The usbfs interface does not provide any way to get specific
superspeedplus rate, like Gen2x1, Gen1x2 or Gen2x2. Current
API include an USBDEVFS_GET_SPEED ioctl, but it can only return
general superspeedplus speed instead of any specific rates.
Therefore we can't tell whether it's a Gen2x2(20Gbps) device.
This patch introduce a new ioctl USBDEVFS_GET_SSP_RATE to fix
it. Similar information is already available via sysfs, it's
good to add it for usbfs too.
Signed-off-by: Dingyan Li <18500469033@xxxxxxx>
---
drivers/usb/core/devio.c | 3 +++
include/uapi/linux/usbdevice_fs.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 1a16a8bdea60..2f57eb163360 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -2783,6 +2783,9 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
case USBDEVFS_GET_SPEED:
ret = ps->dev->speed;
break;
+ case USBDEVFS_GET_SSP_RATE:
+ ret = ps->dev->ssp_rate;
+ break;
case USBDEVFS_FORBID_SUSPEND:
ret = proc_forbid_suspend(ps);
break;
diff --git a/include/uapi/linux/usbdevice_fs.h b/include/uapi/linux/usbdevice_fs.h
index 74a84e02422a..f5522e910329 100644
--- a/include/uapi/linux/usbdevice_fs.h
+++ b/include/uapi/linux/usbdevice_fs.h
@@ -227,5 +227,6 @@ struct usbdevfs_streams {
#define USBDEVFS_FORBID_SUSPEND _IO('U', 33)
#define USBDEVFS_ALLOW_SUSPEND _IO('U', 34)
#define USBDEVFS_WAIT_FOR_RESUME _IO('U', 35)
+#define USBDEVFS_GET_SSP_RATE _IO('U', 36)
#endif /* _UAPI_LINUX_USBDEVICE_FS_H */
--
2.25.1
