diff options
Diffstat (limited to 'drivers/hid/hid-elecom.c')
| -rw-r--r-- | drivers/hid/hid-elecom.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/hid/hid-elecom.c b/drivers/hid/hid-elecom.c new file mode 100644 index 000000000..8c712d4bc --- /dev/null +++ b/drivers/hid/hid-elecom.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for ELECOM devices: + * - BM084 Bluetooth Mouse + * - EX-G Trackballs (M-XT3DRBK, M-XT3URBK, M-XT4DRBK) + * - DEFT Trackballs (M-DT1DRBK, M-DT1URBK, M-DT2DRBK, M-DT2URBK) + * - HUGE Trackballs (M-HT1DRBK, M-HT1URBK) + * + * Copyright (c) 2010 Richard Nauber <Richard.Nauber@gmail.com> + * Copyright (c) 2016 Yuxuan Shui <yshuiv7@gmail.com> + * Copyright (c) 2017 Diego Elio Pettenò <flameeyes@flameeyes.eu> + * Copyright (c) 2017 Alex Manoussakis <amanou@gnu.org> + * Copyright (c) 2017 Tomasz Kramkowski <tk@the-tk.com> + */ + +/* + */ + +#include <linux/device.h> +#include <linux/hid.h> +#include <linux/module.h> + +#include "hid-ids.h" + +/* + * Certain ELECOM mice misreport their button count meaning that they only work + * correctly with the ELECOM mouse assistant software which is unavailable for + * Linux. A four extra INPUT reports and a FEATURE report are described by the + * report descriptor but it does not appear that these enable software to + * control what the extra buttons map to. The only simple and straightforward + * solution seems to involve fixing up the report descriptor. + * + * Report descriptor format: + * Positions 13, 15, 21 and 31 store the button bit count, button usage minimum, + * button usage maximum and padding bit count respectively. + */ +#define MOUSE_BUTTONS_MAX 8 +static void mouse_button_fixup(struct hid_device *hdev, + __u8 *rdesc, unsigned int rsize, + int nbuttons) +{ + if (rsize < 32 || rdesc[12] != 0x95 || + rdesc[14] != 0x75 || rdesc[15] != 0x01 || + rdesc[20] != 0x29 || rdesc[30] != 0x75) + return; + hid_info(hdev, "Fixing up Elecom mouse button count\n"); + nbuttons = clamp(nbuttons, 0, MOUSE_BUTTONS_MAX); + rdesc[13] = nbuttons; + rdesc[21] = nbuttons; + rdesc[31] = MOUSE_BUTTONS_MAX - nbuttons; +} + +static __u8 *elecom_report_fixup(struct hid_device *hdev, __u8 *rdesc, + unsigned int *rsize) +{ + switch (hdev->product) { + case USB_DEVICE_ID_ELECOM_BM084: + /* The BM084 Bluetooth mouse includes a non-existing horizontal + * wheel in the HID descriptor. */ + if (*rsize >= 48 && rdesc[46] == 0x05 && rdesc[47] == 0x0c) { + hid_info(hdev, "Fixing up Elecom BM084 report descriptor\n"); + rdesc[47] = 0x00; + } + break; + case USB_DEVICE_ID_ELECOM_M_XT3URBK: + case USB_DEVICE_ID_ELECOM_M_XT3DRBK: + case USB_DEVICE_ID_ELECOM_M_XT4DRBK: + mouse_button_fixup(hdev, rdesc, *rsize, 6); + break; + case USB_DEVICE_ID_ELECOM_M_DT1URBK: + case USB_DEVICE_ID_ELECOM_M_DT1DRBK: + case USB_DEVICE_ID_ELECOM_M_HT1URBK: + case USB_DEVICE_ID_ELECOM_M_HT1DRBK: + mouse_button_fixup(hdev, rdesc, *rsize, 8); + break; + } + return rdesc; +} + +static const struct hid_device_id elecom_devices[] = { + { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3URBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT3DRBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_XT4DRBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1URBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_DT1DRBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1URBK) }, + { HID_USB_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_M_HT1DRBK) }, + { } +}; +MODULE_DEVICE_TABLE(hid, elecom_devices); + +static struct hid_driver elecom_driver = { + .name = "elecom", + .id_table = elecom_devices, + .report_fixup = elecom_report_fixup +}; +module_hid_driver(elecom_driver); + +MODULE_LICENSE("GPL"); |