drivers/hid/hid-drff.c

   1 /*
   2  * Force feedback support for DragonRise Inc. game controllers
   3  *
   4  * From what I have gathered, these devices are mass produced in China and are
   5  * distributed under several vendors. They often share the same design as
   6  * the original PlayStation DualShock controller.
   7  *
   8  * 0079:0006 "DragonRise Inc.   Generic   USB  Joystick  "
   9  *  - tested with a Tesun USB-703 game controller.
  10  *
  11  * Copyright (c) 2009 Richard Walmsley <richwalm@gmail.com>
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  */
  29
  30 #include <linux/input.h>
  31 #include <linux/usb.h>
  32 #include <linux/hid.h>
  33
  34 #include "hid-ids.h"
  35 #include "usbhid/usbhid.h"
  36
  37 struct drff_device {
  38         struct hid_report *report;
  39 };
  40
  41 static int drff_play(struct input_dev *dev, void *data,
  42                                  struct ff_effect *effect)
  43 {
  44         struct hid_device *hid = input_get_drvdata(dev);
  45         struct drff_device *drff = data;
  46         int strong, weak;
  47
  48         strong = effect->u.rumble.strong_magnitude;
  49         weak = effect->u.rumble.weak_magnitude;
  50
  51         dbg_hid("called with 0x%04x 0x%04x", strong, weak);
  52
  53         if (strong || weak) {
  54                 strong = strong * 0xff / 0xffff;
  55                 weak = weak * 0xff / 0xffff;
  56
  57                 /* While reverse engineering this device, I found that when
  58                    this value is set, it causes the strong rumble to function
  59                    at a near maximum speed, so we'll bypass it. */
  60                 if (weak == 0x0a)
  61                         weak = 0x0b;
  62
  63                 drff->report->field[0]->value[0] = 0x51;
  64                 drff->report->field[0]->value[1] = 0x00;
  65                 drff->report->field[0]->value[2] = weak;
  66                 drff->report->field[0]->value[4] = strong;
  67                 usbhid_submit_report(hid, drff->report, USB_DIR_OUT);
  68
  69                 drff->report->field[0]->value[0] = 0xfa;
  70                 drff->report->field[0]->value[1] = 0xfe;
  71         } else {
  72                 drff->report->field[0]->value[0] = 0xf3;
  73                 drff->report->field[0]->value[1] = 0x00;
  74         }
  75
  76         drff->report->field[0]->value[2] = 0x00;
  77         drff->report->field[0]->value[4] = 0x00;
  78         dbg_hid("running with 0x%02x 0x%02x", strong, weak);
  79         usbhid_submit_report(hid, drff->report, USB_DIR_OUT);
  80
  81         return 0;
  82 }
  83
  84 static int drff_init(struct hid_device *hid)
  85 {
  86         struct drff_device *drff;
  87         struct hid_report *report;
  88         struct hid_input *hidinput = list_first_entry(&hid->inputs,
  89                                                 struct hid_input, list);
  90         struct list_head *report_list =
  91                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  92         struct input_dev *dev = hidinput->input;
  93         int error;
  94
  95         if (list_empty(report_list)) {
  96                 dev_err(&hid->dev, "no output reports found\n");
  97                 return -ENODEV;
  98         }
  99
 100         report = list_first_entry(report_list, struct hid_report, list);
 101         if (report->maxfield < 1) {
 102                 dev_err(&hid->dev, "no fields in the report\n");
 103                 return -ENODEV;
 104         }
 105
 106         if (report->field[0]->report_count < 7) {
 107                 dev_err(&hid->dev, "not enough values in the field\n");
 108                 return -ENODEV;
 109         }
 110
 111         drff = kzalloc(sizeof(struct drff_device), GFP_KERNEL);
 112         if (!drff)
 113                 return -ENOMEM;
 114
 115         set_bit(FF_RUMBLE, dev->ffbit);
 116
 117         error = input_ff_create_memless(dev, drff, drff_play);
 118         if (error) {
 119                 kfree(drff);
 120                 return error;
 121         }
 122
 123         drff->report = report;
 124         drff->report->field[0]->value[0] = 0xf3;
 125         drff->report->field[0]->value[1] = 0x00;
 126         drff->report->field[0]->value[2] = 0x00;
 127         drff->report->field[0]->value[3] = 0x00;
 128         drff->report->field[0]->value[4] = 0x00;
 129         drff->report->field[0]->value[5] = 0x00;
 130         drff->report->field[0]->value[6] = 0x00;
 131         usbhid_submit_report(hid, drff->report, USB_DIR_OUT);
 132
 133         dev_info(&hid->dev, "Force Feedback for DragonRise Inc. game "
 134                "controllers by Richard Walmsley <richwalm@gmail.com>\n");
 135
 136         return 0;
 137 }
 138
 139 static int dr_probe(struct hid_device *hdev, const struct hid_device_id *id)
 140 {
 141         int ret;
 142
 143         dev_dbg(&hdev->dev, "DragonRise Inc. HID hardware probe...");
 144
 145         ret = hid_parse(hdev);
 146         if (ret) {
 147                 dev_err(&hdev->dev, "parse failed\n");
 148                 goto err;
 149         }
 150
 151         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 152         if (ret) {
 153                 dev_err(&hdev->dev, "hw start failed\n");
 154                 goto err;
 155         }
 156
 157         drff_init(hdev);
 158
 159         return 0;
 160 err:
 161         return ret;
 162 }
 163
 164 static const struct hid_device_id dr_devices[] = {
 165         { HID_USB_DEVICE(USB_VENDOR_ID_DRAGONRISE, 0x0006),  },
 166         { }
 167 };
 168 MODULE_DEVICE_TABLE(hid, dr_devices);
 169
 170 static struct hid_driver dr_driver = {
 171         .name = "dragonrise",
 172         .id_table = dr_devices,
 173         .probe = dr_probe,
 174 };
 175
 176 static int __init dr_init(void)
 177 {
 178         return hid_register_driver(&dr_driver);
 179 }
 180
 181 static void __exit dr_exit(void)
 182 {
 183         hid_unregister_driver(&dr_driver);
 184 }
 185
 186 module_init(dr_init);
 187 module_exit(dr_exit);
 188 MODULE_LICENSE("GPL");