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| author | Marcel Holtmann <marcel@holtmann.org> | 2019-12-04 04:41:09 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2019-12-11 15:31:52 +0100 |
| commit | 2f48865db3322f8e74f51ff93b91e5c2916dd259 (patch) | |
| tree | 1474f4e68c021e7aa3c1a5c1621e16a908c27ee6 | |
| parent | d004701d1cc5a036b1f2dec34dd5973064c72eab (diff) | |
| download | linux-2f48865db3322f8e74f51ff93b91e5c2916dd259.tar.gz linux-2f48865db3322f8e74f51ff93b91e5c2916dd259.tar.bz2 linux-2f48865db3322f8e74f51ff93b91e5c2916dd259.zip | |
HID: hidraw: add support uniq ioctl
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>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| -rw-r--r-- | drivers/hid/hidraw.c | 9 | ||||
| -rw-r--r-- | include/uapi/linux/hidraw.h | 1 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index c3fc0ceb8096..5dfe80208932 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 |