drivers/hid/hid-ezkey.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  HID driver for some ezkey "special" devices
0004  *
0005  *  Copyright (c) 1999 Andreas Gal
0006  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
0007  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
0008  *  Copyright (c) 2006-2007 Jiri Kosina
0009  *  Copyright (c) 2008 Jiri Slaby
0010  */
0011
0012 /*
0013  */
0014
0015 #include <linux/device.h>
0016 #include <linux/input.h>
0017 #include <linux/hid.h>
0018 #include <linux/module.h>
0019
0020 #include "hid-ids.h"
0021
0022 #define ez_map_rel(c)   hid_map_usage(hi, usage, bit, max, EV_REL, (c))
0023 #define ez_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
0024
0025 static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
0026         struct hid_field *field, struct hid_usage *usage,
0027         unsigned long **bit, int *max)
0028 {
0029     if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
0030         return 0;
0031
0032     switch (usage->hid & HID_USAGE) {
0033     case 0x230: ez_map_key(BTN_MOUSE);  break;
0034     case 0x231: ez_map_rel(REL_WHEEL);  break;
0035     /*
0036      * this keyboard has a scrollwheel implemented in
0037      * totally broken way. We map this usage temporarily
0038      * to HWHEEL and handle it in the event quirk handler
0039      */
0040     case 0x232: ez_map_rel(REL_HWHEEL); break;
0041     default:
0042         return 0;
0043     }
0044     return 1;
0045 }
0046
0047 static int ez_event(struct hid_device *hdev, struct hid_field *field,
0048         struct hid_usage *usage, __s32 value)
0049 {
0050     if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
0051             !usage->type)
0052         return 0;
0053
0054     /* handle the temporary quirky mapping to HWHEEL */
0055     if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
0056         struct input_dev *input = field->hidinput->input;
0057         input_event(input, usage->type, REL_WHEEL, -value);
0058         return 1;
0059     }
0060
0061     return 0;
0062 }
0063
0064 static const struct hid_device_id ez_devices[] = {
0065     { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
0066     { }
0067 };
0068 MODULE_DEVICE_TABLE(hid, ez_devices);
0069
0070 static struct hid_driver ez_driver = {
0071     .name = "ezkey",
0072     .id_table = ez_devices,
0073     .input_mapping = ez_input_mapping,
0074     .event = ez_event,
0075 };
0076 module_hid_driver(ez_driver);
0077
0078 MODULE_LICENSE("GPL");