cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hid-zpff.c (3096B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Force feedback support for Zeroplus based devices
      4 *
      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_FF
     20
     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 Zeroplus
     34	 * datasheet but the order below is correct for the XFX Executioner;
     35	 * however it is possible that the XFX Executioner is an exception
     36	 */
     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#else
     98static inline int zpff_init(struct hid_device *hid)
     99{
    100	return 0;
    101}
    102#endif
    103
    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_LICENSE("GPL");