* [PATCH] HID: hidraw: add support uniq ioctl
@ 2019-12-04 3:41 Marcel Holtmann
2019-12-11 14:33 ` Jiri Kosina
0 siblings, 1 reply; 2+ messages in thread
From: Marcel Holtmann @ 2019-12-04 3:41 UTC (permalink / raw)
To: Jiri Kosina, Benjamin Tissoires; +Cc: abhishekpandit, linux-input, linux-kernel
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@holtmann.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;
+ }
}
ret = -ENOTTY;
diff --git a/include/uapi/linux/hidraw.h b/include/uapi/linux/hidraw.h
index 98e2c493de85..4913539e5bcc 100644
--- a/include/uapi/linux/hidraw.h
+++ b/include/uapi/linux/hidraw.h
@@ -39,6 +39,7 @@ struct hidraw_devinfo {
/* The first byte of SFEATURE and GFEATURE is the report number */
#define HIDIOCSFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)
#define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)
+#define HIDIOCGRAWUNIQ(len) _IOC(_IOC_READ, 'H', 0x08, len)
#define HIDRAW_FIRST_MINOR 0
#define HIDRAW_MAX_DEVICES 64
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] HID: hidraw: add support uniq ioctl
2019-12-04 3:41 [PATCH] HID: hidraw: add support uniq ioctl Marcel Holtmann
@ 2019-12-11 14:33 ` Jiri Kosina
0 siblings, 0 replies; 2+ messages in thread
From: Jiri Kosina @ 2019-12-11 14:33 UTC (permalink / raw)
To: Marcel Holtmann
Cc: Benjamin Tissoires, abhishekpandit, linux-input, linux-kernel
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@holtmann.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
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