linux/drivers/hid/hid-axff.c
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   1/*
   2 * Force feedback support for ACRUX game controllers
   3 *
   4 * From what I have gathered, these devices are mass produced in China
   5 * by several vendors. They often share the same design as the original
   6 * Xbox 360 controller.
   7 *
   8 * 1a34:0802 "ACRUX USB GAMEPAD 8116"
   9 *  - tested with an EXEQ EQ-PCU-02090 game controller.
  10 *
  11 * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
  12 */
  13
  14/*
  15 * This program is free software; you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License as published by
  17 * the Free Software Foundation; either version 2 of the License, or
  18 * (at your option) any later version.
  19 *
  20 * This program is distributed in the hope that it will be useful,
  21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 * GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with this program; if not, write to the Free Software
  27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28 */
  29
  30#include <linux/input.h>
  31#include <linux/slab.h>
  32#include <linux/usb.h>
  33#include <linux/hid.h>
  34#include <linux/module.h>
  35
  36#include "hid-ids.h"
  37
  38#ifdef CONFIG_HID_ACRUX_FF
  39#include "usbhid/usbhid.h"
  40
  41struct axff_device {
  42        struct hid_report *report;
  43};
  44
  45static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  46{
  47        struct hid_device *hid = input_get_drvdata(dev);
  48        struct axff_device *axff = data;
  49        struct hid_report *report = axff->report;
  50        int field_count = 0;
  51        int left, right;
  52        int i, j;
  53
  54        left = effect->u.rumble.strong_magnitude;
  55        right = effect->u.rumble.weak_magnitude;
  56
  57        dbg_hid("called with 0x%04x 0x%04x", left, right);
  58
  59        left = left * 0xff / 0xffff;
  60        right = right * 0xff / 0xffff;
  61
  62        for (i = 0; i < report->maxfield; i++) {
  63                for (j = 0; j < report->field[i]->report_count; j++) {
  64                        report->field[i]->value[j] =
  65                                field_count % 2 ? right : left;
  66                        field_count++;
  67                }
  68        }
  69
  70        dbg_hid("running with 0x%02x 0x%02x", left, right);
  71        usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
  72
  73        return 0;
  74}
  75
  76static int axff_init(struct hid_device *hid)
  77{
  78        struct axff_device *axff;
  79        struct hid_report *report;
  80        struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
  81        struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
  82        struct input_dev *dev = hidinput->input;
  83        int field_count = 0;
  84        int i, j;
  85        int error;
  86
  87        if (list_empty(report_list)) {
  88                hid_err(hid, "no output reports found\n");
  89                return -ENODEV;
  90        }
  91
  92        report = list_first_entry(report_list, struct hid_report, list);
  93        for (i = 0; i < report->maxfield; i++) {
  94                for (j = 0; j < report->field[i]->report_count; j++) {
  95                        report->field[i]->value[j] = 0x00;
  96                        field_count++;
  97                }
  98        }
  99
 100        if (field_count < 4) {
 101                hid_err(hid, "not enough fields in the report: %d\n",
 102                        field_count);
 103                return -ENODEV;
 104        }
 105
 106        axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
 107        if (!axff)
 108                return -ENOMEM;
 109
 110        set_bit(FF_RUMBLE, dev->ffbit);
 111
 112        error = input_ff_create_memless(dev, axff, axff_play);
 113        if (error)
 114                goto err_free_mem;
 115
 116        axff->report = report;
 117        usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
 118
 119        hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
 120
 121        return 0;
 122
 123err_free_mem:
 124        kfree(axff);
 125        return error;
 126}
 127#else
 128static inline int axff_init(struct hid_device *hid)
 129{
 130        return 0;
 131}
 132#endif
 133
 134static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
 135{
 136        int error;
 137
 138        dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
 139
 140        error = hid_parse(hdev);
 141        if (error) {
 142                hid_err(hdev, "parse failed\n");
 143                return error;
 144        }
 145
 146        error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 147        if (error) {
 148                hid_err(hdev, "hw start failed\n");
 149                return error;
 150        }
 151
 152        error = axff_init(hdev);
 153        if (error) {
 154                /*
 155                 * Do not fail device initialization completely as device
 156                 * may still be partially operable, just warn.
 157                 */
 158                hid_warn(hdev,
 159                         "Failed to enable force feedback support, error: %d\n",
 160                         error);
 161        }
 162
 163        /*
 164         * We need to start polling device right away, otherwise
 165         * it will go into a coma.
 166         */
 167        error = hid_hw_open(hdev);
 168        if (error) {
 169                dev_err(&hdev->dev, "hw open failed\n");
 170                hid_hw_stop(hdev);
 171                return error;
 172        }
 173
 174        return 0;
 175}
 176
 177static void ax_remove(struct hid_device *hdev)
 178{
 179        hid_hw_close(hdev);
 180        hid_hw_stop(hdev);
 181}
 182
 183static const struct hid_device_id ax_devices[] = {
 184        { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
 185        { }
 186};
 187MODULE_DEVICE_TABLE(hid, ax_devices);
 188
 189static struct hid_driver ax_driver = {
 190        .name           = "acrux",
 191        .id_table       = ax_devices,
 192        .probe          = ax_probe,
 193        .remove         = ax_remove,
 194};
 195
 196static int __init ax_init(void)
 197{
 198        return hid_register_driver(&ax_driver);
 199}
 200
 201static void __exit ax_exit(void)
 202{
 203        hid_unregister_driver(&ax_driver);
 204}
 205
 206module_init(ax_init);
 207module_exit(ax_exit);
 208
 209MODULE_AUTHOR("Sergei Kolzun");
 210MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
 211MODULE_LICENSE("GPL");
 212
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