linux-kernel - Re: [PATCH] pio: add arch specific gpio_is

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:	Tue, 7 Sep 2010 21:13:12 +0200
From:	"avictor.za@...il.com" <avictor.za@...il.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Eric Miao <eric.y.miao@...il.com>,
	Ryan Mallon <ryan@...ewatersys.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, bn@...sdigital.com,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pio: add arch specific gpio_is_valid() function

hi,

> NAK still.  You're trying to abuse gpio_is_valid(),
> which I see no need to support.
>
> In terms of GPIO framework architecture, zero is
> the first GPIO in all cases, and is always
> a valid GPIO number, even if it's not
> requestable/swritable/readable on a given board.
>
> Whether it's usable on a given platform depends
> on whether a GPIO controller is registered which
> claims numbers 0..N ... (assuming gpiolib in use).

How should the following be done in a driver then?

   if (gpio_is_valid(device->output_pin)) {
         if (gpio_request(device->output_pin, "driverX") != 0)
             goto error_handling;

         /* continue with gpio setup */
    }
    else {
        /* there is no vcc_pin, so don't do any gpio setup */
    }

    ....

   if (gpio_is_valid(device->output_pin)) {
       /* set value high */
   }


Regards,
  Andrew Victor
--
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/