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[usb] Add functions for manual device address assignment

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-03-16 15:37:39 +00:00
parent 74f57016dc
commit 838ab97ce3
2 changed files with 70 additions and 0 deletions
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26
src/include/ipxe/usb.h
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@@ -867,6 +867,17 @@ struct usb_bus {
/** Largest transfer allowed on the bus */
size_t mtu;
/** Address in-use mask
*
* This is used only by buses which perform manual address
* assignment. USB allows for addresses in the range [1,127].
* We use a simple bitmask which restricts us to the range
* [1,64]; this is unlikely to be a problem in practice. For
* comparison: controllers which perform autonomous address
* assignment (such as xHCI) typically allow for only 32
* devices per bus anyway.
*/
unsigned long long addresses;
/** Root hub */
struct usb_hub *hub;
@@ -1021,6 +1032,19 @@ usb_set_feature ( struct usb_device *usb, unsigned int type,
feature, index, NULL, 0 );
}
/**
* Set address
*
* @v usb USB device
* @v address Device address
* @ret rc Return status code
*/
static inline __attribute__ (( always_inline )) int
usb_set_address ( struct usb_device *usb, unsigned int address ) {
return usb_control ( usb, USB_SET_ADDRESS, address, 0, NULL, 0 );
}
/**
* Get USB descriptor
*
@@ -1148,6 +1172,8 @@ extern int register_usb_bus ( struct usb_bus *bus );
extern void unregister_usb_bus ( struct usb_bus *bus );
extern void free_usb_bus ( struct usb_bus *bus );
extern int usb_alloc_address ( struct usb_bus *bus );
extern void usb_free_address ( struct usb_bus *bus, unsigned int address );
extern unsigned int usb_route_string ( struct usb_device *usb );
extern unsigned int usb_depth ( struct usb_device *usb );
extern struct usb_port * usb_root_hub_port ( struct usb_device *usb );