cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-viewsonic.c (4573B)

      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");