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 #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
  30 struct a4tech_sc {
  31         unsigned long quirks;
  32         unsigned int hw_wheel;
  33         __s32 delayed_value;
  34 };
  35
  36 static 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
  51 static 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
  89 static 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                 dev_err(&hdev->dev, "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                 dev_err(&hdev->dev, "parse failed\n");
 108                 goto err_free;
 109         }
 110
 111         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 112         if (ret) {
 113                 dev_err(&hdev->dev, "hw start failed\n");
 114                 goto err_free;
 115         }
 116
 117         return 0;
 118 err_free:
 119         kfree(a4);
 120         return ret;
 121 }
 122
 123 static 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
 131 static 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         { }
 137 };
 138 MODULE_DEVICE_TABLE(hid, a4_devices);
 139
 140 static struct hid_driver a4_driver = {
 141         .name = "a4tech",
 142         .id_table = a4_devices,
 143         .input_mapped = a4_input_mapped,
 144         .event = a4_event,
 145         .probe = a4_probe,
 146         .remove = a4_remove,
 147 };
 148
 149 static int __init a4_init(void)
 150 {
 151         return hid_register_driver(&a4_driver);
 152 }
 153
 154 static void __exit a4_exit(void)
 155 {
 156         hid_unregister_driver(&a4_driver);
 157 }
 158
 159 module_init(a4_init);
 160 module_exit(a4_exit);
 161 MODULE_LICENSE("GPL");