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o Add cautions about multiple adds of the device

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o Remove setting the description of the device (that is more properly done in
  probe).
o Remove setting the driver, as it is unnecessary
o Add pseudo code to ensure that the device isn't added to the tree already.
o remove some now unreferenced routines
This commit is contained in:
imp 2004-05-13 20:31:05 +00:00
parent e63bc99425
commit 8bae5ad135
1 changed files with 5 additions and 8 deletions
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13
share/man/man9/DEVICE_IDENTIFY.9
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@ -28,7 +28,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd March 10, 2001
.Dd May 13, 2004
.Dt DEVICE_IDENTIFY 9
.Os
.Sh NAME
@ -60,12 +60,12 @@ Since the device tree and the device driver tree are disjoint, the
routine needs to take this into account.
If you load and unload your device driver that has the identify
routine, the child node has the potential for adding the same node
multiple times.
multiple times unless specific measure are taken to preclude that
possibility.
.Sh EXAMPLES
The following pseudo-code shows an example of a function that
probes for a piece of hardware and registers it and its resource
(an I/O port) with the kernel.
It also sets the description of the device.
.Bd -literal
void
foo_identify(driver_t *driver, device_t parent)
@ -73,10 +73,9 @@ foo_identify(driver_t *driver, device_t parent)
device_t child;
retrieve_device_information;
if (devices matches one of your supported devices) {
if (devices matches one of your supported devices &&
not already in device tree) {
child = BUS_ADD_CHILD(parent, 0, "foo", -1);
device_set_desc_copy(child, "foo chip ver.123");
device_set_driver(child, driver);
bus_set_resource(child, SYS_RES_IOPORT, 0, FOO_IOADDR, 1);
}
}
@ -89,8 +88,6 @@ foo_identify(driver_t *driver, device_t parent)
.Xr DEVICE_ATTACH 9 ,
.Xr DEVICE_DETACH 9 ,
.Xr DEVICE_PROBE 9 ,
.Xr device_set_desc_copy 9 ,
.Xr device_set_driver 9 ,
.Xr DEVICE_SHUTDOWN 9
.Sh AUTHORS
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