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 struct a4tech_sc {
  27         unsigned long quirks;
  28         unsigned int hw_wheel;
  29         __s32 delayed_value;
  30 };
  31
  32 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  33                 struct hid_field *field, struct hid_usage *usage,
  34                 unsigned long **bit, int *max)
  35 {
  36         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  37
  38         if (usage->type == EV_REL && usage->code == REL_WHEEL)
  39                 set_bit(REL_HWHEEL, *bit);
  40
  41         if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  42                 return -1;
  43
  44         return 0;
  45 }
  46
  47 static int a4_event(struct hid_device *hdev, struct hid_field *field,
  48                 struct hid_usage *usage, __s32 value)
  49 {
  50         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  51         struct input_dev *input;
  52
  53         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  54                         !usage->type)
  55                 return 0;
  56
  57         input = field->hidinput->input;
  58
  59         if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  60                 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
  61                         a4->delayed_value = value;
  62                         return 1;
  63                 }
  64
  65                 if (usage->hid == 0x000100b8) {
  66                         input_event(input, EV_REL, value ? REL_HWHEEL :
  67                                         REL_WHEEL, a4->delayed_value);
  68                         return 1;
  69                 }
  70         }
  71
  72         if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
  73                 a4->hw_wheel = !!value;
  74                 return 1;
  75         }
  76
  77         if (usage->code == REL_WHEEL && a4->hw_wheel) {
  78                 input_event(input, usage->type, REL_HWHEEL, value);
  79                 return 1;
  80         }
  81
  82         return 0;
  83 }
  84
  85 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
  86 {
  87         struct a4tech_sc *a4;
  88         int ret;
  89
  90         a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
  91         if (a4 == NULL) {
  92                 hid_err(hdev, "can't alloc device descriptor\n");
  93                 return -ENOMEM;
  94         }
  95
  96         a4->quirks = id->driver_data;
  97
  98         hid_set_drvdata(hdev, a4);
  99
 100         ret = hid_parse(hdev);
 101         if (ret) {
 102                 hid_err(hdev, "parse failed\n");
 103                 return ret;
 104         }
 105
 106         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 107         if (ret) {
 108                 hid_err(hdev, "hw start failed\n");
 109                 return ret;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static const struct hid_device_id a4_devices[] = {
 116         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 117                 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 118         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 119                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 120         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 121                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 122         { }
 123 };
 124 MODULE_DEVICE_TABLE(hid, a4_devices);
 125
 126 static struct hid_driver a4_driver = {
 127         .name = "a4tech",
 128         .id_table = a4_devices,
 129         .input_mapped = a4_input_mapped,
 130         .event = a4_event,
 131         .probe = a4_probe,
 132 };
 133 module_hid_driver(a4_driver);
 134
 135 MODULE_LICENSE("GPL");