LXR linux/drivers/hid/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/hid.h>
  25#include <linux/input.h>
  26#include <linux/usb.h>
  27
  28#include "hid-ids.h"
  29
  30#include "usbhid/usbhid.h"
  31
  32struct zpff_device {
  33        struct hid_report *report;
  34};
  35
  36static int zpff_play(struct input_dev *dev, void *data,
  37                         struct ff_effect *effect)
  38{
  39        struct hid_device *hid = input_get_drvdata(dev);
  40        struct zpff_device *zpff = data;
  41        int left, right;
  42
  43        /*
  44         * The following is specified the other way around in the Zeroplus
  45         * datasheet but the order below is correct for the XFX Executioner;
  46         * however it is possible that the XFX Executioner is an exception
  47         */
  48
  49        left = effect->u.rumble.strong_magnitude;
  50        right = effect->u.rumble.weak_magnitude;
  51        dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  52
  53        left = left * 0x7f / 0xffff;
  54        right = right * 0x7f / 0xffff;
  55
  56        zpff->report->field[2]->value[0] = left;
  57        zpff->report->field[3]->value[0] = right;
  58        dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  59        usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  60
  61        return 0;
  62}
  63
  64static int zpff_init(struct hid_device *hid)
  65{
  66        struct zpff_device *zpff;
  67        struct hid_report *report;
  68        struct hid_input *hidinput = list_entry(hid->inputs.next,
  69                                                struct hid_input, list);
  70        struct list_head *report_list =
  71                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  72        struct input_dev *dev = hidinput->input;
  73        int error;
  74
  75        if (list_empty(report_list)) {
  76                dev_err(&hid->dev, "no output report found\n");
  77                return -ENODEV;
  78        }
  79
  80        report = list_entry(report_list->next, struct hid_report, list);
  81
  82        if (report->maxfield < 4) {
  83                dev_err(&hid->dev, "not enough fields in report\n");
  84                return -ENODEV;
  85        }
  86
  87        zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  88        if (!zpff)
  89                return -ENOMEM;
  90
  91        set_bit(FF_RUMBLE, dev->ffbit);
  92
  93        error = input_ff_create_memless(dev, zpff, zpff_play);
  94        if (error) {
  95                kfree(zpff);
  96                return error;
  97        }
  98
  99        zpff->report = report;
 100        zpff->report->field[0]->value[0] = 0x00;
 101        zpff->report->field[1]->value[0] = 0x02;
 102        zpff->report->field[2]->value[0] = 0x00;
 103        zpff->report->field[3]->value[0] = 0x00;
 104        usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 105
 106        dev_info(&hid->dev, "force feedback for Zeroplus based devices by "
 107               "Anssi Hannula <anssi.hannula@gmail.com>\n");
 108
 109        return 0;
 110}
 111
 112static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 113{
 114        int ret;
 115
 116        ret = hid_parse(hdev);
 117        if (ret) {
 118                dev_err(&hdev->dev, "parse failed\n");
 119                goto err;
 120        }
 121
 122        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 123        if (ret) {
 124                dev_err(&hdev->dev, "hw start failed\n");
 125                goto err;
 126        }
 127
 128        zpff_init(hdev);
 129
 130        return 0;
 131err:
 132        return ret;
 133}
 134
 135static const struct hid_device_id zp_devices[] = {
 136        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 137        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 138        { }
 139};
 140MODULE_DEVICE_TABLE(hid, zp_devices);
 141
 142static struct hid_driver zp_driver = {
 143        .name = "zeroplus",
 144        .id_table = zp_devices,
 145        .probe = zp_probe,
 146};
 147
 148static int zp_init(void)
 149{
 150        return hid_register_driver(&zp_driver);
 151}
 152
 153static void zp_exit(void)
 154{
 155        hid_unregister_driver(&zp_driver);
 156}
 157
 158module_init(zp_init);
 159module_exit(zp_exit);
 160MODULE_LICENSE("GPL");
 161