drivers/usb/input/hid-lgff.c

   1 /*
   2  * Force feedback support for hid-compliant for some of the devices from
   3  * Logitech, namely:
   4  * - WingMan Cordless RumblePad
   5  * - WingMan Force 3D
   6  *
   7  *  Copyright (c) 2002-2004 Johann Deneux
   8  *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so by
  27  * e-mail - mail your message to <johann.deneux@it.uu.se>
  28  */
  29
  30 #include <linux/input.h>
  31 #include <linux/usb.h>
  32 #include <linux/hid.h>
  33 #include "usbhid.h"
  34
  35 struct dev_type {
  36         u16 idVendor;
  37         u16 idProduct;
  38         const signed short *ff;
  39 };
  40
  41 static const signed short ff_rumble[] = {
  42         FF_RUMBLE,
  43         -1
  44 };
  45
  46 static const signed short ff_joystick[] = {
  47         FF_CONSTANT,
  48         -1
  49 };
  50
  51 static const struct dev_type devices[] = {
  52         { 0x046d, 0xc211, ff_rumble },
  53         { 0x046d, 0xc219, ff_rumble },
  54         { 0x046d, 0xc283, ff_joystick },
  55         { 0x046d, 0xca03, ff_joystick },
  56         { 0x0000, 0x0000, ff_joystick }
  57 };
  58
  59 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  60 {
  61         struct hid_device *hid = dev->private;
  62         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  63         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
  64         int x, y;
  65         unsigned int left, right;
  66
  67 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
  68
  69         switch (effect->type) {
  70         case FF_CONSTANT:
  71                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
  72                 y = effect->u.ramp.end_level + 0x7f;
  73                 CLAMP(x);
  74                 CLAMP(y);
  75                 report->field[0]->value[0] = 0x51;
  76                 report->field[0]->value[1] = 0x08;
  77                 report->field[0]->value[2] = x;
  78                 report->field[0]->value[3] = y;
  79                 dbg("(x, y)=(%04x, %04x)", x, y);
  80                 usbhid_submit_report(hid, report, USB_DIR_OUT);
  81                 break;
  82
  83         case FF_RUMBLE:
  84                 right = effect->u.rumble.strong_magnitude;
  85                 left = effect->u.rumble.weak_magnitude;
  86                 right = right * 0xff / 0xffff;
  87                 left = left * 0xff / 0xffff;
  88                 CLAMP(left);
  89                 CLAMP(right);
  90                 report->field[0]->value[0] = 0x42;
  91                 report->field[0]->value[1] = 0x00;
  92                 report->field[0]->value[2] = left;
  93                 report->field[0]->value[3] = right;
  94                 dbg("(left, right)=(%04x, %04x)", left, right);
  95                 usbhid_submit_report(hid, report, USB_DIR_OUT);
  96                 break;
  97         }
  98         return 0;
  99 }
 100
 101 int hid_lgff_init(struct hid_device* hid)
 102 {
 103         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 104         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 105         struct input_dev *dev = hidinput->input;
 106         struct hid_report *report;
 107         struct hid_field *field;
 108         int error;
 109         int i, j;
 110
 111         /* Find the report to use */
 112         if (list_empty(report_list)) {
 113                 err("No output report found");
 114                 return -1;
 115         }
 116
 117         /* Check that the report looks ok */
 118         report = list_entry(report_list->next, struct hid_report, list);
 119         if (!report) {
 120                 err("NULL output report");
 121                 return -1;
 122         }
 123
 124         field = report->field[0];
 125         if (!field) {
 126                 err("NULL field");
 127                 return -1;
 128         }
 129
 130         for (i = 0; i < ARRAY_SIZE(devices); i++) {
 131                 if (dev->id.vendor == devices[i].idVendor &&
 132                     dev->id.product == devices[i].idProduct) {
 133                         for (j = 0; devices[i].ff[j] >= 0; j++)
 134                                 set_bit(devices[i].ff[j], dev->ffbit);
 135                         break;
 136                 }
 137         }
 138
 139         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 140         if (error)
 141                 return error;
 142
 143         printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 144
 145         return 0;
 146 }