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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_GET_ALT_IF 9F "Dec 29, 2006" .SH NAME usb_get_alt_if, usb_set_alt_if, usb_get_if_number, usb_owns_device \- Get and set alternate interface values .SH SYNOPSIS .nf #include \fBint\fR \fBusb_get_alt_if\fR(\fBdev_info_t *\fR\fIdip\fR, \fBuint_t\fR \fIinterface_number\fR, \fBuint_t *\fR\fIalternate_number\fR, \fBusb_flags_t\fR \fIflags\fR); .fi .LP .nf \fBint\fR \fBusb_set_alt_if\fR(\fBdev_info_t *\fR\fIdip\fR, \fBuint_t\fR \fIinterface_number\fR, \fBuint_t\fR \fIalternate_number\fR, \fBusb_flags_t\fR \fIflags\fR, \fBvoid (*\fR\fIcallback\fR)(usb_pipe_handle_t \fIpipe_handle\fR, \fBusb_opaque_t\fR \fIcallback_arg\fR, \fBint\fR \fIrval\fR, \fBusb_cb_flags_t\fR \fIflags\fR), \fBusb_opaque_t\fR \fIcallback_arg\fR); .fi .LP .nf \fB\fR \fBint\fR \fBusb_get_if_number\fR(\fBdev_info_t *\fR\fIdip\fR); .fi .LP .nf \fB\fR \fBboolean_t\fR \fBusb_owns_device\fR(\fBdev_info_t *\fR\fIdip\fR); .fi .SH INTERFACE LEVEL illumos DDI specific (illumos DDI) .SH PARAMETERS For \fBusb_get_alt_if()\fR: .sp .ne 2 .na \fB\fIdip\fR\fR .ad .RS 20n Pointer to device's \fBdev_info\fR structure. .RE .sp .ne 2 .na \fB\fIinterface_number\fR\fR .ad .RS 20n Interface of the desired alternate. .RE .sp .ne 2 .na \fB\fIalternate_number\fR\fR .ad .RS 20n Address where current alternate setting is returned. .RE .sp .ne 2 .na \fB\fIflags\fR\fR .ad .RS 20n No flags are recognized. Reserved for future expansion. .RE .sp .LP For \fBusb_set_alt_if()\fR: .sp .ne 2 .na \fB\fIdip\fR\fR .ad .RS 20n Pointer to device's \fBdev_info\fR structure. .RE .sp .ne 2 .na \fB\fIinterface_number\fR\fR .ad .RS 20n Interface of the desired alternate. .RE .sp .ne 2 .na \fB\fIalternate_number\fR\fR .ad .RS 20n Alternate interface number to be set. .RE .sp .ne 2 .na \fB\fIflags\fR\fR .ad .RS 20n Only USB_FLAGS_SLEEP is recognized. Wait for completion and do not call callback. .RE .sp .ne 2 .na \fB\fIcallback\fR\fR .ad .RS 20n Callback handler to notify of asynchronous completion. .RE .sp .ne 2 .na \fB\fIcallback_arg\fR\fR .ad .RS 20n Second argument passed to callback handler. .RE .sp .LP For \fBusb_get_if_number()\fR: .sp .ne 2 .na \fB\fIdip\fR\fR .ad .RS 7n Pointer to device's \fBdev_info\fR structure. .RE .sp .LP For \fBusb_owns_device()\fR: .sp .ne 2 .na \fB\fIdip\fR\fR .ad .RS 7n Pointer to device's \fBdev_info\fR structure. .RE .SH DESCRIPTION USB devices can have multiple configurations, each with many interfaces. Within interfaces are alternate settings, and within alternate settings are endpoints. .sp .LP Each interface within a configuration may be represented by the kernel as a device node. Only one set of device nodes (interfaces as determined by the configuration) can be active at one time. .sp .LP Alternates to an interface represent different ways the kernel sees a device node. Only one alternate setting within an interface can be active (or selected) at one time. The functions presented in this man page get or set interface or alternate setting information. .sp .LP The \fBusb_get_alt_if()\fR function requests the device to return the current alternate setting of the given interface. This function ignores the flags argument and always blocks. .sp .LP The \fBusb_set_alt_if()\fR function requests the device to set the interface and its alternate setting as specified. Because this call changes the current device's interface and sets the new interface's mode of operation as seen by the system, the driver must insure that all pipes other than the default control pipe are closed and quiescent. To avoid contending with another driver for a different part of the device, the driver must be bound to: the entire device, the interface-association which includes the alternative interface, or to the interface whose number is \fIinterface_number\fR. .sp .LP If \fBUSB_FLAGS_SLEEP\fR is set in flags, \fBusb_set_alt_if()\fR blocks until completed. Otherwise, \fBusb_set_alt_if()\fR returns immediately and calls the callback handler when completed. .sp .LP \fIcallback\fR is the asynchronous callback handler and takes the following arguments: .sp .ne 2 .na \fBusb_pipe_handle_t pipe_handle\fR .ad .sp .6 .RS 4n Handle of the default control pipe used to perform the request. .RE .sp .ne 2 .na \fBusb_opaque_t callback_arg\fR .ad .sp .6 .RS 4n Callback_arg specified to \fBusb_set_alt_if()\fR. .RE .sp .ne 2 .na \fBint rval\fR .ad .sp .6 .RS 4n Request status. .