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 #include <linux/input.h>
  25 #include <linux/usb.h>
  26 #include <linux/hid.h>
  27 #include "usbhid.h"
  28
  29 struct zpff_device {
  30         struct hid_report *report;
  31 };
  32
  33 static int hid_zpff_play(struct input_dev *dev, void *data,
  34                          struct ff_effect *effect)
  35 {
  36         struct hid_device *hid = input_get_drvdata(dev);
  37         struct zpff_device *zpff = data;
  38         int left, right;
  39
  40         /*
  41          * The following is specified the other way around in the Zeroplus
  42          * datasheet but the order below is correct for the XFX Executioner;
  43          * however it is possible that the XFX Executioner is an exception
  44          */
  45
  46         left = effect->u.rumble.strong_magnitude;
  47         right = effect->u.rumble.weak_magnitude;
  48         dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  49
  50         left = left * 0x7f / 0xffff;
  51         right = right * 0x7f / 0xffff;
  52
  53         zpff->report->field[2]->value[0] = left;
  54         zpff->report->field[3]->value[0] = right;
  55         dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  56         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  57
  58         return 0;
  59 }
  60
  61 int hid_zpff_init(struct hid_device *hid)
  62 {
  63         struct zpff_device *zpff;
  64         struct hid_report *report;
  65         struct hid_input *hidinput = list_entry(hid->inputs.next,
  66                                                 struct hid_input, list);
  67         struct list_head *report_list =
  68                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  69         struct input_dev *dev = hidinput->input;
  70         int error;
  71
  72         if (list_empty(report_list)) {
  73                 printk(KERN_ERR "hid-zpff: no output report found\n");
  74                 return -ENODEV;
  75         }
  76
  77         report = list_entry(report_list->next, struct hid_report, list);
  78
  79         if (report->maxfield < 4) {
  80                 printk(KERN_ERR "hid-zpff: not enough fields in report\n");
  81                 return -ENODEV;
  82         }
  83
  84         zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  85         if (!zpff)
  86                 return -ENOMEM;
  87
  88         set_bit(FF_RUMBLE, dev->ffbit);
  89
  90         error = input_ff_create_memless(dev, zpff, hid_zpff_play);
  91         if (error) {
  92                 kfree(zpff);
  93                 return error;
  94         }
  95
  96         zpff->report = report;
  97         zpff->report->field[0]->value[0] = 0x00;
  98         zpff->report->field[1]->value[0] = 0x02;
  99         zpff->report->field[2]->value[0] = 0x00;
 100         zpff->report->field[3]->value[0] = 0x00;
 101         usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 102
 103         printk(KERN_INFO "Force feedback for Zeroplus based devices by "
 104                "Anssi Hannula <anssi.hannula@gmail.com>\n");
 105
 106         return 0;
 107 }