1998-06-14 13:53:12 +00:00
|
|
|
#
|
2004-08-12 17:26:22 +00:00
|
|
|
# Copyright (c) 1998-2004 Doug Rabson
|
1998-06-14 13:53:12 +00:00
|
|
|
# All rights reserved.
|
|
|
|
#
|
|
|
|
# Redistribution and use in source and binary forms, with or without
|
|
|
|
# modification, are permitted provided that the following conditions
|
|
|
|
# are met:
|
|
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
|
|
# notice, this list of conditions and the following disclaimer.
|
|
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
|
|
# documentation and/or other materials provided with the distribution.
|
|
|
|
#
|
|
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
# SUCH DAMAGE.
|
|
|
|
#
|
1999-08-28 01:08:13 +00:00
|
|
|
# $FreeBSD$
|
1998-06-14 13:53:12 +00:00
|
|
|
#
|
|
|
|
|
2000-04-08 14:17:18 +00:00
|
|
|
#include <sys/bus.h>
|
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
|
|
|
* @defgroup DEVICE device - KObj methods for all device drivers
|
|
|
|
* @brief A basic set of methods required for all device drivers.
|
|
|
|
*
|
|
|
|
* The device interface is used to match devices to drivers during
|
|
|
|
* autoconfiguration and provides methods to allow drivers to handle
|
|
|
|
* system-wide events such as suspend, resume or shutdown.
|
|
|
|
* @{
|
|
|
|
*/
|
1998-11-08 18:35:53 +00:00
|
|
|
INTERFACE device;
|
1998-06-14 13:53:12 +00:00
|
|
|
|
1999-05-10 17:06:14 +00:00
|
|
|
#
|
|
|
|
# Default implementations of some methods.
|
|
|
|
#
|
|
|
|
CODE {
|
|
|
|
static int null_shutdown(device_t dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int null_suspend(device_t dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int null_resume(device_t dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
2004-12-31 20:47:51 +00:00
|
|
|
|
|
|
|
static int null_quiesce(device_t dev)
|
|
|
|
{
|
|
|
|
return EOPNOTSUPP;
|
|
|
|
}
|
1999-05-10 17:06:14 +00:00
|
|
|
};
|
2004-07-11 16:17:42 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Probe to see if a device matches a driver.
|
|
|
|
*
|
|
|
|
* Users should not call this method directly. Normally, this
|
|
|
|
* is called via device_probe_and_attach() to select a driver
|
|
|
|
* calling the DEVICE_PROBE() of all candidate drivers and attach
|
|
|
|
* the winning driver (if any) to the device.
|
|
|
|
*
|
|
|
|
* This function is used to match devices to device drivers.
|
|
|
|
* Typically, the driver will examine the device to see if
|
|
|
|
* it is suitable for this driver. This might include checking
|
|
|
|
* the values of various device instance variables or reading
|
|
|
|
* hardware registers.
|
|
|
|
*
|
|
|
|
* In some cases, there may be more than one driver available
|
|
|
|
* which can be used for a device (for instance there might
|
|
|
|
* be a generic driver which works for a set of many types of
|
|
|
|
* device and a more specific driver which works for a subset
|
|
|
|
* of devices). Because of this, a driver should not assume
|
|
|
|
* that it will be the driver that attaches to the device even
|
|
|
|
* if it returns a success status from DEVICE_PROBE(). In particular,
|
|
|
|
* a driver must free any resources which it allocated during
|
|
|
|
* the probe before returning. The return value of DEVICE_PROBE()
|
|
|
|
* is used to elect which driver is used - the driver which returns
|
|
|
|
* the largest non-error value wins the election and attaches to
|
|
|
|
* the device.
|
|
|
|
*
|
|
|
|
* If a driver matches the hardware, it should set the device
|
|
|
|
* description string using device_set_desc() or
|
|
|
|
* device_set_desc_copy(). This string is
|
|
|
|
* used to generate an informative message when DEVICE_ATTACH()
|
|
|
|
* is called.
|
|
|
|
*
|
|
|
|
* As a special case, if a driver returns zero, the driver election
|
|
|
|
* is cut short and that driver will attach to the device
|
|
|
|
* immediately.
