1STRUCT BUS_TYPE(9)       Device drivers infrastructure      STRUCT BUS_TYPE(9)
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NAME

6       struct_bus_type - The bus type of the device
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SYNOPSIS

9       struct bus_type {
10         const char * name;
11         const char * dev_name;
12         struct device * dev_root;
13         struct bus_attribute * bus_attrs;
14         struct device_attribute * dev_attrs;
15         struct driver_attribute * drv_attrs;
16         const struct attribute_group ** bus_groups;
17         const struct attribute_group ** dev_groups;
18         const struct attribute_group ** drv_groups;
19         int (* match) (struct device *dev, struct device_driver *drv);
20         int (* uevent) (struct device *dev, struct kobj_uevent_env *env);
21         int (* probe) (struct device *dev);
22         int (* remove) (struct device *dev);
23         void (* shutdown) (struct device *dev);
24         int (* online) (struct device *dev);
25         int (* offline) (struct device *dev);
26         int (* suspend) (struct device *dev, pm_message_t state);
27         int (* resume) (struct device *dev);
28         const struct dev_pm_ops * pm;
29         struct iommu_ops * iommu_ops;
30         struct subsys_private * p;
31       };
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MEMBERS

34       name
35           The name of the bus.
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37       dev_name
38           Used for subsystems to enumerate devices like (“foou”, dev->id).
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40       dev_root
41           Default device to use as the parent.
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43       bus_attrs
44           Default attributes of the bus.
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46       dev_attrs
47           Default attributes of the devices on the bus.
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49       drv_attrs
50           Default attributes of the device drivers on the bus.
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52       bus_groups
53           Default attributes of the bus.
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55       dev_groups
56           Default attributes of the devices on the bus.
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58       drv_groups
59           Default attributes of the device drivers on the bus.
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61       match
62           Called, perhaps multiple times, whenever a new device or driver is
63           added for this bus. It should return a nonzero value if the given
64           device can be handled by the given driver.
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66       uevent
67           Called when a device is added, removed, or a few other things that
68           generate uevents to add the environment variables.
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70       probe
71           Called when a new device or driver add to this bus, and callback
72           the specific driver's probe to initial the matched device.
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74       remove
75           Called when a device removed from this bus.
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77       shutdown
78           Called at shut-down time to quiesce the device.
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80       online
81           Called to put the device back online (after offlining it).
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83       offline
84           Called to put the device offline for hot-removal. May fail.
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86       suspend
87           Called when a device on this bus wants to go to sleep mode.
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89       resume
90           Called to bring a device on this bus out of sleep mode.
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92       pm
93           Power management operations of this bus, callback the specific
94           device driver's pm-ops.
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96       iommu_ops
97           IOMMU specific operations for this bus, used to attach IOMMU driver
98           implementations to a bus and allow the driver to do bus-specific
99           setup
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101       p
102           The private data of the driver core, only the driver core can touch
103           this.
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DESCRIPTION

106       A bus is a channel between the processor and one or more devices. For
107       the purposes of the device model, all devices are connected via a bus,
108       even if it is an internal, virtual, “platform” bus. Buses can plug into
109       each other. A USB controller is usually a PCI device, for example. The
110       device model represents the actual connections between buses and the
111       devices they control. A bus is represented by the bus_type structure.
112       It contains the name, the default attributes, the bus' methods, PM
113       operations, and the driver core's private data.
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116Kernel Hackers Manual 3.10         June 2019                STRUCT BUS_TYPE(9)
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