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-axff.c (4343B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Force feedback support for ACRUX game controllers
      4 *
      5 * From what I have gathered, these devices are mass produced in China
      6 * by several vendors. They often share the same design as the original
      7 * Xbox 360 controller.
      8 *
      9 * 1a34:0802 "ACRUX USB GAMEPAD 8116"
     10 *  - tested with an EXEQ EQ-PCU-02090 game controller.
     11 *
     12 * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
     13 */
     14
     15/*
     16 */
     17
     18#include <linux/input.h>
     19#include <linux/slab.h>
     20#include <linux/hid.h>
     21#include <linux/module.h>
     22
     23#include "hid-ids.h"
     24
     25#ifdef CONFIG_HID_ACRUX_FF
     26
     27struct axff_device {
     28	struct hid_report *report;
     29};
     30
     31static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
     32{
     33	struct hid_device *hid = input_get_drvdata(dev);
     34	struct axff_device *axff = data;
     35	struct hid_report *report = axff->report;
     36	int field_count = 0;
     37	int left, right;
     38	int i, j;
     39
     40	left = effect->u.rumble.strong_magnitude;
     41	right = effect->u.rumble.weak_magnitude;
     42
     43	dbg_hid("called with 0x%04x 0x%04x", left, right);
     44
     45	left = left * 0xff / 0xffff;
     46	right = right * 0xff / 0xffff;
     47
     48	for (i = 0; i < report->maxfield; i++) {
     49		for (j = 0; j < report->field[i]->report_count; j++) {
     50			report->field[i]->value[j] =
     51				field_count % 2 ? right : left;
     52			field_count++;
     53		}
     54	}
     55
     56	dbg_hid("running with 0x%02x 0x%02x", left, right);
     57	hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
     58
     59	return 0;
     60}
     61
     62static int axff_init(struct hid_device *hid)
     63{
     64	struct axff_device *axff;
     65	struct hid_report *report;
     66	struct hid_input *hidinput;
     67	struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
     68	struct input_dev *dev;
     69	int field_count = 0;
     70	int i, j;
     71	int error;
     72
     73	if (list_empty(&hid->inputs)) {
     74		hid_err(hid, "no inputs found\n");
     75		return -ENODEV;
     76	}
     77	hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
     78	dev = hidinput->input;
     79
     80	if (list_empty(report_list)) {
     81		hid_err(hid, "no output reports found\n");
     82		return -ENODEV;
     83	}
     84
     85	report = list_first_entry(report_list, struct hid_report, list);
     86	for (i = 0; i < report->maxfield; i++) {
     87		for (j = 0; j < report->field[i]->report_count; j++) {
     88			report->field[i]->value[j] = 0x00;
     89			field_count++;
     90		}
     91	}
     92
     93	if (field_count < 4 && hid->product != 0xf705) {
     94		hid_err(hid, "not enough fields in the report: %d\n",
     95			field_count);
     96		return -ENODEV;
     97	}
     98
     99	axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
    100	if (!axff)
    101		return -ENOMEM;
    102
    103	set_bit(FF_RUMBLE, dev->ffbit);
    104
    105	error = input_ff_create_memless(dev, axff, axff_play);
    106	if (error)
    107		goto err_free_mem;
    108
    109	axff->report = report;
    110	hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
    111
    112	hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
    113
    114	return 0;
    115
    116err_free_mem:
    117	kfree(axff);
    118	return error;
    119}
    120#else
    121static inline int axff_init(struct hid_device *hid)
    122{
    123	return 0;
    124}
    125#endif
    126
    127static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
    128{
    129	int error;
    130
    131	dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
    132
    133	error = hid_parse(hdev);
    134	if (error) {
    135		hid_err(hdev, "parse failed\n");
    136		return error;
    137	}
    138
    139	error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
    140	if (error) {
    141		hid_err(hdev, "hw start failed\n");
    142		return error;
    143	}
    144
    145	error = axff_init(hdev);
    146	if (error) {
    147		/*
    148		 * Do not fail device initialization completely as device
    149		 * may still be partially operable, just warn.
    150		 */
    151		hid_warn(hdev,
    152			 "Failed to enable force feedback support, error: %d\n",
    153			 error);
    154	}
    155
    156	/*
    157	 * We need to start polling device right away, otherwise
    158	 * it will go into a coma.
    159	 */
    160	error = hid_hw_open(hdev);
    161	if (error) {
    162		dev_err(&hdev->dev, "hw open failed\n");
    163		hid_hw_stop(hdev);
    164		return error;
    165	}
    166
    167	return 0;
    168}
    169
    170static void ax_remove(struct hid_device *hdev)
    171{
    172	hid_hw_close(hdev);
    173	hid_hw_stop(hdev);
    174}
    175
    176static const struct hid_device_id ax_devices[] = {
    177	{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
    178	{ HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
    179	{ }
    180};
    181MODULE_DEVICE_TABLE(hid, ax_devices);
    182
    183static struct hid_driver ax_driver = {
    184	.name		= "acrux",
    185	.id_table	= ax_devices,
    186	.probe		= ax_probe,
    187	.remove		= ax_remove,
    188};
    189module_hid_driver(ax_driver);
    190
    191MODULE_AUTHOR("Sergei Kolzun");
    192MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
    193MODULE_LICENSE("GPL");