drivers/hid/usbhid/hid-plff.c

   1 /*
   2  *  Force feedback support for PantherLord/GreenAsia 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  *  0810:0001 "Twin USB Joystick"
   8  *   - tested with PantherLord USB/PS2 2in1 Adapter
   9  *   - contains two reports, one for each port (HID_QUIRK_MULTI_INPUT)
  10  *
  11  *  0e8f:0003 "GreenAsia Inc.    USB Joystick     "
  12  *   - tested with Köng Gaming gamepad
  13  *
  14  *  Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
  15  */
  16
  17 /*
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2 of the License, or
  21  * (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  31  */
  32
  33
  34 /* #define DEBUG */
  35
  36 #define debug(format, arg...) pr_debug("hid-plff: " format "\n" , ## arg)
  37
  38 #include <linux/input.h>
  39 #include <linux/usb.h>
  40 #include <linux/hid.h>
  41 #include "usbhid.h"
  42
  43 struct plff_device {
  44         struct hid_report *report;
  45 };
  46
  47 static int hid_plff_play(struct input_dev *dev, void *data,
  48                          struct ff_effect *effect)
  49 {
  50         struct hid_device *hid = input_get_drvdata(dev);
  51         struct plff_device *plff = data;
  52         int left, right;
  53
  54         left = effect->u.rumble.strong_magnitude;
  55         right = effect->u.rumble.weak_magnitude;
  56         debug("called with 0x%04x 0x%04x", left, right);
  57
  58         left = left * 0x7f / 0xffff;
  59         right = right * 0x7f / 0xffff;
  60
  61         plff->report->field[0]->value[2] = left;
  62         plff->report->field[0]->value[3] = right;
  63         debug("running with 0x%02x 0x%02x", left, right);
  64         usbhid_submit_report(hid, plff->report, USB_DIR_OUT);
  65
  66         return 0;
  67 }
  68
  69 int hid_plff_init(struct hid_device *hid)
  70 {
  71         struct plff_device *plff;
  72         struct hid_report *report;
  73         struct hid_input *hidinput;
  74         struct list_head *report_list =
  75                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  76         struct list_head *report_ptr = report_list;
  77         struct input_dev *dev;
  78         int error;
  79
  80         /* The device contains one output report per physical device, all
  81            containing 1 field, which contains 4 ff00.0002 usages and 4 16bit
  82            absolute values.
  83
  84            The input reports also contain a field which contains
  85            8 ff00.0001 usages and 8 boolean values. Their meaning is
  86            currently unknown. */
  87
  88         if (list_empty(report_list)) {
  89                 printk(KERN_ERR "hid-plff: no output reports found\n");
  90                 return -ENODEV;
  91         }
  92
  93         list_for_each_entry(hidinput, &hid->inputs, list) {
  94
  95                 report_ptr = report_ptr->next;
  96
  97                 if (report_ptr == report_list) {
  98                         printk(KERN_ERR "hid-plff: required output report is missing\n");
  99                         return -ENODEV;
 100                 }
 101
 102                 report = list_entry(report_ptr, struct hid_report, list);
 103                 if (report->maxfield < 1) {
 104                         printk(KERN_ERR "hid-plff: no fields in the report\n");
 105                         return -ENODEV;
 106                 }
 107
 108                 if (report->field[0]->report_count < 4) {
 109                         printk(KERN_ERR "hid-plff: not enough values in the field\n");
 110                         return -ENODEV;
 111                 }
 112
 113                 plff = kzalloc(sizeof(struct plff_device), GFP_KERNEL);
 114                 if (!plff)
 115                         return -ENOMEM;
 116
 117                 dev = hidinput->input;
 118
 119                 set_bit(FF_RUMBLE, dev->ffbit);
 120
 121                 error = input_ff_create_memless(dev, plff, hid_plff_play);
 122                 if (error) {
 123                         kfree(plff);
 124                         return error;
 125                 }
 126
 127                 plff->report = report;
 128                 plff->report->field[0]->value[0] = 0x00;
 129                 plff->report->field[0]->value[1] = 0x00;
 130                 plff->report->field[0]->value[2] = 0x00;
 131                 plff->report->field[0]->value[3] = 0x00;
 132                 usbhid_submit_report(hid, plff->report, USB_DIR_OUT);
 133         }
 134
 135         printk(KERN_INFO "hid-plff: Force feedback for PantherLord/GreenAsia "
 136                "devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
 137
 138         return 0;
 139 }