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
  35 #ifdef CONFIG_GREENASIA_FF
  36 #include "usbhid/usbhid.h"
  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         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
  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         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
  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                 dev_err(&hid->dev, "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                 dev_err(&hid->dev, "no fields in the report\n");
  98                 return -ENODEV;
  99         }
 100
 101         if (report->field[0]->report_count < 6) {
 102                 dev_err(&hid->dev, "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         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
 124
 125         gaff->report->field[0]->value[0] = 0xfa;
 126         gaff->report->field[0]->value[1] = 0xfe;
 127
 128         usbhid_submit_report(hid, gaff->report, USB_DIR_OUT);
 129
 130         dev_info(&hid->dev, "Force Feedback for GreenAsia 0x12"
 131                " devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
 132
 133         return 0;
 134 }
 135 #else
 136 static inline int gaff_init(struct hid_device *hdev)
 137 {
 138         return 0;
 139 }
 140 #endif
 141
 142 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
 143 {
 144         int ret;
 145
 146         dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
 147
 148         ret = hid_parse(hdev);
 149         if (ret) {
 150                 dev_err(&hdev->dev, "parse failed\n");
 151                 goto err;
 152         }
 153
 154         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 155         if (ret) {
 156                 dev_err(&hdev->dev, "hw start failed\n");
 157                 goto err;
 158         }
 159
 160         gaff_init(hdev);
 161
 162         return 0;
 163 err:
 164         return ret;
 165 }
 166
 167 static const struct hid_device_id ga_devices[] = {
 168         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 169         { }
 170 };
 171 MODULE_DEVICE_TABLE(hid, ga_devices);
 172
 173 static struct hid_driver ga_driver = {
 174         .name = "greenasia",
 175         .id_table = ga_devices,
 176         .probe = ga_probe,
 177 };
 178
 179 static int __init ga_init(void)
 180 {
 181         return hid_register_driver(&ga_driver);
 182 }
 183
 184 static void __exit ga_exit(void)
 185 {
 186         hid_unregister_driver(&ga_driver);
 187 }
 188
 189 module_init(ga_init);
 190 module_exit(ga_exit);
 191 MODULE_LICENSE("GPL");