linux/drivers/hid/hid-a4tech.c
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   1/*
   2 *  HID driver for some a4tech "special" devices
   3 *
   4 *  Copyright (c) 1999 Andreas Gal
   5 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7 *  Copyright (c) 2006-2007 Jiri Kosina
   8 *  Copyright (c) 2008 Jiri Slaby
   9 */
  10
  11/*
  12 * This program is free software; you can redistribute it and/or modify it
  13 * under the terms of the GNU General Public License as published by the Free
  14 * Software Foundation; either version 2 of the License, or (at your option)
  15 * any later version.
  16 */
  17
  18#include <linux/device.h>
  19#include <linux/input.h>
  20#include <linux/hid.h>
  21#include <linux/module.h>
  22#include <linux/slab.h>
  23
  24#include "hid-ids.h"
  25
  26#define A4_2WHEEL_MOUSE_HACK_7  0x01
  27#define A4_2WHEEL_MOUSE_HACK_B8 0x02
  28
  29struct a4tech_sc {
  30        unsigned long quirks;
  31        unsigned int hw_wheel;
  32        __s32 delayed_value;
  33};
  34
  35static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  36                struct hid_field *field, struct hid_usage *usage,
  37                unsigned long **bit, int *max)
  38{
  39        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  40
  41        if (usage->type == EV_REL && usage->code == REL_WHEEL)
  42                set_bit(REL_HWHEEL, *bit);
  43
  44        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  45                return -1;
  46
  47        return 0;
  48}
  49
  50static int a4_event(struct hid_device *hdev, struct hid_field *field,
  51                struct hid_usage *usage, __s32 value)
  52{
  53        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  54        struct input_dev *input;
  55
  56        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  57                        !usage->type)
  58                return 0;
  59
  60        input = field->hidinput->input;
  61
  62        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  63                if (usage->type == EV_REL && usage->code == REL_WHEEL) {
  64                        a4->delayed_value = value;
  65                        return 1;
  66                }
  67
  68                if (usage->hid == 0x000100b8) {
  69                        input_event(input, EV_REL, value ? REL_HWHEEL :
  70                                        REL_WHEEL, a4->delayed_value);
  71                        return 1;
  72                }
  73        }
  74
  75        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
  76                a4->hw_wheel = !!value;
  77                return 1;
  78        }
  79
  80        if (usage->code == REL_WHEEL && a4->hw_wheel) {
  81                input_event(input, usage->type, REL_HWHEEL, value);
  82                return 1;
  83        }
  84
  85        return 0;
  86}
  87
  88static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
  89{
  90        struct a4tech_sc *a4;
  91        int ret;
  92
  93        a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
  94        if (a4 == NULL) {
  95                hid_err(hdev, "can't alloc device descriptor\n");
  96                ret = -ENOMEM;
  97                goto err_free;
  98        }
  99
 100        a4->quirks = id->driver_data;
 101
 102        hid_set_drvdata(hdev, a4);
 103
 104        ret = hid_parse(hdev);
 105        if (ret) {
 106                hid_err(hdev, "parse failed\n");
 107                goto err_free;
 108        }
 109
 110        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 111        if (ret) {
 112                hid_err(hdev, "hw start failed\n");
 113                goto err_free;
 114        }
 115
 116        return 0;
 117err_free:
 118        kfree(a4);
 119        return ret;
 120}
 121
 122static void a4_remove(struct hid_device *hdev)
 123{
 124        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
 125
 126        hid_hw_stop(hdev);
 127        kfree(a4);
 128}
 129
 130static const struct hid_device_id a4_devices[] = {
 131        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 132                .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 133        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 134                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 135        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 136                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 137        { }
 138};
 139MODULE_DEVICE_TABLE(hid, a4_devices);
 140
 141static struct hid_driver a4_driver = {
 142        .name = "a4tech",
 143        .id_table = a4_devices,
 144        .input_mapped = a4_input_mapped,
 145        .event = a4_event,
 146        .probe = a4_probe,
 147        .remove = a4_remove,
 148};
 149
 150static int __init a4_init(void)
 151{
 152        return hid_register_driver(&a4_driver);
 153}
 154
 155static void __exit a4_exit(void)
 156{
 157        hid_unregister_driver(&a4_driver);
 158}
 159
 160module_init(a4_init);
 161module_exit(a4_exit);
 162MODULE_LICENSE("GPL");
 163
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