drivers/hid/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
  34 #include "usbhid/usbhid.h"
  35 #include "hid-lg.h"
  36
  37 struct dev_type {
  38         u16 idVendor;
  39         u16 idProduct;
  40         const signed short *ff;
  41 };
  42
  43 static const signed short ff_rumble[] = {
  44         FF_RUMBLE,
  45         -1
  46 };
  47
  48 static const signed short ff_joystick[] = {
  49         FF_CONSTANT,
  50         -1
  51 };
  52
  53 static const struct dev_type devices[] = {
  54         { 0x046d, 0xc211, ff_rumble },
  55         { 0x046d, 0xc219, ff_rumble },
  56         { 0x046d, 0xc283, ff_joystick },
  57         { 0x046d, 0xc286, ff_joystick },
  58         { 0x046d, 0xc294, ff_joystick },
  59         { 0x046d, 0xc295, ff_joystick },
  60         { 0x046d, 0xca03, ff_joystick },
  61 };
  62
  63 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  64 {
  65         struct hid_device *hid = input_get_drvdata(dev);
  66         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  67         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
  68         int x, y;
  69         unsigned int left, right;
  70
  71 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
  72
  73         switch (effect->type) {
  74         case FF_CONSTANT:
  75                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
  76                 y = effect->u.ramp.end_level + 0x7f;
  77                 CLAMP(x);
  78                 CLAMP(y);
  79                 report->field[0]->value[0] = 0x51;
  80                 report->field[0]->value[1] = 0x08;
  81                 report->field[0]->value[2] = x;
  82                 report->field[0]->value[3] = y;
  83                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
  84                 usbhid_submit_report(hid, report, USB_DIR_OUT);
  85                 break;
  86
  87         case FF_RUMBLE:
  88                 right = effect->u.rumble.strong_magnitude;
  89                 left = effect->u.rumble.weak_magnitude;
  90                 right = right * 0xff / 0xffff;
  91                 left = left * 0xff / 0xffff;
  92                 CLAMP(left);
  93                 CLAMP(right);
  94                 report->field[0]->value[0] = 0x42;
  95                 report->field[0]->value[1] = 0x00;
  96                 report->field[0]->value[2] = left;
  97                 report->field[0]->value[3] = right;
  98                 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
  99                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 100                 break;
 101         }
 102         return 0;
 103 }
 104
 105 int lgff_init(struct hid_device* hid)
 106 {
 107         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 108         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 109         struct input_dev *dev = hidinput->input;
 110         struct hid_report *report;
 111         struct hid_field *field;
 112         const signed short *ff_bits = ff_joystick;
 113         int error;
 114         int i;
 115
 116         /* Find the report to use */
 117         if (list_empty(report_list)) {
 118                 err_hid("No output report found");
 119                 return -1;
 120         }
 121
 122         /* Check that the report looks ok */
 123         report = list_entry(report_list->next, struct hid_report, list);
 124         if (!report) {
 125                 err_hid("NULL output report");
 126                 return -1;
 127         }
 128
 129         field = report->field[0];
 130         if (!field) {
 131                 err_hid("NULL field");
 132                 return -1;
 133         }
 134
 135         for (i = 0; i < ARRAY_SIZE(devices); i++) {
 136                 if (dev->id.vendor == devices[i].idVendor &&
 137                     dev->id.product == devices[i].idProduct) {
 138                         ff_bits = devices[i].ff;
 139                         break;
 140                 }
 141         }
 142
 143         for (i = 0; ff_bits[i] >= 0; i++)
 144                 set_bit(ff_bits[i], dev->ffbit);
 145
 146         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 147         if (error)
 148                 return error;
 149
 150         printk(KERN_INFO "Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 151
 152         return 0;
 153 }