|
|
|
|
*
|
|
|
|
* For example, a probe method for a pci device driver might look
|
|
|
|
* like this:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* int foo_probe(device_t dev)
|
|
|
|
* {
|
|
|
|
* if (pci_get_vendor(dev) == FOOVENDOR &&
|
|
|
|
* pci_get_device(dev) == FOODEVICE) {
|
|
|
|
* device_set_desc(dev, "Foo device");
|
|
|
|
* return (0);
|
|
|
|
* }
|
|
|
|
* return (ENXIO);
|
|
|
|
* }
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_probe, foo_probe)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device to probe
|
|
|
|
*
|
|
|
|
* @retval 0 if the driver strongly matches this device
|
|
|
|
* @retval negative if the driver can match this device - the
|
|
|
|
* least negative value is used to select the
|
|
|
|
* driver
|
|
|
|
* @retval ENXIO if the driver does not match the device
|
|
|
|
* @retval positive if some kind of error was detected during
|
|
|
|
* the probe, a regular unix error code should
|
|
|
|
* be returned to indicate the type of error
|
|
|
|
* @see DEVICE_ATTACH(), pci_get_vendor(), pci_get_device()
|
|
|
|
*/
|
1998-06-14 13:53:12 +00:00
|
|
|
METHOD int probe {
|
|
|
|
device_t dev;
|
|
|
|
};
|
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
2004-08-12 17:26:22 +00:00
|
|
|
* @brief Allow a device driver to detect devices not otherwise enumerated.
|
|
|
|
*
|
|
|
|
* The DEVICE_IDENTIFY() method is used by some drivers (e.g. the ISA
|
|
|
|
* bus driver) to help populate the bus device with a useful set of
|
|
|
|
* child devices, normally by calling the BUS_ADD_CHILD() method of
|
|
|
|
* the parent device. For instance, the ISA bus driver uses several
|
|
|
|
* special drivers, including the isahint driver and the pnp driver to
|
|
|
|
* create child devices based on configuration hints and PnP bus
|
2004-07-11 16:17:42 +00:00
|
|
|
* probes respectively.
|
|
|
|
*
|
2004-08-12 17:26:22 +00:00
|
|
|
* Many bus drivers which support true plug-and-play do not need to
|
|
|
|
* use this method at all since child devices can be discovered
|
|
|
|
* automatically without help from child drivers.
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_identify, foo_identify)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param driver the driver whose identify method is being called
|
|
|
|
* @param parent the parent device to use when adding new children
|
|
|
|
*/
|
1999-05-14 11:22:47 +00:00
|
|
|
STATICMETHOD void identify {
|
|
|
|
driver_t *driver;
|
|
|
|
device_t parent;
|
|
|
|
};
|
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
|
|
|
* @brief Attach a device to a device driver
|
|
|
|
*
|
|
|
|
* Normally only called via device_probe_and_attach(), this is called
|
|
|
|
* when a driver has succeeded in probing against a device.
|
|
|
|
* This method should initialise the hardware and allocate other
|
|
|
|
* system resources (e.g. devfs entries) as required.
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_attach, foo_attach)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device to probe
|
|
|
|
*
|
|
|
|
* @retval 0 success
|
|
|
|
* @retval non-zero if some kind of error was detected during
|
|
|
|
* the attach, a regular unix error code should
|
|
|
|
* be returned to indicate the type of error
|
|
|
|
* @see DEVICE_PROBE()
|
|
|
|
*/
|
1998-06-14 13:53:12 +00:00
|
|
|
METHOD int attach {
|
|
|
|
device_t dev;
|
|
|
|
};
|
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
|
|
|
* @brief Detach a driver from a device.
|
|
|
|
*
|
|
|
|
* This can be called if the user is replacing the
|
|
|
|
* driver software or if a device is about to be physically removed
|
|
|
|
* from the system (e.g. for removable hardware such as USB or PCCARD).
