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 * Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org> 7 */ 8 9 /* 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the Free 12 * Software Foundation; either version 2 of the License, or (at your option) 13 * any later version. 14 */ 15 16 #include <linux/device.h> 17 #include <linux/hid.h> 18 #include <linux/module.h> 19 20 #include "hid-ids.h" 21 22 static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, 23 unsigned int *rsize) 24 { 25 switch (hdev->product) { 26 case USB_DEVICE_ID_ELECOM_BM084: 27 /* The BM084 Bluetooth mouse includes a non-existing horizontal 28 * wheel in the HID descriptor. */ 29 if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) { 30 hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n"); 31 rdesc[47] = 0x00; 32 } 33 break; 34 case USB_DEVICE_ID_ELECOM_DEFT_WIRED: 35 case USB_DEVICE_ID_ELECOM_DEFT_WIRELESS: 36 case USB_DEVICE_ID_ELECOM_HUGE_WIRED: 37 case USB_DEVICE_ID_ELECOM_HUGE_WIRELESS: 38 /* The DEFT/HUGE trackball has eight buttons, but its descriptor 39 * only reports five, disabling the three Fn buttons on the top 40 * of the mouse. 41 * 42 * Apply the following diff to the descriptor: 43 * 44 * Collection (Physical), Collection (Physical), 45 * Report ID (1), Report ID (1), 46 * Report Count (5), -> Report Count (8), 47 * Report Size (1), Report Size (1), 48 * Usage Page (Button), Usage Page (Button), 49 * Usage Minimum (01h), Usage Minimum (01h), 50 * Usage Maximum (05h), -> Usage Maximum (08h), 51 * Logical Minimum (0), Logical Minimum (0), 52 * Logical Maximum (1), Logical Maximum (1), 53 * Input (Variable), Input (Variable), 54 * Report Count (1), -> Report Count (0), 55 * Report Size (3), Report Size (3), 56 * Input (Constant), Input (Constant), 57 * Report Size (16), Report Size (16), 58 * Report Count (2), Report Count (2), 59 * Usage Page (Desktop), Usage Page (Desktop), 60 * Usage (X), Usage (X), 61 * Usage (Y), Usage (Y), 62 * Logical Minimum (-32768), Logical Minimum (-32768), 63 * Logical Maximum (32767), Logical Maximum (32767), 64 * Input (Variable, Relative), Input (Variable, Relative), 65 * End Collection, End Collection, 66 */ 67 if (*rsize == 213 && rdesc[13] == 5 && rdesc[21] == 5) { 68 hid_info(hdev, "Fixing up Elecom DEFT/HUGE Fn buttons\n"); 69 rdesc[13] = 8; /* Button/Variable Report Count */ 70 rdesc[21] = 8; /* Button/Variable Usage Maximum */ 71 rdesc[29] = 0; /* Button/Constant Report Count */ 72 } 73 break; 74 } 75 return rdesc; 76 } 77 78 static const struct hid_device_id elecom_devices[] = { 79 { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) }, 80 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRED) }, 81 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_DEFT_WIRELESS) }, 82 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRED) }, 83 { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_HUGE_WIRELESS) }, 84 { } 85 }; 86 MODULE_DEVICE_TABLE(hid, elecom_devices); 87 88 static struct hid_driver elecom_driver = { 89 .name = "elecom", 90 .id_table = elecom_devices, 91 .report_fixup = elecom_report_fixup 92 }; 93 module_hid_driver(elecom_driver); 94 95 MODULE_LICENSE("GPL"); 96