SND_AC97_BUS(9) Control/Mixer API SND_AC97_BUS(9)NAME
snd_ac97_bus - create an AC97 bus component
SYNOPSIS
int snd_ac97_bus(struct snd_card * card, int num, struct snd_ac97_bus_ops * ops, void * private_data, struct snd_ac97_bus ** rbus);
ARGUMENTS
card
the card instance
num
the bus number
ops
the bus callbacks table
private_data
private data pointer for the new instance
rbus
the pointer to store the new AC97 bus instance.
DESCRIPTION
Creates an AC97 bus component. An struct snd_ac97_bus instance is newly allocated and initialized.
The ops table must include valid callbacks (at least read and write). The other callbacks, wait and reset, are not mandatory.
The clock is set to 48000. If another clock is needed, set (*rbus)->clock manually.
The AC97 bus instance is registered as a low-level device, so you don't have to release it manually.
Returns zero if successful, or a negative error code on failure.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SND_AC97_BUS(9)
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STRUCT BUS_TYPE(9) Device drivers infrastructure STRUCT BUS_TYPE(9)NAME
struct_bus_type - The bus type of the device
SYNOPSIS
struct bus_type {
const char * name;
const char * dev_name;
struct device * dev_root;
struct bus_attribute * bus_attrs;
struct device_attribute * dev_attrs;
struct driver_attribute * drv_attrs;
const struct attribute_group ** bus_groups;
const struct attribute_group ** dev_groups;
const struct attribute_group ** drv_groups;
int (* match) (struct device *dev, struct device_driver *drv);
int (* uevent) (struct device *dev, struct kobj_uevent_env *env);
int (* probe) (struct device *dev);
int (* remove) (struct device *dev);
void (* shutdown) (struct device *dev);
int (* online) (struct device *dev);
int (* offline) (struct device *dev);
int (* suspend) (struct device *dev, pm_message_t state);
int (* resume) (struct device *dev);
const struct dev_pm_ops * pm;
struct iommu_ops * iommu_ops;
struct subsys_private * p;
};
MEMBERS
name
The name of the bus.
dev_name
Used for subsystems to enumerate devices like ("foou", dev->id).
dev_root
Default device to use as the parent.
bus_attrs
Default attributes of the bus.
dev_attrs
Default attributes of the devices on the bus.
drv_attrs
Default attributes of the device drivers on the bus.
bus_groups
Default attributes of the bus.
dev_groups
Default attributes of the devices on the bus.
drv_groups
Default attributes of the device drivers on the bus.
match
Called, perhaps multiple times, whenever a new device or driver is added for this bus. It should return a nonzero value if the given
device can be handled by the given driver.
uevent
Called when a device is added, removed, or a few other things that generate uevents to add the environment variables.
probe
Called when a new device or driver add to this bus, and callback the specific driver's probe to initial the matched device.
remove
Called when a device removed from this bus.
shutdown
Called at shut-down time to quiesce the device.
online
Called to put the device back online (after offlining it).
offline
Called to put the device offline for hot-removal. May fail.
suspend
Called when a device on this bus wants to go to sleep mode.
resume
Called to bring a device on this bus out of sleep mode.
pm
Power management operations of this bus, callback the specific device driver's pm-ops.
iommu_ops
IOMMU specific operations for this bus, used to attach IOMMU driver implementations to a bus and allow the driver to do bus-specific
setup
p
The private data of the driver core, only the driver core can touch this.
DESCRIPTION
A bus is a channel between the processor and one or more devices. For the purposes of the device model, all devices are connected via a
bus, even if it is an internal, virtual, "platform" bus. Buses can plug into each other. A USB controller is usually a PCI device, for
example. The device model represents the actual connections between buses and the devices they control. A bus is represented by the
bus_type structure. It contains the name, the default attributes, the bus' methods, PM operations, and the driver core's private data.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 STRUCT BUS_TYPE(9)