1 /* 2 * HID driver for ELECOM devices. 3 * Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com> 4 * Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com> 5 * Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu> 6 */ 7 8 /* 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the Free 11 * Software Foundation; either version 2 of the License, or (at your option) 12 * any later version. 13 */ 14 15 #include <linux/device.h> 16 #include <linux/hid.h> 17 #include <linux/module.h> 18 19 #include "hid-ids.h" 20 21 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, 22 unsigned int *rsize) 23 { 24 switch (hdev->product) { 25 case USB_DEVICE_ID_ELECOM_BM084: 26 /* The BM084 Bluetooth mouse includes a non-existing horizontal 27 * wheel in the HID descriptor. */ 28 if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) { 29 hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n"); 30 rdesc[47] = 0x00; 31 } 32 break; 33 case USB_DEVICE_ID_ELECOM_DEFT_WIRED: 34 case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS: 35 /* The DEFT trackball has eight buttons, but its descriptor only 36 * reports five, disabling the three Fn buttons on the top of 37 * the mouse. 38 * 39 * Apply the following diff to the descriptor: 40 * 41 * Collection (Physical), Collection (Physical), 42 * Report ID (1), Report ID (1), 43 * Report Count (5), -> Report Count (8), 44 * Report Size (1), Report Size (1), 45 * Usage Page (Button), Usage Page (Button), 46 * Usage Minimum (01h), Usage Minimum (01h), 47 * Usage Maximum (05h), -> Usage Maximum (08h), 48 * Logical Minimum (0), Logical Minimum (0), 49 * Logical Maximum (1), Logical Maximum (1), 50 * Input (Variable), Input (Variable), 51 * Report Count (1), -> Report Count (0), 52 * Report Size (3), Report Size (3), 53 * Input (Constant), Input (Constant), 54 * Report Size (16), Report Size (16), 55 * Report Count (2), Report Count (2), 56 * Usage Page (Desktop), Usage Page (Desktop), 57 * Usage (X), Usage (X), 58 * Usage (Y), Usage (Y), 59 * Logical Minimum (-32768), Logical Minimum (-32768), 60 * Logical Maximum (32767), Logical Maximum (32767), 61 * Input (Variable, Relative), Input (Variable, Relative), 62 * End Collection, End Collection, 63 */ 64 if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) { 65 hid_info(hdev, "Fixing up Elecom DEFT Fn buttons\n"); 66 rdesc[13] = 8; /* Button/Variable Report Count */ 67 rdesc[21] = 8; /* Button/Variable Usage Maximum */ 68 rdesc[29] = 0; /* Button/Constant Report Count */ 69 } 70 break; 71 } 72 return rdesc; 73 } 74 75 static const struct hid_device_id elecom_devices[] = { 76 { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) }, 77 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) }, 78 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) }, 79 { } 80 }; 81 MODULE_DEVICE_TABLE(hid, elecom_devices); 82 83 static struct hid_driver elecom_driver = { 84 .name = "elecom", 85 .id_table = elecom_devices, 86 .report_fixup = elecom_report_fixup 87 }; 88 module_hid_driver(elecom_driver); 89 90 MODULE_LICENSE("GPL"); 91