LXR linux/drivers/hid/hid-gaff.c

   1/*
   2 *  Force feedback support for GreenAsia (Product ID 0x12) based devices
   3 *
   4 *  The devices are distributed under various names and the same USB device ID
   5 *  can be used in many game controllers.
   6 *
   7 *
   8 *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
   9 *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
  10 *
  11 *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
  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#include "hid-ids.h"
  35
  36#ifdef CONFIG_GREENASIA_FF
  37
  38struct gaff_device {
  39        struct hid_report *report;
  40};
  41
  42static int hid_gaff_play(struct input_dev *dev, void *data,
  43                         struct ff_effect *effect)
  44{
  45        struct hid_device *hid = input_get_drvdata(dev);
  46        struct gaff_device *gaff = data;
  47        int left, right;
  48
  49        left = effect->u.rumble.strong_magnitude;
  50        right = effect->u.rumble.weak_magnitude;
  51
  52        dbg_hid("called with 0x%04x 0x%04x", left, right);
  53
  54        left = left * 0xfe / 0xffff;
  55        right = right * 0xfe / 0xffff;
  56
  57        gaff->report->field[0]->value[0] = 0x51;
  58        gaff->report->field[0]->value[1] = 0x0;
  59        gaff->report->field[0]->value[2] = right;
  60        gaff->report->field[0]->value[3] = 0;
  61        gaff->report->field[0]->value[4] = left;
  62        gaff->report->field[0]->value[5] = 0;
  63        dbg_hid("running with 0x%02x 0x%02x", left, right);
  64        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
  65
  66        gaff->report->field[0]->value[0] = 0xfa;
  67        gaff->report->field[0]->value[1] = 0xfe;
  68        gaff->report->field[0]->value[2] = 0x0;
  69        gaff->report->field[0]->value[4] = 0x0;
  70
  71        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
  72
  73        return 0;
  74}
  75
  76static int gaff_init(struct hid_device *hid)
  77{
  78        struct gaff_device *gaff;
  79        struct hid_report *report;
  80        struct hid_input *hidinput = list_entry(hid->inputs.next,
  81                                                struct hid_input, list);
  82        struct list_head *report_list =
  83                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  84        struct list_head *report_ptr = report_list;
  85        struct input_dev *dev = hidinput->input;
  86        int error;
  87
  88        if (list_empty(report_list)) {
  89                hid_err(hid, "no output reports found\n");
  90                return -ENODEV;
  91        }
  92
  93        report_ptr = report_ptr->next;
  94
  95        report = list_entry(report_ptr, struct hid_report, list);
  96        if (report->maxfield < 1) {
  97                hid_err(hid, "no fields in the report\n");
  98                return -ENODEV;
  99        }
 100
 101        if (report->field[0]->report_count < 6) {
 102                hid_err(hid, "not enough values in the field\n");
 103                return -ENODEV;
 104        }
 105
 106        gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
 107        if (!gaff)
 108                return -ENOMEM;
 109
 110        set_bit(FF_RUMBLE, dev->ffbit);
 111
 112        error = input_ff_create_memless(dev, gaff, hid_gaff_play);
 113        if (error) {
 114                kfree(gaff);
 115                return error;
 116        }
 117
 118        gaff->report = report;
 119        gaff->report->field[0]->value[0] = 0x51;
 120        gaff->report->field[0]->value[1] = 0x00;
 121        gaff->report->field[0]->value[2] = 0x00;
 122        gaff->report->field[0]->value[3] = 0x00;
 123        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 124
 125        gaff->report->field[0]->value[0] = 0xfa;
 126        gaff->report->field[0]->value[1] = 0xfe;
 127
 128        hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 129
 130        hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
 131
 132        return 0;
 133}
 134#else
 135static inline int gaff_init(struct hid_device *hdev)
 136{
 137        return 0;
 138}
 139#endif
 140
 141static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
 142{
 143        int ret;
 144
 145        dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
 146
 147        ret = hid_parse(hdev);
 148        if (ret) {
 149                hid_err(hdev, "parse failed\n");
 150                goto err;
 151        }
 152
 153        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 154        if (ret) {
 155                hid_err(hdev, "hw start failed\n");
 156                goto err;
 157        }
 158
 159        gaff_init(hdev);
 160
 161        return 0;
 162err:
 163        return ret;
 164}
 165
 166static const struct hid_device_id ga_devices[] = {
 167        { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 168        { }
 169};
 170MODULE_DEVICE_TABLE(hid, ga_devices);
 171
 172static struct hid_driver ga_driver = {
 173        .name = "greenasia",
 174        .id_table = ga_devices,
 175        .probe = ga_probe,
 176};
 177module_hid_driver(ga_driver);
 178
 179MODULE_LICENSE("GPL");
 180