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;
  81         struct list_head *report_list =
  82                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  83         struct list_head *report_ptr = report_list;
  84         struct input_dev *dev;
  85         int error;
  86
  87         if (list_empty(&hid->inputs)) {
  88                 hid_err(hid, "no inputs found\n");
  89                 return -ENODEV;
  90         }
  91         hidinput = list_entry(hid->inputs.next, struct hid_input, list);
  92         dev = hidinput->input;
  93
  94         if (list_empty(report_list)) {
  95                 hid_err(hid, "no output reports found\n");
  96                 return -ENODEV;
  97         }
  98
  99         report_ptr = report_ptr->next;
 100
 101         report = list_entry(report_ptr, struct hid_report, list);
 102         if (report->maxfield < 1) {
 103                 hid_err(hid, "no fields in the report\n");
 104                 return -ENODEV;
 105         }
 106
 107         if (report->field[0]->report_count < 6) {
 108                 hid_err(hid, "not enough values in the field\n");
 109                 return -ENODEV;
 110         }
 111
 112         gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
 113         if (!gaff)
 114                 return -ENOMEM;
 115
 116         set_bit(FF_RUMBLE, dev->ffbit);
 117
 118         error = input_ff_create_memless(dev, gaff, hid_gaff_play);
 119         if (error) {
 120                 kfree(gaff);
 121                 return error;
 122         }
 123
 124         gaff->report = report;
 125         gaff->report->field[0]->value[0] = 0x51;
 126         gaff->report->field[0]->value[1] = 0x00;
 127         gaff->report->field[0]->value[2] = 0x00;
 128         gaff->report->field[0]->value[3] = 0x00;
 129         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 130
 131         gaff->report->field[0]->value[0] = 0xfa;
 132         gaff->report->field[0]->value[1] = 0xfe;
 133
 134         hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
 135
 136         hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
 137
 138         return 0;
 139 }
 140 #else
 141 static inline int gaff_init(struct hid_device *hdev)
 142 {
 143         return 0;
 144 }
 145 #endif
 146
 147 static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
 148 {
 149         int ret;
 150
 151         dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
 152
 153         ret = hid_parse(hdev);
 154         if (ret) {
 155                 hid_err(hdev, "parse failed\n");
 156                 goto err;
 157         }
 158
 159         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 160         if (ret) {
 161                 hid_err(hdev, "hw start failed\n");
 162                 goto err;
 163         }
 164
 165         gaff_init(hdev);
 166
 167         return 0;
 168 err:
 169         return ret;
 170 }
 171
 172 static const struct hid_device_id ga_devices[] = {
 173         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
 174         { }
 175 };
 176 MODULE_DEVICE_TABLE(hid, ga_devices);
 177
 178 static struct hid_driver ga_driver = {
 179         .name = "greenasia",
 180         .id_table = ga_devices,
 181         .probe = ga_probe,
 182 };
 183 module_hid_driver(ga_driver);
 184
 185 MODULE_LICENSE("GPL");