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drivers/hid/hid-emsff.c
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/* * Force feedback support for EMS Trio Linker Plus II * * Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de> */ /* * 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 */ #include <linux/hid.h> #include <linux/input.h> |
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#include <linux/module.h> |
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#include "hid-ids.h" |
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struct emsff_device { struct hid_report *report; }; static int emsff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct emsff_device *emsff = data; int weak, strong; weak = effect->u.rumble.weak_magnitude; strong = effect->u.rumble.strong_magnitude; dbg_hid("called with 0x%04x 0x%04x ", strong, weak); weak = weak * 0xff / 0xffff; strong = strong * 0xff / 0xffff; emsff->report->field[0]->value[1] = weak; emsff->report->field[0]->value[2] = strong; dbg_hid("running with 0x%02x 0x%02x ", strong, weak); |
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hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); |
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return 0; } static int emsff_init(struct hid_device *hid) { struct emsff_device *emsff; struct hid_report *report; struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list); struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; struct input_dev *dev = hidinput->input; int error; if (list_empty(report_list)) { |
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hid_err(hid, "no output reports found "); |
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return -ENODEV; } report = list_first_entry(report_list, struct hid_report, list); if (report->maxfield < 1) { |
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hid_err(hid, "no fields in the report "); |
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return -ENODEV; } if (report->field[0]->report_count < 7) { |
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hid_err(hid, "not enough values in the field "); |
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return -ENODEV; } emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL); if (!emsff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, emsff, emsff_play); if (error) { kfree(emsff); return error; } emsff->report = report; emsff->report->field[0]->value[0] = 0x01; emsff->report->field[0]->value[1] = 0x00; emsff->report->field[0]->value[2] = 0x00; emsff->report->field[0]->value[3] = 0x00; emsff->report->field[0]->value[4] = 0x00; emsff->report->field[0]->value[5] = 0x00; emsff->report->field[0]->value[6] = 0x00; |
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hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); |
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hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de> "); |
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return 0; } static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; ret = hid_parse(hdev); if (ret) { |
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hid_err(hdev, "parse failed "); |
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goto err; } ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); if (ret) { |
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hid_err(hdev, "hw start failed "); |
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goto err; } |
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ret = emsff_init(hdev); if (ret) { dev_err(&hdev->dev, "force feedback init failed "); hid_hw_stop(hdev); goto err; } |
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return 0; err: return ret; } 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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{ } }; MODULE_DEVICE_TABLE(hid, ems_devices); static struct hid_driver ems_driver = { .name = "hkems", .id_table = ems_devices, .probe = ems_probe, }; |
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module_hid_driver(ems_driver); |
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MODULE_LICENSE("GPL"); |