| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * HID driver for Holtek keyboard |
| * Copyright (c) 2012 Tom Harwood |
| */ |
| |
| /* |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/hid.h> |
| #include <linux/module.h> |
| #include <linux/usb.h> |
| |
| #include "hid-ids.h" |
| #include "usbhid/usbhid.h" |
| |
| /* Holtek based keyboards (USB ID 04d9:a055) have the following issues: |
| * - The report descriptor specifies an excessively large number of consumer |
| * usages (2^15), which is more than HID_MAX_USAGES. This prevents proper |
| * parsing of the report descriptor. |
| * - The report descriptor reports on caps/scroll/num lock key presses, but |
| * doesn't have an LED output usage block. |
| * |
| * The replacement descriptor below fixes the number of consumer usages, |
| * and provides an LED output usage block. LED output events are redirected |
| * to the boot interface. |
| */ |
| |
| static __u8 holtek_kbd_rdesc_fixed[] = { |
| /* Original report descriptor, with reduced number of consumer usages */ |
| 0x05, 0x01, /* Usage Page (Desktop), */ |
| 0x09, 0x80, /* Usage (Sys Control), */ |
| 0xA1, 0x01, /* Collection (Application), */ |
| 0x85, 0x01, /* Report ID (1), */ |
| 0x19, 0x81, /* Usage Minimum (Sys Power Down), */ |
| 0x29, 0x83, /* Usage Maximum (Sys Wake Up), */ |
| 0x15, 0x00, /* Logical Minimum (0), */ |
| 0x25, 0x01, /* Logical Maximum (1), */ |
| 0x95, 0x03, /* Report Count (3), */ |
| 0x75, 0x01, /* Report Size (1), */ |
| 0x81, 0x02, /* Input (Variable), */ |
| 0x95, 0x01, /* Report Count (1), */ |
| 0x75, 0x05, /* Report Size (5), */ |
| 0x81, 0x01, /* Input (Constant), */ |
| 0xC0, /* End Collection, */ |
| 0x05, 0x0C, /* Usage Page (Consumer), */ |
| 0x09, 0x01, /* Usage (Consumer Control), */ |
| 0xA1, 0x01, /* Collection (Application), */ |
| 0x85, 0x02, /* Report ID (2), */ |
| 0x19, 0x00, /* Usage Minimum (00h), */ |
| 0x2A, 0xFF, 0x2F, /* Usage Maximum (0x2FFF), previously 0x7FFF */ |
| 0x15, 0x00, /* Logical Minimum (0), */ |
| 0x26, 0xFF, 0x2F, /* Logical Maximum (0x2FFF),previously 0x7FFF*/ |
| 0x95, 0x01, /* Report Count (1), */ |
| 0x75, 0x10, /* Report Size (16), */ |
| 0x81, 0x00, /* Input, */ |
| 0xC0, /* End Collection, */ |
| 0x05, 0x01, /* Usage Page (Desktop), */ |
| 0x09, 0x06, /* Usage (Keyboard), */ |
| 0xA1, 0x01, /* Collection (Application), */ |
| 0x85, 0x03, /* Report ID (3), */ |
| 0x95, 0x38, /* Report Count (56), */ |
| 0x75, 0x01, /* Report Size (1), */ |
| 0x15, 0x00, /* Logical Minimum (0), */ |
| 0x25, 0x01, /* Logical Maximum (1), */ |
| 0x05, 0x07, /* Usage Page (Keyboard), */ |
| 0x19, 0xE0, /* Usage Minimum (KB Leftcontrol), */ |
| 0x29, 0xE7, /* Usage Maximum (KB Right GUI), */ |
| 0x19, 0x00, /* Usage Minimum (None), */ |
| 0x29, 0x2F, /* Usage Maximum (KB Lboxbracket And Lbrace),*/ |
| 0x81, 0x02, /* Input (Variable), */ |
| 0xC0, /* End Collection, */ |
| 0x05, 0x01, /* Usage Page (Desktop), */ |
| 0x09, 0x06, /* Usage (Keyboard), */ |
| 0xA1, 0x01, /* Collection (Application), */ |
| 0x85, 0x04, /* Report ID (4), */ |
| 0x95, 0x38, /* Report Count (56), */ |
| 0x75, 0x01, /* Report Size (1), */ |
| 0x15, 0x00, /* Logical Minimum (0), */ |
| 0x25, 0x01, /* Logical Maximum (1), */ |
