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Linux/drivers/hid/hid-ortek.c

  1 /*
  2  *  HID driver for various devices which are apparently based on the same chipset
  3  *  from certain vendor which produces chips that contain wrong LogicalMaximum
  4  *  value in their HID report descriptor. Currently supported devices are:
  5  *
  6  *    Ortek PKB-1700
  7  *    Ortek WKB-2000
  8  *    Skycable wireless presenter
  9  *
 10  *  Copyright (c) 2010 Johnathon Harris <jmharris@gmail.com>
 11  *  Copyright (c) 2011 Jiri Kosina
 12  */
 13 
 14 /*
 15  * This program is free software; you can redistribute it and/or modify it
 16  * under the terms of the GNU General Public License as published by the Free
 17  * Software Foundation; either version 2 of the License, or (at your option)
 18  * any later version.
 19  */
 20 
 21 #include <linux/device.h>
 22 #include <linux/hid.h>
 23 #include <linux/module.h>
 24 
 25 #include "hid-ids.h"
 26 
 27 static __u8 *ortek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 28                 unsigned int *rsize)
 29 {
 30         if (*rsize >= 56 && rdesc[54] == 0x25 && rdesc[55] == 0x01) {
 31                 hid_info(hdev, "Fixing up logical minimum in report descriptor (Ortek)\n");
 32                 rdesc[55] = 0x92;
 33         } else if (*rsize >= 54 && rdesc[52] == 0x25 && rdesc[53] == 0x01) {
 34                 hid_info(hdev, "Fixing up logical minimum in report descriptor (Skycable)\n");
 35                 rdesc[53] = 0x65;
 36         }
 37         return rdesc;
 38 }
 39 
 40 static const struct hid_device_id ortek_devices[] = {
 41         { HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_PKB1700) },
 42         { HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_WKB2000) },
 43         { HID_USB_DEVICE(USB_VENDOR_ID_SKYCABLE, USB_DEVICE_ID_SKYCABLE_WIRELESS_PRESENTER) },
 44         { }
 45 };
 46 MODULE_DEVICE_TABLE(hid, ortek_devices);
 47 
 48 static struct hid_driver ortek_driver = {
 49         .name = "ortek",
 50         .id_table = ortek_devices,
 51         .report_fixup = ortek_report_fixup
 52 };
 53 module_hid_driver(ortek_driver);
 54 
 55 MODULE_LICENSE("GPL");
 56 

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