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"); 99 100 HID_COMPAT_LOAD_DRIVER(samsung); 101