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 - Callback was uneventful. .sp USB_CB_ASYNC_REQ_FAILED - Error queueing request. .sp USB_CB_NO_RESOURCES - Error allocating resources. .RE .sp .LP The \fBusb_get_if_number()\fR function returns the interface number, or \fBUSB_COMBINED_NODE\fR or \fBUSB_DEVICE_NODE\fR node indicating that the driver is bound to the entire device. .sp .LP The \fBusb_owns_device()\fR function returns \fBB_TRUE\fR if the driver of the dip argument owns the entire device, or \fBB_FALSE\fR if it owns just a particular interface. .SH RETURN VALUES For \fBusb_get_alt_if()\fR: .sp .ne 2 .na \fBUSB_SUCCESS\fR .ad .RS 23n Interface's alternate setting was successfully obtained. .RE .sp .ne 2 .na \fBUSB_INVALID_ARGS\fR .ad .RS 23n Pointer to alternate_number and/or dip are NULL. .RE .sp .ne 2 .na \fBUSB_INVALID_CONTEXT\fR .ad .RS 23n Called from interrupt context. .RE .sp .ne 2 .na \fBUSB_FAILURE\fR .ad .RS 23n The interface number is invalid. .sp An access error occurred. .RE .sp .LP For \fBusb_set_alt_if()\fR: .sp .ne 2 .na \fBUSB_SUCCESS\fR .ad .RS 23n Alternate interface was successfully set. .RE .sp .ne 2 .na \fBUSB_INVALID_ARGS\fR .ad .RS 23n dip is NULL. USB_FLAGS_SLEEP is clear and callback is NULL. .RE .sp .ne 2 .na \fBUSB_INVALID_PERM\fR .ad .RS 23n dip does not own the interface to be set. .RE .sp .ne 2 .na \fBUSB_INVALID_CONTEXT\fR .ad .RS 23n Called from interrupt context with USB_FLAGS_SLEEP specified. .RE .sp .ne 2 .na \fBUSB_INVALID_PIPE\fR .ad .RS 23n Pipe handle is NULL, invalid, or refers to a pipe that is closing or closed. .RE .sp .ne 2 .na \fBUSB_FAILURE\fR .ad .RS 23n The interface number and/or alternate setting are invalid. .sp Pipes were open. .sp An access error occurred. .RE .sp .LP For \fBusb_get_if_number()\fR: .sp .LP \fBUSB_COMBINED_NODE\fR if the driver is responsible for the entire active device configuration. The \fBdip\fR doesn't correspond to an entire physical device. .sp .LP \fBUSB_DEVICE_NODE\fR if the driver is responsible for the entire device. The \fIdip\fR corresponds to an entire physical device. .sp .LP interface number: otherwise. .sp .LP For \fBusb_owns_device()\fR: .sp .ne 2 .na \fBB_TRUE\fR .ad .RS 11n Driver of the dip argument owns the entire device. .RE .sp .ne 2 .na \fBB_FALSE\fR .ad .RS 11n Driver of the dip argument owns only the current interface. .RE .SH CONTEXT The \fBusb_get_if_number()\fR and \fBusb_owns_device()\fR functions may be called from user or kernel context. .sp .LP The \fBusb_set_alt_if()\fR function may always be called from user or kernel context. It may be called from interrupt context only if \fBUSB_FLAGS_SLEEP\fR is not set in flags. If the \fBUSB_CB_ASYNC_REQ_FAILED\fR bit is clear in \fBusb_cb_flags_t\fR, the callback, if supplied, can block because it is executing in kernel context. Otherwise the callback cannot block. See \fBusb_callback_flags\fR(9S) for more information on callbacks. .sp .LP The \fBusb_get_alt_if()\fR function may be called from user or kernel context. .SH EXAMPLES .in +2 .nf /* Change alternate setting of interface 0. Wait for completion. */ if (usb_set_alt_if( dip, 0, new_alternate_setting_num, USB_FLAGS_SLEEP, NULL, 0) != USB_SUCCESS) { cmn_err (CE_WARN, "%s%d: Error setting alternate setting on pipe", ddi_driver_name(dip), ddi_get_instance(dip)); } } .fi .in -2 .SH ATTRIBUTES See \fBattributes\fR(7) 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 .BR attributes (7), .BR usb_get_cfg (9F), .BR usb_get_dev_data (9F), .BR usb_get_string_descr (9F), .BR usb_pipe_ctrl_xfer (9F)