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) 2008 Jiri Slaby
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/input.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.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 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
  94         if (a4 == NULL) {
  95                 hid_err(hdev, "can't alloc device descriptor\n");
  96                 return -ENOMEM;
  97         }
  98
  99         a4->quirks = id->driver_data;
 100
 101         hid_set_drvdata(hdev, a4);
 102
 103         ret = hid_parse(hdev);
 104         if (ret) {
 105                 hid_err(hdev, "parse failed\n");
 106                 return ret;
 107         }
 108
 109         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 110         if (ret) {
 111                 hid_err(hdev, "hw start failed\n");
 112                 return ret;
 113         }
 114
 115         return 0;
 116 }
 117
 118 static const struct hid_device_id a4_devices[] = {
 119         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 120                 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 121         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 122                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 123         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 124                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 125         { }
 126 };
 127 MODULE_DEVICE_TABLE(hid, a4_devices);
 128
 129 static struct hid_driver a4_driver = {
 130         .name = "a4tech",
 131         .id_table = a4_devices,
 132         .input_mapped = a4_input_mapped,
 133         .event = a4_event,
 134         .probe = a4_probe,
 135 };
 136 module_hid_driver(a4_driver);
 137
 138 MODULE_LICENSE("GPL");