lkml.org 
[lkml]   [2000]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Sample device driver - 2.2 and 2.4 support?
Richard A Nelson wrote:
> I've been assigned a device driver that uses the old (2.0) PCI
> support APIs - and is still working on 2.2.
>
> I need to get this driver working on 2.2 and 2.4, I'm assuming I'll
> need to go switch to the newer PCI stuff - but am curious about the
> toleration support in later 2.2 kernels; is it complete enough that
> I can migrate to 2.4, and still compile on 2.2?

You can still use the 2.0.x PCI functions on 2.4.x. They are slower
than the 'struct pci_dev' versions of the functions, because each
pcibios_xxx call incurs a call to pci_find_slot().
>
> The device:
> 1-2 DMA
> 1 IRQ
>
> The driver:
> mkalloc
> __get_free_pages
> virt_to_bus
> request_irc
> wake_up
>
> The driver has similiar functionality to a sound card:
> Send/Receive (possibly large) data to device via DMA (page fixing, etc)
>
> Is there a cononical example (esp. wrt 2.2 <-> 2.4 changes) I should look
> at ?

That depends on both the changes and your driver... Every driver is
different, so nothing is really canonical WRT driver API changes. If
your driver is similar to a sound card, then look at drivers/sound/*.c
...

Jeff


--
Jeff Garzik | Dinner is ready when
Building 1024 | the smoke alarm goes off.
MandrakeSoft | -/usr/games/fortune
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.065 / U:0.224 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site