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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>
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* USB HID driver for Glorious PC Gaming Race
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* Glorious Model O, O- and D mice.
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*
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* Copyright (c) 2020 Samuel Čavoj <sammko@sammserver.com>
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*/
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/*
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*/
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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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MODULE_AUTHOR("Samuel Čavoj <sammko@sammserver.com>");
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MODULE_DESCRIPTION("HID driver for Glorious PC Gaming Race mice");
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/*
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* Glorious Model O and O- specify the const flag in the consumer input
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* report descriptor, which leads to inputs being ignored. Fix this
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* by patching the descriptor.
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*
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* Glorious Model I incorrectly specifes the Usage Minimum for its
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* keyboard HID report, causing keycodes to be misinterpreted.
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* Fix this by setting Usage Minimum to 0 in that report.
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*/
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static const __u8 *glorious_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 == 213 &&
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rdesc[84] == 129 && rdesc[112] == 129 && rdesc[140] == 129 &&
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rdesc[85] == 3 && rdesc[113] == 3 && rdesc[141] == 3) {
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hid_info(hdev, "patching Glorious Model O consumer control report descriptor\n");
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rdesc[85] = rdesc[113] = rdesc[141] = \
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HID_MAIN_ITEM_VARIABLE | HID_MAIN_ITEM_RELATIVE;
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}
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if (*rsize == 156 && rdesc[41] == 1) {
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hid_info(hdev, "patching Glorious Model I keyboard report descriptor\n");
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rdesc[41] = 0;
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}
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return rdesc;
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}
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static void glorious_update_name(struct hid_device *hdev)
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{
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const char *model = "Device";
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switch (hdev->product) {
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case USB_DEVICE_ID_GLORIOUS_MODEL_O:
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model = "Model O"; break;
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case USB_DEVICE_ID_GLORIOUS_MODEL_D:
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model = "Model D"; break;
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case USB_DEVICE_ID_GLORIOUS_MODEL_I:
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model = "Model I"; break;
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}
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snprintf(hdev->name, sizeof(hdev->name), "%s %s", "Glorious", model);
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}
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static int glorious_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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int ret;
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hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
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ret = hid_parse(hdev);
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if (ret)
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return ret;
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glorious_update_name(hdev);
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return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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}
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static const struct hid_device_id glorious_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_SINOWEALTH,
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USB_DEVICE_ID_GLORIOUS_MODEL_O) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_SINOWEALTH,
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USB_DEVICE_ID_GLORIOUS_MODEL_D) },
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{ HID_USB_DEVICE(USB_VENDOR_ID_LAVIEW,
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USB_DEVICE_ID_GLORIOUS_MODEL_I) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, glorious_devices);
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static struct hid_driver glorious_driver = {
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.name = "glorious",
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.id_table = glorious_devices,
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.probe = glorious_probe,
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.report_fixup = glorious_report_fixup
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};
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module_hid_driver(glorious_driver);
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MODULE_LICENSE("GPL");
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