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3bb00f61a2
Instead, we want busses to explicitly specify an add_child routine if they want to support identify routines, but by default disallow having outside drivers add devices. - Give smbus(4) an explicit bus_add_child() method. Requested by: imp
543 lines
16 KiB
Objective-C
543 lines
16 KiB
Objective-C
#-
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# Copyright (c) 1998-2004 Doug Rabson
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/bus.h>
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/**
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* @defgroup BUS bus - KObj methods for drivers of devices with children
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* @brief A set of methods required device drivers that support
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* child devices.
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* @{
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*/
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INTERFACE bus;
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#
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# Default implementations of some methods.
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#
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CODE {
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static struct resource *
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null_alloc_resource(device_t dev, device_t child,
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int type, int *rid, u_long start, u_long end,
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u_long count, u_int flags)
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{
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return (0);
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}
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};
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/**
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* @brief Print a description of a child device
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*
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* This is called from system code which prints out a description of a
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* device. It should describe the attachment that the child has with
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* the parent. For instance the TurboLaser bus prints which node the
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* device is attached to. See bus_generic_print_child() for more
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* information.
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*
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* @param _dev the device whose child is being printed
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* @param _child the child device to describe
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*
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* @returns the number of characters output.
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*/
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METHOD int print_child {
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device_t _dev;
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device_t _child;
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} DEFAULT bus_generic_print_child;
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/**
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* @brief Print a notification about an unprobed child device.
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*
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* Called for each child device that did not succeed in probing for a
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* driver.
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*
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* @param _dev the device whose child was being probed
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* @param _child the child device which failed to probe
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*/
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METHOD void probe_nomatch {
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device_t _dev;
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device_t _child;
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};
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/**
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* @brief Read the value of a bus-specific attribute of a device
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*
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* This method, along with BUS_WRITE_IVAR() manages a bus-specific set
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* of instance variables of a child device. The intention is that
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* each different type of bus defines a set of appropriate instance
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* variables (such as ports and irqs for ISA bus etc.)
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*
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* This information could be given to the child device as a struct but
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* that makes it hard for a bus to add or remove variables without
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* forcing an edit and recompile for all drivers which may not be
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* possible for vendor supplied binary drivers.
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*
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* This method copies the value of an instance variable to the
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* location specified by @p *_result.
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*
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* @param _dev the device whose child was being examined
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* @param _child the child device whose instance variable is
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* being read
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* @param _index the instance variable to read
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* @param _result a loction to recieve the instance variable
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* value
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*
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* @retval 0 success
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* @retval ENOENT no such instance variable is supported by @p
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* _dev
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*/
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METHOD int read_ivar {
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device_t _dev;
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device_t _child;
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int _index;
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uintptr_t *_result;
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};
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/**
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* @brief Write the value of a bus-specific attribute of a device
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*
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* This method sets the value of an instance variable to @p _value.
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*
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* @param _dev the device whose child was being updated
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* @param _child the child device whose instance variable is
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* being written
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* @param _index the instance variable to write
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* @param _value the value to write to that instance variable
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*
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* @retval 0 success
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* @retval ENOENT no such instance variable is supported by @p
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* _dev
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* @retval EINVAL the instance variable was recognised but
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* contains a read-only value
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*/
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METHOD int write_ivar {
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device_t _dev;
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device_t _child;
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int _indx;
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uintptr_t _value;
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};
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/**
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* @brief Notify a bus that a child was detached
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*
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* Called after the child's DEVICE_DETACH() method to allow the parent
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* to reclaim any resources allocated on behalf of the child.
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*
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* @param _dev the device whose child changed state
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* @param _child the child device which changed state
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*/
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METHOD void child_detached {
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device_t _dev;
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device_t _child;
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};
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/**
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* @brief Notify a bus that a new driver was added
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*
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* Called when a new driver is added to the devclass which owns this
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* bus. The generic implementation of this method attempts to probe and
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* attach any un-matched children of the bus.
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*
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* @param _dev the device whose devclass had a new driver
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* added to it
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* @param _driver the new driver which was added
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*/
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METHOD void driver_added {
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device_t _dev;
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driver_t *_driver;
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} DEFAULT bus_generic_driver_added;
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/**
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* @brief Create a new child device
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*
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* For busses which use use drivers supporting DEVICE_IDENTIFY() to
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* enumerate their devices, this method is used to create new
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* device instances. The new device will be added after the last
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* existing child with the same order.
