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usb_pipe_ctrl_xfer, usb_pipe_ctrl_xfer_wait - USB control pipe transfer functions

#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);

Solaris DDI specific (Solaris DDI)

For usb_pipe_ctrl_xfer(): pipe_handle

request flags

For usb_pipe_ctrl_xfer_wait(): pipe_handle

setup data completion_reason callback_flags flags

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.

For usb_pipe_ctrl_xfer(): USB_SUCCESS

USB_INVALID_ARGS USB_INVALID_CONTEXT USB_INVALID_REQUEST USB_INVALID_PIPE USB_NO_RESOURCES USB_HC_HARDWARE_ERROR USB_FAILURE

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

USB_INVALID_CONTEXT USB_INVALID_ARGS

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.

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.

 /* 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);

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Architecture PCI-based systems

Interface stability Committed

attributes(5), usb_alloc_request(9F), usb_get_cfg(9F), usb_get_status(9F), usb_pipe_bulk_xfer(9F), usb_pipe_intr_xfer(9F), usb_pipe_isoc_xfer(9F), usb_pipe_xopen(9F), usb_pipe_reset(9F), usb_pipe_get_state(9F), usb_bulk_request(9S), usb_callback_flags(9S), usb_ctrl_request(9S), usb_completion_reason(9S), usb_intr_request(9S), usb_isoc_request(9S)