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17 negative effect on kernel drivers, and to allow a gradual transition
20 In a nutshell, the driver model consists of a set of objects that can
39 - Define a struct bus_type for the bus driver::
60 as a module) by doing::
67 Other code may wish to reference the bus type, so declare it in a
93 struct device represents a single device. It mainly contains metadata
97 - Embed a struct device in the bus-specific device type::
144 Also, the location of the device's sysfs directory depends on a
145 device's parent. sysfs exports a directory structure that mirrors
149 The device's bus field is a pointer to the bus type the device
160 The release field is a callback that the driver model core calls
162 been released. More on this in a moment.
177 If a bus driver unregisters a device, it should not immediately free
185 When the device is registered, a directory in sysfs is created.
189 |-- 00:00.0
190 |-- 00:01.0
192 |-- 00:02.0
195 |-- 00:1e.0
197 |-- 00:1f.0
198 |-- 00:1f.1
204 |-- 00:1f.2
205 |-- 00:1f.3
206 `-- 00:1f.5
212 |-- 00:00.0 -> ../../../devices/pci0/00:00.0
213 |-- 00:01.0 -> ../../../devices/pci0/00:01.0
214 |-- 00:02.0 -> ../../../devices/pci0/00:02.0
215 |-- 00:1e.0 -> ../../../devices/pci0/00:1e.0
216 |-- 00:1f.0 -> ../../../devices/pci0/00:1f.0
217 |-- 00:1f.1 -> ../../../devices/pci0/00:1f.1
218 |-- 00:1f.2 -> ../../../devices/pci0/00:1f.2
219 |-- 00:1f.3 -> ../../../devices/pci0/00:1f.3
220 |-- 00:1f.5 -> ../../../devices/pci0/00:1f.5
221 |-- 01:00.0 -> ../../../devices/pci0/00:01.0/01:00.0
222 |-- 02:1f.0 -> ../../../devices/pci0/00:02.0/02:1f.0
223 |-- 03:00.0 -> ../../../devices/pci0/00:02.0/02:1f.0/03:00.0
224 `-- 04:04.0 -> ../../../devices/pci0/00:1e.0/04:04.0
230 struct device_driver is a simple driver structure that contains a set
234 - Embed a struct device_driver in the bus-specific driver.
283 struct device_driver defines a set of operations that the driver model
288 It would be difficult and tedious to force every driver on a bus to
330 The model assumes that a device or driver can be dynamically
332 devices must be bound to a driver, or drivers must be bound to all
335 A driver typically contains a list of device IDs that it supports. The
340 Instead, a bus may supply a method in struct bus_type that does the
350 When a device is registered, the bus's list of drivers is iterated
351 over. bus->match() is called for each one until a match is found.
353 When a driver is registered, the bus's list of devices is iterated
355 claimed by a driver.
357 When a device is successfully bound to a driver, device->driver is
358 set, the device is added to a per-driver list of devices, and a
364 | `-- 00:0b.0 -> ../../../../devices/pci0/00:0b.0
367 | `-- 00:00.0 -> ../../../../devices/pci0/00:00.0
369 | `-- 00:0c.0 -> ../../../../devices/pci0/00:0c.0
377 Step 6: Supply a hotplug callback.
379 Whenever a device is registered with the driver model core, the
381 Users can define actions to perform when a device is inserted or
390 A bus driver may also supply additional parameters for userspace to
391 consume. To do this, a bus must implement the 'hotplug' method in
407 struct bus_type contains a list of all devices registered with the bus
420 struct bus_type also contains a list of all drivers registered with