Hi list,
I am referring linux-2.6.30/Documentation/hotplug.txt And I am not able
to follow below things.
[root@viral usb]# cat hotplug.txt
Most USB device drivers should pass these tables to the USB subsystem as
well as to the module management subsystem.
...
...
When the USB subsystem knows about a driver's device ID table, it's used
when
choosing drivers to probe(). The thread doing new device processing checks
drivers' device ID entries from the MODULE_DEVICE_TABLE against
interface and
device descriptors for the device.
===================
Now , my question is, usb_device_ids are a member of static structure
which is defined in class specific driver.
This is private variable to that module. How can usbcore access that
array of devices without loading that particular module ?
And my answer to this question is this is where modules.usbmap is used
and also when I connect USB device to my machine, some policy agents
reads modules.usbmap file and extracts information and must be calling
usbcore function. Then in turn usbcore will load/probe appropriate
device driver and NOT usbcore itself goes through list and decides about
which driver to load.
Please correct me if I am missing something.
--
Thanks,
Viral Mehta,
Embedded Software Engineer,
Tel. No. 91 79 26563705, Ext. 423
www.einfochips.com <http://www.einfochips.com>
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