drivers/hid/hid-lgff.c

   1 /*
   2  * Force feedback support for hid-compliant for some of the devices from
   3  * Logitech, namely:
   4  * - WingMan Cordless RumblePad
   5  * - WingMan Force 3D
   6  *
   7  *  Copyright (c) 2002-2004 Johann Deneux
   8  *  Copyright (c) 2006 Anssi Hannula <anssi.hannula@gmail.com>
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so by
  27  * e-mail - mail your message to <johann.deneux@it.uu.se>
  28  */
  29
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/input.h>
  33 #include <linux/hid.h>
  34
  35 #include "hid-lg.h"
  36
  37 struct dev_type {
  38         u16 idVendor;
  39         u16 idProduct;
  40         const signed short *ff;
  41 };
  42
  43 static const signed short ff_rumble[] = {
  44         FF_RUMBLE,
  45         -1
  46 };
  47
  48 static const signed short ff_joystick[] = {
  49         FF_CONSTANT,
  50         -1
  51 };
  52
  53 static const signed short ff_joystick_ac[] = {
  54         FF_CONSTANT,
  55         FF_AUTOCENTER,
  56         -1
  57 };
  58
  59 static const struct dev_type devices[] = {
  60         { 0x046d, 0xc211, ff_rumble },
  61         { 0x046d, 0xc219, ff_rumble },
  62         { 0x046d, 0xc283, ff_joystick },
  63         { 0x046d, 0xc286, ff_joystick_ac },
  64         { 0x046d, 0xc287, ff_joystick_ac },
  65         { 0x046d, 0xc293, ff_joystick },
  66         { 0x046d, 0xc295, ff_joystick },
  67 };
  68
  69 static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  70 {
  71         struct hid_device *hid = input_get_drvdata(dev);
  72         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  73         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
  74         int x, y;
  75         unsigned int left, right;
  76
  77 #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
  78
  79         switch (effect->type) {
  80         case FF_CONSTANT:
  81                 x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
  82                 y = effect->u.ramp.end_level + 0x7f;
  83                 CLAMP(x);
  84                 CLAMP(y);
  85                 report->field[0]->value[0] = 0x51;
  86                 report->field[0]->value[1] = 0x08;
  87                 report->field[0]->value[2] = x;
  88                 report->field[0]->value[3] = y;
  89                 dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
  90                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
  91                 break;
  92
  93         case FF_RUMBLE:
  94                 right = effect->u.rumble.strong_magnitude;
  95                 left = effect->u.rumble.weak_magnitude;
  96                 right = right * 0xff / 0xffff;
  97                 left = left * 0xff / 0xffff;
  98                 CLAMP(left);
  99                 CLAMP(right);
 100                 report->field[0]->value[0] = 0x42;
 101                 report->field[0]->value[1] = 0x00;
 102                 report->field[0]->value[2] = left;
 103                 report->field[0]->value[3] = right;
 104                 dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
 105                 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 106                 break;
 107         }
 108         return 0;
 109 }
 110
 111 static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
 112 {
 113         struct hid_device *hid = input_get_drvdata(dev);
 114         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 115         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 116         __s32 *value = report->field[0]->value;
 117         magnitude = (magnitude >> 12) & 0xf;
 118         *value++ = 0xfe;
 119         *value++ = 0x0d;
 120         *value++ = magnitude;   /* clockwise strength */
 121         *value++ = magnitude;   /* counter-clockwise strength */
 122         *value++ = 0x80;
 123         *value++ = 0x00;
 124         *value = 0x00;
 125         hid_hw_request(hid, report, HID_REQ_SET_REPORT);
 126 }
 127
 128 int lgff_init(struct hid_device* hid)
 129 {
 130         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 131         struct input_dev *dev = hidinput->input;
 132         const signed short *ff_bits = ff_joystick;
 133         int error;
 134         int i;
 135
 136         /* Check that the report looks ok */
 137         if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
 138                 return -ENODEV;
 139
 140         for (i = 0; i < ARRAY_SIZE(devices); i++) {
 141                 if (dev->id.vendor == devices[i].idVendor &&
 142                     dev->id.product == devices[i].idProduct) {
 143                         ff_bits = devices[i].ff;
 144                         break;
 145                 }
 146         }
 147
 148         for (i = 0; ff_bits[i] >= 0; i++)
 149                 set_bit(ff_bits[i], dev->ffbit);
 150
 151         error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 152         if (error)
 153                 return error;
 154
 155         if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
 156                 dev->ff->set_autocenter = hid_lgff_set_autocenter;
 157
 158         pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 159
 160         return 0;
 161 }