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127 lines
4.3 KiB
127 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* HID driver for ELECOM devices: |
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* - BM084 Bluetooth Mouse |
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* - EX-G Trackballs (M-XT3DRBK, M-XT3URBK, M-XT4DRBK) |
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* - DEFT Trackballs (M-DT1DRBK, M-DT1URBK, M-DT2DRBK, M-DT2URBK) |
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* - HUGE Trackballs (M-HT1DRBK, M-HT1URBK) |
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* |
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* Copyright (c) 2010 Richard Nauber <[email protected]> |
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* Copyright (c) 2016 Yuxuan Shui <[email protected]> |
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* Copyright (c) 2017 Diego Elio Pettenò <[email protected]> |
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* Copyright (c) 2017 Alex Manoussakis <[email protected]> |
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* Copyright (c) 2017 Tomasz Kramkowski <[email protected]> |
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* Copyright (c) 2020 YOSHIOKA Takuma <[email protected]> |
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*/ |
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/* |
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*/ |
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#include <linux/device.h> |
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#include <linux/hid.h> |
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#include <linux/module.h> |
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#include "hid-ids.h" |
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/* |
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* Certain ELECOM mice misreport their button count meaning that they only work |
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* correctly with the ELECOM mouse assistant software which is unavailable for |
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* Linux. A four extra INPUT reports and a FEATURE report are described by the |
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* report descriptor but it does not appear that these enable software to |
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* control what the extra buttons map to. The only simple and straightforward |
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* solution seems to involve fixing up the report descriptor. |
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*/ |
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#define MOUSE_BUTTONS_MAX 8 |
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static void mouse_button_fixup(struct hid_device *hdev, |
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__u8 *rdesc, unsigned int rsize, |
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unsigned int button_bit_count, |
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unsigned int padding_bit, |
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unsigned int button_report_size, |
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unsigned int button_usage_maximum, |
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int nbuttons) |
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{ |
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if (rsize < 32 || rdesc[button_bit_count] != 0x95 || |
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rdesc[button_report_size] != 0x75 || |
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rdesc[button_report_size + 1] != 0x01 || |
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rdesc[button_usage_maximum] != 0x29 || rdesc[padding_bit] != 0x75) |
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return; |
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hid_info(hdev, "Fixing up Elecom mouse button count\n"); |
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nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX); |
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rdesc[button_bit_count + 1] = nbuttons; |
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rdesc[button_usage_maximum + 1] = nbuttons; |
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rdesc[padding_bit + 1] = MOUSE_BUTTONS_MAX - nbuttons; |
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} |
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static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
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unsigned int *rsize) |
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{ |
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switch (hdev->product) { |
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case USB_DEVICE_ID_ELECOM_BM084: |
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/* The BM084 Bluetooth mouse includes a non-existing horizontal |
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* wheel in the HID descriptor. */ |
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if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) { |
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hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n"); |
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rdesc[47] = 0x00; |
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} |
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break; |
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case USB_DEVICE_ID_ELECOM_M_XGL20DLBK: |
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/* |
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* Report descriptor format: |
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* 20: button bit count |
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* 28: padding bit count |
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* 22: button report size |
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* 14: button usage maximum |
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*/ |
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mouse_button_fixup(hdev, rdesc, *rsize, 20, 28, 22, 14, 8); |
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break; |
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case USB_DEVICE_ID_ELECOM_M_XT3URBK: |
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case USB_DEVICE_ID_ELECOM_M_XT3DRBK: |
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case USB_DEVICE_ID_ELECOM_M_XT4DRBK: |
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/* |
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* Report descriptor format: |
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* 12: button bit count |
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* 30: padding bit count |
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* 14: button report size |
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* 20: button usage maximum |
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*/ |
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mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 6); |
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break; |
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case USB_DEVICE_ID_ELECOM_M_DT1URBK: |
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case USB_DEVICE_ID_ELECOM_M_DT1DRBK: |
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case USB_DEVICE_ID_ELECOM_M_HT1URBK: |
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case USB_DEVICE_ID_ELECOM_M_HT1DRBK: |
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/* |
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* Report descriptor format: |
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* 12: button bit count |
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* 30: padding bit count |
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* 14: button report size |
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* 20: button usage maximum |
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*/ |
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mouse_button_fixup(hdev, rdesc, *rsize, 12, 30, 14, 20, 8); |
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break; |
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} |
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return rdesc; |
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} |
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static const struct hid_device_id elecom_devices[] = { |
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{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XGL20DLBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1URBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1DRBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1URBK) }, |
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK) }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(hid, elecom_devices); |
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static struct hid_driver elecom_driver = { |
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.name = "elecom", |
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.id_table = elecom_devices, |
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.report_fixup = elecom_report_fixup |
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}; |
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module_hid_driver(elecom_driver); |
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MODULE_LICENSE("GPL");
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