af21235ac4
now the preferred typical return value from a probe routine. Discourage the use of 0 (BUS_PROBE_SPECIFIC) as it should be used very rarely. Point the reader to the DEVICE_PROBE(9) manpage for more detailed notes on possible probe return values. Submitted by: Philip Soeberg philip-dev of soeberg net
319 lines
9.6 KiB
Objective-C
319 lines
9.6 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 DEVICE device - KObj methods for all device drivers
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* @brief A basic set of methods required for all device drivers.
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*
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* The device interface is used to match devices to drivers during
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* autoconfiguration and provides methods to allow drivers to handle
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* system-wide events such as suspend, resume or shutdown.
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* @{
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*/
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INTERFACE device;
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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 int null_shutdown(device_t dev)
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{
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return 0;
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}
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static int null_suspend(device_t dev)
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{
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return 0;
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}
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static int null_resume(device_t dev)
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{
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return 0;
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}
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static int null_quiesce(device_t dev)
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{
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return EOPNOTSUPP;
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}
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};
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/**
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* @brief Probe to see if a device matches a driver.
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*
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* Users should not call this method directly. Normally, this
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* is called via device_probe_and_attach() to select a driver
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* calling the DEVICE_PROBE() of all candidate drivers and attach
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* the winning driver (if any) to the device.
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*
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* This function is used to match devices to device drivers.
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* Typically, the driver will examine the device to see if
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* it is suitable for this driver. This might include checking
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* the values of various device instance variables or reading
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* hardware registers.
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*
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* In some cases, there may be more than one driver available
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* which can be used for a device (for instance there might
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* be a generic driver which works for a set of many types of
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* device and a more specific driver which works for a subset
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* of devices). Because of this, a driver should not assume
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* that it will be the driver that attaches to the device even
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* if it returns a success status from DEVICE_PROBE(). In particular,
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* a driver must free any resources which it allocated during
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* the probe before returning. The return value of DEVICE_PROBE()
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* is used to elect which driver is used - the driver which returns
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* the largest non-error value wins the election and attaches to
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* the device. Common non-error values are described in the
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* DEVICE_PROBE(9) manual page.
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*
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* If a driver matches the hardware, it should set the device
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* description string using device_set_desc() or
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* device_set_desc_copy(). This string is used to generate an
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* informative message when DEVICE_ATTACH() is called.
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*
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* As a special case, if a driver returns zero, the driver election
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* is cut short and that driver will attach to the device
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* immediately. This should rarely be used.
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*
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* For example, a probe method for a PCI device driver might look
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* like this:
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*
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* @code
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* int
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* foo_probe(device_t dev)
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* {
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* if (pci_get_vendor(dev) == FOOVENDOR &&
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* pci_get_device(dev) == FOODEVICE) {
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* device_set_desc(dev, "Foo device");
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* return (BUS_PROBE_DEFAULT);
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* }
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* return (ENXIO);
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* }
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* @endcode
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_probe, foo_probe)
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* @endcode
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*
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* @param dev the device to probe
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*
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* @retval 0 if this is the only possible driver for this
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* device
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* @retval negative if the driver can match this device - the
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* least negative value is used to select the
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* driver
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* @retval ENXIO if the driver does not match the device
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* @retval positive if some kind of error was detected during
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* the probe, a regular unix error code should
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* be returned to indicate the type of error
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* @see DEVICE_ATTACH(), pci_get_vendor(), pci_get_device()
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*/
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METHOD int probe {
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device_t dev;
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};
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/**
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* @brief Allow a device driver to detect devices not otherwise enumerated.
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*
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* The DEVICE_IDENTIFY() method is used by some drivers (e.g. the ISA
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* bus driver) to help populate the bus device with a useful set of
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* child devices, normally by calling the BUS_ADD_CHILD() method of
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* the parent device. For instance, the ISA bus driver uses several
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* special drivers, including the isahint driver and the pnp driver to
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* create child devices based on configuration hints and PnP bus
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* probes respectively.
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*
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* Many bus drivers which support true plug-and-play do not need to
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* use this method at all since child devices can be discovered
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* automatically without help from child drivers.
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_identify, foo_identify)
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* @endcode
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*
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* @param driver the driver whose identify method is being called
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* @param parent the parent device to use when adding new children
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*/
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STATICMETHOD void identify {
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driver_t *driver;
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device_t parent;
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};
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/**
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* @brief Attach a device to a device driver
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*
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* Normally only called via device_probe_and_attach(), this is called
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* when a driver has succeeded in probing against a device.
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* This method should initialise the hardware and allocate other
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* system resources (e.g. devfs entries) as required.
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_attach, foo_attach)
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* @endcode
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*
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* @param dev the device to probe
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*
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* @retval 0 success
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* @retval non-zero if some kind of error was detected during
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* the attach, a regular unix error code should
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* be returned to indicate the type of error
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* @see DEVICE_PROBE()
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*/
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METHOD int attach {
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device_t dev;
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};
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/**
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* @brief Detach a driver from a device.
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*
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* This can be called if the user is replacing the
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* driver software or if a device is about to be physically removed
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* from the system (e.g. for removable hardware such as USB or PCCARD).
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_detach, foo_detach)
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* @endcode
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*
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* @param dev the device to detach
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*
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* @retval 0 success
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* @retval non-zero the detach could not be performed, e.g. if the
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* driver does not support detaching.
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*
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* @see DEVICE_ATTACH()
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*/
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METHOD int detach {
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device_t dev;
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};
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/**
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* @brief Called during system shutdown.
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*
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* This method allows drivers to detect when the system is being shut down.
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* Some drivers need to use this to place their hardware in a consistent
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* state before rebooting the computer.
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_shutdown, foo_shutdown)
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* @endcode
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*/
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METHOD int shutdown {
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device_t dev;
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} DEFAULT null_shutdown;
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/**
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* @brief This is called by the power-management subsystem when a
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* suspend has been requested by the user or by some automatic
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* mechanism.
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*
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* This gives drivers a chance to veto the suspend or save their
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* configuration before power is removed.
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*
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* To include this method in a device driver, use a line like this in
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* the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_suspend, foo_suspend)
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* @endcode
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*
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* @param dev the device being suspended
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*
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* @retval 0 success
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* @retval non-zero an error occurred while attempting to prepare the
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* device for suspension
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*
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* @see DEVICE_RESUME()
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*/
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METHOD int suspend {
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device_t dev;
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} DEFAULT null_suspend;
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/**
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* @brief This is called when the system resumes after a suspend.
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_resume, foo_resume)
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* @endcode
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*
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* @param dev the device being resumed
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*
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* @retval 0 success
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* @retval non-zero an error occurred while attempting to restore the
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* device from suspension
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*
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* @see DEVICE_SUSPEND()
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*/
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METHOD int resume {
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device_t dev;
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} DEFAULT null_resume;
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/**
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* @brief This is called when the driver is asked to quiesce itself.
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*
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* The driver should arrange for the orderly shutdown of this device.
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* All further access to the device should be curtailed. Soon there
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* will be a request to detach, but there won't necessarily be one.
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*
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* To include this method in a device driver, use a line like this
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* in the driver's method list:
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*
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* @code
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* KOBJMETHOD(device_quiesce, foo_quiesce)
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* @endcode
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*
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* @param dev the device being quiesced
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*
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* @retval 0 success
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* @retval non-zero an error occurred while attempting to quiesce the
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* device
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*
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* @see DEVICE_DETACH()
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*/
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METHOD int quiesce {
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device_t dev;
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} DEFAULT null_quiesce;
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