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
  38 struct gaff_device {
  39         struct hid_report *report;
  40 };
  41
  42 static 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
  76 static 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
 135 static inline int gaff_init(struct hid_device *hdev)
 136 {
 137         return 0;
 138 }
 139 #endif
 140
 141 static 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;
 162 err:
 163         return ret;
 164 }
 165
 166 static const struct hid_device_id ga_devices[] = {
 167         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 168         { }
 169 };
 170 MODULE_DEVICE_TABLE(hid, ga_devices);
 171
 172 static struct hid_driver ga_driver = {
 173         .name = "greenasia",
 174         .id_table = ga_devices,
 175         .probe = ga_probe,
 176 };
 177 module_hid_driver(ga_driver);
 178
 179 MODULE_LICENSE("GPL");