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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>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* HID driver for some sunplus "special" devices
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2006-2007 Jiri Kosina
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* Copyright (c) 2008 Jiri Slaby
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*/
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/*
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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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static const __u8 *sp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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if (*rsize >= 112 && rdesc[104] == 0x26 && rdesc[105] == 0x80 &&
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rdesc[106] == 0x03) {
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hid_info(hdev, "fixing up Sunplus Wireless Desktop report descriptor\n");
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rdesc[105] = rdesc[110] = 0x03;
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rdesc[106] = rdesc[111] = 0x21;
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}
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return rdesc;
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}
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#define sp_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
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EV_KEY, (c))
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static int sp_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
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return 0;
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switch (usage->hid & HID_USAGE) {
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case 0x2003: sp_map_key_clear(KEY_ZOOMIN); break;
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case 0x2103: sp_map_key_clear(KEY_ZOOMOUT); break;
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default:
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return 0;
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}
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return 1;
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}
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static const struct hid_device_id sp_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_SUNPLUS, USB_DEVICE_ID_SUNPLUS_WDESKTOP) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, sp_devices);
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static struct hid_driver sp_driver = {
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.name = "sunplus",
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.id_table = sp_devices,
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.report_fixup = sp_report_fixup,
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.input_mapping = sp_input_mapping,
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};
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module_hid_driver(sp_driver);
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MODULE_DESCRIPTION("HID driver for some sunplus \"special\" devices");
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MODULE_LICENSE("GPL");
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