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 #define A4_WHEEL_ORIENTATION    (HID_UP_GENDESK | 0x000000b8)
  30
  31 struct a4tech_sc {
  32         unsigned long quirks;
  33         unsigned int hw_wheel;
  34         __s32 delayed_value;
  35 };
  36
  37 static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  38                             struct hid_field *field, struct hid_usage *usage,
  39                             unsigned long **bit, int *max)
  40 {
  41         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  42
  43         if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
  44             usage->hid == A4_WHEEL_ORIENTATION) {
  45                 /*
  46                  * We do not want to have this usage mapped to anything as it's
  47                  * nonstandard and doesn't really behave like an HID report.
  48                  * It's only selecting the orientation (vertical/horizontal) of
  49                  * the previous mouse wheel report. The input_events will be
  50                  * generated once both reports are recorded in a4_event().
  51                  */
  52                 return -1;
  53         }
  54
  55         return 0;
  56
  57 }
  58
  59 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  60                 struct hid_field *field, struct hid_usage *usage,
  61                 unsigned long **bit, int *max)
  62 {
  63         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  64
  65         if (usage->type == EV_REL && usage->code == REL_WHEEL)
  66                 set_bit(REL_HWHEEL, *bit);
  67
  68         if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
  69                 return -1;
  70
  71         return 0;
  72 }
  73
  74 static int a4_event(struct hid_device *hdev, struct hid_field *field,
  75                 struct hid_usage *usage, __s32 value)
  76 {
  77         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
  78         struct input_dev *input;
  79
  80         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
  81                 return 0;
  82
  83         input = field->hidinput->input;
  84
  85         if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
  86                 if (usage->type == EV_REL && usage->code == REL_WHEEL) {
  87                         a4->delayed_value = value;
  88                         return 1;
  89                 }
  90
  91                 if (usage->hid == A4_WHEEL_ORIENTATION) {
  92                         input_event(input, EV_REL, value ? REL_HWHEEL :
  93                                         REL_WHEEL, a4->delayed_value);
  94                         return 1;
  95                 }
  96         }
  97
  98         if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
  99                 a4->hw_wheel = !!value;
 100                 return 1;
 101         }
 102
 103         if (usage->code == REL_WHEEL && a4->hw_wheel) {
 104                 input_event(input, usage->type, REL_HWHEEL, value);
 105                 return 1;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
 112 {
 113         struct a4tech_sc *a4;
 114         int ret;
 115
 116         a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
 117         if (a4 == NULL) {
 118                 hid_err(hdev, "can't alloc device descriptor\n");
 119                 return -ENOMEM;
 120         }
 121
 122         a4->quirks = id->driver_data;
 123
 124         hid_set_drvdata(hdev, a4);
 125
 126         ret = hid_parse(hdev);
 127         if (ret) {
 128                 hid_err(hdev, "parse failed\n");
 129                 return ret;
 130         }
 131
 132         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 133         if (ret) {
 134                 hid_err(hdev, "hw start failed\n");
 135                 return ret;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static const struct hid_device_id a4_devices[] = {
 142         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
 143                 .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
 144         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
 145                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 146         { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
 147                 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
 148         { }
 149 };
 150 MODULE_DEVICE_TABLE(hid, a4_devices);
 151
 152 static struct hid_driver a4_driver = {
 153         .name = "a4tech",
 154         .id_table = a4_devices,
 155         .input_mapping = a4_input_mapping,
 156         .input_mapped = a4_input_mapped,
 157         .event = a4_event,
 158         .probe = a4_probe,
 159 };
 160 module_hid_driver(a4_driver);
 161
 162 MODULE_LICENSE("GPL");