drivers/hid/usbhid/hid-lg2ff.c

   1 /*
   2  *  Force feedback support for Logitech Rumblepad 2
   3  *
   4  *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23
  24 #include <linux/input.h>
  25 #include <linux/usb.h>
  26 #include <linux/hid.h>
  27 #include "usbhid.h"
  28
  29 struct lg2ff_device {
  30         struct hid_report *report;
  31 };
  32
  33 static int play_effect(struct input_dev *dev, void *data,
  34                          struct ff_effect *effect)
  35 {
  36         struct hid_device *hid = input_get_drvdata(dev);
  37         struct lg2ff_device *lg2ff = data;
  38         int weak, strong;
  39
  40         strong = effect->u.rumble.strong_magnitude;
  41         weak = effect->u.rumble.weak_magnitude;
  42
  43         if (weak || strong) {
  44                 weak = weak * 0xff / 0xffff;
  45                 strong = strong * 0xff / 0xffff;
  46
  47                 lg2ff->report->field[0]->value[0] = 0x51;
  48                 lg2ff->report->field[0]->value[2] = weak;
  49                 lg2ff->report->field[0]->value[4] = strong;
  50         } else {
  51                 lg2ff->report->field[0]->value[0] = 0xf3;
  52                 lg2ff->report->field[0]->value[2] = 0x00;
  53                 lg2ff->report->field[0]->value[4] = 0x00;
  54         }
  55
  56         usbhid_submit_report(hid, lg2ff->report, USB_DIR_OUT);
  57         return 0;
  58 }
  59
  60 int hid_lg2ff_init(struct hid_device *hid)
  61 {
  62         struct lg2ff_device *lg2ff;
  63         struct hid_report *report;
  64         struct hid_input *hidinput = list_entry(hid->inputs.next,
  65                                                 struct hid_input, list);
  66         struct list_head *report_list =
  67                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  68         struct input_dev *dev = hidinput->input;
  69         int error;
  70
  71         if (list_empty(report_list)) {
  72                 printk(KERN_ERR "hid-lg2ff: no output report found\n");
  73                 return -ENODEV;
  74         }
  75
  76         report = list_entry(report_list->next, struct hid_report, list);
  77
  78         if (report->maxfield < 1) {
  79                 printk(KERN_ERR "hid-lg2ff: output report is empty\n");
  80                 return -ENODEV;
  81         }
  82         if (report->field[0]->report_count < 7) {
  83                 printk(KERN_ERR "hid-lg2ff: not enough values in the field\n");
  84                 return -ENODEV;
  85         }
  86
  87         lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
  88         if (!lg2ff)
  89                 return -ENOMEM;
  90
  91         set_bit(FF_RUMBLE, dev->ffbit);
  92
  93         error = input_ff_create_memless(dev, lg2ff, play_effect);
  94         if (error) {
  95                 kfree(lg2ff);
  96                 return error;
  97         }
  98
  99         lg2ff->report = report;
 100         report->field[0]->value[0] = 0xf3;
 101         report->field[0]->value[1] = 0x00;
 102         report->field[0]->value[2] = 0x00;
 103         report->field[0]->value[3] = 0x00;
 104         report->field[0]->value[4] = 0x00;
 105         report->field[0]->value[5] = 0x00;
 106         report->field[0]->value[6] = 0x00;
 107
 108         usbhid_submit_report(hid, report, USB_DIR_OUT);
 109
 110         printk(KERN_INFO "Force feedback for Logitech Rumblepad 2 by "
 111                "Anssi Hannula <anssi.hannula@gmail.com>\n");
 112
 113         return 0;
 114 }