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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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+ * 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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+
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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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+
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+#include "hid-ids.h"
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+#include "usbhid/usbhid.h"
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ struct hid_device *boot_hid = usb_get_intfdata(boot_interface);
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+ struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs,
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+ struct hid_input, list);
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+
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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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+
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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 = to_usb_interface(hdev->dev.parent);
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+ int ret = hid_parse(hdev);
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+
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+ if (!ret)
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+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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+
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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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+
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+ return ret;
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+}
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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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+
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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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+
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+static int __init holtek_kbd_init(void)
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+{
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+ return hid_register_driver(&holtek_kbd_driver);
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+}
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+
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+static void __exit holtek_kbd_exit(void)
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+{
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+ hid_unregister_driver(&holtek_kbd_driver);
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+}
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+
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+module_exit(holtek_kbd_exit);
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+module_init(holtek_kbd_init);
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+MODULE_LICENSE("GPL");
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Tom Harwood