arnavbhatt288/kolibrios
1
0
Fork 0
forked from KolibriOS/kolibrios
Code Pull Requests Activity

update documentation

Browse Source 
git-svn-id: svn://kolibrios.org@3577 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
CleverMouse 2013-05-30 14:00:40 +00:00
parent 70b7b47b34
commit f5abfdf5cc
1 changed files with 24 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
kernel/trunk/docs/usbapi.txt
View File

@ -4,8 +4,8 @@ configuration is always selected. The kernel also reads device descriptor to
print some information, reads and parses configuration descriptor. For every
interface the kernel looks for class code of this interface and loads the
corresponding COFF driver. Currently the correspondence is hardcoded into
the kernel code and looks as follows: 3 = usbhid.obj, 8 = usbstor.obj,
9 is handled by the kernel itself, other = usbother.obj.
the kernel code and looks as follows: 3 = usbhid.obj, 7 = usbprint.obj,
8 = usbstor.obj, 9 is handled by the kernel itself, other = usbother.obj.
The driver must be standard driver in COFF format, exporting procedure
named "START" and a variable named "version". Loader calls "START" procedure
@ -46,7 +46,7 @@ void* __stdcall AddDevice(
void* interfacedescr
);
The parameter 'controlpipe' is a handle of the control pipe for endpoint zero
The parameter 'pipe0' is a handle of the control pipe for endpoint zero
of the device. It can be used as the argument of USBControlTransferAsync.
The parameter 'configdescr' points to USB configuration descriptor
and all associated data, as returned by GET_DESCRIPTOR request.
@ -93,6 +93,19 @@ The parameter 'type' selects the type of the endpoint as defined by USB:
The parameter 'interval' is ignored for control and bulk endpoints.
For interrupt endpoints, it sets the polling interval in milliseconds.
The function returns a handle to the pipe or NULL on failure.
The output handle becomes invalid when a) it is explicitly closed with
the following function or b) the function DeviceDisconnected provided
by the driver returns.
void __stdcall USBClosePipe(
void* pipe
);
Releases all resources associated with the given pipe. The only parameter
must be a handle returned by USBOpenPipe.
When a device is disconnected, all associated pipes are closed by the kernel;
there is no need to ever call this function if all pipes are used continuously
while a device is connected.
void* __stdcall USBNormalTransferAsync(
void* pipe,
@ -104,7 +117,7 @@ void* __stdcall USBNormalTransferAsync(
);
void* __stdcall USBControlTransferAsync(
void* pipe,
void* config,
void* setup,
void* buffer,
int size,
void* callback,
@ -116,12 +129,12 @@ The first function inserts a bulk or interrupt transfer to the transfer queue
for given pipe. Type and direction of transfer are fixed for bulk and interrupt
endpoints and are set in USBOpenPipe. The second function inserts a control
transfer to the transfer queue for given pipe. Direction of a control transfer
is concluded from 'config' packet, bit 7 of byte 0 is set for IN transfers
is concluded from 'setup' packet, bit 7 of byte 0 is set for IN transfers
and cleared for OUT transfers. These function return immediately; when data
are transferred, the callback function will be called.
The parameter 'pipe' is a handle returned by USBOpenPipe.
The parameter 'config' of USBControlTransferAsync points to 8-byte
The parameter 'setup' of USBControlTransferAsync points to 8-byte
configuration packet as defined by USB.
The parameter 'buffer' is a pointer to buffer. For IN transfers, it will be
filled with the data. For OUT transfers, it should contain data to be
@ -174,10 +187,12 @@ USB_STATUS_BUFOVERRUN = 12 ; overflow of internal controller buffer
; possible only for isochronous transfers
USB_STATUS_BUFUNDERRUN = 13 ; underflow of internal controller buffer
; possible only for isochronous transfers
USB_STATUS_DISCONNECTED = 16 ; device disconnected
USB_STATUS_CLOSED = 16 ; pipe closed, either explicitly with USBClosePipe
; or due to device disconnect
If several transfers are queued for the same pipe, their callback functions
are called in the same order as they were queued.
When the device is disconnected, all callback functions are called
with USB_STATUS_DISCONNECTED. The call to DeviceDisconnected() occurs after
When a pipe is closed, either explicitly with USBClosePipe, or
implicitly due to device disconnect, all callback functions are called
with USB_STATUS_CLOSED. The call to DeviceDisconnected() occurs after
all callbacks.