usb_pipe_get_state - Return USB pipe state
#include <sys/usb/usba.h>
int usb_pipe_get_state(usb_pipe_handle_t pipe_handle,
usb_pipe_state_t *pipe_state, usb_flags_t usb_flags);
Solaris DDI specific (Solaris DDI)
Handle of the pipe to retrieve the state.
Pointer to where pipe state is returned.
No flags are recognized. Reserved for future expansion.
The usb_pipe_get_state() function retrieves the state of the pipe referred to by pipe_handle into the location pointed to by pipe_state.
Possible pipe states are:
Pipe is closed.
Pipe is active and can send/receive data. Polling is active for isochronous and interrupt pipes.
Polling is stopped for isochronous and interrupt-IN pipes.
An error occurred. Client must call usb_pipe_reset(). Note that this status is not seen by a client driver if USB_ATTRS_AUTOCLEARING is set in the request attributes.
Pipe is being closed. Requests are being drained from the pipe and other cleanup is in progress.
Pipe state returned in second argument.
Pipe_state argument is NULL.
Pipe_handle argument is NULL.
May be called from user, kernel or interrupt context.
usb_pipe_handle_t pipe;
usb_pipe_state_t state;
/* Recover if the pipe is in an error state. */
if ((usb_pipe_get_state(pipe, &state, 0) == USB_SUCCESS) &&
(state == USB_PIPE_STATE_ERROR)) {
cmn_err (CE_WARN, "%s%d: USB Pipe error.",
ddi_driver_name(dip), ddi_get_instance(dip));
do_recovery();
}
See attributes(5) for descriptions of the following attributes:
|
attributes(5), usb_clr_feature(9F), usb_get_cfg(9F). usb_get_status(9F), usb_pipe_close(9F), usb_pipe_ctrl_xfer(9F), usb_pipe_open(9F). usb_pipe_reset(9F)