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 */
  25 static __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
  73 static __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
  89 static 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 };
  96 MODULE_DEVICE_TABLE(hid, viewsonic_devices);
  97
  98 static struct hid_driver viewsonic_driver = {
  99         .name = "viewsonic",
 100         .id_table = viewsonic_devices,
 101         .report_fixup = viewsonic_report_fixup,
 102 };
 103 module_hid_driver(viewsonic_driver);
 104
 105 MODULE_LICENSE("GPL");