drivers/hid/hid-maltron.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * HID driver for Maltron L90
   4  *
   5  * Copyright (c) 1999 Andreas Gal
   6  * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7  * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8  * Copyright (c) 2008 Jiri Slaby
   9  * Copyright (c) 2012 David Dillow <dave@thedillows.org>
  10  * Copyright (c) 2006-2013 Jiri Kosina
  11  * Copyright (c) 2013 Colin Leitner <colin.leitner@gmail.com>
  12  * Copyright (c) 2014-2016 Frank Praznik <frank.praznik@gmail.com>
  13  * Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com>
  14  * Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com>
  15  * Copyright (c) 2018 William Whistler <wtbw@wtbw.co.uk>
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/hid.h>
  20 #include <linux/module.h>
  21
  22 #include "hid-ids.h"
  23
  24 /* The original buggy USB descriptor */
  25 static u8 maltron_rdesc_o[] = {
  26         0x05, 0x01,        /* Usage Page (Generic Desktop Ctrls) */
  27         0x09, 0x80,        /* Usage (Sys Control)                */
  28         0xA1, 0x01,        /* Collection (Application)           */
  29         0x85, 0x02,        /*   Report ID (2)                    */
  30         0x75, 0x01,        /*   Report Size (1)                  */
  31         0x95, 0x01,        /*   Report Count (1)                 */
  32         0x15, 0x00,        /*   Logical Minimum (0)              */
  33         0x25, 0x01,        /*   Logical Maximum (1)              */
  34         0x09, 0x82,        /*   Usage (Sys Sleep)                */
  35         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  36         0x09, 0x82,        /*   Usage (Sys Sleep)                */
  37         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  38         0x09, 0x83,        /*   Usage (Sys Wake Up)              */
  39         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  40         0x75, 0x05,        /*   Report Size (5)                  */
  41         0x81, 0x01,        /*   Input (Const,Array,Abs)          */
  42         0xC0,              /* End Collection                     */
  43         0x05, 0x0C,        /* Usage Page (Consumer)              */
  44         0x09, 0x01,        /* Usage (Consumer Control)           */
  45         0xA1, 0x01,        /* Collection (Application)           */
  46         0x85, 0x03,        /*   Report ID (3)                    */
  47         0x95, 0x01,        /*   Report Count (1)                 */
  48         0x75, 0x10,        /*   Report Size (16)                 */
  49         0x19, 0x00,        /*   Usage Minimum (Unassigned)       */
  50         0x2A, 0xFF, 0x7F,  /*   Usage Maximum (0x7FFF)           */
  51         0x81, 0x00,        /*   Input (Data,Array,Abs)           */
  52         0xC0,              /* End Collection                     */
  53         0x06, 0x7F, 0xFF,  /* Usage Page (Vendor Defined 0xFF7F) */
  54         0x09, 0x01,        /* Usage (0x01)                       */
  55         0xA1, 0x01,        /* Collection (Application)           */
  56         0x85, 0x04,        /*   Report ID (4)                    */
  57         0x95, 0x01,        /*   Report Count (1)                 */
  58         0x75, 0x10,        /*   Report Size (16)                 */
  59         0x19, 0x00,        /*   Usage Minimum (0x00)             */
  60         0x2A, 0xFF, 0x7F,  /*   Usage Maximum (0x7FFF)           */
  61         0x81, 0x00,        /*   Input (Data,Array,Abs)           */
  62         0x75, 0x02,        /*   Report Size (2)                  */
  63         0x25, 0x02,        /*   Logical Maximum (2)              */
  64         0x09, 0x90,        /*   Usage (0x90)                     */
  65         0xB1, 0x02,        /*   Feature (Data,Var,Abs)           */
  66         0x75, 0x06,        /*   Report Size (6)                  */
  67         0xB1, 0x01,        /*   Feature (Const,Array,Abs)        */
  68         0x75, 0x01,        /*   Report Size (1)                  */
  69         0x25, 0x01,        /*   Logical Maximum (1)              */
  70         0x05, 0x08,        /*   Usage Page (LEDs)                */
  71         0x09, 0x2A,        /*   Usage (On-Line)                  */
  72         0x91, 0x02,        /*   Output (Data,Var,Abs)            */
  73         0x09, 0x4B,        /*   Usage (Generic Indicator)        */
  74         0x91, 0x02,        /*   Output (Data,Var,Abs)            */
  75         0x75, 0x06,        /*   Report Size (6)                  */
  76         0x95, 0x01,        /*   Report Count (1)                 */
  77         0x91, 0x01,        /*   Output (Const,Array,Abs)         */
  78         0xC0               /* End Collection                     */
  79 };
  80
  81 /* The patched descriptor, allowing media key events to be accepted as valid */
  82 static u8 maltron_rdesc[] = {
  83         0x05, 0x01,        /* Usage Page (Generic Desktop Ctrls) */
