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_HI_RES) {
  39                 set_bit(REL_HWHEEL, *bit);
  40                 set_bit(REL_HWHEEL_HI_RES, *bit);
  41         }
  42
  43         if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  44                 return -1;
  45
  46         return 0;
  47 }
  48
  49 static int a4_event(struct hid_device *hdev, struct hid_field *field,
  50                 struct hid_usage *usage, __s32 value)
  51 {
  52         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  53         struct input_dev *input;
  54
  55         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  56                         !usage->type)
  57                 return 0;
  58
  59         input = field->hidinput->input;
  60
  61         if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  62                 if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
  63                         a4->delayed_value = value;
  64                         return 1;
  65                 }
  66
  67                 if (usage->hid == 0x000100b8) {
  68                         input_event(input, EV_REL, value ? REL_HWHEEL :
  69                                         REL_WHEEL, a4->delayed_value);
  70                         input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
  71                                         REL_WHEEL_HI_RES, a4->delayed_value * 120);
  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_HI_RES && a4->hw_wheel) {
  82                 input_event(input, usage->type, REL_HWHEEL, value);
  83                 input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
  84                 return 1;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
  91 {
  92         struct a4tech_sc *a4;
  93         int ret;
  94
  95         a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
  96         if (a4 == NULL) {
  97                 hid_err(hdev, "can't alloc device descriptor\n");
  98                 return -ENOMEM;
  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                 return ret;
 109         }
 110
 111         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 112         if (ret) {
 113                 hid_err(hdev, "hw start failed\n");
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static const struct hid_device_id a4_devices[] = {
 121         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 122                 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 123         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 124                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 125         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 126                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 127         { }
 128 };
 129 MODULE_DEVICE_TABLE(hid, a4_devices);
 130
 131 static struct hid_driver a4_driver = {
 132         .name = "a4tech",
 133         .id_table = a4_devices,
 134         .input_mapped = a4_input_mapped,
 135         .event = a4_event,
 136         .probe = a4_probe,
 137 };
 138 module_hid_driver(a4_driver);
 139
 140 MODULE_LICENSE("GPL");