1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *  HID driver for ViewSonic devices not fully compliant with HID standard
4 *
5 *  Copyright (c) 2017 Nikolai Kondrashov
6 */
7
8/*
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 */
14
15#include <linux/device.h>
16#include <linux/hid.h>
17#include <linux/module.h>
18
19#include "hid-ids.h"
20
21/* Size of the original descriptor of PD1011 signature pad */
22#define PD1011_RDESC_ORIG_SIZE	408
23
24/* Fixed report descriptor of PD1011 signature pad */
25static __u8 pd1011_rdesc_fixed[] = {
26	0x05, 0x0D,             /*  Usage Page (Digitizer),             */
27	0x09, 0x01,             /*  Usage (Digitizer),                  */
28	0xA1, 0x01,             /*  Collection (Application),           */
29	0x85, 0x02,             /*      Report ID (2),                  */
30	0x09, 0x20,             /*      Usage (Stylus),                 */
31	0xA0,                   /*      Collection (Physical),          */
32	0x75, 0x10,             /*          Report Size (16),           */
33	0x95, 0x01,             /*          Report Count (1),           */
34	0xA4,                   /*          Push,                       */
35	0x05, 0x01,             /*          Usage Page (Desktop),       */
36	0x65, 0x13,             /*          Unit (Inch),                */
37	0x55, 0xFD,             /*          Unit Exponent (-3),         */
38	0x34,                   /*          Physical Minimum (0),       */
39	0x09, 0x30,             /*          Usage (X),                  */
40	0x46, 0x5D, 0x21,       /*          Physical Maximum (8541),    */
41	0x27, 0x80, 0xA9,
42		0x00, 0x00,     /*          Logical Maximum (43392),    */
43	0x81, 0x02,             /*          Input (Variable),           */
44	0x09, 0x31,             /*          Usage (Y),                  */
45	0x46, 0xDA, 0x14,       /*          Physical Maximum (5338),    */
46	0x26, 0xF0, 0x69,       /*          Logical Maximum (27120),    */
47	0x81, 0x02,             /*          Input (Variable),           */
48	0xB4,                   /*          Pop,                        */
49	0x14,                   /*          Logical Minimum (0),        */
50	0x25, 0x01,             /*          Logical Maximum (1),        */
51	0x75, 0x01,             /*          Report Size (1),            */
52	0x95, 0x01,             /*          Report Count (1),           */
53	0x81, 0x03,             /*          Input (Constant, Variable), */
54	0x09, 0x32,             /*          Usage (In Range),           */
55	0x09, 0x42,             /*          Usage (Tip Switch),         */
56	0x95, 0x02,             /*          Report Count (2),           */
57	0x81, 0x02,             /*          Input (Variable),           */
58	0x95, 0x05,             /*          Report Count (5),           */
59	0x81, 0x03,             /*          Input (Constant, Variable), */
60	0x75, 0x10,             /*          Report Size (16),           */
61	0x95, 0x01,             /*          Report Count (1),           */
62	0x09, 0x30,             /*          Usage (Tip Pressure),       */
63	0x15, 0x05,             /*          Logical Minimum (5),        */
64	0x26, 0xFF, 0x07,       /*          Logical Maximum (2047),     */
65	0x81, 0x02,             /*          Input (Variable),           */
66	0x75, 0x10,             /*          Report Size (16),           */
67	0x95, 0x01,             /*          Report Count (1),           */
68	0x81, 0x03,             /*          Input (Constant, Variable), */
69	0xC0,                   /*      End Collection,                 */
70	0xC0                    /*  End Collection                      */
71};
72
73static __u8 *viewsonic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
74				    unsigned int *rsize)
75{
76	switch (hdev->product) {
77	case USB_DEVICE_ID_VIEWSONIC_PD1011:
78	case USB_DEVICE_ID_SIGNOTEC_VIEWSONIC_PD1011:
79		if (*rsize == PD1011_RDESC_ORIG_SIZE) {
80			rdesc = pd1011_rdesc_fixed;
81			*rsize = sizeof(pd1011_rdesc_fixed);
82		}
83		break;
84	}
85
86	return rdesc;
87}
88
89static const struct hid_device_id viewsonic_devices[] = {
90	{ HID_USB_DEVICE(USB_VENDOR_ID_VIEWSONIC,
91				USB_DEVICE_ID_VIEWSONIC_PD1011) },
92	{ HID_USB_DEVICE(USB_VENDOR_ID_SIGNOTEC,
93				USB_DEVICE_ID_SIGNOTEC_VIEWSONIC_PD1011) },
94	{ }
95};
96MODULE_DEVICE_TABLE(hid, viewsonic_devices);
97
98static struct hid_driver viewsonic_driver = {
99	.name = "viewsonic",
100	.id_table = viewsonic_devices,
101	.report_fixup = viewsonic_report_fixup,
102};
103module_hid_driver(viewsonic_driver);
104
105MODULE_LICENSE("GPL");
106