// SPDX-License-Identifier: GPL-2.0-or-later /* * Force feedback support for Zeroplus based devices * * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com> */ /* */ #include <linux/hid.h> #include <linux/input.h> #include <linux/slab.h> #include <linux/module.h> #include "hid-ids.h" #ifdef CONFIG_ZEROPLUS_FF struct zpff_device { struct hid_report *report; }; static int zpff_play(struct input_dev *dev, void *data, struct ff_effect *effect) { struct hid_device *hid = input_get_drvdata(dev); struct zpff_device *zpff = data; int left, right; /* * The following is specified the other way around in the Zeroplus * datasheet but the order below is correct for the XFX Executioner; * however it is possible that the XFX Executioner is an exception */ left = effect->u.rumble.strong_magnitude; right = effect->u.rumble.weak_magnitude; dbg_hid("called with 0x%04x 0x%04x\n", left, right); left = left * 0x7f / 0xffff; right = right * 0x7f / 0xffff; zpff->report->field[2]->value[0] = left; zpff->report->field[3]->value[0] = right; dbg_hid("running with 0x%02x 0x%02x\n", left, right); hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT); return 0; } static int zpff_init(struct hid_device *hid) { struct zpff_device *zpff; struct hid_report *report; struct hid_input *hidinput; struct input_dev *dev; int i, 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; for (i = 0; i < 4; i++) { report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1); if (!report) return -ENODEV; } zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL); if (!zpff) return -ENOMEM; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, zpff, zpff_play); if (error) { kfree(zpff); return error; } zpff->report = report; zpff->report->field[0]->value[0] = 0x00; zpff->report->field[1]->value[0] = 0x02; zpff->report->field[2]->value[0] = 0x00; zpff->report->field[3]->value[0] = 0x00; hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT); hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n"); return 0; } #else static inline int zpff_init(struct hid_device *hid) { return 0; } #endif static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id) { int ret; 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; } zpff_init(hdev); return 0; err: return ret; } static const struct hid_device_id zp_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) }, { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) }, { } }; MODULE_DEVICE_TABLE(hid, zp_devices); static struct hid_driver zp_driver = { .name = "zeroplus", .id_table = zp_devices, .probe = zp_probe, }; module_hid_driver(zp_driver); MODULE_DESCRIPTION("Force feedback support for Zeroplus based devices"); MODULE_LICENSE("GPL");