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