linux/drivers/hid/hid-saitek.c
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   1/*
   2 *  HID driver for Saitek devices.
   3 *
   4 *  PS1000 (USB gamepad):
   5 *  Fixes the HID report descriptor by removing a non-existent axis and
   6 *  clearing the constant bit on the input reports for buttons and d-pad.
   7 *  (This module is based on "hid-ortek".)
   8 *  Copyright (c) 2012 Andreas Hübner
   9 *
  10 *  R.A.T.7, R.A.T.9, M.M.O.7 (USB gaming mice):
  11 *  Fixes the mode button which cycles through three constantly pressed
  12 *  buttons. All three press events are mapped to one button and the
  13 *  missing release event is generated immediately.
  14 *
  15 */
  16
  17/*
  18 * This program is free software; you can redistribute it and/or modify it
  19 * under the terms of the GNU General Public License as published by the Free
  20 * Software Foundation; either version 2 of the License, or (at your option)
  21 * any later version.
  22 */
  23
  24#include <linux/device.h>
  25#include <linux/hid.h>
  26#include <linux/module.h>
  27#include <linux/kernel.h>
  28
  29#include "hid-ids.h"
  30
  31#define SAITEK_FIX_PS1000       0x0001
  32#define SAITEK_RELEASE_MODE_RAT7        0x0002
  33#define SAITEK_RELEASE_MODE_MMO7        0x0004
  34
  35struct saitek_sc {
  36        unsigned long quirks;
  37        int mode;
  38};
  39
  40static int saitek_probe(struct hid_device *hdev,
  41                const struct hid_device_id *id)
  42{
  43        unsigned long quirks = id->driver_data;
  44        struct saitek_sc *ssc;
  45        int ret;
  46
  47        ssc = devm_kzalloc(&hdev->dev, sizeof(*ssc), GFP_KERNEL);
  48        if (ssc == NULL) {
  49                hid_err(hdev, "can't alloc saitek descriptor\n");
  50                return -ENOMEM;
  51        }
  52
  53        ssc->quirks = quirks;
  54        ssc->mode = -1;
  55
  56        hid_set_drvdata(hdev, ssc);
  57
  58        ret = hid_parse(hdev);
  59        if (ret) {
  60                hid_err(hdev, "parse failed\n");
  61                return ret;
  62        }
  63
  64        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  65        if (ret) {
  66                hid_err(hdev, "hw start failed\n");
  67                return ret;
  68        }
  69
  70        return 0;
  71}
  72
  73static __u8 *saitek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  74                unsigned int *rsize)
  75{
  76        struct saitek_sc *ssc = hid_get_drvdata(hdev);
  77
  78        if ((ssc->quirks & SAITEK_FIX_PS1000) && *rsize == 137 &&
  79                        rdesc[20] == 0x09 && rdesc[21] == 0x33 &&
  80                        rdesc[94] == 0x81 && rdesc[95] == 0x03 &&
  81                        rdesc[110] == 0x81 && rdesc[111] == 0x03) {
  82
  83                hid_info(hdev, "Fixing up Saitek PS1000 report descriptor\n");
  84
  85                /* convert spurious axis to a "noop" Logical Minimum (0) */
  86                rdesc[20] = 0x15;
  87                rdesc[21] = 0x00;
  88
  89                /* clear constant bit on buttons and d-pad */
  90                rdesc[95] = 0x02;
  91                rdesc[111] = 0x02;
  92
  93        }
  94        return rdesc;
  95}
  96
  97static int saitek_raw_event(struct hid_device *hdev,
  98                struct hid_report *report, u8 *raw_data, int size)
  99{
 100        struct saitek_sc *ssc = hid_get_drvdata(hdev);
 101
 102        if (ssc->quirks & SAITEK_RELEASE_MODE_RAT7 && size == 7) {
 103                /* R.A.T.7 uses bits 13, 14, 15 for the mode */
 104                int mode = -1;
 105                if (raw_data[1] & 0x01)
 106                        mode = 0;
 107                else if (raw_data[1] & 0x02)
 108                        mode = 1;
 109                else if (raw_data[1] & 0x04)
 110                        mode = 2;
 111
 112                /* clear mode bits */
 113                raw_data[1] &= ~0x07;
 114
 115                if (mode != ssc->mode) {
 116                        hid_dbg(hdev, "entered mode %d\n", mode);
 117                        if (ssc->mode != -1) {
 118                                /* use bit 13 as the mode button */
 119                                raw_data[1] |= 0x04;
 120                        }
 121                        ssc->mode = mode;
 122                }
 123        } else if (ssc->quirks & SAITEK_RELEASE_MODE_MMO7 && size == 8) {
 124
 125                /* M.M.O.7 uses bits 8, 22, 23 for the mode */
 126                int mode = -1;
 127                if (raw_data[1] & 0x80)
 128                        mode = 0;
 129                else if (raw_data[2] & 0x01)
 130                        mode = 1;
 131                else if (raw_data[2] & 0x02)
 132                        mode = 2;
 133
 134                /* clear mode bits */
 135                raw_data[1] &= ~0x80;
 136                raw_data[2] &= ~0x03;
 137
 138                if (mode != ssc->mode) {
 139                        hid_dbg(hdev, "entered mode %d\n", mode);
 140                        if (ssc->mode != -1) {
 141                                /* use bit 8 as the mode button, bits 22
 142                                 * and 23 do not represent buttons
 143                                 * according to the HID report descriptor
 144                                 */
 145                                raw_data[1] |= 0x80;
 146                        }
 147                        ssc->mode = mode;
 148                }
 149        }
 150
 151        return 0;
 152}
 153
 154static int saitek_event(struct hid_device *hdev, struct hid_field *field,
 155                struct hid_usage *usage, __s32 value)
 156{
 157        struct saitek_sc *ssc = hid_get_drvdata(hdev);
 158        struct input_dev *input = field->hidinput->input;
 159
 160        if (usage->type == EV_KEY && value &&
 161                        (((ssc->quirks & SAITEK_RELEASE_MODE_RAT7) &&
 162                          usage->code - BTN_MOUSE == 10) ||
 163                        ((ssc->quirks & SAITEK_RELEASE_MODE_MMO7) &&
 164                         usage->code - BTN_MOUSE == 15))) {
 165
 166                input_report_key(input, usage->code, 1);
 167
 168                /* report missing release event */
 169                input_report_key(input, usage->code, 0);
 170
 171                return 1;
 172        }
 173
 174        return 0;
 175}
 176
 177static const struct hid_device_id saitek_devices[] = {
 178        { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_PS1000),
 179                .driver_data = SAITEK_FIX_PS1000 },
 180        { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_RAT7),
 181                .driver_data = SAITEK_RELEASE_MODE_RAT7 },
 182        { HID_USB_DEVICE(USB_VENDOR_ID_MADCATZ, USB_DEVICE_ID_MADCATZ_RAT9),
 183                .driver_data = SAITEK_RELEASE_MODE_RAT7 },
 184        { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_MMO7),
 185                .driver_data = SAITEK_RELEASE_MODE_MMO7 },
 186        { }
 187};
 188
 189MODULE_DEVICE_TABLE(hid, saitek_devices);
 190
 191static struct hid_driver saitek_driver = {
 192        .name = "saitek",
 193        .id_table = saitek_devices,
 194        .probe = saitek_probe,
 195        .report_fixup = saitek_report_fixup,
 196        .raw_event = saitek_raw_event,
 197        .event = saitek_event,
 198};
 199module_hid_driver(saitek_driver);
 200
 201MODULE_LICENSE("GPL");
 202
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