linux-kernel - Re: [PATCH] HID: hidraw: add support uniq ioctl

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Date:   Wed, 11 Dec 2019 15:33:05 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Marcel Holtmann <marcel@...tmann.org>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        abhishekpandit@...omium.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: hidraw: add support uniq ioctl

On Wed, 4 Dec 2019, Marcel Holtmann wrote:

> Add support for reading out the uniq information from the underlying HID
> device. This might be the iSerialNumber in case of USB or the BD_ADDR in
> case of Bluetooth.
> 
> Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
> ---
>  drivers/hid/hidraw.c        | 9 +++++++++
>  include/uapi/linux/hidraw.h | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
> index bbc6ec1aa5cb..039304069fd0 100644
> --- a/drivers/hid/hidraw.c
> +++ b/drivers/hid/hidraw.c
> @@ -450,6 +450,15 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd,
>  						-EFAULT : len;
>  					break;
>  				}
> +
> +				if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) {
> +					int len = strlen(hid->uniq) + 1;
> +					if (len > _IOC_SIZE(cmd))
> +						len = _IOC_SIZE(cmd);
> +					ret = copy_to_user(user_arg, hid->uniq, len) ?
> +						-EFAULT : len;
> +					break;
> +				}

Queued for 5.6. Thanks,

-- 
Jiri Kosina
SUSE Labs