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dm: usb: Add a new USB controller operation 'get_max_xfer_size'

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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>
This commit is contained in:
Bin Meng 2017-09-07 06:13:17 -07:00 • committed by Marek Vasut
parent 7489d22a3c
commit 3e59f59015
2 changed files with 32 additions and 1 deletions
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11
drivers/usb/host/usb-uclass.c
View file

@ -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;

22
include/usb.h
View file

@ -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.
@ -949,6 +957,18 @@ 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
*