODEV;
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}
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if (report->field[0]->report_count < 7) {
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hid_err(hid, "not enough values in the field\n");
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return -ENODEV;
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}
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emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
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if (!emsff)
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return -ENOMEM;
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set_bit(FF_RUMBLE, dev->ffbit);
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error = input_ff_create_memless(dev, emsff, emsff_play);
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if (error) {
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kfree(emsff);
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return error;
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}
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emsff->report = report;
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emsff->report->field[0]->value[0] = 0x01;
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emsff->report->field[0]->value[1] = 0x00;
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emsff->report->field[0]->value[2] = 0x00;
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emsff->report->field[0]->value[3] = 0x00;
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emsff->report->field[0]->value[4] = 0x00;
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emsff->report->field[0]->value[5] = 0x00;
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emsff->report->field[0]->value[6] = 0x00;
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usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
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hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
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return 0;
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}
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static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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goto err;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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goto err;
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}
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ret = emsff_init(hdev);
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if (ret) {
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dev_err(&hdev->dev, "force feedback init failed\n");
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hid_hw_stop(hdev);
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goto err;
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}
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return 0;
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err:
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return ret;
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}
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static const struct hid_device_id ems_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, ems_devices);
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static struct hid_driver ems_driver = {
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.name = "hkems",
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.id_table = ems_devices,
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.probe = ems_probe,
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};
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static int ems_init(void)
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{
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return hid_register_driver(&ems_driver);
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}
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static void ems_exit(void)
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{
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hid_unregister_driver(&ems_driver);
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}
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module_init(ems_init);
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module_exit(ems_exit);
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MODULE_LICENSE("GPL");
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