linux-kernel - Re: [RFC, PATCH 1/3] gpiodev

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Message-Id: <200704110847.01107.schindele@nentec.de>
Date:	Wed, 11 Apr 2007 08:47:01 +0200
From:	Juergen Schindele <schindele@...tec.de>
To:	Paul Sokolovsky <pmiscml@...il.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC, PATCH 1/3] gpiodev - API definitions

Am Dienstag, 10. April 2007 23:30 schrieb Paul Sokolovsky:
> Hello linux-arm-kernel,
>
> GPIODEV API: Core API definitions. Provided are:
> 1. struct gpiodev_ops which must be included into platform_data structure
> of a device which will provide GPIODEV API; driver for a device must
> initialize this structure.
> 2. Structural definition of generalized GPIO identifier (struct gpio).
> 2. Set of API calls for clients. This fully follow Generic GPIO API
> naming and semantics, except that they have "gpiodev" prefix and
> accept struct gpio instead of integer gpio identifiers.
>
>
> Index: include/linux/gpiodev.h
> ===================================================================
> RCS file: include/linux/gpiodev.h
> diff -N include/linux/gpiodev.h
> --- /dev/null   1 Jan 1970 00:00:00 -0000
> +++ include/linux/gpiodev.h     10 Apr 2007 19:17:12 -0000      1.5
> @@ -0,0 +1,43 @@
> +#ifndef __GPIODEV_H
> +#define __GPIODEV_H
> +
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <asm/gpio.h>
> +
> +/* Interface */
> +
> +/* This structure must be first member of device platform_data structure
> +   of a device which provides gpiodev interface */
> +struct gpiodev_ops {
> +        int (*get)(struct device *this, int gpio_no);
> +        void (*set)(struct device *this, int gpio_no, int val);
> +        int (*to_irq)(struct device *this, int gpio_no);
> +};
> +
> +/* Generalized GPIO structure */
> +
> +struct gpio {
> +       struct platform_device *gpio_dev;
> +       int gpio_no;
> +};
> +
> +/* API functions */
> +
> +static inline int gpiodev_get_value(struct gpio *gpio)
> +{
> +       struct gpiodev_ops *ops = gpio->gpio_dev->dev.platform_data;

wouldn't it be more sure to verify if xxx function is NOT null
before using it ?? Perhaps something like that
	     BUG_ON(!ops->get);

> +       return ops->get(&gpio->gpio_dev->dev, gpio->gpio_no);
> +}
> +static inline void gpiodev_set_value(struct gpio *gpio, int val)
> +{
> +       struct gpiodev_ops *ops = gpio->gpio_dev->dev.platform_data;
> +       ops->set(&gpio->gpio_dev->dev, gpio->gpio_no, val);
> +}
> +static inline int gpiodev_to_irq(struct gpio *gpio)
> +{
> +       struct gpiodev_ops *ops = gpio->gpio_dev->dev.platform_data;
> +       return ops->to_irq(&gpio->gpio_dev->dev, gpio->gpio_no);
> +}
> +
> +#endif /* __GPIODEV_H */

-- 
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Jürgen Schindele  
Software-Entwicklung

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