USB_PIPE_CTRL_XFER(9F) Kernel Functions for Drivers USB_PIPE_CTRL_XFER(9F)
NAME
usb_pipe_ctrl_xfer, usb_pipe_ctrl_xfer_wait - USB control pipe transfer
functions
SYNOPSIS
#include <sys/usb/usba.h>
int usb_pipe_ctrl_xfer(
usb_pipe_handle_t pipe_handle,
usb_ctrl_req_t *request,
usb_flags_t flags);
int usb_pipe_ctrl_xfer_wait(
usb_pipe_handle_t pipe_handle,
usb_ctrl_setup_t *setup,
mblk_t **data,
usb_cr_t * completion_reason,
usb_cb_flags_t *cb_flags,
usb_flags_t flags);
INTERFACE LEVEL
illumos DDI specific (illumos DDI)
PARAMETERS
For
usb_pipe_ctrl_xfer():
pipe_handle Control pipe handle on which request is made.
request Pointer to control transfer request.
flags USB_FLAGS_SLEEP is the only flag recognized. Wait for all
pending request callbacks to complete.
For
usb_pipe_ctrl_xfer_wait():
pipe_handle Control pipe handle on which request is made.
setup Pointer to setup parameters. (See below.)
data Pointer to mblk containing data bytes to transfer
with command. Ignored if NULL.
completion_reason Returns overall completion status. Ignored if NULL.
Please see
usb_callback_flags(9S) for more
information.
callback_flags Returns flags set either during autoclearing or some
other callback, which indicate recovery handling
done in callback. Ignored if NULL.
flags No flags are recognized. Reserved for future
expansion.
DESCRIPTION
The
usb_pipe_ctrl_xfer() function requests the USBA framework to perform
a transfer through a USB control pipe. The request is passed to the host
controller driver (HCD), which performs the necessary transactions to
complete the request. Requests are synchronous when USB_FLAGS_SLEEP is
specified in flags; calls for synchronous requests do not return until
their transaction is completed. Asynchronous requests (made without
specifying the USB_FLAGS_SLEEP flag) notifies the caller of their
completion via a callback function.
The
usb_pipe_ctrl_xfer_wait() function is a wrapper around
usb_pipe_ctrl_xfer() that performs allocation and deallocation of all
required data structures, and a synchronous control-pipe transfer. It
takes a usb_ctrl_setup_t containing most usb setup parameters as an
argument:
uchar_t bmRequestType /* characteristics of request. */
/* (See USB 2.0 spec, section 9.3). */
/* Combine one direction of: */
/* USB_DEV_REQ_HOST_TO_DEV */
/* USB_DEV_REQ_DEV_TO_HOST */
/* with one request type of: */
/* USB_DEV_REQ_TYPE_STANDARD */
/* USB_DEV_REQ_TYPE_CLASS */
/* USB_DEV_REQ_TYPE_VENDOR */
/* with one recipient type of: */
/* USB_DEV_REQ_RCPT_DEV */
/* USB_DEV_REQ_RCPT_IF */
/* USB_DEV_REQ_RCPT_EP */
/* USB_DEV_REQ_RCPT_OTHER. */
uchar_t bRequest /* request or command. */
/* (See USB 2.0 spec, section */
/* 9.3 for standard commands.) */
uint16_t wValue /* value which varies according to */
/* the command (bRequest). */
uint16_t wIndex /* value which varies according to */
/* the command, typically used to */
/* pass an index or offset. */
uint16_t wLength /* number of data bytes to transfer */
/* with command, if any. Same as */
/* size of mblk "data" below. */
usb_req_attrs_t attrs; /* required request attributes */
Please see
usb_request_attributes(9S), or refer to Section
5.5 of the
USB 2.0 specification for more information on these parameters. (The USB 2.0
specification is available at
www.usb.org.)
Mblks for data are allocated optionally when a request is allocated via
usb_alloc_ctrl_req(9F) by passing a positive value for the
len argument.
Control requests passing or receiving no supplemental data need not
allocate an mblk.
RETURN VALUES
For
usb_pipe_ctrl_xfer():
USB_SUCCESS Transfer was successful.
USB_INVALID_ARGS Request is
NULL.
USB_INVALID_CONTEXT Called from interrupt context with the
USB_FLAGS_SLEEP flag set.
USB_INVALID_REQUEST The request has been freed or otherwise
invalidated.
A set of conflicting attributes were specified.
See
usb_request_attributes(9S).
The normal and/or exception callback is NULL and
USB_FLAGS_SLEEP is not set.
Data space not provided to a control request
while ctrl_wLength is nonzero.
USB_INVALID_PIPE Pipe handle is NULL or invalid.
Pipe is closing or closed.
USB_NO_RESOURCES Memory, descriptors or other resources
unavailable.
USB_HC_HARDWARE_ERROR Host controller is in error state.
USB_FAILURE An asynchronous transfer failed or an internal
error occurred.
The pipe is in an unsuitable state (error, busy,
not ready).
Additional status information may be available in the
ctrl_completion_reason and ctrl_cb_flags fields of the request. Please
see
usb_callback_flags(9S) and
usb_completion_reason(9S) for more
information.
For
usb_pipe_ctrl_xfer_wait():
USB_SUCCESS Request was successful.
USB_INVALID_CONTEXT Called from interrupt context.
USB_INVALID_ARGS dip is NULL.
Any error code returned by
usb_pipe_ctrl_xfer().
