drivers/hid/usbhid/hid-plff.c

   1 /*
   2  *  Force feedback support for PantherLord USB/PS2 2in1 Adapter devices
   3  *
   4  *  Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23
  24 /* #define DEBUG */
  25
  26 #define debug(format, arg...) pr_debug("hid-plff: " format "\n" , ## arg)
  27
  28 #include <linux/input.h>
  29 #include <linux/usb.h>
  30 #include <linux/hid.h>
  31 #include "usbhid.h"
  32
  33 struct plff_device {
  34         struct hid_report *report;
  35 };
  36
  37 static int hid_plff_play(struct input_dev *dev, void *data,
  38                          struct ff_effect *effect)
  39 {
  40         struct hid_device *hid = dev->private;
  41         struct plff_device *plff = data;
  42         int left, right;
  43
  44         left = effect->u.rumble.strong_magnitude;
  45         right = effect->u.rumble.weak_magnitude;
  46         debug("called with 0x%04x 0x%04x", left, right);
  47
  48         left = left * 0x7f / 0xffff;
  49         right = right * 0x7f / 0xffff;
  50
  51         plff->report->field[0]->value[2] = left;
  52         plff->report->field[0]->value[3] = right;
  53         debug("running with 0x%02x 0x%02x", left, right);
  54         usbhid_submit_report(hid, plff->report, USB_DIR_OUT);
  55
  56         return 0;
  57 }
  58
  59 int hid_plff_init(struct hid_device *hid)
  60 {
  61         struct plff_device *plff;
  62         struct hid_report *report;
  63         struct hid_input *hidinput;
  64         struct list_head *report_list =
  65                         &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  66         struct list_head *report_ptr = report_list;
  67         struct input_dev *dev;
  68         int error;
  69
  70         /* The device contains 2 output reports (one for each
  71            HID_QUIRK_MULTI_INPUT device), both containing 1 field, which
  72            contains 4 ff00.0002 usages and 4 16bit absolute values.
  73
  74            The 2 input reports also contain a field which contains
  75            8 ff00.0001 usages and 8 boolean values. Their meaning is
  76            currently unknown. */
  77
  78         if (list_empty(report_list)) {
  79                 printk(KERN_ERR "hid-plff: no output reports found\n");
  80                 return -ENODEV;
  81         }
  82
  83         list_for_each_entry(hidinput, &hid->inputs, list) {
  84
  85                 report_ptr = report_ptr->next;
  86
  87                 if (report_ptr == report_list) {
  88                         printk(KERN_ERR "hid-plff: required output report is missing\n");
  89                         return -ENODEV;
  90                 }
  91
  92                 report = list_entry(report_ptr, struct hid_report, list);
  93                 if (report->maxfield < 1) {
  94                         printk(KERN_ERR "hid-plff: no fields in the report\n");
  95                         return -ENODEV;
  96                 }
  97
  98                 if (report->field[0]->report_count < 4) {
  99                         printk(KERN_ERR "hid-plff: not enough values in the field\n");
 100                         return -ENODEV;
 101                 }
 102
 103                 plff = kzalloc(sizeof(struct plff_device), GFP_KERNEL);
 104                 if (!plff)
 105                         return -ENOMEM;
 106
 107                 dev = hidinput->input;
 108
 109                 set_bit(FF_RUMBLE, dev->ffbit);
 110
 111                 error = input_ff_create_memless(dev, plff, hid_plff_play);
 112                 if (error) {
 113                         kfree(plff);
 114                         return error;
 115                 }
 116
 117                 plff->report = report;
 118                 plff->report->field[0]->value[0] = 0x00;
 119                 plff->report->field[0]->value[1] = 0x00;
 120                 plff->report->field[0]->value[2] = 0x00;
 121                 plff->report->field[0]->value[3] = 0x00;
 122                 usbhid_submit_report(hid, plff->report, USB_DIR_OUT);
 123         }
 124
 125         printk(KERN_INFO "hid-plff: Force feedback for PantherLord USB/PS2 "
 126                "2in1 Adapters by Anssi Hannula <anssi.hannula@gmail.com>\n");
 127
 128         return 0;
 129 }