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-gaff.c (4090B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Force feedback support for GreenAsia (Product ID 0x12) based devices
      4 *
      5 *  The devices are distributed under various names and the same USB device ID
      6 *  can be used in many game controllers.
      7 *
      8 *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
      9 *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
     10 *
     11 *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
     12 */
     13
     14/*
     15 */
     16
     17#include <linux/input.h>
     18#include <linux/slab.h>
     19#include <linux/hid.h>
     20#include <linux/module.h>
     21#include "hid-ids.h"
     22
     23#ifdef CONFIG_GREENASIA_FF
     24
     25struct gaff_device {
     26	struct hid_report *report;
     27};
     28
     29static int hid_gaff_play(struct input_dev *dev, void *data,
     30			 struct ff_effect *effect)
     31{
     32	struct hid_device *hid = input_get_drvdata(dev);
     33	struct gaff_device *gaff = data;
     34	int left, right;
     35
     36	left = effect->u.rumble.strong_magnitude;
     37	right = effect->u.rumble.weak_magnitude;
     38
     39	dbg_hid("called with 0x%04x 0x%04x", left, right);
     40
     41	left = left * 0xfe / 0xffff;
     42	right = right * 0xfe / 0xffff;
     43
     44	gaff->report->field[0]->value[0] = 0x51;
     45	gaff->report->field[0]->value[1] = 0x0;
     46	gaff->report->field[0]->value[2] = right;
     47	gaff->report->field[0]->value[3] = 0;
     48	gaff->report->field[0]->value[4] = left;
     49	gaff->report->field[0]->value[5] = 0;
     50	dbg_hid("running with 0x%02x 0x%02x", left, right);
     51	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
     52
     53	gaff->report->field[0]->value[0] = 0xfa;
     54	gaff->report->field[0]->value[1] = 0xfe;
     55	gaff->report->field[0]->value[2] = 0x0;
     56	gaff->report->field[0]->value[4] = 0x0;
     57
     58	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
     59
     60	return 0;
     61}
     62
     63static int gaff_init(struct hid_device *hid)
     64{
     65	struct gaff_device *gaff;
     66	struct hid_report *report;
     67	struct hid_input *hidinput;
     68	struct list_head *report_list =
     69			&hid->report_enum[HID_OUTPUT_REPORT].report_list;
     70	struct list_head *report_ptr = report_list;
     71	struct input_dev *dev;
     72	int error;
     73
     74	if (list_empty(&hid->inputs)) {
     75		hid_err(hid, "no inputs found\n");
     76		return -ENODEV;
     77	}
     78	hidinput = list_entry(hid->inputs.next, struct hid_input, list);
     79	dev = hidinput->input;
     80
     81	if (list_empty(report_list)) {
     82		hid_err(hid, "no output reports found\n");
     83		return -ENODEV;
     84	}
     85
     86	report_ptr = report_ptr->next;
     87
     88	report = list_entry(report_ptr, struct hid_report, list);
     89	if (report->maxfield < 1) {
     90		hid_err(hid, "no fields in the report\n");
     91		return -ENODEV;
     92	}
     93
     94	if (report->field[0]->report_count < 6) {
     95		hid_err(hid, "not enough values in the field\n");
     96		return -ENODEV;
     97	}
     98
     99	gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
    100	if (!gaff)
    101		return -ENOMEM;
    102
    103	set_bit(FF_RUMBLE, dev->ffbit);
    104
    105	error = input_ff_create_memless(dev, gaff, hid_gaff_play);
    106	if (error) {
    107		kfree(gaff);
    108		return error;
    109	}
    110
    111	gaff->report = report;
    112	gaff->report->field[0]->value[0] = 0x51;
    113	gaff->report->field[0]->value[1] = 0x00;
    114	gaff->report->field[0]->value[2] = 0x00;
    115	gaff->report->field[0]->value[3] = 0x00;
    116	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
    117
    118	gaff->report->field[0]->value[0] = 0xfa;
    119	gaff->report->field[0]->value[1] = 0xfe;
    120
    121	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
    122
    123	hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
    124
    125	return 0;
    126}
    127#else
    128static inline int gaff_init(struct hid_device *hdev)
    129{
    130	return 0;
    131}
    132#endif
    133
    134static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
    135{
    136	int ret;
    137
    138	dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
    139
    140	ret = hid_parse(hdev);
    141	if (ret) {
    142		hid_err(hdev, "parse failed\n");
    143		goto err;
    144	}
    145
    146	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
    147	if (ret) {
    148		hid_err(hdev, "hw start failed\n");
    149		goto err;
    150	}
    151
    152	gaff_init(hdev);
    153
    154	return 0;
    155err:
    156	return ret;
    157}
    158
    159static const struct hid_device_id ga_devices[] = {
    160	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
    161	{ }
    162};
    163MODULE_DEVICE_TABLE(hid, ga_devices);
    164
    165static struct hid_driver ga_driver = {
    166	.name = "greenasia",
    167	.id_table = ga_devices,
    168	.probe = ga_probe,
    169};
    170module_hid_driver(ga_driver);
    171
    172MODULE_LICENSE("GPL");