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 static void samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc, 44 unsigned int rsize) 45 { 46 if (rsize == 184 && rdesc[175] == 0x25 && rdesc[176] == 0x40 && 47 rdesc[177] == 0x75 && rdesc[178] == 0x30 && 48 rdesc[179] == 0x95 && rdesc[180] == 0x01 && 49 rdesc[182] == 0x40) { 50 dev_info(&hdev->dev, "fixing up Samsung IrDA %d byte report " 51 "descriptor\n", 184); 52 rdesc[176] = 0xff; 53 rdesc[178] = 0x08; 54 rdesc[180] = 0x06; 55 rdesc[182] = 0x42; 56 } else 57 if (rsize == 203 && rdesc[192] == 0x15 && rdesc[193] == 0x0 && 58 rdesc[194] == 0x25 && rdesc[195] == 0x12) { 59 dev_info(&hdev->dev, "fixing up Samsung IrDA %d byte report " 60 "descriptor\n", 203); 61 rdesc[193] = 0x1; 62 rdesc[195] = 0xf; 63 } else 64 if (rsize == 135 && rdesc[124] == 0x15 && rdesc[125] == 0x0 && 65 rdesc[126] == 0x25 && rdesc[127] == 0x11) { 66 dev_info(&hdev->dev, "fixing up Samsung IrDA %d byte report " 67 "descriptor\n", 135); 68 rdesc[125] = 0x1; 69 rdesc[127] = 0xe; 70 } 71 } 72 73 static int samsung_probe(struct hid_device *hdev, 74 const struct hid_device_id *id) 75 { 76 int ret; 77 unsigned int cmask = HID_CONNECT_DEFAULT; 78 79 ret = hid_parse(hdev); 80 if (ret) { 81 dev_err(&hdev->dev, "parse failed\n"); 82 goto err_free; 83 } 84 85 if (hdev->rsize == 184) { 86 /* disable hidinput, force hiddev */ 87 cmask = (cmask & ~HID_CONNECT_HIDINPUT) | 88 HID_CONNECT_HIDDEV_FORCE; 89 } 90 91 ret = hid_hw_start(hdev, cmask); 92 if (ret) { 93 dev_err(&hdev->dev, "hw start failed\n"); 94 goto err_free; 95 } 96 97 return 0; 98 err_free: 99 return ret; 100 } 101 102 static const struct hid_device_id samsung_devices[] = { 103 { HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) }, 104 { } 105 }; 106 MODULE_DEVICE_TABLE(hid, samsung_devices); 107 108 static struct hid_driver samsung_driver = { 109 .name = "samsung", 110 .id_table = samsung_devices, 111 .report_fixup = samsung_report_fixup, 112 .probe = samsung_probe, 113 }; 114 115 static int __init samsung_init(void) 116 { 117 return hid_register_driver(&samsung_driver); 118 } 119 120 static void __exit samsung_exit(void) 121 { 122 hid_unregister_driver(&samsung_driver); 123 } 124 125 module_init(samsung_init); 126 module_exit(samsung_exit); 127 MODULE_LICENSE("GPL"); 128