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Linux/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");
139 

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