LXR linux/drivers/hid/hid-axff.c

   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 = list_first_entry(&hid->inputs, struct hid_input, list);
  67        struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
  68        struct input_dev *dev = hidinput->input;
  69        int field_count = 0;
  70        int i, j;
  71        int error;
  72
  73        if (list_empty(report_list)) {
  74                hid_err(hid, "no output reports found\n");
  75                return -ENODEV;
  76        }
  77
  78        report = list_first_entry(report_list, struct hid_report, list);
  79        for (i = 0; i < report->maxfield; i++) {
  80                for (j = 0; j < report->field[i]->report_count; j++) {
  81                        report->field[i]->value[j] = 0x00;
  82                        field_count++;
  83                }
  84        }
  85
  86        if (field_count < 4 && hid->product != 0xf705) {
  87                hid_err(hid, "not enough fields in the report: %d\n",
  88                        field_count);
  89                return -ENODEV;
  90        }
  91
  92        axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
  93        if (!axff)
  94                return -ENOMEM;
  95
  96        set_bit(FF_RUMBLE, dev->ffbit);
  97
  98        error = input_ff_create_memless(dev, axff, axff_play);
  99        if (error)
 100                goto err_free_mem;
 101
 102        axff->report = report;
 103        hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
 104
 105        hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
 106
 107        return 0;
 108
 109err_free_mem:
 110        kfree(axff);
 111        return error;
 112}
 113#else
 114static inline int axff_init(struct hid_device *hid)
 115{
 116        return 0;
 117}
 118#endif
 119
 120static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
 121{
 122        int error;
 123
 124        dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
 125
 126        error = hid_parse(hdev);
 127        if (error) {
 128                hid_err(hdev, "parse failed\n");
 129                return error;
 130        }
 131
 132        error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 133        if (error) {
 134                hid_err(hdev, "hw start failed\n");
 135                return error;
 136        }
 137
 138        error = axff_init(hdev);
 139        if (error) {
 140                /*
 141                 * Do not fail device initialization completely as device
 142                 * may still be partially operable, just warn.
 143                 */
 144                hid_warn(hdev,
 145                         "Failed to enable force feedback support, error: %d\n",
 146                         error);
 147        }
 148
 149        /*
 150         * We need to start polling device right away, otherwise
 151         * it will go into a coma.
 152         */
 153        error = hid_hw_open(hdev);
 154        if (error) {
 155                dev_err(&hdev->dev, "hw open failed\n");
 156                hid_hw_stop(hdev);
 157                return error;
 158        }
 159
 160        return 0;
 161}
 162
 163static void ax_remove(struct hid_device *hdev)
 164{
 165        hid_hw_close(hdev);
 166        hid_hw_stop(hdev);
 167}
 168
 169static const struct hid_device_id ax_devices[] = {
 170        { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
 171        { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0xf705), },
 172        { }
 173};
 174MODULE_DEVICE_TABLE(hid, ax_devices);
 175
 176static struct hid_driver ax_driver = {
 177        .name           = "acrux",
 178        .id_table       = ax_devices,
 179        .probe          = ax_probe,
 180        .remove         = ax_remove,
 181};
 182module_hid_driver(ax_driver);
 183
 184MODULE_AUTHOR("Sergei Kolzun");
 185MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
 186MODULE_LICENSE("GPL");
 187