linux-kernel - Re: Question: GPIO driver how to get irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 21 Apr 2011 10:09:14 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
CC:	linux-kernel@...r.kernel.org,
	'Grant Likely' <grant.likely@...retlab.ca>,
	toshiharu-linux@....okisemi.com
Subject: Re: Question: GPIO driver how to get irq_base

On 04/21/2011 09:32 AM, Tomoya MORINAGA wrote:
> Hi GPIO maintainer,
> 
> Need your help.
> I want to add interrupt function to gpio/pch_gpio.c
> 
> According to other upstreamed GPIO driver, (e.g. pl061, langwell, etc...)
> 2 IRQs(irq, irq_base) are used.
> 
> I can get "irq" from (struct pci_dev *)pdev->irq.
> However I can't understand where can I get the "irq_base".
> Let me know how to get.
> 
> Thanks,
> -----------------------------------------
> Tomoya MORINAGA
> OKI SEMICONDUCTOR CO., LTD.

In my opinion the best option for expander chips is to allocate a new irq_desc
range by calling irq_alloc_descs. It will return the first irq number in the
newly allocated range, which will be your irq_base.
But be aware that this will require SPARSE_IRQ to work.

- Lars
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/