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125 lines
2.7 KiB
125 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Vibration support for Mega World controllers |
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* |
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* Copyright 2022 Frank Zago |
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* |
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* Derived from hid-zpff.c: |
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* Copyright (c) 2005, 2006 Anssi Hannula <[email protected]> |
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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 <linux/slab.h> |
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#include "hid-ids.h" |
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struct mwctrl_device { |
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struct hid_report *report; |
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s32 *weak; |
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s32 *strong; |
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}; |
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static int mwctrl_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 mwctrl_device *mwctrl = data; |
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*mwctrl->strong = effect->u.rumble.strong_magnitude >> 8; |
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*mwctrl->weak = effect->u.rumble.weak_magnitude >> 8; |
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hid_hw_request(hid, mwctrl->report, HID_REQ_SET_REPORT); |
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return 0; |
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} |
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static int mwctrl_init(struct hid_device *hid) |
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{ |
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struct mwctrl_device *mwctrl; |
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struct hid_report *report; |
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struct hid_input *hidinput; |
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struct input_dev *dev; |
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int error; |
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int i; |
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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_entry(hid->inputs.next, struct hid_input, list); |
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dev = hidinput->input; |
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for (i = 0; i < 4; i++) { |
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report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1); |
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if (!report) |
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return -ENODEV; |
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} |
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mwctrl = kzalloc(sizeof(struct mwctrl_device), GFP_KERNEL); |
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if (!mwctrl) |
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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, mwctrl, mwctrl_play); |
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if (error) { |
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kfree(mwctrl); |
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return error; |
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} |
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mwctrl->report = report; |
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/* Field 0 is always 2, and field 1 is always 0. The original |
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* windows driver has a 5 bytes command, where the 5th byte is |
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* a repeat of the 3rd byte, however the device has only 4 |
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* fields. It could be a bug in the driver, or there is a |
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* different device that needs it. |
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*/ |
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report->field[0]->value[0] = 0x02; |
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mwctrl->strong = &report->field[2]->value[0]; |
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mwctrl->weak = &report->field[3]->value[0]; |
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return 0; |
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} |
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static int mwctrl_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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return ret; |
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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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return ret; |
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} |
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ret = mwctrl_init(hdev); |
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if (ret) |
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hid_hw_stop(hdev); |
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return ret; |
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} |
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static const struct hid_device_id mwctrl_devices[] = { |
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{ HID_USB_DEVICE(USB_VENDOR_MEGAWORLD, |
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USB_DEVICE_ID_MEGAWORLD_GAMEPAD) }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(hid, mwctrl_devices); |
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static struct hid_driver mwctrl_driver = { |
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.name = "megaworld", |
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.id_table = mwctrl_devices, |
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.probe = mwctrl_probe, |
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}; |
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module_hid_driver(mwctrl_driver); |
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MODULE_LICENSE("GPL");
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