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Many HID drivers assume that the HID device assigned to them is a USB device as that was the only way HID devices used to be able to be created in Linux. However, with the additional ways that HID devices can be created for many different bus types, that is no longer true, so properly check that we have a USB device associated with the HID device before allowing a driver that makes this assumption to claim it. Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Michael Zaidman <michael.zaidman@gmail.com> Cc: Stefan Achatz <erazor_de@users.sourceforge.net> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: linux-input@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> [bentiss: amended for thrustmater.c hunk to apply] Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20211201183503.2373082-3-gregkh@linuxfoundation.org
180 lines
7.9 KiB
C
180 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* HID driver for Holtek keyboard
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* Copyright (c) 2012 Tom Harwood
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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 <linux/usb.h>
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#include "hid-ids.h"
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#include "usbhid/usbhid.h"
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/* Holtek based keyboards (USB ID 04d9:a055) have the following issues:
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* - The report descriptor specifies an excessively large number of consumer
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* usages (2^15), which is more than HID_MAX_USAGES. This prevents proper
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* parsing of the report descriptor.
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* - The report descriptor reports on caps/scroll/num lock key presses, but
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* doesn't have an LED output usage block.
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*
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* The replacement descriptor below fixes the number of consumer usages,
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* and provides an LED output usage block. LED output events are redirected
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* to the boot interface.
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*/
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static __u8 holtek_kbd_rdesc_fixed[] = {
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/* Original report descriptor, with reduced number of consumer usages */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x09, 0x80, /* Usage (Sys Control), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x01, /* Report ID (1), */
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0x19, 0x81, /* Usage Minimum (Sys Power Down), */
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0x29, 0x83, /* Usage Maximum (Sys Wake Up), */
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0x15, 0x00, /* Logical Minimum (0), */
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0x25, 0x01, /* Logical Maximum (1), */
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0x95, 0x03, /* Report Count (3), */
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0x75, 0x01, /* Report Size (1), */
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0x81, 0x02, /* Input (Variable), */
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0x95, 0x01, /* Report Count (1), */
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0x75, 0x05, /* Report Size (5), */
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0x81, 0x01, /* Input (Constant), */
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0xC0, /* End Collection, */
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0x05, 0x0C, /* Usage Page (Consumer), */
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0x09, 0x01, /* Usage (Consumer Control), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x02, /* Report ID (2), */
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0x19, 0x00, /* Usage Minimum (00h), */
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0x2A, 0xFF, 0x2F, /* Usage Maximum (0x2FFF), previously 0x7FFF */
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0x15, 0x00, /* Logical Minimum (0), */
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0x26, 0xFF, 0x2F, /* Logical Maximum (0x2FFF),previously 0x7FFF*/
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0x95, 0x01, /* Report Count (1), */
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0x75, 0x10, /* Report Size (16), */
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0x81, 0x00, /* Input, */
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0xC0, /* End Collection, */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x09, 0x06, /* Usage (Keyboard), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x03, /* Report ID (3), */
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0x95, 0x38, /* Report Count (56), */
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0x75, 0x01, /* Report Size (1), */
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0x15, 0x00, /* Logical Minimum (0), */
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0x25, 0x01, /* Logical Maximum (1), */
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0x05, 0x07, /* Usage Page (Keyboard), */
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0x19, 0xE0, /* Usage Minimum (KB Leftcontrol), */
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0x29, 0xE7, /* Usage Maximum (KB Right GUI), */
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0x19, 0x00, /* Usage Minimum (None), */
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0x29, 0x2F, /* Usage Maximum (KB Lboxbracket And Lbrace),*/
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0x81, 0x02, /* Input (Variable), */
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0xC0, /* End Collection, */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x09, 0x06, /* Usage (Keyboard), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x04, /* Report ID (4), */
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0x95, 0x38, /* Report Count (56), */
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0x75, 0x01, /* Report Size (1), */
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0x15, 0x00, /* Logical Minimum (0), */
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0x25, 0x01, /* Logical Maximum (1), */
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0x05, 0x07, /* Usage Page (Keyboard), */
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0x19, 0x30, /* Usage Minimum (KB Rboxbracket And Rbrace),*/
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0x29, 0x67, /* Usage Maximum (KP Equals), */
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0x81, 0x02, /* Input (Variable), */
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0xC0, /* End Collection */
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/* LED usage for the boot protocol interface */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x09, 0x06, /* Usage (Keyboard), */
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0xA1, 0x01, /* Collection (Application), */
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0x05, 0x08, /* Usage Page (LED), */
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0x19, 0x01, /* Usage Minimum (01h), */
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0x29, 0x03, /* Usage Maximum (03h), */
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0x15, 0x00, /* 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, 0x03, /* Report Count (3), */
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0x91, 0x02, /* Output (Variable), */
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0x95, 0x05, /* Report Count (5), */
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0x91, 0x01, /* Output (Constant), */
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0xC0, /* End Collection */
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};
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static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
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if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
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rdesc = holtek_kbd_rdesc_fixed;
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*rsize = sizeof(holtek_kbd_rdesc_fixed);
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}
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return rdesc;
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}
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static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type,
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unsigned int code,
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int value)
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{
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struct hid_device *hid = input_get_drvdata(dev);
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struct usb_device *usb_dev = hid_to_usb_dev(hid);
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/* Locate the boot interface, to receive the LED change events */
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struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0);
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struct hid_device *boot_hid;
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struct hid_input *boot_hid_input;
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if (unlikely(boot_interface == NULL))
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return -ENODEV;
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boot_hid = usb_get_intfdata(boot_interface);
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boot_hid_input = list_first_entry(&boot_hid->inputs,
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struct hid_input, list);
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return boot_hid_input->input->event(boot_hid_input->input, type, code,
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value);
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}
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static int holtek_kbd_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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struct usb_interface *intf;
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int ret;
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if (!hid_is_usb(hdev))
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return -EINVAL;
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ret = hid_parse(hdev);
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if (!ret)
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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intf = to_usb_interface(hdev->dev.parent);
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if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) {
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struct hid_input *hidinput;
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list_for_each_entry(hidinput, &hdev->inputs, list) {
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hidinput->input->event = holtek_kbd_input_event;
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}
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}
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return ret;
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}
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static const struct hid_device_id holtek_kbd_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
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USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, holtek_kbd_devices);
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static struct hid_driver holtek_kbd_driver = {
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.name = "holtek_kbd",
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.id_table = holtek_kbd_devices,
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.report_fixup = holtek_kbd_report_fixup,
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.probe = holtek_kbd_probe
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};
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module_hid_driver(holtek_kbd_driver);
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MODULE_LICENSE("GPL");
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