drivers/hid/usbhid/hid-ff.c

   1 /*
   2  *  Force feedback support for hid devices.
   3  *  Not all hid devices use the same protocol. For example, some use PID,
   4  *  other use their own proprietary procotol.
   5  *
   6  *  Copyright (c) 2002-2004 Johann Deneux
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  * Should you need to contact me, the author, you can do so by
  25  * e-mail - mail your message to <johann.deneux@it.uu.se>
  26  */
  27
  28 #include <linux/input.h>
  29
  30 #undef DEBUG
  31 #include <linux/usb.h>
  32
  33 #include <linux/hid.h>
  34 #include "usbhid.h"
  35
  36 /*
  37  * This table contains pointers to initializers. To add support for new
  38  * devices, you need to add the USB vendor and product ids here.
  39  */
  40 struct hid_ff_initializer {
  41         u16 idVendor;
  42         u16 idProduct;
  43         int (*init)(struct hid_device*);
  44 };
  45
  46 /*
  47  * We try pidff when no other driver is found because PID is the
  48  * standards compliant way of implementing force feedback in HID.
  49  * pidff_init() will quickly abort if the device doesn't appear to
  50  * be a PID device
  51  */
  52 static struct hid_ff_initializer inits[] = {
  53 #ifdef CONFIG_ZEROPLUS_FF
  54         { 0xc12, 0x0005, hid_zpff_init },
  55         { 0xc12, 0x0030, hid_zpff_init },
  56 #endif
  57         { 0,     0,      hid_pidff_init}  /* Matches anything */
  58 };
  59
  60 int hid_ff_init(struct hid_device* hid)
  61 {
  62         struct hid_ff_initializer *init;
  63         int vendor = le16_to_cpu(hid_to_usb_dev(hid)->descriptor.idVendor);
  64         int product = le16_to_cpu(hid_to_usb_dev(hid)->descriptor.idProduct);
  65
  66         for (init = inits; init->idVendor; init++)
  67                 if (init->idVendor == vendor && init->idProduct == product)
  68                         break;
  69
  70         return init->init(hid);
  71 }
  72 EXPORT_SYMBOL_GPL(hid_ff_init);
  73