// SPDX-License-Identifier: GPL-2.0-or-later /* * Force feedback support for GreenAsia (Product ID 0x12) based devices * * The devices are distributed under various names and the same USB device ID * can be used in many game controllers. * * 0e8f:0012 "GreenAsia Inc. USB Joystick " * - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635. * * Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info> */ /* */ #include <linux/input.h> #include <linux/slab.h> #include <linux/hid.h> #include <linux/module.h> #include "hid-ids.h" #ifdef CONFIG_GREENASIA_FF struct gaff_device { struct hid_report *report; }; static int hid_gaff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct gaff_device *gaff = data; int left, right; left = effect->u.rumble.strong_magnitude; right = effect->u.rumble.weak_magnitude; dbg_hid("called with 0x%04x 0x%04x", left, right); left = left * 0xfe / 0xffff; right = right * 0xfe / 0xffff; gaff->report->field[0]->value[0] = 0x51; gaff->report->field[0]->value[1] = 0x0; gaff->report->field[0]->value[2] = right; gaff->report->field[0]->value[3] = 0; gaff->report->field[0]->value[4] = left; gaff->report->field[0]->value[5] = 0; dbg_hid("running with 0x%02x 0x%02x", left, right); hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT); gaff->report->field[0]->value[0] = 0xfa; gaff->report->field[0]->value[1] = 0xfe; gaff->report->field[0]->value[2] = 0x0; gaff->report->field[0]->value[4] = 0x0; hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT); return 0; } static int gaff_init(struct hid_device *hid) { struct gaff_device *gaff; struct hid_report *report; struct hid_input *hidinput; struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; struct list_head *report_ptr = report_list; struct input_dev *dev; int error; if (list_empty(&hid->inputs)) { hid_err(hid, "no inputs found\n"); return -ENODEV; } hidinput = list_entry(hid->inputs.next, struct hid_input, list); dev = hidinput->input; if (list_empty(report_list)) { hid_err(hid, "no output reports found\n"); return -ENODEV; } report_ptr = report_ptr->next; report = list_entry(report_ptr, struct hid_report, list); if (report->maxfield < 1) { hid_err(hid, "no fields in the report\n"); return -ENODEV; } if (report->field[0]->report_count < 6) { hid_err(hid, "not enough values in the field\n"); return -ENODEV; } gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL); if (!gaff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, gaff, hid_gaff_play); if (error) { kfree(gaff); return error; } gaff->report = report; gaff->report->field[0]->value[0] = 0x51; gaff->report->field[0]->value[1] = 0x00; gaff->report->field[0]->value[2] = 0x00; gaff->report->field[0]->value[3] = 0x00; hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT); gaff->report->field[0]->value[0] = 0xfa; gaff->report->field[0]->value[1] = 0xfe; hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT); hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n"); return 0; } #else static inline int gaff_init(struct hid_device *hdev) { return 0; } #endif static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; dev_dbg(&hdev->dev, "Greenasia HID hardware probe..."); ret = hid_parse(hdev); if (ret) { hid_err(hdev, "parse failed\n"); goto err; } ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); if (ret) { hid_err(hdev, "hw start failed\n"); goto err; } gaff_init(hdev); return 0; err: return ret; } static const struct hid_device_id ga_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012), }, { } }; MODULE_DEVICE_TABLE(hid, ga_devices); static struct hid_driver ga_driver = { .name = "greenasia", .id_table = ga_devices, .probe = ga_probe, }; module_hid_driver(ga_driver); MODULE_LICENSE("GPL");