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-rw-r--r--Documentation/driver-model/device.txt91
1 files changed, 1 insertions, 90 deletions
diff --git a/Documentation/driver-model/device.txt b/Documentation/driver-model/device.txt
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--- a/Documentation/driver-model/device.txt
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@@ -2,96 +2,7 @@
2The Basic Device Structure 2The Basic Device Structure
3~~~~~~~~~~~~~~~~~~~~~~~~~~ 3~~~~~~~~~~~~~~~~~~~~~~~~~~
4 4
5struct device { 5See the kerneldoc for the struct device.
6 struct list_head g_list;
7 struct list_head node;
8 struct list_head bus_list;
9 struct list_head driver_list;
10 struct list_head intf_list;
11 struct list_head children;
12 struct device * parent;
13
14 char name[DEVICE_NAME_SIZE];
15 char bus_id[BUS_ID_SIZE];
16
17 spinlock_t lock;
18 atomic_t refcount;
19
20 struct bus_type * bus;
21 struct driver_dir_entry dir;
22
23 u32 class_num;
24
25 struct device_driver *driver;
26 void *driver_data;
27 void *platform_data;
28
29 u32 current_state;
30 unsigned char *saved_state;
31
32 void (*release)(struct device * dev);
33};
34
35Fields
36~~~~~~
37g_list: Node in the global device list.
38
39node: Node in device's parent's children list.
40
41bus_list: Node in device's bus's devices list.
42
43driver_list: Node in device's driver's devices list.
44
45intf_list: List of intf_data. There is one structure allocated for
46 each interface that the device supports.
47
48children: List of child devices.
49
50parent: *** FIXME ***
51
52name: ASCII description of device.
53 Example: " 3Com Corporation 3c905 100BaseTX [Boomerang]"
54
55bus_id: ASCII representation of device's bus position. This
56 field should be a name unique across all devices on the
57 bus type the device belongs to.
58
59 Example: PCI bus_ids are in the form of
60 <bus number>:<slot number>.<function number>
61 This name is unique across all PCI devices in the system.
62
63lock: Spinlock for the device.
64
65refcount: Reference count on the device.
66
67bus: Pointer to struct bus_type that device belongs to.
68
69dir: Device's sysfs directory.
70
71class_num: Class-enumerated value of the device.
72
73driver: Pointer to struct device_driver that controls the device.
74
75driver_data: Driver-specific data.
76
77platform_data: Platform data specific to the device.
78
79 Example: for devices on custom boards, as typical of embedded
80 and SOC based hardware, Linux often uses platform_data to point
81 to board-specific structures describing devices and how they
82 are wired. That can include what ports are available, chip
83 variants, which GPIO pins act in what additional roles, and so
84 on. This shrinks the "Board Support Packages" (BSPs) and
85 minimizes board-specific #ifdefs in drivers.
86
87current_state: Current power state of the device.
88
89saved_state: Pointer to saved state of the device. This is usable by
90 the device driver controlling the device.
91
92release: Callback to free the device after all references have
93 gone away. This should be set by the allocator of the
94 device (i.e. the bus driver that discovered the device).
95 6
96 7
97Programming Interface 8Programming Interface