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148 lines
3.2 KiB
148 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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*/ |
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/* |
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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/module.h> |
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#include "hid-ids.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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hid_hw_request(hid, emsff->report, HID_REQ_SET_REPORT); |
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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; |
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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; |
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int error; |
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if (list_empty(&hid->inputs)) { |
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hid_err(hid, "no inputs found\n"); |
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return -ENODEV; |
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} |
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hidinput = list_first_entry(&hid->inputs, struct hid_input, list); |
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dev = hidinput->input; |
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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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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 <[email protected]>\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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module_hid_driver(ems_driver); |
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MODULE_LICENSE("GPL"); |
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