LXR linux/drivers/hid/hid-a4tech.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  HID driver for some a4tech "special" devices
   4 *
   5 *  Copyright (c) 1999 Andreas Gal
   6 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8 *  Copyright (c) 2006-2007 Jiri Kosina
   9 *  Copyright (c) 2008 Jiri Slaby
  10 */
  11
  12/*
  13 */
  14
  15#include <linux/device.h>
  16#include <linux/input.h>
  17#include <linux/hid.h>
  18#include <linux/module.h>
  19#include <linux/slab.h>
  20
  21#include "hid-ids.h"
  22
  23#define A4_2WHEEL_MOUSE_HACK_7  0x01
  24#define A4_2WHEEL_MOUSE_HACK_B8 0x02
  25
  26#define A4_WHEEL_ORIENTATION    (HID_UP_GENDESK | 0x000000b8)
  27
  28struct a4tech_sc {
  29        unsigned long quirks;
  30        unsigned int hw_wheel;
  31        __s32 delayed_value;
  32};
  33
  34static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  35                            struct hid_field *field, struct hid_usage *usage,
  36                            unsigned long **bit, int *max)
  37{
  38        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  39
  40        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
  41            usage->hid == A4_WHEEL_ORIENTATION) {
  42                /*
  43                 * We do not want to have this usage mapped to anything as it's
  44                 * nonstandard and doesn't really behave like an HID report.
  45                 * It's only selecting the orientation (vertical/horizontal) of
  46                 * the previous mouse wheel report. The input_events will be
  47                 * generated once both reports are recorded in a4_event().
  48                 */
  49                return -1;
  50        }
  51
  52        return 0;
  53
  54}
  55
  56static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  57                struct hid_field *field, struct hid_usage *usage,
  58                unsigned long **bit, int *max)
  59{
  60        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  61
  62        if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
  63                set_bit(REL_HWHEEL, *bit);
  64                set_bit(REL_HWHEEL_HI_RES, *bit);
  65        }
  66
  67        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  68                return -1;
  69
  70        return 0;
  71}
  72
  73static int a4_event(struct hid_device *hdev, struct hid_field *field,
  74                struct hid_usage *usage, __s32 value)
  75{
  76        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  77        struct input_dev *input;
  78
  79        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  80                return 0;
  81
  82        input = field->hidinput->input;
  83
  84        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  85                if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
  86                        a4->delayed_value = value;
  87                        return 1;
  88                }
  89
  90                if (usage->hid == A4_WHEEL_ORIENTATION) {
  91                        input_event(input, EV_REL, value ? REL_HWHEEL :
  92                                        REL_WHEEL, a4->delayed_value);
  93                        input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
  94                                        REL_WHEEL_HI_RES, a4->delayed_value * 120);
  95                        return 1;
  96                }
  97        }
  98
  99        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
 100                a4->hw_wheel = !!value;
 101                return 1;
 102        }
 103
 104        if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
 105                input_event(input, usage->type, REL_HWHEEL, value);
 106                input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
 107                return 1;
 108        }
 109
 110        return 0;
 111}
 112
 113static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
 114{
 115        struct a4tech_sc *a4;
 116        int ret;
 117
 118        a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
 119        if (a4 == NULL) {
 120                hid_err(hdev, "can't alloc device descriptor\n");
 121                return -ENOMEM;
 122        }
 123
 124        a4->quirks = id->driver_data;
 125
 126        hid_set_drvdata(hdev, a4);
 127
 128        ret = hid_parse(hdev);
 129        if (ret) {
 130                hid_err(hdev, "parse failed\n");
 131                return ret;
 132        }
 133
 134        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 135        if (ret) {
 136                hid_err(hdev, "hw start failed\n");
 137                return ret;
 138        }
 139
 140        return 0;
 141}
 142
 143static const struct hid_device_id a4_devices[] = {
 144        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 145                .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 146        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 147                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 148        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 149                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 150        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95),
 151                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 152        { }
 153};
 154MODULE_DEVICE_TABLE(hid, a4_devices);
 155
 156static struct hid_driver a4_driver = {
 157        .name = "a4tech",
 158        .id_table = a4_devices,
 159        .input_mapping = a4_input_mapping,
 160        .input_mapped = a4_input_mapped,
 161        .event = a4_event,
 162        .probe = a4_probe,
 163};
 164module_hid_driver(a4_driver);
 165
 166MODULE_LICENSE("GPL");
 167