Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/hid/hid-ezkey.c
15111 views
1
/*

2
 *  HID driver for some ezkey "special" devices

3
 *

4
 *  Copyright (c) 1999 Andreas Gal

5
 *  Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>

6
 *  Copyright (c) 2005 Michael Haboustak <[email protected]> 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 ez_map_rel(c)	hid_map_usage(hi, usage, bit, max, EV_REL, (c))

27
#define ez_map_key(c)	hid_map_usage(hi, usage, bit, max, EV_KEY, (c))

28


29
static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,

30
		struct hid_field *field, struct hid_usage *usage,

31
		unsigned long **bit, int *max)

32
{

33
	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)

34
		return 0;

35


36
	switch (usage->hid & HID_USAGE) {

37
	case 0x230: ez_map_key(BTN_MOUSE);	break;

38
	case 0x231: ez_map_rel(REL_WHEEL);	break;

39
	/*

40
	 * this keyboard has a scrollwheel implemented in

41
	 * totally broken way. We map this usage temporarily

42
	 * to HWHEEL and handle it in the event quirk handler

43
	 */

44
	case 0x232: ez_map_rel(REL_HWHEEL);	break;

45
	default:

46
		return 0;

47
	}

48
	return 1;

49
}

50


51
static int ez_event(struct hid_device *hdev, struct hid_field *field,

52
		struct hid_usage *usage, __s32 value)

53
{

54
	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||

55
			!usage->type)

56
		return 0;

57


58
	/* handle the temporary quirky mapping to HWHEEL */

59
	if (usage->type == EV_REL && usage->code == REL_HWHEEL) {

60
		struct input_dev *input = field->hidinput->input;

61
		input_event(input, usage->type, REL_WHEEL, -value);

62
		return 1;

63
	}

64


65
	return 0;

66
}

67


68
static const struct hid_device_id ez_devices[] = {

69
	{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },

70
	{ }

71
};

72
MODULE_DEVICE_TABLE(hid, ez_devices);

73


74
static struct hid_driver ez_driver = {

75
	.name = "ezkey",

76
	.id_table = ez_devices,

77
	.input_mapping = ez_input_mapping,

78
	.event = ez_event,

79
};

80


81
static int __init ez_init(void)

82
{

83
	return hid_register_driver(&ez_driver);

84
}

85


86
static void __exit ez_exit(void)

87
{

88
	hid_unregister_driver(&ez_driver);

89
}

90


91
module_init(ez_init);

92
module_exit(ez_exit);

93
MODULE_LICENSE("GPL");

94


95