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"); 106