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By allowing the drivers to return a "const *" they can constify their static report arrays. This makes it clear to driver authors that the HID core will not modify those reports and they can be reused for multiple devices. Furthermore security is slightly improved as those reports are protected against accidental or malicious modifications. [bentiss: fixup hid-cougar.c and hid-multitouch.c for latest version of the master branch] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20240803-hid-const-fixup-v2-6-f53d7a7b29d8@weissschuh.net Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
107 lines
4.6 KiB
C
107 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* HID driver for ViewSonic devices not fully compliant with HID standard
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*
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* Copyright (c) 2017 Nikolai Kondrashov
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include "hid-ids.h"
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/* Size of the original descriptor of PD1011 signature pad */
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#define PD1011_RDESC_ORIG_SIZE 408
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/* Fixed report descriptor of PD1011 signature pad */
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static __u8 pd1011_rdesc_fixed[] = {
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0x05, 0x0D, /* Usage Page (Digitizer), */
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0x09, 0x01, /* Usage (Digitizer), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x02, /* Report ID (2), */
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0x09, 0x20, /* Usage (Stylus), */
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0xA0, /* Collection (Physical), */
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0x75, 0x10, /* Report Size (16), */
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0x95, 0x01, /* Report Count (1), */
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0xA4, /* Push, */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x65, 0x13, /* Unit (Inch), */
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0x55, 0xFD, /* Unit Exponent (-3), */
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0x34, /* Physical Minimum (0), */
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0x09, 0x30, /* Usage (X), */
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0x46, 0x5D, 0x21, /* Physical Maximum (8541), */
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0x27, 0x80, 0xA9,
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0x00, 0x00, /* Logical Maximum (43392), */
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0x81, 0x02, /* Input (Variable), */
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0x09, 0x31, /* Usage (Y), */
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0x46, 0xDA, 0x14, /* Physical Maximum (5338), */
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0x26, 0xF0, 0x69, /* Logical Maximum (27120), */
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0x81, 0x02, /* Input (Variable), */
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0xB4, /* Pop, */
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0x14, /* Logical Minimum (0), */
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0x25, 0x01, /* Logical Maximum (1), */
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0x75, 0x01, /* Report Size (1), */
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0x95, 0x01, /* Report Count (1), */
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0x81, 0x03, /* Input (Constant, Variable), */
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0x09, 0x32, /* Usage (In Range), */
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0x09, 0x42, /* Usage (Tip Switch), */
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0x95, 0x02, /* Report Count (2), */
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0x81, 0x02, /* Input (Variable), */
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0x95, 0x05, /* Report Count (5), */
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0x81, 0x03, /* Input (Constant, Variable), */
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0x75, 0x10, /* Report Size (16), */
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0x95, 0x01, /* Report Count (1), */
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0x09, 0x30, /* Usage (Tip Pressure), */
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0x15, 0x05, /* Logical Minimum (5), */
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0x26, 0xFF, 0x07, /* Logical Maximum (2047), */
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0x81, 0x02, /* Input (Variable), */
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0x75, 0x10, /* Report Size (16), */
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0x95, 0x01, /* Report Count (1), */
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0x81, 0x03, /* Input (Constant, Variable), */
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0xC0, /* End Collection, */
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0xC0 /* End Collection */
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};
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static const __u8 *viewsonic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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switch (hdev->product) {
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case USB_DEVICE_ID_VIEWSONIC_PD1011:
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case USB_DEVICE_ID_SIGNOTEC_VIEWSONIC_PD1011:
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if (*rsize == PD1011_RDESC_ORIG_SIZE) {
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rdesc = pd1011_rdesc_fixed;
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*rsize = sizeof(pd1011_rdesc_fixed);
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}
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break;
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}
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return rdesc;
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}
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static const struct hid_device_id viewsonic_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_VIEWSONIC,
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USB_DEVICE_ID_VIEWSONIC_PD1011) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_SIGNOTEC,
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USB_DEVICE_ID_SIGNOTEC_VIEWSONIC_PD1011) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, viewsonic_devices);
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static struct hid_driver viewsonic_driver = {
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.name = "viewsonic",
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.id_table = viewsonic_devices,
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.report_fixup = viewsonic_report_fixup,
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};
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module_hid_driver(viewsonic_driver);
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MODULE_DESCRIPTION("HID driver for ViewSonic devices not fully compliant with HID standard");
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MODULE_LICENSE("GPL");
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