  84         0x09, 0x80,        /* Usage (Sys Control)                */
  85         0xA1, 0x01,        /* Collection (Application)           */
  86         0x85, 0x02,        /*   Report ID (2)                    */
  87         0x75, 0x01,        /*   Report Size (1)                  */
  88         0x95, 0x01,        /*   Report Count (1)                 */
  89         0x15, 0x00,        /*   Logical Minimum (0)              */
  90         0x25, 0x01,        /*   Logical Maximum (1)              */
  91         0x09, 0x82,        /*   Usage (Sys Sleep)                */
  92         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  93         0x09, 0x82,        /*   Usage (Sys Sleep)                */
  94         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  95         0x09, 0x83,        /*   Usage (Sys Wake Up)              */
  96         0x81, 0x06,        /*   Input (Data,Var,Rel)             */
  97         0x75, 0x05,        /*   Report Size (5)                  */
  98         0x81, 0x01,        /*   Input (Const,Array,Abs)          */
  99         0xC0,              /* End Collection                     */
 100         0x05, 0x0C,        /* Usage Page (Consumer)              */
 101         0x09, 0x01,        /* Usage (Consumer Control)           */
 102         0xA1, 0x01,        /* Collection (Application)           */
 103         0x85, 0x03,        /*   Report ID (3)                    */
 104         0x15, 0x00,        /*   Logical Minimum (0)              - changed */
 105         0x26, 0xFF, 0x7F,  /*   Logical Maximum (32767)          - changed */
 106         0x95, 0x01,        /*   Report Count (1)                 */
 107         0x75, 0x10,        /*   Report Size (16)                 */
 108         0x19, 0x00,        /*   Usage Minimum (Unassigned)       */
 109         0x2A, 0xFF, 0x7F,  /*   Usage Maximum (0x7FFF)           */
 110         0x81, 0x00,        /*   Input (Data,Array,Abs)           */
 111         0xC0,              /* End Collection                     */
 112         0x06, 0x7F, 0xFF,  /* Usage Page (Vendor Defined 0xFF7F) */
 113         0x09, 0x01,        /* Usage (0x01)                       */
 114         0xA1, 0x01,        /* Collection (Application)           */
 115         0x85, 0x04,        /*   Report ID (4)                    */
 116         0x95, 0x01,        /*   Report Count (1)                 */
 117         0x75, 0x10,        /*   Report Size (16)                 */
 118         0x19, 0x00,        /*   Usage Minimum (0x00)             */
 119         0x2A, 0xFF, 0x7F,  /*   Usage Maximum (0x7FFF)           */
 120         0x81, 0x00,        /*   Input (Data,Array,Abs)           */
 121         0x75, 0x02,        /*   Report Size (2)                  */
 122         0x25, 0x02,        /*   Logical Maximum (2)              */
 123         0x09, 0x90,        /*   Usage (0x90)                     */
 124         0xB1, 0x02,        /*   Feature (Data,Var,Abs)           */
 125         0x75, 0x06,        /*   Report Size (6)                  */
 126         0xB1, 0x01,        /*   Feature (Const,Array,Abs)        */
 127         0x75, 0x01,        /*   Report Size (1)                  */
 128         0x25, 0x01,        /*   Logical Maximum (1)              */
 129         0x05, 0x08,        /*   Usage Page (LEDs)                */
 130         0x09, 0x2A,        /*   Usage (On-Line)                  */
 131         0x91, 0x02,        /*   Output (Data,Var,Abs)            */
 132         0x09, 0x4B,        /*   Usage (Generic Indicator)        */
 133         0x91, 0x02,        /*   Output (Data,Var,Abs)            */
 134         0x75, 0x06,        /*   Report Size (6)                  */
 135         0x95, 0x01,        /*   Report Count (1)                 */
 136         0x91, 0x01,        /*   Output (Const,Array,Abs)         */
 137         0xC0               /* End Collection                     */
 138 };
 139
 140 static __u8 *maltron_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 141                                   unsigned int *rsize)
 142 {
 143         if (*rsize == sizeof(maltron_rdesc_o) &&
 144             !memcmp(maltron_rdesc_o, rdesc, sizeof(maltron_rdesc_o))) {
 145                 hid_info(hdev, "Replacing Maltron L90 keyboard report descriptor\n");
 146                 *rsize = sizeof(maltron_rdesc);
 147                 return maltron_rdesc;
 148         }
 149         return rdesc;
 150 }
 151
 152 static const struct hid_device_id maltron_devices[] = {
 153         { HID_USB_DEVICE(USB_VENDOR_ID_ALCOR, USB_DEVICE_ID_ALCOR_MALTRON_KB)},
 154         { }
 155 };
 156 MODULE_DEVICE_TABLE(hid, maltron_devices);
 157
 158 static struct hid_driver maltron_driver = {
 159         .name = "maltron",
 160         .id_table = maltron_devices,
 161         .report_fixup = maltron_report_fixup
 162 };
 163 module_hid_driver(maltron_driver);
 164
 165 MODULE_LICENSE("GPL");