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usb: generic packet handler cleanup and documentation (Max Krasnyansky)

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A bit better documentation of the USB device API, namely
return codes.
Rewrite of usb_generic_handle_packet() to make it more
reable and easier to follow.

Signed-off-by: Max Krasnyansky <maxk@kernel.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5049 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-08-21 19:29:38 +00:00
parent 4b096fc9ec
commit 89b9b79f34
2 changed files with 183 additions and 125 deletions
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35
hw/usb.h
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@ -120,18 +120,49 @@ typedef struct USBPacket USBPacket;
/* definition of a USB device */
struct USBDevice {
void *opaque;
/*
* Process USB packet.
* Called by the HC (Host Controller).
*
* Returns length of the transaction
* or one of the USB_RET_XXX codes.
*/
int (*handle_packet)(USBDevice *dev, USBPacket *p);
/*
* Called when device is destroyed.
*/
void (*handle_destroy)(USBDevice *dev);
int speed;
/* The following fields are used by the generic USB device
layer. They are here just to avoid creating a new structure for
them. */
layer. They are here just to avoid creating a new structure
for them. */
/*
* Reset the device
*/
void (*handle_reset)(USBDevice *dev);
/*
* Process control request.
* Called from handle_packet().
*
* Returns length or one of the USB_RET_ codes.
*/
int (*handle_control)(USBDevice *dev, int request, int value,
int index, int length, uint8_t *data);
/*
* Process data transfers (both BULK and ISOC).
* Called from handle_packet().
*
* Returns length or one of the USB_RET_ codes.
*/
int (*handle_data)(USBDevice *dev, USBPacket *p);
uint8_t addr;
char devname[32];