linux-kernel - Re: [PATCH 1/3] gpiolib: add gpio_set

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Date:	Fri, 26 Feb 2010 18:39:44 -0500
From:	Andres Salomon <dilinger@...labora.co.uk>
To:	Ben Gardner <gardner.ben@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Jani Nikula <ext-jani.1.nikula@...ia.com>
Subject: Re: [PATCH 1/3] gpiolib: add gpio_set_direction()

On Fri, 26 Feb 2010 17:26:24 -0600
Ben Gardner <gardner.ben@...il.com> wrote:

> Combine gpio_direction_input() and gpio_direction_output() into
> gpio_set_direction().
> Add 'none' and 'inout' directions to the sysfs interface.
> 
> Signed-off-by: Ben Gardner <gardner.ben@...il.com>
> CC: Andres Salomon <dilinger@...labora.co.uk>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: David Brownell <dbrownell@...rs.sourceforge.net>
> CC: Jani Nikula <ext-jani.1.nikula@...ia.com>
> ---
>  drivers/gpio/gpiolib.c     |  123 ++++++++++++++++++++++----------------------
>  include/asm-generic/gpio.h |    6 ++
>  include/linux/gpio.h       |    5 ++
>  3 files changed, 73 insertions(+), 61 deletions(-)
> 
[...]
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> index 485eeb6..17c7642 100644
> --- a/include/asm-generic/gpio.h
> +++ b/include/asm-generic/gpio.h
> @@ -41,6 +41,8 @@ struct module;
>   *	enabling module power and clock; may sleep
>   * @free: optional hook for chip-specific deactivation, such as
>   *	disabling module power and clock; may sleep
> + * @set_direction: configures signal "offset" as "direction" (0-3, bit0=input,
> + *	bit1=output) or returns error


How about something like the following for set_direction, so we're not
comparing magic bits?

/* gpio direction flags */
#define GPIO_DIR_NONE 0 
#define	GPIO_DIR_INPUT (1 << 0)
#define	GPIO_DIR_OUTPUT (1 << 1)

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