linux/drivers/hid/hid-lgff.c
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   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
  37struct dev_type {
  38        u16 idVendor;
  39        u16 idProduct;
  40        const signed short *ff;
  41};
  42
  43static const signed short ff_rumble[] = {
  44        FF_RUMBLE,
  45        -1
  46};
  47
  48static const signed short ff_joystick[] = {
  49        FF_CONSTANT,
  50        -1
  51};
  52
  53static const signed short ff_joystick_ac[] = {
  54        FF_CONSTANT,
  55        FF_AUTOCENTER,
  56        -1
  57};
  58
  59static 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
  69static 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
 111static 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
 128int lgff_init(struct hid_device* hid)
 129{
 130        struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 131        struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 132        struct input_dev *dev = hidinput->input;
 133        struct hid_report *report;
 134        struct hid_field *field;
 135        const signed short *ff_bits = ff_joystick;
 136        int error;
 137        int i;
 138
 139        /* Find the report to use */
 140        if (list_empty(report_list)) {
 141                hid_err(hid, "No output report found\n");
 142                return -1;
 143        }
 144
 145        /* Check that the report looks ok */
 146        report = list_entry(report_list->next, struct hid_report, list);
 147        field = report->field[0];
 148        if (!field) {
 149                hid_err(hid, "NULL field\n");
 150                return -1;
 151        }
 152
 153        for (i = 0; i < ARRAY_SIZE(devices); i++) {
 154                if (dev->id.vendor == devices[i].idVendor &&
 155                    dev->id.product == devices[i].idProduct) {
 156                        ff_bits = devices[i].ff;
 157                        break;
 158                }
 159        }
 160
 161        for (i = 0; ff_bits[i] >= 0; i++)
 162                set_bit(ff_bits[i], dev->ffbit);
 163
 164        error = input_ff_create_memless(dev, NULL, hid_lgff_play);
 165        if (error)
 166                return error;
 167
 168        if ( test_bit(FF_AUTOCENTER, dev->ffbit) )
 169                dev->ff->set_autocenter = hid_lgff_set_autocenter;
 170
 171        pr_info("Force feedback for Logitech force feedback devices by Johann Deneux <johann.deneux@it.uu.se>\n");
 172
 173        return 0;
 174}
 175
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