whiterose

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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 */
     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");