| 0x05, 0x07, /* Usage Page (Keyboard), */ |
| 0x19, 0x30, /* Usage Minimum (KB Rboxbracket And Rbrace),*/ |
| 0x29, 0x67, /* Usage Maximum (KP Equals), */ |
| 0x81, 0x02, /* Input (Variable), */ |
| 0xC0, /* End Collection */ |
| |
| /* LED usage for the boot protocol interface */ |
| 0x05, 0x01, /* Usage Page (Desktop), */ |
| 0x09, 0x06, /* Usage (Keyboard), */ |
| 0xA1, 0x01, /* Collection (Application), */ |
| 0x05, 0x08, /* Usage Page (LED), */ |
| 0x19, 0x01, /* Usage Minimum (01h), */ |
| 0x29, 0x03, /* Usage Maximum (03h), */ |
| 0x15, 0x00, /* Logical Minimum (0), */ |
| 0x25, 0x01, /* Logical Maximum (1), */ |
| 0x75, 0x01, /* Report Size (1), */ |
| 0x95, 0x03, /* Report Count (3), */ |
| 0x91, 0x02, /* Output (Variable), */ |
| 0x95, 0x05, /* Report Count (5), */ |
| 0x91, 0x01, /* Output (Constant), */ |
| 0xC0, /* End Collection */ |
| }; |
| |
| static __u8 *holtek_kbd_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
| unsigned int *rsize) |
| { |
| struct usb_interface *intf = to_usb_interface(hdev->dev.parent); |
| |
| if (intf->cur_altsetting->desc.bInterfaceNumber == 1) { |
| rdesc = holtek_kbd_rdesc_fixed; |
| *rsize = sizeof(holtek_kbd_rdesc_fixed); |
| } |
| return rdesc; |
| } |
| |
| static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type, |
| unsigned int code, |
| int value) |
| { |
| struct hid_device *hid = input_get_drvdata(dev); |
| struct usb_device *usb_dev = hid_to_usb_dev(hid); |
| |
| /* Locate the boot interface, to receive the LED change events */ |
| struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0); |
| struct hid_device *boot_hid; |
| struct hid_input *boot_hid_input; |
| |
| if (unlikely(boot_interface == NULL)) |
| return -ENODEV; |
| |
| boot_hid = usb_get_intfdata(boot_interface); |
| if (list_empty(&boot_hid->inputs)) { |
| hid_err(hid, "no inputs found\n"); |
| return -ENODEV; |
| } |
| boot_hid_input = list_first_entry(&boot_hid->inputs, |
| struct hid_input, list); |
| |
| return boot_hid_input->input->event(boot_hid_input->input, type, code, |
| value); |
| } |
| |
| static int holtek_kbd_probe(struct hid_device *hdev, |
| const struct hid_device_id *id) |
| { |
| struct usb_interface *intf; |
| int ret; |
| |
| if (!hid_is_usb(hdev)) |
| return -EINVAL; |
| |
| ret = hid_parse(hdev); |
| if (!ret) |
| ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
| |
| intf = to_usb_interface(hdev->dev.parent); |
| if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) { |
| struct hid_input *hidinput; |
| list_for_each_entry(hidinput, &hdev->inputs, list) { |
| hidinput->input->event = holtek_kbd_input_event; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static const struct hid_device_id holtek_kbd_devices[] = { |
| { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT, |
| USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD) }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(hid, holtek_kbd_devices); |
| |
| static struct hid_driver holtek_kbd_driver = { |
| .name = "holtek_kbd", |
| .id_table = holtek_kbd_devices, |
| .report_fixup = holtek_kbd_report_fixup, |
| .probe = holtek_kbd_probe |
| }; |
| module_hid_driver(holtek_kbd_driver); |
| |
| MODULE_DESCRIPTION("HID driver for Holtek keyboard"); |
| MODULE_LICENSE("GPL"); |
