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) 2007 Paul Walmsley
   9 *  Copyright (c) 2008 Jiri Slaby
  10 */
  11
  12/*
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of the GNU General Public License as published by the Free
  15 * Software Foundation; either version 2 of the License, or (at your option)
  16 * any later version.
  17 */
  18
  19#include <linux/device.h>
  20#include <linux/input.h>
  21#include <linux/hid.h>
  22#include <linux/module.h>
  23#include <linux/slab.h>
  24
  25#include "hid-ids.h"
  26
  27#define A4_2WHEEL_MOUSE_HACK_7  0x01
  28#define A4_2WHEEL_MOUSE_HACK_B8 0x02
  29
  30struct a4tech_sc {
  31        unsigned long quirks;
  32        unsigned int hw_wheel;
  33        __s32 delayed_value;
  34};
  35
  36static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  37                struct hid_field *field, struct hid_usage *usage,
  38                unsigned long **bit, int *max)
  39{
  40        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  41
  42        if (usage->type == EV_REL && usage->code == REL_WHEEL)
  43                set_bit(REL_HWHEEL, *bit);
  44
  45        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  46                return -1;
  47
  48        return 0;
  49}
  50
  51static int a4_event(struct hid_device *hdev, struct hid_field *field,
  52                struct hid_usage *usage, __s32 value)
  53{
  54        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  55        struct input_dev *input;
  56
  57        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  58                        !usage->type)
  59                return 0;
  60
  61        input = field->hidinput->input;
  62
  63        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  64                if (usage->type == EV_REL && usage->code == REL_WHEEL) {
  65                        a4->delayed_value = value;
  66                        return 1;
  67                }
  68
  69                if (usage->hid == 0x000100b8) {
  70                        input_event(input, EV_REL, value ? REL_HWHEEL :
  71                                        REL_WHEEL, a4->delayed_value);
  72                        return 1;
  73                }
  74        }
  75
  76        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
  77                a4->hw_wheel = !!value;
  78                return 1;
  79        }
  80
  81        if (usage->code == REL_WHEEL && a4->hw_wheel) {
  82                input_event(input, usage->type, REL_HWHEEL, value);
  83                return 1;
  84        }
  85
  86        return 0;
  87}
  88
  89static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
  90{
  91        struct a4tech_sc *a4;
  92        int ret;
  93
  94        a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
  95        if (a4 == NULL) {
  96                hid_err(hdev, "can't alloc device descriptor\n");
  97                ret = -ENOMEM;
  98                goto err_free;
  99        }
 100
 101        a4->quirks = id->driver_data;
 102
 103        hid_set_drvdata(hdev, a4);
 104
 105        ret = hid_parse(hdev);
 106        if (ret) {
 107                hid_err(hdev, "parse failed\n");
 108                goto err_free;
 109        }
 110
 111        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 112        if (ret) {
 113                hid_err(hdev, "hw start failed\n");
 114                goto err_free;
 115        }
 116
 117        return 0;
 118err_free:
 119        kfree(a4);
 120        return ret;
 121}
 122
 123static void a4_remove(struct hid_device *hdev)
 124{
 125        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
 126
 127        hid_hw_stop(hdev);
 128        kfree(a4);
 129}
 130
 131static const struct hid_device_id a4_devices[] = {
 132        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 133                .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 134        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 135                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 136        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 137                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 138        { }
 139};
 140MODULE_DEVICE_TABLE(hid, a4_devices);
 141
 142static struct hid_driver a4_driver = {
 143        .name = "a4tech",
 144        .id_table = a4_devices,
 145        .input_mapped = a4_input_mapped,
 146        .event = a4_event,
 147        .probe = a4_probe,
 148        .remove = a4_remove,
 149};
 150
 151static int __init a4_init(void)
 152{
 153        return hid_register_driver(&a4_driver);
 154}
 155
 156static void __exit a4_exit(void)
 157{
 158        hid_unregister_driver(&a4_driver);
 159}
 160
 161module_init(a4_init);
 162module_exit(a4_exit);
 163MODULE_LICENSE("GPL");
 164
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