diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-07 06:13:17 -0700 |
|---|---|---|
| committer | Marek Vasut <marek.vasut+renesas@gmail.com> | 2017-09-27 12:12:21 +0200 |
| commit | 3e59f59015e39ceb870fa8a7a12e0464e775512b (patch) | |
| tree | f03033b5635b7fa5ee51ced115ec7072fb56c82e | |
| parent | 7489d22a3c73b527c21c147f3547e8cc02484e47 (diff) | |
dm: usb: Add a new USB controller operation 'get_max_xfer_size'
The HCD may have limitation on the maximum bytes to be transferred
in a USB transfer. USB class driver needs to be aware of this.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
| -rw-r--r-- | drivers/usb/host/usb-uclass.c | 11 | ||||
| -rw-r--r-- | include/usb.h | 22 |
2 files changed, 32 insertions, 1 deletions
diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c index 0b8a501ce8..bc44fc3394 100644 --- a/drivers/usb/host/usb-uclass.c +++ b/drivers/usb/host/usb-uclass.c @@ -150,6 +150,17 @@ int usb_update_hub_device(struct usb_device *udev) return ops->update_hub_device(bus, udev); } +int usb_get_max_xfer_size(struct usb_device *udev, size_t *size) +{ + struct udevice *bus = udev->controller_dev; + struct dm_usb_ops *ops = usb_get_ops(bus); + + if (!ops->get_max_xfer_size) + return -ENOSYS; + + return ops->get_max_xfer_size(bus, size); +} + int usb_stop(void) { struct udevice *bus; diff --git a/include/usb.h b/include/usb.h index fad04016a3..0ddc0822b4 100644 --- a/include/usb.h +++ b/include/usb.h @@ -766,6 +766,14 @@ struct dm_usb_ops { * representation of this hub can be updated (xHCI) */ int (*update_hub_device)(struct udevice *bus, struct usb_device *udev); + + /** + * get_max_xfer_size() - Get HCD's maximum transfer bytes + * + * The HCD may have limitation on the maximum bytes to be transferred + * in a USB transfer. USB class driver needs to be aware of this. + */ + int (*get_max_xfer_size)(struct udevice *bus, size_t *size); }; #define usb_get_ops(dev) ((struct dm_usb_ops *)(dev)->driver->ops) @@ -939,7 +947,7 @@ int usb_new_device(struct usb_device *dev); int usb_alloc_device(struct usb_device *dev); /** - * update_hub_device() - Update HCD's internal representation of hub + * usb_update_hub_device() - Update HCD's internal representation of hub * * After a hub descriptor is fetched, notify HCD so that its internal * representation of this hub can be updated. @@ -950,6 +958,18 @@ int usb_alloc_device(struct usb_device *dev); int usb_update_hub_device(struct usb_device *dev); /** + * usb_get_max_xfer_size() - Get HCD's maximum transfer bytes + * + * The HCD may have limitation on the maximum bytes to be transferred + * in a USB transfer. USB class driver needs to be aware of this. + * + * @dev: USB device + * @size: maximum transfer bytes + * @return 0 if OK, -ve on error + */ +int usb_get_max_xfer_size(struct usb_device *dev, size_t *size); + +/** * usb_emul_setup_device() - Set up a new USB device emulation * * This is normally called when a new emulation device is bound. It tells |