drivers/hid/hid-a4tech.c

   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
  24 #include "hid-ids.h"
  25
  26 #define A4_2WHEEL_MOUSE_HACK_7  0x01
  27 #define A4_2WHEEL_MOUSE_HACK_B8 0x02
  28
  29 struct a4tech_sc {
  30         unsigned long quirks;
  31         unsigned int hw_wheel;
  32         __s32 delayed_value;
  33 };
  34
  35 static 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
  50 static 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
  88 static 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                 dev_err(&hdev->dev, "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                 dev_err(&hdev->dev, "parse failed\n");
 107                 goto err_free;
 108         }
 109
 110         ret = hid_hw_start(hdev);
 111         if (ret) {
 112                 dev_err(&hdev->dev, "hw start failed\n");
 113                 goto err_free;
 114         }
 115
 116         return 0;
 117 err_free:
 118         kfree(a4);
 119         return ret;
 120 }
 121
 122 static 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
 130 static 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         { }
 136 };
 137 MODULE_DEVICE_TABLE(hid, a4_devices);
 138
 139 static struct hid_driver a4_driver = {
 140         .name = "a4tech",
 141         .id_table = a4_devices,
 142         .input_mapped = a4_input_mapped,
 143         .event = a4_event,
 144         .probe = a4_probe,
 145         .remove = a4_remove,
 146 };
 147
 148 static int a4_init(void)
 149 {
 150         return hid_register_driver(&a4_driver);
 151 }
 152
 153 static void a4_exit(void)
 154 {
 155         hid_unregister_driver(&a4_driver);
 156 }
 157
 158 module_init(a4_init);
 159 module_exit(a4_exit);
 160 MODULE_LICENSE("GPL");
 161
 162 HID_COMPAT_LOAD_DRIVER(a4tech);