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  * There are several variants for 0419:0001:
  29  *
  30  * 1. 184 byte report descriptor
  31  * Vendor specific report #4 has a size of 48 bit,
  32  * and therefore is not accepted when inspecting the descriptors.
  33  * As a workaround we reinterpret the report as:
  34  *   Variable type, count 6, size 8 bit, log. maximum 255
  35  * The burden to reconstruct the data is moved into user space.
  36  *
  37  * 2. 203 byte report descriptor
  38  * Report #4 has an array field with logical range 0..18 instead of 1..15.
  39  *
  40  * 3. 135 byte report descriptor
  41  * Report #4 has an array field with logical range 0..17 instead of 1..14.
  42  *
  43  * 4. 171 byte report descriptor
  44  * Report #3 has an array field with logical range 0..1 instead of 1..3.
  45  */
  46 static inline void samsung_dev_trace(struct hid_device *hdev,
  47                 unsigned int rsize)
  48 {
  49         dev_info(&hdev->dev, "fixing up Samsung IrDA %d byte report "
  50                         "descriptor\n", rsize);
  51 }
  52
  53 static void samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  54                 unsigned int rsize)
  55 {
  56         if (rsize == 184 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&
  57                         rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
  58                         rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
  59                         rdesc[182] == 0x40) {
  60                 samsung_dev_trace(hdev, 184);
  61                 rdesc[176] = 0xff;
  62                 rdesc[178] = 0x08;
  63                 rdesc[180] = 0x06;
  64                 rdesc[182] = 0x42;
  65         } else
  66         if (rsize == 203 && rdesc[192] == 0x15 && rdesc[193] == 0x0 &&
  67                         rdesc[194] == 0x25 && rdesc[195] == 0x12) {
  68                 samsung_dev_trace(hdev, 203);
  69                 rdesc[193] = 0x1;
  70                 rdesc[195] = 0xf;
  71         } else
  72         if (rsize == 135 && rdesc[124] == 0x15 && rdesc[125] == 0x0 &&
  73                         rdesc[126] == 0x25 && rdesc[127] == 0x11) {
  74                 samsung_dev_trace(hdev, 135);
  75                 rdesc[125] = 0x1;
  76                 rdesc[127] = 0xe;
  77         } else
  78         if (rsize == 171 && rdesc[160] == 0x15 && rdesc[161] == 0x0 &&
  79                         rdesc[162] == 0x25 && rdesc[163] == 0x01) {
  80                 samsung_dev_trace(hdev, 171);
  81                 rdesc[161] = 0x1;
  82                 rdesc[163] = 0x3;
  83         }
  84 }
  85
  86 static int samsung_probe(struct hid_device *hdev,
  87                 const struct hid_device_id *id)
  88 {
  89         int ret;
  90         unsigned int cmask = HID_CONNECT_DEFAULT;
  91
  92         ret = hid_parse(hdev);
  93         if (ret) {
  94                 dev_err(&hdev->dev, "parse failed\n");
  95                 goto err_free;
  96         }
  97
  98         if (hdev->rsize == 184) {
  99                 /* disable hidinput, force hiddev */
 100                 cmask = (cmask & ~HID_CONNECT_HIDINPUT) |
 101                         HID_CONNECT_HIDDEV_FORCE;
 102         }
 103
 104         ret = hid_hw_start(hdev, cmask);
 105         if (ret) {
 106                 dev_err(&hdev->dev, "hw start failed\n");
 107                 goto err_free;
 108         }
 109
 110         return 0;
 111 err_free:
 112         return ret;
 113 }
 114
 115 static const struct hid_device_id samsung_devices[] = {
 116         { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
 117         { }
 118 };
 119 MODULE_DEVICE_TABLE(hid, samsung_devices);
 120
 121 static struct hid_driver samsung_driver = {
 122         .name = "samsung",
 123         .id_table = samsung_devices,
 124         .report_fixup = samsung_report_fixup,
 125         .probe = samsung_probe,
 126 };
 127
 128 static int __init samsung_init(void)
 129 {
 130         return hid_register_driver(&samsung_driver);
 131 }
 132
 133 static void __exit samsung_exit(void)
 134 {
 135         hid_unregister_driver(&samsung_driver);
 136 }
 137
 138 module_init(samsung_init);
 139 module_exit(samsung_exit);
 140 MODULE_LICENSE("GPL");