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/hid.h>
  33#include <linux/module.h>
  34
  35#include "hid-ids.h"
  36
  37#ifdef CONFIG_HID_ACRUX_FF
  38
  39struct axff_device {
  40        struct hid_report *report;
  41};
  42
  43static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  44{
  45        struct hid_device *hid = input_get_drvdata(dev);
  46        struct axff_device *axff = data;
  47        struct hid_report *report = axff->report;
  48        int field_count = 0;
  49        int left, right;
  50        int i, j;
  51
  52        left = effect->u.rumble.strong_magnitude;
  53        right = effect->u.rumble.weak_magnitude;
  54
  55        dbg_hid("called with 0x%04x 0x%04x", left, right);
  56
  57        left = left * 0xff / 0xffff;
  58        right = right * 0xff / 0xffff;
  59
  60        for (i = 0; i < report->maxfield; i++) {
  61                for (j = 0; j < report->field[i]->report_count; j++) {
  62                        report->field[i]->value[j] =
  63                                field_count % 2 ? right : left;
  64                        field_count++;
  65                }
  66        }
  67
  68        dbg_hid("running with 0x%02x 0x%02x", left, right);
  69        hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
  70
  71        return 0;
  72}
  73
  74static int axff_init(struct hid_device *hid)
  75{
  76        struct axff_device *axff;
  77        struct hid_report *report;
  78        struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
  79        struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
  80        struct input_dev *dev = hidinput->input;
  81        int field_count = 0;
  82        int i, j;
  83        int error;
  84
  85        if (list_empty(report_list)) {
  86                hid_err(hid, "no output reports found\n");
  87                return -ENODEV;
  88        }
  89
  90        report = list_first_entry(report_list, struct hid_report, list);
  91        for (i = 0; i < report->maxfield; i++) {
  92                for (j = 0; j < report->field[i]->report_count; j++) {
  93                        report->field[i]->value[j] = 0x00;
  94                        field_count++;
  95                }
  96        }
  97
  98        if (field_count < 4) {
  99                hid_err(hid, "not enough fields in the report: %d\n",
 100                        field_count);
 101                return -ENODEV;
 102        }
 103
 104        axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
 105        if (!axff)
 106                return -ENOMEM;
 107
 108        set_bit(FF_RUMBLE, dev->ffbit);
 109
 110        error = input_ff_create_memless(dev, axff, axff_play);
 111        if (error)
 112                goto err_free_mem;
 113
 114        axff->report = report;
 115        hid_hw_request(hid, axff->report, HID_REQ_SET_REPORT);
 116
 117        hid_info(hid, "Force Feedback for ACRUX game controllers by Sergei Kolzun <x0r@dv-life.ru>\n");
 118
 119        return 0;
 120
 121err_free_mem:
 122        kfree(axff);
 123        return error;
 124}
 125#else
 126static inline int axff_init(struct hid_device *hid)
 127{
 128        return 0;
 129}
 130#endif
 131
 132static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
 133{
 134        int error;
 135
 136        dev_dbg(&hdev->dev, "ACRUX HID hardware probe...\n");
 137
 138        error = hid_parse(hdev);
 139        if (error) {
 140                hid_err(hdev, "parse failed\n");
 141                return error;
 142        }
 143
 144        error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 145        if (error) {
 146                hid_err(hdev, "hw start failed\n");
 147                return error;
 148        }
 149
 150        error = axff_init(hdev);
 151        if (error) {
 152                /*
 153                 * Do not fail device initialization completely as device
 154                 * may still be partially operable, just warn.
 155                 */
 156                hid_warn(hdev,
 157                         "Failed to enable force feedback support, error: %d\n",
 158                         error);
 159        }
 160
 161        /*
 162         * We need to start polling device right away, otherwise
 163         * it will go into a coma.
 164         */
 165        error = hid_hw_open(hdev);
 166        if (error) {
 167                dev_err(&hdev->dev, "hw open failed\n");
 168                hid_hw_stop(hdev);
 169                return error;
 170        }
 171
 172        return 0;
 173}
 174
 175static void ax_remove(struct hid_device *hdev)
 176{
 177        hid_hw_close(hdev);
 178        hid_hw_stop(hdev);
 179}
 180
 181static const struct hid_device_id ax_devices[] = {
 182        { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
 183        { }
 184};
 185MODULE_DEVICE_TABLE(hid, ax_devices);
 186
 187static struct hid_driver ax_driver = {
 188        .name           = "acrux",
 189        .id_table       = ax_devices,
 190        .probe          = ax_probe,
 191        .remove         = ax_remove,
 192};
 193module_hid_driver(ax_driver);
 194
 195MODULE_AUTHOR("Sergei Kolzun");
 196MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
 197MODULE_LICENSE("GPL");
 198
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