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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Force feedback support for Zeroplus based devices4 *5 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>6 */7 8/*9 */10 11 12#include <linux/hid.h>13#include <linux/input.h>14#include <linux/slab.h>15#include <linux/module.h>16 17#include "hid-ids.h"18 19#ifdef CONFIG_ZEROPLUS_FF20 21struct zpff_device {22 struct hid_report *report;23};24 25static int zpff_play(struct input_dev *dev, void *data,26 struct ff_effect *effect)27{28 struct hid_device *hid = input_get_drvdata(dev);29 struct zpff_device *zpff = data;30 int left, right;31 32 /*33 * The following is specified the other way around in the Zeroplus34 * datasheet but the order below is correct for the XFX Executioner;35 * however it is possible that the XFX Executioner is an exception36 */37 38 left = effect->u.rumble.strong_magnitude;39 right = effect->u.rumble.weak_magnitude;40 dbg_hid("called with 0x%04x 0x%04x\n", left, right);41 42 left = left * 0x7f / 0xffff;43 right = right * 0x7f / 0xffff;44 45 zpff->report->field[2]->value[0] = left;46 zpff->report->field[3]->value[0] = right;47 dbg_hid("running with 0x%02x 0x%02x\n", left, right);48 hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);49 50 return 0;51}52 53static int zpff_init(struct hid_device *hid)54{55 struct zpff_device *zpff;56 struct hid_report *report;57 struct hid_input *hidinput;58 struct input_dev *dev;59 int i, error;60 61 if (list_empty(&hid->inputs)) {62 hid_err(hid, "no inputs found\n");63 return -ENODEV;64 }65 hidinput = list_entry(hid->inputs.next, struct hid_input, list);66 dev = hidinput->input;67 68 for (i = 0; i < 4; i++) {69 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);70 if (!report)71 return -ENODEV;72 }73 74 zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);75 if (!zpff)76 return -ENOMEM;77 78 set_bit(FF_RUMBLE, dev->ffbit);79 80 error = input_ff_create_memless(dev, zpff, zpff_play);81 if (error) {82 kfree(zpff);83 return error;84 }85 86 zpff->report = report;87 zpff->report->field[0]->value[0] = 0x00;88 zpff->report->field[1]->value[0] = 0x02;89 zpff->report->field[2]->value[0] = 0x00;90 zpff->report->field[3]->value[0] = 0x00;91 hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);92 93 hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");94 95 return 0;96}97#else98static inline int zpff_init(struct hid_device *hid)99{100 return 0;101}102#endif103 104static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)105{106 int ret;107 108 ret = hid_parse(hdev);109 if (ret) {110 hid_err(hdev, "parse failed\n");111 goto err;112 }113 114 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);115 if (ret) {116 hid_err(hdev, "hw start failed\n");117 goto err;118 }119 120 zpff_init(hdev);121 122 return 0;123err:124 return ret;125}126 127static const struct hid_device_id zp_devices[] = {128 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },129 { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },130 { }131};132MODULE_DEVICE_TABLE(hid, zp_devices);133 134static struct hid_driver zp_driver = {135 .name = "zeroplus",136 .id_table = zp_devices,137 .probe = zp_probe,138};139module_hid_driver(zp_driver);140 141MODULE_DESCRIPTION("Force feedback support for Zeroplus based devices");142MODULE_LICENSE("GPL");143