LXR linux/drivers/hid/hid-viewsonic.c

   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, 0x02,             /*  Usage (Pen),                        */
  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