Additional status information may be available in the
ctrl_completion_reason and ctrl_cb_flags fields of the request. Please
see
usb_callback_flags(9S) and
usb_completion_reason(9S) for more
information.
CONTEXT
The
usb_pipe_ctrl_xfer() function may be called from kernel or user
context without regard to arguments and from the interrupt context only
when the USB_FLAGS_SLEEP flag is clear.
The
usb_pipe_ctrl_xfer_wait() function may be called from kernel or user
context.
EXAMPLES
/* Allocate, initialize and issue a synchronous control request. */
usb_ctrl_req_t ctrl_req;
void control_pipe_exception_callback(
usb_pipe_handle_t, usb_ctrl_req_t*);
ctrl_req = usb_alloc_ctrl_req(dip, 0, USB_FLAGS_SLEEP);
ctrl_req->ctrl_bmRequestType = USB_DEV_REQ_HOST_TO_DEV |
USB_DEV_REQ_TYPE_CLASS | USB_DEV_REQ_RCPT_OTHER;
ctrl_req->ctrl_bRequest = (uint8_t)USB_PRINTER_SOFT_RESET;
ctrl_req->ctrl_exc_cb = control_pipe_exception_callback;
...
...
if ((rval = usb_pipe_ctrl_xfer(pipe, ctrl_req, USB_FLAGS_SLEEP))
!= USB_SUCCESS) {
cmn_err (CE_WARN, "%s%d: Error issuing USB cmd.",
ddi_driver_name(dip), ddi_get_instance(dip));
}
-------
/*
* Allocate, initialize and issue an asynchronous control request to
* read a configuration descriptor.
*/
usb_ctrl_req_t *ctrl_req;
void control_pipe_normal_callback(
usb_pipe_handle_t, usb_ctrl_req_t*);
void control_pipe_exception_callback(
usb_pipe_handle_t, usb_ctrl_req_t*);
struct buf *bp = ...;
ctrl_req =
usb_alloc_ctrl_req(dip, sizeof(usb_cfg_descr_t), USB_FLAGS_SLEEP);
ctrl_req->ctrl_bmRequestType = USB_DEV_REQ_DEV_TO_HOST |
USB_DEV_REQ_TYPE_STANDARD | USB_DEV_REQ_RCPT_DEV;
ctrl_req->ctrl_wLength = sizeof(usb_cfg_descr_t);
ctrl_req->ctrl_wValue = USB_DESCR_TYPE_SETUP_CFG | 0;
ctrl_req->ctrl_bRequest = (uint8_t)USB_REQ_GET_DESCR;
ctrl_req->ctrl_cb = control_pipe_normal_callback;
ctrl_req->ctrl_exc_cb = control_pipe_exception_callback;
/* Make buf struct available to callback handler. */
ctrl_req->ctrl_client_private = (usb_opaque_t)bp;
...
...
if ((rval = usb_pipe_ctrl_xfer(pipe, ctrl_req, USB_FLAGS_NOSLEEP))
!= USB_SUCCESS) {
cmn_err (CE_WARN, "%s%d: Error issuing USB cmd.",
ddi_driver_name(dip), ddi_get_instance(dip));
}
-------
/* Call usb_pipe_ctrl_xfer_wait() to get device status. */
mblk_t *data;
usb_cr_t completion_reason;
usb_cb_flags_t callback_flags;
usb_ctrl_setup_t setup_params = {
USB_DEV_REQ_DEV_TO_HOST | /* bmRequestType */
USB_DEV_REQ_TYPE_STANDARD | USB_DEV_REQ_RCPT_DEV,
USB_REQ_GET_STATUS, /* bRequest */
0, /* wValue */
0, /* wIndex */
USB_GET_STATUS_LEN, /* wLength */
0 /* attributes. */
};
if (usb_pipe_ctrl_xfer_wait(
pipe,
&setup_params,
&data,
&compleetion_reason,
&callback_flags,
0) != USB_SUCCESS) {
cmn_err (CE_WARN,
"%s%d: USB get status command failed: "
"reason=%d callback_flags=0x%x",
ddi_driver_name(dip), ddi_get_instance(dip),
completion_reason, callback_flags);
return (EIO);
}
/* Check data length. Should be USB_GET_STATUS_LEN (2 bytes). */
length_returned = data->b_wptr - data->b_rptr;
if (length_returned != USB_GET_STATUS_LEN) {
cmn_err (CE_WARN,
"%s%d: USB get status command returned %d bytes of data.",
ddi_driver_name(dip), ddi_get_instance(dip), length_returned);
return (EIO);
}
/* Retrieve data in endian neutral way. */
status = (*(data->b_rptr + 1) << 8) | *(data->b_rptr);
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Architecture | PCI-based systems |
+--------------------+-------------------+
|Interface stability | Committed |
+--------------------+-------------------+
SEE ALSO
attributes(7),
usb_alloc_request(9F),
usb_get_cfg(9F),
usb_get_status(9F),
usb_pipe_bulk_xfer(9F),
usb_pipe_get_state(9F),
usb_pipe_intr_xfer(9F),
usb_pipe_isoc_xfer(9F),
usb_pipe_reset(9F),
usb_pipe_xopen(9F),
usb_bulk_request(9S),
usb_callback_flags(9S),
usb_completion_reason(9S),
usb_ctrl_request(9S),
usb_intr_request(9S),
usb_isoc_request(9S) September 16, 2016
USB_PIPE_CTRL_XFER(9F)