linux/drivers/hid/hid-emsff.c
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   1/*
   2 *  Force feedback support for EMS Trio Linker Plus II
   3 *
   4 *  Copyright (c) 2010 Ignaz Forster <ignaz.forster@gmx.de>
   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/hid.h>
  25#include <linux/input.h>
  26#include <linux/usb.h>
  27#include <linux/module.h>
  28
  29#include "hid-ids.h"
  30#include "usbhid/usbhid.h"
  31
  32struct emsff_device {
  33        struct hid_report *report;
  34};
  35
  36static int emsff_play(struct input_dev *dev, void *data,
  37                         struct ff_effect *effect)
  38{
  39        struct hid_device *hid = input_get_drvdata(dev);
  40        struct emsff_device *emsff = data;
  41        int weak, strong;
  42
  43        weak = effect->u.rumble.weak_magnitude;
  44        strong = effect->u.rumble.strong_magnitude;
  45
  46        dbg_hid("called with 0x%04x 0x%04x\n", strong, weak);
  47
  48        weak = weak * 0xff / 0xffff;
  49        strong = strong * 0xff / 0xffff;
  50
  51        emsff->report->field[0]->value[1] = weak;
  52        emsff->report->field[0]->value[2] = strong;
  53
  54        dbg_hid("running with 0x%02x 0x%02x\n", strong, weak);
  55        usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
  56
  57        return 0;
  58}
  59
  60static int emsff_init(struct hid_device *hid)
  61{
  62        struct emsff_device *emsff;
  63        struct hid_report *report;
  64        struct hid_input *hidinput = list_first_entry(&hid->inputs,
  65                                                struct hid_input, list);
  66        struct list_head *report_list =
  67                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  68        struct input_dev *dev = hidinput->input;
  69        int error;
  70
  71        if (list_empty(report_list)) {
  72                hid_err(hid, "no output reports found\n");
  73                return -ENODEV;
  74        }
  75
  76        report = list_first_entry(report_list, struct hid_report, list);
  77        if (report->maxfield < 1) {
  78                hid_err(hid, "no fields in the report\n");
  79                return -ENODEV;
  80        }
  81
  82        if (report->field[0]->report_count < 7) {
  83                hid_err(hid, "not enough values in the field\n");
  84                return -ENODEV;
  85        }
  86
  87        emsff = kzalloc(sizeof(struct emsff_device), GFP_KERNEL);
  88        if (!emsff)
  89                return -ENOMEM;
  90
  91        set_bit(FF_RUMBLE, dev->ffbit);
  92
  93        error = input_ff_create_memless(dev, emsff, emsff_play);
  94        if (error) {
  95                kfree(emsff);
  96                return error;
  97        }
  98
  99        emsff->report = report;
 100        emsff->report->field[0]->value[0] = 0x01;
 101        emsff->report->field[0]->value[1] = 0x00;
 102        emsff->report->field[0]->value[2] = 0x00;
 103        emsff->report->field[0]->value[3] = 0x00;
 104        emsff->report->field[0]->value[4] = 0x00;
 105        emsff->report->field[0]->value[5] = 0x00;
 106        emsff->report->field[0]->value[6] = 0x00;
 107        usbhid_submit_report(hid, emsff->report, USB_DIR_OUT);
 108
 109        hid_info(hid, "force feedback for EMS based devices by Ignaz Forster <ignaz.forster@gmx.de>\n");
 110
 111        return 0;
 112}
 113
 114static int ems_probe(struct hid_device *hdev, const struct hid_device_id *id)
 115{
 116        int ret;
 117
 118        ret = hid_parse(hdev);
 119        if (ret) {
 120                hid_err(hdev, "parse failed\n");
 121                goto err;
 122        }
 123
 124        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 125        if (ret) {
 126                hid_err(hdev, "hw start failed\n");
 127                goto err;
 128        }
 129
 130        ret = emsff_init(hdev);
 131        if (ret) {
 132                dev_err(&hdev->dev, "force feedback init failed\n");
 133                hid_hw_stop(hdev);
 134                goto err;
 135        }
 136
 137        return 0;
 138err:
 139        return ret;
 140}
 141
 142static const struct hid_device_id ems_devices[] = {
 143        { HID_USB_DEVICE(USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II) },
 144        { }
 145};
 146MODULE_DEVICE_TABLE(hid, ems_devices);
 147
 148static struct hid_driver ems_driver = {
 149        .name = "hkems",
 150        .id_table = ems_devices,
 151        .probe = ems_probe,
 152};
 153
 154static int ems_init(void)
 155{
 156        return hid_register_driver(&ems_driver);
 157}
 158
 159static void ems_exit(void)
 160{
 161        hid_unregister_driver(&ems_driver);
 162}
 163
 164module_init(ems_init);
 165module_exit(ems_exit);
 166MODULE_LICENSE("GPL");
 167
 168
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