Changeset 7e1b130 in mainline for uspace/lib/usbhost/include/usb/host/usb_device_manager.h

Timestamp:

2011-12-23T18:13:33Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3819ce5, b39eb79, f0b74b2

Parents:

2f0dd2a (diff), 153cc76a (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

USB branch changes.

+ USB device drivers use single async session to host controller, this session (represented by usb_hc_connection_t) is used for both HC requests and to back usb device connection.
+ Pipe locking was removed. Reference counting was moved to usb_hc_connection_t. Every read/write operation uses separate parallel exchange thus any contention is resolved on hc side.

• async_sess_t setup using EXCHANGE_PARALLEL uses one extra phone (session phone, each exch creates its own), thus the number of phones used by usb dvice driver might increase. Possible solutions are: make read/write calls atomic (all other calls are atomic) and use EXCHANGE_ATOMIC, any other solution provided by changes to async_sess_t.

File:

• uspace/lib/usbhost/include/usb/host/usb_device_manager.h (modified) (1 diff)

uspace/lib/usbhost/include/usb/host/usb_device_manager.h

@@ -59 +59 @@
                 devman_handle_t handle; /**< Devman handle of the device. */
         } devices[USB_ADDRESS_COUNT];
+        /** Maximum speed allowed. */
         usb_speed_t max_speed;
+        /** Protect access to members. */
         fibril_mutex_t guard;
         /** The last reserved address */