drivers/hid/usbhid/hid-zpff.c

   1 /*
   2  *  Force feedback support for Zeroplus based devices
   3  *
   4  *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23
  24 /* #define DEBUG */
  25
  26 #define debug(format, arg...) pr_debug("hid-zpff: " format "\n" , ## arg)
  27
  28 #include <linux/input.h>
  29 #include <linux/usb.h>
  30 #include <linux/hid.h>
  31 #include "usbhid.h"
  32
  33 struct zpff_device {
  34         struct hid_report *report;
  35 };
  36
  37 static int hid_zpff_play(struct input_dev *dev, void *data,
  38                          struct ff_effect *effect)
  39 {
  40         struct hid_device *hid = dev->private;
  41         struct zpff_device *zpff = data;
  42         int left, right;
  43
  44         /*
  45          * The following is specified the other way around in the Zeroplus
  46          * datasheet but the order below is correct for the XFX Executioner;
  47          * however it is possible that the XFX Executioner is an exception
  48          */
  49
  50         left = effect->u.rumble.strong_magnitude;
  51         right = effect->u.rumble.weak_magnitude;
  52         debug("called with 0x%04x 0x%04x", left, right);
  53
  54         left = left * 0x7f / 0xffff;
  55         right = right * 0x7f / 0xffff;
  56
  57         zpff->report->field[2]->value[0] = left;
  58         zpff->report->field[3]->value[0] = right;
  59         debug("running with 0x%02x 0x%02x", left, right);
  60         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  61
  62         return 0;
  63 }
  64
  65 int hid_zpff_init(struct hid_device *hid)
  66 {
  67         struct zpff_device *zpff;
  68         struct hid_report *report;
  69         struct hid_input *hidinput = list_entry(hid->inputs.next,
  70                                                 struct hid_input, list);
  71         struct list_head *report_list =
  72                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  73         struct input_dev *dev = hidinput->input;
  74         int error;
  75
  76         if (list_empty(report_list)) {
  77                 printk(KERN_ERR "hid-zpff: no output report found\n");
  78                 return -ENODEV;
  79         }
  80
  81         report = list_entry(report_list->next, struct hid_report, list);
  82
  83         if (report->maxfield < 4) {
  84                 printk(KERN_ERR "hid-zpff: not enough fields in report\n");
  85                 return -ENODEV;
  86         }
  87
  88         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  89         if (!zpff)
  90                 return -ENOMEM;
  91
  92         set_bit(FF_RUMBLE, dev->ffbit);
  93
  94         error = input_ff_create_memless(dev, zpff, hid_zpff_play);
  95         if (error) {
  96                 kfree(zpff);
  97                 return error;
  98         }
  99
 100         zpff->report = report;
 101         zpff->report->field[0]->value[0] = 0x00;
 102         zpff->report->field[1]->value[0] = 0x02;
 103         zpff->report->field[2]->value[0] = 0x00;
 104         zpff->report->field[3]->value[0] = 0x00;
 105         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 106
 107         printk(KERN_INFO "Force feedback for Zeroplus based devices by "
 108                "Anssi Hannula <anssi.hannula@gmail.com>\n");
 109
 110         return 0;
 111 }