linux/drivers/hid/hid-lgff.c
<<
>>
Prefs
   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/usb.h>
  34#include <linux/hid.h>
  35
  36#include "usbhid/usbhid.h"
  37#include "hid-lg.h"
  38
  39struct dev_type {
  40        u16 idVendor;
  41        u16 idProduct;
  42        const signed short *ff;
  43};
  44
  45static const signed short ff_rumble[] = {
  46        FF_RUMBLE,
  47        -1
  48};
  49
  50static const signed short ff_joystick[] = {
  51        FF_CONSTANT,
  52        -1
  53};
  54
  55static const signed short ff_joystick_ac[] = {
  56        FF_CONSTANT,
  57        FF_AUTOCENTER,
  58        -1
  59};
  60
  61static const struct dev_type devices[] = {
  62        { 0x046d, 0xc211, ff_rumble },
  63        { 0x046d, 0xc219, ff_rumble },
  64        { 0x046d, 0xc283, ff_joystick },
  65        { 0x046d, 0xc286, ff_joystick_ac },
  66        { 0x046d, 0xc287, ff_joystick_ac },
  67        { 0x046d, 0xc293, ff_joystick },
  68        { 0x046d, 0xc295, ff_joystick },
  69};
  70
  71static int hid_lgff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
  72{
  73        struct hid_device *hid = input_get_drvdata(dev);
  74        struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
  75        struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
  76        int x, y;
  77        unsigned int left, right;
  78
  79#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff
  80
  81        switch (effect->type) {
  82        case FF_CONSTANT:
  83                x = effect->u.ramp.start_level + 0x7f;  /* 0x7f is center */
  84                y = effect->u.ramp.end_level + 0x7f;
  85                CLAMP(x);
  86                CLAMP(y);
  87                report->field[0]->value[0] = 0x51;
  88                report->field[0]->value[1] = 0x08;
  89                report->field[0]->value[2] = x;
  90                report->field[0]->value[3] = y;
  91                dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
  92                usbhid_submit_report(hid, report, USB_DIR_OUT);
  93                break;
  94
  95        case FF_RUMBLE:
  96                right = effect->u.rumble.strong_magnitude;
  97                left = effect->u.rumble.weak_magnitude;
  98                right = right * 0xff / 0xffff;
  99                left = left * 0xff / 0xffff;
 100                CLAMP(left);
 101                CLAMP(right);
 102                report->field[0]->value[0] = 0x42;
 103                report->field[0]->value[1] = 0x00;
 104                report->field[0]->value[2] = left;
 105                report->field[0]->value[3] = right;
 106                dbg_hid("(left, right)=(%04x, %04x)\n", left, right);
 107                usbhid_submit_report(hid, report, USB_DIR_OUT);
 108                break;
 109        }
 110        return 0;
 111}
 112
 113static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
 114{
 115        struct hid_device *hid = input_get_drvdata(dev);
 116        struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 117        struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 118        __s32 *value = report->field[0]->value;
 119        magnitude = (magnitude >> 12) & 0xf;
 120        *value++ = 0xfe;
 121        *value++ = 0x0d;
 122        *value++ = magnitude;   /* clockwise strength */
 123        *value++ = magnitude;   /* counter-clockwise strength */
 124        *value++ = 0x80;
 125        *value++ = 0x00;
 126        *value = 0x00;
 127        usbhid_submit_report(hid, report, USB_DIR_OUT);
 128}
 129
 130int lgff_init(struct hid_device* hid)
 131{
 132        struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 133        struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 134        struct input_dev *dev = hidinput->input;
 135        struct hid_report *report;
 136        struct hid_field *field;
 137        const signed short *ff_bits = ff_joystick;
 138        int error;
 139        int i;
 140
 141        /* Find the report to use */
 142        if (list_empty(report_list)) {
 143                hid_err(hid, "No output report found\n");
 144                return -1;
 145        }
 146
 147        /* Check that the report looks ok */
 148        report = list_entry(report_list->next, struct hid_report, list);
 149        field = report->field[0];
 150        if (!field) {
 151                hid_err(hid, "NULL field\n");
 152                return -1;
 153        }
 154
 155        for (i = 0; i < ARRAY_SIZE(devices); i++) {
 156                if (dev->id.vendor == devices[i].idVendor &&
 157                    dev->id.product == devices[i].idProduct) {
 158                        ff_bits = devices[i].ff;
 159                        break;
 160                }
 161        }
 162
 163        for (i = 0; ff_bits[i] >= 0; i++)
 164                set_bit(ff_bits[i], dev->ffbit);
 165
 166        error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 167        if (error)
 168                return error;
 169
 170        if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
 171                dev->ff->set_autocenter = hid_lgff_set_autocenter;
 172
 173        pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 174
 175        return 0;
 176}
 177
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.