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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH USB_PIPE_RESET 9F "Jan 5, 2004" .SH NAME usb_pipe_reset \- Abort queued requests from a USB pipe and reset the pipe .SH SYNOPSIS .LP .nf #include <sys/usb/usba.h> \fBvoid\fR \fB\fR\fBusb_pipe_reset\fR(\fBdev_info_t *\fR\fIdip\fR, \fBusb_pipe_handle_t\fR \fIpipe_handle\fR, \fBusb_flags_t\fR \fIusb_flags\fR, \fBvoid (*\fR\fIcallback\fR)(usb_pipe_handle_t \fIcb_pipe_handle\fR, \fBusb_opaque_t\fR \fIarg\fR, \fBint\fR \fIrval\fR, \fBusb_cb_flags_t\fR \fIflags)\fR, \fBusb_opaque_t\fR \fIcallback_arg\fR); .fi .SH INTERFACE LEVEL .sp .LP Solaris DDI specific (Solaris DDI) .SH PARAMETERS .sp .ne 2 .na \fB\fIdip\fR\fR .ad .RS 16n Pointer to the device's \fBdev_info\fR structure. .RE .sp .ne 2 .na \fB\fIpipe_handle\fR\fR .ad .RS 16n Handle of the pipe to reset. Cannot be the handle to the default control pipe. .RE .sp .ne 2 .na \fB\fIusb_flags\fR\fR .ad .RS 16n USB_FLAGS_SLEEP is the only flag recognized. Wait for completion. .RE .sp .ne 2 .na \fB\fIcallback\fR\fR .ad .RS 16n Function called on completion if the USB_FLAGS_SLEEP flag is not specified. If NULL, no notification of completion is provided. .RE .sp .ne 2 .na \fB\fIcallback_arg\fR\fR .ad .RS 16n Second argument to callback function. .RE .SH DESCRIPTION .sp .LP Call \fBusb_pipe_reset()\fR to reset a pipe which is in an error state, or to abort a current request and clear the pipe. The \fBusb_pipe_reset()\fR function can be called on any pipe other than the default control pipe. .sp .LP A pipe can be reset automatically when requests sent to the pipe have the USB_ATTRS_AUTOCLEARING attribute specified. Client drivers see an exception callback with the USB_CB_STALL_CLEARED callback flag set in such cases. .sp .LP Stalls on pipes executing requests without the USB_ATTRS_AUTOCLEARING attribute set must be cleared by the client driver. The client driver is notified of the stall via an exception callback. The client driver must then call \fBusb_pipe_reset()\fR to clear the stall. .sp .LP The \fBusb_pipe_reset()\fR function resets a pipe as follows: .br .in +2 1. Any polling activity is stopped if the pipe being reset is an interrupt or isochronous pipe. .in -2 .br .in +2 2. All pending requests are removed from the pipe. An exception callback, if specified beforehand, is executed for each aborted request. .in -2 .br .in +2 3. The pipe is reset to the idle state. .in -2 .sp .LP Requests to reset the default control pipe are not allowed. No action is taken on a pipe which is closing. .sp .LP If USB_FLAGS_SLEEP is specified in \fIflags\fR, this function waits for the action to complete before calling the callback handler and returning. If not specified, this function queues the request and returns immediately, and the specified callback is called upon completion. .sp .LP \fIcallback\fR is the callback handler. It takes the following arguments: .sp .ne 2 .na \fBusb_pipe_handle_t cb_pipe_handle\fR .ad .sp .6 .RS 4n Handle of the pipe to reset. .RE .sp .ne 2 .na \fBusb_opaque_t callback_arg\fR .ad .sp .6 .RS 4n Callback_arg specified to \fBusb_pipe_reset()\fR. .RE .sp .ne 2 .na \fBint rval\fR .ad .sp .6 .RS 4n Return value of the reset call. .RE .sp .ne 2 .na \fBusb_cb_flags_t callback_flags\fR .ad .sp .6 .RS 4n Status of the queueing operation. Can be: .sp USB_CB_NO_INFO \(em Callback was uneventful. .sp USB_CB_ASYNC_REQ_FAILED \(em Error starting asynchronous request. .RE .SH RETURN VALUES .sp .LP Status is returned to the caller via the callback handler's rval argument. Possible callback hander rval argument values are: .sp .ne 2 .na \fBUSB_SUCCESS\fR .ad .RS 23n Pipe successfully reset. .RE .sp .ne 2 .na \fBUSB_INVALID_PIPE\fR .ad .RS 23n \fIpipe_handle\fR specifies a pipe which is closed or closing. .RE .sp .ne 2 .na \fBUSB_INVALID_ARGS\fR .ad .RS 23n \fIdip\fR or \fIpipe_handle\fR arguments are \fBNULL\fR. USB_FLAGS_SLEEP is clear and callback is NULL. .RE .sp .ne 2 .na \fBUSB_INVALID_CONTEXT\fR .ad .RS 23n Called from interrupt context with the USB_FLAGS_SLEEP flag set. .RE .sp .ne 2 .na \fBUSB_INVALID_PERM\fR .ad .RS 23n \fIpipe_handle\fR specifies the default control pipe. .RE .sp .ne 2 .na \fBUSB_FAILURE\fR .ad .RS 23n Asynchronous resources are unavailable. In this case, USB_CB_ASYNC_REQ_FAILED is passed in as the \fIcallback_flags\fR arg to the callback hander. .RE .sp .LP Exception callback handlers of interrupt-IN and isochronous-IN requests which are terminated by these commands are called with a completion reason of USB_CR_STOPPED_POLLING. .sp .LP Exception handlers of incomplete bulk requests are called with a completion reason of USB_CR_FLUSHED. .sp .LP Exception handlers of unstarted requests are called with USB_CR_PIPE_RESET. .sp .LP Note that messages mirroring the above errors are logged to the console logfile on error. This provides status for calls which could not otherwise provide status. .SH CONTEXT .sp .LP May be called from user or kernel context regardless of arguments. May be called from any callback with the USB_FLAGS_SLEEP clear. May not be called from a callback executing in interrupt context if the USB_FLAGS_SLEEP flag is set. .sp .LP If the USB_CB_ASYNC_REQ_FAILED bit is clear in usb_cb_flags_t, the callback, if supplied, can block because it is executing in kernel context. Otherwise the callback cannot block. Please see \fBusb_callback_flags\fR(9S) for more information on callbacks. .SH EXAMPLES .sp .in +2 .nf void post_reset_handler( usb_pipe_handle_t, usb_opaque_t, int, usb_cb_flags_t); /* * Do an asynchronous reset on bulk_pipe. * Execute post_reset_handler when done. */ usb_pipe_reset(dip, bulk_pipe, 0, post_reset_handler, arg); /* Do a synchronous reset on bulk_pipe. */ usb_pipe_reset(dip, bulk_pipe, USB_FLAGS_SLEEP, NULL, NULL); .fi .in -2 .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Architecture PCI-based systems _ Interface stability Committed .TE .SH SEE ALSO .sp .LP \fBattributes\fR(5), \fBusb_get_cfg\fR(9F), \fBusb_pipe_bulk_xfer\fR(9F), \fBusb_pipe_close\fR(9F), \fBusb_get_status\fR(9F), \fBusb_pipe_ctrl_xfer\fR(9F), \fBusb_pipe_drain_reqs\fR(9F), \fBusb_pipe_get_state\fR(9F), \fBusb_pipe_intr_xfer\fR(9F), \fBusb_pipe_isoc_xfer\fR(9F), \fBusb_pipe_open\fR(9F), \fBusb_pipe_stop_intr_polling\fR(9F), \fBusb_pipe_stop_isoc_polling\fR(9F), \fBusb_callback_flags\fR(9S)