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*
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* @param _dev the bus device which will be the parent of the
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* new child device
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* @param _order a value which is used to partially sort the
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* children of @p _dev - devices created using
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* lower values of @p _order appear first in @p
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* _dev's list of children
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* @param _name devclass name for new device or @c NULL if not
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* specified
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* @param _unit unit number for new device or @c -1 if not
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* specified
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*/
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METHOD device_t add_child {
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device_t _dev;
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int _order;
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const char *_name;
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int _unit;
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};
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/**
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* @brief Allocate a system resource
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*
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* This method is called by child devices of a bus to allocate resources.
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* The types are defined in <machine/resource.h>; the meaning of the
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* resource-ID field varies from bus to bus (but @p *rid == 0 is always
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* valid if the resource type is). If a resource was allocated and the
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* caller did not use the RF_ACTIVE to specify that it should be
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* activated immediately, the caller is responsible for calling
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* BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which is requesting an allocation
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* @param _type the type of resource to allocate
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* @param _rid a pointer to the resource identifier
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* @param _start hint at the start of the resource range - pass
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* @c 0UL for any start address
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* @param _end hint at the end of the resource range - pass
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* @c ~0UL for any end address
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* @param _count hint at the size of range required - pass @c 1
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* for any size
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* @param _flags any extra flags to control the resource
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* allocation - see @c RF_XXX flags in
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* <sys/rman.h> for details
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*
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* @returns the resource which was allocated or @c NULL if no
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* resource could be allocated
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*/
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METHOD struct resource * alloc_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int *_rid;
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u_long _start;
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u_long _end;
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u_long _count;
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u_int _flags;
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} DEFAULT null_alloc_resource;
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/**
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* @brief Activate a resource
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*
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* Activate a resource previously allocated with
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* BUS_ALLOC_RESOURCE(). This may for instance map a memory region
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* into the kernel's virtual address space.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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* @param _r the resource to activate
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*/
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METHOD int activate_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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struct resource *_r;
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};
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/**
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* @brief Deactivate a resource
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*
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* Deactivate a resource previously allocated with
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* BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region
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* from the kernel's virtual address space.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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* @param _r the resource to deactivate
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*/
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METHOD int deactivate_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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struct resource *_r;
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};
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/**
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* @brief Release a resource
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*
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* Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
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* value must be the same as the one returned by BUS_ALLOC_RESOURCE()
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* (which is not necessarily the same as the one the client passed).
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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* @param _r the resource to release
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*/
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METHOD int release_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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struct resource *_res;
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};
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/**
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* @brief Install an interrupt handler
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*
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* This method is used to associate an interrupt handler function with
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* an irq resource. When the interrupt triggers, the function @p _intr
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* will be called with the value of @p _arg as its single
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* argument. The value returned in @p *_cookiep is used to cancel the
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* interrupt handler - the caller should save this value to use in a
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* future call to BUS_TEARDOWN_INTR().
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _irq the resource representing the interrupt
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* @param _flags a set of bits from enum intr_type specifying
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* the class of interrupt
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* @param _intr the function to call when the interrupt
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* triggers
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* @param _arg a value to use as the single argument in calls
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* to @p _intr
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* @param _cookiep a pointer to a location to recieve a cookie
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* value that may be used to remove the interrupt
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* handler
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*/
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METHOD int setup_intr {
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device_t _dev;
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device_t _child;
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struct resource *_irq;
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int _flags;
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driver_intr_t *_intr;
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void *_arg;
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void **_cookiep;
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};
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/**
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* @brief Uninstall an interrupt handler
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*
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* This method is used to disassociate an interrupt handler function
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* with an irq resource. The value of @p _cookie must be the value
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* returned from a previous call to BUS_SETUP_INTR().
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which allocated the resource
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* @param _irq the resource representing the interrupt
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* @param _cookie the cookie value returned when the interrupt
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* was originally registered
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*/
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METHOD int teardown_intr {
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device_t _dev;
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device_t _child;
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struct resource *_irq;
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void *_cookie;
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};
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/**
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* @brief Define a resource which can be allocated with
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* BUS_ALLOC_RESOURCE().
