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authorSebastian Huber <sebastian.huber@embedded-brains.de>2013-10-09 22:42:09 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2013-10-10 09:06:58 +0200
commitbceabc95c1c85d793200446fa85f1ddc6313ea29 (patch)
tree973c8bd8deca9fd69913f2895cc91e0e6114d46c /rtemsbsd/include/rtems/bsd/local/device_if.h
parentAdd FreeBSD sources as a submodule (diff)
downloadrtems-libbsd-bceabc95c1c85d793200446fa85f1ddc6313ea29.tar.bz2
Move files to match FreeBSD layout
Diffstat (limited to 'rtemsbsd/include/rtems/bsd/local/device_if.h')
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diff --git a/rtemsbsd/include/rtems/bsd/local/device_if.h b/rtemsbsd/include/rtems/bsd/local/device_if.h
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+/*
+ * This file is produced automatically.
+ * Do not modify anything in here by hand.
+ *
+ * Created from source file
+ * kern/device_if.m
+ * with
+ * makeobjops.awk
+ *
+ * See the source file for legal information
+ */
+
+/**
+ * @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.
+ * @{
+ */
+
+#ifndef _device_if_h_
+#define _device_if_h_
+
+/** @brief Unique descriptor for the DEVICE_PROBE() method */
+extern struct kobjop_desc device_probe_desc;
+/** @brief A function implementing the DEVICE_PROBE() method */
+typedef int device_probe_t(device_t dev);
+/**
+ * @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()
+ */
+
+static __inline int DEVICE_PROBE(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_probe);
+ return ((device_probe_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_IDENTIFY() method */
+extern struct kobjop_desc device_identify_desc;
+/** @brief A function implementing the DEVICE_IDENTIFY() method */
+typedef void device_identify_t(driver_t *driver, device_t parent);
+/**
+ * @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
+ * probes respectively.
+ *
+ * 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.
+ *
+ * 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
+ */
+
+static __inline void DEVICE_IDENTIFY(driver_t *driver, device_t parent)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(driver->ops,device_identify);
+ ((device_identify_t *) _m)(driver, parent);
+}
+
+/** @brief Unique descriptor for the DEVICE_ATTACH() method */
+extern struct kobjop_desc device_attach_desc;
+/** @brief A function implementing the DEVICE_ATTACH() method */
+typedef int device_attach_t(device_t dev);
+/**
+ * @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()
+ */
+
+static __inline int DEVICE_ATTACH(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_attach);
+ return ((device_attach_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_DETACH() method */
+extern struct kobjop_desc device_detach_desc;
+/** @brief A function implementing the DEVICE_DETACH() method */
+typedef int device_detach_t(device_t dev);
+/**
+ * @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()
+ */
+
+static __inline int DEVICE_DETACH(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_detach);
+ return ((device_detach_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_SHUTDOWN() method */
+extern struct kobjop_desc device_shutdown_desc;
+/** @brief A function implementing the DEVICE_SHUTDOWN() method */
+typedef int device_shutdown_t(device_t dev);
+/**
+ * @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
+ */
+
+static __inline int DEVICE_SHUTDOWN(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_shutdown);
+ return ((device_shutdown_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_SUSPEND() method */
+extern struct kobjop_desc device_suspend_desc;
+/** @brief A function implementing the DEVICE_SUSPEND() method */
+typedef int device_suspend_t(device_t dev);
+/**
+ * @brief This is called by the power-management subsystem when a
+ * suspend has been requested by the user or by some automatic
+ * mechanism.
+ *
+ * This gives drivers a chance to veto the suspend or save their
+ * configuration before power is removed.
+ *
+ * To include this method in a device driver, use a line like this in
+ * the driver's method list:
+ *
+ * @code
+ * KOBJMETHOD(device_suspend, foo_suspend)
+ * @endcode
+ *
+ * @param dev the device being suspended
+ *
+ * @retval 0 success
+ * @retval non-zero an error occurred while attempting to prepare the
+ * device for suspension
+ *
+ * @see DEVICE_RESUME()
+ */
+
+static __inline int DEVICE_SUSPEND(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_suspend);
+ return ((device_suspend_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_RESUME() method */
+extern struct kobjop_desc device_resume_desc;
+/** @brief A function implementing the DEVICE_RESUME() method */
+typedef int device_resume_t(device_t dev);
+/**
+ * @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
+ * @retval non-zero an error occurred while attempting to restore the
+ * device from suspension
+ *
+ * @see DEVICE_SUSPEND()
+ */
+
+static __inline int DEVICE_RESUME(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_resume);
+ return ((device_resume_t *) _m)(dev);
+}
+
+/** @brief Unique descriptor for the DEVICE_QUIESCE() method */
+extern struct kobjop_desc device_quiesce_desc;
+/** @brief A function implementing the DEVICE_QUIESCE() method */
+typedef int device_quiesce_t(device_t dev);
+/**
+ * @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()
+ */
+
+static __inline int DEVICE_QUIESCE(device_t dev)
+{
+ kobjop_t _m;
+ KOBJOPLOOKUP(((kobj_t)dev)->ops,device_quiesce);
+ return ((device_quiesce_t *) _m)(dev);
+}
+
+#endif /* _device_if_h_ */