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_detach, foo_detach)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device to detach
|
|
|
|
*
|
|
|
|
* @retval 0 success
|
|
|
|
* @retval non-zero the detach could not be performed, e.g. if the
|
|
|
|
* driver does not support detaching.
|
|
|
|
*
|
|
|
|
* @see DEVICE_ATTACH()
|
|
|
|
*/
|
1998-06-14 13:53:12 +00:00
|
|
|
METHOD int detach {
|
|
|
|
device_t dev;
|
|
|
|
};
|
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
|
|
|
* @brief Called during system shutdown.
|
|
|
|
*
|
|
|
|
* This method allows drivers to detect when the system is being shut down.
|
|
|
|
* Some drivers need to use this to place their hardware in a consistent
|
|
|
|
* state before rebooting the computer.
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_shutdown, foo_shutdown)
|
|
|
|
* @endcode
|
|
|
|
*/
|
1998-06-14 13:53:12 +00:00
|
|
|
METHOD int shutdown {
|
|
|
|
device_t dev;
|
1999-05-10 17:06:14 +00:00
|
|
|
} DEFAULT null_shutdown;
|
1998-11-14 21:58:51 +00:00
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
2004-08-12 17:26:22 +00:00
|
|
|
* @brief This is called by the power-management subsystem when a
|
|
|
|
* suspend has been requested by the user or by some automatic
|
|
|
|
* mechanism.
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
2004-08-12 17:26:22 +00:00
|
|
|
* This gives drivers a chance to veto the suspend or save their
|
|
|
|
* configuration before power is removed.
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
2004-08-12 17:26:22 +00:00
|
|
|
* To include this method in a device driver, use a line like this in
|
|
|
|
* the driver's method list:
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_suspend, foo_suspend)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device being suspended
|
|
|
|
*
|
|
|
|
* @retval 0 success
|
2004-08-12 17:26:22 +00:00
|
|
|
* @retval non-zero an error occurred while attempting to prepare the
|
|
|
|
* device for suspension
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
|
|
|
* @see DEVICE_RESUME()
|
|
|
|
*/
|
1998-11-14 21:58:51 +00:00
|
|
|
METHOD int suspend {
|
|
|
|
device_t dev;
|
1999-05-10 17:06:14 +00:00
|
|
|
} DEFAULT null_suspend;
|
1998-11-14 21:58:51 +00:00
|
|
|
|
2004-07-11 16:17:42 +00:00
|
|
|
/**
|
|
|
|
* @brief This is called when the system resumes after a suspend.
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_resume, foo_resume)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device being resumed
|
|
|
|
*
|
|
|
|
* @retval 0 success
|
2004-08-12 17:26:22 +00:00
|
|
|
* @retval non-zero an error occurred while attempting to restore the
|
|
|
|
* device from suspension
|
2004-07-11 16:17:42 +00:00
|
|
|
*
|
|
|
|
* @see DEVICE_SUSPEND()
|
|
|
|
*/
|
1998-11-14 21:58:51 +00:00
|
|
|
METHOD int resume {
|
|
|
|
device_t dev;
|
1999-05-10 17:06:14 +00:00
|
|
|
} DEFAULT null_resume;
|
2004-12-31 20:47:51 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief This is called when the driver is asked to quiesce itself.
|
|
|
|
*
|
|
|
|
* The driver should arrange for the orderly shutdown of this device.
|
|
|
|
* All further access to the device should be curtailed. Soon there
|
|
|
|
* will be a request to detach, but there won't necessarily be one.
|
|
|
|
*
|
|
|
|
* To include this method in a device driver, use a line like this
|
|
|
|
* in the driver's method list:
|
|
|
|
*
|
|
|
|
* @code
|
|
|
|
* KOBJMETHOD(device_quiesce, foo_quiesce)
|
|
|
|
* @endcode
|
|
|
|
*
|
|
|
|
* @param dev the device being quiesced
|
|
|
|
*
|
|
|
|
* @retval 0 success
|
|
|
|
* @retval non-zero an error occurred while attempting to quiesce the
|
|
|
|
* device
|
|
|
|
*
|
|
|
|
* @see DEVICE_DETACH()
|
|
|
|
*/
|
|
|
|
METHOD int quiesce {
|
|
|
|
device_t dev;
|
|
|
|
} DEFAULT null_quiesce;
|