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*
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* This method is used by some busses (typically ISA) to allow a
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* driver to describe a resource range that it would like to
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* allocate. The resource defined by @p _type and @p _rid is defined
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* to start at @p _start and to include @p _count indices in its
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* range.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which owns the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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* @param _start the start of the resource range
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* @param _count the size of the resource range
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*/
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METHOD int set_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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u_long _start;
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u_long _count;
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};
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/**
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* @brief Describe a resource
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*
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* This method allows a driver to examine the range used for a given
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* resource without actually allocating it.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which owns the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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* @param _start the address of a location to recieve the start
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* index of the resource range
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* @param _count the address of a location to recieve the size
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* of the resource range
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*/
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METHOD int get_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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u_long *_startp;
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u_long *_countp;
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};
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/**
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* @brief Delete a resource.
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*
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* Use this to delete a resource (possibly one previously added with
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* BUS_SET_RESOURCE()).
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which owns the resource
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* @param _type the type of resource
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* @param _rid the resource identifier
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*/
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METHOD void delete_resource {
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device_t _dev;
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device_t _child;
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int _type;
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int _rid;
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};
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/**
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* @brief Return a struct resource_list.
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*
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* Used by drivers which use bus_generic_rl_alloc_resource() etc. to
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* implement their resource handling. It should return the resource
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* list of the given child device.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which owns the resource list
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*/
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METHOD struct resource_list * get_resource_list {
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device_t _dev;
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device_t _child;
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} DEFAULT bus_generic_get_resource_list;
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/**
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* @brief Is the hardware described by @p _child still attached to the
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* system?
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*
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* This method should return 0 if the device is not present. It
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* should return -1 if it is present. Any errors in determining
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* should be returned as a normal errno value. Client drivers are to
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* assume that the device is present, even if there is an error
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* determining if it is there. Busses are to try to avoid returning
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* errors, but newcard will return an error if the device fails to
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* implement this method.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which is being examined
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*/
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METHOD int child_present {
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device_t _dev;
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device_t _child;
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} DEFAULT bus_generic_child_present;
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/**
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* @brief Returns the pnp info for this device.
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*
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* Return it as a string. If the string is insufficient for the
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* storage, then return EOVERFLOW.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which is being examined
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* @param _buf the address of a buffer to receive the pnp
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* string
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* @param _buflen the size of the buffer pointed to by @p _buf
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*/
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METHOD int child_pnpinfo_str {
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device_t _dev;
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device_t _child;
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char *_buf;
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size_t _buflen;
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};
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/**
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* @brief Returns the location for this device.
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*
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* Return it as a string. If the string is insufficient for the
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* storage, then return EOVERFLOW.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device which is being examined
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* @param _buf the address of a buffer to receive the location
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* string
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* @param _buflen the size of the buffer pointed to by @p _buf
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*/
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METHOD int child_location_str {
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device_t _dev;
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device_t _child;
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char *_buf;
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size_t _buflen;
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};
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/**
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* @brief Allow (bus) drivers to specify the trigger mode and polarity
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* of the specified interrupt.
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*
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* @param _dev the bus device
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* @param _irq the interrupt number to modify
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* @param _trig the trigger mode required
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* @param _pol the interrupt polarity required
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*/
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METHOD int config_intr {
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device_t _dev;
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int _irq;
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enum intr_trigger _trig;
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enum intr_polarity _pol;
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} DEFAULT bus_generic_config_intr;
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/**
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* @brief Notify a (bus) driver about a child that the hints mechanism
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* believes it has discovered.
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*
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* The bus is responsible for then adding the child in the right order
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* and discovering other things about the child. The bus driver is
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* free to ignore this hint, to do special things, etc. It is all up
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* to the bus driver to interpret.
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*
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* This method is only called in response to the parent bus asking for
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* hinted devices to be enumerated.
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*
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* @param _dev the bus device
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* @param _dname the name of the device w/o unit numbers
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* @param _dunit the unit number of the device
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*/
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METHOD void hinted_child {
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device_t _dev;
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const char * _dname;
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int _dunit;
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};
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/**
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* @brief Returns bus_dma_tag_t for use w/ devices on the bus.
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*
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* @param _dev the parent device of @p _child
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* @param _child the device to which the tag will belong
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*/
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METHOD bus_dma_tag_t get_dma_tag {
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device_t _dev;
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device_t _child;
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} DEFAULT bus_generic_get_dma_tag;
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