drivers/hid/hid-samsung.c

   1 /*
   2  *  HID driver for some samsung "special" devices
   3  *
   4  *  Copyright (c) 1999 Andreas Gal
   5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7  *  Copyright (c) 2006-2007 Jiri Kosina
   8  *  Copyright (c) 2007 Paul Walmsley
   9  *  Copyright (c) 2008 Jiri Slaby
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 2 of the License, or (at your option)
  16  * any later version.
  17  */
  18
  19 #include <linux/device.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22
  23 #include "hid-ids.h"
  24
  25 /*
  26  * Samsung IrDA remote controller (reports as Cypress USB Mouse).
  27  *
  28  * Vendor specific report #4 has a size of 48 bit,
  29  * and therefore is not accepted when inspecting the descriptors.
  30  * As a workaround we reinterpret the report as:
  31  *   Variable type, count 6, size 8 bit, log. maximum 255
  32  * The burden to reconstruct the data is moved into user space.
  33  */
  34 static void samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  35                 unsigned int rsize)
  36 {
  37         if (rsize >= 182 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&
  38                         rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
  39                         rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
  40                         rdesc[182] == 0x40) {
  41                 dev_info(&hdev->dev, "fixing up Samsung IrDA report "
  42                                 "descriptor\n");
  43                 rdesc[176] = 0xff;
  44                 rdesc[178] = 0x08;
  45                 rdesc[180] = 0x06;
  46                 rdesc[182] = 0x42;
  47         }
  48 }
  49
  50 static int samsung_probe(struct hid_device *hdev,
  51                 const struct hid_device_id *id)
  52 {
  53         int ret;
  54
  55         ret = hid_parse(hdev);
  56         if (ret) {
  57                 dev_err(&hdev->dev, "parse failed\n");
  58                 goto err_free;
  59         }
  60
  61         ret = hid_hw_start(hdev, (HID_CONNECT_DEFAULT & ~HID_CONNECT_HIDINPUT) |
  62                         HID_CONNECT_HIDDEV_FORCE);
  63         if (ret) {
  64                 dev_err(&hdev->dev, "hw start failed\n");
  65                 goto err_free;
  66         }
  67
  68         return 0;
  69 err_free:
  70         return ret;
  71 }
  72
  73 static const struct hid_device_id samsung_devices[] = {
  74         { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(hid, samsung_devices);
  78
  79 static struct hid_driver samsung_driver = {
  80         .name = "samsung",
  81         .id_table = samsung_devices,
  82         .report_fixup = samsung_report_fixup,
  83         .probe = samsung_probe,
  84 };
  85
  86 static int samsung_init(void)
  87 {
  88         return hid_register_driver(&samsung_driver);
  89 }
  90
  91 static void samsung_exit(void)
  92 {
  93         hid_unregister_driver(&samsung_driver);
  94 }
  95
  96 module_init(samsung_init);
  97 module_exit(samsung_exit);
  98 MODULE_LICENSE("GPL");