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/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 input_dev *dev = hidinput->input;
  72        int i, error;
  73
  74        for (i = 0; i < 4; i++) {
  75                report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
  76                if (!report)
  77                        return -ENODEV;
  78        }
  79
  80        zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
  81        if (!zpff)
  82                return -ENOMEM;
  83
  84        set_bit(FF_RUMBLE, dev->ffbit);
  85
  86        error = input_ff_create_memless(dev, zpff, zpff_play);
  87        if (error) {
  88                kfree(zpff);
  89                return error;
  90        }
  91
  92        zpff->report = report;
  93        zpff->report->field[0]->value[0] = 0x00;
  94        zpff->report->field[1]->value[0] = 0x02;
  95        zpff->report->field[2]->value[0] = 0x00;
  96        zpff->report->field[3]->value[0] = 0x00;
  97        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
  98
  99        hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
 100
 101        return 0;
 102}
 103#else
 104static inline int zpff_init(struct hid_device *hid)
 105{
 106        return 0;
 107}
 108#endif
 109
 110static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 111{
 112        int ret;
 113
 114        ret = hid_parse(hdev);
 115        if (ret) {
 116                hid_err(hdev, "parse failed\n");
 117                goto err;
 118        }
 119
 120        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 121        if (ret) {
 122                hid_err(hdev, "hw start failed\n");
 123                goto err;
 124        }
 125
 126        zpff_init(hdev);
 127
 128        return 0;
 129err:
 130        return ret;
 131}
 132
 133static const struct hid_device_id zp_devices[] = {
 134        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
 135        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
 136        { }
 137};
 138MODULE_DEVICE_TABLE(hid, zp_devices);
 139
 140static struct hid_driver zp_driver = {
 141        .name = "zeroplus",
 142        .id_table = zp_devices,
 143        .probe = zp_probe,
 144};
 145module_hid_driver(zp_driver);
 146
 147MODULE_LICENSE("GPL");
 148