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/module.h>
  28
  29#include "hid-ids.h"
  30
  31#ifdef CONFIG_ZEROPLUS_FF
  32
  33struct zpff_device {
  34        struct hid_report *report;
  35};
  36
  37static int zpff_play(struct input_dev *dev, void *data,
  38                         struct ff_effect *effect)
  39{
  40        struct hid_device *hid = input_get_drvdata(dev);
  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        dbg_hid("called with 0x%04x 0x%04x\n", 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        dbg_hid("running with 0x%02x 0x%02x\n", left, right);
  60        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  61
  62        return 0;
  63}
  64
  65static int 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                hid_err(hid, "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                hid_err(hid, "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, 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        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
 106
 107        hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
 108
 109        return 0;
 110}
 111#else
 112static inline int zpff_init(struct hid_device *hid)
 113{
 114        return 0;
 115}
 116#endif
 117
 118static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 119{
 120        int ret;
 121
 122        ret = hid_parse(hdev);
 123        if (ret) {
 124                hid_err(hdev, "parse failed\n");
 125                goto err;
 126        }
 127
 128        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 129        if (ret) {
 130                hid_err(hdev, "hw start failed\n");
 131                goto err;
 132        }
 133
 134        zpff_init(hdev);
 135
 136        return 0;
 137err:
 138        return ret;
 139}
 140
 141static const struct hid_device_id zp_devices[] = {
 142        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 143        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 144        { }
 145};
 146MODULE_DEVICE_TABLE(hid, zp_devices);
 147
 148static struct hid_driver zp_driver = {
 149        .name = "zeroplus",
 150        .id_table = zp_devices,
 151        .probe = zp_probe,
 152};
 153module_hid_driver(zp_driver);
 154
 155MODULE_LICENSE("GPL");
 156
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