kernel/drivers/hid/hid-betopff.c

   1 /*
   2  *  Force feedback support for Betop based devices
   3  *
   4  *  The devices are distributed under various names and the same USB device ID
   5  *  can be used in both adapters and actual game controllers.
   6  *
   7  *  0x11c2:0x2208 "BTP2185 BFM mode Joystick"
   8  *   - tested with BTP2185 BFM Mode.
   9  *
  10  *  0x11C0:0x5506 "BTP2185 PC mode Joystick"
  11  *   - tested with BTP2185 PC Mode.
  12  *
  13  *  0x8380:0x1850 "BTP2185 V2 PC mode USB Gamepad"
  14  *   - tested with BTP2185 PC Mode with another version.
  15  *
  16  *  0x20bc:0x5500 "BTP2185 V2 BFM mode Joystick"
  17  *   - tested with BTP2171s.
  18  *  Copyright (c) 2014 Huang Bo <huangbobupt@163.com>
  19  */
  20
  21 /*
  22  * This program is free software; you can redistribute it and/or modify it
  23  * under the terms of the GNU General Public License as published by the Free
  24  * Software Foundation; either version 2 of the License, or (at your option)
  25  * any later version.
  26  */
  27
  28
  29 #include <linux/input.h>
  30 #include <linux/slab.h>
  31 #include <linux/module.h>
  32 #include <linux/hid.h>
  33
  34 #include "hid-ids.h"
  35
  36 struct betopff_device {
  37         struct hid_report *report;
  38 };
  39
  40 static int hid_betopff_play(struct input_dev *dev, void *data,
  41                          struct ff_effect *effect)
  42 {
  43         struct hid_device *hid = input_get_drvdata(dev);
  44         struct betopff_device *betopff = data;
  45         __u16 left, right;
  46
  47         left = effect->u.rumble.strong_magnitude;
  48         right = effect->u.rumble.weak_magnitude;
  49
  50         betopff->report->field[2]->value[0] = left / 256;
  51         betopff->report->field[3]->value[0] = right / 256;
  52
  53         hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
  54
  55         return 0;
  56 }
  57
  58 static int betopff_init(struct hid_device *hid)
  59 {
  60         struct betopff_device *betopff;
  61         struct hid_report *report;
  62         struct hid_input *hidinput =
  63                         list_first_entry(&hid->inputs, struct hid_input, list);
  64         struct list_head *report_list =
  65                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  66         struct input_dev *dev = hidinput->input;
  67         int field_count = 0;
  68         int error;
  69         int i, j;
  70
  71         if (list_empty(report_list)) {
  72                 hid_err(hid, "no output reports found\n");
  73                 return -ENODEV;
  74         }
  75
  76         report = list_first_entry(report_list, struct hid_report, list);
  77         /*
  78          * Actually there are 4 fields for 4 Bytes as below:
  79          * -----------------------------------------
  80          * Byte0  Byte1  Byte2    Byte3
  81          * 0x00   0x00   left_motor right_motor
  82          * -----------------------------------------
  83          * Do init them with default value.
  84          */
  85         for (i = 0; i < report->maxfield; i++) {
  86                 for (j = 0; j < report->field[i]->report_count; j++) {
  87                         report->field[i]->value[j] = 0x00;
  88                         field_count++;
  89                 }
  90         }
  91
  92         if (field_count < 4) {
  93                 hid_err(hid, "not enough fields in the report: %d\n",
  94                                 field_count);
  95                 return -ENODEV;
  96         }
  97
  98         betopff = kzalloc(sizeof(*betopff), GFP_KERNEL);
  99         if (!betopff)
 100                 return -ENOMEM;
 101
 102         set_bit(FF_RUMBLE, dev->ffbit);
 103
 104         error = input_ff_create_memless(dev, betopff, hid_betopff_play);
 105         if (error) {
 106                 kfree(betopff);
 107                 return error;
 108         }
 109
 110         betopff->report = report;
 111         hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
 112
 113         hid_info(hid, "Force feedback for betop devices by huangbo <huangbobupt@163.com>\n");
 114
 115         return 0;
 116 }
 117
 118 static int betop_probe(struct hid_device *hdev, const struct hid_device_id *id)
 119 {
 120         int ret;
 121
 122         if (id->driver_data)
 123                 hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 124
 125         ret = hid_parse(hdev);
 126         if (ret) {
 127                 hid_err(hdev, "parse failed\n");
 128                 goto err;
 129         }
 130
 131         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 132         if (ret) {
 133                 hid_err(hdev, "hw start failed\n");
 134                 goto err;
 135         }
 136
 137         betopff_init(hdev);
 138
 139         return 0;
 140 err:
 141         return ret;
 142 }
 143
 144 static const struct hid_device_id betop_devices[] = {
 145         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185BFM, 0x2208) },
 146         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185PC, 0x5506) },
 147         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2PC, 0x1850) },
 148         { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2BFM, 0x5500) },
 149         { }
 150 };
 151 MODULE_DEVICE_TABLE(hid, betop_devices);
 152
 153 static struct hid_driver betop_driver = {
 154         .name = "betop",
 155         .id_table = betop_devices,
 156         .probe = betop_probe,
 157 };
 158 module_hid_driver(betop_driver);
 159
 160 MODULE_LICENSE("GPL");