drivers/hid/hid-axff.c

   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
  39 struct axff_device {
  40         struct hid_report *report;
  41 };
  42
  43 static 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
  74 static 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
 121 err_free_mem:
 122         kfree(axff);
 123         return error;
 124 }
 125 #else
 126 static inline int axff_init(struct hid_device *hid)
 127 {
 128         return 0;
 129 }
 130 #endif
 131
 132 static 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
 175 static void ax_remove(struct hid_device *hdev)
 176 {
 177         hid_hw_close(hdev);
 178         hid_hw_stop(hdev);
 179 }
 180
 181 static const struct hid_device_id ax_devices[] = {
 182         { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
 183         { }
 184 };
 185 MODULE_DEVICE_TABLE(hid, ax_devices);
 186
 187 static struct hid_driver ax_driver = {
 188         .name           = "acrux",
 189         .id_table       = ax_devices,
 190         .probe          = ax_probe,
 191         .remove         = ax_remove,
 192 };
 193 module_hid_driver(ax_driver);
 194
 195 MODULE_AUTHOR("Sergei Kolzun");
 196 MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
 197 MODULE_LICENSE("GPL");