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 "hid.h"
  33
  34 struct device_type {
  35         u16 idVendor;
  36         u16 idProduct;
  37         const signed short *ff;
  38 };
  39
  40 static const signed short ff_rumble[] = {
  41         FF_RUMBLE,
  42         -1
  43 };
  44
  45 static const signed short ff_joystick[] = {
  46         FF_CONSTANT,
  47         -1
  48 };
  49
  50 static const struct device_type devices[] = {
  51         { 0x046d, 0xc211, ff_rumble },
  52         { 0x046d, 0xc219, ff_rumble },
  53         { 0x046d, 0xc283, ff_joystick },
  54         { 0x0000, 0x0000, ff_joystick }
  55 };
  56
  57 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  58 {
  59         struct hid_device *hid = dev->private;
  60         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  61         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
  62         int x, y;
  63         unsigned int left, right;
  64
  65 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
  66
  67         switch (effect->type) {
  68         case FF_CONSTANT:
  69                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
  70                 y = effect->u.ramp.end_level + 0x7f;
  71                 CLAMP(x);
  72                 CLAMP(y);
  73                 report->field[0]->value[0] = 0x51;
  74                 report->field[0]->value[1] = 0x08;
  75                 report->field[0]->value[2] = x;
  76                 report->field[0]->value[3] = y;
  77                 dbg("(x, y)=(%04x, %04x)", x, y);
  78                 hid_submit_report(hid, report, USB_DIR_OUT);
  79                 break;
  80
  81         case FF_RUMBLE:
  82                 right = effect->u.rumble.strong_magnitude;
  83                 left = effect->u.rumble.weak_magnitude;
  84                 right = right * 0xff / 0xffff;
  85                 left = left * 0xff / 0xffff;
  86                 CLAMP(left);
  87                 CLAMP(right);
  88                 report->field[0]->value[0] = 0x42;
  89                 report->field[0]->value[1] = 0x00;
  90                 report->field[0]->value[2] = left;
  91                 report->field[0]->value[3] = right;
  92                 dbg("(left, right)=(%04x, %04x)", left, right);
  93                 hid_submit_report(hid, report, USB_DIR_OUT);
  94                 break;
  95         }
  96         return 0;
  97 }
  98
  99 int hid_lgff_init(struct hid_device* hid)
 100 {
 101         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 102         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 103         struct input_dev *dev = hidinput->input;
 104         struct hid_report *report;
 105         struct hid_field *field;
 106         int error;
 107         int i, j;
 108
 109         /* Find the report to use */
 110         if (list_empty(report_list)) {
 111                 err("No output report found");
 112                 return -1;
 113         }
 114
 115         /* Check that the report looks ok */
 116         report = list_entry(report_list->next, struct hid_report, list);
 117         if (!report) {
 118                 err("NULL output report");
 119                 return -1;
 120         }
 121
 122         field = report->field[0];
 123         if (!field) {
 124                 err("NULL field");
 125                 return -1;
 126         }
 127
 128         for (i = 0; i < ARRAY_SIZE(devices); i++) {
 129                 if (dev->id.vendor == devices[i].idVendor &&
 130                     dev->id.product == devices[i].idProduct) {
 131                         for (j = 0; devices[i].ff[j] >= 0; j++)
 132                                 set_bit(devices[i].ff[j], dev->ffbit);
 133                         break;
 134                 }
 135         }
 136
 137         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 138         if (error)
 139                 return error;
 140
 141         printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 142
 143         return 0;
 144 }