root/drivers/hid/hid-betopff.c

DEFINITIONS

1. hid_betopff_play
2. betopff_init
3. betop_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Force feedback support for Betop based devices
   4  *
   5  *  The devices are distributed under various names and the same USB device ID
   6  *  can be used in both adapters and actual game controllers.
   7  *
   8  *  0x11c2:0x2208 "BTP2185 BFM mode Joystick"
   9  *   - tested with BTP2185 BFM Mode.
  10  *
  11  *  0x11C0:0x5506 "BTP2185 PC mode Joystick"
  12  *   - tested with BTP2185 PC Mode.
  13  *
  14  *  0x8380:0x1850 "BTP2185 V2 PC mode USB Gamepad"
  15  *   - tested with BTP2185 PC Mode with another version.
  16  *
  17  *  0x20bc:0x5500 "BTP2185 V2 BFM mode Joystick"
  18  *   - tested with BTP2171s.
  19  *  Copyright (c) 2014 Huang Bo <huangbobupt@163.com>
  20  */
  21 
  22 /*
  23  */
  24 
  25 
  26 #include <linux/input.h>
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/hid.h>
  30 
  31 #include "hid-ids.h"
  32 
  33 struct betopff_device {
  34         struct hid_report *report;
  35 };
  36 
  37 static int hid_betopff_play(struct input_dev *dev, void *data,
  38                          struct ff_effect *effect)
  39 {
  40         struct hid_device *hid = input_get_drvdata(dev);
  41         struct betopff_device *betopff = data;
  42         __u16 left, right;
  43 
  44         left = effect->u.rumble.strong_magnitude;
  45         right = effect->u.rumble.weak_magnitude;
  46 
  47         betopff->report->field[2]->value[0] = left / 256;
  48         betopff->report->field[3]->value[0] = right / 256;
  49 
  50         hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
  51 
  52         return 0;
  53 }
  54 
  55 static int betopff_init(struct hid_device *hid)
  56 {
  57         struct betopff_device *betopff;
  58         struct hid_report *report;
  59         struct hid_input *hidinput =
  60                         list_first_entry(&hid->inputs, struct hid_input, list);
  61         struct list_head *report_list =
  62                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  63         struct input_dev *dev = hidinput->input;
  64         int field_count = 0;
  65         int error;
  66         int i, j;
  67 
  68         if (list_empty(report_list)) {
  69                 hid_err(hid, "no output reports found\n");
  70                 return -ENODEV;
  71         }
  72 
  73         report = list_first_entry(report_list, struct hid_report, list);
  74         /*
  75          * Actually there are 4 fields for 4 Bytes as below:
  76          * -----------------------------------------
  77          * Byte0  Byte1  Byte2    Byte3
  78          * 0x00   0x00   left_motor right_motor
  79          * -----------------------------------------
  80          * Do init them with default value.
  81          */
  82         for (i = 0; i < report->maxfield; i++) {
  83                 for (j = 0; j < report->field[i]->report_count; j++) {
  84                         report->field[i]->value[j] = 0x00;
  85                         field_count++;
  86                 }
  87         }
  88 
  89         if (field_count < 4) {
  90                 hid_err(hid, "not enough fields in the report: %d\n",
  91                                 field_count);
  92                 return -ENODEV;
  93         }
  94 
  95         betopff = kzalloc(sizeof(*betopff), GFP_KERNEL);
  96         if (!betopff)
  97                 return -ENOMEM;
  98 
  99         set_bit(FF_RUMBLE, dev->ffbit);
 100 
 101         error = input_ff_create_memless(dev, betopff, hid_betopff_play);
 102         if (error) {
 103                 kfree(betopff);
 104                 return error;
 105         }
 106 
 107         betopff->report = report;
 108         hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
 109 
 110         hid_info(hid, "Force feedback for betop devices by huangbo <huangbobupt@163.com>\n");
 111 
 112         return 0;
 113 }
 114 
 115 static int betop_probe(struct hid_device *hdev, const struct hid_device_id *id)
 116 {
 117         int ret;
 118 
 119         if (id->driver_data)
 120                 hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 121 
 122         ret = hid_parse(hdev);
 123         if (ret) {
 124                 hid_err(hdev, "parse failed\n");
 125                 goto err;
 126         }
 127 
 128         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 129         if (ret) {
 130                 hid_err(hdev, "hw start failed\n");
 131                 goto err;
 132         }
 133 
 134         betopff_init(hdev);
 135 
 136         return 0;
 137 err:
 138         return ret;
 139 }
 140 
 141 static const struct hid_device_id betop_devices[] = {
 142         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185BFM, 0x2208) },
 143         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185PC, 0x5506) },
 144         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2PC, 0x1850) },
 145         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2BFM, 0x5500) },
 146         { }
 147 };
 148 MODULE_DEVICE_TABLE(hid, betop_devices);
 149 
 150 static struct hid_driver betop_driver = {
 151         .name = "betop",
 152         .id_table = betop_devices,
 153         .probe = betop_probe,
 154 };
 155 module_hid_driver(betop_driver);
 156 
 157 MODULE_LICENSE("GPL");