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Date: Fri, 17 Sep 2021 16:42:49 +0200
From: Thomas Weißschuh <thomas@...ch.de>
To: Ilya Skriblovsky <ilyaskriblovsky@...il.com>
Cc: Jiri Kosina <jikos@...nel.org>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v2] Support for side buttons of Xiaomi Mi Dual Mode
Wireless Mouse Silent Edition
Hi,
On 2021-09-16T23:22+0300, Ilya Skriblovsky wrote:
> This patch enables side-buttons of Xiaomi Bluetooth mouse (specifically
> Xiaomi Mi Dual Mode Wireless Mouse Silent Edition).
>
> The mouse sends invalid button count in its HID Report Descriptor and
> this patch just replaces its descriptor with corrected one. With this
> driver side buttons work as expected acting like Back/Forward buttons.
>
> Signed-off-by: Ilya Skriblovsky <ilyaskriblovsky@...il.com>
> ---
> Changes since v1:
> - Fixed syntax of Kconfig
> ---
> drivers/hid/Kconfig | 7 +++
> drivers/hid/Makefile | 1 +
> drivers/hid/hid-xiaomi.c | 103 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 111 insertions(+)
> create mode 100644 drivers/hid/hid-xiaomi.c
>
> [..]
> diff --git a/drivers/hid/hid-xiaomi.c b/drivers/hid/hid-xiaomi.c
> new file mode 100644
> index 000000000000..56e8edd3d62f
> --- /dev/null
> +++ b/drivers/hid/hid-xiaomi.c
> @@ -0,0 +1,103 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * HID driver for Xiaomi Mi Dual Mode Wireless Mouse Silent Edition
> + *
> + * Copyright (c) 2021 Ilya Skriblovsky
> + */
> +
> +/*
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the Free
> + * Software Foundation; either version 2 of the License, or (at your option)
> + * any later version.
> + */
This license blurb is unnecessary.
FYI the SPDX-License-Identifier says GPL-2.0 (only!) but the blurb specifies "or
later".
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
linux/kernel.h should not be necessary.
> +#include <linux/hid.h>
> +
> +#define USB_VENDOR_ID_XIAOMI 0x2717
> +#define USB_DEVICE_ID_MI_SILENT_MOUSE 0x5014
These should go into drivers/hid/hid-ids.h.
> +
> +/* Fixed Mi Silent Mouse report descriptor */
> +/* Button's Usage Maximum changed from 3 to 5 to make side buttons work */
> +#define MI_SILENT_MOUSE_ORIG_RDESC_LENGTH 87
> +static __u8 mi_silent_mouse_rdesc_fixed[] = {
> + 0x05, 0x01, /* Usage Page (Desktop), */
> + 0x09, 0x02, /* Usage (Mouse), */
> + 0xA1, 0x01, /* Collection (Application), */
> + 0x85, 0x03, /* Report ID (3), */
> + 0x09, 0x01, /* Usage (Pointer), */
> + 0xA1, 0x00, /* Collection (Physical), */
> + 0x05, 0x09, /* Usage Page (Button), */
> + 0x19, 0x01, /* Usage Minimum (01h), */
> + 0x29, 0x05, /* X */ /* Usage Maximum (05h), */
> + 0x15, 0x00, /* Logical Minimum (0), */
> + 0x25, 0x01, /* Logical Maximum (1), */
> + 0x75, 0x01, /* Report Size (1), */
> + 0x95, 0x05, /* Report Count (5), */
> + 0x81, 0x02, /* Input (Variable), */
> + 0x75, 0x03, /* Report Size (3), */
> + 0x95, 0x01, /* Report Count (1), */
> + 0x81, 0x01, /* Input (Constant), */
> + 0x05, 0x01, /* Usage Page (Desktop), */
> + 0x09, 0x30, /* Usage (X), */
> + 0x09, 0x31, /* Usage (Y), */
> + 0x15, 0x81, /* Logical Minimum (-127), */
> + 0x25, 0x7F, /* Logical Maximum (127), */
> + 0x75, 0x08, /* Report Size (8), */
> + 0x95, 0x02, /* Report Count (2), */
> + 0x81, 0x06, /* Input (Variable, Relative), */
> + 0x09, 0x38, /* Usage (Wheel), */
> + 0x15, 0x81, /* Logical Minimum (-127), */
> + 0x25, 0x7F, /* Logical Maximum (127), */
> + 0x75, 0x08, /* Report Size (8), */
> + 0x95, 0x01, /* Report Count (1), */
> + 0x81, 0x06, /* Input (Variable, Relative), */
> + 0xC0, /* End Collection, */
> + 0xC0, /* End Collection, */
> + 0x06, 0x01, 0xFF, /* Usage Page (FF01h), */
> + 0x09, 0x01, /* Usage (01h), */
> + 0xA1, 0x01, /* Collection (Application), */
> + 0x85, 0x05, /* Report ID (5), */
> + 0x09, 0x05, /* Usage (05h), */
> + 0x15, 0x00, /* Logical Minimum (0), */
> + 0x26, 0xFF, 0x00, /* Logical Maximum (255), */
> + 0x75, 0x08, /* Report Size (8), */
> + 0x95, 0x04, /* Report Count (4), */
> + 0xB1, 0x02, /* Feature (Variable), */
> + 0xC0 /* End Collection */
> +};
> +
> +static __u8 *xiaomi_report_fixup(struct hid_device *hdev, __u8 *rdesc,
> + unsigned int *rsize)
> +{
> + switch (hdev->product) {
> + case USB_DEVICE_ID_MI_SILENT_MOUSE:
> + if (*rsize == MI_SILENT_MOUSE_ORIG_RDESC_LENGTH) {
> + hid_info(hdev, "fixing up Mi Silent Mouse report descriptor\n");
> + rdesc = mi_silent_mouse_rdesc_fixed;
> + *rsize = sizeof(mi_silent_mouse_rdesc_fixed);
> + }
> + break;
> + }
> + return rdesc;
> +}
> +
> +static const struct hid_device_id xiaomi_devices[] = {
> + { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_XIAOMI, USB_DEVICE_ID_MI_SILENT_MOUSE) },
> + { }
> +};
> +MODULE_DEVICE_TABLE(hid, xiaomi_devices);
> +
> +static struct hid_driver xiaomi_driver = {
> + .name = "xiaomi",
> + .id_table = xiaomi_devices,
> + .report_fixup = xiaomi_report_fixup,
> +};
> +module_hid_driver(xiaomi_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ilya Skriblovsky <IlyaSkriblovsky@...il.com>");
> +MODULE_DESCRIPTION("Fixing side buttons of Xiaomi Mi Silent Mouse");
> --
> 2.30.2
>
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