linux/drivers/hid/hid-zpff.c
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   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/slab.h>
  27#include <linux/usb.h>
  28#include <linux/module.h>
  29
  30#include "hid-ids.h"
  31
  32#ifdef CONFIG_ZEROPLUS_FF
  33#include "usbhid/usbhid.h"
  34
  35struct zpff_device {
  36        struct hid_report *report;
  37};
  38
  39static int zpff_play(struct input_dev *dev, void *data,
  40                         struct ff_effect *effect)
  41{
  42        struct hid_device *hid = input_get_drvdata(dev);
  43        struct zpff_device *zpff = data;
  44        int left, right;
  45
  46        /*
  47         * The following is specified the other way around in the Zeroplus
  48         * datasheet but the order below is correct for the XFX Executioner;
  49         * however it is possible that the XFX Executioner is an exception
  50         */
  51
  52        left = effect->u.rumble.strong_magnitude;
  53        right = effect->u.rumble.weak_magnitude;
  54        dbg_hid("called with 0x%04x 0x%04x\n", left, right);
  55
  56        left = left * 0x7f / 0xffff;
  57        right = right * 0x7f / 0xffff;
  58
  59        zpff->report->field[2]->value[0] = left;
  60        zpff->report->field[3]->value[0] = right;
  61        dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  62        usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
  63
  64        return 0;
  65}
  66
  67static int zpff_init(struct hid_device *hid)
  68{
  69        struct zpff_device *zpff;
  70        struct hid_report *report;
  71        struct hid_input *hidinput = list_entry(hid->inputs.next,
  72                                                struct hid_input, list);
  73        struct list_head *report_list =
  74                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  75        struct input_dev *dev = hidinput->input;
  76        int error;
  77
  78        if (list_empty(report_list)) {
  79                hid_err(hid, "no output report found\n");
  80                return -ENODEV;
  81        }
  82
  83        report = list_entry(report_list->next, struct hid_report, list);
  84
  85        if (report->maxfield < 4) {
  86                hid_err(hid, "not enough fields in report\n");
  87                return -ENODEV;
  88        }
  89
  90        zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  91        if (!zpff)
  92                return -ENOMEM;
  93
  94        set_bit(FF_RUMBLE, dev->ffbit);
  95
  96        error = input_ff_create_memless(dev, zpff, zpff_play);
  97        if (error) {
  98                kfree(zpff);
  99                return error;
 100        }
 101
 102        zpff->report = report;
 103        zpff->report->field[0]->value[0] = 0x00;
 104        zpff->report->field[1]->value[0] = 0x02;
 105        zpff->report->field[2]->value[0] = 0x00;
 106        zpff->report->field[3]->value[0] = 0x00;
 107        usbhid_submit_report(hid, zpff->report, USB_DIR_OUT);
 108
 109        hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
 110
 111        return 0;
 112}
 113#else
 114static inline int zpff_init(struct hid_device *hid)
 115{
 116        return 0;
 117}
 118#endif
 119
 120static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 121{
 122        int ret;
 123
 124        ret = hid_parse(hdev);
 125        if (ret) {
 126                hid_err(hdev, "parse failed\n");
 127                goto err;
 128        }
 129
 130        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 131        if (ret) {
 132                hid_err(hdev, "hw start failed\n");
 133                goto err;
 134        }
 135
 136        zpff_init(hdev);
 137
 138        return 0;
 139err:
 140        return ret;
 141}
 142
 143static const struct hid_device_id zp_devices[] = {
 144        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 145        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 146        { }
 147};
 148MODULE_DEVICE_TABLE(hid, zp_devices);
 149
 150static struct hid_driver zp_driver = {
 151        .name = "zeroplus",
 152        .id_table = zp_devices,
 153        .probe = zp_probe,
 154};
 155
 156static int __init zp_init(void)
 157{
 158        return hid_register_driver(&zp_driver);
 159}
 160
 161static void __exit zp_exit(void)
 162{
 163        hid_unregister_driver(&zp_driver);
 164}
 165
 166module_init(zp_init);
 167module_exit(zp_exit);
 168MODULE_LICENSE("GPL");
 169
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